WO2011023135A1 - 信道状态信息的传输方法、装置和系统 - Google Patents

信道状态信息的传输方法、装置和系统 Download PDF

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Publication number
WO2011023135A1
WO2011023135A1 PCT/CN2010/076441 CN2010076441W WO2011023135A1 WO 2011023135 A1 WO2011023135 A1 WO 2011023135A1 CN 2010076441 W CN2010076441 W CN 2010076441W WO 2011023135 A1 WO2011023135 A1 WO 2011023135A1
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Prior art keywords
state information
channel state
mobile terminal
base stations
channel
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PCT/CN2010/076441
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English (en)
French (fr)
Inventor
张弓
龙毅
何诚
程勇
刘坚能
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华为技术有限公司
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Application filed by 华为技术有限公司 filed Critical 华为技术有限公司
Priority to BRPI1011932A priority Critical patent/BRPI1011932B8/pt
Priority to EP10811295.4A priority patent/EP2456087B1/en
Publication of WO2011023135A1 publication Critical patent/WO2011023135A1/zh
Priority to US13/339,059 priority patent/US8750150B2/en

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Classifications

    • 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
    • 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
    • H04B7/0658—Feedback reduction
    • H04B7/066—Combined feedback for a number of channels, e.g. over several subcarriers like in orthogonal frequency division multiplexing [OFDM]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/0413—MIMO systems
    • H04B7/0417—Feedback systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
    • H04B7/0615—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal
    • H04B7/0619—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal using feedback from receiving side
    • H04B7/0636—Feedback format
    • H04B7/0639—Using selective indices, e.g. of a codebook, e.g. pre-distortion matrix index [PMI] or for beam selection

Definitions

  • the present invention relates to the field of communications, and in particular, to a method, an apparatus, and a system for transmitting channel state information.
  • a base station In a multiple-input multiple-output (MIMO) system, a base station (BS) needs to obtain channel state information (CSI) from a mobile station (MS) according to the CSI.
  • the information communicates with the MS using space division multiple access technology. Due to the limitation of the number of bits to be encoded, it is difficult for the MS to transmit perfect CSI information to the BS. In order to enable the BS to acquire CSI information, the MS transmits limited CSI information to the BS in a manner that quantizes the perfect CSI information.
  • a codebook for quantizing CSI information of a channel between a BS and an MS is preset, and the MS uses the codebook to quantize CSI information, and sends the quantized CSI information.
  • the MS uses the codebook to quantize CSI information, and sends the quantized CSI information.
  • the inventors have found that in a cooperative MIMO system, the number of cooperative BSs is dynamically changed according to the MS location change, and thus it is not possible to set a cooperative MIMO system for cooperation between the cooperative BS and the MS in advance.
  • the CSI information of the inter-channel performs a quantized codebook, thereby causing the MS to fail to transmit CSI information to the cooperative BS.
  • Embodiments of the present invention provide a method, apparatus, and system for transmitting channel state information capable of transmitting channel state information in a cooperative MIMO system.
  • the embodiment of the present invention adopts the following technical solutions:
  • a method for transmitting channel state information includes: acquiring a mobile terminal and two or more cooperative base stations Between the channel state information and the single-cell codebook between the mobile terminal and each of the two or more cooperative base stations, the channel state information is separately quantized to obtain the quantized And a joint codeword index of the channel state information in the single cell codebook; and a joint codeword index of the quantized channel state information in the single cell codebook.
  • a method for transmitting channel state information includes: acquiring an association codeword index of channel state information between a mobile terminal and two or more cooperating base stations in a single cell codebook, where the single cell codebook is the mobile a single-cell codebook corresponding to each of the two or more coordinated base stations; searching for a codeword in the single-cell codebook according to the joint codeword index, acquiring the mobile terminal and collaborating with two or more Channel state information between base stations.
  • a mobile terminal includes:
  • a first acquiring unit configured to acquire channel state information between the mobile terminal and two or more cooperative base stations
  • a second acquiring unit configured to separately perform channel state information acquired by the first acquiring unit according to a preset single-cell codebook between the mobile terminal and each of the two or more coordinated base stations Quantizing, obtaining a joint codeword index of the quantized channel state information in the single cell codebook;
  • a sending unit configured to send a joint codeword index of the quantized channel state information acquired by the second acquiring unit in the single cell codebook.
  • a base station comprising:
  • a first acquiring unit configured to acquire a joint codeword index of the channel state information between the mobile terminal and the two or more coordinated base stations in the single-cell codebook, where the single-cell codebook is the mobile terminal and the a single-cell codebook corresponding to each of two or more cooperative base stations;
  • a second acquiring unit configured to search for a codeword in the single-cell codebook according to the joint codeword index acquired by the first acquiring unit, and acquire channel state information between the mobile terminal and two or more coordinated base stations.
  • a communication system comprising: a mobile terminal, configured to acquire channel state information between two or more cooperative base stations, according to a preset single cell codebook between each of the two or more coordinated base stations And respectively, the channel state information is quantized, the joint codeword index of the quantized channel state information in the single cell codebook is obtained, and the joint codeword index is sent to the cooperative base station; Referring to the joint codeword index sent by the mobile terminal, searching for the codeword in the single-cell codebook according to the joint codeword index, and acquiring channel state information.
  • the method, device, and system for transmitting channel state information provided by the embodiments of the present invention can separately quantize channel state information according to a single-cell codebook between a mobile terminal and a base station between each of two or more coordinated base stations.
  • the purpose of transmitting channel state information in the output system solves the problem that the prior art cannot set a codebook for the cooperative multiple input multiple output system due to the change of the number of cooperative base stations, thereby causing the problem that channel state information cannot be transmitted in the cooperative multiple input multiple output system;
  • the embodiment of the present invention uses the single-cell codebook to quantize the channel state information between the mobile terminal and the two or more coordinated base stations, so that the technical solution provided by the embodiment of the present invention is more flexible and scalable.
