WO2024032231A1 - 资源预留方法、装置及存储介质 - Google Patents

资源预留方法、装置及存储介质 Download PDF

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Publication number
WO2024032231A1
WO2024032231A1 PCT/CN2023/104302 CN2023104302W WO2024032231A1 WO 2024032231 A1 WO2024032231 A1 WO 2024032231A1 CN 2023104302 W CN2023104302 W CN 2023104302W WO 2024032231 A1 WO2024032231 A1 WO 2024032231A1
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time
terminal device
frequency resource
resource
channel
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PCT/CN2023/104302
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English (en)
French (fr)
Inventor
张懿
苏宏家
卢磊
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华为技术有限公司
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Publication of WO2024032231A1 publication Critical patent/WO2024032231A1/zh

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W28/00—Network traffic management; Network resource management
    • H04W28/16—Central resource management; Negotiation of resources or communication parameters, e.g. negotiating bandwidth or QoS [Quality of Service]
    • H04W28/26—Resource reservation

Definitions

  • the present application relates to the field of communication technology, and in particular to resource reservation methods, devices and storage media.
  • frequency bands can be divided into authorized frequency bands and unlicensed frequency bands according to the different frequency bands used.
  • terminal devices need to use spectrum resources in a competitive manner. Specifically, the terminal device needs to compete for the channel through listen before talk (LBT). For example, the terminal device needs to listen to whether the channel is idle before accessing the channel and starting to send data. If the channel has been idle for a certain period of time, it can occupy the channel. If the channel is not idle, it needs to wait until the channel becomes idle again. occupy the channel.
  • LBT listen before talk
  • terminal devices can communicate with each other through the PC5 interface.
  • the transmission link in the PC5 interface is defined as a sidelink (SL).
  • SL sidelink
  • Communication between terminal devices using the PC5 interface can also be called for SL communication.
  • Mode 1 can also be called the user-selected resource mode.
  • Mode 2 can also be called the user-selected resource mode.
  • the time-frequency resources used by the terminal device do not depend on the base station, but need to reserve time from the resource selection window based on the results of its own listening in the listening window. frequency resources for communication.
  • the terminal device selects time-frequency resources to send data. For example, if the terminal device fails to perform LBT, the time-frequency resources reserved by the terminal device will not be available. At this time, other terminal devices have also excluded the reserved resources, resulting in a waste of resources.
  • Embodiments of this application provide resource reservation methods, devices and storage media to solve the problem that in unlicensed frequency bands, the reserved time-frequency resources cannot be used after terminal equipment using mode 2 fails to perform LBT on the reserved time-frequency resources. , causing the problem of resource waste.
  • a resource reservation method, device and storage medium are provided.
  • the method can be executed by a first terminal device or by a component of the first terminal device (such as a processor, a chip, or a chip system, etc.) , and can also be implemented by a logic module or software that can realize all or part of the functions of the first terminal device.
  • the method is described below by taking the first terminal device to execute the method as an example.
  • the method includes: the first terminal device receives first indication information from the second terminal device, the first indication information is used to indicate the first time-frequency resource.
  • a time-frequency resource is a resource reserved by the second terminal device; the first terminal device determines whether to reserve the first time-frequency resource based on one or more of the following: the first reference signal receiving power and the first time-frequency resource that has been reserved. the number of terminal devices; the first reference signal received power is the reference signal received power of the physical sidelink control channel or physical sidelink shared channel corresponding to the first indication information.
  • a terminal device when reserving resources, can determine whether to reserve resources repeatedly based on the first reference signal received power and/or the number of terminal devices that have reserved the first time-frequency resource.
  • the first time-frequency resource so that in the scenario of resource selection through mode2, the utilization rate of time-frequency resources in the system can be improved as a whole, and the situation where the terminal equipment cannot use the reserved time-frequency resources can be reduced because other terminal equipment Nor can resources be wasted by using reserved time-frequency resources.
  • the first terminal device determines whether to reserve the first time-frequency resource according to the first reference signal received power, including: the first terminal device determines whether to reserve the first time-frequency resource when the first reference signal received power is lower than In the case of the first power threshold, determine to reserve the first time-frequency resource; or, in the case where the first reference signal received power is lower than the second power threshold and higher than the third power threshold, the first terminal device determines to reserve The first time-frequency resource.
  • the first terminal device can receive power according to the first reference signal and the first power threshold and the second power threshold. and/or the third power threshold to determine whether to reserve the first time-frequency resource.
  • the first power threshold, the second power threshold or the third power threshold is based on one of the channel busy ratio, the channel occupancy ratio and the number of times the channel is detected as busy. or multiple pieces of information. Based on this solution, multiple methods for determining the first power threshold, the second power threshold or the third power threshold are provided.
  • the first terminal device determines whether to reserve the first time-frequency resource based on the number of terminal devices that have reserved the first time-frequency resource, including: the first terminal device has already reserved the first time-frequency resource. When the number of terminal devices that reserve the first time-frequency resource is lower than the first threshold, it is determined to reserve the first time-frequency resource.
  • the first terminal device can reserve the first time-frequency resource according to the number of terminal devices that have reserved the first time-frequency resource.
  • the first terminal device can reserve the first time-frequency resource.
  • One time-frequency resource prevents the first terminal device from being unable to access the time-frequency resource to send data due to multiple terminal devices reserving the same time-frequency resource.
  • the first threshold is determined based on one or more information from the channel busy ratio, the channel occupancy ratio and the number of times the channel is detected as busy. Based on this solution, multiple methods for determining the first threshold are provided.
  • the first time-frequency resource is within the resource selection window.
  • the starting time domain position of the resource selection window is determined based on the first LBT completion time point; wherein the first LBT completion time point is determined based on the value of the LBT counter .
  • the starting time domain position of the resource selection window can be determined based on the LBT completion time point, ensuring that the time and frequency resources in the resource selection window are all after the LBT completion time point, and the time and frequency resources will not be unable to access because the LBT is not completed. resource.
  • the method further includes: the first terminal device determines whether to perform resource reselection based on the first LBT completion time point; wherein the first LBT completion time point is based on the LBT counter The value is determined.
  • the first terminal device determines whether to perform resource reselection according to the first LBT completion time point, including: when the starting time domain position of the first time-frequency resource is in the first Before the LBT completion time point, the first terminal device determines to perform resource reselection and selects the second time-frequency resource, and the starting time domain position of the second time-frequency resource is after the first LBT completion time point; or, in the third When the starting time domain position of a time-frequency resource is after the first LBT completion time point, the first terminal device determines not to perform resource reselection.
  • resource reselection can be performed when the starting time domain position of the first time-frequency resource is before the LBT completion time point, and the second time-frequency resource can be reselected with the starting time domain position after the LBT completion time point. , to avoid being unable to access the first time-frequency resource to send data due to incomplete LBT.
  • the first terminal device selects the second time-frequency resource, including: the first terminal device selects the second time-frequency resource according to one or more of the following: second reference signal reception power and the number of terminal devices that have reserved the second time-frequency resource; the second reference signal received power is the reference signal received power of the physical sidelink control channel or physical sidelink shared channel corresponding to the second indication information. Based on this solution, multiple ways of selecting second time-frequency resources are provided.
  • the values of the LBT counters in the first terminal device and the second terminal device decrease to 0, and the priority of the service data of the first terminal device is higher than that of the second terminal device.
  • the method further includes: the first terminal device sends the service data on the first time-frequency resource.
  • the first indication information is carried in the first-level sidelink control information, the second-level sidelink control information, and the sidelink media access control control element. Or at least one piece of information in PC5 radio resource control signaling. Based on this solution, a variety of information that can carry the first indication information is provided.
  • a resource reservation method, device and storage medium are provided.
  • the method can be executed by the first terminal device or by components of the first terminal device (such as a processor, a chip, or a chip system, etc.) , and can also be implemented by a logic module or software that can realize all or part of the functions of the first terminal device.
  • the method is described below by taking the first terminal device executing this method as an example.
  • the method includes: the first terminal device determines the first LBT completion time point according to the value of the LBT counter N.
  • the first terminal device reserves the first time-frequency resource in the resource selection window and/or determines whether to perform resource reselection according to the first LBT completion time point.
  • the terminal device can reserve time-frequency resources according to the LBT completion time point to avoid being unable to use the reserved time-frequency resources because the LBT is not completed.
  • the terminal device can determine whether to perform resource reselection based on the LBT completion time point. This can be used when the reserved time-frequency resources cannot be used because the LBT is not completed.
  • the reselected resource sends data.
  • the first terminal device reserves the first time-frequency resource in the resource selection window according to the first LBT completion time point, including: the first terminal device reserves the first time-frequency resource in the resource selection window. Reserve the first time-frequency resource whose starting time domain position is after the first LBT completion time point. Based on this solution, when reserving resources, the first time-frequency resource whose starting time domain position is after the LBT completion time point can be reserved to avoid being unable to use the first time-frequency resource to send data because the LBT is not completed.
  • the first terminal device determines whether to perform resource reselection according to the LBT completion time point, including: the starting time domain position of the first time-frequency resource is at the LBT completion time point.
  • the first terminal device determines to perform resource reselection and selects the second time-frequency resource; the starting time domain position of the second time-frequency resource is after the first LBT completion time point.
  • resource reselection can be performed when the starting time domain position of the first time-frequency resource is before the LBT completion time point, and the second time-frequency resource can be reselected with the starting time domain position after the LBT completion time point.
  • the second time-frequency resource can be used to send data when the first time-frequency resource cannot be used because the LBT is not completed.
  • the first terminal device selects the second time-frequency resource according to one or more of the following: the second reference signal receiving power and the terminal device that has reserved the second time-frequency resource.
  • the number; wherein the second reference signal received power is the reference signal received power of the physical sidelink control channel or physical sidelink shared channel corresponding to the second indication information.
  • the first terminal device selects the second time-frequency resource, including: when the number of terminal devices that have reserved the second time-frequency resource is lower than the first threshold, The first terminal device selects the second time-frequency resource. Based on this solution, the first terminal device can select the second time-frequency resource when the number of terminal devices that have reserved the second time-frequency resource is lower than the first threshold to avoid repeatedly reserving the second time-frequency resource due to too many terminal devices. frequency resources, causing the first terminal device to be unable to access the second time-frequency resources to send data.
  • the first threshold is determined based on one or more information from the channel busy ratio, the channel occupancy ratio and the number of times the channel is detected as busy. Based on this solution, multiple methods for determining the first threshold are provided.
  • the first terminal device selects the second time-frequency resource, including: when the second time-frequency resource is reserved by the second terminal device, and the second reference signal received power is lower than In the case of the first power threshold, or in the case where the second time-frequency resource is reserved by the second terminal device and the second reference signal received power is lower than the second power threshold and higher than the third power threshold, the first terminal The device selects the second time frequency resource. Based on this solution, the first terminal device can determine whether to select the second time-frequency resource based on the relationship between the received power of the second reference signal and the first power threshold, the second power threshold, and/or the third power threshold.
  • the first power threshold, the second power threshold or the third power threshold is based on one of the channel busy ratio, the channel occupancy ratio and the number of times the channel is detected as busy. or multiple pieces of information. Based on this solution, multiple methods for determining the first power threshold, the second power threshold or the third power threshold are provided.
  • the first terminal device selects the second time-frequency resource, including: when the second time-frequency resource is reserved by the second terminal device, and the second reference signal received power is lower than In the case of the second threshold, the first terminal device selects the second time-frequency resource. Based on this solution, the first terminal device can determine whether to select the second time-frequency resource based on the relationship between the second reference signal received power and the second threshold.
  • the second threshold is determined based on the priority indicated by the second indication information and the priority of the data to be sent by the first terminal device; wherein the second indication information is used to Indicates the second time-frequency resource. Based on this solution, a method for determining the second threshold is provided.
  • a communication device for implementing the various methods mentioned above.
  • the communication device may be the first terminal device in the above-mentioned first aspect or the second aspect, or a device including the above-mentioned first terminal device, or a device included in the above-mentioned first terminal device, such as a chip.
  • the communication device includes corresponding modules, units, or means (means) for implementing the above method.
  • the modules, units, or means can be implemented by hardware, software, or by hardware executing corresponding software.
  • the hardware or software includes one or more modules or units corresponding to the above functions.
  • a fourth aspect provides a communication device, including: a processor, the processor is configured to execute instructions stored in a memory, and when the processor executes the instructions, the communication device performs the method described in any of the above aspects.
  • the communication device may be the above The first terminal device in the first aspect or the second aspect, or a device including the above-mentioned first terminal device, or a device included in the above-mentioned first terminal device, such as a chip.
  • the communication device further includes a memory, which is used to store computer instructions.
  • the processor and the memory are integrated together, or the processor and the memory are provided separately.
  • the memory is coupled to the processor and is external to the communication device.
  • a communication device including: a processor and an interface circuit, the interface circuit is used to communicate with a module outside the communication device; the processor is used to execute through a logic circuit, or by running a computer program or instructions The method described in any of the above aspects.
  • the communication device may be the first terminal device in the above-mentioned first aspect or the second aspect, or a device including the above-mentioned first terminal device, or a device included in the above-mentioned first terminal device, such as a chip.
  • the interface circuit can be a code/data read-write interface circuit, which is used to receive computer execution instructions (computer execution instructions are stored in the memory, may be read directly from the memory, or may pass through other devices) and transmitted to the A processor, such that the processor executes computer execution instructions to perform the method described in any of the above aspects.
  • the communication device may be a chip or a system on a chip.
  • a computer-readable storage medium is provided. Instructions are stored in the computer-readable storage medium, and when run on a communication device, the communication device can perform the method described in any of the above aspects.
  • the communication device may be the first terminal device in the above-mentioned first aspect or the second aspect, or a device including the above-mentioned first terminal device, or a device included in the above-mentioned first terminal device, such as a chip.
  • a seventh aspect provides a computer program product containing instructions that, when run on a communication device, enables the communication device to perform the method described in any of the above aspects.
  • the communication device may be the first terminal device in the above-mentioned first aspect or the second aspect, or a device including the above-mentioned first terminal device, or a device included in the above-mentioned first terminal device, such as a chip.
  • An eighth aspect provides a communication device (for example, the communication device may be a chip or a chip system).
  • the communication device includes a processor for implementing the functions involved in any of the above aspects.
  • the communication device further includes a memory, which is used to store necessary program instructions and data.
  • the communication device is a chip system, it may be composed of a chip, or may include a chip and other discrete devices.
  • FIG. 1 is a schematic diagram of an LBT provided by an embodiment of the present application.
  • Figure 2 is a schematic diagram of an interleaved resource provided by an embodiment of the present application.
  • Figure 3 is a schematic diagram of another interleaved resource provided by an embodiment of the present application.
  • Figure 4 is a schematic diagram of resource selection provided by an embodiment of the present application.
  • Figure 5 is an architectural schematic diagram of a communication system provided by an embodiment of the present application.
  • Figure 6 is a schematic structural diagram of a communication device provided by an embodiment of the present application.
  • Figure 7 is an interactive schematic diagram of a resource reservation method provided by an embodiment of the present application.
  • Figure 8 is a schematic diagram of a resource selection window provided by an embodiment of the present application.
  • Figure 9 is a schematic flowchart of a resource reservation method provided by an embodiment of the present application.
  • Figure 10 is a schematic diagram of reselecting a second time-frequency resource according to an embodiment of the present application.
  • Figure 11 is a schematic diagram of another reselection of second time-frequency resources provided by an embodiment of the present application.
  • Figure 12 is a schematic diagram of reserved resources provided by an embodiment of the present application.
  • Figure 13 is a schematic diagram of reserving multiple time-frequency resources according to an embodiment of the present application.
  • Figure 14 is another schematic diagram of reserving multiple time-frequency resources according to an embodiment of the present application.
  • Figure 15 is a schematic structural diagram of a communication device provided by an embodiment of the present application.
  • Figure 16 is a schematic structural diagram of another communication device provided by an embodiment of the present application.
  • frequency bands can be divided into authorized frequency bands and unlicensed frequency bands according to the different frequency bands used.
  • equipment network equipment or terminal equipment
  • listen-before-talk LBT the device needs to listen to whether the channel is idle before accessing the channel and starting to send data. If the channel has been idle for a certain period of time, it can occupy the channel. If the channel is not idle, it needs to wait until the channel becomes idle again. occupy the channel.
  • NR new radio
  • Type 1 LBT The device requires random backoff to access the channel and send data.
  • Type 1 LBT includes the following steps. After the device listens to the channel for the first time and becomes idle within a period of extended duration (defer duration) (recorded as T d ), it can initiate transmission after the counter N in the following steps reaches zero. The adjustment of the counter is determined based on the listening result of the device during the listening time slot period, that is, T sl in the following steps.
  • Step 3 Listen to the channel to obtain the additional listening time slot period T sl . If the channel for the additional listening time slot period is idle, go to step 4; otherwise, go to step 5.
  • Step 5 Listen to the channel until the channel is heard to be busy within another T d or until all listening slots within another T d are detected as channel idle.
  • Step 6 If the listening time slots in another T d are all detected as channel idle, proceed to step 4; otherwise, proceed to step 5.
  • the counter N used in the LBT process in the above steps 1 to 6 can be called an LBT counter.
  • T f includes an idle period at the beginning.
  • m p , CW min,p and CW max,p are determined based on the channel access priority level p associated with the data transmission of the device. Specifically, the device maintenance p and m p , The mapping relationship between CW min,p and CW max,p is used to determine m p , CW min,p and CW max,p according to the p configured by the higher layer, and LBT is performed.
  • Figure 1 is a schematic diagram of a possible situation in which the device performs Type 1 LBT and listens to the channel until it accesses the channel.
  • the device detects that the channel is idle in the first T d , and the device continues to listen to the channel in the first T sl .
  • COT channel occupancy time
  • Type 2A LBT The device can access the channel and send data after sensing that the channel has been idle for 25 ⁇ s.
  • Type 2B LBT The device can access the channel and send data after sensing that the channel has been idle for 16 ⁇ s.
  • Type 2C LBT The device does not need to listen to the channel. It can directly access the channel and send data after a conversion interval of up to 16 ⁇ s in the COT. Among them, COT refers to the time the device is allowed to occupy the channel after successfully accessing the channel. Specifically, if the device has accessed the channel and sent data, and if the interval between the previous data transmission and the next data transmission is less than 16 ⁇ s, the device does not need to listen to the channel after the previous data transmission and can transmit immediately during the next data transmission.
  • the NR system introduces The concept of interlaced resource block (interlaced RB) is introduced, and the interlaced resource m (also called the resource on interlaced m) is defined to include ⁇ m, M+m, 2M+m, 3M+m,... ⁇ RB, where m ⁇ 0,1,...,M-1 ⁇ .
  • interlaced RB interlaced resource block
  • m also called the resource on interlaced m
  • device 1 can use the resources on interlace 0 (interlace 0), including ⁇ RB0, RB10, ..., RB90 ⁇
  • device 2 can use the resources on interlace 1 (interlace 1), including ⁇ RB1, RB11, ..., RB91 ⁇ , and the rest of the devices use interlace resources and so on.
  • SCS subcarrier spacing
  • interlace and sub-channel can be used interchangeably.
  • both 3a and 3b in Figure 3 can be used to indicate that the device uses 4 interleaved resources (sub-channels).
  • 3a means that the device uses 1 interleaved resource in each of the 4 channels;
  • 3b means that the device uses 4 interleaved resources in 1 channel.
  • the device does not send data over the entire bandwidth occupied by the channel. Instead, it reserves a part of the frequency domain resources as a guard band, and uses the remaining Frequency domain resources are used to transmit data, and the available resources for transmitting data may be called a resource block set (RB set).
  • RB set resource block set
  • channels and RB sets can be used interchangeably.
  • terminal devices can communicate with each other through the PC5 interface.
  • the transmission link in the PC5 interface is defined as SL. Therefore, communication between terminal devices using the PC5 interface can also be called SL communication.
  • mode 1 the base station allocates time-frequency resources to terminal equipment.
  • Mode 2 can be called the user-selected resource mode.
  • the terminal device does not rely on the base station to use time-frequency resources. Instead, it needs to select resources from the resource selection window and perform operations based on its own listening results in the listening window. Reserved (reserved), or reserved time and frequency resources, thereby selecting the reserved time and frequency resources for SL communication and data transmission.
  • the terminal device Before selecting a resource, the terminal device needs to obtain the SL resource pool configuration information, and the SL resource pool configuration information can indicate the SL resource pool.
  • the SL resource pool is a collection of time-frequency resources, where the time-frequency resources can be used for SL communication between terminal devices.
  • the specific resource selection process includes the following steps:
  • Step 1 Determine the resource selection window [n+T 1 , n+T 2 ].
  • T 1 is implemented by the user and satisfies It is determined based on relevant configuration information.
  • the high-level parameter configuration of the terminal device is T 2min . If T 2min is less than the remaining packet delay budget (PDB), then T 2 satisfies T 2min ⁇ T 2 ⁇ remaining PDB; otherwise, T 2 is equal to the remaining PDB.
  • the time domain resources of the resource selection window are within the time domain resources of the SL resource pool, and the frequency domain resources of the resource selection window are the same as the frequency domain resources of the SL resource pool.
  • Step 2 Determine the listening window Among them, T 0 and It is determined based on relevant configuration information.
  • Step 3 Determine the reference signal received power (RSRP) threshold, the RSRP threshold, the priority prio TX of the data to be sent, and the received sidelink control information (SCI)
  • RSRP reference signal received power
  • SCI received sidelink control information
  • Step 4 Initialize the resource set S A to include all time-frequency resources in the resource selection window, where the time-frequency resources in the resource selection window are in units of one time slot in the time domain and in the unit of L subCH continuous sub-channels in the frequency domain. .
  • Step 5 Exclude the following time-frequency resources from S A : time-frequency resources in the resource selection window corresponding to the unlistened time slots in the listening window.
  • Step 5a If in step 5, the time-frequency resources excluded from S A are less than X% of the total resources included in the resource selection window, re-execute step 4 to initialize S A. Among them, the value of X is configured by the SL resource pool configuration information.
  • Step 6 Continue to exclude the following time-frequency resources from S A : the received first-level SCI is successfully decoded, the time-frequency resources reserved for the received first-level SCI are within the resource selection window, and the received first-level SCI is decoded successfully.
  • RSRP measurement of the demodulation reference signal (DMRS) of the physical sidelink shared channel (PSSCH) or physical sidelink control channel (PSCCH) corresponding to the level SCI The result is higher than the corresponding RSRP threshold determined in step 3.
  • DMRS demodulation reference signal
  • PSSCH physical sidelink shared channel
  • PSCCH physical sidelink control channel
  • the terminal device 1 can determine the terminal according to the first-level SCI.
