CN113556772B

CN113556772B - Channel prediction method and device

Info

Publication number: CN113556772B
Application number: CN202010337786.1A
Authority: CN
Inventors: 秦一平; 王勃
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2020-04-26
Filing date: 2020-04-26
Publication date: 2023-10-20
Anticipated expiration: 2040-04-26
Also published as: CN113556772A; WO2021218891A1

Abstract

The application provides a channel prediction method and a device. Comprising the following steps: and carrying out channel prediction according to the estimated value and the measurement information of the channel coefficient corresponding to each SRS of the subframe before the t subframe received from the terminal equipment, obtaining the estimated value of the channel coefficient corresponding to the SRS of the t subframe, carrying out channel estimation according to the SRS of the t subframe received from the terminal equipment, carrying out timing adjustment quantity compensation and phase compensation on the estimated value of the channel coefficient corresponding to the SRS of the t subframe according to the estimated value of the channel coefficient corresponding to the SRS of the t subframe, obtaining the estimated value of the channel coefficient corresponding to the SRS of the t subframe after the first compensation, carrying out channel prediction according to the estimated value of the channel coefficient corresponding to the SRS of the t subframe and the estimated value of the channel coefficient corresponding to the second compensation after the SRS of the subframe before the t subframe, and obtaining the channel coefficient at the downlink signal transmitting moment after the SRS of the t subframe is received.

Description

Channel prediction method and device

Technical Field

The present application relates to the field of communications technologies, and in particular, to a channel prediction method and apparatus.

Background

With the development of communication technology, a new air interface (NR) of 5G adopts a multi-user multiple-input multiple-output (MU MIMO) technology, and MU MIMO users can multiplex the same time domain resources and frequency domain resources, so as to greatly improve the system capacity. When the spatial freedom is sufficient and the base station knows the downlink channel state information (channel state information, CSI), the base station can avoid inter-user interference by precoding the signal sent to the terminal device, thereby realizing spatial multiplexing. In a time division duplex (time division duplex, TDD) system, a base station estimates uplink CSI depending on a sounding reference signal (sounding reference signal, SRS) transmitted by a terminal, and applies to downlink precoding according to channel reciprocity. Due to the change of the mobile and communication environments of the terminal, the situation that the channel at the moment of SRS transmission is inconsistent with the channel at the moment of downlink signal transmission, namely the problem of channel outdated, is often caused, so that precoding is not matched with an actual channel, inter-user interference is generated, the system capacity is seriously affected, and the higher the mobile speed of the terminal is, the more serious the problem of channel outdated and capacity loss are caused. In order to reduce the loss caused by the outdated channel, the channel of the downlink signal transmitting moment can be estimated through channel prediction, and the channel prediction specifically predicts the channel coefficient of the future downlink signal transmitting moment according to the estimated value of the channel coefficient of the current moment and the estimated value of the channel coefficient of the historical moment. However, since the SRS transmitted by the terminal device may be affected by random information unknown to the base station, for example, the random information includes a random phase introduced by a terminal power amplifier switch, a radio frequency device, and the like, and a random timing adjustment amount caused by the terminal device automatically adjusting the SRS transmission timing, the estimated value of the channel coefficient may also be affected by the random information accordingly, which results in a decrease in the performance of channel prediction. Therefore, reducing the interference to channel prediction by the random phase and the random timing adjustment is a problem that must be solved when channel prediction is actually used.

In the existing solution, the base station performs estimation and compensation of random timing adjustment and estimation and compensation of phase after channel estimation and before channel prediction, and the specific process is as follows: after obtaining the estimated value of the channel coefficient corresponding to the SRS of the current subframe, the base station firstly carries out timing adjustment compensation on the estimated value of the channel coefficient corresponding to the SRS of the current subframe according to the estimated value of the timing adjustment of the SRS of the current subframe relative to the SRS of the previous subframe, and obtains the estimated value of the channel coefficient after the timing adjustment compensation corresponding to the SRS of the current subframe. And then the base station performs phase compensation on the estimated value of the channel coefficient after the timing adjustment compensation corresponding to the SRS of the current subframe according to the estimated value of the phase difference between the SRS of the current subframe and the SRS of the previous subframe, so as to obtain the estimated value of the channel coefficient after the timing adjustment compensation and the phase compensation corresponding to the SRS of the current subframe.

However, in a real environment, a channel may change over time and be interfered by noise, and interference factors of an estimated value of a timing adjustment amount and an estimated value of a phase difference also include channel change and noise, and the timing adjustment amount compensation and the phase compensation are performed by using the estimated value of the timing adjustment amount and the estimated value of the phase difference which are interfered by the channel change and the noise, so that accuracy is not high, which may result in poor performance of channel prediction.

Disclosure of Invention

The application provides a channel prediction method and a device, which can improve the accuracy of timing adjustment quantity compensation and phase compensation and ensure the performance of channel prediction.

In a first aspect, the present application provides a channel prediction method, including:

after receiving measurement information corresponding to Sounding Reference Signals (SRS) of a t-1 subframe from a terminal device, the network device performs channel prediction according to estimated values and measurement information of channel coefficients corresponding to SRS of subframes before the t subframe to obtain predicted values of channel coefficients corresponding to SRS of the t subframe, the measurement information comprises timing adjustment amount and phase difference, then the network device performs channel estimation according to SRS of the t subframe received from the terminal device to obtain estimated values of channel coefficients corresponding to SRS of the t subframe, then the network device performs timing adjustment amount compensation and phase compensation on estimated values of channel coefficients corresponding to SRS of the t subframe according to the predicted values of channel coefficients corresponding to SRS of the t subframe to obtain estimated values of channel coefficients corresponding to SRS of the first time after compensation of the t subframe, and finally performs channel prediction according to estimated values of channel coefficients corresponding to SRS of the first time after compensation of the t subframe and estimated values of channel coefficients corresponding to SRS of the second time after compensation of subframes before the t subframe to obtain downlink channel coefficients after receiving SRS of the t subframe.

According to the channel prediction method provided by the first aspect, since the measurement information corresponding to the SRS of each subframe is transmitted by the terminal device after each SRS is transmitted, and is delayed, the network device performs channel prediction according to the estimated value and the measurement information of the channel coefficient corresponding to each SRS of the subframes before the t subframe to obtain the estimated value of the channel coefficient corresponding to the SRS of the t subframe, then performs timing adjustment compensation and phase compensation on the estimated value of the channel coefficient corresponding to the SRS of the t subframe according to the estimated value of the channel coefficient corresponding to the SRS of the t subframe to obtain the estimated value of the channel coefficient corresponding to the first time compensation of the SRS of the t subframe, and finally performs channel prediction according to the estimated value of the channel coefficient corresponding to the first time compensation of the SRS of the t subframe and the estimated value of the channel coefficient corresponding to the second time compensation of the SRS of the subframes before the t subframe to obtain the channel coefficient at the downlink signal transmission time after receiving the SRS of the t subframe. Because the network device can obtain accurate measurement information corresponding to the SRS of the historical subframe from the terminal device, the measurement information corresponding to the SRS of the historical subframe, that is, the timing adjustment amount and the phase difference of the SRS of each subframe relative to the SRS of the previous subframe, the measurement information corresponding to the SRS of the historical subframe is accurate, the network device performs channel prediction according to the accurate measurement information corresponding to the SRS of the historical subframe and the estimated value of the channel coefficient corresponding to the SRS of the historical subframe, obtains the predicted value of the channel coefficient corresponding to the SRS of the current (t) subframe, and then performs timing adjustment amount compensation and phase compensation on the estimated value of the channel coefficient corresponding to the SRS of the current subframe by using the predicted value of the channel coefficient corresponding to the SRS of the current subframe, which is equivalent to separating the change of the channel itself with time when estimating the timing adjustment amount and the phase difference, and can reduce the influence caused by the delay of the measurement information, thereby improving the accuracy of the timing adjustment amount compensation and the phase compensation, and guaranteeing the performance of the channel prediction.

In one possible design, the method of this embodiment may further include: the network equipment receives measurement information corresponding to SRS of the t subframe, performs timing adjustment quantity compensation and phase compensation on the estimated value of the channel coefficient corresponding to the SRS of the t subframe according to the measurement information corresponding to the SRS of the t subframe and the measurement information corresponding to each SRS of the subframes before the t subframe, obtains the estimated value of the channel coefficient after second compensation corresponding to the SRS of the t subframe, and continues channel prediction according to the estimated value of the channel coefficient after second compensation corresponding to the SRS of the t subframe and the estimated value of the channel coefficient after second compensation corresponding to each SRS of the subframes before the t subframe, and obtains the channel coefficient at the downlink signal transmitting time after receiving the measurement information corresponding to the SRS of the t subframe.

According to the channel prediction method provided by the embodiment, when the network equipment receives the measurement information corresponding to the SRS of the t subframe, the network equipment directly performs timing adjustment quantity compensation and phase compensation on the estimated value of the channel coefficient corresponding to the SRS of the t subframe according to the measurement information corresponding to the SRS of the t subframe and the measurement information corresponding to each SRS of the subframes before the t subframe, and because the measurement information corresponding to the SRS of the t subframe and the measurement information corresponding to each SRS of the subframes before the t subframe are measured by the terminal equipment, the network equipment performs timing adjustment quantity compensation and phase compensation on the estimated value of the channel coefficient corresponding to the SRS of the t subframe according to the accurate measurement information corresponding to the SRS of the t subframe and the measurement information corresponding to each SRS of the subframes before the t subframe, so that the accuracy of the timing adjustment quantity compensation and the phase compensation can be ensured, and the channel prediction performance can be further ensured. Because the measurement information corresponding to the SRS of each subframe is sent after the SRS and is delayed, the network equipment performs timing adjustment quantity compensation and phase compensation on the estimated value of the channel coefficient corresponding to the SRS of the t subframe according to the predicted value of the channel coefficient corresponding to the SRS of the t subframe, so that the accuracy of the timing adjustment quantity compensation and the phase compensation can be improved, and the network equipment directly performs the timing adjustment quantity compensation and the phase compensation on the estimated value of the channel coefficient corresponding to the SRS of the t subframe according to the measurement information corresponding to the SRS of the t subframe and the measurement information corresponding to the SRS of the subframe before the t subframe after receiving the measurement information corresponding to the SRS of the t subframe. Therefore, the influence caused by the delay of the measurement information can be reduced, and the performance of channel prediction is further ensured.

In one possible design, the network device performs channel prediction according to the estimated value and the measurement information of the channel coefficient corresponding to each SRS of the subframe before the t subframe to obtain the predicted value of the channel coefficient corresponding to the SRS of the t subframe, which may specifically be:

the network equipment performs timing adjustment compensation and phase compensation on the estimated value of the channel coefficient corresponding to the SRS of the t-1 th subframe according to the measurement information corresponding to the SRS of the subframe before the t-1 th subframe to obtain the estimated value of the channel coefficient corresponding to the SRS of the t-1 th subframe after the second compensation, stores the estimated value of the channel coefficient corresponding to the SRS of the t-1 th subframe after the second compensation, and performs channel prediction according to N of the estimated values of the channel coefficient corresponding to the SRS of the subframe before the t-1 th subframe to obtain the predicted value of the channel coefficient corresponding to the SRS of the t-1 th subframe, wherein N is a preset positive integer, and the estimated value of the channel coefficient corresponding to the SRS of the N subframes after the second compensation comprises the estimated value of the channel coefficient corresponding to the SRS of the t-1 th subframe after the second compensation.

According to the channel prediction method provided by the embodiment, the estimated values of the channel coefficients after the second compensation corresponding to the SRS of the N subframes are set to be N nearest to the t subframe, so that on one hand, the complexity of S for channel prediction can be reduced, and on the other hand, the performance of channel prediction can be guaranteed.

