WO2021097679A1

WO2021097679A1 - Communication method and apparatus

Info

Publication number: WO2021097679A1
Application number: PCT/CN2019/119503
Authority: WO
Inventors: 王婷; 黄逸; 张瑞; 周国华
Original assignee: 华为技术有限公司
Priority date: 2019-11-19
Filing date: 2019-11-19
Publication date: 2021-05-27
Also published as: CN114642017A

Abstract

A communication method and apparatus, relating to the technical field of communications, for use in improving reliability for a terminal moving at a high speed in an LOS environment to receive a signal. The method comprises: a network device receives a first pilot signal group from a first terminal within a first time unit and receives a second pilot signal group from the first terminal within a second time unit, and then sends a first signal to the first terminal. Moreover, a transmitting beam of the first signal is determined according to the first pilot signal group and the second pilot signal group, and the first time unit is different from the second time unit. The technical solution helps to improve the possibility of aligning the transmitting beam of the network device with a receiving beam of the terminal, thereby improving the reliability for the terminal to receive the signal sent by the network device.

Description

Communication method and device

Technical field

This application relates to the field of wireless communication technology, and in particular to a communication method and device.

Background technique

The base station can use the transmit beam to transmit signals to the terminal. In the prior art, the transmission beam used by the base station to send a signal to the terminal is determined by the base station according to the pilot signal sent by the terminal, or determined by the base station according to feedback information of the terminal. This technical solution is generally applicable to terminals that move at low speeds in a non-line of sight (NLOS) environment, such as mobile phones, tablet computers, and so on. However, for a terminal moving at high speed in a line of sight (LOS) environment, such as an unmanned aerial vehicle (UAV) flying in the air, if the existing technology is used to determine the transmission used by the base station to send a signal to the terminal Beams, so that the terminal may not be able to receive the signal sent by the base station using the determined transmission beam, resulting in poor reliability of communication between the base station and the terminal.

Summary of the invention

The present application provides a communication method and device, which help improve the reliability of signals received by a terminal moving at a high speed in a LOS environment, and improve communication performance.

In the first aspect, an embodiment of the present application provides a communication method, which specifically includes: receiving a first pilot signal group from a first terminal in a first time unit, and receiving a second pilot signal group from the first terminal in a second time unit. Pilot signal group; then, send the first signal to the first terminal, where the transmission beam of the first signal is determined according to the first pilot signal group and the second pilot signal group, the first time unit and the second time The unit is different.

In the embodiment of the present application, the network device can determine the transmission beam used to send the first signal to the terminal according to the two sets of pilot signals sent by the first terminal, and the two sets of pilot signals are the units of the terminal at different time. Sent on. This helps to increase the possibility of alignment between the transmission beam of the base station and the reception beam of the terminal, thereby improving the reliability of the terminal receiving the signal sent by the network device, and improving the communication performance.

In a possible design, first indication information is sent to the first terminal, where the first indication information is used to instruct the first terminal to send the first pilot signal group and the second pilot signal group. Through this technical solution, compared with periodically sending pilot signals, it is helpful to reduce the overhead of pilot signals and further improve communication performance. In addition, using the first indication information to instruct to send the first pilot signal group and the second pilot signal group can reduce the overhead of the indication information and improve the communication performance.

In a possible design, when the signal received power from the first terminal is less than or equal to the first threshold, the first indication information is sent to the first terminal. It should be noted that the signal received power from the first terminal refers to the received power of the signal from the first terminal received by the network device.

When the signal received power from the first terminal is less than or equal to the first threshold, the first terminal may also have poor reception performance of the network device signal. Therefore, in this case, the first terminal is triggered to send two sets of pilots Signal, readjust the sending beam for sending the signal to the first terminal, which helps to improve the reliability of the first terminal to receive the signal from the network device.

In a possible design, the transmission beam of the first signal is determined according to the first angle of arrival and the second angle of arrival, the first angle of arrival is determined according to the first pilot signal group, and the second angle of arrival is determined according to the second pilot signal group. The signal group is determined; wherein, the first angle of arrival is the angle of arrival between the first terminal and the network device in the first time unit, and the second angle of arrival is the angle of arrival between the second terminal and the network device in the second time unit The angle of arrival.

With this technical solution, the transmission beam of the first signal can be determined based on the angle of arrival between the first terminal and the network device in the first time unit and the angle of arrival between the first terminal and the network device in the second time unit, which can improve The accuracy of the transmission beam of the signal sent by the network device to the first terminal improves the reliability of the signal communicated between the network device and the first terminal, and also helps simplify the implementation.

In a possible design, the first time unit includes a first sub-time unit and a second sub-time unit, and the first pilot signal group includes a first pilot signal and a second pilot signal; The time unit receives the first pilot signal from the first terminal, and the second sub-time unit receives the second pilot signal from the first terminal. Wherein, the time interval between the first position in the first sub-time unit and the second position in the second sub-time unit is the first time interval.

By receiving pilot signals from the first terminal on different sub-time units in the first time unit, it helps to improve the accuracy of determining the angle of arrival between the first terminal and the network device in the first time unit. At the same time, the first pilot signal group and the second pilot signal group may include multiple pilot signals. This solution can meet the scenario where the first terminal has multiple transmitting beams and/or the network device has multiple receiving beams, improving the network The accuracy of the sending beam of the signal sent by the device to the first terminal improves the reliability of the signal communicated between the network device and the first terminal.

In a possible design, the second indication information is sent to the first terminal, and the second indication information is used to indicate the time between the first position in the first sub-time unit and the second position in the second sub-time unit interval.

Through the above technical solution, determining the time interval between the first sub-time unit and the second sub-time unit through the second indication information can flexibly determine the transmission time of the pilot signal, improve flexibility, and further reduce the overhead of the pilot signal. Communication performance.

In a possible design, the LOS path of the first pilot signal is the first LOS path; the angle of arrival of the first LOS path is the angle of arrival between the first terminal and the network device in the second sub-time unit; The first sub-time unit receives the second signal from the second terminal; the LOS path of the second signal is the second LOS path; when the second LOS path is different from the first LOS, the second signal is eliminated.

Through the above technical solution, it is helpful to eliminate the interference of the second signal from the second terminal in the LOS scenario, and further improve the communication performance.

In a possible design, the signal reception strength of the second signal is greater than or equal to the second threshold. Through the above technical solutions, it is helpful to eliminate the interference of large interference signal components in the LOS scenario. At the same time, the complexity of interference cancellation can be reduced, that is, only interference whose reception strength is greater than or equal to the second threshold can be eliminated.

In a possible design, the second sub-time unit and the first sub-time unit are two consecutive sub-time units in time; or,

The time interval between the second sub-time unit and the first sub-time unit is less than the coherence time of the channel; or,

The angle of arrival of the first pilot signal is the same as the angle of arrival of the second pilot signal; or,

The difference between the angle of arrival of the first pilot signal and the angle of arrival of the second pilot signal is less than or equal to the third threshold;

Among them, the angle of arrival of the first pilot signal is the angle of arrival between the first sub-time unit, the first terminal and the network device; the angle of arrival of the second pilot signal is the angle of arrival between the second sub-time unit, the first terminal and the network device. The angle of arrival between network devices.

Through the above technical solutions, it helps to simplify the implementation. At the same time, based on the relationship between the angle of arrival on the first sub-time unit and the second sub-time unit, the undisturbed pilot signal on one of the two sub-time units can be used to determine the position on the other sub-time unit. Interfere the signal, and then eliminate the interference and improve the signal reception performance.

In a possible design, the first pilot signal from the first terminal is received through the first receiving beam in the first sub-time unit; the second pilot signal from the first terminal is received through the second receiving beam in the second sub-time unit. Pilot signal.

Wherein, the first receiving beam and the second receiving beam are the same, or the first receiving beam and the second receiving beam are different.

In a possible design, the first pilot signal group includes a third pilot signal, and the second pilot signal group includes a fourth pilot signal.

In a possible design, the second indication information is sent to the first terminal, and the second indication information is used to indicate that the time interval between the first position of the first time unit and the second position of the second time unit is second time interval. It is convenient for the first terminal to determine the first time unit for sending the first pilot signal group and the second time unit for sending the second pilot signal group. Compared with the predefined method, the pilot signal group can be sent more flexibly and efficiently.

In a possible design, the second time interval is determined according to the moving speed of the first terminal. It helps to improve the reliability of the transmission beam of the first signal determined according to the first pilot signal group and the second pilot signal group. In addition, determining the second time interval based on the moving speed may consider different scenarios to select a suitable second time interval, which can further reduce the pilot overhead.

In the second aspect, an embodiment of the present application provides a communication method, which specifically includes:

The first pilot signal group is sent to the network device in the first time unit, and the second pilot signal group is sent to the network device in the second time unit; the signal sent by the transmission beam from the network device is received, and the transmission beam is based on The first pilot signal group and the second pilot signal group are determined. The first time unit is different from the second time unit.

In the embodiment of the present application, since the terminal can send the first pilot signal group to the network device in the first time unit, and send the second pilot signal group to the network device in the second time unit, the network device can be enabled according to the first pilot signal group. The frequency signal group and the second pilot signal group determine the transmission beam used to transmit signals to the terminal. This helps to increase the possibility of alignment between the transmission beam of the base station and the reception beam of the terminal, thereby improving the reliability of the terminal receiving the signal sent by the network device, and improving the communication performance.

In a possible design, the first indication information is received from the network device, and the first indication information is used to instruct the terminal to send the first pilot signal group and the second pilot signal group. Through this technical solution, compared with periodically sending pilot signals, it is helpful to reduce the overhead of pilot signals and further improve communication performance. In addition, using the first indication information to instruct to send the first pilot signal group and the second pilot signal group can reduce the overhead of the indication information and improve the communication performance.

In a possible design, after the third time unit sends the pilot signal to the network device, the timer is started to start timing; if the pilot signal is not sent to the network device before the timer expires, after the timer expires , Sending the first pilot signal group to the network device in the first time unit, and sending the second pilot signal group to the network device in the second time unit.

The timing duration of the timer may be predefined, or may be instructed by the network device, or may be determined by the terminal according to a certain algorithm or strategy, which is not limited. Specifically, the timing duration of the timer can be understood as: the duration between the end time of the timer and the start time of the timer. Help reduce the overhead of pilot signals and further improve communication performance. In addition, it can avoid the problem of poor beam tracking performance if the pilot signal is not sent for a long time, which will lead to poor communication performance.

In a possible design, the first time unit includes a first sub-time unit and a second sub-time unit, and the first pilot signal group includes a first pilot signal and a second pilot signal; The time unit sends the first pilot signal to the network device, and sends the second pilot signal to the network device in the second sub-time unit.

By sending pilot signals to the network device in different sub-time units in the first time unit, it helps to improve the accuracy of determining the angle of arrival between the first terminal and the network device in the first time unit. At the same time, the first pilot signal group and the second pilot signal group may include multiple pilot signals. This solution can meet the scenario where the first terminal has multiple transmitting beams and/or the network device has multiple receiving beams, improving the network The accuracy of the sending beam of the signal sent by the device to the first terminal improves the reliability of the signal communicated between the network device and the first terminal.

Wherein, the time interval between the first sub-time unit and the second sub-time unit is the first time interval.

In a possible design, the first pilot signal is sent to the network device through the first transmission beam in the first sub-time unit; the second pilot signal is sent to the network device through the second transmission beam in the second sub-time unit.

