WO2024061092A1 - 通信方法和装置 - Google Patents

通信方法和装置 Download PDF

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Publication number
WO2024061092A1
WO2024061092A1 PCT/CN2023/118726 CN2023118726W WO2024061092A1 WO 2024061092 A1 WO2024061092 A1 WO 2024061092A1 CN 2023118726 W CN2023118726 W CN 2023118726W WO 2024061092 A1 WO2024061092 A1 WO 2024061092A1
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Prior art keywords
cpe
resource
length
transmission
terminal device
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PCT/CN2023/118726
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English (en)
French (fr)
Inventor
刘云
黎超
Original Assignee
华为技术有限公司
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Publication of WO2024061092A1 publication Critical patent/WO2024061092A1/zh

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Classifications

    • 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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/04—Wireless resource allocation
    • H04W72/044—Wireless resource allocation based on the type of the allocated resource
    • H04W72/0453—Resources in frequency domain, e.g. a carrier in FDMA
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/12—Wireless traffic scheduling
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/20—Control channels or signalling for resource management
    • H04W72/25—Control channels or signalling for resource management between terminals via a wireless link, e.g. sidelink
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/50—Allocation or scheduling criteria for wireless resources
    • H04W72/56—Allocation or scheduling criteria for wireless resources based on priority criteria
    • H04W72/566—Allocation or scheduling criteria for wireless resources based on priority criteria of the information or information source or recipient

Definitions

  • the present application relates to the field of communication, and more specifically, to a communication method and device.
  • spectrum resources can be divided into licensed spectrum and unlicensed spectrum.
  • SL sidelink
  • unlicensed spectrum is an important evolution direction.
  • terminal devices need to select physical resources for transmitting data in a resource pool. For example, the terminal device can seize the channel by listening before talk (LBT), or share the resources obtained by other terminal devices after seizing the channel to transmit data.
  • LBT listening before talk
  • any technology can be used as long as certain access rules are met. Therefore, it may happen that different terminal devices reserve the same resource, that is, the resources selected by different terminal devices collide, resulting in transmission interruption.
  • the present application provides a communication method and apparatus, which avoids resource collisions between different terminal devices by considering the impact of cyclic prefix extension (CPE) when selecting resources, thereby improving spectrum utilization and system transmission performance.
  • CPE cyclic prefix extension
  • a communication method is provided, which method can be executed by a first terminal device (for example, user equipment (UE1)), or can also be executed by a chip or circuit for the first terminal device, This application does not limit this.
  • UE1 user equipment
  • a chip or circuit for the first terminal device This application does not limit this.
  • the following description takes execution by the first terminal device as an example.
  • the method includes: a first terminal device receives a reservation message, the reservation message indicates a second resource reserved by a second terminal device; the first terminal device determines a second cyclic prefix extension CPE length according to the reservation message, and the second CPE length corresponds to the second resource; the first terminal device determines a third resource or adjusts the first CPE length according to the first CPE length and the second CPE length; wherein the first CPE length is determined according to the priority of a first transmission of the first terminal device, and the first CPE length corresponds to the first resource, the first resource is a resource that the first terminal device has selected for the first transmission, the first resource overlaps with at least part of the time domain resources of the second resource, and part or all of the third resource is used for the first terminal device to perform the first transmission.
  • the first terminal device when the first terminal device senses that the resources reserved by other terminal devices overlap in the time unit with the resources that the first terminal device has selected, it determines whether to continue to occupy the time unit by comparing the CPE length. , try to avoid the transmission of the first terminal device from being blocked by the transmission of other terminal devices (or avoid the transmission of the first terminal device from blocking the transmission of other terminal devices), improve transmission efficiency, and avoid unnecessary waste of spectrum resources. That is, by introducing the CPE length in the process of resource reservation and re-evaluation, the resources used for the first transmission are re-determined, the utilization of spectrum resources is improved, and the transmission performance is guaranteed.
  • the first terminal device determines the third resource or adjusts the first CPE length according to the first CPE length and the second CPE length, including: when the first CPE length is less than In the case of the second CPE length, the first terminal device determines the third resource.
  • the first terminal device performs resource reselection to avoid the first transmission of the first terminal device being blocked by transmissions of other UEs and ensure user experience. test. It should be understood that this implementation does not limit whether the frequency domain resources on the time domain resources overlap.
  • the first terminal device determines the third resource, including: when the first CPE length is less than the second CPE length length, and when at least part of the frequency domain resources of the first resource and the second resource overlap, the first terminal device determines the third resource.
  • the first terminal device performs resource reselection to avoid the first transmission of the first terminal device being blocked by the transmission of other UEs and avoid frequency Eliminate unnecessary waste of domain resources and improve spectrum utilization and system transmission performance.
  • the first terminal device determines the third resource or adjusts the first CPE length according to the first CPE length and the second CPE length, including: when the first CPE length is equal to The second CPE length, when at least part of the frequency domain resources of the first resource and the second resource overlap, and the received power (reference signal received power, RSRP) of the reference signal of the reservation message is higher than the first threshold, the first terminal device Identify third resources.
  • RSRP reference signal received power
  • the frequency domain resources at least partially overlap, and the RSRP of the reservation message is higher than the first threshold , by comparing the first CPE length with other CPE lengths, even if the CPE length corresponding to the transmission of other UEs is equal to the first CPE length, the first terminal device performs resource reselection to avoid the first transmission of the first terminal device being blocked by the transmission of other UEs. Blocking, while avoiding unnecessary waste of frequency domain resources, improving spectrum utilization and reducing transmission delay.
  • the first terminal device determines the third resource or adjusts the first CPE length according to the first CPE length and the second CPE length, including: the first terminal device determines the third resource or adjusts the first CPE length according to the first CPE length.
  • the length of the third CPE is greater than or equal to the length of the second CPE.
  • UE1 can choose to adjust its own CPE length to avoid UE1's transmission being blocked by UE2's transmission, and/or to avoid UE2's transmission being blocked by UE1's transmission, ensuring user experience and transmission performance.
  • the first terminal device determines a fourth CPE length according to the reservation message, the fourth CPE length corresponds to the fourth resource, and the fourth CPE length is greater than the second CPE length; wherein , the first terminal device determines the third resource or adjusts the first CPE length according to the first CPE length and the second CPE length, including: the first terminal device adjusts according to the first CPE length, the fourth CPE length and the second CPE length.
  • the first CPE length of the first terminal device in the first time unit is the third CPE length.
  • the first time unit is the time domain resource of the overlapping part of the first resource and the second resource.
  • the third CPE length is greater than or equal to the fourth CPE length.
  • the first terminal device may choose to adjust its own CPE length to avoid the first transmission of the first terminal device being blocked by transmissions of other UEs, and/or to avoid the transmission of other terminal devices being blocked by the first terminal.
  • the device's transmission blocking ensures user experience and transmission performance, and improves user transmission efficiency and spectrum utilization.
  • the first terminal device adjusts the first CPE length of the first terminal device in the first time unit to a third value based on the first CPE length and the second CPE length.
  • the CPE length includes: when the first CPE length is greater than or less than the second CPE length, at least part of the frequency domain resources of the first resource and the second resource overlap, and the RSRP of the reservation message is lower than the first threshold, the first terminal The device adjusts the first CPE length on the first time unit to the third CPE length.
  • the first terminal device adjusts the first CPE length of the first terminal device in the first time unit to a third value based on the first CPE length and the second CPE length.
  • the CPE length includes: in the case that the first CPE length is greater than or less than the second CPE length, and the frequency domain resources of the first resource and the second resource do not overlap, the first terminal device adjusts the first CPE length in the first time unit.
  • the CPE length is the third CPE length.
  • the second CPE length is determined based on the priority of transmission corresponding to the second resource; or, the second CPE length is determined based on the CPE length occupied by the reservation message.
  • the first terminal device can determine the CPE length occupied by the transmission of each reservation message and the priority of the transmission of the reservation resources of each reservation message, and then determine the CPE length and the transmission priority of the reservation resources of each reservation message.
  • the transmission priority determines the second CPE length.
  • the second aspect provides a communication method, which can be executed by a first terminal device (for example, UE1), or can also be executed by a chip or circuit used in the first terminal device, which is not limited in this application.
  • a first terminal device for example, UE1
  • a chip or circuit used in the first terminal device which is not limited in this application.
  • the following description takes execution by the first terminal device as an example.
  • the method includes: the first terminal device receives a reservation message, the reservation message indicates the second resource reserved by the second terminal device; the first terminal device determines the second cyclic prefix extension CPE length according to the reservation message, and the second CPE length corresponds to the second resource ; The first terminal device determines a candidate resource set according to the first CPE length and the second CPE length. Some or all of the resources in the candidate resource set are used by the first terminal device to perform the first transmission. The first CPE length is determined according to the first terminal device. The priority of the first transmission is determined.
  • the candidate resource set is determined by comparing the CPE lengths of different terminal devices. Resource selection is performed based on the CPE length to prevent the transmission of the first terminal device from being blocked by the transmission of other terminal devices (or to prevent the transmission of the first terminal device from blocking the transmission of other terminal devices), thereby improving the transmission efficiency of the terminal device. Avoid unnecessary waste of spectrum resources and ensure system transmission performance.
  • the first terminal device determines a candidate resource set based on the first CPE length and the second CPE length, including: when the first CPE length is less than the second CPE length Next, the first terminal device excludes the third resource to obtain a set of candidate resources.
  • the third resource is the frequency domain resource in the time unit where the second resource is located.
  • UE1 when UE1 senses that the length of other CPEs is greater than the length of the first CPE, UE1 can exclude the frequency domain resources in the time unit where the reserved resources corresponding to the other CPE lengths are located from the candidate resource pool to avoid causing differences.
  • Blocking transmission between terminal devices can reduce unnecessary waste of spectrum resources (especially frequency domain resources not included in the second resource in the time unit where the second resource is located), improve the transmission efficiency of the terminal device, and enhance user experience.
  • the first terminal device determines a candidate resource set based on the first CPE length and the second CPE length, including: when the first CPE length is greater than or equal to the second CPE length
  • the first terminal device uses the fourth resource as a candidate resource set; wherein the fourth resource includes: resources on the first time unit, and the time unit where the first time unit and the second resource are located do not overlap, that is, Resources in the time unit reserved by other UEs; and/or part or all of the resources in the time unit where the second resource is located.
  • UE1 when UE1 senses that the length of other CPEs is less than the length of the first CPE, UE1 can use some or all of the resources in the time unit where the reserved resources corresponding to the other CPE lengths are located as candidate resources. In addition, it can use shorter Transmitting other CPE lengths can avoid blocking the transmission of other terminal equipment as much as possible, reduce unnecessary waste of spectrum resources, and improve the transmission efficiency of terminal equipment.
  • the first terminal device may also determine the third CPE length according to the reservation message, the third CPE length corresponds to the third resource, and the third CPE length is smaller than the second CPE length. , the third resource and the second resource are located in the same time unit.
  • the second CPE length may be the longest CPE length corresponding to all reserved resources in the time unit.
  • UE1 can correspond the second CPE length and the third CPE length. All reservation resources are used as candidate resources.
  • the first terminal device determines a set of candidate resources based on the first CPE length and the second CPE length, including: when the first CPE length is equal to the second CPE length and the received power RSRP of the reference signal of the reservation message is higher than the first threshold, the first terminal device excludes resources that at least partially overlap with the second resources to obtain a set of candidate resources.
  • UE1 when UE1 senses that the length of other CPEs is equal to the length of the first CPE, it further considers the length of the reservation message. RSRP limit, then UE1 can use some or all of the resources in the time unit where the reservation resources corresponding to other CPE lengths are located as candidate resources, and select the resources corresponding to the CPE length that is the same as the first CPE length for the first transmission, which can not only avoid UE1's The transmission is blocked by the transmission of other terminal equipment. At the same time, it can prevent the transmission of UE1 from blocking the transmission of other terminal equipment, improve the transmission efficiency of the terminal equipment, avoid unnecessary waste of spectrum resources, and ensure the system transmission performance.
  • the candidate resource set includes a first candidate resource subset, and/or a second candidate resource subset, and the second CPE corresponding to the resources in the first candidate resource subset.
  • the length is equal to the first CPE length, and the second CPE length corresponding to the resources in the second candidate resource subset is smaller than the first CPE length.
  • the first candidate resource subset equal to the first CPE length and the second candidate resource set shorter than the first CPE length can be used as the candidate resource set individually or jointly.
  • a subset is reported to the MAC layer for the MAC layer to preferentially select the first candidate resource subset and/or the second candidate resource subset as the first transmission resource.
  • the candidate resource set includes a third candidate resource subset, the second CPE length corresponding to the resources in the third candidate resource subset is equal to the first CPE length, and the third The resources in the candidate resource subset are resources in the first time unit that do not overlap with the time unit in which the second resource is located, that is, resources in the time unit that have not been reserved by other UEs.
  • the resources in the time unit without reservation and the candidate resources with the same length as the first CPE can be used as a separate candidate resource subset in the candidate resource set and reported to the MAC layer for priority selection by the MAC layer.
  • the third candidate resource subset can not only prevent the transmission of UE1 from being blocked by the transmission of other terminal devices, but also prevent the transmission of UE1 from blocking the transmission of other terminal devices, improve the transmission efficiency of the terminal device, and avoid spectrum resources. Eliminate unnecessary waste and ensure system transmission performance.
  • the first terminal device when the candidate resource set cannot meet the first transmission requirement of the first terminal device, the first terminal device increases the first CPE length; wherein, the first The terminal device determines a candidate resource set based on the first CPE length and the second CPE length, including: the first terminal device determines the candidate resource set based on the increased first CPE length and second CPE length.
  • the candidate resource set cannot meet the first transmission requirements of the first terminal device, including one or more of the following: the time at which the candidate resource in the candidate resource set is located The number of units is lower than the second threshold; or the number of candidate resources in the candidate resource set is lower than the third threshold.
  • the first terminal device can increase the first CPE length to obtain more candidate resources for the first transmission, which can ensure the transmission of UE1 performance and avoid unnecessary waste of spectrum resources.
  • the second CPE length is determined based on the priority of transmission corresponding to the second resource; or, the second CPE length is determined based on the CPE length occupied by the reservation message. of.
  • the first terminal device can determine the CPE length occupied by the transmission of each reservation message and the priority of the transmission of the reservation resources of each reservation message, and then determine the CPE length and the transmission priority of the reservation resources of each reservation message.
  • the transmission priority determines the second CPE length.
  • a communication device including: a transceiver unit, configured to receive a reservation message indicating a second resource reserved by a second terminal device; and a processing unit, configured to determine a second cyclic prefix extension CPE based on the reservation message. length, the second CPE length corresponds to the second resource; the processing unit is also configured to determine the third resource or adjust the first CPE length according to the first CPE length and the second CPE length; wherein the first CPE length is based on the first CPE length.
  • the priority of the first transmission of the terminal device is determined, and the first CPE length corresponds to the first resource, the first resource is the resource that the first terminal device has selected for the first transmission, and the first resource and at least part of the second resource.
  • the time domain resources overlap, and part or all of the third resource is used by the first terminal device to perform the first transmission.
  • the transceiver unit can perform the processing of receiving and sending in the aforementioned first aspect, and the processing unit can perform other processing in addition to receiving and transmitting in the aforementioned first aspect.
  • a communication device including: a transceiver unit, configured to receive a reservation message indicating the second resource reserved by the second terminal device; and a processing unit, configured to determine the second cyclic prefix extension CPE according to the reservation message length, the second CPE length corresponds to the second resource; the processing unit is also used to determine the candidate resource set according to the first CPE length and the second CPE length, and the candidate resource Some or all of the resources in the set are used by the first terminal device to perform the first transmission, and the first CPE length is determined according to the priority of the first transmission by the first terminal device.
  • the transceiver unit can perform the processing of receiving and transmitting in the aforementioned second aspect, and the processing unit can perform other processing in addition to receiving and transmitting in the aforementioned second aspect.
  • the fifth aspect provides a communication method, which can be executed by a first terminal device (for example, UE1), or can also be executed by a chip or circuit used in the first terminal device, which is not limited in this application.
  • a first terminal device for example, UE1
  • a chip or circuit used in the first terminal device which is not limited in this application.
  • the following description takes execution by the first terminal device as an example.
  • the method includes: the first terminal device receives a first reservation message, the first reservation message indicates the second resource reserved by the second terminal device; the first terminal device determines the second cyclic prefix extension CPE starting point and the second resource according to the first reservation message.
  • the priority of the second transmission corresponding to the resource, and the second CPE starting point corresponds to the second resource; the first terminal device determines the first CPE according to the priority of the second transmission, the second CPE starting point, and the priority of the first transmission.
  • the starting point or the third resource, where the first CPE starting point corresponds to the first resource, the first resource is the resource selected by the first terminal device for the first transmission, and the first resource and the second resource are at least in the same time unit. Part of the frequency domain resources overlap, and part or all of the third resource is used by the first terminal device to perform the first transmission.
  • the first terminal device when the first terminal device senses that the second resources reserved by other terminal devices overlap with the first resources selected by the first terminal device in the same time unit, the first terminal device compares The second CPE starting point, the priority of the second transmission and the priority of the first transmission determine the location of the first CPE starting point, and try to avoid the transmission of the first terminal device being blocked by the transmission of other terminal devices (or, avoid The transmission of the first terminal device blocks the transmission of other terminal devices), improving transmission efficiency and avoiding unnecessary waste of spectrum resources. That is, by introducing the second CPE starting point and the priority of the second transmission during the resource reservation and re-evaluation process, the first CPE starting point for the first transmission is re-determined to improve the utilization of spectrum resources, and Ensure transmission performance.
  • the first terminal device determines the first CPE starting point or the third CPE starting point based on the priority of the second transmission, the second CPE starting point and the priority of the first transmission.
  • the resource includes: when the priority of the first transmission is higher than or equal to the priority of the second transmission, the first terminal device determines that the first CPE starting point is no later than the second CPE starting point.
  • the priority of the first transmission and the second transmission is earlier than or equal to the second CPE starting point, or in other words, the first CPE starting point is the second CPE starting point and CPE starting point #1 (that is, before determining the first CPE starting point, the first terminal device is the first The earlier of the determined CPE starting point).
  • This method can prevent the first transmission of the first terminal device from being blocked by the transmission of other terminal devices and ensure the user experience of the first terminal device. In other words, this method can ensure that high-priority transmissions are not blocked by low-priority transmissions.
  • the first terminal device determines the first CPE starting point or the third CPE starting point based on the priority of the second transmission, the second CPE starting point and the priority of the first transmission.
  • the resource includes: when the priority of the first transmission is equal to the priority of the second transmission, the first terminal device determines that the first CPE starting point is equal to the second CPE starting point.
  • the first terminal equipment determines that the first CPE starting point is equal to the second CPE starting point, or in other words, the first CPE starting point and the second CPE The starting point is in the same position.
  • This method can prevent the first transmission of the first terminal device from being blocked by the transmission of other terminal devices and ensure the user experience of the first terminal device. In other words, this method can ensure that different terminal devices with the same transmission priority do not block each other, that is, The first terminal device and the second terminal device can transmit at the same time, thereby improving spectrum utilization.
  • the first terminal device determines the first CPE starting point or the third CPE starting point based on the priority of the second transmission, the second CPE starting point and the priority of the first transmission.
  • the resource includes: when the priority of the first transmission is lower than or equal to the priority of the second transmission, the first terminal device determines that the first CPE starting point is not earlier than the second CPE starting point.
  • the first terminal device determines that the first CPE starting point is not earlier than the second CPE starting point, or that the first CPE starting point The starting point is later than or equal to the second CPE starting point, or in other words, the first CPE starting point is the second CPE starting point and CPE starting point #1 (that is, before determining the first CPE starting point, the first terminal device is the first Transport determined CPE start The later one of points).
  • This method can prevent the first transmission of the first terminal device from blocking the transmission of other terminal devices and ensure the user experience of the second terminal device. In other words, this method can ensure that high-priority transmissions are not blocked by low-priority transmissions.
  • the first terminal device determines the first CPE starting point or the third CPE starting point based on the priority of the second transmission, the second CPE starting point and the priority of the first transmission.
  • the resources include: when the priority of the first transmission is lower than or equal to the priority of the second transmission, the first terminal device determines a third resource, where the third resource does not include the second resource.
  • the first terminal device when the resources reserved by other terminal devices overlap with some frequency domain resources of the first resource in the same time unit (for example, time slot m), by comparing the priority of the first transmission with the priority of the second transmission, that is, when the priority of the first transmission is lower than or equal to the transmission priority of other terminal devices, the first terminal device reselects resources to avoid the first transmission of the first terminal device being blocked by the transmission of other terminal devices, thereby ensuring user experience.
  • the first terminal device receives a second reservation message, the second reservation message indicates a third resource reserved by the third terminal device, and the third resource is in the same location as the first resource. At least part of the frequency domain resources on the time unit overlap; the first terminal device determines the third CPE starting point and the priority of the third transmission corresponding to the third resource according to the second reservation message, and the third CPE starting point corresponds to the third resource.
  • the first terminal device determines the first CPE starting point or the third resource according to the priority of the second transmission, the second CPE starting point and the priority of the first transmission, including: the first terminal device determines the first CPE starting point or the third resource according to the priority of the second transmission.
  • the first terminal device determines the first CPE starting point as the first preset CPE starting point, or the second preset CPE starting point, The second preset CPE starting point is one of the set of preset CPE starting points.
  • the first terminal device determines the first CPE starting point as the first preset CPE starting point or the second preset CPE starting point to prevent the first transmission of the first terminal device from being blocked.
  • the transmission of other terminal devices is blocked, and/or the transmission of other terminal devices is prevented from being blocked by the transmission of the first terminal device, ensuring user experience and transmission performance, and improving user transmission efficiency and spectrum utilization.
  • the first preset CPE starting point and/or the set of preset CPE starting points are preconfigured.
  • the first preset CPE starting point is located within one symbol before the next AGC symbol
  • the set of preset CPE starting points includes the second preset CPE starting point.
  • the sub-carrier space sub-carrier space, When SCS) is 15kHz
  • the second preset CPE starting point is located within one symbol before the next AGC symbol
  • SCS sub-carrier space
  • the second preset CPE starting point is located at most 2 symbols before the next AGC symbol Inside.
  • the first resource occupies all frequency domain resources of one or more resource block sets on the first time unit, and the second resource occupies one or more resource block sets on the first time unit. Or some frequency domain resources of multiple resource block sets; wherein the second CPE starting point is the first preset CPE starting point.
  • the first terminal device occupies all frequency domain resources (full RB set) of one or more resource block sets on the first time unit, and the second terminal device occupies one or more resource blocks on the first time unit.
  • the first terminal The CPE starting point #1 of the device's first transmission is determined based on the priority (such as CAPC or priority).
  • the second preset CPE starting point coincides with the first preset CPE starting point, and the second preset CPE starting point is one of the set of preset CPE starting points.
  • the first terminal device determines the first CPE starting point or the third resource according to the priority of the second transmission and the second CPE starting point, and the first CPE starting point and the priority of the first transmission, including: in the first When the priority of the second transmission is higher than or equal to the priority of the first transmission, the first terminal device determines the first CPE starting point as the second preset CPE starting point.
  • the first preset CPE starting point and the first preset CPE starting point coincide with each other means that the CPE starting point is located within a symbol before the next AGC symbol.
  • the priority of the second transmission, the second CPE starting point and the first transmission are compared. That is, when the priority of the second transmission is higher than or equal to the priority of the first transmission, the first terminal device determines the first CPE starting point as the second preset CPE starting point, or in other words, the first CPE starting point is the same as the first preset CPE starting point.
  • This method can prevent the first transmission of the first terminal device from being blocked by the transmission of other terminal devices, ensure user experience and transmission performance, and improve user transmission efficiency and spectrum utilization.
  • the first resource occupies part of the frequency domain resources of one or more resource block sets on the first time unit, and the second resource occupies one or more resource block sets on the first time unit. Or all frequency domain resources of multiple resource block sets; wherein the second CPE starting point is a second preset CPE starting point, and the second preset CPE starting point is one of the preset CPE starting point sets.
  • the second terminal device occupies all frequency domain resources (full RB set) of one or more resource block sets on the first time unit, and the first terminal device occupies one or more resource blocks on the first time unit.
  • Partial frequency domain resources (partial RB set) of the set it can be considered that the second CPE starting point of the second transmission of the second terminal device is the second preset starting point, and the CPE starting point of the first transmission of the first terminal device# 1 can be the preset default value.
  • the second CPE starting point is determined based on the priority of the second transmission or the channel access priority CAPC, and the priority or CAPC of the second transmission is determined based on the priority of the second transmission. determined by a reservation message; or, the second CPE starting point is determined based on the CPE starting point of the first reservation message.
  • the first terminal device can determine the CPE starting point occupied by the transmission of each reservation message, and the transmission priority of the reservation resources of each reservation message, and then determine the CPE starting point according to the multiple CPEs. The starting point and the corresponding transmission priority determine the first CPE starting point.
  • a communication device including: a transceiver unit, configured to receive a first reservation message indicating a second resource reserved by a second terminal device; and a processing unit, configured to determine according to the first reservation message
  • the second CPE starting point corresponds to the priority of the second transmission of the second resource, and the second CPE starting point corresponds to the second resource; the processing unit is also configured to determine the priority of the second transmission, the second CPE starting point and the second resource.
  • a priority of transmission determine the first CPE starting point, where the first CPE starting point corresponds to the first resource, the first resource is the resource selected by the first terminal device for the first transmission, the first resource and the second resource are in At least part of the frequency domain resources on the same time unit overlap.
  • the transceiver unit can perform the processing of receiving and transmitting in the foregoing fifth aspect, and the processing unit can perform other processing in addition to receiving and transmitting in the foregoing fifth aspect.
  • a communication device including a transceiver, a processor and a memory.
  • the processor is used to control the transceiver to send and receive signals.
  • the memory is used to store a computer program.
  • the processor is used to call and run the computer from the memory.
  • the program enables the communication device to execute the method in any possible implementation manner of the first aspect, the second aspect, or the fifth aspect.
  • processors there are one or more processors and one or more memories.
  • the memory may be integrated with the processor, or the memory may be provided separately from the processor.
  • the communication device further includes a transmitter (transmitter) and a receiver (receiver).
  • a communication system including a network device, a first terminal device and at least one second terminal device.
  • a computer-readable storage medium stores a computer program or code, and when the computer program or code is run on a computer, the computer executes a method in any possible implementation of the first aspect, the second aspect, or the fifth aspect.
  • a chip including at least one processor, the at least one processor is coupled to a memory, the memory is used to store a computer program, the processor is used to call and run the computer program from the memory, so that the installation A device with the chip system performs the method in any possible implementation manner of the first aspect, the second aspect, or the fifth aspect.
  • the chip may include an input circuit or interface for sending information or data, and an output circuit or interface for receiving information or data.
  • a computer program product includes: computer program code.
  • the device causes the device to execute the above first or second aspect or the fifth aspect.
  • FIGS 1 and 2 are schematic diagrams of wireless communication systems suitable for embodiments of the present application.
  • Figure 3 is a schematic diagram of resource selection by different terminal devices provided by an embodiment of the present application.
  • FIG. 4 is a flow chart of a communication method 400 provided in an embodiment of the present application.
  • Figure 5 is a schematic diagram of the results of space reservation and re-evaluation check provided by the embodiment of the present application.
  • Figure 6 is a schematic flowchart of the communication method 600 provided by the embodiment of the present application.
  • FIGS 7 to 9 are schematic diagrams of resource selection provided by embodiments of the present application.
  • Figure 10 is a schematic diagram of resource selection by different terminal devices provided by an embodiment of the present application.
  • Figure 11 is a schematic flowchart of the communication method 1100 provided by the embodiment of the present application.
  • Figures 12 to 13 are schematic diagrams of resource selection provided by embodiments of the present application.
  • Figure 14 is a schematic structural diagram of a communication device 1000 provided by an embodiment of the present application.
  • Figure 15 is a schematic structural diagram of a communication device 2000 provided by an embodiment of the present application.
  • Figure 16 is a schematic structural diagram of a chip system 3000 provided by an embodiment of the present application.
  • the technical solutions provided by this application can be applied to various communication systems, such as fifth generation (5th generation, 5G) or new radio (NR) systems, long term evolution (LTE) systems, LTE frequency division Duplex (frequency division duplex, FDD) system, LTE time division duplex (TDD) system, etc.
  • the technical solution provided by this application can also be applied to future communication systems, such as the sixth generation (6th generation, 6G) mobile communication system.
  • the technical solution provided by this application can also be applied to device-to-device (D2D) communication, vehicle-to-everything (V2X) communication, machine-to-machine (M2M) communication, machine type Communication (machine type communication, MTC), and Internet of Things (Internet of things, IoT) communication systems or other communication systems.
  • D2D device-to-device
  • V2X vehicle-to-everything
  • M2M machine-to-machine
  • MTC machine type Communication
  • Internet of Things Internet of things, IoT
  • V2X communication may include: vehicle-to-vehicle (V2V) communication, vehicle-to-infrastructure (V2I) communication, vehicle-to-pedestrian (V2P) communication ) communication, vehicle-to-network (V2N) communication.
  • V2V refers to communication between vehicles.
  • V2P refers to the communication between vehicles and people (including pedestrians, cyclists, drivers, or passengers, etc.).
  • V2I refers to the communication between vehicles and infrastructure, such as road side units (RSU) or network equipment. Among them, RSU includes two types: terminal type RSU.
  • V2N refers to the communication between vehicles and network devices. It can be understood that the above is an illustrative description, and the embodiments of the present application are not limiting.
  • V2X can also include V2X communications based on the NR system of the current 3GPP Rel-16 and subsequent versions.
  • the terminal equipment in the embodiment of this application may also be called user equipment (UE), access terminal, user unit, user station, mobile station, mobile station, remote station, remote terminal, mobile device, user terminal, terminal , wireless communications equipment, user agent or user device.
  • UE user equipment
  • a terminal device can be a device that provides voice/data to users, for example, a handheld device with wireless connection function, a vehicle-mounted device, etc.
  • terminals are: mobile phones, tablet computers, laptops, PDAs, mobile internet devices (MID), wearable devices, virtual reality (VR) devices, augmented reality (AR) devices, wireless terminals in industrial control, wireless terminals in self-driving, wireless terminals in remote medical surgery, wireless terminals in smart grids, wireless terminals in transportation safety, wireless terminals in smart Wireless terminals in smart cities, wireless terminals in smart homes, cellular phones, cordless phones, session initiation protocol (SIP) phones, wireless local loop (WLL) stations, personal digital assistants (PDA), handheld devices with wireless communication functions, computing devices or other processing devices connected to wireless modems, wearable devices, terminal devices in 5G networks or terminal devices in future evolved public land mobile networks (PLMN), etc., the embodiments of the present application are not limited to this.
  • MID mobile internet devices
  • VR virtual reality
  • AR augmented reality
  • the terminal device may also be a wearable device.
  • Wearable devices can also be called wearable smart devices. It is a general term for applying wearable technology to intelligently design daily wear and develop wearable devices, such as glasses, gloves, watches, clothing and shoes, etc.
  • a wearable device is a portable device that is worn directly on the body or integrated into the user's clothing or accessories. Wearable devices are not just hardware devices, but also achieve powerful functions through software support, data interaction, and cloud interaction. In a broad sense, wearable smart devices include full-featured, large-sized devices that can achieve complete or partial functions without relying on smartphones. For example: smart watches or smart glasses, etc., and those that only focus on a certain type of application function need to be used in conjunction with other devices such as smartphones, such as various smart bracelets for physical sign monitoring, smart jewelry, etc.
  • the device for realizing the function of the terminal device may be a terminal device, or a device that can support the terminal device to realize the function, such as a chip system or a chip, and the device may be installed on in the terminal device.
  • the chip system may be composed of chips, or may include chips and other discrete devices.
  • the network device in the embodiment of the present application may be a device used to communicate with a terminal device.
  • the network device may also be called an access network device or a wireless access network device.
  • the network device may be a base station.
  • the network device in the embodiment of this application may refer to a radio access network (radio access network, RAN) node (or device) that connects the terminal device to the wireless network.
  • radio access network radio access network, RAN node (or device) that connects the terminal device to the wireless network.
  • the base station can broadly cover various names as follows, or be replaced with the following names, such as: Node B (NodeB), evolved base station (evolved NodeB, eNB), next generation base station (next generation NodeB, gNB), relay station, Access point, transmission point (transmitting and receiving point, TRP), transmitting point (TP), primary station, secondary station, multi-standard wireless (motor slide retainer, MSR) node, home base station, network controller, interface Ingress node, wireless node, access point (AP), transmission node, transceiver node, baseband unit (BBU), remote radio unit (RRU), active antenna unit (active antenna) unit, AAU), radio head (remote radio head, RRH), central unit (central unit, CU), distributed unit (distributed unit, DU), positioning node, etc.
  • NodeB Node B
  • eNB evolved base station
  • next generation NodeB next generation NodeB, gNB
  • relay station Access point
  • transmission point transmitting and receiving
  • the base station may be a macro base station, a micro base station, a relay node, a donor node or the like, or a combination thereof.
  • a base station may also refer to a communication module, modem or chip used in the aforementioned equipment or devices.
  • the base station can also be a mobile switching center and equipment that performs base station functions in D2D, V2X, and M2M communications, network-side equipment in 6G networks, equipment that performs base station functions in future communication systems, etc.
  • Base stations can support networks with the same or different access technologies. The embodiments of this application do not limit the specific technology and specific equipment form used by the network equipment.
  • Base stations can be fixed or mobile.
  • a helicopter or drone may be configured to act as a mobile base station, and one or more cells may move based on the mobile base station's location.
  • a helicopter or drone may be configured to serve as a device that communicates with another base station.
  • the network device mentioned in the embodiments of this application may be a device including a CU, or a DU, or a device including a CU and a DU, or a control plane CU node (central unit-control plane (CU- CP)) and user plane CU nodes (central unit user plane (CU-UP)) and DU node equipment.
  • CU- CP central unit-control plane
  • CU-UP central unit user plane
  • the device used to implement the function of the network device may be a network device, or may be a device that can support the network device to implement the function, such as a chip system or a chip, and the device may be installed in the network device.
  • the chip system may be composed of chips, or may include chips and other discrete devices.
  • Network equipment and terminal equipment can be deployed on land, indoors or outdoors, handheld or vehicle-mounted; they can also be deployed on water; they can also be deployed on aircraft, balloons and satellites in the sky. In the embodiments of this application, the scenarios in which network devices and terminal devices are located are not limited.
  • the technical solution of this application is mainly applied in side-link transmission scenarios, and the frequency bands used include but are not limited to unlicensed spectrum.
  • the unlicensed spectrum includes frequency bands near 2.4 GHz and frequency bands near 5.8 GHz.
  • the terminal equipment and the access network equipment can use unlicensed spectrum resources for wireless communication (for example, transmitting uplink information or transmitting downlink information).
  • the communication system can use licensed-assisted access (LAA), dual connectivity (DC), unlicensed-assisted access (standalone) technology, etc.
  • Figures 1 and 2 are schematic diagrams of a wireless communication system applicable to an embodiment of the present application.
  • the wireless communication system may include at least one terminal device, such as UE1, UE2, UE3, UE4, and UE5 as shown in the figure.
  • the wireless communication system may also include at least one network device, such as the network device shown in the figure.
  • Network equipment and terminal equipment can communicate through the Uu interface, and the link (link) communicating between the network equipment and terminal equipment can be recorded as a Uu link.
  • the network device and UE1 can communicate directly.
  • the network device and UE1 can communicate directly.
  • Communication can also be carried out through UE2; similarly, direct communication can be carried out between the network device and UE2, and communication between the network equipment and UE2 can also be carried out through UE1.
  • the Uu link represents a connection relationship between the terminal device and the network device, and is a logical concept rather than a physical entity.
  • the main link is only named for differentiation, and its specific naming does not limit the scope of protection of this application.
  • terminal equipment can directly communicate with each other, as shown in Figure 1 (a) to Figure 1 (c), Figure 2 (a) to Figure 2 (c), and UE1 and UE2 can communicate Direct communication.
  • end Terminal devices can communicate with each other through other devices, such as network devices or terminal devices, as shown in (a) of Figure 1.
  • UE1 and UE2 can communicate with each other through network devices, as shown in (a) of Figure 1.
  • d As shown in (d) of Figure 2, UE1 and UE2 can communicate through UE3.
  • the interface for communication between terminal devices can be recorded as a proximity-based services communication 5 (PC5) interface, and the multi-link communication between terminal devices can be recorded as a sidelink (sidelink).
  • PC5 proximity-based services communication 5
  • Side links may also be called side links or secondary links. It can be understood that the side link represents a connection relationship between terminal equipment and is a logical concept rather than a physical entity. The side link is only named for differentiation, and its specific naming does not limit the scope of protection of this application.
  • Unicast communication can be carried out between devices, such as unicast communication between terminal devices.
