WO2012068880A1 - 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
WO2012068880A1
WO2012068880A1 PCT/CN2011/076662 CN2011076662W WO2012068880A1 WO 2012068880 A1 WO2012068880 A1 WO 2012068880A1 CN 2011076662 W CN2011076662 W CN 2011076662W WO 2012068880 A1 WO2012068880 A1 WO 2012068880A1
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Prior art keywords
information
matrix indicator
precoding matrix
cqi
feedback
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PCT/CN2011/076662
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English (en)
French (fr)
Inventor
徐前子
李儒岳
陈艺戬
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 WO2012068880A1 publication Critical patent/WO2012068880A1/zh

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Classifications

    • 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
    • H04L1/0001Systems 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
    • H04L1/0031Multiple signaling transmission
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00Arrangements for detecting or preventing errors in the information received
    • H04L1/004Arrangements for detecting or preventing errors in the information received by using forward error control
    • H04L1/0072Error control for data other than payload data, e.g. control data
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00Arrangements for detecting or preventing errors in the information received
    • H04L1/0078Avoidance of errors by organising the transmitted data in a format specifically designed to deal with errors, e.g. location
    • H04L1/0079Formats for control data
    • 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
    • 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
    • H04L2001/125Arrangements for preventing errors in the return channel
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00Baseband systems
    • H04L25/02Details ; arrangements for supplying electrical power along data transmission lines
    • H04L25/03Shaping networks in transmitter or receiver, e.g. adaptive shaping networks
    • H04L25/03006Arrangements for removing intersymbol interference
    • H04L2025/03777Arrangements for removing intersymbol interference characterised by the signalling
    • H04L2025/03802Signalling on the reverse channel
    • H04L2025/03808Transmission of equaliser coefficients

Definitions

  • the present invention relates to an LTE-A (Long Term Evolution Advanced) system technology, and more particularly to a channel state information feedback method and apparatus. Background technique
  • LTE-A Long Term Evolution Advanced
  • spatial multiplexing may be used to increase the transmission rate, that is, different data positions are transmitted at different antenna positions on the same time-frequency resource at the transmitting end. .
  • a plurality of antennas are also used at the receiving end (such as the user terminal UE), and the user equipments occupy the physical resources allocated to the user equipment in a single transmission interval.
  • This transmission form is called single-user MIMO (SU-MIMO); Another case is to allocate resources of different antenna spaces to different users in the case of multiple users, that is, one user equipment and at least one other user equipment share physical resources allocated to the user equipments in one transmission interval, one user equipment. And other user equipments share the same physical resource by space division multiple access or space division multiplexing.
  • the physical resource may be a time-frequency resource.
  • This transmission form is called multi-user MIMO (MU-MIMO).
  • the UE In the Long Term Evolution (LTE) of the 3rd Generation Partnership Project Standards Organization (3GPP), the UE is semi-statically set to be based on one of the following transmission modes by higher layer signaling (transmission) Mode ) to transfer:
  • LTE Long Term Evolution
  • 3GPP 3rd Generation Partnership Project Standards Organization
  • Mode 1 Single antenna port: Port 0 ( Single-antenna port: port 0 );
  • Mode 2 Transmit diversity (Transmit diversity);
  • Mode 3 Open-loop spatial multiplexing
  • Mode 4 Closed-loop spatial multiplexing
  • Mode 5 Multi-user Multiple Input Multiple Output (Multi-user MIMO);
  • Mode 7 Single-antenna port: port 5 .
  • the user terminal (UE) feeds back different channel state information to the transmitting end according to different transmission modes, and then the transmitting end (eNB) performs scheduling according to the channel state information fed back by the UE, and is configured according to certain principles (such as the maximum capacity principle).
  • the new channel state information is used for the actual transmission.
  • the channel state information that is fed back includes: channel quality indication (CQI, Channel quality indication) information, precoding matrix indicator (PMI) information, and rank indicator (RI, Rank Indicator) information. among them,
  • CQI an indicator to measure the quality of downlink channels. Used in CQI in the 36-213 agreement
  • the integer values from 0 to 15 represent different CQI levels, and different CQIs correspond to their respective modulation modes and coding rate (MCS).
  • RI used to describe the number of spatially independent channels, corresponding to the rank of the channel response matrix.
  • open-loop spatial 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.
  • the feedback channel state information includes: CQI information, PMI information, and RI information.
  • the feedback of the CQI/PMI and RI can be periodic feedback or non-periodic feedback.
  • the specific feedback is shown in Table 1:
  • CQI/PMI, RI if the UE does not need to send For the data, the CQI/PMI and RI of the periodic feedback are transmitted on the physical uplink control channel (PUCCH, Physical Uplink Control Channel) in the format 2/2a/2b (PUCCH format 2/2a/2b). If the UE needs to send data, then CQI/PMI, RI is transmitted in the Physical Uplink Shared Channel (PUSCH); for CQI/PMI and RI of aperiodic feedback, it is transmitted only on the PUSCH.
  • PUCCH Physical Uplink Control Channel
  • the UE When performing PMI reporting, the UE reports one or more PMIs.
  • the UE is restricted to PMI and RI in the pre-coded codebook specified by the high-level configuration of the codebook Subset Restriction.
  • the UE periodically feeds back CQI/PMI/RI information on the PUCCH physical channel, and the feedback mode used is shown in Table 2.
  • Report type 2 supports broadband CQI and PMI feedback
  • Subband CQI Higher Layer configured (Subband CQI) feedback and Multiple PMI feedback are not supported on the PUCCH channel.
  • the bit overhead of the direct feedback channel response matrix is too large, or the channel response matrix is decomposed such as SVD, so that the optimal precoding matrix is obtained for feedback, and the overhead is still large. Therefore, it is necessary to construct some precoding codebook sets known to the transceiver end, compare the obtained optimal precoding matrix with the coding matrix in the precoding codebook set, and select the index value corresponding to the most approximate precoding codebook. For feedback, this can greatly save bit overhead.
  • the index value of these feedback precoding codebooks is the PMI.
  • the feedback type of the 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; aperiodic feedback, feedback carried on the uplink shared channel PUSCH .
  • the periodic feedback must be configured.
  • the aperiodic feedback is an occasional trigger type feedback.
  • the aperiodic feedback on the PUSCH is a kind of higher precision feedback, which is auxiliary and is used to improve the accuracy of the feedback.
  • the LTE-A Long Term Evolution Advanced
  • LTE-A Long Term Evolution Advanced
  • LTE-A supports larger system bandwidths (up to 100 MHz) and is backward compatible with existing LTE standards.
  • LTE-A supports up to 8 antennas on the basis of the existing LTE system, and provides some feedback on codebook feedback.
  • the enhanced technology 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 (IMT-Advance, International Mobile Telecommunications-Advance) system and alleviate the shortage of spectrum resources.
