CN118249862A - Channel state information reporting method and communication device - Google Patents
Channel state information reporting method and communication device Download PDFInfo
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- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
- H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
- H04B7/0615—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal
- H04B7/0619—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal using feedback from receiving side
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Abstract
The application provides a channel state information reporting method and a communication device. In the method, a terminal corrects or predicts a channel measurement result and then reports channel state information to a base station. When the channel state information indicates the corrected channel measurement result, accurate channel state information can be reported to the base station, and when the base station performs data transmission according to the channel state information, the phenomena of frequent fluctuation of MCS, low communication rate, poor user experience, frequent call drop, switching failure and the like can be reduced. When the channel state information indicates the predicted channel measurement result, the base station can normally schedule the MCS and accurately transmit the beam according to the latest predicted channel measurement result when the mobility channel is aged, thereby being beneficial to improving the network throughput rate and the terminal experience rate.
Description
Technical Field
The embodiment of the application relates to the technical field of wireless communication, in particular to a channel state information reporting method and a communication device.
Background
In a communication system, multiple input and output (multiple input multiple output, MIMO) technology plays a vital role in the spectral efficiency of the system. When the MIMO technology is adopted, when the network device sends data to the terminal, modulation coding and signal precoding are required, and how the network device performs modulation coding and signal precoding requires to rely on channel state information (CHANNEL STATE information) fed back by the terminal to the network device.
How the terminal reports the proper channel state information to the network equipment is to be solved.
Disclosure of Invention
The application provides a channel state information reporting method and a communication device, which are used for reporting proper channel state information to network equipment by a terminal.
In a first aspect, an embodiment of the present application provides a method for reporting channel state information, where the method may be performed by a terminal or a module (such as a chip) applied in the terminal. The method comprises the following steps: transmitting capability information to the network device, the capability information indicating that the terminal has the capability of correcting or predicting the channel measurement result by using the environment information; receiving first indication information from the network device, wherein the first indication information indicates that channel measurement results are corrected or predicted; channel state information is transmitted to the network device, the channel state information indicating a revised channel measurement or indicating a predicted channel measurement.
According to the scheme, the terminal corrects or predicts the channel measurement result and then reports the channel state information to the network equipment. When the channel state information indicates the corrected channel measurement result, relatively accurate channel state information can be reported to the network equipment, and when the network equipment performs data transmission according to the channel state information, the phenomena of frequent fluctuation of MCS, low communication rate, poor user experience, frequent call drop, switching failure and the like can be reduced. When the channel state information indicates the predicted channel measurement result, the network equipment can normally schedule the MCS and accurately transmit the wave beam according to the latest predicted channel measurement result when the mobility channel is aged, thereby being beneficial to improving the network throughput rate and the terminal experience rate.
In a possible implementation method, the capability information includes second indication information, where the second indication information indicates that the terminal owns the environment information, or indicates that the terminal does not have the environment information.
According to the scheme, the network equipment is informed through the second indication information: whether the terminal equipment has the environment information or not enables the network equipment to decide whether the environment information needs to be sent to the terminal or not, and is helpful for the terminal to quickly acquire the environment information.
In one possible implementation, the context information is received from the network device.
In a possible implementation method, the channel measurement result is corrected or predicted according to the environmental information, the position of the terminal and the information of the network device, so as to obtain the channel state information; wherein the information of the network device includes a location of the network device.
In a possible implementation method, the information of the network device further includes an antenna configuration of the network device.
In one possible implementation, information is received from the network device.
In a second aspect, an embodiment of the present application provides a method for reporting channel state information, where the method may be performed by a network device or a module (such as a chip) applied in the network device. The method comprises the following steps: receiving capability information from a terminal, the capability information indicating that the terminal has the capability of correcting or predicting a channel measurement result by using environment information; transmitting first indication information to the terminal, wherein the first indication information indicates that channel measurement results are corrected or predicted; channel state information is received from the terminal, the channel state information indicating a modified channel measurement or indicating a predicted channel measurement. The method is a method on the network device side corresponding to the first aspect, and therefore the advantageous effects of the first aspect can also be achieved.
In a possible implementation method, the capability information includes second indication information, where the second indication information indicates that the terminal owns the environment information, or indicates that the terminal does not have the environment information.
In one possible implementation, the context information is sent to the terminal.
In a possible implementation method, information of the network device is sent to the terminal, where the information of the network device is used to determine the channel state information, and the information of the network device includes a location of the network device.
In a possible implementation method, the information of the network device further includes an antenna configuration of the network device.
In a third aspect, an embodiment of the present application provides a communication device, where the device may be a terminal, or may be a module (such as a chip) applied to the terminal. The apparatus has the function of implementing any implementation method of the first aspect. The functions can be realized by hardware, and can also be realized by executing corresponding software by hardware. The hardware or software includes one or more modules corresponding to the functions described above.
In a fourth aspect, an embodiment of the present application provides a communication apparatus, where the apparatus may be a network device, and may also be a module (such as a chip or the like) applied to the network device. The apparatus has the function of implementing any implementation method of the second aspect. The functions can be realized by hardware, and can also be realized by executing corresponding software by hardware. The hardware or software includes one or more modules corresponding to the functions described above.
In a fifth aspect, an embodiment of the present application provides a communication apparatus, including a processor and a memory; the memory is configured to store computer instructions that, when executed by the apparatus, cause the apparatus to perform any of the implementation methods of the first to second aspects.
In a sixth aspect, embodiments of the present application provide a communications device comprising means for performing the steps of any of the implementing methods of the first to second aspects described above.
