WO2012010045A1

WO2012010045A1 - Method and device for feeding back channel information in coordinated multi-point transmission

Info

Publication number: WO2012010045A1
Application number: PCT/CN2011/076511
Authority: WO
Inventors: 郭森宝; 孙云锋; 张峻峰
Original assignee: 中兴通讯股份有限公司
Priority date: 2010-07-23
Filing date: 2011-06-28
Publication date: 2012-01-26
Also published as: CN102340383A; CN102340383B

Abstract

The present invention discloses a method and a device for feeding back channel information in coordinated multi-point (CoMP) transmission, and solves the technical problem of uploading channel information of a plurality of coordinated cells or of cells in a measurement set in CoMP transmission. When channel information, for the same user equipment (UE), of all coordinated cells or of all cells in the measurement set is fed back, the present invention allocates a plurality of subframes for feeding back the channel information of all coordinated cells or of all cells in the measurement set, wherein channel information of at most only one coordinated cell or one cell in the measurement set is mapped in each subframe, or one subframe is allocated for feeding back the channel information of all coordinated cells or of all cells in the measurement set, or a plurality of subframes are allocated for feeding back the channel information of all coordinated cells or of all cells in the measurement set, wherein channel information of a plurality of coordinated cells or of a plurality of cells in the measurement set is mapped in each subframe.

Description

Method and device for feeding channel information in multi-point coordinated transmission

The present invention relates to a Long Term Evolution Advanced System (LTE-A), and in particular to a method and a device for feeding back channel information of a coordinated cell or a measurement set cell in multi-cell cooperation in an LTE-A system. . Background technique

In LTE-A, in order to improve the average spectrum utilization of the cell and the spectrum utilization of the cell edge, Coordinated Multi Point Transmission/Reception (COMP) technology and multi-antenna enhancement technology are adopted. The COMP technology is divided into CB (Cooperative Beamforming) and JT (Joint Transmission) technologies, which can greatly improve the average spectral efficiency of the cell and the quality of service of the cell edge users. In particular, the JT technology can largely guarantee the quality of user service in the poor quality of the cell edge channel. Currently, both CS/CB and JT need to feed back channel information of multiple cells. In the LTE R8/R9 protocol version, the user equipment (UE) only needs to feed back the channel quality information and precoding information of the serving cell.

The bearer content generation process of the feedback channel information on the physical uplink shared channel (PUSCH) in the LTE R8/R9 protocol version is as follows:

Step 1. Calculate the number of symbols required for channel information by using Equation 1.

(Equation 1) where o is the number of bits of the serving cell channel information. The total number of bearers is:

"0" 0 0 ≤ 11

L

2 _cei = 0^2', and 18 otherwise , L is the number of check bits of the CRC. ^M M ¹ To schedule the upstream bandwidth, ^N and N _symb are the number of symbols to be scheduled, and ^^ is the modulation and coding offset of the scheduled channel quality indicator (CQI). C is the number of code blocks, which is the length of each code block.

² «The number of bits occupied by RI is the number of constellation bits of the modulation scheme. Where 0 is different depending on the feedback mode, the number of bits of feedback may be different. The feedback mode can be divided into broadband feedback, UE-specified sub-band feedback, and high-level configuration feedback.

Step 2. Perform channel coding and rate matching on the calculated number of channel information feedback bits. When the number of bits of the channel information is less than 11, the block coding of (32, 0) is used, otherwise the tail biting convolutional coding is used; then the rate matching process using the same rate matching process as the uplink control information is used for rate matching.

Step 3. Perform multiplexing of data and control information.

Step 4. Perform channel interleaving.

Step 5. Perform scrambling.

Step 6. Perform modulation, precoding, and resource mapping to generate OFDM symbols and send them to the receiving end from different antennas.

The bearer content generation process of the feedback channel information on the physical uplink control channel (PUCCH) of LTE R8/R9 is as follows:

Step 1. Determine the number of bits required for channel information through different feedback modes. The specific feedback modes can be divided into: wideband feedback and sub-band feedback selected by the UE.

Step 2. Perform channel coding of (20, A) on the bits of the channel information, but require the number of bits of the channel information to be less than or equal to 11 (considering the hybrid coding of 2 bits of HARQ bits and channel information).

Step 3. Perform scrambling on the encoded channel information bits.

Step 4. Perform constellation mapping, modulate into 10 constellation symbols, and then multiply with the cyclic delay sequence to obtain a frequency domain extended sequence.

Step 5: Perform power adjustment and resource mapping (channel information of one UE is only carried on one CQI channel). Step 6. The OFDM symbol generates and sends uplink control information from different antennas to the receiving end. In the periodic feedback process of R8 and R9, firstly, a wideband channel information is fed back, and then the channel information of the subband is fed back in the interval of two feedback wideband channel information. If only the wideband channel information is configured, the reporting entity subframe of the wideband channel information satisfies: ( ^10xn / +L ¹² \ ~ ^N OFFSET, CQI ) ^N _P =. , for the system frame number, for the slot number, N _OFFSET>CQI for the subframe offset, ^Λ ^ for the feedback period. If both the wideband channel information and the subband channel information are configured, both the wideband channel information and the subband channel information are satisfied: (iGx

C), the period of the wideband channel information is · ^, that is, when the subframe satisfies ( ^1Q X "/ + k ¹² " - ) ^m ° ^d ( ^ff · W _P ) = 0, H = J . K ₊ 1 , Is the number of bandwidth parts. Between two consecutive channel information reports, the advertised entity is used as the sub-band channel information of the 4 advertised loop, and if the sub-band channel information has not been transmitted before the second wideband channel information is transmitted, The remaining subband channel information is not transmitted, and the channel information of the optimal subband selected by the first bandwidth portion is sequentially added to the channel information of the selected optimal subband in the first bandwidth portion, and K is indicated by the upper layer signal. .

