WO2024067648A1

WO2024067648A1 - Communication method and related product

Info

Publication number: WO2024067648A1
Application number: PCT/CN2023/121793
Authority: WO
Inventors: 胡辰; 刘显达; 蔡世杰; 刘鹍鹏
Original assignee: 华为技术有限公司
Priority date: 2022-09-30
Filing date: 2023-09-26
Publication date: 2024-04-04
Also published as: CN117856979A

Abstract

The present application relates to the technical field of communications. Disclosed are a communication method and a related product. The method comprises: respectively receiving downlink reference signals at a first moment and a second moment on the basis of at least one first port set, wherein the first port set comprises one or more antenna ports; and sending feedback information, wherein the feedback information is used for indicating a plurality of phase difference feedback quantities; each phase difference feedback quantity corresponds to one of the at least one first port set; and the phase difference feedback quantities are used for indicating phase difference information between downlink reference signals, which are received by the antenna ports in the corresponding first port set at the first moment and the second moment. The method provided in the present application can improve the performance of channel prediction.

Description

Communication methods and related products

This application claims the priority of the Chinese patent application filed with the China Patent Office on September 30, 2022, with application number 202211215713.0 and application name “Communication Methods and Related Products”, all contents of which are incorporated by reference in this application.

Technical Field

The present application relates to the field of communication technology, and in particular to a communication method and related products.

Background technique

In a time-division duplex (TDD) massive multiple-input multiple-output (mMIMO) system, network devices need to obtain downlink channel state information (CSI) to calculate the weight of downlink data transmission to achieve high-speed downlink data transmission.

Currently, network equipment can estimate the uplink CSI by measuring the sounding reference signal (SRS) sent by the terminal device, and obtain the downlink CSI at the same time based on the channel reciprocity of TDD mMIMO. When the terminal device moves at a fast speed, CSI aging problem will occur. CSI aging refers to the change of the channel over time. The downlink channel used for downlink data transmission at a future moment is different from the CSI obtained based on SRS and channel reciprocity at the current moment. The CSI is inaccurate, affecting the performance of data transmission. At present, in order to alleviate the problem of CSI aging, network equipment needs to estimate the uplink CSI based on the SRS at multiple moments in the past, analyze the law of CSI change over time, and predict the downlink CSI at future moments.

However, in the above method, due to the non-ideal nature of the terminal device's sending link hardware, the SRS sent by the terminal device will deviate from the actual SRS, resulting in low accuracy of the uplink CSI estimated by the network device, making it difficult for the network device to analyze how the CSI changes over time, thereby reducing the performance of the network device's channel prediction.

Summary of the invention

The embodiments of the present application disclose a communication method and related products, which can improve the performance of channel prediction.

In a first aspect, an embodiment of the present application discloses a communication method, the method comprising: based on at least one first port set, receiving a downlink reference signal at a first moment and a second moment respectively; the first port set comprises one or more antenna ports; sending feedback information, the feedback information being used to indicate a plurality of phase difference feedback amounts; each of the phase difference feedback amounts corresponds to one of the at least one first port set; the phase difference feedback amount is used to indicate the phase difference information between the downlink reference signal received by the corresponding antenna port in the first port set at the first moment and the second moment.

In the embodiment of the present application, the antenna port may be a physical antenna port or a virtual logical antenna port. It is understandable that if the terminal device includes only one first port set, the first port set may correspond to multiple phase difference feedback amounts indicated by the feedback information, and if the terminal device includes two or more first port sets, each first port set may correspond to one or more phase difference feedback amounts.

Optionally, if the terminal device includes only one first port set, the first port set may also correspond to one phase difference feedback amount, and correspondingly, the above feedback information may be used to indicate the phase difference feedback amount. Exemplarily, the first port set includes one antenna port or includes multiple antenna ports with coherence capability. If the channel corresponding to each antenna port in the first port set has the same or similar time-varying law, then the phase difference information between the downlink reference signals corresponding to each antenna port at different times (such as the first time and the second time) is also the same or similar, so the above feedback information may include only one phase difference feedback amount, which is used to indicate the above same or similar phase difference information, so as to reduce the feedback overhead of the phase difference feedback amount.

Generally, for the uplink channel estimation result, its phase information not only includes the random phase information generated by the hardware of the terminal device transmitter (such as the opening/closing of the RF link, the change of the transmission power of the RF link, etc.), but also includes the phase change caused by the change of the channel itself over time. In the present application, since the downlink reference signal generally does not include the random phase generated by the transmitter hardware, the phase difference information between the downlink reference signals indicated by the above phase difference feedback amount can reflect the change of the downlink channel itself corresponding to the antenna port in the first port set between the first moment and the second moment. Therefore, when the uplink channel and the downlink channel at the same moment are regarded as the same channel (such as when the uplink channel and the downlink channel meet reciprocity), the change of the downlink channel itself between the first moment and the second moment can be equivalent to the change of the uplink channel itself between the first moment and the second moment. Further, based on the above phase difference feedback amount, the phase change caused by the change of the uplink channel itself over time in the uplink channel estimation result can be excluded, and then the above random phase information caused by the hardware of the terminal device transmitter can be determined, which helps to improve the accuracy of channel prediction.

In combination with the first aspect, in an optional implementation manner, each of the phase difference feedback amounts is used to indicate the first end corresponding to it. The phase difference information between the downlink reference signals received by the antenna ports in the first port set at the first moment and the second moment includes at least one of the following items: the phase difference feedback amount is used to indicate the phase difference information between the downlink reference signals received by the corresponding antenna ports in the first port set at the first moment and the second moment; the phase difference information between the downlink reference signals is the phase information of the cross-correlation of the downlink reference signals received by the antenna ports in the first port set at the first moment and the second moment; the phase difference feedback amount is used to indicate the phase difference information between the channels of the corresponding antenna ports in the first port set at the first moment and the second moment; the phase difference information between the channels is the phase information of the cross-correlation of the channels at the first moment and the channels at the second moment; the channel at the first moment is determined based on the downlink reference signal received by the antenna ports in the first port set at the first moment, and the channel at the second moment is determined based on the downlink reference signal received by the antenna ports in the first port set at the second moment.

It can be understood that the cross-correlation can be used to indicate the similarity between the measurement signal (such as the downlink reference signal or the estimated channel) at the first moment and the second moment. The phase information of the cross-correlation of the downlink reference signal is the phase difference between the downlink reference signal at the first moment and the second moment calculated based on the cross-correlation algorithm. Similarly, the phase information of the cross-correlation of the channel is the phase difference between the channel at the first moment and the second moment calculated based on the cross-correlation algorithm.

In this embodiment, the phase information of the mutual correlation of the downlink reference signals at different times is fed back, which can shorten the calculation process of the phase difference feedback amount and reduce the calculation overhead. Optionally, the phase information of the mutual correlation of the channels at different times is fed back, wherein the channel at the first moment and the channel at the second moment can be represented by the corresponding CSI estimation result or channel coefficient (the channel coefficient can be a partial coefficient in the CSI estimation result). Exemplarily, if represented by the CSI estimation result, the phase information of the mutual correlation of the above channels can be used to represent the phase difference information between the CSI estimation result at the first moment and the CSI estimation result at the second moment, and the phase difference feedback amount is determined based on the phase difference information. If a channel coefficient that is less affected by the noise interference generated by other signal characteristics in the CSI is selected, the influence of noise interference can be reduced, and the accuracy of the phase difference feedback amount can be further improved.

In combination with the first aspect, in an optional implementation, the method further includes: based on the at least one first port set, sending SRS at a third moment and a fourth moment; the time interval between the first moment and the third moment is a first time difference, and the time interval between the second moment and the fourth moment is a second time difference; the phase difference feedback amount corresponds to one third moment and one fourth moment.

It should be understood that there is a certain delay between the sending time and receiving time corresponding to the same downlink reference signal. In this application, for the convenience of description, the sending time and receiving time of the downlink reference signal are described as the first time and the second time. Similarly, the sending time and receiving time of the SRS are described as the third time and the fourth time. The first time, the second time, the third time, and the fourth time can also be a time unit, such as the first time unit, the second time unit, the third time unit, and the fourth time unit. Specifically, it can be one OFDM symbol or two OFDM symbols. Other descriptions of time in this application can also be the time units described above.

In combination with the first aspect, in an optional implementation, the first time difference is less than a first threshold, and the second time difference is less than the first threshold; or, the first time difference is less than or equal to the first threshold, and the second time difference is less than or equal to the first threshold.

It can be understood that since the channel changes over time, in order to satisfy the reciprocity between the uplink channel and the downlink channel, that is, in order to make the change of the downlink channel itself reflected by the phase difference feedback amount between the first moment and the second moment equivalent to the change of the uplink channel itself between the third moment and the fourth moment, the time interval between the sending moment of the downlink reference signal and the sending moment of the SRS should be as small as possible, that is, the first time difference and the second time difference should be as small as possible. Therefore, this embodiment constrains the first time difference and the second time difference by setting a time upper limit (first threshold), which can avoid the problem of low accuracy of the phase difference feedback amount caused by the above-mentioned time interval being too long. Optionally, the time lower limit of the above-mentioned first time difference and the above-mentioned second time difference can be determined based on the constraints of the communication protocol frame structure, and the constraints of the downlink reference signal processing timing (such as the timing constraints of determining the phase difference feedback amount based on the downlink reference signal, or the timing constraints of determining the corresponding channel based on the downlink reference signal).

In combination with the first aspect, in an optional embodiment, the first threshold satisfies any one of the following: the first threshold is equal to one quarter of the third time difference, and the third time difference is the time interval between the third moment and the fourth moment; the first threshold is equal to one fifth of the third time difference; the first threshold is equal to one eighth of the third time difference; the first threshold is equal to 5 time slots; the first threshold is equal to 2 time slots; the first threshold is equal to 1 time slot.

It can be understood that the time slot can be determined based on the subcarrier spacing. For example, under the specifications of the fifth-generation (5th-generation, 5G) new radio (new radio, NR) standard, if the subcarrier spacing is 15KHz, the corresponding time slot can be 1 millisecond, and if the subcarrier spacing is 30KHz, the corresponding time slot can be 0.5 milliseconds.

In combination with the first aspect, in an optional implementation, the phase difference feedback amount is used to compensate for a difference between a random phase corresponding to the SRS sent at the third moment and a random phase corresponding to the SRS sent at the fourth moment.

It is understandable that each phase difference feedback amount can be used to compensate for the difference between the random phase corresponding to the SRS at the third moment and the random phase corresponding to the fourth moment corresponding to the first port set, the second port set and the first frequency domain position set or the first frequency domain basis set.

In combination with the first aspect, in an optional implementation manner, the phase difference feedback amount corresponds to a second port set; the second port The set includes one or more downlink reference signal ports; the phase difference feedback amount corresponds to a first frequency domain position set or corresponds to a first frequency domain basis set; the first frequency domain position set includes one or more frequency domain positions, and the first frequency domain basis set includes one or more frequency domain bases.

It can be understood that the above-mentioned downlink reference signal port can be used to send a downlink reference signal. The first frequency domain position set can be a set consisting of a set of frequency domain subcarrier indices, each frequency domain subcarrier index corresponds to a frequency domain position, and the downlink reference signal or estimated channel on the corresponding frequency domain subcarrier can be obtained through the frequency domain subcarrier index to calculate the phase difference feedback amount. Exemplarily, after receiving the frequency domain signal, the downlink reference signal or estimated channel corresponding to the specified frequency domain index can be extracted in the frequency domain to calculate the phase difference feedback amount.

The frequency domain basis refers to that for multiple frequency domain positions within a frequency domain bandwidth, the reference signal vector or channel vector of the above frequency domain position is multiplied by a specific transformation matrix to obtain a reference signal vector in a transform domain or a channel vector in a transform domain. Each column of the transformation matrix is called a frequency domain basis. Exemplarily, the transformation matrix can be a discrete Fourier transform (DFT) matrix. Correspondingly, the frequency domain basis set can include one or more columns of the transformation matrix. Exemplarily, when performing correlation calculations based on the frequency domain basis set, the reference signal vector or channel vector of the frequency domain position can be first multiplied by one or more columns of the selected transformation matrix to obtain a reference signal vector in a transform domain or a channel vector in a transform domain, and then the correlation calculation is performed based on the reference signal vector or channel vector in the transform domain.

Exemplarily, when a first port set corresponds to multiple phase difference feedback amounts, the second port set corresponding to each phase difference feedback amount may be different, and the corresponding first frequency domain position set or first frequency domain basis set may also be different.

In combination with the first aspect, in an optional implementation, any two of the multiple phase difference feedback amounts satisfy at least one of the following: the first port sets corresponding to the any two phase difference feedback amounts are different; the second port sets corresponding to the any two phase difference feedback amounts are different; the first frequency domain position sets or first frequency domain basis sets corresponding to the any two phase difference feedback amounts are different.

It can be understood that if the first port set, the second port set and the first frequency domain position set/first frequency domain basis set are specified, a phase difference feedback amount can be uniquely determined. Accordingly, if any one or more of the first port set, the second port set and the first frequency domain position set/first frequency domain basis set corresponding to the two phase difference feedback amounts are different, the two phase difference feedback amounts are different. Exemplarily, the multiple phase difference feedback amounts indicated by the above feedback information can be different (i.e., for the same channel, only one phase difference feedback amount is fed back) to reduce the additional overhead caused by repeated feedback.

In combination with the first aspect, in an optional implementation, the transmitting antenna port set corresponding to the downlink reference signal at the first moment includes the second port set, and the transmitting antenna port set corresponding to the downlink reference signal at the second moment includes the second port set; the frequency domain bandwidth corresponding to the downlink reference signal at the first moment includes the bandwidth corresponding to the first frequency domain position set or the bandwidth corresponding to the first frequency domain basis set, and the frequency domain bandwidth corresponding to the downlink reference signal at the second moment includes the bandwidth corresponding to the first frequency domain position set or the bandwidth corresponding to the first frequency domain basis set; the transmitting antenna port set corresponding to the SRS at the third moment includes the first port set, and the transmitting antenna port set corresponding to the SRS at the fourth moment includes the first port set; the frequency domain bandwidth corresponding to the SRS at the third moment includes the bandwidth corresponding to the first frequency domain position set or the bandwidth corresponding to the first frequency domain basis set, and the frequency domain bandwidth corresponding to the SRS at the fourth moment includes the bandwidth corresponding to the first frequency domain position set or the bandwidth corresponding to the first frequency domain basis set.

In this embodiment, it should be understood that the set of transmitting antenna ports corresponding to the downlink reference signal at the first moment and the set of transmitting antenna ports corresponding to the downlink reference signal at the second moment may be the same or different. The frequency domain bandwidth corresponding to the downlink reference signal at the first moment and the frequency domain bandwidth corresponding to the downlink reference signal at the second moment may be the same or different. The set of transmitting antenna ports corresponding to the SRS at the third moment and the set of transmitting antenna ports corresponding to the SRS at the fourth moment may be the same or different. The frequency domain bandwidth corresponding to the SRS at the third moment and the frequency domain bandwidth corresponding to the SRS at the fourth moment may be the same or different. No limitation is made here.

It can be understood that in order for the downlink reference signal corresponding to the second port set, the first frequency domain position set or the first frequency domain basis set to be received, at different times (the first time and the second time), the transmitting antenna port set corresponding to the downlink reference signal needs to include the above-mentioned second port set, and the corresponding frequency domain bandwidth needs to include the bandwidth corresponding to the first frequency domain position set or the first frequency domain basis set. Similarly, in order for the SRS corresponding to the first port set, the first frequency domain position set or the first frequency domain basis set to be received, at different times (the third time and the fourth time), the transmitting antenna port set corresponding to the SRS needs to include the above-mentioned first port set, and the corresponding frequency domain bandwidth needs to include the bandwidth corresponding to the first frequency domain position set or the first frequency domain basis set.

In combination with the first aspect, in an optional embodiment, the method also includes: receiving first indication information; or, sending the first indication information; the first indication information is used to indicate any one or more of the first port set, the second port set, and the first frequency domain position set or the first frequency domain basis set corresponding to the phase difference feedback amount.

Exemplarily, transmitting and receiving a signal (such as a downlink reference signal, an estimated channel, or an SRS) according to the first indication information helps to accurately receive/send the signal. Calculating a phase difference feedback amount according to the first indication information helps to accurately calculate the phase difference feedback amount.

