WO2013155903A1 - 一种信道状态信息反馈方法及装置 - Google Patents

一种信道状态信息反馈方法及装置 Download PDF

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Publication number
WO2013155903A1
WO2013155903A1 PCT/CN2013/072107 CN2013072107W WO2013155903A1 WO 2013155903 A1 WO2013155903 A1 WO 2013155903A1 CN 2013072107 W CN2013072107 W CN 2013072107W WO 2013155903 A1 WO2013155903 A1 WO 2013155903A1
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Prior art keywords
base station
identifier
csi
coding
harq information
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PCT/CN2013/072107
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English (en)
French (fr)
Inventor
张永平
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华为技术有限公司
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Publication date
Application filed by 华为技术有限公司 filed Critical 华为技术有限公司
Priority to EP13778558.0A priority Critical patent/EP2840731B1/en
Publication of WO2013155903A1 publication Critical patent/WO2013155903A1/zh
Priority to US14/515,984 priority patent/US9900073B2/en

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Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04BTRANSMISSION
    • H04B7/00Radio transmission systems, i.e. using radiation field
    • H04B7/02Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H04B7/0613Diversity 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
    • H04B7/0615Diversity 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
    • H04B7/0619Diversity 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
    • H04B7/0621Feedback content
    • H04B7/0626Channel coefficients, e.g. channel state information [CSI]
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00Arrangements for detecting or preventing errors in the information received
    • H04L1/0001Systems modifying transmission characteristics according to link quality, e.g. power backoff
    • H04L1/0023Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the signalling
    • H04L1/0026Transmission of channel quality indication
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04BTRANSMISSION
    • H04B7/00Radio transmission systems, i.e. using radiation field
    • H04B7/02Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H04B7/0613Diversity 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
    • H04B7/0615Diversity 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
    • H04B7/0619Diversity 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
    • H04B7/0636Feedback format
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00Arrangements for detecting or preventing errors in the information received
    • H04L1/0001Systems modifying transmission characteristics according to link quality, e.g. power backoff
    • H04L1/0023Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the signalling
    • H04L1/0028Formatting
    • H04L1/0029Reduction of the amount of signalling, e.g. retention of useful signalling or differential signalling
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00Arrangements for detecting or preventing errors in the information received
    • H04L1/12Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/18Automatic repetition systems, e.g. Van Duuren systems
    • H04L1/1829Arrangements specially adapted for the receiver end

Definitions

  • the present invention belongs to the field of communications technologies, and in particular, to a channel state information (CSI) feedback method and apparatus.
  • CSI channel state information
  • MIMO Multiple-Input Multiple-Output
  • LTE Long Term Evolution
  • LTE-A Long Term Evolution-Advanced
  • the above wireless communication system further improves the performance of the system by using some advanced MIMO technologies.
  • a base station uses multiple beams formed on an antenna array to serve multiple UEs.
  • the base station needs to obtain the CSI of its downlink channel to each UE, thereby adjusting the beam and scheduling the transmission.
  • the above CSI is fed back by the UE served by the base station through the uplink channel of the base station, and the more accurate the CSI is fed back, the higher the performance of the downlink channel is improved, but this also means that more uplink overhead is needed to feed back these highly accurate CSIs. Therefore, the feedback CSI needs to be compression-coded to reduce the uplink overhead.
  • the prior art transforms CSI from the frequency domain to the time domain for compression coding.
  • the relevant parameters of the coding mode are preset, once set, in a long communication process, even if feedback After the CSI is reconstructed, the distortion is severe, and the downlink performance of the base station is reduced.
  • the accuracy of the feedback CSI is not changed.
  • the feedback overhead caused by the CSI is not changed in the communication process.
  • the uplink channel state of the base station is good and more data can be transmitted, the accuracy of the CSI cannot be increased by improving the feedback overhead, and the downlink performance of the base station is improved.
  • the uplink channel state of the base station is poor, the base station maintains the uplink channel state.
  • the original feedback overhead may exceed the uplink channel load of the base station, causing a large number of errors in the feedback process, and the base station cannot accurately reconstruct the compressed CSI, thereby correspondingly reducing the downlink performance of the base station.
  • the purpose of the embodiments of the present invention is to provide a CSI feedback method, which is intended to enable the accuracy of the CSI fed back by the UE in the MIMO system to be adaptively adjusted according to the downlink performance of the base station and the change of the uplink channel state.
  • a CSI feedback method includes: acquiring an encoding identifier, where the encoding identifier is determined according to at least one of a HARQ information and a current uplink channel state of a base station, where the HARQ information is Obtaining, according to the current data receiving result of the UE, acquiring a coding parameter group corresponding to the coding identifier in a preset plurality of coding parameter groups; compressing the initial CSI according to the coding parameter group, generating compressed CSI, the initial The CSI obtains the current downlink channel acquisition of the base station;
  • Another object of the embodiments of the present invention is to provide a CSI feedback method, including: Obtaining a coding identifier, where the coding identifier is determined according to at least one of a HARQ information and a current uplink channel state of the base station, where the HARQ information is obtained by the UE according to a current data reception result; and the compressed CSI sent by the UE is received;
  • Another object of the present invention is to provide a CSI feedback device, which is located in a UE, and includes: a first coding identifier acquiring unit, configured to acquire a coding identifier, where the coding identifier is based on HARQ information and a current uplink channel state of a base station. Determining, at least one item, that the HARQ information is obtained according to a current data receiving result of the UE;
  • a first encoding parameter group obtaining unit configured to acquire, in a preset plurality of encoding parameter groups, an encoding parameter group corresponding to the encoding identifier
  • a CSI compression unit configured to compress the initial CSI according to the coding parameter group, to generate a compressed CSI, where the initial CSI is obtained by measuring a current downlink channel of the base station;
  • a CSI feedback unit configured to feed back the compressed CSI to the base station, where the compressed CSI is used by the base station to perform reconstruction according to the coding parameter group to obtain a next data transmission for the base station Said initial CSI.
