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CN102480344B - The method and system of CoMP pattern lower channel information feed back - Google Patents

The method and system of CoMP pattern lower channel information feed back Download PDF

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Publication number
CN102480344B
CN102480344B CN201010559218.2A CN201010559218A CN102480344B CN 102480344 B CN102480344 B CN 102480344B CN 201010559218 A CN201010559218 A CN 201010559218A CN 102480344 B CN102480344 B CN 102480344B
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feedback
cell
serving cell
cooperative
information
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CN102480344A (en
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孙云锋
郭森宝
陈艺戬
张晨晨
张峻峰
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ZTE Corp
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ZTE Corp
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Priority to PCT/CN2011/078127 priority patent/WO2012068905A1/en
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
    • H04L1/0023—Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the signalling
    • H04L1/0026—Transmission of channel quality indication
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/022—Site diversity; Macro-diversity
    • H04B7/024—Co-operative use of antennas of several sites, e.g. in co-ordinated multipoint or co-operative multiple-input multiple-output [MIMO] systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/0413—MIMO systems
    • H04B7/0417—Feedback systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
    • H04B7/0615—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal
    • H04B7/0619—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal using feedback from receiving side
    • H04B7/0621—Feedback content
    • H04B7/0626—Channel coefficients, e.g. channel state information [CSI]

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Quality & Reliability (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

The invention discloses a kind of method and system of CoMP pattern lower channel information feed back.In the inventive method, under coordinated multipoint transmission pattern, terminal carries out feedback of channel information to other cooperation cell outside main Serving cell and main Serving cell according to respective feedback model and/or different granularities; Described main Serving cell refers to as described user sends the community of physical down control information; Described cooperation cell refers to be needed to measure and one or more communities of feeding back channel state information.The present invention realizes the technology of feedback of channel information under CoMP pattern, all can support the feedback of channel information under CoMP pattern; Further, dynamically can support the feedback of single community CSI information feed back and multiple cell CSI information, thus the switching at runtime between different transmission technology can be adapted to.

Description

Method and system for feeding back channel information in CoMP mode
Technical Field
The present invention relates to the field of communications, and in particular, to a method and system for channel information feedback in a CoMP (coordinated multi-point transmission) mode.
Background
With the requirement of LTE-a, more and more attention is paid to the cell average spectrum efficiency and the cell edge spectrum efficiency. In contrast, the spectrum efficiency at the cell edge is the most interesting, mainly because the uplink and downlink of the LTE-a system are frequency division systems with OFDM (or some variant of OFDM) as the basic multiple access multiplexing. Unlike the conventional wireless communication system using CDMA as the basic multiple access multiplexing method, the LTE-a system has no processing gain, and there is almost no interference problem inside the cell because of complete frequency division orthogonality, but interference processing at the cell edge is relatively troublesome.
Currently, there are three methods for handling interference at the edge of a cell in LTE: 1. interference randomization; 2. interference elimination; 3. interference coordination (avoidance).
Specifically, the interference randomization method generally adopts a frequency hopping, time hopping, direct sequence spreading or code hopping method to mitigate the influence of interference among cells, and has the advantages that network planning is not needed, signaling support is hardly needed, but only interference is mitigated, and interference is not fundamentally eliminated; although the interference cancellation method can use some algorithms to cancel the interference, it generally needs additional physical entities (such as multiple antenna technology, etc.) to basically complete the interference cancellation, and sometimes these conditions may not be satisfied; the last method for coordinating (avoiding) interference in a large category is to exchange some information among cells, and use some algorithms to enable each cell to automatically select appropriate resources for transmission according to feedback information of other cells and self conditions, so as to realize efficient utilization of resources among cells, reduce the probability of resource collision utilization among cells as much as possible, finally achieve the improvement of cell edge performance, and emphasize that the interference caused by the same time-frequency resource contention among cells is avoided as much as possible. Because the antenna distances from the cell edge users to a plurality of adjacent cells are not very different, it is important to utilize the transmitting antennas of the plurality of cells to realize higher capacity and reliable transmission of the wireless links at the cell edge.
Yet another problem in coordinated multipoint transmission is that: in the same node, when there is a multi-node cooperative service user, the same cell may have a cooperative service target user and a non-cooperative service target user at the same time. The two different types of users have differences in control information design, data transmission mode, channel state information and quality information.
At present, a relatively perfect technology is not provided to support channel information feedback in a CoMP mode, so that single-cell CSI (channel state information) information feedback and multi-cell CSI information feedback cannot be dynamically supported, and dynamic switching between different transmission technologies cannot be adapted.
Disclosure of Invention
In view of the above, the present invention provides a method and a system for channel information feedback in a CoMP mode to support channel information feedback in the CoMP mode.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
a method for feeding back channel information in a CoMP coordinated multi-point transmission mode comprises the following steps: in a coordinated multi-point transmission mode, a terminal feeds back channel information to a main service cell and other coordinated cells outside the main service cell according to respective feedback modes and/or different granularities; the main service cell is a cell for sending physical downlink control information for the user; the cooperative cell refers to one or more cells that need to measure and feed back channel state information.
The feedback to the primary serving cell follows any one or more feedback modes supported in a single-cell closed-loop spatial multiplexing transmission mode: periodic wideband CQI/PMI feedback, a mode of periodic wideband CQI/PMI + subband CQI feedback, an aperiodic wideband feedback mode, a feedback mode of aperiodic UE-selected subbands, or a feedback mode of aperiodic higher-configured subbands.
Adopting respective modes for other cooperative cells outside the main serving cell means that: and when the CSI information of other cells except the main service cell is fed back, adopting a mode of broadband CQI/PMI.
The step of adopting different granularity feedback for other cooperative cells outside the main serving cell means that: and adopting a smaller codebook set and/or a smaller channel quality indication set for the cooperative cells except the main serving cell than the main serving cell.
Feeding back CSI information of other cooperative cells outside the main serving cell on a channel different from that of the main serving cell; feeding back the CSI information of the main service cell on any feedback channel adopted by a single-cell closed-loop spatial multiplexing transmission mode; periodically reporting the other cooperative cells on a physical uplink shared channel; or, the CSI information of other cooperating cells outside the primary serving cell is fed back on a different time slot from the primary serving cell.