  • Device 2 has reserved time-frequency resource 1, and determined the RSRP threshold corresponding to time-frequency resource 1 based on its own prio TX of data to be sent and the priority prio RX indicated by the first-level SCI.
  • Terminal equipment 1 performs RSRP measurement on the DMRS of PSSCH of time-frequency resource 1. If If the RSRP measurement result is higher than the RSRP threshold corresponding to time-frequency resource 1, the terminal device excludes time-frequency resource 1 from S A.
  • Step 7 If the number of remaining candidate resources in S A is less than X% of the total resources included in the resource selection window, increase the RSRP threshold determined in step 3 (3dB each time) and perform the resource initialization process in step 4 . At this time, the remaining candidate resources in S A can be called available resources within the resource selection window.
  • the terminal device reports S A to the medium access control element (MAC) layer.
  • the MAC layer randomly selects time-frequency resources in SA for sending data.
  • the terminal device will send the first-level SCI to other terminal devices, indicating the time-frequency domain location of the selected time-frequency resource, so that other terminal devices can determine that the time-frequency resource has been reserved.
  • the first-level SCI sent by the terminal device indicates The time-frequency resources can also be called the time-frequency resources reserved by the terminal device.
  • FIG. 4 is a schematic diagram of a possible situation in which the terminal device excludes time-frequency resources in the resource selection window based on the listening results in the listening window.
  • the terminal device receives two different first-level SCIs on time-frequency resources 1 and 3 within the listening window. Among them, the first-level SCI received on time-frequency resource 1 indicates the time. Frequency resource 2, time-frequency resource 5 and time-frequency resource 6.
  • the first-level SCI received on time-frequency resource 3 indicates time-frequency resource 4, time-frequency resource 7 and time-frequency resource 8.
  • the terminal device triggers resource selection in time slot n. Based on these two first-level SCIs, the terminal device determines that time-frequency resource 2 and time-frequency resource 4 are not within the resource selection window.
  • Time-frequency resource 5, time-frequency resource 6, and time-frequency resource 7 and time-frequency resource 8 are within the resource selection window and have been reserved by other terminal devices.
  • the terminal device determines the RSRP gates corresponding to time-frequency resource 5, time-frequency resource 6, time-frequency resource 7 and time-frequency resource 8 respectively according to the prio TX of the data to be sent and the priorities indicated by the two first-level SCIs respectively. limit, the terminal equipment separately measures the DMRS of the PSSCH corresponding to the two first-level SCIs received, and the obtained RSRPs are all higher than the corresponding RSRP threshold, then the terminal equipment excludes the time-frequency resources 5 within the resource selection window. , time-frequency resource 6, time-frequency resource 7 and time-frequency resource 8.
  • the terminal device can re-evaluate the selected time-frequency resource pair before sending data through the selected time-frequency resource. If the time-frequency resource is excluded in the re-evaluation, the terminal device can reselect the time-frequency resource. Specifically, the terminal device executes steps 1 to 7 in the above resource selection process again to determine whether the selected time-frequency resources will be excluded. If the selected time-frequency resources are excluded in the re-executed process, the terminal device needs to re- Select time and frequency resources. Assuming that the time slot where the selected time-frequency resource is located is m, the terminal device can trigger resource re-evaluation before and after time slot m-T3, where, It is determined based on the SL part bandwidth (BWP) configuration information.
  • BWP SL part bandwidth
  • terminal devices can select and reserve resources using dynamic scheduling or semi-persistent scheduling (SPS).
  • SPS semi-persistent scheduling
  • the dynamic scheduling method can select resources for a single transport block (TB) and reserve resources for retransmission of the same TB.
  • the SPS method can select resources for multiple TBs and reserve resources for retransmissions of multiple TBs.
  • reserved resources can be periodic or non-periodic. In the case where the reserved resources are periodic, the reserved resources in different periods are used to transmit different TBs. When the reserved resources are aperiodic, the reserved resources are used to transmit the same TB, which can be understood as reserving resources for retransmission of the same TB.
  • the device can access the channel through the Type 1 or Type 2 type LBT introduced above to achieve multi-channel access.
  • Different types of multi-channel access procedures are introduced below.
  • the device can perform the channel access process on each channel c i ⁇ C based on the Type 1 LBT process, where C is the set of channels that the device prepares for transmission.
  • Type A1 multi-channel access process The counter of each channel c i is determined independently, recorded as When a device accesses channel c j ⁇ C, the device stops listening to other channels in C. When the device stops transmitting on channel c j , for other channels c i ⁇ c j , after waiting for 4*T sl , the device can continue to decrement if the listening channel is idle within T d . Alternatively, the device can be reinitialized
  • TypeA2 multi-channel access process the counter of channel c j ⁇ C is recorded as where c j is the channel configured with the maximum CW p value. For other channels c i satisfies That is, the initial value of the counter for each channel is unified.
  • the device accesses channel c j ⁇ C, the device stops listening to other channels in C.
  • the device stops transmitting on any channel c i ⁇ C, the device reinitializes the counters for all channels
  • Channel c j access The device can access channel c j based on the existing Type 1 LBT process.
  • Type B1 multi-channel access process maintain a CW p for channel set C.
  • Each channel c i ⁇ C is independently configured with a CW p value.
  • the counter N init of channel c j is determined by the CW p value of channel c j1 ⁇ C, where c j1 is the channel with the largest CW p value in channel set C.
  • the device needs to perform LBT to access the channel to transmit data.
  • the terminal device uses mode 2
  • the terminal device needs to reserve time-frequency resources in the resource selection window. way to select time-frequency resources to transmit data.
  • the terminal equipment mode 2 performs SL communication in the unlicensed frequency band
  • At least one of the following or similar expressions thereof refers to any combination of these items, including any combination of a single item (items) or a plurality of items (items).
  • at least one of a, b, or c can mean: a, b, c, a-b, a-c, b-c, or a-b-c, where a, b, c can be single or multiple .
  • words such as “first” and “second” are used to distinguish identical or similar items with basically the same functions and effects.
  • words such as “first” and “second” do not limit the number and execution order, and words such as “first” and “second” do not limit the number and execution order.
  • words such as “exemplary” or “for example” are used to represent examples, illustrations or explanations. Any embodiment or design described as “exemplary” or “such as” in the embodiments of the present application is not to be construed as preferred or advantageous over other embodiments or designs. Rather, the use of words such as “exemplary” or “such as” is intended to present related concepts in a concrete manner that is easier to understand.
  • the resource reservation method provided by the embodiment of the present application can be applied to various communication systems.
  • the resource reservation method provided by the embodiments of this application can be applied to long term evolution (LTE) systems, or 5G systems, or systems in which terminal devices can communicate directly, such as device-to-device (device-to-device).
  • LTE long term evolution
  • 5G 5G systems
  • terminal devices can communicate directly, such as device-to-device (device-to-device).
  • device, D2D) or vehicle-to-everything (V2X) systems or other similar new communication systems facing the future, such as the sixth-generation (6G) system
  • 6G sixth-generation
  • the communication system 30 includes a plurality of terminal devices 40 . Among them, different terminal devices 40 can communicate with each other.
  • the terminal device 40 may be fixed-positioned or movable.
  • FIG. 5 is only a schematic diagram, and the embodiment of the present application does not limit the communication system 30 to include three terminal devices 40 .
  • the communication system 30 may also include other devices.
  • the communication system 30 may also include a network device.
  • the terminal device 40 may be within the coverage of the network device or may be within the coverage of the network device. Except, there are no specific limitations here.
  • the network device in the embodiment of this application is a device that connects a terminal device to a wireless network.
  • the network equipment in the embodiment of the present application may include various forms of base stations (base stations), for example, they may be macro base stations, micro base stations (also (called small station), relay station, access point, transmitting point (TP), evolved base station (evolved NodeB, eNodeB), transmission reception point (TRP), the next generation in the 5G mobile communication system
  • Base stations nodeB, gNB
  • V2X vehicle outreach
  • M2M machine-to-machine
  • M2M machine-to-machine
  • the module or unit may be, for example,
  • network equipment refers to wireless access network equipment.
  • the terminal device in the embodiment of the present application may be a device with a wireless transceiver function, and may also be called a terminal.
  • Terminal equipment can specifically refer to user equipment (user equipment, UE), access terminal, subscriber unit (subscriber unit), user station, mobile station (mobile station), customer terminal equipment (customer-premises equipment, CPE), remote station, Remote terminal, mobile device, mobile terminal, user terminal, wireless communication device, user agent or user device, etc.
  • the terminal device can also be a satellite phone, a cellular phone, a smartphone, a cordless phone, a session initiation protocol (SIP) phone, a wireless data card, a wireless modem, a tablet, a computer with wireless transceiver capabilities, or a wireless local loop (wireless local loop, WLL) station, personal digital assistant (PDA), handheld device with wireless communication capabilities, computing device or other processing device connected to a wireless modem, vehicle-mounted equipment, communication equipment carried on high-altitude aircraft , wearable devices, drones, robots, smart point of sale (POS) machines, machine type communication equipment, terminal equipment in D2D, terminal equipment in V2X, virtual reality (VR) terminal equipment , augmented reality (AR) terminal equipment, wireless terminals in industrial control, wireless terminals in self-driving, wireless terminals in remote medical, smart grid ), wireless terminals in transportation safety, wireless terminals in smart cities, wireless terminals in smart homes, or terminal equipment in future communication networks, etc.
  • the embodiments of this application do not limit the
  • the network equipment or terminal equipment in the embodiments of this application can be deployed on land, including indoors or outdoors, handheld or vehicle-mounted; it can also be deployed on water; it can also be deployed on aircraft, balloons and artificial satellites in the air.
  • the embodiments of this application do not limit the application scenarios of network devices or terminal devices.
  • the network device or terminal device in the embodiment of the present application can also be called a communication device, which can be a general device or a dedicated device, which is not specifically limited in the embodiment of the present application.
  • the relevant functions of the terminal device in the embodiment of the present application may be implemented by one device, or may be implemented by multiple devices together, or may be implemented by one or more functional modules in one device.
  • the above functions can be either network elements in hardware devices, software functions running on dedicated hardware, or a combination of hardware and software, or instantiated on a platform (for example, a cloud platform) Virtualization capabilities.
  • FIG. 6 shows a schematic structural diagram of a communication device 400 provided by an embodiment of the present application.
  • the communication device 400 includes one or more processors 401, communication lines 402, and at least one communication interface (FIG. 6 is only an example of including a communication interface 404 and a processor 401 for illustration).
  • Optional may also include memory 403.
  • the processor 401 can be a general central processing unit (CPU), a microprocessor, an application-specific integrated circuit (ASIC), or one or more processors used to control the execution of the program of the present application. integrated circuit.
  • CPU central processing unit
  • ASIC application-specific integrated circuit
  • Communication line 402 may include a path for connecting between different components.
  • the communication interface 404 may be a transceiver module used to communicate with other devices or communication networks, such as Ethernet, RAN, wireless local area networks (WLAN), etc.
  • the transceiver module may be a device such as a transceiver or a transceiver.
  • the communication interface 404 can also be a transceiver circuit located in the processor 401 to implement the processor's communication. signal input and signal output.
  • the memory 403 may be a device with a storage function. For example, it can be read-only memory (ROM) or other types of static storage devices that can store static information and instructions, random access memory (random access memory, RAM) or other types of things that can store information and instructions. Dynamic storage devices can also be electrically erasable programmable read-only memory (EEPROM), compact disc read-only memory (CD-ROM) or other optical disk storage, optical disc storage ( Including compressed optical discs, laser discs, optical discs, digital versatile discs, Blu-ray discs, etc.), magnetic disk storage media or other magnetic storage devices, or can be used to carry or store desired program code in the form of instructions or data structures and can be stored by a computer. any other medium, but not limited to this.
  • the memory may exist independently and be connected to the processor through a communication line 402 . Memory can also be integrated with the processor.
  • the memory 403 is used to store computer execution instructions for executing the solution of the present application, and is controlled by the processor 401 for execution.
  • the processor 401 is configured to execute computer execution instructions stored in the memory 403, thereby implementing the resource reservation method provided in the embodiment of the present application.
  • the processor 401 may also perform processing-related functions in the resource reservation method provided in the following embodiments of the present application, and the communication interface 404 is responsible for communicating with other devices or communication networks, The embodiments of the present application do not specifically limit this.
  • the computer-executed instructions in the embodiments of the present application may also be called application codes, which are not specifically limited in the embodiments of the present application.
  • the processor 401 may include one or more CPUs, such as CPU0 and CPU1 in FIG. 6 .
  • the communication device 400 may include multiple processors. Each of these processors can be a single-core processor or a multi-core processor.
  • the processor here may include but is not limited to at least one of the following: central processing unit (CPU), microprocessor, digital signal processor (DSP), microcontroller unit (MCU), or artificial intelligence
  • CPU central processing unit
  • DSP digital signal processor
  • MCU microcontroller unit
  • computing devices such as processors that run software.
  • Each computing device may include one or more cores for executing software instructions to perform calculations or processing.
  • the communication device 400 may also include an output device 405 and an input device 406.
  • Output device 405 communicates with processor 401 and can display information in a variety of ways.
  • the output device 405 may be a liquid crystal display (LCD), a light emitting diode (LED) display device, a cathode ray tube (CRT) display device, or a projector. wait.
  • Input device 406 communicates with processor 401 and can receive user input in a variety of ways.
  • the input device 406 may be a mouse, a keyboard, a touch screen device, a sensing device, or the like.
  • the above-mentioned communication device 400 may sometimes also be called a communication device, which may be a general-purpose device or a special-purpose device.
  • the communication device 400 can be a desktop computer, a portable computer, a network server, a personal digital assistant (PDA), a mobile phone, a tablet computer, a wireless terminal device, an embedded device, the above-mentioned terminal device, the above-mentioned network device, or a device with a diagram. 4 devices with similar structures.
  • the embodiment of the present application does not limit the type of communication device 400.
  • a resource reservation method is provided in an embodiment of the present application.
  • a terminal device is used as the execution subject of the interactive gesture as an example to illustrate this method, but this application does not limit the execution subject of the interactive gesture.
  • the terminal device in Figure 7 may also be a chip, chip system, or processor that supports the terminal device to implement the method, or may be a logic module or software that can realize all or part of the application function network element functions.
  • the resource reservation methods include S501-S502:
  • the first terminal device receives first indication information from the second terminal device.
  • the first indication information is used to indicate a first time-frequency resource, and the first time-frequency resource is a resource reserved by the second terminal device.
  • the first terminal device determines whether to reserve the first time-frequency resource based on one or more of the following: the first reference signal receiving power and the number of terminal devices that have reserved the first time-frequency resource.
  • the resource reservation method provided by the embodiment of this application can be applied in the scenario where the terminal device uses mode 2 for SL communication.
  • the terminal device if the terminal device is at the starting time domain position of the time-frequency resource that has been reserved by the terminal device, the terminal device If the LBT performed on the channel corresponding to the resource has not been completed (the value of the LBT counter N has not yet equaled 0), it can be called an LBT failure.
  • the LBT performed by the terminal device on the channel corresponding to the time-frequency resource has been completed (the value of the LBT counter N is already equal to 0) before the starting time domain position of the time-frequency resource that the terminal device has reserved, then it can be called LBT successful.
  • a terminal device when reserving resources, can determine whether to reserve the first reference signal based on the received power of the first reference signal and/or the number of terminal devices that have reserved the first time-frequency resource.
  • a time-frequency resource in other words, the terminal device can determine whether to repeatedly reserve the first time-frequency resource based on the conditions related to the first time-frequency resource, so that in the scenario of resource selection through mode2, the overall time-frequency in the system can be improved. Resource utilization.
  • the resource reservation method provided by the embodiment of the present application is applied in the unlicensed frequency band, it can also reduce the situation when LBT fails and the terminal device cannot use the reserved time and frequency resources because other terminal devices cannot use the reserved time and frequency resources. Waste of resources caused by remaining time and frequency resources.
  • the channel corresponding to the first time-frequency resource refers to a frequency domain resource that is the same as the first time-frequency resource, or the frequency domain resource includes a channel/sub-channel of the frequency domain resource of the first time-frequency resource.
  • This unified explanation is the same for channels corresponding to other time-frequency resources.
  • the first terminal device after the first terminal device triggers resource selection, it can determine the listening window and the resource selection window, and thereby select the time-frequency resources to be reserved in the resource selection window based on the listening results in the listening window. .
  • the first terminal device can trigger resource selection.
  • the first terminal device may determine the time domain resource corresponding to the listening window or the resource selection window based on the time domain position when the resource selection is triggered. For example, the first terminal device triggers resource selection in time slot n, and the time domain position of the listening window determined by the first terminal device can be Among them, T 0 and It can be determined based on relevant configuration information.
  • the time domain position of the resource selection window determined by the first terminal device may be [n+T 1 , n+T 2 ], where the selection of T 1 and T 2 is based on the implementation of the first terminal device.
  • the first terminal device may determine the time domain resources corresponding to the resource selection window according to the first LBT completion time point.
  • the LBT time calculated by a terminal device based on the value of the LBT-related configuration information counter N is the actual time to complete the LBT; otherwise, if the channel listened by the first terminal device is not always idle, the first terminal device calculates the LBT time based on the LBT-related configuration information counter N.
  • the LBT time calculated from the value of the configuration information counter N is not the actual time to complete the LBT.
  • the first terminal device sets the starting time domain position of the resource selection window to be the same as the first LBT completion time point or set after the first LBT completion time point.
  • the LBT-related configuration information is used for the first terminal device to perform LBT.
  • the LBT-related configuration information may include at least one of the following information: p, CW p , CW min,p and CW max,p .
  • the explanations of p, CW p , CW min,p and CW max,p can refer to the above introduction to LBT, and will not be described again here.
  • the subsequent LBT process is ideal or non-ideal.
  • the interval between the starting time domain position of the resource selection window and the first LBT completion time point may be a predetermined time. set.
  • the time slot where the starting time domain position of the resource selection window is located can be set to be the first time slot after the time slot where the first LBT completion time point is located.
  • the time slot where the first LBT completion time point is located is the time slot. 1, then the starting time domain position of the resource selection window can be the starting time domain position of time slot 2.
  • the first terminal device when the first terminal device determines the resource selection window, the first terminal device can determine the smallest value among the PDB values corresponding to the multiple different TBs.
  • the PDB value determines the time domain position of the resource selection window. Specifically, the first terminal device may determine T 2 based on the smallest PDB value among the PDB values corresponding to multiple different TBs.
  • the first terminal device can determine the frequency domain resources corresponding to the resource selection window based on the obtained SL resource pool configuration information. Specifically, the first terminal device can determine the frequency domain resource set indicated by the SL resource pool configuration information. is the frequency domain resource corresponding to the resource selection window.
  • the first terminal device After the first terminal device determines the resource selection window, it can use one or more time slots as the time domain unit of the time-frequency resource, and use one or more sub-channels as the frequency domain unit of the time-frequency resource to determine all time-frequency units in the resource selection window. frequency resources. Alternatively, the first terminal device may use one TB as a unit of time-frequency resources to determine all time-frequency resources in the resource selection window. Wherein, the first terminal device determines all time-frequency resources in the resource selection window, which can also be called the first terminal device initialization resource set (can be recorded as ⁇ A ), including all time-frequency resources in the resource selection window.
  • the first terminal device initialization resource set can be recorded as ⁇ A
  • the second terminal device can indicate the time-frequency domain of the reserved first time-frequency resource to other terminal devices through the first indication information. Location. After the first terminal device receives the first indication information sent by the second terminal device within the listening window, the first terminal device can determine the indication based on the first indication information. The first time-frequency resource indicated by the information has been reserved by the second terminal device.
  • the second terminal device is a terminal device different from the first terminal device.
  • the number of second terminal devices may be one or more.
  • the number of first indication information may also be one or more.
  • the first indication information may directly indicate the time-frequency domain location of the first time-frequency resource.
  • the first indication information may indicate the starting time-domain location and the ending time-domain location of the first time-frequency resource, and indicate the first time-frequency resource.
  • the first indication information may also indirectly indicate the time domain location of the first time-frequency resource.
  • the first indication information may indicate the starting time domain position of the COT and the duration of the COT, so that the first terminal device can determine the time domain resource of the first time-frequency resource based on the starting time domain position of the COT and the duration of the COT.
  • the first indication information may indicate the LBT starting time domain position for LBT on the first time-frequency resource, LBT-related configuration information and the duration of the COT, so that the first terminal device can perform LBT starting time domain position according to the LBT starting time domain position, and
  • the LBT-related configuration information determines the starting time domain position of the COT (that is, the LBT completion time point), and then determines the time domain resource of the first time-frequency resource based on the starting time domain position of the COT and the duration of the COT.
  • a piece of first indication information may indicate one or more first time-frequency resources.
  • the first indication information can be carried (or carried in) the first-level SCI, the second-level SCI, and the side link media access control element (medium access control control element) from the second terminal device.
  • MAC CE or PC5 radio resource control (radio resource control, RRC) signaling at least one piece of information.
  • RRC radio resource control
  • the first indication information when the first indication information is carried in the first-level SCI, the first indication information may be the Frequency resource assignment field and the Time resource assignment field in the first-level SCI, where the Frequency resource assignment field may indicate the first time frequency.
  • the frequency domain location of the resource The Time resource assignment field can indicate the time domain location of the first time-frequency resource.
  • the first indication information may also be other fields in the first-level SCI, and this embodiment of the present application does not specifically limit this.
  • the first terminal device may determine whether to reserve the first time-frequency resource according to preset conditions, which will be described below.
  • the first time-frequency resource is a time-frequency resource within the resource selection window determined by the first terminal device. Specifically, the first terminal device may determine whether the first time-frequency resource is located within the resource selection window according to the time-frequency domain position of the first time-frequency resource. If the first time-frequency resource is within the resource selection window, the first terminal device may further determine whether to reserve the first time-frequency resource according to the conditions introduced below.
  • the first terminal device may determine whether to reserve the first time-frequency resource according to one or more of the following: the first reference signal received power and the number of terminal devices that have reserved the first time-frequency resource. It can be understood that the first The reference signal reception power and/or the number of terminal devices that have reserved the first time-frequency resource may also be referred to as the conditions for the first terminal device to determine whether to reserve the first time-frequency resource. When one or more of the above conditions are met, the first terminal device reserves the first time-frequency resource. At this time, it can be understood that the first time-frequency resource will be reserved by both the first terminal device and the second terminal device, that is, the first terminal device reserves the first time-frequency resource. Time and frequency resources are repeatedly reserved. When all the above conditions are not met, the first terminal device does not reserve the first time-frequency resource.