  • IMT-Advance International Mobile Telecommunications-Advance
  • the channel state information feedback generally includes: First, the base station sends a pilot to the UE, where the pilot is used by the UE to estimate the downlink channel; then, the UE estimates the downlink channel according to the pilot signal, and determines channel state information, including RI, PMI, and CQI; Finally, the UE feeds back channel state information to the base station according to the feedback mode.
  • the channel information that may need to be transmitted has RI, PMI and CQI, and the PMI information may include the first a precoding indicator information ( il ) and first precoding indicator information ( i2 ) Two precoding indicators.
  • the channel information that may need to be transmitted has RI, PMI, and CQI, where PMI information may include Il and i2.
  • PMI information may include Il and i2.
  • two precoding indicators of il and i2 are required to be fed, which causes a channel state information feedback method for transmitting only one PMI value in the PUCCH channel in the LTE system, specifically, calculating CQI information and PMI information. The method cannot be applied to the new technical requirements in LTE-A.
  • an implementation scheme of how to calculate CQI information and PMI information in channel state information in the LTE-A system is not provided. Summary of the invention
  • the main object of the present invention is to provide a channel state information feedback method and apparatus, which can ensure normal feedback of channel state information in the LTE-A system, thereby ensuring normal operation of the communication system.
  • a channel state information feedback method includes the following steps:
  • the user terminal UE determines channel state information; wherein the channel state information includes one or any combination of the following information: rank indicator RI information, channel quality indicator CQI information, precoding matrix indicator PMI information;
  • the determined channel state information is fed back to the base station periodically through the physical uplink control channel PUCCH.
  • the CQI information and the PMI information are respectively calculated by the RI information;
  • the PMI information includes: a first precoding matrix indicator il information and/or a second precoding matrix indicator i2 information.
  • the channel state information determined by the PUCCH to the base station period feedback includes:
  • the RI information and the first precoding matrix indicator information il are jointly encoded and exist in the same report type; the CQI information and the second precoding.
  • Matrix indicator information i2 present in another report type;
  • the RI information is independently coded and exists in one type of advertisement; the CQI information, the first precoding matrix indicator information il and the second precoding matrix indicator information i2 are present in another report type;
  • the CQI information exists independently in one report type.
  • the channel state information determined by the feedback specifically includes:
  • the UE jointly calculates the CQI information and the i2 information according to the last fed back RI value and the last feedback il information, and feeds the obtained CQI information and the i2 information to the base station; or the UE only reports the last fed back RI.
  • the value, the CQI information, the il information, and the i2 information are calculated, and the obtained CQI information, il information, and i2 information are fed back to the base station; or
  • the UE jointly calculates the CQI information and the i2 information according to the lowest RI value and the fixed il value in the code mapping parameter codebook subset rule, and feeds the obtained CQI information and the i2 information to the base station; or
  • the UE jointly calculates the CQI information and the i2 information according to the lowest RI value in the bit map parameter codebook subset rule and the last feedback il information, and feeds the obtained CQI information and the i2 information to the base station; or
  • the UE calculates CQI information, il information, and i2 information according to the lowest RI value in the bit mapping parameter codebook subset rule, and feeds the obtained CQI information, il information, and i2 information to the base station or
  • the UE jointly calculates the CQI information and the i2 information according to the last fed back RI value and the fixed il value, and feeds the obtained CQI information and the i2 information to the base station; or
  • the UE calculates the CQI information according to the RI value of 1, and feeds the obtained CQI information to the base station.
  • the bit mapping parameter codebook subset rule is obtained by a high layer configuration
  • a channel state information feedback device includes at least: a processing module and a feedback module, where the processing module is configured to determine channel state information, where the channel state information includes one or any combination of the following information: RI information, CQI information, PMI information;
  • the feedback module is configured to periodically feed back the determined channel state information to the base station through the PUCCH.
  • the processing module is further configured to receive a pilot from a base station, and estimate a downlink channel according to the pilot signal.
  • the PMI information includes a first precoding matrix indicator il information and a second precoding matrix indicator i2 information.
  • the processing module is specifically configured to:
  • the RI information is independently encoded, and the il information and the CQI information and the i2 information are calculated according to the RI encoded information; or
  • the processing module is specifically configured to:
  • the CQI information and the i2 information are jointly calculated, and the obtained CQI information and the i2 information are output to the feedback module;
  • the CQI information, the il information, and the i2 information are calculated, and the obtained CQI information, il information, and i2 information are output to the feedback module; or
  • bit mapping parameter The digital subset rule is obtained by the high-level configuration; or,
  • the CQI information and the i2 information are jointly calculated, and the obtained CQI information and i2 information are output to the feedback module; or
  • the CQI information is calculated according to the RI value of 1, and the obtained CQI information is output to the feedback module.
  • the UE includes determining channel state information, and returns the determined channel state information to the base station by using the PUCCH.
  • the channel state information includes one or any combination of the following information: RI information, CQI information, and PMI information.
  • the PMI information may include il and i2.
  • the present invention provides a technical solution for feeding back channel state information in an LTE-A system and ensures the normality of channel state information feedback. Further, even when the RI information or the RI and il joint coding information is lost, the normal feedback of the channel state information is ensured by the method of the present invention, thereby ensuring the normal operation of the communication system.
  • FIG. 1 is a schematic diagram of feedback of CSI feedback mode 1 in downlink downlink feedback in LTE-A
  • FIG. 2 is a feedback diagram of CSI feedback mode 2 in downlink downlink feedback in LTE-A
  • FIG. 3 is a flow of channel state information feedback method according to the present invention
  • FIG. 4 is a schematic structural diagram of a channel state information feedback apparatus according to the present invention. detailed description
  • 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 that the feedback of the PMI 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, which mainly includes two implementation modes: Dual PMI feedback, or define a single codebook equivalent to dual codebook and dual PMI feedback.
  • Defining the dual codebook and dual PMI feedback includes: The structure of the precoding/feedback 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.
  • a matrix represents the properties of a wideband or long-term channel.
  • Another matrix representation The properties of a band or a short-term channel.
  • the matrix codebook used is represented in the form of a finite number of matrix sets, and each matrix is known to the UE and the base station.
  • 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: for one subband or multiple joint subbands that need to feed back the channel information, the UE feeds back two PMI information to the base station (in some cases, it is not necessarily simultaneous feedback, and one can be predefined)
  • the PMI is a fixed value, and no feedback is performed, and is respectively a first precoding matrix indicator information (U) and a second precoding matrix indicator information (i2), where il corresponds to a codeword W1, i2 in one codebook C1. Corresponds to the code word W2 in another codebook C2.
  • W2) Obtains channel information W.
  • the above dual codebook design criteria is a specific codebook form in LTE-A.
  • the codebook corresponding to W1 and W2 needs to be defined.
