Sidelink communication method and apparatus

Abstract

Provided in the present application are a sidelink communication method and an apparatus. The method comprises: acquiring configuration information for indicating M frequency bands, at least one frequency band of the M frequency bands comprising at least one carrier; on the basis of load information of at least one frequency band of the M frequency bands, switching from the current working frequency band of a first terminal device to a first frequency band, or switching from the current working carrier to a first carrier in the first frequency band; and communicating with a second terminal device on the first frequency band or the first carrier in the first frequency band, the load information being used for indicating a channel state or channel usage information on at least one frequency band, the first frequency band being among the M frequency bands, and M being an integer greater than or equal to 1. The method disclosed in the present application can enable the first terminal device to adaptively switch to the first frequency band or the first carrier in the first frequency band used for communicating with the second terminal device, thereby ensuring data transmission between devices, and improving system transmission performance.

Description

Sideline communication method and device

[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 202311011310.9, and priority to the Chinese patent application entitled “Side Communication Method and Device”, all contents of which are incorporated by reference into this application. Technical Field

[0002] The present application relates to the field of communications, and more particularly, to a sideline communication method and apparatus. Background Art

[0003] In sidelink (SL) communication, the frequency band, sidelink carrier, or sidelink bandwidth portion used by the terminal device is usually fixed. Once the frequency band, sidelink carrier, or sidelink bandwidth portion is configured and takes effect, it usually does not change. For example, on a certain frequency band, or a carrier in a frequency band, or a portion of the bandwidth in a carrier, due to the transmission of more terminal devices, the load of the sidelink communication on the unlicensed spectrum may be saturated, while other frequency bands, or carriers in frequency bands, or portions of the bandwidth in a carrier are not used. However, the current protocol does not support terminal devices to adaptively switch to other frequency bands, or carriers in frequency bands, or portions of the bandwidth in a carrier, thereby affecting transmission performance.

[0004] Summary of the Invention

[0005] The present application provides a sideline communication method and apparatus, which enables a terminal device to adaptively switch to a first frequency band or a first carrier in a first frequency band for inter-device communication, thereby improving transmission performance.

[0006] In a first aspect, a communication method is provided. The method may be executed by a first terminal device, or may be executed by a chip or circuit for the first terminal device, although this application does not limit this. For ease of description, the following description is based on an example of execution by the first terminal device.

[0007] The method includes: obtaining configuration information, where the configuration information is used to indicate M frequency bands, at least one of the M frequency bands includes at least one carrier, and M is an integer greater than or equal to 1; switching from the current working frequency band of a first terminal device to a first frequency band, or switching from the current working carrier of the first terminal device to a first carrier in the first frequency band according to load information of at least one of the M frequency bands, where the load information is used to indicate channel state information or channel usage information on at least one frequency band, and the first frequency band is included in the M frequency bands; and communicating with a second terminal device on the first frequency band or the first carrier in the first frequency band.

[0008] Exemplarily, switching from the current working frequency band of the first terminal device to the first frequency band may be switching from band#1 to band#2; switching from the current working carrier of the first terminal device to the first carrier in the first frequency band may be switching from CC#1 in band#1 to CC#2 in band#1, or switching from CC#1 in band#1 to CC#2 in band#2. This application does not limit this.

[0009] Optionally, the frequency band involved in the embodiments of the present application may be an unlicensed frequency band, an intelligent transportation system (ITS) frequency band, or an authorized frequency band, and the present application does not impose any restrictions on this.

[0010] Optionally, the configuration information is predefined; or, the configuration information is configured or preconfigured; or, the configuration information is indicated by the network device through signaling.

[0011] It should be understood that this technical solution is applicable to sidelink communication scenarios or uplink communication scenarios, and is applicable to both authorized spectrum and unauthorized spectrum, and this application does not limit this.

[0012] Optionally, the first terminal device may also access the first frequency band or the first carrier in the first frequency band when it is turned on, that is, it is not limited to the switching scenario. In other words, in the technical solution of the present application, the first terminal device may switch from the current operating frequency band or operating carrier to the first frequency band or the first carrier in the first frequency band, or may access the first frequency band or the first carrier in the first frequency band when it is turned on for the first time.

[0013] According to the solution provided in the present application, the first terminal device obtains the configuration information of M frequency bands and the load information of at least one frequency band among the M frequency bands, and then determines to switch from the current working frequency band to the first frequency band, or from the current working carrier to the first carrier in the first frequency band, to avoid the current working frequency band or the current working carrier of the first terminal device affecting the transmission performance due to excessive load. That is to say, the first terminal device can adaptively switch to the first frequency band or the first carrier in the first frequency band according to the load information of at least one frequency band among the M frequency bands, to ensure normal communication with the second terminal device, improve the quality of communication, reduce transmission interruptions, and ensure system transmission performance.

[0014] In combination with the first aspect, in certain implementations of the first aspect, at least one carrier includes at least one bandwidth part, and communicating with the second terminal device on the first frequency band or the first carrier in the first frequency band includes: communicating with the second terminal device on the first bandwidth part in the first frequency band; or, communicating with the second terminal device on the second bandwidth part in the first carrier in the first frequency band; wherein the first bandwidth part or the second bandwidth part is included in at least one bandwidth part.

[0015] Based on this implementation, by defining a smaller frequency domain resource granularity, the first terminal device can communicate in the bandwidth part in the first frequency band, or communicate in the bandwidth part in the first carrier.

[0016] In conjunction with the first aspect, in certain implementations of the first aspect, the load information includes one or more of the following:

[0017] Channel busy ratio and / or channel occupancy ratio for unlicensed spectrum sidelink;

[0018] Channel busy ratio and / or channel occupancy ratio on a set of resource blocks;

[0019] Channel busy ratio and / or channel occupancy ratio in the resource pool;

[0020] Information on the quality of signals received on the frequency band and / or carrier and / or bandwidth part and / or resource pool, the signal quality information including: reference strength indicator, reference signal received power, reference signal received quality, channel quality indicator, signal-to-noise ratio and / or signal-to-interference-plus-noise ratio;

[0021] The number of radio link failures on the frequency band and / or carrier and / or bandwidth part and / or resource pool in the first time interval; or

[0022] Statistics of persistent listen-before-talk failures on the frequency band and / or carrier and / or bandwidth part and / or resource pool during the second time interval.

[0023] In combination with the first aspect, in certain implementations of the first aspect, at least one carrier includes a first carrier and a second carrier, the frequency domain resources occupied by the first carrier and the second carrier partially overlap, and the partially overlapping frequency domain resources include frequency domain resources for transmitting a first side synchronization signal block; or, at least one bandwidth part in at least one carrier includes a first bandwidth part and a second bandwidth part, the frequency domain resources occupied by the first bandwidth part and the second bandwidth part partially overlap, and the partially overlapping frequency domain resources include frequency domain resources for transmitting a second side synchronization signal block.

[0024] Based on this implementation method, the side synchronization signal block is set in the overlapping part of the frequency domain resources of the adjacent carrier or adjacent bandwidth part, so that the first terminal device can avoid synchronization adjustment when switching on the adjacent carrier or adjacent bandwidth part.

[0025] In combination with the first aspect, in certain implementations of the first aspect, at least one frequency band includes a second frequency band, and the second frequency band is used for communication between the first terminal device and the second terminal device when one or more of the following conditions are met: no indication information of the frequency band used for communication between the first terminal device and the second terminal device is received, no load information is obtained, the power-on state, or the switching of the first terminal device fails.

[0026] In combination with the first aspect, in certain implementations of the first aspect, at least one carrier in at least one frequency band includes a third carrier, and the third carrier is used for communication between the first terminal device and the second terminal device when one or more of the following conditions are met: no indication information of the frequency band used for communication between the first terminal device and the second terminal device is received, no load information is obtained, the device is in the power-on state, or the switching of the first terminal device fails.

[0027] In combination with the first aspect, in certain implementations of the first aspect, at least one bandwidth part in at least one carrier includes a third bandwidth part, and the third bandwidth part is used for the first terminal device to communicate with the second terminal device when one or more of the following conditions are met: when no indication information of the frequency band used for communication between the first terminal device and the second terminal device is received, no load information is obtained, the power-on state, or the switching of the first terminal device fails.

[0028] In the embodiment of the present application, the second frequency band may be referred to as a default frequency band, the third carrier may be referred to as a default carrier, and the third bandwidth part may be referred to as a default bandwidth part.

[0029] Optionally, the default carrier may be on a default frequency band or a non-default frequency band, and the default bandwidth portion may be on a default carrier or a non-default carrier, which is not limited in this application.

[0030] Based on this implementation method, the default frequency band, default carrier, and default bandwidth part are defined, so that when no indication information of the frequency band used for communication between the first terminal device and the second terminal device is received, no load information is obtained, the power-on state, or the switching of the first terminal device fails, the first terminal device can communicate normally with the second terminal device on the default frequency band, default carrier, and default bandwidth part, thereby ensuring the system transmission performance.

[0031] In combination with the first aspect, in certain implementations of the first aspect, switching from the current working frequency band of the first terminal device to the first frequency band, or switching from the current working carrier of the first terminal device to the first carrier in the first frequency band, based on the load information of at least one frequency band among the M frequency bands, includes: measuring the load information of at least one frequency band among the M frequency bands to obtain a first measurement result; switching from the current working frequency band of the first terminal device to the first frequency band based on the first measurement result, or switching from the current working carrier of the first terminal device to the first carrier of the first frequency band based on the first measurement result.

[0032] It should be understood that measuring the load information of at least one frequency band among the M frequency bands includes: measuring the load information of at least one frequency band, and / or measuring the load information of at least one carrier in at least one frequency band among the M frequency bands; and / or measuring the load information of at least one bandwidth part in at least one frequency band.

[0033] That is to say, the first terminal device can independently measure the load information on one or more frequency bands among the M frequency bands based on the obtained configuration information of the M frequency bands to obtain the first measurement result.

[0034] In combination with the first aspect, in some implementations of the first aspect, measuring the load information of at least one frequency band among the M frequency bands includes: measuring the load information of at least one frequency band among the M frequency bands according to configuration information.

[0035] In combination with the first aspect, in certain implementations of the first aspect, at least one or more of the following are included: according to the first measurement configuration information, the load information of M1 frequency bands among the M frequency bands is measured, and the M1 frequency band is determined according to the first measurement configuration information; or, according to the second measurement configuration information, the load information of M2 carriers in the M1 frequency band among the M frequency bands is measured, and the M1 frequency band and the M2 carrier are determined according to the second measurement configuration information; according to the third measurement configuration information, the load information of M3 bandwidth parts in the M2 carriers in the M1 frequency band among the M frequency bands is measured, and the M1 frequency band, the M2 carrier and the M3 bandwidth part are determined according to the third measurement configuration information; wherein, M1 is an integer greater than or equal to 1 and less than or equal to M, and M2 and M3 are integers greater than or equal to 1.

[0036] Optionally, the measurement configuration information may include one or more of the following: the frequency band and / or carrier and / or bandwidth part that the first terminal device is expected to measure, or one or more load information on the frequency band and / or carrier and / or bandwidth part, such as the frequency position or frequency position index for indicating the frequency band and / or carrier and / or bandwidth part, and the channel busy ratio and / or signal-to-noise ratio that the corresponding network device expects the first terminal device to measure on the frequency band and / or carrier and / or bandwidth part.

[0037] Optionally, the measurement configuration information can be indicated by the network device through resource control signaling, and correspondingly, the first terminal device can measure the load information in a targeted manner based on the measurement configuration information. Compared with the implementation method in which the first terminal device autonomously measures the configuration information of M frequency bands, the first terminal device can effectively save energy.

[0038] Optionally, the measurement configuration information may be configured to the first terminal device together with the above configuration information, or may be configured independently.

[0039] In combination with the first aspect, in certain implementations of the first aspect, before switching from the current working frequency band of the first terminal device to the first frequency band, or switching from the current working carrier of the first terminal device to the first carrier in the first frequency band based on the load information of at least one frequency band among the M frequency bands, the method also includes: receiving load information of at least one frequency band among the M frequency bands.