In one possible design, the network device performs timing adjustment compensation and phase compensation on the estimated value of the channel coefficient corresponding to the SRS of the t-1 th subframe according to the measurement information corresponding to the SRS of the subframe before the t-1 th subframe, to obtain the estimated value of the channel coefficient corresponding to the SRS of the t-1 th subframe after the second compensation, where the estimated value may be:

the network equipment performs timing adjustment amount compensation on the estimated value of the channel coefficient corresponding to the SRS of the t-1 sub-frame according to the historical accumulated timing adjustment amount to obtain the estimated value of the channel coefficient after the timing adjustment amount compensation corresponding to the SRS of the t-1 sub-frame, wherein the historical accumulated timing adjustment amount is the sum of the timing adjustment amounts corresponding to the SRS of the sub-frames before the t sub-frame;

the network equipment performs phase compensation on the estimated value of the channel coefficient after the timing adjustment compensation corresponding to the SRS of the t-1 sub-frame according to the historical accumulated phase difference to obtain the estimated value of the channel coefficient after the second compensation corresponding to the SRS of the t-1 sub-frame, wherein the historical accumulated phase difference is the sum of the phase differences corresponding to the SRS of the sub-frames before the t sub-frame.

In one possible design, the network device performs timing adjustment compensation and phase compensation on the estimated value of the channel coefficient corresponding to the SRS of the t subframe according to the predicted value of the channel coefficient corresponding to the SRS of the t subframe, to obtain the estimated value of the channel coefficient corresponding to the SRS of the t subframe after the first compensation, which may be:

The network equipment determines the estimated value of the timing adjustment quantity of the t sub-frame and the t-1 sub-frame according to the predicted value of the channel coefficient corresponding to the SRS of the t sub-frame and the estimated value of the channel coefficient corresponding to the SRS of the t sub-frame, then performs timing adjustment quantity compensation on the estimated value of the channel coefficient corresponding to the SRS of the t sub-frame according to the estimated value of the timing adjustment quantity of the t sub-frame and the estimated value of the timing adjustment quantity corresponding to the SRS of the t sub-frame, obtains the estimated value of the channel coefficient after the timing adjustment quantity compensation corresponding to the SRS of the t sub-frame, then determines the estimated value of the phase difference of the t sub-frame and the t-1 sub-frame according to the estimated value of the phase difference of the t sub-frame and the t-1 sub-frame, and finally performs phase compensation on the estimated value of the channel coefficient after the timing adjustment quantity compensation corresponding to the SRS of the t sub-frame to obtain the estimated value of the channel coefficient after the first compensation corresponding to the SRS of the t sub-frame.

In one possible design, the network device performs timing adjustment compensation on the estimated value of the channel coefficient corresponding to the SRS of the t-1 th subframe according to the historical accumulated timing adjustment, and the obtained estimated value of the channel coefficient after the timing adjustment compensation corresponding to the SRS of the t-1 th subframe may be:

The network device calculates a historical cumulative timing adjustment amount according to a timing adjustment amount Δτ (n) corresponding to SRS of a subframe preceding the t-th subframe, n=1, 2, …, t-1The network device is according to->Performing timing adjustment amount compensation on the estimated value of the channel coefficient corresponding to the SRS of the t-1 sub-frame by the following formula to obtain the estimated value of the channel coefficient after the timing adjustment amount compensation corresponding to the SRS of the t-1 sub-frame->

K is the total of SRSNumber of subcarriers;

wherein H is _k (t-1) is an estimated value of a channel coefficient corresponding to the SRS of the t-1 th subframe.

In one possible design, the network device performs phase compensation on the estimated value of the channel coefficient compensated by the timing adjustment corresponding to the SRS of the t-1 th subframe according to the historical accumulated phase difference, to obtain the estimated value of the channel coefficient compensated by the SRS of the t-1 th subframe for the second time, which may be:

the network equipment uses the phase difference corresponding to SRS of the subframe before the t-th subframeCalculating the cumulative phase difference +.>

Network equipment is according toEstimated value +.of channel coefficient after compensating timing adjustment amount corresponding to SRS of t-1 sub-frame by the following formula>Performing phase compensation to obtain estimated value ++of channel coefficient after second compensation corresponding to SRS of t-1 sub-frame >

In one possible design, the network device performs channel prediction according to N of the estimated values of the channel coefficients after the second compensation corresponding to the SRS of the subframe before the t subframe, to obtain the predicted value of the channel coefficient corresponding to the SRS of the t subframe, which may be:

the network equipment corresponds to the SRS of the subframe before the t subframeEstimation value of channel coefficient after second compensationChannel prediction is performed on n=1, 2, …, t-1, k=0, 1, …, K-1, and a predicted value of a channel coefficient corresponding to SRS of the t-th subframe is obtained>

In one possible design, the network device performs timing adjustment compensation on the estimated value of the channel coefficient corresponding to the SRS of the t subframe according to the estimated values of the timing adjustment amounts of the t subframe and the t-1 subframe, to obtain the estimated value of the channel coefficient after the timing adjustment amount compensation corresponding to the SRS of the t subframe, which may be:

the network equipment estimates the timing adjustment quantity according to the t-th subframe and the t-1 th subframeEstimating the channel coefficient H corresponding to SRS of the t subframe by the following formula _k (t) compensating the timing adjustment amount to obtain an estimated value of the channel coefficient after the timing adjustment amount compensation corresponding to the SRS of the t sub-frame>

The network device performs phase compensation on the estimated value of the channel coefficient compensated by the timing adjustment corresponding to the SRS of the t subframe according to the estimated value of the phase difference between the t subframe and the t-1 subframe, so as to obtain the estimated value of the channel coefficient compensated for the first time corresponding to the SRS of the t subframe, which may be:

The network equipment estimates the phase difference according to the t-th subframe and the t-1 th subframeBy the following formula pairPerforming phase compensation to obtain an estimated value +_of the channel coefficient after the first compensation corresponding to SRS of the t-th subframe>

In one possible design, the network device determines, according to the predicted value of the channel coefficient corresponding to the SRS of the t subframe and the estimated value of the channel coefficient corresponding to the SRS of the t subframe, the estimated values of the timing adjustment amounts of the t subframe and the t-1 subframe may be:

the network equipment predicts the value of the channel coefficient corresponding to the SRS of the t subframeEstimation value H of channel coefficient corresponding to SRS of t sub-frame _k (t) determining +.>

Wherein ( ^* Representing the complex conjugate.

In one possible design, the network device determines, according to the predicted value of the channel coefficient corresponding to the SRS of the t subframe and the estimated value of the channel coefficient compensated by the timing adjustment amount corresponding to the SRS of the t subframe, an estimated value of the phase difference between the t subframe and the t-1 subframe, where the estimated value may be:

the network equipment predicts the value of the channel coefficient corresponding to the SRS of the t subframeAnd->The +.>

Where angle (·) represents the phase of the complex number.

In a second aspect, the present application provides a network device comprising:

The receiving module is used for receiving measurement information corresponding to a sounding reference signal SRS of a t-1 sub-frame from terminal equipment, wherein the measurement information comprises a timing adjustment amount and a phase difference, and t is more than or equal to 2;

the channel prediction module is used for carrying out channel prediction according to the estimated value and the measurement information of the channel coefficient corresponding to each SRS of the subframe before the t subframe to obtain the predicted value of the channel coefficient corresponding to the SRS of the t subframe;

the receiving module is also used for: receiving an SRS of a t subframe from a terminal device;

the channel estimation module is used for carrying out channel estimation according to the SRS of the t subframe to obtain an estimated value of a channel coefficient corresponding to the SRS of the t subframe;

the processing module is used for carrying out timing adjustment quantity compensation and phase compensation on the estimated value of the channel coefficient corresponding to the SRS of the t subframe according to the predicted value of the channel coefficient corresponding to the SRS of the t subframe, so as to obtain the estimated value of the channel coefficient corresponding to the SRS of the t subframe after the first compensation;

the channel prediction module is further configured to: and carrying out channel prediction according to the estimated value of the channel coefficient after the first compensation corresponding to the SRS of the t subframe and the estimated value of the channel coefficient after the second compensation corresponding to each SRS of the subframes before the t subframe, and obtaining the channel coefficient at the downlink signal transmitting moment after the SRS of the t subframe is received.

In one possible design, the receiving module is further configured to: receiving measurement information corresponding to SRS of a t subframe;

the processing module is also used for: according to the measurement information corresponding to the SRS of the t subframe and the measurement information corresponding to the SRS of the subframe before the t subframe, performing timing adjustment quantity compensation and phase compensation on the estimated value of the channel coefficient corresponding to the SRS of the t subframe to obtain the estimated value of the channel coefficient after the second compensation corresponding to the SRS of the t subframe;

the channel prediction module is further configured to: and continuously carrying out channel prediction according to the estimated value of the channel coefficient after the second compensation corresponding to the SRS of the t subframe and the estimated value of the channel coefficient after the second compensation corresponding to each SRS of the subframes before the t subframe, and obtaining the channel coefficient at the downlink signal transmitting moment after receiving the measurement information corresponding to the SRS of the t subframe.

In one possible design, the channel prediction module includes:

the compensation unit is used for carrying out timing adjustment compensation and phase compensation on the estimated value of the channel coefficient corresponding to the SRS of the t-1 th subframe according to the measurement information corresponding to the SRS of the subframe before the t-1 th subframe, obtaining the estimated value of the channel coefficient after the second compensation corresponding to the SRS of the t-1 th subframe, and storing the estimated value of the channel coefficient after the second compensation corresponding to the SRS of the t-1 th subframe;

And the channel prediction unit is used for carrying out channel prediction according to N of the estimated values of the channel coefficients after the second compensation corresponding to the SRS of the subframe before the t subframe to obtain the predicted value of the channel coefficient corresponding to the SRS of the t subframe, wherein N is a preset positive integer, and the estimated value of the channel coefficient after the second compensation corresponding to the SRS of the N subframes comprises the estimated value of the channel coefficient after the second compensation corresponding to the SRS of the t-1 subframe.

In one possible design, the compensation unit is specifically configured to:

performing timing adjustment amount compensation on the estimated value of the channel coefficient corresponding to the SRS of the t-1 th subframe according to the historical accumulated timing adjustment amount to obtain the estimated value of the channel coefficient after the timing adjustment amount compensation corresponding to the SRS of the t-1 th subframe, wherein the historical accumulated timing adjustment amount is the sum of the timing adjustment amounts corresponding to the SRS of subframes before the t-1 th subframe;

and carrying out phase compensation on the estimated value of the channel coefficient after the timing adjustment compensation corresponding to the SRS of the t-1 sub-frame according to the historical accumulated phase difference to obtain the estimated value of the channel coefficient after the second compensation corresponding to the SRS of the t-1 sub-frame, wherein the historical accumulated phase difference is the sum of the phase differences corresponding to the SRS of the sub-frames before the t sub-frame.

In one possible design, the processing module includes:

a first determining unit, configured to determine an estimated value of the timing adjustment amounts of the t-th subframe and the t-1 th subframe according to the predicted value of the channel coefficient corresponding to the SRS of the t-th subframe and the estimated value of the channel coefficient corresponding to the SRS of the t-th subframe;

the first compensation unit is used for carrying out timing adjustment compensation on the estimated value of the channel coefficient corresponding to the SRS of the t subframe according to the estimated values of the timing adjustment amounts of the t subframe and the t-1 subframe, so as to obtain the estimated value of the channel coefficient after the timing adjustment amount compensation corresponding to the SRS of the t subframe:

a second determining unit for determining an estimated value of the phase difference between the t-th subframe and the t-1 th subframe according to the predicted value of the channel coefficient corresponding to the SRS of the t-th subframe and the estimated value of the channel coefficient compensated by the timing adjustment amount corresponding to the SRS of the t-th subframe;

and the second compensation unit is used for carrying out phase compensation on the estimated value of the channel coefficient after the compensation of the timing adjustment corresponding to the SRS of the t subframe according to the estimated value of the phase difference between the t subframe and the t-1 subframe, so as to obtain the estimated value of the channel coefficient after the first compensation corresponding to the SRS of the t subframe.