When in a COMP transmission, the UE may simultaneously transmit multiple coordinated cells or measure channel information of a cell in the set, in which case the uplink carries more feedback bits, and the base station (eNB) passes the high-level letter in R8 and R9. Let only one CQI channel allocated to one UE on the PUCCH be used to transmit channel information of the serving cell, and each CQI channel supports channel information of llbits at most. For COMP, these resources are far from enough, and there is no design or discussion on how the serving cell needs to inform the UE which channel information of the cells and the channel information of these cells are allocated on the resources. Therefore, the original standard is no longer suitable for COMP eNBs and UEs, and the necessary expansion of standard content is required. Summary of the invention

In view of this, the main object of the present invention is to provide a method and apparatus for feeding back channel information in coordinated multi-point transmission, which is used to solve multiple coordinated cells or measurement sets in COMP transmission. Technical problem of channel information uploading of a cell within the cell. In order to achieve the above object, the technical solution of the present invention is achieved as follows:

A channel letter, packet and feedback method for multi-point coordinated transmission, the method comprising:

In COMP transmission, channel information for all cooperating cells or all cells in the measurement set for the same UE is fed back in any of the following ways:

Method A: Allocating multiple subframes for feeding back channel information of all coordinated cells or all cells in the measurement set, but each subframe only maps at most one coordinated cell or channel information of one cell in the measurement set;

Manner B: allocating one subframe for feeding back channel information of all coordinated cells or all cells in the measurement set;

Manner C: Allocating multiple subframes for feeding back channel information of all coordinated cells or all cells in the measurement set, but mapping multiple coordinated cells or measuring channel information of multiple cells in the set in each subframe.

Further, the method further includes: the base station notifying the UE by using the PDCCH or the high layer signaling to feed back the channel information of the coordinated cell or the cell in the measurement set, and notifying the UE to map the subframe information of the channel information and the location information of the resource. Preferably, the high layer signaling passes a physical uplink control channel configuration field (PUCCH-Config) of a radio resource control message or a radio resource control message, a physical uplink shared channel configuration field (PUSCH-Config) or a channel quality indicator report configuration field. (CQI-ReportConfig) for transmission.

Further, the method further includes: the base station adaptively adjusting the feedback mode according to different application scenarios and system load conditions, and notifying the UE of the feedback manner of the decision by using the high layer signaling, where the specific method is:

If the COMP cooperation set is slow, or the delay requirement is not strict, or the same UE can continuously allocate multiple uplink subframes, or the time interval of the latest multiple uplink subframes is small, etc., the base station Select feedback method A; If the COMP cooperation set requires strict delay, or cannot allocate multiple consecutive uplink subframes, or the time interval of the most recent uplink subframes is large, and the uplink data information is not loaded, the system load is small, and the like. Then the base station selects feedback mode B;

If the conditions in the above two cases are not satisfied, the base station selects the feedback mode C.

Further, when the mode A is used, different uplink subframes are allocated for feeding back channel information of different coordinated cells or cells in the measurement set; the allocation method of the uplink subframe is any one of the following:

(1) allocating a plurality of consecutive uplink subframes for feedback of channel information of a plurality of coordinated cells or a plurality of cells within the measurement set;

(2) A plurality of uplink subframes having the latest allocation time interval are used for feedback of channel information of a plurality of coordinated cells or a plurality of cells within the measurement set.

When mode B is used, the same (i.e., the same) uplink subframe is allocated for feeding back channel information of all the cells in the cooperative cell or the measurement set.

When mode C is used, multiple identical uplink subframes are allocated to complete feedback of channel information of all COMP measurement set cells, and each uplink subframe feeds back part of the coordinated cell or the channel information of the partial cells in the measurement set.

For the mode B and the mode C, in the case that the coordinated cell or the cell channel information in the measurement set is fed back on the PUSCH, in the bearer content generating process, before the multiplexing of the data and the control information, the method further includes:

Step B11: Calculate the number of bits of channel information of each coordinated cell or a cell in the measurement set. Step B12: perform channel coding and rate matching for each cell respectively.

Step B13: After channel coding and rate matching, channel information of multiple cells is multiplexed, that is, the coded bit sequences of each cell are cascaded according to a certain cell order.

