WO2010050102A1 - Wireless communication system, receiver apparatus, transmitter apparatus, reception control method, transmission control method, reception control program, and transmission control program - Google Patents

Abstract

A control channel decoding unit (b122) of a local apparatus carries out decoding of control information addressed to the local apparatus if a control information indicator that indicates the presence of such control information is detected.  Otherwise, the control channel decoding unit carries out no decoding of control information.

Description

Wireless communication system, receiver, transmitter, reception control method, transmission control method, reception control program, and transmission control program

The present invention relates to a wireless communication system, a reception device, a transmission device, a reception control method, a transmission control method, a reception control program, and a transmission control program.
This application claims priority based on Japanese Patent Application No. 2008-278516 filed in Japan on October 29, 2008, the contents of which are incorporated herein by reference.

As a third generation (3G) radio access method for cellular mobile communication, W-CDMA (Wideband Code Division Multiple Access) method has been standardized in 3GPP (3rd Generation Partnership Project; 3rd Generation Partnership Project). A cellular mobile communication service based on this method has been started. In 3GPP, 3G evolution (Evolved Universal Terrestrial Radio Access; hereinafter referred to as “EUTRA”) and 3G network evolution (Evolved Universal Terrestrial Access Network are being studied).

As an EUTRA downlink, an OFDM (Orthogonal Frequency Division Multiplexing) scheme, which is multicarrier transmission, has been proposed. Further, as an uplink of EUTRA, a single carrier communication method of DFT (Discrete Fourier Transform) -Spread OFDM method which is single carrier transmission has been proposed.

Hereinafter, the communication technology of the downlink control channel in the downlink of EUTRA will be described.
FIG. 25 is a diagram illustrating a schematic configuration of a downlink radio frame in EUTRA. In this figure, the horizontal axis represents the time domain, and the vertical axis represents the frequency domain. The downlink radio frame is a unit such as radio resource allocation, and is composed of a PRB (Physical Resource Block) pair consisting of a frequency band and a time band of a predetermined width. One physical resource block PRB pair is composed of two physical resource blocks PRB that are continuous in the time domain.

One physical resource block PRB is composed of 12 subcarriers in the frequency domain, and is composed of 7 OFDM symbols in the time domain. The system bandwidth is a communication bandwidth of the base station device. In the time domain, there are a slot composed of 7 OFDM symbols, a subframe composed of 2 slots, and a radio frame composed of 10 subframes. A unit composed of one subcarrier and one OFDM symbol is called a resource element. In the downlink radio frame, a plurality of physical resource blocks PRB are arranged according to the system bandwidth.

In each subframe, at least a downlink shared data channel used for transmitting information data and a downlink control channel used for transmitting control data are arranged. Although not shown in this figure, downlink pilot channels used for channel estimation of the downlink shared data channel and the downlink control channel are distributed and arranged in a plurality of resource elements. In this figure, the downlink control channel is arranged in the first, second and third OFDM symbols of the subframe, and the downlink shared data channel is arranged in other OFDM symbols. The OFDM symbol in which the control channel is arranged varies in subframe units.

Although not shown in this figure, a control format indicator channel indicating the number of OFDM symbols constituting the downlink control channel is arranged in the first OFDM symbol, and the downlink control channel is the first OFDM symbol. Or only in the first and second OFDM symbols. Also, the downlink control channel and the downlink shared data channel are not arranged together in the same OFDM symbol. In the downlink control channel, a mobile station identifier or a mobile station group identifier, radio resource allocation information of the downlink shared data channel, multi-antenna related information, a modulation scheme, a coding rate, a retransmission parameter, and the like are arranged.

As shown in FIG. 26, the downlink control channel is configured by a plurality of control channel elements (CCE: Control Channel Element). The number of control channel elements depends on the number of downlink pilot channels according to the system bandwidth, the number of OFDM symbols constituting the downlink control channel, and the number of transmission antennas of the base station apparatus used for communication. As will be described later, the control channel element includes a plurality of resource elements.
FIG. 26 is a diagram for explaining a logical relationship between a control channel element and a downlink control channel in EUTRA. Here, CCE t indicates a control channel element having a control channel element index t. The control channel element index is a number that identifies the control channel element.

The downlink control channel is configured by a set of a plurality of control channel elements. The number of control channel elements constituting this set is hereinafter referred to as “CCE aggregation number” (CCE aggregation number). The number of CCE sets constituting the downlink control channel is determined according to the coding rate and the amount of control data. In addition, a set of n control channel elements is hereinafter referred to as “CCE set n”. For example, a downlink control channel is configured by one control channel element (CCE set 1), a downlink control channel is configured by two control channel elements (CCE set 2), and four control channel elements Thus, a downlink control channel is configured (CCE set 4), or a downlink control channel is configured by 8 control channel elements (CCE set 8).

As shown in FIG. 27, the control channel element includes a plurality of resource element groups (also referred to as mini-CCE).
FIG. 27 is a diagram for explaining an arrangement example of resource element groups in a downlink radio frame in EUTRA. Here, a case is shown in which the downlink control channel is composed of the first to third OFDM symbols, and downlink pilot channels of two transmission antennas (transmission antenna 1 and transmission antenna 2) are arranged. In this figure, the horizontal axis represents the frequency domain, and the vertical axis represents the time domain.

In the arrangement example in this figure, one resource element group is composed of four resource elements adjacent in the frequency domain. In this figure, resource elements to which the same reference numerals of downlink control channels are assigned belong to the same resource element group. Note that resource element R1 (downlink pilot channel signal of transmission antenna 1) and R2 (downlink pilot channel signal of transmission antenna 2) in which the downlink pilot channel is arranged are skipped to form a resource element group.

In this figure, the resource element group of the first OFDM symbol having the lowest frequency is numbered (reference numeral “1”), and then the resource element group of the second OFDM symbol having the lowest frequency is numbered. (Symbol “2”) is performed, and then the resource element group of the third OFDM symbol having the lowest frequency is numbered (symbol “3”).

This figure also shows the numbering of the resource element groups adjacent to the frequency of the resource element group where the numbering (symbol “2”) of the second OFDM symbol in which the downlink pilot channel is not arranged next is performed (symbol “ 4 ”), and the number of the adjacent resource element group of the frequency of the resource element group to which the numbering (symbol“ 3 ”) of the third OFDM symbol in which the downlink pilot channel is not allocated is performed (symbol) “5”) is performed.
Further, in this figure, the resource element group adjacent to the frequency of the resource element group to which the first OFDM symbol is numbered (symbol “1”) is numbered (symbol “6”). Next, the resource element group adjacent to the frequency of the resource element group on which the second OFDM symbol is numbered (symbol “4”) is numbered (symbol “7”), and then the third OFDM symbol is numbered. This indicates that numbering (symbol “8”) is performed on the resource element group adjacent to the frequency of the resource element group on which symbol numbering (symbol “5”) is performed. Subsequent numbering is performed for the resource element groups of the physical resource block PRB pair.

The control channel element is composed of a plurality of resource element groups configured as shown in this figure. For example, one control channel element is composed of nine different resource element groups distributed in the frequency domain and the time domain. Specifically, for the entire system bandwidth, all resource element groups numbered as shown in this figure are interleaved in units of resource element groups using a block interleaver. One control channel element is configured by nine consecutive resource element groups.

Here, in EUTRA, each of a plurality of control data arranged in the downlink control channel has a format. Hereinafter, the format of the control data arranged in the downlink control channel is referred to as “control data format (Downlink Control Information format)”.

The control data format includes DCI format 1, which is used for radio resource allocation of the downlink shared data channel of the normal mobile station device, radio resource allocation of the downlink shared data channel of the mobile station device with a small amount of data or high speed movement. DCI format 1A used for communication, multiple DCI format 1B used for radio resource allocation of downlink shared data channel to which beamforming is applied using multiple antennas, multiple mobile stations with high data volume and good reception quality DCI format 2 used for radio resource allocation of downlink shared data channel to which spatial multiplexing is applied using an antenna, DCI used for radio resource allocation of uplink shared data channel of mobile station apparatus format 0, and the like.

In EUTRA, the base station apparatus notifies the mobile station apparatus of a control data format of control data used for communication with the mobile station apparatus at the start of communication connection. In the communication between the base station device and the mobile station device, a plurality of control data are transmitted and received, so the base station device notifies the mobile station device of a plurality of control data formats.
For example, the base station apparatus notifies DCI format 0, DCI format 1A, and DCI format 1 to a certain mobile station apparatus. Also, the base station apparatus notifies DCI format 0, DCI format 1A, and DCI format 2 to a certain mobile station apparatus, and DCI format 0 and DCI format 1A to other mobile station apparatuses. Notify DCI format 1B.

Hereinafter, the decoding process of the downlink control channel signal in the mobile station apparatus will be described.
For each of a plurality of control data formats notified in advance from the base station apparatus, the mobile station apparatus detects downlink control channel data for each data amount of the control data, and performs decoding processing as each control data.

Next, the mobile station apparatus performs a CRC check on each decoded control data using a cyclic redundancy check CRC (Cyclic Redundancy Check) code added to check whether the control data is assigned to the own apparatus. .
Specifically, for each control data, the base station apparatus generates a CRC code from the control data using a predetermined generator polynomial, and assigns the generated CRC code and the downlink control channel to the mobile station of the mobile station apparatus Inspection information (CRC masked by UE ID) obtained by taking an exclusive OR with the identifier is added to the control data. The base station apparatus multiplexes and transmits control data including the added inspection information to the control channel element of the downlink control channel.
The mobile station apparatus detects whether or not control data addressed to itself is transmitted together with error detection by performing reverse processing of the process performed by the base station apparatus on the data detected as each control data.

For example, in the case of a downlink control channel as shown in FIG. 26, the mobile station apparatus has 2 CCE 1 to CCE 8 for 8 CCE sets 1 and 4 CCE sets 2. A total of 15 combinations of control channel elements for one CCE set 4 and one CCE set 8 are selected.
Next, for example, the mobile station apparatus in which DCI format 0, DCI format 1A, and DCI format 1 (referred to as “0”, “1A”, and “1”, respectively) are notified from the base station apparatus, the selected control channel element As for the data obtained by demodulating the signals of the respective combinations, the downlink control channel data is detected for each control data amount for each of the control data formats of “0”, “1A”, and “1”, and each control is performed. Decoding processing and CRC check are performed as data.

For example, when the mobile station apparatus is notified of the control data format of “0”, “1”, “1A” from the base station apparatus, “0” is obtained for the signal data of each selected combination of control channel elements. Next, the decoding process and the CRC check are performed as the control data “1” and then as the control data “1A”.
Such processing is called brute decoding of the downlink control channel, and the number of round-robin decoding increases as the number of control data formats with different amounts of control data increases.

Here, the modulation scheme of the downlink control channel is fixed, and several candidates are set for the coding rate for each number of CCE sets. The number of downlink control channel candidates depends on the number of control data formats notified from the base station apparatus by the mobile station apparatus. Therefore, when brute force decoding is performed, decoding and CRC checking are performed for each candidate coding rate corresponding to the number of CCE sets for each combination of control channel elements.
That is, if there are two candidate coding rates according to the number of CCE sets of a certain control channel element combination, decoding for the combination of control channel elements when each of these two coding rates is used, CRC Since the check is performed, two types of decoding and CRC check are performed on the combination of the control channel elements.

The coding rate varies depending on the amount of control data in the control data format transmitted on the downlink control channel. That is, the mobile station apparatus also identifies the control data format used for the downlink control channel by brute force decoding of the downlink control channel.
In EUTRA, the amount of control data in DCI format 0 and DCI format 1A is the same, and identification of these control data formats is performed by decoding a format identification flag included in the control data. The amount of control data in other control data formats is different.

Also, as the system bandwidth increases, the number of control channel elements increases, the total number of downlink control channel decoding increases, and the processing load on the mobile station apparatus increases.
For this reason, a method of reducing the total number of times of decoding of the downlink control channel is used. The mobile station apparatus sets a control channel element for decoding the downlink control channel for each mobile station apparatus. Specifically, the mobile station apparatus selects a control channel element number (Starting point index) for starting decoding of the downlink control channel by a hash function having the mobile station identifier as an input. A control channel element number for starting decoding of the downlink control channel is selected for each number of CCEs. The mobile station apparatus decodes the downlink control channel using a plurality of control channel elements from the selected control channel element number (hereinafter, the plurality of control channel elements for the mobile station apparatus to decode the downlink control channel) (Referred to as UE specific search space).

The base station device recognizes the mobile station identifier of the mobile station device to which the downlink control channel is allocated, and controls the mobile station device individually in the control channel element in the mobile station individual search band selected according to the mobile station identifier. The downlink control channel including data is multiplexed and transmitted. In this way, a method is used in which the mobile station apparatus reduces the number of times of decoding the downlink control channel by limiting the control channel elements for decoding the downlink control channel.

On the other hand, in 3GPP, fourth generation cellular mobile communication ⁽⁴ th Generation; hereinafter, "4G" hereinafter) radio access technology (Advanced EUTRA; hereinafter, "A-EUTRA" hereinafter) and, considering the 4G network (Advanced EUTRAN) Has started.
In A-EUTRA, it has been studied to support a wider frequency band than EUTRA and to ensure compatibility with EUTRA, and the base station apparatus is a part of the frequency band (hereinafter referred to as subband). ) To communicate with a mobile station apparatus compatible with A-EUTRA and a mobile station apparatus compatible with EUTRA. For example, a wireless communication system composed of a plurality of frequency bands with a frequency band of EUTRA as a unit has been studied.
Also, a layered OFDM scheme has been proposed in which OFDM, which is multicarrier transmission, is used as the downlink of A-EUTRA, and communication is performed using a plurality of frequency bands. (Non-Patent Document 1)

In addition, a method in which a mobile station apparatus spatially multiplexes transmission data using multiple antennas for transmission of an uplink shared data channel and performs large-capacity data communication: UL SU-MIMO (Up Link Single User Multiple Multiple Input Multiple Output. ), The base station apparatus and the mobile station apparatus for transmitting the downlink shared data channel perform spatial multiplexing of transmission data with a larger number of spatial multiplexing than EUTRA using more antennas than EUTRA, and further perform large-capacity data communication Method to perform: Enhanced DL SU-MIMO (Down Link Single User-Multiple Input Multiple Output), multiple base station devices for downlink shared data channel A method of performing spatial multiplexing of transmission data of each mobile station apparatus using a plurality of antennas and performing data communication of the plurality of mobile station apparatuses with the same time and frequency resources: DL MU-MIMO (Down Link Multiple User-Multiple Input Multiple Multiple Application) is being studied.

Thus, in the application of a new transmission method for the downlink shared data channel, a new control data format is required. That is, it is considered that A-EUTRA further increases the number of control data formats with different amounts of control data compared to EUTRA.
For example, regarding the radio resource allocation information of the downlink shared data channel included in the downlink control channel, it is conceivable that different types of radio resource allocation information from EUTRA are applied. Radio resource allocation information for supporting radio resource allocation of a downlink shared data channel up to 20 MHz, which is the maximum system bandwidth of EUTRA, in a radio communication system in which the system bandwidth of a base station apparatus corresponding to A-EUTRA is 100 MHz, 40 MHz It is considered that radio resource allocation information that supports radio resource allocation up to 100 MHz and radio resource allocation information that supports radio resource allocation up to 100 MHz are applied to the downlink control channel.
Also, because the uplink shared data channel and downlink shared data channel are transmitted using technologies such as UL SU-MIMO, Enhanced DL SU-MIMO, and DL MU-MIMO, the configuration of control data is optimal for those technologies. It is considered that a control data format of a different type from the EUTRA control data format is applied to the downlink control channel.

3GPP TSG RAN1 # 53, Kansas City, USA, 5-9 May, 2008, R1-081948 “Proposals for LTE-Advanced Technologies”

However, in the conventional EUTRA technology, the receiving apparatus performs the decoding process for each candidate of a plurality of types of control data formats (data formats) to detect the control data. Therefore, the detected control data is the control data addressed to the own apparatus. However, there is a drawback in that the control channel is decoded and a load is applied to the receiving apparatus.
In particular, as the number of new control data formats increases, the number of control data format candidates increases, and the conventional receiving apparatus has a drawback in that the influence of the decoding processing itself increases because the load on the decoding process itself increases.

The present invention has been made in view of the above points, and an object of the present invention is to provide a radio communication system, a receiving apparatus, and a transmission capable of reducing the number of times of decoding control channel and reducing the load on the receiving apparatus. An apparatus, a reception control method, a transmission control method, a reception control program, and a transmission control program are provided.

(1) The present invention has been made to solve the above problems, and one aspect thereof includes a transmission device that transmits a transmission signal and a reception device that receives the transmission signal from the transmission device. In the wireless communication system, the transmission device includes a transmission unit that transmits a control information indicator indicating that there is control information addressed to each of the reception devices in the transmission signal, and the reception device is addressed to the own device. An individual control signal decoding unit that performs a decoding process of the control information when a control information indicator indicating that there is control information is detected, and does not perform a decoding process of the control information when it is not detected A wireless communication system.
According to the above configuration, the wireless communication system can reduce the number of times of decoding the individual control information, and can reduce the load on the receiving device.

(2) One aspect of the present invention is a wireless communication system, wherein the control information is selected from a plurality of types of control data.