  • FIG. 1 is a flowchart of a method for transmitting channel state information according to an embodiment of the present invention
  • FIG. 2 is a flowchart of a method for transmitting channel state information according to another embodiment of the present invention
  • FIG. 3 is a channel according to another embodiment of the present invention
  • FIG. 4 is a flowchart of a method for transmitting channel state information according to still another embodiment of the invention shown in FIG.
  • FIG. 5 is a schematic structural diagram of a mobile terminal according to an embodiment of the present invention
  • FIG. 6 is a schematic structural diagram of a first acquiring unit in a mobile terminal according to an embodiment of the present invention shown in FIG.
  • FIG. 8 is a schematic structural diagram of a base station according to an embodiment of the present invention
  • FIG. 9 is a schematic structural diagram of a communication system according to an embodiment of the present invention.
  • a method for transmitting channel state information includes: Step 101: Acquire CSI information between an MS and two or more cooperative BSs; Step 102, according to preset MSs and two or more a single-cell codebook between each BS in the cooperative BS, and respectively quantizing the CSI information acquired in step 101, and obtaining a joint codeword index of the quantized CSI information in the single-cell codebook; Step 103, sending step 102 The joint codeword index of the obtained quantized CSI information in the single cell codebook.
  • the method for transmitting channel state information can separately quantize CSI information according to a single-cell codebook between a preset MS and each of two or more coordinated BSs, and quantize the CSI.
  • the joint codeword index of the information in the single-cell codebook is sent to the base station, thereby achieving the purpose of transmitting CSI information in the cooperative MIMO system, and solving the problem that the prior art cannot set the codebook for the cooperative MIMO system due to the change of the number of cooperative BSs.
  • the embodiment of the present invention uses the single-cell codebook to separately quantize the CSI information between the MS and the two or more cooperative BSs, so the technical solution provided by the embodiment of the present invention is flexible and scalable. More sexual.
  • another embodiment of the present invention further provides a method for transmitting channel state information, including:
  • Step 201 Acquire an joint codeword index of the CSI information between the MS and the two or more coordinated BSs in the single-cell codebook, where the single-cell codebook is the MS corresponding to each of the two or more coordinated BSs.
  • Single cell codebook
  • Step 202 Search for the codeword in the single-cell codebook according to the joint codeword index obtained in step 201, and obtain CSI information between the MS and the two or more cooperative BSs.
  • the method for transmitting channel state information can obtain the joint codeword index of the CSI information between the MS and the two or more coordinated BSs in the single cell codebook, and search for the single cell code according to the joint codeword index.
  • the CSI information between the MS and the two or more cooperating BSs is obtained, so that the problem that the prior art cannot set a codebook for the cooperative MIMO system due to the change of the number of cooperative BSs is solved, and the CSI information is transmitted in the cooperative MIMO system. purpose.
  • the cooperative MIMO system includes N (N is an integer greater than or equal to 2) mutually cooperating BSs, and the N cooperative BSs simultaneously serve K (K is a natural number) MSs. , when the kth ( k [l, K] ) MSs need to feed back to N cooperating BSs
  • the CSI information is a method for transmitting channel state information according to another embodiment of the present invention, include:
  • Step 301 The MS acquires CSI information between the N cooperative BSs.
  • step 301 can include:
  • Step 401 the aggregated channel matrix H k and a channel between the MS acquires the BS N cooperative loss G k.
  • the MS can also detect the channel loss G k according to the measurement information sent by the N cooperating BSs, where G k is composed of the path loss and the log-normal shadow effect, and eR + x is a diagonal matrix,
  • Step 403 The MS obtains CSI information between the MS and the N cooperating BSs according to the normalized aggregated channel matrix/f ⁇ , where the CSI information is specifically the MS and the N cooperative BSs.
  • the row space basis of the normalized aggregated channel matrix ⁇ ) is specifically the MS and the N cooperative BSs.
  • the orthogonal basis is simplified as V.
  • Step 302 The MS separately quantizes the CSI information according to the preset single-cell codebook between each of the N mutually cooperating BSs, and obtains the joint codeword of the quantized CSI information in the single-cell codebook. index.
  • the single-cell codebook is ⁇ , ⁇ , % V , where excreted e[l,N] ) is the kth MS and the first
  • Single-cell codebook between n BSs, ⁇ has a size of 2 ⁇ , and is MS inverse
  • all single-cell codebooks can be designed to be the same size.
  • the MS uses the single-cell codebook to quantize the CSI information, and obtains the joint codeword index of the quantized CSI information in the single-cell codebook, including:
  • the MS uses the codewords of the single cell codebooks corresponding to the BSs, ⁇ , ..., % ⁇ , respectively, for the normalized between the MS obtained in step 301 and the mutually cooperating BSs.
  • the row space basis of the aggregated channel matrix ⁇ ⁇ ) is quantized;
  • the MS obtains the quantized joint codeword index in the single-cell codebook 1 , %, 2 , , ⁇ ⁇ according to the following formula ( 2 ):
  • Step 303 The MS sends the joint codeword index of the quantized CSI information in the single cell codebook to the mutually cooperating BSs.
  • the MS sends a joint codeword index corresponding to each of the BSs. For example, the MS sends a joint codeword index corresponding to the first BS to the first BS.
  • the second BS sends the joint codeword index 2 corresponding thereto, and so on, and sends the joint codeword index N corresponding thereto to the Nth BS;
  • the MS When the BSC is deployed on a certain BS, if deployed on the first BS, the MS sends all joint codeword indexes [JK 2 , . . . , J ] corresponding to the N mutually cooperative BSs to the BS.
  • This embodiment is described by taking the BSC deployment on a certain BS as an example.
