Communication method and device

Abstract

A communication method and apparatus, comprising: a first terminal device sending first information to a second terminal device on a first frequency band, the first information being used to instruct the second terminal device to switch from the first frequency band to a second frequency band. The first terminal device then sends data to the second terminal device on the second frequency band. Using this method, the second terminal device can switch from a smaller bandwidth to a larger bandwidth based on the first information, thereby meeting high throughput requirements and resolving the high power consumption and complexity issues associated with the second terminal device always operating at a large bandwidth.

Description

Technical Field

[0001] The present application relates to the field of communication technology, and in particular to a communication method and device. Background Art

[0002] In the 3rd Generation Partnership Project (3GPP) Release 14 (R14) protocol, a vehicle-to-everything (V2X) perception mechanism was introduced. This mechanism is mainly targeted at personal terminals or some power-constrained devices, with the aim of reducing device perception time and lowering device power consumption.

[0003] Currently, New Radio (NR) V2X has been allocated 70MHz (5855-5925MHz, n47 band), and some operators are considering allocating an additional 50MHz (2570-2620MHz, n38 band) for V2X. In total, NR V2X may utilize 70-120MHz of bandwidth. Increasing the NR V2X bandwidth from 20MHz in Long-Term Evolution (LTE) V2X to 70-120MHz will result in an increase in power consumption associated with the sensing mechanism. Specifically, in LTE V2X scenarios, terminal devices may detect the signal strength of periodic or aperiodic services within a 20MHz range. In NR V2X scenarios, terminal devices may detect the signal strength of periodic or aperiodic services within a 70-120MHz range, resulting in a significant increase in terminal device power consumption. According to preliminary discussions among some companies, reducing the bandwidth from 100MHz to 20MHz saves approximately 30% of power, while increasing the bandwidth from 20MHz to 100MHz increases power consumption by approximately 50%. Therefore, how to deal with the increase in power consumption of the perception mechanism caused by the increase in bandwidth is an urgent problem that needs to be solved. Summary of the Invention

[0004] The embodiments of the present application provide a communication method and apparatus for solving the problem of increased power consumption corresponding to a perception mechanism caused by increased bandwidth.

[0005] The first method, an embodiment of the present application provides a communication method, which includes: a first terminal device sends first information to a second terminal device on a first frequency band, wherein the first information is used to instruct the second terminal device to switch from the first frequency band to the second frequency band; the first terminal device sends data to the second terminal device on the second frequency band.

[0006] Using the above method, the first terminal device sends the first information to the second terminal device, and the second terminal device can switch from a smaller bandwidth to a larger bandwidth to work, thereby meeting the demand for high throughput, and at the same time solving the problems of high power consumption and high complexity caused by the second terminal device always perceiving at a large bandwidth.

[0007] In one possible design, the first information includes the amount of data required to be transmitted by the first terminal device and a first preset value.

[0008] With the above design, the second terminal device can independently determine whether the perception range needs to be changed based on the first information.

[0009] In one possible design, the first information includes the identifier of the second frequency band, the frequency band adjustment amplitude, the starting frequency domain position of the second frequency band, the ending frequency domain position of the second frequency band, the starting subchannel identifier of the second frequency band, the ending subchannel identifier of the second frequency band, and at least one of the number of PRBs or the number of subchannels corresponding to the second frequency band.

[0010] With the above design, the first information can indicate the second frequency band in multiple ways.

[0011] In one possible design, the first information indicates time domain information of the first resource and frequency domain information of the first resource, the first resource is used by the first terminal device to send the data to the second terminal device, the frequency domain information indicates the second frequency band, and the time domain information is determined based on the frequency band switching delay of the second terminal device.

[0012] With the above design, the first terminal device can determine the time domain information based on the frequency band switching delay of the second terminal device.

[0013] In one possible design, the first frequency band is a preconfigured frequency band, or the first frequency band is configured by the network device for the second terminal device.

[0014] In a possible design, it also includes: the first terminal device receives second information from the second terminal device, and the second information indicates the first frequency band.

[0015] With the above design, the first terminal device can obtain the first frequency band in a variety of ways.

[0016] In one possible design, the first frequency band is a preset resource pool, and the preset resource pool includes some sub-channels among multiple sub-channels; or, the first frequency band includes one or more sub-channels.

[0017] In a possible design, it also includes: the first terminal device receives third information from the second terminal device, and the third information indicates the frequency band switching delay of the second terminal device.

[0018] With the above design, the first terminal device can inform the second terminal device of the frequency band switching delay of the second terminal device.

[0019] In one possible design, the first terminal device sends the data to the second terminal device on the second frequency band after the frequency band switching delay; or, the first terminal device sends the data to the second terminal device on the second frequency band after the frequency band switching delay and the remaining time, and the remaining time is the remaining usage time corresponding to the first frequency band.

[0020] With the above design, the first terminal device can determine the timing of sending data.

[0021] In one possible design, the first terminal device determines that the amount of data required to be transmitted by the first terminal device is greater than a first preset value, then the first terminal device sends the first information to the second terminal device on the first frequency band.

[0022] With the above design, the first terminal device can determine whether it needs to send the first information based on the amount of data that the first terminal device needs to transmit.

[0023] In one possible design, the bandwidth of the first frequency band is smaller than the bandwidth of the second frequency band.

[0024] In a second aspect, an embodiment of the present application provides a communication method, which includes: a second terminal device receives first information from a first terminal device on a first frequency band, wherein the first information is used to instruct the second terminal device to switch from the first frequency band to a second frequency band; and the second terminal device receives data from the first terminal device on the second frequency band.

[0025] Using the above method, the first terminal device sends the first information to the second terminal device, and the second terminal device can switch to a large bandwidth to work, thereby meeting the demand for high throughput, and at the same time solving the problems of high power consumption and high complexity caused by the second terminal device always perceiving at a large bandwidth.

[0026] In one possible design, the first information also includes the amount of data required to be transmitted by the first terminal device and a first preset value; if the second terminal device determines that the amount of data required to be transmitted by the first terminal device is greater than the first preset value, it switches from the first frequency band to the second frequency band.

[0027] With the above design, the second terminal device can independently determine whether the perception range needs to be changed based on the first information.

[0028] In one possible design, the first information indicates time domain information of the first resource and frequency domain information of the first resource, the first resource is used by the first terminal device to send the data to the second terminal device, the frequency domain information indicates the second frequency band, and the time domain information is determined based on the frequency band switching delay of the second terminal device.

[0029] With the above design, the first terminal device can determine the time domain information based on the frequency band switching delay of the second terminal device.

[0030] In a possible design, it also includes: the second terminal device sends second information to the first terminal device, and the second information indicates the first frequency band.

[0031] In a possible design, it also includes: the second terminal device sends third information to the first terminal device, and the third information also indicates the frequency band switching delay of the second terminal device.

[0032] With the above design, the first terminal device can inform the second terminal device of the frequency band switching delay of the second terminal device.

[0033] In a possible design, it also includes: after the second terminal device receives the data from the first terminal device on the second frequency band, the second terminal device switches from the second frequency band to the first frequency band.

[0034] The above design can further save the power consumption of the terminal equipment.

[0035] In one possible design, the bandwidth of the first frequency band is smaller than the bandwidth of the second frequency band.

[0036] In one possible design, the first information includes the identifier of the second frequency band, the frequency band adjustment amplitude, the starting frequency domain position of the second frequency band, the ending frequency domain position of the second frequency band, the starting subchannel identifier of the second frequency band, the ending subchannel identifier of the second frequency band, and at least one of the number of PRBs or the number of subchannels corresponding to the second frequency band.

[0037] In one possible design, the first frequency band is a preconfigured frequency band, or the first frequency band is configured by the network device for the second terminal device.

[0038] In one possible design, the first frequency band is a preset resource pool, and the preset resource pool includes some sub-channels among multiple sub-channels; or, the first frequency band includes one or more sub-channels.

[0039] In a third aspect, an embodiment of the present application provides a communication method, comprising: a first terminal device sending first information to a second terminal device, the first information being used to obtain a frequency band of the second terminal device, the frequency band of the second terminal device being switched between multiple preset frequency bands; the first terminal device receiving second information from the second terminal device, the second information indicating a first frequency band, the first frequency band being one of the multiple preset frequency bands; and the first terminal device sending data to the second terminal device on the first frequency band.

[0040] Using this method, the second terminal device can switch between multiple preset frequency bands, thereby achieving full-bandwidth perception, thereby resolving the high power consumption and complexity associated with wide-bandwidth perception. Due to the increased number of available transmission resources, diversity gain can also be achieved.

[0041] In one possible design, the second information includes the identifier of the first frequency band, the starting frequency domain position of the first frequency band, the ending frequency domain position of the first frequency band, the starting subchannel identifier of the first frequency band, the ending subchannel identifier of the first frequency band, at least one of the number of PRBs or the number of subchannels corresponding to the first frequency band; and at least one of the remaining time corresponding to the first frequency band and the frequency band switching delay of the second terminal device.

[0042] Using the above method, the second information can indicate the first frequency band in multiple ways.

[0043] In one possible design, the first terminal device sends data to the second terminal device on the first frequency band within a remaining duration corresponding to the first frequency band. The method further includes: the second terminal device sending data to the second terminal device on a third frequency band after the remaining duration corresponding to the first frequency band, the third frequency band being a next frequency band adjacent to the first frequency band in a switching order corresponding to the multiple preset frequency bands.

[0044] By adopting the above method, the first terminal device can send data according to the remaining time corresponding to the first frequency band, and send data on the third frequency band after the remaining time.

[0045] In one possible design, the frequency band of the second terminal device is periodically switched between the multiple preset frequency bands.

[0046] In one possible design, the second information also includes switching periods corresponding to the multiple preset frequency bands.

[0047] In one possible design, the overlapping area between the multiple preset frequency bands includes a second frequency band; the first terminal device sends the first information to the second terminal device, including: the first terminal device sends the first information to the second terminal device on the second frequency band.

