CN114642017A - Communication method and device - Google Patents

Communication method and device Download PDF

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Publication number
CN114642017A
CN114642017A CN201980102034.2A CN201980102034A CN114642017A CN 114642017 A CN114642017 A CN 114642017A CN 201980102034 A CN201980102034 A CN 201980102034A CN 114642017 A CN114642017 A CN 114642017A
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time unit
terminal
signal
network device
sub
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王婷
黄逸
张瑞
周国华
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Huawei Technologies Co Ltd
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Huawei Technologies Co Ltd
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W16/00—Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures
    • H04W16/24—Cell structures
    • H04W16/28—Cell structures using beam steering

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  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

A communication method and a device relate to the technical field of communication and aim to improve the reliability of receiving signals by a terminal which moves at a high speed in an LOS environment. Wherein the method comprises the following steps: the network device receiving a first set of pilot signals from the first terminal at a first time unit and receiving a second set of pilot signals from the first terminal at a second time unit; a first signal is then transmitted to the first terminal, and a transmission beam of the first signal is determined based on the first set of pilot signals and the second set of pilot signals, the first time unit and the second time unit being different. The technical scheme is favorable for improving the possibility of aligning the transmitting beam of the network equipment with the receiving beam of the terminal, thereby improving the reliability of the terminal for receiving the signal transmitted by the network equipment.

Description

Communication method and device Technical Field
The present application relates to the field of wireless communication technologies, and in particular, to a communication method and apparatus.
Background
The base station may transmit signals to the terminal using the transmission beam. In the prior art, a transmission beam used by a base station to transmit a signal to a terminal is determined by the base station according to a pilot signal transmitted by the terminal, or determined by the base station according to feedback information of the terminal. The technical scheme is generally suitable for terminals moving at low speed in a non-line of sight (NLOS) environment, such as mobile phones, tablet computers and the like. However, for a terminal moving at a high speed in a line of sight (LOS) environment, such as an Unmanned Aerial Vehicle (UAV) flying in the air, if a transmission beam used by a base station to transmit a signal to the terminal is determined by using the prior art, the terminal may not receive the signal transmitted by the base station using the determined transmission beam, resulting in poor reliability of communication between the base station and the terminal.
Disclosure of Invention
The application provides a communication method and a communication device, which are beneficial to improving the reliability of receiving signals by a terminal moving at a high speed in an LOS environment and improving the communication performance.
In a first aspect, an embodiment of the present application provides a communication method, which specifically includes: receiving a first set of pilot signals from the first terminal at a first time unit and a second set of pilot signals from the first terminal at a second time unit; then, a first signal is transmitted to the first terminal, wherein a transmission 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 and the second time unit are different.
In this embodiment, the network device may determine, according to two sets of pilot signals sent by the first terminal, a transmission beam used for sending the first signal to the terminal, where the two sets of pilot signals are sent by the terminal in different time units. Therefore, the possibility of aligning the transmitting beam of the base station with the receiving beam of the terminal is improved, the reliability of the terminal for receiving the signal transmitted by the network equipment is improved, and the communication performance is improved.
In one possible design, first indication information may be sent to the first terminal, where the first indication information may be used to indicate to the first terminal to send the first pilot signal group and the second pilot signal group. Compared with the periodic pilot signal transmission, the technical scheme is favorable for reducing the overhead of the pilot signal and further improving the communication performance. In addition, the first indication information is used for indicating and transmitting the first pilot signal group and the second pilot signal group, thereby reducing the overhead of the indication information and improving the communication performance.
In one possible design, the first indication information may be sent to the first terminal when a received power of a signal from the first terminal is less than or equal to a first threshold. It should be noted that the signal reception power from the first terminal refers to the reception power of the network device for receiving the signal from the first terminal.
Since the receiving performance of the first terminal on the signal of the network device may be poor when the signal receiving power from the first terminal is less than or equal to the first threshold, in this case, the first terminal is triggered to transmit two sets of pilot signals, and the transmission beam for transmitting the signal to the first terminal is readjusted, which is helpful to improve the reliability of the first terminal for receiving the signal of the network device.
In one possible design, the transmit beam of the first signal is determined from a first angle of arrival determined from the first set of pilot signals and a second angle of arrival determined from the second set of pilot signals; the first arrival angle is an arrival angle between the first terminal and the network device in the first time unit, and the second arrival angle is an arrival angle between the second terminal and the network device in the second time unit.
By the technical scheme, the sending beam of the first signal can be determined based on the arrival angle between the first terminal and the network equipment in the first time unit and the arrival angle between the first terminal and the network equipment in the second time unit, the accuracy of the sending beam of the signal sent to the first terminal by the network equipment can be improved, the reliability of the signal communicated between the network equipment and the first terminal is improved, and the implementation mode is facilitated to be simplified.
In one 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; wherein a first pilot signal from the first terminal is received in the first sub-time unit and a second pilot signal from the first terminal is received in the second sub-time unit. And 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 at different sub-time units in the first time unit, the accuracy of determining the angle of arrival between the first terminal and the network device at the first time unit is facilitated to be improved. Meanwhile, the first pilot signal group and the second pilot signal group can comprise a plurality of pilot signals, the scheme can meet the requirement that the first terminal has a plurality of transmitting beams and/or the network equipment has a plurality of receiving beams, the accuracy of the transmitting beams of the signals transmitted to the first terminal by the network equipment is improved, and the reliability of the signals communicated between the network equipment and the first terminal is improved.
In one possible design, second indication information indicating a time interval between a first location in the first sub-time unit and a second location in the second sub-time unit is sent to the first terminal.
By the technical scheme, the time interval between the first sub-time unit and the second sub-time unit is determined by the second indication information, so that the sending time of the pilot signal can be flexibly determined, the flexibility is improved, the overhead of the pilot signal can be further reduced, and the communication performance is improved.
In one possible design, the LOS path of the first pilot signal is the first LOS path; the arrival angle of the first LOS path is the arrival angle between the first terminal and the network equipment in the second sub-time unit; if a second signal from the second terminal is received in the first sub-time unit; the LOS path of the second signal is a second LOS path; when the second LOS path is different from the first LOS, the second signal is cancelled.
By the technical scheme, the interference of the second signal from the second terminal in the LOS scene can be eliminated, and the communication performance is further improved.
In one possible design, the signal received strength of the second signal is greater than or equal to the second threshold. By the technical scheme, the interference of a signal component with large interference can be eliminated in an LOS scene. Meanwhile, the complexity of interference cancellation can be reduced, that is, only the interference with the reception strength greater than or equal to the second threshold value is cancelled.
In one possible design, the second sub-time unit and the first sub-time unit are two sub-time units that are consecutive 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,
a 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 a third threshold;
wherein 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.
Through the technical scheme, the implementation mode is facilitated to be simplified. Meanwhile, based on the relationship between the arrival angles of the first sub-time unit and the second sub-time unit, the interference signal of the other sub-time unit can be determined based on the undisturbed pilot signal of one sub-time unit of the two sub-time units, so that the interference is eliminated, and the signal receiving performance is improved.
In one possible design, a first pilot signal from a first terminal is received via a first receive beam in a first sub-time unit; a second pilot signal from the first terminal is received through the second receive beam in a second sub-time unit.
Wherein the first receive beam and the second receive beam are the same or the first receive beam and the second receive beam are different.
In one possible design, the first set of pilot signals includes third pilot signals and the second set of pilot signals includes fourth pilot signals.
In one possible design, second indication information is sent to the first terminal, and the second indication information is used for indicating that a time interval between the first position of the first time unit and the second position of the second time unit is a second time interval. A first terminal is facilitated to determine a first time unit for transmitting a first set of pilot signals and a second time unit for transmitting a second set of pilot signals. Compared with a predefined method, the pilot signal group can be transmitted more flexibly and efficiently.
In one possible design, the second time interval is determined according to a moving speed of the first terminal. It is possible to improve the reliability of the transmission beam of the first signal determined from the first pilot signal group and the second pilot signal group. In addition, determining the second time interval based on the moving speed may select a suitable second time interval in consideration of different scenarios, which may further reduce pilot overhead.
In a second aspect, an embodiment of the present application provides a communication method, which specifically includes:
transmitting a first set of pilot signals to the network device at a first time unit and a second set of pilot signals to the network device at a second time unit; signals transmitted from a transmission beam of the network device are received, the transmission beam being determined from the first set of pilot signals and the second set of pilot signals. The first time unit is different from the second time unit.
In the embodiment of the application, 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, so that the network device can determine the sending beam used for sending the signal to the terminal according to the first pilot signal group and the second pilot signal group. Therefore, the possibility of aligning the transmitting beam of the base station with the receiving beam of the terminal is improved, the reliability of the terminal for receiving the signal transmitted by the network equipment is improved, and the communication performance is improved.
In one possible design, first indication information is received from a network device, and the first indication information is used for instructing a terminal to transmit a first pilot signal group and a second pilot signal group. Compared with the periodic pilot signal transmission, the technical scheme is favorable for reducing the overhead of the pilot signal and further improving the communication performance. In addition, the first indication information is used for indicating and transmitting the first pilot signal group and the second pilot signal group, thereby reducing the overhead of the indication information and improving the communication performance.
In one possible design, after the third time unit sends the pilot signal to the network device, a timer is started to start timing; if the pilot signal is not sent to the network equipment before the timer finishes timing, the first pilot signal group is sent to the network equipment in the first time unit and the second pilot signal group is sent to the network equipment in the second time unit after the timer finishes timing.
The timing duration of the timer may be predefined, may be indicated by the network device, or may be determined by the terminal according to a certain algorithm or policy, which is not limited herein. Specifically, the timing duration of the timer can be understood as: the timer counts the time length between the ending time and the timing starting time. The method is favorable for reducing the overhead of the pilot signal and further improving the communication performance. In addition, the problem that the beam tracking performance is poor and the communication performance is poor due to the fact that the pilot signal is not transmitted for a long time can be avoided
In one 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; and transmitting a first pilot signal to the network equipment in the first sub-time unit, and transmitting a second pilot signal to the network equipment in the second sub-time unit.
By transmitting pilot signals to the network device at different sub-time units in the first time unit, accuracy in determining the angle-of-arrival between the first terminal and the network device at the first time unit is improved. Meanwhile, the first pilot signal group and the second pilot signal group can comprise a plurality of pilot signals, the scheme can meet the requirement that the first terminal has a plurality of transmitting beams and/or the network equipment has a plurality of receiving beams, the accuracy of the transmitting beams of the signals transmitted to the first terminal by the network equipment is improved, and the reliability of the signals communicated between the network equipment and the first terminal is improved.
And the time interval between the first sub-time unit and the second sub-time unit is a first time interval.
In one possible design, a first pilot signal is transmitted to the network device via a first transmit beam in a first sub-time unit; and transmitting a second pilot signal to the network device through a second transmit beam in a second sub-time unit.
In one possible design, the first set of pilot signals includes a third pilot signal; the second set of pilot signals includes a fourth pilot signal.
