WO2015149333A1 - 一种csi报告方法和设备 - Google Patents

一种csi报告方法和设备 Download PDF

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Publication number
WO2015149333A1
WO2015149333A1 PCT/CN2014/074740 CN2014074740W WO2015149333A1 WO 2015149333 A1 WO2015149333 A1 WO 2015149333A1 CN 2014074740 W CN2014074740 W CN 2014074740W WO 2015149333 A1 WO2015149333 A1 WO 2015149333A1
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Prior art keywords
subband size
subband
specific
size
configuration index
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PCT/CN2014/074740
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English (en)
French (fr)
Inventor
王建国
周永行
刘江华
Original Assignee
华为技术有限公司
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Publication date
Application filed by 华为技术有限公司 filed Critical 华为技术有限公司
Priority to CN201480000554.XA priority Critical patent/CN105229955A/zh
Priority to EP14888365.5A priority patent/EP3116155A4/en
Priority to KR1020167030377A priority patent/KR20160138563A/ko
Priority to PCT/CN2014/074740 priority patent/WO2015149333A1/zh
Publication of WO2015149333A1 publication Critical patent/WO2015149333A1/zh
Priority to US15/282,651 priority patent/US20170026953A1/en

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Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W72/00Local resource management
    • H04W72/20Control channels or signalling for resource management
    • H04W72/21Control channels or signalling for resource management in the uplink direction of a wireless link, i.e. towards the network
    • 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
    • H04B7/0632Channel quality parameters, e.g. channel quality indicator [CQI]
    • 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
    • H04B7/0639Using selective indices, e.g. of a codebook, e.g. pre-distortion matrix index [PMI] or for beam selection
    • 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
    • H04B7/066Combined feedback for a number of channels, e.g. over several subcarriers like in orthogonal frequency division multiplexing [OFDM]
    • 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
    • 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 signaling, i.e. of overhead other than pilot signals
    • 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 signaling, i.e. of overhead other than pilot signals
    • H04L5/0057Physical resource allocation for CQI
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W72/00Local resource management
    • H04W72/50Allocation or scheduling criteria for wireless resources
    • H04W72/51Allocation or scheduling criteria for wireless resources based on terminal or device properties

Definitions

  • the present invention relates to the field of communications, and in particular, to a channel state information (CSI) method and device.
  • CSI channel state information
  • Channel State Information generally describes channel conditions when transmitting on a specific bandwidth, which can be used for link adaptation and resource scheduling, and acquires channel characteristics to improve system throughput. It is vital.
  • the channel state information generally includes a Channel Quality Indicator (CQI).
  • CQI Channel Quality Indicator
  • the CQI is also calculated based on the precoding matrix used, which is usually indicated by one or more indexes. , such as a Precoding Matrix Indicator (PMI) and a precoding matrix layer or Rank Indication (RI).
  • PMI Precoding Matrix Indicator
  • RI Rank Indication
  • the CSI is usually fed back to the base station (BS) by the user equipment (User Equipment, UE).
  • UE User Equipment
  • Existing LTE systems feed back CSI information according to different frequency domain granularities.
  • the overall system bandwidth is divided into multiple subbands, the size of which is determined by the system bandwidth and reporting mode.
  • the base station or transmitter of the macrocellular system tends to be higher than the height of the surrounding building, while the base station or transmitter of the microcellular system is often located lower than the height of the surrounding building.
  • the above system design is mainly for communication with outdoor UEs, that is, the UEs considered are mainly distributed on the ground.
  • the UE needs to feed back CSI to the base station.
  • UEs in high UE density scenarios will be mainly distributed indoors, such as buildings in 2 to 8 floors.
  • the distance between the UE and the base station or the height of the UE is different, which will result in different multipath propagation between the UE and the base station, especially the multipath delay spread will be significantly different.
  • the sub-band size of the sub-band described by the CSI is determined by the system bandwidth and the reporting mode, the sub-band size determined for the UE configuration cannot be adapted to the above, which will result in different multipath propagation between the UE and the base station.
  • multipath delay spreads can be significantly different, resulting in reduced performance of the communication system. Summary of the invention
  • the embodiment of the invention provides a CSI reporting method and device, which can improve the performance of the communication system.
  • an embodiment of the present invention provides a CSI reporting method, including:
  • the CSI reflects a transmission on at least one subband, the subband being determined according to the subband size
  • determining, by using the UE-specific sub-band size configuration index, the sub-band size including:
  • An sub-band size is determined from the set of sub-band sizes according to the UE-specific sub-band size configuration index.
  • the sub-band size set is a cell-specific sub-band size set.
  • the method further includes:
  • the CSI includes a channel quality indicator CQI and a precoding matrix indicator PMI, and the subband used by the PMI
  • the size is N times the size of the subband used by the CQI, where the subband size used by the CQI is the subband size determined by the subband size configuration index, and the N is a positive integer.
  • the present invention provides a CSI reporting method, including:
  • subband size configuration information includes a UE-specific subband size configuration index
  • the sub-band is determined according to a sub-band size, and the sub-band size is determined according to the UE-specific sub-band size configuration index.
  • the method further includes:
  • the sub-band size is determined from the set of sub-band sizes according to the UE-specific sub-band size configuration index.
  • the subband size set is a cell specific subband size set.
  • the method further includes:
  • the CSI includes a channel quality indicator CQI and a precoding matrix indicator PMI, and the subband size used by the PMI
  • the subband size used by the CQI is N times the size of the subband used by the CQI, where the subband size used by the CQI is a subband size determined by the subband size configuration index, and the N is a positive integer.
  • the present invention provides a user equipment, including: a receiving unit, a determining unit, a calculating unit, and a sending unit, where:
  • the receiving unit is configured to receive subband size configuration information sent by the base station, where the subband size configuration information includes a UE-specific subband size configuration index.
  • the determining unit is configured to determine a sub-band size according to the UE-specific sub-band size configuration index; the calculating unit is configured to determine a CSI, where the CSI reflects a transmission on at least one sub-band, the sub- The band is determined according to the size of the sub-band;
  • the sending unit is configured to send the CSI to the base station.
  • the determining unit is specifically configured to determine, according to the UE-specific sub-band size configuration index, a sub-band size from the sub-band size set.
  • the subband size set is a cell-specific subband size set.
  • the receiving unit is further configured to receive a cell-specific sub-band size configuration sent by the base station Lead
  • the determining unit is further configured to determine the cell-specific sub-band size set according to the cell-specific sub-band size configuration index information.
  • the CSI includes a channel quality indicator CQI and a precoding matrix indicator PMI, and the subband used by the PMI
  • the size is N times the size of the subband used by the CQI, where the subband size used by the CQI is the subband size determined by the subband size configuration index, and the N is a positive integer.
  • the present invention provides a base station, including: a sending unit and a receiving unit, where: the sending unit is configured to send subband size configuration information to the UE, where the subband size configuration information includes a UE specific subband size configuration.
  • the receiving unit is configured to receive a CSI sent by the UE, where the CSI reflects a transmission on at least one subband, the subband is determined according to a subband size, and the subband size is determined according to the UE.
  • the specific subband size configuration index is determined.
  • the device further includes:
  • a determining unit configured to determine an index according to the UE-specific sub-band size, and determine the sub-band size from the sub-band size set.
  • the subband size set is a cell specific subband size set.
  • the sending unit is further configured to send a cell-specific sub-band size configuration index to the UE, where The cell-specific subband size set is determined according to the cell specific subband size configuration index.
  • the CSI includes a channel quality indicator CQI and a precoding matrix indicator PMI, and the subband used by the PMI
  • the size is N times the size of the subband used by the CQI, where the subband size used by the CQI is the subband size determined by the subband size configuration index, and the N is a positive integer.
  • the present invention provides a user equipment, including: a receiver and a transmitter, and a processor respectively connected to the receiver and the transmitter, wherein:
  • the receiver is configured to receive subband size configuration information that is sent by the base station, where the subband size configuration information includes a UE-specific subband size configuration index.
  • the processor is configured to determine a subband size according to the UE-specific subband size configuration index; the processor is further configured to determine a CSI, where the CSI reflects a transmission on at least one subband, the sub The band is determined according to the size of the sub-band;
  • the transmitter is configured to send the CSI to the base station.
  • the processor is configured to determine, according to the UE-specific sub-band size configuration index, a sub-band size from the sub-band size set.
  • the subband size set is a cell specific subband size set.
  • the receiver is further configured to receive a cell-specific sub-band size configuration index sent by the base station, where The cell-specific sub-band size set is determined according to the cell-specific sub-band size configuration index.
  • the CSI includes a channel quality indicator CQI and a precoding matrix indicator PMI, and the subband used by the PMI
  • the size is N times the size of the subband used by the CQI, where the subband size used by the CQI is the subband size determined by the subband size configuration index, and the N is a positive integer.
  • the present invention provides a base station, including: a transmitter and a receiver, where: the transmitter is configured to send subband size configuration information to a UE, where the subband size configuration information includes a UE specific subband Size configuration index;
  • the receiver is configured to receive CSI sent by the UE, where the CSI reflects a transmission on at least one subband, the subband is determined according to a subband size, and the subband size is according to the The UE-specific subband size configuration index is determined.
  • the base station further includes:
  • a processor configured to determine an index according to the UE-specific subband size, and determine the subband size from the subband size set.
  • the subband size set is a cell specific subband size set.
  • the transmitter is further configured to send a cell-specific sub-band size configuration index to the UE, where The cell-specific sub-band size set is determined according to the cell-specific sub-band size configuration index.
  • the CSI includes a channel quality indicator CQI and a precoding matrix indicator PMI, and the subband used by the PMI The size is N times the size of the subband used by the CQI, where the subband size used by the CQI is the subband size determined by the subband size configuration index, and the N is a positive integer.
  • the sub-band size configuration information sent by the base station is received, where the sub-band size configuration information includes a UE-specific sub-band size configuration index; determining a sub-band size according to the UE-specific sub-band size configuration index; determining CSI
  • the CSI reflects a transmission on at least one subband, the subband is determined according to the subband size; and the CSI is sent to the base station.
  • the size of the subband of the CSI reflected by the CSI is the UE-specific subband size specified by the base station, so that the subband size can better adapt to the environment of the UE, thereby improving the performance of the communication system.
  • FIG. 1 is a schematic flowchart of a CSI reporting method according to an embodiment of the present invention
  • FIG. 2 is a schematic flowchart of another CSI reporting method according to an embodiment of the present invention
  • FIG. 3 is a schematic structural diagram of a user equipment according to an embodiment of the present invention
  • FIG. 4 is a schematic structural diagram of another base station according to an embodiment of the present invention.
  • FIG. 5 is a schematic structural diagram of a user equipment according to an embodiment of the present disclosure.
  • FIG. 6 is a schematic structural diagram of another base station according to an embodiment of the present invention. detailed description
  • GSM Global System of Mobile communication
  • CDMA Code Division Multiple Access
  • WCDMA Wideband Code Division Multiple Access Wireless
  • GPRS General Packet Radio Service
  • LTE Long Term Evolution
  • the UE may also be referred to as a mobile terminal (Mobile Terminal), a mobile UE, or the like, and may communicate with one or more core networks via a radio access network (RAN).
  • a mobile terminal or mobile station such as a mobile phone (or "cellular" phone) and a computer with a mobile terminal, for example, can be portable, pocket, handheld, computer built-in or car-mounted Mobile devices; UEs may also be relays; they exchange language and/or data with the radio access network.
  • the base station may be a base station (BTS, Base Transceiver Station) in GSM or CDMA, or may be a base station (NodeB) in WCDMA, or may be an evolved Node B in LTE (eNB or The evolved Node B, the e-NodeB, or the relay is not limited in this embodiment of the present invention.
  • BTS Base Transceiver Station
  • NodeB base station
  • eNB evolved Node B in LTE
  • FIG. 1 is a schematic flowchart of a method for reporting a CSI according to an embodiment of the present disclosure. The method may be applied to a UE, as shown in FIG. 1 , including:
  • the UE may be received by UE-specific (UE specific) signaling, such as dedicated Radio Resource Control (RRC) signaling, or Downlink Control Information (DCI).
  • RRC Radio Resource Control
  • DCI Downlink Control Information
  • mapping relationship between the index and the subband size may be configured according to the specific subband size of the UE to obtain the subband size.
  • the resulting subband size is the UE specific subband size.
  • the system bandwidth may be divided into multiple subbands.
  • One or more sub-bands reflected by the CSI may be determined according to the sub-band division.
  • this sub-banding Points are also UE specific. Different UEs may have different subband sizes.
  • the CSI may include a Channel Quality Indicator/Index (CQI) or a Precoding Matrix Indicator (PMI) or a Rank Indicator (RI).
  • CQI Channel Quality Indicator/Index
  • PMI Precoding Matrix Indicator
  • RI Rank Indicator
  • the CSI may be sent to the base station by using a physical uplink control channel (Physical Uplink Contol Channel, or PUCCH) or a physical uplink shared channel (PUSCH).
  • a physical uplink control channel Physical Uplink Contol Channel, or PUCCH
  • PUSCH physical uplink shared channel
  • the channel propagation between the UE and the base station has different delay extensions, and thus has different related bandwidths, and the related bandwidth is often inversely proportional to the delay extension.
  • UEs in urban micro cells tend to be larger than urban macro cells.
  • the UE of (Urban Macro cell, UMa) has a larger delay spread and thus has a smaller correlation bandwidth; further, even if the location of the UE is different in the same cell, especially the distance between the UE and the base station or the height of the UE Differently, the propagation between the UE and the base station will also have different delay spreads.
  • the base station may determine a UE-specific (UE specific) sub-band size configuration for the UE.
  • a UE-specific (UE specific) sub-band size determined according to a coherent bandwidth of a channel between the UE and the base station, such as determining a sub-band size similarity between a coherent bandwidth of a channel between the UE and the base station greater than a preset threshold Subband size for UE specific (UE specific).
  • the preset threshold may be pre-negotiated by the base station and the UE, or may be set by the user, for example: 90%, 95% or 100%. Thereby, it is ensured that the target sub-band size is similar or even equal to the above-mentioned coherent bandwidth.
  • the above-mentioned coherent bandwidth may vary depending on the location of the casual user.
  • the UE-specific sub-band size may also be changed depending on the location of the user.
  • the base station may measure the uplink physical signal of the UE, for example, the sounding reference signal.
  • the base station can also measure the uplink physical channel of the UE. For example, Physical Uplink Contronl CHannel (PUCCH for short) or Physical Uplink Shared Channel (Physical Uplink Shared) CHannel, abbreviated as PUSCH), determines the subband size for the UE. Since the channels between different UEs and base stations are UE-specific, the sub-band sizes obtained based on the above channel measurements are also UE-specific.
  • PUCCH Physical Uplink Contronl CHannel
  • PUSCH Physical Uplink Shared Channel
  • the base station may notify the UE to use the UE-specific sub-band size by sending a UE-specific sub-band size configuration index to the UE, where the UE uses a UE-specific sub-band size and the UE.
  • the specific sub-band size configuration index is corresponding.
  • the UE determines a subband size based on the received UE-specific subband size configuration index by receiving the UE-specific subband size configuration index sent by the base station.
  • the UE-specific sub-band size configuration index may be used to indicate an element in a predefined sub-band size set, where each element is one sub-band size.
  • the UE-specific sub-band size is a function of the UE-specific sub-band size configuration index, and the function may be predefined.
  • the predefined set of subband sizes or the predefined functions are known to both the UE and the base station.
  • the UE may determine the UE-specific sub-band size based on the received UE-specific sub-band size configuration information based on the predefined sub-band size set or function.