[0040] In combination with the first aspect, in certain implementations of the first aspect, a first measurement result is sent; after sending the first measurement result, switching indication information is received, and the switching indication information is used to indicate switching from the current working frequency band of the first terminal device to the first frequency band, or switching from the current working carrier of the first terminal device to the first carrier in the first frequency band; wherein, according to the load information of at least one frequency band among the M frequency bands, switching from the current working frequency band of the first terminal device to the first frequency band, or switching from the current working carrier of the first terminal device to the first carrier in the first frequency band, includes: according to the switching indication information, switching from the current working frequency band of the first terminal device to the first frequency band, or switching from the current working carrier of the first terminal device to the first carrier in the first frequency band.

[0041] Based on this implementation method, by reporting the first measurement result and obtaining switching indication information, the first terminal device can switch from the current working frequency band of the first terminal device to the first frequency band, or switch from the current working carrier of the first terminal device to the first carrier in the first frequency band, ensuring that communication with the second terminal device can proceed normally and ensuring data transmission between devices.

[0042] In combination with the first aspect, in certain implementations of the first aspect, before communicating with the second terminal device on the first frequency band or the first carrier in the first frequency band, the method also includes: switching from the second frequency band to the first frequency band according to the switching indication information; and / or, switching from the third carrier to the first carrier in the first frequency band according to the switching indication information; and / or, switching from the third bandwidth part to the first bandwidth part in the first carrier according to the switching indication information.

[0043] Based on this implementation, after receiving the switching indication information, the first terminal device can switch from the default frequency band and / or the default carrier and / or the default bandwidth part to the first frequency band, and / or the first carrier in the first frequency band, and / or the first bandwidth part in the first carrier. Optionally, the first terminal device can also switch from the non-default frequency band and / or the default carrier and / or the default bandwidth part to the first frequency band, and / or the first carrier in the first frequency band, and / or the first bandwidth part in the first carrier. That is to say, this application does not limit the frequency position or size of the current working frequency band, current working carrier, and current working bandwidth part of the first terminal device.

[0044] In combination with the first aspect, in certain implementations of the first aspect, the time domain resources occupied by each carrier include a first time unit and a second time unit, and the load information of at least one of the M frequency bands is measured, including: within the second time unit, measuring the load information on at least one of the M frequency bands, wherein the first time unit is used for communication between the first terminal device and the second terminal device, the first time unit is different from the second time unit, and the first time unit and / or the second time unit are signaling configured or predefined.

[0045] Based on this implementation, the first terminal device can communicate in the first time unit and measure load information on other frequency bands and / or carriers and / or bandwidth portions in the second time unit. It should be understood that during the process of measuring load information on other frequency bands and / or carriers and / or bandwidth portions in the second time unit, normal data transmission cannot be performed.

[0046] In combination with the first aspect, in certain implementations of the first aspect, when the load information on the current working frequency band of the first terminal device is greater than a first threshold, a first switching request message is sent, and the first switching request message is used to request switching from the current working frequency band of the first terminal device to the first frequency band; or, when the load information on the current working carrier of the first terminal device is greater than a second threshold, a second switching request message is sent, and the second switching request message is used to request switching from the current working carrier of the first terminal device to the first carrier in the first frequency band.

[0047] Optionally, when a difference between load information of a current operating frequency band of the first terminal device and load information of a best candidate frequency band exceeds a preset threshold, a first switching request message is sent. Optionally, this implementation is also applicable to sending a first switching request message when load information on a current operating carrier and / or bandwidth portion of the first terminal device is greater than a first threshold.

[0048] Based on this implementation method, when the first terminal device determines that the load information on the current working frequency band is greater than the first threshold, it can send a switching request message to other devices to request switching to other idle frequency bands and / or carriers and / or bandwidth parts to ensure normal communication with the second terminal device and improve system transmission performance.

[0049] In combination with the first aspect, in certain implementations of the first aspect, communicating with the second terminal device on the first frequency band or the first carrier in the first frequency band includes: transmitting data with the second terminal device on the first frequency band or the first carrier in the first frequency band when a first switching request message or a second switching request message has been sent or a switching response message has been received, the switching response message being used to indicate approval of the switching request of the first terminal device.

[0050] Based on this implementation method, after the first terminal device has sent a switching request message or received a switching response message, it can transmit data with the second terminal device on the first frequency band or the first carrier in the first frequency band, ensuring normal communication between the first terminal device and the second terminal device and improving the system transmission performance.

[0051] In combination with the first aspect, in certain implementations of the first aspect, when the current operating frequency band of the first terminal device is not the second frequency band, first indication information is sent on the second frequency band, or the third carrier, or the third bandwidth part, and the first indication information is used to indicate one or more of the following: the frequency and / or bandwidth of the current operating frequency band of the first terminal device, the identifier of the first terminal device, the identifier of the second terminal device, or the load information of the current operating frequency band of the first terminal device.

[0052] In combination with the first aspect, in certain implementations of the first aspect, when the current working carrier of the first terminal device is not the third carrier, second indication information is sent on the second frequency band, or the third carrier, or the third bandwidth part, and the second indication information is used to indicate one or more of the following: the frequency and / or bandwidth of the current working carrier of the first terminal device, the identifier of the first terminal device, the identifier of the second terminal device, or the load information of the current working frequency band of the first terminal device.

[0053] In combination with the first aspect, in certain implementations of the first aspect, when the current working carrier of the first terminal device is not the third bandwidth part, third indication information is sent on the second frequency band, or the third carrier, or the third bandwidth part, and the third indication information is used to indicate one or more of the following: the frequency and / or bandwidth of the current working bandwidth part of the first terminal device, the identifier of the first terminal device, the identifier of the second terminal device, or the load information of the current working frequency band part of the first terminal device.

[0054] Exemplarily, the non-default frequency band may be one or more frequency bands other than the default frequency band among the M frequency bands, the non-default carrier may be one or more carriers other than the default carrier among multiple carriers, and the non-default bandwidth part may be one or more default bandwidth parts other than the default bandwidth part among multiple default bandwidth parts.

[0055] Based on this implementation method, when the first terminal device communicates with the second terminal device on a non-default frequency band, a non-default carrier, and a non-default bandwidth part, the first terminal device can indicate the terminal device identification, channel occupancy information, and load information on the frequency band and / or carrier and / or bandwidth part on which the first terminal device is currently actually working, on the default frequency band, default carrier, and default bandwidth part, so that the network device and / or other terminal devices can promptly know the relevant information on the frequency band and / or carrier and / or bandwidth part on which the first terminal device is currently actually working, and make targeted adjustments or switches to the frequency band and / or carrier and / or bandwidth part to ensure data transmission between devices.

[0056] In a second aspect, a communication method is provided, which can be executed by a network device, or by a chip or circuit used in the network device, which is not limited in this application. For ease of description, the following description is based on an example of execution by a network device.

[0057] The method includes: receiving a first measurement result, where the first measurement result is determined by measuring load information of at least one frequency band among M frequency bands, where at least one frequency band among the M frequency bands includes at least one carrier, and M is an integer greater than or equal to 1; sending a second measurement result or switching indication information, where the second measurement result and the switching indication information are determined based on the first measurement result, and the switching indication information is used to indicate switching from the current working frequency band of the first terminal device to the first frequency band, or switching from the current working carrier of the first terminal device to the first carrier in the first frequency band.

[0058] According to the solution provided in the present application, the network device sends a second measurement result or switching indication information to enable the first terminal device to determine to switch from the current working frequency band to the first frequency band, or from the current working carrier to the first carrier in the first frequency band, so as to avoid the current working frequency band or the current working carrier of the first terminal device being affected by the transmission performance due to excessive load. That is to say, the first terminal device can adaptively switch to the first frequency band or the first carrier in the first frequency band according to the load information of at least one frequency band among the M frequency bands, thereby ensuring normal communication with the second terminal device, improving the quality of communication, reducing transmission interruptions, and ensuring system transmission performance.

[0059] In conjunction with the second aspect, in certain implementations of the second aspect, the load information includes one or more of the following:

[0060] Channel busy ratio and / or channel occupancy ratio for unlicensed spectrum sidelink;

[0061] Channel busy ratio and / or channel occupancy ratio on a set of resource blocks;

[0062] Channel busy ratio and / or channel occupancy ratio in the resource pool;

[0063] Information on the quality of signals received on the frequency band and / or carrier and / or bandwidth part and / or resource pool, the signal quality information including: reference strength indicator, reference signal received power, reference signal received quality, channel quality indicator, signal-to-noise ratio and / or signal-to-interference-plus-noise ratio;

[0064] The number of radio link failures on the frequency band and / or carrier and / or bandwidth part and / or resource pool in the first time interval; or

[0065] Statistics of persistent listen-before-talk failures on the frequency band and / or carrier and / or bandwidth part and / or resource pool during the second time interval.

[0066] In combination with the second aspect, in certain implementations of the second aspect, at least one carrier includes a first carrier and a second carrier, the frequency domain resources occupied by the first carrier and the second carrier partially overlap, and the partially overlapping frequency domain resources include frequency domain resources for transmitting a first side synchronization signal block; or, at least one bandwidth part in at least one carrier includes a first bandwidth part and a second bandwidth part, the frequency domain resources occupied by the first bandwidth part and the second bandwidth part partially overlap, and the partially overlapping frequency domain resources include frequency domain resources for transmitting a second side synchronization signal block.

[0067] In combination with the second aspect, in certain implementations of the second aspect, at least one frequency band includes a second frequency band, and the second frequency band is used for communication between the first terminal device and the second terminal device when one or more of the following conditions are met: no indication information of the frequency band used for communication between the first terminal device and the second terminal device is received, no load information is obtained, the power-on state, or the switching of the first terminal device fails.

[0068] In combination with the second aspect, in certain implementations of the second aspect, at least one carrier in at least one frequency band includes a third carrier, and the third carrier is used for communication between the first terminal device and the second terminal device when one or more of the following conditions are met: no indication information of the frequency band used for communication between the first terminal device and the second terminal device is received, no load information is obtained, the device is in the power-on state, or the switching of the first terminal device fails.

[0069] In combination with the second aspect, in certain implementations of the second aspect, at least one bandwidth part in at least one carrier includes a third bandwidth part, and the third bandwidth part is used for the first terminal device to communicate with the second terminal device when one or more of the following conditions are met: when no indication information of the frequency band used for communication between the first terminal device and the second terminal device is received, no load information is obtained, the power-on state, or the switching of the first terminal device fails.

[0070] In combination with the second aspect, in certain implementations of the second aspect, first measurement configuration information is sent, and the first measurement configuration information is used to indicate the measurement of load information of M1 frequency bands among M frequency bands; or, second measurement configuration information is sent, and the second measurement configuration information is used to indicate the measurement of load information of M2 carriers in M1 frequency bands among M frequency bands; and third measurement configuration information is sent, and the third measurement configuration information is used to indicate the measurement of load information of M3 bandwidth parts in M2 carriers in M1 frequency bands among M frequency bands; wherein M1 is an integer greater than or equal to 1 and less than or equal to M, and M2 and M3 are integers greater than or equal to 1.

[0071] In combination with the second aspect, in some implementations of the second aspect, before receiving the first measurement result, the method further includes: sending load information of at least one frequency band among the M frequency bands.

[0072] In combination with the second aspect, in certain implementations of the second aspect, when the current operating frequency band of the first terminal device is not the second frequency band, first indication information is received on the second frequency band, or the third carrier, or the third bandwidth part, where the first indication information is used to indicate one or more of the following: the frequency and / or bandwidth of the current operating frequency band of the first terminal device, the identifier of the first terminal device, the identifier of the second terminal device, or the load information of the current operating frequency band of the first terminal device; and / or,

[0073] In combination with the second aspect, in certain implementations of the second aspect, when the current operating carrier of the first terminal device is not the third carrier, second indication information is received on the second frequency band, or the third carrier, or the third bandwidth part, where the second indication information is used to indicate one or more of the following: the frequency and / or bandwidth of the current operating carrier of the first terminal device, the identifier of the first terminal device, the identifier of the second terminal device, or the load information of the current operating frequency band of the first terminal device; and / or,

[0074] In combination with the second aspect, in certain implementations of the second aspect, when the current working carrier of the first terminal device is not the third bandwidth part, third indication information is received on the second frequency band, or the third carrier, or the third bandwidth part, and the third indication information is used to indicate one or more of the following: the frequency and / or bandwidth of the current working bandwidth part of the first terminal device, the identifier of the first terminal device, the identifier of the second terminal device, or the load information of the current working frequency band part of the first terminal device.