  • Unicast means that a sending terminal and a receiving terminal form a unicast connection pair.
  • unicast communication can be performed between UE1 and UE2.
  • Multicast communication can be carried out between devices, such as multicast communication between terminal devices.
  • Multicast means that a sending terminal and at least one receiving terminal form a multicast connection pair.
  • multicast communication can be performed between UE1 and UE2, UE4 and UE5.
  • network equipment and UE1 can communicate directly, and one UE1 can perform multicast communication with multiple UEs, such as UE2, UE4, and UE5.
  • Multicast communication between UE1 and multiple UEs can be carried out under network coverage, as shown in Figure 2 (a) or Figure 2 (b), or it can also be carried out without network coverage, as shown in Figure 2 (c) or (d) of Figure 2.
  • FIG. 2 illustrates the example of UE1 performing multicast communication with three UEs, and this is not limited.
  • UE1 can perform multicast communication with a larger number of UEs.
  • SL communication between terminal devices can be used in the Internet of Vehicles or intelligent transportation systems (ITS), such as the V2X communication mentioned above.
  • ITS intelligent transportation systems
  • the SL communication between the terminal device and the terminal device can be carried out under network coverage or without network coverage.
  • UE1 and other UEs can communicate under network coverage; or, as shown in Figure 1
  • UE1 and other UEs can communicate outside the network coverage (out-of-coverage) .
  • the configuration information during SL communication between the terminal device and the terminal device may be configured or scheduled by the network device, or may be independently selected by the terminal device. , not restricted.
  • FIG. 1 and FIG. 2 are only simplified schematic diagrams for ease of understanding.
  • the wireless communication system may also include other network devices or other terminal devices, which are not shown in FIG. 1 and FIG. 2 .
  • the embodiments of this application can be applied to any communication scenario in which the sending device and the receiving device communicate.
  • the embodiments of the present application do not specifically limit the specific structure of the execution subject of the method provided by the embodiment of the present application, as long as the program that records the code of the method provided by the embodiment of the present application can be executed according to the present application.
  • the methods provided by the embodiments are sufficient for communication.
  • the execution subject of the methods provided by the embodiments of the present application may be a terminal device, or a functional module in the terminal device that can call a program and execute the program.
  • the spectrum used by wireless communication systems is divided into two categories, licensed spectrum and unlicensed spectrum.
  • the UE can use the spectrum resources based on the scheduling of the network device.
  • unlicensed spectrum communication devices can use spectrum resources in a competitive manner.
  • SL communication on the unlicensed spectrum may be called SL-U
  • NR cellular communication on the unlicensed spectrum may be called NR-U.
  • LBT listen-before-talk
  • SL-U mainly refers to SL transmission in the unlicensed spectrum (unlicense band).
  • the standard introduces two access mechanisms including Type 1 and Type 2.
  • Type 1 is used for channel preemption scenarios and requires LBT, that is, monitoring is required before transmission.
  • the monitoring can be energy detection, that is, detecting energy at 9 ⁇ s. If it exceeds the threshold, it means that a UE is occupying the resource; conversely, if it does not exceed the threshold, it means that no UE is occupying the resource.
  • Type 2 is used to share transmission resources obtained by other UEs through Type 1.
  • UE1 uses Type 1 to seize transmission opportunities within a period of time (i.e., channel occupancy time (COT)). In addition to the transmission time occupied by itself, it can instruct other UEs to use Type 2 to access the transmission time occupied by UE1. The remaining transmission opportunities within the COT.
  • COT channel occupancy time
  • Type 2 further includes Type 2A and Type 2B.
  • Type 2A indicates that the channel will be occupied after an interval of 25 ⁇ s after the transmission of other UEs. That is, if no other UE is used within 25 ⁇ s by sensing the channel, the channel can be occupied.
  • Type 2B means that the channel is occupied after an interval of 16 ⁇ s after the transmission of other UEs. The difference from Type 2A is 9 ⁇ s, which is the length of a sensing slot.
  • the UE Before transmission, the UE must perform LBT on each 20MHz channel, and the 20MHz channel can be called an LBT channel. In order to avoid interference from different channels, the UE cannot send data on the entire 20MHz bandwidth. Instead, it leaves a part of the frequency band resources as a guard band and only sends data in the remaining part of the frequency domain resources. This part of the available resources is used It is called resource block set (RB set).
  • RB set resource block set
  • the protection bandwidth between the two RB sets can be used to transmit data and improve resource utilization.
  • SL transmission is based on resource pools.
  • Each resource pool contains one or more subchannels.
  • Each subchannel in the same resource pool occupies the same frequency domain resources (i.e., the number of physical resource blocks (PRBs)).
  • PRBs physical resource blocks
  • Different resource pools occupy the same frequency domain resources.
  • the frequency domain resources occupied by each sub-channel may be different.
  • a resource pool is a logical concept.
  • a resource pool includes multiple physical resources, any one of which is used to transmit data.
  • Each UE needs to select a resource from the resource pool when transmitting data. This resource selection process includes the following two situations:
  • the UE is controlled by the network device and selects a resource from the resource pool for data transmission according to the instruction information of the network device, also known as Mode 1;
  • the UE autonomously selects a resource from the resource pool for data transmission, also known as Mode2. That is, the UE has the opportunity to independently decide on resource selection and resource allocation.
  • the UE can exclude some occupied or high-interference resources based on the occupancy of the sensing spectrum, and select transmission resources on idle or low-interference resources.
  • the resource pool includes at least one LBT channel.
  • the resource pool includes an LBT channel with a channel bandwidth of 20MHz and a resource pool bandwidth of 20MHz.
  • the resource pool includes 2 LBT channels, the channel bandwidth is 20MHz, and the resource pool bandwidth is 40MHz.
  • the resource pool includes 5 LBT channels, the channel bandwidth is 20MHz, and the resource pool bandwidth is 100MHz.
  • CAPC channel access priority class
  • priority the higher the priority (the smaller the value of CAPC or priority), the corresponding CPE The longer the length.
  • SL-U can only be accessed at designated locations. Therefore, in order to better occupy the channel, the UE can send CPE to seize the channel before accessing the channel.
  • the specific length of time to seize the channel is related to the CAPC value, which can be specified in the standard or implemented internally in the UE.
  • Data or information can be carried through time-frequency resources.
  • time-frequency resources may include one or more time domain units (or may also be called time units).
  • a time domain unit can be a symbol, or a mini-slot, or a slot, or a partial slot, or a subframe, or a radio frame ( frame) etc.
  • time-frequency resources may include one or more frequency domain units.
  • a frequency domain unit can be a resource element (RE), or a resource block (RB), or a subchannel (subchannel), or a resource pool (resource pool), or a bandwidth (bandwidth) , or a bandwidth part (BWP), or a carrier (carrier), or a channel (channel), or an interlace RB, etc.
  • the UE may send multiple services at the same time, and the priorities of the multiple services may be different. Therefore, the priority of the UE can also be described as the service priority of the UE.
  • the service priority of the UE is specifically the transmission priority of the UE.
  • Service priority can also be called L1 priority (L1priority), physical layer priority, sidelink control information (sidelink control information, The priority carried in SCI), the priority corresponding to the physical side link share channel (PSSCH) associated with the SCI, the sending priority, the priority of sending PSSCH, the priority used for resource selection, and the logical channel priority, the highest level priority of the logical channel.
  • the priority level and the priority value may have a certain corresponding relationship.
  • the higher the priority level the lower the priority value.
  • the priority value range can be an integer from 1 to 8 or an integer from 0 to 7. If the priority value range is 1-8, then when the priority value is 1, it represents the highest level of priority.
  • the priority level and the priority value may have a certain corresponding relationship. For example, the higher the priority level, the lower the priority value, or the lower the priority level, the lower the priority value.
  • the priority value can range from 1 to 4, and the smaller the value, the higher the priority.
  • the UE determines the length of LBT based on different priorities. As described in Table 4.2.1-1 of TS 37.213, when the CAPC priority is 1, the COT is up to 2ms, and when the CAPC priority is 2 , the maximum COT duration is 4ms, and when the CAPC priority is 3 or 4, the maximum COT duration is 6ms or 10ms.
  • the terminal device will spontaneously perform resource perception and resource selection (or resource reservation) to determine the time-frequency resources occupied by the transmission.
  • the method for UE to perform resource perception and resource selection may include the following steps:
  • Step 1 The UE senses resources within the resource perception window, or performs resource perception, by decoding the physical sidelink control channel (PSCCH) and measuring the RSRP value.
  • PSCCH physical sidelink control channel
  • Step 2 The UE determines whether to exclude resources from the resource selection window by comparing the RSRP threshold and the RSRP measurement value based on the perception results of the resources in the resource perception window, thereby forming a candidate resource set. For example, in the resource perception window, if the RSRP measurement value of resource 1 is higher than the RSRP threshold, the resources in the reserved resources indicated by the SCI in resource 1 that fall within the resource selection window are excluded. On the contrary, the resources in the reserved resources indicated by the SCI in resource 1 that fall within the resource selection window are not excluded.
  • the RSRP threshold is related to the service priority indicated by the SCI and the service priority of the UE itself.
  • the reserved resources can be understood as resources pre-specified or occupied by a certain UE (for example, UE#1) for the subsequent transmission of information by the UE#1, so that other UEs (for example, UE#2) can exclude the reserved resources from the resource selection window of the UE#2 based on the resource perception results.
  • the physical layer will check whether the remaining available resources are greater than or equal to M*X%, where M is the number of all resources in the resource selection window, and X% is a pre-agreed percentage, such as 20%, 35% , 50%, etc. If the number of remaining available resources is less than M*X%, raise the RSRP threshold by 3dB and repeat the above process until the number of remaining available resources is greater than or equal to M*X%.
  • the physical layer will report the remaining available resources in the resource selection window to the MAC layer, and the MAC layer will randomly select the resources to send among the available resources. Among them, the remaining available resources in the resource selection window can be understood as a set of candidate resources.
  • Step 3 The UE selects resources that can be used to transmit SL information from the candidate resource set, where the SL information transmitted by the UE includes initial transmission information and several retransmission information.
  • Step 4 When certain conditions are met, for example, the reserved resources of the UE overlap with the reserved resources of other UEs, the UE triggers resource reselection.
  • Figure 3 is a schematic diagram of resource selection by different terminal devices provided by an embodiment of the present application.
  • the resource #2 reserved by UE-x coincides with the resource #1 selected by UE-1, and the CPE #2 corresponding to the resource #2 reserved by UE-x
  • the length is greater than the length of CPE#1 corresponding to resource #1 reserved by UE-1, then other subchannels on the RB set (for example, 20MHz) are unavailable, and the transmission of UE-1 will be subject to inter-UE blocking by UE-x Influence.
  • the resource #2 reserved by UE-x coincides with the resource #1 selected by UE-1, and the CPE #2 corresponding to the resource #2 reserved by UE-x
  • the length is smaller than the length of CPE#1 corresponding to resource #1 reserved by UE-1. If UE1 continues to transmit on this time slot, the transmission of UE1 will affect the business of UE-x in the RB set (for example, 20MHz) Transmission, that is, the transmission of UE-x will be affected by the inter-UE blocking of UE-1.
  • the resource selection process does not consider the impact of CPE length on transmission.
  • the resources selected by the terminal equipment may be blocked by the transmission of adjacent channels, or block the transmission of adjacent channels, reducing user services. experience and transmission performance.
  • this application provides a communication method and device.
  • the first terminal device compares the CPE lengths corresponding to different reservation resources according to the perceived reservation message, and then determines whether Perform resource reselection (that is, update the conditions for resource reselection based on the CPE length), or adjust the first CPE length used for transmission.
  • This method can target different terminal devices Prepare reservations for the same resource, avoid collision of resources selected by different terminal devices, ensure the transmission efficiency of terminal devices, improve spectrum utilization, and ensure user service transmission and experience.
  • At least one means one or more, and “more than one” means two or more.
  • “And/or” describes the association relationship of associated objects, indicating that three relationships may exist.
  • a and/or B can mean: A exists alone, A and B exist at the same time, and B exists alone, where A and B can be singular or plural.
  • the character “/” generally indicates that the associated objects before and after are in an "or” relationship.
  • “At least one of the following" or similar expressions refers to any combination of these items, including any combination of single or plural items.
  • At least one of a, b and c can mean: a, or b, or c, or a and b, or a and c, or b and c, or a, b and c.
  • a, b and c can be single or multiple, respectively.
  • first”, “second” and various numerical numbers indicate distinctions made for ease of description and are not used to limit the scope of the embodiments of the present application. For example, to distinguish between different messages, etc., rather than to describe a specific order or sequence. It should be understood that the objects described in this way can be interchanged where appropriate so as to be able to describe solutions other than the embodiments of the present application.
  • for instructions may include for direct instructions and for indirect instructions.
  • indication information when describing that certain indication information is used to indicate A, it may include that the indication information directly indicates A or indirectly indicates A, but it does not mean that the indication information must carry A.
  • the instruction methods involved in the embodiments of this application should be understood to cover various methods that can enable the party to be instructed to obtain the information to be instructed.
  • the information to be instructed can be sent together as a whole, or can be divided into multiple sub-information and sent separately, and the sending cycle and/or sending timing of these sub-information can be the same or different. This application does not limit the specific sending method.
  • the "instruction information" in the embodiment of this application may be an explicit indication, that is, a direct indication through signaling, or may be obtained based on parameters indicated by signaling, combined with other rules or other parameters, or obtained through derivation. It can also be an implicit indication, that is, obtained based on rules or relationships, or based on other parameters, or derivation. This application does not specifically limit this.
  • protocol may refer to a standard protocol in the field of communications, such as 5G protocol, new radio (NR) protocol and related protocols used in future communication systems, which are not limited in this application.
  • Pre-configuration may include pre-definition. For example, protocol definition. Among them, “pre-definition” can be implemented by pre-saving the corresponding code, table or other methods that can be used to indicate relevant information in the device, and this application does not limit its specific implementation method.
  • storage may refer to saving in one or more memories.
  • the one or more memories may be a separate device, or may be integrated in an encoder or decoder, a processor, or a communication device.
  • the one or more memories may also be partially provided separately and partially integrated in the decoder, processor, or communication device.
  • the type of memory can be any form of storage medium, and this application is not limited thereto.
  • the "first terminal device” can be described as “UE1”
  • the “second terminal device” can be described as “UE2”, and so on, which is no longer emphasized in this application.
  • FIG 4 is a schematic flowchart of the communication method 400 provided by the embodiment of the present application. As shown in Figure 4, the method includes the following steps.
  • the first terminal device receives the reservation message.
  • the reservation message indicates the second resource reserved by the second terminal device.
  • the first terminal device may receive the reservation message from the second terminal device, or the first terminal device may receive the reservation message from the network device, that is, the reservation message is forwarded by the network device.
  • this application does not limit the method by which the first terminal device obtains the reservation message.
  • UE1 senses, monitors, or receives the reservation message sent by UE2.
  • the reservation message of UE2 may explicitly or implicitly indicate the second resource reserved by UE2.
  • the second resources include but are not limited to: reservation interval information, frequency domain resource information, time domain resource information, and priority information.
  • the reservation interval information may be periodic reservation interval information; frequency domain resource information is used to indicate the reserved frequency domain resource location, including: starting frequency domain location and occupied frequency domain resource size and other information, such as frequency domain resources
  • the information includes one or more of the following information: transmitting PSCCH and/or PSSCH in an interleaved manner, the starting position of the interleave, the number of interleaves, transmitting PSCCH and/or PSSCH in a non-interleaved (such as sub-channel) manner; time domain
  • the resource information is used to indicate the reserved time domain resource location.
  • the time domain resource information includes one or more of the following information: transmitting one or more initial transmissions and/or retransmissions on multiple time slots, one or more Information on the time interval of initial transmission and/or retransmission, information on one or more initial transmissions and/or retransmissions, and number of initial transmissions and/or retransmissions on consecutive time slots; priority information includes priority or CAPC, etc.
  • this application does not specifically limit the number of reservation messages and the number of terminal devices that send reservation messages. That is, there can be one or more reservation messages.
  • the multiple reservation messages may be sent by the same terminal device to indicate multiple resources reserved by the terminal device; or the multiple reservation messages may also be sent by different terminal devices. Used to indicate the resources reserved by each terminal device, etc.
  • S420 The first terminal device determines the second CPE length according to the reservation message.
  • the second CPE length corresponds to the second resource.
  • the first terminal device determines the second CPE length according to the reservation message.
  • the first terminal device may determine the second CPE length according to the priority of transmission corresponding to the second resource; or the first terminal device may determine the second CPE length according to the reservation message.
  • the length of the CPE occupied by the message determines the length of the second CPE.
  • the priority of transmission here includes but is not limited to: priority or CAPC.
  • the terminal device can send a CPE to seize the channel before accessing the channel.
  • the specific length of time to seize can be related to the CAPC value and/or the value of the physical layer priority, and can be specified according to the standard. , can also be implemented internally by the first terminal device.
  • the second CPE length corresponds to the second resource. It can be understood that the second CPE length is transmitted on the gap symbol of the previous time unit, and the current time unit is used for the transmission of the second resource.
  • the time unit in this application may include but is not limited to: time slot, symbol, or micro-slot, etc., indicating the length of transmission (or transmission duration), such as 1 ms.
  • time slot indicating the length of transmission (or transmission duration), such as 1 ms.
  • the first terminal device determines the third resource or adjusts the first CPE length according to the first CPE length and the second CPE length.
  • the first CPE length is determined according to the priority of the first transmission of the first terminal device, and the first CPE length corresponds to the first resource.
  • the first resource is the resource that the first terminal device has selected for the first transmission.
  • the first resource overlaps with at least part of the time domain resources of the second resource, and part or all of the third resource is used for the first terminal device to perform the first transmission.
  • the first transmission of the first terminal device corresponds to the first CPE length
  • the second transmission of the second terminal device corresponds to the second CPE length
  • the first CPE length corresponds to the first resource. It can be understood that the first CPE length is transmitted on the gap symbol of the previous time slot, and the current time slot is used for the transmission of the first resource.
  • the first CPE length and the second CPE length affect each other. For example, when the first CPE length is smaller than the second CPE length, if the first terminal device still transmits according to the first CPE length, the LBT of the first terminal device will not be able to pass, thereby blocking the transmission of the first terminal device. Therefore, the first terminal device can exclude the resources on time slot m, and there is a determined third resource.
  • the third resource in the physical layer protocol actually refers to the candidate resource used by the first terminal device to perform the first transmission.
  • the first terminal device needs to report to the MAC layer and further perform resource selection at the MAC layer. That is, some or all of the resources are selected from the third resources for the first terminal device to perform the first transmission.
  • the CPE length corresponding to the reserved resource is compared for different application scenarios, and the specific implementation method of the first terminal device determining the third resource is explained in detail.
  • the first terminal device determines the third resource.
  • the first resource selected by UE1 is located in time slot m.
  • UE1 performs reservation emptiness and re-evaluation checks at time m-T3, and senses that the second resource reserved by UE2 is also located in this time slot m.
  • the bandwidth of the RB set can be 20MHz, a certain preset value, or a certain configuration value. For example, if the RB set includes 4 sub-channels, the bandwidth of each sub-channel is 5MHz. If the length of the second CPE corresponding to the second resource is greater than the length of the first CPE corresponding to the first resource, UE1's transmission will be affected by UE2's inter-UE blocking.
  • the first CPE length will be used. LBT will not be able to pass when seizing the channel, so UE1 needs to trigger resource reselection to obtain the third resource. For example, UE1 does not use the first resource on the time slot m to perform the first transmission. It should be understood that since the length of the first CPE is smaller than the length of the second CPE, UE1 does not need to consider the RSRP restriction of the reservation message in this method.
  • the scenario of empty reservation and re-evaluation check can refer to existing standards, such as when the priority of the first transmission of the first terminal device is lower than the priority of the transmission corresponding to the second resource reserved by the second terminal device. ; Or when the priority of the first transmission of the first terminal device is lower than a certain priority threshold, and the priority of the transmission of the second terminal device is higher than the priority threshold.
  • the first CPE length may be the longest CPE length corresponding to all reserved resources in the time slot m perceived by UE1. That is to say, the first CPE length is the one corresponding to the highest priority in the time slot m. level transmission.
  • the first terminal device determines the third resource.
  • the first resource selected by UE1 is located in time slot m.
  • UE1 performs reservation emptiness and re-evaluation checks at time m-T3, and senses that the second resource reserved by UE2 is also located in this time slot m.
  • the bandwidth of the RB set can be 20MHz, a certain preset value, or a certain configuration value.
  • the RB set includes 4 sub-channels, and the bandwidth of each sub-channel is 5 MHz.
  • the frequency domain resources of the first resource correspond to sub-channel 0 and sub-channel 1
  • the second resource corresponds to sub-channel 1 and sub-channel 2.
  • the second CPE length corresponding to the second resource reserved by UE2 in this time slot m is greater than the first CPE length corresponding to the first resource selected by UE1, then UE1's transmission will be affected by UE2's inter-UE blocking. If UE1 continues Occupying this time slot m, LBT will not be able to pass when using the first CPE length to seize the channel, so UE1 needs to trigger resource reselection to obtain the third resource. For example, UE1 does not use the first resource on the time slot m to perform the first transmission. There are partially overlapping frequency domain resources (for example, subchannel 1) between the first resource and the second resource. It should be understood that since the length of the first CPE is smaller than the length of the second CPE, UE1 does not need to consider the RSRP restriction of the reservation message in this method.
  • the first terminal device determines the third resource.
  • the first resource selected by UE1 is located in time slot m.
  • UE1 performs reservation emptiness and re-evaluation checks at time m-T3, and senses that the second resource reserved by UE2 is also located in this time slot m.
  • the bandwidth of the RB set can be 20MHz, a certain preset value, or a certain configuration value. If the second CPE length corresponding to the second resource reserved by UE2 in this time slot m is equal to the first CPE length corresponding to the first resource selected by UE1, then UE1 and UE2 can use the resources in this time slot m for transmission at the same time, and There will be no obstruction to each other.
  • UE1 needs to trigger resource reselection to obtain the third resource. For example, UE1 does not use the first resource on the time slot m to perform the first transmission.
  • the CPE length corresponding to the reserved resource is compared for different application scenarios, and the specific implementation method of the first terminal device adjusting the first CPE length is explained in detail. .
  • the first terminal device adjusts the first CPE length of the first terminal device in the first time unit to the third CPE length according to the first CPE length and the second CPE length.
  • the first time unit It is the time domain resource of the overlapping portion of the first resource and the second resource, and the length of the third CPE is greater than or equal to the length of the second CPE.
  • the first terminal device adjusting the first CPE length in the first time unit refers to the first terminal device adjusting the first CPE length corresponding to the reserved first resource in the first time unit, wherein the first CPE length is in the first time unit. Transmitted on the gap symbol of the previous time slot of the time unit.
  • the first resource selected by UE1 is located in time slot m (i.e., the first time unit).
  • UE1 performs reservation emptiness and re-evaluation checks at time m-T3, and senses that the second resource reserved by UE2 is also located at this time.
  • the bandwidth of the RB set may be 20 MHz, a certain preset value, or a certain configuration value. If UE2 reserves the time slot m
  • the second CPE length corresponding to the second resource is greater than the first CPE length corresponding to the first resource selected by UE1, then UE1's transmission will be affected by UE2's inter-UE blocking.
  • the length of the third CPE is greater than the length of the second CPE. If UE1 senses that only one UE (for example, UE2) reserves resources on this time slot m for transmission, UE1 may perform the first transmission on this time slot m. , but it will cause blocking of UE2's transmission.
  • the length of the third CPE is equal to the length of the second CPE. If UE1 senses that only one UE (for example, UE2) reserves resources on this time slot m for transmission, then UE1 and UE2 can transmit on this time slot m at the same time. Transmission will not cause transmission blockage to each other, ensuring user transmission efficiency and improving spectrum utilization.
  • UE2 senses that only one UE (for example, UE2) reserves resources on this time slot m for transmission, then UE1 and UE2 can transmit on this time slot m at the same time. Transmission will not cause transmission blockage to each other, ensuring user transmission efficiency and improving spectrum utilization.
  • the first resource selected by UE1 is located in time slot m (i.e., the first time unit).
  • UE1 performs reservation emptiness and re-evaluation checks at time m-T3, and senses that the second resource reserved by UE2 is also located at this time.
  • the bandwidth of the RB set can be 20MHz, a certain preset value, or a certain configuration value. If the second CPE length corresponding to the second resource reserved by UE2 in this time slot m is less than the first CPE length corresponding to the first resource selected by UE1, then UE2's transmission will be affected by UE1's inter-UE blocking.
  • UE1 The resources on the time slot m can continue to be occupied for the first transmission, and the length of the first CPE is not adjusted. Alternatively, UE1 can also shorten the first CPE length to the third CPE length to ensure that UE2 can transmit in this time slot m.
  • the length of the third CPE is smaller than the length of the second CPE. If UE1 senses that only one UE (for example, UE2) reserves the resources in this time slot m for transmission, then UE2 can transmit in this time slot m, but This will cause blocking of UE1's transmission.
  • UE2 senses that only one UE (for example, UE2) reserves the resources in this time slot m for transmission, then UE2 can transmit in this time slot m, but This will cause blocking of UE1's transmission.
  • the length of the third CPE is equal to the length of the second CPE. If UE1 senses that only one UE (for example, UE2) reserves resources on this time slot m for transmission, then UE1 and UE2 can transmit on this time slot m at the same time. Transmission will not cause transmission blockage to each other, ensuring user transmission efficiency and improving spectrum utilization.
  • UE2 senses that only one UE (for example, UE2) reserves resources on this time slot m for transmission, then UE1 and UE2 can transmit on this time slot m at the same time. Transmission will not cause transmission blockage to each other, ensuring user transmission efficiency and improving spectrum utilization.
  • the method further includes: the first terminal device determines a fourth CPE length according to the reservation message, the fourth CPE length corresponds to the fourth resource, and the fourth CPE length is greater than the second CPE length. Further, the first terminal device adjusts the first CPE length of the first terminal device on the first time unit to the third CPE length according to the first CPE length, the fourth CPE length and the second CPE length, and the first time unit is For the time domain resources of the overlapping portion of the first resource and the second resource, the third CPE length is greater than or equal to the fourth CPE length.
  • first resource and the second resource (or the fourth resource) in this implementation do not overlap in the frequency domain.
  • the first resource selected by UE1 is located in time slot m (i.e., the first time unit).
  • UE1 performs reservation emptiness and re-evaluation checks at time m-T3, and senses that the second resource reserved by UE2 is also located at this time.
  • the bandwidth of the RB set can be 20MHz, a certain preset value, or a certain configuration value. If the length of the fourth CPE corresponding to the fourth resource reserved by UE4 in this time slot m is greater than the length of the first CPE corresponding to the first resource selected by UE1, then UE1's transmission will be affected by UE4's inter-UE blocking. If UE1 continues Occupying this time slot m, LBT will not be able to pass when using the first CPE length to seize the channel, so UE1 needs to increase the first CPE length to the third CPE length.
  • the length of the third CPE is greater than the length of the fourth CPE. If UE1 senses that multiple UEs (for example, UE2 and UE4) reserve resources on this time slot m, UE1 may perform the first operation on this time slot m. transmission, but it will cause blocking of the transmission of UE2 and UE4.
  • multiple UEs for example, UE2 and UE4
  • the third CPE length is equal to the fourth CPE length. If UE1 senses that multiple UEs (for example, UE2 and UE4) reserve resources in this time slot m, then UE1 and UE4 can reserve resources in this time slot m at the same time. Transmission will not cause transmission congestion to each other, but will cause transmission congestion to UE2.
  • multiple UEs for example, UE2 and UE4
  • the fourth CPE length may be the longest of the CPE lengths corresponding to all reserved resources in the time slot m perceived by UE1.
  • the first resource selected by UE1 is located in time slot m (i.e., the first time unit).
  • UE1 performs reservation emptiness and re-evaluation checks at time m-T3, and senses that the second resource reserved by UE2 is also located at this time.
  • the bandwidth of the RB set may be 20 MHz, a certain preset value, or a certain configuration value. If the length of the fourth CPE corresponding to the fourth resource reserved by UE4 is less than the length of the first CPE corresponding to the first resource selected by UE1, UE4's transmission will be affected by UE1's inter-UE blocking. At this time, UE1 can continue to occupy the time.
  • the first transmission is performed in slot m, and the length of the first CPE is not adjusted. Alternatively, UE1 may also shorten the first CPE length to the third CPE length.
  • the length of the third CPE is less than the length of the fourth CPE. If UE1 senses that multiple UEs (for example, UE2 and UE4) reserve resources on this time slot m for transmission, UE4 can perform transmission on this time slot m. transmission, but it will cause blocking of UE1's transmission. It should be understood that regardless of the relationship between the length of the third CPE and the length of the second CPE, the transmission of UE4 will cause blocking of the transmission of UE2.
  • the length of the third CPE is equal to the length of the second CPE. If UE1 senses that multiple UEs (for example, UE2 and UE4) reserve resources in this time slot m for transmission, then UE1 and UE4 can transmit in this time slot m at the same time. m will not cause transmission blockage to each other, but will cause blockage to UE2's transmission.
  • UEs for example, UE2 and UE4
  • this application does not specifically limit the implementation methods of UE1 to perform space reservation and re-evaluation checks and adjust the length of the first CPE. For example, taking as an example to avoid the transmission of UE1 being blocked by the transmission of other UEs, the method of adjusting the length of the first CPE by UE1 will be described.
  • UE1 after sensing all reservation messages in the time slot m, UE1 compares the CPE lengths corresponding to the resources reserved by all reservation messages, and determines the CPE corresponding to the highest priority of transmission indicated by a certain reservation message.
  • the length is the fourth CPE length
  • UE1 can directly increase the first CPE length to the third CPE length, and the third CPE length is greater than or equal to the fourth CPE length, ensuring that UE1 can perform the first transmission on this time slot m.
  • each time UE1 senses a reservation message on time slot m, it determines the CPE length corresponding to the resource reserved by the reservation message, compares the CPE length with the first CPE length, and then determines the current CPE length. Secondly, it is sensed whether the length of the first CPE needs to be adjusted.
  • UE1 when sensing that the second CPE length is greater than the first CPE length, UE1 can adjust (increase) its first CPE length to the second CPE length; then, after sensing that the fifth CPE length is shorter than UE1's current In the case of the adjusted CPE length, UE1 continues to maintain the current adjusted CPE length; further, when it senses that the length of the fourth CPE is greater than the current adjusted CPE length of UE1, UE1 can change its current adjusted CPE length. The length is adjusted (increased) to a third CPE length, which is greater than or equal to the fourth CPE length. And so on, until the reservation is empty and re-evaluation checks all the reservation messages in the time slot m. At this time, the CPE length of UE1 has been adjusted to the longest CPE length in time slot m, ensuring that UE1 can perform the first transmission in time slot m.
  • the first terminal device when the length of the first CPE is greater than or less than the length of the second CPE, and the RSRP of the reservation message is lower than the first threshold, the first terminal device adjusts the first time unit in the first time unit.
  • the first CPE length is the third CPE length.
  • first resource and the second resource in this implementation are at least partially overlapped in the frequency domain.
  • the first resource selected by UE1 is located in time slot m (that is, the first time unit), and the second CPE length is the longest CPE length corresponding to the resources reserved by all reservation messages on time slot m.
  • UE1 is in m -Reservation empty and re-evaluation checks are performed at time T3. Assume that the first resource and the second resource are located in the same RB set.
  • the bandwidth of the RB set can be 20MHz, a certain preset value, or a certain configuration value.
  • UE1 If UE1 senses that the second CPE length is greater than the first CPE length, at least part of the frequency domain resources of the first resource and the second resource overlap, and the RSRP of the reservation message is lower than the first threshold, then UE1 can follow the second CPE length (or greater than the length of the second CPE), this can prevent UE1's transmission from being blocked by UE2's transmission; if UE1 senses that the second CPE length is less than the first CPE length, and the RSRP of the reservation message is lower than the first threshold, UE1 can follow Transmission is performed with the second CPE length (or less than the second CPE length), so as to prevent the transmission of UE1 from blocking the transmission of UE2.
  • the first terminal device adjusts the time at the first time.
  • the first CPE length on the unit is the third CPE length.
  • the length of the third CPE is greater than or equal to the length of the second CPE. It should be pointed out that the non-overlapping frequency domain resources of the first resource and the second resource here means that the frequency domain resources of the first resource and the second resource do not overlap at all.
  • the first resource selected by UE1 is located in time slot m (that is, the first time unit), and the second CPE length is the longest CPE length corresponding to the resources reserved by all reservation messages on time slot m.
  • UE1 is in m -Reservation empty and re-evaluation checks are performed at time T3. Assume that the first resource and the second resource are located in the same RB set.
  • the bandwidth of the RB set can be 20MHz, a certain preset value, or a certain configuration value.
  • UE1 can transmit according to the second CPE length (or greater than the second CPE length), so that It can prevent UE1's transmission from being blocked by UE2's transmission; if UE1 senses that the second CPE length is less than the first CPE length, and the frequency domain resources of the first resource and the reserved resource do not overlap at all, UE1 can follow the second CPE length ( or less than the length of the second CPE) can prevent the transmission of UE1 from blocking the transmission of UE2.
  • the application scenario of this implementation means that the first terminal device has selected the first resource for the first transmission. By sensing, monitoring, or receiving reservation messages from other terminal devices, it is determined that the resources reserved by other terminal devices overlap with the time slot of the first resource selected by the first terminal device, that is, the time domain resources of the first resource and the second resource overlap. Partially or completely coincident, such as the current time slot.
  • the first terminal device performs resource reselection (that is, determines the third resource) or adjusts the length of the first CPE by comparing the length of the first CPE with the lengths of other perceived CPEs, and then determines whether to continue to occupy different CPE lengths.
  • the terminal device performs the first transmission in the same time slot reserved by the terminal device to avoid the transmission of the first terminal device from being blocked by the transmission of other terminal devices (or to prevent the transmission of the first terminal device from blocking the transmission of other terminal devices) and improve the performance of the first terminal device. transmission efficiency and avoid unnecessary waste of spectrum resources.
  • the first terminal device introduces the CPE length as a condition for re-selecting resources, or adjusts the first CPE length to improve the utilization of spectrum resources and ensure the transmission performance of the terminal device.
  • the communication method 400 provided above is illustrated below with reference to FIG. 5 .
  • FIG. 5 is a schematic diagram of the results of space reservation and re-evaluation check provided by the embodiment of the present application.
  • the sensing window is before time slot n
  • the resource selection window is after time slot n.
  • UE1 senses that the resources on sub-channel 0 and sub-channel 1 are respectively used by UE2 Reservation with UE3, and UE1 does not sense that sub-channel 2 and the resources on the sub-channel are reserved, so in order to avoid transmission blocking between UEs, UE1 selects resource #1 for the first transmission (the corresponding CPE length is CPE#1 ), can be located in the corresponding sub-channel 3 and sub-channel 2 on time slot m.
  • subchannel 2 and subchannel 3 can be understood as: the frequency domain resources of resource #1 selected by UE1 for the first transmission. It should be understood that before UE1 performs the first transmission, UE1 needs to perform a reservation and re-evaluation check at time m-T3. As shown in (b) of Figure 5, UE1 senses, monitors, or receives other UEs (such as UE2 , UE3, UE4 and UE5), it is determined that UE2, UE3 and UE4 have simultaneously reserved resources on time slot m in the resource selection window, and the resources reserved by UE2, UE3 and UE4 are in the frequency domain of this time slot m. The resources correspond to subchannel 0, subchannel 1 and subchannel 2 respectively.
  • the resources reserved by UE4 appear every 3 time slots.
  • the resources reserved by UE2, UE3 and UE4 in the resource selection window are respectively called resource #2, resource #3 and resource #4, and the corresponding CPE lengths are CPE#2, CPE#3 and CPE# respectively. 4.
  • CPE#2, CPE#3 and CPE#4 are respectively transmitted on the last gap symbol on the m-1 timeslot. For example, if the RB set on this time slot m is 20MHz, then each sub-channel is 5MHz.
  • the transmission priority of each resource in this time slot m is UE#2, UE#4 and UE#3 from high to low, and the corresponding CPE length is CPE#2, CPE#4 and CPE# from long to short. 3.
  • UE1 can perform resource reselection by comparing different CPE lengths.
  • UE1 performs resource reselection and may not select the resources on time slot m for the first transmission; alternatively, UE1 may increase CPE#1 to CPE#2, so that UE1 and UE2 can transmit on time slot m at the same time, thereby preventing the transmission of UE1 and UE2 from being blocked by the transmission of other UEs, but blocking the transmission of UE3 and UE4; alternatively, UE1 may increase CPE#1 to CPE#5, where CPE#5 is larger than CPE#2. In this case, UE1 can use the time slot m for the first transmission, but will block the transmission of UE2, UE3 and UE4.