  • W1 and W2 needs to be defined.
  • W2 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 W1).
  • W2 not directly feedback W
  • This part of the consideration for the single codebook and the double codebook form are similar.
  • the second important part is how to split W into two codebooks to better adapt to the channel time/frequency domain variation, which effectively saves overhead. This is a double-coded cost saving consideration, and there is no such consideration in a single codebook.
  • Table 3 in Table 3 is a code word commonly indicated by ' ⁇ '2, which can usually be written as a function form j2mn/ 2 j4mn/ 2 j6mn/ 2
  • the definition of the dual codebook equivalent single codebook and dual PMI feedback is equivalent to the dual codebook dual PMI.
  • the only difference is that no two codebooks C1 and C2 are defined in this method. Instead, Define the codebook corresponding to W composed of the double codebook and its function relationship, that is, the virtual codebook is replaced by CI, C2 by actual definition.
  • the channel information that may need to be transmitted is RI, PMI, and CQI, where the PMI information may include the first precoding.
  • Indicator information (il) and first precoding indicator information (i2) Two precoding indicators.
  • the PMI and CQI information of the periodic feedback can be calculated by the last fed back RI information. When the RI information is completely lost, the lowest RI value given by the bit map parameter subset book codebookSubsetRestriction is retrieved.
  • bit map parameter book subset rule (codebookSubsetRestriction ) is obtained by the high layer configuration.
  • the CSI feedback mode 1 and the CSI feedback mode 2 are included.
  • the RI information and the il information are jointly encoded, and are transmitted in a relatively long period in the same subframe.
  • the CQI information and the i2 information are transmitted in a relatively short period in another sub-frame.
  • the RI information is independently coded and transmitted in a relatively long period in one subframe; the CQI information and il and i2 are transmitted in a relatively short period in another subframe.
  • Figure 2 the RI information is independently coded and transmitted in a relatively long period in one subframe; the CQI information and il and i2 are transmitted in a relatively short period in another subframe.
  • FIG. 3 is a flowchart of a channel state information feedback method according to the present invention. As shown in FIG. 3, the method includes: Step 300: The UE determines channel state information.
  • the channel state information includes one or any combination of the following information: RI information, CQI information, and PMI information.
  • the CQI information and the PMI information are respectively calculated by using the RI information.
  • the PMI information includes: il information and/or i2 information.
  • the CQI information or the i2 information is respectively calculated by the joint information of the RI and the il;
  • the il information is obtained by calculation of the RI information
  • the i2 information is obtained by calculation of the RI information
  • the CQI information is calculated by the RI information
  • the CQI information is obtained by calculating RI to 1;
  • the RI information and the il information can be jointly coded, or the RI information can be independently coded.
  • Step 301 The determined channel state information is fed back to the base station through the PUCCH.
  • the CSI feedback mode 1 and the CSI feedback mode 2 may be included when the channel state information is fed back.
  • the channel state information includes the RI letter.
  • the RI information and the il information are jointly encoded, and are transmitted in a relatively long period in the same subframe; and the CQI information and the i2 information are transmitted in a relatively short period in another subframe. That is, the RI information and the il information joint coding exist in the same report type, and the i2 information and the CQI information exist in the same report type, as shown in FIG. 1, FIG. 1 is the LTE-A downlink period. Feedback diagram of CSI feedback mode 1 during feedback;
  • the RI information is independently coded and transmitted in a relatively long period in one subframe; the CQI information, il and i2 are transmitted in another subframe in a relatively short period, that is,
  • the RI information exists in a 4 advertisement type, and the il information, the i2 information, and the CQI information exist in the same 4 advertisement type, as shown in FIG. 2, and
  • FIG. 2 is CSI feedback in the LTE-A downlink and downlink feedback. Schematic diagram of mode 2 feedback.
  • the channel state information determined by the feedback specifically includes:
  • the UE jointly calculates the CQI information and the i2 information according to the last fed back RI value and the last feedback il information, and feeds the obtained CQI information and the i2 information to the base station; or
  • the UE calculates the CQI information, the il information, and the i2 information according to the last fed back RI value, and feeds back the obtained CQI information, il information, and i2 information to the base station; or
  • the UE calculates the CQI information and the i2 information according to the lowest RI value and the fixed il value in the code mapping parameter codebook rule, and feeds the obtained CQI information and the i2 information to the base station; or
  • the UE jointly calculates the CQI information and the i 2 information according to the lowest RI value and the last feedback il information in the bit mapping parameter codebook subset rule, and feeds the obtained CQI information and the i2 information to the base station; or
  • the UE calculates the CQI information, the il information, and the i2 information according to the lowest RI value in the bit map parameter codebook subset rule, and feeds back the obtained CQI information, il information, and i2 information to the base station; or
  • the UE jointly calculates the CQI information and the i2 information according to the last fed back RI value and the fixed il value, and feeds back the obtained CQI information and the i2 information to the base station; or The UE calculates the CQI information according to the RI value of 1, and feeds the obtained CQI information to the base station.
  • the normal feedback CQI and/or i2 information is ensured, thereby ensuring the entire communication.
  • the method of the present invention further includes: the base station transmitting a pilot to the UE, where the pilot is used by the UE to estimate the downlink channel, and the UE estimates the downlink channel according to the pilot signal.
  • the base station transmitting a pilot to the UE, where the pilot is used by the UE to estimate the downlink channel, and the UE estimates the downlink channel according to the pilot signal.
  • the medium channel state information feedback device is further provided. As shown in FIG. 4, at least the processing module and the feedback module are included, where
  • a processing module configured to determine channel state information, where the channel state information includes one or any combination of the following information: RI information, CQI information, and PMI information.
  • PMI information includes il information and/or i2 information; jointly encodes RI information and il information, and obtains CQI information or i2 information according to RI information and il joint information; or independently encodes RI information according to RI
  • the information calculation obtains the CQI information, the il information, and the i2 information; or, the CQI information is obtained according to the RI value of 1.
  • the processing module is specifically configured to:
  • the CQI information and the i2 information are jointly calculated, and the obtained CQI information and the i2 information are output to the feedback module;
  • the CQI information, the il information, and the i2 information are calculated, and the obtained CQI information, il information, and i2 information are output to the feedback module; or
  • bit mapping parameter Digital subset rules are obtained by high-level configuration
  • the CQI information and the i2 information are jointly calculated, and the obtained CQI information and the i2 information are output to the feedback module;
  • the CQI information is calculated according to the RI value of 1, and the obtained CQI information is output to the feedback module.
  • the channel state information device of the present invention can be disposed in the UE.
  • channel state information is periodically fed back on the PUCCH.
  • the UE feeds back the channel.
  • the status information includes RI information, il information, i2 information, and CQI information.
