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WO2017076347A1 - 一种信道状态信息量化反馈方法及终端 - Google Patents

一种信道状态信息量化反馈方法及终端 Download PDF

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Publication number
WO2017076347A1
WO2017076347A1 PCT/CN2016/104645 CN2016104645W WO2017076347A1 WO 2017076347 A1 WO2017076347 A1 WO 2017076347A1 CN 2016104645 W CN2016104645 W CN 2016104645W WO 2017076347 A1 WO2017076347 A1 WO 2017076347A1
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Prior art keywords
csi
feedback
configuration information
cqi
pmi
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English (en)
French (fr)
Inventor
陈艺戬
李儒岳
徐俊
王瑜新
鲁照华
吴昊
肖华华
蔡剑兴
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ZTE Corp
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ZTE Corp
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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
    • H04B7/0413—MIMO systems
    • H04B7/0456—Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting
    • 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
    • H04B7/0478—Special codebook structures directed to feedback optimisation
    • H04B7/0481—Special codebook structures directed to feedback optimisation using subset selection of codebooks
    • 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
    • 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]

Definitions

  • the present invention relates to the field of wireless communications, and in particular, to a channel information quantization feedback method and terminal in a multi-antenna system.
  • a transmitting end and a receiving end use a plurality of antennas to obtain a higher rate in a spatial multiplexing manner.
  • an enhanced technology is that the receiving end feeds back the channel information of the transmitting end, and the transmitting end uses the transmitting precoding technology according to the obtained channel information, which can greatly improve the transmission performance.
  • SU-MIMO single-user multiple-input multiple-output
  • MIMO Multi-input Multi-output, multiple-input multiple-output
  • channel feature vector information is used for precoding directly; for multi-user MIMO (MU-MIMO) , need more accurate channel information.
  • CSI channel state information, including channel part and interference part
  • the FDD system currently has the following typical CSI feedback scenarios and corresponding feedback technologies
  • CSI feedback scenario 1 The CSI feedback when the base station cannot obtain the state channel information through reciprocity.
  • the content of the CSI mainly includes (RI/PMI/CQI): Channel Quality Indication (CQI), Precoding Matrix Indicator (PMI), and Rank Indicator (Rank).
  • CQI is an indicator to measure the quality of downlink channels.
  • CQI can be understood as a kind of quantization of signal to interference and noise ratio SINR.
  • SINR Signal to interference and noise ratio
  • CQI is represented by integer values of 0-15, which respectively represent different CQI levels, and different CQIs correspond to their respective modulation modes and coding codes.
  • Rate (MCS) RI is used to describe empty The number of independent channels, corresponding to the rank of the channel response matrix.
  • the UE In the spatial multiplexing mode, the UE needs to feed back the RI information, and the other modes do not need to feed back the RI information.
  • the rank of the channel matrix corresponds to the number of layers.
  • the PMI feeds back the best precoding information, based on the index feedback, indicating the codeword of the agreed codebook that best matches the characteristics of the current channel.
  • the base station transmits N sets of pilots to the terminal for channel state information measurement, N ⁇ 2.
  • the terminal selects one set of pilots, and reports a CRI (CSI-RS Resource Index) to the base station, and the terminal reports the RI/PMI/CQI based on the selected channel measurement pilot;
  • the best CSI-RS resource is measured (which can be understood as part of the channel information feedback).
  • the base station can obtain the total channel information through CRI and traditional CSI feedback, as shown in Figure 2.
  • a typical application of this technology is vertical sector virtualization technology.
  • the base station uses different precoding to generate beams in different directions to cover different vertical directions.
  • the UE selects the best precoding pilot (vertical beam), and then based on the The precoded pilot performs horizontal dimension CSI feedback.
  • the base station obtains relatively complete channel state information based on the reporting of the precoding pilot (vertical beam) selection information of the terminal and the CSI feedback of the horizontal dimension, combined with the weight used by the precoding pilot.
  • CSI feedback scenario 2 CSI feedback when the base station can obtain channel part information through FDD reciprocity/
  • the uplink channel can be estimated by the uplink SRS pilot, and some channel information is obtained after some processing, and then the channel information is generated by using the channel information.
  • Precoding the pilot the terminal performs channel measurement through the precoded pilot, and further feedbacks the CSI information.
  • the channel information obtained by the base station through reciprocity and the feedback CSI information are obtained together...
  • reciprocity is to perform channel reciprocity on different frequencies. Due to technical limitations, there will always be errors or only relatively coarse channel information, or feedback RI/PMI/CQI. However, since the base station has acquired a part of the channel information through reciprocity, the PMI dimension is significantly reduced; as shown in FIG.
  • a general base station can obtain a subspace in which a feature vector of a channel is located by reciprocity of a channel covariance matrix, but an accurate feature vector cannot be obtained, so a set of base vectors (beams) of the subspace can be used as a guide.
  • the terminal further reports more accurate CSI information by measuring the precoding pilot.
  • the difference between the TDD and the FDD system is that the base station can estimate the uplink channel through the uplink SRS pilot, and then obtain the downlink channel information through reciprocity; since the channel reciprocity of the TDD system is performed on the same frequency, it can be considered that the channel has been obtained.
  • the information of the channel part is good, and the main information is that the acquired CSI information is the interference part information; the interference part information is mainly reflected by the CQI; in general, in order to reduce the complexity, the FDD system and the TDD system should use the same architecture (framework The quantitative feedback of CSI is carried out.
  • the traditional TDD CSI measurement feedback technology mainly considers the framework design with Figure 1 and the unified design consideration of FDD. The main difference lies in the following two aspects:
  • the terminal adopts CQI reporting based on transmission diversity TxD;
  • the terminal Since the terminal does not report the PMI, it cannot be assumed to use the reported PMI for transmission, and then performs CQI calculation and reporting. Therefore, it is assumed that the CQI calculation and reporting are performed based on the transmission diversity method; since the base station can obtain an accurate channel matrix H, based on H and transmission.
  • the diversity mode CQI can be used to calculate the SINR corresponding to the optimal precoding.
  • the FDD system is mainly considered, and the unified design consideration of the targeted TDD feedback is lacking. This affects the performance of the TDD system (including feedback overhead and link adaptation).
  • TxD-based CQI feedback can not be applied to various scenarios well; CQI is calculated by means of transmission diversity, which will bring errors in the process of conversion. Since it is not based on perfect linear relationship, this kind of conversion in some scenarios. Will bring a significant performance loss.
  • a method for quantitative feedback of channel state information CSI includes:
  • the terminal acquires configuration information of a channel measurement pilot and a CSI feedback type sent by the base station, where the configuration information of the channel measurement pilot includes configuration information of the K sets of pilots, K ⁇ 1;
  • the terminal determines a CSI quantization feedback method according to the value of K and the CSI feedback type configuration information, and performs CSI quantization feedback according to the CSI quantization feedback method.