  • CPE#1 is larger than CPE#2, UE1 can continue to occupy this time slot m for the first transmission, but it will block the transmission of UE2, UE3 and UE4; or, UE1 can shorten CPE#1 to CPE# 2. This allows UE1 and UE2 to transmit on the time slot m at the same time to prevent UE1 and UE2 from being blocked by the transmissions of other UEs.
  • UE1 performs resource reselection. For example, UE1 may not select resources on the time slot m (or subchannel 2 on the time slot m) for the first transmission.
  • FIG. 6 is a schematic flowchart of the communication method 600 provided by the embodiment of the present application. As shown in Figure 6, the method includes the following steps.
  • the first terminal device receives the reservation message.
  • the reservation message indicates the second resource reserved by the second terminal device.
  • the first terminal device may receive the reservation message from the second terminal device, or the first terminal device may receive the reservation message from the network device, that is, the reservation message is forwarded by the network device.
  • this application does not limit the method by which the first terminal device obtains the reservation message.
  • this application does not specifically limit the number of reservation messages and the number of terminal devices that send reservation messages. That is, there can be one or more reservation messages.
  • the multiple reservation messages may be sent by the same terminal device to indicate multiple resources reserved by the terminal device; or the multiple reservation messages may also be sent by different terminal devices. used to refer to Displays the resources reserved by each terminal device, etc.
  • S620 The first terminal device determines the second CPE length according to the reservation message.
  • the second CPE length corresponds to the second resource
  • the first terminal device determines the second CPE length according to the reservation message, which may be that the first terminal device determines the second CPE length according to the priority (for example, priority or CAPC) of the transmission corresponding to the second resource; or, it may also be The first terminal device determines the second CPE length based on the CPE length occupied by the reservation message.
  • priority for example, priority or CAPC
  • the priority of transmission here includes but is not limited to: priority or CAPC.
  • the second CPE length corresponds to the second resource.
  • the second CPE length may be transmitted on the gap symbol of the previous time slot, and the current time slot is used for the transmission of the second resource.
  • different transmission priorities correspond to different CPE lengths. For example, the first transmission of the first terminal device corresponds to the first CPE length, and the second transmission of the second terminal device corresponds to the second CPE length.
  • the candidate resource set can be understood as the candidate resources selected by the first terminal device from the resource pool for the first transmission.
  • This candidate resource set needs to be reported to the MAC layer for further processing at the MAC layer.
  • Resource selection That is to say, after resource selection at the MAC layer, some or all of the resources in the candidate resource set can be used by the first terminal device to perform the first transmission.
  • steps S610 and S620 of this implementation method can refer to steps S410 and S420 of the above method 400 respectively, and for the sake of brevity, they will not be repeated here.
  • the first terminal device determines a candidate resource set according to the first CPE length and the second CPE length.
  • part or all of the resources of the candidate resource set are used for the first terminal device to perform the first transmission, and the first CPE length is determined according to the priority of the first transmission of the first terminal device.
  • the first terminal device when the length of the first CPE is less than the length of the second CPE, the first terminal device excludes the third resource to obtain a candidate resource set, and the third resource is the frequency in the time unit where the second resource is located. domain resources.
  • the third resource is a frequency domain resource in the time unit where the second resource is located, including: the third resource is part or all of the frequency domain resource in the time unit where the second resource is located.
  • the third resource may be a resource within the RB set on the time unit, such as the frequency domain resources corresponding to sub-channel 0 and sub-channel 1; or the third resource may also be a resource within a certain frequency domain range on the time unit. resource.
  • the bandwidth of the RB set can be 20MHz, a certain preset value, or a certain configuration value.
  • the first terminal device may preferentially select one or more of the following resources as a candidate resource set: frequency domain resources without reservation on nearby sub-channels (for example, sub-channel 2 and sub-channel 3), or the CPE length is less than The reservation resource #1 corresponding to the first CPE length, or the CPE length is equal to the reservation resource #2 corresponding to the second CPE length.
  • the RSRP value of the reservation message corresponding to the reservation resource #2 is lower than the first threshold.
  • the above-mentioned first terminal device excludes third resources to obtain a candidate resource set, and includes the above-mentioned preferred resources into the candidate resource set. It can be used independently, that is, the first terminal device only performs the action of excluding resources or performs the inclusion of resources. action, or it can also be used in combination, that is, the first terminal device simultaneously excludes third resources that do not meet the conditions, and uses resources that meet the transmission conditions as candidate resources, which is not specifically limited in this application.
  • the second CPE length may be the longest CPE length corresponding to all reservation resources on the same time slot m as perceived by UE1; or the second CPE length may not be the longest on the time slot m.
  • the CPE length is not specifically limited in this application.
  • UE1 perceives that the second resource reserved by UE2 is located in time slot m, and the second CPE length corresponding to the second resource is greater than the first CPE length. If UE1 is in time slot m, transmission, the transmission of UE1 will be affected by the inter-UE blocking of UE2, causing transmission blocking to UE1. Therefore, UE1 can exclude part or all of the frequency domain resources in this time slot m to obtain candidate resources.
  • the frequency domain resources of the second resource are located on sub-channel 0 and sub-channel 3 (that is, the third resource) on the time slot m
  • UE1 can exclude all time-frequency resources on the time slot m, that is, the candidate resource set does not include the time slot m where the second resource is located; or UE1 can also exclude sub-channel 0 and sub-channel on the time slot m.
  • the candidate resource set includes the frequency domain resources of other subchannels on the time slot m, such as the frequency domain resources of subchannel 1 and/or subchannel 2.
  • Figure 7 is a schematic diagram of resource selection provided by an embodiment of the present application. As shown in Figure 7, the time slot n is preceded by the sensing window, and the time slot n is followed by the resource selection window. UE1 determines that UE2 and UE3 are in There are reserved resources in the resource selection window. The resource reserved by UE2 is located in sub-channel 1 on time slot n+5. The reserved resource by UE3 The approximately resources are located in sub-channel 2 on time slot n+3 and time slot n+9. For example, if the RB set on each time slot is 20MHz, then each sub-channel on each time slot is 5MHz.
  • the resources reserved by UE2 and UE3 in the resource selection window are respectively called resource #2 and resource #3, and the corresponding CPE lengths are CPE#2 and CPE#3 respectively. It should be understood that CPE#2 and CPE#3 are transmitted on the last gap symbols on slot n+4 and slot n+2 respectively.
  • UEl does not select resources corresponding to a CPE length greater than the first CPE length (which may be called CPE#1). For example, if CPE#3 is greater than CPE#1, the resources on time slot n+3 and time slot n+9 are not selectable, that is, the candidate resource set does not include time slot n+3 and time slot n+9.
  • UE1 can increase CPE#1 to CPE#3 (or even larger than CPE#3), then the resources on time slot n+3 and time slot n+9 are optional.
  • the resource on time slot n+5 is optional, that is, the candidate resource set includes time slot n+5.
  • UE#1 can perform the first transmission in time slot n+5 according to CPE#1. At this time, the transmission of UE#1 will cause the transmission of UE#2 to be blocked; alternatively, UE#1 can also perform the first transmission in time slot n+5 according to CPE#2. The first transmission is performed on time slot n+5. At this time, the transmissions of UE#1 and UE#2 will not block each other, which can ensure the transmission efficiency of the terminal equipment, improve spectrum utilization, and reduce transmission delay.
  • the first terminal device uses the fourth resource as a candidate resource set; wherein the fourth resource includes: For resources, the first time unit does not overlap with the time unit where the second resource is located; and/or, some or all resources on the time unit where the second resource is located.
  • the second CPE length may be the longest CPE length corresponding to all reserved resources on the same time slot m perceived by UE1.
  • UE1 perceives that the second resource reserved by UE2 is located in time slot m.
  • the first CPE length is greater than the second CPE length
  • all resources on the time slot m where the second resource corresponding to the second CPE length is located can be used as candidate resources, that is, UE1 can select or reserve all sub-channels on the time slot m for the first transmission; or, if UE1 When performing the first transmission based on the second CPE length, it is necessary to further consider the size of the RSRP of the reservation message #2 (which can determine the second CPE length) and the first threshold. If the RSRP of the reservation message is lower than the first threshold, then the The time slot m where the second resource corresponding to the second CPE length is located can be used as a candidate resource.
  • the UE1 may transmit the second CPE length.
  • the time slot m in which the resource is located is excluded from the candidate resource pool.
  • UE1 may also determine the fourth CPE length according to the perception message, the fourth CPE length corresponds to the fourth resource, and the fourth resource is the same as the time domain resource where the second resource is located (i.e., located in the same time slot m).
  • the fourth CPE length is the longest CPE length on the time slot m (i.e., the fourth CPE length is greater than the second CPE length) through the perception reservation message
  • the first CPE length is greater than the fourth CPE length
  • all resources on the time slot m where the fourth resource corresponding to the fourth CPE length is located can be used as candidate resources, that is, UE1 can select or reserve all sub-channels on the time slot m for the first transmission; or, if UE1 performs the first transmission according to the fourth CPE length, then it is necessary to further consider the RSRP of the reservation message #4 (which can determine the fourth CPE length) and the size of the first threshold.
  • the time slot m where the fourth resource corresponding to the fourth CPE length is located can be used as a candidate resource. For another example, when the first CPE length is greater than the fourth CPE length, if UE1 performs the first transmission according to the fourth CPE length and the RSRP of the reservation message #4 is higher than the first threshold, UE1 can exclude the time slot m where the fourth resource is located from the candidate resource pool.
  • FIG 8 is a schematic diagram of resource selection provided by an embodiment of the present application. As shown in Figure 8, the time slot n is preceded by the sensing window, and the time slot n is followed by the resource selection window.
  • UE1 determines the reservation of UE2 by sensing, monitoring, or receiving reservation messages from other UEs (such as UE2, UE3, UE4, and UE5).
  • the resources are located in sub-channel 0 in time slots n+4, n+5, n+8 and n+9.
  • the resources reserved by UE3 are located in sub-channel 1 in time slots n+5 and n+6.
  • the resources reserved by UE4 Subchannel 2 is located in time slot n+3 and time slot n+9, and the resources reserved by UE5 are located in subchannel 2 in time slots n+4 and n+7. For example, if the RB set on each time slot is 20MHz, then each sub-channel on each time slot is 5MHz.
  • the resources reserved by UE2, UE3, UE4 and UE5 in the resource selection window are respectively called resource #2, resource #3, resource #4 and resource #5.
  • the corresponding CPE lengths are CPE#2, CPE#3 and CPE respectively. #4 and CPE#5. It should be understood that CPE#2, CPE#3, CPE#4 and CPE#5
  • the corresponding resources are transmitted on the last gap symbol of the previous time slot in the time slot where the corresponding resources are located.
  • CPE#2 and CPE#4 are equal to CPE#1 of UE1, and CPE#2 is larger than CPE#3 and CPE#5. Then UE1 determines that the resource on time slot n+2 does not have any reservation by sensing all reservation messages on each time slot, that is, time slot n+2 is an unreserved time slot; resource #4 on time slot n+3
  • the corresponding CPE#4 is the longest, the CPE#2 corresponding to resource #2 on time slot n+4 is the longest, the CPE#2 corresponding to resource #2 on time slot n+5 is the longest, and the CPE#2 corresponding to resource #2 on time slot n+6 is the longest.
  • the CPE#3 corresponding to resource #3 on time slot n+7 is the longest
  • the CPE#5 corresponding to resource #5 on time slot n+7 is the longest
  • the CPE#2 corresponding to resource #2 on time slot n+8 is the longest
  • the CPE#2 on time slot n+8 is the longest.
  • the CPE#2 corresponding to resource #2 on n+9 and the CPE#4 corresponding to resource #4 are equal.
  • UE1 needs to select resources from time slots with the same CPE length or idle time slots. Since time slot n+6, time slot CPE#3 and CPE#5 corresponding to reserved resource #3 and resource #5 on n+7 are not equal to CPE#1, so UE1 needs to exclude the resources on time slot n+6 and time slot n+7, and other The resources on time slot n+2, time slot n+3, time slot n+4, time slot n+5, time slot n+8 and time slot n+9 can all be used as candidate resources for UE1 to perform the first transmission. Reported to the MAC layer.
  • UE1 adjusts (reduces) CPE#1 to CPE#3. At this time, if UE1 transmits according to CPE#3, time slot n+2 and time slot n+6 can be used as candidate resources; or, UE1 adjusts (reduces) CPE#1 to CPE#5. At this time, if UE1 transmits according to CPE#5, time slot n+2 and time slot n+7 can be used as candidate resources.
  • the first terminal device when the first CPE length is equal to the second CPE length, and the received power RSRP of the reference signal of the reservation message is higher than the first threshold, the first terminal device excludes at least one connection with the second resource. For partially overlapping resources, a candidate resource set is obtained.
  • UE1 will exclude resources in the second resource that partially or completely overlap with the first resource in time-frequency resources, and the RSRP of the reservation message is greater than the first threshold.
  • the first terminal device may use the fourth resource as a candidate resource set; where the fourth resource includes: Resources on the first time unit that do not overlap with the time unit where the second resource is located, that is, resources on the time unit that have not been reserved; and/or some or all of the resources on the time unit where the second resource is located .
  • the second CPE length may be the longest CPE length corresponding to all reserved resources on the same time slot m perceived by UE1.
  • UE1 perceives that the second resource reserved by UE2 is located in time slot m.
  • the length of the first CPE is equal to the length of the second CPE, it can follow the existing R16/R17 process.
  • Resource selection is performed based on the size of the RSRP of the reservation message and the first threshold. For example, if UE1 determines that the RSRP of the reservation message of the second CPE length is higher than the first threshold, then UE1 excludes the resources in the time slot m where the second resource corresponding to the second CPE length is located.
  • UE1 perceives that the second resource reserved by UE2 is located in time slot m.
  • the first CPE length is equal to the second CPE length
  • UE1 determines the reservation message of the second CPE length, RSRP is lower than the first threshold, then UE1 can use the resource in the time slot m where the second resource corresponding to the second CPE length is located as a candidate resource.
  • time slot m when there are multiple reservation messages and the resources reserved are all in time slot m, UE1 needs to traverse all the reservation messages in this time slot m and finally determine the candidate resources. The upper part of time slot m may appear. The resource is repeatedly reported to the MAC as a candidate resource. For example, there are three reservation messages that simultaneously reserve resources on time slot m.
  • UE1 After UE1 senses reservation message #1, it determines that resource #1 is: sub-channel 0 and sub-channel 2 on time slot m; further, UE1 After sensing reservation message #2, it determines that resource #2 is: all resources on time slot m (including sub-channel 0 ⁇ sub-channel 3); finally, after sensing reservation message #3, UE1 determines that resource #3 is: time slot Subchannel 0, subchannel 1 and subchannel 3 on m. Based on the sensing results of all reservation messages in this time slot m, UE1 can report the resources shared by resource #1, resource #2 and resource #3 as candidate resources to the MAC layer. For example, the resource corresponding to sub-channel 0 on time slot m.
  • time slot m there may be a fifth resource among all the reserved resources perceived by UE1, and the length of the fifth CPE corresponding to the fifth resource is less than the length of the second CPE (the reserved resource in this time slot m The corresponding longest CPE length), that is, the fifth resource is smaller than the first CPE length.
  • UE1 may consider the RSRP of the reservation message corresponding to the second CPE length and the size of the first threshold when the first CPE length is equal to the second CPE length, and then determine the candidate resources.
  • UE1 does not need to compare the size between the RSRP of the reservation message corresponding to the fifth CPE length and the first threshold, and can use the fifth resource as a candidate resource.
  • the relationship between the RSRP of the reservation message and the first threshold needs to be compared, and when the RSRP of the reservation message is higher In the case of the first threshold, the second resource is excluded.
  • UE1 when the first CPE length is equal to the second CPE length and the received power RSRP of the reference signal of the reservation message is higher than the first threshold, considering the in-band leakage (Inter-band emission, IBE) problem, UE1 You can preferentially select one or more of the following resources as a candidate resource set: Assume that UE2 reserves the frequency domain resources corresponding to sub-channel 1 and sub-channel 0 on time slot m, UE1 can select nearby sub-channels on time slot m There are no reserved frequency domain resources (for example, sub-channel 3); or, UE1 selects the reserved resource whose CPE length is smaller than the first CPE length; or, UE1 selects the reserved resource #2, whose CPE length is equal to the second CPE length. When the RSRP value of the reservation message corresponding to reservation resource #2 is lower than the first threshold.
  • FIG9 is a schematic diagram of resource selection provided by an embodiment of the present application.
  • the window before time slot n is a perception window
  • the window after time slot n is a resource selection window.
  • UE1 determines that the resources reserved by UE2 are located in subchannel 0 on time slots n+4, n+5, n+8, and n+9, the resources reserved by UE3 are located in subchannel 1 on time slots n+5 and n+6, the resources reserved by UE4 are located in subchannel 2 on time slots n+3 and n+9, and the resources reserved by UE5 are located in subchannel 2 on time slots n+4 and n+7 by sensing, monitoring, or receiving reservation messages from other UEs (such as UE2, UE3, UE4, and UE5).
  • UE2 determines that the resources reserved by UE2 are located in subchannel 0 on time slots n+4, n+5, n+8, and n+9
  • the resources reserved by UE3 are located
  • each subchannel on each time slot is 5MHz.
  • the resources reserved by UE2, UE3, UE4, and UE5 in the resource selection window are respectively referred to as resource #2, resource #3, resource #4, and resource #5, and the corresponding CPE lengths are CPE #2, CPE #3, CPE #4, and CPE #5, respectively. It should be understood that the resources corresponding to CPE#2, CPE#3, CPE#4 and CPE#5 are transmitted on the last gap symbol of the previous time slot on the time slot where the resources are located.
  • CPE#2 is greater than CPE#4, CPE#4 is greater than CPE#1 of UE1, CPE#3 is less than CPE#1, and CPE#5 is equal to CPE#1, then UE1 senses all The reservation message confirms that there is no reservation for the resource on time slot n+2, that is, time slot n+2 is an unreserved time slot; the CPE#4 corresponding to resource #4 on time slot n+3 is the longest, and time slot n Resource #2 on +4 corresponds to the longest CPE#2, resource #2 on slot n+5 corresponds to the longest CPE#2, and resource #3 on slot n+6 corresponds to the longest CPE#3.
  • the CPE#5 corresponding to resource #5 on time slot n+7 is the longest
  • the CPE#2 corresponding to resource #2 on time slot n+8 is the longest
  • the CPE#2 corresponding to resource #2 on time slot n+9 #2 is the longest.
  • UE1 In order to prevent UE1's transmission from causing transmission congestion to other UEs, in this implementation, UE1 needs to select resources from time slots with short CPE lengths or idle time slots. Since CPE#4 is greater than CPE#1, the resources on time slot n+3 and time slot n+9 are not selectable; similarly, CPE#2 is greater than CPE#1, then time slot n+4 and time slot n+5 , sources on slot n+8 and slot n+9 are not selectable.
  • time slot n+6 Since CPE#3 is smaller than CPE#1, the resources in time slot n+6 can be selected; considering that CPE#5 is smaller than CPE#1, and the RSRP of the reservation message of UE5 is greater than the first threshold, so time slot n+7 The resources on are not selectable. In addition, time slot n+2 is used as an idle time slot, and the resources on this time slot n+2 are also optional.
  • UE1 needs to exclude resources on time slot n+3, time slot n+4, time slot n+5, time slot n+7, time slot n+8 and time slot n+9, and other time slots n+2 , and resources on time slot n+6 can be used as candidate resources for UE1 to perform the first transmission and reported to the MAC layer.
  • UE1 can transmit according to CPE#1 in time slot n+6 to ensure the transmission efficiency of UE1, but it will cause transmission blocking to UE3; or UE1 can also transmit according to CPE#3 in time slot n+6 to ensure the transmission efficiency of UE1 and UE3, and will not cause transmission blocking to each other. Similarly, UE1 can transmit according to CPE#1 in time slot n+7 to ensure the transmission efficiency of UE1, but it will cause transmission blocking to UE5.
  • the method further includes: when the candidate resource set cannot meet the first transmission requirement of the first terminal device, the first terminal device increases the first CPE length. Further, the first terminal device determines the candidate resource set according to the increased first CPE length and second CPE length.
  • the candidate resource set cannot meet the first transmission requirements of the first terminal device, including one or more of the following:
  • the number of time units where the candidate resources in the candidate resource set are located is lower than threshold #1; or,
  • the number of candidate resources in the candidate resource set is lower than threshold #2; threshold #2 is obtained by multiplying the number of resources in the resource pool by a certain percentage; or,
  • the number of time units where the candidate resources in the candidate resource set are located is less than threshold #3, and the number of candidate resources in the candidate resource set is less than threshold #4; or,
  • the number of time units in which the candidate resources in the candidate resource set are located is greater than or equal to threshold #7, and the number of candidate resources in each time unit is greater than or equal to threshold #8" is not satisfied.
  • thresholds for example, threshold #1 to threshold #8, etc.
  • threshold #1 to threshold #8 can be fixed values, or the number of time units in the resource pool multiplied by a ratio, and this application does not make any specific limitations on this.
  • the first transmission of UE1 requires x resources, and the candidate resource set finally determined by UE1 based on the CPE length through sensing the reservation message includes y resources. If y is less than x, then the candidate resource set must not satisfy the first requirement.
  • UE1 can increase the probability of selecting the candidate resource set by increasing the length of the first CPE, thereby obtaining more candidate resources for the first transmission.
  • the first transmission of UE1 requires x resources, and the candidate resource set finally determined by UE1 based on the CPE length through sensing the reservation message includes y resources, y is less than the threshold z for the number of candidate resources reported to the MAC layer, here
  • the size relationship between x and y values is not limited. It should be understood that the quantity threshold z may be specified by the protocol.
  • UE1 can increase the probability of selecting the candidate resource set by increasing the length of the first CPE, thereby obtaining more candidate resources for the first transmission.
  • UE1 can increase the chance of channel access by increasing the length of the first CPE. Using the increased length of the first CPE can filter out more candidates for the first transmission from the candidate resource pool as much as possible. resource. However, during the actual transmission process, UE1 can use the resource corresponding to the longest CPE length in the time slot m for the first transmission, reducing the impact of inter-UE blocking on other UEs; alternatively, UE1 can also use the increased third Resources corresponding to a CPE length are transmitted first to ensure the transmission efficiency of UE1; or, for the scenario of pre-emption checking, UE1 can determine the candidate resource set based on the checking results. For specific implementation methods, please refer to the above For the sake of simplicity, the specific implementation of step S430 of method 400 will not be described again here.
  • the resources on the time slot m can be used as a candidate resource for UE1 to perform the first transmission and reported to the MAC layer.
  • UE1 can transmit according to the first CPE length in this time slot m, which can ensure the transmission efficiency of UE1, but will cause transmission congestion to UE2; alternatively, UE1 can also transmit according to the first CPE length in this time slot m. Transmitting with two CPE lengths can ensure the transmission efficiency of UE1 and UE2 at the same time and avoid causing transmission congestion.
  • the method further includes: the first terminal device determines a third CPE length according to the reservation message, the third CPE length corresponds to the third resource, and the third CPE length is smaller than the second CPE length.
  • the first terminal device can determine a set of candidate resources for performing the first transmission based on the comparison results of different CPE lengths. It should be understood that after the first terminal device determines the candidate resource set at the physical layer, it needs to report the candidate resource set to the MAC layer for the MAC layer to perform resource selection, that is, select some or all resources from the candidate resource set for the first transmission. .
  • the candidate resource set includes a first candidate resource subset and/or a second candidate resource subset, the second CPE length corresponding to the resources in the first candidate resource subset is equal to the first CPE length, and the second CPE length corresponding to the resources in the second candidate resource subset is less than the first CPE length.
  • the candidate resource pool includes time slots 1 to 3.
  • UE1 determines that the resources reserved by UE2 are time slot 1 and time slot 3, and the resources reserved by UE3 are time slot 1 and time slot 2.
  • the resources reserved by UE4 are time slot 2 and time slot 3.
  • the first candidate resource subset is Including resources on time slot 1; the CPE#3 length corresponding to the highest priority of UE3's transmission on time slot 2 is the largest, and CPE#3 is smaller than the first CPE length, then the second candidate resource subset includes time slot 2 resources; the highest priority of UE4's transmission on time slot 3 corresponds to the largest length of CPE#4 (for example, CPE#4 is greater than CPE#2), and CPE#4 is greater than the length of the first CPE, then UE1 can use time slot 3 Resources on are excluded from the candidate resource pool. Therefore, UE1 reports that the first candidate resource subset of the MAC layer includes resources on time slot 1, and/or UE1 finally reports that the second candidate resource subset of the MAC layer includes resources on time
  • the candidate resource set includes a third candidate resource subset, the second CPE length corresponding to the resources in the third candidate resource subset is equal to the first CPE length, and the resources in the third candidate resource subset It is a resource on the first time unit, and the time unit where the first time unit and the second resource are located do not overlap.
  • the candidate resource pool includes time slots 1 to 5.
  • UE1 determines that the resources reserved by UE2 are time slot 1 and time slot 3, and that the resources reserved by UE3 are time slot 1 and time slot 2.
  • the resources reserved by UE4 are time slot 2 and time slot 3.
  • the CPE#2 corresponding to the highest priority of UE2's transmission on time slot 1 has the largest length (for example, CPE#2 is larger than CPE#3), and CPE#2 is equal to the length of the first CPE, then the third candidate resource subset includes resources on timeslot 1; the length of CPE#3 corresponding to the highest priority of UE3's transmission on timeslot 2 is the largest, and CPE#3 is smaller than the length of the first CPE.
  • the third candidate resource subset does not include resources on slot 2; the length of CPE#4 corresponding to the highest priority of UE4's transmission on slot 3 is the largest (for example, CPE#4 is larger than CPE#2), then the length of CPE#4 is larger than CPE#2.
  • the three candidate resource subsets include resources on time slot 1, and resources on unreserved time slots (eg, time slot 4 and/or time slot 5).
  • the candidate resource set is determined by comparing the CPE lengths of different terminal devices. Resource selection is performed based on the CPE length to prevent the transmission of the first terminal device from being blocked by the transmission of other terminal devices (or to prevent the transmission of the first terminal device from blocking the transmission of other terminal devices), thereby improving the transmission efficiency of the terminal device. Avoid unnecessary waste of spectrum resources and ensure system transmission performance.
  • the terminal device will spontaneously perform resource perception and resource selection (or resource reservation) to determine the time and frequency resources occupied by SL transmission.
  • the UE can seize the channel by sending CPE.
  • the specific length of the seizure time may be related to the transmission priority (such as the value of CAPC or priority). It can be based on the standard or implemented by the UE. Different transmission priorities correspond to different CPE lengths. Generally, the higher the transmission priority, the longer the corresponding CPE length.
  • the CPE length is a time domain resource, and CPE transmission is performed on the corresponding CPE length.
  • the length of time for CPE transmission can be defined as the CPE length.
  • the CPE length refers to the time interval from the starting point of the CPE (which can also be called the starting position of the CPE) to the time before the terminal device starts SL transmission, or in other words, The time interval from the starting point of this CPE to the next AGC symbol.
  • the earlier the CPE starting point the longer the corresponding CPE length.
  • the starting point of CPE is related to the priority of transmission. Different transmission priorities correspond to different starting points of CPE. Usually, the higher the priority or the smaller the CAPC value, the earlier the starting point of CPE. In the embodiments of the present application, unless otherwise specified, there is no special distinction between the CPE starting point and the CPE length and can be used interchangeably.
  • the determination of the CPE starting point may be any of the following.
  • the embodiment of this application refers to the CPE starting point in method (1) as the first preset CPE starting point.
  • the CPE starting point uses the combination of methods (2) and (3) as a preset CPE starting point set.
  • the CPE starting point in this set is called the second preset CPE starting point. The relevant parts will not be repeated below.
  • Method (1) The CPE starting point is located within one symbol before the next AGC symbol.
  • the first CPE starting point is on the last symbol of the previous timeslot, and the current timeslot is used for SL transmission;
  • Method (2) When the sub-carrier space (SCS) is 15 kHz, the CPE starting point is located within one symbol before the next AGC symbol. For example, the first CPE starting point is on the last symbol of the previous timeslot. , the current time slot is used for SL transmission;
  • SCS sub-carrier space
  • Mode (3) When the SCS is 30kHz or 60kHz, the CPE starting point is located at most 2 symbols before the next AGC symbol. For example, the first CPE starting point is on the last one or two symbols of the previous slot.
  • the current time Slots are used for SL transmission.
  • the first CPE starting point is on the last one or two symbols of the previous time slot, and can be on any of the last two symbols.
  • the CPE starting point is on the second to last symbol.
  • the CPE starting point is located on the last symbol; and, taking the last symbol as an example, the CPE starting point can be located at any position on the last symbol, such as 16us or 25us after the start of the symbol , this position is specified by the protocol or pre-configured by the UE factory.
  • the above-mentioned first preset CPE starting point is located within one symbol before the next AGC.
  • the first preset CPE starting point is preconfigured, and may be a default value, for example.
  • the preset CPE starting point set is located within one or two symbols before the next AGC and includes at least 2 preconfigured values.
  • the preset CPE starting point set is preconfigured, or is a value determined based on other factors such as priority (such as CAPC or priority), which is not limited in this application.
  • SL transmission does not limit the specific location of resource selection. That is to say, the UE occupying the full RB set may overlap with the frequency domain resources used by the UE occupying the partial RB set. In this case, if the UE occupying the partial RB set The CPE starting point of the UE is If the above method (1) is used, and the CPE starting point of the UE occupying the full RB set adopts the above method (3), the CPE lengths of the two will be unequal.
  • the UE occupying the full RB set Among the UEs occupying the partial RB set, the UE with an earlier CPE starting point will block the UE with a later CPE starting point, or in other words, the UE with a longer CPE length will block the UE with a shorter CPE length. Therefore, it may happen that a low-priority UE blocks a high-priority UE.
  • the CPE starting point of a high-priority (or higher-priority) UE (occupying the full RB set) is higher than that of a low-priority (or higher-priority) UE.
  • the CPE starting point of the UE of lower priority (occupying the partial RB set) is later; or the CPE starting point of the UE of higher priority (or higher priority) (occupying the partial RB set) is later than that of the UE of lower priority (occupying the partial RB set). or lower priority) UE (occupying the full RB set), the CPE starting point of the UE is later.
  • Figure 10 is a schematic diagram of resource selection by different terminal devices provided by an embodiment of the present application.
  • the resource reserved or selected by different terminal devices contains all or part of the resources of one or more RB sets in the frequency domain and contains one time slot in the time domain as an example for explanation.
  • resource #1 selected by UE-1 occupies all the resources in an RB set
  • resource #2 reserved by UE-x occupies part of the resources in the RB set. , that is, the frequency domain resources of resource #1 and resource #2 on the same time slot partially overlap.
  • the CPE starting point corresponding to resource #1 selected by UE-1 is determined using the above method (2), and the CPE reserved by UE-x
  • the CPE #2 starting point corresponding to resource #2 is determined using the above method (1).
  • the CPE starting points used by UE-1 and UE-x may be different. If the CPE starting point of UE-x is earlier than the CPE starting point of UE-1 starting point, and the transmission priority of UE-x is lower than the transmission priority of UE-1, then the transmission of UE-x will block the transmission of UE-1, causing the high-priority UE-1 LBT to fail and cannot transmit.
  • resource #1 selected by UE-1 occupies all resources in 4 RB sets, which are RB set #0, RB set #1, and RB set #. 2 and RB set #3, the resource #2 reserved by UE- 1
  • the CPE starting point corresponding to the selected resource #1 is determined using the above method (3)
  • the CPE #2 starting point corresponding to the resource #2 reserved by UE-x is determined using the above method (1), then UE-1 and UE- The CPE starting point adopted by x may be different.
  • the CPE starting point of UE-1 is later than that of UE-x, and the transmission priority of UE-1 is higher than the transmission priority of UE-x, then the The transmission will be blocked by the transmission of UE-x, that is, the transmission of low-priority UE-x blocks the transmission of high-priority UE-1, causing the transmission performance of UE-1 to degrade.
  • resource #1 selected by UE-1 occupies all resources in 4 RB sets, which are RB set #0 and RB set #1.
  • RB set #2 and RB set #3 resource #2 reserved by UE-x occupies all resources in an RB set (such as RB set #1), that is, resource #1 and resource #2 partially overlap.
  • UE-1 and UE-x can determine the CPE starting point-1 and CPE starting point-x corresponding to resource #1 and resource #2 respectively according to the transmission priority. Generally speaking, the higher the priority, the earlier the corresponding CPE starting point and the longer the CPE length.
  • UE-1 can transmit on resource #1; if the transmission priority of UE-1 is lower than the transmission priority of UE-x level, then UE-x can transmit on resource #2; if the transmission priority of UE-1 is equal to the transmission priority of UE-x, then the transmissions of both UE-1 and UE-x can proceed normally.
  • UE-1 in this scenario can also use the technical solution provided in the embodiment of this application to determine the CPE starting point-1. For specific implementation methods, please refer to the relevant description below.
  • the present application provides a communication method and device.
  • the first terminal equipment can use the reservation message sensed by the first terminal equipment to , determine the CPE starting point and transmission priority corresponding to different reservation resources, and combine it with the transmission priority of the first terminal device to determine the CPE starting point of the first terminal device and avoid collision of resources selected by different terminal devices as much as possible.
  • it ensures that high-priority transmission is not blocked by low-priority transmission, improves spectrum utilization, and ensures user service transmission and experience.
  • FIG 11 is a schematic flowchart of the communication method 1100 provided by the embodiment of the present application. As shown in Figure 11, the method includes the following steps.
  • the first terminal device receives the first reservation message.
  • the first reservation message indicates the second resource reserved by the second terminal device.
  • the first terminal device receives the first reservation message from the second terminal device, or the first terminal device receives the first reservation message from the network device, that is, the first reservation message is forwarded by the network device to the first terminal device, and the network
  • the device may receive the first reservation message from the second terminal device or other devices, that is, this application does not limit the manner in which the first terminal device obtains the first reservation message.
  • the first terminal device senses, monitors, or receives the first reservation message.
  • the first reservation message may explicitly or implicitly indicate the second resource reserved by the second terminal device.
  • the second resource includes but is not limited to: reservation interval information, frequency domain resource information, time domain resource information, and priority information.
  • reservation interval information for the specific meaning of each parameter, please refer to the relevant description of step S410 of the above method 400. For the sake of simplicity, No further details will be given here.
  • this application does not specifically limit the number of reservation messages that the first terminal device can sense, monitor, or receive, as well as the number of other terminal devices that send reservation messages to the first terminal device. That is, there can be one or more reservation messages.
  • the multiple reservation messages may be sent by the same terminal device to indicate multiple resources reserved by the terminal device; or the multiple reservation messages may also be sent by different terminal devices. Used to indicate the resources reserved by each terminal device.
  • the first terminal device can also receive a second reservation message from the second terminal device, or the first terminal device can also receive a second reservation message from a third terminal device. information.
  • the second resource is located in the first time slot of the multiple consecutive time slots; if the reservation message indicates that the second terminal device has reserved a time slot, then the time domain resource of the second resource is the time slot. It should be understood that this exemplary description also applies to the resources reserved by the reservation message in other embodiments.
  • the first terminal device determines the priority of the second transmission corresponding to the second CPE starting point and the second resource according to the first reservation message.
  • the second CPE starting point corresponds to the second resource.
  • the starting point of the second CPE is determined according to the priority of the second transmission. For example, it can be determined by the above method (2) or (3).
  • the second CPE The starting point may be within a symbol, such as a GP symbol, on the previous time unit (such as a time slot), or within the last one or two symbols on the previous time unit, and the current time unit is used for the second resource. Transmission; when the frequency domain resource of the second resource occupies a partial RB set, the second CPE starting point can be determined using the above method (1).
  • the second CPE starting point can be located within a symbol on the previous time unit, The current time unit is used for the transmission of the second resource.
  • the first terminal device determines the second CPE starting point based on the first reservation message.
  • the first terminal device determines the second CPE starting point based on the priority of the second transmission.
  • the first terminal device determines the second CPE starting point based on the priority of the second transmission.
  • the CPE starting point of the first reservation message determines the second CPE starting point.
  • the first terminal device determines the first CPE starting point or the third resource according to the priority of the second transmission, the second CPE starting point and the priority of the first transmission.
  • the first resource is a resource selected by the first terminal device for the first transmission, and the first resource and the second resource overlap at least part of the frequency domain resources (e.g., RB set) in the same time unit (e.g., time slot).
  • the first CPE starting point corresponds to the first resource, which means that the first CPE starting point can be within a symbol on the previous time unit (e.g., time slot), or within the last one or two on the previous time unit, and the current time unit is used for the transmission of the first resource.
  • the first resource may be a resource that occupies a full RB set or a resource that occupies a partial RB set. This application does not specifically limit this. Specifically, before the first terminal device performs step S1130, if the first resource occupies all frequency domain resources (full RB set) of one or more resource block sets on the first time unit (such as time slot #m), for example For the frequency domain resources occupied by UE-1 shown in (b) of Figure 10, the first terminal device can determine the corresponding CPE starting point according to the above method (2) or (3).