  • the subband size in this embodiment is obtained according to the UE specific (UE specific) subband size configuration index, so that the UE can calculate and feed back CSI based on the UE specific subband size.
  • the large band size of the sub-band reflected by the CSI is the UE-specific sub-band size specified by the base station, so that the sub-band size can better adapt to the environment of the UE, thereby improving the performance of the communication system.
  • the UE-specific sub-band size configuration enables the user to adapt to different propagation environments according to system configuration, in particular, changes in the coherence bandwidth of the channel between the adaptive UE and the base station.
  • the sub-band size of the CSI is a UE-specific sub-band size, the accuracy of the CSI feedback can be improved, thereby improving system performance.
  • the UE may further report the subband size indication to the base station.
  • the base station may determine the UE-specific sub-band size configuration index according to the sub-band size indication reported by the UE.
  • the subband size indication may be the same as the UE specific subband size configuration index configured by the base station.
  • the UE may also obtain the UE and the base station by measuring a downlink reference signal, such as a cell-specific reference signal (CRS) or a channel state information reference signal (CSI-RS). Delay spread or coherent bandwidth between channels, and select a subband size based on delay spread or coherence bandwidth, where The sub-band size indication corresponds to the selected one sub-band size.
  • CRS cell-specific reference signal
  • CSI-RS channel state information reference signal
  • determining, according to the UE-specific subband size configuration index, a subband size including
  • An sub-band size is determined from the set of sub-band sizes according to the UE-specific sub-band size configuration index.
  • the set of subband sizes may include multiple identical or different subband sizes.
  • the subband size configuration index is used to indicate one subband size in the subband size set.
  • Each sub-band size in the sub-band size set has a sub-band size configuration index corresponding thereto.
  • the set of subband sizes may contain values of the same size of multiple subbands.
  • the mapping or correspondence between the subband size set or subband size configuration index and each subband size in the subband size set may be predefined, which is known to the UE and the base station.
  • the subband sizes corresponding to different subband size configuration indexes may be as shown in Table 1.
  • the SCI UE indicates a subband size configuration index
  • the B indicates a unit of a subband size.
  • B may be one or more physical resource blocks (PRBs)
  • K indicates a subband size in units of ⁇ .
  • PRBs physical resource blocks
  • K indicates a subband size in units of ⁇ .
  • the UE may obtain the sub-band size from the sub-band size set of the foregoing table according to the received UE-specific sub-band size configuration index, for example, the UE-specific sub-band size configuration index SCIUE is 0, 1, 2, and 3.
  • the sub-band sizes K can be obtained as B, 2B, 3B and 4B, respectively, where B can be 1.
  • the sub-band size can also be a function of a predefined sub-band size configuration index.
  • the subband size set may be a cell specific subband size set.
  • step 102 may specifically include:
  • the UE-specific sub-band size configuration index from the cell-specific sub-band size set Set a subband size.
  • the cell-specific sub-band size set is indicated by a cell-specific sub-band size configuration index notified by the base station.
  • the method may further include:
  • the cell-specific sub-band size set can be determined according to the cell-specific sub-band size configuration index.
  • the cell-specific subband size set corresponding to the cell-specific subband size configuration index may be as shown in Table 2.
  • the SCI CELL indicates a cell-specific sub-band size set configuration index
  • the SCI UE indicates a UE-specific sub-band size configuration index
  • indicates a corresponding sub-band size
  • is a sub-band size unit
  • may be one or more PRB.
  • the SCI CELL is 1 (that is, the cell-specific sub-band size set configuration index is 1)
  • the sub-band size included in the cell-specific sub-band size set corresponding to it is ⁇ B, 4 B , 6 B 8 B ⁇
  • the SCI UE is 1 (ie, the UE-specific sub-band size configuration index is 1), it is 4B.
  • the cell-specific sub-band size configuration index may also be a cell type or obtained according to a cell identifier (cell lD).
  • the band size set configuration information in step 101 in the method may further include a cell-specific sub-band size configuration index; and the cell-specific sub-band size set in step 102 is performed according to the cell-specific sub-band The size configuration index is determined.
  • step 102 may specifically include:
  • the determined sub-band size is a sub-band size of the cell-specific sub-band size configuration index and the UE-specific sub-band size configuration index.
  • the cell-specific sub-band size set is determined according to the cell-specific sub-band size configuration index, and then one sub-band size is determined from the cell-specific sub-band size set according to the UE-specific sub-band size configuration index. It is also possible to determine a subband size from the set of subband sizes together with the UE-specific subband size configuration index and the UE-specific subband size configuration index. As shown in Table 2, when the cell-specific sub-band size configuration index is 1 and the UE-specific sub-band size configuration index is 1, the sub-band size of the sub-band size of 4B can be directly determined.
  • the method further includes determining, according to the UE-specific sub-band size configuration index, a plurality of sub-band sizes (belonging to different cell-specific sub-band size sets), and determining a sub-band size according to the cell-specific sub-band size configuration index. That is, the sub-band size determined according to the UE-specific sub-band size configuration index included in the cell-specific sub-band size set is obtained.
  • the sub-band size 2B, 4B may be determined according to the UE-specific sub-band size configuration index 1 2B and 4B, and determining the sub-band size set 1 according to the cell-specific sub-band size configuration index 1, thereby determining the sub-band size 4B included in the sub-band size set 1.
  • the UE obtains the sub-band size from the cell-specific sub-band size set according to the UE-specific (UE specific) sub-band size configuration index, so that the UE can be based on different cell environments (eg, macro cell and micro cell). Different wireless propagation characteristics), the UE-specific sub-band size is obtained, and CSI is calculated and fed back.
  • the UE-specific sub-band size configuration enables the user to adapt wireless propagation characteristics in different propagation environments, in particular different cell environments, according to system configuration, in particular, the coherent bandwidth of the channel between the adaptive UE and the base station ( Changes in coherence bandwidth) improve the accuracy of CSI feedback, thereby improving system performance.
  • the CSI in the step 103 may include a channel quality indicator CQI and a precoding matrix indicator PMI or a rank indicator RI.
  • the sub-band size corresponding to the PMI or the rank indication RI may be an integer multiple of the sub-band size corresponding to the channel quality indicator CQI.
  • the precoding matrix indicates the PMI
  • the subband size should be understood as the subband size used by the PMI.
  • the subband size corresponding to the RI can be understood as the subband size used by the RI.
  • the subband size corresponding to the CQI can be understood as the subband size used by the CQI.
  • the subband size used by the CQI is a subband size determined by the subband size configuration index.
  • the precoding matrix indicates that the subband size corresponding to the PMI or the rank indication RI may be N times the subband size corresponding to the channel quality indicator CQI, and N is an integer greater than or equal to 1.
  • the specific value of N may be determined according to a transmission mode of the UE or a CSI reporting mode.
  • CQI has stronger frequency selectivity than PMI or RI because channel quality indication CQI is usually used for scheduling and user pairing.
  • the sub-band size corresponding to the CQI is 1/N of the sub-band size corresponding to the PMI or the rank indication RI, which is more advantageous for frequency selective scheduling, thereby improving the throughput provided.
  • the UE obtains the subband size from the cell-specific subband size set according to the UE-specific (UE specific) subband size configuration index, and the precoding matrix indicates that the subband size corresponding to the PMI or the rank indication RI is
  • the channel quality indicates an integer multiple of the subband size corresponding to the CQI. Therefore, the UE-specific sub-band size configuration enables the user to adapt different frequency selectivity according to the system configuration, in particular, the coherence bandwidth of the channel between the adaptive UE and the base station, and improve the CSI feedback. Accuracy, which improves system performance.
  • FIG. 2 is a schematic flowchart of another CSI reporting method according to an embodiment of the present invention. The method may be applied to a base station, as shown in FIG. 2, including:
  • the UE send subband size configuration information to the UE, where the subband size configuration information includes a UE specific subband size configuration index.
  • the base station may send the sub-band size configuration information to the UE by using UE-specific (UE specific) signaling, such as dedicated radio resource control RRC signaling, or downlink control information DCI.
  • UE-specific UE specific
  • RRC dedicated radio resource control
  • DCI downlink control information
  • the UE may determine the sub-band size according to the UE-specific sub-band size configuration index; and calculate CSI, where the CSI reflects the transmission on the at least one sub-band.
  • the sub-band is determined according to the sub-band size; the CSI sent to the base station.
  • the subband is determined according to the subband size, and the subband size is determined according to the UE specific subband size configuration index.
  • the CSI sent by the UE may be received by using a physical uplink control channel (Physical Uplink Contol Channel, or PUCCH) or a Physical Uplink Shared Channel (PUSCH).
  • a physical uplink control channel Physical Uplink Contol Channel, or PUCCH
  • PUSCH Physical Uplink Shared Channel
  • the CSI reflects transmission on at least one subband.
  • the base station may determine an sub-band size used by the UE according to the UE-specific sub-band size configuration index that is sent by the base station, and divide the system bandwidth into multiple sub-bands according to the sub-band size, thereby determining the received The size of one or more sub-bands reflected by the CSI and their corresponding locations. Thereby facilitating scheduling of CSI information users on the at least one sub-band.
  • this subband partitioning is also UE specific. Different UEs may have different subband sizes.
  • the channel propagation between the UE and the base station has different delay extensions, and thus has different related bandwidths, and the related bandwidth is often inversely proportional to the delay extension.
  • UEs in urban micro cells tend to be larger than urban macro cells.
  • the UE of (Urban Macro cell, UMa) has a larger delay spread and thus has a smaller correlation bandwidth; further, even if the location of the UE is different in the same cell, especially the distance between the UE and the base station or the height of the UE Differently, the propagation between the UE and the base station will also have different delay spreads.
  • the base station may determine a UE-specific (UE specific) sub-band size configuration for the UE.
  • a UE-specific (UE specific) sub-band size determined according to a coherent bandwidth of a channel between the UE and the base station, such as determining a sub-band size similarity between a coherent bandwidth of a channel between the UE and the base station greater than a preset threshold Subband size for UE specific (UE specific).
  • the preset threshold may be pre-negotiated by the base station and the UE, or may be set by the user, for example: 90%, 95% or 100%. Thereby, it is ensured that the target sub-band size is similar or even equal to the above-mentioned coherent bandwidth.
  • the above-mentioned coherent bandwidth may vary depending on the location of the casual user.
  • the UE-specific sub-band size may also be changed depending on the location of the user.
  • the base station may measure the uplink physical signal of the UE, for example, the sounding reference signal.
  • SRS Sounding Referene Signal
  • DMRS Demodulation Reference Signal
  • the base station can also measure the uplink physical channel of the UE, such as a physical uplink control channel (Physical Uplink Contronl CHannel), or a physical uplink shared channel (Physical Uplink Contronl CHannel).
  • Uplink Shared CHannel (PUSCH for short) determines the subband size for the UE. Since the channels between different UEs and base stations are UE-specific, the sub-band sizes obtained based on the above channel measurements are also UE-specific.
  • the base station may notify the UE to use the UE-specific sub-band size by sending a UE-specific sub-band size configuration index to the UE, where the UE uses a UE-specific sub-band size and the UE.
  • the specific sub-band size configuration index is corresponding.
  • the foregoing method may be specifically applied to a base station, that is, the base station may implement the foregoing method.
  • the base station sends a UE-specific sub-band size configuration index to the UE, so that the UE can calculate and feed back CSI based on the sub-band size corresponding to the UE-specific sub-band size configuration index.
  • the size of the subband of the CSI reflected by the CSI is the UE-specific subband size specified by the base station, so that the subband size can better adapt to the environment of the UE, thereby improving the performance of the communication system.
  • the large band size of the sub-bands that can be implemented by the CSI is specified by the base station, so that the base station can enable the user to adapt different propagation environments according to the system configuration, in particular, the coherence of the channel between the adaptive UE and the base station. The change in bandwidth (coherence bandwidth).
  • the sub-band size of the CSI is a UE-specific sub-band size, the accuracy of the CSI feedback can be improved, thereby improving system performance.
  • the base station may further receive the subband size indication reported by the UE.
  • the base station may determine the UE-specific sub-band size configuration index according to the sub-band size indication reported by the UE.
  • the subband size indication may be the same as the UE specific subband size configuration index configured by the base station.
  • the UE may also obtain a delay spread or a coherent bandwidth of the channel between the UE and the base station by measuring a downlink reference signal, such as a cell-specific reference signal CRS or a channel state information reference signal CSI-RS, and based on delay extension. Or the coherent bandwidth selects a subband size, wherein the subband size indication corresponds to the selected one subband size.
  • the method may include:
  • the sub-band size is determined from the set of sub-band sizes according to the UE-specific sub-band size configuration index.
  • the sub-band size is notified to the UE by the base station, and the base station determines the sub-band used by the CSI reported by the UE according to the information notified to the UE, that is, the base station default UE performs according to the notification of the base station.
  • the set of subband sizes may include multiple identical or different subband sizes.
  • the subband size configuration index is used to indicate one subband size in the subband size set.
  • Each sub-band size in the sub-band size set has a sub-band size configuration index corresponding thereto.
  • the set of subband sizes may contain values of the same size of multiple subbands.
  • the mapping or correspondence between the subband size set or the subband size configuration index and each subband size in the subband size set may be predefined, which is known to the UE and the base station.
  • the subband sizes corresponding to different subband size configuration indexes may be as shown in Table 1.
  • the subband size is obtained in the subband size set of the above table.
  • the subband sizes K can be obtained as B, 2B, 3B, and 4B, respectively.
  • B can be 1.
  • the subband size may also be a function of a predefined subband size configuration index.
  • the subband size set may be a cell specific subband size set.
  • the method may further include:
  • the cell-specific sub-band size set is indicated by a cell-specific sub-band size configuration index notified by the base station.
  • the cell-specific subband size set corresponding to the cell-specific subband size configuration index may be as shown in Table 2.
  • the cell-specific sub-band size configuration index may also be a cell type or obtained according to a cell identifier (cell lD).
  • the band size set configuration information in step 201 in the method may further include a cell-specific sub-band size configuration index; the cell-specific sub-band size set is configured according to the cell-specific sub-band size. The index is determined.
  • the sub-band size may also be determined according to the UE-specific sub-band size configuration index, which is determined from a cell-specific sub-band size set, where the cell-specific sub- The band set is determined according to the cell-specific sub-band size configuration index.
  • the sub-band size may be determined according to the cell-specific sub-band size configuration index and the UE-specific sub-band size configuration index, from the sub-band size set.
  • the cell-specific sub-band size set may be determined according to the cell-specific sub-band size configuration index, and then one sub-band size is determined from the cell-specific sub-band size set according to the UE-specific sub-band size configuration index. It is also possible to determine a sub-band size from the set of sub-band sizes together with the cell-specific sub-band size configuration index and the UE-specific sub-band size configuration index. As shown in Table 2, when the cell-specific sub-band size configuration index is 2 and the UE-specific sub-band size configuration index is 3, the sub-band size of the sub-band size of 8B can be directly determined.
  • the method further includes determining, according to the UE-specific sub-band size configuration index, a plurality of sub-band sizes (belonging to different cell-specific sub-band size sets), and determining a sub-band size according to the cell-specific sub-band size configuration index. That is, the subband size determined according to the UE-specific subband size configuration index included in the cell-specific subband size set is obtained.
  • the sub-band size 2B, 4B may be determined according to the UE-specific sub-band size configuration index 1 2B and 4B, and determining the subband size set 0 according to the cell-specific subband size configuration index 0, thereby determining the subband size 2B included in the subband size set 0.
