WO2012022249A1 - 一种信道状态信息csi反馈指示方法和基站及系统 - Google Patents

一种信道状态信息csi反馈指示方法和基站及系统 Download PDF

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Publication number
WO2012022249A1
WO2012022249A1 PCT/CN2011/078447 CN2011078447W WO2012022249A1 WO 2012022249 A1 WO2012022249 A1 WO 2012022249A1 CN 2011078447 W CN2011078447 W CN 2011078447W WO 2012022249 A1 WO2012022249 A1 WO 2012022249A1
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Prior art keywords
feedback mode
csi
base station
feedback
independent
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English (en)
French (fr)
Inventor
潘学明
沈祖康
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China Academy of Telecommunications Technology CATT
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China Academy of Telecommunications Technology CATT
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Priority to EP11817776.5A priority Critical patent/EP2575278B1/en
Priority to KR1020127031549A priority patent/KR101462415B1/ko
Priority to US13/701,018 priority patent/US8750237B2/en
Publication of WO2012022249A1 publication Critical patent/WO2012022249A1/zh
Anticipated expiration legal-status Critical
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Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W48/00Access restriction; Network selection; Access point selection
    • H04W48/08Access restriction or access information delivery, e.g. discovery data delivery
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00Arrangements for detecting or preventing errors in the information received
    • H04L1/0001Systems modifying transmission characteristics according to link quality, e.g. power backoff
    • H04L1/0023Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the signalling
    • H04L1/0026Transmission of channel quality indication
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04BTRANSMISSION
    • H04B7/00Radio transmission systems, i.e. using radiation field
    • H04B7/02Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H04B7/0613Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
    • H04B7/0615Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal
    • H04B7/0619Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal using feedback from receiving side
    • H04B7/0621Feedback content
    • H04B7/0626Channel coefficients, e.g. channel state information [CSI]
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04BTRANSMISSION
    • H04B7/00Radio transmission systems, i.e. using radiation field
    • H04B7/02Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H04B7/0613Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
    • H04B7/0615Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal
    • H04B7/0619Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal using feedback from receiving side
    • H04B7/0636Feedback format
    • H04B7/0645Variable feedback
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04BTRANSMISSION
    • H04B7/00Radio transmission systems, i.e. using radiation field
    • H04B7/02Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H04B7/0613Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
    • H04B7/0615Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal
    • H04B7/0619Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal using feedback from receiving side
    • H04B7/0658Feedback reduction
    • 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
    • H04L1/0027Scheduling of signalling, e.g. occurrence thereof
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00Arrangements affording multiple use of the transmission path
    • H04L5/0001Arrangements for dividing the transmission path
    • H04L5/0003Two-dimensional division
    • H04L5/0005Time-frequency
    • H04L5/0007Time-frequency the frequencies being orthogonal, e.g. OFDM(A) or DMT
    • H04L5/001Time-frequency the frequencies being orthogonal, e.g. OFDM(A) or DMT the frequencies being arranged in component carriers
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00Arrangements affording multiple use of the transmission path
    • H04L5/003Arrangements for allocating sub-channels of the transmission path
    • H04L5/0053Allocation of signalling, i.e. of overhead other than pilot signals
    • H04L5/0055Physical resource allocation for ACK/NACK
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00Arrangements affording multiple use of the transmission path
    • H04L5/003Arrangements for allocating sub-channels of the transmission path
    • H04L5/0053Allocation of signalling, i.e. of overhead other than pilot signals
    • H04L5/0057Physical resource allocation for CQI
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00Arrangements for detecting or preventing errors in the information received
    • H04L1/12Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/18Automatic repetition systems, e.g. Van Duuren systems
    • H04L1/1829Arrangements specially adapted for the receiver end
    • H04L1/1854Scheduling and prioritising arrangements

Definitions

  • the present invention relates to the field of wireless communication technologies, and in particular, to a channel state information CSI feedback indication method, a base station, and a system. Background technique
  • the UE User Equipment
  • the CSI includes RI ( Rank Indication) information, CQI (Channel Quality Indicator) information, and PMI (Precoding Matrix Indicator) information.
  • the specific feedback may be periodically fed back using a PUCCH (Physical Uplink Control Channel), or may be aperiodic feedback using a PUSCH (Physical Uplink Share Channel).
  • PUCCH Physical Uplink Control Channel
  • PUSCH Physical Uplink Share Channel
  • the RI information is separately encoded, the CQI + PMI information is separately encoded, and the ACK/NACK information is also separately encoded.
  • These uplink control information are multiplexed together with the uplink data, as shown in FIG. After multiplexing and interleaving, the mapping of the uplink data symbols to the physical resources is performed, the CQI/PMI information is mapped first, and the uplink data is mapped to the remaining resources.
  • ACK/NACK and RI information are obtained by puncturing the uplink data. Four columns of symbols on both sides of the pilot are placed in the time domain and the frequency domain is ACK/NACK from low frequency to high frequency, followed by ACK/NACK. The column symbol first maps the RI information from the low frequency to the high frequency in the post-frequency domain, as shown in Figure 2.
  • the aperiodic CSI transmission in the PUSCH is through the UL grant. Triggered by the lbit CQI request message in the Uplink grant (uplink grant indication). When the UE checks that the CQI request is set to 1, the related CSI information is organized and transmitted in the PUSCH according to the pre-configured feedback mode, otherwise it is not sent.
  • LTE-Advanced system in order to support a wider system bandwidth than the LTE system, such as 100 MHz, it is necessary to connect resources of multiple LTE carriers (also referred to as component carriers) in two ways:
  • a plurality of consecutive LTE carriers are aggregated to provide a larger transmission bandwidth for LTE-A; 2) a plurality of discontinuous LTE carriers are aggregated to provide a larger transmission bandwidth for LTE-A.
  • a plurality of discontinuous LTE carriers are aggregated to provide a larger transmission bandwidth for LTE-A.
  • an example of discontinuous carrier aggregation is given.
  • the research orientation of the standardization organization is that the consensus for the design of the carrier aggregation system is that the design on each carrier remains as consistent as possible with LTE Rel-8, thereby ensuring that the terminal of the LTE Rel-8 system can work normally on each component carrier.
  • the research requirements of the LTE-A system have been formulated to support aggregation of up to five component carriers, and one UE supports the maximum reception/transmission of data on five component carriers at the same time.
  • Symmetrical and asymmetric carrier aggregation can be configured from a system perspective, that is, the system supports uplink and downlink symmetric or asymmetric carrier configurations; it can also be allocated based on the UE, that is, one UE is allocated as uplink and downlink symmetric or asymmetric. Carrier configuration.
  • One downlink carrier can be paired with one or more uplink carriers, and the other uplink carrier can also be paired with one or more downlink carriers. .
  • the pairing relationship is as shown in FIG. 4A and FIG. 4B.
  • An arrow connection between the uplink carrier and the downlink carrier indicates that there is a pairing relationship between the two, and a pair of downlink/uplink carriers having a link relationship is called a Cell. (Cell), the uplink-downlink carrier correspondence in each Cell is sent to all terminals in the Cell through system broadcast.
  • LTE-A Rel-10 supports uplink and downlink symmetric and asymmetric carrier configurations from the perspective of the UE.
  • UE1 is configured as a carrier configuration with uplink and downlink symmetry.
  • the carrier pairing relationship between the two cells is broadcast in the respective system messages.
  • the content is the same.
  • UE2 is configured as an uplink and downlink asymmetric carrier configuration.
  • the link relationship between the UL CC3 and the DL CC (Downlink Component Carrier) 3 is valid for the UE, and the DL CC4
  • the link relationship is invalid for the UE, and the DL CC4 is referred to as the isolated downlink member carrier "Standalone DL CC".
  • the number of uplink and downlink carriers in the system is symmetric, and has a corresponding link relationship, and a UE is allocated an asymmetric number of uplink and downlink carriers in the system, as shown in FIG.
  • the DL CC2 in the figure is also called "Standalone DL CC". This configuration is also supported by LTE-A Rel-10.
  • the terminal with the uplink and downlink symmetric aggregation capability and the asymmetric aggregation capability will be reported in the Rel-10.
  • the terminal reports its uplink and downlink carrier aggregation capability to the base station in the initial access process. .
  • the base station cannot exceed the uplink and downlink carrier aggregation capability of the terminal.
  • a carrier activation/deactivation scheme is introduced in the LTE-A Rel-10, and the activation and deactivation of the downlink carrier is triggered by the MAC CE (MAC Control Element), and the UE performs CSI only on the activated DL CC. Measurement and feedback.
  • MAC CE MAC Control Element
  • LTE Rel-8 aperiodic CSI feedback is triggered by the CQI request 1 bit information bit in the UL Grant.
  • CQI request 1 bit design in the UL grant follows LTE Rel-8 and is not extended or modified.
  • the specific multi-carrier non-periodic CSI feedback schemes are as follows:
  • Method 1 Simultaneous feedback of aperiodic CSI information of multiple DL CCs
  • the CQI request 1 bit information in the UL grant triggers the UE to place the non-period CSI information of all activated DL CCs in the PUSCH of the UL grant scheduling and feed back.
  • This solution is the simplest, but the disadvantage is that the feedback overhead is large. Especially when the UE configures multiple downlink component carriers (maximum 5) and the physical resources of the PUSCH scheduling are small, the PUSCH transmission performance has a large impact.