  • the CPE of UE-1 The starting point is the second preset CPE starting point; if the first resource occupies a partial frequency domain resource (partial RB set) of one or more resource block sets on the first time unit (such as time slot #m), such as Figure 10
  • the frequency domain resources occupied by UE-X shown in (a) and (c) of Figure 10 then the first terminal device can determine the corresponding CPE starting point according to the above method (1).
  • the UE-1 The CPE starting point is the first preset CPE starting point.
  • the application scenario of this implementation means that the first terminal device selects the first resource for the first transmission and senses, monitors, or receives reservation messages from other terminal devices (for example, the second terminal device's first reservation message), it is determined that some frequency domain resources overlap with the resources reserved by other terminal devices and the first resource selected by the first terminal device in the same time unit (for example, a certain time slot).
  • the first terminal device selects the full RB set resource (i.e., the first resource), and the second terminal device reserves the partial RB set resource (i.e., the second resource), the first terminal device is configured according to the priority of the second transmission.
  • the first terminal device is configured according to the priority of the second transmission.
  • the first resource occupies all frequency domain resources of one or more resource block sets on the first time unit (for example, time slot #m)
  • the second resource occupies part of the frequency domain resources of one or more resource block sets on the first time unit.
  • the second CPE starting point is the first preset CPE starting point determined using the above method (1).
  • the first terminal device determines that the first CPE starting point is no later than the second CPE starting point.
  • the first CPE starting point can be equal to the second CPE starting point, or it can be earlier than the second CPE starting point, so as not to cause the high-priority first transmission to be blocked by the low-priority second transmission.
  • the CPE starting point determined by the first terminal device for the first transmission (for ease of description, hereinafter referred to as CPE starting point #1, and will not be repeated below) is earlier than or equal to the second CPE If the starting point is the first terminal device, the first terminal device does not need to make adjustments. At this time, the CPE starting point #1 is the first CPE starting point, and the first terminal device can perform the first transmission normally. If the CPE starting point #1 is later than the second CPE starting point, the first transmission may be blocked by the second transmission, so the first terminal device can adjust the CPE starting point #1 to the same position as the second CPE starting point.
  • the CPE starting point #1 can be adjusted to be before the second CPE starting point to obtain the first CPE starting point, so that the first transmission can proceed normally. That is to say, the first CPE starting point determined by the first terminal device is the earlier one of CPE starting point #1 and the second CPE starting point. That is, this implementation can ensure that the high-priority first transmission is not blocked by the low-priority second transmission.
  • FIG 12 is a schematic diagram of resource selection provided by an embodiment of the present application.
  • resources reserved or selected by different terminal devices include an RB set in the frequency domain (for example, an RB set includes 4 sub-channels, such as sub-channel 0, sub-channel 1, sub-channel 2 and sub-channel 3
  • all or part of the resources include one time slot in the time domain for explanation.
  • resource #1 selected by UE1 for the first transmission is located in a full RB set on time slot m, that is, resource #1 occupies subchannel 0, subchannel 1, subchannel 2 and subchannel 3 on time slot m. For example, if the RB set on this time slot m is 20MHz, then each sub-channel is 5MHz.
  • UE1 needs to perform a reservation and re-evaluation check at time m-T3.
  • time slot n is the sensing window, and after time slot n is the resource selection window.
  • time slot n By sensing, monitoring, or receiving reservation messages from other UEs (such as UE2 and UE3), UE1 determines that UE2 and UE3 have simultaneously reserved resources in time slot m within the resource selection window, and that the resources reserved by UE2 and UE3 are in this time slot.
  • the frequency domain resources on m correspond to subchannel 0 and subchannel 2 respectively.
  • the resources reserved by UE3 appear every three time slots.
  • the frequency domain resources of UE1, UE2, and UE3 on time slot m partially overlap.
  • the resources reserved by UE2 and UE3 in the resource selection window are respectively called resource #2 and resource #3
  • the corresponding CPE starting points are CPE starting point #2 and CPE starting point #3 respectively.
  • CPE starting point #2 and CPE starting point #3 may be predefined.
  • the above-mentioned first preset CPE starting point is located in the last symbol of the m-1 time slot respectively.
  • the transmission priority of UE2 in this time slot m is higher than the transmission priority of UE3. If the transmission priority of UE1 is higher than the transmission priority of UE2 and UE3, then UE1 is The CPE start point #1 of resource #1 selected for the first transmission cannot be later than the earliest one of CPE start point #2 and CPE start point #3. For example, if UE1 determines that CPE starting point #2 is the earliest and CPE starting point #1 is earlier than or equal to CPE starting point #2, then UE1 may not adjust CPE starting point #1.
  • CPE start point #1 is later than the start point of CPE start point #2, UE1 can adjust CPE start point #1 to the same position as CPE start point #2, or adjust CPE start point #1 to the CPE start point The position before #2, so that UE1's transmission can proceed normally.
  • the first terminal device determines that the first CPE starting point is equal to the second CPE starting point. It should be understood that since the priority of the first transmission is equal to the priority of the second transmission, and the second CPE starting point may be predefined, such as the above-mentioned first preset CPE starting point, then the first CPE starting point is set equal to The second CPE starting point can prevent the first transmission and the second transmission of the same priority from blocking each other. That is to say, the first CPE starting point determined by the first terminal device may be the above-mentioned first preset CPE starting point.
  • the transmission of UE1 will be blocked by the transmission of UE2, then UE1 can adjust the CPE starting point #1 to The position of CPE starting point #2 can ensure the normal transmission of UE1 and UE2; or UE1 can also adjust the CPE starting point #1 to before CPE starting point #2 to obtain the first CPE starting point, which can ensure the normal transmission of UE1 The transfer proceeds normally. If the CPE starting point #2 corresponding to the second resource is later than the CPE starting point #1 corresponding to the first resource, UE1 does not need to make any adjustment.
  • the CPE starting point #1 is the first CPE starting point, so that the transmission of UE1 proceeds normally. ; If the CPE starting point #2 corresponding to the second resource is equal to the CPE starting point #1 corresponding to the first resource, then UE1 does not need to make adjustments. At this time, the CPE starting point #1 is the first CPE starting point, so that UE1 and UE2 Transmissions proceed normally.
  • UE1 determines the first transmission selection
  • the CPE starting point #1 of the selected resource #1 is equal to the CPE starting point #2 and CPE starting point #3 to ensure that the transmissions of UE1, UE2 and UE3 do not block each other and improve spectrum utilization.
  • UE1 may not adjust CPE starting point #1 to prevent UE1 from 's transmission is blocked by UE2's transmission.
  • CPE start point #1 is later than the start point of CPE start point #2, UE1 can adjust CPE start point #1 to the same position as CPE start point #2 to ensure normal transmission of UE1 and UE2, or change the CPE start point #1 to the same position as CPE start point #2.
  • the starting point #1 is adjusted to the position before the CPE starting point #2, so that the transmission of UE1 can proceed normally.
  • the first terminal device determines that the first CPE starting point is not earlier than the second CPE starting point.
  • the first CPE starting point can be equal to the second CPE starting point, or it can be later than the second CPE starting point, so as to prevent high-priority transmission from being blocked by low-priority transmission.
  • the first terminal device does not need to make adjustments. At this time, the CPE starting point #1 is the first CPE starting point, thus ensuring the second transmission. Work properly. If the CPE starting point #1 is earlier than the second CPE starting point, the first terminal device can adjust the CPE starting point #1 to the same position as the second CPE starting point, or it can also adjust the CPE starting point #1 to the second CPE starting point. After the second CPE starting point, the first CPE starting point is obtained, which ensures that the second transmission proceeds normally. That is to say, the first CPE starting point determined by the first terminal device is the later one of CPE starting point #1 and the second CPE starting point. That is, this implementation can ensure that the high-priority second transmission is not blocked by the low-priority first transmission.
  • UE1 can adjust CPE starting point #1 to the same position as CPE starting point #3, or adjust CPE starting point #1 to CPE starting point #3 The subsequent position to ensure that UE3's transmission is not blocked.
  • the first terminal device determines the third resource, and part or all of the third resource is used for the first transmission.
  • the terminal device performs the first transmission.
  • the third resource does not include the second resource.
  • the A terminal device determines the third resource, which triggers reselection.
  • the second terminal device For example, if the reservation message of another terminal device (for example, the second terminal device) indicates that the second terminal device has reserved multiple consecutive time slots, the second resource is located in the first time slot of the multiple consecutive time slots, corresponding to , the third resource determined by the first terminal device does not include the first time slot of the multiple time slots; if the reservation message indicates that the second terminal device has reserved a time slot, the time domain resource of the second resource is In this time slot, correspondingly, the third resource determined by the first terminal device does not include this time slot.
  • the first terminal device may not perform the first transmission on the first resource.
  • both the first terminal device and the second terminal device can perform normal transmission.
  • the third resource reselected by the first terminal device can occupy the full RB set on other time units (such as time slot #p) for the first transmission of the first terminal device, that is, the third resource and the second resource They do not overlap in the frequency domain.
  • the implementation method of triggering resource reselection can refer to the above related description. For the sake of simplicity, it will not be described again here.
  • the third resource actually refers to the candidate resource used by the first terminal device to perform the first transmission.
  • the first terminal device needs to report the third resource to the MAC layer.
  • the MAC layer performs resource selection, that is, selects some or all resources from the third resources for the first terminal device to perform the first transmission.
  • the second resource is in the first time slot of the multiple consecutive time slots; if the reservation message reserves a time slot, the second resource is in the first time slot of the multiple consecutive time slots. on this time slot.
  • UE1 in this time slot m is less than the transmission priority of UE2 and less than the transmission priority of UE3, and UE1 determines the CPE starting point #1 of resource #1 selected for the first transmission Later than CPE starting point #2 and later than CPE starting point #3, UE1 gives up the resource selected for the first transmission, that is, UE1 determines not to perform the first transmission on this time slot m.
  • UE1 can choose to select resources in time slot m-2 for the first transmission to prevent UE1's transmission from being blocked by transmissions of other UEs.
  • UE1 can determine whether to perform resource reselection based on the transmission priority, that is, regardless of the location of the CPE starting point corresponding to the resources reserved or selected by each UE. For example, when it is determined that the transmission priority of UE1 in time slot m is smaller than the transmission priority of UE2, UE1 may determine to trigger resource reselection to avoid transmission in time slot m being blocked by other high-priority transmissions.
  • UE1 may determine whether to perform resource reselection based on the transmission priority and the CPE starting point. For example, when it is determined that the transmission priority of UE1 on the time slot m is lower than the transmission priority of UE2, and the position of the CPE starting point #1 of UE1 is later than the CPE starting point #2 of UE2, UE1 may determine to trigger resource reselection to avoid the transmission on the time slot m being blocked by other high-priority transmissions.
  • the first terminal device determines the first The CPE starting point is the first preset CPE starting point or the second preset CPE starting point.
  • the method further includes: the first terminal device receives a second reservation message, and the second reservation message Instruct the third terminal device to reserve the third resource, and the third resource coincides with at least part of the frequency domain resources of the first resource on the same time unit; the first terminal device determines the third CPE starting point and the third resource according to the second reservation message Corresponding to the priority of the third transmission, the third CPE starting point corresponds to the third resource. Further, the first terminal device determines the first CPE starting point based on the priority of the second transmission, the second CPE starting point, the priority of the third transmission, the third CPE starting point and the priority of the first transmission.
  • the third CPE starting point corresponds to the third resource. It can be understood that the frequency domain resource of the third resource occupies a partial RB set, and the third CPE starting point can be determined by the above method (1).
  • the third CPE The starting point may be located within the last symbol on the previous time unit, and the current time unit is used for the transmission of the third resource.
  • the first terminal device determines the third CPE starting point based on the second reservation message. The first terminal device may determine the third CPE starting point based on the priority of the third transmission. Alternatively, the first terminal device may determine the third CPE starting point based on the second reservation message. The CPE starting point of the reservation message determines the third CPE starting point.
  • the first CPE starting point determined by UE1 may also be the first preset CPE starting point. For example, if the third CPE starting point corresponding to the third resource is earlier than or equal to CPE starting point #1 and the second CPE starting point, UE1 may not make adjustments. At this time, CPE starting point #1 is the first CPE starting point. Starting point, this can ensure the normal progress of the third transmission.
  • CPE starting point #1 is earlier than the third CPE starting point, UE1 can adjust CPE starting point #1 to the position of the third CPE starting point, or adjust it to after the third CPE starting point to obtain the first CPE starting point, Ensure that UE3 transmission proceeds normally. If CPE starting point #1 is later than the second CPE starting point, UE1 can adjust CPE starting point #1 to the position of the second CPE starting point, or adjust it to before the second CPE starting point to obtain the first CPE starting point, Ensure the normal operation of the first transmission.
  • UE1 determines CPE starting point #2 is earlier than CPE starting point #3, and CPE starting point #1 is earlier than or equal to CPE starting point #2, then UE1 does not need to make adjustments, and the transmission of UE1 can proceed normally. If UE1 determines that CPE starting point #2 is later or not earlier than CPE starting point #3, and CPE starting point #1 is earlier than or not later than CPE starting point #2, then UE1 does not need to make adjustments. At this time, UE3’s transmission It can proceed normally.
  • UE1 determines that CPE starting point #2 is equal to CPE starting point #3, and CPE starting point #1 is different from CPE starting point #2 and CPE starting point #3, then UE1 can adjust CPE starting point #1 to be the same as CPE starting point #1 #2 has the same starting position as CPE starting point #3, so that the transmission of UE1 can proceed normally.
  • the first terminal device determines the first CPE starting point as the second preset CPE starting point.
  • the second preset CPE starting point coincides with the first preset CPE starting point, and the second preset CPE starting point is one of the set of preset CPE starting points.
  • the second preset CPE starting point is one of the set of preset CPE starting points, and is not limited to the case where the priority of the second transmission is higher than or equal to the priority of the first transmission.
  • the set CPE starting point and the preset CPE starting point set please refer to the relevant description above.
  • the second preset CPE starting point coincides with the first preset CPE starting point. Because Therefore, in the case where the first terminal device perceives the reservation of the second terminal device occupying the partial RB set, the first terminal device determines that the priority of the second transmission is higher than or equal to the first according to receiving the first reservation message.
  • the first terminal device may determine the first CPE starting point using the above method (2). That is to say, the positions of the first CPE starting point and the second CPE starting point are the same, and at this time, the transmission of the lower priority first terminal device can be performed normally.
  • CPE starting point #1 is the first CPE starting point, which can ensure that UE2's transmission proceeds normally.
  • UE1 does not need to make adjustments, which can ensure that UE2's transmission proceeds normally.
  • the various implementation methods provided above are all in the case where the first terminal device does not send a reservation message, the first terminal device determines the priority of the second transmission according to the priority of the second transmission, the second CPE starting point and the priority of the first transmission. , the first CPE starting point determined.
  • the failure to send the reservation message may mean that the first terminal device has not sent any reservation message to other terminal devices in advance for the upcoming first transmission, or that other terminal devices cannot sense, monitor, or receive the third transmission.
  • a reservation message sent by a terminal device therefore cannot obtain the first resources required by the first terminal device for the first transmission in time, including but not limited to: reservation interval information, frequency domain resource information, time domain resource information, priority level information, etc.
  • the first terminal device can, according to the full RB set resources occupied by itself, according to the above method (2) or the method (3) Determine the first CPE starting point.
  • the first terminal device can use the above method (2) or method (3) according to the full RB set resources occupied by itself. ) determines the first CPE starting point for the first transmission, and the first terminal device may not perform the steps of the above method 1100.
  • the second terminal device may perform the above processing by default, that is, the second terminal device may perform the above processing according to the first CPE
  • the starting point, the priority of the first transmission and the priority of the second transmission determine the starting point of the second CPE.
  • the specific implementation method of the second terminal device determining the starting point of the second CPE please refer to the following description of the first terminal device determining the starting point of the first CPE in case 2. For the sake of simplicity, no description is given here.
  • the first terminal device shall be configured according to the priority of the second transmission.
  • the specific implementation method of determining the second CPE starting point and the first transmission priority and the first CPE starting point will be described. For parts that are not explained in detail, please refer to the relevant description of the above situation 1. For the sake of brevity, the details will not be repeated here.
  • the first resource occupies part of the frequency domain resources of one or more resource block sets on the first time unit (for example, time slot #m), and the second resource occupies one or more resource block sets on the first time unit. All frequency domain resources.
  • the second CPE starting point may be the second preset CPE starting point determined using the above method (2) or (3). In this case, the second CPE starting point is determined based on the priority (such as priority or CAPC) of the second transmission, which is determined based on the first reservation message; or, the second CPE starting point is Determined based on the CPE starting point of the first reservation message.
  • the first terminal device can also use the above method. (2) or (3) to determine the first CPE starting point corresponding to the first transmission.
  • the first terminal device determines that the first CPE starting point is no later than the second CPE starting point.
  • the first CPE starting point can be equal to the second CPE starting point, or it can be earlier than the second CPE starting point, so as not to cause the high-priority first transmission to be blocked by the low-priority second transmission.
  • FIG 13 is a schematic diagram of resource selection provided by an embodiment of the present application.
  • resources reserved or selected by different terminal devices include an RB set in the frequency domain (for example, an RB set includes 4 sub-channels, such as sub-channel 0, sub-channel 1, sub-channel 2 and sub-channel 3
  • all or part of the resources include one time slot in the time domain for explanation.
  • resource #1 selected by UE1 for the first transmission is located in a partial RB set on time slot m, that is, resource #1 occupies subchannel 1 on time slot m. For example, if the RB set on this time slot m is 20MHz, then each sub-channel is 5MHz.
  • UE1 Before time slot n is the sensing window, and after time slot n is the resource selection window. Before time slot n, By sensing, monitoring, or receiving reservation messages from other UEs (such as UE2), UE1 determines that UE2 has simultaneously reserved all resources in time slot m within the resource selection window, that is, subchannel 0, subchannel 1, subchannel 2, and subchannel 3. In other words, the frequency domain resources of UE1 and UE2 on time slot m partially overlap.
  • the resource reserved by UE2 within the resource selection window is called resource #2, and the corresponding CPE starting point is called CPE starting point #2.
  • CPE starting point #2 can be predefined, for example, the second preset CPE starting point determined according to the above method (2) or (3), located in the last symbol on the m-1 time slot, or located in Within the last two symbols on m-1 slot.
  • the CPE starting point #1 determined by UE1 for the first transmission is earlier than or equal to CPE starting point #2, then UE1 may not make any adjustments. At this time, CPE starting point #1 is the first CPE starting point, and UE1 can perform the first transmission normally. If CPE starting point #1 is later than CPE starting point #2, the first transmission may be blocked by the second transmission. Therefore, UE1 may adjust CPE starting point #1 to the same position as CPE starting point #2, or may adjust CPE starting point #1 to before CPE starting point #2 to obtain the first CPE starting point, so that the first transmission can proceed normally.
  • the first CPE starting point determined by the first terminal device is the earlier of CPE starting point #1 and the second CPE starting point to ensure that UE1's transmission is not blocked. That is, this implementation method can ensure that the high-priority first transmission is not blocked by the low-priority second transmission.
  • the first terminal device determines that the first CPE starting point is equal to the second CPE starting point.
  • the second CPE starting point can be predefined, such as the above-mentioned second preset CPE starting point
  • the first CPE starting point can be set at The location of the second CPE starting point can prevent the first transmission and the second transmission of the same priority from blocking each other. That is to say, the first CPE starting point determined by the first terminal device may be the above-mentioned second preset CPE starting point.
  • the first terminal device determines the first CPE starting point according to the above method (2) or (3), that is, the first CPE starting point The starting point is equal to the second preset CPE starting point. Since the second terminal device selects the full RB set resource (i.e. the second resource), the second CPE starting point corresponding to the second resource is the one in the above preset CPE starting point set. The second preset CPE starting point. At this time, the first CPE starting point and the second CPE starting point are the same. They are both the second preset CPE starting point determined according to the above method (2) or (3). This method makes the same Priority transmission selects the same CPE starting point to ensure that different transmissions can proceed normally without blocking each other or being blocked.
  • the first terminal device determines that the first CPE starting point is not earlier than the second CPE starting point.
  • the first CPE starting point can be equal to the second CPE starting point, or it can be later than the second CPE starting point, so as not to cause the high-priority second transmission to be blocked by the low-priority first transmission.
  • CPE starting point #1 is the first CPE starting point, which can ensure that UE2's transmission proceeds normally. That is to say, the first CPE starting point determined by UE1 is the later one of CPE starting point #1 and CPE starting point #2. That is, this implementation can ensure that the high-priority second transmission is not blocked by the low-priority first transmission.
  • the first terminal device determines third resources, and part or all of the third resources are used by the first terminal device to perform the first transmission. Among them, the third resource does not include the second resource.
  • the first terminal device may not be in the first terminal device.
  • the first transmission is performed on the resource, and by triggering resource reselection, both the first terminal device and the second terminal device can perform normal transmission.
  • the third resource reselected by the first terminal device can occupy the partial RB set on other time units (such as time slot #p) for the first transmission of the first terminal device, that is, the third resource and the second resource There is no overlap in the frequency domain to avoid transmission congestion.
  • the implementation methods of triggering resource reselection and reporting the third resource to the MAC layer may refer to the above related descriptions. For the sake of simplicity, they will not be described again here.
  • UE1 can re-select resource #3 for the first transmission in the resource selection window, such as time slot A partial RB set on m-2, that is, subchannel 0, so that the transmission of UE1 and UE2 can proceed normally.
  • the first terminal device determines the first The CPE starting point is the first preset CPE starting point or the second preset CPE starting point.
  • the method further includes: the first terminal device receives a second reservation message, and the second reservation The message indicates the third resource reserved by the third terminal device, and the third resource coincides with at least part of the frequency domain resources of the first resource on the same time unit; the first terminal device determines the third CPE starting point and the third resource according to the second reservation message.
  • the priority of the third transmission corresponding to the resource, and the starting point of the third CPE corresponds to the third resource.
  • the first terminal device determines the first CPE starting point based on the priority of the second transmission, the second CPE starting point, the priority of the third transmission, the third CPE starting point and the priority of the first transmission.
  • the first CPE starting point determined by UE1 can also be It is the second preset CPE starting point. Assume that the transmission priority of UE1 in this time slot m is higher than that of UE2 and lower than that of UE3. UE1 determines that CPE starting point #3 is earlier than CPE starting point #2, and CPE starting point #1 is later. is equal to or equal to CPE starting point #2, then UE1 does not need to make adjustments, so that high-priority UE3 can transmit normally.
  • UE1 determines that CPE starting point #2 is earlier than CPE starting point #3, and CPE starting point #1 is later than CPE starting point #2, then UE1 can adjust CPE starting point #1 to the same position as CPE starting point #2 , or adjust CPE starting point #1 to the position before CPE starting point #2, so that UE1's transmission can proceed normally.
  • the various implementation methods provided above are all in the case where the first terminal device does not send a reservation message, and the first terminal device determines the priority of the second transmission according to the priority of the second transmission, the second CPE starting point and the priority of the first transmission. Determine the first CPE starting point.
  • the first terminal device can determine the third terminal device according to the partial RB set resources occupied by itself according to the above method (1).
  • a CPE starting point if in the above step S1110, the first terminal device does not perceive the reservation message of the second terminal device, the first terminal device can determine the third terminal device according to the partial RB set resources occupied by itself according to the above method (1). A CPE starting point.
  • the first terminal device may determine the first CPE starting point for the first transmission according to the partial RB set resources occupied by itself according to the above method (1), and the first terminal device may not perform the steps of the above method 1100.
  • the above processing may be performed by the second terminal device by default, that is, the second terminal device determines the second CPE starting point according to the first CPE starting point, the priority of the first transmission and the priority of the second transmission.
  • the specific implementation method of the second terminal device determining the second CPE starting point can refer to the relevant description of the first terminal device determining the first CPE starting point in the above situation 1, and for the sake of brevity, it is not repeated here.
  • the first terminal device can determine the first CPE starting point as the first 2. Preset the CPE starting point, as long as the transmission of UE1 and other UEs is not blocked. For example, in the case where the second CPE starting point is earlier than the first preset CPE starting point, the first terminal device may determine the first CPE starting point to be the second preset CPE starting point.
  • CPE starting point #1 is the first preset CPE starting point in the above method (1)
  • the second preset CPE starting point can be determined as the first CPE starting point according to the above method (2) or (3).
  • the first CPE starting point is the second preset CPE starting point, so that UE1's transmission can proceed normally.
  • a terminal device may not consider the priority of the first transmission and/or the priority of the second transmission when determining the first CPE starting point.
  • the communication method embodiment of the present application is described in detail above with reference to FIGS. 1 to 13 .
  • the communication device side embodiment of the present application will be described in detail with reference to FIGS. 14 and 15 . It should be understood that the description of the device embodiments corresponds to the description of the method embodiments. Therefore, the parts not described in detail can be referred to the previous method embodiments.
  • FIG 14 is a schematic block diagram of a communication device 1000 provided by an embodiment of the present application.
  • the device 1000 may include a transceiver unit 1010 and a processing unit 1020.
  • the transceiver unit 1010 can communicate with the outside, and the processing unit 1020 is used for data processing.
  • the transceiver unit 1010 can also be called a communication interface or a transceiver unit.
  • the apparatus 1000 can implement steps or processes corresponding to those executed by the first terminal device (for example, UE1) in the above method embodiment, wherein the processing unit 1020 is used to execute the above method embodiment.
  • the transceiving unit 1010 is configured to perform operations related to processing of the first terminal device in the above method embodiment.
  • the device 1000 here is embodied in the form of a functional unit.
  • the term "unit” as used herein may refer to an application specific integrated circuit (ASIC), an electronic circuit, a processor (such as a shared processor, a proprietary processor, or a group of processors) used to execute one or more software or firmware programs. processor, etc.) and memory, merged logic circuitry, and/or other suitable components to support the described functionality.
  • ASIC application specific integrated circuit
  • processor such as a shared processor, a proprietary processor, or a group of processors
  • memory merged logic circuitry, and/or other suitable components to support the described functionality.
  • the device 1000 can be specifically the sending end in the above embodiment, and can be used to perform various processes and/or steps corresponding to the sending end in the above method embodiment, or, The device 1000 may be specifically a receiving end in the above embodiments, and may be used to perform various processes and/or steps corresponding to the receiving end in the above method embodiments. To avoid duplication, they will not be described again here.
  • the device 1000 of each of the above solutions has the function of realizing the corresponding steps performed by the sending end in the above method, or the device 1000 of each of the above solutions has the function of realizing the corresponding steps of the receiving end of the above method.
  • the functions described can be implemented by hardware, or can be implemented by hardware executing corresponding software.
  • the hardware or software includes one or more modules corresponding to the above functions; for example, the transceiver unit can be replaced by a transceiver (for example, the sending unit in the transceiver unit can be replaced by a transmitter, and the receiving unit in the transceiver unit can be replaced by a receiving unit. (machine replacement), other units, such as processing units, etc., can be replaced by processors to respectively perform the sending and receiving operations and related processing operations in each method embodiment.
  • the above-mentioned transceiver unit may also be a transceiver circuit (for example, it may include a receiving circuit and a transmitting circuit), and the processing unit may be a processing circuit.
  • the device in Figure 14 can be the receiving end or transmitting end in the aforementioned embodiment, or it can be a chip or a chip system, such as a system on chip (SoC).
  • SoC system on chip
  • the transceiver unit may be an input-output circuit or a communication interface.
  • the processing unit is a processor or microprocessor or integrated circuit integrated on the chip. No limitation is made here.
  • Figure 15 shows a schematic block diagram of a communication device 2000 provided by an embodiment of the present application.
  • the device 2000 includes a processor 2010 and a transceiver 2020.
  • the processor 2010 and the transceiver 2020 communicate with each other through an internal connection path, and the processor 2010 is used to execute instructions to control the transceiver 2020 to send signals and/or receive signals.
  • the device 2000 may also include a memory 2030, which communicates with the processor 2010 and the transceiver 2020 through internal connection paths.
  • the memory 2030 is used to store instructions, and the processor 2010 can execute the instructions stored in the memory 2030.
  • the apparatus 2000 is configured to implement various processes and steps corresponding to the first terminal device (for example, UE1) in the above method embodiment.
  • the first terminal device for example, UE1
  • the device 2000 can be specifically the transmitting end or receiving end in the above embodiment, or can be a chip or a chip system.
  • the transceiver 2020 can be a transceiver circuit of the chip, which is not limited here.
  • the device 2000 can be used to execute each step and/or process corresponding to the transmitting end or receiving end in the above method embodiment.
  • the memory 2030 may include read-only memory and random access memory and provide instructions and data to the processor.
  • a portion of the memory may also include non-volatile random access memory.
  • the memory may also store device type information.
  • the processor 2010 can be used to execute instructions stored in the memory, and when the processor 2010 executes the instructions stored in the memory, the processor 2010 is used to execute various steps of the above method embodiment corresponding to the sending end or the receiving end. and/or process.
  • each step of the above method can be completed by an integrated logic circuit of hardware in a processor or by instructions in the form of software.
  • the steps of the method disclosed in the embodiments of the present application can be directly embodied as being executed by a hardware processor, or by a combination of hardware and software modules in a processor.
  • the software module can be located in a random access memory, a flash memory, a read-only memory, a programmable read-only memory, or a programmable read-only memory.
  • the processor reads the information in the memory and completes the steps of the above method in combination with its hardware. To avoid repetition, it will not be described in detail here.
  • the processor in the embodiment of the present application may be an integrated circuit chip with signal processing capabilities. During the implementation process, each step of the above method embodiment can be completed through an integrated logic circuit of hardware in the processor or instructions in the form of software.
  • the above-mentioned processor may be a general-purpose processor, a digital signal processor, an application-specific integrated circuit, a field programmable gate array or other programmable logic device, a discrete gate or transistor logic device, or a discrete hardware component.
  • the processor in the embodiment of the present application can implement or execute the various methods, steps and logical block diagrams disclosed in the embodiment of the present application.
  • a general-purpose processor may be a microprocessor or the processor may be any conventional processor, etc.
  • the steps of the method disclosed in conjunction with the embodiments of the present application can be directly implemented by a hardware decoding processor, or executed by a combination of hardware and software modules in the decoding processor.
  • the software module can be located in random access memory, flash memory, read-only memory, programmable read-only memory or electrically erasable programmable memory, registers and other mature storage media in this field.
  • the storage medium is located in the memory, and the processor reads the information in the memory and completes the steps of the above method in combination with its hardware.
  • the memory in the embodiments of the present application can be a volatile memory or a non-volatile memory, or can include both volatile and non-volatile memories.
  • the non-volatile memory can be a read-only memory (ROM), a programmable read-only memory (PROM), an erasable programmable read-only memory (EPROM), an electrically erasable programmable read-only memory (EEPROM), or a flash memory.
  • the volatile memory can be a random access memory (RAM), which is used as an external cache.
  • RAM random access memory
  • SRAM static RAM
  • DRAM dynamic RAM
  • SDRAM synchronous DRAM
  • DDR SDRAM double data rate SDRAM
  • ESDRAM enhanced SDRAM
  • SLDRAM synchlink DRAM
  • DR RAM direct rambus RAM
  • FIG 16 is a schematic block diagram of a chip system 3000 provided by an embodiment of the present application.
  • the chip system 3000 (or can also be called a processing system) includes a logic circuit 3010 and an input/output interface (input/output interface) 3020.
  • the logic circuit 3010 may be a processing circuit in the chip system 3000.
  • the logic circuit 3010 can be coupled to the memory unit and call instructions in the memory unit, so that the chip system 3000 can implement the methods and functions of various embodiments of the present application.
  • the input/output interface 3020 can be an input/output circuit in the chip system 3000, which outputs information processed by the chip system 3000, or inputs data or signaling information to be processed into the chip system 3000 for processing.
  • the chip system 3000 is used to implement the operations performed by the terminal device in each of the above method embodiments.
  • the logic circuit 3010 is used to implement the processing-related operations performed by the first terminal device in the above method embodiment, such as the processing-related operations performed by the first terminal device in the embodiment shown in Figure 4, or as shown in Figure 6 Processing-related operations performed by the first terminal device in the embodiment, or processing-related operations performed by the first terminal device in the embodiment shown in FIG. 11; the input/output interface 3020 is used to implement the processing-related operations performed by the first terminal device in the above method embodiment.
  • the sending and/or receiving related operations performed by the terminal device are the sending and/or receiving related operations performed by the first terminal device in the embodiment shown in Figure 4, or the sending and/or receiving related operations performed by the first terminal device in the embodiment shown in Figure 6
  • the logic circuit 3010 is used to implement the processing-related operations performed by the second terminal device in the above method embodiment, such as the processing-related operations performed by the second terminal device in the embodiment shown in Figure 4, or the processing-related operations shown in Figure 6.
  • the sending and/or receiving related operations performed by the second terminal device such as the sending and/or receiving related operations performed by the second terminal device in the embodiment shown in Figure 4, or the second terminal device in the embodiment shown in Figure 6
  • An embodiment of the present application also provides a computer-readable storage medium on which computer instructions for implementing the methods executed by a terminal device (such as a first terminal device or a second terminal device) in the above-mentioned method embodiments are stored.
  • a terminal device such as a first terminal device or a second terminal device
  • Embodiments of the present application also provide a computer program product that includes instructions that, when executed by a computer, implement the methods executed by a terminal device (such as a first terminal device or a second terminal device) in each of the above method embodiments.
  • a terminal device such as a first terminal device or a second terminal device
  • An embodiment of the present application also provides a communication system, which includes the first terminal device and the second terminal device in the above embodiments.
  • the disclosed systems, devices and methods can be implemented in other ways.
  • the device embodiments described above are only illustrative.
  • the division of the units is only a logical function division. In actual implementation, there may be other division methods.
  • multiple units or components may be combined or can be integrated into another system, or some features can be ignored, or not implemented.
  • the coupling or direct coupling or communication connection between each other shown or discussed may be through some interfaces, and the indirect coupling or communication connection of the devices or units may be in electrical, mechanical or other forms.
  • the units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place, or they may be distributed to multiple network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of this embodiment.
  • each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.
  • the functions are implemented in the form of software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium.
  • the technical solution of the present application is essentially or the part that contributes to the existing technology or the part of the technical solution can be embodied in the form of a software product.
  • the computer software product is stored in a storage medium, including Several instructions are used to cause a computer device (which may be a personal computer, a server, or a device, etc.) to execute all or part of the steps of the methods described in various embodiments of this application.
  • the aforementioned storage media include: U disk, mobile hard disk, read-only memory, random access memory, magnetic disk or optical disk and other various media that can store program codes.

