Communication method, apparatus and system

Abstract

Provided in the present application are a communication method, apparatus and system, which can be applicable to the fields of cellular communications, V2X, Internet of Vehicles, autonomous driving, assisted driving, etc. The method comprises: determining a first reference signal and a first message, wherein the first reference signal is configured for determining a first beam, the first message is configured for second device discovery or for requesting communication with a second communication apparatus, the first beam is a candidate beam for communication between a first communication apparatus and the second communication apparatus, there is a first interval between time domain resources of the first reference signal and the first message, the first interval is less than or equal to a first threshold, and the first threshold is configured or predefined; and sending the first reference signal and the first message. After a receiving end determines that same is a target of a sending end, the receiving end performs beam processing, for example, beam matching, etc. If the receiving end is not the target of the sending end, no processing is performed, for example, no beam matching is executed. Therefore, unnecessary transmission and corresponding power consumption of a non-target communication apparatus are reduced.

Description

Communication method, device and system

[0001] This application claims priority to the Chinese patent application filed with the State Intellectual Property Office of China on August 11, 2023, with application number 202311021444.9 and invention name “Communication Method, Device and System”, the entire contents of which are incorporated by reference into this application. Technical Field

[0002] The present application relates to the field of communications, and in particular to a communication method, device, and system. Background Art

[0003] High-frequency spectrum bands offer abundant spectrum resources, large available bandwidth, and minimal interference. However, the corresponding losses during airborne transmission are significantly greater than those in low-frequency bands. To overcome the significant losses associated with high-frequency transmission, the industry generally adopts beam-based transmission for communication. Currently, beam matching in sidelink transmission still presents certain challenges. For example, during the beam matching process, multiple receivers, unable to determine whether they are the receivers of the transmitter, must perform beam matching, resulting in unnecessary transmission and power consumption.

[0004] Summary of the Invention

[0005] The present application provides a communication method, device, and system that can avoid unnecessary transmission and save power consumption.

[0006] In a first aspect, a communication method is provided, the method comprising: determining a first reference signal and a first message, the first reference signal being used to determine a first beam, the first message being used by a second device to discover or request communication with the second communication device, the first beam being a candidate beam for communication between the first communication device and the second communication device, there being a first interval between the time domain resources of the first reference signal and the first message, the first interval being less than or equal to a first threshold, the first threshold being configured or predefined, and sending the first reference signal and the first message.

[0007] In this method, the interval between the time domain resources of the first message and the time domain resources of the first reference signal is within a first threshold. This allows the second communication device to pre-identify the first communication device's target communication device based on the first message, facilitating the subsequent determination of whether to perform beam matching and other procedures. For example, if the second communication device is not the first communication device's target communication device, beam matching and other procedures do not need to be performed, thereby saving power consumption.

[0008] In certain implementations, the first reference signal is quasi co-located (QCL) with the first message.

[0009] In other words, the direction of the beam for sending the first reference signal is the same as the direction of the beam for sending the first message.

[0010] In some implementations, transmission resources of a first message corresponding to the first reference signal are before transmission resources of the second message, and the second message is used to indicate a reception status of the first reference signal.

[0011] In some implementations, the reception status of the first reference signal includes one or more of the following:

[0012] whether the first reference signal is received by the second communication device, or

[0013] the reception quality of the first reference signal, or

[0014] Whether the reception quality of the first reference signal exceeds a threshold, or

[0015] Whether the reception quality of the first reference signal is the highest among the received reference signals.

[0016] In this approach, the first message is sent before the second message, eliminating the need for non-target communication devices to perform beam matching and other procedures. After determining that it is the target communication device for the first communication device, it performs beam matching and then sends the second message to the first communication device, reducing unnecessary signaling overhead.

[0017] In some implementations, using the first reference signal to determine the first beam includes:

[0018] The first reference signal is used for initial beam pairing between the first communication device and the second communication device; and / or,

[0019] The first reference signal is used for beam maintenance between the first communication device and the second communication device; and / or,

[0020] The first reference signal is used for candidate beam detection between the first communication device and the second communication device; and / or,

[0021] The first reference signal is used for beam failure detection between the first communication device and the second communication device; and / or,

[0022] The first reference signal is used for beam management between the first communication device and the second communication device to determine the first beam.

[0023] Optionally, the first reference signal may be a side synchronization signal block S-SSB, or a channel state information reference signal CSI-RS and / or a demodulation reference signal DM-RS.

[0024] In some implementations, the first communication device receives a third message, wherein the third message indicates the first threshold, or the third message indicates a starting position of a time domain resource of the first message, or the third message indicates the first interval.

[0025] In certain implementations, the first reference signal is an S-SSB, and the third message is carried on the PBCH included in the S-SSB; or, the first reference signal is a CSI-RS, and the third message is carried on the control information, and the control information and the CSI-RS are sent in the same time domain resource unit.

[0026] For example, the time domain resource unit may be a time slot.

[0027] Optionally, the third message may be sent by another communication device to the first communication device, for example, another terminal device sends the third message to the first communication device. Alternatively, a network device sends the third message to the first communication device.

[0028] Optionally, the first communication device may also send the third message to other communication devices, such as other terminal devices.

[0029] In some implementations, the first threshold is determined based on at least one of the priority of the first message, the priority of the service to be transmitted indicated by the first message, or a transmission delay margin.

[0030] In certain implementations, the first reference signal is CSI-RS and / or DM-RS, and the first message and the first reference signal are carried in the same time domain resource unit; the first reference signal is S-SSB, and the first message is carried in the time domain resource unit after the time domain resource unit of the first reference signal.

[0031] In some implementations, the sending period of the first reference signal is T1, and the sending period of the first message is T2, wherein T1 is an integer multiple of T2, or T2 is an integer multiple of T1, and T1 and T2 are positive integers.

[0032] In some implementations, the first reference signal belongs to M reference signals, the first message belongs to M first messages, and M is an integer greater than or equal to 1.

[0033] Among the M reference signals, the interval between the time domain resources of two adjacent reference signals is a second interval, and the second interval is configured or predefined; and / or, among the M first messages, the interval between the time domain resources of two adjacent first messages is a third interval, and the third interval is configured or predefined.

[0034] In some implementations, the second interval is the same as the third interval.

[0035] In some implementations, the first reference signal occupies a first subset of frequency domain resources, the first message occupies a second subset of frequency domain resources, and the first subset of frequency domain resources corresponds to the second subset of frequency domain resources.

[0036] In certain implementations, the correspondence between the first frequency domain resource subset and the second frequency domain resource subset includes:

[0037] The frequency domain resource positions and sizes of the first frequency domain resource subset and the second frequency domain resource subset are the same; or,

[0038] The center frequencies of the frequency domain resources of the first frequency domain resource subset and the second frequency domain resource subset are the same, and / or the frequency domain resources of the first frequency domain resource subset and the second frequency domain resource subset are the same in size; or

[0039] The center frequencies of the frequency domain resources of the first frequency domain resource subset and the second frequency domain resource subset are the same, and the size of the first frequency domain resource subset is less than or equal to the size of the frequency domain resources of the second frequency domain resource subset, or,

[0040] The center frequencies of the frequency domain resources of the first frequency domain resource subset and the second frequency domain resource subset are the same, and the size of the second frequency domain resource subset is smaller than or equal to the size of the frequency domain resources of the first frequency domain resource subset.

[0041] In this manner, the reference signals occupy the same time domain resources and are sent in a frequency division manner, which can further save time domain resources.

[0042] In certain implementations, the first reference signal belongs to M reference signals, the first message corresponding to the first reference signal belongs to M first messages, M is an integer greater than or equal to 1, the intervals between frequency domain resource subsets of any two adjacent reference signals in the frequency domain among the M reference signals are equal, and the intervals between frequency domain resource subsets of any two adjacent first messages in the frequency domain among the M first messages are equal.

[0043] In certain implementations, the first reference signal belongs to M reference signals, the first message corresponding to the first reference signal belongs to M first messages, M is an integer greater than or equal to 1, the M reference signals also include a second reference signal, the M first messages also include a first message corresponding to the second reference signal, and there is a fourth interval between the time domain resources of the second reference signal and the first message corresponding to the second reference signal, and the fourth interval is the same as the first interval.

[0044] In certain implementations, the first reference signal belongs to M reference signals, the first message belongs to M first messages, at least two of the M first messages have different frequency domain resource subset positions and the same time domain resource positions, and at least two of the M reference signals have the same frequency domain resource subset positions and different time domain resource positions.

[0045] In this manner, the reference signal is sent in a time division manner, and the first message is sent in a frequency division manner, which can save time domain resources and improve resource utilization.

[0046] In certain implementations, the first reference signal belongs to M reference signals, the first message belongs to M first messages, at least two of the M first messages have different frequency domain resource subset positions and the same time domain resource positions, and at least two of the M reference signals have the same frequency domain resource subset position and time domain resource position and different sequences.

[0047] In this manner, the time domain resources and frequency domain resources of the multiple reference signals are the same, and the multiple reference signals are sent in a code division manner, which can further save time and frequency resources.

[0048] In some implementations, intervals between frequency domain resource subsets of any two adjacent first messages in the M first messages in the frequency domain are equal.

[0049] In certain implementations, the sequence of the first reference signal is associated with the second frequency domain resource subset; or, the first reference signal includes first indication information, and the first indication information indicates an index of the second frequency domain resource subset.

[0050] In some implementations, the index of the time domain resource of the first reference signal is associated with the index of the second frequency domain resource subset.

[0051] In certain implementations, the correspondence between the index of the time domain resource of the first reference signal and the index of the second frequency domain resource subset includes: the M reference signals include the first reference signal and the second reference signal, the index of the frequency domain resource subset of the first message is the first index, and the index of the frequency domain resource subset of the first message corresponding to the second reference signal is the second index,

[0052] The index of the time domain resource of the first reference signal is a third index, and the third index corresponds to the first index;

[0053] The index of the time domain resource of the second reference signal is a fourth index, and the fourth index corresponds to the second index.

[0054] In certain implementations, the first reference signal is associated with a data channel carrying the first message, including: a first sequence used by a demodulation reference signal in the data channel is associated with the first reference signal; and / or, bits of the first message are scrambled using a second sequence, and the second sequence is associated with the first reference signal.

[0055] In certain implementations, the first sequence is associated with the first reference signal, including: the first sequence or the second sequence is generated based on a first parameter, where the first parameter includes one or more of the following:

[0056] an index of a time domain resource of the first reference signal;

[0057] an index of a beam of the first reference signal;

[0058] the first reference signal sequence identifier;

[0059] The first reference signal includes a value indicated by control information.

[0060] In some implementations, the first sequence or the second sequence is further generated based on a source identifier and / or a destination identifier.

[0061] In certain implementations, the first sequence or the second sequence is generated based on a first parameter, including: a cyclic shift value of the first sequence or the second sequence is generated based on the first parameter; and / or a root sequence number of the first sequence or the second sequence is generated based on the first parameter.

[0062] In certain implementations, the first sequence or the second sequence is generated based on the first parameter, including: an initial value of the first sequence or the second sequence is generated based on the first parameter; and / or an initial position of the first sequence or the second sequence is generated based on the first parameter.

[0063] In some implementations, a fourth message is sent without obtaining the source identifier and / or the destination identifier, where the fourth message indicates the numerical value.

[0064] In certain implementations, the first reference signal belongs to M reference signals, the first message belongs to M first messages, the M reference signals further include a second reference signal, the second reference signal is associated with a data channel carrying the first message corresponding to the second reference signal, and the third sequence used by the demodulation reference signal in the data channel is associated with the second reference signal; and / or, the bits of the first message corresponding to the second reference signal are scrambled using a fourth sequence, the first sequence is different from the third sequence, and the second sequence is different from the fourth sequence.

[0065] In some implementations, configuration information is received, the configuration information indicating at least one of the following:

[0066] The type of the first reference signal, the first interval, the first threshold, the time-frequency resources of the first reference signal, the time-frequency resources of the first message, the sending period of the first reference signal, the number of times the first reference signal is sent, and the sending period of the first message.

[0067] In some implementations, the type of the first reference signal is S-SSB or CSI-RS.

[0068] In some implementations, a fifth message is sent, where the fifth message indicates that a first message is present within a period in which the first reference signal is sent.

[0069] In certain implementations, there is a fifth interval between the first reference signal and the time domain resource of the second message, and the fifth interval is less than or equal to a second threshold, and the second threshold is configured or predefined.

[0070] According to a second aspect, a communication method is provided, the method comprising: receiving a first reference signal and a first message, where the first message is used by a second communication device to discover or request communication with the second communication device, a first interval being present between time domain resources of the first reference signal and the first message, the first interval being less than or equal to a first threshold, the first threshold being configured or predefined;

[0071] The second communication device determines a first beam according to the first reference signal and the first message, where the first beam is a candidate beam for communication between the first communication device and the second communication device.

[0072] In certain implementations, the first reference signal is quasi co-located with the first message.

[0073] In certain implementations, it is determined whether to send a second message based on the first reference signal and the first message, where the second message is used to indicate a reception status of the first reference signal.

[0074] In some implementations, the reception status of the first reference signal includes one or more of the following:

[0075] whether the second communication device receives the first reference signal, or

[0076] the quality of the first reference signal received by the second communication device, or

[0077] whether the quality of the first reference signal received by the second communication device exceeds a threshold, or

[0078] Whether the quality of the first reference signal received by the second communication apparatus is the highest among the M reference signals received by the second communication apparatus.

[0079] In certain implementations, the first reference signal is a side synchronization signal block S-SSB, and the third message is carried on the PBCH included in the S-SSB; or, the first reference signal is a CSI-RS, and the third message is carried on the control information, and the control information and the CSI-RS are sent in the same time domain resource unit.

[0080] For example, the time domain resource unit may be a time slot.

[0081] In some implementations, the first threshold is determined based on at least one of the priority of the first message, the priority of the service to be transmitted indicated by the first message, or a transmission delay margin.

[0082] In certain implementations, the first reference signal is CSI-RS and / or DM-RS, and the first message and the first reference signal are carried in the same time domain resource unit; the first reference signal is S-SSB, and the first message is carried in the time domain resource unit after the time domain resource unit of the first reference signal.

[0083] In some implementations, the sending period of the first reference signal is T1, and the sending period of the first message is T2, wherein T1 is an integer multiple of T2, or T2 is an integer multiple of T1, and T1 and T2 are positive integers.

[0084] In some implementations, the first reference signal belongs to M reference signals, the first message belongs to M first messages, and M is an integer greater than or equal to 1.

