CN107395332B - CQI determination method, user equipment and base station - Google Patents

CQI determination method, user equipment and base station Download PDF

Info

Publication number
CN107395332B
CN107395332B CN201610323533.2A CN201610323533A CN107395332B CN 107395332 B CN107395332 B CN 107395332B CN 201610323533 A CN201610323533 A CN 201610323533A CN 107395332 B CN107395332 B CN 107395332B
Authority
CN
China
Prior art keywords
csi
cooperative
cell
resource
interference
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
CN201610323533.2A
Other languages
Chinese (zh)
Other versions
CN107395332A (en
Inventor
姚赛杰
任海豹
李元杰
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Huawei Technologies Co Ltd
Original Assignee
Huawei Technologies Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Huawei Technologies Co Ltd filed Critical Huawei Technologies Co Ltd
Priority to CN201610323533.2A priority Critical patent/CN107395332B/en
Priority to PCT/CN2017/084525 priority patent/WO2017198142A1/en
Publication of CN107395332A publication Critical patent/CN107395332A/en
Application granted granted Critical
Publication of CN107395332B publication Critical patent/CN107395332B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Classifications

    • 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
    • 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
    • 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

Abstract

The embodiment of the invention provides a CQI (channel state information) determining method, user equipment and a base station, relates to the field of communication, and aims to solve the problem that in the prior art, when the number of cooperative cells is large, the overhead of measuring interference by utilizing IMR (inertial measurement unit) is greatly increased along with the increase of the cooperative cells; the user equipment calculates the interference information of each cooperative cell under at least one interference combination according to the CSI-RS resource configured by each cooperative cell; and the user equipment determines the channel quality indicator CQI of each cooperative cell under each interference combination in the interference combinations according to the interference information of each cooperative cell under at least one interference combination and the downlink channel information of each cooperative cell. The embodiment of the invention is applied to a CQI measurement scene.

