WO2015149333A1 - 一种csi报告方法和设备 - Google Patents
一种csi报告方法和设备 Download PDFInfo
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- 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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- subband size
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- 238000000034 method Methods 0.000 title claims abstract description 50
- 230000005540 biological transmission Effects 0.000 claims abstract description 26
- 239000011159 matrix material Substances 0.000 claims description 33
- 238000004891 communication Methods 0.000 abstract description 16
- 230000001427 coherent effect Effects 0.000 description 23
- 230000003044 adaptive effect Effects 0.000 description 14
- 238000010586 diagram Methods 0.000 description 8
- 230000011664 signaling Effects 0.000 description 8
- 230000006870 function Effects 0.000 description 7
- 238000013507 mapping Methods 0.000 description 6
- 238000005259 measurement Methods 0.000 description 2
- 238000010295 mobile communication Methods 0.000 description 2
- 230000006978 adaptation Effects 0.000 description 1
- 230000001413 cellular effect Effects 0.000 description 1
- 238000004590 computer program Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
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Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/20—Control channels or signalling for resource management
- H04W72/21—Control channels or signalling for resource management in the uplink direction of a wireless link, i.e. towards the network
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
- H04B7/0613—Diversity 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
- H04B7/0615—Diversity 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
- H04B7/0619—Diversity 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
- H04B7/0621—Feedback content
- H04B7/0632—Channel quality parameters, e.g. channel quality indicator [CQI]
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
- H04B7/0613—Diversity 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
- H04B7/0615—Diversity 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
- H04B7/0619—Diversity 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
- H04B7/0636—Feedback format
- H04B7/0639—Using selective indices, e.g. of a codebook, e.g. pre-distortion matrix index [PMI] or for beam selection
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
- H04B7/0613—Diversity 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
- H04B7/0615—Diversity 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
- H04B7/0619—Diversity 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
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- H04B7/0645—Variable feedback
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- H—ELECTRICITY
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- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
- H04B7/0613—Diversity 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
- H04B7/0615—Diversity 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
- H04B7/0619—Diversity 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
- H04B7/0658—Feedback reduction
- H04B7/066—Combined feedback for a number of channels, e.g. over several subcarriers like in orthogonal frequency division multiplexing [OFDM]
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
- H04L1/0023—Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the signalling
- H04L1/0026—Transmission of channel quality indication
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
- H04L1/0023—Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the signalling
- H04L1/0028—Formatting
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/003—Arrangements for allocating sub-channels of the transmission path
- H04L5/0053—Allocation of signaling, i.e. of overhead other than pilot signals
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/003—Arrangements for allocating sub-channels of the transmission path
- H04L5/0053—Allocation of signaling, i.e. of overhead other than pilot signals
- H04L5/0057—Physical resource allocation for CQI
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/50—Allocation or scheduling criteria for wireless resources
- H04W72/51—Allocation 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
Description
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CN201480000554.XA CN105229955A (zh) | 2014-04-03 | 2014-04-03 | 一种csi报告方法和设备 |
EP14888365.5A EP3116155A4 (en) | 2014-04-03 | 2014-04-03 | Csi report method and equipment |
KR1020167030377A KR20160138563A (ko) | 2014-04-03 | 2014-04-03 | Csi 보고 방법 및 기기 |
PCT/CN2014/074740 WO2015149333A1 (zh) | 2014-04-03 | 2014-04-03 | 一种csi报告方法和设备 |
US15/282,651 US20170026953A1 (en) | 2014-04-03 | 2016-09-30 | Csi reporting method and device |
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Cited By (3)
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US10511411B2 (en) | 2018-01-12 | 2019-12-17 | Huawei Technologies Co., Ltd. | Method for configuring channel state information reporting band and communications apparatus |
US11239950B2 (en) | 2018-01-12 | 2022-02-01 | Huawei Technologies Co., Ltd. | Method for configuring channel state information reporting band and communications apparatus |
WO2024094045A1 (zh) * | 2022-11-04 | 2024-05-10 | 中国移动通信有限公司研究院 | 信息上报的方法及装置、终端及网络侧设备 |
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US9801087B2 (en) * | 2012-03-08 | 2017-10-24 | Lg Electronics Inc. | Method and apparatus for transmitting information for reporting in wireless communication system |
CN117134867A (zh) * | 2016-11-02 | 2023-11-28 | 交互数字专利控股公司 | 接收机带宽适配 |
CN108023619B (zh) * | 2016-11-03 | 2023-09-01 | 华为技术有限公司 | 一种预编码配置方法、设备及系统 |
US10749584B2 (en) * | 2016-12-22 | 2020-08-18 | Samsung Electronics Co., Ltd. | Uplink MIMO codebook for advanced wireless communication systems |
EP3547589B1 (en) * | 2018-03-28 | 2022-02-09 | Institut Mines-Telecom | Method and system for user distribution to sub-bands in multiple access communications systems |
KR102640707B1 (ko) * | 2018-04-30 | 2024-02-27 | 삼성전자주식회사 | 빔 편향기, 이를 포함한 홀로그래픽 디스플레이 장치 및 빔 편향기 구동 방법 |
CN111278005B (zh) * | 2019-01-22 | 2021-09-24 | 维沃移动通信有限公司 | 能力信息上报方法、预编码矩阵指示反馈方法和相关设备 |
CN111082841A (zh) * | 2019-08-14 | 2020-04-28 | 中兴通讯股份有限公司 | 信道状态信息的处理、接收方法及装置 |
CN115152166A (zh) * | 2019-11-18 | 2022-10-04 | 高通股份有限公司 | 信道状态信息反馈压缩 |
US20230361842A1 (en) * | 2020-03-06 | 2023-11-09 | Nokia Technologies Oy | Improving precoding |
CN117081635A (zh) * | 2020-10-02 | 2023-11-17 | 苹果公司 | 信道状态信息报告 |
WO2023196421A1 (en) * | 2022-04-05 | 2023-10-12 | Interdigital Patent Holdings, Inc. | Methods and apparatus for wtru-specific channel state information codebook design |
WO2023216166A1 (zh) * | 2022-05-11 | 2023-11-16 | 北京小米移动软件有限公司 | 相干带宽的测量方法和装置 |
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- 2014-04-03 EP EP14888365.5A patent/EP3116155A4/en not_active Withdrawn
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- 2014-04-03 WO PCT/CN2014/074740 patent/WO2015149333A1/zh active Application Filing
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US20170026953A1 (en) | 2017-01-26 |
EP3116155A4 (en) | 2017-03-22 |
CN105229955A (zh) | 2016-01-06 |
KR20160138563A (ko) | 2016-12-05 |
EP3116155A1 (en) | 2017-01-11 |
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