  • Step 304 The BS receives the joint codeword index of the CSI information fed back by the MS in the single cell codebook.
  • the BSC is deployed on the first BS, and the BS receives all the joint codeword indexes sent by the MS, ..., ].
  • Step 305 The BS searches for a codeword in the single-cell codebook according to the joint codeword index, and obtains CSI information between the MS and the N mutually cooperating BSs, where the CSI information is specifically an MS and N cooperative BSs.
  • the BS may query the single-cell codebooks ⁇ ⁇ , ⁇ 3 ⁇ 4, 2 , . . . , ⁇ ⁇ according to the joint codeword index [J , J , . . . , ⁇ ] to obtain the MS and the mutually cooperating BS.
  • the BS may communicate with the MS according to the CSI information. As shown in FIG. 3, it may also include:
  • Step 306 The BS acquires an aggregate channel matrix between the MS and the N cooperative BSs according to the CSI information ⁇ ⁇ ) and the pre-acquired channel loss.
  • Step 307 The BS communicates with the MS according to the aggregated channel matrix, including:
  • the BS When the BS needs to communicate with the kth MS, the BS acquires the aggregate channel matrix of other MSs except the kth MS! ⁇ ⁇ , ⁇ ... ⁇ ! ⁇ ..., ! ⁇ ;
  • the BS performs SVD decomposition on the above H to obtain null space Null (H) of other MSs other than the kth MS;
  • the step 305 further includes: the BS sending the CSI information fed back by the MS to the BSC in the joint codebook, in step 306,
  • the BSC searches for the codeword in the joint codebook according to the joint codeword index, acquires CSI information between the MS and the N mutually cooperating BSs, and sends the CSI information to the BS.
  • the method for transmitting channel state information provided by the embodiment of the present invention can be respectively performed between the MS and the N cooperative BSs according to a single-cell codebook between each of the MSs and the N mutually cooperating BSs.
  • the CSI information is quantized, and the joint codeword index of the quantized CSI information in the single-cell codebook is sent to the BS, and the BS obtains the channel state information by searching the single-cell codebook according to the joint codeword index, thereby achieving the cooperative MIMO system.
  • the purpose of the CSI information is transmitted; since the CSI information is obtained according to the aggregated channel matrix quantized by the channel loss, the technical solution provided by the embodiment of the present invention removes the influence of the channel loss between the MS and the different BS on the transmitted CSI information.
  • the technical solution provided by the embodiment of the present invention is more flexible and scalable.
  • an embodiment of the present invention further provides a mobile terminal, including:
  • the first acquiring unit 501 is configured to acquire channel state information between the mobile terminal and two or more cooperative base stations;
  • a second acquiring unit 502 configured to separately acquire, according to a preset single channel codebook between the mobile terminal and each of the two or more coordinated base stations, a channel state acquired by the first acquiring unit 501 The information is quantized, and the joint codeword index of the quantized channel state information in the single cell codebook is obtained;
  • the sending unit 503 is configured to send the joint codeword index of the quantized channel state information acquired by the second acquiring unit 502 in the single cell codebook.
  • the first acquiring unit 501 may include:
  • a first obtaining subunit 5011 configured to acquire an aggregated channel matrix and a channel loss between the mobile terminal and the two or more coordinated base stations
  • the normalization subunit 5012 is configured to perform normalization processing on the aggregated channel matrix by using a channel loss acquired by the first obtaining subunit 5011, to obtain a normalized aggregated channel matrix;
  • the second obtaining subunit 5013 is configured to acquire channel state information between the mobile terminal and the two or more cooperative base stations according to the normalized aggregate channel matrix acquired by the normalization subunit 5012.
  • the normalized aggregate channel matrix acquired by the normalization subunit 5012. For the specific implementation method of the mobile terminal provided by the embodiment of the present invention, reference may be made to the method for transmitting channel state information provided by the embodiment of the present invention, and details are not described herein again.
  • the mobile terminal provided by the embodiment of the present invention can obtain the joint codebook between the N and the mutually cooperating BSs according to the preset single-cell codebook, and use the joint codebook to perform CSI information. Quantizing, transmitting the joint codeword index of the quantized CSI information in the joint codebook to the BS, thereby achieving the purpose of transmitting CSI information in the cooperative MIMO system; since the CSI information is the aggregated channel quantized according to the used channel loss Obtained by the matrix, the technical solution provided by the embodiment of the present invention removes the influence of the channel loss between the MS and the different BSs on the transmission CSI information.
  • the prior art has different channel loss between the MS and different BSs due to the change of the number of cooperative BSs.
  • the embodiment of the present invention uses the single-cell codebook to separately perform the CSI information between the MS and the two or more cooperative BSs. Quantification, so the technical solution provided by the embodiment of the present invention is more flexible and scalable.
  • an embodiment of the present invention further provides a base station, including:
  • the first acquiring unit 701 is configured to obtain a joint codeword index of the channel state information between the mobile terminal and the two or more coordinated base stations in the single-cell codebook, where the single-cell codebook is the mobile terminal and the a single-cell codebook corresponding to each of the two or more coordinated base stations;
  • the second obtaining unit 702 is configured to search for a codeword in the single-cell codebook according to the joint codeword index acquired by the first acquiring unit 701, and obtain a channel state between the mobile terminal and two or more coordinated base stations. information.
  • the base station may further include:
  • a third acquiring unit 703, configured to acquire channel state information according to the second acquiring unit 702 ⁇ ( ⁇ )
  • a pre-acquired channel loss acquiring an aggregated channel matrix between the mobile terminal and the two or more cooperative base stations.
  • the communication unit 704 is configured to communicate with the mobile terminal according to the aggregated channel matrix acquired by the third acquiring unit 703.