  • the first reference signal received power is the RSRP measurement result of the DMRS of the PSCCH or PSSCH corresponding to the first indication information.
  • the first reference signal received power is the RSRP measurement result of the DMRS on the PSCCH.
  • the first indication information may be carried in the first level SCI.
  • the first reference signal received power is the RSRP measurement result of the DMRS on the PSSCH.
  • the first terminal equipment measures the signal power received on all resource elements (resource elements, RE) used to carry DMRS on the PSCCH or PSSCH that carries the first indication information, and the average of all measurement results obtained is The first reference signal received power.
  • the number of terminal devices that have reserved the first time-frequency resource refers to the number of terminal devices that have sent first indication information indicating the first time-frequency resource to the first terminal device.
  • the following is an introduction to how the first terminal device determines whether to reserve the first time-frequency resource based on the first reference signal received power and/or the number of terminal devices that have reserved the first time-frequency resource.
  • the first terminal device can determine whether to reserve the first time-frequency resource according to the first reference signal received power.
  • the first terminal device can determine whether to reserve the first time-frequency resource when the first reference signal received power is lower than the first power threshold. , confirm that the first time-frequency resource can be reserved.
  • the first terminal device may receive power when the first reference signal is lower than the second power threshold and higher than the third power. Under the condition of threshold, it is determined that the first time-frequency resource can be reserved.
  • the first power threshold, the second power threshold or the third power threshold may be determined based on the channel busy ratio (CBR), the channel occupancy ratio (CR) and the number of times the channel is detected as busy. Determined by one or more pieces of information.
  • the CBR and/or CR may be determined by listening to the channel corresponding to the first time-frequency resource.
  • the specific The determination method can be set according to actual needs.
  • the first power threshold or the second power threshold may also be determined based on the priority prio TX of the data to be sent by the first terminal device and the priority prio RX indicated by the first indication information.
  • the first power threshold or the second power threshold may also be determined based on the priority prio TX of the data to be sent by the first terminal device and the priority prio RX indicated by the first indication information.
  • mode 2 please refer to the description of mode 2 in this application for the method of determining the RSRP threshold when the terminal device selects time-frequency resources.
  • the first terminal device can determine whether to reserve the first time-frequency resource based on the relationship between the received power of the first reference signal and the preset threshold. Specifically, if the received power of the first reference signal is higher than the preset threshold, it means that the first terminal device and the second terminal device are close to each other, and the LBT results of the two terminal devices are likely to be the same, and there is a high probability that LBT failure will not occur.
  • One party has reserved the first time-frequency resource, resulting in the problem that the party that succeeds in LBT cannot use the first time-frequency resource. That is, there is a high probability that there will be no waste of resources caused by LBT failure, so the first time-frequency resource does not need to be reserved again.
  • the first time-frequency resource is a high probability that there will be no waste of resources caused by LBT failure.
  • the received power of the first reference signal is lower than the preset threshold, it means that the LBT results of the first terminal device and the second terminal device are likely to be different. It may be because the party that failed LBT has reserved the first time-frequency resource, resulting in The party that succeeds in LBT cannot use the first time-frequency resource. Therefore, the first terminal device can repeatedly reserve the first time-frequency resource. If the second terminal device that has reserved the first time-frequency resource fails LBT, if If the LBT of the first terminal device is successful, the first time-frequency resource can also be used by the first terminal device, which improves the overall utilization of the time-frequency resource.
  • the first terminal device can determine whether to reserve the first time-frequency resource based on the number of terminal devices that have reserved the first time-frequency resource. For the situation where the first terminal device can determine whether to reserve the first time-frequency resource based on the number of terminal devices that have reserved the first time-frequency resource, the first terminal device can determine whether to reserve the first time-frequency resource among the terminal devices that have reserved the first time-frequency resource. If the number is lower than the first threshold, it is determined that the first time-frequency resource can be reserved. Wherein, the first terminal device may determine the location of the terminal device that has reserved the first time-frequency domain resource based on indication information (for example, first indication information) from other terminal devices indicating the time-frequency domain location of the first time-frequency resource. quantity.
  • indication information for example, first indication information
  • a terminal device indicates the reserved first time-frequency resource to the first terminal device through a piece of first indication information. Therefore, it is understandable that the first terminal device may also, according to the number of the first indication information, Determine whether to reserve the first time-frequency resource. The first terminal device may determine that the first time-frequency resource can be reserved when the quantity of the first indication information is lower than the first threshold.
  • the first threshold may be determined based on one or more information among CBR, CR and the number of times the channel is detected as busy.
  • the first threshold is lower, and vice versa, the first threshold is higher.
  • the specific determination method can be set according to actual needs.
  • the first terminal device can determine whether to reserve the first time-frequency resource based on the number of terminal devices that have reserved the first time-frequency resource. Specifically, if the number of terminal devices that have reserved the first time-frequency resource is higher than the preset threshold, it means that many terminal devices have repeatedly reserved the first time-frequency resource. In this case, if the first terminal device If the first time-frequency resource is still reserved repeatedly, it is likely that the first time-frequency resource will not be successfully occupied to send data, resulting in service data delay.
  • the number of terminal devices that have reserved the first time-frequency resource is lower than the preset threshold, it means that the number of terminal devices that have repeatedly reserved the first time-frequency resource will not be too many, and the first terminal device has repeatedly reserved the first time-frequency resource. After one time-frequency resource, it is possible to successfully occupy the first time-frequency resource to send data.
  • the first terminal device can determine whether to reserve the first time-frequency resource in combination with the first reference signal received power and the number of terminal devices that have reserved the first time-frequency resource.
  • the first terminal device can When the received power of a reference signal is lower than the first power threshold and the number of terminal devices that have reserved the first time-frequency resource is lower than the first threshold, it is determined that the first time-frequency resource can be reserved.
  • the first terminal device may receive power of the first reference signal below the second power threshold and above the third power threshold, and the number of terminal devices that have reserved the first time-frequency resource is below the first threshold. , confirm that the first time-frequency resource can be reserved. Please refer to the above introduction for details and will not go into details here.
  • the first terminal device determines whether the first terminal device reserves the first time-frequency resource based on conditions related to the first reference signal received power and/or the number of terminal devices that have reserved the first time-frequency resource. It can be understood that if the first time-frequency resource does not meet all the above conditions related to the first reference signal reception power and/or the number of terminal devices that have reserved the first time-frequency resource, the first terminal device determines not to reserve the first time-frequency resource.
  • the first time-frequency resource is reserved, or in other words, the first terminal device excludes the first time-frequency resource. For example, when the received power of the first reference signal is higher than the first power threshold, the first terminal device may determine to exclude the first time-frequency resource. In this case, it can be considered that the distance between the first terminal device and the second terminal device is relatively close, and the LBT success or failure results of the two terminal devices are likely to be the same, and there is no need to implement repeated reservation.
  • the first terminal device may also combine the first LBT completion time point and the above-mentioned conditions related to the first reference signal receiving power and/or the number of terminal devices that have reserved the first time-frequency resources. Determine whether to reserve the first time-frequency resource. Specifically, if the starting time domain position of the first time-frequency resource is the same as or after the first LBT completion time point, and the first time-frequency resource satisfies the above-mentioned requirements for receiving the first reference signal, If the condition is related to power and/or the number of terminal devices that have reserved the first time-frequency resource, then the first terminal device determines to reserve the first time-frequency resource.
  • the first terminal device determines not to reserve the first time-frequency resource.
  • the priorities prio TX corresponding to the multiple different TBs need to be the same, and the number of subchannels used to transmit different resources of different TBs L subCH needs to be same.
  • TB refers to retransmission resources and/or new transmission resources.
  • the first terminal device after the first terminal device determines to reserve the first time-frequency resource, it will send indication information indicating the time-frequency domain location of the first time-frequency resource to other terminal devices, thereby informing other terminal devices that the first terminal device The device has reserved the first time-frequency resource.
  • a terminal device when reserving resources, can determine whether to reserve resources repeatedly based on the first reference signal received power and/or the number of terminal devices that have reserved the first time-frequency resource.
  • the first time-frequency resource so that in the scenario of resource selection through mode2, if a terminal device reserves time-frequency resources but LBT fails, the reserved time-frequency resources can still be repeatedly reserved by other time-frequency resources And LBT is successfully used by terminal equipment, thus improving the utilization of time-frequency resources in the system as a whole and reducing the situation where terminal equipment cannot use the reserved time-frequency resources because other terminal equipment cannot use the reserved time-frequency resources. and the waste of resources caused.
  • FIG. 9 another resource reservation method is provided in this embodiment of the present application.
  • a terminal device is used as the execution subject of the illustration as an example to illustrate the method, but this application does not limit the execution subject of the illustration.
  • the terminal device in Figure 9 may also be a chip, chip system, or processor that supports the terminal device to implement the method, or may be a logic module or software that can realize all or part of the application function network element functions.
  • the resource reservation methods include S701-S702:
  • the first terminal device determines the first LBT completion time point according to the value of the LBT counter.
  • the first terminal device reserves the first time-frequency resource in the resource selection window and/or determines whether to perform resource reselection according to the first LBT completion time point.
  • the terminal device can first determine the LBT completion time point. When reserving resources, the terminal device can reserve time-frequency resources according to the LBT completion time point to avoid failure due to the incomplete LBT. Use reserved time and frequency resources. Alternatively, the terminal device can determine whether to perform resource reselection based on the LBT completion time point, and can use the reselected resources to send data when the reserved time and frequency resources cannot be used because the LBT is not completed.
  • FIG. 9 and the embodiment of FIG. 7 can be combined with each other.
  • the first terminal device determines the specific implementation of the first LBT completion time point based on the value of the LBT counter. Refer to the above introduction to S501, which will not be described again here.
  • the first terminal device can reserve the first time-frequency resource in the resource selection window according to the first LBT completion time point. Specifically, the first terminal device reserves the starting time in the resource selection window.
  • the domain location is the time-frequency resource after the first LBT completion time point.
  • the first terminal device when the first terminal device reserves the first time-frequency resource within the resource selection window, it may further determine whether to combine the first reference signal received power and/or the number of terminal devices that have reserved the first time-frequency resource.
  • the specific implementation of reserving the first time-frequency resource can be referred to the above introduction to S502. How the first terminal device determines the first reference signal receiving power and/or the number of terminal devices that have reserved the first time-frequency resource. Whether to reserve the first time-frequency resource.
  • the first terminal device reserves the first time-frequency resource within the resource selection window
  • it can also be further combined with the existing protocol in which the terminal device reserves the time-frequency resource within the resource selection window. This embodiment of the present application will No specific restrictions are imposed.
  • the first terminal device can determine whether it is necessary to perform the preset processing according to the first LBT completion time point.
  • the first time-frequency resource remaining is used for resource reselection.
  • the first terminal device can use the first time-frequency resource for data transmission. If the starting time domain position of the first time-frequency resource is before the first LBT completion time point, it can be considered that the first time-frequency resource cannot be used after the LBT is completed, and resource reselection needs to be performed.
  • the first LBT completion time point please refer to the above introduction to the first LBT completion time point in S501-S502, which will not be described again here.
  • Condition 1 The starting time domain position of the second time-frequency resource is the same as the LBT completion time point or after the LBT completion time point.
  • the first terminal device can further determine whether the second time-frequency resource satisfies the following conditions 2-5. If the second time-frequency resource satisfies at least one of the following conditions 2-5 , then the first terminal device can select the second time-frequency resource for sending data.
  • Condition 2 The second time-frequency resource is not reserved by other terminal equipment.
  • the received power of the second reference signal is lower than the second threshold.
  • the second reference signal received power is the RSRP measurement result of the DMRS of the PSSCH or PSCCH corresponding to the second indication information.
  • the second indication information is information sent by the second terminal device indicating the time-frequency domain location of the second time-frequency resource. For details, reference may be made to the first indication information.
  • the second threshold is an RSRP threshold determined based on the priority prio RX indicated by the second indication information and the prio TX of the data to be sent by the first terminal device. For details, please refer to the existing mode2, where the terminal device selects time-frequency resources. , how to determine the RSRP threshold value.
  • the received power of the second reference signal is lower than the first power threshold.
  • the received power of the second reference signal is lower than the second power threshold and higher than the third power threshold.
  • the first power threshold, the second power threshold, or the third power threshold may be determined based on one or more pieces of information including CBR, CR, and the number of times the channel is detected as busy.
  • Condition 5 When the second time-frequency resource has been reserved by other terminal devices, the number of terminal devices that have reserved the second time-frequency resource is lower than the first threshold.
  • the size of the second time-frequency resource (the size of the time-domain resource and the size of the frequency-domain resource) reselected by the first terminal device may be consistent with the size of the first time-frequency resource.
  • the first time-frequency resource occupies 1 time slot in the time domain and 1 subchannel in the frequency domain.
  • the first terminal device also chooses to occupy 1 time slot in the time domain and 1 subchannel in the frequency domain.
  • the sub-channel serves as the second time-frequency resource for reselection.
  • the first terminal device reselects the second time-frequency resource in the embodiment of the present application is introduced below with reference to the accompanying drawings.
  • the terminal device reselects resources.
  • the resource reservation method provided by the embodiment of this application may also include S503:
  • the first terminal device performs LBT.
  • the first terminal device may perform LBT on the channel corresponding to the selected time-frequency resource (which may be a reserved first time-frequency resource or a reselected second time-frequency resource), and determine based on the LBT result. Whether the corresponding channel can be accessed is to determine whether the reserved time-frequency resources can be used to transmit data.
  • the first terminal device can perform LBT on the channel corresponding to the selected time-frequency resource after selecting the time-frequency resource, or the first terminal device can also first perform LBT on the channel corresponding to each time-frequency resource included in the resource selection window. LBT is performed on the channel, and then time-frequency resources are selected within the resource selection window. This embodiment of the present application does not limit this.
  • the first terminal device can use the selected time-frequency resources to transmit data.
  • the first terminal device can use the part of the selected time-frequency resources that is after the second LBT completion time point in the time domain.
  • Time-frequency resources this part can be considered The time-frequency resource LBT is successful
  • the first terminal device can also give up the selected time-frequency resource.
  • the first terminal device may give up the selected time-frequency resources.
  • the first terminal device can also perform resource reselection.
  • the first terminal device can use the selected time-frequency resource to transmit data, because the first terminal device selected
  • the time-frequency resources may be reserved by other terminal devices. If the first terminal device and other terminal devices send data on the selected time-frequency resources at the same time, resource conflicts may occur.
  • the following takes the time-frequency resource selected by the first terminal device as the first time-frequency resource reserved by the first terminal device as an example. The solution provided by the embodiment of this application to avoid resource conflicts:
  • the first terminal device determines a time point in the time domain (hereinafter referred to as the first access point). Specifically, the first access point is before the starting time domain position of the first time-frequency resource, and There is a first preset time interval between the first access point and the starting time domain position of the first time-frequency resource. After determining the first access point, the first terminal device accesses the channel corresponding to the first time-frequency resource starting from the first access point, thereby occupying the first time-frequency resource.
  • the first preset duration may be preconfigured, configured by a higher layer, determined according to the priority of the data to be sent by the first terminal device (which may also be called service data of the first terminal device), or determined randomly.
  • the first preset time length may have a granularity of 9 ⁇ s.
  • the first preset duration may be configured as 5 9 ⁇ s
  • the starting time domain position of the first time-frequency resource may be the starting time point of time slot 1
  • the first terminal device may configure the first preset duration and the first time-frequency resource as the starting time point of time slot 1.
  • the starting time domain position of the time-frequency resource is determined to be 45 ⁇ s before the starting time point of time slot 1 by the first access point, so that the channel corresponding to the first time-frequency resource is accessed through the first access point.
  • both the first terminal device and the second terminal device reserve the first time-frequency resource, and both successfully complete the LBT.
  • a schematic diagram of the first terminal device and the second terminal device trying to access the channel corresponding to the first time-frequency resource according to their respective first access points can be shown in Figure 12.
  • the first preset time length preconfigured by the first terminal device is 6 9 ⁇ s, that is, 54 ⁇ s
  • the first preset time length preconfigured by the second terminal device is 4 9 ⁇ s, that is, 36 ⁇ s.
  • the starting time domain position of the first time-frequency resource is the starting time point of time slot 2, and the time slot preceding the first time-frequency resource is time slot 1.
  • the first terminal device starts accessing the channel corresponding to the first time-frequency resource at a time point corresponding to 54 ⁇ s before the starting time domain position of the first time-frequency resource (the first access point of the first terminal device), and the second terminal device At a time point corresponding to 36 ⁇ s before the starting time domain position of the first time-frequency resource (the first access point of the second terminal device), the first terminal device begins to access the channel corresponding to the first time-frequency resource, because the first terminal device begins to access the channel. If the time point is earlier than the time point when the second terminal device starts accessing, the first terminal device can first access the channel corresponding to the first time-frequency resource, so that it can preemptively use the first time-frequency resource to transmit data and avoid resource conflicts.
  • the first preset duration may be directly proportional to the priority of the data to be sent, that is, the priority of the data to be sent. The higher the level, the longer the first preset duration, and the earlier the starting time domain position of the first access point is compared with the first time-frequency resource.
  • both the first terminal device and the second terminal device reserve the first time-frequency resource and both successfully complete LBT
  • the priority of the service data of the first terminal device is higher than that of the second terminal device, Priority of data, because the first access point of the first terminal device is earlier than the first access point of the second terminal device, the first terminal device can access the channel corresponding to the first time-frequency resource before the second terminal device , that is, the first terminal device can occupy the first time-frequency resource first and send service data on the first time-frequency resource first.
  • the terminal device determines whether to repeatedly reserve the first time-frequency resource based on LBT. It can be understood that, when the first time-frequency resource corresponds to a single channel, the first terminal device can implement single-channel access based on the first time-frequency resource. Furthermore, on the basis of single-channel access, the embodiments of this application further consider how to implement multi-channel access based on LBT in the resource reservation scenario of mode 2.
  • the resource reservation method is introduced below.
  • the frequency domain resources corresponding to the resource selection window can be composed of multiple channels, where each channel LBT needs to be done separately.
  • the first terminal device reserves multiple first time-frequency resources in the resource selection window.
  • the MAC layer of the first terminal device determines the number of first time-frequency resources that need to be reserved according to service requirements, and sends indication information for determining the first time-frequency resources that need to be reserved to the physical layer.
  • the MAC layer of the first terminal device indicates to the physical layer the number of first time-frequency resources that need to be reserved (which can also be understood as the total number of interlaces corresponding to multiple channels that need to be LBT), the number of interlaces that need to be LBT The number of interlaces and channel indication information corresponding to multiple channels.
  • the MAC layer of the first terminal device indicates to the physical layer the number of first time-frequency resources that need to be reserved and the number of interlaces corresponding to the multiple channels that need to be LBT.
  • the MAC layer of the first terminal device indicates to the physical layer the resource quantity and channel indication information of the first time-frequency resource that needs to be reserved.
  • the MAC layer of the first terminal device indicates to the physical layer the number of interlaces and channel indication information corresponding to the multiple channels on which LBT needs to be performed.
  • the MAC layer of the first terminal device indicates to the physical layer the number of first time-frequency resources that need to be reserved.
  • the channel indication information may include the number of channels on which LBT needs to be performed, or may include specific information on the channels, and the specific information on the channels may be used to indicate the channels on which LBT needs to be performed. If the channel indication information indicated by the MAC layer to the physical layer includes the number of channels that require LBT, the physical layer determines the specific information of the channel to be accessed or selected, and reports the specific information of the determined channel to the MAC layer. If the MAC layer only indicates to the physical layer the number of first time-frequency resources that need to be reserved, the physical layer determines the specific information of the channel to be accessed or selected (that is, the channel that requires LBT) and the corresponding number of interlaces.
  • the MAC layer indicates to the physical layer the number of first time-frequency resources and the number of interlaces that need to be reserved, the physical layer determines the specific information of the channel to be accessed or selected, and reports the specific information of the determined channel to the MAC layer. .
  • the physical layer and the MAC layer may not exchange channel indication information, but the LBT process determines the channel indication information. It can be understood that the LBT process determines the number of channels, or the specific information of each channel.
  • the number of channels indicated by the channel indication information may be the number of channels that require LBT determined by the first terminal device.
  • the first terminal device may reserve multiple first time-frequency resources that meet at least one of the following conditions within the resource selection window.
  • the plurality of reserved first time-frequency resources respectively correspond to the plurality of channels on which LBT needs to be performed.
  • Condition 6 The first reference signal power of the first time-frequency resource is lower than the first power threshold.
  • the first reference signal power of the first time-frequency resource is lower than the second power threshold and higher than the third power threshold.
  • condition 6 please refer to the introduction of S502 above, and will not be repeated here.
  • Condition 7 The number of terminal devices that have reserved the first time-frequency resource is lower than the first threshold.
  • condition 7 please refer to the above introduction to S502, and will not be repeated here.
  • Condition 8 Within the resource selection window, if the available resources in the time-frequency resources corresponding to a certain channel are not less than Y%, the first terminal device can select the first time-frequency resource to be reserved among the available resources corresponding to the channel. .
  • the first terminal device can randomly select the first time-frequency resource within the available resources corresponding to a certain channel, or it can also select the first time-frequency resource that satisfies the above condition 6 and/or conditions within the available resources corresponding to a certain channel. 7 of the first time-frequency resource, or the first time-frequency resource can be selected based on other conditions within the available resources corresponding to a certain channel. This application does not impose specific restrictions on this.
  • how to determine whether the available resources corresponding to a certain channel are not less than Y% can refer to the existing mode2 scenario, how to exclude time-frequency resources in S A until the remaining resources in S A (where S A is available Resources may be referred to as available resources within the resource selection window) that are not less than X% of the total resources in the resource selection window.
  • the value of Y can be determined in the same way as the value of The embodiment does not limit this.
  • Condition 9 After excluding from the resource selection window the time-frequency resources whose RSRP measurement results of the DMRS of the PSSCH or PSCCH corresponding to the received first-level SCI are higher than the corresponding RSRP threshold, the first terminal equipment can use the remaining time-frequency resources. Select multiple first time-frequency resources within the resource. For details, please refer to the above introduction on how the device excludes time-frequency resources in the resource selection window in the existing mode2 scenario, which will not be described again here.
  • the first terminal device when the first terminal device reserves multiple first time-frequency resources in the resource selection window, it can also select the starting time domain position and the first LBT completion time point corresponding to the multiple channels that require LBT. Corresponding first LBT completion time The first time-frequency resource whose points are the same or whose starting time domain position is after the corresponding first LBT completion time point. For details, reference may be made to the above description of the first terminal device determining whether to reserve the first time-frequency resource according to the first LBT completion time point in S501-S502, which will not be described again here.