  • Method 2 The aperiodic CSI information of each DL CC is separately fed back, and is specifically divided into the following two types of methods. This method avoids the feedback overhead caused by simultaneously feeding back CSI information of multiple DL CCs, but has corresponding limitations. Sex. Method 2-1: CQI request 1 bit information in the UL grant, triggering the UE to send the aperiodic CSI information of the DL CC transmitting the UL grant by the network side, and placing the feedback in the PUSCH scheduled by the UL grant.
  • a dotted arrow indicates a configuration of uplink cross-carrier scheduling, that is, PUSCH transmission of UL CC1 and UL CC2 are both UL on DL CC1.
  • Grant scheduling according to the existing conclusion, at this time, DL CC2 does not send UL grant, and its acyclic CSI feedback of DL CC2 cannot be triggered;
  • the isolated downlink component carrier will not transmit UL grant, so its aperiodic CSI feedback cannot be triggered either;
  • Method 2-2 CQI request 1 bit information in the UL grant, triggering the UE to place the aperiodic CSI information of the DL CC having the system level pairing link relationship with the UL grant scheduled UL CC in the PUSCH of the UL grant scheduling. .
  • the embodiments of the present invention provide a CSI feedback indication and feedback method, a UE, a base station, and a wireless communication system, and provide a CSI feedback scheme suitable for application to a multi-carrier system.
  • the present invention provides a CSI feedback indication method, including:
  • the base station configures a CSI feedback mode according to the UE.
  • the base station sends the configured CSI feedback mode to the UE by using the configuration signaling, and indicates the CSI feedback mode used when the UE reports the CSI aperiodically.
  • the invention also provides a CSI feedback method, including:
  • the UE receives the configuration signaling sent by the base station, and acquires a CSI feedback mode configured by the base station for the UE.
  • the CSI is used to feed back the CSI for the CSI feedback mode configured by the base station.
  • the invention also provides a base station, comprising:
  • a feedback mode configuration unit configured to configure a CSI feedback mode for the UE
  • the feedback mode indication unit is configured to send the configured CSI feedback mode to the UE by using configuration signaling, and indicate a CSI feedback mode that is used when the UE reports the CSI aperiodically.
  • the present invention also provides a UE, including:
  • a feedback mode acquiring unit configured to receive configuration signaling sent by the base station, and obtain a CSI feedback mode configured by the base station for the UE;
  • the CSI feedback unit is configured to: when the aperiodic CSI is triggered to be triggered, use the CSI feedback mode that the base station configures to feed back CSI.
  • the invention also provides a wireless communication system, comprising:
  • the base station is configured to configure a CSI feedback mode for the UE, and send the configured CSI feedback mode to the UE by using the configuration signaling, and indicate a CSI feedback mode that is used when the UE reports the CSI aperiodically;
  • the UE receives the configuration signaling sent by the base station, and obtains the CSI feedback mode configured by the base station for the UE, and determines that the CSI feedback mode is used to feed the CSI to the CSI when the aperiodic CSI is reported.
  • the CSI feedback indication and feedback method, the UE, the base station, and the wireless communication system provided by the present invention have the following beneficial effects:
  • the base station can select an appropriate aperiodic CSI feedback mode according to the carrier configuration of the system or the terminal, thereby improving system design flexibility. . DRAWINGS
  • 1 is a flow chart of multiplexing uplink control information and uplink data in the prior art
  • FIG. 2 is a schematic diagram of mapping of uplink control information on uplink physical resources in the prior art
  • FIG. 3 is a schematic diagram of carrier aggregation used in an LTE-A system
  • FIG. 4A is a schematic diagram of an asymmetric configuration of uplink and downlink carriers given from a link relationship of a system perspective
  • FIG. 4B is a schematic diagram of a symmetric configuration of uplink and downlink carriers given from a link relationship of a system perspective
  • FIG. 5 is a perspective given from a UE perspective. Schematic diagram of asymmetric/symmetric configuration of uplink and downlink carriers
  • FIG. 6 is a schematic diagram of asymmetric configuration of uplink and downlink carriers from the perspective of UE
  • FIG. 7 is a flowchart of a CSI feedback indication method according to an embodiment of the present invention
  • FIG. 8 is a flowchart of a CSI feedback method according to an embodiment of the present invention.
  • FIG. 9 is a structural diagram of a base station according to an embodiment of the present invention.
  • FIG. 10 is a structural diagram of a UE according to an embodiment of the present invention. detailed description
  • the base station needs to obtain CSI feedback of multiple DL CCs measured by the UE, thereby performing multi-carrier scheduling.
  • the CSI fed back by the UE may include, for example, RI information, CQI information, and broadband PMI information, where the CQI includes a wideband CQI and a subband CQI.
  • the CQI request 1 bit design in the UL grant in the existing multi-carrier system follows the LTE Rel-8, and the specific multi-carrier aperiodic CSI feedback scheme has its own advantages and disadvantages, and is applicable to different systems or carrier configuration of the UE.
  • the invention provides a CSI feedback indication method. As shown in Figure 7, the method includes:
  • Step S701 The base station configures a CSI feedback mode for the UE.
  • the terminal in the LTE-A Rel-10 system will have the uplink and downlink symmetric aggregation capability and the non-symmetric aggregation capability.
  • the terminal will report its uplink and downlink carrier aggregation capability to the base station in the initial access process.
  • the base station cannot exceed the uplink and downlink carrier aggregation capabilities of the terminal.
  • the base station configures a corresponding CSI feedback mode for the UE according to the carrier configuration of the UE in the multi-carrier system.
  • the base station can flexibly design a CSI feedback mode suitable for the UE carrier configuration according to the carrier configuration of the UE.
  • the CSI feedback mode can be selected in combination with the scenario, and the system design flexibility is increased on the one hand.
  • Step S702 The base station sends the configured CSI feedback mode to the UE by using configuration signaling, and indicates a CSI feedback mode that is used when the UE reports the CSI aperiodically.
  • the present invention enables the base station to select a suitable aperiodic C SI feedback mode for the UE in different scenarios, avoiding the disadvantages of using a feedback mechanism in the prior art and not being able to flexibly design the CSI feedback mode of the system. defect.
  • the CSI feedback mode suitable for the UE is selected by the base station according to the carrier configuration of the UE.
  • the CSI feedback mode suitable for the UE is selected from the existing CSI feedback mode. Configuring any feedback mode selected in the feedback mode, where the system configuration mode includes a joint feedback mode and a first independent feedback mode, or the system configuration mode includes a joint feedback mode and a second independent feedback mode, or the system configuration
  • the feedback method includes a joint feedback method, a first independent feedback method, and a second independent feedback method, where:
  • the CSI of all activated DL CCs of the UE is placed in the PUSCH of the UL grant scheduling feedback;
  • the advantage of the feedback mode is that the CSI can be fed back.
  • the disadvantage is that the feedback overhead is large. Therefore, although it is not suitable for configuring the feedback mode for all UEs, it is suitable for UEs that cannot fully feed back the CSI for other feedback methods.
  • the advantage of the feedback mode is that the aperiodic CSI information of each DL CC is separately fed back, which avoids the feedback overhead caused by simultaneously feeding back CSIs of multiple DL CCs, but has the disadvantage of being unsuitable for channel quality between DL CCs configured by the UE. If the difference is greater than the set threshold, the base station configures an application scenario for cross-carrier scheduling.
  • the CSI of the DL CC having the system-level pairing link relationship with the UL grant scheduled UL CC is placed in the PUSCH of the UL grant scheduling feedback.
  • the advantage of the feedback mode is that the aperiodic CSI information of each DL CC is separately fed back, which avoids the feedback overhead caused by simultaneously feeding back CSIs of multiple DL CCs, but the disadvantages are on the uplink and downlink of the UE.
  • the wave is asymmetrically configured, the acyclic CSI information of the DL CC cannot be fully fed back.
  • a specific application scenario may be selected, and other feedback modes suitable for the UE may be selected.
  • the base station selects the CSI feedback mode that is most suitable for the UE according to the advantages and disadvantages of the specific feedback mode, and notifies the UE by configuration signaling.
  • the foregoing configuration signaling in this embodiment may be RRC (Radio Resource Control) signaling (cell-specific or UE-specific), or MAC CE signaling specific to the UE, or the UE.
  • a dedicated PDCCH (Physical Downlink Control Channel) signaling can also be the signaling of the CSI feedback mode of the newly defined feedback configuration.
  • the implementation of the CSI feedback mode configured by the configuration signaling may be performed by setting corresponding identification information for different feedback modes, and carrying the CSI feedback mode identification information of the corresponding configuration in the configuration signaling.
  • the following describes the carrier configuration of the UE in the embodiment of the present invention and the manner in which the various feedback modes are used to configure the CSI.
  • the first independent feedback mode or the second independent feedback mode is configured for the UE.
  • the base station sends the UL grant DL CC.
  • CSI a first independent feedback mode that is placed in the PUSCH scheduled by the UL grant;
  • the UE places the CSI of the DL CC with the system-level pairing link relationship with the UL grant scheduled UL CC. Feedback in the PUSCH scheduled by the UL grant.
  • the CSI of the UL grant DL CC is not sent without feedback using the paired DL CC. Moreover, due to the symmetrical configuration of the upper and lower carriers, there is no case where the CSI of the isolated DL CC is not fed back.
  • the following configuration manner may also be adopted: when the channel quality difference between the DL CCs configured by the UE meets the setting requirement, the first independent configuration is configured for the UE. Feedback mode or second independent feedback mode; between the DL CCs configured by the UE When the channel quality difference does not meet the setting requirement, the second independent feedback mode is configured for the UE.
