WO2011015076A1 - Method and device for realizing downlink carrier control region - Google Patents

Abstract

A method for realizing a downlink carrier control region, comprises the following steps: dividing time-frequency resources on at least one carrier in a subframe into a control region and a non-control region (501), and setting the time-frequency resources of the control region by signaling (502). Correspondingly, the present invention also provides a device for realizing downlink carrier control region, which includes: a division module, used for dividing time-frequency resources on at least one carrier in a subframe into a control region and a non-control region; and a time-frequency resource setting module, used for setting the time-frequency resources of the control region by signaling. The method and device for realizing downlink carrier control region, which are provided for LTE-Advanced by the present invention, can flexibly adjust the bandwidth and frequency position of the carrier control region, realize transmitting the pilot frequency and the Physical Downlink Shared Channel PDSCH, which locate in different positions, with different power, and better realize the interference collaboration and frequency multiplexing between the cells.

Description

 Method and device for implementing downlink carrier control domain

TECHNICAL FIELD The present invention relates to the field of mobile wireless communications, and more particularly to a method and apparatus for implementing a downlink carrier control domain in a wireless communication system.

Background technique

 (1) The frame structure of the Evolved Universal Terrestrial Radio Access (E-UTRA) Figure 1 (a) and Figure 1 (b) are respectively the frequency division of the Long Term Evolution (LTE) system. Schematic diagram of the frame structure of the Frequency Division Duplex (FDD) mode and the Time Division Duplex (TDD) mode. In the frame structure of the FDD mode shown in FIG. 1( a ), a 10 ms radio frame is composed of twenty slots (lengths) of lengths of 0.5 ms and slots 0 to 19, and slots 2i and 2i+l constitutes a subframe i with a length of 1 ms. In the frame structure of the TDD mode shown in FIG. 1(b), a 10 ms radio frame is composed of two half frames of 5 ms length, and one field contains 5 lengths of 1 ms. Subframe (frame). Subframe i is defined as two time slots 2i and 2i+1 that are 0.5 ms long. In the two frame structures, for the Normal Cyclic Prefix (Normal CP), one slot contains seven symbols with a length of 66.7us, where the CP of the first symbol has a length of 5.21us, and the other six symbols have a CP. The length is 4.69us; for the extended CP, one slot contains 6 symbols, and the CP length of all symbols is 16.67us.

(2) Physical Broadcast Channel (PBCH) defined by E-UTRA: The downlink carrier system bandwidth is carried, and the Physical Hybrid ARQ Indicator Channel (PHICH) sets the system frame number. And other information. The encoded Broadcast Channel (BCH) transport block is mapped to 4 subframes in a 40 ms interval. 40 ms timing is obtained by blind detection, ie There is no direct signaling for 40ms timing. Each subframe is considered to be self-decodable, ie if the channel conditions are good enough, the BCH can decode from a single reception. Physical Control Format Indicator Channel (PCFICH): The number of Orthogonal Frequency Division Multiplexing (OFDM) symbols used by the UE to transmit a Physical Downlink Control Channel (PDCCH), Each sub-frame is transmitted. Physical downlink control channel (PDCCH): notifies the UE of resource allocation for paging channel (PCH) and downlink shared channel (DL-SCH), and hybrid automatic retransmission related to DL-SCH ( Hybrid ARQ) information; and the Uplink Scheduling Grant. Physical Hybrid ARQ Indicator Channel (PHICH): A acknowledgment/negative acknowledgment (ACK/NAKs) of hybrid automatic retransmission (Hybrid ARQ) corresponding to uplink transmission. Physical Downlink Shared Channel (PDSCH): carries DL-SCH and PCH. Physical Multicast Channel (PMCH): The MCH is carried. Downlink reference Signal: Consists of a known reference signal of the first and last third OFDM symbols inserted into each slot. There is a reference signal transmission at each antenna port. The downstream antenna port is equal to 1, 2 or 4. The two-dimensional reference signal sequence is a symbol-by-symbol product of a two-dimensional orthogonal sequence and a two-dimensional pseudo-random sequence. There are 3 different two-dimensional orthogonal sequences and 170 different two-dimensional pseudo-random sequences. The ID of each cell corresponds to a combination of a unique orthogonal sequence and a pseudo-random sequence.