In one possible design, the compensation unit is specifically configured to:

Based on the timing adjustment amount Δτ (n) corresponding to the SRS of the subframe before the t-th subframe, n=1, 2, …, t-1, a history accumulated timing adjustment amount is calculated

According toPerforming timing adjustment quantity compensation on the estimated value of the channel coefficient corresponding to the SRS of the t-1 subframe by the following formula to obtain the estimated value of the channel coefficient after the timing adjustment quantity compensation corresponding to the SRS of the t-1 subframe

K is the total subcarrier number of SRS;

In one possible design, the compensation unit is specifically configured to:

according to the phase difference corresponding to SRS of the subframe before the t-th subframeCalculating the cumulative phase difference +.>

According toEstimated value +.of channel coefficient after compensating timing adjustment amount corresponding to SRS of t-1 sub-frame by the following formula>Performing phase compensation to obtain estimated value ++of channel coefficient after second compensation corresponding to SRS of t-1 sub-frame>

In one possible design, the channel prediction unit is specifically configured to:

estimating value of channel coefficient after second compensation according to SRS of subframe before t-th subframeChannel prediction is performed on n=1, 2, …, t-1, k=0, 1, …, K-1, and a predicted value of a channel coefficient corresponding to SRS of the t-th subframe is obtained >

In one possible design, the first compensation unit is specifically configured to:

estimated value of timing adjustment amount according to t-th subframe and t-1 th subframeEstimating the channel coefficient H corresponding to SRS of the t subframe by the following formula _k (t) compensating the timing adjustment amount to obtain an estimated value of the channel coefficient after the timing adjustment amount compensation corresponding to the SRS of the t sub-frame>

The second compensation unit is specifically configured to:

estimation value according to phase difference of t-th subframe and t-1 th subframePair +.>Performing phase compensation to obtain an estimated value +_of the channel coefficient after the first compensation corresponding to SRS of the t-th subframe>

In one possible design, the first determination unit is specifically configured to:

predictive value of channel coefficient corresponding to SRS of t sub-frameEstimation value H of channel coefficient corresponding to SRS of t sub-frame _k (t) determining +.>

Wherein ( ^* Representing the complex conjugate.

In one possible design, the second determination unit is specifically configured to:

predictive value of channel coefficient corresponding to SRS of t sub-frameAnd->Is determined by the following formula

Where angle (·) represents the phase of the complex number.

The advantages of the second aspect and the network device provided in the foregoing second aspect and the possible designs of the second aspect may be referred to the advantages brought by the foregoing first aspect and the possible implementations of the first aspect, which are not described herein again.

In a third aspect, the present application provides a network device comprising: a memory and a processor;

a processor; and

a memory for storing executable instructions of the processor;

wherein the processor is configured to perform the channel prediction method of the first aspect and any one of the possible designs of the first aspect via execution of the executable instructions.

In a fourth aspect, the present application provides a readable storage medium having stored therein execution instructions which, when executed by at least one processor of a network device, perform the channel prediction method of the first aspect and any one of the possible designs of the first aspect.

In a fifth aspect, the present application provides a chip, the chip being connected to a memory or the chip having a memory integrated thereon, the software program stored in the memory, when executed, implementing the channel prediction method of the first aspect and any one of the possible designs of the first aspect.

Drawings

Fig. 1 is a schematic diagram of a wireless communication system architecture to which the present application is applied;

fig. 2 is a schematic diagram of a wireless communication system architecture to which the present application is applicable;

fig. 3 is a schematic diagram of a communication process of a channel prediction method according to the present application;

Fig. 4 is a flowchart of an embodiment of a channel prediction method provided in the present application;

fig. 5 is a schematic diagram of an SRS timing adjustment amount of an SRS t-1 subframe of an SRS t-2 subframe;

fig. 6 is a schematic diagram of channel coefficients corresponding to SRS;

fig. 7 is a flowchart of an embodiment of a channel prediction method provided in the present application;

fig. 8 is a flowchart of an embodiment of a channel prediction method provided in the present application;

FIG. 9 is an interactive flowchart of an embodiment of a channel prediction method provided by the present application;

fig. 10 is a schematic structural diagram of an embodiment of a network device according to the present application;

fig. 11 is a schematic structural diagram of an embodiment of a network device according to the present application;

fig. 12 is a schematic structural diagram of an embodiment of a network device according to the present application;

fig. 13 is a schematic diagram of a network device structure according to the present application.

Detailed Description

In embodiments of the application, the words "exemplary" or "such as" are used to mean that any embodiment or aspect of the application described as "exemplary" or "such as" is not to be interpreted as preferred or advantageous over other embodiments or aspects. Rather, the use of words such as "exemplary" or "such as" is intended to present related concepts in a concrete fashion.

In the present application, "at least one" means one or more, and "a plurality" means two or more. "and/or", describes an association relationship of an association object, and indicates that there may be three relationships, for example, a and/or B, and may indicate: a alone, a and B together, and B alone, wherein a, B may be singular or plural. The character "/" generally indicates that the context-dependent object is an "or" relationship.

The embodiment of the application can be applied to a wireless communication system, and it should be noted that the wireless communication system mentioned in the embodiment of the application includes but is not limited to: narrowband internet of things (Narrow Band-Internet of Things, NB-IoT), global system for mobile communications (Global System for Mobile Communications, GSM), enhanced data rates for GSM evolution (Enhanced Data rate for GSM Evolution, EDGE), wideband code Division multiple access (Wideband Code Division Multiple Access, WCDMA), code Division multiple access 2000 (Code Division Multiple Access, CDMA 2000), time Division synchronous code Division multiple access (Time Division-Synchronization Code Division Multiple Access, TD-SCDMA), long term evolution (Long Term Evolution, LTE) and 5G mobile communication systems, three-major application scenario enhanced mobile broadband (Enhanced Mobile Broad Band, eMBB), ultra-high reliability and low latency communication (Ultra-reliable and Low Latency Communications, URLLC), and mass Machine communication (massv Machine-Type Communications, mctc).

The communication device mainly comprises network equipment or terminal equipment. In the application, the sending end is network equipment, and the receiving end is terminal equipment; in the application, the sending end is the terminal equipment, and the receiving end is the network equipment.

The terminal equipment of the embodiment of the application comprises: may be a wireless terminal, which may be a device that provides voice and/or other business data connectivity to a user, a handheld device with wireless connectivity, or other processing device connected to a wireless modem. The wireless terminals may communicate with one or more core networks via a radio access network (radio access network, RAN), which may be mobile terminals such as mobile phones (or "cellular" phones) and computers with mobile terminals, e.g., portable, pocket, hand-held, computer-built-in or vehicle-mounted mobile devices that exchange voice and/or data with the radio access network. Such as personal communication services (personal communication service, PCS) phones, cordless phones, session initiation protocol (session initiation protocol, SIP) phones, wireless local loop (wireless local loop, WLL) stations, personal digital assistants (personal digital assistant, PDAs), and the like. A wireless Terminal may also be referred to as a system, subscriber unit (subscriber unit), subscriber station (subscriber station), mobile station (mobile), remote station (remote station), remote Terminal (remote Terminal), access Terminal (access Terminal), user Terminal (user Terminal), user agent (user agent), user device (user device or user equipment), without limitation.

The present application describes various embodiments in connection with a network device. The network device may be a device for communicating with the terminal device, for example, may be a base station (base transceiver station, BTS) in a GSM system or CDMA, may be a base station (nodeB, NB) in a WCDMA system, may be an evolved base station (evolutional nodeB, eNB or eNodeB) in an LTE system, may be a next generation base station (next generation eNodeB, ng-eNB) in an LTE system, or may be a relay station, an Access Point (AP), an in-vehicle device, a wearable device, a network-side device in a 5G network or a network device in a future evolved public land mobile network (public land mobile network, PLMN), etc., for example, may be a new generation base station (generation nodeB, gNB or gndeb).

Fig. 1 is a schematic diagram of a wireless communication system architecture to which the present application is applied, as shown in fig. 1, the wireless communication system of the present application includes a network device and a terminal device, the terminal device sends an SRS to the network device, the network device performs channel estimation according to the SRS to obtain an estimated value of a channel coefficient based on the SRS, the network device may apply the estimated value of the channel coefficient based on the SRS to downlink precoding according to uplink-downlink channel reciprocity, so as to avoid interference between users to implement space division multiplexing, and due to movement of the terminal device or change of a communication environment, a channel outdated problem may occur, so as to reduce loss caused by channel outdated, the network device may perform channel prediction according to the estimated value of the channel coefficient at the current time and the estimated value of the channel coefficient at the historical time, and predict the channel coefficient at the downlink signal transmission time after receiving the SRS of the current subframe. Since the SRS transmitted by the terminal device may be affected by random information unknown to the base station, for example, the random information includes a random phase and a random timing adjustment amount caused by the terminal device automatically adjusting the SRS transmission timing, the estimated value of the channel coefficient may be affected by the random information accordingly, resulting in a decrease in the performance of channel prediction, so that the influence of the random phase and the random timing adjustment amount needs to be reduced to ensure the performance of channel prediction. In order to reduce the influence of the random phase and the random timing adjustment, the timing adjustment compensation and the phase compensation can be performed on the estimated value of the channel coefficient of the SRS of the current subframe after the channel estimation is performed according to the received SRS of the current subframe, and then the channel prediction is performed by using the estimated value of the channel coefficient after the timing adjustment compensation and the phase compensation to obtain the channel coefficient at the downlink signal transmitting moment after the SRS of the current subframe is received.

In the prior art, the method for reducing the influence of the random phase and the random timing adjustment is to perform timing adjustment compensation on the estimated value of the channel coefficient corresponding to the current subframe SRS according to the estimated value of the timing adjustment of the SRS of the current subframe and the SRS of the previous subframe, obtain the estimated value of the channel coefficient after the timing adjustment compensation corresponding to the current subframe SRS, and then perform phase compensation on the estimated value of the channel coefficient after the timing adjustment compensation corresponding to the current subframe SRS according to the estimated value of the phase difference between the SRS of the current subframe and the SRS of the previous subframe, obtain the estimated value of the channel coefficient after the timing adjustment compensation and the phase compensation corresponding to the current subframe SRS, wherein the channel in the real environment is changed along with time and is interfered by noise, the interference factors of the estimated value of the timing adjustment and the estimated value of the phase difference also comprise channel change and noise, and the estimated value of the timing adjustment and the phase difference after the timing adjustment compensation corresponding to the channel change and the noise interference are used for performing timing adjustment compensation and phase compensation, so that the channel prediction performance is poor. In order to solve the problem, fig. 2 is a schematic diagram of a wireless communication system architecture to which the present application is applicable, fig. 3 is a communication process schematic diagram of the channel prediction method provided by the present application, as shown in fig. 2 and 3, by a terminal device measuring a phase difference between an SRS transmitted in a current subframe and an SRS transmitted in a previous subframe after transmitting the SRS each time (i.e., transmitting the SRS in each subframe), a timing adjustment amount of the SRS in the current subframe relative to the SRS in the previous subframe is known to the terminal device, then the terminal device transmits measurement information corresponding to the SRS in the current subframe (including the timing adjustment amount and the phase difference of the SRS in the current subframe relative to the SRS in the previous subframe) to the network device, and after performing channel estimation on the SRS in the current subframe by the network device, channel prediction is performed according to measurement information corresponding to SRS of a historical subframe and an estimated value of a channel coefficient corresponding to SRS of the historical subframe to obtain a predicted value of a channel coefficient corresponding to SRS of a current subframe, wherein the measurement information corresponding to SRS of the historical subframe is measurement information corresponding to SRS of a previous subframe and measurement information corresponding to SRS of subframes before the previous subframe, then the network equipment performs timing adjustment quantity compensation and phase compensation on the estimated value of the channel coefficient corresponding to SRS of the current subframe according to the predicted value of the channel coefficient corresponding to SRS of the current subframe to obtain an estimated value of the channel coefficient corresponding to the first compensation of the SRS of the current subframe, the network equipment can perform channel prediction according to the estimated value of the channel coefficient corresponding to the first compensation of the SRS of the current subframe and the estimated value of the channel coefficient corresponding to the second compensation of each SRS of subframes before the current subframe, and obtaining the channel coefficient of the downlink signal transmission moment after receiving the SRS of the current subframe. After receiving the measurement information corresponding to the SRS of the current subframe, performing timing adjustment quantity compensation and phase compensation on the estimated value of the channel coefficient corresponding to the SRS of the current subframe according to the measurement information corresponding to the SRS of the current subframe and the measurement information corresponding to the SRS of the subframe before the current subframe, to obtain the estimated value of the channel coefficient after the second compensation corresponding to the SRS of the current subframe, and the network device may perform channel prediction according to the estimated value of the channel coefficient after the second compensation corresponding to the SRS of the current subframe and the estimated value of the channel coefficient after the second compensation corresponding to each SRS of the subframes before the current subframe, to obtain the channel coefficient at the downlink signal transmitting time after receiving the measurement information corresponding to the SRS of the current subframe.