For mode B and mode C, in the case of feeding back a coordinated cell or measuring cell channel information in a set on a PUSCH, according to a preferred embodiment of the present invention, in the process of generating a bearer content, Before multiplexing the row data and control information, it also includes:

Step B21: Calculate the total number of channel information bits of the coordinated cell or the cell in the measurement set η ·,

Step Β22, interleaving channel information;

Step Β23: segment the number of bits of the total channel information of the inter-complexed coordinated cell or the measurement set by the number of cells to be fed back, and then perform channel coding and rate matching on the number of channel information feedback bits calculated in each segment respectively. After the channel coding and rate matching, segmentation is performed;

Step Β24: Interleaving the channel information again after the data bits outputted by the segment cascading, this step is an optional step.

The method for performing resource mapping by the UE in the process of generating the bearer content in the process of generating the content of the bearer in the case of the bearer content generation is as follows:

The base station notifies the starting channel index of the channel quality indicator (CQI) channel of the UE by using the high layer signaling, and the plurality of consecutive or fixed intervals or fixed from the starting CQI channel position when the UE performs channel information resource mapping. Mapping feedback channel information on different CQI channels that are not equally spaced; or

The base station notifies the UE which CQI channels are used by the high layer signaling, and the UE maps the feedback channel information on the notified CQI channel; or

The base station and the UE agree on a fixed CQI channel allocation pattern, and the UE maps the channel information fed back according to the fixed CQI channel allocation pattern.

Preferably, in the bearer content generation process, before the UE performs resource mapping, the channel coding of the bits of the channel information of each cell further includes the step of interleaving the channel information.

Preferably, before channel coding the channel information in the bearer content generating process, the method further includes the following steps: performing channel information interleaving on the obtained channel information of each single cell, The woven channel information is segmented, and the channel coding process of the channel information is performed after segmentation. Based on the method of the present invention, the present invention further provides a feedback device for channel information in coordinated multi-point transmission. As shown in FIG. 9, the device is used in COMP transmission, and the device includes:

a decision unit, located at a base station, used to determine a feedback manner of channel information of a coordinated cell or a cell in the measurement set, and determines resource mapping information according to a feedback manner of the decision;

a notification unit, located at the base station, for notifying the feedback unit of the decision result of the decision unit by using the PDCCH or the high layer signaling;

a feedback unit, located in the UE, configured to feed back, by using a specified feedback manner, the channel information of the performed coordinated cell or the cell in the measurement set to the base station on the specified resource according to the decision result of the decision unit;

The feedback manner is any one of the following ways:

Further, the determining unit adaptively determines a feedback manner used according to different application scenarios and system load conditions, and the specific method is:

If the COMP cooperation set is slow, or the delay requirement is not strict, or the time interval for the same UE to continuously allocate multiple uplink subframes or the most recent uplink subframes is small, then the selection is performed. Mode A;

If the COMP collaboration set requires strict delay, or cannot allocate multiple consecutive uplink subframes, Or the time interval of the most recent uplink subframes is large, and the load of the uplink data information is not large, and the system load is small, then the mode B is selected;

If the conditions in both cases are not satisfied, then the mode C is selected.

Further, the resource mapping information includes: which cooperative cells or which channel information in the measurement set are fed back by the decision unit, and in which subframe or which coordinated cells or measurement sets are mapped or which subframe or Which cell channel information.

Further, when the decision unit decides to use the mode A, the decision unit allocates different uplink subframes for feeding back channel information of different coordinated cells or cells in the measurement set.

Further, when the decision unit decides to use the mode B, the decision unit allocates the same uplink subframe for feeding back channel information of all coordinated cells or all cells in the measurement set.

Further, when the decision unit decides to use the mode C, the decision unit allocates multiple identical uplink subframes to complete feedback of channel information of all COMP measurement set cells, and each uplink subframe feedback part The coordinated cell or the channel information of the partial cell within the measurement set.

The invention solves the problem of channel information uploading of cells in multiple coordinated cells or measurement sets by extending the LTE R8/R9 protocol. DRAWINGS

1 is a feedback flowchart of channel information based on feedback mode A according to the present invention;

2 and FIG. 5 are schematic diagrams of periodic feedback of broadband and sub-band channel information of a primary serving cell based on feedback mode A, and cell broadband channel information in a coordinated cell or a measurement set; FIG. 3 and FIG. 4 are feedback methods according to the present invention. A periodic feedback of A's spatial and sub-band channel information in the primary serving cell and the coordinated cell or measurement set;

6 is a feedback cooperative cell or measurement set on a PUSCH according to a feedback mode B according to the present invention; a flow chart for generating bearer content of cell channel information within the combination;

7 is a flowchart of generating bearer content of a cell channel information in a coordinated cell or a measurement set on a PUSCH based on a feedback mode B according to the present invention;

8 is a flow chart of generating bearer content of channel information of a cell in a cooperative cell or a measurement set on a PUCCH of LTE R8/R9 based on feedback mode B according to the present invention;

FIG. 9 is a structural diagram of an apparatus for implementing channel information feedback in coordinated multi-point transmission according to the present invention. detailed description

The present invention will be further described in detail below with reference to the accompanying drawings.

Embodiment 1:

This embodiment is directed to the feedback mode A. In the feedback mode, the base station allocates multiple subframes to jointly complete feedback of channel information of all cells in the COMP measurement set, and each subframe only maps channel quality information of one cell. Based on the feedback method A, the feedback process of the channel information is shown in Figure 1. The specific steps are as follows:

Step 101: The eNB informs the UE through the physical downlink control channel (PDCCH) or the high layer signaling, which coordinated cells or which cells in the measurement set are channel information (ie, the range of the measurement set), and in which subframe, which coordinated cell is fed back Or measuring channel information of a cell in the set, and mapping on the resource or resources of the cell in the subframe or the cell in the set;

Step 102: After receiving the measurement set indication, the UE uses the feedback allocated by the base station for feedback.

