Communication method and communication apparatus

Abstract

A communication method and a communication apparatus. On the basis of the present application, a first apparatus can determine multipath components (MPCs) at the location of the first apparatus; a first pilot pattern is determined on the basis of the MPCs, wherein the first pilot pattern is used for indicating a first time-frequency point, and the first time-frequency point is used for sending a pilot signal; or feedback dimensions are determined on the basis of the MPCs, wherein the feedback dimensions comprise time-domain feedback dimensions and frequency-domain feedback dimensions, the time-domain feedback dimensions and the frequency-domain feedback dimensions are used for determining a second time-frequency point, and the second time-frequency point is used for feeding back channel information. The present application can achieve lower overheads of channel estimation, reduce the complexity of channel estimation and reduce feedback overhead.

Description

A communication method and a communication device

[0001] The present application claims priority to the Chinese patent application No. 202411074847.4, filed on August 6, 2024, entitled "A communication method and a communication device", the entire contents of which are incorporated herein by reference. TECHNICAL FIELD

[0002] The present application relates to the field of communication, and more particularly, to a communication method and a communication device. BACKGROUND

[0003] Multiple-input multiple-output (MIMO) technology has spatial multiplexing gain, diversity gain and beamforming capability. By configuring multiple antennas at the transmitting end and the receiving end, multiple reception and multiple transmission are realized, and spatial resources are fully utilized. The capacity and spectral efficiency of the communication system can be doubled without increasing the spectral resources and the transmitting power, which has significant performance advantages.

[0004] In the MIMO technology, channel estimation is needed for transmitting and receiving data, obtaining system synchronization and feeding back channel information. Channel estimation refers to measuring the channel by using the reference signals known by the transmitting end and the receiving end, and tracking the time domain and / or frequency domain changes of the channel. The existing channel estimation method uses a projection operator to decompose the channel or the channel matrix, and the overhead of channel estimation is large. Therefore, there is an urgent need for a communication method to reduce the overhead of channel estimation. SUMMARY

[0005] The present application provides a communication method and a communication device to achieve a smaller overhead of channel feedback and estimation.

[0006] In a first aspect, a communication method is provided, which is applied to a first device. The method can be performed by the first device, which can be a device (for example, a terminal device or a network device) at a terminal device side or a network device side, or a component (for example, a communication module, a processor, a circuit, a chip, or a chip system) in the device, or a logic module or software capable of implementing all or part of the functions of the communication device. The terminal device side can include at least one of a terminal device or an AI entity at the terminal device side. The AI entity at the terminal device side can be the terminal device itself or an AI entity serving the terminal device, for example, a server such as an over the top (OTT) server or a cloud server. The network device side can include at least one of a network device or an AI entity at the network device side. The AI entity at the network device side can be the network device itself or an AI entity serving the network device, for example, a radio access network (RAN) intelligent controller (RIC), an operation administration and maintenance (OAM), or a server such as an OTT server or a cloud server. The communication between the servers can be realized through a communication link between the terminal device and the network device, or through other communication devices outside the servers, or through a wired link. For ease of description, the method performed by the first device is described below.

[0007] The method includes determining a multipath component (MPC) of a location where the first device is located, and determining a first pilot pattern according to the MPC, the first pilot pattern being used to indicate a first time-frequency point, and the first time-frequency point being used to send a reference signal.

[0008] Specifically, after the first device determines the multipath component (MPC) of the location where the first device is located, the first device can determine the first pilot pattern according to the MPC.

[0009] Based on the scheme provided in the embodiments of the present application, the first pilot pattern used to send the reference signal is determined based on the MPC, and channel estimation can be realized through the sending of the reference signal. On the one hand, channel measurement can be realized without the need to decompose the channel or the channel matrix, and the complexity of channel estimation can be reduced. On the other hand, the information of the MPC is fully utilized, and channel estimation through the MPC can be realized, and the complexity of channel estimation and feedback can be reduced.

[0010] In some possible implementation manners, the method further includes sending fourth indication information, the fourth indication information being used to indicate the first pilot pattern.

[0011] Specifically, after determining the first pilot pattern, the first device can send fourth indication information to the second device, and the fourth indication information can be used by the second device to determine the first pilot pattern.

[0012] Based on the scheme provided in the embodiments of the present application, the first device and the second device can synchronize the first pilot pattern for transmitting the reference signal through the fourth indication information, the correct pilot pattern can be determined, the first time-frequency point for transmitting the reference signal can be determined through the first pilot pattern, the correct measurement of the reference signal by the receiving end (the end receiving the reference signal) can be realized, the corresponding channel state information can be obtained through the response of the reference signal, and channel estimation can be realized.

[0013] In some possible implementation manners, the first pilot pattern is also used to indicate a first transmit antenna port, and the first transmit antenna port is used to transmit the reference signal.

[0014] Specifically, the first transmit antenna port indicated by the first pilot pattern can occupy the second time-frequency point, and transmit the reference signal.

[0015] Based on the scheme provided in the embodiments of the present application, the first device and the second device can synchronize the first transmit antenna port for transmitting the reference signal through the fourth indication information, the correct measurement of the reference signal by the receiving end (the end receiving the reference signal) can be realized, the corresponding channel state information can be obtained through the response of the reference signal, and channel estimation can be realized.

[0016] In some possible implementation manners, the first pilot pattern is determined according to the MPC, including: determining a to-be-obtained parameter quantity N according to the MPC, N satisfying: N = n*N path , N path represents the number of paths determined according to the MPC, and n is an integer greater than 0; and determining the number of first time-frequency points and a spatial domain compression indication according to N, the spatial domain compression indication being used to indicate whether all transmit antenna ports are used to transmit the reference signal, and whether all receive antenna ports are used to receive the reference signal.

[0017] In some possible implementation manners, the first pilot pattern is determined according to the MPC, including: determining a to-be-obtained parameter quantity N according to the MPC, N satisfying: N = n*N path , N path represents the number of paths determined according to the MPC, and n is an integer greater than 0; and determining the number of first time-frequency points and a spatial domain compression indication according to N, the spatial domain compression indication being used to indicate whether all transmit antenna ports are used to transmit the reference signal, and whether all receive antenna ports are used to receive the reference signal; and determining the number of first transmit antenna ports according to N, the number of first time-frequency points, and the spatial domain compression indication.

[0018] Specifically, the MPC can include at least one of a direction of arrival (DoA), a direction of departure (DoD), a power, or a delay, and the number N can be determined according to at least one of the above path , and N can be determined according to N path . According to N and the sparsity of the channel, it can be determined whether all the transmit antenna ports are used to send reference signals, and further the number of the first transmit antenna ports can be determined.

[0019] Channels in wireless communications are usually affected by multipath propagation, forming complex multipath fading effects. In many cases, most of the paths contribute very little to the propagation of the signal, and a few paths dominate the propagation of the signal, which is called the sparsity of the channel. By utilizing the sparsity of the channel for channel estimation, the complexity of channel estimation can be reduced, and the accuracy of channel estimation can be improved.

[0020] Based on the scheme provided in the embodiments of the present application, the number N of parameters to be obtained is determined by the MPC, the number of first time-frequency points, the spatial compression indication, and the number of first transmit antenna ports are determined by N. On the one hand, without decomposing the channel or the channel matrix, the sparsity of the channel can be utilized for channel feedback, the overhead of sparse channel feedback can be reduced, and the complexity of sparse channel feedback can be reduced. On the other hand, the number of paths is determined according to N, the sparsity of the channel can be utilized for channel estimation, the overhead of channel feedback can be reduced, and the overhead of channel estimation can also be reduced. On the other hand, the number of first transmit antenna ports and the number of first time-frequency points are determined according to N, the time-frequency points and antenna ports occupied by the sending reference signals can be configured on demand, and the resource overhead, measurement overhead, and calculation overhead of channel estimation can be reduced.

[0021] In some possible implementation ways, the number of first time-frequency points and the spatial compression indication are determined according to N, including: the number of second time-frequency points is determined according to N; the number of first time-frequency points and the spatial compression indication are determined according to the number of second time-frequency points, the number of first transmit antenna ports, and a first density, the first density representing the number of time-frequency points occupied by the sending reference signals of each first transmit antenna port; and the number of first time-frequency points is greater than or equal to the number of second time-frequency points, or the number of first time-frequency points is less than the number of second time-frequency points.

[0022] Specifically, the number of the first time-frequency points is equal to the product of the number of the first transmit antenna ports and the first density, and the number of the second time-frequency points can be determined according to N. When the number of the second time-frequency points is greater than or equal to the number of the first time-frequency points, part or all of the second time-frequency points can be selected as the first time-frequency points, and the first device or the second device can send the reference signal by occupying the first time-frequency points; when the number of the second time-frequency points is less than the number of the first time-frequency points, all of the second time-frequency points and other time-frequency points (for example, third time-frequency points) can be selected as the first time-frequency points, and the first device or the second device can send the reference signal by occupying the first time-frequency points.

[0023] Based on the scheme provided in the embodiments of the present application, when the second time-frequency points determined according to N cannot meet the time-frequency points required by the first transmit antenna ports to send the reference signal, the transmission of the reference signal can be realized through the newly added time-frequency points.

[0024] In some possible implementation manners, the number of the second time-frequency points is determined according to a time domain feedback dimension and a frequency domain feedback dimension, the number of the first transmit antenna ports is determined according to a space domain feedback dimension, the time domain feedback dimension The frequency domain feedback dimension The transmit antenna feedback dimension The receive antenna feedback dimension The following conditions need to be met:

[0025] In some possible implementation manners, the number of the first receive antenna ports is determined according to the space domain feedback dimension.

[0026] Specifically, the number of the second time-frequency points is The time domain feedback dimension The frequency domain feedback dimension The transmit antenna feedback dimension The receive antenna feedback dimension The following conditions need to be met:

[0027] For example, the number of the first transmit antenna ports is determined according to the transmit antenna feedback dimension.

[0028] For example, the number of the first receive antenna ports is determined according to the receive antenna feedback dimension.

[0029] Based on the scheme provided in the embodiments of the present application, by On one hand, by determining the feedback dimension for channel measurement of the to-be-acquired parameter quantity, the overhead of channel feedback can be reduced, and the overhead of channel estimation can also be reduced; on the other hand, sparse channel measurement can be implemented while adjusting the time domain feedback dimension, the frequency domain feedback dimension, or the space domain feedback dimension, which is helpful to improve the flexible setting of the measurement dimension in sparse channel measurement.

[0030] In some possible implementation manners, satisfies: satisfies: N Rx and N Tx satisfy: N Rx N Tx N, N Tx denotes the number of transmit antenna ports, N Rx denotes the number of receive antenna ports.

[0031] Specifically, N Tx and N Rx satisfy N Rx N Tx N, the time domain feedback dimension and the frequency domain feedback dimension can be set to 1, and the space domain feedback dimension is adjusted to ensure

[0032] Based on the scheme provided in the embodiments of the present application, N Tx and N Rx satisfy N Rx N Tx N, the time domain feedback dimension and the frequency domain feedback dimension used for transmitting reference signals and feeding back channel information can be compressed preferentially, and a larger space domain feedback dimension can be determined. For a narrowband system with a relatively narrow bandwidth of signals, the result of channel estimation obtained through the larger space domain feedback dimension can more accurately reflect the state of the channel.

[0033] In some possible implementation manners, satisfies: satisfies: N Rx and N Tx satisfy: N Rx N Tx N, N Tx denotes the number of transmit antenna ports, N Rx denotes the number of receive antenna ports.

[0034] Specifically, N Tx and N Rx satisfy N Rx N Tx N, the space domain feedback dimension can not be compressed, and the time domain feedback dimension and the frequency domain feedback dimension are adjusted to ensure and the value of N

[0035] Exemplarily, N Tx represents the number of transmit antenna ports of the first device, N Rx represents the number of receive antenna ports of the second device; or, N Tx represents the number of transmit antenna ports of the second device, N Rx represents the number of receive antenna ports of the first device.

[0036] Based on the scheme provided in the embodiments of the present application, N Tx and N Rx satisfy N Rx N Tx When N

[0037] In some possible implementation manners, satisfy: M represents the rank of the first channel matrix or the number of first eigenvalues of the first channel matrix, the first eigenvalue is an eigenvalue greater than or equal to a first threshold value, and the first channel matrix is determined according to MPC; satisfy: N Tx represents the number of transmit antenna ports, min() represents a minimum value function, and max() represents a maximum value function.

[0038] Exemplarily, N Rx and N Tx satisfy N Rx N Tx When N

[0039] Exemplarily, the first channel matrix can be determined according to MPC, time-frequency domain conversion and a first phase. The first phase can be a randomly set phase value. The rank of the first channel matrix and / or the first eigenvalue of the first channel matrix can be determined according to the first channel matrix, and N and / or

[0040] Exemplarily, the time-frequency domain conversion can be implemented according to a time-frequency domain conversion module.

[0041] The number of non-zero eigenvalues of the channel matrix is equal to the rank of the channel matrix, which indicates the maximum number of independent data streams that the channel can support. The eigenvalue indicates the attenuation degree of the signal in different spatial modes, and the greater the eigenvalue, the smaller the attenuation of the signal in the mode, and the better the channel condition. Strong stream usually refers to the signal stream with a larger eigenvalue in the MIMO system, which indicates that the signal has smaller attenuation in these directions and the channel condition is better.

[0042] Based on the scheme provided in the embodiments of the present application, by limiting the rank of the channel matrix or the first threshold, the spatial domain feedback dimension can be set according to the number of strong streams, which is beneficial to optimizing the transmission of reference signals and the feedback of channel information, and improving the measurement performance of channel estimation and feedback.

[0043] In some possible implementation manners, before determining the first pilot pattern according to the MPC, the method further includes: obtaining antenna indication information, the antenna indication information being used to indicate the number of transmit antenna ports and the number of receive antenna ports of the second device.

[0044] Specifically, the first device can determine the number of transmit antenna ports and the number of receive antenna ports of the second device according to the antenna indication information sent by the second device, and the first device can also determine the number of transmit antenna ports and the number of receive antenna ports of the second device according to the pre-defined or pre-configured antenna indication information.

[0045] For example, according to the number of transmit antenna ports and the number of receive antenna ports of the second device, and the number of transmit antenna ports and the number of receive antenna ports of the first device, the first device can determine the number of transmit antenna ports of the device sending the reference signal as N Tx , and determine the number of receive antenna ports of the device receiving the reference signal as N Rx .

[0046] Based on the scheme provided in the embodiments of the present application, the first device can determine the number of transmit antenna ports and the number of receive antenna ports of the second device according to the antenna indication information, and further can configure the spatial domain feedback dimension.

[0047] In some possible implementation manners, the method further includes: sending first indication information, the first indication information being used to indicate the first pilot pattern, or in other words, the first indication information being used to indicate that the reference signal is transmitted according to the first time-frequency point, and the first indication information including at least one of the following: the first density; time-frequency domain priority indication information; time-frequency domain and / or spatial domain ordering indication information.

[0048] Specifically, the time-frequency domain priority indication information and the time-frequency domain and / or spatial domain ordering indication information can indicate the order of determining the first time-frequency point from the second time-frequency point.

[0049] For example, the time-frequency domain priority indication information can indicate that the first time-frequency point is determined in the second time-frequency point according to a time domain feedback dimension, a frequency domain feedback dimension, and a mapping order of time domain first and frequency domain second or a mapping order of frequency domain first and time domain second; and the time-frequency domain and / or space domain ordering indication information can indicate that the first time-frequency point is determined in the second time-frequency point in a sequence or a reverse sequence in the time-frequency domain and / or the space domain.

[0050] For example, the first indication information can indicate the first pilot pattern. The second device can determine the first pilot pattern according to the first indication information.

[0051] For example, the fourth indication information can include the first indication information.

[0052] Based on the scheme provided in the embodiments of the present application, the first device and the second device can synchronize to determine the ordering of the first time-frequency point through the first indication information, so that the receiving end (the end receiving the pilot signal) can determine a correct pilot pattern, obtain corresponding channel state information through the response of the reference signal, and correctly feed back the channel state information, thereby realizing channel feedback.

[0053] In some possible implementation manners, when the number of the first time-frequency points is greater than the number of the second time-frequency points, the first time-frequency points further include third time-frequency points, and the first indication information further indicates positions of the third time-frequency points.

[0054] For example, the first indication information can indicate the positions and the number of the third time-frequency points.

[0055] Based on the scheme provided in the embodiments of the present application, the first device and the second device can synchronize to transmit the positions of the third time-frequency points of the reference signal through the first indication information, so that the receiving end (the end receiving the pilot signal) can determine a correct pilot pattern, obtain corresponding channel state information through the response of the reference signal, and correctly feed back the channel state information, thereby realizing channel feedback.

[0056] In some possible implementation manners, before the first pilot pattern is determined according to the MPC, the method further includes: randomly selecting the second time-frequency point from the pre-allocated time-frequency resources and randomly selecting the first transmitting antenna port from the pre-allocated antenna ports according to the feedback dimension; or equally spacing selecting the second time-frequency point from the pre-allocated time-frequency resources and equally spacing selecting the first transmitting antenna port from the pre-allocated antenna ports according to the feedback dimension; or selecting the second time-frequency point from a pre-set time-frequency point set and selecting the first transmitting antenna port from a pre-set antenna port set according to the feedback dimension.

[0057] Exemplarily, the pre-allocated time-frequency resources can include system time-frequency resources, and any of the first time-frequency point, the second time-frequency point or the third time-frequency point can include a resource element (RE). For example, one time-frequency point can be regarded as one RE. For example, the RE can include a subcarrier and an orthogonal frequency division multiplexing (OFDM) symbol.

[0058] Based on the scheme provided in the embodiments of the present application, the second time-frequency point and the first transmitting antenna port can be determined by randomly selecting, equally spacing or selecting from a preset set according to the feedback dimension.

[0059] In some possible implementation manners, before determining the first pilot pattern according to the MPC, the method further includes: randomly selecting the first receiving antenna port from the pre-allocated antenna ports according to the feedback dimension; or equally spacing the first receiving antenna port from the pre-allocated antenna ports according to the feedback dimension; or selecting the first receiving antenna port from a preset antenna port set according to the feedback dimension.

[0060] Based on the scheme provided in the embodiments of the present application, the first receiving antenna port can be determined by selecting from a preset set according to the feedback dimension.

[0061] In some possible implementation manners, the method further includes: sending third indication information, the third indication information being used to indicate that the second time-frequency point, the first transmitting antenna port and the first receiving antenna port are determined by using an equally spaced mode or a variable spaced mode in the case that feedback dimensions corresponding to different time instants are different; and when the variable spaced mode is used, the third indication information includes sampling intervals and sampling starting points corresponding to different time instants.

[0062] In a second aspect, a communication method is provided. The method can be performed by a second device, which can refer to a device (e.g., a terminal device or a network device) at a terminal device side or a network device side, a component (e.g., a communication module, a processor, a circuit, a chip, or a chip system) in the device, or a logic module or software that can implement all or part of the functions of the communication device. The terminal device side can include at least one of a terminal device or an AI entity at the terminal device side. The AI entity at the terminal device side can be the terminal device itself or an AI entity serving the terminal device, for example, a server such as an over the top (OTT) server or a cloud server. The network device side can include at least one of a network device or an AI entity at the network device side. The AI entity at the network device side can be the network device itself or an AI entity serving the network device, for example, a radio access network (RAN) intelligent controller (RIC), an operation administration and maintenance (OAM), or a server such as an OTT server or a cloud server. The communication between the servers can be realized through a communication link between the terminal device and the network device, or through other communication devices other than the servers, or through a wired link. For ease of description, the method performed by the second device is described below.

[0063] The method includes: receiving fourth indication information, the fourth indication information being used to indicate a first pilot pattern, the first pilot pattern being determined according to a multipath component (MPC) at a location of the first device, and the first pilot pattern being used to indicate a first time-frequency point, the first time-frequency point being used to send a reference signal; and determining the first pilot pattern according to the fourth indication information.

[0064] Based on the scheme provided in the embodiments of the present application, the first device and the second device can synchronize the first pilot pattern used to send the reference signal through the fourth indication information, the correct pilot pattern can be determined, the first time-frequency point used to send the reference signal can be determined through the first pilot pattern, the correct measurement of the reference signal at the receiving end (the end receiving the reference signal) can be realized, the corresponding channel state information can be obtained through the response of the reference signal, and the channel estimation can be realized.

[0065] In some possible implementation manners, the first pilot pattern is further used to indicate a first transmit antenna port, and the first transmit antenna port is used to send the reference signal.

[0066] In some possible implementation manners, the first pilot pattern is determined according to multipath elements MPC of a location of the first device, and the number of the first transmit antenna ports is determined according to a parameter quantity N to be acquired, the number of the first time-frequency points, and a spatial domain compression indication, the spatial domain compression indication is used to indicate whether all the transmit antenna ports are used to transmit the reference signals and whether all the receive antenna ports are used to receive the reference signals, the number of the first time-frequency points and the spatial domain compression indication are determined according to N, and N is determined according to MPC, and N satisfies: N = n*N path , N path represents a path number determined according to MPC, and n is an integer greater than 0.

[0067] In some possible implementation manners, the number of the first time-frequency points and the spatial domain compression indication are determined according to N, and the number of the first time-frequency points and the spatial domain compression indication are determined according to the number of second time-frequency points, the number of the first transmit antenna ports, and a first density, the number of the second time-frequency points is determined according to N, and the first density represents a number of time-frequency points occupied by the reference signals transmitted by each of the first transmit antenna ports; and the number of the first time-frequency points is greater than or equal to the number of the second time-frequency points, or the number of the first time-frequency points is less than the number of the second time-frequency points.

[0068] In some possible implementation manners, the number of the second time-frequency points is determined according to a time domain feedback dimension and a frequency domain feedback dimension, the number of the first transmit antenna ports is determined according to a spatial domain feedback dimension, the time domain feedback dimension the frequency domain feedback dimension the transmit antenna feedback dimension and the receive antenna feedback dimension satisfies:

[0069] In some possible implementation manners, the number of the first receive antenna ports is determined according to the spatial domain feedback dimension.

[0070] For example, the number of the first transmit antenna ports is determined according to the transmit antenna feedback dimension.

[0071] For example, the number of the first receive antenna ports is determined according to the receive antenna feedback dimension.

[0072] In some possible implementation manners, satisfies: satisfies: N Rx and N Tx satisfies: N Rx N Tx ≥ N, N Tx represents the number of the transmit antenna ports, N Rxdenotes a number of receive antenna ports.

[0073] In some possible implementation manners, satisfies: satisfies: N Rx and N Tx satisfies: N Rx N Tx <N, N Tx denotes a number of transmit antenna ports, N Rx denotes a number of receive antenna ports.

[0074] In some possible implementation manners, satisfies: M denotes a rank of the first channel matrix or a number of first eigenvalues of the first channel matrix, the first eigenvalues being eigenvalues greater than or equal to a first threshold value, the first channel matrix being determined according to the MPC; satisfies: N Tx denotes a number of transmit antenna ports, min() denotes a minimum function, and max() denotes a maximum function.

[0075] In some possible implementation manners, the method further includes: sending antenna indication information, the antenna indication information being used to indicate the number of transmit antenna ports and the number of receive antenna ports of the second device.

[0076] For example, after determining the number of transmit antenna ports and the number of receive antenna ports of the second device, the second device can indicate the number of transmit antenna ports and the number of receive antenna ports of the second device to the first device.

[0077] For example, if the first device knows the number of transmit antenna ports and the number of receive antenna ports of the second device (for example, the first device can determine the number of transmit antenna ports and the number of receive antenna ports of the second device according to preconfigured or predefined information), the second device can not send the antenna indication information.

[0078] In some possible implementation manners, the method further includes: receiving first indication information, the first indication information being used to indicate the first pilot pattern, and the first indication information including at least one of the following: the first density; time-frequency domain priority indication information; time-frequency domain and / or space domain ordering indication information.

[0079] For example, the first indication information can indicate the first pilot pattern. The second device can determine the first pilot pattern according to the first indication information.

[0080] For example, the fourth indication information can include the first indication information.

[0081] In some possible implementation manners, when the number of the first time-frequency points is greater than the number of the second time-frequency points, the first time-frequency points further include third time-frequency points, and the first indication information further indicates positions of the third time-frequency points.

[0082] For example, the first indication information can indicate the positions and the number of the third time-frequency points.

[0083] In some possible implementation manners, the second time-frequency points are randomly selected from pre-allocated time-frequency resources according to the feedback dimension, and the first transmit antenna ports are randomly selected from pre-allocated antenna ports according to the feedback dimension; or the second time-frequency points are equally spaced selected from the pre-allocated time-frequency resources according to the feedback dimension, and the first transmit antenna ports are equally spaced selected from the pre-allocated antenna ports according to the feedback dimension; or the second time-frequency points are selected from a preset time-frequency point set according to the feedback dimension, and the first transmit antenna ports are selected from a preset antenna port set according to the feedback dimension.

[0084] In some possible implementation manners, the first receive antenna ports are randomly selected from pre-allocated antenna ports according to the feedback dimension; or the first receive antenna ports are equally spaced selected from the pre-allocated antenna ports according to the feedback dimension; or the first receive antenna ports are selected from a preset antenna port set according to the feedback dimension.

[0085] In some possible implementation manners, the method further includes: receiving third indication information, the third indication information being used to indicate that, in a case that feedback dimensions corresponding to different time instants are different, the second time-frequency points, the first transmit antenna ports and the first receive antenna ports are determined in an equal interval mode or a variable interval mode; when the second time-frequency points and the first transmit antenna ports are determined in the variable interval mode, the third indication information includes sampling intervals and sampling starting points corresponding to the different time instants.

[0086] In a third aspect, a communication method is provided, which is applied to a first device. The method can be performed by the first device, which can refer to a device (e.g., a terminal device or a network device) at a terminal device side or a network device side, or a component (e.g., a communication module, a processor, a circuit, a chip, or a chip system) in the device, or a logic module or software capable of realizing all or part of the functions of the communication device. The terminal device side can include at least one of a terminal device or an AI entity at the terminal device side. The AI entity at the terminal device side can be the terminal device itself or an AI entity serving the terminal device, for example, a server such as an over the top (OTT) server or a cloud server. The network device side can include at least one of a network device or an AI entity at the network device side. The AI entity at the network device side can be the network device itself or an AI entity serving the network device, for example, a radio access network (RAN) intelligent controller (RIC), an operation administration and maintenance (OAM), or a server such as an OTT server or a cloud server. The communication between servers can be realized through a communication link between the terminal device and the network device, or through other communication devices outside the servers, or through a wired link. For ease of description, the method performed by the first device is described below.

[0087] The method includes determining a multipath component (MPC) of a location where the first device is located, and determining a feedback dimension according to the MPC, the feedback dimension including a time domain feedback dimension and a frequency domain feedback dimension, the time domain feedback dimension and the frequency domain feedback dimension being used to determine a second time-frequency point, the second time-frequency point being used to feed back channel information. That is, the second time-frequency point corresponds to a time-frequency point that needs to feed back channel information when feeding back a channel.

