CN102340383B - The feedback method of channel information and device in a kind of coordinated multipoint transmission - Google Patents

The feedback method of channel information and device in a kind of coordinated multipoint transmission Download PDF

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CN102340383B
CN102340383B CN201010238548.1A CN201010238548A CN102340383B CN 102340383 B CN102340383 B CN 102340383B CN 201010238548 A CN201010238548 A CN 201010238548A CN 102340383 B CN102340383 B CN 102340383B
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channel information
cells
cell
measurement set
channel
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CN102340383A (en
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郭森宝
孙云锋
张峻峰
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ZTE Corp
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ZTE Corp
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/04—Wireless resource allocation
    • 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
    • H04B7/06—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]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W24/00—Supervisory, monitoring or testing arrangements
    • H04W24/10—Scheduling measurement reports ; Arrangements for measurement reports

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  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

The invention discloses feedback method and the device of channel information in a kind of coordinated multipoint transmission, for solving in COMP transmission, the problem that the channel information of the community in multiple cooperation cell or measuring assembly is uploaded.Occupation mode A of the present invention, B or C feed back the channel information of the community in multiple cooperation cell or measuring assembly, mode A distributes multiple subframe for feeding back the channel information of all communities in all cooperation cell or measuring assembly, but each subframe at most only maps the channel information of a community in a cooperation cell or measuring assembly; Mode B is that distribution subframe is for feeding back the channel information of all communities in all cooperation cell or measuring assembly; Mode C and mode A different are the channel information of cell portion in demapping section cooperation cell in each subframe or measuring assembly.The present invention expands LTE R8/R9, and the channel information solving the community in multiple cooperation cell or measuring assembly uploads problem.

Description

Feedback method and device of channel information in multipoint cooperative transmission
Technical Field
The present invention relates to a Long term evolution advanced system (LTE-a), and more particularly, to a method and an apparatus for feeding back channel information of a cell in a coordinated cell or a cell in a measurement set when multiple cells are coordinated in the LTE-a system.
Background
In LTE-a, in order to improve the average spectrum utilization of a cell and the spectrum utilization of a cell edge, a Coordinated Multi Point Transmission/Reception (COMP) technology and a Multi-antenna enhancement technology are used. The COMP technology is divided into CB (cooperative beam forming) and JT (joint transmission) technologies, which can improve the average spectrum efficiency of a cell and the service quality of cell-edge users to a great extent. Especially, JT technology can ensure the service quality of users at the location with poor channel quality at the cell edge to a great extent. Currently, channel information of multiple cells needs to be fed back regardless of CS/CB or JT. 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 generation process of the load-bearing content of the feedback channel information on the Physical Uplink Shared Channel (PUSCH) in the LTE R8/R9 protocol version is as follows:
step 1, calculating the number of symbols required for channel information by using formula 1
(formula 1)
Where O is the number of bits of the serving cell channel information. The total number of bearer bits is: qCQI＝QmQ', andl is the number of check bits of the CRC.In order to schedule the uplink bandwidth,for the number of symbols to be scheduled,a modulation coding offset for a scheduled Channel Quality Indication (CQI). C is the number of code blocks, KrIs the length of each code block. QRINumber of bits occupied by RI, QmIs the number of constellation bits of the modulation scheme. Wherein, the bit number of the feedback may be different according to different feedback modes. The feedback mode can be divided into broadband feedback, UE-specific subband feedback, and higher-layer configured feedback.
And 2, carrying out channel coding and rate matching on the calculated channel information feedback bit number. When the bit number of the channel information is less than 11, adopting block coding of (32, O), otherwise adopting tail-biting convolutional coding; and then carrying out rate matching by adopting a rate matching process which is the same as the uplink control information.
And 3, multiplexing the data and the control information.
And 4, carrying out channel interleaving.
And 5, scrambling.
And 6, modulating, precoding and resource mapping are carried out, OFDM symbols are generated and are sent to a receiving end from different antennas.
The generation process of the load-bearing content of the feedback channel information on the Physical Uplink Control Channel (PUCCH) of the LTE R8/R9 is as follows:
step 1, determining the number of bits required by the channel information through different feedback modes. The specific feedback modes can be divided into: broadband feedback and UE-selected subband feedback.
Step 2, channel coding (20, a) is performed on the bits of the channel information, but the number of bits of the channel information is required to be equal to or less than 11 (considering the hybrid coding of the HARQ bits of 2bits and the channel information).
And 3, scrambling the coded channel information bits.
And 4, constellation mapping is carried out, 10 constellation symbols are modulated, and then the constellation symbols are multiplied by the cyclic delay sequence to obtain a sequence after frequency domain expansion.
And step 5, carrying out power adjustment and resource mapping (the channel information of one UE is only carried on one CQI channel).
And 6, generating OFDM symbols and sending the uplink control information to a receiving end from different antennas.
In the periodic feedback process of R8 and R9, channel information of one wideband is fed back first, and then channel information of subbands is fed back in two intervals for feeding back wideband channel information. If only equipped withBroadband channel information is set, and the reporting entity subframe of the broadband channel information meets the following conditions:nfis the system frame number, nsIs the time slot number, NOFFSET，CQIFor subframe offset, NPIs a feedback period. If the wideband channel information and the sub-band channel information are configured at the same time, the wideband channel information and the sub-band channel information both satisfy:the period of the broadband channel information is H.NPI.e. in sub-framesAnd H is J · K +1, J being the number of bandwidth parts. Between two consecutive reports of channel information, J · K reporting entities serve to report subband channel information for K cycles, and if subband channel information has not been transmitted before the second wideband channel information is transmitted, the remaining subband channel information is not transmitted, and the cycle is sequentially increased from the channel information of the optimal subband selected in the first bandwidth part to the channel information of the optimal subband selected in the J-th bandwidth part, K being indicated by a higher layer signal.