The COMP measures the subframe position of the channel information of all cells in the set and the correspondence between the cell and the subframe, and the resource mapping position indicated by the base station in the subframe, and maps the feedback channel information on the designated uplink subframe.

If it is an aperiodic feedback mode, the UE feeds back the coordinated cell or the measurement set on consecutive subframes after the channel information of the primary serving cell is fed back or on several subframes with the latest time interval. Channel information of the inner cell.

If the channel is in the periodic broadband feedback mode, the UE may feed back multiple coordinated cells or measure the bandwidth of multiple cells in the set on consecutive different subframes or in the latest subframes after the channel information of the primary serving cell is fed back. Channel information, the period of each cell channel information may be the same or different, but the subframe offset is different.

If it is a feedback mode of periodic broadband and sub-band common feedback, only the sub-band channel information of the primary serving cell may be fed back. In this case, it may be considered to feed back the coordinated cell or the cell in the measurement set after the end of the broadband channel information of the feedback primary serving cell. The broadband channel information, and then feedback the sub-band channel information of the multiple primary serving cells, and in R8 and R9, feedback the channel information of each sub-band between the broadband channel information of the adjacent feedback primary serving cell, and then feedback The polling repeated transmission factor of the sub-band channel information is that when the COMP user receives the value, an adjustment amount is calculated according to the number of BPs (bandwidth part) and the number of cells in the coordinated cell or the measurement set (which may also be an eNB high-level configuration). And then repeating the polling feedback channel information of each serving cell sub-band after feeding back the broadband channel information of the cells in each coordinated cell or measurement set. It is also possible not to perform the calculation of ^ and related configuration or adjustment. If the sub-band channel information of the primary serving cell has not been transmitted yet when the broadband channel information of the primary serving cell arrives, the remaining primary serving cell sub-band channel information is not transmitted. As shown in FIG. 2 and FIG. 5, the invention is not limited thereto, wherein Cell1 is a primary serving cell, CellN represents CSI information of the Nth cell, and HN represents a number of sub-band CSIs of the Nth cell.

If it is a feedback mode of periodic broadband and sub-band common feedback, both the sub-band channel information of the primary serving cell and the sub-band channel information of the cell in the coordinated set may be fed back.

Feeding the wideband channel information of the primary serving cell on the subframe of ^, and feeding back the subband channel information of the primary serving cell on the subframe satisfying ( ^10x? V + ² ′ - ^N oFFSET, c _e n ) mod N _Pl = Q, And the first coordinated cell is fed back on the subframe that satisfies (10 X + L / 2" _ N _{0FFSET CQn} ) mod (H ₂ ' 2 ) = ⁰ or Measuring the broadband channel information of the cells in the set, satisfying

(10 X + L" _s / ² ′ - N _{0FFSET: CQI2} ) ^mo d ₂ = Q sub-frame feedback on the first coordinated cell or the sub-band channel information of the cell in the measurement set, and so on, while satisfying (10x/i, +L?i _s /2"_N _£rcei w)m. The broadband channel information of the Nth coordinated cell or the cell in the measurement set is fed back in the subframe of d(H ₂ 'N _P w) ^{= 0} , and satisfies (10 X _W/ + L ^ / 2 J - N _{0FFS cQIN} ) The sub-band channel information of the Nth coordinated cell or the cell in the measurement set is fed back on the subframe with mod N _PN = 0. Where W ^ W is the subframe offset of the cells in different coordinated cells or measurement sets, ^'· is the feedback period of different cells, and the values satisfying 1 ≤ N may be the same or different, and may be biased by the pair Set the calculation, that is, the amount of adjustment for a sub-frame relative to ^^^. There are many possible combinations of such configurations, and only two possible illustrations are given in Figures 3 and 4, but the invention is not limited to these two.

Embodiment 2:

This embodiment is directed to mode B. In the feedback mode, the base station allocates one subframe for feeding back channel information of all coordinated cells or all cells in the measurement set. In this manner, the delay can be minimized and can be performed faster. A multi-point collaboration process. In this mode, the feedback overhead of an uplink subframe needs to be increased, and the related feedback contents of the original R8 and R9 need to be expanded. The method of expansion can be:

FIG. 6 is a flowchart of generating a bearer content of a cell channel information in a coordinated cell or a measurement set on a PUSCH according to the present invention:

Q' = min

Where o is the number of bits of channel information of each coordinated cell or cell in the measurement set, and Q ' is the number of channel information bits to be transmitted on the PUSCH; the total number of bearer bits is:

_ ίο 0 < 11

Ce, — and , otherwise, _L is the number of check bits of the _CRC .

j n

To schedule the upstream bandwidth, N _symb is the number of symbols to be scheduled, and ^^ is the scheduled CQI modulation coding offset. C is the number of code blocks, which is the length of each code block. Channel rank indication

( RI ) The number of modulation symbols occupied is the number of constellation bits of the modulation scheme. Where 0 varies depending on the feedback mode, and the number of bits fed back may be different. The feedback mode can be divided into broadband feedback, UE-specified sub-band feedback, and high-level configuration feedback.