[0088] Specifically, after the first device determines the multipath component (MPC) of the location where the first device is located, the first device can determine a feedback dimension according to the MPC, and a second time-frequency point determined according to the feedback dimension corresponds to a time-frequency point that needs to feed back channel information when feeding back a channel.

[0089] For example, the second time-frequency point can be determined according to the feedback dimension, the time-frequency point determined according to the feedback dimension can indicate a time-frequency point that needs to be measured when channel estimation is performed (that is, the time-frequency point that needs to be measured when channel estimation is performed is the second time-frequency point), or in other words, the second time-frequency point is determined, and it is determined which time-frequency point needs to feed back channel information when channel feedback is performed. When channel estimation is performed by transmitting a reference signal, the time-frequency point corresponding to the second time-frequency point can be preferentially selected.

[0090] Based on the scheme provided in the embodiments of the present application, the feedback dimension for transmitting the reference signal is determined by the MPC, and channel estimation can be implemented by transmitting the reference signal. On the one hand, channel measurement can be implemented without decomposing the channel or the channel matrix, and the overhead of channel estimation can be reduced, and the complexity of channel estimation is reduced. On the other hand, the information of the MPC is fully utilized, and channel estimation is implemented by the MPC, and the overhead of channel estimation and feedback is reduced.

[0091] In some possible implementation manners, the method further includes: sending second indication information, the second indication information being used to indicate the feedback dimension.

[0092] Specifically, after the first device determines the feedback dimension, the first device can send second indication information to the second device, and the second indication information can be used by the second device to determine the feedback dimension for feeding back channel information.

[0093] Based on the scheme provided in the embodiments of the present application, the feedback dimension for feeding back channel information can be synchronized between the first device and the second device through the second indication information, and the time-frequency point that needs to feed back channel information when channel feedback is performed can be determined through the feedback dimension (that is, the time-frequency point that needs to be measured when channel estimation is performed is the second time-frequency point). When channel estimation is performed by transmitting a reference signal, the time-frequency point corresponding to the second time-frequency point can be preferentially selected, the correct feedback of channel state information can be implemented, and channel estimation and feedback can be implemented.

[0094] In some possible implementation manners, the feedback dimension further includes a spatial domain feedback dimension, the spatial domain feedback dimension includes a transmission antenna feedback dimension and a reception antenna feedback dimension, the transmission antenna feedback dimension is used to determine a first transmission antenna port, and the reception antenna feedback dimension is used to determine a first reception antenna port, the first transmission antenna port is used to transmit the reference signal, and the first reception antenna port is used to receive the reference signal.

[0095] Specifically, the spatial domain feedback dimension can be determined according to the MPC, the first transmission antenna port used to transmit the reference signal and the first reception antenna port used to receive the reference signal can be determined according to the spatial domain feedback dimension.

[0096] Based on the scheme provided in the embodiments of the present application, the first device and the second device can synchronize the first transmitting antenna port for transmitting the reference signal and the first receiving antenna port for receiving the reference signal between the first device and the second device through the second indication information, and the corresponding channel state information can be acquired through the response of the reference signal, and the correct feedback of the channel state information is realized, and the channel feedback is realized.

[0097] In some possible implementation manners, the feedback dimension is determined according to the MPC, including: determining the parameter quantity N to be acquired according to the MPC, N satisfying: N = n*N path , N path representing the number of paths determined according to the MPC, n being an integer greater than 0; determining the second time-frequency point and the spatial domain compression indication according to N, the spatial domain compression indication being used for indicating whether all the transmitting antenna ports are used for transmitting the reference signal and whether all the receiving antenna ports are used for receiving the reference signal; and determining the number of the first transmitting antenna ports and the number of the first receiving antenna ports according to N, the second time-frequency point and the spatial domain compression indication.

[0098] Specifically, the MPC can include at least one of DoA, DoD, power or delay, and the number of paths N path can be determined according to at least one of the above items, and N can be determined according to N path . According to N and the sparsity of the channel, whether all the transmitting antenna ports are used for transmitting the reference signal and whether all the receiving antenna ports are used for receiving the reference signal can be determined. Further, the number of the first transmitting antenna ports and the number of the first receiving antenna ports can be determined.

[0099] The channel in wireless communication is usually affected by multipath propagation, forming a complex multipath fading effect. In many cases, most of the paths in these paths make very small contributions to the propagation of the signal, and a few paths dominate the propagation of the signal, which is called the sparsity of the channel. By utilizing the sparsity of the channel for channel estimation, the complexity of channel estimation can be reduced, and the accuracy of channel estimation can be improved.

[0100] Based on the scheme provided in the embodiments of the present application, the parameter quantity N to be acquired is determined by the MPC, and the second time-frequency point, the spatial domain compression indication, the number of the first transmitting antenna port and the number of the first receiving antenna port are determined by N. On the one hand, without decomposing the channel or the channel matrix, the sparse channel feedback can be realized, the overhead of the sparse channel feedback can be reduced, and the complexity of the sparse channel feedback can be reduced. On the other hand, the number of paths is determined according to N, the sparse channel estimation can be realized, the overhead of the channel feedback can be reduced, and the overhead of the channel estimation can be reduced. On the other hand, the number of the first transmitting antenna port, the number of the first receiving antenna port and the second time-frequency point are determined according to N, the time-frequency points and the antenna ports occupied by the feedback channel information can be configured on demand, and the resource overhead, the measurement overhead and the calculation overhead of the channel feedback can be reduced.

[0101] In some possible implementation manners, the number of the second time-frequency points is determined according to the time domain feedback dimension and the frequency domain feedback dimension, the number of the first transmitting antenna port is determined according to the spatial domain feedback dimension, the time domain feedback dimension The frequency domain feedback dimension The transmitting antenna feedback dimension The receiving antenna feedback dimension The following conditions are met:

[0102] In some possible implementation manners, the number of the first receiving antenna port is determined according to the spatial domain feedback dimension.

[0103] Specifically, the number of the second time-frequency points is The time domain feedback dimension The frequency domain feedback dimension The transmitting antenna feedback dimension The receiving antenna feedback dimension The following conditions are met:

[0104] For example, the number of the first transmitting antenna port is determined according to the transmitting antenna feedback dimension.

[0105] For example, the number of the first receiving antenna port is determined according to the receiving antenna feedback dimension.

[0106] Based on the scheme provided in the embodiments of the present application, by On the one hand, by determining the feedback dimension for the channel measurement according to the parameter quantity to be acquired, the overhead of the channel feedback can be reduced, and the overhead of the channel estimation can be reduced. On the other hand, the sparse channel measurement can be realized while adjusting the time domain feedback dimension, the frequency domain feedback dimension or the spatial domain feedback dimension, which is helpful to improve the flexible setting of the measurement dimension in the sparse channel measurement.

[0107] In some possible implementation manners, satisfies: satisfies: N Rx and N Tx satisfies: N Rx N Tx N, N Tx denotes the number of transmit antenna ports, N Rx denotes the number of receive antenna ports.

[0108] Specifically, N Tx and N Rx satisfies N Rx N Tx N, when N Tx can be set to 1, by adjusting the spatial domain feedback dimension, to ensure

[0109] Based on the scheme provided in the embodiments of the present application, N Tx and N Rx satisfies N Rx N Tx N, the time domain feedback dimension and the frequency domain feedback dimension used for transmitting reference signals and feedback channel information can be compressed preferentially, and a larger spatial domain feedback dimension can be determined. For a narrowband system with a relatively narrow bandwidth of signals, the result of channel estimation obtained through the larger spatial domain feedback dimension can more accurately reflect the state of the channel.

[0110] In some possible implementation manners, satisfies: satisfies: N Rx and N Tx satisfies: N Rx N Tx N, N Tx denotes the number of transmit antenna ports, N Rx denotes the number of receive antenna ports.

[0111] Specifically, N Tx and N Rx satisfies N Rx N Tx N, the spatial domain feedback dimension can not be compressed, by adjusting the time domain feedback dimension and the frequency domain feedback dimension, to ensure

[0112] Exemplarily, N Tx denotes the number of transmit antenna ports of the first device, N Rx denotes the number of receive antenna ports of the second device; or, N TxN represents the number of transmit antenna ports of the second device Rx N represents the number of receive antenna ports of the first device.

[0113] Based on the scheme provided in the embodiments of the present application, N Tx and N Rx satisfies N Rx N Tx When N < N, the spatial domain feedback dimension is not compressed, and the maximum spatial domain feedback dimension can be guaranteed. For a narrowband system with a relatively narrow bandwidth, the result of channel estimation obtained through a larger spatial domain feedback dimension can more accurately reflect the state of the channel.

[0114] In some possible implementation manners, satisfies: M represents the rank of the first channel matrix or the number of first eigenvalues of the first channel matrix, the first eigenvalue is an eigenvalue greater than or equal to a first threshold value, and the first channel matrix is determined according to MPC; satisfies: N Tx N represents the number of transmit antenna ports, min() represents a minimum value function, and max() represents a maximum value function.

[0115] Specifically, N Tx and N Rx satisfies N Rx N Tx When N ≥ N, the spatial domain feedback dimension can be adjusted through the rank of the first channel matrix or the eigenvalue.

[0116] For example, the first channel matrix can be determined according to MPC, time-frequency domain conversion, and a first phase. The first phase can be a randomly set phase value. The rank of the first channel matrix and / or the first eigenvalue of the first channel matrix can be determined according to the first channel matrix, and N and / or

[0117] The number of non-zero eigenvalues of a channel matrix is equal to the rank of the channel matrix, which indicates the maximum number of independent data streams that the channel can support. The eigenvalue indicates the attenuation degree of a signal in different spatial modes, and the greater the eigenvalue, the smaller the attenuation of the signal in the mode, and the better the channel condition. Strong streams usually refer to signal streams with large eigenvalues in a MIMO system, indicating that the attenuation of the signal in these directions is small, and the channel condition is good.

[0118] Based on the scheme provided in the embodiments of the present application, by limiting the rank of the channel matrix or the first threshold, the spatial domain feedback dimension can be set according to the number of strong streams, which is beneficial to optimizing the transmission of the reference signal and the feedback of the channel information, and improving the measurement performance of the channel estimation and feedback.

[0119] In some possible implementation ways, before determining the feedback dimension according to the MPC, the method further includes: obtaining antenna indication information, the antenna indication information being used for indicating the number of the transmit antenna ports and the number of the receive antenna ports of the second device.

[0120] Specifically, the first device can determine the number of the transmit antenna ports and the number of the receive antenna ports of the second device according to the antenna indication information sent by the second device, and the first device can also determine the number of the transmit antenna ports and the number of the receive antenna ports of the second device according to the pre-defined or pre-configured antenna indication information.

[0121] For example, according to the number of the transmit antenna ports and the number of the receive antenna ports of the second device, and the number of the transmit antenna ports and the number of the receive antenna ports of the first device, the first device can determine the number of the transmit antenna ports of the device sending the reference signal as N Tx , and determine the number of the receive antenna ports of the device receiving the reference signal as N Rx .

[0122] Based on the scheme provided in the embodiments of the present application, the first device can determine the number of the transmit antenna ports and the number of the receive antenna ports of the second device according to the antenna indication information, and then can configure the spatial domain feedback dimension.

[0123] In some possible implementation ways, after determining the feedback dimension according to the MPC, the method further includes: sending second indication information, the second indication information indicating the feedback dimension.

[0124] Specifically, after determining the feedback dimension, the first device can send the second indication information to the second device.

[0125] For example, the second indication information can be used for determining the position of the second time-frequency point, the spatial domain compression indication, the position of the first transmit antenna port and the position of the first receive antenna port.

[0126] For example, the second indication information can indicate the position and the number of the second time-frequency point, and / or the second indication information can indicate the position and the number of the first transmit antenna port, and / or the second indication information can indicate the position and the number of the first receive antenna port.

[0127] For example, the fourth indication information can include the second indication information.

[0128] Based on the scheme provided in the embodiments of the present application, the first device and the second device can synchronize the time-frequency points of the channel information to be fed back, the space compression indication, the position of the first transmitting antenna port, and the position of the first receiving antenna port through the second indication information, so as to realize correct measurement of the reference signal by the receiving end (the end receiving the reference signal), obtain the corresponding channel state information through the response of the reference signal, and realize correct feedback of the channel state information and channel estimation and feedback.

[0129] In some possible implementation manners, the method further includes: sending first indication information, the first indication information being used to indicate a first pilot pattern, and the first indication information including at least one of the following: a first density; time-frequency domain priority indication information; and time-frequency domain and / or space domain ordering indication information.

[0130] Specifically, the time-frequency domain priority indication information and the time-frequency domain and / or space domain ordering indication information can indicate an order of determining the first time-frequency points from the second time-frequency points.

[0131] For example, the time-frequency domain priority indication information can indicate that the first time-frequency points are determined from the second time-frequency points according to a time domain feedback dimension, a frequency domain feedback dimension, and a mapping order of time domain first and frequency domain second or a mapping order of frequency domain first and time domain second; and the time-frequency domain and / or space domain ordering indication information can indicate that the first time-frequency points are determined from the second time-frequency points in an order or a reverse order in the time-frequency domain and / or the space domain.

[0132] Based on the scheme provided in the embodiments of the present application, the first device and the second device can synchronize the ordering of the first time-frequency points through the first indication information, so as to realize correct determination of the pilot pattern by the receiving end (the end receiving the pilot signal), obtain the corresponding channel state information through the response of the reference signal, and realize correct feedback of the channel state information and channel feedback.

[0133] In some possible implementation manners, when the number of the first time-frequency points is greater than the number of the second time-frequency points, the first time-frequency points further include third time-frequency points, and the first indication information further indicates the positions of the third time-frequency points.

[0134] For example, the first indication information can indicate the positions and the number of the third time-frequency points.

[0135] Based on the scheme provided in the embodiments of the present application, the first device and the second device can synchronize the positions of the third time-frequency points of the reference signal through the first indication information, so as to realize correct determination of the pilot pattern by the receiving end (the end receiving the pilot signal), obtain the corresponding channel state information through the response of the reference signal, and realize correct feedback of the channel state information and channel feedback.

[0136] In some possible implementation manners, the method further includes: sending third indication information, the third indication information being used to indicate that the equal-interval mode or the variable-interval mode is adopted to determine the second time-frequency point, the first transmitting antenna port and the first receiving antenna port in a case where feedback dimensions corresponding to different time instants are different; and when the variable-interval mode is adopted, the third indication information includes sampling intervals and sampling starting points corresponding to different time instants.

[0137] In a fourth aspect, a communication method is provided. The method can be performed by a second device, which can refer to a device (for example, a terminal device or a network device) on a terminal device side or a network device side, a component (for example, a communication module, a processor, a circuit, a chip, or a chip system) in the device, or a logic module or software that can implement all or part of the functions of the communication device. The terminal device side can include at least one of a terminal device or an AI entity on the terminal device side. The AI entity on the terminal device side can be the terminal device itself or an AI entity serving the terminal device, for example, a server such as an over the top (OTT) server or a cloud server. The network device side can include at least one of a network device or an AI entity on the network device side. The AI entity on the network device side can be the network device itself or an AI entity serving the network device, for example, a radio access network (RAN) intelligent controller (RIC), an operation administration and maintenance (OAM), or a server such as an OTT server or a cloud server. The communication between servers can be realized through a communication link between the terminal device and the network device, or through other communication devices other than the servers, or through a wired link. For ease of description, the method performed by the second device is taken as an example in the following description.

[0138] The method includes: receiving second indication information, the second indication information being used to indicate a feedback dimension, the feedback dimension being determined according to a multipath element (MPC) of a location of the first device, the feedback dimension including a time-domain feedback dimension and a frequency-domain feedback dimension, the time-domain feedback dimension and the frequency-domain feedback dimension being used to determine a second time-frequency point, the second time-frequency point being used to feed back channel information; and determining the feedback dimension according to the second indication information.

[0139] Specifically, the second time-frequency point corresponds to a time-frequency point at which channel information needs to be fed back during channel feedback.

[0140] For example, the second time-frequency point can be determined according to the feedback dimension, the time-frequency point determined according to the feedback dimension can indicate a time-frequency point that needs to be measured when channel estimation is performed (that is, the time-frequency point that needs to be measured when channel estimation is performed is the second time-frequency point), or in other words, the second time-frequency point is determined, and it is determined which time-frequency points need to feed back channel information when channel feedback is performed. When channel estimation is performed by transmitting a reference signal, time-frequency points corresponding to the second time-frequency point can be preferentially selected.

[0141] Based on the scheme provided in the embodiments of the present application, the first device and the second device can synchronize the feedback dimension for transmitting the reference signal through the second indication information, the second time-frequency point for transmitting the reference signal can be determined through the feedback dimension, it can be determined which time-frequency points need to feed back channel information when channel feedback is performed, the corresponding channel state information can be obtained through the response of the reference signal, and channel estimation is implemented.

[0142] In some possible implementation manners, the feedback dimension further includes a spatial domain feedback dimension, the spatial domain feedback dimension includes a first transmit antenna port feedback dimension and a first receive antenna port feedback dimension, the first transmit antenna port feedback dimension is used to determine a first transmit antenna port, and the first receive antenna port feedback dimension is used to determine a first receive antenna port, the first transmit antenna port is used to transmit the reference signal, and the first receive antenna port is used to receive the reference signal.

[0143] In some possible implementation manners, the feedback dimension is determined according to a multipath component (MPC) of a location where the first device is located, and includes that: the number of the first transmit antenna ports and the number of the first receive antenna ports are determined according to a to-be-acquired parameter quantity N, a second time-frequency point and a spatial domain compression indication, the spatial domain compression indication is used to indicate whether all the transmit antenna ports are used to transmit the reference signal and whether all the receive antenna ports are used to receive the reference signal, the second time-frequency point and the spatial domain compression indication are determined according to N, N is determined according to the MPC, and N satisfies: N = n*N path , N path n represents a number of paths determined according to the MPC, and n is an integer greater than 0.

[0144] In some possible implementation manners, the number of the first time-frequency points and the spatial domain compression indication are determined according to N, and include that: the number of the first time-frequency points and the spatial domain compression indication are determined according to the number of the second time-frequency points, the number of the first transmit antenna ports and a first density, the number of the second time-frequency points is determined according to N, and the first density represents a number of time-frequency points occupied by the first transmit antenna ports for transmitting the reference signal; and the number of the first time-frequency points is greater than or equal to the number of the second time-frequency points, or the number of the first time-frequency points is less than the number of the second time-frequency points.

[0145] In some possible implementation manners, the number of the second time-frequency points is determined according to a time domain feedback dimension and a frequency domain feedback dimension, the number of the first transmitting antenna port is determined according to a space domain feedback dimension, the time domain feedback dimension the frequency domain feedback dimension the transmitting antenna feedback dimension and the receiving antenna feedback dimension satisfies:

[0146] In some possible implementation manners, the number of the first receiving antenna port is determined according to the space domain feedback dimension.

[0147] Specifically, the number of the second time-frequency points is the time domain feedback dimension the frequency domain feedback dimension the transmitting antenna feedback dimension and the receiving antenna feedback dimension needs to satisfy:

[0148] For example, the number of the first transmitting antenna port is determined according to the transmitting antenna feedback dimension.

[0149] For example, the number of the first receiving antenna port is determined according to the receiving antenna feedback dimension.

[0150] In some possible implementation manners, satisfies: satisfies: N Tx and N Rx satisfies: N Rx N Tx N, N Tx represents the number of the transmitting antenna port, N Rx represents the number of the receiving antenna port.

[0151] In some possible implementation manners, satisfies: satisfies: N Tx and N Rx satisfies: N Rx N Tx N, N Tx represents the number of the transmitting antenna port, N Rx represents the number of the receiving antenna port.

[0152] In some possible implementation manners, satisfies: M represents a rank of the first channel matrix or a number of first eigenvalues of the first channel matrix, the first eigenvalues are eigenvalues greater than or equal to a first threshold value, and the first channel matrix is determined according to the MPC; satisfies: N Tx N represents a number of transmit antenna ports, min() represents a minimum value function, and max() represents a maximum value function.

[0153] In some possible implementation manners, before determining the feedback dimension according to the MPC, the method further includes: sending antenna indication information, the antenna indication information being used for indicating the number of transmit antenna ports and the number of receive antenna ports of the second device.

[0154] In some possible implementation manners, after determining the feedback dimension according to the MPC, the method further includes: receiving second indication information, the second indication information indicating the feedback dimension.

[0155] In some possible implementation manners, the method further includes: receiving first indication information, the first indication information being used for indicating the first pilot pattern, and the first indication information including at least one of the following: the first density; time-frequency domain priority indication information; and ordering indication information of time-frequency domain and / or space domain.

[0156] In some possible implementation manners, when the number of first time-frequency points is greater than the number of second time-frequency points, the first time-frequency points further include third time-frequency points, and the first indication information further indicates positions of the third time-frequency points.

[0157] In some possible implementation manners, the method further includes: receiving third indication information, the third indication information being used for indicating that, in a case where corresponding feedback dimensions at different time instants are different, a second time-frequency point, a first transmit antenna port and a first receive antenna port are determined by using an equal interval mode or a variable interval mode; and when the variable interval mode is used, the third indication information includes sampling intervals and sampling starting points corresponding to the different time instants.

[0158] In the method in the first aspect to the fourth aspect and any possible implementation manner of the first aspect to the fourth aspect, when the first device is a device on a terminal equipment side, the second device can be a device on a network equipment side; when the first device is a device on a network equipment side, the second device can be a device on a terminal equipment side; when the first device is a first terminal equipment, the second device can be another terminal equipment other than the first terminal equipment; and when the first device is a first network equipment, the second device can be another network equipment other than the first network equipment.

[0159] In a fifth aspect, a communication apparatus is provided with the function of the first aspect, for example, the communication apparatus includes a module or unit or means corresponding to the operations of the first aspect, which can be implemented by software, or by hardware, or by a combination of software and hardware.

[0160] For example, the communication apparatus can be the first apparatus, for example, a module or unit (for example, a chip, or a chip system, or a circuit) corresponding to the method or operation or step or action described in the first aspect.

[0161] In some possible implementation manners, the communication apparatus includes a processing unit. The processing unit is configured to determine a multipath component (MPC) of a location where the first apparatus is located, and determine a first pilot pattern according to the MPC, the first pilot pattern being used to indicate a first time-frequency point used to send a reference signal.

[0162] In some possible implementation manners, the communication apparatus further includes a transceiver unit (or a communication module) connected to the processing unit. The transceiver unit is configured to send fourth indication information, the fourth indication information being used to indicate the first pilot pattern.

[0163] In some possible implementation manners, the first pilot pattern is further used to indicate a first transmit antenna port used to send the reference signal.

[0164] In some possible implementation manners, the processing unit is specifically configured to determine a parameter quantity N to be acquired according to the MPC, the N satisfying: N = n * N path , N path represents a number of paths determined according to the MPC, and n is an integer greater than 0; determine a number of the first time-frequency points and a spatial domain compression indication according to the N, the spatial domain compression indication being used to indicate whether all the transmit antenna ports are used to send the reference signal, and whether all the receive antenna ports are used to receive the reference signal; and determine a number of the first transmit antenna ports according to the N, the number of the first time-frequency points, and the spatial domain compression indication.

[0165] In some possible implementation manners, the processing unit is specifically configured to determine a number of second time-frequency points according to the N; and determine the number of the first time-frequency points and the spatial domain compression indication according to the number of the second time-frequency points, the number of the first transmit antenna ports, and a first density, the first density representing a number of time-frequency points occupied by the reference signal sent by each of the first transmit antenna ports; and the number of the first time-frequency points is greater than or equal to the number of the second time-frequency points, or the number of the first time-frequency points is less than the number of the second time-frequency points.

[0166] In some possible implementation manners, the number of the second time-frequency points is determined according to a time domain feedback dimension and a frequency domain feedback dimension, the number of the first transmit antenna ports is determined according to a space domain feedback dimension, the time domain feedback dimension the frequency domain feedback dimension the transmit antenna feedback dimension and the receive antenna feedback dimension satisfies:

[0167] In some possible implementation manners, the number of the first receive antenna ports is determined according to the space domain feedback dimension.

[0168] For example, the number of the first transmit antenna ports is determined according to the transmit antenna feedback dimension.

[0169] For example, the number of the first receive antenna ports is determined according to the receive antenna feedback dimension.

[0170] In some possible implementation manners, satisfies: satisfies: N Tx and N Rx satisfies: N Rx N Tx N Tx represents the number of transmit antenna ports, N Rx represents the number of receive antenna ports.

[0171] In some possible implementation manners, satisfies: satisfies: N Tx and N Rx satisfies: N Rx N Tx N Tx represents the number of transmit antenna ports, N Rx represents the number of receive antenna ports.

[0172] In some possible implementation manners, satisfies: M represents a rank of the first channel matrix or a number of first eigenvalues of the first channel matrix, the first eigenvalue is an eigenvalue greater than or equal to a first threshold value, and the first channel matrix is determined according to the MPC; satisfies: N Tx represents the number of transmit antenna ports, min() represents a minimum value function, and max() represents a maximum value function.

[0173] In some possible implementation manners, before determining the first pilot pattern according to the MPC, the transceiver is further configured to: obtain antenna indication information, the antenna indication information being used to indicate the number of the transmit antenna ports and the number of the receive antenna ports of the second device.

[0174] For example, the first device can determine the number of the transmit antenna ports and the number of the receive antenna ports of the second device according to the antenna indication information received by the transceiver.

[0175] In some possible implementation manners, before determining the first pilot pattern according to the MPC, the processing unit is further configured to: obtain antenna indication information, the antenna indication information being used to indicate the number of the transmit antenna ports and the number of the receive antenna ports of the second device.

[0176] For example, the first device can determine the number of the transmit antenna ports and the number of the receive antenna ports of the second device according to the processing unit from pre-configured or pre-defined information.

[0177] In some possible implementation manners, the transceiver is further configured to: send first indication information, the first indication information being used to indicate the first pilot pattern, and the first indication information including at least one of the following: the first density; time-frequency domain priority indication information; and ordering indication information of time-frequency domain and / or space domain.

[0178] In some possible implementation manners, when the number of the first time-frequency points is greater than the number of the second time-frequency points, the first time-frequency points further include third time-frequency points, and the first indication information further indicates the positions of the third time-frequency points.

[0179] In some possible implementation manners, the processing unit is further configured to: randomly select the second time-frequency points from pre-allocated time-frequency resources and randomly select the first transmit antenna ports from pre-allocated antenna ports according to the feedback dimension; or equally interval select the second time-frequency points from the pre-allocated time-frequency resources and equally interval select the first transmit antenna ports from the pre-allocated antenna ports according to the feedback dimension; or select the second time-frequency points from a preset time-frequency point set and select the first transmit antenna ports from a preset antenna port set according to the feedback dimension.

[0180] In some possible implementation manners, before determining the first pilot pattern according to the MPC, the processing unit is further configured to: randomly select the first receive antenna ports from pre-allocated antenna ports according to the feedback dimension; or equally interval select the first receive antenna ports from the pre-allocated antenna ports according to the feedback dimension; or select the first receive antenna ports from a preset antenna port set according to the feedback dimension.