Description

CQI determination method, user equipment and base station
Technical Field
The embodiment of the invention relates to the field of communication, in particular to a CQI (channel quality indicator) determining method, user equipment and a base station.
Background
In order to improve the frequency utilization efficiency of an LTE (Long Term Evolution) network, when the LTE network is deployed, neighboring cells are generally configured to be the same frequency band, but since the neighboring cells use the same frequency band, interference is generated between the neighboring cells, and thus throughput of user equipment located at the edge of the neighboring cells is sharply reduced. With the rapid increase in the number of user equipments in commercial LTE networks, the inter-cell interference becomes more and more severe and becomes a decisive factor for the capacity of the system network.
The CoMP (Coordinated Multipoint Transmission) technology can further improve the throughput and frequency utilization efficiency of the UE at the edge of the neighboring cell in the LTE network and improve the capacity of the entire LTE network. The CoMP technology is based on sharing of link Channel State Information (CSI) and user data information by each cooperative base station to different degrees, and converts interference originally in an adjacent cell into useful information through cooperation of inter-cell base stations, and the core idea of the CoMP technology is as follows: one UE or a plurality of UEs are served by a plurality of transmission points with spatial position adjacency simultaneously, so that the inter-cell interference is reduced, and the cell edge UE throughput and the system throughput are improved through the dynamic cooperative work among a plurality of geographically separated base stations.
The CoMP technology includes downlink CoMP Transmission and uplink CoMP reception, where the downlink CoMP Transmission mainly includes JT (Joint Transmission), coordinated scheduling and CS/CB (coordinated scheduling and Beamforming), and DPS/DPB (Dynamic Point Selection/turn-off), where JT is divided into coherent JT and incoherent JT. The upstream CoMP technology includes Joint Reception (JR), CS, and DPS/DPB.
The CoMP technology is mainly focused on outdoor deployment scenarios, and indoor deployment scenarios are not yet applied. The indoor deployment scene data traffic is usually very large, and the radio frequency isolation between the cooperative base stations is usually poor. There are many large-scale indoor deployment scenarios, such as stations, airports, stadiums, supermarkets, and office buildings, among others. 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.
In the prior art, the UE generally measures CSI (Channel State Information ) by using a CSI-RS (Channel State Information-Reference Signal) of an NZP (Non-zero Power) and measures interference Information by using an IMR (interference measurement resource). The UE calculates and quantizes the measured CSI and the interference information into a Precoding Matrix Indicator (PMI), a Rank Indicator (RI), and a CQI, and feeds back the PMI, the Rank indicator, and the CQI to the base station to which the serving cell belongs, so that the base station to which the serving cell belongs selects an appropriate resource for the UE according to a CQI value fed back from the UE side.
However, due to the limitation of the configuration of the existing CoMP technology, one CSI-RS resource and one CSI-IM resource of the same CSI process are both configured in one subframe, so that the UE has only a small amount of interference assumptions when measuring interference information, for example, when the number of cells in the coordination set is 3, the UE can only report four possible CQIs at most simultaneously by using the above configuration, because different interference assumptions, the UE can obtain different CQI values, when the UE measures interference information of any one coordination cell by other coordination cells in the coordination set, the IMR is configured for the any one coordination cell, the any one coordination cell does not send data on the IMR, and the other coordination cells send data on the IMR, but when the number of coordination cells is large, the requirement is difficult to be met, the large-scale indoor deployment scenario cannot be solved well, and when there are many coordination cells, the different interference assumptions lead to a substantial increase in the overhead of interference measurement resources.
Disclosure of Invention
Embodiments of the present invention provide a CQI determination method, user equipment, and a base station, so as to solve a problem in the prior art that when the number of cooperative cells is large, the overhead of measuring interference by using IMR increases greatly with the increase of the cooperative cells.
In order to achieve the above purpose, the embodiment of the invention adopts the following technical scheme:
in a first aspect, an embodiment of the present invention provides a CQI determining method, including: the method comprises the steps that user equipment obtains a channel state information reference signal (CSI-RS) resource and at least one channel state information interference measurement (CSI-IM) resource configured by each cooperation cell in a cooperation set; the user equipment calculates the interference information of each cooperative cell under at least one interference combination according to the CSI-RS resource configured by each cooperative cell; wherein the interference combination is any combination of the at least one CSI-IM resource; and the user equipment determines the channel quality indicator CQI of each cooperative cell under each interference combination in the interference combinations according to the interference information of each cooperative cell under at least one interference combination and the downlink channel information of each cooperative cell.
The embodiment of the invention provides a CQI determining method, which comprises the steps of determining interference information of each cooperative cell under each interference combination according to a combination of a CSI-IM resource configured by any one cooperative cell in a cooperative set and a CSI-IM resource configured by at least one cooperative cell in the cooperative set by user equipment according to a CSI-RS resource and at least one CSI-IM resource configured by the base station for each cooperative cell in the same process, determining channel quality indication CQI of each cooperative cell under each interference combination in at least one interference combination according to the interference information of each cooperative cell under at least one interference combination and downlink channel information of each cooperative cell, wherein in the prior art, when measuring CQI, the same CSI process CSI-RS resource and the CSI-IM resource are both configured in a subframe, therefore, when the number of the cooperative cells is larger, the cost for measuring the interference by using the CSI-IM resources is greatly increased along with the increase of the cooperative cells, so that the embodiment of the invention configures one CSI-RS resource and at least one CSI-IM resource for each cooperative cell in the same process, and multiplexes the CSI-RS resources according to the interference combination to calculate the interference information so as to determine the CQI, and the cost of the CSI-IM resources can be saved when the number of the cooperative cells is larger.
With reference to the first aspect, in a first possible implementation manner of the first aspect, the CSI-RS resource of each cooperative cell is a precoded CSI-RS resource, and the precoded CSI-RS resource is consistent with a beam direction in which the cooperative cell transmits data in a next scheduling period. Therefore, the CQI measured by the user equipment is based on the CSI-RS of the next scheduling period, and the measurement accuracy of the CQI is improved.
With reference to the first aspect, in a second possible implementation manner of the first aspect, for a first cooperating cell, the first cooperating cell is any one of all cooperating cells in a cooperating set, and a user equipment calculates, according to a CSI-RS resource configured by the first cooperating cell, interference information of the first cooperating cell under at least one interference combination, including: the user equipment calculates the interference power of other cooperative cells except the first cooperative cell in a cooperative set to the first cooperative cell under at least one interference combination according to the CSI-RS resource configured by the first cooperative cell; the user equipment calculates the interference power of other cells except the cooperation set to the first cooperation cell; the user equipment determines the sum of the interference power of the rest cooperative cells except the first cooperative cell in the cooperative set to the first cooperative cell under at least one interference combination and the interference power of other cells except the cooperative set to the first cooperative cell as the interference information of the first cooperative cell under at least one interference combination.
With reference to the second possible implementation manner of the first aspect, in a third possible implementation manner of the first aspect, the method further includes: and the user equipment determines the downlink channel information of each cooperative cell according to the CSI-RS resource configured by each cooperative cell.
With reference to the third possible implementation manner of the first aspect, in a fourth possible implementation manner of the first aspect, the calculating, by the user equipment, interference power of other cells outside the cooperation set to the first cooperation cell includes: according to the downlink channel information of the first cooperation cell, CSI-RS resources sent by the first cooperation cell on first time-frequency resources and first reference signals received by user equipment on the first time-frequency resources, the interference information of other cells except the cooperation set to the first cooperation cell is determined. This can improve the measurement accuracy of CQI.
With reference to the first aspect, in a fourth possible implementation manner of the first aspect, before the determining, by the user equipment, the channel quality indicator CQI of each cooperative cell in each interference combination in the interference combinations according to the interference information of each cooperative cell in at least one interference combination and the downlink channel information of each cooperative cell, the method further includes: the method comprises the steps that user equipment obtains the power of data sent by each cooperation cell in a cooperation set in the next scheduling period; if the power difference exists between the power of the fourth cooperation cell for sending data in the next scheduling period and the reference signal power of the fourth cooperation cell, the user equipment adjusts the reference signal power of the fourth cooperation cell; and the user equipment determines the adjusted reference signal power of the fourth cooperation cell as the interference power of the fourth cooperation cell to the rest cooperation cells except the fourth cooperation cell in the cooperation set. Because the accurate CQI is based on the CSI-RS of the next scheduling period, the interference information received by each cooperative cell can be accurately acquired and the measurement accuracy of the CQI is improved by adjusting the power of data transmitted by each cooperative cell and the next scheduling period.
With reference to the first aspect, in a fifth possible implementation manner of the first aspect, the method further includes: the method comprises the steps that user equipment receives first indication information sent by a serving cell in a cooperation set; the first indication information is used for indicating the user equipment to measure interference information under at least one interference combination, the first indication information includes at least one interference combination, and the interference combination includes a combination of one CSI-IM resource configured by any one cooperative cell in the cooperative set and a CSI-IM resource configured by at least one cooperative cell in the cooperative set. Therefore, the base station only needs to tell the user equipment which CQI under the CSI-IM resource combination is specifically measured through the indication information, and therefore the overhead of the CSI-IM resources is reduced.
With reference to any one of the first aspect to the fifth possible implementation manner of the first aspect, in a sixth possible implementation manner of the first aspect, before the obtaining, by the ue, a CSI-RS resource and at least one CSI-IM resource configured by each cooperating cell in the cooperating set, the method further includes: the method comprises the steps that user equipment obtains a first CSI-RS resource and at least one CSI-IM resource which are configured for each cooperative cell in a cooperative set, wherein the first CSI-RS resource comprises a CSI-RS signal which is pre-configured for the current scheduling period of each cooperative cell; the CSI-RS pre-configured in the current scheduling period of different cooperative cells are configured in different CSI processes; the user equipment measures the Channel State Information (CSI) of each cooperative cell according to the first CSI-RS resource; the CSI of one cooperative cell comprises a precoding matrix PMI and a rank indication RI of the cooperative cell; the method comprises the steps that user equipment sends Channel State Information (CSI) of each cooperation cell to a service cell in a cooperation set, so that a base station to which each cooperation cell in the cooperation set belongs obtains a pre-coded CSI-RS of each cooperation cell according to the channel state information of each cooperation cell, wherein the pre-coded CSI-RS is consistent with a beam direction of the cooperation cell for sending data in the next scheduling period.
With reference to the first aspect to the sixth possible implementation manner of the first aspect, in a seventh possible implementation manner of the first aspect, one CSI-IM resource includes at least one resource element RE, resource elements REs belonging to the same CSI-IM resource have the same identifier, and identifiers of resource elements REs belonging to different CSI-IM resources are different; the method further comprises the following steps: the user equipment receives second indication information sent by a serving cell in a cooperation set, the second indication information comprises the number of each CSI-IM resource, and the second indication information is used for indicating that the signal power on at least one resource element RE in the CSI-IM resources with the same number is averaged to be used 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.
With reference to the first aspect to the seventh possible implementation manner of the first aspect, in an eighth possible implementation manner of the first aspect, the method further includes: and sending a Channel Quality Indication (CQI) of each cooperative cell in each interference combination of at least one interference combination to a serving cell in the cooperative set. Therefore, the base station can acquire each small cooperative CQI under each CSI-IM resource in time, and select corresponding appropriate resources for the user equipment according to the CQI of each cooperative cell under each CSI-IM resource.
In a second aspect, an 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 cooperative cell in a cooperative set; the first indication information is used for indicating the user equipment to measure interference information under at least one interference combination, the first indication information includes at least one interference combination, and the interference combination is any combination in the at least one CSI-IM resource; and receiving the channel quality indication CQI of each cooperative cell in the cooperative set under each interference combination in at least one interference combination sent by the user equipment.
With reference to the second aspect, in a first possible implementation manner of the second aspect, the method further includes: and second indication information is sent to the user equipment, the second indication information comprises the number of each CSI-IM resource, and the second indication information is used for indicating the user equipment to take the average of the signal power on at least one resource element RE in the CSI-IM resources with the same number as the power of the CSI-IM resource.
With reference to the second aspect, in a second possible implementation manner of the second aspect, the method further includes:
receiving Channel State Information (CSI) of each cooperative cell sent by user equipment, wherein the CSI of one cooperative cell comprises a Precoding Matrix (PMI) and a Rank Indication (RI) of the cooperative cell; acquiring a precoded CSI-RS corresponding to each cooperative cell according to the CSI of each cooperative cell; the precoded CSI-RS of one cooperative cell is consistent with the beam direction of the cooperative cell for sending data in the next scheduling period; and configuring the corresponding precoded CSI-RS for each cooperative cell according to the precoded CSI-RS of each cooperative cell, so that the user equipment configures the corresponding precoded CSI-RS according to each cooperative cell, and calculates the interference information of each cooperative cell under at least one interference combination.
In a third aspect, an embodiment of the present invention provides a user equipment, including:
