WO2011001697A1 - Radio transmitting apparatus and radio transmitting method - Google Patents

Abstract

A radio transmitting apparatus and a radio transmitting method wherein even if a long TTI is allocated over a plurality of frames, the increase in signaling amount can be suppressed. There is provided a rule that placing an A-MAP, in which the same ACID value and the same long TTI indicator as an A-MAP placed in the first DL subframe of a frame (frame i) are set, in the last (third) DL subframe of the same frame (frame i) continuously allocate a long TTI also to the DL subframes of the immediately following frame (frame i + 1).

Description

Wireless transmission apparatus and wireless transmission method

The present invention relates to a wireless transmission device and a wireless transmission method.

The 3rd generation mobile communication service has been started, and multimedia communication such as data communication and video communication has become very popular. Under these circumstances, it is expected that the area in which communication is possible will expand as the demand for further communication in any environment increases.

Therefore, in IEEE 802.16m, it was agreed to support transmission using a relatively long time interval called long TTI (Long Transmission Transmission Time Interval) for the purpose of expanding the coverage that can be communicated. For example, according to Non-Patent Document 1, transmission using long TTI is performed by encoding transmission data by bundling a plurality of sub-frames and transmitting it as one HARQ (Hybrid Automatic Repeat reQuest) process. Since the rate can be set low, it is possible to improve the reception quality of a radio communication mobile station apparatus (hereinafter simply referred to as “mobile station”) located at a cell edge where reception power is not sufficiently obtained.

Also, in IEEE 802.16m, long-TTI indicator (Long-TTI-indicator) in a control channel called A-MAP (Advanced-MAP) for notifying resource allocation to a mobile station is used (Long-TTI indicator). TTI indicator = 1), it is decided to notify whether one subframe is assigned normally (Long TTI indicator = 0) (however, the A-MAP notifying the allocation information of the downlink transmission is DL basic assignment A-MAP) Hereinafter referred to simply as A-MAP).

FIG. 1 shows the allocation status of long TTIs composed of 6 downlink (DL) subframes in a TDD (Time Division Duplex) frame in which one frame is composed of 8 subframes. FIG. 1A shows a case where one frame is composed of six DL subframes and two uplink (UL) subframes, and FIG. 1B shows that one frame is composed of three DL subframes. The case where it is comprised with five UL sub-frames is shown.

In the case shown in FIG. 1A, a long TTI indicator (Long-TTI indicator = 1) is notified in the first DL subframe, whereby a long TTI composed of 6 subframes is easily assigned. On the other hand, in the case shown in FIG. 1B, a long TTI indicator (Long-TTI indicator = 1) is notified in the first DL subframe over two frames i and i + 1, and the HARQ process (HARQ process) number By making the same ACID (HARQ Channel Identifier), 3 subframes assigned to each frame are associated, and a long TTI composed of a total of 6 subframes is assigned.

IEEE 802.16m-09 / 0010r2, “Amendment Working Document (AWD)”, 2009.06.01

However, in the case shown in FIG. 1B, after receiving the data for three subframes in frame i, the mobile station performs data decoding and error detection as shown in FIG. 2, and reports the ACK / NACK signal to the base station. . Originally, the required quality is satisfied in 6 subframes, and decoding and error detection are performed only by receiving 3 subframes. Therefore, the required quality cannot be satisfied, and a NACK signal is reported. That is, useless resources are consumed for reporting the NACK signal.

Therefore, as shown in FIG. 3, it may be possible to transmit an additional control signal notifying that a continuous allocation remains in the next frame in the last DL subframe in frame i, but useless NACK. Although signal reporting can be prevented, additional control information becomes overhead, which increases the amount of signaling, which in turn decreases the amount of data traffic, and decreases the system throughput.

An object of the present invention is to provide a radio transmission apparatus and a radio transmission method capable of suppressing an increase in the amount of signaling even when a long TTI is allocated over a plurality of frames.

The radio transmission apparatus of the present invention, when arranging a plurality of control channels in the same frame, a control means for arranging one control channel in the last downlink subframe among the downlink subframes constituting the first frame; And a transmission means for transmitting the plurality of control channels arranged by the control means.

In the radio transmission method of the present invention, when a plurality of control channels are arranged in the same frame, one control channel is arranged in the last downlink subframe among the downlink subframes constituting the first frame, and the arrangement is performed. To send multiple control channels.