  • the base station uses the cell-specific sub-band size configuration index and the UE-specific (UE specific) sub-band size configuration index, and configures the sub-band size used by the UECSI feedback to be obtained from the cell-specific sub-band size set.
  • the UE can obtain the UE-specific sub-band size based on different cell environments (for example, different radio propagation characteristics in the macro cell and the micro cell), calculate and feed back CSI.
  • the UE-specific sub-band size configuration enables the user to adapt wireless propagation characteristics in different propagation environments, in particular different cell environments, according to system configuration, in particular, coherent bandwidth of the channel between the adaptive UE and the base station. Changes in (coherence bandwidth) improve the accuracy of CSI feedback, thereby improving system performance.
  • the CSI in the step 202 may include a channel quality indicator CQI and a precoding matrix indicator PMI or a rank indicator RI.
  • the sub-band size corresponding to the PMI or the rank indication RI may be N times the sub-band size corresponding to the channel quality indicator CQI.
  • the precoding matrix indicates that the subband size corresponding to the PMI can be understood as the subband size used by the PMI, and the subband size corresponding to the RI can be understood.
  • the subband size used by the RI, the subband size corresponding to the CQI can be understood as the subband size used by the CQI; wherein the subband size used by the CQI is the subband size determined by the subband size configuration index.
  • N is an integer greater than or equal to 1. The specific value of N may be determined according to the transmission mode of the UE or the CSI reporting mode.
  • channel quality indication CQI is typically used for scheduling and user pairing, CQI has greater frequency selectivity than PMI or RI.
  • the sub-band size corresponding to the CQI is 1/N of the sub-band size corresponding to the PMI or the rank indication RI, which is more advantageous for frequency selective scheduling, thereby improving the provided throughput.
  • the base station configures the UE-specific (UE specific) sub-band size configuration index, and configures the UECSI feedback to use the UE-specific sub-band size, so that the UE can obtain the UE-specific based on different radio propagation characteristics.
  • the subband size calculate and feed back CSI.
  • the precoding matrix indicates that the subband size corresponding to the PMI or the rank indication RI is an integer multiple of the subband size corresponding to the channel quality indicator CQI. Therefore, the UE-specific sub-band size configuration enables the user to adapt different frequency selectivity according to the system configuration, in particular, the coherence bandwidth of the channel between the adaptive UE and the base station, and improve the CSI feedback. Accuracy, thereby improving systemicity h
  • FIG. 3 is a schematic structural diagram of a user equipment according to an embodiment of the present invention. As shown in FIG. 3, the method includes: a receiving unit 31, a determining unit 32, a calculating unit 33, and a sending unit 34, where:
  • the receiving unit 31 is configured to receive subband size configuration information sent by the base station, where the subband size configuration information includes a UE-specific subband size configuration index.
  • the subband size configuration information may be received by using UE-specific signaling, such as dedicated radio resource control RRC signaling, or downlink control information DCI.
  • UE-specific signaling such as dedicated radio resource control RRC signaling, or downlink control information DCI.
  • the determining unit 32 is configured to determine a sub-band size according to the UE-specific sub-band size configuration index.
  • the determining unit 32 may configure an index and a subband size according to the UE-specific subband size. The mapping relationship between the two gets the subband size.
  • the calculating unit 33 is configured to determine CSI, wherein the CSI reflects a transmission on at least one subband, and the subband is determined according to the subband size.
  • the system bandwidth may be divided into multiple subbands.
  • One or more sub-bands reflected by the CSI may be determined according to the sub-band division.
  • this subband division is also UE specific. Different UEs may have different subband sizes.
  • the CSI may include a channel quality indicator CQI or a precoding matrix indicator PMI or a rank indicator RI.
  • the sending unit 34 is configured to send the CSI to the base station.
  • the subband size in this embodiment is obtained according to the UE specific (UE specific) subband size configuration index, so that the UE can calculate and feed back CSI based on the UE specific subband size.
  • the large band size of the sub-band reflected by the CSI is the UE-specific sub-band size specified by the base station, so that the sub-band size can better adapt to the environment of the UE, thereby improving the performance of the communication system.
  • the UE-specific sub-band size configuration enables the user to adapt to different propagation environments according to system configuration, in particular, changes in the coherence bandwidth of the channel between the adaptive UE and the base station.
  • the sub-band size of the CSI is a UE-specific sub-band size, the accuracy of the CSI feedback can be improved, thereby improving system performance.
  • the sending unit 34 may be further configured to report a subband size indication to the base station.
  • the base station may determine a UE-specific sub-band size configuration index according to the sub-band size indication reported by the UE.
  • the subband size indication may be the same as the UE specific subband size configuration index configured by the base station.
  • the UE may further obtain a delay spread or a coherent bandwidth of the channel between the UE and the base station by measuring a downlink reference signal, such as a cell-specific reference signal CRS or a channel state information reference signal CSI-RS, and is based on the delay.
  • the extended or coherent bandwidth selects a subband size, wherein the subband size indication corresponds to the selected one of the subband sizes.
  • the subband size configuration index determines a subband size from the subband size set.
  • the set of subband sizes may include multiple identical or different subband sizes.
  • the subband size configuration index is used to indicate one subband size in the subband size set.
  • Each of the subband size sets has a subband size configuration index corresponding thereto. Need to enter It is pointed out in one step that the sub-band size set may contain values of the same size of multiple sub-bands.
  • the mapping or correspondence between the subband size set or the subband size configuration index and each subband size in the subband size set may be predefined, which is well known to the UE and the base station.
  • the subband sizes corresponding to different subband size configuration indexes may be as shown in Table 1.
  • the subband size set may be a cell specific subband size set.
  • the subband size configuration index determines a subband size from a cell-specific subband size set.
  • the receiving unit 31 is further configured to receive a cell-specific sub-band size configuration index sent by the base station;
  • the determining unit 32 may be configured to determine the cell-specific sub-band size set according to the cell-specific sub-band size configuration index.
  • the cell-specific sub-band size set is indicated by a cell-specific sub-band size configuration index notified by the base station.
  • the cell-specific subband size set corresponding to the cell-specific subband size configuration index may be as shown in Table 2.
  • the cell-specific sub-band size configuration index may also be a cell type or obtained according to a cell identifier (cell lD).
  • the sub-band size configuration information received by the receiving unit 31 may further include a cell-specific sub-band size configuration index; that is, the receiving unit 31 may be further configured to receive a cell-specific sub-band size configuration index sent by the base station.
  • the cell-specific sub-band size set used by the determining unit 32 is determined according to the cell-specific sub-band size configuration index, that is, the determining unit 32 is further configured to determine, according to the cell-specific sub-band size configuration index information.
  • the cell-specific subband size set is determined according to the cell-specific sub-band size configuration index, that is, the determining unit 32 is further configured to determine, according to the cell-specific sub-band size configuration index information.
  • the determining unit 32 may be configured to configure an index according to the cell-specific sub-band size set and the UE-specific sub-band size configuration index, from the sub-band size set. Determine a subband size.
  • the determined sub-band size is a sub-band size of the cell-specific sub-band size configuration index and the UE-specific sub-band size configuration index.
  • the cell-specific sub-band size set is determined according to the cell-specific sub-band size configuration index, and then one sub-band size is determined from the cell-specific sub-band size set according to the UE-specific sub-band size configuration index.
  • Can also be according to the A cell-specific subband size configuration index and the UE-specific subband size configuration index together determine a subband size from the subband size set. As shown in Table 2, when the cell-specific sub-band size configuration index is 1 and the UE-specific sub-band size configuration index is 1, the sub-band size of the sub-band size of 4B can be directly determined.
  • the method further includes determining, according to the UE-specific sub-band size configuration index, a plurality of sub-band sizes (belonging to different cell-specific sub-band size sets), and determining a sub-band size according to the cell-specific sub-band size configuration index. That is, the sub-band size determined according to the UE-specific sub-band size configuration index included in the cell-specific sub-band size set is obtained.
  • the sub-band size 2B, 4B may be determined according to the UE-specific sub-band size configuration index 1 2B and 4B, and determining the sub-band size set 1 according to the cell-specific sub-band size configuration index 1, thereby determining the sub-band size 4B included in the sub-band size set 1.
  • the user equipment obtains a sub-band size from a cell-specific sub-band size set according to a UE-specific (UE specific) sub-band size configuration index, so that the UE can be based on different cell environments (eg, a macro cell and Different radio propagation characteristics in the micro cell), the UE-specific sub-band size is obtained, and CSI is calculated and fed back.
  • the UE-specific sub-band size configuration enables the user to adapt wireless propagation characteristics in different propagation environments, in particular different cell environments, according to the system configuration, in particular the coherent bandwidth of the channel between the adaptive UE and the base station ( Changes in coherence bandwidth) improve the accuracy of CSI feedback, thereby improving system performance.
  • the sending unit 34 is configured to send the CSI to the base station, where the CSI may include a channel quality indicator CQI and a precoding matrix indicator PMI or a rank indicator RI.
  • the sub-band size corresponding to the PMI or the rank indication RI may be N times the sub-band size corresponding to the channel quality indicator CQI.
  • the precoding matrix indicates that the subband size corresponding to the PMI can be understood as the subband size used by the PMI, and the subband size corresponding to the RI can be understood as the subband size used by the RI.
  • the subband size corresponding to the CQI can be understood as The subband size used by the CQI; wherein the subband size used by the CQI is the subband size determined by the subband size configuration index.
  • N is a positive integer. The specific value of N can be determined according to the transmission mode of the UE or the CSI reporting mode.
  • CQI is usually used for scheduling and user pairing
  • CQI is better than PMI or RI.
  • the sub-band size corresponding to the CQI is 1/N of the sub-band size corresponding to the PMI or the rank indication RI of the precoding matrix, which is more advantageous for implementing frequency selective scheduling, thereby improving the provided throughput.
  • the user equipment obtains a subband size from a cell-specific subband size set according to a UE-specific (UE specific) subband size configuration index, and the precoding matrix indicates a subband corresponding to a PMI or a rank indication RI.
  • the size is an integer multiple of the subband size corresponding to the channel quality indication CQI. Therefore, the UE-specific sub-band size configuration enables the user to adapt different frequency selectivity according to the system configuration, in particular, the coherence bandwidth of the channel between the adaptive UE and the base station, and improve the CSI feedback. Accuracy, which improves system performance.
  • FIG. 4 is a schematic structural diagram of a base station according to an embodiment of the present invention. As shown in FIG. 4, the method includes: a sending unit 41 and a receiving unit 42, where:
  • the sending unit 41 is configured to send subband size configuration information to the UE, where the subband size configuration information includes a UE-specific subband size configuration index.
  • the subband size configuration information may be sent to the UE by UE specific (UE specific) signaling, such as dedicated radio resource control RRC signaling, or downlink control information DCI.
  • UE specific UE specific signaling, such as dedicated radio resource control RRC signaling, or downlink control information DCI.
  • the UE may determine the sub-band size according to the UE-specific sub-band size configuration index; and calculate CSI, where the CSI reflects the transmission on the at least one sub-band.
  • the sub-band is determined according to the sub-band size; and the CSI is sent to the base station.
  • the receiving unit 42 is configured to receive CSI sent by the UE, where the CSI reflects a transmission on at least one subband, the subband is determined according to a subband size, and the subband size is determined according to the UE.
  • the subband size configuration index is determined.
  • the CSI sent by the UE may be received by using a physical uplink control channel PUCCH or a physical uplink shared channel PUSCH.
  • the channel propagation between the UE and the base station has different delay spreads, and thus has different related bandwidths, and the related bandwidth is often inversely proportional to the delay spread.
  • UMi Urban Micro cell
  • UMa Urban Macro Cell
  • the propagation between the UE and the base station will have different delay spread.
  • the base station can determine a UE-specific (UE specific) sub-band size configuration for the UE. For example, a UE-specific (UE specific) sub-band size determined according to a coherent bandwidth of a channel between the UE and the base station, such as determining a sub-band size similarity between a coherent bandwidth of a channel between the UE and the base station greater than a preset threshold.
  • Subband size for UE specific (UE specific). The preset threshold may be pre-negotiated by the base station and the UE, or may be set by the user, for example: 90%, 95% or 100%. Thereby, it is ensured that the target sub-band size is similar or even equal to the above-mentioned coherent bandwidth.
  • the above-mentioned coherent bandwidth may vary according to the location of the casual user. Through the above steps, the UE-specific sub-band size may also be changed according to the location of the user.
  • the base station sends a UE-specific sub-band size configuration index to the UE, so that the UE can calculate and feed back CSI based on the sub-band size corresponding to the UE-specific sub-band size configuration index.
  • the size of the subband of the CSI reflected by the CSI is the UE-specific subband size specified by the base station, so that the subband size can better adapt to the environment of the UE, thereby improving the performance of the communication system.
  • the large band size of the sub-bands that can be implemented by the CSI is specified by the base station, so that the base station can enable the user to adapt different propagation environments according to the system configuration, in particular, the coherence of the channel between the adaptive UE and the base station. The change in bandwidth (coherence bandwidth).
  • the sub-band size of the CSI is a UE-specific sub-band size, the accuracy of the CSI feedback can be improved, thereby improving system performance.
  • the receiving unit 42 is further configured to receive a subband size indication reported by the UE.
  • the UE-specific sub-band size configuration index is determined according to the sub-band size indication reported by the UE.
  • the subband size indication may be the same as the UE specific subband size configuration index configured by the base station.
  • the UE may also obtain a delay spread or a coherent bandwidth of the channel between the UE and the base station by measuring a downlink reference signal, such as a cell-specific reference signal CRS or a channel state information reference signal CSI-RS, and based on delay extension.
  • the coherent bandwidth selects a subband size, wherein the subband size indication corresponds to the selected one subband size.
  • the base station may further include:
  • the determining unit 43 is configured to determine the sub-band size from the sub-band size set according to the UE-specific sub-band size configuration index.
  • the set of subband sizes may include multiple identical or different subband sizes.
  • the subband size configuration index is used to indicate one subband size in the subband size set.
  • Each of the subband size sets has a subband size configuration index corresponding thereto. It should be further noted that the sub-band size set may include values of the same size of multiple sub-bands.
  • the mapping or the correspondence between the subband size set or the subband size configuration index and each subband size in the subband size set may be predefined, for the UE and the base station.
  • the subband sizes corresponding to different subband size configuration indexes can be as shown in Table 1.
  • the subband size is obtained in the size set.
  • the subband size can also be a function of a predefined subband size configuration index.
  • the subband size set may be a cell specific subband size set.
  • the sending unit 41 is further configured to send, to the UE, a cell-specific sub-band size configuration index, where the cell-specific sub-band size set is determined according to the cell-specific sub-band size configuration index.
  • the cell-specific sub-band size set is indicated by a cell-specific sub-band size configuration index notified by the base station.
  • the cell-specific subband size set corresponding to the cell-specific subband size configuration index may be as shown in Table 2.
  • the cell-specific sub-band size configuration index may also be a cell type or obtained according to a cell identifier (cell lD).
  • the band size set configuration information may further include a cell-specific sub-band size configuration index; the cell-specific sub-band size set is determined according to the cell-specific sub-band size configuration index.
  • the sub-band size may also be determined according to the UE-specific sub-band size configuration index, which is determined from a cell-specific sub-band size set, where the cell-specific sub-band set The index determination is configured according to the cell-specific sub-band size.
  • the sub-band size may be determined according to the cell-specific sub-band size configuration index and the UE-specific sub-band size configuration index, from the sub-band size set.