[0075] The beneficial effects of the above-mentioned second aspect and certain implementation methods of the second aspect can be referred to the corresponding description of the first aspect, and will not be repeated here.

[0076] According to a third aspect, a communication device is provided, including: a processing unit for obtaining configuration information, the configuration information being used to indicate M frequency bands, at least one of the M frequency bands including at least one carrier, and M being an integer greater than or equal to 1; the processing unit being further used to switch from the current working frequency band of the first terminal device to the first frequency band, or from the current working carrier of the first terminal device to the first carrier in the first frequency band, based on load information of at least one of the M frequency bands, the load information being used to indicate channel state information or channel usage information on at least one frequency band, the first frequency band being included in the M frequency bands; and a transceiver unit for communicating with the second terminal device on the first frequency band or the first carrier in the first frequency band.

[0077] The transceiver unit can perform the reception and transmission processing in the aforementioned first aspect, and the processing unit can perform other processing except reception and transmission in the aforementioned first aspect.

[0078] In a fourth aspect, a communication device is provided, including: a transceiver unit, used to receive a first measurement result, the first measurement result is determined by measuring the load information of at least one frequency band among M frequency bands, at least one frequency band among the M frequency bands includes at least one carrier, and M is an integer greater than or equal to 1; the transceiver unit is also used to send a second measurement result or switching indication information, the second measurement result and the switching indication information are determined based on the first measurement result, and the switching indication information is used to indicate switching from the current working frequency band of the first terminal device to the first frequency band, or switching from the current working carrier of the first terminal device to the first carrier in the first frequency band.

[0079] The transceiver unit can perform the reception and transmission processing in the aforementioned second aspect, and the processing unit can perform other processing except reception and transmission in the aforementioned second aspect.

[0080] In a fifth aspect, a communication device is provided, comprising a transceiver, a processor and a memory, wherein the processor is used to control the transceiver to transmit and receive signals, the memory is used to store a computer program, and the processor is used to call and run the computer program from the memory, so that the communication device executes the method in any possible implementation of the first aspect or the second aspect mentioned above.

[0081] Optionally, there are one or more processors and one or more memories.

[0082] Optionally, the memory may be integrated with the processor, or the memory may be provided separately from the processor.

[0083] Optionally, the communication device further includes a transmitter (transmitter) and a receiver (receiver).

[0084] In the sixth aspect, a communication system is provided, comprising a first terminal device and a network device; the first terminal device is used to execute the method in any possible implementation of the above-mentioned first aspect, and the network device is used to execute the method in any possible implementation of the above-mentioned second aspect.

[0085] In the seventh aspect, a computer-readable storage medium is provided, which stores a computer program or code. When the computer program or code is run on a computer, the computer executes the method in any possible implementation of the first aspect or the second aspect above.

[0086] In the eighth aspect, a chip is provided, comprising at least one processor, wherein the at least one processor is coupled to a memory, the memory being used to store a computer program, and the processor being used to call and run the computer program from the memory, so that a device equipped with the chip system executes the method in any possible implementation of the first or second aspect above.

[0087] The chip may include an input circuit or interface for sending information or data, and an output circuit or interface for receiving information or data.

[0088] In a ninth aspect, a computer program product is provided, comprising: a computer program code, which, when executed on a communication device, enables the device to execute a method in any possible implementation of the first or second aspect. BRIEF DESCRIPTION OF THE DRAWINGS

[0089] FIG1 is a schematic diagram of a wireless communication system applicable to an embodiment of the present application.

[0090] FIG2 is a flow chart of a communication method 200 provided in an embodiment of the present application.

[0091] FIG3 is a schematic diagram of configuring different carriers on the FR1 frequency band provided in an embodiment of the present application.

[0092] FIG4 is a schematic diagram of a time window provided in an embodiment of the present application.

[0093] FIG5 is a schematic structural diagram of a communication device 1000 provided in an embodiment of the present application.

[0094] FIG6 is a schematic structural diagram of a communication device 2000 provided in an embodiment of the present application.

[0095] FIG7 is a schematic structural diagram of a chip system 3000 provided in an embodiment of the present application. DETAILED DESCRIPTION

[0096] The technical solutions in the embodiments of the present application will be described below with reference to the accompanying drawings.

[0097] 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.

[0098] 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.

[0099] 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.

[0100] The terminal device can be a device that provides voice / data to users, for example, a handheld device or vehicle-mounted device with a wireless connection function. At present, some examples of terminals are: mobile phones, tablet computers, laptop computers, PDAs, mobile internet devices (MIDs), wearable devices, virtual reality (VR) devices, augmented reality (AR) devices, wireless terminals in industrial control, wireless terminals in self-driving, wireless terminals in remote medical surgery, wireless terminals in smart grids, wireless terminals in transportation safety, wireless terminals in smart cities, wireless terminals in smart homes, cellular phones, cordless phones, session initiation protocol (SIP) phones, wireless local loop (WLL) stations, personal digital assistants (PDAs), handheld devices with wireless communication capabilities, computing devices or other processing devices connected to wireless modems, wearable devices, terminal devices in 5G networks or future evolved public land mobile communication networks (PLMNs). The terminal equipment in the network (PLMN), etc., is not limited to this in the embodiments of the present application.

[0101] As an example and not a limitation, in the embodiment of the present application, the terminal device may also be a wearable device. Wearable devices may also be called wearable smart devices, which are a general term for wearable devices that are intelligently designed and developed using wearable technology for daily wear, 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 clothes or accessories. Wearable devices are not only hardware devices, but also achieve powerful functions through software support, data interaction, and cloud interaction. Broadly speaking, wearable smart devices include those that are fully functional, large in size, and can achieve complete or partial functions without relying on smartphones, such as smart watches or smart glasses, as well as those that only focus on a certain type of application function and need to be used in conjunction with other devices such as smartphones, such as various smart bracelets and smart jewelry for vital sign monitoring.

[0102] In the embodiments of the present application, the device for implementing the function of the terminal device, i.e., the terminal device, can be the terminal device, or a device capable of supporting the terminal device to implement the function, such as a chip system or chip, which can be installed in the terminal 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.

[0103] The network device in the embodiments of the present application may be a device for communicating with a terminal device, and 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 embodiments of the present application may refer to a radio access network (RAN) node (or device) that connects a terminal device to a wireless network. A base station may broadly cover various names as follows, or replace 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 station, secondary station, multi-standard radio (motor slide retainer, 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 network equipment.

[0104] 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.

[0105] 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.

[0106] In the embodiments of the present application, the apparatus for implementing the function of the network device can be the network device, or it can be an apparatus 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 it can include a chip and other discrete devices.

[0107] The network equipment and terminal devices can be deployed on land, including indoors or outdoors, handheld or vehicle-mounted; they can also be deployed on water; they 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 equipment and terminal devices are located.

[0108] It should be noted that the technical solution of the present application is mainly used in side transmission scenarios, and the frequency bands used include but are not limited to unlicensed spectrum, which includes frequency bands near 2.4 GHz and frequency bands near 5.8 GHz. In an embodiment of the present application, the terminal device and the access network device can use unlicensed spectrum resources for wireless communication (for example, transmitting uplink information or transmitting downlink information). The communication system can adopt licensed-assisted access (LAA), dual connectivity (DC), unlicensed assisted access (standalone) technology, etc.

[0109] The following briefly introduces a communication system applicable to an embodiment of the present application in conjunction with FIG1 , as follows.

[0110] Figure 1 is a schematic diagram of a wireless communication system applicable to an embodiment of the present application. As shown in Figure 1, the wireless communication system may include at least one terminal device, such as UE1, UE2, and UE3 shown in Figure 1. Optionally, the wireless communication system may also include at least one network device, such as the network device shown in Figure 1.

[0111] 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 (a) in Figure 1, the network device and UE1 can communicate directly, and as shown in (b) in Figure 1, 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.

[0112] Terminal devices can also communicate with each other. For example, terminal devices can communicate directly with each other, as shown in (a) to (c) in Figure 1, 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 (a) in Figure 1, UE1 and UE2 can communicate through network devices, and as shown in (d) in Figure 1, 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 link for communication between terminal devices can be recorded as a side link SL, and the communication between terminal devices can also be recorded as SL communication. The side link can also be called an edge link or a side link, etc. It can be understood that the side link represents a connection relationship between terminal devices and terminal devices, and is a logical concept, not a physical entity. The side link is only a name for distinction, and its specific name does not limit the scope of protection of this application.

[0113] 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.

[0114] Optionally, SL communication between terminal devices can be performed under network coverage or without network coverage. As shown in (a) to (b) of Figure 1, UE1 and other UEs can communicate under network coverage; or, as shown in (c) to (d) of Figure 1, UE1 and other UEs can communicate outside network coverage (out-of-coverage).

[0115] Optionally, the configuration information during SL communication between terminal devices, such as the time and 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.

[0116] It is understood that Figure 1 is merely a simplified schematic diagram for ease of understanding, and the wireless communication system may further include other network devices or other terminal devices, which are not shown in Figure 1. The embodiments of the present application may be applicable to any communication scenario in which a transmitting device and a receiving device communicate.

[0117] It should be noted that the embodiments of the present application do not specifically limit the specific structure of the execution subject of the method provided in the embodiments of the present application. As long as it is possible to communicate according to the method provided in the embodiments of the present application by running a program that records the code of the method provided in the embodiments of the present application, for example, the execution subject of the method provided in the embodiments of the present application can be a terminal device, or a functional module in the terminal device that can call and execute the program.

[0118] To facilitate understanding of the embodiments of the present application, a brief description of the terms or technologies involved in the present application is first given.

[0119] (1) Licensed and unlicensed spectrum

[0120] The spectrum used by wireless communication systems is divided into two categories: licensed spectrum and unlicensed spectrum. In licensed spectrum, UEs can use spectrum resources based on scheduling by network devices. In unlicensed spectrum, communication devices can use spectrum resources in a competitive manner. Unlicensed spectrum is also called shared spectrum. SL communication on unlicensed spectrum can be called sidelink unlicensed (SLU), and NR cellular communication on unlicensed spectrum can be called NR-U. The bandwidth of unlicensed spectrum is a set of defined frequencies, which may vary slightly in different regions and countries due to policy and regulatory requirements. For example, unlicensed spectrum includes 900 MHz (such as all or part of 839–928 MHz), 2.4 GHz (such as all or part of 2401–2495 MHz), 3.6 GHz (such as all or part of 3655–3695 MHz), 5 GHz (such as all or part of 5030–5990 MHz), or 6 GHz (such as all or part of 5945–7115 MHz).

[0121] Currently, 3GPP has defined two frequency bands associated with V2X: n38 (2570MHz–2620MHz) and n47 (5855MHz–5925MHz). The n38 band, when used to support V2X SL services, is dedicated to NR V2X in a specific area. The n47 band, commonly known as the Intelligent Transportation System (ITS) band, currently has no network equipment deployed.

[0122] In addition to the two frequency bands mentioned above, R18 is currently conducting research on SL system technologies in shared spectrum, including the n46, n96, and n102 frequency bands. In this shared frequency band, due to the presence of various types of terminal devices, to avoid collisions and interference between different users, the transmitting node needs to use spectrum resources in a competitive manner, for example, by competing for the channel through the listen-before-talk (LBT) method. Before accessing the channel and starting to send data, the UE needs to detect whether the channel is idle. If the channel has been idle for a certain period of time, it can occupy the channel. If the channel is not idle, it needs to wait for the channel to become idle again before occupying the channel.