  • the RI information and the il information are jointly encoded and transmitted in a relatively long period in the same subframe; the CQI information and the i2 information are transmitted in a relatively short period in another subframe.
  • the CQI information and the i2 information in the channel state information are calculated from the RI and il joint information of the last feedback.
  • the UE calculates the CQI information and the i2 information according to the lowest RI value and the fixed il value in the code mapping parameter codebook rule, and feeds the obtained CQI information and the i2 information to the base station; or
  • the UE calculates the CQI letter according to the lowest RI value in the bit map parameter codebook subset rule.
  • the UE calculates the CQI information according to the RI value of 1, and feeds the obtained CQI information to the base station.
  • Embodiment 2 It is assumed that in the LTE-A system, channel state information is periodically fed back on the PUCCH. As shown in FIG. 2, when the feedback mode 1-1 is used, and the CSI feedback mode 2 is switched to the CSI feedback mode 1,
  • the UE feedback channel state information includes RI information, il information, i2 information, and CQI information.
  • the CSI feedback mode 1 refers to the joint coding of the RI information and the il information, and transmits in a relatively long period in the same subframe; the CQI information and the i2 information are in a relatively short period in another subframe. Transfer.
  • the CSI feedback mode 2 means that the RI information is independently coded and transmitted in a relatively long period in one subframe; the CQI information and il and i2 are transmitted in a relatively short period in another subframe.
  • the CQI information, the il information, and the i2 information in the channel state information are respectively calculated according to the last fed back RI information; in the CSI feedback mode 1, the CQI information in the channel state information, The i2 information is calculated based on the combined RI and il information of the last feedback. Specifically, when the converted R1/il joint information is lost, in particular, when all the fed back RI and il joint information are lost, the UE calculates and feeds back the channel according to one of the following methods. status information:
  • the UE jointly calculates the CQI information and the i2 information according to the last fed back RI value and the last feedback il information, and feeds the obtained CQI information and the i2 information to the base station; or
  • the UE calculates the CQI information, the il information, and the i2 information according to the last fed back RI value, and feeds back the obtained CQI information, il information, and i2 information to the base station; or
  • the UE jointly calculates the CQI information and the i2 information according to the lowest RI value and the fixed il value in the code mapping parameter codebook subset rule, and feeds the obtained CQI information and the i2 information to the base station; or
  • the UE jointly calculates the CQI information and the i 2 information according to the lowest RI value and the last feedback il information in the bit mapping parameter codebook subset rule, and feeds the obtained CQI information and the i2 information to the base station; or
  • the UE calculates the CQI information, the il information, and the i2 information according to the lowest RI value in the bit map parameter codebook subset rule, and feeds back the obtained CQI information, il information, and i2 information to the base station; or