[0048] It should be understood that when the first terminal device sends the first information to the second terminal device for the first time, the first terminal device sends the first information to the second terminal device on the second frequency band. After the first terminal device receives the second information from the second terminal device, the first terminal device learns that the current perception range of the second terminal device is the first frequency band. At this time, the first terminal device can select all or part of the resources in the first frequency band to send data or messages to the second terminal device, wherein the part of the resources in the first frequency band may include or exclude the second frequency band, which is not limited in this embodiment of the present application.

[0049] In one possible design, the multiple preset frequency bands are two frequency bands, and the overlapping area of ​​the two frequency bands is the second frequency band.

[0050] In one possible design, the first information carries request information for inquiring about the frequency band of the second terminal device, and the second information includes information carrying the first frequency band.

[0051] In one possible design, the first terminal device sends the first information to the second terminal device respectively on the multiple preset frequency bands. The first terminal device receives the second information from the second terminal device on the first frequency band.

[0052] In one possible design, the multiple preset frequency bands include three or more preset frequency bands, and the three or more preset frequency bands do not overlap.

[0053] In one possible design, each of the multiple preset frequency bands is a resource within the frequency band.

[0054] In one possible design, the first frequency band is a preconfigured frequency band, or the first frequency band is configured by the network device for the second terminal device.

[0055] In one possible design, the first frequency band is a preset resource pool, and the preset resource pool includes some sub-channels among multiple sub-channels; or, the first frequency band includes one or more sub-channels.

[0056] In one possible design, the first terminal device determines that the amount of data required to be transmitted by the first terminal device is greater than a first preset value, and then the first terminal device sends the first information to the second terminal device.

[0057] In one possible design, the power consumption saving requirement of the first terminal device is higher than the power consumption saving requirement of the second terminal device.

[0058] In a fourth aspect, an embodiment of the present application provides a communication method, which includes: a second terminal device receives first information from a first terminal device, the first information is used to obtain a frequency band of the second terminal device; the frequency band of the second terminal device switches between multiple preset frequency bands; the second terminal device sends second information to the first terminal device, the second information indicates a first frequency band, and the first frequency band is one of the multiple preset frequency bands; the second terminal device receives data from the first terminal device on the first frequency band.

[0059] Using this method, the second terminal device can switch between multiple preset frequency bands, thereby achieving full-bandwidth perception, thereby resolving the high power consumption and complexity associated with wide-bandwidth perception. Due to the increased number of available transmission resources, diversity gain can also be achieved.

[0060] In one possible design, the second information includes the identifier of the first frequency band, the starting frequency domain position of the first frequency band, the ending frequency domain position of the first frequency band, the starting subchannel identifier of the first frequency band, the ending subchannel identifier of the first frequency band, at least one of the number of PRBs or the number of subchannels corresponding to the first frequency band; and at least one of the remaining time corresponding to the first frequency band and the frequency band switching delay of the second terminal device.

[0061] In one possible design, the second terminal device receives data from the first terminal device on the first frequency band within a remaining duration corresponding to the first frequency band.

[0062] In a possible design, it also includes: the second terminal device receives data from the first terminal device on a third frequency band after the remaining time corresponding to the first frequency band, and the third frequency band is the next frequency band adjacent to the first frequency band in the switching order corresponding to the multiple preset frequency bands.

[0063] In one possible design, the frequency band of the second terminal device is periodically switched between the multiple preset frequency bands.

[0064] In one possible design, the second information also includes switching periods corresponding to the multiple preset frequency bands.

[0065] In one possible design, the overlapping region between the plurality of preset frequency bands includes a second frequency band. The second terminal device receives the first information from the first terminal device on the second frequency band.

[0066] In one possible design, the multiple preset frequency bands are two frequency bands, and the overlapping area of ​​the two frequency bands is the second frequency band.

[0067] In one possible design, the first information carries request information for inquiring about the frequency band of the second terminal device, and the second information includes information for indicating the first frequency band.

[0068] In one possible design, the second terminal device receives the first information from the first terminal device on the first frequency band.

[0069] In one possible design, the multiple preset frequency bands include three or more preset frequency bands, and the three or more preset frequency bands do not overlap.

[0070] In one possible design, the first frequency band is a preconfigured frequency band, or the first frequency band is configured by the network device for the second terminal device.

[0071] In one possible design, the first frequency band is a preset resource pool, which includes some sub-channels among multiple sub-channels; or, the first frequency band includes one or more sub-channels among sub-channels that are larger than a preset bandwidth.

[0072] In one possible design, the power consumption saving requirement of the first terminal device is higher than the power consumption saving requirement of the second terminal device.

[0073] In a fifth aspect, an embodiment of the present application provides a communication method, which includes: a first terminal device determines a first frequency band based on a first parameter; the first parameter is associated with multiple preset frequency bands, the second terminal device periodically switches between the multiple preset frequency bands, and the first frequency band is one of the multiple preset frequency bands; the first terminal device sends data to the second terminal device on the first frequency band.

[0074] Using this method, the second terminal device can switch between multiple preset frequency bands, and the first terminal device can determine the second terminal device's current frequency band based on publicly known parameters. This can solve the problems of high power consumption and high complexity associated with wide-bandwidth sensing. Due to the increased number of optional transmission resources, the technical effect of diversity gain can also be achieved.

[0075] In one possible design, the first parameter is the DFN carried in the PSBCH sent by the synchronization source.

[0076] In one possible design, the first terminal device determines a label s of the first frequency band based on the first parameter, where: k is a preset positive integer, and N is the number of the plurality of preset frequency bands.

[0077] By adopting the above method, both the first terminal device and the second terminal device can easily determine the current frequency band.

[0078] In a sixth aspect, an embodiment of the present application provides a communication device, which includes: a processing unit and a transceiver unit, wherein the processing unit calls the transceiver unit to execute: sending first information to a second terminal device on a first frequency band, wherein the first information is used to instruct the second terminal device to switch from the first frequency band to the second frequency band; and sending data to the second terminal device on the second frequency band.

[0079] In one possible design, the first information includes the amount of data required to be transmitted by the first terminal device and a first preset value.

[0080] In one possible design, the first information indicates time domain information of the first resource and frequency domain information of the first resource, the first resource is used by the first terminal device to send the data to the second terminal device, the frequency domain information indicates the second frequency band, and the time domain information is determined based on the frequency band switching delay of the second terminal device.

[0081] In one possible design, the processing unit calls the transceiver unit to execute: receiving second information from the second terminal device, the second information indicating the first frequency band; or the first frequency band is a preconfigured frequency band; or the first frequency band is configured by the network device for the second terminal device.

[0082] In one possible design, the processing unit calls the transceiver unit to execute: receiving third information from the second terminal device, where the third information indicates a frequency band switching delay of the second terminal device.

[0083] In one possible design, when sending data to the second terminal device on the second frequency band, the processing unit calls the transceiver unit to execute: sending the data to the second terminal device on the second frequency band after the frequency band switching delay; or sending the data to the second terminal device on the second frequency band after the frequency band switching delay and the remaining time, and the remaining time is the remaining usage time corresponding to the first frequency band.

[0084] In one possible design, the processing unit is used to: when sending first information to a second terminal device on a first frequency band, if it is determined that the amount of data required to be transmitted by the first terminal device is greater than a first preset value, then the first terminal device sends the first information to the second terminal device on the first frequency band.

[0085] In one possible design, the first information includes the identifier of the second frequency band, the frequency band adjustment amplitude, the starting frequency domain position of the second frequency band, the ending frequency domain position of the second frequency band, the starting subchannel identifier of the second frequency band, the ending subchannel identifier of the second frequency band, and at least one of the number of physical resource blocks PRBs or the number of subchannels corresponding to the second frequency band.

[0086] In one possible design, the first frequency band is a preset resource pool, and the preset resource pool includes some sub-channels among multiple sub-channels; or, the first frequency band includes one or more sub-channels; the bandwidth of the first frequency band is smaller than the bandwidth of the second frequency band.

[0087] In the seventh aspect, an embodiment of the present application provides a communication device, which includes: a processing unit and a transceiver unit; the processing unit calls the transceiver unit to execute: receiving first information from a first terminal device on a first frequency band, the first information being used to instruct the second terminal device to switch from the first frequency band to a second frequency band; receiving data from the first terminal device on the second frequency band.

[0088] In one possible design, the first information also includes the amount of data required to be transmitted by the first terminal device and a first preset value; the processing unit is used to: if it is determined that the amount of data required to be transmitted by the first terminal device is greater than the first preset value, then switch from the first frequency band to the second frequency band.

[0089] In one possible design, the processing unit is configured to: after the second terminal device receives the data from the first terminal device on the second frequency band, switch from the second frequency band to the first frequency band.

[0090] In an eighth aspect, an embodiment of the present application provides a communication device, comprising: a processing unit and a transceiver unit; the processing unit calls the transceiver unit to execute: sending first information to a second terminal device, the first information being used to obtain a frequency band of the second terminal device, the frequency band of the second terminal device being switched between a plurality of preset frequency bands; receiving second information from the second terminal device, the second information indicating a first frequency band, the first frequency band being one of the plurality of preset frequency bands; and sending data to the second terminal device on the first frequency band.

[0091] In one possible design, the second information includes the identifier of the first frequency band, the starting frequency domain position of the first frequency band, the ending frequency domain position of the first frequency band, the starting subchannel identifier of the first frequency band, the ending subchannel identifier of the first frequency band, at least one of the number of PRBs or the number of subchannels corresponding to the first frequency band; and at least one of the remaining time corresponding to the first frequency band and the frequency band switching delay of the second terminal device.

[0092] In one possible design, when sending data to the second terminal device on the first frequency band, the processing unit calls the transceiver unit to execute: sending data to the second terminal device on the first frequency band within the remaining time corresponding to the first frequency band; or sending data to the second terminal device on a third frequency band after the remaining time corresponding to the first frequency band, the third frequency band being the next frequency band adjacent to the first frequency band in the switching order corresponding to the multiple preset frequency bands.