[0085] Among the M reference signals, the interval between the time domain resources of two adjacent reference signals is a second interval, and the second interval is configured or predefined; and / or, among the M first messages, the interval between the time domain resources of two adjacent first messages is a third interval, and the third interval is configured or predefined.

[0086] In some implementations, the second interval is the same as the third interval.

[0087] In some implementations, the first reference signal occupies a first subset of frequency domain resources, the first message occupies a second subset of frequency domain resources, and the first subset of frequency domain resources corresponds to the second subset of frequency domain resources.

[0088] In certain implementations, the correspondence between the first frequency domain resource subset and the second frequency domain resource subset includes:

[0089] The frequency domain resource positions and sizes of the first frequency domain resource subset and the second frequency domain resource subset are the same; or,

[0090] The center frequencies of the frequency domain resources of the first frequency domain resource subset and the second frequency domain resource subset are the same, and / or the frequency domain resources of the first frequency domain resource subset and the second frequency domain resource subset are the same in size; or

[0091] The center frequencies of the frequency domain resources of the first frequency domain resource subset and the second frequency domain resource subset are the same, and the size of the first frequency domain resource subset is less than or equal to the size of the frequency domain resources of the second frequency domain resource subset, or,

[0092] The center frequencies of the frequency domain resources of the first frequency domain resource subset and the second frequency domain resource subset are the same, and the size of the second frequency domain resource subset is smaller than or equal to the size of the frequency domain resources of the first frequency domain resource subset.

[0093] In certain implementations, the first reference signal belongs to M reference signals, the first message corresponding to the first reference signal belongs to M first messages, M is an integer greater than or equal to 1, the intervals between frequency domain resource subsets of any two adjacent reference signals in the frequency domain among the M reference signals are equal, and the intervals between frequency domain resource subsets of any two adjacent first messages in the frequency domain among the M first messages are equal.

[0094] In certain implementations, the first reference signal belongs to M reference signals, the first message corresponding to the first reference signal belongs to M first messages, M is an integer greater than or equal to 1, the M reference signals also include a second reference signal, the M first messages also include a first message corresponding to the second reference signal, and there is a fourth interval between the time domain resources of the second reference signal and the first message corresponding to the second reference signal, and the fourth interval is the same as the first interval.

[0095] In certain implementations, the first reference signal belongs to M reference signals, the first message belongs to M first messages, at least two of the M first messages have different frequency domain resource subset positions and the same time domain resource positions, and at least two of the M reference signals have the same frequency domain resource subset positions and different time domain resource positions.

[0096] In this manner, the reference signal is sent in a time division manner and the first message is sent in a frequency division manner, which can save time domain resources and improve resource utilization.

[0097] In certain implementations, the first reference signal belongs to M reference signals, the first message belongs to M first messages, at least two of the M first messages have different frequency domain resource subset positions and the same time domain resource positions, and at least two of the M reference signals have the same frequency domain resource subset position and time domain resource position and different sequences.

[0098] That is, the reference signal is sent in a code division manner, which can further save time and frequency resources.

[0099] In some implementations, intervals between frequency domain resource subsets of any two adjacent first messages in the M first messages in the frequency domain are equal.

[0100] In certain implementations, the sequence of the first reference signal is associated with the second frequency domain resource subset; or, the first reference signal includes first indication information, and the first indication information indicates an index of the second frequency domain resource subset.

[0101] In some implementations, the index of the time domain resource of the first reference signal is associated with the index of the second frequency domain resource subset.

[0102] In certain implementations, the correspondence between the index of the time domain resource of the first reference signal and the index of the second frequency domain resource subset includes: the M reference signals include the first reference signal and the second reference signal, the index of the frequency domain resource subset of the first message is the first index, and the index of the frequency domain resource subset of the first message corresponding to the second reference signal is the second index,

[0103] The index of the time domain resource of the first reference signal is a third index, and the third index corresponds to the first index;

[0104] The index of the time domain resource of the second reference signal is a fourth index, and the fourth index corresponds to the second index.

[0105] In certain implementations, the first reference signal is associated with a data channel carrying the first message, including: a first sequence used by a demodulation reference signal in the data channel is associated with the first reference signal; and / or, bits of the first message are scrambled using a second sequence, and the second sequence is associated with the first reference signal.

[0106] In certain implementations, the first sequence is associated with the first reference signal, including: the first sequence or the second sequence is generated based on a first parameter, where the first parameter includes one or more of the following:

[0107] an index of a time domain resource of the first reference signal;

[0108] an index of a beam of the first reference signal;

[0109] the first reference signal sequence identifier;

[0110] The first reference signal includes a value indicated by control information.

[0111] In some implementations, the first sequence or the second sequence is further generated based on a source identifier and / or a destination identifier.

[0112] In certain implementations, the first sequence or the second sequence is generated based on a first parameter, including: a cyclic shift value of the first sequence or the second sequence is generated based on the first parameter; and / or a root sequence number of the first sequence or the second sequence is generated based on the first parameter.

[0113] In certain implementations, the first sequence or the second sequence is generated based on the first parameter, including: an initial value of the first sequence or the second sequence is generated based on the first parameter; and / or an initial position of the first sequence or the second sequence is generated based on the first parameter.

[0114] In certain implementations, a fourth message is received, the fourth message indicating the numerical value.

[0115] In certain implementations, the first reference signal belongs to M reference signals, the first message belongs to M first messages, the M reference signals further include a second reference signal, the second reference signal is associated with a data channel carrying the first message corresponding to the second reference signal, and the third sequence used by the demodulation reference signal in the data channel is associated with the second reference signal; and / or, the bits of the first message corresponding to the second reference signal are scrambled using a fourth sequence, the first sequence is different from the third sequence, and the second sequence is different from the fourth sequence.

[0116] In some implementations, the first reference signal is of a type of SSB or CSI-RS.

[0117] In some implementations, a fifth message is received, where the fifth message indicates that a first message is present within a period in which the first reference signal is sent.

[0118] In certain implementations, there is a fifth interval between the first reference signal and the time domain resource of the second message, and the fifth interval is less than or equal to a second threshold, and the second threshold is configured or predefined.

[0119] Regarding the beneficial effects of the second aspect, please refer to the relevant description in the first aspect and will not be repeated here.

[0120] According to a third aspect, a communication device is provided, which includes a processing module and a transceiver module. The processing module is used to determine a first reference signal and a first message, the first reference signal is used to determine a first beam, the first message is used by a second device to discover or request communication with the second communication device, the first beam is a candidate beam for communication between the first communication device and the second communication device, there is a first interval between the time domain resources of the first reference signal and the first message, the first interval is less than or equal to a first threshold, and the first threshold is configured or predefined; the transceiver module is used to send the first reference signal and the first message.

[0121] In a fourth aspect, a communication device is provided, which includes a processing module and a transceiver module. The transceiver module is used to receive a first reference signal and a first message, where the first message is used by a second communication device to discover or request communication with the second communication device. There is a first interval between the time domain resources of the first reference signal and the first message, and the first interval is less than or equal to a first threshold, which is configured or predefined; the processing module is used to determine a first beam based on the first reference signal and the first message, where the first beam is a candidate beam for communication between the first communication device and the second communication device.

[0122] Optionally, the processing module is further configured to determine whether to send a second message based on the first reference signal and the first message, wherein the second message is configured to indicate a reception status of the first reference signal.

[0123] In a fifth aspect, a computer-readable medium is provided, which stores a program code for execution by a communication device, wherein the program code includes instructions for executing the method of the first aspect, or any possible implementation of the first aspect, or all possible implementations of the first aspect.

[0124] In a sixth aspect, a computer-readable medium is provided, which stores a program code for execution by a communication device, wherein the program code includes instructions for executing the method of the second aspect, or any possible implementation of the second aspect, or all possible implementations of the second aspect.

[0125] In the seventh aspect, a computer program product comprising instructions is provided, which, when executed on a computer, enables the computer to execute the method of the above-mentioned first aspect, or any possible implementation of the first aspect, or all possible implementations of the first aspect.

[0126] In an eighth aspect, a computer program product comprising instructions is provided, which, when executed on a computer, enables the computer to execute the method of the above-mentioned second aspect, or any possible implementation of the second aspect, or all possible implementations of the second aspect.

[0127] In the ninth aspect, a communication system is provided, which includes a device having a method for implementing the above-mentioned first to second aspects, or any possible implementation method of the first to second aspects, or all possible implementation methods of the first to second aspects, and various possible design functions.

[0128] In a tenth aspect, a processor is provided, configured to execute the method of the above-mentioned first aspect, or any possible implementation of the first aspect, or all possible implementations of the first aspect.

[0129] In one possible embodiment, the processor is configured to be coupled to a memory.

[0130] In the eleventh aspect, a processor is provided, configured to execute the method of the above-mentioned second aspect, or any possible implementation of the second aspect, or all possible implementations of the second aspect.

[0131] In one possible embodiment, the processor is configured to be coupled to a memory.

[0132] In the twelfth aspect, a chip is provided, the chip including a processor, the processor being used to implement the above-mentioned first aspect, or any possible implementation method of the first aspect, or, or all possible implementation methods of the first aspect.

[0133] In one possible embodiment, the chip further includes a communication interface, which is used to communicate with an external device or an internal device.

[0134] Optionally, the chip may further include a memory storing instructions, and the processor is configured to execute the instructions stored in the memory or instructions derived from other sources. When the instructions are executed, the processor is configured to implement the method of the first aspect, or any possible implementation of the first aspect, or all possible implementations of the first aspect.

[0135] Optionally, the chip may be integrated into a terminal device and / or a network device.

[0136] In the thirteenth aspect, a chip is provided, which includes a processor configured to execute the method of the second aspect, or any possible implementation of the second aspect, or all possible implementations of the second aspect.

[0137] In one possible embodiment, the chip further includes the communication interface, which is used to communicate with an external device or an internal device.

[0138] Optionally, the chip may further include a memory storing instructions, and the processor is configured to execute the instructions stored in the memory or instructions derived from other sources. When the instructions are executed, the processor is configured to implement the second aspect, or any possible implementation of the second aspect, or all possible implementations of the second aspect.

[0139] Optionally, the chip may be integrated into a terminal device and / or a network device. BRIEF DESCRIPTION OF THE DRAWINGS

[0140] FIG. 1A and FIG. 1B are schematic diagrams of a wireless communication system applicable to an embodiment of the present application.

[0141] FIG2 is a schematic diagram of establishing communication between UEs.

[0142] FIG3 is a schematic diagram of an information transmission method 300 provided in an embodiment of the present application.

[0143] FIG4 is a schematic diagram of time domain resources of a first message and a reference signal.

[0144] FIG5 is a schematic diagram of frequency domain resources of yet another reference signal and a first message.

[0145] FIG6 is a schematic diagram of yet another reference signal and time-frequency resources of a first message.

[0146] FIG7 is a schematic diagram of yet another reference signal and time-frequency resources of a first message.

[0147] FIG8 is a schematic diagram of a second message, a first reference signal, and time-frequency resources of the first message.

[0148] FIG9 is a schematic diagram of yet another time-frequency resource of a second message, a first message, and a reference signal.

[0149] FIG10 is a schematic block diagram of a communication device 1000 provided in an embodiment of the present application.

[0150] FIG11 is a schematic block diagram of a communication device 1100 provided in an embodiment of the present application.

[0151] FIG12 is a schematic block diagram of a chip system 1200 provided in an embodiment of the present application. DETAILED DESCRIPTION

[0152] The technical solutions in the embodiments of the present application will be described below with reference to the accompanying drawings.

[0153] The technical solutions provided in this application can be applied to various communication systems, such as: fifth generation (5G) or new radio (NR) systems, long term evolution (LTE) systems, LTE frequency division duplex (FDD) systems, LTE time division duplex (TDD) systems, etc. The technical solutions provided in this application can also be applied to future communication systems, such as sixth generation (6G) mobile communication systems. The technical solutions provided in this application can also be applied to device to device (D2D) communication, vehicle-to-everything (V2X) communication, machine to machine (M2M) communication, machine type communication (MTC), and Internet of Things (IoT) communication systems or other communication systems.

[0154] As an example, V2X communication may include: vehicle-to-vehicle (V2V) communication, vehicle-to-roadside infrastructure (V2I) communication, vehicle-to-pedestrian (V2P) communication, and vehicle-to-network (V2N) communication. V2V refers to communication between vehicles. V2P refers to communication between vehicles and people (including pedestrians, cyclists, drivers, or passengers, etc.). V2I refers to communication between vehicles and infrastructure, such as road side units (RSU) or network equipment. Among them, RSU includes two types: terminal-type RSU, which is in a non-mobile state because it is located on the roadside and does not need to consider mobility; base station-type RSU, which can provide timing synchronization and resource scheduling to vehicles communicating with it. V2N refers to communication between vehicles and network equipment. It can be understood that the above is an exemplary description and the embodiments of the present application are not limiting. For example, V2X can also include the current 3GPP Rel-16 and subsequent versions of V2X communications based on the NR system.

[0155] The terminal device in the embodiments of the present application may also be referred to as user equipment (UE), access terminal, user unit, user station, mobile station, mobile station, remote station, remote terminal, mobile device, user terminal, terminal, wireless communication device, user agent or user device.

[0156] A terminal device can be a device that provides voice / data to a user, such as a handheld device or vehicle-mounted device with wireless connection capabilities. A terminal device may include a user equipment (UE), sometimes also referred to as a terminal, access station, UE station, remote station, wireless communication device, or user device. The terminal device is used to connect people, objects, machines, etc. and can be widely used in various scenarios, such as but not limited to the following scenarios: cellular communications, D2D, V2X, machine-to-machine / machine-type communications (M2M / MTC), Internet of Things (IoT), virtual reality (VR), augmented reality (AR), industrial control, self-driving, remote medical, smart grid, smart furniture, smart office, smart wearable, smart transportation, smart city, drones, robots, and other scenarios. For example, the terminal device can be a mobile phone, a tablet computer, a computer with wireless transceiver function, a VR terminal, an AR terminal, a wireless terminal in industrial control, a whole vehicle, a wireless communication module in the whole vehicle, a vehicle-mounted T-box (Telematics BOX), a roadside unit RSU, a wireless terminal in unmanned driving, a smart speaker in an IoT network, a wireless terminal device in telemedicine, a wireless terminal device in a smart grid, a wireless terminal device in transportation safety, a wireless terminal device in a smart city, or a wireless terminal device in a smart home, etc. The embodiments of the present application are not limited to this.