  • the UE jointly calculates the CQI information and the i2 information according to the last fed back RI value and the fixed il value, and feeds back the obtained CQI information and the i2 information to the base station; or
  • the UE calculates the CQI information according to the RI value of 1, and feeds the obtained CQI information to the base station.

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Description

一种信道状态信息反馈方法及装置 技术领域
本发明涉及高级长期演进( LTE-A , Long Term Evolution Advanced ) 系 统技术, 尤指一种信道状态信息反馈方法及装置。 背景技术
在无线通信中, 如果在发送端 (如节点 eNB )使用多根天线, 可以釆 取空间复用的方式来提高传输速率, 即在发送端相同的时频资源上的不同 天线位置发射不同的数据。 在接收端 (如用户终端 UE )也使用多根天线, 个用户设备在一个传输间隔内独自占有分配给所述用户设备的物理资源, 这种传输形式称为单用户 MIMO ( SU-MIMO ); 另一种情况是在多用户的 情况下将不同天线空间的资源分配给不同用户, 即一个用户设备和至少一 个其它用户设备在一个传输间隔内共享分配给这些用户设备的物理资源, 一个用户设备和其它用户设备通过空分多址或者空分复用方式共享同一物 理资源, 该物理资源可以是时频资源, 这种传输形式称为多用户 MIMO ( MU-MIMO )。
在第三代合作伙伴计划标准组织( 3GPP )的长期演进技术( LTE, Long term Evolution ) 中, UE通过高层信令半静态 ( semi-statically )地被设置为 基于以下的一种传输模式( transmission mode )进行传输:
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: 闭环秩( Rank ) =1预编码( Closed-loop Rank=l precoding ); 模式 7: 单天线端口: 端口 5 ( Single-antenna port: port 5 )。
用户终端 (UE )根据不同的传输模式向发送端反馈不同的信道状态信 息, 然后发送端(eNB )再根据 UE所反馈的信道状态信息进行调度, 并根 据一定的原则 (如最大容量原则) 配置新的信道状态信息用于实际传输。 其中, 反馈的信道状态信息包括: 信道质量指示 (CQI , Channel quality indication )信息、 预编码矩阵指示符(PMI, Precoding Matrix Indicator )信 息和秩指示符( RI , Rank Indicator )信息。 其中,
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。
反馈的信道状态信息包括: CQI信息、 PMI信息和 RI信息。
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 1所示:
Figure imgf000004_0001
表 1
表 1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(PUCCH, Physical Uplink Control Channel )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( PUSCH, Physical Uplink Shared Channel ) 中传输; 对于非周期性反馈的 CQI/PMI、 RI而言, 只在 PUSCH上传输。
当进行 PMI上报时, UE报告一个或多个 PMI。 UE被限制在由高层配 置的比特映射参量码本子集规则 (codebook Subset Restriction )指定的预编 码码本中进行 PMI和 RI上" ^艮。
根据高层的半静态配置, UE 在 PUCCH 物理信道上周期性的反馈 CQI/PMI/RI信息, 釆用的反馈模式如表 2所示。
Figure imgf000005_0001
表 2
每个 PUCCH 4艮告模式中具有四个不同周期和偏移量的 CQI/PMI以及 RI报告类型:
• 报告类型 1支持终端选择子带的 CQI反馈
· 报告类型 2支持宽带 CQI和 PMI反馈
• 报告类型 3支持 RI反馈
• 告类型 4 支持宽带 CQI
PUCCH信道上不支持高层配置 (Higher Layer configured (Subband CQI) )反馈和 Multiple PMI反馈。 在多天线***中, 直接反馈信道响应矩阵的比特开销太大, 或者对信 道响应矩阵进行诸如 SVD的分解, 从而得出最佳的预编码矩阵进行反馈, 其开销依然很大。 因此, 需要构造一些收发端均已知的预编码码本集合, 将得到的最佳预编码矩阵和预编码码本集合中的编码矩阵进行对比, 选择 最近似的预编码码本对应的索引值来进行反馈, 这样可以极大的节省比特 开销。 这些反馈的预编码码本的索引值就是 PMI。
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。 其中, 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。
高级长期演进(LTE-A, Long Term Evolution Advanced )***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根天线, 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 ( IMT-Advance , International Mobile Telecommunications-Advance ) ***的频谱利用率、 緩解频谱资源紧缺。
在 LTE-A***中, 信道状态信息反馈大致包括: 首先, 基站向 UE发 送导频, 该导频用于 UE估计下行信道; 接着, UE根据导频信号估计下行 信道, 确定信道状态信息, 包括 RI、 PMI和 CQI; 最后, UE按照反馈模式 向基站反馈信道状态信息。
综上, 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信息可能包括了第一预编码指示符信息( il )和第一预编码指示符信息 ( i2 ) 两个预编码指示符。
综上所述, 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 il和 i2。 由于在 LTE-A中, 需要反馈 il和 i2两个 预编码指示符, 这使得 LTE***中的、 在 PUCCH信道中只传输一个 PMI 值的信道状态信息反馈方法, 具体涉及计算 CQI信息和 PMI信息的方法, 不能适用于 LTE-A中新的技术要求。 而现有技术中, 没有提供 LTE-A*** 中如何反馈信道状态信息中计算 CQI信息和 PMI信息的方法的实现方案。 发明内容
有鉴于此, 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 装置, 能够保证在 LTE-A***中正常地反馈信道状态信息, 进而保证通信 ***的正常工作。
为达到上述目的, 本发明的技术方案是这样实现的:
一种信道状态信息反馈方法, 包括以下步骤:
用户终端 UE确定信道状态信息; 其中,信道状态信息包括以下信息之 一或任意组合: 秩指示符 RI信息、 信道质量指示 CQI信息、 预编码矩阵指 示符 PMI信息;