In a possible design, the first pilot signal group includes the third pilot signal; the second pilot signal group includes the fourth pilot signal.

In a possible design, the receiving network device sends the second indication information, and the second indication information is used to indicate that the time interval between the first position of the first time unit and the second position of the second time unit is the second time interval.

Through the above technical solution, determining the time interval between the first sub-time unit and the second sub-time unit through the second indication information can flexibly determine the transmission time of the pilot signal, improve flexibility, and further reduce the overhead of the pilot signal. Communication performance. It is convenient for the first terminal to determine the first time unit for sending the first pilot signal group and the second time unit for sending the second pilot signal group. Compared with the predefined method, the pilot signal group can be sent more flexibly and efficiently.

In a possible design, the second time interval is determined according to the moving speed of the terminal. It helps to improve the reliability of the transmission beam of the first signal determined according to the first pilot signal group and the second pilot signal group. In addition, determining the second time interval based on the moving speed may consider different scenarios to select a suitable second time interval, which can further reduce the pilot overhead.

In a third aspect, an embodiment of the present application provides an interference cancellation method, which specifically includes: receiving a signal in a first time unit, where the signal includes a first signal component and a second signal component; when the second signal component arrives When the angle satisfies the first condition, the second signal component is eliminated.

In the embodiment of the present application, since the signal component of the received signal whose angle of arrival meets the first condition can be eliminated, it is helpful to avoid the interference of the signal component whose angle of arrival meets the first condition.

In a possible design, the signal reception strength of the second signal component is greater than or equal to the first threshold. Through the above technical solution, it is helpful to eliminate the interference that interferes with the larger signal component. At the same time, the complexity of interference cancellation can be reduced, that is, only interference whose reception strength is greater than or equal to the first threshold can be eliminated.

In a possible design, the arrival angle of the second signal component can meet the first condition in the following manner:

The angle of arrival of the second signal component is greater than or equal to the second threshold; or,

The angle of arrival of the second signal component is within the first range; or,

The angle of arrival of the second signal is the angle of arrival of the signal sent by the air terminal; or,

The angle of arrival of the second signal component is not the angle of arrival of the signal sent by the ground terminal.

In a fourth aspect, an embodiment of the present application also provides an interference cancellation method, which specifically includes:

The first signal is received in the first time unit; wherein, the first signal includes a first signal component and a second signal component; when the second LOS path is different from the first LOS path, the second signal is eliminated Signal component. The angle of arrival of the first LOS path is the angle of arrival of the second signal received in the second time unit; the LOS path of the second signal component is the second LOS path.

For example, if the first LOS path is different from the second LOS path, it can be understood that: the arrival angle 1 is different from the arrival angle 2, or the difference between the arrival angle 1 and the arrival angle 2 is not within the error range. Among them, the angle of arrival 1 is the angle of arrival of the first LOS path, that is, the angle of arrival of the second signal received in the second time unit, that is, the angle of arrival between the first terminal and the network device in the second time unit; Angle 2 is the arrival angle of the second LOS path, that is, the arrival angle between the second terminal and the network device in the first time unit.

Among them, the LOS of the first signal component is the first LOS path. It can be understood that the arrival angle 3 is the same as the arrival angle 1, or the difference between the arrival angle 3 and the arrival angle 1 is within the error range. The angle of arrival 3 is the angle of arrival of the first signal component, that is, the angle of arrival between the first terminal and the network device in the first time unit.

In the embodiment of the present application, since the signal component of the received signal whose LOS is not the first LOS path can be eliminated, it is helpful to eliminate interference from other terminals in the LOS environment.

In a possible design, the signal reception intensity of the second signal component is greater than or equal to the first threshold. Through the above technical solution, it is helpful to eliminate the interference that interferes with the larger signal component. At the same time, the complexity of interference cancellation can be reduced, that is, only interference whose reception strength is greater than or equal to the first threshold can be eliminated.

In a possible design, the first LOS path is determined according to the second signal.

In a possible design, the second time unit and the first time unit are two consecutive time units in time; or,

The time interval between the second time unit and the first time unit is less than the coherence time of the channel; or,

The angle of arrival of the first signal component is the same as the angle of arrival of the second signal; or,

The difference between the angle of arrival of the first signal component and the angle of arrival of the second signal is less than or equal to a second threshold;

The angle of arrival of the first signal component is the angle of arrival between the first terminal and the network device in the first time unit; the angle of arrival of the second signal is the angle of arrival of the first terminal in the second time unit The angle of arrival with the network device.

Through the above technical solutions, it helps to simplify the implementation. At the same time, based on the relationship between the angle of arrival on the first time unit and the second time unit, the interference signal on the other time unit can be determined based on the undisturbed pilot signal on one time unit of the two time units, and then Eliminate interference and improve signal reception performance.

In a fifth aspect, an embodiment of the present application provides a device, the device includes a processor, and is configured to implement the methods described in each of the foregoing aspects. The device may also include a memory for storing instructions and data. The memory is coupled with the processor, and when the processor executes the program instructions stored in the memory, the above aspects and any possible design description method for each aspect can be implemented. The device may also include a communication interface, which is used for the device to communicate with other devices. Exemplarily, the communication interface may be a transceiver, circuit, bus, module, or other type of communication interface, and other devices may be Network equipment or terminal equipment, etc.

In one possible design, the device includes:

Memory, used to store program instructions;

The processor is configured to call instructions stored in the memory, so that the device executes any possible design method of the first aspect and the first aspect of the embodiments of the present application, or causes the device to execute the second aspect of the embodiments of the present application The method of design.

In a sixth aspect, the embodiments of the present application also provide a computer-readable storage medium, including instructions, which when run on a computer, cause the computer to execute the foregoing aspects and any possible design method of each aspect.

In a seventh aspect, an embodiment of the present application further provides a chip system. The chip system includes a processor and may also include a memory, which is used to implement various aspects and any possible design method of each aspect. The chip system can be composed of chips, or it can include chips and other discrete devices.

In an eighth aspect, the embodiments of the present application also provide a computer program product, including instructions, which when run on a computer, cause the computer to execute each aspect and any possible design method of each aspect.

In addition, the technical effects brought by any one of the possible design methods of the fifth aspect to the eighth aspect can be referred to the technical effects brought about by different design methods in the method section, which will not be repeated here.

Description of the drawings

FIG. 1 is a schematic diagram of a time unit according to an embodiment of the application;

2 is a schematic diagram of a network architecture of a communication system according to an embodiment of the application;

FIG. 3 is a schematic flowchart of a communication method according to an embodiment of the application;

FIG. 4 is a schematic diagram of another time unit according to an embodiment of the application;

FIG. 5 is a schematic diagram of a position in a time unit according to an embodiment of the application;

FIG. 6 is a schematic diagram of a beam tracking process according to an embodiment of the application;

FIG. 7 is a schematic diagram of another time unit according to an embodiment of the application;

FIG. 8 is a schematic diagram of another beam tracking process according to an embodiment of the application;

FIG. 9 is a schematic diagram of another beam tracking process according to an embodiment of the application;

FIG. 10 is a schematic diagram of another beam tracking process according to an embodiment of the application;

FIG. 11 is a schematic diagram of a communication scenario according to an embodiment of the application;

FIG. 12 is a schematic flowchart of an interference cancellation method according to an embodiment of this application;

FIG. 13 is a schematic diagram of another communication scenario according to an embodiment of the application;

FIG. 14 is a schematic flowchart of another interference cancellation method according to an embodiment of this application;

FIG. 15 is a schematic structural diagram of a device according to an embodiment of the application;

FIG. 16 is a schematic structural diagram of another device according to an embodiment of the application.

Detailed ways

It should be understood that “at least one” in the embodiments of the present application refers to one or more. "Multiple" means two or more. "And/or" describes the association relationship of the associated objects, indicating that there can be three types of relationships. For example, A and/or B can mean that A exists alone, A and B exist at the same time, and B exists alone. Among them, A and B can be singular or plural. The character "/" generally indicates that the associated objects before and after are in an "or" relationship. "The following at least one (item)" or similar expressions refers to any combination of these items, including any combination of single item (item) or plural items (item). For example, at least one of a, b, or c can represent: a, b, c, a and b, a and c, b and c, or a, b and c. Among them, each of a, b, and c can be an element itself, or a collection containing one or more elements.

In this application, "exemplary", "in some embodiments", "in other embodiments", etc. are used to represent examples, illustrations, or illustrations. Any embodiment or design solution described as an "example" in this application should not be construed as being more preferable or advantageous than other embodiments or design solutions. To be precise, the term example is used to present the concept in a concrete way.

In this application, "of" and "corresponding" may sometimes be used together. It should be pointed out that when the differences are not emphasized, the meanings to be expressed are the same. In the embodiments of this application, communication and transmission can sometimes be used together. It should be noted that, without emphasizing the difference, the meanings expressed are the same. For example, transmission can include sending and/or receiving, and can be a noun or a verb.

It should be pointed out that the terms "first" and "second" involved in the embodiments of this application are only used for the purpose of distinguishing description, and cannot be understood as indicating or implying relative importance, nor shall they be understood as indicating or implying. order.

In order to improve the reliability of receiving the signals sent by the network equipment by the terminal moving at a high speed in the LOS environment, an embodiment of the present application provides a communication method so that the network equipment can determine the signal to be sent to the terminal according to the two sets of pilot signals sent by the terminal. The transmit beam used by the first signal. Among them, the two sets of pilot signals are sent by the terminal in different time units. This helps to increase the possibility of alignment of the transmission beam of the base station with the reception beam of the terminal, thereby improving the reliability of the terminal receiving the signal sent by the network device, and improving the communication performance.

The following explains some of the terms involved in the embodiments of the present application to facilitate the understanding of those skilled in the art.

1. LOS environment. The LOS environment refers to a relatively stable and simple channel environment without obstructions. For example, the channel environment in the air. In the case of obstacles, signals may be transmitted through reflection, scattering, and diffraction. The channel environment is relatively complex and unstable. Usually, the relatively complex channel environment with obstacles is called the NLOS environment. LOS can also be called line-of-sight, and NLOS can also be called non-line-of-sight.

2. Terminal. In the embodiments of the present application, the terminal is a device with a wireless transceiver function, which may be called a terminal device, a user equipment (UE), a mobile station (MS), a mobile terminal (MT), and so on. Among them, the terminal of the embodiment of the present application can move at a high speed in the LOS environment. It should be noted that the high speed in the embodiment of the present application can be understood as the moving speed not less than a certain threshold. For example, the threshold may be 100 meters/second, 120 meters/second, etc., may be predefined through a communication protocol, or determined by the terminal according to a preset algorithm or rule, which is not limited. For example, the specific form of the terminal may be UAV, airborne terminal, airplane, high-speed rail, vehicle-mounted terminal, and so on. Specifically, UAV can be understood as a kind of aircraft that uses radio equipment to remote control or comes with its own program control. It should be noted that the terminal can support at least one wireless communication technology, such as long term evolution (LTE), new radio (NR), future communication technology, and so on.

