WO2017198142A1 - Procédé de détermination de cqi, équipement utilisateur et station de base - Google Patents

Procédé de détermination de cqi, équipement utilisateur et station de base Download PDF

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Publication number
WO2017198142A1
WO2017198142A1 PCT/CN2017/084525 CN2017084525W WO2017198142A1 WO 2017198142 A1 WO2017198142 A1 WO 2017198142A1 CN 2017084525 W CN2017084525 W CN 2017084525W WO 2017198142 A1 WO2017198142 A1 WO 2017198142A1
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Prior art keywords
csi
interference
resource
coordinated cell
coordinated
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PCT/CN2017/084525
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English (en)
Chinese (zh)
Inventor
姚赛杰
任海豹
李元杰
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华为技术有限公司
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Publication of WO2017198142A1 publication Critical patent/WO2017198142A1/fr

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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
    • 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
    • H04L5/0048—Allocation of pilot signals, i.e. of signals known to the receiver
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B17/00—Monitoring; Testing
    • H04B17/30—Monitoring; Testing of propagation channels
    • H04B17/309—Measuring or estimating channel quality parameters
    • 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
    • H04B7/022—Site diversity; Macro-diversity
    • H04B7/024—Co-operative use of antennas of several sites, e.g. in co-ordinated multipoint or co-operative multiple-input multiple-output [MIMO] systems
    • 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
    • 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

Definitions

  • the embodiments of the present invention relate to the field of communications, and in particular, to a CQI determining method, a user equipment, and a base station.
  • the neighboring cells are usually configured to be the same frequency band, but the neighboring cells use the same frequency band to make the neighboring cells Interference occurs between them, so that the throughput of user equipment located at the edge of the neighboring cell drops sharply.
  • inter-cell interference becomes more and more serious and becomes a decisive factor affecting the network capacity of the system.
  • the CoMP (Coordinated Multipoint Transmission) technology can further improve the throughput, frequency utilization efficiency, and capacity of the entire LTE network of neighboring cell edge UEs in the LTE network.
  • the CoMP technology is based on the sharing of the channel state information (CSI, channel state information) and the user data information of each coordinated base station, and the interference of the neighboring cell is converted into useful information through the cooperation of the inter-cell base stations, and the core of the CoMP technology.
  • the idea is to simultaneously serve one UE or multiple UEs through multiple transmission points with spatial location adjacency, thereby dynamically cooperating between multiple geographically separated base stations, reducing inter-cell interference and improving cell edge UE throughput. And system throughput.
  • the CoMP technology includes downlink transmission CoMP and uplink reception CoMP.
  • the downlink transmission CoMP mainly includes JT (Joint Transmission), cooperative scheduling, CS/CB (Coordinated Scheduling and Beamforming), and DPS/DPB (Dynamic). Dynamic Point Selection/Dynamic Point Blanking), where JT is divided into coherent JT and non-coherent JT.
  • Uplink CoMP technologies include Joint Reception (JR, Joint Reception), CS, and DPS/DPB.
  • CoMP technology is mainly focused on outdoor deployment scenarios, and indoor deployment scenarios have not yet been applied.
  • the amount of scene data traffic for indoor deployment is usually very large, and the RF isolation between cooperative base stations is usually very poor.
  • the interference between different cooperative base stations in the above indoor deployment scenario may result in a very poor Signal to Interference and Noise Ratio (SINR) value.
  • SINR Signal to Interference and Noise Ratio
  • the base station can select an appropriate resource for the UE by using a CQI (Channel Quality Indicator) value that is fed back by the UE, and modulate the coding mode and the transmission mode, so as to reduce interference between different coordinated base stations, and improve the information.
  • CQI Channel Quality Indicator
  • the UE usually utilizes NZP (Non-zero Power) CSI-RS (Channel State Information Reference Signal, Channel State) Information-Reference Signal measures CSI (Channel State Information) and measures interference information using IMR (Interference Measurement Resource).
  • NZP Non-zero Power
  • CSI-RS Channel State Information Reference Signal
  • IMR Interference Measurement Resource
  • the UE calculates and quantizes the measured CSI and the interference information into a PMI (Recoding Matrix Indicator), a Rank Indication (RI), and a CQI, and feeds back to the base station to which the coordinated cell belongs, so that the serving cell belongs to The base station selects an appropriate resource according to the CQI value fed back by the UE side.
  • PMI Recoding Matrix Indicator
  • RI Rank Indication
  • CQI Cost/CQI
  • one CSI-RS resource and one CSI-IM resource of the same CSI process are all configured in one subframe, so the UE only has a small amount of interference hypothesis when measuring interference information. For example, when the number of cells in the collaboration set is three, the above configuration can only report four possible CQIs at the same time. The UE will obtain different CQI values due to different interference assumptions.
  • the IMR When the coordinated cell has interference information of any coordinated cell, the IMR is configured for the any coordinated cell, and the coordinated cell does not send data on the IMR, and the remaining coordinated cells send data on the IMR, but when the number of coordinated cells is large In this case, it is difficult to meet the requirements, and the above-mentioned large-scale indoor deployment scenario cannot be well solved.
  • different interference assumptions lead to a large increase in the overhead of interference measurement resources.
  • the embodiment of the present invention provides a CQI determining method, a user equipment, and a base station, which are used to solve the problem that the overhead of using the IMR measurement interference increases greatly as the coordinated cell increases in the prior art when the number of coordinated cells is large.
  • an embodiment of the present invention provides a method for determining a CQI, including: acquiring, by a user equipment, a channel state information reference signal CSI-RS resource configured by each coordinated cell in the cooperation set and at least one channel state information interference measurement CSI-IM resource.
  • the user equipment calculates interference information of each coordinated cell under at least one interference combination according to the CSI-RS resources configured by each coordinated cell, where the interference combination is in the at least one CSI-IM resource.
  • Arbitrarily combining; the user equipment determines, according to the interference information of each coordinated cell under the at least one interference combination and the downlink channel information of each coordinated cell, each of the interferences of each coordinated cell in the interference combination
  • the channel quality under combination indicates CQI.
  • the embodiment of the present invention provides a method for determining a CQI, by using one CSI-RS resource and at least one CSI-IM resource configured for each coordinated cell by the base station in the same process, so that the user equipment can cooperate according to any one in the collaboration set.
  • the combination of one CSI-IM resource of the cell configuration and the CSI-IM resource configured by at least one coordinated cell in the cooperation set determines interference information of each coordinated cell under each interference combination, and according to at least one of each coordinated cell Determining interference information under the interference combination and downlink channel information of each coordinated cell, determining a channel quality indicator CQI of each of the interference combinations in each of the interference combinations in at least one of the interference combinations, as measured in the prior art
  • the same CSI process CSI-RS resource and CSI-IM resource are all configured in one subframe, so that when the number of coordinated cells is relatively large, the overhead of using CSI-IM resources to measure interference increases greatly with the increase of the coordinated cell.
  • the embodiment of the present invention configures one CSI-RS resource and at least one CSI-IM resource for each coordinated cell in the same process, and according to the interference. Calculating interference engagement multiplexing CSI-RS resource information to determine a CQI, CSI-IM can save costs of resources when the number of cooperative cells is relatively large.
  • each of the coordinated cells The CSI-RS resource is a pre-coded CSI-RS resource, and the pre-coded CSI-RS resource is consistent with a beam direction of the coordinated cell in the next scheduling period.
  • the CQI measured by the user equipment is based on the CSI-RS of the next scheduling period, which improves the measurement accuracy of the CQI.
  • the first coordinated cell is any one of all coordinated cells in the coordinated set, and the user equipment is configured according to the first collaboration.
  • the CSI-RS resource configured by the cell the interference information of the first coordinated cell in the at least one interference combination is calculated, and the user equipment calculates the CSI-RS resource configured according to the first coordinated cell, and calculates the first collaboration in the collaboration set.
  • the method further includes: determining, by the user equipment, the CSI-RS resources configured by each coordinated cell, Downstream channel information.
  • the user equipment calculates, by the user equipment, interference power of the other coordinated cell to the first coordinated cell, including: Determining a collaboration set according to the downlink channel information of the first coordinated cell, the CSI-RS resource sent by the first coordinated cell on the first time-frequency resource, and the first reference signal received by the user equipment on the first time-frequency resource Interference information of the other coordinated cell to the other coordinated cell. This can improve the measurement accuracy of CQI.
  • the user equipment determines, according to the interference information of each coordinated cell in the at least one type of the interference combination, and the downlink channel information of each coordinated cell.