  • a terminal comprising channel state information CSI quantization feedback device, wherein the CSI quantization feedback device comprises:
  • the information obtaining module is configured to acquire configuration information of a channel measurement pilot and a CSI feedback type sent by the base station, where the configuration information of the channel measurement pilot includes configuration information of the K sets of pilots, K ⁇ 1;
  • the quantization feedback module is configured to determine a CSI quantization feedback method according to the value of K and the CSI feedback type configuration information, and perform CSI quantization feedback according to the CSI quantization feedback method.
  • the above scheme can be implemented by using a unified architecture for the CSI feedback of FDD and TDD.
  • the calculation method of CQI and the content reported by CSI can be judged according to the value of K.
  • a method for determining channel quality indication information CQI includes:
  • the terminal acquires configuration information of a channel measurement pilot and a CSI feedback type sent by the base station, where the configuration information of the channel measurement pilot includes configuration information of the K sets of pilots, K ⁇ 1;
  • the terminal calculates the CQI by using the precoding matrix of the convention and/or the configuration.
  • a terminal includes a CQI determining apparatus, where the CQI determining module includes:
  • the information acquiring module is configured to acquire configuration information of a channel measurement pilot and a CSI feedback type sent by the base station, where the configuration information of the channel measurement pilot includes configuration information of the K sets of pilots, where K ⁇ 1.
  • the above scheme calculates the CQI by the agreed and/or configured precoding matrix, and can obtain better performance than the transmission diversity method to calculate the CQI.
  • FIG. 1 is a schematic diagram of full-dimensional CSI measurement and feedback of an FDD system
  • FIG. 2 is a schematic diagram of CSI feedback of an FDD system based on measurement pilot selection
  • FIG. 3 is a schematic diagram of CSI feedback of a FDD system based on a reduced-dimensional precoding pilot
  • FIG. 4 is a flowchart of a CSI quantization feedback method method according to an embodiment of the present invention.
  • FIG. 5 is a block diagram of a CSI quantization feedback device in a terminal according to an embodiment of the present invention.
  • FIG. 6 is a schematic diagram of candidate patterns of CSI-RS resource locations
  • FIG. 7 is a flowchart of a method for determining a CQI according to Embodiment 2 of the present invention.
  • FIG. 8 is a block diagram of a CQI determining apparatus in a terminal according to Embodiment 2 of the present invention.
  • This embodiment provides a quantitative feedback method for channel state information CSI, as shown in FIG. 4, including:
  • Step 110 The terminal acquires configuration information of a channel measurement pilot and a CSI feedback type sent by the base station, where the configuration information of the channel measurement pilot includes configuration information of the K sets of pilots, K ⁇ 1;
  • the configuration information of the CSI feedback type includes: information indicating that the precoding matrix index PMI is enabled or disabled.
  • PMI the precoding matrix index
  • the configuration is PMI enabled; for the TDD system, the configuration is PMI is disabled.
  • the invention is not limited to this.
  • the terminal may obtain the configuration information of the channel measurement pilot from the channel measurement pilot configuration signaling sent by the base station, and acquire the configuration information of the CSI feedback type from the CSI feedback type configuration signaling sent by the base station.
  • Step 120 The terminal determines a CSI quantization feedback method according to the value of K and the CSI feedback type configuration information, and CSI quantization feedback is performed according to the CSI quantization feedback method.
  • the CSI quantization feedback method determined by the terminal according to the value of the K and the CSI feedback type configuration information may include:
  • the CQI is calculated using the precoding matrix of the convention and/or configuration
  • the CQI is calculated based on the transmission diversity method; or the CQI is directly measured using the single antenna port.
  • the precoding matrix calculation CQI using the convention and/or configuration may select one or more precodings from the agreed and/or configured codebook subsets according to the used rank RI and channel measurement pilot CSI-RS ports.
  • the CSI quantization feedback method determined by the terminal according to the value of the K and the CSI feedback type configuration information may include:
  • the CSI quantization feedback method determined by the terminal according to the value of the K and the CSI feedback type configuration information may include:
  • the embodiment further provides a terminal, including channel state information CSI quantization feedback device.
  • the CSI quantization feedback device includes:
  • the information obtaining module 10 is configured to acquire configuration information of a channel measurement pilot and a CSI feedback type sent by the base station, where the configuration information of the channel measurement pilot includes configuration information of the K sets of pilots, where K ⁇ 1.
  • the configuration information of the CSI feedback type includes: information indicating that the precoding matrix index PMI is enabled or disabled.
  • the quantization feedback module 20 is configured to determine a CSI quantization feedback method according to the value of K and the CSI feedback type configuration information, and perform CSI quantization feedback according to the CSI quantization feedback method.
  • the precoding matrix calculates the CQI.
  • the calculating the CQI using the pre-coding matrix and/or the configured precoding matrix may include: selecting one or more pre-selected from the agreed and/or configured codebook subset according to the used rank RI and the channel measurement pilot CSI-RS port.
  • the CSI quantization feedback method determined according to the value of K and the CSI feedback type configuration information includes: calculating CQI based on the manner of transmission diversity. Or, directly measure the CQI using a single antenna port.
  • the CSI quantization feedback method determined according to the value of K and the CSI feedback type configuration information includes:
  • the CSI quantization feedback method determined according to the value of K and the CSI feedback type configuration information includes:
  • the CSI feedback of the FDD and the TDD in this embodiment can be implemented by using a unified architecture, and the calculation method of the CQI and the content reported by the CSI can be determined according to the value of K.
  • This example describes the configuration information of the channel measurement pilot.
  • the base station sends the configuration information of the K-channel channel measurement pilot (CSI-RS) to the terminal, and the configuration information can be sent through the high layer signaling.
  • the base station transmits the K sets of pilots at resource locations indicated in the configuration information.
  • the base station may configure one or more sets of pilots to the terminal, including period information of each set of pilots, sequence information, time-frequency resource location pattern in the subframe, subframe offset information, etc.; as shown in FIG. Supports up to five 8-port patterns #0, #1, #2, #3, #4, #5 in a sub-frame. If you configure a 4-port pattern, you can configure 10, and a 2-port pattern can be configured with 20;
  • the DMRS is a De Modulation Reference Signal
  • the CSRS is a Cell-specific reference signal.
  • the configured period is 5ms
  • 5 seed frame offsets can be selected.
  • the maximum value of K can be increased by 5 times.
  • the configured period is 10ms and above, and the number of pilot sets K that can be configured will be more.
  • the base station sends K sets of CSI-RS pilots according to the configured period information, sequence information, time-frequency resource location pattern in the subframe, and subframe offset information.
  • the terminal detects configuration signaling sent by the base station, acquires pilot-related location information and sequence information, and then detects the received pilot signal at the corresponding location; and uses the received pilot signal and the learned pilot to transmit sequence information.
  • Channel estimation can be performed to obtain a channel matrix H.
  • This example shows that when the CSI feedback type configuration information indicates that the PMI is not enabled, the terminal determines the calculation mode of the CQI based on the value of K.