[0093] In one possible design, the frequency band of the second terminal device is periodically switched between the multiple preset frequency bands; the second information also includes the switching periods corresponding to the multiple preset frequency bands.

[0094] In one possible design, the overlapping area between the multiple preset frequency bands includes a second frequency band; the processing unit calls the transceiver unit to execute: when sending the first information to the second terminal device, sending the first information to the second terminal device on the second frequency band.

[0095] In one possible design, the multiple preset frequency bands are two frequency bands, and the overlapping area of ​​the two frequency bands is the second frequency band.

[0096] In one possible design, the first information carries request information for inquiring about the frequency band of the second terminal device, and the second information includes information carrying the first frequency band.

[0097] In one possible design, the processing unit calls the transceiver unit to execute: when the first terminal device sends the first information to the second terminal device, the first information is sent to the second terminal device respectively on the multiple preset frequency bands; the processing unit calls the transceiver unit to execute: when receiving the second information from the second terminal device, the second information from the second terminal device is received on the first frequency band.

[0098] In one possible design, the multiple preset frequency bands include three or more preset frequency bands, and the three or more preset frequency bands do not overlap.

[0099] In the ninth aspect, an embodiment of the present application provides a communication device, which includes: a processing unit and a transceiver unit; the processing unit calls the transceiver unit to execute: receiving first information from a first terminal device, the first information is used to obtain the frequency band of the second terminal device; the frequency band of the second terminal device is switched between multiple preset frequency bands; sending second information to the first terminal device, the second information indicates a first frequency band, the first frequency band is one of the multiple preset frequency bands; receiving data from the first terminal device on the first frequency band.

[0100] In one possible design, the processing unit calls the transceiver unit to execute: when receiving data from the first terminal device on the first frequency band, receiving data from the first terminal device on the first frequency band within the remaining time corresponding to the first frequency band; or, after the remaining time corresponding to the first frequency band, receiving data from the first terminal device on a third frequency band, the third frequency band being the next frequency band adjacent to the first frequency band in the switching order corresponding to the multiple preset frequency bands.

[0101] In one possible design, the overlapping area between the multiple preset frequency bands includes a second frequency band; the processing unit calls the transceiver unit to execute: when receiving the first information from the first terminal device, receiving the first information from the first terminal device on the second frequency band.

[0102] In one possible design, the processing unit calls the transceiver unit to execute: when receiving the first information from the first terminal device, receiving the first information from the first terminal device on the first frequency band.

[0103] In the tenth aspect, an embodiment of the present application provides a communication device, which includes: a processing unit and a transceiver unit; wherein, the processing unit determines a first frequency band based on a first parameter; the first parameter is associated with a plurality of preset frequency bands, the second terminal device switches between the plurality of preset frequency bands, and the first frequency band is one of the plurality of preset frequency bands; the transceiver unit sends data to the second terminal device on the first frequency band.

[0104] In one possible design, the first parameter is the direct frame number DFN carried in the physical direct broadcast channel PSBCH sent by the synchronization source.

[0105] In one possible design, the processing unit is configured to, when determining the first frequency band according to the first parameter, determine a label s of the first frequency band according to the first parameter, wherein: k is a preset positive integer, and N is the number of the plurality of preset frequency bands.

[0106] The technical effects that can be achieved in the sixth to tenth aspects mentioned above can refer to the technical effects that can be achieved by the corresponding designs in the first to fifth aspects mentioned above, and will not be repeated here.

[0107] In an eleventh aspect, an embodiment of the present application provides a communication device, which may include a processing unit, a sending unit, and a receiving unit. It should be understood that the sending unit and the receiving unit here may also be transceiver units. When the device is a terminal device, the processing unit may be a processor, and the sending unit and the receiving unit may be a transceiver; the device may also include a storage unit, and the storage unit may be a memory; the storage unit is used to store instructions, and the processing unit executes the instructions stored in the storage unit to cause the network device to execute the method in any possible design of the first aspect, the second aspect, the third aspect, the fourth aspect, or the fifth aspect. When the device is a chip in a terminal device, the processing unit may be a processor, and the sending unit and the receiving unit may be an input / output interface, a pin, or a circuit, etc.; the processing unit executes the instructions stored in the storage unit to cause the chip to execute the method in any possible design of the first aspect, the second aspect, the third aspect, the fourth aspect, or the fifth aspect. The storage unit is used to store instructions. The storage unit can be a storage unit within the chip (for example, a register, a cache, etc.), or a storage unit within the network device that is located outside the chip (for example, a read-only memory, a random access memory, etc.).

[0108] In the twelfth aspect, the present application also provides a computer-readable storage medium, which stores a computer program. When the computer program runs on a computer, it enables the computer to execute the method of the first aspect, the second aspect, the third aspect, the fourth aspect, or the fifth aspect mentioned above.

[0109] In a thirteenth aspect, the present application also provides a computer program product comprising a program, which, when executed on a computer, enables the computer to execute the method of the first aspect, the second aspect, the third aspect, the fourth aspect, or the fifth aspect mentioned above.

[0110] In the fourteenth aspect, the present application also provides a communication device, comprising a processor and a memory; the memory is used to store computer-executable instructions; the processor is used to execute the computer-executable instructions stored in the memory, so that the communication device performs the method of the above-mentioned first aspect or second aspect or third aspect or fourth aspect or fifth aspect.

[0111] In the fifteenth aspect, the present application also provides a communication device, comprising a processor and an interface circuit; the interface circuit is used to receive code instructions and transmit them to the processor; the processor runs the code instructions to execute the method of the above-mentioned first aspect or second aspect or third aspect or fourth aspect or fifth aspect. BRIEF DESCRIPTION OF THE DRAWINGS

[0112] Figure 1 Schematic diagram of the sensing mechanism in an embodiment of the present application;

[0113] Figure 2 A schematic diagram of an application scenario of an embodiment of the present application;

[0114] Figure 3 Schematic diagram of part of the sensing mechanism in the embodiment of this application;

[0115] Figure 4 This is one of the flow charts summarizing a communication method in an embodiment of the present application;

[0116] Figure 5 This is one of the schematic diagrams of the first frequency band and the second frequency band in the embodiment of the present application;

[0117] Figure 6 This is the second schematic diagram of the first frequency band and the second frequency band in the embodiment of the present application;

[0118] Figure 7 This is a flow chart of VRU switching frequency bands in an embodiment of the present application;

[0119] Figure 8 This is a second flow chart outlining a communication method according to an embodiment of the present application;

[0120] Figure 9 This is one of the schematic diagrams of the overlapping area of ​​two frequency bands in an embodiment of the present application;

[0121] Figure 10 This is a second schematic diagram of the overlapping area of ​​two frequency bands in an embodiment of the present application;

[0122] Figure 11 This is one of the schematic diagrams of the perception pattern in the embodiment of the present application;

[0123] Figure 12 This is one of the flow charts of a VRU switching between multiple preset frequency bands in an embodiment of the present application;

[0124] Figure 13 This is the second flow chart of the VRU switching between multiple preset frequency bands in an embodiment of the present application;

[0125] Figure 14 This is a third flow chart outlining a communication method according to an embodiment of the present application;

[0126] Figure 15 This is the second schematic diagram of the perception pattern in the embodiment of the present application;

[0127] Figure 16 This is one of the structural diagrams of a communication device in an embodiment of the present application;

[0128] Figure 17 This is the second structural diagram of a communication device in an embodiment of the present application. DETAILED DESCRIPTION

[0129] The embodiments of the present application are described below with reference to the accompanying drawings.

[0130] The network elements involved in the embodiments of the present application are described below.

[0131] Considering Uu air interface transmission, the network elements of wireless communication include network equipment and terminal equipment. Considering sidelink air interface transmission, the network elements of wireless communication are all terminal equipment. In the traditional universal mobile telecommunications system (UMTS) and / or long term evolution (LTE) system, the network equipment can be a traditional macro base station (evolved node B, eNB). In the heterogeneous network (HetNet) scenario, the network equipment can be a micro base station. In the distributed base station scenario, the network equipment can be a baseband processing unit (BBU) and a remote radio unit (RRU). In the cloud radio access network (CRAN) scenario, the network equipment can be a baseband pool (BBU pool) and RRU. In future wireless communication systems, the network equipment can be a next-generation NodeB (gNB). The terminal device can be an on-board communication module or other embedded communication module, or it can be a user's handheld communication device, including a mobile phone, tablet computer, etc.

[0132] The terminal devices primarily involved in the embodiments of this application may include, but are not limited to, the following: vehicle user terminals (VUEs), person user terminals (PUEs), or vulnerable roadside users (VRUs). VRUs may include PUEs. It should be understood that the following embodiments use VUEs and VRUs as examples only and are not intended to limit the embodiments of this application.

[0133] For example, Figure 2As shown in the figure, UE-A and UE-B are two VUEs. UE-A and UE-B can communicate with each other, and UE-A and UE-B can also communicate with each other's VRUs. The VRUs are within the coverage area of ​​UE-A and UE-B and can detect resource occupancy through a sensing mechanism.

[0134] For example, when a user is using a terminal device such as a mobile phone, tablet computer (PAD) or smart wearable device, taking a mobile phone as an example, the mobile phone is within the coverage range of the vehicle terminal. The mobile phone can communicate with the vehicle terminal and obtain resource occupation information through the perception mechanism.

[0135] The perception mechanism is described below.

[0136] For periodic services introduced in Release 14, terminal devices can detect the presence of periodic services through a sensing mechanism, thereby identifying whether the periodic resources corresponding to the periodic services are occupied. The interval between periodic resources is marked as a gap. The gap is generally an integer multiple of 100ms, and in rare cases, 20ms and 50ms can be selected.