  • the cell-specific sub-band size set may be determined according to the cell-specific sub-band size configuration index, and then one sub-band size is determined from the cell-specific sub-band size set according to the UE-specific sub-band size configuration index.
  • the method further includes determining, according to the UE-specific sub-band size configuration index, a plurality of sub-band sizes (belonging to different cell-specific sub-band size sets), and determining a sub-band size according to the cell-specific sub-band size configuration index.
  • the subband size determined according to the UE-specific subband size configuration index included in the cell-specific subband size set is obtained.
  • the sub-band size 2B, 4B may be determined according to the UE-specific sub-band size configuration index 1 2B and 4B, and determining the subband size set 0 according to the cell-specific subband size configuration index 0, thereby determining the subband size 2B included in the subband size set 0.
  • the base station configures a sub-band size used by the UECSI feedback from a cell-specific sub-band size set by using a cell-specific sub-band size configuration index and a UE-specific (UE specific) sub-band size configuration index. Obtained, so that the UE can obtain the UE-specific sub-band size based on different cell environments (for example, different radio propagation characteristics in the macro cell and the micro cell), calculate and feed back CSI.
  • the UE-specific sub-band size configuration enables the user to adapt wireless propagation characteristics in different propagation environments, in particular different cell environments, according to system configuration, in particular, coherent bandwidth of the channel between the adaptive UE and the base station. Changes in (coherence bandwidth) improve the accuracy of CSI feedback, thereby improving system performance.
  • the CSI received by the receiving unit 42 may include a channel quality indicator CQI and a precoding matrix indicator PMI or a rank indicator RI.
  • the sub-band size corresponding to the PMI or the rank indication RI may be N times the sub-band size corresponding to the channel quality indicator CQI.
  • the precoding matrix indicates that the subband size corresponding to the PMI can be understood as the subband size used by the PMI, and the subband size corresponding to the RI can be understood as the subband size used by the RI.
  • the subband size corresponding to the CQI can be understood as The subband size used by the CQI; wherein the subband size used by the CQI is the subband size determined by the subband size configuration index.
  • N is an integer greater than or equal to 1. The specific value of N can be based on the transmission mode of the UE or CSI. The reporting mode is determined.
  • channel quality indication CQI is typically used for scheduling and user pairing, CQI has greater frequency selectivity than PMI or RI.
  • the sub-band size corresponding to the CQI is 1/N of the sub-band size corresponding to the PMI or the rank indication RI, which is more advantageous for frequency selective scheduling, thereby improving the provided throughput.
  • the base station configures the UE-specific (UE specific) sub-band size configuration index, and configures the UECSI feedback to use the UE-specific sub-band size, so that the UE can obtain the UE-specific based on different radio propagation characteristics.
  • the subband size calculate and feed back CSI.
  • the precoding matrix indicates that the subband size corresponding to the PMI or the rank indication RI is an integer multiple of the subband size corresponding to the channel quality indicator CQI. Therefore, the UE-specific sub-band size configuration enables the user to adapt different frequency selectivity according to the system configuration, in particular, the coherence bandwidth of the channel between the adaptive UE and the base station, and improve the CSI feedback. Accuracy, which improves system performance.
  • FIG. 5 is a schematic structural diagram of a user equipment according to an embodiment of the present invention. As shown in FIG. 5, the method includes: a receiver 51 and a transmitter 52, and a processor 53 connected to the receiver 51 and the transmitter 52, respectively. , among them:
  • the receiver 51 is configured to receive subband size configuration information that is sent by the base station, where the subband size configuration information includes a UE-specific subband size configuration index.
  • the processor 53 is configured to determine a subband size according to the UE specific subband size configuration index
  • the processor 53 is further configured to determine a CSI, where the CSI reflects a transmission on at least one subband, and the subband is determined according to the subband size;
  • the transmitter 52 is configured to send the CSI to the base station.
  • the processor 52 is configured to determine an subband size from the subband size set according to the UE specific subband size configuration index.
  • the subband size set may be a cell specific subband size set.
  • the receiver 51 is further configured to receive a cell-specific sub-band size configuration index sent by the base station, where the cell-specific sub-band size set is configured according to the cell-specific sub-band size. Quoted.
  • the processor 52 can determine the cell-specific sub-band size based on the cell-specific sub-band size configuration index.
  • the CSI may include a channel quality indicator CQI and a precoding matrix indicator PMI, where the PBM uses a subband size that is N times a subband size used by the CQI, where the CQI uses a subband.
  • the size is a subband size determined by the subband size configuration index, and the N is a positive integer.
  • the subband size in this embodiment is obtained according to the UE specific (UE specific) subband size configuration index, so that the UE can calculate and feed back CSI based on the UE specific subband size.
  • the large band size of the sub-band reflected by the CSI is the UE-specific sub-band size specified by the base station, so that the sub-band size can better adapt to the environment of the UE, thereby improving the performance of the communication system.
  • the UE-specific sub-band size configuration enables the user to adapt to different propagation environments according to system configuration, in particular, changes in the coherence bandwidth of the channel between the adaptive UE and the base station.
  • FIG. 6 is a schematic structural diagram of a base station according to an embodiment of the present invention. As shown in FIG. 6, the method includes: a transmitter 61 and a receiver 62, where:
  • a transmitter 61 configured to send subband size configuration information to the UE, where the subband size configuration information includes a UE-specific subband size configuration index;
  • the receiver 62 is configured to receive CSI sent by the UE, where the CSI reflects a transmission on at least one subband, the subband is determined according to a subband size, and the subband size is according to the The UE-specific sub-band size configuration index is determined.
  • the foregoing base station may further include:
  • the processor 63 is configured to determine the subband size from the set of subband sizes according to the UE-specific subband size configuration index.
  • the subband size set may be a cell specific subband size set.
  • the transmitter 62 is further configured to send a cell-specific sub-band size configuration index to the UE, so that the cell-specific sub-band size set is determined according to the cell-specific sub-band size configuration index.