In one possible design, the receiving network device sends second indication information indicating that a time interval between the first location of the first time unit and the second location of the second time unit is the second time interval.
By the technical scheme, the time interval between the first sub-time unit and the second sub-time unit is determined by the second indication information, so that the sending time of the pilot signal can be flexibly determined, the flexibility is improved, the overhead of the pilot signal can be further reduced, and the communication performance is improved. A first terminal is facilitated to determine a first time unit for transmitting a first set of pilot signals and a second time unit for transmitting a second set of pilot signals. Compared with a predefined method, the pilot signal group can be transmitted more flexibly and efficiently.
In one possible design, the second time interval is determined according to a moving speed of the terminal. It is possible to improve the reliability of the transmission beam of the first signal determined from the first pilot signal group and the second pilot signal group. In addition, determining the second time interval based on the moving speed may select a suitable second time interval in consideration of different scenarios, which may further reduce pilot overhead.
In a third aspect, an embodiment of the present application provides an interference cancellation method, which specifically includes: receiving a signal at a first time unit, the signal comprising a first signal component and a second signal component; canceling the second signal component when an angle of arrival of the second signal component satisfies a first condition.
In the embodiment of the present application, since the signal component whose arrival angle satisfies the first condition in the received signal can be eliminated, interference of the signal component whose arrival angle satisfies the first condition is avoided.
In one possible design, the signal received strength of the second signal component is greater than or equal to a first threshold. By the technical scheme, the interference of the signal component with large interference can be eliminated. Meanwhile, the complexity of interference cancellation can be reduced, that is, only the interference with the reception intensity greater than or equal to the first threshold is cancelled.
In one possible design, the first condition may be satisfied by the angle of arrival of the second signal component by:
an angle of arrival of the second signal component is greater than or equal to a second threshold; or,
an angle of arrival of the second signal component is within a first range; or,
the arrival angle of the second signal is the arrival angle of the signal transmitted by the aerial terminal; or,
the arrival angle of the second signal component is not the arrival angle of the ground terminal transmitting signal.
In a fourth aspect, an embodiment of the present application further provides an interference cancellation method, which specifically includes:
receiving a first signal at a first time unit; wherein the first signal comprises a first signal component and a second signal component; canceling the second signal component when the second LOS path is different from the first LOS path. The arrival angle of the first LOS path is the arrival angle of a second signal received in a second time unit; the LOS path of the second signal component is a second LOS path.
Illustratively, the first LOS path and the second LOS path are different, and may be understood as follows: the angle of arrival 1 is different from the angle of arrival 2, or the difference between the angle of arrival 1 and the angle of arrival 2 is not within the error range. The arrival angle 1 is an arrival angle of the first LOS path, that is, an arrival angle of the second signal received in the second time unit, that is, an arrival angle between the first terminal and the network device in the second time unit; the angle of arrival 2 is the angle of arrival when the second LOS path, i.e. the angle of arrival between the second terminal and the network device in the first time unit.
Wherein the LOS of the first signal component is the first LOS path. It is understood that angle of arrival 3 is the same as angle of arrival 1, or the difference between angle of arrival 3 and angle of arrival 1 is within the error range. Angle of arrival 3 is the angle of arrival of the first signal component, i.e. the angle of arrival between the first terminal and the network device in the first time unit.
In the embodiment of the application, the signal component of the received signal, in which the LOS is not the first LOS path, can be eliminated, so that interference from other terminals in the LOS environment can be eliminated.
In one possible design, the signal received strength of the second signal component is greater than or equal to a first threshold. By the technical scheme, the interference of the signal component with large interference can be eliminated. Meanwhile, the complexity of interference cancellation can be reduced, that is, only the interference with the reception intensity greater than or equal to the first threshold value is cancelled.
In one possible design, the first LOS path is determined from the second signal.
In one possible design, the second time unit and the first time unit are two time units that are consecutive 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,
an angle of arrival of the first signal component and an angle of arrival of a second signal are the same; or,
a difference between an angle of arrival of the first signal component and an angle of arrival of the second signal is less than or equal to a second threshold;
an angle of arrival of the first signal component is an angle of arrival between the first terminal and a network device at the first time unit; an angle of arrival of the second signal is an angle of arrival between the first terminal and the network device at the second time unit.
Through the technical scheme, the implementation mode is facilitated to be simplified. Meanwhile, based on the relationship between the arrival angles in the first time unit and the second time unit, the interference signal in another time unit can be determined based on the undisturbed pilot signal in one time unit of the two time units, so that the interference is eliminated, and the signal receiving performance is improved.
In a fifth aspect, an embodiment of the present application provides an apparatus, which includes a processor, and is configured to implement the method described in the foregoing aspects. The apparatus may also include a memory to store instructions and data. The memory is coupled to the processor, which when executing program instructions stored in the memory, may implement the methods of the various aspects described above, as well as any possible design descriptions of the various aspects. The apparatus may also include a communication interface for the apparatus to communicate with other devices, such as a transceiver, circuit, bus, module or other type of communication interface, which may be network devices or terminal devices, etc.
In one possible design, the apparatus includes:
a memory for storing program instructions;
a processor, configured to invoke instructions stored in the memory, so as to cause the apparatus to perform the method according to the first aspect and any one of the possible designs of the first aspect of the embodiment of the present application, or to cause the apparatus to perform the method according to the second aspect of the embodiment of the present application.
In a sixth aspect, embodiments of the present application also provide a computer-readable storage medium, which includes instructions that, when executed on a computer, cause the computer to perform the method of any one of the above aspects and aspects possible designs.
In a seventh aspect, an embodiment of the present application further provides a chip system, where the chip system includes a processor and may further include a memory, and is used to implement the method according to any one of the aspects and possible designs of the aspects. The chip system may be formed by a chip, and may also include a chip and other discrete devices.
In an eighth aspect, this application further provides a computer program product comprising instructions which, when run on a computer, cause the computer to perform the method of any one of the aspects and possible designs of the aspects.
In addition, the technical effects brought by any one of the possible design manners in the fifth aspect to the eighth aspect can be referred to the technical effects brought by the different design manners in the method part, and are not described herein again.
Drawings
FIG. 1 is a schematic diagram of a time cell according to an embodiment of the present application;
fig. 2 is a schematic network architecture of a communication system according to an embodiment of the present application;
fig. 3 is a flowchart illustrating a communication method according to an embodiment of the present application;
FIG. 4 is a schematic diagram of another time cell in accordance with an embodiment of the present application;
FIG. 5 is a schematic diagram of a location in a time cell according to an embodiment of the present application;
FIG. 6 is a schematic diagram of a beam tracking process according to an embodiment of the present application;
FIG. 7 is a schematic diagram of another time cell in accordance with an embodiment of the present application;
FIG. 8 is a schematic diagram of another beam tracking process according to an embodiment of the present application;
FIG. 9 is a schematic diagram of another beam tracking process according to an embodiment of the present application;
FIG. 10 is a schematic diagram of another beam tracking process according to an embodiment of the present application;
FIG. 11 is a schematic diagram of a communication scenario according to an embodiment of the present application;
fig. 12 is a flowchart illustrating an interference cancellation method according to an embodiment of the present application;
FIG. 13 is a schematic diagram of another communication scenario in accordance with an embodiment of the present application;
fig. 14 is a flowchart illustrating another interference cancellation method according to an embodiment of the present application;
FIG. 15 is a schematic diagram of an apparatus according to an embodiment of the present application;
fig. 16 is a schematic structural diagram of another apparatus according to an embodiment of the present application.
Detailed Description
It is to be understood that "at least one" in the embodiments of the present application means one or more. "plurality" means two or more. "and/or" describes the association relationship of the associated object, and indicates that three relationships can exist. For example, a and/or B, may represent: a is present alone, A and B are present simultaneously, and B is present alone. A, B may be singular or plural. The character "/" generally indicates that the former and latter associated objects are in an "or" relationship. "at least one of the following" or similar expressions refer to any combination of these items, including any combination of the singular or plural items. For example, at least one (one) of a, b, or c, may represent: a, b, c, a and b, a and c, b and c, or a, b and c. Where each of a, b, c may itself be an element or a collection of one or more elements.
In this application, "exemplary," "in some embodiments," "in other embodiments," and the like are used to mean serving as an example, instance, or illustration. Any embodiment or design described herein as "exemplary" is not necessarily to be construed as preferred or advantageous over other embodiments or designs. Rather, the term using examples is intended to present concepts in a concrete fashion.
In the present application, "of" and "corresponding" may sometimes be used in combination. It should be noted that the intended meaning is consistent when differences are not emphasized. In the embodiments of the present application, communication and transmission may be mixed sometimes, and it should be noted that the expressed meanings are consistent in a non-emphasized manner. For example, a transmission may include a transmission and/or a reception, may be a noun, and may be a verb.
It should be noted that the terms "first," "second," and the like in the embodiments of the present application are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or order.
In order to improve reliability of receiving, by a terminal moving at a high speed in an LOS environment, a signal sent by a network device, embodiments of the present application provide a communication method, so that the network device may determine, according to two sets of pilot signals sent by the terminal, a transmission beam used for sending a first signal to the terminal. Wherein the two sets of pilot signals are transmitted by the terminal in different time units. Therefore, the possibility of aligning the transmitting beam of the base station with the receiving beam of the terminal is improved, the reliability of the terminal for receiving the signal transmitted by the network equipment is improved, and the communication performance is improved.
Some terms related to the embodiments of the present application are explained below to facilitate understanding by those skilled in the art.
1. LOS environment. An LOS environment refers to a relatively stable and simple channel environment without obstructions. Such as the channel environment over the air. In the case of an obstacle, the signal may be transmitted by reflection, scattering, diffraction, and the like, the channel environment is relatively complex and unstable, and the relatively complex channel environment with the obstacle is generally referred to as an NLOS environment. LOS may also be referred to as line of sight, NLOS may also be referred to as non-line of sight.
2. And (4) a terminal. In the embodiment of the present application, a terminal is a device with a wireless transceiving function, and may be referred to as a terminal device, a User Equipment (UE), a Mobile Station (MS), a Mobile Terminal (MT), and the like. The terminal of the embodiment of the 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 may be understood as the moving speed not less than a certain threshold. For example, the threshold may be 100 m/s, 120 m/s, etc., and may be predefined by a communication protocol, or may be determined by the terminal according to a preset algorithm or rule, which is not limited thereto. By way of example, the specific form of the terminal may be a UAV, an onboard terminal, an airplane, a high-speed rail, a vehicle-mounted terminal, and the like. In particular, a UAV may be understood to be an aircraft that is maneuvered using radio remote control or self-contained programming. It should be noted that the terminal may support at least one wireless communication technology, such as Long Term Evolution (LTE), New Radio (NR), future communication technology, and the like.
