WO2012041107A1 - 信道状态信息反馈方法及终端 - Google Patents

信道状态信息反馈方法及终端 Download PDF

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Publication number
WO2012041107A1
WO2012041107A1 PCT/CN2011/076771 CN2011076771W WO2012041107A1 WO 2012041107 A1 WO2012041107 A1 WO 2012041107A1 CN 2011076771 W CN2011076771 W CN 2011076771W WO 2012041107 A1 WO2012041107 A1 WO 2012041107A1
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Prior art keywords
subbands
information
cqi
feedback
subband
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PCT/CN2011/076771
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English (en)
French (fr)
Inventor
陈艺戬
徐前子
李儒岳
徐俊
张峻峰
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中兴通讯股份有限公司
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Publication of WO2012041107A1 publication Critical patent/WO2012041107A1/zh

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    • 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
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00Arrangements for detecting or preventing errors in the information received
    • H04L1/02Arrangements for detecting or preventing errors in the information received by diversity reception
    • H04L1/06Arrangements for detecting or preventing errors in the information received by diversity reception using space diversity

Definitions

  • the present invention relates to the field of communications, and in particular to a channel state information feedback method and terminal.
  • BACKGROUND In a wireless communication 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.
  • the channel feature vector information is used for precoding directly, for multi-user multi-input multi-output (Multiple User Multi-input Multi- In output, MU-MIMO, more accurate channel information is needed to guide multi-user precoding.
  • 3GPP 3rd Generation Partnership Project
  • LTE Long Term Evolution
  • the feedback of channel information is mainly based on a simple single codebook feedback method, while MIMO
  • the performance of the transmit precoding technique depends on the accuracy of the codebook feedback therein.
  • the transmitting end and the receiving end jointly save or generate the codebook in real time (the transmitting end is the same as the receiving end).
  • the receiving end selects a codeword that best matches the actual channel H from the codebook space according to a certain criterion, and feeds back the sequence number of the codeword ⁇ ' (codeword number) Back to the transmitter.
  • the codeword sequence number is called the precoding matrix indicator in the codebook (Precoding Matrix
  • the transmitting end finds the corresponding precoding codeword according to the sequence number z ', thereby obtaining the corresponding channel information, and representing the feature vector information of the channel.
  • the codebook space may be further divided into codebooks corresponding to multiple Ranks, and each Rank corresponds to a plurality of codewords to quantize the precoding matrix formed by the channel feature vectors under the Rank. Since the number of Rank and non-zero feature vectors of the channel are equal, in general, Rank is N. The time code word will have N columns. Therefore, the codebook space ⁇ can be divided into multiple subcodebooks according to the difference of Rank, as shown in Table 1. Table 1 Schematic diagram of the codebook divided into multiple subcodes according to Rank
  • the codewords to be stored in the range of Rank>l are in the form of a matrix, wherein the codebook in the LTE protocol is a feedback method for the quantization of the codebook, and the LTE downlink 4 transmit antenna codebook is as shown in Table 2.
  • the precoding codebook and the channel information quantization codebook in LTE have the same meaning.
  • the vector can also be viewed as a matrix of dimension 1.
  • W n I— 2 Un / Un
  • I is a unit matrix, representing the _/column vector of the matrix ⁇ .
  • W l ' h denotes a matrix composed of the ... column of the matrix ⁇ , representing a conjugate transposed matrix of M "; wherein n represents a sequence number, and the value is 0 to 15.
  • the minimum feedback unit of channel information Subband, subband is composed of thousands of resource blocks (RBs), each RB is composed of multiple resource elements (RE elements); RE is time-frequency in LTE The minimum unit of the resource.
  • the corresponding object may be a multi-subband, or multiple sub-bands, and a wideband.
  • the specific granularity of the RB, subband Subband, and broadband Wideband is defined in ten. There are clear provisions in the 36.213 meeting.
  • Mode 7 Single 3 ⁇ 4 ⁇ 4 beamforming: Port 5 (Single-antenna port: port 5).
  • the feedback method and content in other transmission modes is generally a simplification of the transmission mode of closed-loop spatial multiplexing.
  • PMI information which characterizes feature vector information
  • the base station for downlink precoding techniques.
  • Table 1 the PMI is an index indicating a codeword in the codebook of Table 1, and the indicated codeword is used to represent feature vector information.
  • the RI information which characterizes the rank of the channel, is recommended to the base station as the number of layers supported by the downlink.
  • the CQI information indicates the quality information of the channel, and the channel quality is characterized by the recommended modulation and coding mode. The higher the order modulation coding mode indicates the better performance, and the LTE supports 16 CQI level selection.
  • the feedback type of PMI/RI/CQI in the uplink is divided into the following two types: Periodic feedback, which mainly carries feedback on the uplink control channel PUCCH.
  • the aperiodic feedback the feedback period feedback carried on the PUSCH of the uplink shared channel must be configured, the aperiodic feedback is an occasional trigger type feedback, and the aperiodic feedback on the PUSCH is a kind of high precision feedback, which is auxiliary. Feedback for improving accuracy.
  • Table 3 Non-cyclic feedback mode table
  • Mode xy in Table 3 x represents feedback of CQI, 1 is feedback of Wideband CQI, 2 is Subband CQI feedback, and 3 is CQI feedback of high-level configuration.
  • y indicates PMI feedback, 0 is no PMI, 1 is single PMI, and 2 is multiple PMI. Closed-loop spatial multiplexing always supports feedback with PMI, so the feedback mode supported on PUSCH is: Modes 1-2, 2-2, 3-1.
  • Modes 1-2 Feedback 1 PMI for each Subband; Feedback CQL for the entire bandwidth feedback
  • Modes 2-2 feedback a wideband CQI, and a wideband PMI; feedback M position information of better subbands; joint CQI of M subbands; joint PMI of M subbands; Modes 3-1: bandwidth range of high layer configuration Within the S subbands; fed back the joint CQI and joint PMI of the S subbands in the above bandwidth range; feedback each subband with a separate CQI.
  • the RI is also fed back in the same PUSCH subframe as the CQI information and the PMI information described above.
  • the feedback of CQI is mainly divided into sub-band CQI and wideband CQI, that is, the combined CQI of multiple sub-bands.
  • the meanings are assumed to be that the downlink uses a CQI level that can be supported by a subband transmission and a CQI level that can be supported by a plurality of subbands in the downlink.
  • the CQI for the same resource unit can be one or two.
  • the second CQI uses a differential technique, based on the first CQI difference, which is 3 bits.
  • the maximum is l ibit, which is also the maximum supportable overhead of CSI information when fed back on PUCCH.
  • CQI is an indicator to measure the quality of downlink channels.
  • CQI is represented by integer values from 0 to 15, representing different CQI levels, and different CQIs correspond to their respective modulation modes and code rate (MCS).
  • MCS modulation modes and code rate
  • the RI is used to describe the number of spatially independent channels, corresponding to the rank of the channel response matrix.
  • open-loop space multiplexing and closed-loop spatial multiplexing mode the UE needs to feed back RI information. In other modes, it is not necessary to feed back RI information.
  • PMI refers to the index number of the precoded codebook fed back by the UE.
  • CQI can be divided according to different principles: According to the measurement bandwidth, it is divided into wideband CQI (wideband CQI) and subband CQI (subband CQI).
  • the wideband CQI refers to the channel state indication for all subbands, and the obtained CQI information of the subband set S; the subband CQI pointer for the CQI information of each subband.
  • LTE divides the RB (Resource Block) corresponding to the effective bandwidth into thousands of RB groups according to different system bandwidths, and each RB group is called a subband, that is, a subband.
  • the subband CQI can be further divided into a full subband CQI and a Best M CQI: a full subband CQI reports CQI information of all subbands; Best M CQI selects M subbands from the subband set S, and uploads CQI information of the M subbands, And at the same time, the position information of 4 ⁇ M sub-bands.
  • it is divided into single stream CQI and dual stream CQI.
  • the open-loop spatial multiplexing mode since the channel state information is unknown, and the dual-stream channel information is equalized in the pre-coding, the CQIs of the two code streams are equal under open-loop spatial multiplexing.
  • the CQI representation method it is divided into an absolute value CQI and a differential CQI (Difference CQI).
  • the absolute value CQI is a CQI index (CQI index) expressed by 4 bits; a differential CQI (Differential CQI) is a CQI index expressed by 2 bits or 3 bits; It is divided into a differential CQI of the second code stream with respect to the first code stream, a differential CQI of the subband CQI with respect to the subband CQI, and a differential CQI of the suband CQI with respect to the wideband CQI.
  • the CQI information is divided into a wideband CQI, a UE selected (subband CQI), and a high layer configured (subband CQI) wideband CQI.
  • subband CQI is the Best M CQI, which feeds back the CQI information of the selected M subbands, and simultaneously positions the top 4 M subbands;
  • High layer configured is the full subband CQI, 4 pairs of each sub Bring a CQI message with feedback.
  • Both the high layer configured and the UE selected are sub-band CQI feedback modes. In the aperiodic feedback mode, the subband sizes defined by the two feedback modes are inconsistent. In the UE selected mode, the size of the M is also defined. And Table 3.
  • the feedback of the CQI/PMI and the RI may be periodic feedback or non-periodic feedback.
  • the specific feedback is shown in Table 6.
  • Table 6 Uplink physical channel corresponding to periodic feedback and aperiodic feedback
  • the CQI/PMI and RI of the periodic feedback are in the Physical Uplink Control Channel (PUCCH) in the format 2 /2a/2b (PUCCH format2/2a/2b) transmission, if the UE needs to transmit data, the CQI/PMI, RI is transmitted in the Physical Uplink Shared Channel (PUSCH); for aperiodic feedback For CQI/PMI and RI, it is transmitted only on PUSCH.
  • the channel information information feedback can be completed by the following steps: Step 1: The base station sends a pilot to the UE for estimating the downlink channel by the UE.
  • Step 2 The UE estimates the downlink channel according to the pilot signal.
  • Step 3 The UE determines the channel ⁇ ! Information, including RI, PMI, and CQI.
  • Step 4 The UE feeds back channel state information to the base station according to the feedback mode.
  • LTE-A Long Term Evolution Advanced
  • the Long Term Evolution Advanced (LTE-A) system as an evolutionary standard for LTE, supports larger system bandwidths (up to 100 MHz) and is backward compatible with existing LTE standards. In order to obtain higher cell average spectral efficiency and improve coverage and throughput of the cell edge, LTE-A supports up to 8 antennas on the basis of the existing LTE system, and proposes some codebook feedback.
  • the feedback enhancement technique mainly enhances the feedback accuracy of the codebook and utilizes the temporal correlation of the channel information and/or the frequency domain correlation compression overhead.
  • This technology can improve the spectrum utilization of the evolved International Mobile Telecommunications-Advance (IMT-Advance) system and alleviate the shortage of spectrum resources.
  • IMT-Advance International Mobile Telecommunications-Advance
  • the design and enhancement of the codebook also need to fully consider the characteristics of the dual polarization channel.
  • the main idea of the feedback technology of the enhanced codebook is: the feedback of the PMI feedback is increased relative to the feedback of the LTE, and the feedback of the two PMIs is used to jointly represent the state information of the channel, mainly including two implementation modes: defining a dual codebook and Dual PMI feedback or a single codebook that defines a dual codebook equivalent and dual PMI feedback defines a dual codebook and dual PMI feedback that can be further described as:
  • the precoding/feedback structure of a subband consists of two matrices.
  • Each of the two matrices belongs to a separate codebook.
  • the codebook is known in advance by the base station and the UE.
  • the feedback codewords can vary at different times and on different subbands.
  • 3) - A matrix represents the properties of a wideband or long-term channel. Another matrix represents the properties of the determined frequency band or short-term channel.
  • the matrix codebook used is represented in the form of a finite number of matrix sets, and for the UE and the base station, each matrix is known.