  • Another object of the present invention is to provide a CSI feedback device, located in a base station, including: a second coding identifier acquiring unit, configured to acquire a coding identifier, where the coding identifier is based on HARQ information and a current uplink channel state of the base station At least one of the determinations, the HARQ information is determined by
  • the UE obtains according to the current data receiving result
  • a CSI receiving unit configured to receive the compressed CSI sent by the UE;
  • a second encoding parameter group obtaining unit configured to acquire, in a preset plurality of encoding parameter groups, an encoding parameter group corresponding to the encoding identifier;
  • a CSI reconstruction unit configured to reconstruct the compressed CSI according to the coding parameter group to obtain an initial CSI for the next data transmission of the base station.
  • the embodiment of the present invention is based on the wireless communication system using the MIMO technology, and adjusts the coding mode of the CSI fed back by the UE to the base station in real time according to the current downlink performance of the base station and the uplink channel state of the base station to the UE, so that the UE feedback
  • the accuracy of the CSI can be adaptively changed according to the current uplink and downlink communication conditions of the base station, thereby optimizing the data transmission capability of the system.
  • FIG. 1 is a schematic diagram of a system scenario to which a CSI feedback method according to an embodiment of the present invention is applied.
  • FIG. 2 is a flowchart of implementing a CSI feedback method on a UE side according to an embodiment of the present invention;
  • FIG. 3 is a CSI feedback method according to an embodiment of the present invention.
  • FIG. 4 is a structural block diagram of a CSI feedback apparatus according to an embodiment of the present invention. detailed description
  • the embodiment of the present invention is based on the wireless communication system using the MIMO technology, and adjusts the coding mode of the CSI fed back by the UE to the base station in real time according to the current downlink performance of the base station and the uplink channel state of the base station to the UE, so that the UE feedback
  • the accuracy of the CSI can be based on the current base station uplink and downlink
  • the communication status is adaptively changed to optimize the data transmission capability of the system. For the convenience of explanation, only the parts related to the present embodiment are shown.
  • the system can be a wireless communication system using MIMO technology, wherein the base station 11 uses one of the different beams to simultaneously serve one or more UEs 12 by forming different beams on its antenna array. Each UE 12 feeds back the compressed CSI through the uplink channel 13 of the base station, and the base station 11 adjusts the beamforming by recombining the UEs 12 to the CSI of the base station 11, thereby completing the transmission scheduling on the downlink channel 14.
  • the execution body of the process is one of the UEs 12 in Figure 1, as detailed below:
  • step S201 an encoding identifier is obtained, where the encoding identifier is determined according to at least one of Hybrid Automatic Repeat ReQuest (HARQ ) information and a current uplink channel state of the base station, where the HARQ information is according to the current UE.
  • HARQ Hybrid Automatic Repeat ReQuest
  • step S202 the coding parameter group corresponding to the coding identifier is obtained in a preset plurality of coding parameter groups.
  • all the coding parameter groups that may be involved in the compression coding of the CSI by the UE in the CSI feedback process are preset on the base station side and the UE side according to the protocol or the system environment, and each coding parameter group is included in each coding parameter group.
  • a plurality of encoding parameters are used, thereby corresponding to a compression encoding mode according to the plurality of encoding parameters, that is, the UE can determine the encoding mode used for compression encoding the CSI according to the encoding parameters included in each encoding parameter group.
  • the coding parameters include but are not limited to:
  • Encoding mode direct encoding, differential encoding, etc.
  • Compressed quantized codebook type codebook length, high-precision codebook, low-precision codebook, etc.
  • the number of feedback paths whether the delay of the feedback path, and so on.
  • a unique coding identifier is used for correspondence. For example, if a 2-bit coding is used as the coding identifier, different coding identifiers may be corresponding to the four coding parameter groups.
  • the UE obtains the coding identifier, that is, the coding parameter group corresponding to the coding identifier is configured in the preset multiple coding parameter groups according to the coding identifier, thereby determining the manner of compression coding the CSI.
  • the coding identifier is determined by the base station to be sent to the UE.
  • the UE feeds back the acquired HARQ information to the base station, and the base station performs comprehensive judgment according to at least one of the feedback HARQ information and the current uplink channel state of the base station, and configures corresponding according to the preset judgment manner.
  • Code identification is sent by the base station to the UE by means of downlink signaling.
  • the UE after receiving the data transmitted by the base station, the UE accordingly feeds back the HARQ information generated according to the result of the data reception to the base station.
  • the feedback HARQ information is Negative Acknowledgement (NACK)
  • NACK Negative Acknowledgement
  • ACK Acknowledgement
  • the data reception is correct, that is, the transmission parameters used by the base station are better matched with the downlink channel, so that the communication quality is correspondingly better.
  • a default coding parameter group that is, a default coding parameter group
  • a default coding parameter group may be preset in all coding parameter groups, if the UE is in the beginning of communication or during communication, UE If the coded identifier from the base station is not received, it may directly be based on the coding parameter.
  • the group compresses the CSI and feeds back.
  • the base station can also perform compression and feedback on the CSI by using the coding parameter group used in the previous compression.
  • the base station may determine whether the coded identifier is sent at this time by detecting whether the current coded identifier is the same as the previously transmitted coded identifier, if the current coded identifier and the previous code are sent. If the identifiers are different, the current coded identifier is sent to the UE. In this embodiment, if the UE does not receive the transmission coding identifier sent by the base station, the UE may perform CSI coding according to the default coding parameter group, or maintain the original coding parameter group to perform CSI coding.
  • the base station when the base station needs to obtain the coded identifier according to the HARQ information, when the base station sends the message to the UE only when the current coded identifier is different from the previous coded identifier, the base station may perform smoothing and filtering on the HARQ information. Determining the transmission of the coding identifier, the method can prevent the base station from frequently sending the updated coding identifier to the UE. For example, when only one of the ten data is received incorrectly, and the downlink performance of the base station does not change at this time, the data reception error is ignored by the smoothing filter to prevent the base station from frequently transmitting the coded identifier.
  • the base station determines the corresponding coding identifier, and the UE directly obtains the determined coding identifier, which correspondingly reduces the workload on the UE side.
  • the coding identifier may also be determined by the UE itself.