(3) According to another aspect of the present invention, in a wireless communication system including a transmission device that transmits a transmission signal and a reception device that receives the transmission signal from the transmission device, the transmission device includes the reception device. Control information addressed to each device, an individual control signal placement unit for placing a signal of individual control information, which is control data selected from a plurality of types of control data having different data formats or a combination thereof, in the band; For each receiving device, when there is the individual control information addressed to the receiving device, a control information indicator generating unit that generates a control information indicator indicating that the individual control information addressed to the receiving device is present; and the receiving device Based on a receiving device identifier to be identified, an individual search band is allocated, and at least of the individual signal arrangement bands obtained by dividing the allocated individual search band A control information indicator signal arrangement unit for arranging the control information indicator addressed to the reception device of the reception device identifier generated by the control information indicator generation unit, and a signal of individual control information arranged by the individual control signal arrangement unit A control information indicator arranged by the control information indicator signal arrangement unit, and a transmission unit that transmits the control information indicator included in the transmission signal. The individual search band is selected based on the receiving device identifier, and the individual signal arrangement band candidate in the selected individual search band is selected as the transmission signal arranged in the candidate individual signal arrangement band. By performing the decoding process, a control information indicator for detecting a control information indicator indicating that there is the individual control information addressed to the own device. When the indicator detection unit and the control information indicator detection unit detect a control information indicator indicating that there is the individual control information addressed to the own device, a plurality of types of control data candidates for the signal of the individual control information When the control information indicator detection unit does not detect a control information indicator indicating that there is the individual control information addressed to its own device, the decoding process is not performed on the signal of the individual control information. A radio communication system comprising: an individual control signal decoding unit.
According to the above configuration, the wireless communication system transmits a control information indicator indicating that there is the individual control information addressed to the receiving device when the transmitting device has the individual control information addressed to the receiving device, When the receiving device detects a control information indicator indicating that there is the individual control information addressed to the own device, the receiving device performs a decoding process on each of the individual types of control data for the individual control information signal, and When the control information indicator indicating that there is individual control information addressed to the device is not detected, since the decoding process is not performed on the signal of the individual control information, the number of decoding processes of the individual control information can be reduced, The load on the receiving device can be reduced.
Further, in the wireless communication system, since the receiving device can reduce the number of times of decoding processing of the individual control information signal, the number of types of data format of control data is increased and the decoding processing of the signal of the individual control information is performed. Even if the load increases, the load can be prevented from significantly increasing in the receiving apparatus.

(4) In addition, according to one aspect of the present invention, the control information indicator generation unit, when there is the individual control information addressed to the receiving device in a predetermined time band, the individual control information addressed to the receiving device. A wireless communication system is characterized by generating a control information indicator indicating that there is a message.

(5) Further, according to one aspect of the present invention, the transmission apparatus transmits the transmission signal in a band element having a predetermined size band identified by a band element number. The individual control signal arrangement unit arranges the signal of the individual control information in one or more band elements having consecutive band element numbers, and the control information indicator generation unit includes the individual control signal An arrangement unit generates the control information indicator including the minimum number band information indicating the band element of the smallest band element number among the band element numbers of the band elements where the signal of the individual control information is arranged, and the control information indicator The detection unit decodes the control information indicator addressed to its own device to detect the minimum number band information, and the individual control signal decoding unit detects the control information indicator The radio is characterized by demodulating a signal arranged in one or more band elements having consecutive band element numbers from the band element indicated by the minimum number band information detected by, and performing decoding processing on the demodulated information. It is a communication system.

(6) Further, according to one aspect of the present invention, the transmission device transmits the transmission signal in a band element having a predetermined size band identified by a band element number. The individual control signal arrangement unit is arranged in one or more band elements having consecutive band element numbers in a band of a band element set that is a set of a predetermined number of band elements, The control information indicator generating unit generates the control information indicator including information indicating a band element set including a band element in which the signal of the individual control information is arranged, and the control information indicator detecting unit is addressed to the own device. The control information indicator is decoded to detect information indicating the band element set, and the individual control signal decoding unit indicates information detected by the control information indicator detection unit. Wherein demodulating the one or more configuration signals to the band element of the band element set, a radio communication system and performs a decoding process on the demodulated information.

(7) Further, according to one aspect of the present invention, the control information indicator generation unit includes a band element number of one or more band elements in which the individual control signal arrangement unit arranges the signal of the individual control information. The control information indicator including the relative difference, which is the difference between the minimum band element number and the band number where the control information indicator signal arrangement unit arranges the control information indicator, as the minimum number band information is generated and controlled. The information indicator detection unit decodes the control information indicator addressed to its own device to detect the relative difference, and the individual control signal decoding unit detects a band element in which the control information indicator detection unit detects the control information indicator. One or more band elements including the band element of the band element number of the number obtained by adding the relative difference to the band element number of It demodulates the placement signal, a radio communication system and performs a decoding process on the demodulated information.

(8) In addition, according to an aspect of the present invention, the control information indicator generation unit includes a minimum band element number among band element numbers of band elements in which the individual control signal arrangement unit arranges the signal of the individual control information. A relative difference that is a difference between the band element number of the band element in the individual search band in which the control information indicator signal arrangement unit arranges the control information indicator and the smallest band element number is included as the minimum number band information. The control information indicator is generated, the control information indicator detecting unit decodes the control information indicator addressed to the own device to detect the relative difference, and the individual control signal decoding unit detects the control information indicator. Is the smallest band element number among the band element numbers of the band elements in the individual search band in which the control information indicator is detected. A radio communication system characterized by demodulating a signal arranged in one or more band elements including a band element having a band element number of the number to which the relative difference is added, and performing decoding processing on the demodulated information It is.

(9) According to another aspect of the present invention, the transmission device transmits a transmission signal using a system band including a plurality of subbands that are predetermined frequency bandwidths. The control information indicator generation unit generates the control information indicator including the individual control signal subband information indicating the subband in which the individual control signal arrangement unit arranges the signal of the individual control information, and detects the control information indicator The unit decodes the control information indicator addressed to its own device to detect the individual control signal subband information, and the individual control signal decoding unit detects the individual control signal subband information detected by the control information indicator detection unit. Demodulate a signal arranged in one or more band elements including the band in the subband indicated by, and decode the demodulated information A wireless communication system, which comprises carrying out.

(10) Further, according to one aspect of the present invention, the transmission device identifies the transmission signal in a band having a predetermined size, and is identified by a band element number in each subband of the subband. The transmission device is arranged in a band element that is a band, and the band element number is associated in advance with the band element number in one subband and the band element number in another subband. The individual control signal arrangement unit is configured to associate the band element number of the band element in which the control information indicator signal arrangement unit arranges the control information indicator and the band element associated with each other in the subband. The signal of the individual control information is arranged in the band element of the number, and the individual control signal decoding unit is a band element number in the subband indicated by the individual control signal subband information. The control information indicator detection unit is arranged in one or more band elements whose band element numbers are continuous from the band element of the band element number associated with the band element number of the band element where the control information indicator is detected. The radio communication system is characterized by demodulating the received signal and decoding the demodulated information.

(11) Further, according to one aspect of the present invention, the control information indicator generation unit includes band element number information indicating the number of band elements in which the individual control signal arrangement unit arranges the signal of the individual control information. The control information indicator is generated, the control information indicator detection unit decodes the control information indicator addressed to the own device to detect the band element number information, and the individual control signal decoding unit detects the control information indicator The wireless communication system is characterized by demodulating signals arranged in the number of band elements indicated by the band element number information detected by the unit and performing decoding processing on the demodulated information.

(12) Further, according to one aspect of the present invention, the control information indicator generation unit arranges the control information indicator in an individual signal arrangement band that is a predetermined size band, and the control information indicator detection unit The wireless communication is characterized by performing decoding processing on the transmission signal arranged in the candidate individual signal arrangement band with the predetermined size band as the individual signal arrangement band candidate. System.

(13) Further, according to one aspect of the present invention, when a receiving apparatus that receives a transmission signal from a transmitting apparatus detects a control information indicator indicating that there is control information addressed to the own apparatus, the decoding process of the control information is performed. And a dedicated control signal decoding unit that does not perform the decoding process of the control information when it is not detected.

(14) Further, according to one aspect of the present invention, in a transmission apparatus that transmits a transmission signal to the reception apparatus, a control information indicator indicating that there is control information addressed to each reception apparatus is included in the transmission signal and transmitted. A transmission apparatus comprising a transmission unit.

(15) Further, according to one aspect of the present invention, in the reception control method in the reception device that receives a transmission signal from the transmission device, the reception device detects a control information indicator indicating that there is control information addressed to the own device. The reception control method is characterized by having a process of performing the decoding process of the control information when it is detected and not performing the decoding process of the control information when it is not detected.

(16) According to another aspect of the present invention, in the transmission control method in the transmission apparatus that transmits a transmission signal to the reception apparatus, the control information indicator indicating that the transmission apparatus has control information addressed to each of the reception apparatuses. Is included in the transmission signal and is transmitted.

(17) Further, according to one aspect of the present invention, when a computer of a receiving device that receives a transmission signal from a transmitting device detects a control information indicator indicating that there is control information addressed to the own device, the control information It is a reception control program that performs decoding processing and functions as an individual control signal decoding means that does not perform decoding processing of the control information when it is not detected.

(18) Further, according to one aspect of the present invention, the transmission signal includes a computer of the transmission device that transmits the transmission signal to the reception device, and a control information indicator indicating that there is control information addressed to each of the reception devices. A transmission control program characterized by functioning as transmission means for transmission.

According to the present invention, the wireless communication system transmits a control information indicator indicating that there is individual control information addressed to the receiving device when the transmitting device has individual control information addressed to the receiving device, When a control information indicator indicating that there is individual control information addressed to the own device is detected, the individual control information signal is decoded for each of a plurality of types of control data candidates, and the individual control information addressed to the own device When the control information indicator indicating that there is no signal is not detected, the decoding process is not performed on the signal of the individual control information, so the number of decoding processes of the signal of the individual control information can be reduced, and the load on the receiving device Can be reduced.

It is a figure explaining the outline about the whole picture of the radio communications system concerning a 1st embodiment of this invention. It is a figure which shows schematic structure of a downlink radio frame from the base station apparatus which concerns on this embodiment to a mobile station apparatus. It is a figure explaining the logical relationship of the control channel element which concerns on this embodiment, and a downlink control channel. It is a figure explaining the example of arrangement | positioning of the resource element group in the downlink radio frame which concerns on this embodiment. It is a figure explaining numbering of the control channel element in the system band concerning this embodiment. It is a schematic block diagram which shows the structure of the base station apparatus which concerns on this embodiment. It is a schematic block diagram which shows the structure of the transmission process part which concerns on this embodiment. It is a figure explaining an example of the multiplexing process of the downlink control channel which concerns on this embodiment which concerns on this embodiment. It is a schematic block diagram which shows the structure of the mobile station apparatus which concerns on this embodiment. It is a schematic block diagram which shows the structure of the reception process part which concerns on this embodiment. It is a figure explaining an example of the detection process of the downlink control channel which concerns on this embodiment. It is a flowchart which shows an example of the multiplexing process of the downlink control channel which concerns on this embodiment. It is a flowchart which shows an example of the detection process of the downlink control channel which concerns on this embodiment. It is a schematic block diagram which shows the structure of the base station apparatus which concerns on 2nd Embodiment of this invention. It is a schematic block diagram which shows the structure of the transmission process part which concerns on this embodiment. It is a schematic block diagram which shows the structure of the reception process part which concerns on this embodiment. It is a figure explaining an example of the multiplexing process of the downlink control channel which concerns on this embodiment, and a detection process concerning this embodiment. It is a figure explaining the structure of the control channel element set which consists of a some control channel element which concerns on this modification 1. FIG. It is a schematic block diagram which shows the structure of base station apparatus a3 which concerns on the 3rd Embodiment of this invention. It is a schematic block diagram which shows the structure of the transmission process part which concerns on this embodiment. It is a schematic block diagram which shows the structure of the reception process part which concerns on this embodiment. It is a figure explaining an example of the multiplexing process of a downlink control channel which concerns on this embodiment, and a detection process. It is a figure explaining numbering of the control channel element in the system band concerning the modification 4 of this embodiment. It is a figure explaining an example of the multiplexing process of a downlink control channel which concerns on the modification 4 of this embodiment, and a detection process. It is a figure which shows schematic structure of the downlink radio frame which concerns on a prior art. It is a figure explaining the logical relationship of the control channel element which concerns on a prior art, and a downlink control channel. It is a figure explaining the example of arrangement | positioning of the resource element group in the downlink radio frame which concerns on a prior art.

(First embodiment)
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. First, the overall image of the wireless communication system according to the present embodiment and the structure of the wireless frame will be described with reference to FIGS. Next, the downlink control channel according to the present embodiment will be described with reference to FIGS. Next, the configuration of the wireless communication system 1 according to the present embodiment will be described with reference to FIGS.

Hereinafter, the overall image of the wireless communication system according to the present embodiment and the configuration of the wireless frame will be described.
FIG. 1 is a diagram for explaining the outline of the whole image of a radio communication system according to the first embodiment of the present invention.
In the wireless communication system 1 shown in this figure, a base station apparatus A1 (transmitting apparatus) and a plurality of mobile station apparatuses B1 and B2 (receiving apparatuses) perform wireless communication. Base station apparatus A1 transmits a transmission signal using a system band which is a predetermined frequency band. In addition, although base station apparatus A1 is provided with two transmission antennas, this invention is not limited to this, The number may be one or more than two.

Further, in this figure, the downlink of the wireless communication from the base station apparatus A1 to the mobile station apparatuses B1 and B2 includes a downlink pilot channel, a downlink control channel, a downlink shared data channel, and a control format indicator channel. It is composed of
Further, in this figure, the uplink of radio communication from the mobile station apparatuses B1 and B2 to the base station apparatus A1 includes an uplink shared data channel, an uplink pilot channel, and an uplink control channel. It shows that.
Hereinafter, in the present embodiment, the base station device A1 is referred to as a base station device a1, and the mobile station devices B1 and B2 are referred to as a mobile station device b1.

FIG. 2 is a diagram illustrating a schematic configuration of a downlink radio frame from the base station apparatus a1 to the mobile station apparatus b1 according to the present embodiment.
In this figure, the horizontal axis represents the time domain, and the vertical axis represents the frequency domain. The downlink radio frame is a unit such as radio resource allocation, and is composed of a PRB (Physical Resource Block) pair consisting of a frequency band and a time band of a predetermined width. One physical resource block PRB pair is composed of two physical resource blocks PRB that are continuous in the time domain.

Also, in this figure, one physical resource block PRB is composed of 12 subcarriers in the frequency domain, and is composed of 7 OFDM symbols in the time domain.
In this figure, the system band is composed of a plurality of subband bands. For example, a system band with a bandwidth of 100 MHz (megahertz) is composed of five subbands with a bandwidth of 20 MHz. One subband is composed of, for example, 100 physical resource blocks PRB.

Further, in the time domain shown in this figure, there are a slot composed of 7 OFDM symbols, a subframe composed of 2 slots, and a radio frame composed of 10 subframes. A unit composed of one subcarrier and one OFDM symbol is called a resource element. In the downlink radio frame, a plurality of physical resource blocks PRB are arranged according to the system bandwidth.

In each subframe, at least a downlink shared data channel used for transmitting information data and a downlink control channel used for transmitting control data are arranged. Although not shown in this figure, downlink pilot channels used for channel estimation of the downlink shared data channel and the downlink control channel are distributed and arranged in a plurality of resource elements. In this figure, the downlink control channel is arranged in the first, second and third OFDM symbols of the subframe, and the downlink shared data channel is arranged in other OFDM symbols. The OFDM symbol in which the control channel is arranged varies in subframe units.

Although not shown in this figure, a control format indicator channel indicating the number of OFDM symbols constituting the downlink control channel is arranged in the first OFDM symbol, and the downlink control channel is the first OFDM symbol. Or only in the first and second OFDM symbols. Also, the downlink control channel and the downlink shared data channel are not arranged together in the same OFDM symbol.
In the downlink control channel, a mobile station identifier, radio resource allocation information of the downlink shared data channel, multi-antenna related information, a modulation scheme, a coding rate, a retransmission parameter, and the like are arranged.

Here, a plurality of types of control data formats are used for the control data format (data format) of the control data arranged in the downlink control channel. For example, a plurality of types of control data formats having different amounts of control data are used. It is done.

As shown in FIG. 3, the downlink control channel includes a plurality of control channel elements (also referred to as CCE: Control Channel Element). Details of the configuration of the control channel element will be described later.
FIG. 3 is a diagram illustrating a logical relationship between the control channel element and the downlink control channel according to the present embodiment. Here, CCE t indicates a control channel element having a control channel element index (band element number) t. The control channel element index is a number that identifies the control channel element.

The downlink control channel is configured by a set of a plurality of control channel elements. The number of control channel elements (number of band elements) constituting this set is hereinafter referred to as “CCE aggregation number” (CCE aggregation number).
The number of CCE sets constituting the downlink control channel is determined according to the coding rate and the amount of control data. In addition, a set of n control channel elements is hereinafter referred to as “CCE set n” (individual signal allocation band). For example, a downlink control channel is configured by one control channel element (CCE set 1), a downlink control channel is configured by two control channel elements (CCE set 2), and four control channel elements To configure a downlink control channel (CCE set 4), or to configure a downlink control channel with eight control channel elements (CCE set 8).

As shown in FIG. 4, the control channel element includes a plurality of resource element groups (also referred to as mini-CCE).
FIG. 4 is a diagram for explaining an arrangement example of resource element groups in a downlink radio frame according to the present embodiment. This figure shows an arrangement example in which the downlink control channel is composed of the first to third OFDM symbols, and the downlink pilot channels of two transmission antennas (transmission antenna 1 and transmission antenna 2) are arranged. . In this figure, the horizontal axis represents the frequency domain, and the vertical axis represents the time domain.

In the arrangement example shown in this figure, one resource element group is composed of four resource elements, and is composed of adjacent resource elements in the frequency domain. In this figure, resource elements to which the same reference numerals of downlink control channels are assigned belong to the same resource element group. Note that resource element R1 (downlink pilot channel signal of transmission antenna 1) and R2 (downlink pilot channel signal of transmission antenna 2) in which the downlink pilot channel is arranged are skipped to form a resource element group.

This figure also shows the numbering of the resource element groups adjacent to the frequency of the resource element group where the numbering (symbol “2”) of the second OFDM symbol in which the downlink pilot channel is not arranged next is performed (symbol “ 4 ”), and the number of the adjacent resource element group of the frequency of the resource element group to which the numbering (symbol“ 3 ”) of the third OFDM symbol in which the downlink pilot channel is not allocated is performed (symbol) “5”) is performed.
Further, in this figure, the resource element group adjacent to the frequency of the resource element group to which the first OFDM symbol is numbered (symbol “1”) is numbered (symbol “6”). Next, the resource element group adjacent to the frequency of the resource element group on which the second OFDM symbol is numbered (symbol “4”) is numbered (symbol “7”), and then the third OFDM symbol is numbered. This indicates that numbering (symbol “8”) is performed on the resource element group adjacent to the frequency of the resource element group on which symbol numbering (symbol “5”) is performed. Subsequent numbering is performed for the resource element groups of the physical resource block PRB pair.