The method further comprises the following steps: feeding back differential CQI for each cell for all or part of other cooperative cells except the main serving cell in the cooperative set; in the case that there are multiple data streams (layers), the feeding back the differential CQI for each cell means that the wideband CQI of each data stream and the primary serving cell are fed back differentially.
The timing relationship when the CSI information of other cooperative cells outside the main serving cell is fed back on a time slot different from the main serving cell is as follows: the channel information of the main service cell is fed back firstly, and the channel information of all or part of other cooperative cells is fed back respectively on the subsequent feedback time slot.
The method further comprises the following steps: when PCI between different nodes needs to be fed back and channel information of other cells is fed back on a PUSCH, feeding back the PCI information and the channel information of other cells on the same subframe; when the channel information of other cells is fed back on the PUCCH, the PCI information is fed back on a specific independent subframe or on the same subframe with the RI.
If feedback is performed on the PUCCH and phase correction PCI information needs to be fed back, the feedback period of the PCI is the same as or is an integral multiple of the RI feedback period of the rank information.
The timing relation of the PCI feedback is any one or more of the following:
a) if the RI and the PCI are fed back in the same subframe, feeding back CSI information of each cell in a cooperation set on a subframe in an RI/PCI feedback interval; the feedback timing relationship at this time is: the feedback period of the PCI or RI is M _ RI (H + Hc) Np;
b) if the PCI is fed back on an independent subframe, feeding back the CSI information feedback of each cell in the cooperation set on different time slots in the RI feedback interval; wherein the CSI information for each cell in the cooperating set comprises PCI information; the feedback timing relationship is as follows: the feedback period of RI is M _ RI (H +1+ Hc) Np;
wherein Np represents a CQI/PMI feedback period; the value of H is different under different feedback modes;
when the primary serving cell adopts the broadband-based feedback, H is 1;
when the sub-band mode is selected for the main service cell for feedback and the broadband feedback mode is adopted for other cells, H is J + K + 1; wherein J represents the number of reserved bandwidths for feeding back CQI; k represents the number of CQI fed back on the reserved bandwidth, Hc represents the number of time slots required by other cooperative cells except the main service cell in the cooperative set for feedback, and Hc is equal to the number of other cooperative cells;
when the main service cell and other cooperative cells adopt the subband selection mode for feedback, Hc is Nc H; nc represents the number of other cooperative cells to be fed back;
m _ ri is a positive integer;
c) if the feedback is performed on the PUCCH and the PCI does not need to be fed back, the feedback timing relationship at the time is as follows: and the feedback period of the RI is M _ RI (H + Hc) Np, and feedback is performed on a feedback subframe after the CSI information of the main serving cell is fed back between two time slots for feeding back the RI.
And when the PCI information needs to be fed back and the PCI feeds back on an independent time slot, the PCI feeds back on the time slot between the CSI feedback of the main service cell and the CSI feedback of other cells outside the main service cell.
A system for feeding back channel information in a CoMP mode comprises a feedback distinguishing unit, a main service cell feedback unit and a cooperative cell feedback unit; wherein,
the feedback distinguishing unit is used for confirming that the current transmission mode is in a multipoint cooperation transmission mode and informing the situation to the main service cell feedback unit and the cooperation cell feedback unit;
the main serving cell feedback unit and the cooperative cell feedback unit are used for distinguishing the main serving cell from other cooperative cells outside the main serving cell and respectively feeding back channel information to the main serving cell and the other cooperative cells outside the main serving cell according to respective feedback modes and/or different granularities;
the primary serving cell is a cell for sending physical downlink control information to the user; the cooperative cell refers to one or more cells that need to measure and feed back channel state information.
When the primary serving cell feedback unit feeds back to the primary serving cell, the primary serving cell feedback unit is configured to follow any one or more feedback modes supported in a transmission mode using single-cell closed-loop spatial multiplexing: periodic wideband CQI/PMI feedback, a mode of periodic wideband CQI/PMI + subband CQI feedback, an aperiodic wideband feedback mode, a feedback mode of aperiodic UE-selected subbands, or a feedback mode of aperiodic higher-configured subbands.
When the cooperative cell feedback unit performs feedback on other cooperative cells outside the main serving cell in respective modes, the cooperative cell feedback unit is configured to: and when the CSI information of other cells except the main service cell is fed back, adopting a mode of broadband CQI/PMI.
When the cooperative cell feedback unit performs feedback with different granularities on other cooperative cells outside the main serving cell, the cooperative cell feedback unit is configured to: and adopting a smaller codebook set and/or a smaller channel quality indication set for the cooperative cells except the main serving cell than the main serving cell.
When the main serving cell feedback unit and the cooperative cell feedback unit perform feedback, the main serving cell feedback unit and the cooperative cell feedback unit are respectively used for the corresponding cells: feeding back CSI information of other cooperative cells outside the main serving cell on a channel different from that of the main serving cell; feeding back the CSI information of the main service cell on any feedback channel adopted by a single-cell closed-loop spatial multiplexing transmission mode; periodically reporting the other cooperative cells on a physical uplink shared channel; or, the CSI information of other cooperating cells outside the primary serving cell is fed back on a different time slot from the primary serving cell.
The cooperative cell feedback unit is further configured to: feeding back differential CQI for each cell for all or part of other cooperative cells except the main serving cell in the cooperative set; in the case that there are multiple data streams (layers), the feeding back the differential CQI for each cell means that the wideband CQI of each data stream and the primary serving cell are fed back differentially.
For the CSI information of other cooperating cells outside the main serving cell, when the main serving cell feedback unit and the cooperating cell feedback unit perform feedback on a time slot different from that of the main serving cell, the main serving cell feedback unit and the cooperating cell feedback unit are configured to follow the following timing relationship with respect to their respective corresponding cells: the channel information of the main service cell is fed back firstly, and the channel information of all or part of other cooperative cells is fed back respectively on the subsequent feedback time slot.
If feedback is performed on the PUCCH and phase correction PCI information needs to be fed back, the feedback period of the PCI is the same as or is an integral multiple of the RI feedback period of the rank information.