In a seventh aspect, an embodiment of the present application provides a communication device, including a processor and an interface circuit, where the processor is configured to communicate with other devices through the interface circuit, and perform any implementation method of the first aspect to the second aspect. The processor includes one or more.
In an eighth aspect, an embodiment of the present application provides a communication device, including a processor coupled to a memory, the processor configured to invoke a program stored in the memory, to perform any implementation method of the first aspect to the second aspect. The memory may be located within the device or may be located external to the device. And the processor may be one or more.
In a ninth aspect, embodiments of the present application further provide a computer readable storage medium having instructions stored therein that, when run on a communication device, cause any implementation method of the first to second aspects described above to be performed.
In a tenth aspect, embodiments of the present application also provide a computer program product comprising a computer program or instructions which, when executed by a communication device, cause any of the implementation methods of the first to second aspects described above to be performed.
In an eleventh aspect, an embodiment of the present application further provides a chip system, including: a processor configured to perform any implementation method of the first aspect to the second aspect.
Drawings
Fig. 1 is a schematic diagram of a communication system according to an embodiment of the present application;
Fig. 2 is a schematic diagram of a method for reporting channel state information according to an embodiment of the present application;
fig. 3 is a schematic diagram of a method for determining a corrected channel measurement result by a terminal according to an embodiment of the present application;
Fig. 4 is a schematic diagram of a method for reporting channel state information according to an embodiment of the present application;
fig. 5 is a schematic diagram of a method for determining a corrected channel measurement result by a base station according to an embodiment of the present application;
fig. 6 is a schematic diagram of a method for reporting channel state information according to an embodiment of the present application;
Fig. 7 is a schematic diagram of a method for determining information of a predicted channel by a terminal according to an embodiment of the present application;
fig. 8 is a schematic structural diagram of a communication device according to an embodiment of the present application;
Fig. 9 is a schematic structural diagram of a communication device according to an embodiment of the present application.
Detailed Description
Fig. 1 is a schematic architecture diagram of a communication system to which an embodiment of the present application is applied. As shown in fig. 1, the communication system 1000 comprises a radio access network 100 and a core network 200, and optionally the communication system 1000 may further comprise the internet 300. The radio access network 100 may include at least one radio access network device (e.g., 110a and 110b in fig. 1) and may also include at least one terminal (e.g., 120a-120j in fig. 1). The terminal is connected with the wireless access network equipment in a wireless mode, and the wireless access network equipment is connected with the core network in a wireless or wired mode. The core network device and the radio access network device may be separate physical devices, or may integrate the functions of the core network device and the logic functions of the radio access network device on the same physical device, or may integrate the functions of part of the core network device and part of the radio access network device on one physical device. The terminals and the radio access network device may be connected to each other by wired or wireless means. Fig. 1 is only a schematic diagram, and other network devices may be further included in the communication system, for example, a wireless relay device and a wireless backhaul device may also be included, which are not shown in fig. 1.
The radio access network device is an access device to which the terminal accesses the communication system by wireless. The radio access network device may be a base station (base station), an evolved NodeB (eNodeB), a transmission and reception point (transmission reception point, TRP), a next generation NodeB (gNB) in a fifth generation (5th generation,5G) mobile communication system, a next generation base station in a sixth generation (6th generation,6G) mobile communication system, a base station in a future mobile communication system, or an access node in a WiFi system, etc.; the present application may also be a module or unit that performs a function of a base station part, for example, a Central Unit (CU) or a Distributed Unit (DU). The CU here performs the functions of the radio resource control protocol and the packet data convergence layer protocol (PACKET DATA convergence protocol, PDCP) of the base station, and may also perform the functions of the service data adaptation protocol (SERVICE DATA adaptation protocol, SDAP); the DU performs the functions of the radio link control layer and the medium access control (medium access control, MAC) layer of the base station, and may also perform the functions of a part of the physical layer or the entire physical layer, and for a detailed description of the above protocol layers, reference may be made to the relevant technical specifications of the third generation partnership project (3rd generation partnership project,3GPP). The radio access network device may be a macro base station (e.g. 110a in fig. 1), a micro base station or an indoor station (e.g. 110b in fig. 1), a relay node or a donor node, etc. The embodiment of the application does not limit the specific technology and the specific equipment form adopted by the wireless access network equipment. For convenience of description, the network device is simply referred to as a radio access network device, and the base station is an example of the radio access network device.
A terminal is a device having a wireless transceiving function, and can transmit a signal to a base station or receive a signal from a base station. A terminal may also be referred to as a terminal device, user Equipment (UE), mobile station, mobile terminal, etc. The terminal may be widely applied to various scenes, for example, device-to-device (D2D), vehicle-to-device (vehicle to everything, V2X) communication, machine-type communication (MTC), internet of things (internet of things, IOT), virtual reality, augmented reality, industrial control, autopilot, telemedicine, smart grid, smart furniture, smart office, smart wear, smart transportation, smart city, and the like. The terminal can be a mobile phone, a tablet personal computer, a computer with a wireless receiving and transmitting function, a wearable device, a vehicle, an airplane, a ship, a robot, a mechanical arm, intelligent household equipment and the like. The embodiment of the application does not limit the specific technology and the specific equipment form adopted by the terminal.
The base station and the terminal may be fixed in position or movable. Base stations and terminals may be deployed on land, including indoors or outdoors, hand-held or vehicle-mounted; the device can be deployed on the water surface; but also on aircraft, balloons and satellites. The embodiment of the application does not limit the application scenes of the base station and the terminal.