According to the present invention, an increase in signaling amount can be suppressed even when a long TTI is allocated over a plurality of frames.

The figure which shows the allocation status of long TTI comprised by six downlink sub-frames in the TDD frame which one frame comprises eight sub-frames The figure which shows the allocation status of long TTI comprised by six downlink sub-frames in the TDD frame which one frame comprises eight sub-frames The figure which shows a mode that a mobile station transmits a NACK signal. The figure which shows a mode that the control signal which notifies that the continuous allocation remains in the following frame remains The block diagram which shows the structure of the radio | wireless communication base station apparatus which concerns on Embodiment 1 of this invention. The figure which shows the allocation area | region corresponding to the long TTI indicator in a TDD frame structure of 3 DL sub-frames and 5 UL sub-frames The figure which shows the allocation area | region corresponding to the long TTI indicator in a TDD frame structure of 3 DL sub-frames and 5 UL sub-frames Diagram showing correspondence between physical resources and logical resources The figure which shows the control channel arrangement | positioning method which concerns on Embodiment 1 of this invention. The figure which shows the allocation condition of the long TTI indicator in the last DL sub-frame in a frame Block diagram showing a configuration of a mobile station according to Embodiment 1 of the present invention. The figure which shows the other control channel arrangement | positioning method which concerns on Embodiment 1 of this invention. The figure which shows the control channel allocation method which concerns on Embodiment 2 of this invention. The figure which shows the control channel arrangement | positioning method which concerns on Embodiment 3 of this invention. The figure which shows the other control channel arrangement | positioning method which concerns on Embodiment 3 of this invention. The figure which shows the control channel allocation method and user allocation information which concern on Embodiment 4 of this invention. The figure which shows the control channel allocation method and user allocation information which concern on Embodiment 5 of this invention. The figure which shows a mode that long TTI of 4 sub-frames is allocated to 2 frames every 2 sub-frames The figure which shows an example which applied this invention to UL transmission

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In the embodiment, a TDD system will be described as an example.

(Embodiment 1)
FIG. 4 is a block diagram showing a configuration of a radio communication base station apparatus (hereinafter simply referred to as “base station”) according to Embodiment 1 of the present invention. In this figure, a CRC unit 101 performs error detection coding on an information bit sequence and control information, and outputs an information bit sequence to which a CRC (Cyclic Redundancy Check) parity bit is added to an encoding unit 102.

The encoding unit 102 performs error correction encoding on the information bit sequence to which the CRC parity bits are added and the control information, and outputs a codeword matching the coding rate input from the control unit 110 to the modulation unit 103. In the IEEE 802.16m standard, different error correction codes for information bit strings and different error correction codes for control information are applied. For example, a turbo code is applied to the information bit string, and a tail-biting convolutional code is applied to the control information.

Modulation section 103 modulates each codeword corresponding to the information bit string and control information output from encoding section 102 with the modulation multi-level number input from control section 110 to generate a data symbol, and To 104.

Multiplexing section 104 arranges the data symbols output from modulation section 103 in the allocation time and frequency resources instructed from control section 110, and multiplexes the input pilot signals into the data symbols to generate baseband signals. Form. The formed baseband signal is output to transmission RF section 105. Details of the arrangement of the multiplexing unit 104 in time and frequency resources will be described later.

The transmission RF unit 105 converts the frequency of the baseband signal output from the multiplexing unit 104 into an RF signal and transmits the RF signal from the antenna 106.

The reception RF unit 107 receives control signals (ACK / NACK signal and CQI signal) transmitted from the mobile station via the antenna 106, converts the received control signal into a baseband signal, and outputs it to the demodulation unit 108. To do.

Demodulation section 108 demodulates the control signal output from reception RF section 107 and outputs it to decoding section 109, and decoding section 109 decodes the control signal output from demodulation section 108 and outputs it to control section 110. .

The control unit 110 identifies the ACK / NACK signal and the CQI signal included in the control information output from the decoding unit 109. Based on the identified CQI signal, the control unit 110 determines transmission parameters such as a coding rate, the number of modulation multi-values, and allocation resources, generates control information to be notified to the mobile station based on the determined transmission parameters, and generates a CRC. Output to the unit 101. In addition, control section 110 outputs the determined coding rate to coding section 102, outputs the modulation multi-level number to modulation section 103, and outputs allocation resources such as allocation time and frequency resources to multiplexing section 104.