  • the base station determines that the channel quality difference between the plurality of DL CCs configured to the UE is relatively large, cross-carrier scheduling is performed. As shown in FIG. 5, when the base station determines that the interference between DL CC1 and DL CC2 of UE1 is relatively serious, the UL grant of the scheduled UL CC2 that should be transmitted in the DL CC2 is transmitted across the carrier on the DL CC1. If the channel quality between the DL CCs is quite different, the second independent feedback method described above can be used. Otherwise, the first independent feedback method can be used and the CSI information can be well fed back.
  • the base station can determine whether the UE uses the first independent feedback mode or the second feedback mode according to the channel quality difference between the DL CCs configured by the UE.
  • a joint feedback mode is configured for the UE.
  • the CSI information of the isolated DL CC cannot be fed back to the UE that is asymmetrically configured for the uplink and downlink carriers, and the second independent feedback mode is used to forward the CSI information of the isolated DL CC.
  • the UE uses the joint feedback method. Since the number of asymmetric UEs in the system is limited, the system does not cause large resource overhead.
  • the manner of the CSI configured by the UEs in different CC configurations is not limited to the foregoing manners in the embodiments of the present invention.
  • the configuration may be flexibly configured according to the advantages and disadvantages of each feedback mode.
  • the two independent feedback modes may also select only one type for configuration.
  • the CSI feedback mode configured by the base station includes two types: a joint feedback mode and an independent feedback mode.
  • the base station when the base station can notify the UE of the CSI feedback mode by using configuration signaling, when the carrier configuration of the UE is updated or other information is updated, and the CSI feedback mode most suitable for the UE needs to be reselected, the base station may The CSI feedback mode configuration update is performed in real time and the UE is notified.
  • a CSI feedback method is provided, as shown in FIG. 8, including:
  • Step S801 the UE receives the configuration signaling sent by the base station, and acquires, by the base station, the configuration of the UE.
  • CSI feedback method
  • the manner of configuring the signaling may be specifically RRC signaling (cell-specific or UE-specific), or MAC CE signaling specific to the UE, or PDCCH signaling specific to the UE. Of course, it may also be the signaling of the CSI feedback mode of the newly defined feedback configuration.
  • Step S802 When the UE determines to trigger the aperiodic CSI reporting, the CSI is used to feed back the CSI for the CSI feedback mode configured by the base station.
  • the UE determines to trigger the aperiodic CSI report, and may use the design of the LTE Rel-8, and specifically includes: the UE determines to trigger the aperiodic CSI reporting when the CQI request in the UL grant is set according to the UL grant sent by the base station. When the CQI request in the UL grant is not set, the acyclic CSI report is not performed.
  • the UE feeds back the CSI according to the CSI feedback mode indicated by the base station, and avoids the shortcomings of the UE uniformly reporting the CSI in the same feedback manner.
  • the UE uses the CSI feedback mode feedback CSI configured by the base station, which includes:
  • the UE places the CSI of all the activated DL CCs in the PUSCH of the UL grant scheduling feedback;
  • the UE Determining, when the CSI feedback mode configured by the base station for the UE is the first independent feedback mode, the UE sends the CSI of the DL CC of the UL grant by the base station, and places the feedback in the PUSCH scheduled by the UL grant;
  • the UE places the CSI of the DL CC with the system-level pairing link relationship with the UL grant scheduled UL CC, and places the PUSCH in the UL grant scheduling. Feedback.
  • the CSI feedback manner acquired by the UE is a first independent feedback manner or a second independent feedback manner.
  • the CSI feedback mode acquired by the UE is the first independent feedback mode or the second independent feedback, when the UL CC of the UE is symmetrically configured with the DL CC, and the channel quality difference between the DL CCs configured by the UE meets the setting requirement.
  • the UL CC of the UE is symmetrically configured with the DL CC, and the UE is configured When the channel quality difference between the configured DL CCs does not meet the setting requirement, the CSI feedback mode acquired by the UE is the second independent feedback mode.
  • the CSI feedback mode acquired by the UE is a joint feedback mode.
  • the LTE Rel-8 can be used to determine the specific information in the feedback CSI. Specifically, the CSI information corresponding to the number of bits is selected and fed back according to the feedback mode configured by the base station for the UE.
  • the UE uses the PUSCH for aperiodic feedback.
  • the CSI has a variety of different feedback modes.
  • the specific CQI/PMI feedback mode definitions are shown in Table 1:
  • the optional feedback mode in each transmission mode is limited, as specified below, where
  • Which feedback mode the UE specifically uses in a certain transmission mode is configured by the base station through higher layer signaling.
  • the transmission mode corresponds to an optional feedback mode:
  • Transmission mode 1 Feedback mode 2-0, feedback mode 3-0;
  • Transmission mode 2 feedback mode 2-0, feedback mode 3-0;
  • Transmission mode 3 feedback mode 2-0, feedback mode 3-0;
  • Transmission mode 4 feedback mode 1-2, feedback mode 2-2, feedback mode 3-1;
  • Transmission mode 5 feedback mode 3-1;
  • Transmission mode 6 feedback mode 1-2, feedback mode 2-2, feedback mode 3-1;
  • Transmission mode 7 Feedback mode 2-0, feedback mode 3-0.
  • Transmission mode 1 single antenna port, using port 0;
  • Transmission mode 2 transmit diversity
  • Transmission mode 3 open loop spatial multiplexing
  • Transmission mode 4 closed loop spatial multiplexing
  • Transmission mode 5 MU-MIMO (Multiuser-Multiple Input Multiple Output)
  • Transmission mode 7 single antenna port, using port 5;
  • RI In LTE Rel-8, RI only feeds back in transmission mode 3 and transmission mode 4.
  • RI is lbits information.
  • the RI fed back when the base station is configured with 4 antenna ports is 2 bits of information.
  • the number of defined subbands is related. The base station first interprets the RI information in the PUSCH, and interprets the CQI/PMI information according to the corresponding RANK layer number according to the corresponding format.
  • the following uses the bit length corresponding to the feedback mode 1-2, the feedback mode 2-0, the feedback mode 2-2, the feedback mode 3-0, and the feedback mode 3-1 when the UE feeds back the CQI/PMI on the PUSCH.
  • feedback mode 1-2 is a "wideband CQI+ multi-channel mode, including wideband CQI information of 1-2 spatial codewords (4 bits per codeword) and N subband PMI information, where N is the system.
  • the number of sub-bands is as follows: The specific information is shown in Table 2:
  • the feedback mode 2-0 is "the UE selects the subband CQI+ no ,, as shown in Table 3, the wideband CQI information bits including one codeword) and the differential CQI information (2 bits) of the M subband selected by the UE, Where L is the subband number indication information for selecting M subbands from the N subbands, and the values of N and M are both standard specifications and system bandwidth.
  • Feedback mode 2-2 is the "UE select subband + multi PMI" mode, as shown in Table 4, including 1-2 spatial codewords of wideband CQI information (each 4bits) and 1-2 spatial codewords.
  • the UE selects differential CQI information (each 2 bits) of M subbands and a subband PMI+-wideband PMI information.
  • the feedback mode 3-0 is "high-level configuration sub-band CQI+ no ⁇ , as shown in Table 5, including a wideband CQI information bits) and N sub-band differential CQI information (2bits each).
  • Feedback mode 3-1 is the "high-level configuration sub-band CQI + single ⁇ mode, as shown in Table 6, wide-band CQI information containing 1-2 spatial code words (each 4bits) and 1-2 spatial code words N
  • the subbands have differential CQI information (each 2 bits) and one PMI information.
  • a base station is provided. As shown in FIG. 9, the method includes: a feedback mode configuration unit 901, configured to configure a CSI feedback mode for the UE, and a feedback mode indication unit 902, configured to configure signaling Sending the configured CSI feedback mode to the UE, indicating the CSI feedback mode used by the UE when reporting the CSI aperiodically.
  • a feedback mode configuration unit 901 configured to configure a CSI feedback mode for the UE
  • a feedback mode indication unit 902 configured to configure signaling Sending the configured CSI feedback mode to the UE, indicating the CSI feedback mode used by the UE when reporting the CSI aperiodically.
  • the feedback mode configuration unit 901 is specifically configured to configure a corresponding CSI feedback mode for the UE according to the carrier configuration of the UE.
  • the feedback mode configuration unit 901 is specifically configured to configure a CSI feedback mode for the UE in a feedback manner selected by the system configuration feedback mode, where the system configuration mode includes a joint feedback mode and a first independent feedback mode, or The system configuration manner includes a joint feedback manner and a second independent feedback manner, or the system configuration feedback manner includes a joint feedback manner, a first independent feedback manner, and a second independent feedback manner.
  • the joint feedback mode is specifically: the CSI of all the activated DL CCs of the UE is placed in the PUSCH of the UL grant scheduling feedback; the first independent feedback mode is specifically, the CSI of the DL CC that sends the UL grant by the base station is placed in the UL grant scheduling. Feedback in PUSCH; second independent feedback The method is specifically that the CSI of the DL CC having the system-level pairing link relationship with the UL grant scheduled UL CC is placed in the PUSCH of the UL grant scheduling feedback.
  • the feedback mode configuration unit 901 is specifically configured to configure a first independent feedback mode or a second independent feedback mode for the UE when the UL CC and the DL CC of the UE are symmetrically configured.