  • the method includes: the user equipment acquires the power of each coordinated cell in the coordinated set to send data in the next scheduling period; A power difference exists between the power of the fourth coordinated cell and the reference signal power of the fourth coordinated cell, and the user equipment adjusts the reference signal power of the fourth coordinated cell; the user equipment adjusts the adjusted fourth coordinated cell.
  • the reference signal power is determined as the interference power of the fourth coordinated cell to the remaining coordinated cells except the fourth coordinated cell in the cooperation set.
  • the accurate CQI is based on the CSI-RS of the next scheduling period, by adjusting the power of the data transmitted by each coordinated cell and the next scheduling period, the interference information received by each coordinated cell can be accurately acquired, and the CQI is improved. measurement accuracy.
  • the method further includes: receiving, by the user equipment, the first indication information that is sent by the serving cell in the cooperation set; the first indication information is used to indicate that the user equipment measures at least An interference information under interference combination, where the first indication information includes at least one interference combination, where the interference combination includes one CSI-IM resource configured in any one of the coordinated cells in the cooperation set and at least one coordinated cell configuration in the cooperation set.
  • a combination of CSI-IM resources In this way, the base station only needs to indicate to the user equipment which CSI of the CSI-IM resource combination is specifically measured by the indication information, thereby reducing the overhead of the CSI-IM resource.
  • the user equipment acquires each coordinated cell in the collaboration set Before the configured channel state information reference signal CSI-RS resource and the at least one channel state information interfere with measuring the CSI-IM resource, the method further includes: acquiring, by the user equipment, the first CSI-RS resource and the at least one channel of each coordinated cell configuration in the cooperation set.
  • the state information interference measurement CSI-IM resource where the first CSI-RS resource includes a CSI-RS signal pre-configured for a current scheduling period of each coordinated cell; wherein the CSI-RS configuration of the current scheduling period of different coordinated cells is pre-configured
  • the user equipment measures channel state information CSI of each of the coordinated cells according to the first CSI-RS resource;
  • the CSI of one coordinated cell includes a precoding matrix PMI and a rank indicator RI of the coordinated cell; Transmitting channel state information CSI of each of the coordinated cells to a serving cell in the cooperation set, so that each coordinated cell in the cooperation set separately
  • the base station acquires the CSI-RS each cooperating cell precoded channel state information of each cooperating cell, wherein the precoded CSI-RS transmission consistent with the cooperative beam direction data cells in the next scheduling period.
  • the one CSI-IM resource includes at least one resource element RE that belongs to the same CSI-IM resource.
  • the resource elements RE have the same identifier, and the identifiers of the resource elements RE belonging to different CSI-IM resources are different.
  • the method further includes: receiving, by the user equipment, second indication information sent by the serving cell in the cooperation set, the second indication The information includes a number of each CSI-IM resource, and the second indication information is used to indicate that the signal power on at least one resource element RE of the CSI-IM resources with the same number is averaged as the power of the CSI-IM resource. Since the power on each RE is different, the average power of each CSI-IM resource can be obtained more accurately.
  • the method further includes: sending, to the serving cell in the collaboration set, each coordinated cell in at least one The channel quality indication CQI under each of the interference combinations in the interference combination.
  • the base station can acquire each coordinated small CQI under each of the CSI-IM resources in time, and select corresponding suitable resources for the user equipment according to the CQI of each coordinated CSI-IM resource.
  • the embodiment of the present invention further provides a method for determining a CQI, including: configuring a channel state information reference signal CSI-RS resource and at least one channel state information interference measurement CSI-IM resource for each coordinated cell in the cooperation set;
  • the first indication information is used to indicate that the user equipment measures interference information in at least one interference combination, where the first indication information includes at least one interference combination, and the interference combination is the at least one CSI-IM resource. Any combination of the received channel quality indicator CQIs of each of the interference combinations in each of the interference combinations in the at least one of the interference combinations sent by the user equipment.
  • the method further includes: second indication information that is sent to the user equipment, where the second indication information includes a number of each CSI-IM resource, The second indication information is used to indicate that the user equipment averages the signal power on the at least one resource element RE of the CSI-IM resources with the same number as the power of the CSI-IM resource.
  • the method further includes:
  • CSI of each of the coordinated cells sent by the user equipment where CSI of one coordinated cell includes a precoding matrix PMI and a rank indicator RI of the coordinated cell; and each CSI is acquired according to the coordinated cell Pre-coded CSI-RS corresponding to the coordinated cells; wherein one collaboration is small
  • the pre-coded CSI-RS of the area is consistent with the beam direction of the coordinated cell in the next scheduling period; and the corresponding CSI-RS of each of the coordinated cells is configured for each of the coordinated cells.
  • precoding the CSI-RS so that the user equipment calculates interference information of each coordinated cell under the at least one interference combination according to the pre-coded CSI-RS corresponding to each of the coordinated cell configurations.
  • an embodiment of the present invention provides a user equipment, including:
  • An acquiring unit configured to acquire a channel state information reference signal CSI-RS resource and at least one channel state information interference measurement CSI-IM resource configured by each coordinated cell in the cooperation set; and a calculating unit, configured to perform CSI according to each coordinated cell configuration - RS resources, calculating interference information of each coordinated cell under at least one interference combination; wherein the interference combination is any combination of the at least one CSI-IM resource; and the first determining unit is configured to And determining, by the coordinated cell, interference information under the at least one interference combination and downlink channel information of each coordinated cell, a channel quality indicator CQI of each of the interference combinations in each of the interference combinations.
  • the CSI-RS resource configured by each coordinated cell is a pre-coded CSI-RS resource, and the pre-coded CSI-RS resource and the The direction of the beam in which the coordinated cell transmits data in the next scheduling period is the same.
  • the first coordinated cell is any one of the coordinated cells in the coordinated set
  • the calculating unit includes: a calculation module, configured to calculate, according to a CSI-RS resource configured by the first coordinated cell, a remaining coordinated cell except the first coordinated cell in the collaboration set, and the at least one type of the interference combination An interference power of a coordinated cell; a second calculating module, configured to calculate interference power of the other cell other than the cooperation set to the first coordinated cell; and a determining module, configured to divide the collaboration set by the Interference power of the first coordinated cell with the remaining coordinated cells of the coordinated cell under the at least one of the interference combinations, and interference power of the other cells outside the coordinated set to the first coordinated cell And determining interference information of the first coordinated cell under the at least one interference combination.
  • the user equipment further includes a second determining unit, where the second determining unit is specifically configured to: configure according to each coordinated cell
  • the CSI-RS resource determines the downlink channel information of each coordinated cell.
  • the second calculating module is specifically configured to: according to the downlink channel information of the first coordinated cell, the first collaboration The CSI-RS resource sent by the cell on the first time-frequency resource and the first reference signal received by the user equipment on the first time-frequency resource, and determining interference information of the other cell other than the cooperation set to the first coordinated cell .
  • the user equipment further includes an adjusting unit, where the adjusting unit is configured to: acquire, in a next scheduling period, each coordinated cell in the coordinated set sends data. If the power difference between the power of the fourth coordinated cell and the reference signal power of the fourth coordinated cell exists, the reference signal power of the fourth coordinated cell is adjusted; and the adjusted fourth cooperation is performed.
  • the reference signal power of the cell is determined as the interference power of the fourth coordinated cell to the remaining coordinated cells except the fourth coordinated cell in the cooperation set.
  • the user equipment further includes a first receiving unit, where the first receiving unit is configured to: receive, by the serving cell in the collaboration set, the first Indication
  • the first indication information is used to indicate that the user equipment measures interference information under at least one interference combination, where the first indication information includes at least one interference combination, and the interference combination includes any collaboration in the collaboration set. Any combination of CSI-IM resources of the cell configuration and any one of the CSI-IM resources of at least one coordinated cell configuration in the cooperation set.