The roles of base station and terminal may be relative, e.g., helicopter or drone 120i in fig. 1 may be configured as a mobile base station, terminal 120i being the base station for those terminals 120j that access radio access network 100 through 120 i; but for base station 110a 120i is a terminal, i.e., communication between 110a and 120i is via a wireless air interface protocol. Of course, communication between 110a and 120i may be performed via an interface protocol between base stations, and in this case, 120i is also a base station with respect to 110 a. Thus, both the base station and the terminal may be collectively referred to as a communication device, 110a and 110b in fig. 1 may be referred to as a communication device having base station functionality, and 120a-120j in fig. 1 may be referred to as a communication device having terminal functionality.
Communication can be carried out between the base station and the terminal, between the base station and between the terminal and the terminal through the authorized spectrum, communication can be carried out through the unlicensed spectrum, and communication can also be carried out through the authorized spectrum and the unlicensed spectrum at the same time; communication can be performed through a frequency spectrum of 6 gigahertz (GHz) or less, communication can be performed through a frequency spectrum of 6GHz or more, and communication can be performed using a frequency spectrum of 6GHz or less and a frequency spectrum of 6GHz or more simultaneously. The embodiment of the application does not limit the spectrum resources used by the wireless communication.
In the embodiment of the present application, the functions of the base station may be performed by a module (such as a chip) in the base station, or may be performed by a control subsystem including the functions of the base station. The control subsystem comprising the base station function can be a control center in the application scenarios of smart power grids, industrial control, intelligent transportation, smart cities and the like. The functions of the terminal may be performed by a module (e.g., a chip or a modem) in the terminal, or by a device including the functions of the terminal.
In the application, a base station sends a downlink signal or downlink information to a terminal, and the downlink information is borne on a downlink channel; the terminal sends an uplink signal or uplink information to the base station, and the uplink information is carried on an uplink channel. In order for a terminal to communicate with a base station, it is necessary to establish a radio connection with a cell controlled by the base station. The cell with which the terminal has established a radio connection is called the serving cell of the terminal. The terminal may also be interfered by signals from neighboring cells when communicating with the serving cell.
At present, the process of measuring and reporting the channel by the terminal is as follows: the base station sends configuration information to the terminal, then the base station sends pilot frequency to the terminal, the terminal measures the pilot frequency sent by the base station according to the configuration information to obtain a channel measurement result, and then sends CSI to the base station, wherein the CSI indicates the channel measurement result.
The CSI reported by the terminal includes, but is not limited to, one or more of the following information:
1) Rank Indication (RI).
The base station determines the number of streams of data transmitted to the terminal according to the RI.
2) Channel quality indication (channel quality indicator, CQI).
The CQI is used to indicate channel quality.
The base station determines a modulation and coding scheme (modulation and coding scheme, MCS) for transmitting data to the terminal according to the CQI.
3) Precoding matrix indicator (precoding matrix indication, PMI).
The PMI is an index of a precoding matrix recommended by the terminal.
And the base station determines precoding for transmitting data to the terminal according to the PMI. Wherein the PMI indicates the codebook base and codebook coefficients. The codebook substrate may be a domain matrix, such as a spatial domain matrix, a frequency domain matrix, or a space-frequency domain matrix.
4) Channel state information reference signal (CHANNEL STATE information-REFERENCE SIGNAL, CSI-RS) resource index (CSI-RS resource indicator, CRI).
CRI is an index of recommended CSI-RS resources, which corresponds to the recommended beam.
5) Layer Indicator (LI)
LI indicates a column of the precoding matrix corresponding to the reported PMI, and the column corresponds to the strongest layer of the codeword with larger wideband CQI.
6) Synchronization signal block resource indication (SS/PBCH block resource indicator, SSBRI)
SSBRI is the resource index corresponding to SSB.
Currently, when a terminal performs channel measurement, the channel measurement may be inaccurate due to the following factors: first, the interference from the propagation environment, such as multipath propagation, large co-channel interference, low signal to interference plus noise ratio (signal to interference plus noise ratio, SINR), etc.; secondly, the terminal capability is low; thirdly, the channel measurement resources are limited, the bandwidth of a configured bandwidth part (BWP) is smaller, and the time-frequency resources are insufficient; fourth, the mobility channel ages, and the channel reported by measurement is an outdated channel; fifth, abnormal point positions, such as RANK (RANK) critical points, are measured, and network entry is initiated. After one or more of the above causes the channel measurement to be inaccurate, the following problems may be caused: firstly, reported CQI is unreliable, so that MCS scheduling is abnormal; secondly, reporting RI/CQI jump, which causes the MCS fluctuation to be large, thus comparing the performance of relying on error code to adjust loss; thirdly, inaccurate PMI is reported, so that the CSI beam forming is inaccurate, and the downlink throughput rate is reduced; fourth, the parameter value reported by measurement is virtually high, resulting in continuous handover failure/call drop, etc. Therefore, how to report accurate CSI is to be solved.
Furthermore, how to predict future channel measurements based on current channel measurements so that the base station can schedule data transmissions according to the predicted channel measurements is also required in many applications, which is also to be solved.
The channel state information reporting method provided by the embodiment of the application can be executed by the terminal or a module applied to the terminal, and the base station or a module applied to the base station. For convenience of explanation, in the following description, the method is exemplified by the terminal and the base station.
Fig. 2 is a schematic diagram of a method for reporting channel state information according to an embodiment of the present application. In this embodiment, after obtaining the channel measurement result from the channel measurement, the terminal may correct the channel measurement result and generate CSI according to the corrected channel measurement result.
The method comprises the following steps:
In step 201, the terminal sends capability information to the base station. Accordingly, the base station receives the capability information.