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Abstract

本申请实施例提供了一种通信方法和装置。该方法包括：第一终端设备接收预约消息，用于指示第二终端设备预约的第二资源；第一终端设备根据预约消息确定第二循环前缀拓展CPE长度，第二CPE长度与第二资源对应；第一终端设备根据第一CPE长度和第二CPE长度，确定第三资源或者调整第一CPE长度，第一CPE长度与第一资源对应，第一资源是第一终端设备已经为第一传输选择的资源，第一资源与第二资源的至少部分时域资源重合，第三资源的部分或全部资源用于第一终端设备进行第一传输。通过在对资源进行预留空和重评估过程中引入CPE长度，重新确定用于第一传输的资源，提高频谱资源的利用率，以及保障网络传输性能。

Description

通信方法和装置
本申请要求于2022年09月20日提交国家知识产权局、申请号为202211140512.9、发明名称为“一种资源选择方法及通信设备”的中国专利申请的优先权，以及要求于2022年09月30日提交国家知识产权局、申请号为202211213107.5、发明名称为“通信方法和装置”的中国专利申请的优先权，以及要求于2023年04月07日提交国家知识产权局、申请号为202310401598.4、发明名称为“通信方法和装置”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
本申请涉及通信领域，并且更具体地，涉及一种通信方法和装置。
背景技术
在无线通信系统中，频谱资源可以分为授权频谱和非授权频谱。在侧行链路(sidelink，SL)传输过程中，使能非授权频谱是一个重要演进方向。在非授权频谱中，终端设备需要在资源池中选择用于传输数据的物理资源。例如，终端设备可以通过先听后说(listen before talk，LBT)抢占信道，或者分享其他终端设备抢占信道后得到的资源传输数据。
由于非授权频谱使用成本低，接入自由度大，只要满足一定的接入规则，任何技术都可以使用。因此，可能会出现不同的终端设备预约同一资源的情况，即不同终端设备选择的资源发生碰撞，导致传输阻断。
因此，如何保证频谱资源的利用率，提升系统传输性能是亟待解决的问题。
发明内容
本申请提供一种通信方法和装置，通过在资源选择时考虑循环前缀拓展(cyclic prefix extension，CPE)的影响，避免不同终端设备之间发生资源碰撞，进而提高频谱利用率和系统传输性能。
第一方面，提供了一种通信方法，该方法可以由第一终端设备(例如，用户设备(user equipment，UE1))执行，或者，也可以由用于第一终端设备的芯片或电路执行，本申请对此不作限定。为了便于描述，下面以由第一终端设备执行为例进行说明。
该方法包括：第一终端设备接收预约消息，预约消息指示第二终端设备预约的第二资源；第一终端设备根据预约消息确定第二循环前缀拓展CPE长度，第二CPE长度与第二资源对应；第一终端设备根据第一CPE长度和第二CPE长度，确定第三资源或者调整第一CPE长度；其中，第一CPE长度是根据第一终端设备的第一传输的优先级确定的，且第一CPE长度与第一资源对应，第一资源是第一终端设备已经为第一传输选择的资源，第一资源与第二资源的至少部分时域资源重合，第三资源的部分或全部资源用于第一终端设备进行第一传输。
根据本申请提供的方案，第一终端设备在感知到其他终端设备预约的资源与第一终端设备已经选择的资源在时间单元上有重合的时候，通过比较CPE长度来决定是否继续占用该时间单元，尽可能地避免第一终端设备的传输被其他终端设备的传输阻塞(或者，避免第一终端设备的传输阻塞其他终端设备的传输)，提高传输效率，避免频谱资源的不必要浪费。即通过在对资源进行预留空和重评估过程中引入CPE长度，重新确定用于第一传输的资源，提高频谱资源的利用率，以及保障传输性能。
结合第一方面，在第一方面的某些实现方式中，第一终端设备根据第一CPE长度和第二CPE长度，确定第三资源或者调整第一CPE长度，包括：在第一CPE长度小于第二CPE长度的情况下，第一终端设备确定第三资源。
基于上述方案，针对其他UE预约的资源的时域资源与第一资源的时域资源重合(例如，时隙m)的情况，通过比较第一CPE长度和其他CPE长度，只要其他UE的传输对应的CPE长度大于第一CPE长度，第一终端设备进行资源重选，避免第一终端设备的第一传输被其他UE的传输阻塞，保证用户体 验。应理解，该实现方式对该时域资源上的频域资源是否重合不作限定。
结合第一方面，在第一方面的某些实现方式中，在第一CPE长度小于第二CPE长度的情况下，第一终端设备确定第三资源，包括：在第一CPE长度小于第二CPE长度，且第一资源与第二资源的至少部分频域资源重合的情况下，第一终端设备确定第三资源。
基于上述方案，针对其他UE预约的资源的时域资源与第一资源的时域资源重合(例如，时隙m)，且该时域资源上的频域资源有重合的情况，通过比较第一CPE长度和其他CPE长度，只要其他UE的传输对应的CPE长度大于第一CPE长度，第一终端设备进行资源重选，避免第一终端设备的第一传输被其他UE的传输阻塞，同时避免频域资源的不必要的浪费，提高频谱利用率和系统传输性能。
结合第一方面，在第一方面的某些实现方式中，第一终端设备根据第一CPE长度和第二CPE长度，确定第三资源或者调整第一CPE长度，包括：在第一CPE长度等于第二CPE长度，第一资源与第二资源的至少部分频域资源重合，且预约消息的参考信号的接收功率(reference signal received power，RSRP)高于第一阈值的情况下，第一终端设备确定第三资源。
基于上述方案，针对其他UE预约的资源的时域资源与第一资源的时域资源重合(例如，时隙m)，频域资源至少部分重合，且预约消息的RSRP高于第一阈值的情况，通过比较第一CPE长度和其他CPE长度，即使其他UE的传输对应的CPE长度等于第一CPE长度，第一终端设备进行资源重选，避免第一终端设备的第一传输被其他UE的传输阻塞，同时避免频域资源的不必要的浪费，提高频谱利用率，降低传输时延。
结合第一方面，在第一方面的某些实现方式中，第一终端设备根据第一CPE长度和第二CPE长度，确定第三资源或者调整第一CPE长度，包括：第一终端设备根据第一CPE长度和第二CPE长度，调整第一终端设备在第一时间单元上的第一CPE长度为第三CPE长度，第一时间单元是第一资源和第二资源的重合部分的时域资源，第三CPE长度大于或等于第二CPE长度。
基于上述方案，针对不同终端设备(例如，UE1和UE2)预约的资源在时域上有重合的场景，通过比较不同终端设备预约的资源对应的CPE长度，特别是在CPE长度不相同的情况下，UE1可以选择调整自己的CPE长度，避免UE1的传输被UE2的传输阻塞，和/或避免UE2的传输被第UE1的传输阻塞，保证用户体验和传输性能。
结合第一方面，在第一方面的某些实现方式中，第一终端设备根据预约消息确定第四CPE长度，第四CPE长度与第四资源对应，第四CPE长度大于第二CPE长度；其中，第一终端设备根据第一CPE长度和第二CPE长度，确定第三资源或者调整第一CPE长度，包括：第一终端设备根据第一CPE长度、第四CPE长度和第二CPE长度，调整第一终端设备在第一时间单元上的第一CPE长度为第三CPE长度，第一时间单元是第一资源和第二资源的重合部分的时域资源，第三CPE长度大于或等于第四CPE长度。
基于上述方案，针对多个其他终端设备(例如，UE2和UE4)预约的资源在时域上有重合的场景，通过比较最高优先级的传输对应的CPE长度与UE1的第一CPE长度，特别是在CPE长度不相同的情况下，第一终端设备可以选择调整自己的CPE长度，避免第一终端设备的第一传输被其他UE的传输阻塞，和/或避免其他终端设备的传输被第一终端设备的传输阻塞，保证用户体验和传输性能，提高用户传输效率和频谱利用率。
结合第一方面，在第一方面的某些实现方式中，第一终端设备根据第一CPE长度和第二CPE长度，调整第一终端设备在第一时间单元上的第一CPE长度为第三CPE长度，包括：在第一CPE长度大于或小于第二CPE长度，第一资源与第二资源的至少部分频域资源重合，且预约消息的RSRP低于第一阈值的情况下，第一终端设备调整在第一时间单元上的第一CPE长度为第三CPE长度。
基于上述方案，在比较第一CPE长度和第二CPE长度的基础上，考虑预约消息的RSRP限制，能够有效避免UE1的传输阻塞其他UE的传输，或者避免其他UE的传输阻塞UE1的传输，保证系统传输性能和频谱使用率。
结合第一方面，在第一方面的某些实现方式中，第一终端设备根据第一CPE长度和第二CPE长度，调整第一终端设备在第一时间单元上的第一CPE长度为第三CPE长度，包括：在第一CPE长度大于或小于第二CPE长度，且第一资源与第二资源的频域资源不重合的情况下，第一终端设备调整在第一时间单元上的第一CPE长度为第三CPE长度。
基于上述方案，在比较第一CPE长度和第二CPE长度的基础上，考虑预约资源的频域资源是否重合，能够有效避免UE1的传输阻塞其他UE的传输，或者避免其他UE的传输阻塞UE1的传输，保证系统传输性能和频谱使用率。
结合第一方面，在第一方面的某些实现方式中，第二CPE长度是根据第二资源对应的传输的优先级确定的；或者，第二CPE长度是根据预约消息所占用的CPE长度确定的
基于上述方案，第一终端设备通过接收一个或多个预约消息，可以确定每个预约消息的传输所占用的CPE长度，以及每个预约消息的预约资源的传输的优先级，进而根据CPE长度和传输优先级确定第二CPE长度。
第二方面，提供了一种通信方法，该方法可以由第一终端设备(例如，UE1)执行，或者，也可以由用于第一终端设备的芯片或电路执行，本申请对此不作限定。为了便于描述，下面以由第一终端设备执行为例进行说明。
该方法包括：第一终端设备接收预约消息，预约消息指示第二终端设备预约的第二资源；第一终端设备根据预约消息确定第二循环前缀拓展CPE长度，第二CPE长度与第二资源对应；第一终端设备根据第一CPE长度和第二CPE长度，确定候选资源集合，候选资源集合的部分或全部资源用于第一终端设备进行第一传输，第一CPE长度是根据第一终端设备的第一传输的优先级确定的。
根据本申请提供的方案，通过比较不同终端设备的CPE长度，确定候选资源集合。基于CPE长度进行资源选择，有针对性地避免第一终端设备的传输被其他终端设备的传输阻塞(或者，避免第一终端设备的传输阻塞其他终端设备的传输)，提高终端设备的传输效率，避免频谱资源的不必要浪费，保障系统传输性能。
结合第二方面，在第二方面的某些实现方式中，第一终端设备根据第一CPE长度和第二CPE长度，确定候选资源集合，包括：在第一CPE长度小于第二CPE长度的情况下，第一终端设备排除第三资源，得到候选资源集合，第三资源为第二资源所在时间单元上的频域资源。
基于上述方案，UE1在感知到其他CPE长度大于第一CPE长度的情况下，则UE1可以将其他CPE长度对应的预约资源所在时间单元上的频域资源从待选资源池中排除，避免造成不同终端设备之间的传输的阻塞，能够减少频谱资源(尤其是第二资源所在时间单元上，第二资源不包括的频域资源)的不必要浪费，提升终端设备的传输效率，提升用户体验。
结合第二方面，在第二方面的某些实现方式中，第一终端设备根据第一CPE长度和第二CPE长度，确定候选资源集合，包括：在第一CPE长度大于或等于第二CPE长度的情况下，第一终端设备将第四资源作为候选资源集合；其中，第四资源包括：第一时间单元上的资源，第一时间单元与第二资源所在的时间单元不重叠，即未被其他UE预约的时间单元上的资源；和/或，第二资源所在时间单元上的部分或全部资源。
基于上述方案，UE1在感知到其他CPE长度小于第一CPE长度的情况下，则UE1可以将其他CPE长度对应的预约资源所在时间单元上的部分或全部资源作为候选资源，另外，可以按照较短的其他CPE长度进行传输，能够尽可能地避免对其他终端设备的传输的阻塞，减少频谱资源的不必要浪费，提升终端设备的传输效率。
结合第二方面，在第二方面的某些实现方式中，第一终端设备还可以根据预约消息确定第三CPE长度，第三CPE长度与第三资源对应，第三CPE长度小于第二CPE长度，第三资源与第二资源位于同一时间单元。
可选地，该第二CPE长度可以是该时间单元上所有预约资源对应的CPE长度最长的。
基于上述方案，针对同一时间单元上的多个预约资源，只要CPE长度(例如，第二CPE长度和第三CPE长度)小于第一CPE长度，UE1可以将第二CPE长度和第三CPE长度对应的预约资源都作为候选资源。
结合第二方面，在第二方面的某些实现方式中，第一终端设备根据第一CPE长度和第二CPE长度，确定候选资源集合，包括：在第一CPE长度等于第二CPE长度，且预约消息的参考信号的接收功率RSRP高于第一阈值的情况下，第一终端设备排除与第二资源至少部分重合的资源，得到候选资源集合。
基于上述方案，UE1在感知到其他CPE长度等于第一CPE长度的情况下，进一步考虑预约消息的 RSRP限制，则UE1可以将其他CPE长度对应的预约资源所在时间单元上的部分或全部资源作为候选资源，选择与第一CPE长度相同的CPE长度对应的资源进行第一传输，不仅能够避免UE1的传输被其他终端设备的传输阻塞，同时能够避免UE1的传输阻塞其他终端设备的传输，提高终端设备的传输效率，避免频谱资源的不必要浪费，保障系统传输性能。
结合第二方面，在第二方面的某些实现方式中，候选资源集合包括第一候选资源子集，和/或第二候选资源子集，第一候选资源子集中的资源对应的第二CPE长度等于第一CPE长度，第二候选资源子集中的资源对应的第二CPE长度小于第一CPE长度。
基于上述方案，以第一CPE长度为基准，可以将与第一CPE长度相等的第一待选资源子集，以及比第一CPE长度短的第二待选资源集合单独或者联合作为候选资源集合的子集，上报至MAC层，供MAC层优先选择第一候选资源子集，和/或第二候选资源子集作为第一传输的资源。该实现方式不仅能够避免UE1的传输被其他终端设备的传输阻塞，同时能够避免UE1的传输阻塞其他终端设备的传输，提高终端设备的传输效率，避免频谱资源的不必要浪费，保障系统传输性能。
结合第二方面，在第二方面的某些实现方式中，候选资源集合包括第三候选资源子集，第三候选资源子集中的资源对应的第二CPE长度等于第一CPE长度，以及第三候选资源子集中的资源为第一时间单元上的资源，第一时间单元与第二资源所在的时间单元不重叠，即未被其他UE预约的时间单元上的资源。
基于上述方案，可以将无预约的时间单元上的资源，以及与第一CPE长度相等的待选资源作为候选资源集合中的一个单独的候选资源子集，上报至MAC层，供MAC层优先选择第三候选资源子集作为第一传输的资源，不仅能够避免UE1的传输被其他终端设备的传输阻塞，同时能够避免UE1的传输阻塞其他终端设备的传输，提高终端设备的传输效率，避免频谱资源的不必要浪费，保障系统传输性能。
结合第二方面，在第二方面的某些实现方式中，在候选资源集合无法满足第一终端设备的第一传输的需求的情况下，第一终端设备增加第一CPE长度；其中，第一终端设备根据第一CPE长度和第二CPE长度，确定候选资源集合，包括：第一终端设备根据增加后的第一CPE长度和第二CPE长度，确定候选资源集合。
结合第二方面，在第二方面的某些实现方式中，候选资源集合无法满足第一终端设备的第一传输的需求，包括以下一项或多项：候选资源集合中的候选资源所在的时间单元数量低于第二阈值；或者，候选资源集合中的候选资源数量低于第三阈值。
基于上述方案，针对候选资源集合无法满足UE1的第一传输的需求的场景，第一终端设备可以增加第一CPE长度，来获取更多的用于第一传输的候选资源，能够保证UE1的传输性能，避免频谱资源的不必要浪费。
结合第二方面，在第二方面的某些实现方式中，第二CPE长度是根据第二资源对应的传输的优先级确定的；或者，第二CPE长度是根据预约消息所占用的CPE长度确定的。
基于上述方案，第一终端设备通过接收一个或多个预约消息，可以确定每个预约消息的传输所占用的CPE长度，以及每个预约消息的预约资源的传输的优先级，进而根据CPE长度和传输优先级确定第二CPE长度。
第三方面，提供了一种通信装置，包括：收发单元，用于接收预约消息，预约消息指示第二终端设备预约的第二资源；处理单元，用于根据预约消息确定第二循环前缀拓展CPE长度，第二CPE长度与第二资源对应；处理单元，还用于根据第一CPE长度和第二CPE长度，确定第三资源或者调整第一CPE长度；其中，第一CPE长度是根据第一终端设备的第一传输的优先级确定的，且第一CPE长度与第一资源对应，第一资源是第一终端设备已经为第一传输选择的资源，第一资源与第二资源的至少部分时域资源重合，第三资源的部分或全部资源用于第一终端设备进行第一传输。
该收发单元可以执行前述第一方面中的接收和发送的处理，处理单元可以执行前述第一方面中除了接收和发送之外的其他处理。
第四方面，提供了一种通信装置，包括：收发单元，用于接收预约消息，预约消息指示第二终端设备预约的第二资源；处理单元，用于根据预约消息确定第二循环前缀拓展CPE长度，第二CPE长度与第二资源对应；处理单元，还用于根据第一CPE长度和第二CPE长度，确定候选资源集合，候选资源 集合的部分或全部资源用于第一终端设备进行第一传输，第一CPE长度是根据第一终端设备的第一传输的优先级确定的。
该收发单元可以执行前述第二方面中的接收和发送的处理，处理单元可以执行前述第二方面中除了接收和发送之外的其他处理。
第五方面，提供了一种通信方法，该方法可以由第一终端设备(例如，UE1)执行，或者，也可以由用于第一终端设备的芯片或电路执行，本申请对此不作限定。为了便于描述，下面以由第一终端设备执行为例进行说明。
该方法包括：第一终端设备接收第一预约消息，第一预约消息指示第二终端设备预约的第二资源；第一终端设备根据第一预约消息确定第二循环前缀拓展CPE起始点和第二资源对应的第二传输的优先级，第二CPE起始点与第二资源对应；第一终端设备根据第二传输的优先级、第二CPE起始点和第一传输的优先级，确定第一CPE起始点或第三资源，其中，第一CPE起始点与第一资源对应，第一资源是第一终端设备为第一传输选择的资源，第一资源与第二资源在同一时间单元上的至少部分频域资源重合，第三资源的部分或全部资源用于第一终端设备进行第一传输。
根据本申请提供的方案，第一终端设备在感知到其他终端设备预约的第二资源与第一终端设备选择的第一资源在同一时间单元上的部分频域资源有重合的情况下，通过比较第二CPE起始点、第二传输的优先级和第一传输的优先级来决定第一CPE起始点的位置，尽可能地避免第一终端设备的传输被其他终端设备的传输阻塞(或者，避免第一终端设备的传输阻塞其他终端设备的传输)，提高传输效率，避免频谱资源的不必要浪费。即通过在对资源进行预留空和重评估过程中引入第二CPE起始点和第二传输的优先级，重新确定用于第一传输的第一CPE起始点，提高频谱资源的利用率，以及保障传输性能。
结合第五方面，在第五方面的某些实现方式中，第一终端设备根据第二传输的优先级、第二CPE起始点和第一传输的优先级，确定第一CPE起始点或第三资源，包括：在第一传输的优先级高于或等于第二传输的优先级的情况下，第一终端设备确定第一CPE起始点不晚于第二CPE起始点。
基于上述方案，针对其他终端设备预约的资源与第一资源在同一时间单元(例如，时隙m)上的部分频域资源有重合的情况下，通过比较第一传输的优先级和第二传输的优先级，即当第一传输优先级高于或等于其他终端设备的传输优先级时，第一终端设备确定第一CPE起始点不晚于第二CPE起始点，或者说，第一CPE起始点早于或等于第二CPE起始点，或者说，第一CPE起始点是第二CPE起始点和CPE起始点#1(即，在确定第一CPE起始点之前，第一终端设备为第一传输确定的CPE起始点)中较早的一个。该方式能够避免第一终端设备的第一传输被其他终端设备的传输阻塞，保证第一终端设备的用户体验。也就是说，该方式能够保证高优先级的传输不被低优先级的传输阻塞。
结合第五方面，在第五方面的某些实现方式中，第一终端设备根据第二传输的优先级、第二CPE起始点和第一传输的优先级，确定第一CPE起始点或第三资源，包括：在第一传输的优先级等于第二传输的优先级的情况下，第一终端设备确定第一CPE起始点等于第二CPE起始点。
基于上述方案，针对其他终端设备预约的资源与第一资源在同一时间单元(例如，时隙m)上的部分频域资源有重合的情况下，通过比较第一传输的优先级和第二传输的优先级，即当第一传输优先级等于其他终端设备的传输优先级时，第一终端设备确定第一CPE起始点等于第二CPE起始点，或者说，第一CPE起始点和第二CPE起始点的位置相同。该方式能够避免第一终端设备的第一传输被其他终端设备的传输阻塞，保证第一终端设备的用户体验，或者说，该方式能够保证相同的传输优先级的不同终端设备互相不阻塞，即第一终端设备和第二终端设备可以同时进行传输，提高频谱利用率。
结合第五方面，在第五方面的某些实现方式中，第一终端设备根据第二传输的优先级、第二CPE起始点和第一传输的优先级，确定第一CPE起始点或第三资源，包括：在第一传输的优先级低于或等于第二传输的优先级的情况下，第一终端设备确定第一CPE起始点不早于第二CPE起始点。
基于上述方案，针对其他终端设备预约的资源与第一资源在同一时间单元(例如，时隙m)上的部分频域资源有重合的情况下，通过比较第一传输的优先级和第二传输的优先级，即当第一传输优先级低于或等于其他终端设备的传输优先级时，第一终端设备确定第一CPE起始点不早于第二CPE起始点，或者说，第一CPE起始点晚于或等于第二CPE起始点，或者说，第一CPE起始点是第二CPE起始点和CPE起始点#1(即，在确定第一CPE起始点之前，第一终端设备为第一传输确定的CPE起始 点)中较晚的一个。该方式能够避免第一终端设备的第一传输不阻塞其他终端设备的传输，保证第二终端设备的用户体验。也就是说，该方式能够保证高优先级的传输不被低优先级的传输阻塞。
结合第五方面，在第五方面的某些实现方式中，第一终端设备根据第二传输的优先级、第二CPE起始点和第一传输的优先级，确定第一CPE起始点或第三资源，包括：在第一传输的优先级低于或等于第二传输的优先级的情况下，第一终端设备确定第三资源，其中，第三资源不包括第二资源。
基于上述方案，针对其他终端设备预约的资源与第一资源在同一时间单元(例如，时隙m)上的部分频域资源有重合的情况下，通过比较第一传输的优先级和第二传输的优先级，即当第一传输优先级低于或等于其他终端设备的传输优先级时，第一终端设备进行资源重选，避免第一终端设备的第一传输被其他终端设备的传输阻塞，保证用户体验。
结合第五方面，在第五方面的某些实现方式中，第一终端设备接收第二预约消息，第二预约消息指示第三终端设备预约的第三资源，第三资源与第一资源在同一时间单元上的至少部分频域资源重合；第一终端设备根据第二预约消息确定第三CPE起始点和第三资源对应的第三传输的优先级，第三CPE起始点与第三资源对应。
其中，第一终端设备根据第二传输的优先级、第二CPE起始点和第一传输的优先级，确定第一CPE起始点或第三资源，包括：第一终端设备根据第二传输的优先级、第二CPE起始点、第三传输的优先级、第三CPE起始点和第一传输的优先级，确定第一CPE起始点，其中，在第一传输的优先级高于第二传输的优先级，且第一传输的优先级低于第三传输的优先级的情况下，第一终端设备确定第一CPE起始点为第一预设CPE起始点，或者第二预设CPE起始点，第二预设CPE起始点是预设CPE起始点集合中的一个。
基于上述方案，针对多个其他终端设备预约的多个资源与第一资源在同一时间单元(例如，时隙m)上的部分频域资源有重合的情况下，通过比较第二传输的优先级、第二CPE起始点、第三传输的优先级、第三CPE起始点和第一传输的优先级，即当第一传输的优先级高于第二传输的优先级，且第一传输的优先级低于第三传输的优先级的情况下，第一终端设备确定第一CPE起始点为第一预设CPE起始点或者第二预设CPE起始点，避免第一终端设备的第一传输被其他终端设备的传输阻塞，和/或避免其他终端设备的传输被第一终端设备的传输阻塞，保证用户体验和传输性能，提高用户传输效率和频谱利用率。
结合第五方面，在第五方面的某些实现方式中，第一预设CPE起始点和/或预设CPE起始点集合是预配置的。
示例性的，第一预设CPE起始点位于下一个AGC符号之前的一个符号内，预设CPE起始点集合包括第二预设CPE起始点，具体的，当子载波间隔(sub-carrier space，SCS)为15kHz时，第二预设CPE起始点位于下一个AGC符号之前的一个符号内；当SCS为30或60kHz时，第二预设CPE起始点位于下一个AGC符号之前的至多2个符号内。
结合第五方面，在第五方面的某些实现方式中，第一资源占用第一时间单元上的一个或多个资源块集合的全部频域资源，第二资源占用第一时间单元上的一个或多个资源块集合的部分频域资源；其中，第二CPE起始点是第一预设CPE起始点。
基于上述方案，第一终端设备占用第一时间单元上的一个或多个资源块集合的全部频域资源(full RB set)，第二终端设备占用第一时间单元上的一个或多个资源块集合的部分频域资源(partial RB set)，则可以认为第二终端设备的第二传输的第二CPE起始点为第一预设起始点，即可以是预设的default的值，第一终端设备的第一传输的CPE起始点#1则是根据优先级(例如CAPC或priority)确定的。
结合第五方面，在第五方面的某些实现方式中，第二预设CPE起始点和第一预设CPE起始点重合，第二预设CPE起始点是预设CPE起始点集合中的一个；其中，第一终端设备根据第二传输的优先级和第二CPE起始点，以及第一CPE起始点和第一传输的优先级，确定第一CPE起始点或第三资源，包括：在第二传输的优先级高于或等于第一传输的优先级的情况下，第一终端设备确定第一CPE起始点为第二预设CPE起始点。
基于上述方案，第一预设CPE起始点和第一预设CPE起始点重合的是指：该CPE起始点位于下一个AGC符号之前的一个符号内。针对其他终端设备预约的资源与第一资源在同一时间单元(例如，时隙m)上的部分频域资源有重合的情况下，通过比较第二传输的优先级、第二CPE起始点和第一传 输的优先级，即当第二传输的优先级高于或等于第一传输的优先级的情况下，第一终端设备确定第一CPE起始点为第二预设CPE起始点，或者说，此时第一CPE起始点与第一预设CPE起始点也相同。该方式能够避免第一终端设备的第一传输被其他终端设备的传输阻塞，保证用户体验和传输性能，提高用户传输效率和频谱利用率。
结合第五方面，在第五方面的某些实现方式中，第一资源占用第一时间单元上的一个或多个资源块集合的部分频域资源，第二资源占用第一时间单元上的一个或多个资源块集合的全部频域资源；其中，第二CPE起始点是第二预设CPE起始点，第二预设CPE起始点是预设CPE起始点集合中的一个。
基于上述方案，第二终端设备占用第一时间单元上的一个或多个资源块集合的全部频域资源(full RB set)，第一终端设备占用第一时间单元上的一个或多个资源块集合的部分频域资源(partial RB set)，则可以认为第二终端设备的第二传输的第二CPE起始点是第二预设起始点，第一终端设备的第一传输的CPE起始点#1则可以是预设的default的值。
结合第五方面，在第五方面的某些实现方式中，第二CPE起始点是根据第二传输的优先级或信道接入优先级CAPC确定的，第二传输的优先级或CAPC是根据第一预约消息确定的；或者，第二CPE起始点是根据第一预约消息的CPE起始点确定的。
基于上述方案，第一终端设备通过接收一个或多个预约消息，可以确定每个预约消息的传输所占用的CPE起始点，以及每个预约消息的预约资源的传输优先级，进而根据多个CPE起始点和对应的传输优先级确定第一CPE起始点。
第六方面，提供了一种通信装置，包括：收发单元，用于接收第一预约消息，第一预约消息指示第二终端设备预约的第二资源；处理单元，用于根据第一预约消息确定第二CPE起始点和第二资源对应的第二传输的优先级，第二CPE起始点与第二资源对应；处理单元，还用于根据第二传输的优先级、第二CPE起始点和第一传输的优先级，确定第一CPE起始点，其中，第一CPE起始点与第一资源对应，第一资源是第一终端设备为第一传输选择的资源，第一资源与第二资源在同一时间单元上的至少部分频域资源重合。
该收发单元可以执行前述第五方面中的接收和发送的处理，处理单元可以执行前述第五方面中除了接收和发送之外的其他处理。
第七方面，提供了一种通信装置，包括收发器、处理器和存储器，该处理器用于控制收发器收发信号，该存储器用于存储计算机程序，该处理器用于从存储器中调用并运行该计算机程序，使得该通信装置执行上述第一方面或第二方面或第五方面中任一种可能实现方式中的方法。
可选地，所述处理器为一个或多个，所述存储器为一个或多个。
可选地，所述存储器可以与所述处理器集成在一起，或者所述存储器与处理器分离设置。
可选地，该通信装置还包括，发射机(发射器)和接收机(接收器)。
第八方面，提供了一种通信系统，包括网络设备、第一终端设备和至少一个第二终端设备。
第七方面，提供了一种计算机可读存储介质，所述计算机可读存储介质存储有计算机程序或代码，所述计算机程序或代码在计算机上运行时，使得所述计算机执行上述第一方面或第二方面或第五方面中任一种可能实现方式中的方法。
第九方面，提供了一种芯片，包括至少一个处理器，所述至少一个处理器与存储器耦合，该存储器用于存储计算机程序，该处理器用于从存储器中调用并运行该计算机程序，使得安装有该芯片系统的装置执行上述第一方面或第二方面或第五方面中任一种可能实现方式中的方法。
其中，该芯片可以包括用于发送信息或数据的输入电路或者接口，以及用于接收信息或数据的输出电路或者接口。
第十方面，提供了一种计算机程序产品，所述计算机程序产品包括：计算机程序代码，当所述计算机程序代码被装置运行时，使得所述装置执行上述第一方面或第二方面或第五方面中任一种可能实现方式中的方法。
附图说明
图1和图2是适用于本申请实施例的无线通信系统的示意图。
图3是本申请实施例提供的不同终端设备进行资源选择的示意图。
图4是本申请实施例提供的通信方法400的流程示意图。
图5是本申请实施例提供的预留空和重评估检查的结果示意图。
图6是本申请实施例提供的通信方法600的流程示意图。
图7至图9是本申请实施例提供的资源选择的示意图。
图10是本申请实施例提供的不同终端设备进行资源选择的示意图。
图11是本申请实施例提供的通信方法1100的流程示意图。
图12至图13是本申请实施例提供的资源选择的示意图。
图14是本申请实施例提供的通信装置1000的结构示意图。
图15是本申请实施例提供的通信装置2000的结构示意图。
图16是本申请实施例提供的芯片系统3000的结构示意图。
具体实施方式
下面将结合附图，对本申请实施例中的技术方案进行描述。
本申请提供的技术方案可以应用于各种通信系统，例如：第五代(5th generation，5G)或新无线(new radio，NR)系统、长期演进(long term evolution，LTE)系统、LTE频分双工(frequency division duplex，FDD)系统、LTE时分双工(time division duplex，TDD)系统等。本申请提供的技术方案还可以应用于未来的通信系统，如第六代(6th generation，6G)移动通信系统。本申请提供的技术方案还可以应用于设备到设备(device to device，D2D)通信，车到万物(vehicle-to-everything，V2X)通信，机器到机器(machine to machine，M2M)通信，机器类型通信(machine type communication，MTC)，以及物联网(internet of things，IoT)通信系统或者其他通信系统。
作为示例，V2X通信可以包括：车与车(vehicle-to-vehicle，V2V)通信、车与路侧基础设施(vehicle-to-infrastructure，V2I)通信、车与行人(vehicle-to-pedestrian，V2P)通信、车与网络(vehicle-to-network，V2N)通信。V2V指的是车辆间的通信。V2P指的是车辆与人(包括行人、骑自行车的人、司机、或乘客等)的通信。V2I指的是车辆与基础设施的通信，基础设施例如路侧单元(road side unit，RSU)或者网络设备。其中，RSU包括两种类型：终端类型的RSU，由于布在路边，该终端类型的RSU处于非移动状态，不需要考虑移动性；基站类型的RSU，可以给与之通信的车辆提供定时同步及资源调度。V2N指的是车辆与网络设备的通信。可以理解，上述为示例性说明，本申请实施例不予限性。例如，V2X还可包括目前3GPP的Rel-16及后续版本的基于NR系统的V2X通信等。
本申请实施例中的终端设备也可以称为用户设备(user equipment，UE)、接入终端、用户单元、用户站、移动站、移动台、远方站、远程终端、移动设备、用户终端、终端、无线通信设备、用户代理或用户装置。
终端设备可以是一种向用户提供语音/数据的设备，例如，具有无线连接功能的手持式设备、车载设备等。目前，一些终端的举例为：手机(mobile phone)、平板电脑、笔记本电脑、掌上电脑、移动互联网设备(mobile internet device，MID)、可穿戴设备，虚拟现实(virtual reality，VR)设备、增强现实(augmented reality，AR)设备、工业控制(industrial control)中的无线终端、无人驾驶(self driving)中的无线终端、远程手术(remote medical surgery)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、蜂窝电话、无绳电话、会话启动协议(session initiation protocol，SIP)电话、无线本地环路(wireless local loop，WLL)站、个人数字助理(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、可穿戴设备，5G网络中的终端设备或者未来演进的公用陆地移动通信网络(public land mobile network，PLMN)中的终端设备等，本申请实施例对此并不限定。
作为示例而非限定，在本申请实施例中，该终端设备还可以是可穿戴设备。可穿戴设备也可以称为穿戴式智能设备，是应用穿戴式技术对日常穿戴进行智能化设计、开发出可以穿戴的设备的总称，如眼镜、手套、手表、服饰及鞋等。可穿戴设备即直接穿在身上，或是整合到用户的衣服或配件的一种便携式设备。可穿戴设备不仅仅是一种硬件设备，更是通过软件支持以及数据交互、云端交互来实现强大的功能。广义穿戴式智能设备包括功能全、尺寸大、可不依赖智能手机实现完整或者部分的功能， 例如：智能手表或智能眼镜等，以及只专注于某一类应用功能，需要和其它设备如智能手机配合使用，如各类进行体征监测的智能手环、智能首饰等。
本申请实施例中，用于实现终端设备的功能的装置，即终端装置，可以是终端设备，也可以是能够支持终端设备实现该功能的装置，例如芯片系统或芯片，该装置可以被安装在终端设备中。本申请实施例中，芯片系统可以由芯片构成，也可以包括芯片和其他分立器件。
本申请实施例中的网络设备可以是用于与终端设备通信的设备，该网络设备也可以称为接入网设备或无线接入网设备，如网络设备可以是基站。本申请实施例中的网络设备可以是指将终端设备接入到无线网络的无线接入网(radio access network，RAN)节点(或设备)。基站可以广义的覆盖如下中的各种名称，或与如下名称进行替换，比如：节点B(NodeB)、演进型基站(evolved NodeB，eNB)、下一代基站(next generation NodeB，gNB)、中继站、接入点、传输点(transmitting and receiving point，TRP)、发射点(transmitting point，TP)、主站、辅站、多制式无线(motor slide retainer，MSR)节点、家庭基站、网络控制器、接入节点、无线节点、接入点(access point，AP)、传输节点、收发节点、基带单元(baseband unit，BBU)、射频拉远单元(remote radio unit，RRU)、有源天线单元(active antenna unit，AAU)、射频头(remote radio head，RRH)、中心单元(central unit，CU)、分布式单元(distributed unit，DU)、定位节点等。基站可以是宏基站、微基站、中继节点、施主节点或类似物，或其组合。基站还可以指用于设置于前述设备或装置内的通信模块、调制解调器或芯片。基站还可以是移动交换中心以及D2D、V2X、M2M通信中承担基站功能的设备、6G网络中的网络侧设备、未来的通信系统中承担基站功能的设备等。基站可以支持相同或不同接入技术的网络。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。