  • the user equipment further includes a first acquiring unit, a measuring unit, in a seventh possible implementation manner of the third aspect, And a first sending unit, where the first acquiring unit is configured to: acquire a first CSI-RS resource and at least one CSI-IM resource configured by each coordinated cell in the cooperation set, the first CSI-RS
  • the resource includes a pre-configured CSI-RS signal of a current scheduling period of each coordinated cell; wherein the pre-configured CSI-RSs of the different scheduling cells of the different coordinated cells are configured in different CSI processes;
  • the measuring unit is configured to use, according to the first CSI - the RS resource is used to measure the channel state information CSI of each of the coordinated cells;
  • the CSI of one coordinated cell includes a precoding matrix PMI and a rank indicator RI of the coordinated cell;
  • the first sending unit is configured to be in the collaboration set
  • the serving cell sends the channel state information CSI of each of the coordinated cells, so that the base station to which each coordinated
  • one CSI-IM resource includes at least one resource element RE, and resource elements RE belonging to the same CSI-IM resource have the same The identifier of the resource element RE of the different CSI-IM resources is different, and the user equipment further includes a second receiving unit, where the second receiving unit is specifically configured to: receive the second sent by the serving cell in the collaboration set Instructing information, the second indication information includes a number of each CSI-IM resource, and the second indication information is used to indicate that signal power on at least one resource element RE of the same numbered CSI-IM resources is averaged The power of the CSI-IM resource.
  • the user equipment further includes a second sending unit, where the second sending unit is specifically configured to:
  • the serving cell transmits a channel quality indication CQI for each of the interference combinations of each of the coordinated cells in at least one of the interference combinations.
  • an embodiment of the present invention provides a base station, including: a configuration unit, configured to configure a channel state information reference signal CSI-RS resource and at least one channel state information interference measurement CSI-IM resource for each coordinated cell in the cooperation set.
  • a first sending unit configured to send the first indication information to the user equipment, where the first indication information is used to indicate that the user equipment measures interference information in the at least one interference combination, where the first indication information includes at least one And the interference combination is any combination of the at least one CSI-IM resource;
  • the first receiving unit is configured to receive, at the at least one type of interference, each coordinated cell in the collaboration set sent by the user equipment
  • the channel quality under each of the interference combinations in the combination indicates a CQI.
  • the first indication information includes a combination of each coordinated cell in the cooperation set under different CSI-IM resources.
  • the base station further includes: a second sending unit, second indication information that is sent to the user equipment, the second indication information Include a number of each CSI-IM resource, where the second indication information is used to indicate that the user equipment will have the same numbered CSI-IM
  • the signal power on at least one resource element RE in the resource is averaged as interference of the CSI-IM resource.
  • the configuring unit is further configured to: configure, for each coordinated cell in the collaboration set, first channel state information CSI-RS resources and At least one CSI-IM resource, such that the user equipment measures channel state information CSI of each of the coordinated cells according to the first CSI-RS resource.
  • the base station further includes: a second receiving unit, configured to receive a channel of each of the coordinated cells by using a serving cell in the coordinated set a CSI, where the CSI of one coordinated cell includes a precoding matrix PMI and a rank indicator RI of the coordinated cell, and an acquiring unit, configured to acquire, according to the CSI of each coordinated cell, a pre-corresponding to each of the coordinated cells.
  • the encoded CSI-RS wherein the pre-coded CSI-RS of one coordinated cell is consistent with the beam direction of the coordinated cell in the next scheduling period; and the third sending unit is configured to perform, according to each of the coordinated cells
  • the pre-coded CSI-RS configures a corresponding pre-coded CSI-RS for each of the coordinated cells, so that the user equipment calculates each of the corresponding pre-coded CSI-RSs according to each of the coordinated cell configurations.
  • an embodiment of the present invention provides a user equipment, including: a processor, a memory, a system bus, and a communication interface;
  • the memory is configured to store a computer execution instruction
  • the processor is connected to the memory through the system bus, and when the user equipment is running, the processor executes the computer execution instruction stored in the memory to The user equipment is caused to perform the CQI determination method as described in the above first aspect or any one of the optional aspects of the first aspect.
  • an embodiment of the present invention provides a readable medium, including computer execution instructions, when the processor of the user equipment executes the computer execution instruction, the user equipment performs any of the foregoing first aspect or the first aspect.
  • a CQI determination method as described in an alternative manner.
  • an embodiment of the present invention provides a base station, including: a processor, a memory, a system bus, and a communication interface;
  • the memory is configured to store a computer to execute instructions
  • the processor is coupled to the memory via the system bus, and when the base station is in operation, the processor executes the computer-executed instructions stored in the memory to enable The base station performs the CQI determination method as described in the second aspect or the second aspect of the second aspect.
  • an embodiment of the present invention provides a readable medium, including computer execution instructions, when the processor of a base station executes the computer to execute an instruction, the base station performs any one of the foregoing second aspect or the second aspect.
  • the embodiment of the present invention provides a communication system, where the communication system includes a plurality of user equipments and a base station, and the multiple user equipments may be in any one of the foregoing third aspect or the third aspect.
  • the user equipment, and the base station may be the base station described in the foregoing fourth aspect or any one of the optional aspects of the fourth aspect; or
  • the plurality of user equipments may be the user equipments of the foregoing fifth aspect, and the base station may be the base station according to the seventh aspect.
  • the foregoing user equipment may further include the readable medium according to the sixth aspect, where the base station is further The readable medium of the eighth aspect is included.
  • an embodiment of the present invention provides an apparatus, where the apparatus includes a processor and a memory, where the memory includes an instruction, when the instruction is executed, is optional according to any of the foregoing first aspect or the first aspect.
  • the method in the method, or the method in any of the foregoing second aspect or the second aspect, is implemented.
  • the base station may configure one CSI-RS resource and at least one CSI-IM resource for each coordinated cell in the same process, so that the user
  • the channel state information CSI under each CSI-IM resource may be calculated according to the one CSI-RS resource and the at least one CSI-IM resource, and may also interfere with one CSI-IM resource of any one of the coordinated cells indicated in the combination and at least
  • the combination between any one of the CSI-IM resources configured by one coordinated cell determines the channel quality indicator CQI of each coordinated cell under each interference combination in at least one interference combination, because the same CSI is measured when measuring CQI in the prior art.
  • the process CSI-RS resource and the CSI-IM resource are all configured in one subframe, so that when the number of coordinated cells is relatively large, the overhead of using CSI-IM resources to measure interference increases greatly as the coordinated cell increases, so the present invention implements
  • one CSI-RS resource and at least one CSI-IM resource are configured for each coordinated cell in the same process, and CSI-RS resources are multiplexed to calculate interference information. Determining CQI, CSI-IM can save costs of resources when the number of cooperative cells is relatively large.
  • FIG. 1 is a schematic diagram of an application scenario of a method for determining a CQI according to an embodiment of the present invention
  • FIG. 1b is a schematic diagram of CSI-RS resource configuration and CSI-IM resource configuration configured for a user equipment according to the scenario shown in FIG. 1a in the prior art;
  • FIG. 1c is a schematic diagram of CSI-RS resource configuration and CSI-IM resource configuration configured for a user equipment according to the scenario shown in FIG. 1a according to an embodiment of the present disclosure
  • FIG. 2 is a schematic structural diagram of a base station in a CQI determining method according to an embodiment of the present disclosure
  • FIG. 3 is a schematic structural diagram of a baseband subsystem of a base station in a CQI determining method according to an embodiment of the present disclosure
  • FIG. 4 is a schematic flowchart 1 of a method for determining a CQI according to an embodiment of the present invention
  • FIG. 5 is a schematic diagram of an application scenario of a method for determining a CQI according to an embodiment of the present disclosure
  • FIG. 5b is a schematic diagram of CSI-RS resource configuration and CSI-IM resource configuration configured for a user equipment according to the scenario shown in FIG. 1 according to the embodiment of the present invention
  • FIG. 6 is a schematic flowchart 2 of a method for determining a CQI according to an embodiment of the present disclosure
  • FIG. 7 is a schematic flowchart 3 of a method for determining a CQI according to an embodiment of the present disclosure
  • FIG. 8 is a schematic flowchart 4 of a method for determining a CQI according to an embodiment of the present disclosure
  • FIG. 9 is a schematic flowchart 5 of a method for determining a CQI according to an embodiment of the present disclosure.
  • FIG. 10 is a schematic flowchart 6 of a method for determining a CQI according to an embodiment of the present invention
  • FIG. 11 is a schematic structural diagram 1 of a user equipment according to an embodiment of the present disclosure.
  • FIG. 12 is a schematic structural diagram 2 of a user equipment according to an embodiment of the present disclosure.
  • FIG. 13 is a schematic structural diagram 3 of a user equipment according to an embodiment of the present disclosure.
  • FIG. 14 is a schematic structural diagram 1 of a base station according to an embodiment of the present disclosure.
  • FIG. 15 is a schematic structural diagram 2 of a base station according to an embodiment of the present disclosure.
  • FIG. 16 is a schematic structural diagram of hardware of a user equipment according to an embodiment of the present disclosure.