  • the selection of the CQI calculation mode generally assumes a transmission technique that may be adopted in the downlink, and estimates the signal to interference and noise ratio after the transmission technology is applied, the data is transmitted through the channel to the receiving end, and after passing through the receiver; It is better to judge the channel quality if the corresponding CQI level is selected.
  • the selected CQI level should be such that the block error rate of the downlink data channel transport block corresponding to the CQI in the corresponding modulation and coding mode does not exceed 0.1; as shown in the following table, each CQI sequence number corresponds to a modulation mode and code. rate.
  • the terminal selects one of the pilots and performs CQI reporting by means of transmission diversity.
  • the so-called transmission diversity mode assumes that space-time coding or space-frequency coding data transmission is further performed on the pilot port, and may also be a diversity mode of space-time/frequency coding + frequency domain antenna switching, and then estimating data under this assumption.
  • the transmission quality at the time of transmission that is, the SINR
  • the SINR can obtain a quantized CQI by the relationship of the link curve (SINR, CQI, BLER relationship) set in advance by the magnitude of the SINR.
  • the terminal can directly measure the CQI using a single antenna port when K>1.
  • the terminal can perform CQI calculation based on the precoding transmission, such as:
  • Method 1 Calculate the CQI using a pre-coding matrix of the convention.
  • the terminal and the base station may adopt the precoding matrix as stipulated in the following table, and use the codebook subset (including the precoding matrix indicating all hypotheses used in the table) corresponding to the currently used rank RI and the channel measurement pilot CSI-RS port.
  • a precoding matrix calculates the CQI.
  • one CQI can be calculated, or multiple CQIs can be calculated, such as calculating CQIs of multiple subbands.
  • Manner 2 Calculate the CQI using a precoding matrix configured by the base station.
  • the configuration signaling of the base station may use codebook subset selection signaling or codebook subset restriction signaling; the codebook subset restriction (CSR) is a codebook configuration signaling, which may also be called a codebook.
  • Selecting Codebook Subset Selection refers to limiting a set of codewords of a UE to a subset of a large codebook set, so that a codebook subset suitable for the UE can be selected according to the channel characteristics of the UE or the interference to other UEs can be reduced.
  • Codebook sub-collection can The complexity of the codebook selection of the UE is reduced, the overhead of the codebook feedback is reduced, and the direction of the UE beam is limited.
  • the signal is used to configure a codeword for CQI calculation for each combination of RI and CSI-RS ports; when using this method, since the PMI has only one unique choice, it can be specified that the PMI is not reported;
  • Manner 3 The combination of mode 1 and mode 2, for example, for some CSI-RS port configurations, such as 2 ports, adopting an agreed mode, and for other CSI-RS port configurations, such as 4 ports, a base station configuration mode is adopted. As shown in the following table:
  • the above example uses a precoding matrix to calculate the CQI
  • multiple precoding matrices may be selected to calculate the CQI
  • each precoding matrix may also be used to calculate one or more CQIs.
  • the CQIs fed back by the terminal also correspond to the plurality of precoding matrices respectively, and the base station can determine the correspondence between the CQI and the precoding matrix according to the agreement with the terminal.
  • This example shows that when the CSI feedback type configuration information indicates that the PMI is not enabled, the terminal determines the CSI type of the CSI feedback based on the value of K.
  • the RI is the rank information recommended based on the CSI-RS pilot
  • the CQI is the channel quality information calculated according to the pre-coding manner of the CSI-RS according to the convention or configuration.
  • the CRI is the CSI-RS resource information finally selected based on the multiple sets of CSI-RS pilot measurements, and the CQI is the channel quality information calculated according to the assumption of the transmission diversity according to the selected CSI-RS;
  • Acyclic feedback is also available.
  • This example shows that when the CSI feedback type configuration information indicates that the PMI is not enabled, the terminal determines the feedback mode based on the value of K;
  • the feedback mode refers to a combination of CSI (CQI/PMI/RI) feedback, including subband feedback and wideband feedback or selection of M subband feedback, including periodic feedback and aperiodic feedback.
  • the aperiodic feedback is transmitted in the PUSCH, and includes the following modes:
  • Mode 2-0 represents a sub-band feedback based on UE selection, a mode without PMI feedback, and Mode 3-0 represents a sub-band feedback based on a high-level configuration, and a mode without PMI feedback.
  • Mode 3-1, Mode 1-2, Mode 2-2, Mode 3-2 Indicates a mode that contains 1 or 2 PMI feedback.
  • the periodic feedback mode refers to a mode that is periodically fed back in the PUCCH, and includes the following modes:
  • Modes 1-0 represent bandwidth feedback, modes without PMI feedback, and modes 2-0 represent modes based on UE selected subband feedback and without PMI feedback.
  • Mode 1-1 and Mode 2-1 indicate modes including PMI feedback.
  • the base station and the terminal may agree to use the feedback mode that does not include the PMI for feedback, for example: PUSCH aperiodic feedback Mode 2-0, Mode 3-0; PUCCH period feedback Mode 1-0, Mode 2-0.
  • the base station and the terminal can agree to use the feedback mode including the PMI for feedback. In this case, even if the base station is configured with PMI not enabled signaling, the PMI needs to be fed back.
  • the embodiment provides a method for determining channel quality indication information CQI. As shown in FIG. 7, the method includes:
  • Step 210 The terminal acquires configuration information of a channel measurement pilot and a CSI feedback type sent by the base station, where the configuration information of the channel measurement pilot includes configuration information of the K sets of pilots, K ⁇ 1;
  • the configuration information of the CSI feedback type includes: information indicating that the precoding matrix index PMI is enabled or disabled. For example, for the FDD system, the configuration is PMI enabled; for the TDD system, the configuration is PMI is disabled. However, the invention is not limited to this.
  • the terminal may obtain the configuration information of the channel measurement pilot from the channel measurement pilot configuration signaling sent by the base station, and acquire the configuration information of the CSI feedback type from the CSI feedback type configuration signaling sent by the base station.
  • the calculating, by using the preamble and/or the configured precoding matrix, the CQI includes: selecting one or more from the agreed and/or configured codebook subset according to the used rank RI and the channel measurement pilot CSI-RS port. Precoding matrices, each of which is used to calculate one or more CQIs.
  • the configured codebook subset may be obtained by the terminal from the codebook restriction signaling sent by the base station.
  • the above CSI-RS port may be configured by a base station or may be selected by a terminal.
  • the RI can be selected by the terminal but is not limited thereto.
  • the embodiment further provides a terminal, including a CQI determining apparatus.
  • the CQI determining module includes:
  • the information obtaining module 50 is configured to acquire configuration information of a channel measurement pilot and a CSI feedback type sent by the base station, where the configuration information of the channel measurement pilot includes configuration information of the K sets of pilots, where K ⁇ 1.
  • one or more precoding matrices may be selected from the agreed and/or configured codebook subsets according to the used rank RI and channel measurement pilot CSI-RS ports, each precoding moment being used to calculate one or more CQIs .