通过物理上行控制信道 PUCCH向基站周期反馈确定的信道状态信息。 所述 CQI信息和 PMI信息分别由 RI信息计算获得;
所述 PMI信息包括:第一预编码矩阵指示符 il信息和 /或第二预编码矩 阵指示符 i2信息。
所述通过 PUCCH向基站周期反馈确定的信道状态信息包括:
所述信道状态信息包括 RI信息、 CQI信息、 PMI信息时, 所述 RI信 息和第一预编码矩阵指示符信息 il联合编码, 存在于同一个报告类型中; 所述 CQI信息和第二预编码矩阵指示符信息 i2,存在于另一个报告类型中; 或者,所述 RI信息独立编码,存在于一个 告类型中; 所述 CQI信息、 第一预编码矩阵指示符信息 il和第二预编码矩阵指示符信息 i2, 存在于另 一个报告类型中;
或者, 所述 CQI信息独立存在于一个报告类型中。
所述反馈确定的信道状态信息具体包括:
所述 UE根据最后反馈的 RI值和最后反馈的 il信息, 共同计算得到 CQI信息和 i2信息, 并将得到的 CQI信息和 i2信息反馈给基站; 或者, 所述 UE才艮据最后反馈的 RI值,计算得到 CQI信息、 il信息和 i2信息, 并将得到的 CQI信息、 il信息和 i2信息反馈给基站; 或者,
所述 UE根据比特映射参数码本子集规则中的最低 RI值和固定 il值, 共同计算得到 CQI信息和 i2信息, 并将得到的 CQI信息和 i2信息反馈给 基站; 或者,
所述 UE根据比特映射参数码本子集规则中的最低 RI值和最后反馈的 il信息, 共同计算得到 CQI信息和 i2信息, 并将得到的 CQI信息和 i2信 息反馈给基站; 或者,
所述 UE根据比特映射参数码本子集规则中的最低 RI值,计算得到 CQI 信息、 il信息和 i2信息, 并将得到的 CQI信息、 il信息和 i2信息反馈给基 站 或者,
所述 UE根据最后反馈的 RI值和固定 il值,共同计算得到 CQI信息和 i2信息, 并将得到的 CQI信息和 i2信息反馈给基站; 或者,
所述 UE才艮据 RI取值为 1来计算得到 CQI信息,并将得到的 CQI信息 反馈给基站。
其中, 所述比特映射参数码本子集规则由高层配置得到;
一种信道状态信息反馈装置, 至少包括: 处理模块和反馈模块, 其中, 处理模块, 用于确定信道状态信息, 其中, 信道状态信息包括以下信 息之一或任意组合: RI信息、 CQI信息、 PMI信息; 反馈模块, 用于通过 PUCCH向基站周期反馈确定的信道状态信息。 所述处理模块, 还用于接收来自基站的导频, 并根据导频信号估计下 行信道。
所述 PMI信息包括第一预编码矩阵指示符 il信息和第二预编码矩阵指 示符 i2信息; 所述处理模块, 具体用于:
对所述 RI信息和 il信息进行联合编码, 根据 RI和 il联合信息计算获 得 CQI信息或 i2信息; 或者,
对所述 RI信息独立编码, 4艮据 RI编码信息计算获得 il信息和 CQI信 息、 i2信息; 或者,
根据 RI取值为 1 来计算获得 CQI信息。
所述处理模块具体用于:
根据最后反馈的 RI值和最后反馈的 il信息, 共同计算得到 CQI信息 和 i2信息, 并将得到的 CQI信息和 i2信息输出给反馈模块; 或者,
才艮据最后反馈的 RI值, 计算得到 CQI信息、 il信息和 i2信息, 并将 得到的 CQI信息、 il信息和 i2信息输出给反馈模块; 或者,
根据比特映射参数码本子集规则中的最低 RI值和固定 il值,共同计算 得到 CQI信息和 i2信息, 并将得到的 CQI信息和 i2信息输出给反馈本模 块; 或者,
根据比特映射参数码本子集规则中的最低 RI值和最后反馈的 il信息, 共同计算得到 CQI信息和 i2信息, 并将得到的 CQI信息和 i2信息输出给 反馈模块; 或者,
根据比特映射参数码本子集规则中的最低 RI值, 计算得到 CQI信息、 il信息和 i2信息,并将得到的 CQI信息、 il信息和 i2信息输出给反馈模块; 其中, 所述比特映射参数码本子集规则由高层配置得到; 或者,
才艮据最后反馈的 RI值和固定 il值,共同计算得到 CQI信息和 i2信息, 并将得到的 CQI信息和 i2信息输出给反馈模块; 或者, 根据 RI取值为 1来计算得到 CQI信息, 并将得到的 CQI信息输出给 反馈模块。
从上述本发明提供的技术方案可以看出, 包括 UE确定信道状态信息; 通过 PUCCH向基站周期返回确定的信道状态信息。其中,信道状态信息包 括以下信息之一或任意组合: RI信息、 CQI信息、 PMI信息。 其中 PMI信 息可能包括 il和 i2。本发明提供了 LTE-A***中反馈信道状态信息的技术 方案并保证了信道状态信息反馈的正常性。 进一步地, 即使在丟失 RI信息 或 RI和 il联合编码信息时,通过本发明方法,也保证了信道状态信息的正 常反馈, 从而保证了通信***的正常工作。 附图说明
图 1为 LTE-A中下行周期反馈时 CSI反馈模式 1的反馈示意图; 图 2为 LTE-A中下行周期反馈时 CSI反馈模式 2的反馈示意图; 图 3为本发明信道状态信息反馈方法的流程图;
图 4为本发明信道状态信息反馈装置的组成结构示意图。 具体实施方式
在 LTE-A***中, 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反馈包括: 一个子带的预编码 /反馈的结构由两个 矩阵组成。 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。 一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。 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。 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), 分别为第一预编码 矩阵指示符信息 (U )和第二预编码矩阵指示符信息 (i2 ), 其中 il对应一 个码本 C1中的码字 Wl , i2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 il和 i2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。 在具体实 现时, 只需要定义 W1和 W2对应的码本, 但是, 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 3所示: i 2
0 1 N2
0 -> -> -> ->
1
-> -> -> ->
h
2 -> -> -> ->
3
-> -> -> ->
-> -> -> ->
N-l
-> -> -> ->
Nl -> -> -> ->
表 3 表 3 中的 为一个由 'Ί '2共同指示的码字, 通常可以写成函数形式 j2mn/ 2 j4mn/ 2 j6mn/ 2
I需要确定 'Ί '2即可。例如, r = 1时, ν™ 1 e e e- 等价于下表 4。
Figure imgf000012_0001
表 4
实际上, 定义双码本等效的单码本和双 PMI反馈的方式与双码本双 PMI等价, 唯一不同的在于这种方法中不再定义两个码本 C1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 CI, 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 息可能包括了第一预编码指示符信息 (il )和第一预编码指示符信息 (i2) 两个预编码指示符。 周期反馈的 PMI和 CQI信息可以由最后反馈的 RI信息来计算的, 当 RI 信息 完全丟失时 , 釆取比特映射参量码本子 集规则 codebookSubsetRestriction给定的最低的 RI值来计算。 特别的, 当第一个反 馈周期的 RI信息丟失时, 将没有可以参考的最后反馈的 RI信息, 那么第 一个反馈周期的 PMI和 CQI信息则釆取可能存在最小 RI值来计算。 其中, 比特映射参量码本子集规则( codebookSubsetRestriction ) 由高层配置获得。