3. A network device. In the embodiment of the present application, a network device 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 (RAN) device, and the like. Therein, the network device may support at least one wireless communication technology, such as LTE, NR, future communication technologies, and the like. Exemplary network devices include, but are not limited to: a next generation base station (generation node B, gNB), an evolved node B (eNB), a Radio Network Controller (RNC), a Node B (NB), a Base Station Controller (BSC), a Base Transceiver Station (BTS), a home base station (e.g., home evolved node B or home node B, HNB), a Base Band Unit (BBU), a transmission point (TRP), a Transmission Point (TP), a mobile switching center, a small station, a micro station, etc., in a fifth generation mobile communication system (5th-generation, 5G). The network device may 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 may be a relay station, an access point, a vehicle-mounted device, a terminal, a wearable device, and a network device in future mobile communication or a network device in a public mobile land network (PLMN) for future evolution, and the like.
4. A time unit. A time unit in the embodiments of the present application refers to a period of time in the time domain, and may include one or more sub-time units. The sub-time unit may be a basic time unit or an atomic time unit. Wherein a basic time unit is typically composed of one or more atomic time units. Illustratively, in the time domain, communication is performed between the terminal and the network device in units of basic time units. For example, the basic time unit may be a radio frame (radio frame), a subframe (subframe), a slot (slot), a micro-slot (micro-slot), a mini-slot (mini-slot), a symbol, or the like, which is not limited thereto. An atomic time unit may be a time unit of smaller granularity than a specified base time unit. For example, if the basic time unit is a time slot, the atomic time unit may be a symbol. For another example, if the basic time unit is a subframe, the atomic time unit may be a slot, a symbol, or the like. It should be noted that, in the embodiment of the present application, the time lengths of different basic time units may be the same or different, and are not limited thereto. For example, different subcarrier spacings correspond to different durations of a basic time unit. Take the basic time unit as the time slot as an example. For example, when the subcarrier spacing is 15kHz, the duration of one slot may be 1 ms; with a subcarrier spacing of 30kHz, the duration of one slot may be 0.5 ms.
Illustratively, a time unit is a basic time unit that includes one or more sub-time units, in which case the sub-time units are atomic time units. For example, taking the basic time unit as a slot as an example, one time unit is a slot and includes 14 symbols. In this case, the sub-time units are symbols. As another example, a time unit may include a plurality of basic time units, in which case, a sub-time unit may be a basic time unit or an atomic time unit. For example, taking a basic time unit as a radio frame, a time unit includes a plurality of radio frames, and a radio frame includes 10 subframes. In this case, the sub-time unit is a radio frame, or a subframe. For another example, taking a basic time unit as a subframe as an example, a time unit includes a plurality of subframes, a subframe includes one or more slots, and a slot includes one or more symbols. In this case, the sub-time unit is a subframe, or a slot, or a symbol. For another example, taking a basic time unit as a time slot as an example, one time unit includes a plurality of time slots, and one time slot includes one or more symbols. In this case, the sub-time unit is a slot, or a symbol.
As another example, where a basic time cell consists of an atomic time cell, e.g., a basic time cell is a symbol, a time cell may include one or more symbols, and sub-time cells are symbols. For another example, if a basic time unit is a time slot, a time unit may include one or more time slots, and the sub-time units are time slots. A slot is composed of a plurality of symbols, and the atomic time unit may be a symbol.
In addition, it should be noted that the time lengths of different time units in the embodiment of the present application may be different or the same, and are not limited thereto.
5. A pilot signal. Also referred to as Reference Signal (RS). The pilot signal may be used for channel sounding, channel measurement, cell selection, cell reselection, open loop power control, or the like. For example, the pilot signal may be a channel Sounding Reference Signal (SRS), a demodulation reference signal (DMRS), a channel state information-reference signal (CSI-RS), a Tracking Reference Signal (TRS), or other reference signals that can be used for beam Tracking, which is not limited in this respect.
It should be understood that the pilot signal carries information by means of a pilot sequence, i.e. the pilot sequence is part of the pilot signal, and the pilot sequences of different pilot signals are different.
6. A set of pilot signals. In the embodiment of the present application, the pilot signal group is a group of pilot signals, and the group of pilot signals are carried in the same time unit. One pilot signal group may include N pilot signals, and a value of N may be 1 or a positive integer greater than 1. For example, the value of N may relate to whether directional transmission or omni-directional transmission is used between the terminal and the network device. For example, omni-directional transmission is adopted 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, so the value of N may be 1, that is, one pilot signal is carried in one time unit. For another example, the terminal sends the pilot signal omnidirectionally, and the network device receives the pilot signal in a directional manner using M different receiving beams, so that the value of N may be less than or equal to M, for example, a time unit may carry M pilot signals. Further, the terminal directionally transmits the pilot signal by using K transmission beams, and the network device directionally receives the pilot signal by using M different reception beams, so that the value of N may be less than or equal to mxk, for example, one time unit may carry mxk pilot signals. For another example, the terminal directionally transmits the pilot signal by using K transmission beams, and the network device receives the pilot signal omni-directionally, so that the value of N may be less than or equal to K, for example, a time unit may carry K pilot signals. Wherein M, K is a positive integer.
Where multiple pilot signals are carried over a time unit, the multiple pilot signals are typically carried over different sub-time units. Taking time unit i shown in fig. 1 as an example, the pilot signal group i includes pilot signal i1 and pilot signal i2, pilot signal i1 is carried on sub-time unit i1, pilot signal i2 is carried on sub-time unit 2, and 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; alternatively, the pilot sequences of the pilot signals belonging to different pilot signal groups may be the same or different, and are not limited thereto. 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 policy, or may be signaled to the terminal by the network device. For example, the terminal may randomly determine a pilot sequence for the pilot signal.
In addition, it should be noted that, in this embodiment of the present application, the number of pilot signals carried in different time units may be the same or different, and is not limited thereto.
7. LOS path. In the embodiment of the present application, the LOS path refers to a straight propagation path of a radio signal between a transmitting end and a receiving end without shielding in an LOS environment.
The embodiment of the application can be applied to an LTE communication system, an NR communication system, and other communication systems, for example, a future mobile communication system (e.g., a 6G communication system). For example, as shown in fig. 2, a schematic diagram of a network architecture of a communication system according to an embodiment of the present application is shown, and the network architecture includes a network device and a terminal.
It should be noted that, in this embodiment of the application, the network device and the terminal may perform communication through a licensed spectrum (licensed spectrum), may also perform communication through an unlicensed spectrum (unlicensed spectrum), and may also perform communication through both a licensed spectrum and an unlicensed spectrum, which is not limited herein. The network device and the terminal may communicate with each other through a frequency spectrum of 6 gigahertz (GHz) or less, through a frequency spectrum of 6GHz or more, or through a frequency spectrum of 6GHz or less and a frequency spectrum of 6GHz or more. That is, the present application is applicable to both low frequency scenes (e.g., sub 6G) and high frequency scenes (e.g., 6G or greater).
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 number of network devices and the number of terminals in the communication system are not limited in the embodiments of the present application. For example, when a plurality of network devices are included in the communication system of the embodiment of the present application, communication between the network devices is possible. For example, the communication system includes a plurality of macro base stations and a plurality of micro base stations, where the macro base stations and the macro base stations, the micro base stations and the micro base stations, and the macro base stations and the micro base stations may perform multi-point cooperative communication. Illustratively, when the communication system of the embodiment of the present application includes a plurality of terminals, sidelink (sidelink) communication may be performed between the terminals. The communication method of the embodiment of the application is applicable to the various communication systems.
The communication method according to the embodiment of the present application will be described in detail by taking the network architecture of the communication system shown in fig. 2 as an example.
Illustratively, as shown in fig. 3, a schematic diagram of a communication method provided in an embodiment of the present application specifically includes the following steps.
In step 301, a first terminal sends a first pilot signal group to a network device at a first time unit.
Specifically, in this embodiment of the present application, the sending, by the first terminal, the first pilot signal group to the network device in the first time unit may be understood as: the first terminal transmits the first pilot signal group to the network equipment by carrying the first pilot signal group on the first time unit.
The location for carrying the first pilot signal in the first time unit may be predefined, or may be signaled by the network device to the first terminal, which is not limited to this.
Step 302, the first terminal sends a second pilot signal group to the network device in a second time unit. Wherein the first time unit and the second time unit are different.
Specifically, the first terminal sends the second pilot signal group to the network device in the second time unit, which can be understood as: the first terminal carries the second pilot signal group on the second time unit and sends the second pilot signal group to the network equipment. The location for carrying the second pilot signal in the second time unit may be predefined, or may be signaled by the network device to the first terminal, which is not limited to this.
It should be noted that, for the related description of the first time unit and the second time unit, reference may be made to the above-mentioned related explanation of the time units, and details are not described herein again.
Specifically, the first time unit and the second time unit are different, and it can be understood that: the time period of the first time unit carrying the first pilot signal group is not overlapped with the time period of the second time unit carrying the second pilot signal group. The first time unit and the second time unit may or may not have an overlapping portion, and this is not a limitation. For example, as shown in fig. 4, the first time unit includes a period a1, a period a2, and a period a3, and the second time unit includes a period b1, a period b2, and a period b 3. For example, the period a1 and the period a2 are periods for carrying the first pilot signal group, the period b1 and the period b2 are periods for carrying the second pilot signal group, there is no overlapping portion with the period b1 and the period b2 in the periods a1 and a2, that is, the period a1 and the period a2 are not overlapped with the period b1 and the period b 2. However, the time period a3 and the time period b3 may or may not have an overlapping portion, that is, the time period a3 and the time period b3 may or may not overlap, and are not limited thereto.
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 based on the first pilot signal group and the second pilot signal group.
In some embodiments, the network device determines a first angle of arrival from the first set of pilot signals; and determining a second angle of arrival from the second set of pilot signals. Then, the network device determines a 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 an angle of arrival between the first time unit, the first terminal and the network device; the second angle of arrival is an angle of arrival between the second time unit, the first terminal, and the network device.
For example, the network device may determine a first angle of arrival from a first pilot signal in the first set of pilot signals; a second angle of arrival is determined based on a second pilot signal in the second set of pilot signals. Then, the network device determines the angular velocity of the first terminal movement according to the first arrival angle and the second arrival angle, and then determines the precoding matrix according to the angular velocity of the first terminal movement. 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 transmit the first signal to the network device.
For example, if the first pilot signal group includes a plurality of pilot signals, the first pilot signal may be a pilot signal with the highest signal receiving 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. The algorithm used in determining the angle of arrival according to the pilot signal in the embodiment of the present application may be a multiple signal classification (MUSIC) algorithm, a Root-MUSIC algorithm, or an estimation of signal parameter Estimation (ESPRIT) algorithm based on a rotation invariant technique, which is not limited herein.