Since the phase difference between the SRS of each subframe and the SRS of the previous subframe is measured by the terminal device after each SRS is transmitted, the transmission of the measurement information corresponding to the SRS of each subframe is delayed, and therefore the network device performs timing adjustment amount compensation and phase compensation on the estimated value of the channel coefficient corresponding to the SRS of the current subframe according to the predicted value of the channel coefficient corresponding to the SRS of the current subframe before the measurement information corresponding to the SRS of the current subframe is not received. In the process of obtaining the predicted value of the channel coefficient corresponding to the SRS of the current subframe, since the terminal device knows the timing adjustment amount of the SRS of each subframe relative to the SRS of the previous subframe, the phase difference between the SRS of each subframe and the SRS of the previous subframe is measured by the terminal device, so that the network device can obtain accurate measurement information corresponding to the SRS of each subframe, for the current subframe, the measurement information corresponding to the SRS of the subframe before the current subframe is the measurement information corresponding to the SRS of the historical subframe, the measurement information corresponding to the SRS of the historical subframe is accurate, the network device performs channel prediction according to the accurate measurement information corresponding to the SRS of the historical subframe and the estimated value of the channel coefficient corresponding to the SRS of the previous subframe, and then performs timing adjustment amount compensation and phase compensation on the estimated value of the channel coefficient corresponding to the SRS of the current subframe, which can be guaranteed by using the predicted value of the channel coefficient corresponding to the SRS of the current subframe, which is equivalent to the time-separated measurement information and the phase difference is separated, thereby reducing the accuracy of the measurement and the channel delay can be further guaranteed. The following describes in detail the channel prediction method and apparatus provided by the present application with reference to the accompanying drawings.

Fig. 4 is a flowchart of an embodiment of a channel prediction method provided by the present application, as shown in fig. 4, an execution body of the embodiment may be a network device, and the method of the embodiment may include:

s101, after receiving measurement information corresponding to SRS of a t-1 sub-frame from a terminal device, the network device performs channel prediction according to estimated values of channel coefficients corresponding to SRS of sub-frames before the t sub-frame and the measurement information to obtain predicted values of the channel coefficients corresponding to SRS of the t sub-frame, wherein the measurement information comprises timing adjustment quantity and phase difference, and t is greater than or equal to 2.

The timing adjustment amount is a value obtained by subtracting the transmission timing of the SRS of the t-1 th subframe from the transmission timing of the SRS of the t-2 th subframe, and the phase difference is a value obtained by subtracting the phase of the SRS of the t-2 th subframe from the phase of the SRS of the t-1 th subframe.

Specifically, the SRS is periodically transmitted by the terminal device to the network device, and the transmission period is, for example, N subframes, and it should be noted that, for example, the transmission time of the SRS in the T-th subframe is T, the transmission time of the SRS in the t+1-th subframe is t+n, and the terminal device is configured to transmit, per subframeAfter the SRS is transmitted once (i.e., the SRS is transmitted in each subframe), the phase difference between the SRS transmitted in the current subframe and the SRS transmitted in the previous subframe is measured, the timing adjustment amount of the SRS in the current subframe and the SRS in the previous subframe is known to the terminal device, and then the terminal device transmits measurement information corresponding to the SRS in the current subframe (including the timing adjustment amount and the phase difference of the SRS in the current subframe and the SRS in the previous subframe) to the network device. In this embodiment, the process of processing the SRS of each received subframe by the network device is described by using the t-th subframe as the current subframe, and before receiving the SRS of the t-th subframe, measurement information corresponding to the SRS of the t-1 th subframe transmitted by the terminal device is received. The timing adjustment amount is a value obtained by subtracting the transmission timing of the SRS of the T-1 th subframe from the transmission timing of the SRS of the T-1 th subframe every time the terminal device transmits the SRS, and it is understood that the timing adjustment amount may be a positive number or a negative number, and fig. 5 is a schematic diagram of the timing adjustment amount of the SRS of the T-2 nd subframe with respect to the SRS of the T-1 th subframe, as shown in fig. 5, the upper graph in fig. 5 shows the SRS of the T-2 th subframe, the lower graph in fig. 5 shows the SRS of the T-1 th subframe, and the timing adjustment amount corresponding to the SRS of the T-1 th subframe is a value obtained by subtracting the transmission timing of the SRS of the T-1 th subframe from the transmission timing of the SRS of the T-2 th subframe, that is Δt in fig. 5. Fig. 6 is a schematic diagram of channel coefficients corresponding to SRS, as shown in fig. 6, where S in fig. 6 is SRS of each subframe, The channel coefficient corresponding to the SRS of the t-th subframe,for the SRS corresponding channel coefficient of the t-1 th subframe,Channel coefficient corresponding to SRS of t-2 sub-frame, wherein +.> And->Is random phase (also called random phase sequence), and the phase difference corresponding to SRS of the t-1 sub-frame is equal to the phase of SRS of the t-1 sub-frame +.>Subtracting the phase difference of SRS of the t-2 th subframeIs a value of (2).

Wherein, the estimated value of the channel coefficient corresponding to the SRS of the subframe before the t subframe is: an estimated value of a channel coefficient corresponding to the SRS of the t-1 th subframe, an estimated value of a channel coefficient corresponding to the SRS of the t-2 nd subframe, an estimated value of a channel coefficient corresponding to the SRS of the … … nd subframe, and an estimated value of a channel coefficient corresponding to the SRS of the 1 st subframe; measurement information corresponding to SRS of the subframe before the t subframe is: measurement information corresponding to the SRS of the t-1 th subframe, measurement information corresponding to the SRS of the t-2 nd subframe, measurement information corresponding to the SRS of the … … nd subframe, and measurement information corresponding to the SRS of the 1 st subframe, also referred to as measurement information corresponding to the SRS of the history subframe.

As an implementation manner, the network device performs channel prediction according to the estimated value and the measurement information of the channel coefficient corresponding to the SRS of the subframe before the t-th subframe, which may specifically be:

And S1011, the network equipment performs timing adjustment quantity compensation and phase compensation on the estimated value of the channel coefficient corresponding to the SRS of the t-1 th subframe according to the measurement information corresponding to the SRS of the subframe before the t-1 th subframe, obtains the estimated value of the channel coefficient after the second compensation corresponding to the SRS of the t-1 th subframe, and stores the estimated value of the channel coefficient after the second compensation corresponding to the SRS of the t-1 th subframe.

The estimated value of the channel coefficient after the second compensation corresponding to the SRS of the t-1 sub-frame is the estimated value of the channel coefficient after the second timing adjustment amount compensation and the phase compensation corresponding to the SRS of the t-1 sub-frame, and for the t-1 sub-frame, the estimated value of the channel coefficient after the second timing adjustment amount compensation and the phase compensation is obtained by performing the timing adjustment amount compensation and the phase compensation according to the measurement information corresponding to the SRS of the sub-frame before the t-1 sub-frame, and the estimated value of the channel coefficient after the first timing adjustment amount compensation and the phase compensation is obtained by performing the timing adjustment amount compensation and the phase compensation according to the predicted value of the channel coefficient corresponding to the SRS of the t-1 sub-frame.

Specifically, the network device performs timing adjustment amount compensation on the estimated value of the channel coefficient corresponding to the SRS of the t-1 th subframe according to the historical accumulated timing adjustment amount to obtain the estimated value of the channel coefficient after the timing adjustment amount compensation corresponding to the SRS of the t-1 th subframe, where the historical accumulated timing adjustment amount is the sum of the timing adjustment amounts corresponding to the SRS of subframes before the t-1 th subframe.

And then the network equipment performs phase compensation on the estimated value of the channel coefficient after the timing adjustment compensation corresponding to the SRS of the t-1 sub-frame according to the historical accumulated phase difference to obtain the estimated value of the channel coefficient after the second compensation corresponding to the SRS of the t-1 sub-frame, wherein the historical accumulated phase difference is the sum of the phase differences corresponding to the SRS of the sub-frames before the t sub-frame. After the network device obtains the estimated value of the channel coefficient after the second compensation corresponding to the SRS of the t-1 sub-frame through S1031, the estimated value of the channel coefficient after the second compensation corresponding to the SRS of the t-1 sub-frame is stored.

And S1012, the network equipment carries out channel prediction according to N of the estimated values of the channel coefficients after the second compensation corresponding to the SRS of the subframe before the t subframe, so as to obtain the predicted value of the channel coefficient corresponding to the SRS of the t subframe, wherein N is a preset positive integer, and the estimated value of the channel coefficient after the second compensation corresponding to the SRS of the N subframes comprises the estimated value of the channel coefficient after the second compensation corresponding to the SRS of the t-1 subframe.

It should be noted that, the estimated value of the second compensated channel coefficient corresponding to the SRS of the subframe before the t-1 th subframe is obtained by compensating and storing the estimated value according to the measurement information corresponding to the SRS of the subframe before the t-1 st subframe by the network device, for example, the currently received SRS of the 3 rd subframe, the estimated value of the second compensated channel coefficient corresponding to the SRS of the 2 nd subframe is obtained by the network device through S1011, the estimated value of the second compensated channel coefficient corresponding to the SRS of the 2 nd subframe is stored, and then the channel prediction is performed according to the estimated value of the second compensated channel coefficient corresponding to the SRS of the 2 nd subframe and the estimated value of the second compensated channel coefficient corresponding to the SRS of the 1 st subframe, so as to obtain the predicted value of the channel coefficient corresponding to the SRS of the 3 rd subframe, where the estimated value of the channel coefficient corresponding to the second compensated SRS of the 1 st subframe is already stored by the network device.