When in COMP transmission, a UE may need to transmit channel information of multiple coordinated cells or cells in a measurement set at the same time, a higher number of feedback bits are required to be carried in uplink, and in R8 and R9, a base station (eNB) allocates only one CQI channel on a PUCCH for transmitting the channel information of a serving cell through high-layer signaling, and each CQI channel supports the channel information of 11bits at maximum. These resources are far from sufficient for COMP and there is no design and discussion of the way by which the serving cell needs to inform the UE of which cells 'channel information to feed back and the allocation of these cells' channel information on the resources. The original standard is no longer suitable for the eNB and UE of COMP, and the content of the standard needs to be necessarily extended.
Disclosure of Invention
In view of the above, the present invention provides a method and an apparatus for feeding back channel information in coordinated multipoint transmission, which are used to solve the technical problem of uploading channel information of multiple coordinated cells or cells in a measurement set in COMP transmission. In order to achieve the purpose, the technical scheme of the invention is realized as follows:
a method for feeding back channel information in coordinated multipoint transmission comprises the following steps:
in COMP transmission, channel information for all cooperating cells or all cells within a measurement set for the same UE is fed back in any of the following ways:
the method A comprises the steps of allocating a plurality of subframes for feeding back channel information of all cooperative cells or all cells in a measurement set, wherein each subframe only maps the channel information of at most one cooperative cell or one cell in the measurement set;
mode B, allocating a subframe for feeding back channel information of all cooperative cells or all cells in the measurement set;
and C, allocating a plurality of subframes for feeding back the channel information of all the cooperative cells or all the cells in the measurement set, and mapping the channel information of a plurality of cooperative cells or a plurality of cells in the measurement set in each subframe.
Further, the method further comprises: and the base station informs the UE of feeding back channel information of the cooperative cells or the cells in the measurement set through PDCCH or higher layer signaling, and mapping the channel information of the cooperative cells or the cells in the measurement set on one or more subframes. Preferably, the higher layer signaling is transmitted through a radio resource control message or a physical uplink control channel configuration field (PUCCH-Config), a physical uplink shared channel configuration field (PUSCH-Config), or a channel quality indicator report configuration field (CQI-ReportConfig) of the radio resource control message.
Further, the method further comprises: the base station adaptively adjusts a feedback mode according to different application scenes and system load conditions, and notifies the feedback mode of decision to the UE through high-level signaling, and the specific method comprises the following steps:
if the COMP coordination set is slow, or the requirement on the time delay is not strict, or the time interval in which a plurality of uplink subframes can be continuously allocated for the same UE is small, or the like, the base station selects the feedback mode a;
if the COMP coordination set has strict requirements on time delay, or a plurality of continuous uplink subframes cannot be allocated, or the time interval of the latest uplink subframes is large, and the load of uplink data information is not large, the system load is small, and the like, the base station selects a feedback mode B;
if the conditions in the two cases are not met, the base station selects the feedback mode C.
Further, when the method a is adopted, different uplink subframes are allocated for feeding back channel information of different cooperative cells or cells in a measurement set; the allocation method of the uplink subframe is any one of the following methods:
(1) allocating a plurality of continuous uplink subframes for feedback of channel information of a plurality of cooperative cells or a plurality of cells in a measurement set;
(2) several uplink subframes with the nearest time interval are allocated for the feedback of the channel information of a plurality of cooperative cells or a plurality of cells in a measurement set.
When the method B is adopted, the same (i.e. the same) uplink subframe is allocated for feeding back the channel information of all cooperating cells or all cells in the measurement set.
When the method C is adopted, a plurality of same uplink subframes are allocated to complete the feedback of the channel information of all COMP measurement set cells together, and each uplink subframe feeds back the channel information of a part of cooperative cells or a part of cells in a measurement set.
For the mode B and the mode C, based on the preferred embodiment of the present invention, in the case that channel information of a cell in a coordinated cell or a measurement set is fed back on a PUSCH, the steps before multiplexing data and control information in the generation process of the bearer content include:
step B11, calculating the bit number of the channel information of each cooperation cell or the cell in the measurement set;
step B12, respectively carrying out channel coding and rate matching for each cell;
and step B13, multiplexing the channel information of a plurality of cells after channel coding and rate matching, namely cascading the coded bit sequences of each cell according to a certain cell sequence.
For the mode B and the mode C, based on the preferred embodiment of the present invention, in the case that channel information of a cell in a coordinated cell or a measurement set is fed back on a PUSCH, the steps before multiplexing data and control information in the generation process of the bearer content include:
step B21, calculating the total channel information bit number of the cooperation cell or the cell in the measurement set;
step B22, interweaving the channel information;
step B23, segmenting the total channel information bit number of the interlaced cooperation cells or the cells in the measurement set by the feedback cell number, and then respectively carrying out channel coding and rate matching on the channel information feedback bit number calculated by each segment; after channel coding and rate matching, carrying out segmented cascade;
and step B24, interleaving the channel information again for the data bits output after the segmentation concatenation, wherein the step is an optional step.