  • the base station provided by the embodiment of the present invention is capable of acquiring the joint codeword index of the CSI information between the MS and the two or more cooperative BSs in the joint codebook, and searching for the joint codebook according to the joint codeword index, acquiring the MS and the two
  • the CSI information between the cooperative BSs is composed of a single-cell codebook. Therefore, the problem that the prior art cannot set a codebook for the cooperative MIMO system due to the change of the number of cooperative BSs is solved, and the cooperative MIMO is achieved.
  • an embodiment of the present invention further provides a communication system, including:
  • the mobile terminal 901 is configured to acquire channel state information between the two or more cooperative base stations 802, according to a preset single-cell codebook and each of the two or more cooperative base stations 902, respectively.
  • the channel state information is quantized, and the joint codeword index of the quantized channel state information in the single cell codebook is obtained, and the joint codeword index is sent to the cooperative base station 902;
  • the cooperative base station 902 is configured to receive a joint codeword index sent by the mobile terminal 901, and search for a codeword in the single-cell codebook according to the joint codeword index to obtain channel state information.
  • the communication system provided by the embodiment of the present invention can be based on two preset mobile terminals and two or more a single-cell codebook between each base station in the coordinated base station, respectively quantizing the channel state information, and transmitting the combined codeword information in the single-cell codebook to the base station, and the base station can
  • the joint codeword index finds the joint codebook to obtain channel state information, thereby achieving the purpose of transmitting channel state information in the cooperative multiple input multiple output system, and solves the problem that the prior art cannot be set for the cooperative multiple input multiple output system due to the change of the number of cooperative base stations.
  • Embodiments of the present invention provide a method, an apparatus, and a system for transmitting channel state information that can be applied in collaboration.
  • CSI information transmission is implemented in a cooperative MIMO system.
  • a person skilled in the art can understand that all or part of the steps of implementing the above embodiments can be completed by a program to instruct related hardware, and the program can be stored in a computer readable storage medium, such as ROM/RAM, magnetic. Disc or CD.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