[0157] By way of example and not limitation, in the embodiments of the present application, the terminal device may also be a wearable device. Wearable devices, also known as wearable smart devices, are a general term for wearable devices developed by applying wearable technology to intelligently design everyday wearables, such as glasses, gloves, watches, clothing, and shoes. A wearable device is a portable device that is worn directly on the body or integrated into the user's clothing or accessories. Wearable devices are not merely hardware devices; they achieve powerful functionality through software support, data interaction, and cloud interaction. Broadly speaking, wearable smart devices include devices that are fully functional, large in size, and can function completely or partially without relying on a smartphone, such as smart watches or smart glasses, as well as devices that focus on a specific application function and require integration with other devices such as smartphones, such as various smart bracelets and smart jewelry for vital sign measurement. Furthermore, in the embodiments of the present application, the terminal device may also be a terminal device in an IoT system. IoT is an important component of the future development of information technology. Its main technical feature is to connect objects to the network through communication technologies, thereby realizing an intelligent network that interconnects people and machines and things and things.

[0158] The various terminal devices described above, if located on a vehicle (e.g., placed in a vehicle or installed in a vehicle), can be considered as vehicle-mounted terminal devices, which are also referred to as on-board units (OBUs). The terminal device of the present application can also be an on-board module, on-board module, on-board component, on-board chip, or on-board unit built into a vehicle as one or more components or units, and the vehicle can implement the method of the present application through the built-in on-board module, on-board module, on-board component, on-board chip, or on-board unit.

[0159] It should be understood that the network device in the wireless communication system may be a device that can communicate with the terminal device. The network device may also be referred to as an access network device or a radio access network device. For example, the network device may be a base station. The network device in the embodiment of the present application may refer to a radio access network (RAN) node (or device) that connects the terminal device to the wireless network. A base station may broadly cover various names as follows, or be replaced with the following names, such as: NodeB, evolved NodeB (eNB), next generation NodeB (gNB), relay station, access point, transmitting and receiving point (TRP), transmitting point (TP), master eNodeB (MeNB), secondary eNodeB (SeNB), multi-standard radio (MSR) node, home base station, network controller, access node, wireless node, access point (AP), transmission node, transceiver node, baseband unit (BBU), remote radio unit (RRU), active antenna unit (AAU), remote radio head (RRH), central unit (CU), distributed unit (DU), positioning node, etc. A base station may be a macro base station, a micro base station, a relay node, a donor node, or the like, or a combination thereof. A base station may also refer to a communication module, modem, or chip used to be set in the aforementioned equipment or device. A base station may also be a mobile switching center and a device that performs base station functions in D2D, V2X, and M2M communications, a network-side device in a 6G network, or a device that performs base station functions in future communication systems. A base station may support networks with the same or different access technologies. The embodiments of this application do not limit the specific technology and specific device form used by the network device.

[0160] Base stations can be fixed or mobile. For example, a helicopter or drone can be configured to act as a mobile base station, and one or more cells can move based on the location of the mobile base station. In other examples, a helicopter or drone can be configured to act as a device that communicates with another base station.

[0161] In some deployments, the network device mentioned in the embodiments of the present application may be a device including a CU, or a DU, or a device including a CU and a DU, or a control plane CU node (central unit control plane (central unit-control plane, CU-CP)) and a user plane CU node (central unit user plane (central unit-user plane, CU-UP)) and a DU node.

[0162] In the embodiments of the present application, the device for implementing the function of the network device can be a network device, or a device capable of supporting the network device to implement the function, such as a chip system or chip, which can be installed in the network device. In the embodiments of the present application, the chip system can be composed of a chip, or can include a chip and other discrete devices.

[0163] The network device and terminal device can be deployed on land, including indoors or outdoors, handheld or vehicle-mounted; can also be deployed on the water; can also be deployed in the air on aircraft, balloons, and satellites. The embodiments of this application do not limit the scenarios in which the network device and terminal device are located.

[0164] First, a communication system applicable to an embodiment of the present application is briefly introduced with reference to FIG. 1A and FIG. 1B as follows.

[0165] Figures 1A and 1B are schematic diagrams of a wireless communication system applicable to an embodiment of the present application. As shown in Figures 1A and 1B, the wireless communication system may include at least one terminal device, such as UE1, UE2, UE3, UE4, and UE5. Optionally, the wireless communication system may also include at least one network device, such as the network device shown in the figure.

[0166] The network device and the terminal device can communicate with each other. If the network device and the terminal device can communicate with each other through the Uu interface, the link for communication between the network device and the terminal device can be recorded as a Uu link. As shown in Figure 1A(a) or Figure 1B(a), the network device and UE1 can communicate directly, and as shown in Figure 1A(b) or Figure 1B(b), the network device and UE1 can also communicate through UE2; similarly, the network device and UE2 can communicate directly, and the network device and UE2 can also communicate through UE1. It can be understood that the Uu link represents a connection relationship between the terminal device and the network device, which is a logical concept, not a physical entity. The main link is only a name for distinction, and its specific name does not limit the scope of protection of this application.

[0167] Terminal devices can also communicate with each other. For example, terminal devices can communicate directly with each other, as shown in Figures 1A(a) to (c) and 1B(a) to (c), UE1 and UE2 can communicate directly. For another example, terminal devices can communicate with each other through other devices, such as network devices or terminal devices. As shown in Figure 1A(a), UE1 and UE2 can communicate through a network device, and as shown in Figures 1A(d) and 1B(d), UE1 and UE2 can communicate through UE3. The interface for communication between terminal devices can be recorded as a proximity-based services communication 5 (PC5) interface, the multi-link for communication between terminal devices can be recorded as a sidelink (SL), and the communication between terminal devices can also be recorded as SL communication. The sidelink can also be called an edge link or a side link, etc. It can be understood that the sidelink represents a connection relationship between terminal devices and terminal devices, and is a logical concept rather than a physical entity. The side link is named only for distinction, and its specific name does not limit the scope of protection of this application.

[0168] Unicast communication can be performed between devices, such as between terminal devices. Unicast refers to a unicast connection pair consisting of a sending terminal and a receiving terminal. For example, in Figure 1A, UE1 and UE2 can perform unicast communication.

[0169] Multicast communication can be performed between devices, such as multicast communication can be performed between terminal devices. Multicast means that a sending terminal and at least one receiving terminal form a multicast connection pair. For example, taking Figure 1B as an example, multicast communication can be performed between UE1 and UE2, UE4 and UE5. As shown in (a) in Figure 1B, the network device and UE1 can communicate directly, and one UE1 can perform multicast communication with multiple UEs, such as UE2, UE4 and UE5. When UE1 performs multicast communication with multiple UEs, it can be performed under network coverage, as shown in (a) or (b) in Figure 1B, or it can be performed without network coverage, as shown in (c) or (d) in Figure 1B. It can be understood that Figure 1B uses the example of UE1 performing multicast communication with three UEs for illustrative purposes, and there is no limitation to this. For example, UE1 can perform multicast communication with a larger number of UEs.

[0170] As an example, SL communication between terminal devices can be used in the Internet of Vehicles or intelligent transportation system (ITS), such as the V2X communication mentioned above.

[0171] Optionally, SL communication between terminal devices can be performed under network coverage or without network coverage. As shown in Figures 1A(a) to (b) and 1B(a) to (b), UE1 and other UEs can communicate under network coverage; or, as shown in Figures 1A(c) to (d) and 1B(c) to (d), UE1 and other UEs can communicate out of network coverage (out-of-coverage).

[0172] Optionally, the configuration information during SL communication between terminal devices, such as the time-frequency resources during SL communication between terminal devices, can be configured or scheduled by the network device, or can be independently selected by the terminal device without restriction.

[0173] It is understood that Figures 1A and 1B are simplified schematic diagrams for ease of understanding, and the wireless communication system may also include other network devices or other terminal devices, which are not shown in Figures 1A and 1B. The embodiments of the present application can be applied to any communication scenario in which a transmitting device and a receiving device communicate.

[0174] To facilitate understanding of the embodiments of the present application, several terms involved in the present application are briefly introduced below.

[0175] 1. Time-frequency resources

[0176] In this application, data or information can be carried by time-frequency resources, which can also be called transmission resources.

[0177] In the time domain, time-frequency resources may include one or more time domain units (or time units). A time domain unit may be a symbol, a mini-slot, a slot, a partial slot, a subframe, or a radio frame, etc.

[0178] In the frequency domain, time-frequency resources can include one or more frequency domain units. A frequency domain unit can be a resource element (RE), a resource block (RB), a subchannel, a subband, a resource pool, a bandwidth, a bandwidth part (BWP), a carrier, a channel, or an interlace RB, etc.

[0179] In this application, as an example, a time slot is the most basic time-domain resource unit for a single transmission. Optionally, a time slot includes: a full time slot, a mini-time slot, a partial time slot, or a sub-time slot consisting of one or more OFDM symbols. Optionally, a time slot can also be a collection of one or more symbols. For example, a time slot can also include a collection of one or more OFDM symbols, for example, the number of the one or more OFDM symbols can be 1, 2, 3, 4, 6, 7, 12, or 14.

[0180] In addition, the duration of a time slot can be related to the subcarrier spacing. For example, when the subcarrier spacing is 15kHz, the duration of a time slot is 1 millisecond (ms); when the subcarrier spacing is 30kHz, the duration of a time slot is 0.5ms; when the subcarrier spacing is 60kHz, the duration of a time slot is 0.25ms. Similarly, when the subcarrier spacing is 15*2 μ When the time slot is 2 -μ ms, μ=0,1,2,…and other integers.

[0181] For ease of description, the time slot referred to in this application may include any of a time slot, a mini time slot, a partial time slot, and a full time slot. The frequency domain resource referred to in this application may be a frequency domain resource subset, which may include the above-mentioned one or more frequency domain units.

[0182] 2. Priority:

[0183] The terminal may send multiple services at the same time, and the priorities of the multiple services may be different. Therefore, the priority of the UE can also be described as the service priority of the UE. The service priority of the terminal is specifically the transmission priority of the UE.

[0184] Service priority, also known as L1 priority, physical layer priority, priority carried in sidelink control information (SCI), priority corresponding to the physical side link share channel (PSSCH) associated with the SCI, transmission priority, priority for sending PSSCH, priority for resource selection, priority of logical channel, and the highest level of priority of logical channel.

[0185] The priority levels and priority values ​​may have a certain correspondence, for example, a higher priority level corresponds to a lower priority value, and vice versa. For example, a higher priority level corresponds to a lower priority value. The priority value range may be an integer from 1 to 8 or an integer from 0 to 7. If the priority value range is 1 to 8, a priority value of 1 represents the highest priority level.

[0186] 3. Terminal device communication identification:

[0187] The identifier of the terminal device communication refers to the identifier used to indicate, identify or correspond to the corresponding terminal device during the communication process. For example, the terminal device can be an index or number used to uniquely identify the terminal device. This identifier can be signaling configured, pre-configured, or predefined. As an example, the identifier of the terminal device is any of the following: the terminal's medium access control (MAC) address, the subscriber identity module (SIM) card number, the international mobile equipment identity (IMEI), etc.

[0188] Optionally, the identifier of the terminal device communication can also be an identifier used to indicate, identify or correspond to the corresponding terminal device during transmission. This identifier can be signaling configuration, pre-configured, or predefined. For example: IP address, radio network temporary identifier (RNTI), source identifier of the sending device, destination identifier of the receiving device. Optionally, the source identifier of the sending device can be an identifier associated with a specific service or message to be sent, such as an identifier used to identify the transmitting terminal during the transmission process. This identifier can be determined by the service and can be used for unicast, multicast or broadcast. A transmitting terminal can have multiple sidelink links, and therefore can have multiple different source identifiers. Optionally, the destination identifier of the receiving device can be an identifier associated with a specific service or message to be received, used to identify the receiving UE during the transmission process. This identifier can be determined by the service and can be used for unicast, multicast or broadcast. A receiving UE can have multiple sidelink links, and therefore can have multiple different destination identifiers.

[0189] 4. Discovery message: In NR sidelink, the discovery message is carried in the PSSCH channel and is used to indicate the information of the transmitting UE itself, or the information of the target UE to be found, thereby realizing the process of surrounding UEs discovering each other before communication.

[0190] 5. Direct Communication Request (DCR): A message used to request communication before unicast communication. This message may include the following information: the target UE's layer 2 identifier; IP-related capabilities and information; source UE information; target UE's application layer identifier; service information; security information, etc.

[0191] 6. Direct Communication Accept (DCA): Indication information for receiving a communication request, including source user information, quality of service (QoS) information, IP address information, etc. Optionally, the source user information includes the application layer identifier, source identifier, or layer 2 identifier of the DCA message sender.

[0192] 7. Beam Management: 5G NR can support very high data rates and lower latency. Its frequency bands include FR1 and FR2. FR1 is below 6 GHz or below 7.125 GHz, ranging from 450 to 6000 MHz; while FR2 is the millimeter wave band (from 24.25 GHz to 52.6 GHz).

[0193] Due to the high frequency of the millimeter wave band, propagation losses are high. To compensate for these losses, directional communication is essential at these frequencies. However, the relatively small wavelength due to the high frequency makes antenna arrays with a large number of antenna elements possible. This provides beamforming gain to the RF link budget, helping to compensate for propagation losses. Furthermore, large antenna arrays facilitate higher data rates due to spatial multiplexing techniques. These directional links require precise alignment of the transmit and receive beams. To achieve beam alignment and meet the required end-to-end latency, beam management operations are introduced in 5G NR.

[0194] The main purpose of beam management is to obtain and maintain a set of optimal TRxPs (transmission / reception points) and UE beams that can be used for DL ​​and UL transmission / reception.

[0195] In the 5G NR beam management process, the following operations are mainly performed: beam scanning, beam maintenance, beam measurement, beam selection, beam reporting and beam recovery.

[0196] Beam scanning: refers to covering a spatial area with a set of transmitted and received beams at pre-specified time intervals and directions.

[0197] Beam measurement: This refers to the evaluation of the received signal quality at the gNB or UE. Different metrics can be used for this purpose, such as reference signal receiving power (RSRP), reference signal receiving quality (RSRQ), or signal to interference plus noise ratio (SINR).

[0198] Beam selection: This involves selecting one or more appropriate beams at the gNB or UE based on the beam measurement results. Beam scanning is used to select and align the transmit beam at the transmitter and the receive beam at the receiver, a process known as beam matching or beam pairing.

[0199] Beam maintenance: This involves tracking, locking, or fine-tuning the beam currently used for communication through gNB or UE measurement results to achieve stable communication quality.

[0200] Beam recovery: refers to the process of restoring communication by searching or identifying an available beam among candidate beams when the currently used beam is mismatched, interrupted, or the signal quality is significantly degraded.