3. Network equipment. The network device in the embodiment of the application is a device that provides a wireless access function for a terminal, and may also be referred to as an access network device, a radio access network (radio access network, RAN) device, and so on. Among them, the network device may support at least one wireless communication technology, such as LTE, NR, and future communication technology. For example, the network equipment includes but is not limited to: next-generation base station (gNB), evolved node B (evolved node B, eNB), and wireless network in the fifth-generation mobile communication system (5th-generation, 5G) Controller (radio network controller, RNC), node B (node B, NB), base station controller (BSC), base transceiver station (BTS), home base station (for example, home evolved node B) , Or home node B, HNB), baseband unit (BBU), transmitting and receiving point (TRP), transmitting point (TP), mobile switching center, small station, micro station, etc. The network device can also be a wireless controller, a centralized unit (CU), and/or a distributed unit (DU) in a cloud radio access network (CRAN) scenario, or the network device can They are relay stations, access points, in-vehicle devices, terminals, wearable devices, and network devices in future mobile communications or network devices in the future evolved public mobile land network (PLMN).

4. Time unit. The time unit in the embodiment of the present application refers to a period of time in the time domain, and may include one or more sub-time units. Among them, the sub-time unit may be a basic time unit or an atomic time unit. Among them, a basic time unit is usually composed of one or more atomic time units. For example, in the time domain, the communication between the terminal and the network device takes the basic time unit as a unit. For example, the basic time unit can be a radio frame, subframe, slot, micro-slot, mini-slot, or symbol, etc., but nothing is done. limited. The atomic time unit may be a time unit with a smaller granularity than the specified basic time unit. For example, if the basic time unit is a time slot, the atomic time unit can be a symbol. For another example, if the basic time unit is a subframe, the atomic time unit may be a time slot, a symbol, or the like. It should be noted that in the embodiments of the present application, the duration of different basic time units may be the same or different, which is not limited. For example, different subcarrier intervals correspond to basic time units of different durations. Take the time slot as the basic time unit as an example. For example, when the subcarrier interval is 15kHz, the duration of one time slot can be 1ms; when the subcarrier interval is 30kHz, the duration of one time slot can be 0.5ms.

For example, a time unit is a basic time unit and includes one or more sub-time units. In this case, the sub-time units are atomic time units. For example, taking the basic time unit as a time slot as an example, a time unit is a time slot, including 14 symbols. In this case, the sub-time unit is a symbol. As another example, one time unit may include multiple basic time units. In this case, the sub-time unit may be a basic time unit or an atomic time unit. For example, taking the basic time unit as a radio frame as an example, one time unit includes multiple radio frames, and one radio frame includes 10 subframes. In this case, the sub-time unit is a radio frame or sub-frame. For another example, taking the basic time unit as a subframe as an example, one time unit includes multiple subframes, one subframe includes one or more time slots, and one time slot includes one or more symbols. In this case, the sub-time unit is a sub-frame, or a time slot, or a symbol. For another example, taking the basic time unit as a time slot as an example, one time unit includes multiple time slots, and one time slot includes one or more symbols. In this case, the sub-time unit is a time slot or symbol.

As another example, when a basic time unit is composed of an atomic time unit, for example, if a basic time unit is a symbol, then a time unit may include one or more symbols, and the sub-time unit is a symbol. For another example, if a basic time unit is a time slot, then a time unit may include one or more time slots, and the sub-time unit is a time slot. A time slot is composed of multiple symbols, and the atomic time unit can be a symbol.

In addition, it should be noted that the duration of different time units in the embodiments of the present application may be different or the same, which is not limited.

5. Pilot signal. It may also be referred to as a reference signal (reference signal, RS). The pilot signal can be used for channel sounding, channel measurement, cell selection, cell reselection, or open-loop power control. For example, the pilot signal can be a channel sounding reference signal (sounding reference signal, SRS), a demodulation reference signal (demodulation reference signal, DMRS), a channel state information reference signal (channel state information-reference signal, CSI-RS), tracking The reference signal (Tracking reference signal, TRS), or other reference signal that can be used for beam tracking, is not limited.

It should be understood that the pilot signal carries information through the pilot sequence, that is, the pilot sequence is a part of the pilot signal, and the pilot sequences of different pilot signals are different.

6. Pilot signal group. In the embodiment of the present application, the pilot signal group is a group of pilot signals, and the group of pilot signals is carried on the same time unit. Among them, a pilot signal group may include N pilot signals, and the value of N may be 1, or a positive integer greater than 1. For example, the value of N may be related to whether directional transmission or omnidirectional transmission is adopted between the terminal and the network device. For example, omni-directional transmission is used between the terminal and the network device, that is, the terminal sends the pilot signal omni-directionally, and the network device receives the pilot signal omni-directionally, then the value of N can be 1, that is, One pilot signal is carried on one time unit. For another example, the terminal sends pilot signals in omnidirectional transmission, and the network equipment uses M different receiving beams to receive the pilot signals directionally, then the value of N can be less than or equal to M, for example, one time unit can carry M pilots signal. Further, the terminal uses K transmit beams to send pilot signals directionally, and the network equipment uses M different receive beams to receive pilot signals directionally, then the value of N can be less than or equal to M×K, for example, a time unit can carry M ×K pilot signals. For another example, the terminal uses K transmit beams to send pilot signals directionally, and the network equipment receives the pilot signals omnidirectionally, then the value of N can be less than or equal to K, for example, one time unit can carry K pilot signals . Among them, M and K are positive integers.

Wherein, when multiple pilot signals are carried on one time unit, the multiple pilot signals are usually carried on different sub-time units. For example, taking the time unit i shown in FIG. 1 as an example, the pilot signal group i includes a pilot signal i1 and a pilot signal i2. The pilot signal i1 is carried on the sub-time unit i1, and the pilot signal i2 is carried on the sub-time unit i1. On time unit 2, sub-time unit i1 and sub-time unit i2 are two sub-time units included in time unit i. It should be noted that the pilot sequences of different pilot signals belonging to a pilot signal group may be the same or different; or, the pilot sequences of pilot signals belonging to different pilot signal groups may be The same can also be different, which is not limited. For example, there may be a predefined relationship or an indicated relationship between the pilot sequences of two different pilot signals. In addition, the pilot sequence of the pilot signal may be determined by the terminal according to a certain algorithm or strategy, or may be notified to the terminal by the network device through signaling. For example, the terminal can randomly determine the pilot sequence of the pilot signal.

In addition, it should be noted that the number of pilot signals carried on different time units in the embodiment of the present application may be the same or different, which is not limited.

7. LOS trail. The LOS path in the embodiments of the present application refers to a linear propagation path between the transmitting end and the receiving end of the wireless signal without obstruction in the LOS environment.

The embodiments of the present application can be applied to LTE communication systems, NR communication systems, and other communication systems, such as future mobile communication systems (such as 6G communication systems). As an example, as shown in FIG. 2, it is a schematic diagram of a network architecture of a communication system according to an embodiment of the application, including network equipment and terminals.

It should be noted that, in the embodiments of this application, the network device and the terminal can communicate through a licensed spectrum, or communicate through an unlicensed spectrum, and can also communicate through a licensed spectrum and an unlicensed spectrum at the same time. There is no restriction on communication. The network device and the terminal can communicate through a frequency spectrum below 6 gigahertz (gigahertz, GHz), or communicate through a frequency spectrum above 6 GHz, or communicate using a frequency spectrum below 6 GHz and a frequency spectrum above 6 GHz at the same time. That is, this application is applicable to both low-frequency scenes (for example, sub 6G) and high-frequency scenes (above 6G).

It should be understood that the network architecture of the communication system shown in FIG. 2 is only an example, and does not limit the network architecture of the communication system in the embodiment of the present application. The embodiments of the present application do not limit the number of network devices and the number of terminals in the communication system. For example, when the communication system of the embodiment of the present application includes multiple network devices, the network device and the network device can communicate with each other. For example, the communication system includes multiple macro base stations and multiple micro base stations. Among them, the macro base station and the macro base station, the micro base station and the micro base station, and the macro base station and the micro base station can perform multi-point coordinated communication. For example, when the communication system of the embodiment of the present application includes multiple terminals, sidelink communication may be performed between the terminals and the terminals. The communication method in the embodiment of the present application is applicable to the above-mentioned multiple communication systems.

Taking the network architecture of the communication system shown in FIG. 2 as an example, the communication method of the embodiment of the present application will be described in detail.

As an example, as shown in FIG. 3, a schematic diagram of a communication method provided in an embodiment of this application specifically includes the following steps.

Step 301: The first terminal sends a first pilot signal group to a network device in a first time unit.

Specifically, in the embodiment of the present application, the first terminal sends the first pilot signal group to the network device in the first time unit, which can be understood as: the first terminal carries the first pilot signal group on the first time unit Sent to the network device.

Wherein, the position used to carry the first pilot signal in the first time unit may be predefined, or may be notified to the first terminal by the network device through signaling, which is not limited.

Step 302: The first terminal sends a second pilot signal group to the network device in a second time unit. Among them, the first time unit is different from the second time unit.

Specifically, when the first terminal sends the second pilot signal group to the network device in the second time unit, it can be understood that: the first terminal carries the second pilot signal group on the second time unit and sends it to the network device. Wherein, the position used to carry the second pilot signal in the second time unit may be predefined, or may be notified by the network device to the first terminal through signaling, which is not limited.

It should be noted that the relevant description of the first time unit and the second time unit can refer to the above-mentioned relevant explanation of the time unit, which will not be repeated here.

Specifically, the first time unit and the second time unit are different, which can be understood as: the time period carrying the first pilot signal group in the first time unit is different from the time period carrying the second pilot signal group in the second time unit. overlapping. It should be noted that for the first time unit and the second time unit, there may or may not be an overlapping part, which is not limited. For example, as shown in FIG. 4, the first time unit includes a time period a1, a time period a2, and a time period a3, and the second time unit includes a time period b1, a time period b2, and a time period b3. For example, time period a1 and time period a2 are time periods used to carry the first pilot signal group, time period b1 and time period b2 are time periods used to carry the second pilot signal group, time period a1 and time period a2, there is no overlap with the time period b1 and the time period b2, that is, the time period a1 and the time period a2 do not overlap with the time period b1 and the time period b2. However, the time period a3 and the time period b3 may have overlapping parts or overlapping parts, that is, the time period a3 and the time period b3 may or may not overlap, which is not limited.

Step 303: The network device receives the first pilot signal group in the first time unit, receives the second pilot signal group in the second time unit, and sends the first signal to the first terminal. Wherein, the transmission beam of the first signal is determined according to the first pilot signal group and the second pilot signal group.

In some embodiments, the network device determines the first angle of arrival according to the first pilot signal group; and determines the second angle of arrival according to the second pilot signal group. Then, the network device determines the transmission beam of the first signal according to the first angle of arrival and the second angle of arrival. Wherein, the first angle of arrival is the angle of arrival between the first time unit, the first terminal and the network device; the second angle of arrival is the angle of arrival between the second time unit, the first terminal and the network device.

For example, the network device may determine the first angle of arrival according to the first pilot signal in the first pilot signal group; and determine the second angle of arrival according to the second pilot signal in the second pilot signal group. Then, the network device determines the angular velocity of the movement of the first terminal according to the first angle of arrival and the second angle of arrival, and then determines the precoding matrix according to the angular velocity of the movement of the first terminal. Finally, the first signal is multiplied by the precoding matrix to form a transmission beam of the first signal, so that the first terminal can send the first signal to the network device.

For example, if the first pilot signal group includes multiple pilot signals, the first pilot signal may be the pilot signal with the highest signal received power or strength in the first pilot signal group. For another example, if the first pilot signal group includes one pilot signal, the first pilot signal is the pilot signal included in the first pilot signal group. It should be noted that the algorithm used in the embodiment of the present application to determine the angle of arrival based on the pilot signal may be a multi-signal classification (MUSIC) algorithm, a Root-MUSIC algorithm, or a signal parameter estimation based on rotation invariance technology ( estimating signal parameters via rotational invariance techniques, ESPRIT) algorithms, etc., which are not limited.