[0123] (2) Sidelink SLU in unlicensed spectrum

[0124] SLU primarily refers to SL transmission in unlicensed spectrum. For unlicensed spectrum, the standard introduces two access mechanisms: Type 1 and Type 2. Type 1 is used in channel preemption scenarios and requires LBT, meaning that monitoring is required before transmission. Monitoring here can be energy detection, which detects energy over 9μs. If the energy exceeds the threshold, it indicates that a UE is occupying the resource; conversely, if the energy does not exceed the threshold, it means that no UE is occupying the resource. Type 2 is used to share transmission resources that other UEs have seized using Type 1. For example, if UE1 seizes a transmission opportunity for a period of time, such as a COT, using Type 1, it can instruct other UEs to access the remaining transmission opportunities within the COT occupied by UE1 using Type 2, in addition to the transmission time it occupies.

[0125] It should be noted that Type 2 further includes Type 2A and Type 2B. Type 2A means that the channel is occupied 25μs after the end of other UE transmission. That is, if the channel is detected by sensing the channel and no other UE is using it within 25μs, it can occupy the channel. Type 2B means that the channel is occupied 16μs after the end of other UE transmission. The difference from Type 2A is that the duration of a sensing slot is 9μs.

[0126] (3) SL Resource Pool

[0127] In NR, SL transmission is based on resource pools. Each resource pool contains one or more subchannels. The frequency domain resources (i.e., the number of physical resource blocks (PRBs)) occupied by each subchannel in the same resource pool are the same, while the frequency domain resources occupied by each subchannel in different resource pools may be different.

[0128] Optionally, the resource pool may further include the location and number of time slots occupied for SL transmission in the time domain.

[0129] It should be noted that in the embodiment of the present application, the method of determining resources in the resource selection window can be performed on one resource pool or on multiple resource pools, and the present application does not impose any restrictions on this.

[0130] It should be understood that a resource pool can be a physical or logical concept. A resource pool includes multiple physical resources, any of which is used to transmit data. Each UE needs to select a resource from the resource pool when transmitting data. This resource determination process includes the following two situations:

[0131] Mode 1: The UE is controlled by the network device and selects a resource from the resource pool for data transmission based on the instructions of the network device.

[0132] Second, the UE autonomously selects a resource from the resource pool for data transmission. This is also known as Mode 2. This means the UE has the opportunity to independently determine resource allocation. Based on the perceived spectrum occupancy, the UE can exclude occupied or heavily interfered resources and select idle or less-interfered resources for transmission.

[0133] (4) Time domain unit and frequency domain unit

[0134] Data or information can be carried through time-frequency resources.

[0135] In the time domain, the time domain resource may include one or more time domain units (or may also be referred to as time units).

[0136] In an embodiment of the present application, a time unit may include several time domain resources. The time domain unit is, for example, a radio frame (RF), and the time domain resources included in the time domain unit are, for example, a subframe, a frame, a half subframe or a half frame, a slot, a mini-slot, a partial slot, or an orthogonal frequency division multiplexing (OFDM) symbol, etc. Alternatively, the time domain unit may also be a collection of one or more time domain resources, for example, the time domain unit is one or more OFDM symbols in a time slot, for example, the number of the one or more is 6, 7, 12 or 14, etc. One or more time units may be continuous or discrete in time.

[0137] In addition, the duration of a time slot can be related to the sub-carrier space (SCS) spacing. For example, when the sub-carrier spacing is 15 kHz, the duration of a time slot is 1 millisecond (ms); when the sub-carrier spacing is 30 kHz, the duration of a time slot is 0.5 ms; when the sub-carrier spacing is 60 kHz, the duration of a time slot is 0.25 ms. Similarly, when the sub-carrier spacing is 15*2u kHz, the duration of a time slot is 2-u ms, where u = 0, 1, 2, ...

[0138] In the frequency domain, frequency domain 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 resource pool, a bandwidth, a bandwidth part (BWP), a carrier (CC), a channel, or an interlace RB, etc.

[0139] (5) Sidelink-synchronization signal block (S-SSB)

[0140] Synchronous communication requires that the sender and receiver have synchronous clock signals with the same frequency and phase, or timing information. Through some means, such as SSB in NR communication, the sender and receiver establish synchronization, and then send / receive under the control of the synchronous clock. This application is applicable to sidelink communication scenarios, so the synchronization signals mentioned below are all S-SSBs. In this application, S-SSB can be called a synchronization signal or a synchronization signal block, etc. It should be understood that the name of S-SSB is only an example and does not constitute any limitation on the technical solution of this application. Optionally, S-SSB includes: a sidelink primary synchronization signal S-PSS, a sidelink slave synchronization signal S-SSS, and a physical sidelink broadcast channel PSBCH. Optionally, the bandwidth of the S-SSB is predefined, configured, or preconfigured. For example, its bandwidth is 11PRBs, or its maximum bandwidth is 20PRBs. Optionally, the number of symbols occupied by the S-SSB is also predefined, configured, or preconfigured. For example, for a normal CP, the S-SSB may occupy 13 symbols, and for an extended CP, the S-SSB may occupy 13 symbols. For another example, regardless of whether the CP is normal or extended, the S-SSB occupies 4 symbols. Optionally, the S-SSB may also include symbols for automatic gain control (AGC).

[0141] The above briefly describes the terms involved in this application, which will not be repeated in the following embodiments. In addition, the above description of terms is only for ease of understanding and does not limit the scope of protection of the embodiments of this application.

[0142] In SL communications, the sidelink carrier CC and sidelink bandwidth portion BWP used by the UE are usually fixed. Once the CC or BWP is configured and takes effect, it is generally difficult for network equipment to re-modify these configurations. In addition, there is no suitable mechanism to modify these configurations in scenarios outside the network. Considering that the current R18SLU does not support CC or BWP switching, once the carrier or BWP is configured, it usually does not change. For example, assuming that a certain frequency band (or carrier or part of the bandwidth in the frequency band) is saturated with SLU load due to the transmission needs of more users, while other frequency bands are not used, the SLU cannot adaptively switch to other unused frequency bands, which affects the transmission performance.

[0143] In view of this, the present application provides a side communication method and device, in which the first terminal device obtains the configuration information of M frequency bands and the load information of at least one frequency band among the M frequency bands, and then determines to switch from the current working frequency band to the first frequency band, or from the current working carrier to the first carrier in the first frequency band, to avoid the current working frequency band or current working carrier of the first terminal device affecting the transmission performance due to excessive load. That is, the first terminal device can adaptively switch to the first frequency band or the first carrier in the first frequency band according to the load information of at least one frequency band among the M frequency bands, to ensure normal communication with the second terminal device and improve transmission performance.

[0144] To facilitate understanding of the embodiments of the present application, the following points are explained:

[0145] (1) In this application, unless otherwise specified or there is a logical conflict, the terms and / or descriptions between different embodiments are consistent and can be referenced by each other. The technical features in different embodiments can be combined to form new embodiments according to their internal logical relationships.

[0146] (2) In this application, "at least one" means one or more, and "more" means two or more. "And / or" describes the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone, where A and B can be singular or plural. In the text description of this application, the character " / " generally indicates that the previous and next associated objects are in an "or" relationship. "At least one of the following" or similar expressions refers to any combination of these items, including any combination of single or plural items. For example, at least one of a, b and c can mean: a, or b, or c, or a and b, or a and c, or b and c, or a, b and c. Where a, b and c can be single or plural, respectively.

[0147] (3) In this application, the terms "first," "second," and various numerical designations are used for ease of description and are not intended to limit the scope of the embodiments of this application. For example, they are used to distinguish between different messages, rather than to describe a specific order or precedence. It should be understood that the terms described in this manner are interchangeable, where appropriate, to enable description of scenarios other than the embodiments of this application.

[0148] (4) In this application, the terms "comprises" and "comprising" and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, system, product or apparatus that includes a series of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to the process, method, product or apparatus.

[0149] (5) In this application, “used for indication” may include direct indication and indirect indication. When describing that a certain indication information is used to indicate A, it may include that the indication information directly indicates A or indirectly indicates A, but it does not mean that the indication information necessarily carries A.

[0150] (6) In this application, "protocol" may refer to a standard protocol in the field of communications, such as the 5G protocol, the new radio (NR) protocol, and related protocols used in future communication systems, and this application does not limit this. "Predefined" may include pre-definition, such as protocol definition. "Preconfiguration" may be implemented by pre-saving corresponding codes, tables, or other methods that can be used to indicate relevant information in the device, and this application does not limit its specific implementation method.

[0151] (7) In the present application, configuration may be signaling configuration, or may be described as configuration signaling. For example, signaling configuration includes configuration by signaling sent by a base station, which may be a radio resource control (RRC) message, downlink control information (DCI), or a system information block (SIB). Optionally, signaling configuration may also be configured to the terminal device by pre-configured signaling, or configured to the terminal device in a pre-configured manner. The pre-configuration here means defining or configuring the values ​​of corresponding parameters in advance in a protocol manner, and storing them in the terminal device when communicating with the terminal device. The pre-configured message can be modified or updated when the terminal device is connected to the network. Further optionally, the signaling configuration may limit the values ​​of the relevant parameters or configuration information to the resource pool sent or received by the terminal device. The resource pool is a collection of resources used for transmission on a specific carrier or bandwidth portion.

[0152] (8) In this application, "communication" may be described as "data transmission", "information transmission", "data processing", etc., "transmission" includes "sending" and "receiving", and "frequency band" may be described as "frequency band".

[0153] The communication method provided by the embodiment of the present application will be described in detail below with reference to the accompanying drawings. The embodiment 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 FIG1 above.

[0154] Figure 2 is a flowchart illustrating a sideline communication method 200 provided in an embodiment of the present application. As shown in Figure 2 , this method can be applied in either licensed or unlicensed spectrum. The method can be executed by a first terminal device, a second terminal device, or a network device, or by a chip or circuit used for the first terminal device, the second terminal device, or the network device, without limitation in this application. For ease of description, the method is described below using the first terminal device, the second terminal device, and the network device as an example. The method includes the following steps.

[0155] S210, the first terminal device obtains configuration information.

[0156] The configuration information indicates M frequency bands, at least one of which includes at least one carrier CC, and at least one carrier CC includes at least one bandwidth part (BWP), where M is an integer greater than or equal to 1. In other words, the configuration information may be configuration information for one or more bands, or in other words, may indicate a band or a band list. For example, when M is 1, the configuration information indicates a band #1, which includes one or more CCs, each of which includes one or more BWPs. For another example, when M is greater than 1, such as M = 2, the configuration information may indicate a band list, which includes multiple bands, such as band #2 and band #3. Optionally, band #2 includes one CC, and band #3 includes multiple CCs, each of which includes one or more BWPs.

[0157] Exemplarily, the configuration information may include one or more of the following: the frequency position of each band, the bandwidth size, the number and frequency position of CCs on each band, or the number and frequency position of BWPs on each CC, etc.

[0158] Optionally, the configuration information of the M frequency bands may be predefined by a standard; or, the configuration information of the M frequency bands may be configured by a network device or other UE; or, the configuration information of the M frequency bands may be preconfigured by the first terminal device at the factory; or, the configuration information of the M frequency bands may be indicated by signaling, for example, the network device sends the configuration information to the first terminal device. This application is not limited to this.

[0159] Below, the frequency band, carrier CC, bandwidth part BWP, default band, default CC, or default BWP involved in this application are exemplified.

[0160] (1) Frequency band, default band.

[0161] In this application, a frequency band refers to a set of frequencies used for wireless communications. When describing a frequency band, information such as the starting frequency, the ending frequency, and the bandwidth are usually used to describe it. Optionally, the frequency band can be divided into a low frequency band (such as below 6 GHz, or below 7.125 GHz, or below 10 GHz), or a high frequency band (a frequency band or frequency range with a higher frequency than the low frequency band). Optionally, based on the high and low frequencies, the frequency band can sometimes be divided into low frequency, medium frequency, and high frequency. Optionally, the frequency band can also include a TDD frequency band and an FDD frequency band. Optionally, the TDD frequency band is a frequency band that is continuous in the frequency domain. Optionally, the FDD frequency band is a pair of frequency bands, including an uplink frequency band and a downlink frequency band, respectively. And, optionally, the uplink frequency band and the downlink frequency band are each continuous in the frequency domain. Optionally, the frequency band number nx can be used to represent the frequency band coded as x. For example, n1 represents an FDD frequency band with an uplink frequency of 1920–1980 and a downlink frequency of 2110–2170. For another example, n8 represents an FDD frequency band with an uplink frequency of 880–915 and a downlink frequency of 925–960. For example, n46 represents a TDD frequency band with a frequency of 5150–5925 MHz. For another example, n47 represents a TDD frequency band with a frequency of 5855–5925. For another example, n102 represents a TDD frequency band with a frequency of 5925–6425. For another example, n104 represents a TDD frequency band with a frequency of 6425–7125. Optionally, frequency bands with different numbers can be continuous or discontinuous in the frequency domain.

