CN114257359B - CSI-RS measurement method and device - Google Patents

CSI-RS measurement method and device Download PDF

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Publication number
CN114257359B
CN114257359B CN202011018143.7A CN202011018143A CN114257359B CN 114257359 B CN114257359 B CN 114257359B CN 202011018143 A CN202011018143 A CN 202011018143A CN 114257359 B CN114257359 B CN 114257359B
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target
csi
terminal
coverage area
determining
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CN114257359A (en
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李全琼
王丽萍
肖鲜贵
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Datang Mobile Communications Equipment Co Ltd
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Datang Mobile Communications Equipment Co Ltd
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0048—Allocation of pilot signals, i.e. of signals known to the receiver
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/0413—MIMO systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/0413—MIMO systems
    • H04B7/0456—Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting
    • 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D30/00—Reducing energy consumption in communication networks
    • Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks

Abstract

The embodiment of the application provides a CSI-RS measurement method and device. The method is applied to access network equipment, and comprises the following steps: determining a target location group corresponding to a resource indication (CSI-RS) of a target channel state information reference signal to be triggered; determining a target terminal of a target location group; the target location group corresponds to a target coverage area, and the target terminal is located in the target coverage area; and triggering the target terminal to measure the target CSI-RS. The embodiment of the application solves the problem that in the prior art, the performance of MIMO is limited due to the limitation of the terminal capacity.

Description

CSI-RS measurement method and device
Technical Field
The present disclosure relates to the field of mobile communications technologies, and in particular, to a CSI-RS measurement method and apparatus.
Background
In a multiple input and output (Multiple Input Multiple Output, MIMO) system, codebook shaping is a common shaping technique, and many enhancements are made to the design of a MIMO Codebook (Codebook) in a New Radio (NR) protocol, however, due to the limitation of the processing capability of a terminal, the Codebook modes already supported in many protocols cannot be used. Since the number of users in a cell can reach hundreds or even thousands, although the channel state information reference signals (Channel State Information-Reference Signals, CSI-RS) defined by the protocol are configured as parameters at the user level, this overhead amount base station is not affordable if a set of 4-port CSI-RS resources is allocated to each user. In the prior art, therefore, codebook shaping schemes are typically implemented based on cell-level CSI-RS.
Based on downlink MIMO of a cell-level codebook, a base station configures a cell-level CSI-RS, a terminal adopts the CSI-RS to measure parameters such as CSI-RS resource Indication (CSI-RS Resource Indication, CRI), rank Indication (RI), precoding matrix Indication (Precoding Matrix Indicator, PMI), channel quality Indication (Channel Quality Indicator, CQI) and the like, corresponding information is fed back to the base station, and the base station utilizes the CSI-RS fed back by the terminal to send downlink MIMO. However, due to limitations of processing capacity, power consumption and other aspects, the capability of CSI measurement is limited, and at present, a terminal with stronger processing capacity supports CSI-RS (the sum of ports of all CSI-RS resources) with at most 16 ports; taking 8 ports as an example, the terminal supports at most two sets of 8 ports and 1 set of 16 ports. The number of antennas of the macro station system of the NR is generally 32, 64 or more, and the number of antennas is limited by the capability of the terminal, so that the beam design of the CSI-RS cannot fully exert the advantages of multiple antennas of the MIMO, and the performance of the MIMO is limited.
Disclosure of Invention
The embodiment of the application provides a CSI-RS measurement method and device, which are used for solving the problem that in the prior art, the performance of MIMO is limited due to the limitation of the terminal capacity.
In one aspect, an embodiment of the present application provides a CSI-RS measurement method, applied to an access network device, where the method includes:
determining a target location group corresponding to a resource indication (CSI-RS) of a target channel state information reference signal to be triggered;
determining a target terminal of a target location group; the target location group corresponds to a target coverage area, and the target terminal is located in the target coverage area;
and triggering the target terminal to measure the target CSI-RS.
On the other hand, the embodiment of the application also provides a CSI-RS measurement device, which is applied to access network equipment, and the device comprises:
the location group determining module is used for determining a target location group corresponding to the resource indication CSI-RS of the target channel state information reference signal to be triggered;
the terminal determining module is used for determining a target terminal of the target location group; the target location group corresponds to a target coverage area, and the target terminal is located in the target coverage area;
and the measurement triggering module is used for triggering the target terminal to measure the target CSI-RS.
In yet another aspect, embodiments of the present application further provide an electronic device including a memory, a processor, and a computer program stored on the memory and executable on the processor, the processor implementing the steps in the CSI-RS measurement method as described above when the computer program is executed.
In yet another aspect, embodiments of the present application also provide a computer-readable storage medium having stored thereon a computer program which, when executed by a processor, implements the steps in a CSI-RS measurement method as described above.