Specifically, for each subframe before the t-th subframe, that is, the t-1 th subframe, the t-2 nd subframe, the … … nd subframe, and the 1 st subframe, the network device obtains the estimated value of the second compensated channel coefficient corresponding to the SRS of each subframe according to S1011, stores the estimated value of the second compensated channel coefficient corresponding to the SRS of each subframe, obtains the estimated value of the second compensated channel coefficient corresponding to the SRS of the t-1 st subframe, and performs channel prediction according to N of the stored estimated values of the second compensated channel coefficient corresponding to the SRS of the subframe before the t-th subframe, where the estimated value of the second compensated channel coefficient corresponding to the SRS of the N subframes includes the estimated value of the second compensated channel coefficient corresponding to the SRS of the t-1 th subframe, and the channel prediction may be performed by using a channel prediction algorithm. Wherein N is a preset positive integer, for example, N is 20, and optionally, the estimated values of the channel coefficients after the second compensation corresponding to the SRS of the N subframes are N subframes nearest to the t subframe, namely, the t-1 subframe, the t-2 subframe, the … … t-19 subframe and the t-20 subframe. By setting the estimated values of the channel coefficients after the second compensation corresponding to the SRS of the N subframes to the N number nearest to the t subframe, on one hand, the complexity of channel prediction in S1012 can be reduced, and on the other hand, the performance of channel prediction can be ensured. It is to be understood that N may be all estimated values of the channel coefficients after the second compensation corresponding to the SRS of the subframe before the t-th subframe.

Further, the network device may store only the estimated value of the channel coefficient after the second compensation corresponding to the SRS of the N subframes nearest to the t-th subframe, and the storage is not required before the t-N subframes, so that the required storage capacity may be reduced.

S102, the network equipment carries out channel estimation according to the SRS of the t subframe received from the terminal equipment, and an estimated value of a channel coefficient corresponding to the SRS of the t subframe is obtained.

Specifically, after receiving the SRS of the t subframe, the network device performs channel estimation on the SRS of the t subframe to obtain an estimated value of a channel coefficient corresponding to the SRS of the t subframe.

And S103, the network equipment performs timing adjustment quantity compensation and phase compensation on the estimated value of the channel coefficient corresponding to the SRS of the t subframe according to the predicted value of the channel coefficient corresponding to the SRS of the t subframe, so as to obtain the estimated value of the channel coefficient corresponding to the SRS of the t subframe after the first compensation.

The estimated value of the channel coefficient after the first compensation corresponding to the SRS of the t-th subframe is the estimated value of the channel coefficient after the first timing adjustment amount compensation and the phase compensation corresponding to the SRS of the t-th subframe.

Specifically, since the phase difference between the SRS of each subframe and the SRS of the previous subframe is that the terminal device measures and transmits after transmitting each SRS, and is delayed, the network device performs timing adjustment amount compensation and phase compensation on the estimated value of the channel coefficient corresponding to the SRS of the current subframe according to the predicted value of the channel coefficient corresponding to the SRS of the current subframe before not receiving the measurement information corresponding to the SRS of the current subframe, as an implementation manner, S103 may include:

S1031, the network equipment determines estimated values of timing adjustment amounts of the t sub-frame and the t-1 sub-frame according to the predicted value of the channel coefficient corresponding to the SRS of the t sub-frame and the estimated value of the channel coefficient corresponding to the SRS of the t sub-frame.

S1032, the network device performs timing adjustment compensation on the estimated value of the channel coefficient corresponding to the SRS of the t subframe according to the estimated values of the timing adjustment of the t subframe and the t-1 subframe, and obtains the estimated value of the channel coefficient after the timing adjustment compensation corresponding to the SRS of the t subframe.

S1033, the network equipment determines an estimated value of the phase difference between the t sub-frame and the t-1 sub-frame according to the predicted value of the channel coefficient corresponding to the SRS of the t sub-frame and the estimated value of the channel coefficient compensated by the timing adjustment quantity corresponding to the SRS of the t sub-frame.

S1034, the network equipment performs phase compensation on the estimated value of the channel coefficient after the timing adjustment compensation corresponding to the SRS of the t subframe according to the estimated value of the phase difference between the t subframe and the t-1 subframe, so as to obtain the estimated value of the channel coefficient after the first compensation corresponding to the SRS of the t subframe.

And S104, the network equipment performs channel prediction according to the estimated value of the channel coefficient after the first compensation corresponding to the SRS of the t subframe and the estimated value of the channel coefficient after the second compensation corresponding to each SRS of the subframes before the t subframe, and obtains the channel coefficient at the downlink signal transmitting moment after the SRS of the t subframe is received.

Specifically, the network device may perform channel prediction according to N preset in the estimated value of the first compensated channel coefficient corresponding to the SRS of the t-th subframe and the estimated value of the second compensated channel coefficient corresponding to each SRS of the subframes before the t-th subframe, where the estimated value of the second compensated channel coefficient corresponding to the SRS of the N subframes is N nearest to the t-th subframe.

According to the channel prediction method provided by the embodiment, after the network equipment receives the measurement information corresponding to the SRS of the t-1 subframe from the terminal equipment, channel prediction is performed according to the estimated value of the channel coefficient corresponding to the SRS of the subframe before the t subframe and the measurement information, so as to obtain the estimated value of the channel coefficient corresponding to the SRS of the t subframe, the measurement information comprises a timing adjustment amount and a phase difference, then channel estimation is performed according to the SRS of the t subframe received from the terminal equipment, so as to obtain the estimated value of the channel coefficient corresponding to the SRS of the t subframe, because the transmission of the measurement information corresponding to the SRS of each subframe is delayed, the network equipment performs timing adjustment amount compensation and phase compensation according to the estimated value of the channel coefficient corresponding to the SRS of the t subframe before the SRS of the t subframe is not received, so as to obtain the estimated value of the channel coefficient corresponding to the SRS of the first time after the SRS of the t subframe is compensated, and the estimated value of the first time after the SRS of the first time after the first time of the corresponding to the subframe is received, and the estimated value of the channel coefficient corresponding to the SRS of the first time after the SRS of the first time of the subframe is received. In the process of acquiring the predicted value of the channel coefficient corresponding to the SRS of the t-th subframe, since the terminal device knows the timing adjustment amount of the SRS of each subframe relative to the SRS of the previous subframe, the phase difference between the SRS of each subframe and the SRS of the previous subframe is measured by the terminal device, so that the network device can obtain accurate measurement information corresponding to the SRS of each subframe, for the t-th subframe, the measurement information corresponding to the SRS of the subframe before the t-th subframe is the measurement information corresponding to the SRS of the history subframe, the measurement information corresponding to the SRS of the history subframe is accurate, the network device performs channel prediction according to the accurate measurement information corresponding to the SRS of the history subframe and the estimated value of the channel coefficient corresponding to the SRS of the history subframe, and then obtains the predicted value of the channel coefficient corresponding to the SRS of the current subframe, and compensates the timing adjustment amount and phase compensation of the estimated value of the channel coefficient corresponding to the SRS of the current subframe, which is equivalent to the time offset of the timing adjustment amount and the phase difference of the estimated value of the channel coefficient corresponding to the SRS of the current subframe, thereby reducing the channel delay performance and reducing the influence of the time offset and the time offset of the predicted value.

Fig. 7 is a flowchart of an embodiment of a channel prediction method provided by the present application, where an execution body of the embodiment may be a network device, and the method of the embodiment may further include, based on the embodiment shown in fig. 4:

s105, the network equipment receives measurement information corresponding to SRS of the t subframe.

And S106, the network equipment performs timing adjustment quantity compensation and phase compensation on the estimated value of the channel coefficient corresponding to the SRS of the t subframe according to the measurement information corresponding to the SRS of the t subframe and the measurement information corresponding to the SRS of the subframe before the t subframe, and obtains the estimated value of the channel coefficient corresponding to the SRS of the t subframe after the second compensation.

And S107, the network equipment continues to conduct channel prediction according to the estimated value of the channel coefficient after the second compensation corresponding to the SRS of the t subframe and the estimated value of the channel coefficient after the second compensation corresponding to each SRS of the subframes before the t subframe, and obtains the channel coefficient at the downlink signal transmitting moment after receiving the measurement information corresponding to the SRS of the t subframe.

After receiving the measurement information corresponding to the SRS of the t subframe, the network device directly performs timing adjustment quantity compensation and phase compensation on the estimated value of the channel coefficient corresponding to the SRS of the t subframe according to the measurement information corresponding to the SRS of the t subframe and the measurement information corresponding to the SRS of the subframe before the t subframe. Since the measurement information corresponding to the SRS of each subframe is transmitted after the SRS and is delayed, the network device performs timing adjustment compensation and phase compensation on the estimated value of the channel coefficient corresponding to the SRS of the t subframe according to the predicted value of the channel coefficient corresponding to the SRS of the t subframe before the measurement information corresponding to the SRS of the t subframe is not received, so that the accuracy of the timing adjustment compensation and phase compensation can be improved, and the network device directly performs timing adjustment compensation and phase compensation on the estimated value of the channel coefficient corresponding to the SRS of the t subframe according to the measurement information corresponding to the SRS of the t subframe and the measurement information corresponding to the SRS of the subframe before the t subframe after the measurement information corresponding to the SRS of the t subframe is received. Therefore, the influence caused by the delay of the measurement information can be reduced, and the performance of channel prediction is further ensured.

Fig. 8 is a flowchart of an embodiment of a channel prediction method provided by the present application, where an execution body of the embodiment may be a network device, and the method of the embodiment is based on the embodiment shown in fig. 8, and in this embodiment, referring to fig. 8, a practical implementation manner of S103 and S104 is described in detail, and as shown in fig. 8, the method of the embodiment may include:

S201-S202 are the same as S101 and S102, and reference is made to S101-S102 for details, which are not repeated here.

S203, the network device calculates a historical accumulated timing adjustment according to the timing adjustment Δτ (n) corresponding to the SRS of the subframe before the t-th subframe, n=1, 2, …, t-1

S204, the network equipment accumulates timing adjustment according to the historyPerforming timing adjustment quantity compensation on the estimated value of the channel coefficient corresponding to the SRS of the t-1 subframe to obtain the estimated value of the channel coefficient subjected to timing adjustment quantity compensation corresponding to the SRS of the t-1 subframe ≡>Specifically, the +.>

K is the total subcarrier number of SRS, wherein H _k (t-1) is an estimated value of a channel coefficient corresponding to the SRS of the t-1 th subframe.

According to the following in S204The timing adjustment amount compensation is performed on the estimated value of the channel coefficient corresponding to the SRS of the t-1 th subframe, so that the transmission timing of the SRS of the t-1 th subframe is the same as the transmission timing of the SRS of the 0 th subframe, and it is understood that the timing adjustment amount of the SRS of the subframe before the t-1 th subframe is compensated.

S205, the network equipment performs phase difference according to the SRS corresponding to the subframe before the t subframeCalculating the cumulative phase difference +.>

S206, the network equipment is according toEstimated value of channel coefficient after compensation of timing adjustment amount corresponding to SRS of t-1 sub-frame +.>Performing phase compensation to obtain estimated value ++of channel coefficient after second compensation corresponding to SRS of t-1 sub-frame>Specifically, the +.>

According to S206Estimated value of channel coefficient after compensation of timing adjustment amount corresponding to SRS of t-1 sub-frame +.>By performing the phase compensation, the phase of the SRS of the t-1 th subframe and the phase of the SRS of the 0 th subframe are identical, and it is understood that the phases of the SRS of the subframes before the t-1 th subframe are all compensated.

S207, the network equipment compensates the estimated value of the channel coefficient after the second time corresponding to the SRS of the subframe before the t subframeChannel prediction is performed on n=1, 2, …, t-1, k=0, 1, …, K-1, and a predicted value of a channel coefficient corresponding to SRS of the t-th subframe is obtained>Wherein N is a preset positive integer. />

S208, the network equipment determines the estimated value of the timing adjustment quantity of the t sub-frame and the t-1 sub-frame according to the predicted value of the channel coefficient corresponding to the SRS of the t sub-frame and the estimated value of the channel coefficient corresponding to the SRS of the t sub-frame

As an implementation manner, S208 may be: the network equipment predicts the value of the channel coefficient corresponding to the SRS of the t subframeEstimation value H of channel coefficient corresponding to SRS of t sub-frame _k (t) is determined by the following formula

Wherein ( ^* Representing the complex conjugate.