[0162] Optionally, the band involved in the embodiments of the present application may be an unlicensed band, an ITS band, or an authorized band, and the present application does not impose any limitation on this.

[0163] It should be understood that at least one frequency band includes at least one carrier. For example, there are band #1 and band #2, and band #1 includes CC #1 and CC #2.

[0164] Exemplarily, at least one frequency band includes a second frequency band, and the second frequency band is used for communication between the first terminal device and the second terminal device when one or more of the following conditions are met: no indication information of the frequency band used for communication between the first terminal device and the second terminal device is received, no load information is obtained, the device is powered on, or the switching of the first terminal device fails. In an embodiment of the present application, the second frequency band here can be referred to as a default band. Optionally, there can be only one or more second frequency bands, and the present application does not limit this. Optionally, in a provided or configured band list, the second frequency band can be signaling configured or predefined.

[0165] (2) Carrier CC, default CC.

[0166] It should be understood that at least one carrier includes at least one bandwidth part. For example, there are CC#1 and CC#2. CC#1 includes BWP#1, and CC#2 includes BWP#2 and BWP#3.

[0167] Optionally, the at least one carrier includes a first carrier and a second carrier, and frequency domain resources occupied by the first carrier and the second carrier partially overlap, and the partially overlapping frequency domain resources include frequency domain resources used to transmit a first sidelink synchronization signal block (S-SSB). In this way, when the first terminal device switches on an adjacent carrier, synchronization adjustment can be avoided.

[0168] Exemplarily, at least one carrier includes a third carrier. When one or more of the following conditions are met, the third carrier is used for communication between the first terminal device and the second terminal device: no indication information of the frequency band used for communication between the first terminal device and the second terminal device is received, no load information is obtained, the device is powered on, or the first terminal device fails to switch. In this embodiment of the present application, the third carrier can be referred to as a default CC.

[0169] Optionally, the default CC may be on a default band or a non-default band, and this application does not impose any limitation on this.

[0170] (3) Bandwidth part BWP, default BWP.

[0171] It should be understood that at least one bandwidth part includes at least one resource block set (RB set). For example, there are BWP#1 and BWP#2, BWP#1 includes RB set#1 and RB set#2, and BWP#2 includes RB set#3.

[0172] Optionally, the at least one bandwidth portion includes a first bandwidth portion and a second bandwidth portion, and frequency domain resources occupied by the first bandwidth portion and the second bandwidth portion partially overlap, where the partially overlapping frequency domain resources include frequency domain resources used to transmit the second sidelink synchronization signal block (S-SSB). In this way, when the first terminal device switches between adjacent bandwidth portions, synchronization adjustment can be avoided.

[0173] Exemplarily, the at least one bandwidth portion includes a third bandwidth portion, and the third bandwidth portion is used for communication with the second terminal device when one or more of the following conditions are met: failure to receive an indication of a frequency band for communication between the first terminal device and the second terminal device, failure to obtain any load information, power-on status, or handover failure of the first terminal device. In embodiments of the present application, the third bandwidth portion may be referred to as a default BWP.

[0174] Optionally, the default BWP may be on a default CC or a non-default CC, which is not limited in this application.

[0175] In summary, the network device in the embodiment of the present application can configure a set of CC lists on each band, which are applied to all available unlicensed spectrum, and the frequency of S-SSB can be configured on each CC to support BWP-level SLU synchronization. Optionally, adjacent CCs or adjacent BWPs in a band can overlap in the frequency domain, and the overlapping part can be used to transmit S-SSB. Optionally, the M frequency bands include at least one default band, and the network device can configure a default BWP or default CC on each band or only on the default band to reduce the number of blind detections and power consumption of the receiver. Exemplarily, all terminal devices (for example, a first terminal device) can communicate with a second terminal device on the default band, or the default CC, or the default BWP. Correspondingly, after obtaining the configuration information, the first terminal device can obtain the frequency position and / or bandwidth size corresponding to the M bands (or CCs in the M bands, or BWPs in the CCs), including the frequency position and / or bandwidth size corresponding to the default band (or default CC, or default BWP), and information such as the frequency position of the S-SSB on each CC or BWP.

[0176] Figure 3 is a schematic diagram of configuring different carriers on the FR1 frequency band provided by an embodiment of the present application. As shown in Figure 3, it includes four bands: 5.17-5.33 GHz, 5.735-5.835 GHz, 5.925-6.425 GHz, and 6.425-7.125 GHz. The 5.17-5.33 GHz band includes CC1 and CC2, and the overlapping portion between CC1 and CC2 can be used for S-SSB transmission. The 5.735-5.835 GHz band includes CC3. The 5.925-6.425 GHz band includes CC4 and CC5, and the overlapping portion between CC4 and CC5 can be used for S-SSB transmission. The 6.425-7.125 GHz band includes CC6, CC7, CC8, and CC9, and the overlapping portions between CC5 and CC6, CC6 and CC7, CC7 and CC8, and CC8 and CC9 can all be used for S-SSB transmission.

[0177] S220, the first terminal device switches from the current working frequency band of the first terminal device to the first frequency band according to the load information of at least one frequency band among the M frequency bands, or switches from the current working carrier of the first terminal device to the first carrier in the first frequency band, and the first frequency band belongs to the M frequency bands.

[0178] The load information is used to indicate channel state information or channel usage information on at least one frequency band.

[0179] It should be understood that the load information of at least one frequency band can be understood as: load information of at least one frequency band, and / or, load information of at least one carrier in at least one frequency band, and / or, load information of the bandwidth part in at least one carrier in at least one frequency band.

[0180] In this embodiment of the present application, the load information may include one or more of the following:

[0181] (1) Channel busy ratio (CBR) and / or channel occupancy ratio (CR) for the unlicensed spectrum sidelink.

[0182] (2) CBR or CR on each resource block set RB set.

[0183] It should be understood that a BWP includes one or more RB sets, for example, each RB set has a size of 20 MHz.

[0184] (3) CBR or CR on the resource pool.

[0185] (4) Information on the quality of the signal received on the frequency band and / or carrier and / or bandwidth part and / or resource pool, the signal quality information including: reference signal strength indication (RSSI), reference signal receiving power (RSRP), reference signal receiving quality (RSRQ), channel quality indication (CQI), signal-to-noise ratio (SNR) and / or signal to interference plus noise ratio (SINR).

[0186] (5) the number of radio link failures (RLFs) on the frequency band, carrier, bandwidth portion, and / or resource pool within the first time interval T1;

[0187] (6) Statistical information of persistent LBT failures on frequency bands, and / or carriers, and / or bandwidth parts, and / or resource pools within the second time interval T2.

[0188] It should be understood that switching from the current working frequency band of the first terminal device to the first frequency band may refer to switching from band#1 to band#2; switching from the current working carrier of the first terminal device to the first carrier in the first frequency band may refer to switching from CC#1 in band#1 to CC#2 in band#1, or switching from CC#1 in band#1 to CC#2 in band#2, that is, the first terminal device may first switch from band#1 to band#2, and then switch to CC#2, and this application does not limit this.

[0189] Exemplarily, before executing step S220, the method further includes: the first terminal device obtains load information of at least one frequency band among the M frequency bands. The specific implementation method of the first terminal device obtaining load information of at least one frequency band among the M frequency bands is described below.

[0190] In the first implementation method, the first terminal device measures the load information of at least one of the M frequency bands based on the configuration information obtained in step S210. The specific measurement method can refer to the existing protocol, and this application does not limit this.

[0191] Exemplarily, assuming M=2, including band#1 and band#2, the first terminal device can measure the load information on band#1 and band#2 respectively, such as CBR or CR, information on the received signal quality, such as RSSI, RSRP, RSRQ, CQI, SNR, SINR, the number of RLFs in the time interval T1, or the number or duration of continuous LBT failures in the time interval T2, etc.

[0192] It should be understood that measuring the load information of at least one frequency band among the M frequency bands can be understood as: measuring the load information of at least one frequency band among the M frequency bands, and / or measuring the load information of at least one carrier in at least one frequency band among the M frequency bands, and / or measuring the load information of at least one bandwidth part in at least one carrier in at least one frequency band. This application is not limited to this.

[0193] In one example, the first terminal device can measure the load information of at least one of the M frequency bands based on the configuration information obtained in step S210; that is, the first terminal device can autonomously measure the load information on one or more of the M frequency bands based on the obtained configuration information of the M frequency bands to obtain a first measurement result.

[0194] In another example, the first terminal device may receive measurement configuration information from the network device, and measure load information on the band, CC, or BWP in a targeted manner according to the measurement configuration information.

[0195] Exemplarily, the first terminal device receives first measurement configuration information, and determines M1 frequency bands based on the first configuration information, and then measures the load information of M1 frequency bands among the M frequency bands to obtain a first measurement result. For example, the first terminal device determines to measure the number of RLFs on band#1 within time interval T1 based on the first measurement configuration information; or the first terminal device determines to measure the CBR or CR on the resource pool based on the first measurement configuration information.

[0196] Exemplarily, the first terminal device receives the second measurement configuration information, and determines, based on the second measurement configuration information, M2 carriers in M1 frequency bands among the M frequency bands, and then measures the load information of the M2 carriers in M1 frequency bands among the M frequency bands to obtain a first measurement result. For example, the first terminal device determines, based on the second measurement configuration information, to measure the CBR and / or CR for SLU on CC#1 in band#1; or, based on the second measurement configuration information, the first terminal device determines, based on the second measurement configuration information, to measure the number of continuous LBT failures on all CCs in band#1 and band#2 within a time interval T2.

[0197] Exemplarily, the first terminal device receives the third measurement configuration information, and determines the M3 bandwidth parts in the M2 carriers in the M1 frequency bands in the M frequency bands based on the third measurement configuration information, and then measures the load information of the M3 bandwidth parts in the M2 carriers in the M1 frequency bands in the M frequency bands to obtain a first measurement result. For example, the first terminal device determines to measure the CBR or CR on each resource block set RB set on BWP#2 in CC#1 in band#1 based on the third measurement configuration information; or, the first terminal device determines to measure the RSRP information of the received signal quality on BWP#1 in CC#2 in band#1, and to measure the RSSI and SNR information of the received signal quality on BWP#2 in CC#1 in band#2 based on the third measurement configuration information.

[0198] Optionally, the measurement configuration information may include one or more of the following: a target band, CC, BWP, or load information, for example, a frequency position or frequency position index for indicating the target band and / or CC and / or BWP, and load information of the target band and / or CC and / or BWP that the corresponding network device expects the first terminal device to measure. M1 is an integer greater than or equal to 1 and less than or equal to M, and M2 and M3 are integers greater than or equal to 1.

[0199] Optionally, the measurement configuration information may be indicated by the network device through RRC signaling, and correspondingly, the first terminal device may perform targeted load information measurement based on the measurement configuration information. Compared with the first implementation, the purpose of effectively saving energy for the first terminal device can be achieved.

[0200] Optionally, the measurement configuration information may be configured to the first terminal device together with the configuration information in step S210, or the two may be configured independently.

[0201] That is, after the first terminal device receives the measurement configuration information sent by the network device, it can measure the specified load information on the band, CC, and / or BWP in a targeted manner to avoid unnecessary measurement of load information.

[0202] In a second implementation, the first terminal device receives load information of at least one of the M frequency bands from a network device or other terminal devices (such as a second terminal device or a third terminal device), and then switches from the current working frequency band to the first frequency band, or switches from the current working carrier to the first carrier in the first frequency band, based on the load information of at least one of the M frequency bands.

[0203] Exemplarily, the network device may send load information of at least one of the M frequency bands to the first terminal device via RRC signaling or a broadcast message.