In the embodiment of the application, a target location group corresponding to a target CSI-RS to be triggered is determined; determining a target terminal of a target location group; the target location group corresponds to a target coverage area, and the target terminal is located in the target coverage area; the target terminal is triggered to measure the target CSI-RS, only one set of aperiodic CSI resources can be configured for each terminal, the sum of ports of the CSI-RS resources cannot be increased along with the number of beams, the receiving capability of the terminal cannot limit the performance of MIMO, and the multi-beam performance of the MIMO system can be fully exerted.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the description of the embodiments of the present application will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a step flowchart of a CSI-RS measurement method provided in an embodiment of the present application;
FIG. 2 is a flow chart of steps of an example of an embodiment of the present application;
fig. 3 is a block diagram of a CSI-RS measurement apparatus according to an embodiment of the present application;
fig. 4 is a block diagram of an electronic device according to an embodiment of the present application.
Detailed Description
The following description of the embodiments of the present application will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are some, but not all, of the embodiments of the present application. All other embodiments, which can be made by one of ordinary skill in the art based on the embodiments herein without making any inventive effort, are intended to be within the scope of the present application.
It should be appreciated that reference throughout this specification to "one embodiment" or "an embodiment" means that a particular feature, structure or characteristic described in connection with the embodiment is included in at least one embodiment of the present application. Thus, the appearances of the phrases "in one embodiment" or "in an embodiment" in various places throughout this specification are not necessarily all referring to the same embodiment. Furthermore, the particular features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.
In various embodiments of the present application, it should be understood that the sequence numbers of the following processes do not mean the order of execution, and the order of execution of the processes should be determined by the functions and internal logic thereof, and should not constitute any limitation on the implementation process of the embodiments of the present application. The terms first, second and the like in the description and in the claims, are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate such that embodiments of the present application may be implemented in sequences other than those illustrated or described herein. Furthermore, in the description and claims, "and/or" means at least one of the connected objects, and the character "/", generally means that the associated object is an "or" relationship.
In the examples provided herein, it should be understood that "B corresponding to a" means that B is associated with a from which B may be determined. It should also be understood that determining B from a does not mean determining B from a alone, but may also determine B from a and/or other information.
Fig. 1 shows a flow chart of a CSI-RS measurement method according to an embodiment of the present application.
As shown in fig. 1, an embodiment of the present application provides a CSI-RS measurement method, where the method may be applied to an access network device, and the access network device may be a Base Station (BS), which is a device deployed in an access network to provide a wireless communication function for a UE. The base stations may include various forms of macro base stations, micro base stations, relay stations, access points, and the like. In systems employing different radio access technologies, the names of base station enabled devices may vary, for example in 5GNR systems, called gndeb or gNB. As communication technology evolves, the name "base station" may change. For convenience of description, in the embodiment of the present invention, the above-mentioned devices for providing wireless communication functions for UEs are collectively referred to as access network devices. For convenience of description, in the embodiments of the present application, the access network device is used as a base station to describe the description.
Step 101, determining a target location group corresponding to a resource indication CSI-RS of a target channel state information reference signal to be triggered.
In an NR MIMO system, the codebook is enhanced in the protocol as follows: the single CSI-RS resource ports support 1, 2, 4, 8, 12, 16, 24 and 32 ports, and support up to 192 CSI-RS resources, and a single panel (single panel) and a multiple panel (multiple panel) of a mode of a codebook; wherein single panel supports different codebook modes, etc.
When a base station prepares to send a CSI-RS signal, determining a target location group corresponding to the target CSI-RS signal; different coverage areas of cells are divided into different direction groups in advance at a base station side, and antennas are formed into beams with smaller granularity through the direction groups in the horizontal dimension and the vertical dimension. Such as a cell wide coverage scenario of 120 degrees, the users may be divided into 8 groups only in the horizontal direction without grouping in the vertical direction, each group covering 15 degrees for a total of 8 beams; for high-rise scenes, there may be more vertical direction azimuth groups, less horizontal beams, such as every 6 degrees vertically (4 total groups), 60 degrees horizontally (2 total groups), 8 total beams. In this way, the coverage area of the cell is divided into at least two sections, all terminals in each section are used as one location group, when the target CSI-RS is triggered, the target location group of the coverage area is determined according to the coverage area corresponding to the target CSI-RS, and then the terminals in the target location group are determined. If the number of users in certain coverage areas is relatively large, the CSI-RS transmission in the direction and the CSI-RS measurement of the corresponding terminal can be triggered for multiple times, and the multiple triggers can be triggered for multiple directions.