[0201] 8. Quasi Co-located (QCL)

[0202] If the large-scale properties of the channel experienced by symbols on one antenna port can be inferred from the channel experienced by symbols on another antenna port, the two antenna ports are considered to be quasi-co-located. Large-scale properties include delay spread, Doppler spread, Doppler shift, average gain, average delay, and spatial Rx parameters.

[0203] 9. Synchronization signal (SS) / synchronization signal block (SSB)

[0204] The synchronization signal is a signal used to establish time and frequency synchronization between synchronization signal transceivers. Optionally, the synchronization signal may include a master synchronization signal and a slave synchronization signal. Optionally, when physical broadcast information is also sent together with the synchronization signal, the synchronization signal is also called a synchronization signal block SSB (SS Block). Optionally, the synchronization signal or synchronization signal block can be used for a cellular link, a relay link or a sidelink. In the sidelink, SSB can also be expressed as S-SSB (Sidelink SSB). Optionally, the synchronization signal can be sent once, or it can be sent for a period of time at a certain period, or it can be sent periodically at a certain period.

[0205] In the present application, the side synchronization signal block may be an S-SSB. The S-SSB includes a primary synchronization signal S-PSS, a secondary synchronization signal S-SSS, and a side broadcast channel PSBCH. Optionally, the S-SSB may be referred to as a synchronization signal, a side synchronization signal, or a side signal, etc. The above names are only examples and should not constitute any limitation on the technical solution of the present application. It should be understood that the S-SSB may be composed of a predetermined number of symbols in the time domain and occupy a preset bandwidth in the frequency domain. For example, the S-SSB includes 4 symbols in the time domain and occupies 20 PRBs in the frequency domain. For another example, the S-SSB includes 13 or 11 symbols in the time domain and occupies 11 PRBs in the frequency domain. The S-SSB may include AGC symbols and / or null symbols in the time domain, or may not include them. This application does not impose any restrictions on this.

[0206] The above briefly explains the terms involved in this application, which will not be repeated in the following embodiments. In addition, the above explanation of the terms is only for ease of understanding and does not limit the scope of protection of the embodiments of this application.

[0207] It should be understood that the term "and / or" in this document simply describes an association between related objects, indicating that three possible relationships exist. For example, "A and / or B" can represent: A exists alone, A and B exist simultaneously, or B exists alone. Furthermore, the character " / " in this document generally indicates that the related objects are in an "or" relationship.

[0208] It can also be understood that the information indicated by the indication information is called the information to be indicated. In the specific implementation process, there are many ways to indicate the information to be indicated, such as but not limited to, directly indicating the information to be indicated, such as the information to be indicated itself or the index of the information to be indicated. The information to be indicated can also be indirectly indicated by indicating other information, wherein there is an association between the other information and the information to be indicated. It is also possible to indicate only a part of the information to be indicated, while the other parts of the information to be indicated are known or agreed in advance. For example, the indication of specific information can also be achieved with the help of the arrangement order of each information agreed in advance (such as specified in the protocol), thereby reducing the indication overhead to a certain extent.

[0209] In NR D2D communication, when UE-1 initiates a direct communication (sidelink) request, it must first find the target UE-2 through a discovery message before initiating a communication request to UE-2. In V2X scenarios, UE-1 first initiates a direct (sidelink) communication request to UE-2, then establishes security and then responds with a direct communication response, thus implementing unicast-based V2X services.

[0210] However, during the initial beam matching or pairing process, UE-1 originally intended to conduct unicast communication with UE-2. However, before the beams are successfully paired, UE-1 does not know which UE is UE-2, nor does it know whether UE-2 is near UE-1. Currently, UE-1 initiates a beam pairing request before finding UE-2. As shown in Figure 2, UE-2 through UE-5 each respond to UE-1's beam pairing request and complete beam pairing with UE-2. After beam pairing is completed, UE-1 initiates a DCR to UE-2 through UE-5. After UE-2 through UE-5 confirm that they are UE-1's target receiving UEs, they send a DCA to UE-1 accordingly. Among them, UE-3, UE-4, and UE-5, because they do not know whether they are UE-1's receiving UEs, perform unnecessary beam pairing, resulting in corresponding power consumption and waste of spectrum resources.

[0211] In view of this, the present application proposes a communication method, which can avoid unnecessary pairing of beam requests and save power consumption.

[0212] The following will describe in detail the information transmission method provided by the embodiments of the present application in conjunction with the accompanying drawings. The embodiments provided by the present application can be applied to any communication scenario in which a transmitting device and a receiving device communicate, such as the communication system shown in Figures 1A and 1B above.

[0213] As shown in FIG3 , the method 300 includes the following steps:

[0214] 310. A first communication device determines a first reference signal and a first message.

[0215] Optionally, the first reference signal is a beam management reference signal (BM-RS). The beam management reference signal can be divided into different types. For example, the first reference signal may be a sidelink synchronization signal block (S-SSB), that is, S-SSB is a first type of beam management reference signal. Alternatively, the first reference signal may be a channel state information reference signal (CSI-RS) and / or a demodulation reference signal (DM-RS), that is, CSI-RS and / or DM-RS are second type of beam management reference signals. Alternatively, the first reference signal may be a random access reference signal, that is, the random access reference signal is a third type of beam management reference signal. Alternatively, the first reference signal may be a reference signal for transmitting feedback information, that is, the reference signal for transmitting feedback information is a fourth type of beam management reference signal.

[0216] The first reference signal is used to determine a first beam, which is a candidate beam for communication between the first communication device and the second communication device.

[0217] The second communication device may be a receiving device of the first reference signal. Alternatively, the second communication device may be the target device of the first communication device. For example, the second communication device may be the device with which the first communication device determines to communicate. Alternatively, the second communication device may be a receiving device of data to be transmitted by the first communication device.

[0218] Alternatively, the second communication device may be a terminal device. The first communication device may also be a terminal device. In other words, if the first communication device establishes communication with the second communication device, the communication between the first communication device and the second communication device is sideline communication.

[0219] That is, the first reference signal can be used to determine the beam used for communication between the transmitter and receiver in the sideline communication.

[0220] The first beam is a candidate beam for communication between the first and second communications devices. For example, the first and second communications devices complete beam pairing using a first reference signal and determine that Beam A can be used for communication between the first and second communications devices. Beam A is the candidate beam. When establishing communication, the first and second communications devices can select Beam A for communication or another beam, such as a beam with a similar beam direction to Beam A.

[0221] For example, the first reference signal may determine the first beam by one or more of the following implementations:

[0222] Implementation 1: The first reference signal is used for initial beam matching between the first communication device and the second communication device.

[0223] Implementation 2: The first reference signal is used for beam maintenance between the first communication device and the second communication device.

[0224] Implementation 3: The first reference signal is used for candidate beam detection between the first communication device and the second communication device.

[0225] Implementation 4: The first reference signal is used for beam failure detection between the first communication device and the second communication device.

[0226] Implementation 5: The first reference signal is used for beam management between the first communication device and the second communication device.

[0227] The first message is used by the second communication device to discover or request communication with the second communication device.

[0228] For example, the first message may be used by a first communication device to discover a second communication device, or the first message may be used by a second communication device to discover the first communication device, or the first message may be used by the first communication device and the second communication device to discover each other. For example, the first message may be a discovery message.

[0229] Optionally, in the present application, the resource for transmitting the first message may be configured by signaling, preconfigured, or predefined. Optionally, the resource for transmitting the first message may be configured outside the resource pool or within the resource pool.

[0230] The first message is used to request communication with the second communication device, and may be used by the first communication device to request direct communication with the second communication device, such as sideline communication. For example, the first message may be a DCR.

[0231] Optionally, the first message may carry information of the first communication device (i.e., source identifier), such as the identifier of the first communication device, or the service identifier corresponding to the data to be sent by the first communication device. The first message may also carry information of the second communication device (i.e., destination identifier), such as the identifier of the second communication device.

[0232] In one possible implementation, the first reference signal corresponds to the first message. For example, a first interval exists between the time domain resources of the first reference signal and the first message, i.e., the first reference signal and the first message are separated in the time domain by the first interval. For example, the time interval between the start time (or end time) of the resource containing the first reference signal and the start time (or end time) of the resource containing the first message is the first interval. The first interval is less than or equal to a first threshold, which can be configured by signaling, preconfigured, or predefined, and is not limited thereto.

[0233] In another possible implementation, the first message and the first reference signal are quasi-co-located.

[0234] 320. The first communication device sends a first reference signal and a first message to the second communication device. Correspondingly, the second communication device receives the first reference signal and the first message.

[0235] For example, an interval between a time domain resource for receiving the first reference signal by the second communications apparatus and a time domain resource for receiving the first message is less than or equal to a first threshold.

[0236] 330. The second communication device determines a first beam according to the first reference signal and the first message.

[0237] Optionally, this embodiment further includes 340, where the second communication device determines, according to the first reference signal and the first message, whether to send a second message.

[0238] The second message indicates a reception status of the first reference signal. The reception status of the first reference signal is one or more of the following:

[0239] whether the second communication device receives the first reference signal, or

[0240] the quality of the first reference signal received by the second communication device, or

[0241] whether the quality of the first reference signal received by the second communication device exceeds a threshold, or

[0242] Whether the quality of the first reference signal received by the second communication device is the highest or higher among the reference signals received by the second communication device. Optionally, higher means: the second communication device receives M reference signals, among which M1 reference signals have the best signal quality, and any one of the M1 reference signals is higher.

[0243] The quality of the first reference signal may be represented by one or more parameters such as RSRP, RSRQ, received signal strength indication (RSSI), channel quality indicator (CQI), signal to noise ratio (SNR) or SINR.

[0244] The threshold may be signaling-configured, preconfigured, or predefined, and is not limited thereto. When the quality of the reference signal is greater than or equal to the threshold, the beam corresponding to the reference signal may be used for communication. In other words, the beam corresponding to the reference signal or a beam, physical channel, or physical signal with the same quality as the reference signal may be used as a candidate beam.

[0245] For example, the second communications device may receive multiple reference signals. For example, if the second communications device receives reference signal #A with a quality of 1, reference signal #B with a quality of 2, and reference signal #C with a quality of 3, the second communications device may determine that reference signal #C has the highest quality and reference signal #B has a relatively high quality. The beam corresponding to the reference signal with the highest quality or the relatively high quality reference signal may be used for communication, or may be used as a candidate beam.

[0246] In one possible implementation, the time domain resource of the second message is later than the time domain resource of the first message. In other words, the second communication device determines whether to send the second message after receiving the first message. The specific implementation is as follows:

[0247] Implementation 1: The second communication device determines that it is the target device of the first communication device, and sends a second message to the first communication device.

[0248] Implementation 2: The second communication device determines that it is not the target device of the first communication device and does not send the second message to the first communication device.

[0249] Based on this, the second communication device can detect the first message on a time domain resource that is after the first interval from the time domain resource of the first reference signal to determine whether it is the target device of the first communication device, or in other words, determine whether it is the target receiving device of the data to be transmitted by the first communication device. It further determines whether to send the second message. When the second communication device is not the target device of the first communication device, the second communication device does not need to perform beam management (or beam matching), avoiding unnecessary information transmission, such as not having to send the second message, and at the same time reducing the power consumption of the second communication device.

[0250] The following describes in detail the solution of the embodiment shown in method 300 in combination with several aspects.

[0251] Aspect 1: First reference signal.

[0252] In a possible implementation, the first reference signal belongs to M reference signals. The M reference signals may be reference signals sent in the same period.

[0253] For example, the M reference signals are identical and are all sent in one transmission cycle. The M reference signals being identical includes using the same sequence and / or the same beam direction or being in QCL with each other. In other words, the reference signal is sent M times in one transmission cycle, and the first reference signal is one of the M reference signals, or the first reference signal is a reference signal sent during one of the M transmissions.

[0254] For example, each of the M reference signals is different or at least two of them are different, and the M reference signals are all sent in one transmission cycle. The at least two of the M reference signals are different, including: at least two of the M reference signals use different sequences, and / or at least two of the M reference signals use different or non-QCL beam directions. In other words, M reference signals are sent in one transmission cycle, and the first reference signal is one of the M reference signals, or the first reference signal is a reference signal sent once among the M reference signals.

[0255] That is, the first communication device sends M reference signals to the second communication device.

[0256] For example, the transmission period is T1. The value of T1, or the duration of the transmission period of the M reference signals, can be configured by signaling, preconfigured, or predefined, and is not limited thereto. Specifically, the value of T1 can be, for example, 1 ms, 2 ms, 4 ms, 5 ms, 10 ms, 20 ms, 40 ms, 50 ms, 80 ms, 100 ms, 160 ms, etc.

[0257] The time domain position of the first reference signal within the transmission period can be determined by an offset value. The offset value is the time domain offset of the first reference signal relative to the start position of the period (such as the offset in FIG4 ). Alternatively, the offset is the time domain offset of the first reference signal relative to the time domain position of the first reference signal within the period. Optionally, the offset is less than the transmission period T1. Optionally, the offset value is 0.

[0258] Among the M reference signals, the interval between the time domain resources of two adjacent reference signals (ie, the second interval) may be configured by signaling, pre-configured, or pre-defined, and is not limited thereto.

[0259] For example, M is set to 3, and the three reference signals include reference signal #A, reference signal #B, and reference signal #C. The interval between the time domain resource of reference signal #A and the time domain resource of reference signal #B is the second interval, and the interval between reference signal #B and reference signal #C is also the second interval. Optionally, the value of the second interval is less than the transmission period T1.

[0260] That is, among the M reference signals, the interval between the time domain resources of any two adjacent reference signals is the same. Among them, adjacent reference signals can be understood as two reference signals without any other reference signals in between. For example, if there is no other reference signal between reference signal #A and reference signal #B, then reference signal #A and reference signal #B are adjacent reference signals. Or, two reference signals with an index value difference of 1. For example, the index of reference signal #A is 1 and the index of reference signal #B is 2, then reference signal #A and reference signal #B are adjacent reference signals. It should be understood that the index can be the index of the reference signal in the M reference signals, or the index of the time domain resource corresponding to a reference signal, such as the index of the time domain resource corresponding to a reference signal in the time domain resources corresponding to the M reference signals.

[0261] Aspect 2: First News

[0262] The time domain resources of the first message and the time domain resources of the first reference signal may be in the same time domain resource unit, which may be a time slot. For example, the first message and the first reference signal may be in the same time slot or in different time slots.

[0263] For example, when the first reference signal is a CSI-RS and / or a DM-RS, the first message and the first reference signal may be located in the same time slot. The CSI-RS occupies some symbols in the time slot, while the DM-RS is a DM-RS used for demodulation in a control channel and / or a data channel, occupying some symbols in the time slot. The first message may be carried in the control channel and / or the data channel.