  • the first terminal device can reserve multiple first time-frequency resources with the same starting time domain position.
  • the first terminal device accesses channel 1, channel 2, and channel 3 through a Type B multi-channel access process.
  • the LBT process of channel 1, channel 2 and channel 3 maintains the same CW p .
  • the first terminal device can access channel 2 through the Type 1 LBT process.
  • the first terminal device accesses the Before channel 2, listen to channel 1 and channel 3 for 25 ⁇ s.
  • the first terminal device determines the first LBT completion time point corresponding to channel 2 based on the LBT related configuration information corresponding to channel 2, and reserves time-frequency resources 1 whose starting time domain position is the same as or after the first LBT completion time point.
  • Time-frequency resource 2 and time-frequency resource 3 (shown in Figure 13 is that the starting time domain position is the same as the first LBT completion time point). Among them, the starting time domain positions of time-frequency resource 1, time-frequency resource 2 and time-frequency resource 3 are the same.
  • the first terminal device can directly reserve the first time-frequency resource for subsequent transmission of data when reserving the first time-frequency resources corresponding to the multiple channels that need to be accessed. frequency resources. For example, as shown in Figure 14, assume that the first terminal device determines that three time-frequency resources need to be reserved, corresponding to channel 1, channel 2 and channel 3 respectively, and the first terminal device determines to access the LBT process based on Type 1 type. Channel 1, Channel 2 and Channel 3.
  • the initial values of the LBT counter N corresponding to channel 2 and channel 3 are the same, and the initial values of the LBT counter N corresponding to channel 1 are different. If the first terminal device determines that the start time of the LBT corresponding to channel 1, channel 2 and channel 3 is the same, the first LBT completion time point corresponding to channel 2 and channel 3 is the same, and the first LBT completion time point corresponding to channel 1 is on the channel After the first LBT completion time point corresponding to 2 and channel 3, the first terminal device cannot access channel 1, channel 2, and channel 3 at the same time, because the first terminal device cannot maintain access to channel 2 and channel 3 when sending data. To listen to channel 1, the first terminal device needs to suspend the LBT process of channel 1.
  • the first terminal device can reserve the time-frequency resource 2 whose starting time domain position is after the first LBT completion time point corresponding to channel 2, and the starting time domain position is the same as the starting time domain position of the time-frequency resource 2 time-frequency resource 3, and reserve the time-frequency resource 1 whose starting time domain position is a preset time distance from the time-frequency resource 2 and the ending time domain position of time-frequency resource 3, so that the channel 1 and channel can be successfully completed.
  • 2 and channel 3 LBT access channel 1, channel 2 and channel 3 to use time-frequency resource 1, time-frequency resource 2 and time-frequency resource 3.
  • a preset duration can be 4*9 ⁇ s plus the remaining LBT duration after pausing the LBT process of channel 1.
  • a preset period of time may be an expected period of time for performing LBT on channel 1 after the LBT process of channel 1 is re-initialized (not shown in Figure 14).
  • the process for the first terminal device to access the first time-frequency resources based on the LBT process is also different in different situations.
  • the following is an introduction based on different situations.
  • Scenario 1 During the process of performing LBT on channels corresponding to multiple first time-frequency resources (which can also be called the process of multi-channel access), if the LBT of at least one channel fails, all first time-frequency resources are re-initialized.
  • the channel access process corresponding to the resource is to restart LBT for all channels corresponding to the first time-frequency resource.
  • the first terminal device cannot use the first time-frequency resource, and the LBT failure of at least one channel still occurs.
  • Resource reselection can be triggered for all channels that perform LBT.
  • the first terminal device calculates the first LBT completion time points corresponding to the channels corresponding to the multiple first time-frequency resources, and reselects multiple starting time domain positions at the corresponding The second time-frequency resource after the first LBT completion time point.
  • the size of the reselected second time-frequency resource is the same as the size of the corresponding first time-frequency resource.
  • Scenario 2 In the process of multi-channel access, the LBT failure of any channel does not affect the LBT process of other channels.
  • the first terminal device accesses the channel based on the Type 1 LBT process, after the LBT fails, the first terminal device waits for 4*T sl , and then if the first terminal device accesses the channel at T If the listening channel is idle within d , LBT can be continued, that is, LBT counter N can be continued to be decremented. Alternatively, the first terminal device can reinitialize the channel access process and perform LBT on the channel again.
  • the LBT failure of at least one channel can also trigger resource reselection for the channel where the LBT failed.
  • the first terminal device calculates the first LBT completion time point corresponding to the channel where the LBT fails, and reselects the starting time domain position at the corresponding The second time-frequency resource after the first LBT completion time point.
  • the size of the reselected second time frequency resource is the same as the corresponding first time frequency resource.
  • the resources are the same size.
  • the first terminal device when the LBT of a certain channel is successful, when the first terminal device sends data on the corresponding first time-frequency resource, it may reserve a third time-frequency resource for accessing the channel again.
  • the size of the third time-frequency resource may be the same as the size of the corresponding first time-frequency resource.
  • Scenario 3 During the multi-channel access process, for some channels, if the LBT of at least one channel in this part of channels fails, the channel access process corresponding to all first time-frequency resources will be reinitialized and resource reselection will be triggered. For another part of channels, in this part of channels, the LBT failure of any channel does not affect the LBT process of other channels. Only the channel with LBT failure is resource reselected and the second time-frequency resource is reselected.
  • the first terminal device can also perform resource re-evaluation on the first time-frequency resource respectively before a preset time period from the starting time domain position of the first time-frequency resource. If the resource of the first time-frequency resource is re-evaluated, If the evaluation fails, the corresponding second time-frequency resource is re-selected. For example, assuming that a certain first time-frequency resource occupies time slot m in the time domain, the first terminal device can perform resource re-evaluation at time slot m-T3. For specific implementation in this implementation mode, please refer to the above introduction to S501-S502, and will not be described again here.
  • the methods and/or steps implemented by the first terminal device can also be implemented by components (such as chips or circuits) that can be used in the first terminal device.
  • embodiments of the present application also provide a communication device, which is used to implement the above various methods.
  • the communication device may be the first terminal device in the above method embodiment, or a device including the above-mentioned first terminal device, or a component that can be used in the first terminal device.
  • the communication device includes corresponding hardware structures and/or software modules for performing each function.
  • the present application can be implemented in the form of hardware or a combination of hardware and computer software. Whether a function is performed by hardware or computer software driving the hardware depends on the specific application and design constraints of the technical solution. Skilled artisans may implement the described functionality using different methods for each specific application, but such implementations should not be considered beyond the scope of this application.
  • Embodiments of the present application can divide the communication device into functional modules according to the above method embodiments.
  • each functional module can be divided corresponding to each function, or two or more functions can be integrated into one processing module.
  • the above integrated modules can be implemented in the form of hardware or software function modules. It should be noted that the division of modules in the embodiment of the present application is schematic and is only a logical function division. In actual implementation, there may be other division methods.
  • FIG. 15 shows a schematic structural diagram of a communication device 1300.
  • the communication device 1300 includes an interface module 1301 and a processing module 1302.
  • the interface module 1301 may also be called a transceiver module or a transceiver unit.
  • the interface module 1301 is used to implement transceiver functions. For example, it may be a transceiver circuit, a transceiver, a transceiver or a communication interface.
  • the interface module 1301 is configured to receive first indication information from the second terminal device.
  • the first indication information is used to indicate the first time-frequency resource.
  • the first time-frequency resource is reserved for the second terminal device. resources left;
  • Processing module 1302 configured to determine whether to reserve the first time-frequency resource according to one or more of the following: first reference signal reception power and the number of terminal devices that have reserved the first time-frequency resource; first reference signal reception power It is the reference signal received power of the physical sidelink control channel or the physical sidelink shared channel corresponding to the first indication information.
  • the communication device 1300 is presented in the form of dividing various functional modules in an integrated manner.
  • a “module” here may refer to a specific ASIC, circuit, processor and memory that executes one or more software or firmware programs, integrated logic circuits, and/or other devices that may provide the above functions.
  • the communication device 1300 may take the form of the communication device 400 shown in FIG. 6 .
  • the processor 401 in the terminal device shown in FIG. 6 can cause the communication device 400 to execute the resource reservation method in the above method embodiment by calling the computer execution instructions stored in the memory 403.
  • the functions/implementation processes of the interface module 1301 and the processing module 1302 in Figure 13 can be implemented by the processor 401 in the communication device 400 shown in Figure 6 calling the computer execution instructions stored in the memory 403.
  • the function/implementation process of the processing module 1302 in Figure 15 can be The processor 401 in the terminal device shown in Figure 4 calls the computer execution instructions stored in the memory 403 to implement.