  • the UE performs comprehensive judgment according to at least one of the obtained HARQ information and the uplink channel state, and configures a corresponding coding identifier according to a preset judgment manner, where the UE may pass the latest uplink channel state.
  • the received Modulation Coding Schemes (MCS) in the scheduling information from the base station is used for judging.
  • MCS Modulation Coding Schemes
  • the corresponding coding identifier is determined by the UE, instead of being transmitted by the base station, which reduces the downlink overhead of the base station to some extent.
  • the process of configuring the coded identifier according to the HARQ information and the current uplink channel state of the base station may refer to the following principles:
  • the fed back HARQ information is NACK, it indicates that the coding mode used by the UE for CSI compression is not accurate enough, and the accuracy of the feedback CSI should be improved accordingly to improve the downlink performance of the base station.
  • the corresponding coding identifier can be configured to improve the CSI feedback accuracy.
  • the corresponding coding identifier can be configured to correspondingly reduce or improve the feedback of the CSI according to the actual needs of the system.
  • the accuracy of the coding mode used for CSI compression used by the UE at this time is sufficiently good.
  • the configured coding identifier can make feedback.
  • the CSI accuracy is correspondingly reduced, and the transmission load of the uplink channel of the base station is mitigated without affecting the downlink performance of the base station;
  • the corresponding coding identifier can be configured to reduce or improve the CSI feedback accuracy according to the actual needs of the system.
  • step S203 the initial CSI is compressed according to the coding parameter group to generate compressed CSI, and the initial CSI is obtained by measuring the current downlink channel of the base station.
  • step S204 the compressed CSI is fed back to the base station, and the compressed CSI is used by the base station to perform reconstruction according to the coding parameter group to obtain a next data transmission for the base station. Said initial CSI.
  • the UE obtains the current initial CSI by receiving the reference signal transmitted by the base station at the pre-known location, and obtains the current initial CSI, and compresses and encodes the initial CSI by using the obtained coding parameter group corresponding to the coded identifier.
  • the compressed CSI is generated and fed back to the base station, so that the base station reconstructs the compressed CSI according to the same coding parameter group to obtain the initial CSI, and uses the reconstructed initial CSI for the next data transmission.
  • the UE when the UE determines the corresponding coding identifier, the UE needs to send the determined coding identifier while transmitting the compressed CSI, so that the base station presets multiple coding parameter groups at the base station end according to the coding identifier. Determine the corresponding encoding parameter set.
  • the coding mode of the CSI fed back by the UE to the base station is adjusted in real time, so that the accuracy of the CSI fed back by the UE can be based on the current base station.
  • the uplink and downlink communication status is adaptively changed, thereby optimizing the data transmission capability of the system.
  • FIG. 3 is a flowchart showing an implementation process of a CSI feedback method according to an embodiment of the present invention.
  • an execution body of the process is the base station 11 in FIG. 1, and the details are as follows:
  • step S301 an encoding identifier is obtained, where the encoding identifier is determined according to at least one of HARQ information and a current uplink channel state of the base station, where the HARQ information is obtained by the UE according to a current data receiving result.
  • the encoding identifier is determined according to at least one of HARQ information and a current uplink channel state of the base station, where the HARQ information is obtained by the UE according to a current data receiving result.
  • the coding identifier is determined by the base station to be sent to the UE.
  • the UE feeds back the acquired HARQ information to the base station, and the base station performs comprehensive judgment according to at least one of the feedback HARQ information and the current uplink channel state of the base station, and configures the corresponding coding identifier according to the preset judgment manner, and passes the downlink.
  • the signaling mode sends the coded identifier to the UE.
  • the coding identifier may also be determined by the UE and then fed back to the base station, and may carry the coding identifier to feed back to the base station while feeding back the CSI.
  • the UE performs comprehensive judgment according to at least one of the obtained HARQ information and the uplink channel state, and configures a corresponding coded identifier according to a preset judgment manner, where the uplink channel state here, the UE may receive the recently received base station from the base station.
  • the MCS in the scheduling information is used for judging. When the UE receives the MCS corresponding to the high-order modulation and the high code rate, it means that the uplink channel state is good at this time; otherwise, the uplink channel state is poor.
  • step S302 the compressed CSI sent by the UE is received.
  • step S303 the coding parameter group corresponding to the coding identifier is obtained in a preset plurality of coding parameter groups.
  • the base station also presets all the coding parameter groups, and can obtain the coding parameter group corresponding to the coding identifier in the preset multiple coding parameter groups according to the obtained coding identifier.
  • step S304 the CSI is reconstructed according to the coding parameter group to obtain an initial CSI for the next data transmission of the base station.
  • FIG. 4 is a structural block diagram of a CSI feedback apparatus according to an embodiment of the present invention.
  • the apparatus shown in this embodiment is used to implement the CSI feedback method described in the embodiment of FIG. 2 and FIG. 3 of the present invention.
  • the part related to this embodiment is a structural block diagram of a CSI feedback apparatus according to an embodiment of the present invention.
  • the device may be a processor, including:
  • the first coded identifier obtaining unit 401 obtains a coded identifier, and the coded identifier is determined according to at least one of a HARQ information and a current uplink channel state of the base station, where the HARQ information is obtained according to a current data receiving result of the UE.
  • the first coding parameter group obtaining unit 402 acquires an encoding parameter group corresponding to the coding identifier in a preset plurality of coding parameter groups.
  • the CSI compression unit 403 compresses the initial CSI according to the coding parameter group to generate compressed CSI, and the initial CSI is obtained by measuring the current downlink channel of the base station.
  • the CSI feedback unit 404 feeds back the compressed CSI to the base station, and the compressed CSI is used by the base station to perform reconstruction according to the coding parameter group to obtain an initial CSI for the next data transmission of the base station. .
  • the first coding identifier obtaining unit 401 includes:
  • the HARQ information acquiring subunit acquires the HARQ information according to the current data receiving result.
  • the HARQ information feedback subunit feeds back the HARQ information to the base station.
  • a coding identifier receiving subunit and receiving, by the base station, the coding identifier determined according to the HARQ information and a current uplink channel state of the base station.
  • the initial CSI is pressed according to a pre-specified coding parameter group or a coding parameter group used in the previous compression. Shrink.