The control channel element is composed of a plurality of resource element groups configured as shown in this figure in a subband which is a predetermined band. For example, one control channel element is composed of nine different resource element groups distributed in the frequency domain and the time domain. Specifically, for the entire subband bandwidth, all resource element groups numbered as shown in this figure are interleaved in resource element group units using a block interleaver. One control channel element is constituted by nine resource element groups having consecutive numbers.
Note that the number of subband resource element groups, that is, the number of control channel elements, is the subband bandwidth, the number of downlink pilot channels according to the number of transmission antennas of the base station apparatus a1 used for communication, and the downlink control channel. It depends on the number of OFDM symbols to be configured.

FIG. 5 is a diagram illustrating numbering of control channel elements in the system band according to the present embodiment. This figure shows that 5 subbands are configured in the system band, and 20 control channel elements are configured in each subband.
In the frequency domain, the frequency band of subband s (s is a natural number, hereinafter s is referred to as a subband number) is assumed to be smaller than the frequency band of subband s + 1. For example, it is assumed that the frequency of the frequency band of subband 1 is smaller than the frequency of the frequency band of subband 2, and the frequency of the frequency band of subband 2 is smaller than the frequency of the frequency band of subband 3.

Base station apparatus a1 first interleaves resource elements in subband 1 using a block interleaver. The base station apparatus a1 receives CCE 1, CCE 2, CCE 3, CCE 4, CCE 5, CCE 6, CCE in the order of output from the block interleaver for control channel elements each consisting of nine resource element groups. 7, CCE 8, CCE 9, CCE 10, CCE 11, CCE 12, CCE 13, CCE 14, CCE 15, CCE 16, CCE 17, CCE 18, CCE 19, CCE 20 are numbered. Hereinafter, in this embodiment, the number t of CCE t (t is a natural number) on which this numbering is performed is the control channel element index t.

Next, the base station apparatus a1 continues to CCE 21, CCE 22, CCE 23, CCE 24, CCE 25, CCE 26, CCE 27, CCE 28, CCE 29, and so on for the control channel element of subband 2. CCE 30, CCE 31, CCE 32, CCE 33, CCE 34, CCE 35, CCE 36, CCE 37, CCE 38, CCE 39, CCE 40 are numbered. Similarly, the base station apparatus a1 assigns the control channel element index t to the control channel elements of subband 3, subband 4, and subband 5 in the same manner.

Hereinafter, the configuration of the base station apparatus a1 according to the present embodiment will be described with reference to FIGS.
FIG. 6 is a schematic block diagram showing the configuration of the base station apparatus a1 according to this embodiment. As shown in this figure, the base station apparatus a1 includes a reception processing unit a11, a radio resource control unit a12, a control unit a13, and a transmission processing unit a14.

Under the control of the control unit a13, the reception processing unit a11 demodulates and decodes the reception signal received from the mobile station apparatus b1 by the reception antenna, and extracts control data and information data. The reception processing unit a11 outputs the extracted control data to the control unit a13, and outputs information data to the upper layer.

The radio resource control unit a12 transmits the transmission power of each mobile station apparatus b1, intermittent transmission / reception cycle, CQI (Channel Quality Indicator) signal transmission period, downlink shared data channel, uplink shared data channel modulation scheme, It manages radio resource control information including coding rate and the like. The radio resource control unit a12 outputs the radio resource control information to the control unit a13.

Further, the radio resource control unit a12 schedules radio resource allocation of the downlink control channel to the mobile station apparatus b1. Also, the radio resource control unit a12 determines the coding rate of the downlink control channel.
Also, the radio resource control unit a12 outputs control information including the mobile station identifier of the mobile station device b1 to which radio resources are allocated and the determined coding rate, to the control unit a13.

Based on the downlink control channel coding rate of the control information input from the radio resource control unit a12, the control unit a13 determines the number of control channel elements (the number of CCE sets) of the downlink control channel to be allocated to the mobile station apparatus b1. decide.
The control unit a13 receives information on the control information input from the radio resource control unit a12, the radio resource control information, the determined number of CCE sets, and the mobile station identifier of the mobile station device b1 to which the downlink control channel is allocated. It is included in a control signal for controlling the transmission processing unit a14 generated based on the information and is output to the transmission processing unit a14.

Further, as will be described later, when there is control data specific to the mobile station device b1 to which the downlink control channel is allocated or a combination thereof (individual control information addressed to the mobile station device b1), the control unit a13 The transmission processing unit a14 is controlled so as to generate a control information indicator indicating that there is control data.

Moreover, the control part a13 produces | generates the control channel information transmitted using the downlink control channel about the mobile station apparatus b1 which allocates a downlink control channel.
Next, the control unit a13 generates a CRC code by using a predetermined generator polynomial for the generated control channel information, and assigns the generated CRC code and the mobile station identifier of the mobile station device b1 to which the downlink control channel is assigned. Test information (CRC masked by UE ID) obtained by exclusive OR is generated.

The control unit a13 generates control data from the generated control channel information and the generated inspection information in accordance with a data format (referred to as a control data format (Downlink Control Information format)).
The base station apparatus a1 notifies the control data format of control data used for communication with the mobile station apparatus b1 to the mobile station apparatus b1 that uses the control data at the start of communication connection. Here, during the communication between the base station apparatus a1 and the mobile station apparatus b1, a plurality of control data are transmitted and received, so the base station apparatus a1 notifies the mobile station apparatus b1 of the plurality of control data formats.

The control unit a13 outputs the generated control data or a plurality of control data (control data or a combination thereof) to the transmission processing unit a14.
For example, when the control unit a13 uses a combination of control data in the control data format x, the control data format y, and the control data format z (referred to as “x”, “y”, and “z”, respectively), In one subframe, one of the control data in the control data format “x”, “y”, “z” is output to the transmission processing unit a14.

The control data included in the information transmitted using the downlink control channel includes mobile station identifier, downlink shared data channel radio resource allocation information, multi-antenna related information, modulation scheme, coding rate, retransmission parameter, It consists of information such as inspection information, and is transmitted as a downlink control channel signal from the transmission processing unit a14 to the mobile station device b1 of the mobile station identifier of the control data.

The control unit a13 controls the radio resource allocation, the modulation scheme, and the coding rate of the downlink shared data channel based on the control information and the radio resource control information input from the radio resource control unit a12, and the transmission processing unit a14. To. The control unit a13 controls the reception processing unit a11.

The transmission processing unit a14 generates and transmits a downlink control channel, a downlink shared data channel, and a control information indicator based on the control signal input from the control unit a13.
Details of the transmission processing unit a14 will be described later.

Details of the transmission processing unit a14 will be described below.
FIG. 7 is a schematic block diagram illustrating the configuration of the transmission processing unit a14 according to the present embodiment.
As shown in this figure, the transmission processing unit a14 includes a plurality of downlink shared data channel processing units a141-1 to a141-m, a plurality of downlink control channel processing units a142-1 to a142-n, and a CCE aggregation processing unit. a144, a control information indicator generation unit a143, a pilot channel processing unit a145, a multiplexing unit a146 (individual control signal arrangement unit), transmission units a147-1, a147-2, and transmission antennas a148-1, a148-2 Consists of.

The downlink shared data channel processing units a141-1 to a141-m, the downlink control channel processing units a142-1 to a142-n, and the transmission units a147-1 and a147-2 have the same configuration and One of them (respectively, the downlink shared data channel processing unit a141-1, the downlink control channel processing unit a142-1, and the transmission unit a1477-1) will be described as a representative.

Also, as shown in this figure, the downlink shared data channel processing units a141-1 to a141-m are respectively provided with a turbo code unit a1411, a data modulation unit a1412, and S / P (Serial / Parallel; serial / parallel conversion). ) Part a1413.
Also, as shown in this figure, the downlink control channel processing units a142-1 to a142-n include a convolutional code unit a1421, a QPSK (Quadrature Phase Shift Keying) modulation unit a1422, and S / P part a1423.

Further, as shown in this figure, the transmission units a147-1, a147-2 include an IFFT (Inverse Fast Fourier Transform) unit a1471, a GI (Guard Interval) insertion unit a1472, D / A. (Digital-to-analog conversion) unit a1473 and transmission RF (Radio Frequency; radio frequency) unit a1474.

The downlink shared data channel processing unit a141-1 performs baseband processing for transmitting information data to the mobile station apparatus b1 by the OFDM scheme.
The turbo coding unit a1411 performs turbo coding for increasing the error tolerance of the data at the coding rate indicated by the control signal in accordance with the control signal input from the control unit a13, and the data modulation unit a1411 a1412.

The data modulation unit a1412 modulates the code data encoded by the turbo encoding unit a1411 according to the control signal input from the control unit a13, for example, QPSK, 16QAM (16 Quadrature Amplitude Modulation; 16 quadrature amplitude modulation). ), 64QAM (64 Quadrature Amplitude Modulation), and a modulation symbol signal sequence is generated. The data modulation unit a1412 outputs the generated signal sequence to the S / P unit a1413.
The S / P unit a1413 converts the serial signal sequence (stream) input from the data modulation unit a1412 into a parallel signal sequence, and outputs the parallel signal sequence to the multiplexing unit a146.

The downlink control channel processing unit a142-1 transmits the control data (radio resource allocation information, mobile station identifier, etc.) specific to the mobile station apparatus b1 in the OFDM scheme in accordance with the control signal input from the control unit a13. Perform baseband processing.
The convolutional coding unit a1421 performs convolutional coding for increasing error tolerance of control data based on the coding rate indicated by the control signal in accordance with the control signal input from the control unit a13. Here, the control data is controlled in bit units. The convolutional coding unit a1421 also performs rate matching to adjust the number of output bits for the bits subjected to the convolutional coding processing based on the coding rate indicated by the control signal input from the control unit a13.
The convolutional code unit a1421 outputs the encoded control data to the QPSK modulation unit a1422.

The QPSK modulation unit a1422 modulates the control data encoded by the convolutional code unit a1421 using the QPSK modulation method, and outputs the modulated modulation symbol signal sequence to the S / P unit a1423.
The S / P unit a1423 converts the serial signal sequence output from the QPSK modulation unit a1422 into a parallel signal sequence, and outputs the parallel signal sequence to the CCE set processing unit a144.

The control information indicator generation unit a143 generates a control information indicator indicating that there is individual control data for the mobile station device b1 according to the control signal input from the control unit a13. Note that the control information indicator has a data amount different from that of various control data formats constituting the individual control data of the mobile station apparatus b1 in the downlink control channel.

The control information indicator generation unit a143 is a control information indicator arranged in the downlink control channel of the subframe when there is individual control data for the mobile station apparatus b1 within the subframe (predetermined time band), and the control information indicator A control information indicator indicating that there is individual control data for the station apparatus b1 is generated.
Specifically, the control information indicator generating unit a143 generates a bit sequence in which a predetermined number of bits all indicate “1” when there is individual control data for the mobile station apparatus b1 in the subframe, and the generated bit sequence A CRC code is generated using a predetermined generator polynomial. Next, the control information indicator generation unit a143 performs check information (CRC masked by UE) that is an exclusive OR of the generated CRC code and the mobile station identifier of the mobile station device b1 that is the transmission destination of the control information indicator. ID).
The control information indicator generation unit a143 performs convolutional coding and QPSK modulation on the information obtained by adding the generated check information to the generated bit sequence to generate a control information indicator.
The control information indicator generation unit a143 outputs the generated control information indicator to the CCE set processing unit a144.
The control information indicator generation unit a143 does not generate a control information indicator for the mobile station device b1 when there is no individual control data for the mobile station device b1 in the subframe.

The CCE set processing unit a144, based on the control signal input from the control unit a13, the control information indicator generating unit a143 based on the mobile station identifier (receiving device identifier) of the mobile station device b1 indicated by the control signal and the number of CCE sets. The control channel element which arrange | positions the control-information indicator which produced | generated and the signal of the downlink control channel which S / P part a1423 output is selected.
Details of the process of selecting the control channel element performed by the CCE aggregation processing unit a144 will be described later together with the multiplexing process performed by the multiplexing unit a146.

The CCE aggregation processing unit a144 performs processing for rearranging the downlink control channel signal so that the control information indicator and the downlink control channel signal are arranged in the resource element group of the selected control channel element.
Specifically, the CCE aggregation processing unit a144 includes a block interleaver, and interleaves the downlink control channel signal arranged in the control channel element for each subband in resource element group units.
The CCE set processing unit a144 outputs the interleaved signals to the multiplexing unit a146 in the order of the interleave processing results.

The pilot channel processing unit a145 generates a downlink pilot channel signal, which is a known signal in the mobile station apparatus b1, and outputs the downlink pilot channel signal to the multiplexing unit a146.

Multiplexer a146 transmits the signal input from pilot channel processing unit a145 and the signals input from downlink shared data channel processing units a141-1 to a141-m according to the control from control unit a13. Multiplexed in link radio frame.
Also, the multiplexing unit a146 multiplexes the signal input from the CCE aggregation processing unit a144 into the downlink radio frame.

The multiplexing unit a146 performs multiplexing between the downlink shared data channel and the downlink control channel by time multiplexing as illustrated in FIG. The multiplexing unit a146 performs multiplexing between the downlink pilot channel and other channels by time / frequency multiplexing. Further, the multiplexing unit a146 performs multiplexing of the control information indicator and the downlink control channel by time / frequency multiplexing for each control channel element.
Details of the multiplexing process of the downlink control channel to the control channel element of the multiplexing unit a146 will be described later.
The multiplexing unit a146 outputs the multiplexed signal to the transmission units a147-1 and a147-2.
The CCE aggregation processing unit a144 and the multiplexing unit a146 are referred to as a control information indicator signal arrangement unit A100.

Transmitting sections a147-1 and a147-2 transmit the multiplexed signals input from multiplexing section a146 to mobile station apparatus b1 via transmitting antennas a148-1 and a148-2, respectively.

IFFT section a1471 performs fast inverse Fourier transform on the signal multiplexed by multiplexing section a146, performs OFDM modulation, and outputs the result to GI insertion section a1472.
The GI insertion unit a 1472 generates a baseband digital signal composed of symbols in the OFDM scheme by adding a guard interval to the signal modulated by the OFDM scheme a 1471 in the OFDM scheme. The guard interval is generated by duplicating the beginning or end part of the symbol to be transmitted.
The GI insertion unit a1472 outputs the generated baseband digital signal to the D / A unit a1473.

The D / A unit a 1473 converts the baseband digital signal input from the GI insertion unit a 1472 into an analog signal and outputs the analog signal to the transmission RF unit a 1474.
The transmission RF unit a1474 generates an in-phase component and a quadrature component of the intermediate frequency from the analog signal input from the D / A unit a1473, and removes an extra frequency component for the intermediate frequency band. Next, the transmission RF unit a1474 converts (up-converts) the intermediate frequency signal into a high frequency signal, removes excess frequency components, amplifies the power, and transmits the transmission antenna a148-1 (transmission unit a147-2). In this case, the data is transmitted to the mobile station apparatus b1 via the transmission antenna a148-2).

Hereinafter, the multiplexing process to the control channel element of the downlink control channel performed by the CCE aggregation processing unit a144 and the multiplexing unit a146 will be described. A specific example will be described with reference to FIG.

The CCE set processing unit a144 inputs the mobile station identifier (receiving device identifier) of the mobile station device b1 to which the downlink control channel is allocated to the predetermined hash function f, and the control channel element index t1 that is the output result is input. Then, the mobile station apparatus b1 selects as a control channel element index (hereinafter referred to as a starting point index) for starting decoding of the downlink control channel. Here, the hash function f is a function that outputs a start point number t in response to an input of a mobile station identifier (receiving device identifier).

The CCE aggregation processing unit a144 allocates a downlink control channel signal to a control channel element having a predetermined number of control channel elements in the same subband and starting from the start point number t1. It is selected as a control channel element (hereinafter referred to as a mobile station individual search band (UE specific search band)).
As shown in FIG. 3, the CCE set processing unit a144 sets the selected mobile station individual search band as control channel elements corresponding to the number of CCE sets indicated by the control signal in accordance with the control signal input from the control unit a13.

First, the CCE aggregation processing unit a144 selects a control channel element in which a control information indicator is arranged from the selected mobile station individual search band. Here, the CCE aggregation processing unit a144 places control information indicators in the same number of control channel elements as the number of CCE aggregations indicated by the control signal.
For example, the CCE aggregation processing unit a144 includes a control information indicator in the control channel elements including the smallest control channel element index among the control channel elements in the selected mobile station individual search band and having the number of CCE aggregations indicated by the control signal. .

Next, the CCE aggregation processing unit a144 receives the downlink control channel signal from the control channel element having a larger control channel element index than the control channel element in which the selected control information indicator is arranged in the selected mobile station individual search band. Select the control channel element to be placed.
For example, the CCE aggregation processing unit a144 predetermines priorities for each mobile station device b1, and selects unselected control channel elements in descending order of priority from the smallest control channel element. However, the present invention is not limited to this selection method, and the CCE aggregation processing unit a144 may randomly select a control channel element in which a downlink control channel signal is arranged, or the reception quality of the mobile station apparatus b1 You may select by the method of selecting based on the resource information to allocate.
Alternatively, a CCE set in which a downlink control channel signal is arranged may be selected first, and then a control channel element in which a control information indicator is arranged may be selected.

The CCE set processing unit a144 interleaves the signals arranged in the selected control channel element in units of resource element groups as described above, and outputs the result to the multiplexing unit a146.

The multiplexing unit a146 arranges the downlink control channel signal and the control information indicator input from the CCE aggregation processing unit a144 in the resource element in the input order.

FIG. 8 is a diagram for explaining an example of multiplexing processing of the downlink control channel according to the present embodiment. In this figure, the number of control channel elements constituting the mobile station individual search band is “8”, and the number of control channel elements (CCE aggregation number) used for one downlink control channel signal is “2”. Show the case.