[0264] When the first reference signal is SSB, the first message is located in a time slot following the time slot where the first reference signal is located.

[0265] In one possible implementation, the first message belongs to M first messages. In the M first messages, the interval between the time domain resources of two adjacent first messages (ie, the third interval) can be configured by signaling, preconfigured, or predefined, and is not limited thereto.

[0266] For example, the value of M is 3, the three first messages include the first message #A, the first message #B and the first message #C, the interval between the time domain resources of the first message #A and the time domain resources of the first message #B is the third interval, and the interval between the first message #B and the first message #C is also the third interval.

[0267] That is, among the M first messages, the intervals between the time domain resources of any two adjacent first messages are the same. Among them, adjacent first messages can be understood as two first messages without any other first messages in between, such as if there is no other first message between the first message #A and the first message #B, then the first message #A and the first message #B are adjacent first messages. Or, two first messages with an index value difference of 1. For example, the index of the first message #A is 1, and the index of the first message #B is 2, then the first message #A and the first message #B are adjacent first messages. It should be understood that the index can be the index of the first message in the M first messages, or the index of the time domain resource corresponding to a first message, such as the index of the time domain resource corresponding to a first message in the time domain resources corresponding to the M first messages.

[0268] Specifically, the third interval may refer to the example in FIG. 4 .

[0269] Optionally, the number of first messages and the number of reference signals may be the same or different. For example, the first communication device sends 5 first messages and 4 reference signals. Alternatively, the first communication device sends 3 first messages and 6 reference signals. That is, the number of first messages may be greater than the number of reference signals, may be equal to the number of reference signals, or may be less than the number of reference signals. In this application, the example in which the number of first messages and the number of reference signals are the same (i.e., both are M) is used for illustration.

[0270] That is, the first communication device sends M first messages to the second communication device, where the M first messages include a first message corresponding to the first reference signal.

[0271] The M first messages may be sent in the same period, for example, T2. The duration of the period and the number of times the first message is sent in the period (for example, M) may be configured by signaling, preconfigured, or predefined, and are not limited thereto.

[0272] Optionally, T1 is an integer multiple of T2, or T2 is an integer multiple of T1, and T1 and T2 are positive integers. Optionally, T1 can be the same as T2.

[0273] The period for sending the M first messages may also be referred to as a time window, or a time domain resource for the first messages.

[0274] The time window can be statically configured. For example, the interval between the time window and the transmission period of the M reference signals is configured by signaling or is predefined. When the transmission period of the M reference signals is determined, the position of the time window is determined accordingly. Among them, the interval between the time window and the transmission period of the M reference signals (hereinafter referred to as period A) can be the distance in the time domain between the starting position of the time window and the starting position of period A. Or, it is the distance in the time domain between the end position of the time window and the end position of period A. Or, it is the distance in the time domain between the predefined position of the time window and the predefined position of period A.

[0275] Optionally, the interval between the time window and cycle A can also be represented by the time domain resources of the reference signal and the first message. For example, the interval between the time window and cycle A is the time domain interval between the first message in the time window and the reference signal in cycle A.

[0276] Optionally, the position of the time window, or the interval between the time window and cycle A, is associated with the first message.

[0277] For example, the first message is a DCR, and the interval is associated with the priority and / or transmission delay margin of the DCR (or the service to be transmitted indicated in the DCR).

[0278] Specifically, the higher the priority of the DCR (or the service to be transmitted indicated in the DCR) and / or the smaller the delay margin, the smaller the interval; conversely, the higher the priority of the DCR (or the service to be transmitted indicated in the DCR) and / or the larger the delay margin, the larger the interval.

[0279] Optionally, the position of the time window may be indicated by indication information (ie, the third message). For example, the third message indicates the interval between the time window and cycle A (ie, the first interval).

[0280] The time window can also be dynamically indicated. For example, the position of the time window and the window size (the number of time slots included) can be configured or predefined. For example, the starting position of the time window and the window size can be configured to determine the position of the time window in the time domain. For example, if the starting position of the time window is time slot 1 and the window size is 3 time slots, then the time window starts at time slot 1 in the time domain and occupies 3 time slots.

[0281] Optionally, the position of the time window can be indicated by an indication message (ie, a third message). For example, the third message indicates the starting position of the time domain resources of the M first messages. Further, optionally, the third message can also indicate the value of M.

[0282] Optionally, the third message may also indicate the first threshold.

[0283] For example, the first reference signal is a sidelink synchronization signal block S-SSB, and the third message can be carried on a physical sidelink broadcast channel (PSBCH) included in the S-SSB; or, the first reference signal is a CSI-RS, and the third message can be carried on control information sent together with the CSI-RS. The control information includes: downlink control information (DCI), media access control control element (MAC CE), or radio resource control (RRC). In the sidelink, the control information includes: sidelink control information (SCI), MAC CE, or PC5 RRC.

[0284] Unless otherwise specified, PSBCH and physical broadcast channel (PBCH) in this application can be used interchangeably.

[0285] In another possible implementation, each of the M first messages and the corresponding reference signal are quasi-co-located. In other words, the M first messages correspond one-to-one to the transmission beam directions of the M reference signals.

[0286] Aspect 3: Correspondence between the first reference signal and the first message

[0287] For the convenience of description, the first message S is used below to represent the first message corresponding to the first reference signal.

[0288] For example, the first message S and the first reference signal may correspond to each other in the following manner:

[0289] Method 1: The time domain resources of the first reference signal correspond to the time domain resources of the first message S.

[0290] For example, the interval between the time domain resources of the first reference signal and the time domain resources of the first message S (ie, the first interval) is the same as the interval between the time window and the period A mentioned above.

[0291] The first interval is less than or equal to a first threshold, which may be configured by signaling, preconfigured, or predefined, and is not limited thereto. That is, the interval between the time window and cycle A is less than or equal to the first threshold.

[0292] In a possible implementation, the M first messages correspond one-to-one to the M reference signals in the time domain.

[0293] For example, the M first messages also include the first message corresponding to the second reference signal. There is a fourth interval between the time domain resources of the second reference signal and the first message corresponding to the second reference signal, and the fourth interval is the same as the first interval.

[0294] As shown in Figure 4, a schematic diagram of time domain resources of a first message and a reference signal is shown. The first interval and the fourth interval mentioned above can refer to the example in Figure 4.

[0295] Taking the reference signal as S-SSB and the first message as DCR as an example, the figure contains four S-SSBs and four DCRs, and these four S-SSBs correspond one to one with these four DCRs. Specifically, S-SSB#A corresponds to DCR#A, S-SSB#B corresponds to DCR#B, S-SSB#C corresponds to DCR#C, and S-SSB#D corresponds to DCR#D. For example, the arrangement order of S-SSB#A to S-SSB#D in the time domain is the arrangement order of DCR#A to DCR#D. Moreover, the interval between any pair of S-SSBs and DCRs in the time domain is the same.

[0296] Alternatively, the index of the first reference signal in the M reference signals corresponds to the index of the first message S in the M first messages. For example, M is 3, the three reference signals are reference signal 1, reference signal 2, and reference signal 3; the three first messages are first message 1, first message 2, and first message 3. The first reference signal is reference signal 1, and the first message S is first message 1.

[0297] Alternatively, the index of the time domain resource of the first reference signal in the time domain resources of the M reference signals corresponds to the index of the time domain resource of the first message S in the time domain resources of the M first messages. For example, M is 3, and the three reference signals are reference signal A, whose time domain resource is time slot 1, reference signal B, whose time domain resource is time slot 2, and reference signal C, whose time domain resource is time slot 3; and the three first messages are first message A, whose time domain resource is time slot A, first message B, whose time domain resource is time slot B, and first message C, whose time domain resource is time slot C. The first reference signal is reference signal B, and the first message S is first message B.

[0298] Method 2: The frequency domain resources of the first reference signal correspond to the frequency domain resources of the first message S.

[0299] For example, the first reference signal occupies a first frequency domain resource subset, the first message S occupies a second frequency domain resource subset, and the first frequency domain resource subset corresponds to the second frequency domain resource subset.

[0300] Specifically, there are two situations, and different situations are described below.

[0301] Case 1: The location of the frequency domain resource of the first reference signal is the same as the location of the frequency domain resource of the first message, and the sizes thereof may be the same or different.

[0302] For example, the following are possible:

[0303] Possibility 1: The frequency domain resource positions and sizes of the first frequency domain resource subset and the second frequency domain resource subset are the same. For example, if the BMRS is S-SSB, the size of the frequency domain resource subset occupied by the S-SSB is the same as the size of the frequency domain resource subset occupied by the first message, and the position of the S-SSB in the resource pool or transmission bandwidth is the same as the position of the first message in the resource pool or transmission bandwidth. The units of the optional frequency position and size can be any one of Hz, kHz, MHz, RE or RB, and this application does not impose any restrictions on this.

[0304] Possibility 2: the frequencies of the frequency domain resources of the first frequency domain resource subset and the second frequency domain resource subset are the same, and / or the sizes of the frequency domain resources of the first frequency domain resource subset and the second frequency domain resource subset are the same.

[0305] Possibility 3: The frequencies of the frequency domain resources of the first frequency domain resource subset and the second frequency domain resource subset are the same, and the size of the first frequency domain resource subset is smaller than or equal to the size of the frequency domain resources of the second frequency domain resource subset.

[0306] Possibility 4: The frequencies of the frequency domain resources of the first frequency domain resource subset and the second frequency domain resource subset are the same, and the size of the second frequency domain resource subset is less than or equal to the size of the frequency domain resources of the first frequency domain resource subset. For example, if the BMRS is a CSI-RS, the bandwidth of the CSI-RS may be greater than the bandwidth of the first message. Optionally, the same frequencies include the same center frequency and the same start and end frequencies.

[0307] Optionally, in this application, the units of frequency position and size can be any one of Hz, kHz, MHz, RE, or RB, and this application does not impose any restrictions on this. Optionally, the same frequency includes the same center frequency and / or the same start and end frequencies. The same occupied frequency domain can mean that all occupied REs are the same, or that the occupied RBs are the same but the number of occupied REs is different.

[0308] FIG5 shows a schematic diagram of frequency domain resources of a reference signal and a first message.

[0309] As shown in the figure, the S-SSB is used as an example of a reference signal, the DCR is used as an example of a first message, and the subband is used as an example of a frequency domain resource subset. The figure includes four S-SSBs, namely S-SSB#A, S-SSB#B, S-SSB#C, and S-SSB#D, and four DCRs, namely DCR#A, DCR#B, DCR#C, and DCR#D. The frequency domain resources occupied by S-SSB#A and DCR#A are on subband A, the frequency domain resources occupied by S-SSB#B and DCR#B are on subband B, the frequency domain resources occupied by S-SSB#C and DCR#C are on subband C, and the frequency domain resources occupied by S-SSB#D and DCR#D are on subband D. On each subband, the center frequency of the frequency domain resources occupied by S-SSB and DCR are the same. Optionally, on each subband, the frequencies of the frequency domain resources occupied by the S-SSB and the DCR are the same, and all occupied REs may be the same, or the occupied RBs may be the same but the number of occupied REs may be different.

[0310] Optionally, in this application, a subband may be a set of frequency domain resources for transmitting a first reference signal and / or a first message. Optionally, these frequency domain resources may be contiguous. Optionally, the size of the subband may be configured or predefined via signaling. Optionally, the subband unit may be RE, PRB, subchannel, etc.

[0311] In this figure, the size of the frequency domain resource subset occupied by each S-SSB is the same as that occupied by each DCR. Furthermore, the size of the frequency domain resource subset occupied by the S-SSB is the same as that occupied by the DCR.

[0312] In one possible implementation, the intervals between frequency domain resource subsets of any two adjacent reference signals in the frequency domain among the M reference signals are equal, and the intervals between frequency domain resource subsets of any two adjacent first messages in the frequency domain among the M first messages are equal.

[0313] Among them, reference signals that are adjacent in the frequency domain can be understood as reference signals that occupy adjacent subsets of frequency domain resources. For example, S-SSB#A and S-SSB#B, or S-SSB#B and S-SSB#C, or S-SSB#C and S-SSB#D in Figure 5 are all reference signals that are adjacent in the frequency domain. First messages that are adjacent in the frequency domain can be understood as first messages that occupy adjacent subsets of frequency domain resources. For example, DCR#A and DCR#B, or DCR#B and DCR#C, or DCR#C and DCR#D in Figure 5 are all first messages that are adjacent in the frequency domain.

[0314] In this case, the intervals between each reference signal and the time domain resources of its corresponding first message are the same.

[0315] Case 2: The location of the frequency domain resource of the first reference signal is different from the location of the frequency domain resource of at least one of the M first messages.

[0316] There are two situations in this case:

[0317] Scenario 2.1: The first reference signal belongs to M reference signals, the first message corresponding to the first reference signal belongs to M first messages, at least two of the M first messages have different frequency domain resource subset positions and the same time domain resource positions, and at least two of the M reference signals have the same frequency domain resource subset positions and different time domain resource positions.

[0318] FIG6 shows a schematic diagram of time-frequency resources of a reference signal and a first message.

[0319] As shown in the figure, the S-SSB is used as an example of a reference signal, the DCR is used as an example of a first message, and the subband is used as an example of a frequency domain resource subset. The figure includes four S-SSBs, namely S-SSB#A, S-SSB#B, S-SSB#C, and S-SSB#D, and four DCRs, namely DCR#A, DCR#B, DCR#C, and DCR#D. The frequency domain resources occupied by DCR#A are on subband A, the frequency domain resources occupied by DCR#B are on subband B, the frequency domain resources occupied by DCR#C are on subband C, and the frequency domain resources occupied by DCR#D are on subband D. S-SSB#A, S-SSB#B, S-SSB#C, and S-SSB#D occupy the same frequency domain resources, but S-SSB#A, S-SSB#B, S-SSB#C, and S-SSB#D occupy different time domain resources.

[0320] In this case, the intervals between each reference signal and the time domain resources of its corresponding first message are different.

[0321] The following takes the first reference signal and the first message S as an example to illustrate the correspondence between the reference signal and the first message in this case.

[0322] Method ①: The index of the time domain resource of the first reference signal is associated with the index of the second frequency domain resource subset.

[0323] For example, the M reference signals include a first reference signal and a second reference signal, the index of the frequency domain resource subset of the first message corresponding to the first reference signal is the first index, and the index of the frequency domain resource subset of the first message corresponding to the second reference signal is the second index.

[0324] The index of the time domain resource of the first reference signal is a third index, and the third index is associated with the first index;

[0325] The index of the time domain resource of the second reference signal is a fourth index, and the fourth index is associated with the second index.