It should be noted that the number of the substrates,but may be obtained by other calculation, and the present embodiment is not limited thereto.

S209, the network equipment estimates the timing adjustment quantity according to the t-th subframe and the t-1-th subframeEstimation value H of channel coefficient corresponding to SRS of t subframe _k (t) compensating the timing adjustment amount to obtain an estimated value of the channel coefficient after the timing adjustment amount compensation corresponding to the SRS of the t sub-frame>Specifically, the +.>

S210, the network equipment determines an estimated value of the phase difference between the t sub-frame and the t-1 sub-frame according to the predicted value of the channel coefficient corresponding to the SRS of the t sub-frame and the estimated value of the channel coefficient compensated by the timing adjustment quantity corresponding to the SRS of the t sub-frame

As an implementation manner, S209 may be: the network equipment predicts the value of the channel coefficient corresponding to the SRS of the t subframeAnd->The +.>

Where angle (·) represents the phase of the complex number.

It should be noted that the number of the substrates, But may be obtained by other calculation, and the present embodiment is not limited thereto.

S211, the network equipment estimates the value according to the phase difference between the t subframe and the t-1 subframeFor->Performing phase compensation to obtain an estimated value +_of the channel coefficient after the first compensation corresponding to SRS of the t-th subframe>Specifically, the +.>

S212, the network equipment estimates the channel coefficient after the first compensation according to the SRS of the t subframeAnd carrying out channel prediction on the estimated value of the channel coefficient after the second compensation corresponding to each SRS of the subframe before the t subframe to obtain the channel coefficient at the downlink signal transmission moment after the SRS of the t subframe is received.

Specifically, the SRS correspondence of the t-th subframe is obtained through S211Estimate of channel coefficient after first compensation of (c)After that, can be according to->The channel prediction may be performed by performing a channel prediction algorithm on the estimated value of the channel coefficient after the second compensation corresponding to each SRS of the subframe before the t-th subframe.

According to the channel prediction method provided by the embodiment, since the transmission of the measurement information corresponding to the SRS of each subframe is delayed, before the network device does not receive the measurement information corresponding to the SRS of the t subframe, the network device performs timing adjustment compensation and phase compensation on the estimated value of the channel coefficient corresponding to the SRS of the t subframe according to the predicted value of the channel coefficient corresponding to the SRS of the t subframe, so as to obtain the estimated value of the channel coefficient corresponding to the SRS of the t subframe after the first compensation, and perform timing adjustment compensation and phase compensation on the estimated value of the channel coefficient corresponding to the SRS of the t subframe, and then performs channel prediction according to the estimated value of the channel coefficient corresponding to the first compensation of the SRS of the t subframe and the estimated value of the channel coefficient corresponding to the second compensation of each SRS of the subframes before the t subframe, so as to obtain the channel coefficient at the downlink signal transmission time after the SRS of the t subframe is received. In the process of acquiring the predicted value of the channel coefficient corresponding to the SRS of the t-th subframe, since the terminal device knows the timing adjustment amount of the SRS of each subframe relative to the SRS of the previous subframe, the phase difference between the SRS of each subframe and the SRS of the previous subframe is measured by the terminal device, so that the network device can obtain accurate measurement information corresponding to the SRS of each subframe, for the t-th subframe, the measurement information corresponding to the SRS of the subframe before the t-th subframe is the measurement information corresponding to the SRS of the history subframe, the measurement information corresponding to the SRS of the history subframe is accurate, the network device performs channel prediction according to the accurate measurement information corresponding to the SRS of the history subframe and the estimated value of the channel coefficient corresponding to the SRS of the history subframe, and then obtains the predicted value of the channel coefficient corresponding to the SRS of the current subframe, and compensates the timing adjustment amount and phase compensation of the estimated value of the channel coefficient corresponding to the SRS of the current subframe, which is equivalent to the time offset of the timing adjustment amount and the phase difference of the estimated value of the channel coefficient corresponding to the SRS of the current subframe, thereby reducing the channel delay performance and reducing the influence of the time offset and the time offset of the predicted value.

The technical solution of the method embodiment shown in fig. 4, 7 and 8 will be described in detail below by using a specific embodiment.

Fig. 9 is an interactive flowchart of an embodiment of a channel prediction method provided by the present application, where, as shown in fig. 9, the method in this embodiment may include:

s301, the terminal equipment sends SRS of the t-1 th subframe to the network equipment.

S302, the terminal equipment measures the phase difference between the SRS of the t-1 subframe and the SRS of the t-2 subframe.

Specifically, the phase difference between the SRS of the t-1 th subframe and the SRS of the t-2 th subframe is a value obtained by subtracting the phase of the SRS of the t-2 th subframe from the phase of the SRS of the t-1 th subframe.

S303, the terminal equipment sends measurement information corresponding to SRS of the t-1 subframe to the network equipment, wherein the measurement information comprises timing adjustment quantity and phase difference.

And S304, the network equipment performs channel prediction according to the estimated value and the measurement information of the channel coefficient corresponding to the SRS of the subframe before the t subframe, and obtains the predicted value of the channel coefficient corresponding to the SRS of the t subframe.

The specific manner may be S203 to S207 shown in fig. 7, which will not be described herein.

S305, the terminal equipment sends SRS of the t subframe to the network equipment.

S306, the network equipment carries out channel estimation on the SRS of the t subframe to obtain an estimated value of a channel coefficient corresponding to the SRS of the t subframe.

S307, the network equipment performs timing adjustment quantity compensation and phase compensation on the estimated value of the channel coefficient corresponding to the SRS of the t subframe according to the predicted value of the channel coefficient corresponding to the SRS of the t subframe, and obtains the estimated value of the channel coefficient corresponding to the SRS of the t subframe after the first compensation.

The specific manner may be S208 to S211 shown in fig. 8, which will not be described here.

And S308, the network equipment performs channel prediction according to the estimated value of the channel coefficient after the first compensation corresponding to the SRS of the t subframe and the estimated value of the channel coefficient after the second compensation corresponding to each SRS of the subframes before the t subframe, so as to obtain the channel coefficient at the time of transmitting the downlink signal after the SRS of the t subframe is received.

S309, the terminal equipment sends measurement information corresponding to the SRS of the t subframe to the network equipment.

And S310, after receiving the measurement information corresponding to the SRS of the t subframe, the network equipment performs timing adjustment quantity compensation and phase compensation on the estimated value of the channel coefficient corresponding to the SRS of the t subframe according to the measurement information corresponding to the SRS of the t subframe and the measurement information corresponding to the SRS of the subframe before the t subframe, so as to obtain the estimated value of the channel coefficient corresponding to the SRS of the t subframe after the second compensation.

As an implementation manner, S310 may specifically be:

s3101, the network device calculates a history accumulated timing adjustment amount according to the timing adjustment amount corresponding to the SRS of the t-th subframe and the timing adjustment amount Δτ (n) corresponding to the SRS of the subframe preceding the t-th subframe, n=1, 2, …, t

S3102, the network equipment accumulates timing adjustment according to the historyPerforming timing adjustment quantity compensation on the estimated value of the channel coefficient corresponding to the SRS of the t subframe to obtain the SRS corresponding to the t subframeEstimate of channel coefficient after timing adjustment amount compensation +.>Specifically, the +.>

K is the total subcarrier number of SRS, wherein H _k And (t) is an estimated value of a channel coefficient corresponding to the SRS of the t-th subframe.

According to S3102The timing adjustment amount compensation is performed on the estimated value of the channel coefficient corresponding to the SRS of the t-th subframe, so that the transmission timing of the SRS of the t-th subframe is the same as the transmission timing of the SRS of the 0-th subframe, and it is understood that the timing adjustment amounts of the SRS of the subframes before the t-th subframe are compensated, and the SRS of the 1-th subframe has the timing adjustment amount and the phase difference with respect to the SRS of the 0-th subframe, so that the transmission timing of the SRS of each subframe is the same as the transmission timing of the SRS of the 0-th subframe after the compensation.

S3103, the network equipment performs a phase difference according to the phase difference corresponding to the SRS of the t subframe and the phase difference corresponding to the SRS of the subframe before the t subframeCalculating the cumulative phase difference +.>

S3102, network device is according toEstimated value of channel coefficient compensated by timing adjustment amount corresponding to SRS of t sub-frame +.>Performing phase compensation to obtain estimated value +_of channel coefficient after second compensation corresponding to SRS of t sub-frame>Specifically, the +.>

According to S3102Estimated value of channel coefficient compensated by timing adjustment amount corresponding to SRS of t sub-frame +.>By performing the phase compensation, the SRS phase of the t-th subframe and the SRS phase of the 0 th subframe may be the same, and it is understood that the SRS phases of the subframes before the t-th subframe are all compensated.

And S311, the network equipment continues to conduct channel prediction according to the estimated value of the channel coefficient after the second compensation corresponding to the SRS of the t subframe and the estimated value of the channel coefficient after the second compensation corresponding to each SRS of the subframes before the t subframe, and obtains the channel coefficient at the downlink signal transmitting moment after receiving the measurement information corresponding to the SRS of the t subframe.

Fig. 10 is a schematic structural diagram of an embodiment of a network device according to the present application, as shown in fig. 10, where the network device in this embodiment may include: a receiving module 11, a channel predicting module 12, a channel estimating module 13 and a processing module 14, wherein,

The receiving module 11 is configured to receive measurement information corresponding to a sounding reference signal SRS of a t-1 th subframe from a terminal device, where the measurement information includes a timing adjustment amount and a phase difference, and t is greater than or equal to 2;

the channel prediction module 12 is configured to perform channel prediction according to the estimated value and the measurement information of the channel coefficient corresponding to each SRS of the subframe before the t subframe, so as to obtain a predicted value of the channel coefficient corresponding to the SRS of the t subframe;

the receiving module 11 is further configured to: receiving an SRS of a t subframe from a terminal device;

the channel estimation module 12 is configured to perform channel estimation according to the SRS of the t subframe, and obtain an estimated value of a channel coefficient corresponding to the SRS of the t subframe;

the processing module 14 is configured to perform timing adjustment compensation and phase compensation on the estimated value of the channel coefficient corresponding to the SRS of the t subframe according to the predicted value of the channel coefficient corresponding to the SRS of the t subframe, so as to obtain the estimated value of the channel coefficient corresponding to the SRS of the t subframe after the first compensation;

the channel prediction module 12 is further configured to: and carrying out channel prediction according to the estimated value of the channel coefficient after the first compensation corresponding to the SRS of the t subframe and the estimated value of the channel coefficient after the second compensation corresponding to each SRS of the subframes before the t subframe, and obtaining the channel coefficient at the downlink signal transmitting moment after the SRS of the t subframe is received.

Further, the receiving module 11 is further configured to:

receiving measurement information corresponding to SRS of a t subframe;

the processing module 14 is also configured to: according to the measurement information corresponding to the SRS of the t subframe and the measurement information corresponding to the SRS of the subframe before the t subframe, performing timing adjustment quantity compensation and phase compensation on the estimated value of the channel coefficient corresponding to the SRS of the t subframe to obtain the estimated value of the channel coefficient after the second compensation corresponding to the SRS of the t subframe;

the channel prediction module 12 is further configured to: and continuously carrying out channel prediction according to the estimated value of the channel coefficient after the second compensation corresponding to the SRS of the t subframe and the estimated value of the channel coefficient after the second compensation corresponding to each SRS of the subframes before the t subframe, and obtaining the channel coefficient at the downlink signal transmitting moment after receiving the measurement information corresponding to the SRS of the t subframe.