Optionally, when any two or more of the first port set, the second port set, and the frequency domain position set or the frequency domain basis set have an associated relationship, the first indication information may also indicate any one or more of the items with an associated relationship, as well as some items that have not established an associated relationship with other items. Correspondingly, the recipient of the first indication information may learn the remaining unindicated items based on the associated relationship, so as to reduce the amount of information in the first indication information and reduce the overhead of sending the first indication information.

In combination with the first aspect, in an optional implementation, the method further includes: determining the first port set based on SRS port information; the SRS port information is information of the transmitting antenna port set corresponding to the SRS at the third moment and the transmitting antenna port set corresponding to the SRS at the fourth moment.

Exemplarily, by configuring the corresponding SRS port information when configuring SRS resources, the first port set corresponding to each phase difference feedback amount is determined, which can simplify the interaction process between the SRS receiver and sender regarding the first port set.

In combination with the first aspect, in an optional implementation, the method further includes: determining the second port set based on downlink reference signal port information; the downlink reference signal port information is information of the transmitting antenna port set corresponding to the downlink reference signal at the first moment and the transmitting antenna port set corresponding to the downlink reference signal at the second moment; determining the first frequency domain position set based on the second frequency domain position set and the third frequency domain position set; the second frequency domain position set is one or more frequency domain positions corresponding to the SRS at the third moment and the fourth moment, and the third frequency domain position set is one or more frequency domain positions corresponding to the downlink reference signal at the first moment and the second moment; or, determining the first frequency domain basis set based on the second frequency domain basis set and the third frequency domain basis set; the second frequency domain basis set is one or more frequency domain basis corresponding to the SRS at the third moment and the fourth moment, and the third frequency domain basis set is one or more frequency domain basis corresponding to the downlink reference signal at the first moment and the second moment.

Exemplarily, by determining the second port set corresponding to each phase difference feedback amount through the downlink reference signal port information corresponding to the configuration of the downlink reference signal resources, and the frequency domain position set (the second frequency domain position set and the third frequency domain position set) or the frequency domain basis set (the second frequency domain basis set and the third frequency domain basis set) corresponding to the configuration of the SRS resources and the downlink reference signal resources, the first frequency domain position set or the first frequency domain basis set corresponding to each phase difference feedback amount is determined, and the interaction process between the receiver and the sender of the downlink reference signal regarding the second port set, the first frequency domain position set or the first frequency domain basis set can be simplified.

In combination with the first aspect, in an optional embodiment, when the first port set includes multiple antenna ports, any two antenna ports in the first port set have coherence capability; when the second port set includes multiple downlink reference signal ports, any two downlink reference signal ports in the second port set have coherence capability.

Exemplarily, the at least one first port set may be divided based on the coherence capability between the antenna ports of the terminal device, wherein any two antenna ports in each first port set are coherent, that is, when any two antenna ports in each first port set send/receive signals at the same time, the transmit/receive links corresponding to the any two antenna ports have the same influence on the amplitude and phase of the signal. Similarly, any two downlink reference signal ports in the second port set are coherent, wherein each downlink reference signal port may correspond to at least one antenna port. Exemplarily, for any two downlink reference signal ports in the second port set, if at least one antenna port corresponding to one of the downlink reference signal ports is coherent with at least one antenna port corresponding to the other downlink reference signal port, it can be indicated that the above-mentioned any two downlink reference signal ports have coherence capability. In this embodiment, the port set is divided based on the coherence capability so as to realize sharing of the same phase difference feedback amount for multiple antenna ports, thereby saving the overhead of calculating and feeding back the phase difference feedback amount.

In combination with the first aspect, in an optional implementation, the downlink reference signal includes any one of a channel state information-reference signal (CSI-RS), a tracking reference signal (TRS), a phase tracking reference signal (PT-RS) and a demodulation reference signal (DM-RS).

In a second aspect, an embodiment of the present application discloses a communication method, the method comprising: sending a downlink reference signal at a first moment and a second moment respectively based on at least one second port set; the second port set includes one or more downlink reference signal ports; receiving feedback information, the feedback information being used to indicate multiple phase difference feedback amounts; each of the phase difference feedback amounts being used to indicate the phase difference information between the downlink reference signal received by the antenna port in the corresponding first port set at the first moment and the second moment; the first port set includes one or more antenna ports; each of the phase difference feedback amounts corresponds to one of the at least one first port set.

In combination with the second aspect, in an optional implementation, each of the phase difference feedback amounts is used to indicate the phase difference information between the downlink reference signals received by the corresponding antenna port in the first port set at the first moment and the second moment, including at least one of the following: the phase difference feedback amount is used to indicate the phase difference information between the downlink reference signals received by the corresponding antenna port in the first port set at the first moment and the second moment; the phase difference information between the downlink reference signals is the cross-correlation phase information of the downlink reference signals received by the antenna port in the first port set at the first moment and the second moment; the phase difference feedback amount is used to indicate the phase difference information between the channels of the corresponding antenna port in the first port set at the first moment and the second moment; The phase difference information between the channels is the phase information of the mutual correlation between the channel at the first moment and the channel at the second moment; the channel at the first moment is determined based on the downlink reference signal received by the antenna port in the first port set at the first moment, and the channel at the second moment is determined based on the downlink reference signal received by the antenna port in the first port set at the second moment.

In combination with the second aspect, in an optional implementation, the method further includes: receiving SRS at a third moment and a fourth moment; the time interval between the first moment and the third moment is a first time difference, and the time interval between the second moment and the fourth moment is a second time difference; the phase difference feedback amount corresponds to one third moment and one fourth moment.

In combination with the second aspect, in an optional implementation, the first time difference is less than a first threshold, and the second time difference is less than the first threshold; or, the first time difference is less than or equal to the first threshold, and the second time difference is less than or equal to the first threshold.

In combination with the second aspect, in an optional embodiment, the first threshold satisfies any one of the following: the first threshold is equal to one quarter of the third time difference, and the third time difference is the time interval between the third moment and the fourth moment; the first threshold is equal to one fifth of the third time difference; the first threshold is equal to one eighth of the third time difference; the first threshold is equal to 5 time slots; the first threshold is equal to 2 time slots; the first threshold is equal to 1 time slot.

In combination with the second aspect, in an optional implementation, the phase difference feedback amount is used to compensate for a difference between a random phase corresponding to the SRS received at the third moment and a random phase corresponding to the SRS received at the fourth moment.

In combination with the second aspect, in an optional embodiment, the phase difference feedback amount corresponds to a second port set in the at least one second port set; the phase difference feedback amount corresponds to a first frequency domain position set or corresponds to a first frequency domain basis set; the first frequency domain position set includes one or more frequency domain positions, and the first frequency domain basis set includes one or more frequency domain bases.

In combination with the second aspect, in an optional implementation, any two of the multiple phase difference feedback amounts satisfy at least one of the following: the first port sets corresponding to the any two phase difference feedback amounts are different; the second port sets corresponding to the any two phase difference feedback amounts are different; the first frequency domain position sets or first frequency domain basis sets corresponding to the any two phase difference feedback amounts are different.

In combination with the second aspect, in an optional implementation, the transmitting antenna port set corresponding to the downlink reference signal at the first moment includes the second port set, and the transmitting antenna port set corresponding to the downlink reference signal at the second moment includes the second port set; the frequency domain bandwidth corresponding to the downlink reference signal at the first moment includes the bandwidth corresponding to the first frequency domain position set or the bandwidth corresponding to the first frequency domain basis set, and the frequency domain bandwidth corresponding to the downlink reference signal at the second moment includes the bandwidth corresponding to the first frequency domain position set or the bandwidth corresponding to the first frequency domain basis set; the transmitting antenna port set corresponding to the SRS at the third moment includes the first port set, and the transmitting antenna port set corresponding to the SRS at the fourth moment includes the first port set; the frequency domain bandwidth corresponding to the SRS at the third moment includes the bandwidth corresponding to the first frequency domain position set or the bandwidth corresponding to the first frequency domain basis set, and the frequency domain bandwidth corresponding to the SRS at the fourth moment includes the bandwidth corresponding to the first frequency domain position set or the bandwidth corresponding to the first frequency domain basis set.

In combination with the second aspect, in an optional embodiment, the method includes: sending first indication information, or receiving the first indication information; the first indication information is used to indicate any one or more of the first port set, the second port set, and the first frequency domain position set or the first frequency domain basis set corresponding to the phase difference feedback amount.

In combination with the second aspect, in an optional implementation, the first port set is determined based on SRS port information, and the SRS port information is information of a transmitting antenna port set corresponding to the SRS at the third moment and a transmitting antenna port set corresponding to the SRS at the fourth moment.

In combination with the second aspect, in an optional implementation, the second port set is determined based on the downlink reference signal port information, and the downlink reference signal port information is information of the transmitting antenna port set corresponding to the downlink reference signal at the first moment and the transmitting antenna port set corresponding to the downlink reference signal at the second moment; the first frequency domain position set is determined based on the second frequency domain position set and the third frequency domain position set, and the second frequency domain position set is one or more frequency domain positions corresponding to the SRS at the third moment and the fourth moment, and the third frequency domain position set is one or more frequency domain positions corresponding to the downlink reference signal at the first moment and the second moment; or, the first frequency domain basis set is determined based on the second frequency domain basis set and the third frequency domain basis set; the second frequency domain basis set is one or more frequency domain basis corresponding to the SRS at the third moment and the fourth moment, and the third frequency domain basis set is one or more frequency domain basis corresponding to the downlink reference signal at the first moment and the second moment.

In combination with the second aspect, in an optional embodiment, when the first port set includes multiple antenna ports, any two antenna ports in the first port set have coherence capability; when the second port set includes multiple downlink reference signal ports, any two downlink reference signal ports in the second port set have coherence capability.

In combination with the second aspect, in an optional implementation, the downlink reference signal includes any one of CSI-RS, TRS, PT-RS and DM-RS.

Regarding the technical effects brought about by the second aspect and any optional implementation of the second aspect, reference may be made to the first aspect and the first aspect. The technical effects of any optional implementation scheme described above will not be elaborated here.

In a third aspect, the present application discloses a communication device, comprising a unit for executing the method as described in the first aspect or any optional implementation of the first aspect; or, a unit for executing the method as described in the second aspect or any optional implementation of the second aspect.

In a fourth aspect, the present application discloses a communication device, comprising a memory and a processor; the memory is used to store programs; the processor is used to execute the programs stored in the processor, and when the program is executed by the processor, the processor executes the method described in the first aspect or any optional implementation of the first aspect; or, the processor executes the method described in the second aspect or any optional implementation of the second aspect.

In a fifth aspect, the present application discloses a communication device, comprising a logic circuit and an interface, wherein the logic circuit is coupled to the interface; the interface is used to input and/or output code instructions, and the logic circuit is used to execute the code instructions. When the code instructions are executed by the logic circuit, the logic circuit executes the method described in the first aspect or any optional embodiment of the first aspect; or, the logic circuit executes the method described in the second aspect or any optional embodiment of the second aspect.

In a sixth aspect, the present application discloses a computer storage medium, wherein a computer program is stored in the computer storage medium, and the computer program includes program instructions. When the program instructions are executed by a processor, the processor executes the method described in the first aspect or any optional embodiment of the first aspect; or, the processor executes the method described in the second aspect or any optional embodiment of the second aspect.

In the seventh aspect, the present application discloses a computer program product, which includes a computer program or a computer code. When the computer program or the computer code runs on a computer, the method described in the first aspect or any optional embodiment of the first aspect is executed; or, the method described in the second aspect or any optional embodiment of the second aspect is executed.

In an eighth aspect, the present application discloses a communication system, comprising a terminal device and a network device, wherein the terminal device is used to execute the method described in the first aspect or any optional embodiment of the first aspect, and the network device is used to execute the method described in the second aspect or any optional embodiment of the second aspect.

BRIEF DESCRIPTION OF THE DRAWINGS

The following is an introduction to the drawings used in the embodiments of the present application.

FIG1 is a schematic diagram of the architecture of a communication system provided in an embodiment of the present application;

FIG2 is a schematic diagram of a scenario of a channel prediction method based on SRS channel estimation results provided by an embodiment of the present application;

FIG3 is a schematic diagram of a scenario of a channel prediction method based on CSI feedback results provided in an embodiment of the present application;

FIG4 is an interactive schematic diagram of a communication method provided in an embodiment of the present application;

FIG5 is an interactive schematic diagram of a communication method provided in an embodiment of the present application;

FIG6 is a schematic diagram of a scenario of a communication method provided in an embodiment of the present application;

FIG7a is a schematic diagram of a scenario of a communication method provided in an embodiment of the present application;

FIG7b is an interactive schematic diagram of a communication method provided in an embodiment of the present application;

FIG8 is a schematic diagram of a scenario of a communication method provided in an embodiment of the present application;

FIG9a is a schematic diagram of a scenario of a communication method provided in an embodiment of the present application;

FIG9b is an interactive schematic diagram of a communication method provided in an embodiment of the present application;

FIG10 is a schematic diagram of the structure of a communication device provided in an embodiment of the present application;

FIG11 is a schematic diagram of the structure of a communication device provided in an embodiment of the present application;

FIG. 12 is a schematic diagram of the structure of a communication device provided in an embodiment of the present application.

Detailed ways

In order to make the objectives, technical solutions and advantages of the present application clearer, the embodiments of the present application are described below in conjunction with the drawings in the embodiments of the present application.

The terms "first" and "second" in the specification, claims and drawings of this application are used to distinguish different objects, rather than to describe a specific order. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device that includes a series of steps or units is not limited to the listed steps or units, but may optionally include steps or units that are not listed, or may optionally include other steps or units that are inherent to these processes, methods, products or devices.

The “embodiment” mentioned in this document means that a particular feature, structure, or characteristic described in conjunction with the embodiment may be included in at least one embodiment of the present application. In one embodiment. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It can be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

It should be understood that in the present application, "at least one (item)" means one or more, "more than one" means two or more, and "at least two (items)" means two or three and more than three. "And/or" is used to describe the association relationship of associated objects, indicating that three relationships may exist. For example, "A and/or B" can mean: only A exists, only B exists, and A and B exist at the same time, where A and B can be singular or plural. The character "/" generally indicates that the objects associated before and after are in an "or" relationship. "At least one of the following items" or similar expressions refers to any combination of these items, including any combination of single items or plural items. For example, at least one of a, b or c can mean: a, b, c, "a and b", "a and c", "b and c", or "a and b and c", where a, b, c can be single or multiple.

FIG1 is a schematic diagram of the architecture of a communication system provided by an embodiment of the present application. As shown in FIG1, the communication method provided by the present application can be applied to a mobile communication system, and the mobile communication system includes a network device 101 and a terminal device 102. Exemplarily, the terminal device 102 can calculate and feed back a phase difference feedback amount to the network device 101 based on the received downlink reference signal, so that the network device 101 compensates for the difference in the random phase of the SRS generated when the terminal device 102 sends the SRS.

Exemplarily, the above mobile communication system may be a 5G mobile communication system, or a new communication system in future communication development, such as a sixth-generation (6G) mobile communication system. Furthermore, the above method may also be applied to mobile wireless communication scenarios. For example, the above mobile communication system may be a cellular mobile wireless communication system, or a wireless local area network (WLAN) system, such as mobile wireless fidelity (WI-FI). It is understandable that the above communication system may be applied to low-frequency scenarios (sub 6G) or high-frequency scenarios (above 6G).

Exemplarily, the network device 101 shown in FIG. 1 may be an access network device. Among them, the access network device refers to a device that provides network access functions, such as a radio access network (RAN) base station. Exemplarily, the network device 101 may be an evolved node B (eNB), the next generation Node B (gNB), a home node B (HNB), or a base station in a future mobile communication system. Understandably, the network device 101 may include a base station (BS), or a base station and a wireless resource management device for controlling the base station. Exemplarily, the terminal device 102 shown in FIG. 1 may be a mobile phone, a tablet computer (pad), a virtual reality (VR) terminal, an augmented reality (AR) terminal, a wireless terminal in the field of unmanned driving, a wireless terminal in the field of telemedicine, etc.

The following is an introduction to the channel prediction method in the prior art.

Generally, according to the different ways of obtaining CSI on the network device side, the channel prediction methods mainly include two types: a channel prediction method based on SRS channel estimation results and a channel prediction method based on CSI feedback results. The above two types of methods will be introduced respectively below.