the acquisition unit is used for acquiring a channel state information reference signal (CSI-RS) resource and at least one channel state information interference measurement (CSI-IM) resource configured by each cooperative cell in a cooperative set; the calculation unit is used for calculating the interference information of each cooperative cell under at least one interference combination according to the CSI-RS resource configured by each cooperative cell; wherein the interference combination is any combination of the at least one CSI-IM resource; a first determining unit, configured to determine, according to interference information of each cooperative cell in at least one interference combination and downlink channel information of each cooperative cell, a channel quality indicator CQI of each cooperative cell in each interference combination.
With reference to the third aspect, in a first possible implementation manner of the third aspect, the CSI-RS resource configured by each cooperative cell is a precoded CSI-RS resource, and the precoded CSI-RS resource is consistent with a beam direction in which the cooperative cell transmits data in a next scheduling period.
With reference to the third aspect, in a second possible implementation manner of the third aspect, for a first cooperation cell, the first cooperation cell is any one cooperation cell of all cooperation cells in a cooperation set, and the calculating unit includes: a first calculating module, configured to calculate, according to a CSI-RS resource configured by a first cooperating cell, interference power to the first cooperating cell under at least one interference combination of the other cooperating cells except the first cooperating cell in the cooperating set; a second calculating module, configured to calculate interference power of other cells outside the cooperation set to the first cooperation cell; a determining module, configured to determine, as interference information of the first cooperative cell under at least one interference combination, a sum of interference powers of other cooperative cells in the cooperative set except the first cooperative cell to the first cooperative cell under the at least one interference combination and interference powers of other cells in the cooperative set except the first cooperative cell to the first cooperative cell.
With reference to the second possible implementation manner of the third aspect, in a third possible implementation manner of the third aspect, the user equipment further includes a second determining unit, where the second determining unit is specifically configured to: and determining the downlink channel information of each cooperative cell according to the CSI-RS resource configured by each cooperative cell.
With reference to the third possible implementation manner of the third aspect, in a fourth possible implementation manner of the third aspect, the second calculating module is specifically configured to: according to the downlink channel information of the first cooperation cell, CSI-RS resources sent by the first cooperation cell on the first time-frequency resources and first reference signals received by user equipment on the first time-frequency resources, the interference information of other cells outside the cooperation set on the first cooperation cell is determined.
With reference to the third aspect, in a fifth possible implementation manner of the third aspect, the user equipment further includes an adjusting unit, where the adjusting unit is specifically configured to: acquiring the power of data transmission of each cooperative cell in the cooperative set in the next scheduling period; if the power difference exists between the power of the fourth cooperative cell for sending data in the next scheduling period and the reference signal power of the fourth cooperative cell, adjusting the reference signal power of the fourth cooperative cell; and determining the adjusted reference signal power of the fourth cooperation cell as the interference power of the fourth cooperation cell to the rest cooperation cells except the fourth cooperation cell in the cooperation set.
With reference to the third aspect, in a sixth possible implementation manner of the third aspect, the user equipment further includes a first receiving unit, where the first receiving unit is configured to: receiving first indication information sent by a serving cell in the cooperation set; the first indication information is used for indicating the user equipment to measure interference information under at least one interference combination, the first indication information includes at least one interference combination, and the interference combination includes a combination between any one CSI-IM resource configured by any one cooperative cell in a cooperative set and any one CSI-IM resource configured by at least one cooperative cell in the cooperative set.
With reference to any one of the third to fifth possible implementation manners of the third aspect, in a seventh possible implementation manner of the third aspect, the user equipment further includes a first obtaining unit, a measuring unit, and a first sending unit, where the first obtaining unit is configured to: acquiring a first CSI-RS resource and at least one CSI-IM resource configured for each cooperative cell in the cooperative set, wherein the first CSI-RS resource comprises a CSI-RS signal pre-configured for the current scheduling period of each cooperative cell; the CSI-RS pre-configured in the current scheduling period of different cooperative cells are configured in different CSI processes; the measurement unit is used for measuring the Channel State Information (CSI) of each cooperative cell according to the first CSI-RS resource; the CSI of one cooperative cell comprises a precoding matrix PMI and a rank indication RI of the cooperative cell; the first sending unit is configured to send the channel state information CSI of each cooperative cell to the serving cell in the cooperative set, so that the base station to which each cooperative cell in the cooperative set belongs obtains the precoded CSI-RS of each cooperative cell according to the channel state information of each cooperative cell, where the precoded CSI-RS is consistent with a beam direction in which the cooperative cell sends data in a next scheduling period.
With reference to any one of the third to seventh possible implementation manners of the third aspect, a CSI-IM resource includes at least one resource element RE, resource elements REs belonging to the same CSI-IM resource have the same identifier, and identifiers of resource elements REs belonging to different CSI-IM resources are different, where the user equipment further includes a second receiving unit, and the second receiving unit is specifically configured to: and receiving second indication information sent by a serving cell in the coordinated set, wherein the second indication information comprises the number of each CSI-IM resource, and the second indication information is used for indicating that the signal power on at least one resource element RE in the CSI-IM resources with the same number is averaged to be used as the power of the CSI-IM resource.
With reference to any one of the third aspect to the eighth possible implementation manners of the third aspect, the user equipment further includes a second sending unit, where the second sending unit is specifically configured to: and sending a Channel Quality Indication (CQI) of each cooperative cell in each interference combination of at least one interference combination to a serving cell in the cooperative set.
In a fourth aspect, an embodiment of the present invention provides a base station, including: the configuration unit is used for configuring a channel state information reference signal (CSI-RS) resource and at least one channel state information interference measurement (CSI-IM) resource for each cooperative cell in the cooperative set; a first sending unit, configured to send first indication information to a user equipment, where the first indication information is used to indicate that the user equipment measures interference information under at least one interference combination, and the first indication information includes at least one interference combination, where the interference combination is any combination in the at least one CSI-IM resource; a first receiving unit, configured to receive a channel quality indicator CQI, sent by a user equipment, of each cooperative cell in the cooperative set in each of at least one interference combination.
The first indication information comprises the combination of each cooperative cell in the cooperative set under different CSI-IM resources.
With reference to the fourth aspect, in a first possible implementation manner of the fourth aspect, the base station further includes: a second sending unit, configured to send second indication information to the ue, where the second indication information includes a number of each CSI-IM resource, and the second indication information is used to indicate that the ue averages signal power on at least one resource element RE in CSI-IM resources with the same number as interference of the CSI-IM resources.
With reference to the fourth aspect, in a second possible implementation manner of the fourth aspect, the configuration unit is further configured to: configuring a first CSI-RS resource and at least one CSI-IM resource for each cooperative cell in the cooperative set, so that the user equipment can measure the CSI of each cooperative cell according to the first CSI-RS resource.
With reference to the fourth aspect, in a third possible implementation manner of the fourth aspect, the base station further includes: a second receiving unit, configured to receive, through a serving cell in the cooperation set, channel state information CSI of each of the cooperating cells, where CSI of one cooperating cell includes a precoding matrix PMI and a rank indication RI of the cooperating cell; an obtaining unit, configured to obtain a precoded CSI-RS corresponding to each cooperative cell according to the CSI of each cooperative cell; the precoded CSI-RS of one cooperative cell is consistent with the beam direction of the cooperative cell for sending data in the next scheduling period; and a third sending unit, configured to configure a corresponding precoded CSI-RS for each cooperative cell according to the precoded CSI-RS of each cooperative cell, so that the user equipment configures a corresponding precoded CSI-RS according to each cooperative cell, and calculates interference information of each cooperative cell under at least one interference combination.
In a fifth aspect, 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 computer-executable instructions, and the processor is connected to the memory through the system bus, and when the user equipment runs, the processor executes the computer-executable instructions stored in the memory, so that the user equipment performs the CQI determination method according to the first aspect or any one of the options of the first aspect.
In a sixth aspect, an embodiment of the present invention provides a readable medium, which includes computer executable instructions, and when a processor of a user equipment executes the computer executable instructions, the user equipment executes the CQI determination method as described in the first aspect or any one of the optional manners of the first aspect.
In a seventh aspect, 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 computer-executable instructions, and the processor is connected to the memory through the system bus, and when the base station runs, the processor executes the computer-executable instructions stored in the memory, so as to enable the base station to perform the CQI determination method according to the second aspect or any one of the alternatives of the second aspect.
In an eighth aspect, an embodiment of the present invention provides a readable medium, which includes computer executable instructions, and when a processor of a base station executes the computer executable instructions, the base station performs the resource indication method as described in the second aspect or any one of the optional manners of the second aspect.
In a ninth aspect, an embodiment of the present invention provides a communication system, where the communication system includes a plurality of user equipments and a base station, the plurality of user equipments may be the user equipment described in the third aspect or any optional manner of the third aspect, and the base station may be the base station described in the fourth aspect or any optional manner of the fourth aspect; alternatively, the first and second electrodes may be,
the plurality of user equipments may be the user equipment described in the fifth aspect, and the base station may be the base station described in the seventh aspect.
Optionally, the user equipment may further include the readable medium of the sixth aspect, and the base station may further include the readable medium of the eighth aspect.
By adopting the above CQI determination method, the user equipment, the base station, and the communication system according to embodiments of the present invention can configure one CSI-RS resource and at least one CSI-IM resource for each cooperating cell in the same process, so that the user can not only calculate the CSI of the channel state information in each CSI-IM resource according to the one CSI-RS resource and the at least one CSI-IM resource, but also determine the CQI of the channel quality indication in each interfering combination in at least one interfering combination according to the combination between the one CSI-IM resource of any one cooperating cell indicated in the interfering combination and the any one CSI-IM resource configured in at least one cooperating cell, because in the prior art, when measuring the CQI, the CSI-RS resource and the CSI-IM resource of the same CSI process are both configured in one subframe, therefore, when the number of the cooperative cells is larger, the cost for measuring the interference by using the CSI-IM resources is greatly increased along with the increase of the cooperative cells, so that the embodiment of the invention configures one CSI-RS resource and at least one CSI-IM resource for each cooperative cell in the same process, and multiplexes the CSI-RS resources to calculate the interference information to determine the CQI, and the cost of the CSI-IM resources can be saved when the number of the cooperative cells is larger.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1a is an application scenario diagram of a CQI determination method according to an embodiment of the present invention;
fig. 1b is a schematic diagram illustrating a CSI-RS resource and a CSI-IM resource configuration configured for a ue according to the scenario shown in fig. 1a in the prior art;
fig. 1c is a schematic diagram illustrating a CSI-RS resource and a CSI-IM resource configured for a ue according to the scenario shown in fig. 1a according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a base station in a CQI determination method according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a base band subsystem of a base station in a CQI determination method according to an embodiment of the present invention;
fig. 4 is a first flowchart illustrating a CQI determination method according to an embodiment of the present invention;
fig. 5a is a schematic diagram of an application scenario of a CQI determination method according to an embodiment of the present invention;
fig. 5b is a schematic diagram illustrating a CSI-RS resource and a CSI-IM resource configured for a ue according to the scenario shown in fig. 1 in an embodiment of the present invention;
fig. 6 is a flowchart illustrating a CQI determination method according to an embodiment of the present invention;
fig. 7 is a third schematic flowchart of a CQI determination method according to an embodiment of the present invention;
fig. 8 is a fourth schematic flowchart of a CQI determination method according to an embodiment of the present invention;
fig. 9 is a fifth flowchart illustrating a CQI determination method according to an embodiment of the present invention;
fig. 10 is a sixth schematic flowchart of a CQI determination method according to an embodiment of the present invention;
fig. 11 is a first schematic structural diagram of a user equipment according to an embodiment of the present invention;
fig. 12 is a schematic structural diagram of a user equipment according to an embodiment of the present invention;
fig. 13 is a third schematic structural diagram of a user equipment according to an embodiment of the present invention;
fig. 14 is a first schematic structural diagram of a base station according to an embodiment of the present invention;
fig. 15 is a schematic structural diagram of a base station according to an embodiment of the present invention;
fig. 16 is a schematic hardware structure diagram of a user equipment according to an embodiment of the present invention;
fig. 17 is a schematic diagram of a hardware structure of a base station according to an embodiment of the present invention.
Detailed Description
Fig. 1a shows an application scenario of an embodiment of the present invention, in which N cooperative cells (cooperative cell1, cooperative cell2, and cooperative cell3 … … cooperative cell N) form a cooperative set, where the cooperative set refers to a set of multiple cells participating in the user data transmission directly or indirectly at the same time, and the cells in the cooperative set include a serving cell and several cooperative cells participating in cooperation. The serving cell obtains, through the scheduler, indication information sent by each cooperative cell to the user equipment, and sends, through the scheduler, CSI and CQI measured by the user equipment to the base station to which each cooperative cell belongs. Each cooperating cell in the cooperating set serves the UE in Comp.