  • FIG. 17 is a schematic structural diagram of hardware of a base station according to an embodiment of the present invention.
  • N coordinated cells cooperative cell 1, coordinated cell 2, and coordinated cell 3, ... coordinated cell N
  • the collaboration set It refers to a set of multiple cells that directly or indirectly participate in the user data transmission at the same time
  • the cell in the cooperation set includes a serving cell and a plurality of coordinated cells participating in cooperation.
  • the plurality of cooperative cells participating in the cooperation and the serving cell perform information exchange by using a scheduler, for example, the serving cell acquires, by using a scheduler, indication information that each coordinated cell sends to the user equipment, and uses a scheduler to each coordinated cell.
  • the base stations to which they belong respectively transmit the CSI and CQI measured by the user equipment.
  • Each coordinated cell in the cooperative set serves the UE in the Comp mode.
  • both the CSI-RS resource and the CSI-IM resource of the same CSI process are configured in one subframe.
  • the UE uses Channel State Information-Reference Signal (CSI-RS) to measure channel state information (CSI), and uses CSI-IM (interference measurement). Resources) Measure interference information.
  • the UE calculates and quantizes the channel information and the interference information into a Precoding Matrix Indicator (PMI), a Rank Indication (CRI), and a Channel Quality Indicator (CQI), and feeds back to the serving cell.
  • PMI Precoding Matrix Indicator
  • CRI Channel Quality Indicator
  • CQI Channel Quality Indicator
  • the base station configures one channel state information interference measurement CSI-IM resource for each coordinated cell, and measures the interference information of other coordinated cells to one coordinated cell, the first cell is configured as IMR, and the other cells send data.
  • the base station when the UE measures the CQI of each coordinated cell, the base station must configure one channel state information interference measurement CSI-IM resource for each coordinated cell, when there are three coordinated cells in the cooperation set.
  • the three coordinated cells have 12 types of CSI-IM resources in the CoMP scenario.
  • the same coordinated cell may receive different interference information under different CSI-IM resources, because when the coordinated cell When the number is N, there are a total of N ⁇ 2 N-1 CSI-IM resources. Therefore, the overhead of measuring interference information using CSI-IM resources increases greatly as the number of coordinated cells increases.
  • the embodiment of the present invention obtains the channel state information reference signal CSI-RS resource of each coordinated cell in the cooperation set. As shown in FIG.
  • each coordinated cell is calculated according to the CSI-RS resources precoded by each coordinated cell.
  • At least one interference information under the CSI-IM resource determining, according to interference information of each coordinated cell under at least one of the CSI-IM resources and downlink channel information of each coordinated cell, that each coordinated cell is at least A channel quality indicator CQI under each of the CSI-IM resources in the CSI-IM resource.
  • the interference information is calculated by multiplexing the CSI-RS resources, so that the overhead of the CSI-RS does not increase with the increase of the interference assumption.
  • the words “first”, “second” and the like are used to distinguish the same or similar items whose functions and functions are substantially the same, in the field.
  • the skilled person will understand that the words “first”, “second” and the like do not limit the number and order of execution.
  • the technical solution provided by the embodiment of the present invention can be applied to various wireless communication networks, for example, a global system for mobile communication (GSM) system, and a code division multiple access (CDMA) system.
  • GSM global system for mobile communication
  • CDMA code division multiple access
  • WCDMA Wideband code division multiple access
  • UMTS universal mobile telecommunication system
  • GPRS general packet radio service
  • LTE long term evolution
  • LTE-A advanced long term evolution
  • WiMAX worldwide interoperability for microwave access
  • a wireless terminal may also be called a system, a subscriber unit, a subscriber station, a mobile station, a mobile station, a remote station, an access point, or an access point.
  • Remote Terminal Access Terminal, User Terminal, User Agent, or User Equipment.
  • a base station may be a device that communicates with a UE (User Equipment) or other communication site, such as a relay station, and the base station may provide communication of a specific physical area. cover.
  • the base station may be a base transceiver station (Base Transceiver Station, BTS for short) or a base station controller (BSC) in GSM or CDMA; or a Node B (Node B in UMTS).
  • BTS Base Transceiver Station
  • BSC base station controller
  • Node B Node B in UMTS
  • NB Radio Network Controller
  • eNB or eNodeB evolved Node B
  • LTE Long Term Evolution
  • Other access network devices that provide access services in the embodiments of the present invention are not limited.
  • a base station may be a device that communicates with a UE (User Equipment) or other communication site, such as a relay station, and the base station may provide communication of a specific physical area. cover.
  • the base station may be a base transceiver station (Base Transceiver Station, BTS for short) or a base station controller (BSC) in GSM or CDMA; or a Node B (Node B in UMTS).
  • BTS Base Transceiver Station
  • BSC base station controller
  • Node B Node B in UMTS
  • NB Radio Network Controller
  • eNB or eNodeB evolved Node B
  • LTE Long Term Evolution
  • Other access network devices that provide access services in the embodiments of the present invention are not limited.
  • the base station eNodeB includes a baseband subsystem, a middle radio frequency subsystem, an antenna feed subsystem, and some supporting structures (for example, a whole subsystem), wherein the baseband
  • the system is used to implement the operation and maintenance of the entire base station, implement signaling processing, radio resource principle, and transmit interface to EPC (Evolved Packet Core) to implement LTE physical layer and MAC (Medium Access Control) layer.
  • EPC Evolved Packet Core
  • the middle RF subsystem realizes conversion between baseband signal, intermediate frequency signal and radio frequency signal, realizes demodulation of LTE wireless receiving signal and modulation and power amplification of transmission signal;
  • antenna feeder subsystem The antenna and the feeder connected to the radio frequency module of the base station and the antenna and the feeder of the GRS receiving card are used for receiving and transmitting the wireless air interface signal;
  • the whole subsystem is a supporting part of the baseband subsystem and the intermediate frequency subsystem, providing a structure, Power and environmental monitoring capabilities.
  • the baseband subsystem can be as shown in FIG. 3: for example, the mobile phone accesses the Internet through the base station to access the core network (MME/S-GW), and accesses the Internet through the core network, where the data of the Internet passes through the core network and the base station.
  • the interface is transmitted to the baseband part, and the baseband part performs PDCP, RLC, MAC layer, coding, modulation, etc., and is sent to the radio frequency part for transmission to the terminal.
  • the baseband and the radio frequency can be connected through the CPRI interface; in addition, the radio frequency part can be pulled far by the optical fiber, for example, the remote RRU.
  • the baseband of each step of the configuration method in the embodiment of the present invention is implemented by radio frequency, and the receiving and transmitting step is implemented by an antenna (for example, an air interface).
  • the interface between the user equipment and the base station involved in the implementation of the present invention may be understood as an air interface for communication between the user equipment and the base station, or may also be referred to as a Uu interface.
  • the UE may be distributed throughout the wireless network, and each UE may be static or mobile.
  • the UE may be a wireless terminal or a wired terminal, and the wireless terminal may be a device that provides voice and/or data connectivity only to the user, a handheld device with wireless connectivity, or other processing device connected to the wireless modem.
  • the wireless terminal can communicate with one or more core networks via a RAN (Radio Access Network), which can be a mobile terminal, such as a mobile phone (or "cellular" phone) and a computer with a mobile terminal.
  • a RAN Radio Access Network
  • it may be a portable, pocket, handheld, computer built-in or in-vehicle mobile device that exchanges language and/or data with a wireless access network.
  • a UE may be referred to as a terminal, a mobile station, a subscriber unit, a station, or the like.
  • the UE may be a cellular phone, a personal digital assistant (PDA), a wireless modem, a wireless communication device, a handheld, a laptop computer, or the like.
  • PDA Personal Digital Assistant
  • the UE When the UE is applied to the M2M mode communication, the UE may be referred to as an M2M terminal, and may specifically be a smart meter, a smart home appliance, or the like that supports M2M communication.
  • the invention is not limited.
  • an embodiment of the present invention provides a CQI determining method, as shown in FIG. 4, including:
  • the base station configures a channel state information reference signal CSI-RS resource and at least one channel state information interference measurement CSI-IM resource for each coordinated cell in the cooperation set.
  • the user equipment acquires a channel state information reference signal CSI-RS resource and at least one channel state information interference measurement CSI-IM resource of each coordinated cell in the cooperation set.
  • the base station sends, to the user equipment, first indication information, where the first indication information is used to indicate that the user equipment measures interference information in the at least one interference combination, where the first indication information includes at least one interference combination,
  • the interference combination is any combination of the at least one CSI-IM resource;
  • the user equipment receives the first indication information sent by the base station.