The channel prediction method based on SRS channel estimation results can be applied to TDD mMIMO mobile communication systems. In this method, the network equipment can estimate the uplink CSI based on the SRS sent by the terminal device, and then predict the downlink channel at a specific time in the future based on channel reciprocity (the uplink channel is the same as the downlink channel at the same time) and the uplink CSI estimated at multiple times.

The channel prediction method based on the SRS channel estimation result is described in detail below in conjunction with Figure 2. Figure 2 is a scenario diagram of a channel prediction method based on the SRS channel estimation result provided by an embodiment of the present application.

Based on FIG. 2 , the above method may include the following steps:

S201: The network device sends SRS indication information, and correspondingly, the terminal device receives the SRS indication information.

The SRS indication information is used to indicate the SRS resources configured on the terminal device side, and the terminal device can configure the SRS resources according to the SRS resource indication information.

S202: The network device receives the SRS at different times. Correspondingly, the terminal device sends the SRS at different times based on the received SRS indication information.

As shown in Fig. 2, after configuring the SRS resource according to the SRS resource indication information, the terminal device sends the SRS to the network device at different times _t1 , _t2 to _tM (M≥2). Correspondingly, the network device receives the SRS at different times.

S203: The network device performs channel estimation on the uplink channel based on the SRS received at different times, and obtains a CSI estimation result corresponding to each time.

The network device can use a specific channel estimation algorithm to perform channel estimation on the SRS channels (uplink channels) corresponding to different times t ₁ , t ₂ to t _M based on the SRS received at different times, and can obtain the uplink CSI estimation results corresponding to each time.

S204: The terminal device predicts the downlink channel at a specific time in the future based on the CSI estimation results corresponding to different time periods.

Network equipment can be based on Calculate the law of channel changes over time and predict based on a specific channel prediction algorithm CSI at the future downlink transmission time. Furthermore, the network device may also perform downlink weight calculation and downlink data transmission based on the predicted CSI at the future downlink transmission time.

It is understandable that when the terminal device sends SRS at different times, due to the non-ideal nature of the transmission link (such as the opening/closing of the RF link, changes in the transmission power of the RF link, etc.), a random phase will be generated when the terminal device sends SRS at different times, resulting in the inability to ensure phase consistency between the SRS sent at different times. Furthermore, when the network device performs channel estimation on the uplink channel, it is affected by the random phase of the SRS, and the CSI estimation result at each moment is It will contain a random phase that is difficult to eliminate. This random phase will destroy the original phase information in the uplink CSI estimation result, affect the original time-varying law of the CSI estimation result, and further affect the performance of the channel prediction algorithm.

In order to improve the performance of the channel prediction algorithm, the above-mentioned channel prediction algorithm based on the SRS channel estimation result can also be combined with the time domain correlation of the channel fed back by the terminal device. Specifically, the terminal device can estimate the CSI of the downlink channel at each moment based on the downlink reference signal (such as TRS) received at different moments, further calculate the correlation between the downlink channels at different moments (including amplitude information and phase information), and feed it back to the network device. Correspondingly, the network device calculates the algorithm parameters of the channel prediction based on the correlation information fed back by the terminal device to improve the performance of the above-mentioned channel prediction algorithm. However, it can be understood that this method still cannot eliminate the influence of the random phase of SRS on channel prediction.

Similarly, the channel prediction method based on CSI feedback results can be applied to TDD mMIMO mobile communication systems. In this method, the terminal device can estimate the downlink CSI based on the received downlink reference signal (such as CSI-RS), and then perform CSI quantization compression feedback according to the protocol specifications, and feed back the downlink CSI to the network device. Correspondingly, the network device can predict the downlink channel at a specific time in the future based on the downlink CSI fed back by the terminal device.

The above-mentioned channel prediction method based on CSI feedback results will be described in detail below in conjunction with Figure 3. Figure 3 is a scenario diagram of a channel prediction method based on CSI feedback results provided in an embodiment of the present application.

Based on FIG3 , the above method includes the following steps:

S301: The network device sends CSI-RS resource indication information. Correspondingly, the terminal device receives the CSI-RS resource indication information.

The CSI-RS resource indication information may be used to indicate the CSI-RS resources configured on the terminal device side, and the terminal device may perform CSI-RS resource configuration according to the CSI-RS resource indication information.

S302: The network device sends CSI-RS at different times, and correspondingly, the terminal device receives the CSI-RS at different times.

As shown in FIG3 , the network device sends CSI-RS at different times, and then the terminal device receives the CSI-RS sent by the network device at t ₁ , t ₂ to t _M (M≥2) respectively according to the instruction of the network device.

S303: The terminal device performs channel estimation on the downlink channel based on the CSI-RS received at different times, and obtains the downlink CSI estimation result corresponding to each time.

As shown in FIG3 , the network device can use a specific channel estimation algorithm to perform channel estimation on the CSI-RS channels (downlink channels) corresponding to t ₁ , t ₂ to t _M based on the CSI-RS received at different times, and can obtain the downlink CSI estimation results corresponding to each time.

S304: The terminal device feeds back the downlink CSI estimation results corresponding to different time periods to the network device. Correspondingly, the network device can predict the downlink channel at a specific time period in the future based on the downlink CSI estimation results at different time periods.

After obtaining the downlink CSI estimation result at each moment, the terminal device can quantize and compress the CSI according to the specification of the communication protocol to feed back the downlink CSI estimation result to the network device. Then the network device can use the CSI feedback results at different moments (the downlink CSI estimation result fed back by the terminal device) to ), calculate the law of channel changes over time, and predict the downlink channel at a specific time in the future based on a specific channel prediction algorithm. Furthermore, the network device can also perform downlink weight calculation and downlink data transmission based on the prediction result of the downlink channel at a specific time.

It can be understood that channel prediction based on CSI feedback results relies on the terminal device to measure and feedback complete CSI (downlink CSI estimation results). The CSI-RS overhead and CSI feedback overhead are large, which affects the downlink and uplink transmission rates. In addition, compressed feedback of CSI will cause quantization loss, making the feedback CSI less accurate, thereby affecting the accuracy of channel prediction.

In response to the problems existing in the above methods, the embodiments of the present application provide a communication method and related products, which can feedback the information of the random phase difference corresponding to the uplink channel to improve the accuracy of channel prediction.

The above communication method will be described in detail below in conjunction with Figure 4, which is an interactive schematic diagram of a communication method provided in an embodiment of the present application.

As shown in FIG4 , the above communication method may include the following steps:

S401: A first communication device receives a downlink reference signal at a first time and a second time based on at least one first port set, The first port set includes one or more antenna ports.

In the present application, the antenna port may be an entity physical antenna port or a virtual logical antenna port. The downlink reference signal includes but is not limited to any one of CSI-RS, TRS, PT-RS and DM-RS.

Exemplarily, the terminal device may divide each antenna port into at least one first port set based on the coherence capability between each antenna port. Any two antenna ports in each first port set are coherent, that is, when any two antenna ports in each first port set send/receive signals at the same time, the transmit/receive links corresponding to the any two antenna ports have the same influence on the amplitude and phase of the signal.

S402: The first communication device sends feedback information, where the feedback information is used to indicate a plurality of phase difference feedback amounts.

Each of the phase difference feedback amounts corresponds to one of the at least one first port set; the phase difference feedback amount is used to indicate the phase difference information between the downlink reference signals received by the corresponding antenna port in the first port set at the first moment and the second moment.

It can be understood that if the terminal device includes a first port set, the multiple phase difference feedback amounts indicated by the feedback information may correspond to the first port set. If the terminal device includes two or more first port sets, each phase difference feedback amount corresponds to one of the two or more first port sets. Exemplarily, for a first port set, if the antenna ports in the first port set support receiving downlink reference signals of different frequency bands at the same time, the antenna ports in the first port set can receive multiple different downlink reference signals at the same time. Correspondingly, the phase difference information between the downlink reference signals received by the antenna ports in the first port set at the first time and the second time may be different. Further, the phase difference information between the downlink reference signals in multiple frequency bands at different times may be indicated by multiple phase difference feedback amounts, that is, among the multiple phase difference feedback amounts indicated by the feedback information, two or more phase difference feedback amounts may correspond to the same first port set. It should be understood that the phase difference information between the downlink reference signals indicated by the multiple phase difference feedback amounts may be different.

Optionally, if the terminal device includes only one first port set, the first port set may also correspond to one phase difference feedback amount, and correspondingly, the above feedback information may be used to indicate the phase difference feedback amount. Exemplarily, the first port set includes one antenna port, or includes multiple antenna ports with coherence capability. If the channel corresponding to each antenna port in the first port set has the same or similar time-varying law, then the phase difference information between the downlink reference signals corresponding to each antenna port at different times (such as the first time and the second time) is also the same or similar. Therefore, the feedback information sent by the first communication device may include only one phase difference feedback amount to indicate the above-mentioned same or similar phase difference information. Correspondingly, the antenna ports in each first antenna port set share the same phase difference feedback amount, saving the overhead of calculating and feeding back the phase difference feedback amount.

Generally, for the uplink channel estimation result, its phase information not only includes the random phase information generated by the hardware of the transmitter (such as the antenna port of the above-mentioned terminal device), but also includes the phase change caused by the change of the channel itself over time. In the present application, since the downlink reference signal generally does not include the random phase generated by the hardware of the transmitter, the phase difference information between the downlink reference signals indicated by the above-mentioned phase difference feedback amount can reflect the change of the downlink channel itself corresponding to the antenna port in the first port set between the first moment and the second moment. Therefore, when the uplink channel and the downlink channel at the same moment are regarded as the same channel (such as when the uplink channel and the downlink channel meet reciprocity), the change of the downlink channel itself between the third moment and the fourth moment can be equivalent to the change of the uplink channel itself between the first moment and the second moment. Further, it is helpful for the network device to exclude the phase change caused by the change of the uplink channel itself over time in the uplink channel estimation result based on the above-mentioned phase difference feedback amount, and then the above-mentioned random phase information can be determined, which helps to improve the accuracy of channel prediction.

The calculation formula for the above-mentioned phase difference feedback amount will be introduced below and will not be elaborated here.

It can be understood that, compared with feeding back downlink CSI at different times or correlation information of downlink CSI (including amplitude information and phase information), the present application feeds back phase difference information corresponding to downlink reference signals at different times, and the feedback overhead is lower.

In some possible embodiments, each phase difference feedback amount may also correspond to a second port set, the second port set including one or more downlink reference signal ports, the downlink reference signal port being used to send a downlink reference signal. Similarly, the downlink reference signal port may be an entity physical antenna port or a virtual logical antenna port.

Optionally, each phase difference feedback amount may also correspond to a first frequency domain position set or a first frequency domain basis set, wherein the first frequency domain position set includes one or more frequency domain positions, and the first frequency domain basis set includes one or more frequency domain basis.

Exemplarily, the frequency domain position set may be a set consisting of a set of frequency domain subcarrier indices, each frequency domain subcarrier index corresponds to a frequency domain position, and the first communication device may obtain a downlink reference signal or an estimated channel on the corresponding frequency domain subcarrier through the frequency domain subcarrier index to calculate the phase difference feedback amount. Exemplarily, after receiving the frequency domain signal, the first communication device extracts the downlink reference signal or the estimated channel corresponding to the specified frequency domain index in the frequency domain for calculating the phase difference feedback amount.

The frequency domain basis refers to the multiplication of the reference signal vector or channel vector of the above frequency domain positions within a frequency domain bandwidth. With a specific transformation matrix, a reference signal vector in a transform domain or a channel vector in a transform domain is obtained. Each column of the transform matrix is called a frequency domain basis. Exemplarily, the transform matrix can be a DFT matrix. Correspondingly, the frequency domain basis set can include one or more columns of the transform matrix. Exemplarily, when performing correlation calculations based on the frequency domain basis set, the reference signal vector or channel vector at the frequency domain position can be multiplied with one or more columns of the selected transform matrix to obtain the reference signal vector in the transform domain or the channel vector in the transform domain, and then the correlation calculation is performed based on the reference signal vector in the transform domain or the channel vector in the transform domain.

In some possible embodiments, in order to enable the antenna ports in the first port set to receive the downlink reference signal corresponding to the second port set, the first frequency domain position set or the first frequency domain basis set, the downlink reference signal port sets corresponding to the downlink reference signal at different times (the first time and the second time) need to include the above-mentioned second port set, and the corresponding frequency domain bandwidth needs to include the bandwidth corresponding to the first frequency domain position set or the first frequency domain basis set. Exemplarily, when the terminal device configures the downlink reference signal resources according to the instructions of the network device, the first communication device can determine the second port set based on the downlink reference signal port information included in the indication information corresponding to the downlink reference signal resources, so that the downlink reference signal port corresponding to the downlink reference signal at the first moment includes the above-mentioned second port set, and the downlink reference signal port corresponding to the downlink reference signal at the second moment includes the above-mentioned second port set. Similarly, based on the third frequency domain position set or the third frequency domain basis set included in the indication information corresponding to the downlink reference signal resource, the first frequency domain position set or the first frequency domain basis set is determined, so that the frequency domain bandwidth corresponding to the downlink reference signal at the first moment includes the frequency domain bandwidth corresponding to the first frequency domain position set or the first frequency domain basis set, and the frequency domain bandwidth corresponding to the downlink reference signal at the second moment includes the frequency domain bandwidth corresponding to the first frequency domain position set or the first frequency domain basis set. It can be understood that the frequency domain bandwidth corresponding to the first frequency domain basis set refers to the frequency domain bandwidth corresponding to the first frequency domain basis set before the transformation, and accordingly, the frequency domain bandwidth corresponding to the downlink reference signal at the first moment or the second moment includes multiple frequency domain positions before the transformation.

Similarly, in order for the second communication device to receive the SRS corresponding to the first port set, the first frequency domain position set or the first frequency domain basis set, the transmitting antenna port set corresponding to the SRS at different times (the third time and the fourth time) needs to include the above-mentioned first port set, and the corresponding frequency domain bandwidth needs to include the frequency domain bandwidth corresponding to the first frequency domain position set or the first frequency domain basis set. Exemplarily, when the terminal device configures the SRS resource according to the instruction of the network device, the first communication device can determine the first port set based on the SRS port information contained in the indication information corresponding to the SRS resource, so that the transmitting antenna port set corresponding to the SRS at the third moment includes the first port set, and the transmitting antenna port set corresponding to the SRS at the fourth moment includes the first port set. Similarly, based on the second frequency domain position set or the second frequency domain basis set contained in the indication information corresponding to the SRS resource, the first frequency domain position set or the first frequency domain basis set is determined, so that the frequency domain bandwidth corresponding to the SRS at the third moment includes the frequency domain bandwidth corresponding to the frequency domain position set or the frequency domain basis set, and the frequency domain bandwidth corresponding to the SRS at the fourth moment includes the frequency domain bandwidth corresponding to the frequency domain position set or the frequency domain basis set. Correspondingly, the frequency domain bandwidth corresponding to the SRS at the third moment or the fourth moment includes multiple frequency domain positions before the transformation. Optionally, the first communication device can also determine the first frequency domain position set/first frequency domain basis set based on the second frequency domain position set/second frequency domain basis set and the third frequency domain position set/third frequency domain basis set.

It can be understood that if the first port set, the second port set, and the first frequency domain position set/first frequency domain basis set are specified, a phase difference feedback amount can be uniquely determined. Accordingly, if any one or more of the first port set, the second port set, and the first frequency domain position set/first frequency domain basis set corresponding to the two phase difference feedback amounts are different, the two phase difference feedback amounts are different. Exemplarily, the multiple phase difference feedback amounts indicated by the above feedback information can be different (that is, for the same channel, only one phase difference feedback amount is fed back) to reduce the additional overhead caused by repeated feedback.

In some possible embodiments, the above communication method may further include:

S403: The first communication device sends an SRS at a third moment and a fourth moment based on the at least one first port set.

The time interval between the first moment and the third moment is a first time difference, the time interval between the second moment and the fourth moment is a second time difference, and the phase difference feedback amount corresponds to one third moment and one fourth moment.