[0181] In some possible implementation manners, the transceiving unit is further configured to: send third indication information, the third indication information being used to indicate that the equal-interval mode or the variable-interval mode is used to determine the second time-frequency point, the first transmitting antenna port and the first receiving antenna port in a case where feedback dimensions corresponding to different time instants are different; and the third indication information comprises sampling intervals and sampling starting points corresponding to different time instants when the variable-interval mode is used.

[0182] In some possible implementation manners, the processing unit comprises a processor.

[0183] In some possible implementation manners, the transceiving unit comprises a transceiver.

[0184] In a sixth aspect, a communication apparatus is provided, and the communication apparatus has the functions of the second aspect, for example, the communication apparatus comprises modules or units or means corresponding to the operations of the second aspect, and the modules or units or means are specifically implemented through software, or through hardware, or through a combination of software and hardware.

[0185] For example, the communication apparatus can be the second apparatus, for example, a module or unit (for example, a chip, or a chip system, or a circuit) corresponding to the method or operation or step or action described in the second aspect.

[0186] In some possible implementation manners, the communication apparatus comprises a transceiving unit (or a communication module) and a processing unit (or a processing module) connected with the transceiving unit. The transceiving unit is configured to: receive fourth indication information, the fourth indication information being used to indicate a first pilot pattern, the first pilot pattern being determined according to multiple path elements (MPC) of a location of the first apparatus, and the first pilot pattern being used to indicate a first time-frequency point, the first time-frequency point being used to send a reference signal, and the reference signal being used for channel measurement. The processing unit is configured to: determine the first pilot pattern according to the fourth indication information.

[0187] In some possible implementation manners, the first pilot pattern is further used to indicate a first transmitting antenna port, and the first transmitting antenna port is used to send the reference signal.

[0188] In some possible implementation manners, the first pilot pattern is determined according to the MPC of the location of the first apparatus, and the determination comprises: the number of the first transmitting antenna ports is determined according to a to-be-acquired parameter quantity N, the number of the first time-frequency points and a spatial compression indication, the spatial compression indication being used to indicate whether all the transmitting antenna ports are used to send the reference signal, and whether all the receiving antenna ports are used to receive the reference signal; the number of the first time-frequency points and the spatial compression indication are determined according to N, and N is determined according to the MPC, and N satisfies: N = n*N path , N pathrepresents a rank determined according to the MPC, n is an integer greater than 0.

[0189] In some possible implementation, the number of the first time-frequency points and the spatial domain compression indication are determined according to N, including: the number of the first time-frequency points and the spatial domain compression indication are determined according to the number of the second time-frequency points, the number of the first transmitting antenna ports and the first density, the number of the second time-frequency points is determined according to N, and the first density represents the number of time-frequency points occupied by each first transmitting antenna port for transmitting the reference signal; wherein the number of the first time-frequency points is greater than or equal to the number of the second time-frequency points, or the number of the first time-frequency points is less than the number of the second time-frequency points.

[0190] In some possible implementation, the number of the second time-frequency points is determined according to the time domain feedback dimension and the frequency domain feedback dimension, the number of the first transmitting antenna ports is determined according to the spatial domain feedback dimension, the time domain feedback dimension the frequency domain feedback dimension the transmitting antenna feedback dimension and the receiving antenna feedback dimension satisfies:

[0191] In some possible implementation, the number of the first receiving antenna ports is determined according to the spatial domain feedback dimension.

[0192] For example, the number of the first transmitting antenna ports is determined according to the transmitting antenna feedback dimension.

[0193] For example, the number of the first receiving antenna ports is determined according to the receiving antenna feedback dimension.

[0194] In some possible implementation, satisfies: satisfies: N Tx and N Rx satisfies: N Rx N Tx N, N Tx represents the number of transmitting antenna ports, N Rx represents the number of receiving antenna ports.

[0195] In some possible implementation, satisfies: satisfies: N Tx and N Rx satisfies: N Rx N Tx N, N Tx represents the number of transmitting antenna ports, N Rx represents the number of receiving antenna ports.

[0196] In some possible implementation manners, satisfies: M represents a rank of the first channel matrix or a number of first eigenvalues of the first channel matrix, the first eigenvalues are eigenvalues greater than or equal to a first threshold value, and the first channel matrix is determined according to MPC; satisfies: N Tx represents a number of transmit antenna ports, min() represents a minimum value function, and max() represents a maximum value function.

[0197] In some possible implementation manners, the transceiver is further configured to: send antenna indication information, the antenna indication information being used to indicate the number of transmit antenna ports and the number of receive antenna ports of the second device.

[0198] In some possible implementation manners, the transceiver is further configured to: receive first indication information, the first indication information being used to indicate the first pilot pattern, and the first indication information including at least one of the following: the first density; time-frequency domain priority indication information; and ordering indication information of time-frequency domain and / or space domain.

[0199] In some possible implementation manners, when the number of first time-frequency points is greater than the number of second time-frequency points, the first time-frequency points further include third time-frequency points, and the first indication information further indicates positions of the third time-frequency points.

[0200] In some possible implementation manners, the second time-frequency points are randomly selected from pre-allocated time-frequency resources according to the feedback dimension, and the first transmit antenna ports are randomly selected from pre-allocated antenna ports according to the feedback dimension; or the second time-frequency points are equally spaced selected from the pre-allocated time-frequency resources according to the feedback dimension, and the first transmit antenna ports are equally spaced selected from the pre-allocated antenna ports according to the feedback dimension; or the second time-frequency points are selected from a preset time-frequency point set according to the feedback dimension, and the first transmit antenna ports are selected from a preset antenna port set according to the feedback dimension.

[0201] In some possible implementation manners, the first receive antenna ports are randomly selected from pre-allocated antenna ports according to the feedback dimension; or the first receive antenna ports are equally spaced selected from the pre-allocated antenna ports according to the feedback dimension; or the first receive antenna ports are selected from a preset antenna port set according to the feedback dimension.

[0202] In some possible implementation manners, the transceiving unit is further configured to receive third indication information, the third indication information being used to indicate that the second time-frequency point, the first transmission antenna port and the first reception antenna port are determined by using the equal interval mode or the variable interval mode in a case that feedback dimensions corresponding to different time instants are different; and the third indication information comprises sampling intervals and sampling starting points corresponding to different time instants when the second time-frequency point, the first transmission antenna port and the first reception antenna port are determined by using the variable interval mode.

[0203] In some possible implementation manners, the processing unit comprises a processor.

[0204] In some possible implementation manners, the transceiving unit comprises a transceiver.

[0205] In a seventh aspect, a communication apparatus is provided with the functions of the third aspect, for example, the communication apparatus comprises modules or units or means corresponding to the operations of the third aspect, which can be implemented by software or hardware, or by a combination of software and hardware.

[0206] For example, the communication apparatus can be the first apparatus, for example, a module or unit (for example, a chip, a chip system or a circuit) corresponding to the method or operation or step or action described in the third aspect.

[0207] In some possible implementation manners, the communication apparatus comprises a processing unit (or a processing module). The processing unit is configured to determine a multipath element (MPC) of a location of the first apparatus, and determine feedback dimensions according to the MPC, the feedback dimensions comprising a time domain feedback dimension and a frequency domain feedback dimension, the time domain feedback dimension and the frequency domain feedback dimension being used to determine a second time-frequency point, the second time-frequency point being used to feed back channel information. Specifically, the second time-frequency point corresponds to a time-frequency point at which the channel information needs to be fed back at a channel feedback time, and a reference signal can be used for channel measurement.

[0208] In some possible implementation manners, the communication apparatus further comprises a transceiving unit (or a communication module) connected to the processing unit. The transceiving unit is configured to send second indication information, the second indication information being used to indicate the feedback dimensions.

[0209] In some possible implementation manners, the feedback dimensions further comprise a spatial domain feedback dimension, the spatial domain feedback dimension comprising a transmission antenna feedback dimension and a reception antenna feedback dimension, the transmission antenna feedback dimension being used to determine a first transmission antenna port, and the reception antenna feedback dimension being used to determine a first reception antenna port, the first transmission antenna port being used to send a reference signal, and the first reception antenna port being used to receive the reference signal.

[0210] In some possible implementation manners, the processing unit is specifically configured to: determine the parameter quantity N to be acquired according to the MPC, N satisfying: N = n * N path , N path denotes the number of diameters determined according to the MPC, n is an integer greater than 0; determine the second time-frequency point and the spatial domain compression indication according to N, the spatial domain compression indication being used to indicate whether all the transmit antenna ports are used for transmitting the reference signal and whether all the receive antenna ports are used for receiving the reference signal; and determine the number of the first transmit antenna ports and the number of the first receive antenna ports according to N, the second time-frequency point and the spatial domain compression indication.

[0211] In some possible implementation manners, the number of the second time-frequency points is determined according to the time domain feedback dimension and the frequency domain feedback dimension, the number of the first transmit antenna ports is determined according to the spatial domain feedback dimension, the time domain feedback dimension the frequency domain feedback dimension the transmit antenna feedback dimension and the receive antenna feedback dimension satisfy:

[0212] In some possible implementation manners, the number of the first receive antenna ports is determined according to the spatial domain feedback dimension.

[0213] For example, the number of the first transmit antenna ports is determined according to the transmit antenna feedback dimension.

[0214] For example, the number of the first receive antenna ports is determined according to the receive antenna feedback dimension.

[0215] In some possible implementation manners, satisfy: satisfy: N Tx and N Rx satisfy: N Rx N Tx N Tx denotes the number of the transmit antenna ports, N Rx denotes the number of the receive antenna ports.

[0216] In some possible implementation manners, satisfy: satisfy: N Tx and N Rx satisfy: N Rx N Tx N Tx denotes the number of the transmit antenna ports, N Rx denotes the number of the receive antenna ports.

[0217] In some possible implementation manners, satisfies: M represents a rank of the first channel matrix or a number of first eigenvalues of the first channel matrix, the first eigenvalues are eigenvalues greater than or equal to a first threshold value, and the first channel matrix is determined according to the MPC; satisfies: N Tx represents a number of transmit antenna ports, min() represents a minimum value function, and max() represents a maximum value function.

[0218] In some possible implementation manners, before determining the feedback dimension according to the MPC, the transceiver unit is further configured to: obtain antenna indication information, the antenna indication information being used to indicate the number of transmit antenna ports and the number of receive antenna ports of the second device.

[0219] For example, the first device can determine the number of transmit antenna ports and the number of receive antenna ports of the second device according to the antenna indication information received by the transceiver unit.

[0220] In some possible implementation manners, before determining the feedback dimension according to the MPC, the processing unit is further configured to: obtain antenna indication information, the antenna indication information being used to indicate the number of transmit antenna ports and the number of receive antenna ports of the second device.

[0221] For example, the first device can determine the number of transmit antenna ports and the number of receive antenna ports of the second device according to the processing unit from preconfigured or predefined information.

[0222] In some possible implementation manners, the transceiver unit is further configured to: send second indication information, the second indication information indicating the feedback dimension.

[0223] For example, the second indication information can indicate the positions and the number of the second time-frequency points, and / or the second indication information can indicate the positions and the number of the first transmit antenna ports, and / or the second indication information can indicate the positions and the number of the first receive antenna ports.

[0224] In some possible implementation manners, the transceiver unit is further configured to: send first indication information, the first indication information being used to indicate the first pilot pattern, and the first indication information including at least one of the following: the first density; time-frequency domain priority indication information; and ordering indication information of time-frequency domain and / or space domain.

[0225] In some possible implementation manners, when the number of the first time-frequency points is greater than the number of the second time-frequency points, the first time-frequency points further include third time-frequency points, and the first indication information further indicates positions of the third time-frequency points.

[0226] In some possible implementation manners, the processing unit is further configured to: randomly select the second time-frequency point from the pre-allocated time-frequency resources and randomly select the first transmitting antenna port from the pre-allocated antenna ports according to the feedback dimension; or equally interval select the second time-frequency point from the pre-allocated time-frequency resources and equally interval select the first transmitting antenna port from the pre-allocated antenna ports according to the feedback dimension; or select the second time-frequency point from a preset time-frequency point set and select the first transmitting antenna port from a preset antenna port set according to the feedback dimension.

[0227] In some possible implementation manners, after determining the feedback dimension according to the MPC, the processing unit is further configured to: randomly select the first receiving antenna port from the pre-allocated antenna ports according to the feedback dimension; or equally interval select the first receiving antenna port from the pre-allocated antenna ports according to the feedback dimension; or select the first receiving antenna port from a preset antenna port set according to the feedback dimension.

[0228] In some possible implementation manners, the transceiving unit is further configured to: send third indication information, the third indication information being used to indicate that the second time-frequency point, the first transmitting antenna port and the first receiving antenna port are determined by using the equally interval mode or the variable interval mode in the case that the feedback dimensions corresponding to different time instants are different; when the variable interval mode is used, the third indication information includes sampling intervals and sampling starting points corresponding to different time instants.

[0229] In some possible implementation manners, the processing unit includes a processor.

[0230] In some possible implementation manners, the transceiving unit includes a transceiver.

[0231] In an eighth aspect, a communication apparatus is provided, and the communication apparatus has functions of implementing the fourth aspect, for example, the communication apparatus includes a module or unit or means corresponding to the operations of the fourth aspect, and the module or unit or means can be implemented by software, or by hardware, or by a combination of software and hardware.

[0232] For example, the communication apparatus can be the second apparatus, for example, a module or unit (for example, a chip, or a chip system, or a circuit) corresponding to the method or operation or step or action described in the fourth aspect.

[0233] In some possible implementation manners, the communication apparatus includes a transceiver (or a communication module) and a processing unit (or a processing module) connected with the transceiver. The transceiver is configured to: receive second indication information, the second indication information being used to indicate a feedback dimension, the feedback dimension being determined according to a multipath element (MPC) of a location of the first apparatus, the feedback dimension including a time domain feedback dimension and a frequency domain feedback dimension, the time domain feedback dimension and the frequency domain feedback dimension being used to determine a second time-frequency point, the second time-frequency point being used to feed back channel information; and the processing unit is configured to: determine the feedback dimension according to the second indication information. Specifically, the second time-frequency point corresponds to a time-frequency point at which the channel information needs to be fed back in channel feedback, and the reference signal can be used for channel measurement.

[0234] In some possible implementation manners, the feedback dimension further includes a space domain feedback dimension, the space domain feedback dimension including a transmit antenna feedback dimension and a receive antenna feedback dimension, the transmit antenna feedback dimension being used to determine a first transmit antenna port, and the receive antenna feedback dimension being used to determine a first receive antenna port, the first transmit antenna port being used to transmit the reference signal, and the first receive antenna port being used to receive the reference signal.

[0235] In some possible implementation manners, the feedback dimension is determined according to the MPC of the location of the first apparatus, including: the number of the first transmit antenna ports and the number of the first receive antenna ports are determined according to a to-be-acquired parameter quantity N, the second time-frequency point and a space domain compression indication, the space domain compression indication being used to indicate whether all the transmit antenna ports are used to transmit the reference signal, and whether all the receive antenna ports are used to receive the reference signal; the second time-frequency point and the space domain compression indication are determined according to N, N being determined according to the MPC, and N satisfying: N = n * N path path wherein n is an integer greater than 0.

[0236] In some possible implementation manners, the number of the second time-frequency points is determined according to the time domain feedback dimension and the frequency domain feedback dimension, the number of the first transmit antenna ports is determined according to the space domain feedback dimension, the time domain feedback dimension the frequency domain feedback dimension the transmit antenna feedback dimension and the receive antenna feedback dimension satisfying:

[0237] In some possible implementation manners, the number of the first receive antenna ports is determined according to the space domain feedback dimension.

[0238] For example, the number of the first transmit antenna ports is determined according to the transmit antenna feedback dimension.

[0239] ​Exemplarily, the number of the first receiving antenna ports is determined according to the receiving antenna feedback dimension.

[0240] In some possible implementation manners, satisfies: satisfies: N Tx and N Rx satisfies: N Rx N Tx N, N Tx denotes the number of the transmitting antenna ports, N Rx denotes the number of the receiving antenna ports.

[0241] In some possible implementation manners, satisfies: satisfies: N Tx and N Rx satisfies: N Rx N Tx N, N Tx denotes the number of the transmitting antenna ports, N Rx denotes the number of the receiving antenna ports.

[0242] In some possible implementation manners, satisfies: M denotes the rank of the first channel matrix or the number of the first eigenvalues of the first channel matrix, the first eigenvalue is an eigenvalue greater than or equal to a first threshold value, and the first channel matrix is determined according to the MPC; satisfies: N Tx denotes the number of the transmitting antenna ports, min() denotes a minimum value function, and max() denotes a maximum value function.

[0243] In some possible implementation manners, the transceiver is further configured to: send antenna indication information, the antenna indication information being used to indicate the number of the transmitting antenna ports and the number of the receiving antenna ports of the second device.

[0244] In some possible implementation manners, the transceiver is further configured to: receive second indication information, the second indication information indicating the position of the feedback dimension, the space domain compression indication, the position of the first transmitting antenna port and the position of the first receiving antenna port.

[0245] In some possible implementation manners, the transceiver is further configured to: receive first indication information, the first indication information being used to indicate the first pilot pattern, and the first indication information including at least one of the following: the first density; time-frequency domain priority indication information; and ordering indication information of the time-frequency domain and / or the space domain.

[0246] In some possible implementation manners, when the number of the first time-frequency points is greater than the number of the second time-frequency points, the first time-frequency points further include third time-frequency points, and the first indication information further indicates positions of the third time-frequency points.

[0247] In some possible implementation manners, the second time-frequency point is randomly selected from pre-allocated time-frequency resources according to the feedback dimension, and the first transmission antenna port is randomly selected from pre-allocated antenna ports according to the feedback dimension; or, the second time-frequency point is equally spaced selected from the pre-allocated time-frequency resources according to the feedback dimension, and the first transmission antenna port is equally spaced selected from the pre-allocated antenna ports according to the feedback dimension; or, the second time-frequency point is selected from a preset time-frequency point set according to the feedback dimension, and the first transmission antenna port is selected from a preset antenna port set according to the feedback dimension.

[0248] In some possible implementation manners, the first reception antenna port is randomly selected from pre-allocated antenna ports according to the feedback dimension; or, the first reception antenna port is equally spaced selected from the pre-allocated antenna ports according to the feedback dimension; or, the first reception antenna port is selected from a preset antenna port set according to the feedback dimension.

[0249] In some possible implementation manners, the transceiver is further configured to: receive third indication information, the third indication information being used to indicate that, in a case that feedback dimensions corresponding to different time instants are different, the second time-frequency point, the first transmission antenna port and the first reception antenna port are the second time-frequency point, the first transmission antenna port and the first reception antenna port determined in an equal interval mode or a variable interval mode; when the second time-frequency point, the first transmission antenna port and the first reception antenna port are determined in the variable interval mode, the third indication information includes sampling intervals and sampling starting points corresponding to different time instants.

[0250] In some possible implementation manners, the processing unit includes a processor.

[0251] In some possible implementation manners, the transceiver includes a transceiver.

[0252] In a ninth aspect, a communication apparatus is provided, and the apparatus includes a processor configured to execute computer instructions to cause the apparatus to perform the method in the first aspect to the fourth aspect and any possible implementation manner thereof.

[0253] In some possible implementation manners, the apparatus further includes a memory.

[0254] In some possible implementation manners, the apparatus further includes a communication interface coupled to the processor, and the communication interface is configured to input and / or output information.

[0255] In a tenth aspect, a computer program product is provided. The computer program product, when the computer program in the computer program product is executed by a communication device, implements the method in the first aspect to the fourth aspect and any possible implementation manner thereof.

[0256] In an eleventh aspect, a computer-readable storage medium is provided. The computer-readable storage medium stores a computer program or instructions. When the computer program or instructions is executed by a communication device, the method in the first aspect to the fourth aspect and any possible implementation manner thereof is implemented.

[0257] In a twelfth aspect, a chip (or chip system) is provided. The chip includes at least one processor configured to execute a computer program, so that a device in which the chip is installed performs the method in the first aspect to the fourth aspect and any possible implementation manner thereof.

[0258] The chip can include an output circuit or interface for sending information or data, and an input circuit or interface for receiving information or data.

[0259] In a thirteenth aspect, a communication system is provided. The communication system includes a network device and a terminal device. The terminal device is configured to perform the method in the first aspect and any possible implementation manner thereof. The network device is configured to perform the method in the second aspect and any possible implementation manner thereof. Alternatively, the terminal device is configured to perform the method in the third aspect and any possible implementation manner thereof. The network device is configured to perform the method in the fourth aspect and any possible implementation manner thereof.

[0260] In a fourteenth aspect, a communication system is provided. The communication system includes a network device and a terminal device. The network device is configured to perform the method in the first aspect and any possible implementation manner thereof. The terminal device is configured to perform the method in the second aspect and any possible implementation manner thereof. Alternatively, the network device is configured to perform the method in the third aspect and any possible implementation manner thereof. The terminal device is configured to perform the method in the fourth aspect and any possible implementation manner thereof.

[0261] In a fifteenth aspect, a communication system is provided. The communication system includes a first network device and a second network device. The first network device is configured to perform the method in the first aspect and any possible implementation manner thereof. The second network device is configured to perform the method in the second aspect and any possible implementation manner thereof. Alternatively, the first network device is configured to perform the method in the third aspect and any possible implementation manner thereof. The second network device is configured to perform the method in the fourth aspect and any possible implementation manner thereof.

[0262] In a sixteenth aspect, a communication system is provided, comprising: a first terminal device and a second terminal device, wherein the first terminal device is configured to execute the method of the first aspect and any possible implementation thereof, and the second terminal device is configured to execute the method of the second aspect and any possible implementation thereof; or, the first terminal device is configured to execute the method of the third aspect and any possible implementation thereof, and the second terminal device is configured to execute the method of the fourth aspect and any possible implementation thereof. Attached Figure Description

[0263] Figure 1 is a schematic diagram of a possible application framework in a communication system.

[0264] Figure 2 is a schematic diagram of a possible application framework in a communication system.

[0265] Figure 3 is a schematic diagram of a communication system applicable to the communication method of this application embodiment.

[0266] Figure 4 is a schematic diagram of a communication system applicable to the communication method of this application embodiment.

[0267] Figure 5 is a schematic diagram of the neuron structure.

[0268] Figure 6 is a schematic diagram of the relationship between the encoder and the decoder.

[0269] Figure 7 is a schematic diagram of the projection of the clustered delay line (CDL)-C channel.

[0270] Figure 8 is a schematic diagram of a communication method applicable to an embodiment of this application.

[0271] Figure 9 is a schematic diagram of a communication method 1000 provided in an embodiment of this application.

[0272] Figure 10 is a schematic diagram of a pilot pattern applicable to an embodiment of this application.

[0273] Figure 11 is a schematic diagram of a communication method 300 provided in an embodiment of this application.

[0274] Figure 12 is a schematic diagram of another pilot pattern applicable to embodiments of this application.

[0275] Figure 13 is a schematic diagram of a communication method 1100 applicable to an embodiment of this application.

[0276] Figure 14 is a schematic diagram of another communication method 1200 applicable to embodiments of this application.

[0277] Figure 15 is a schematic diagram of a communication device 2000 provided in an embodiment of this application.

[0278] FIG. 16 is a schematic diagram of another communication apparatus 3000 provided in an embodiment of the present application. DETAILED DESCRIPTION

[0279] The technical solutions in the present application will be described below with reference to the drawings.

[0280] The technical solutions provided in the present application can be applied to various communication systems, such as a 5th generation (5G) or new radio (NR) system, a long term evolution (LTE) system, an LTE frequency division duplex (FDD) system, an LTE time division duplex (TDD) system, a wireless local area network (WLAN) system, a satellite communication system, a future communication system, or a converged system of multiple systems, etc. The technical solutions provided in the present application can also be applied to device to device (D2D) communication, vehicle-to-everything (V2X) communication, machine to machine (M2M) communication, machine type communication (MTC), and an internet of things (IoT) communication system or other communication systems.

[0281] A device in a communication system can send a signal to another device or receive a signal from another device. The signal can include information, signaling, or data, etc. The device can also be replaced by an entity, a network entity, a communication device, a mobile device, a network element, a communication module, a node, a communication node, a communication apparatus, etc. The present disclosure describes the device as an example. For example, the communication system can include at least one terminal device and at least one network device. The network device can send a downlink signal to the terminal device, and / or the terminal device can send an uplink signal to the network device.

[0282] In an embodiment of the present application, the terminal device can also be referred to as a user equipment (UE), an access terminal, a subscriber unit, a subscriber station, a mobile station, a mobile, a remote station, a remote terminal, a mobile device, a user terminal, a terminal, a wireless communication device, a user agent, or a user apparatus.

[0283] The terminal device can be a device providing voice / data, for example, a handheld device with wireless connection function, a vehicle-mounted device, etc. At present, some examples of terminals are: mobile phone, tablet computer, notebook computer, palm computer, mobile internet device (MID), wearable device, virtual reality (VR) device, augmented reality (AR) device, wireless terminal in industrial control, wireless terminal in self driving, wireless terminal in remote medical surgery, wireless terminal in smart grid, wireless terminal in transportation safety, wireless terminal in smart city, wireless terminal in smart home, cellular phone, cordless phone, session initiation protocol (SIP) phone, wireless local loop (WLL) station, personal digital assistant (PDA), handheld device with wireless communication function, computing device or other processing device connected to a wireless modem, wearable device, terminal device in a 5G network, or terminal device in a future evolved public land mobile network (PLMN), etc. The embodiments of the present application are not limited thereto.

[0284] By way of example and not limitation, in the embodiments of the present application, the terminal device can also be a wearable device. The wearable device can also be referred to as a wearable smart device, which is a general term for devices that are designed and developed by applying wearable technology to daily wear, such as glasses, gloves, watches, clothing, and shoes. The wearable device is a portable device that is directly worn on the body or integrated into the user's clothes or accessories. The wearable device is not only a hardware device, but also a device that realizes powerful functions through software support and data interaction and cloud interaction. The general wearable smart device includes devices with full functions, large size, and the ability to realize complete or partial functions without relying on a smart phone, such as smart watches or smart glasses, and devices that focus on a certain application function and need to be used in cooperation with other devices, such as smart phones, such as various smart wristbands and smart jewelry for monitoring vital signs.

[0285] In the embodiments of the present application, the apparatus for implementing the function of the terminal device can be a terminal device, or can be an apparatus capable of supporting the terminal device to implement the function, for example, a chip system, which can be installed in the terminal device or used in matching with the terminal device. In the embodiments of the present application, the chip system can be composed of a chip, or can include the chip and other discrete devices. In the embodiments of the present application, only the apparatus for implementing the function of the terminal device is taken as an example for description, and the scheme of the embodiments of the present application is not limited in this way.