Take the example that the network device receives the first pilot signal on the symbol s1 in the first time unit, and receives the second pilot signal on the symbol s2 in the second time unit. It should be noted that the angle of arrival between the first terminal and the network device at symbol s1 is the first angle of arrival, and the angle of arrival between the first terminal and the network device at symbol s2 is the second angle of arrival. For example, the first arrival angle includes φ(s1) and θ(s1), where φ(s1) is the horizontal angle between the first terminal of symbol s1 and the network device, and θ(s1) is the first terminal of symbol s1 The vertical angle with the network device; the second angle of arrival includes φ(s2) and θ(s2), where φ(s2) is the horizontal angle between the first terminal and the network device in the symbol s2, θ(s2) Is the vertical angle between the first terminal and the network device at symbol s2.

Among them, the angular velocity v _{φ of the} terminal moving in the horizontal direction satisfies Expression 1, and the angular velocity of the terminal moving in the vertical direction satisfies Expression 2:

N _s1 represents the sequence number of the symbol s1, N _s2 represents the sequence number of the symbol s2, and T _s represents the duration of one symbol.

According to v _φ and v _θ , the horizontal angle φ between the first terminal and the network device in the symbol s and the vertical angle θ between the first terminal and the network device can be predicted, where φ satisfies expression 3 and θ satisfies the expression 4.

φ=φ(s2)+(N _s -N _s2 )T _s v _φ Expression 3

θ=θ(s2)+(N _s -N _s2 )T _s v _θ Expression 4

N _s represents the sequence number of the symbol s. Among them, N _s > N _s2 > N _s1 , that is, the symbol s is located after the symbol s2, and the symbol s2 is located after the symbol s1.

The precoding matrix w _{p, q} satisfies expression 5:

Among them, a(φ,θ) is the steering vector, Δd is the antenna spacing, λ is the wavelength, M is the total number of horizontal antennas, and N is the total number of vertical antennas. It can be understood that the total number of horizontal antennas is M, the total number of vertical antennas is N, and the antennas of the network equipment are M*N area arrays.

Taking the predicted horizontal angle φ between the first terminal and the network device at the symbol s and the vertical angle θ between the first terminal and the network device into expression 5, the precoding matrix w _{p at the symbol s is obtained, q} . Among them, the precoding matrix w _{p, q} of the symbol s is used as the precoding matrix of the time unit where the symbol s is located. Then, the precoding matrix w _{p, q} is multiplied by the first signal to form a transmission beam of the first signal.

The foregoing is only an example of a specific method for determining the transmission beam of the first signal, and does not constitute a limitation to the embodiment of the present application. In the embodiment of the present application, the transmission beam of the first signal may also be determined by other methods.

In the embodiment of the present application, the first terminal may periodically, and/or trigger by a timer, and/or trigger by an event to send the first pilot signal group and the second pilot signal group to the network device. Wherein, the first pilot signal group is carried on the first time unit, and the second pilot signal group is carried on the second time unit. It is understandable that the first terminal sends the first pilot signal group and the second pilot signal group to the network device through a timer or event trigger, and periodically triggers the sending of the first pilot signal group and the second pilot signal group to the network device. Compared with the frequency signal group, it helps to reduce the signaling overhead.

As an example, a way of triggering the first terminal to send the first pilot signal and the second pilot signal to the network device through a timer is:

After sending the pilot signal to the network device in the third time unit, the first terminal starts the timer to start counting. If the first terminal does not send the pilot signal to the network device before the timer expires, the first terminal sends the first pilot signal group and the second pilot signal group to the network device when the timer expires. For example, the timing duration of the timer is 10 seconds, or 20 seconds, etc., which may be predefined, or determined by the first terminal according to a certain algorithm, or may be instructed by the network device to the first terminal. limited. For example, the timing duration of a timer can be understood as: the duration between the start time of the timer and the end time of the timer. Among them, the pilot transmission time can be understood as the start time of the timer. When the timer timing meets the timing duration, the end time of the timer timing can be understood as the time at which the first terminal needs to send the pilot signal to the network device.

It should be understood that the third time unit is before the first time unit and the second time unit.

For example, the event that triggers the first terminal to send the first pilot signal group and the second pilot signal group to the network device may be: the first terminal receives the first indication information from the network device. The first indication information is used to instruct the first terminal to send the first pilot signal group and the second pilot signal group.

Specifically, the network device sends the first instruction information to the first terminal. After receiving the first instruction information sent by the network device, the first terminal sends the first pilot signal group to the network device in the first time unit and the first terminal The second time unit sends the second pilot signal group to the network device. For example, the network device may send the first indication information to the first terminal through an event trigger. For example, the network device may send the first indication information to the network device when detecting that the received power of the first signal is less than or equal to the first threshold. The first signal received power is the received power of the signal from the first terminal received by the network device. For example, the first threshold may be XdB, and X may be a real number or an integer. When the first signal received power is less than or equal to the first threshold, for the network device, the signal received power of the first terminal is low, which may be caused by the misalignment of the network device's transmit beam and the first terminal's receive beam Therefore, when the network device detects that the received power of the first signal is less than or equal to the first threshold, it sends the first indication information to the first terminal, triggering the first terminal to send the first pilot signal group and the second pilot signal group, thereby It is helpful for the network device to perform beam tracking according to the first pilot signal group and the second pilot signal group, obtain more accurate beam information, and improve the communication performance between the network device and the first terminal. For another example, the network device may also send the first indication information to the first terminal after it has not received the signal sent by the first terminal for a certain period of time. For example, the duration can be 1 minute, 30 seconds, and so on. For another example, the network device may also send the first indication information to the first terminal when the packet loss rate or the bit error rate of the signal received from the first terminal exceeds a certain threshold.

It should be noted that the network device may carry the first indication information in a certain dynamic signaling (for example, downlink control information (DCI), or other physical layer signaling, etc.) and send it to the first terminal. In addition, the foregoing is only an example of triggering the network device to send the first indication information, and does not constitute a limitation to the embodiment of the present application. In the embodiment of the present application, the network device may also trigger the sending of the first indication information to the first terminal in other ways. .

As another example, the event that triggers the first terminal to send the first pilot signal group and the second pilot signal group to the network device may also be: the first terminal detects the packet loss rate or the bit error rate of the signal received from the network device Exceed a certain threshold. For example, the first terminal detects that the packet loss rate of the signal received from the network device in the fourth time unit is greater than or equal to the threshold A, and sends the first pilot signal group to the network device in the first time unit, and in the second time unit Send the second pilot signal group to the network device. It should be noted that the fourth time unit is before the first time unit and the second time unit.

As another example, the event that triggers the first terminal to send the first pilot signal group and the second pilot signal group to the network device may also be: the first terminal detects that the signal received power or intensity of the signal received from the network device is lower than A certain threshold. For example, the first terminal receives the second signal from the network device in the fifth time unit, and when the signal received power or intensity of the second signal is lower than the threshold B, sends the first pilot signal group to the network device in the first time unit , Sending the second pilot signal group to the network device in the second time unit. It should be noted that the fifth time unit is before the first time unit and the second time unit.

In addition, it should be noted that the first time unit and the second time unit may be discontinuous in time, and there is a time interval. The time interval between the first time unit and the second time unit may be predefined, or may be indicated to the first terminal by the network device through signaling. For example, the network device sends second indication information to the first terminal. The second indication information is used to indicate that the time interval between the first time unit and the second time unit is the first time interval.

For ease of introduction, the interval between the first time unit and the second time unit is referred to as the pilot interval below.

Specifically, the pilot interval may be understood as: the time interval between the first position of the first time unit and the second position of the second time unit. For example, the first position may be the start position of the first time unit, the end position of the first time unit, or the middle position of the first time unit. The second position may be the start position of the second time unit, the end position of the second time unit, or the middle position of the second time unit. For example, as shown in Figure 5, the start position of the first time unit is T11, the end position of the first time unit is T12, the middle position of the first time unit is T13, and the start position of the second time unit is T21 , The end position of the second time unit is T22, and the middle position of the second time unit is T23. For example, the pilot interval is the time interval between the start position of the first time unit and the start position of the second time unit. As shown in FIG. 5, the pilot interval is the time interval between T11 and T21. For another example, the pilot interval is the time interval between the end position of the first time unit and the start position of the second time unit. As shown in FIG. 5, the pilot interval is the time interval between T12 and T21. For another example, the pilot interval is the time interval between the start position of the first time unit and the end position of the second time unit. As shown in FIG. 5, the pilot interval is the time interval between T11 and T22.

It should be noted that the first position may also be the start position, or end position, or middle position of the Nth sub-time unit included in the first time unit. For the second position, please refer to the related introduction of the first position. No longer.

Wherein, the unit of the pilot interval may be a time unit, or a sub-time unit, and may also be milliseconds (ms), seconds (s), etc., which is not limited. For example, the pilot interval may be N1 subframes, or M1 time slots, or P1 symbols, or x1 milliseconds, or y1 seconds, etc., where N1, M1, P1, x1, and y1 are integers greater than or equal to zero. In some embodiments, the pilot interval is determined according to the moving speed of the first terminal. Among them, the greater the moving speed of the first terminal, the smaller the pilot interval. This helps to increase the possibility that the network device determines that the transmission beam of the first signal is aligned with the reception beam of the first terminal. For example, the network device may be configured with multiple pilot intervals, and different pilot intervals correspond to different moving speed ranges. For example, the network device configures pilot interval 1, pilot interval 2, and pilot interval 3 for the first terminal. The moving speed range corresponding to pilot interval 1 is moving speed range 1, the moving speed range corresponding to pilot interval 2 is moving speed range 2, and the moving speed range corresponding to pilot interval 3 is moving speed range 3. If the moving speed of the first terminal is in the moving speed range 2, the first terminal sends the first pilot signal group and the second pilot signal group to the network device according to the pilot interval 2. In addition, in some embodiments, the network device may also configure multiple pilot intervals by configuring multiple pilot patterns, or pilot locations, or pilot resources.

For example, the pilot interval may be determined by the first terminal according to its own moving speed, or may be determined by the network device according to the moving speed of the first terminal. Wherein, the moving speed of the first terminal may be determined by the network device according to the pilot signal or other signals sent by the first terminal, or may be reported by the first terminal, which is not limited.

The following further introduces the communication method of the embodiment of the present application in combination with scenarios of different signal receiving and sending modes.

Scenario 1: No beam scanning. That is, the first terminal sends pilot signals omnidirectionally, and the network equipment receives pilot signals omnidirectionally. In this case, each of the aforementioned pilot signal groups may include one pilot signal, that is, one pilot signal is carried on one time unit. signal.

That is, in a scenario without beam scanning, in a beam scanning process, the first terminal sends a pilot signal in two time units respectively. Take the i-th beam tracking process as an example. Among them, i is a positive integer greater than or equal to 1. In the i-th beam tracking process, the first terminal sends the pilot signal i1 to the network device in time unit i1, and sends the pilot signal i2 to the network device in time unit i2. Correspondingly, the network device receives the pilot signal i1 in time unit i1. The pilot signal i1 of a terminal receives the pilot signal i2 from the first terminal at the time unit i2. Then, the network device determines the transmission beam of the first signal according to the pilot signal i1 and the pilot signal i2. The determined sending beam of the first signal is the optimal beam direction for the network device to send the signal to the first terminal, so that the reliability of the first terminal receiving the first signal sent by the network device can be improved, and the communication performance can be improved. It should be noted that for the i-th beam tracking process, as an example, the time unit i1 can be understood as the first time unit shown in FIG. 4, and the time unit i2 can be understood as the second time unit shown in FIG.