  • One of the matrices can be a fixed matrix without feedback. This is equivalent to degenerating to single codebook feedback (possibly in the case of high rank and low rank uncorrelated channels).
  • the feedback of the channel information is based on the structure of the dual codebook, and can be described as follows: For one subband or multiple joint subbands that need to feed back channel information, the UE feeds back two PMI information to the base station (in some cases, it is not necessarily simultaneous feedback) Predefine a PMI to a fixed value, no feedback), respectively PMI1 and PMI2, where PMI1 corresponds to codeword W1 in one codebook CI, and PMI2 corresponds to codeword W2 in another codebook C2.
  • the base station has the same information of C1 and C2.
  • W2 Obtain channel information W.
  • the above dual codebook design criteria is a specific codebook form in LTE-A. In the specific implementation, only the codebook corresponding to W1 and W2 needs to be defined, but there is actually a virtual W corresponding codebook. Many performance considerations in the design are considered based on the codebook corresponding to W. Further, the design of the codebook feedback has two important parts. The first important part is the specific structure, overhead and specific codeword of W, which is directly related to the performance of the dual codebook feedback (although the specific defined feedback form is feedback).
  • This method is actually equivalent to the dual codebook dual PMI.
  • the only difference is that two codebooks C 1 and C2 are no longer defined in this method. Instead, the W code corresponding to the dual codebook and its functional relationship is defined.
  • the virtual codebook is replaced by the actual definition of CI, C2 in the LTE-A supports the SU/MU transmission mode, in the broadband/multi-subband channel information that needs feedback, the channel information that may need to be transmitted has RI, PMI And CQI, where the PMI information may include PMI1 and PMI2.
  • two precoding indicators of PMI1 and PMI2 need to be fed back, which makes the original transmission channel state of only one PMI value transmitted in the PUSCH channel.
  • a main object of the present invention is to provide a channel state information feedback method and a terminal to solve the above problem that the method for feeding back channel state information in the related art has a relatively large overhead, resulting in system performance degradation.
  • An aspect of the present invention provides a channel state information feedback method, including: a terminal acquiring channel state information, where the channel state information includes: channel quality indication information CQI, precoding matrix Indicator information (PMI) and rank indicator information (RI); in an eight-antenna system, the PMI includes a first type of precoding indicator (PMI1) and a second type of precoding indicator (PMI2); in a four-antenna system
  • the PMI includes a single PMI; the terminal feeds back channel state information according to a predetermined feedback method on the uplink physical shared channel (PUSCH).
  • the terminal feeds back channel state information on the PUSCH according to a predetermined feedback method, including:
  • the channel state information is fed back on the PUSCH channel according to one of the following feedback methods: feedback wideband channel information, PMI of each subband on M subbands, CQI and RI of each subband on M subbands; feedback wideband channel information, M subbands PMI2 of each subband, CQI and RI of each subband on M subbands; feedback of wideband channel information, PMI of each subband on M subbands, joint CQI and RI on M subbands; feedback wideband channel information, M The subband carries the PMI2 of each subband, the joint CQI and RI on the M subbands; where M is less than the number of subbands included in the system bandwidth.
  • the M subbands are non-continuous subbands.
  • the terminal feeding back channel state information according to a predetermined feedback method on the PUSCH includes: the terminal feeds back channel state information on the PUSCH channel according to one of the following feedback methods: feedback wideband channel information, joint PMI on M subbands, joint on M subbands CQI and rank indicator information RI; feedback wideband channel information, joint PMI2 over M subbands, joint CQI and RI over M subbands; feedback wideband channel information, PMI for each subband on M subbands, M subbands CQI and RI of each subband; feedback wideband channel information, PMI2 of each subband on M subbands, CQI and RI of each subband on M subbands; feedback wideband channel information, PMI of each subband on M subbands, Joint CQI and RI on M subbands; feedback wideband channel information, PMI2 of each subband on M subbands, joint CQI and RI on M subbands; where M
  • the above M sub-bands are continuous sub-bands.
  • the wideband channel information includes one of the following and a combination thereof: a wideband CQI, a single PMI over a wideband bandwidth, PMI1.
  • a terminal including: an acquiring module, configured to acquire channel state information, where the channel state information includes: channel quality indication information CQI, precoding matrix indicator information (PMI), and a rank indicator Information (RI), in an eight-antenna system, the PMI includes a first type of precoding indicator (PMI1) and a second type of precoding indicator (PMI2).
  • the PMI includes a single PMI; a feedback module, setting Channel state information is fed back in accordance with a predetermined feedback method on the uplink physical shared channel PUSCH.
  • the feedback module includes: a first information feedback submodule, configured to feed back channel state information on the PUSCH according to one of the following feedback methods: feedback wideband channel information, PMI of each subband on M subbands, and each subband on M subbands CQI and RI; feedback wideband channel information, PMI2 of each subband on M subbands, CQI and RI of each subband on M subbands; feedback wideband channel information, PMI of each subband on M subbands, M subbands Joint CQI and RI; feedback wideband channel information, PMI2 of each subband on M subbands, joint CQI and RI of M subbands; where M is less than the number of subbands included in the system bandwidth.
  • the M subbands are non-continuous subbands.
  • the feedback module includes: a second information feedback submodule, configured to feed back channel state information on the PUSCH according to one of the following feedback methods: feedback wideband channel information, joint PMI on M subbands, joint CQI and RI on M subbands Feedback wideband channel information, joint PMI2 over M subbands, joint CQI and RI over M subbands; feedback wideband channel information, PMI for each subband on a subband, CQI and RI for each subband on a subband Feedback wideband channel information, ⁇ 2 of each subband on a subband, CQI and RI of each subband on a subband; feedback wideband channel information, PMI of each subband on a subband, joint CQI on a subband And RI; feedback wideband channel information, ⁇ 2 of each subband on a subband, joint CQI and RI on the subbands; where ⁇ is less than the number of subbands included in the system
  • the sub-bands are contiguous sub-bands.
  • the wideband channel information includes one of the following and a combination thereof: a wideband CQI, a PMI over a wideband bandwidth, and a PMI1.
  • the terminal acquires channel state information, where the channel state information includes: channel quality indication information CQI, precoding matrix indicator information (PMI), and rank indicator information (RI), in the eight antenna system, the PMI
  • the PMI includes a single PMI, and uses a predetermined feedback mode to feed back channel state information, which solves the problem that the channel information feedback method in the related art has a relatively large overhead, thereby improving feedback accuracy, and further Improve the performance of the communication system.
  • FIG. 1 is a flowchart of a channel state information feedback method according to an embodiment of the present invention
  • FIG. 2 is a flowchart of a channel state information feedback method according to a preferred embodiment of the present invention
  • FIG. 3 is a structural block diagram of a terminal according to an embodiment of the present invention
  • 4 is a block diagram showing a preferred configuration of a terminal according to an embodiment of the present invention
  • FIG. 1 is a flowchart of a channel state information feedback method according to an embodiment of the present invention
  • FIG. 2 is a flowchart of a channel state information feedback method according to a preferred embodiment of the present invention
  • FIG. 3 is a structural block diagram of a terminal according to an embodiment of the present invention
  • 4 is a block diagram showing a preferred configuration of a terminal according to an embodiment of the present invention
  • FIG. 1 is a flowchart of a channel state information feedback method according to an embodiment of the present invention. As shown in FIG.
  • Step S102 The terminal acquires channel state information,
  • the channel state information includes: channel quality indication information (CQI), precoding matrix indicator information (PMI), and rank indicator information (RI); wherein, in the eight antenna system, the PMI includes PMI1 and PMI2, and four antennas In the system, the PMI includes a single PMI.
  • Step S104 The terminal feeds back channel state information on the PUSCH according to a predetermined feedback method.
  • the terminal acquires the channel state information, and feeds back the channel state information according to the predetermined feedback method on the PUSCH, which overcomes the problem that the channel information feedback method in the related art has a relatively large overhead, improves the feedback precision, and improves the performance of the communication system.
  • step S104 The terminal feeds back channel state information on the PUSCH channel according to one of the following feedback methods: feedback wideband channel information, PMI of each subband on M subbands, CQI and rank indicator information (RI) of each subband on M subbands; Feedback wideband channel information, PMI2 of each subband on M subbands, CQI and rank indicator information (RI) of each subband on M subbands; feedback wideband channel information, PMI of each subband on M subbands, M sub Combined CQI and rank indicator information (RI) on the band; feedback wideband channel information, PMI2 for each subband on M subbands, joint CQI and rank indicator information (RI) on M subbands; where M is less than the system The number of subbands included in the bandwidth.
  • feedback wideband channel information, PMI of each subband on M subbands, CQI and rank indicator information (RI) of each subband on M subbands feedback wideband channel information, PMI of each subband on M subbands, CQI and
  • the terminal retrieves the channel information by using the feedback mode to improve feedback accuracy.
  • the M sub-bands are non-contiguous sub-bands.
  • step 4 S S 104 is described below.
  • the terminal feeds back channel state information on the PUSCH channel according to one of the following feedback methods: feedback wideband channel information, joint PMI on M subbands, joint CQI and rank indicator information (RI) on M subbands; feedback wideband channel information , joint PMI2 on M subbands, joint CQI and rank indicator information (RI) on M subbands; feedback wideband channel information, PMI of each subband on M subbands, CQI of each subband on M subbands Rank indicator information (RI); feedback wideband channel information, PMI2 of each subband on M subbands, CQI and rank indicator information (RI) of each subband on M subbands; feedback wideband channel information, M subbands PMI for each subband, joint CQI and rank indicator information (RI) on M subbands; feedback wideband channel information, PMI2 for each subband on M subbands, joint CQI and rank indicator information (RI) on M subbands ( RI ); where M is less than the number of subbands included in the system
  • the terminal retrieves the channel information by using the feedback mode to improve feedback accuracy.
  • the M subbands in the above method are contiguous subbands.
  • the wideband CQI may comprise a differential CQI, wherein the differential CQI is one of: a differential CQI between codeword streams; preferably, when there are two codes In the case of a word stream, the wideband CQI of the second codeword stream is based on the differential CQI of the first codeword stream wideband CQI.
  • the CQI of each subband on the M subbands may be a differential CQI, wherein the differential CQI is one of: a differential CQI based differential CQI; a differential CQI based on one of the subband CQIs; a joint CQI based on M subbands Differential CQI; differential CQI between different codeword streams; in particular, when there are two codeword streams, the subband CQI of the second codeword stream is based on the corresponding subband CQI of the first codeword stream Differential CQI.
  • the differential CQI is one of: a differential CQI based differential CQI; a differential CQI based on one of the subband CQIs; a joint CQI based on M subbands Differential CQI; differential CQI between different codeword streams; in particular, when there are two codeword streams, the subband CQI of the second codeword stream is based on the corresponding subband CQI of the
  • the joint CQI on the M subbands may be a differential CQI, wherein the differential CQI is one of: a wideband CQI based differential CQI; a differential CQI between different codeword streams; when there are two codeword streams,
  • the joint CQI of the M subbands of the second codeword stream is a differential CQI based on the joint CQI of the M subbands of the first codeword stream.
  • the CQI is transmitted in a differential manner, which reduces overhead and improves accuracy.
  • Embodiment 1 This embodiment combines the foregoing embodiments and preferred embodiments thereof. This embodiment provides a method for feeding back channel state information.
  • Step S202 The UE determines CQI, PMI, and RI according to channel information, where the PMI may include PMI1 and PMI2.
  • step S204 the UE reports the channel state information to the base station on the PUSCH according to the downlink control signaling or the random access information (ARP) reporting of the aperiodic channel information.
  • ARP random access information
  • the UE feeds back channel state information to the base station on a physical uplink shared channel (PUSCH) according to a predetermined feedback method.
  • PUSCH physical uplink shared channel
  • the UE may perform feedback according to the following feedback method in step S204.