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Description

信道状态信息的传输方法、 装置和系统 技术领域
本发明涉及通信领域， 尤其涉及一种信道状态信息的传输方法、装置和系 统。
背景技术
在多输入多输出 （ Multiple-input Multiple-output, MIMO ) 系统中， 基站 ( Basic Station, BS )需要从移动终端（ Mobile Station, MS )获取信道状态信 息 ( channel state information, CSI ), 根据该 CSI信息釆用空分多址技术与 MS 进行通信。 由于受编码比特位数的限制， MS难以向 BS传输完善的 CSI信息。 为了 使 BS能够获取 CSI信息， MS釆用对完善的 CSI信息进行量化的方式， 向 BS 传输有限的 CSI信息。 具体地， 在单小区 MIMO系统中， 预先设置用于对 BS 和 MS之间信道的 CSI信息进行量化的码本， MS釆用该码本对 CSI信息进行 量化， 并将量化后的 CSI信息发送给 BS。
在实现本发明的过程中， 发明人发现， 在协作 MIMO系统中， 协作 BS的数 量是 ^^据 MS位置变化而动态变化的， 因此无法预先为协作 MIMO系统设置用 于对协作 BS和 MS之间信道的 CSI信息进行量化的码本， 从而导致 MS无法向协 作 BS传输 CSI信息。
发明内容
本发明的实施例提供一种信道状态信息的传输方法、装置和系统， 能够在 协作 MIMO系统中传输信道状态信息。 本发明的实施例采用如下技术方案： 一种信道状态信息的传输方法， 包括： 获取移动终端与两个以上协作基站 之间的信道状态信息；根据预先设置的所述移动终端与所述两个以上协作基站 中的每个基站之间的单小区码本， 分别对所述信道状态信息进行量化， 获取量 化后的信道状态信息在所述单小区码本中的联合码字索引；发送所述量化后的 信道状态信息在所述单小区码本中的联合码字索引。
一种信道状态信息的传输方法， 包括： 获取移动终端与两个以上协作基站 之间的信道状态信息在单小区码本中的联合码字索引， 其中， 所述单小区码本 为所述移动终端与所述两个以上协作基站中的每个基站对应的单小区码本；根 据所述联合码字索引查找所述单小区码本中的码字，获取所述移动终端与两个 以上协作基站之间的信道状态信息。
一种移动终端， 包括：
第一获取单元，用于获取移动终端与两个以上协作基站之间的信道状态信 息；
第二获取单元，用于根据预先设置的所述移动终端与所述两个以上协作基 站中的每个基站之间的单小区码本，分别对所述第一获取单元获取的信道状态 信息进行量化，获取量化后的信道状态信息在所述单小区码本中的联合码字索 引；
发送单元，用于发送所述第二获取单元获取的量化后的信道状态信息在所 述单小区码本中的联合码字索引。
一种基站， 包括：
第一获取单元，用于获取移动终端与两个以上协作基站之间的信道状态信 息在单小区码本中的联合码字索引， 其中， 所述单小区码本为所述移动终端与 所述两个以上协作基站中的每个基站对应的单小区码本； 第二获取单元，用于根据所述第一获取单元获取的联合码字索引查找所述 单小区码本中的码字，获取所述移动终端与两个以上协作基站之间的信道状态 信息。 一种通信系统， 包括： 移动终端， 用于获取与两个以上协作基站之间的信道状态信息，根据预先 设置的与所述两个以上协作基站中的每个基站之间的单小区码本，分别对所述 信道状态信息进行量化，获取量化后的信道状态信息在所述单小区码本中的联 合码字索引， 向协作基站发送所述联合码字索引； 协作基站， 用于接收所述移动终端发送的联合码字索引，根据所述联合码 字索引查找所述单小区码本中的码字， 获取信道状态信息。 本发明实施例提供的信道状态信息的传输方法、 装置和系统， 能够根据预先设 置的移动终端与两个以上协作基站中的每个基站之间的单小区码本，分别对信 道状态信息进行量化，将量化后的信道状态信息在单小区码本中的联合码字索 引发送给基站，基站能够根据所述联合码字索引查找单小区码本获取信道状态 信息，从而达到了在协作多输入多输出系统中传输信道状态信息的目的，解决 了现有技术由于协作基站数量变化无法为协作多输入多输出系统设置码本，从 而导致无法在协作多输入多输出系统中传输信道状态信息的问题；由于本发明 实施例釆用单小区码本分别对移动终端与两个以上协作基站之间的信道状态 信息进行量化， 所以本发明实施例提供的技术方案灵活性和可扩展性更强。 附图说明
图 1为本发明实施例提供的信道状态信息的传输方法流程图； 图 2为本发明另一实施例提供的信道状态信息的传输方法流程图； 图 3为本发明又一实施例提供的信道状态信息的传输方法流程图； 图 4为图 3所示的发明又一实施例提供的信道状态信息的传输方法中步驟 301的流程图； 图 5为本发明实施例提供的移动终端结构示意图； 图 6为图 5所示的本发明实施例提供的移动终端中第一获取单元的结构示 意图； 图 7为本发明实施例提供的基站结构示意图一； 图 8为本发明实施例提供的基站结构示意图二； 图 9为本发明实施例提供的通信系统结构示意图。
具体实施方式
为了解决现有技术难以在协作 MIMO系统中传输 CSI信息的问题， 本发 明实施例提供一种信道状态信息的传输方法、 装置和系统。 如图 1所示， 本发明实施例提供的信道状态信息的传输方法， 包括： 步骤 101 , 获取 MS与两个以上协作 BS之间的 CSI信息； 步骤 102, 根据预先设置的 MS与两个以上协作 BS中的每个 BS之间的 单小区码本， 分别对步骤 101 获取的 CSI信息进行量化， 获取量化后的 CSI 信息在单小区码本中的联合码字索引； 步骤 103 , 发送步骤 102获取的量化后的 CSI信息在单小区码本中的联合 码字索引。 本发明实施例提供的信道状态信息的传输方法， 能够根据预先设置的 MS 与两个以上协作 BS中的每个 BS之间的单小区码本， 分别对 CSI信息进行量 化，将量化后的 CSI信息在单小区码本中的联合码字索引发送给基站，从而达 到了在协作 MIMO系统中传输 CSI信息的目的，解决了现有技术由于协作 BS 数量变化， 无法为协作 MIMO系统设置码本， 从而导致无法在协作 MIMO系 统中传输 CSI信息的问题；由于本发明实施例釆用单小区码本分别对 MS与两 个以上协作 BS之间的 CSI信息进行量化， 所以本发明实施例提供的技术方案 灵活性和可扩展性更强。