  • the function/implementation process of the interface module 1301 in Figure 15 can be implemented through the communication interface in the communication device 400 shown in Figure 6 404 to achieve.
  • the communication device 1300 provided in this embodiment can execute the above resource reservation method, the technical effects it can obtain can be referred to the above method embodiments, which will not be described again here.
  • FIG 16 shows a schematic structural diagram of another communication device 1400.
  • the communication device 1400 includes a processing module 1401.
  • the processing module 1401 is configured to determine the first LBT completion time point according to the value of the LBT counter N.
  • the processing module 1401 is also configured to reserve the first time-frequency resource in the resource selection window and/or determine whether to perform resource reselection according to the first LBT completion time point.
  • the communication device 1400 is presented in the form of dividing various functional modules in an integrated manner.
  • a “module” here may refer to a specific ASIC, circuit, processor and memory that executes one or more software or firmware programs, integrated logic circuits, and/or other devices that may provide the above functions.
  • the communication device 1400 may take the form of the communication device 400 shown in FIG. 4 .
  • the processor 401 in the terminal device shown in FIG. 6 can cause the communication device 400 to execute the resource reservation method in the above method embodiment by calling the computer execution instructions stored in the memory 403.
  • the function/implementation process of the processing module 1401 in Figure 16 can be implemented by the processor 401 in the communication device 400 shown in Figure 6 calling the computer execution instructions stored in the memory 403.
  • the communication device 1400 provided in this embodiment can execute the above resource reservation method, the technical effects it can obtain can be referred to the above method embodiments, which will not be described again here.
  • the above modules or units can be implemented in software, hardware, or a combination of both.
  • the software exists in the form of computer program instructions and is stored in the memory.
  • the processor can be used to execute the program instructions and implement the above method flow.
  • the processor can be built into an SoC (System on a Chip) or ASIC, or it can be an independent semiconductor chip.
  • the processor can further include necessary hardware accelerators, such as field programmable gate array (FPGA), programmable logic device (programmable logic) device, PLD), or a logic circuit that implements dedicated logic operations.
  • FPGA field programmable gate array
  • PLD programmable logic device
  • the hardware can be a CPU, microprocessor, DSP chip, microcontroller unit (MCU), artificial intelligence processor, ASIC, SoC, FPGA, PLD, or dedicated digital circuit , any one or any combination of hardware accelerators or non-integrated discrete devices, which can run the necessary software or do not rely on software to perform the above method process.
  • MCU microcontroller unit
  • ASIC application specific integrated circuit
  • SoC SoC
  • FPGA field-programmable gate array
  • PLD dedicated digital circuit
  • any one or any combination of hardware accelerators or non-integrated discrete devices which can run the necessary software or do not rely on software to perform the above method process.
  • embodiments of the present application also provide a chip system, including: at least one processor and an interface.
  • the at least one processor is coupled to the memory through the interface.
  • the at least one processor executes the computer program or instructions in the memory
  • the communication device further includes a memory.
  • the chip system may be composed of chips, or may include chips and other discrete devices, which is not specifically limited in the embodiments of the present application.
  • the present application provides a computer program product including one or more computer instructions, which when run on a communication device, causes any method in the embodiment of the present application to be executed.
  • the computer may be a general-purpose computer, a special-purpose computer, a computer network, or other programmable device.
  • Computer instructions may be stored in computer-readable storage media.
  • Embodiments of the present application provide a computer-readable storage medium. Instructions are stored in the computer-readable storage medium, and when run on a communication device, any method in the embodiment of the present application is executed.
  • Computer instructions may be transmitted from one computer-readable storage medium to another computer-readable storage medium, for example, the computer instructions may be transmitted from a website, computer, server, or data center over wired (e.g., coaxial cable, optical fiber, digital subscriber (digital subscriber line, DSL)) or wireless (such as infrared, wireless, microwave, etc.) to another website, computer, server or data center.
  • Computer-readable storage media can be any available media that can be accessed by a computer or include one or more data storage devices such as servers and data centers that can be integrated with the media. Available media may be magnetic media (eg, floppy disk, hard disk, magnetic tape), optical media (eg, digital versatile disc (DVD)), or semiconductor media (eg, solid state drive (SSD)), etc.

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Abstract

本申请提供了资源预留方法、装置及存储介质，应用于通信技术领域。本申请提供的资源预留方法包括：第一终端设备接收来自第二终端设备的第一指示信息，第一指示信息用于指示第一时频资源，第一时频资源为第二终端设备预留的资源。第一终端设备根据以下一项或多项确定是否预留第一时频资源：第一参考信号接收功率以及已经预留第一时频资源的终端设备的数量。该方法使终端设备在预留资源时，可以根据第一参考信号接收功率和/或已经预留第一时频资源的终端设备的数量，判断是否重复预留时频资源，从而在通过mode2进行资源选择的场景中，整体上提高系统中时频资源的利用率。

Description

资源预留方法、装置及存储介质
本申请要求于2022年08月12日提交国家知识产权局、申请号为202210972032.2、申请名称为“资源预留方法、装置及存储介质”的中国专利申请的优先权，其全部内容通过引用结合在本申请中。
技术领域
本申请涉及通信技术领域，尤其涉及资源预留方法、装置及存储介质。
背景技术
在无线通信系统中,按照使用频段的不同，频段可以分为授权频段和非授权频段。在非授权频段中，终端设备需要按照竞争的方式使用频谱资源。具体地，终端设备需要通过先听后说(listen before talk，LBT)的方式竞争信道。例如，终端设备在接入信道并开始发送数据之前需要侦听信道是否空闲(idle)，如果信道已经保持空闲一定时间则可以占用信道，如果信道非空闲则需要等待信道重新恢复为空闲后才可以占用信道。
在无线通信系统中,终端设备与终端设备间可以通过PC5接口进行通信，PC5接口中的传输链路被定义为侧行链路(sidelink，SL)，终端设备间采用PC5接口进行通信也可以称为SL通信。
目前，第五代移动通信技术(5th generation mobile communication technology，5G)系统中定义了PC5接口的两种资源分配模式：mode 1和mode 2。mode 2也可以称为用户自选资源模式，该模式中，终端设备使用时频资源不依赖于基站，而是需要根据自身在侦听窗内侦听的结果，从资源选择窗口内自行预留时频资源进行通信。
但是，在非授权频段中，若不同终端设备之间采用mode 2进行SL通信，终端设备如何选择时频资源来发送数据，目前还没有解决方案。例如，若终端设备执行LBT失败，终端设备已经预留的时频资源将无法使用，此时其他终端设备也已经排除此预留资源，从而会造成资源的浪费。
发明内容
本申请实施例提供资源预留方法、装置及存储介质，用于解决在非授权频段中，采用mode 2的终端设备对预留的时频资源进行LBT失败后，预留的时频资源无法使用，造成资源浪费的问题。
为达到上述目的，本申请的实施例采用如下技术方案：
第一方面，提供了一种资源预留方法、装置及存储介质，该方法可以由第一终端设备执行，也可以由第一终端设备的部件(例如处理器、芯片、或芯片系统等)执行，还可以由能实现全部或部分第一终端设备功能的逻辑模块或软件实现。以下以第一终端设备执行该方法为例进行说明，该方法包括：第一终端设备接收来自第二终端设备的第一指示信息，所述第一指示信息用于指示第一时频资源，第一时频资源为第二终端设备预留的资源；第一终端设备根据以下一项或多项确定是否预留第一时频资源：第一参考信号接收功率以及已经预留第一时频资源的终端设备的数量；第一参考信号接收功率为第一指示信息对应的物理侧行链路控制信道或物理侧行链路共享信道的参考信号接收功率。
基于本申请实施例提供的资源预留方法，终端设备在预留资源时，可以根据第一参考信号接收功率和/或已经预留第一时频资源的终端设备的数量，判断是否重复预留第一时频资源，从而可以在通过mode2进行资源选择的场景中，整体上提高系统中时频资源的利用率，降低在终端设备无法使用预留的时频资源的情况下，因为其他终端设备也不能使用预留的时频资源而造成的资源浪费。
结合上述第一方面，在一种可能的设计中，第一终端设备根据第一参考信号接收功率确定是否预留第一时频资源，包括：第一终端设备在第一参考信号接收功率低于第一功率门限的情况下，确定预留第一时频资源；或者，第一终端设备在第一参考信号接收功率低于第二功率门限且高于第三功率门限的情况下，确定预留第一时频资源。
基于本方案，第一终端设备可以根据第一参考信号接收功率与第一功率门限、第二功率门限 和/或第三功率门限的大小关系，确定是否预留第一时频资源。
结合上述第一方面，在一种可能的设计中，第一功率门限，第二功率门限或者第三功率门限是根据信道繁忙比率，信道占用比率和对信道侦听为繁忙的次数中的一项或多项信息确定的。基于本方案，提供了多种确定第一功率门限，第二功率门限或者第三功率门限的方法。
结合上述第一方面，在一种可能的设计中，第一终端设备根据已经预留第一时频资源的终端设备的数量确定是否预留第一时频资源，包括：第一终端设备在已经预留第一时频资源的终端设备的数量低于第一门限的情况下，确定预留第一时频资源。
基于本方案，第一终端设备可以根据已经预留第一时频资源的终端设备的数量，在已经预留第一时频资源的终端设备的数量低于第一门限的情况下，预留第一时频资源，避免因为过多终端设备重复预约同一时频资源，第一终端设备无法接入该时频资源发送数据。
结合上述第一方面，在一种可能的设计中，第一门限是根据信道繁忙比率，信道占用比率和对信道侦听为繁忙的次数中的一项或多项信息确定的。基于本方案，提供了多种确定第一门限的方法。
结合上述第一方面，在一种可能的设计中，第一时频资源在资源选择窗内。
结合上述第一方面，在一种可能的设计中，资源选择窗的起始时域位置是根据第一LBT完成时间点确定的；其中，第一LBT完成时间点是根据LBT计数器的值确定的。基于本方案，可以以LBT完成时间点确定资源选择窗的起始时域位置，保证资源选择窗内的时频资源都在LBT完成时间点之后，不会因为LBT未完成而无法接入时频资源。
结合上述第一方面，在一种可能的设计中，该方法还包括：第一终端设备根据第一LBT完成时间点，确定是否进行资源重选；其中，第一LBT完成时间点是根据LBT计数器的值确定的。
结合上述第一方面，在一种可能的设计中，第一终端设备根据第一LBT完成时间点，判断是否进行资源重选，包括：在第一时频资源的起始时域位置在第一LBT完成时间点之前的情况下，第一终端设备确定进行资源重选并选择第二时频资源，第二时频资源的起始时域位置在第一LBT完成时间点之后；或者，在第一时频资源的起始时域位置在第一LBT完成时间点之后的情况下，第一终端设备确定不进行资源重选。基于本方案，可以在第一时频资源的起始时域位置在LBT完成时间点之前的情况下进行资源重选，重新选择起始时域位置在LBT完成时间点之后的第二时频资源，避免因为LBT未完成，无法接入第一时频资源发送数据。
结合上述第一方面，在一种可能的设计中，第一终端设备选择第二时频资源，包括：第一终端设备根据以下一项或多项选择第二时频资源：第二参考信号接收功率以及已经预留第二时频资源的终端设备的数量；第二参考信号接收功率为第二指示信息对应的物理侧行链路控制信道或物理侧行链路共享信道的参考信号接收功率。基于本方案，提供了多种选择第二时频资源的方式。
结合上述第一方面，在一种可能的设计中，在第一终端设备和第二终端设备的LBT计数器的值递减为0，且第一终端设备的业务数据的优先级高于第二终端设备的业务数据的优先级的情况下，该方法还包括：第一终端设备在第一时频资源上发送业务数据。基于本方案，可以在多个终端设备重复预约同一时频资源，且都LBT成功的情况下，使业务优先级高的终端设备接入第一时频资源发送数据，避免多个终端设备接入同一资源发送数据造成的冲突。
结合上述第一方面，在一种可能的设计中，第一指示信息承载于第一级侧行链路控制信息、第二级侧行链路控制信息、侧行链路媒体接入控制控制元素或者PC5无线资源控制信令中的至少一项信息。基于本方案，提供了多种可以承载第一指示信息的信息。
第二方面，提供了一种资源预留方法、装置及存储介质，该方法可以由第一终端设备执行，也可以由第一终端设备的部件(例如处理器、芯片、或芯片系统等)执行，还可以由能实现全部或部分第一终端设备功能的逻辑模块或软件实现。以下以第一终端设备执行该方法为例进行说明，该方法包括：第一终端设备根据LBT计数器N的值，确定第一LBT完成时间点。第一终端设备根据第一LBT完成时间点，在资源选择窗内预留第一时频资源和/或确定是否进行资源重选。
基于本申请实施例提供的资源预留方法，终端设备可以根据LBT完成时间点预留时频资源，避免因为LBT未完成，导致无法使用预留的时频资源。或者，终端设备可以根据LBT完成时间点判断是否进行资源重选，可以在因为LBT未完成导致无法使用预留的时频资源的情况下，使用 重选的资源发送数据。
结合上述第二方面，在一种可能的设计中，第一终端设备根据第一LBT完成时间点，在资源选择窗内预留第一时频资源，包括：第一终端设备在资源选择窗内预留起始时域位置在第一LBT完成时间点之后的第一时频资源。基于本方案，可以在进行资源预留时，预留起始时域位置在LBT完成时间点之后的第一时频资源，避免因为LBT未完成，无法使用第一时频资源发送数据。
结合上述第二方面，在一种可能的设计中，第一终端设备根据LBT完成时间点，确定是否进行资源重选，包括：在第一时频资源的起始时域位置在LBT完成时间点之前的情况，第一终端设备确定进行资源重选并选择第二时频资源；第二时频资源的起始时域位置在第一LBT完成时间点之后。基于本方案，可以在第一时频资源的起始时域位置在LBT完成时间点之前的情况下进行资源重选，重新选择起始时域位置在LBT完成时间点之后的第二时频资源，可以在因为LBT未完成导致无法使用第一时频资源的情况下，使用第二时频资源发送数据。
结合上述第二方面，在一种可能的设计中，第一终端设备根据以下一项或多项选择第二时频资源：第二参考信号接收功率以及已经预留第二时频资源的终端设备的数量；其中，第二参考信号接收功率为第二指示信息对应的物理侧行链路控制信道或物理侧行链路共享信道的参考信号接收功率。基于本方案，提供了多种选择第二时频资源的方式。
结合上述第二方面，在一种可能的设计中，第一终端设备选择第二时频资源，包括：在已经预留第二时频资源的终端设备的数量低于第一门限的情况下，第一终端设备选择第二时频资源。基于本方案，第一终端设备可以在已经预留第二时频资源的终端设备的数量低于第一门限的情况下，选择第二时频资源，避免因为过多终端设备重复预约第二时频资源，导致第一终端设备无法接入第二时频资源发送数据。
结合上述第二方面，在一种可能的设计中，第一门限是根据信道繁忙比率，信道占用比率和对信道侦听为繁忙的次数中的一项或多项信息确定的。基于本方案，提供了多种确定第一门限的方法。
结合上述第二方面，在一种可能的设计中，第一终端设备选择第二时频资源，包括：在第二时频资源被第二终端设备预留，且第二参考信号接收功率低于第一功率门限的情况下，或者，在第二时频资源被第二终端设备预留，第二参考信号接收功率低于第二功率门限且高于第三功率门限的情况下，第一终端设备选择第二时频资源。基于本方案，第一终端设备可以根据第二参考信号接收功率与第一功率门限、第二功率门限和/或第三功率门限的大小关系，确定是否要选择第二时频资源。
结合上述第二方面，在一种可能的设计中，第一功率门限，第二功率门限或者第三功率门限是根据信道繁忙比率，信道占用比率和对信道侦听为繁忙的次数中的一项或多项信息确定的。基于本方案，提供了多种确定第一功率门限，第二功率门限或者第三功率门限的方法。
结合上述第二方面，在一种可能的设计中，第一终端设备选择第二时频资源，包括：在第二时频资源被第二终端设备预留，且第二参考信号接收功率低于第二门限的情况下，第一终端设备选择第二时频资源。基于本方案，第一终端设备可以根据第二参考信号接收功率与第二门限的大小关系，确定是否要选择第二时频资源。
结合上述第二方面，在一种可能的设计中，第二门限是根据第二指示信息指示的优先级以及第一终端设备待发送的数据的优先级确定的；其中，第二指示信息用于指示第二时频资源。基于本方案，提供了一种确定第二门限的方法。
第三方面，提供了一种通信装置用于实现上述各种方法。该通信装置可以为上述第一方面或者第二方面中的第一终端设备，或者包含上述第一终端设备的装置，或者上述第一终端设备中包含的装置，比如芯片。
所述通信装置包括实现上述方法相应的模块、单元、或手段(means)，该模块、单元、或means可以通过硬件实现，软件实现，或者通过硬件执行相应的软件实现。该硬件或软件包括一个或多个与上述功能相对应的模块或单元。
第四方面，提供了一种通信装置，包括：处理器，该处理器用于执行存储器存储的指令，当该处理器执行该指令时，以使该通信装置执行上述任一方面所述的方法。该通信装置可以为上述 第一方面或者第二方面中的第一终端设备，或者包含上述第一终端设备的装置，或者上述第一终端设备中包含的装置，比如芯片。
一种可能的设计中，该通信装置还包括存储器，该存储器用于存储计算机指令。可选的，处理器和存储器集成在一起，或者，处理器和存储器分开设置。
一种可能的设计中，该存储器与处理器耦合，且在该通信装置之外。
第五方面，提供了一种通信装置，包括：处理器和接口电路，该接口电路用于与该通信装置之外的模块通信；该处理器用于通过逻辑电路，或者通过运行计算机程序或指令执行上述任一方面所述的方法。该通信装置可以为上述第一方面或者第二方面中的第一终端设备，或者包含上述第一终端设备的装置，或者上述第一终端设备中包含的装置，比如芯片。
或者，该接口电路可以为代码/数据读写接口电路，该接口电路用于接收计算机执行指令(计算机执行指令存储在存储器中，可能直接从存储器读取，或可能经过其他器件)并传输至该处理器，以使该处理器运行计算机执行指令以执行上述任一方面所述的方法。
在一些可能的设计中，该通信装置可以为芯片或芯片系统。
第六方面，提供了一种计算机可读存储介质，该计算机可读存储介质中存储有指令，当其在通信装置上运行时，使得通信装置可以执行上述任一方面所述的方法。该通信装置可以为上述第一方面或者第二方面中的第一终端设备，或者包含上述第一终端设备的装置，或者上述第一终端设备中包含的装置，比如芯片。
第七方面，提供了一种包含指令的计算机程序产品，当其在通信装置上运行时，使得通信装置可以执行上述任一方面所述的方法。该通信装置可以为上述第一方面或者第二方面中的第一终端设备，或者包含上述第一终端设备的装置，或者上述第一终端设备中包含的装置，比如芯片。
第八方面，提供了一种通信装置(例如，该通信装置可以是芯片或芯片系统)，该通信装置包括处理器，用于实现上述任一方面中所涉及的功能。在一种可能的设计中，该通信装置还包括存储器，该存储器，用于保存必要的程序指令和数据。该通信装置是芯片系统时，可以由芯片构成，也可以包含芯片和其他分立器件。
其中，第三方面至第八方面中任一种设计方式所带来的技术效果可参见上述第一方面至第二方面中不同设计方式所带来的技术效果，此处不再赘述。
附图说明
图1为本申请实施例提供的一种LBT示意图；
图2为本申请实施例提供的一种交错资源的示意图；
图3为本申请实施例提供的另一种交错资源的示意图；
图4为本申请实施例提供的一种资源选择的示意图；