The CSI-RS in the embodiment of the present application is an aperiodic CSI-RS. In particular, in the time domain, the CSI-RS may be configured as periodic transmission, semi-persistent transmission, or aperiodic transmission. For periodic transmission, the CSI-RS is repeated every minimum of 4 slots, and a maximum of 640 slots is repeated. For semi-persistent transmission, the CSI-RS will also configure a transmission period, and whether or not to actually transmit depends on explicit activation of the medium access control layer (Media Access Control, MAC) control source, and once activated, will continue periodic transmission until an explicit deactivation command is received. For aperiodic transmission, the network side does not configure a transmission period, but explicitly informs every CSI-RS transmission through signaling.
Step 102, determining a target terminal of a target location group; the target location group corresponds to a target coverage area, and the target terminal is located in the target coverage area;
after determining the target location group corresponding to the target CSI-RS signal, the base station further determines the terminal in the target location group, and optionally, the base station may determine the location information of the terminal according to the azimuth information of the terminal, and further determine the target terminal in the target location group.
And step 103, triggering the target terminal to measure the target CSI-RS.
After determining a target terminal in a target location group, triggering the target terminal to measure a target CSI-RS, namely triggering all terminals in the target location group to measure the CSI-RS according to the target CSI-RS. In this way, when the base station determines that the target location group of the target CSI-RS exists in the terminal users, the base station triggers the measurement of the aperiodic CSI-RS of the group of users; for each CSI-RS resource, not only one terminal is used, but a group of terminals are used, so that the CSI-RS resource is saved; meanwhile, the loss caused by insufficient number of beams and insufficient fineness of the beams due to the terminal capability of the cell-level CSI-RS is avoided.
Specifically, taking an example of supporting 8 ports, in the prior art, a terminal supports at most two sets of 8 ports, that is, two CSI beams, so that the multi-beam performance of the large-scale MIMO system cannot be exerted, and the downlink rate cannot be higher. And more CSI beams are set, so that the method has more advantages in RI and PMI. In the embodiment of the present application, each terminal only needs to configure one aperiodic CSI-RS resource to avoid being limited by the capability of the terminal, and the number of CSI-RS beams of the base station can be up to N (N can be 12 or more), which is enough to match the beam requirements of MIMO multiple antennas. Only one set of aperiodic CSI resources is configured for each terminal, and when the terminals are positioned in different directions, the CSI-RS measurement of the user is triggered through the CSI-RS beam corresponding to Fang Weizu to which the user belongs, so that the beam of the CSI can be fine enough; when the aperiodic CSI resource includes N beams, for the terminal, the total port number is only the port number of the aperiodic CSI resource, and not the port number of the N-th CSI; the port number does not increase with the number of beams, so that the performance of the MIMO system is not limited by the total port number in the terminal receiving capacity, and the multi-beam performance of the MIMO system can be fully exerted.
In the embodiment of the application, a target location group corresponding to a target CSI-RS to be triggered is determined; determining a target terminal of a target location group; the target location group corresponds to a target coverage area, and the target terminal is located in the target coverage area; the target terminal is triggered to measure the target CSI-RS, only one set of aperiodic CSI resources can be configured for each terminal, the sum of ports of the CSI-RS resources cannot be increased along with the number of beams, the receiving capability of the terminal cannot limit the performance of MIMO, and the multi-beam performance of the MIMO system can be fully exerted. The embodiment of the application solves the problem that in the prior art, the performance of MIMO is limited due to the limitation of the terminal capacity.
In an alternative embodiment, the determining the target terminal of the target location group includes:
acquiring an uplink channel sounding reference signal SRS sent by a terminal;
determining a first coverage area corresponding to the terminal according to the SRS;
and determining the first coverage area as a target terminal of the target coverage area.
The interception reference signal (Sounding Reference Signal, SRS) is periodically reported to the base station by the terminal, and is used for the base station to estimate the uplink channel information and perform downlink beamforming. When a terminal accesses a cell of a base station in a random access or cell switching mode, the terminal periodically reports an SRS to the base station, and the base station calculates a signal-to-interference-plus-noise ratio (Signal to Interference plus Noise Ratio, SINR) or the like of an uplink channel using the SRS as an estimation of uplink channel quality and channel selection. In the embodiment of the application, the base station determines the spatial azimuth of the terminal according to the SRS, wherein the spatial azimuth is the first coverage area of each terminal; after determining the first coverage area of each terminal, selecting the terminal with the first coverage area being the target coverage area as the target terminal.
In the embodiment of the present application, in the process of determining the first coverage area corresponding to the terminal, whether the SRS is transmitted in turn and the number of ports are not limited, no additional SRS resource needs to be configured, the existing SRS resource is only needed to be utilized, and in the process of beamforming, the SRS transmission capability of the terminal is not limited.