如图 2所示， 本发明另一实施例还提供一种信道状态信息的传输方法， 包 括：
步骤 201 , 获取 MS与两个以上协作 BS之间的 CSI信息在单小区码本中 的联合码字索引， 其中， 所述单小区码本为 MS与两个以上协作 BS中的每个 BS对应的单小区码本；
步骤 202, 根据步骤 201获取的联合码字索引查找单小区码本中的码字， 获取 MS与两个以上协作 BS之间的 CSI信息。
本发明实施例提供的信道状态信息的传输方法，能够获取 MS与两个以上 协作 BS之间的 CSI信息在单小区码本中的联合码字索引， 并根据该联合码字 索引查找单小区码本， 获取 MS与两个以上协作 BS之间的 CSI信息， 所以解 决了现有技术由于协作 BS数量变化，无法为协作 MIMO系统设置码本的问题， 达到了在协作 MIMO系统中传输 CSI信息的目的。
为了使本领域技术人员能够更清楚地理解本发明实施例提供的技术方案， 下面通过具体的实施例对本发明实施例提供的信道状态信息的传输方法进行 详细说明。
在本发明提供的又一实施例中，协作 MIMO系统包括 N ( N为大于等于 2 的整数） 个相互协作的 BS, 该 N个相互协作的 BS同时为 K ( K为自然数） 个 MS提供服务， 当第 k ( k [l,K] ) 个 MS需要向 N个相互协作的 BS反馈
CSI信息时，如图 3所示，本发明又一实施例提供的信道状态信息的传输方法， 包括：
步驟 301 , MS获取与 N个相互协作的 BS之间的 CSI信息。
如图 4所示， 步驟 301可以包括：
步骤 401 , MS获取与 N个相互协作的 BS之间的聚合信道矩阵 Hk和信道 损耗 Gk。
在本实施例中， MS可以接收 N个相互协作的 BS发送的测量信息， 根据 该测量信息对 MS与 N个相互协作的 BS之间的信道进行估计，获取聚合信道 矩阵 ¾=[¾ ¾,2, ...... , Hk,N], Hk,n为第 k个 MS与第 n个 BS之间的信道 矩阵， HknsCnR ， « 为第 k个 MS的天线个数， 为第 n个 BS的天线个数， ne[l,N];
同理， MS也可以根据 N个相互协作的 BS发送的测量信息检测出信道损 耗 Gk, 其中， Gk由路径损耗 和对数正态的阴影效应 组成， eR+ x 为 对 角 阵 ， 对 角 线 元 素 表 示 大 尺 度 衰 落 ， Gk = diag([^gklskl^gk2sk2 , - - ;^g NskN ]) , "e[l,N]。
步骤 402, MS采用信道损耗 Gk对聚合信道矩阵 Hk进行归一化处理， 获 取归一化后的聚合信道矩阵 ^ = HkG~l。
步骤 403， MS根据所述归一化后的聚合信道矩阵 /f^获取 MS与 N个相 互协作的 BS之间的 CSI信息， 其中， 所述 CSI信息具体为 MS与 N个相互协 作的 BS之间的归一化后的聚合信道矩阵 ω)的行空间基。
在本实施例中， MS 可以根据如下公式 （ 1 )对归一化后的聚合信道矩阵 进行奇异值 （SVD)分解， 获取归一化后的聚合信道矩阵 ^ ^的行空间 基： nn sm = [ O — ^[^' 亇 ^s v r ( i ) 其中， y )和 分别为归一化后的聚合信道矩阵 Ηω、的正交基（行空 间基） 和零空间， 为了简便将 的正交基 简化表示为 V 。 步骤 302, MS根据预先设置的与 N个相互协作的 BS中每个 BS之间的单 小区码本，分别对 CSI信息进行量化，获取量化后的 CSI信息在单小区码本中 的联合码字索引。
单小区码本为 ζ^, ^···, % V, 其中， „ e[l,N] )为第 k个 MS与第
N
n个 BS之间的单小区码本， ^^的大小为 2 ^， 且 为 MS反
' n=\ '
馈 CSI信息的比特数。 进一步地， 在本实施例中， 可以将所有单小区码本设计 为相同大小。
MS采用单小区码本对 CSI信息进行量化， 获取量化后的 CSI信息在单小 区码本中的联合码字索引， 包括：
1、 MS釆用 Ν个 BS对应的单小区码本 ^^^，…，％^中的码字， 分别对 步骤 301中获得的 MS与 Ν个相互协作的 BS之间的归一化后的聚合信道矩阵 ΗΙω)的行空间基 进行量化；
2、 MS根据如下公式（ 2 )获取量化后的 在单小区码本 1,%,2, ， φΝ 中的联合码字索引：
[44，···,】 ]=
Figure imgf000009_0001
(2) 其中， ^ k^U！^，，^k，2，,…，, k，^N,二^ ^^V^L J^k:1 ¼ J+k，2 ·..¼ J+k，N Γ」 ， k,n为第 ^ k个 MS 与第 n个 BS之间的单小区码本 中第 Jk,„个码字； dc{.)为 (Jw,Jk,2，. · · Ν)与 之间的弦距离。
步骤 303 , MS向 Ν个相互协作的 BS发送量化后的 CSI信息在单小区码 本中的联合码字索引。
当基站控制器（ Base Station Controller, BSC )独立部署时， MS分别向每 个 BS发送与其对应的联合码字索引， 例如： MS向第 1个 BS发送与其对应 的联合码字索引 J^， 向第 2个 BS发送与其对应的联合码字索引 2， 以此类 推， 向第 N个 BS发送与其对应的联合码字索引 N ;
当 BSC部署在某个 BS上时，如部署在第 1个 BS上， MS向该 BS发送 N 个相互协作的 BS对应的所有联合码字索引 [JK2，. .., J ]。 本实施例以 BSC 部署在某个 BS上为例进行说明。
步骤 304, BS接收 MS反馈的 CSI信息在单小区码本中的联合码字索引。 在本实施例中， BSC部署在第 1个 BS上， 该 BS接收 MS发送的所有联 合码字索引 ，…， ]。
步骤 305 , BS根据联合码字索引查找单小区码本中的码字，获取 MS与 N 个相互协作的 BS之间的 CSI信息， 其中， 所述 CSI信息具体为 MS与 N个相 互协作的 BS之间的归一化后的聚合信道矩阵/ 的行空间基。
在本实施例中， BS可以根据联合码字索引 [J ,J ，…， ，Ν]查询单小区码本 φ χ , ζ¾,2 ,…， φ Ν , 获取 MS与 Ν个相互协作的 BS之间的归一化后的聚合信道 矩阵^ 的行空间基 ?) 。
Figure imgf000010_0001