[0204] Optionally, the network device or other terminal device may further send identification information of terminal devices residing on at least one of the M frequency bands to the first terminal device. For example, the network device may indicate to the first terminal device load information on band#1 and terminal device UE3 residing on band#1, as well as load information on band#2 and terminal devices UE4 and UE5 residing on band#2.

[0205] Optionally, based on the first measurement result obtained based on the load information of at least one of the M frequency bands measured by the above-mentioned first terminal device, the first terminal device can send the first measurement result to the network device and / or other terminal devices, so that the network device and / or other terminal devices can obtain the load information of at least one of the M frequency bands in a timely manner, and adjust or switch the frequency band and / or carrier and / or bandwidth part used for communication in a targeted manner.

[0206] Optionally, the first terminal device may send load information of at least one of the M frequency bands measured to other terminal devices or network devices on a default band, a default CC, or a default BWP.

[0207] Furthermore, after sending the first measurement result, the first terminal device receives switching indication information from the network device and / or other terminal devices, where the switching indication information is used to indicate switching from the current operating frequency band of the first terminal device to the first frequency band, or switching from the current operating carrier of the first terminal device to the first carrier in the first frequency band. Optionally, the switching indication information is determined by the network device and / or other terminal devices based on load information of at least one frequency band among the M frequency bands, or the first measurement result.

[0208] Exemplarily, the switching indication information may include: the frequency position and / or bandwidth of the band, CC or BWP before the first terminal device switches, the frequency position and / or bandwidth of the band, CC or BWP after the switching, and other information.

[0209] Optionally, when the load information on the current working frequency band of the first terminal device is greater than a preset threshold, a switching request message is sent to the network device and / or other terminal devices, where the switching request message is used to request switching from the current working frequency band of the first terminal device to the first frequency band; or, to request switching from the current working carrier of the first terminal device to the first carrier in the first frequency band. Optionally, after receiving the switching request message, the network device and / or other terminal devices send a switching response message to the first terminal device to indicate whether the switching request of the first terminal device is approved. If approved, the first terminal device can subsequently switch from the current working frequency band of the first terminal device to the first frequency band, or switch from the current working carrier of the first terminal device to the first carrier in the first frequency band; otherwise, if not approved, communication may be interrupted.

[0210] For example, if the CBR on all RB sets on the default CC exceeds a preset threshold, or LBT failure continues, or the difference between the measured value of the currently working BWP and the best candidate BWP exceeds a preset threshold, the network device can send a switching indication message to the first terminal device through the Uu link, instructing all terminal devices performing SLU communication to perform band, CC, or BWP switching.

[0211] Optionally, when the first terminal device has sent a switching request message or the first terminal device has received a switching response message, the first terminal device can transmit data with the second terminal device on the first frequency band or the first carrier in the first frequency band.

[0212] The following two implementation methods are combined to illustrate the specific implementation method of the first terminal device switching from the current working frequency band of the first terminal device to the first frequency band, or switching from the current working carrier of the first terminal device to the first carrier in the first frequency band according to the load information of at least one frequency band in M ​​frequency bands.

[0213] In one implementation, the first terminal device autonomously determines and switches from the current working frequency band of the first terminal device to the first frequency band based on the acquired load information of at least one frequency band among the M frequency bands (for example, including load information determined by the first terminal device itself or load information received by the first terminal device from other terminal devices or network devices), or switches from the current working carrier of the first terminal device to the first carrier of the first frequency band based on the first measurement result.

[0214] Optionally, the first terminal device can determine the frequency band or carrier to be switched based on the load information of at least one of the M frequency bands measured by itself, and / or the load information of at least one of the M frequency bands received from a network device or other terminal device, and switch from the current working frequency band of the first terminal device to the first frequency band, or switch from the current working carrier to the first carrier of the first frequency band.

[0215] Exemplarily, assuming M=2, including band#1 and band#2, the first terminal device can measure the load information on band#1 and band#2 respectively, such as CBR or CR, the received signal quality information CQI, the number of RLFs in the time interval T1, etc., or the first terminal device can independently measure the load information on band#1, such as CBR or CR, the received signal quality information CQI, and receive the load information on band#2 from other terminal devices or network devices, such as CBR or CR, the number of RLFs in the time interval T1, and then determine the final switch to band#1 or band#2 based on the load information on band#1 and band#2.

[0216] In the second implementation method, the first terminal device determines the frequency band or carrier to be switched based on the switching indication information from other terminal devices or network devices, and then switches from the current working frequency band of the first terminal device to the first frequency band, or switches from the current working carrier to the first carrier of the first frequency band.

[0217] For example, assuming M=2, including band#1 and band#2, the first terminal device is currently communicating with the second terminal device on band#1. After receiving switching indication information from the network device or the second terminal device, if the switching indication information indicates the frequency position of band#2, the first terminal device can switch from band#1 to band#2. Further optionally, if the switching indication information indicates the frequency position of CC#2 in band#2, the first terminal device can switch from band#2 to CC#2 in band#2.

[0218] In one example, if the first terminal device is communicating with the second terminal device on the default band, default CC, or default BWP (for example, the second frequency band / third carrier / third bandwidth part), that is, the current working frequency band, working carrier, or working bandwidth part of the first terminal device is the default band, default CC, or default BWP, then the first terminal device switches from the default band, default CC, or default BWP to the first frequency band, the first carrier in the first frequency band, or the first bandwidth part in the first carrier in the first frequency band.

[0219] In another example, if the first terminal device communicates with the second terminal device on a non-default band, a non-default CC, or a non-default BWP, that is, the current working frequency band, working carrier, or working bandwidth portion of the first terminal device is a non-default band, a non-default CC, or a non-default BWP, then the first terminal device switches from the non-default band, the non-default CC, or the non-default BWP to the first frequency band, the first carrier in the first frequency band, or the first bandwidth portion in the first carrier in the first frequency band. The non-default band may be one or more bands other than the default band among the M bands, the non-default CC may be one or more CCs other than the default CC among multiple CCs, and the non-default BWP may be one or more BWPs other than the default BWP among multiple BWPs.

[0220] Further optionally, if the first terminal device communicates with the second terminal device on a non-default band, non-default CC, or non-default BWP, the first terminal device needs to indicate the identification, channel occupancy information, and load information of the terminal device on the frequency band and / or carrier and / or bandwidth part on which the first terminal device is currently actually working on the default band, default CC, or default BWP, so that the network device and / or other terminal devices can promptly know the relevant information on the frequency band and / or carrier and / or bandwidth part on which the first terminal device is currently actually working, and make targeted adjustments or switches to the frequency band and / or carrier and / or bandwidth part to ensure data transmission between devices.

[0221] Exemplarily, the first terminal device switches the band, CC, or BWP according to the load information and / or the switching indication information, which may include any of the following:

[0222] (1) Switching between different bands: For example, the first terminal device switches from band#1 to band#2.

[0223] (2) Handover between different CCs, which is applicable to carrier aggregation scenarios:

[0224] Switching between CCs in the same band, for example, the first terminal device switches from CC#1 in band#1 to CC#2 in band#1.

[0225] Switching between CCs in different bands, for example, the first terminal device switches from CC#1 in band#1 to CC#1 or CC#2 in band#2.

[0226] (3) Switching between different BWPs:

[0227] Switching between BWPs on the same CC in the same band, for example, the first terminal device switches from BWP#1 in CC#1 in band#1 to BWP#2 in CC#1 in band#1.

[0228] Switching between BWPs on different CCs in the same band, for example, the first terminal device switches from BWP#1 in CC#1 in band#1 to BWP#1 or BWP#2 in CC#2 in band#1.

[0229] Switching between BWPs on CCs in different bands, for example, the first terminal device switches from BWP#1 in CC#1 in band#1 to BWP#1 or BWP#2 in CC#1 or CC##2 in band#2.

[0230] Based on the above-mentioned measurement of the load information of at least one of the M frequency bands, and / or receiving the load information of at least one of the M frequency bands from the network device or other terminal devices, and / or receiving the switching indication information from the network device, the first terminal device can switch to the first frequency band, the first carrier in the first frequency band, or the first bandwidth part of the first carrier in the first frequency band, and then communicate with the second terminal device on the first frequency band, the first carrier in the first frequency band, or the first bandwidth part of the first carrier in the first frequency band to ensure data transmission between the devices.

[0231] S230: The first terminal device communicates with the second terminal device on the first frequency band or the first carrier in the first frequency band.

[0232] In one example, a first terminal device communicates with a second terminal device over a first bandwidth portion in a first frequency band.

[0233] In another example, a first terminal device communicates with a second terminal device on a second bandwidth portion in a first carrier in a first frequency band, wherein the first bandwidth portion or the second bandwidth portion is included in at least one bandwidth portion.

[0234] Figure 4 is a schematic diagram of a time window provided by an embodiment of the present application, including a transmission window (i.e., a first time unit), a listening window (i.e., a second time unit), a switching negotiation window, and a transmission window after switching. The frequency domain size of the candidate SL-CC and the default SL-CC on each time window is 100MHz. For example, the first terminal device can communicate with other terminal devices in the transmission window of the candidate SL-CC and the default SL-CC, and periodically detect the channel state information or channel usage information on other candidate SL-CCs or SL-BWPs in the listening window of the candidate SL-CC and the default SL-CC, that is, measure the load information. This method supports full-band load-balancing-based SL-CC or SL-BWP switching. Among them, the switching negotiation window is used for the first terminal device to send a switching request message and obtain a switching response message, which includes agreeing to or rejecting the switching request of the first terminal device. For example, if other terminal devices or network devices agree to the switching request of the first terminal device, the first terminal device can continue to communicate with other terminal devices in the transmission window after switching.

[0235] Optionally, during the measurement of load information on other candidate SL-CCs or SL-BWPs within the listening window, normal data transmission cannot be performed. That is, the transmission window is different from the listening window, and the size of the transmission window and / or the listening window can be predefined, or configured or preconfigured by signaling. This application does not limit this.

[0236] Based on the above scheme, the first terminal device obtains the configuration information of M frequency bands and the load information of at least one frequency band among the M frequency bands, and then determines to switch from the current working frequency band to the first frequency band, or from the current working carrier to the first carrier in the first frequency band, to avoid the current working frequency band or the current working carrier of the first terminal device affecting the transmission performance due to excessive load. That is to say, the first terminal device can adaptively switch to the first frequency band or the first carrier in the first frequency band according to the load information of at least one frequency band among the M frequency bands, to ensure normal communication with the second terminal device, improve the quality of communication, reduce transmission interruptions, and ensure system transmission performance.

[0237] Figure 5 is a schematic block diagram of a communication device 1000 provided in an embodiment of the present application. As shown in Figure 5, the device 1000 may include a transceiver unit 1010 and a processing unit 1020. The transceiver unit 1010 can communicate with the outside world, and the processing unit 1020 is used to process data. The transceiver unit 1010 may also be referred to as a communication interface or a transceiver unit. The processing unit 1020 can be used for processing.

[0238] Optionally, the device 1000 may further include a storage unit, which may be used to store instructions and / or data. The processing unit 1020 may read the instructions and / or data in the storage unit so that the device implements the aforementioned method embodiment.

[0239] Exemplarily, the communication device 1000 can be a first terminal device, or a communication device applied to the first terminal device or used in combination with the first terminal device and capable of implementing the method executed by the first terminal device, such as a chip, a chip system or a circuit. For details, please refer to the relevant description of the chip system shown in Figure 7.

[0240] Exemplarily, the communication device 1000 may be a network device, or a communication device applied to or used in conjunction with a network device and capable of implementing the method executed by the network device, such as a chip, a chip system, or a circuit. For details, see the description of the chip system shown in FIG7 . For example, the network device may be the LMF in the above-mentioned method embodiment.

[0241] In one possible design, the device 1000 can implement steps or processes corresponding to those performed by the first terminal device (for example, UE1) in the above method embodiment, wherein the processing unit 1020 is used to perform processing-related operations of the first terminal device in the above method embodiment, and the transceiver unit 1010 is used to perform transceiver-related operations of the first terminal device in the above method embodiment.

[0242] In another possible design, the device 1000 can implement steps or processes corresponding to those performed by the network device in the above method embodiment, wherein the transceiver unit 1010 is used to perform transceiver-related operations of the network device in the above method embodiment, and the processing unit 1020 is used to perform processing-related operations of the network device in the above method embodiment.