Step 602: After calculating the number of feedback bits of the channel information of the cells in each coordinated cell or measurement set, perform channel coding and rate matching for the channel information of each cell.

When the number of feedback bits of the channel information is less than 11, the block coding of (32, 0) is used, otherwise the tail biting convolutional coding is used, and then the rate matching process using the same rate matching process as the uplink control information is used for rate matching. After channel coding and rate matching of channel information of each cell are completed, channel information of multiple cells is multiplexed, that is, the coded bit sequences of the respective cells are cascaded according to a certain cell order. The number of data bits output at this time is equivalent to the number of data bits of a single cell of a factor of two, and is the number of cells for multi-point coordinated measurement.

Optionally, after the step, the channel information of the multiple cells is interleaved, and the order of the channel information of each cell may be disrupted, and the frequency diversity and the time diversity gain are fully utilized.

Step 603: Perform multiplexing of data and control information.

Step 604: Perform channel interleaving.

Step 605, performing scrambling.

Step 606: Perform modulation, precoding, resource mapping, generate OFDM symbols, and send them to the receiving end from different antennas.

This method has less modification to R8, but does not make full use of time and frequency diversity gain. Embodiment 3:

This embodiment is directed to mode B. In the feedback mode, the base station allocates one subframe for feeding back channel information of all coordinated cells or all cells in the measurement set, which requires an additional uplink subframe feedback overhead, and needs to be R8 and R9. The content of the feedback is expanded. The method of expansion can be:

FIG. 7 is a process for generating bearer content of the cell channel information in the coordinated cell or the measurement set on the PUSCH according to the embodiment:

Step 701: Calculate the total number of channel information bits of the cell in the coordinated cell or the measurement set.

^β ' is the number of channel information bits to be transmitted on the PUSCH;

^e , L is the number of check bits of the CRC. , - for scheduling ups, ^Ν , ^Ν for n CQl

The number of symbols scheduled to modulate the coding offset for the scheduled channel information. C is the number of code blocks, which is the length of each code block. 3⁄4„ is the number of modulation symbols occupied by _RI , which is the number of constellation bits of the modulation scheme. 0 depends on different feedback modes, the number of feedback bits may be different. The feedback mode can be divided into wideband feedback, UE-specified subband feedback and high-level Configuration feedback.

Step 702: Perform interleaving of channel information.

By interleaving the channel information, the order of the channels of the respective cells can be disrupted, the frequency diversity and time diversity can be fully utilized, and the interleaving can be omitted.

Step 703: Segment the channel information after the interleaving, and the length of each segment is: 0 ' ^{= 0 IN} ^ , where 0 is the number of bits of the total channel information of the cell in the coordinated cell or the measurement set, ^Ν ^ is feedback Number of cells; then channel coding and rate matching for each segment respectively. When the number of bits of the channel information is less than 11, block coding with (32, 0), otherwise use tail biting convolutional coding, and then use Rate matching is performed by the same rate matching process as the uplink control information; after channel coding and rate matching, segmentation is performed, and the number of data bits output is equivalent to N times the number of data bits of a single cell, and N is a measurement. The number of cells.

Step 704: Perform interleaving of channel information.

Interleaving channel information can disrupt the order of channel information of each cell, making full use of frequency diversity and time diversity. This step is optional or not interleaved.

Step 705: Perform multiplexing of data and control information.

Step 706: Perform channel interleaving.

Step 707, performing scrambling.

Step 708: Perform modulation, precoding, and resource mapping to generate OFDM symbols and send them to the receiving end from different antennas.

Embodiment 4:

This embodiment is directed to mode B, which needs to augment the relevant feedback content of the original R8 and R9. First, the base station notifies the UE of the coordinated cell or measurement set to be fed back through the high layer signaling, and the UE learns the measurement set, and the UE The bearer content generation process of the channel information of the cell in the coordinated cell or the measurement set on the PUCCH of the LTE R8/R9 is as follows: Step 801: Determine the number of bits required for each single cell channel information by using different feedback modes. . The specific feedback modes can be divided into: wideband feedback and sub-band feedback selected by the UE.

Step 802: Perform channel coding of (20, A) bits of channel information of each cell, but require that the number of bits of channel information of each cell is less than or equal to 11;

Optionally, before the step, the obtained channel information of each single cell may be interleaved by channel information, and then the interleaved channel information is segmented, and the number of information bits of each segment after segmentation shall be less than or equal to 11, Channel coding after segmentation, channel information interleaving It is to make full use of frequency diversity and time diversity.

Optionally, after the 802 step, the channel-coded information bits may be interleaved, and then the segments segmented into a plurality of bits of the number 20 respectively correspond to different CQI channels.

Step 803: Perform scrambling on the encoded channel information bits.

Step 804: Perform constellation mapping, modulate into 10 constellation symbols, and then multiply with the cyclic delay sequence to obtain a frequency domain extended sequence.