The capability information indicates that the terminal has the capability of correcting the channel measurement result using the environment information. Or it is understood that the capability information indicates that the terminal has the capability of performing auxiliary communication using the environment information, and the capability of the auxiliary communication includes at least the capability of correcting the channel measurement result.
The "environment information" may also be referred to as an environment map, an electronic map, a digital map, or the like. The environment information is used to indicate the surrounding environment of the terminal. The environmental information includes, for example, vertex coordinates of environmental scatterers such as buildings, rivers, etc., and the data amount of the environmental information may be, for example, megabit (MB) or Kilobit (KB) levels, etc.
In an implementation method, a terminal actively transmits the capability information to a base station.
In yet another implementation method, before step 201, the base station sends a query message to the terminal, where the query message is used to query the capability information of the terminal, and the terminal performs step 201 above in response to the query message.
Step 202, the base station sends first indication information to the terminal. Accordingly, the terminal receives the first indication information.
After receiving the capability information, the base station knows that the terminal has the capability of correcting the channel measurement result by using the environment information, and can send the first indication information to the terminal, wherein the first indication information indicates to correct the channel measurement result. The first indication information may also be referred to as measurement correction mode indication information, measurement correction indication information, or the like.
In the implementation method, before sending the first indication information, the base station also needs to determine that the first condition is met, that is, the base station sends the first indication information to the terminal if the base station determines that the first condition is met. The first condition includes one or more of:
1) And the CQI value reported by the terminal is lower than a first threshold value.
The CQI herein refers to a historical CQI reported by the terminal.
2) The RSRQ value reported by the terminal is lower than a second threshold value;
the RSRQ value herein refers to a historical RSRQ value reported by the terminal.
3) The number of negative acknowledgement messages (NACKs) received by the base station for a period of time is greater than a third threshold.
The NACK refers to response information fed back by the terminal after the base station transmits downlink data to the terminal, where the NACK is used to indicate that the downlink data transmitted by the base station is not correctly received.
4) The amount of resources used for channel measurement is below the fourth threshold.
The specific values of the first threshold, the second threshold, the third threshold and the fourth threshold are not limited in the application.
In step 203, the terminal sends CSI to the base station. Accordingly, the base station receives the CSI.
And after the terminal receives the first indication information, triggering the terminal to correct the channel measurement result to obtain a corrected channel measurement result, wherein the corrected channel measurement result is indicated by the CSI.
In the scheme, the terminal can correct the channel measurement result and report the CSI to the base station, the CSI indicates the corrected channel measurement result, the accurate CSI can be reported to the base station, and the base station can reduce the phenomena of frequent fluctuation of MCS, low communication rate, poor user experience, frequent call drop, switching failure and the like when transmitting data according to the CSI.
The application is not limited to the specific implementation of the terminal to correct the channel measurement result. As an example, the terminal may correct the channel measurement result according to the environment information, the location of the terminal, and the information of the base station, to obtain CSI.
The environment information may be stored locally in the terminal in advance, and may be referred to as offline environment information, an offline map, or the like. Or the environment information may be sent by the base station to the terminal, for example, in step 201, the capability information sent by the terminal to the base station further includes second indication information, where the second indication information indicates that the terminal has the environment information, or indicates that the terminal has no environment information. If the second indication information indicates that the terminal has the environmental information, the base station may not send the environmental information to the terminal, or may send the environmental information to the terminal so that the terminal updates the locally stored environmental information according to the received environmental information. If the second indication information indicates that the terminal does not have the environment information, the base station transmits the environment information to the terminal.
The position of the terminal can be measured by the terminal. The terminal obtains the self-location using, for example, a global positioning system (global positioning system, GPS) or real-time kinematic (REALTIME KINEMATIC, RTK) technique. For another example, the terminal obtains its own motion trail by using a sensor, and then determines its own position according to the motion trail.
The information of the base station comprises the position of the base station, and optionally, the information of the base station also comprises the antenna form of the base station. For example, when the antenna is an area array antenna, the antenna configuration includes information such as the number of antenna rows, the number of antenna columns, the row spacing, and the column spacing. For example, when the antenna is a circular area array, the antenna form includes information such as radius, number of array elements, etc. The information of the base station is transmitted by the base station to the terminal. For example, simultaneously, before or after step 202 described above, the base station transmits information of the base station to the terminal.
Illustratively, a specific implementation of correcting the channel measurement result by the terminal according to the environmental information, the location of the terminal and the information of the base station to obtain CSI is given below, and referring to fig. 3, the method includes the following steps:
In step 301, the terminal measures and obtains information of a statistical measurement channel in a period of time.
The information of the statistical measurement channel may be inaccurate due to noise pollution, insufficient measurement resources, insufficient terminal capability, and the like, and the information of the statistical measurement channel needs to be corrected subsequently, and the corrected information of the statistical measurement channel is indicated through CSI.
The following usesRepresenting a channel matrix of statistically measured channels.
And 302, the terminal obtains the information of the deterministic statistical channel according to the environment information, the position of the terminal and the information of the base station.
The information of the deterministic statistical channel is used for correcting the information of the statistical measurement channel to obtain a corrected channel measurement result, and the corrected channel measurement result is indicated through the CSI.
The location of the terminal may be an absolute location (such as latitude and longitude information) of the terminal, or a virtual location, or a location fingerprint. Correspondence between the virtual position and the real position of the terminal. The location fingerprint may be used to determine the true location of the terminal. The location fingerprint refers to information capable of characterizing the actual location of the terminal, for example, the location fingerprint may be Reference Signal Received Powers (RSRP) of a plurality of cells or base stations measured by the terminal, and the terminal may calculate the actual location of the terminal according to the plurality of RSRP.