  • the CSI includes a channel quality indicator CQI and a precoding matrix indicator PMI, where the PBM uses a subband size that is N times a subband size used by the CQI, where the CQI uses a subband size.
  • the subband size determined by the index is configured for the subband size, and the N is a positive integer.
  • the base station sends a UE-specific sub-band size configuration index to the UE, so that the UE can calculate and feed back CSI based on the sub-band size corresponding to the UE-specific sub-band size configuration index.
  • the size of the subband of the CSI reflected by the CSI is the UE-specific subband size specified by the base station, so that the subband size can better adapt to the environment of the UE, thereby improving the performance of the communication system.
  • the large band size of the sub-bands that can be implemented by the CSI is specified by the base station, so that the base station can enable the user to adapt different propagation environments according to the system configuration, in particular, the coherence of the channel between the adaptive UE and the base station. The change in bandwidth (coherence bandwidth).
  • the sub-band size of the CSI is a UE-specific sub-band size, the accuracy of the CSI feedback can be improved, thereby improving system performance.
  • the storage medium may be a magnetic disk, an optical disk, a read-only memory (ROM), or a random access memory (RAM).

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Abstract

本发明实施例公开了一种CSI报告方法和设备,该方法可包括:接收基站发送的子带大小配置信息,所述子带大小配置信息包括用户设备特定的子带大小配置索引;根据所述用户设备特定的子带大小配置索引确定子带大小;确定 CSI,其中,所述CSI反映至少一个子带上的传输,所述子带是根据所述子带大小确定的;向所述基站发送所述CSI。本发明实施例可以提高通信系统的性能。

Description

一种 csi报告方法和设备 技术领域
本发明涉及通信领域, 尤其涉及一种信道状态信息 (Channel State Information, CSI ) ·¾告方法和设备。 背景技术
在通信系统中, 信道状态信息 (Channel State Information, 简称 CSI)通常 描述了在特定带宽上传输时的信道条件, 可以用于链路自适应和资源调度,对 获取信道特性从而提高系统的吞吐量至关重要。信道状态信息通常包括信道质 量指示( Channel Quality Indicator, 简称 CQI ), 此外,对于使用预编码的系统, CQI还基于所使用的预编码矩阵计算,所述预编码矩阵通常由一个或者多个索 引指示, 如预编码矩阵指示( Preceding Matrix Indicator, 简称 PMI )和预编码 矩阵的层数或者秩指示 (Rank Indication, 简称 RI )。 所述 CSI通常由用户设 备( User Equipment, UE )反馈给基站( Base station, BS )。 现有 LTE系统按 照不同的频域粒度反馈 CSI信息。整个系统带宽被划分为多个子带, 所述子带 的大小由系统带宽和报告模式确定。
目前通信系统中,主要通过宏蜂窝系统和微蜂窝系统共同覆盖以解决迅速 增长的业务需求。宏蜂窝系统的基站或者发射机的往往位置高于周围建筑物的 高度, 而微蜂窝系统的基站或者发射机的位置往往低于周围建筑物的高度。此 外, 上述系统设计其主要针对与室外 UE的通信, 即所考虑的 UE主要分布在 地面。
在上述两种通信系统中, UE都需要向基站反馈 CSI。 而在实际应用中在 高 UE密度场景中的 UE将主要分布于室内, 例如 2到 8层的楼宇内。 在所述 场景中, UE与基站之间的距离或者 UE所处的高度的不同, 将导致 UE与基 站之间的多径传播会有所不同, 特别是多径的时延扩展会明显不同。 这样当 CSI所描述的子带的子带大小都是由系统带宽和报告模式确定, 这样为 UE配 置确定的子带大小,无法适应上述将导致 UE与基站之间的多径传播会有所不 同,特别是多径的时延扩展会明显不同的情况,从而导致通信系统的性能降低。 发明内容
本发明实施例提供了一种 CSI报告方法和设备, 可以提高通信系统的性 h
fj匕。
第一方面, 本发明实施例提供一种 CSI报告方法, 包括:
接收基站发送的子带大小配置信息, 所述子带大小配置信息包括 UE特定 的子带大小配置索引;
根据所述 UE特定的子带大小配置索引确定子带大小;
确定 CSI, 其中, 所述 CSI反映至少一个子带上的传输, 所述子带是根据 所述子带大小确定的;
向所述基站发送所述 CSI。
在第一方面的第一种可能的实现方式中,所述根据所述 UE特定的子带大 小配置索引确定子带大小, 包括:
根据所述 UE特定的子带大小配置索引,从子带大小集合中确定一个子带 大小。
结合第一方面的第一种可能的实现方式,在第一方面的第二种可能的实现 方式中, 其特征在于, 所述子带大小集合是小区特定的子带大小集合。
结合第一方面的第二种可能的实现方式,在第一方面的第三种可能的实现 方式中, 所述方法还包括:
接收所述基站发送的小区特定的子带大小配置索引,所述小区特定的子带 大小集合根据所述小区特定的子带大小配置索引确定的。
结合第一方面的上述任一种可能的实现方式,在第一方面的第四种可能的 实现方式中, 所述 CSI包括信道质量指示 CQI和预编码矩阵指示 PMI, 所述 PMI使用的子带大小为所述 CQI使用的子带大小的 N倍, 其中, 所述 CQI使 用的子带大小为所述子带大小配置索引确定的子带大小, 所述 N为正整数。
第二方面, 本发明提供一种 CSI报告方法, 包括:
向 UE发送子带大小配置信息, 所述子带大小配置信息包括 UE特定的子 带大小配置索引;
接收所述 UE发送的 CSI, 其中, 所述 CSI反映至少一个子带上的传输, 所述子带是根据子带大小确定的,所述子带大小是根据所述 UE特定的子带大 小配置索引确定。
在第二方面的第一种可能的实现方式中, 所述方法还包括:
根据所述 UE特定的子带大小配置索引,从子带大小集合中确定所述子带 大小。
结合第二方面的第一种可能的实现方式,在第二方面的第二种可能的实现 方式中, 所述子带大小集合是小区特定的子带大小集合。
结合第二方面的第二种可能的实现方式,在第二方面的第三种可能的实现 方式中, 所述方法还包括:
向所述 UE发送小区特定的子带大小配置索引,所述小区特定的子带大小 集合根据所述小区特定的子带大小配置索引确定的。
结合第二方面上述任一种可能的实现方式,在第二方面的第四种可能的实 现方式中,所述 CSI包括信道质量指示 CQI和预编码矩阵指示 PMI,所述 PMI 使用的子带大小为所述 CQI使用的子带大小的 N倍, 其中, 所述 CQI使用的 子带大小为所述子带大小配置索引确定的子带大小, 所述 N为正整数。
第三方面, 本发明提供用户设备, 包括: 接收单元、 确定单元、 计算单元 和发送单元, 其中:
所述接收单元, 用于接收基站发送的子带大小配置信息, 所述子带大小配 置信息包括 UE特定的子带大小配置索引;
所述确定单元,用于根据所述 UE特定的子带大小配置索引确定子带大小; 所述计算单元, 用于确定 CSI, 其中, 所述 CSI反映至少一个子带上的传 输, 所述子带是根据所述子带大小确定的;
所述发送单元, 用于向所述基站发送所述 CSI。
在第三方面的第一种可能的实现方式中,所述确定单元具体用于根据所述 UE特定的子带大小配置索引, 从子带大小集合中确定一个子带大小。
结合第三方面的第一种可能的实现方式,在第三方面的第二种可能的实现 方式中, 所述子带大小集合是从小区特定的子带大小集合。
结合第三方面的第二种可能的实现方式,在第三方面的第三种可能的实现 方式中,所述接收单元还用于接收所述基站发送的小区特定的子带大小配置索 引;
所述确定单元还用于根据所述小区特定的子带大小配置索引信息确定所 述小区特定的子带大小集合。
结合第三方面的上述任一种可能的实现方式,在第三方面的第四种可能的 实现方式中, 所述 CSI包括信道质量指示 CQI和预编码矩阵指示 PMI, 所述 PMI使用的子带大小为所述 CQI使用的子带大小的 N倍, 其中, 所述 CQI使 用的子带大小为所述子带大小配置索引确定的子带大小, 所述 N为正整数。
第四方面, 本发明提供基站, 包括: 发送单元和接收单元, 其中: 所述发送单元, 用于向 UE发送子带大小配置信息, 所述子带大小配置信 息包括 UE特定的子带大小配置索引;
所述接收单元, 用于接收所述 UE发送的 CSI, 其中, 所述 CSI反映至少 一个子带上的传输, 所述子带是根据子带大小确定的, 所述子带大小根据所述 UE特定的子带大小配置索引确定。
在第四方面的第一种可能的实现方式中, 所述装置还包括:
确定单元, 用于根据所述 UE特定的子带大小配置索引, 从子带大小集合 中确定所述子带大小。
结合第四方面的第一种可能的实现方式,在第四方面的第二种可能的实现 方式中, 所述子带大小集合是小区特定的子带大小集合。
结合第四方面的第二种可能的实现方式,在第四方面的第三种可能的实现 方式中, 所述发送单元还用于向所述 UE发送小区特定的子带大小配置索引, 所述小区特定的子带大小集合根据所述小区特定的子带大小配置索引确定的。
结合第四方面的上述任一种可能的实现方式,在第四方面的第四种可能的 实现方式中, 所述 CSI包括信道质量指示 CQI和预编码矩阵指示 PMI, 所述 PMI使用的子带大小为所述 CQI使用的子带大小的 N倍, 其中, 所述 CQI使 用的子带大小为所述子带大小配置索引确定的子带大小, 所述 N为正整数。
第五方面, 本发明提供一种用户设备, 包括: 接收器和发射器, 以及分别 与所述接收器和发射器连接的处理器, 其中:
所述接收器, 用于接收基站发送的子带大小配置信息, 所述子带大小配置 信息包括 UE特定的子带大小配置索引; 所述处理器, 用于根据所述 UE特定的子带大小配置索引确定子带大小; 所述处理器还用于确定 CSI,其中,所述 CSI反映至少一个子带上的传输, 所述子带是根据所述子带大小确定的;
所述发射器, 用于向所述基站发送所述 CSI。
在第五方面的第一种可能的实现方式中,所述处理器用于根据所述 UE特 定的子带大小配置索引, 从子带大小集合中确定一个子带大小。
结合第五方面的第一种可能的实现方式,在第五方面的第二种可能的实现 方式中, 所述子带大小集合是小区特定的子带大小集合。
结合第五方面的第二种可能的实现方式,在第五方面的第三种可能的实现 方式中, 所述接收器还用于接收所述基站发送的小区特定的子带大小配置索 引,所述小区特定的子带大小集合根据所述小区特定的子带大小配置索引确定 的。
结合第五方面的上述任一种可能的实现方式,在第五方面的第四种可能的 实现方式中, 所述 CSI包括信道质量指示 CQI和预编码矩阵指示 PMI, 所述 PMI使用的子带大小为所述 CQI使用的子带大小的 N倍, 其中, 所述 CQI使 用的子带大小为所述子带大小配置索引确定的子带大小, 所述 N为正整数。
第六方面, 本发明提供一种基站, 包括: 发射器和接收器, 其中: 所述发射器, 用于向 UE发送子带大小配置信息, 所述子带大小配置信息 包括 UE特定的子带大小配置索引;
所述接收器, 用于接收所述 UE发送的 CSI, 其中, 所述 CSI反映至少一 个子带上的传输, 所述子带是根据子带大小确定的, 所述子带大小是根据所述 UE特定的子带大小配置索引确定。
在第六方面的第一种可能的实现方式中, 所述基站还包括:
处理器, 用于根据所述 UE特定的子带大小配置索引, 从子带大小集合中 确定所述子带大小。
结合第六方面的第一种可能的实现方式,在第六方面的第二种可能的实现 方式中, 所述子带大小集合是小区特定的子带大小集合。
结合第六方面的第二种可能的实现方式,在第六方面的第三种可能的实现 方式中, 所述发射器还用于向所述 UE发送小区特定的子带大小配置索引, 所 述小区特定的子带大小集合根据所述小区特定的子带大小配置索引确定的。 结合第六方面的上述任一种可能的实现方式,在第六方面的第四种可能的 实现方式中, 所述 CSI包括信道质量指示 CQI和预编码矩阵指示 PMI, 所述 PMI使用的子带大小为所述 CQI使用的子带大小的 N倍, 其中, 所述 CQI使 用的子带大小为所述子带大小配置索引确定的子带大小, 所述 N为正整数。
上述技术方案中,接收基站发送的子带大小配置信息, 所述子带大小配置 信息包括 UE特定的子带大小配置索引; 根据所述 UE特定的子带大小配置索 引确定子带大小; 确定 CSI, 其中, 所述 CSI反映至少一个子带上的传输, 所 述子带是根据所述子带大小确定的; 向所述基站发送所述 CSI。 这样可以实现 CSI反映的子带的大带大小是由基站指定的 UE特定的子带大小, 这样该子带 大小可以更好地适应该 UE的环境, 从而可以提高通信系统的性能。 附图说明
为了更清楚地说明本发明实施例或现有技术中的技术方案,下面将对实施 例或现有技术描述中所需要使用的附图作简单地介绍,显而易见地, 下面描述 中的附图仅仅是本发明的一些实施例, 对于本领域普通技术人员来讲, 在不付 出创造性劳动的前提下, 还可以根据这些附图获得其他的附图。
图 1是本发明实施例提供的一种 CSI报告方法的流程示意图;
图 2是本发明实施例提供的另一种 CSI报告方法的流程示意图; 图 3 是本发明实施例提供的一种用户设备的结构示意图;
图 4 是本发明实施例提供的另一种基站的结构示意图;
图 5 是本发明实施例提供的一种用户设备的结构示意图;
图 6 是本发明实施例提供的另一种基站的结构示意图。 具体实施方式
下面将结合本发明实施例中的附图,对本发明实施例中的技术方案进行清 楚、 完整地描述, 显然, 所描述的实施例仅仅是本发明一部分实施例, 而不是 全部的实施例。基于本发明中的实施例, 本领域普通技术人员在没有作出创造 性劳动前提下所获得的所有其他实施例, 都属于本发明保护的范围。 本发明实施例, 可以应用于各种通信系统, 例如: 全球移动通信系统
( Global System of Mobile communication , GSM ), 码分多址 ( Code Division Multiple Access , CDMA )系统,宽带码分多址( Wideband Code Division Multiple Access Wireless, WCDMA ),通用分组无线业务( General Packet Radio Service , GPRS ), 长期演进(Long Term Evolution , LTE ) 系统等。
另外, 本发明实施例中 UE, 也可称之为移动终端( Mobile Terminal )、 移 动 UE等, 可以经无线接入网 ( Radio Access Network RAN, )与一个或多个核 心网进行通信, UE可以是移动终端或者移动台 ( Mobile Station , MS ), 如移 动电话(或称为"蜂窝"电话)和具有移动终端的计算机, 例如, 可以是便携式、 袖珍式、 手持式、 计算机内置的或者车载的移动装置; UE 还可以是中继 ( Relay ); 它们与无线接入网交换语言和 /或数据。
另夕卜, 本发明实施例中基站可以是 GSM或 CDMA中的基站( BTS, Base Transceiver Station ), 也可以是 WCDMA中的基站(NodeB ), 还可以是 LTE 中的演进型节点 B ( eNB或 evolved Node B , e-NodeB )或者中继 (Relay ), 本发明实施例对此并不限定。
图 1是本发明实施例提供的一种 CSI报告方法的流程示意图,该方法可以 应用于 UE, 如图 1所示, 包括:
101、接收基站发送的子带大小配置信息,所述子带大小配置信息包括 UE 特定的子带大小配置索引。
可选的, 可以通过 UE特定的 (UE specific )信令, 如专用的无线资源控 制( Radio Resource Control , 简称 RRC )信令, 或者下行控制信息( Downlink Control Information, 简称 DCI ), 接收所述子带大小配置信息。
102、 根据所述 UE特定的子带大小配置索引确定子带大小。
可选的,可以根据 UE特定的子带大小配置索引与子带大小之间的映射关 系得到子带大小。 显然, 所得到的子带大小是 UE特定的子带大小。