When the primary serving cell feedback unit and the cooperative cell feedback unit perform the feedback respectively for the cells corresponding to the primary serving cell feedback unit and the cooperative cell feedback unit, the primary serving cell feedback unit and the cooperative cell feedback unit are specifically configured to apply any one or more of the following in the process of implementing the timing relationship of the PCI feedback:
a) if the RI and the PCI are fed back in the same subframe, feeding back CSI information of each cell in a cooperation set on a subframe in an RI/PCI feedback interval; the feedback timing relationship at this time is: the feedback period of the PCI or RI is M _ RI (H + Hc) Np;
b) if the PCI is fed back on an independent subframe, feeding back the CSI information feedback of each cell in the cooperation set on different time slots in the RI feedback interval; wherein the CSI information for each cell in the cooperating set comprises PCI information; the feedback timing relationship is as follows: the feedback period of RI is M _ RI (H +1+ Hc) Np;
wherein Np represents a CQI/PMI feedback period; the value of H is different under different feedback modes;
when the primary serving cell adopts the broadband-based feedback, H is 1;
when the sub-band mode is selected for the main service cell for feedback and the broadband feedback mode is adopted for other cells, H is J + K + 1; wherein J represents the number of reserved bandwidths for feeding back CQI; k represents the number of CQI fed back on the reserved bandwidth, Hc represents the number of time slots required by other cooperative cells except the main service cell in the cooperative set for feedback, and Hc is equal to the number of other cooperative cells;
when the main service cell and other cooperative cells adopt the subband selection mode for feedback, Hc is Nc H; nc represents the number of other cooperative cells to be fed back;
m _ ri is a positive integer;
c) if the feedback is performed on the PUCCH and the PCI does not need to be fed back, the feedback timing relationship at the time is as follows: and the feedback period of the RI is M _ RI (H + Hc) Np, and feedback is performed on a feedback subframe after the CSI information of the main serving cell is fed back between two time slots for feeding back the RI.
The primary serving cell feedback unit is further configured to: and when the PCI information needs to be fed back and the PCI feeds back on an independent time slot, the PCI feeds back on the time slot between the CSI feedback of the main service cell and the CSI feedback of other cells outside the main service cell.
In summary, the technology for realizing channel information feedback in the CoMP mode can support channel information feedback in the CoMP mode, regardless of the method or the system; and single-cell CSI information feedback and multi-cell CSI information feedback can be dynamically supported, so that the dynamic switching between different transmission technologies can be adapted.
Drawings
Fig. 1 is a schematic diagram of an extension method in CoMP based on a periodic wideband CQI/PMI (channel quality indicator/precoding matrix indicator) according to an embodiment of the present invention;
fig. 2 is an expanded schematic diagram in CoMP based on wideband CQI/PMI and subband CQI feedback according to an embodiment of the present invention;
fig. 3 is a flowchart illustrating channel information feedback in a CoMP mode according to an embodiment of the present invention;
fig. 4 is a system diagram of channel information feedback in a CoMP mode according to an embodiment of the present invention.
Detailed Description
In general, in the coordinated multi-point transmission mode, a UE (user equipment) may perform feedback on a primary serving cell and other cooperating cells outside the primary serving cell according to respective feedback manners and/or granularities.
For example, feedback to the primary serving cell may follow any of the feedback modes supported in the transmission mode with single-cell closed-loop spatial multiplexing. Any feedback mode supported in the single-cell closed-loop spatial multiplexing transmission mode refers to a mode of periodic wideband CQI/PMI feedback, periodic wideband CQI/PMI + subband CQI feedback, an aperiodic wideband feedback mode, a feedback mode of aperiodic UE-selected subbands, and a feedback mode of aperiodic higher-layer configured subbands. The feedback to other cooperating cells outside the main serving cell may be in different ways in different situations:
when the CSI information of other cells except the main service cell is fed back, a broadband CQI/PMI mode can be adopted; or adopting a smaller codebook set and/or a smaller channel quality indication set for cooperative cells other than the main serving cell;
of course, when CSI is fed back to a cell other than the primary serving cell, the feedback method may be the same as that of the primary serving cell.
In addition, CSI information of other cooperating cells outside the primary serving cell may be fed back on different channels. The CSI information of the primary serving cell follows any feedback mode supported in the single-cell closed-loop spatial multiplexing transmission mode, and may be periodically reported on a physical uplink shared channel (traffic channel) for other cooperating cells.
Of course, the CSI information of other cooperating cells outside the primary serving cell may also be reported in a PUCCH (physical uplink control channel) period, but the CSI information of other cooperating cells may be reported on a subframe different from the CSI information of the primary serving cell.
And, for all or part of other cooperative cells except the main serving cell in the cooperative set, a differential CQI and one PMI may be fed back for each cell. The differential CQI is a difference from the wideband CQI corresponding to the primary serving cell. When a plurality of data streams (layers) exist, the difference between the data streams and the broadband CQI of the main serving cell can be respectively carried out on the data streams; and a longer period and/or a coarser quantization granularity can be used for feedback on other part or all of the cells in the cooperation set except the main serving cell.
In addition, when the PCI between different nodes needs to be fed back and the channel information (CQI, PMI) of other cells is fed back on the PUSCH, the PCI information and the channel information of other cells may be fed back on the same subframe. When channel information (CQI, PMI) of other cells is fed back on PUCCH, the PCI information may be fed back on a specific independent subframe or on the same subframe as ri (downlink indicator).
It should be noted that, when based on coordinated multipoint transmission, CSI information feedback of different nodes may have a timing relationship, such as:
after the UE is triggered to feed back the channel information of the main service cell and other cooperative cells, the channel information of other cells is fed back in a periodic feedback mode; or after the UE is triggered to feed back the channel information of the main serving cell and other cooperative cells, feeding back the channel information of other cells once on the following k + n to k + n + m subframes. Where, k is a subframe number of the received feedback indication information, n > ═ 1, and m > ═ 0.