(III) Startup communication link establishment process FIG. 2 is a schematic diagram of the time-frequency position of each physical channel of the downlink carrier of the FDD frame structure. Figure 3 shows the flow chart for establishing the E-UTRAN boot communication link. As shown in FIG. 3, the link establishment process mainly includes the following steps: Step S310: After booting, the UE performs cell search by searching for primary synchronization of the cell (Primary SynCHronization, PSCH M and Secondary Synchronization (SSCH) signals, obtain the downlink subframe synchronization of the cell, the cell ID, and the center frequency of the carrier; Step S320, the UE obtains the downlink system bandwidth and the PHICH configuration by receiving and decoding the PBCH. And the information of the frame number of the system and the setting of the system pilot (reference signal); in step S330, the UE determines the time/frequency position of the PCFICH according to the obtained downlink system bandwidth, the cell ID, and the system pilot setting, and receives the PCFICH. Channel and decoding, obtaining PDCCH control region OFDM symbol number information, determining a PHICH time/frequency resource location; Step S340, the UE according to the obtained downlink system bandwidth, cell ID, PCFICH bearer PDCCH region OFDM symbol number, PHICH configuration, and system guide Determining the search space of the PDCCH, determining the PDCCH search space, performing PDCCH blind detection; Step S350, decoding the system message carried in the corresponding PDSCH by using the PDCCH for indicating the PDSCH of the bearer system message in the PDCCH search space, and obtaining the carrier wireless Resource configuration message, complete uplink synchronization; Step S360, per carrier wireless resource The source configuration is uplinked and the communication link is established. (iv) Advanced Long Term Evolution (LTE-Advanced)

LTE Release-8 defines six bandwidths: 1.4MHz, 3MHz, 5MHz, 10MHz, 15MHz and 20MHz.

LTE-Advanced (More Advancements for E-UTRA) is an evolved version of LTE Release-8. In addition to meeting or exceeding all relevant requirements of 3GPP TR 25.913: "Requirements for Evolved UTRA (E-UTRA) and Evolved UTRAN (E-UTRAN)", it also meets or exceeds the requirements of IMT-Advanced proposed by ITU-R. The requirements for backward compatibility with LTE Release-8 refer to: LTE Release-8 terminals can work in LTE-Advanced networks; LTE-Advanced terminals can work in LTE Release-8 networks. In addition, LTE-Advanced should be able to operate in different frequency domain configurations, including a wider spectrum configuration than LTE Release-8 (eg, 100 MHz continuous spectrum resources) to achieve higher performance and target peak rates. Considering compatibility with LTE Release-8, for bandwidths greater than 20 MHz, Carrier aggregation is used, namely: Two or more component carriers are aggregated to support an uplink/downlink transmission bandwidth greater than 20 MHz. The terminal can receive/transmit one or more component carriers at the same time according to its capability, and the LTE-A terminal with more than 20 MHz receiving capability can simultaneously receive transmissions on multiple component carriers. The LTE Release-8 terminal can only receive transmissions on one component carrier, such as the structure of the component carrier following the LTE Release-8 specification. Currently, there are some definitions of the carrier form in the LTE-Advanced standard:

(1) Backward compatible carrier: UEs capable of accessing all existing LTE versions, can be operated in a single carrier (stand-alone) or as part of carrier aggregation. For FDD, backward compatible carriers always appear in pairs. , namely Downlink (DL) and Uplink (UL).

(2) Non-backward compatible carrier: If defined, this type of carrier can be accessed by UEs defining the LTE version of this type of carrier and cannot be accessed by UEs of the previous LTE version. If the incompatibility is derived from the frequency reuse distance, it can be stand-alone in the form of a single carrier or as part of a carrier aggregation. (3) Extension carrier: If defined, it cannot operate in the form of a single carrier, it must be a component of a carrier group, and at least one of the carriers can be stand-alone in the form of a single carrier.