In the prior art, when a serving cell sends a CSI request, CSI-RS resources and CSI-IM resources of the same CSI process are both configured in one subframe. The UE measures Channel State Information (CSI) using a Channel State Information Reference Signal (CSI-RS) of Non-zero Power (NZP, Non-zero Power), and measures interference Information using CSI-IM (interference measurement resource). The UE calculates and quantizes a Precoding Matrix Indicator (PMI), a Rank Indicator (RI), and a Channel Quality Indicator (CQI) according to the measured Channel information and interference information, and feeds back the PMI, the Rank indicator, and the Channel quality indicator to the serving cell. When user equipment needs to measure CQI, a base station configures a channel state information interference measurement CSI-IM resource for each cooperative cell, when measuring the interference information of other cooperative cells to one cooperative cell, a first cell is configured to be IMR, and other cells send data.
Illustratively, as shown in fig. 1b, when the UE measures the CQI of each cooperative cell, the base station must configure one for each cooperative cellThe CSI-IM resource is measured by channel state information interference, when 3 coordinated cells exist in a coordinated set, the 3 coordinated cells share 12 CSI-IM resources in a CoMP scene, however, when the number of the coordinated cells is large, different interference information may be received by the same coordinated cell under different CSI-IM resources, and because when the number of the coordinated cells is N, N2 is totalN -1The CSI-IM resource, therefore, the overhead of measuring interference information by using the CSI-IM resource is greatly increased with the increase of the cooperative cells. In the embodiment of the present invention, by obtaining a channel state information reference signal CSI-RS resource of each cooperative cell in a cooperative set, as shown in fig. 1c, interference information of each cooperative cell under at least one CSI-IM resource is calculated according to the precoded CSI-RS resource of each cooperative cell; and determining the Channel Quality Indicator (CQI) of each cooperative cell under each CSI-IM resource in at least one CSI-IM resource according to the interference information of each cooperative cell under the at least one CSI-IM resource and the downlink channel information of each cooperative cell. The interference information is calculated by multiplexing the CSI-RS resources in such a way that the CSI-RS overhead does not increase with the increase of the interference hypothesis.
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
For the convenience of clearly describing the technical solutions of the embodiments of the present invention, in the embodiments of the present invention, the words "first", "second", and the like are used to distinguish the same items or similar items with basically the same functions and actions, and those skilled in the art can understand that the words "first", "second", and the like do not limit the quantity and execution order.
The technical scheme provided by the embodiment of the invention can be applied to various wireless communication networks, such as: a global system for mobile communication (GSM) system, a Code Division Multiple Access (CDMA) system, a Wideband Code Division Multiple Access (WCDMA) system, a Universal Mobile Telecommunications (UMTS) system, a General Packet Radio Service (GPRS) system, a Long Term Evolution (LTE) system, a long term evolution advanced (LTE-a) system, a Worldwide Interoperability for Microwave Access (WiMAX) system, and the like. The terms "network" and "system" are used interchangeably.
The terms "network" and "system" are used interchangeably.
A wireless Terminal may also be referred to as a system, a Subscriber Unit (Subscriber Unit), a Subscriber Station (Subscriber Station), a Mobile Station (Mobile), a Remote Station (Remote Station), an Access Point (Access Point), a Remote Terminal (Remote Terminal), an Access Terminal (Access Terminal), a User Terminal (User Terminal), a User Agent (User Agent), or a User equipment.
In the embodiment of the present invention, a Base Station (BS) may be a device that communicates with a UE (User Equipment) or other communication stations, such as a relay station, and the base station may provide communication coverage in a specific physical area. For example, the Base Station may specifically be a Base Transceiver Station (BTS) or a Base Station Controller (BSC) in GSM or CDMA; or Node B in UMTS (Node B, abbreviated as NB) or Radio Network Controller (RNC) in UMTS; or an evolved Node B (eNB or eNodeB) in LTE; alternatively, the present invention may also be other access network devices providing access services in a wireless communication network, and the embodiments of the present invention are not limited thereto.
In the embodiment of the present invention, a Base Station (BS) may be a device that communicates with a UE (User Equipment) or other communication stations, such as a relay station, and the base station may provide communication coverage in a specific physical area. For example, the Base Station may specifically be a Base Transceiver Station (BTS) or a Base Station Controller (BSC) in GSM or CDMA; or Node B in UMTS (Node B, abbreviated as NB) or Radio Network Controller (RNC) in UMTS; or an evolved Node B (eNB or eNodeB) in LTE; alternatively, the present invention may also be other access network devices providing access services in a wireless communication network, and the embodiments of the present invention are not limited thereto.
As shown in fig. 2, a base station eNodeB in the embodiment of the present invention includes a baseband subsystem, a middle radio frequency subsystem, an antenna feed subsystem, and some supporting structures (e.g., a complete machine subsystem), where the baseband subsystem is configured to implement operation and maintenance of the entire base station, implement signaling processing, a radio resource principle, a transmission interface to an EPC (Evolved Packet Core), and implement LTE physical layer, MAC (Medium Access Control) layer, L3 signaling, and operation and maintenance master Control functions; the middle radio frequency subsystem realizes the conversion among baseband signals, intermediate frequency signals and radio frequency signals, and realizes the demodulation of LTE wireless receiving signals and the modulation and power amplification of transmitting signals; the antenna feeder subsystem comprises an antenna and a feeder which are connected to the base station radio frequency module and an antenna and a feeder of the GRS receiving card and is used for realizing the receiving and sending of wireless air interface signals; the whole subsystem is a supporting part of the baseband subsystem and the intermediate frequency subsystem and provides the functions of structure, power supply and environment monitoring.
The baseband subsystem may be as shown in fig. 3: for example, the mobile phone needs to access a core network (MME/S-GW) through a base station, and then access the internet through the core network, where data of the internet is transmitted to a baseband part through an interface between the core network and the base station, and the baseband part performs processing such as PDCP, RLC, MAC layer, coding, modulation, and so on, and then transmits the processed data to a radio frequency part to be transmitted to a terminal. The baseband and the radio frequency can be connected through a CPRI interface; in addition, the radio frequency part can currently be pulled far through an optical fiber, such as a pulled-far RRU. The configuration method in the embodiment of the present invention is implemented by a radio frequency in a baseband, and the receiving and transmitting steps are 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.
In the embodiments of the present invention, the UEs may be distributed throughout the wireless network, and each UE may be static or mobile. A UE may be a wireless terminal, which may be a wired terminal or a wireless terminal, which may be a device that provides voice and/or data connectivity only to a user, a handheld device having wireless connection capability, or other processing device connected to a wireless modem. Wireless terminals, which may be mobile terminals such as mobile telephones (or "cellular" telephones) and computers having mobile terminals, such as portable, pocket, hand-held, computer-included, or vehicle-mounted mobile devices, may communicate with one or more core networks via a RAN (Radio Access Network) to exchange language and/or data with a Radio Access Network. For example, PCS (Personal Communication Service) phones, cordless phones, Session Initiation Protocol (SIP) phones, WLL (Wireless Local Loop) stations, PDAs (Personal Digital assistants), and the like. A UE may be referred to as a terminal (terminal), a mobile station (mobile station), a subscriber unit (subscriber unit), a station (station), etc. The UE may be a cellular phone (cellular phone), a Personal Digital Assistant (PDA), a wireless modem (modem), a wireless communication device, a handheld device (handheld), a laptop computer (laptop), etc. When the UE is applied to M2M mode communication, the UE may be referred to as an M2M terminal, and specifically may be a smart meter, a smart appliance, or the like supporting M2M communication. The invention is not limited.
As shown in fig. 4, an embodiment of the present invention provides a CQI determining method, as shown in fig. 4, including:
s401, a 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 cooperative cell in a cooperative set;
s402, 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 cooperative cell in a cooperative set;
s403, the base station sends first indication information to the UE, wherein the first indication information is used for indicating the UE to measure interference information under at least one interference combination, the first indication information comprises at least one interference combination, and the interference combination is any combination in the at least one CSI-IM resource;
s404, the user equipment receives first indication information sent by the base station;
s405, the user equipment calculates interference information of each cooperative cell under each interference combination in at least one interference combination according to the CSI-RS resource of each cooperative cell and at least one interference combination indicated in the first indication information;
s406, the user equipment determines a Channel Quality Indicator (CQI) of each cooperative cell in each interference combination in at least one interference combination according to the interference information of each cooperative cell in each interference combination and the downlink channel information of each cooperative cell.
The embodiment of the invention provides a CQI determining method, which is characterized in that a CSI-RS resource and at least one CSI-IM resource are configured for each cooperative cell in the same process according to a base station, so that user equipment can determine interference information of each cooperative cell under each interference combination according to the combination between any one CSI-IM resource configured by any one cooperative cell in a cooperative set indicated by each interference combination in at least one interference combination and any one CSI-IM resource configured by at least one cooperative cell in the cooperative set, and determine channel quality indication CQI of each cooperative cell under each interference combination in at least one interference combination according to the interference information of each cooperative cell under at least one interference combination and downlink channel information of each cooperative cell, when the CQI is measured, the CSI-RS resource and the CSI-IM resource of the same CSI process are both configured in one subframe, so that when the number of the cooperative cells is larger, the interference measurement cost of the CSI-IM resource is greatly increased along with the increase of the cooperative cells, therefore, the CSI-RS resource and at least one CSI-IM resource are configured for each cooperative cell in the same process, the interference information is multiplexed according to the interference combination to calculate the interference information so as to determine the CQI, and the CSI-IM resource cost can be saved when the number of the cooperative cells is larger.
The first indication information comprises at least one interference combination, and the interference combination comprises a combination of one CSI-IM resource configured by any one cooperative cell in a cooperative set and a CSI-IM resource configured by at least one cooperative cell in the cooperative set.
The specific number of the interference combinations is not limited in the embodiments of the present invention, and may be selectively set as needed, and in general, the number of the interference combinations may be determined according to the formula N · 2 by the number of the cooperative cells in the cooperative setN-1And determining that the combination between the CSI-IM resource configured by one cooperative cell and the CSI-IM resource configured by the other cooperative cell indicated in each interference combination can be set as required.
The embodiment of the present invention does not limit the number of specific cooperative cells in the cooperative set, and the number of the cooperative cells may be 3 or more than 3, which is not limited in the implementation of the present invention.
Illustratively, there are 3 cooperative cells in the cooperative set, which are Cell1, Cell2 and Cell3, respectively, where the numbers of CSI-IM resources configured by Cell1 are CSI-IM1-1, CSI-IM1-2 and CSI-IM1-3, respectively; numbers of CSI-IM resources configured by Cell2 are CSI-IM2-1, CSI-IM2-2, CSI-IM2-3, and numbers of CSI-IM resources configured by Cell3 are CSI-IM3-1, CSI-IM3-2, and CSI-IM3-3, respectively, so that interference combinations include 12 possible cases, which are not listed in detail in this embodiment of the present invention, and for example, if interference information of the remaining cooperative cells on Cell1 is to be obtained, the interference combinations may 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-IM 1-3.
In S402, the ue may obtain the CSI-RS resource of the CSI-RS of each cooperating cell in the cooperating set through a higher layer signaling configuration of the cooperating cell, for example, an RRC (radio resource Control) signaling.
Specifically, the UE transmits a signal to the base station through an uplink, wherein the signal is a carrier for transmitting various types of information including data, commands, and messages, and the UE receives the signal transmitted by the base station through a downlink.
In a possible implementation manner of the embodiment of the present invention, the CSI-RS resource in the embodiment of the present invention is a precoded CSI-RS resource, and the precoded CSI-RS resource is consistent with a beam direction of the cooperative cell for sending data in a next scheduling period.
For example, the embodiment of the present invention only uses the third cooperating cell as an example to describe how to obtain the precoded CSI-RS resource of each cooperating cell through the CSI-RS resource.
Specifically, 1, the UE acquires a time-frequency resource occupied by CSI-RS pre-configured in the current scheduling period of the third cooperative cell;
2. the user equipment receives a first reference signal sent by a base station to which the third cooperative cell belongs on the time-frequency resource; the first reference signal is a signal of a CSI-RS pre-configured in the current scheduling period of the first cooperative cell after the CSI-RS passes through a channel of the first cooperative cell;
3. the user equipment acquires the CSI of the third cooperative cell according to the first reference signal; wherein the CSI of the third cooperative cell includes a first precoding matrix PMI and a rank indication RI of the third cooperative cell.
4. The user equipment sends the CSI of the third cooperative cell to a base station;
5. the base station acquires a matrix PMI1 which is closest to a PMI channel matrix of the third cooperative cell from a codebook prestored in a database according to the PMI of the third cooperative cell; SVD decomposition is carried out on the channel matrix H1, and RI1 is judged according to the eigenvalue;
6. and performing beam forming on the CSI-RS according to the precoding matrix PMI1 and by using the precoding matrix which is the same as the data, and acquiring the CSI-RS precoded by the sixth cooperative cell.
In the prior art, the CQI measured in the current scheduling period is measured based on the PMI of the current scheduling period, and the accurate CQI is based on the PMI of the next scheduling period, the UE measures the CSI through the CSI-RS resource and feeds back the PMI to the serving cell, and the serving cell uses the PMI to precode and send the CSI-RS resource to form the CSI-RS resource in the same beam direction of data. Therefore, the embodiment of the invention adopts the pre-coded CSI-RS resource, thereby further improving the measurement precision of the CQI.
Optionally, since the manner and principle of interference information of each cooperating cell of the UE in the cooperating set under at least one CSI-IM resource are the same, the embodiment of the present invention is described by taking the first cooperating cell as an example, and does not have any indicative meaning, for example, the S405 may specifically be implemented by the following manner:
s4051, according to the CSI-RS resource configured by the first cooperative cell, calculating the interference power to the first cooperative cell under at least one interference combination of the other cooperative cells except the first cooperative cell in the cooperative set;
wherein, the S4051 may specifically be implemented by the following steps:
s40511, determining the reference signal power of each cooperative cell according to the downlink channel information of each cooperative cell and the CSI-RS resource sent by each cooperative cell.
Illustratively, this may be represented by formula Ii＝|Hi·Xi|2Wherein, IiReference signal power of the ith cooperative cell.