  • the information acquiring module is further configured to obtain the configured codebook subset from the codebook restriction signaling sent by the base station.
  • the terminal computing CQI needs to assume a transmission technology, such as precoding transmission technology.
  • a transmission technology such as precoding transmission technology.
  • different precoding weights have completely different performances.
  • the terminal In the case of PMI feedback, the terminal generally assumes that the terminal is used. It is the precoding corresponding to the PMI of the feedback. After the PMI is fed back to the base station, the base station can also know that the CQI of the feedback is calculated according to the precoding corresponding to the PMI.
  • the terminal can obtain the precoding weights for CQI calculation in the following ways:
  • the base station indicates, by using the signaling configuration, the UE calculates the precoding weight used by the CQI; in the prior art, the existing codebook restriction signaling (for the codeword limitation when the codebook feedback exists, but the PMI feedback overhead does not follow the effective Number of codewords And changing, no configuration without PMI feedback is a good way.
  • the codebook restriction signaling is also introduced to indicate the calculation of the CQI, and a codeword (precoding matrix) is configured for the CQI measurement under the codebook corresponding to each combination of the RI and the CSI-RS port, of course. It can also be multiple codewords, each of which can be used for one or more CQI measurements, but does not require feedback PMI at this time.
  • the base station and the terminal stipulate that the codebook corresponding to each combination of the RI and the CSI-RS ports existing in the LTE protocol uses one codeword for the CQI measurement corresponding to the RI, and of course, may be multiple, for multiple Measurement of CQI.
  • Method 3 The combination of mode one and mode two.
  • the 4Tx codebook defined by Release 8 of LTE (single PMI codebook), the total number of layers ⁇ is 1, 2, 3, and 4.
  • the main codebook has only one index:
  • the method and apparatus provided by the foregoing embodiments of the present invention can be applied to a communication system, in particular, in a multi-antenna system, by calculating a CQI through a pre-coding matrix of a convention and/or configuration, a CQI can be calculated in a manner similar to transmission diversity. Better performance.

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Abstract

一种信道状态信息量化反馈方法及终端，终端获取基站发送的信道测量导频和CSI反馈类型的配置信息，所述信道测量导频的配置信息包括K套导频的配置信息，K≥1；所述终端根据K的取值和CSI反馈类型配置信息确定CSI量化反馈方法，并按照所述CSI量化反馈方法进行CSI量化反馈。所述终端包括CSI量化反馈装置，该所述CSI量化反馈装置包括信息获取模块和量化反馈模块。本申请对于FDD和TDD的CSI反馈可以利用统一的架构实现，可以根据K的取值来判断CQI的计算方法以及CSI上报的内容。

Description

一种信道状态信息量化反馈方法及终端 技术领域
本发明涉及无线通信领域，尤其涉及多天线系统中的一种信道信息量化反馈方法及终端。
背景技术
无线通信系统中，发送端和接收端采取空间复用的方式使用多根天线来获取更高的速率。相对于一般的空间复用方法，一种增强的技术是接收端反馈给发送端信道信息，发送端根据获得的信道信息使用发射预编码技术，可以极大地提高传输性能。对于单用户多输入多输出(SU-MIMO，其中的MIMO表示Multi-input Multi-output，多输入多输出)中，直接使用信道特征矢量信息进行预编码；对于多用户MIMO(MU-MIMO)中，需要比较准确的信道信息。下面介绍一些与基站侧信道状态信息(CSI：channel state information，包括channel部分和interference部分)的获取、终端侧CSI量化反馈相关的基本内容。