In an optional embodiment, the determining, according to the SRS, a first coverage area corresponding to the terminal includes:
determining the direction angle of the terminal according to the SRS; the arrival angle refers to a measure of the propagation direction of wave radiation reaching the observation point, i.e., the angle between the wave ray and a preset positive direction. The direction angles include at least one of a horizontal direction angle of arrival (Azimuth angle Of Departure, AOD) and a vertical direction angle of arrival (Zenithangle Of Departure, ZOD); in the process of calculating the arrival angle, the array response vector of the antenna array and the channel estimation correlation matrix can be utilized to calculate the angle power spectrum, and the position with the maximum angle power spectrum is selected as the angle of the terminal; wherein, the channel estimation correlation matrix can be calculated by SRS.
According to a preset corresponding relation, determining a coverage area corresponding to the direction angle, wherein the coverage area is a first coverage area corresponding to the terminal; the corresponding relation comprises at least two coverage areas, and each coverage area corresponds to a continuous direction angle range. For example, each beam corresponds to a horizontal coverage area [ a, b ], and if the AOA of the terminal is between [ a, b ], the first coverage area of the terminal is the coverage area of the beam.
The coverage may be a one-dimensional planar coverage, such as a horizontal coverage or a vertical coverage, dividing the coverage space into a plurality of coverage areas in a horizontal plane or a vertical plane; the coverage area may also be a two-dimensional coverage area, for example, each beam corresponds to a horizontal coverage area [ a, b ] and a vertical coverage area [ c, d ], and if the AOA of the terminal is between [ a, b ], ZOD is between [ c, d ], the terminal belongs to the beam, and the first coverage area of the terminal is the coverage area of the beam.
In an alternative embodiment, after the triggering the target terminal to measure the target CSI-RS, the method includes:
receiving CSI measurement information reported by the target terminal;
determining a first precoding PMI matrix of the target terminal according to the CSI measurement information; determining a second PMI matrix corresponding to the target CSI-RS;
and determining the product of the first PMI matrix and the second PMI matrix as a downlink transmission matrix of the target terminal.
The CSI measurement information includes CQI (Channel Quality Indicator), PMI, precoding type indication (Precoding Type Indicator, PTI), RI, and the like.
Optionally, the downlink RI and the downlink PMI may be CSI measurement information directly reported by the terminal, or parameters corrected by the base station according to the CSI measurement information, for example, the base station calculates downlink spectrum efficiency by combining RI and CQI reported by the terminal; if the spectrum efficiency is too low, adjusting RI downward;
or, using the PMI reported by the terminal to obtain a first horizontal direction Arrival Angle X of the terminal, calculating an Arrival Angle (AOA) according to SRS, correcting X according to AOA to obtain a corrected second horizontal direction Arrival Angle X2, and calculating PMI1 according to X2 in the reverse direction to obtain a new PMI matrix.
When the target location has a terminal, the base station can trigger the terminal to report the aperiodic CSI-RS by adopting downlink control information (Downlink Control Information, DCI), and the base station carries aperiodic CSI-RS measurement report indication information in the DCI and Zero Power reference signals (Zero Power CSI-RS, ZP) corresponding to all scheduling terminals at the moment; specifically, if a physical direct channel (Physical Sidelink Discovery Channel, PSDCH) scheduled for one terminal contains CSI-RS resource elements configured for other terminals, the terminal needs to skip the CSI-RS resource elements. The terminal does not know which resource elements it needs to skip, but the zero-power CSI-RS is used to mark all the resource elements that the terminal needs to skip as zero-power CSI-RS, the terminal will consider these resource elements as invalid, and the direct skip does not perform any processing.
After triggering a target terminal of a target location group to perform CSI measurement, a base station receives CSI measurement information reported by the target terminal; determining a first precoding PMI matrix omega 1 of the target terminal according to the CSI measurement information; determining a second PMI matrix omega 2 corresponding to the target CSI-RS; and then determining the product of the first PMI matrix omega 1 and the second PMI matrix omega 2 as a downlink transmission matrix of the target terminal, wherein the downlink transmission matrix is used for transmitting downlink service data, and realizing adjustment of parameters of basic units of a phased array, so that signals at certain angles obtain constructive interference, signals at other angles obtain destructive interference, and beam forming is completed.
Optionally, the method further comprises:
and detecting an access terminal accessed to the coverage area of the access network equipment, and configuring aperiodic CSI-RS and a zero-power reference signal ZP corresponding to the aperiodic CSI-RS for the access terminal.