  • the feedback method includes: feeding back wideband channel information, PMI or PMI2 of each subband on M subbands, and CQI and rank indicator information (RI) of each subband on M subbands; or, feeding back broadband channel information, M subbands CQI and rank indicator information (RI ) of PMI or PMI2 and M subbands of each subband; wherein CQI may also be differential CQI; wherein differential CQI may be differential CQI with respect to subband, or may be relative to broadband The differential CQI; wherein the wideband channel information may include a CQI over the entire bandwidth or a PMI or PMI1 over the entire bandwidth.
  • the UE may perform feedback according to the following feedback method in step S204.
  • the feedback method includes: feeding back wideband channel information, CQI on M subbands, and PMI or PMI2 and rank indicator information (RI) on M subbands; or, feeding back wideband channel information, PMI of each subband on M subbands or PMI2 and feedback CQI and rank indicator information (RI) of each subband on the M subband; or, feedback wideband channel information, PMI or PMI of each subband on M subbands, CQI and rank indication on feedback M subbands
  • the information (RI); wherein the CQI may also be a differential CQI; wherein the differential CQI may be a differential CQI with respect to a subband, or may be a differential CQI with respect to a wideband; wherein the wideband channel information may include a CQI over the entire bandwidth or And PMI or PMI1 over the entire bandwidth.
  • the application of the PMI enhancement technology is adapted, the feedback precision is improved, and the feedback overhead is reduced, thereby significantly improving the system performance.
  • the feedback structure using the dual codebook and the dual PMI mode and the feedback structure using the single codebook and the dual PMI method equivalent to the dual codebook have the same meaning.
  • Various embodiments of the present application can be used for both feedback structures simultaneously.
  • Embodiment 2 In the case of eight antenna transmission, the feedback structure of the PMI is dual codebook, dual PMI feedback or single codebook, dual PMI feedback, and the channel state information includes channel quality indication information CQI, precoding matrix indicator information (PMI), and Rank indicator information (RI).
  • the PMI information includes a first type of precoding matrix indicator information (PMI1) and a second type of precoding matrix indicator information (PMI2) due to the application of the eight antenna enhancement technique.
  • the channel state information feedback by the UE includes the following steps: Step 1: Determine the channel quality according to the channel information.
  • Step 2 According to the downlink control signaling or the random access response, the random access response Grant
  • the periodic channel information reporting triggering instruction reports the channel state information to the base station on the PUSCH.
  • the user terminal UE feeds back the channel state information to the base station according to the following feedback method on the physical uplink shared channel (PUSCH).
  • PUSCH physical uplink shared channel
  • the method includes: (1) the UE determines the broadband channel information, and reports the information to the base station; wherein the broadband channel information may include the broadband PMI1 and the wideband CQI; the UE determines the PMI2 information of each of the M subbands, and sends the PMI2 information to the base station; Determining M sub-band CQI information of each codeword stream, and transmitting the information to the base station; the UE determines the rank indicator information (RI), and reports the information to the base station;
  • the wideband CQI information of the second codeword stream may be a differential CQI relative to the first codeword stream CQI information; wherein, when the number of codeword streams is 1,
  • the CQI information of the M subbands may be an absolute CQI value, or may be a differential CQI with respect to the wideband CQI information; wherein, when the number of codeword streams is greater than 1, the CQI information of the M subbands of the second codeword stream may be The
  • the UE determines the broadband channel information and reports it to the base station; wherein the wideband channel information may include the broadband PMI1 and the wideband CQI; the UE determines the PMI2 information of each of the M subbands and reports the information to the base station; the UE determines each code.
  • the CQI information of each of the M subbands of the word stream is reported to the base station; the UE determines the RI and reports it to the base station; wherein, when the number of codeword streams is greater than 1, the broadband CQI information of the second codeword stream
  • the CQI information of each sub-band in the M sub-bands may be an absolute CQI value, or may be a relative bandwidth, when the number of codeword streams is 1.
  • the channel state information includes channel quality indication information (CQI), precoding matrix indicator information (PMI), and rank indicator information ( RI).
  • the UE performs channel state information feedback, and includes the following steps: Step 1: Determine the CQI according to the channel information. PMI and RI; Step 2: The channel state information is reported to the base station on the PUSCH according to the downlink control signaling or the aperiodic channel information reporting trigger indication of the random access response grant.
  • Step 2 the user terminal UE is in the physical uplink shared channel according to the following feedback method.
  • the feedback method includes:
  • the UE determines the broadband channel information and feeds back to the base station; wherein the wideband channel information may include a wideband CQI or may include a wideband PMI and wideband CQI information; the UE determines PMI information of each of the M subbands, and The UE determines the M subband CQI information of each codeword stream, and reports the information to the base station; the UE determines the rank indicator information (RI) and reports it to the base station; wherein, when the number of codeword streams is greater than 1, The wideband CQI information of the two codeword streams may be a differential CQI relative to the first codeword stream CQI information; wherein, when the number of codeword streams is 1, the CQI information of the M subbands may be an absolute CQI value, And may be a differential CQI with respect to the wideband CQI information; wherein, when the number of codeword streams is greater than 1, the CQI information of the M subbands of the second codeword stream may be relative to the first code
  • the UE determines the broadband channel information and feeds back to the base station; wherein the wideband channel information may include a wideband CQI or may include a wideband PMI and wideband CQI information; the UE determines PMI information of each of the M subbands, and The UE determines the CQI information of each of the M subbands of each codeword stream, and reports the information to the base station; the UE determines the rank indicator information (RI) and reports it to the base station; wherein, the number of codeword streams When greater than 1, the wideband CQI information of the second codeword stream may be a differential CQI relative to the first codeword stream CQI information; wherein, when the number of codeword streams is 1, each of the M subbands The CQI information may be an absolute CQI value or a differential CQI with respect to the wideband CQI information; wherein, when the number of codeword streams is greater than 1, the CQI information of each of the M subbands of the second codeword stream may be
  • channel state information includes channel quality indication information (CQI), precoding matrix indicator information (PMI), and rank indicator information (RI).
  • CQI channel quality indication information
  • PMI precoding matrix indicator information
  • RI rank indicator information
  • the PMI information includes a first type of precoding matrix indicator information (PMI1) and a second type of precoding matrix indicator information (PMI2).
  • Step 1 determining channel quality indication information by using channel information ( CQI), PMI1 and PMI2 and
  • Step 2 Report the triggering indication according to the downlink control signaling or the aperiodic channel information of the Random Access Response Grant, and report the channel state information to the base station on the PUSCH.
  • the UE feeds back channel state information to the base station on the physical uplink shared channel (PUSCH) according to the following feedback method.
  • the feedback method includes:
  • the UE determines the broadband channel information and reports it to the base station; wherein the wideband channel information may include the broadband PMI1 and the wideband CQI; the UE determines the PMI2 information of each of the M subbands, and The UE determines the M sub-band CQI information of each codeword stream, and sends the CQI information to the base station; the UE determines the RI and reports it to the base station; wherein, when the number of codeword streams is greater than 1, the second code
  • the wideband CQI information of the word stream may be a differential CQI with respect to the CQI information of the first codeword stream; wherein, when the number of codeword streams is 1, the CQI information of the M subbands may be an absolute CQI value, or may be a relative The differential CQI of the wideband CQI information; wherein, when the number of codeword streams is greater than 1, the CQI information of the M subbands of the second codeword stream may be M subband CQI information relative
  • the UE determines the broadband channel information and reports it to the base station; wherein the wideband channel information may include the broadband PMI1 and the wideband CQI; the UE determines the PMI2 information of each of the M subbands and reports the information to the base station; the UE determines each code.
  • the CQI information of each of the M subbands of the word stream is reported to the base station; the UE determines the RI and reports it to the base station; wherein, when the number of codeword streams is greater than 1, the broadband CQI information of the second codeword stream
  • the CQI information of each sub-band in the M sub-bands may be an absolute CQI value, or may be a relative bandwidth, when the number of codeword streams is 1.
  • a differential CQI of the CQI information wherein, when the number of codeword streams is greater than 1, the CQI information of each of the M subbands of the second codeword stream may be relative to the M subbands of the first codeword stream.
  • a differential CQI of CQI information of each subband; or, CQI information of each of the M subbands of all codeword streams or partial codeword streams is a differential CQI with respect to wideband CQI information;
  • the UE determines the broadband channel information and reports it to the base station; wherein, the broadband channel information may include the broadband PMI1 and the wideband CQI; the UE determines the PMI2 information of the M subbands, and sends the information to the base station;
  • the UE determines the M subband CQI information of each codeword stream, and reports the information to the base station; the UE determines the RI and reports it to the base station; wherein, when the number of codeword streams is greater than 1, the broadband CQI information of the second codeword stream
  • the CQI information of the M subbands may be an absolute CQI value or a difference with respect to the wideband CQI information when the number of the codeword streams is 1.
  • the channel state information includes channel quality indication information CQI, PMI, and RI.
  • the UE performs channel state information feedback, including the following steps: Step 1: Determine the CQI, PMI, and RI according to the channel information. Step 2: Report the trigger indication on the non-periodic channel information of the downlink control signaling or the random access response Grant, on the PUSCH.
  • the channel status information is reported to the base station.
  • the UE feeds back channel state information to the base station on the physical uplink shared channel (PUSCH) according to the following feedback method.
  • the feedback method includes:
  • the UE determines the broadband channel information and feeds back to the base station; wherein the wideband channel information may include a wideband CQI or may include a wideband PMI and wideband CQI information; the UE determines PMI information of each of the M subbands, and The UE determines the M subband CQI information of each codeword stream, and reports the information to the base station; the UE determines the RI and reports it to the base station; wherein, when the number of codeword streams is greater than 1, the second codeword stream
  • the wideband CQI information may be a differential CQI relative to the first codeword stream CQI information; wherein, when the number of codeword streams is 1, the CQI information of the M subbands may be an absolute CQI value, or may be a relative CQI a differential CQI of the information; wherein, when the number of codeword streams is greater than 1, the CQI information of the M subbands of the second codeword stream may be a differential CQI of the M
  • the UE determines the broadband channel information and feeds back to the base station; wherein the wideband channel information may include a wideband CQI or may include a wideband PMI and wideband CQI information; the UE determines PMI information of each of the M subbands, and sends the PMI information to the base station.
  • the wideband channel information may include a wideband CQI or may include a wideband PMI and wideband CQI information
  • the UE determines PMI information of each of the M subbands, and sends the PMI information to the base station.
  • the UE determines the CQI information of each of the M subbands of each codeword stream, and reports the information to the base station; the UE determines the RI and reports it to the base station; wherein, when the number of codeword streams is greater than 1, the second The wideband CQI information of the codeword stream may be a differential CQI relative to the first codeword stream CQI information; wherein, when the number of codeword streams is 1, the CQI information of each of the M subbands may be an absolute CQI value.
  • the CQI information of each of the M subbands of the second codeword stream may be relative to the first code
  • the differential CQI of the CQI information of each of the M subbands of the word stream; or, the CQI information of each of the M subbands of all the codeword streams or partial codeword streams is a differential CQI with respect to the wideband CQI information.
  • the UE determines the wideband channel information and feeds back to the base station; wherein the wideband channel information may include the wideband CQI or may include the broadband PMI and the wideband CQI information; the UE determines the PMI information of the M subbands and reports the information to the base station; the UE determines each M sub-band CQI information of one codeword stream, and reported to the base.
  • the UE determines the RI and sends the uplink to the base station; wherein, when the number of codeword streams is greater than 1, the wideband CQI information of the second codeword stream may be a differential CQI relative to the first codeword stream CQI information.
  • the CQI information of the M subbands may be an absolute CQI value, or may be a differential CQI with respect to the wideband CQI information; wherein, when the number of codeword streams is greater than 1,
  • the CQI information of the M subbands of the two codeword streams may be a differential CQI of M subband CQI information relative to the first codeword stream; or CQI information of M subbands of all codeword streams or partial codeword streams Is the differential CQI relative to the wideband CQI information.