Next, details of the control information generated by the control unit 110 described above will be described. Here, A-MAP used for mobile station individual allocation will be described as an example. The control unit 110 determines eight control information values shown in Table 1 based on the CQI signal from the mobile station, generates control information based on the values, and outputs the control information to the CRC unit 101.

In the present invention, since the parameters of the long TTI indicator and the ACID are closely related, these two parameters will be described below. First, the long TTI indicator is represented by 1 bit. When the value is 0, it indicates the allocation of a single subframe in which A-MAP is arranged, and when the value is 1, the subframe in which A-MAP is arranged. Shows consecutive assignments to all subsequent DL subframes. FIG. 5 shows an allocation region corresponding to a long TTI indicator in a TDD frame configuration of 3 DL subframes and 5 UL subframes ((DL, UL) = (3, 5)). FIG. 5A shows a case where the value of the long TTI indicator is 0 (0b0), and FIG. 5B shows a case where the value of the long TTI indicator is 1 (0b1).

ACID is expressed by 4 bits and indicates the HARQ process number. If the value indicated by this ACID is the same, it is identified as data of the same HARQ process, and if the value is different, it is identified as data of another HARQ process.

Next, the arrangement of time and frequency resources in the multiplexing unit 104 described above will be described. The multiplexing unit 104 converts the data symbols formed of information bit strings and the data symbols formed of control information into time and frequency resources according to respective LRU (Logical Resource Unit) numbers input from the control unit 110. Deploy.

This will be specifically described with reference to the example of FIG. The left side of FIG. 6 shows physical time and frequency resources, the right side of FIG. 6 shows logical resources obtained by replacing physical resources with LRU numbers, and physical resources and logical resources are paired with each other according to replacement rules. 1 corresponds. In IEEE 802.16m, it is defined that when one subframe is composed of 6 OFDM symbols and there is a 10 MHz frequency band, 48 LRUs are composed. All LRUs are a distributed LRU (Distributed LRU) area for obtaining frequency diversity gain, and a localized LRU (Localized LRU) area for continuously arranging resources with good frequency characteristics. It consists of two. The control channel arrangement area is arranged in a part of the distributed LRU area.

In the example of FIG. 6, the control unit 110 may arrange a data symbol configured with control information of a certain mobile station in an LRU No. X3 and arrange a data symbol configured with an information bit string in an LRU No. Y2, Y3. It shows how it is instructed. Further, the LRU numbers (Y2, Y3) in which the data symbols composed of information bit strings are arranged are notified by a parameter called resource allocation (Resource Allocation) shown in Table 1.

Here, in a frame composed of (DL, UL) = (3, 5) subframes, an example is shown in which LRU allocates n resources for 6 subframes to a certain mobile station over 2 frames. 7 for explanation.

In FIG. 7, two frames (frames i, i + 1) including (DL, UL) = (3, 5) subframes are shown, and the first DL subframe of frame i Thirdly, a situation is shown in which A-MAP, which is allocation control information to allocation target mobile stations, is arranged. Next, the control information notified by each A-MAP will be described.

In A-MAP arranged in the first DL subframe, LRU numbers corresponding to n allocated LRUs in frame i are set in the resource allocation part, ACID is set to # 1, and Long TTI indicator = 1 Notifying control information.

Further, in the A-MAP arranged in the third DL subframe, the LRU numbers corresponding to n allocation LRUs in frame i + 1 are set in the resource allocation part, the ACID is set to # 1, and Long TTI indicator = 1 The control information is notified.

Here, the A-MAP in which the same ACID value and the same long TTI indicator as the A-MAP in the first DL subframe are set in the third DL subframe which is the last DL subframe in the frame. To achieve long TTI allocation for 6 subframes over 2 frames without adding control information by providing a rule that long TTIs are continuously allocated to DL subframes of the immediately following frame. Can do.

Note that the above allocation rule is that the indication of Long TTI indicator = 1 in the last DL subframe in the frame shown in FIG. 8 is that there is no DL subframe continuous to this DL subframe. Therefore, it is the same as the instruction of Long TTI indicator = 0. Therefore, attention is paid to the fact that Long TTI indicator = 1 in the last DL subframe in the frame can be used as another allocation process.