  • a smoothing filtering unit performing smoothing filtering on the HARQ information to prevent the base station from transmitting the updated coding identifier.
  • the first coded identifier obtaining unit 401 includes:
  • the HARQ information acquiring subunit acquires the HARQ information according to the current data receiving result. And an uplink channel state acquiring subunit, and acquiring, according to the scheduling information of the base station, a current uplink channel state of the base station.
  • the first coding identifier determining subunit determines the coding identifier according to the HARQ information and a current uplink channel state of the base station.
  • the device may be a processor, including:
  • the second coded identifier obtaining unit 405 obtains a coded identifier, and the coded identifier is determined according to at least one of the HARQ information and the current uplink channel state of the base station, where the HARQ information is obtained by the UE according to the current data receiving result.
  • the CSI receiving unit 406 receives the compressed CSI sent by the UE.
  • the second coding parameter group obtaining unit 407 obtains the coding parameter group corresponding to the coding identifier in a preset plurality of coding parameter groups.
  • the CSI reconstruction unit 408 reconstructs the compressed CSI according to the coding parameter group to obtain an initial CSI for the next data transmission of the base station.
  • the second encoding identifier obtaining unit 405 includes:
  • the HARQ information receiving subunit receives the HARQ information fed back by the UE.
  • the second coded identifier obtaining unit 405 further includes: a coded identifier sending subunit, configured to detect whether the coded identifier is the same as the previously transmitted coded identifier; if the coded identifier is different from the previously sent coded identifier Sending the coded identifier to the UE.
  • the second encoding identifier acquiring unit 405 is configured to receive the encoding identifier that is determined by the UE according to the HARQ information and a current uplink channel state of the base station.
  • the CSI coding mode fed back by the UE to the base station is adjusted in real time according to the current downlink performance of the base station and the uplink channel state of the base station to the UE, so that the accuracy of the CSI fed back by the UE can be based on the current base station uplink and downlink.
  • the communication status is adaptively changed to optimize the data transmission capability of the system.

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Abstract