  • the present embodiment provides a terminal.
  • FIG. 3 is a structural block diagram of a terminal according to an embodiment of the present invention. As shown in FIG.
  • the terminal includes: an obtaining module 32, and a feedback module 34.
  • the flute description module is configured to acquire channel state information, where the channel state information includes: CQI, PMI, and RI.
  • the PMI includes PMI1 and PMI2, and in the four antenna system, the PMI includes a single PMI.
  • the feedback module 34 is coupled to the acquisition module 32 and configured to feed back channel state information on the PUSCH according to a predetermined feedback method.
  • 4 is a structural block diagram of a terminal according to an embodiment of the present invention. As shown in FIG. 4, the feedback module 34 includes: a first information feedback sub-module 42 and a second information feedback sub-module 44.
  • the first information feedback sub-module 42 is configured to feed back channel state information on the PUSCH according to one of the following feedback methods: feedback wideband channel information, PMI of each subband on M subbands, and subbands of each of the M subbands
  • the second information feedback sub-module 44 is configured to feed back channel state information on the PUSCH according to one of the following feedback methods: feedback wideband channel information, joint PMI on M subbands, joint CQI and RI on M subbands; feedback broadband Channel information, joint CQI and RI on joint PMI 2M subbands on M subbands; feedback wideband channel information, PMI for each subband on M subbands, CQI and RI for each subband on M subbands; feedback wideband channel information , M subbands on each subband of PMI2, M subbands per CQI and RI of subbands; feedback wideband channel information, PMI of each subband on M subbands, joint CQI and RI on M subbands; feedback wideband channel information, PMI2, M subbands of each subband on M subbands Joint CQI and RI; where M is less than the number of subbands included in the system bandwidth.
  • the M sub-bands in the feedback method in the first information feedback sub-module 42 are non-contiguous sub-bands.
  • the M subbands in the feedback method in the second information feedback submodule 44 are contiguous subbands.
  • the embodiment of the present invention further provides a terminal, which is configured to feed back channel state information to the base station according to the indication information.
  • the terminal includes an information determining module 52 and an information feedback module 54.
  • the information determining module 52 is configured to determine channel quality indication information CQI, PMI and RI according to the channel information.
  • the information determining module 52 is instructed to determine the feedback method, and then transmits the channel state information to the base station according to the feedback method.
  • the information feedback module 54 is connected to the information determining module 52, and is configured to send the channel state information calculated by the information determining module 52 to the base station according to the indication information according to the feedback method.
  • the indication information is high layer configuration signaling information sent by the base station.
  • the information determining module 52 is arranged to determine the RI according to the indication information; the information feedback module 54 transmits the RI of the information determining module determination 52 to the base station.
  • the information determining module 52 can determine the CQI and the PMI according to the latest RI information.
  • the CQI may include a wideband CQI and M subband CQIs or CQIs for each of the M subbands
  • the PMI may include PMI1 and PMI2.
  • PMI1 in the above embodiment may also be represented as il
  • PMI2 may also be represented as 12.
  • the terminal described in the foregoing embodiment corresponds to the foregoing method embodiment, and the specific implementation process has been described in detail in the method embodiment, and is not described herein.
  • a channel state information feedback method and terminal are provided.
  • the terminal determines the channel state information according to the channel information, selects a corresponding feedback mode according to the reporting manner, and uses the feedback mode to feed back the channel state information, thereby solving the problem that the system information performance is relatively poor due to the relatively large channel information feedback method in the related art, thereby Improved feedback accuracy and performance of the communication system.
  • the above modules or steps of the present invention can be implemented by a general-purpose computing device, which can be concentrated on a single computing device or distributed over a network composed of multiple computing devices. Alternatively, they may be implemented by program code executable by the computing device, such that they may be stored in the storage device by the computing device and, in some cases, may be different from the order herein.

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Description

信道状态信息反馈方法及终端 技术领域 本发明涉及通信领域,具体而言, 涉及一种信道状态信息反馈方法及终端。 背景技术 无线通信***中, 发送端和接收端釆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 ( Single User Multi-input Multi-output, 简称为 SU-MIMO )中, 直接使用信道特征矢量信息进行预编码, 对于多用户多输入多输出 (Multiple User Multi-input Multi-output, MU-MIMO ) 中, 需要比较准确的信道信息指导多用户预编码。 在第三代合作伙伴计划 ( 3rd Generation Partnership Project, 简称为 3GPP ) 长期演进( Long Term Evolution, 简称为 LTE ) 计划中, 信道信息的反馈主要 是利用较简单的单一码本的反馈方法,而 MIMO的发射预编码技术的性能依赖 于其中码本反馈的准确度。 基于码本的信道信息量化反馈的基本原理如下: 假设有限反馈信道容量为 bps/Hz, 那么可用的码字的个数为 ^ = 2β个。 信道矩阵的特征矢量空间经过量化构成码本空间 = {FlF217 。发射端与接 收端共同保存或实时产生此码本 (发射端和收收端相同)。 对需要反馈 CSI (信道状态信息) 的信道 H, 接收端根据一定准则从码本空间 中选择一个与 实际信道 H最匹配的码字 , 并将该码字 的序号 ζ' (码字序号) 反馈回发射 端。 这里, 码字序号称为码本中的预编码矩阵指示符 ( Precoding Matrix