Specifically, if feedback is performed on the PUCCH and PCI needs to be fed back, the feedback period of the PCI is the same as or an integer multiple of the RI feedback period. The specific way of PCI feedback at this time may be:
a) and when the RI and the PCI are fed back in the same subframe, feeding back CSI information of each cell in the cooperation set on the subframe in the RI/PCI feedback interval. The feedback timing relationship at this time is: the feedback period of the PCI or RI is M _ RI (H + Hc) Np;
b) and when the PCI feeds back on the independent subframe, feeding back CSI information of each cell in the cooperation set on the subframe in the RI feedback interval. The feedback timing relationship at this time is: the feedback period of RI is M _ RI (H +1+ Hc) Np;
where Np denotes a CQI/PMI feedback period. The PCI feeds back on the subframe between the CSI feedback of the main service cell and the CSI feedback of other cells outside the main service cell.
When the primary serving cell adopts the broadband-based feedback, H is 1;
and when the subband mode feedback is selected for the main service cell and the broadband feedback mode is adopted for other cells, H is J K + 1. Wherein J represents the number of specific bandwidths for feeding back CQI; k represents the number of CQI fed back on a specific bandwidth, Hc represents the number of time slots required by other cooperative cells except the main service cell in the cooperative set for feedback, and Hc is equal to the number of other cooperative cells.
When the UE feeds back to both the primary serving cell and other cooperating cells in the subband selection manner, Hc is Nc × H, where Nc represents the number of other cooperating cells to be fed back.
M _ ri is a positive integer.
c) If the feedback is performed on the PUCCH and the PCI does not need to be fed back, the feedback timing relationship at the time is as follows: the feedback period of RI is M _ RI (H + Hc) Np, and between two subframes where RI is fed back, feedback may be performed on the feedback subframe after CSI information of the primary serving cell is fed back.
In practical application, the present invention relates to a configuration of a bearer for feedback information, a trigger configuration of a feedback mode, and a timing configuration of feedback in a transmission mode supporting CoMP. The feedback can be periodic feedback or aperiodic feedback; the feedback mode can be broadband feedback, sub-band feedback selected by the UE, and sub-band feedback configured by a higher layer.
After the UE obtains the information of the cooperation set through RRC signaling issued by the network side, the UE may perform channel measurement based on the cell list information in the cooperation set, and determine a measurement mode, a feedback mode, and a feedback timing sequence according to the configuration of the network side.
In CoMP, in order to ensure good PDCCH signal reception quality, the primary serving cell is usually the cell with the best received power. To maintain compatibility with the LTER8, R9, and R10, feedback of the primary serving cell channel information may follow the feedback scheme of the LTER8/R9/R10, or any feedback mode supported in the transmission mode of LTE-a following single-cell closed-loop spatial multiplexing. Any feedback mode supported in the single-cell closed-loop spatial multiplexing transmission mode refers to a mode of periodic wideband CQI/PMI feedback, periodic wideband CQI/PMI + subband CQI feedback, an aperiodic wideband feedback mode, a feedback mode of aperiodic UE-selected subbands, and a feedback mode of aperiodic higher-layer configured subbands.
In order to reduce the overhead, for other cooperative cells except the main serving cell, the following two ways of compressing the feedback overhead are given:
1) for other cooperative cells outside the main serving cell, only the wideband CQI and PMI are fed back, and the wideband CQI and PMI are referred to herein as: when the UE is configured to report the CQI, the UE only reports the CQI of one broadband based on a plurality of transmission sub-bands; when PMI needs to be reported, the UE only reports one PMI based on a plurality of transmission sub-bands.
2) And configuring different CQI and PMI feedback granularities for other cooperative cells outside the main serving cell. For example: of the primary serving cellCorresponding to the same one of the cooperating cellsOf the primary serving cellCorresponding to the same one of the cooperating cellsWherein k is 2.
And when the UE is triggered to perform other cell CSI feedback, the UE starts to perform feedback on a PUCCH or PUSCH periodically. The period for feeding back the CSI information of other cells is the same as the period for feeding back RI by the UE; or, after the UE is triggered each time, the CSI information of other cooperating cells is fed back only once.
In order to support the dynamic switching between single-cell transmission and multi-cell transmission, the following methods can be applied to feedback the information of other cells.
Mode 1: the feedback to other cells outside the primary serving cell is triggered by the CoMP-supported transmission mode and the cooperating set size. When the cooperation set is larger than 1, feeding back channel information of other cells; otherwise, no feedback is performed. The CS/CB and the JP adopt a unified mode for feedback, namely, the CS/CB and the JP respectively carry out independent feedback on each cell for the cooperative cells outside the main service cell and respectively feed back the information of CQI, BCI and/or WCI of each cooperative cell; and meanwhile, the PCI of each cell relative to the main service cell is fed back.
Mode 2: determining whether the feedback carries out channel information feedback according to a single cell or channel information feedback according to multiple cells through the configuration of a transmission mode and a cooperation set; meanwhile, signaling is added to indicate whether feedback is performed based on JP or CS/CB. When feedback is carried out according to JP, for other cells except the main service cell, the CQI and BCI information of each cooperative cell is fed back, and when the signal related transmission of each cell is needed, the PCI of each cell relative to the main service cell is fed back at the same time; when feeding back according to CB, feeding back CQI and WCI information of each cooperative cell for other cells except the main service cell. In this method, the purpose of reducing feedback overhead is achieved by adding indication information to downlink signaling, and the indication information may be configured on RRC signaling or PDCCH.
When the indication information is carried in RRC signaling, a PCI feedback indication information, pcifeedbaccator, may be added to the CQI-ReportConfig of the radio resource control IE entry: BOOLEAN; when the indication information is carried in the PDCCH signaling, the indication information may be added in support of CoMP transmission DCIformat (downlink control information format), for example, 1bit is used to indicate whether to feed back the PCI.
Mode 3: and the implicit mode is adopted for notification. Such as: according to the sub-frame number nfThe channel information of the CSCB or JP transmission mode is fed back and single cell feedback/multi cell feedback according to predefined criteria. For example: may be according to the subframe number nfCircularly feeding back other cooperative cells according to CSCB and JP modes in the feedback periods of the two main service cells RI; of course, CQI feedback to other cooperating cells outside the primary serving cellThe feedback overhead may also be reduced by differentiating the CQI with the primary serving cell.
For the correlation operation performed by the feedback described above, reference may be made to the following embodiments.