SUMMARY OF THE INVENTION At present, there is no conclusion about the implementation method of the LTE-Advanced carrier, and one feasible solution is to follow the channel structure in LTE Release-8. Considering that it is necessary to perform interference coordination between cells in LTE-Advanced, that is, Inter-Cell Interference Control to improve frequency efficiency, and control domain in LTE Release-8 (including PDCCH, PCFICH, and PHICH) The bandwidth of the traffic channel is the same as the bandwidth of the traffic channel PDSCH, which is not conducive to interference coordination between the inter-cell control signals. In addition, the downlink pilots in LTE Release-8 are transmitted at the same power in the whole system bandwidth, which is disadvantageous for frequency multiplexing and interference coordination of traffic channels between cells. The technical problem to be solved by the present invention is to provide an implementation of a downlink carrier control domain. The solution realizes interference coordination between cells in the LTE-Advanced system. In order to solve the above technical problem, the present invention provides a method for implementing a downlink carrier control domain, including: dividing a time-frequency resource on at least one component carrier in a subframe into a control domain and a non-control domain, The time-frequency resources of the control domain. Preferably, the control domain includes at least one sub-control domain, and the sub-controls are frequency division multiplexed between domains. Preferably, the sub-control domain is configured to transmit a physical downlink control channel, a physical control format indication channel, or a physical hybrid automatic retransmission indication channel. Preferably, the step of setting the time-frequency resource of the control domain by signaling comprises: setting, by the signaling, the frequency resource of the sub-control domain. Preferably, the signaling of the frequency resource of the sub-control domain is set, or is indicated by a physical broadcast channel or by higher layer signaling. Preferably, the step of setting the time-frequency resource of the control domain by signaling comprises: indicating a time domain location of the sub-control domain by signaling carried on a physical control format indication channel. Preferably, the non-control domain is a time-frequency resource other than the control domain in a time-frequency resource. Preferably, the non-control domain is used to transmit one or more of a physical broadcast channel, a physical downlink shared channel, a primary synchronization signal, a secondary synchronization signal, and a pilot. Preferably, the step of setting the time-frequency resource of the control domain by signaling includes: the non-control domain and the control domain independently allocate power in a non-control domain bandwidth and a control domain bandwidth, respectively, which are set by signaling Non-control domain bandwidth and power in the control domain bandwidth. In order to solve the above technical problem, the present invention further provides an apparatus for implementing a downlink carrier control domain, including:

 a dividing module, configured to: divide time-frequency resources on at least one component carrier in one subframe into a control domain and a non-control domain;

A time-frequency resource setting module, configured to set a time-frequency resource of the control domain by signaling. Advantageously, said control domain comprises at least one sub-control domain; When there are multiple sub-control domains, the sub-control domains are frequency division multiplexed.

 Preferably, the sub-control domain is configured to transmit a physical downlink control channel, a physical control format indication channel, or a physical hybrid automatic retransmission indication channel;

 The non-control domain is configured to transmit one or more of a physical broadcast channel, a physical downlink shared channel, a primary synchronization signal, a secondary synchronization signal, and a reference signal. Preferably, the signaling for setting the frequency resource of the sub-control domain is configured by physical broadcast channel bearer or high layer signaling. Preferably, the time-frequency resource setting module is configured to set the time-frequency resource of the control domain by signaling as follows:

 The time domain location of the sub-control domain is set by signaling carried on the physical control format indicator channel. Preferably, the time-frequency resource setting module is further configured to: independently allocate power in the non-control domain bandwidth and the control domain bandwidth, and set the non-control domain bandwidth and the power in the control domain bandwidth by signaling, respectively.

Compared with the prior art, the present invention is a method for implementing a downlink carrier control domain provided by LTE-Advanced, which can flexibly adjust the bandwidth and frequency position of the carrier control domain, and realize pilot and physical downlink sharing of different frequency positions in the carrier. The channel PDSCH is transmitted with different powers, which better implements interference coordination and frequency reuse between cells, improves the flexibility of system scheduling, and is beneficial to the implementation and development of the LTE-Advanced system.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1( a ) is a schematic diagram of a frame structure of an FDD mode of an LTE system; FIG. 1( b ) is a schematic diagram of a frame structure of a TDD mode of an LTE system; FIG. 2 is a schematic diagram of a time-frequency location of each physical channel of a downlink carrier of an FDD frame structure; Figure 3 is a schematic diagram of the E-UTRAN boot communication link establishment process; Figure 4 (a), Figure 4 (b), and Figure 4 (c) show that the control domain bandwidth is less than the system bandwidth. 3 different frequency positions of the domain; FIG. 5 is a flowchart of a method for implementing a downlink carrier control domain according to an embodiment of the present invention.