This figure shows a case where the CCE set processing unit a144 inputs the mobile station identifier to the hash function f and selects the control channel element index “31” as the output result as the start point number.

This figure shows that the CCE set processing unit a144 selects “8” control channel elements CCE31 to CCE38 having consecutive numbers from the starting point number “31” as mobile station individual search bands.
In this case, the CCE set processing unit a144 converts the mobile station individual search band, that is, CCE31 to CCE38, into a set that is CCE set 2, two control channel elements CCE31 and CCE32, and two control channels CCE33 and CCE34. Assume that the control element includes two control channel elements, CCE35 and CCE36, and two control channel elements CCE37 and CCE38.

The CCE set processing unit a144 selects one set of the two control channel elements as a control channel element in which a control information indicator is arranged. This figure shows that the CCE aggregation processing unit a144 has selected the two control channel elements hatched CCE33 and CCE34 as control channel elements for arranging control information indicators.
Next, the CCE aggregation processing unit a144 controls two sets of control channel elements having a control channel element index larger than the control channel elements (CCE33 and CCE34) in which the selected control information indicator is arranged, that is, CCE35 and CCE36. A control channel element in which a downlink control channel signal is arranged is selected from the two channel elements CCE 37 and CCE 38. This figure shows that the CCE aggregation processing unit a144 has selected the two control channel elements hatched CCE37 and CCE38 as control channel elements for arranging the downlink control channel.

Hereinafter, the configuration of the mobile station apparatus b1 according to the present embodiment will be described using FIG. 9 and FIG.
FIG. 9 is a schematic block diagram showing the configuration of the mobile station apparatus b1 according to this embodiment. As shown in this figure, the mobile station apparatus b1 includes a reception processing unit b11, a control unit b12, and a transmission processing unit b13.
The reception processing unit b11 receives a signal from the base station device a1, and demodulates and decodes the received signal received from the mobile station device b1 by the reception antenna according to the control of the control unit b12.

Here, the reception processing unit b11 decodes the downlink control channel signal by the following process. First, the reception processing unit b11 selects a mobile station individual search band based on the mobile station identifier (receiving device identifier) of the own device input from the control unit b12. The reception processing unit b11 decodes the control information indicator within the selected mobile station individual search band, and determines whether or not the decoded control information indicator is information indicating that there is control data specific to the own device. To do.

When the control information indicator is information indicating that there is individual control data for the own device, the reception processing unit b11 performs a decoding process on the downlink control channel signal in the selected mobile station individual search band.
In the decoding process of the downlink control channel signal, the reception processing unit b11 detects control data. The reception processing unit b11 is notified in advance of a control data format of control data used for communication with the base station apparatus a1 from the base station apparatus a1 and a plurality of control data formats. The reception processing unit b11 performs a decoding process (referred to as a round robin decoding process) so as to decode the candidate control data for each of the notified control data candidates of a plurality of data formats.
The details of the control information indicator detection method and the downlink control channel detection method will be described later.

When the reception processing unit b11 detects the downlink control channel signal addressed to the own device, the reception processing unit b11 outputs the control data obtained by decoding the downlink control channel signal to the control unit b12.
Further, the reception processing unit b11 outputs information data obtained by decoding the downlink shared data channel addressed to itself to the upper layer based on the control data detected from the downlink control channel.

The control unit b12 outputs a control signal for controlling the reception processing unit b11 and the transmission processing unit b13 based on the control data input from the reception processing unit b11.
Further, the control unit b12 outputs the mobile station identifier of the own device, which is allocated in advance from the base station device a1 and stored in the storage unit (not shown) of the control unit b12, to the reception processing unit b11.
Specifically, the mobile station device b1 communicates with the base station device a1 in a procedure different from that during normal information data communication at the time of initial communication connection, and notified from the base station device a1 in the procedure. The mobile station identifier is acquired and stored in the storage unit of the control unit b12.

In addition, the control unit b12 is notified of a plurality of control data formats, which are control data formats of control data used for communication with the base station apparatus a1. The control unit b12 outputs the notified information of the plurality of control data formats to the reception processing unit b11.
The transmission processing unit b13 encodes data according to the control signal input from the control unit b12, and transmits the modulated signal to the base station apparatus a1 via the transmission antenna.

Details of the reception processing unit b11 will be described below.
FIG. 10 is a schematic block diagram illustrating a configuration of the reception processing unit b11 according to the present embodiment.
As shown in this figure, the reception processing unit b11 includes a reception unit b111, a demultiplexing unit b112, a channel estimation unit b113, a channel compensation unit b114 for a downlink shared data channel, P / S (Parallel / Serial; parallel serial conversion). ) Unit b115, data demodulation unit b116, turbo decoding unit b117, channel compensation unit b118 for control information indicator and downlink control channel, CCE reconfiguration unit b119, control information indicator detection unit b120, start CCE selection unit b121, and A control channel decoding unit (individual control signal decoding unit) b122 is included.

As shown in this figure, the reception unit b111 includes a reception RF unit b1111, an A / D (analog / digital conversion) unit b1112, a symbol timing detection unit b1113, a GI removal unit b1114, and an FFT unit b1115.
Further, as shown in this figure, the control channel decoding unit b122 includes a CCE selection unit b1221, a QPSK demodulation unit b1222, a Viterbi decoder unit b1223, and a CRC check unit b1224.

The receiving unit b111 receives a signal from the base station apparatus a1 via the receiving antenna.
The reception RF unit b1111 appropriately amplifies the signal received by the antenna, converts it to an intermediate frequency (down-conversion), removes unnecessary frequency components, and controls the amplification level so that the signal level is properly maintained. Then, quadrature demodulation is performed based on the in-phase component and the quadrature component of the received signal.
The reception RF unit b1111 outputs the quadrature demodulated analog signal to the A / D unit b1112.

The A / D unit b1112 converts the analog signal quadrature demodulated by the reception RF unit b1111 into a digital signal, and outputs the converted digital signal to the symbol timing detection unit b1113 and the GI removal unit b1114.
The symbol timing detection unit b1113 detects the symbol timing based on the digital signal converted by the A / D unit b1112 and outputs a control signal indicating the detected symbol boundary timing to the GI removal unit b1114.

The GI removal unit b1114 removes a portion corresponding to the guard interval from the digital signal output from the A / D unit b1112 based on the control signal from the symbol timing detection unit b1113, and converts the remaining portion of the signal to the FFT unit b1115. Output to.
The FFT unit b1115 performs fast Fourier transform on the signal input from the GI removal unit b1114, performs OFDM demodulation, and outputs the result to the demultiplexing unit b112.

The demultiplexing unit b112 demultiplexes the signal demodulated by the FFT unit b1115 into a downlink control channel signal and control information indicator and a downlink shared data channel signal according to the control signal input from the control unit b12. .
Specifically, the demultiplexing unit b112 includes a resource element signal (downlink control channel signal and control information indicator) in which the downlink control channel element is arranged, and a resource element in which the downlink shared data channel is arranged. Signals (downlink shared data channel signals) are separated.
Although illustration and description are omitted here, the control unit b12 controls the demultiplexing unit b112 based on the number of OFDM symbols of the downlink control channel indicated in the received control format indicator channel. The control information indicator and the downlink control channel are multiplexed in the same OFDM symbol.

The demultiplexing unit b112 outputs the separated downlink shared data channel signal to the channel compensation unit b114, and outputs the separated downlink control channel signal and the control information indicator to the channel compensation unit b118.
Further, the demultiplexing unit b112 demultiplexes resource elements in which the downlink pilot channel is arranged, and outputs a downlink pilot channel signal to the channel estimation unit b113.

The channel estimation unit b113 estimates the channel condition using the downlink pilot channel signal (reference signal) separated by the demultiplexing unit b112 and a known reference signal, and compensates for channel fluctuation so that the amplitude and phase are compensated. Is output to the channel compensation unit b114 and the channel compensation unit b118. This control signal is output for each subcarrier.

The channel compensation unit b114 adjusts the amplitude and phase of the downlink shared data channel signal separated by the demultiplexing unit b112 for each subcarrier according to the control signal from the channel estimation unit b113. The channel compensation unit b114 outputs the adjusted signal to the P / S unit b115.
The P / S unit b115 converts the parallel signal sequence adjusted by the channel compensation unit b114 into a serial signal sequence, and outputs the serial signal sequence to the data demodulation unit b116.

The data demodulation unit b116 demodulates the downlink shared data channel signal converted by the P / S unit b115, and outputs the demodulated downlink shared data channel signal to the turbo decoding unit b117. This demodulation is demodulation corresponding to the modulation method used in the data modulation unit a1412 of the base station apparatus a1.
For example, when the Chase Combining method is used as the hybrid automatic repeat HARQ (Hybrid Automatic Repeat reQuest), the data demodulator b116 uses a data channel in which an error is detected and a retransmitted data channel. Perform synthesis.

The turbo decoding unit b117 decodes the information data from the demodulated downlink shared data channel signal input from the data demodulation unit b116. Further, for example, when the incremental redundancy (Incremental Redundancy) method is used as the hybrid automatic retransmission HARQ, the turbo decoding unit b117 detects the downlink shared data channel in which the error is detected and the retransmitted downlink shared data channel, Is combined.

The channel compensation unit b118 adjusts the amplitude and phase of the downlink control channel signal and the control information indicator separated by the demultiplexing unit b112 according to the information from the channel estimation unit b113. The channel compensation unit b118 outputs the adjusted signal to the CCE reconstruction unit b119.

The CCE reconfiguration unit b119 includes a block deinterleaver that performs reverse processing of the block interleaver of the base station apparatus a1, and performs deinterleaving in units of resource element groups. The CCE reconfiguration unit b119 reconfigures one control channel element by using nine consecutive resource element groups having the numbers subjected to deinterleaving.
The CCE reconfiguration unit b119 outputs the signals arranged in all the control channel elements in the reconfigured subband to the control information indicator detection unit b120 and the CCE selection unit b1221 in the order of decreasing control channel element index. .

The control information indicator detection unit b120 selects a mobile station individual search band based on a starting point number t1 input from a start CCE selection unit b121 described later, and outputs a signal of a control channel element in the selected mobile station individual search band. The control information indicator is detected by decoding.

Hereinafter, the process of the control information indicator detection part b120 is demonstrated concretely.
The control information indicator detection unit b120 selects a control channel element having consecutive numbers as a mobile station individual search band from a start point number t1 input from a start CCE selection unit b121 described later.
The control information indicator detection unit b120 is a signal input from the CCE reconfiguration unit b119, and is arranged in order for each CCE set number shown in FIG. QPSK demodulation and Viterbi decoding are performed in units of control channel elements for each number of CCE sets, and then the following CRC check is performed. Control information indicator detection section b120 performs Viterbi decoding at a fixed coding rate for each number of CCE sets.

The control information indicator detection unit b120 performs reverse processing of the processing performed by the control information indicator generation unit a143 of the base station device a1 on the bit sequence subjected to Viterbi decoding, using the mobile station identifier of the own device. . In this process, if an error is detected, the control information indicator detection unit b120 continues to detect the control information indicator in other control channel elements in the mobile station individual search band.

On the other hand, if no error is detected in this process, the control information indicator detection unit b120 detects a bit sequence excluding the CRC code.
When all the bit sequences excluding the CRC code are “1”, the control information indicator detection unit b120 determines that a control information indicator indicating that there is control data specific to the own device has been detected, and the CCE selection unit b1221 A control signal indicating that decoding processing of the downlink control channel is started is output.
The control information indicator detection unit b120, together with this control signal, the number of the control channel element that detected the control information indicator, the information indicating the range of the control channel element in the mobile station individual search band, and the CCE set that detected the control information indicator The information indicating the number is output.

On the other hand, when all the bit sequences except for the CRC code are not “1”, the control information indicator detection unit b120 determines that the control information indicator indicating that there is control data specific to the own device is not detected, The control information indicator detection process is continued in the other control channel elements in the search band.

The start CCE selection unit b121 inputs its own mobile station identifier to the hash function f, and uses the control channel element index t1 that is the output result as the start point number of the control channel element that starts decoding the downlink control channel. Select as.
The start CCE selection unit b121 outputs a start point number t1 as a selection result to the control information indicator detection unit b120.

When a control signal indicating that the downlink control channel decoding process is started is input from the control information indicator detection unit b120, the control channel decoding unit b122 receives a signal input from the CCE reconfiguration unit b119 as follows. The brute force decoding process is performed, and the control data addressed to the own apparatus is decoded. The control channel decoding unit b122 does not perform the brute force decoding process when the control signal indicating that the downlink control channel decoding process is started is not input from the control information indicator detection unit b120.

The CCE selection unit b1221 of the control channel decoding unit b122 selects the mobile station individual search band based on the information indicating the range of the control channel element of the mobile station individual search band input from the control information indicator detection unit b120.
Next, the CCE selection unit b1221 selects control channel elements subsequent to the number of the control channel element that has detected the control information indicator input from the control information indicator detection unit b120 within the selected mobile station individual search band. select.
Next, the CCE selection unit b1221 sequentially selects the signal of the selected control channel element in accordance with the number of CCE sets detected from the control information indicator input from the control information indicator detection unit b120, and outputs the selected signal to the QPSK demodulation unit b1222.

The QPSK demodulation unit b1222 performs QPSK demodulation on the control channel element signals of the number of CCE sets input from the CCE selection unit b1221, and outputs the result to the Viterbi decoder unit b1223.

The Viterbi decoder unit b1223 for each of the control data candidates notified in advance from the base station apparatus a1, for the signal demodulated by the QPSK demodulator unit b1222 so as to decode the candidate control data, A brute force decoding process is performed. Here, the Viterbi decoder b1223 decodes the signal demodulated by the QPSK demodulator b1222 based on the coding rate input from the controller b12.

The Viterbi decoder unit b1223 outputs the decoded signal to the CRC check unit b1224. Here, this signal is expressed in units of bits, and the Viterbi decoder unit b1223 performs rate control in order to adjust the number of bits for performing Viterbi decoding processing on the input bits in accordance with the coding rate instruction from the control unit b12. Dematching is also performed. The Viterbi decoder b1223 performs rate dematching of different processes for control data formats with different amounts of control data.

The CRC checking unit b1224 performs a CRC check on the bit sequence decoded by the Viterbi decoder unit b1223. The CRC checking unit b1224 determines whether or not an error is detected by the CRC check.
Specifically, the mobile station identifier is arranged in the control data as check information combined with a cyclic redundancy check CRC code for error detection. As described above, the base station device a1 generates a CRC code from the control data using a predetermined generator polynomial, and is exclusive of the mobile station identifier of the mobile station device b1 that is the destination of the control data. The inspection information obtained by the logical sum is arranged in the downlink control channel.
The CRC checking unit b1224 performs reverse processing of the operation on the control data using the mobile station identifier of the own device, thereby determining whether the control data is addressed to the own device together with error detection.

If the CRC checking unit b1224 determines that no error is detected, it is assumed that the bit sequence is control data addressed to the own apparatus that can be received without error. On the other hand, if the CRC checker b1224 determines that an error has been detected, it is assumed that the bit sequence is not control data addressed to itself.
The CRC inspection unit b1224 outputs control data, which is control data addressed to its own device, to the control unit b12.

The control unit b12 controls the demultiplexing unit b112, the data demodulation unit b116, the turbo decoding unit b117, and the transmission processing unit b13 based on the information included in the control data input from the CRC checking unit b1224. The reception processing of the downlink shared data channel addressed to its own device is performed.
As described above, this control data includes radio resource allocation information, modulation scheme / coding rate, retransmission parameters, and the like. Also, the control unit b12 ends the downlink control channel decoding process when the CRC check unit b1224 detects the control data addressed to itself and identifies the control channel element including the control data addressed to itself. Let

Hereinafter, a specific example of the control information indicator and downlink control channel detection process according to the present embodiment will be described with reference to FIG. In this specific example, the number of control channel elements constituting the mobile station individual search band is “8”.
FIG. 11 is a diagram for explaining an example of control information indicator and downlink control channel detection processing according to the present embodiment.

This figure shows a case where the control information indicator detection unit b120 inputs its own mobile station identifier to the hash function f and selects the control channel element index “31” as the output result as the start point number. .
This figure also shows that the control information indicator detection unit b120 has selected “8” consecutive control channel elements CCE31 to CCE38 as the mobile station individual search band from the starting point number “31”. .
This figure also shows that the control information indicator detection unit b120 uses the control channel elements of the CCE 33 and the CCE 34 that are hatched in the decoding process of the control channel elements with the number of CCE aggregation “2” in the selected mobile station individual search band. Indicates that a control information indicator has been detected. Note that the control information indicator detection unit b120 does not detect the control information indicator in the mobile station individual search band when the number of CCE sets is two, and within the mobile station individual search band in the case of other numbers of CCE sets. In the same manner, the control information indicator is detected.

In this case, the CCE selection unit b1221 controls the control channel element in which the control information indicator detection unit b120 detects the control information indicator in the mobile station individual search band (CE31 to CCE38) in which the control information indicator detection unit b120 has detected the control information indicator. Control channel elements (CCE35 to CCE38) subsequent to the number (CCE33 and CCE34) are selected.
Next, the CCE selection unit b1221 transmits the signals of the selected control channel elements (CCE35 to CCE38) in order of the number of CCE sets “2” from which the control information indicator detection unit b120 has detected the control information indicator, that is, with the CCE35. The control channel elements of the CCE 36 and then the control channel elements of the CCE 37 and CCE 38 are selected and output to the QPSK demodulator b1222.
Note that the signal output to the QPSK demodulator b1222 and demodulated is subjected to a decoding process (brute force decoding process) for each control data candidate in the Viterbi decoder b1223.

Hereinafter, the operation of the wireless communication system 1 will be described with reference to FIGS. 12 and 13.
FIG. 12 is a flowchart showing an example of the downlink control channel multiplexing processing according to the present embodiment.

(Step S101) The transmission processing unit a14 of the base station apparatus a1 selects the start point number t1 based on the mobile station identifier of the mobile station apparatus b1 that is the transmission destination of the control information indicator. Thereafter, the process proceeds to step S102.