  • the feedback mode configuration unit 901 is specifically configured to: when the UL CC and the DL CC of the UE are symmetrically configured, and the channel quality difference between the DL CCs configured by the UE meets the setting requirement, configure the first independent a feedback mode or a second independent feedback mode; when the UL CC of the UE is symmetrically configured with the DL CC, and the channel quality difference between the DL CCs configured by the UE does not meet the setting requirement, configuring the second independent feedback for the UE the way.
  • the feedback mode configuration unit 901 is specifically configured to configure a joint feedback mode for the UE when the UL CC and the DL CC of the UE are configured in a non-symmetric manner.
  • the configuration signaling used by the feedback mode indication unit 902 is RRC signaling, or MAC CE signaling specific to the UE, or PDCCH signaling specific to the UE.
  • a UE is provided in the embodiment of the present invention.
  • the method includes: a feedback mode acquiring unit 101, configured to receive configuration signaling sent by a base station, and obtain a CSI feedback mode configured by the base station for the UE.
  • the CSI feedback unit 102 is configured to: when the aperiodic CSI is triggered to be triggered, use the CSI feedback mode configured by the base station to feed back CSI.
  • the CSI feedback unit 102 is specifically configured to determine to trigger the aperiodic CSI reporting when the CQI request in the UL grant is set according to the UL grant sent by the base station.
  • the CSI feedback unit 102 is specifically configured to: when the CSI feedback mode configured by the base station for the UE is the joint feedback mode, the CSI of all the activated DL CCs is placed in the PUSCH of the UL grant scheduling feedback; determining the base station When the CSI feedback mode configured for the UE is the first independent feedback mode, the CSI of the DL CC in which the base station sends the UL grant is placed in the PUSCH scheduled by the UL grant, and the CSI configured by the base station for the UE is determined. When the feedback mode is the second independent feedback mode, the CSI of the DL CC having the system-level pairing link relationship with the UL grant scheduled UL CC is placed in the PUSCH of the UL grant scheduling feedback.
  • the feedback mode obtaining unit 101 acquires when the UL CC and the DL CC of the UE are symmetrically configured.
  • the CSI feedback mode is the first independent feedback mode or the second independent feedback mode.
  • the feedback mode obtaining unit 101 is configured by the first independent feedback mode or the second when the UL CC of the UE is symmetrically configured with the DL CC, and the channel quality of the DL CC configured by the UE meets the setting requirement.
  • the acquired CSI feedback mode is the second independent feedback mode.
  • the feedback mode obtaining unit 101 obtains the CSI feedback mode in the joint feedback mode when the UL CC and the DL CC of the UE are asymmetrically configured.
  • a wireless communication system is further provided in the embodiment of the present invention, including: a base station, configured to configure a CSI feedback mode for the UE, and configured to send the configured CSI feedback mode to the UE by using configuration signaling, indicating that the UE is not periodically reported.
  • the CSI feedback mode used by the CSI the UE receives the configuration signaling sent by the base station, acquires the CSI feedback mode configured by the base station for the UE, and determines to trigger the base station when the aperiodic CSI is triggered. Feedback CSI is fed back to the CSI feedback mode configured for it.
  • the base station in the embodiment of the present invention may specifically use the base station provided in the foregoing embodiment, where
  • the UE may specifically use the UE provided in the foregoing embodiment.
  • the present invention provides a scheme for multi-carrier CSI feedback using PUSCH in a multi-carrier system.
  • the base station can select a suitable aperiodic CSI feedback mode according to the carrier configuration information of the UE and the carrier configuration of the system, thereby increasing the flexibility of the system design.
  • the spirit and scope of the invention Thus, it is intended that the present invention cover the modifications and variations of the inventions

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Description