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings and embodiments, by which the present invention is applied to the technical means to solve the technical problems, and the realization of the technical effect can be fully understood and Implementation. When the downlink carrier control domain of the present invention is implemented, as shown in FIG. 5, the method includes the following steps: Step 501: The base station divides time-frequency resources on k (one is an integer greater than or equal to 1) component carriers in one subframe into one subframe. a control domain and a non-control domain; and step 502: setting a time-frequency resource of the control domain by signaling. The control domain includes p (p is an integer greater than or equal to 1) sub-control domains, and each sub-control domain is frequency division multiplexed. The sub-control domain can transmit a PDCCH, a PCFICH or a PHICH channel. The frequency resource of the sub-control domain is set by signaling, where the signaling is configured by a PBCH bearer or a higher layer signaling. The time domain location of the sub-control domain is indicated by signaling, which is carried on the PCFICH channel. The non-control domain is a resource other than the control domain in the time-frequency resource, and the non-control domain may transmit one or more channels and/or signals in the PBCH, the PDSCH, the PSCH, the SSCH, and the pilot. The power in the non-control domain bandwidth and the control domain bandwidth are independently allocated, respectively, indicated by signaling. The present invention also provides an apparatus for implementing a downlink carrier control domain, including:

 a dividing module, configured to: divide time-frequency resources on at least one component carrier in one subframe into a control domain and a non-control domain;

 Time-frequency resource setting module, its setting: Set the time-frequency resource of the control domain by signaling.

The control domain contains at least one sub-control domain; and when there are multiple sub-control domains, the sub-control domain Frequency division multiplexing.

 The sub-control field is configured to transmit a physical downlink control channel, a physical control format indication channel, or a physical hybrid automatic retransmission indication channel;

 The non-control domain is used to transmit one or more of a physical broadcast channel, a physical downlink shared channel, a primary synchronization signal, a secondary synchronization signal, and a pilot.

 The signaling for setting the frequency resource of the sub-control domain is indicated by physical broadcast channel bearer or higher layer signaling. The time-frequency resource setting module is configured to set the time-frequency resource of the control domain by signaling by: setting a time domain location of the sub-control domain by signaling carried on the physical control format indication channel.

 The time-frequency resource setting module is further configured to: independently allocate power in the non-control domain bandwidth and control domain bandwidth, and set the non-control domain bandwidth and the power in the control domain bandwidth by signaling, respectively.

The implementation method of the downlink carrier control domain of the present invention will be described below with reference to specific embodiments. In the following embodiment, the frame structure 1 is taken as an example, where k=l and p=l. The first embodiment of the physical broadcast channel (PBCH) carries information such as the downlink carrier system bandwidth, the PHICH setting, the system frame number, and the bandwidth and frequency position of the control domain.

The signaling carried by the PCFICH channel indicates that the time domain resource of the control domain is the first "OFDM symbols (l ≤ n ≤ 4) in one subframe. The PDCCH, PCFICH, and PHICH are transmitted in the control domain. Physical broadcast channel with (m> l) bits (bit) a bandwidth indication field indicating types of carrier 2 ^∞ control domain bandwidth. The frequency position indication field of r ( r > l ) bit indicates the default control domain frequency position for each control domain bandwidth. E.g:

(1) m = \ , the bandwidth indication fields 0 and 1 take the value, which can indicate that the control domain bandwidth is the same as the system bandwidth, or a default control domain bandwidth. The frequency position of the default control domain bandwidth is as follows: r = l , the frequency position indicates the values of the fields 0 and 1, which can represent the two defaults of the control domain. Frequency location. r = 2, the frequency position indicates that the fields 00, 01, 10 and 11 have four values, which can represent the four default frequency positions of the control domain.