[0326] Still taking Figure 6 as an example: assuming that the first reference signal is S-SSB#A, the first message S is DCR#A, the index of the time domain resource occupied by S-SSB#A is 1, the index of the frequency domain resource subset occupied by DCR#A is 1, the index of the time domain resource occupied by S-SSB#B is 2, and the index of the frequency domain resource subset occupied by DCR#A is 2. That is, the frequency domain resource subset occupied by DCR#A can be determined by the time domain resource occupied by S-SSB#A.

[0327] Method ②: The first reference signal carries first indication information, and the first indication information indicates the frequency domain resources of the first message S.

[0328] For example, the first indication information indicates the index of the second frequency domain resource subset.

[0329] For example, the first reference signal is S-SSB, and the PBCH included in the S-SSB carries an index indicating the second frequency domain subset.

[0330] In another example, the first reference signal is CSI-RS and / or DM-RS, and the first indication information is indicated in the control information sent together with the CSI-RS and / or DM-RS in the first time slot, and the control information includes: SCI, MAC CE or PC5 RR.

[0331] Method ③: Associating the frequency domain resources of the first message S through the sequence of the first reference signal.

[0332] For example, the first reference signal is associated with a data channel carrying a first message corresponding to the first reference signal, and the first sequence used by the demodulation reference signal in the data channel is associated with the first reference signal; and / or, the bits of the first message corresponding to the first reference signal are scrambled using a second sequence, and the second sequence is associated with the first reference signal.

[0333] The bits of the first message corresponding to the first reference signal may be bits of the first message before encoding, or bits of the first message after encoding but before modulation.

[0334] Optionally, the first sequence or the second sequence is generated based on a first parameter, where the first parameter includes one or more of the following:

[0335] An index of a time domain resource of a first reference signal;

[0336] an index of a beam of the first reference signal;

[0337] a first reference signal sequence identifier;

[0338] The first reference signal includes a value indicated by the control information.

[0339] For example, when the first reference signal is an S-SSB, the index of the time domain resource of the first reference signal may be the index of the time slot in which the S-SSB is located. The index of the beam of the first reference signal may be the index of the beam that transmits the S-SSB. The first reference signal sequence identifier may be the identifier of the sequence used to transmit the S-SSB. Optionally, the sequence identifier is the identifier of the synchronization signal transmitted in the S-SSB. Optionally, the sequence identifier is the cyclic shift value of the sequence used by the first reference signal. Optionally, the sequence identifier is the root sequence number of the sequence used by the first reference signal.

[0340] The control information included in the first reference signal indicates a value, which is an integer. For example, the value may be generated by the first communication device or indicated by configuration signaling. Optionally, the value may be a random number.

[0341] Optionally, the first sequence or the second sequence is further generated based on a source identifier and / or a destination identifier. The source identifier is the identifier of the first communication device, and the destination identifier is the identifier of the second communication device or the service identifier of the data to be sent by the first communication device. Specifically, the source identifier and the destination identifier can be referred to the above description and will not be repeated here.

[0342] In one possible implementation, the source identifier and / or the destination identifier may be indicated by control information included in a reference signal.

[0343] For example, the control information includes: DCI, MAC CE or RRC. In the sidelink, the control information includes: SCI, MAC CE or PC5 RRC.

[0344] When the first communication device does not obtain the source identifier and / or the destination identifier, the first communication device may send a fourth message, where the fourth message indicates the above-mentioned numerical value, ie, a random number.

[0345] For example, one or more of a cyclic shift value, a root sequence number, an initial value, an initial position, and an orthogonal cover code of the first sequence and / or the second sequence may be determined based on a first parameter. Optionally, the first parameter may be any one of the following:

[0346] N R ,

[0347] 2 n ·B ID +N R , or B ID +2 n ·N R

[0348] or

[0349] or

[0350] or,

[0351] or

[0352] or,

[0353] Among them, N sID is the source identifier, N dID For the purpose of identification, N R is a random number (i.e., the value indicated in the reference signal), B ID is the index of the beam of the first reference signal, The index of the time domain resource of the first reference signal, where n is an integer and m is an integer. Optional n and m can be positive integers, zero, or negative integers, which are not limited in this application.

[0354] Optionally, the parameters used in the above-mentioned sequence generation can be complete bits or partial bits of the parameters. For example, the random number can occupy 24 bits, N R It can be 24 bits or partial bits, such as 8 bits, 16 bits, etc.

[0355] Optionally, one or more of the cyclic shift value, root sequence number, initial value, and initial position of the first sequence and / or the second sequence may be equal to the value determined by the first parameter.

[0356] Optionally, in this application, a random sequence or pseudo-random sequence can be generated as follows: PN The sequence c(n), n=0,1,...,M PN -1 is defined as follows: c(n) = (x1(n+N C )+x2(n+N C ))mod 2 x1(n+31)=(x1(n+3)+x1(n))mod 2 x2(n+31)=(x2(n+3)+x2(n+2)+x2(n+1)+x2(n))mod 2

[0357] Here, Nc=1600, and the initial values ​​of the first m-sequence x1(n) are x1(0)=1, x1(n)=0, n=1, 2, ..., 30. The initial values ​​of the second m-sequence x2(n) are

[0358] Optionally, generate the initial value c of this random sequence init It can be determined in any of the above ways.

[0359] Optionally, the above sequence is sometimes also called a Gold sequence, and the length of its shift register is 31 bits.

[0360] Optionally, for the initial position N x The first sequence and / or the second sequence may be determined as follows:

[0361] c(n)=(x1(n+N C +N x )+x2(n+N C +N x ))mod 2

[0362] Among them, N x It is determined according to the first parameter mentioned above.

[0363] Scenario 2.2: The first reference signal belongs to M reference signals, the first message belongs to M first messages, at least two of the M first messages have different frequency domain resource subset positions and the same time domain resource positions, and at least two of the M reference signals have the same frequency domain resource subset positions and time domain resource positions but different sequences.

[0364] Optionally, different sequences in the present application refer to different values ​​of any one or more parameters in the following generated sequences: initial value of the sequence, initial position of the sequence, root sequence number of the sequence, cyclic shift value of the sequence, orthogonal cover code of the sequence.

[0365] Optionally, the same sequence in this application means that the values ​​of any one or more parameters in the following generated sequences are the same: the initial value of the sequence, the initial position of the sequence, the root sequence number of the sequence, the cyclic shift value of the sequence, and the orthogonal cover code of the sequence.

[0366] In this case, the intervals between each reference signal and the time domain resources of its corresponding first message are different.

[0367] In other words, the M reference signals are sent in a code division manner.

[0368] FIG7 shows a schematic diagram of time-frequency resources of a reference signal and a first message.

[0369] As shown in the figure, the S-SSB is used as an example of a reference signal, the DCR is used as an example of a first message, and the subband is used as an example of a frequency domain resource subset. The figure includes four S-SSBs: S-SSB#A, S-SSB#B, S-SSB#C, and S-SSB#D, and four DCRs: DCR#A, DCR#B, DCR#C, and DCR#D. DCR#A occupies a frequency domain resource subset on subband A, DCR#B on subband B, DCR#C on subband C, and DCR#D on subband D. S-SSB#A, S-SSB#B, S-SSB#C, and S-SSB#D occupy the same time and frequency domain resources, but their sequences are different. In other words, the sequences used to send S-SSB#A, S-SSB#B, S-SSB#C, and S-SSB#D are different. For example, S-SSB#A corresponds to sequence A, S-SSB#B corresponds to sequence B, S-SSB#C corresponds to sequence C, and S-SSB#D corresponds to sequence D.

[0370] Optionally, different sequences can be generated based on the parameters of the corresponding reference signal. For example, sequence A is generated based on the parameters of S-SSB#A, sequence B is generated based on the parameters of S-SSB#B, sequence C is generated based on the parameters of S-SSB#C, and sequence D is generated based on the parameters of S-SSB#D. For specific sequence generation methods, please refer to the description in method ③ above.

[0371] Among them, sequence A is associated with subband A, sequence B is associated with subband B, sequence C is associated with subband C, and sequence D is associated with subband D.

[0372] Optionally, the first communication device sends a fifth message to the second communication device, where the fifth message indicates whether the first message is present within the period of the reference signal. If the first message is present, the second communication device may receive the first message on the corresponding time-frequency resource. If the first message is not present, the second communication device does not need to receive the first message. This can further reduce power consumption of the second communication device.

[0373] In one possible implementation, the fifth message is carried in control information sent together with the reference signal. The control information sent together with the reference signal can be understood as control information occupying the same time domain resources as the reference signal. Further, it can be understood as control information occupying the same time domain resource unit (such as a time slot) as the reference signal. For example, taking the S-SSB as an example of a reference signal, the control information can be a sidelink master information block (SL-MIB).

[0374] The control information includes: DCI, MAC CE or RRC. In the sidelink, the control information includes: SCI, MAC CE or PC5RRC.

[0375] The control information sent together with the reference signal in other parts of this application can be referred to the description here.

[0376] Specifically, the first message is a DCR message, and the fifth message may indicate the following information:

[0377] There is no DCR message in the period of this reference signal;

[0378] There is a DCR message in the period of this reference signal;

[0379] It is uncertain whether there is a DCR message in the period where the reference signal is located, or there may or may not be a DCR message in the period where the reference signal is located.

[0380] Among them, when the fifth message indicates that there is a DCR message in the period where the reference signal is located or it is uncertain whether there is a DCR message in the period where the reference signal is located, the second communication device needs to detect on the time-frequency resources of the DCR message corresponding to the reference signal, or try to receive the DCR message.

[0381] Aspect 4: Second message

[0382] For example, the second message may be a beam response message, such as a beam report.

[0383] In one possible implementation, the second message corresponds to the first reference signal. For example, a fifth interval exists between the time domain resources of the first reference signal and the second message corresponding to the first reference signal, and the fifth interval is less than or equal to a second threshold. The second threshold can be configured by signaling, preconfigured, or predefined, and is not limited thereto.

[0384] For example, the time domain resources of the first reference signal correspond to the time domain resources of the second message. For example, there is a one-to-one correspondence between M first reference signals and M time domain resources of the second messages. Specifically, reference may be made to the description of the correspondence between the first reference signal and the time domain resources of the first message in the aforementioned approach 1, which also applies to the correspondence between the time domain resources of the second message and the first reference signal.

[0385] For example, the frequency domain resources of the first reference signal correspond to the frequency domain resources of the second message. For example, the position of the frequency domain resources of the first reference signal is the same as the position of the frequency domain resources of the second message, and the sizes may be the same or different. For another example, the position of the frequency domain resources of the first reference signal is different from the position of the frequency domain resources of at least one of the M first messages. Specifically, reference may be made to the description of the correspondence between the frequency domain resources of the first reference signal and the first message in Method 2, which also applies to the correspondence between the time domain resources of the second message and the first reference signal.

[0386] For example, a first reference signal is associated with a first channel of a second message. The first channel is a data channel or a control channel that transmits information based on coded bits. A third sequence used in a demodulation reference signal in the first channel is associated with the first reference signal; and / or bits of the second message corresponding to the first reference signal are scrambled using a fourth sequence associated with the first reference signal.

[0387] For example, the first reference signal is associated with a first channel of the second message. The first channel is a control channel based on the fifth sequence indication information. The fifth sequence in the first channel is associated with the first reference signal. Optionally, the first channel is a feedback channel, such as a PUCCH or a PSFCH.

[0388] Optionally, the third sequence, the fourth sequence, and / or the fifth sequence may be determined using the first parameter in the above-described method ③. Optionally, the value of at least one of the following parameters of the third sequence, the fourth sequence, and / or the fifth sequence is determined: an initial value of the sequence, an initial position of the sequence, a root sequence number of the sequence, a cyclic shift value of the sequence, and an orthogonal cover code of the sequence.

[0389] In other words, the correspondence between the first reference signal and the first message is also applicable to the correspondence between the first reference signal and the second message.

[0390] In one possible implementation, the second message corresponds to the first message. For example, there is a sixth interval between the first reference signal and the time domain resources of the second message corresponding to the first reference signal (see the example in Figure 8), and the sixth interval is less than or equal to a third threshold. The third threshold can be signaling-configured, preconfigured, or predefined, and is not limited to this. The sixth interval can be the interval between the first reference signal and the start (or end) position of the time domain resources of the second message corresponding to the first reference signal, or the interval between the first reference signal and the predefined position of the time domain resources of the second message corresponding to the first reference signal, and is not limited to this.

[0391] FIG8 shows a schematic diagram of a second message, a first reference signal, and time-frequency resources of the first message. The fifth interval may refer to the example in FIG8 .

[0392] As shown in the figure, the time domain resources of the M second messages correspond one-to-one with the time domain resources of the M reference signals, and also correspond one-to-one with the time domain resources of the M first messages. In the figure, M is set to 4.

[0393] Among them, the correspondence between the second message and the reference signal can refer to the correspondence between the first message and the reference signal in aspect 3, and will not be repeated here.

[0394] The time domain resources of the M second messages may also be referred to as the time window of the second message. The time window of the second message may be determined based on the position of the time domain resources of the reference signal and the fifth interval. Alternatively, the time window of the second message may be determined based on the starting position of the time window and the number of second messages. Alternatively, the time window of the second message may be determined based on the position of the time window of the first message and the interval between the time window of the second message and the time window of the first message.

[0395] Optionally, the intervals between adjacent second messages in the M second messages may be the same. Adjacent second messages may be adjacent second messages in the frequency domain or adjacent second messages in the time domain. For a specific explanation of "adjacent," please refer to the previous description and will not be repeated here.

[0396] Optionally, the time window of the M second messages may be after the time window of the M first messages and before or after the time window of the sixth message. The sixth message is used to establish a connection between the first communication device and the second communication device. For example, the sixth message may be a direct communication acceptance (DCA) message, or a security establishment message.

[0397] That is, the following implementation is possible:

[0398] Implementation 1: The time domain resources of the second message are different from the time domain resources of the first message, but the frequency domain resources are the same.

[0399] Implementation 2: The time domain resources of the second message are the same as those of the first message, but the frequency domain resources are different.

[0400] Implementation 3: The time domain resources of the second message are different from the time domain resources of the first message, and the frequency domain resources are different.

[0401] Taking implementation 1 as an example, FIG9 shows a schematic diagram of time-frequency resources of a second message, a first message, and a reference signal.