103、 确定 CSI, 其中, 所述 CSI反映至少一个子带上的传输, 所述子带 是根据所述子带大小确定的。
可选的, 根据所述子带大小, 可以将系统带宽划分为多个子带。 所述 CSI 反映的一个或者多个子带, 可以是根据所述子带划分确定。 显然, 这种子带划 分也是 UE特定的。 不同的 UE, 其子带大小可能不同。
可选的,所述 CSI可以包括信道质量指示( Channel Quality Indicator/Index, 简称 CQI )或者预编码矩阵指示( Precoding Matrix Indicator, 简称 PMI )或者 秩指示 ( Rank Indicator, 简称 RI )等。
104、 向所述基站发送所述 CSI。
可选的, 可以通过物理上行控制信道(Physical Uplink Contol Channel, 简 称 PUCCH )或者物理上行共享信道 ( Physical Uplink Shared Channel, 简称 PUSCH ) 向基站发送所述 CSI。
可选的, 由于 UE所处的小区环境不同, UE与基站之间的信道传播具有 不同的时延扩展,从而具有不同的相关带宽,相关带宽往往与时延扩展成反比。 例如处于市区微小区 ( Urban Micro cell, UMi ) 的 UE往往比处于市区宏小区
( Urban Macro cell, UMa )的 UE具有更大的时延扩展, 从而具有更小的相关 带宽; 此外, 即使同一小区内, UE的位置不同, 特别是 UE与基站之间的距 离或者 UE的高度不同,也将导致 UE与基站之间的传播具有不同的时延扩展。 在上述情况下, 基站可以为 UE确定 UE特定(UE specific )的子带大小配置。 例如: 可以根据 UE与基站之间信道的相干带宽确定的 UE特定( UE specific ) 的子带大小,如将 UE与基站之间信道的相干带宽的相似度大于预设阔值的子 带大小确定为 UE特定(UE specific ) 的子带大小。 上述预设阔值可以是基站 与 UE预先协商的, 也可以是用户设置的, 例如: 90%、 95%或者 100%等值。 从而保证上述目标子带大小与上述相干带宽的大小比较相近甚至相等。且在实 际中, 上述相干带宽可能是随便用户的所处的位置而变化,通过上述步骤就可 以实现 UE特定(UE specific ) 的子带大小也是随便用户所处的位置而变化。
可选的, 基站可以通过测量 UE 的上行物理信号, 例如探测参考信号
( Sounding Referene Signal, 简称 SRS )或者上行解调参考信号 (DeModulation Reference Signal,简称 DMRS), 得到上行信道的时延扩展或者相关带宽
( coherence bandwidth ), 基于信道互异 'Ι"生 ( reciprocity ), 可以得到下行信道的 时延扩展或者相关带宽, 从而为 UE确定子带大小; 类似地, 基站也可以通过 测量 UE的上行物理信道, 例如物理上行控制信道(Physical Uplink Contronl CHannel , 简称 PUCCH ) 或者物理上行共享信道 ( Physical Uplink Shared CHannel, 简称 PUSCH ), 为 UE确定子带大小。 由于不同的 UE与基站之间 的信道是 UE特定的, 因此, 基于上述信道测量得到的子带大小也是 UE特定 的。
可选的,基站可以通过向 UE发送 UE特定的子带大小配置索引(subband size configuration index )通知 UE使用 UE特定的子带大小, 其中所述 UE使 用的 UE特定的子带大小与所述 UE特定的子带大小配置索引向对应。 UE通 过接收基站发送的 UE特定的子带大小配置索引, 可以基于所接收的 UE特定 的子带大小配置索引确定一个子带大小。
具体地,所述 UE特定的子带大小配置索引可以用于指示一个预定义的子 带大小集合中的元素, 其中每个元素为一个子带大小。 或者, 所述 UE特定的 子带大小是所述 UE特定的子带大小配置索引的函数,该函数可以是预定义的。 其中所述预定义的子带大小集合或者所述预定义的函数为 UE和基站双方所共 知。 UE根据所接收的 UE特定的子带大小配置信息, 基于所述预定义的子带 大小集合或者函数, 可以确定 UE特定的子带大小。
本实施例中的子带大小是根据 UE特定的 (UE specific )子带大小配置索 引得到的, 从而使得 UE能够基于所述 UE特定的子带大小计算并反馈 CSI。 这样可以实现 CSI反映的子带的大带大小是由基站指定的 UE特定的子带大 小, 这样该子带大小可以更好地适应该 UE的环境, 从而可以提高通信系统的 性能。 另外, 所述 UE特定的子带大小配置使得所述用户能够根据系统配置自 适应不同的传播环境,特别是自适应 UE与基站之间信道的相干带宽 (coherence bandwidth)的变化。 另外, 由于 CSI的子带大小是 UE特定的子带大小, 这样 就可以提高 CSI反馈的精度, 从而提高系统性能。
可选地, 作为一个实施例, 在步骤 101之前, UE还可以向基站上报子带 大小指示。 基站可以根据 UE上报的子带大小指示确定 UE特定的子带大小配 置索引。所述子带大小指示可以与基站配置的 UE特定的子带大小配置索引相 同。具体地, UE还可以通过测量下行参考信号,例如小区特定的参考信号( Cell specific Reference Signal,简称 CRS )或者信道状态信息参考信号( Channel State Information Reference Signal, 简称 CSI-RS ), 得到 UE与基站之间的信道的时 延扩展或者相干带宽, 并基于时延扩展或者相干带宽选择一个子带大小, 其中 所述子带大小指示与所选择的一个子带大小相对应。
可选地, 作为另一实施例, 步骤 102中所述根据所述 UE特定的子带大小 配置索引确定一个子带大小, 包括
根据所述 UE特定的子带大小配置索引, 从子带大小集合中确定一个子带 大小。
可选的, 所述子带大小集合可以包括多个相同或者不同的子带大小。 所述 子带大小配置索引用于指示所述子带大小集合中的一个子带大小。所述子带大 小集合中中的每一个子带大小均存在一个子带大小配置索引与之对应。需要进 一步指出的是, 所述子带大小集合可以包含多个子带大小相同的值。
所述子带大小集合或者子带大小配置索引与所述子带大小集合中的各个 子带大小之间的映射或对应关系可以是预定义的 (predefined ), 为 UE与基站 所共知。 例如, 与不同的子带大小配置索引对应的子带大小可以如表 1所示。
表 1 : 子带大小 K与 UE特定的子带大小配置索引
Figure imgf000011_0001
其中, SCIUE表示子带大小配置索引, 上述 B表示为子带大小的单位, 例 如 B可以是一个或者多个物理资源块( Physical Resource Block, PRB ), K表 示以 Β为单位的子带大小。 例如: 当 SCIUE为 1 (即上述子带大小配置索引信 息为 1 ) 时, 就上述步骤 102确定的子带大小为 2B, 当 SCIUE为 2时, 步骤 102确定的子带大小就为 2B。
可选的, UE根据接收到的 UE特定的子带大小配置索引可以从上表的子 带大小集合中得到子带大小, 例如 UE特定的子带大小配置索引 SCIUE为 0, 1, 2和 3时, 可以得到子带大小 K分别为 B, 2B , 3B和 4B, 其中 B可以为 1。 此外, 所述子带大小与也可以是预定义的子带大小配置索引的函数。
进一步地, 所述子带大小集合可以是一个小区特定的( cell specific )子带 大小集合。
可选的, 步骤 102具体可以包括:
根据所述 UE特定的子带大小配置索引,从小区特定的子带大小集合中确 定一个子带大小。
可选地,所述小区特定的子带大小集合由基站通知的小区特定的子带大小 配置索引所指示。 例如: 所述方法还可以包括:
接收所述基站发送的小区特定的子带大小配置索引,所述小区特定的子带 大小集合根据所述小区特定的子带大小配置索引确定的。
这样就可以根据据所述小区特定的子带大小配置索引确定上述小区特定 的子带大小集合。
可选的, 与小区特定的子带大小配置索引对应的小区特定的子带大小集 合, 可以如表 2所示。
表 2: 子带大小 K与小区和 UE特定的子带大小配置索引 SC/ce//
Figure imgf000012_0001
其中, SCICELL表示小区特定的子带大小集合配置索引, SCIUE表示 UE特定 的子带大小配置索引,Κ表示对应的子带大小,Β是子带大小的单位, Β可以是 一个或者多个 PRB。 例如, 当 SCICELL为 1 (即上述小区特定的子带大小集合配 置索引为 1 )时,与之对应的小区特定的子带大小集合中包含的子带大小为 { B, 4 B , 6 B , 8 B }; 当 SCIUE为 1 (即上述 UE特定的子带大小配置索引为 1 ) 小为 4B。
可选地,所述小区特定的子带大小配置索引也可以是小区类型或者根据小 区标识(cell lD )得到。
可选的,所述方法中步骤 101中所述带大小集合配置信息还可以包括小区 特定的子带大小配置索引;步骤 102中所述小区特定的子带大小集合根据所述 小区特定的子带大小配置索引确定。 可选地, 作为另一实施例, 步骤 102具体可以包括:
根据所述小区特定的子带大小集合配置索引和所述 UE特定的子带大小配 置索引, 从子带大小集合中确定一个子带大小。
其中, 所确定的一个子带大小为上述小区特定的子带大小配置索引和 UE 特定的子带大小配置索引的一个子带大小。具体可以是先根据小区特定的子带 大小配置索引确定小区特定的子带大小集合,再根据 UE特定的子带大小配置 索引从所述小区特定的子带大小集合中确定一个子带大小。还可以是根据所述 小区特定的子带大小配置索引和所述 UE特定的子带大小配置索引一起从子带 大小集合中确定一个子带大小。如表 2表示, 当上述小区特定的子带大小配置 索引为 1且上述 UE特定的子带大小配置索引为 1, 直接可以确定子带大小为 4B的子带大小。 具体还可以是根据所述 UE特定的子带大小配置索引确定多 个子带大小 (属于不同的小区特定的子带大小集合), 再根据所述小区特定的 子带大小配置索引确定一个子带大小,即得到小区特定的子带大小集合包括的 根据所述 UE特定的子带大小配置索引确定的子带大小。 如表 2表示, 当上述 小区特定的子带大小配置索引为 1且上述 UE特定的子带大小配置索引为 1, 可以先根据上述 UE特定的子带大小配置索引 1确定子带大小 2B、 4B、 2B和 4B , 再根据小区特定的子带大小配置索引 1确定子带大小集合 1, 从而确定子 带大小集合 1包括的子带大小 4B。
本实施例中, UE是根据 UE特定的(UE specific )子带大小配置索引从小 区特定的子带大小集合中得到子带大小,从而使得 UE能够基于不同的小区环 境(例如宏小区和微小区中不同的无线传播特性), 得到所述 UE特定的子带 大小, 计算并反馈 CSI。 从而所述 UE特定的子带大小配置使得所述用户能够 根据系统配置自适应不同的传播环境特别是不同的小区环境中的无线传播特 性, 特别是自适应 UE与基站之间信道的相干带宽 (coherence bandwidth)的变 化, 提高 CSI反馈的精度, 从而提高系统性能。
可选地, 作为另一实施例, 所述步骤 103中的 CSI, 可以包括信道质量指 示 CQI和预编码矩阵指示 PMI或者秩指示 RI。
其中, 预编码矩阵指示 PMI或者秩指示 RI所对应的子带大小可以是信道 质量指示 CQI所对应的子带大小的整数倍。 另外, 预编码矩阵指示 PMI所对 应的子带大小可以理解为 PMI使用的子带大小, RI所对应的子带大小可以理 解为 RI使用的子带大小, CQI所对应的子带大小可以理解为 CQI使用的子带 大小; 其中, 所述 CQI使用的子带大小为所述子带大小配置索引确定的子带 大小。 例如, 预编码矩阵指示 PMI或者秩指示 RI所对应的子带大小可以是信 道质量指示 CQI所对应的子带大小的 N倍, N为大于等于 1的整数。 N的具 体取值可以根据 UE的传输模式或者 CSI报告模式确定。
可选的, 由于信道质量指示 CQI通常用于调度和用户配对, CQI比 PMI 或者 RI具有更强的频率选择性。 CQI所对应的子带大小是预编码矩阵指示 PMI 或者秩指示 RI所对应的子带大小的 1/N, 更有利于实现频率选择性调度, 从 而提高提供的吞吐量。
本实施例中, UE是根据 UE特定的(UE specific )子带大小配置索引从小 区特定的子带大小集合中得到子带大小, 预编码矩阵指示 PMI或者秩指示 RI 所对应的子带大小是信道质量指示 CQI所对应的子带大小的整数倍。 从而所 述 UE特定的子带大小配置使得所述用户能够根据系统配置自适应不同的频率 选择性, 特别是自适应 UE与基站之间信道的相干带宽 (coherence bandwidth) 的变化, 提高 CSI反馈的精度, 从而提高系统性能。 图 2是本发明实施例提供的另一种 CSI报告方法的流程示意图,该方法可 以应用于基站, 如图 2所示, 包括:
201、 向 UE发送子带大小配置信息, 所述子带大小配置信息包括 UE特 定的子带大小配置索引。
可选的, 基站可以通过 UE特定的 (UE specific )信令, 如专用的无线资 源控制 RRC信令, 或者下行控制信息 DCI, 向 UE发送所述子带大小配置信 息。
可选的, UE接收到该子带大小配置信息后, 可以根据所述 UE特定的子 带大小配置索引确定子带大小; 并计算 CSI, 其中, 所述 CSI反映至少一个子 带上的传输, 所述子带是根据所述子带大小确定的; 再向所述基站发送的所述 CSI。
202、 接收所述 UE发送的 CSI, 其中, 所述 CSI反映至少一个子带上的 传输, 所述子带是根据子带大小确定的, 所述子带大小根据所述 UE特定的子 带大小配置索引确定。
可选的, 可以通过物理上行控制信道(Physical Uplink Contol Channel, 简 称 PUCCH )或者物理上行共享信道 ( Physical Uplink Shared Channel, 简称 PUSCH )接收所述 UE发送的 CSI。
可选的, 所述 CSI反映至少一个子带上的传输。基站可以根据其发送的所 述 UE特定的子带大小配置索引, 确定所述 UE使用的子带大小, 并根据所述 子带大小将系统带宽划分为多个子带,从而确定接收到的所述 CSI反映的一个 或者多个子带的大小及其对应的位置。从而便于将所述至少一个子带上的 CSI 信息用户调度。 显然, 这种子带划分也是 UE特定的。 不同的 UE, 其子带大 小可能不同。
可选的, 由于 UE所处的小区环境不同, UE与基站之间的信道传播具有 不同的时延扩展,从而具有不同的相关带宽,相关带宽往往与时延扩展成反比。 例如处于市区微小区 ( Urban Micro cell, UMi ) 的 UE往往比处于市区宏小区
( Urban Macro cell, UMa )的 UE具有更大的时延扩展, 从而具有更小的相关 带宽; 此外, 即使同一小区内, UE的位置不同, 特别是 UE与基站之间的距 离或者 UE的高度不同,也将导致 UE与基站之间的传播具有不同的时延扩展。 在上述情况下, 基站可以为 UE确定 UE特定(UE specific )的子带大小配置。 例如: 可以根据 UE与基站之间信道的相干带宽确定的 UE特定( UE specific ) 的子带大小,如将 UE与基站之间信道的相干带宽的相似度大于预设阔值的子 带大小确定为 UE特定(UE specific ) 的子带大小。 上述预设阔值可以是基站 与 UE预先协商的, 也可以是用户设置的, 例如: 90%、 95%或者 100%等值。 从而保证上述目标子带大小与上述相干带宽的大小比较相近甚至相等。且在实 际中, 上述相干带宽可能是随便用户的所处的位置而变化,通过上述步骤就可 以实现 UE特定(UE specific ) 的子带大小也是随便用户所处的位置而变化。
可选的, 基站可以通过测量 UE 的上行物理信号, 例如探测参考信号
( Sounding Referene Signal, 简称 SRS )或者上行解调参考信号( DeModulation Reference Signal,简称 DMRS ), 得到上行信道的时延扩展或者相关带宽
( coherence bandwidth ), 基于信道互异 'Ι"生 ( reciprocity ), 可以得到下行信道的 时延扩展或者相关带宽, 从而为 UE确定子带大小; 类似地, 基站也可以通过 测量 UE的上行物理信道, 例如物理上行控制信道(Physical Uplink Contronl CHannel , 简称 PUCCH ) 或者物理上行共享信道 ( Physical Uplink Shared CHannel, 简称 PUSCH ), 为 UE确定子带大小。 由于不同的 UE与基站之间 的信道是 UE特定的, 因此, 基于上述信道测量得到的子带大小也是 UE特定 的。
可选的,基站可以通过向 UE发送 UE特定的子带大小配置索引(subband size configuration index )通知 UE使用 UE特定的子带大小, 其中所述 UE使 用的 UE特定的子带大小与所述 UE特定的子带大小配置索引向对应。
可选的, 上述方法具体可以应用于基站, 即基站可以实现上述方法。
本实施例中, 基站向 UE发送 UE特定的子带大小配置索引, 从而使得 UE 能够基于所述 UE特定的子带大小配置索引对应的子带大小计算并反馈 CSI。 这样可以实现 CSI反映的子带的大带大小是由基站指定的 UE特定的子 带大小, 这样该子带大小可以更好地适应该 UE的环境, 从而可以提高通信系 统的性能。另外,可以实现 CSI反映的子带的大带大小是由基站指定的,从而, 基站可以使得所述用户能够根据系统配置自适应不同的传播环境,特别是自适 应 UE与基站之间信道的相干带宽 (coherence bandwidth)的变化。 另夕卜, 由于 CSI的子带大小是 UE特定的子带大小, 这样就可以提高 CSI反馈的精度, 从 而提高系统性能。