[0286] The network device in the embodiments of the present application can include a device for communicating with a terminal device. For example, the network device can include an access network device or a radio access network device, such as a base station (BS) or a network (NW). The radio access network device in the embodiments of the present application can refer to a radio access network (RAN) node (or device) that accesses a terminal device to a wireless network. The base station can broadly cover various names in the following or be replaced by the following names, such as: Node B (NodeB), evolved Node B (eNB), next generation Node B (gNB), relay station, access point, transmitting and receiving point or transmit / receive point (TRP), transmitting point (TP), primary station, secondary station, motor slide retainer (MSR) node, home base station, network controller, access node, wireless node, access point (AP), transmission node, transceiver node, baseband unit (BBU), remote radio unit (RRU), active antenna unit (AAU), remote radio head (RRH), central unit (CU), distributed unit (DU), radio unit (RU), positioning node, etc. The base station can be a macro base station, a micro base station, a relay node, a donor node or the like, or a combination thereof. The base station can also refer to a communication module, modem or chip used in the above-mentioned devices or apparatuses. The base station can also be a mobile switching center and a device that performs the function of a base station in D2D, V2X, M2M communication, a device that performs the function of a base station in future communication systems, etc. The base station can support networks of the same or different access technologies. Alternatively, the RAN node can also be a server, a wearable device, a vehicle or a vehicle-mounted device, etc. For example, the access network device in the vehicle to everything (V2X) technology can be a road side unit (RSU). The embodiments of the present application do not limit the specific technology and specific device form of the network device.

[0287] A base station can be fixed, or mobile. For example, a helicopter or unmanned aerial vehicle can be configured to function as a mobile base station, one or more cells can move according to the location of the mobile base station. In other examples, a helicopter or unmanned aerial vehicle can be configured to function as a device that communicates with another base station.

[0288] In some deployments, the network device mentioned in the embodiments of the present application can be a device including a CU, or a DU, or a device including a CU and a DU, or a control plane CU node (central unit-control plane (CU-CP)) and a user plane CU node (central unit-user plane (CU-UP)) and a DU node. For example, the network device can include a gNB-CU-CP, a gNB-CU-UP and a gNB-DU.

[0289] In some deployments, a plurality of RAN nodes cooperate to assist a terminal to implement wireless access, and different RAN nodes respectively implement part of the functions of a base station. For example, the RAN node can be a CU, a DU, a CU-CP, a CU-UP, or an RU, etc. The CU and the DU can be separately arranged, or can also be included in the same network element, for example, in a BBU. The RU can be included in a radio frequency device or a radio frequency unit, for example, included in an RRU, an AAU or an RRH.

[0290] The RAN node can support one or more types of fronthaul interfaces, different fronthaul interfaces respectively corresponding to DUs and RUs having different functions. If the fronthaul interface between the DU and the RU is a common public radio interface (CPRI), the DU is configured to implement one or more of baseband functions, and the RU is configured to implement one or more of radio frequency functions. If the fronthaul interface between the DU and the RU is another interface, which, relative to the CPRI, moves one or more of partial baseband functions of the downlink and / or uplink, such as, for the downlink, one or more of precoding, digital beamforming (BF), or inverse fast Fourier transform (IFFT) / add cyclic prefix (CP), from the DU to the RU for implementation, and for the uplink, one or more of digital beamforming (BF), or fast Fourier transform (FFT) / remove cyclic prefix (CP), from the DU to the RU for implementation. In a possible implementation, the interface can be an enhanced common public radio interface (eCPRI). Under the eCPRI architecture, the splitting manner between the DU and the RU is different, corresponding to different categories (Cat) of eCPRI, such as eCPRI Cat A, B, C, D, E, and F.

[0291] Taking eCPRI Cat A as an example, for downlink transmission, with layer mapping as the cut, the DU is configured to implement layer mapping and one or more functions (i.e., one or more of encoding, rate matching, scrambling, modulation, layer mapping) before layer mapping, and other functions (e.g., one or more of RE mapping, digital beamforming (BF), or inverse fast Fourier transform (IFFT) / addition of cyclic prefix (CP)) after layer mapping are implemented in the RU. For uplink transmission, with de-RE mapping as the cut, the DU is configured to implement de-mapping and one or more functions (i.e., one or more of decoding, de-rate matching, de-scrambling, de-modulation, inverse discrete Fourier transform (IDFT), channel equalization, de-RE mapping) before de-mapping, and other functions (e.g., one or more of digital BF or fast Fourier transform (FFT) / CP removal) after de-mapping are implemented in the RU. It can be understood that the function description of the DU and the RU corresponding to various types of eCPRI can refer to the eCPRI protocol, and will not be described here.

[0292] In a possible design, the processing unit in the BBU for implementing baseband functions is referred to as a base band high (BBH) unit, and the processing unit in the RRU / AAU / RRH for implementing baseband functions is referred to as a base band low (BBL) unit.

[0293] In different systems, the CU (or CU-CP and CU-UP), DU or RU can also have different names, but those skilled in the art can understand their meanings. For example, in an open RAN (ORAN) system, the CU can also be referred to as an O-CU (open CU), the DU can also be referred to as an O-DU, the CU-CP can also be referred to as an O-CU-CP, the CU-UP can also be referred to as an O-CU-UP, and the RU can also be referred to as an O-RU. Any of the CU (or CU-CP, CU-UP), DU and RU in this application can be implemented by a software module, a hardware module, or a combination of a software module and a hardware module.

[0294] In the embodiments of the present application, the apparatus for implementing the function of the network device can be a network device, or an apparatus capable of supporting the network device to implement the function, such as a chip system, a hardware circuit, a software module, or a hardware circuit plus a software module. The apparatus can be installed in the network device or used in combination with the network device. In the embodiments of the present application, only the apparatus for implementing the function of the network device is taken as an example for description, and the scheme of the embodiments of the present application is not limited in this way.

[0295] The network device and / or the terminal device can be deployed on land, including indoors or outdoors, handheld or vehicle-mounted; can also be deployed on water; and can also be deployed on airplanes, balloons and satellites in the air. The scenarios in which the network device and the terminal device are located are not limited in the embodiments of the present application. In addition, the terminal device and the network device can be hardware devices, or software functions running on special hardware, software functions running on general hardware, such as virtualized functions instantiated on a platform (for example, a cloud platform), or entities including special or general hardware devices and software functions. The specific forms of the terminal device and the network device are not limited in the present application.

[0296] In a wireless communication network, for example, in a mobile communication network, the services supported by the network are increasingly diverse, and therefore the needs to be met are increasingly diverse. For example, the network needs to be able to support ultra-high rates, ultra-low latencies, and / or ultra-large connections. This feature makes network planning, network configuration, and / or resource scheduling increasingly complex. In addition, as the functions of the network become increasingly powerful, for example, supporting increasingly high frequency spectrums, supporting high-order multiple input multiple output (MIMO) technology, supporting beamforming, and / or supporting new technologies such as beam management, network energy saving has become a hot research topic. These new needs, new scenarios and new features bring unprecedented challenges to network planning, operation and efficient operation. In order to meet this challenge, artificial intelligence technology can be introduced into the wireless communication network, thereby realizing network intelligentization.

[0297] In order to support artificial intelligence (AI) technology in the wireless network, an AI node can also be introduced into the network.

[0298] Optionally, the AI node can be deployed in one or more of the following positions in the communication system: an access network device, a terminal device, or a core network device, etc., or the AI node can also be deployed separately, for example, deployed in a position other than any of the above devices, such as a host or a cloud server of an over the top (OTT) system. The AI node can communicate with other devices in the communication system, which can be one or more of the following: a wireless access network device, a terminal device, or a network element of a core network, etc.

[0299] It can be understood that the present application does not limit the number of AI nodes. For example, when there are multiple AI nodes, the multiple AI nodes can be divided based on functions, such as different AI nodes being responsible for different functions.

[0300] It can also be understood that the AI node can be a separate device, can be integrated into the same device to implement different functions, or can be a network element in a hardware device, or a software function running on a dedicated hardware, or a virtualized function instantiated on a platform (such as a cloud platform), and the present application does not limit the specific form of the AI node.

[0301] The AI node can be an AI network element or an AI module.

[0302] FIG. 1 is a schematic diagram of a possible application framework in a communication system. As shown in FIG. 1, the network elements in the communication system are connected through interfaces (such as next generation (NG) interfaces, Xn interfaces), or air interfaces. One or more AI modules (only one is shown in FIG. 1 for clarity) are provided in one or more of the following network element nodes: a core network device, an access network node or device (RAN node or device), a terminal, or one or more devices in operation administration and maintenance (OAM). The access network node can be a separate RAN node, or can include multiple RAN nodes, for example, including a CU and a DU. The CU and / or DU can also be provided with one or more AI modules. Optionally, the CU can also be split into a CU-CP and a CU-UP. One or more AI models are provided in the CU-CP and / or the CU-UP.

[0303] The AI module is used to implement a corresponding AI function. The AI modules deployed in different network elements can be the same or different. The AI module can implement different functions according to different parameter configurations of the model of the AI module. The model of the AI module can be configured based on one or more of the following parameters: a structure parameter (for example, at least one of a number of neural network layers, a width of a neural network, a connection relationship between layers, a weight of a neuron, an activation function of a neuron, or a bias in the activation function), an input parameter (for example, a type of input parameter and / or a dimension of the input parameter), or an output parameter (for example, a type of output parameter and / or a dimension of the output parameter). The bias in the activation function can also be referred to as a bias of the neural network.

[0304] One AI module can have one or more models. One model can infer an output including one parameter or multiple parameters. The learning process, the training process, or the inference process of different models can be deployed in different nodes or devices, or can be deployed in the same node or device.

[0305] FIG. 2 is a schematic diagram of a possible application framework in a communication system. As shown in FIG. 2, the communication system includes a RAN intelligent controller (RIC). For example, the RIC can be the AI module shown in FIG. 1, used to implement AI-related functions. The RIC includes a near-real time RIC (near-RT RIC) and a non-real time RIC (Non-RT RIC). The non-real time RIC mainly processes non-real-time information, such as data that is not sensitive to latency, which can be on the order of seconds. The real-time RIC mainly processes near-real-time information, such as data that is relatively sensitive to latency, which is on the order of tens of milliseconds.

[0306] The near-real-time RIC is used for model training and inference. For example, for training an AI model, inference is performed using the AI model. The near-real-time RIC can obtain network-side and / or terminal-side information from RAN nodes (such as CUs, CU-CPs, CU-UPs, DUs, and / or RUs) and / or terminals. This information can be used as training data or inference data. Optionally, the near-real-time RIC can submit inference results to RAN nodes and / or terminals. Optionally, the inference results can be exchanged between CUs and DUs, and / or between DUs and RUs. For example, the near-real-time RIC submits the inference results to the DU, and the DU sends the inference results to the RU.

[0307] The non-real-time RIC is also used for model training and inference. For example, the non-real-time RIC is used for training an AI model, and inference is performed using the model. The non-real-time RIC can obtain network-side and / or terminal-side information from a RAN node (e.g., a CU, a CU-CP, a CU-UP, a DU, and / or a RU) and / or a terminal. The information can be used as training data or inference data, and the inference result can be delivered to the RAN node and / or the terminal. Alternatively, the inference result can be exchanged between a CU and a DU, and / or between a DU and a RU, for example, the non-real-time RIC delivers the inference result to the DU, and the inference result is further delivered to the RU by the DU.

[0308] The near-real-time RIC and the non-real-time RIC can be respectively configured as a network element alone. Alternatively, the near-real-time RIC and the non-real-time RIC can be part of other devices, for example, the near-real-time RIC is configured in a RAN node (e.g., a CU, a DU), and the non-real-time RIC is configured in an OAM, a cloud server, a core network device, or other network devices.

[0309] FIG. 3 is a schematic diagram of a communication system suitable for the communication method according to the embodiments of the present application. As shown in FIG. 3, the communication system 100 can include at least one network device, for example, the network device 110 shown in FIG. 3, and can include at least one terminal device, for example, the terminal device 120 and the terminal device 130 shown in FIG. 3. The network device 110 and the terminal devices (e.g., the terminal device 120 and the terminal device 130) can communicate with each other through wireless links. The communication devices in the communication system, for example, the network device 110 and the terminal device 120, can communicate with each other through multi-antenna technology.

[0310] FIG. 4 is a schematic diagram of a communication system suitable for the communication method according to the embodiments of the present application. Compared with the communication system 100 shown in FIG. 3, the communication system 200 shown in FIG. 4 further includes an AI network element 140. The AI network element 140 is used to perform AI-related operations, for example, constructing a training data set or training an AI model.

[0311] In a possible implementation, the network device 110 can send data related to the training of the AI model to the AI network element 140, the AI network element 140 constructs a training data set and trains the AI model. For example, the data related to the training of the AI model can include data reported by the terminal device. The AI network element 140 can send the result of the AI model related operation to the network device 110 and forward it to the terminal device through the network device 110. For example, the result of the AI model related operation can include at least one of the following: a trained AI model, an evaluation result or a test result of the model, and the like. For example, part of the trained AI model can be deployed on the network device 110, and the other part can be deployed on the terminal device. Alternatively, the trained AI model can be deployed on the network device 110. Alternatively, the trained AI model can be deployed on the terminal device.

[0312] It should be understood that FIG. 4 is only used as an example to illustrate that the AI network element 140 is directly connected to the network device 110, and in other scenarios, the AI network element 140 can also be connected to the terminal device. Alternatively, the AI network element 140 can be connected to both the network device 110 and the terminal device. Alternatively, the AI network element 140 can also be connected to the network device 110 through a third-party network element. The connection relationship between the AI network element and other network elements is not limited in the embodiments of the present application.

[0313] The AI network element 140 can also be set as a module in the network device and / or the terminal device, for example, in the network device 110 or the terminal device shown in FIG. 3.

[0314] It should be noted that FIGS. 3 and 4 are only simplified schematic diagrams for understanding, for example, the communication system can also include other devices, such as wireless relay devices and / or wireless backhaul devices, which are not shown in FIGS. 3 and 4. In actual application, the communication system can include multiple network devices and multiple terminal devices. The number of network devices and terminal devices included in the communication system is not limited in the embodiments of the present application.

[0315] In order to facilitate understanding of the scheme of the embodiments of the present application, the terms that can be involved in the embodiments of the present application are explained as follows.

[0316] (1) Artificial intelligence: It is to make the machine have learning ability and can accumulate experience to solve the problems that can be solved by human experience, such as natural language understanding, image recognition and chess playing. Artificial intelligence can be understood as the intelligence shown by the machine made by human. Artificial intelligence usually refers to the technology of presenting human intelligence through computer program. The goal of artificial intelligence includes understanding intelligence by constructing symbolic reasoning or reasoning computer program.

[0317] (2) Machine Learning (ML): is a way of implementing artificial intelligence. Machine learning is a method that can give a machine the ability to learn and complete functions that cannot be completed by direct programming. In a practical sense, machine learning is a method of training a model by using data and then using the model for prediction. There are many methods of machine learning, such as neural networks (NN), decision trees, support vector machines, etc. Machine learning theory is mainly about designing and analyzing algorithms that allow computers to automatically learn. Machine learning algorithms are a class of algorithms that automatically analyze rules from data and use the rules to predict unknown data.

[0318] (3) Neural Network: Neural network is a specific embodiment of machine learning method. Neural network is a mathematical model that simulates the behavior characteristics of animal neural network for information processing. As shown in FIG. 5, neural network is a network that can be composed of three types of calculation layers, input layer, hidden layer and output layer. Each layer has one or more logical judgment units, which are called neurons. Common neural network structures include feedforward neural network (FNN), convolutional neural network (CNN) and recurrent neural network (RNN), etc., which are all based on neurons. Among them, each neuron can perform weighted summation operation on its input value, and the result of the weighted summation operation is output through a nonlinear function. The weights of the neurons in the neural network and the nonlinear function can be referred to as the parameters of the neural network, the connection relationship between the neurons in the neural network can be referred to as the structure of the neural network, and all the parameters of the neurons in the neural network constitute the parameters of the neural network.

[0319] (4) Deep Neural Network: Neural network with multiple hidden layers.

[0320] (5) Deep Learning: Machine learning using deep neural networks.

[0321] (6) AI Model: is an algorithm or computer program that can realize AI function. The AI model represents the mapping relationship between the input and output of the model, or in other words, the AI model is a function model that maps a certain dimension of input to a certain dimension of output. The parameters of the function model can be obtained by machine learning training. For example, f(x) = ax 2+b is a quadratic function model, which can be regarded as an AI model, a and b are parameters of the AI model, and a and b can be obtained by machine learning training. Exemplarily, the AI model mentioned in the embodiments below is not limited to a neural network, a linear regression model, a decision tree model, a support vector machine (SVM), a Bayesian network, a Q learning model, or other machine learning (ML) models.

[0322] The implementation of the AI model can be hardware circuit, software, or a combination of software and hardware, without limitation. Non-limiting examples of software include program code, programs, subprograms, instructions, instruction sets, codes, code segments, software modules, applications, or software applications, etc.

[0323] (7) Two-side model:

[0324] The two-side model can also be referred to as a bilateral model, a collaborative model, a dual model, or a two-side model, etc. The two-side model refers to a model composed of multiple sub-models. The multiple sub-models constituting the model need to match each other. The multiple sub-models can be deployed in different nodes.

[0325] The embodiments of the present application relate to an encoder and a decoder for calculating channel information. The encoder and the decoder are matched for use, and it can be understood that the encoder and the decoder are matched AI models. One encoder can include one or more AI models, and the decoder matched with the encoder also includes one or more AI models. The AI models included in the matched encoder and decoder are the same in number and one-to-one correspondence. Among them, the encoder can also include a quantization module, which can be used for quantization processing of the output of the AI model in the encoder. The decoder can include a dequantization module, which can be used for dequantization processing of the feedback information of the received channel information to obtain the input of the AI model in the decoder. Dequantization can also be replaced by dequantization.

[0326] In one possible design, a pair of encoder and decoder can be used for two parts of the same auto-encoder (AE). The encoder and the decoder can be deployed at different nodes of the AE model, which is a typical bilateral model. The encoder and the decoder of the AE model are usually jointly trained. An auto-encoder is a kind of unsupervised learning neural network, which is characterized by taking input data as label data, and thus can also be understood as a self-supervised learning neural network. An auto-encoder can be used for data compression and recovery. For example, the encoder of the auto-encoder can compress (encode) data A to obtain data B, and the decoder of the auto-encoder can decompress (decode) data B to recover data A. Alternatively, the decoder can be understood as the inverse operation of the encoder. For a description of the encoder and the decoder, refer to FIG. 6.

[0327] FIG. 6 is a schematic diagram of a relationship 600 between an encoder and a decoder. As shown in FIG. 6, the encoder processes input V to obtain a processed result z, and the decoder can decode the output z of the encoder to obtain the expected output V’.

[0328] The AI model in the embodiments of this application can include an encoder deployed at a terminal device and a decoder deployed at a network device, or an encoder deployed at a terminal device and a decoder deployed at another terminal device, or an encoder deployed at a network device and a decoder deployed at another network device.

[0329] (8) Channel information:

[0330] In a communication system, a network device determines one or more of the following configurations of a terminal device based on channel information: a resource of a downlink data channel, a modulation and coding scheme (MCS), and precoding. It can be understood that the channel information can also be referred to as channel state information (CSI) or channel environment information, which is information that can reflect channel characteristics and channel quality.

[0331] CSI measurement refers to solving channel information by a receiving end based on a reference signal sent by a sending end, i.e., estimating channel information by using a channel estimation method. For example, the reference signal can include a pilot signal. The reference signal involved in this application includes but is not limited to:

[0332] Pilot reference signals (e.g., channel state information-reference signals (CSI-RSs) and / or sounding reference signals (SRSs)), demodulation reference signals (DMRSs), tracking reference signals (TRSs), phase tracking reference signals (PT-RSs), positioning reference signals (PRSs), or sensing reference signals (SeRSs), etc. Optionally, the pilot reference signals can be referred to as pilots, or pilot signals, where the pilot signals are used for channel measurement. The reference signals in this application can also be reference signals other than the above-mentioned reference signals that can be carried in orthogonal frequency division multiplexing (OFDM) symbols, which are not described here.

[0333] Taking an FDD communication scenario as an example, since the uplink and downlink channels do not have reciprocity or cannot guarantee the reciprocity of the uplink and downlink channels, the network device needs to obtain the downlink CSI through the uplink feedback of the terminal device. The network device will usually send a downlink reference signal to the terminal device, and the terminal device receives the downlink reference signal. Since the terminal device knows the transmission information of the downlink reference signal, the terminal device can perform channel measurement on the received downlink reference signal, estimate (measure) the downlink channel experienced by the downlink reference signal, and generate the downlink CSI based on the measurement of the downlink channel matrix.

[0334] (9) Radio Frequency Map (RF map):

[0335] The radio map can reflect the parameter values of each location point in the wireless network, such as signal strength, signal quality, channel condition, and the like. The radio map helps to understand the propagation characteristics of wireless signals in different environments. Common radio maps include channel gain maps, received signal strength maps, power spectral density maps, and the like. Radio maps have been widely used in wireless communication and networking, including network planning, interference control, power control, resource allocation, handover management, multi-hop routing, dynamic spectrum access, and cognitive radio network tasks.

[0336] Radio maps can be created based on field measurement data or generated through simulation and prediction models.

[0337] In positioning technology, radio maps can assist in determining the direction of arrival (DoA) or direction of departure (DoD) of signals, estimating the location of signal sources by comparing actual received signals with data on the map.

[0338] (10) Random phase:

[0339] In signal processing, random phase generally refers to the phase of a signal that changes randomly, which may be due to multipath effects, changes in signal propagation environment, or uncertainty of signal sources. Random phase affects the time-frequency characteristics of the signal, thereby affecting the propagation and reception of the signal.

[0340] In wireless communication, random phase can cause signal fading and multipath interference, which needs to be compensated through channel estimation, equalization, etc.

[0341] In the construction and use of radio maps, random phase is a factor that needs to be considered. For example, in a multipath environment, the phase of the signal will change randomly due to different propagation paths, which will affect the accuracy of the radio map. Therefore, when creating a radio map, statistical methods may be needed to handle the impact of random phase, or machine learning techniques can be used to predict and compensate for randomness.

[0342] In practical applications, the input of the radio map is generally the information of the user and the base station (such as location coordinates, environmental information, etc.), and the output can be the multipath element (MPC) of the position connected to the user and the base station. The MPC of the user's location can include at least one of DoD, DoA, power, or delay.

[0343] (11) Time-frequency domain conversion module:

[0344] The time-frequency domain conversion module can convert the MPC to channel information, such as CSI. The time-frequency domain conversion module can be implemented through mathematical models, simulation models, AI models, etc.

[0345] As shown in FIG. 7, FIG. 7 is a schematic diagram of a projection of a clustered delay line (CDL)-C channel. The measurement of the channel can be completed by using a projection operator. For example, a high order singular value decomposition (HOSVD) can be performed on the channel to analyze the sparsity of each dimension (frequency domain, time domain, antenna, etc.). Or a singular value decomposition (SVD) can be performed on the second order correlation matrix of the channel to obtain the sparsity of multiple dimensions jointly. The sparsity can be used to realize the channel measurement.

[0346] However, when the channel dimension is too large, the overhead of calculating the projection operator is large.

[0347] Therefore, the present application provides a communication method, which is beneficial to reduce the overhead of channel estimation.

[0348] Before introducing the scheme of the present application, the following points are explained.

[0349] (1) In the present application, "indication" can include direct indication, indirect indication, explicit indication, and implicit indication. When it is described that certain indication information is used to indicate A, it can be understood that the indication information carries A, directly indicates A, or indirectly indicates A.

[0350] In the present application, the information indicated by the indication information is referred to as to-be-indicated information. In the specific implementation process, there are many ways to indicate the to-be-indicated information, for example but not limited to, the to-be-indicated information can be directly indicated, such as the to-be-indicated information itself or an index of the to-be-indicated information. The to-be-indicated information can also be indirectly indicated by indicating other information, where the other information and the to-be-indicated information have an association relationship. The to-be-indicated information can also be indicated only by a part of the to-be-indicated information, and the other part of the to-be-indicated information is known or agreed in advance. For example, the indication of a specific information can also be realized by means of the arrangement order of each information agreed in advance (for example, a protocol), thereby reducing the indication overhead to a certain extent. In addition, the to-be-indicated information can be sent as a whole, or can be sent separately into multiple sub-information, and the sending period and / or sending time of these sub-information can be the same or different.

[0351] (2) In the present application, "sending" and "receiving" represent the direction of signal transmission, and "transmitting" can include at least one of sending and / or receiving. For example, "sending information to XX" can be understood as that the destination of the information is XX, which can include direct sending through the air interface, or indirect sending through the air interface by other units or modules. "Receiving information from YY" can be understood as that the source of the information is YY, which can include direct receiving from YY through the air interface, or indirect receiving from YY through the air interface by other units or modules. "Sending" can also be understood as "output" of a chip interface, and "receiving" can also be understood as "input" of a chip interface. In other words, sending and receiving can be performed between devices, such as between a network device and a terminal device, or can be performed within a device, such as between components, modules, chips, software modules or hardware modules within a device through a bus, wire or interface.

[0352] (3) In various embodiments of the present application, the terms and / or descriptions of different embodiments are consistent and can be referred to each other if there is no special description and logical conflict, and the technical features in different embodiments can be combined to form new embodiments according to their inherent logical relationship.

[0353] (4) In the present application, "first", "second", "#1", "#2", etc. are only for convenience of description and are used to distinguish objects, and are not used to limit the scope of the embodiments of the present application. They are not used to describe the order or sequence of features. It should be understood that the objects thus described can be interchanged under appropriate circumstances, so as to be able to describe schemes other than the embodiments of the present application.

[0354] (5) In the present application, "#()" represents the number.

[0355] (6) In the present application, "predefined" can mean standard protocol predefined, or can also mean pre-agreed or pre-negotiated between devices.

[0356] (7) In the present application, the words "exemplary", "for example", etc. are used to represent examples, illustrations or descriptions. Any embodiment or design scheme described as "example" in the present application should not be interpreted as more preferred or more advantageous than other embodiments or design schemes. Rather, the word "example" is intended to present the concept in a specific way. In the embodiments of the present application, "of", "corresponding" and "corresponding" can be used interchangeably at times. It should be pointed out that when the distinction is not emphasized, the meanings expressed are consistent.

[0357] (8) In this document, "at least one" or "at least one item" means one or more. "More" means two or more. "And / or" describes the relationship between related objects, indicating that there can be three relationships. For example, A and / or B can mean: A exists alone, A and B exist simultaneously, or B exists alone, where A and B can be singular or plural. In the textual description of this application, the character " / " generally indicates that the related objects before and after are in an "or" relationship; in the formula of this application, the character " / " indicates that the related objects before and after are in a "division" relationship. "Including at least one of A, B and C" can mean: including A; including B; including C; including A and B; including A and C; including B and C; including A, B and C.

[0358] (9) The arrows or boxes indicated by dashed lines in the schematic diagrams in the accompanying drawings of this application indicate optional steps or optional modules.

[0359] The communication method provided by the embodiments of this application will be described in detail below with reference to the accompanying drawings. The embodiments provided by this application can be applied to the communication systems shown in Figure 3 or Figure 4 above, and are not limited thereto.

[0360] For ease of understanding, the following describes the communication method provided in the embodiments of this application using the interaction between the first device and the second device as an example.