FDD系统目前存在以下几种典型的CSI反馈场景和对应的反馈技术；
CSI反馈场景1：基站不能通过互易性获取信状态道信息时的CSI反馈。
这种情况在FDD系统中比较常见，一些基站系统，不能通过互易性获取下行信道的信息，需要通过CSI反馈测量。由于考虑支持的天线维度不大，一般小于等于8，信道测量导频和CSI反馈开销可以接受，为了简单起见，采用了全维的测量与CSI反馈。例如早期的LTE版本中FDD主要考虑这种场景，使用全维的导频和CSI反馈，反馈采用的方式是隐式反馈，首先，基站发送一套信道测量导频给终端，终端基于该导频进行信道测量及CSI量化反馈，如图1所示。
一般来说CSI的内容主要包括(RI/PMI/CQI)：信道质量指示信息(Channel quality indication，简称为CQI)、预编码矩阵指示符(Precoding Matrix Indicator，简称为PMI)和秩指示符(Rank Indicator，简称为RI)。CQI为衡量下行信道质量好坏的一个指标。CQI可以理解为信干噪比SINR的一种量化，在36-213协议中CQI用0～15的整数值来表示，分别代表了不同的CQI等级，不同CQI对应着各自的调制方式和编码码率(MCS)。RI用于描述空 间独立信道的个数，对应信道响应矩阵的秩。在空间复用模式下，需要UE反馈RI信息，其他模式下不需要反馈RI信息。信道矩阵的秩和层数对应。PMI反馈的是最佳预编码信息，基于索引反馈，指示约定的码本中最匹配当前信道的特征的码字。
随着技术发展，在天线数目增多且考虑3D MIMO应用以后，采用了更复杂的测量与反馈技术，包括：基站发送N套导频给终端进行信道状态信息测量，N≥2。终端选择其中的一套导频，并上报CRI(CSI-RS Resource Index,信道测量导频资源索引)给基站，终端基于选择的信道测量导频上报RI/PMI/CQI；这种方式可以选择最佳的CSI-RS resource进行测量(可以理解为信道信息反馈的一部分)，再结合传统的CSI反馈，基站可以通过CRI和传统CSI反馈获得总的信道信息，如图2所示。该技术的一种典型应用就是垂直扇区虚拟化技术，基站利用不同的预编码生成不同方向的波束，覆盖不同的垂直方向；UE选择最佳的预编码导频(垂直波束)，进而基于该预编码导频进行水平维度CSI反馈。基站基于终端的预编码导频(垂直波束)选择信息的上报以及水平维度的CSI反馈，结合预编码导频使用的权值，获得比较完整的信道状态信息。
CSI反馈场景2：基站能通过FDD互易性获取信道部分信息时的CSI反馈/
FDD系统不完全的信道信息获取的情况：FDD系统中对于一些散射不是很丰富的信道，可以通过上行SRS导频估计出上行信道，经过一些处理后获得部分信道信息，进而利用这部分信道信息生成预编码导频，终端通过预编码导频进行信道测量，进一步的反馈CSI信息。基站通过互易性获得的信道信息和反馈的CSI信息共同得到……？；对于FDD系统，互易性是在不同的频率上进行信道互易，由于技术限制，总是会带来误差或者说只能获得比较粗略的信道部分的信息，还是需要反馈RI/PMI/CQI，但由于基站已经通过互易性获取了一部分信道信息，PMI的维度有明显的降低；如图3所示。
这种方法，一般基站通过信道协方差矩阵的互易性可以获得信道的特征矢量所在的子空间，但无法获知准确的特征矢量，因此可以使用该子空间的一组基矢量(波束)作为导频的预编码，终端通过测量该预编码导频进一步地上报更准确的CSI信息。
如上所述，对于FDD系统，目前CSI测量及反馈的标准化技术定义了以下反馈方法：基站可以配置K套导频给终端，K为正整数；当K>1时，终端按照图2所示进行CSI-RS导频选择和RI/PMI/CQI量化反馈；当K＝1时，如果为降维预编码导频，流程如图3所示，基站可 以配置针对性的适合降维反馈的码本进行CSI量化反馈，如果为如图1所示的传统的量化反馈方式，则可以配置传统的码本进行CSI的量化反馈。
TDD系统的CSI反馈应用场景和反馈技术：
TDD与FDD系统不同的是，基站可以通过上行的SRS导频估计出上行信道，继而通过互易性获得下行信道信息；由于TDD系统信道互易是在相同的频率上进行的，可以认为已经获得了很好的信道部分的信息，主要期望获取的CSI信息是干扰部分信息；干扰部分信息主要由CQI反映；一般来说，为了减小复杂度，FDD系统和TDD系统应该使用相同的架构(framework)进行CSI的量化反馈，传统的TDD CSI测量反馈技术主要考虑与图1中的framework，与FDD进行统一设计考虑，主要区别在于以下两个方面：
区别1：终端采用了基于传输分集TxD的CQI上报；
由于终端没有上报PMI，不能假设使用上报的PMI进行传输，进而进行CQI计算和上报，因此假设了基于传输分集的方式进行CQI计算及上报；由于基站可以获得准确的信道矩阵H，基于H和传输分集方式CQI可以折算出使用最优预编码时对应的SINR。
区别2：没有RI和PMI信息，需要一个信令通知PMI/RI I不使能(diabling)。
但是，对于图2和图3所示的新的CSI测量反馈framework，主要考虑了FDD系统，缺少针对性的TDD反馈的统一设计考虑。因此影响了TDD系统的性能(包括反馈开销和链路自适应)。另外，基于TxD的CQI反馈不能很好的应用于各种场景；以传输分集的方式计算CQI，其折算过程中会带来误差，由于不是基于完美的线性关系进行折算，一些场景下这种折算会带来比较明显的性能损失。
发明内容
有鉴于此，本发明实施例提供了以下技术方案。
一种信道状态信息CSI的量化反馈方法，包括：
终端获取基站发送的信道测量导频和CSI反馈类型的配置信息，所述信道测量导频的配置信息包括K套导频的配置信息，K≥1；
所述终端根据K的取值和CSI反馈类型配置信息确定CSI量化反馈方法，并按照所述CSI量化反馈方法进行CSI量化反馈。
一种终端，包括信道状态信息CSI量化反馈装置，其特征在于，所述CSI量化反馈装置包括：
信息获取模块，设置为获取基站发送的信道测量导频和CSI反馈类型的配置信息，所述信道测量导频的配置信息包括K套导频的配置信息，K≥1；
量化反馈模块，设置为根据K的取值和CSI反馈类型配置信息确定CSI量化反馈方法，并按照所述CSI量化反馈方法进行CSI量化反馈。
上述方案对于FDD和TDD的CSI反馈可以利用统一的架构实现，可以根据K的取值来判断CQI的计算方法以及CSI上报的内容。
有鉴于此，本发明实施例还提供了以下技术方案。
一种确定信道质量指示信息CQI的方法，包括：
终端获取基站发送的信道测量导频和CSI反馈类型的配置信息，所述信道测量导频的配置信息包括K套导频的配置信息，K≥1；
所述终端在所述CSI反馈类型的配置信息表示预编码矩阵索引PMI不使能，且K＝1时，使用约定和/或配置的预编码矩阵计算CQI。
一种终端，包括CQI确定装置，其特征在于，所述CQI确定模块包括：
信息获取模块，设置为获取基站发送的信道测量导频和CSI反馈类型的配置信息，所述信道测量导频的配置信息包括K套导频的配置信息，K≥1。
CQI计算模块，设置为在所述CSI反馈类型的配置信息表示预编码矩阵索引PMI不使能，且K＝1时，使用约定和/或配置的预编码矩阵计算CQI。