In the implementation method, a terminal obtains information of a first deterministic channel according to environment information, the position of the terminal and information of a base station, obtains information of a plurality of second deterministic channels according to the environment information, a plurality of positions around the terminal and the information of the base station, and obtains information of a deterministic statistical channel according to the information of the first deterministic channel and the information of the plurality of second deterministic channels. Specifically, the terminal performs weighted average on the information of the first deterministic channel and the information of the plurality of second deterministic channels to obtain the information of the deterministic statistical channel.
The channel matrix of deterministic statistical channels is denoted below by H d.
In step 303, the terminal determines the covariance of the statistical measurement channel and the covariance of the deterministic statistical channel.
Wherein,
Representing the covariance of the statistically measured channel, E representing the desired function, t representing time,Is a feature vector,Is a eigenvalue matrix,RepresentationIs a complex matrix of the matrix.
Wherein,
R d represents the covariance of the deterministic statistical channel, E represents the desired function, t represents time, U d is the eigenvector, D d is the eigenvalue matrix,Representing the conjugate transpose of U d.
And step 304, the terminal determines a codebook substrate and codebook coefficients according to the covariance of the statistical measurement channel and the covariance of the deterministic statistical channel.
Specifically, the step 304 includes the following steps a) to d).
A) For a pair ofFeature vectorPerforming discrete Fourier transform (discrete fourier transform, DFT) projection to obtain a vector set S n;
b) Performing DFT projection on the feature vector U d of R d to obtain a vector set S d;
c) Calculate intersection S c of S d and S n and determine the codebook base of S c
D) Will beAtUpward projection to obtain codebook coefficient
In step 305, the terminal determines a filter matrix according to the codebook substrate and the codebook coefficients.
Wherein,
The function represents pairsThe solution when the minimum value is found is the filter matrix W.
When solving this function using the linear minimum mean square root error (linearminimum mean square error, LMMSE) method, the solution of this function is: Wherein/> Is the codebook base,Is a codebook coefficient,IsIs a complex matrix of the matrix.
Step 306, the terminal corrects the channel matrix of the statistical measurement channel according to the filter matrix to obtain a corrected channel measurement result, that is, a corrected channel matrix of the statistical measurement channel, and then indicates the corrected channel measurement result with CSI.
In particular, the method comprises the steps of,
Where H is the channel matrix of the modified statistically measured channel.
Fig. 4 is a schematic diagram of a method for reporting channel state information according to an embodiment of the present application. In this embodiment, after reporting CSI, the base station corrects the channel measurement result indicated by the CSI to obtain a corrected channel measurement result.
The method comprises the following steps:
In step 401, the terminal sends the location of the terminal to the base station. Accordingly, the base station receives the location of the terminal.
The implementation method for the terminal to acquire the self-location may refer to the related description in the foregoing embodiment of fig. 2, which is not repeated herein.
The location of the terminal sent by the terminal to the base station may be an absolute location (such as latitude and longitude information) of the terminal, or a virtual location, or a location fingerprint.
When the base station receives the virtual position of the terminal, the base station can determine the real position of the terminal according to the corresponding relation between the virtual position and the real position.
When the base station receives the position fingerprint, the base station can calculate the real position of the terminal according to the position fingerprint. The location fingerprint refers to information capable of characterizing the actual location of the terminal, for example, the location fingerprint may be RSRP of a plurality of cells or base stations measured by the terminal, and the base station calculates the actual location of the terminal based on the plurality of RSRP.
This step 401 is an optional step.
In step 402, the terminal sends CSI to the base station. Accordingly, the base station receives the CSI.
The CSI is CSI obtained by the terminal after measuring the channel, the CSI may not be accurate enough, and the terminal does not correct the channel measurement result indicated by the CSI.
In step 403, the base station determines a corrected CSI according to the location of the terminal, the information of the base station and the CSI, where the corrected CSI indicates a corrected channel measurement result.
The information of the base station comprises the position of the base station, and optionally, the information of the base station also comprises the antenna form of the base station. An explanation about the antenna morphology can be referred to the relevant description of the embodiment of fig. 2.
In one implementation method, if the above step 401 is not performed, that is, the terminal does not report its own location to the base station, the base station may acquire the location of the terminal through other methods. For example, the base station completes positioning the terminal according to the measurement information reported by the terminal, thereby obtaining the position of the terminal. For another example, the base station forwards the measurement information reported by the terminal to the positioning center, the positioning center completes positioning of the terminal and obtains the position of the terminal, and then the positioning center sends the position of the terminal to the base station. The present application is not limited to the method in which the base station acquires the location of the terminal.
In the above scheme, the channel measurement result can be corrected to obtain the corrected CSI, where the corrected CSI indicates the corrected channel measurement result, and when the base station performs data transmission according to the corrected CSI, the occurrence of phenomena such as frequent MCS fluctuation, low communication rate, poor user experience, frequent call drop, handover failure, and the like can be reduced.
Illustratively, one specific implementation in which the base station determines the corrected CSI based on the location of the terminal, the information of the base station, and the CSI is given below, with reference to fig. 5, the method includes the steps of:
In step 501, the base station determines the covariance (denoted by R s) of the statistically measured channel based on the codebook base and codebook coefficients in the CSI.
Wherein,
Representing codebook base,Representing codebook coefficients,RepresentationIs a complex matrix of the matrix.