[0137] It should be understood that the data packet includes a control information portion and a data information portion. Taking the first terminal device as an example, when the target device of the data packet is the first terminal device, the first terminal device receives the data packet, and the first terminal device parses the control information portion and the data information portion of the data packet. When the target device of the data packet is not the first terminal device, the first terminal device can sense the data packet within the sensing window. Specifically, the first terminal device can sense the data packet within the sensing window, which means that the first terminal device detects the data packet within the sensing window and parses the control information portion of the data packet, but does not parse the data information portion of the data packet. Furthermore. By parsing the control information portion of the data packet, the first terminal device can determine whether the service corresponding to the data packet is a periodic service or a non-periodic service and the position of the reserved resources corresponding to the data packet in the selection window. The first terminal device determines whether the reserved resources corresponding to the data packet are occupied based on the signal strength of the detected data packet.

[0138] like Figure 1 As shown, after determining the time n of the transmission requirement, the terminal device determines a sensing window and a selection window based on the time n.

[0139] The perception window is a number of time slots before time n, in which periodic services or non-periodic services may be transmitted. The selection window includes a number of time slots after time n. In the perception window, the terminal device perceives the periodic service and determines the reservation resources corresponding to the periodic service in the selection window (such as Figure 1 Specifically, the terminal device senses the signal strength of the periodic service and obtains the period of the service, and then estimates the interference intensity of the reserved resources corresponding to the service in the selection window. If the interference intensity is higher than a certain threshold, the resource cannot be used as a subsequent transmission resource for the terminal device, that is, the resource is occupied. If the interference intensity is lower than a certain threshold, the resource can be used as a subsequent transmission resource for the terminal device, that is, the resource is not occupied. Among them, the interval between the resources occupied by each periodic service in the perception window and the reserved resources corresponding to the periodic service in the selection window (such as Figure 1 The gap shown) is a preset period or an integer multiple of the preset period, such as 100ms. Similarly, the terminal device can also perceive non-periodic services within the perception window and determine whether the reserved resources corresponding to the non-periodic services are occupied in the selection window. Among them, the interval between the resources occupied by each non-periodic service in the perception window and the reserved resources corresponding to the non-periodic service in the selection window (hereinafter referred to as the interval corresponding to the non-periodic service) meets the preset non-periodic service interval range, and the intervals corresponding to different non-periodic services can be different, for example, Figure 1 The intervals corresponding to the two non-periodic services in are w1 and w2 respectively.

[0140] For LTE V2X, a partial-sensing mechanism is proposed in the prior art. In this mechanism, the original sensing window is reduced to a part of the original sensing window in the time domain (hereinafter referred to as the partial sensing window), such as Figure 3 Furthermore, when selecting resources, the terminal device only selects from the candidate resources corresponding to a portion of the perception window. Since perception is performed only in a portion of the perception window, only the interference situation of this portion of resources can be obtained, while the interference situation of other resources corresponding to the original perception window is unknown.

[0141] It is understandable that LTE V2X services are all periodic. They sense interference within the previous period and, based on the interference from the previous period, select resources for transmission in the next period where the interference from the previous period is below a preset threshold.

[0142] When the bandwidth of NR V2X increases from 20MHz of LTE V2X to 70-120MHz, even if the above-mentioned partial sensing mechanism is adopted, the power consumption corresponding to the partial sensing mechanism will increase due to the increase in bandwidth.

[0143] At the same time, increasing the NR V2X bandwidth from 20MHz in LTE V2X to 70-120MHz not only increases terminal device power consumption but also places higher demands on terminal decoding performance. For example, when the NR V2X bandwidth increases from 20MHz in LTE V2X to 70-120MHz, terminal devices are required to simultaneously perceive a larger spectrum. For example, in LTE V2X scenarios, the perception range of terminal devices is 20MHz, while in NR V2X scenarios, the perception range is 70-100MHz. Therefore, the increased spectrum range required of terminal devices means that more transmissions can be demodulated simultaneously, potentially increasing the decoding capacity by 3 to 7 times or more. This also significantly increases the processing complexity requirements of the chip in hardware.

[0144] Based on this, the embodiment of the present application provides a communication method for solving the problem of increased power consumption corresponding to the perception mechanism caused by increased bandwidth. Figure 4 As shown, the method includes:

[0145] S401: A first terminal device sends first information to a second terminal device on a first frequency band, where the first information is used to instruct the second terminal device to switch from the first frequency band to the second frequency band. In response, the second terminal device senses the first frequency band and receives the first information from the first terminal device on the first frequency band.

[0146] Exemplarily, the first information may be carried via a control channel or a data channel.

[0147] Among them, the first frequency band is a preconfigured frequency band. It can be understood that the first frequency band being a preconfigured frequency band means that the first frequency band is a frequency band specified by the standard. Alternatively, the first frequency band is configured by the network device for the second terminal device. For example, the network device can configure the first frequency band for the second terminal device through a radio resource control (RRC) message or broadcast information. Alternatively, the first terminal device receives second information from the second terminal device, and the second information indicates the first frequency band. For example, the second terminal device sends an RRC message to the first terminal device, and the RRC message is used to notify the first terminal device that the current perception range of the second terminal device is the first frequency band.

[0148] The first frequency band is a preset resource pool, which includes some subchannels from multiple subchannels. Alternatively, the first frequency band includes one or more subchannels. It should be understood that the bandwidth of the first frequency band is not the bandwidth of the entire NR V2X, and the bandwidth of the first frequency band is smaller than the bandwidth of the entire NR V2X. Generally, the bandwidth of the second frequency band is also smaller than the bandwidth of the entire NR V2X. For example, the bandwidth of the entire NR V2X is 70 to 120 MHz. The bandwidth of the first frequency band is smaller than the bandwidth of the second frequency band.

[0149] The first information may use, but is not limited to, the following possible solutions to instruct the second terminal device to switch from the first frequency band to the second frequency band.

[0150] Solution 1: The first information includes information for determining a frequency domain position of the second frequency band.

[0151] Exemplarily, the first information may include an identifier of the second frequency band, a frequency band adjustment amplitude, a starting frequency domain position of the second frequency band, an ending frequency domain position of the second frequency band, a starting subchannel identifier of the second frequency band, an ending subchannel identifier of the second frequency band, and a combination of one or more of the number of physical resource blocks (PRBs) or the number of subchannels corresponding to the second frequency band.

[0152] Example 1: The first information may include an identifier of a second frequency band. The second terminal device may know information about the frequency domain location of at least one frequency band, where the at least one frequency band includes the second frequency band. The second terminal device determines the second frequency band from the at least one frequency band based on the identifier of the second frequency band included in the first information.

[0153] Example 2: The first information includes at least two of the starting frequency domain position of the second frequency band, the ending frequency domain position of the second frequency band, and the number of physical resource blocks (PRBs) corresponding to the second frequency band. For example, when the first information includes the starting frequency domain position of the second frequency band and the ending frequency domain position of the second frequency band, the second terminal device determines the second frequency band based on the starting frequency domain position of the second frequency band and the ending frequency domain position of the second frequency band. For example, when the first information includes the starting frequency domain position of the second frequency band and the number of physical resource blocks corresponding to the second frequency band, the second terminal device determines the second frequency band based on the starting frequency domain position of the second frequency band and the number of physical resource blocks corresponding to the second frequency band. For another example, when the first information includes the ending frequency domain position of the second frequency band and the number of physical resource blocks corresponding to the second frequency band, the second terminal device determines the second frequency band based on the ending frequency domain position of the second frequency band and the number of physical resource blocks corresponding to the second frequency band.

[0154] Example 3: The first information includes at least two of the starting subchannel identifier of the second frequency band, the ending subchannel identifier of the second frequency band, and the number of subchannels corresponding to the second frequency band. For example, when the first information includes the starting subchannel identifier of the second frequency band and the ending subchannel identifier of the second frequency band, the second terminal device determines the second frequency band based on the starting subchannel identifier of the second frequency band and the ending subchannel identifier of the second frequency band. For example, when the first information includes the starting subchannel identifier of the second frequency band and the number of subchannels corresponding to the second frequency band, the second terminal device determines the second frequency band based on the starting subchannel identifier of the second frequency band and the number of subchannels corresponding to the second frequency band. For another example, when the first information includes the ending subchannel identifier of the second frequency band and the number of subchannels corresponding to the second frequency band, the second terminal device determines the second frequency band based on the ending subchannel identifier of the second frequency band and the number of subchannels corresponding to the second frequency band.

[0155] Example 4: The first information includes a frequency band adjustment amplitude. In this case, the second terminal device determines the second frequency band according to the first frequency band and the frequency band adjustment amplitude.

[0156] It should be understood that the above examples are not intended to limit the embodiments of the present application.

[0157] Solution 2: The first information includes the amount of data that the first terminal device needs to transmit.

[0158] In addition, the first information may further include a first preset value. Alternatively, the network device or the first terminal device may send the first preset value to the second terminal device before the second terminal device receives the first information. The first preset value is a measure of the amount of data, for example, 100 bits. Alternatively, the first terminal device and the second terminal device may store a default first preset value.

[0159] When the first information includes the amount of data required to be transmitted by the first terminal device, the second terminal device can determine whether the amount of data required to be transmitted by the first terminal device is greater than the first preset value based on the first information. If the amount of data required to be transmitted by the first terminal device is greater than the first preset value, the second terminal device switches from the first frequency band to the second frequency band and performs perception on the second frequency band. If the amount of data required to be transmitted by the first terminal device is less than the first preset value, the second terminal device continues to perform perception on the first frequency band. It can be understood that the first terminal device is aware of the amount of data required to be transmitted by the first terminal device and the first preset value. Therefore, when the amount of data required to be transmitted by the first terminal device is less than the first preset value, the first terminal device can determine that the second terminal device continues to perform perception on the first frequency band, that is, the second terminal device operates on the first frequency band. The first terminal device can send data to the second terminal device on the first frequency band.