在 LTE-A***中反馈信道状态信息时, 包括 CSI反馈模式 1和 CSI反 馈模式 2。 其中, 在 CSI反馈模式 1时, RI信息和 il信息联合编码, 在同 一个子帧内以相对较长的周期进行传输。 而 CQI信息和 i2信息在另外的子 帧以相对较短的周期进行传输。 具体如图 1所示。 在 CSI反馈模式 2时, RI信息独立编码, 在一个子帧内以相对较长的周期进行传输; CQI信息与 il和 i2在另一个子帧以相对较短的周期进行传输。 具体如图 2所示。
图 3为本发明信道状态信息反馈方法的流程图, 如图 3所示, 包括: 步骤 300: UE确定信道状态信息。 其中, 信道状态信息包括以下信息 之一或任意组合: RI信息、 CQI信息、 PMI信息。
其中, 所述 CQI信息和 PMI信息分别由 RI信息计算获得。
本步骤中, PMI信息包括: il信息和 /或 i2信息。 其中, CQI信息或 i2 信息分别是由 RI和 il联合信息计算获得的;
或者, il信息是由 RI信息计算获得; i2信息是由 RI信息计算获得; CQI信息是由 RI信息计算获得;
或者, CQI信息是由 RI为 1计算获得;
其中, 可以釆用 RI信息和 il信息联合编码, 也可以釆用 RI信息独立 编码。
步骤 301 : 通过 PUCCH向基站周期反馈确定的信道状态信息。
LTE-A***中, 反馈信道状态信息时可以包括 CSI反馈模式 1和 CSI 反馈模式 2。 其中, 在 CSI反馈模式 1时, 也就是信道状态信息包括 RI信 息、 CQI信息、 PMI信息时, RI信息和 il信息联合编码, 在同一个子帧内 以相对较长的周期进行传输; 而 CQI信息和 i2信息在另外的子帧以相对较 短的周期进行传输, 也就是说, RI信息和 il信息联合编码存在于同一个报 告类型中, 而 i2信息和 CQI信息存在于同一个报告类型中, 具体如图 1所 示, 图 1为 LTE-A中下行周期反馈时 CSI反馈模式 1的反馈示意图;
在 CSI反馈模式 2时, RI信息独立编码, 在一个子帧内以相对较长的 周期进行传输; CQI信息、 il和 i2在另一个子帧以相对较短的周期进行传 输, 也就是说, RI信息存在于一个 4艮告类型中, 而 il信息、 i2信息和 CQI 信息存在于同一个 4艮告类型中, 具体如图 2所示, 图 2为 LTE-A中下行周 期反馈时 CSI反馈模式 2的反馈示意图。
本步骤中, 反馈确定的信道状态信息具体包括:
UE根据最后反馈的 RI值和最后反馈的 il信息,共同计算得到 CQI信 息和 i2信息, 并将得到的 CQI信息和 i2信息反馈给基站; 或者,
UE才艮据最后反馈的 RI值, 计算得到 CQI信息、 il信息和 i2信息, 并 将得到的 CQI信息、 il信息和 i2信息反馈给基站; 或者,
UE根据比特映射参数码本子集规则中的最低 RI值和固定 il值, 共同 计算得到 CQI信息和 i2信息, 并将得到的 CQI信息和 i2信息反馈给基站; 或者,
UE根据比特映射参数码本子集规则中的最低 RI值和最后反馈的 il信 息, 共同计算得到 CQI信息和 i2信息, 并将得到的 CQI信息和 i2信息反 馈给基站; 或者,
UE根据比特映射参数码本子集规则中的最低 RI值, 计算得到 CQI信 息、 il信息和 i2信息,并将得到的 CQI信息、 il信息和 i2信息反馈给基站; 或者,
UE根据最后反馈的 RI值和固定 il值, 共同计算得到 CQI信息和 i2 信息, 并将得到的 CQI信息和 i2信息反馈给基站; 或者, UE根据 RI取值为 1来计算得到 CQI信息, 并将得到的 CQI信息反馈 给基站。
上述通过确定用于计算 CQI信息和 i2信息的 RI信息或和 il信息的方 式, 在 RI信息、 或 RI与 il联合信息丟失时, 保证了正常反馈 CQI和 /或 i2 信息, 从而保证了整个通信***的正常运行。
本步骤具体实现手段是本领域技术人员容易获得的, 并且不用于限定 本发明的保护范围, 这里不再赘述。
本发明方法之前还包括: 基站向 UE发送导频, 该导频用于 UE估计下 行信道 UE根据导频信号估计下行信道。 具体实现属于本领域技术人员惯 用技术手段, 这里不再赘述。
对应本发明方法还提供中信道状态信息反馈装置, 如图 4所述, 至少 包括处理模块和反馈模块, 其中,
处理模块, 用于确定信道状态信息, 其中, 信道状态信息包括以下信 息之一或任意组合: RI信息、 CQI信息、 PMI信息。 具体用于: PMI信息 包括 il信息和 /或 i2信息; 对 RI信息和 il信息进行联合编码, 根据 RI信 息和 il联合信息计算获得 CQI信息或 i2信息; 或者,对 RI信息独立编码, 根据 RI信息计算获得 CQI信息、 il信息和 i2信息; 或者, 根据 RI取值为 1计算获得 CQI信息。
反馈模块, 用于通过 PUCCH向基站周期返回确定的信道状态信息。 所述处理模块, 具体用于:
根据最后反馈的 RI值和最后反馈的 il信息, 共同计算得到 CQI信息 和 i2信息, 并将得到的 CQI信息和 i2信息输出给反馈模块; 或者,
才艮据最后反馈的 RI值, 计算得到 CQI信息、 il信息和 i2信息, 并将 得到的 CQI信息、 il信息和 i2信息输出给反馈模块; 或者,
根据比特映射参数码本子集规则中的最低 RI值和固定 il值,共同计算 得到 CQI信息和 i2信息, 并将得到的 CQI信息和 i2信息输出给反馈模块; 或者,
根据比特映射参数码本子集规则中的最低 RI值和最后反馈的 il信息, 共同计算得到 CQI信息和 i2信息, 并将得到的 CQI信息和 i2信息输出给 反馈模块; 或者,
根据比特映射参数码本子集规则中的最低 RI值, 计算得到 CQI信息、 il信息和 i2信息,并将得到的 CQI信息、 il信息和 i2信息输出给反馈模块; 其中, 所述比特映射参数码本子集规则是由高层配置获得; 或者,
才艮据最后反馈的 RI值和固定 il值,共同计算得到 CQI信息和 i2信息, 并将得到的 CQI信息和 i2信息输出给反馈模块; 或者,
根据 RI取值为 1来计算得到 CQI信息, 并将得到的 CQI信息输出给 反馈模块。
本发明信道状态信息装置可以设置在 UE中。
下面结合实施例对本发明方法进行详细描述。
实施例一, 假设在 LTE-A通信***中, 在 PUCCH上周期反馈信道状 态信息, 如图 1所示, 当釆用反馈模式 1-1 , 且 RI与 il联合编码的方式时, UE反馈信道状态信息包括 RI信息、 il信息、 i2信息和 CQI信息。
在实施例一中, RI信息和 il信息联合编码, 在同一个子帧内以相对较 长的周期进行传输; CQI信息和 i2信息在另外的子帧以相对较短的周期进 行传输。 信道状态信息中的 CQI信息和 i2信息是 居最后反馈的 RI和 il 联合信息计算得到的。 当反馈的 Rl/il信息丟失时, 特别地, 在之前所有反 馈的 RI和 il联合信息都丟失时, UE按照如下方法之一计算并反馈信道状 态信息:
UE根据比特映射参数码本子集规则中的最低 RI值和固定 il值, 共同 计算得到 CQI信息和 i2信息, 并将得到的 CQI信息和 i2信息反馈给基站; 或者,
UE根据比特映射参数码本子集规则中的最低 RI值, 计算得到 CQI信 息、 il信息和 i2信息,并将得到的 CQI信息、 il信息和 i2信息反馈给基站; 或者,
UE根据 RI取值为 1来计算得到 CQI信息, 并将得到的 CQI信息反馈 给基站。
实施例二, 假设在 LTE-A***中, 在 PUCCH上周期反馈信道状态信 息, 如图 2所示, 当釆用反馈模式 1-1 , 且由 CSI反馈模式 2向 CSI反馈模 式 1切换时, UE反馈信道状态信息包括 RI信息、 il信息、 i2信息和 CQI 信息。
在实施例二中, CSI反馈模式 1是指 RI信息和 il信息联合编码, 在同 一个子帧内以相对较长的周期进行传输; CQI信息和 i2信息在另外的子帧 以相对较短的周期进行传输。 CSI反馈模式 2是指 RI信息独立编码, 在一 个子帧内以相对较长的周期进行传输; CQI信息与 il和 i2在另一个子帧以 相对较短的周期进行传输。