[0361] The first device can refer to a device on the terminal device side or the network device side (e.g., a terminal device or a network device), or a component within the device (e.g., a communication module, processor, circuit, chip, or chip system), or a logic module or software capable of implementing all or part of the communication device's functions. The terminal device side can include at least one of a terminal device or an AI entity on the terminal device side. The AI ​​entity on the terminal device side can be the terminal device itself or an AI entity serving the terminal device, such as a server, such as an over-the-top (OTT) server or a cloud server. The network device side can include at least one of a network device or an AI entity on the network device side. The AI ​​entity on the network device side can be the network device itself or an AI entity serving the network device, such as a radio access network (RAN) intelligent controller (RIC), operation administration and maintenance (OAM), or a server, such as an OTT server or a cloud server. Communication between servers can be achieved through a communication link between the terminal device and the network device, through forwarding via other communication devices outside the server, or through a wired link.

[0362] The second device can refer to a device (e.g., a terminal device or a network device) on the terminal device side or the network device side, can be a component (e.g., a communication module, a processor, a circuit, a chip, or a chip system, etc.) in the device, or can be a logic module or software capable of implementing all or part of the communication device functions. The terminal device side can include at least one of a terminal device or an AI entity on the terminal device side. The AI entity on the terminal device side can be the terminal device itself or an AI entity serving the terminal device, for example, a server such as an over the top (OTT) server or a cloud server, etc. The network device side can include at least one of a network device or an AI entity on the network device side. The AI entity on the network device side can be the network device itself or an AI entity serving the network device, for example, a radio access network (RAN) intelligent controller (RIC), an operation administration and maintenance (OAM), or a server such as an OTT server or a cloud server, etc. The communication between servers can be realized through a communication link between the terminal device and the network device, or through other communication devices outside the servers, or through a wired link.

[0363] It should be further noted that the first device in the following embodiments can be different from the second device, for example, the first device is a network device and the second device is a terminal device, or the first device is a terminal device and the second device is a network device, or the first device is a first network device and the second device is a second network device, or the first device is a first terminal device and the second device is a second terminal device. The embodiments of the present application do not limit this.

[0364] The result obtained by performing channel estimation or channel feedback in the following embodiments can be obtained by the first device or the second device by measuring the pilot signal.

[0365] As shown in FIG. 8, FIG. 8 is a schematic diagram of a communication method suitable for the embodiments of the present application.

[0366] The parameter quantity N to be acquired can be determined through the MPC, the feedback dimension and / or the pilot pattern can be determined through the N, the channel measurement and feedback can be performed according to the determined pilot pattern and / or feedback dimension, the phase part of the multipath can be determined according to the result of the channel measurement, and the channel measurement can be performed according to the phase part of the multipath and the MPC.

[0367] The communication method 1000 provided by the embodiment of the present application is described in detail below in combination with FIG. 9 and FIG. 10. The method 1000 can be applied to FIG. 8.

[0368] As shown in FIG. 9, FIG. 9 is a schematic diagram of a communication method 1000 provided by the embodiment of the present application. The method 1000 is applied to a first device, and the method 1000 can include the following steps.

[0369] S1010, determining a multipath element MPC of a location where the first device is located.

[0370] Specifically, the first device can determine the multipath element MPC of the location where the first device is located, and the MPC can include at least one of DoA, DoD, power, or delay.

[0371] For example, the first device can determine the MPC according to a radio map, or can determine the MPC according to other manners (for example, the MPC can be obtained according to ray tracing), and the embodiment of the present application does not limit this.

[0372] S1020, determining a first pilot pattern according to the MPC, the first pilot pattern being used for indicating a first time-frequency point, and the first time-frequency point being used for transmitting a pilot signal.

[0373] Specifically, after the first device determines the MPC of the location where the first device is located, the first device can determine the first pilot pattern according to the MPC. The first time-frequency point indicated by the first pilot pattern can be used for transmitting a pilot signal. The pilot signal can be used for channel measurement.

[0374] For example, after the first device determines the MPC of the location where the first device is located, the first device can determine a feedback dimension according to the MPC, and determine the first pilot pattern according to the feedback dimension.

[0375] Based on the scheme provided by the embodiment of the present application, the first pilot pattern used for transmitting a reference signal is determined according to the MPC, and channel estimation can be realized through the transmission of the reference signal. On the one hand, the channel measurement can be realized without decomposing the channel or the channel matrix, and the overhead of channel estimation can be reduced, and the complexity of channel estimation is reduced. On the other hand, the information of the MPC is fully utilized, and channel estimation through the MPC can be realized, and the overhead of channel estimation and feedback is reduced.

[0376] Alternatively, S1020, determining a feedback dimension according to the MPC, the feedback dimension including a time domain feedback dimension and a frequency domain feedback dimension, and the time domain feedback dimension and the frequency domain feedback dimension being used for determining a second time-frequency point, and the second time-frequency point being used for feeding back channel information.

[0377] Specifically, after determining the MPC of the location, the first device can determine the feedback dimension according to the MPC, and the second time-frequency point determined according to the feedback dimension can be used to send and / or receive the pilot signal. The second time-frequency point corresponds to a time-frequency point at which channel information needs to be fed back during channel feedback. The pilot signal can be used for channel measurement.

[0378] For example, the second time-frequency point can be determined according to the feedback dimension, and the time-frequency point determined according to the feedback dimension can indicate a time-frequency point at which channel measurement needs to be performed during channel estimation (i.e., the time-frequency point at which channel measurement needs to be performed during channel estimation is the second time-frequency point), or in other words, after determining the second time-frequency point, it is determined which channel information at which time-frequency point needs to be fed back during channel feedback. When performing channel estimation by transmitting the pilot signal, the time-frequency point corresponding to the second time-frequency point can be preferentially selected.

[0379] Based on the scheme provided in the embodiments of the present application, the feedback dimension used for transmitting the reference signal is determined by the MPC, and channel estimation can be implemented through transmission of the reference signal. On the one hand, channel measurement can be implemented without decomposing the channel or the channel matrix, and the overhead of channel estimation can be reduced, and the complexity of channel estimation can be reduced. On the other hand, the information of the MPC is fully utilized, channel estimation can be implemented through the MPC, and the overhead of channel estimation and feedback can be reduced.

[0380] In some possible implementation manners, the method 1000 can further include:

[0381] S1030, sending fourth indication information, and correspondingly, receiving the fourth indication information. The fourth indication information is used to indicate the first pilot pattern.

[0382] Specifically, after determining the first pilot pattern, the first device can send fourth indication information to the second device, and the fourth indication information can be used by the second device to determine the first pilot pattern.

[0383] For example, the fourth indication information can indicate the index of the first pilot pattern, and the second device can determine the first pilot pattern indicated by the index according to the index of the first pilot pattern.

[0384] FIG. 10 is a schematic diagram of a pilot pattern suitable for the embodiments of the present application. For example, as shown in FIG. 10, the pilot pattern shown in (a) of FIG. 10 or (b) of FIG. 10 can be a possible implementation of the first pilot pattern.

[0385] Based on the scheme provided in the embodiments of the present application, the first device and the second device can synchronize the first pilot pattern for transmitting the reference signal through the fourth indication information, the correct pilot pattern can be determined, the first time-frequency point for transmitting the reference signal can be determined through the first pilot pattern, the correct measurement of the reference signal at the receiving end (the end receiving the reference signal) can be realized, the corresponding channel state information can be acquired through the response of the reference signal, and the channel estimation can be realized.

[0386] In some possible implementation manners, the method further includes: sending second indication information, and correspondingly, receiving the second indication information. The second indication information is used to indicate the feedback dimension.

[0387] Specifically, after determining the feedback dimension, the first device can send the second indication information to the second device, and the second indication information can be used by the second device to determine the feedback dimension.

[0388] The cross-hatched arrow in FIG. 10 indicates the subcarrier with index 5 and the OFDM symbol with index 1, and the arrow without hatching indicates the subcarrier with index 0 and the OFDM symbols with indexes 0, 4 and 8. The subcarrier and the OFDM symbol indicated by the cross-hatched arrow can be a possible implementation of the feedback dimension.

[0389] Based on the scheme provided in the embodiments of the present application, the first device and the second device can synchronize the feedback dimension for feeding back the channel information through the second indication information, the time-frequency point for feeding back the channel information when feeding back the channel information (i.e., the time-frequency point for performing the channel measurement when performing the channel estimation is the second time-frequency point) can be determined through the feedback dimension, when performing the channel estimation through the transmission of the reference signal, the time-frequency point corresponding to the second time-frequency point can be preferentially selected, the correct feedback of the channel state information can be realized, and the channel estimation and the feedback can be realized.

[0390] In some possible implementation manners, the first pilot pattern is further used to indicate a first transmit antenna port, and the first transmit antenna port is used to transmit the pilot signal.

[0391] Specifically, the first transmit antenna port indicated by the first pilot pattern can occupy the second time-frequency point, and transmit the pilot signal.

[0392] Exemplarily, the first pilot pattern can indicate the first time-frequency point and the first transmit antenna port used to transmit the pilot signal. The number and / or position of the first time-frequency point and the number of the first transmit antenna port can be determined through the first pilot pattern.

[0393] Exemplarily, as shown in (a) of FIG. 10, according to (a) of FIG. 10, it can be determined that the number of the first transmission antenna ports is 5, and the indexes of the first transmission antenna ports are respectively set as 0-4; according to (a) of FIG. 10, it can be determined that the number of the first time-frequency points is 5, and the positions of the time-frequency points can be represented by (time domain index, frequency domain index). The time-frequency points represented by the small squares filled with dots or lines in (a) of FIG. 10 can correspond to different first transmission antenna ports respectively. For example, the first time-frequency point (1, 5) can correspond to the transmission antenna port 0, the first time-frequency point (0, 5) can correspond to the transmission antenna port 1, the first time-frequency point (4, 5) can correspond to the transmission antenna port 2, the first time-frequency point (8, 5) can correspond to the transmission antenna port 3, and the first time-frequency point (1, 0) can correspond to the transmission antenna port 4. Different first transmission antenna ports can occupy corresponding first time-frequency points to send the pilot signals.

[0394] Based on the scheme provided in the embodiments of the present application, the first device and the second device can synchronize the first transmission antenna ports for sending the reference signals through the fourth indication information, so that the receiving end (the end receiving the reference signals) can correctly measure the reference signals, obtain the corresponding channel state information through the response of the reference signals, and implement channel estimation.

[0395] In some possible implementation, the feedback dimension further includes a spatial domain feedback dimension, the spatial domain feedback dimension includes a transmission antenna feedback dimension and a receiving antenna feedback dimension, the transmission antenna feedback dimension is used to determine the first transmission antenna port, and the receiving antenna feedback dimension is used to determine the first receiving antenna port, the first transmission antenna port is used to send the pilot signal, and the first receiving antenna port is used to receive the pilot signal.

[0396] Specifically, the spatial domain feedback dimension can be determined according to the MPC, the first transmission antenna port used to send the pilot signal and the first receiving antenna port used to receive the pilot signal can be determined according to the spatial domain feedback dimension.

[0397] Exemplarily, the feedback dimension can indicate the time domain feedback dimension, the frequency domain feedback dimension and the spatial domain feedback dimension of the channel feedback information needed to be fed back when feeding back the channel information.

[0398] Exemplarily, as shown in FIG. 10, the OFDM symbol with index 1 in FIG. 10 can be a possible implementation of the position of the time domain indicated by the time domain feedback dimension, the subcarrier with index 5 can be a possible implementation of the position of the frequency domain indicated by the frequency domain feedback dimension, and the antenna port with index 0-4 can be a possible implementation of the first transmission antenna port.

[0399] Based on the scheme provided in the embodiments of the present application, the first device and the second device can synchronize the first transmitting antenna port for transmitting the reference signal and the first receiving antenna port for receiving the reference signal through the second indication information, and the corresponding channel state information can be acquired through the response of the reference signal, and correct feedback of the channel state information is realized, and channel feedback is realized.

[0400] The possible implementation of the first device determining the first pilot pattern or feedback dimension according to the MPC will be described in detail in combination with steps S1020-S1070.

[0401] In some possible implementation, in S1020, determining the first pilot pattern according to the MPC can include: determining the to-be-acquired parameter quantity N according to the MPC, N satisfying: N=n*N path , N path representing the number of paths determined according to the MPC, n being an integer greater than 0; determining the number of first time-frequency points and the spatial domain compression indication according to N, the spatial domain compression indication being used for indicating whether all the transmitting antenna ports are used for transmitting the pilot signals and whether all the receiving antenna ports are used for receiving the reference signals; and determining the number of first transmitting antenna ports according to N, the number of first time-frequency points and the spatial domain compression indication.

[0402] Specifically, the MPC can include at least one of DoA, DoD, power or delay, and the number of paths N path can be determined according to at least one of the above items, and N can be determined according to N path . According to N and the sparsity of the channel, whether all the transmitting antenna ports are used for transmitting the pilot signals can be determined, and then the number of first transmitting antenna ports can be determined.

[0403] According to N and the sparsity of the channel, whether all the receiving antenna ports are used for receiving the pilot signals can also be determined, and then the number of first receiving antenna ports can be determined.

[0404] The channel in wireless communication is usually affected by multipath propagation, forming a complex multipath fading effect. In many cases, most of the paths in these paths make very small contributions to the propagation of the signal, and a few paths dominate the propagation of the signal, which is called the sparsity of the channel. By utilizing the sparsity of the channel for channel estimation, the complexity of channel estimation can be reduced, and the accuracy of channel estimation can be improved.

[0405] For example, the number of paths of multipath can be determined according to any item in the MPC, for example, the number of paths N path can be determined according to the number of information contained in the DoD, and N can be determined according to N path and the time-frequency domain conversion module. For example, N=4N pathAccording to the determined N, it can be determined whether to perform spatial domain compression. After determining whether to perform spatial domain compression, the number of first time-frequency points can be determined according to N. According to N, the number of first time-frequency points and the spatial domain compression indication, the number of first transmit antenna ports can be determined.

[0406] For example, the spatial domain compression indication can be used to indicate whether the transmit antenna ports and the receive antenna ports are all used to transmit the pilot signals; for example, the spatial domain compression indication is 1, indicating that the spatial domain is compressed, the transmit antenna ports are not all used to transmit the pilot signals and the receive antenna ports are not all used to receive the pilot signals; the spatial domain compression indication is 0, indicating that the spatial domain is not compressed, the transmit antenna ports are all used to transmit the pilot signals and the receive antenna ports are all used to receive the pilot signals. Alternatively, the spatial domain compression indication is 0, indicating that the spatial domain is compressed, the transmit antenna ports are not all used to transmit the pilot signals and the receive antenna ports are not all used to receive the pilot signals; the spatial domain compression indication is 1, indicating that the spatial domain is not compressed, the transmit antenna ports are all used to transmit the pilot signals and the receive antenna ports are all used to receive the pilot signals.

[0407] Based on the scheme provided in the embodiments of the present application, the number of to-be-acquired parameters N is determined by MPC, the number of first time-frequency points, the spatial domain compression indication and the number of first transmit antenna ports are determined by N. On the one hand, without decomposing the channel or the channel matrix, the scheme can realize channel feedback using the sparsity of the channel, can realize smaller overhead of sparse channel feedback, and can reduce the complexity of sparse channel feedback. On the other hand, the number of paths is determined according to N, which can realize channel estimation using the sparsity of the channel, reduce the overhead of channel feedback, and also reduce the overhead of channel estimation. On the other hand, the number of first transmit antenna ports and the number of first time-frequency points are determined according to N, which can realize on-demand configuration of time-frequency points and antenna ports occupied by transmitted pilot signals, and reduce the resource overhead, measurement overhead and calculation overhead of channel estimation.

[0408] In some possible implementation manners, in S1020, determining the feedback dimension according to the MPC includes: determining the number of to-be-acquired parameters N according to the MPC, N satisfying: N = n * N path , N path represents the number of paths determined according to the MPC, n is an integer greater than 0; the second time-frequency point and the spatial domain compression indication are determined according to N, the spatial domain compression indication is used to indicate whether the transmit antenna ports are all used to transmit the pilot signals, and whether the receive antenna ports are all used to receive the pilot signals; the number of first transmit antenna ports and the number of first receive antenna ports are determined according to N, the second time-frequency point and the spatial domain compression indication.

[0409] Specifically, the MPC can include at least one of DoA, DoD, power or delay, and the number of paths N can be determined according to at least one of the above.path N can be determined according to the N path N can be determined according to the N and the sparsity of the channel. According to the N and the sparsity of the channel, it can be determined whether all the transmit antenna ports are used to transmit pilot signals and whether all the receive antenna ports are used to receive pilot signals. Further, the number of the first transmit antenna ports and the number of the first receive antenna ports can be determined.

[0410] The channel in wireless communication is usually affected by multipath propagation, forming complex multipath fading effects. In many cases, most of the paths contribute very little to the propagation of the signal, and a few paths dominate the propagation of the signal, which is called the sparsity of the channel. By utilizing the sparsity of the channel for channel estimation, the complexity of channel estimation can be reduced, and the accuracy of channel estimation can be improved.

[0411] For example, the number of paths can be determined according to any one of the MPCs, for example, the number of paths N can be determined according to the number of information contained in the DoD path N can be determined according to the N path N can be determined according to the N and the time-frequency domain conversion module. For example, N = 4N path According to the determined N, it can be determined whether to perform spatial domain compression. After determining whether to perform spatial domain compression, the number of the second time-frequency points can be determined according to the N. According to the N, the number of the second time-frequency points, and the spatial domain compression indication, the number of the first transmit antenna ports and the number of the first receive antenna ports can be determined.

[0412] For example, the spatial domain compression indication can be used to indicate whether the transmit antenna ports and the receive antenna ports are all used to transmit pilot signals; for example, the spatial domain compression indication is 1, indicating that the spatial domain is compressed, and the transmit antenna ports are not all used to transmit pilot signals and the receive antenna ports are not all used to receive pilot signals; the spatial domain compression indication is 0, indicating that the spatial domain is not compressed, and the transmit antenna ports are all used to transmit pilot signals and the receive antenna ports are all used to receive pilot signals. Alternatively, the spatial domain compression indication is 0, indicating that the spatial domain is compressed, and the transmit antenna ports are not all used to transmit pilot signals and the receive antenna ports are not all used to receive pilot signals; the spatial domain compression indication is 1, indicating that the spatial domain is not compressed, and the transmit antenna ports are all used to transmit pilot signals and the receive antenna ports are all used to receive pilot signals.

[0413] It can be understood that the above-mentioned indication of whether to compress the spatial domain by 0 or 1 is only one possible example, and the indication information of multiple bits can also be used to indicate whether to compress the spatial domain. For example, the spatial domain compression indication is 00, indicating that the spatial domain is compressed, and the spatial domain compression indication is 11, indicating that the spatial domain is not compressed, or other possible indication manners. Any indication information capable of distinguishing whether to compress the spatial domain can be used for the spatial domain compression indication, and the embodiments of the present application are not limited thereto.

[0414] Based on the scheme provided in the embodiments of the present application, the parameter quantity N to be acquired is determined by the MPC, and the second time-frequency point, the spatial compression indication, the number of the first transmitting antenna ports, and the number of the first receiving antenna ports are determined by N. On the one hand, without decomposing the channel or the channel matrix, the sparse channel feedback can be implemented, the overhead of the sparse channel feedback can be reduced, and the complexity of the sparse channel feedback can be reduced. On the other hand, the number of the paths is determined according to N, the sparse channel estimation can be implemented, the overhead of the channel feedback can be reduced, and the overhead of the channel estimation can be reduced. On the other hand, whether the transmitting antenna ports are all used for transmitting the pilot signals is determined according to N, the time-frequency points and the antenna ports occupied by the transmission of the pilot signals can be configured on demand, and the resource overhead, the measurement overhead, and the calculation overhead of the channel estimation can be reduced.

[0415] In some possible implementation manners, in S1020, the number of the first time-frequency points and the spatial compression indication are determined according to N, including: determining the number of the second time-frequency points according to N; determining the number of the first time-frequency points and the spatial compression indication according to the number of the second time-frequency points, the number of the first transmitting antenna ports, and a first density, the first density representing the number of the time-frequency points occupied by each first transmitting antenna port for transmitting the pilot signals; wherein the number of the first time-frequency points is greater than or equal to the number of the second time-frequency points, or the number of the first time-frequency points is less than the number of the second time-frequency points.

[0416] Specifically, the number of the first time-frequency points is equal to the product of the number of the first transmitting antenna ports and the first density, and the number of the second time-frequency points can be determined according to N. When the number of the second time-frequency points is greater than or equal to the number of the first time-frequency points, part or all of the second time-frequency points can be selected as the first time-frequency points, and the first device or the second device can transmit the pilot signals by occupying the first time-frequency points; when the number of the second time-frequency points is less than the number of the first time-frequency points, all of the second time-frequency points and other time-frequency points (for example, third time-frequency points) can be selected as the first time-frequency points, and the transmitting antenna ports can transmit the pilot signals by occupying the first time-frequency points.

[0417] For example, the number of the second time-frequency points determined according to N is 1. When the number of the first transmitting antenna ports is equal to 5 and the first density is equal to 1, the number of the first time-frequency points is 5. The number of the first time-frequency points is less than the number of the second time-frequency points, and 4 time-frequency points (for example, the 4 time-frequency points are referred to as third time-frequency points) need to be added, so that each of the 5 first transmitting antenna ports can occupy a first time-frequency point to transmit the pilot signals.

[0418] For example, as shown in (b) of FIG. 10, according to (b) of FIG. 10, the number of the first transmit antenna ports can be determined as 5, and the indexes of the first transmit antenna ports are set as 0-4 respectively. According to (b) of FIG. 10, the number of the first time-frequency points can be determined as 10, and the positions of the time-frequency points can be represented by (time domain index, frequency domain index). The time-frequency points represented by the small squares filled with dots or lines in (b) of FIG. 10 can correspond to the first transmit antenna ports. For example, the first time-frequency points (1, 5) and (1, 1) can correspond to the transmit antenna port 0, the first time-frequency points (0, 5) and (0, 0) can correspond to the transmit antenna port 1, the first time-frequency points (4, 5) and (4, 0) can correspond to the transmit antenna port 2, the first time-frequency points (8, 5) and (8, 0) can correspond to the transmit antenna port 3, and the first time-frequency points (1, 0) and (0, 1) can correspond to the transmit antenna port 4. Different first transmit antenna ports can occupy corresponding first time-frequency points to send pilot signals.

[0419] For example, according to N, the number of the second time-frequency points is 5. When the number of the first transmit antenna ports is equal to 1 and the first density is equal to 2, the number of the first time-frequency points is 2. The number of the first time-frequency points is less than the number of the second time-frequency points, and 2 time-frequency points can be selected from the second time-frequency points as the first time-frequency points, so that 1 first transmit antenna port can occupy 2 first time-frequency points to send pilot signals.

[0420] Based on the scheme provided in the embodiments of the present application, when the second time-frequency points determined according to N cannot meet the time-frequency points that need to be occupied by the first transmit antenna ports to send pilot signals, the transmission of the pilot signals can be realized through the newly added time-frequency points.

[0421] In some possible implementation manners, the number of the second time-frequency points is determined according to a time domain feedback dimension and a frequency domain feedback dimension, the number of the first transmit antenna ports is determined according to a space domain feedback dimension, the time domain feedback dimension The frequency domain feedback dimension The transmit antenna feedback dimension The receive antenna feedback dimension satisfies:

[0422] In some possible implementation manners, the number of the first receive antenna ports is determined according to the space domain feedback dimension.

[0423] Specifically, the number of the second time-frequency points is guaranteed

[0424] For example, when determining the feedback dimension of the feedback channel information or the first pilot pattern by using the method 1000, A quantity representing a measurement result that can be obtained by measuring a channel through a pilot signal, when a time domain feedback dimension A frequency domain feedback dimension A transmit antenna feedback dimension A receive antenna feedback dimension Satisfies It can be ensured that the random phase corresponding to each path has a unique solution.

[0425] Exemplarily, the number of the first transmit antenna ports is determined according to the transmit antenna feedback dimension.

[0426] Exemplarily, the number of the first receive antenna ports is determined according to the receive antenna feedback dimension.

[0427] Based on the scheme provided in the embodiments of the present application, by On the one hand, by determining the feedback dimension for channel measurement according to the quantity of the to-be-acquired parameters, the overhead of channel feedback can be reduced, and the overhead of channel estimation can also be reduced; on the other hand, sparse channel measurement can be implemented while adjusting the time domain feedback dimension, the frequency domain feedback dimension, or the spatial domain feedback dimension, which is helpful to improve the flexible setting of the measurement dimension in sparse channel measurement.

[0428] In some possible implementation manners, Satisfies: Satisfies: N Rx and N Tx satisfy: N Rx N Tx ≥ N, N Tx represents the number of transmit antenna ports, N Rx represents the number of receive antenna ports.

[0429] Specifically, N Rx and N Tx satisfy N Rx N Tx ≥ N, the time domain feedback dimension and the frequency domain feedback dimension can be set to 1, and by adjusting the spatial domain feedback dimension, it can be ensured that

[0430] In a narrow-band system with a relatively narrow bandwidth, the channel characteristics of different frequency points can be similar, and a larger spatial domain feedback dimension can obtain more accurate measurement results.

[0431] Based on the scheme provided in the embodiments of the present application, N Rx N TxWhen N is greater than or equal to 2, the time domain feedback dimension and the frequency domain feedback dimension used for transmitting the pilot signal and the feedback channel information can be compressed preferentially, and a greater spatial domain feedback dimension can be determined. For a narrowband system with a relatively narrow bandwidth of a signal, the result of channel estimation obtained through the greater spatial domain feedback dimension can more accurately reflect the state of the channel.

[0432] In some possible implementation manners, satisfies: satisfies: N Rx and N Tx satisfies: N Rx N Tx <N, N Tx indicates the number of transmit antenna ports of the first device, N Rx indicates the number of receive antenna ports of the second device.

[0433] Specifically, N Rx and N Tx satisfies N Rx N Tx When N is less than 2, the spatial domain feedback dimension can not be compressed, and the time domain feedback dimension and the frequency domain feedback dimension are adjusted to ensure

[0434] Exemplarily, N Tx indicates the number of transmit antenna ports of the first device, N Rx indicates the number of receive antenna ports of the second device, and the first device is configured to transmit the pilot signal, and the second device is configured to receive the pilot signal; or, N Tx indicates the number of transmit antenna ports of the second device, N Rx indicates the number of receive antenna ports of the first device, and the first device is configured to receive the pilot signal, and the second device is configured to transmit the pilot signal.

[0435] Based on the scheme provided in the embodiments of the present application, N Rx and N Tx satisfies N Rx N Tx When N is less than 2, the spatial domain feedback dimension is not compressed, and the maximum spatial domain feedback dimension can be ensured. For a narrowband system with a relatively narrow bandwidth of a signal, the result of channel estimation obtained through the greater spatial domain feedback dimension can more accurately reflect the state of the channel.

[0436] In some possible implementation manners, satisfies: M indicates the rank of the first channel matrix or the number of first eigenvalues of the first channel matrix, the first eigenvalue is an eigenvalue greater than or equal to a first threshold value, and the first channel matrix is determined according to MPC; satisfies: N Tx denotes the number of transmit antenna ports, min() denotes the minimum function, and max() denotes the maximum function.