[0160] Furthermore, if the amount of data required to be transmitted by the first terminal device is equal to a first preset value, the second terminal device may switch from the first frequency band to the second frequency band and perform sensing on the second frequency band, or the second terminal device may continue to perform sensing on the first frequency band. Specifically, whether the second terminal device needs to switch from the first frequency band to the second frequency band when the amount of data required to be transmitted by the first terminal device is equal to the first preset value may be determined through protocol provisions or through negotiation between the second terminal device and the first terminal device.

[0161] The second frequency band is the default frequency band to which the second terminal device switches. The second terminal device stores information used to determine the frequency domain location of the second frequency band. The network device or the first terminal device may send information used to determine the frequency domain location of the second frequency band to the second terminal device before the second terminal device receives the first information. Alternatively, the second frequency band is a preconfigured frequency band. It is understood that the second frequency band being a preconfigured frequency band means that the second frequency band is a frequency band specified by the standard.

[0162] By adopting the above-mentioned solution 2, the second terminal device can independently determine whether it needs to switch the frequency band based on the first information.

[0163] Solution 3: The first information instructs the second terminal device to switch frequency band.

[0164] When the second terminal device receives the first information from the first terminal device, the second terminal device switches from the first frequency band to the second frequency band. The second frequency band is the default frequency band to which the second terminal device switches. The second terminal device stores information for determining the frequency domain position of the second frequency band. The network device or the first terminal device may send information for determining the frequency domain position of the second frequency band to the second terminal device before the second terminal device receives the first information. Alternatively, the second frequency band is a preconfigured frequency band. It is understood that the second frequency band being a preconfigured frequency band means that the second frequency band is a frequency band specified by the standard.

[0165] Exemplarily, the second terminal device senses in the first frequency band before receiving the first information, such as Figure 5As shown, the second terminal device senses on the resources shown in the white area on the left, the frequency domain range corresponding to the white area on the left is the first frequency band, and the second terminal device receives the first information on the resources shown in the striped area on the left. When the first information includes information for determining the frequency domain position of the second frequency band, the second terminal device determines the second frequency band after receiving the first information and senses in the second frequency band. When the first information includes the amount of data required to be transmitted by the first terminal device, the second terminal device makes a judgment based on the amount of data required to be transmitted by the first terminal device and the first preset value. If the amount of data required to be transmitted by the first terminal device is greater than the first preset value, the second terminal device needs to switch from the first frequency band to the second frequency band after receiving the first information, otherwise the second terminal device does not need to switch frequency bands. When the first information instructs the second terminal device to switch frequency bands, the second terminal device switches from the first frequency band to the second frequency band. As shown Figure 5 As shown, after the second terminal device switches to the second frequency band, it senses on the time-frequency resources shown in the white area on the right. The frequency domain range corresponding to the white area on the right is the second frequency band. The second terminal device can receive data from the first terminal device on the time-frequency resources shown in the striped area on the right. It can be understood that the width of the striped area on the right can be equal to or less than the width of the striped area on the right, that is, the bandwidth of the frequency band used by the first terminal device to actually send data can be equal to or less than the bandwidth of the second frequency band. The time interval between the white area on the left and the white area on the right can be determined based on the frequency band switching delay of the second terminal device, or based on the remaining time corresponding to the first frequency band and the frequency band switching delay of the second terminal device.

[0166] Furthermore, based on the three possible solutions described above, in some embodiments, when the first terminal device determines that the amount of data required to be transmitted by the first terminal device is greater than a first preset value, the first terminal device transmits first information to the second terminal device on the first frequency band. When the first terminal device determines that the amount of data required to be transmitted by the first terminal device is less than or equal to the first preset value, the first terminal device does not transmit the first information. In this case, the first terminal device may transmit data to the second terminal device on the first frequency band. The network device may transmit the first preset value to the first terminal device.

[0167] In addition, in some embodiments, the first information may also include information about the time domain resources used by the first terminal device to transmit data.

[0168] Exemplarily, the first information indicates the time domain information of the first resource and the frequency domain information of the first resource. The first resource is used by the first terminal device to send data to the second terminal device. The frequency domain information indicates the second frequency band. The time domain information is determined based on the frequency band switching delay of the second terminal device. Specifically, when determining the first resource, the first terminal device may consider the processing delay required for the first information and the frequency band switching delay of the second terminal device, that is, the first terminal device may determine the time domain information of the first resource based on the processing delay required for the first information and the frequency band switching delay of the second terminal device. For example, the time interval between the resource carrying the first information and the first resource is greater than or equal to the sum of the processing delay required for the first information and the frequency band switching delay of the second terminal device. The first terminal device receives the frequency band switching delay of the second terminal device from the second terminal device. The first terminal device may also receive information about the type or capability of the second terminal device from the second terminal device. The first terminal device determines the processing delay required for the second terminal device to process the first information based on the type or capability of the second terminal device. The frequency band switching delay of the second terminal device and the information about the type or capability of the second terminal device may be carried by an RRC message or sidelink control information (SCI). The frequency band switching delay of the second terminal device and the information of the type or capability of the second terminal device can be sent separately or together. For example, the frequency band switching delay of the second terminal device and the information of the type or capability of the second terminal device can be sent by the second terminal device to the first terminal device when the first terminal device and the second terminal device establish communication.

[0169] exist Figure 6 In the figure, the second terminal device first senses the time domain resources shown in the white area on the left. The frequency domain range corresponding to the white area on the left is the first frequency band. The second terminal device receives the first information on the time-frequency resources shown in the striped area on the left. The first information indicates the time domain information of the first resource and the frequency domain information of the first resource. The time interval between the resource carrying the first information and the first resource indicated by the first information can be the sum of the processing delay required for the first information and the frequency band switching delay of the second terminal device, as shown in FIG. Figure 6 After receiving the first information, the second terminal device switches the frequency band according to the first information. The second terminal device receives data from the first terminal device on the time-frequency resource (i.e., the first resource) shown in the striped area on the right.

[0170] Furthermore, it should be noted that the second terminal device can complete the frequency band switching before reaching the time domain resource based on the information of the time domain resource used by the first terminal device to transmit data. For example, the second terminal device can perform the frequency band switching immediately after receiving the first information. For another example, the second terminal device can determine the latest time point for switching the frequency band based on its own frequency band switching delay, and start frequency band switching when the latest time point is reached. At this time, compared with the switching method in which the second terminal device performs frequency band switching earlier than the latest time point, the second terminal device performs frequency band switching at the latest time point, which can further save the power consumption of the second terminal device. For another example, the second terminal device can also determine the time point for starting the frequency band switching in combination with the time required for the periodic interruption of the frequency band.

[0171] S402: The first terminal device sends data to the second terminal device on the second frequency band. Correspondingly, the second terminal device senses on the second frequency band and receives data from the second terminal device on the second frequency band.

[0172] Exemplarily, when the first information does not include information about the time domain resources used by the first terminal device to transmit data (for example, the first information includes information for determining the frequency domain position of the second frequency band, or when the first information includes the amount of data required to be transmitted by the first terminal device and the amount of data required to be transmitted by the first terminal device is greater than a first preset value, or when the first information indicates that the second terminal device switches the frequency band), the first terminal device may send data to the second terminal device on the second frequency band after the frequency band switching delay. Alternatively, the first terminal device sends data to the second terminal device on the second frequency band after the frequency band switching delay and the remaining time, where the remaining time is the remaining usage time corresponding to the first frequency band. Exemplarily, the second terminal device may notify the first terminal device of the remaining time of the first frequency band. The first terminal device sends data to the second terminal device on the second frequency band after the frequency band switching delay and the remaining time.

[0173] Exemplarily, when the first information indicates the time domain information of the first resource and the frequency domain information of the first resource, the first resource is used by the first terminal device to send data to the second terminal device, and the first terminal device receives data from the second terminal device on the first resource according to the time domain information of the first resource and the frequency domain information of the first resource indicated by the first information.

[0174] In addition, in some embodiments, after the second terminal device receives data from the first terminal device on the second frequency band, that is, after the first terminal device completes data transmission, the second terminal device switches from the second frequency band to the first frequency band. Specifically, after the second terminal device receives data from the first terminal device, the second terminal device sends an acknowledgment (ACK) message to the first terminal device. After sending the acknowledgment message to the first terminal device, the second terminal device switches from the second frequency band back to the first frequency band. Using the above method, after the first terminal device completes data transmission on the larger bandwidth, the second terminal device can switch back to the smaller frequency band for perception, thereby further saving power consumption of the terminal device.

[0175] In summary, using Figure 4 In the embodiment shown, a first terminal device sends a first message to a second terminal device, and the second terminal device can switch from a smaller bandwidth to a larger bandwidth to operate, thereby meeting the demand for high throughput and solving the problem of high power consumption and high complexity caused by the second terminal device always perceiving at a large bandwidth. When a user is using a terminal device such as a mobile phone, a PAD, or a smart wearable device, taking a mobile phone as an example, the mobile phone is within the coverage of the vehicle terminal, and the mobile phone can communicate with the vehicle terminal. The mobile phone can operate at a smaller bandwidth and receive the first message sent by the vehicle terminal through the smaller bandwidth, and the first message indicates switching from a smaller bandwidth to a larger bandwidth. Furthermore, the mobile phone switches from a smaller bandwidth to a larger bandwidth according to the first information, and the vehicle terminal can send data to the mobile phone at the larger bandwidth, thereby meeting the demand for high throughput and avoiding the high power consumption and high processing complexity caused by the mobile phone always perceiving at a larger bandwidth.

[0176] The following Figure 7 Take an example Figure 4 The specific process of the embodiment shown.

[0177] S701: The VRU sends first information to UE-A, where the first information indicates a first frequency band and a frequency band switching delay of the VRU.

[0178] It is understandable that S701 is an optional step. UE-A can also obtain the first frequency band and the frequency band switching delay of the VRU in other ways, see Figure 4 The relevant descriptions in the illustrated embodiments will not be repeated any more.