Example 1: periodic feedback extension
In the periodic feedback, for the channel information of other cooperating cells, when the channel information of other cells is fed back on the PUCCH, the configuration may be performed in the following manner.
1. CQI and PMI feedback with wideband, as shown in fig. 1;
in the method 1), Mri is configured, where Mri is a parameter indicating the RI transmission period configuration, and the CQIs/PMIs of the primary serving cell and the cooperating cell are fed back between two times of feeding back RI. When the PCI needs to be fed back, the PCI may be fed back in an independent feedback period between the primary serving cell feedback CQI/PMI and the cooperative cell feedback CQI/PMI (as in mode 1 in fig. 1). In this extension mode, the Mri value configured by the higher layer needs to be greater than or equal to the period required by the wideband CQI/PMI and PCI feedback of the primary serving cell and the cooperative cell.
In the mode 2), the feedback of the PCI and the feedback of the RI are performed on the same subframe, and the CQIs/PMIs of the primary serving cell and other cooperating cells are fed back between two RI/PCI feedback periods (as in the mode 2 in fig. 1). In this extension mode, the Mri value configured by the higher layer needs to be greater than or equal to the period required by the wideband CQI/PMI feedback of the primary serving cell and the cooperative cell.
In the method 1), when the PCI does not need to be fed back, the CQI/PMI information of the cooperative cell is fed back at a corresponding position. In addition, N in the figurepA feedback period representing CQI/PMI; the feedback period offset of the RI refers to an offset of feedback of the RI with respect to CQI feedback, and the offset is 0 or some negative value.
In the extended mode based on wideband CQI/PMI feedback, the period of two RI information feedbacks is M _ RI (1+ Hc) × Np (when PCI and RI feedback in the same timeslot) or M _ RI (1+1+ Hc) × Np (PCI feeds back in an independent timeslot);
2. extension based on wideband CQI/PMI and sub-band CQI feedback, as shown in fig. 2;
in the method 1), when the PCI needs to be fed back, the PCI feeds back on an independent CQI feedback slot, and the feedback slot is between the CSI information feedback of the primary serving cell and the CSI information feedback of the cooperative cell. And the cooperative cell feeds back the CSI of the main service cell and the Np period of Hc after PCI feedback. Wherein Hc corresponds to the number of cooperative cells that need to be fed back.
In the method 2, when the PCI needs to be fed back, the PCI and the RI perform feedback in the same time slot, and the cooperative cell performs feedback in the Np period of Hc after CSI feedback of the primary serving cell. Wherein Hc corresponds to the number of cooperative cells that need to be fed back.
Also, in FIG. 2, N is shownpA feedback period representing CQI/PMI; the feedback period offset of the RI refers to an offset of feedback of the RI with respect to CQI feedback, and the offset is 0 or some negative value.
More specifically, the feedback method under different conditions based on the wideband CQI/PMI and the subband CQI feedback extension method includes:
1) and when the PCI needs to be fed back and the RI and the PCI are fed back in the same subframe, feeding back CSI information of the main serving cell and other cooperative cells on the subframe in the RI/PCI feedback interval. The feedback timing relationship at this time is: the feedback period of the PCI and/or RI is M _ RI (H + Hc) Np;
2) when the PCI performs feedback on an independent subframe, the CSI information of the primary serving cell and other cooperating cells is fed back on the subframe within the RI feedback interval. If PCI needs to be fed back, the feedback timing relationship at this time is as follows: the feedback period of RI is M _ RI (H +1+ Hc) Np; if PCI does not need to be fed back, the feedback timing relationship at this time is as follows: the feedback period of RI is M _ RI (H + Hc) Np.
Wherein Np represents the feedback period of CQI; h represents the number of feedback cycles required for feeding back the wideband CQI/PMI and the subband CQI of the primary serving cell, and H is J × K + 1. Wherein J represents the number of specific bandwidths for feeding back CQI; k represents the number of CQI fed back on a specific bandwidth; hc represents the number of other cooperation cells except the main service cell in the cooperation set required by feedback; m _ ri is a positive integer.
When the UE feeds back information to both the main serving cell and other cooperating cells in a subband selection manner, Hc is Nc × H, Nc represents the number of other cooperating cells to be fed back, and Hc represents the number of feedback periods required for feeding back information of other cells outside the main serving cell.
Example 2: PUSCH feedback extension
In lte 8, feedback on the PUSCH for CSI information exists only in two cases, one is that uplink shared data exists during periodic feedback, and the CSI information is transmitted on the PUSCH in the same format as the feedback on the PUCCH. In another case, the feedback is aperiodic, and when aperiodic feedback is configured in the PDCCH, CSI information is fed back according to an aperiodic feedback mode configured in a higher layer. In general, aperiodic feedback is performed only in two cases:
when the DCIformat of downlink transmission is 0 and the CQI request in the DCIformat0 is set to 1;
when the CQI request for random access corresponding grant is set to 1.
When the extension to CoMP is considered, a case where the CQI request in the downlink DCIformat0 is set to 1 is mainly considered. In practical application, two PUSCH feedback manners may be considered respectively:
mode 1), an aperiodic PUSCH feedback mode based on a UE request. And the UE sends an uplink scheduling request and feeds back according to the uplink authorization of the network side.
Mode 2), based on the aperiodic PUSCH feedback configured on the network side, the minimum interval is 1 ms.
As for the above-mentioned mode 1) and mode 2), the network side may also perform configuration periodically or the UE may request periodically. In this case, the degradation is to periodic PUSCH feedback.
When performing channel coding, the feedback information of the primary serving cell and the feedback information of the cooperative cell may be jointly coded, that is, the channel information (CQI/PMI) of the primary serving cell and (CQI/PMI) of the other cooperative cells and the optional PCI are jointly channel coded, and are separately channel coded with HARQ-ACK/NACK (automatic repeat request-acknowledgement/Non-acknowledgement, hybrid automatic repeat request-acknowledgement/Non-acknowledgement), and RI. HARQ-ACK, RI, channel information (CQI/PMI) of the main serving cell, and channel information of other cooperating cells may be independently channel-coded.