基站可以是固定的，也可以是移动的。例如，直升机或无人机可以被配置成充当移动基站，一个或多个小区可以根据该移动基站的位置移动。在其他示例中，直升机或无人机可以被配置成用作与另一基站通信的设备。
在一些部署中，本申请实施例所提及的网络设备可以为包括CU、或DU、或包括CU和DU的设备、或者控制面CU节点(中央单元控制面(central unit-control plane，CU-CP))和用户面CU节点(中央单元用户面(central unit-user plane，CU-UP))以及DU节点的设备。
本申请实施例中，用于实现网络设备的功能的装置，可以是网络设备，也可以是能够支持网络设备实现该功能的装置，例如芯片系统或芯片，该装置可以被安装在网络设备中。本申请实施例中，芯片系统可以由芯片构成，也可以包括芯片和其他分立器件。
网络设备和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、气球和卫星上。本申请实施例中对网络设备和终端设备所处的场景不做限定。
需要说明的是，本申请技术方案主要应用在侧行传输场景，使用的频带包括但不限于非授权频谱，非授权频谱包括2.4GHz附近的频带，以及5.8GHz附近的频带等。在本申请实施例中，终端设备和接入网设备能够使用非授权频谱资源进行无线通信(例如，传输上行信息或传输下行信息)。通信系统可以采用授权辅助接入(licensed-assisted access，LAA)、双连接(dual connectivity，DC)、非授权辅助接入(standalone)技术等。
下面结合图1和图2简单介绍适用于本申请实施例的通信系统，如下。
图1和图2是适用于本申请实施例的无线通信系统的一示意图。如图1和图2所示，该无线通信系统可以包括至少一个终端设备，如图所示的UE1、UE2、UE3、UE4、UE5。可选地，该无线通信系统还可以包括至少一个网络设备，如图所示的网络设备。
网络设备和终端设备之间可进行通信。如网络设备和终端设备之间可通过Uu接口进行通信，网络设备和终端设备之间通信的链路(link)可记为Uu链路。如图1的(a)或图2的(a)所示，网络设备和UE1之间可直接通信，如图1的(b)或图2的(b)所示，网络设备和UE1之间也可通过UE2进行通信；类似地，网络设备和UE2之间可直接通信，网络设备和UE2之间也可通过UE1进行通信。可以理解，其中，Uu链路表征了终端设备和网络设备间的一种连接关系，是一个逻辑概念，而非一个物理实体。主链路仅是为区分做的命名，其具体命名不对本申请的保护范围造成限定。
终端设备和终端设备之间也可进行通信。例如，终端设备和终端设备之间可以直接通信，如图1的(a)至图1的(c)、图2的(a)至图2的(c)所示，UE1和UE2之间可以直接通信。再例如，终 端设备和终端设备之间可以通过其他设备，如网络设备或终端设备，进行通信，如图1的(a)所示，UE1和UE2之间可以通过网络设备进行通信，又如图1的(d)、图2的(d)所示，UE1和UE2之间可以通过UE3进行通信。终端设备和终端设备之间通信的接口可记为基于邻近服务通信5(proximity-based services communication 5，PC5)接口，终端设备与终端设备之间通信多链路可记为侧行链路(sidelink，SL)，终端设备与终端设备之间的通信也可记为SL通信。侧行链路，也可称为边链路或副链路等。可以理解，其中，侧行链路表征了终端设备和终端设备间的一种连接关系，是一个逻辑概念，而非一个物理实体。侧行链路仅是为区分做的命名，其具体命名不对本申请的保护范围造成限定。
设备之间可以进行单播通信，如终端设备之间可以进行单播通信。单播是指：一个发送终端和一个接收终端组成一个单播连接对。例如，以图1为例，UE1与UE2之间可以进行单播通信。
设备之间可以进行组播通信，如终端设备之间可以进行组播通信。组播是指：一个发送终端和至少一个接收终端组成一个组播连接对。例如，以图2为例，UE1与UE2、UE4以及UE5之间可以进行组播通信。如图2的(a)所示，网络设备和UE1之间可直接通信，一个UE1可与多个UE，如UE2、UE4以及UE5之间可以进行组播通信。UE1与多个UE之间进行组播通信时，可以在网络覆盖下进行，如图2的(a)或图2的(b)所示，或者也可以在无网络覆盖下进行，如图2的(c)或图2的(d)所示。可以理解，图2中以UE1与三个UE进行组播通信为例进行了示例性说明，对此不予限制，例如UE1可以与更多数量的UE进行组播通信。
作为示例，终端设备和终端设备之间的SL通信，可以用于车联网或智能交通系统(intelligent transportation system，ITS)，如上文所述的V2X通信中。
可选地，终端设备和终端设备之间的SL通信，可以在网络覆盖下进行，也可以在无网络覆盖下进行。如图1的(a)至图1的(b)、图2的(a)至图2的(b)所示，UE1和其它UE之间可以在网络覆盖下进行通信；或者，如图1的(c)至图1的(d)、图2的(c)至图2的(d)所示，UE1和其它UE之间可以在网络覆盖范围之外(out-of-coverage)进行通信。
可选地，终端设备和终端设备之间SL通信时的配置信息，如终端设备和终端设备之间SL通信时的时频资源可以是网络设备配置或调度的，也可以是终端设备自主选择的，不予限制。
可以理解，图1和图2仅为便于理解而示例的简化示意图，该无线通信系统中还可以包括其他网络设备或者还可以包括其他终端设备，图1和图2中未予以画出。本申请实施例可以适用于发送端设备和接收端设备通信的任何通信场景。
需要说明的是，本申请实施例并未对本申请实施例提供的方法的执行主体的具体结构特别限定，只要能够通过运行记录有本申请实施例的提供的方法的代码的程序，以根据本申请实施例提供的方法进行通信即可，例如，本申请实施例提供的方法的执行主体可以是终端设备，或者，是终端设备中能够调用程序并执行程序的功能模块。
为便于理解本申请实施例，首先对本申请中涉及到的术语或技术做简单说明。
1、授权频谱和非授权频谱
无线通信系统使用的频谱分为两类，授权频谱(licensed spectrum)和非授权频谱(unlicensed spectrum)。在授权频谱中，UE可基于网络设备的调度使用频谱资源。在非授权频谱中，通信设备可按照竞争的方式使用频谱资源。在非授权频谱上的SL通信可以称为SL-U，在非授权频谱上的NR蜂窝通信可以称为NR-U。
一种可能的方式，通信设备通过先听后说(listen-before-talk，LBT)的方式竞争信道，进而使用非授权频谱资源。
2、非授权频谱的侧行链路(sidleink unlicense，SL-U)
SL-U主要是指在非授权频谱(unlicense band)中进行SL传输。针对非授权频谱，标准引入两种接入机制包括Type 1和Type 2。其中，Type 1用于抢占信道的场景，需要进行LBT，即在传输之前需要监听。这里的监听可以是能量检测，即在9μs上检测能量，如果超过门限表示有UE占用该资源；反之，如果不超过门限，则意味着没有UE占用该资源。Type 2用于分享其他UE经过Type 1方式抢到的传输资源。例如，UE1用Type 1抢到了一段时间内的传输机会(即信道占用时间(channel occupancy time，COT))，除了自己占用的传输时间外，可指示其他UE采用Type 2方式接入UE1所占用的COT内剩余的传输机会。
需要说明的是，Type 2进一步包括Type 2A和Type 2B，Type 2A表示在其他UE的传输结束后的间隔25μs后占用信道，即通过感知信道发现25μs内无其他UE使用，则可以占用该信道。Type 2B表示在其他UE的传输结束后的间隔16μs后占用信道，与Type 2A的差别在于9μs，即一个感知时隙的时长。
对于非授权频谱，在传输之前，UE必须在每个20MHz信道上执行LBT，该20MHz的信道即可被称为LBT信道。为了避免不同信道的干扰，UE不能在整个20MHz带宽上发送数据，而是留有一部分频带资源作为保护带宽(guard band)，只在剩余的这部分频域资源发送数据，这部分可用的资源被称作资源块集合(resource block set，RB set)。当UE在连续多个20MHz信道上执行LBT操作并成功接入信道时，两个RB set间的保护带宽可以用来传输数据，提高资源利用率。
应理解，不管是Type 1LBT还是Type 2LBT，都是通过能量检测判断信道是否空闲。若是有两个传输块对应的资源在时域上比较接近，在频率上属于同一个信道，则时间上靠前的传输块可能会使得时间上靠后的传输块LBT失败，从而无法发送传输块。本申请中可以将该现象称为UE间阻塞(inter-UE blocking)，该现象将导致UE传输失败。
3、SL资源池(resouce pool)
在NR中，SL传输是基于资源池进行的。每个资源池包含一个或多个子信道(subchannel)，同一资源池中的各子信道占用的频域资源(即物理资源块(physical resource block，PRB)个数)是相同的，不同资源池的各子信道所占用的频域资源可能不同。
应理解，资源池是一个逻辑上的概念，一个资源池包括多个物理资源，其中任意一个物理资源是用于传输数据的。每个UE在进行数据的传输时候都需要从资源池中选择一个资源。这个资源选择的过程，包括以下两种情况：
(1)UE受到网络设备的控制，根据网络设备的指示信息，从资源池中选择一个资源进行数据传输，又称为Mode 1方式；
(2)UE自主从资源池中选择一个资源进行数据传输，又称为Mode2方式，即UE有自主决定资源选择和资源分配的机会。UE可以根据感知频谱的占用情况，把一些被占用的或者干扰较大的资源排除掉，在空闲或者干扰较低的资源上选择传输资源。
资源池中包括至少一个LBT信道。例如，资源池包括一个LBT信道，信道带宽为20MHz，资源池带宽为20MHz。再例如，资源池包括2个LBT信道，信道带宽为20MHz，资源池带宽为40MHz。再例如，资源池包括5个LBT信道，信道带宽为20MHz，资源池带宽为100MHz。
4、CPE长度
应理解，不同传输的优先级(例如，信道接入优先级(channel access priority class，CAPC)或priority)对应不同的CPE长度，优先级越小(CAPC或priority的值越小)，对应的CPE长度越长。SL-U作为一个同步系统，只能在指定的位置进行接入。因此，为了更好地占用信道，UE在接入信道之前，可以发送CPE来抢占信道，具体抢占的时间长度与CAPC值有关，可以根据标准规定，也可以UE内部实现。
5、时域单元和频域单元
数据或信息可以通过时频资源来承载。
在时域上，时频资源可以包括一个或多个时域单元(或者，也可以称为时间单元)。一个时域单元可以是一个符号，或者一个迷你时隙(mini-slot)，或者一个时隙(slot)，或者部分时隙(partial slot)，或者一个子帧(subframe)，或者一个无线帧(frame)等。
在频域上，时频资源可以包括一个或多个频域单元。一个频域单元可以是一个资源单元(resource element，RE)，或者一个资源块(resource block，RB)，或者一个子信道(subchannel)，或者一个资源池(resource pool)，或者一个带宽(bandwidth)，或者一个带宽部分(bandwidth part，BWP)，或者一个载波(carrier)，或者一个信道(channel)，或者一个交错(interlace)RB等。
6、优先级
UE可能同时发送了多个业务，多个业务的优先级可能不一样。因此，UE的优先级也可以描述为UE的业务优先级。UE的业务优先级具体而言是UE的发送优先级(transmission priority)。业务优先级，还可以称为L1优先级(L1priority)、物理层优先级、侧行链路控制信息(sidelink control information， SCI)中携带的优先级、SCI关联的物理侧行共享信道(physical side link share channel，PSSCH)对应的优先级、发送优先级、发送PSSCH的优先级、用于资源选择的优先级、逻辑信道的优先级、逻辑信道的最高等级的优先级。其中，优先级等级与优先级数值可具有某种对应关系，例如优先级等级越高对应的优先级数值越低，或者优先级等级越低对应的优先级数值越低。以优先级等级越高对应的优先级数值越低为例，优先级数值取值范围可以为1-8的整数或者0-7的整数。若以优先级数值取值范围为1-8，则优先级的值为1时，代表最高等级的优先级。
7、信道接入优先级CAPC
优先级等级与优先级数值可具有某种对应关系，例如优先级等级越高对应的优先级数值越低，或者优先级等级越低对应的优先级数值越低。优先级数值取值范围可以为1～4，也是越小的值优先级越高。
在进行Type 1传输时，UE根据不同的优先级决定进行LBT的时长，如TS 37.213的Table 4.2.1-1所述，CAPC优先级1时，COT最长为2ms，CAPC优先级为2时，COT时长最大为4ms，CAPC优先级为3或4时，COT最大时长为6ms或10ms。
上面对本申请中涉及到的术语做了简单说明，下文实施例中不再赘述。此外，上文关于术语的说明，仅是为便于理解进行的说明，其对本申请实施例的保护范围不造成限定。
在Mode 2场景的SL通信系统中，终端设备会自发地进行资源感知和资源选择(或者说资源预约)，来确定传输所占据的时频资源。UE进行资源感知和资源选择的方法可以包括如下步骤：
步骤1：UE通过对物理侧行控制信道(physical sidelink control channel，PSCCH)解码和对RSRP值进行测量，在资源感知窗内感知资源，或者说，进行资源感知。
步骤2：UE根据资源感知窗内资源的感知结果，通过比较RSRP阈值和RSRP测量值，判断是否从资源选择窗内排除资源，从而形成候选资源集合。例如，在资源感知窗内，资源1的RSRP测量值高于RSRP阈值，则排除资源1中SCI指示的预留资源中落入资源选择窗内的资源。反之，则不排除资源1中SCI指示的预留资源中落入资源选择窗内的资源。其中，RSRP阈值与SCI指示的业务优先级以及UE自身的业务优先级有关。预留资源可以理解为是某个UE(例如，UE#1)预先指定或占用的用于该UE#1后续发送信息的资源，从而，其他UE(例如，UE#2)可根据资源感知结果，从该UE#2的资源选择窗内排除该预留资源。
在资源排除结束后，物理层将考察剩余的可用资源数是否大于或者等于M*X％，其中M为资源选择窗中所有资源的数目，X％为预先约定的百分数，如20％、35％、50％等。若剩余可用资源数不足M*X％，则将RSRP阈值抬高3dB，重复上述流程，直到剩余的可用资源数大于或者等于M*X％。物理层将把资源选择窗中剩余的可用资源上报给MAC层，由MAC层在可用资源中随机选择发送的资源。其中，资源选择窗中剩余的可用资源可以理解为候选资源集合。
步骤3：UE从候选资源集合中选择可用于传输SL信息的资源，其中，UE传输的SL信息包括初传信息和若干个重传信息。
步骤4：当满足一定条件，例如该UE的预留资源与其他UE的预留资源重合，则UE触发资源重选。
图3是本申请实施例提供的不同终端设备进行资源选择的示意图。如图3的(a)所示，在同一个时隙上，UE-x预约的资源#2与UE-1选择的资源#1重合，UE-x所预约的资源#2对应的CPE#2长度，大于UE-1所预约的资源#1对应的CPE#1长度，则该RB set(例如，20MHz)上的其他subchannel不可用，UE-1的传输会受到UE-x的inter-UE blocking影响。如图3的(b)所示，在同一个时隙上，UE-x预约的资源#2与UE-1选择的资源#1重合，UE-x所预约的资源#2对应的CPE#2长度，小于UE-1所预约的资源#1对应的CPE#1长度，如果UE1在该时隙上继续传输，则UE1的传输会影响到该RB set(例如，20MHz)内UE-x的业务传输，即UE-x的传输会受到UE-1的inter-UE blocking影响。
当前，在SL-U通信系统中，资源选择过程并未考虑CPE长度对传输的影响，导致终端设备选择的资源可能被邻频的传输阻断，或者阻断邻频的传输，降低用户的业务体验和传输性能。
有鉴于此，本申请提供了一种通信方法和装置，通过在预留空和重评估检查的时刻，第一终端设备根据感知到的预约消息，比较不同预约资源对应的CPE长度，进而确定是否进行资源重选(即根据CPE长度更新资源重选的条件)，或者调整传输所用的第一CPE长度。该方法能够针对不同的终端设 备预约同一资源的情况，避免不同终端设备选择的资源发生碰撞，保证终端设备的传输效率，提高频谱的利用率，保证用户的业务传输和体验。
为了便于理解本申请实施例，作出以下几点说明：
第一、在本申请中，如果没有特殊说明以及逻辑冲突，不同的实施例之间的术语和/或描述具有一致性、且可以相互引用，不同的实施例中的技术特征根据其内在的逻辑关系可以组合形成新的实施例。
第二、在本申请中，“至少一个”是指一个或者多个，“多个”是指两个或两个以上。“和/或”，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的情况，其中A，B可以是单数或者复数。在本申请的文字描述中，字符“/”一般表示前后关联对象是一种“或”的关系。“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和c中的至少一项(个)，可以表示：a，或，b，或，c，或，a和b，或，a和c，或，b和c，或，a、b和c。其中a、b和c分别可以是单个，也可以是多个。
第三、在本申请中，“第一”、“第二”以及各种数字编号(例如，#1、#2等)指示为了描述方便进行的区分，并不用来限制本申请实施例的范围。例如，区分不同的消息等，而不是用于描述特定的顺序或先后次序。应理解，这样描述的对象在适当情况下可以互换，以便能够描述本申请的实施例以外的方案。
第四、在本申请中，“当……时”、“在……的情况下”以及“如果”等描述均指在某种客观情况下设备会做出相应的处理，并非是限定时间，且也不要求设备在实现时一定要有判断的动作，也不意味着存在其它限定。
第五、在本申请中，术语“包括”和“具有”以及他们的任何变形，意图在于覆盖不排他的包含，例如，包含了一系列步骤或单元的过程、方法、系统、产品或设备不必限于清楚地列出的那些步骤或单元，而是可包括没有清楚地列出的或对于这些过程、方法、产品或设备固有的其它步骤或单元。
第六、在本申请中，“用于指示”可以包括用于直接指示和用于间接指示。当描述某一指示信息用于指示A时，可以包括该指示信息直接指示A或间接指示A，而并不代表该指示信息中一定携带有A。
本申请实施例涉及的指示方式应理解为涵盖可以使得待指示方获知待指示信息的各种方法。待指示信息可以作为整体一起发送，也可以分成多个子信息分开发送，而且这些子信息的发送周期和/或发送时机可以相同，也可以不同，本申请对具体的发送方法不作限定。
本申请实施例中的“指示信息”可以是显式指示，即通过信令直接指示，或者根据信令指示的参数，结合其他规则或结合其他参数或通过推导获得。也可以是隐式指示，即根据规则或关系，或根据其他参数，或推导获得。本申请对此不作具体限定。
第七、在本申请中，“协议”可以是指通信领域的标准协议，例如可以包括5G协议、新空口(new radio，NR)协议以及应用于未来的通信系统中的相关协议，本申请对此不做限定。“预配置”可以包括预先定义。例如，协议定义。其中，“预先定义”可以通过在设备中预先保存相应的代码、表格或其他可用于指示相关信息的方式来实现，本申请对于其具体的实现方式不做限定。
第八、在本申请中，“存储”可以是指保存在一个或者多个存储器中。所述一个或者多个存储器可以是单独的设置，也可以是集成在编码器或者译码器、处理器、或通信装置中。所述一个或者多个存储器，也可以是一部分单独设置，一部分集成在译码器、处理器、或通信装置中。存储器的类型可以是任意形式的存储介质，本申请并不对此限定。
第九、在本申请中，“通信”还可以描述为“数据传输”、“信息传输”、“数据处理”等。“传输”包括“发送”和“接收”，本申请对此不作限定。
第十、在本申请中，“第一终端设备”可以描述为“UE1”，“第二终端设备”可以描述为“UE2”，以此类推，本申请不再特殊强调。
下文将结合附图详细说明本申请实施例提供的通信方法。本申请提供的实施例可以适用于发送端设备和接收端设备通信的任何通信场景，如可以应用于上述图1和图2所示的通信系统中。
图4是本申请实施例提供的通信方法400的流程示意图。如图4所示，该方法包括如下多个步骤。
S410，第一终端设备接收预约消息。
其中，该预约消息指示第二终端设备预约的第二资源。
可选地，第一终端设备接收预约消息，可以是第一终端设备从第二终端设备接收预约消息，或者也可以是第一终端设备从网络设备接收预约消息，即该预约消息由网络设备转发给第一终端设备，本申请对第一终端设备获取预约消息的方式不作限定。
示例性的，UE1感知、监听、或接收UE2发送的预约消息。UE2的预约消息可以显示或者隐式地指示UE2预约的第二资源。其中，第二资源包括但不限于：预留间隔信息、频域资源信息、时域资源信息、优先级信息。具体地，预留间隔信息可以是周期预留间隔信息；频域资源信息用于指示预约的频域资源位置，包括：起始频域位置及占用的频域资源大小等信息，例如频域资源信息包括以下信息的一种或多种：以交错方式传输PSCCH和/或PSSCH、交错的起始位置、交错的个数、以非交错(如子信道)方式传输PSCCH和/或PSSCH；时域资源信息用于指示预约的时域资源位置，例如时域资源信息包括以下信息的一种或多种：在多个时隙上传输一个或者多个初传和/或重传、一个或者多个初传和或重传的时间间隔信息、在连续的时隙上传输个或者多个初传和或重传、初传和或重传个数的信息；优先级信息包括priority或CAPC等。
需要说明的是，本申请对预约消息的数量，以及发送预约消息的终端设备的数量不作具体限定。即预约消息可以是一个或多个。当预约消息有多个时，该多个预约消息可以是同一个终端设备发送的，用于指示该终端设备预约的多个资源；或者，该多个预约消息也可以是不同终端设备发送的，用于指示每个终端设备所预约的资源等。
S420，第一终端设备根据预约消息确定第二CPE长度。
其中，第二CPE长度与第二资源对应。
可选地，第一终端设备根据预约消息确定第二CPE长度，可以是第一终端设备根据第二资源对应的传输的优先级确定第二CPE长度；或者，也可以是第一终端设备根据预约消息所占用的CPE长度确定第二CPE长度。需要说明的是，这里传输的优先级包括但不限于：priority或CAPC。
应理解，为了更好地占用信道，终端设备在接入信道之前，可以发送CPE来抢占信道，具体抢占的时间长度可以与CAPC值，和/或物理层优先级的值有关，可以根据标准规定，也可以由第一终端设备内部实现。其中，第二CPE长度与第二资源对应，可以理解为第二CPE长度在前一时间单元的gap符号上传输，当前时间单元则用于第二资源的传输。
示例性的，本申请中的时间单元可以包括但不限于：时隙，符号，或者微时隙等，表示传输的长度(或者说，传输时长)，例如1ms。以下，为便于理解技术方案，以时隙作为时间单元为例，对本申请的通信方法进行说明。
S430，第一终端设备根据第一CPE长度和第二CPE长度，确定第三资源或者调整第一CPE长度。
其中，第一CPE长度是根据第一终端设备的第一传输的优先级确定的，且第一CPE长度与第一资源对应，第一资源是第一终端设备已经为第一传输选择的资源，第一资源与第二资源的至少部分时域资源重合，第三资源的部分或全部资源用于第一终端设备进行第一传输。
应理解，不同传输的优先级(CAPC或priority)对应不同的CPE长度。例如，第一终端设备的第一传输对应第一CPE长度，第二终端设备的第二传输对应第二CPE长度。其中，第一CPE长度与第一资源对应，可以理解为第一CPE长度在前一时隙的gap符号上传输，当前时隙则用于第一资源的传输。
需要说明的是，由于第一资源与第二资源的至少部分时域资源重合，例如时隙m，则第一CPE长度与第二CPE长度(位于时隙m-1上)互相影响，例如当第一CPE长度小于第二CPE长度时，若第一终端设备仍然按照第一CPE长度进行传输，则第一终端设备的LBT将无法通过，进而导致第一终端设备的传输被阻塞，因此第一终端设备可以排除该时隙m上的资源，存在确定第三资源。
在本申请中，第三资源在物理层协议中，实际上是指用于第一终端设备进行第一传输的候选资源，第一终端设备需要上报至MAC层，进一步在MAC层进行资源选择，即从第三资源中选择部分或全部资源，用于第一终端设备进行第一传输。
下面，在第一资源与第二资源的至少部分频域资源重合的情况下，针对不同的应用场景，比较预约资源对应的CPE长度，详细说明第一终端设备确定第三资源的具体实现方式。
在一种可能的实现方式中，在第一CPE长度小于第二CPE长度的情况下，第一终端设备确定第三资源。
示例性的，UE1选择的第一资源位于时隙m，UE1在m-T3时刻进行预留空和重评估检查，感知到UE2预约的第二资源也位于该时隙m上，假设第一资源与第二资源位于同一个RB set内，该RB set的带宽可以是20MHz、某个预设值，或某个配置值。例如，该RB set包括4个子信道，则每个子信道的带宽为5MHz。如果第二资源对应的第二CPE长度大于第一资源对应的第一CPE长度，则UE1的传输会受到UE2的inter-UE blocking的影响，如果UE1继续占用该时隙m，使用第一CPE长度抢占信道时LBT将无法通过，因此UE1需要触发资源重选，得到第三资源。例如，UE1不使用该时隙m上的第一资源进行第一传输。应理解，由于第一CPE长度小于第二CPE长度，因此该方式中UE1无需考虑该预约消息的RSRP限制。
其中，预留空和重评估检查的场景可参考现有标准，如在第一终端设备的第一传输的优先级低于第二终端设备预约的第二资源对应的传输的优先级的情况下；或者在第一终端设备的第一传输的优先级低于某一优先级阈值，且第二终端设备的传输的优先级高于该优先级阈值的情况下。
可选地，该第一CPE长度可以是UE1感知到的该时隙m上所有预约资源对应的CPE长度最长的，也就是说，该第一CPE长度是对应该时隙m上的最高优先级传输。
应理解，该实现方式对该时域资源上的频域资源是否重合不作具体限定。
在另一种可能的实现方式中，在第一CPE长度小于第二CPE长度，且第一资源与第二资源的至少部分频域资源重合的情况下，第一终端设备确定第三资源。
示例性的，UE1选择的第一资源位于时隙m，UE1在m-T3时刻进行预留空和重评估检查，感知到UE2预约的第二资源也位于该时隙m上，假设第一资源与第二资源位于同一个RB set内，该RB set的带宽可以是20MHz、某个预设值，或某个配置值。例如，该RB set包括4个子信道，则每个子信道的带宽为5MHz，第一资源的频域资源对应子信道0和子信道1，第二资源对应子信道1和子信道2。如果该时隙m上UE2预约的第二资源对应的第二CPE长度大于UE1选择的第一资源对应的第一CPE长度，则UE1的传输会受到UE2的inter-UE blocking的影响，如果UE1继续占用该时隙m，使用第一CPE长度抢占信道时LBT将无法通过，因此UE1需要触发资源重选，得到第三资源。例如，UE1不使用该时隙m上的第一资源进行第一传输。第一资源与第二资源存在部分重合的频域资源(例如，子信道1)。应理解，由于第一CPE长度小于第二CPE长度，因此该方式中UE1无需考虑该预约消息的RSRP限制。
在又一种可能的实现方式中，在第一CPE长度等于第二CPE长度，第一资源与第二资源的至少部分频域资源重合，且预约消息的参考信号的接收功率RSRP高于第一阈值的情况下，第一终端设备确定第三资源。
示例性的，UE1选择的第一资源位于时隙m，UE1在m-T3时刻进行预留空和重评估检查，感知到UE2预约的第二资源也位于该时隙m上，假设第一资源与第二资源位于同一个RB set内，该RB set的带宽可以是20MHz、某个预设值，或某个配置值。如果该时隙m上UE2预约的第二资源对应的第二CPE长度等于UE1选择的第一资源对应的第一CPE长度，则UE1和UE2可以同时使用该时隙m上的资源进行传输，且互相不会产生阻塞。进一步地，如果第一资源与第二资源频域资源有部分或全部重合，UE2的预约消息的RSRP大于第一阈值，则UE1需要触发资源重选，得到第三资源。例如，UE1不使用该时隙m上的第一资源进行第一传输。
下面，在第一资源与第二资源的至少部分频域资源重合的情况下，针对不同的应用场景，比较预约资源对应的CPE长度，详细说明第一终端设备调整第一CPE长度的具体实现方式。
在一种可能的实现方式中，第一终端设备根据第一CPE长度和第二CPE长度，调整第一终端设备在第一时间单元上的第一CPE长度为第三CPE长度，第一时间单元是第一资源和第二资源的重合部分的时域资源，第三CPE长度大于或等于第二CPE长度。
应理解，该实现方式中的第一资源和第二资源在频域上无重合。第一终端设备调整在第一时间单元上的第一CPE长度，是指第一终端设备调整第一时间单元上预约的第一资源对应的第一CPE长度，其中，第一CPE长度在第一时间单元的前一时隙的gap符号上传输。
示例性的，UE1选择的第一资源位于时隙m(即，第一时间单元)，UE1在m-T3时刻进行预留空和重评估检查，感知到UE2预约的第二资源也位于该时隙m上，假设第一资源与第二资源位于同一个RB set内，该RB set的带宽可以是20MHz、某个预设值，或某个配置值。如果该时隙m上UE2预约 的第二资源对应的第二CPE长度大于UE1选择的第一资源对应的第一CPE长度，则UE1的传输会受到UE2的inter-UE blocking的影响，如果UE1继续占用该时隙m，使用第一CPE长度抢占信道时LBT将无法通过，因此UE1需要增加第一CPE长度为第三CPE长度，以保证UE1可以在该时隙m上进行第一传输。
可选地，第三CPE长度大于第二CPE长度，若UE1感知到仅有一个UE(例如UE2)预约该时隙m上的资源进行传输，则UE1可以在该时隙m上进行第一传输，但是会造成对UE2的传输的阻塞。
可选地，第三CPE长度等于第二CPE长度，若UE1感知到仅有一个UE(例如UE2)预约该时隙m上的资源进行传输，则UE1和UE2可以同时在该时隙m上进行传输，互相不会造成传输阻塞，保证用户的传输效率，提高频谱利用率。
示例性的，UE1选择的第一资源位于时隙m(即，第一时间单元)，UE1在m-T3时刻进行预留空和重评估检查，感知到UE2预约的第二资源也位于该时隙m上，假设第一资源与第二资源位于同一个RB set内，该RB set的带宽可以是20MHz、某个预设值，或某个配置值。如果该时隙m上UE2预约的第二资源对应的第二CPE长度小于UE1选择的第一资源对应的第一CPE长度，则UE2的传输会受到UE1的inter-UE blocking的影响，此时UE1可以继续占用该时隙m上的资源进行第一传输，对第一CPE长度不作调整。或者，UE1也可以将第一CPE长度调短至第三CPE长度，以保证UE2可以在该时隙m上进行传输。
可选地，第三CPE长度小于第二CPE长度，若UE1感知到仅有一个UE(例如UE2)预约该时隙m上的资源进行传输，则UE2可以在该时隙m上进行传输，但是会造成对UE1的传输的阻塞。
可选地，第三CPE长度等于第二CPE长度，若UE1感知到仅有一个UE(例如UE2)预约该时隙m上的资源进行传输，则UE1和UE2可以同时在该时隙m上进行传输，互相不会造成传输阻塞，保证用户的传输效率，提高频谱利用率。
在另一种可能的实现方式中，该方法还包括：第一终端设备根据预约消息确定第四CPE长度，第四CPE长度与第四资源对应，第四CPE长度大于第二CPE长度。进一步地，第一终端设备根据第一CPE长度、第四CPE长度和第二CPE长度，调整第一终端设备在第一时间单元上的第一CPE长度为第三CPE长度，第一时间单元是第一资源和第二资源的重合部分的时域资源，第三CPE长度大于或等于第四CPE长度。
应理解，该实现方式中的第一资源和第二资源(或第四资源)在频域上无重合。
示例性的，UE1选择的第一资源位于时隙m(即，第一时间单元)，UE1在m-T3时刻进行预留空和重评估检查，感知到UE2预约的第二资源也位于该时隙m上，假设第一资源与第二资源位于同一个RB set内，该RB set的带宽可以是20MHz、某个预设值，或某个配置值。如果该时隙m上UE4预约的第四资源对应的第四CPE长度大于UE1选择的第一资源对应的第一CPE长度，则UE1的传输会受到UE4的inter-UE blocking的影响，如果UE1继续占用该时隙m，使用第一CPE长度抢占信道时LBT将无法通过，因此UE1需要增加第一CPE长度为第三CPE长度。
可选地，第三CPE长度大于第四CPE长度，若UE1感知到有多个UE(例如，UE2和UE4)在该时隙m上预约资源，则UE1可以在该时隙m上进行第一传输，但是会造成对UE2和UE4的传输的阻塞。
可选地，第三CPE长度等于第四CPE长度，若UE1感知到有多个UE(例如，UE2和UE4)在该时隙m上预约资源，则UE1和UE4可以同时在该时隙m上进行传输，互相不会造成传输阻塞，但是会造成对UE2的传输的阻塞。
可选地，该第四CPE长度可以是UE1感知到的该时隙m上的所有预约资源对应的CPE长度中最长的。
示例性的，UE1选择的第一资源位于时隙m(即，第一时间单元)，UE1在m-T3时刻进行预留空和重评估检查，感知到UE2预约的第二资源也位于该时隙m上，假设第一资源与第二资源位于同一个RB set内，该RB set的带宽可以是20MHz、某个预设值，或某个配置值。如果UE4预约的第四资源对应的第四CPE长度小于UE1选择的第一资源对应的第一CPE长度，则UE4的传输会受到UE1的inter-UE blocking的影响，此时UE1可以继续占用该时隙m进行第一传输，对第一CPE长度不作调整。或者，UE1也可以将第一CPE长度调短至第三CPE长度。
可选地，第三CPE长度小于第四CPE长度，若UE1感知到有多个UE(例如，UE2和UE4)预约该时隙m上的资源进行传输，则UE4可以在该时隙m上进行传输，但是会造成对UE1的传输的阻塞。应理解，无论第三CPE长度与第二CPE长度的大小关系如何，UE4的传输都会造成对UE2的传输的阻塞。
可选地，第三CPE长度等于第二CPE长度，若UE1感知到有多个UE(例如，UE2和UE4)预约该时隙m上的资源进行传输，则UE1和UE4可以同时在该时隙m上进行传输，互相不会造成传输阻塞，但是会造成对UE2的传输的阻塞。
需要说明的是，本申请对UE1进行预留空和重评估检查，以及调整第一CPE长度的实现方式不作具体限定。例如，以避免UE1的传输被其他UE的传输阻塞为例，对UE1调整第一CPE长度的方式进行说明。
在一种示例中，UE1在感知该时隙m上所有的预约消息后，将所有预约消息所预约的资源对应的CPE长度进行比较，确定某一预约消息指示的传输的最高优先级对应的CPE长度为第四CPE长度，则UE1可以将第一CPE长度直接增加到第三CPE长度，该第三CPE长度大于或等于第四CPE长度，保证UE1可以在该时隙m上进行第一传输。
在另一种示例中，UE1在时隙m上每次感知到一个预约消息后，确定该预约消息所预约的资源对应的CPE长度，将该CPE长度与第一CPE长度进行比较，进而确定本次感知是否需要调整第一CPE长度。例如，在感知到第二CPE长度大于第一CPE长度的情况下，UE1可以将自己的第一CPE长度调整(增加)至第二CPE长度；紧接着，在感知到第五CPE长度小于UE1当前调整后的CPE长度的情况下，UE1继续保持当前调整后的CPE长度；进一步地，在感知到第四CPE长度大于UE1当前调整后的CPE长度的情况下，UE1可以将自己当前调整后的CPE长度调整(增加)至第三CPE长度，该第三CPE长度大于或等于第四CPE长度。依次类推，直至预留空和重评估检查完该时隙m上所有的预约消息。此时，UE1的CPE长度已经调整至该时隙m上最长的CPE长度，保证UE1可以在该时隙m上进行第一传输。
在又一种可能的实现方式中，在第一CPE长度大于或小于第二CPE长度，且预约消息的RSRP低于第一阈值的情况下，第一终端设备调整在第一时间单元上的第一CPE长度为第三CPE长度。
应理解，该实现方式中的第一资源和第二资源在频域上有至少部分重合。
示例性的，UE1选择的第一资源位于时隙m(即，第一时间单元)，第二CPE长度是时隙m上的所有预约消息所预约的资源对应的CPE长度最长，UE1在m-T3时刻进行预留空和重评估检查，假设第一资源与第二资源位于同一个RB set内，该RB set的带宽可以是20MHz、某个预设值，或某个配置值。若UE1感知到第二CPE长度大于第一CPE长度，第一资源与第二资源的至少部分频域资源重合，且预约消息的RSRP低于第一阈值，则UE1可以按照第二CPE长度(或大于第二CPE长度)进行传输，这样能够避免UE1的传输被UE2的传输阻塞；若UE1感知到第二CPE长度小于第一CPE长度，且预约消息的RSRP低于第一阈值，则UE1可以按照第二CPE长度(或小于第二CPE长度)进行传输，这样能够避免UE1的传输对UE2的传输造成阻塞。