可选地, 作为一个实施例, 在步骤 201之前, 基站还可以接收 UE上报的 子带大小指示。 基站可以根据 UE上报的子带大小指示确定 UE特定的子带大 小配置索引。所述子带大小指示可以与基站配置的 UE特定的子带大小配置索 引相同。 具体地, UE还可以通过测量下行参考信号, 例如小区特定的参考信 号 CRS或者信道状态信息参考信号 CSI-RS , 得到 UE与基站之间的信道的时 延扩展或者相干带宽, 并基于时延扩展或者相干带宽选择一个子带大小, 其中 所述子带大小指示与所选择的一个子带大小相对应。
可选地, 作为另一实施例, 所述方法可以包括:
根据所述 UE特定的子带大小配置索引,从子带大小集合中确定所述子带 大小。 由于, 上述子带大小是基站通知给 UE的, 这样基站再根据通知给 UE的 信息,确定 UE报告的 CSI使用的子带,即基站默认 UE按照基站的通知执行。
可选的, 所述子带大小集合可以包括多个相同或者不同的子带大小。 所述 子带大小配置索引用于指示所述子带大小集合中的一个子带大小。所述子带大 小集合中中的每一个子带大小均存在一个子带大小配置索引与之对应。需要进 一步指出的是, 所述子带大小集合可以包含多个子带大小相同的值。
可选的,子带大小集合或者子带大小配置索引与所述子带大小集合中的各 个子带大小之间的映射或对应关系可以是预定义的 (predefined ), 为 UE与基 站所共知。例如,与不同的子带大小配置索引对应的子带大小可以如表 1所示。 上表的子带大小集合中得到子带大小, 例如 UE 特定的子带大小配置索引 SCIUE为 0, 1, 2和 3时, 可以得到子带大小 K分别为 B, 2B , 3B和 4B, 其中 B可以为 1。 此外, 所述子带大小也可以是预定义的子带大小配置索引的 函数。
进一步地, 所述子带大小集合可以是一个小区特定的( cell specific )子带 大小集合。
可选的, 所述方法还可以包括:
向所述 UE发送小区特定的子带大小配置索引,所述小区特定的子带大小 集合根据所述小区特定的子带大小配置索引确定的。
可选地,所述小区特定的子带大小集合由基站通知的小区特定的子带大小 配置索引所指示。 具体地, 与小区特定的子带大小配置索引对应的小区特定的 子带大小集合, 可以如表 2所示。
可选地,所述小区特定的子带大小配置索引也可以是小区类型或者根据小 区标识(cell lD )得到。
可选的,所述方法中步骤 201中所述带大小集合配置信息还可以包括小区 特定的子带大小配置索引;以上所述小区特定的子带大小集合根据所述小区特 定的子带大小配置索引确定。
可选地, 作为另一实施例, 所述子带大小还可以是根据所述 UE特定的子 带大小配置索引,从小区特定的子带大小集合中确定, 其中所述小区特定的子 带集合根据所述小区特定的子带大小配置索引确定。或者所述子带大小还可以 是根据所述小区特定的子带大小配置索引和 UE特定的子带大小配置索引,从 子带大小集合中确定。
具体地,可以先根据小区特定的子带大小配置索引确定小区特定的子带大 小集合,再根据 UE特定的子带大小配置索引从所述小区特定的子带大小集合 中确定一个子带大小。还可以是根据所述小区特定的子带大小配置索引和所述 UE特定的子带大小配置索引一起从子带大小集合中确定一个子带大小。 如表 2表示, 当上述小区特定的子带大小配置索引为 2且上述 UE特定的子带大小 配置索引为 3, 直接可以确定子带大小为 8B的子带大小。 具体还可以是根据 所述 UE特定的子带大小配置索引确定多个子带大小(属于不同的小区特定的 子带大小集合),再根据所述小区特定的子带大小配置索引确定一个子带大小, 即得到小区特定的子带大小集合包括的根据所述 UE特定的子带大小配置索引 确定的子带大小。如表 2表示, 当上述小区特定的子带大小配置索引为 0且上 述 UE特定的子带大小配置索引为 1, 可以先根据上述 UE特定的子带大小配 置索引 1确定子带大小 2B、 4B、 2B和 4B, 再根据小区特定的子带大小配置 索引 0确定子带大小集合 0, 从而确定子带大小集合 0包括的子带大小 2B。
本实施例中, 基站通过小区特定的子带大小配置索引和 UE特定的 (UE specific )子带大小配置索引, 配置所述 UECSI反馈使用的子带大小从小区特 定的子带大小集合中得到, 从而使得 UE能够基于不同的小区环境(例如宏小 区和微小区中不同的无线传播特性), 得到所述 UE特定的子带大小, 计算并 反馈 CSI。 从而, 所述 UE特定的子带大小配置使得所述用户能够根据系统配 置自适应不同的传播环境特别是不同的小区环境中的无线传播特性,特别是自 适应 UE与基站之间信道的相干带宽 (coherence bandwidth)的变化, 提高 CSI 反馈的精度, 从而提高系统性能。
可选地, 作为另一实施例, 所述步骤 202中的 CSI, 可以包括信道质量指 示 CQI和预编码矩阵指示 PMI或者秩指示 RI。
其中, 预编码矩阵指示 PMI或者秩指示 RI所对应的子带大小可以是信道 质量指示 CQI所对应的子带大小的 N倍。 另外, 预编码矩阵指示 PMI所对应 的子带大小可以理解为 PMI使用的子带大小, RI所对应的子带大小可以理解 为 RI使用的子带大小, CQI所对应的子带大小可以理解为 CQI使用的子带大 小; 其中, 所述 CQI使用的子带大小为所述子带大小配置索引确定的子带大 小。 N为大于等于 1的整数。 N的具体取值可以根据 UE的传输模式或者 CSI 报告模式确定。
由于信道质量指示 CQI通常用于调度和用户配对, CQI比 PMI或者 RI 具有更强的频率选择性。 CQI所对应的子带大小是预编码矩阵指示 PMI或者 秩指示 RI所对应的子带大小的 1/N, 更有利于实现频率选择性调度, 从而提 高提供的吞吐量。
本实施例中, 基站通过 UE特定的 (UE specific )子带大小配置索引, 配 置所述 UECSI反馈使用 UE特定的的子带大小,从而使得 UE能够基于不同的 无线传播特性, 得到所述 UE特定的子带大小, 计算并反馈 CSI。 其中, 预编 码矩阵指示 PMI或者秩指示 RI所对应的子带大小是信道质量指示 CQI所对应 的子带大小的整数倍。从而所述 UE特定的子带大小配置使得所述用户能够根 据系统配置自适应不同的频率选择性,特别是自适应 UE与基站之间信道的相 干带宽 (coherence bandwidth)的变化, 提高 CSI反馈的精度, 从而提高系统性 h
fj匕。 下面为本发明装置实施例,本发明装置实施例用于执行本发明方法实施例 一至二实现的方法, 为了便于说明, 仅示出了与本发明实施例相关的部分, 具 体技术细节未揭示的, 请参照本发明实施例一和实施例二。 图 3 是本发明实施例提供的一种用户设备的结构示意图, 如图 3所示, 包括: 接收单元 31、 确定单元 32、 计算单元 33和发送单元 34, 其中:
接收单元 31, 用于接收基站发送的子带大小配置信息, 所述子带大小配 置信息包括 UE特定的子带大小配置索引。
可选的, 可以通过 UE特定的信令, 如专用的无线资源控制 RRC信令, 或者下行控制信息 DCI, 接收所述子带大小配置信息。
确定单元 32, 用于根据所述 UE特定的子带大小配置索引确定子带大小。 可选的, 确定单元 32可以根据 UE特定的子带大小配置索引与子带大小 之间的映射关系得到子带大小。
计算单元 33,用于确定 CSI,其中,所述 CSI反映至少一个子带上的传输, 所述子带是根据所述子带大小确定的。
可选的, 根据所述子带大小, 可以将系统带宽划分为多个子带。 所述 CSI 反映的一个或者多个子带, 可以是根据所述子带划分确定。 显然, 这种子带划 分也是 UE特定的。 不同的 UE, 其子带大小可能不同。
可选的, 所述 CSI可以包括信道质量指示 CQI或者预编码矩阵指示 PMI 或者秩指示 RI等。
发送单元 34, 用于向所述基站发送所述 CSI。
本实施例中的子带大小是根据 UE特定的 (UE specific )子带大小配置索 引得到的, 从而使得 UE能够基于所述 UE特定的子带大小计算并反馈 CSI。 这样可以实现 CSI反映的子带的大带大小是由基站指定的 UE特定的子带大 小, 这样该子带大小可以更好地适应该 UE的环境, 从而可以提高通信系统的 性能。 另外, 所述 UE特定的子带大小配置使得所述用户能够根据系统配置自 适应不同的传播环境,特别是自适应 UE与基站之间信道的相干带宽 (coherence bandwidth)的变化。 另外, 由于 CSI的子带大小是 UE特定的子带大小, 这样 就可以提高 CSI反馈的精度, 从而提高系统性能。
可选地, 作为一个实施例, 所述发送单元 34还可以用于向基站上报子带 大小指示。 基站可以根据 UE上报的子带大小指示确定 UE特定的子带大小配 置索引。所述子带大小指示可以与基站配置的 UE特定的子带大小配置索引相 同。具体地, UE还可以通过测量下行参考信号,例如小区特定的参考信号 CRS ) 或者信道状态信息参考信号 CSI-RS , 得到 UE与基站之间的信道的时延扩展 或者相干带宽, 并基于时延扩展或者相干带宽选择一个子带大小, 其中所述子 带大小指示与所选择的一个子带大小相对应。 子带大小配置索引, 从子带大小集合中确定一个子带大小。
具体地, 所述子带大小集合可以包括多个相同或者不同的子带大小。 所述 子带大小配置索引用于指示所述子带大小集合中的一个子带大小。所述子带大 小集合中中的每一个子带大小均存在一个子带大小配置索引与之对应。需要进 一步指出的是, 所述子带大小集合可以包含多个子带大小相同的值。 所述子带 大小集合或者子带大小配置索引与所述子带大小集合中的各个子带大小之间 的映射或对应关系可以是预定义的(predefined ), 为 UE与基站所共知。 例如, 与不同的子带大小配置索引对应的子带大小可以如表 1所示。
进一步地, 所述子带大小集合可以是一个小区特定的( cell specific )子带 大小集合。 子带大小配置索引, 从小区特定的子带大小集合中确定一个子带大小。
可选地, 接收单元 31还可以用于接收所述基站发送的小区特定的子带大 小配置索引;
确定单元 32可以用于根据所述小区特定的子带大小配置索引确定所述小 区特定的子带大小集合。
可选地,所述小区特定的子带大小集合由基站通知的小区特定的子带大小 配置索引所指示。 具体地, 与小区特定的子带大小配置索引对应的小区特定的 子带大小集合, 可以如表 2所示。
可选地,所述小区特定的子带大小配置索引也可以是小区类型或者根据小 区标识(cell lD )得到。
可选的, 所述接收单元 31接收的子带大小配置信息还可以包括小区特定 的子带大小配置索引; 即接收单元 31还可以用于接收所述基站发送的小区特 定的子带大小配置索引; 这样确定单元 32所用的所述小区特定的子带大小集 合根据所述小区特定的子带大小配置索引确定, 即确定单元 32还可以用于根 据所述小区特定的子带大小配置索引信息确定所述小区特定的子带大小集合。
可选地, 作为另一实施例, 所述确定单元 32可以用于才艮据所述小区特定 的子带大小集合配置索引和所述 UE特定的子带大小配置索引,从子带大小集 合中确定一个子带大小。
其中, 所确定的一个子带大小为上述小区特定的子带大小配置索引和 UE 特定的子带大小配置索引的一个子带大小。具体可以是先根据小区特定的子带 大小配置索引确定小区特定的子带大小集合,再根据 UE特定的子带大小配置 索引从所述小区特定的子带大小集合中确定一个子带大小。还可以是根据所述 小区特定的子带大小配置索引和所述 UE特定的子带大小配置索引一起从子带 大小集合中确定一个子带大小。如表 2表示, 当上述小区特定的子带大小配置 索引为 1且上述 UE特定的子带大小配置索引为 1, 直接可以确定子带大小为 4B的子带大小。 具体还可以是根据所述 UE特定的子带大小配置索引确定多 个子带大小 (属于不同的小区特定的子带大小集合), 再根据所述小区特定的 子带大小配置索引确定一个子带大小,即得到小区特定的子带大小集合包括的 根据所述 UE特定的子带大小配置索引确定的子带大小。 如表 2表示, 当上述 小区特定的子带大小配置索引为 1且上述 UE特定的子带大小配置索引为 1, 可以先根据上述 UE特定的子带大小配置索引 1确定子带大小 2B、 4B、 2B和 4B , 再根据小区特定的子带大小配置索引 1确定子带大小集合 1, 从而确定子 带大小集合 1包括的子带大小 4B。
本实施例中, 所述用户设备根据 UE特定的 (UE specific )子带大小配置 索引从小区特定的子带大小集合中得到子带大小,从而使得 UE能够基于不同 的小区环境(例如宏小区和微小区中不同的无线传播特性), 得到所述 UE特 定的子带大小, 计算并反馈 CSI。 从而所述 UE特定的子带大小配置使得所述 用户能够根据系统配置自适应不同的传播环境特别是不同的小区环境中的无 线传播特性, 特别是自适应 UE 与基站之间信道的相干带宽(coherence bandwidth)的变化, 提高 CSI反馈的精度, 从而提高系统性能。
可选地, 作为另一实施例, 所述发送单元 34, 用于向所述基站发送所述 CSI,其中所述 CSI可以包括信道质量指示 CQI和预编码矩阵指示 PMI或者秩 指示 RI。
其中, 预编码矩阵指示 PMI或者秩指示 RI所对应的子带大小可以是信道 质量指示 CQI所对应的子带大小的 N倍。 另外, 预编码矩阵指示 PMI所对应 的子带大小可以理解为 PMI使用的子带大小, RI所对应的子带大小可以理解 为 RI使用的子带大小, CQI所对应的子带大小可以理解为 CQI使用的子带大 小; 其中, 所述 CQI使用的子带大小为所述子带大小配置索引确定的子带大 小。 N为正整数。 N的具体取值可以根据 UE的传输模式或者 CSI报告模式确 定。
由于信道质量指示 CQI通常用于调度和用户配对, CQI比 PMI或者 RI 具有更强的频率选择性。 CQI所对应的子带大小是预编码矩阵指示 PMI或者 秩指示 RI所对应的子带大小的 1/N, 更有利于实现频率选择性调度, 从而提 高提供的吞吐量。
本实施例中, 所述用户设备根据 UE特定的 (UE specific )子带大小配置 索引从小区特定的子带大小集合中得到子带大小, 预编码矩阵指示 PMI或者 秩指示 RI所对应的子带大小是信道质量指示 CQI所对应的子带大小的整数 倍。从而所述 UE特定的子带大小配置使得所述用户能够根据系统配置自适应 不同的频率选择性, 特别是自适应 UE与基站之间信道的相干带宽 (coherence bandwidth)的变化, 提高 CSI反馈的精度, 从而提高系统性能。 图 4是本发明实施例提供的一种基站的结构示意图, 如图 4所示, 包括: 发送单元 41和接收单元 42, 其中:
发送单元 41,用于向 UE发送子带大小配置信息,所述子带大小配置信息 包括 UE特定的子带大小配置索引。
可选的, 可以通过 UE特定的 (UE specific )信令, 如专用的无线资源控 制 RRC信令, 或者下行控制信息 DCI, 向 UE发送所述子带大小配置信息。
可选的, UE接收到该子带大小配置信息后, 可以根据所述 UE特定的子 带大小配置索引确定子带大小; 并计算 CSI, 其中, 所述 CSI反映至少一个子 带上的传输, 所述子带是根据所述子带大小确定的; 再向所述基站发送所述 CSI。
接收单元 42, 用于接收所述 UE发送的 CSI, 其中, 所述 CSI反映至少一 个子带上的传输, 所述子带是根据子带大小确定的, 所述子带大小根据所述 UE特定的子带大小配置索引确定。
可选的, 可以通过物理上行控制信道 PUCCH 或者物理上行共享信道 PUSCH接收所述 UE发送的 CSI。
可选的, 由于 UE ( UE )所处的小区环境不同, UE与基站之间的信道传 播具有不同的时延扩展,从而具有不同的相关带宽,相关带宽往往与时延扩展 成反比。 例如处于市区微小区( Urban Micro cell,UMi )的 UE往往比处于市区 宏小区( Urban Macro cell, UMa )的 UE具有更大的时延扩展, 从而具有更小 的相关带宽; 此外, 即使同一小区内, UE的位置不同, 特别是 UE与基站之 间的距离或者 UE的高度不同, 也将导致 UE与基站之间的传播具有不同的时 延扩展。 在上述情况下, 基站可以为 UE确定 UE特定(UE specific ) 的子带 大小配置。例如:可以根据 UE与基站之间信道的相干带宽确定的 UE特定( UE specific )的子带大小, 如将 UE与基站之间信道的相干带宽的相似度大于预设 阔值的子带大小确定为 UE特定(UE specific ) 的子带大小。 上述预设阔值可 以是基站与 UE预先协商的,也可以是用户设置的,例如: 90%、 95%或者 100% 等值。 从而保证上述目标子带大小与上述相干带宽的大小比较相近甚至相等。 且在实际中, 上述相干带宽可能是随便用户的所处的位置而变化,通过上述步 骤就可以实现 UE特定(UE specific ) 的子带大小也是随便用户所处的位置而 变化。
本实施例中, 基站向 UE发送 UE特定的子带大小配置索引, 从而使得 UE 能够基于所述 UE特定的子带大小配置索引对应的子带大小计算并反馈 CSI。 这样可以实现 CSI反映的子带的大带大小是由基站指定的 UE特定的子 带大小, 这样该子带大小可以更好地适应该 UE的环境, 从而可以提高通信系 统的性能。另外,可以实现 CSI反映的子带的大带大小是由基站指定的,从而, 基站可以使得所述用户能够根据系统配置自适应不同的传播环境,特别是自适 应 UE与基站之间信道的相干带宽 (coherence bandwidth)的变化。 另夕卜, 由于 CSI的子带大小是 UE特定的子带大小, 这样就可以提高 CSI反馈的精度, 从 而提高系统性能。
可选地, 作为一个实施例, 所述接收单元 42还可以用于接收 UE上报的 子带大小指示。 根据 UE上报的子带大小指示确定 UE特定的子带大小配置索 引。 所述子带大小指示可以与基站配置的 UE特定的子带大小配置索引相同。 具体地, UE还可以通过测量下行参考信号, 例如小区特定的参考信号 CRS或 者信道状态信息参考信号 CSI-RS , 得到 UE与基站之间的信道的时延扩展或 者相干带宽, 并基于时延扩展或者相干带宽选择一个子带大小, 其中所述子带 大小指示与所选择的一个子带大小相对应。