The apparatus of this embodiment may be used to implement the technical solution of the method embodiment shown in fig. 4, and its implementation principle and technical effects are similar, and are not described here again.

Fig. 11 is a schematic structural diagram of an embodiment of a network device according to the present application, as shown in fig. 11, where, on the basis of the embodiment shown in fig. 10, the channel prediction module 12 may include: a compensation unit 121 and a channel prediction unit 122, wherein,

The compensation unit 121 is configured to perform timing adjustment compensation and phase compensation on the estimated value of the channel coefficient corresponding to the SRS of the t-1 th subframe according to the measurement information corresponding to the SRS of the subframe before the t-1 th subframe, obtain the estimated value of the channel coefficient corresponding to the SRS of the t-1 th subframe after the second compensation, and store the estimated value of the channel coefficient corresponding to the SRS of the t-1 th subframe after the second compensation.

The channel prediction unit 122 is configured to perform channel prediction according to N of the second compensated channel coefficient estimation values corresponding to the SRS of the subframe before the t subframe, so as to obtain a predicted value of the channel coefficient corresponding to the SRS of the t subframe, where N is a preset positive integer, and the second compensated channel coefficient estimation values corresponding to the SRS of the N subframes include the second compensated channel coefficient estimation value corresponding to the SRS of the t-1 subframe.

Further, the compensation unit 121 specifically is configured to: and performing timing adjustment amount compensation on the estimated value of the channel coefficient corresponding to the SRS of the t-1 th subframe according to the historical accumulated timing adjustment amount to obtain the estimated value of the channel coefficient after the timing adjustment amount compensation corresponding to the SRS of the t-1 th subframe, wherein the historical accumulated timing adjustment amount is the sum of the timing adjustment amounts corresponding to the SRS of the subframes before the t-1 th subframe, and performing phase compensation on the estimated value of the channel coefficient after the timing adjustment amount compensation corresponding to the SRS of the t-1 th subframe according to the historical accumulated phase difference to obtain the estimated value of the channel coefficient after the second compensation corresponding to the SRS of the t-1 th subframe, and the historical accumulated phase difference is the sum of the phase differences corresponding to the SRS of the subframes before the t-th subframe.

Fig. 12 is a schematic structural diagram of an embodiment of a network device according to the present application, as shown in fig. 11, where, based on the embodiment shown in fig. 10 or fig. 11, the processing module 14 may include: a first determination unit 141, a first compensation unit 142, a second determination unit 143, and a second compensation unit 144, wherein,

the first determining unit 141 is configured to determine an estimated value of a timing adjustment amount of the t-th subframe and the t-1 th subframe according to the predicted value of the channel coefficient corresponding to the SRS of the t-th subframe and the estimated value of the channel coefficient corresponding to the SRS of the t-th subframe;

the first compensation unit 142 is configured to perform timing adjustment compensation on the estimated value of the channel coefficient corresponding to the SRS of the t subframe according to the estimated values of the timing adjustment amounts of the t subframe and the t-1 subframe, so as to obtain the estimated value of the channel coefficient after the timing adjustment amount compensation corresponding to the SRS of the t subframe:

the second determining unit 143 determines an estimated value of the phase difference between the t-th subframe and the t-1 th subframe according to the predicted value of the channel coefficient corresponding to the SRS of the t-th subframe and the estimated value of the channel coefficient compensated by the timing adjustment amount corresponding to the SRS of the t-th subframe;

The second compensation unit 144 is configured to perform phase compensation on the estimated value of the channel coefficient compensated by the timing adjustment corresponding to the SRS of the t sub-frame according to the estimated value of the phase difference between the t sub-frame and the t-1 sub-frame, so as to obtain the estimated value of the channel coefficient compensated for the first time corresponding to the SRS of the t sub-frame.

Further, the compensation unit 121 specifically is configured to:

K is the total subcarrier number of SRS;

Further, the compensation unit 121 specifically is configured to:

According toEstimated value +.of channel coefficient after compensating timing adjustment amount corresponding to SRS of t-1 sub-frame by the following formula>Performing phase compensation to obtain estimated value ++of channel coefficient after second compensation corresponding to SRS of t-1 sub-frame >

Further, the channel prediction unit 122 specifically is configured to:

estimating value of channel coefficient after second compensation according to SRS of subframe before t-th subframeChannel prediction is performed on n=1, 2, …, t-1, k=0, 1, …, K-1, and a predicted value of a channel coefficient corresponding to SRS of the t-th subframe is obtained>

Further, the first compensation unit 142 is specifically configured to:

The second compensation unit 144 is specifically configured to:

Further, the first determining unit 141 is specifically configured to:

Wherein ( ^* Representing the complex conjugate.

Further, the second determining unit 143 is specifically configured to:

Where angle (·) represents the phase of the complex number.

The device of this embodiment may be used to implement the technical solution of the method embodiment shown in fig. 7, and its implementation principle and technical effects are similar, and are not described here again.

Fig. 13 is a schematic structural diagram of a network device according to the present application, where the network device 100 includes:

a memory 101 and a processor 102;

a memory 101 for storing a computer program;

a processor 102 for executing a computer program stored in a memory to implement the channel prediction method in the above embodiment. Reference may be made in particular to the relevant description of the embodiments of the method described above.

Alternatively, the memory 101 may be separate or integrated with the processor 102.

When memory 101 is a device separate from processor 102, wireless access network device 100 may further comprise:

a bus 103 for connecting the memory 101 to the processor 102.

Optionally, the present embodiment further includes: a communication interface 104, the communication interface 104 being connectable with the processor 102 via the bus 103. Processor 102 may control communication interface 103 to implement the above-described functions of receiving and transmitting of network device 100.

The device may be configured to perform the steps and/or flows corresponding to the network device in the foregoing method embodiment.

The present application also provides a readable storage medium having stored therein execution instructions that, when executed by at least one processor of a channel prediction apparatus, perform the channel prediction methods provided by the various embodiments described above.

The present application also provides a program product comprising execution instructions stored in a readable storage medium. The at least one processor of the channel prediction apparatus may read the execution instructions from the readable storage medium, and execution of the execution instructions by the at least one processor causes the channel prediction apparatus to implement the channel prediction methods provided by the various embodiments described above.

Those of ordinary skill in the art will appreciate that: in the above embodiments, it may be implemented in whole or in part by software, hardware, firmware, or any combination thereof. When implemented in software, may be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on a computer, the processes or functions in accordance with embodiments of the present application are produced in whole or in part. The computer may be a general purpose computer, a special purpose computer, a computer network, or other programmable apparatus. The computer instructions may be stored in or transmitted from one computer-readable storage medium to another, for example, by wired (e.g., coaxial cable, fiber optic, digital Subscriber Line (DSL)), or wireless (e.g., infrared, wireless, microwave, etc.) means from one website, computer, server, or data center. Computer readable storage media can be any available media that can be accessed by a computer or data storage devices, such as servers, data centers, etc., that contain an integration of one or more available media. The usable medium may be a magnetic medium (e.g., floppy Disk, hard Disk, magnetic tape), an optical medium (e.g., DVD), or a semiconductor medium (e.g., solid State Disk (SSD)), etc.

Claims

1. A method of channel prediction, comprising:

after receiving measurement information corresponding to Sounding Reference Signals (SRS) of a t-1 th subframe from terminal equipment, network equipment performs channel prediction according to estimated values of channel coefficients corresponding to SRS of subframes before the t-1 th subframe and the measurement information to obtain predicted values of the channel coefficients corresponding to SRS of the t-th subframe, wherein the measurement information comprises timing adjustment quantity and phase difference, and t is greater than or equal to 2;

the network equipment carries out channel estimation according to the SRS of the t subframe received from the terminal equipment, and obtains an estimated value of a channel coefficient corresponding to the SRS of the t subframe;

the network equipment performs timing adjustment quantity compensation and phase compensation on the estimated value of the channel coefficient corresponding to the SRS of the t subframe according to the predicted value of the channel coefficient corresponding to the SRS of the t subframe, and obtains the estimated value of the channel coefficient corresponding to the SRS of the t subframe after the first compensation;

and the network equipment performs channel prediction according to the estimated value of the channel coefficient after the first compensation corresponding to the SRS of the t subframe and the estimated value of the channel coefficient after the second compensation corresponding to each SRS of the subframes before the t subframe, so as to obtain the channel coefficient at the time of transmitting the downlink signal after the SRS of the t subframe is received.

2. The method according to claim 1, wherein the method further comprises:

the network equipment receives measurement information corresponding to SRS of the t subframe;

the network equipment performs timing adjustment quantity compensation and phase compensation on the estimated value of the channel coefficient corresponding to the SRS of the t subframe according to the measurement information corresponding to the SRS of the t subframe and the measurement information corresponding to the SRS of the subframe before the t subframe, and obtains the estimated value of the channel coefficient corresponding to the SRS of the t subframe after the second compensation;

and the network equipment continues to conduct channel prediction according to the estimated value of the channel coefficient after the second compensation corresponding to the SRS of the t subframe and the estimated value of the channel coefficient after the second compensation corresponding to each SRS of the subframes before the t subframe, so as to obtain the channel coefficient at the downlink signal sending moment after receiving the measurement information corresponding to the SRS of the t subframe.

3. The method according to claim 1 or 2, wherein the network device performs channel prediction according to the estimated value and the measurement information of the channel coefficient corresponding to each SRS of the subframe before the t subframe, to obtain the predicted value of the channel coefficient corresponding to the SRS of the t subframe, including:

The network equipment performs timing adjustment quantity compensation and phase compensation on the estimated value of the channel coefficient corresponding to the SRS of the t-1 th subframe according to the measurement information corresponding to the SRS of the subframe before the t-1 th subframe, obtains the estimated value of the channel coefficient corresponding to the SRS of the t-1 th subframe after the second compensation, and stores the estimated value of the channel coefficient corresponding to the SRS of the t-1 th subframe after the second compensation;

and the network equipment carries out channel prediction according to N of the estimated values of the channel coefficients after the second compensation corresponding to the SRS of the subframe before the t subframe to obtain the predicted value of the channel coefficient corresponding to the SRS of the t subframe, wherein N is a preset positive integer, and the estimated values of the channel coefficients after the second compensation corresponding to the SRS of the N subframes comprise the estimated values of the channel coefficients after the second compensation corresponding to the SRS of the t-1 subframe.

4. The method of claim 3, wherein the network device performs timing adjustment compensation and phase compensation on the estimated value of the channel coefficient corresponding to the SRS of the t-1 th subframe according to the measurement information corresponding to the SRS of the subframe before the t-1 th subframe, to obtain the estimated value of the channel coefficient corresponding to the SRS of the t-1 th subframe after the second compensation, including:

The network equipment performs timing adjustment amount compensation on the estimated value of the channel coefficient corresponding to the SRS of the t-1 sub-frame according to the historical accumulated timing adjustment amount to obtain the estimated value of the channel coefficient after the timing adjustment amount compensation corresponding to the SRS of the t-1 sub-frame, wherein the historical accumulated timing adjustment amount is the sum of the timing adjustment amounts corresponding to the SRS of the sub-frames before the t-1 sub-frame;

and the network equipment performs phase compensation on the estimated value of the channel coefficient after the timing adjustment compensation corresponding to the SRS of the t-1 sub-frame according to the historical accumulated phase difference to obtain the estimated value of the channel coefficient after the second compensation corresponding to the SRS of the t-1 sub-frame, wherein the historical accumulated phase difference is the sum of the phase differences corresponding to the SRS of the sub-frame before the t sub-frame.