For example, for a scene without beam scanning, in different beam tracking processes, the time interval between two time units carrying pilot signals may be the same or different. For example, as shown in Figure 6, in the m-th beam tracking process, the pilot signal is carried on the time unit m1 and time unit m2, respectively, and in the n-th beam tracking process, the pilot signal is carried on the time unit n1 and time unit n2, respectively. For the pilot signal, the time interval M between the time unit m1 and the time unit m2, and the time interval N between the time unit n1 and the time unit n2 may be the same or different. For example, in the case of a uniform movement of the first terminal, the time interval M and the time interval N are the same. For another example, when the acceleration of the first terminal is not 0, the time interval M and the time interval N are different.

It should also be noted that the position of the pilot signal carried by the time unit m1 and the time unit m2, the time unit n1 and the time unit n2 can be the same or different; the time unit m1 and the time unit n1, the time unit m2 and the time unit n2 carry The position of the pilot signal can be the same or different.

Scenario 2: Beam scanning of multiple receiving beams on the network device side. For example, the network device may include Y receiving beams, but use V receiving beams to receive the pilot signal in a directional direction. Among them, V is less than or equal to Y. For example, the V receiving beams are determined by the network device from the Y receiving beams according to a certain algorithm or strategy.

In this case, the first terminal may send V pilot signals to the network device in one time unit, that is, one pilot signal group includes V pilot signals. In turn, the network device can determine the optimal receiving beam from the V receiving beams according to the receiving conditions of the V pilot signals. The network device may determine the sending beam for sending the first signal to the first terminal according to the determined optimal receiving beam.

For example, the V pilot signals included in a pilot signal group may be the same or different. For example, if the V pilot signals are the same, the first terminal repeatedly sends V pilot signals to the network device at different moments in a time unit.

Wherein, V is the number of receiving beams used by the network device to directionally receive the pilot signal, which may be predefined or notified by the network device to the first terminal through signaling, which is not limited.

It should be noted that the receiving beam used by the network device to directionally receive the pilot signal may be an analog beam, a digital beam, or a hybrid beam (ie, a beam where an analog beam and a digital beam are mixed), which is not limited.

In some embodiments, for a network device, only one receiving beam can be used to receive a signal at a time. Therefore, the first terminal sends a group of pilot signals to the network device at different moments in a time unit. For example, the first time unit includes V sub-time units. The first terminal can send pilot signals to the network device on the V sub-time units. Correspondingly, the network device can use different receiving beams for the V time units. Pilot signal from the first terminal. Specifically, the use of the V sub-time units in the first time unit by the first terminal may be determined according to a certain algorithm or strategy, or may be instructed by the network device, or may be predefined, which is not limited.

In a beam tracking process, the network equipment usually uses the same receiving beam to receive the pilot signals in two time units that carry two sets of pilot signals. Take the i-th beam tracking process as an example. For example, in the i-th beam tracking process, on the time unit i1 and the time unit i2, the same receiving beam is usually used to receive the pilot signal. For example, the time unit i1 and the time unit i2 use the same receiving beam to receive the pilot signal sub-time units corresponding to each other. For the corresponding understanding here, please refer to the following description of the embodiment in FIG. 7. It should be noted that the time unit i1 is the time unit that carries a group of pilot signals in the i-th beam tracking process, which can be understood as the above-mentioned first time unit, and the time unit i2 is the time unit that carries another group in the i-th beam tracking process. The time unit of the pilot signal can be understood as the above-mentioned second time unit.

Take the example that the number of sub-time units included in the time unit i1 is the same as the number of sub-time units included in the time unit i2. For example, as shown in Fig. 7, the time unit i1 includes a sub-time unit i11, a sub-time unit i12, and a sub-time unit i13, and the time unit i2 includes a sub-time unit i21, a sub-time unit i22, and a sub-time unit i23. Among them, the sub-time unit i11 corresponds to the sub-time unit i21, the sub-time unit i12 corresponds to the sub-time unit i22, and the sub-time unit i13 corresponds to the sub-time unit i23. That is, the receiving beam used by the network device to receive the pilot signal in the sub-time unit i11 and the sub-time unit i21 is the same, and the receiving beam used to receive the pilot signal in the sub-time unit i12 and the sub-time unit i22 is the same. The receiving beams used by the time unit i13 and the sub-time unit i23 to receive the pilot signal are the same.

It should be noted that for the sub-time unit i11 and the sub-time unit i21, the position of the sub-time unit i11 relative to the time unit i1 and the position of the sub-time unit i21 relative to the time unit i2 can be the same or different. Yes, in addition, the duration of the sub-time unit 11 and the duration of the sub-time unit 21 may be the same or different.

In addition, in different beam tracking processes, the receiving beams used by the network devices may be the same or different. For example, as shown in FIG. 8, the network device uses the receiving beam 1, the receiving beam 2 and the receiving beam 3 in the m-th beam tracking process and the n-th beam tracking process. Take the m-th beam tracking process as an example. In the m-th beam tracking process, the time unit m1 includes sub-time units m11, m12, and m13, and the time unit m2 includes sub-time units m21, m22, and m23. Among them, the sub-time unit m11 corresponds to m21, and m12 corresponds to m22. m13 corresponds to m23, namely:

The first terminal sends the pilot signal to the network device in the sub-time unit m11. Correspondingly, the network device uses the receiving beam 1 in the sub-time unit m11 to receive the pilot signal from the first terminal; the first terminal sends the pilot signal to the network in the sub-time unit m12. The device sends a pilot signal. Correspondingly, the network device uses the receiving beam 2 to receive the pilot signal from the first terminal in the sub-time unit m12; the first terminal sends the pilot signal to the network device in the sub-time unit m13. Correspondingly, the network The device uses the receiving beam 3 to receive the pilot signal from the first terminal in the sub-time unit m13. The first terminal sends the pilot signal to the network device in the sub-time unit m21. Correspondingly, the network device uses the receiving beam 1 in the sub-time unit m21 to receive the pilot signal from the first terminal; the first terminal sends the pilot signal to the network in the sub-time unit m22. The device sends a pilot signal. Correspondingly, the network device uses the receiving beam 2 to receive the pilot signal from the first terminal in the sub-time unit m22; the first terminal sends the pilot signal to the network device in the sub-time unit m23. Correspondingly, the network The device uses the receiving beam 3 to receive the pilot signal from the first terminal in the sub-time unit n23.

The network device determines the pilot signal with the maximum signal received power or strength according to the pilot signals received in the sub-time unit m11, the sub-time unit m12, and the sub-time unit m13. The network device determines the pilot signal with the maximum signal received power or strength according to the pilot signals received in the sub-time unit m21, the sub-time unit m22, and the sub-time unit m23. Then, the network device determines the transmission beam of the first signal according to the pilot signal with the highest signal received power or strength in the time unit m2 and the pilot signal with the highest signal received power or strength in the time unit m1. It should be noted that the signal received power or the strongest pilot signal on the time unit m1, and the signal received power or the strongest pilot signal on the time unit m2 can be received by the network equipment using the same receiving beam, or can be received by different receivers. Received by the beam.

For the manner in which the network device determines the transmission beam of the first signal in the n-th beam tracking process, refer to the method for the network device to determine the transmission beam of the first signal in the m-th beam tracking process, which will not be repeated here.

Scenario 3: Beam scanning with multiple transmission beams on the terminal side. For example, the first terminal may include X transmit beams, but uses U transmit beams to transmit the pilot signal in a directional manner. Among them, U is less than or equal to X.

In this case, the first terminal may send U pilot signals to the network device in one time unit, that is, one pilot signal group includes U pilot signals. In turn, the network device can determine the optimal transmission beam from the U transmission beams according to the reception conditions of the U pilot signals, and then notify the first terminal of the determined optimal transmission beam. The network device may determine the sending beam for sending the first signal to the first terminal according to the determined optimal sending beam.

For example, U pilot signals included in a pilot signal group may be the same or different. For example, if U pilot signals are the same, the first terminal repeatedly sends U pilot signals to the network device at different times in a time unit.

Among them, U is the number of transmission beams used by the first terminal to send the pilot signal directionally, which may be predefined, or notified by the network device to the first terminal through signaling, or the first terminal according to The actual situation is determined based on a certain algorithm or rule, and there is no restriction on this.

It should be noted that the transmission beam used by the first terminal for directional transmission of the pilot signal may be an analog beam, a digital beam, or a hybrid beam (ie, a beam where the analog beam and the digital beam are mixed), which is not limited. .

In some embodiments, for the first terminal, only one transmission beam can be used to transmit a signal at a time. Therefore, the first terminal uses one transmission beam to send the pilot signal to the network device at different moments in the first time unit. For example, the first time unit includes U sub-time units, and the first terminal may respectively use one transmission beam on the U sub-time units to send the pilot signal to the network device. The network device may receive pilot signals from different transmission beams of the first terminal. Specifically, the use of the U sub-time units in the first time unit by the first terminal may be determined according to a certain algorithm or strategy, may also be instructed by the network device, or may be predefined, which is not limited.

In a beam tracking process, the first terminal usually uses the same transmit beam to receive the pilot signal in a time unit that carries two sets of pilot signals. Take the i-th beam tracking process as an example. For example, in the i-th beam tracking process, on the time unit i1 and the time unit i2, the same transmitting beam is usually used to transmit the pilot signal. For example, the time unit i1 and the time unit i2 use the same transmission beam to send the pilot signal sub-time units corresponding to each other. For the corresponding understanding here, reference can also be made to the following description of the embodiment in FIG. 7. It should be noted that the time unit i1 is the time unit that carries a group of pilot signals in the i-th beam tracking process, which can be understood as the above-mentioned first time unit, and the time unit i2 is the time unit that carries another group in the i-th beam tracking process. The time unit of the pilot signal can be understood as the above-mentioned second time unit.

Take the example that the number of sub-time units included in the time unit i1 is the same as the number of sub-time units included in the time unit i2. For example, as shown in FIG. 7, the sub-time unit i11 corresponds to the sub-time unit i21, the sub-time unit i12 corresponds to the sub-time unit i22, and the sub-time unit i13 corresponds to the sub-time unit i23. That is, the first terminal uses the same transmission beam to transmit the pilot signal in the sub-time unit i11 and the sub-time unit i21, and uses the same transmission beam to transmit the pilot signal in the sub-time unit i12 and the sub-time unit i22. The transmission beams used by the sub-time unit i13 and the sub-time unit i23 to transmit the pilot signal are the same.