Indicator, 简称为 PMI )。 发射端根据此序号 z '找到相应的预编码码字 , 从而 也获得相应的信道信息, 表示了信道的特征矢量信息。 一般来说, 码本空间 可以进一步地被划分为多个 Rank对应的码本, 每 个 Rank下会对应多个码字来量化该 Rank下信道特征矢量构成的预编码矩阵。 由于信道的 Rank和非零特征矢量个数是相等的, 因此, 一般来说 Rank为 N 时码字都会有 N列。 所以, 码本空间 ^可按 Rank的不同分为多个子码本, 如 表 1所示。 表 1 码本按 Rank分为多个子码本示意图
Figure imgf000004_0001
其中, 在 Rank>l时需要存储的码字都为矩阵形式, 其中 LTE协议中的码 本就是釆用的这种码本量化的反馈方法, LTE下行 4发射天线码本如表 2所示 下, 实际上 LTE中预编码码本和信道信息量化码本含义是一样的。 为了统一起 见, 矢量也可以看成一个维度为 1的矩阵。 表 2 LTE下行 4发射天线码本示意表
Figure imgf000004_0002
Figure imgf000005_0001
其中, Wn = I— 2Un / Un , I 为单位阵, 表示矩阵 ^的第 _/列矢量。
W l'h 表示矩阵 ^的第 … 列构成的矩阵, 表示 M "的共轭转置矩阵; 其中, n表示序号, 取值为 0〜15。 在 LTE的标准中, 信道信息的最小反馈单位是子带(Subband ), —个子带 由若千个资源块 ( Resource Block, 简称为 RB ) 组成, 每个 RB由多个资源单 元( Resource Element , 简称为 RE )组成; RE为 LTE中时频资源的最小单位。 UE反馈信道信息时对应的对象可以是子带 ( Multi - Subband ), 或者是多个子 带, 以及宽带 ( Wideband )。 RB、 子带 Subband和宽带 Wideband的具体粒度 的定义在十办议 36.213中有明确的规定。
LTE中存在很多传输模式和反馈模式, 几种主要的传输模式如下: 模式 1 : 单天线端口: 端口 0 ( Single-antenna port: port 0 ); 模式 2: 发射分集 ( Transmit diversity ); 模式 3: 开环空间复用 ( Open-loop spatial multiplexing ); 模式 4: 闭环空间复用 ( Closed-loop spatial multiplexing ); 模式 5: 多用户多输入多输出 ( Multi-user MIMO ); 模式 6: 闭环 Rank=l预编码 ( Closed-loop Rank=l precoding ); 模式 7: 单¾¾ beamforming: 端口 5 ( Single-antenna port: port 5 )。 不同的传输模式下有不同的反馈模式和反馈内容, 在 LTE中, 闭环空间复 用的传输模式下的反馈模式和反馈方法。 其它传输模式下的反馈方法和内容一 般为闭环空间复用的传输模式的简化。 空间复用时, 上行信道信息的反馈内容主要有三种: PMI信息, 表征特征矢量信息, 推荐给基站, 用于下行预编码技术。 如表 1所示, PMI是一个指示表 1码本中某个码字的索引, 指示的码字用 于表征特征矢量信息。
RI信息, 表征信道的秩, 推荐给基站作为下行支持的层数。 LTE时最大支 持 RI = 4。
CQI信息,表征信道的质量信息, 以推荐的调制编码方式来表征信道质量, 越高阶的调制编码方式表示性能越好, LTE*** 16种 CQI等级选择。 以上这些重要的信道信息: PMI/RI/CQI在上行的反馈类型分为以下两种: 周期反馈, 主要承载在上行控制信道 PUCCH上的反馈。 非周期反馈, 承载在上行共享信道 PUSCH上的反馈 周期反馈是必须配置的, 非周期反馈是不定期触发型的反馈, 在 PUSCH 上的非周期反馈, 是一种精度较高的反馈, 属于辅助的, 用于提高精度的反馈。 表 3 非周期的反馈模式表
Figure imgf000006_0001
其中,表 3中 Mode x-y中, x表示 CQI的反馈, 1为 Wideband CQI的反馈, 2为 Subband CQI反馈, 3为高层配置的 CQI反馈。 y表示 PMI反馈, 0为无 PMI, 1为 single PMI, 2为多个 PMI。 闭环空间复用总是支持有 PMI的反馈, 所以其支持的 PUSCH上的反馈模 式为: Modes 1-2, 2-2, 3-1。 Modes 1-2: 针对每个 Subband, 都反馈 1个 PMI; 针对整个带宽反馈反馈 CQL
Modes 2-2: 反馈一个宽带 CQI , 和一个宽带 PMI; 反馈 M个较好子带的 位置信息; M个子带的联合 CQI; M个子带的联合 PMI; Modes 3-1 : 高层配置的带宽范围 S个子带内; 反馈上述带宽范围 S个子 带的联合 CQI和联合 PMI; 反馈各子带单独的 CQI。 在实际的反馈中, RI也与上述的 CQI信息和 PMI信息在同一个 PUSCH 的子帧内反馈。 RI被限制为 1 ~ N 的范围内的一个数值, N = min ( Nt, Nr ) Nt表示发射天线数, Nr表示接收天线数。 CQI的反馈在含义上主要分为子带 CQI和宽带 CQI,也就是多个子带的联 合 CQI。其含义分别是假设下行使用一个子带传输能支持的 CQI等级和假设下 行使用多个子带共同传输能支持的 CQI等级。 另外针对同样资源单位的 CQI可以为 1个或 2个。 主要与 RI有关, RI = 1 时为 1个 CQI, RI > 1时为 2个 CQI。 1个 CQI时为 4bit, 反馈 2个 CQI时, 第 2个 CQI使用差分技术, 基于第 1个 CQI差分, 为 3bit。 最大为 l ibit, 这 也是 PUCCH上反馈时 CSI信息的最大可支持的开销。
CQI为衡量下行信道质量好坏的一个指标。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。 在开环空间复 用和闭环空间复用模式下, 需要 UE反馈 RI信息, 其他模式下不需要反馈 RI 信息。
PMI指 UE反馈的预编码码本的索引号。 在闭环空间复用、 MU-MIMO、 RI=1的闭环这 3种模式下, 需要反馈 PMI信息, 其他发射模式下不反馈 PMI 信息。 具体来说, LTE 中出现的 CQI定义繁多, 才艮据不同的原则, 可以将 CQI 进行划分: 才艮据测量带宽分为宽带 CQI ( wideband CQI ) 和子带 CQI ( subband CQI ) wideband CQI指对所有的 subband的信道状态指示, 得到的是 subband集 合 S的 CQI信息; subband CQI指针对每一个子带的 CQI信息。 LTE根据不同的***带宽, 将有效带宽对应的 RB ( Resource Block, 资源块) 分成了若千个 RB组, 每一 个 RB组称之为 subband, 即子带。 subband CQI又可以分为全 subband CQI和 Best M CQI: 全 subband CQI 上报所有子带的 CQI信息; Best M CQI是从子带集合 S中挑选 M个子带, 上 艮这 M个子带的 CQI信息, 并同时上 4艮 M个子带的位置信息。 根据码流个数分为单流 CQI和双流 CQI。 单流 CQI: 应用于单天线发射 port 0, port 5、发射分集、 MU-MIMO、 RI=1 的闭环空间复用, 此时 UE上 4艮单个码流的 CQI信息; 双流 CQI: 应用于闭环空间复用模式。 对于开环空间复用模式, 由于信道 状态信息未知, 且在预编码中对双流信道信息进行了均衡处理, 因此开环空间 复用下, 2个码流的 CQI是相等的。 根据 CQI表示方法分为绝对值 CQI和差分 CQI ( Differential CQI ) 绝对值 CQI即用 4 bit表示的 CQI 索引 ( CQI index ); 差分 CQI ( Differential CQI ) 用 2bit或 3bit表示的 CQI index; 差分 CQI 又分为第 2个码流相对于第 1个码流的差分 CQI、 subband CQI相对于 subband CQI的差分 CQI和 suband CQI相对于宽带 CQI的差分 CQI。 才艮据 CQI上 4艮方式分为 wideband CQI、 UE selected ( subband CQI ), High layer configured ( subband CQI ) wideband CQI指 subband集合 S的 CQI信息;
UE selected ( subband CQI )即 Best M CQI,反馈所选择的 M个子带的 CQI 信息, 同时上 4艮 M个子带的位置; High layer configured ( subband CQI ) 即全 subband CQI, 4十对每一个子带 反馈一个 CQI信息。 High layer configured和 UE selected均是子带 CQI的反馈方式, 在非周期 反馈模式下, 这两种反馈方式定义的子带大小不一致; 在 UE selected模式下, 还定义了 M的大小, 见表 2和表 3。 表 4 子带大小 (高层配置模式)
Figure imgf000009_0001
表 5 子带大小和 M值对应关系表 (用户选择模式)
Figure imgf000009_0002
LTE***中, CQI/PMI, RI的反馈可以是周期性的反馈, 也可以是非周期 性的反馈, 具体的反馈如表 6所示: 表 6 周期性反馈和非周期性反馈对应的上行物理信道
Figure imgf000009_0003
其中, 对于周期性反馈的 CQI/PMI、 RI而言, 如果 UE不需要发送数据, 则周期反馈的 CQI/PMI、 RI 在物理上行控制信道 ( Physical Uplink Control Channel, 简称为 PUCCH ) 上以格式 2/2a/2b ( PUCCH format2/2a/2b ) 传输, 如果 UE需要发送数据时,则 CQI/PMI, RI在物理上行共享信道( Physical Uplink Shared Channel, 简称为 PUSCH ) 中传输; 对于非周期性反馈的 CQI/PMI、 RI 而言, 只在 PUSCH上传输。 在 LTE-A***中, 信道^ I 态信息反馈可以由以下步 4聚完成: 步骤 1 : 基站向 UE发送导频, 用于 UE估计下行信道。 步骤 2: UE根据导频信号估计下行信道。 步骤 3: UE确定信道^! 态信息, 包括 RI、 PMI和 CQI。 步骤 4: UE按照反馈模式向基站反馈信道状态信息。 高级长期演进 ( Long Term Evolution Advanced, LTE-A ) ***作为 LTE的 演进标准, 支持更大的***带宽 (最高可达 100MHz ), 并后向兼容 LTE现有 的标准。 为了获得更高的小区平均谱效率及提高小区边缘的覆盖和吞吐量, LTE-A在现有的 LTE***的基础上, 下行支持到了最多 8才艮天线, 并且在码本 反馈方面提出了一些反馈增强的技术, 主要是增强码本的反馈精度和利用信道 信息的时间相关性和 /或频域相关性压缩开销。该技术能够提高演进的国际移动 通信 ( International Mobile Telecommunications- Advance , 简称为 IMT- Advance ) ***的频谱利用率、 緩解频谱资源紧缺。 同时, 考虑到 8天线时主要的应用将 是双极化的情况, 码本的设计和增强也需要充分考虑双极化信道的特征。 这种增强码本的反馈技术的主要思想是: 相对 LTE的反馈增大 PMI反馈 的开销, 且利用两个 PMI的反馈共同表示信道的状态信息, 主要包括两种实现 方式: 定义双码本和双 PMI反馈或者是定义双码本等效的单码本和双 PMI反馈 定义双码本和双 PMI反馈进一步可以描述为:
1 ) 一个子带的预编码 /反馈的结构由两个矩阵组成。
2 ) 两个矩阵中的每一个矩阵都隶属于一个单独的码本。 码本是由基站和 UE同时预先知道的。 反馈的码字可以在不同的时间和不同的子带上有所变化。 3 ) —个矩阵表示宽带或者长时信道的属性。 另一个矩阵表示确定频带上 或者短时信道的属性。
4 )所使用的矩阵码本以有限可数矩阵集的形式表示, 并且对 UE和基站而 言, 每个矩阵都是可知的。