可选地， 当 BS获取 CSI信息以后，可以根据该 CSI信息与 MS进行通信， 如图 3所示， 还可以包括：
步骤 306， BS根据 CSI信息 Ϋίω)以及预先获取的信道损耗 ， 获取 MS 与 N个相互协作的 BS之间的聚合信道矩阵 ίϊκ
Figure imgf000011_0001
步骤 307， BS根据聚合信道矩阵与 MS进行通信， 包括：
1、 当 BS需要与第 k个 MS进行通信时， BS获取除第 k个 MS以外的其 他 MS的聚合信道矩阵！^ ^， ^…^！^ …， !^；
2、 BS对上述 H进行 SVD分解， 获取第 k个 MS以外的其他 MS的零空 间 Null ( H );
3、 根据上述零空间 Null ( H ) 获得第 k个 MS的编码矩阵， 采用该编码 矩阵对与该 MS之间传输的信息进行编码并发送。
值得说明的是， 在本实施例中， 当 BSC独立部署时， 步骤 305之后还包 括： BS将 MS反馈的 CSI信息在联合码本中的联合码字索引发送给 BSC， 则 在步骤 306 中， 由 BSC根据联合码字索引查找联合码本中的码字， 获取 MS 与 N个相互协作的 BS之间的 CSI信息， 并将该 CSI信息发送给 BS。
本发明实施例提供的信道状态信息的传输方法， 能够根据预先设置的 MS 与 N个相互协作的 BS中每个 BS之间的单小区码本， 分别对 MS与 N个相互 协作的 BS之间的 CSI信息进行量化，将量化后的 CSI信息在单小区码本中的 联合码字索引发送给 BS， BS根据联合码字索引查找单小区码本获取信道状态 信息， 从而达到了在协作 MIMO系统中传输 CSI信息的目的； 由于 CSI信息 是根据釆用信道损耗量化后的聚合信道矩阵获得的，所以本发明实施例提供的 技术方案去除了 MS与不同 BS之间信道损耗对传输 CSI信息的影响； 解决了 现有技术由于协作 BS数量变化， MS与不同 BS之间信道损耗不同无法为协 作多 MIMO系统设置码本， 从而导致无法在协作 MIMO系统中传输 CSI信息 的问题； 由于本发明实施例釆用单小区码本分别对 MS与 N个相互协作的 BS 之间的 CSI信息进行量化，所以本发明实施例提供的技术方案灵活性和可扩展 性更强。
如图 5所示， 本发明实施例还提供一种移动终端， 包括：
第一获取单元 501 , 用于获取移动终端与两个以上协作基站之间的信道状 态信息；
第二获取单元 502, 用于根据预先设置的所述移动终端与所述两个以上协 作基站中的每个基站之间的单小区码本，分别对所述第一获取单元 501获取的 信道状态信息进行量化，获取量化后的信道状态信息在所述单小区码本中的联 合码字索引；
发送单元 503 , 用于发送所述第二获取单元 502获取的量化后的信道状态 信息在所述单小区码本中的联合码字索引。
进一步地， 如图 6所示， 所述第一获取单元 501可以包括：
第一获取子单元 5011 , 用于获取所述移动终端与所述两个以上协作基站 之间的聚合信道矩阵和信道损耗；
归一化子单元 5012, 用于采用所述第一获取子单元 5011获取的信道损耗 对所述聚合信道矩阵进行归一化处理， 获取归一化后的聚合信道矩阵；
第二获取子单元 5013 , 用于根据所述归一化子单元 5012获取的归一化后 的聚合信道矩阵，获取所述移动终端与所述两个以上协作基站之间的信道状态 信息。 本发明实施例提供的移动终端的具体实现方法可以参见本发明实施例提 供的信道状态信息的传输方法所述， 此处不再赘述。
本发明实施例提供的移动终端， 能够根据预先设置的与单个 BS之间的单 小区码本， 获取与 N个相互协作的 BS之间的联合码本， 并采用该联合码本对 CSI信息进行量化，将量化后的 CSI信息在联合码本中的联合码字索引发送给 BS, 从而达到了在协作 MIMO系统中传输 CSI信息的目的； 由于 CSI信息是 根据釆用信道损耗量化后的聚合信道矩阵获得的，所以本发明实施例提供的技 术方案去除了 MS与不同 BS之间信道损耗对传输 CSI信息的影响； 解决了现 有技术由于协作 BS数量变化， MS与不同 BS之间信道损耗不同无法为协作 多 MIMO系统设置码本， 从而导致无法在协作 MIMO系统中传输 CSI信息的 问题； 由于本发明实施例釆用单小区码本分别对 MS与两个以上协作 BS之间 的 CSI信息进行量化，所以本发明实施例提供的技术方案灵活性和可扩展性更 强。
如图 7所示， 本发明实施例还提供一种基站， 包括：
第一获取单元 701 , 用于获取移动终端与两个以上协作基站之间的信道状 态信息在单小区码本中的联合码字索引， 其中， 所述单小区码本为所述移动终 端与所述两个以上协作基站中的每个基站对应的单小区码本；
第二获取单元 702, 用于根据所述第一获取单元 701获取的联合码字索引 查找所述单小区码本中的码字，获取所述移动终端与两个以上协作基站之间的 信道状态信息。
进一步地， 如图 8所示， 所述基站还可以包括：
第三获取单元 703 , 用于根据所述第二获取单元 702获取的信道状态信息 ΐ(ω)
97以及预先获取的信道损耗 , 获取所述移动终端与所述两个以上协作基站 之间的聚合信道矩阵 ίϊκ
Figure imgf000014_0001
通信单元 704, 用于根据所述第三获取单元 703获取的聚合信道矩阵与所 述移动终端进行通信。
本发明实施例提供的基站具体实现方法可以参见本发明实施例提供的信 道状态信息的传输方法所述， 此处不作贅述。
本发明实施例提供的基站， 能够获取 MS与两个以上协作 BS之间的 CSI 信息在联合码本中的联合码字索引， 并根据该联合码字索引查找联合码本， 获 取 MS与两个以上协作 BS之间的 CSI信息， 由于联合码本是由单小区码本组 成的， 所以解决了现有技术由于协作 BS数量变化，无法为协作 MIMO系统设 置码本的问题， 达到了在协作 MIMO系统中传输 CSI信息的目的。
如图 9所示， 本发明实施例还提供一种通信系统， 包括：
移动终端 901 , 用于获取与两个以上协作基站 802之间的信道状态信息， 根据预先设置的与所述两个以上协作基站 902 中的每个基站之间的单小区码 本， 分别对所述信道状态信息进行量化， 获取量化后的信道状态信息在所述单 小区码本中的联合码字索引， 向协作基站 902发送所述联合码字索引；
协作基站 902, 用于接收所述移动终端 901发送的联合码字索引， 根据所 述联合码字索引查找所述单小区码本中的码字， 获取信道状态信息。