图5为本申请实施例提供的一种通信系统的架构示意图；
图6为本申请实施例提供的一种通信装置的结构示意图；
图7为本申请实施例提供的一种资源预留方法的交互示意图；
图8为本申请实施例提供的一种资源选择窗的示意图；
图9为本申请实施例提供的一种资源预留方法的流程示意图；
图10为本申请实施例提供的一种重选第二时频资源的示意图；
图11为本申请实施例提供的另一种重选第二时频资源的示意图；
图12为本申请实施例提供的一种预留资源的示意图；
图13为本申请实施例提供的一种预留多个时频资源的示意图；
图14为本申请实施例提供的另一种预留多个时频资源的示意图；
图15为本申请实施例提供的一种通信装置的结构示意图；
图16为本申请实施例提供的另一种通信装置的结构示意图。
具体实施方式
为了方便理解本申请实施例的技术方案，首先给出本申请相关技术的简要介绍如下。
1、LBT：
在无线通信系统中,按照使用频段的不同，频段可以分为授权频段和非授权频段。在非授权频段中，设备(网络设备或者终端设备)需要通过先听后说LBT的方式竞争信道。具体地，设备在接入信道并开始发送数据之前需要侦听信道是否空闲(idle)，如果信道已经保持空闲一定时间则可以占用信道，如果信道非空闲则需要等待信道重新恢复为空闲后才可以占用信道。在非授权频段的新空口(new radio，NR)协议中，设备可以使用如下几种类型的LBT接入信道：Type 1 LBT、Type 2A LBT、Type 2B LBT或者Type 2C LBT。以下分别对这几种LBT类型进行介绍。
Type 1 LBT：设备需要进行随机退避才能接入信道并发送数据。
Type 1 LBT的基本流程包括如下步骤，设备在一段延长持续时间(defer duration)(记为Td)内首次侦听信道为空闲后，可以在如下步骤中的计数器N为零之后，发起传输。其中，计数器的调整是根据设备在侦听时隙时段，即如下步骤中的Tsl内的侦听结果确定的。
步骤1：设置N＝Ninit，其中Ninit为均匀分布在0和CWp之间的随机数，执行步骤4；
步骤2：如果N>0，网络设备或终端设备选择递减计数器，则设置N＝N-1。
步骤3：侦听信道以获得额外的侦听时隙时段Tsl，如果额外的侦听时隙时段的信道是空闲的，则转至步骤4；否则，转至步骤5。
步骤4：如果N＝0，停止；否则，执行步骤2。
步骤5：侦听信道，直到在另一个Td内侦听到信道繁忙或侦听到另一个Td内所有侦听时隙都被检测为信道空闲。
步骤6：如果在另一个Td内的侦听时隙都被检测为信道空闲，则执行步骤4；否则，执行步骤5。
本申请实施例中，可以将上述步骤1-步骤6中，用于LBT流程的计数器N称为LBT计数器。
上述步骤1-步骤6中，Td包括持续时间Tf＝16μs以及紧随其后的mp个连续的侦听时隙时段(记作Tsl)，Tf包括在其开始时的一个空闲的侦听时隙时段Tsl。设备对信道进行侦听的基本单元是侦听时隙时段Tsl＝9μs。如果设备在侦听时隙时段Tsl内侦听信道，并确定至少4us内的检测功率小于能量检测阈值，则认为侦听时隙时段内信道是空闲的。否则，认为侦听时隙时段内信道是繁忙的。
上述步骤1-步骤6中，mp、CWmin,p和CWmax,p是基于与设备的数据传输相关联的信道接入优先级等级p确定的，具体地，设备维护p与mp、CWmin,p和CWmax,p之间的映射关系，从而根据高层配置的p，确定mp、CWmin,p和CWmax,p，进行LBT。
示例性的，图1为一种可能的情况中，设备执行Type 1 LBT，侦听信道直至接入信道的示意图。如图1所示，设备设置的递减计数器N＝6，设备在第一个Td内侦听到信道是空闲的，则设备继续在第一个Tsl内侦听信道，第一个Tsl内侦听到信道是空闲的，则第一个Tsl结束的时刻N＝5，设备继续在第二个Tsl内侦听信道，第二个Tsl内侦听到信道是空闲的，则第二个Tsl结束的时刻N＝4。之后设备侦听到信道繁忙，则设备持续侦听信道，直到在第二个Td内侦听到信道是空闲的，设备继续在第三个Tsl内侦听信道，第三个Tsl内侦听到信道是空闲的，则第三个Tsl结束的时刻N＝3。之后设备侦听到信道繁忙，则设备持续侦听信道，直到在第三个Td内侦听到信道是空闲的，设备继续在第四个Tsl内侦听信道，第四个Tsl内侦听到信道是空闲的，则第四个Tsl结束的时刻N＝2，设备继续在第五个Tsl内侦听信道，第五个Tsl内侦听到信道是空闲的，则第五个Tsl结束的时刻N＝1，设备继续在第六个Tsl内侦听信道，第六个Tsl内侦听到信道是空闲的，则第六个Tsl结束的时刻N＝0。则设备在第六个Tsl结束后，即N＝0后，接入信道并在信道占用时间(channel occupancy time，COT)内传输数据。
Type 2A LBT：设备在侦听到信道持续空闲25μs后就可以接入信道并发送数据。
Type 2B LBT：设备在侦听到信道持续空闲16μs后就可以接入信道并发送数据。
Type 2C LBT：设备不需要侦听信道，在COT内经过至多16μs的转换间隔后可以直接接入信道并发送数据。其中，COT指设备在成功接入信道后允许占用信道的时间。具体地，若设备已经接入信道并发送数据，如果前次数据传输和下一次数据传输的间隔小于16μs，前次数据传输结束后设备无需侦听信道，可以在下一次数据传输时立即进行传输。
另外，目前对于非授权频段，各地对于信道对应的占用信道带宽(occupied channel bandwidth，OCB)有一定要求，一般规定OCB至少为正常带宽的80％。例如，信道带宽为20MHz，则设备至少需要占用16MHz的带宽才可以占用该20MHz信道。因此，为保证OCB要求，NR系统引入 了交错资源块(interlaced resource block,interlaced RB)的概念，定义交错(interlace)资源m(也称为交错m上的资源)包括{m,M+m,2M+m,3M+m,…}个RB，其中，m∈{0,1,…,M-1}。如图2所示，对于子载波间隔(subcarrier spacing，SCS)为15kHz的信道，包括10个交错(interlace 0～interlace 9)资源，设备1可以使用交错0(interlace 0)上的资源，包括{RB0，RB10，…，RB90}，设备2可以使用交错1(interlace 1)上的资源，包括{RB1，RB11，…，RB91}，其余设备使用交错资源的情况以此类推。
需要说明的是，在本申请实施例中，interlace和子信道可以替换使用。
对于设备使用多个交错资源，目前有两种资源分配方式。如图3所示，假设每个信道的带宽为20MHz，图3中的3a和3b都可以用于表示设备使用4个交错资源(子信道)。其中，3a表示设备在4个信道的每个信道中都使用1个交错资源；3b表示设备在1个信道中使用4个交错资源。
可选的，设备在信道上执行LBT后，为了避免不同信道的干扰，设备不在信道占用的整个带宽上发送数据，而是留有一部分频域资源作为保护带宽(guard band)，并且在剩余的频域资源发送数据，该用于发送数据的可用资源可被称作资源块集合(RB set)。
需要说明的是，在本申请实施例中，信道、RB set可以替换使用。
2、SL通信中的mode 2
在无线通信系统中，终端设备与终端设备间可以通过PC5接口进行通信，PC5接口中的传输链路被定义为SL，因此，终端设备间采用PC5接口进行通信也可以称为SL通信。
目前，NR系统中定义了PC5接口的两种资源分配模式：mode 1和mode 2。在mode 1中，基站为终端设备分配时频资源。而mode 2可以称为用户自选资源模式，该模式中，终端设备使用时频资源不依赖于基站，而是需要根据自身在侦听窗内侦听的结果，从资源选择窗内选择资源并进行预留(reserved)，或者说预约时频资源，从而选择预留的时频资源进行SL通信，传输数据。
以下对mode 2中终端设备选择时频资源的具体实现进行介绍。
终端设备在进行资源选择前，需要获取SL资源池配置信息，SL资源池配置信息可以指示SL资源池。SL资源池是时频资源的集合，其中的时频资源可以用于终端设备间的SL通信。
假设终端设备在时隙n触发资源选择，具体的资源选择流程包括如下步骤：
步骤1：确定资源选择窗[n+T1,n+T2]。其中，T1为用户实现，且满足是根据相关的配置信息确定的。对于T2，终端设备的高层参数配置T2min，如果T2min小于剩余包延迟预算(packet delay budget，PDB)，那么T2满足T2min≤T2≤剩余PDB；否则，T2等于剩余PDB。资源选择窗的时域资源在SL资源池的时域资源内，资源选择窗的频域资源与SL资源池的频域资源相同。
步骤2：确定侦听窗其中，T0和是根据相关的配置信息确定的。
步骤3：确定参考信号接收功率(reference signal received power，RSRP)门限值，RSRP门限值和待发送数据的优先级prioTX以及接收到的侧行链路控制信息(sidelink control information，SCI)所指示的优先级prioRX有关。
步骤4：初始化资源集合SA包括资源选择窗中所有时频资源，其中，资源选择窗内的时频资源时域上以一个时隙为单位，频域上以LsubCH个连续子信道为单位。
步骤5：从SA排除以下时频资源：侦听窗中未侦听的时隙所对应的资源选择窗内的时频资源。
步骤5a：如果步骤5中，从SA中排除的时频资源少于资源选择窗包括的总资源的X％，重新执行步骤4来初始化SA。其中，X的取值由SL资源池配置信息配置。
步骤6：继续从SA中排除以下时频资源：接收的第一级SCI译码成功，该接收的第一级SCI所预留的时频资源在资源选择窗内，且该接收的第一级SCI对应的物理侧行链路共享信道(physical sidelink shared channel，PSSCH)或物理侧行链路控制信道(physical sidelink control channel，PSCCH)的解调参考信号(demodulation reference signal，DMRS)的RSRP测量结果高于步骤3确定的对应的RSRP门限值。
例如，终端设备1接收到来自终端设备2的第一级SCI，该第一级SCI指示时频资源1的时频域位置位于资源选择窗内，则终端设备可以根据该第一级SCI确定终端设备2已经预留了时频资源1，且根据自身的待发送数据的prioTX以及该第一级SCI所指示的优先级prioRX确定了时频资源1对应的RSRP门限值。终端设备1对时频资源1的PSSCH的DMRS进行RSRP测量，若得 到的RSRP测量结果高于时频资源1对应的RSRP门限值，则终端设备从SA中排除时频资源1。
步骤7：如果SA中剩余候选资源数量少于资源选择窗包括的总资源的X％，则提升步骤3所确定的RSRP门限值(每次提升3dB)并执行步骤4中的资源初始化过程。此时，SA中剩余候选资源可以称为资源选择窗内的可用资源。
终端设备将SA上报给媒体接入控制(medium access control element，MAC)层。MAC层在SA中随机选择时频资源用于发送数据。终端设备会向其他终端设备发送第一级SCI，指示选择的时频资源的时频域位置，以使其他终端设备确定该时频资源已被预留，终端设备发送的第一级SCI所指示的时频资源，也可以称为终端设备预留的时频资源。
示例性的，图4为一种可能的情况中，终端设备根据侦听窗内的侦听结果，在资源选择窗内排除时频资源的示意图。如图4所示，终端设备分别在侦听窗内的时频资源1和3上接收到不同的2个第一级SCI，其中，时频资源1上接收到的第一级SCI指示了时频资源2、时频资源5和时频资源6，时频资源3上接收到的第一级SCI指示了时频资源4、时频资源7和时频资源8。终端设备在时隙n触发资源选择，终端设备根据这2个第一级SCI，确定时频资源2和时频资源4不在资源选择窗内，时频资源5、时频资源6、时频资源7和时频资源8在资源选择窗内且已被其他终端设备预留。终端设备根据自身的待发送数据的prioTX以及这2个第一级SCI分别指示的优先级，确定时频资源5、时频资源6、时频资源7和时频资源8分别对应的RSRP门限值，终端设备分别对接收到的2个第一级SCI对应的PSSCH的DMRS进行测量，得到的RSRP均高于对应的RSRP门限值，则终端设备排除资源选择窗内的时频资源5、时频资源6、时频资源7和时频资源8。
可选的，终端设备在通过选择的时频资源发送数据之前，可以对选择的时频资源对进行重评估。如果时频资源在重评估中被排除，则终端设备可以重新选择时频资源。具体地，终端设备再次执行上述资源选择流程中的步骤1-步骤7，判断选择的时频资源是否会被排除，如果选择的时频资源在再次执行的流程中被排除，则终端设备需要重新选择时频资源。假设选择的时频资源所在的时隙为m，终端设备可以在时隙m-T3前后触发资源重评估，其中，是根据SL部分带宽(bandwidth part，BWP)配置信息确定的。
另外，在mode 2中，终端设备可以采用动态调度方式或者半静态调度(semi-persistent scheme，SPS)方式来选择和预留资源。其中，动态调度方式能够为单个传输块(transportblock，TB)选择资源，且为同一个TB的重传预留资源。SPS方式能够为多个TB选择资源，且为多个TB的重传预留资源。其中，预留资源可以是周期性的，也可以是非周期性的。在预留资源是周期性的情况下，不同周期中的预留资源用于传输不同TB。在预留资源是非周期性的情况下，预留资源用于传输相同的TB，可以理解为预留同一个TB的重传资源。
3、多信道接入
在非授权频段中，设备可以通过上文介绍的Type 1或者Type 2类型的LBT接入信道，实现多信道接入。以下分别介绍不同类型的多信道接入流程。
1)Type A多信道接入流程：
设备可以基于Type 1类型的LBT流程，在每个信道ci∈C执行信道接入流程，其中C为设备准备进行传输的信道集合。信道ci的计数器记为i＝0,1,…,q，q为总信道数量。
Type A1多信道接入流程：每个信道ci的计数器分别独立确定，记为当设备接入信道cj∈C，设备停止侦听C中的其他信道。当设备在信道cj上停止传输，对于其他信道ci≠cj，设备在等待4*Tsl后，如果再在Td内侦听信道为空闲状态则可以继续递减或者，设备可以重新初始化
TypeA2多信道接入流程：信道cj∈C的计数器记为其中cj是配置最大CWp值的信道。对于其他信道ci满足即每个信道的计数器的初始值统一。当设备接入信道cj∈C，设备停止侦听C中的其他信道。当设备在任何信道ci∈C上停止传输，设备重新初始化所有信道的计数器
2)Type B多信道接入流程：
设备通过以下方式选择信道cj∈C：设备在每个信道ci∈C传输前，在集合C中选择信道cj，其中，在信道cj不是随机选择的情况下，设备选择信道cj的频率不超过每秒一次，其中C为设备准备进行传输的信道集合，i＝0,1,…,q，q为总信道数量。
信道cj接入：设备可以基于现有的Type 1类型的LBT流程，接入信道cj。
信道ci≠cj(ci∈C)接入：对于每个信道ci，设备在接入信道cj前要对信道ci侦听至少Tmc＝25us，设备在侦听ci至少Tmc且结果为空闲后，设备可以在信道ci发送数据。换言之，设备对信道ci的侦听时间为接入信道cj前至少Tmc时长，如果信道ci在Tmc时间段内侦听结果都为空闲，则认为信道ci空闲。
Type B1多信道接入流程：对信道集合C维护一个CWp。
Type B2多信道接入流程：每个信道ci∈C独立配置CWp值。其中，信道cj的计数器Ninit由信道cj1∈C的CWp值确定，其中cj1为信道集合C中CWp值最大的信道。
从上文介绍可知，在非授权频段中，设备需要进行LBT来接入信道传输数据，而在SL通信中，若终端设备采用mode 2，终端设备需要通过在资源选择窗内预留时频资源的方式来选择时频资源传输数据。但是，对于非授权频段中，终端设备mode 2进行SL通信的场景，终端设备如何选择时频资源来发送数据，目前还没有解决方案。例如，若终端设备在资源选择窗内预留时频资源后，对该时频资源对应的信道执行LBT，如果在终端设备已经预留的时频资源的起始时域位置，终端设备还未完成LBT，则终端设备已经预留的时频资源将无法使用，此时其他终端设备也已经排除此预留资源，从而会造成资源的浪费。
下面将结合本申请实施例中的附图，对本申请实施例中的技术方案进行描述。其中，在本申请的描述中，除非另有说明，“/”表示前后关联的对象是一种“或”的关系，例如，A/B可以表示A或B；本申请中的“和/或”仅仅是一种描述关联对象的关联关系，表示可以存在三种关系，例如，A和/或B，可以表示：单独存在A，同时存在A和B，单独存在B这三种情况，其中A,B可以是单数或者复数。并且，在本申请的描述中，除非另有说明，“多个”是指两个或多于两个。“以下至少一项(个)”或其类似表达，是指的这些项中的任意组合，包括单项(个)或复数项(个)的任意组合。例如，a，b，或c中的至少一项(个)，可以表示：a，b，c，a-b，a-c，b-c，或a-b-c，其中a，b，c可以是单个，也可以是多个。另外，为了便于清楚描述本申请实施例的技术方案，在本申请的实施例中，采用了“第一”、“第二”等字样对功能和作用基本相同的相同项或相似项进行区分。本领域技术人员可以理解“第一”、“第二”等字样并不对数量和执行次序进行限定，并且“第一”、“第二”等字样也并不限定一定不同。同时，在本申请实施例中，“示例性的”或者“例如”等词用于表示作例子、例证或说明。本申请实施例中被描述为“示例性的”或者“例如”的任何实施例或设计方案不应被解释为比其它实施例或设计方案更优选或更具优势。确切而言，使用“示例性的”或者“例如”等词旨在以具体方式呈现相关概念，便于理解。
需要说明的是，本申请实施例描述的网络架构以及业务场景是为了更加清楚的说明本申请实施例的技术方案，并不构成对于本申请实施例提供的技术方案的限定，本领域普通技术人员可知，随着网络架构的演变和新业务场景的出现，本申请实施例提供的技术方案对于类似的技术问题，同样适用。
本申请实施例提供的资源预留方法可以适用于各种通信系统。例如，本申请实施例提供的资源预留方法可以应用于长期演进(long term evolution，LTE)系统，或者5G系统，或者终端设备之间可以直接通信的系统，例如设备到设备(device-to-device，D2D)或者车联万物(vehicle-to-everything，V2X)等系统，或者其他面向未来的类似新通信系统，例如第6代(sixth-generation，6G)系统，本申请实施例对此不作具体限定。
如图5所示，为本申请实施例提供的一种通信系统30。该通信系统30包括多个终端设备40。其中，不同的终端设备40之间可以相互通信。终端设备40可以是固定位置的，也可以是可移动的。
需要说明的是，图5仅是示意图，本申请实施例并不限定通信系统30包括3个终端设备40。另外，虽然未示出，但是该通信系统30中还可以包括其它设备，如该通信系统30还可以包括网络设备，终端设备40可以在网络设备的覆盖范围内，也可以在网络设备的覆盖范围外，在此不做具体限定。
以图5所示的不同终端设备40之间进行交互为例，本申请实施例提供的资源预留方法中，该方案的具体实现和技术效果将在后续方法实施例中详细描述，在此不予赘述。
可选的，本申请实施例中的网络设备，是一种将终端设备接入到无线网络的设备。本申请实施例中的网络设备可以包括各种形式的基站(base station)，例如，可以是宏基站、微基站(也 称为小站)、中继站、接入点、发射点(transmitting point，TP)、演进型基站(evolved NodeB，eNodeB)、发送接收点(transmission reception point，TRP)、5G移动通信系统中的下一代基站(next generation NodeB，gNB)、5G之后演进的通信系统中实现基站功能的设备、移动交换中心以及设备到设备(Device-to-Device，D2D)、车辆外联(vehicle-to-everything，V2X)、机器到机器(machine-to-machine，M2M)通信中承担基站功能的设备等；也可以是NTN通信系统中的网络设备，即可以部署于高空平台或者卫星；也可以是完成基站部分功能的模块或单元，例如，可以是云接入网(cloud radio access network，C-RAN)系统中的集中式单元(central unit，CU)，也可以是分布式单元(distributed unit，DU)。本申请的实施例对网络设备所采用的具体技术和具体设备形态不做限定。网络设备的全部或部分功能也可以通过在硬件上运行的软件功能来实现，或者通过平台(例如云平台)上实例化的虚拟化功能来实现。在本申请中，如果无特殊说明，网络设备指无线接入网设备。
可选的，本申请实施例中的终端设备，可以是一种具有无线收发功能的设备，也可以称为终端(terminal)。终端设备具体可以指用户设备(user equipment，UE)、接入终端、用户单元(subscriber unit)、用户站、移动台(mobile station)、客户终端设备(customer-premises equipment，CPE)、远方站、远程终端、移动设备、移动终端、用户终端、无线通信设备、用户代理或用户装置等。终端设备还可以是卫星电话、蜂窝电话、智能手机、无绳电话、会话启动协议(session initiation protocol，SIP)电话、无线数据卡、无线调制解调器、平板电脑、带无线收发功能的电脑、无线本地环路(wireless local loop，WLL)站、个人数字处理(personal digital assistant，PDA)、具有无线通信功能的手持设备、计算设备或连接到无线调制解调器的其它处理设备、车载设备、高空飞机上搭载的通信设备、可穿戴设备、无人机、机器人、智能销售点(point of sale，POS)机、机器类型通信设备、D2D中的终端设备、V2X中的终端设备、虚拟现实(virtual reality，VR)终端设备、增强现实(augmented reality，AR)终端设备、工业控制(industrial control)中的无线终端、无人驾驶(selfdriving)中的无线终端、远程医疗(remote medical)中的无线终端、智能电网(smart grid)中的无线终端、运输安全(transportation safety)中的无线终端、智慧城市(smart city)中的无线终端、智慧家庭(smart home)中的无线终端或者未来通信网络中的终端设备等等。本申请的实施例对终端设备所采用的具体技术和具体设备形态不做限定。终端设备的全部或部分功能也可以通过在硬件上运行的软件功能来实现，或者通过平台(例如云平台)上实例化的虚拟化功能来实现。
可选的，本申请实施例中的网络设备或者终端设备可以部署在陆地上，包括室内或室外、手持或车载；也可以部署在水面上；还可以部署在空中的飞机、气球和人造卫星上。本申请的实施例对网络设备或者终端设备的应用场景不做限定。
可选的，本申请实施例中的网络设备或者终端设备也可以称之为通信装置，其可以是一个通用设备或者是一个专用设备，本申请实施例对此不作具体限定。
可选的，本申请实施例中的终端设备的相关功能可以由一个设备实现，也可以由多个设备共同实现，还可以是由一个设备内的一个或多个功能模块实现，本申请实施例对此不作具体限定。可以理解的是，上述功能既可以是硬件设备中的网络元件，也可以是在专用硬件上运行的软件功能，或者是硬件与软件的结合，或者是平台(例如，云平台)上实例化的虚拟化功能。
例如，本申请实施例中的终端设备的相关功能可以通过图6中的通信设备400来实现。图6所示为本申请实施例提供的通信设备400的结构示意图。该通信设备400包括一个或多个处理器401，通信线路402，以及至少一个通信接口(图6中仅是示例性的以包括通信接口404，以及一个处理器401为例进行说明)，可选的还可以包括存储器403。
处理器401可以是一个通用中央处理器(central processing unit，CPU)，微处理器，特定应用集成电路(application-specific integrated circuit，ASIC)，或一个或多个用于控制本申请方案程序执行的集成电路。
通信线路402可包括一通路，用于连接不同组件之间。
通信接口404，可以是收发模块用于与其他设备或通信网络通信，如以太网，RAN，无线局域网(wireless local area networks，WLAN)等。例如，所述收发模块可以是收发器、收发机一类的装置。可选的，所述通信接口404也可以是位于处理器401内的收发电路，用以实现处理器的信 号输入和信号输出。
存储器403可以是具有存储功能的装置。例如可以是只读存储器(read-only memory，ROM)或可存储静态信息和指令的其他类型的静态存储设备，随机存取存储器(random access memory，RAM)或者可存储信息和指令的其他类型的动态存储设备，也可以是电可擦可编程只读存储器(electrically erasable programmable read-only memory，EEPROM)、只读光盘(compact disc read-only memory，CD-ROM)或其他光盘存储、光碟存储(包括压缩光碟、激光碟、光碟、数字通用光碟、蓝光光碟等)、磁盘存储介质或者其他磁存储设备、或者能够用于携带或存储具有指令或数据结构形式的期望的程序代码并能够由计算机存取的任何其他介质，但不限于此。存储器可以是独立存在，通过通信线路402与处理器相连接。存储器也可以和处理器集成在一起。
其中，存储器403用于存储执行本申请方案的计算机执行指令，并由处理器401来控制执行。处理器401用于执行存储器403中存储的计算机执行指令，从而实现本申请实施例中提供的资源预留方法。
或者，可选的，本申请实施例中，也可以是处理器401执行本申请下述实施例提供的资源预留方法中的处理相关的功能，通信接口404负责与其他设备或通信网络通信，本申请实施例对此不作具体限定。
可选的，本申请实施例中的计算机执行指令也可以称之为应用程序代码，本申请实施例对此不作具体限定。
在具体实现中，作为一种实施例，处理器401可以包括一个或多个CPU，例如图6中的CPU0和CPU1。
在具体实现中，作为一种实施例，通信设备400可以包括多个处理器。这些处理器中的每一个可以是一个单核(single-core)处理器，也可以是一个多核(multi-core)处理器。这里的处理器可以包括但不限于以下至少一种：中央处理单元(central processing unit，CPU)、微处理器、数字信号处理器(DSP)、微控制器(microcontroller unit，MCU)、或人工智能处理器等各类运行软件的计算设备，每种计算设备可包括一个或多个用于执行软件指令以进行运算或处理的核。
在具体实现中，作为一种实施例，通信设备400还可以包括输出设备405和输入设备406。输出设备405和处理器401通信，可以以多种方式来显示信息。例如，输出设备405可以是液晶显示器(liquid crystal display，LCD)，发光二级管(light emitting diode，LED)显示设备，阴极射线管(cathode ray tube，CRT)显示设备，或投影仪(projector)等。输入设备406和处理器401通信，可以以多种方式接收用户的输入。例如，输入设备406可以是鼠标、键盘、触摸屏设备或传感设备等。
上述的通信设备400有时也可以称为通信装置，其可以是一个通用设备或者是一个专用设备。例如通信设备400可以是台式机、便携式电脑、网络服务器、掌上电脑(personal digital assistant，PDA)、移动手机、平板电脑、无线终端设备、嵌入式设备、上述终端设备，上述网络设备、或具有图4中类似结构的设备。本申请实施例不限定通信设备400的类型。
下面将结合图1至图6，对本申请实施例提供的资源预留方法进行展开说明。
需要说明的是，本申请下述实施例中各个网元之间的消息名字或消息中各参数的名字等只是一个示例，具体实现中也可以是其他的名字，本申请实施例对此不作具体限定。