[0179] S702: The VRU performs sensing in the first frequency band.

[0180] S703: UE-A sends second information to the VRU, where the second information instructs the VRU to switch from the first frequency band to the second frequency band. Correspondingly, the VRU switches from the first frequency band to the second frequency band according to the second information.

[0181] Exemplarily, when UE-A determines that the data flow to be sent by UE-A is greater than a preset value, UE-A sends the second information to the VRU in the first frequency band.

[0182] S704: The VRU performs sensing in the second frequency band.

[0183] Specifically, the VRU switches the first frequency band to the second frequency band according to the second information in S703.

[0184] S705: UE-A sends data to the VRU on the second frequency band.

[0185] By adopting the above method, the VRU switches from the first frequency band to the second frequency band according to the instruction of UE-A, which can meet the demand for high throughput and solve the problems of high power consumption and high complexity caused by the VRU always sensing in a large bandwidth.

[0186] Based on this, the embodiment of the present application provides a communication method for solving the problem of increased power consumption corresponding to the perception mechanism caused by increased bandwidth. Figure 8 As shown, the method includes:

[0187] S801: A first terminal device sends first information to a second terminal device, where the first information is used to obtain a frequency band of the second terminal device. The frequency band of the second terminal device is switched between a plurality of preset frequency bands.

[0188] Exemplarily, the first information may be carried via a control channel or a data channel.

[0189] It is understandable that the frequency band of the second terminal device can be switched periodically or aperiodically between multiple preset frequency bands.

[0190] Among them, the multiple preset frequency bands can be pre-configured frequency bands, that is, frequency bands specified by the standard. Alternatively, the multiple preset frequency bands are configured by the network device for the second terminal device. For example, the network device can configure multiple preset frequency bands for the second terminal device through RRC messages or broadcast information. The multiple preset frequency bands are different from each other. Among them, each frequency band can be a preset resource pool, and the preset resource pool includes some subchannels in multiple subchannels. Alternatively, each frequency band includes one or more subchannels. It should be understood that the bandwidth of each frequency band is not the bandwidth of the entire NR V2X, and the bandwidth of each frequency band is smaller than the bandwidth of the entire NR V2X. For example, the bandwidth of the entire NR V2X is 70 to 120 MHz. It can be understood that the bandwidth size of each preset frequency band can be the same or different.

[0191] In addition, in some embodiments, when the first terminal device determines that the amount of data required to be transmitted by the first terminal device is greater than a first preset value, the first terminal device sends the first information to the second terminal device. When the first terminal device determines that the amount of data required to be transmitted by the first terminal device is less than or equal to the first preset value, the first terminal device may not send the first information.

[0192] S802: The second terminal device sends second information to the first terminal device, where the second information indicates a first frequency band, which is one of a plurality of preset frequency bands.

[0193] Exemplarily, the second information may be carried via a control channel or a data channel.

[0194] In addition, the second information may also indicate the remaining duration corresponding to the first frequency band. When the frequency band of the second terminal device periodically switches between multiple preset frequency bands, the second information may also include the switching periods corresponding to the multiple preset frequency bands.

[0195] S803: The first terminal device sends data to the second terminal device on the first frequency band.

[0196] For example, the first terminal device transmits data to the second terminal device on the first frequency band within the remaining duration corresponding to the first frequency band. If the first terminal device does not complete the data transmission within the remaining duration corresponding to the first frequency band, the first terminal device may transmit data to the second terminal device on a third frequency band, where the third frequency band is the next frequency band adjacent to the first frequency band in the switching order corresponding to the plurality of preset frequency bands.

[0197] For example, Figure 9 As shown, the multiple preset frequency bands include a first preset frequency band and a second preset frequency band. UE1 sends data to UE2 on the first preset frequency band. If the first terminal device fails to complete the data transmission within the remaining time corresponding to the first preset frequency band, it can continue to send data to the second terminal device on the second preset frequency band.

[0198] It can be understood that if UE1 knows that the next frequency band adjacent to the first preset frequency band is the second preset frequency band, UE1 can send data to UE2 within the remaining time corresponding to the first preset frequency band. When UE1 has not completed data transmission, UE1 continues to send data to UE2 on the second preset frequency band after UE2's frequency band switching delay. Among them, UE2's frequency band switching delay is the time required for UE2 to perform frequency band switching. Exemplarily, UE1 can obtain the frequency band switching delay corresponding to UE2 and the order in which UE2 switches frequency bands through a network device or UE2. If UE1 does not know that the next frequency band adjacent to the first preset frequency band is the second preset frequency band, UE1 can send data to UE2 within the remaining time corresponding to the first preset frequency band. When UE1 has not completed data transmission, UE1 repeats the above S801 to S803.

[0199] For example, Figure 11 As shown, multiple preset frequency bands include frequency band 0 to frequency band 3. UE1 sends data to UE2 in frequency band 0. If the first terminal device fails to complete data transmission within the remaining time corresponding to frequency band 0, it can continue to send data to the second terminal device on frequency band 1.

[0200] It can be understood that if UE1 knows that the next frequency band adjacent to band 0 is band 1, UE1 can send data to UE2 within the remaining time corresponding to band 0. When UE1 has not completed data transmission, UE1 continues to send data to UE2 on band 1 after UE2's band switching delay. Among them, UE2's band switching delay is the time required for UE2 to perform band switching. Exemplarily, UE1 can obtain the band switching delay corresponding to UE2 and the order in which UE2 switches bands through a network device or UE2. If UE1 does not know that the next frequency band adjacent to band 0 is band 1, UE1 can send data to UE2 within the remaining time corresponding to band 0. When UE1 has not completed data transmission, UE1 repeats the above S801 to S803.

[0201] In some embodiments, the overlapping portion of the multiple preset frequency bands is a second frequency band. In this case, with respect to S801, the first terminal device transmits the first information to the second terminal device on the second frequency band. Correspondingly, the second terminal device receives the first information from the first terminal device on the second frequency band. The bandwidth of the second frequency band is smaller than the bandwidth of each of the preset frequency bands.

[0202] Exemplarily, the number of the plurality of preset frequency bands is two, and the overlapping area of ​​the two preset frequency bands is the second frequency band. Figure 9 As shown, the two preset frequency bands are both continuous frequency bands, and the overlapping area of ​​the two frequency bands is the second frequency band. Figure 9 The design shown can reduce the complexity of terminal device perception because the two preset frequency bands are continuous frequency bands.

[0203] It is understandable that if Figure 10 As shown, any one or more of the two preset frequency bands can also be non-continuous frequency bands. Figure 10 In FIG, the two frequency bands marked by bold lines are a preset frequency band, ie, a second preset frequency band, and the second preset frequency band is a non-continuous frequency band.

[0204] In this case, the first information carries request information for inquiring about the frequency band of the second terminal device, and the second information carries information about the first frequency band. Exemplarily, the second information includes a combination of one or more of the identifier of the first frequency band, the starting frequency domain position of the first frequency band, the ending frequency domain position of the first frequency band, the starting subchannel identifier of the first frequency band, the ending subchannel identifier of the first frequency band, and the number of PRBs or subchannels corresponding to the first frequency band.

[0205] Example 1: The first information may include an identifier of a first frequency band. The second terminal device may know information about the frequency domain locations of multiple preset frequency bands, where the multiple preset frequency bands include the first frequency band. The second terminal device determines the first frequency band from the multiple preset frequency bands based on the identifier of the first frequency band included in the first information.

[0206] Example 2: The first information includes at least two of the starting frequency domain position of the first frequency band, the ending frequency domain position of the first frequency band, and the number of PRBs corresponding to the first frequency band. For example, when the first information includes the starting frequency domain position of the first frequency band and the ending frequency domain position of the first frequency band, the second terminal device determines the first frequency band based on the starting frequency domain position of the first frequency band and the ending frequency domain position of the first frequency band. For example, when the first information includes the starting frequency domain position of the first frequency band and the number of physical resource blocks corresponding to the first frequency band, the second terminal device determines the first frequency band based on the starting frequency domain position of the first frequency band and the number of physical resource blocks corresponding to the first frequency band. For another example, when the first information includes the ending frequency domain position of the first frequency band and the number of physical resource blocks corresponding to the first frequency band, the second terminal device determines the first frequency band based on the ending frequency domain position of the first frequency band and the number of physical resource blocks corresponding to the first frequency band.

[0207] Example 3: The first information includes at least two of the starting subchannel identifier of the first frequency band, the ending subchannel identifier of the first frequency band, and the number of subchannels corresponding to the first frequency band. For example, when the first information includes the starting subchannel identifier of the first frequency band and the ending subchannel identifier of the first frequency band, the second terminal device determines the first frequency band based on the starting subchannel identifier of the first frequency band and the ending subchannel identifier of the first frequency band. For example, when the first information includes the starting subchannel identifier of the first frequency band and the number of subchannels corresponding to the first frequency band, the second terminal device determines the first frequency band based on the starting subchannel identifier of the first frequency band and the number of subchannels corresponding to the first frequency band. For another example, when the first information includes the ending subchannel identifier of the first frequency band and the number of subchannels corresponding to the first frequency band, the second terminal device determines the first frequency band based on the ending subchannel identifier of the first frequency band and the number of subchannels corresponding to the first frequency band.

[0208] It should be understood that the above examples are not intended to limit the embodiments of the present application.

[0209] Since the first terminal device does not know which preset frequency band of the multiple preset frequency bands the second terminal device is currently operating on, but the first terminal device knows the overlapping area of ​​the multiple preset frequency bands of the second terminal device (i.e., the second frequency band), when the first terminal device sends the first information to the second terminal device (the first information is the first information sent by the first terminal device to the second terminal device), the first terminal device sends the first information to the second terminal device on the second frequency band. After the first terminal device receives the second information from the second terminal device, the first terminal device learns that the frequency band currently operating the second terminal device is the first frequency band. At this time, the first terminal device can select all or part of the resources in the first frequency band to send data or messages to the second terminal device, wherein part of the resources in the first frequency band may include the second frequency band or may not include the second frequency band, and this embodiment of the present application does not limit this.