  • the user equipment calculates, according to the CSI-RS resource of each coordinated cell and the at least one interference combination indicated in the first indication information, interference information of each coordinated cell in each interference combination in the at least one interference combination.
  • the user equipment determines, according to interference information of each coordinated cell in each interference combination of each coordinated cell and downlink channel information of each coordinated cell, each coordinated cell in each of the interference combinations.
  • the channel quality indication CQI under the interference combination is
  • An embodiment of the present invention provides a method for determining a CQI, by using one CSI-RS resource and at least one CSI-IM resource configured for each coordinated cell by a base station in the same process, so that the user equipment can be configured according to at least one interference combination.
  • both the CSI-RS resource and the CSI-IM resource of the same CSI process are configured in one subframe, so that when the number of coordinated cells is relatively large.
  • the overhead of measuring interference using CSI-IM resources is greatly increased as the number of coordinated cells increases, so the embodiment of the present invention is in the same process for each For cell configuration a CSI-RS resource and at least one CSI-IM resource, and to determine a CQI based on the interference composition multiplexing calculating interference information CSI-RS resource, saving the overhead of CSI-IM resources when the
  • the first indication information includes at least one interference combination, where the interference combination includes a CSI-IM resource configured by any one of the coordinated cells in the coordinated set and a CSI-IM resource configured by at least one coordinated cell configured in the coordinated set. .
  • the interference quantity combinations not limited and may be selected according to the required settings, in general, since the number of combinations may cooperate interference by the number of cells within the cooperating set according to the formula N ⁇ 2 N- 1 determines that the combination between the CSI-IM resources of one coordinated cell configuration indicated in each interference combination and the CSI-IM resources of another coordinated cell configuration can be set as needed.
  • the number of the specific coordinated cells in the cooperation set is not limited, and the number of the coordinated cells may be three or three or more, which is not limited by the implementation of the present invention.
  • the CSI-IM resources configured by Cell1 are respectively CSI-IM1-1, CSI-IM1-2, and CSI-IM1-
  • the number of CSI-IM resources configured by CSI-IM2-1, CSI-IM2-2, CSI-IM2-3, and Cell3 is CSI-IM3-1 and CSI- respectively.
  • IM3-2, CSI-IM3-3 in this way, the interference combination includes 12 possible cases, which are not listed in detail in the embodiment of the present invention.
  • the The interference combination can be: CSI-IM1-1 and CSI-IM1-2, CSI-IM1-2 and CSI-IM1-3, CSI-IM1-1 and CSI-IM1-3, and CSI-IM1-1, CSI-IM1 -2, CSI-IM1-3.
  • the user equipment in S402 can obtain the channel state information reference signal CSI-RS resource of each coordinated cell in the cooperation set by using a high-level signaling configuration of the coordinated cell, for example, RRC (Radio Resource Control) signaling.
  • RRC Radio Resource Control
  • the UE sends a signal to the base station through the uplink, where the signal is a carrier for transmitting various types of information including data, commands, and messages, and the UE receives the signal sent by the base station through the downlink.
  • the signal is a carrier for transmitting various types of information including data, commands, and messages
  • the UE receives the signal sent by the base station through the downlink.
  • the CSI-RS resource in the embodiment of the present invention uses the pre-coded CSI-RS resource, and the pre-coded CSI-RS resource and the coordinated cell are in the next scheduling.
  • the beam direction of the periodic transmission data is the same.
  • the embodiment of the present invention only uses the third coordinated cell as an example to describe how to obtain the pre-coded CSI-RS resources of each coordinated cell by using CSI-RS resources.
  • the UE acquires time-frequency resources occupied by the CSI-RS pre-configured by the current scheduling period of the third coordinated cell;
  • the user equipment receives, on the time-frequency resource, a first reference signal that is sent by the base station to which the third coordinated cell belongs, where the first reference signal is a CSI-RS that is pre-configured in a current scheduling period of the third coordinated cell. a signal after passing through the channel of the third coordinated cell;
  • the user equipment acquires the CSI of the third coordinated cell according to the first reference signal, where the CSI of the third coordinated cell includes a first precoding matrix PMI and a rank indication RI of the third coordinated cell. .
  • the user equipment sends the CSI of the third coordinated cell to the base station;
  • the base station obtains a matrix PMI1 that is closest to the PMI channel matrix of the third coordinated cell from the codebook prestored in the database according to the PMI of the third coordinated cell; performs SVD decomposition on the channel matrix H1, and determines according to the feature value.
  • the UE Since the CQI measured by the current scheduling period in the prior art is measured based on the PMI of the current scheduling period, and the accurate CQI should be based on the PMI of the next scheduling period, the UE measures the channel state information CSI through the CSI-RS resource and provides the serving cell to the serving cell. The PMI is fed back, and the serving cell will use the PMI to pre-code the CSI-RS resources and send them in the same beam direction.
  • the pre-coded CSI-RS is used in the same beam direction as the data. Interference information is calculated using CSI-RS resources such that the overhead of CSI-RS does not increase with the increase of interference assumptions. Therefore, the embodiment of the present invention uses pre-coded CSI-RS resources, which can further improve the measurement accuracy of the CQI.
  • the method and the principle of the interference information of the at least one type of the CSI-IM resources of each coordinated cell of the UE in the cooperation set are the same.
  • the description does not have any indicative meaning.
  • the S405 can be specifically implemented by:
  • S4051 Calculate, according to the CSI-RS resource configured by the first coordinated cell, the remaining coordinated cells except the first coordinated cell in the collaboration set, and the first Interference power of the coordinated cell;
  • the S4051 can be specifically implemented by the following steps:
  • S40511 Determine, according to downlink channel information of each coordinated cell and CSI-RS resources sent by each coordinated cell, reference signal power of each coordinated cell.
  • I i
  • 2 can be obtained, where I i is the reference signal power of the i-th coordinated cell.
  • the reference signal power of each coordinated cell is determined as the interference power of the remaining coordinated cells in the coordinated set when the coordinated cell transmits data.
  • I 1 can be regarded as interference power to cell 2 and cell 3 when cell 1 transmits data.
  • S40512 Determine, according to any combination of the reference signal power of each coordinated cell and the at least one CSI-IM resource indicated by the at least one interference combination, the coordinated set received by each coordinated cell except the coordinated cell. The interference power of the remaining coordinated cells to the coordinated cell.
  • the interference assumption in the implementation of the present invention includes 12 examples as shown in Table 1. If the reference signal powers of the coordinated cell 1, the coordinated cell 2, and the coordinated cell 3 are I 1 , I 2 , and I 3 , respectively, the configuration of each coordinated cell is as shown in FIG. 5b.
  • the CSI-IM configured by one coordinated cell is used to measure the CSI of the coordinated cell in other coordinated cells.
  • the CSI-IM resources in Cell1 in FIG. 5b are ZP CSI-RSs configured for measuring Cell2 cell CSI and ZP (Zero Power) CSI-RSs configured for measuring Cell3 cell CSI. Therefore, the interference combination in the Cell1 may be a ZP CSI-RS configured to measure a Cell2 cell CSI, or may be a ZP CSI-RS configured to measure a Cell3 cell CSI, or may be used to measure a Cell2 cell CSI.
  • the configured ZP CSI-RS and the ZP CSI-RS configured to measure the Cell3 cell CSI.
  • the reference power of the ZP CSI-RS configured for measuring the CSI configured in each coordinated cell may be used as the interference power of the coordinated cell to other coordinated cells when the other cells transmit data.
  • the CSI-IM resource is Table 1
  • the CSI-IM information configured by one coordinated cell is a DPB
  • the interference power of the remaining coordinated cells in the coordinated set received by each coordinated cell to the coordinated cell under the combination of 12 different interference hypotheses can be obtained in the above manner.
  • the interference information received by each coordinated cell is calculated, there may be interference caused by other cells except the cooperation set to any one of the cells in the cooperation set.
  • the other cell pairs other than the cooperation set are specifically acquired in S4052.
  • the manner of the interference power of the first coordinated cell is not limited.
  • S4052 in the embodiment of the present invention may be specifically implemented in the following manner:
  • S40521 The downlink channel information of the first coordinated cell, the CSI-RS resource sent by the first coordinated cell on the first time-frequency resource, and the first received by the user equipment on the first time-frequency resource And determining, by the reference signal, interference information of the other cell other than the cooperation set to the first coordinated cell.
  • the sum of the interference powers of the cells to the first coordinated cell is determined as the interference information of the first coordinated cell under the at least one interference combination.