(Step S102) The transmission processing unit a14 selects a mobile station individual search band based on the selected starting point number t1, and multiplexes the control information indicator on the control channel element in the selected mobile station individual search band. Thereafter, the process proceeds to step S103.

(Step S103) The transmission processing unit a14 multiplexes the downlink control channel signal with the other control channel elements in the selected mobile station individual search band.

FIG. 13 is a flowchart showing an example of a downlink control channel detection process according to the present embodiment.
(Step S201) The reception processing unit b11 of the mobile station apparatus b1 selects the start point number t1 based on the mobile station identifier of the own apparatus. Thereafter, the process proceeds to step S202.

(Step S202) The reception processing unit b11 selects a mobile station individual search band based on the selected start point number t1, and controls the signal multiplexed on the control channel element in the selected mobile station individual search band. Decodes the information indicator. Thereafter, the process proceeds to step S203.

(Step S203) As a result of the decoding process, the reception processing unit b11 determines whether or not a control information indicator indicating that there is control data specific to the own apparatus has been detected. Thereafter, the process proceeds to step S204.
If it is determined that the reception processing unit b11 has detected a control information indicator indicating that there is control data specific to its own device, the process proceeds to step S205. On the other hand, if it is determined that the reception processing unit b11 has not detected a control information indicator indicating that there is control data specific to its own device, the process proceeds to step S204.

(Step S204) The reception processing unit b11 further determines whether or not the control information indicator detection processing has been performed for all control channel elements in the mobile station individual search band.
When the reception processing unit b11 determines that the control information indicator detection processing has been performed on all control channel elements in the mobile station individual search band, the operation ends. On the other hand, when the reception processing unit b11 determines that the control information indicator detection process is not performed for all control channel elements in the mobile station individual search band, the process returns to step S202.

(Step S205) The reception processing unit b11 detects a downlink control channel using other control channel elements in the mobile station individual search band. Thereafter, the process proceeds to step S206.

(Step S206) The reception processing unit b11 determines whether a downlink control channel specific to the own device has been detected.
When it is determined that the reception processing unit b11 has detected a downlink control channel specific to the own device, the operation ends. On the other hand, when it is determined that the reception processing unit b11 has not detected a downlink control channel specific to the own device, the process proceeds to step S207.

(Step S207) The reception processing unit b11 further determines whether or not downlink control channel detection processing has been performed for all other control channel elements in the mobile station individual search band.
When the reception processing unit b11 determines that the downlink control channel detection processing has been performed on all control channel elements, the operation ends. On the other hand, when the reception processing unit b11 determines that the downlink control channel detection processing is not performed for all the control channel elements, the process returns to step S205.

Thus, according to the present embodiment, when the base station apparatus a1 has control data addressed to the mobile station apparatus b1, the wireless communication system 1 performs control indicating that there is control data specific to the mobile station apparatus b1. When an information indicator is transmitted and the mobile station apparatus b1 detects a control information indicator indicating that there is control data specific to itself, for each of a plurality of types of control data candidates for a downlink control channel signal When the decoding process (round robin decoding process) is performed and no control information indicator indicating that there is control data specific to the own apparatus is detected, the decoding process is not performed on the downlink control channel signal. It is possible to reduce the number of downlink channel signal decoding processing, which is more expensive than information indicator detection processing, and to reduce the load on the receiving device. Door can be.

In addition, since the mobile station apparatus b1 can reduce the number of times the downlink control channel signal is decoded, the radio communication system 1 increases the types of control data format of the control data, and the downlink control channel signal. Even if the load of the decoding process increases, it is possible to prevent the load from being significantly increased in the receiving apparatus.

In this embodiment, the bit sequence of the control information indicator is all “1”, but the present invention is not limited to this, and the same bit sequence is used in the base station apparatus a1 and the mobile station apparatus b1. Other bit sequences may be used.

In the present embodiment, the base station apparatus a1 performs a convolutional coding and a QPSK modulation on information with the generated check information added to the generated bit sequence, and generates a control information indicator. Although described, the present invention is not limited to this, and a signal using another generation method may be used.
For example, the base station device a1 multiplies the information obtained by adding the generated check information to the generated bit sequence by a QPSK-modulated signal by the scrambling code of the mobile station device b1, and provides a control information indicator. May be generated. In this case, the mobile station apparatus b1 determines that the control information indicator has been detected when the correlation value exceeds a predetermined threshold using the scrambling code of the own apparatus for the signal of the control channel element. It may be. Note that BPSK modulation may be used instead of QPSK modulation.

Further, in the present embodiment, the base station apparatus a1 has a CCE set of control channel elements having a control channel element index larger than the control channel element of the CCE set in which the selected control information indicator is arranged in the selected mobile station individual search band. Thus, a case has been described in which a CCE set in which a downlink control channel signal is arranged is freely selected. However, the present invention is not limited to this, and the relative relationship between the control channel element in which the control information indicator is arranged and the control channel element in which the signal of the downlink control channel including the individual control data of the mobile station apparatus b1 is arranged. The basic relationship may be determined in advance between the base station apparatus a1 and the mobile station apparatus b1. For example, the control channel element in which the control information indicator is arranged may be limited in advance so that the downlink control channel signal is arranged in the control channel element of the next control channel element index.

(Second Embodiment)
Hereinafter, a second embodiment of the present invention will be described in detail with reference to the drawings. In the wireless communication system 1 of the first embodiment, when there is control data addressed to the mobile station device b1, the base station device a1 generates a control information indicator indicating that there is control data specific to the mobile station device b1. . In the wireless communication system of the present embodiment, the base station apparatus indicates that there is individual control data for the mobile station apparatus b1, and information indicating a control channel element in which a signal including control data for each mobile station apparatus is arranged ( A control information indicator including the minimum number band information) is generated.
The overall image of the wireless communication system according to this embodiment is the same as that of the first embodiment (FIG. 1). Hereinafter, the base station device A1 is referred to as a base station device a2, and the mobile station devices B1 and B2 are referred to as a mobile station device b2.

Hereinafter, the configuration of the base station apparatus a2 according to the present embodiment will be described with reference to FIGS.
FIG. 14 is a schematic block diagram showing the configuration of the base station apparatus a2 according to the second embodiment of the present invention. When the base station apparatus a2 (FIG. 14) according to the present embodiment is compared with the base station apparatus a1 (FIG. 7) according to the first embodiment, the radio resource control unit a22, the control unit a23, and the transmission processing unit a24 are different. However, the functions of the other components (reception processing unit a11) are the same as in the first embodiment, and thus the description of the same functions as in the first embodiment is omitted.

The radio resource control unit a22 includes radio resources including transmission power, intermittent transmission / reception cycle, CQI, signal transmission cycle, downlink shared data channel, uplink shared data channel modulation scheme / coding rate, and the like of each mobile station apparatus b2. Manage control information. The radio resource control unit a22 outputs the radio resource control information to the control unit a23.

Further, the radio resource control unit a22 schedules radio resource allocation of the downlink control channel to the mobile station apparatus b2. Also, the radio resource control unit a22 determines the coding rate of the downlink control channel.
Further, the radio resource control unit a22 arranges a mobile station identifier of the mobile station apparatus b2 to which radio resources are allocated, control information including the determined coding rate, and a control channel in which a signal including control data specific to the mobile station apparatus b2 is arranged. The control channel element index of the element (hereinafter referred to as individual information control channel element number c) is output to the control unit a23.

The control unit a23 determines the number of control channel elements (the number of CCE sets) of the downlink control channel to be allocated to the mobile station device b2 based on the coding rate of the downlink control channel input from the radio resource control unit a22.
The control unit a23 receives information on the control information input from the radio resource control unit a22, the radio resource control information, the determined number of CCE sets, and the mobile station identifier of the mobile station device b2 to which the downlink control channel is allocated. It is included in the control signal for controlling the transmission processing unit a24 generated based on the information, and is output to the transmission processing unit a24.

In addition, when there is control data specific to the mobile station device b2 to which the downlink control channel is allocated or a combination thereof (specific control information addressed to the mobile station device b2), the control unit a23 has control data specific to the mobile station device b2. The transmission processing unit a24 is controlled so as to generate a control information indicator indicating.
In addition, the control unit a23 outputs the individual information control channel element number c input from the radio resource control unit a22 to the transmission processing unit a24.

Moreover, the control part a23 produces | generates the control channel information transmitted using the downlink control channel about the mobile station apparatus b2 which allocates a downlink control channel.
Next, the control unit a23 generates a CRC code by using a predetermined generator polynomial for the generated control channel information, and assigns the generated CRC code and the mobile station identifier of the mobile station apparatus b2 to which the downlink control channel is allocated. Generate inspection information obtained by exclusive OR.
The control unit a23 generates control data according to the control data format from the generated control channel information and the generated inspection information.
The control unit a23 outputs the generated control data or a plurality of control data (control data or a combination thereof) to the transmission processing unit a24.

Also, the control unit a23 controls the radio resource allocation, the modulation scheme, and the coding rate of the downlink shared data channel based on the control information and the radio resource control information input from the radio resource control unit a22, and the transmission processing unit a24. To. The control unit a23 controls the reception processing unit a11.
Details of the transmission processing unit a24 will be described below.

FIG. 15 is a schematic block diagram illustrating a configuration of the transmission processing unit a24 according to the present embodiment. When the transmission processing unit a24 (FIG. 15) according to this embodiment is compared with the transmission processing unit a14 (FIG. 7) according to the first embodiment, the control information indicator generation unit a243 and the CCE aggregation processing unit a244 are different. However, other components (a plurality of downlink shared data channel processing units a141-1 to a141-m, a plurality of downlink control channel processing units a142-1 to a142-n, a pilot channel processing unit a145, a multiplexing unit a146, The functions of the transmission units a147-1, a147-2 and transmission antennas a148-1, a148-2) are the same as those of the first embodiment, and thus the description of the same functions as those of the first embodiment is omitted. .

The control information indicator generation unit a243 generates a bit sequence (minimum number band information) indicating the individual information control channel element number c input from the control unit a23 after the bit sequence in which all the predetermined number of bits indicate “1”. An added bit sequence is generated.
For example, the control information indicator generation unit a243 generates the bit sequence indicating the individual information control channel element number c1 input from the control unit a23 after the bit sequence in which all the predetermined number of bits indicate “1”. . Here, it is assumed that the number of bits of the bit sequence is predetermined.

The control information indicator generation unit a243 generates a CRC code using a generator polynomial determined in advance for the generated bit sequence.
Next, the control information indicator generation unit a243 generates check information obtained by performing an exclusive OR of the generated CRC code and the mobile station identifier of the mobile station device b2 that is the transmission destination of the control information indicator.

The control information indicator generation unit a243 performs convolutional coding and QPSK modulation on the information obtained by adding the generated check information to the generated bit sequence, and generates a control information indicator.
The control information indicator generation unit a243 outputs the generated control information indicator to the CCE set processing unit a244.

The CCE set processing unit a244 generates control information generated by the control information indicator generating unit a243 based on the mobile station identifier of the mobile station device b2 indicated by the control signal and the number of CCE sets in accordance with the control signal input from the control unit a23. Select the control channel element to place the indicator.
Also, the CCE aggregation processing unit a244 selects a control channel element in which a downlink control channel signal including individual control data of the mobile station device b2 input from the control unit a23 is selected, and the S / P unit a1423 outputs A downlink control channel signal is arranged.
A specific example of the process of selecting a control channel element performed by the CCE aggregation processing unit a244 will be described later together with a specific example of the downlink control channel detection process in the mobile station apparatus b2. The CCE set processing unit a244 and the multiplexing unit a146 are referred to as a control information indicator signal arrangement unit A200.

Hereinafter, the configuration of the mobile station apparatus b2 according to the present embodiment will be described with reference to FIG. Note that the configuration of the mobile station apparatus b2 according to the present embodiment is the same as that in FIG. 10, and the functions of the reception processing unit b21 described later are different. However, since the functions of other components (the control unit b12 and the transmission processing unit b13) are the same as those in the first embodiment, the description of the same functions as those in the first embodiment is omitted.

FIG. 16 is a schematic block diagram illustrating a configuration of the reception processing unit b21 according to the present embodiment. When the reception processing unit b21 (FIG. 16) according to the present embodiment is compared with the reception processing unit b11 (FIG. 11) according to the first embodiment, the control information indicator detection unit b220 and the CCE selection unit b2221 are different. However, other components (receiving unit b111, demultiplexing unit b112, channel estimation unit b113, downlink shared data channel channel compensation unit b114, P / S unit b115, data demodulation unit b116, turbo decoding unit b117, control The functions of the channel compensation unit b118, CCE reconfiguration unit b119, start CCE selection unit b1221, QPSK demodulation unit b1222, Viterbi decoder unit b1223, and CRC check unit b1224) for the information indicator and downlink control channel are the first Since it is the same as that of the embodiment, the description of the same function as that of the first embodiment is omitted.

The control information indicator detection unit b220 selects the mobile station individual search band based on the start point number t2 input from the start CCE selection unit b121, and decodes the signal of the control channel element in the selected mobile station individual search band. Then, the control information indicator is detected.

Hereinafter, the process of the control information indicator detection part b220 is demonstrated concretely.
The control information indicator detection unit b220 selects a control channel element having consecutive numbers as a mobile station individual search band from the start point number t2 input from the start CCE selection unit b121.
The control information indicator detection unit b220 is a signal input from the CCE reconfiguration unit b119, and is arranged in order for each CCE set number shown in FIG. QPSK demodulation and Viterbi decoding are performed in units of control channel elements for each number of CCE sets, and then a CRC check is performed. Control information indicator detection section b220 performs Viterbi decoding at a fixed coding rate for each number of CCE sets.

The control information indicator detection unit b220 performs reverse processing of the processing performed by the control information indicator generation unit a243 of the base station device a2 on the bit sequence subjected to Viterbi decoding, using the mobile station identifier of the own device. . In this process, when an error is detected, the control information indicator detection unit b220 continues to detect the control information indicator in other control channel elements in the mobile station individual search band.

On the other hand, when no error is detected in this process, the control information indicator detection unit b220 detects a bit sequence excluding the CRC code. The control information indicator detection unit b220 determines that there is a signal including control data specific to its own device when the first predetermined number of bits in the bit sequence excluding the CRC code is all “1”. Then, a control signal indicating that the downlink control channel decoding process is started is output to the CCE selection unit b2221.

Further, the control information indicator detection unit b220 detects the individual information control channel element number c1 from the bit after the predetermined number of bits.
The control information indicator detection unit b220 includes a control signal indicating that the downlink control channel decoding process is started, information indicating the detected control channel element index, the number of CCE sets from which the control information indicator is detected, and individual information control The channel element number c1 is output to the CCE selection unit b2221.

The CCE selection unit b2221 selects the control channel element having the individual information control channel element number c1 input from the control information indicator detection unit b220. The CCE selection unit b2221 selects, for the selected control channel element, the control channel elements corresponding to the number of CCE sets from which the control information indicator input from the control information indicator detection unit b220 is detected, and outputs the selected control channel element to the QPSK demodulation unit b1222.

Hereinafter, a specific example of the control information indicator and the downlink control channel detection process according to the present embodiment will be described with reference to FIG. In this specific example, the number of control channel elements constituting the mobile station individual search band is “8”, and the number of CCE aggregates used for one downlink control channel signal in the multiplexing process is “2”. To do.

FIG. 17 is a diagram illustrating an example of downlink control channel multiplexing processing and detection processing according to the present embodiment.

First, the multiplexing process in the base station device a2 will be described.
This figure shows that the individual information control channel element number “71” is input from the control unit a23 to the CCE aggregation processing unit a244 via the control information indicator generation unit a243, and the CCE aggregation processing unit a244 receives the individual information control channel element. This indicates that the control channel elements with numbers “71” and “72” are selected as control channel elements for arranging signals including individual control data of the mobile station apparatus b2.
In this case, the control information indicator generation unit a243 generates a bit sequence in which the individual information control channel element number “71” is added as a bit sequence after a bit sequence in which a predetermined number of bits all indicate “1”. The control information indicator generation unit a243 generates the control information indicator as described above from the generated bit sequence.

This figure shows a case where the CCE set processing unit a244 inputs the mobile station identifier to the hash function f and selects the control channel element index “31” as the output result as the start point number. Note that the control channel element whose start point number is “31” is the CCE 31, and the CCE 31 is a control channel element constituting the subband 2 in FIG. 5.

This figure shows that the CCE set processing unit a244 selects “8” control channel elements CCE31 to CCE38 having consecutive numbers from the starting point number “31” as mobile station individual search bands. This figure shows that the CCE set processing unit a244 has selected the control channel elements of the control channel element indexes “33” and “34” of the CCE set 2 as control channel elements for arranging the control information indicators.
In this case, the multiplexing unit a146 arranges the control information indicator generated by the control information indicator generating unit a243 in the control channel elements of the control channel element indexes “33” and “34”. In addition, the multiplexing unit a146 arranges a signal including control data specific to the mobile station apparatus b2 in the individual information control channel element number “71” and the control channel element whose control channel element number is “72” next.

Next, the decoding process in the mobile station apparatus b2 will be described.
The control information indicator detection unit b220 performs the same process as described in the first embodiment, selects the mobile station individual search bands CCE31 to CCE38, and selects the control channel element indexes “33” and “34”. Detecting the control information indicator.
The control information indicator detection unit b220 detects the individual information control channel element number “71” from the detected control information indicator, and detects the detected individual information control channel element number “71” and the CCE set from which the control information indicator is detected. The number “2” is output to the CCE selection unit b2221.

The CCE selection unit b2221 detects the control information indicator input from the control information indicator detection unit b220 from the control channel element of the individual information control channel element number “71” detected by the control information indicator detection unit b220 “ 2 "control channel elements (CCE71 and CCE72) are selected and output to the QPSK demodulator b1222.

<Modification 1>
The radio communication system 2 uses a plurality of control channel elements instead of information (individual information control channel element number c) indicating control channel elements in which signals including control data specific to the mobile station apparatus b2 are arranged in the control information indicator. Information indicating a control channel element set (band element set) may be included.

FIG. 18 is a diagram for explaining a configuration of a control channel element set including a plurality of control channel elements according to the first modification.
This figure shows that one control channel element set (referred to as “set” in the description of FIG. 18) is composed of four control channel elements.
This figure shows that the control channel elements in the system band are composed of 25 control channel element sets.