一种CSI反馈方法及装置,包括:获取编码标识;在预设的多个编码参数组中获取所述编码标识对应的编码参数组;根据所述编码参数组对初始CSI进行压缩,生成压缩的CSI,所述初始CSI通过测量所述基站当前的下行信道获取;将所述压缩的CSI反馈给所述基站,所述压缩的CSI被所述基站用于根据所述编码参数组进行重建得到用于所述基站的下一次数据发送的所述初始CSI。本发明根据当前的基站下行性能及基站到UE的上行信道状态,实时地对UE向基站反馈的CSI的编码模式做出调整,从而使得UE反馈的CSI的精度能够根据当前的基站上下行通信状况进行自适应变更,从而优化了系统的数据传输能力。

Description

一种信道状态信息反馈方法及装置
本申请要求于 2012 年 4 月 20 日提交中国专利局、 申请号为 201210118620.6、 发明名称为"一种信道状态信息反馈方法及装置"的中国专利 申请的优先权, 其全部内容通过引用结合在本申请中。 技术领域
本发明属于通信技术领域, 尤其涉及一种信道状态信息 (Channel State Information, CSI )反馈方法及装置。
背景技术
多入多出 ( Multiple-Input Multiple-Output, MIMO ) 系统通过在基站的发 射端和接收端分别配置多个天线来大大提高无线通信系统的数据传输率,现已 被包括长期演进 ( Long Term Evolution, LTE ) 、 先进长期演进 ( Long Term Evolution- Advanced, LTE-A )等一系列无线标准所釆用。 上述无线通信系统 通过釆用一些高级 MIMO技术以进一步改善系统的性能。
以多用户 MIMO ( Multi-User MIMO, MU-MIMO )技术为例, 基站利用 在天线阵上形成的不同波束来为多个 UE提供服务。 在上述过程中, 基站需要 获取其到各个 UE之间的下行信道的 CSI, 以此来调整波束, 调度发射。 上述 CSI是由基站服务的 UE通过基站的上行信道进行反馈的,反馈的 CSI越精确, 下行信道性能提升的越高,但这也意味着需要更多的上行开销来反馈这些精确 度高的 CSI, 因此需要对反馈的 CSI进行压缩编码以降低上行开销。
现有技术将 CSI从频域变换到时域中进行压缩编码,然而,其编码方式的 相关参数都是预设的, 一旦设定了, 在一个较长的通信过程中, 即使反馈的 CSI在重建后失真严重, 导致基站的下行性能降低, 反馈的 CSI的精度也不再 更改,进而导致由 CSI带来的反馈开销在该通信过程中也不再更改。在上述情 况下, 当基站的上行信道状态较好, 能够传输更多的数据时, 就无法通过提高 反馈开销来增加 CSI的精度,提高基站下行性能; 当基站的上行信道状态较差 时, 维持原有的反馈开销可能超出了基站的上行信道负荷, 导致反馈过程中大 量误码出现,基站无法准确地对压缩后的 CSI进行重建,从而相应地带来基站 下行性能的降低。 发明内容
本发明实施例的目的在于提供一种 CSI反馈方法, 旨在使得 MIMO系统 中 UE反馈的 CSI的精度能够根据基站的下行性能及上行信道状态的变化进行 自适应的调整。 本发明实施例是这样实现的, 一种 CSI反馈方法, 其特征在于, 包括: 获取编码标识, 所述编码标识根据 HARQ信息和基站当前的上行信道状 态中的至少一项确定, 所述 HARQ信息根据 UE当前的数据接收结果获取; 在预设的多个编码参数组中获取所述编码标识对应的编码参数组; 根据所述编码参数组对初始 CSI进行压缩, 生成压缩的 CSI, 所述初始 CSI通过测量所述基站当前的下行信道获取;
将所述压缩的 CSI反馈给所述基站,所述压缩的 CSI被所述基站用于根据 所述编码参数组进行重建得到用于所述基站的下一次数据发送的所述初始 CSI。
本发明实施例的另一目的在于提供一种 CSI反馈方法, 包括: 获取编码标识, 所述编码标识根据 HARQ信息和基站当前的上行信道状 态中的至少一项确定, 所述 HARQ信息由 UE根据当前的数据接收结果获取; 接收所述 UE发送的压缩的 CSI;
在预设的多个编码参数组中获取所述编码标识对应的编码参数组; 根据所述编码参数组对所述压缩的 CSI进行重建得到用于所述基站的下 一次数据发送的初始 CSI。
本发明实施例的另一目的在于提供一种 CSI反馈装置, 位于 UE, 包括: 第一编码标识获取单元, 用于获取编码标识, 所述编码标识根据 HARQ 信息和基站当前的上行信道状态中的至少一项确定, 所述 HARQ信息根据所 述 UE当前的数据接收结果获取;
第一编码参数组获取单元,用于在预设的多个编码参数组中获取所述编码 标识对应的编码参数组;
CSI压缩单元, 用于根据所述编码参数组对初始 CSI进行压缩, 生成压缩 的 CSI, 所述初始 CSI通过测量所述基站当前的下行信道获取;
CSI反馈单元, 用于将所述压缩的 CSI反馈给所述基站, 所述压缩的 CSI 被所述基站用于根据所述编码参数组进行重建得到用于所述基站的下一次数 据发送的所述初始 CSI。
本发明实施例的另一目的在于提供一种 CSI反馈装置, 位于基站, 包括: 第二编码标识获取单元, 用于获取编码标识, 所述编码标识根据 HARQ 信息和所述基站当前的上行信道状态中的至少一项确定, 所述 HARQ信息由
UE根据当前的数据接收结果获取;
CSI接收单元, 用于接收所述 UE发送的压缩的 CSI; 第二编码参数组获取单元,用于在预设的多个编码参数组中获取所述编码 标识对应的编码参数组;
CSI重建单元,用于根据所述编码参数组对所述压缩的 CSI进行重建得到 用于所述基站的下一次数据发送的初始 CSI。
本发明实施例基于釆用了 MIMO技术的无线通信系统, 根据当前的基站 下行性能及基站到 UE的上行信道状态, 实时地对 UE向基站反馈的 CSI的编 码模式做出调整,从而使得 UE反馈的 CSI的精度能够根据当前的基站上下行 通信状况进行自适应变更, 从而优化了系统的数据传输能力。 附图说明
图 1是本发明实施例提供的 CSI反馈方法所适用的系统场景示意图; 图 2是本发明实施例提供的 CSI反馈方法 UE侧的实现流程图; 图 3是本发明实施例提供的 CSI反馈方法基站侧的实现流程图; 图 4是本发明实施例提供的 CSI反馈装置的结构框图。 具体实施方式
为了使本发明的目的、技术方案及优点更加清楚明白, 以下结合附图及实 施例, 对本发明进行进一步详细说明。 应当理解, 此处所描述的具体实施例仅 仅用以解释本发明, 并不用于限定本发明。
本发明实施例基于釆用了 MIMO技术的无线通信系统, 根据当前的基站 下行性能及基站到 UE的上行信道状态, 实时地对 UE向基站反馈的 CSI的编 码模式做出调整,从而使得 UE反馈的 CSI的精度能够根据当前的基站上下行 通信状况进行自适应变更, 从而优化了系统的数据传输能力。 为了便于说明, 仅示出了与本实施例相关的部分。