一种信道状态信息 CSI反馈指示方法和基站及系统 本申请要求在 2010年 8月 16日提交中国专利局、申请号为 201010255329.4、 发明名称为"一种信道状态 CSI反馈指示方法和基站及系统,,的中国专利申请 的优先权, 其全部内容通过引用结合在本申请中。 技术领域
本发明涉及无线通信技术领域, 尤其涉及一种信道状态信息 CSI反馈指 示方法和基站及系统。 背景技术
在 LTE ( Long Term Evolution, 长期演进) Rel-8系统中, 仅支持单个载 波的传输, 因此 UE ( User Equipment, 用户终端)也仅对单个下行载波的信 道质量进行测量, 并反馈测量结果 CSI ( Channel State Information, 信道状态 信息)。 CSI包括 RI ( Rank Indication, 秩指示)信息、 CQI ( Channel Quality Indicator, 信道质量指示)信息、 PMI ( Precoding Matrix Indicator, 预编码矩 阵索引) 信息等。 具体的反馈可以使用 PUCCH ( Physical Uplink Control Channel, 物理上行控制信道)进行周期性反馈,也可以使用 PUSCH ( Physical Uplink Share Channel, 物理上行共享信道)进行非周期反馈。
在 PUSCH中非周期传输 CSI时, RI信息单独编码、 CQI + PMI信息单独 编码, ACK/NACK信息也是单独编码, 这些上行控制信息一起与上行数据进 行复用, 如图 1 所示。 复用和交织之后, 进行上行数据符号至物理资源的映 射, 先映射 CQI/PMI信息, 再在剩余资源映射上行数据。 ACK/NACK 以及 RI信息是通过对上行数据进行打孔映射的, 在导频两侧的四列符号先时域后 频域从低频到高频放置 ACK/NACK、 紧挨着 ACK/NACK的四列符号先时域 后频域从低频到高频映射 RI信息, 如图 2所示。
在 LTE Rel-8 系统中, PUSCH中的非周期的 CSI发送是通过 UL grant ( Uplink grant, 上行调度指示)中的 lbit CQI request信息触发的。 UE查收到 CQI request置位为 1 , 则按照预先配置的反馈模式组织相关的 CSI信息插入 PUSCH中发送, 否则不发送。
对于 LTE-Advanced 系统, 为支持比 LTE 系统更宽的系统带宽, 比如 100MHz, 需要通过将多个 LTE载波(又称成员载波) 的资源连接起来使用, 具体有两种方式:
1 )将多个连续的 LTE载波进行聚合, 为 LTE-A提供更大的传输带宽; 2 )将多个不连续的 LTE载波进行聚合, 为 LTE-A提供更大的传输带宽。 如图 3所示, 给出了不连续载波聚合的例子。
目前标准化组织的研究倾向为, 对于载波聚合系统设计的共识是每个载 波上的设计保持与 LTE Rel-8尽量一致, 从而保证 LTE Rel-8系统的终端能够 在每一个成员载波上正常工作。
目前 LTE-A系统研究需求已经制定, 最大支持 5个成员载波的聚合, 并 且, 一个 UE最大支持在 5个成员载波上同时接收 /发送数据。
在载波聚合的研究中, 已经决定支持上下行非对称以及对称的载波聚合。 对称和非对称的载波聚合可以是系统角度配置的, 即系统中支持上下行对称 或非对称的载波配置; 也可以是基于 UE进行分配的, 即一个 UE被分配为上 下行对称或非对称的载波配置。
同时, 在载波聚合的研究中, 讨论了上行载波和下行载波之间的配对关 系问题, 一个下行载波可以与一个或多个上行载波配对, 反之一个上行载波 也可以与一个或多个下行载波配对。从系统角度看, 这种配对关系如图 4A和 图 4B所示, 上行载波和下行载波之间有箭头连接表示两者存在配对关系, 其 中具有链接关系的一对下行 /上行载波称为一个 Cell (小区 ),每个 Cell中的上 下行载波对应关系通过系统广播发给该 Cell内的所有终端。
LTE-A Rel-10从 UE角度支持上下行对称和非对称的载波配置, 如图 5 所示, UE1配置为上下行对称的载波配置, 两个 Cell的载波配对链接关系与 各自系统消息中广播的内容相同。 UE2 配置为上下行非对称的载波配置, 此 时一个 UL CC ( Uplink Component Carrier, 上行成员载波)仅能够归属于一个 Cell之中, UL CC3与 DL CC ( Downlink Component Carrier, 下行成员载波) 3的链接关系对于该 UE有效,而与 DL CC4的链接关系对于该 UE是无效的, 此时 DL CC4称为孤立下行成员载波 " Stand alone DL CC"。
另外一种情况是, 系统角度上下行载波个数是对称的, 且具有——对应 的链接关系, 而一个 UE在系统中被分配了不对称的上下行载波个数, 如图 6 所示,此时也称图中 DL CC2为 "Stand alone DL CC" ,这种配置情况也是 LTE-A Rel-10需要支持的。
根据 LTE-A Rel-10终端能力的讨论, Rel-10中将存在具有上下行对称聚 合能力和非对称聚合能力的终端, 终端在初始接入过程中将自己的上下行载 波聚合能力上报给基站。 基站在进行下行和上行载波配置时, 不能超过该终 端的上下行载波聚合能力。
LTE-A Rel-10 中引入了载波激活 /去激活的方案, 通过 MAC CE ( MAC Control Element, 媒体接入层控制单元)触发下行载波的激活和去激活, UE 仅对激活的 DL CC进行 CSI的测量和反馈。
在 LTE Rel-8中, 非周期 CSI反馈通过 UL Grant中的 CQI request 1比特 信息位触发。 在 LTE-A的讨论过程中, 大部分观点认为 UL grant中的 CQI request 1比特设计沿用 LTE Rel-8, 不进行扩展或修改, 而具体的多载波非周 期 CSI反馈方案有如下几种:
方法 1 : 多个 DL CC的非周期 CSI信息同时反馈;
UL grant中的 CQI request 1比特信息触发 UE将所有激活的 DL CC的非 周期 CSI信息放置在该 UL grant调度的 PUSCH中一并反馈。这种方案最为简 单, 但缺点是反馈开销较大, 特别是在 UE配置了多个下行成员载波(最大 5 个 )时且 PUSCH调度的物理资源较小时,对 PUSCH传输性能有较大的影响。
方法 2: 每个 DL CC的非周期 CSI信息单独反馈, 具体又分为如下两类 方法,这类方法避免了同时反馈多个 DL CC的 CSI信息带来的反馈开销问题, 但也有相应的局限性。 方法 2-1: UL grant中的 CQI request 1比特信息, 触发 UE将网络侧发送 UL grant的 DL CC的非周期 CSI信息, 放置在该 UL grant调度的 PUSCH中 反馈。
该方法的问题在于: 1 )对于配置了跨载波调度的 UE, 如图 5中的 UE1 , 虚线箭头表示上行跨载波调度的配置, 即 UL CC1和 UL CC2的 PUSCH发送 都被 DL CC1上的 UL grant调度,根据现有结论,此时 DL CC2不发送 UL grant, 其 DL CC2的非周期 CSI反馈无法被触发; 2 )根据现有结论, 孤立下行成员 载波将不发送 UL grant, 因此其非周期 CSI反馈也无法被触发;
方法 2-2: UL grant中的 CQI request 1比特信息,触发 UE将与该 UL grant 调度的 UL CC具有系统级配对链接关系的 DL CC的非周期 CSI信息放置在该 UL grant调度的 PUSCH中发送。
该方法的问题是, 对于处于上下行非对称载波配置情况下的 UE, 其部分 DL CC的非周期 CSI无法反馈, 例如图 5中 UE 2的 DL CC4和图 6中 UE 3 的 DL CC2。 发明内容
本发明实施例提供一种 CSI反馈指示及反馈方法、 UE和基站及无线通信 系统, 给出适于应用于多载波系统的 CSI反馈方案。
本发明提供一种 CSI反馈指示方法, 包括:
基站根据为 UE配置 CSI反馈方式;
所述基站通过配置信令将配置的 CSI反馈方式发送给所述 UE, 指示所述 UE非周期上报 CSI时釆用的 CSI反馈方式。
本发明还提供一种 CSI反馈方法, 包括:
UE接收基站发送的配置信令, 获取所述基站为所述 UE配置的 CSI反馈 方式;
所述 UE确定触发非周期 CSI上报时, 釆用所述基站为其配置的 CSI反 馈方式反馈 CSI。 本发明还提供一种基站, 包括:
反馈方式配置单元, 用于为 UE配置 CSI反馈方式;
反馈方式指示单元, 用于通过配置信令将配置的 CSI反馈方式发送给所 述 UE, 指示所述 UE非周期上报 CSI时釆用的 CSI反馈方式。
本发明还提供一种 UE, 包括:
反馈方式获取单元, 用于接收基站发送的配置信令, 获取所述基站为所 述 UE配置的 CSI反馈方式;
CSI反馈单元, 用于确定触发非周期 CSI上报时, 釆用所述基站为其配 置的 CSI反馈方式反馈 CSI。
本发明还提供一种无线通信系统, 包括:
基站, 为所述 UE配置 CSI反馈方式; 通过配置信令将配置的 CSI反馈 方式发送给所述 UE, 指示所述 UE非周期上报 CSI时釆用的 CSI反馈方式;
UE,接收所述基站发送的配置信令, 获取所述基站为所述 UE配置的 CSI 反馈方式, 确定触发非周期 CSI上报时, 釆用所述基站为其配置的 CSI反馈 方式反馈 CSI。
利用本发明提供的 CSI反馈指示及反馈方法、 UE和基站及无线通信系统, 具有以下有益效果: 基站可以根据系统或者终端的载波配置情况, 选择合适 的非周期 CSI反馈方式, 提高系统设计灵活性。 附图说明
图 1为现有技术中上行控制信息与上行数据复用的流程图;
图 2为现有技术中上行控制信息在上行物理资源上的映射示意图; 图 3为 LTE-A系统中釆用的载波聚合的示意图;
图 4A为从系统角度的链接关系给出的上下行载波非对称配置的示意图; 图 4 B为从系统角度的链接关系给出的上下行载波对称配置的示意图; 图 5为从 UE角度给出的上下行载波非对称 /对称配置的示意图; 图 6为从 UE角度上下行载波非对称配置的示意图; 图 7为依照本发明实施例的 CSI反馈指示方法流程图;
图 8为依照本发明实施例的 CSI反馈方法流程图;
图 9为依照本发明实施例的基站结构图;
图 10为依照本发明实施例的 UE的结构图。 具体实施方式