5. The method according to any one of claims 1-4, wherein the performing, by the network device, timing adjustment compensation and phase compensation on the estimated value of the channel coefficient corresponding to the SRS of the t-th subframe according to the predicted value of the channel coefficient corresponding to the SRS of the t-th subframe, to obtain the estimated value of the channel coefficient corresponding to the SRS of the t-th subframe after the first compensation includes:

The network equipment determines estimated values of timing adjustment amounts of the t sub-frame and the t-1 sub-frame according to the predicted values of the channel coefficients corresponding to the SRS of the t sub-frame and the estimated values of the channel coefficients corresponding to the SRS of the t sub-frame;

the network device performs timing adjustment compensation on the estimated value of the channel coefficient corresponding to the SRS of the t subframe according to the estimated values of the timing adjustment of the t subframe and the t-1 subframe, and obtains the estimated value of the channel coefficient after the timing adjustment compensation corresponding to the SRS of the t subframe:

the network equipment determines an estimated value of the phase difference between the t sub-frame and the t-1 sub-frame according to the predicted value of the channel coefficient corresponding to the SRS of the t sub-frame and the estimated value of the channel coefficient compensated by the timing adjustment quantity corresponding to the SRS of the t sub-frame;

and the network equipment performs phase compensation on the estimated value of the channel coefficient after the timing adjustment compensation corresponding to the SRS of the t subframe according to the estimated value of the phase difference between the t subframe and the t-1 subframe, so as to obtain the estimated value of the channel coefficient after the first compensation corresponding to the SRS of the t subframe.

6. The method of claim 4, wherein the network device performing timing adjustment compensation on the estimated value of the channel coefficient corresponding to the SRS of the t-1 th subframe according to the historical accumulated timing adjustment to obtain the estimated value of the channel coefficient corresponding to the SRS of the t-1 th subframe after the timing adjustment compensation, comprising:

The network device calculates the historical accumulated timing adjustment amount according to a timing adjustment amount delta tau (n) corresponding to SRS of a subframe before the t-th subframe, wherein n=1, 2, …, t-1

The network equipment is according to thePerforming timing adjustment amount compensation on the estimated value of the channel coefficient corresponding to the SRS of the t-1 sub-frame by the following formula to obtain the estimated value +.>

The K is the total subcarrier number of SRS;

wherein H is _k And (t-1) is an estimated value of a channel coefficient corresponding to the SRS of the t-1 th subframe.

7. The method of claim 6, wherein the network device performing phase compensation on the estimated value of the channel coefficient compensated by the timing adjustment corresponding to the SRS of the t-1 th subframe according to the historical accumulated phase difference to obtain the estimated value of the channel coefficient compensated by the second time corresponding to the SRS of the t-1 th subframe, includes:

the network equipment performs a phase difference according to the SRS corresponding to the subframe before the t-th subframen=1, 2, …, t-1, calculated history accumulated phase difference +.>

The network equipment is according to theTiming adjustment corresponding to SRS of the t-1 th subframe is performed through the following formula Estimate of the channel coefficient after the whole compensation +.>Performing phase compensation to obtain an estimated value of the channel coefficient after the second compensation corresponding to SRS of the t-1 sub-frame>

8. The method of claim 7, wherein the network device performs channel prediction according to N of the estimated values of the channel coefficients after the second compensation corresponding to the SRS of the subframe before the t subframe, to obtain the predicted value of the channel coefficient corresponding to the SRS of the t subframe, including:

the network equipment compensates the estimated value of the channel coefficient after the second time corresponding to the SRS of the subframe before the t-th subframeIn (2), n=1, 2, …, t-1, k=0, 1, …, K-1, obtaining a predicted value +.>

9. The method of claim 8, wherein the network device performing timing adjustment compensation on the estimated value of the channel coefficient corresponding to the SRS of the t subframe according to the estimated values of the timing adjustment amounts of the t subframe and the t-1 subframe to obtain the estimated value of the channel coefficient after the timing adjustment amount compensation corresponding to the SRS of the t subframe, comprises:

the network device estimates the timing adjustment amount according to the t-th subframe and the t-1 th subframe Estimating a channel coefficient H corresponding to the SRS of the t subframe according to the following formula _k (t) compensating the timing adjustment amount to obtain an estimated value +_of the channel coefficient after the timing adjustment amount compensation corresponding to the SRS of the t-th subframe>

The network device performs phase compensation on the estimated value of the channel coefficient compensated by the timing adjustment corresponding to the SRS of the t subframe according to the estimated value of the phase difference between the t subframe and the t-1 subframe, to obtain the estimated value of the channel coefficient compensated for the first time corresponding to the SRS of the t subframe, including:

the network device estimates the phase difference between the t-th subframe and the t-1 th subframeThe +.>Performing phase compensation to obtain an estimated value +_of the channel coefficient after the first compensation corresponding to the SRS of the t-th subframe>

10. The method of claim 8, wherein the network device determining the estimated value of the timing adjustment for the t-th subframe and the t-1 th subframe from the predicted value of the channel coefficient corresponding to the SRS for the t-th subframe and the estimated value of the channel coefficient corresponding to the SRS for the t-th subframe comprises:

the network equipment predicts the value of the channel coefficient corresponding to the SRS of the t subframe An estimated value H of a channel coefficient corresponding to SRS of the t-th subframe _k (t) determining said ++by the formula>

Wherein ( ^* Representing the complex conjugate.

11. The method of claim 8, wherein the network device determining the estimated value of the phase difference between the t-th subframe and the t-1 th subframe according to the predicted value of the channel coefficient corresponding to the SRS of the t-th subframe and the estimated value of the channel coefficient compensated by the timing adjustment corresponding to the SRS of the t-th subframe, comprises:

the network equipment predicts the value of the channel coefficient corresponding to the SRS of the t subframeAnd said->The +.>

Where angle (·) represents the phase of the complex number.

12. A network device, comprising:

a receiving module, configured to receive measurement information corresponding to a sounding reference signal SRS of a t-1 th subframe from a terminal device, where the measurement information includes a timing adjustment amount and a phase difference, and t is greater than or equal to 2;

The receiving module is further configured to: receiving an SRS of a t subframe from the terminal equipment;

13. The network device of claim 12, wherein the receiving module is further configured to:

receiving measurement information corresponding to SRS of the t subframe;

the processing module is further configured to: according to the measurement information corresponding to the SRS of the t subframe and the measurement information corresponding to the SRS of the subframe before the t subframe, performing timing adjustment quantity compensation and phase compensation on the estimated value of the channel coefficient corresponding to the SRS of the t subframe to obtain the estimated value of the channel coefficient after the second compensation corresponding to the SRS of the t subframe;

14. The network device of claim 12 or 13, wherein the channel prediction module comprises:

a compensation unit, configured to perform timing adjustment compensation and phase compensation on an estimated value of a channel coefficient corresponding to an SRS of the t-1 th subframe according to measurement information corresponding to an SRS of a subframe preceding the t-1 th subframe, obtain an estimated value of a channel coefficient corresponding to an SRS of the t-1 th subframe after second compensation, and store the estimated value of the channel coefficient corresponding to the SRS of the t-1 th subframe after second compensation;

and the channel prediction unit is used for carrying out channel prediction according to N of the estimated values of the channel coefficients after the second compensation corresponding to the SRS of the subframe before the t subframe to obtain the predicted value of the channel coefficient corresponding to the SRS of the t subframe, wherein N is a preset positive integer, and the estimated values of the channel coefficients after the second compensation corresponding to the SRS of the N subframes comprise the estimated values of the channel coefficients after the second compensation corresponding to the SRS of the t-1 subframe.

15. The network device according to claim 14, wherein the compensation unit is specifically configured to:

performing timing adjustment amount compensation on the estimated value of the channel coefficient corresponding to the SRS of the t-1 th subframe according to a historical accumulated timing adjustment amount to obtain the estimated value of the channel coefficient after the timing adjustment amount compensation corresponding to the SRS of the t-1 th subframe, wherein the historical accumulated timing adjustment amount is the sum of the timing adjustment amounts corresponding to the SRS of subframes before the t-1 th subframe;

16. The network device of any of claims 12-15, wherein the processing module comprises:

a first determining unit, configured to determine an estimated value of the timing adjustment amounts of the t-th subframe and the t-1 th subframe according to a predicted value of a channel coefficient corresponding to the SRS of the t-th subframe and an estimated value of a channel coefficient corresponding to the SRS of the t-th subframe;

The first compensation unit is configured to perform timing adjustment compensation on an estimated value of a channel coefficient corresponding to the SRS of the t subframe according to the estimated values of the timing adjustment amounts of the t subframe and the t-1 subframe, so as to obtain an estimated value of the channel coefficient after the timing adjustment amount compensation corresponding to the SRS of the t subframe:

a second determining unit, configured to determine an estimated value of a phase difference between the t-th subframe and the t-1 th subframe according to the predicted value of the channel coefficient corresponding to the SRS of the t-th subframe and the estimated value of the channel coefficient compensated by the timing adjustment amount corresponding to the SRS of the t-th subframe;

and the second compensation unit is used for carrying out phase compensation on the estimated value of the channel coefficient after the timing adjustment compensation corresponding to the SRS of the t subframe according to the estimated value of the phase difference between the t subframe and the t-1 subframe, so as to obtain the estimated value of the channel coefficient after the first compensation corresponding to the SRS of the t subframe.

17. The network device according to claim 15, wherein the compensation unit is specifically configured to:

calculating the historical cumulative timing adjustment amount according to a timing adjustment amount delta tau (n) corresponding to SRS of a subframe before the t-th subframe, wherein n=1, 2, …, t-1

According to the describedPerforming timing adjustment amount compensation on the estimated value of the channel coefficient corresponding to the SRS of the t-1 sub-frame by the following formula to obtain the estimated value +.>

The K is the total subcarrier number of SRS;

18. The network device according to claim 16, wherein the compensation unit is specifically configured to:

According to the describedAn estimated value of the channel coefficient compensated by the timing adjustment corresponding to the SRS of the t-1 sub-frame is +.>Performing phase compensation to obtain an estimated value of the channel coefficient after the second compensation corresponding to SRS of the t-1 sub-frame>

19. The network device according to claim 14, wherein the channel prediction unit is specifically configured to:

according to the estimated value of the channel coefficient after the second compensation corresponding to the SRS of the subframe before the t-th subframeIn (2), n=1, 2, …, t-1, k=0, 1, …, K-1, obtaining a predicted value +. >

20. The network device of claim 19, wherein the first compensation unit is specifically configured to:

an estimated value of a timing adjustment amount according to the t-th subframe and the t-1 th subframeBy the following formula pairAn estimated value H of a channel coefficient corresponding to SRS of the t-th subframe _k (t) compensating the timing adjustment amount to obtain an estimated value +_of the channel coefficient after the timing adjustment amount compensation corresponding to the SRS of the t-th subframe>

The second compensation unit is specifically configured to:

an estimated value according to the phase difference between the t-th subframe and the t-1 th subframeThe +.>Performing phase compensation to obtain an estimated value +_of the channel coefficient after the first compensation corresponding to the SRS of the t-th subframe>

21. The network device of claim 19, wherein the first determining unit is specifically configured to:

according to the predicted value of the channel coefficient corresponding to the SRS of the t subframeAn estimated value H of a channel coefficient corresponding to SRS of the t-th subframe _k (t) determining said ++by the formula>

Wherein ( ^* Representing the complex conjugate.

22. The network device of claim 19, wherein the second determining unit is specifically configured to:

according to the predicted value of the channel coefficient corresponding to the SRS of the t subframe And said->The +.>

Where angle (·) represents the phase of the complex number.

23. A network device, comprising:

a processor; and

a memory for storing executable instructions of the processor;

wherein the processor is configured to perform the channel prediction method of any of claims 1-11 via execution of the executable instructions.

24. A readable storage medium having stored therein execution instructions, characterized in that when executed by at least one processor of a network device, the network device performs the channel prediction method of any of claims 1-11.