WO2011085516A1 - 多小区mimo信道信息反馈设备和方法 - Google Patents
多小区mimo信道信息反馈设备和方法 Download PDFInfo
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- WO2011085516A1 WO2011085516A1 PCT/CN2010/000057 CN2010000057W WO2011085516A1 WO 2011085516 A1 WO2011085516 A1 WO 2011085516A1 CN 2010000057 W CN2010000057 W CN 2010000057W WO 2011085516 A1 WO2011085516 A1 WO 2011085516A1
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- Prior art keywords
- feedback
- channel
- information feedback
- mobile terminal
- cell
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- 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
- 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
- H04B7/0632—Channel quality parameters, e.g. channel quality indicator [CQI]
-
- 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
- H04B7/0413—MIMO systems
- H04B7/0456—Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting
-
- 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
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L25/00—Baseband systems
- H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
- H04L25/03—Shaping networks in transmitter or receiver, e.g. adaptive shaping networks
- H04L25/03891—Spatial equalizers
- H04L25/03898—Spatial equalizers codebook-based design
- H04L25/03904—Spatial equalizers codebook-based design cooperative design, e.g. exchanging of codebook information between base stations
-
- 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
- H04B7/0636—Feedback format
- H04B7/0639—Using selective indices, e.g. of a codebook, e.g. pre-distortion matrix index [PMI] or for beam selection
Definitions
- Multi-cell MIMO channel information feedback device and method Multi-cell MIMO channel information feedback device and method
- the present invention relates to the field of wireless communications, and in particular, to a multi-cell MIM0 channel information feedback device and method. Background technique
- PMI feedback is more efficient in single base station (BS) transmission mode.
- BS base station
- PMI feedback may greatly limit the precoding freedom of multiple cells involved.
- Physical channel matrix feedback can lead to excessive feedback overhead.
- the feedback scheme described by NTT DoCoMo in Proposal R1-094244 of the 3GPP RAN WG1 #58bis conference whether based on channel vector quantization (example 1) or based on channel element quantization (example 2), can lead to excessive
- the feedback overhead e.g., up to 26.6 bits/subband/cell in Example 1 and up to 53.3 bits/subband/cell in Example 2 is unacceptable in practical systems. Summary of the invention
- the present invention proposes a channel state information (CSI) / channel quality information (CQI) feedback scheme for supporting downlink coordinated multi-point (DL CoMP).
- CSI channel state information
- CQI channel quality information
- the present invention provides a CSI feedback scheme for supporting DL CoMP and a related CQI feedback scheme, which are jointly formed to support CoMP.
- Complete channel information feedback scheme is proposed.
- CSI feedback includes channel-vector quantization (CVQ) based per-cell channel direction information (CDI) feedback and scalar-quantized inter-cell relative phase and/or amplitude feedback.
- CVQ channel-vector quantization
- CDI per-cell channel direction information
- the accuracy of the CDI feedback can be improved by transforming the codebook used to perform CVQ through the channel covariance matrix.
- the CQI feedback corresponds only to the serving cell and represents the ratio of the received signal power from the serving cell to the noise plus interference power from the cells outside the coordinated cell set.
- the CQI feedback indicates a specific power ratio value
- the base station can derive a final expected post-detection signal to interference plus noise ratio (SINR) value by CQI feedback and inter-cell relative amplitude feedback according to the applied transmission mode.
- SINR signal to interference plus noise ratio
- An aspect of the present invention provides a mobile terminal, including: a channel state information feedback calculation unit, configured to calculate channel state information feedback between the mobile terminal and its serving cell and all coordinated cells; and a channel quality information feedback calculation unit, Means for calculating channel quality information feedback corresponding to the serving cell of the mobile terminal; and a transmitting unit, configured to transmit the channel state information feedback and the channel quality information feedback to the serving cell.
- a channel state information feedback calculation unit configured to calculate channel state information feedback between the mobile terminal and its serving cell and all coordinated cells
- a channel quality information feedback calculation unit Means for calculating channel quality information feedback corresponding to the serving cell of the mobile terminal
- a transmitting unit configured to transmit the channel state information feedback and the channel quality information feedback to the serving cell.
- the channel state information feedback includes per-cell channel direction information feedback based on channel vector quantization and inter-cell relative phase and/or amplitude feedback based on scalar quantization
- the channel state information feedback calculation unit includes: channel direction information a feedback calculation unit, configured to calculate channel-direction information feedback per cell based on channel vector quantization; and a relative amplitude/phase feedback calculation unit configured to calculate inter-cell relative phase and/or amplitude feedback based on scalar quantization.