(2) m = 2, the bandwidth indication fields 00, 01, 10 and 11 have four values, which can represent four default control domain bandwidths. The default control domain bandwidth frequency position is as follows: r = \ , For each control domain bandwidth, the frequency position indication fields 0 and 1 can represent two default frequency positions of the control domain. r = 2, for each control domain bandwidth, the frequency position indication fields 00, 01, 10 and 11 have four values that represent the four default frequency positions of the control domain. The power in the non-control domain bandwidth and the control domain bandwidth are independently allocated, respectively, indicated by signaling. The ratio of the energy of each resource element of the pilot antenna port and the cell-specific pilot (Energy Per Resource Element, EPRE) can be set separately and indicated by signaling in the control domain bandwidth and the non-control domain bandwidth. The two ratios p _B and _{Pa of the} PDSCH EPRE and the cell-specific pilot EPRE between different OFDM symbols are respectively set in the control domain bandwidth and the non-control domain bandwidth and are respectively indicated by signaling. Figure 4 (a), Figure 4 (b), and Figure 4 (c) show three different frequency locations of the control domain when the control domain bandwidth is less than the system bandwidth.

The second embodiment physical broadcast channel carries information such as downlink carrier control domain bandwidth, PHICH settings, system frame number, and system bandwidth.

The signaling carried by the PCFICH channel indicates that the time domain resource of the control domain is the first "OFDM symbols (l ≤ w ≤ 4) in one subframe.

The PDCCH, PCFICH, and PHICH are transmitted in the control domain. The physical broadcast channel uses 3 bits to represent six control domain bandwidths of 1.25 MHz, 3 MHz, 5 MHz, 10 MHz, 15 MHz and 20 MHz. A physical broadcast channel (m≥l) bit represents 2 ^∞ types of system bandwidth. When w = l, both 0 and 1 can indicate that the control domain bandwidth is the same as the system bandwidth, or a default system bandwidth. When = 2, the bandwidth indication fields 00, 01, 10, and 11 are four values, which can indicate that the control domain bandwidth is the same as the system bandwidth, and three default system bandwidths. = 3, 000, 001, 010, 011, 100, 101, 110, and 111 can be used to indicate that the control domain bandwidth is the same as the system bandwidth, and five default system bandwidths. The power in the non-control domain bandwidth and the control domain bandwidth are independently allocated, respectively, indicated by signaling. The ratio of the pilot antenna port and the cell-specific pilot EPRE can be set separately in the control domain bandwidth and the non-control domain bandwidth, and are respectively indicated by signaling. The two ratios of the different OFDM symbol PDSCH EPRE and the cell-specific pilot EPRE? _s and their ratios in the control domain bandwidth and the non-control domain bandwidth may be separately set and respectively indicated by signaling.

The third embodiment physical broadcast channel carries information such as downlink carrier control domain bandwidth, PHICH settings, and system frame number.

The signaling carried by the PCFICH channel indicates that the time domain resource of the control domain is the first "OFDM symbols (l ≤ n ≤ 4) in one subframe.

The PDCCH, PCFICH, and PHICH are transmitted in the control domain. The physical broadcast channel uses 3 bits to represent six control domain bandwidths of 1.25 MHz, 3 MHz, 5 MHz, 10 MHz, 15 MHz, and 20 MHz. The downlink information of the downlink carrier system is carried in the system information SIB-2. The power in the non-control domain bandwidth and the control domain bandwidth are independently allocated, respectively, indicated by signaling. The ratio of the pilot antenna port and the cell-specific pilot EPRE can be set separately and indicated by signaling in the control domain bandwidth and the non-control domain bandwidth. The two ratios p _{B of the} PDSCH EPRE and the cell-specific pilot EPRE between different OFDM symbols and their ratios may be respectively set in the control domain bandwidth and the non-control domain bandwidth, and respectively indicated by signaling. It can be seen from the foregoing that the present invention provides a method for implementing a downlink carrier control domain for LTE-Advanced based on the physical channel and signal structure defined by LTE Rel-8, and the method can flexibly adjust the bandwidth of the carrier control domain. With the frequency position, the pilots at different frequency positions in the carrier and the physical downlink shared channel PDSCH are transmitted with different powers, and the interference coordination and frequency multiplexing between the cells are better realized, and the flexibility of high system scheduling is provided. Conducive to the implementation and development of LTE-Advanced systems. While the embodiments of the present invention have been described above, the described embodiments are merely for the purpose of understanding the invention and are not intended to limit the invention. Any modification and variation of the form and details of the invention may be made by those skilled in the art without departing from the spirit and scope of the invention. It is still subject to the scope defined by the appended claims.