Step 805: Perform power adjustment and resource mapping, where the resource mapping is to be mapped to multiple CQI channels, that is, the base station needs to notify the UE through the PDCCH or higher layer signaling to measure the range of the collection and which CQI channels to occupy. It should be noted that multiple CQI channels can be carried in one uplink subframe, but multiple CQI channels are allocated to different UEs. In the existing protocol, each UE can only occupy one CQI channel, and the present invention needs to Notifying a UE to occupy multiple CQI channels in a dominant or implicit manner by the base station, mapping the channel information of the coordinated cell or the cell in the measurement set to be fed back on multiple CQI channels.

In order to have a small impact on the standard, the high-level signaling may be used to notify only the starting channel index of the CQI channel of the UE, and the UE places the feedback channel information according to the number of cells in the measurement set, that is, multiple consecutive starts from the starting CQI channel position. Or the channel information of the feedback is placed on different CQI channels with fixed or equal intervals or fixed unequal intervals, so that the high layer signaling is the same as R8; or the base station notifies the UE which CQI channels are used by the high layer signaling, and the UE is notified. The channel information of the feedback is mapped on the CQI channel; or the base station and the UE agree on a fixed CQI channel allocation pattern, and the UE maps the feedback channel information according to the fixed CQI channel allocation pattern, and the base station and the UE may also agree on multiple fixed CQI channels. The allocation pattern, the base station informs the UE by several bits to select a different CQI channel allocation pattern.

Step 806: The OFDM symbol generates and sends uplink control information from different antennas to the receiving end.

Embodiment 5: This embodiment is directed to mode B, which needs to augment the relevant feedback content of the original R8 and R9. First, the base station notifies the UE of the coordinated cell or measurement set to be fed back through the high layer signaling, and after the UE learns the measurement set, The bearer content generation process of the channel information of the cell in the coordinated cooperative cell or the measurement set on the PUCCH of the LTE R8/R9 is as follows:

Step 901: Determine, by using different feedback modes, the number of bits required for each single cell channel information. The specific feedback modes can be divided into: wideband feedback and sub-band feedback selected by the UE.

Step 902: Perform channel coding of (20, A) on the bits of the channel information of each cell, but require the number of bits of the channel information of each cell to be less than or equal to 11.

Optionally, before the step, the obtained channel information of each single cell may be interleaved by channel information, and then the interleaved channel information is segmented, and the number of information bits of each segment after segmentation shall be less than or equal to 11, Channel coding is performed after segmentation, and the purpose of channel information interleaving is to make full use of frequency diversity and time diversity.

Step 903: Perform scrambling or non-scrambling on the encoded channel information bits, and then perform interleaving (interleaving may use matrix interleaving or random interleaving, etc.) to allocate channel information of different cells to different CQI channels to obtain Better frequency diversity gain.

Step 904: Perform constellation mapping, modulate into 10 constellation symbols, and then multiply with the cyclic delay sequence to obtain a frequency domain extended sequence.

Step 905: Perform power adjustment and resource mapping. At this time, the resource mapping is mapped to multiple CQI channels, that is, the base station needs to pre-high-level signaling to notify the UE which CQI channels to occupy. In order to have a small impact on the standard, the high-level signaling may be used to notify only the starting channel index of the CQI channel of the UE, and the UE sequentially places the channel information into different CQI channels by measuring the number of cells in the set. The eNB also reserves a plurality of CQI channels for the implicit notification for the UE, and the implicit notification method is completed by using the starting channel index of the CQI channel and the number of cells in the measurement set. of. The UE places channel information on a plurality of consecutive or fixed equally spaced or fixed unequal intervals of different CQI channels starting from the starting CQI channel position by measuring the number of cells in the set. This high-level signaling is the same as R8. The eNB high-level signaling may also be used to notify the UE of different CQI channels. These CQI channels may be discontinuous, and the CQI channel allocation pattern fixed by the eNB and the UE may be used or a different CQI may be selected through several bit notifications. Channel assignment pattern.

Step 906: The OFDM symbol generates and sends uplink control information from different antennas to the receiving end.

Example 6:

In this embodiment, the channel information of the partial coordinated cell of the same UE or the partial cell of the measurement set is fed back in the same uplink subframe, and the channel information of all the COMP measurement set cells is completed by using multiple uplink subframes. Feedback. The specific method can be:

The eNB may inform the UE which channel information on which cells to feed back, that is, the eNB informs the UE on which subframes the channel information of which cells are transmitted through higher layer signaling. For example, the eNB instructs the UE to feed back the channel information of the cell index 1-3 on the first uplink subframe, and to feed back the channel information of the cell index 4-6 on the second uplink subframe. It may also be a default feedback method of the eNB and the UE, such as channel information of several cells that are continuously indexed by one subframe. It is also possible to perform feedback according to the multiplexing factor of the channel state information pilot (CSI-RS), for example, there are 6 measurement cells, and the multiplexing factor of the CSI-RS is 3, which only needs to feed back 3 coordinated cells per subframe or The channel information of the cells in the set is measured, and the channel information of the three coordinated cells or the cells in the measurement set is fed back in the next feedback subframe. At this time, it is necessary to extend the feedback mode of R8 and R9. The expansion method can refer to the expansion method given in the implementation of the second, third, fourth, and fifth.