For the mode B and the mode C, based on the preferred embodiment of the present invention, under the condition that the channel information of the cell in the cooperative cell or the measurement set is fed back on the PUCCH, in the generation process of the bearer content, the method for the UE to perform resource mapping specifically includes:
a base station informs a UE of a starting channel index of a Channel Quality Indicator (CQI) channel through a high-level signaling, and when the UE performs channel information resource mapping, the UE maps the fed-back channel information on a plurality of continuous CQI channels which are started from the position of the starting CQI channel or different CQI channels with fixed equal intervals or fixed unequal intervals; or,
the base station informs the UE of which CQI channels are adopted through high-level signaling, and the UE maps the fed-back channel information on the informed CQI channels; or,
the base station and the UE appoint a fixed CQI channel distribution pattern, and the UE maps the fed back channel information according to the fixed CQI channel distribution pattern.
Preferably, in the generation process of the bearer content, before the UE performs resource mapping, the method further includes a step of interleaving the channel information after performing channel coding on bits of the channel information of each cell.
Preferably, before performing channel coding on the channel information in the generation process of the bearer content, the method further includes the following steps: and carrying out channel information interleaving on the obtained channel information of each single cell, segmenting the interleaved channel information, and carrying out a channel coding process of the channel information after segmentation.
Based on the method described in the present invention, the present invention further provides a device for feeding back channel information in coordinated multipoint transmission, as shown in fig. 9, where the device is used in COMP transmission, and the device includes:
the decision unit is positioned at the base station and used for deciding the feedback mode of the channel information of the cooperative cell or the cells in the measurement set and determining the resource mapping information according to the decided feedback mode;
the informing unit is positioned at the base station and used for informing the decision result of the decision unit to the feedback unit through the PDCCH or the high-level signaling;
a feedback unit, located in the UE, and configured to feedback, to the base station, channel information of the executed cooperative cell or the cell in the measurement set on the specified resource by using a specified feedback manner according to the decision result of the decision unit;
the feedback mode is any one of the following modes:
the method A comprises the steps of allocating a plurality of subframes for feeding back channel information of all cooperative cells or all cells in a measurement set, wherein each subframe only maps the channel information of at most one cooperative cell or one cell in the measurement set;
mode B, allocating a subframe for feeding back channel information of all cooperative cells or all cells in the measurement set;
and C, allocating a plurality of subframes for feeding back the channel information of all the cooperative cells or all the cells in the measurement set, and mapping the channel information of a plurality of cooperative cells or a plurality of cells in the measurement set in each subframe.
Further, the decision unit adaptively decides the feedback mode according to different application scenarios and system load conditions, and the specific method is as follows:
if the COMP coordination set is slowly changed, or the requirement on the time delay is not strict, or the time interval in which a plurality of uplink subframes can be continuously allocated for the same UE or the latest plurality of uplink subframes is small, selecting the mode a;
if the COMP coordination set has strict requirements on time delay, or a plurality of continuous uplink subframes cannot be allocated, or the time interval of the latest plurality of uplink subframes is large, and the load of uplink data information is not large and the system load is small, selecting the mode B;
if neither of the above conditions is satisfied, the method C is selected.
Further, the resource mapping information includes: the decision unit feeds back channel information of which cooperative cells or which cells in the measurement set, and which cooperative cell or cells in the measurement set are mapped on which subframe.
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 cooperative cells or cells in a 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 cooperating cells or all cells in the measurement set.
Further, when the decision unit decides to use the method C, the decision unit allocates a plurality of same uplink subframes to jointly complete the feedback of the channel information of all COMP measurement set cells, and each uplink subframe feeds back the channel information of a part of the coordinated cells or a part of the cells in the measurement set.
The invention solves the problem of uploading the channel information of a plurality of cooperative cells or cells in a measurement set by expanding the LTE R8/R9 protocol.
Drawings
Fig. 1 is a feedback flow chart of channel information based on a feedback mode a according to the present invention;
fig. 2 and fig. 5 are schematic diagrams of periodic feedback of main serving cell broadband and sub-band channel information, and cell broadband channel information in a cooperative cell or a measurement set according to the present invention based on a feedback mode a;
fig. 3 and fig. 4 are schematic diagrams of periodically feeding back channel information of a primary serving cell and a cooperating cell or a cell in a measurement set according to the feedback method a of the present invention;
fig. 6 is a flow chart of generating a bearer content for feeding back channel information of a cell in a measurement set or a cooperative cell on a PUSCH based on a feedback mode B according to the present invention;
fig. 7 is a flow chart of generating a bearer content for feeding back channel information of a cell in a cooperative cell or a measurement set on a PUSCH based on a feedback mode B according to the present invention;
FIG. 8 is a flowchart illustrating a generation process of bearer content for feeding back channel information of a cooperating cell or a cell in a measurement set on a PUCCH of LTE R8/R9 based on a feedback mode B according to the present invention;
fig. 9 is a structural diagram of an apparatus for implementing channel information feedback in coordinated multipoint transmission according to the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to the accompanying drawings by way of examples.