Specifically, when the wideband CQI feedback is extended, the wideband CQI and PMI may be calculated for each cooperative cell according to the same subband division method as that of the primary serving cell, and the rank corresponding to the calculation of the CQI/PMI may be the same as that of the primary serving cell.
When the sub-band feedback selected by the UE is expanded, when the higher layer configuration adopts the feedback mode 2-0 (the UE selects sub-band feedback and does not feed back PMI), the UE calculates only the wideband CQI of the cooperative cell, and the calculation of the wideband CQI of the cooperative cell may calculate the CQI based on only the codeword stream 1 or calculate 2 CQIs based on different codeword streams, respectively. And, a differential value with the primary serving cell wideband CQI may be fed back.
In addition, when the higher layer configuration adopts feedback mode 2-2(UE selects subband feedback and feeds back PMI), the UE may calculate only one wideband PMI and wideband CQI, which may be calculated individually based on codeword stream 1 or on each codeword stream.
When the sub-band feedback expansion based on the high-level configuration is performed, when the high-level configuration adopts a feedback mode 3-0 (the high-level configuration sub-band feedback and the PMI is not fed back), the UE can only calculate the wideband CQI of the cooperative cell, and the operation mode is similar to the operation mode 2-0; the calculation of the wideband CQI of the cooperative cell can be based on the code word stream 1 only or each code word stream. And, a differential value with the primary serving cell wideband CQI may be fed back.
In addition, when the higher layer configuration adopts the feedback mode 3-1 (the higher layer configuration subband feedback and feeds back the PMI), the UE may calculate only one wideband PMI and wideband CQI, which may be calculated individually based on the codeword stream 1 or on each codeword stream.
As can be seen from the above technical contents, the operation concept of channel information feedback in CoMP mode according to the present invention can be represented as shown in fig. 3. Referring to fig. 3, fig. 3 is a flowchart of channel information feedback in a CoMP mode according to an embodiment of the present invention, where the flowchart includes the following steps:
step 310: in the coordinated multi-point transmission mode, a main service cell and other coordinated cells outside the main service cell are distinguished.
Step 320: and the terminal feeds back the channel information to the main service cell and other cooperative cells outside the main service cell according to respective feedback modes and/or different granularities.
In order to ensure that the technical contents can be successfully realized, the arrangement shown in fig. 4 can be carried out. Referring to fig. 4, fig. 4 is a system diagram of channel information feedback in a CoMP mode according to an embodiment of the present invention, where the system includes a feedback distinguishing unit, and a primary serving cell feedback unit and a cooperative cell feedback unit connected thereto, and both of the units may be disposed in a functional entity for performing channel information feedback, such as a UE.
In practical application, the feedback distinguishing unit can confirm that the current transmission mode is in the coordinated multi-point transmission mode, and inform the feedback distinguishing unit of the main service cell and the feedback distinguishing unit of the coordinated cell of the situation; the main serving cell feedback unit and the cooperative cell feedback unit distinguish the main serving cell from other cooperative cells outside the main serving cell, and perform channel information feedback on the main serving cell and other cooperative cells outside the main serving cell according to respective feedback modes and/or different granularities. The primary serving cell is a cell for sending physical downlink control information to the user; the cooperative cell refers to one or more cells that need to measure and feed back channel state information.
It should be noted that, when the primary serving cell feedback unit feeds back to the primary serving cell, the primary serving cell feedback unit is configured to follow any one or more feedback modes supported in the transmission mode of single-cell closed-loop spatial multiplexing: periodic wideband CQI/PMI feedback, a mode of periodic wideband CQI/PMI + subband CQI feedback, an aperiodic wideband feedback mode, a feedback mode of aperiodic UE-selected subbands, or a feedback mode of aperiodic higher-configured subbands.
When the cooperative cell feedback unit performs feedback on other cooperative cells outside the main serving cell in respective modes, the cooperative cell feedback unit is configured to: and when the CSI information of other cells except the main service cell is fed back, adopting a mode of broadband CQI/PMI.
When the cooperative cell feedback unit performs feedback with different granularities on other cooperative cells outside the main serving cell, the cooperative cell feedback unit is configured to: and adopting a smaller codebook set and/or a smaller channel quality indication set for the cooperative cells except the main serving cell than the main serving cell.
When the main serving cell feedback unit and the cooperative cell feedback unit perform feedback, the main serving cell feedback unit and the cooperative cell feedback unit are respectively used for the corresponding cells: feeding back CSI information of other cooperative cells outside the main serving cell on a channel different from that of the main serving cell; feeding back the CSI information of the main service cell on any feedback channel adopted by a single-cell closed-loop spatial multiplexing transmission mode; periodically reporting the other cooperative cells on a physical uplink shared channel;
or, the CSI information of other cooperating cells outside the primary serving cell is fed back on a different time slot from the primary serving cell.
The cooperative cell feedback unit is further configured to: feeding back differential CQI for each cell for all or part of other cooperative cells except the main serving cell in the cooperative set;
in the case that there are multiple data streams (layers), the feeding back the differential CQI for each cell means that the wideband CQI of each data stream and the primary serving cell are fed back differentially.
For the CSI information of other cooperating cells outside the main serving cell, when the main serving cell feedback unit and the cooperating cell feedback unit perform feedback on a time slot different from that of the main serving cell, the main serving cell feedback unit and the cooperating cell feedback unit are configured to follow the following timing relationship with respect to their respective corresponding cells: the channel information of the main service cell is fed back firstly, and the channel information of all or part of other cooperative cells is fed back respectively on the subsequent feedback time slot.
If feedback is performed on the PUCCH and phase correction PCI information needs to be fed back, the feedback period of the PCI is the same as or is an integral multiple of the RI feedback period of the rank information.