如图7所示，为本申请实施例提供的一种资源预留方法。图7中以终端设备作为该交互示意的执行主体为例来示意该方法，但本申请并不限制该交互示意的执行主体。例如，图7中的终端设备也可以是支持该终端设备实现该方法的芯片、芯片系统、或处理器，还可以是能实现全部或部分应用功能网元功能的逻辑模块或软件。该资源预留方法包括S501-S502：
S501、第一终端设备接收来自第二终端设备的第一指示信息，第一指示信息用于指示第一时频资源，第一时频资源为第二终端设备预留的资源。
S502、第一终端设备根据以下一项或多项确定是否预留第一时频资源：第一参考信号接收功率以及已经预留第一时频资源的终端设备的数量。
本申请实施例提供的资源预留方法可以应用在终端设备采用mode 2进行SL通信的场景中。
本申请实施例中，如果在终端设备已经预留的时频资源的起始时域位置，终端设备对该时频 资源对应的信道进行的LBT还未完成(LBT计数器N的值还未等于0)，则可以称为LBT失败。
本申请实施例中，如果在终端设备已经预留的时频资源的起始时域位置之前，终端设备对该时频资源对应的信道进行的LBT已经完成(LBT计数器N的值已经等于0)，则可以称为LBT成功。
基于本申请实施例提供的资源预留方法，终端设备在预留资源时，可以根据第一参考信号接收功率和/或已经预留第一时频资源的终端设备的数量，判断是否预留第一时频资源，换言之，终端设备可以根据第一时频资源相关的条件，判断是否重复预留第一时频资源，从而可以在通过mode2进行资源选择的场景中，整体上提高系统中时频资源的利用率。进一步地，若本申请实施例提供的资源预留方法应用在非授权频段中，还可以降低在LBT失败，终端设备无法使用预留的时频资源的情况下，因为其他终端设备也不能使用预留的时频资源而造成的资源浪费。
以下对S501-S502进行展开介绍。
本申请实施例中，第一时频资源对应的信道，指的是频域资源与第一时频资源相同，或者频域资源包括第一时频资源的频域资源的信道/子信道，在此统一说明，其他时频资源对应的信道同理。
本申请实施例中，第一终端设备触发资源选择后，可以确定侦听窗以及资源选择窗，从而根据在侦听窗内侦听的结果，在资源选择窗中选择要预留的时频资源。其中，可选的，当第一终端设备需要发送数据，第一终端设备可以触发资源选择。
可选的，第一终端设备可以根据触发资源选择时的时域位置，确定侦听窗或者资源选择窗对应的时域资源。例如，第一终端设备在时隙n触发资源选择，第一终端设备确定的侦听窗的时域位置可以为其中，T0以及可以是根据相关配置信息确定的。第一终端设备确定的资源选择窗的时域位置可以为[n+T1,n+T2]，其中，T1和T2的选择基于第一终端设备的实现。
可选的，第一终端设备可以根据第一LBT完成时间点确定资源选择窗对应的时域资源。该实现方式中，第一LBT完成时间点是第一终端设备根据计数器N的值，计算出的LBT预计完成的时间点，不一定是LBT实际完成的时间点。假设第一终端设备从LBT计数器的值为N时开始侦听信道，直至计数器N＝0，LBT完成，第一终端设备侦听的信道一直是空闲的，则可以认为在这种情况下，第一终端设备根据LBT相关的配置信息计数器N的值计算得到的LBT时间就是实际完成LBT的时间；否则，若第一终端设备侦听的信道并非一直是空闲的，则第一终端设备根据LBT相关的配置信息计数器N的值计算得到的LBT时间不是实际完成LBT的时间。第一终端设备确定出第一LBT完成时间点后，将资源选择窗的起始时域位置设置为与第一LBT完成时间点相同或者设置在第一LBT完成时间点之后。
一种可能的实现方式中，第一终端设备可以根据LBT相关的配置信息，确定LBT计数器N的初始值，从而根据LBT触发时间以及计数器N的初始值，计算出计数器N＝0的时间点，即第一LBT完成时间点，具体地，第一终端设备假设从LBT触发时间开始对信道进行LBT，并从计数器N的初始值开始递减，计算出预计的计数器N＝0的时间点，将计算得到的计数器N＝0的时间点确定为第一LBT完成时间点。
其中，LBT相关的配置信息用于第一终端设备进行LBT，LBT相关的配置信息可以包括以下至少一项信息：p、CWp、CWmin,p和CWmax,p。本申请实施例中，p、CWp、CWmin,p和CWmax,p的释义可以参考上文对LBT的介绍，在此不再赘述。
其中，对于第一终端设备根据LBT触发时间以及计数器N的初始值，计算出计数器N＝0的时间点的具体实现，本申请实施例不作限制，以下介绍两种可能的计算计数器N＝0的时间点的方式。
一种可能的方式中，第一终端设备根据LBT触发时间以及计数器N的初始值，计算理想的计数器N＝0的时间点。其中，“理想的计数器N＝0的时间点”中的“理想的”，指第一终端设备假设从LBT触发时间开始侦听信道，计数器N开始工作，直至计数器N＝0，第一终端设备停止侦听，LBT完成，第一终端设备侦听的信道一直是空闲的，则可以认为在这种情况下，计算出的计数器N＝0的时间点为理想的计数器N＝0的时间点。例如，假设第一终端设备确定计数器N的初始值是6，且第一终端设备预设LBT过程中侦听信道一直是空闲的，那么第一终端设备可以以LBT触发时 间为起点，以第一个Td及之后连续的6个Tsl的时长为LBT过程时长，计算出第六个Tsl结束的时刻，并将第六个Tsl结束的时刻作为计数器N＝0的时间点。
或者，另一种可能的实现方式中，第一终端设备根据LBT触发时间以及计数器N的初始值，计算非理想的计数器N＝0的时间点。其中，“非理想的计数器N＝0的时间点”中的“非理想的”，指第一终端设备假设从LBT触发时间开始侦听信道，计数器N开始工作，直至计数器N＝0，第一终端设备停止侦听，LBT完成，第一终端设备侦听的信道并非一直是空闲的，则可以认为在这种情况下，计算出的计数器N＝0的时间点为非理想的LBT完成时间点。其中，可选的，第一终端设备可以预设LBT过程中侦听信道为繁忙的时间段，从而根据预设的信道繁忙的时间段，计算出计数器N＝0的时间点。例如，假设第一终端设备确定计数器N的初始值是6，且第一终端设备预设LBT过程中，第三个Tsl内侦听信道是繁忙的，其余Tsl内侦听信道是空闲的。那么，第一终端设备可以以LBT触发时间为起点，以第一个Td及之后连续的2个Tsl加上第二个Td及之后连续的4个Tsl的时长为LBT过程时长，计算出第六个Tsl结束的时刻，并将第六个Tsl结束的时刻作为计数器N＝0的时间点。
另一种可能的实现方式中，第一终端设备可以在执行LBT的过程中，根据当前时间点以及计数器N当前的值，计算出计数器N＝0的时间点。其中，第一终端设备根据当前时间点以及计数器N当前的值，计算计数器N＝0的时间点时，可以假设之后的LBT过程是理想的或者非理想的，具体可以参考上文介绍，在此不再赘述。
可选的，第一终端设备还可以对第一LBT完成时间点进行更新。具体地，在第一终端设备确定出一个第一LBT完成时间点之后，第一终端设备可以再次计算第一LBT完成时间点，并将之前的第一LBT完成时间点，更新为再次计算得到的第一LBT完成时间点。示例性的，第一终端设备根据LBT触发时间以及计数器N的初始值，确定了“理想的计数器N＝0的时间点”，并将理想的计数器N的0的时间点确定为第一LBT完成时间点。之后，第一终端设备在执行LBT的过程中，侦听到信道繁忙，因为之前的第一LBT完成时间点是“理想的计数器N＝0的时间点”，不可能是本次LBT实际完成的时间点，所以第一终端设备确定需要更新第一LBT完成时间点，第一终端设备根据当前的时间点以及计数器N当前的值，重新计算第一LBT完成时间点。
可选的，在资源选择窗的起始时域位置在第一LBT完成时间点之后的情况下，资源选择窗的起始时域位置与第一LBT完成时间点之间的间隔时长可以是预设的。例如，可以设置资源选择窗的起始时域位置所在的时隙是第一LBT完成时间点所在的时隙之后的第一个时隙，假设LBT第一完成时间点所在的时隙为时隙1，则资源选择窗的起始时域位置可以为时隙2的起始时域位置。
示例性的，图8为一种可能的情况中，第一终端设备根据第一LBT完成时间点，确定资源选择窗的起始时域位置的示意图。如图8所示，第一终端设备触发资源选择后，确定LBT计数器N＝0的时间点，并将资源选择窗的起始时域位置设置为与计数器N＝0的时间点相同。
可选的，若第一终端设备需要为多个不同TB进行资源预留，第一终端设备在确定资源选择窗时，第一终端设备可以根据多个不同TB分别对应的PDB值中，数值最小的PDB值确定资源选择窗的时域位置。具体地，第一终端设备可以根据多个不同TB分别对应的PDB值中，数值最小的PDB值确定T2。
可选的，第一终端设备可以根据获取的SL资源池配置信息确定资源选择窗对应的频域资源，具体地，第一终端设备可以将SL资源池配置信息所指示的频域资源集合，确定为资源选择窗对应的频域资源。
第一终端设备确定资源选择窗后，可以以一个或多个时隙作为时频资源的时域单位，以一个或多个子信道作为时频资源的频域单位，确定资源选择窗中的所有时频资源。或者，第一终端设备可以以一个TB作为时频资源的单位，确定资源选择窗中的所有时频资源。其中，第一终端设备确定资源选择窗中的所有时频资源，也可以称为第一终端设备初始化资源集合(可以记作□A)，包括资源选择窗中所有时频资源。
对于S501，若第二终端设备通过侦听等方式预留了第一时频资源，第二终端设备可以通过第一指示信息向其他终端设备指示该预留的第一时频资源的时频域位置。第一终端设备在侦听窗内接收到第二终端设备发送的第一指示信息后，第一终端设备可以根据第一指示信息，确定该指示 信息指示的第一时频资源已经被第二终端设备预留。其中，第二终端设备是不同于第一终端设备的其他终端设备，第二终端设备的数量可以为一个或多个，相对应的，第一指示信息的数量也可以为一个或多个。
可选的，第一指示信息可以直接指示第一时频资源的时频域位置，例如，第一指示信息可以指示第一时频资源的起始时域位置和结尾时域位置，以及指示第一时频资源的起始频域位置和结尾频域位置。或者，第一指示信息也可以间接指示第一时频资源的时域位置。例如，第一指示信息可以指示COT的起始时域位置以及COT的时长，从而第一终端设备可以根据COT的起始时域位置以及COT的时长，确定第一时频资源的时域资源。又例如，第一指示信息可以指示对第一时频资源进行LBT的LBT起始时域位置，LBT相关的配置信息以及COT的时长，从而第一终端设备可以根据LBT起始时域位置，以及LBT相关的配置信息确定COT的起始时域位置(即LBT完成时间点)，进而根据COT的起始时域位置以及COT的时长，确定第一时频资源的时域资源。
可选的，一个第一指示信息可以指示一个或多个第一时频资源。
可选的，第一指示信息可以承载于(或者说携带在)来自第二终端设备的第一级SCI、第二级SCI、侧行链路媒体接入控制控制元素(medium access control control element，MAC CE)或者PC5无线资源控制(radio resource control，RRC)信令中的至少一项信息。
可选的，第一指示信息承载于第一级SCI时，第一指示信息可以为第一级SCI中的Frequency resource assignment字段和Time resource assignment字段，其中，Frequency resource assignment字段可以指示第一时频资源的频域位置，Time resource assignment字段可以指示第一时频资源的时域位置。当然，第一指示信息也可以为第一级SCI中的其他字段，本申请实施例对此不作具体限制。
对于S502，第一终端设备确定第一时频资源是第二终端设备预留的时频资源后，可以根据预设条件确定是否预留第一时频资源，以下展开介绍。
可选的，第一时频资源是第一终端设备确定的资源选择窗内的时频资源。具体地，第一终端设备可以根据第一时频资源的时频域位置，确定第一时频资源是否位于资源选择窗内。如果第一时频资源在资源选择窗内，则第一终端设备可以根据下文介绍的条件，进一步确定是否预留第一时频资源。
第一终端设备可以根据以下一项或多项确定是否预留第一时频资源：第一参考信号接收功率以及已经预留第一时频资源的终端设备的数量，可以理解的是，第一参考信号接收功率和/或已经预留第一时频资源的终端设备的数量，也可以称为第一终端设备判断是否预留第一时频资源的条件。当满足上述一个或多个条件，则第一终端设备预留第一时频资源，此时，可以理解第一时频资源将被第一终端设备和第二终端设备都预留，即第一时频资源被重复预留第。当不满足上述所有条件，第一终端设备不预留第一时频资源。
下面将对上述条件分别进行说明：
第一参考信号接收功率为第一指示信息对应的PSCCH或PSSCH的DMRS的RSRP测量结果。其中，在第一指示信息承载在PSCCH上的情况下，第一参考信号接收功率为PSCCH上的DMRS的RSRP测量结果，示例性的，该情况下第一指示信息可以携带在第一级SCI中。在第一指示信息承载在PSSCH上的情况下，第一参考信号接收功率为PSSCH上的DMRS的RSRP测量结果。具体地，第一终端设备测量承载第一指示信息的PSCCH或PSSCH上，用于承载DMRS的所有资源元素(resource elements，RE)上接收到的信号功率，得到的所有测量结果的平均值即是第一参考信号接收功率。
已经预留第一时频资源的终端设备的数量是指，向第一终端设备发送指示第一时频资源的第一指示信息的终端设备的数量。
以下对第一终端设备如何根据第一参考信号接收功率和/或已经预留第一时频资源的终端设备的数量，确定是否预留第一时频资源进行介绍。
对于第一终端设备可以根据第一参考信号接收功率确定是否预留第一时频资源的情况，可选的，第一终端设备可以在第一参考信号接收功率低于第一功率门限的情况下，确定可以预留第一时频资源。或者，第一终端设备可以在第一参考信号接收功率低于第二功率门限且高于第三功率 门限的情况下，确定可以预留第一时频资源。
可选的，第一功率门限，第二功率门限或者第三功率门限可以根据信道繁忙比率(channel busy ratio，CBR)，信道占用比率(channel occupancy ratio，CR)和对信道侦听为繁忙的次数中的一项或多项信息确定的。其中，CBR和/或CR可以是对第一时频资源对应的信道进行侦听确定的。
本申请实施例中，当CBR、CR的数值越小或者对信道侦听为繁忙的次数越低，第一功率门限，第二功率门限或者第三功率门限越低，反之越高，其具体的确定方式可以根据实际需求设置。
或者，第一功率门限或第二功率门限也可以根据第一终端设备的待发送数据的优先级prioTX以及第一指示信息所指示的优先级prioRX确定。具体可以参考本申请对mode 2的描述中，终端设备选择时频资源时，RSRP门限值的确定方式。
基于本方案，第一终端设备可以根据第一参考信号接收功率与预设门限的大小关系，确定是否预留第一时频资源。具体地，如果第一参考信号接收功率高于预设门限，则说明第一终端设备和第二终端设备的距离较近，两者的LBT结果大概率相同，大概率不会出现因为LBT失败的一方已经预留第一时频资源，导致LBT成功的一方无法使用第一时频资源的问题，即大概率不会出现因为LBT失败导致的资源浪费问题，因此第一时频资源不需要重复预约第一时频资源。反之，如果第一参考信号接收功率低于预设门限，则说明第一终端设备和第二终端设备的LBT结果很可能不同，可能出现因为LBT失败的一方已经预留第一时频资源，导致LBT成功的一方无法使用第一时频资源的问题，因此第一终端设备可以重复预留第一时频资源，在已经预留第一时频资源的第二终端设备LBT失败的情况下，若第一终端设备LBT成功，第一时频资源还可以被第一终端设备使用，提高了时频资源的整体利用率。
对于第一终端设备可以根据已经预留第一时频资源的终端设备的数量确定是否预留第一时频资源的情况，第一终端设备可以在已经预留第一时频资源的终端设备的数量低于第一门限的情况下，确定可以预留第一时频资源。其中，第一终端设备可以根据来自其他终端设备的，指示第一时频资源的时频域位置的指示信息(例如第一指示信息)，确定已经预留第一时频域资源的终端设备的数量。
可选的，通常一个终端设备通过一条第一指示信息向第一终端设备指示预留的第一时频资源，因此，可以理解的是，第一终端设备也可以根据第一指示信息的数量，确定是否预留第一时频资源。第一终端设备可以在第一指示信息的数量低于第一门限的情况下，确定可以预留第一时频资源。
可选的，第一门限可以根据CBR，CR和对信道侦听为繁忙的次数中的一项或多项信息确定。本申请实施例中，当CBR、CR的数值越小或者对信道侦听为繁忙的次数越低，第一门限越低，反之越高，其具体的确定方式可以根据实际需求设置。
基于本方案，第一终端设备可以已经预留第一时频资源的终端设备的数量，确定是否预留第一时频资源。具体地，如果已经预留第一时频资源的终端设备的数量高于预设门限，则说明很多终端设备都重复预留了第一时频资源，在这种情况下，如果第一终端设备依然重复预留第一时频资源，很可能无法成功占用第一时频资源发送数据，导致业务数据延迟。反之，如果已经预留第一时频资源的终端设备的数量低于预设门限，则说明重复预留第一时频资源的终端设备的数量不会太多，第一终端设备重复预留第一时频资源后，有可能成功占用第一时频资源来发送数据。
对于第一终端设备可以结合第一参考信号接收功率以及已经预留第一时频资源的终端设备的数量确定是否预留第一时频资源的情况，可选的，第一终端设备可以在第一参考信号接收功率低于第一功率门限，且已经预留第一时频资源的终端设备的数量低于第一门限的情况下，确定可以预留第一时频资源。或者，第一终端设备可以在第一参考信号接收功率低于第二功率门限且高于第三功率门限，并且已经预留第一时频资源的终端设备的数量低于第一门限的情况下，确定可以预留第一时频资源。具体可以参考上文介绍，在此不再赘述。
上文介绍了第一终端设备根据与第一参考信号接收功率和/或已经预留第一时频资源的终端设备的数量相关的条件，确定第一终端设备是否预留第一时频资源。可以理解的是，如果第一时频资源不满足上述与第一参考信号接收功率和/或已经预留第一时频资源的终端设备的数量中的所有条件，则第一终端设备确定不预留第一时频资源，或者说，第一终端设备排除第一时频资源。 例如，在第一参考信号接收功率高于第一功率门限的情况下，第一终端设备可以确定排除第一时频资源。该情况中，可以认为第一终端设备与第二终端设备的距离较近，两者的LBT成功或失败的结果大概率相同，不需要实现重复预留。
进一步地，第一终端设备还可以结合第一LBT完成时间点，以及上文介绍的与第一参考信号接收功率和/或已经预留第一时频资源的终端设备的数量相关的条件，共同确定是否预留第一时频资源。具体地，如果第一时频资源的起始时域位置与第一LBT完成时间点相同或在第一LBT完成时间点之后，且第一时频资源满足上文介绍的与第一参考信号接收功率和/或已经预留第一时频资源的终端设备的数量相关的条件，则第一终端设备确定预留第一时频资源。如果第一时频资源的起始时域位置在第一LBT完成时间点之前，和/或，第一时频资源不满足上文介绍的与第一参考信号接收功率和/或已经预留第一时频资源的终端设备的数量相关的条件，则第一终端设备确定不预留第一时频资源。
可选的，若第一终端设备需要为多个不同TB进行资源预留，多个不同TB分别对应的优先级prioTX需要相同，并且用于传输不同TB的不同资源的子信道数LsubCH需要相同。其中，TB为重传资源和/或新传资源。
本申请实施例中，第一终端设备确定预留第一时频资源后，会向其他终端设备发送指示第一时频资源的时频域位置的指示信息，从而告知其他终端设备，第一终端设备已经预留第一时频资源。
基于本申请实施例提供的资源预留方法，终端设备在预留资源时，可以根据第一参考信号接收功率和/或已经预留第一时频资源的终端设备的数量，判断是否重复预留第一时频资源，从而实现在通过mode2进行资源选择的场景中，如果有终端设备预留了时频资源但LBT失败，该预留的时频资源依然可以被其他重复预留该时频资源且LBT成功的终端设备使用，从而整体上提高系统中时频资源的利用率，降低在终端设备无法使用预留的时频资源的情况下，因为其他终端设备也不能使用预留的时频资源而造成的资源浪费。
如图9所示，为本申请实施例提供的另一种资源预留方法。图9中以终端设备作为该示意的执行主体为例来示意该方法，但本申请并不限制该示意的执行主体。例如，图9中的终端设备也可以是支持该终端设备实现该方法的芯片、芯片系统、或处理器，还可以是能实现全部或部分应用功能网元功能的逻辑模块或软件。该资源预留方法包括S701-S702：
S701、第一终端设备根据LBT计数器的值确定第一LBT完成时间点。
S702、第一终端设备根据第一LBT完成时间点，在资源选择窗内预留第一时频资源和/或确定是否进行资源重选。
基于本申请实施例提供的资源预留方法，终端设备可以先确定LBT完成时间点，在预留资源时，终端设备可以根据LBT完成时间点预留时频资源，避免因为LBT未完成，导致无法使用预留的时频资源。或者，终端设备可以根据LBT完成时间点判断是否进行资源重选，可以在因为LBT未完成导致无法使用预留的时频资源的情况下，使用重选的资源发送数据。
需要说明的是，本申请实施例图9的实施例可以和图7的实施例相互结合。
对于S701，第一终端设备根据LBT计数器的值确定第一LBT完成时间点的具体实现，可以参考上文对S501的介绍，在此不再赘述。
对于S702，可选的，第一终端设备可以根据第一LBT完成时间点，在资源选择窗内预留第一时频资源，具体地，第一终端设备在资源选择窗内预留起始时域位置在第一LBT完成时间点之后的时频资源。
可选的，第一终端设备在资源选择窗内预留第一时频资源时，可以进一步结合第一参考信号接收功率和/或已经预留第一时频资源的终端设备的数量，确定是否预留第一时频资源，其具体实现可以参考上文对S502的介绍中，第一终端设备如何第一参考信号接收功率和/或已经预留第一时频资源的终端设备的数量，确定是否预留第一时频资源。
或者，第一终端设备在资源选择窗内预留第一时频资源时，也可以进一步结合现有协议中，终端设备在资源选择窗内预留时频资源的方式，本申请实施例对此不作具体限制。
对于S702，可选的，第一终端设备可以根据第一LBT完成时间点，判断是否需要对已经预 留的第一时频资源进行资源重选。
具体地，如果第一时频资源的起始时域位置在第一LBT完成时间点之后，则不需要进行资源重选，第一终端设备可以使用第一时频资源进行数据传输。如果第一时频资源的起始时域位置在第一LBT完成时间点之前，则可以认为无法在LBT完成之后使用第一时频资源，需要进行资源重选。其中，第一LBT完成时间点具体可以参考上文对S501-S502中第一LBT完成时间点的介绍，在此不再赘述。条件1：第二时频资源的起始时域位置与LBT完成时间点相同或者在LBT完成时间点之后。
如果存在第二时频资源满足上述条件1，第一终端设备可以进一步判断该第二时频资源是否满足以下条件2-5，如果第二时频资源满足以下条件2-5中的至少一项，则第一终端设备可以选择该第二时频资源用于发送数据。
条件2：第二时频资源没有被其他终端设备预留。
条件3：在第二时频资源已经被其他终端设备(以第二终端设备为例)预留的情况下，第二参考信号接收功率低于第二门限。其中，第二参考信号接收功率为第二指示信息对应的PSSCH或者PSCCH的DMRS的RSRP测量结果。第二指示信息为第二终端设备发送的指示第二时频资源的时频域位置的信息，具体可以参考第一指示信息。第二门限是根据第二指示信息指示的优先级prioRX，以及第一终端设备待发送的数据的prioTX确定的RSRP门限值，具体可以参考现有的mode2中，终端设备选择时频资源时，RSRP门限值的确定方式。
条件4：在第二时频资源已经被其他终端设备预留的情况下，第二参考信号接收功率低于第一功率门限。或者，第二参考信号接收功率低于第二功率门限且高于第三功率门限。其中，第一功率门限、第二功率门限或者第三功率门限可以根据CBR，CR和对信道侦听为繁忙的次数中的一项或多项信息确定。
条件5：在第二时频资源已经被其他终端设备预留的情况下，已经预留第二时频资源的终端设备的数量低于第一门限。
可选的，第一终端设备重选的第二时频资源的大小(时域资源大小和频域资源大小)可以与第一时频资源的大小一致。例如，第一时频资源时域上占用1个时隙，频域上占用1子信道，第一终端设备在重选资源时，也选择时域上占用1个时隙，频域上占用1子信道作为重选的第二时频资源。
示例性的，以下结合附图对本申请实施例中，第一终端设备如何重选第二时频资源进行介绍。如图10所示，第一时频资源中有部分时频资源因为在LBT完成时间点(LBT计数器N＝0的时间点)之前，导致这部分时频资源不能接入，触发第一终端设备重选时频资源。第一终端设备重新选择起始时域位置在N＝0的时间点之后，且大小与第一时频资源大小一致的第二时频资源。又例如，如图11所示，第一时频资源全部都在LBT完成时间点(LBT计数器N＝0的时间点)之前，导致第一终端设备不能接入第一时频资源，触发第一终端设备重选资源。第一终端设备以N＝0的时间点为起始时域位置，重新选择大小与第一时频资源大小一致的第二时频资源。
可选的，本申请实施例提供的资源预留方法还可以包括S503：
S503、第一终端设备进行LBT。
本申请实施例中，第一终端设备可以对选择的时频资源(可以为预留的第一时频资源或者重选的第二时频资源)对应的信道进行LBT，并根据LBT的结果确定是否可以接入对应的信道，即确定是否可以使用预留的时频资源来传输数据。可选的，第一终端设备可以在选择时频资源后，对选择的时频资源对应的信道进行LBT，或者，第一终端设备也可以先对资源选择窗包括的每个时频资源对应的信道进行LBT，再在资源选择窗内选择时频资源，本申请实施例对此不作限制。
以下将LBT实际完成的时间点，即实际上计数器N＝0的时间点称为第二LBT完成时间点，根据不同的LBT情况，对选择的时频资源能否使用进行展开介绍。
如果选择的时频资源时域上全部在第二LBT完成时间点之后，第一终端设备可以使用选择的时频资源来传输数据。
如果选择的时频资源中，部分时频资源时域上在第二LBT完成时间点之前，第一终端设备可以使用选择的时频资源中，时域上在第二LBT完成时间点之后的部分时频资源(可以认为这部分 时频资源LBT成功)来传输数据，或者，第一终端设备也可以放弃选择的时频资源。
如果选择的时频资源时域上全部在第二LBT完成时间点之前，第一终端设备可以放弃选择的时频资源。
可选的，如果第一终端设备放弃选择的时频资源，第一终端设备还可以进行资源重选。
在第一终端设备选择的时频资源的起始时域位置在第二LBT完成时间点之后，第一终端设备可以使用选择的时频资源来传输数据的情况下，因为第一终端设备选择的时频资源可能被其他终端设备预留，若第一终端设备和其他终端设备同时在选择的时频资源上发送数据，会造成资源冲突的问题。为了解决多个终端设备同时接入重复预留的时频资源导致的资源冲突问题，以下以第一终端设备选择的时频资源是第一终端设备预留的第一时频资源为例，介绍本申请实施例提供的避免资源冲突的方案：
第一终端设备确定时域上的一个时间点(以下将该时间点称为第一接入点)，具体地，第一接入点在第一时频资源的起始时域位置之前，且第一接入点与第一时频资源的起始时域位置之间间隔第一预设时长。第一终端设备确定第一接入点后，从第一接入点开始，接入第一时频资源对应的信道，从而占用第一时频资源。其中，第一预设时长可以是预配置的，高层配置的，根据第一终端设备待发送数据(也可以称为第一终端设备的业务数据)的优先级确定的，或者随机确定的。
可以理解的是，上述避免资源冲突的方案，在第一终端设备选择第二时频资源来传输数据，第二时频资源LBT成功的情况下，将第一时频资源替换为第二时频资源同样适用。
基于本方案，当不同的终端设备重复选择了相同的时频资源，不同的终端设备可以根据不同的接入点尝试接入该时频资源对应的信道，先接入信道的终端设备可以屏蔽其他终端设备，抢先使用该时频资源传输数据，从而避免了资源冲突。
可选的，第一预设时长可以以9μs为粒度。例如，第一预设时长可以配置为5个9μs，第一时频资源的起始时域位置可以为时隙1的起始时间点，第一终端设备可以根据第一预设时长和第一时频资源的起始时域位置，确定第一接入点为时隙1的起始时间点之前45μs，从而通过第一接入点接入第一时频资源对应的信道。