其中, 在 CSI反馈模式 2时, 信道状态信息中的 CQI信息、 il信息、 i2信息分别都是根据最后反馈的 RI信息计算得到的;在 CSI反馈模式 1时, 信道状态信息中的 CQI信息、 i2信息分别是根据最后反馈的 RI和 il联合 信息计算得到的。 特别地, 当转换为 CSI反馈模式 1后, 当反馈的 Rl/il联 合信息丟失时, 特别的, 当之前所有反馈的 RI和 il联合信息都丟失时, UE按照如下方法之一计算并反馈信道状态信息:
UE根据最后反馈的 RI值和最后反馈的 il信息,共同计算得到 CQI信 息和 i2信息, 并将得到的 CQI信息和 i2信息反馈给基站; 或者,
UE才艮据最后反馈的 RI值, 计算得到 CQI信息、 il信息和 i2信息, 并 将得到的 CQI信息、 il信息和 i2信息反馈给基站; 或者,
UE根据比特映射参数码本子集规则中的最低 RI值和固定 il值, 共同 计算得到 CQI信息和 i2信息, 并将得到的 CQI信息和 i2信息反馈给基站; 或者, UE根据比特映射参数码本子集规则中的最低 RI值和最后反馈的 il信 息, 共同计算得到 CQI信息和 i2信息, 并将得到的 CQI信息和 i2信息反 馈给基站; 或者,
UE根据比特映射参数码本子集规则中的最低 RI值, 计算得到 CQI信 息、 il信息和 i2信息,并将得到的 CQI信息、 il信息和 i2信息反馈给基站; 或者,
UE根据最后反馈的 RI值和固定 il值, 共同计算得到 CQI信息和 i2 信息, 并将得到的 CQI信息和 i2信息反馈给基站; 或者,
UE根据 RI取值为 1来计算得到 CQI信息, 并将得到的 CQI信息反馈 给基站。
以上所述, 仅为本发明的较佳实施例而已, 并非用于限定本发明的保 护范围, 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

权利要求书
1、 一种信道状态信息反馈方法, 其特征在于, 包括以下步骤: 用户终端 UE确定信道状态信息; 其中,信道状态信息包括以下信息之 一或任意组合: 秩指示符 RI信息、 信道质量指示 CQI信息、 预编码矩阵指 示符 PMI信息;
通过物理上行控制信道 PUCCH向基站周期反馈确定的信道状态信息。
2、 根据权利要求 1所述的信道状态信息反馈方法, 其特征在于, 所述 CQI信息和 PMI信息分别由 RI信息计算获得。
3、 根据权利要求 1或 2所述的信道状态信息反馈方法, 其特征在于, 所述 PMI信息包括:第一预编码矩阵指示符信息 il和 /或第二预编码矩阵指 示符信息 i2。
4、 根据权利要求 3所述的信道状态信息反馈方法, 其特征在于, 所述 通过 PUCCH向基站周期反馈确定的信道状态信息包括:
所述信道状态信息包括 RI信息、 CQI信息、 PMI信息时, 所述 RI信 息和第一预编码矩阵指示符信息 il联合编码, 存在于同一个报告类型中; 所述 CQI信息和第二预编码矩阵指示符信息 i2,存在于另一个报告类型中; 或者,所述 RI信息独立编码,存在于一个 告类型中; 所述 CQI信息、 第一预编码矩阵指示符信息 il和第二预编码矩阵指示符信息 i2, 存在于另 一个报告类型中;
或者, 所述 CQI信息独立存在于一个报告类型中。
5、 根据权利要求 3所述的信道状态信息反馈方法, 其特征在于, 所述 反馈确定的信道状态信息具体包括:
所述 UE根据最后反馈的 RI值和最后反馈的第一预编码矩阵指示符信 息 il , 共同计算得到 CQI信息和第二预编码矩阵指示符信息 i2, 并将得到 的 CQI信息和第二预编码矩阵指示符信息 i2反馈给基站; 或者, 所述 UE根据最后反馈的 RI值, 计算得到 CQI信息、 第一预编码矩阵 指示符信息 il和第二预编码矩阵指示符信息 i2, 并将得到的 CQI信息、 第 一预编码矩阵指示符信息 il和第二预编码矩阵指示符信息 i2反馈给基站; 或者,
所述 UE根据比特映射参数码本子集规则中的最低 RI值和固定第一预 编码矩阵指示符信息 il值, 共同计算得到 CQI信息和第二预编码矩阵指示 符信息 i2信息,并将得到的 CQI信息和第二预编码矩阵指示符信息 i2反馈 给基站; 或者,
所述 UE根据比特映射参数码本子集规则中的最低 RI值和最后反馈的 第一预编码矩阵指示符信息 il , 共同计算得到 CQI信息和第二预编码矩阵 指示符信息 i2, 并将得到的 CQI信息和第二预编码矩阵指示符信息 i2反馈 给基站; 或者,
所述 UE根据比特映射参数码本子集规则中的最低 RI值,计算得到 CQI 信息、 第一预编码矩阵指示符信息 il和第二预编码矩阵指示符信息 i2, 并 将得到的 CQI信息、 第一预编码矩阵指示符信息 il和第二预编码矩阵指示 符信息 i2反馈给基站; 其中, 所述比特映射参数码本子集规则由高层配置 得到; 或者,
所述 UE才艮据最后反馈的 RI值和固定第一预编码矩阵指示符信息 il值, 共同计算得到 CQI信息和第二预编码矩阵指示符信息 i2 , 并将得到的 CQI 信息和第二预编码矩阵指示符信息 i2反馈给基站; 或者,
所述 UE才艮据 RI取值为 1来计算得到 CQI信息,并将得到的 CQI信息 反馈给基站。
6、 一种信道状态信息反馈装置, 其特征在于, 至少包括: 处理模块和 反馈模块, 其中,
处理模块, 用于确定信道状态信息, 其中, 信道状态信息包括以下信 息之一或任意组合: RI信息、 CQI信息、 PMI信息; 反馈模块, 用于通过 PUCCH向基站周期反馈确定的信道状态信息。
7、 根据权利要求 6所述的信道状态信息装置, 其特征在于, 所述处理 模块, 还用于接收来自基站的导频, 并根据导频信号估计下行信道。
8、 根据权利要求 6或 7所述的信道状态信息反馈装置, 其特征在于, 所述 PMI信息包括第一预编码矩阵指示符信息 il和第二预编码矩阵指示符 信息 i2; 所述处理模块, 具体用于:
对所述 RI信息和第一预编码矩阵指示符信息 il 进行联合编码, 根据 RI和第一预编码矩阵指示符信息 il联合信息计算获得 CQI信息或第二预编 码矩阵指示符信息 i2; 或者,
对所述 RI信息独立编码, 根据 RI编码信息计算获得第一预编码矩阵指示 符信息 il和 CQI信息、 第二预编码矩阵指示符信息 i2; 或者,
根据 RI取值为 1 来计算获得 CQI信息。
9、 根据权利要求 8所述的信道状态信息反馈装置, 其特征在于, 所述 处理模块具体用于:
根据最后反馈的 RI值和最后反馈的第一预编码矩阵指示符信息 il , 共 同计算得到 CQI信息和第二预编码矩阵指示符信息 i2, 并将得到的 CQI信 息和第二预编码矩阵指示符信息 i2输出给反馈模块; 或者,
根据最后反馈的 RI值, 计算得到 CQI信息、 第一预编码矩阵指示符信 息 il和第二预编码矩阵指示符信息 i2 , 并将得到的 CQI信息、 第一预编码 矩阵指示符信息 il和第二预编码矩阵指示符信息 i2输出给反馈模块;或者, 根据比特映射参数码本子集规则中的最低 RI值和固定第一预编码矩阵 指示符信息 il值,共同计算得到 CQI信息和第二预编码矩阵指示符信息 i2, 并将得到的 CQI信息和第二预编码矩阵指示符信息 i2输出给反馈本模块; 或者,
根据比特映射参数码本子集规则中的最低 RI值和最后反馈的第一预编 码矩阵指示符信息 il , 共同计算得到 CQI信息和第二预编码矩阵指示符信 息 i2 , 并将得到的 CQI信息和第二预编码矩阵指示符信息 i2输出给反馈模 块; 或者,
根据比特映射参数码本子集规则中的最低 RI值, 计算得到 CQI信息、 第一预编码矩阵指示符信息 il和第二预编码矩阵指示符信息 i2, 并将得到 的 CQI信息、 第一预编码矩阵指示符信息 il和第二预编码矩阵指示符信息 i2 输出给反馈模块; 其中, 所述比特映射参数码本子集规则由高层配置得 到; 或者,
才艮据最后反馈的 RI值和固定第一预编码矩阵指示符信息 il值,共同计 算得到 CQI信息和第二预编码矩阵指示符信息 i2, 并将得到的 CQI信息和 第二预编码矩阵指示符信息 i2输出给反馈模块; 或者,
根据 RI取值为 1来计算得到 CQI信息, 并将得到的 CQI信息输出给 反馈模块。
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