Step 502, the base station obtains information of a deterministic statistical channel according to the environment information, the position of the terminal and the information of the base station, and determines covariance (represented by R d) of the deterministic statistical channel.
Specific implementations of this step 502 may be found in the descriptions of steps 302 and 303 previously described.
In step 503, the base station determines a codebook basis (for use) based on the covariance of the statistically measured channels and the covariance of the deterministic statistical channelsRepresentation) and codebook coefficients (inRepresentation).
Specific implementations of this step 503 may be found in the description of step 304 above.
In step 504, the base station determines a filter matrix (denoted by W) based on the codebook base and the codebook coefficients.
Specific implementations of this step 504 may be referred to the description of step 305 previously described.
In step 505, the base station measures the channel matrix of the channel (usingRepresentation) to obtain a corrected channel measurement, i.e. a channel matrix (denoted H) of the corrected statistically measured channel, and indicating the corrected channel measurement with the corrected CSI.
In particular, the method comprises the steps of,
Fig. 6 is a schematic diagram of a method for reporting channel state information according to an embodiment of the present application. In this embodiment, after obtaining the channel measurement result from the channel measurement, the terminal may predict the channel measurement result and generate CSI according to the predicted channel measurement result.
The method comprises the following steps:
in step 601, the terminal transmits capability information to the base station. Accordingly, the base station receives the capability information.
The capability information indicates that the terminal has the capability of predicting the channel measurement result using the environment information. Or it is understood that the capability information indicates that the terminal has the capability of performing auxiliary communication using the environment information, and the capability of the auxiliary communication includes at least the capability of predicting the channel measurement result.
For the definition of "environment information", reference may be made to the description of the embodiment of fig. 2, and no further description is given.
In step 602, the base station sends first indication information to the terminal. Accordingly, the terminal receives the first indication information.
After receiving the capability information, the base station knows that the terminal has the capability of predicting the channel measurement result by using the environment information, and can send the first indication information to the terminal, wherein the first indication information indicates to predict the channel measurement result. The first indication information may also be referred to as measurement prediction mode indication information, measurement prediction indication information, or the like.
In the implementation method, when a base station determines that Doppler frequency offset is larger than a frequency offset threshold value, first indication information is sent to a terminal.
In step 603, the terminal sends CSI to the base station. Accordingly, the base station receives the CSI.
And after receiving the first indication information, the terminal triggers the terminal to predict the channel measurement result to obtain a predicted channel measurement result, and the corrected channel measurement result is indicated by the CSI.
In the scheme, the terminal can predict the channel measurement result and report the CSI to the base station, wherein the CSI indicates the predicted channel measurement result, so that the base station can normally schedule the MCS and accurately transmit the wave beam according to the latest predicted channel measurement result when the mobility channel is aged, and the network throughput rate and the terminal experience rate can be improved.
The application is not limited to a specific implementation manner in which the terminal predicts the channel measurement result. As an example, the terminal may predict the channel measurement result according to the environment information, the location of the terminal, and the information of the base station, to obtain CSI.
The manner in which the terminal obtains the environment information and the location of the terminal may be described with reference to the embodiment of fig. 2.
The information of the base station includes a location of the base station, and optionally, the information of the base station further includes one or more of an antenna configuration of the base station, a predicted time T, or indication information for indicating whether to report a plurality of predicted times. Reference may be made to the description of the embodiment of fig. 2 for the meaning of the antenna morphology.
By way of example, a specific implementation in which a terminal predicts channel measurement results to obtain CSI according to environmental information, a location of the terminal, and information of a base station is given below, and referring to fig. 7, the method includes the steps of:
In step 701, the terminal determines information of the statistical measurement channels corresponding to the N times respectively and information of the deterministic statistical channels corresponding to the N times respectively, where N is a positive integer.
Wherein the information of each of the N statistically measured channels may be expressed as a function of time t, i.e., H ti,r (f, t). The information for each of the N deterministic statistical channels may be expressed as a function of time t, i.e., H ti,d (f, t).
The method for determining the information of the deterministic statistical channel corresponding to each time may refer to the description of the embodiment of fig. 2, that is, the information of the deterministic statistical channel corresponding to each time is determined according to the location of the terminal, the information of the base station and the environmental information.
In step 702, the terminal determines a filter matrix (denoted by W) according to the information of the statistical measurement channels corresponding to the N times and the information of the deterministic statistical channels corresponding to the N times.
The filter matrix W is a mapping relation matrix from deterministic statistical channels to statistical measurement channels.
In particular, the method comprises the steps of,
The function represents pairsThe solution when the minimum value is found is the filter matrix W.
In step 703, the terminal determines information of a predicted channel corresponding to the predicted time according to the filtering matrix and the information of the deterministic statistical channel corresponding to the predicted time (denoted by T), and indicates the information of the predicted channel with CSI.
The predicted time refers to a time in the future.
Wherein,
Information indicating a prediction channel corresponding to the prediction time T, H T,d (f, T) information indicating a deterministic statistical channel corresponding to the prediction time T, and W information indicating a filter matrix. /(I)
It will be appreciated that, in order to implement the functions in the above embodiments, the base station and the terminal include corresponding hardware structures and/or software modules for performing the respective functions. Those of skill in the art will readily appreciate that the various illustrative elements and method steps described in connection with the embodiments disclosed herein may be implemented as hardware or combinations of hardware and computer software. Whether a function is implemented as hardware or computer software driven hardware depends upon the particular application scenario and design constraints imposed on the solution.