下面结合附图和实施例对本发明提出的 CSI反馈指示及反馈方法、 UE和 基站及无线通信系统, 进行更详细地说明。
为了在 LTE-A载波聚合系统中有效的执行载波调度和链路自适应过程, 基站需要获得 UE测量的多个 DL CC的 CSI反馈, 以此进行多载波调度。 其 中 UE反馈的 CSI可以包括, 例如 RI信息、 CQI信息和宽带 PMI信息等, 其 中 CQI包括宽带 CQI和子带 CQI。
现有多载波系统中 UL grant中的 CQI request 1比特设计沿用 LTE Rel-8, 而具体的多载波非周期 CSI反馈方案各有优缺点, 且适用于不同的系统或者 UE的载波配置情况, 本发明提供一种 CSI反馈指示方法。 如图 7所示, 该方 法包括:
步骤 S701 , 基站为 UE配置 CSI反馈方式;
如前所述, LTE-A Rel-10 系统中将存在具有上下行对称聚合能力和非对 称聚合能力的终端, 终端在初始接入过程中将自己的上下行载波聚合能力上 报给基站。 基站在进行下行和上行载波配置时, 不能超过该终端的上下行载 波聚合能力。
本实施例基站根据多载波系统中 UE的载波配置情况,为 UE配置相应的 CSI反馈方式。本实施例中基站根据 UE的载波配置情况, 可以灵活设计适于 该 UE载波配置情况的 CSI反馈方式, 一方面可以结合场景选择较优的 CSI 反馈方式, 一方面增加了系统设计灵活性。
步骤 S702, 所述基站通过配置信令将配置的 CSI反馈方式发送给所述 UE, 指示所述 UE非周期上报 CSI时釆用的 CSI反馈方式。 本发明使得基站可以选择在不同的场景下配置 UE釆用适合的非周期 C SI 反馈方式, 避免了现有技术中釆用一种反馈机制所存在的缺点且无法灵活设 计系统的 CSI反馈方式的缺陷。
基站根据 UE的载波配置情况设计适于该 UE的 CSI反馈方式时,可以从 现有的 CSI反馈方式中选取适合该 UE的 CSI反馈方式, 优选地, 基站为 UE 配置的 CSI反馈方式为从系统配置反馈方式中选择的任一种反馈方式, 所述 系统配置方式包括联合反馈方式和第一独立反馈方式, 或所述系统配置方式 包括联合反馈方式和第二独立反馈方式, 或所述系统配置反馈方式包括联合 反馈方式、 第一独立反馈方式和第二独立反馈方式, 其中:
1 )联合反馈方式
具体为将 UE所有激活的 DL CC的 CSI,放置在 UL grant调度的 PUSCH 中反馈;
该反馈方式的优点是可以反馈比较全的 CSI,缺点是反馈开销较大,因此, 虽然不适于对所有 UE配置该反馈方式,但适于对个别釆用其它反馈方式无法 全面反馈 CSI的 UE。
2 )第一独立反馈方式
将基站发送 UL grant的 DL CC的 CSI,放置在该 UL grant调度的 PUSCH 中反馈;
该反馈方式的优点是将每个 DL CC的非周期 CSI信息单独反馈, 避免了 同时反馈多个 DL CC的 CSI带来的反馈开销问题, 但缺点是不适于 UE配置 的 DL CC间的信道质量相差较大, 如大于设定门限时, 基站配置了跨载波调 度的应用场景。
3 )第二独立反馈方式
将与 UL grant调度的 UL CC具有系统级配对链接关系的 DL CC的 CSI, 放置在该 UL grant调度的 PUSCH中反馈。
该反馈方式的优点是将每个 DL CC的非周期 CSI信息单独反馈, 避免了 同时反馈多个 DL CC的 CSI带来的反馈开销问题, 但缺点在 UE的上下行载 波非对称配置时无法全面反馈 DL CC的非周期 CSI信息。
因此, 本发明具体实施时可以结合具体的应用场景, 选择适合该 UE 的 到其它反馈方式。 不管具体是什么样反馈方式, 都由基站根据具体反馈方式 的优缺点, 选择最适于 UE的 CSI反馈方式, 并通过配置信令通知所述 UE。
本实施例中的上述配置信令, 具体可以为 RRC ( Radio Resource Control, 无线资源控制)信令(小区专属或者 UE专属 ), 或为所述 UE专属的 MAC CE 信令, 或为所述 UE专属的 PDCCH ( Physical Downlink Control Channel, 物 理下行控制信道)信令。 当然, 也可以是新定义反馈配置的 CSI反馈方式的 信令。 通过配置信令携带配置的 CSI反馈方式的实施, 具体可以是为不同反 馈方式设置对应的标识信息, 将对应配置的 CSI反馈方式的标识信息携带在 上述配置信令中。
下面给出本发明实施例中结合 UE 的载波配置情况及上述各种反馈方式 优选点为 UE配置 CSI的方式。
1 )对于上下载波配置对称的 UE
在 UE的 UL CC与 DL CC对称配置时, 如图 5中的 UE1 , 为 UE配置第 一独立反馈方式或第二独立反馈方式, 配置第一独立反馈方式时, 将基站发 送 UL grant的 DL CC的 CSI, 放置在该 UL grant调度的 PUSCH中反馈的第 一独立反馈方式; 配置第二独立反馈方式时, UE将与 UL grant调度的 UL CC 具有系统级配对链接关系的 DL CC的 CSI,放置在该 UL grant调度的 PUSCH 中反馈。
配置第二独立反馈方式时, 在跨载波调度时, 不会不反馈调度了 UL CC 而没有使用配对的 DL CC发送 UL grant的 DL CC的 CSI。且由于上下载波对 称配置, 也不会出现不反馈孤立 DL CC的 CSI的情况。
另外, 对于在所述 UE的 UL CC与 DL CC对称配置, 还可以釆用如下配 置方式: 在所述 UE配置的 DL CC间信道质量差异满足设定要求时, 为所述 UE配置第一独立反馈方式或第二独立反馈方式;在所述 UE配置的 DL CC间 信道质量差异不满足设定要求时, 为所述 UE配置第二独立反馈方式。
由于基站在确定到 UE配置的多个 DL CC之间信道质量相差比较大时, 会进行跨载波调度。 如图 5所示, 基站确定 UE1的 DL CC1和 DL CC2间干 扰比较严重时, 会将本来应该在 DL CC2发送的调度 UL CC2的 UL grant, 跨 载波在 DL CC1上发送。 如果 DL CC之间的信道质量相差较大, 可以釆用上 述第二独立反馈方式。 否则, 可以釆用第一独立反馈方式也可以很好地反馈 CSI信息。
因此本发明实施例基站可以根据 UE配置的 DL CC之间的信道质量差异 确定 UE釆用第一独立反馈方式还是第二反馈方式。
2 )对于上下行载波配置非对称的 UE
在 UE的 UL CC与 DL CC非对称配置时, 为 UE配置联合反馈方式。 由于对于上下行载波非对称配置的 UE, 不管釆用第一独立反馈方式还是 釆用第二独立反馈方式, 都无法反馈孤立 DL CC的 CSI信息, 因此本发明实 施例对上下载波配置非对称的 UE 釆用联合反馈方式。 由于系统中上下载波 配置非对称的 UE的数量有限, 因此不会造成较大的资源开销。
具体为不同 CC配置的 UE配置的 CSI的方式不限于本发明实施例给出上 述几种方式, 实际中有其他应用场景和其他反馈方式时, 可以根据各反馈方 式优缺点灵活配置。
另外, 所述两种独立反馈方式也可能只选取一种可供配置, 此时基站配 置的 CSI反馈方式包括联合反馈方式和独立反馈方式两种。
另外, 本发明实施例中由于基站可以通过配置信令通知 UE使用的 CSI 反馈方式,在 UE的载波配置情况发生更新或其它信息更新而需要重新选择最 适于 UE的 CSI反馈方式时, 基站可以实时进行 CSI反馈方式配置更新并通 知 UE。
依照本发明另一实施例中, 提供一种 CSI反馈方法, 如图 8 所示, 包 括:
步骤 S801 , UE接收基站发送的配置信令, 获取所述基站为所述 UE配置 的 CSI反馈方式;
该配置信令的方式具体可以是 RRC信令(小区专属或者 UE专属) , 或 为所述 UE专属的 MAC CE信令, 或为所述 UE专属的 PDCCH信令。 当然, 也可以是新定义反馈配置的 CSI反馈方式的信令。
步骤 S802, UE确定触发非周期 CSI上报时, 釆用所述基站为其配置的 CSI反馈方式反馈 CSI。
UE确定触发非周期 CSI上报, 可以沿用 LTE Rel-8的设计, 具体包括: 所述 UE根据所述基站发送的 UL grant,在 UL grant中的 CQI request置位时, 确定触发非周期 CSI上报。 在 UL grant中的 CQI request不置位时, 不进行非 周期 CSI上报。
UE根据基站的指示的 CSI反馈方式来反馈 CSI, 避免了 UE统一釆用同 一反馈方式上报 CSI所存在的缺点。
本发明实施例中 UE釆用所述基站为其配置的 CSI反馈方式反馈 CSI, 具 体包括:
确定所述基站为所述 UE配置的 CSI反馈方式为联合反馈方式时, UE将 所有激活的 DL CC的 CSI, 放置在 UL grant调度的 PUSCH中反馈;
确定所述基站为所述 UE配置的 CSI反馈方式为第一独立反馈方式时, UE将基站发送 UL grant的 DL CC的 CSI, 放置在该 UL grant调度的 PUSCH 中反馈;
确定所述基站为所述 UE配置的 CSI反馈方式为第二独立反馈方式时, UE将与 UL grant调度的 UL CC具有系统级配对链接关系的 DL CC的 CSI, 放置在该 UL grant调度的 PUSCH中反馈。
具体地, 所述 UE的 UL CC与 DL CC对称配置时, 所述 UE获取的 CSI 反馈方式为第一独立反馈方式或第二独立反馈方式。
或所述 UE的 UL CC与 DL CC对称配置,且所述 UE配置的 DL CC间信 道质量差异满足设定要求时,所述 UE获取的 CSI反馈方式为第一独立反馈方 式或第二独立反馈方式; 所述 UE的 UL CC与 DL CC对称配置, 且所述 UE 配置的 DL CC间信道质量差异不满足设定要求时, 所述 UE获取的 CSI反馈 方式为第二独立反馈方式。
所述 UE的 UL CC与 DL CC非对称配置时, 所述 UE获取的 CSI反馈方 式为联合反馈方式。
UE确定了 CSI的反馈方式时, 可以沿用 LTE Rel-8确定反馈的 CSI中的 具体信息。 具体地, 根据基站为 UE配置的反馈模式选择出相应比特数的 CSI 信息进行反馈。
在 LTE Rel-8系统中, UE使用 PUSCH进行非周期反馈 CSI有多种不同 的反馈模式, 具体的 CQI/PMI反馈模式定义如表 1所示:
表 1 CQI/PMI反馈模式
Figure imgf000013_0001
其中, 每种传输模式下可选的反馈模式是有限的, 具体规定如下, 其中
UE在某种传输模式下具体使用哪种反馈模式是由基站通过高层信令配置的。