It can be understood that since the channel changes over time, in order to satisfy the reciprocity between the uplink channel and the downlink channel, that is, in order to make the change of the downlink channel itself reflected by the phase difference feedback amount between the first moment and the second moment equivalent to the change of the uplink channel itself between the third moment and the fourth moment, the time interval between the sending moment of the downlink reference signal and the sending moment of the SRS should be as small as possible, that is, the first time difference and the second time difference should be as small as possible. Therefore, this embodiment constrains the first time difference and the second time difference by setting a time upper limit (first threshold), which can avoid the problem of low accuracy of the phase difference feedback amount caused by the above-mentioned long time interval. Specifically, the above-mentioned first time difference is less than the first threshold, and the above-mentioned second time difference is less than the above-mentioned first threshold; or, the above-mentioned first time difference is less than or equal to the above-mentioned first threshold, and the above-mentioned second time difference is less than or equal to the above-mentioned first threshold.

Exemplarily, the first threshold may satisfy any one of the following: the first threshold is equal to one quarter of the third time difference, where the third time difference is the time interval between the third moment and the fourth moment; the first threshold is equal to one fifth of the third time difference; the first threshold is equal to one eighth of the third time difference; the first threshold is equal to the time of 5 time slots; the first threshold is equal to 2 The time of a time slot; the above-mentioned first threshold is equal to the time of 1 time slot.

It can be understood that the time slot can be determined based on the subcarrier spacing. For example, under the specification of the 5G NR protocol, if the subcarrier spacing is 15 kilohertz (KHz), the corresponding time slot can be 1 millisecond, and if the subcarrier spacing is 30KHz, the corresponding time slot can be 0.5 milliseconds.

Optionally, the first time difference and the second time difference may be constrained based on the channel coherence time, so that the time interval between the sending time of each downlink reference signal and the sending time of its corresponding SRS is as short as possible to the channel coherence time, so that the channel does not change much between the two times, and further, the phase difference measured by the downlink reference signal (such as the phase difference indicated by the above phase difference feedback amount) can be used to represent the phase difference of the uplink channel. Exemplarily, the channel coherence time can be determined based on the carrier frequency of the communication system and the moving speed of the terminal device, such as the channel coherence time _Tc can satisfy the following relationship:
T _c = c/(2fv)

Among them, c is the speed of light, f is the carrier frequency of the communication system, and v is the moving speed of the terminal device.

Optionally, the lower time limit of the first time difference and the second time difference can be determined based on the constraints of the communication protocol frame structure, and/or based on the constraints of the downlink reference signal processing timing (such as the timing constraints of determining the phase difference feedback amount based on the downlink reference signal, and/or the timing constraints of determining the corresponding channel based on the downlink reference signal). Exemplarily, if the terminal device requires 1 millisecond to complete the downlink reference signal processing, and the terminal device simultaneously sends the SRS and the phase difference feedback amount at the fourth moment, then the lower time limit of the second time difference is 1 millisecond, otherwise the terminal device cannot complete the calculation of the phase difference feedback amount before the fourth moment.

In some possible embodiments, before the above S402, the method may further include:

S404: The first communication device receives the first indication information. Alternatively, the first communication device sends the first indication information.

The first indication information is used to indicate any one or more of the first port set, the second port set, the first frequency domain position set or the first frequency domain basis set corresponding to the phase difference feedback amount.

Exemplarily, receiving and transmitting a signal (such as a downlink reference signal, an estimated channel, or an SRS) according to the first indication information helps to achieve more accurate reception/transmission of the signal. Calculating the phase difference feedback amount according to the first indication information helps to achieve accurate calculation of the phase difference feedback amount.

Optionally, in the case where an association is established between any two or more of the first port set, the second port set, and the first frequency domain position set or the first frequency domain base set, the first indication information may also indicate any one or more of the items among which an association is established, as well as some items that are not associated with other items. Correspondingly, the recipient of the first indication information may obtain the first port set, the second port set, and the first frequency domain position set or the first frequency domain base set corresponding to the above-mentioned phase difference feedback amount based on the indication of the first indication information and the association. It is understandable that, compared with indicating all the correspondences between the first port set, the second port set, the first frequency domain position set or the first frequency domain base set and the above-mentioned phase difference feedback amount, indicating the above-mentioned correspondences based on the associations can reduce the amount of information in the first indication information and reduce the overhead of sending the first indication information.

For example, if an association relationship is established between the first port set and the second port set, and the association relationship has been configured in the terminal device or the network device, the first indication information can indicate any one of the first port set and the second port set, and the party receiving the first indication information can obtain the first port set, the second port set, and the first frequency domain position set or the first frequency domain base set corresponding to the above-mentioned phase difference feedback amount based on the indication of the first indication information and the association relationship. It can be understood that at this time, the first indication information can also indicate the first frequency domain position set or the first frequency domain base set corresponding to the above-mentioned phase difference feedback amount.

Alternatively, if an association relationship is established between the first port set and the first frequency domain position set or the first frequency domain base set, and the association relationship has been configured in the terminal device or the network device, the first indication information can indicate the first port set and any one of the frequency domain position set or the frequency domain base set, and the party receiving the first indication information can obtain the first port set, the second port set, and the first frequency domain position set or the first frequency domain base set corresponding to the above-mentioned phase difference feedback amount based on the association relationship. It can be understood that at this time, the first indication information can also indicate the second port set corresponding to the above-mentioned phase difference feedback amount.

Alternatively, if an association relationship is established between the second port set and the first frequency domain position set or the first frequency domain base set, the first indication information can indicate any one of the second port set and the first frequency domain position set or the first frequency domain base set, and the party receiving the first indication information can obtain the first port set, the second port set, and the first frequency domain position set or the first frequency domain base set corresponding to the above-mentioned phase difference feedback amount based on the association relationship. It can be understood that at this time, the first indication information can also indicate the first port set corresponding to the above-mentioned phase difference feedback amount.

Alternatively, if an association relationship is established between the first port set, the second port set, and the first frequency domain position set or the first frequency domain base set, the first indication information may indicate any one of the first port set, the second port set, and the frequency domain position set or the frequency domain base set. It should be noted that, when the terminal device or network device is configured with any of the above association relationships, the first indication information may still indicate any one or more of the association relationships involved, which is not limited here.

In some possible embodiments, the first communication device may also indicate the first corresponding to the phase difference feedback amount in an implicit indication manner. Any one or more of the port set, the second port set, and the first frequency domain position set or the first frequency domain basis set, that is, instead of using separate indication information (first indication information) to indicate the above-mentioned first port set, the second port set, and the first frequency domain position set or the first frequency domain basis set, the original downlink reference signal (such as CSI-RS) or SRS indication information in the relevant communication protocol standard is used to indicate the SRS port information, frequency domain position information or frequency domain basis information (corresponding to the second frequency domain position set or the second frequency domain basis set) corresponding to the SRS configured by the network device for the terminal device, and the downlink reference signal port information, frequency domain position information or frequency domain basis information (corresponding to the third frequency domain position set or the third frequency domain basis set) corresponding to the downlink reference signal configured by the network device for the terminal device. Accordingly, the above method also includes the following steps:

S405: The first communication device determines a first port set corresponding to the phase difference feedback amount based on the SRS port information.

S406: The first communication device determines a second port set corresponding to the phase difference feedback amount based on the downlink reference signal port information.

S407: The first communication device determines the first frequency domain position set corresponding to the phase difference feedback amount based on the second frequency domain position set and the third frequency domain position set, or the first communication device determines the first frequency domain basis set corresponding to the phase difference feedback amount based on the second frequency domain basis set and the third frequency domain basis set.

Exemplarily, the first communication device may determine the second frequency domain position set or the second frequency domain basis set based on the frequency domain position information or the frequency domain basis information corresponding to the SRS, and may determine the third frequency domain position set or the third frequency domain basis set based on the frequency domain position information or the frequency domain basis information corresponding to the downlink reference signal. Then, the first communication device may determine the first frequency domain position set corresponding to the phase difference feedback amount based on the second frequency domain position set and the third frequency domain position set, and may determine the first frequency domain basis set corresponding to the phase difference feedback amount based on the second frequency domain basis set and the third frequency domain basis set. Optionally, the first frequency domain position set may be the intersection of the second frequency domain position set and the third frequency domain position set, and the first frequency domain basis set may be the intersection of the second frequency domain basis set and the third frequency domain basis set.

Exemplarily, the feedback information sent by the first communication device may include the above-mentioned implicit indication content. Correspondingly, after receiving the feedback information, the second communication device may obtain the port information, frequency domain position or frequency domain base information corresponding to each phase difference feedback amount based on the content.

It can be understood that compared with the explicit indication method corresponding to the above-mentioned first indication information, the above-mentioned implicit indication method can simplify the interaction process between the receiver and sender of the SRS/downlink reference signal regarding the first port set, the second port set, the first frequency domain position set or the first frequency domain basis set.

The above communication method will be described in detail below in conjunction with Figure 5, which is a scenario diagram of a communication method provided in an embodiment of the present application.

As shown in FIG5 , the above communication method may include the following steps:

S501: A second communication device sends a downlink reference signal at a first time and a second time respectively based on at least one second port set, where the second port set includes one or more downlink reference signal ports.

In the present application, a downlink reference signal port is used to send a downlink reference signal, which may be a physical antenna port or a virtual logical antenna port. The downlink reference signal includes but is not limited to any one of CSI-RS, TRS, PT-RS and DM-RS.

Exemplarily, the network device may divide each downlink reference signal port into at least one second port set based on whether each downlink reference signal port is coherent, wherein any two downlink reference signal ports in each second port set are coherent, that is, when any two downlink reference signal ports in each second port set send/receive signals at the same time, the transmission/reception links corresponding to the any two downlink reference signal ports have the same influence on the amplitude and phase of the signal.

S502: The second communication device receives feedback information, where the feedback information is used to indicate a plurality of phase difference feedback amounts.

The above-mentioned phase difference feedback amount is used to indicate the phase difference information between the downlink reference signals received by the antenna ports in the first port set at the above-mentioned first moment and the above-mentioned second moment; the above-mentioned first port set includes one or more antenna ports of the terminal device; the above-mentioned first port set corresponds to at least one phase difference feedback amount among the above-mentioned multiple phase difference feedback amounts.

It can be understood that any one of the above-mentioned multiple phase difference feedback amounts corresponds to a second port set. Optionally, if the above-mentioned feedback information only indicates one phase difference feedback amount, the phase difference feedback amount can uniquely correspond to a second port set. For other descriptions of S502, reference can be made to the introduction of S402 in the above-mentioned embodiment, and no further description is given here.

In general, for the uplink channel estimation result, its phase information not only includes the random phase information generated by the hardware of the transmitter (such as the antenna port of the above-mentioned terminal device), but also includes the phase change caused by the change of the channel itself over time. In the present application, since the downlink reference signal generally does not include the random phase generated by the hardware of the transmitter, the phase difference information between the downlink reference signals indicated by the above-mentioned phase difference feedback amount can reflect the changes in the downlink channel itself corresponding to the antenna port in the first port set between the first moment and the second moment. Therefore, when the uplink channel and the downlink channel at the same moment are regarded as the same channel (such as when the uplink channel and the downlink channel satisfy reciprocity), the changes in the downlink channel itself between the first moment and the second moment can be equivalent to the changes in the uplink channel itself between the first moment and the second moment. Furthermore, based on the above-mentioned phase difference feedback amount, the network device can exclude the uplink channel estimation. The phase change in the result caused by the uplink channel itself changing over time can then determine the above-mentioned random phase information, which helps to improve the accuracy of channel prediction of network devices.

In some possible embodiments, after S502, based on the phase difference feedback amount indicated by the feedback information, the network device may also compensate for the difference in the random phase of the SRS contained in the uplink channel. Exemplarily, the above method may also include the following steps:

S503: The second communication device receives the SRS at the third time and the fourth time.

Generally, when the SRS sent by the first communication device is not interfered, one or more receiving ports of the second communication device receive the SRS sent by the first communication device. Therefore, the second communication device needs to determine the SRS consistent with the beam direction of the sent downlink reference signal based on all received SRSs. The determination method is to calculate the projection of all received SRSs in the downlink reference signal beam direction. The specific implementation of the second communication device determining the SRS consistent with the beam direction of the sent downlink reference signal will be described below and will not be introduced here.

Optionally, the above method may further include:

S504: The second communication device sends the first indication information. Alternatively, the second communication device receives the first indication information.

The first indication information is used to indicate any one or more of the first port set, the second port set, the first frequency domain position set or the first frequency domain basis set corresponding to the phase difference feedback amount. The implementation of S504 may refer to the relevant introduction of the aforementioned embodiment S404, which will not be described here.

S505: The second communication device performs channel estimation on the uplink channel based on the received SRS at the third moment and the fourth moment to obtain an uplink channel estimation result.

Generally, the uplink channel can be determined based on the first port set, the second port set, and the first frequency domain position set or the first frequency domain basis set. Exemplarily, the feedback information received by the second communication device may include the first port set corresponding to each phase difference feedback amount, and the information of the first frequency domain position set or the first frequency domain basis set corresponding to each phase difference feedback amount. The second communication device can determine the corresponding uplink channel based on this, and perform channel estimation on the uplink channel to obtain the uplink channel estimation result. Exemplarily, the first port set, the second port set, and the first frequency domain position set or the first frequency domain basis set corresponding to each phase difference feedback amount can be indicated by explicit indication or implicit indication. The specific implementation method and related instructions can refer to the relevant introduction of S404, which will not be repeated here.

S506: The second communication device compensates for the difference in SRS random phase corresponding to the second port set based on the multiple phase difference feedback amounts indicated by the feedback information and the uplink channel estimation result.

It can be understood that each phase difference feedback amount corresponds to the same uplink channel, and accordingly, each phase difference feedback amount can correspond to the uplink channel estimation result of the same uplink channel. Optionally, before determining and compensating the above-mentioned SRS random phase difference, the second communication device can also calculate the phase difference information of the uplink channel based on the uplink channel estimation results at the third moment and the fourth moment, and then compensate the above-mentioned SRS random phase difference based on the phase difference information of the uplink channel and the corresponding phase difference feedback amount.

Exemplarily, the difference in random phases corresponding to the SRS at the third moment and the fourth moment can be determined and compensated. In general, the phase difference information of the uplink channel includes the phase change caused by the change of the channel itself over time and the phase change caused by the random phase of the SRS. Based on the reciprocity of the uplink and downlink channels, the phase change caused by the change of the downlink channel itself over time indicated by the above phase difference feedback amount can be equivalent to the phase change caused by the change of the uplink channel itself over time. Therefore, when the phase difference information of the uplink channel and the above phase difference feedback amount are obtained, the second communication device can obtain the information of the random phase of the SRS and can compensate for the difference in the random phase of the SRS at different moments. Furthermore, the second communication device performs channel prediction based on the compensated channel estimation result, which can improve the performance of channel prediction.

In the methods shown in Figures 4 and 5, the implementation method not described in detail in one method can refer to another method, which will not be described in detail here. Exemplarily, in combination with Figures 4 and 5, an embodiment of the present application also provides a method, such as the method may include the above-mentioned S401 and S402, and S501 and S502; for example, the method may include S401, S402, S403, and S501, S502, S503; for example, the method may include S401, S402, S403, S404, and S501, S502, S503, S504; for example, the method may include S401, S402, S403, S405, S406, S407, and S501, S502, S503.

Exemplarily, in the methods shown in FIG. 4 and FIG. 5 , the calculation formula corresponding to the phase difference feedback amount may be pre-specified in the standard, or may be indicated by the second communication device to the first communication device.

The following will take the compensation of the difference of the random phase of SRS at two moments as an example, and combine with Figure 6 provided in the embodiment of the present application to further illustrate the communication method provided by the present application. Figure 6 is a scene diagram of a communication method provided in the embodiment of the present application.

Based on the relevant introduction of the embodiments corresponding to FIG4 and FIG5, in this embodiment, the downlink (including the transmission link of the second communication device and the reception link of the first communication device) can maintain the consistency of amplitude and phase at different times. As shown in FIG6, for a phase difference feedback amount, its calculation process can be described as follows:

S601: The second communication device sends resource indication information to the first communication device. Correspondingly, the first communication device receives the resource indication information.

Exemplarily, the resource indication information can be used to indicate the resource position of the downlink reference signal at two moments (the first moment and the second moment) and the resource position of the SRS at two corresponding moments (the third moment and the fourth moment), so that each downlink reference signal moment is close to the corresponding SRS moment. The above-mentioned downlink reference signal may include any one of CSI-RS, TRS, PT-RS and DM-RS. It can be understood that the above-mentioned downlink reference signal moment may refer to the moment of sending/receiving the downlink reference signal, and the above-mentioned SRS moment may refer to the moment of sending/receiving the SRS. For the relevant description of the downlink reference signal moment and the SRS moment, refer to the relevant introduction of S403, which will not be repeated here.