本发明实施例提供的通信系统的具体实现方法可以参见本发明实施例提 供的信道状态信息的传输方法所述， 此处不作贅述。
本发明实施例提供的通信系统，能够根据预先设置的移动终端与两个以上 协作基站中的每个基站之间的单小区码本， 分别对信道状态信息进行量化， 将 量化后的信道状态信息在单小区码本中的联合码字索引发送给基站，基站能够 根据所述联合码字索引查找联合码本获取信道状态信息，从而达到了在协作多 输入多输出系统中传输信道状态信息的目的，解决了现有技术由于协作基站数 量变化无法为协作多输入多输出系统设置码本，从而导致无法在协作多输入多 输出系统中传输信道状态信息的问题；由于本发明实施例采用单小区码本分别 对移动终端与两个以上协作基站之间的信道状态信息进行量化，所以本发明实 施例提供的技术方案灵活性和可扩展性更强。 本发明实施例提供信道状态信息的传输方法、装置和系统可以应用在协作
MIMO系统中， 实现在协作 MIMO系统中进行 CSI信息传输。 本领域普通技术人员可以理解实现上述实施例方法中的全部或部分步骤 是可以通过程序来指令相关的硬件完成，所述的程序可以存储于一计算机可读 存储介质中， 如 ROM/RAM、 磁碟或光盘等。

Claims

权 利 要 求
1、 一种信道状态信息的传输方法， 其特征在于， 包括：
获取移动终端与两个以上协作基站之间的信道状态信息；
根据所述移动终端与所述两个以上协作基站中的每个基站之间的单小区 码本， 分别对所述信道状态信息进行量化， 获取量化后的信道状态信息在所述 单小区码本中的联合码字索引；
发送所述量化后的信道状态信息在所述单小区码本中的联合码字索引。
2、 根据权利要求 1所述的方法， 其特征在于， 所述获取移动终端与两个 以上协作基站之间的信道状态信息， 包括：
获取所述移动终端与所述两个以上协作基站之间的聚合信道矩阵和信道 损耗；
采用所述信道损耗对所述聚合信道矩阵进行归一化处理，获取归一化后的 聚合信道矩阵；
根据所述归一化后的聚合信道矩阵获取所述移动终端与所述两个以上协 作基站之间的信道状态信息。
3、 根据权利要求 2所述的方法， 其特征在于， 所述信道状态信息为所述 归一化后的聚合信道矩阵进行奇异值分解获得的行空间基；
对所述信道状态信息进行量化为对所述行空间基进行量化。
4、 根据权利要求 1所述的方法， 其特征在于， 所述量化后的信道状态信 息在所述联合码本中的联合码字索引为：
Figure imgf000016_0001
其中， [jK,..., N]为联合码字索引， ν^ω)为所述移动终端与所述两个以 上 协 作 基 站 之 间 的 信 道 状 态 信 息 ； η个
Figure imgf000017_0001
协作基站之间的单小区码本中第 Jk，n个码字； (.)为 ¼( 2，.. ·Λ,Ν)与 之间的弦距离。
5、 一种信道状态信息的传输方法， 其特征在于， 包括：
获取移动终端与两个以上协作基站之间的信道状态信息在单小区码本中 的联合码字索引， 其中， 所述单小区码本为所述移动终端与所述两个以上协作 基站中的每个基站对应的单小区码本；
根据所述联合码字索引查找所述单小区码本中的码字，获取所述移动终端 与两个以上协作基站之间的信道状态信息。
6、 根据权利要求 5所述的方法， 其特征在于， 还包括：
根据所述信道状态信息 以及预先获取的信道损耗 , 获取所述移动 终端与所述两个以上协作基站之间的聚合信道矩阵
Figure imgf000017_0002
根据所述聚合信道矩阵与所述移动终端进行通信。
7、 如权利要求 8所述的方法， 其特征在于， 根据所述聚合信道矩阵与所 述移动终端进行通信包括：
需要与第 k个 MS进行通信时，获取除第 k个移动终端以外的其他移动终 端的聚合信道矩阵 H = [¾, 4 , +1 , ..., ¾^；
对所述 H进行奇异值分解， 获取第 k个移动终端以外的其他移动的零空 间 Null ( H ); 根据所述零空间 Null ( H )获得第 k个 MS的编码矩阵， 釆用该编码矩阵 对与该 MS之间传输的信息进行编码并发送。
8、 一种移动终端， 其特征在于， 包括：
第一获取单元，用于获取移动终端与两个以上协作基站之间的信道状态信 息；
第二获取单元，用于根据所述移动终端与所述两个以上协作基站中的每个 基站之间的单小区码本，分别对所述第一获取单元获取的信道状态信息进行量 化， 获取量化后的信道状态信息在所述单小区码本中的联合码字索引；
发送单元，用于发送所述第二获取单元获取的量化后的信道状态信息在所 述单小区码本中的联合码字索引。
9、 根据权利要求 8所述的移动终端， 其特征在于， 所述第一获取单元包 括：
第一获取子单元，用于获取所述移动终端与所述两个以上协作基站之间的 聚合信道矩阵和信道损耗；
归一化子单元，用于采用所述第一获取子单元获取的信道损耗对所述聚合 信道矩阵进行归一化处理， 获取归一化后的聚合信道矩阵；
第二获取子单元，用于根据所述归一化子单元获取的归一化后的聚合信道 矩阵， 获取所述移动终端与所述两个以上协作基站之间的信道状态信息。
10、 一种基站， 其特征在于， 包括：
第一获取单元，用于获取移动终端与两个以上协作基站之间的信道状态信 息在单小区码本中的联合码字索引， 其中， 所述单小区码本为所述移动终端与 所述两个以上协作基站中的每个基站对应的单小区码本； 第二获取单元，用于根据所述第一获取单元获取的联合码字索引查找所述 单小区码本中的码字，获取所述移动终端与两个以上协作基站之间的信道状态 信息。
11、 根据权利要求 10所述的基站， 其特征在于， 还包括：
第三获取单元， 用于根据所述第二获取单元获取的信道状态信息 以及 预先获取的信道损耗 ， 获取所述移动终端与所述两个以上协作基站之间的 聚合信道矩阵
Figure imgf000019_0001
通信单元，用于根据所述第三获取单元获取的聚合信道矩阵与所述移动终 端进行通信。
12、 一种通信系统， 其特征在于， 包括：
移动终端， 用于获取与两个以上协作基站之间的信道状态信息，根据与所 述两个以上协作基站中的每个基站之间的单小区码本，分别对所述信道状态信 息进行量化， 获取量化后的信道状态信息在所述单小区码本中的联合码字索 引， 向协作基站发送所述联合码字索引；
协作基站， 用于接收所述移动终端发送的联合码字索引，根据所述联合码 字索引查找所述单小区码本中的码字， 获取信道状态信息。
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