The first embodiment is as follows:
the embodiment is directed to a feedback method a, in which a base station allocates a plurality of subframes to jointly complete feedback of channel information of all cells in a COMP measurement set, and each subframe only maps channel quality information of one cell. Based on the feedback mode a, the feedback process of the channel information is shown in fig. 1, and the specific steps are as follows:
step 101: the eNB informs the UE of which cooperative cells or cells in a measurement set are fed back by a Physical Downlink Control Channel (PDCCH) or higher layer signaling (namely, the range of the measurement set), and which cooperative cells or cells in the measurement set are fed back in which subframe, and the channel information of the cooperative cells or the cells in the measurement set is mapped on which resource or resources of the subframe;
step 102: after receiving the measurement set indication, the UE maps the fed back channel information on the specified uplink subframe according to the subframe positions and the corresponding relationship between the cells and the subframes, which are allocated by the base station and used for feeding back the channel information of all the cells in the COMP measurement set, and the resource mapping position in the subframe indicated by the base station.
If the feedback mode is the non-periodic feedback mode, the UE feeds back the channel information of the cells in the cooperative cell or the measurement set on continuous subframes or subframes with the nearest time interval after feeding back the channel information of the main serving cell.
If the mode is the periodic broadband feedback mode, after feeding back the channel information of the primary serving cell, the UE may feed back the broadband channel information of multiple cooperating cells or multiple cells in the measurement set on consecutive different subframes or several subframes with the closest time interval, where the period of the channel information of each cell may be the same or different, but the subframe offset is different.
In case of a feedback mode in which periodic wideband and sub-band are fed back together, only sub-band channel information of the primary serving cell may be fed back, in this case, after the feedback of the wideband channel information of the primary serving cell is finished, the wideband channel information of the cooperating cells or cells in the measurement set is fed back, and then the sub-band channel information of a plurality of primary serving cells is fed back, in R8 and R9, channel information of each sub-band is fed back between broadband channel information of adjacent feedback primary serving cells, at this time, the factor of the polling repeated transmission of the feedback sub-band channel information is K, and when the COMP user receives the value of K, an adjustment amount is calculated by combining the number of BPs (bandwidth parts) and the number of cooperative cells or cells in the measurement set (or one is configured by the eNB in a higher layer), and then repeatedly polling and feeding back the channel information of each service cell sub-band for K times after the feedback of the broadband channel information of each cooperative cell or the cell in the measurement set is finished. Calculations and related configurations or adjustments that may not be performed. And if the sub-band channel information of the main service cell is not transmitted completely when the broadband channel information of the main service cell arrives next time, the remaining sub-band channel information of the main service cell is not transmitted. As shown in fig. 2 and 3, but the invention is not limited thereto.
If the feedback mode is a feedback mode in which the periodic broadband and the sub-band are fed back together, the sub-band channel information of the main serving cell and the sub-band channel information of the cooperative cell or the cell in the measurement set can be fed back. In satisfyingThe sub-frame of the main service cell feeds back the broadband channel information of the main service cellThe sub-band channel information of the main service cell is fed back on the sub-frame of the sub-frame to satisfyThe broadband channel information of the first cooperative cell or the cell in the measurement set is fed back on the subframe of the measurement setThe sub-frame of (1) feeds back the sub-band channel information of the first cooperative cell or the cell in the measurement set, and so on, and meets the requirementThe broadband channel information of the Nth cooperative cell or the cell in the measurement set is fed back on the subframeThe sub-band channel information of the nth cooperative cell or the cells in the measurement set is fed back on the sub-frame of (1). Wherein N isOFFSET，CQIiSubframe offset for different cooperating cells or cells within a measurement set, NPiThe feedback periods of different cells are satisfied, i is more than or equal to 1 and less than or equal to N. N is a radical ofPiMay be the same or different, and NOFFSET，CQINCan be obtained by pairing NOFFSET，CQI1Is calculated with respect to N, i.e. with respect to NOFFSET，CQI1There is an adjustment amount for a subframe. This arrangement allows a number of possible combinations, as shown in FIG. 4And fig. 5 only shows two possible illustrations, but the invention is not limited to these two.
Example two:
the embodiment is directed to the method B, in which the base station allocates one subframe for feeding back channel information of all cooperating cells or all cells in the measurement set, and by using this method, the minimum delay can be ensured, and a faster multipoint cooperating process can be performed. This method needs to increase the feedback overhead of one uplink subframe, and needs to expand the related feedback content of the original R8 and R9. The method for expanding can be as follows:
fig. 6 shows a generation process of the bearer content for feeding back the channel information of the cell in the cooperative cell or the measurement set on the PUSCH of the present invention as follows:
601, calculating the bit number of the channel information of each cooperative cell or the cells in the measurement set;
wherein, O is the bit number of the channel information of each cooperative cell or cell in the measurement set, and Q' is the number of the channel information bits to be transmitted on the PUSCH; the total number of bearer bits is: qCQI＝QmQ', andl is the number of check bits of the CRC.In order to schedule the uplink bandwidth,for the number of symbols to be scheduled,the coding offset is modulated for the scheduled CQI. C is the number of code blocks, KrIs the length of each code block. QRINumber of modulation symbols, Q, occupied for channel Rank Indication (RI)mIs the number of constellation bits of the modulation scheme. Wherein, the bit number of the feedback may be different according to different feedback modes. The feedback mode can be divided into broadband feedback, UE-specific subband feedback, and higher-layer configured feedback.
Step 602, after calculating the feedback bit number of the channel information of each cooperative cell or the cell in the measurement set, performing channel coding and rate matching on the channel information of each cell respectively.