Take the example where the network device receives the first pilot signal on symbol s1 in the first time unit and the second pilot signal on symbol s2 in the second time unit. Note that the angle of arrival between the first terminal and the network device at the symbol s1 is a first angle of arrival, and the angle of arrival between the first terminal and the network device at the symbol s2 is a second angle of arrival. For example, the first angle of arrival includes Φ (s1) and θ (s1), where Φ (s1) is the horizontal angle between the first terminal and the network device at symbol s1, and θ (s1) is the vertical angle between the first terminal and the network device at symbol s 1; the second angle of arrival includes phi (s2) and theta (s2), where phi (s2) is the horizontal angle between the first terminal and the network device at symbol s2 and theta (s2) is the vertical angle between the first terminal and the network device at symbol s 2.
Wherein the angular velocity v of the terminal moving in the horizontal directionφSatisfying expression 1, the angular velocity of the terminal moving in the vertical direction satisfies expression 2:
Figure PCTCN2019119503-APPB-000001
Figure PCTCN2019119503-APPB-000002
N s1number N indicating symbol s1s2Number, T, denoting symbol s2sIndicating the duration of a symbol.
According to vφAnd vθA horizontal angle phi between the first terminal and the network device and a vertical angle theta between the first terminal and the network device may be predicted at the symbol s, where phi satisfies expression 3 and theta satisfies expression 4.
φ＝φ(s2)+(N s-N s2)T sv φExpression 3
θ＝θ(s2)+(N s-N s2)T sv θExpression 4
N sDenotes the serial number of the symbol s. Wherein N iss＞N s2＞N s1I.e. symbol s is located after symbol s2 and symbol s2 is located after symbol s 1.
While the precoding matrix wp,qSatisfies expression 5:
Figure PCTCN2019119503-APPB-000003
where a (φ, θ) is the steering vector, Δ d 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 is understood that when the total number of horizontal antennas is M, the total number of vertical antennas is N, and the antennas of the network device are M × N area arrays.
Substituting the predicted horizontal angle phi between the first terminal and the network device and the predicted vertical angle theta between the first terminal and the network device in the symbol s into expression 5 to obtain a precoding matrix w in the symbol sp,q. Wherein a precoding matrix w of symbols s is formedp,qAs the precoding matrix of the time unit in which the symbol s is located. Then the precoding matrix wp,qMultiplied by the first signal to form a transmit beam of the first signal.
The above is merely an example of a specific determination method of the transmission beam of the first signal, and does not limit the embodiment of the present application, and the transmission beam of the first signal may be determined in other manners in the embodiment of the present application.
In the embodiment of the present application, the first terminal may send the first pilot signal group and the second pilot signal group to the network device periodically and/or by timer triggering and/or by event triggering. 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 will be appreciated that the first terminal sending the first set of pilot signals and the second set of pilot signals to the network device triggered by a timer or an event helps to reduce the signaling overhead compared to periodically triggering the sending of the first set of pilot signals and the second set of pilot signals to the network device.
As an example, one way to trigger the first terminal to send the first pilot signal and the second pilot signal to the network device through the timer is as follows:
and the first terminal starts a timer to start timing after the first terminal sends the pilot signal to the network equipment in the third time unit. And if the pilot signal is not sent to the network equipment before the timing of the timer is finished, the first terminal sends the first pilot signal group and the second pilot signal group to the network equipment when the timing of the timer is finished. For example, the timing duration of the timer is 10 seconds, 20 seconds, or the like, which may be predefined, or may be determined by the first terminal according to a certain algorithm, or may be indicated to the first terminal by the network device, which is not limited to this. For example, the timing duration of the timer may be understood as: the timer counts the time length between the starting time and the ending time. The pilot transmission time may be understood as a timer starting time. When the timer counts time and meets the timing duration, the timing ending time of the timer can be understood as the time when the first terminal needs to send the pilot signal to the network device.
It is to be understood that the third time unit precedes the first time unit and the second time unit.
For example, the event triggering 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 first indication information from the network equipment. The first indication information is used for indicating the first terminal to transmit the first pilot signal group and the second pilot signal group.
Specifically, the network device sends first indication information to the first terminal, and after receiving the first indication information sent by the network device, the first terminal sends a first pilot signal group to the network device in a first time unit and sends a second pilot signal group to the network device in a second time unit. 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 first signal reception power is less than or equal to the first threshold. The first signal received power is the received power of the network device receiving the signal from the first terminal. For example, the first threshold may be XdB, and X may be a real number or an integer. When the first signal receiving power is less than or equal to the first threshold, the signal receiving power of the first terminal is lower for the network device, which may be caused by misalignment between the transmission beam of the network device and the reception beam of the first terminal, so that the network device sends the first indication information to the first terminal when detecting that the first signal receiving power is less than or equal to the first threshold, and triggers the first terminal to send the first pilot signal group and the second pilot signal group, thereby facilitating the network device to perform beam tracking according to the first pilot signal group and the second pilot signal group, acquiring more accurate beam information, and improving the communication performance between the network device and the first terminal. For another example, the network device may further send the first indication information to the first terminal when the signal sent by the first terminal is not received for a certain time period. For example, the time period may be 1 minute, 30 seconds, or the like. For another example, the network device may further send the first indication information to the first terminal when a packet loss rate or an error rate of a signal received from the first terminal exceeds a certain threshold.
It should be noted that the network device may send the first indication information to the first terminal by carrying the first indication information in a certain dynamic signaling (e.g., Downlink Control Information (DCI), other physical layer signaling, or the like). In addition, the above is merely an example of triggering the network device to send the first indication information, and does not form a limitation to the embodiment of the present application.
As another example, the event triggering 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 detects that the packet loss rate or the bit error rate of the signal received from the network equipment exceeds a certain threshold value. 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, transmits the first pilot signal group to the network device in the first time unit, and transmits the second pilot signal group to the network device in the second time unit. It should be noted that the fourth time unit precedes the first time unit and the second time unit.
As another example, the event triggering 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 detects that the signal reception power or strength of the signal received from the network device is below a certain threshold. For example, the first terminal receives the second signal from the network device in the fifth time unit, and transmits the first pilot signal group to the network device in the first time unit and transmits the second pilot signal group to the network device in the second time unit when the signal receiving power or strength of the second signal is lower than the threshold B. It should be noted that the fifth time unit precedes 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 have time intervals. 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 the second indication information to the first terminal. The second indication information is used for indicating that the time interval between the first time unit and the second time unit is the first time interval.
For ease of description, the interval between the first time unit and the second time unit will be referred to as a pilot interval hereinafter.
Specifically, the pilot interval can be understood as: a time interval between a first position of the first time unit and a second position of the second time unit. For example, the first position may be a start position of the first time unit, an end position of the first time unit, an intermediate position of the first time unit, or the like. The second position may be a start position of the second time unit, an end position of the second time unit, an intermediate position of the second time unit, or the like. For example, as shown in fig. 5, the starting position of the first time unit is T11, the ending position of the first time unit is T12, the middle position of the first time unit is T13, the starting position of the second time unit is T21, the ending 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 starting position of the first time unit and the starting position of the second time unit, then the pilot interval is the time interval between T11 and T21 as shown in fig. 5. For another example, if 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, the pilot interval is the time interval between T12 and T21 as shown in fig. 5. For another example, if 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, the pilot interval is the time interval between T11 and T22 as shown in fig. 5.
It should be noted that the first location may also be a starting location, an ending location, or an intermediate location of an nth sub-time unit included in the first time unit, and the second location may refer to the related description of the first location, which is not described herein again.
The unit of the pilot interval may be a time unit, a sub-time unit, a millisecond (ms), a second(s), or the like, and is not limited thereto. For example, the pilot interval may be N1 subframes, or M1 slots, or P1 symbols, or x 1ms, or y1 seconds, etc., where N1, M1, P1, x1, and y1 are integers greater than or equal to 0. In some embodiments, the pilot interval is determined based on the velocity of the first terminal. Wherein the larger the moving speed of the first terminal is, the smaller the pilot interval is. It is helpful to improve the likelihood that the network device determines that the transmit beam of the first signal is aligned with the receive beam of the first terminal. For example, the network device may configure multiple pilot intervals, with different pilot intervals corresponding to different ranges of movement speeds. 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. And if the moving speed of the first terminal is in the moving speed range 2, the first terminal sends a first pilot signal group and a second pilot signal group to the network equipment according to the pilot interval 2. In addition, in some embodiments, the network device may configure various pilot intervals by configuring various pilot patterns, pilot positions, pilot resources, or the like.
For example, the pilot interval may be determined by the first terminal according to the moving speed of the first terminal, or the network device may determine the pilot interval according to the moving speed of the first terminal. The moving speed of the first terminal may be determined by the network device according to a condition of a pilot signal or other signals sent by the first terminal, or may be reported by the first terminal, which is not limited herein.
The communication method of the embodiment of the present application is further described below with reference to different scenarios of signal transceiving modes.
Scene one: scanning without a beam. I.e. the first terminal omni-directionally transmits pilot signals and the network device omni-directionally receives pilot signals, in which case each of the aforementioned sets of pilot signals may comprise a pilot signal, i.e. a pilot signal is carried on a time unit.
That is, in the scenario of no beam scanning, the first terminal transmits one pilot signal in each of two time units during one beam scanning. Take the ith beam tracking procedure as an example. Wherein i is a positive integer greater than or equal to 1. In the ith beam tracking procedure, the first terminal transmits the pilot signal i1 to the network device in time unit i1, and transmits the pilot signal i2 to the network device in time unit i2, and correspondingly, the network device receives the pilot signal i1 from the first terminal in time unit i1, and receives the pilot signal i2 from the first terminal in time unit i 2. Then, the network device determines a transmission beam of the first signal from the pilot signal i1 and the pilot signal i 2. And the determined transmission beam of the first signal is the optimal beam direction for the network equipment to transmit the signal to the first terminal, so that the reliability of the first terminal for receiving the first signal transmitted by the network equipment can be improved, and the communication performance is improved. It should be noted that, for the ith beam tracking procedure, for example, the time unit i1 may be understood as the first time unit shown in fig. 4, and the time unit i2 may be understood as the second time unit shown in fig. 4.
For example, for a scenario without beam scanning, the time interval between two time units carrying pilot signals may be the same or different in different beam tracking processes. For example, as shown in fig. 6, in the mth beam tracking procedure, the pilot signal is carried in time unit M1 and time unit M2, respectively, and in the nth beam tracking procedure, the pilot signal is carried in time unit N1 and time unit N2, respectively, and the time interval M between time unit M1 and time unit M2 and the time interval N between time unit N1 and time unit N2 may be the same or different. For example, in 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 be further noted that the positions of the time unit m1 and the time unit m2, and the positions of the time unit n1 and the time unit n2 carrying the pilot signals may be the same or different; the locations where the pilot signals are carried by time cell m1 and time cell n1, and by time cell m2 and time cell n2 may be the same or different.
Scene two: beam scanning of multiple receive beams at the network device side. For example, the network device may include Y receive beams, but receive pilot signals directionally using V receive beams. Wherein V is less than or equal to Y. For example, the V receive beams are determined by the network device from the Y receive beams according to some algorithm or policy.