[0210] By adopting the above method, the second terminal device switches between multiple preset frequency bands without the need for the first terminal device to send a frequency band switching trigger message, thereby solving the problems of high power consumption and high complexity caused by perception at a large bandwidth.

[0211] In other embodiments, with respect to S801, the first terminal device sends the first information to the second terminal device on multiple preset frequency bands. Accordingly, the second terminal device receives the first information from the first terminal device on the first frequency band, and the second terminal device may send the second information on the first frequency band. It is understandable that the second information may include an identifier of the first frequency band. The second information may be fed back via a physical sidelink feedback channel (PSFCH). The second information may also carry the remaining duration of the first frequency band.

[0212] Exemplarily, the multiple preset frequency bands include two or more preset frequency bands, and the two or more preset frequency bands do not overlap. Of course, there may also be overlapping areas between the two or more preset frequency bands, which is not limited in the embodiments of the present application. The multiple preset frequency bands here may also be referred to as perception patterns. The perception pattern may be preconfigured. Optionally, the sum of the multiple preset frequency bands may constitute the entire NR V2X frequency band or part of the entire NR V2X frequency band, and the bandwidths of the multiple preset frequency bands may be the same or different. Among them, when the sum of the multiple preset frequency bands can constitute the entire NR V2X frequency band, the effect of full-band perception can be achieved, and the effect of diversity gain can be obtained.

[0213] like Figure 11As shown, the number of the multiple preset frequency bands is four, there is no overlapping area between the four preset frequency bands, and these four frequency bands constitute the entire NR V2X frequency band, and the bandwidth of the four preset frequency bands is the same. It can be understood that the second terminal device can perform periodic switching or non-periodic switching between the four resource pools in turn. For example, in Figure 11 In the example, the second terminal device only senses on 1 / 4 of the frequency band at each moment. After a period of time, it switches to sensing on the other 1 / 4 of the frequency band, and continues to periodically switch. The first terminal device sends the first information on each of the four preset frequency bands. Since the second terminal device is currently sensing on frequency band 1, the second terminal device will receive the first information on frequency band 1 and send the second information to the first terminal device. By receiving the second information, the first terminal device can learn about frequency band 1.

[0214] It should be understood that Figure 11 For example, when the first terminal device sends the first information on four preset frequency bands respectively, for each preset frequency band, the first terminal device can occupy the entire bandwidth of the preset frequency band to send the first information, or can occupy part of the bandwidth of the preset frequency band to send the first information. For example, the first information is transmitted via Figure 11 Similarly, when the second terminal device sends the second information to the first terminal device, the second terminal device can occupy the entire bandwidth or part of the bandwidth of frequency band 1 to send the second information to the first terminal device. For example, the second information is transmitted via Figure 11 It is carried by the physical sidelink feedback channel (PSFCH) in the IEEE 802.11ac network.

[0215] Using this method, the second terminal device can switch between multiple preset frequency bands, thereby achieving a wider frequency band perception effect, which can solve the problems of high power consumption and high complexity caused by perception in a larger bandwidth. Due to the increase in optional transmission resources (i.e., the presence of multiple preset frequency bands), the technical effect of diversity gain can also be achieved.

[0216] The following Figure 9 and Figure 12 Take an example Figure 8 A possible process of the embodiment shown is shown. Figure 9 As shown, the VRU periodically switches between the first preset frequency band and the second preset frequency band.

[0217] S1201: The VRU senses on a first preset frequency band and periodically switches the sensing range (ie, periodically switches between the first preset frequency band and the second preset frequency band).

[0218] S1202: UE-A sends first information to the VRU, where the first information is used to obtain the sensing range of the VRU.

[0219] Specifically, UE-A knows Figure 9 The overlapping area of ​​the two preset frequency bands is detected, and the first information is sent to the VRU in the overlapping area. For example, the UE-A can obtain the time-frequency resource information of the overlapping area through network device configuration or pre-configuration.

[0220] S1203: The VRU sends second information to UE-A. The second information indicates that the VRU's sensing range is the first preset frequency band and the remaining duration of the first preset frequency band. Furthermore, the second information may also indicate a frequency band switching period and a frequency band switching delay. It should be understood that UE-A may also obtain the frequency band switching period and the frequency band switching delay through other means, which are not limited in this embodiment of the present application.

[0221] S1204: After receiving the second information, UE-A sends data to the VRU on the first preset frequency band.

[0222] At the same time, if UE-A also learns the remaining duration corresponding to the first preset frequency band through the second information, UE-A may send data to the VRU according to the remaining duration.

[0223] By adopting the above method, the VRU switches between multiple preset frequency bands without the need for UE-A to send a frequency band switching trigger message, thereby avoiding the high power consumption and high complexity problems caused by the VRU sensing in a large bandwidth.

[0224] The following Figure 11 and Figure 13 Take an example Figure 8 Another possible process of the embodiment shown. It is understandable that only Figure 11 Take this as an example to illustrate. Figure 11 The number of the plurality of preset frequency bands is 4. In practical applications, the number of the plurality of preset frequency bands may also be other numbers, which is not limited in the embodiment of the present application.

[0225] S1301: The VRU currently senses on frequency band 1 and periodically switches the sensing range.

[0226] S1302: UE-A sends first information to four preset frequency bands respectively, where the first information is used to obtain the perception range of the VRU.

[0227] Exemplarily, UE-A sends PSCCH and PSSCH to the VRU, and the first information is carried by the PSCCH and PSSCH.

[0228] S1303: The VRU sends second information to UE-A, where the second information is used to indicate frequency band 1.

[0229] For example, Figure 11 As shown in the thin black vertical frame, the VRU sends a PSFCH to UE-A, and the second information is carried by the PSFCH.

[0230] S1304: The VRU sends the remaining duration corresponding to frequency band 1 to UE-A.

[0231] It is understandable that the remaining duration corresponding to frequency band 1 can be carried in the second information or sent separately.

[0232] S1305: After receiving the second information, UE-A sends data to the VRU on frequency band 1.

[0233] At the same time, if UE-A also learns the remaining duration corresponding to frequency band 1, UE-A sends data to the VRU according to the remaining duration.

[0234] Using this method, the VRU can switch between multiple preset frequency bands, achieving full-bandwidth sensing. This solves the high power consumption and complexity associated with wide-bandwidth sensing. Furthermore, since the VRU switches between multiple preset frequency bands, it increases the available transmission resources and achieves diversity gain.

[0235] The embodiment of the present application also provides a communication method for solving the problem of increased power consumption corresponding to the perception mechanism caused by increased bandwidth. Figure 14 As shown, the method includes:

[0236] S1401A: The first terminal device determines a first frequency band according to a first parameter.

[0237] S1401B: The second terminal device determines the first frequency band according to the first parameter.

[0238] The first parameter is associated with multiple preset frequency bands, the second terminal device switches between the multiple preset frequency bands, and the first frequency band is one of the multiple preset frequency bands.

[0239] It is understandable that the frequency band of the second terminal device can be switched periodically or aperiodically between multiple preset frequency bands.

[0240] Exemplarily, the first parameter is a direct frame number (DFN) carried in a physical sidelink broadcast channel (PSBCH) sent by the synchronization source.

[0241] The first terminal device determines the index s of the first frequency band according to the first parameter, wherein,

[0242]

[0243] k is a preset positive integer, and N is the number of the plurality of preset frequency bands.

[0244] like Figure 15 As shown, the number of the preset frequency bands is 4. Assuming DFN = 3010, k = 1000, then That is, the first terminal device determines that the first frequency band is frequency band 3. The frequency bands are numbered starting from 0, and the value of DFN ranges from 0 to 3999.

[0245] For another example, the first frequency band can also be determined based on the value of DFNmod 4000. When the value is 0 to 999, the first frequency band is band 0; when the value is 1000 to 1999, the first frequency band is band 1; when the value is 2000 to 2999, the first frequency band is band 2; and when the value is 3000 to 3999, the first frequency band is band 3.

[0246] It should be understood that the above-mentioned first parameter may also be other parameters, and the method for determining the first frequency band may also be other methods, which are not limited to the above examples, and the embodiments of the present application do not limit this.

[0247] S1402: The first terminal device sends data to the second terminal device on the first frequency band.

[0248] Using this method, the second terminal device can switch between multiple preset frequency bands, and the first terminal device can determine the second terminal device's current frequency band based on known parameters. This can solve the problems of high power consumption and high complexity associated with sensing over a larger bandwidth. Due to the increased number of available transmission resources, the technical effect of diversity gain can also be achieved.

[0249] It is understood that in order to implement the functions in the above embodiments, the terminal device includes hardware structures and / or software modules corresponding to the execution of each function. Those skilled in the art should readily appreciate that, in combination with the units and method steps of each example described in the embodiments disclosed in this application, this application can be implemented in the form of hardware or a combination of hardware and computer software. Whether a function is executed in hardware or in a manner driven by computer software depends on the specific application scenario and design constraints of the technical solution.

[0250] Figure 16 and Figure 17 Schematic diagram of the structure of possible communication devices provided in the embodiments of the present application. These communication devices can be used to implement the functions of the terminal equipment in the above method embodiments, and thus can also achieve the beneficial effects of the above method embodiments. In the embodiments of the present application, the communication device can be as follows Figure 2 The UE-A or UE-B or VRU shown may also be a module (such as a chip) applied to the UE-A or UE-B or VRU.

[0251] like Figure 16 As shown, the communication device 1600 includes a processing unit 1610 and a transceiver unit 1620. The communication device 1600 is used to implement the above Figure 4 、 Figure 7 、 Figure 8 、 Figure 12 、 Figure 13 or Figure 14 The functionality of the device in the method embodiments is shown.