In the embodiment of the invention, the reference signal power of each cooperative cell is determined as the interference power to the rest cooperative cells in the cooperative set when the cooperative cell transmits data. For example I1Can be considered as the interference power to cell2 and cell3 when cell1 transmits data.
S40512, determining according to the reference signal power of each cooperative cell and any combination of the at least one CSI-IM resource indicated by the at least one interference combination, wherein the interference power of the cooperative cells to the cooperative cells of the rest cooperative cells except the cooperative cells in the cooperative set received by each cooperative cell is determined by the reference signal power of each cooperative cell and the at least one interference combination.
For example, in the scenario shown in fig. 5a, when there are 3 cooperative cells in the cooperative set, the interference assumption in the implementation of the present invention includes 12 examples shown in table 1. If the reference signal power of the cooperative cell1, the cooperative cell2 and the cooperative cell3 is I respectively1、I2And I3The configuration of each cooperating cell is shown in fig. 5 b.
It should be noted that the CSI-IM configured by one cooperative cell is used for measuring CSI of the cooperative cell in other cooperative cells. The CSI-IM resources in Cell1 as in fig. 5b are ZP CSI-RS configured for measuring Cell2 Cell CSI and ZP (Zero Power) CSI-RS configured for measuring Cell3 Cell CSI. Therefore, the interference combination in the Cell1 may be a ZP CSI-RS configured for measuring Cell CSI of Cell2, a ZP CSI-RS configured for measuring Cell CSI of Cell3, or a ZP CSI-RS configured for measuring Cell CSI of Cell2 and a ZP CSI-RS configured for measuring Cell CSI of Cell 3. The reference power of the zpccsi-RS configured for measuring CSI in each cooperative cell may be used as the interference power of the cooperative cell to other cooperative cells when the cooperative cell transmits data in the other cells.
TABLE 13 CoMP/DPB interference hypothesis examples
Figure BDA0000991268990000211
Figure BDA0000991268990000221
When the CSI-IM resource is interference hypothesis 1 shown in Table 1, then cooperative cell2 and cooperative cellThe interference power of the region 3 to the cooperative cell1 is P1 ═ I2+I3(ii) a When the CSI-IM resource is interference hypothesis 2 shown in table 1, the interference power of cooperative cell2 and cooperative cell3 to cooperative cell1 is P1 ═ I2(ii) a When the CSI-IM resource is interference hypothesis 1 shown in table 1, the interference power of cooperative cell2 and cooperative cell3 to cooperative cell1 is P1 ═ I3。
It should be noted that, in the embodiment of the present invention, when the CSI-IM information configured by one cooperative cell is DPB, it is determined that the interference power of the cooperative cell to the remaining first cooperative cells in the cooperative set is 0. Through the above method, the interference power of the rest cooperative cells in the cooperative set to each cooperative cell under 12 different interference hypothesis combinations can be obtained.
S4052, calculating interference power of other cells except the cooperation set to the first cooperation cell;
since there may be interference caused by other cells outside the cooperation set to any cell in the cooperation set when calculating the interference information received by each cooperation cell, the embodiment of the present invention does not limit the manner in which S4052 specifically acquires the interference power of the other cells outside the cooperation set to the first cooperation cell.
S4052 in the embodiment of the present invention may specifically be implemented in the following manner:
s40521, determining interference information of other cells outside the cooperation set on the first cooperation cell according to the downlink channel information of the first cooperation cell, the CSI-RS resource sent by the first cooperation cell on the first time/frequency resource, and the first reference signal received by the user equipment on the first time/frequency resource.
Illustratively, this may be represented by formula Iout＝|Yi'-Hi·Xi|2Calculating the interference caused by other service cells except the cooperation set to each cooperation cell, wherein Yi' is a CSI-RS resource received on a first time-frequency resource of an ith cooperative cell, wherein XiIs represented on the first time-frequency resource of the ith cooperative cellA transmitted CSI-RS resource. It should be noted that, generally, when the base station transmits the CSI-RS resource on one time-frequency resource, the ue receives the CSI-RS resource on the same time-frequency resource.
S4053, determining a sum of interference power of other cooperative cells in the cooperative set except the first cooperative cell to the first cooperative cell under at least one interference combination and interference power of other cells in the cooperative set to the first cooperative cell as interference information of the first cooperative cell under at least one interference combination.
For example, when the CSI-IM resource is interference hypothesis 1 shown in table 1, the interference power of the cooperative cells 2 and 3 to the cooperative cell1 is P1 ═ I2+I3Then, the interference information of the cooperative cell1 when the CSI-IM resource is interference hypothesis 1 shown in table 1 is: P-P1 + IoutWherein, P1 ═ I2+I3，IoutInterference power of other cooperation cells outside the cooperation set received by the cooperation cell 1;
when the CSI-IM resource is interference hypothesis 2 shown in table 1, the interference power of cooperative cell2 and cooperative cell3 to cooperative cell1 is P1 ═ I2(ii) a Then, the interference information of the cooperative cell1 when the CSI-IM resource is the interference hypothesis 2 shown in table 1 is: P-P1 + IoutWherein, P1 ═ I2，IoutInterference power of other cooperation cells outside the cooperation set received by the cooperation cell 1;
when the CSI-IM resource is interference hypothesis 3 shown in table 1, the interference power of cooperative cell2 and cooperative cell3 to cooperative cell1 is P1 ═ I3(ii) a Then, the interference information of the cooperative cell1 when the CSI-IM resource is interference hypothesis 3 shown in table 1 is: P-P1 + IoutWherein, P1 ═ I3，IoutIs the interference power of the rest cooperative cells outside the cooperative set suffered by the cooperative cell 1.
In one implementation manner of the present invention, referring to fig. 6, the method further includes step S407:
s407, determining downlink channel information of each cooperative cell according to the CSI-RS resource of each cooperative cell.
The method and the device for determining the downlink channel information of each cooperative cell in the embodiment of the invention do not limit the mode of determining the downlink channel information of each cooperative cell according to the CSI-RS resource of each cooperative cell.
Illustratively, it can be represented by a formula
Figure BDA0000991268990000241
Downlink channel information of each cooperative cell, wherein XiAnd YiCSI-RS resource transmitted on the first time-frequency resource and CSI-RS resource received on the first time-frequency resource, H, respectively for the ith cooperation celliAnd channel information experienced by the CSI-RS resource when the CSI-RS resource is sent to the ith cooperation cell. And the first time-frequency resource is any time-frequency resource in the cooperative cell.
When calculating the downlink channel information of one cooperative cell in the cooperative set, the cooperative cell is configured as an NZP (Non-Zero Power) CSI-RS resource on the first time-frequency resource, and the rest cooperative cells in the cooperative set are configured as ZP (Zero Power) CSI-RS resources on the first time-frequency resource. For example, as shown in fig. 5a, the cooperative cell1 is configured as an NZP CSI-RS resource on a time-frequency resource, and ZP CSI-RS resources are configured on the same time-frequency resource as the cooperative cell1 in the cooperative cell2 and the cooperative cell 3. The way of calculating the downlink channel information of each cooperative cell is the same as that of the first cooperative cell, and the embodiment of the present invention is not described herein again.
It should be noted that, in the embodiment of the present invention, the calculation of the downlink channel information of each cooperative cell may be performed through the precoded CSI-RS resource or through the CSI-RS resource, and preferably, the embodiment of the present invention may calculate the downlink channel information of each cooperative cell through the precoded CSI-RS resource, and then, according to the downlink channel information of each cooperative cell calculated through the precoded CSI-RS resource, obtain the reference signal power of each cooperative cell and the interference power of the serving cell outside the cooperative set on any one cooperative cell in the cooperative set, so that the measurement accuracy of the CQI may be improved.
In another implementation manner of the present invention, referring to fig. 7, the method further includes: S408-S411:
s408, the base station sends the power of sending data in the next scheduling period to each cooperative cell in the cooperative set through the service cell;
s409, the user equipment acquires the power of data sent by each cooperation cell in the cooperation set in the next scheduling period;
in this embodiment of the present invention, a manner in which the user equipment in S409 obtains the power for each cooperative cell in the cooperative set to transmit data in the next scheduling period is not limited, and the power may be obtained by the user equipment from a base station to which each cooperative cell belongs, or may be directly transmitted to the user equipment by the base station to which each cooperative cell belongs through a serving cell.
S410, if the power difference between the power of the fourth cooperative cell for sending data in the next scheduling period and the reference signal power of the fourth cooperative cell is determined to exist, adjusting the reference signal power of the fourth cooperative cell;
s411, determining the adjusted reference signal power of the fourth cooperative cell as the interference power of the fourth cooperative cell to the rest cooperative cells except the fourth cooperative cell in the cooperative set.
Illustratively, if there is a reference signal power I of the cooperative cell11Power I for transmitting data with cooperative cell1 in next scheduling period1' if there is a power difference, the power difference I is obtained as I1-I1' and adjusting the reference signal power I of the cooperative cell1 according to the power difference1。
In this implementation manner, when calculating the CQI, the power of data transmitted by each cooperative cell in the next scheduling period is used as the reference signal power of the cooperative cell, so that 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 information may be sent by the base station of the serving cell after the user equipment sends the request to the serving cell, or may be sent directly by the base station through the serving cell when the cooperative cell sends the CSI request.
In another implementation manner of the embodiment of the present invention, as shown in fig. 8, the method further includes:
s412, configuring, by the base station, a first CSI-RS resource for each cooperation cell in the cooperation set; the first CSI-RS resource comprises a CSI-RS signal pre-configured in the current scheduling period of each cooperative cell; the CSI-RS pre-configured in the current scheduling period of different cooperative cells are configured in different CSI processes;
s413, obtaining a first CSI-RS resource configured by each cooperation cell in the cooperation set,
s414, measuring the Channel State Information (CSI) of each cooperative cell according to the first CSI-RS resource; the CSI of one cooperative cell comprises a precoding matrix PMI and a rank indication RI of the cooperative cell;
s415, sending channel state information CSI of each of the cooperative cells to a serving cell in the cooperative set;
s415-1, the base station to which each cooperative cell in the cooperative set belongs respectively acquires the precoded CSI-RS of each cooperative cell according to the channel state information of each cooperative cell, wherein the precoded CSI-RS is consistent with the beam direction of the cooperative cell for transmitting data in the next scheduling period.
In this implementation, the CQI is calculated based on the CSI-RS resource of the next scheduling period, which can improve the accuracy of CQI measurement.
In another possible implementation manner of the embodiment of the present invention, as shown in fig. 9, the method further includes step S416:
s416, receiving second indication information sent by the serving cell in the coordinated set, wherein the second indication information includes the number of each CSI-IM resource, and the second indication information is used for indicating that the signal power on at least one resource element RE in the CSI-IM resources with the same number is averaged to be used as the power of the CSI-IM resource.
In this implementation, one CSI-IM resource includes at least one resource element RE, the resource element REs belonging to the same CSI-IM resource have the same identifier, and the identifiers of the resource element REs belonging to different CSI-IM resources are different, but since each CSI-IM resource corresponds to one number and each CSI-IM resource includes multiple RE units, interference power measured by the user equipment on each RE is different, it is necessary to average power on all REs in the CSI-IM resource with the same number, and the average power is used as power of the CSI-IM resource. This can further improve the measurement accuracy of CQI.
The identification form of each CSI-IM resource is not limited in the implementation of the present invention, and may be, for example, a number, or a letter.
For example, an embodiment of the present invention further provides a possible implementation manner, as shown in fig. 10, where the method further includes:
s417, sending the channel quality indication CQI of each cooperative cell under each CSI-IM resource in at least one CSI-IM resource to the base station to which each cooperative cell belongs respectively through the serving cell in the cooperative set.
In this embodiment, the base station may obtain the CQI of each cooperative cell under each CSI-IM resource in time, and select a corresponding appropriate resource for the user equipment according to the CQI of each cooperative cell under each CSI-IM resource.
As shown in fig. 11, an embodiment of the present invention provides a user equipment, which is configured to perform the steps performed by the user equipment in the above method. The user equipment can comprise a module corresponding to the corresponding step. Illustratively, the user equipment includes:
an obtaining unit 10, configured to obtain a CSI-RS resource and at least one CSI-IM resource of CSI-IM interference measurement configured by each cooperating cell in a cooperating set;
a calculating unit 11, configured to calculate, according to the CSI-RS resource configured by each cooperative cell, interference information of each cooperative cell under at least one interference combination; wherein the interference combination is any combination of the at least one CSI-IM resource;
a first determining unit 12, configured to determine, according to interference information of each cooperative cell in at least one interference combination and downlink channel information of each cooperative cell, a channel quality indicator CQI of each cooperative cell in each interference combination.
The embodiment of the invention provides a CQI determining method, which is characterized in that a CSI-RS resource and at least one CSI-IM resource are configured for each cooperative cell in the same process according to a base station, so that user equipment can determine interference information of each cooperative cell under each interference combination according to the combination between any one CSI-IM resource configured by any one cooperative cell in a cooperative set indicated by each interference combination in at least one interference combination and any one CSI-IM resource configured by at least one cooperative cell in the cooperative set, and determine channel quality indication CQI of each cooperative cell under each interference combination in at least one interference combination according to the interference information of each cooperative cell under at least one interference combination and downlink channel information of each cooperative cell, when the CQI is measured, the CSI-RS resource and the CSI-IM resource of the same CSI process are both configured in one subframe, so that when the number of the cooperative cells is larger, the interference measurement cost of the CSI-IM resource is greatly increased along with the increase of the cooperative cells, therefore, the CSI-RS resource and at least one CSI-IM resource are configured for each cooperative cell in the same process, the interference information is multiplexed according to the interference combination to calculate the interference information so as to determine the CQI, and the cost of the CSI-IM resource can be saved when the number of the cooperative cells is larger.
In the embodiment of the invention, the CSI-RS resource configured for each cooperative cell is a precoded CSI-RS resource, and the precoded CSI-RS resource is consistent with the beam direction of the cooperative cell for sending data in the next scheduling period.
Optionally, for the first cooperation cell, the first cooperation cell is any one cooperation cell in all cooperation cells in the cooperation set.
As shown in fig. 12, the calculation unit 11 includes:
a first calculating module 1101, configured to calculate, according to CSI-RS resources configured by a first cooperating cell, interference power to the first cooperating cell under at least one interference combination of the other cooperating cells except the first cooperating cell in the cooperating set;