[0402] As shown in the figure, an S-SSB is used as an example of a reference signal, a DCR is used as an example of a first message, a beam response message is used as an example of a second message, and a subband is used as an example of a frequency domain resource subset. The figure includes four S-SSBs: S-SSB#A, S-SSB#B, S-SSB#C, and S-SSB#D; four DCRs: DCR#A, DCR#B, DCR#C, and DCR#D; and four second messages: Beam Response Message#A, Beam Response Message#B, Beam Response Message#C, and Beam Response Message#D. The frequency domain resource subset occupied by DCR#A is on subband A, the frequency domain resource subset occupied by DCR#B is on subband B, the frequency domain resource subset occupied by DCR#C is on subband C, and the frequency domain resource subset occupied by DCR#D is on subband D. S-SSB#A, S-SSB#B, S-SSB#C, and S-SSB#D occupy the same time domain resources but different frequency domain resources. Beam response message #A, Beam response message #B, Beam response message #C, and Beam response message #D occupy the same time domain resources but different frequency domain resources. The time domain resources of the Beam response message are different from those of the first message, but the frequency domain resources are the same. For example, S-SSB#A corresponds to DCR#A and Beam response message #A, and the frequency domain resources of S-SSB#A, DCR#A, and Beam response message #A are all on subband 1.

[0403] In a possible implementation, the number of the second messages may be greater than or equal to the number of reference signals. That is, the number of the second messages is not limited to M, and may also be other values ​​greater than or equal to M.

[0404] Further optionally, the first communication device detects (also referred to as receives, parses, decodes, etc.) the second message sent by the second communication device within a time window of Q second messages. If the first communication device does not detect the second message within the time window, the first communication device transmits up to Q reference signals until the second message is detected.

[0405] Further optionally, if the second communication device successfully detects the first message, it determines whether it is the target of the first communication device:

[0406] If the first communication device is not the target, the corresponding first message and the reference signal corresponding thereto are not processed.

[0407] If the second communication device is the target of the first communication device, it determines whether to accept the first message (e.g., DCR) from the first communication device. If not, the corresponding first message and the reference signal associated therewith are not processed. If accepted, the second communication device sends a second message corresponding to the reference signal and / or the first message to the first communication device.

[0408] Further optionally, before sending the reference signal, the first communication device may also obtain configuration information, which may indicate the type of reference signal, the number of times the reference signal is sent, the time domain information of the reference signal (including the sending period, the time domain position within the sending period, the number within the sending period, and the interval between adjacent reference signals within the period), the time domain information of the first message (such as the time window), the time domain information of the second message (such as the time window, the time domain position within the time window, the number of second messages within the time window, and the interval between adjacent second messages), and the frequency domain resources (including the frequency domain resources of the reference signal, the frequency domain resources of the first message, and the frequency domain resources of the second message). Optionally, the second communication device may also receive the configuration information. For example, the first communication device sends the configuration information to the second communication device, or the network device indicates the configuration information to the second communication device. Optionally, the configuration information may be indicated by the network device, or by other terminal devices, or may be preconfigured or predefined.

[0409] In one possible implementation, using subbands as an example of frequency domain resources, a first communications device can detect which subbands within the resource pool are idle and then send a reference signal and a first message on the corresponding subband. This subband can also be used by a second communications device to send a second message. Optionally, the configuration message also includes a signal quality threshold for idle subbands and a signal quality occupancy threshold.

[0410] In this method, after the second communication device determines that it is the target of the first communication device, it performs beam processing, such as beam matching. If the second communication device is not the target of the transmitter, no processing, such as beam matching, is performed. This reduces unnecessary transmissions and the corresponding power consumption of non-target communication devices.

[0411] It should be understood that the communication method provided in the embodiment of the present application can be applied to sideline communication.

[0412] It can also be understood that in each embodiment of the present application, the interaction between the first communication device and the second communication device is mainly used as an example for illustrative description, and the present application is not limited to this.

[0413] It can also be understood that some optional features in the various embodiments of the present application may not depend on other features in certain scenarios, and may also be combined with other features in certain scenarios, without limitation.

[0414] It can also be understood that the solutions in the various embodiments of the present application can be reasonably combined and used, and the explanations or descriptions of the various terms appearing in the embodiments can be referenced or explained with each other in the various embodiments, without limitation to this.

[0415] It can also be understood that in the above-mentioned various method embodiments, the methods and operations implemented by the communication device can also be implemented by components (such as chips or circuits) that can be implemented by the communication device.

[0416] Corresponding to the methods provided in the above method embodiments, embodiments of the present application also provide corresponding apparatuses, which include modules for executing the corresponding methods in the above method embodiments. The modules may be software, hardware, or a combination of software and hardware. It is understood that the technical features described in the above method embodiments are also applicable to the following apparatus embodiments.

[0417] FIG10 is a schematic block diagram of a communication device 1000 provided in an embodiment of the present application. The device 1000 includes a transceiver unit 1010. The transceiver unit 1010 can be used to implement corresponding communication functions. The transceiver unit 1010 can also be referred to as a communication interface or a communication unit.

[0418] Optionally, the apparatus 1000 further includes a processing unit 1020. The processing unit 1020 may be configured to perform information processing.

[0419] Optionally, the device 1000 also includes a storage unit, which can be used to store instructions and / or data. The processing unit 1020 can read the instructions and / or data in the storage unit so that the device implements the actions of the communication device in the aforementioned method embodiments.

[0420] In one design, the device 1000 may be the first communication device in the aforementioned embodiment, or may be a component (e.g., a chip) of the first communication device. The device 1000 may implement steps or processes corresponding to those performed by the first communication device in the above method embodiment, wherein the transceiver unit 1010 may be configured to perform the transceiver-related operations of the first communication device in the above method embodiment, and the processing unit 1020 may be configured to perform the processing-related operations of the first communication device in the above method embodiment.

[0421] In a possible implementation, the transceiver unit 1010 is configured to send a reference signal and a first message; may also be configured to receive a second message from a second communication device; and may also receive configuration information.

[0422] In another possible implementation, the processing unit 1020 is configured to detect the second message and also to process configuration information.

[0423] The device 1000 can implement the steps or processes executed by the first communication device in the method embodiment according to the embodiment of the present application. The device 1000 may include a unit for executing the method executed by the first communication device in the embodiments shown in Figures 3 to 9.

[0424] In another design, the device 1000 may be the second communication device in the aforementioned embodiment, or may be a component (e.g., a chip) of the second communication device. The device 1000 may implement steps or processes corresponding to those performed by the second communication device in the above method embodiment, wherein the transceiver unit 1010 may be configured to perform the transceiver-related operations of the second communication device in the above method embodiment, and the processing unit 1020 may be configured to perform the processing-related operations of the second communication device in the above method embodiment.

[0425] In a possible implementation, the processing unit 1020 is configured to process the reference signal and the first message.

[0426] In another possible implementation, the transceiver unit 1010 is configured to receive a reference signal and a first message; and may also be configured to send a second message.

[0427] The device 1000 can implement the steps or processes executed by the second communication device in the method embodiment according to the embodiment of the present application. The device 1000 may include a unit for executing the method executed by the second communication device in the embodiments shown in Figures 3 to 9.

[0428] A more detailed description of the device 1000 can be directly obtained by referring to the relevant description in the above method embodiment, which will not be repeated here.

[0429] It should be understood that the specific process of each unit executing the above corresponding steps has been described in detail in the above method embodiments, and for the sake of brevity, it will not be repeated here.

[0430] It should also be understood that the device 1000 here is embodied in the form of a functional unit. The term "unit" here may refer to an application specific integrated circuit (ASIC), an electronic circuit, a processor (such as a shared processor, a dedicated processor or a group processor, etc.) and a memory for executing one or more software or firmware programs, a combined logic circuit and / or other suitable components that support the described functions. In an optional example, those skilled in the art will understand that the device 1000 can be specifically a communication device (such as a first communication device, and also such as a second communication device) in the above-mentioned embodiment, and can be used to execute the various processes and / or steps corresponding to the communication device in the above-mentioned method embodiments. To avoid repetition, they will not be described here.

[0431] The apparatus 1000 of each of the above-mentioned solutions has the function of implementing the corresponding steps performed by the communication device (such as the first communication device, and the second communication device) in the above-mentioned method. The functions can be implemented by hardware, or the corresponding software can be implemented by hardware. The hardware or software includes one or more modules corresponding to the above-mentioned functions; for example, the transceiver unit can be replaced by a transceiver (for example, the sending unit in the transceiver unit can be replaced by a transmitter, and the receiving unit in the transceiver unit can be replaced by a receiver), and other units, such as the processing unit, can be replaced by a processor to respectively perform the sending and receiving operations and related processing operations in each method embodiment.

[0432] In addition, the transceiver unit 1010 may also be a transceiver circuit (for example, may include a receiving circuit and a sending circuit), and the processing unit may be a processing circuit.

[0433] It should be noted that the apparatus in FIG10 may be the device in the aforementioned embodiment, or may be a chip or chip system, such as a system on chip (SoC). The transceiver unit may be an input / output circuit or a communication interface; the processing unit may be a processor, microprocessor, or integrated circuit integrated on the chip. This is not limited here.

[0434] Figure 11 is a schematic block diagram of a communication device 1100 provided in an embodiment of the present application. The device 1100 includes a processor 1110, which is coupled to a memory 1120. Optionally, the memory 1120 is further included to store computer programs or instructions and / or data. The processor 1110 is configured to execute the computer programs or instructions stored in the memory 1120, or read data stored in the memory 1120, to perform the methods described in the above method embodiments.

[0435] Optionally, there are one or more processors 1110 .

[0436] Optionally, there are one or more memories 1120 .

[0437] Optionally, the memory 1120 is integrated with the processor 1110 or provided separately.

[0438] Optionally, as shown in Figure 11 , the apparatus 1100 further includes a transceiver 1130, which is configured to receive and / or transmit signals. For example, the processor 1110 is configured to control the transceiver 1130 to receive and / or transmit signals.

[0439] As a solution, the device 1100 is used to implement the operations performed by the communication device in the above various method embodiments.

[0440] For example, the processor 1110 is configured to execute computer programs or instructions stored in the memory 1120 to implement relevant operations of the first communication device or the second communication device in each of the above method embodiments.

[0441] During implementation, each step of the above method can be completed by an integrated logic circuit of the hardware in the processor 1110 or by instructions in the form of software. The method disclosed in conjunction with the embodiments of the present application can be directly embodied as being executed by a hardware processor, or can be executed by a combination of hardware and software modules in the processor. The software module can be located in a mature storage medium in the art, such as a random access memory, a flash memory, a read-only memory, a programmable read-only memory or an electrically erasable programmable memory, a register, etc. The storage medium is located in the memory 1120, and the processor 1110 reads the information in the memory 1120 and completes the steps of the above method in combination with its hardware. To avoid repetition, it will not be described in detail here.

[0442] It should be understood that in the embodiments of the present application, the processor may be one or more integrated circuits for executing relevant programs to execute the method embodiments of the present application.

[0443] A processor (e.g., processor 1110) may include one or more processors and be implemented as a combination of computing devices. The processor may include one or more of the following: a microprocessor, a microcontroller, a digital signal processor (DSP), a digital signal processing device (DSPD), an application-specific integrated circuit (ASIC), a field programmable gate array (FPGA), a programmable logic device (PLD), gating logic, transistor logic, discrete hardware circuits, processing circuits, or other suitable hardware, firmware, and / or a combination of hardware and software to perform the various functions described in this disclosure. The processor may be a general-purpose processor or a special-purpose processor. For example, processor 1110 may be a baseband processor or a central processing unit. A baseband processor may be used to process communication protocols and communication data. A central processing unit may be used to enable the device to execute software programs and process data in the software programs. In addition, a portion of the processor may also include non-volatile random access memory. For example, the processor may also store information about the device type.

[0444] In this application, the term "program" is used broadly to refer to software. Non-limiting examples of software include program code, program, subroutine, instruction, instruction set, code, code segment, software module, application, or software application. The program can be executed in a processor and / or computer to cause the device to perform the various functions and / or processes described in this application.

[0445] The memory (e.g., memory 1120) can store data required by the processor (e.g., processor 1110) when executing software. The memory can be implemented using any suitable storage technology. For example, the memory can be any available storage medium that can be accessed by the processor and / or computer. Non-limiting examples of storage media include random access memory (RAM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), compact disc read-only memory (CD-ROM), static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), double data rate synchronous dynamic random access memory (DDR SDRAM), enhanced synchronous dynamic random access memory (ESDRAM), synchronous link dynamic random access memory (SLDRAM), and direct rambus RAM (DR RAM), removable media, optical disk storage, magnetic disk storage media, magnetic storage devices, flash memory, registers, state memory, remotely mounted storage, local or remote memory components, or any other medium capable of carrying or storing software, data, or information and accessible by a processor / computer. It should be noted that the memory described herein is intended to include, but is not limited to, these and any other suitable types of memory.

[0446] The memory (e.g., memory 1120) and the processor (e.g., processor 1110) may be provided separately or integrated together. The memory may be used to connect to the processor so that the processor can read information from the memory and store and / or write information to the memory. The memory may be integrated into the processor. The memory and the processor may be provided in an integrated circuit (e.g., the integrated circuit may be provided in a UE or other network node).

[0447] 12 is a schematic block diagram of a chip system 1200 provided in an embodiment of the present application. The chip system 1200 (or also referred to as a processing system) includes a logic circuit 1210 and an input / output interface 1220 .

[0448] Logic circuit 1210 may be a processing circuit within chip system 1200. Logic circuit 1210 may be coupled to a storage unit and invoke instructions within the storage unit, enabling chip system 1200 to implement the methods and functions of various embodiments of the present application. Input / output interface 1220 may be an input / output circuit within chip system 1200, outputting information processed by chip system 1200 or inputting data or signaling information to be processed into chip system 1200 for processing.

[0449] As a solution, the chip system 1200 is used to implement the operations performed by the communication device in the above various method embodiments.

[0450] For example, the logic circuit 1210 is used to implement the processing-related operations performed by the first communication device in the above method embodiments, such as the processing-related operations performed by the first communication device in the embodiment shown in Figure 3; the input / output interface 1220 is used to implement the sending and / or receiving-related operations performed by the first communication device in the above method embodiments, such as the sending and / or receiving-related operations performed by the first communication device in the embodiment shown in Figure 3.

[0451] For another example, the logic circuit 1210 is used to implement the processing-related operations performed by the second communication device in the above method embodiments, such as the processing-related operations performed by the second communication device in the embodiment shown in Figure 3; the input / output interface 1220 is used to implement the sending and / or receiving-related operations performed by the second communication device in the above method embodiments, such as the sending and / or receiving-related operations performed by the second communication device in the embodiment shown in Figure 3.