In addition, in different beam tracking processes, the transmitting beams used by the first terminal may be the same or different. For example, as shown in FIG. 9, the first terminal uses transmit beam 1, transmit beam 2 and transmit beam 3 in the m-th beam tracking process and the n-th beam tracking process. Take the m-th beam tracking process as an example. In the m-th beam tracking process, the time unit m1 includes sub-time units m11, m12, and m13, and the time unit m2 includes sub-time units m21, m22, and m23. Among them, the sub-time unit m11 corresponds to m21, and m12 corresponds to m22. m13 corresponds to m23. For example, the first terminal uses transmit beam 1 to send the pilot signal in the sub-time unit m11. Correspondingly, the network device receives the pilot signal from the first terminal in the sub-time unit m11; the first terminal is in the sub-time unit m11. The unit m12 uses the transmit beam 2 to send the pilot signal. Correspondingly, the network device receives the pilot signal from the first terminal in the sub-time unit m12; the first terminal uses the transmit beam 3 to send the pilot signal in the sub-time unit m13. , The network device receives the pilot signal from the first terminal in the sub-time unit m13. The first terminal uses the transmit beam 1 to transmit the pilot signal in the sub-time unit m21. Correspondingly, the network device receives the pilot signal from the first terminal in the sub-time unit m21; the first terminal uses the transmit beam 2 to transmit in the sub-time unit m22. The pilot signal. Correspondingly, the network device receives the pilot signal from the first terminal in the sub-time unit m22; the first terminal uses the transmit beam 3 to send the pilot signal in the sub-time unit m23. Correspondingly, the network device is in the sub-time unit. m23 receives the pilot signal from the first terminal.

The network device determines the pilot signal with the maximum signal received power or strength according to the pilot signals received in the sub-time unit m11, the sub-time unit m12, and the sub-time unit m13. The network device determines the pilot signal with the maximum signal received power or strength according to the pilot signals received in the sub-time unit m21, the sub-time unit m22, and the sub-time unit m23. The transmission beam of the first signal is determined according to the pilot signal with the highest signal received power or strength in the time unit m2 and the pilot signal with the highest signal received power or strength in the time unit m2. It should be noted that the signal received power or the strongest pilot signal on the time unit m1, and the signal received power or the strongest pilot signal on the time unit m1 may be transmitted by the first terminal using the same transmitting beam, or different Send beam sent.

Scenario 4: Beam scanning with multiple receiving beams on the network device side and multiple transmitting beams on the terminal side. For example, the first terminal may include X transmit beams, and the network device may include Y receive beams. However, the first terminal uses U transmit beam orientations to send pilot signals to the network device, and the network device uses V receive beams to receive signals from the first terminal. Pilot signal of a terminal. U is less than or equal to X, and V is less than or equal to Y.

When the first terminal can only use one transmit beam to send a signal to the network device at a time, and the network device can only use one receive beam to receive a signal at a time, for a pilot signal, it corresponds to one transmission of the first terminal. A combination of a beam and a receiving beam of the network device, that is, one pilot signal corresponds to a beam combination, and the beam combination includes a transmitting beam of the first terminal and a receiving beam of the network device. In the case that the first terminal uses U transmit beam orientations to send pilot signals to the network device, and the network device uses V receive beams to receive the pilot signal from the first terminal, the transmit beam of the first terminal and the receive beam of the network device exist U×V beam combinations. The number of pilot signals that the first terminal can send to the network device in a time unit is related to the number of beam combinations used. For example, if the first terminal uses the transmission beams corresponding to the Z beam combinations in the U×V beam combinations to send pilot signals, the number of pilot signals that can be sent to the network device in one time unit is Z.

Wherein, the number of beam combinations may be predefined, or may be indicated to the first terminal by the network device through signaling, which is not limited. For example, in a beam tracking process, the first terminal uses which beam combination of U×V beam combinations to send the pilot signal, which can be determined by the first terminal according to a certain algorithm or strategy, or it can be a network Instructed by the device to the terminal. It should be noted that, in a beam tracking process, the beam combinations generally used for the two time units carrying the pilot signal group are the same. Taking the i-th beam tracking process as an example, the same beam combination is usually used in the time unit i1 and the time unit i2. Among them, the time unit i1 is a time unit that carries a group of pilot signals, and the time unit i2 is a time unit that carries another group of pilot signals. For example, in a beam tracking process, the time unit i1 and the time unit i2 use the same beam combination sub-time units corresponding to each other. With regard to the corresponding understanding here, it is similar to the description of the embodiment of FIG. 7 in the

above scenario

2 or 3. For different beam tracking processes, the beam combinations used by the two time units carrying the pilot signal group may be different or the same.

For example, as shown in Figure 10, the first terminal uses transmit beam 1, transmit beam 2 and transmit beam 3 to directionally send pilot signals, and the network device uses receive beam 1, receive beam 2, and receive beam 3 to directionally receive pilot signals. . In this case, there are 9 beam combinations for the transmitting beam of the first terminal and the receiving beam of the network device, which are beam combination 1 to beam combination 9. Among them, beam combination 1 includes transmitting beam 1 and receiving beam 1, beam combination 2 includes transmitting beam 2 and receiving beam 2, beam combination 3 includes transmitting beam 3 and receiving beam 3, and beam combination 4 includes transmitting beam 1 and receiving beam 2. Beam combination 5 includes transmit beam 2 and transmit beam 3, beam combination 6 includes transmit beam 1 and receive beam 3, beam combination 7 includes transmit beam 2 and receive beam 1, beam combination 8 includes transmit beam 3 and receive beam 1, beam combination 9 includes transmitting beam 3 and receiving beam 2.

For example, in the m-th beam tracking process, the beam combinations used on the sub-time units of the time unit m1 and the time unit m2 are beam combination 1, beam combination 2 and beam combination 3, and in the nth beam tracking process , The beam combinations used on the sub-time units of the time unit n1 and the time unit n2 are beam combination 3, beam combination 4, and beam combination 5, respectively. It should be noted that in the nth beam tracking process, the beam combinations used in the sub-time units of the time unit n1 and the time unit n2 can also be beam combination 1, beam combination 2, and beam combination 3, respectively. The beam combination used in the secondary beam tracking process is the same.

Take the m-th beam tracking process as an example. As shown in Figure 10, the time unit m1 includes sub-time units m11, m12, and m13, and the time unit m2 includes sub-time units m21, m22, and m23. Among them, the sub-time unit m11 corresponds to m21, m12 corresponds to m22, and m13 corresponds to m23. Correspondingly, for example, the first terminal uses the transmit beam 1 in the sub-time unit m11 to send the pilot signal to the network device, and correspondingly, the network device uses the receive beam 1 in the sub-time unit m11 to receive the pilot signal from the first terminal; The terminal uses the transmit beam 2 to send the pilot signal to the network device in the sub-time unit m12. Correspondingly, the network device uses the receive beam 2 in the sub-time unit m12 to receive the pilot signal from the first terminal; the first terminal uses the sub-time unit m13 The transmitting beam 3 is used to send the pilot signal to the network device. Correspondingly, the network device uses the receiving beam 3 in the sub-time unit m13 to receive the pilot signal from the first terminal. The first terminal uses the transmit beam 1 in the sub-time unit m21 to send the pilot signal. Correspondingly, the network device uses the receive beam 1 in the sub-time unit m21 to receive the pilot signal from the first terminal; the first terminal uses the sub-time unit m22 The transmitting beam 2 sends the pilot signal. Correspondingly, the network device uses the receiving beam 2 to receive the pilot signal from the first terminal in the sub-time unit m22; the first terminal uses the transmitting beam 3 to send the pilot signal in the sub-time unit m23, corresponding to Yes, the network device uses the receiving beam 3 in the sub-time unit m23 to receive the pilot signal from the first terminal. Then, the network device can determine the pilot signal with the highest signal reception strength or power from the pilot signals received by the sub-time unit m11, the sub-time unit m12, and the sub-time unit m13, and from the sub-time unit m21 and the sub-time unit m22 Among the pilot signals received by the sub-time unit m23, the pilot signal with the largest signal reception strength or power is determined. Then, the transmission beam of the first signal is determined according to the pilot signal with the highest signal reception strength or power received in the time unit m1 and the time unit m2, respectively. It should be noted that the beam combination used by the signal received power or the strongest pilot signal on the time unit m1 and the beam combination used by the signal received power or the strongest pilot signal on the time unit m2 may be the same or different.

It should be noted that, in the foregoing scenario 1 to scenario 4, a beam tracking process involved includes the first terminal separately sending a group of pilot signals in two time units.

In addition, in the LOS scenario, the wireless signal can travel in a straight line between the terminal and the network device without obstruction. When different terminals in the LOS environment send signals at the same time, it is easy to cause mutual interference between the signals. For example, as shown in Figure 11, terminal 1 sends a signal to network device 1, and terminal 2 sends a signal to network device 2. Since terminal 1 and terminal 2 send signals at the same time, if network device 1 receives a signal from terminal 2, If the signal sent by terminal 1 is not orthogonal to the signal sent by terminal 2, the signal from terminal 2 will interfere with the network device 1 receiving the signal from terminal 1. Correspondingly, if the network device 2 receives the signal from The signal from the terminal 1 and the signal from the terminal 1 will interfere with the reception of the signal from the terminal 2 by the network device 2. In view of this, the embodiment of the present application also provides a method for interference cancellation, which can make the network device perform interference cancellation based on the LOS path and improve communication performance.

As an example, as shown in FIG. 12, an interference cancellation method according to an embodiment of this application specifically includes the following steps.

Step 1201: The network device receives the first signal in time unit 1. The first signal includes a first signal component and a second signal component.

Step 1202: When the LOS path 1 is different from the LOS path 2, the network device eliminates the second signal component.

Among them, the arrival angle of the LOS path 1 is the arrival angle 1. The angle of arrival 1 is the angle of arrival between the time unit 2, the network device and the first terminal. LOS path 2 is the LOS path of the second signal component. The LOS path of the first signal component is LOS path 1.

For example, the angle of arrival 1 is determined by the network device according to the second signal sent by the first terminal. For the specific manner of determining the angle of arrival based on the signal, refer to the foregoing implementation manner of determining the angle of arrival based on the pilot signal, which will not be repeated here.

Specifically, the first signal component can be understood as a useful signal component. This is because for network equipment, the first signal component is a signal sent from the first terminal in time unit 1, which is a useful signal, and the second signal component can be It is understood as an interference signal component, because for the network device, the second signal component is a signal sent from the second terminal in time unit 1, which is an interference signal. Wherein, the second terminal and the first terminal are different terminals. The second signal can be understood as a useful signal. For the network device, the second signal is a signal sent from the first terminal in the time unit 2.

It can be understood that the network device receives the first signal in time unit 1 and receives the second signal in time unit 2. For example, the first signal includes a first pilot signal from the first terminal, and the second signal includes a second pilot signal from the first terminal. For the network device, if the pilot signal sent by the first terminal is a useful signal, then in the case that the first signal is an interfered signal and the second signal is a non-interfered signal, the network device can use the second signal Determine the arrival angle 1 and the LOS path 1 between the first terminal and the network device, and then identify the interference signal in the first signal according to the determined arrival angle 1 and the LOS path 1, so as to eliminate the interference signal. It should be noted that the interfered signal refers to a signal including an interference signal component in the signal.

In the embodiment of this application, since the first pilot signal sent by the first terminal in time unit 1 and the second pilot signal sent in time unit 2 may be determined by itself or instructed by a network device, The pilot sequences of the pilot signals sent on different time units have a relatively low probability of conflicting with the pilot signals sent by other terminals, so the network equipment can be based on receiving undisturbed pilot signals on time unit 1 and time unit 2. , Determine the angle of arrival and the LOS path between the first terminal and the network device, and then identify the interference signal in the received interfered pilot signal, thereby eliminating the interference signal.