传输模式对应可选的反馈模式:
传输模式 1 : 反馈模式 2-0, 反馈模式 3-0;
传输模式 2: 反馈模式 2-0, 反馈模式 3-0;
传输模式 3: 反馈模式 2-0, 反馈模式 3-0;
传输模式 4: 反馈模式 1-2, 反馈模式 2-2, 反馈模式 3-1 ;
传输模式 5: 反馈模式 3-1 ;
传输模式 6: 反馈模式 1-2, 反馈模式 2-2, 反馈模式 3-1 ;
传输模式 7: 反馈模式 2-0, 反馈模式 3-0。
这里, 7种传输模式分别为: 传输模式 1 : 单天线端口, 使用端口 0;
传输模式 2: 发射分集;
传输模式 3: 开环空间复用;
传输模式 4: 闭环空间复用;
传输模式 5: MU-MIMO ( Multiuser-Multiple Input Multiple Output, 用 尸 输入多输出);
传输模式 6: 闭环空间复用 (秩 RANK=1 );
传输模式 7: 单天线端口, 使用端口 5;
在 LTE Rel-8中, RI仅在传输模式 3和传输模式 4中进行反馈, 基站配 置 2天线端口时 RI为 lbits信息。 对于高等级的 UE, 在基站配置 4天线端口 时反馈的 RI为 2bits信息。 定义的子带个数等相关, 基站先解读 PUSCH 中的 RI信息, 根据解读出的 RANK的层数按照相应的格式解读 CQI/PMI信息。
下面对 UE在 PUSCH反馈 CQI/PMI时使用反馈模式 1-2、 反馈模式 2-0、 反馈模式 2-2、 反馈模式 3-0、 反馈模式 3-1对应的比特长度。
1 )反馈模式 1-2
如表 2所示, 反馈模式 1-2为 "宽带 CQI+多 ΡΜΓ 的方式, 包含 1-2个 空间码字的宽带 CQI信息 (每个码字 4bits )和 N个子带 PMI信息, 其中 N 为系统中的子带个数。 具体信息如表 2所示:
表 2反馈模式 1-2对应的比特数
Figure imgf000014_0001
2 )反馈模式 2-0 反馈模式 2-0为 "UE选择子带 CQI+无 ΡΜΓ 的方式, 如表 3所示, 包 含一个码字的宽带 CQI信息 bits ) 以及一个 UE选择的反映 M个子带的差 分 CQI信息 (2bits ), 其中 L为从 N个子带中选择出 M个子带的子带编号指 示信息, N与 M的数值都是标准规定与系统带宽有关。
反馈模式 2-0对应的比特数
Figure imgf000015_0001
3 )反馈模式 2-2
反馈模式 2-2为 "UE选择子带 +多 PMI "的方式, 如表 4所示, 包含 1-2 个空间码字的宽带 CQI信息(每个 4bits )和 1-2个空间码字的 UE选择 M个 子带的差分 CQI信息 (每个 2bits ) 以及一个子带 PMI+—个宽带 PMI信息。
表 4 反馈模式 2-2对应的比特数
Figure imgf000015_0002
4 )反馈模式 3-0
反馈模式 3-0为 "高层配置子带 CQI+无 ΡΜΓ 的方式, 如表 5所示, 包 含一个宽带的 CQI信息 bits )和 N个子带的差分 CQI信息 (每个 2bits )。
表 5反馈模式 3-0对应的比特数
Field 比特数
Figure imgf000016_0001
5 )反馈模式 3-1
反馈模式 3-1为 "高层配置子带 CQI+单 ΡΜΓ 的方式, 如表 6所示, 包 含 1-2个空间码字的宽带 CQI信息 (每个 4bits ) 以及 1-2个空间码字的 N个 子带差分 CQI信息 (每个 2bits ) 以及一个 PMI信息。
表 6反馈模式 3-1对应的比特数
Figure imgf000016_0002
依照本发明另一实施例中, 还提供一种基站, 如图 9所示, 包括: 反馈 方式配置单元 901 , 用于为 UE配置 CSI反馈方式; 反馈方式指示单元 902, 用于通过配置信令将配置的 CSI反馈方式发送给所述 UE, 指示所述 UE非周 期上报 CSI时釆用的 CSI反馈方式。
优选地,所述反馈方式配置单元 901具体用于根据所述 UE的载波配置情 况为 UE配置相应的 CSI反馈方式。
本实施例中所述反馈方式配置单元 901 具体用于从系统配置反馈方式中 选择的一种反馈方式为 UE配置 CSI反馈方式,所述系统配置方式包括联合反 馈方式和第一独立反馈方式, 或所述系统配置方式包括联合反馈方式和第二 独立反馈方式, 或所述系统配置反馈方式包括联合反馈方式、 第一独立反馈 方式和第二独立反馈方式。
上述联合反馈方式具体为将 UE所有激活的 DL CC的 CSI, 放置在 UL grant调度的 PUSCH中反馈; 第一独立反馈方式具体为将基站发送 UL grant 的 DL CC的 CSI, 放置在该 UL grant调度的 PUSCH中反馈; 第二独立反馈 方式具体为将与 UL grant调度的 UL CC具有系统级配对链接关系的 DL CC的 CSI, 放置在该 UL grant调度的 PUSCH中反馈。
所述反馈方式配置单元 901具体用于在所述 UE的 UL CC与 DL CC对称 配置时, 为所述 UE配置第一独立反馈方式或第二独立反馈方式。
或所述反馈方式配置单元 901具体用于在所述 UE的 UL CC与 DL CC对 称配置, 且所述 UE配置的 DL CC间信道质量差异满足设定要求时, 为所述 UE配置第一独立反馈方式或第二独立反馈方式; 在所述 UE的 UL CC与 DL CC对称配置, 且所述 UE配置的 DL CC间信道质量差异不满足设定要求时, 为所述 UE配置第二独立反馈方式。
所述反馈方式配置单元 901具体用于在所述 UE的 UL CC与 DL CC非对 称配置时, 为所述 UE配置联合反馈方式。
反馈方式指示单元 902釆用的所述配置信令为 RRC信令, 或为所述 UE 专属的 MAC CE信令, 或为所述 UE专属的 PDCCH信令。
依照本发明实施例中还提供一种 UE, 如图 10所示, 包括: 反馈方式获 取单元 101 , 用于接收基站发送的配置信令, 获取所述基站为所述 UE配置的 CSI反馈方式; CSI反馈单元 102, 用于确定触发非周期 CSI上报时, 釆用所 述基站为其配置的 CSI反馈方式反馈 CSI。
CSI反馈单元 102具体用于根据基站发送的 UL grant, 在 UL grant中的 CQI request置位时, 确定触发非周期 CSI上报。
CSI反馈单元 102, 具体用于确定所述基站为所述 UE配置的 CSI反馈方 式为联合反馈方式时, 将所有激活的 DL CC的 CSI, 放置在 UL grant调度的 PUSCH中反馈; 确定所述基站为所述 UE配置的 CSI反馈方式为第一独立反 馈方式时, 将基站发送 UL grant的 DL CC的 CSI, 放置在该 UL grant调度的 PUSCH中反馈; 确定所述基站为所述 UE配置的 CSI反馈方式为第二独立反 馈方式时,将与 UL grant调度的 UL CC具有系统级配对链接关系的 DL CC的 CSI, 放置在 UL grant调度的 PUSCH中反馈。
反馈方式获取单元 101在所述 UE的 UL CC与 DL CC对称配置时, 获取 的 CSI反馈方式为第一独立反馈方式或第二独立反馈方式。
或反馈方式获取单元 101在所述 UE的 UL CC与 DL CC对称配置,且所 述 UE配置的 DL CC间信道质量满足设定要求时, 获取的 CSI反馈方式为第 一独立反馈方式或第二独立反馈方式; 在所述 UE的 UL CC与 DL CC对称配 置, 且所述 UE配置的 DL CC间信道质量不满足设定要求时, 获取的 CSI反 馈方式为第二独立反馈方式。
反馈方式获取单元 101在所述 UE的 UL CC与 DL CC非对称配置时, 获 取的 CSI反馈方式为联合反馈方式。
依照本发明实施例中还提供一种无线通信系统, 包括: 基站, 为所述 UE 配置 CSI反馈方式; 通过配置信令将配置的 CSI反馈方式发送给所述 UE, 指 示所述 UE非周期上报 CSI时釆用的 CSI反馈方式; UE, 接收所述基站发送 的配置信令, 获取所述基站为所述 UE配置的 CSI反馈方式, 确定触发非周期 CSI上 4艮时, 釆用所述基站为其配置的 CSI反馈方式反馈 CSI。
本发明实施例中所述基站具体可以釆用上述实施例中提供的基站, 所述
UE具体可以釆用上述实施例中提供的 UE。
本发明给出了在多载波系统中利用 PUSCH进行多载波 CSI反馈的方案。 基站可以根据 UE 的载波配置信息同时还可以结合系统的载波配置情况选择 合适的非周期 CSI反馈方式, 增加了系统设计的灵活性。 发明的精神和范围。 这样, 倘若本发明的这些修改和变型属于本发明权利要 求及其等同技术的范围之内, 则本发明也意图包含这些改动和变型在内。

Claims

权 利 要 求
1、 一种信道状态信息 CSI反馈指示方法, 其特征在于, 包括:
基站为用户终端 UE配置 CSI反馈方式;
所述基站通过配置信令将配置的 CSI反馈方式发送给所述 UE, 指示所述 UE非周期上报 CSI时釆用的 CSI反馈方式。
2、 如权利要求 1所述的方法, 其特征在于, 所述基站为 UE配置 CSI反 馈方式, 具体包括:
所述基站根据所述 UE的载波配置情况为 UE配置相应的 CSI反馈方式。
3、 如权利要求 2所述的方法, 其特征在于, 所述基站为 UE配置的 CSI 反馈方式包括联合反馈方式和第二独立反馈方式;
所述联合反馈方式具体为将 UE所有激活的下行成员载波 DL CC的 CSI, 放置在上行调度指示 UL grant调度的物理上行共享信道 PUSCH中反馈;
所述第二独立反馈方式具体为将与 UL grant调度的上行成员载波 UL CC 具有系统级配对链接关系的 DL CC的 CSI,放置在该 UL grant调度的 PUSCH 中反馈。
4、 如权利要求 1所述的方法, 其特征在于, 所述配置信令为所述 UE专 属的物理下行控制信道 PDCCH信令。
5、 如权利要求 2所述的方法, 其特征在于, 所述基站为 UE配置的 CSI 反馈方式包括联合反馈方式和第一独立反馈方式; 或联合反馈方式、 第一独 立反馈方式和第二独立反馈方式;
所述联合反馈方式具体为将 UE所有激活的 DL CC的 CSI, 放置在 UL grant调度的 PUSCH中反馈;
所述第一独立反馈方式具体为将基站发送 UL grant的 DL CC的 CSI, 放 置在该 UL grant调度的 PUSCH中反馈;