[0452] An embodiment of the present application further provides a computer-readable storage medium storing computer instructions for implementing the methods executed by a communication device (such as the first communication device or the second communication device) in the above-mentioned method embodiments.

[0453] An embodiment of the present application further provides a computer program product comprising instructions, which, when executed by a computer, implement the methods performed by a communication device (such as the first communication device or the second communication device) in the above-mentioned method embodiments.

[0454] An embodiment of the present application further provides a communication system, which includes the first communication device and the second communication device in the above embodiments.

[0455] The explanation of the relevant contents and beneficial effects of any of the above-mentioned devices can be referred to the corresponding method embodiments provided above, which will not be repeated here.

[0456] In the several embodiments provided in this application, it should be understood that the disclosed devices and methods can be implemented in other ways. For example, the device embodiments described above are only schematic. For example, the division of the above-mentioned units is only a logical function division. There may be other division methods in actual implementation. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. In addition, the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms.

[0457] The units described above as separate components may or may not be physically separate, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed across multiple network units. Some or all of these units may be selected according to actual needs to implement the solutions provided in this application.

[0458] In addition, each functional unit in each embodiment of the present application may be integrated into one unit, each unit may exist physically separately, or two or more units may be integrated into one unit.

[0459] Those skilled in the art will appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of this application.

[0460] When software is used for implementation, it can be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on a computer, the process or function described in the embodiment of the present application is generated in whole or in part. The computer can be a general-purpose computer, a special-purpose computer, a computer network or other programmable devices. For example, the computer can be a personal computer, a server, or a network device, etc. The computer instructions can be stored in a computer-readable storage medium, or transmitted from one computer-readable storage medium to another computer-readable storage medium. For example, the computer instructions can be transmitted from a website, computer, server or data center to another website, computer, server or data center by wired (such as coaxial cable, optical fiber, digital subscriber line (DSL)) or wireless (such as infrared, wireless, microwave, etc.). About computer-readable storage media, reference can be made to the above description.

[0461] The above description is merely a specific embodiment of the present application, but the scope of protection of the present application is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in this application should be included in the scope of protection of this application. Therefore, the scope of protection of this application should be based on the scope of protection of the claims.

Claims

1. A communication method, characterized in that: include: Determine a first reference signal and a first message, wherein the first reference signal is used to determine a first beam, the first message is used by a second device to discover or request communication with the second communication device, the first beam is a candidate beam for communication between the first communication device and the second communication device, there is a first interval between the time domain resources of the first reference signal and the first message, the first interval is less than or equal to a first threshold, and the first threshold is configured or predefined; The first reference signal and the first message are sent.

2. The method according to claim 1, characterized in that The first reference signal is quasi co-located with the first message.

3. The method according to claim 1 or 2, characterized in that: The transmission resources of the first message are before the transmission resources of the second message, and the second message is used to indicate a reception status of the first reference signal.

4. The method according to claim 3, characterized in that The reception status of the first reference signal includes one or more of the following: whether the first reference signal is received by the second communication device, or the reception quality of the first reference signal, or, whether the reception quality of the first reference signal exceeds a threshold, or, Whether the reception quality of the first reference signal is the highest among the received reference signals.

5. The method according to any one of claims 1 to 4, characterized in that The first threshold is determined according to at least one of the priority of the first message, the priority of the to-be-transmitted service indicated by the first message, or the transmission delay margin.

6. The method according to any one of claims 1 to 5, characterized in that The sending period of the first reference signal is T1, and the sending period of the first message is T2, wherein T1 is an integer multiple of T2, or T2 is an integer multiple of T1, and T1 and T2 are positive integers.

7. The method according to any one of claims 1 to 6, characterized in that The first reference signal belongs to M reference signals, the first message belongs to M first messages, M is an integer greater than or equal to 1, Among the M reference signals, an interval between time domain resources of two adjacent reference signals is a second interval, and the second interval is configured or predefined; and / or, Among the M first messages, an interval between time domain resources of two adjacent first messages is a third interval, and the third interval is configured or predefined.

8. The method according to claim 7, characterized in that The second interval is the same as the third interval.

9. The method according to claim 1, characterized in that: The first reference signal occupies a first frequency domain resource subset, the first message occupies a second frequency domain resource subset, and the first frequency domain resource subset corresponds to the second frequency domain resource subset.

10. The method according to claim 9, characterized in that The first frequency domain resource subset and the second frequency domain resource subset correspond to: The frequency domain resource positions and sizes of the first frequency domain resource subset and the second frequency domain resource subset are the same; or, The center frequencies of the frequency domain resources of the first frequency domain resource subset and the second frequency domain resource subset are the same, and / or the frequency domain resources of the first frequency domain resource subset and the second frequency domain resource subset are the same in size; or, The center frequencies of the frequency domain resources of the first frequency domain resource subset and the second frequency domain resource subset are the same, and the size of the first frequency domain resource subset is less than or equal to the size of the frequency domain resources of the second frequency domain resource subset, or, The center frequencies of the frequency domain resources of the first frequency domain resource subset and the second frequency domain resource subset are the same, and the size of the second frequency domain resource subset is smaller than or equal to the size of the frequency domain resources of the first frequency domain resource subset.

11. The method according to claim 9 or 10, characterized in that: The first reference signal belongs to M reference signals, and the first message corresponding to the first reference signal belongs to M first messages, where M is an integer greater than or equal to 1, and the intervals between frequency domain resource subsets of any two adjacent reference signals in the frequency domain in the M reference signals are equal, and the intervals between frequency domain resource subsets of any two adjacent first messages in the frequency domain in the M first messages are equal.

12. The method according to any one of claims 1 to 11, characterized in that The first reference signal belongs to M reference signals, the first message corresponding to the first reference signal belongs to M first messages, M is an integer greater than or equal to 1, the M reference signals also include a second reference signal, the M first messages also include a first message corresponding to the second reference signal, there is a fourth interval between the time domain resources of the second reference signal and the first message corresponding to the second reference signal, and the fourth interval is the same as the first interval.

13. The method according to claim 9, characterized in that The first reference signal belongs to M reference signals, the first message corresponding to the first reference signal belongs to M first messages, at least two of the M first messages have different frequency domain resource subset positions and the same time domain resource positions, and at least two of the M reference signals have the same frequency domain resource subset positions and different time domain resource positions.

14. The method according to claim 13, characterized in that The first reference signal belongs to M reference signals, the first message belongs to M first messages, at least two of the M first messages have different frequency domain resource subset positions and the same time domain resource positions, and at least two of the M reference signals have the same frequency domain resource subset position and time domain resource position but different sequences.

15. The method according to claim 13 or 14, characterized in that The intervals between the frequency domain resource subsets of any two adjacent first messages in the M first messages in the frequency domain are equal.

16. The method according to any one of claims 13 to 15, characterized in that The sequence of the first reference signal is associated with the second frequency domain resource subset; or, The first reference signal includes first indication information, where the first indication information indicates an index of the second frequency domain resource subset.

17. The method according to claim 13, characterized in that The index of the time domain resource of the first reference signal is associated with the index of the second frequency domain resource subset.

18. The method according to claim 1, characterized in that The first reference signal is associated with a data channel carrying the first message, including: A first sequence used by a demodulation reference signal in the data channel is associated with the first reference signal; and / or, The bits of the first message are scrambled using a second sequence, the second sequence being associated with the first reference signal.

19. The method according to claim 18, characterized in that The first sequence is associated with the first reference signal, including: the first sequence or the second sequence is generated based on a first parameter, and the first parameter includes one or more of the following: an index of a time domain resource of the first reference signal; an index of a beam of the first reference signal; the first reference signal sequence identifier; The first reference signal includes a value indicated by control information.

20. The method according to any one of claims 1 to 19, characterized in that The method further comprises: Receive configuration information, the configuration information indicating at least one of the following: The type of the first reference signal, the first interval, the first threshold, the time-frequency resources of the first reference signal, the time-frequency resources of the first message, the sending period of the first reference signal, the number of times the first reference signal is sent, and the sending period of the first message.

21. A communication method, characterized in that: include: receiving a first reference signal and a first message, where the first message is used by a second communication device to discover or request communication with the second communication device, where a first interval exists between time domain resources of the first reference signal and the first message, where the first interval is less than or equal to a first threshold, and the first threshold is configured or predefined; A first beam is determined according to the first reference signal and the first message, where the first beam is a candidate beam for the first communication device to communicate with the second communication device.

22. The method according to claim 21, characterized in that The first reference signal is quasi co-located with the first message.

23. The method according to claim 21 or 22, characterized in that The method further comprises: It is determined whether to send a second message according to the first reference signal and the first message, where the second message is used to indicate a reception status of the first reference signal.

24. The method according to claim 23, characterized in that The reception status of the first reference signal includes one or more of the following: whether the second communication device receives the first reference signal, or the quality of the first reference signal received by the second communication device, or, whether the quality of the first reference signal received by the second communication device exceeds a threshold, or, Whether the quality of the first reference signal received by the second communication device is the highest among the M reference signals received by the second communication device.

25. The method according to any one of claims 21 to 24, characterized in that The first threshold is determined according to at least one of the priority of the first message, the priority of the to-be-transmitted service indicated by the first message, or the transmission delay margin.

26. The method according to any one of claims 21 to 25, characterized in that The sending period of the first reference signal is T1, and the sending period of the first message is T2, wherein T1 is an integer multiple of T2, or T2 is an integer multiple of T1, and T1 and T2 are positive integers.

27. The method according to any one of claims 21 to 26, characterized in that The first reference signal belongs to M reference signals, the first message belongs to M first messages, M is an integer greater than or equal to 1, Among the M reference signals, an interval between time domain resources of two adjacent reference signals is a second interval, and the second interval is configured or predefined; and / or, Among the M first messages, an interval between time domain resources of two adjacent first messages is a third interval, and the third interval is configured or predefined.

28. The method according to claim 27, characterized in that The second interval is the same as the third interval.

29. The method according to claim 21, characterized in that The first reference signal occupies a first frequency domain resource subset, the first message occupies a second frequency domain resource subset, and the first frequency domain resource subset corresponds to the second frequency domain resource subset.

30. The method according to claim 29, characterized in that The first frequency domain resource subset and the second frequency domain resource subset correspond to: The frequency domain resource positions and sizes of the first frequency domain resource subset and the second frequency domain resource subset are the same; or, The center frequencies of the frequency domain resources of the first frequency domain resource subset and the second frequency domain resource subset are the same, and / or the frequency domain resources of the first frequency domain resource subset and the second frequency domain resource subset are the same in size; or, The center frequencies of the frequency domain resources of the first frequency domain resource subset and the second frequency domain resource subset are the same, and the size of the first frequency domain resource subset is less than or equal to the size of the frequency domain resources of the second frequency domain resource subset, or, The center frequencies of the frequency domain resources of the first frequency domain resource subset and the second frequency domain resource subset are the same, and the size of the second frequency domain resource subset is smaller than or equal to the size of the frequency domain resources of the first frequency domain resource subset.

31. The method according to claim 29 or 30, characterized in that The first reference signal belongs to M reference signals, and the first message corresponding to the first reference signal belongs to M first messages, where M is an integer greater than or equal to 1, and the intervals between frequency domain resource subsets of any two adjacent reference signals in the frequency domain in the M reference signals are equal, and the intervals between frequency domain resource subsets of any two adjacent first messages in the frequency domain in the M first messages are equal.

32. The method according to any one of claims 21 to 31, characterized in that The first reference signal belongs to M reference signals, the first message corresponding to the first reference signal belongs to M first messages, M is an integer greater than or equal to 1, the M reference signals also include a second reference signal, the M first messages also include a first message corresponding to the second reference signal, there is a fourth interval between the time domain resources of the second reference signal and the first message corresponding to the second reference signal, and the fourth interval is the same as the first interval.

33. The method according to claim 29, characterized in that The first reference signal belongs to M reference signals, the first message belongs to M first messages, at least two of the M first messages have different frequency domain resource subset positions and the same time domain resource positions, and at least two of the M reference signals have the same frequency domain resource subset positions and different time domain resource positions.

34. The method according to claim 29, characterized in that The first reference signal belongs to M reference signals, the first message belongs to M first messages, at least two of the M first messages have different frequency domain resource subset positions and the same time domain resource positions, and at least two of the M reference signals have the same frequency domain resource subset position and time domain resource position but different sequences.

35. The method according to claim 33 or 34, characterized in that The intervals between the frequency domain resource subsets of any two adjacent first messages in the M first messages in the frequency domain are equal.

36. The method according to any one of claims 33 to 35, characterized in that The sequence of the first reference signal is associated with the second frequency domain resource subset; or, The first reference signal includes first indication information, where the first indication information indicates an index of the second frequency domain resource subset.

37. The method according to claim 33, characterized in that The index of the time domain resource of the first reference signal is associated with the index of the second frequency domain resource subset.

38. The method according to claim 21, characterized in that The first reference signal is associated with a data channel carrying the first message, including: A first sequence used by a demodulation reference signal in the data channel is associated with the first reference signal; and / or, The bits of the first message are scrambled using a second sequence, the second sequence being associated with the first reference signal.

39. The method according to claim 38, characterized in that The first sequence is associated with the first reference signal, including: the first sequence or the second sequence is generated based on a first parameter, and the first parameter includes one or more of the following: an index of a time domain resource of the first reference signal; an index of a beam of the first reference signal; the first reference signal sequence identifier; The first reference signal includes a value indicated by control information.

40. The method according to any one of claims 21 to 39, characterized in that The method further comprises: Receive configuration information, the configuration information indicating at least one of the following: The type of the first reference signal, the first interval, the first threshold, the time-frequency resources of the first reference signal, the time-frequency resources of the first message, the sending period of the first reference signal, the number of times the first reference signal is sent, and the sending period of the first message.

41. A communication device, characterized in that: The method comprises modules or units for executing the method according to any one of claims 1 to 40.

42. A communication device, characterized in that: The device comprises a processor, wherein the processor is configured to execute a computer program or instruction stored in a memory so that the device performs the method according to any one of claims 1 to 40.

43. The device according to claim 42, characterized in that The device further comprises the memory and / or the communication interface, wherein the communication interface is coupled to the processor. The communication interface is used to input and / or output information.

44. A computer-readable storage medium, characterized in that The computer-readable storage medium stores a computer program or instruction, and when the computer program or instruction is executed on a communication device, the communication device is caused to perform the method according to any one of claims 1 to 40.

45. A computer program product, characterized in that The computer program product comprises a computer program or instructions for performing the method according to any one of claims 1 to 40.

46. ​​A chip, characterized in that: The chip is coupled to a memory and is used to read and execute program instructions stored in the memory to implement the method according to any one of claims 1 to 40.

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