And when the number of feedback bits of the channel information is less than 11, adopting block coding of (32, O), otherwise adopting tail-biting convolutional coding, and then adopting the same rate matching process as the uplink control information to carry out rate matching. After the channel coding and the rate matching of the channel information of each cell are completed, the channel information of a plurality of cells is multiplexed, that is, the coded bit sequences of each cell are cascaded according to a certain cell sequence. The number of data bits output at this time is equivalent to N times the number of data bits of a single cell, where N is the number of coordinated multipoint measurement cells.
Optionally, after this step, channel information of multiple cells is interleaved, so that the order of channel information of each cell can be disturbed, and frequency diversity and time diversity gain can be fully utilized.
And step 603, multiplexing data and control information.
Step 604, channel interleaving is performed.
And step 605, scrambling.
And 606, modulating, precoding, resource mapping, generating OFDM symbols and sending the OFDM symbols to a receiving end from different antennas.
This approach modifies R8 less, but does not take full advantage of time and frequency diversity gains.
Example three:
this embodiment is directed to the method B, in the feedback method, the base station allocates one subframe to feedback the channel information of all the cooperating cells or all the cells in the measurement set, which needs to increase the feedback overhead of one uplink subframe, and needs to expand the content of the feedback of R8 and R9. The method for expanding can be as follows:
fig. 7 shows a generation process of bearer content for feeding back channel information of a cell in a coordinated cell or a measurement set on a PUSCH in this embodiment as follows:
step 701, calculating the total channel information bit number of the cooperative cells or the cells in the measurement set;
wherein O is the number of bits of the total channel information of the cooperative cell or the cells within the measurement set; q' is the number of channel information bits to be transmitted on the PUSCH; and alsoL is the number of check bits of the CRC.In order to schedule the uplink bandwidth,for the number of symbols to be scheduled,the coding offset is modulated for the scheduled channel information. C is the number of code blocks, KrIs the length of each code block. QRINumber of modulation symbols, Q, occupied by RImIs the number of constellation bits of the modulation scheme. Wherein O may be different according to different feedback modes and bit number of feedback. The feedback mode can be divided into broadband feedback, UE-specific subband feedback, and higher-layer configured feedback.
Step 702, interleaving channel information;
the channel sequence of each cell can be disturbed by interleaving the channel information, frequency diversity and time diversity are fully utilized, and interleaving can be omitted.
Step 703, segmenting the interleaved channel information, where the length of each segment is: o' ═ O/NcellWhere O is the number of bits of the total channel information of the cells in the cooperative cell or the measurement set, and NcellIs the number of cells fed back; then, respectively carrying out channel coding and rate matching on each section, adopting block coding of (32, O) when the bit number of the channel information is less than 11, or else adopting tail-biting convolutional coding, and then carrying out rate matching by adopting a rate matching process which is the same as that of the uplink control information; after channel coding and rate matching, segment concatenation is carried out, the output data bit number is equivalent to N times of the data bit number of a single cell, and N is the number of the measurement cells.
Step 704, interleaving the channel information;
the channel information of each cell can be disordered through interleaving of the channel information, frequency diversity and time diversity are fully utilized, and the step is optional and can not be interleaved.
Step 705, multiplexing data and control information.
Step 706, channel interleaving is performed.
And step 707, scrambling.
Step 708, perform modulation, precoding, resource mapping, generate OFDM symbols and send them to the receiving end from different antennas.
Example four:
in this embodiment, for the method B, which needs to expand the related feedback content of the original R8 and R9, first, the base station notifies the UE of the cooperative cell or the measurement set that needs to be fed back through a high-level signaling, and after the UE knows the measurement set, fig. 8 shows the following procedure for generating the bearer content, which is implemented on the PUCCH of LTE R8/R9, to feed back the channel information of the cooperative cell or the cell in the measurement set:
step 801, determining the number of bits required by each single-cell channel information through different feedback modes. The specific feedback modes can be divided into: broadband feedback and UE-selected subband feedback.
Step 802, performing (20, A) channel coding on the bits of the channel information of each cell, but requiring that the number of bits of the channel information of each cell is less than or equal to 11;
optionally, before this step, channel information interleaving may be performed on the obtained channel information of each single cell, then the interleaved channel information is segmented, the number of information bits of each segment after segmentation should be less than or equal to 11, and channel coding is performed after segmentation, where the purpose of performing channel information interleaving is to fully utilize frequency diversity and time diversity.
Alternatively, after step 802, the channel-coded information bits may be interleaved and then correspond to different CQI channels in the portion segmented into multiple segments with the bit number of 20.
And step 803, scrambling the coded channel information bits.
And step 804, performing constellation mapping to modulate into 10 constellation symbols, and multiplying the constellation symbols by the cyclic delay sequence to obtain a sequence after frequency domain expansion.
Step 805, performing 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 of the range of the measurement set and which CQI channels to occupy in advance through a PDCCH or a higher layer signaling. It should be noted that one uplink subframe may carry multiple CQI channels, but the multiple CQI channels are allocated to different UEs, and in the existing protocol, each UE can only occupy one CQI channel, but the present invention needs to notify, in an explicit or implicit manner, that one UE needs to occupy multiple CQI channels, and to map channel information of a cooperative cell to be fed back or a cell in a measurement set on the multiple CQI channels.