[0437] Specifically, N Rx and N Tx satisfy N Rx N Tx ≥ N, the spatial domain feedback dimension can be adjusted by the rank or eigenvalue of the first channel matrix.

[0438] For example, the first channel matrix may be determined according to the MPC, time-frequency domain conversion, and the first phase. The first phase can be a randomly set phase value.

[0439] For example, if the MIMO system includes N1 transmit antenna ports and N2 receive antenna ports and the antenna array is arranged in a plane, the channel matrix may be a two-dimensional N2×N1 matrix, and the channel matrix can also be a N2×N1×NF×NT matrix, where NF represents the original dimension of the frequency domain, and NT represents the original dimension of the time domain. In the two-dimensional channel matrix, the rows correspond to the receive antennas, and the columns correspond to the transmit antennas. The elements in the matrix can be denoted as h ij , where h ij represents the channel response from the i-th transmit antenna to the j-th receive antenna.

[0440] In some cases, the channel matrix can be sparse, i.e., only a few elements are non-zero. This is common in a multipath environment, as the signal can only propagate through a few dominant paths.

[0441] According to the first channel matrix , the rank of the first channel matrix and / or the first eigenvalue of the first channel matrix may be determined. According to the rank of the first channel matrix and / or the first eigenvalue of the first channel matrix , the value of and / or may be determined. denotes the number of receive antenna ports receiving the pilot signal for channel estimation, denotes the number of transmit antenna ports transmitting the pilot signal for channel estimation. The value of may be wherein rank represents rank, # (eigenvalue () > Threshold) represents the number of eigenvalues greater than the threshold value in the eigenvalues of the matrix, # () represents the number of, and Threshold can be a possible implementation of the first threshold value. The first threshold value can be determined by standard specification, manufacturer pre-configuration, high layer signaling (for example, radio resource control (RRC)) pre-configuration or pre-definition, or device (for example, NW or UE) real-time configuration / feedback. Correspondingly, the number of transmission (or reception) antenna ports for transmitting (or receiving) pilot signals for channel estimation can be represented by (or ) represents, and the measurement dimension of the transmission (or reception) antenna can have the following several setting modes:

[0442] Or

[0443] Or

[0444] ; or

[0445] The number of non-zero eigenvalues of the channel matrix is equal to the rank of the channel matrix, which represents the maximum number of independent data streams that the channel can support. The eigenvalue represents the attenuation degree of the signal in different spatial modes, and the larger the eigenvalue, the smaller the attenuation of the signal in the mode, and the better the channel condition. Strong flow usually refers to the signal flow with a larger eigenvalue in the MIMO system, which indicates that the signal attenuation in these directions is smaller and the channel condition is better.

[0446] Based on the scheme provided in the embodiments of the application, by limiting the rank of the channel matrix or the first threshold value, the spatial domain feedback dimension can be set according to the number of strong flows, which is beneficial to optimizing the transmission of pilot signals and the feedback of channel information, and improving the measurement performance of channel estimation and feedback.

[0447] In some possible implementation manners, before determining the first pilot pattern according to the MPC, the method 1000 can further include:

[0448] S1040, obtaining antenna indication information. The antenna indication information is used to indicate the number of transmission antenna ports and the number of reception antenna ports of the second device.

[0449] Illustratively, the first device can receive the antenna indication information, and the second device can send the antenna indication information. The antenna indication information can indicate the number of transmission antenna ports and the number of reception antenna ports of the second device.

[0450] Exemplarily, before the first device determines the first pilot pattern or the feedback dimension, if the number of the transmit antenna ports and the number of the receive antenna ports of the second device are known, the first device can not receive the antenna indication information.

[0451] Exemplarily, according to the number of the transmit antenna ports and the number of the receive antenna ports of the second device, and the number of the transmit antenna ports and the number of the receive antenna ports of the first device, the first device can determine the number of the transmit antenna ports of the device sending the pilot signal as N Tx determine the number of the receive antenna ports of the device receiving the pilot signal as N Rx .

[0452] Based on the scheme provided in the embodiments of the present application, the first device can determine the number of the transmit antenna ports and the number of the receive antenna ports of the second device according to the antenna indication information, and further can realize the configuration of the spatial domain feedback dimension.

[0453] In some possible implementation manners, after the feedback dimension is determined according to the MPC, the method 1000 can further include:

[0454] S1050, sending first indication information, and correspondingly, receiving the first indication information, the first indication information being used for indicating the first pilot pattern, and the first indication information including at least one of the following: the first density; time-frequency domain priority indication information; time-frequency domain and / or spatial domain ordering indication information.

[0455] Specifically, the first device can send the first indication information, and the second device can receive the first indication information. The time-frequency domain priority indication information and the time-frequency domain and / or spatial domain ordering indication information can indicate the order of determining the first time-frequency point from the second time-frequency point.

[0456] Exemplarily, the time-frequency domain priority indication information can indicate that the first time-frequency point is determined from the second time-frequency point according to the mapping order of first time domain and then frequency domain / the mapping order of first frequency domain and then time domain; and the time-frequency domain and / or spatial domain ordering indication information can indicate that the first time-frequency point is determined from the second time-frequency point in the order or in the reverse order in the time-frequency domain and / or the spatial domain.

[0457] In a wideband system with a wide bandwidth, the channel characteristics between different frequency points can have a large difference, and the pilot signal preferentially covering the frequency domain can more fully realize the coverage of the bandwidth; in a narrowband system with a narrow bandwidth, the channel characteristics between different frequency points can have a small difference, and preferentially covering the frequency domain can cause redundancy of the measurement, and the result of the channel measurement is not comprehensive enough.

[0458] For a wideband system with a wide bandwidth of the signal, the result of the channel estimation obtained through a larger time domain feedback dimension and a frequency domain feedback dimension can more accurately reflect the state of the channel. For the wideband system, the mapping order of first frequency domain and then time domain can be preferred.

[0459] For a narrowband system, the mapping order of time domain first and then frequency domain can be preferred.

[0460] For example, 1 can be used to indicate time domain first (i.e., the mapping order of time domain first and then frequency domain), and 0 can be used to indicate frequency domain first (i.e., the mapping order of frequency domain first and then time domain); or 0 can be used to indicate time domain first (i.e., the mapping order of time domain first and then frequency domain), and 1 can be used to indicate frequency domain first (i.e., the mapping order of frequency domain first and then time domain).

[0461] It can be understood that the value of the time-frequency domain priority indication information is only an example, and any indication information that can distinguish time domain priority or frequency domain priority can be used as a possible implementation of the time-frequency domain priority indication information, and the embodiments of the present application do not limit this.

[0462] For example, 1 can be used to indicate that the first time-frequency point is determined from the second time-frequency point in the time-frequency domain and / or the spatial domain in sequence, and 0 can be used to indicate that the first time-frequency point is determined from the second time-frequency point in the time-frequency domain and / or the spatial domain in reverse sequence; or 0 can be used to indicate that the first time-frequency point is determined from the second time-frequency point in the time-frequency domain and / or the spatial domain in sequence, and 1 can be used to indicate that the first time-frequency point is determined from the second time-frequency point in the time-frequency domain and / or the spatial domain in reverse sequence.

[0463] It can be understood that the value of the time-frequency domain and / or spatial domain ordering indication information is only an example, and any indication information that can distinguish the order or reverse order of determining the first time-frequency point from the second time-frequency point in the time-frequency domain and / or the spatial domain can be used as a possible implementation of the time-frequency domain and / or spatial domain ordering indication information, and the embodiments of the present application do not limit this.

[0464] Based on the scheme provided in the embodiments of the present application, the first device and the second device can synchronize the ordering of the first time-frequency point through the first indication information, obtain the corresponding channel state information through the response of the pilot signal, and correctly feed back the channel state information, thereby realizing channel feedback.

[0465] In some possible implementation manners, when the number of the first time-frequency points is greater than the number of the second time-frequency points, the first time-frequency points further include third time-frequency points, and the first indication information further indicates the positions of the third time-frequency points.

[0466] For example, the first indication information can indicate the time domain feedback dimension and the frequency domain feedback dimension corresponding to the third time-frequency points.

[0467] For the convenience of description, the feedback dimension corresponding to the second time-frequency point is denoted as feedback dimension #1, the time domain feedback dimension included in the feedback dimension #1 is denoted as time domain feedback dimension #1, and the frequency domain feedback dimension included in the feedback dimension #1 is denoted as frequency domain feedback dimension #1; the feedback dimension corresponding to the third time-frequency point is denoted as feedback dimension #2, the time domain feedback dimension included in the feedback dimension #2 is denoted as time domain feedback dimension #2, and the frequency domain feedback dimension included in the feedback dimension #2 is denoted as frequency domain feedback dimension #2.

[0468] The time domain feedback dimension #2 and the frequency domain feedback dimension #2 are used to determine the third time-frequency point.

[0469] Specifically, after the first device determines the feedback dimension #2, the first device can send first indication information, and the second device can receive the first indication information. The first indication information can be used to determine the position of the third time-frequency point.

[0470] For example, the first indication information can indicate the time domain feedback dimension #2 and the frequency domain feedback dimension #2.

[0471] For example, the first indication information can include the identity (ID) (or index) of the time domain feedback dimension #2 and the ID (or index) of the frequency domain feedback dimension #2.

[0472] For example, when the third time-frequency point is determined according to uniform sampling, the time domain feedback dimension #2 and the frequency domain feedback dimension #2, the first indication information can further include related parameters of the uniform sampling. For example, indication information indicating the starting point of sampling or the interval of sampling.

[0473] For example, the first indication information can indicate the position and the number of the third time-frequency point.

[0474] For example, the fourth indication information can include the first indication information.

[0475] Based on the scheme provided in the embodiments of the present application, the first device and the second device can synchronize the position of the third time-frequency point of the pilot signal through the first indication information, obtain the corresponding channel state information through the response of the pilot signal, and realize correct feedback of the channel state information and channel feedback.

[0476] In some possible implementation manners, the method 1000 can further include:

[0477] S1060, sending second indication information, and correspondingly, receiving the second indication information. The second indication information indicates the feedback dimension.

[0478] Specifically, the first device can send the second indication information after determining the feedback dimension #1, and the second device can receive the second indication information, which can be used to determine the location of the second time-frequency point, the spatial compression indication, the location of the first transmitting antenna port, and the location of the first receiving antenna port.

[0479] For example, the second indication information can indicate the time domain feedback dimension #1 and the frequency domain feedback dimension #1.

[0480] For example, the second indication information can include the ID (or index) of the time domain feedback dimension #1 and the ID (or index) of the frequency domain feedback dimension #1.

[0481] For example, when the second time-frequency point is determined according to uniform sampling, the time domain feedback dimension #1, and the frequency domain feedback dimension #1, the second indication information can further include related parameters of the uniform sampling. For example, indication information indicating the starting point of sampling or the interval of sampling.

[0482] For example, the second indication information can indicate the location and number of the second time-frequency point, and / or the second indication information can indicate the location and number of the first transmitting antenna port, and / or the second indication information can indicate the location and number of the first receiving antenna port.

[0483] For example, the fourth indication information can include the second indication information.

[0484] Based on the scheme provided in the embodiments of the present application, the first device and the second device can synchronize the time-frequency point of the channel information to be fed back, the spatial compression indication, the location of the first transmitting antenna port, and the location of the first receiving antenna port through the second indication information when performing channel feedback, so as to realize correct measurement of the pilot signal at the receiving end (the end receiving the pilot signal), obtain the corresponding channel state information through the response of the pilot signal, and realize correct feedback of the channel state information, thereby realizing channel estimation and feedback.

[0485] In some possible implementation manners, the method 1000 can further include:

[0486] S1070, according to the feedback dimension #1, randomly selecting the second time-frequency point from the pre-allocated time-frequency resource and randomly selecting the first transmitting antenna port from the pre-allocated antenna port; or, according to the feedback dimension #1, equally interval selecting the second time-frequency point from the pre-allocated time-frequency resource and equally interval selecting the first transmitting antenna port from the pre-allocated antenna port; or, according to the feedback dimension #1, selecting the second time-frequency point from a pre-set time-frequency point set and selecting the first transmitting antenna port from a pre-set antenna port set.

[0487] Exemplarily, the pre-allocated time-frequency resources can include system time-frequency resources, and any of the first time-frequency point, the second time-frequency point or the third time-frequency point can include a resource element (RE). For example, one time-frequency point can be regarded as one RE. For example, the RE can include a subcarrier and an orthogonal frequency division multiplexing (OFDM) symbol.

[0488] Exemplarily, when the first device selects the second time-frequency point from the pre-allocated time-frequency resources and selects the first transmitting antenna port from the pre-allocated antenna ports, if N Tx N Rx ≥ N, the spatial domain feedback dimension can be compressed, and the transmitting antenna port or the receiving antenna port needs to be encoded according to the original spatial domain. The first device needs to synchronize with the second device to encode the position of the second time-frequency point, the first transmitting antenna port and the first receiving antenna port determined according to the method 1000. If N Tx N Rx <N, the spatial domain feedback dimension can not be compressed, and the original time domain and frequency domain need to be encoded, and the first device needs to synchronize with the second device to determine the second time-frequency point according to the method 1000, and there is no need to synchronize the position encoding of the first transmitting antenna port and the first receiving antenna port.

[0489] In some possible implementation manners, before determining the first pilot pattern according to the MPC, the method further includes: randomly selecting the first receiving antenna port from the pre-allocated antenna ports according to the feedback dimension; or, equally spacing selecting the first receiving antenna port from the pre-allocated antenna ports according to the feedback dimension; or, selecting the first receiving antenna port from a preset antenna port set according to the feedback dimension.

[0490] The following exemplary detailed description is given under the condition of channel variation. Possible implementation manners of determining the second time-frequency point, the first transmitting antenna port or the first receiving antenna port according to the feedback dimension #1.

[0491] Exemplarily, when the position of the first device and / or the second device or the antenna port configuration or the system configuration changes, the channel will change. Under the condition of channel variation, the time domain feedback dimension, the frequency domain feedback dimension and / or the spatial domain feedback dimension can change. For the time domain feedback dimension, the frequency domain feedback dimension and / or the spatial domain feedback dimension at different time points, the time domain feedback dimension, the frequency domain feedback dimension and / or the spatial domain feedback dimension at the next time point can be determined through two modes of independent selection or nested selection.

[0492] Independent selection refers to determining the second time-frequency point, the first transmitting antenna port and the first receiving antenna port independently according to the feedback dimension 1 in different time periods, and the second time-frequency point, the first transmitting antenna port and the first receiving antenna port determined at each time do not depend on the second time-frequency point, the first transmitting antenna port and the first receiving antenna port determined at other times, and the position encoding of the simultaneously determined time-frequency point and antenna port needs to be synchronized.

[0493] Nested selection refers to that at different time periods, the time-frequency point, the first transmitting antenna port and the first receiving antenna port determined at the current time can be preferentially reused from those determined at the previous time.

[0494] For example, if N Tx N Rx ≥N, the second time-frequency point determined at the current time is still the second time-frequency point determined at the previous time, the first transmitting antenna port determined at the current time preferentially reuses the first transmitting antenna port determined at the previous time, and the first receiving antenna port determined at the current time preferentially reuses the first receiving antenna port determined at the previous time.

[0495] Taking the receiving antenna port as an example, if the number of the first receiving antenna port determined at T+1 time is greater than the number of the first receiving antenna port determined at T time , a part of the first receiving antenna port at T+1 time can reuse the first receiving antenna port determined at T time , and receiving antenna ports not used can be randomly selected from the receiving antenna ports as another part of the first receiving antenna port, and only the position encoding of the other part of the first receiving antenna port needs to be synchronized; if the number of the first receiving antenna port determined at T+1 time is less than the number of the first receiving antenna port determined at T time , the first receiving antenna port determined at T time (or the last receiving antenna port) can be reused; or receiving antenna ports can be uniformly sampled from the receiving antenna ports as the first receiving antenna port.

[0496] The nested selection mode can be specified by a standard, preconfigured by a manufacturer, or preconfigured by a high layer signaling (RRC). The nested selection mode can also be configured by the NW in real time, for example, identified by 2-bit indication information. Among them, 00 represents reusing the first receiving antenna port, 01 represents reusing the last receiving antenna port, 10 represents uniformly sampling from the receiving antenna port determined at the previous time (at this time, the sampling interval of the sampling needs to be indicated) receiving antenna port, and the position encoding of the simultaneously determined time-frequency point and antenna port also needs to be synchronized (or ).

[0497] The above describes one possible implementation of nested selection taking the receiving antenna port as an example. The possible implementation of nested selection for the transmitting antenna port is similar to that of the receiving antenna port, and details are not described herein again.

[0498] It can be understood that the value of the indication information used to identify the different nested selection manners is only an example, and any indication information that can distinguish different nested selection manners can be used as a possible implementation of the indication information used to identify the nested selection manner. The above description of using 2 bits of indication information is only an example and does not limit the solutions provided in the present application. The number of bits of the indication information and the nested selection manner corresponding to different indication information are not limited herein.

[0499] For example, if N Tx N Rx When N Tx N Rx When N

[0500] For the feedback dimension #1 at different time instants, the second time-frequency point, the first transmitting antenna port and the first receiving antenna port can be determined by random selection or uniform selection in the pre-allocated time-frequency resource or antenna port through independent selection or nested selection. When the second time-frequency point, the first transmitting antenna port and the first receiving antenna port are determined by uniform selection, the sampling interval and the starting point of sampling need to be determined. The sampling interval and the starting point of sampling can be determined by standard specification, manufacturer pre-configuration, high-layer signaling (RRC) pre-configuration; or the sampling interval set can be determined by standard specification, manufacturer pre-configuration, high-layer signaling (RRC) pre-configuration, and the sampling interval and the starting point are configured by the NW in real time (for example, the sampling interval can be selected from the pre-set set); or the sampling interval and the starting point can be configured by the NW in real time (for example, the sampling interval is not limited and can be configured by the NW in real time).

[0501] In some possible implementation manners, the method 1000 can further include:

[0502] S1080, sending third indication information, and correspondingly, receiving the third indication information. The third indication information is used to indicate that the second time-frequency point and the first transmitting antenna port are determined by the equal interval mode or the variable interval mode in the case that the feedback dimension #1 at different time instants is different; when the variable interval mode is used, the third indication information includes the sampling interval and the sampling starting point corresponding to different time instants.

[0503] When the position or antenna port configuration or system configuration of the first device and / or the second device changes, the channel changes. When the channel changes, the feedback dimension #1 can change. For the feedback dimension #1 at different time instants, the feedback dimension #1 at the next time instant can be determined by equal-interval uniform selection or variable-interval uniform selection. Whether the feedback dimension #1 at the next time instant is determined by equal-interval uniform selection or variable-interval uniform selection can be determined by a standard, a manufacturer pre-configuration, or a high-layer signaling (RRC) pre-configuration. Equal-interval uniform selection means that the sampling intervals used in different time intervals are the same, and there is no need to synchronize the sampling intervals in each time interval. Variable-interval uniform selection means that the sampling intervals used in different time intervals can be different, and there is a need to synchronize the sampling intervals in each time interval.

[0504] The first device can also select the second time-frequency point and the first transmission antenna port according to the preset time-frequency point set and the preset antenna port set.

[0505] The number of sets to which the second time-frequency point or the first transmission antenna port or the first reception antenna port belongs can be configured for the time domain, the frequency domain, and the spatial domain, respectively. The sets to which the second time-frequency point or the first transmission antenna port or the first reception antenna port belongs, and the corresponding relationship can be determined by a standard, a manufacturer pre-configuration, or a high-layer signaling (RRC) configuration. According to the feedback dimension #1, a set with a number close to and greater than the corresponding time domain feedback dimension #1, frequency domain feedback dimension #1, or spatial domain feedback dimension can be selected from the sets.

[0506] For example, as shown in Table 1, taking the reception antenna port as an example, if According to Table 1, set 0 can be selected; if According to Table 1, set 1 can be selected; if According to Table 1, set 2 can be selected. The number of antenna ports in the set is greater than When the number of antenna ports in the set is greater than antenna ports in the set can be randomly selected or selected according to other rules as the first reception antenna port for receiving the pilot signal.

[0507] When the feedback dimension #1 is synchronized, the time domain feedback dimension #1, the frequency domain feedback dimension #1, and / or the spatial domain feedback dimension need to be synchronized, or the pre-configuration set ID of the time domain feedback dimension #1, the frequency domain feedback dimension #1, and / or the spatial domain feedback dimension needs to be synchronized (for example, taking the reception antenna feedback dimension as an example, if the reception antenna feedback dimension is 2, according to the configuration of Table 1, set 1 needs to be selected, and the first device and the second device need to synchronize ID 1).

[0508] Table 1: Configuration table of reception antenna feedback dimension

[0509] Exemplarily, as shown in Table 2, taking the transmitting antenna port as an example, if Set 0 can be selected according to Table 1; if Set 1 can be selected according to Table 1; if Set 2 can be selected according to Table 1. The number of antenna ports in the set is greater than The first transmitting antenna port receiving the pilot signal can be randomly selected in the set or selected according to other rules.

[0510] In the synchronization feedback dimension #1, the time domain feedback dimension #1, the frequency domain feedback dimension #1 and / or the space domain feedback dimension need to be synchronized, or the preconfigured set ID of the time domain feedback dimension #1, the frequency domain feedback dimension #1 and / or the space domain feedback dimension need to be synchronized (taking the transmitting antenna feedback dimension as an example, if the transmitting antenna feedback dimension is 2, according to the configuration of Table 1, set 1 needs to be selected, and the first device and the second device need to synchronize ID 1).

[0511] Table 2: Configuration table of transmitting antenna feedback dimension

[0512] Exemplarily, as shown in Table 3, taking the second time-frequency point as an example, if Set 0 can be selected according to Table 1; if Set 1 can be selected according to Table 1; if Set 2 can be selected according to Table 1.

[0513] In the synchronization feedback dimension #1, the time domain feedback dimension #1, the frequency domain feedback dimension #1 and / or the space domain feedback dimension need to be synchronized, or the preconfigured set ID of the time domain feedback dimension #1, the frequency domain feedback dimension #1 and / or the space domain feedback dimension need to be synchronized (taking the receiving antenna feedback dimension as an example, if the receiving antenna feedback dimension is 2, according to the configuration of Table 1, set 1 needs to be selected, and the first device and the second device need to synchronize ID 1).

[0514] Table 3: Configuration table of time-frequency feedback dimension

[0515] Based on the scheme provided in the embodiments of the present application, through the feedback dimension #1, the second time-frequency point, the first transmitting antenna port or the first receiving antenna port can be randomly selected, equally spaced or selected from a preset set, so as to realize the determination of the second time-frequency point, the first transmitting antenna port or the first receiving antenna port.

[0516] ​It can be understood that the way of determining the third time-frequency point according to the time domain feedback dimension #2 and the frequency domain feedback dimension #2 can be the same as the way of determining the second time-frequency point according to the time domain feedback dimension #1 and the frequency domain feedback dimension #1. Embodiments of the present application will not be described again.

[0517] The following describes a possible implementation of determining the second time-frequency point and the first transmitting antenna port according to the feedback dimension #1 in conjunction with FIG. 10.

[0518] In (a) of FIG. 10, the cross-line filled arrow respectively indicates the subcarrier with index 5 and the OFDM symbol with index 1, and the unfilled arrow respectively indicates the subcarrier with index 0 and the OFDM symbol with index 0, 4, 8. The subcarrier indicated by the cross-line filled arrow can be a possible implementation of the frequency domain feedback dimension #1 determined according to the method 1000 shown in FIG. 9. The OFDM symbol indicated by the cross-line filled arrow can be a possible implementation of the time domain feedback dimension #1 determined according to the method 1000 shown in FIG. 9.

[0519] ​The time-frequency points occupied by the pilot signals can be determined by preferentially covering the time domain (for example, the mapping order of time domain first and frequency domain second). As shown in (a) of FIG. 10, when the feedback dimensions of the time domain and the frequency domain are both set to 1 and the first density is 1, for example, when the number of the first transmission antenna ports is 1 and the first density is 1, the first transmission antenna port can send the pilot signals through the time-frequency point with index 0. For another example, when the number of the first transmission antenna ports is 5 and the first density is 1, the first transmission antenna port needs to occupy 5 time-frequency points to send the pilot signals. To enable all the first transmission antenna ports to occupy the time-frequency points to send the pilot signals, the subcarriers and OFDM symbols for sending the pilot signals need to be added. The added subcarrier index is 0, and the added OFDM symbol indexes are 0, 4, and 8. Through the added subcarriers, OFDM symbols, the subcarrier with index 5, and the OFDM symbol with index 1, 8 time-frequency points can be determined. The positions of the 8 time-frequency points are represented by (time domain index, frequency domain index) as follows: (0, 0), (1, 0), (4, 0), (8, 0), (0, 5), (1, 5), (4, 5), and (8, 5). Among the 8 time-frequency points, the time-frequency points can be determined according to the time-frequency point determined by preferentially selecting the subcarrier with index 5 and the OFDM symbol with index 1, the time-frequency point determined by preferentially selecting the subcarrier with index 5 and the added OFDM symbol, and the time-frequency point determined by preferentially selecting the subcarrier with index 0 and the added OFDM symbol. For example, the time-frequency points occupied by the pilot signals sent by the first transmission antenna port are sequentially (1, 5), (0, 5), (4, 5), (8, 5), and (1, 0) in order.

[0520] As shown in (b) of FIG. 10, when the feedback dimension in time domain and frequency domain is both set to 1 and the first density is 2, the time-frequency points occupied by the pilot signals can be determined by preferentially covering the time domain (for example, the mapping order of time domain first and then frequency domain). For example, when the number of first transmission antenna ports is 5 and the first density is 2, the time-frequency points occupied by the pilot signals sent by each first transmission antenna port are 2. In order to enable all first transmission antenna ports to occupy time-frequency points to send pilot signals, subcarriers and OFDM symbols for sending pilot signals need to be added. The added subcarrier indexes are 0 and 1, and the added OFDM symbol indexes are 0, 4 and 8. Through the added subcarriers, OFDM symbols, the subcarrier with index 5 and the OFDM symbol with index 1, 12 time-frequency points can be determined. The positions of the 12 time-frequency points are represented by (time domain index, frequency domain index) as follows: (0, 0), (1, 0), (4, 0), (8, 0), (0, 1), (1, 1), (4, 1), (8, 1), (0, 5), (1, 5), (4, 5), (8, 5), (0, 1), (1, 1). Among the 12 time-frequency points, the time-frequency points occupied by the transmission antenna ports can be determined according to the time-frequency point covering order of first preferentially determining the time-frequency points determined by the subcarrier with index 5 and the OFDM symbol with index 1, second preferentially determining the time-frequency points determined by the subcarrier with index 5 and the added OFDM symbol, third preferentially determining the time-frequency points determined by the OFDM symbol with index 1 and the added subcarrier, and then preferentially determining the time-frequency points determined by the added subcarrier and the added OFDM symbol. Among the added OFDM symbols or added subcarriers, the covering can be performed according to the following order: first preferentially covering the subcarrier with small index and the OFDM symbol with small index, second preferentially covering the subcarrier with small index and the OFDM symbol with large index, and then covering the subcarrier with large index and the OFDM symbol with small index. For example, the time-frequency points occupied by the pilot signals sent by the first transmission antenna port in order are as follows: the time-frequency point with index 0 (1, 5), the time-frequency point with index 1 (0, 5), the time-frequency point with index 2 (4, 5), the time-frequency point with index 3 (8, 5) and the time-frequency point with index 4 (1, 0), the time-frequency point with index 5 (1, 1), the time-frequency point with index 6 (0, 0), the time-frequency point with index 7 (4, 0), the time-frequency point with index 8 (8, 0) and the time-frequency point with index 9 (0, 1).