参照图 1 , 该系统可以为釆用了 MIMO技术的无线通信系统, 其中,基站 11通过在其天线阵上形成不同的波束, 从而利用这些不同的波束同时为 1个 或者多个 UE 12服务。每个 UE 12通过基站的上行信道 13反馈压缩后的 CSI, 而基站 11通过将各个 UE 12反馈给基站 11的 CSI进行重建来调整波束形成, 从而完成在下行信道 14上的发射调度。
下面对图 1所示的系统场景下的 CSI反馈方法进行详细阐述: 流程的执行主体为图 1中的其中一个 UE 12, 详述如下:
在步骤 S201 中, 获取编码标识, 所述编码标识根据混合自动重传请求 ( Hybrid Automatic Repeat reQuest, HARQ )信息和基站当前的上行信道状态 中的至少一项确定, 所述 HARQ信息根据 UE当前的数据接收结果获取。
在步骤 S202中, 在预设的多个编码参数组中获取所述编码标识对应的编 码参数组。
在本实施例中, 在基站侧和 UE侧均根据协议或者系统环境预设了在 CSI 反馈过程中 UE对 CSI进行压缩编码所可能涉及到的所有编码参数组,每个编 码参数组中均包含了多个编码参数,由此根据这多个编码参数来对应一种压缩 编码模式, 即 UE根据每个编码参数组中包含的编码参数就能够确定出对 CSI 进行压缩编码所使用的编码方式。 其中, 编码参数包括但不限于:
编码模式: 直接编码、 差分编码等; 压缩量化码本类型: 码本长度、 高精度码本、 低精度码本等; 以及反馈径数、 是否反馈径的时延等等。
对于每个编码参数组,在本实施例中均由一个唯一的编码标识来对应, 例 如,釆用 2bit的编码作为编码标识,则不同的编码标识可以——对应 4个编码 参数组。 UE通过获取到编码标识, 即可以根据该编码标识在预设的多个编码 参数组中配置到该编码标识对应的编码参数组 ,由此确定对 CSI进行压缩编码 的方式。
作为本发明的一个实施例, 编码标识由基站确定后向 UE发送。 在本实施 例中, UE将获取到的 HARQ信息反馈给基站, 并由基站根据反馈的 HARQ 信息和基站当前的上行信道状态中的至少一项进行综合判断,根据预设的判断 方式配置相应的编码标识。在本实施例中, 编码标识是由基站通过下行信令的 方式向 UE发送的。
关于 HARQ信息, UE在接收到基站此次发送的数据之后, 相应地, 会向 基站反馈根据此次数据接收的结果生成的 HARQ信息。 当反馈的 HARQ信息 为否定应答 ( Negative Acknowledgement, NACK ) 时, 则代表此次数据接收 的结果不正确, 即基站所使用的发射参数与下行信道不匹配, 导致通信质量下 降; 当反馈的 HARQ信息为肯定应答(Acknowledgement, ACK )时, 则代表 此次数据接收正确, 即基站所使用的发射参数与下行信道匹配较好,使得通信 质量也相应较好。
需要说明的是, 当由基站发送编码标识时, 可以在所有的编码参数组中预 设一个缺省的编码参数组, 即默认的编码参数组, 若在通信开始阶段或者在通 信过程中, UE未接收到来自基站的编码标识时, 则可以直接根据该编码参数 组对 CSI进行压缩后反馈。在上述情况下,基站也可以利用在前一次压缩使用 的编码参数组对 CSI进行压缩后反馈。
优选地, 由基站发送编码标识时, 在发送前基站可以通过检测当前的编码 标识与前一次发送的编码标识是否相同来确定是否在此次发送编码标识,如果 当前编码标识与前一次发送的编码标识不相同,则向 UE发送当前的编码标识。 在本实施例中, UE若未接收到基站发送的发送编码标识, 则可以根据默认的 编码参数组进行 CSI的编码, 或者维持原先的编码参数组进行 CSI的编码。
进一步, 优选地, 在需要根据 HARQ信息获取编码标识的情况下, 当基 站仅在当前编码标识与前一次发送的编码标识不相同时才向 UE发送时,基站 可以对 HARQ信息进行平滑滤波后再判断发送编码标识, 该方法可以避免基 站频繁地向 UE发送更新的编码标识。 例如, 当十个数据中仅有一个数据接收 错误, 此时并不代表基站的下行性能发生了变化, 则通过平滑滤波忽略掉该数 据接收错误的情况, 以避免基站频繁发送编码标识。
在本实施例中, 由基站确定相应的编码标识, UE直接获取确定的编码标 识 , 相应地降低了 UE侧的工作负荷。
作为本发明的一个实施例, 编码标识也可以由 UE自行确定。 在本实施例 中, UE根据获取到的 HARQ信息和上行信道状态中的至少一项进行综合判断, 根据预设的判断方式配置相应的编码标识, 其中, 这里的上行信道状态, UE 可以通过最近接收到的来自基站的调度信息中的调制编码算法 ( Modulation Coding Schemes, MCS )来进行判断, 当最近 UE接收到 MCS对应于高阶调 制、 高码率时, 意味着这时上行信道状态较好; 反之则意味着上行信道状态较 差。 在本实施例中,由 UE来确定相应的编码标识,而不是由基站来进行发送, 一定程度上降低了基站的下行开销。
无论是由基站还是由 UE来确定相应的编码标识, 根据 HARQ信息以及 基站的当前上行信道状态来配置编码标识的过程可以参考以下原则:
1、 当反馈的 HARQ信息为 NACK时, 代表此时 UE所使用的用于 CSI 压缩的编码模式精度不够,应该相应地提高反馈的 CSI的精度, 以提升基站的 下行性能。 此时, 若基站的上行信道状态较好, 能够传输更多的数据, 则可以 选择配置相应的编码标识以提高 CSI反馈精度;
2、 当反馈的 HARQ信息为 NACK时, 此时, 若基站的上行信道状态较 差, 传输负荷较重, 则可以配置相应的编码标识, 以根据系统的实际需求相应 地降低或者提高 CSI的反馈精度;
3、 当反馈的 HARQ信息为 ACK时, 代表此时 UE所使用的用于 CSI压 缩的编码模式精度足够好, 此时, 若基站的上行信道状态较差, 则配置的编码 标识能够使得反馈的 CSI精度相应降低,在不影响基站下行性能的前提下,减 轻基站上行信道的传输负荷;
4、 当反馈的 HARQ信息为 ACK时, 此时, 若基站的上行信道状态较好, 则可以配置相应的编码标识, 以根据系统的实际需求相应地降低或者提高 CSI 的反馈精度。
以上仅列举了几种编码标识的配置原则, 显然, 在实际的配置过程中, 还 可以仅根据 HARQ信息来获取相应的编码标识, 或者仅根据基站的当前上行 信道状态来获取相应的编码标识,且实际的配置过程并不限于上述原则, 本实 施例对此不作限定, 在此不再赘述。 在步骤 S203中, 才艮据所述编码参数组对初始 CSI进行压缩, 生成压缩的 CSI, 所述初始 CSI通过测量所述基站当前的下行信道获取。