Industrial Applicability The present invention provides a method and apparatus for implementing a downlink carrier control domain provided by LTE-Advanced, which can flexibly adjust the bandwidth and frequency position of a carrier control domain, and implement pilot and physical downlink shared channel PDSCH at different frequency positions in a carrier. With different power transmission, inter-cell interference coordination and frequency reuse are better realized, which improves the flexibility of system scheduling and is beneficial to the realization and development of LTE-Advanced system.

Claims

Claim A method for implementing a downlink carrier control domain, comprising:  The time-frequency resources on the at least one component carrier in one subframe are divided into a control domain and a non-control domain, and time-frequency resources of the control domain are set by signaling. 2. The method of claim 1 wherein:  The control domain includes at least one sub-control domain;  When there are multiple sub-control domains, the sub-control domains are frequency division multiplexed. 3. The method of claim 2, wherein:  The sub-control field is configured to transmit a physical downlink control channel, a physical control format indication channel, or a physical hybrid automatic retransmission indication channel. The method of claim 2, wherein the step of setting the time-frequency resource of the control domain by signaling comprises:  The frequency resources of the sub-control domain are set by signaling. 5. The method of claim 4, wherein:  The signaling for setting the frequency resource of the sub-control domain is carried by the physical broadcast channel or by higher layer signaling. The method of claim 2, wherein the step of setting the time-frequency resource of the control domain by signaling comprises:  The time domain location of the sub-control domain is indicated by signaling carried on the physical control format indicator channel. 7. The method of claim 1 wherein: The non-control domain is a time-frequency resource other than the control domain in a time-frequency resource. 8. The method of claim 7 wherein:  The non-control domain is configured to transmit one or more of a physical broadcast channel, a physical downlink shared channel, a primary synchronization signal, a secondary synchronization signal, and a pilot. The method of claim 7, wherein the step of setting the time-frequency resource of the control domain by signaling comprises:  The non-control domain and the control domain each independently allocate power in the non-control domain bandwidth and the control domain bandwidth, and respectively indicate the power in the non-control domain bandwidth and the control domain bandwidth by signaling. 10. A device for implementing a downlink carrier control domain, comprising:  a dividing module, configured to: divide time-frequency resources on at least one component carrier in one subframe into a control domain and a non-control domain;  The time-frequency resource setting module is configured to: set time-frequency resources of the control domain by signaling. 11. Apparatus according to claim 10 wherein:  The control domain includes at least one sub-control domain;  When there are multiple sub-control domains, the sub-control domains are frequency division multiplexed. 12. Apparatus according to claim 11 wherein:  The sub-control field is configured to transmit a physical downlink control channel, a physical control format indication channel, or a physical hybrid automatic retransmission indication channel;  The non-control domain is configured to transmit one or more of a physical broadcast channel, a physical downlink shared channel, a primary synchronization signal, a secondary synchronization signal, and a pilot. 13. Apparatus according to claim 11 wherein:  The signaling for setting the frequency resource of the sub-control domain is indicated by physical broadcast channel bearer or higher layer signaling. 14. The apparatus of claim 11, wherein the time-frequency resource setting module is set to pass The time-frequency resources of the control domain are set by signaling as follows:  The time domain location of the sub-control domain is set by signaling carried on the physical control format indicator channel. 15. The apparatus according to claim 10, wherein  The time-frequency resource setting module is further configured to: independently allocate power in the non-control domain bandwidth and control domain bandwidth, and set the non-control domain bandwidth and the power in the control domain bandwidth by signaling, respectively.