  • the CSI-IM resource is the interference hypothesis 1 shown in Table 1
  • the CSI-IM resource is the interference hypothesis 2 shown in Table 1
  • the CSI-IM resource is the interference hypothesis 3 shown in Table 1
  • the method further includes S407:
  • S407. Determine downlink channel information of each coordinated cell according to CSI-RS resources of each coordinated cell.
  • the method for determining the downlink channel information of each coordinated cell according to the CSI-RS resources of each coordinated cell is not limited in the embodiment of the present invention.
  • Illustrative can pass the formula Downlink channel information of each coordinated cell, where X i and Y i are CSI-RS resources transmitted by the i-th coordinated cell on the first time-frequency resource and CSI-RS received on the first time-frequency resource, respectively
  • the resource, H i is channel information experienced by the CSI-RS resource when the CSI-RS resource is sent by the i th cooperative cell.
  • the first time-frequency resource is any one of the coordinated cells.
  • the coordinated cell When the downlink channel information of a coordinated cell in the coordinated set is calculated, the coordinated cell is configured as an NZP (Non-zero Power) CSI-RS resource on the first time-frequency resource, and the remaining coordinated cells in the coordinated set are in the first
  • the ZP (Zero Power) CSI-RS resource is configured on the one-time frequency resource.
  • the coordinated cell 1 is configured as an NZP CSI-RS resource on a time-frequency resource
  • ZP CSI is configured on the same time-frequency resource that the coordinated cell 2 and the coordinated cell 3 are in the same time resource as the coordinated cell 1 -RS resources.
  • the manner of calculating the downlink channel information of each coordinated cell is the same as that of the first coordinated cell, and details are not described herein again.
  • the calculation of the downlink channel information of each coordinated cell may pass the pre-coded CSI-RS resource and may also pass the CSI-RS resource.
  • the embodiment of the present invention may pass the CSI-RS resource. Calculating downlink channel information of each coordinated cell, and then acquiring reference signal power of each coordinated cell and a serving cell pair outside the coordinated set according to downlink channel information of each coordinated cell calculated by the precoded CSI-RS resource The interference power of any coordinated cell in the cooperation set can improve the measurement accuracy of the CQI.
  • the method further includes: S408-S411:
  • the base station sends, by using the serving cell, the power of the data sent by the next scheduling period to each coordinated cell in the cooperation set.
  • the user equipment acquires, according to the power that each coordinated cell in the collaboration set sends data in a next scheduling period.
  • the embodiment of the present invention does not limit the manner in which the user equipment in the S409 obtains the power of the data sent by the coordinated cell in the next scheduling period, and may be the base station to which the user equipment belongs from each coordinated cell.
  • the local base station to which each coordinated cell belongs is directly sent to the user equipment through the serving cell.
  • S411 Determine, according to the adjusted reference signal power of the fourth coordinated cell, the fourth coordinated cell. Interference power for the remaining coordinated cells except the fourth coordinated cell in the cooperation set.
  • the power of data transmitted by each coordinated cell in the next scheduling period is used as the reference signal power of the coordinated cell, and the measurement accuracy of the CQI can be improved.
  • the embodiment of the present invention does not limit the form of the first indication information, and the first indication message may be sent by the base station of the serving cell after the user equipment sends a request to the serving cell, or may be when the coordinated cell sends a CSI request.
  • the base station directly transmits through the serving cell.
  • the method further includes:
  • a base station is configured as a first CSI-RS resource configured by each coordinated cell in a coordinated set.
  • the first CSI-RS resource includes a CSI-RS signal pre-configured in a current scheduling period of each coordinated cell, where different coordinated cells are used.
  • the current scheduling period pre-configured CSI-RS is configured in different CSI processes;
  • CSI-RS resource measuring channel state information CSI of each coordinated cell according to the first CSI-RS resource;
  • a CSI of one coordinated cell includes a precoding matrix PMI and a rank indication RI of the coordinated cell;
  • the base station to which each coordinated cell in the coordinated set belongs respectively acquires a pre-coded CSI-RS of each coordinated cell according to channel state information of each coordinated cell, where the pre-coded CSI-RS
  • the beam direction of the data transmitted by the coordinated cell in the next scheduling period is consistent.
  • the method further includes step S416:
  • S416 Receive second indication information that is sent by the serving cell in the collaboration set, where the second indication information includes a number of each CSI-IM resource, where the second indication information is used to indicate that CSI-IM resources with the same number are to be used.
  • the signal power on at least one of the resource elements RE is averaged as the power of the CSI-IM resource.
  • one CSI-IM resource includes at least one resource element RE
  • the resource elements RE belonging to the same CSI-IM resource have the same identifier, and the identifiers of the resource elements RE belonging to different CSI-IM resources are different.
  • each CSI-IM resource corresponds to one number, and each CSI-IM resource includes multiple RE units, the interference power measured by the user equipment on each RE is different, so the same numbered CSI-IM is required.
  • the power on all REs in the resource is averaged as the power of the CSI-IM resource. This can further improve the measurement accuracy of the CQI.
  • each CSI-IM resource does not limit the identification form of each CSI-IM resource, and may be, for example, a number, a number, or a letter.
  • the embodiment of the present invention further provides a possible implementation manner.
  • the method further includes:
  • the channel quality indicator CQI of each coordinated CSI-IM resource in each of the at least one CSI-IM resource is sent by the serving cell in the cooperation set to the base station to which each coordinated cell belongs. .
  • the base station may be configured to acquire the CQI of each coordinated cell in each of the CSI-IM resources in time, and select a corresponding user equipment according to the CQI of each coordinated CSI-IM resource of each coordinated cell.
  • the right resource may be configured to acquire the CQI of each coordinated cell in each of the CSI-IM resources in time, and select a corresponding user equipment according to the CQI of each coordinated CSI-IM resource of each coordinated cell.
  • an embodiment of the present invention provides a device, which may be a user equipment or a chip or a circuit that can be disposed in a user equipment, where the user equipment or chip or circuit is used to execute the user equipment in the foregoing method.
  • the user equipment or chip or circuit may include modules corresponding to the respective steps.
  • the user equipment or chip or circuit includes:
  • the acquiring unit 10 is configured to acquire a channel state information reference signal CSI-RS resource configured by each coordinated cell in the cooperation set and at least one channel state information interference measurement CSI-IM resource;
  • the calculating unit 11 is configured to calculate, according to the CSI-RS resources configured by each coordinated cell, interference information of each coordinated cell under the at least one interference combination, where the interference combination is in the at least one CSI-IM resource Any combination of
  • the first determining unit 12 is configured to determine, according to the interference information of each coordinated cell under the at least one interference combination and the downlink channel information of each coordinated cell, each of the coordinated cells in the interference combination.
  • the channel quality under the interference combination indicates the CQI.
  • An embodiment of the present invention provides a method for determining a CQI, by using one CSI-RS resource and at least one CSI-IM resource configured for each coordinated cell by a base station in the same process, so that the user equipment can be configured according to at least one interference combination.
  • both the CSI-RS resource and the CSI-IM resource of the same CSI process are configured in one subframe, so that when the number of coordinated cells is relatively large.
  • the overhead of measuring interference using CSI-IM resources is greatly increased as the number of coordinated cells increases, so the embodiment of the present invention is in the same process for each For cell configuration a CSI-RS resource and at least one CSI-IM resource, and to determine a CQI based on the interference composition multiplexing calculating interference information CSI-RS resource, saving the overhead of CSI-IM resources when the
  • the CSI-RS resource configured by each coordinated cell is a pre-coded CSI-RS resource, and the pre-coded CSI-RS resource is consistent with the beam direction of the coordinated cell in the next scheduling period.
  • the first coordinated cell is any one of all coordinated cells in the coordinated set.
  • the calculating unit 11 includes:
  • the first calculating module 1101 is configured to calculate, according to the CSI-RS resources configured by the first coordinated cell, the remaining coordinated cells in the cooperation set except the first coordinated cell, and perform at least one type of the interference combination Interference power of the first coordinated cell;
  • a second calculating module 1102 configured to calculate interference power of the other cell other than the cooperation set to the first coordinated cell
  • a determining module 1103 configured to reduce a collaboration other than the first coordinated cell in the collaboration set And determining, by the interference power of the first coordinated cell, the sum of the interference power of the other coordinated cell and the interference power of the other coordinated cell to the first coordinated cell Interference information of the coordinated cell under at least one interference combination.