在步骤 S204中, 将所述压缩的 CSI反馈给所述基站, 所述压缩的 CSI被 所述基站用于根据所述编码参数组进行重建后得到用于所述基站的下一次数 据发送的所述初始 CSI。
在本实施例中, UE通过在预知的位置上接收基站发射的参考信号做信道 估计, 获取到当前的初始 CSI, 并通过获取到的编码标识所对应的编码参数组 对初始 CSI进行压缩编码, 从而生成压缩后的 CSI, 反馈给基站, 以使基站根 据相同的编码参数组对压缩后的 CSI进行重建后得到初始 CSI,将重建的初始 CSI用于下一次数据的发送。
需要说明的是, 当由 UE来确定相应的编码标识时, 需要 UE在发送压缩 的 CSI的同时发送确定的编码标识,以使基站根据该编码标识在其基站端预设 的多个编码参数组中确定相应的编码参数组。
在本实施例中, 根据当前的基站下行性能及基站到 UE的上行信道状态, 实时地对 UE向基站反馈的 CSI的编码模式做出调整, 从而使得 UE反馈的 CSI的精度能够根据当前的基站上下行通信状况进行自适应变更,从而优化了 系统的数据传输能力。
图 3示出了本发明实施例提供的 CSI反馈方法的实现流程,在本实施例中, 流程的执行主体为图 1中的基站 11 , 详述如下:
在步骤 S301中, 获取编码标识, 所述编码标识根据 HARQ信息和所述基 站当前的上行信道状态中的至少一项确定, 所述 HARQ信息由 UE根据当前 的数据接收结果获取。 步骤 S301的执行方式有两种:
作为本发明的一个实施例, 编码标识由基站确定后向 UE发送。 UE将获 取到的 HARQ信息反馈给基站, 并由基站根据反馈的 HARQ信息和基站当前 的上行信道状态中的至少一项进行综合判断,根据预设的判断方式配置相应的 编码标识, 并通过下行信令的方式向 UE发送该编码标识。
作为本发明的另一实施例, 编码标识也可以由 UE 自行确定后反馈给基 站, 可以在反馈 CSI 的同时携带编码标识以反馈给基站。 UE根据获取到的 HARQ信息和上行信道状态中的至少一项进行综合判断,根据预设的判断方式 配置相应的编码标识, 其中, 这里的上行信道状态, UE可以通过最近接收到 的来自基站的调度信息中的 MCS来进行判断,当最近 UE接收到 MCS对应于 高阶调制、 高码率时, 意味着这时上行信道状态较好; 反之则意味着上行信道 状态较差。
具体的编码标识获取原理已在本发明图 2所示实施例中进行了详细阐述, 因此在此不再赘述。
在步骤 S302中, 接收所述 UE发送的压缩的 CSI。
在步骤 S303中, 在预设的多个编码参数组中获取所述编码标识对应的编 码参数组。
在本实施例中,基站同样预设了所有的编码参数组, 能够根据获取到的编 码标识在预设的多个编码参数组中获取该编码标识对应的编码参数组。
在步骤 S304中, 根据所述编码参数组对所述的 CSI重建得到用于所述基 站的下一次数据发送的初始 CSI。
由于本实施例与本发明图 2所示的实施例实现原理相一致,因此在此不再 赘述。
图 4示出了本发明实施例提供的 CSI反馈装置的结构框图,本实施例所示 装置用于实现本发明图 2和图 3实施例所阐述的 CSI反馈方法,为了便于说明, 仅示出了与本实施例相关的部分。
参照图 4, 在 UE中, 该装置可以是处理器, 包括:
第一编码标识获取单元 401 , 获取编码标识, 所述编码标识根据 HARQ 信息和所述基站当前的上行信道状态中的至少一项确定, 所述 HARQ信息根 据所述 UE当前的数据接收结果获取。
第一编码参数组获取单元 402, 在预设的多个编码参数组中获取所述编码 标识对应的编码参数组。
CSI压缩单元 403 , 根据所述编码参数组对初始 CSI进行压缩, 生成压缩 的 CSI, 所述初始 CSI通过测量所述基站当前的下行信道获取。
CSI反馈单元 404, 将所述压缩的 CSI反馈给所述基站, 所述压缩的 CSI 被所述基站用于根据所述编码参数组进行重建得到用于所述基站的下一次数 据发送的初始 CSI。
作为本发明的一个实施例, 第一编码标识获取单元 401包括:
HARQ信息获取子单元,根据当前的数据接收结果获取所述 HARQ信息。
HARQ信息反馈子单元, 将所述 HARQ信息反馈给所述基站。
编码标识接收子单元, 接收所述基站根据所述 HARQ信息和所述基站当 前的上行信道状态确定的所述编码标识。
在本实施例中, 当 CSI压缩单元 403未获取到所述编码标识时,根据预先 指定的编码参数组或者前一次压缩使用的编码参数组对所述初始 CSI进行压 缩。
进一步地, 还包括:
平滑滤波单元, 对所述 HARQ信息进行平滑滤波, 以避免基站发送更新 的编码标识。
作为本发明的另一实施例, 第一编码标识获取单元 401包括:
HARQ信息获取子单元,根据当前的数据接收结果获取所述 HARQ信息。 上行信道状态获取子单元,根据所述基站的调度信息获取所述基站当前的 上行信道状态。
第一编码标识确定子单元, 根据所述 HARQ信息和所述基站当前的上行 信道状态确定所述编码标识。
在基站中, 该装置可以是处理器, 包括:
第二编码标识获取单元 405 , 获取编码标识, 所述编码标识根据 HARQ 信息和所述基站当前的上行信道状态中的至少一项确定, 所述 HARQ信息由 UE根据当前的数据接收结果获取。
CSI接收单元 406, 接收所述 UE发送的压缩的 CSI。
第二编码参数组获取单元 407, 在预设的多个编码参数组中获取所述编码 标识对应的编码参数组。
CSI重建单元 408, 根据所述编码参数组对所述压缩的 CSI进行重建得到 用于所述基站的下一次数据发送的初始 CSI。
作为本发明的一个实施例, 第二编码标识获取单元 405包括:
HARQ信息接收子单元, 接收所述 UE反馈的所述 HARQ信息。
第二编码标识确定子单元, 根据所述 HARQ信息和所述基站当前的上行 信道状态确定所述编码标识。 编码标识发送子单元, 向所述 UE发送所述编码标识。 进一步地, 第二编码标识获取单元 405还包括: 编码标识发送子单元,用于检测所述编码标识与前一次发送的编码标识是 否相同; 如果所述编码标识与前一次发送的编码标识不相同, 则向所述 UE发 送所述编码标识。 作为本发明的另一实施例, 第二编码标识获取单元 405用于接收所述 UE 根据所述 HARQ信息和所述基站当前的上行信道状态确定的所述编码标识。 本发明实施例根据当前的基站下行性能及基站到 UE的上行信道状态, 实 时地对 UE向基站反馈的 CSI的编码模式做出调整, 从而使得 UE反馈的 CSI 的精度能够根据当前的基站上下行通信状况进行自适应变更,从而优化了系统 的数据传输能力。