[0252] When the communication device 1600 is used to implement Figure 4 In the method embodiment shown, the function of the first terminal device is: the processing unit 1610 calls the transceiver unit 1620 to execute sending first information to the second terminal device on the first frequency band, and the first information is used to instruct the second terminal device to switch from the first frequency band to the second frequency band; and send data to the second terminal device on the second frequency band.

[0253] When the communication device 1600 is used to implement Figure 4 When the function of the second terminal device in the method embodiment shown is: the processing unit 1610 calls the transceiver unit 1620 to receive first information from the first terminal device on the first frequency band, and the first information is used to instruct the second terminal device to switch from the first frequency band to the second frequency band; receive data from the first terminal device on the second frequency band.

[0254] When the communication device 1600 is used to implement Figure 8 In the method embodiment shown, the functions of the first terminal device are: the processing unit 1610 calls the transceiver unit 1620 to send first information to the second terminal device, the first information is used to obtain the frequency band of the second terminal device, and the frequency band of the second terminal device switches between multiple preset frequency bands; receives second information from the second terminal device, the second information indicates a first frequency band, and the first frequency band is one of the multiple preset frequency bands; and sends data to the second terminal device on the first frequency band.

[0255] When the communication device 1600 is used to implement Figure 8 When the function of the second terminal device in the method embodiment shown is: the processing unit 1610 calls the transceiver unit 1620 to receive the first information from the first terminal device, and the first information is used to obtain the frequency band of the second terminal device; the frequency band of the second terminal device is switched between multiple preset frequency bands; second information is sent to the first terminal device, and the second information indicates the first frequency band, which is one of the multiple preset frequency bands; data from the first terminal device is received on the first frequency band.

[0256] When the communication device 1600 is used to implement Figure 14 In the method embodiment shown, the function of the first terminal device is: the processing unit 1610 is used to determine the first frequency band based on the first parameter; the first parameter is associated with multiple preset frequency bands, the second terminal device switches between the multiple preset frequency bands, and the first frequency band is one of the multiple preset frequency bands; the transceiver unit 1620 is used to send data to the second terminal device on the first frequency band.

[0257] For more detailed description of the processing unit 1610 and the transceiver unit 1620, please refer to Figure 4 、 Figure 7 、 Figure 8 、 Figure 12 、 Figure 13 or Figure 14 The relevant description in the method embodiment shown is directly obtained and will not be repeated here.

[0258] like Figure 17 As shown, communication device 1700 includes a processor 1710 and an interface circuit 1720. Processor 1710 and interface circuit 1720 are coupled to each other. It will be appreciated that interface circuit 1720 may be a transceiver or an input / output interface. Optionally, communication device 1700 may further include a memory 1730 for storing instructions executed by processor 1710, input data required by processor 1710 to execute instructions, or data generated after processor 1710 executes instructions.

[0259] When the communication device 1700 is used to implement Figure 12 When the method is shown, the processor 1710 is used to implement the functions of the above-mentioned processing unit 1610, and the interface circuit 1720 is used to implement the functions of the above-mentioned transceiver unit 1620.

[0260] When the above-mentioned communication device is a chip applied to a terminal device, the terminal device chip realizes the functions of the terminal device in the above-mentioned method embodiment.

[0261] It is understood that the processor in the embodiments of the present application may be a central processing unit (CPU), or may be other general-purpose processors, digital signal processors (DSP), application-specific integrated circuits (ASIC), field programmable gate arrays (FPGA), or other programmable logic devices, transistor logic devices, hardware components, or any combination thereof. The general-purpose processor may be a microprocessor or any conventional processor.

[0262] The method steps in the embodiments of the present application can be implemented by hardware or by a processor executing software instructions. The software instructions can be composed of corresponding software modules, which can be stored in random access memory (RAM), flash memory, read-only memory (ROM), programmable read-only memory (PROM), erasable programmable read-only memory (EPROM), electrically erasable programmable read-only memory (EEPROM), registers, hard disks, mobile hard disks, CD-ROMs, or any other form of storage medium known in the art. An exemplary storage medium is coupled to the processor so that the processor can read information from the storage medium and write information to the storage medium. Of course, the storage medium can also be an integral part of the processor. The processor and storage medium can be located in an ASIC. In addition, the ASIC can be located in a network device or a terminal device. Of course, the processor and storage medium can also be present in the terminal device as discrete components.

[0263] In the above embodiments, all or part of the embodiments can be implemented by software, hardware, firmware or any combination thereof. When implemented using software, all or part of the embodiments can be implemented in the form of a computer program product. The computer program product includes one or more computer programs or instructions. When the computer program or instructions are loaded and executed on a computer, the process or function described in the embodiments of the present application is performed in whole or in part. The computer can be a general-purpose computer, a special-purpose computer, a computer network, a network device, a user device or other programmable device. The computer program or instruction can be stored in a computer-readable storage medium or transmitted from one computer-readable storage medium to another computer-readable storage medium. For example, the computer program or instruction can be transmitted from one website, computer, server or data center to another website, computer, server or data center via wired or wireless means. The computer-readable storage medium can be any available medium that can be accessed by a computer or a data storage device such as a server or data center that integrates one or more available media. The available medium can be a magnetic medium, such as a floppy disk, a hard disk, or a tape; it can also be an optical medium, such as a digital video disc (DVD); it can also be a semiconductor medium, such as a solid state drive (SSD).

[0264] In the various embodiments of the present 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 inherent logical relationships.

[0265] 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 can 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; in the formulas of this application, the character " / " indicates that the previous and next associated objects are in a "division" relationship.

[0266] It is understood that the various numbers used in the embodiments of this application are merely for ease of description and are not intended to limit the scope of the embodiments of this application. The order of the sequence numbers of the above-mentioned processes does not necessarily imply a specific order of execution; the order of execution of the processes should be determined by their functions and inherent logic.

Claims

1. A communication method, characterized in that: The method includes: A first terminal device sends first information to a second terminal device on a first frequency band, the first information being used to instruct the second terminal device to switch from the first frequency band to a second frequency band, the bandwidth of the first frequency band being smaller than the bandwidth of the second frequency band, the first information including an amount of data required to be transmitted by the first terminal device; wherein the amount of data required to be transmitted by the first terminal device is greater than a first preset value; The first terminal device sends data to the second terminal device on the second frequency band, wherein the second frequency band is a frequency band switched by the second terminal device by default.

2. The method according to claim 1, wherein The first information also includes the first preset value.

3. The method according to claim 1, wherein The first information indicates the time domain information of the first resource and the frequency domain information of the first resource. The first resource is used by the first terminal device to send the data to the second terminal device. The frequency domain information indicates the second frequency band. The time domain information is determined based on the frequency band switching delay of the second terminal device.

4. The method according to any one of claims 1 to 3, wherein Also includes: The first terminal device receives second information from the second terminal device, where the second information indicates the first frequency band; Or the first frequency band is a preconfigured frequency band; or the first frequency band is configured by the network device for the second terminal device.

5. The method according to any one of claims 1 to 3, wherein Also includes: The first terminal device receives third information from the second terminal device, where the third information indicates a frequency band switching delay of the second terminal device.

6. The method according to claim 5, wherein The first terminal device sending data to the second terminal device on the second frequency band includes: The first terminal device sends the data to the second terminal device on the second frequency band after the frequency band switching delay; Alternatively, the first terminal device sends the data to the second terminal device on the second frequency band after the frequency band switching delay and the remaining time, and the remaining time is the remaining usage time corresponding to the first frequency band.

7. The method according to any one of claims 3 and 6, wherein: The first terminal device sends first information to the second terminal device on the first frequency band, including: If the first terminal device determines that the amount of data required to be transmitted by the first terminal device is greater than a first preset value, the first terminal device sends the first information to the second terminal device on the first frequency band.

8. The method according to any one of claims 1, 2, 3 and 6, wherein: The first information includes the identifier of the second frequency band, the frequency band adjustment amplitude, the starting frequency domain position of the second frequency band, the ending frequency domain position of the second frequency band, the starting subchannel identifier of the second frequency band, the ending subchannel identifier of the second frequency band, and at least one of the number of physical resource blocks PRBs or the number of subchannels corresponding to the second frequency band.

9. The method according to any one of claims 1, 2, 3 and 6, wherein: The first frequency band is a preset resource pool, and the preset resource pool includes some sub-channels among the multiple sub-channels; or, the first frequency band includes one or more sub-channels; The bandwidth of the first frequency band is smaller than the bandwidth of the second frequency band.

10. A communication method, characterized in that: The method includes: The second terminal device receives first information from the first terminal device on a first frequency band, where the first information is used to instruct the second terminal device to switch from the first frequency band to a second frequency band, where the bandwidth of the first frequency band is smaller than the bandwidth of the second frequency band, and the first information includes an amount of data that the first terminal device needs to transmit; The second terminal device receives data from the first terminal device on the second frequency band, wherein the second terminal device determines that the amount of data required to be transmitted by the first terminal device is greater than a first preset value, and then switches from the first frequency band to the second frequency band, wherein the second frequency band is the default frequency band to which the second terminal device switches.

11. The method according to claim 10, wherein The first information also includes the first preset value.

12. The method according to claim 10 or 11, wherein: Also includes: After the second terminal device receives the data from the first terminal device on the second frequency band, the second terminal device switches from the second frequency band to the first frequency band.

13. A communication device, characterized in that: The method comprises a processor and an interface circuit, wherein the interface circuit is used to receive signals from other communication devices outside the communication device and transmit them to the processor or send signals from the processor to other communication devices outside the communication device, and the processor is used to implement the method according to any one of claims 1 to 12 through a logic circuit or executing code instructions.

14. A computer-readable storage medium, characterized in that The storage medium stores a computer program or instruction. When the computer program or instruction is executed by the communication device, the method according to any one of claims 1 to 12 is implemented.

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