When the primary serving cell feedback unit and the cooperative cell feedback unit perform the feedback respectively for the cells corresponding to the primary serving cell feedback unit and the cooperative cell feedback unit, the primary serving cell feedback unit and the cooperative cell feedback unit are specifically configured to apply any one or more of the following in the process of implementing the timing relationship of the PCI feedback:
a) if the RI and the PCI are fed back in the same subframe, feeding back CSI information of each cell in a cooperation set on a subframe in an RI/PCI feedback interval; the feedback timing relationship at this time is: the feedback period of the PCI or RI is M _ RI (H + Hc) Np;
b) if the PCI is fed back on an independent subframe, feeding back the CSI information feedback of each cell in the cooperation set on different time slots in the RI feedback interval; wherein the CSI information for each cell in the cooperating set comprises PCI information; the feedback timing relationship is as follows: the feedback period of RI is M _ RI (H +1+ Hc) Np;
wherein Np represents a CQI/PMI feedback period; the value of H is different under different feedback modes;
when the primary serving cell adopts the broadband-based feedback, H is 1;
when the sub-band mode is selected for the main service cell for feedback and the broadband feedback mode is adopted for other cells, H is J + K + 1; wherein J represents the number of reserved bandwidths for feeding back CQI; k represents the number of CQI fed back on the reserved bandwidth, Hc represents the number of time slots required by other cooperative cells except the main service cell in the cooperative set for feedback, and Hc is equal to the number of other cooperative cells;
when the main service cell and other cooperative cells adopt the subband selection mode for feedback, Hc is Nc H; nc represents the number of other cooperative cells to be fed back;
m _ ri is a positive integer;
c) if the feedback is performed on the PUCCH and the PCI does not need to be fed back, the feedback timing relationship at the time is as follows: and the feedback period of the RI is M _ RI (H + Hc) Np, and feedback is performed on a feedback subframe after the CSI information of the main serving cell is fed back between two time slots for feeding back the RI.
The primary serving cell feedback unit is further configured to: and when the PCI information needs to be fed back and the PCI feeds back on an independent time slot, the PCI feeds back on the time slot between the CSI feedback of the main service cell and the CSI feedback of other cells outside the main service cell.
In summary, the technology for realizing channel information feedback in the CoMP mode can support channel information feedback in the CoMP mode, regardless of the method or the system; and single-cell CSI information feedback and multi-cell CSI information feedback can be dynamically supported, so that the dynamic switching between different transmission technologies can be adapted.
The above description is only exemplary of the present invention and should not be taken as limiting the scope of the present invention, and any modifications, equivalents, improvements, etc. that are within the spirit and principle of the present invention should be included in the present invention.

Claims (19)

1. A method for feeding back channel information in a CoMP coordinated multi-point transmission mode is characterized by comprising the following steps:
in a coordinated multi-point transmission mode, a terminal feeds back channel information to a main service cell and other coordinated cells outside the main service cell according to respective feedback modes and/or different granularities;
the main service cell is a cell for sending physical downlink control information for a user; the cooperative cell refers to one or more cells which need to measure and feed back channel state information;
the method further comprises the following steps:
feeding back differential CQI for each cell for all or part of other cooperative cells except the main serving cell in the cooperative set;
in the case that there are multiple data streams (layers), the feeding back the differential CQI for each cell means that the wideband CQI of each data stream and the primary serving cell are fed back differentially.
2. The method of claim 1,
the feedback to the primary serving cell follows any one or more feedback modes supported in a single-cell closed-loop spatial multiplexing transmission mode:
periodic wideband CQI/PMI feedback, a mode of periodic wideband CQI/PMI + subband CQI feedback, an aperiodic wideband feedback mode, a feedback mode of aperiodic UE-selected subbands, or a feedback mode of aperiodic higher-configured subbands.
3. The method of claim 1,
adopting respective modes for other cooperative cells outside the main serving cell means that:
and when the CSI information of other cells except the main service cell is fed back, adopting a mode of broadband CQI/PMI.
4. The method of claim 1,
the step of adopting different granularity feedback for other cooperative cells outside the main serving cell means that:
and adopting a smaller codebook set and/or a smaller channel quality indication set for the cooperative cells except the main serving cell than the main serving cell.
5. The method according to claim 3 or 4,
feeding back CSI information of other cooperative cells outside the main serving cell on a channel different from that of the main serving cell; feeding back the CSI information of the main service cell on any feedback channel adopted by a single-cell closed-loop spatial multiplexing transmission mode; periodically reporting the other cooperative cells on a physical uplink shared channel;
or, the CSI information of other cooperating cells outside the primary serving cell is fed back on a different time slot from the primary serving cell.
6. The method of claim 5,
the timing relationship when the CSI information of other cooperative cells outside the main serving cell is fed back on a time slot different from the main serving cell is as follows:
the channel information of the main service cell is fed back firstly, and the channel information of all or part of other cooperative cells is fed back respectively on the subsequent feedback time slot.
7. The method of claim 1, further comprising:
when PCI between different nodes needs to be fed back and channel information of other cells is fed back on a PUSCH, feeding back the PCI information and the channel information of other cells on the same subframe;
when the channel information of other cells is fed back on the PUCCH, the PCI information is fed back on a specific independent subframe or on the same subframe with the RI.
8. The method of claim 6 or 7, wherein if feedback is performed on PUCCH and phase correction PCI information needs to be fed back, the feedback period of PCI is the same as or an integer multiple of the RI feedback period of Rank Information (RI).
9. The method of claim 8, further characterized in that the timing relationship of the PCI feedback is any one or more of the following:
a) if the RI and the PCI are fed back in the same subframe, feeding back CSI information of each cell in a cooperation set on a subframe in an RI/PCI feedback interval; the feedback timing relationship at this time is: the feedback period of the PCI or RI is M _ RI (H + Hc) Np;
b) if the PCI is fed back on an independent subframe, feeding back the CSI information feedback of each cell in the cooperation set on different time slots in the RI feedback interval; wherein the CSI information for each cell in the cooperating set comprises PCI information; the feedback timing relationship is as follows: the feedback period of RI is M _ RI (H +1+ Hc) Np;
wherein Np represents a CQI/PMI feedback period; the value of H is different under different feedback modes;
when the primary serving cell adopts the broadband-based feedback, H is 1;
when the sub-band mode is selected for the main service cell for feedback and the broadband feedback mode is adopted for other cells, H is J + K + 1; wherein J represents the number of reserved bandwidths for feeding back CQI; k represents the number of CQI fed back on the reserved bandwidth, Hc represents the number of time slots required by other cooperative cells except the main service cell in the cooperative set for feedback, and Hc is equal to the number of other cooperative cells;
when the main service cell and other cooperative cells adopt the subband selection mode for feedback, Hc is Nc H; nc represents the number of other cooperative cells to be fed back;
m _ ri is a positive integer;
c) if the feedback is performed on the PUCCH and the PCI does not need to be fed back, the feedback timing relationship at the time is as follows: and the feedback period of the RI is M _ RI (H + Hc) Np, and feedback is performed on a feedback subframe after the CSI information of the main serving cell is fed back between two time slots for feeding back the RI.