For example, control channel element set 1 is CCE 1 to 4, control channel element set 2 is CCE 5 to 8, control channel element set 3 is CCE 9 to 12, control channel element set 4 is CCE 13 to 16, control channel element set 5 is CCE 17 to 20, control channel element set 6 is CCE 21 to 24, control channel element set 7 is CCE 25 to 28, control channel element set 8 is CCE 29 to 32, control channel element set 9 is CCE 33 to 36, and control channel element set 10 is CCE 37 to 40, the control channel element set 11 is CCE 41 to 44, the control channel element set 12 is CCE 45 to 48, the control channel element set 13 is CCE 49 to 52, the control channel Control element set 14 is CCE 53 to 56, control channel element set 15 is CCE 57 to 60, control channel element set 16 is CCE 61 to 64, control channel element set 17 is CCE 65 to 68, control channel element set 18 is CCE 69 to 72, control The channel element set 19 is CCE 73 to 76, the control channel element set 20 is CCE 77 to 80, the control channel element set 21 is CCE 81 to 84, the control channel element set 22 is CCE 85 to 88, the control channel element set 23 is CCE 89 to 93, control The channel element set 24 includes CCEs 94 to 96, and the control channel element set 25 includes CCEs 97 to 100.

The control information indicator generation unit a243 of the base station apparatus a2 includes a control channel element set number (hereinafter referred to as an individual information control channel element set number d) including the control channel element of the individual information control channel element number c input from the control unit a23. Select). The control information indicator generation unit a243 generates a control information indicator from a bit sequence obtained by adding a bit sequence indicating the selected individual information control channel element set number d to a bit sequence in which a predetermined number of bits all indicate “1”. Generate.

In this case, the control information indicator detection unit b220 of the mobile station apparatus b2 performs the same process as described in the second embodiment, and detects the individual information control channel element set number d from the control information indicator.
The control information indicator detection unit b220, when no error is detected in this process, together with the detected individual information control channel element set number d and the control information indicating that the decoding process of the downlink control channel is started Information indicating the number of CCE sets in which the indicator is detected is output to the CCE selection unit b2221.

The CCE selection unit b2221 selects a control channel element included in the individual information control channel element set number d input from the control information indicator detection unit b220. The CCE selection unit b2221 selects the control information elements input from the control information indicator detection unit b220 for the selected control channel element in order of the number of detected CCE sets, and outputs the selected control channel elements to the QPSK demodulation unit b1222.

Hereinafter, a specific example of the control information indicator and the downlink control channel detection process according to the first modification will be described with reference to FIG. In this specific example, the number of control channel elements constituting the mobile station individual search band is “8”, and the number of CCE aggregates used for one downlink control channel signal in the multiplexing process is “2”. To do.

First, the multiplexing process in the base station device a2 will be described.
For example, the radio resource control unit a22 of the base station apparatus a2 selects the individual information control channel element number “89”, and assigns the individual information control channel element number “89” to the control information indicator generation unit a243 via the control unit a23. Output to.

The control information indicator generation unit a243 selects the individual information control channel element set number “23” including the individual information control channel element number “89” input from the control unit a23. The control information indicator generation unit a243 generates a bit sequence that is added after a bit sequence in which a predetermined number of bits all indicate “1” using the selected individual information control channel element set number “23” as a bit sequence. The control information indicator generation unit a243 generates the control information indicator as described above from the generated bit sequence.

The CCE aggregation processing unit a244 performs the same processing as that described in the second embodiment, “31” as the starting point number, CCE31 to CCE38 as control channel elements of the mobile station individual search band, and the control Control channel elements having control channel element indexes “33” and “34” are selected as control channel elements in which the information indicator is arranged.
In this case, the multiplexing unit a146 arranges the control information indicator generated by the control information indicator generating unit a243 in the control channel elements of the control channel element indexes “33” and “34”, and the individual information control channel element number “ A signal including control data specific to the mobile station apparatus b2 is arranged in a control channel element having the control channel element number "90" and the next "90".

Next, the decoding process in the mobile station apparatus b2 will be described.
The control information indicator detection unit b220 performs the same process as that described in the second embodiment, selects the mobile station individual search bands CCE31 to CCE38, and sets the individual information control channel element set numbers “33” and “33”. The control information indicator is detected from the control channel element 34.
The control information indicator detection unit b220 detects the individual information control channel element set number “23” from the detected control information indicator, and detects the detected individual information control channel element set number “23” and the control information indicator. The set number “2” is output to the CCE selection unit b2221.

The CCE selection unit b2221 detects the control information indicator input from the control information indicator detection unit b220 for the control channel elements CCE89 to CCE92 of the individual information control channel element set number “23” detected by the control information indicator detection unit b220. The number of CCE sets “2” is sequentially selected and output to the QPSK demodulator b1222.

The QPSK demodulation unit b1222 performs QPSK demodulation on the signals of the control channel elements CCE89 and 90 input from the CCE selection unit b2221, and performs downlink control channel processing by the processing of the Viterbi decoder unit b1223 and the processing of the CRC check unit b1224. Detect control data. If no control data of the downlink control channel is detected for the CCE 89 and 90 signals, the same processing is performed on the CCE 91 and 92 signals.

Thereby, the mobile station apparatus b2 performs processing performed by the control channel decoding unit b222 as compared with the case where the control information indicator including information indicating the control channel element in which the signal including the control data specific to the mobile station apparatus b2 is arranged. Although increasing, the amount of data included in the control information indicator can be reduced.

<Modification 2>
Hereinafter, another modification will be described. The wireless communication system 2 uses a control information indicator, not an individual information control channel element number, but a number of a control channel element that multiplexes the control information indicator (hereinafter referred to as an indicator control channel element e) and an individual information control channel element number c. And information indicating the difference (hereinafter referred to as relative number difference 1).

Similarly to the CCE set processing unit a244, the radio resource control unit a22 of the base station device a2 has the hash function f, the mobile station identifier of the mobile station device b2 to which the radio resource is allocated, and the number of CCE sets determined by the control unit a23. The control channel element in which the control information indicator is arranged is selected based on the above. The radio resource control unit a22 sends the control channel element number (hereinafter referred to as the indicator control channel element number i) starting the arrangement of the selected control information indicator and the individual information control channel element number c via the control unit a23. To the control information indicator generation unit a243.

The control information indicator generating unit a243 calculates a relative number difference 1 which is a difference between the individual information control channel element number c input from the control unit a23 and the indicator control channel element number i.
The control information indicator generation unit a243 generates a control information indicator from a bit sequence obtained by adding a bit sequence indicating a selected relative number difference 1 after a bit sequence in which all of a predetermined number of bits indicate “1”.

In this case, the control information indicator detection unit b220 of the mobile station apparatus b2 performs the same process as described in the second embodiment, and detects the relative number difference 1 from the control information indicator.
When no error is detected in this process, the control information indicator detection unit b220 arranges the detected relative number difference 1 and the detected control information indicator together with the control signal indicating that the decoding process of the downlink control channel is started. Information indicating the minimum number (that is, indicator control channel element number i) of the control channel element index of the control channel element that has been set and the number of CCE sets that have detected the control information indicator is output to the CCE selection unit b2221.

The CCE selection unit b2221 adds a number obtained by adding a relative number difference 1 to the indicator control channel element number i input from the control information indicator detection unit b220, and the control channel element index of the control channel element that multiplexes the downlink control channel. The smallest number (that is, the individual information control channel element number c) is calculated.
The CCE selection unit b2221 selects control channel element signals corresponding to the number of CCE sets from which the control information indicator input from the control information indicator detection unit b220 is detected from the calculated control channel element of the individual information control channel element number c. , And output to the QPSK demodulator b1222.

Hereinafter, a specific example of the control information indicator and downlink control channel detection processing according to the second modification will be described with reference to FIG. In this specific example, the number of control channel elements constituting the mobile station individual search band is “8”, and the number of CCE aggregates used for one downlink control channel signal in the multiplexing process is “1”. To do.

First, the multiplexing process in the base station device a2 will be described.
For example, the radio resource control unit a22 of the base station apparatus a2 selects the individual information control channel element number “34”. Also, the radio resource control unit a22 inputs the mobile station identifier to the hash function f, selects the mobile station individual search bands CCE23 to CCE30, and selects the indicator control channel element number “28”.
The radio resource control unit a22 outputs the individual information control channel element number “34” and the indicator control channel element number “28” to the control information indicator generation unit a243 via the control unit a23.

The control information indicator generation unit a243 calculates “6” which is the difference between the individual information control channel element number “34” and the indicator control channel element number “28” as the relative number difference 1.

The control information indicator generating unit a243 generates a bit sequence added after a bit sequence in which a predetermined number of bits all indicate “1”, using the calculated relative number difference 1 “6” as a bit sequence. The control information indicator generation unit a243 generates the control information indicator as described above from the generated bit sequence.

The CCE aggregation processing unit a244 selects the indicator control channel element number “28” input from the radio resource control unit a22 via the control unit a23 as the control channel element in which the control information indicator is arranged.
In this case, the multiplexing unit a146 arranges the control information indicator generated by the control information indicator generating unit a243 in the control channel element of the indicator control channel element number “28”, and also assigns the control information indicator to the individual information control channel element number “34”. , A signal including individual control data of the mobile station apparatus b2 is arranged.

Next, the decoding process in the mobile station apparatus b2 will be described.
The control information indicator detection unit b220 performs the same process as described in the second embodiment, selects the mobile station individual search bands CCE23 to CCE30, and controls the control channel element with the indicator control channel element number “28”. From this, a control information indicator is detected.

The control information indicator detection unit b220 detects the relative number difference 1 “6” from the detected control information indicator, and detects the detected relative number difference 1 “6”, the indicator control channel element number “28”, and the control information indicator. The detected CCE aggregation number “1” is output to the CCE selection unit b2221.

The CCE selection unit b2221 sets the number “34” obtained by adding the relative number difference 1 “6” to the indicator control channel element number “28” input from the control information indicator detection unit b220 as the individual information control channel element number c. calculate.
The CCE selection unit b2221 detects the control information indicator input from the control information indicator detection unit b220 from the control channel element of the calculated control channel element index of the individual information control channel element number c “34” “1” ”Control channel element signals are selected and output to the QPSK demodulator b1222.

<Modification 3>
Hereinafter, another modification will be described. The radio communication system 2 uses the control information indicator as a difference between the control channel element index number of the specific control channel element of the mobile station individual search band and the control channel element that multiplexes the downlink control channel instead of the relative number difference 1. May be included.
Hereinafter, in the radio communication system 2, the difference between the number of control channel elements having the smallest control channel element (that is, the start point number t2) and the individual information control channel element number c (hereinafter, the control channel element in the mobile station individual search band) , Referred to as relative number difference 2).

Similarly to the CCE aggregation processing unit a244, the radio resource control unit a22 of the base station device a2 calculates the start point number t2 based on the hash function f and the mobile station identifier of the mobile station device b2 to which radio resources are allocated. The radio resource control unit a22 outputs the calculated start point number t2 and the individual information control channel element number c to the control information indicator generation unit a243 via the control unit a23.

The control information indicator generation unit a243 calculates a relative number difference 2 that is a difference between the individual information control channel element number c input from the control unit a23 and the start point number t2.
The control information indicator generation unit a243 generates a control information indicator from a bit sequence obtained by adding a bit sequence indicating a selected relative number difference 2 after a bit sequence in which all of a predetermined number of bits indicate “1”.

In this case, the control information indicator detection unit b220 of the mobile station apparatus b2 performs the same process as that described in the second embodiment, and detects the relative number difference 2 from the control information indicator.
The control information indicator detection unit b220, when no error is detected in this process, together with the control signal indicating that the downlink control channel decoding process is started, the detected relative number difference 2, the calculated starting point number t2, And the information which shows the number of CCE sets which detected the control information indicator is output to the CCE selection part b2221.

The CCE selection unit b2221 uses the starting point number t2 input from the control information indicator detection unit b220 and adds a relative number difference 2 to the smallest control channel element index of the control channel elements that multiplex the downlink control channel. (That is, the individual information control channel element number c).
The CCE selection unit b2221 selects control channel element signals corresponding to the number of CCE sets from which the control information indicator input from the control information indicator detection unit b220 is detected from the calculated control channel element of the individual information control channel element number c. , And output to the QPSK demodulator b1222.

Hereinafter, a specific example of the detection process of the control information indicator and the downlink control channel according to the third modification will be described with reference to FIG. In this specific example, the number of control channel elements constituting the mobile station individual search band is “8”, and the number of CCE aggregates used for one downlink control channel signal in the multiplexing process is “1”. To do.

First, the multiplexing process in the base station device a2 will be described.
For example, the radio resource control unit a22 of the base station apparatus a2 selects the individual information control channel element number “40”. Further, the radio resource control unit a22 inputs the mobile station identifier to the hash function f and selects the start point number “30”.
The control information indicator generation unit a243 calculates “10” that is the difference between the individual information control channel element number “40” and the start point number “30” as the relative number difference 2.

The control information indicator generation unit a243 generates a bit sequence added after a bit sequence in which a predetermined number of bits all indicate “1”, using the calculated relative number difference 2 “10” as a bit sequence. The control information indicator generation unit a243 generates the control information indicator as described above from the generated bit sequence.

The CCE aggregation processing unit a244 performs the same processing as that described in the second embodiment, “30” as the starting point number, CCEs 30 to CCE37 as the control channel elements of the mobile station individual search band, and the indicator Select the control channel element number “32”.
In this case, the multiplexing unit a146 arranges the control information indicator generated by the control information indicator generation unit a243 in the indicator control channel element number “32”, and the mobile station apparatus in the individual information control channel element number “40”. b2 A downlink control channel signal including individual control data is arranged.

Next, the decoding process in the mobile station apparatus b2 will be described.
The control information indicator detection unit b220 performs the same process as described in the second embodiment, selects the start point number “30”, the mobile station individual search bands CCE30 to CCE37, and the control channel element index “ 32 ", a control information indicator is detected.

The control information indicator detection unit b220 detects the relative number difference 2 “10” from the detected control information indicator, and detects the detected relative number difference 2 “10”, the start point number “30”, and the control information indicator. The CCE set number “1” is output to the CCE selection unit b2221.

The CCE selection unit b2221 calculates, as the individual information control channel element number c1, a number “40” obtained by adding the relative number difference 2 “10” to the start point number “30” input from the control information indicator detection unit b220. .
The CCE selection unit b2221 controls the number of CCE sets “1” that detected the control information indicator input from the control information indicator detection unit b220 from the control channel element of the calculated control channel element index of the minimum number “40”. The channel element signal is selected and output to the QPSK demodulator b1222.

Thereby, the mobile station apparatus b2 performs processing performed by the control channel decoding unit b222 as compared with the case where the control information indicator including information indicating the control channel element in which the signal including the control data specific to the mobile station apparatus b2 is arranged. Although increasing, the amount of data included in the control information indicator can be reduced.

Thus, according to this embodiment, in the radio communication system 2, the base station apparatus a2 transmits the control information indicator including information indicating the individual information control channel element number c, and the mobile station apparatus b2 The indicator is decoded, the signal of the control channel element of the individual information control channel element number c indicated by the information included in the signal is decoded, and the control data is detected.
Thereby, the radio communication system 2 detects the individual information control channel element number c from the control information indicator when the control information indicator indicates that there is individual control data for the own device, and the individual information control channel element number c Since it is possible to demodulate control channel element signals for the number of CCE sets and detect control channel information, it is possible to reduce the control data decoding process and reduce the load on the receiving apparatus. it can.

(Third embodiment)
Hereinafter, the third embodiment of the present invention will be described in detail with reference to the drawings. In the radio communication system 2 of the second embodiment, the base station device a2 generates a control information indicator including information indicating a control channel element in which a signal including control data specific to the mobile station device b2 is arranged. In the radio communication system according to the present embodiment, the base station apparatus has a subband number (hereinafter referred to as an individual information subband number j) to which a control channel element that arranges a signal including control data for each mobile station apparatus belongs to a control information indicator. ) Is generated as a signal including information (individual control signal subband information).
The overall image of the wireless communication system according to this embodiment is the same as that of the first embodiment (FIG. 1). Hereinafter, the base station apparatus A1 is referred to as a base station apparatus a3, and the mobile station apparatuses B1 and B2 are referred to as a mobile station apparatus b3.

Hereinafter, the configuration of the base station apparatus a3 according to the present embodiment will be described with reference to FIGS.
FIG. 19 is a schematic block diagram showing the configuration of the base station device a3 according to the third embodiment of the present invention. When the base station apparatus a3 (FIG. 19) according to the present embodiment is compared with the base station apparatus a1 (FIG. 7) according to the first embodiment, the radio resource control unit a32, the control unit a33, and the transmission processing unit a34 are different. However, the functions of the other components (reception processing unit a11) are the same as in the first embodiment, and thus the description of the same functions as in the first embodiment is omitted.

The radio resource control unit a32 includes radio resources including transmission power, intermittent transmission / reception cycle, CQI, signal transmission cycle, downlink shared data channel, uplink shared data channel modulation scheme / coding rate, and the like of each mobile station apparatus b3. Manage control information. The radio resource control unit a32 outputs the radio resource control information to the control unit a33.

Further, the radio resource control unit a32 schedules radio resource allocation of the downlink control channel to the mobile station apparatus b3. Also, the radio resource control unit a32 determines the coding rate of the downlink control channel.
Further, the radio resource control unit a32 outputs the mobile station identifier of the mobile station device b3 to which the radio resource is allocated, the control information including the determined coding rate, and the individual information subband number j to the control unit a33.

The control unit a33 determines the number of control channel elements (the number of CCE sets) of the downlink control channel to be allocated to the mobile station device b3 based on the coding rate of the downlink control channel input from the radio resource control unit a32. .
The control unit a33 receives the control information, the radio resource control information, the determined number of CCE aggregations, and the mobile station identifier of the mobile station device b3 to which the downlink control channel is allocated, from the radio resource control unit a32. It is included in a control signal for controlling the transmission processing unit a34 generated based on the information and is output to the transmission processing unit a34.