所述第二独立反馈方式具体为将与 UL grant调度的 UL CC具有系统级配 对链接关系的 DL CC的 CSI, 放置在该 UL grant调度的 PUSCH中反馈。
6、 如权利要求 1所述的方法, 其特征在于, 所述配置信令为无线资源控 制 RRC信令, 或为所述 UE专属的媒体接入层控制单元 MAC CE信令。
7、 如权利要求 3或 5所述的方法, 其特征在于, 所述基站根据所述 UE 的载波配置情况为 UE配置相应的 CSI反馈方式, 具体包括:
在所述 UE的 UL CC与 DL CC对称配置时, 为所述 UE配置所述第一独 立反馈方式或所述第二独立反馈方式。
8、 如权利要求 3或 5所述的方法, 其特征在于, 所述基站根据所述 UE 的载波配置情况为 UE配置相应的 CSI反馈方式, 具体包括:
在所述 UE的 UL CC与 DL CC对称配置,且所述 UE配置的 DL CC间的 信道质量差异满足设定要求时,为所述 UE配置所述第一独立反馈方式或所述 第二独立反馈方式;
在所述 UE的 UL CC与 DL CC对称配置,且所述 UE配置的 DL CC间的 信道质量差异不满足设定要求时, 为所述 UE配置所述第二独立反馈方式。
9、 如权利要求 3或 5所述的方法, 其特征在于, 所述基站根据所述 UE 的载波配置信息, 为所述 UE配置 CSI反馈方式, 具体包括:
在所述 UE的 UL CC与 DL CC非对称配置时, 为所述 UE配置所述联合 反馈方式。
10、 一种信道状态信息 CSI反馈方法, 其特征在于, 包括:
用户终端 UE接收基站发送的配置信令, 获取所述基站为所述 UE配置的 CSI反馈方式;
所述 UE确定触发非周期 CSI上报时, 釆用所述基站为其配置的 CSI反 馈方式反馈 CSI。
11、 如权利要求 10所述的方法, 其特征在于, 所述 UE确定触发非周期 CSI上报, 具体包括:
所述 UE根据所述基站发送的上行调度指示 UL grant,在 UL grant中的信 道质量指示请求 CQI request置位时, 确定触发非周期 CSI上报。
12、 如权利要求 10所述的方法, 其特征在于, 所述 UE釆用所述基站为 其配置的 CSI反馈方式反馈 CSI, 具体包括:
确定所述基站为所述 UE配置的 CSI反馈方式为联合反馈方式时, 所述 UE将所有激活的下行成员载波 DL CC的 CSI,放置在上行调度指示 UL grant 调度的物理上行共享信道 PUSCH中反馈;
确定所述基站为所述 UE配置的 CSI反馈方式为第二独立反馈方式时,将 与 UL grant调度的上行成员载波 UL CC具有系统级配对链接关系的 DL CC的 CSI, 放置在该 UL grant调度的 PUSCH中反馈。
13、 如权利要求 10所述的方法, 其特征在于, 所述配置信令为所述 UE 专属的物理下行控制信道 PDCCH信令。
14、 如权利要求 10所述的方法, 其特征在于, 所述 UE釆用所述基站为 其配置的 CSI反馈方式反馈 CSI, 具体包括:
确定所述基站为所述 UE配置的 CSI反馈方式为第一独立反馈方式时,将 基站发送 UL grant的 DL CC的 CSI, 放置在该 UL grant调度的 PUSCH中反 馈。
15、 如权利要求 10所述的方法, 其特征在于, 所述配置信令为无线资源 控制 RRC信令, 或为所述 UE专属的媒体接入层控制单元 MAC CE信令。
16、 如权利要求 12或 14所述的方法, 其特征在于, 所述 UE的 UL CC 与 DL CC对称配置时, 所述 UE获取的 CSI反馈方式为第一独立反馈方式或 第二独立反馈方式。
17、 如权利要求 12或 14所述的方法, 其特征在于, 所述 UE的 UL CC 与 DL CC对称配置, 且所述 UE配置的 DL CC间信道质量差异满足设定要求 时,所述 UE获取的 CSI反馈方式为第一独立反馈方式或第二独立反馈方式; 所述 UE的 UL CC与 DL CC对称配置,且所述 UE配置的 DL CC间的信 道质量差异不满足设定要求时,所述 UE获取的 CSI反馈方式为第二独立反馈 方式。
18、 如权利要求 12或 14所述的方法, 其特征在于, 所述 UE的 UL CC 与 DL CC非对称配置时, 所述 UE获取的 CSI反馈方式为联合反馈方式。
19、 一种基站, 其特征在于, 包括:
反馈方式配置单元, 用于为用户终端 UE配置信道状态信息 CSI反馈方 式;
反馈方式指示单元, 用于通过配置信令将配置的 CSI反馈方式发送给所 述 UE, 指示所述 UE非周期上报 CSI时釆用的 CSI反馈方式。
20、 如权利要求 19所述的基站, 其特征在于, 所述反馈方式配置单元具 体用于根据所述 UE的载波配置情况为 UE配置相应的 CSI反馈方式。
21、 如权利要求 20所述的基站, 其特征在于, 所述反馈方式配置单元具 体用于为 UE配置联合反馈方式和第二独立反馈方式;
所述联合反馈方式具体为将 UE所有激活的下行成员载波 DL CC的 CSI, 放置在上行调度指示 UL grant调度的物理上行共享信道 PUSCH中反馈;
所述第二独立反馈方式具体为将与 UL grant调度的上行成员载波 UL CC 具有系统级配对链接关系的 DL CC的 CSI,放置在该 UL grant调度的 PUSCH 中反馈。
22、 如权利要求 19所述的基站, 其特征在于, 所述反馈方式指示单元釆 用的所述配置信令为所述 UE专属的物理下行控制信道 PDCCH信令。
23、 如权利要求 20所述的基站, 其特征在于, 所述反馈方式配置单元具 体用于为 UE配置联合反馈方式和第一独立反馈方式,或联合反馈方式、第一 独立反馈方式和第二独立反馈方式;
所述联合反馈方式具体为将 UE所有激活的 DL CC的 CSI, 放置在 UL grant调度的 PUSCH中反馈;
所述第一独立反馈方式具体为将基站发送 UL grant的 DL CC的 CSI, 放 置在该 UL grant调度的 PUSCH中反馈;
所述第二独立反馈方式具体为将与 UL grant调度的 UL CC具有系统级配 对链接关系的 DL CC的 CSI, 放置在该 UL grant调度的 PUSCH中反馈。
24、 如权利要求 19所述的基站, 其特征在于, 所述反馈方式指示单元釆 用的所述配置信令为无线资源控制 RRC信令, 或为所述 UE专属的媒体接入 层控制单元 MAC CE信令。
25、 如权利要求 21或 23所述的基站, 其特征在于, 所述反馈方式配置 单元具体用于在所述 UE的 UL CC与 DL CC对称配置时, 为所述 UE配置第 一独立反馈方式或第二独立反馈方式。
26、 如权利要求 21或 23所述的基站, 其特征在于, 所述反馈方式配置 单元具体用于在所述 UE的 UL CC与 DL CC对称配置,且所述 UE配置的 DL CC间信道质量差异满足设定要求时, 为所述 UE配置第一独立反馈方式或第 二独立反馈方式; 在所述 UE的 UL CC与 DL CC对称配置, 且所述 UE配置 的 DL CC间信道质量差异不满足设定要求时, 为所述 UE配置第二独立反馈 方式。
27、 如权利要求 21或 23所述的基站, 其特征在于, 所述反馈方式配置 单元具体用于在所述 UE的 UL CC与 DL CC非对称配置时, 为所述 UE配置 联合反馈方式。
28、 一种用户终端 UE, 其特征在于, 包括:
反馈方式获取单元, 用于接收基站发送的配置信令, 获取所述基站为所 述 UE配置的信道状态信息 CSI反馈方式;
CSI反馈单元, 用于确定触发非周期 CSI上报时, 釆用所述基站为其配 置的 CSI反馈方式反馈 CSI。
29、 如权利要求 28所述的 UE, 其特征在于, CSI反馈单元具体用于根据 所述基站发送的上行调度指示 UL grant, 在 UL grant中的信道质量指示请求 CQI request置位时, 确定触发非周期 CSI上报。
30、 如权利要求 28所述的 UE, 其特征在于, 所述 CSI反馈单元, 具体 用于确定所述基站为所述 UE配置的 CSI反馈方式为联合反馈方式时,将所有 激活的下行成员载波 DL CC的 CSI, 放置在上行调度指示 UL grant调度的物 理上行共享信道 PUSCH中反馈; 确定所述基站为所述 UE配置的 CSI反馈方 式为第二独立反馈方式时, 将与 UL grant调度的上行成员载波 UL CC具有系 统级配对链接关系的 DL CC的 CSI, 放置在 UL grant调度的 PUSCH中反馈。
31、 如权利要求 28所述的 UE, 其特征在于, 所述配置信令为所述 UE 专属的物理下行控制信道 PDCCH信令。
32、 如权利要求 28所述的 UE, 其特征在于, 所述 CSI反馈单元, 具体 用于确定所述基站为所述 UE配置的 CSI反馈方式为第一独立反馈方式时,将 基站发送 UL grant的 DL CC的 CSI, 放置在该 UL grant调度的 PUSCH中反 馈。
33、 如权利要求 28所述的 UE, 其特征在于, 所述配置信令为无线资源 控制 RRC信令, 或为所述 UE专属的媒体接入层控制单元 MAC CE信令。
34、 如权利要求 30或 32所述的 UE, 其特征在于, 所述反馈方式获取单 元在所述 UE的 UL CC与 DL CC对称配置时,获取的 CSI反馈方式为第一独 立反馈方式或第二独立反馈方式。
35、 如权利要求 30或 32所述的 UE, 其特征在于, 所述反馈方式获取单 元在所述 UE的 UL CC与 DL CC对称配置,且所述 UE配置的 DL CC间信道 质量差异满足设定要求时, 获取的 CSI反馈方式为第一独立反馈方式或第二 独立反馈方式; 在所述 UE的 UL CC与 DL CC对称配置, 且所述 UE配置的 DL CC间信道质量差异不满足设定要求时, 获取的 CSI反馈方式为第二独立 反馈方式。
36、 如权利要求 30或 32所述的 UE, 其特征在于, 所述反馈方式获取单 元在所述 UE的 UL CC与 DL CC非对称配置时,获取的 CSI反馈方式为联合 反馈方式。
37、 一种无线通信系统, 其特征在于, 包括:
基站,为用户终端 UE配置信道状态信息 CSI反馈方式; 通过配置信令将 配置的 CSI反馈方式发送给所述 UE, 指示所述 UE非周期上报 CSI时釆用的 CSI反馈方式;
UE,接收所述基站发送的配置信令, 获取所述基站为所述 UE配置的 CSI 反馈方式, 确定触发非周期 CSI上报时, 釆用所述基站为其配置的 CSI反馈 方式反馈 CSI。
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