Example 7:

In this embodiment, the base station adaptively adjusts the feedback scheme according to different application scenarios and system load conditions, and notifies the feedback manner of the decision to the UE through high layer signaling, and the UE determines the base station by The feed mode feeds back the channel information of the coordinated cell or the cell in the measurement set to the base station. The method for the base station adaptive adjustment feedback scheme may be:

(1) If the base station determines that the COMP cooperation set is slow, or the delay requirement is not strict, or that multiple uplink subframes may be continuously allocated, or the time interval of multiple uplink subframes is small, then feedback is selected. Mode A, that is, using multiple subframes to feed back channel information of all coordinated cells or all cells in the measurement set, but each subframe only feeds back at most one coordinated cell or channel information of one cell in the measurement set.

(2) If the base station determines that the COMP cooperation set has strict delay requirements, or cannot allocate multiple consecutive uplink subframes, or multiple uplink subframes have large time intervals, and the uplink data information is not heavily loaded, the system load is relatively large. If the value is small, the feedback mode B is selected, that is, the channel information of all the cells in the coordinated cell or the measurement set is fed back in one subframe.

(3) If the base station determines that the above requirements are not met, then the feedback mode C is selected, that is, multiple subframes are used to feed back channel information of all coordinated cells or all cells in the measurement set, but feedback part of the coordinated cells in one subframe or Measuring channel information of some cells in the set

The eNB determines which feedback mode is used in the specific mode, B, and C by the requirements of the uplink data load, the system load, and the system delay, and notifies the UE through the high layer signaling.

The high layer signaling referred to in the foregoing embodiment may be selected to pass the radio resource control message, and may further select a PUCCH-Config field, a PUSCH-Config field or a CQI-ReportConfig field in the radio resource control message for transmission.

Example 8:

FIG. 9 is a schematic diagram of a structure of a feedback device for channel information in a coordinated multi-point transmission according to the present invention. The device is used in a COMP transmission, and includes: a decision unit, a notification unit, and a feedback unit.

The determining unit is located at a base station, where the unit is used for determining a feedback manner of the channel information of the cell in the coordinated cell or the measurement set, and determining the resource mapping information according to the feedback manner of the decision; the feedback mode is any one of the following manners. : Mode A, allocating multiple subframes for feeding back channel information of all cells in the coordinated cell or the measurement set, but mapping at most one coordinated cell or channel information of one cell in the measurement set in each subframe;

The resource mapping information includes: which of the coordinated cells or which cells in the measurement set are fed back by the decision unit, and in which subframe or which cooperative cell or which cell in the measurement set is mapped.

The decision unit adaptively determines the feedback mode used according to different application scenarios and system load conditions, and the specific method is: if the COMP cooperation set is slow, or the delay requirement is not strict, or can be for the same UE If the time interval between consecutively allocating multiple uplink subframes or the most recent uplink subframes is small, the mode A is selected; if the COMP cooperation set requires strict delay, or multiple consecutive uplink subframes cannot be allocated, or If the time interval of the most recent uplink subframes is large, and the load of the uplink data information is not large, and the system load is small, the mode B is selected; if the conditions in the above two cases are not satisfied, the Mode C.

The notification unit is located at a base station, and the unit is configured to notify, by using a PDCCH or a high layer signaling, a decision result of the decision unit to the feedback unit;

The feedback unit is located at the UE, and the unit is configured to feed back, according to the decision result of the decision unit, the channel information of the cell in the coordinated cell or the measurement set to the base station on the specified resource by using a specified feedback manner;

When the decision unit decides to use the mode A, the decision unit allocates different uplink subframes for feeding back channel information of different coordinated cells or cells in the measurement set. Dang When the decision unit decides to use the mode B, the decision unit allocates the same uplink subframe for feeding back channel information of all coordinated cells or all cells in the measurement set. When the decision unit decides to use the mode C, the decision unit allocates multiple identical uplink subframes to complete feedback of channel information of all COMP measurement set cells, and each uplink subframe feeds back part of the coordinated cell or Channel information of a part of cells within the set is measured.

When the feedback unit feeds back the coordinated cell or the cell channel information in the measurement set on the PUSCH and the PUCCH, the bearer content generating process is the same as the second embodiment to the fifth embodiment, and is not described here.

The above is only the preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes can be made to the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention. Any method related to the multi-point collaborative feedback method used herein should be included in the scope of the present invention. Industrial applicability

The invention provides a method and a device for feeding back channel information in multi-point coordinated transmission. The invention provides a feedback method for channel information in a multi-point coordinated transmission by extending the LTE R8/R9 protocol, and solves the problem in COMP. In the transmission, the technical problem of channel information uploading of multiple coordinated cells or cells in the measurement set.

Claims

Claim

A method for feeding back channel information in multi-point coordinated transmission, comprising: in a coordinated multi-point transmission COMP, feeding back all coordinated cells or measurement sets for the same UE in any of the following manners: Channel information for all cells:

2. The method according to claim 1, wherein the method further comprises:

The base station notifies the UE to feed back the channel information of the coordinated cell or the cell in the measurement set by using the physical downlink control channel PDCCH or the high layer signaling, and notifies the UE to map the subframe information of the channel information and the location information of the resource.