5 ) 其中一个矩阵可以是一个固定的矩阵, 不需要反馈。 此时相当于退化 到单码本反馈 (可能在高秩和低秩的非相关信道情况下使用)。 信道信息的反馈基于双码本的结构, 可以描述为: 对于需要反馈信道信息 的一个子带或多个联合子带, UE向基站反馈两个 PMI信息 (某些情况不一定 同时反馈, 也可以预定义一个 PMI为固定值, 不进行反馈), 分别为 PMI1和 PMI2, 其中 PMI1对应一个码本 CI 中的码字 Wl , PMI2对应另外一个码本 C2中的码字 W2。 基站端有相同的 C1和 C2的信息, 收到 PMI1和 PMI2后从 对应的码本 C1和 C2中找到对应的码字 W1和 W2,并根据约定的函数规则 F, 计算 W=F ( Wl , W2 ) 获得信道信息 W。 上面的双码本设计准则是 LTE-A中的一种具体的码本形式。在具体的实现 时, 只需要定义 W1和 W2对应的码本,但实际上存在一个虚拟的 W对应的码 本, 在设计中很多性能方面的考虑都基于 W对应的码本来考虑的。 进一步的, 码本反馈的设计有两个重要部分, 第一个重要部分是 W 的具体的结构、 开销 和具体码字, 直接关系到双码本反馈的性能(虽然具体定义的反馈形式是反馈 W1和 W2, 不直接反馈 W ), 这个部分的考虑对于单码本和双码本的形式都比 较相似。 第二个重要部分是如何把 W拆分为 2个码本表示更能适应信道时域 / 频域变化的特性, 有效的节约开销。 这个属于双码本节约开销的考虑, 单码本 没有这方面的考虑。 除了上面的双码本实现方式外, 还存在一种与使用双码本、 双 PMI反馈等 价的单码本反馈方式: 定义双码本等效的单码本和双 PMI反馈。 对于 Rank = r , r为整数, 与前面的 4Tx码本不同的地方在于, 在使用 该双码本等价的单码本反馈时,反馈对应的码本中的码字需要 2个 ΡΜΙ的反馈 来表示其信息, 双码本等价的单码本一般可以表示为下表 7所示: 表 7 等价于双码本的单码本
Figure imgf000011_0001
表 7 中的 ,..为一个由' i '2共同指示的码字, 通常可
Figure imgf000012_0001
4 /32 6 /32
W {i, , i2 ) ,只需要确定' 1 '2即可。例如, r = 1时, 1 ^ = e 等价于下表 8 表 8
Figure imgf000012_0002
该方式实际上和双码本双 PMI等价,唯一不同的在于这种方法中不再定义 两个码本 C 1和 C2 , 取而代之的是定义双码本及其函数关系构成的 W对应的 码本,即虚拟码本被实际定义取代了 C I , C2 在 LTE-A中 支持 SU/MU的传输模式下, 需要反馈的宽带 /多子带信道信 息中, 可能需要传输的信道信息有 RI , PMI以及 CQI, 其中 PMI信息可能包 括了 PMI1和 PMI2 由于在 LTE-A中, 需要反馈 PMI1和 PMI2两个预编码指示符, 这使得原 有的在 PUSCH信道中只能传输一个 PMI值的传输信道状态信息反馈方法不能 适用于新的技术要求, 相关技术中将原来的 PMI内容使用 PMI 1和 PMI2进行 替换, 但是该方法由于进行信道状态信息反馈的开销比较大, 造成***性能下 降。 发明内容 本发明的主要目的在于提供一种信道状态信息反馈方法及终端 以解决上 述的相关技术中反馈信道状态信息方法的开销比较大, 造成***性能下降的问 题。 本发明的一个方面提供了一种信道状态信息反馈方法, 包括: 终端获取信 道状态信息, 其中, 信道状态信息包括: 信道质量指示信息 CQI、 预编码矩阵 指示符信息(PMI )和秩指示符信息(RI ); 在八天线***中, PMI包括第一类 预编码指示符( PMI1 )和第二类预编码指示符( PMI2 ); 在四天线***中, PMI 包括单 PMI; 终端在上行物理共享信道(PUSCH )上按照预定反馈方法反馈信 道状态信息。 终端在 PUSCH 上按照预定反馈方法反馈信道状态信息包括: 终端在
PUSCH 信道上按照如下之一的反馈方法反馈信道状态信息: 反馈宽带信道信 息, M个子带上每个子带的 PMI, M个子带上每个子带的 CQI和 RI; 反馈宽 带信道信息, M 个子带上每个子带的 PMI2, M 个子带上每个子带的 CQI和 RI; 反馈宽带信道信息, M个子带上每个子带的 PMI, M个子带上的联合 CQI 和 RI; 反馈宽带信道信息, M个子带上每个子带的 PMI2, M个子带上的联合 CQI和 RI; 其中, M小于***带宽所包含的子带个数。
M个子带为非连续子带。 终端在 PUSCH 上按照预定反馈方法反馈信道状态信息包括: 终端在 PUSCH 信道上按照以下之一的反馈方法反馈信道状态信息: 反馈宽带信道信 息, M个子带上的联合 PMI, M个子带上的联合 CQI和秩指示符信息 RI; 反 馈宽带信道信息, M个子带上的联合 PMI2, M个子带上的联合 CQI和 RI; 反 馈宽带信道信息, M个子带上每个子带的 PMI, M个子带上每个子带的 CQI 和 RI; 反馈宽带信道信息, M个子带上每个子带的 PMI2, M个子带上每个子 带的 CQI和 RI; 反馈宽带信道信息, M个子带上每个子带的 PMI, M个子带 上的联合 CQI和 RI; 反馈宽带信道信息, M个子带上每个子带的 PMI2, M个 子带上的联合 CQI和 RI; 其中, M小于***带宽所包含的子带个数。 上述 M个子带为连续子带。 宽带信道信息包括以下之一及其组合: 宽带 CQI、 宽带带宽上的单 PMI、 PMI1。 本发明的另一个方面提供了一种终端, 包括: 获取模块, 设置为获取信道 状态信息, 其中, 信道状态信息包括: 信道质量指示信息 CQI、 预编码矩阵指 示符信息(PMI )和秩指示符信息(RI ), 在八天线***中, PMI包括第一类预 编码指示符 (PMI1 ) 和第二类预编码指示符 (PMI2 ), 在四天线***中, PMI 包括单 PMI; 反馈模块, 设置为在上行物理共享信道 PUSCH上按照预定反馈 方法反馈信道状态信息。 反馈模块包括: 第一信息反馈子模块, 设置为在 PUSCH上按照以下之一 的反馈方法反馈信道状态信息: 反馈宽带信道信息, M 个子带上每个子带的 PMI, M个子带上每个子带的 CQI和 RI; 反馈宽带信道信息, M个子带上每 个子带的 PMI2, M个子带上每个子带的 CQI和 RI; 反馈宽带信道信息, M个 子带上每个子带的 PMI, M个子带的联合 CQI和 RI; 反馈宽带信道信息, M 个子带上每个子带的 PMI2, M个子带的联合 CQI和 RI; 其中, M小于***带 宽所包含的子带个数。
M个子带为非连续子带。 反馈模块包括: 第二信息反馈子模块, 设置为在 PUSCH上按照以下之一 的反馈方法反馈信道状态信息: 反馈宽带信道信息, M个子带上的联合 PMI, M个子带上的联合 CQI和 RI; 反馈宽带信道信息, M个子带上的联合 PMI2, M个子带上的联合 CQI和 RI;反馈宽带信道信息,Μ个子带上每个子带的 PMI, Μ个子带上每个子带的 CQI和 RI; 反馈宽带信道信息, Μ个子带上每个子带 的 ΡΜΙ2, Μ个子带上每个子带的 CQI和 RI; 反馈宽带信道信息, Μ个子带上 每个子带的 PMI, Μ个子带上的联合 CQI和 RI; 反馈宽带信道信息, Μ个子 带上每个子带的 ΡΜΙ2, Μ个子带上的联合 CQI和 RI; 其中, Μ小于***带宽 所包含的子带个数。
Μ个子带为连续子带。 宽带信道信息包括以下之一及其组合: 宽带 CQI、 宽带带宽上的 PMI、 PMI1。 通过本发明, 终端获取信道状态信息, 其中, 信道状态信息包括: 信道质 量指示信息 CQI、 预编码矩阵指示符信息 (PMI )和秩指示符信息 (RI ), 在八 天线***中, 所述 PMI包括 PMI 1和 PMI2 , 在四天线***中, 所述 PMI包括 单 PMI, 使用预定反馈模式反馈信道状态信息, 解决了相关技术中信道信息反 馈方法开销比较大的问题,从而提高了反馈精度,进而提高了通信***的性能。 附图说明 此处所说明的附图用来提供对本发明的进一步理解, 构成本申请的一部 分, 本发明的示意性实施例及其说明用于解释本发明, 并不构成对本发明的不 当限定。 在附图中: 图 1是 居本发明实施例的信道状态信息反馈方法的流程图; 图 2是 居本发明优选实施例的信道状态信息反馈方法的流程图; 图 3是 居本发明实施例的终端的结构框图; 图 4是才艮据本发明实施例的终端的优选的结构框图; 以及 图 5是 居本发明优选实施例的终端的结构框图。 具体实施方式 下文中将参考附图并结合实施例来详细说明本发明。 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组合。 本实施例提供了一种信道信息反馈方法, 图 1是根据本发明实施例的信道 状态信息反馈方法的流程图, 如图 1所示, 该方法包括: 步骤 S 102: 终端获取信道状态信息, 其中, 信道状态信息包括: 信道质量 指示信息 (CQI )、 预编码矩阵指示符信息 (PMI ) 和秩指示符信息 (RI ); 其 中, 在八天线***中, PMI包括 PMI1和 PMI2, 在四天线***中, PMI 包括 单 PMI。 步骤 S 104: 终端在 PUSCH上按照预定反馈方法反馈信道状态信息。 通过上述步骤, 终端获取信道状态信息, 在 PUSCH上按照预定反馈方法 反馈信道状态信息, 克服了相关技术中信道信息反馈方法开销比较大的问题, 提高了反馈精度, 从而提高了通信***的性能。 优选地, 下面对步骤 S 104 中的一个优选的实施方式进行说明。 终端在 PUSCH 信道上按照如下之一的反馈方法反馈信道状态信息: 反馈宽带信道信 息, M个子带上每个子带的 PMI, M个子带上每个子带的 CQI和秩指示符信 息(RI ); 反馈宽带信道信息, M个子带上每个子带的 PMI2, M个子带上每个 子带的 CQI和秩指示符信息 (RI ); 反馈宽带信道信息, M个子带上每个子带 的 PMI, M个子带上的联合 CQI和秩指示符信息 ( RI ); 反馈宽带信道信息, M个子带上每个子带的 PMI2, M个子带上的联合 CQI和秩指示符信息 ( RI ); 其中, M小于***带宽所包含的子带个数。 通过该优选实施例, 终端釆取上述 反馈模式对信道信息进行反馈, 提高了反馈精度。 优选地, 上述反馈方法中 M个子带为非连续子带。 优选地, 下面对步 4聚 S 104 中的另一个优选的实施方式进行说明。 终端在 PUSCH 信道上按照如下之一的反馈方法反馈信道状态信息: 反馈宽带信道信 息, M个子带上的联合 PMI, M个子带上的联合 CQI和秩指示符信息 (RI ); 反馈宽带信道信息, M个子带上的联合 PMI2, M个子带上的联合 CQI和秩指 示符信息 (RI ); 反馈宽带信道信息, M个子带上每个子带的 PMI, M个子带 上每个子带的 CQI和秩指示符信息 (RI ); 反馈宽带信道信息, M个子带上每 个子带的 PMI2, M个子带上每个子带的 CQI和秩指示符信息 (RI ); 反馈宽 带信道信息, M个子带上每个子带的 PMI, M个子带上的联合 CQI和秩指示 符信息(RI ); 反馈宽带信道信息, M个子带上每个子带的 PMI2, M个子带上 的联合 CQI和秩指示符信息(RI ); 其中, M小于***带宽所包含的子带个数。 通过该优选实施例, 终端釆取上述反馈模式对信道信息进行反馈, 提高了反馈 精度。 优选地, 上述方法中的 M个子带为连续子带 优选地, 宽带 CQI可以包括差分 CQI, 其中差分 CQI为以下之一: 为码 字流之间的差分 CQI; 优选的, 当有两个码字流时, 第二个码字流的宽带 CQI 是基于第一个码字流宽带 CQI的差分 CQI。 优选地, M个子带上每个子带的 CQI可以为差分 CQI, 其中, 差分 CQI 为以下之一: 基于宽带 CQI的差分 CQI; 基于其中一个子带 CQI的差分 CQI; 基于 M个子带的联合 CQI的差分 CQI; 不同码字流之间的差分 CQI; 特别地, 当有两个码字流时,第二个码字流的子带 CQI是基于第一个码字流相应的子带 CQI的差分 CQI。 优选地, M个子带上的联合 CQI可以为差分 CQI, 其中, 差分 CQI为以 下之一: 基于宽带 CQI的差分 CQI; 不同码字流之间的差分 CQI; 当有两个码 字流时, 第二个码字流的 M个子带的联合 CQI是基于第一个码字流的 M个子 带的联合 CQI的差分 CQI。 通过上述三个优选实施例, 釆用差分方式传输 CQI, 降低了开销, 并提高 了精度。 实施例一 本实施例结合了上述实施例及其中的优选的实施方式, 本实施例提供了一 种信道状态信息的反馈方法, 图 2是根据本发明优选实施例的信道状态信息反 馈方法的流程图, 如图 2所示, 该方法包括: 步骤 S202, UE才艮据信道信息确定 CQI、 PMI和 RI,其中, PMI可以包括 PMI1和 PMI2。 步骤 S204, UE才艮据下行控制信令或随机接入相应 ·ί受权 ( Random Access Response Grant )的非周期信道信息上报触发指示, 在 PUSCH上向基站上报信 道状态信息。 优选地,步骤 S204中 UE按照预定反馈方法在物理上行共享信道( PUSCH ) 上向基站反馈信道状态信息。 优选地, UE选择的 M个子带为非连续子带时, 步骤 S204中 UE可以根据 如下的反馈方法进行反馈。 