For example, the first terminal receives the third indication information of the network device, and the third indication information is used to instruct the first terminal to send the first pilot signal and the second pilot signal to the network device. For example, the first terminal sends the first pilot signal in time unit 1 and the second pilot signal in time unit 2 according to the third instruction information.

In some embodiments, the network device can detect whether the received signal is an interfered signal through a spatially matched filter. For example, if the signal includes signal components from two or more LOS paths, the signal is the interfered signal. If the signal only includes signal components from one LOS path, the signal is an undisturbed signal.

For example, the network device may detect whether the signal includes multiple signal components whose arrival angles satisfy the first condition through a spatial filter, and use the signal components whose arrival angles satisfy the first condition as the signal component from the LOS path 1. The first condition may be predefined, or determined by the network device according to a certain algorithm or rule. For example, network devices are determined through machine learning. For example, a signal component whose arrival angle satisfies the first condition may mean that the arrival angle is within the first arrival angle range, or not within the second arrival angle range, or the arrival angle is greater than or equal to a certain threshold. It should be noted that the angle of arrival that satisfies the first condition may be referred to as the angle of arrival between the air terminal and the network device, or the angle of arrival of the air terminal for short. For example, the angle of arrival that does not meet the first condition may be referred to as the angle of arrival between the ground terminal and the network device, referred to as the angle of arrival of the ground terminal.

For example, the arrival angles of the signal components _{p, q} included in the signal include a horizontal angle φ _p and a vertical angle θ _q , where the horizontal angle φ _p indicates the horizontal angle between the terminal sending the signal component _{p, q} and the network device , The vertical angle θ _q indicates the angle in the vertical direction between the terminal sending the signal components _{p, q and the network device.}

Among them, the horizontal angle φ _p satisfies expression 6, and the vertical angle θ _{q is} full expression 7:

The signal received power T _{p, q of the} signal components _p, q satisfies expression 8:

Is the precoding matrix, and

a(φ,θ) is the steering vector, L _φ is the number of horizontal antennas, L _θ is the number of vertical antennas,

Represents the channel estimated from the signal.

For a certain signal, if there are multiple arrival angles (φ _p , θ _q ) that satisfy the first condition, and the signal received power T _{p, q} corresponding to these multiple arrival angles is not 0, it is determined that the signal is Interfering signals include both interference signal components and useful signal components.

For example, for a certain signal, if there are one or more arrival angles (φ _p , θ _q ) satisfying the first condition, and corresponding to only one of the multiple arrival angles, the signal received power T _p,q If it is not 0, it is determined that the signal is not interfered with. The signal component whose signal received power T _{p,q is} not 0 and whose angle of arrival satisfies the first condition is the useful signal component, and the transmission path of the useful signal component is the LOS path. Taking the second signal as an example, the LOS path of the useful signal component is LOS path 1.

Taking the first signal as an example, from the signal components of the multiple arrival angles that satisfy the first condition, determine the arrival angle whose difference with the arrival angle 1 is less than or equal to a certain threshold, or the angle that is the same as the arrival angle 1. For the signal component of the angle of arrival, use the angle of arrival as the first signal component with the LOS path being LOS path 1.

As another example, the signal transmitted on the channel satisfying Expression 9 in the first signal is taken as the signal component whose LOS path is LOS path 1, that is, the first signal component.

Among them, A=[a(φ ₀ ,θ ₀ ),a(φ ₁ ,θ ₁ ),...,a(φ _Lφ-1 ,θ _Lθ-1 )].

For example, in order to make the LOS path of the signal sent by the first terminal to the network device in the time unit 1 and the time unit 2 basically remain unchanged or remain unchanged, in some embodiments, the time unit 1 and the time unit 2 are time-based Two consecutive time units. For example, as shown in FIG. 12, time unit 1 and time unit 2 are two consecutive time units in time. In other embodiments, the time interval between time unit 1 and time unit 2 is less than the coherence time of the channel. Alternatively, the time interval between the time unit 1 and the time unit 2 may satisfy: the arrival angle 2 and the arrival angle 1 are the same, or the difference between the arrival angle 2 and the arrival angle 1 is less than or equal to the threshold value 0. Wherein, the angle of arrival 1 is the angle of arrival between the time unit 2, the first terminal and the network device, and the angle of arrival 2 is the angle of arrival between the time unit 1, the first terminal and the network device. Among them, the angle of arrival 1 is the angle of arrival of the second signal from the first terminal received by the network device in time unit 2, and the angle of arrival 2 is the signal from the first terminal received by the network device in time unit 1 (that is, the first The angle of arrival of the signal component). Wherein, the threshold 0 may be predefined or determined according to a certain algorithm or rule, which is not limited.

It should be noted that, the time interval between the time unit 1 and the time unit 2 can refer to the above-mentioned related introduction of the time interval between the first time unit and the second time unit, which will not be repeated here. Specifically, the time interval between time unit 1 and time unit 2 may be predefined, or the time interval is notified to the first terminal by the network device through signaling, or determined by the network device according to the moving speed of the first terminal The embodiment of the present application does not limit the manner of determining the time interval between the time unit 1 and the time unit 2.

Further, in some embodiments, the signal reception intensity or power of the second signal component is greater than or equal to the threshold value 1, that is, when the signal reception intensity or power of the second signal component is greater than or equal to the threshold value 1, the second signal is eliminated Weight. Wherein, the threshold value 1 may be predefined or determined according to a certain algorithm or rule, which is not limited. That is to say, for interference signal components with low signal reception strength or power, the interference to useful signal components is small or negligible. Therefore, interference cancellation may not be performed, which helps simplify the implementation. For interference signal components with greater signal reception strength or power, the interference to the useful signal components is greater, so interference cancellation is required.

For example, threshold 1 (threshold1) satisfies expression 10:

threhold1=K·Σ _p,q T _p,q expression 10

Among them, K is a constant, which may be predefined or determined according to a certain algorithm or strategy. There is no restriction on this. T _{p, q} satisfy Expression 8.

It should be noted that the time unit 1 and the time unit 2 in the embodiment of the present application may be understood as the sub-time unit in the foregoing embodiment, or may be a time unit.

Taking the first time unit including the first sub-time unit and the second sub-time unit as an example, the network device receives the first pilot signal from the first terminal in the first sub-time unit, and receives the first pilot signal from the first terminal in the second sub-time unit. The second pilot signal of the terminal. If the network device also receives the third signal from the second terminal in the first sub-time unit, the signal received by the network device in the first sub-time unit includes the first signal from the first terminal. The pilot signal, and the third signal from the second terminal. The signal received by the network device in the second sub-time unit only includes the second pilot signal from the first terminal. The first pilot signal and the third signal are signal components of signals received by the network device in the first sub-time unit, the first pilot signal is a useful signal component, and the third signal is an interference signal component. Among them, the LOS path of the first pilot signal is LOS path 1, and the angle of arrival of LOS path 1 is angle of arrival 1, which is the same as the angle of arrival between the second sub-time unit, the first terminal and the network device . The LOS path of the third signal is LOS path 2, and LOS path 2 is different from LOS path 1. Therefore, the network equipment can eliminate the third signal according to the angle of arrival 1, thereby avoiding the interference of the third signal to the first pilot signal. Help improve channel estimation. For example, the third signal may be a pilot signal, where the pilot sequence of the third pilot signal is the same as the pilot sequence of the first pilot signal.

In addition, the transmission of wireless signals in the LOS scenario may also cause interference to the signal transmission in the non-LOS scenario, thereby affecting the communication of the terminal (for example, a ground terminal) in the non-LOS scenario. For example, as shown in Figure 13, in a LOS scenario, terminal 1 sends a signal to network device 1, and in a non-LOS scenario, terminal 2 sends a signal to network device 2. When terminal 1 and terminal 2 send signals at the same time, network device 2 If the signal from the terminal 1 is received, the signal from the terminal 1 will cause interference to the network device 2 receiving the signal from the terminal 2. In the LOS scenario, wireless signals can travel in a straight line between the terminal and the network device without obstruction. Therefore, the signal from the terminal 1 will cause serious interference to the network device 2 receiving the signal from the terminal 2. In view of this, the present application The embodiment also provides a method for interference cancellation, which can make the network device perform interference cancellation based on the angle of arrival and improve communication performance.

As an example, as shown in FIG. 14, another interference cancellation method provided in an embodiment of this application specifically includes the following steps.

Step 1401: The network device receives a signal in time unit 1, and the signal includes a first signal component and a second signal component.

Step 1402: When the angle of arrival of the second signal component meets the second condition, cancel the second signal component.

It should be noted that the second condition may be predefined, or determined by the network device according to a predefined algorithm or policy, which is not limited. For example, if the angle of arrival of the second signal component satisfies the second condition, reference may be made to the related introduction of the signal component whose angle of arrival satisfies the first condition in FIG. 11, which is not repeated here.

For example, the network device may detect whether the signal includes multiple signal components whose arrival angles meet the second condition through a spatial filter, and use the signal components whose arrival angles meet the second condition as the signal component from the LOS path. The second condition can be predefined, or determined by the network device according to a certain algorithm or rule. For example, network devices are determined through machine learning.

For example, the signal component whose arrival angle meets the second condition may mean that the arrival angle is within the third arrival angle range, or not within the fourth arrival angle range, or the arrival angle is greater than or equal to a certain threshold. It should be noted that the angle of arrival that satisfies the second condition may be referred to as the angle of arrival between the air terminal and the network device, or the angle of arrival of the air terminal for short. For example, the angle of arrival that does not meet the second condition may be referred to as the angle of arrival between the ground terminal and the network device, referred to as the angle of arrival of the ground terminal.

For example, in this embodiment of the present application, after the time unit 1 receives the signal, the network device detects the signal component in the signal. For example, the network device may detect signal components included in the signal through a spatially matched filter. For example, a signal component whose angle of arrival meets the second condition is taken as the second signal component, and a signal component whose angle of arrival does not satisfy the second condition is taken as the first signal component.

For example, the network device may determine the signal component included in the received signal, and the angle of arrival and signal reception power corresponding to the signal component based on Expression 6 and Expression 7, and Expression 8.

Further, in some embodiments, the signal received power of the second signal component is greater than or equal to the threshold 2. For example, the threshold 2 may refer to the specific implementation of the threshold 1, which will not be repeated here. Wherein, the threshold 2 may be predefined, or determined according to a certain algorithm or rule, which is not limited. That is to say, for interference signal components with low signal reception strength or power, the interference to useful signal components is small or negligible. Therefore, interference cancellation may not be performed, which helps simplify the implementation. For interference signal components with greater signal reception strength or power, the interference to the useful signal components is greater, so interference cancellation is required.

The threshold in the embodiment of the present application may also be referred to as a threshold, which is not limited.

The foregoing embodiments can be used independently or in combination with each other to achieve different technical effects.

In the above-mentioned embodiments provided in the present application, the communication method provided in the embodiments of the present application is introduced from the perspective of a terminal device as an execution subject. In order to realize each function in the communication method provided in the above embodiments of the present application, the terminal device may include a hardware structure and/or a software module, and realize the above functions in the form of a hardware structure, a software module, or a hardware structure plus a software module. Whether a certain function of the above-mentioned functions is executed by a hardware structure, a software module, or a hardware structure plus a software module depends on the specific application and design constraint conditions of the technical solution.

Similar to the above-mentioned concept, as shown in FIG. 15, an embodiment of the present application further provides an apparatus 1500. The apparatus 1500 includes a transceiver module 1502 and a processing module 1501.