FIG. 9 is a block diagram showing a configuration of the mobile station according to Embodiment 1 of the present invention. In this figure, a reception RF unit 202 receives a signal transmitted from a base station via an antenna 201, converts the frequency of the received signal into a baseband signal, and outputs the baseband signal to the separation unit 203.

Separating section 203 separates the received data signal into a control signal (including information such as allocation time, frequency resource, number of modulation multi-values, coding rate, information sequence length, etc.), received data symbol, and received pilot signal. Are output to control information processing section 204, received data symbols are output to demodulation section 205, and received pilot signals are output to channel quality estimation section 208.

The control information processing unit 204 demodulates and decodes the received control signal, specifies control information (allocation time, frequency resource, number of modulation multi-values, coding rate, information sequence length), and allocates time, frequency resource, and modulation The multi-value number is output to demodulation section 205, and the coding rate and information sequence length are output to decoding section 206. Details of the control information processing in the control information processing unit 204 will be described later.

Demodulation section 205 demodulates the received data symbol output from demultiplexing section 203 according to the allocation time, frequency resource, and modulation multilevel number output from control information processing section 204, and decoding section 206 receives control information processing section 204 from Based on the output coding rate and information sequence length, likelihood information for each bit output from the demodulator 205 is stored in the reception buffer, error correction decoding is performed, and a decoded bit string is obtained. The decoded bit string is output to the error detection unit 207. Decoding section 206 discards the received data stored in the reception buffer in the decoder only when an ACK signal is input from error detection section 207.

The error detection unit 207 performs error detection (CRC-check) on the decoded bit string output from the decoding unit 206. As a result of error detection, if there is an error in the decoded bit, a NACK signal is generated as a response signal. If there is no error in the decoded bit, an ACK signal is generated as a response signal, and the decoding unit 206 and the control signal generation unit 209 Output to. Also, the error detection unit 207 outputs the decoded bit string as a received bit string when there is no error in the decoded bit string.

Channel quality estimation section 208 estimates the channel quality (SINR) from the received pilot signal and outputs the SINR estimated value to control signal generation section 209.

Control signal generation section 209 generates feedback information by combining the ACK / NACK signal output from error detection section 207 and the SINR estimation value output from channel quality estimation section 208, and outputs the feedback information to encoding section 210. .

The encoding unit 210 and the modulation unit 211 encode and modulate the feedback information output from the control signal generation unit 209 and output it to the transmission RF unit 212.

The transmission RF unit 212 converts the feedback information output from the encoding unit 210 into an RF signal, and transmits the RF signal from the antenna 201.

Next, control information processing in the above-described control information processing unit 204 will be described with reference to FIG. The mobile station receives the A-MAP arranged in the first DL subframe of the frame i shown in FIG. 7, and the control information processing unit 204 is the control information addressed to itself through decoding and error detection. (1) Understand that n LRUs are allocated by resource allocation, (2) Understand that DL3 subframes of frame i are allocated by the long TTI indicator, ( 3) Knowing that the HARQ process of data assigned by ACID is # 1, and instructing the demodulator 205 to receive and process n assigned LRUs over 3 subframes in frame i.

Further, when the mobile station receives the A-MAP arranged in the third DL subframe of the frame i shown in FIG. 7 and recognizes it as control information addressed to itself through decoding and error detection, Similarly, the resource allocation, long TTI indicator, and ACID parameter values are confirmed. Here, the control information processing unit 204 determines that (1) ACID of the third A-MAP is the same as that of the first DL subframe, and (2) that the long TTI indicator is “1”. Is received, the demodulator 205 is instructed to continue the continuous long TTI reception of 3 subframes in the frame i + 1.

As described above, according to the first embodiment, the A-MAP in which the same ACID value and the same long TTI indicator as the A-MAP in the same frame are arranged in the last DL subframe in the frame By providing a rule that continuously assigns long TTIs to other DL subframes, it is possible to assign long TTIs over a plurality of frames without adding control information.

In the present embodiment, the case where the control channel such as A-MAP is arranged in the first DL subframe of the first frame has been described as an example. However, the present invention is not limited to this, and for example, FIG. As shown in FIG. 5, a control channel such as A-MAP may be arranged in the second DL subframe of the first frame, and a long TTI of 5 subframes may be allocated over 2 frames.