反馈方法包括: 反馈宽带信道信息、 M个子带上每 个子带的 PMI或 PMI2和 M个子带上每个子带的 CQI和秩指示符信息 ( RI ); 或者, 反馈宽带信道信息、 M个子带上每个子带的 PMI或 PMI2和 M个子带 的 CQI和秩指示符信息( RI ); 其中 CQI也可以是差分 CQI; 其中差分 CQI可 以是相对于子带的差分 CQI, 也可以是相对于宽带的差分 CQI; 其中, 宽带信 道信息可以包括整个带宽上的 CQI或和整个带宽上的 PMI或 PMI1。 优选地, UE选择的 M个子带为连续子带时, 步骤 S204中 UE可以才艮据如 下的反馈方法进行反馈。 反馈方法包括: 反馈宽带信道信息、 M 个子带上的 CQI和 M个子带上的 PMI或 PMI2和秩指示符信息 ( RI ); 或者, 反馈宽带信 道信息、 M个子带上每个子带的 PMI或 PMI2和反馈 M个子带上每个子带的 CQI和秩指示符信息 (RI ); 或者, 反馈宽带信道信息、 M个子带上每个子带 的 PMI或 PMI2、 反馈 M个子带上的 CQI和秩指示符信息( RI ); 其中 CQI也 可以是差分 CQI; 其中差分 CQI可以是相对于子带的差分 CQI, 也可以是相对 于宽带的差分 CQI; 其中, 宽带信道信息可以包括整个带宽上的 CQI或和整个 带宽上的 PMI或 PMI1。 本实施例通过增加在 PUSCH上反馈的信道状态信息的反馈模式, 适应了 PMI增强技术的应用, 提高了反馈精度, 降低了反馈开销, 从而显著地提高了 ***性能。 需要说明的是, 根据背景技术中所介绍的, 使用双码本、 双 PMI方式的反 馈结构和使用与双码本等效的单码本、 双 PMI方式的反馈结构, 其本质意义是 相同的, 本申请的各个实施例可以同时用于这两种反馈结构。 结合 R8 中的预 编码反馈技术, 还存在另外一种反馈结构, 即单码本、 单 PMI反馈结构。 实施例二 在八天线传输时, PMI的反馈结构为双码本、 双 PMI反馈或者单码本、 双 PMI反馈, 信道状态信息包括信道质量指示信息 CQI、 预编码矩阵指示符信息 ( PMI )和秩指示符信息(RI )。 其中, 由于八天线增强技术的应用, PMI信息 包括了第一类预编码矩阵指示符信息( PMI1 )和第二类预编码矩阵指示符信息 ( PMI2 )。 具体的, 在 PUSCH信道, 非周期反馈, 从子带集合 S中挑选的 M 个子带为非连续子带时, UE进行信道状态信息反馈包括如下步骤: 步骤 1 : 才艮据信道信息确定信道质量指示信息 CQI、 预编码矩阵指示符信 息 ( PMI1 ) 和 PMI2和秩指示符信息 ( RI )„ 步骤 2: 才艮据下行控制信令或随机接入响应 ·ί受权 ( Random Access Response Grant ) 的非周期信道信息上报触发指示, 在 PUSCH上向基站上报信道状态信 息。 优选地, 步骤 2 中用户终端 UE 才艮据如下反馈方法在物理上行共享信道 ( PUSCH ) 向基站反馈信道状态信息。 该反馈方法包括: ( 1 ) UE确定宽带信道信息, 并上报给基站; 其中, 宽带信道信息可以包 括宽带 PMI1和宽带 CQI; UE确定 M个子带中每个子带的 PMI2信息, 并上 4艮给基站; UE确定每个码字流的 M个子带 CQI信息, 并上 4艮给基站; UE确 定秩指示符信息 (RI ), 并上报给基站; 其中, 当码字流个数大于 1 时, 第二 个码字流的宽带 CQI信息可以为相对于第一个码字流 CQI信息的差分 CQI; 其中, 当码字流个数为 1时, M个子带的 CQI信息可以为绝对 CQI值, 也可 以为相对于宽带 CQI信息的差分 CQI; 其中, 当码字流个数大于 1时, 第二个 码字流的 M个子带的 CQI信息可以为相对于第一个码字流的 M个子带 CQI 信息的差分 CQI; 或者, 所***字流或部分码字流的 M个子带的 CQI信息为 相对于宽带 CQI信息的差分 CQI。 ( 2 ) UE确定宽带信道信息, 并上报给基站; 其中, 宽带信道信息可以包 括宽带 PMI1和宽带 CQI; UE确定 M个子带中每个子带的 PMI2信息, 并上 报给基站; UE确定每个码字流的 M个子带中每个子带的 CQI信息, 并上报给 基站; UE确定 RI, 并上报给基站; 其中, 当码字流个数大于 1时, 第二个码 字流的宽带 CQI信息可以为相对于第一个码字流 CQI信息的差分 CQI; 其中, 当码字流个数为 1时, M个子带中每个子带的 CQI信息可以为绝对 CQI值, 也可以为相对于宽带 CQI信息的差分 CQI; 其中, 当码字流个数大于 1时, 第 二个码字流的 M个子带中每个子带的 CQI信息可以为相对于第一个码字流的 M个子带中每个子带的 CQI信息的差分 CQI; 或者, 所***字流或部分码字流 的 M个子带中每个子带的 CQI信息为相对于宽带 CQI信息的差分 CQI。 实施例三 在四天线传输时, PMI的反馈结构为单码本、 单 PMI结构时, 信道状态信 息包括信道质量指示信息 (CQI )、 预编码矩阵指示符信息 (PMI ) 和秩指示符 信息(RI )。 具体地, 在 PUSCH信道, 非周期反馈, 从子带集合 S中挑选的 M 个子带为非连续子带时, UE进行信道状态信息反馈包括如下步骤: 步骤 1 : 才艮据信道信息确定 CQI、 PMI和 RI; 步骤 2: 才艮据下行控制信令或随节接入响应 4受权 ( Random Access Response Grant ) 的非周期信道信息上报触发指示, 在 PUSCH上向基站上报信道状态信 息。 优选地, 步骤 2 中用户终端 UE 才艮据如下反馈方法在物理上行共享信道
( PUSCH ) 向基站反馈信道状态信息。 该反馈方法包括:
( 1 ) UE确定宽带信道信息, 并反馈给基站; 其中, 宽带信道信息可以包 括宽带 CQI或者可以包括宽带 PMI和宽带 CQI信息; UE确定 M个子带中每 个子带的 PMI信息, 并上 4艮给基站; UE确定每个码字流的 M个子带 CQI信 息, 并上报给基站; UE确定秩指示符信息 (RI ), 并上报给基站; 其中, 当码 字流个数大于 1时,第二个码字流的宽带 CQI信息可以为相对于第一个码字流 CQI信息的差分 CQI; 其中, 当码字流个数为 1时, M个子带的 CQI信息可以 为绝对 CQI值, 也可以为相对于宽带 CQI信息的差分 CQI; 其中, 当码字流 个数大于 1时, 第二个码字流的 M个子带的 CQI信息可以为相对于第一个码 字流的 M个子带 CQI信息的差分 CQI; 或者, 所***字流或部分码字流的 M 个子带的 CQI信息为相对于宽带 CQI信息的差分 CQI;
( 2 ) UE确定宽带信道信息, 并反馈给基站; 其中, 宽带信道信息可以包 括宽带 CQI或者可以包括宽带 PMI和宽带 CQI信息; UE确定 M个子带中每 个子带的 PMI信息, 并上 4艮给基站; UE确定每个码字流的 M个子带中每个子 带的 CQI信息, 并上报给基站; UE确定秩指示符信息 ( RI ), 并上报给基站; 其中, 当码字流个数大于 1时, 第二个码字流的宽带 CQI信息可以为相对于第 一个码字流 CQI信息的差分 CQI; 其中, 当码字流个数为 1时, M个子带中每 个子带的 CQI信息可以为绝对 CQI值, 也可以为相对于宽带 CQI信息的差分 CQI; 其中, 当码字流个数大于 1时, 第二个码字流的 M个子带中每个子带的 CQI信息可以为相对于第一个码字流的 M个子带中每个子带的 CQI信息的差 分 CQI; 或者, 所***字流或部分码字流的 M个子带中每个子带的 CQI信息 为相对于宽带 CQI信息的差分 CQI。 实施例四 在八天线传输时, PMI的反馈结构为双码本、 双 PMI反馈或者单码本、 双
PMI反馈, 信道状态信息包括信道质量指示信息(CQI )、 预编码矩阵指示符信 息 ( PMI ) 和秩指示符信息 (RI )。 其中, 由于八天线增强技术的应用, PMI 信息包括了第一类预编码矩阵指示符信息( PMI1 )和第二类预编码矩阵指示符 信息 (PMI2 )。 具体地, 在 PUSCH信道, 非周期反馈, 从子带集合 S 中挑选 的 M个子带为连续子带时, UE进行信道状态信息反馈包括如下步骤: 步骤 1 : 居信道信息确定信道质量指示信息 (CQI )、 PMI1 和 PMI2和
RI。 步骤 2:才艮据下行控制信令或 Random Access Response Grant的非周期信道 信息上报触发指示, 在 PUSCH上向基站上报信道状态信息。 优选地, 步骤 2中 UE根据如下反馈方法在物理上行共享信道 (PUSCH ) 向基站反馈信道状态信息。 该反馈方法包括:
( 1 ) UE确定宽带信道信息, 并上报给基站; 其中, 宽带信道信息可以包 括宽带 PMI1和宽带 CQI; UE确定 M个子带中每个子带的 PMI2信息, 并上 艮给基站; UE确定每个码字流的 M个子带 CQI信息, 并上 4艮给基站; UE确 定 RI, 并上报给基站; 其中, 当码字流个数大于 1 时, 第二个码字流的宽带 CQI信息可以为相对于第一个码字流 CQI信息的差分 CQI; 其中, 当码字流个 数为 1时, M个子带的 CQI信息可以为绝对 CQI值,也可以为相对于宽带 CQI 信息的差分 CQI; 其中, 当码字流个数大于 1时, 第二个码字流的 M个子带的 CQI信息可以为相对于第一个码字流的 M个子带 CQI信息的差分 CQI; 或者, 所***字流或部分码字流的 M个子带的 CQI信息为相对于宽带 CQI信息的差 分 CQI;
( 2 ) UE确定宽带信道信息, 并上报给基站; 其中, 宽带信道信息可以包 括宽带 PMI1和宽带 CQI; UE确定 M个子带中每个子带的 PMI2信息, 并上 报给基站; UE确定每个码字流的 M个子带中每个子带的 CQI信息, 并上报给 基站; UE确定 RI, 并上报给基站; 其中, 当码字流个数大于 1时, 第二个码 字流的宽带 CQI信息可以为相对于第一个码字流 CQI信息的差分 CQI; 其中, 当码字流个数为 1时, M个子带中每个子带的 CQI信息可以为绝对 CQI值, 也可以为相对于宽带 CQI信息的差分 CQI; 其中, 当码字流个数大于 1时, 第 二个码字流的 M个子带中每个子带的 CQI信息可以为相对于第一个码字流的 M个子带中每个子带的 CQI信息的差分 CQI; 或者, 所***字流或部分码字流 的 M个子带中每个子带的 CQI信息为相对于宽带 CQI信息的差分 CQI;
( 3 ) UE确定宽带信道信息, 并上报给基站; 其中, 宽带信道信息可以包 括宽带 PMI1和宽带 CQI; UE确定 M个子带的 PMI2信息, 并上 4艮给基站;
UE确定每个码字流的 M个子带 CQI信息, 并上报给基站; UE确定 RI, 并上 报给基站; 其中, 当码字流个数大于 1时, 第二个码字流的宽带 CQI信息可以 为相对于第一个码字流 CQI信息的差分 CQI; 其中, 当码字流个数为 1时, M 个子带的 CQI信息可以为绝对 CQI值, 也可以为相对于宽带 CQI信息的差分 CQI; 其中, 当码字流个数大于 1时, 第二个码字流的 M个子带的 CQI信息可 以为相对于第一个码字流的 M个子带 CQI信息的差分 CQI; 或者, 所***字 流或部分码字流的 M个子带的 CQI信息为相对于宽带 CQI信息的差分 CQI。 实施例五 在四天线传输时, PMI的反馈结构为单码本、 单 PMI结构时, 信道状态信 息包括信道质量指示信息 CQI、 PMI和 RI。 具体的, 在 PUSCH信道, 非周期 反馈, 从子带集合 S中挑选的 M个子带为连续子带时, UE进行信道状态信息 反馈包括如下步 4聚: 步骤 1 : 才艮据信道信息确定 CQI、 PMI和 RI; 步骤 2 : 才艮据下行控制信令或随机接入 ·ί受权 ( Random Access Response Grant ) 的非周期信道信息上报触发指示, 在 PUSCH上向基站上报信道状态信 息。 优选地, 步骤 2中 UE根据如下反馈方法在物理上行共享信道 (PUSCH ) 向基站反馈信道状态信息。 该反馈方法包括:
( 1 ) UE确定宽带信道信息, 并反馈给基站; 其中, 宽带信道信息可以包 括宽带 CQI或者可以包括宽带 PMI和宽带 CQI信息; UE确定 M个子带中每 个子带的 PMI信息, 并上 4艮给基站; UE确定每个码字流的 M个子带 CQI信 息, 并上报给基站; UE确定 RI, 并上报给基站; 其中, 当码字流个数大于 1 时, 第二个码字流的宽带 CQI信息可以为相对于第一个码字流 CQI信息的差 分 CQI; 其中, 当码字流个数为 1 时, M个子带的 CQI信息可以为绝对 CQI 值,也可以为相对于宽带 CQI信息的差分 CQI; 其中, 当码字流个数大于 1时, 第二个码字流的 M个子带的 CQI信息可以为相对于第一个码字流的 M个子带 CQI信息的差分 CQI; 或者, 所***字流或部分码字流的 M个子带的 CQI信 息为相对于宽带 CQI信息的差分 CQI;