Fig. 8 and 9 are schematic structural diagrams of a possible communication device according to an embodiment of the present application. These communication devices may be used to implement the functions of the terminal or the base station in the above method embodiments, so that the beneficial effects of the above method embodiments may also be implemented. In the embodiment of the present application, the communication device may be one of the terminals 120a to 120j shown in fig. 1, or may be the base station 110a or 110b shown in fig. 1, or may be a module (e.g., a chip) applied to the terminal or the base station.
The communication device 800 shown in fig. 8 includes a processing unit 810 and a transceiving unit 820. The communication device 800 is used to implement the functions of the terminal or base station in the method embodiments shown in fig. 2 to 7 described above.
When the communication device 800 is used to implement the functions of the terminal in the method embodiments shown in fig. 2 to 4 and fig. 6 to 7: the processing unit 810 is configured to control the transceiver unit 820 to send capability information to a network device, where the capability information indicates that the terminal has a capability of correcting or predicting a channel measurement result by using environmental information; receiving first indication information from the network equipment, wherein the first indication information indicates that channel measurement results are corrected or predicted; channel state information is sent to the network device, the channel state information indicating a revised channel measurement or indicating a predicted channel measurement.
In a possible implementation method, the processing unit 810 is further configured to control the transceiver unit 820 to receive the environmental information from the network device.
In a possible implementation method, the processing unit 810 is further configured to correct or predict the channel measurement result according to the environmental information, the location of the terminal, and the information of the network device, to obtain the channel state information; wherein the information of the network device includes a location of the network device.
In a possible implementation method, the processing unit 810 is further configured to control the transceiver unit 820 to receive information of the network device from the network device.
When the communication device 800 is used to implement the functions of the base station in the method embodiments shown in fig. 2, fig. 4 to fig. 6: the processing unit 810 is configured to control the transceiver unit 820: receiving capability information from a terminal, wherein the capability information indicates that the terminal has the capability of correcting or predicting a channel measurement result by utilizing environment information; transmitting first indication information to the terminal, wherein the first indication information indicates that channel measurement results are corrected or predicted; channel state information is received from the terminal, the channel state information indicating a corrected channel measurement or indicating a predicted channel measurement.
In a possible implementation method, the processing unit 810 is further configured to control the transceiver unit 820 to send the environmental information to the terminal.
In a possible implementation method, the processing unit 810 is further configured to control the transceiver unit 820 to send information of a network device to the terminal, where the information of the network device is used to determine the channel state information, and the information of the network device includes a location of the network device.
A more detailed description of the processing unit 810 and the transceiver unit 820 described above may be referred to in connection with the method embodiments shown in fig. 2 to 7.
The communication device 900 shown in fig. 9 includes a processor 910 and an interface circuit 920. The processor 910 and the interface circuit 920 are coupled to each other. It is understood that the interface circuit 920 may be a transceiver or an input-output interface. Optionally, the communication device 900 may further include a memory 930 for storing instructions executed by the processor 910 or for storing input data required by the processor 910 to execute the instructions or for storing data generated after the processor 910 executes the instructions.
When the communication device 900 is used to implement the methods shown in fig. 2 to 7, the processor 910 is used to implement the functions of the processing unit 810, and the interface circuit 920 is used to implement the functions of the transceiver unit 820.
When the communication device is a chip applied to the terminal, the terminal chip realizes the functions of the terminal in the embodiment of the method. The terminal chip receives information from other modules (such as a radio frequency module or an antenna) in the terminal, and the information is sent to the terminal by the base station; or the terminal chip sends information to other modules in the terminal (such as a radio frequency module or an antenna), which the terminal sends to the base station.
When the communication device is a module applied to a base station, the base station module realizes the functions of the base station in the method embodiment. The base station module receives information from other modules (such as radio frequency modules or antennas) in the base station, the information being transmitted by the terminal to the base station; or the base station module transmits information to other modules in the base station, such as a radio frequency module or an antenna, which the base station transmits to the terminal. The base station module may be a baseband chip of a base station, or may be a CU, DU or other module, or may be a device under an open radio access network (open radio access network, O-RAN) architecture, for example, an open CU, an open DU, or other devices.
It is to be appreciated that the Processor in embodiments of the application may be a central processing unit (Central Processing Unit, CPU), but may also be other general purpose processors, digital signal processors (DIGITAL SIGNAL processors, DSPs), application Specific Integrated Circuits (ASICs), field programmable gate arrays (Field Programmable GATE ARRAY, FPGA) or other programmable logic devices, transistor logic devices, hardware components, or any combination thereof. The general purpose processor may be a microprocessor, but in the alternative, it may be any conventional processor.
The method steps of the embodiments of the present application may be implemented in hardware or in software instructions executable by a processor. The software instructions may be comprised of corresponding software modules that may be stored in random access memory, flash memory, read only memory, programmable read only memory, erasable programmable read only memory, electrically erasable programmable read only memory, registers, hard disk, removable disk, CD-ROM, or any other form of storage medium known in the art. An exemplary storage medium is coupled to the processor such the processor can read information from, and write information to, the storage medium. The storage medium may be integral to the processor. The processor and the storage medium may reside in an ASIC. In addition, the ASIC may reside in a base station or terminal. The processor and the storage medium may reside as discrete components in a base station or terminal.