在又一种可能的实现方式中，在第一CPE长度大于或小于第二CPE长度，且第一资源与第二资源的频域资源不重合的情况下，第一终端设备调整在第一时间单元上的第一CPE长度为第三CPE长度。
其中，第三CPE长度大于或等于第二CPE长度。需要指出的是，这里第一资源和第二资源的频域资源不重合是指第一资源和第二资源的频域资源完全不重合。
示例性的，UE1选择的第一资源位于时隙m(即，第一时间单元)，第二CPE长度是时隙m上的所有预约消息所预约的资源对应的CPE长度最长，UE1在m-T3时刻进行预留空和重评估检查，假设第一资源与第二资源位于同一个RB set内，该RB set的带宽可以是20MHz、某个预设值，或某个配置值。若UE1感知到第二CPE长度大于第一CPE长度，且第一资源与预约的资源的频域资源完全不重合，则UE1可以按照第二CPE长度(或大于第二CPE长度)进行传输，这样能够避免UE1的传输被UE2的传输阻塞；若UE1感知到第二CPE长度小于第一CPE长度，且第一资源与预约的资源的频域资源完全不重合，则UE1可以按照第二CPE长度(或小于第二CPE长度)进行传输能够避免UE1的传输对UE2的传输造成阻塞。
需要说明的是，该实现方式的应用场景是指，第一终端设备已经为第一传输选择了第一资源，通 过感知、监听、或接收其他终端设备的预约消息，确定其他终端设备预约的资源与第一终端设备选择的第一资源所在时隙有重合，即第一资源与第二资源的时域资源有部分重合或全部重合，例如当前时隙。
根据本申请提供的方案，第一终端设备通过比较第一CPE长度和感知到的其他CPE长度，进行资源重选(即，确定第三资源)或者调整第一CPE长度，进而确定是否继续占用不同终端设备预约的同一时隙进行第一传输，避免第一终端设备的传输被其他终端设备的传输阻塞(或者，避免第一终端设备的传输阻塞其他终端设备的传输)，提高第一终端设备的传输效率，避免频谱资源的不必要浪费。即第一终端设备在对资源进行预留空和重评估过程中，引入CPE长度作为重新进行资源选择的条件，或者调整第一CPE长度，提高频谱资源的利用率，以及保障终端设备的传输性能。
下面结合图5，对上述提供的通信方法400进行示例说明。
图5是本申请实施例提供的预留空和重评估检查的结果示意图。如图5的(a)所示，时隙n之前为感知窗，时隙n之后为资源选择窗，考虑到在时隙n之前，UE1感知到子信道0和子信道1上的资源分别被UE2和UE3预约，且UE1未感知到子信道2和子信道上的资源被预约，因此为了避免UE之间的传输阻塞，UE1为第一传输所选择的资源#1(对应的CPE长度为CPE#1)，可以位于时隙m上的对应子信道3和子信道2。其中，子信道2和子信道3可以理解为：UE1为第一传输所选择的资源#1的频域资源。应理解，在UE1进行第一传输之前，UE1需要在m-T3时刻进行预留空和重评估检查，如图5的(b)所示，UE1通过感知、监听、或接收其他UE(例如UE2、UE3、UE4和UE5)的预约消息，确定UE2、UE3和UE4同时预约了资源选择窗内的时隙m上的资源，并且UE2、UE3和UE4预约的资源在该时隙m上的频域资源分别对应子信道0、子信道1和子信道2，另外可以看出UE4预约的资源每隔3个时隙出现一次。在该示例中，将UE2、UE3和UE4在资源选择窗内预约的资源分别称为资源#2、资源#3和资源#4，对应的CPE长度分别为CPE#2、CPE#3和CPE#4。应理解，CPE#2、CPE#3和CPE#4分别在m-1时隙上的最后的gap符号上传输。例如，该时隙m上的RB set为20MHz，则每个子信道为5MHz。该时隙m上各个资源的传输的优先级从高到低依次是UE#2、UE#4和UE#3，对应的CPE长度从长到短依次为CPE#2、CPE#4和CPE#3。
针对上述多个UE预约同一时隙m上的资源，为了避免造成UE之间的传输阻塞，UE1可以通过比较不同CPE长度进行资源重选。
示例性的，如果CPE#1小于CPE#2，则UE1进行资源重选，可以不选择该时隙m上的资源进行第一传输；或者，UE1可以将CPE#1增加至CPE#2，使得UE1和UE2可以同时在该时隙m上进行传输，避免UE1和UE2的传输被其他UE的传输阻塞，但是会阻塞UE3和UE4的传输；或者，UE1可以将CPE#1增加至CPE#5，CPE#5大于CPE#2，此时UE1可以使用该时隙m进行第一传输，但是会阻塞UE2、UE3和UE4的传输。
示例性的，如果CPE#1大于CPE#2，则UE1可以继续占用该时隙m进行第一传输，但是会阻塞UE2、UE3和UE4的传输；或者，UE1可以将CPE#1缩短至CPE#2，使得UE1和UE2可以同时在该时隙m上进行传输，避免UE1和UE2被其他UE的传输阻塞。
示例性的，如果CPE#1等于CPE#4，由于资源#1和资源#4在子信道2上重合，且UE4的预约消息的RSRP大于第一阈值，则UE1进行资源重选。例如，UE1可以不选择该时隙m(或者该时隙m上的子信道2)上的资源进行第一传输。
需要说明的是，以上仅是为便于理解方案给出的示例，不应构成对本申请技术方案的任何限定。
图6是本申请实施例提供的通信方法600的流程示意图。如图6所示，该方法包括如下多个步骤。
S610，第一终端设备接收预约消息。
其中，预约消息指示第二终端设备预约的第二资源。
可选地，第一终端设备接收预约消息，可以是第一终端设备从第二终端设备接收预约消息，或者也可以是第一终端设备从网络设备接收预约消息，即该预约消息由网络设备转发给第一终端设备，本申请对第一终端设备获取预约消息的方式不作限定。
需要说明的是，本申请对预约消息的数量，以及发送预约消息的终端设备的数量不作具体限定。即预约消息可以是一个或多个。当预约消息有多个时，该多个预约消息可以是同一个终端设备发送的，用于指示该终端设备预约的多个资源；或者，该多个预约消息也可以是不同终端设备发送的，用于指 示每个终端设备所预约的资源等。
S620，第一终端设备根据预约消息确定第二CPE长度。
其中，第二CPE长度与第二资源对应；
可选地，第一终端设备根据预约消息确定第二CPE长度，可以是第一终端设备根据第二资源对应的传输的优先级(例如，priority或CAPC)确定第二CPE长度；或者，也可以是第一终端设备根据预约消息所占用的CPE长度确定第二CPE长度。需要说明的是，这里传输的优先级包括但不限于：priority或CAPC。
应理解，第二CPE长度与第二资源对应，可以是第二CPE长度在前一时隙的gap符号上传输，当前时隙则用于第二资源的传输。另外，不同传输的优先级对应不同的CPE长度。例如，第一终端设备的第一传输对应第一CPE长度，第二终端设备的第二传输对应第二CPE长度。
还应理解，在物理层协议中，候选资源集合可以理解为第一终端设备从资源池中选择的用于第一传输的候选资源，该候选资源集合需要上报给MAC层，进一步在MAC层进行资源选择。也就是说，通过MAC层的资源选择后，候选资源集合中的部分或全部资源可以用于第一终端设备进行第一传输。
需要说明的是，该实现方式的步骤S610和S620的具体实现方式可分别参考上述方法400的步骤S410和S420，为了简洁，此处不再赘述。
S630，第一终端设备根据第一CPE长度和第二CPE长度，确定候选资源集合。
其中，候选资源集合的部分或全部资源用于第一终端设备进行第一传输，第一CPE长度是根据第一终端设备的第一传输的优先级确定的。
下面针对不同的应用场景，比较预约资源对应的不同CPE长度，并且结合图7至图9，详细说明第一终端设备确定候选资源集合的具体实现方式。
在一种可能的实现方式中，在第一CPE长度小于第二CPE长度的情况下，第一终端设备排除第三资源，得到候选资源集合，第三资源为第二资源所在时间单元上的频域资源。
应理解，第三资源为第二资源所在时间单元上的频域资源，包括：第三资源是第二资源所在时间单元上的部分或全部频域资源。例如，第三资源可以是该时间单元上的RB set内的资源，例如子信道0和子信道1对应的频域资源；或者，第三资源也可以是该时间单元上的一定频域范围内的资源。其中，该RB set的带宽可以是20MHz、某个预设值，或某个配置值。
也就是说，第一终端设备可以优先选择以下资源中的一项或者多项作为候选资源集合：附近子信道(例如，子信道2和子信道3)上无预约的频域资源，或者CPE长度小于第一CPE长度对应的预约资源#1，或者CPE长度等于第二CPE长度对应的预约资源#2，此时该预约资源#2对应的预约消息的RSRP值低于第一阈值。
需要说明的是，上述第一终端设备排除第三资源得到候选资源集合，以及将上述优选的资源纳入候选资源集合，可以是独立使用，即第一终端设备只执行排除资源的动作或执行纳入资源的动作，或者，也可以是组合使用，即第一终端设备同时将不符合条件的第三资源排除，且将符合传输条件的资源作为候选资源，本申请对此不作具体限定。
可选地，该第二CPE长度可以是UE1感知到的，同一时隙m上的所有预约资源对应的CPE长度最长的；或者，该第二CPE长度也可以不是该时隙m上最长的CPE长度，本申请对此不作具体限定。
示例性的，UE1通过接收UE2的预约消息，感知到UE2预约的第二资源位于时隙m上，该第二资源对应的第二CPE长度大于第一CPE长度，如果UE1在该时隙m上传输，则UE1的传输会受到UE2的inter-UE blocking的影响，造成对UE1的传输阻塞。因此，UE1可以将该时隙m上的部分或全部频域资源排除，得到候选资源。例如，以UE2预约的第二资源所在时隙m上的RB set为20MHz为例，第二资源的频域资源位于该时隙m上的子信道0和子信道3(即，第三资源)，则UE1可以将该时隙m上的所有时频资源排除，即候选资源集合完全不包括该第二资源所在的时隙m；或者，UE1也可以将该时隙m上的子信道0和子信道3对应的频域资源排除，即候选资源集合包括该时隙m上的其他subchannel的频域资源，例如子信道1和/或子信道2的频域资源。
图7是本申请实施例提供的资源选择的示意图。如图7所示，时隙n之前为感知窗，时隙n之后为资源选择窗，UE1通过感知、监听、或接收其他UE(例如UE2、UE3和UE4)的预约消息，确定UE2和UE3在资源选择窗内存在预约资源，其中UE2预约的资源位于时隙n+5上的子信道1，UE3预 约的资源位于时隙n+3、时隙n+9上的子信道2。例如，每个时隙上的RB set为20MHz，则每个时隙上的每个子信道为5MHz。将UE2和UE3在资源选择窗内预约的资源分别称为资源#2和资源#3，对应的CPE长度分别为CPE#2和CPE#3。应理解，CPE#2和CPE#3分别在时隙n+4和时隙n+2上的最后的gap符号上传输。
示例性的，为了避免UE1的传输受到其他UE的传输阻塞，该实现方式中UE1不选择大于第一CPE长度(可称为CPE#1)的CPE长度对应的资源。例如，若CPE#3大于CPE#1，则时隙n+3和时隙n+9上的资源不可选，即候选资源集合不包括时隙n+3和时隙n+9。可选地，UE1可以将CPE#1增大至CPE#3(甚至大于CPE#3)，则此时时隙n+3和时隙n+9上的资源可选。若CPE#2小于CPE#1，则时隙n+5上的资源可选，即候选资源集合包括时隙n+5。其中，UE#1可以按照CPE#1在时隙n+5上进行第一传输，此时UE#1的传输将导致UE#2的传输阻塞；或者，UE#1也可以按照CPE#2在时隙n+5上进行第一传输，此时UE#1和UE#2的传输互相不会阻塞，能够保证终端设备的传输效率，提升频谱利用率，降低传输时延。
在另一种可能的实现方式中，在第一CPE长度大于第二CPE长度的情况下，第一终端设备将第四资源作为候选资源集合；其中，第四资源包括：第一时间单元上的资源，第一时间单元与第二资源所在的时间单元不重叠；和/或，第二资源所在时间单元上的部分或全部资源。
应理解，第二CPE长度可以是UE1感知到的，同一时隙m上的所有预约资源对应的CPE长度中最长的。
示例性的，UE1通过接收UE2的预约消息，感知到UE2预约的第二资源位于时隙m上，在第一CPE长度大于第二CPE长度的情况下，若UE1根据第一CPE长度进行第一传输，那么第二CPE长度对应的第二资源所在时隙m上的全部资源均可以作为候选资源，即UE1可以选择或预约该时隙m上的全部子信道进行第一传输；或者，若UE1根据第二CPE长度进行第一传输，那么需要进一步考虑(可以确定第二CPE长度的)预约消息#2的RSRP与第一阈值的大小，如果该预约消息的RSRP低于第一阈值，则该第二CPE长度对应的第二资源所在的时隙m可以作为候选资源。
示例性的，在第一CPE长度大于第二CPE长度的情况下，若UE1根据第二CPE长度进行第一传输，且该预约消息#2的RSRP高于第一阈值，该UE1可以将第二资源所在的时隙m从候选资源池中排除。
应理解，上述第一终端设备排除资源或纳入资源的方式，可以独立使用，也可以组合使用，本申请对此不作具体限定。
可选地，UE1还可以根据感知消息确定第四CPE长度，第四CPE长度对应第四资源，第四资源与第二资源所在时域资源相同(即，位于同一时隙m)。假设UE1通过感知预约消息，确定第四CPE长度是该时隙m上的最长的CPE长度(即，第四CPE长度大于第二CPE长度)，例如，在第一CPE长度大于第四CPE长度的情况下，若UE1根据第一CPE长度进行第一传输，那么第四CPE长度对应的第四资源所在时隙m上的全部资源可以作为候选资源，即UE1可以选择或预约该时隙m上的全部子信道进行第一传输；或者，若UE1根据第四CPE长度进行第一传输，那么需要进一步考虑(可以确定第四CPE长度的)预约消息#4的RSRP与第一阈值的大小，如果该预约消息的RSRP低于第一阈值，则该第四CPE长度对应的第四资源所在的时隙m可以作为候选资源。又例如，在第一CPE长度大于第四CPE长度的情况下，若UE1根据第四CPE长度进行第一传输，且该预约消息#4的RSRP高于第一阈值，则UE1可以将第四资源所在的时隙m从候选资源池中排除。
应理解，上述第一终端设备排除资源或纳入资源的方式，可以独立使用，也可以组合使用，本申请对此不作具体限定。
图8是本申请实施例提供的资源选择的示意图。如图8所示，时隙n之前为感知窗，时隙n之后为资源选择窗，UE1通过感知、监听、或接收其他UE(例如UE2、UE3、UE4和UE5)的预约消息，确定UE2预约的资源位于时隙n+4、n+5、n+8和n+9上的子信道0，UE3预约的资源位于时隙n+5和n+6上的子信道1，UE4预约的资源位于时隙n+3和时隙n+9上的子信道2，UE5预约的资源位于时隙n+4和n+7上的子信道2。例如，每个时隙上的RB set为20MHz，则每个时隙上的每个子信道为5MHz。将UE2、UE3、UE4和UE5在资源选择窗内预约的资源分别称为资源#2、资源#3、资源#4和资源#5，对应的CPE长度分别为CPE#2、CPE#3、CPE#4和CPE#5。应理解，CPE#2、CPE#3、CPE#4和CPE#5 分别对应的资源所在时隙上的前一时隙的最后的gap符号上传输。
示例性的，CPE#2、CPE#4与UE1的CPE#1相等，CPE#2大于CPE#3、CPE#5。则UE1通过感知每个时隙上的所有预约消息，确定时隙n+2上的资源无任何预约，即时隙n+2为未被预约的时隙；时隙n+3上的资源#4对应的CPE#4最长，时隙n+4上的资源#2对应的CPE#2最长，时隙n+5上的资源#2对应的CPE#2最长，时隙n+6上的资源#3对应的CPE#3最长，时隙n+7上的资源#5对应的CPE#5最长，时隙n+8上的资源#2对应的CPE#2最长，时隙n+9上的资源#2对应的CPE#2，以及资源#4对应的CPE#4相等。
为了避免不同终端设备之间相互的阻塞，保证终端设备的传输效率，该实现方式中UE1需要从CPE长度相同的时隙上，或者空闲时隙上选择资源，由于时隙n+6、时隙n+7上的预约资源#3、资源#5对应的CPE#3、CPE#5均与CPE#1不相等，因此UE1需要排除时隙n+6和时隙n+7上的资源，其他时隙n+2、时隙n+3、时隙n+4、时隙n+5、时隙n+8和时隙n+9上的资源均可以作为UE1进行第一传输的候选资源，上报至MAC层。可选地，UE1将CPE#1调整(减小)至CPE#3，此时若UE1按照CPE#3进行传输时，可以将时隙n+2和时隙n+6作为候选资源；或者，UE1将CPE#1调整(减小)至CPE#5，此时若UE1按照CPE#5进行传输时，可以将时隙n+2和时隙n+7作为候选资源。
在又一种可能的实现方式中，在第一CPE长度等于第二CPE长度，且预约消息的参考信号的接收功率RSRP高于第一阈值的情况下，第一终端设备排除与第二资源至少部分重合的资源，得到候选资源集合。
需要额外说明的是，针对第二CPE长度对应的第二资源，UE1将排除第二资源中与第一资源有部分或全部时频资源重合，且预约消息的RSRP大于第一阈值的资源。
换句话说，在第一CPE长度等于第二CPE长度，且预约消息的RSRP高于第一阈值的情况下，第一终端设备可以将第四资源作为候选资源集合；其中，第四资源包括：第一时间单元上的资源，第一时间单元与第二资源所在的时间单元不重叠，即未被预约的时间单元上的资源；和/或，第二资源所在时间单元上的部分或全部资源。
应理解，该第二CPE长度可以是UE1感知到的，同一时隙m上的所有预约资源对应的CPE长度最长的。
示例性的，UE1通过接收UE2的预约消息，感知到UE2预约的第二资源位于时隙m上，在第一CPE长度等于第二CPE长度的情况下，可以按照现有R16/R17流程，根据预约消息的RSRP与第一阈值的大小进行资源选择。例如，若UE1确定第二CPE长度的预约消息的RSRP高于第一阈值，则UE1排除该第二CPE长度对应的第二资源所在的时隙m上的资源。
示例性的，UE1通过接收UE2的预约消息，感知到UE2预约的第二资源位于时隙m上，在第一CPE长度等于第二CPE长度的情况下，若UE1确定第二CPE长度的预约消息的RSRP低于第一阈值，则UE1可以该第二CPE长度对应的第二资源所在的时隙m上的资源作为候选资源。
应理解，以上第一终端设备排除资源或纳入资源的方式，可以独立使用，也可以组合使用，本申请对此不作具体限定。
需要说明的是，在有多个预约消息预约的资源均在时隙m上时，UE1需要遍历该时隙m上的所有预约消息，并最终确定候选资源，可能会出现将时隙m上部分资源重复作为候选资源上报至MAC的情况。例如，存在3个预约消息同时预约了时隙m上的资源，在UE1在感知预约消息#1后，确定资源#1为：时隙m上的子信道0和子信道2；进一步的，UE1在感知预约消息#2后，确定资源#2为：时隙m上的全部资源(包括子信道0～子信道3)；最后，UE1在感知预约消息#3后，确定资源#3为：时隙m上的子信道0、子信道1和子信道3。综合该时隙m上的所有预约消息的感知结果，UE1可以将资源#1、资源#2和资源#3共有的资源作为候选资源上报至MAC层。例如，时隙m上的子信道0对应的资源。
需要额外指出的是，在时隙m上，UE1感知到的所有预约资源中可能还有第五资源，该第五资源对应的第五CPE长度小于第二CPE长度(该时隙m上预约资源对应的最长CPE长度)，即第五资源小于第一CPE长度。针对这一情况，UE1可以在第一CPE长度与第二CPE长度相等的情况下，考虑与第二CPE长度对应的预约消息的RSRP与第一阈值的大小，进而确定候选资源。相比之下，UE1无需比较第五CPE长度对应的预约消息的RSRP与第一阈值之间的大小，可以将第五资源作为候选资源。 也就是说，该实现方式中只有感知到同一时隙上CPE长度与第一CPE长度相同的预约消息，才需要比较该预约消息的RSRP与第一阈值的关系，并且在该预约消息的RSRP高于第一阈值的情况下，排除该第二资源。
可选地，在第一CPE长度等于第二CPE长度，且预约消息的参考信号的接收功率RSRP高于第一阈值的情况下，考虑到带内泄漏(Inter-band emission，IBE)问题，UE1可以优先选择以下资源中的一项或者多项作为候选资源集合：假设UE2预约了时隙m上的子信道1和子信道0对应的频域资源，UE1可以选择该时隙m上的附近子信道上无预约的频域资源(例如，子信道3)；或者，UE1选择CPE长度小于第一CPE长度对应的预约资源；或者，UE1选择CPE长度等于第二CPE长度对应的预约资源#2，此时该预约资源#2对应的预约消息的RSRP值低于第一阈值。
图9是本申请实施例提供的资源选择的示意图。如图9所示，时隙n之前为感知窗，时隙n之后为资源选择窗，UE1通过感知、监听、或接收其他UE(例如UE2、UE3、UE4和UE5)的预约消息，确定UE2预约的资源位于时隙n+4、n+5、n+8和n+9上的子信道0，UE3预约的资源位于时隙n+5和n+6上的子信道1，UE4预约的资源位于时隙n+3和时隙n+9上的子信道2，UE5预约的资源位于时隙n+4和n+7上的子信道2。例如，每个时隙上的RB set为20MHz，则每个时隙上的每个子信道为5MHz。将UE2、UE3、UE4和UE5在资源选择窗内预约的资源分别称为资源#2、资源#3、资源#4和资源#5，对应的CPE长度分别为CPE#2、CPE#3、CPE#4和CPE#5。应理解，CPE#2、CPE#3、CPE#4和CPE#5分别对应的资源所在时隙上的前一时隙的最后的gap符号上传输。
示例性的，假设CPE#2大于CPE#4，CPE#4大于UE1的CPE#1，CPE#3小于CPE#1，CPE#5等于CPE#1，则UE1通过感知每个时隙上的所有预约消息，确定时隙n+2上的资源无任何预约，即时隙n+2为未被预约的时隙；时隙n+3上的资源#4对应的CPE#4最长，时隙n+4上的资源#2对应的CPE#2最长，时隙n+5上的资源#2对应的CPE#2最长，时隙n+6上的资源#3对应的CPE#3最长，时隙n+7上的资源#5对应的CPE#5最长，时隙n+8上的资源#2对应的CPE#2最长，时隙n+9上的资源#2对应的CPE#2最长。
为了避免UE1的传输对其他UE造成传输阻塞，该实现方式中UE1需要从CPE长度短的时隙上，或者空闲时隙上选择资源。由于CPE#4大于CPE#1，则时隙n+3和时隙n+9上的资源不可选；类似地，CPE#2大于CPE#1，则时隙n+4、时隙n+5、时隙n+8和时隙n+9上的源不可选。由于CPE#3小于CPE#1，则可以时隙n+6上的资源可选；考虑到CPE#5于CPE#1，且UE5的预约消息的RSRP大于第一阈值，所以时隙n+7上的资源不可选。另外，时隙n+2作为空闲时隙，该时隙n+2上的资源也可选。因此，UE1需要排除时隙n+3、时隙n+4、时隙n+5、时隙n+7、时隙n+8和时隙n+9上的资源，其他时隙n+2、和时隙n+6上的资源可以作为UE1进行第一传输的候选资源，上报至MAC层。
需要说明的是，UE1可以在时隙上n+6按照CPE#1进行传输，保证UE1的传输效率，但是会造成对UE3的传输阻塞；或者，UE1也可以在时隙上n+6按照CPE#3进行传输，保证UE1和UE3的传输效率，互相不会造成传输阻塞。类似地，UE1可以在时隙上n+7按照CPE#1进行传输，保证UE1的传输效率，但是会造成对UE5的传输阻塞。
在又一种可能的实现方式中，该方法还包括：在候选资源集合无法满足第一终端设备的第一传输的需求的情况下，第一终端设备增加第一CPE长度。进一步地，第一终端设备根据增加后的第一CPE长度和第二CPE长度，确定候选资源集合。
其中，候选资源集合无法满足第一终端设备的第一传输的需求，包括以下一项或多项：
1、候选资源集合中的候选资源所在的时间单元数量低于阈值#1；或者，
2、候选资源集合中的候选资源数量低于阈值#2；阈值#2是资源池内资源数量乘以某一百分比得到的；或者，
3、候选资源集合中的候选资源所在的时间单元数量小于阈值#3，且候选资源集合内的候选资源数量小于阈值#4；或者，
4、不满足“候选资源集合中的候选资源所在的时间单元数量大于或等于阈值#5，且平均每个时间单元上的候选资源数量大于或等于阈值#6”；或者，
5、不满足“候选资源集合中的候选资源所在的时间单元数量大于或等于阈值#7，且每个时间单元上的候选资源数量大于或等于阈值#8”。
需要说明的是，上述阈值(例如，阈值#1至阈值#8等)可以是固定值，也可以是资源池内的时间单元数量乘以一个比值，本申请对此不作具体限定。
示例性的，UE1的第一传输需要x个资源，而UE1通过感知预约消息，基于CPE长度最终确定的候选资源集合中包括y个资源，y小于x，则候选资源集合必然是无法满足第一终端设备的第一传输的需求，此时UE1可以通过增加第一CPE长度，增加选择候选资源集合的几率，进而获得更多的用于第一传输的候选资源。
示例性的，UE1的第一传输需要x个资源，而UE1通过感知预约消息，基于CPE长度最终确定的候选资源集合中包括y个资源，y小于上报MAC层的候选资源的数量阈值z，这里并不限定x与y值之间的大小关系。应理解，该数量阈值z可以是协议规定的，此时UE1可以通过增加第一CPE长度，增加选择候选资源集合的几率，进而获得更多的用于第一传输的候选资源。
需要说明的是，UE1通过增加第一CPE长度，可以提升信道接入的机会，使用增加后的第一CPE长度能够尽可能地从候选资源池中筛选出更多的用于第一传输的候选资源。但是在实际传输过程中，UE1可以采用该时隙m上最长的CPE长度对应的资源进行第一传输，减少对其他UE造成inter-UE blocking的影响；或者，UE1也可以使用增加后的第一CPE长度对应的资源进行第一传输，保证UE1的传输效率；或者，针对预留空检查(pre-emption checking)的场景，UE1可以根据checking的结果确定候选资源集合，具体实现方式可以参考上述方法400的步骤S430的具体实现方式，为了简洁，此处不再赘述。
示例性的，针对某一时隙m，如果UE1增加后的第一CPE长度大于该时隙m上传输的最高优先级对应的CPE长度(例如，CPE#2)，则该时隙m上的资源可以作为UE1进行第一传输的候选资源，上报至MAC层。在实际传输中，UE1可以在该时隙m上按照第一CPE长度进行传输，能够保证UE1的传输效率，但是会造成对UE2的传输阻塞；或者，UE1也可以在该时隙m上按照第二CPE长度进行传输，能够同时保证UE1和UE2的传输效率，避免造成对传输阻塞。
在又一种可能的实现方式中，该方法还包括：第一终端设备根据预约消息确定第三CPE长度，第三CPE长度与第三资源对应，第三CPE长度小于第二CPE长度。
基于上述示出的实现方式，第一终端设备根据不同CPE长度的比较结果，能够确定用于进行第一传输的候选资源集合。应理解，第一终端设备在物理层确定候选资源集合之后，需要将候选资源集合上报至MAC层，供MAC层进行资源选择，即从候选资源集合中选择部分或全部资源用于进行第一传输。
接下来，对第一终端设备上报至MAC层的候选资源集合进行具体说明。
在一种可能的实现方式中，候选资源集合包括第一候选资源子集，和/或第二候选资源子集，第一候选资源子集中的资源对应的第二CPE长度等于第一CPE长度，第二候选资源子集中的资源对应的第二CPE长度小于第一CPE长度。
示例性的，候选资源池包括时隙1至时隙3，UE1通过感知所有的预约消息，确定UE2预约的资源为时隙1和时隙3，UE3预约的资源为时隙1和时隙2，UE4预约的资源为时隙2和时隙3。例如，时隙1上UE2的传输的最高优先级对应的CPE#2长度最大(例如，CPE#2大于CPE#3)，且CPE#2等于第一CPE长度，则第一侯选资源子集包括时隙1上的资源；时隙2上UE3的传输的最高优先级对应的CPE#3长度最大，且CPE#3小于第一CPE长度，则第二侯选资源子集包括时隙2上的资源；时隙3上UE4的传输的最高优先级对应的CPE#4长度最大(例如，CPE#4大于CPE#2)，且CPE#4大于第一CPE长度，则UE1可以将时隙3上的资源从候选资源池中排除。因此，UE1上报MAC层的第一候选资源子集包括时隙1上的资源，和/或UE1最终上报MAC层的第二候选资源子集包括时隙2上的资源。
在另一种可能的实现方式中，候选资源集合包括第三候选资源子集，第三候选资源子集中的资源对应的第二CPE长度等于第一CPE长度，以及第三候选资源子集中的资源为第一时间单元上的资源，第一时间单元与第二资源所在的时间单元不重叠。。
示例性的，候选资源池包括时隙1至时隙5，UE1通过感知所有的预约消息，确定UE2预约的资源为时隙1和时隙3，UE3预约的资源为时隙1和时隙2，UE4预约的资源为时隙2和时隙3。例如，时隙1上UE2的传输的最高优先级对应的CPE#2长度最大(例如，CPE#2大于CPE#3)，且CPE#2 等于第一CPE长度，则第三侯选资源子集包括时隙1上的资源；时隙2上UE3的传输的最高优先级对应的CPE#3长度最大，且CPE#3小于第一CPE长度，则第三侯选资源子集不包括时隙2上的资源；时隙3上UE4的传输的最高优先级对应的CPE#4长度最大(例如，CPE#4大于CPE#2)，则第三候选资源子集包括时隙1上的资源，以及未被预约的时隙(例如，时隙4和/或时隙5)上的资源。
根据本申请提供的方案，通过比较不同终端设备的CPE长度，确定候选资源集合。基于CPE长度进行资源选择，有针对性地避免第一终端设备的传输被其他终端设备的传输阻塞(或者，避免第一终端设备的传输阻塞其他终端设备的传输)，提高终端设备的传输效率，避免频谱资源的不必要浪费，保障系统传输性能。
在Mode 2场景中，终端设备会自发地进行资源感知和资源选择(或者说资源预约)，来确定SL传输所占用的时频资源。例如，UE在接入信道之前，可以通过发送CPE来抢占信道，具体抢占的时间长度可以与传输优先级(例如CAPC或priority的值)有关，可以根据标准规定，也可以由UE内部实现，不同传输的优先级对应不同的CPE长度，通常传输的优先级越高，对应的CPE长度越长。
应理解，CPE长度是时域资源，CPE传输则是在对应的CPE长度上进行的。通常可以将CPE传输的时间长度定义为CPE长度，CPE长度则是指从该CPE起始点(也可以称为CPE起始位置)开始，到终端设备开始进行SL传输之前的时间间隔，或者说，从该CPE起始点到下一个AGC符号之前的时间间隔。也就是说，CPE起始点和CPE长度是一一对应的关系，CPE起始点越早，对应的CPE长度越长。而且，CPE的起始点和传输的优先级有关，不同传输的优先级对应不同的CPE起始点，通常优先级越高或CAPC值越小，CPE的起始点越早。在本申请实施例中，在无特别说明的情况下，CPE起始点和CPE长度这二者不作特别区分，可替换使用。
示例性的，在时域资源上，CPE起始点的确定可以是以下任意一项，为便于理解和描述，本申请实施例将方式(1)中的CPE起始点称为第一预设CPE起始点，该CPE起始点将方式(2)和(3)的组合作为预设CPE起始点集合，该集合中的CPE起始点称为第二预设CPE起始点，下文相关部分不重复赘述。
方式(1)：CPE起始点位于下一个AGC符号之前的一个符号内，例如第一CPE起始点在前一时隙的最后一个符号上，当前时隙则用于SL传输；
方式(2)：当子载波间隔(sub-carrier space，SCS)为15kHz时，CPE起始点位于下一个AGC符号之前的一个符号内，例如第一CPE起始点在前一时隙的最后一个符号上，当前时隙则用于SL传输；
方式(3)：当SCS为30kHz或60kHz时，CPE起始点位于下一个AGC符号之前的至多2个符号内，例如第一CPE起始点在前一时隙的最后一个或两个符号上，当前时隙则用于SL传输。
其中，上述方式(3)中，第一CPE起始点在前一时隙的最后一个或两个符号上，可以是最后2个符号上任意一个符号上，例如CPE起始点位于倒数第2个符号上，或例如CPE起始点位于最后1个符号上；而且，以位于最后1个符号上为例，CPE起始点可以位于该最后1个符号上的任意位置，该位置例如是符号开始之后16us或25us，该位置是协议规定的或UE出厂预配置的。
可选的，上述第一预设CPE起始点位于下一个AGC前的一个符号内，该第一预设CPE起始点是预配置的，例如可以是default的值。预设CPE起始点集合位于下一个AGC前的一个或二个符号内，包括预配置的至少2个值。预设CPE起始点集合是预配置的，或者是根据优先级(例如CAPC或priority)等其他因素确定的值，本申请对此不作限定。
针对上述方式(1)-(3)中的CPE起始点的使用条件和场景，假设当UE占用一个RB set内的部分频域资源(即partial RB set)时，考虑到该RB set内的其他频域资源可以让其他UE使用，因此可以采用固定的CPE起始点(或固定的CPE长度)，例如上述方式(1)，使得这些UE的CPE起始点相同，对应的CPE长度也相同，即不会出现某一个或多个UE的CPE起始点早于其他UE的CPE起始点，避免造成其他UE进行LBT时无法通过的问题，即block其他UE；当UE占用一个RB set内的全部频域资源(即full RB set)时，可以采用预设CPE起始点集合中的一个CPE起始点，例如上述方式(2)或(3)中的第二预设CPE起始点。
然而，SL传输并不限制资源选择的具体位置，也就是说，占用full RB set的UE可能与占用partial RB set的UE所使用的频域资源重合，在这种情况下，如果占用partial RB set的UE的CPE起始点采 用上述方式(1)，而占用full RB set的UE的CPE起始点采用上述方式(3)，则两者的CPE长度就会出现不相等的场景，此时，意味着占用full RB set的UE和占用partial RB set的UE中，CPE起始点较早的UE将block CPE起始点较晚的UE，或者说，CPE长度较长的UE将block CPE长度较短的UE。因此，也就可能会出现低优先级的UE block高优先级的UE的情况，例如高优先级(或较高优先级)的UE(占用full RB set)的CPE起始点比低优先级(或较低优先级)的UE(占用partial RB set)的UE的CPE起始点晚；或者，高优先级(或较高优先级)的UE(占用partial RB set)的CPE起始点比低优先级(或较低优先级)的UE(占用full RB set)的UE的CPE起始点晚。
图10是本申请实施例提供的不同终端设备进行资源选择的示意图。以不同终端设备预约或选择的资源在频域上包含一个或多个RB set的全部或部分资源，在时域上包含一个时隙为例进行说明。如图10的(a)所示，在同一个时隙上，UE-1选择的资源#1占用一个RB set内的全部资源，UE-x预约的资源#2占用该RB set内的部分资源，即资源#1和资源#2在同一时隙上的频域资源存在部分重合，假设UE-1选择的资源#1对应的CPE起始点采用上述方式(2)确定，UE-x所预约的资源#2对应的CPE#2起始点采用上述方式(1)确定，则UE-1和UE-x采用的CPE起始点可能不同，若UE-x的CPE起始点早于UE-1的CPE起始点，且UE-x的传输优先级低于UE-1的传输优先级，则UE-x的传输将会block UE-1的传输，使得高优先级的UE-1LBT失败，无法传输。如图10的(b)所示，在同一个时隙上，UE-1选择的资源#1占用4个RB set内的全部资源，分别是RB set#0、RB set#1、RB set#2和RB set#3，UE-x预约的资源#2占用部分RB set(例如，部分RB set#0和部分RB set#1)，即资源#1和资源#2存在部分重合，假设UE-1选择的资源#1对应的CPE起始点采用上述方式(3)确定，UE-x所预约的资源#2对应的CPE#2起始点采用上述方式(1)确定，则UE-1和UE-x采用的CPE起始点可能不同，若UE-1的CPE起始点晚于UE-x的CPE起始点，且UE-1的传输优先级高于UE-x的传输优先级，则UE-1的传输将会被UE-x的传输block，即低优先级的UE-x的传输block高优先级的UE-1的传输，使得UE-1的传输性能下降。
可选地，如图10的(c)所示，在同一个时隙上，UE-1选择的资源#1占用4个RB set内的全部资源，分别是RB set#0、RB set#1、RB set#2和RB set#3，UE-x预约的资源#2占用一个RB set(如RB set#1)内的全部资源，即资源#1和资源#2存在部分重合。在该场景下，UE-1和UE-x可以根据传输优先级，确定资源#1和资源#2分别对应的CPE起始点-1和CPE起始点-x。通常来说，优先级越高，对应的CPE起始点越早，CPE长度越长。例如，若UE-1的传输优先级高于UE-x的传输优先级，则UE-1可以在该资源#1上进行传输；若UE-1的传输优先级低于UE-x的传输优先级，则UE-x可以在该资源#2上进行传输；若UE-1的传输优先级等于UE-x的传输优先级，则UE-1和UE-x的传输都可以正常进行。可选地，该场景下的UE-1也可以采用本申请实施例中提供的技术方案确定CPE起始点-1，具体实现方式可参考下文相关描述。
针对上述问题，本申请提供了一种通信方法和装置，针对其他终端设备与第一终端设备预约同一时域资源上的至少部分频域资源重合的情况，第一终端设备根据感知到的预约消息，确定不同预约资源对应的CPE起始点和传输优先级，并结合第一终端设备的传输优先级，能够确定第一终端设备的CPE起始，尽可能地避免不同终端设备选择的资源发生碰撞，特别是保证高优先级的传输不被低优先级的传输阻塞，提高频谱的利用率，以及保证用户的业务传输和体验。
图11是本申请实施例提供的通信方法1100的流程示意图。如图11所示，该方法包括如下多个步骤。