( 2 ) UE确定宽带信道信息, 并反馈给基站; 其中, 宽带信道信息可以包 括宽带 CQI或者可以包括宽带 PMI和宽带 CQI信息; UE确定 M个子带中每 个子带的 PMI信息, 并上艮给基站; UE确定每个码字流的 M个子带中每个子 带的 CQI信息, 并上报给基站; UE确定 RI, 并上报给基站; 其中, 当码字流 个数大于 1时,第二个码字流的宽带 CQI信息可以为相对于第一个码字流 CQI 信息的差分 CQI; 其中, 当码字流个数为 1 时, M个子带中每个子带的 CQI 信息可以为绝对 CQI值, 也可以为相对于宽带 CQI信息的差分 CQI; 其中, 当码字流个数大于 1时, 第二个码字流的 M个子带中每个子带的 CQI信息可 以为相对于第一个码字流的 M个子带中每个子带的 CQI信息的差分 CQI; 或 者, 所***字流或部分码字流的 M个子带中每个子带的 CQI信息为相对于宽 带 CQI信息的差分 CQI。
( 2 ) UE确定宽带信道信息, 并反馈给基站; 其中, 宽带信道信息可以包 括宽带 CQI或者可以包括宽带 PMI和宽带 CQI信息; UE确定 M个子带的 PMI 信息, 并上报给基站; UE确定每个码字流的 M个子带 CQI信息, 并上报给基 站; UE确定 RI, 并上 4艮给基站; 其中, 当码字流个数大于 1时, 第二个码字 流的宽带 CQI信息可以为相对于第一个码字流 CQI信息的差分 CQI; 其中, 当码字流个数为 1时, M个子带的 CQI信息可以为绝对 CQI值, 也可以为相 对于宽带 CQI信息的差分 CQI; 其中, 当码字流个数大于 1时, 第二个码字流 的 M个子带的 CQI信息可以为相对于第一个码字流的 M个子带 CQI信息的差 分 CQI; 或者, 所***字流或部分码字流的 M个子带的 CQI信息为相对于宽 带 CQI信息的差分 CQI。 本实施例提供了一种终端, 图 3是根据本发明实施例的终端的结构框图, 如图 3所示, 该终端包括: 获取模块 32、 和反馈模块 34 , 下面对上述结构进 行详细 ^笛述: 获取模块 32 , 设置为获取信道状态信息, 其中, 信道状态信息包括: CQI、 PMI和 RI, ,在八天线***中, PMI包括 PMI1和 PMI2,在四天线***中, PMI 包括单 PMI; 反馈模块 34 , 连接至获取模块 32 , 设置为在 PUSCH上按照预定 反馈方法反馈信道状态信息。 图 4是 居本发明实施例的终端的结构框图, 如图 4所示, 反馈模块 34 包括: 第一信息反馈子模块 42和第二信息反馈子模块 44 , 下面对上述结构进 行详细描述: 第一信息反馈子模块 42 , 设置为在 PUSCH上按照以下之一的反馈方法反 馈信道状态信息: 反馈宽带信道信息, M个子带上每个子带的 PMI, M个子带上每个子带的
CQI和 RI; 反馈宽带信道信息, M个子带上每个子带的 PMI2, M个子带上每 个子带的 CQI和 RI; 反馈宽带信道信息, M个子带上每个子带的 PMI, M个 子带的联合 CQI和 RI; 反馈宽带信道信息, M个子带上每个子带的 PMI2, M 个子带的联合 CQI和 RI; 其中, M小于***带宽所包含的子带个数。 第二信息反馈子模块 44, 设置为在 PUSCH上按照以下之一的反馈方法反 馈信道状态信息: 反馈宽带信道信息, M个子带上的联合 PMI, M个子带上的联合 CQI和 RI; 反馈宽带信道信息, M个子带上的联合 PMI2M个子带上的联合 CQI和 RI; 反馈宽带信道信息, M个子带上每个子带的 PMI, M个子带上每个子带的 CQI和 RI; 反馈宽带信道信息, M个子带上每个子带的 PMI2, M个子带上每 个子带的 CQI和 RI; 反馈宽带信道信息, M个子带上每个子带的 PMI , M个 子带上的联合 CQI和 RI; 反馈宽带信道信息, M个子带上每个子带的 PMI2 , M个子带上的联合 CQI和 RI; 其中, M小于***带宽所包含的子带个数。 优选地, 第一信息反馈子模块 42中的反馈方法中的 M个子带为非连续子 带。 优选地, 第二信息反馈子模块 44中反馈方法中 M个子带为连续子带。 本发明实施例还提供了一种终端, 设置为根据指示信息向基站反馈信道状 态信息, 如图 5所示, 该终端包括信息确定模块 52和信息反馈模块 54 , 下面 对上述结构进行详细描述: 信息确定模块 52 , 设置为根据信道信息确定信道质量指示信息 CQI、 PMI 和 RI。 优选地, 信息确定模块 52 居指示信息确定反馈方法, 然后按照反馈方 法将信道状态信息发送至基站。 信息反馈模块 54 , 连接至信息确定模块 52 , 设置为将信息确定模块 52计 算出的信道状态信息根据指示信息, 按照反馈方法, 通过 PUSCH信道发送至 基站。 优选地, 指示信息为基站发送的高层配置信令信息。 优选地,信息确定模块 52设置为根据指示信息确定 RI;信息反馈模块 54 , 将信息确定模块确定 52的 RI发送至基站。 优选地, 信息确定模块 52 , 可以才艮据最新的 RI信息来确定 CQI和 PMI。
CQI可以包括宽带 CQI和 M个子带 CQI或 M个子带中每个子带的 CQI, PMI 可以包括 PMI1和 PMI2。 需要说明的是, 上述实施例中的 PMI1也可以表示为 il , PMI2也可以表示 为 12。 需要说明的是, 上述实施例中描述的终端对应于上述的方法实施例, 其具 体的实现过程在方法实施例中已经进行过详细说明, 在此不再赞述。 综上所述, 通过本发明的上述实施例, 提供了一种信道状态信息反馈方法 及终端。 终端根据信道信息确定信道状态信息, 根据上报方式选择对应的反馈 模式, 并使用该反馈模式反馈信道状态信息, 解决了了相关技术中信道信息反 馈方法开销比较大造成***性能比较差的问题, 从而提高了反馈精度和通信系 统的性能。 显然, 本领域的技术人员应该明白, 上述的本发明的各模块或各步骤可以 用通用的计算装置来实现, 它们可以集中在单个的计算装置上, 或者分布在多 个计算装置所组成的网络上, 可选地, 它们可以用计算装置可执行的程序代码 来实现, 从而, 可以将它们存储在存储装置中由计算装置来执行, 并且在某些 情况下, 可以以不同于此处的顺序执行所示出或描述的步骤, 或者将它们分别 制作成各个集成电路模块, 或者将它们中的多个模块或步骤制作成单个集成电 路模块来实现。 这样, 本发明不限制于任何特定的硬件和软件结合。 以上所述仅为本发明的优选实施例而已, 并不用于限制本发明, 对于本领 域的技术人员来说, 本发明可以有各种更改和变化。 凡在本发明的 ^"神和原则 之内, 所作的任何修改、 等同替换、 改进等, 均应包含在本发明的保护范围之 内。

Claims

权 利 要 求 书
1. 一种信道状态信息反馈方法, 包括:
终端获取信道状态信息, 其中, 所述信道状态信息包括: 信道质量 指示信息 CQI、预编码矩阵指示符信息 PMI和秩指示符信息 RI; 在八天 线***中, 所述 PMI包括第一类预编码指示符 PMI1和第二类预编码指 示符 PMI2; 在四天线***中, 所述 PMI包括单 PMI;
所述终端在上行物理共享信道 PUSCH上按照预定反馈方法反馈所 述信道状态信息。
2. 根据权利要求 1所述的方法, 其中, 所述终端在 PUSCH上按照预定反 馈方法反馈所述信道状态信息包括:
所述终端在所述 PUSCH信道上按照如下之一的反馈方法反馈所述 信道状态信息:
反馈所述宽带信道信息, M个子带上每个子带的 PMI, M个子带上 每个子带的 CQI和所述 RI;
反馈所述宽带信道信息, 所述 M个子带上每个子带的 PMI2, 所述 M个子带上每个子带的 CQI和所述 RI;
反馈所述宽带信道信息, 所述 M个子带上每个子带的 PMI, 所述 M 个子带上的联合 CQI和所述 RI;
反馈所述宽带信道信息, 所述 M个子带上每个子带的 PMI2, 所述 M个子带上的联合 CQI和所述 RI;
其中, M小于***带宽所包含的子带个数。
3. 根据权利要求 2所述的方法, 其中, 所述 M个子带为非连续子带。
4. 根据权利要求 1所述的方法, 其中, 所述终端在 PUSCH上按照预定反 馈方法反馈所述信道状态信息包括:
所述终端在所述 PUSCH信道上按照以下之一的反馈方法反馈所述 信道状态信息: 反馈宽带信道信息, 所述 M个子带上的联合 PMI, M个子带上的联 合 CQI和所述 RI;
反馈所述宽带信道信息, 所述 M个子带上的联合 PMI2, 所述 M个 子带上的联合 CQI和所述 RI;
反馈所述宽带信道信息, M个子带上每个子带的 PMI, M个子带上 每个子带的 CQI和所述 RI;
反馈所述宽带信道信息, M个子带上每个子带的 PMI2, 所述 M个 子带上每个子带的 CQI和所述 RI;
反馈所述宽带信道信息, 所述 M个子带上每个子带的 PMI, 所述 M 个子带上的联合 CQI和所述 RI;
反馈所述宽带信道信息, 所述 M个子带上每个子带的 PMI2, 所述 M个子带上的联合 CQI和所述 RI;
其中, M小于***带宽所包含的子带个数。 根据权利要求 4所述的方法, 其中, 所述 M个子带为连续子带。 根据权利要求 2或 4所述的方法, 其中,
所述宽带信道信息包括以下之一及其组合: 宽带 CQI、 所述宽带带 宽上的单 PMI、 PMI1。 一种终端, 包括:
获取模块, 设置为获取信道状态信息, 其中, 所述信道状态信息包 括: 信道质量指示信息 CQI、 预编码矩阵指示符信息 PMI和秩指示符信 息 RI, 在八天线***中, 所述 PMI包括第一类预编码指示符 PMI1和第 二类预编码指示符 PMI2, 在四天线***中, 所述 PMI包括单 PMI; 反馈模块, 设置为在上行物理共享信道 PUSCH上按照预定反馈方 法反馈所述信道状态信息。 根据权利要求 7所述的终端, 其中, 所述反馈模块包括:
第一信息反馈子模块, 设置为在所述 PUSCH上按照以下之一的反 馈方法反馈所述信道状态信息:
反馈宽带信道信息, M个子带上每个子带的 PMI, M个子带上每个 子带的 CQI和所述 RI; 反馈所述宽带信道信息, 所述 M个子带上每个子带的 PMI2, 所述 M个子带上每个子带的 CQI和所述 RI;
反馈所述宽带信道信息, 所述 M个子带上每个子带的 PMI, 所述 M 个子带的联合 CQI和所述 RI;
反馈所述宽带信道信息, 所述 M个子带上每个子带的 PMI2, 所述 M个子带的联合 CQI和所述 RI;
其中, M小于***带宽所包含的子带个数。
9. 才艮据权利要求 8所述的终端, 其中, 所述 M个子带为非连续子带。
10. 根据权利要求 7所述的终端, 其中, 所述反馈模块包括:
第二信息反馈子模块, 设置为在所述 PUSCH上按照以下之一的反 馈方法反馈所述信道状态信息:
反馈宽带信道信息, 所述 M个子带上的联合 PMI, M个子带上的联 合 CQI和所述 RI;
反馈所述宽带信道信息, 所述 M个子带上的联合 PMI2, M个子带 上的联合 CQI和所述 RI;
反馈所述宽带信道信息, M个子带上每个子带的 PMI, M个子带上 每个子带的 CQI和所述 RI;
反馈所述宽带信道信息, M个子带上每个子带的 PMI2, 所述 M个 子带上每个子带的 CQI和所述 RI;
反馈所述宽带信道信息, 所述 M个子带上每个子带的 PMI, 所述 M 个子带上的联合 CQI和所述 RI;
反馈所述宽带信道信息, 所述 M个子带上每个子带的 PMI2, 所述 M个子带上的联合 CQI和所述 RI;
其中, M小于***带宽所包含的子带个数。
11. 居权利要求 10所述的终端, 其中, 所述 M个子带为连续子带。
12. 根据权利要求 8或 10所述的终端, 其中,
所述宽带信道信息包括以下之一及其组合: 宽带 CQI、 所述宽带带 宽上的 PMI、 PMI1。
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CN101615879A (zh) * 2009-07-01 2009-12-30 苏州大学 步进电机细分驱动方法
CN101826951A (zh) * 2010-05-05 2010-09-08 中兴通讯股份有限公司 反馈信道状态信息的方法及装置
CN101877627A (zh) * 2010-06-21 2010-11-03 中兴通讯股份有限公司 信道状态信息的反馈方法及终端
CN101969363A (zh) * 2010-09-30 2011-02-09 中兴通讯股份有限公司 信道状态信息反馈方法及终端

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US10492124B2 (en) 2017-01-07 2019-11-26 At&T Intellectual Property I, L.P. Configuration of codeword numbers for 5G or other next generation network
US10694450B2 (en) 2017-01-07 2020-06-23 At&T Intellectual Property I, L.P. Configuration of codeword numbers for 5G or other next generation network

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