- the relative amplitude/phase feedback calculation unit comprises at least one of: a relative amplitude feedback calculation subunit for calculating inter-cell relative amplitude feedback based on scalar quantization; and a relative phase feedback calculation subunit for calculating a scalar based Quantized relative phase feedback between cells.
- the channel direction information feedback calculation unit transforms a codebook for performing channel vector quantization by a channel covariance matrix.
- a base station including: a transmission unit, configured to move The mobile terminal receives channel state information feedback between the mobile terminal and its serving cell and all coordinated cells and channel quality information feedback corresponding to the serving cell of the mobile terminal; the signal and interference plus noise ratio calculating unit receives based on the transmitting unit Channel state information feedback and channel quality information feedback, calculating a desired post-detection signal to interference plus noise ratio according to the applied transmission mode; user scheduling and transmission format determining unit, performing based on the detected signal and interference plus noise ratio Determination of user scheduling and transmission format; multi-point cooperative precoder computing unit, calculating multi-point cooperative precoding matrix according to channel state information feedback between the scheduled mobile terminal and the serving cell and all coordinated cells; and multi-point coordination
- the precoding and transmitting unit performs corresponding precoding processing on the user data according to the multipoint cooperative precoding matrix calculated by the multipoint cooperative precoder computing unit.
- the determining of the transmission format comprises a determination of a modulation and coding scheme.
- the calculations performed by the multipoint cooperative precoder computing unit are implemented in accordance with a zero forcing algorithm or a block diagonalization algorithm.
- a still further aspect of the present invention provides a channel information feedback method, including: calculating channel state information feedback between a mobile terminal and its serving cell and all coordinated cells; and calculating channel quality information feedback corresponding to the serving cell of the mobile terminal And transmitting the channel state information feedback and the channel quality information feedback to the serving cell.
- the channel state information feedback includes per-cell channel direction information feedback based on channel vector quantization and inter-cell relative phase and/or amplitude feedback based on scalar quantization.
- the codebook for performing channel vector quantization is transformed by a channel covariance matrix to improve the accuracy of codebook based vector quantization.
- a further aspect of the invention provides a communication system comprising the mobile terminal and base station described above.
- CDI feedback per cell based on vector quantization and relative phase and amplitude feedback between cells based on scalar quantization greatly reduces feedback overhead.
- the present invention is an upgradeable feedback scheme that can be flexibly applied to a variety of multi-point coordinated transmission scenarios.
- FIG. 1 is a block diagram showing a mobile terminal according to an embodiment of the present invention
- FIG. 2 is a block diagram showing a base station according to an embodiment of the present invention
- FIG. 3 is a flow chart showing a channel information feedback method performed by a mobile terminal according to an embodiment of the present invention
- FIG. 4 is a diagram showing an exemplary communication system including a mobile terminal and a base station in accordance with the present invention.
- FIG. 1 is a block diagram showing a mobile terminal in accordance with one embodiment of the present invention.
- the mobile terminal 1 includes a CSI feedback calculation unit 10, a CQI feedback calculation unit 11, and a transmission unit 12.
- the CSI feedback calculation unit 10 includes a CDI feedback calculation unit 110 and a relative amplitude/phase feedback calculation unit 120, and the relative amplitude/phase feedback calculation unit 120 further includes a relative amplitude feedback calculation subunit 120-1 and a relative phase feedback calculation subunit. 120-2.
- the CSI feedback calculation unit 10 and the CQI feedback calculation unit 11 respectively calculate CSI feedback and CQI feedback, and deliver the calculated CSI feedback and CQI feedback to the transmission unit 12, thereby finally transmitting it to the service through the transmission unit 12. Community.
- each component in the mobile terminal 1 will be described in detail.
- the CSI feedback calculation unit 10 includes a CDI feedback calculation unit 110 and a relative amplitude/phase feedback calculation unit 120 for calculating CDI feedback and basis for each cell based on vector quantization, respectively.
- the channel between the cell ie S and the user is represented as H, . e C , where S represents a coordinated cell index set whose size is
- ie, the number of cells in the coordinated cell set
- C NxM represents NxM
- M and N represent the number of antennas of the base station and the number of user antennas, respectively.
- the index number of the serving cell of the user is k, and all the cooperating cells have the same number of transmitting antennas.
- the per-cell CDI feedback is based on vector quantization according to the codebook.
- the number of bits required is expressed as l 0 g , where L is the number of codewords within the codebook.
- C Mxl represents the complex signal space of Mxl.