a second calculating module 1102, configured to calculate interference power of other cells outside the cooperative set to the first cooperative cell;
a determining module 1103, configured to determine, as interference information of the first cooperative cell under at least one interference combination, a sum of interference powers of other cooperative cells in the cooperative set except the first cooperative cell to the first cooperative cell under the at least one interference combination and interference powers of other cells in the cooperative set except the first cooperative cell to the first cooperative cell.
Optionally, as shown in fig. 13, the user equipment further includes a second determining unit 13, where the second determining unit 13 is specifically configured to:
and determining the downlink channel information of each cooperative cell according to the CSI-RS resource configured by each cooperative cell.
Optionally, the second calculating module 1102 is specifically configured to: according to the downlink channel information of the first cooperation cell, CSI-RS resources sent by the first cooperation cell on the first time-frequency resources and first reference signals received by user equipment on the first time-frequency resources, the interference information of other cells outside the cooperation set on the first cooperation cell is determined.
Optionally, the user equipment further includes an adjusting unit, where the adjusting unit is specifically configured to: acquiring the power of data transmission of each cooperative cell in the cooperative set in the next scheduling period; if the power difference exists between the power of the fourth cooperative cell for sending data in the next scheduling period and the reference signal power of the fourth cooperative cell, adjusting the reference signal power of the fourth cooperative cell; and determining the adjusted reference signal power of the fourth cooperation cell as the interference power of the fourth cooperation cell to the rest cooperation cells except the fourth cooperation cell in the cooperation set.
Optionally, the user equipment further includes a first receiving unit, where the first receiving unit is configured to: receiving first indication information sent by a serving cell in the cooperation set; the first indication information is used for indicating the user equipment to measure interference information under at least one interference combination, the first indication information includes at least one interference combination, and the interference combination includes a combination between any one CSI-IM resource configured by any one cooperative cell in a cooperative set and any one CSI-IM resource configured by at least one cooperative cell in the cooperative set.
Optionally, the user equipment further includes a first obtaining unit, a measuring unit and a first sending unit, where the first obtaining unit is configured to: acquiring a first CSI-RS resource and at least one CSI-IM resource configured for each cooperative cell in the cooperative set, wherein the first CSI-RS resource comprises a CSI-RS signal pre-configured for the current scheduling period of each cooperative cell; the CSI-RS pre-configured in the current scheduling period of different cooperative cells are configured in different CSI processes; the measurement unit is used for measuring the Channel State Information (CSI) of each cooperative cell according to the first CSI-RS resource; the CSI of one cooperative cell comprises a precoding matrix PMI and a rank indication RI of the cooperative cell; the first sending unit is configured to send the channel state information CSI of each cooperative cell to the serving cell in the cooperative set, so that the base station to which each cooperative cell in the cooperative set belongs obtains the precoded CSI-RS of each cooperative cell according to the channel state information of each cooperative cell, where the precoded CSI-RS is consistent with a beam direction in which the cooperative cell sends data in a next scheduling period.
Optionally, 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, where the user equipment 11 further includes a second receiving unit, where the second receiving unit is specifically configured to: and receiving second indication information sent by a serving cell in the coordinated set, wherein the second indication information comprises the number of each CSI-IM resource, and the second indication information is used for indicating that the signal power on at least one resource element RE in the CSI-IM resources with the same number is averaged to be used as the power of the CSI-IM resource.
Optionally, the user equipment further includes a second sending unit, where the second sending unit is specifically configured to: and sending a Channel Quality Indication (CQI) of each cooperative cell in each interference combination of at least one interference combination to a serving cell in the cooperative set.
It can be understood that the user equipment in this embodiment may correspond to the user equipment in the CQI determination method in the embodiment described above in any one of fig. 4 and fig. 6 to fig. 10, and the division and/or the function of each module in the user equipment in this embodiment are all for implementing the method flow shown in any one of fig. 4 and fig. 6 to fig. 10, and are not described herein again for brevity.
As shown in fig. 14, an embodiment of the present invention provides a base station, which is configured to perform the steps performed by the base station in the above CQI determination method. The base station may include modules corresponding to the respective steps.
Illustratively, the base station includes:
a configuration unit 1501, configured to configure a CSI-RS resource and at least one CSI-IM resource for each cooperating cell in a cooperating set;
a first sending unit 1502, configured to send first indication information to a ue, where the first indication information is used to indicate that the ue measures interference information under at least one interference combination, where the first indication information includes at least one interference combination, and the interference combination is any combination in the at least one CSI-IM resource;
a first receiving unit 1503, configured to receive a channel quality indicator CQI of each cooperating cell in the cooperating set in each of at least one interference combination, where the channel quality indicator CQI is sent by a user equipment.
In this embodiment of the present invention, the first indication information includes a combination of each cooperative cell in the cooperative set under different CSI-IM resources.
Optionally, as shown in fig. 15, the base station 15 further includes:
a second sending unit 1504, configured to send second indication information to the ue, where the second indication information includes a number of each CSI-IM resource, and the second indication information is used to instruct the ue to average signal power on at least one resource element RE in CSI-IM resources with the same number as interference of the CSI-IM resource.
Optionally, the configuration unit 1501 is further configured to: configuring a first CSI-RS resource and at least one CSI-IM resource for each cooperative cell in the cooperative set, so that the user equipment can measure the CSI of each cooperative cell according to the first CSI-RS resource.
Optionally, the base station further includes:
a second receiving unit, configured to receive, through a serving cell in the cooperation set, channel state information CSI of each of the cooperating cells, where CSI of one cooperating cell includes a precoding matrix PMI and a rank indication RI of the cooperating cell;
an obtaining unit, configured to obtain a precoded CSI-RS corresponding to each cooperative cell according to the CSI of each cooperative cell; the precoded CSI-RS of one cooperative cell is consistent with the beam direction of the cooperative cell for sending data in the next scheduling period;
and a third sending unit, configured to configure a corresponding precoded CSI-RS for each cooperative cell according to the precoded CSI-RS of each cooperative cell, so that the user equipment configures a corresponding precoded CSI-RS according to each cooperative cell, and calculates interference information of each cooperative cell under at least one interference combination.
It can be understood that the base station of this embodiment may correspond to the base station in the CQI determination method of any one of the embodiments described above in fig. 4 and fig. 6 to fig. 10, and the division and/or the function of each module in the base station of this embodiment are all for implementing the method flows shown in any one of fig. 4 and fig. 6 to fig. 10, and are not described herein again for brevity.
As shown in fig. 16, an embodiment of the present invention provides 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 a computer execution instruction, the processor 30 is connected to the memory 31 through the system bus 32, and when the user equipment runs, the processor 30 executes the computer execution instruction stored in the memory 31, so that the user equipment executes a method executed by the user equipment in the CQI determination method shown in fig. 4 and any one of fig. 6 to 10, where a specific CQI determination method may refer to the related description in the embodiment shown in fig. 4 and any one of fig. 6 to 10, and is not described herein again.
The processor 30 may be a Central Processing Unit (CPU). The processor 30 may also be other general processors, Digital Signal Processors (DSPs), Application Specific Integrated Circuits (ASICs), field-programmable gate arrays (FPGAs) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, and so on. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like.
The processor 30 may be a dedicated processor that 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 with other dedicated processing functions for the user equipment.
The memory 31 may include a volatile memory (RAM), such as a random-access memory (RAM); the memory 31 may also include a non-volatile memory (ROM), such as a read-only memory (read-only memory), a flash memory (flash memory), a hard disk (HDD) or a solid-state drive (SSD); the memory 31 may also comprise a combination of memories of the kind described above.
The system bus 32 may include a data bus, a power bus, a control bus, a signal status bus, and the like. In the present embodiment, the various buses are illustrated in FIG. 16 as system bus 32 for clarity of illustration.
The communication interface 33 may particularly be a transceiver on a user equipment. The transceiver may be a wireless transceiver. For example, the wireless transceiver may be an antenna of the user equipment or the like. The processor 30 transmits and receives data to and from other devices, such as a base station, via the communication interface 33.
By adopting the above CQI determination method, the user equipment, the base station, and the communication system according to embodiments of the present invention can configure one CSI-RS resource and at least one CSI-IM resource for each cooperating cell in the same process, so that the user can not only calculate the CSI of the channel state information in each CSI-IM resource according to the one CSI-RS resource and the at least one CSI-IM resource, but also determine the CQI of the channel quality indication in each interfering combination in at least one interfering combination according to the combination between the one CSI-IM resource of any one cooperating cell indicated in the interfering combination and the any one CSI-IM resource configured in at least one cooperating cell, because in the prior art, when measuring the CQI, the CSI-RS resource and the CSI-IM resource of the same CSI process are both configured in one subframe, therefore, when the number of the cooperative cells is larger, the cost for measuring the interference by using the CSI-IM resources is greatly increased along with the increase of the cooperative cells, so that the embodiment of the invention configures one CSI-RS resource and at least one CSI-IM resource for each cooperative cell in the same process, and multiplexes the CSI-RS resources to calculate the interference information to determine the CQI, and the cost of the CSI-IM resources can be saved when the number of the cooperative cells is larger.
In a specific implementation process, each step in the flow of the CQI determination method as described in fig. 4, fig. 6 to fig. 10 may be implemented by the processor 30 in a hardware form executing computer-executable instructions stored in the memory 31 in a software form. To avoid repetition, further description is omitted here.
The present embodiment also provides a storage medium, which may include the memory 31.
An embodiment of the present invention provides a readable medium, which includes a computer executable instruction, and when a processor of a user equipment executes the computer executable instruction, the user equipment executes the CQI determination method as described in the first aspect or any one of the optional manners of the first aspect.
As shown in fig. 17, an embodiment of the present invention provides 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 executable instructions, the processor 40 is connected to the memory 41 through the system bus 42, and when the base station is running, the processor 40 executes the computer executable instructions stored in the memory 41, so as to enable the base station to perform a method that the base station performs in the CQI determination method as shown in fig. 4 and in any one of fig. 6 to fig. 10. For a specific CQI determination method, reference may be made to the related description in the embodiments shown in fig. 4, and as shown in any one of fig. 6 to fig. 10, which is not described herein again.
An embodiment of the present invention provides a readable medium, which includes a computer executing instruction, and when a processor of a base station executes the computer executing instruction, the base station executes a method corresponding to the base station in the CQI determination method as described in any one of optional manners of fig. 4, fig. 6 and fig. 10.
The processor 40 may be a CPU. The processor 40 may also be other general purpose processors, DSPs, ASICs, FPGAs, or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, or the like. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like.
The processor 40 may be a dedicated processor that 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 chips with other dedicated processing functions for the base station.
The memory 41 may include volatile memory, such as random access memory RAM; the memory 41 may also include a nonvolatile memory such as a read only memory ROM, a flash memory, an HDD, or an SSD; the memory 41 may also comprise a combination of memories of the kind described above.
The system bus 42 may include a data bus, a power bus, a control bus, a signal status bus, and the like. For clarity of illustration in this embodiment, the various buses are illustrated in FIG. 17 as system bus 42.
The communication interface 43 may specifically be a transceiver on a base station. The transceiver may be a wireless transceiver. For example, the wireless transceiver may be an antenna of a base station or the like. The processor 40 transmits and receives data to and from other devices, such as user equipment, via the communication interface 43.
In a specific implementation process, each step of the base station in the method flow shown in any one of fig. 4, 6-10 may be implemented by executing a computer execution instruction in the form of software stored in a memory 41 by a processor 40 in the form of hardware. To avoid repetition, further description is omitted here.
An embodiment of the present invention provides a communication system, where the communication system includes a plurality of user equipments and a base station, and for a description of each user equipment in the plurality of user equipments, reference may be specifically made to the related description of the user equipment in the embodiments shown in fig. 11 to 13 and fig. 16, and for a description of the base station, reference may be specifically made to the related description of the base station in the embodiments shown in fig. 14, 15 and fig. 17, and details thereof are not repeated here.
In the communication system provided by the embodiment of the present invention, the CQI determination method described in the above embodiment of the present invention is respectively adopted by the multiple user equipments and the base station, so that the user equipments can determine the channel quality indicator CQI of each cooperative cell in each interference combination in the interference combination by using the CSI-RS resource, and thus, when the number of the cooperative cells is large, the base station does not need to configure more IMR resources for the user equipments, thereby solving the problem in the prior art that the interference measurement overhead by using the IMR is greatly increased along with the increase of the cooperative cells when the number of the cooperative cells is large.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit may 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 stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, all or part of the technical solution can be embodied in the form of a software product stored in a storage medium and including instructions for causing a computer device (which may be a personal computer, a server, or a network device) or a processor to execute all or part of the steps of the method according to the embodiments of the present invention. The storage medium is a non-transient (English) medium, comprising: flash memory, removable hard drive, read only memory, random access memory, magnetic or optical disk, and the like.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims (15)