In an example, the apparatus 1500 is used to implement the function of the terminal in the foregoing method. The device 1500 may be a network device or a device in a network device. Among them, the device may be a chip system. In the embodiments of the present application, the chip system may be composed of chips, or may include chips and other discrete devices.

For example, the processing module 1501 may be used to determine the transmission beam of the first signal. The transceiver module 1502 is configured to receive the first pilot signal group from the first terminal in the first time unit, and receive the second pilot signal group from the first terminal in the second time unit, or send the first pilot signal group to the first terminal. signal.

In an example, the apparatus 1500 is used to implement the function of the terminal device in the foregoing method. The apparatus 1500 may be a terminal device or a device in a terminal device. Among them, the device may be a chip system. In the embodiments of the present application, the chip system may be composed of chips, or may include chips and other discrete devices.

The transceiver module 1502 is configured to send a first pilot signal group to the network device in a first time unit, send a second pilot signal group to the network device in a second time unit, and receive the first signal from the network device. The processing module 1501 is used to trigger the transceiver module 1502 to send the first pilot signal group and the second pilot signal group.

For the specific execution process of the processing module 1501 and the transceiver module 1502, please refer to the record in the above method embodiment. The division of modules in the embodiments of this application is illustrative, and it is only a logical function division. In actual implementation, there may be other division methods. In addition, the functional modules in the various embodiments of this application can be integrated into one process. In the device, it can also exist alone physically, or two or more modules can be integrated into one module. The above-mentioned integrated modules can be implemented in the form of hardware or software function modules.

Similar to the above-mentioned concept, as shown in FIG. 16, an embodiment of the present application further provides an apparatus 1600.

In an example, the apparatus 1600 is used to implement the function of the terminal in the foregoing method, and the apparatus 1600 may be a network device or a device in the network device. The apparatus 1600 includes at least one processor 1601, configured to implement the function of the network device in the foregoing method. For example, the processor 1601 may be used to determine the transmission beam of the first signal.

In some embodiments, the apparatus 1600 may further include at least one memory 1602 for storing program instructions and/or data. The memory 1602 is coupled with the processor 1601. The coupling in the embodiments of the present application is an interval coupling or a communication connection between devices, units or modules, which can be electrical, mechanical or other forms, and is used for information exchange between devices, units or modules. As another implementation, the memory 1602 may also be located outside the apparatus 1600. The processor 1601 may cooperate with the memory 1602 to operate. The processor 1601 may execute program instructions stored in the memory 1602. At least one of the at least one memory may be included in the processor.

In some embodiments, the apparatus 1600 may further include a communication interface 1603 for communicating with other devices through a transmission medium, so that the apparatus used in the apparatus 1600 can communicate with other devices. Exemplarily, the communication interface 1603 may be a transceiver, circuit, bus, module, or other type of communication interface, and the other device may be a network device. The processor 1601 uses the communication interface 1603 to send and receive data, and is used to implement the method in the foregoing embodiment. Exemplarily, the communication interface 1603 is used to receive the first pilot signal group and the second pilot signal group, or send the first signal.

In an example, the device 1600 is used to implement the functions of the terminal in the foregoing method, and the device 1600 may be a terminal or a device in the terminal. The apparatus 1600 has at least one processor 1601, configured to implement the function of the first terminal in the foregoing method. For example, the processor 1601 may be used to trigger the sending of the first pilot signal group and the second pilot signal group. For details, refer to the detailed description in the method, which will not be described here.

In some embodiments, the apparatus 1600 may further include a communication interface 1603 for communicating with other devices through a transmission medium, so that the apparatus used in the apparatus 1600 can communicate with other devices. Exemplarily, the communication interface 1603 may be a transceiver, a circuit, a bus, a module, or another type of communication interface, and the other device may be a terminal. The processor 1601 uses the communication interface 1603 to send and receive data, and is used to implement the method in the foregoing embodiment. Exemplarily, the communication interface 1603 can send the first pilot signal group and the second pilot signal group, or receive the first signal.

In the embodiment of the present application, the connection medium between the communication interface 1603, the processor 1601, and the memory 1602 is not limited. For example, in the embodiment of the present application in FIG. 16, the memory 1602, the processor 1601, and the communication interface 1603 may be connected by a bus, and the bus may be divided into an address bus, a data bus, and a control bus.

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

In the embodiment of the present application, the memory may be a non-volatile memory, such as a hard disk drive (HDD) or a solid-state drive (SSD), etc., or a volatile memory (volatile memory), for example Random-access memory (RAM). The memory is any other medium that can be used to carry or store desired program codes in the form of instructions or data structures and that can be accessed by a computer, but is not limited to this. The memory in the embodiments of the present application may also be a circuit or any other device capable of realizing a storage function for storing program instructions and/or data.

The methods provided in the embodiments of the present application may be implemented in whole or in part by software, hardware, firmware, or any combination thereof. When implemented by software, it can be implemented in the form of a computer program product in whole or in part. The computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on the computer, the processes or functions described in the embodiments of the present invention are generated in whole or in part. The computer may be a general-purpose computer, a special-purpose computer, a computer network, network equipment, user equipment, or other programmable devices. The computer instructions may be stored in a computer-readable storage medium, or transmitted from one computer-readable storage medium to another computer-readable storage medium. For example, the computer instructions may be transmitted from a website, computer, server, or data center. Transmission to another website, computer, server or data center via wired (such as coaxial cable, optical fiber, digital subscriber line (DSL)) or wireless (such as infrared, wireless, microwave, etc.). The computer-readable storage medium may be any available medium that can be accessed by a computer or a data storage device such as a server or a data center integrated with one or more available media. The usable medium may be a magnetic medium (for example, a floppy disk, a hard disk, and a magnetic tape), an optical medium (for example, a digital video disc (digital video disc, DVD for short)), or a semiconductor medium (for example, SSD).

Obviously, those skilled in the art can make various changes and modifications to the application without departing from the scope of the application. In this way, if these modifications and variations of this application fall within the scope of the claims of this application and their equivalent technologies, this application is also intended to include these modifications and variations.

Claims

A communication method, characterized in that the method includes:

A first pilot signal group from a first terminal is received in a first time unit, and a second pilot signal group from the first terminal is received in a second time unit; the first time unit and the second The time unit is different;

A first signal is sent to the first terminal, and a transmission beam of the first signal is determined according to the first pilot signal group and the second pilot signal group.
The method of claim 1, wherein the method further comprises:

Sending first indication information to the first terminal, where the first indication information is used to instruct the first terminal to send the first pilot signal group and the second pilot signal group.
The method according to claim 1 or 2, wherein the transmission beam of the first signal is determined according to the first pilot signal group and the second pilot signal group, and comprises:

The transmission beam of the first signal is determined according to a first angle of arrival and a second angle of arrival, the first angle of arrival is determined according to the first pilot signal group, and the second angle of arrival is determined according to the second angle of arrival. Pilot signal group determination;

Wherein, the first angle of arrival is the angle of arrival between the first terminal and the network device in the first time unit; the second angle of arrival is the angle of arrival between the first terminal and the network device in the second time unit, The angle of arrival between the terminal and the network device.
The method according to any one of claims 1 to 3, wherein the first time unit includes a first sub-time unit and a second sub-time unit, and the first pilot signal group includes a first pilot signal And the second pilot signal;

The receiving the first pilot signal group from the first terminal in the first time unit includes:

The first pilot signal from the first terminal is received in the first sub-time unit, and the second pilot signal from the first terminal is received in the second sub-time unit.
The method of claim 4, wherein the line-of-sight LOS diameter of the first pilot signal is the first LOS diameter; the angle of arrival of the first LOS path is the third angle of arrival; the third angle of arrival Angle is the angle of arrival between the first terminal and the network device in the second sub-time unit;

The method also includes:

The second signal from the second terminal is received in the first sub-time unit; the LOS path of the second signal is the second LOS path; when the second LOS path is different from the first LOS path, all the signals are cancelled. Mentioned second signal.
The method according to claim 5, wherein the signal reception strength of the second signal is greater than or equal to a second threshold.
The method according to claim 5 or 6, wherein the second sub-time unit and the first sub-time unit are two consecutive sub-time units in time; or,

The time interval between the second sub-time unit and the first sub-time unit is less than the coherence time of the channel; or,

The fourth angle of arrival is the same as the third angle of arrival; or,

The difference between the fourth angle of arrival and the third angle of arrival is less than or equal to the third threshold;

Wherein, the fourth angle of arrival is the angle of arrival between the first terminal and the network device in the first sub-time unit.
The method according to any one of claims 4 to 7, wherein the receiving the first pilot signal from the first terminal in the first sub-time unit comprises:

Receiving the first pilot signal from the first terminal through a first receiving beam in the first sub-time unit;

The receiving the second pilot signal from the first terminal in the second sub-time unit includes:

Receiving the second pilot signal from the first terminal through a second receiving beam in the second sub-time unit.
The method according to any one of claims 1 to 3, wherein the first pilot signal group includes a third pilot signal, and the second pilot signal group includes a fourth pilot signal.
A communication method, characterized in that the method includes:

Sending a first pilot signal group to the network device in a first time unit, and sending a second pilot signal group to the network device in a second time unit; the first time unit is different from the second time unit;

Receiving a first signal sent from the network device, and a transmission beam of the first signal is determined according to the first pilot signal group and the second pilot signal group.
The method of claim 10, wherein the method further comprises:

Receiving first indication information from the network device, where the first indication information is used to instruct the terminal to send the first pilot signal group and the second pilot signal group.
The method of claim 10, wherein the method further comprises:

After the third time unit sends the pilot signal to the network device, start a timer to start timing;

Detecting that the pilot signal is not sent to the network device before the timer expires;

The sending a first pilot signal group to the network device in a first time unit and sending a second pilot signal group to the network device in a second time unit includes:

When the timer expires, the first pilot signal group is sent to the network device in the first time unit, and the second pilot signal group is sent to the network device in the second time unit. Frequency signal group.
The method according to any one of claims 10 to 12, wherein the first time unit includes a first sub-time unit and a second sub-time unit, and the first pilot signal group includes a first pilot signal And the second pilot signal;

The first pilot signal group sent to the network device in the first time unit includes:

The first pilot signal is sent to the network device in the first sub-time unit, and the second pilot signal is sent to the network device in the second sub-time unit.
The method according to claim 13, wherein the sending the first pilot signal to the network device in the first sub-time unit comprises:

Sending the first pilot signal to the network device through a first sending beam in the first sub-time unit;

The sending the second pilot signal to the network device in the second sub-time unit includes:

Sending the second pilot signal to the network device through a second sending beam in the second sub-time unit.
The method according to any one of claims 10 to 12, wherein the first pilot signal group includes a third pilot signal; and the second pilot signal group includes a fourth pilot signal.
A communication device, characterized by being used to implement the method according to any one of claims 1 to 9, or for implementing the method according to any one of claims 10 to 15.
A communication device, comprising a processor and a memory, the memory stores instructions, and when the processor executes the instructions, the device executes the method according to any one of claims 1 to 9 .
A communication device, comprising a processor and a memory, the memory stores instructions, and when the processor executes the instructions, the device executes the method according to any one of claims 10 to 15 .
A computer-readable storage medium, characterized in that the computer-readable storage medium stores instructions, which when run on a computer, cause the computer to execute any one of claims 1 to 9, or 10 to 15 The method described.