Further, when there is control data specific to the mobile station device b3 to which the downlink control channel is allocated or a combination thereof (specific control information addressed to the mobile station device b3), the control unit a33 has control data specific to the mobile station device b3. The transmission processing unit a34 is controlled so as to generate a control information indicator indicating
Also, the control unit a33 outputs the individual information subband number j input from the radio resource control unit a32 to the transmission processing unit a34.

Moreover, the control part a33 produces | generates the control channel information transmitted using the downlink control channel about the mobile station apparatus b3 which allocates a downlink control channel.
Next, the control unit a33 generates a CRC code by using a predetermined generation polynomial for the generated control channel information, and assigns the generated CRC code and the mobile station identifier of the mobile station apparatus b3 to which the downlink control channel is allocated. Generate inspection information obtained by exclusive OR.
The control unit a33 generates control data according to the control data format from the generated control channel information and the generated inspection information.
The control unit a33 outputs the generated control data or a plurality of control data (control data or a combination thereof) to the transmission processing unit a34.

Also, the control unit a33 controls the radio resource allocation, the modulation scheme, and the coding rate of the downlink shared data channel based on the control information and the radio resource control information input from the radio resource control unit a32, and the transmission processing unit a34. To. The control unit a33 controls the reception processing unit a11.
Details of the transmission processing unit a34 will be described below.

FIG. 20 is a schematic block diagram illustrating a configuration of the transmission processing unit a34 according to the present embodiment. When the transmission processing unit a34 (FIG. 20) according to the present embodiment is compared with the transmission processing unit a14 (FIG. 7) according to the first embodiment, the control information indicator generation unit a343 and the CCE aggregation processing unit a344 are different. However, other components (a plurality of downlink shared data channel processing units a141-1 to a141-m, a plurality of downlink control channel processing units a142-1 to a142-n, a pilot channel processing unit a145, a multiplexing unit a146, The functions of the transmission units a147-1, a147-2 and transmission antennas a148-1, a148-2) are the same as those of the first embodiment, and thus the description of the same functions as those of the first embodiment is omitted. .

The control information indicator generation unit a343 generates a bit sequence in which a bit sequence indicating the individual information subband number j input from the control unit a33 is added to a bit sequence in which a predetermined number of bits all indicate “1”. . Here, it is assumed that the number of bits of the bit sequence is predetermined.

The control information indicator generation unit a343 generates a CRC code using a generator polynomial determined in advance for the generated bit sequence.
Next, the control information indicator generation unit a343 generates check information obtained by performing an exclusive OR of the generated CRC code and the mobile station identifier of the mobile station device b3 that is the transmission destination of the control information indicator.

The control information indicator generation unit a343 performs convolutional coding and QPSK modulation on the information obtained by adding the generated check information to the generated bit sequence, and generates a control information indicator.
The control information indicator generation unit a343 outputs the generated control information indicator to the CCE set processing unit a344.

The CCE set processing unit a344 generates control information generated by the control information indicator generating unit a343 based on the mobile station identifier of the mobile station device b3 indicated by the control signal and the number of CCE sets in accordance with the control signal input from the control unit a33. Select the control channel element to place the indicator.

Further, the CCE aggregation processing unit a344 inputs the mobile station identifier of the mobile station apparatus b3 to which the downlink control channel is allocated to the predetermined hash function f, and calculates the start point number t3.
The CCE aggregation processing unit a344 is relative to the start point number t3 in the subband of the subband number to which the control channel element that arranges the downlink control channel including the individual control data of the mobile station device b3 input from the control unit a33 belongs. The same number is selected as the relative number r3. Here, the relative number is a number that is the same in the order counted in ascending order of the control channel element index in each subband.

The CCE aggregation processing unit a344 selects the control channel element having the control channel element index r3 as the control channel element for starting the arrangement of the downlink control channel signal output from the S / P unit a1423.
A specific example of the process of selecting a control channel element performed by the CCE aggregation processing unit a344 will be described later together with a specific example of the downlink control channel detection process in the mobile station apparatus b3. The CCE set processing unit a344 and the multiplexing unit a146 are referred to as a control information indicator signal arrangement unit A300.

Hereinafter, the configuration of the mobile station apparatus b3 according to the present embodiment will be described with reference to FIG. The configuration of the mobile station apparatus b3 according to the present embodiment is the same as that in FIG. 16, and the functions of the reception processing unit b31 described later are different. However, since the functions of other components (the control unit b12 and the transmission processing unit b13) are the same as those in the second embodiment, description of the same functions as those in the second embodiment is omitted.

FIG. 21 is a schematic block diagram showing the configuration of the reception processing unit b31 according to this embodiment. When the reception processing unit b31 (FIG. 21) according to the present embodiment is compared with the reception processing unit b21 (FIG. 16) according to the second embodiment, the CCE selection unit b3221 is different. However, other components (receiving unit b111, demultiplexing unit b112, channel estimation unit b113, downlink shared data channel channel compensation unit b114, P / S unit b115, data demodulation unit b116, turbo decoding unit b117, control Channel compensation unit b118 for information indicator and downlink control channel, CCE reconfiguration unit b119, control information indicator detection unit b220, start CCE selection unit b121, QPSK demodulation unit b1222, Viterbi decoder unit b1223, and CRC check unit b1224) Since the functions possessed by are the same as those of the second embodiment, description of the same functions as those of the second embodiment will be omitted.

Here, the control information indicator detection unit b220 has the same function as that of the second embodiment, and in this embodiment, the individual information sub-band is obtained from the bit after a predetermined number of bits of the bit sequence obtained by decoding the control information indicator. The band number j is detected.

The control information indicator detection unit b220, when no error is detected in the control information indicator detection process, together with the control signal indicating that the downlink control channel decoding process is started, the detected individual information subband number j, start Information indicating the start point number t3 input from the CCE selection unit b121 and the number of CCE sets from which the control information indicator has been detected is output to the CCE selection unit b3221.

The CCE selection unit b3221 selects, as the relative number r3, a number having the same relative number as the start point number t3 in the subband of the individual information subband number j input from the control information indicator detection unit b220.
The CCE selection unit b3221 controls the control information input from the control information indicator detection unit b220 from the control channel element of the relative number r3 for the mobile station individual search band in which the selected control channel element of the relative number r3 is regarded as the start point number. The control channel elements corresponding to the number of CCE sets for which the indicators are detected are selected and output to the QPSK demodulator b1222.

Hereinafter, a specific example of the control information indicator and downlink control channel detection processing according to the present embodiment will be described with reference to FIG. In this specific example, the number of control channel elements constituting the mobile station individual search band is “8”, and the number of CCE aggregates used for one downlink control channel signal in the multiplexing process is “2”. To do.

FIG. 22 is a diagram illustrating an example of downlink control channel multiplexing processing and detection processing according to the present embodiment.

First, the multiplex processing in the base station device a3 will be described.
This diagram is an explanatory diagram when the individual information subband number “4” is input from the control unit a33 to the CCE set processing unit a344.
This figure also shows a case where the CCE aggregation processing unit a344 inputs the mobile station identifier to the hash function f and selects the control channel element index “31” as the output result as the start point number. Note that the control channel element whose start point number is “31” is the CCE 31, and the CCE 31 is a control channel element constituting the subband 2 in FIG. 5.

This figure shows that the CCE set processing unit a344 assigns the same relative number to the start point number “31” in the subband of the individual information subband number “4” input from the control unit a33. 71 ”is selected.

This figure also shows that the CCE aggregation processing unit a344 selects “8” control channel elements CCE31 to CCE38 having consecutive numbers from the starting point number “31” as mobile station individual search bands. This figure shows that the CCE set processing unit a344 has selected the control channel elements with the control channel element indexes “33” and “34” of the CCE set 2 as the control channel elements in which the control information indicators are arranged.

In this case, the multiplexing unit a146 arranges the control information indicator generated by the control information indicator generating unit a243 in the control channel element indexes “33” and “34”, and the control channel element indexes “71” and “72”. The downlink control channel signal including the individual control data of the mobile station apparatus b3 is arranged.

Next, the decoding process in the mobile station apparatus b3 will be described.
The control information indicator detection unit b320 performs the same process as described in the second embodiment, selects the mobile station individual search bands CCE31 to CCE38, and selects the control channel element indexes “33” and “34”. Detecting the control information indicator.
The control information indicator detection unit b320 obtains, from the detected control information indicator, the individual information subband number “4”, the start point number “31”, and the CCE set number “2” from which the control information indicator is detected, as the CCE selection unit b3221. Output to.

The CCE selection unit b3221 sets the relative number “71” as the relative number “71” in the subband of the individual information subband number “4” input from the control information indicator detection unit b320. select.
The CCE selection unit b 3221 regards the control channel element with the control channel element index “71” as the start point number, and sets the continuous “8” control channel elements CCE71 to CCE78 as mobile station individual search bands. Control channel elements corresponding to the number of CCE aggregates “2” from which the control information indicator input from the control information indicator detection unit b320 is detected from the control channel elements of the control channel element index “71”. The signal of the selected control channel element is output to the QPSK demodulator b1222.
When the mobile station apparatus b3 decodes the signals of the two control channel elements CCE “71” and “72”, the mobile station apparatus b3 detects the control data specific to the mobile station apparatus addressed to itself.
In the third embodiment, the control channel element for starting the arrangement of the downlink control channel signal is relative to the start point number of the mobile station individual search band that is the output of the hash function f having the mobile station identifier as an input. Although the control channel elements having the same number are the same, the control channel elements having the same relative numbers as the control channel elements that have started to arrange the control information indicators may be used.
Also, when the subbands in which the control information indicator and the downlink control channel signal are arranged are the same, the same arrangement method as in the first embodiment may be used. That is, the downlink control channel signal may be arranged from the control channel element with the control channel element number of the control channel element in which the control information indicator is arranged.
In the third embodiment, in the subband of the individual information subband number, the number relative to the start point number of the mobile station individual search band that is the output of the hash function f having the mobile station identifier as an input is the same. Although a case has been described in which a downlink control channel signal is arranged from a control channel element, downlink control is performed on any control channel element in a plurality of control channel elements consecutive from the control channel element having the same relative number. You may make it arrange | position the signal of a channel. In other words, a mobile station individual search band for a downlink control channel that starts with a control channel element having the same relative number as a starting point number is newly set, and any of the set mobile station individual search bands for the downlink control channel is set. A downlink control channel signal may be arranged in such a control channel element. In this case, the number of control channel elements constituting the mobile station individual search band for the downlink control channel may be the same as or different from the number of control channel elements constituting the mobile station individual search band for the control information indicator. But you can.

<Modification 4>
The wireless communication system 3 has been described with respect to the case where the numbered control channel elements shown in FIG. 5 are used. In the fourth modification, the case where the control channel elements with different numbering are used will be described. .

FIG. 23 is a diagram illustrating numbering of control channel elements in the system band according to the fourth modification of the present embodiment. This figure shows that 5 subbands are configured in the system band, and 20 control channel elements are configured in each subband.
In the frequency domain, the frequency band of subband s is assumed to be lower than the frequency band of subband s + 1. For example, it is assumed that the frequency of the frequency band of subband 1 is lower than the frequency of the frequency band of subband 2, and the frequency of the frequency band of subband 2 is lower than the frequency of the frequency band of subband 3.

First, base station apparatus a3 interleaves resource elements in subband 1 using a block interleaver. The base station apparatus a3, for control channel elements each consisting of nine resource element groups, in the order of output from the block interleaver, CCE 1, CCE 2, CCE 3, CCE 4, CCE 5, CCE 6, CCE 7, CCE 8, CCE 9, CCE 10, CCE 11, CCE 12, CCE 13, CCE 14, CCE 15, CCE 16, CCE 17, CCE 18, CCE 19, CCE 20 are numbered.

Further, the base station apparatus a3 adds a number indicating the subband number “1” to the numbered control channel element, and CCE (1, 1), CCE (1, 2), CCE (1, 3, ), CCE (1, 4), CCE (1, 5), CCE (1, 6), CCE (1, 7), CCE (1, 8), CCE (1, 9), CCE (1, 10) , CCE (1, 11), CCE (1, 12), CCE (1, 13), CCE (1, 14), CCE (1, 15), CCE (1, 16), CCE (1, 17), Numbering is performed as CCE (1, 18), CCE (1, 19), and CCE (1, 20). Hereinafter, the number u (where u is a natural number) of the CCE (s, u) subjected to this numbering is referred to as a start number u. The number s indicates a subband number.

Next, the base station device a3 continues to CCE (2, 1), CCE (2, 2), CCE (2, 3), CCE (2, 4) in the same manner for the control channel element of subband 2. , CCE (2, 5), CCE (2, 6), CCE (2, 7), CCE (2, 8), CCE (2, 9), CCE (2, 10), CCE (2, 11), CCE (2, 12), CCE (2, 13), CCE (2, 14), CCE (2, 15), CCE (2, 16), CCE (2, 17), CCE (2, 18), CCE (2, 19) and CCE (2, 20) are numbered. The base station device a3 continues to number the control channel elements of subband 3, subband 4, and subband 5 in the same manner.

In the third embodiment described above, the CCE set processing unit a344 and the start CCE selection unit b121 select the subband number s and the start number u using the hash function g instead of the hash function f. .
Here, the hash function g is a function that outputs a subband number s and a start number u in response to input of a mobile station identifier.

Hereinafter, a specific example of control information indicator and downlink control channel detection processing according to the present modification will be described with reference to FIG. In this specific example, the number of control channel elements constituting the mobile station individual search band is “8”, and the number of CCE aggregates used for one downlink control channel signal in the multiplexing process is “2”. To do.

FIG. 24 is a diagram illustrating an example of downlink control channel multiplexing processing and detection processing according to the present modification.

First, the multiplex processing in the base station device a3 will be described.
This diagram is an explanatory diagram when the individual information subband number “4” is input from the control unit a33 to the CCE set processing unit a344.
This figure also shows the case where the CCE set processing unit a344 inputs the mobile station identifier to the hash function g and, as a result of output, selects the subband number “2” and the start number “11” as the start point numbers. Indicates. Note that the control channel elements of subband number “2” and start number “11” are CCE (2, 11) in FIG. 23, and CCE (2, 11) is a control channel element constituting subband 2. is there.

This figure shows a control channel element having the same number as the start number “11” of CCE (2, 11) in the subband of the individual information subband number “4” input from the control unit a33 by the CCE aggregation processing unit a344. It shows that CCE (4, 11) has been selected as the control channel element for starting the allocation of the downlink control channel signal.

Also, in this figure, the CCE aggregation processing unit a344 moves “8” control channel elements CCE (2, 11) to CCE (2, 18) having consecutive start numbers from the CCE (2, 11). Indicates that it has been selected as a station individual search band. This figure shows that the CCE set processing unit a344 has selected the control channel elements CCE (2, 13) and CCE (2, 14) of the CCE set 2 as control channel elements in which control information indicators are arranged.

In this case, the multiplexing unit a146 arranges the control information indicator generated by the control information indicator generating unit a243 in the control channel elements CCE (2, 13) and CCE (2, 14), and also controls the control channel element CCE (4 , 11) and CCE (4, 12), signals including control data specific to the mobile station apparatus b3 are arranged.

Next, the decoding process in the mobile station apparatus b3 will be described.
The start CCE selection unit b121 inputs the mobile station identifier to the hash function g, and outputs the subband number “2” and the start number “11” as a result of the output to the control information indicator detection unit b320.
The control information indicator detection unit b320 performs the same process as described in the second embodiment, selects the mobile station individual search bands CCE (2, 11) to CCE (2, 18), and controls the control channel. A control information indicator is detected from the elements CCE (2, 13) and CCE (2, 14).
The control information indicator detection unit b320 detects, from the detected control information indicator, the subband number “4” to which the control channel element that arranges the downlink control channel including the control data specific to the mobile station apparatus belongs, and the detected individual information The sub-band number “4”, the start number “11”, and the CCE set number “2” from which the control information indicator is detected are output to the CCE selection unit b3221.

The CCE selection unit b3221 selects the control channel element CCE (4, 11) of the start number “11” of the subband of the individual information subband number “4” input from the control information indicator detection unit b320.
The CCE selection unit b 3221 uses the control channel element of the control channel element CCE (4, 11) as the control channel element of the starting point number, and continues to “8” control channel elements CCE (4, 11) to CCE (4, 18) is selected as a mobile station individual search band, and control channel elements corresponding to the number of CCE sets “2” that have detected the control information indicator input from the control information indicator detection unit b320 from the control channel element CCE (4, 11) are selected. The signal of the selected control channel element is output to the QPSK demodulator b1222.
When the mobile station apparatus b3 decodes the signals of the two control channel elements CCE (4, 11) and CCE (4, 12), the mobile station apparatus b3 detects the individual control data for the mobile station apparatus addressed to itself.

Thus, according to this embodiment, in the radio communication system 3, the base station apparatus a3 transmits the control information indicator including information indicating the individual information subband number j, and the mobile station apparatus b3 is controlled by the control information indicator. Is decoded, the signal of the control channel element selected based on the individual information subband number j indicated by the information included in the signal is decoded, and the signal of the downlink control channel is decoded.
As a result, the radio communication system 3 detects the individual information subband number j from the control information indicator when the control information indicator indicates that there is control data addressed to itself, and based on the individual information subband number j. The control channel element signal can be demodulated and the control channel information can be detected, so that the decoding process of the downlink control channel signal including the control data can be reduced and the load on the receiving apparatus can be reduced. be able to.

In each of the above embodiments, the radio communication systems 1 to 3 have the same number of sets of control channel elements in which the control information indicator is arranged and the number of sets of control channel elements in which the control data is arranged. Although described, the present invention is not limited to this.
For example, in this case, information (band element number information) indicating the number of sets of control channel elements in which control data is arranged may be included in the control information indicator.

In each of the above embodiments, the radio communication systems 1 to 3 may determine in advance the number of control channel elements in which the control information indicator is arranged.