以上所述仅为本发明的较佳实施例而已, 并不用以限制本发明, 凡在本发 明的精神和原则之内所作的任何修改、等同替换和改进等, 均应包含在本发明 的保护范围之内。

Claims

权 利 要 求
1、 一种信道状态信息 CSI反馈方法, 其特征在于, 包括:
获取编码标识, 所述编码标识根据混合自动重传请求 HARQ信息和基站 当前的上行信道状态中的至少一项确定, 所述 HARQ信息根据用户设备 UE 当前的数据接收结果获取;
在预设的多个编码参数组中获取所述编码标识对应的编码参数组; 根据所述编码参数组对初始 CSI进行压缩, 生成压缩的 CSI, 所述初始 CSI通过测量所述基站当前的下行信道获取;
将所述压缩的 CSI反馈给所述基站, 所述压缩的 CSI被所述基站用于根 据所述编码参数组进行重建得到用于所述基站的下一次数据发送的所述初始 CSI。
2、 如权利要求 1所述的方法, 其特征在于, 所述获取编码标识包括: 根据当前的数据接收结果获取所述 HARQ信息;
将所述 HARQ信息反馈给所述基站;
接收所述基站根据所述 HARQ信息和所述基站当前的上行信道状态确定 的所述编码标识。
3、 如权利要求 2所述的方法, 其特征在于, 当未获取到所述编码标识时, 所述方法还包括:根据预先指定的编码参数组或者前一次压缩使用的编码参数 组对所述初始 CSI进行压缩。
4、 如权利要求 2所述的方法, 其特征在于, 在将所述 HARQ信息反馈给 所述基站之前, 还包括:
对所述 HARQ信息进行平滑滤波。
5、 如权利要求 1所述的方法, 其特征在于, 所述获取编码标识包括: 根据当前的数据接收结果获取所述 HARQ信息;
根据来自所述基站的调度信息获取所述基站当前的上行信道状态; 根据所述 HARQ 信息和所述基站当前的上行信道状态确定所述编码标 识。
6、 一种信道状态信息 CSI反馈方法, 其特征在于, 包括:
获取编码标识, 所述编码标识根据混合自动重传请求 HARQ信息和基站 当前的上行信道状态中的至少一项确定, 所述 HARQ信息由用户设备 UE根 据当前的数据接收结果获取;
接收所述 UE发送的压缩的 CSI;
在预设的多个编码参数组中获取所述编码标识对应的编码参数组; 根据所述编码参数组对所述压缩的 CSI进行重建得到用于所述基站的下 一次数据发送的初始 CSI。
7、 如权利要求 6所述的方法, 其特征在于, 所述获取编码标识包括: 接收所述 UE反馈的所述 HARQ信息;
根据所述 HARQ 信息和所述基站当前的上行信道状态确定所述编码标 识。
8、 如权利要求 7所述的方法, 其特征在于, 还包括:
检测所述编码标识与前一次发送的编码标识是否相同;如果所述编码标识 与前一次发送的编码标识不相同, 则向所述 UE发送所述编码标识。
9、 如权利要求 6所述的方法, 其特征在于, 所述获取编码标识包括: 接收所述 UE根据所述 HARQ信息和所述基站当前的上行信道状态确定 的所述编码标识。
10、 一种信道状态信息 CSI反馈装置, 其特征在于, 位于用户设备 UE, 包括:
第一编码标识获取单元,用于获取编码标识, 所述编码标识根据混合自动 重传请求 HARQ 信息和基站当前的上行信道状态中的至少一项确定, 所述 HARQ信息根据所述 UE当前的数据接收结果获取;
第一编码参数组获取单元,用于在预设的多个编码参数组中获取所述编码 标识对应的编码参数组;
CSI压缩单元, 用于根据所述编码参数组对初始 CSI进行压缩, 生成压缩 的 CSI, 所述初始 CSI通过测量所述基站当前的下行信道获取;
CSI反馈单元, 用于将所述压缩的 CSI反馈给所述基站, 所述压缩的 CSI 被所述基站用于根据所述编码参数组进行重建得到用于所述基站的下一次数 据发送的所述初始 CSI。
11、 如权利要求 10所述的装置, 其特征在于, 所述第一编码标识获取单 元包括:
HARQ信息获取子单元, 用于根据当前的数据接收结果获取所述 HARQ 信息;
HARQ信息反馈子单元, 用于将所述 HARQ信息反馈给所述基站; 编码标识接收子单元, 用于接收所述基站根据所述 HARQ信息和所述基 站当前的上行信道状态确定的所述编码标识。
12、 如权利要求 11所述的装置, 其特征在于, 所述 CSI压缩单元用于当 未获取到所述编码标识时,根据预先指定的编码参数组或者前一次压缩使用的 编码参数组对所述初始 CSI进行压缩。
13、 如权利要求 11所述的装置, 其特征在于, 还包括:
平滑滤波单元, 用于对所述 HARQ信息进行平滑滤波。
14、 如权利要求 10所述的装置, 其特征在于, 所述第一编码标识获取单 元包括:
HARQ信息获取子单元, 用于根据当前的数据接收结果获取所述 HARQ 信息;
上行信道状态获取子单元,用于根据所述基站的调度信息获取所述基站当 前的上行信道状态;
第一编码标识确定子单元, 用于根据所述 HARQ信息和所述基站当前的 上行信道状态确定所述编码标识。
15、 一种信道状态信息 CSI反馈装置, 其特征在于, 位于基站, 包括: 第二编码标识获取单元,用于获取编码标识, 所述编码标识根据混合自动 重传请求 HARQ信息和所述基站当前的上行信道状态中的至少一项确定, 所 述 HARQ信息由用户设备 UE根据当前的数据接收结果获取;
CSI接收单元, 用于接收所述 UE发送的压缩的 CSI;
第二编码参数组获取单元,用于在预设的多个编码参数组中获取所述编码 标识对应的编码参数组;
CSI重建单元,用于根据所述编码参数组对所述压缩的 CSI进行重建得到 用于所述基站的下一次数据发送的初始 CSI。
16、 如权利要求 15所述的装置, 其特征在于, 所述第二编码标识获取单 元包括: HARQ信息接收子单元, 用于接收所述 UE反馈的所述 HARQ信息; 第二编码标识确定子单元, 用于根据所述 HARQ信息和所述基站当前的 上行信道状态确定所述编码标识。
17、 如权利要求 16所述的装置, 其特征在于, 所述第二编码标识获取单 元还包括:
编码标识发送子单元,用于检测所述编码标识与前一次发送的编码标识是 否相同; 如果所述编码标识与前一次发送的编码标识不相同, 则向所述 UE发 送所述编码标识。
18、 如权利要求 15所述的装置, 其特征在于, 所述第二编码标识获取单 元用于接收所述 UE根据所述 HARQ信息和所述基站当前的上行信道状态确 定的所述编码标识。
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