1. A method for CQI determination, comprising:
the method comprises the steps that user equipment obtains a channel state information reference signal (CSI-RS) resource and at least one channel state information interference measurement (CSI-IM) resource configured by each cooperation cell in a cooperation set;
the user equipment calculates the interference information of each cooperative cell under at least one interference combination according to the CSI-RS resource configured by each cooperative cell; wherein the interference combination is any combination of the at least one CSI-IM resource;
and the user equipment determines the channel quality indicator CQI of each cooperative cell under each interference combination in at least one interference combination according to the interference information of each cooperative cell under at least one interference combination and the downlink channel information of each cooperative cell.
2. The method of claim 1, wherein the CSI-RS resource configured by each cooperative cell is a precoded CSI-RS resource, and the precoded CSI-RS resource is in accordance with a beam direction of the cooperative cell for transmitting data in a next scheduling period.
3. The method of claim 1, wherein for a first cooperation cell, the first cooperation cell is any one of all cooperation cells in the cooperation set;
the method for the user equipment to calculate the interference information of the first cooperative cell under at least one interference combination according to the CSI-RS resource configured by the first cooperative cell includes:
the user equipment calculates the interference power of the rest cooperative cells except the first cooperative cell in the cooperative set to the first cooperative cell under at least one interference combination according to the CSI-RS resource configured by the first cooperative cell;
the user equipment calculates the interference power of other cells except the cooperation set to the first cooperation cell;
and the user equipment determines the sum of the interference power of the rest cooperative cells except the first cooperative cell in the cooperative set to the first cooperative cell under at least one interference combination and the interference power of other cells except the cooperative set to the first cooperative cell as the interference information of the first cooperative cell under at least one interference combination.
4. The method of claim 3, further comprising:
and the user equipment determines the downlink channel information of each cooperative cell according to the CSI-RS resource configured by each cooperative cell.
5. The method of claim 4, wherein the calculating, by the UE, the interference power to the first cooperative cell by other cells outside the cooperative set comprises:
and determining interference information of other cells outside the cooperation set to the first cooperation cell according to the downlink channel information of the first cooperation cell, the CSI-RS resource sent by the first cooperation cell on the first time-frequency resource and the first reference signal received by the user equipment on the first time-frequency resource.
6. The method of claim 1, wherein before the ue determines the channel quality indicator CQI of each cooperative cell in each of the interference combinations according to the interference information of each cooperative cell in at least one of the interference combinations and the downlink channel information of each cooperative cell, the method further comprises:
the user equipment acquires the power of data sent by each cooperation cell in the cooperation set in the next scheduling period;
if the power difference exists between the power of the fourth cooperative cell for sending data in the next scheduling period and the reference signal power of the fourth cooperative cell, the user equipment adjusts the reference signal power of the fourth cooperative cell;
and the user equipment determines the adjusted reference signal power of the fourth cooperative cell as the interference power of the fourth cooperative cell to the rest cooperative cells except the fourth cooperative cell in the cooperative set.
7. The method of claim 1, further comprising:
the user equipment receives first indication information sent by a serving cell in the cooperation set; the first indication information is used for indicating the user equipment to measure interference information under at least one interference combination, the first indication information includes at least one interference combination, and the interference combination is any combination in the at least one CSI-IM resource.
8. The method according to any of claims 1-6, wherein before the UE obtains the CSI-RS resource and at least one CSI-IM resource configured by each cooperative cell in the cooperative set, the method further comprises:
the user equipment acquires a first CSI-RS resource and at least one CSI-IM resource configured by each cooperative cell in the cooperative set, wherein the first CSI-RS resource comprises a CSI-RS signal pre-configured in the current scheduling period of each cooperative cell; the CSI-RS pre-configured in the current scheduling period of different cooperative cells are configured in different CSI processes;
the user equipment measures the Channel State Information (CSI) of each cooperative cell according to the first CSI-RS resource; the CSI of one cooperative cell comprises a precoding matrix PMI and a rank indication RI of the cooperative cell;
and the user equipment sends the Channel State Information (CSI) of each cooperative cell to the serving cell in the cooperative set, so that a base station to which each cooperative cell in the cooperative set belongs respectively obtains the precoded CSI-RS of each cooperative cell according to the channel state information of each cooperative cell, wherein the precoded CSI-RS is consistent with the beam direction of the cooperative cell for sending data in the next scheduling period.
9. The method according to any of claims 1-7, wherein one CSI-IM resource comprises at least one resource element RE, wherein resource elements REs belonging to the same CSI-IM resource have the same identity, and wherein resource elements REs belonging to different CSI-IM resources have different identities; the method further comprises the following steps:
the user equipment receives second indication information sent by a serving cell in the cooperation set, wherein the second indication information comprises the number of each CSI-IM resource, and the second indication information is used for indicating that the signal power on at least one resource element RE in the CSI-IM resources with the same number is averaged to be used as the power of the CSI-IM resource.
10. The method according to any one of claims 1-7, further comprising:
and sending a Channel Quality Indication (CQI) of each cooperative cell in each interference combination of at least one interference combination to a serving cell in the cooperative set.
11. A method for determining CQI, comprising:
a 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 cooperative cell in a cooperative set;
the base station sends first indication information to user equipment; the first indication information is used for indicating the user equipment to measure interference information under at least one interference combination, the first indication information includes at least one interference combination, and the interference combination is any combination in the at least one CSI-IM resource;
and the base station receives the channel quality indication CQI of each cooperative cell in the cooperative set in each interference combination of at least one interference combination sent by the user equipment.
12. The method of claim 11, further comprising:
and sending second indication information to the user equipment, wherein the second indication information comprises the number of each CSI-IM resource, and the second indication information is used for indicating the user equipment to take the average of the signal power on at least one resource element RE in the CSI-IM resources with the same number as the power of the CSI-IM resource.
13. The method of claim 11, further comprising:
receiving Channel State Information (CSI) of each cooperative cell sent by the user equipment, wherein the CSI of one cooperative cell comprises a Precoding Matrix (PMI) and a Rank Indication (RI) of the cooperative cell;
acquiring a precoded CSI-RS corresponding to each cooperative cell according to the CSI of each cooperative cell; the precoded CSI-RS of one cooperative cell is consistent with the beam direction of the cooperative cell for sending data in the next scheduling period;
configuring a corresponding precoded CSI-RS for each cooperative cell according to the precoded CSI-RS of each cooperative cell, so that the user equipment calculates the interference information of each cooperative cell under at least one interference combination according to the corresponding precoded CSI-RS configured for each cooperative cell.
14. A user device comprising a processor, a memory, a system bus, and a communication interface;
the memory is used for storing computer-executable instructions, the processor is connected with the memory through the system bus, and when the user equipment runs, the processor executes the computer-executable instructions stored by the memory to enable the user equipment to execute the CQI determination method according to any one of claims 1 to 10.
15. A base station, comprising: a processor, a memory, a system bus, and a communication interface;
the memory is used for storing computer-executable instructions, the processor is connected with the memory through the system bus, when the base station runs, the processor executes the computer-executable instructions stored by the memory, so that the base station executes the CQI determination method according to any one of claims 11 to 13.
CN201610323533.2A 2016-05-16 2016-05-16 CQI determination method, user equipment and base station Active CN107395332B (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
CN201610323533.2A CN107395332B (en) 2016-05-16 2016-05-16 CQI determination method, user equipment and base station
PCT/CN2017/084525 WO2017198142A1 (en) 2016-05-16 2017-05-16 Cqi determination method, user equipment and base station