When a terminal is accessed to a cell of a base station in a random access or cell switching mode, the base station detects the terminal access and configures an aperiodic CSI-RS (channel state information-reference signal) and a zero-power reference signal ZP corresponding to the aperiodic CSI-RS for the terminal; the number of the aperiodic CSI-RS resources can be one or a plurality of the aperiodic CSI-RS resources and can be only in the UE capacity range; for example, if the maximum port number supported by the terminal is 16, when the base station configures high-layer signaling for the terminal, the total port number of each configured CSI resource does not exceed 16, for example, two sets of 8-port CSI resources may be configured in each configuration, or only one set of 8-port resources may be configured; each CSI resource corresponds to one beam, and the number of resources in each configuration may determine the number of beams that may trigger the aperiodic measurement at this time, i.e., the number of groups of the target set of locations.
That is, the group number of the target direction group, i.e., the aperiodic CSI resource, includes the number of beams; the number of the wave beams can be determined according to the antenna, the array type, the actual CSI-RS port number and the like of the base station; for example, the horizontal coverage area and the vertical coverage area of each CSI beam are determined according to the antenna spacing of the base station, the pattern of the array and the port number of the CSI, and then the number which can be included in the CSI resource is determined according to the coverage area. Optionally, the number of beams is approximately equal to the coverage of the total three-dimensional space of the base station divided by the coverage of the three-dimensional space of each beam.
As an example, referring to fig. 2, fig. 2 shows an application process of the CSI-RS measurement method provided in the embodiment of the present application, and mainly includes the following steps:
in step 201, when a terminal is accessed, a base station configures an aperiodic CSI-RS for the terminal.
When a terminal is accessed, a base station configures a set of aperiodic CSI-RS and an aperiodic ZP corresponding to the CSI-RS resource for the terminal.
In step 202, the terminal transmits SRS to the base station.
In step 203, the base station determines parameters such as AOD and ZOD according to SRS.
The base station uses the uplink SRS to perform uplink AOD and ZOD measurements.
Step 204, determining the location group to which the terminal belongs.
And determining the location group of the terminal according to the AOD and the ZOD.
In step 205, reporting of aperiodic CSI is triggered.
And triggering all terminals in the target location group, and carrying out CSI-RS measurement according to the target CSI-RS.
Step 206, determining a RI, PMI, CSI beam of the user downlink;
step 207, calculating a downlink weight;
the downlink weight is the element in the downlink transmission matrix; determining a first PMI matrix omega 1 of a terminal and determining a second PMI matrix omega 2 corresponding to a target CSI-RS; and then determining the product of the first PMI matrix omega 1 and the second PMI matrix omega 2 as a downlink transmission matrix of the target terminal.
Step 208, downlink transmission.
And sending downlink service data according to the downlink matrix.
Step 209, downlink reception of the terminal;
specifically, step 205 includes steps 210 through 213.
Step 210, the base station performs scheduling;
step 211, if the present party has an end user.
Step 212, triggering all users in the present bit group to report aperiodic CSI and ZP of all other scheduled users in the present slot (slot).
In step 213, the terminal performs measurement of aperiodic CSI.
In this example, under the condition that the terminal capability is limited, a codebook enhancement scheme is provided, and the base station measures and selects the MIMO beam used by the terminal, so as to improve the performance of downlink MIMO.
In the embodiment of the application, a target location group corresponding to a target CSI-RS to be triggered is determined; determining a target terminal of a target location group; the target location group corresponds to a target coverage area, and the target terminal is located in the target coverage area; the target terminal is triggered to measure the target CSI-RS, only one set of aperiodic CSI resources can be configured for each terminal, the sum of ports of the CSI-RS resources cannot be increased along with the number of beams, the receiving capability of the terminal cannot limit the performance of MIMO, and the multi-beam performance of the MIMO system can be fully exerted.
Having described the CSI-RS measurement method provided by the embodiments of the present application, the CSI-RS measurement device provided by the embodiments of the present application will be described below with reference to the accompanying drawings.
Referring to fig. 3, the embodiment of the present application further provides a CSI-RS measurement apparatus, which is applied to an access network device, where the access network device may be a base station, and the base station is an apparatus deployed in an access network to provide a wireless communication function for a UE. The base stations may include various forms of macro base stations, micro base stations, relay stations, access points, and the like. In systems employing different radio access technologies, the names of base station capable devices may vary, for example in 5G NR systems, called gndeb or gNB. As communication technology evolves, the name "base station" may change. For convenience of description, in the embodiment of the present invention, the above-mentioned devices for providing wireless communication functions for UEs are collectively referred to as access network devices. For convenience of description, in the embodiments of the present application, the access network device is used as a base station to describe the description.
The device comprises:
the location group determining module 301 is configured to determine a target location group corresponding to a resource indicator CSI-RS of a target channel state information reference signal to be triggered.