上述方案通过约定和/或配置的预编码矩阵计算CQI，可以取得比传输分集的方式计算CQI更好的性能。
附图说明
图1是FDD系统全维CSI测量与反馈的示意图；
图2是FDD系统基于测量导频选择的CSI反馈的示意图；
图3是FDD系统基于降维预编码导频的CSI反馈的示意图；
图4是本发明实施例一CSI量化反馈方法方法的流程图；
图5是本发明实施例一终端中CSI量化反馈装置的模块图；
图6是CSI-RS资源位置的候选图样的示意图；
图7是本发明实施例二确定CQI的方法的流程图；
图8是本发明实施例二终端中CQI确定装置的模块图。
具体实施方式
为使本发明的目的、技术方案和优点更加清楚明白，下文中将结合附图对本发明的实施例进行详细说明。需要说明的是，在不冲突的情况下，本申请中的实施例及实施例中的特征可以相互任意组合。
实施例一
本实施例提供了一种信道状态信息CSI的量化反馈方法，如图4所示，包括：
步骤110，终端获取基站发送的信道测量导频和CSI反馈类型的配置信息，所述信道测量导频的配置信息包括K套导频的配置信息，K≥1；
本步骤中，所述CSI反馈类型的配置信息包括：表示预编码矩阵索引PMI使能或者不使能的信息。例如，对FDD系统，配置为PMI使能；对TDD系统，配置为PMI不使能。但本发明不局限于此。
终端可以从基站发送的信道测量导频配置信令中获取所述信道测量导频的配置信息，从基站发送的CSI反馈类型配置信令中获取所述CSI反馈类型的配置信息。
步骤120，所述终端根据K的取值和CSI反馈类型配置信息确定CSI量化反馈方法，并 按照所述CSI量化反馈方法进行CSI量化反馈。
本步骤中，所述CSI反馈类型配置信息表示PMI不使能时，所述终端根据K的取值和CSI反馈类型配置信息确定的CSI量化反馈方法可以包括：
K＝1时，使用约定和/或配置的预编码矩阵计算CQI；
K>1时，基于传输分集的方式计算CQI；或者使用单天线端口直接测量CQI。
其中，所述使用约定和/或配置的预编码矩阵计算CQI如可以根据使用的秩RI和信道测量导频CSI-RS端口，从约定和/或配置的码本子集中选择一个或多个预编码矩阵，每一个预编码矩用于计算一个或多个CQI。相对于基于传输分集的方式计算CQI，这种计算CQI的方式在一些应用场景下性能更好。
本步骤中，所述CSI反馈类型配置信息表示PMI不使能时，所述终端根据K的取值和CSI反馈类型配置信息确定的CSI量化反馈方法可以包括：
K＝1时，反馈RI以及CQI。
K>1时，反馈CRI以及CQI。
本步骤中，所述CSI反馈类型配置信息表示PMI不使能时，所述终端根据K的取值和CSI反馈类型配置信息确定的CSI量化反馈方法可以包括：
K＝1时，使用不包含PMI的反馈模式进行反馈；
K>1时，使用包含PMI的反馈模式进行反馈。
本实施例还提供了一种终端，包括信道状态信息CSI量化反馈装置，如图5所示，所述CSI量化反馈装置包括：
信息获取模块10，设置为获取基站发送的信道测量导频和CSI反馈类型的配置信息，所述信道测量导频的配置信息包括K套导频的配置信息，K≥1。其中，所述CSI反馈类型的配置信息包括：表示预编码矩阵索引PMI使能或者不使能的信息。
量化反馈模块20，设置为根据K的取值和CSI反馈类型配置信息确定CSI量化反馈方法，并按照所述CSI量化反馈方法进行CSI量化反馈。
可选地，
所述量化反馈模块20在CSI反馈类型配置信息表示PMI不使能，且K＝1时，根据K的取值和CSI反馈类型配置信息确定的CSI量化反馈方法包括：使用约定和/或配置的预编码矩阵计算CQI。其中，所述使用约定和/或配置的预编码矩阵计算CQI可以包括：根据使用的秩RI和信道测量导频CSI-RS端口，从约定和/或配置的码本子集中选择一个或多个预编码矩阵，每一个预编码矩用于计算一个或多个CQI。
可选地，
所述量化反馈模块20在CSI反馈类型配置信息表示PMI不使能，且K>1时，根据K的取值和CSI反馈类型配置信息确定的CSI量化反馈方法包括：基于传输分集的方式计算CQI；或者，使用单天线端口直接测量CQI。
可选地，
所述量化反馈模块CSI反馈类型配置信息表示PMI不使能时，根据K的取值和CSI反馈类型配置信息确定的CSI量化反馈方法包括：
K＝1时，反馈RI以及CQI。
K>1时，反馈CRI以及CQI。
可选地，
所述量化反馈模块CSI反馈类型配置信息表示PMI不使能时，根据K的取值和CSI反馈类型配置信息确定的CSI量化反馈方法包括：
K＝1时，使用不包含PMI的反馈模式进行反馈；
K>1时，使用包含PMI的反馈模式进行反馈。
本实施例对于FDD和TDD的CSI反馈可以利用统一的架构实现，可以根据K的取值来判断CQI的计算方法以及CSI上报的内容。
下面给出基于实施例一的一些示例进行说明。
示例一
本示例对信道测量导频的配置信息进行说明。
基站发送K套信道测量导频(CSI-RS)的配置信息给终端，该配置信息的下发可以通过高层信令。基站在配置信息中指示的资源位置发送所述K套导频。
基站可以配置一套或多套导频给终端，包括了每套导频的周期信息，序列信息，子帧内的时频资源位置图样，子帧偏置信息等；如图6所示，同一个子帧中支持最多配5个8端口的图样#0，#1，#2，#3，#4，#5，如果配置4端口图样可以配置10个，2端口图样可以配置20个；其中的DMRS是解调参考信号(De Modulation Reference Signal)，CSRS是小区专有参考信号(Cell-specific reference signals)。
如果考虑不同的子帧偏置情况，假设配置的周期为5ms，那么可以有5种子帧偏置可选，在原有的可配置导频的基础上，K的最大取值可以增加5倍，如果配置的周期为10ms及以上，可以配置的导频套数K会更多一些。
基站按照配置的周期信息，序列信息，子帧内的时频资源位置图样，子帧偏置信息分别发送K套CSI-RS导频。
终端检测基站发送的配置信令，获取导频相关的位置信息和序列信息，继而可以在相应的位置检测到接收到的导频信号；利用接收的导频信号和获知的导频发送序列信息，可以进行信道估计，得到信道矩阵H。
示例二
本示例说明当CSI反馈类型配置信息指示PMI不使能时，终端基于K的取值判断CQI的计算方式。
CQI计算方式的选择一般是假设一种下行可能采用的传输技术，估计出在该传输技术被应用，数据发送经过信道到达接收端，经过接收机后的信干噪比；继而根据该信干噪比判断出信道质量如选择出相应的CQI等级。所选择的CQI等级，应使得该CQI所对应的下行数据信道传输块在相应的调制编码方式下的误块率不超过0.1；如下表所示，每个CQI序号对应了一种调制方式和码率。
表1:4比特CQI表格
Figure PCTCN2016104645-appb-000001
本示例中，在K>1时，终端选择其中一套导频，并利用传输分集的方式进行CQI上报。 所谓传输分集方式，即假设在导频端口上进一步进行空时编码或者空频编码的数据传输，也可以是空时/频编码+频域天线切换的分集方式，继而在这种假设下估计数据传输时的传输质量，即SINR，通过SINR的大小可以由预先设置的链路曲线对应关系(SINR，CQI，BLER关系)得到一个量化的CQI。在另一示例中，在K>1时，终端可以使用单天线端口直接测量CQI。
本示例中，K＝1时，终端可以基于预编码传输的方式进行CQI计算，比如：
方式一：使用约定的一个预编码矩阵计算CQI。终端和基站可以采用下表约定的预编码矩阵，使用表中约定的码本子集(包括表示所有假设使用的预编码矩阵)中对应于当前使用的秩RI和信道测量导频CSI-RS端口的一个预编码矩阵计算CQI。