  • the user equipment further includes a second determining unit 13 , where the second determining unit 13 is specifically configured to:
  • the downlink channel information of each coordinated cell is determined according to the CSI-RS resources configured by each coordinated cell.
  • the second calculating module 1102 is specifically configured to: according to the downlink channel information of the first coordinated cell, the CSI-RS resource sent by the first coordinated cell on the first time-frequency resource, and the user equipment in the first time
  • the first reference signal received on the frequency resource determines interference information of the other cell other than the cooperation set to the first coordinated cell.
  • the user equipment further includes an adjusting unit, where the adjusting unit is specifically configured to: acquire power of data sent by each coordinated cell in the coordinated set in a next scheduling period; if it is determined that the fourth coordinated cell sends data in a next scheduling period, The power difference between the power of the fourth coordinated cell and the reference signal power of the fourth coordinated cell is adjusted, and the reference signal power of the fourth coordinated cell is adjusted; the reference signal power of the adjusted fourth coordinated cell is determined to be the fourth coordinated cell to the coordinated set. Interference power of the remaining coordinated cells except the fourth coordinated cell.
  • the user equipment further includes: a first receiving unit, configured to: receive first indication information sent by the serving cell in the collaboration set; the first indication information is used to indicate the user
  • the device measures interference information of the at least one interference combination, where the first indication information includes at least one interference combination, where the interference combination includes any one of the CSI-IM resources and the collaboration set configured by any one of the coordinated cell configurations in the cooperation set.
  • the user equipment further includes: a first acquiring unit, a measuring unit, and a first sending unit, where the first acquiring unit is configured to: acquire a first CSI-RS resource configured by each coordinated cell in the collaboration set And at least one CSI-IM resource, where the first CSI-RS resource includes a CSI-RS signal pre-configured for a current scheduling period of each coordinated cell; wherein a CSI-RS configured in a current scheduling period of different coordinated cells is configured Different CSI processes; the measuring unit is configured to: measure channel state information CSI of each of the coordinated cells according to the first CSI-RS resource; a CSI of one coordinated cell includes a precoding matrix PMI and a rank indication RI of the coordinated cell The first sending unit is configured to send channel state information CSI of each of the coordinated cells to a serving cell in the cooperation set, so that each base station in the cooperation set respectively belongs to a base station according to each The channel state information of the coordinated cell acquires a CSI-RS precoded by each coordinated cell, where the precode
  • one CSI-IM resource includes at least one resource element RE, and the resource elements RE belonging to the same CSI-IM resource have the same identifier, and the identifiers of the resource elements RE belonging to different CSI-IM resources are different, and the user equipment is different.
  • 11 further includes a second receiving unit, where the second receiving unit is configured to: receive second indication information sent by the serving cell in the collaboration set, where the second indication information includes a number of each CSI-IM resource, where The second indication information is used to indicate that the signal power on at least one resource element RE of the CSI-IM resources with the same number is averaged as the power of the CSI-IM resource.
  • the user equipment further includes: a second sending unit, where the second sending unit is configured to: send, to the serving cell in the cooperation set, each of the interferences in each of the at least one interference component of each coordinated cell Group
  • the combined channel quality indicates the CQI.
  • the user equipment or the chip or the circuit in this embodiment may correspond to the user equipment in the CQI determining method of the foregoing embodiment of any one of FIG. 4, FIG. 6 to FIG. 10, and the user equipment in this embodiment.
  • the division and/or function of each module in the chip or the circuit is to implement the method flow shown in any one of FIG. 4 and FIG. 6 to FIG. 10 .
  • no further details are provided herein.
  • an embodiment of the present invention provides a device, which may be a base station, or may be a chip or a circuit that can be set in a base station; the base station or chip or circuit is used to perform the above CQI determining method.
  • the steps performed by the base station may include modules corresponding to the respective steps.
  • the base station or chip or circuit comprises:
  • the configuration unit 1501 is configured to configure, for each coordinated cell in the cooperation set, a channel state information reference signal CSI-RS resource and at least one channel state information interference measurement CSI-IM resource;
  • the first sending unit 1502 is configured to send first indication information to the user equipment, where the first indication information is used to instruct the user equipment to measure interference information in the at least one interference combination, where the first indication information includes at least one Interference combination, the interference combination being any combination of the at least one CSI-IM resource;
  • the first receiving unit 1503 is configured to receive, by the user equipment, a channel quality indicator CQI of each of the interference combinations in each of the at least one of the interference combinations in the coordinated set.
  • the first indication information includes a combination of each coordinated cell in the cooperation set under different CSI-IM resources.
  • the base station 15 further includes:
  • a second sending unit 1504 configured to send the second indication information to the user equipment, where the second indication information includes a number of each CSI-IM resource, where the second indication information is used to indicate that the user equipment is the same number
  • the signal power on at least one of the resource elements RE in the CSI-IM resources is averaged as interference of the CSI-IM resources.
  • the configuration unit 1501 is further configured to: configure, for each of the coordinated cells in the collaboration set, a first channel state information CSI-RS resource and at least one CSI-IM resource, so that the user equipment is configured according to the The first CSI-RS resource measures channel state information CSI of each of the coordinated cells.
  • the base station further includes:
  • a second receiving unit configured to receive channel state information CSI of each of the coordinated cells by using a serving cell in the cooperation set, where a CSI of one coordinated cell includes a precoding matrix PMI and a rank indication RI of the coordinated cell ;
  • An acquiring unit configured to acquire a pre-coded CSI-RS corresponding to each of the coordinated cells according to a CSI of each coordinated cell, where a pre-coded CSI-RS of one coordinated cell and the coordinated cell are under The beam direction of the data transmitted in a scheduling period is consistent;
  • a third sending unit configured to configure, according to the pre-coded CSI-RS of each of the coordinated cells, a pre-coded CSI-RS for each of the coordinated cells, so that the user equipment according to each of the coordinated cells
  • the corresponding pre-coded CSI-RS is configured to calculate interference information of each coordinated cell under at least one interference combination.
  • the base station or the chip or the circuit in this embodiment may correspond to the base station in the CQI determining method of the foregoing embodiment of any one of FIG. 4, FIG. 6 to FIG. 10, and the base station or chip of the embodiment or
  • the division and/or function of each module in the circuit is to implement the method flow shown in any one of FIG. 4 and FIG. 6 to FIG. 10 .
  • no further details are provided herein.
  • an embodiment of the present invention provides a device, which may be a user equipment or a chip or circuit that can be disposed in a user equipment, including: a processor 30, a memory 31, a system bus 32, and a communication interface 33;
  • the memory 31 is configured to store computer execution instructions
  • the processor 30 is connected to the memory 31 via the system bus 32, when the user equipment or a chip or circuit that can be disposed in the user equipment is operated,
  • the processor 30 executes the computer-executed instructions stored by the memory 31 to cause the user equipment or a chip or circuit that can be disposed in the user equipment to perform as described in any one of FIG. 4, FIG. 6 to FIG.
  • the CQI determines the method performed by the user equipment in the method. For the specific CQI determination method, refer to the related description in the embodiment shown in FIG. 4 and any one of FIG. 6 to FIG. 10, and details are not described herein again.
  • the processor 30 can be a central processing unit (English: central processing unit, abbreviation: CPU).
  • the processor 30 can also be other general-purpose processors, digital signal processing (DSP), application specific integrated circuit (ASIC), field programmable gate array (English) : field-programmable gate array (FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc.
  • DSP digital signal processing
  • ASIC application specific integrated circuit
  • FPGA field-programmable gate array
  • the general purpose processor may be a microprocessor or the processor or any conventional processor or the like.
  • the processor 30 may be a dedicated processor, and the dedicated processor may include at least one of a baseband processing chip, a radio frequency processing chip, and the like. Further, the dedicated processor may also include a chip having other dedicated processing functions of the user equipment.
  • the memory 31 may include a volatile memory (English: volatile memory), such as a random access memory (English: random-access memory, abbreviation: RAM); the memory 31 may also include a non-volatile memory (English: Non-volatile memory, such as read-only memory (English: read-only memory, abbreviation: ROM), flash memory (English: flash memory), hard disk (English: hard disk drive, abbreviation: HDD) or solid state drive (English) : solid-state drive, abbreviated: SSD); the memory 31 may also include a combination of the above types of memories.
  • a volatile memory such as a random access memory (English: random-access memory, abbreviation: RAM)
  • the memory 31 may also include a non-volatile memory (English: Non-volatile memory, such as read-only memory (English: read-only memory, abbreviation: ROM), flash memory (English: flash memory), hard disk (English: hard disk drive, abbreviation: HDD) or solid state drive (English)
  • the system bus 32 can include a data bus, a power bus, a control bus, and a signal status bus. For the sake of clarity in the present embodiment, various buses are illustrated as system bus 32 in FIG.