In an NR MIMO system, the codebook is enhanced in the protocol as follows: the single CSI-RS resource ports support 1, 2, 4, 8, 12, 16, 24 and 32 ports, and support up to 192 CSI-RS resources, and a single panel (single panel) and a multiple panel (multiple panel) of a mode of a codebook; wherein single panel supports different codebook modes, etc.
When a base station prepares to send a CSI-RS signal, determining a target location group corresponding to the target CSI-RS signal; different coverage areas of cells are divided into different direction groups in advance at a base station side, and antennas are formed into beams with smaller granularity through the direction groups in the horizontal dimension and the vertical dimension. Such as a cell wide coverage scenario of 120 degrees, the users may be divided into 8 groups in the horizontal direction only, with the groups covering 15 degrees for a total of 8 beams, without locating groups in the vertical direction; for high-rise scenes, there may be more vertical direction azimuth groups, less horizontal beams, such as every 6 degrees vertically (4 total groups), 60 degrees horizontally (2 total groups), 8 total beams. In this way, the coverage area of the cell is divided into at least two sections, all terminals in each section are used as one location group, when the target CSI-RS is triggered, the target location group of the coverage area is determined according to the coverage area corresponding to the target CSI-RS, and then the terminals in the target location group are determined.
The CSI-RS in the embodiment of the present application is an aperiodic CSI-RS. In particular, in the time domain, the CSI-RS may be configured as periodic transmission, semi-persistent transmission, or aperiodic transmission. For periodic transmission, the CSI-RS is repeated every minimum of 4 slots, and a maximum of 640 slots is repeated. For semi-persistent transmission, the CSI-RS will also configure a transmission period, and whether or not to actually transmit depends on explicit activation of the MAC layer control source, and once activated, will continue to periodically transmit until an explicit deactivation command is received. For aperiodic transmission, the network side does not configure a transmission period, but explicitly informs every CSI-RS transmission through signaling.
A terminal determining module 302, configured to determine a target terminal of the target location group; the target location group corresponds to a target coverage area, and the target terminal is located in the target coverage area.
After determining the target location group corresponding to the target CSI-RS signal, the base station further determines the terminal in the target location group, and optionally, the base station may determine the location information of the terminal according to the azimuth information of the terminal, and further determine the target terminal in the target location group.
And the measurement triggering module 303 is configured to trigger the target terminal to measure the target CSI-RS.
After determining a target terminal in a target location group, triggering the target terminal to measure a target CSI-RS, namely triggering all terminals in the target location group to measure the CSI-RS according to the target CSI-RS. In this way, when the base station determines that the target location group of the target CSI-RS exists in the terminal users, the base station triggers the measurement of the aperiodic CSI-RS of the group of users; for each CSI-RS resource, not only one terminal is used, but a group of terminals are used, so that the CSI-RS resource is saved; meanwhile, the loss caused by insufficient number of beams and insufficient fineness of the beams due to the terminal capability of the cell-level CSI-RS is avoided.
Specifically, taking an example of supporting 8 ports, in the prior art, a terminal supports at most two sets of 8 ports, that is, two CSI beams, so that the multi-beam performance of the large-scale MIMO system cannot be exerted, and the downlink rate cannot be higher. And more CSI beams are set, so that the method has more advantages in RI and PMI. In the embodiment of the present application, each terminal only needs to configure one aperiodic CSI-RS resource to avoid being limited by the capability of the terminal, and the number of CSI-RS beams of the base station can be up to N (N can be 12 or more), which is enough to match the beam requirements of MIMO multiple antennas. Only one set of aperiodic CSI resources is configured for each terminal, and when the terminals are positioned in different directions, the CSI-RS measurement of the user is triggered through the CSI-RS beam corresponding to Fang Weizu to which the user belongs, so that the beam of the CSI can be fine enough; when the aperiodic CSI resource includes N beams, for the terminal, the total port number is only the port number of the aperiodic CSI resource, and not the port number of the N-th CSI; the port number does not increase with the number of beams, so that the performance of the MIMO system is not limited by the total port number in the terminal receiving capacity, and the multi-beam performance of the MIMO system can be fully exerted.
In the embodiment of the present application, the azimuth group determining module 301 determines a target azimuth group corresponding to a target CSI-RS to be triggered; the terminal determining module 302 determines a target terminal of the target location group; the target location group corresponds to a target coverage area, and the target terminal is located in the target coverage area; the measurement triggering module 303 triggers the target terminal to measure the target CSI-RS, only one set of aperiodic CSI resources can be configured for each terminal, the sum of ports of the CSI-RS resources cannot be increased along with the number of beams, the receiving capability of the terminal cannot limit the performance of MIMO, and the multi-beam performance of the MIMO system can be fully exerted. The embodiment of the application solves the problem that in the prior art, the performance of MIMO is limited due to the limitation of the terminal capacity.