Figure PCTCN2016104645-appb-000002
利用一个预编码矩阵计算CQI时，可以计算一个CQI，也可以计算多个CQI如计算多个子带的CQI。
方式二：使用基站配置的一个预编码矩阵计算CQI。
基站的配置信令可以采用码本子集选择信令或者是码本子集限制信令；码本子集限制Codebook subset restriction(CSR)是一种码本配置信令，也可以称为码本子集选择Codebook Subset Selection，指把一个UE的码字集合限制在一个大的码本集合里子集合，这样可以根据UE的信道特征选择适合该UE的码本子集合或者减小对其它UE的干扰的码本子集合，可以 减小UE的码本选择复杂度，减小码本反馈的开销，限制UE波束的方向。这里用该信令对于每种RI和CSI-RS端口的组合配置一个码字用于CQI计算；当采用这种方法时，由于PMI只有一种唯一的选择，因此可以规定不上报PMI；
Figure PCTCN2016104645-appb-000003
方式三：方式一和方式二的结合，如对于某些CSI-RS端口配置如2端口，采用约定方式，对于另一些CSI-RS端口配置如4端口，采用基站配置方式。如下表所示：
Figure PCTCN2016104645-appb-000004
虽然以上示例是选用一个预编码矩阵计算CQI，但在其他示例中，也可以选用多个(如2个)预编码矩阵来计算CQI，每一个预编码矩阵也可以用于计算一个或多个CQI。相应地，终端反馈的CQI也是分别对应于多个预编码矩阵的，基站可以根据与终端的约定确定CQI和预编码矩阵的对应关系。
示例三
本示例说明CSI反馈类型配置信息指示PMI不使能时，终端基于K的取值判断CSI反馈的CSI类型。
比如在周期反馈中，如果配置K＝1，PMI不使能时，按照以下方式进行周期反馈；
RI，CQI，CQI，……，RI，CQI，CQI，……
其中，RI为基于该CSI-RS导频推荐的秩信息，CQI为基于CSI-RS按照约定或配置的预编码方式计算得到的信道质量信息。
如果配置K>1，PMI不使能时则按照以下方式进行周期反馈；
CRI，CQI，CQI，……，CRI，CQI，CQI，……
其中，CRI为基于多套CSI-RS导频测量最终选择的CSI-RS resource信息，CQI为基于选择的CSI-RS按照传输分集的假设计算得到的信道质量信息；
非周期反馈也可。
示例四
本示例说明当CSI反馈类型配置信息指示PMI不使能时，终端基于K的取值判断反馈模式；
反馈模式(feedback mode)是指CSI(CQI/PMI/RI)反馈的指令组合，包括子带反馈和宽带反馈或者选择M个子带反馈等，包括周期反馈和非周期反馈。其中，非周期反馈在PUSCH里传输，包括如下模式：
Figure PCTCN2016104645-appb-000005
例如，模式(Mode)2-0表示基于UE选择的子带反馈、不带PMI反馈的模式，模式3-0表示基于高层配置的子带反馈、不带PMI反馈的模式。模式3-1，模式1-2，模式2-2，模式3-2 表示包含1个或2个PMI反馈的模式。
周期反馈模式是指周期地在PUCCH里反馈的模式，它包括如下模式：
Figure PCTCN2016104645-appb-000006
其中，模式(Mode)1-0表示带宽反馈、不带PMI反馈的模式，模式2-0表示基于UE选择的子带反馈、不带PMI反馈的模式。模式1-1、模式2-1表示包含PMI反馈的模式。
当K＝1时，基站和终端可以约定使用不包含PMI的反馈模式进行反馈，例如：PUSCH非周期反馈Mode 2-0，Mode 3-0；PUCCH周期反馈Mode 1-0，Mode 2-0。
当K>1时，基站和终端可以约定使用包含PMI的反馈模式进行反馈，此时即使基站配置了PMI不使能信令，也需反馈PMI。
也即，K＝1时，支持PMI不使能。但K>1时PMI不使能信令会失效，终端都理解为需要上报PMI，
实施例二
本实施例提供一种确定信道质量指示信息CQI的方法，如图7所示，包括：
步骤210，终端获取基站发送的信道测量导频和CSI反馈类型的配置信息，所述信道测量导频的配置信息包括K套导频的配置信息，K≥1；
所述CSI反馈类型的配置信息包括：表示预编码矩阵索引PMI使能或者不使能的信息。例如，对FDD系统，配置为PMI使能；对TDD系统，配置为PMI不使能。但本发明不局限于此。
终端可以从基站发送的信道测量导频配置信令中获取所述信道测量导频的配置信息，从基站发送的CSI反馈类型配置信令中获取所述CSI反馈类型的配置信息。
步骤220，所述终端在所述CSI反馈类型的配置信息表示预编码矩阵索引PMI不使能，且K＝1时，使用约定和/或配置的预编码矩阵计算CQI。
本步骤中，所述使用约定和/或配置的预编码矩阵计算CQI，包括：根据使用的秩RI和信道测量导频CSI-RS端口，从约定和/或配置的码本子集中选择一个或多个预编码矩阵，每一个预编码矩用于计算一个或多个CQI。所述配置的码本子集可以是终端从基站发送的码本限制信令中获取的。
上述CSI-RS端口可以由基站配置，也可以由终端选择。RI可以由终端选择但不局限于此。
本实施例还提供一种终端，包括CQI确定装置，如图8所示，所述CQI确定模块包括：
信息获取模块50，设置为获取基站发送的信道测量导频和CSI反馈类型的配置信息，所述信道测量导频的配置信息包括K套导频的配置信息，K≥1。
CQI计算模块60，设置为在所述CSI反馈类型的配置信息表示预编码矩阵索引PMI不使能，且K＝1时，使用约定和/或配置的预编码矩阵计算CQI。例如，可以根据使用的秩RI和信道测量导频CSI-RS端口，从约定和/或配置的码本子集中选择一个或多个预编码矩阵，每一个预编码矩用于计算一个或多个CQI。
可选地，所述信息获取模块还设置为从基站发送的码本限制信令中获取所述配置的码本子集。
终端计算CQI需要假设一种传输技术，比如预编码传输技术，但预编码传输技术中，不同的预编码权值会有完全不同的性能，在有PMI反馈的情况下，终端一般会假设使用的是反馈的PMI对应的预编码，PMI被反馈给基站后，基站也能够获知反馈的CQI是依据该PMI对应的预编码进行计算获得的。但一些情况，比如TDD系统中，并没有PMI的反馈，因此终端可以采用以下方式获取预编码权值进行CQI计算：
方式一：
基站通过信令配置来指示UE计算CQI使用的预编码权值；在现有技术中，已经存在的码本限制信令(用于存在码本反馈时的码字限制，但PMI反馈开销不随有效码字的数量变化 而改变，没有PMI反馈时无需配置)就是一种很好的途径。在没有PMI反馈时，也引入码本限制信令用于指示CQI的计算，RI和CSI-RS端口的每一组合对应的码本下配置一个码字(预编码矩阵)用于CQI测量，当然，也可以是多个码字，每个码字可用于一个或多个CQI的测量，但此时不需要反馈PMI。
方式二：
基站和终端约定，在LTE协议中存在的RI和CSI-RS端口的每一组合对应的码本，采用一个码字用于该RI对应的CQI测量，当然，也可以是多个，用于多个CQI的测量。
方式三：方式一和方式二的结合。
对于以上三种方式，实施例一示例二中已经给出了一些示例。这里再给出几个码本子集的示例：
比如LTE 2Tx码本中的码字：
Figure PCTCN2016104645-appb-000007