S602: The second communication device sends a downlink reference signal at the downlink reference signal resource location indicated by the resource indication information. Correspondingly, the first communication device receives the downlink reference signal.

Exemplarily, the second communication device may send a downlink reference signal at the first time and the second time respectively. Correspondingly, the first communication device receives the downlink reference signal.

S603: The first communication device performs downlink channel estimation based on the received downlink reference signal, and calculates a phase difference feedback amount based on downlink channel estimation results at different times.

Exemplarily, the results of downlink channel estimation at the first moment and the second moment are respectively Since the same downlink can maintain the consistency of amplitude and phase at different times, The following relationship can be satisfied:

in, and are the real downlink channels at the first moment and the second moment respectively. are the errors of downlink channel estimation at the first moment and the second moment respectively.

Then, the first communication device is based on The phase difference feedback amount δ can be calculated, and δ can satisfy the following relationship:

The calculation formula f must satisfy that for any channel vector h ₁ ,h ₂ , any phase Amplitude The following equation holds:

The meaning of the above formula is that as a function of describing the phase difference, the calculation result has nothing to do with the amplitude a ₁ , a ₂ , but has nothing to do with the phase The relationship between them depends only on the difference between them. Multiplying by h ₁ can rotate the argument of each element in h ₁ by θ ₁ . Similarly, Multiplication with h ₂ can rotate the argument of each element in h ₂ by θ _2. Exemplarily, formula f may be pre-specified in the standard or indicated by the second communication device to the first communication device. The specific form of formula f will be further described below.

S604: The first communication device sends an SRS at the SRS resource location indicated by the resource indication information. Correspondingly, the second communication device receives the SRS.

Exemplarily, the first communication device may send a downlink reference signal at the third time and the fourth time respectively, and correspondingly, the second communication device receives the downlink reference signal.

It is understandable that the execution order of S604 may be before or after S603, which is not limited here. Exemplarily, the execution order of S604 and S603 may be determined based on the capability of the first communication device to calculate the phase difference feedback amount, so as to flexibly adapt to first communication devices with different computing capabilities.

S605: The second communication device performs uplink channel estimation based on the received SRS, and calculates phase difference information corresponding to the uplink channel based on uplink channel estimation results at different times.

Exemplarily, the results of uplink channel estimation at the first time and the second time (or the third time and the fourth time) are respectively Affected by the random phase of SRS, The following relationship can be satisfied:

in, are the SRS random phases at the third and fourth moments, and are the real uplink channels at the first and second moments respectively, are the uplink channel estimation errors at the third moment and the fourth moment respectively.

Since each downlink reference signal is close to the corresponding SRS time, it can be considered that the channel does not change substantially between the downlink reference signal sending time and the SRS sending time, and the uplink and downlink channels satisfy reciprocity, that is,

Then, the second communication device is based on The phase difference information δ′ of the uplink channel at the third moment and the fourth moment can be calculated, and δ′ can satisfy the following relationship:

Furthermore, δ′ can satisfy the following relationship:

S606: The first communication device sends a phase difference feedback value, and correspondingly, the second communication device receives the phase difference feedback value.

Exemplarily, the execution order of S605 may be before or after the first communication device sends the SRS at the fourth moment, and the first communication device may also synchronously send or carry the phase difference feedback amount when sending the SRS at the fourth moment, which is not limited here. Other descriptions of S606 may refer to the relevant introduction of S402 in the aforementioned embodiment, which will not be repeated here.

S607: The second communication device determines and compensates for the SRS random phase difference based on the phase difference feedback amount and the phase difference information of the uplink channel.

Assuming that the channel estimation error is negligible, the following equation holds true:

The second communication device only needs to calculate δ′-δ. Since δ′-δ=θ ₂ -θ ₁ (mod 2π), the difference θ ₂ -θ ₁ between the random phases of the SRS at two moments can be obtained.

Finally, perform SRS random phase difference compensation to obtain The compensated value The calculation method is as follows:

Then the result after random phase difference compensation satisfies the following relationship:

Understandably, and The phase difference information between the third moment and the fourth moment has eliminated the difference in the SRS random phase corresponding to the third moment, that is, after the phase difference compensation and The random phase in is the same random phase It can be understood as, and There is phase consistency between them, so the law of channel changes over time is no longer subject to the same random phase When the second communication device is based on and By analyzing the law of channel changes and performing channel prediction, the influence of random phase differences has been eliminated, which can improve the performance of channel prediction.

Exemplarily, the channel estimated based on the downlink reference signal and SRS in the present application may correspond to the full channel matrix of all transmit and receive ports and all frequency domains/frequency domain bases at different times, or may correspond to the partial channel elements of the channel matrix at some transmit and receive ports and all or part of the frequency domain/frequency domain bases (it can be understood that a channel element may correspond to the value at a position in the channel), or may correspond to the partial channel elements of the channel matrix at some or all transmit and receive ports and part of the frequency domain/frequency domain bases. No limitation is made here. It can be understood that for the downlink channel estimated based on the downlink reference signal, the above-mentioned transmit and receive port includes an antenna port for receiving and sending the downlink reference signal, and for the uplink channel estimated based on the SRS, the above-mentioned transmit and receive port includes an antenna port for sending and receiving the SRS. When implementing the communication method provided in the present application, the above-mentioned transmit and receive port may include at least one first port set and at least one second port set, and the above-mentioned frequency domain/frequency domain base may include a first frequency domain position set/a first frequency domain base set.

The calculation formula of the phase difference feedback amount will be described below based on FIG. 4 , FIG. 5 , FIG. 6 and related embodiments.

In some possible embodiments, the phase difference information between the downlink reference signals received by the antenna ports in the first port set at the first moment and the downlink reference signals received at the second moment can be directly represented by the phase difference information between the downlink reference signals received by the antenna ports in the first port set at the first moment and the second moment, so as to shorten the calculation process of the phase difference feedback amount and reduce the calculation overhead.

Exemplarily, the phase difference information between the downlink reference signals is the phase information of the cross-correlation of the downlink reference signals received by the antenna ports in the first port set at the first moment and the second moment, wherein the cross-correlation can be used to indicate the similarity between the downlink reference signals at the first moment and the second moment, and the cross-correlation phase information of the downlink reference signals is the phase difference between the downlink reference signals at the first moment and the second moment calculated based on the cross-correlation algorithm. Specifically, based on the cross-correlation algorithm, the phase difference feedback amount δ can satisfy the following relationship:

Wherein, δ is the phase difference between the downlink reference signals received by the antenna ports of the first port set at the first moment and the second moment. The complex argument (arg) function is used to calculate the phase of the complex number. y ₁ ,y ₂ are column vectors consisting of the downlink reference signals corresponding to the first port set, the second port set, the first frequency domain position set/the first frequency domain basis set specified at the first moment and the second moment, respectively. is the row vector obtained by conjugate transpose of y ₁ , Yes and the phase of the inner product of y _2. Correspondingly, the first communication device can feedback The phase of the inner product of y and y ₂ .

Exemplarily, in addition to calculating the phase of the cross-correlation of the downlink reference signal as described above, the downlink reference signals received by the antenna ports of the first port set at the first moment and the second moment may be projected onto the same base B, and then the phase change δ of the cross-correlation of the downlink reference signal projections is calculated. Specifically, the projection results corresponding to the downlink reference signals _y1 and _y2 received at the first moment and the second moment are and The following relationship can be satisfied:

Wherein, the basis B satisfies B ^H B is the unit matrix, and B ^H is the row vector obtained by the conjugate transpose of B. Accordingly, the phase change δ of the cross-correlation of the downlink reference signal projection can satisfy the following relationship:

Among them, the arg function is used to take the phase of the complex number, yes The conjugate transposed matrix of Indicates taking and The phase of the inner product. Accordingly, the first communication device feedbacks and The phase of the inner product.

Exemplarily, in addition to the above-mentioned calculation of the phase of the cross-correlation of the vector composed of the downlink reference signal or its projection vector, the phase of the conjugate multiplication of specific elements (scalars) in the downlink reference signal can also be calculated. Equivalent to the selected second port set only including a downlink reference signal port with index i, the selected first port set only including an antenna port with index j, the selected frequency position set only including the frequency position corresponding to the frequency domain subcarrier with index k, and the corresponding downlink reference signals received at the first moment and the second moment are respectively Assuming that the phase difference feedback amount corresponding to the specific channel element is δ _i,j,k , δ _i,j,k can satisfy the following relationship:

in, and are conjugate complex numbers of each other. Indicates taking and Accordingly, the first communication device feeds back and The phase of the product.

It can be understood that the values of i, j, and k can be specified by the second communication device to the first communication device, or by the first communication device to the second communication device, or can be determined by the first communication device based on the downlink reference signal resource configuration and SRS resource configuration indicated by the second communication device. The specific implementation method can refer to the relevant introduction of explicit indication and implicit indication in the aforementioned embodiment, which will not be described in detail here. The other relevant calculation steps corresponding to the specific channel element can refer to the corresponding calculation method in Figure 6, which will not be described in detail here.

In some possible embodiments, the phase difference information between the downlink reference signals received by the antenna ports in the first port set at the first moment and the second moment indicated by the above-mentioned phase difference feedback amount can also be represented by the phase difference information between the channels of the antenna ports in the first port set at the first moment and the second moment, so as to improve the accuracy of the phase difference feedback amount.

Exemplarily, the phase difference information between the above-mentioned channels is the phase information of the cross-correlation of the channels at the first moment and the second moment. Among them, the channel at the first moment can be determined based on the downlink reference signal received by the antenna port in the first port set at the first moment, and the channel at the second moment can be determined based on the downlink reference signal received by the antenna port in the first port set at the second moment. For example, the first communication device can perform channel estimation on the downlink channels corresponding to the antenna ports in the first port set based on the downlink reference signals received by the antenna ports in the first port set at the first moment and the second moment, respectively, and the channel at the first moment and the channel at the second moment can be obtained. Exemplarily, the channel at the first moment and the channel at the second moment can be represented by CSI or channel coefficients. Cross-correlation can be used to represent the similarity between the channels at the first moment and the second moment, and the cross-correlation phase information of the channels is the phase difference between the channels at the first moment and the second moment calculated based on the cross-correlation algorithm. Specifically, based on the cross-correlation algorithm, the phase difference feedback amount δ can satisfy the following relationship:

Wherein, δ is the phase difference between the channels of the antenna ports of the first port set at the first moment and the second moment. The arg function is used to calculate the phase of a complex number. h ₁ ,h ₂ are column vectors consisting of the channels corresponding to the first port set, the second antenna port set, the first frequency domain position set/the first frequency domain basis set specified at the first moment and the second moment, respectively. is the row vector obtained by conjugate transpose of h ₁ , Yes and the phase of the inner product of h _2. Correspondingly, the first communication device can feedback and the phase of the inner product of _h2 .

Exemplarily, in addition to calculating the phase of the channel cross-correlation as described above, the channel at the first moment and the channel at the second moment may be projected onto the same basis B, and then the phase change δ of the cross-correlation of the estimated channel projections may be calculated. Specifically, the projection result corresponding to the channel _h1 at the first moment and the channel _h2 at the second moment is and The following relationship can be satisfied:

Wherein, the basis B is an orthogonal matrix, satisfying B ^H B is the unit matrix, where B ^H is the conjugate transposed matrix of B. Accordingly, the phase change δ of the cross-correlation of the estimated channel projections can satisfy the following relationship:

Among them, the arg function is used to take the phase of the complex number, yes The row vector obtained by conjugate transpose of Indicates taking and The phase of the inner product. Accordingly, the first communication device feedbacks and The phase of the inner product.

It can be understood that when calculating the phase difference feedback amount, the first communication device uses a channel based on the received downlink reference signal or estimated based on the downlink reference signal. Correspondingly, when the second communication device determines and compensates for the SRS random phase difference, it uses a channel estimated based on the received SRS.

Similarly, the estimated channel may also correspond to a specific channel element. For the relevant description of the specific channel element, reference may be made to the introduction in the aforementioned embodiment, which will not be elaborated herein.

Optionally, the channel at the first moment and the channel at the second moment may be represented by corresponding CSI estimation results or channel coefficients (the channel coefficients may be partial coefficients in the CSI estimation results). Exemplarily, if represented by CSI estimation results, the cross-correlation of the channels is The phase information can be used to represent the phase difference information between the CSI estimation result at the first moment and the CSI estimation result at the second moment. The phase difference feedback amount is determined based on the phase difference information, which can improve the accuracy of the phase difference feedback amount. If expressed by channel coefficients, the phase information of the cross-correlation of the above channels can be used to represent the phase difference information between the channel coefficients at the first moment and the channel coefficients at the second moment, and the phase difference feedback amount is determined based on the phase difference information. If a channel coefficient that is less affected by noise interference generated by other signal features in the CSI is selected, the impact of noise interference can be reduced, and the accuracy of the phase difference feedback amount can be further improved.

Exemplarily, based on the embodiments corresponding to Figures 4 to 6, the feedback information sent by the first communication device may include both the phase difference information between the above-mentioned downlink reference signals and the phase difference information between the above-mentioned channels. Optionally, the second communication device may perform channel prediction and downlink transmission based on any one or both of the above phase difference information, which is not limited here.

Optionally, based on the embodiments corresponding to FIG. 4 to FIG. 6, the feedback information sent by the first communication device may also include the phase of the downlink reference signal and/or the phase of the estimated channel at different times. Correspondingly, the first communication device may calculate the above-mentioned phase difference feedback amount based on the phase of the received downlink reference signal and/or the phase of the estimated channel. Taking the second moment as an example, the downlink reference signal and/or the channel estimated based on the downlink reference signal is expressed as Then the phase of the downlink reference signal and/or the channel estimated based on the downlink reference signal can be expressed as δ, and δ can satisfy the following relationship:

The calculation formula f must satisfy that for any channel vector h, any phase Amplitude The following equation holds:
f(ah)＝θ+f(h)(mod 2π)

Wherein, f(h)(mod 2π) means to make f(h) modulo 2π. For example, f(h) may be the phase of the inner product of a fixed vector e and h, that is, f(h)=arg(e ^H h). Similarly, the method of feeding back the phase of the downlink reference signal and/or the phase of the estimated channel may also be applicable to specific channel elements. For the relevant description of the specific channel elements, please refer to the introduction in the aforementioned embodiment, which will not be repeated here.

It can be understood that the calculation formula of the phase difference feedback amount shown in the above embodiment is only a possible example provided by the present application and does not constitute a limitation to the present application.

Exemplarily, when the terminal device includes two first port sets, the first communication device may respectively calculate and feed back the phase difference feedback amount corresponding to each first port set. The following will take the compensation of the SRS random phase as an example, and will be described in detail in conjunction with Figures 7a and 7b. Figure 7a is a scene schematic diagram of a communication method provided in an embodiment of the present application, and Figure 7b is an interactive schematic diagram of a communication method provided in an embodiment of the present application.

As shown in Figure 7a, taking the 5ms frame structure under the NR communication protocol as an example, the horizontal axis is time, and each square represents a time slot. Among them, "D" represents a downlink slot, "S" represents a special slot, and "U" represents an uplink slot. Assuming that a subframe contains one slot, the D subframe indicates that downlink data can be sent in the subframe, and the S subframe indicates that the special fields downlink pilot time slot (downlink pilot time slot, DwPTS), guard period (guard period, GP), and uplink pilot time slot (uplink pilot time slot, UpPTS) are sent in the subframe. The U subframe indicates that uplink data can be sent in the subframe. It can be understood that a subframe containing a slot is only an example provided by this application and is not limited here.

For example, a network device corresponds to a terminal device. The terminal device includes two antenna ports (antenna port 0 and antenna port 1), one transmit channel and two receive channels, that is, antenna port 0 and antenna port 1 cannot send SRS at the same time. When the first communication device sends SRS, it is necessary to send SRS at two different times by antenna selection. Exemplarily, antenna port 0 is used to send SRS at the previous moment, and antenna port 1 is used to send SRS at the next moment. Exemplarily, antenna port 0 and antenna port 1 do not have coherent capabilities and can correspond to two different first port sets respectively. It should be understood that the number of antenna ports and transmit/receive channel configuration of the terminal device shown in this embodiment is only an example and is not limited here.