(Embodiment 2)
In the first embodiment, the case where a long TTI is individually allocated to a mobile station (individual allocation) has been described. However, in the second embodiment of the present invention, the case where a long TTI is allocated to a group consisting of a plurality of mobile stations (group allocation). ).

The configuration of the base station according to the second embodiment of the present invention is the same as the configuration shown in FIG. 4 of the first embodiment, and only some functions are different. To do.

First, the difference in the configuration of control information between individual assignment and group assignment will be described. Unlike the assignment to individual mobile stations, the group assignment is a DL group configuration A-MAP (hereinafter referred to as “GC A-MAP (Group Configuration A-MAP)”) that indicates a group configuration composed of a plurality of mobile stations. ) And DL group resource allocation A-MAP (hereinafter referred to as “GRA A－MAP (DL Group Resource Allocation A-MAP)”) indicating the allocated resource. Further, the long TTI indicator and the ACID parameter are notified by GCＧA-MAP and set in common to all mobile stations in the group.

However, when trying to allocate a DL subframe that exceeds the frame, it is necessary to transmit by adding GC A-MAP in order to notify that the ACID is the same in the next frame. Will occur.

Here, in a frame composed of (DL, UL) = (3, 5) subframes, the resources for n LRUs are divided into groups of a plurality of mobile stations for 6 subframes over 2 frames. An example of assignment will be described with reference to FIG.

As shown in FIG. 11, in the same way as in Embodiment 1, it is possible to arrange GRA－A-MAP in the third DL subframe, which is the last DL subframe in the frame, in the first DL subframe. The control unit 110 is provided with a rule that the same ACID value and the same long TTI indicator as GRAＧA-MAP are interpreted, and the long TTI is continuously assigned to the DL subframe of the immediately following frame. Thereby, long TTI allocation for 6 subframes can be realized over 2 frames without adding control information.

As described above, according to the second embodiment, the GRA A-MAP in the same frame is arranged in the last DL subframe in the frame, and the same ACID value and the same as the previous GRA A-MAP in the same frame. By interpreting it as a long TTI indicator and providing a rule that continuously assigns a long TTI to the DL subframe of the immediately following frame, a long TTI can be moved over multiple frames without adding control information. Can be assigned to a group of stations.

(Embodiment 3)
In the second embodiment, the case where the long TTI is allocated over two consecutive frames has been described. In the third embodiment of the present invention, the case where the long TTI is allocated over three consecutive frames will be described.

The configuration of the base station according to Embodiment 3 of the present invention is the same as the configuration shown in FIG. 4 of Embodiment 1, and only some of the functions are different. To do.

As shown in FIG. 12, a long TTI is continuously allocated for two frames (frames i and i + 1), and the last DL subframe of the rear frame (frame i + 1) is assigned to the GRA A-MAP in the immediately preceding frame (frame i). The control unit 110 is provided with a rule that the arrangement of the GRAＭA-MAP in which the same ACID value and the same long TTI indicator are set assigns a long TTI to the DL subframe of the immediately following frame (frame i + 2). . As a result, a long TTI of 9 subframes over 3 frames can be allocated to a group of a plurality of mobile stations without adding control information.

As described above, according to Embodiment 3, it is the same ACID as GRA A-MAP used immediately before the last DL subframe of each frame that GRA A-MAP is arranged in the last DL subframe of each frame. By assigning a long TTI for two or more frames by interpreting that the value is the same LongＤＬTTI indicator = 1 and assigning a long TTI continuously to the DL subframe of the immediately following frame be able to.

In this embodiment, an example of group assignment has been described. However, the present invention is not limited to this, and can also be applied to individual assignment.

Further, in this embodiment, it is notified that the long TTI is allocated to the third frame by arranging GRA A-MAP in the last DL subframe of the second frame, but as shown in FIG. In the second DL subframe of the frame, GRA A-MAP is arranged, and notification that the long TTI is assigned to the second frame, and GRA A-MAP is assigned to the third DL subframe of the first frame. It may be arranged to notify that a long TTI is assigned to the third frame.