The method according to claim 1, wherein the method further comprises: the base station adaptively adjusting the feedback mode according to different application scenarios and system load conditions, and notifying the UE of the feedback manner of the decision by the high layer signaling, by :

If the COMP cooperation set is slow, or the delay requirement is not strict, or the time interval for which the same UE can continuously allocate multiple uplink subframes or the latest multiple uplink subframes is small, the base station selects a feedback manner. A;

If the COMP cooperation set requires strict delay, or cannot allocate multiple consecutive uplink subframes, or the time interval of the most recent uplink subframes is large, and the uplink data information is not heavily loaded, If the system load is small, the base station selects feedback mode B;

The method according to claim 2, wherein when the mode A is used, different uplink subframes are allocated for feeding back channel information of different coordinated cells or cells in the measurement set; Any one:

The method according to claim 2, wherein when the mode B is used, the same uplink subframe is allocated for feeding back channel information of all the cells in the coordinated cell or the measurement set.

The method according to claim 2, wherein when the mode C is used, multiple identical uplink subframes are allocated to complete feedback of channel information of all COMP measurement set cells, and each uplink subframe feedback part cooperates. The cell or the channel information of the partial cell within the measurement set.

The method according to claim 5 or 6, wherein, in the case that the coordinated channel or the cell channel information in the measurement set is fed back on the physical uplink shared channel PUSCH, the data and the control information are complexed in the bearer content generating process. Also included before use:

B11. Calculate a number of bits of channel information of each coordinated cell or a cell in the measurement set. B12. Perform channel coding and rate matching for each cell respectively.

B13. After channel coding and rate matching, channel information of multiple cells is multiplexed, that is, the coded bit sequences of each cell are cascaded according to a certain cell order.

The method according to claim 5 or 6, wherein, in the case that the coordinated cell is measured on the PUSCH or the cell channel information in the set is measured, in the bearer content generating process, before multiplexing the data and the control information, the method further includes :

B21. Calculate a total number of channel information bits of a cell in the coordinated cell or the measurement set. B22. Interleave channel information.

B23. Segment the number of bits of the channel information of the inter-interleaved coordinated cell or the cell in the measurement set by using the number of cells to be fed back, and then perform channel coding and rate matching on the number of channel information feedback bits calculated in each segment respectively; After channel coding and rate matching, segmentation cascades are performed.

9. The method according to claim 8, wherein after step B23, the method further comprises the step of: interleaving the channel information again after the data bits outputted by the segmentation.

The method according to claim 5 or 6, wherein, in the case that the coordinated cell or the cell channel information in the measurement set is fed back on the physical uplink control channel PUCCH, the method for the UE to perform resource mapping in the bearer content generating process For:

The base station notifies the UE of the channel quality indication starting channel index of the CQI channel by using the high layer signaling, and the UE maps multiple consecutive or fixed equally spaced CQI channels starting from the starting CQI channel position when performing channel information resource mapping. Feedback channel information; or,

The method according to claim 10, wherein before the channel coding of the channel information in the bearer content generation process, the method further comprises:

The obtained channel information of each single cell is interleaved by channel information, the interleaved channel information is segmented, and the channel coding process of the channel information is performed after segmentation.

The method according to claim 10, wherein, in the bearer content generating process, before the UE performs resource mapping, the channel coding of the bits of the channel information of each cell further includes the step of interleaving the channel information.

13. The method according to claim 2, wherein the high layer signaling passes a radio resource control message or a physical uplink control channel configuration field of a radio resource control message The PUCCH-Config, physical uplink shared channel configuration field PUSCH-Config or channel quality indicator report configuration field CQI-ReportConfig is transmitted.

14. A feedback device for channel information in coordinated multi-point transmission, the device comprising:

The feedback manner is any one of the following ways:

The device according to claim 14, wherein the decision unit adaptively determines the feedback mode used according to different application scenarios and system load conditions, by:

If the COMP cooperation set is slow, or the delay requirement is not strict, or the time interval for consecutively allocating multiple uplink subframes or the most recent uplink subframes for the same UE is small, then the manner is selected. A; If the COMP cooperation set requires strict delay, or cannot allocate multiple consecutive uplink subframes, or the time interval of the most recent uplink subframes is large, and the uplink data information is not loaded and the system load is small, then the selection is performed. The mode B;

If the conditions in both cases are not satisfied, then the mode C is selected.

The device according to claim 14, wherein the resource mapping information comprises: which of the coordinated cells or which cells in the measurement set are fed back by the decision unit, and which subframe is mapped on which subframe or Which coordinated cells or channel information of which cell or cells within the measurement set.

The apparatus according to claim 14, wherein, when the decision unit decides to use the mode A, the decision unit allocates different uplink subframes for feeding back different cells or measuring cells in the set. Channel information.

18. The apparatus according to claim 14, wherein, when the decision unit decides to use the mode B, the decision unit allocates the same uplink subframe for feeding back all coordinated cells or all cells in the measurement set. Channel information.

The apparatus according to claim 14, wherein, when the decision unit decides to use the mode C, the decision unit allocates a plurality of identical uplink subframes together to complete channel information for all COMP measurement set cells. Feedback, each uplink subframe feeds back part of the coordinated cell or the channel information of the partial cell within the measurement set.