As shown in FIG. 7a, the upward dotted arrow indicates the SRS resource of antenna port 0 of the terminal device, the upward solid arrow indicates the SRS resource of antenna port 1 of the terminal device, and the downward solid arrow indicates the downlink reference signal resource (such as CSI-RS resource). Under the frame structure of the NR protocol, the downlink reference signal and SRS resource can be configured as follows: for each special slot, the SRS resources are configured for antenna port 0 and antenna port 1 respectively on the last two orthogonal frequency division multiplexing (OFDM) symbols (such as configuring SRS resources for antenna port 0 on the second-to-last OFDM symbol and configuring SRS resources for antenna port 1 on the first-to-last OFDM symbol), and a downlink reference signal resource of a downlink reference signal port is configured on the third-to-last OFDM symbol, and the SRS and the downlink reference signal are configured on multiple identical frequency domain subcarriers.

Exemplarily, the second communication device may indicate the downlink reference signal configuration, SRS configuration, and phase difference feedback configuration to the first communication device through one or more indication information (such as the first indication information in the aforementioned embodiment). Specifically, two phase difference feedback amounts may be configured in this embodiment. The downlink reference signal port set corresponding to the first phase difference feedback amount (corresponding to the second port set in the aforementioned embodiment) is the downlink reference signal port of the third-to-last OFDM symbol, and the corresponding SRS antenna port set (corresponding to the first port set in the aforementioned embodiment) is the downlink reference signal port of the third-to-last OFDM symbol. The first frequency domain position set) is antenna port 0, and the corresponding frequency index set (corresponding to the first frequency domain position set in the aforementioned embodiment) is the subcarrier index set of the downlink reference signal and SRS configuration. Exemplarily, the first frequency domain position set can be the intersection of the subcarrier index set of the downlink reference signal configuration and the subcarrier index set of the SRS configuration. The downlink reference signal port set and frequency index set corresponding to the second phase difference feedback amount are the same as the first phase difference feedback amount, and the corresponding SRS antenna port set is antenna port 1.

The method is further described below by taking the phase difference feedback amount calculated based on the phase correlation of the downlink reference signals received at different times as an example. Referring to FIG. 7b , based on the application scenario shown in FIG. 7a , the method may include the following steps:

S701: The second communication device sends a downlink reference signal at a first time and a second time based on a downlink reference signal port. Correspondingly, the first communication device receives a downlink reference signal at a first time and a second time based on antenna port 0.

S702: The first communication device calculates a phase difference feedback amount based on the downlink reference signal received by antenna port 0 at the first time and the second time.

Exemplarily, the downlink reference signal received by antenna port 0 from the subcarriers where all downlink reference signals are located at the first moment is y ₁ , and the downlink reference signal received by antenna port 0 from the subcarriers where all downlink reference signals are located at the second moment is y ₂ , then the first communication device may calculate the phase difference feedback amount δ based on y ₁ and y ₂ , where δ may satisfy the following relationship:

S703: The first communication device sends feedback information to the second communication device, where the feedback information is used to indicate the phase difference feedback amount. Correspondingly, the second communication device receives the phase difference feedback amount indicated by the feedback information.

Regarding the specific implementation of S703, reference may be made to the introduction of S402 or S502 in the aforementioned embodiments, and detailed description is omitted here.

S704: The first communication device sends an SRS to the second communication device at a third time and a fourth time based on antenna port 0. Correspondingly, the second communication device receives the SRS at a third time and a fourth time based on a downlink reference signal port.

In order to satisfy the reciprocity between the downlink channel and the uplink channel, the time interval between the first moment and the third moment (corresponding to the first time difference in the aforementioned embodiment) and the time interval between the second moment and the fourth moment (corresponding to the second time difference in the aforementioned embodiment) should be as small as possible. For the specific introduction of the first time difference and the second time difference, please refer to the relevant introduction of S403 in the aforementioned embodiment, which will not be repeated here. It can be understood that the execution order of sending the SRS at the fourth moment in S704 can be before or after S703 or S702, and can also be executed synchronously with S703, which is not limited here.

S705: The second communication device calculates the phase difference information of the uplink channel based on the SRS at the third time and the fourth time received by the downlink reference signal port.

Exemplarily, assuming that the SRS sent by antenna port 0 of the terminal device is not interfered with, all antenna ports on the network device side can receive the SRS sent by antenna port 0 of the terminal device. Furthermore, the second communication device can determine the SRS that is consistent with the downlink reference signal beam direction received by the first communication device from the SRS received by all antenna ports, and calculate the projection in the downlink reference signal beam direction.

Specifically, the second communication device uses a beam pointing to the first communication device to send a downlink reference signal, and the weight vector used for beamforming is p. The SRS received by all antenna ports of the network device at the third moment and the fourth moment are S ₁ and S ₂ respectively. For S ₁ and S ₂ , the number of columns of the matrix is the number of antennas of the network device, and the number of rows of the matrix is the number of subcarriers corresponding to the SRS, then the projections z ₁ and z ₂ of S ₁ and S ₂ in the above downlink reference signal beam direction can satisfy the following relationship:
z ₁ =S ₁ p
z ₂ =S ₂ p

Then the phase difference information δ′ of the uplink channel can satisfy the following relationship:

S706: The second communication device determines and compensates for the SRS random phase difference based on the phase difference information of the uplink channel and the above phase difference feedback amount.

It can be understood that the phase difference information δ′ of the uplink channel includes both the phase change of the channel itself between two moments and the phase difference caused by the SRS random phase, and δ′-δ can be used as an estimated value of the SRS random phase difference.

Furthermore, when compensating for the SRS random phase difference, it is sufficient to subtract the phase difference feedback amount from the phase of the SRS at the second moment, that is, to calculate S ₂ e ^-j(δ′-δ) =S ₂ e ^j(δ-δ′) . Alternatively, S ₂ may not be compensated, and a channel containing the SRS random phase difference may be first estimated based on the SRS at the second moment, and then multiplied by e ^j(δ-δ′) .

Exemplarily, the second communication device compensates for the difference between the SRS random phase at each moment and the previous moment, and compensates in chronological order, so as to correct the differences between all SRS random phases and the SRS random phase at the previous moment in succession, thereby improving the accuracy of the channel prediction results.

Similarly, the same method is used for the second phase difference feedback amount, and the second communication device can determine and compensate for the difference in the SRS random phase corresponding to the antenna port 1 of the terminal device, which will not be elaborated here.

In a possible embodiment, the feedback information may include each phase difference feedback amount and the first port set, the second port set, The correspondence between any one or more of the first frequency domain position set or the first frequency domain basis set is to facilitate the second communication device to determine and compensate for the difference in the SRS random phase based on the correspondence. For the introduction of the above correspondence and the specific implementation of indicating the correspondence, please refer to the relevant introduction of the aforementioned embodiment S404, which will not be repeated here.

It can be understood that in this embodiment, since each first communication device feeds back the phase change of the downlink reference signal at different times and does not feed back the estimated channel itself, the amount of calculation is small and the corresponding feedback overhead is also low, and high-precision phase feedback can be achieved using multiple bits.

Exemplarily, the calculation formula corresponding to the second communication device when estimating the uplink channel and the calculation formula corresponding to the compensation of the SRS random phase difference may also be consistent with the calculation formula for calculating the phase feedback amount by the first communication device, so as to avoid calculation errors or complicated calculation process due to different calculation formulas, and improve the accuracy and efficiency of random phase difference compensation.

Exemplarily, the calculation formula for the phase difference feedback amount shown in this embodiment is only an example, and in fact, any calculation formula in the aforementioned embodiments can be adaptively selected.

The following will take the compensation of the SRS random phase difference as an example, and further introduce the communication method provided by the present application in the scenario where the downlink reference signal and SRS are configured in the same frequency domain bandwidth but different subcarriers in combination with Figure 8. Figure 8 is a scenario schematic diagram of a communication method provided by an embodiment of the present application.

As shown in FIG8 , taking a case where a network device corresponds to a terminal device as an example, the terminal device includes two antenna ports (antenna port 0 and antenna port 1), and the entire bandwidth is divided into two frequency hopping bandwidths (frequency hopping bandwidth 1 and frequency hopping bandwidth 2). Antenna port 0 and antenna port 1 send SRS by frequency hopping.

As shown in Figure 8, the upward dotted arrow indicates the SRS sent by the antenna port 0 of the terminal device, the upward solid arrow indicates the SRS sent by the antenna port 1 of the terminal device, and the downward solid arrow indicates the downlink reference signal sent by the downlink reference signal port of the network device. Under the frame structure of the NR protocol, the configuration method of the downlink reference signal and SRS resources can be: on the third-to-last OFDM symbol of each special slot, the second communication device uses the antenna 0 of the network device to send a downlink reference signal (such as CSI-RS) over the entire bandwidth. On the second-to-last OFDM symbol, the antenna port 0 of the terminal device sends SRS on the frequency hopping bandwidth 1, and does not send it on the frequency hopping bandwidth 2. The antenna port 1 of the terminal device does not send it on the frequency hopping bandwidth 1, and sends SRS on the frequency hopping bandwidth 2. On the last OFDM symbol, the two antenna ports of the terminal device exchange the frequency hopping bandwidth for sending SRS. The downlink reference signal and SRS occupy different subcarriers in the same bandwidth, but it can be guaranteed that the channel of all subcarriers in the bandwidth can be estimated by a specific channel estimation algorithm during channel estimation.

Exemplarily, four phase difference feedback quantities are configured, and the second communication device may send explicit indication information to the first communication device to indicate the antenna port and frequency hopping bandwidth on the terminal device side corresponding to each phase difference feedback quantity. Specifically, the above four phase difference feedback quantities may be respectively the phase of the cross-correlation of the channel estimated based on the downlink reference signal at antenna port 0 on frequency hopping bandwidth 1, the phase of the cross-correlation of the channel estimated based on the downlink reference signal at antenna port 0 on frequency hopping bandwidth 2, the phase of the cross-correlation of the channel estimated based on the downlink reference signal at antenna port 1 on frequency hopping bandwidth 1, and the phase of the cross-correlation of the channel estimated based on the downlink reference signal at antenna port 1 on frequency hopping bandwidth 2. Among them, regarding the specific implementation of displaying the indication information, reference may be made to the introduction of the first indication information in the aforementioned embodiment, which will not be repeated here.

Taking the calculation of the first phase difference feedback amount as an example, the corresponding downlink reference signal port set is the downlink reference signal port corresponding to the third to last OFDM symbol mentioned above, and the downlink reference signal port corresponds to antenna 0 of the network device. The corresponding terminal device antenna port set (first port set) is antenna port 0, and the corresponding frequency index set (first frequency domain position set) is the set of all subcarrier indexes within the frequency hopping bandwidth 1.

The first communication device receives a downlink reference signal at antenna port 0 and frequency hopping bandwidth 1, and estimates the downlink channel of antenna port 1 of the terminal device on all subcarriers included in frequency hopping bandwidth 1. The two moments are h ₁ and h ₂ respectively. Then the phase difference feedback amount δ calculated by the first communication device can satisfy the following relationship:

The first communication device then feeds back the phase difference feedback amount δ to the second communication device. The second communication device estimates the uplink channels of all subcarriers included in antenna port 0 and frequency hopping bandwidth 1 of the terminal device based on the SRS received by the network device antenna 0 on the second to last OFDM symbol in the special slot.

Since the first phase difference feedback amount corresponds to the same port set and frequency domain index set as the above-mentioned estimated uplink channel, the second communication device can determine and compensate for the difference in SRS random phase of antenna port 0 and frequency hopping bandwidth 1 of the terminal device. The method used to determine and compensate for the difference in random phase can correspond to the relevant introduction of the embodiment corresponding to reference Figure 6, which will not be described in detail here. The other three phase difference feedback amounts are based on the same method to respectively determine and compensate for the difference in SRS random phase of antenna port 0 of the terminal device on frequency hopping bandwidth 2, the difference in SRS random phase of antenna port 1 of the terminal device on frequency hopping bandwidth 1, and the difference in SRS random phase of antenna port 1 of the terminal device on frequency hopping bandwidth 2, which will not be described in detail here.

In this embodiment, phase difference feedback amounts can be configured for different antenna ports and different frequency hopping bandwidths of the terminal device, respectively. The phase difference feedback amounts correspond to the SRS sent by different antenna ports and different frequency hopping bandwidths of the terminal device, respectively, and are applicable to scenarios where multiple antenna ports of the terminal device do not have coherence capabilities between multiple frequency hoppings. It can be understood that in this embodiment, the first communication device only needs to receive a downlink reference signal sent by a downlink reference signal port, which can reduce the downlink reference signal overhead. And by first estimating the channels on all subcarriers and then calculating the phase difference feedback amount, it is applicable to scenarios where the downlink reference signal and SRS are configured in the same bandwidth but on different subcarriers. Furthermore, it can be combined with a channel estimation algorithm with noise reduction capability. Under low signal-to-noise ratio, compared with directly calculating the phase difference of the downlink reference signal, the phase difference feedback amount has higher accuracy, and the feedback overhead is very low, and high-precision phase feedback can be achieved using multiple bits.

Exemplarily, when the terminal device includes at least two first port sets and each first port set includes at least two antenna ports, channel estimation can be performed based on the downlink reference signal received by the antenna port in each first port set, and the estimated channel is spliced and then the phase difference feedback amount is calculated, so that each antenna port in the first port set shares the phase difference feedback amount, thereby reducing feedback overhead.

The following will take the compensation of the SRS random phase difference as an example and explain in detail in conjunction with Figure 9a and Figure 9b. Figure 9a is a scene diagram of a communication method provided by an embodiment of the present application, and Figure 9b is an interaction diagram based on the communication method provided by an embodiment of the present application.

As shown in Figure 9a, taking the 5ms frame structure under the NR communication protocol as an example, the horizontal axis is time, and each square represents a time slot. Among them, "D" represents a downlink slot, "S" represents a special slot, and "U" represents an uplink slot. Assuming that a subframe contains a slot, the D subframe indicates that downlink data can be sent in the subframe, and the S subframe indicates that the special fields DwPTS, GP, and UpPTS are sent in the subframe. The U subframe indicates that uplink data can be sent in the subframe. It can be understood that a subframe containing a slot is only an example provided by this application and is not limited here.

Taking one network device corresponding to one terminal device as an example, the terminal device includes 4 antenna ports (antenna port 0, antenna port 1, antenna port 2, antenna port 3), 2 transmit channels and 4 receive channels. When the first communication device sends SRS, it is necessary to send SRS at two different times by antenna selection. Exemplarily, antenna port 0 and antenna port 1 are used to send SRS at the previous moment, and antenna port 2 and antenna port 3 are used to send SRS at the next moment. Exemplarily, antenna port 0 and antenna port 1 have coherent capabilities and can be included in a first port set, and antenna port 2 and antenna port 3 have coherent capabilities and can be included in another first port set. It should be understood that the number of antenna ports and transmit/receive channel configuration of the terminal device shown in this embodiment is only an example and is not limited here.

As shown in FIG9a, the upward dotted arrow indicates the SRS resources of antenna port 0 and antenna port 1 of the terminal device, the upward solid arrow indicates the SRS resources of antenna port 2 and antenna port 3 of the terminal device, and the downward solid arrow indicates the downlink reference signal resources (such as CSI-RS resources). Under the frame structure of the NR protocol, the downlink reference signal and SRS resources can be configured as follows: for each special slot, SRS resources are configured for antenna ports 0 and 1 and antenna ports 2 and 3 respectively on the last two OFDM symbols (such as configuring SRS resources for antenna ports 0 and 1 on the second-to-last OFDM symbol, and configuring SRS resources for antenna ports 2 and 3 on the first-to-last OFDM symbol), and a downlink reference signal resource of a downlink reference signal port is configured on the third-to-last OFDM symbol, and the SRS and the downlink reference signal are configured on multiple identical frequency domain subcarriers.

Exemplarily, the second communication device indicates the downlink reference signal configuration and SRS configuration to the first communication device, and then indicates the configuration of the phase difference feedback amount in an implicit manner, that is, no additional indication information for indicating the configuration of the phase difference feedback amount (corresponding to the first indication information in the aforementioned embodiment) is sent. Accordingly, the first communication device can determine the configuration of the phase difference feedback amount based on the downlink reference signal configuration and SRS configuration. The specific implementation of the implicit indication can be referred to the relevant introduction of S405 to S407 in the aforementioned embodiment, which will not be repeated here.