- the matrix ⁇ is a diagonal matrix with descending singular values. In general, it is assumed that the number of data streams per user is one. In this case, the receiving combination vector is
- the accuracy of the codebook can be transformed by using a cell-specific covariance matrix, which is expressed as follows:
- the CDI feedback per cell only includes pure direction information of the equivalent cell, lacking amplitude and/or phase information.
- amplitude and / Or phase information is indispensable. Therefore, a specific operation of calculating the feedback amplitude and/or phase information by the relative amplitude/phase feedback calculation unit 120 will be described next.
- the present invention in order to save feedback overhead, only non-serving coordinated cells, etc. are calculated.
- the phase and amplitude of the effect channel are relative to the relative values of the phase and amplitude of the equivalent channel of the serving cell.
- the relative amplitude feedback calculation sub-unit 120-1 calculates the equivalent channel ⁇ relative to the serving cell
- Relative phase information of the I B channel specifically:
- the relative phase feedback calculation sub-unit 120-2 calculates the relative amplitude information of the equivalent channel ⁇ relative to the serving cell. specifically:
- a bit representing the relationship between ⁇ (for example, 0 means Ai ⁇ A k , 1 indicates other cases) should be fed back together with the index of ⁇ , so that the base station can clearly reconstruct different equivalent channel amplitudes. Relationship between. Assuming that the relative amplitude is evenly distributed within the range (0, 1), the scalar quantized codebook can be designed as
- the relative amplitude/phase feedback calculation unit 120 reverses the calculated relative amplitude
- the feed and relative phase feedback is provided to the transmission unit 12 for feedback back to the serving cell (i.e., the assumed cell k) by the transmission unit 12.
- CQI feedback is required to implement channel-dependent user scheduling and transmission format determination (e.g., modulation and coding schemes). Therefore, an effective CQI feedback scheme is very important for system operation.
- CQI feedback is only a direct indication of the recommended modulation and coding scheme.
- this CQI feedback is referred to as implicit CQI feedback.
- Implicit CQI feedback is an effective solution in single cell operation, especially in single-user MIMO (SU-MIMO).
- SU-MIMO single-user MIMO
- implicit CQI feedback is difficult or almost impossible to feed back to the recommended modulation and coding scheme itself. Conversely, in this case, it is more convenient to feed back a specific value from which the base station can calculate the final channel quality of each involved user.
- this method is called explicit CQI feedback.
- the CQI feedback calculation unit 11 is an explicit CQI feedback calculation unit for multi-cell MIM0 transmission.
- the CQI feedback calculation unit 11 is combined with the CSI feedback calculation unit 10 described above such that inter-cell relative amplitude feedback is shared between CSI feedback and CQI feedback. Therefore, the mobile terminal only needs to feed back the CQI related to the serving cell, as shown below.
- CQI feedback can be based on scalar quantization, as follows
- r [y, ⁇ 2 ... ; ⁇ ] represents the CQI scalar quantized codebook, representing the distortion metric.
- the CQI feedback calculation unit 11 supplies the calculated CQI feedback to the transmission unit 12, thereby being fed back to the serving cell (i.e., the assumed cell k) through the transmission unit 12.
- the base station 2 shows a block diagram of a base station in accordance with one embodiment of the present invention.
- the base station 2 includes a transmission unit 22, an SINR calculation unit 20, a user scheduling and transmission format determining unit 21, a multipoint cooperative precoder computing unit 23, and a multipoint coordinated precoding and transmitting unit 24.
- the SINR calculating unit 20 in the base station first derives the cooperation with the non-service according to the CQI feedback of the serving cell and the relative amplitude feedback between the cells. 57
- the SINR calculating unit 20 is capable of calculating a desired post-detection dry-to-sense ratio (SINR) 0 based on the applied transmission mode based on the calculated post-detected SINR,
- SINR dry-to-sense ratio
- the user scheduling and transmission format determining unit 21 performs determination of user scheduling and transmission format (e.g., determination of modulation and coding scheme).
- the multipoint coordinated precoder calculation unit 23 calculates a multipoint cooperative precoding matrix based on the channel state information feedback between the scheduled user and the serving cell and all the coordinated cells.
- different downlink multi-point coordinated transmission modes require different channel state information feedback.
- the multi-point coordinated scheduling/beamforming transmission mode only needs to be based on the codebook per cell.
- the joint transmission method based on multi-cell global precoding, the channel direction feedback information of each cell based on the codebook and the relative phase and amplitude information between cells are required.
- the calculation of the multi-point cooperative precoder can be implemented according to the Zero-Forcing algorithm or the Block-Diagonization algorithm.