[0243] It should 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 merging 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 the transmitting end in the above-mentioned embodiment, and can be used to execute the various processes and / or steps corresponding to the transmitting end in the above-mentioned method embodiment, or the device 1000 can be specifically the receiving end in the above-mentioned embodiment, and can be used to execute the various processes and / or steps corresponding to the receiving end in the above-mentioned method embodiment. To avoid repetition, it will not be described here.

[0244] The device 1000 of each of the above-mentioned solutions has the function of implementing the corresponding steps performed by the sending end in the above-mentioned method, or the device 1000 of each of the above-mentioned solutions has the function of implementing the corresponding steps performed by the receiving end 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 transceiver operations and related processing operations in each method embodiment.

[0245] In addition, the above-mentioned transceiver unit can also be a transceiver circuit (for example, it can include a receiving circuit and a transmitting circuit), and the processing unit can be a processing circuit. In an embodiment of the present application, the device in Figure 5 can be the receiving end or the transmitting end in the aforementioned embodiment, or it can be a chip or a chip system, such as a system on chip (SoC). Among them, the transceiver unit can be an input and output circuit or a communication interface. The processing unit is a processor or microprocessor or integrated circuit integrated on the chip. This is not limited here.

[0246] Figure 6 is a schematic block diagram of a communication device 2000 provided in an embodiment of the present application. As shown in Figure 6, the device 2000 includes a processor 2010 and a transceiver 2020. The processor 2010 and the transceiver 2020 communicate with each other via an internal connection path. The processor 2010 is configured to execute instructions to control the transceiver 2020 to transmit and / or receive signals.

[0247] Optionally, the apparatus 2000 may further include a memory 2030, which communicates with the processor 2010 and the transceiver 2020 via an internal connection path. The memory 2030 is used to store instructions, and the processor 2010 may execute the instructions stored in the memory 2030.

[0248] Exemplarily, the communication device 2000 can be a first terminal device, or a communication device applied to the first terminal device or used in combination with the first terminal device and capable of implementing the method executed by the first terminal device, such as a chip, a chip system or a circuit. For details, please refer to the relevant description of the chip system shown in Figure 7.

[0249] Exemplarily, the communication device 2000 can be a network device, or a communication device applied to a network device or used in conjunction with a network device and capable of implementing a method for executing a location management function network element, such as a chip, a chip system or a circuit. For details, please refer to the relevant description of the chip system shown in Figure 7.

[0250] In one possible implementation, the apparatus 2000 is used to implement the various processes and steps corresponding to the first terminal device (eg, UE1) in the above method embodiment.

[0251] In another possible implementation, the apparatus 2000 is used to implement the various processes and steps corresponding to the network device in the above method embodiment.

[0252] It should be understood that device 2000 can be specifically the transmitting end or receiving end in the above-mentioned embodiments, or can also be a chip or chip system. Correspondingly, the transceiver 2020 can be the transceiver circuit of the chip, which is not limited here. Specifically, the device 2000 can be used to perform the various steps and / or processes corresponding to the transmitting end or receiving end in the above-mentioned method embodiments.

[0253] Optionally, the memory 2030 may include a read-only memory and a random access memory, and provide instructions and data to the processor. A portion of the memory may also include non-volatile random access memory. For example, the memory may also store device type information. The processor 2010 may be configured to execute instructions stored in the memory. When the processor 2010 executes the instructions stored in the memory, the processor 2010 is configured to perform the various steps and / or processes of the above-described method embodiments corresponding to the transmitting end or the receiving end.

[0254] During implementation, each step of the above method can be completed by an integrated logic circuit of the hardware in the processor or by instructions in the form of software. The steps of 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 storage medium mature 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, and the processor reads the information in the memory and completes the steps of the above method in conjunction with its hardware. To avoid repetition, it will not be described in detail here.

[0255] It should be noted that the processor in the embodiments of the present application can be an integrated circuit chip with signal processing capabilities. During implementation, each step of the above-described method embodiments can be completed by hardware integrated logic circuits in the processor or by software instructions. The above-described processor can be a general-purpose processor, a digital signal processor, an application-specific integrated circuit, a field-programmable gate array or other programmable logic device, a discrete gate or transistor logic device, a discrete hardware component, or the aforementioned CPU, other general-purpose processors, a DSP, an ASIC, an FPGA or other programmable logic device, or a portion of the circuitry in other chips used for processing functions. The processor in the embodiments of the present application can implement or execute the various methods, steps, and logic block diagrams disclosed in the embodiments of the present application. The general-purpose processor can be a microprocessor or any conventional processor. The steps of the methods disclosed in the embodiments of the present application can be directly implemented and executed by a hardware decoding processor, or by a combination of hardware and software modules in the decoding processor. The software modules can be located in a storage medium well-known in the art, such as random access memory, flash memory, read-only memory, programmable read-only memory, electrically erasable programmable memory, registers, etc. The storage medium is located in a memory, and the processor reads information from the memory and, in conjunction with its hardware, completes the steps of the above-described method.

[0256] It is understood that the memory in the embodiments of the present application may be a volatile memory or a non-volatile memory, or may include both volatile and non-volatile memories. Among them, the non-volatile memory may be a read-only memory (ROM), a programmable read-only memory (PROM), an erasable programmable read-only memory (EPROM), an electrically erasable programmable read-only memory (EEPROM), or a flash memory. The volatile memory may be a random access memory (RAM), which is used as an external cache. By way of example and not limitation, many forms of RAM are available, such as static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), double data rate SDRAM (DDR SDRAM), enhanced SDRAM (ESDRAM), synchronous link DRAM (SLDRAM), and direct RAM bus RAM (DR RAM). It should be noted that the memory of the systems and methods described herein is intended to include, but is not limited to, these and any other suitable types of memory.

[0257] In the embodiment of the present application, the method described in FIG2 above can be executed by the first terminal device, the second terminal device, and the network device, or can be executed by a chip, chip system, or circuit of the first terminal device, the second terminal device, and the network device. The chip, chip system, or circuit can be installed in the first terminal device, the second terminal device, and the network device. Below, the chip system in the first terminal device, the second terminal device, and the network device is described in conjunction with FIG7.

[0258] FIG7 is a schematic block diagram of a chip system 3000 provided in an embodiment of the present application. As shown in FIG7 , the chip system 3000 (or also referred to as a processing system) includes a logic circuit 3010 and an input / output interface 3020 .

[0259] Logic circuit 3010 may be a processing circuit in chip system 3000. Logic circuit 3010 may be coupled to a storage unit and call instructions in the storage unit, so that chip system 3000 can implement the methods and functions of various embodiments of the present application. Input / output interface 3020 may be an input / output circuit in chip system 3000, outputting information processed by chip system 3000 or inputting data or signaling information to be processed into chip system 3000 for processing.

[0260] As a solution, the chip system 3000 is used to implement the operations performed by the terminal device in the above various method embodiments.

[0261] For example, the logic circuit 3010 is used to implement the processing-related operations performed by the first terminal device in the above method embodiment, such as the processing-related operations performed by the first terminal device in the embodiment shown in Figure 2; the input / output interface 3020 is used to implement the sending and / or receiving-related operations performed by the first terminal device in the above method embodiment, such as the sending and / or receiving-related operations performed by the first terminal device in the embodiment shown in Figure 2.

[0262] For another example, the logic circuit 3010 is used to implement the processing-related operations performed by the network device in the above method embodiment, such as the processing-related operations performed by the network device in the embodiment shown in Figure 2; the input / output interface 3020 is used to implement the sending and / or receiving-related operations performed by the network device in the above method embodiment, such as the sending and / or receiving-related operations performed by the network device in the embodiment shown in Figure 2.

[0263] An embodiment of the present application further provides a computer-readable storage medium storing computer instructions for implementing the methods executed by a terminal device (such as a first terminal device, or a network device) in the above-mentioned method embodiments.

[0264] An embodiment of the present application also provides a computer program product, comprising instructions, which, when executed by a computer, implement the methods performed by a terminal device (such as a first terminal device, or a network device) in the above-mentioned method embodiments.

[0265] An embodiment of the present application also provides a communication system, which includes the first terminal device and the network device in the above embodiments.

[0266] 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.

[0267] 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.

[0268] Those skilled in the art will clearly understand that, for the convenience and brevity of description, the specific working processes of the systems, devices and units described above can refer to the corresponding processes in the aforementioned method embodiments and will not be repeated here.

[0269] In the several embodiments provided in this application, it should be understood that the disclosed systems, devices and methods can be implemented in other ways. For example, the device embodiments described above are merely schematic. For example, the division of the units is merely a logical function division. In actual implementation, there may be other division methods, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that 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.

[0270] The units described 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 to achieve the purpose of this embodiment according to actual needs.

[0271] In addition, each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.

[0272] If the functions are implemented in the form of software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present application, or the part that contributes to the prior art, or the part of the technical solution, can be embodied in the form of a software product. The computer software product is stored in a storage medium and includes several instructions for enabling a computer device (which can be a personal computer, server, or device, etc.) to execute all or part of the steps of the method described in each embodiment of the present application. The aforementioned storage medium includes various media that can store program codes, such as a USB flash drive, a mobile hard disk, a read-only memory, a random access memory, a magnetic disk, or an optical disk.

[0273] 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 side communication method, characterized in that: include: Acquire configuration information, where the configuration information is used to indicate M frequency bands, where at least one frequency band of the M frequency bands includes at least one carrier, and M is an integer greater than or equal to 1; Switching from a current working frequency band of a first terminal device to a first frequency band, or switching from a current working carrier of the first terminal device to a first carrier in the first frequency band, according to load information of at least one frequency band among the M frequency bands, wherein the load information is used to indicate channel state information or channel usage information on the at least one frequency band, and the first frequency band is included in the M frequency bands; Communicate with a second terminal device on the first frequency band or a first carrier in the first frequency band.

2. The method according to claim 1, characterized in that The at least one carrier includes at least one bandwidth portion, and the communicating with the second terminal device on the first frequency band or the first carrier in the first frequency band includes: communicating with the second terminal device on a first bandwidth portion in the first frequency band; or, communicating with the second terminal device over a second bandwidth portion in a first carrier in the first frequency band; The first bandwidth part or the second bandwidth part is included in the at least one bandwidth part.

3. The method according to claim 1 or 2, characterized in that: The at least one carrier includes a first carrier and a second carrier, the frequency domain resources occupied by the first carrier and the second carrier partially overlap, and the partially overlapping frequency domain resources include frequency domain resources used to transmit a first sideline synchronization signal block; or, At least one bandwidth part in the at least one carrier includes a first bandwidth part and a second bandwidth part, and the frequency domain resources occupied by the first bandwidth part and the second bandwidth part partially overlap, and the partially overlapping frequency domain resources include frequency domain resources for transmitting a second side synchronization signal block.

4. The method according to any one of claims 1 to 3, characterized in that The at least one frequency band includes a second frequency band, and the second frequency band is used for the first terminal device to communicate with the second terminal device when one or more of the following conditions are met: no indication information of the frequency band used for communication between the first terminal device and the second terminal device is received, no load information is obtained, the power-on state, or the switching of the first terminal device fails; and / or, At least one carrier in the at least one frequency band includes a third carrier, and the third carrier is used for the first terminal device to communicate with the second terminal device when one or more of the following conditions are met: no indication information of the frequency band used for communication between the first terminal device and the second terminal device is received, no load information is obtained, the power-on state, or the switching of the first terminal device fails; and / or, At least one bandwidth part in the at least one carrier includes a third bandwidth part. When one or more of the following conditions are met, the third bandwidth part is used for the first terminal device to communicate with the second terminal device: when no indication information of the frequency band used for communication between the first terminal device and the second terminal device is received, no load information is obtained, the power-on state, or the switching of the first terminal device fails.

5. The method according to any one of claims 1 to 4, characterized in that The switching from the current working frequency band of the first terminal device to the first frequency band, or switching from the current working carrier of the first terminal device to the first carrier in the first frequency band according to the load information of at least one frequency band among the M frequency bands, includes: Measuring load information of at least one frequency band among the M frequency bands to obtain a first measurement result; switching from a current operating frequency band of the first terminal device to the first frequency band according to the first measurement result, or, Switch from a current working carrier of the first terminal device to a first carrier of the first frequency band according to the first measurement result.