Specifically, two phase difference feedback amounts can be configured in this embodiment. The downlink reference signal port set corresponding to the first phase difference feedback amount (corresponding to the second port set in the aforementioned embodiment) is the downlink reference signal port of the third-to-last OFDM symbol, the corresponding SRS antenna port set (corresponding to the first port set in the aforementioned embodiment) is antenna ports 0 and 1, and the corresponding frequency index set (corresponding to the first frequency domain position set in the aforementioned embodiment) is the subcarrier index set of the downlink reference signal and SRS configuration (corresponding to the second frequency domain position set and the third frequency domain position set in the aforementioned embodiment). Exemplarily, the first frequency domain position set can be the intersection of the subcarrier index set of the downlink reference signal configuration and the subcarrier index set of the SRS configuration. The downlink reference signal port set and frequency index set corresponding to the second phase difference feedback amount are the same as the first phase difference feedback amount, and the corresponding SRS antenna port set is antenna ports 2 and 3.

The method is further described below by taking the phase difference feedback amount calculated based on the phase of the cross-correlation of the channel estimated at different times as an example. Please refer to FIG. 9b. Based on the application scenario shown in FIG. 9a, the method may include the following steps:

S901: The second communication device sends a downlink reference signal at a first time and a second time based on a downlink reference signal port. Correspondingly, the first communication device receives a downlink reference signal at a first time and a second time based on antenna ports 0 and 1.

It can be understood that the time between the time when the second communication device sends the downlink reference signal and the time when the first communication device receives the downlink reference signal There is a delay. For the convenience of description, the instant of sending a downlink reference signal and the instant of receiving the downlink reference signal are described as the first instant and the second instant.

S902: The first communication device calculates a phase difference feedback amount based on downlink reference signals received by antenna ports 0 and 1 at the first time and the second time.

Exemplarily, the first communication device performs channel estimation on the downlink channels corresponding to antenna ports 0 and 1 based on the downlink reference signals received by antenna ports 0 and 1 at the first time and the second time, and obtains the downlink channel of antenna port 0 and the downlink channel of antenna port 1 h ^PORT0 ,h ^PORT1 , and splices h ^PORT0 and h ^PORT1 into a vector h, then h can satisfy the following relationship:
h＝[(h ^PORT0 ) ^T ,(h ^PORT1 ) ^T ] ^T

Among them, (h ^PORT0 ) ^T is the transpose of h ^PORT0 , and (h ^PORT1 ) ^T is the transpose of h ^PORT1 .

It can be understood that, assuming that the splicing vectors corresponding to the two moments can be h ₁ and h ₂ respectively, the above phase difference feedback amount δ can satisfy the following relationship:

Among them, the arg function is used to take the phase of the complex number, is the row vector obtained by conjugate transpose of h ₁ , Indicates taking The phase of the inner product with h ₂ , correspondingly, the first communication device feedback The phase of the inner product with h ₂ .

S903: The first communication device sends the phase difference feedback value to the second communication device. Correspondingly, the second communication device receives the phase difference feedback value.

Regarding the specific implementation of S903, reference may be made to the relevant introduction of S402 or S502 in the aforementioned embodiments, and will not be elaborated here.

S904: The first communication device sends SRS to the second communication device at the third time and the fourth time based on antenna ports 0 and 1. Correspondingly, the second communication device receives SRS at the third time and the fourth time based on the downlink reference signal port.

Regarding the specific implementation of S904, reference may be made to the relevant introduction of S403 or S503 in the aforementioned embodiments, and will not be elaborated here.

S905: The second communication device calculates the phase difference information of the uplink channel based on the SRS at the third time and the fourth time received by the downlink reference signal port.

It can be understood that the second communication device can perform channel estimation on the uplink channels corresponding to antenna port 0 and antenna port 1 based on the SRS at the third moment and the fourth moment, respectively, and splice the channel estimation results of the two ports at the same moment, and correspondingly calculate the phase difference information of the spliced channel at the third moment and the fourth moment. The specific implementation of calculating the phase difference information can be referred to the relevant introduction of S603 in the aforementioned embodiment, which will not be repeated here.

S906: The second communication device determines and compensates for the SRS random phase difference based on the phase difference information of the uplink channel and the phase difference feedback amount.

For the specific implementation of S906, reference may be made to the relevant introduction of S607 in the aforementioned embodiment, which will not be elaborated here.

It can be understood that in this embodiment, multiple antenna ports applicable to the terminal device are divided into multiple groups (each group corresponds to a first port set). When the antenna ports in each group have coherence capability, a phase difference feedback amount can be used to solve the common random phase difference of a group of antenna ports. Compared with feeding back a phase difference feedback amount for each antenna port, shared phase difference feedback amount can be achieved, and the feedback overhead is lower.

The device embodiments of the present application will be introduced below.

The present application divides the functional modules of the communication device according to the above method embodiment. For example, each functional module can be divided according to each function, or two or more functions can be integrated into one processing module. The above integrated modules can be implemented in the form of hardware or in the form of software functional modules. It should be noted that the division of modules in the present application is schematic and is only a logical function division. There may be other division methods in actual implementation. The communication device of the embodiment of the present application will be described in detail below in conjunction with Figures 10 to 12.

FIG10 is a schematic diagram of the structure of a communication device provided in an embodiment of the present application. As shown in FIG10 , the communication device includes a processing unit 1003 , a sending unit 1001 and a receiving unit 1002 .

In some embodiments of the present application, the communication device may be the first communication device shown above. That is, the communication device shown in FIG. 10 may be used to execute the steps or functions performed by the first communication device in the above method embodiment. Exemplarily, the first communication device may be a beamforming transmission device or chip, etc., which is not limited in the embodiments of the present application.

The receiving unit 1002 is configured to receive a downlink reference signal from the second communication device;

The sending unit 1001 is configured to send feedback information (or a phase difference feedback amount) to a second communication device.

Optionally, the processing unit 1003 is used to generate feedback information (or phase difference feedback amount). The first indication information. For example, the processing unit 1003 is further configured to process a downlink reference signal to obtain an estimated channel.

Optionally, the processing unit 1003 is further configured to control the sending unit 1001 to output feedback information (or a phase difference feedback amount).

Optionally, the processing unit 1003 is further configured to generate an SRS.

Optionally, the sending unit 1001 is further configured to send an SRS to a second communication device.

It can be understood that the specific description of the feedback information, phase difference feedback amount, downlink reference signal, estimated channel, SRS, first indication information, etc. can refer to the method embodiments shown above, such as the methods shown in Figures 4 to 9b, and will not be described in detail here.

It is understandable that the specific description of the transceiver unit and the processing unit shown in the embodiment of the present application is only an example. For the specific functions or execution steps of the transceiver unit and the processing unit, reference can be made to the above method embodiment, which will not be described in detail here. Exemplarily, the sending unit 1001 can also be used to execute the sending steps in S604 and S606 corresponding to Figure 6, the receiving unit 1002 is also used to execute the receiving steps in S601 and S602 corresponding to Figure 6, and the processing unit 1003 can also be used to execute S603 corresponding to Figure 6.

Reusing Figure 10, in some other embodiments of the present application, the communication device may be the second communication device shown above. That is, the communication device shown in Figure 10 may be used to execute the steps or functions performed by the second communication device in the above method embodiment. Exemplarily, the second communication device may be a beamforming receiving device or chip, etc., which is not limited in the embodiments of the present application.

The sending unit 1001 is configured to send a downlink reference signal to a first communication device;

The receiving unit 1002 is configured to receive feedback information (or a phase difference feedback amount) from a first communication device;

Optionally, the processing unit 1003 is used to generate first indication information.

Optionally, the processing unit 1003 is further configured to generate phase difference information of an uplink channel.

Optionally, the receiving unit 1002 is further configured to receive an SRS from the first communication device, and receive feedback information (or a phase difference feedback amount) from the first communication device.

Optionally, the processing unit 1003 is further configured to process the SRS. For example, the processing unit 1003 may perform channel estimation according to the SRS at the third moment and the fourth moment to determine the above-mentioned phase difference feedback amount.

Optionally, the processing unit 1003 is further configured to determine and compensate for a difference in a random phase of an SRS.

It can be understood that the specific description of the feedback information, phase difference feedback amount, phase difference information of the uplink channel, SRS random phase, downlink reference signal, estimated channel, SRS, first indication information, etc. can refer to the method embodiments shown above, such as the methods shown in Figures 4 to 9b, and will not be described in detail here.

It is understandable that the specific description of the transceiver unit and the processing unit shown in the embodiment of the present application is only an example. For the specific functions or execution steps of the transceiver unit and the processing unit, reference can be made to the above method embodiment, which will not be described in detail here. Exemplarily, the receiving unit 1002 can also be used to execute the receiving steps in S604 and S606 corresponding to Figure 6; the processing unit 1003 can also be used to execute S605 and S607 corresponding to Figure 6, and the sending unit 1001 is also used to execute the sending steps in S601 and S602 corresponding to Figure 6.

The first communication device and the second communication device of the embodiment of the present application are introduced above, and the possible product forms of the first communication device and the second communication device are introduced below. It should be understood that any product having the functions of the first communication device described in FIG. 10 above, or any product having the functions of the second communication device described in FIG. 10 above, falls within the protection scope of the embodiment of the present application. It should also be understood that the following introduction is only an example, and does not limit the product forms of the first communication device and the second communication device of the embodiment of the present application to this.

In the communication device shown in FIG10 , the processing unit 1003 may be one or more processors, the sending unit 1001 may be a transmitter, the receiving unit 1002 may be a receiver, or the sending unit 1001 and the receiving unit 1002 may be integrated into one device, such as a transceiver. Alternatively, the processing unit 1003 may be one or more processors (or the processing unit 1003 may be one or more logic circuits), the sending unit 1001 may be an output interface, the receiving unit 1002 may be an input interface, or the sending unit 1001 and the receiving unit 1002 may be integrated into one unit, such as an input-output interface. This will be described in detail below.

In a possible implementation, in the communication device shown in Figure 10, the processing unit 1003 may be one or more processors, and the sending unit 1001 and the receiving unit 1002 may be integrated into a transceiver. In the embodiment of the present application, the processor and the transceiver may be coupled, etc., and the embodiment of the present application does not limit the connection method between the processor and the transceiver.

As shown in FIG. 11 , the communication device 1100 includes one or more processors 1102 and a transceiver 1101 .

Exemplarily, when the communication device is used to execute the steps, methods or functions executed by the first communication device, the transceiver 1101 is used to send feedback information to the second communication device and receive a downlink reference signal from the second communication device. Optionally, the processor 1102 is used to perform channel estimation according to the downlink reference signal. Optionally, the transceiver 1101 is also used to send an SRS and first indication information to the second communication device.

Exemplarily, when the communication device is used to execute the steps, methods or functions executed by the second communication device, the transceiver 1101 is used to send a downlink reference signal to the first communication device and receive feedback information from the first communication device. For generating the first indication information, the phase difference information of the uplink channel, etc. Optionally, the transceiver 1101 is further configured to receive the SRS from the first communication device, and the first indication information, etc. Optionally, the processor 1102 is further configured to process the SRS.

It can be understood that for the specific description of the processor and the transceiver, reference can also be made to the introduction of the processing unit, the sending unit and the receiving unit shown in FIG. 10 , which will not be repeated here.

In various implementations of the communication device shown in FIG11 , the transceiver may include a receiver and a transmitter, wherein the receiver is used to perform a receiving function (or operation) and the transmitter is used to perform a transmitting function (or operation). The transceiver is used to communicate with other devices/devices via a transmission medium.

Optionally, the communication device 1100 may also include one or more memories 1103 for storing program instructions and/or data. The memory 1103 is coupled to the processor 1102. The coupling in the embodiment of the present application is an indirect coupling or communication connection between devices, units or modules, which may be electrical, mechanical or other forms, and is used for information exchange between devices, units or modules. The processor 1102 may operate in conjunction with the memory 1103. The processor 1102 may execute program instructions stored in the memory 1103. Optionally, at least one of the one or more memories may be included in the processor.

The specific connection medium between the above-mentioned transceiver 1101, processor 1102 and memory 1103 is not limited in the embodiment of the present application. In FIG. 11, the memory 1103, processor 1102 and transceiver 1101 are connected through a bus 1104. The bus is represented by a bold line in FIG. 11. The connection mode between other components is only for schematic illustration and is not limited thereto. The bus can be divided into an address bus, a data bus, a control bus, etc. For ease of representation, only one bold line is used in FIG. 11, but it does not mean that there is only one bus or one type of bus.

In the embodiments of the present application, the processor may be a general-purpose processor, a digital signal processor, an application-specific integrated circuit, a field programmable gate array or other programmable logic device, a discrete gate or transistor logic device, a discrete hardware component, etc., and may implement or execute the methods, steps, and logic block diagrams disclosed in the embodiments of the present application. The general-purpose processor may be a microprocessor or any conventional processor, etc. The steps of the method disclosed in the embodiments of the present application may be directly embodied as being executed by a hardware processor, or may be executed by a combination of hardware and software modules in the processor, etc.

In the embodiments of the present application, the memory may include, but is not limited to, non-volatile memories such as hard disk drive (HDD) or solid-state drive (SSD), random access memory (RAM), erasable programmable read-only memory (EPROM), read-only memory (ROM) or portable read-only memory (CD-ROM), etc. The memory is any storage medium that can be used to carry or store program codes in the form of instructions or data structures and can be read and/or written by a computer (such as the communication device shown in the present application), but is not limited to this. The memory in the embodiments of the present application can also be a circuit or any other device that can realize a storage function, which is used to store program instructions and/or data.

The processor 1102 is mainly used to process the communication protocol and communication data, and to control the entire communication device, execute the software program, and process the data of the software program. The memory 1103 is mainly used to store the software program and data. The transceiver 1101 may include a control circuit and an antenna. The control circuit is mainly used to convert the baseband signal and the radio frequency signal and process the radio frequency signal. The antenna is mainly used to send and receive radio frequency signals in the form of electromagnetic waves. The input and output devices, such as a touch screen, a display screen, a keyboard, etc., are mainly used to receive data input by the user and output data to the user.

When the communication device is turned on, the processor 1102 can read the software program in the memory 1103, interpret and execute the instructions of the software program, and process the data of the software program. When data needs to be sent wirelessly, the processor 1102 performs baseband processing on the data to be sent, and outputs the baseband signal to the radio frequency circuit. The radio frequency circuit performs radio frequency processing on the baseband signal and then sends the radio frequency signal outward in the form of electromagnetic waves through the antenna. When data is sent to the communication device, the radio frequency circuit receives the radio frequency signal through the antenna, converts the radio frequency signal into a baseband signal, and outputs the baseband signal to the processor 1102. The processor 1102 converts the baseband signal into data and processes the data.

In another implementation, the RF circuit and antenna may be arranged independently of the processor performing baseband processing. For example, in a distributed scenario, the RF circuit and antenna may be arranged independently of the communication device in a remote manner.

It is understandable that the communication device shown in the embodiment of the present application may also have more components than those in FIG11, and the embodiment of the present application is not limited to this. The method performed by the processor and transceiver shown above is only an example, and the specific steps performed by the processor and transceiver can refer to the method described above.

In another possible implementation, in the communication device shown in FIG. 10, the processing unit 1003 may be one or more logic circuits. The sending unit 1001 may be an output interface, and the receiving unit 1002 may be an input interface. Alternatively, the sending unit 1001 and the receiving unit 1002 may be integrated into one unit, such as an input-output interface. The input-output interface may also be called a communication interface, or an interface circuit, or an interface, etc. As shown in FIG12 , the communication device shown in FIG12 includes a logic circuit 1201 and an interface 1202. That is, the above-mentioned processing unit 801 may be implemented with a logic circuit 1201, and the sending unit 1001 and the receiving unit 1002 may be implemented with an interface 1202. Among them, the logic circuit 1201 may be a chip, a processing circuit, an integrated circuit or a system on chip (SoC) chip, etc., and the interface 1202 may be a communication interface, an input-output interface, a pin, etc. Exemplarily, FIG12 is shown by taking the above-mentioned communication device as a chip as an example, and the chip includes a logic circuit 1201 and an interface 1202.

In the embodiment of the present application, the logic circuit and the interface may also be coupled to each other. The embodiment of the present application does not limit the specific connection method between the logic circuit and the interface.