- the multipoint coordinated precoding and transmitting unit 24 performs corresponding precoding processing on the user data according to the multipoint cooperative precoding matrix calculated by the multipoint cooperative precoder calculating unit 23, and then performs transmission.
- FIG. 3 shows a flow chart of a channel information feedback method performed by a mobile terminal in accordance with one embodiment of the present invention.
- the method begins in step S30.
- step S32 per-cell channel direction information (CDI) feedback based on channel vector quantization (CVQ) is calculated.
- step S34 inter-cell relative amplitude and/or phase feedback based on scalar quantization is calculated.
- step S36 CQI feedback corresponding to the serving cell is calculated.
- the calculated channel information is fed back to the serving cell. Then, the method ends at step S40.
- CDI per-cell channel direction information
- CVQ channel vector quantization
- FIG. 4 illustrates an example communication system including a mobile terminal and a base station in accordance with the present invention.
- the communication system comprises mobile terminals MS1 and MS2 and a base station 1 and a base station 2.
- the mobile terminals MS1 and MS2 may be the mobile terminal according to the present invention shown in FIG. 1, and the base station 1 and the base Station 2 may be a base station according to the invention shown in Fig. 2.
- the mobile terminals MS1 and MS2 respectively transmit their downlink coordinated multi-point CSI and CQI feedback to the serving cell, and the base station 1 and the base station 2 calculate the detected SINR based on the feedback information, and perform based on the SINR.
- User scheduling and transport format determination may be the mobile terminal according to the present invention shown in FIG. 1, and the base station 1 and the base Station 2 may be a base station according to the invention shown in Fig. 2.
- the mobile terminals MS1 and MS2 respectively transmit their downlink coordinated multi-point CSI and CQI feedback to the serving cell, and the base station 1
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Priority Applications (7)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2012548321A JP5497918B2 (ja) | 2010-01-13 | 2010-01-13 | マルチ・セルmimoのためのチャネル情報フィードバックのデバイスおよび方法 |
CN201080034766.1A CN102474312B (zh) | 2010-01-13 | 2010-01-13 | 多小区mimo信道信息反馈设备和方法 |
EP10842800.4A EP2525504A4 (en) | 2010-01-13 | 2010-01-13 | METHOD AND EQUIPMENT FOR MIMO CHANNEL INFORMATION FEEDBACK IN MULTIPLE CELLS |
PCT/CN2010/000057 WO2011085516A1 (zh) | 2010-01-13 | 2010-01-13 | 多小区mimo信道信息反馈设备和方法 |
KR1020127020797A KR101411342B1 (ko) | 2010-01-13 | 2010-01-13 | 다중 셀들에서의 다중―입력 다중―출력(mimo) 채널들 정보 피드백에 대한 방법 및 장비 |
BR112012017302A BR112012017302A2 (pt) | 2010-01-13 | 2010-01-13 | dispositivo e método de retroalimentação de informações de canal para mimo multicelular |
US13/521,901 US9083411B2 (en) | 2010-01-13 | 2010-01-13 | Device and method of channel information feedback for multi-cell MIMO |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
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PCT/CN2010/000057 WO2011085516A1 (zh) | 2010-01-13 | 2010-01-13 | 多小区mimo信道信息反馈设备和方法 |
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WO2011085516A1 true WO2011085516A1 (zh) | 2011-07-21 |
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PCT/CN2010/000057 WO2011085516A1 (zh) | 2010-01-13 | 2010-01-13 | 多小区mimo信道信息反馈设备和方法 |
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US (1) | US9083411B2 (zh) |
EP (1) | EP2525504A4 (zh) |
JP (1) | JP5497918B2 (zh) |
KR (1) | KR101411342B1 (zh) |
CN (1) | CN102474312B (zh) |
BR (1) | BR112012017302A2 (zh) |
WO (1) | WO2011085516A1 (zh) |
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JP2011234368A (ja) * | 2010-04-29 | 2011-11-17 | Ntt Docomo Inc | ユーザ設備、基地局及びチャネル情報フィードバック方法 |
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Also Published As
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US20120289275A1 (en) | 2012-11-15 |
EP2525504A1 (en) | 2012-11-21 |
KR20120113778A (ko) | 2012-10-15 |
CN102474312A (zh) | 2012-05-23 |
EP2525504A4 (en) | 2015-07-22 |
CN102474312B (zh) | 2014-06-04 |
KR101411342B1 (ko) | 2014-06-25 |
US9083411B2 (en) | 2015-07-14 |
BR112012017302A2 (pt) | 2016-04-19 |
JP5497918B2 (ja) | 2014-05-21 |
JP2013517648A (ja) | 2013-05-16 |
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