6. The method according to claim 5, characterized in that The measuring load information of at least one frequency band among the M frequency bands includes: According to the configuration information, load information of at least one frequency band among the M frequency bands is measured; or, at least one or more of the following is included: According to the first measurement configuration information, load information of M1 frequency bands among the M frequency bands is measured, where the M1 frequency bands are determined according to the first measurement configuration information; or, According to the second measurement configuration information, load information of M2 carriers in M1 frequency bands among the M frequency bands is measured, where the M1 frequency band and the M2 carriers are determined according to the second measurement configuration information; According to the third measurement configuration information, load information of the M3 bandwidth part in the M2 carrier in the M1 frequency band in the M frequency bands is measured, and the M1 frequency band, the M2 carrier and the M3 bandwidth part are determined according to the third measurement configuration information. determined; Among them, M1 is an integer greater than or equal to 1 and less than or equal to M, and M2 and M3 are integers greater than or equal to 1.

7. The method according to any one of claims 1 to 6, characterized in that Before switching from a current working frequency band of the first terminal device to the first frequency band, or switching from a current working carrier of the first terminal device to a first carrier in the first frequency band according to load information of at least one frequency band among the M frequency bands, the method further includes: Load information of at least one frequency band among the M frequency bands is received.

8. The method according to claim 6 or 7, characterized in that: The method further comprises: sending the first measurement result; After sending the first measurement result, receiving switching indication information, the switching indication information is used to indicate switching from a current working frequency band of the first terminal device to the first frequency band, or switching from a current working carrier of the first terminal device to a first carrier in the first frequency band; Wherein, according to the load information of at least one frequency band in the M frequency bands, switching from the current working frequency band of the first terminal device to the first frequency band, or switching from the current working carrier of the first terminal device to the first carrier in the first frequency band, includes: According to the switching indication information, switch from the current working frequency band of the first terminal device to the first frequency band, or switch from the current working carrier of the first terminal device to the first carrier in the first frequency band.

9. The method according to claim 8, characterized in that Before communicating with the second terminal device on the first frequency band or the first carrier in the first frequency band, the method further includes: Switching from the second frequency band to the first frequency band according to the switching indication information; and / or, Switching from the third carrier to the first carrier in the first frequency band according to the switching indication information; and / or, Switch from the third bandwidth part to the first bandwidth part in the first carrier according to the switching indication information.

10. The method according to any one of claims 5 to 9, characterized in that The time domain resources occupied by each carrier include a first time unit and a second time unit, and the measuring load information of at least one frequency band among the M frequency bands includes: In the second time unit, load information on at least one frequency band of the M frequency bands is measured, The first time unit is used for the first terminal device to communicate with the second terminal device, the first time unit is different from the second time unit, and the first time unit and / or the second time unit are signaling configured or predefined.

11. The method according to any one of claims 1 to 12, characterized in that The method further comprises: When the load information on the current working frequency band of the first terminal device is greater than a first threshold, sending a first switching request message, where the first switching request message is used to request switching from the current working frequency band of the first terminal device to the first frequency band; or, When the load information on the current working carrier of the first terminal device is greater than a second threshold, a second switching request message is sent, where the second switching request message is used to request switching from the current working carrier of the first terminal device to the first carrier in the first frequency band.

12. The method according to claim 11, characterized in that The communicating with the second terminal device on the first frequency band or the first carrier in the first frequency band includes: When the first switching request message or the second switching request message has been sent, or a switching response message has been received, data transmission is performed with the second terminal device on the first frequency band or the first carrier in the first frequency band, and the switching response message is used to indicate that the switching request of the first terminal device is approved.

13. The method according to any one of claims 4 to 12, characterized in that The method further comprises: When the current working frequency band of the first terminal device is not the second frequency band, first indication information is sent on the second frequency band, or the third carrier, or the third bandwidth part, wherein the first indication information is used to indicate one or more of the following: the frequency and / or bandwidth of the current working frequency band of the first terminal device, the identifier of the first terminal device, the identifier of the second terminal device, or the load information of the current working frequency band of the first terminal device; and / or, When the current working carrier of the first terminal device is not the third carrier, second indication information is sent on the second frequency band, or the third carrier, or the third bandwidth part, wherein the second indication information is used to indicate one or more of the following: the frequency and / or bandwidth of the current working carrier of the first terminal device, the identifier of the first terminal device, the identifier of the second terminal device, or the load information of the current working frequency band of the first terminal device; and / or, When the current working carrier of the first terminal device is not the third bandwidth part, third indication information is sent on the second frequency band, or the third carrier, or the third bandwidth part, and the third indication information is used to indicate one or more of the following: the frequency and / or bandwidth of the current working bandwidth part of the first terminal device, the identification of the first terminal device, the identification of the second terminal device, or the load information of the current working frequency band part of the first terminal device.

14. The method according to any one of claims 1 to 13, characterized in that The load information includes one or more of the following: Channel busy ratio CBR and / or channel occupancy ratio CR for unlicensed spectrum sidelink; CBR and / or channel occupancy ratio CR on a set of resource blocks; CBR and / or channel occupancy ratio CR on the resource pool; Information about the quality of a signal received on a frequency band and / or a carrier and / or a bandwidth part and / or a resource pool, the information about the signal quality comprising: a reference strength indicator RSSI, a reference signal received power RSRP, a reference signal received quality RSRQ, a channel quality indicator CQI, a signal-to-noise ratio SNR and / or a signal-to-interference-plus-noise ratio SINR; The number of radio link failures (RLFs) on the frequency band and / or carrier and / or bandwidth part and / or resource pool in the first time interval; or Statistics of persistent listen-before-talk (LBT) failures on the frequency band and / or carrier and / or bandwidth part and / or resource pool during the second time interval.

15. The method according to any one of claims 1 to 14, characterized in that The configuration information is predefined; or, The configuration information is configuration or pre-configuration; or, The configuration information is indicated by the network device through signaling.

16. A side communication method, characterized in that: include: receiving a first measurement result, where the first measurement result is determined by measuring load information of at least one frequency band among M frequency bands, where at least one frequency band among the M frequency bands includes at least one carrier, and M is an integer greater than or equal to 1; Send a second measurement result or switching indication information, where the second measurement result and the switching indication information are determined based on the first measurement result, and the switching indication information is used to indicate switching from a current working frequency band of the first terminal device to a first frequency band, or from a current working carrier of the first terminal device to a first carrier in the first frequency band.

17. The method according to claim 16, characterized in that The at least one carrier includes a first carrier and a second carrier, the frequency domain resources occupied by the first carrier and the second carrier partially overlap, and the partially overlapping frequency domain resources include frequency domain resources used to transmit a first sideline synchronization signal block; or, At least one bandwidth part in the at least one carrier includes a first bandwidth part and a second bandwidth part, and the frequency domain resources occupied by the first bandwidth part and the second bandwidth part partially overlap, and the partially overlapping frequency domain resources include frequency domain resources for transmitting a second side synchronization signal block.

18. The method according to claim 16 or 17, characterized in that The at least one frequency band includes a second frequency band, and the second frequency band is used for the first terminal device to communicate with the second terminal device when one or more of the following conditions are met: no indication information of the frequency band used for communication between the first terminal device and the second terminal device is received, no load information is obtained, the power-on state, or the switching of the first terminal device fails; and / or, At least one carrier in the at least one frequency band includes a third carrier, and the third carrier is used for the first terminal device to communicate with the second terminal device when one or more of the following conditions are met: no indication information of the frequency band used for communication between the first terminal device and the second terminal device is received, no load information is obtained, the power-on state, or the switching of the first terminal device fails; and / or, At least one bandwidth part in the at least one carrier includes a third bandwidth part. When one or more of the following conditions are met, the third bandwidth part is used for the first terminal device to communicate with the second terminal device: when no indication information of the frequency band used for communication between the first terminal device and the second terminal device is received, no load information is obtained, the power-on state, or the switching of the first terminal device fails.

19. The method according to any one of claims 16 to 18, characterized in that The method further comprises: sending first measurement configuration information, where the first measurement configuration information is used to instruct to measure load information of M1 frequency bands among the M frequency bands; or, Sending second measurement configuration information, where the second measurement configuration information is used to instruct to measure load information of M2 carriers in M1 frequency bands among the M frequency bands; Sending third measurement configuration information, where the third measurement configuration information is used to instruct to measure load information of M3 bandwidth parts in M2 carriers in M1 frequency bands in the M frequency bands; Among them, M1 is an integer greater than or equal to 1 and less than or equal to M, and M2 and M3 are integers greater than or equal to 1.

20. The method according to any one of claims 16 to 19, characterized in that Before receiving the first measurement result, the method further includes: The load information of at least one frequency band among the M frequency bands is transmitted.

21. The method according to any one of claims 18 to 20, characterized in that The method further comprises: When the current working frequency band of the first terminal device is not the second frequency band, first indication information is received on the second frequency band, or the third carrier, or the third bandwidth part, wherein the first indication information is used to indicate one or more of the following: the frequency and / or bandwidth of the current working frequency band of the first terminal device, the identifier of the first terminal device, the identifier of the second terminal device, or the load information of the current working frequency band of the first terminal device; and / or, When the current working carrier of the first terminal device is not the third carrier, second indication information is received on the second frequency band, or the third carrier, or the third bandwidth part, wherein the second indication information is used to indicate one or more of the following: the frequency and / or bandwidth of the current working carrier of the first terminal device, the identifier of the first terminal device, the identifier of the second terminal device, or the load information of the current working frequency band of the first terminal device; and / or, When the current working carrier of the first terminal device is not the third bandwidth part, third indication information is received on the second frequency band, or the third carrier, or the third bandwidth part, and the third indication information is used to indicate one or more of the following: the frequency and / or bandwidth of the current working bandwidth part of the first terminal device, the identification of the first terminal device, the identification of the second terminal device, or the load information of the current working frequency band part of the first terminal device.

22. The method according to any one of claims 16 to 21, characterized in that The load information includes one or more of the following: Channel busy ratio CBR and / or channel occupancy ratio CR for unlicensed spectrum sidelink; CBR and / or channel occupancy ratio CR on a set of resource blocks; CBR and / or channel occupancy ratio CR on the resource pool; Information about the quality of a signal received on a frequency band and / or a carrier and / or a bandwidth part and / or a resource pool, the information about the signal quality comprising: a reference strength indicator RSSI, a reference signal received power RSRP, a reference signal received quality RSRQ, a channel quality indicator CQI, a signal-to-noise ratio SNR and / or a signal-to-interference-plus-noise ratio SINR; The number of radio link failures (RLFs) on the frequency band and / or carrier and / or bandwidth part and / or resource pool in the first time interval; or Statistics of persistent listen-before-talk (LBT) failures on the frequency band and / or carrier and / or bandwidth part and / or resource pool during the second time interval.

23. A communication device, characterized in that: The method comprises a module or a unit for executing the method according to any one of claims 1 to 15, or a module or a unit for executing the method according to any one of claims 16 to 22.

24. A communication device, characterized in that: The communication device includes a processor, the processor is coupled to a memory, the memory stores instructions, and when the instructions are executed by the processor, the communication device executes the method according to any one of claims 1 to 15, or the communication device executes the method according to any one of claims 16 to 22.

25. A computer-readable storage medium, characterized in that: The computer-readable storage medium is used to store a computer program, and when the computer program is run on a computer, the computer is caused to execute the method according to any one of claims 1 to 15, or the computer is caused to execute the method according to any one of claims 16 to 22.

26. A chip, characterized in that: include: A processor, configured to call and run a computer program from a memory so that a communication device equipped with the chip executes a method as described in any one of claims 1 to 15, or a communication device equipped with the chip executes a method as described in any one of claims 16 to 22.

27. A communication system, characterized in that: Comprising a communication device as claimed in claim 23 or 24.

28. A computer program product, characterized in that When the computer program product is executed by a communication device, the method according to any one of claims 1 to 15 is implemented, or the method according to any one of claims 16 to 22 is implemented.

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