10. The method of claim 9,
and when the PCI information needs to be fed back and the PCI feeds back on an independent time slot, the PCI feeds back on the time slot between the CSI feedback of the main service cell and the CSI feedback of other cells outside the main service cell.
11. A system for feeding back channel information in a CoMP mode is characterized by comprising a feedback distinguishing unit, a main service cell feedback unit and a cooperative cell feedback unit; wherein,
the feedback distinguishing unit is used for confirming that the current transmission mode is in a multipoint cooperation transmission mode and informing the situation to the main service cell feedback unit and the cooperation cell feedback unit;
the main serving cell feedback unit and the cooperative cell feedback unit are used for distinguishing the main serving cell from other cooperative cells outside the main serving cell and respectively feeding back channel information to the main serving cell and the other cooperative cells outside the main serving cell according to respective feedback modes and/or different granularities;
the main service cell is a cell for sending physical downlink control information for a user; the cooperative cell refers to one or more cells which need to measure and feed back channel state information;
the cooperative cell feedback unit is further configured to:
feeding back differential CQI for each cell for all or part of other cooperative cells except the main serving cell in the cooperative set;
in the case that there are multiple data streams (layers), the feeding back the differential CQI for each cell means that the wideband CQI of each data stream and the primary serving cell are fed back differentially.
12. The system of claim 11,
when the primary serving cell feedback unit feeds back to the primary serving cell, the primary serving cell feedback unit is configured to follow any one or more feedback modes supported in a transmission mode using single-cell closed-loop spatial multiplexing:
periodic wideband CQI/PMI feedback, a mode of periodic wideband CQI/PMI + subband CQI feedback, an aperiodic wideband feedback mode, a feedback mode of aperiodic UE-selected subbands, or a feedback mode of aperiodic higher-configured subbands.
13. The system according to claim 12, wherein the cooperative cell feedback unit is configured to, when performing respective mode feedback on other cooperative cells except the primary serving cell:
and when the CSI information of other cells except the main service cell is fed back, adopting a mode of broadband CQI/PMI.
14. The system according to claim 12, wherein the cooperative cell feedback unit is configured to, when applying different granularity feedback to other cooperative cells outside the primary serving cell:
and adopting a smaller codebook set and/or a smaller channel quality indication set for the cooperative cells except the main serving cell than the main serving cell.
15. The system according to claim 13 or 14, wherein the primary serving cell feedback unit and the cooperative cell feedback unit, when feeding back, are configured to, for their corresponding cells:
feeding back CSI information of other cooperative cells outside the main serving cell on a channel different from that of the main serving cell; feeding back the CSI information of the main service cell on any feedback channel adopted by a single-cell closed-loop spatial multiplexing transmission mode; periodically reporting the other cooperative cells on a physical uplink shared channel;
or, the CSI information of other cooperating cells outside the primary serving cell is fed back on a different time slot from the primary serving cell.
16. The system according to claim 15, wherein for CSI information of other cooperating cells except the primary serving cell, when the primary serving cell feedback unit and the cooperating cell feedback unit perform feedback on a time slot different from that of the primary serving cell, the primary serving cell feedback unit and the cooperating cell feedback unit are configured to follow the following timing relationship for their corresponding cells:
the channel information of the main service cell is fed back firstly, and the channel information of all or part of other cooperative cells is fed back respectively on the subsequent feedback time slot.
17. The system of claim 16, wherein if feedback is performed on PUCCH and phase correction PCI information needs to be fed back, a feedback period of PCI is the same as or an integer multiple of a rank information RI feedback period.
18. The system according to claim 17, wherein when the primary serving cell feedback unit and the cooperative cell feedback unit perform the feedback respectively for the cells corresponding to themselves, any one or more of the following are specifically used in the process of implementing the timing relationship of the PCI feedback:
a) if the RI and the PCI are fed back in the same subframe, feeding back CSI information of each cell in a cooperation set on a subframe in an RI/PCI feedback interval; the feedback timing relationship at this time is: the feedback period of the PCI or RI is M _ RI (H + Hc) Np;
b) if the PCI is fed back on an independent subframe, feeding back the CSI information feedback of each cell in the cooperation set on different time slots in the RI feedback interval; wherein the CSI information for each cell in the cooperating set comprises PCI information; the feedback timing relationship is as follows: the feedback period of RI is M _ RI (H +1+ Hc) Np;
wherein Np represents a CQI/PMI feedback period; the value of H is different under different feedback modes;
when the primary serving cell adopts the broadband-based feedback, H is 1;
when the sub-band mode is selected for the main service cell for feedback and the broadband feedback mode is adopted for other cells, H is J + K + 1; wherein J represents the number of reserved bandwidths for feeding back CQI; k represents the number of CQI fed back on the reserved bandwidth, Hc represents the number of time slots required by other cooperative cells except the main service cell in the cooperative set for feedback, and Hc is equal to the number of other cooperative cells;
when the main service cell and other cooperative cells adopt the subband selection mode for feedback, Hc is Nc H; nc represents the number of other cooperative cells to be fed back;
m _ ri is a positive integer;
c) if the feedback is performed on the PUCCH and the PCI does not need to be fed back, the feedback timing relationship at the time is as follows: and the feedback period of the RI is M _ RI (H + Hc) Np, and feedback is performed on a feedback subframe after the CSI information of the main serving cell is fed back between two time slots for feeding back the RI.
19. The system of claim 18, wherein the primary serving cell feedback unit is further configured to:
and when the PCI information needs to be fed back and the PCI feeds back on an independent time slot, the PCI feeds back on the time slot between the CSI feedback of the main service cell and the CSI feedback of other cells outside the main service cell.
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