Exemplarily, when the communication device is used to execute the method, function or step executed by the first communication device, the interface 1202 is used to output feedback information and input a downlink reference signal.

Optionally, the logic circuit 1201 is used to perform channel estimation etc. according to the downlink reference signal.

Optionally, the logic circuit 1201 is further used to generate an SRS, and the interface 1202 is further used to output the SRS.

Exemplarily, when the communication device is used to execute the method, function or step executed by the second communication device, the interface 1202 is used to input feedback information and output a downlink reference signal. Optionally, the logic circuit 1201 is used to generate a downlink reference signal. Optionally, the interface 1202 is also used to input feedback information, and the logic circuit 1201 is also used to process the feedback information. Optionally, the interface 1202 is also used to input SRS, and the logic circuit 1201 is also used to process the SRS (such as performing channel estimation based on the SRS, etc.).

It can be understood that the communication device shown in the embodiment of the present application can implement the method provided in the embodiment of the present application in the form of hardware, or can implement the method provided in the embodiment of the present application in the form of software, etc., and the embodiment of the present application is not limited to this.

It can be understood that the specific description of the feedback information, phase difference feedback amount, phase difference information of the uplink channel, SRS random phase, downlink reference signal, estimated channel, SRS, etc. can refer to the method embodiments shown above, such as the methods shown in Figures 4 to 9b, and will not be described in detail here.

For the specific implementation methods of each embodiment shown in FIG. 12 , reference may also be made to the above embodiments, which will not be described in detail here.

In addition, the present application also provides a computer program, which is used to implement the operations and/or processing performed by the first communication device in the method provided by the present application.

The present application also provides a computer program, which is used to implement the operations and/or processing performed by the second communication device in the method provided by the present application.

The present application also provides a computer storage medium, in which a computer program is stored. The computer program includes program instructions. When the program instructions are executed by a processor, the processor executes the operations and/or processing performed by the first communication device in the method provided in the present application.

The present application also provides a computer storage medium, in which a computer program is stored. The computer program includes program instructions. When the program instructions are executed by a processor, the processor executes the operations and/or processing performed by the second communication device in the method provided in the present application.

The present application also provides a computer program product, which includes a computer program or a computer code. When the computer program or the computer code runs on a computer, the operations and/or processing performed by the first communication device in the method provided by the present application are executed.

The present application also provides a computer program product, which includes a computer program or a computer code. When the computer program or the computer code runs on a computer, the operations and/or processing performed by the second communication device in the method provided by the present application are executed.

The present application also provides a communication system, including a terminal device and a network device, wherein the terminal device and the network device can be used to execute the method in any of the aforementioned embodiments.

In the several embodiments provided in the present application, it should be understood that the disclosed systems, devices and methods can be implemented in other ways. For example, the device embodiments described above are only schematic. For example, the division of the units is only a logical function division. There may be other division methods in actual implementation, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. In addition, the mutual coupling or direct coupling or communication connection shown or discussed can be an indirect coupling or communication connection through some interfaces, devices or units, or it can be an electrical, mechanical or other form of connection.

The units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the technical effects of the solutions provided in the embodiments of the present application.

In addition, each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit. The above-mentioned integrated unit may be implemented in the form of hardware or in the form of software functional units.

If the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present application is essentially or the part that contributes to the prior art, or all or part of the technical solution can be embodied in the form of a software product, and the computer software product is stored in a readable storage medium, including a number of instructions to enable a computer device (which can be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the method described in each embodiment of the present application. The aforementioned readable storage medium includes: U disk, mobile hard disk, read-only memory (ROM), random access memory (RAM), disk or optical disk and other media that can store program codes.

Claims

A communication method, characterized in that the method comprises:

Based on at least one first port set, receiving a downlink reference signal at a first time and a second time, respectively; the first port set includes one or more antenna ports;

Send feedback information, where the feedback information is used to indicate multiple phase difference feedback amounts; each of the phase difference feedback amounts corresponds to one of the at least one first port set; and the phase difference feedback amount is used to indicate the phase difference information between the downlink reference signal received by the corresponding antenna port in the first port set at the first moment and the second moment.
The method according to claim 1, characterized in that the phase difference feedback amount is used to indicate the phase difference information between the downlink reference signal received by the antenna port in the first port set corresponding to it at the first time and the second time, including at least one of the following:

The phase difference feedback amount is used to indicate the phase difference information between the downlink reference signals received by the corresponding antenna port in the first port set at the first time and the second time; the phase difference information between the downlink reference signals is the cross-correlation phase information of the downlink reference signals received by the antenna port in the first port set at the first time and the second time;

The phase difference feedback amount is used to indicate the phase difference information between the channels of the corresponding antenna port in the first port set at the first moment and the second moment; the phase difference information between the channels is the phase information of the cross-correlation between the channel at the first moment and the channel at the second moment; the channel at the first moment is determined based on the downlink reference signal received by the antenna port in the first port set at the first moment, and the channel at the second moment is determined based on the downlink reference signal received by the antenna port in the first port set at the second moment.
The method according to claim 1 or 2, characterized in that the method further comprises:

Based on the at least one first port set, an SRS is sent at a third moment and a fourth moment; the time interval between the first moment and the third moment is a first time difference, and the time interval between the second moment and the fourth moment is a second time difference; the phase difference feedback amount corresponds to one third moment and one fourth moment.
The method according to claim 3, characterized in that the first time difference is less than a first threshold, and the second time difference is less than the first threshold;

Alternatively, the first time difference is less than or equal to the first threshold, and the second time difference is less than or equal to the first threshold.
The method according to claim 4, characterized in that the first threshold satisfies any one of the following:

The first threshold is equal to one quarter of the third time difference, and the third time difference is the time interval between the third moment and the fourth moment;

The first threshold is equal to one fifth of the third time difference;

The first threshold is equal to one eighth of the third time difference;

The first threshold is equal to a time of 5 time slots;

The first threshold is equal to the time of 2 time slots;

The first threshold is equal to the time of 1 time slot.
The method according to any one of claims 1 to 5 is characterized in that the phase difference feedback amount is used to compensate for the difference between the random phase corresponding to the SRS sent at the third moment and the random phase corresponding to the SRS sent at the fourth moment.
The method according to any one of claims 1 to 6, characterized in that the phase difference feedback amount corresponds to a second port set; the second port set includes one or more downlink reference signal ports;

The phase difference feedback amount corresponds to a first frequency domain position set or corresponds to a first frequency domain basis set; the first frequency domain position set includes one or more frequency domain positions, and the first frequency domain basis set includes one or more frequency domain basis.
The method according to any one of claims 1 to 7, characterized in that any two of the multiple phase difference feedback amounts satisfy at least one of the following:

The first port sets corresponding to any two of the phase difference feedback amounts are different;

The second port sets corresponding to any two of the phase difference feedback quantities are different;

The first frequency domain position sets or first frequency domain basis sets corresponding to any two of the phase difference feedback amounts are different.
The method according to any one of claims 1 to 8, characterized in that the transmit antenna port set corresponding to the downlink reference signal at the first moment includes the second port set, and the transmit antenna port set corresponding to the downlink reference signal at the second moment includes the second port set;

The frequency domain bandwidth corresponding to the downlink reference signal at the first moment includes a bandwidth corresponding to the first frequency domain position set or a bandwidth corresponding to the first frequency domain basis set, and the frequency domain bandwidth corresponding to the downlink reference signal at the second moment includes a bandwidth corresponding to the first frequency domain position set or a bandwidth corresponding to the first frequency domain basis set;

The transmitting antenna port set corresponding to the SRS at the third moment includes the first port set, and the transmitting antenna port set corresponding to the SRS at the fourth moment includes the first port set;

The frequency domain bandwidth corresponding to the SRS at the third moment includes the bandwidth corresponding to the first frequency domain position set or the bandwidth corresponding to the first frequency domain basis set, and the frequency domain bandwidth corresponding to the SRS at the fourth moment includes the bandwidth corresponding to the first frequency domain position set or the bandwidth corresponding to the first frequency domain basis set.
The method according to any one of claims 1 to 9, characterized in that the method further comprises:

Receive first indication information; or send the first indication information; the first indication information is used to indicate any one or more of the first port set, the second port set, the first frequency domain position set or the first frequency domain basis set corresponding to the phase difference feedback amount.
The method according to any one of claims 1 to 9, characterized in that the method further comprises:

The first port set is determined based on SRS port information; the SRS port information is information about a transmitting antenna port set corresponding to the SRS at the third moment and a transmitting antenna port set corresponding to the SRS at the fourth moment.
The method according to any one of claims 1 to 9 or 11, characterized in that the method further comprises:

Determine the second port set based on downlink reference signal port information; the downlink reference signal port information is information of a transmit antenna port set corresponding to the downlink reference signal at the first moment and a transmit antenna port set corresponding to the downlink reference signal at the second moment;

Determine the first frequency domain position set based on the second frequency domain position set and the third frequency domain position set; the second frequency domain position set is one or more frequency domain positions corresponding to the SRS at the third moment and the fourth moment, and the third frequency domain position set is one or more frequency domain positions corresponding to the downlink reference signal at the first moment and the second moment;

Alternatively, the first frequency domain basis set is determined based on the second frequency domain basis set and the third frequency domain basis set; the second frequency domain basis set is one or more frequency domain basis sets corresponding to the SRS at the third moment and the fourth moment, and the third frequency domain basis set is one or more frequency domain basis sets corresponding to the downlink reference signal at the first moment and the second moment.
The method according to any one of claims 1 to 12, characterized in that, when the first port set includes multiple antenna ports, any two antenna ports in the first port set have coherence capability;

In the case where the second port set includes a plurality of downlink reference signal ports, any two downlink reference signal ports in the second port set have coherence capability.
The method according to any one of claims 1 to 13 is characterized in that the downlink reference signal includes any one of a channel state information reference signal CSI-RS, a tracking reference signal TRS, a phase tracking reference signal PT-RS and a demodulation reference signal DM-RS.
A communication method, characterized in that the method comprises:

Based on at least one second port set, sending a downlink reference signal at a first time and a second time, respectively; the second port set includes one or more downlink reference signal ports;

Receive feedback information, where the feedback information is used to indicate multiple phase difference feedback amounts; the phase difference feedback amount is used to indicate the phase difference information between the downlink reference signal received by the antenna port in the corresponding first port set at the first moment and the second moment; the first port set includes one or more antenna ports; each of the phase difference feedback amounts corresponds to one of the at least one first port set.
The method according to claim 15, characterized in that the phase difference feedback amount is used to indicate the corresponding first port set The phase difference information between the downlink reference signal received by the antenna port at the first time and the second time includes at least one of the following:

The phase difference feedback amount is used to indicate the phase difference information between the downlink reference signals received by the corresponding antenna port in the first port set at the first time and the second time; the phase difference information between the downlink reference signals is the cross-correlation phase information of the downlink reference signals received by the antenna port in the first port set at the first time and the second time;

The phase difference feedback amount is used to indicate the phase difference information between the channels of the corresponding antenna port in the first port set at the first moment and the second moment; the phase difference information between the channels is the phase information of the cross-correlation between the channel at the first moment and the channel at the second moment; the channel at the first moment is determined based on the downlink reference signal received by the antenna port in the first port set at the first moment, and the channel at the second moment is determined based on the downlink reference signal received by the antenna port in the first port set at the second moment.
The method according to claim 15 or 16, characterized in that the method further comprises:

SRS is received at a third moment and a fourth moment; the time interval between the first moment and the third moment is a first time difference, and the time interval between the second moment and the fourth moment is a second time difference; the phase difference feedback amount corresponds to one third moment and one fourth moment.
The method according to claim 17, characterized in that the first time difference is less than a first threshold, and the second time difference is less than the first threshold;

Alternatively, the first time difference is less than or equal to the first threshold, and the second time difference is less than or equal to the first threshold.
The method according to claim 18, characterized in that the first threshold satisfies any one of the following:

The first threshold is equal to one quarter of the third time difference, and the third time difference is the time interval between the third moment and the fourth moment;

The first threshold is equal to one fifth of the third time difference;

The first threshold is equal to one eighth of the third time difference;

The first threshold is equal to a time of 5 time slots;

The first threshold is equal to the time of 2 time slots;

The first threshold is equal to the time of 1 time slot.
The method according to any one of claims 15 to 19 is characterized in that the phase difference feedback amount is used to compensate for the difference between the random phase corresponding to the SRS received at the third moment and the random phase corresponding to the SRS received at the fourth moment.
The method according to any one of claims 15 to 20, characterized in that the phase difference feedback amount corresponds to a second port set in the at least one second port set;

The phase difference feedback amount corresponds to a first frequency domain position set or corresponds to a first frequency domain basis set; the first frequency domain position set includes one or more frequency domain positions, and the first frequency domain basis set includes one or more frequency domain basis.
The method according to any one of claims 15 to 21, characterized in that any two of the multiple phase difference feedback quantities satisfy at least one of the following:

The first port sets corresponding to any two of the phase difference feedback amounts are different;

The second port sets corresponding to any two of the phase difference feedback amounts are different;

The first frequency domain position sets or first frequency domain basis sets corresponding to any two of the phase difference feedback amounts are different.
The method according to any one of claims 15 to 22, characterized in that the transmit antenna port set corresponding to the downlink reference signal at the first moment includes the second port set, and the transmit antenna port set corresponding to the downlink reference signal at the second moment includes the second port set;

The frequency domain bandwidth corresponding to the downlink reference signal at the first moment includes a bandwidth corresponding to the first frequency domain position set or a bandwidth corresponding to the first frequency domain basis set, and the frequency domain bandwidth corresponding to the downlink reference signal at the second moment includes a bandwidth corresponding to the first frequency domain position set or a bandwidth corresponding to the first frequency domain basis set;

The transmitting antenna port set corresponding to the SRS at the third moment includes the first port set, and the transmitting antenna port set corresponding to the SRS at the fourth moment includes the first port set. The transmitting antenna port set includes the first port set;

The frequency domain bandwidth corresponding to the SRS at the third moment includes the bandwidth corresponding to the first frequency domain position set or the bandwidth corresponding to the first frequency domain basis set, and the frequency domain bandwidth corresponding to the SRS at the fourth moment includes the bandwidth corresponding to the first frequency domain position set or the bandwidth corresponding to the first frequency domain basis set.
The method according to any one of claims 15 to 23, characterized in that the method comprises:

Sending first indication information, or receiving the first indication information; the first indication information is used to indicate any one or more of the first port set, the second port set, the first frequency domain position set, or the first frequency domain basis set corresponding to the phase difference feedback amount.
The method according to any one of claims 15 to 24, characterized in that, when the first port set includes multiple antenna ports, any two antenna ports in the first port set have coherence capability;

In the case where the second port set includes a plurality of downlink reference signal ports, any two downlink reference signal ports in the second port set have coherence capability.
The method according to any one of claims 15 to 25 is characterized in that the downlink reference signal includes any one of CSI-RS, TRS, PT-RS and DM-RS.
A communication device, characterized by comprising a unit for executing the method as claimed in any one of claims 1 to 26.
A communication device, characterized in that the device comprises a memory and a processor;

The memory is used to store programs;

The processor is used to execute the program stored in the processor. When the program is executed by the processor, the processor executes the method as described in any one of claims 1 to 14; or, the processor executes the method as described in any one of claims 15 to 26.
A communication device, characterized in that the device comprises a logic circuit and an interface, wherein the logic circuit is coupled to the interface;

The interface is used to input and/or output code instructions, and the logic circuit is used to execute the code instructions. When the code instructions are executed by the logic circuit, the logic circuit executes the method as claimed in any one of claims 1 to 14; or, the logic circuit executes the method as claimed in any one of claims 15 to 26.
A computer storage medium, characterized in that a computer program is stored in the computer storage medium, and the computer program includes program instructions. When the program instructions are executed by a processor, the processor executes the method as claimed in any one of claims 1 to 14; or the processor executes the method as claimed in any one of claims 15 to 26.
A computer program product, characterized in that the computer program product comprises a computer program or a computer code, and when the computer program or the computer code is run on a computer, the method according to any one of claims 1 to 26 is executed.
A communication system, characterized in that it includes a terminal device and a network device, wherein the terminal device is used to execute the method as claimed in any one of claims 1 to 14, and the network device is used to execute the method as claimed in any one of claims 15 to 26.