In this case, the first terminal may transmit V pilot signals to the network device in one time unit, i.e. one pilot signal group includes V pilot signals. And the network equipment 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 a transmit beam for transmitting a first signal to the first terminal based on the determined optimal receive beam.
For example, V pilot signals included in one pilot signal group may be the same or different. For example, if the V pilot signals are the same, the first terminal repeatedly transmits the V pilot signals to the network device at different times of a time unit.
V is the number of receiving beams used by the network device to directionally receive the pilot signal, which may be predefined, or may be notified to the first terminal by the network device through signaling, which is not limited herein.
The receiving beam used by the network device to directionally receive the pilot signal may be an analog beam, a digital beam, or a mixed beam (i.e., a beam in which an analog beam and a digital beam are mixed), which is not limited.
In some embodiments, only one receive beam may be used to receive signals at a time for a network device. Thus, the first terminal transmits a set of pilot signals to the network device at different times in a time unit. For example, the first time unit includes V sub-time units, and the first terminal may transmit the pilot signal to the network device in the V sub-time units, and correspondingly, the network device may receive the pilot signal from the first terminal in the V time units using different receive beams respectively. Specifically, the use of V sub time units in the first time unit by the first terminal may be determined according to a certain algorithm or policy, may also be indicated by the network device, and may also be predefined, which is not limited herein.
In a beam tracking procedure, the network device receives the pilot signals in two time units carrying two sets of pilot signals, usually using the same receive beam. Take the ith beam tracking procedure as an example. For example, in the ith beam tracking process, the pilot signal is typically received using the same receive beam at time unit i1 and time unit i 2. For example, the sub-time units in time unit i1 and time unit i2 that receive pilot signals using the same receive beam are corresponding, and for an understanding of the correspondence, reference may be made to the description of the embodiment of fig. 7 below. It should be noted that time unit i1 is a time unit carrying one set of pilot signals in the ith beam tracking process, and may be understood as the first time unit, and time unit i2 is a time unit carrying another set of pilot signals in the ith beam tracking process, and may be understood as the second time unit.
For example, the number of sub-time cells included in time cell i1 is the same as the number of sub-time cells included in time cell i 2. For example, as shown in FIG. 7, time cell i1 includes sub-time cell i11, sub-time cell i12, and sub-time cell i13, and time cell i2 includes sub-time cell i21, sub-time cell i22, and sub-time cell i 23. 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 i 23. That is, the network device receives the same receive beam for the pilot signal in sub-time unit i11 and sub-time unit i21, the same receive beam for the pilot signal in sub-time unit i12 and sub-time unit i22, and the same receive beam for the pilot signal in sub-time unit i13 and sub-time unit i 23.
It should be noted that the positions of sub-time cell i11 relative to time cell i1 and sub-time cell i21 relative to time cell i2 may be the same or different for sub-time cell i11 and sub-time cell i21, and the time duration of sub-time cell 11 and the time duration of sub-time cell 21 may be the same or different.
In addition, in different beam tracking processes, the receiving beams used by the network device may be the same or different. For example, as shown in fig. 8, the network device uses receive beam 1, receive beam 2, and receive beam 3 in the mth beam tracking procedure and the nth beam tracking procedure. Take the m-th beam tracking procedure as an example. In the mth beam tracking process, time cell m1 includes sub-time cells m11, m12, and m13, and time cell m2 includes sub-time cells m21, m22, and m23, where sub-time cell m11 corresponds to m21, m12 corresponds to m22, and m13 corresponds to m23, that is:
the first terminal transmits a pilot signal to the network device in sub-time unit m11, and correspondingly, the network device receives the pilot signal from the first terminal using the receive beam 1 in sub-time unit m 11; the first terminal transmits a pilot signal to the network device in sub-time unit m12, and correspondingly, the network device receives the pilot signal from the first terminal using the receive beam 2 in sub-time unit m 12; the first terminal transmits a pilot signal to the network device in sub-time unit m13, and correspondingly, the network device receives the pilot signal from the first terminal in sub-time unit m13 using receive beam 3. The first terminal transmits a pilot signal to the network device in sub-time unit m21, and correspondingly, the network device receives the pilot signal from the first terminal using the receive beam 1 in sub-time unit m 21; the first terminal transmits a pilot signal to the network device in sub-time unit m22, and correspondingly, the network device receives the pilot signal from the first terminal using the receive beam 2 in sub-time unit m 22; the first terminal transmits a pilot signal to the network device at sub-time unit m23, and correspondingly, the network device receives the pilot signal from the first terminal using receive beam 3 at sub-time unit n 23.
The network device determines a pilot signal with the greatest signal received power or strength from the pilot signals received at sub-time unit m11, sub-time unit m12, and sub-time unit m 13. The network device determines a pilot signal with the greatest signal received power or strength from the pilot signals received at sub-time unit m21, sub-time unit m22, and sub-time unit m 23. Then, the network device determines a transmission beam of the first signal according to the pilot signal with the largest signal reception power or strength in the time unit m2 and the pilot signal with the largest signal reception power or strength in the time unit m 1. The pilot signal with the maximum signal reception power or strength at time element m1 and the pilot signal with the maximum signal reception power or strength at time element m2 may be received by the network device using the same reception beam, or may be received by using different reception beams.
The method for determining the transmission beam of the first signal by the network device in the nth beam tracking process may refer to a method for determining the transmission beam of the first signal by the network device in the mth beam tracking process, which is not described herein again.
Scene three: beam scanning of multiple transmission beams on the terminal side. For example, the first terminal may include X transmit beams, but directionally transmit pilot signals using U transmit beams. Wherein U is less than or equal to X.
In this case, the first terminal may transmit U pilot signals to the network device in one time unit, i.e. one pilot signal group comprises U pilot signals. And then the network equipment can determine the optimal transmitting beam from the U transmitting beams according to the receiving conditions of the U pilot signals, and then inform the first terminal of the determined optimal transmitting beam. The network device may determine a transmission beam for transmitting the first signal to the first terminal from the determined optimal transmission beam.
For example, the U pilot signals included in one pilot signal group may be the same or different. For example, if U pilot signals are the same, the first terminal repeatedly transmits the pilot signals to the network device U times at different times in a time unit.
The number of the transmission beams used by U for the first terminal to directionally transmit the pilot signal may be predefined, or may be notified to the first terminal by the network device through a signaling, or may be determined by the first terminal based on a certain algorithm or rule according to an actual situation of the first terminal, which is not limited to this.
The transmission beam used by the first terminal for transmitting the pilot signal in the directional manner may be an analog beam, a digital beam, or a mixed beam (i.e., a beam in which an analog beam and a digital beam are mixed), and is not limited thereto.
In some embodiments, only one transmit beam can be used to transmit a signal at a time for the first terminal. Therefore, the first terminal transmits the pilot signal to the network device by using one transmission beam at different time of the first time unit. For example, the first time unit includes U sub-time units, and the first terminal may transmit the pilot signal to the network device using one transmission beam in each of the U sub-time units. The network device may receive pilot signals from different transmit beams of the first terminal. Specifically, the usage of U sub-time units in the first time unit by the first terminal may be determined according to a certain algorithm or policy, may also be indicated by the network device, may also be predefined, and is not limited thereto.
In a beam tracking procedure, the first terminal receives the pilot signals in the time unit carrying the two sets of pilot signals, usually using the same transmission beam. Take the ith beam tracking procedure as an example. For example, in the ith beam tracking process, the pilot signal is typically transmitted using the same transmit beam at time unit i1 and time unit i 2. For example, the sub time units in time unit i1 and time unit i2 that transmit pilot signals using the same transmit beam correspond. For a corresponding understanding of this, reference is likewise made to the description of the embodiment of fig. 7 which follows. It should be noted that time unit i1 is a time unit carrying one set of pilot signals in the ith beam tracking process, and may be understood as the first time unit, and time unit i2 is a time unit carrying another set of pilot signals in the ith beam tracking process, and may be understood as the second time unit.
For example, the number of sub-time cells included in time cell i1 is the same as the number of sub-time cells included in time cell i 2. For example, as shown in FIG. 7, sub-time unit i11 corresponds to sub-time unit i21, sub-time unit i12 corresponds to sub-time unit i22, and sub-time unit i13 corresponds to sub-time unit i 23. That is, the first terminal transmits the same transmission beam for transmitting the pilot signal in sub-time unit i11 and sub-time unit i21, transmits the same transmission beam for transmitting the pilot signal in sub-time unit i12 and sub-time unit i22, and transmits the same transmission beam for transmitting the pilot signal in sub-time unit i13 and sub-time unit i 23.
In addition, in the different beam tracking procedures, the transmission beam used by the first terminal may be the same or different. Illustratively, as shown in fig. 9, the first terminal uses the transmission beam 1, the transmission beam 2, and the transmission beam 3 in the m-th beam tracking procedure and the n-th beam tracking procedure. Take the m-th beam tracking procedure as an example. In the mth beam tracking procedure, time unit m1 includes sub-time units m11, m12, and m13, and time unit m2 includes sub-time units m21, m22, and m23, where sub-time unit m11 corresponds to m21, m12 corresponds to m22, and m13 corresponds to m23, e.g., the first terminal transmits a pilot signal using transmission beam 1 in sub-time unit m11, and correspondingly, the network device receives a pilot signal from the first terminal in sub-time unit m 11; the first terminal transmits a pilot signal using transmit beam 2 at sub-time unit m12, and correspondingly, the network device receives the pilot signal from the first terminal at sub-time unit m 12; the first terminal transmits a pilot signal using transmit beam 3 at sub-time unit m13, and correspondingly, the network device receives the pilot signal from the first terminal at sub-time unit m 13. The first terminal transmits a pilot signal using transmit beam 1 at sub-time unit m21, and correspondingly, the network device receives the pilot signal from the first terminal at sub-time unit m 21; the first terminal transmits a pilot signal using transmit beam 2 at sub-time unit m22, and correspondingly, the network device receives the pilot signal from the first terminal at sub-time unit m 22; the first terminal transmits a pilot signal using transmit beam 3 at sub-time unit m23, and correspondingly, the network device receives the pilot signal from the first terminal at sub-time unit m 23.
The network device determines a pilot signal with the greatest signal received power or strength from the pilot signals received at sub-time unit m11, sub-time unit m12, and sub-time unit m 13. The network device determines a pilot signal with the greatest signal received power or strength from the pilot signals received at sub-time unit m21, sub-time unit m22, and sub-time unit m 23. And determining a transmission beam of the first signal according to the pilot signal with the maximum signal receiving power or strength in the time unit m2 and the pilot signal with the maximum signal receiving power or strength in the time unit m 2. The pilot signal with the maximum signal reception power or intensity at time element m1 and the pilot signal with the maximum signal reception power or intensity at time element m1 may be transmitted by the first terminal using the same transmission beam or different transmission beams.
The method for determining the transmission beam of the first signal by the network device in the nth beam tracking process may refer to a method for determining the transmission beam of the first signal by the network device in the mth beam tracking process, which is not described herein again.