Note that a part of the base station devices a1, a2, a3 or the mobile station devices b1, b2, b3 in the above-described embodiment, for example, control indicator generation units a143, a243, a343, CCE set processing units a144, a244, a344. , Multiplexer a146, control information indicator detectors b120, b220, b320, start CCE selector b121, control channel decoders b122, b222, b322, CCE selectors b1221, b2221, b3221, QPSK demodulator b1222, Viterbi decoder b1223 The CRC inspection unit b1224 may be realized by a computer. In that case, the program for realizing the control function may be recorded on a computer-readable recording medium, and the program recorded on the recording medium may be read by a computer system and executed. The “computer system” here is a computer system built in the base station devices a1, a2, a3 or the mobile station devices b1, b2, b3, and includes hardware such as an OS and peripheral devices. Shall be. The “computer-readable recording medium” refers to a storage device such as a flexible medium, a magneto-optical disk, a portable medium such as a ROM or a CD-ROM, and a hard disk incorporated in a computer system. Furthermore, the “computer-readable recording medium” is a medium that dynamically holds a program for a short time, such as a communication line when transmitting a program via a network such as the Internet or a communication line such as a telephone line, In such a case, a volatile memory inside a computer system serving as a server or a client may be included and a program that holds a program for a certain period of time. The program may be a program for realizing a part of the functions described above, and may be a program capable of realizing the functions described above in combination with a program already recorded in a computer system.

As described above, the embodiment of the present invention has been described in detail with reference to the drawings. However, the specific configuration is not limited to the above, and various design changes and the like can be made without departing from the scope of the present invention. It is possible to

INDUSTRIAL APPLICABILITY The present invention is suitable for use in mobile station apparatuses, radio communication systems, and similar technologies related to mobile communications, and can reduce the number of control channel decoding processes and reduce the load on the receiving apparatus. it can.

A1, a1, a2 ... base station device, B1, B2, b1, b2, C1, c1, c2 ... mobile station device a11 ... reception processing unit, a12 ... radio resource control unit, a13 Control unit, a14, a24 ... Transmission processing unit a1411-a141-m ... Downlink shared data channel processing unit, a1421-a142-n ... Downlink control channel processing unit, a143, a243 ... CCE set processing unit, a144 ... pilot channel processing unit, a145 ... multiplexing unit, a146, a246 ... downlink control channel arrangement unit (individual signal arrangement unit), a147-1, a147-2, · Transmitter, a148-1, a148-2 ... Transmit antenna, a1411 ... Turbo encoder, a1412 ... Data modulator, a1413 ... S / Part, a1421 ... convolutional code part, a1422 ... QPSK modulation part, a1423 ... S / P part, a1471 ... IFFT part, a1472 ... GI insertion part, a1473 ... D / A part , A1474 ... transmission RF part b11, b21 ... reception processing part, b12 ... control part, b13 ... transmission processing part b111 ... reception part, b112 ... demultiplexing part, b113 ... Channel estimation unit, b114 ... channel compensation unit, b115 ... P / S unit, b116 ... data demodulation unit, b117 ... turbo decoding unit, b118 ... channel compensation unit, b119, b219 ..Selection unit, b120, b220 ... control channel decoding unit (individual signal decoding unit), b1111 ... reception RF unit, b1112 ... A / D unit, b1113 ... symbol Timing detection unit, b1114 ... GI removal unit, b1115 ... FFT unit, b1201, b2201 ... start CCE selection unit, b1202, b2202 ... CCE selection unit, b1203 ... QPSK demodulation unit, b1204 ..Viterbi decoder unit, b1205 ... CRC inspection unit

Claims (29)

In a wireless communication system comprising: a transmission device that transmits a transmission signal; and a reception device that receives the transmission signal from the transmission device;
The transmitter is
A transmission unit that transmits a control information indicator indicating that there is control information addressed to each of the receiving devices, included in the transmission signal;
The receiving device is:
An individual control signal decoding unit that performs a decoding process of the control information when a control information indicator indicating that there is control information addressed to the own apparatus is detected, and does not perform a decoding process of the control information when not detected; A wireless communication system. The wireless communication system according to claim 2, wherein the control information is selected from a plurality of types of control data. In a wireless communication system comprising: a transmission device that transmits a transmission signal; and a reception device that receives the transmission signal from the transmission device;
The transmitter is
An individual control signal arrangement unit arranged in a band for control information addressed to each of the receiving devices, the control data selected from a plurality of types of control data having different data formats, or a signal of individual control information that is a combination thereof; ,
For each of the receiving devices, when there is the individual control information addressed to the receiving device, a control information indicator generating unit that generates a control information indicator indicating that there is the individual control information addressed to the receiving device;
The receiving device generated by the control information indicator generating unit at least one of the individual signal arrangement bands obtained by allocating an individual search band based on the receiving device identifier for identifying the receiving device and dividing the allocated individual search band A control information indicator signal placement unit for placing the control information indicator addressed to the receiving device of the identifier;
A transmission unit that transmits the signal of the individual control information arranged by the individual control signal arrangement unit and the control information indicator arranged by the control information indicator signal arrangement unit in the transmission signal;
With
The receiving device is:
The individual search band is selected based on the reception apparatus identifier of the own apparatus notified in advance from the transmission apparatus, and the individual signal arrangement of the candidate is selected as the candidate of the individual signal arrangement band in the selected individual search band. A control information indicator detecting unit for detecting a control information indicator indicating that there is the individual control information addressed to the device by performing a decoding process on the transmission signal arranged in a band;
When the control information indicator detection unit detects a control information indicator indicating that there is the individual control information addressed to its own device, a decoding process is performed for each of a plurality of types of control data candidates for the signal of the individual control information. And when the control information indicator detection unit does not detect a control information indicator indicating that there is the individual control information addressed to its own device, the individual control signal decoding unit does not perform a decoding process on the signal of the individual control information When,
A wireless communication system comprising: The control information indicator generating unit generates a control information indicator indicating that there is the individual control information addressed to the receiving device when there is the individual control information addressed to the receiving device in a predetermined time band. The wireless communication system according to claim 3. The transmission device is a transmission device that arranges the transmission signal in a band element having a predetermined size and identified by a band element number,
The individual control signal arrangement unit arranges the signal of the individual control information in one or more band elements having consecutive band element numbers,
The control information indicator generation unit includes minimum number band information indicating a band element of a minimum band element number among band element numbers of band elements in which the individual control signal arrangement unit arranges the signal of the individual control information. The control information indicator is generated,
The control information indicator detection unit decodes the control information indicator addressed to its own device, detects the minimum number band information,
The individual control signal decoding unit demodulates a signal arranged in one or more band elements having continuous band element numbers from the band elements indicated by the minimum number band information detected by the control information indicator detection unit, The wireless communication system according to claim 3, wherein the demodulated information is decoded. The transmission device is a transmission device that arranges the transmission signal in a band element having a predetermined size and identified by a band element number,
The individual control signal arrangement unit arranges the signal of the individual control information in one or more band elements having consecutive band element numbers in a band of a band element set that is a set of a predetermined number of band elements. And
The control information indicator generating unit generates the control information indicator including information indicating a band element set including a band element in which the signal of the individual control information is arranged;
The control information indicator detection unit decodes the control information indicator addressed to its own device, detects information indicating the band element set,
The individual control signal decoding unit demodulates signals arranged in one or more band elements of the band element set indicated by the information detected by the control information indicator detection unit, and performs a decoding process on the demodulated information The wireless communication system according to claim 3. The control information indicator generation unit includes a minimum band element number among band element numbers of one or more band elements in which the individual control signal arrangement unit arranges the signal of the individual control information, and the control information indicator signal. Generating the control information indicator including a relative difference that is a difference between a band number where the arrangement unit arranges the control information indicator as minimum number band information;
The control information indicator detection unit decodes the control information indicator addressed to its own device, detects the relative difference,
The individual control signal decoding unit includes one or more band elements having a band element number that is a number obtained by adding the relative difference to the band element number of the band element in which the control information indicator detection unit has detected the control information indicator. 6. The radio communication system according to claim 5, wherein a signal arranged in the band elements is demodulated, and the demodulated information is decoded. The control information indicator generation unit includes a minimum band element number among band element numbers of one or more band elements in which the individual control signal arrangement unit arranges the signal of the individual control information, and the control information indicator signal. The control information indicator in which a relative difference that is a difference from the minimum band element number among the band element numbers of the band elements in the individual search band in which the arrangement unit arranges the control information indicator is included as minimum number band information Produces
The control information indicator detection unit decodes the control information indicator addressed to its own device, detects the relative difference,
The individual control signal decoding unit is a number obtained by adding the relative difference to a minimum band element number among band element numbers of band elements in the individual search band in which the control information indicator detecting unit has detected the control information indicator. 6. The radio communication system according to claim 5, wherein a signal arranged in one or more band elements including a band element having a band element number of is demodulated, and decoding processing is performed on the demodulated information. The transmission apparatus is a transmission apparatus that transmits a transmission signal using a system band including a plurality of subbands that are bands of a predetermined frequency bandwidth,
The control information indicator generating unit generates the control information indicator including the individual control signal subband information indicating the subband in which the individual control signal arrangement unit arranges the signal of the individual control information;
The control information indicator detecting unit decodes the control information indicator addressed to the own device, detects the individual control signal subband information,
The individual control signal decoding unit demodulates a signal arranged in one or more band elements including a band in a subband indicated by the individual control signal subband information detected by the control information indicator detection unit, The wireless communication system according to claim 3, wherein the demodulated information is decoded. The transmission device is a transmission device that arranges the transmission signal in a band element having a band of a predetermined size and identified by a band element number in a subband of each of the subbands. And
The band element number is a number in which the band element number in one of the subbands and the band element number in the other subband are associated with each other in advance.
The individual control signal arrangement unit includes a band element number of a band element in which the control information indicator signal arrangement unit arranges a control information indicator, and a band element of the band element number associated in the other subband, Arranging the signal of the individual control information;
The individual control signal decoding unit is a band element number in a subband indicated by the individual control signal subband information, and corresponds to a band element number of a band element in which the control information indicator detection unit has detected the control information indicator The signal arranged in one or more band elements having consecutive band element numbers is demodulated from the band elements of the assigned band element number, and the demodulated information is decoded. The wireless communication system according to 1. The control information indicator generation unit generates the control information indicator including band element number information indicating the number of band elements in which the individual control signal arrangement unit arranges the signal of the individual control information,
The control information indicator detection unit decodes the control information indicator addressed to its own device, detects the band element number information,
The individual control signal decoding unit demodulates signals arranged in the number of band elements indicated by the band element number information detected by the control information indicator detection unit, and performs a decoding process on the demodulated information. The wireless communication system according to claim 10. The control information indicator generation unit arranges the control information indicator in the individual signal arrangement band of a predetermined size band,
The control information indicator detection unit performs a decoding process on the transmission signal arranged in the individual signal arrangement band of the candidate, with the band having the predetermined size as a candidate for the individual signal arrangement band. The wireless communication system according to claim 3. In the receiving device that receives the transmission signal from the transmitting device,
An individual control signal decoding unit that performs a decoding process of the control information when a control information indicator indicating that there is control information addressed to the own apparatus is detected, and does not perform a decoding process of the control information when not detected; A receiving device. The receiving apparatus according to claim 13, wherein the control information is selected from a plurality of types of control data. It is control information addressed to each receiving device, the control data selected from a plurality of types of control data having different data formats or a signal of individual control information that is a combination thereof is arranged in a band, for each of the receiving devices, When there is the individual control information addressed to the receiving device, a control information indicator indicating that the individual control information addressed to the receiving device is present is generated, and an individual search is performed based on a receiving device identifier for identifying the receiving device A receiving device that receives a transmission signal from a transmitting device that allocates a band, arranges the allocated individual search band in at least one of the individual signal allocation bands, and transmits the allocated signal in a transmission signal In
The individual search band is selected based on the reception apparatus identifier of the own apparatus notified in advance from the transmission apparatus, and the individual signal arrangement of the candidate is selected as the candidate of the individual signal arrangement band in the selected individual search band. A control information indicator detecting unit for detecting a control information indicator indicating that there is the individual control information addressed to the own device by performing a decoding process on the transmission signal arranged in a band;
When the control information indicator detection unit detects a control information indicator indicating that there is the individual control information addressed to its own device, a decoding process is performed for each of a plurality of types of control data candidates for the signal of the individual control information. And when the control information indicator detection unit does not detect a control information indicator indicating that there is the individual control information addressed to the own device, the individual control signal decoding unit does not perform a decoding process on the signal of the individual control information And a receiving device. The control information indicator generating unit generates a control information indicator indicating that there is the individual control information addressed to the receiving device when there is the individual control information addressed to the receiving device in a predetermined time band. The receiving device according to claim 15. The transmission device arranges the transmission signal in a band element having a predetermined size and identified by a band element number, and the signal of the individual control information has a continuous band element number. A transmission device that is arranged in one or more band elements and transmits the arranged signal in a transmission signal,
The control information indicator includes minimum number band information indicating a band element of a minimum band element number among band element numbers of band elements in which the individual control signal arrangement unit arranges the signal of the individual control information,
The control information indicator detection unit decodes the control information indicator addressed to its own device, detects the minimum number band information,
The individual control signal decoding unit demodulates a signal arranged in one or more band elements having continuous band element numbers from the band elements indicated by the minimum number band information detected by the control information indicator detection unit, The receiving apparatus according to claim 15, wherein decoding processing is performed on the demodulated information. The transmission apparatus arranges the transmission signal in a band element having a predetermined size and identified by a band element number, and sets a predetermined number of signals of the individual control information. In the band of the band element set, which is a set of band elements, a transmission apparatus is arranged in one or more band elements having consecutive band element numbers and transmits the arranged signal in a transmission signal. ,
The control information indicator includes information indicating a band element set including a band element in which a signal of the individual control information is arranged,
The control information indicator detection unit decodes the control information indicator addressed to its own device, detects information indicating the band element set,
The individual control signal decoding unit demodulates signals arranged in one or more band elements of the band element set indicated by the information detected by the control information indicator detection unit, and performs a decoding process on the demodulated information The receiving device according to claim 15. The control information indicator is a difference between a minimum band element number among band element numbers of one or more band elements in which the signal of the individual control information is arranged and a band number in which the control information indicator is arranged. Including a certain relative difference as minimum number band information,
The control information indicator detection unit decodes the control information indicator addressed to its own device, detects the relative difference,
The individual control signal decoding unit includes one or more band elements having a band element number that is a number obtained by adding the relative difference to the band element number of the band element in which the control information indicator detection unit has detected the control information indicator. The receiving apparatus according to claim 17, wherein a signal arranged in the band elements is demodulated, and the demodulated information is decoded. The control information indicator includes a minimum band element number among band element numbers of one or more band elements in which the signal of the individual control information is arranged, and a band element in the individual search band in which the control information indicator is arranged. Including the relative difference that is the difference between the minimum band element number of the band element numbers of the
The control information indicator detection unit decodes the control information indicator addressed to its own device, detects the relative difference,
The individual control signal decoding unit is a number obtained by adding the relative difference to a minimum band element number among band element numbers of band elements in the individual search band in which the control information indicator detecting unit has detected the control information indicator. The receiving apparatus according to claim 17, wherein a signal arranged in one or more band elements including a band element having a band element number is demodulated, and decoding processing is performed on the demodulated information. The transmission apparatus is a transmission apparatus that transmits a transmission signal using a system band including a plurality of subbands that are bands of a predetermined frequency bandwidth,
The control information indicator includes individual control signal subband information indicating the subband in which the signal of the individual control information is arranged.
The control information indicator detecting unit decodes the control information indicator addressed to the own device, detects the individual control signal subband information,
The individual control signal decoding unit demodulates a signal arranged in one or more band elements including a band in a subband indicated by the individual control signal subband information detected by the control information indicator detection unit, The receiving apparatus according to claim 15, wherein decoding processing is performed on the demodulated information. The transmission device arranges the transmission signal in a band having a predetermined size and identified by a band element number in each subband of the subband, and the individual control An information signal is arranged in the band element number of the band element in which the control information indicator is arranged and the band element of the band element number associated in the other subband, and the arranged signal is used as a transmission signal. A transmission device that includes and transmits,
The individual control signal decoding unit is a band element number in a subband indicated by the individual control signal subband information, and corresponds to a band element number of a band element in which the control information indicator detection unit has detected the control information indicator 22. A signal arranged in one or more band elements having consecutive band element numbers is demodulated from the band elements of the assigned band element number, and decoding processing is performed on the demodulated information. The receiving device described in 1. The control information indicator includes band element number information indicating the number of band elements in which the signal of the individual control information is arranged,
The control information indicator detection unit decodes the control information indicator addressed to its own device, detects the band element number information,
The individual control signal decoding unit demodulates signals arranged in the number of band elements indicated by the band element number information detected by the control information indicator detection unit, and performs a decoding process on the demodulated information. The receiving device according to claim 22. The transmitting device arranges the control information indicator in the individual signal arrangement band of a band of a predetermined size,
The control information indicator detection unit performs a decoding process on the transmission signal arranged in the individual signal arrangement band of the candidate, with the band having the predetermined size as a candidate for the individual signal arrangement band. The receiving device according to claim 15. In a transmission device that transmits a transmission signal to a reception device,
A transmission apparatus comprising: a transmission unit that transmits a control information indicator indicating that control information addressed to each reception apparatus is included in the transmission signal. In a reception control method in a reception device that receives a transmission signal from a transmission device,
The receiving apparatus has a process of performing the decoding process of the control information when detecting a control information indicator indicating that there is control information addressed to the own apparatus, and not performing the decoding process of the control information when not detecting the control information indicator. A reception control method characterized by the above. In a transmission control method in a transmission device that transmits a transmission signal to a reception device,
A transmission control method comprising: a step of transmitting the control signal by including, in the transmission signal, a control information indicator indicating that the transmission device has control information addressed to each of the reception devices. A computer of a receiving device that receives a transmission signal from the transmitting device,
Reception that functions as an individual control signal decoding unit that performs decoding processing of the control information when a control information indicator indicating that there is control information addressed to its own device is detected, and does not perform decoding processing of the control information when it is not detected Control program. A computer of a transmitting device that transmits a transmission signal to the receiving device,
A transmission control program for causing a control information indicator indicating that there is control information addressed to each receiving device to function as a transmission means for transmitting by including it in the transmission signal.

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