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201610323533.2A CN107395332B (en) 2016-05-16 2016-05-16 CQI determination method, user equipment and base station

Publications (2)

Publication Number Publication Date
CN107395332A CN107395332A (en) 2017-11-24
CN107395332B true CN107395332B (en) 2020-01-10

Family

ID=60325694

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201610323533.2A Active CN107395332B (en) 2016-05-16 2016-05-16 CQI determination method, user equipment and base station

Country Status (2)

Country Link
CN (1) CN107395332B (en)
WO (1) WO2017198142A1 (en)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110034872B (en) * 2018-01-11 2021-09-07 维沃移动通信有限公司 Association relation indication method, association relation determination method and related equipment of resources and QCL
CN110034788B (en) * 2018-01-12 2021-12-28 华为技术有限公司 Method and device for measuring channel state information
CN110149645B (en) * 2019-04-08 2022-11-15 浙江吉利控股集团有限公司 Method and device for measuring wireless channel interference
CN112004235B (en) * 2019-05-27 2021-07-16 华为技术有限公司 Method and device for adjusting received beam
CN112911651B (en) * 2019-12-04 2022-11-08 大唐移动通信设备有限公司 Physical transmission rate adjusting method and system

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102487308A (en) * 2010-12-06 2012-06-06 中兴通讯股份有限公司 Feedback method of channel quality index (CQI) and apparatus thereof
CN102821473A (en) * 2011-06-09 2012-12-12 中兴通讯股份有限公司 Method and system for cooperative scheduling of CoMP (coordinated multipoint transmission) terminal
CN102883341A (en) * 2011-07-11 2013-01-16 华为技术有限公司 Measuring method of channel information and relevant device
CN103688474A (en) * 2013-09-27 2014-03-26 华为技术有限公司 Communication method, base station, and user equipment
CN103718635A (en) * 2013-03-14 2014-04-09 华为技术有限公司 Method used for scheduling user device and base station

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103516494B (en) * 2012-06-21 2016-12-21 华为技术有限公司 Channel information feedback method and subscriber equipment
CN105099611A (en) * 2014-05-16 2015-11-25 华为技术有限公司 Method of determining channel quality indicator in coordinative multiple point transmission, and base station

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102487308A (en) * 2010-12-06 2012-06-06 中兴通讯股份有限公司 Feedback method of channel quality index (CQI) and apparatus thereof
CN102821473A (en) * 2011-06-09 2012-12-12 中兴通讯股份有限公司 Method and system for cooperative scheduling of CoMP (coordinated multipoint transmission) terminal
CN102883341A (en) * 2011-07-11 2013-01-16 华为技术有限公司 Measuring method of channel information and relevant device
CN103718635A (en) * 2013-03-14 2014-04-09 华为技术有限公司 Method used for scheduling user device and base station
CN103688474A (en) * 2013-09-27 2014-03-26 华为技术有限公司 Communication method, base station, and user equipment

Also Published As

Publication number Publication date
CN107395332A (en) 2017-11-24
WO2017198142A1 (en) 2017-11-23

Similar Documents

Publication Publication Date Title
US11936584B2 (en) System and method for control signaling
US11606800B2 (en) Wireless device, a network node and methods therein for reporting channel state information (CSI) in a radio communications network
US10771118B2 (en) Channel state measurement method and apparatus
JP5662588B2 (en) Channel state information feedback method and apparatus in multi-node system
US20190349103A1 (en) Method Used for Wireless Communication and Apparatus
CN107395332B (en) CQI determination method, user equipment and base station
US20130310019A1 (en) Cell range extension for cooperative multipoint
JP2022517205A (en) Instruction method, device and communication system for the purpose of measuring channel state information
WO2018059478A1 (en) Csi measurement method and apparatus
EP3688880A1 (en) Downlink pilot assignment in massive mimo
US11817929B2 (en) Channel state information measurement method and apparatus and network side device
US20230146581A1 (en) Network Node, Terminal Device and Methods Therein for Data Transmission using Beamforming
US10419097B2 (en) CSI receiving method and access network device
CN113994601A (en) Adaptive CSI reporting and PRB bundling in AAS
CN114759964A (en) Information processing method and device and network side equipment
US20210234730A1 (en) Methods and Devices for Channel Estimation
JP7216813B2 (en) Method and apparatus for determining channel state information
EP3158660B1 (en) A network node and a method therein for configuring interference signal transmissions from transmission points in a radio communications network
CN116094670A (en) Signal processing method and device

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
GR01 Patent grant
GR01 Patent grant