In order to have small influence on the standard, the UE may be only notified of the initial channel index of the CQI channel by using high-level signaling, and the UE places the fed-back channel information according to the number of cells in the measurement set, that is, places the fed-back channel information on a plurality of continuous CQI channels starting from the initial CQI channel position, or different CQI channels having fixed equal intervals or fixed unequal intervals, so that the high-level signaling is the same as R8; or the base station informs the UE of which CQI channels to adopt through high-level signaling, and the UE maps the feedback channel information on the informed CQI channels; or the base station and the UE appoint a fixed CQI channel distribution pattern, the UE maps the fed back channel information according to the fixed CQI channel distribution pattern, the base station and the UE can also appoint a plurality of fixed CQI channel distribution patterns, and the base station informs the UE of selecting different CQI channel distribution patterns through a plurality of bits.
Step 806, OFDM symbol generation and sending uplink control information from different antennas to the receiving end.
Example five:
the embodiment is directed to a mode B, which needs to expand related feedback contents of original R8 and R9, first, a base station notifies a UE of a cooperative cell or a measurement set to be fed back through a high-level signaling, and after the UE knows the measurement set, a generation process of bearer contents for feeding back channel information of the cooperative cell or a cell in the measurement set on a PUCCH of LTE R8/R9 is as follows:
step 901, determining the number of bits required by each single-cell channel information through different feedback modes. The specific feedback modes can be divided into: broadband feedback and UE-selected subband feedback.
Step 902, channel coding (20, a) is performed on the bits of the channel information of each cell, but the number of bits of the channel information of each cell is required to be 11 or less.
Optionally, before this step, channel information interleaving may be performed on the obtained channel information of each single cell, then the interleaved channel information is segmented, the number of information bits of each segment after segmentation should be less than or equal to 11, and channel coding is performed after segmentation, where the purpose of performing channel information interleaving is to fully utilize frequency diversity and time diversity.
Alternatively, after step 802, the channel-coded information bits may be interleaved and then correspond to different CQI channels in the portion segmented into multiple segments with the bit number of 20.
And step 903, scrambling or not scrambling the coded channel information bits, and then interleaving (the interleaving may adopt matrix interleaving or random interleaving, etc.) to allocate the channel information of different cells to different CQI channels, so as to obtain better frequency diversity gain.
And 904, carrying out constellation mapping to modulate into 10 constellation symbols, and multiplying the constellation symbols by the cyclic delay sequence to obtain a sequence after frequency domain expansion.
Step 905, performing power adjustment and resource mapping, where the resource mapping is to be mapped to multiple CQI channels, that is, the base station needs to inform the UE of which CQI channels to occupy in advance through a higher layer signaling. In order to have a small impact on the criteria, high layer signaling may be used to inform only the UE of the starting channel index of the CQI channel, and the UE sequentially places channel information to the different CQI channels by measuring the number of cells in the set. The eNB also reserves a plurality of CQI channels for this UE in sequence, and this implicit notification method is performed by the starting channel index of the CQI channel and the number of cells in the measurement set. The UE places the channel information on a number of consecutive or fixedly equally spaced or fixedly unequally spaced different CQI channels starting from the starting CQI channel position by measuring the number of cells in the set. Thus the higher layer signaling is the same as R8. The eNB may also use high layer signaling to inform the UE of different CQI channels, which may be discontinuous, or may use a fixed CQI channel allocation pattern for the eNB and the UE or select different CQI channel allocation patterns by several bit notifications.
Step 906, OFDM symbol generation and sending uplink control information from different antennas to the receiving end.
Example six:
in a manner C corresponding to this embodiment, channel information of a part of cooperating cells or a part of cells in a measurement set for the same UE is fed back in the same uplink subframe, and a plurality of uplink subframes are used to complete channel information feedback for all COMP measurement set cells together. The specific method can be as follows:
the eNB may inform the UE of which subframes the channel information of which cells is to be fed back on, that is, the eNB informs the UE of which subframes the channel information of which cells is to be transmitted on through higher layer signaling. For example, the eNB instructs the UE to feed back channel information with cell indexes 1-3 on the first uplink subframe and channel information with cell indexes 4-6 on the second uplink subframe. Or a default feedback method for eNB and UE, such as feeding back channel information of several cells of consecutive indexes in one subframe. Feedback can also be performed according to the multiplexing factor of the channel state information pilot (CSI-RS), for example, there are 6 measurement cells, the multiplexing factor of the CSI-RS is 3, that only needs to feed back channel information of 3 coordinated cells or cells in the measurement set per subframe, and feed back channel information of the last 3 coordinated cells or cells in the measurement set in the next feedback subframe. In this case, the feedback modes of R8 and R9 also need to be expanded, and the expansion method can refer to the expansion method given in the implementation of two, three, four and five.
Example seven:
in this embodiment, the base station adaptively adjusts the feedback scheme according to different application scenarios and system load conditions, and notifies the UE of the decision-making feedback manner through a high-level signaling, and the UE feeds back channel information of the cooperative cell or the cell in the measurement set to the base station in the base station decision-making feedback manner. The method for adaptively adjusting the feedback scheme by the base station may be:
(1) if the base station determines that the COMP coordination set is slow-changing, or the requirement on the time delay is not strict, or a plurality of uplink subframes can be continuously allocated, or the time interval of the plurality of uplink subframes is small, the feedback mode a is selected, that is, the channel information of all coordination cells or all cells in the measurement set is fed back by using the plurality of subframes, but at most the channel information of one coordination cell or one cell in the measurement set is fed back by each subframe.