Optionally, in an embodiment of the present application, the terminal determining module 302 includes:
an acquisition sub-module, configured to acquire an uplink channel sounding reference signal SRS sent by a terminal;
a range determination submodule, configured to determine, according to the SRS, a first coverage area corresponding to the terminal;
and the terminal determination submodule is used for determining the first coverage area as a target terminal of the target coverage area.
Optionally, in an embodiment of the present application, the range determining submodule is configured to:
determining the direction angle of the terminal according to the SRS; the direction angle includes at least one of a horizontal direction arrival angle AOD and a vertical direction arrival angle ZOD;
according to a preset corresponding relation, determining a coverage area corresponding to the direction angle, wherein the coverage area is a first coverage area corresponding to the terminal; the corresponding relation comprises at least two coverage areas, and each coverage area corresponds to a continuous direction angle range.
Optionally, in an embodiment of the present application, the apparatus includes:
the information receiving module is used for receiving the CSI measurement information reported by the target terminal;
a first matrix determining module, configured to determine a first precoding PMI matrix of the target terminal according to the CSI measurement information; determining a second PMI matrix corresponding to the target CSI-RS;
and the second matrix determining module is used for determining the product of the first PMI matrix and the second PMI matrix as a downlink transmission matrix of the target terminal.
Optionally, in an embodiment of the present application, the apparatus further includes:
and the configuration module is used for detecting an access terminal accessed to the coverage area of the access network equipment and configuring aperiodic CSI-RS and zero-power reference signals ZP corresponding to the aperiodic CSI-RS for the access terminal.
The CSI-RS measurement apparatus provided in the embodiment of the present application can implement each process implemented at the base station side in the method embodiment of fig. 1 to 2, and in order to avoid repetition, a description is omitted here.
In the embodiment of the present application, the azimuth group determining module 301 determines a target azimuth group corresponding to a target CSI-RS to be triggered; the terminal determining module 302 determines a target terminal of the target location group; the target location group corresponds to a target coverage area, and the target terminal is located in the target coverage area; the measurement triggering module 303 triggers the target terminal to measure the target CSI-RS, only one set of aperiodic CSI resources can be configured for each terminal, the sum of ports of the CSI-RS resources cannot be increased along with the number of beams, the receiving capability of the terminal cannot limit the performance of MIMO, and the multi-beam performance of the MIMO system can be fully exerted.
In another aspect, an embodiment of the present application further provides an electronic device, including a memory, a processor, a bus, and a computer program stored on the memory and executable on the processor, where the processor implements the steps in the CSI-RS measurement method described above when executing the program.
For example, fig. 4 shows a schematic physical structure of an electronic device.
As shown in fig. 4, the electronic device may include: processor 410, communication interface (Communications Interface) 420, memory 430 and communication bus 440, wherein processor 410, communication interface 420 and memory 430 communicate with each other via communication bus 440. The processor 410 may call logic instructions in the memory 430 to perform the following method:
determining a target location group corresponding to a resource indication (CSI-RS) of a target channel state information reference signal to be triggered;
determining a target terminal of a target location group; the target location group corresponds to a target coverage area, and the target terminal is located in the target coverage area;
and triggering the target terminal to measure the target CSI-RS.
Further, the logic instructions in the memory 430 described above may be implemented in the form of software functional units and may be stored in a computer-readable storage medium when sold or used as a stand-alone product. Based on such understanding, the technical solution of the present application may be embodied essentially or in a part contributing to the prior art or in a part of the technical solution, in the form of a software product stored in a storage medium, including several instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the methods described in the embodiments of the present application. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a random access Memory (RAM, random AccessMemory), a magnetic disk, or an optical disk, or other various media capable of storing program codes.
In still another aspect, embodiments of the present application further provide a computer readable storage medium having stored thereon a computer program, which when executed by a processor is implemented to perform the CSI-RS measurement method provided in the above embodiments, for example, including:
determining a target location group corresponding to a resource indication (CSI-RS) of a target channel state information reference signal to be triggered;
determining a target terminal of a target location group; the target location group corresponds to a target coverage area, and the target terminal is located in the target coverage area;
and triggering the target terminal to measure the target CSI-RS.
The apparatus embodiments described above are merely illustrative, wherein the elements illustrated as separate elements may or may not be physically separate, and the elements shown as elements may or may not be physical elements, may be located in one place, or may be distributed over a plurality of network elements. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of this embodiment. Those of ordinary skill in the art will understand and implement the present invention without undue burden.