In the above embodiments, it may be implemented in whole or in part by software, hardware, firmware, or any combination thereof. When implemented in software, may be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer programs or instructions. When the computer program or instructions are loaded and executed on a computer, the processes or functions described in the embodiments of the present application are performed in whole or in part. The computer may be a general purpose computer, a special purpose computer, a computer network, a network device, a user device, or other programmable apparatus. The computer program or instructions may be stored in a computer readable storage medium or transmitted from one computer readable storage medium to another computer readable storage medium, for example, the computer program or instructions may be transmitted from one website site, computer, server, or data center to another website site, computer, server, or data center by wired or wireless means. The computer readable storage medium may be any available medium that can be accessed by a computer or a data storage device such as a server, data center, etc. that integrates one or more available media. The usable medium may be a magnetic medium, e.g., floppy disk, hard disk, tape; but also optical media such as digital video discs; but also semiconductor media such as solid state disks. The computer readable storage medium may be volatile or nonvolatile storage medium, or may include both volatile and nonvolatile types of storage medium.
In various embodiments of the application, where no special description or logic conflict exists, terms and/or descriptions between the various embodiments are consistent and may reference each other, and features of the various embodiments may be combined to form new embodiments based on their inherent logic.
In the present application, "at least one" means one or more, and "a plurality" means two or more. "and/or", describes an association relationship of an association object, and indicates that there may be three relationships, for example, a and/or B, and may indicate: a alone, a and B together, and B alone, wherein a, B may be singular or plural. In the text description of the present application, the character "/", generally indicates that the associated objects are an or relationship; in the formula of the present application, the character "/" indicates that the front and rear associated objects are a "division" relationship. "including at least one of A, B and C" may mean: comprises A; comprises B; comprising C; comprises A and B; comprises A and C; comprises B and C; including A, B and C.
It will be appreciated that the various numerical numbers referred to in the embodiments of the present application are merely for ease of description and are not intended to limit the scope of the embodiments of the present application. The sequence number of each process does not mean the sequence of the execution sequence, and the execution sequence of each process should be determined according to the function and the internal logic.
Claims (14)
1. The channel state information reporting method is executed by a terminal or a module applied in the terminal and is characterized by comprising the following steps:
transmitting capability information to a network device, wherein the capability information indicates that the terminal has the capability of correcting or predicting a channel measurement result by using environment information;
Receiving first indication information from the network equipment, wherein the first indication information indicates that channel measurement results are corrected or predicted;
Channel state information is sent to the network device, the channel state information indicating a revised channel measurement or indicating a predicted channel measurement.
2. The method of claim 1, wherein the capability information includes second indication information, the second indication information indicating that the terminal owns the environment information or indicating that the terminal does not have the environment information.
3. The method of claim 1 or 2, wherein the method further comprises:
the environmental information is received from the network device.
4. A method according to any one of claims 1 to 3, wherein the method further comprises:
Correcting or predicting the channel measurement result according to the environment information, the position of the terminal and the information of the network equipment to obtain the channel state information;
wherein the information of the network device includes a location of the network device.
5. The method of claim 4, wherein the information of the network device further comprises an antenna morphology of the network device.
6. The method of claim 4 or 5, wherein the method further comprises:
Information from the network device is received.
7. A channel state information reporting method, performed by a network device or a module applied in the network device, comprising:
receiving capability information from a terminal, wherein the capability information indicates that the terminal has the capability of correcting or predicting a channel measurement result by utilizing environment information;
Transmitting first indication information to the terminal, wherein the first indication information indicates that channel measurement results are corrected or predicted;
channel state information is received from the terminal, the channel state information indicating a corrected channel measurement or indicating a predicted channel measurement.
8. The method of claim 7, wherein the capability information includes second indication information indicating that the terminal has the environment information or that the terminal does not have the environment information.
9. The method of claim 7 or 8, wherein the method further comprises:
And sending the environment information to the terminal.
10. The method of any one of claims 7 to 9, wherein the method further comprises:
and sending information of the network equipment to the terminal, wherein the information of the network equipment is used for determining the channel state information, and the information of the network equipment comprises the position of the network equipment.
11. The method of claim 10, wherein the information of the network device further comprises an antenna morphology of the network device.
12. A communication device comprising a processor and interface circuitry for receiving signals from other communication devices and transmitting to the processor or sending signals from the processor to other communication devices, the processor being configured to implement the method of any one of claims 1 to 6 or to implement the method of any one of claims 7 to 11 by logic circuitry or execution of code instructions.
13. A communication device comprising means for performing the method of any one of claims 1 to 6 or means for performing the method of any one of claims 7 to 11.
14. A computer readable storage medium, characterized in that the storage medium has stored therein a computer program or instructions which, when executed by a communication device, implement the method of any of claims 1 to 6 or the method of any of claims 7 to 11.
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| CN202211667592.3A CN118249862A (en) | 2022-12-23 | 2022-12-23 | Channel state information reporting method and communication device |
| PCT/CN2023/138892 WO2024131642A1 (en) | 2022-12-23 | 2023-12-14 | Channel state information reporting method and communication device |
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| EP2497311B1 (en) * | 2009-11-04 | 2018-12-26 | Nokia Solutions and Networks Oy | Resolving channel state information outdating |
| CN105991231B (en) * | 2015-02-28 | 2021-07-30 | 中兴通讯股份有限公司 | Method and device for acquiring Channel State Information (CSI) |
| CN109257126B (en) * | 2018-08-30 | 2021-03-09 | 北京大学（天津滨海）新一代信息技术研究院 | Indoor activity detection method and system based on wireless signals |
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| CN115022896A (en) * | 2021-03-05 | 2022-09-06 | 维沃移动通信有限公司 | Information reporting method and device, first equipment and second equipment |
| US20220338189A1 (en) * | 2021-04-16 | 2022-10-20 | Samsung Electronics Co., Ltd. | Method and apparatus for support of machine learning or artificial intelligence techniques for csi feedback in fdd mimo systems |
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