(2) If the base station determines that the COMP coordination set has strict requirements on time delay, or cannot allocate a plurality of continuous uplink subframes, or the time interval of a plurality of uplink subframes is large, and the load of uplink data information is not large, and the system load is small, the base station selects the feedback mode B, that is, feeds back channel information of all coordination cells or all cells in the measurement set in one subframe.
(3) If the base station judges that the requirement is not met, the feedback mode C is selected, namely a plurality of subframes are used for feeding back the channel information of all the cooperative cells or all the cells in the measurement set, but the channel information of part of the cooperative cells or part of the cells in the measurement set is fed back in one subframe
The eNB decides which feedback mode of the specific usage modes A, B, C to use by the requirements of uplink data load, system load and system for delay, and informs the UE through higher layer signaling.
The higher layer signaling referred in the above embodiments may be selected from the radio resource control message, and further may be selected from the PUCCH-Config field, the PUSCH-Config field, or the CQI-ReportConfig field in the radio resource control message for transmission.
Example eight:
fig. 9 is a schematic structural diagram of a feedback apparatus for channel information in coordinated multipoint transmission, where the apparatus is used in COMP transmission, and includes: the device comprises a decision unit, a notification unit and a feedback unit.
The decision unit is positioned at the base station and used for deciding the feedback mode of the channel information of the cooperative cell or the cells in the measurement set and determining the resource mapping information according to the decided feedback mode;
the feedback mode is any one of the following modes:
the method A comprises the steps of allocating a plurality of subframes for feeding back channel information of all cooperative cells or all cells in a measurement set, wherein each subframe only maps the channel information of at most one cooperative cell or one cell in the measurement set;
mode B, allocating a subframe for feeding back channel information of all cooperative cells or all cells in the measurement set;
and C, allocating a plurality of subframes for feeding back the channel information of all the cooperative cells or all the cells in the measurement set, and mapping the channel information of a plurality of cooperative cells or a plurality of cells in the measurement set in each subframe.
The resource mapping information includes: the decision unit feeds back channel information of which cooperative cells or which cells in the measurement set, and which cooperative cell or cells in the measurement set are mapped on which subframe.
The decision unit adaptively decides the used feedback mode according to different application scenes and system load conditions, and the specific method comprises the following steps: if the COMP coordination set is slowly changed, or the requirement on the time delay is not strict, or the time interval in which a plurality of uplink subframes can be continuously allocated for the same UE or the latest plurality of uplink subframes is small, selecting the mode a; if the COMP coordination set has strict requirements on time delay, or a plurality of continuous uplink subframes cannot be allocated, or the time interval of the latest plurality of uplink subframes is large, and the load of uplink data information is not large and the system load is small, selecting the mode B; if neither of the above conditions is satisfied, the method C is selected.
The informing unit is positioned at the base station and is used for informing the decision result of the decision unit to the feedback unit through a PDCCH or a high-level signaling;
the feedback unit is located in the UE and used for feeding back channel information of the executed cooperative cell or the cells in the measurement set to the base station on the specified resource by using a specified feedback mode according to the decision result of the decision unit;
when the decision unit decides to use the mode a, the decision unit allocates different uplink subframes for feeding back channel information of cells in different cooperative cells or measurement sets. 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 cooperating cells or all cells in the measurement set. When the decision unit decides to use the mode C, the decision unit allocates a plurality of same uplink subframes to complete the feedback of the channel information of all COMP measurement set cells together, and each uplink subframe feeds back the channel information of part of the coordinated cells or part of the cells in the measurement set.
When the feedback unit feeds back channel information of a cell in a cooperative cell or a measurement set on a PUSCH and a PUCCH, a generation process of the bearer content is the same as in embodiments two to five, which is not described herein again.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention. Any method related to the multipoint collaborative feedback method used herein shall be included within the scope of the present invention.

Claims (13)

1. A method for feeding back channel information in coordinated multipoint transmission is characterized by comprising the following steps:
in coordinated multipoint transmission (COMP), channel information for all cooperating cells or all cells within a measurement set of the same UE is fed back in any of the following ways:
the method A comprises the steps of allocating a plurality of subframes for feeding back channel information of all cooperative cells or all cells in a measurement set, wherein each subframe only maps the channel information of at most one cooperative cell or one cell in the measurement set;
mode B, allocating a subframe for feeding back channel information of all cooperative cells or all cells in the measurement set;
the method C is to allocate a plurality of subframes for feeding back the channel information of all the cooperative cells or all the cells in the measurement set, but to map the channel information of a plurality of cooperative cells or a plurality of cells in the measurement set in each subframe;
if the COMP coordination set is slowly changed, or the requirement on time delay is not strict, or the time interval in which a plurality of uplink subframes can be continuously allocated for the same UE or the latest uplink subframes is small, selecting a feedback mode a;
if the COMP coordination set has strict requirements on time delay, or a plurality of continuous uplink subframes cannot be allocated, or the time interval of the latest uplink subframes is large, and the load of uplink data information is not large and the system load is small, selecting a feedback mode B;
if neither of the above conditions is satisfied, the feedback method C is selected.
2. The method of claim 1, further comprising:
the base station informs the UE of feeding back channel information of the cooperative cell or the cells in the measurement set through a Physical Downlink Control Channel (PDCCH) or high-layer signaling, and maps the channel information of the cooperative cell or the cells in the measurement set on one or more subframes.