可选地, 作为另一实施例, 所述基站还可以括:
确定单元 43,用于根据所述 UE特定的子带大小配置索引从子带大小集合 中确定所述子带大小。 可选的, 所述子带大小集合可以包括多个相同或者不同的子带大小。 所述 子带大小配置索引用于指示所述子带大小集合中的一个子带大小。所述子带大 小集合中中的每一个子带大小均存在一个子带大小配置索引与之对应。需要进 一步指出的是, 所述子带大小集合可以包含多个子带大小相同的值。
可选的,所述子带大小集合或者子带大小配置索引与所述子带大小集合中 的各个子带大小之间的映射或对应关系可以是预定义的 (predefined ), 为 UE 与基站所共知。 例如, 与不同的子带大小配置索引对应的子带大小可以如表 1 所示。 大小集合中得到子带大小。此外, 所述子带大小与也可以是预定义的子带大小 配置索引的函数。
进一步地, 所述子带大小集合可以是一个小区特定的( cell specific )子带 大小集合。
可选地, 发送单元 41还可以用于向所述 UE发送小区特定的子带大小配 置索引,所述小区特定的子带大小集合根据所述小区特定的子带大小配置索引 确定的。
可选地,所述小区特定的子带大小集合由基站通知的小区特定的子带大小 配置索引所指示。 具体地, 与小区特定的子带大小配置索引对应的小区特定的 子带大小集合, 可以如表 2所示。
可选地,所述小区特定的子带大小配置索引也可以是小区类型或者根据小 区标识(cell lD )得到。
可选的,所述带大小集合配置信息还可以包括小区特定的子带大小配置索 引;以上所述小区特定的子带大小集合根据所述小区特定的子带大小配置索引 确定。
可选地, 作为另一实施例, 所述子带大小还可以是根据所述 UE特定的子 带大小配置索引,从小区特定的子带大小集合中确定, 其中所述小区特定的子 带集合根据所述小区特定的子带大小配置索引确定。或者所述子带大小还可以 是根据所述小区特定的子带大小配置索引和 UE特定的子带大小配置索引,从 子带大小集合中确定。 具体地,可以先根据小区特定的子带大小配置索引确定小区特定的子带大 小集合,再根据 UE特定的子带大小配置索引从所述小区特定的子带大小集合 中确定一个子带大小。还可以是根据所述小区特定的子带大小配置索引和所述 UE特定的子带大小配置索引一起从子带大小集合中确定一个子带大小。 如表 2表示, 当上述小区特定的子带大小配置索引为 2且上述 UE特定的子带大小 配置索引为 3, 直接可以确定子带大小为 8B的子带大小。 具体还可以是根据 所述 UE特定的子带大小配置索引确定多个子带大小(属于不同的小区特定的 子带大小集合),再根据所述小区特定的子带大小配置索引确定一个子带大小, 即得到小区特定的子带大小集合包括的根据所述 UE特定的子带大小配置索引 确定的子带大小。如表 2表示, 当上述小区特定的子带大小配置索引为 0且上 述 UE特定的子带大小配置索引为 1, 可以先根据上述 UE特定的子带大小配 置索引 1确定子带大小 2B、 4B、 2B和 4B, 再根据小区特定的子带大小配置 索引 0确定子带大小集合 0, 从而确定子带大小集合 0包括的子带大小 2B。
本实施例中, 所述基站通过小区特定的子带大小配置索引和 UE特定的 ( UE specific )子带大小配置索引,配置所述 UECSI反馈使用的子带大小从小 区特定的子带大小集合中得到, 从而使得 UE能够基于不同的小区环境(例如 宏小区和微小区中不同的无线传播特性), 得到所述 UE特定的子带大小, 计 算并反馈 CSI。 从而, 所述 UE特定的子带大小配置使得所述用户能够根据系 统配置自适应不同的传播环境特别是不同的小区环境中的无线传播特性,特别 是自适应 UE与基站之间信道的相干带宽 (coherence bandwidth)的变化, 提高 CSI反馈的精度, 从而提高系统性能。
可选地, 作为另一实施例, 接收单元 42接收的 CSI, 可以包括信道质量 指示 CQI和预编码矩阵指示 PMI或者秩指示 RI。
其中, 预编码矩阵指示 PMI或者秩指示 RI所对应的子带大小可以是信道 质量指示 CQI所对应的子带大小的 N倍。 另外, 预编码矩阵指示 PMI所对应 的子带大小可以理解为 PMI使用的子带大小, RI所对应的子带大小可以理解 为 RI使用的子带大小, CQI所对应的子带大小可以理解为 CQI使用的子带大 小; 其中, 所述 CQI使用的子带大小为所述子带大小配置索引确定的子带大 小。 N为大于等于 1的整数。 N的具体取值可以根据 UE的传输模式或者 CSI 报告模式确定。
由于信道质量指示 CQI通常用于调度和用户配对, CQI比 PMI或者 RI 具有更强的频率选择性。 CQI所对应的子带大小是预编码矩阵指示 PMI或者 秩指示 RI所对应的子带大小的 1/N, 更有利于实现频率选择性调度, 从而提 高提供的吞吐量。
本实施例中, 基站通过 UE特定的 (UE specific )子带大小配置索引, 配 置所述 UECSI反馈使用 UE特定的的子带大小,从而使得 UE能够基于不同的 无线传播特性, 得到所述 UE特定的子带大小, 计算并反馈 CSI。 其中, 预编 码矩阵指示 PMI或者秩指示 RI所对应的子带大小是信道质量指示 CQI所对应 的子带大小的整数倍。从而所述 UE特定的子带大小配置使得所述用户能够根 据系统配置自适应不同的频率选择性,特别是自适应 UE与基站之间信道的相 干带宽 (coherence bandwidth)的变化, 提高 CSI反馈的精度, 从而提高系统性 能。 图 5是本发明实施例提供的一种用户设备的结构示意图, 如图 5所示, 包 括: 接收器 51和发射器 52, 以及分别与所述接收器 51和发射器 52连接的处 理器 53, 其中:
所述接收器 51, 用于接收基站发送的子带大小配置信息, 所述子带大小 配置信息包括 UE特定的子带大小配置索引;
所述处理器 53, 用于根据所述 UE特定的子带大小配置索引确定子带大 小;
所述处理器 53还用于确定 CSI, 其中, 所述 CSI反映至少一个子带上的 传输, 所述子带是根据所述子带大小确定的;
所述发射器 52, 用于向所述基站发送所述 CSI。
可选的, 处理器 52可以用于根据所述 UE特定的子带大小配置索引, 从 子带大小集合中确定一个子带大小。
可选的, 所述子带大小集合可以是小区特定的子带大小集合。
可选的, 接收器 51还可以用于接收所述基站发送的小区特定的子带大小 配置索引,所述小区特定的子带大小集合根据所述小区特定的子带大小配置索 引确定的。 这样处理器 52就可以才艮据所述小区特定的子带大小配置索引确定 所述小区特定的子带大小。
可选的, 所述 CSI可以包括信道质量指示 CQI和预编码矩阵指示 PMI, 所述 PMI使用的子带大小为所述 CQI使用的子带大小的 N倍, 其中, 所述 CQI使用的子带大小为所述子带大小配置索引确定的子带大小, 所述 N为正 整数。
本实施例中的子带大小是根据 UE特定的 (UE specific )子带大小配置索 引得到的, 从而使得 UE能够基于所述 UE特定的子带大小计算并反馈 CSI。 这样可以实现 CSI反映的子带的大带大小是由基站指定的 UE特定的子带大 小, 这样该子带大小可以更好地适应该 UE的环境, 从而可以提高通信系统的 性能。 另外, 所述 UE特定的子带大小配置使得所述用户能够根据系统配置自 适应不同的传播环境,特别是自适应 UE与基站之间信道的相干带宽 (coherence bandwidth)的变化。 另外, 由于 CSI的子带大小是 UE特定的子带大小, 这样 就可以提高 CSI反馈的精度, 从而提高系统性能。 图 6是本发明实施例提供的一种基站的结构示意图, 如图 6所示, 包括: 发射器 61和接收器 62, 其中:
发射器 61,用于向 UE发送子带大小配置信息,所述子带大小配置信息包 括 UE特定的子带大小配置索引;
所述接收器 62, 用于接收所述 UE发送的 CSI, 其中, 所述 CSI反映至少 一个子带上的传输, 所述子带是根据子带大小确定的, 所述子带大小是根据所 述 UE特定的子带大小配置索引确定。
可选的, 上述基站还可以包括:
处理器 63,用于根据所述 UE特定的子带大小配置索引从子带大小集合中 确定所述子带大小。
可选的, 所述子带大小集合可以是小区特定的子带大小集合。
可选的, 发射器 62还可以用于向所述 UE发送小区特定的子带大小配置 索引,这样可以实现所述小区特定的子带大小集合根据所述小区特定的子带大 小配置索引确定的。 可选的, 所述 CSI包括信道质量指示 CQI和预编码矩阵指示 PMI, 所述 PMI使用的子带大小为所述 CQI使用的子带大小的 N倍, 其中, 所述 CQI使 用的子带大小为所述子带大小配置索引确定的子带大小, 所述 N为正整数。
本实施例中, 基站向 UE发送 UE特定的子带大小配置索引, 从而使得 UE 能够基于所述 UE特定的子带大小配置索引对应的子带大小计算并反馈 CSI。 这样可以实现 CSI反映的子带的大带大小是由基站指定的 UE特定的子 带大小, 这样该子带大小可以更好地适应该 UE的环境, 从而可以提高通信系 统的性能。另外,可以实现 CSI反映的子带的大带大小是由基站指定的,从而, 基站可以使得所述用户能够根据系统配置自适应不同的传播环境,特别是自适 应 UE与基站之间信道的相干带宽 (coherence bandwidth)的变化。 另夕卜, 由于 CSI的子带大小是 UE特定的子带大小, 这样就可以提高 CSI反馈的精度, 从 而提高系统性能。
本领域普通技术人员可以理解实现上述实施例方法中的全部或部分流程, 是可以通过计算机程序来指令相关的硬件来完成,所述的程序可存储于一计算 机可读取存储介质中,该程序在执行时,可包括如上述各方法的实施例的流程。 其中,所述的存储介质可为磁碟、光盘、只读存储记忆体(Read-Only Memory, ROM )或随机存取存储器(Random Access Memory, 简称 RAM )等。
以上所揭露的仅为本发明较佳实施例而已,当然不能以此来限定本发明之 权利范围,因此依本发明权利要求所作的等同变化,仍属本发明所涵盖的范围。

Claims

权 利 要 求
1、 一种信道状态信息 CSI报告方法, 其特征在于, 包括:
接收基站发送的子带大小配置信息,所述子带大小配置信息包括用户设备 特定的子带大小配置索引;
根据所述用户设备特定的子带大小配置索引确定子带大小;
确定 CSI, 其中, 所述 CSI反映至少一个子带上的传输, 所述子带是根据 所述子带大小确定的;
向所述基站发送所述 CSI。
2、 如权利要求 1所述的方法, 其特征在于, 所述根据所述用户设备特定 的子带大小配置索引确定子带大小, 包括:
根据所述用户设备特定的子带大小配置索引,从子带大小集合中确定一个 子带大小。
3、 如权利要求 2所述的方法, 其特征在于, 所述子带大小集合是小区特 定的子带大小集合。
4、 如权利要求 3所述的方法, 其特征在于, 所述方法还包括:
接收所述基站发送的小区特定的子带大小配置索引,所述小区特定的子带 大小集合根据所述小区特定的子带大小配置索引确定的。
5、 如权利要求 1至 4任一项所述的方法, 其特征在于, 所述 CSI包括信 道质量指示 CQI和预编码矩阵指示 PMI,所述 PMI使用的子带大小为所述 CQI 使用的子带大小的 N倍, 其中, 所述 CQI使用的子带大小为所述子带大小配 置索引确定的子带大小, 所述 N为正整数。
6、 一种 CSI报告方法, 其特征在于, 包括:
向用户设备发送子带大小配置信息,所述子带大小配置信息包括用户设备 特定的子带大小配置索引;
接收所述用户设备发送的 CSI, 其中, 所述 CSI反映至少一个子带上的传 输, 所述子带是根据子带大小确定的, 所述子带大小是根据所述用户设备特定 的子带大小配置索引确定。
7、 如权利要求 6所述的方法, 其特征在于, 所述方法还包括:
根据所述用户设备特定的子带大小配置索引,从子带大小集合中确定所述 子带大小。
8、 如权利要求 7所述的方法, 其特征在于, 所述子带大小集合是小区特 定的子带大小集合。
9、 如权利要求 8所述的方法, 其特征在于, 所述方法还包括:
向所述用户设备发送小区特定的子带大小配置索引,所述小区特定的子带 大小集合根据所述小区特定的子带大小配置索引确定的。
10、如权利要求 6至 9任一项所述的方法, 其特征在于, 所述 CSI包括信 道质量指示 CQI和预编码矩阵指示 PMI,所述 PMI使用的子带大小为所述 CQI 使用的子带大小的 N倍, 其中, 所述 CQI使用的子带大小为所述子带大小配 置索引确定的子带大小, 所述 N为正整数。
11、 一种用户设备, 其特征在于, 包括: 接收单元、 确定单元、 计算单元 和发送单元, 其中:
所述接收单元, 用于接收基站发送的子带大小配置信息, 所述子带大小配 置信息包括用户设备特定的子带大小配置索引;
所述确定单元,用于根据所述用户设备特定的子带大小配置索引确定子带 大小;
所述计算单元, 用于确定信道状态信息 CSI, 其中, 所述 CSI反映至少一 个子带上的传输, 所述子带是根据所述子带大小确定的;
所述发送单元, 用于向所述基站发送所述 CSI。
12、 如权利要求 11所述的用户设备, 其特征在于, 所述确定单元具体用 于根据所述用户设备特定的子带大小配置索引,从子带大小集合中确定一个子 带大小。
13、 如权利要求 12所述的用户设备, 其特征在于, 所述子带大小集合是 从小区特定的子带大小集合。
14、 如权利要求 13所述的用户设备, 其特征在于, 所述接收单元还用于 接收所述基站发送的小区特定的子带大小配置索引;
所述确定单元还用于根据所述小区特定的子带大小配置索引信息确定所 述小区特定的子带大小集合。
15、 如权利要求 11至 14任一项所述的用户设备, 其特征在于, 所述 CSI 包括信道质量指示 CQI和预编码矩阵指示 PMI, 所述 PMI使用的子带大小为 所述 CQI使用的子带大小的 N倍, 其中, 所述 CQI使用的子带大小为所述子 带大小配置索引确定的子带大小, 所述 N为正整数。
16、 一种基站, 其特征在于, 包括: 发送单元和接收单元, 其中: 所述发送单元, 用于向用户设备发送子带大小配置信息, 所述子带大小配 置信息包括用户设备特定的子带大小配置索引;
所述接收单元, 用于接收所述用户设备发送的信道状态信息 CSI, 其中, 所述 CSI反映至少一个子带上的传输, 所述子带是根据子带大小确定的,所述 子带大小根据所述用户设备特定的子带大小配置索引确定。
17、 如权利要求 16所述的基站, 其特征在于, 所述装置还包括: 确定单元, 用于根据所述用户设备特定的子带大小配置索引,从子带大小 集合中确定所述子带大小。
18、 如权利要求 17所述的基站, 其特征在于, 所述子带大小集合是小区 特定的子带大小集合。
19、 如权利要求 18所述的基站, 其特征在于, 所述发送单元还用于向所 述用户设备发送小区特定的子带大小配置索引,所述小区特定的子带大小集合 才艮据所述小区特定的子带大小配置索引确定的。
20、如权利要求 16至 19任一项所述的基站, 其特征在于, 所述 CSI包括 信道质量指示 CQI和预编码矩阵指示 PMI, 所述 PMI使用的子带大小为所述 CQI使用的子带大小的 N倍, 其中, 所述 CQI使用的子带大小为所述子带大 小配置索引确定的子带大小, 所述 N为正整数。
21 一种用户设备, 其特征在于, 包括: 接收器和发射器, 以及分别与所 述接收器和发射器连接的处理器, 其中:
所述接收器, 用于接收基站发送的子带大小配置信息, 所述子带大小配置 信息包括用户设备特定的子带大小配置索引;
所述处理器,用于根据所述用户设备特定的子带大小配置索引确定子带大 小;
所述处理器还用于确定信道状态信息 CSI, 其中, 所述 CSI反映至少一个 子带上的传输, 所述子带是根据所述子带大小确定的; 所述发射器, 用于向所述基站发送所述 CSI。
22、 如权利要求 21所述的用户设备, 其特征在于, 所述处理器用于根据 所述用户设备特定的子带大小配置索引, 从子带大小集合中确定一个子带大 小。
23、 如权利要求 22所述的用户设备, 其特征在于, 所述子带大小集合是 小区特定的子带大小集合。
24、 如权利要求 3所述的用户设备, 其特征在于, 所述接收器还用于接收 所述基站发送的小区特定的子带大小配置索引,所述小区特定的子带大小集合 才艮据所述小区特定的子带大小配置索引确定的。
25、 如权利要求 21至 24任一项所述的用户设备, 其特征在于, 所述 CSI 包括信道质量指示 CQI和预编码矩阵指示 PMI, 所述 PMI使用的子带大小为 所述 CQI使用的子带大小的 N倍, 其中, 所述 CQI使用的子带大小为所述子 带大小配置索引确定的子带大小, 所述 N为正整数。
26、 一种基站, 其特征在于, 包括: 发射器和接收器, 其中:
所述发射器, 用于向用户设备发送子带大小配置信息, 所述子带大小配置 信息包括用户设备特定的子带大小配置索引;
所述接收器, 用于接收所述用户设备发送的信道状态信息 CSI, 其中, 所 述 CSI反映至少一个子带上的传输,所述子带是根据子带大小确定的,所述子 带大小是根据所述用户设备特定的子带大小配置索引确定。
27、 如权利要求 26所述的基站, 其特征在于, 所述基站还包括: 处理器, 用于根据所述用户设备特定的子带大小配置索引,从子带大小集 合中确定所述子带大小。
28、 如权利要求 27所述的基站, 其特征在于, 所述子带大小集合是小区 特定的子带大小集合。
29、 如权利要求 28所述的基站, 其特征在于, 所述发射器还用于向所述 用户设备发送小区特定的子带大小配置索引,所述小区特定的子带大小集合根 据所述小区特定的子带大小配置索引确定的。
30、如权利要求 26至 29任一项所述的基站, 其特征在于, 所述 CSI包括 信道质量指示 CQI和预编码矩阵指示 PMI, 所述 PMI使用的子带大小为所述 CQI使用的子带大小的 N倍, 其中, 所述 CQI使用的子带大小为所述子带大 小配置索引确定的子带大小, 所述 N为正整数。
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