[0521] If the indexes of the 5 first transmit antenna ports are set as transmit antenna port 0, transmit antenna port 1, transmit antenna port 2, transmit antenna port 3 and transmit antenna port 4 respectively, exemplary, in (b) of FIG. 10, transmit antenna port 0 can occupy the time-frequency point with index 0 and the time-frequency point with index 5, transmit antenna port 1 can occupy the time-frequency point with index 1 and the time-frequency point with index 6, transmit antenna port 2 can occupy the time-frequency point with index 2 and the time-frequency point with index 7, transmit antenna port 3 can occupy the time-frequency point with index 3 and the time-frequency point with index 8, and transmit antenna port 4 can occupy the time-frequency point with index 4 and the time-frequency point with index 9, to send the pilot signals.

[0522] It can be understood that the time-frequency points that can be occupied by the first transmit antenna ports can sequentially cover the first time-frequency points, for example, in (a) of FIG. 10, transmit antenna port 0 can occupy the time-frequency point with index 0, transmit antenna port 1 can occupy the time-frequency point with index 1, transmit antenna port 2 can occupy the time-frequency point with index 2, transmit antenna port 3 can occupy the time-frequency point with index 3, and transmit antenna port 4 can occupy the time-frequency point with index 4; the time-frequency points that can be occupied by the first transmit antenna ports can also inversely cover the first time-frequency points, for example, transmit antenna port 0 can occupy the time-frequency point with index 4, transmit antenna port 1 can occupy the time-frequency point with index 3, transmit antenna port 2 can occupy the time-frequency point with index 2, transmit antenna port 3 can occupy the time-frequency point with index 1, and transmit antenna port 4 can occupy the time-frequency point with index 0. Unless otherwise specified, embodiments of the present application do not limit this.

[0523] It can be understood that the first time-frequency point occupied by the pilot signal can also be determined by preferentially covering the frequency domain (for example, the mapping order of frequency domain first and time domain second). For example, as shown in (a) of FIG. 10, when the number of first transmission antenna ports is 5 and the first density is 1, the time-frequency points occupied by the pilot signal sent by the first transmission antenna port are 5. In order to enable all the first transmission antenna ports to occupy time-frequency points to send the pilot signal, a subcarrier and an OFDM symbol used for sending the pilot signal are newly added. The index of the newly added subcarrier is 0, and the indexes of the newly added OFDM symbols are 0, 4 and 8. The 8 time-frequency points can be determined by using the newly added subcarrier, the newly added OFDM symbol, the subcarrier with index 5 and the OFDM symbol with index 1. The positions of the 8 time-frequency points are represented by (time domain index, frequency domain index) as follows: (0, 0), (1, 0), (4, 0), (8, 0), (0, 5), (1, 5), (4, 5) and (8, 5). In the 8 time-frequency points, the time-frequency points can be determined according to the time-frequency point determined by preferentially using the OFDM symbol with index 1 and the subcarrier with index 5, the time-frequency point determined by preferentially using the OFDM symbol with index 1 and the newly added subcarrier with index 0, and the time-frequency point determined by preferentially using the newly added OFDM symbol and the subcarrier with index 5. The time-frequency point coverage order of the time-frequency points is used to determine the time-frequency points occupied by the transmission antenna port. For example, the time-frequency points occupied by the pilot signal sent by the first transmission antenna port are in the following order: time-frequency point (1, 5), time-frequency point (1, 0), time-frequency point (0, 5), time-frequency point (4, 5) and time-frequency point (8, 5).

[0524] The communication method 1000 provided by the embodiment of the present application is described in detail above in combination with FIG. 9 and FIG. 10. The communication method 1000 can guarantee a larger spatial domain feedback dimension by preferentially compressing the time domain and / or frequency domain feedback dimension. For a narrowband system, preferentially compressing the time domain and / or frequency domain feedback dimension for channel estimation can obtain more accurate channel estimation results.

[0525] Optionally, a larger time domain and / or frequency domain feedback dimension can also be guaranteed by preferentially compressing the spatial domain feedback dimension. A possible implementation manner of preferentially compressing the spatial domain feedback dimension for channel estimation is described below in combination with FIG. 11 and FIG. 12. For a wideband system, preferentially compressing the spatial domain feedback dimension for channel estimation can obtain more accurate channel estimation results.

[0526] FIG. 11 is a schematic diagram of a communication method 300 provided by an embodiment of the present application. As shown in FIG. 11, the method 300 includes the following steps.

[0527] S310, the first device acquires the MPC of the location where the first device is located.

[0528] The MPC can include at least one of a departure angle or a departure off angle (DoD), an arrival angle (DoA), a power, a pitch angle, an azimuth angle, or a delay. The DoD refers to an angle at which a path departs from a transmitting end, including a departure angle in a horizontal direction (also referred to as an azimuth angle) and a departure angle in a vertical direction (also referred to as a pitch angle). The DoA refers to an angle at which a path arrives at a receiving end, including an arrival angle in a horizontal direction (also referred to as an azimuth angle) and an arrival angle in a vertical direction (also referred to as a pitch angle). The delay refers to a time consumed from transmission at the transmitting end to reception at the receiving end, also referred to as a time of flight.

[0529] Exemplarily, the first device can obtain the MPC based on a radio map, or the first device can obtain the MPC according to a ray tracing technique. The radio map refers to a map used to display a coverage range of a wireless signal and a distribution of signal strength, and can reflect parameter values of various position points in which the first device is located in a wireless network. It can be understood that the present application does not limit the specific implementation mode of the first device obtaining the MPC of the position of the first device, and the related description of the existing MPC obtaining can be referred to.

[0530] Optionally, the first device can further determine a feedback dimension or a second pilot pattern based on the obtained MPC. The specific implementation can be referred to the case one described in steps S320-S330 or the case two described in steps S340-S350. The case one and the case two can be executed alternatively, and are not limited.

[0531] Case one:

[0532] S320, determining a feedback dimension according to the MPC of the position of the first device.

[0533] The feedback dimension includes a spatial domain feedback dimension, and the spatial domain feedback dimension includes a transmitting antenna feedback dimension and / or a receiving antenna feedback dimension. The transmitting antenna feedback dimension is used to determine Q first transmitting antenna ports, and the receiving antenna feedback dimension is used to determine X first receiving antenna ports. The Q first transmitting antenna ports are used to transmit a reference signal, and the X first receiving antenna ports are used to receive the reference signal. Q and X are both integers greater than or equal to 1.

[0534] In the embodiment of the present application, the reference signal includes at least one of a pilot signal (for example, a CSI-RS or an SRS), a DMRS, a TRS, a PT-RS, a PRS, a SeRS, or other reference signals, and is not limited.

[0535] Optionally, the feedback dimension further comprises a time domain feedback dimension and a frequency domain feedback dimension, and the time domain feedback dimension and the frequency domain feedback dimension are used to determine K second time-frequency points, and the K second time-frequency points are used to transmit the reference signal, and K is an integer greater than or equal to 1. Alternatively, the K second time-frequency points are determined, and the channel information on the K second time-frequency points to be fed back is determined. For example, for a downlink transmission system, the network side transmits the reference signal, and the terminal side needs to transmit the channel information corresponding to the feedback dimension to the network side after completing the channel measurement and estimation according to the reference signal, and thus needs to feed back the channel information corresponding to the K second time-frequency points.

[0536] In an implementation manner, the first device determines the quantity of parameters to be acquired according to the MPC, and determines the feedback dimension according to the quantity of parameters to be acquired. For brevity, the related description of the following step S340 is not repeated here.

[0537] Optionally, if the first device and the second device use the same model and the same algorithm, the same feedback dimension can be calculated based on the same position information, and thus the following step S330 does not need to be performed. Conversely, the first device can synchronize the feedback dimension with the second device after determining the feedback dimension, so as to facilitate subsequent channel measurement. That is, the method further comprises the following step S330.

[0538] S330, the first device sends second information to the second device, and correspondingly, the second device receives the second information from the first device.

[0539] The second information indicates the feedback dimension.

[0540] Exemplarily, the feedback dimension indicated by the second information comprises K second time-frequency points, Q first transmit antenna ports and / or X first receive antenna ports, for example, 8 second time-frequency points, 5 first transmit antenna ports and / or 5 first receive antenna ports. Specifically, the second information can comprise at least one of the following: a transmit antenna feedback dimension (for example, Q first transmit antenna ports), a receive antenna feedback dimension (for example, X first receive antenna ports), a time domain feedback dimension (for example, K1 symbols), and a frequency domain feedback dimension (for example, K2 subcarriers), wherein Q, X, K, K1 and K2 are positive integers, and K1*K2=K.

[0541] Based on the above case one, the spatial feedback dimension, the time feedback dimension and the frequency feedback dimension between the first device and the second device can be synchronized, that is, the first device and the second device can determine which channel information of the time-frequency-space points needs to be fed back through the Q first transmitting antenna ports, the X first receiving antenna ports and the K second time-frequency points. The feedback dimension determined based on the MPC is lower, and the corresponding channel feedback overhead is also lower. For example, for a downlink transmission system, the network side sends a reference signal, and after the terminal side completes channel measurement and estimation based on the reference signal, it also needs to send the channel information corresponding to the feedback dimension to the network side. The feedback of the channel information based on the feedback dimension determined based on the technical solution of the present application can reduce the feedback overhead.

[0542] Case two:

[0543] S340, the first device determines a second pilot pattern according to the MPC of the location of the first device.

[0544] The second pilot pattern indicates Q first transmitting antenna ports, and the Q first transmitting antenna ports are used to transmit reference signals. It can be understood that the channel information can be obtained by measuring the reference signal, and Q is an integer greater than or equal to 1.

[0545] Optionally, the second pilot pattern further indicates P first time-frequency points, and the P first time-frequency points are used to transmit reference signals, and P is an integer greater than or equal to 1. It can be understood that the time-frequency point in the present application can refer to an RE, and one time-frequency point is one RE. Specifically, one time-frequency point can be regarded as one RE determined by one symbol and one subcarrier. Alternatively, one time-frequency point can also be regarded as one resource block (resource block, RB), and the size and form of the first time-frequency point are not limited in the present application.

[0546] In the present application, the first time-frequency point and the first transmitting antenna port satisfy: P=Q*M, wherein P is the number of first time-frequency points, Q is the number of first transmitting antenna ports, M is the first density corresponding to the first transmitting antenna port, and M is an integer greater than or equal to 1. The first density is used to indicate the number of first time-frequency points occupied by each first transmitting antenna port for transmitting reference signals.

[0547] For example, assuming Q=5, P=5, M=1, it is indicated that the second pilot pattern is used to indicate 5 first transmit antenna ports and 5 first time-frequency points, and it is indicated that each first transmit antenna port occupies one first time-frequency point, at this time, the first device can send / receive reference signals to the second device through 5 first transmit antenna ports occupying 5 first time-frequency points respectively, and each first transmit antenna port corresponds to one first time-frequency point. When M>1, for example, M=2, Q=5, P=10, it is indicated that the second pilot pattern is used to indicate 5 first transmit antenna ports and 10 first time-frequency points, and it is indicated that each first transmit antenna port occupies two first time-frequency points, at this time, the first device can send / receive reference signals to the second device through 5 first transmit antenna ports occupying 10 first time-frequency points, and each first transmit antenna port corresponds to two first time-frequency points.

[0548] As a possible implementation, the first device determines the second pilot pattern according to the MPC of the location where the first device is located, comprising: the first device determines feedback dimensions according to the MPC; determines K second time-frequency points, Q first transmit antenna ports and / or X first receive antenna ports according to the feedback dimensions; and determines the second pilot pattern according to the K second time-frequency points and the Q first transmit antenna ports.

[0549] The feedback dimensions comprise time domain feedback dimensions, frequency domain feedback dimensions and space domain feedback dimensions, and the space domain feedback dimensions comprise transmit antenna feedback dimensions and / or receive antenna feedback dimensions. It can be understood that the time-frequency domain feedback dimensions in the embodiments of the present application correspond to the K second time-frequency points, and the space domain feedback dimensions correspond to the Q first transmit antenna ports and / or the X first receive antenna ports. That is, the number of first transmit antenna ports is determined according to the transmit antenna feedback dimensions, and the number of first receive antenna ports is determined according to the receive antenna feedback dimensions. That is, the transmit antenna feedback dimensions correspond to the Q first transmit antenna ports, and the receive antenna feedback dimensions correspond to the X first receive antenna ports.

[0550] That is, the first device first determines the space domain feedback dimensions (preferentially), the time domain feedback dimensions and the frequency domain feedback dimensions according to the obtained MPC, then selects corresponding number of time-frequency points and antenna ports from the preset time-frequency resources and the preset antenna ports according to the determined feedback dimensions, and then determines the second pilot pattern according to the transmission requirements.

[0551] Next, the specific implementation of the first device determining the second pilot pattern according to the MPC of the location where the first device is located will be described by way of example.

[0552] Firstly, the first device determines the feedback dimensions according to the MPC, comprising the following implementation.

[0553] In an implementation, the first device determines the number of parameters to be acquired according to the MPC; and determines the feedback dimension according to the number of parameters to be acquired.

[0554] The number of parameters to be acquired can be a phase, wherein the phase and the MPC belong to channel information. Alternatively, the channel information is obtained by measuring the channel based on a reference signal. The specific form of the number of parameters to be acquired is not limited in the present application.

[0555] As an example, the number of parameters to be acquired N is determined according to the MPC, comprising: determining the number of paths N according to the MPC path The number of parameters to be acquired N satisfies: N = nN path n and N path are integers greater than 0. In particular, for the case that the feedback dimension is equal to the number of parameters to be acquired, it can be guaranteed that the feedback dimension is the lowest and the pilot overhead is the smallest. For example, n = 4, which means that one path corresponds to 4 parameters to be acquired, i.e., one path corresponds to 4 random phases.

[0556] It can be understood that the feedback dimension is greater than or equal to the number of parameters to be acquired.

[0557] As an example, the first device can first compress the spatial domain to obtain a spatial domain feedback dimension, for example, comprising a transmit antenna feedback dimension and a receive antenna feedback dimension; and then adjust the time domain feedback dimension and the frequency domain feedback dimension, to ensure that the compressed feedback dimension is greater than the number of parameters to be acquired N, for example Or, It can be guaranteed that the random phase corresponding to each path has a unique solution. Wherein, represents the time domain feedback dimension, represents the frequency domain feedback dimension, represents the receive antenna feedback dimension, represents the transmit antenna feedback dimension.

[0558] Alternatively, if The first device can adjust the time domain feedback dimension and the frequency domain feedback dimension, so that N. Wherein, the amount of time-frequency resources can be referred to in the adjustment process. For example, for a wideband system, the time domain can be compressed first, and For a narrowband system, the frequency domain can be compressed first, and

[0559] It should be noted that the above is an example of preferentially compressing the spatial domain and then compressing the time-frequency domain, which is mainly applicable to narrowband systems.

[0560] Exemplarily, the spatial domain feedback dimension, for example, the transmit (receive) antenna feedback dimension Any one of the following can be satisfied:

[0561] Or,

[0562] wherein N represents the number of parameters to be obtained, represents a channel matrix, represents the rank of the channel matrix, represents the eigenvalue of the channel matrix, Threshold represents a preset threshold, min() represents a minimum value function, #() represents the number, and M satisfies any one of the following: Or,

[0563] Optionally, the preset threshold Threshold can be configured or fed back in real time by a standard, a manufacturer, a high layer signaling (for example, RRC), or a device (for example, a network side or a terminal side), without any limitation.

[0564] Optionally, the channel matrix is obtained based on the MPC, the parameters to be obtained, and a time-frequency domain conversion module. Here, the parameters to be obtained can be a randomly set phase value. For example, if the MIMO system includes N1 transmitting antenna ports and N2 receiving antenna ports and the antenna array is arranged in a plane, the channel matrix may be a two-dimensional matrix of N2xN1. In the two-dimensional channel matrix, the row corresponds to the receiving antenna, the column corresponds to the transmitting antenna, and the element in the matrix can be denoted as h ij , h ij represents the channel response from the i th transmitting antenna to the j th receiving antenna. In some cases, the channel matrix can be sparse, that is, only a few elements are non-zero. This is common in a multipath environment, because the signal can only propagate through a few significant paths.

[0565] Optionally, the time-frequency domain conversion module can convert the MPC to channel state information (CSI). The time-frequency domain conversion module can be implemented by a mathematical model, a simulation model, an AI model, and the like.

[0566] That is, the first device can select the rank of the channel as the minimum value of the spatial domain feedback dimension (or the minimum value of the spatial domain compressibility), or the number of strong streams as the minimum value of the spatial domain feedback dimension (or the minimum value of the spatial domain compressibility).

[0567] For example, the first device determines the feedback dimension according to the MPC, including: the spatial domain feedback dimension is 5 first transmit antenna ports (i.e., Q=5), and the time-frequency domain feedback dimension is 8 second time-frequency points (i.e., K=8), wherein the time domain feedback dimension can be 4, the frequency domain feedback dimension can be 2, or the time domain feedback dimension can be 2, and the frequency domain feedback dimension can be 4, etc., without limitation.

[0568] Then, the first device determines K second time-frequency points, Q first transmit antenna ports, and / or X first receive antenna ports according to the feedback dimension, including the following multiple implementation manners.

[0569] In one implementation manner, the first device randomly selects K second time-frequency points from the pre-allocated time-frequency resources and randomly selects Q first transmit antenna ports and / or X first receive antenna ports from the pre-allocated antenna ports according to the feedback dimension, for example, randomly selects Q first transmit antenna ports from the pre-allocated transmit antenna ports and randomly selects X first receive antenna ports from the pre-allocated receive antenna ports, i.e., a random selection manner.

[0570] The pre-allocated time-frequency resources can be system time-frequency resources, which can also be referred to as original time-frequency resources. The pre-allocated time-frequency resources can be a resource set, including one or more time-frequency points; the pre-allocated antenna ports can be system antenna ports, which can be an antenna port set or an antenna port group, including one or more antenna ports.

[0571] Further, the first device can send second information to the second device, the second information indicating the feedback dimension, the feedback dimension including K second time-frequency points, Q first transmit antenna ports, and / or X first receive antenna ports. That is, the first device and the second device can realize synchronization of K second time-frequency points, Q first transmit antenna ports, and / or X first receive antenna ports through interaction of the second information, and thus determine the channel information on the K second time-frequency points to be fed back when feeding back the channel. For example, for a downlink transmission system, the network side sends a reference signal, and after the terminal side completes channel measurement and estimation according to the reference signal, it also needs to send the channel information corresponding to the feedback dimension to the network side, and thus needs to feed back the channel information corresponding to the K second time-frequency points.

[0572] For example, when indicating K second time-frequency points, Q first transmit antenna ports, and / or X first receive antenna ports, the first device can encode according to the pre-allocated time-frequency resources and the pre-allocated antenna ports, and synchronize the position encoding of the selected time-frequency points and antenna ports. For example, if Encode according to the pre-allocated antenna ports, and synchronize the position encoding of the selected first transmit antenna ports and first receive antenna ports. If The second time-frequency points, the first transmitting antenna ports and the first receiving antenna ports are synchronously selected and encoded according to the pre-allocated time-frequency resources.

[0573] Optionally, considering the channel change, such as terminal position change, or antenna configuration change, the time domain feedback dimension, the frequency domain feedback dimension and the space domain feedback dimension can change, at this time, the first device can determine the time domain feedback dimension, the frequency domain feedback dimension and the space domain feedback dimension by using the independent selection mode or the nested selection mode.

[0574] The independent selection mode refers to that in different time periods, a corresponding number of time-frequency points (for example, K second time-frequency points) and antenna ports (for example, Q first transmitting antenna ports and / or X first receiving antenna ports) are independently selected according to the feedback dimensions, and the positions of the synchronously selected time-frequency points and antenna ports are encoded. The nested selection mode refers to that in different time periods, the time-frequency points and antenna ports selected at the previous moment are multiplexed.

[0575] For example, if The selection of the second time-frequency points corresponding to the time domain feedback dimension and the frequency domain feedback dimension is unchanged, and the antenna ports of the space domain feedback dimension are preferentially multiplexed with the antenna ports selected at the previous moment. For example, taking the receiving antenna port as an example, if the T+1 moment is greater than the T moment , the receiving antenna ports selected at the T moment can be multiplexed, and the receiving antenna ports are randomly selected from the unused receiving antenna ports, at this time, only the position encoding of the new receiving antenna ports needs to be synchronized; if the T+1 moment is less than or equal to the T moment , the first receiving antenna ports selected at the T moment can be pre-configured to be multiplexed, or the last receiving antenna ports selected at the T moment can be pre-configured to be multiplexed, or the receiving antenna ports selected at the previous moment are uniformly sampled. For example, taking the transmitting antenna port as an example, if the T+1 moment is greater than the T moment , the transmitting antenna ports selected at the T moment can be multiplexed, and the transmitting antenna ports are randomly selected from the unused transmitting antenna ports, at this time, only the position encoding of the new transmitting antenna ports needs to be synchronized; if the T+1 moment is less than or equal to the T moment , the first transmitting antenna ports selected at the T moment can be pre-configured to be multiplexed, or the last one transmit antenna port, or, uniformly sampling from the transmit antenna ports selected at the last time instant one transmit antenna port.

[0576] For example, if The selection of the second time-frequency point corresponding to the time-domain feedback dimension and the frequency-domain feedback dimension can change. The time-domain feedback dimension and the frequency-domain feedback dimension preferentially multiplex the time-frequency point selected at the last time instant, and the spatial-domain feedback dimension preferentially multiplexes the antenna port selected at the last time instant. The configuration and signaling of the specific multiplexing mode are as described above, and will not be described again here.

[0577] Optionally, the specific multiplexing mode can be configured or preconfigured by a standard, a manufacturer, or high-layer signaling (for example, RRC). Optionally, the multiplexing mode can also be configured in real time by the network side. For example, using two bits to identify the receive antenna port, assuming that "00" represents the receive antenna port before multiplexing one receive antenna port, "01" represents the receive antenna port after multiplexing one receive antenna port, "10" represents uniformly sampling from the receive antenna port selected at the last time instant one receive antenna port, at which time the first device indicates the sampling interval and the sampling starting point to the second device, and synchronizes or the position encoding.

[0578] In summary, in the random selection mode, the first device can send third information to the second device, the third information being used to indicate that, in the case that the feedback dimensions corresponding to different time instants are different, the K second time-frequency points, the Q first transmit antenna ports, and / or the X first receive antenna ports are determined by using the independent selection mode or the nested selection mode. It should be noted that when the nested selection mode is used, the third information includes multiplexing indication information, which is used to indicate the number and positions of the second time-frequency points, the first transmit antenna ports, and the first receive antenna ports that are multiplexed.

[0579] In another implementation mode, the first device selects, according to the feedback dimension, the K second time-frequency points at equal intervals from the pre-allocated time-frequency resources, and uniformly selects the Q first transmit antenna ports and / or the X first receive antenna ports from the pre-allocated antenna ports, for example, uniformly selecting the Q first transmit antenna ports from the pre-allocated transmit antenna ports, and uniformly selecting the X first receive antenna ports from the pre-allocated receive antenna ports, that is, the uniformly selected mode.

[0580] The pre-allocated time-frequency resource can be a system time-frequency resource. The pre-allocated time-frequency resource can be a resource set, including one or more time-frequency points; the pre-allocated antenna port can be a system antenna port, and can be an antenna port set or an antenna port group, including one or more antenna ports.

[0581] Exemplarily, the first device can select a corresponding number of time-frequency points (for example, K second time-frequency points) and antenna ports (for example, Q first transmission antenna ports and / or X first reception antenna ports) from the pre-allocated time-frequency resource and the pre-allocated antenna port according to a sampling interval.

[0582] Optionally, the sampling interval and the sampling starting point can be preconfigured by a standard, a manufacturer, or high-layer signaling (for example, RRC); or a set of sampling intervals and a set of sampling starting points can also be preconfigured by a standard, a manufacturer, or high-layer signaling (for example, RRC), wherein the set of sampling intervals includes the sampling interval, and the set of sampling starting points includes the sampling starting point.

[0583] Further, the first device can send second information to the second device, the second information indicating a feedback dimension, the feedback dimension including the K second time-frequency points, the Q first transmission antenna ports, and / or the X first reception antenna ports. That is, the first device and the second device can achieve synchronization of the K second time-frequency points, the Q first transmission antenna ports, and / or the X first reception antenna ports by interacting the second information, so as to enable correct feedback of the channel measurement result by the receiving end (that is, the end receiving the reference signal). By synchronizing the sparse feedback dimension, signaling overhead, calculation overhead, and feedback overhead can be reduced.

[0584] Exemplarily, when the K second time-frequency points, the Q first transmission antenna ports, and / or the X first reception antenna ports are indicated, the first device can encode the position codes of the selected time-frequency points and antenna ports according to the pre-allocated time-frequency resource and the pre-allocated antenna port. For example, if Only the spatial domain feedback dimension needs to be synchronized, that is, the position codes of the selected Q first transmission antenna ports and / or X first reception antenna ports need to be synchronized. If The time domain feedback dimension, the frequency domain feedback dimension, and the spatial domain feedback dimension need to be synchronized, that is, the position codes of the selected second time-frequency points, first transmission antenna ports, and first reception antenna ports need to be synchronized.

[0585] Optionally, considering the case of channel change, for example, terminal position change, or antenna configuration change, the time domain feedback dimension, the frequency domain feedback dimension, and the spatial domain feedback dimension can change, at which time the first device can determine the time domain feedback dimension, the frequency domain feedback dimension, and the spatial domain feedback dimension in an equal interval mode or a variable interval mode.

[0586] wherein, the equal interval mode refers to that the sampling intervals used in different time periods are the same, and there is no need to synchronize the sampling intervals in each time interval. The variable interval mode refers to that the sampling intervals used in different time periods are different, and there is a need to synchronize the sampling intervals in each time interval.

[0587] Optionally, the specific equal interval mode or variable interval mode can be configured or preconfigured by a standard, a manufacturer, or high layer signaling (e.g., RRC).

[0588] Optionally, the different time periods can adopt an independent selection mode or a nested selection mode to determine the time domain feedback dimension, the frequency domain feedback dimension, and the space domain feedback dimension, and the specific implementation manner is as described above, and for brevity, will not be described here.