3. The method of claim 2, wherein when the method a is adopted, different uplink subframes are allocated for feeding back channel information of different cooperative cells or cells in a measurement set; the allocation method of the uplink subframe is any one of the following methods:
(1) allocating a plurality of continuous uplink subframes for feedback of channel information of a plurality of cooperative cells or a plurality of cells in a measurement set;
(2) several uplink subframes with the nearest time interval are allocated for the feedback of the channel information of a plurality of cooperative cells or a plurality of cells in a measurement set.
4. The method according to claim 2, wherein in the case of feeding back channel information of cells in a coordinated cell or a measurement set on a Physical Uplink Shared Channel (PUSCH), the step before multiplexing of data and control information in the generation process of the bearer content includes:
b11, calculating the bit number of the channel information of each cooperative cell or the cells in the measurement set;
b12, performing channel coding and rate matching respectively for each cell;
b13, after channel coding and rate matching, multiplexing the channel information of multiple cells, that is, concatenating the coded bit sequences of each cell according to a certain cell order.
5. The method according to claim 2, wherein in the case of feeding back cell channel information in a coordinated cell or a measurement set on a PUSCH, the step before multiplexing of data and control information in the generation of the bearer content includes:
b21, calculating the total channel information bit number of the cooperative cells or the cells in the measurement set;
b22, interleaving the channel information;
b23, segmenting the total channel information bit number of the interlaced cooperation cells or the cells in the measurement set by the feedback cell number, and then respectively carrying out channel coding and rate matching on the channel information feedback bit number calculated by each segment; after channel coding and rate matching, concatenation of segments is performed.
6. The method of claim 5, further comprising, after step B23, the steps of: and interleaving the channel information again on the data bits output after the segmentation and concatenation.
7. The method according to claim 2, wherein, when feeding back channel information of a cell in a coordinated cell or a measurement set on a Physical Uplink Control Channel (PUCCH), in a bearer content generation process, the method for the UE to perform resource mapping specifically includes:
a base station informs a UE of a starting channel index of a Channel Quality Indicator (CQI) channel through a high-level signaling, and when the UE performs channel information resource mapping, the UE maps feedback channel information on a plurality of continuous or fixed equally-spaced CQI channels from the position of the starting CQI channel; or,
the base station informs the UE of which CQI channels are adopted through high-level signaling, and the UE maps the fed-back channel information on the informed CQI channels; or,
the base station and the UE appoint a fixed CQI channel distribution pattern, and the UE maps the fed back channel information according to the fixed CQI channel distribution pattern.
8. The method of claim 7, wherein before channel coding the channel information in the generation of the bearer content, further comprising:
and carrying out channel information interleaving on the obtained channel information of each single cell, segmenting the interleaved channel information, and carrying out a channel coding process of the channel information after segmentation.
9. The method of claim 7, wherein in the generation of the bearer content, before the UE performs resource mapping, after performing channel coding on bits of the channel information of each cell, the method further comprises a step of interleaving the channel information.
10. The method of claim 2, wherein the higher layer signaling is transmitted via a radio resource control message or a physical uplink control channel configuration field (PUCCH-Config), a physical uplink shared channel configuration field (PUSCH-Config), or a channel quality indicator report configuration field (CQI-ReportConfig) of a radio resource control message.
11. An apparatus for feeding back channel information in coordinated multipoint transmission, the apparatus being used in COMP transmission, the apparatus comprising:
the decision unit is positioned at the base station and used for deciding the feedback mode of the channel information of the cooperative cell or the cells in the measurement set and determining the resource mapping information according to the decided feedback mode;
the informing unit is positioned at the base station and used for informing the decision result of the decision unit to the feedback unit through the PDCCH or the high-level signaling;
a feedback unit, located in the UE, and configured to feedback, to the base station, channel information of the executed cooperative cell or the cell in the measurement set on the specified resource by using a specified feedback manner according to the decision result of the decision unit;
the feedback mode is any one of the following modes:
the method A comprises the steps of allocating a plurality of subframes for feeding back channel information of all cooperative cells or all cells in a measurement set, wherein each subframe only maps the channel information of at most one cooperative cell or one cell in the measurement set;
mode B, allocating a subframe for feeding back channel information of all cooperative cells or all cells in the measurement set;
the method C is to allocate a plurality of subframes for feeding back the channel information of all the cooperative cells or all the cells in the measurement set, but to map the channel information of a plurality of cooperative cells or a plurality of cells in the measurement set in each subframe; wherein,
the decision unit is specifically configured to select the mode a when the COMP coordination set is slow-changing, or the requirement on the delay is not strict, or a time interval in which a plurality of uplink subframes can be continuously allocated to the same UE or a plurality of uplink subframes are closest to the same UE is small;
the COMP cooperation set has strict requirements on time delay, or a plurality of continuous uplink subframes cannot be allocated, or the time interval of a plurality of recent uplink subframes is large, the load of uplink data information is not large, the system load is small, and the mode B is selected;
in both cases, the condition is not satisfied, and the method C is selected.
12. The apparatus of claim 11, wherein the resource mapping information comprises: the decision unit feeds back channel information of which cooperative cells or which cells in the measurement set, and which cooperative cell or cells in the measurement set are mapped on which subframe.
13. The apparatus according to claim 11, wherein when the decision unit decides to use the mode a, the decision unit allocates different uplink subframes for feeding back channel information of different cooperating cells or cells in a measurement set.
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