(Embodiment 4)
In Embodiments 2 and 3, a case has been described in which long TTIs having the same number of subframes are allocated to mobile stations in the same group. However, in Embodiment 4 of the present invention, each mobile station in the same group differs. A case where a long TTI having the number of subframes is allocated will be described.

The configuration of the base station according to the fourth embodiment of the present invention is the same as the configuration shown in FIG. 4 of the first embodiment, and only some functions are different. To do.

As shown in FIG. 14, in the user bitmap (User Bitmap) information notified by GRA A-MAP and indicating the assignment status of each mobile station in the group, the mobile station having the assignment notification in the last DL subframe The controller 110 is provided with a rule that all subframes of the immediately following frame are continuously allocated.

In FIG. 14, the user bitmap in GRA A-MAP in the first DL subframe of frame i indicates that long TTIs are assigned to users # 1, # 4, and # 5. Is assigned a long TTI of 3 subframes in frame i. Also, the user bitmap in GRA－A-MAP in the third DL subframe of frame i indicates that long TTIs are assigned to users # 1 to # 4, and these users are assigned 3 in frame i + 1. A long TTI of the subframe is assigned.

As a result, users # 1 and # 4 can be assigned a long TTI of 6 subframes over 2 frames (frames i and i + 1), and users # 2 and # 3 can be assigned a rear frame (frame i + 1). Can be assigned a long TTI for three subframes, and user # 5 can be assigned a long TTI for three subframes in the preceding frame (frame i).

As described above, according to the fourth embodiment, a mobile station that is notified by GRA－A-MAP and has an allocation notification in the last DL subframe in the frame by the user bitmap indicating the allocation status of each mobile station in the group By providing a rule that all subframes of the immediately following frame are continuously allocated, even when a plurality of mobile stations are grouped, a long TTI having a different number of subframes can be allocated to each mobile station. A flexible long TTI corresponding to the mobile station can be assigned.

(Embodiment 5)
In Embodiment 4, a case has been described in which all subframes of the immediately following frame are continuously allocated to a mobile station that has been notified of allocation in the last DL subframe in the frame, but in Embodiment 5 of the present invention, A case will be described in which one subframe is allocated to a mobile station that has been notified of allocation in the last DL subframe in the frame.

The configuration of the base station according to Embodiment 5 of the present invention is the same as the configuration shown in FIG. 4 of Embodiment 1, and only some of the functions are different. To do.

As shown in FIG. 15, in the user bitmap information notified by GRA A-MAP, a mobile station that has been notified of assignment only in the last DL subframe has a single sub-location in which this GRA A-MAP is arranged. A rule for assigning a frame is provided in the control unit 110.

In FIG. 15, the user bitmap in GRA A-MAP in the first DL subframe of frame i indicates that long TTIs are assigned to users # 1, # 4, and # 5. Is assigned a long TTI of 3 subframes in frame i. Also, the user bitmap in GRA－A-MAP in the third DL subframe of frame i indicates that long TTIs are assigned to users # 1 and # 4, and these users are assigned 3 in frame i + 1. A long TTI of the subframe is assigned. Furthermore, the user bitmap in GRA A-MAP in the third DL subframe of frame i shows that only the last DL subframe is allocated to users # 2 and # 3. One subframe is allocated in frame i.

As a result, a long TTI of 6 subframes can be allocated to users # 1 and # 4 over 2 frames (frames i and i + 1), and a forward frame (frame i) is assigned to users # 2 and # 3. 1 sub-frames can be allocated to user # 5, and a long TTI of 3 sub-frames can be allocated to user # 5 in the front frame (frame i).

Thus, according to Embodiment 5, this GRA A-MAP is allocated to a mobile station that has been notified of allocation in the last DL subframe in the frame by the user bitmap notified by GRA A-MAP. By providing a rule for assigning a single subframe, a single subframe can be assigned even when a plurality of mobile stations are grouped.

In each of the above embodiments, GRA A-MAP is mainly arranged in the first DL subframe and the third DL subframe of the first frame, and the long TTI of 6 subframes is divided into two frames. However, the present invention is not limited to this. For example, as shown in FIG. 16, GRA A-MAP is assigned to the second DL subframe and the third DL subframe of the first frame. The long TTI of 4 subframes may be allocated to 2 frames every 2 subframes.