Scene four: beam scanning of multiple receive beams on the network device side and multiple transmit beams on the terminal side. For example, the first terminal may include X transmit beams and the network device may include Y receive beams, but the first terminal uses U transmit beam orientations to transmit pilot signals to the network device and the network device receives pilot signals from the first terminal using V receive beams. 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 transmission beam to transmit signals to the network device at a time and the network device can only use one reception beam to receive signals at a time, for one pilot signal, a combination of one transmission beam corresponding to the first terminal and one reception beam corresponding to the network device, that is, one pilot signal corresponds to one beam combination, where the beam combination includes one transmission beam of the first terminal and one reception beam of the network device. In the case where the first terminal transmits pilot signals to the network device using U transmit beam orientations and the network device receives pilot signals from the first terminal using V receive beams, there are U × V beam combinations of the transmit beam of the first terminal and the receive beam of the network device. The number of pilot signals that the first terminal may transmit to the network device in a time unit is related to the number of beam combinations used. For example, if the first terminal transmits the pilot signal using the transmission beam corresponding to Z beam combinations among the U × V beam combinations, the number of pilot signals that can be transmitted to the network device in one time unit is Z.
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 in this respect. For example, in a primary beam tracking process, the first terminal transmits the pilot signal using the transmission beam corresponding to which of the U × V beam combinations corresponds, which may be determined by the first terminal according to a certain algorithm or policy, or may be indicated to the terminal by the network device. It should be noted that, for one beam tracking procedure, the beam combination usually used by the two time units carrying the pilot signal group is the same. Taking the ith beam tracking procedure as an example, the same beam combination is typically used at time unit i1 and time unit i 2. Time unit i1 is a time unit carrying one set of pilot signals, and time unit i2 is a time unit carrying another set of pilot signals. For example, in one beam tracking process, the sub-time units using the same beam combination in time unit i1 and time unit i2 are corresponding. With respect to a corresponding understanding herein, the description of the embodiment of fig. 7 in scenario 2 or 3 above is similar. The beam combinations used by the two time units carrying the pilot signal group may be different or the same for different beam tracking procedures.
Illustratively, as shown in fig. 10, the first terminal directionally transmits pilot signals using transmit beam 1, transmit beam 2, and transmit beam 3, and the network device directionally receives pilot signals using receive beam 1, receive beam 2, and receive beam 3. In this case, there are 9 beam combinations, namely, beam combination 1 to beam combination 9, between the transmission beam of the first terminal and the reception beam of the network device. Wherein, beam combination 1 comprises a transmit beam 1 and a receive beam 1, beam combination 2 comprises a transmit beam 2 and a receive beam 2, beam combination 3 comprises a transmit beam 3 and a receive beam 3, beam combination 4 comprises a transmit beam 1 and a receive beam 2, beam combination 5 comprises a transmit beam 2 and a transmit beam 3, beam combination 6 comprises a transmit beam 1 and a receive beam 3, beam combination 7 comprises a transmit beam 2 and a receive beam 1, beam combination 8 comprises a transmit beam 3 and a receive beam 1, and beam combination 9 comprises a transmit beam 3 and a receive beam 2.
For example, in the mth beam tracking procedure, the beam combinations used in the sub-time units of time unit m1 and time unit m2 are beam combination 1, beam combination 2, and beam combination 3, respectively, while in the nth beam tracking procedure, the beam combinations used in the sub-time units of time unit n1 and time unit n2 are beam combination 3, beam combination 4, and beam combination 5, respectively. In the nth beam tracking procedure, the beam combinations used in the sub-time units of time element n1 and time element n2 may be beam combination 1, beam combination 2, and beam combination 3, respectively, which are the same as the beam combinations used in the mth beam tracking procedure.
Take the m-th beam tracking procedure as an example. As shown in fig. 10, time unit m1 includes sub-time units m11, m12 and m13, and time unit m2 includes sub-time units m21, m22 and m23, where sub-time unit m11 corresponds to m21, m12 corresponds to m22, and m13 corresponds to m23, for example, the first terminal transmits a pilot signal to the network device using transmission beam 1 in sub-time unit m11, and correspondingly, the network device receives a pilot signal from the first terminal using reception beam 1 in sub-time unit m 11; the first terminal transmits a pilot signal to the network device using transmit beam 2 in sub-time unit m12, and correspondingly, the network device receives a pilot signal from the first terminal using receive beam 2 in sub-time unit m 12; the first terminal transmits a pilot signal to the network device using transmit beam 3 in sub-time unit m13, and correspondingly, the network device receives a pilot signal from the first terminal using receive beam 3 in sub-time unit m 13. The first terminal transmits a pilot signal using transmit beam 1 in sub-time unit m21, and correspondingly, the network device receives a pilot signal from the first terminal using receive beam 1 in sub-time unit m 21; the first terminal transmits a pilot signal using transmit beam 2 at sub-time unit m22, and correspondingly, the network device receives a pilot signal from the first terminal using receive beam 2 at sub-time unit m 22; the first terminal transmits a pilot signal using transmit beam 3 at sub-time unit m23, and correspondingly, the network device receives a pilot signal from the first terminal using receive beam 3 at sub-time unit m 23. Then, the network device may determine a pilot signal with the greatest signal reception strength or power from among the pilot signals received in sub-time unit m11, sub-time unit m12, and sub-time unit m13, respectively, and determine a pilot signal with the greatest signal reception strength or power from among the pilot signals received in sub-time unit m21, sub-time unit m22, and sub-time unit m23, respectively. Then, a transmission beam of the first signal is determined according to the pilot signal having the maximum signal reception strength or power received at time unit m1 and time unit m2, respectively. The beam combination used for the pilot signal with the maximum signal reception power or strength in time element m1 may be the same as or different from the beam combination used for the pilot signal with the maximum signal reception power or strength in time element m 2.
It should be noted that in the above scenarios one to four, the related beam tracking procedure includes that the first terminal respectively transmits a set of pilot signals in two time units.
In addition, in an LOS scenario, radio signals can propagate straight between the terminal and the network device without shielding, and when different terminals transmit signals simultaneously in an LOS environment, mutual interference among the signals is easily caused. For example, as shown in fig. 11, a terminal 1 transmits a signal to a network device 1, a terminal 2 transmits a signal to a network device 2, and since the terminal 1 and the terminal 2 transmit signals simultaneously, if the network device 1 receives a signal from the terminal 2, in the case that the signal transmitted by the terminal 1 is not orthogonal to the signal transmitted by the terminal 2, the signal from the terminal 2 interferes with the network device 1 receiving the signal from the terminal 1, and correspondingly, if the network device 2 receives the signal from the terminal 1, the signal from the terminal 1 interferes with the network device 2 receiving the signal from the terminal 2. In view of this, the embodiment of the present application further provides an interference cancellation method, which can enable a network device to perform interference cancellation based on an LOS path, so as to improve communication performance.
Illustratively, as shown in fig. 12, a method for interference cancellation according to an embodiment of the present application specifically includes the following steps.
In step 1201, the network device receives a first signal at time unit 1. The first signal includes a first signal component and a second signal component.
In step 1202, the network device cancels the second signal component when the LOS path 1 is different from the LOS path 2.
Wherein, the arrival angle of the LOS path 1 is the arrival angle 1. Angle of arrival 1 is the angle of arrival between time cell 2, the network device and the first terminal. LOS via 2 is the LOS path of the second signal component. The LOS path of the first signal component is LOS path 1.
Illustratively, the first LOS path and the second LOS path are different, and can be understood as follows: 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. The arrival angle 1 is an arrival angle of the first LOS path, that is, an arrival angle of the second signal received in the second time unit, that is, an arrival angle between the first terminal and the network device in the second time unit; the angle of arrival 2 is the angle of arrival when the second LOS path, i.e. the angle of arrival between the second terminal and the network device in the first time unit.
Wherein the LOS of the first signal component is the first LOS path. It is understood that angle of arrival 3 is the same as angle of arrival 1, or the difference between angle of arrival 3 and angle of arrival 1 is within the error range. Angle of arrival 3 is the angle of arrival of the first signal component, i.e. the angle of arrival between the first terminal and the network device in the first time unit.
In the embodiment of the application, the signal component of the received signal, in which the LOS is not the first LOS path, can be eliminated, so that interference from other terminals in the LOS environment can be eliminated.
Illustratively, angle of arrival 1 is determined by the network device from the second signal transmitted by the first terminal. For a specific manner of determining the arrival angle according to the signal, reference may be made to the implementation manner of determining the arrival angle according to the pilot signal, which is not described herein again.
In particular, the first signal component may be understood as a useful signal component, since for the network device the first signal component is a signal transmitted from the first terminal in time unit 1, which is a useful signal, and the second signal component may be understood as an interfering signal component, since for the network device the second signal component is a signal transmitted from the second terminal in time unit 1, which is an interfering signal. The second terminal and the first terminal are different terminals. The second signal is understood to be a useful signal, which for the network device is the signal transmitted from the first terminal in time unit 2.
It will be appreciated that the network device receives the first signal at time element 1 and the second signal at time element 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, the network device may determine, according to the second signal, an arrival angle 1 and an LOS path 1 between the first terminal and the network device under the condition that the first signal is an interfered signal and the second signal is an undisturbed signal, and further identify an interfering signal in the first signal according to the determined arrival angle 1 and LOS path 1, thereby eliminating the interfering signal. The interfered signal refers to a signal including an interference signal component in the signal.
In this embodiment, because the first pilot signal sent by the first terminal in time unit 1 and the second pilot signal sent by the first terminal in time unit 2 may be determined by themselves or may be indicated by the network device, and the probability that the pilot sequences of the pilot signals sent in different time units all collide with the pilot signals sent by other terminals is relatively low, the network device may determine the angle of arrival and the LOS path between the first terminal and the network device based on the pilot signals that are received without interference in time units 1 and 2, and further identify the interference signal in the received interfered pilot signals, thereby eliminating the interference signal.
Illustratively, the first terminal receives third indication information of the network device, where the third indication information is used to instruct the first terminal to transmit the first pilot signal and the second pilot signal to the network device. For example, the first terminal transmits the first pilot signal in time unit 1 and the second pilot signal in time unit 2 according to the third indication information.
In some embodiments, the network device may detect whether the received signal is a disturbed signal through a spatial matched filter. For example, if the signal includes signal components from two or more LOS paths, the signal is a disturbed signal. If the signal includes only signal components from one LOS path, the signal is an undisturbed signal.
For example, the network device may detect, by the spatial filter, whether or not a plurality of signal components whose arrival angles satisfy the first condition are included in the signal, and take the signal component whose arrival angle satisfies the first condition as the signal component from the LOS path 1. The first condition may be predefined or may be determined by the network device according to some algorithm or rule. For example, the network device is determined through machine learning. For example, the signal component whose arrival angle satisfies the first condition may mean that the arrival angle is within the first arrival angle range, or is not within the second arrival angle range, or the arrival angle is greater than or equal to a threshold. It should be noted that the angle of arrival satisfying the first condition may be referred to as an angle of arrival between the air terminal and the network device, and is simply referred to as an air terminal angle of arrival. For example, the arrival angle that does not satisfy the first condition may be referred to as an arrival angle between the ground terminal and the network device, or simply referred to as a ground terminal arrival angle.