[0589] In summary, in the uniform selection mode, the first device can send fourth information to the second device, the fourth information being used to indicate that in the case that the feedback dimensions corresponding to different time instants are different, the equal interval mode or the variable interval mode is adopted to determine the K second time-frequency points, the Q first transmission antenna ports, and / or the X first reception antenna ports. It should be noted that when the variable interval mode is adopted to determine the K second time-frequency points, the Q first transmission antenna ports, and / or the X first reception antenna ports, the fourth information includes the sampling intervals (or the sampling interval set) and the sampling starting point corresponding to different time instants, and the independent selection mode or the nested selection mode (multiplexing indication information) adopted at different time instants. That is, when the equal interval mode is adopted to determine the K second time-frequency points, the Q first transmission antenna ports, and / or the X first reception antenna ports, there is no need to repeatedly synchronize the sampling intervals and the sampling starting point between the first device and the second device.

[0590] In yet another implementation manner, the first device selects the K second time-frequency points from a preset time-frequency point set, and selects the Q first transmission antenna ports and / or the X first reception antenna ports from a preset antenna port set according to the feedback dimension, for example, selects the Q first transmission antenna ports from a preset transmission antenna port set, and selects the X first reception antenna ports from a preset reception antenna port set, that is, a selection manner from a preset set.

[0591] wherein, the preset time-frequency point set can be a system time-frequency resource. The preset time-frequency point set can be a time-frequency resource set, including one or more time-frequency points; the preset antenna port set can be a system antenna port, and can be an antenna port set or an antenna port group, the antenna port set or the antenna port group including one or more antenna ports.

[0592] Further, the first device can send second information to the second device, the second information indicating the feedback dimension, the feedback dimension including the K second time-frequency points, the Q first transmit antenna ports and / or the X first receive antenna ports. That is, the first device and the second device can achieve synchronization of the K second time-frequency points, the Q first transmit antenna ports and / or the X first receive antenna ports through interaction of the second information, and correct feedback of the receiving end (i.e., the end receiving the reference signal) to the channel measurement result can be achieved. Through synchronization of the sparse feedback dimension, signaling overhead, computation overhead and feedback overhead can be reduced.

[0593] Optionally, a corresponding number of time-frequency point or antenna port sets can be configured for different numbers of time-domain feedback dimensions, frequency-domain feedback dimensions or spatial-domain feedback dimensions, which can be configured or preconfigured by standards, manufacturers or high-layer signaling (e.g., RRC).

[0594] Exemplarily, when the K second time-frequency points are indicated, the first device can synchronize the time-domain feedback dimension and the frequency-domain feedback dimension, or preconfigure a set identity (ID). As shown in Table 3, different time-frequency feedback dimension sets correspond to different numbers of time-frequency points and different time-frequency point IDs. For example, if the first device determines that the time-frequency feedback dimension is 4, according to Table 3, the time-frequency feedback dimension set 2 can be selected, indicating that the time-frequency point IDs synchronized with the time-frequency feedback dimension include RE0, RE1, RE2 and RE3 (i.e., P = 4 first time-frequency points); for another example, if the first device determines that the time-frequency feedback dimension is 2, according to Table 3, the time-frequency feedback dimension set 1 can be selected, indicating that the time-frequency point IDs synchronized with the time-frequency feedback dimension include RE0 and RE1 (i.e., P = 2 first time-frequency points), achieving synchronization of the time-frequency points of the transmitting end and the receiving end.

[0595] Optionally, if the first device determines that the time-frequency feedback dimension is 3, according to Table 3, the time-frequency feedback dimension set 2 can be selected, indicating that the time-frequency point IDs synchronized with the time-frequency feedback dimension include any three of RE0, RE1, RE2 or RE3 (i.e., P = 3 first time-frequency points).

[0596] Exemplarily, when indicating X first receiving antenna ports, the first device can synchronize receiving antenna feedback dimension, or preconfigured set ID. As an example of receiving antenna port feedback dimension shown in Table 1, different receiving antenna port sets correspond to different receiving antenna port numbers, and also correspond to different receiving port IDs. For example, if the first device determines that the receiving antenna port feedback dimension is 2, according to the above Table 1, the receiving antenna port set 1 can be selected, indicating that the two synchronized receiving port IDs include TR0 and TR1 (i.e., X = 2 first receiving antenna ports); for another example, if the first device determines that the receiving antenna port feedback dimension is 4, according to the above Table 1, the receiving antenna port set 2 can be selected, indicating that the two synchronized receiving port IDs include TR0, TR1, TR2 and TR3 (i.e., X = 4 first receiving antenna ports), realizing the synchronization of the antenna ports of the transmitting end and the receiving end.

[0597] Optionally, if the first device determines that the receiving antenna port feedback dimension is 3, according to the above Table 1, the receiving antenna port set 2 can be selected, indicating that the two synchronized receiving port IDs include any three of TR0, TR1, TR2 or TR3 (i.e., X = 3 first receiving antenna ports).

[0598] Exemplarily, when indicating Q first transmitting antenna ports, the first device can synchronize transmitting antenna feedback dimension, or preconfigured set ID. As an example of transmitting antenna port feedback dimension shown in Table 2, different transmitting antenna port sets correspond to different transmitting antenna port numbers, and also correspond to different transmitting port IDs. For example, if the first device determines that the receiving transmitting port feedback dimension is 2, according to the above Table 2, the transmitting antenna port set 1 can be selected, indicating that the two synchronized transmitting port IDs include TX a and TX b (i.e., Q = 2 first transmitting antenna ports); for another example, if the first device determines that the transmitting antenna port feedback dimension is 4, according to the above Table 2, the transmitting antenna port set 2 can be selected, indicating that the two synchronized transmitting port IDs include TX a , TX b , TX c and TX d (i.e., Q = 4 first transmitting antenna ports), realizing the synchronization of the antenna ports of the transmitting end and the receiving end.

[0599] Optionally, if the first device determines that the transmitting antenna port feedback dimension is 3, according to the above Table 2, the transmitting antenna port set 2 can be selected, indicating that the two synchronized transmitting port IDs include TX a , TX b , TX c or TX d (i.e., Q = 3 first transmitting antenna ports).

[0600] It can be understood that the above Table 1 to Table 3 are only examples given for the convenience of understanding, and other schemes are not excluded. Alternatively, the transmit antenna port feedback dimension (see Table 2) and the receive antenna port feedback dimension (see Table 1) can share one table, which is not limited. Alternatively, it can also be implemented by corresponding codes, functions, texts, strings or other means that can be used to indicate relevant information (for example, time domain feedback dimension, frequency domain feedback dimension or space domain feedback dimension), and the specific implementation manner is not limited by the present application.

[0601] Finally, the first device determines the second pilot pattern according to the K second time-frequency points and the Q first transmit antenna ports.

[0602] In an implementation manner, the first device determines the second pilot pattern according to the K second time-frequency points, the Q first transmit antenna ports and the first density, that is, determines the P first time-frequency points and the Q first transmit antenna ports. The P first time-frequency points correspond to the Q first transmit antenna ports.

[0603] Exemplarily, the first time-frequency points and the first transmit antenna ports satisfy: P=Q*M, where P is the number of the first time-frequency points, Q is the number of the first transmit antenna ports, M is the first density corresponding to the first transmit antenna ports, and M is an integer greater than or equal to 1.

[0604] Alternatively, the P first time-frequency points belong to the K second time-frequency points, K is an integer greater than or equal to P, which means that the K second time-frequency points in the feedback dimension determined by the first device are sufficient to support (or meet) the transmission requirement of the reference signal; or the P first time-frequency points include the K second time-frequency points, P is an integer greater than K, P=N'+K, N' is an integer greater than or equal to 1, which means that the K second time-frequency points in the feedback dimension determined by the first device are insufficient to support (or do not meet) the transmission requirement of the reference signal, and N' third time-frequency points need to be added. Alternatively, the N' third time-frequency points belong to the pre-allocated time-frequency resources or the preset time-frequency point set, that is, the N' third time-frequency points can be randomly selected or uniformly selected from the pre-allocated time-frequency resources, or the N' third time-frequency points can be determined from the preset time-frequency point set, which is not limited.

[0605] The above implementation manner of the first device determining the second pilot pattern according to the MPC of the location of the first device is only an implementation manner given for the convenience of understanding, and other schemes are not excluded, as long as the second pilot pattern is determined based on the MPC, which belongs to the protection scope of the present application.

[0606] Optionally, if the first device and the second device use the same model and the same algorithm, the same second pilot pattern can be calculated based on the same location information, in which case the following step S350 need not be performed; conversely, after determining the second pilot pattern, the first device can synchronize the second pilot pattern with the second device, facilitating subsequent channel measurement, i.e., the method further includes the following step S350.

[0607] S350, the first device sends first information to the second device, and correspondingly, the second device receives the first information from the first device.

[0608] The first information indicates the second pilot pattern.

[0609] Exemplarily, the first information can include at least one of the following: a first density, a first order, fifth indication information, time-frequency positions of the N' third time-frequency points, or sixth indication information, and the specific meanings are shown as follows.

[0610] (1) The first density is used to indicate the number of first time-frequency points occupied by the reference signal transmitted by each first transmission antenna port.

[0611] For example, when the first density M = 1, it means that one first time-frequency point is occupied by the reference signal transmitted by each first transmission antenna port, i.e., one first transmission antenna port corresponds to one first time-frequency point, which can be understood as that the first device sends the reference signal on one time-frequency point through one antenna port; for another example, when the first density M > 1, such as M = 2, Q = 5, and P = 10, it means that two first time-frequency points are occupied by the reference signal transmitted by each first transmission antenna port, i.e., each first transmission antenna port corresponds to two first time-frequency points, which can be understood as that the first device sends the reference signal on two time-frequency points through one antenna port.

[0612] (2) The first order is used to indicate that the reference signal is configured on the K second time-frequency points in the order of time domain first and frequency domain second or the order of frequency domain first and time domain second.

[0613] That is, for the P first time-frequency points and the Q first transmission antenna ports indicated by the second pilot pattern, the first order can be used to determine whether the time domain feedback dimension or the frequency domain feedback dimension is preferentially covered. As an example, a frequency domain priority mode and a time domain priority mode are included. The frequency domain priority mode means that the reference signal preferentially covers the frequency domain feedback dimension, and the time domain priority mode means that the reference signal preferentially covers the time domain feedback dimension.

[0614] Optionally, for a wideband system, the frequency domain first mode can be preferred; for a narrowband system, the time domain first mode can be preferred. This is because: in a wideband system with a wide bandwidth, the channel characteristics between different frequency points can differ greatly, and the reference signal first covers the frequency domain to achieve more coverage of the bandwidth; in a narrowband system with a narrow bandwidth, the channel characteristics between different frequency points can differ less, and preferentially covering the frequency domain can lead to redundancy of the measurement, and the result of the channel measurement is not comprehensive. For a wideband system with a wide bandwidth of the signal, the result of the channel estimation obtained by a larger time domain feedback dimension and a frequency domain feedback dimension can more accurately reflect the state of the channel. Therefore, for a wideband system, the mapping order of first frequency domain and then time domain can be preferred. For a narrowband system, the mapping order of first time domain and then frequency domain can be preferred.

[0615] For example, the size of the first order can be 1 bit, or indicated by 1 bit, for example, "1" can represent the order of first time domain and then frequency domain, or in other words, the time domain first mode; "0" can represent the order of first frequency domain and then time domain, or in other words, the frequency domain first mode; or vice versa, for example, "0" can represent the order of first time domain and then frequency domain, or in other words, the time domain first mode; "1" can represent the order of first frequency domain and then time domain, or in other words, the frequency domain first mode. The size and form of the first order are not limited in the present application.

[0616] (3) The fifth indication information is used to indicate adding N' third time-frequency points.

[0617] In other words, the fifth indication information is used to indicate that the K second time-frequency points in the feedback dimension determined by the first device in step S320 are insufficient to support (or do not meet) the transmission requirement of the reference signal, and therefore N' third time-frequency points are additionally indicated by the fifth indication information. Optionally, the N' third time-frequency points can be selected from the pre-allocated time-frequency resources or the preset time-frequency point set, that is, the N' third time-frequency points belong to the pre-allocated time-frequency resources or the preset time-frequency point set. The N' third time-frequency points are different from the K second time-frequency points. It can be understood that the N' third time-frequency points and the K second time-frequency points belong to the P first time-frequency points, for example, N' + K = P.

[0618] This is because the above scheme considers that the spatial domain compression is given priority, and the spatial domain feedback dimension is usually greater than the transmission antenna feedback dimension * the first density. As an example, when the P first time-frequency points belong to the K second time-frequency points, K is an integer greater than or equal to P, it indicates that the K second time-frequency points in the feedback dimension determined by the first device in step S320 are sufficient to support (or meet) the transmission requirement of the reference signal, and therefore it is not necessary to add N' third time-frequency points. For example, the feedback dimension is 8, the transmission antenna feedback dimension is 5, and the first density is 1; or the feedback dimension is 12, the transmission antenna feedback dimension is 5, and the first density is 2.

[0619] Optionally, if the feedback dimension is less than the transmit antenna feedback dimension * the first density, as an example, the P first time-frequency points include K second time-frequency points and N' third time-frequency points, it is indicated that the K second time-frequency points in the feedback dimension determined by the first device in step S320 are insufficient to support (or do not meet) the transmission requirement of the reference signal, and therefore N' third time-frequency points are additionally added. For example, the feedback dimension is 8, the transmit antenna feedback dimension is 5, and the first density is 2, at this time, N' = 2 third time-frequency points need to be added for the placement of the reference signal. It should be pointed out that for the case of adding third time-frequency points, the time domain first mode or the frequency domain first mode indicated by the first order can still be used to cover the time-frequency domain feedback dimension.

[0620] (4) The time-frequency positions of the N' third time-frequency points.

[0621] Exemplarily, when indicating the time-frequency positions of the N' third time-frequency points, the added frequency domain / time domain ID (for example, the frequency domain includes subcarriers 1 and 5, and the time domain includes symbols 3 and 6, and then N' = 4 third time-frequency points are determined), or the added frequency domain / time domain sampling number, sampling interval, or sampling starting point (default 0) (for example, the frequency domain sampling number is 2, the time domain sampling number is 3, the sampling starting point is 0, the time domain sampling interval is 2 symbols, and the frequency domain sampling interval is 3 subcarriers, then N' = 6 third time-frequency points can be determined, specifically, the time domain includes symbols 0, 2 and 4, and the frequency domain includes subcarriers 0 and 3), or the added frequency domain / time domain set ID (for example, see Table 2, when the receive antenna port feedback dimension is determined to be 2, the receive antenna port set 1 and the corresponding receive port ID {TR0, TR1} can be determined) and the like can be returned, without limitation. For example, assuming N' = 4, the time domain adds symbols 0 and 2, and the frequency domain adds subcarriers 2 and 4, and the time-frequency domain sampling interval is 2, wherein the time domain sampling starting point is 0, and the frequency domain sampling starting point is 2, and then the second device can determine 4 third time-frequency points. Compared with returning all added frequency domain / time domain IDs, returning added frequency domain / time domain sampling number, sampling interval, or sampling starting point (default 0), or returning added frequency domain / time domain set ID can reduce signaling overhead.

[0622] (5) The sixth indication information is used to indicate that the reference signal is transmitted in the order or reverse order in the time domain and / or the frequency domain.

[0623] That is, for the P first time-frequency points and the Q first transmit antenna ports indicated by the second pilot pattern, the sixth indication information is used to determine whether the time-frequency domain feedback dimension is covered in sequence or in reverse sequence. For example, if P=3 first time-frequency points are determined by indicating symbol 0, symbol 2 and symbol 4, and subcarrier 2, and the time-frequency domain feedback dimension is covered in sequence, symbol 0, symbol 2 and symbol 4 are sequentially configured to the first transmit antenna port to transmit the reference signal; otherwise, if the time-frequency domain feedback dimension is covered in reverse sequence, symbol 4, symbol 2 and symbol 0 are sequentially configured to the first transmit antenna port to transmit the reference signal.

[0624] For example, the size of the sixth indication information can be 2 bits, or 2 bits are used for indication, for example, "00" can represent that the reference signal is configured to the first transmit antenna port in the sequence in the time domain and the frequency domain; "01" can represent that the reference signal is configured to the first transmit antenna port in the sequence in the time domain and in the reverse sequence in the frequency domain; "10" can represent that the reference signal is configured to the first transmit antenna port in the reverse sequence in the time domain and in the sequence in the frequency domain; and "11" can represent that the reference signal is configured to the first transmit antenna port in the reverse sequence in the time domain and the frequency domain. Alternatively, the size of the sixth indication information can also be 3 bits, or 3 bits are used for indication, for example, "000" can represent that the reference signal is transmitted in the sequence in the time domain; "001" can represent that the reference signal is transmitted in the reverse sequence in the time domain; "010" can represent that the reference signal is transmitted in the sequence in the frequency domain; "011" can represent that the reference signal is transmitted in the reverse sequence in the frequency domain; "100" can represent that the reference signal is transmitted in the sequence in the time domain and the frequency domain; "101" can represent that the reference signal is transmitted in the reverse sequence in the time domain and the frequency domain; "110" can represent that the reference signal is transmitted in the sequence in the time domain and in the reverse sequence in the frequency domain; and "111" can represent that the reference signal is transmitted in the reverse sequence in the time domain and in the sequence in the frequency domain; the size and form of the sixth indication information are not limited in the application.

[0625] Alternatively, at least one of the first density, the first order, the fifth indication information, the time-frequency position of the N' third time-frequency points, or the sixth indication information can also be transmitted by the second information, and the second information is different from the first information. Whether the first density, the first order, the fifth indication information, the time-frequency position of the N' third time-frequency points, or the sixth indication information is transmitted by one information is not limited in the application.

[0626] Based on the above case two, the second pilot pattern between the first device and the second device can be synchronized, or the configuration of the reference signal can be synchronized, that is, the first device and the second device can send the reference signal on the determined first time-frequency point and the first transmission antenna port, and complete the signal measurement and channel estimation. Through sparse measurement reference signal, the calculation complexity and the overhead of channel measurement can be reduced, and effective channel measurement and estimation can be provided.

[0627] Next, the second pilot pattern determined by the first device will be illustrated by combining with FIG. 12.

[0628] FIG. 12 is a schematic diagram of another pilot pattern suitable for the embodiments of the present application. Taking the reference signal as the pilot signal as an example for illustration. As shown in FIG. 12, the horizontal coordinate represents the time domain (for example, one time slot, including 14 symbols, such as symbol 0 to symbol 13), and the vertical coordinate represents the frequency domain (for example, one RB, including 12 subcarriers, such as subcarrier 0 to subcarrier 11). It can be understood that each square in the figure represents one RE (or one time-frequency point).

[0629] As shown in (a) of FIG. 12, the blank arrows corresponding to symbol 1, symbol 2, symbol 8 and symbol 11 can be regarded as the time domain feedback dimension, and subcarrier 5 and subcarrier 9 can be regarded as the frequency domain feedback dimension, and then K=8 second time-frequency points can be determined. Assuming that Q=5 first ports and the first density M=1, P=Q*M=5 first time-frequency points can be determined, for example, port 0 to port 4. Since P is less than K, no new third time-frequency point is added, that is, N'=0. Since M=1, each antenna port corresponds to one time-frequency point. Therefore, the first device can configure the pilot signal for the first transmission antenna port in the time domain and frequency domain order (the sixth indication information) according to the frequency domain first mode (the first order), for example, mapping the pilot signal in the order of 0 to 4.

[0630] As shown in (b) of FIG. 12, the blank arrows corresponding to symbol 1, symbol 2, symbol 8 and symbol 11 can be regarded as the time domain feedback dimension, and subcarrier 5 and subcarrier 9 can be regarded as the frequency domain feedback dimension, and then K=8 second time-frequency points can be determined. Assuming that Q=5 first ports and the first density M=1, P=Q*M=5 first time-frequency points can be determined, for example, port 0 to port 4. Since P is less than K, no new third time-frequency point is added, that is, N'=0. Since M=1, each antenna port corresponds to one time-frequency point. Therefore, the first device can configure the pilot signal for the first transmission antenna port in the time domain and frequency domain order (the sixth indication information) according to the frequency domain first mode (the first order), for example, mapping the pilot signal in the order of 0 to 4.

[0631] As shown in (c) of FIG. 12, the blank arrow corresponds to symbol 1, symbol 2, symbol 8 and symbol 11, which can be regarded as time domain feedback dimensions, and subcarrier 5 and subcarrier 9 can be regarded as frequency domain feedback dimensions, and then K=8 second time-frequency points can be determined. Assuming that Q=5 first ports and the first density M=2, P=Q*M=10 first time-frequency points can be determined. Since P is greater than K, N' third time-frequency points are added, for example, N'=2 (for example, two second time-frequency points determined by symbol 5 and its corresponding subcarrier 5 and subcarrier 9). Since M=2, two time-frequency points correspond to each antenna port. Therefore, the first device can cover the pilot signal in the time domain and frequency domain order (the sixth indication information) in the frequency domain priority mode (the first order), for example, the pilot signal is mapped twice in the order of 0 to 4. It should be pointed out that the feedback dimensions configured to be preferentially covered are K second time-frequency points and Q first transmitting antenna ports, and the pilot signal is further covered on the added N' third time-frequency points. When the pilot signal is covered on the added N' third time-frequency points, the pilot signal can still be covered in the time domain and frequency domain order in the frequency domain priority mode.

[0632] As shown in (d) of FIG. 12, the blank arrow corresponds to symbol 1, symbol 2, symbol 8 and symbol 11, which can be regarded as time domain feedback dimensions, and subcarrier 5 and subcarrier 9 can be regarded as frequency domain feedback dimensions, and then K=8 second time-frequency points can be determined. Assuming that Q=5 first ports and the first density M=2, P=Q*M=10 first time-frequency points can be determined. Since P is greater than K, N' third time-frequency points are added, for example, N'=4 (for example, four second time-frequency points determined by subcarrier 0 and its corresponding symbol 1, symbol 2, symbol 8 and symbol 11). Since M=2, two time-frequency points correspond to each antenna port. Therefore, the first device can cover the pilot signal in the time domain and frequency domain order (the sixth indication information) in the time domain priority mode (the first order), for example, the pilot signal is mapped twice in the order of 0 to 4. It should be pointed out that the feedback dimensions configured to ...

Claims

A communication method applied to a first device, characterized in that, The method comprises: determining a multipath element (MPC) of a location of the first device; determining a first pilot pattern according to the MPC, the first pilot pattern being used to indicate a first time-frequency point, the first time-frequency point being used to transmit a reference signal. According to the method of claim 1, wherein the first pilot pattern is also used to indicate a first transmit antenna port, the first transmit antenna port being used to transmit the reference signal. The method according to claim 2, characterized in that The method of claim 1, wherein determining the first pilot pattern according to the MPC comprises: According to the MPC, the number N of parameters to be acquired is determined, wherein the N satisfies: N=n*N path , wherein the N path represents the number of diameters determined according to the MPC, and the n is an integer greater than 0. determining a number of the first time-frequency points and a spatial domain compression indication according to the N, the spatial domain compression indication being used to indicate whether all of the transmit antenna ports are used to transmit the reference signal and whether all of the receive antenna ports are used to receive the reference signal; determining a number of the first transmit antenna ports according to the N, the number of the first time-frequency points and the spatial domain compression indication. The method according to claim 3, characterized in that The method of claim 1, wherein determining the number of the first time-frequency points and the spatial domain compression indication according to the N comprises: determining a number of second time-frequency points according to the N; determining the number of the first time-frequency points and the spatial domain compression indication according to the number of the second time-frequency points, a number of the first transmit antenna ports and a first density, the first density representing a number of time-frequency points occupied by the reference signal transmitted by each of the first transmit antenna ports; wherein the number of the first time-frequency points is greater than or equal to the number of the second time-frequency points, or the number of the first time-frequency points is less than the number of the second time-frequency points. The method according to any one of claims 1 to 4, characterized in that The method further comprises: transmitting first indication information, the first indication information being used to indicate the first pilot pattern, the first indication information comprising at least one of the following: a first density; time-frequency domain priority indication information; time-frequency domain and / or spatial domain ordering indication information. According to the method of claim 5, wherein when the number of the first time-frequency points is greater than the number of the second time-frequency points, the first time-frequency points further comprise third time-frequency points, and the first indication information further indicates positions of the third time-frequency points. The method according to any one of claims 1 to 6, characterized in that Before the step of determining the first pilot pattern according to the MPC, the method further comprises: randomly selecting the second time-frequency points from pre-allocated time-frequency resources and randomly selecting the first transmit antenna ports and the first receive antenna ports from pre-allocated antenna ports according to feedback dimensions; or equidistantly selecting the second time-frequency points from pre-allocated time-frequency resources and equidistantly selecting the first transmit antenna ports and the first receive antenna ports from pre-allocated antenna ports according to feedback dimensions; or selecting the second time-frequency points from a pre-set time-frequency point set and selecting the first transmit antenna ports and the first receive antenna ports from a pre-set antenna port set according to feedback dimensions. A communication method applied to a first device, characterized in that, The method comprises: determining a multipath element (MPC) of a location of the first device; determining a feedback dimension according to the MPC, the feedback dimension comprising a time domain feedback dimension and a frequency domain feedback dimension, the time domain feedback dimension and the frequency domain feedback dimension being used to determine second time-frequency points, the second time-frequency points being used to feed back channel information. According to the method of claim 8, wherein The feedback dimension further comprises a spatial domain feedback dimension, the spatial domain feedback dimension comprising a transmit antenna feedback dimension and a receive antenna feedback dimension, the transmit antenna feedback dimension being used to determine a first transmit antenna port, the receive antenna feedback dimension being used to determine a first receive antenna port, the first transmit antenna port being used to transmit the reference signal, the first receive antenna port being used to receive the reference signal. The method of claim 9, wherein The feedback dimension is determined according to the MPC, comprising: According to the MPC, the number N of parameters to be acquired is determined, wherein the N satisfies: N=n*N path , wherein the N path represents the number of diameters determined according to the MPC, and the n is an integer greater than 0. The second time-frequency point and a spatial domain compression indication are determined according to the N, the spatial domain compression indication being used to indicate whether all transmit antenna ports are used to transmit the reference signal and whether all receive antenna ports are used to receive the reference signal; The number of first transmit antenna ports and the number of first receive antenna ports are determined according to the N, the second time-frequency point and the spatial domain compression indication. The method according to any one of claims 8 to 10, characterized in that The method further comprises: Second indication information is transmitted, the second indication information indicating the feedback dimension. A communication device characterized by comprising: comprising: A processor is configured to execute computer instructions stored in a memory, so that the apparatus executes the method in any one of claims 1 to 7, or the method in any one of claims 8 to 11. The apparatus of claim 12, wherein The apparatus is a chip or a chip system. A computer program product, characterized in that When the computer program in the computer program product is executed by a communication apparatus, the method in any one of claims 1 to 7, or the method in any one of claims 8 to 11 is implemented. A computer-readable storage medium, characterized by The storage medium stores a computer program or instructions, when the computer program or instructions are executed by a communication apparatus, the method in any one of claims 1 to 7, or the method in any one of claims 8 to 11 is implemented.

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