  • the communication interface 33 may specifically be a transceiver on a user equipment or an input/output interface of a chip or a circuit.
  • the transceiver can be a wireless transceiver.
  • the wireless transceiver can be an antenna of a user equipment or the like.
  • the processor 30 transmits and receives data to and from other devices, such as a base station, through the communication interface 33.
  • the base station may configure one CSI-RS resource and at least one CSI-IM resource for each coordinated cell in the same process, so that the user
  • the channel state information CSI under each CSI-IM resource may be calculated according to the one CSI-RS resource and the at least one CSI-IM resource, and may also interfere with one CSI-IM resource of any one of the coordinated cells indicated in the combination and at least
  • the combination between any one of the CSI-IM resources configured by one coordinated cell determines the channel quality indicator CQI of each coordinated cell under each interference combination in at least one interference combination, because the same CSI is measured when measuring CQI in the prior art.
  • the process CSI-RS resource and the CSI-IM resource are all configured in one subframe, so that when the number of coordinated cells is relatively large, the CSI-IM resource is utilized.
  • the cost of the source measurement interference is greatly increased as the number of the coordinated cells increases. Therefore, the embodiment of the present invention configures one CSI-RS resource and at least one CSI-IM resource for each coordinated cell in the same process, and multiplexes the CSI-RS resources.
  • the interference information is calculated to determine the CQI, and the overhead of the CSI-IM resource can be saved when the number of coordinated cells is relatively large.
  • each step in the flow of the CQI determination method as described in any one of FIG. 4 and FIG. 6 to FIG. 10 may execute the computer in the form of software stored in the memory 31 by the processor 30 in hardware form. Execution instructions are implemented. To avoid repetition, we will not repeat them here.
  • the embodiment further provides a storage medium, which may include the memory 31.
  • An embodiment of the present invention provides a readable medium, including a computer executing instruction, when a processor, such as a user equipment or a processor of a chip or a circuit that can be disposed on a user equipment, executes the computer to execute an instruction, the user equipment or The chip or circuit that can be provided to the user equipment performs the CQI determination method as described in the first aspect or the optional aspect of the first aspect described above.
  • a processor such as a user equipment or a processor of a chip or a circuit that can be disposed on a user equipment, executes the computer to execute an instruction, the user equipment or
  • the chip or circuit that can be provided to the user equipment performs the CQI determination method as described in the first aspect or the optional aspect of the first aspect described above.
  • an embodiment of the present invention provides a device, which may be a base station or a chip or circuit that can be disposed in a base station, including: a processor 40, a memory 41, a system bus 42, and a communication interface 43;
  • the memory 41 is configured to store computer execution instructions, and the processor 40 is coupled to the memory 41 via the system bus 42.
  • the processor 40 executing the computer-executed instructions stored in the memory 41 to enable the base station or a chip or circuit that can be disposed in the base station to perform the CQI determination method as described in any one of FIGS. 6-10.
  • CQI determination method refer to the related description in the embodiment shown in FIG. 4 and any one of FIG. 6 to FIG. 10, and details are not described herein again.
  • Embodiments of the present invention provide a readable medium, including computer-executed instructions, when a base station or a processor of a chip or circuit that can be disposed in a base station executes the computer to execute an instruction, the base station or a chip that can be set in a base station
  • the OR circuit performs a method corresponding to the base station in the CQI determination method described in any one of the alternative modes of FIG. 4 and FIG.
  • the processor 40 can be a CPU.
  • the processor 40 can also be other general purpose processors, DSPs, ASICs, FPGAs or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, and the like.
  • the general purpose processor may be a microprocessor or the processor or any conventional processor or the like.
  • the processor 40 may be a dedicated processor, which may include at least one of a baseband processing chip, a radio frequency processing chip, and the like. Further, the dedicated processor may also include a chip having other dedicated processing functions of the base station.
  • the memory 41 may include a volatile memory such as a random access memory RAM; the memory 41 may also include a non-volatile memory such as a read only memory ROM, a flash memory, an HDD or an SSD; A combination of memories of the above kind may be included.
  • a volatile memory such as a random access memory RAM
  • the memory 41 may also include a non-volatile memory such as a read only memory ROM, a flash memory, an HDD or an SSD; A combination of memories of the above kind may be included.
  • the system bus 42 can include a data bus, a power bus, a control bus, and a signal status bus. For the sake of clarity in the present embodiment, various buses are illustrated as the system bus 42 in FIG.
  • the communication interface 43 may specifically be a transceiver on a base station or an input/output interface of a chip or a circuit that can be disposed in a base station.
  • the transceiver can be a wireless transceiver.
  • the wireless transceiver can be an antenna of a base station or the like.
  • the processor 40 performs data transmission and reception with other devices, such as user equipment, through the communication interface 43.
  • each step of the base station in the method flow shown in any one of FIG. 4, FIG. 6 and FIG. 10 can execute the computer-executed instruction in the form of software stored in the memory 41 by the processor 40 in hardware form. achieve. To avoid repetition, we will not repeat them here.
  • the embodiment of the present invention provides a communication system, where the communication system includes a plurality of user equipments and base stations.
  • the communication system includes a plurality of user equipments and base stations.
  • each of the plurality of user equipments refer to the foregoing as shown in FIG. 11 to FIG. 13 and FIG.
  • the description of the base station refer to the related description of the base station in the foregoing embodiment shown in FIG. 14 , FIG. 15 and FIG. 17 , and details are not described herein again.
  • the CQI determining method in the foregoing embodiment of the present invention is used by multiple user equipments and a base station to enable the user equipment to determine the interference of each coordinated cell by using the CSI-RS resource.
  • the channel quality of each of the interference combinations in the combination indicates a CQI, so that when the number of coordinated cells is large, the base station does not need to configure more IMR resources for the user equipment, which solves the problem in the prior art when the number of coordinated cells is large.
  • the problem of using IMR to measure the overhead of interference increases substantially as the number of coordinated cells increases.
  • the units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, may be located in one place, or may be distributed to multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of the embodiment.
  • each functional unit in each embodiment of the present invention may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.
  • the above integrated unit can be implemented in the form of a software functional unit.
  • the integrated unit if implemented in the form of a software functional unit and sold or used as a standalone product, may be stored in a computer readable storage medium.
  • all or part of the technical solution may be embodied in the form of a software product stored in a storage medium, including a plurality of instructions for causing a computer device (which may be a personal computer, a server, Either a network device or the like) or a processor performs all or part of the steps of the method described in various embodiments of the invention.
  • the storage medium is a non-transitory medium, including: a flash memory, a mobile hard disk, a read only memory, a random access memory, a magnetic disk, or an optical disk, and the like, which can store program code.

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  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Quality & Reliability (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

L'invention concerne un procédé de détermination de CQI, un équipement utilisateur et une station de base, se rapportant au domaine des communications, pour résoudre le problème existant dans l'état de la technique selon lequel, lorsque le nombre de cellules coordonnées est très grand, le surdébit pour mesurer le brouillage avec un MIR augmenterait considérablement avec l'augmentation des cellules coordonnées. Le procédé comprend les étapes suivantes : un équipement utilisateur acquiert une ressource de signal de référence d'informations d'état de canal (CSI-RS) et au moins une ressource de mesure de brouillage d'informations d'état de canal (CSI-IM) configurées pour chaque cellule coordonnée dans un ensemble de coordination ; l'équipement utilisateur calcule, selon la ressource de CSI-RS configurée pour chaque cellule coordonnée, des informations de brouillage concernant chaque cellule coordonnée sous au moins une combinaison de brouillage ; et l'équipement utilisateur détermine, selon les informations de brouillage concernant chaque cellule coordonnée sous ladite combinaison de brouillage et des informations de canal de liaison descendante concernant chaque cellule coordonnée, un indice de qualité de canal (CQI) de chaque cellule coordonnée sous chacune des combinaisons de brouillage. Les modes de réalisation de la présente invention sont appliqués à un scénario de mesure de CQI.
PCT/CN2017/084525 2016-05-16 2017-05-16 Procédé de détermination de cqi, équipement utilisateur et station de base WO2017198142A1 (fr)

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CN110149645B (zh) * 2019-04-08 2022-11-15 浙江吉利控股集团有限公司 一种无线信道干扰的测量方法及装置
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