For example, signal components included in the signalp,qIncluding the horizontal angle phipAnd a vertical angle thetaqWherein the horizontal angle phipIndicating transmitted signal componentsp,qThe terminal and the network device form an included angle in the horizontal direction and a vertical angle thetaqIndicating transmitted signal componentsp,qThe terminal and the network device form an included angle in the vertical direction.
Wherein the horizontal angle phipSatisfies expression 6, vertical angle θqFull expression 7:
Figure PCTCN2019119503-APPB-000004
Figure PCTCN2019119503-APPB-000005
signal componentp,qSignal received power T ofp,qExpression 8 is satisfied:
Figure PCTCN2019119503-APPB-000006
Figure PCTCN2019119503-APPB-000007
is a precoding matrix, and
Figure PCTCN2019119503-APPB-000008
a (phi, theta) is a guide vector, LφNumber of horizontal antennas, LθThe number of the vertical antennas is the same as the number of the vertical antennas,
Figure PCTCN2019119503-APPB-000009
representing the channel estimated from the signal.
For a certain signal, if there are multiple angles of arrival (phi)p，θ q) Satisfies a first condition and corresponds to the signal received powers T of the multiple angles of arrivalp,qIf not, the signal is determined to be an interfered signal, including both interfering and useful signal components.
Illustratively, for a certain signal, if there are one or more angles of arrival (φ)p，θ q) A signal received power T satisfying a first condition and corresponding to only one of the plurality of angles of arrivalp,qIf not, determining the messageThe number is the undisturbed signal. Receiving the signal with power Tp,qThe signal component which is not 0 and whose arrival angle satisfies the first condition is a desired signal component whose transmission path is the LOS path. Taking the second signal as an example, the LOS path of the desired signal component is LOS path 1.
Taking the first signal as an example, from the signal components of a plurality of arrival angles satisfying the first condition, the arrival angle of which the difference with the arrival angle 1 is less than or equal to a certain threshold value or the signal component of the arrival angle with the same angle as the arrival angle 1 is determined, and the arrival angle is taken as the first signal component of the LOS path 1.
As another example, a signal transmitted on a channel satisfying expression 9 in the first signal is taken as a signal component whose LOS path is LOS path 1, that is, the first signal component.
Figure PCTCN2019119503-APPB-000010
Wherein A ═ a (φ)0,θ 0),a(φ 1,θ 1),...,a(φ Lφ-1,θ Lθ-1)]。
Illustratively, in order to keep the LOS path of the signals transmitted by the first terminal to the network device substantially unchanged or unchanged at time unit 1 and time unit 2, in some embodiments, time unit 1 and time unit 2 are two time units that are consecutive in time. For example, as shown in fig. 12, time unit 1 and time unit 2 are two time units that are consecutive 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 time cell 1 and time cell 2 may satisfy: the angle of arrival 2 and the angle of arrival 1 are the same, or the difference between the angle of arrival 2 and the angle of arrival 1 is less than or equal to the threshold 0. Where the angle of arrival 1 is an angle of arrival between the time unit 2, the first terminal, and the network device, and the angle of arrival 2 is an angle of arrival between the time unit 1, the first terminal, and the network device. Where angle of arrival 1 is the angle of arrival of the second signal from the first terminal received by the network device at time unit 2, and angle of arrival 2 is the angle of arrival of the signal (i.e., the first signal component) from the first terminal received by the network device at time unit 1. The threshold 0 may be predefined, or may be determined according to some algorithm or rule, which is not limited to this.
It should be noted that, the time interval between the time unit 1 and the time unit 2 can be referred to the above-mentioned related description of the time interval between the first time unit and the second time unit, and is not described herein again. Specifically, the time interval between the time unit 1 and the time unit 2 may be predefined, or the time interval is notified to the first terminal by the network device through signaling, or the network device determines according to the moving speed of the first terminal, and the determination manner of the time interval between the time unit 1 and the time unit 2 is not limited in the embodiment of the present application.
Further, in some embodiments, the signal received strength or power of the second signal component is greater than or equal to threshold1, i.e., the second signal component is cancelled when the signal received strength or power of the second signal component is greater than or equal to threshold 1. The threshold1 may be predefined, or may be determined according to some algorithm or rule, which is not limited to this. That is, for an interference signal component with small signal reception intensity or power, the interference to the useful signal component is small or negligible, and therefore, interference cancellation may not be performed, which contributes to simplification of implementation. However, for an interference signal component having a large signal reception intensity or power, interference with a useful signal component is large, and therefore, interference cancellation is required.
Illustratively, threshold 1(threshold1) satisfies expression 10:
threhold1＝K·Σ p,qT p,qexpression 10
Where K is a constant, and may be predefined, or determined according to an algorithm or policy, and T is not limited theretop,qExpression 8 is satisfied.
It should be noted that time unit 1 and time unit 2 in the embodiment of the present application may be understood as sub-time units in the above embodiment, and may also be time units.
Taking the example that the first time unit includes the first sub-time unit and the second sub-time unit, the network device receives the first pilot signal from the first terminal in the first sub-time unit, receives the second pilot signal from the first terminal in the second sub-time unit, and 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 pilot signal from the first terminal and the third signal from the second terminal. The signal received by the network device in the second sub-time unit includes only the second pilot signal from the first terminal. The first pilot signal and the third signal are signal components of a signal 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. The LOS path of the first pilot signal is LOS path 1, the arrival angle of the LOS path 1 is arrival angle 1, and the arrival angle 1 is the same as the arrival angle 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, so the network device 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, and contributing to improving channel estimation. For example, the third signal may be a pilot signal, wherein the pilot sequence of the third pilot signal is the same as the pilot sequence of the first pilot signal.
In addition, transmission of radio signals in LOS scenarios can also cause interference to signal transmission in non-LOS scenarios, thereby affecting communication of terminals (e.g., ground terminals) in non-LOS scenarios. For example, as shown in fig. 13, in an LOS scenario, terminal 1 transmits a signal to network device 1, and in a non-LOS scenario, terminal 2 transmits a signal to network device 2, when terminal 1 and terminal 2 transmit signals simultaneously, and if network device 2 receives a signal from terminal 1, the signal from terminal 1 may cause interference to network device 2 receiving the signal from terminal 2. In an LOS scenario, a wireless signal may propagate straight between the terminal and the network device without being blocked, so that the signal from the terminal 1 may cause severe interference to the network device 2 receiving the signal from the terminal 2.
Illustratively, as shown in fig. 14, another interference cancellation method provided for the embodiment of the present application specifically includes the following steps.
In step 1401, a network device receives a signal at time unit 1, the signal comprising a first signal component and a second signal component.
Step 1402, when the angle of arrival of the second signal component satisfies a second condition, eliminating the second signal component.
It should be noted that the second condition may be predefined, or may be determined by the network device according to a predefined algorithm or policy, which is not limited herein. For example, the angle of arrival of the second signal component satisfies the second condition, and reference may be made to the description of fig. 11 for the signal component whose angle of arrival satisfies the first condition, which is not described herein again.
For example, the network device may detect, by the spatial filter, whether or not a plurality of signal components whose arrival angles satisfy the second condition are included in the signal, and take the signal component whose arrival angle satisfies the second condition as the signal component from the LOS path. The second condition may be predefined or may be determined by the network device according to some algorithm or rule. For example, the network device is determined through machine learning.
For example, the signal component whose arrival angle satisfies the second condition may mean that the arrival angle is within the third arrival angle range, or is not within the fourth arrival angle range, or is greater than or equal to a threshold. It should be noted that the angle of arrival satisfying the second condition may be referred to as an angle of arrival between the aerial terminal and the network device, which is referred to as an aerial terminal angle of arrival for short. For example, the arrival angle that does not satisfy the second condition may be referred to as an arrival angle between the ground terminal and the network device, which is referred to as a ground terminal arrival angle for short.
For example, in the embodiment of the present application, after receiving a signal in time unit 1, the network device detects a signal component in the signal. For example, the network device may detect a signal component included in the signal through a spatial matched filter. For example, a signal component whose arrival angle satisfies the second condition is taken as the second signal component, and a signal component whose arrival angle does not satisfy the second condition is taken as the first signal component.
For example, the network device may determine a signal component included in the received signal, and an angle of arrival and a 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 threshold 2. For example, the threshold 2 may refer to a specific implementation of the threshold1, and is not described herein again. The threshold 2 may be predefined, or may be determined according to some algorithm or rule, which is not limited to this. That is, for an interference signal component with small signal reception intensity or power, the interference to the useful signal component is small or negligible, and therefore, interference cancellation may not be performed, which contributes to simplification of implementation. However, for an interference signal component having a large signal reception intensity or power, interference with a useful signal component is large, and therefore, 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 herein.
The above embodiments can be used independently or in combination with each other to achieve different technical effects.
In the embodiments provided in the present application, the communication method provided in the embodiments of the present application is described from the perspective of the terminal device as an execution subject. In order to implement each function in the communication method provided in the embodiment of the present application, the terminal device may include a hardware structure and/or a software module, and implement each function in the form of a hardware structure, a software module, or a hardware structure and a software module. Whether any of the above-described functions is implemented as a hardware structure, a software module, or a hardware structure plus a software module depends upon the particular application and design constraints imposed on the technical solution.
Similar to the above concept, as shown in fig. 15, an apparatus 1500 is further provided in the embodiment of the present application, where the apparatus 1500 includes a transceiver module 1502 and a processing module 1501.
In one example, the apparatus 1500 is configured to implement the functions of the terminal in the foregoing method. The apparatus 1500 may be a network device or an apparatus in a network device. Wherein the apparatus may be a system-on-a-chip. In the embodiment of the present application, the chip system may be composed of a chip, and may also include a chip and other discrete devices.
As an example, processing module 1501 may be configured to determine a transmit beam of a first signal. The transceiving module 1502 is configured to receive a first set of pilot signals from a first terminal in a first time unit and receive a second set of pilot signals from the first terminal in a second time unit or transmit a first signal to the first terminal.
In one example, the apparatus 1500 is configured to implement the functions of the terminal device in the foregoing method. The apparatus 1500 may be a terminal device, or an apparatus in a terminal device. Wherein the apparatus may be a system-on-a-chip. In the embodiment of the present application, the chip system may be formed by a chip, and may also include a chip and other discrete devices.
The transceiver module 1502 is configured to transmit a first pilot signal group to the network device in a first time unit, transmit a second pilot signal group to the network device in a second time unit, and receive a first signal from the network device. The processing module 1501 is configured to trigger the transceiver module 1502 to transmit the first pilot signal group and the second pilot signal group.