From the above description of the embodiments, it will be apparent to those skilled in the art that the embodiments may be implemented by means of software plus necessary general hardware platforms, or of course may be implemented by means of hardware. Based on this understanding, the foregoing technical solution may be embodied essentially or in a part contributing to the prior art in the form of a software product, which may be stored in a computer readable storage medium, such as ROM/RAM, a magnetic disk, an optical disk, etc., including several instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute the method described in the respective embodiments or some parts of the embodiments.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present application, and are not limiting thereof; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the corresponding technical solutions.

Claims (10)

1. A CSI-RS measurement method applied to an access network device, the method comprising:
determining a target location group corresponding to a resource indication (CSI-RS) of a target channel state information reference signal to be triggered;
a target terminal for determining a set of target locations, comprising: acquiring an uplink channel sounding reference signal SRS sent by a terminal; determining a first coverage area corresponding to the terminal according to the SRS; determining the first coverage area as a target terminal of a target coverage area; the target location group corresponds to a target coverage area, and the target terminal is located in the target coverage area;
and triggering the target terminal to measure the target CSI-RS.
2. The CSI-RS measurement method according to claim 1, wherein the determining, according to the SRS, a first coverage area corresponding to the terminal includes:
determining the direction angle of the terminal according to the SRS; the direction angle includes at least one of a horizontal direction arrival angle AOD and a vertical direction arrival angle ZOD;
according to a preset corresponding relation, determining a coverage area corresponding to the direction angle, wherein the coverage area is a first coverage area corresponding to the terminal; the corresponding relation comprises at least two coverage areas, and each coverage area corresponds to a continuous direction angle range.
3. The CSI-RS measurement method according to claim 1, wherein after the triggering the target terminal to measure the target CSI-RS, the method comprises:
receiving CSI measurement information reported by the target terminal;
determining a first precoding PMI matrix of the target terminal according to the CSI measurement information; determining a second PMI matrix corresponding to the target CSI-RS;
and determining the product of the first PMI matrix and the second PMI matrix as a downlink transmission matrix of the target terminal.
4. The CSI-RS measurement method according to claim 1, characterized in that the method further comprises:
and detecting an access terminal accessed to the coverage area of the access network equipment, and configuring aperiodic CSI-RS and a zero-power reference signal ZP corresponding to the aperiodic CSI-RS for the access terminal.
5. A CSI-RS measurement apparatus applied to an access network device, the apparatus comprising:
the location group determining module is used for determining a target location group corresponding to the resource indication CSI-RS of the target channel state information reference signal to be triggered;
the terminal determining module is used for determining a target terminal of the target location group; the target location group corresponds to a target coverage area, and the target terminal is located in the target coverage area;
the measurement triggering module is used for triggering the target terminal to measure the target CSI-RS;
the terminal determining module includes:
an acquisition sub-module, configured to acquire an uplink channel sounding reference signal SRS sent by a terminal;
a range determination submodule, configured to determine, according to the SRS, a first coverage area corresponding to the terminal;
and the terminal determination submodule is used for determining the first coverage area as a target terminal of the target coverage area.
6. The CSI-RS measurement apparatus according to claim 5, wherein the range determination submodule is configured to:
determining the direction angle of the terminal according to the SRS; the direction angle includes at least one of a horizontal direction arrival angle AOD and a vertical direction arrival angle ZOD;
according to a preset corresponding relation, determining a coverage area corresponding to the direction angle, wherein the coverage area is a first coverage area corresponding to the terminal; the corresponding relation comprises at least two coverage areas, and each coverage area corresponds to a continuous direction angle range.
7. The CSI-RS measurement apparatus according to claim 5, characterized in that the apparatus comprises:
the information receiving module is used for receiving the CSI measurement information reported by the target terminal;
a first matrix determining module, configured to determine a first precoding PMI matrix of the target terminal according to the CSI measurement information; determining a second PMI matrix corresponding to the target CSI-RS;
and the second matrix determining module is used for determining the product of the first PMI matrix and the second PMI matrix as a downlink transmission matrix of the target terminal.
8. The CSI-RS measurement apparatus according to claim 5, wherein the apparatus further comprises:
and the configuration module is used for detecting an access terminal accessed to the coverage area of the access network equipment and configuring aperiodic CSI-RS and zero-power reference signals ZP corresponding to the aperiodic CSI-RS for the access terminal.
9. An electronic device comprising a processor, a memory and a computer program stored on the memory and executable on the processor, characterized in that the computer program when executed by the processor implements the steps of the CSI-RS measurement method according to any of claims 1 to 4.
10. A computer readable storage medium, on which a computer program is stored, which computer program, when being executed by a processor, implements the steps of the CSI-RS measurement method according to any of claims 1 to 4.
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