比如LTE 4Tx码本中的码字：
LTE的Release 8定义的4Tx码本(单PMI码本)，总层数υ的取值为1,2,3,4主码本均只有1个索引的情况：
Figure PCTCN2016104645-appb-000008
上述本发明实施例序号仅仅为了描述，不代表实施例的优劣。通过以上的实施方式的描述，本领域的技术人员可以清楚地了解到上述实施例方法可借助软件加必需的通用硬件平台的方式来实现，当然也可以通过硬件，但很多情况下前者是更佳的实施方式。基于这样的理 解，本发明实施例的技术方案本质上或者说对现有技术做出贡献的部分可以以软件产品的形式体现出来，该计算机软件产品存储在一个存储介质(如ROM/RAM、磁碟、光盘)中，包括若干指令用以使得一台终端设备(可以是手机，计算机，服务器，或者网络设备等)执行本发明各个实施例所述的方法。
以上仅为本发明的优选实施例，并非因此限制本发明的专利范围，凡是利用本发明说明书及附图内容所作的等效结构或等效流程变换，或直接或间接运用在其他相关的技术领域，均同理包括在本发明的专利保护范围内。
工业实用性
本发明上述实施例所提供的方法和装置可以被应用于通信系统中，特别是应用在多天线系统中，通过约定和/或配置的预编码矩阵计算CQI，可以取得比传输分集的方式计算CQI更好的性能。

Claims (20)

  1. 一种信道状态信息CSI的量化反馈方法，包括：
    终端获取基站发送的信道测量导频和CSI反馈类型的配置信息，所述信道测量导频的配置信息包括K套导频的配置信息，K≥1；
    所述终端根据K的取值和CSI反馈类型配置信息确定CSI量化反馈方法，并按照所述CSI量化反馈方法进行CSI量化反馈。
  2. 如权利要求1所述的量化反馈方法，其中：
    所述CSI反馈类型的配置信息包括：表示预编码矩阵索引PMI使能或者不使能的信息。
  3. 如权利要求2所述的量化反馈方法，其中：
    所述CSI反馈类型配置信息表示PMI不使能，且K＝1时，所述终端根据K的取值和CSI反馈类型配置信息确定的CSI量化反馈方法包括：
    使用约定和/或配置的预编码矩阵计算信道质量指示信息CQI。
  4. 如权利要求3所述的量化反馈方法，其中：
    所述使用约定和/或配置的预编码矩阵计算CQI，包括：根据使用的秩RI和信道测量导频CSI-RS端口，从约定和/或配置的码本子集中选择一个或多个预编码矩阵，每一个预编码矩用于计算一个或多个CQI。
  5. 如权利要求2或3或4所述的量化反馈方法，其中：
    所述CSI反馈类型配置信息表示PMI不使能，且K>1时，所述终端根据K的取值和CSI反馈类型配置信息确定的CSI量化反馈方法包括：
    基于传输分集的方式计算CQI；或者
    使用单天线端口直接测量CQI。
  6. 如权利要求2所述的量化反馈方法，其中：
    所述CSI反馈类型配置信息表示PMI不使能，所述终端根据K的取值和CSI反馈类型配置信息确定的CSI量化反馈方法包括：
    K＝1时，反馈RI以及CQI。
    K>1时，反馈CRI以及CQI。
  7. 如权利要求3或4所述的方法，其中：
    所述CSI反馈类型配置信息表示PMI不使能，所述终端根据K的取值和CSI反馈类型配置信息确定的CSI量化反馈方法包括：
    K＝1时，使用不包含PMI的反馈模式进行反馈；
    K>1时，使用包含PMI的反馈模式进行反馈。
  8. 一种终端，包括信道状态信息CSI量化反馈装置，其中，所述CSI量化反馈装置包括：
    信息获取模块，设置为获取基站发送的信道测量导频和CSI反馈类型的配置信息，所述信道测量导频的配置信息包括K套导频的配置信息，K≥1；
    量化反馈模块，设置为根据K的取值和CSI反馈类型配置信息确定CSI量化反馈方法，并按照所述CSI量化反馈方法进行CSI量化反馈。
  9. 如权利要求8所述的量化反馈方法，其中：
    所述CSI反馈类型的配置信息包括：表示预编码矩阵索引PMI使能或者不使能的信息。
  10. 如权利要求9所述的量化反馈方法，其中：
    所述量化反馈模块在CSI反馈类型配置信息表示PMI不使能，且K＝1时，根据K的取值和CSI反馈类型配置信息确定的CSI量化反馈方法包括：使用约定和/或配置的预编码矩阵计算CQI。
  11. 如权利要求10所述的量化反馈方法，其中：
    所述使用约定和/或配置的预编码矩阵计算CQI，包括：根据使用的秩RI和信道测量导频CSI-RS端口，从约定和/或配置的码本子集中选择一个或多个预编码矩阵，每一个预编码矩用于计算一个或多个CQI。
  12. 如权利要求9或10或11所述的量化反馈方法，其中：
    所述量化反馈模块在CSI反馈类型配置信息表示PMI不使能，且K>1时，根据K的取值和CSI反馈类型配置信息确定的CSI量化反馈方法包括：基于传输分集的方式计算CQI；或者，使用单天线端口直接测量CQI。
  13. 如权利要求9所述的量化反馈方法，其中：
    所述量化反馈模块在CSI反馈类型配置信息表示PMI不使能时，根据K的取值和CSI反馈类型配置信息确定的CSI量化反馈方法包括：
    K＝1时，反馈RI以及CQI。
    K>1时，反馈CRI以及CQI。
  14. 如权利要求3或4所述的方法，其中：
    所述量化反馈模块在CSI反馈类型配置信息表示PMI不使能时，根据K的取值和CSI反馈类型配置信息确定的CSI量化反馈方法包括：
    K＝1时，使用不包含PMI的反馈模式进行反馈；
    K>1时，使用包含PMI的反馈模式进行反馈。
  15. 一种确定信道质量指示信息CQI的方法，包括：
    终端获取基站发送的信道测量导频和CSI反馈类型的配置信息，所述信道测量导频的配置信息包括K套导频的配置信息，K≥1；
    所述终端在所述CSI反馈类型的配置信息表示预编码矩阵索引PMI不使能，且K＝1时，使用约定和/或配置的预编码矩阵计算CQI。
  16. 如权利要求15所述的方法，其中：
    所述使用约定和/或配置的预编码矩阵计算CQI，包括：根据使用的秩RI和信道测量导频CSI-RS端口，从约定和/或配置的码本子集中选择一个或多个预编码矩阵，每一个预编码矩用于计算一个或多个CQI。
  17. 如权利要求15或16所述的方法，其中：
    所述配置的码本子集是终端从基站发送的码本限制信令中获取的。
  18. 一种终端，包括CQI确定装置，其中，所述CQI确定装置包括：
    信息获取模块，设置为获取基站发送的信道测量导频和CSI反馈类型的配置信息，所述信道测量导频的配置信息包括K套导频的配置信息，K≥1。
    CQI计算模块，设置为在所述CSI反馈类型的配置信息表示预编码矩阵索引PMI不使能，且K＝1时，使用约定和/或配置的预编码矩阵计算CQI。
  19. 如权利要求18所述的终端，其中：
    所述CQI计算模块使用约定和/或配置的预编码矩阵计算CQI，包括：根据使用的秩RI和信道测量导频CSI-RS端口，从约定和/或配置的码本子集中选择一个或多个预编码矩阵，每一个预编码矩用于计算一个或多个CQI。
  20. 如权利要求15或16所述的终端，其中：
    所述信息获取模块还设置为从基站发送的码本限制信令中获取所述配置的码本子集。
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