For specific execution processes of the processing module 1501 and the transceiver module 1502, reference may be made to the above description in the method embodiments. The division of the modules in the embodiments of the present application is schematic, and only one logical function division is provided, and in actual implementation, there may be another division manner, and in addition, each functional module in each embodiment of the present application may be integrated in one processor, may also exist alone physically, or may also be integrated in one module by two or more modules. The integrated module can be realized in a hardware mode, and can also be realized in a software functional module mode.
Similar to the above concept, as shown in fig. 16, the embodiment of the present application further provides an apparatus 1600.
In an example, the apparatus 1600 is configured to implement the functions of the terminal in the foregoing method, and the apparatus 1600 may be a network device, or an apparatus in a network device. The apparatus 1600 includes at least one processor 1601 for implementing the functions of the network device in the above-described method. Illustratively, the processor 1601 may be configured to determine a transmit beam of the first signal.
In some embodiments, the apparatus 1600 may also include at least one memory 1602 for storing program instructions and/or data. A memory 1602 is coupled to the processor 1601. The coupling in the embodiments of the present application is a spaced coupling or communication connection between devices, units or modules, and may be in an electrical, mechanical or other form, and is used for information interaction between the devices, units or modules. As another implementation, the memory 1602 may also be located outside of the apparatus 1600. The processor 1601 may operate in conjunction with the memory 1602. Processor 1601 may execute program instructions stored in memory 1602. At least one of the at least one memory may be included in the processor.
In some embodiments, apparatus 1600 may also include a communication interface 1603 for communicating with other devices over a transmission medium so that the apparatus used in apparatus 1600 may communicate with other devices. Illustratively, the communication interface 1603 may be a transceiver, circuit, bus, module, or other type of communication interface, which may be a network device. The processor 1601 utilizes the communication interface 1603 to send and receive data and is used to implement the methods in the embodiments described above. Illustratively, communication interface 1603 is for receiving a first set of pilot signals and a second set of pilot signals, or transmitting a first signal.
In an example, the apparatus 1600 is used to implement the functions of the terminal in the above method, and the apparatus 1600 may be a terminal, and may also be an apparatus in a terminal. The apparatus 1600 includes at least one processor 1601 configured to implement the functions of the first terminal in the above-described method. For example, the processor 1601 may be configured to trigger sending of the first pilot signal group and the second pilot signal group, which is described in detail in the method and is not described herein.
In some embodiments, the apparatus 1600 may also include at least one memory 1602 for storing program instructions and/or data. A memory 1602 is coupled to the processor 1601. The coupling in the embodiments of the present application is a spaced coupling or communication connection between devices, units or modules, and may be in an electrical, mechanical or other form, which is used for information interaction between the devices, units or modules. As another implementation, the memory 1602 may also be located outside of the apparatus 1600. The processor 1601 may operate in conjunction with the memory 1602. Processor 1601 may execute program instructions stored in memory 1602. At least one of the at least one memory may be included in the processor.
In some embodiments, apparatus 1600 may also include a communication interface 1603 for communicating with other devices over a transmission medium so that apparatus used in apparatus 1600 may communicate with other devices. Illustratively, communication interface 1603 may be a transceiver, circuit, bus, module, or other type of communication interface, which may be a terminal. The processor 1601 receives and transmits data using the communication interface 1603 and is used to implement the methods in the embodiments described above. Illustratively, communication interface 1603 may transmit a first set of pilot signals and a second set of pilot signals or receive a first signal.
The embodiment of the present application does not limit the connection medium among the communication interface 1603, the processor 1601, and the memory 1602. For example, in fig. 16, the memory 1602, the processor 1601 and the communication interface 1603 may be connected through a bus, which may be divided into an address bus, a data bus, a control bus, and the like.
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, and may implement or execute the methods, steps, and logic blocks 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 a method disclosed in connection with the embodiments of the present application may be directly implemented by a hardware processor, or may be implemented by a combination of hardware and software modules in a processor.
In the embodiment of the present application, the memory may be a nonvolatile memory, such as a Hard Disk Drive (HDD) or a solid-state drive (SSD), and may also be a volatile memory, for example, a random-access memory (RAM). The memory is any other medium that can be used to carry or store desired program code in the form of instructions or data structures and that can be accessed by a computer, but is not limited to such. The memory in the embodiments of the present application may also be circuitry or any other device capable of performing a storage function for storing program instructions and/or data.
The method provided by the embodiment of the present application may be implemented in whole or in part by software, hardware, firmware, or any combination thereof. When implemented in software, may be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions. When loaded and executed on a computer, cause the processes or functions described in accordance with the embodiments of the invention to occur, in whole or in part. The computer may be a general purpose computer, a special purpose computer, a computer network, a network appliance, a user device, or other programmable apparatus. The computer instructions may be stored on a computer readable storage medium or transmitted from one computer readable storage medium to another, for example, the computer instructions may be transmitted from one website, computer, server, or data center to another website, computer, server, or data center via wire (e.g., coaxial cable, fiber optic, Digital Subscriber Line (DSL)), or wireless (e.g., infrared, wireless, microwave, etc.). The computer-readable storage medium can be any available medium that can be accessed by a computer or a data storage device, such as a server, a data center, etc., that incorporates one or more of the available media. The usable medium may be a magnetic medium (e.g., a floppy disk, a hard disk, a magnetic tape), an optical medium (e.g., a Digital Video Disk (DVD)), or a semiconductor medium (e.g., an SSD), among others.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present application without departing from the scope of the application. Thus, if such modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is intended to include such modifications and variations as well.

Claims (19)

  1. A method of communication, the method comprising:
    receiving a first set of pilot signals from a first terminal at a first time unit and a second set of pilot signals from the first terminal at a second time unit; the first time unit and the second time unit are different;
    transmitting a first signal to the first terminal, a transmission beam of the first signal being determined from the first set of pilot signals and the second set of pilot signals.
  2. The method of claim 1, wherein the method further comprises:
    and sending first indication information to the first terminal, wherein the first indication information is used for indicating the first terminal to send the first pilot signal group and the second pilot signal group.
  3. The method of claim 1 or 2, wherein the transmit beam for the first signal is determined from the first set of pilot signals and the second set of pilot signals, comprising:
    a transmit beam of the first signal is determined from a first angle of arrival determined from the first set of pilot signals and a second angle of arrival determined from the second set of pilot signals;
    wherein the first angle of arrival is an angle of arrival between the first terminal and a network device at the first time unit; the second angle of arrival is an angle of arrival between the first terminal and the network device at the second time unit.
  4. The method of any of claims 1 to 3, wherein the first time unit comprises a first sub-time unit and a second sub-time unit, the first set of pilot signals comprises a first pilot signal and a second pilot signal;
    the receiving a first set of pilot signals from a first terminal at a first time unit includes:
    receiving a first pilot signal from the first terminal at the first sub-time unit and receiving the second pilot signal from the first terminal at the second sub-time unit.
  5. The method of claim 4, wherein the line-of-sight, LOS, path of the first pilot signal is a first LOS path; the arrival angle of the first LOS path is a third arrival angle; the third angle of arrival is an angle of arrival between the first terminal and the network device at the second sub-time unit;
    the method further comprises the following steps:
    receiving a second signal from a second terminal in the first sub-time unit; the LOS path of the second signal is a second LOS path; canceling the second signal when the second LOS path is different from the first LOS.
  6. The method of claim 5, wherein a signal received strength of the second signal is greater than or equal to a second threshold.
  7. The method of claim 5 or 6, wherein the second sub-time unit and the first sub-time unit are two sub-time units that are consecutive 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,
    a fourth angle of arrival is the same as the third angle of arrival; or,
    a difference between a fourth angle-of-arrival and the third angle-of-arrival is less than or equal to a third threshold;
    wherein the fourth angle of arrival is an angle of arrival between the first terminal and the network device in the first sub-time unit.
  8. The method of any of claims 4 to 7, wherein said receiving a first pilot signal from said first terminal in said first sub-time unit comprises:
    receiving the first pilot signal from the first terminal through a first receive beam in the first sub-time unit;
    said receiving said second pilot signal from said first terminal in said second sub-time unit comprises:
    receiving the second pilot signal from the first terminal through a second receive beam in the second sub-time unit.
  9. The method of any of claims 1 to 3, wherein the first set of pilot signals comprises third pilot signals and the second set of pilot signals comprises fourth pilot signals.
  10. A method of communication, the method comprising:
    transmitting a first set of pilot signals to a network device at a first time unit and a second set of pilot signals to the network device at a second time unit; the first time unit is different from the second time unit;
    receiving a first signal transmitted from the network device, a transmission beam of the first signal being determined from the first set of pilot signals and the second set of pilot signals.
  11. The method of claim 10, wherein the method further comprises:
    and receiving first indication information from the network equipment, wherein the first indication information is used for indicating a terminal to send the first pilot signal group and the second pilot signal group.
  12. The method of claim 10, wherein the method further comprises:
    after a pilot signal is sent to the network equipment in a third time unit, starting a timer to start timing;
    detecting that no pilot signal is sent to the network equipment before the timer finishes timing;
    the transmitting a first set of pilot signals to a network device at a first time unit and a second set of pilot signals to the network device at a second time unit includes:
    when the timer finishes timing, the first pilot signal group is sent to the network equipment in the first time unit, and the second pilot signal group is sent to the network equipment in the second time unit.
  13. The method of any of claims 10 to 12, wherein the first time unit comprises a first sub-time unit and a second sub-time unit, the first set of pilot signals comprises a first pilot signal and a second pilot signal;
    the first pilot signal group sent to the network device in the first time unit includes:
    transmitting the first pilot signal to the network device in the first sub-time unit, and transmitting the second pilot signal to the network device in the second sub-time unit.
  14. The method of claim 13, wherein said transmitting said first pilot signal to said network device in said first sub-time unit comprises:
    transmitting the first pilot signal to the network device through a first transmit beam in the first sub-time unit;
    the transmitting the second pilot signal to the network device in the second sub-time unit includes:
    and transmitting the second pilot signal to the network equipment through a second transmission beam in the second sub-time unit.
  15. The method of any of claims 10 to 12, wherein the first set of pilot signals comprises a third pilot signal; the second set of pilot signals includes a fourth pilot signal.
  16. A communications device arranged to implement a method as claimed in any one of claims 1 to 9 or arranged to implement a method as claimed in any one of claims 10 to 15.
  17. A communications apparatus comprising a processor and a memory, the memory having stored therein instructions that, when executed by the processor, cause the apparatus to perform the method of any of claims 1 to 9.
  18. A communications apparatus comprising a processor and a memory, the memory having stored therein instructions that, when executed by the processor, cause the apparatus to perform the method of any of claims 10 to 15.
  19. A computer-readable storage medium having stored thereon instructions which, when executed on a computer, cause the computer to perform the method of any of claims 1 to 9, or 10 to 15.
CN201980102034.2A 2019-11-19 2019-11-19 Communication method and device Pending CN114642017A (en)

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