示例性的，假设第一终端设备和第二终端设备均预留了第一时频资源，且均成功完成LBT。第一终端设备和第二终端设备根据各自的第一接入点尝试接入第一时频资源对应的信道的示意图可以如图12所示。其中，第一终端设备预配置的第一预设时长为6个9μs，即54μs，第二终端设备预配置的第一预设时长为4个9μs，即36μs。第一时频资源的起始时域位置为时隙2的起始时间点，第一时频资源前一个时隙为时隙1。第一终端设备在第一时频资源的起始时域位置之前54μs对应的时间点(第一终端设备的第一接入点)开始接入第一时频资源对应的信道，第二终端设备在第一时频资源的起始时域位置之前36μs对应的时间点(第二终端设备的第一接入点)开始接入第一时频资源对应的信道，因为第一终端设备开始接入的时间点早于第二终端设备开始接入的时间点，第一终端设备可以先接入第一时频资源对应的信道，从而可以抢先使用第一时频资源传输数据，避免了资源冲突。
可选的，在第一预设时长是根据第一终端设备待发送数据的优先级确定的情况下，第一预设时长可以与待发送数据的优先级呈正比关系，即待发送数据的优先级越高，第一预设时长越长，则第一接入点相比第一时频资源的起始时域位置越早。换言之，在第一终端设备和第二终端设备均预留了第一时频资源，且均成功完成LBT的情况下，若第一终端设备的业务数据的优先级高于第二终端设备的业务数据的优先级，因为第一终端设备的第一接入点早于第二终端设备的第一接入点，第一终端设备可以先于第二终端设备接入第一时频资源对应的信道，即第一终端设备可以先占用第一时频资源，抢先在第一时频资源上发送业务数据。
上文介绍了mode 2的资源预留场景中，终端设备如何基于LBT，判断是否重复预留第一时频资源。可以理解的是，在第一时频资源对应单信道的情况下，第一终端设备可以基于第一时频资源，实现单信道接入。进一步地，在单信道接入的基础上，本申请实施例还进一步考虑了mode 2的资源预留场景中，如何基于LBT实现多信道接入。以下对该资源预留方法进行展开介绍。
在多信道接入的场景中，资源选择窗对应的频域资源，可以由多个信道组成，其中每个信道 需要分别进行LBT。
首先，第一终端设备在资源选择窗中预留多个第一时频资源。
具体地，第一终端设备的MAC层根据业务需求确定需要预留的第一时频资源的数量，并向物理层发送用于确定需要预留的第一时频资源的指示信息。
可选的，第一终端设备的MAC层向物理层指示需要预留的第一时频资源的资源数量(也可以理解为需要进行LBT的多个信道对应的interlace总数量)、需要进行LBT的多个信道分别对应的interlace数量和信道指示信息。或者，第一终端设备的MAC层向物理层指示需要预留的第一时频资源的资源数量和需要进行LBT的多个信道分别对应的interlace数量。或者，第一终端设备的MAC层向物理层指示需要预留的第一时频资源的资源数量和信道指示信息。或者，第一终端设备的MAC层向物理层指示需要进行LBT的多个信道分别对应的interlace数量和信道指示信息。或者，第一终端设备的MAC层向物理层指示需要预留的第一时频资源的资源数量。
其中，信道指示信息可以包括需要进行LBT的信道的数量，或者，可以包括信道的具体信息，信道的具体信息用于指示需要进行LBT的信道。如果MAC层向物理层指示的信道指示信息包括需要进行LBT的信道的数量，则由物理层确定要接入或选择信道的具体信息，并向MAC层上报所确定的信道的具体信息。如果MAC层仅向物理层指示需要预留的第一时频资源的资源数量，则由物理层确定要接入或选择信道(即需要进行LBT的信道)的具体信息和分别对应的interlace数量，并向MAC层上报所确定的信道的具体信息和/或分别对应的interlace数量。如果MAC层向物理层指示需要预留的第一时频资源的资源数量和interlace数量，则由物理层确定要接入或选择信道的具体信息，并向MAC层上报所确定的信道的具体信息。
可选的，物理层和MAC层之间也可以不交互信道指示信息，而是由LBT过程确定信道指示信息，可以理解为LBT过程确定了信道的数量，或者，每个信道的具体信息。
其中，信道指示信息指示的信道的数量可以为第一终端设备确定的需要进行LBT的信道的数量。
第一终端设备确定需要预留的第一时频资源的数量后，第一终端设备可以在资源选择窗内预留满足以下条件中至少一项条件的多个第一时频资源。其中，预留的多个第一时频资源，分别与需要进行LBT的多个信道对应。
条件6：第一时频资源的第一参考信号功率低于第一功率门限。或者，第一时频资源的第一参考信号功率低于第二功率门限且高于第三功率门限。条件6的具体实现可以参考上文对S502的介绍，在此不再赘述。
条件7：已经预留第一时频资源的终端设备的数量低于第一门限。条件7的具体实现可以参考上文对S502的介绍，在此不再赘述。
条件8：资源选择窗内，若某个信道对应的时频资源中，可用资源不小于Y％，则第一终端设备可以在该信道对应的可用资源内选择要预留的第一时频资源。可选的，第一终端设备可以在某个信道对应的可用资源内，随机选择第一时频资源，或者，也可以在某个信道对应的可用资源内，选择满足上述条件6和/或条件7的第一时频资源，或者，也可以在某个信道对应的可用资源内根据其他条件选择第一时频资源，本申请对此不作具体限制。条件8中，如何确定某个信道对应的可用资源是否不小于Y％，可以参考现有的mode2场景中，如何在SA内排除时频资源直至SA中剩余的资源(其中，SA可用资源可以称为资源选择窗内的可用资源)不小于资源选择窗总资源的X％的介绍。其中，Y的数值的确定方式可以与X的数值的确定方式相当，或者，也可以通过其他方式确定Y的数值，例如，Y的数值可以通过信道对应的待发送数据的优先级确定，本申请实施例对此不作限制。
条件9：从资源选择窗内排除接收的第一级SCI对应的PSSCH或PSCCH的DMRS的RSRP测量结果高于对应的RSRP门限值的时频资源后，第一终端设备可以在剩余的时频资源内选择多个第一时频资源。具体可以参考上文对现有的mode2场景中，设备如何在资源选择窗内排除时频资源的介绍，在此不再赘述。
进一步地，第一终端设备在资源选择窗内预留多个第一时频资源时，还可以根据多个需要进行LBT的信道分别对应的第一LBT完成时间点，选择起始时域位置与对应的第一LBT完成时间 点相同或者起始时域位置在对应的第一LBT完成时间点之后的第一时频资源。具体可以参考上文对S501-S502中，第一终端设备根据第一LBT完成时间点，确定是否预留第一时频资源的介绍，在此不再赘述。
可选的，为了满足多信道的接入时间相同，第一终端设备可以预留多个起始时域位置相同的第一时频资源。
示例性的，如图13所示，假设第一终端设备通过Type B类型的多信道接入流程，接入信道1、信道2和信道3。其中，信道1、信道2和信道3的LBT过程维护同一个CWp，第一终端设备可以通过Type 1类型的LBT流程接入信道2，对于信道1和信道3，第一终端设备在接入信道2前对信道1和信道3侦听25μs时长。第一终端设备根据信道2对应的LBT相关配置信息，确定信道2对应的第一LBT完成时间点，并预留起始时域位置与第一LBT完成时间点相同或之后的时频资源1、时频资源2和时频资源3(图13中示出的是起始时域位置与第一LBT完成时间点相同)。其中，时频资源1、时频资源2和时频资源3的起始时域位置相同。
可选的，若第一终端设备已知需要接入的多个信道中，某些信道无法同时接入，例如某些信道对应的时频资源已被其他终端设备预留，或者用于对某些信道进行LBT的计数器N的初始值不同，那么第一终端设备可以在预留需要接入的多个信道分别对应的第一时频资源时，直接预留用于后续发送数据的第一时频资源。示例性的，如图14所示，假设第一终端设备确定需要预留三个时频资源，分别对应信道1、信道2和信道3，第一终端设备确定基于Type 1类型的LBT流程接入信道1、信道2和信道3。其中，信道2和信道3对应的LBT计数器N的初始值相同，信道1对应的LBT计数器N的初始值不同。若第一终端设备确定信道1、信道2和信道3对应的LBT的开始时间相同，信道2和信道3分别对应的第一LBT完成时间点相同，信道1对应的第一LBT完成时间点在信道2和信道3对应的第一LBT完成时间点之后，第一终端设备无法同时接入信道1、信道2和信道3，因为第一终端设备在接入信道2和信道3发送数据时，无法保持对信道1的侦听，第一终端设备需要暂停信道1的LBT流程。所以，第一终端设备可以预留起始时域位置在信道2对应的第一LBT完成时间点之后的时频资源2，以及起始时域位置与时频资源2的起始时域位置相同的时频资源3，并预留起始时域位置与时频资源2和时频资源3的结尾时域位置距离一段预设时长的时频资源1，以实现可以成功完成对信道1、信道2和信道3的LBT，接入信道1、信道2和信道3来使用时频资源1、时频资源2和时频资源3。其中，如图14所示，一段预设时长可以为4*9μs加上暂停信道1的LBT流程后，剩余的LBT时长。或者，一段预设时长可以为重新初始化信道1的LBT流程后，预计的对信道1进行LBT的时长(图14中未示出)。
可选的，第一终端设备预留多个第一时频资源后，在不同的情况下，第一终端设备基于LBT流程接入第一时频资源的流程也不同。以下结合不同情况，进行展开介绍。
情况一：在对多个第一时频资源对应的信道分别进行LBT的过程(也可以称为多信道接入的过程)中，如果至少一个信道的LBT失败，就重新初始化所有第一时频资源对应的信道接入流程，即重新开始对所有第一时频资源对应的信道分别进行LBT。
进一步的，为了避免因为LBT失败导致第一时频资源的起始时域位置在对应的第二LBT完成时间点之前，第一终端设备无法使用第一时频资源，至少一个信道的LBT失败还可以触发对所有进行LBT的信道进行资源重选，第一终端设备计算多个第一时频资源分别对应的信道对应的第一LBT完成时间点，并重新选择多个起始时域位置在对应的第一LBT完成时间点之后的第二时频资源。可选的，重选的第二时频资源的大小与对应的第一时频资源的大小相同。
情况二：在多信道接入的过程中，任何信道的LBT失败不影响其他信道的LBT过程。
一种可能的实现中，对于LBT失败的信道，如果第一终端设备是基于Type 1类型的LBT流程接入信道，LBT失败后，第一终端设备在等待4*Tsl后，如果再在Td内侦听信道为空闲状态则可以继续进行LBT，即继续递减LBT计数器N。或者，第一终端设备可以重新初始化信道接入流程，重新对信道进行LBT。
进一步的，至少一个信道的LBT失败还可以触发对LBT失败的信道进行资源重选，第一终端设备计算LBT失败的信道对应的第一LBT完成时间点，并重新选择起始时域位置在对应的第一LBT完成时间点之后的第二时频资源。可选的，重选的第二时频资源的大小与对应的第一时频 资源的大小相同。
可选的，在某一信道的LBT成功的情况下，第一终端设备在对应的第一时频资源上发送数据时，可以预留用于再次接入该信道的第三时频资源。可选的，第三时频资源的大小可以与对应的第一时频资源的大小相同。
情况三：在多信道接入的过程中，对于部分信道，这部分信道中有至少一个信道的LBT失败，就重新初始化所有第一时频资源对应的信道接入流程，并触发资源重选。对于另一部分信道，这部分信道中，任何信道的LBT失败不影响其余信道的LBT过程，仅对于LBT失败的信道进行资源重选，重新选择第二时频资源。
可选的，第一终端设备还可以在距离第一时频资源的起始时域位置一段预设时长之前，分别对第一时频资源进行资源重评估，如果第一时频资源的资源重评估没有通过，则重新选择对应的第二时频资源。示例性的，假设某个第一时频资源时域上占用时隙m，第一终端设备可以在时隙m-T3时刻进行资源重评估。该实现方式中的具体实现可以参考上文对S501-S502的介绍，在此不再赘述。
可以理解的是，以上各个实施例中，由第一终端设备实现的方法和/或步骤，也可以由可用于第一终端设备的部件(例如芯片或者电路)实现。
上述主要从各个设备之间交互的角度对本申请实施例提供的方案进行了介绍。相应的，本申请实施例还提供了通信装置，该通信装置用于实现上述各种方法。该通信装置可以为上述方法实施例中的第一终端设备，或者包含上述第一终端设备的装置，或者为可用于第一终端设备的部件。可以理解的是，该通信装置为了实现上述功能，其包含了执行各个功能相应的硬件结构和/或软件模块。本领域技术人员应该很容易意识到，结合本文中所公开的实施例描述的各示例的单元及算法步骤，本申请能够以硬件或硬件和计算机软件的结合形式来实现。某个功能究竟以硬件还是计算机软件驱动硬件的方式来执行，取决于技术方案的特定应用和设计约束条件。专业技术人员可以对每个特定的应用来使用不同方法来实现所描述的功能，但是这种实现不应认为超出本申请的范围。
本申请实施例可以根据上述方法实施例中对通信装置进行功能模块的划分，例如，可以对应各个功能划分各个功能模块，也可以将两个或两个以上的功能集成在一个处理模块中。上述集成的模块既可以采用硬件的形式实现，也可以采用软件功能模块的形式实现。需要说明的是，本申请实施例中对模块的划分是示意性的，仅仅为一种逻辑功能划分，实际实现时可以有另外的划分方式。
以通信装置为上述方法实施例中的第一终端设备为例，图15示出了一种通信装置1300的结构示意图。该通信装置1300包括接口模块1301和处理模块1302。所述接口模块1301，也可以称为收发模块或收发单元，接口模块1301用以实现收发功能，例如可以是收发电路，收发机，收发器或者通信接口。
在一种可能的设计中，接口模块1301，用于接收来自第二终端设备的第一指示信息，第一指示信息用于指示第一时频资源，第一时频资源为第二终端设备预留的资源；
处理模块1302，用于根据以下一项或多项确定是否预留第一时频资源：第一参考信号接收功率以及已经预留第一时频资源的终端设备的数量；第一参考信号接收功率为第一指示信息对应的物理侧行链路控制信道或物理侧行链路共享信道的参考信号接收功率。
在本实施例中，该通信装置1300以采用集成的方式划分各个功能模块的形式来呈现。这里的“模块”可以指特定ASIC，电路，执行一个或多个软件或固件程序的处理器和存储器，集成逻辑电路，和/或其他可以提供上述功能的器件。
在一个简单的实施例中，本领域的技术人员可以想到该通信装置1300可以采用图6所示的通信装置400的形式。
比如，图6所示的终端设备中的处理器401可以通过调用存储器403中存储的计算机执行指令，使得通信装置400执行上述方法实施例中的资源预留方法。具体的，图13中的接口模块1301和处理模块1302的功能/实现过程可以通过图6所示的通信装置400中的处理器401调用存储器403中存储的计算机执行指令来实现。或者，图15中的处理模块1302的功能/实现过程可以通过 图4所示的终端设备中的处理器401调用存储器403中存储的计算机执行指令来实现，图15中的接口模块1301的功能/实现过程可以通过图6所示的通信装置400中的通信接口404来实现。
由于本实施例提供的通信装置1300可执行上述资源预留方法，因此其所能获得的技术效果可参考上述方法实施例，在此不再赘述。
图16示出了另一种通信装置1400的结构示意图。该通信装置1400包括处理模块1401。
在一种可能的设计中，处理模块1401，用于根据LBT计数器N的值，确定第一LBT完成时间点。处理模块1401，还用于根据第一LBT完成时间点，在资源选择窗内预留第一时频资源和/或确定是否进行资源重选。
在本实施例中，该通信装置1400以采用集成的方式划分各个功能模块的形式来呈现。这里的“模块”可以指特定ASIC，电路，执行一个或多个软件或固件程序的处理器和存储器，集成逻辑电路，和/或其他可以提供上述功能的器件。
在一个简单的实施例中，本领域的技术人员可以想到该通信装置1400可以采用图4所示的通信装置400的形式。
比如，图6所示的终端设备中的处理器401可以通过调用存储器403中存储的计算机执行指令，使得通信装置400执行上述方法实施例中的资源预留方法。具体的，图16中的处理模块1401的功能/实现过程可以通过图6所示的通信装置400中的处理器401调用存储器403中存储的计算机执行指令来实现。
由于本实施例提供的通信装置1400可执行上述资源预留方法，因此其所能获得的技术效果可参考上述方法实施例，在此不再赘述。
需要说明的是，以上模块或单元的一个或多个可以软件、硬件或二者结合来实现。当以上任一模块或单元以软件实现的时候，所述软件以计算机程序指令的方式存在，并被存储在存储器中，处理器可以用于执行所述程序指令并实现以上方法流程。该处理器可以内置于SoC(片上系统)或ASIC，也可是一个独立的半导体芯片。该处理器内处理用于执行软件指令以进行运算或处理的核外，还可进一步包括必要的硬件加速器，如现场可编程门阵列(field programmable gate array，FPGA)、可编程逻辑器件(programmable logic device，PLD)、或者实现专用逻辑运算的逻辑电路。
当以上模块或单元以硬件实现的时候，该硬件可以是CPU、微处理器、DSP芯片、微控制单元(microcontroller unit，MCU)、人工智能处理器、ASIC、SoC、FPGA、PLD、专用数字电路、硬件加速器或非集成的分立器件中的任一个或任一组合，其可以运行必要的软件或不依赖于软件以执行以上方法流程。
可选的，本申请实施例还提供了一种芯片系统，包括：至少一个处理器和接口，该至少一个处理器通过接口与存储器耦合，当该至少一个处理器执行存储器中的计算机程序或指令时，使得上述任一方法实施例中的方法被执行。在一种可能的实现方式中，该通信装置还包括存储器。可选的，该芯片系统可以由芯片构成，也可以包含芯片和其他分立器件，本申请实施例对此不作具体限定。
在上述实施例中，可以全部或部分地通过软件、硬件、固件或者其任意组合来实现。当使用软件程序实现时，可以全部或部分地以计算机程序产品的形式来实现。
本申请提供一种计算机程序产品包括一个或多个计算机指令，当其在通信装置上运行时，使得本申请实施例的任一方法被执行。
在计算机上加载和执行计算机程序指令时，全部或部分地产生按照本申请实施例所述的流程或功能。所述计算机可以是通用计算机、专用计算机、计算机网络、或者其他可编程装置。
计算机指令可以存储在计算机可读存储介质中。本申请实施例提供了一种计算机可读存储介质，该计算机可读存储介质中存储有指令，当其在通信装置上运行时，使得本申请实施例的任一方法被执行。
计算机指令可以从一个计算机可读存储介质向另一个计算机可读存储介质传输，例如，所述计算机指令可以从一个网站站点、计算机、服务器或者数据中心通过有线(例如同轴电缆、光纤、数字用户线(digital subscriber line，DSL))或无线(例如红外、无线、微波等)方式向另一个 网站站点、计算机、服务器或数据中心进行传输。计算机可读存储介质可以是计算机能够存取的任何可用介质或者是包含一个或多个可以用介质集成的服务器、数据中心等数据存储设备。可用介质可以是磁性介质(例如，软盘、硬盘、磁带)，光介质[例如，数字通用光盘(digital versatile disc，DVD)]、或者半导体介质(例如固态硬盘(solid state drive，SSD))等。
尽管在此结合各实施例对本申请进行了描述，然而，在实施所要求保护的本申请过程中，本领域技术人员通过查看所述附图、公开内容、以及所附权利要求书，可理解并实现所述公开实施例的其他变化。在权利要求中，“包括”(comprising)一词不排除其他组成部分或步骤，“一”或“一个”不排除多个的情况。单个处理器或其他单元可以实现权利要求中列举的若干项功能。相互不同的从属权利要求中记载了某些措施，但这并不表示这些措施不能组合起来产生良好的效果。
尽管结合具体特征及其实施例对本申请进行了描述，显而易见的，在不脱离本申请的范围的情况下，可对其进行各种修改和组合。相应地，本说明书和附图仅仅是所附权利要求所界定的本申请的示例性说明，且视为已覆盖本申请范围内的任意和所有修改、变化、组合或等同物。倘若本申请的这些修改和变型属于本申请权利要求及其等同技术的范围之内，则本申请也意图包含这些改动和变型在内。

Claims (26)

  1. 一种资源预留方法，其特征在于，所述方法包括：
    第一终端设备接收来自第二终端设备的第一指示信息，所述第一指示信息用于指示第一时频资源，所述第一时频资源为所述第二终端设备预留的资源；
    所述第一终端设备根据以下一项或多项确定是否预留所述第一时频资源：
    第一参考信号接收功率以及已经预留所述第一时频资源的终端设备的数量；所述第一参考信号接收功率为所述第一指示信息对应的物理侧行链路控制信道或物理侧行链路共享信道的参考信号接收功率。
  2. 根据权利要求1所述的方法，其特征在于，所述第一终端设备根据第一参考信号接收功率确定是否预留所述第一时频资源，包括：
    所述第一终端设备在所述第一参考信号接收功率低于第一功率门限的情况下，确定预留所述第一时频资源；
    或者，第一终端设备在所述第一参考信号接收功率低于第二功率门限且高于第三功率门限的情况下，确定预留所述第一时频资源。
  3. 根据权利要求2所述的方法，其特征在于，所述第一功率门限，所述第二功率门限或者所述第三功率门限是根据信道繁忙比率，信道占用比率和对信道侦听为繁忙的次数中的一项或多项信息确定的。
  4. 根据权利要求1-3任一项所述的方法，其特征在于，所述第一终端设备根据已经预留所述第一时频资源的终端设备的数量确定是否预留所述第一时频资源，包括：
    所述第一终端设备在已经预留第一时频资源的终端设备的数量低于第一门限的情况下，确定预留所述第一时频资源。
  5. 根据权利要求4所述的方法，其特征在于，所述第一门限是根据信道繁忙比率，信道占用比率和对信道侦听为繁忙的次数中的一项或多项信息确定的。
  6. 根据权利要求1-5任一项所述的方法，其特征在于，所述第一时频资源在资源选择窗内。
  7. 根据权利要求6所述的方法，其特征在于，所述资源选择窗的起始时域位置是根据第一先听后说LBT完成时间点确定的；其中，所述第一LBT完成时间点是根据LBT计数器的值确定的。
  8. 根据权利要求1-7任一项所述的方法，其特征在于，所述方法还包括：
    所述第一终端设备根据第一LBT完成时间点，确定是否进行资源重选；其中，所述第一LBT完成时间点是根据LBT计数器的值确定的。
  9. 根据权利要求8所述的方法，其特征在于，所述第一终端设备根据第一LBT完成时间点，判断是否进行资源重选，包括：
    在所述第一时频资源的起始时域位置在所述第一LBT完成时间点之前的情况下，所述第一终端设备确定进行资源重选并选择第二时频资源；所述第二时频资源的起始时域位置在所述第一LBT完成时间点之后；
    或者，在所述第一时频资源的起始时域位置在所述第一LBT完成时间点之后的情况下，所述第一终端设备确定不进行资源重选。
  10. 根据权利要求8或9所述的方法，其特征在于，所述第一终端设备选择第二时频资源，包括：
    所述第一终端设备根据以下一项或多项选择第二时频资源：
    第二参考信号接收功率以及已经预留所述第二时频资源的终端设备的数量；所述第二参考信号接收功率为所述第二指示信息对应的物理侧行链路控制信道或物理侧行链路共享信道的参考信号接收功率。
  11. 根据权利要求1-10任一项所述的方法，其特征在于，在所述第一终端设备和所述第二终端设备的LBT计数器的值递减为0，且所述第一终端设备的业务数据的优先级高于所述第二终端设备的业务数据的优先级的情况下，所述方法还包括：
    所述第一终端设备在所述第一时频资源上发送所述业务数据。
  12. 根据权利要求1-11任一项所述的方法，其特征在于，
    所述第一指示信息承载于第一级侧行链路控制信息、第二级侧行链路控制信息、侧行链路媒体接入控制控制元素或者PC5无线资源控制信令中的至少一项信息。
  13. 一种资源预留方法，其特征在于，所述方法包括：
    第一终端设备根据先听后说LBT计数器N的值，确定第一LBT完成时间点；
    所述第一终端设备根据所述第一LBT完成时间点，在资源选择窗内预留第一时频资源和/或确定是否进行资源重选。
  14. 根据权利要求13所述的方法，其特征在于，所述第一终端设备根据所述第一LBT完成时间点，在资源选择窗内预留第一时频资源，包括：
    所述第一终端设备在所述资源选择窗内预留起始时域位置在所述第一LBT完成时间点之后的第一时频资源。
  15. 根据权利要求13所述的方法，其特征在于，所述第一终端设备根据第一LBT完成时间点，确定是否进行资源重选，包括：
    在所述第一时频资源的起始时域位置在所述第一LBT完成时间点之前的情况，所述第一终端设备确定进行资源重选并选择第二时频资源；所述第二时频资源的起始时域位置在所述第一LBT完成时间点之后。
  16. 根据权利要求15所述的方法，其特征在于，所述第一终端设备根据以下一项或多项选择第二时频资源：
    第二参考信号接收功率以及已经预留所述第二时频资源的终端设备的数量；其中，所述第二参考信号接收功率为所述第二指示信息对应的物理侧行链路控制信道或物理侧行链路共享信道的参考信号接收功率。
  17. 根据权利要求16所述的方法，其特征在于，所述第一终端设备选择第二时频资源，包括：
    在已经预留所述第二时频资源的终端设备的数量低于第一门限的情况下，所述第一终端设备选择所述第二时频资源。
  18. 根据权利要求17所述的方法，其特征在于，所述第一门限是根据信道繁忙比率，信道占用比率和对信道侦听为繁忙的次数中的一项或多项信息确定的。
  19. 根据权利要求16所述的方法，其特征在于，所述第一终端设备选择第二时频资源，包括：
    在所述第二时频资源被第二终端设备预留，且第二参考信号接收功率低于第一功率门限的情况下，
    或者，在所述第二时频资源被第二终端设备预留，所述第二参考信号接收功率低于第二功率门限且高于第三功率门限的情况下，所述第一终端设备选择所述第二时频资源。
  20. 根据权利要求19所述的方法，其特征在于，所述第一功率门限，所述第二功率门限或者所述第三功率门限是根据信道繁忙比率，信道占用比率和对信道侦听为繁忙的次数中的一项或多项信息确定的。
  21. 根据权利要求16所述的方法，其特征在于，所述第一终端设备选择第二时频资源，包括：
    在所述第二时频资源被第二终端设备预留，且所述第二参考信号接收功率低于第二门限的情况下，所述第一终端设备重新选择所述第二时频资源。
  22. 根据权利要求21所述的方法，其特征在于，所述第二门限是根据第二指示信息指示的优先级以及所述第一终端设备待发送的数据的优先级确定的；其中，所述第二指示信息用于指示所述第二时频资源。
  23. 一种通信装置，其特征在于，包括：用于实现权利要求1-12任一项所述的方法的模块或单元；或者，用于实现权利要求13-22任一项所述的方法的模块或单元。
  24. 一种通信装置，其特征在于，所述通信装置包括：处理器，所述处理器用于执行存储器存储的指令；当所述指令被所述处理器运行时，使得所述通信装置执行权利要求1-12中任一项所述的方法，或者，使得所述通信装置实现权利要求13-22中任一项所述的方法。
  25. 一种计算机可读存储介质，其特征在于，其上存储有计算机程序，当所述计算机程序被计算机执行时使得权利要求1-12中任一项所述的方法被执行，或者，使得权利要求13-22中任一项所述的方法被执行。
  26. 一种计算机程序产品，其特征在于，所述计算机程序产品包含计算机指令，当所述指令被计算机执行时使得权利要求1-12中任一项所述的方法被执行，或者，使得权利要求13-22中任一项所述的方法被执行。
PCT/CN2023/104302 2022-08-12 2023-06-29 资源预留方法、装置及存储介质 WO2024032231A1 (zh)

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WO2022061774A1 (zh) * 2020-09-25 2022-03-31 Oppo广东移动通信有限公司 无线通信方法和终端
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US20220061095A1 (en) * 2020-08-20 2022-02-24 Qualcomm Incorporated Listen-before-talk (lbt) aware autonomous sensing for sidelink
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