In each of the above embodiments, a frame configuration including three DL subframes and five UL subframes has been described as an example. However, the present invention is not limited to this, and the number of DL subframes and UL subframes are not limited thereto. The combination with the number may be different combinations such as (DL, UL) = (4, 4), (5, 3), (6, 2).

In each of the above embodiments, the DL transmission has been described as an example. However, the present invention is not limited to this, and can be applied to UL transmission as shown in FIG.

In each of the above embodiments, the TDD system has been described as an example. However, the present invention is not limited to this, and is applicable to an FDD (Frequency Division Multiplex) system.

Note that although cases have been described with the above embodiment as examples where the present invention is configured by hardware, the present invention can also be realized by software.

Further, each functional block used in the description of each of the above embodiments is typically realized as an LSI which is an integrated circuit. These may be individually made into one chip, or may be made into one chip so as to include a part or all of them. Although referred to as LSI here, it may be referred to as IC, system LSI, super LSI, or ultra LSI depending on the degree of integration.

Also, the method of circuit integration is not limited to LSI, and may be realized by a dedicated circuit or a general-purpose processor. An FPGA (Field Programmable Gate Array) that can be programmed after manufacturing the LSI or a reconfigurable processor that can reconfigure the connection and setting of circuit cells inside the LSI may be used.

Furthermore, if integrated circuit technology that replaces LSI emerges as a result of advances in semiconductor technology or other derived technology, it is naturally also possible to integrate functional blocks using this technology. Biotechnology can be applied.

In addition, although demonstrated as an antenna in the said embodiment, this invention is applicable similarly also with an antenna port (antenna port).

Antenna port refers to a logical antenna composed of one or more physical antennas. That is, the antenna port does not necessarily indicate one physical antenna, but may indicate an array antenna composed of a plurality of antennas.

For example, in 3GPP LTE, it is not specified how many physical antennas an antenna port is composed of, but it is specified as a minimum unit in which a base station can transmit different reference signals (Reference signal).

Also, the antenna port may be defined as a minimum unit for multiplying the weight of a precoding vector (Precoding vector).

The disclosure of the specification, drawings and abstract contained in the Japanese application of Japanese Patent Application No. 2009-159211 filed on July 3, 2009 is incorporated herein by reference.

The radio transmission apparatus and radio transmission method according to the present invention can be applied to, for example, a mobile communication system.

101 CRC section 102, 210 Encoding section 103, 211 Modulation section 104 Multiplexing section 105, 212 Transmission RF section 106, 201 Antenna 107, 202 Reception RF section 108, 205 Demodulation section 109, 206 Decoding section 110 Control section 203 Separation section 204 Control information processing unit 207 Error detection unit 208 Channel quality estimation unit 209 Control signal generation unit

Claims (6)

When arranging a plurality of control channels in the same frame, control means for arranging one control channel in the last downlink subframe among the downlink subframes constituting the first frame;
Transmitting means for transmitting the plurality of control channels arranged by the control means;
A wireless transmission device comprising: The one control channel is subjected to reception processing in combination with the data allocated to the downlink subframe in the second frame for all the downlink subframes in the second frame immediately following the first frame. The wireless transmission device according to claim 1, wherein the communication partner device is notified that data is allocated. The one control channel is a control channel indicating a group configuration when a plurality of radio communication mobile station apparatuses are grouped, and all downlink subframes in the second frame immediately after the first frame The radio transmission apparatus according to claim 1, wherein the radio communication mobile station apparatus is notified that data to be received and combined with data allocated to a downlink subframe in the second frame is allocated. The one control channel includes bitmap information indicating to which radio communication mobile station apparatus in the group the long TTI is allocated, and the long TTI is allocated only by the last downlink subframe of the first frame. The radio transmission apparatus according to claim 3, wherein the radio communication mobile station apparatus is notified that data is allocated to all downlink subframes in the second frame immediately following the first frame. The one control channel includes bitmap information indicating to which radio communication mobile station apparatus in the group the long TTI is allocated, and the long TTI is allocated only by the last downlink subframe of the first frame. The radio transmission apparatus according to claim 3, which notifies the radio communication mobile station apparatus that data is allocated to the last downlink subframe of the first frame. When arranging a plurality of control channels in the same frame, one control channel is arranged in the last downlink subframe among the downlink subframes constituting the first frame,
Transmitting the arranged plurality of control channels;
Wireless transmission method.

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