S1110，第一终端设备接收第一预约消息。
其中，第一预约消息指示第二终端设备预约的第二资源。
示例性的，第一终端设备从第二终端设备接收第一预约消息，或者第一终端设备从网络设备接收第一预约消息，即该第一预约消息由网络设备转发给第一终端设备，网络设备可以从第二终端设备或其他设备接收该第一预约消息，即本申请对第一终端设备获取第一预约消息的方式不作限定。具体地，第一终端设备感知、监听、或接收第一预约消息。该第一预约消息可以显示或隐式地指示第二终端设备预约的第二资源。其中，第二资源包括但不限于：预留间隔信息、频域资源信息、时域资源信息、优先级信息，每个参数的具体含义可参考上述方法400的步骤S410的相关描述，为了简洁，此处不作赘述。
需要说明的是，本申请对第一终端设备感知、监听、或接收预约消息的数量，以及向第一终端设备发送预约消息的其他终端设备的数量不作具体限定。即预约消息可以是一个或多个。当预约消息有多个时，该多个预约消息可以是同一个终端设备发送的，用于指示该终端设备预约的多个资源；或者，该多个预约消息也可以是不同终端设备发送的，用于指示每个终端设备所预约的资源等，例如第一终端设备还可以接收来自第二终端设备的第二预约消息，或者，第一终端设备还可以接收来自第三终端设备的第二预约消息。
需要说明的是，在本申请实施例中，如果第二终端设备的预约消息指示第二终端设备预约了多个连续的时隙，则第二资源位于该多个连续时隙的首个时隙；如果该预约消息指示第二终端设备预约了一个时隙，则第二资源的时域资源即为该时隙上，应理解，该示例性的说明同样适用于其他实施例中的预约消息预约的资源。
S1120，第一终端设备根据第一预约消息确定第二CPE起始点和第二资源对应的第二传输的优先级。
其中，第二CPE起始点与第二资源对应。例如，当第二资源的频域资源占用full RB set，则第二CPE起始点是根据第二传输的优先级确定的，例如可以采用上述方式(2)或(3)确定，例如第二CPE起始点可以是位于前一时间单元(例如时隙)上的一个符号内，如GP符号，或者位于前一时间单元上的最后一个或两个符号内，当前时间单元则用于第二资源的传输；当第二资源的频域资源占用partial RB set，则第二CPE起始点可以采用上述方式(1)确定，例如第二CPE起始点可以是位于在前一时间单元上的一个符号内，当前时间单元则用于第二资源的传输。
示例性的，第一终端设备根据第一预约消息确定第二CPE起始点，可以是第一终端设备根据第二传输的优先级确定第二CPE起始点；或者，也可以是第一终端设备根据第一预约消息的CPE起始点确定第二CPE起始点。
S1130，第一终端设备根据第二传输的优先级、第二CPE起始点和第一传输的优先级，确定第一CPE起始点或第三资源。
其中，第一资源是第一终端设备为第一传输选择的资源，第一资源与第二资源在同一时间单元(例如时隙)上的至少部分频域资源(例如RB set)重合。应理解，第一CPE起始点与第一资源对应，说明第一CPE起始点可以是位于前一时间单元(例如时隙)上的一个符号内，或者位于前一时间单元上的最后一个或两个内，当前时间单元则用于第一资源的传输。
在本申请实施例中，第一资源可以是占用full RB set的资源，也可以是占用partial RB set的资源，本申请对此不作具体限定。具体地，在第一终端设备执行步骤S1130之前，若第一资源占用第一时间单元(例如时隙#m)上的一个或多个资源块集合的全部频域资源(full RB set)，例如图10的(b)所示的UE-1占用的频域资源，则第一终端设备可以采用根据上述方式(2)或(3)确定对应的CPE起始点，此时该UE-1的CPE起始点是第二预设CPE起始点；若第一资源占用第一时间单元(例如时隙#m)上的一个或多个资源块集合的部分频域资源(partial RB set)，例如图10的(a)和图10的(c)所示的UE-X占用的频域资源，则第一终端设备可以采用根据上述方式(1)确定对应的CPE起始点，此时该UE-1的CPE起始点是第一预设CPE起始点。
需要说明的是，该实现方式的应用场景是指，第一终端设备为第一传输选择了第一资源，并且通过感知、监听、或接收其他终端设备的预约消息(例如，第二终端设备的第一预约消息)，确定其他终端设备预约的资源与第一终端设备选择的第一资源所在的同一时间单元上(例如，某一时隙)上有部分频域资源重合。
下面，针对第一终端设备和第二终端设备占用的频域资源，结合图12和图13，分别对第一终端设备根据第二传输的优先级、第二CPE起始点和第一传输的优先级，确定第一CPE起始点或第三资源的具体实现方式进行说明。
情况一：
针对第一终端设备选择了full RB set资源(即第一资源)，第二终端设备预约了partial RB set资源(即第二资源)的场景，对第一终端设备根据第二传输的优先级、第二CPE起始点和第一传输的优先级，确定第一CPE起始点的具体实现方式进行说明。
此时，第一资源占用第一时间单元(例如时隙#m)上的一个或多个资源块集合的全部频域资源， 第二资源占用第一时间单元上的一个或多个资源块集合的部分频域资源。其中，第二CPE起始点是采用上述方式(1)确定的第一预设CPE起始点。
在第一种实现方式中，在第一传输的优先级高于或等于第二传输的优先级的情况下，第一终端设备确定第一CPE起始点不晚于第二CPE起始点。换句话说，第一CPE起始点可以是等于第二CPE起始点，也可以是早于第二CPE起始点，这样才不会导致高优先级的第一传输被低优先级的第二传输block。
示例性的，如果在执行步骤S1130之前，第一终端设备为第一传输确定的CPE起始点(为便于描述，以下简称为CPE起始点#1，下文不重复赘述)早于或等于第二CPE起始点，则第一终端设备可以不作调整，此时CPE起始点#1即为第一CPE起始点，第一终端设备可以正常进行第一传输。若CPE起始点#1晚于第二CPE起始点，则第一传输可能会被第二传输block，因此第一终端设备可以将CPE起始点#1调整至与第二CPE起始点相同的位置，或者也可以将CPE起始点#1调整至第二CPE起始点之前，得到第一CPE起始点，这样第一传输可以正常进行。也就是说，第一终端设备确定的第一CPE起始点是CPE起始点#1和第二CPE起始点中较早的一个。即该实现方式能保证高优先级的第一传输不被低优先级的第二传输阻塞。
图12是本申请实施例提供的资源选择的示意图。如图12所示，以不同终端设备预约或选择的资源在频域上包含一个RB set(例如，以一个RB set包含4个子信道，例如子信道0、子信道1、子信道2和子信道3为例)的全部或部分资源，在时域上包含一个时隙为例进行说明。假设UE1为第一传输选择的资源#1位于时隙m上的一个full RB set，即资源#1占用时隙m上的子信道0、子信道1、子信道2和子信道3。例如，该时隙m上的RB set为20MHz，则每个子信道为5MHz。应理解，在UE1进行第一传输之前，UE1需要在m-T3时刻进行预留空和重评估检查，时隙n之前为感知窗，时隙n之后为资源选择窗，在时隙n之前，UE1通过感知、监听、或接收其他UE(例如UE2、UE3)的预约消息，确定UE2、UE3同时预约了资源选择窗内的时隙m上的资源，并且UE2、UE3预约的资源在该时隙m上的频域资源分别对应子信道0、子信道2，另外可以看出UE3预约的资源每隔3个时隙出现一次。也就是说，UE1分别与UE2、UE3在时隙m上的频域资源存在部分重合。在该示例中，将UE2、UE3在资源选择窗内预约的资源分别称为资源#2、资源#3，对应的CPE起始点分别为CPE起始点#2、CPE起始点#3。其中，CPE起始点#2、CPE起始点#3可以是预定义的，例如上述第一预设CPE起始点，分别位于m-1时隙上的最后的一个符号内。
为了避免UE1的传输被其他UE的传输阻塞，假设该时隙m上UE2的传输优先级高于UE3的传输优先级，如果UE1的传输优先级高于UE2和UE3的传输优先级，则UE1为第一传输所选择的资源#1的CPE起始点#1不能晚于CPE起始点#2、CPE起始点#3中最早的一个。示例性的，如果UE1确定CPE起始点#2最早，且CPE起始点#1早于或等于CPE起始点#2，则UE1可以不调整CPE起始点#1。如果CPE起始点#1晚于CPE起始点#2的起始点，则UE1可以将CPE起始点#1调整到与CPE起始点#2相同的位置，或者将CPE起始点#1调整到CPE起始点#2之前的位置，这样UE1的传输都可以正常进行。
在第二种实现方式中，在第一传输的优先级等于第二传输的优先级的情况下，第一终端设备确定第一CPE起始点等于第二CPE起始点。应理解，由于第一传输的优先级等于第二传输的优先级，且第二CPE起始点可以是预定义的，例如上述第一预设CPE起始点，则将第一CPE起始点设置为等于第二CPE起始点，可以避免相同优先级的第一传输和第二传输互相block。也就是说，第一终端设备确定的第一CPE起始点可以是上述第一预设CPE起始点。
示例性的，如果第二资源对应的CPE起始点#2早于第一资源对应的CPE起始点#1，则UE1的传输会被UE2的传输block，则UE1可以将CPE起始点#1调整到CPE起始点#2的位置，这样可以保证UE1和UE2的传输正常进行；或者UE1也可以将CPE起始点#1调整到CPE起始点#2之前，得到第一CPE起始点，这样可以保证UE1的传输正常进行。如果第二资源对应的CPE起始点#2晚于第一资源对应的CPE起始点#1，UE1可以不作调整，此时CPE起始点#1即为第一CPE起始点，这样UE1的传输正常进行；如果第二资源对应的CPE起始点#2等于第一资源对应的CPE起始点#1，则UE1可以不作调整，此时CPE起始点#1即为第一CPE起始点，这样UE1和UE2的传输都正常进行。
如图12所示，假设该时隙m上UE1、UE2和UE3的传输优先级相同，则UE1确定第一传输所选 择的资源#1的CPE起始点#1等于CPE起始点#2、CPE起始点#3，以保证UE1、UE2和UE3的传输不互相阻塞，提升频谱利用率。可选的，如果UE1确定CPE起始点#2早于CPE起始点#3，且CPE起始点#1早于或等于CPE起始点#2，则UE1可以不调整CPE起始点#1，以防止UE1的传输被UE2的传输阻塞。如果CPE起始点#1晚于CPE起始点#2的起始点，则UE1可以将CPE起始点#1调整到与CPE起始点#2相同的位置，以保证UE1和UE2的正常传输，或者将CPE起始点#1调整到CPE起始点#2之前的位置，这样UE1的传输可以正常进行。
在第三种实现方式中，在第一传输的优先级低于或等于第二传输的优先级的情况下，第一终端设备确定第一CPE起始点不早于第二CPE起始点。换句话说，第一CPE起始点可以是等于第二CPE起始点，也可以是晚于第二CPE起始点，这样才不会导致高优先级的传输被低优先级的传输block。
示例性的，如果CPE起始点#1晚于或等于第二CPE起始点，则第一终端设备可以不作调整，此时CPE起始点#1即为第一CPE起始点，这样可以保证第二传输正常进行。若CPE起始点#1早于第二CPE起始点，则第一终端设备可以将CPE起始点#1调整至与第二CPE起始点相同的位置，或者也可以将CPE起始点#1调整至第二CPE起始点之后，得到第一CPE起始点，这样可以保证第二传输正常进行。也就是说，第一终端设备确定的第一CPE起始点是CPE起始点#1和第二CPE起始点中较晚的一个。即该实现方式能保证高优先级的第二传输不被低优先级的第一传输阻塞。
如图12所示，假设该时隙m上UE2的传输优先级高于UE3的传输优先级，如果UE1的传输优先级低于UE2的传输优先级，如果UE1确定CPE起始点#2早于CPE起始点#3，且CPE起始点#1早于或等于CPE起始点#2，则UE1可以将CPE起始点#1调整到与CPE起始点#2相同的位置，或者将CPE起始点#1调整到CPE起始点#2之后的位置，以保证UE2的传输不被阻塞。如果该时隙m上UE2的传输优先级低于UE3的传输优先级，UE1的传输优先级低于UE3的传输优先级，当UE1确定CPE起始点#2晚于CPE起始点#3，且CPE起始点#1早于或等于CPE起始点#3时，则UE1可以将CPE起始点#1调整到与CPE起始点#3相同的位置，或者将CPE起始点#1调整到CPE起始点#3之后的位置，以保证UE3的传输不被阻塞。
在第四种实现方式中，在第一传输的优先级低于或等于第二传输的优先级的情况下，第一终端设备确定第三资源，第三资源的部分或全部资源用于第一终端设备进行第一传输。其中，第三资源不包括第二资源。
可选的，在第一传输的优先级低于或等于第二传输的优先级，且第一传输对应的CPE起始点#1晚于第二传输对应的CPE起始点#2的情况下，第一终端设备确定第三资源，即触发重选。
示例性的，如果其他终端设备(例如第二终端设备)的预约消息指示第二终端设备预约了多个连续的时隙，则第二资源位于该多个连续时隙的首个时隙，对应的，第一终端设备确定的第三资源不包括所述多个时隙的首个时隙；如果该预约消息指示第二终端设备预约了一个时隙，则第二资源的时域资源即为该时隙上，对应的，第一终端设备确定的第三资源不包括该一个时隙。
为了避免第一终端设备的传输block第二终端设备的传输，或者，第二终端设备的传输block第一终端设备的传输的情况发生，则第一终端设备可以不在第一资源上进行第一传输，通过触发资源重选，使得第一终端设备和第二终端设备都可以进行正常传输。其中，第一终端设备重选的第三资源可以占用其他时间单元(例如时隙#p)上的full RB set，用于第一终端设备的第一传输，即该第三资源与第二资源在频域上不重合。其中，触发资源重选的实现方式可参考上述相关描述，为了简洁，此处不再赘述。
需要说明的是，该第三资源在物理层协议中，实际上是指用于第一终端设备进行第一传输的候选资源，第一终端设备需要将该第三资源上报至MAC层，进一步在MAC层进行资源选择，即从第三资源中选择部分或全部资源，用于第一终端设备进行第一传输。其中，第一终端设备上报第三资源至MAC层的具体实现方式可参考上述图9的相关描述，为了简洁，这里不重复赘述。
还需要指示的是，如果预约消息预约了多个连续的时隙，则第二资源就在该多个连续时隙的首个时隙；如果该预约消息预约了一个时隙，第二资源就在该时隙上。
示例性的，如图12所示，假设该时隙m上UE1小于UE2的传输优先级，且小于UE3的传输优先级，而且UE1确定第一传输所选择的资源#1的CPE起始点#1晚于CPE起始点#2，且晚于CPE起始点#3，则UE1放弃为第一传输选择的资源，即UE1确定不在该时隙m上进行第一传输。可选的， 通过资源重选UE1可以选择为第一传输选择时隙m-2上的资源进行传输，避免UE1的传输被其他UE的传输阻塞。
可选的，在该实现方式中，UE1可以根据传输优先级，确定是否进行资源重选，即不考虑各个UE预约或选择的资源所对应的CPE起始点的位置。例如当确定该时隙m上UE1的传输优先级小于UE2的传输优先级的情况下，UE1可以确定触发资源重选，避免在该时隙m上的传输被其他高优先级的传输阻塞。
可选的，在该实现方式中，UE1可以根据传输优先级和CPE起始点，确定是否进行资源重选。例如当确定该时隙m上UE1的传输优先级小于UE2的传输优先级，同时UE1的CPE起始点#1的位置晚于UE2的CPE起始点#2的情况下，UE1可以确定触发资源重选，避免在该时隙m上的传输被其他高优先级的传输阻塞。
在第五种实现方式中，在第一传输的优先级高于第二传输的优先级，且第一传输的优先级低于第三传输的优先级的情况下，第一终端设备确定第一CPE起始点为第一预设CPE起始点或者第二预设CPE起始点。
其中，在第一终端设备确定第一CPE起始点为第一预设CPE起始点或者第二预设CPE起始点之前，该方法还包括：第一终端设备接收第二预约消息，第二预约消息指示第三终端设备预约的第三资源，第三资源与第一资源在同一时间单元上的至少部分频域资源重合；第一终端设备根据第二预约消息确定第三CPE起始点和第三资源对应的第三传输的优先级，第三CPE起始点与第三资源对应。进一步的，第一终端设备根据第二传输的优先级、第二CPE起始点、第三传输的优先级、第三CPE起始点和第一传输的优先级，确定第一CPE起始点。
应理解，第三CPE起始点与第三资源对应，可以理解为，该第三资源的频域资源占用partial RB set，则第三CPE起始点可以采用上述方式(1)确定，例如第三CPE起始点可以是位于在前一时间单元上的最后一个符号内，当前时间单元则用于第三资源的传输。另外，第一终端设备根据第二预约消息确定第三CPE起始点，可以是第一终端设备根据第三传输的优先级确定第三CPE起始点；或者，也可以是第一终端设备根据第二预约消息的CPE起始点确定第三CPE起始点。
换句话说，由于第一传输的优先级高于第二传输的优先级，且第一传输的优先级低于第三传输的优先级，考虑到第二CPE起始点和第三CPE起始点可以是根据上述方式(1)确定的第一预设CPE起始点，则UE1确定的第一CPE起始点也可以是第一预设CPE起始点。示例性的，如果第三资源对应的第三CPE起始点早于或等于CPE起始点#1和第二CPE起始点，则UE1可以不作调整，此时CPE起始点#1即为第一CPE起始点，这样可以保证第三传输的正常进行。如果CPE起始点#1早于第三CPE起始点，则UE1可以将CPE起始点#1调整至第三CPE起始点的位置，或者调整至第三CPE起始点之后，得到第一CPE起始点，保证UE3的传输正常进行。如果CPE起始点#1晚于第二CPE起始点，则UE1可以将CPE起始点#1调整至第二CPE起始点的位置，或者调整至第二CPE起始点之前，得到第一CPE起始点，保证第一传输的正常进行。
如图12所示，假设该时隙m上UE2的传输优先级高于UE3的传输优先级，如果UE1的传输优先级高于UE2的传输优先级，且低于UE3的传输优先级，UE1确定CPE起始点#2早于CPE起始点#3，且CPE起始点#1早于或等于CPE起始点#2，则UE1可以不作调整，此时UE1的传输可以正常进行。如果UE1确定CPE起始点#2晚于或不早于CPE起始点#3，且CPE起始点#1早于或不晚于CPE起始点#2，则UE1也可以不作调整，此时UE3的传输可以正常进行。如果UE1确定CPE起始点#2等于CPE起始点#3，且CPE起始点#1不同于CPE起始点#2和CPE起始点#3，则UE1可以将CPE起始点#1调整到与CPE起始点#2和CPE起始点#3相同的起始位置，这样UE1的传输可以正常进行。
在第六种实现方式中，在第二传输的优先级高于或等于第一传输的优先级的情况下，第一终端设备确定第一CPE起始点为第二预设CPE起始点。其中，第二预设CPE起始点和第一预设CPE起始点重合，第二预设CPE起始点是预设CPE起始点集合中的一个。
需要指出的是，这里第二预设CPE起始点是预设CPE起始点集合中的一个，不限于在第二传输的优先级高于或等于第一传输的优先级的情况下，第二预设CPE起始点和预设CPE起始点集合的具体释义请参见上文相关描述。
应理解，根据上述方式(1)和(2)可知，第二预设CPE起始点和第一预设CPE起始点重合。因 此，在第一终端设备根据感知到的占用partial RB set的第二终端设备的预约的情况下，第一终端设备根据接收到第一预约消息确定第二传输的优先级高于或等于第一传输的优先级时，第一终端设备可以采用上述方式(2)确定第一CPE起始点。也就是说，第一CPE起始点和第二CPE起始点的位置相同，此时较低优先级的第一终端设备的传输可以正常进行。示例性的，如果第二CPE起始点晚于第一资源对应的CPE起始点#1，则UE1的传输会block UE2，则UE1可以将CPE起始点#1调整到第二CPE起始点的位置，或者调整到第二CPE起始点之后，得到第一CPE起始点，这样UE2的传输可以正常进行；如果第二资源对应的第二CPE起始点早于第一资源对应的CPE起始点#1，则UE1可以不作调整，此时CPE起始点#1即为第一CPE起始点，这样可以保证UE2的传输正常进行。
如图12所示，假设该时隙m上UE2的传输优先级高于UE3，如果UE1的传输优先级低于UE3的传输优先级，当UE1确定CPE起始点#2早于CPE起始点#3，且CPE起始点#1早于CPE起始点#2，则UE1可以将CPE起始点#1调整到与CPE起始点#2相同的位置，或者将CPE起始点#1调整到CPE起始点#2之后的位置，以保证UE2的传输不被阻塞。如果UE1确定的CPE起始点#2于CPE起始点#3，且CPE起始点#1晚于或等于CPE起始点#2，则UE1可以不作调整，这样可以保证UE2的传输正常进行。
需要说明的是，以上提供的各种实现方式仅是为便于理解方案给出的示例，不应构成对本申请技术方案的任何限定。
可选的，上述提供的多种实现方式都是在第一终端设备未发送预约消息的情况下，第一终端设备根据第二传输的优先级、第二CPE起始点和第一传输的优先级，确定的第一CPE起始点。应理解，未发送预约消息可以是指第一终端设备对于即将进行的第一传输并未提前向其他终端设备发送过任何预约消息，或者说，其他终端设备并不能感知、监听、或接收到第一终端设备发送的预约消息，因此也就不能及时获取第一终端设备进行第一传输所需要的第一资源，包括但不限于：预留间隔信息、频域资源信息、时域资源信息、优先级信息等。
可选地，如果在上述步骤S1110中，第一终端设备并未感知到第二终端设备的预约消息，则第一终端设备可以根据自身占用的full RB set资源，根据上述方式(2)或方式(3)确定第一CPE起始点。
可选地，如果第一终端设备在进行第一传输之前，向其他终端设备发送了预约消息，则第一终端设备可以根据自身占用的full RB set资源，根据上述方式(2)或方式(3)确定用于第一传输的第一CPE起始点，并且第一终端设备可以不执行上述方法1100的步骤，此时可以默认由第二终端设备进行上述处理，即第二终端设备根据第一CPE起始点、第一传输的优先级和第二传输的优先级，确定第二CPE起始点。其中，第二终端设备确定第二CPE起始点的具体实现方式，可参考下面情况2中第一终端设备确定第一CPE起始点的相关描述，为了简洁，此处先不做说明。
情况二：
针对第一终端设备预约了partial RB set资源(即第一资源)，第二终端设备选择了full RB set资源(即第二资源)的场景，对第一终端设备根据第二传输的优先级、第二CPE起始点和第一传输的优先级，确定第一CPE起始点的具体实现方式进行说明，未详尽说明的部分可参考上述情况一的相关描述，为了简洁，此处不重复赘述。
此时，第一资源占用第一时间单元(例如时隙#m)上的一个或多个资源块集合的部分频域资源，第二资源占用第一时间单元上的一个或多个资源块集合的全部频域资源。其中，第二CPE起始点可以是采用上述方式(2)或(3)确定的第二预设CPE起始点。在该情况下，第二CPE起始点是根据第二传输的优先级(例如priority或CAPC)确定的，第二传输的优先级是根据第一预约消息确定的；或者，第二CPE起始点是根据第一预约消息的CPE起始点确定的。
可选的，针对第一终端设备预约了partial RB set资源(即第一资源)，第二终端设备选择了full RB set资源(即第二资源)的场景，第一终端设备也可以根据上述方式(2)或(3)来确定第一传输对应的第一CPE起始点。
在第一种实现方式中，在第一传输的优先级高于或等于第二传输的优先级的情况下，第一终端设备确定第一CPE起始点不晚于第二CPE起始点。换句话说，第一CPE起始点可以是等于第二CPE起始点，也可以是早于第二CPE起始点，这样才不会导致高优先级的第一传输被低优先级的第二传输block。
图13是本申请实施例提供的资源选择的示意图。如图13所示，以不同终端设备预约或选择的资源在频域上包含一个RB set(例如，以一个RB set包含4个子信道，例如子信道0、子信道1、子信道2和子信道3为例)的全部或部分资源，在时域上包含一个时隙为例进行说明。假设UE1为第一传输选择的资源#1位于时隙m上的一个partial RB set，即资源#1占用时隙m上的子信道1。例如，该时隙m上的RB set为20MHz，则每个子信道为5MHz。应理解，在UE1进行第一传输之前，UE1需要在m-T3时刻进行预留空和重评估检查，时隙n之前为感知窗，时隙n之后为资源选择窗，在时隙n之前，UE1通过感知、监听、或接收其他UE(例如UE2)的预约消息，确定UE2同时预约了资源选择窗内的时隙m上的全部资源，即子信道0、子信道1、子信道2和子信道3。也就是说，UE1与UE2在时隙m上的频域资源存在部分重合。在该示例中，将UE2在资源选择窗内预约的资源称为资源#2，对应的CPE起始点称为CPE起始点#2。其中，CPE起始点#2可以是预定义的，例如根据上述方式(2)或(3)确定的第二预设CPE起始点，位于m-1时隙上的最后的一个符号内，或者位于m-1时隙上的最后的两个符号内。
示例性的，如果在执行步骤S1130之前，UE1为第一传输确定的CPE起始点#1早于或等于CPE起始点#2，则UE1可以不作调整，此时CPE起始点#1即为第一CPE起始点，UE1可以正常进行第一传输。如果CPE起始点#1晚于CPE起始点#2，则第一传输可能会被第二传输block，因此UE1可以将CPE起始点#1调整至与CPE起始点#2相同的位置，或者也可以将CPE起始点#1调整至CPE起始点#2之前，得到第一CPE起始点，这样第一传输可以正常进行。也就是说，第一终端设备确定的第一CPE起始点是CPE起始点#1和第二CPE起始点中较早的一个，以保证UE1的传输不被阻塞。即该实现方式能保证高优先级的第一传输不被低优先级的第二传输阻塞。
在第二种实现方式中，在第一传输的优先级等于第二传输的优先级的情况下，第一终端设备确定第一CPE起始点等于第二CPE起始点。应理解，由于第一传输的优先级等于第二传输的优先级，且第二CPE起始点可以是预定义的，例如上述第二预设CPE起始点，则可以将第一CPE起始点设置在第二CPE起始点的位置，可以避免相同优先级的第一传输和第二传输互相block。也就是说，第一终端设备确定的第一CPE起始点可以是上述第二预设CPE起始点。
可选的，在第一传输的优先级等于第二传输的优先级的情况下，第一终端设备确定根据上述方式(2)或(3)来确定第一CPE起始点，即第一CPE起始点等于第二预设CPE起始点，由于第二终端设备选择了full RB set资源(即第二资源)，则该第二资源对应的第二CPE起始点就是上述预设CPE起始点集合中的第二预设CPE起始点，此时第一CPE起始点和第二CPE起始点相同，都是根据上述方式(2)或(3)确定的第二预设CPE起始点，该方式通过使得相同优先级的传输选择相同的CPE起始点，保证不同传输都可以正常进行，不互相阻塞或被阻塞。
如图13所示，假设该时隙m上UE2的传输优先级等于UE1的传输优先级，如果UE1为第一传输所选择的资源#1的CPE起始点#1等于CPE起始点#2，则UE1可以不作调整，即UE1和UE2的传输都可以正常进行。如果CPE起始点#1晚于或早于CPE起始点#2的起始点，为了避免相同优先级的第一传输和第二传输互相阻塞，提高频谱利用率，则UE1可以将CPE起始点#1调整到与CPE起始点#2相同的位置。
在第三种实现方式中，在第一传输的优先级低于或等于第二传输的优先级的情况下，第一终端设备确定第一CPE起始点不早于第二CPE起始点。换句话说，第一CPE起始点可以是等于第二CPE起始点，也可以是晚于第二CPE起始点，这样才不会导致高优先级的第二传输被低优先级的第一传输block。
如图13所示，假设该时隙m上UE2预约的资源的传输的优先级高于或等于UE1的传输优先级，如果CPE起始点#1早于或等于CPE起始点#2，则UE1可以将CPE起始点#1调整到与CPE起始点#2相同的位置，或者将CPE起始点#1调整到CPE起始点#2之后的位置，以保证UE2的传输不被阻塞。如果CPE起始点#1晚于CPE起始点#2，则UE1可以不作调整，此时CPE起始点#1即为第一CPE起始点，这样可以保证UE2的传输正常进行。也就是说，UE1确定的第一CPE起始点是CPE起始点#1和CPE起始点#2中较晚的一个。即该实现方式能保证高优先级的第二传输不被低优先级的第一传输阻塞。
在第四种实现方式中，在第一传输的优先级低于或等于第二传输的优先级的情况下，第一终端设 备确定第三资源，第三资源的部分或全部资源用于第一终端设备进行第一传输。其中，第三资源不包括第二资源。
在该实现方式中，为了避免第一终端设备的传输block第二终端设备的传输，或者，第二终端设备的传输block第一终端设备的传输的情况发生，则第一终端设备可以不在第一资源上进行第一传输，通过触发资源重选，可以使得第一终端设备和第二终端设备都进行正常传输。其中，第一终端设备重选的第三资源可以占用其他时间单元(例如时隙#p)上的partial RB set，用于第一终端设备的第一传输，即该第三资源与第二资源在频域上不重合，避免传输阻塞。其中，触发资源重选，以及上报第三资源至MAC层的实现方式可参考上述相关描述，为了简洁，此处不再赘述。
如图13所示，假设该时隙m上UE2预约的资源的传输优先级高于或等于UE1的传输优先级，则UE1可以在资源选择窗重新为第一传输选择资源#3，例如时隙m-2上的一个partial RB set，即子信道0，这样UE1和UE2的传输可以正常进行。
在第五种实现方式中，在第一传输的优先级高于第二传输的优先级，且第一传输的优先级低于第三传输的优先级的情况下，第一终端设备确定第一CPE起始点为第一预设CPE起始点，或者第二预设CPE起始点。
其中，在第一终端设备确定第一CPE起始点为第一预设CPE起始点，或者第二预设CPE起始点之前，该方法还包括：第一终端设备接收第二预约消息，第二预约消息指示第三终端设备预约的第三资源，第三资源与第一资源在同一时间单元上的至少部分频域资源重合；第一终端设备根据第二预约消息确定第三CPE起始点和第三资源对应的第三传输的优先级，第三CPE起始点与第三资源对应。进一步的，第一终端设备根据第二传输的优先级、第二CPE起始点、第三传输的优先级、第三CPE起始点和第一传输的优先级，确定第一CPE起始点。
示例性的，考虑到第二CPE起始点和第三CPE起始点可以是根据上述方式(2)或(3)确定的第二预设CPE起始点，则UE1确定的第一CPE起始点也可以是第二预设CPE起始点。假设该时隙m上UE1的传输优先级高于UE2的传输优先级高，且小于UE3的传输优先级，UE1确定CPE起始点#3早于CPE起始点#2，且CPE起始点#1晚于或等于CPE起始点#2，则UE1可以不作调整，这样高优先级的UE3可以正常传输。如果UE1确定CPE起始点#2早于CPE起始点#3，且CPE起始点#1晚于CPE起始点#2，则UE1可以将CPE起始点#1调整到与CPE起始点#2相同的位置，或者将CPE起始点#1调整到CPE起始点#2之前的位置，这样UE1的传输可以正常进行。
需要说明的是，以上提供的各种实现方式仅是为便于理解方案给出的示例，不应构成对本申请技术方案的任何限定。
应理解，上述提供的多种实现方式都是在第一终端设备未发送预约消息的情况下，第一终端设备根据第二传输的优先级、第二CPE起始点和第一传输的优先级，确定的第一CPE起始点。
可选地，如果在上述步骤S1110中，第一终端设备并未感知到第二终端设备的预约消息，则第一终端设备可以根据自身占用的partial RB set资源，根据上述方式(1)确定第一CPE起始点。
可选地，如果第一终端设备在进行第一传输之前，向其他终端设备发送了预约消息，则第一终端设备可以根据自身占用的partial RB set资源，根据上述方式(1)确定用于第一传输的第一CPE起始点，并且第一终端设备可以不执行上述方法1100的步骤，此时可以默认由第二终端设备进行上述处理，即第二终端设备根据第一CPE起始点、第一传输的优先级和第二传输的优先级，确定第二CPE起始点。其中，第二终端设备确定第二CPE起始点的具体实现方式，可参考上述情况1中第一终端设备确定第一CPE起始点的相关描述，为了简洁，此处不重复赘述。
针对第一终端设备预约了partial RB set资源(即第一资源)，第二终端设备选择了full RB set资源(即第二资源)的场景，第一终端设备可以确定第一CPE起始点为第二预设CPE起始点，只要避免UE1和其他UE的传输造成阻塞即可。例如，在第二CPE起始点早于第一预设CPE起始点的情况下，第一终端设备可以确定第一CPE起始点为第二预设CPE起始点。
换句话说，由于CPE起始点#1是上述方式(1)中的第一预设CPE起始点，在确定第二CPE起始点早于第一预设CPE起始点的情况下，也就说明，第二CPE起始点早于CPE起始点#1，因此为了避免二者之间发生block，可以根据上述方式(2)或(3)确定第二预设CPE起始点为第一CPE起始点，此时第一CPE起始点为第二预设CPE起始点，这样UE1的传输可以正常进行。在该实现方式中，第 一终端设备确定第一CPE起始点时可以不考虑第一传输的优先级和/或第二传输的优先级。
需要说明的是，以上各实现方式仅是为便于理解方案给出的示例，不应构成对本申请技术方案的任何限定。
上文结合图1至图13，详细描述了本申请的通信方法侧实施例，下面将结合图14和图15，详细描述本申请的通信装置侧实施例。应理解，装置实施例的描述与方法实施例的描述相互对应，因此，未详细描述的部分可以参见前面方法实施例。
图14是本申请实施例提供的通信装置1000的示意性框图。如图14所示，该装置1000可以包括收发单元1010和处理单元1020。收发单元1010可以与外部进行通信，处理单元1020用于进行数据处理，收发单元1010还可以称为通信接口或收发单元。
在一种可能的设计中，该装置1000可实现对应于上文方法实施例中的第一终端设备(例如，UE1)执行的步骤或者流程，其中，处理单元1020用于执行上文方法实施例中第一终端设备的处理相关的操作，收发单元1010用于执行上文方法实施例中第一终端设备的收发相关的操作。
应理解，这里的设备1000以功能单元的形式体现。这里的术语“单元”可以指应用特有集成电路(application specific integrated circuit，ASIC)、电子电路、用于执行一个或多个软件或固件程序的处理器(例如共享处理器、专有处理器或组处理器等)和存储器、合并逻辑电路和/或其它支持所描述的功能的合适组件。在一个可选例子中，本领域技术人员可以理解，设备1000可以具体为上述实施例中的发送端，可以用于执行上述方法实施例中与发送端对应的各个流程和/或步骤，或者，设备1000可以具体为上述实施例中的接收端，可以用于执行上述方法实施例中与接收端对应的各个流程和/或步骤，为避免重复，在此不再赘述。
上述各个方案的设备1000具有实现上述方法中发送端所执行的相应步骤的功能，或者，上述各个方案的设备1000具有实现上述方法中接收端所执行的相应步骤的功能。所述功能可以通过硬件实现，也可以通过硬件执行相应的软件实现。所述硬件或软件包括一个或多个与上述功能相对应的模块；例如收发单元可以由收发机替代(例如，收发单元中的发送单元可以由发送机替代，收发单元中的接收单元可以由接收机替代)，其它单元，如处理单元等可以由处理器替代，分别执行各个方法实施例中的收发操作以及相关的处理操作。
此外，上述收发单元还可以是收发电路(例如可以包括接收电路和发送电路)，处理单元可以是处理电路。在本申请的实施例，图14中的装置可以是前述实施例中的接收端或发送端，也可以是芯片或者芯片系统，例如：片上系统(system on chip，SoC)。其中，收发单元可以是输入输出电路、通信接口。处理单元为该芯片上集成的处理器或者微处理器或者集成电路。在此不做限定。
图15示出了本申请实施例提供的通信装置2000的示意性框图。如图15所示，该装置2000包括处理器2010和收发器2020。其中，处理器2010和收发器2020通过内部连接通路互相通信，该处理器2010用于执行指令，以控制该收发器2020发送信号和/或接收信号。
可选地，该装置2000还可以包括存储器2030，该存储器2030与处理器2010、收发器2020通过内部连接通路互相通信。该存储器2030用于存储指令，该处理器2010可以执行该存储器2030中存储的指令。
在一种可能的实现方式中，装置2000用于实现上述方法实施例中的第一终端设备(例如，UE1)对应的各个流程和步骤。
应理解，设备2000可以具体为上述实施例中的发送端或接收端，也可以是芯片或者芯片系统。对应的，该收发器2020可以是该芯片的收发电路，在此不做限定。具体地，该设备2000可以用于执行上述方法实施例中与发送端或接收端对应的各个步骤和/或流程。
可选地，该存储器2030可以包括只读存储器和随机存取存储器，并向处理器提供指令和数据。存储器的一部分还可以包括非易失性随机存取存储器。例如，存储器还可以存储设备类型的信息。该处理器2010可以用于执行存储器中存储的指令，并且当该处理器2010执行存储器中存储的指令时，该处理器2010用于执行上述与发送端或接收端对应的方法实施例的各个步骤和/或流程。
在实现过程中，上述方法的各步骤可以通过处理器中的硬件的集成逻辑电路或者软件形式的指令完成。结合本申请实施例所公开的方法的步骤可以直接体现为硬件处理器执行完成，或者用处理器中的硬件及软件模块组合执行完成。软件模块可以位于随机存储器，闪存、只读存储器，可编程只读存储 器或者电可擦写可编程存储器、寄存器等本领域成熟的存储介质中。该存储介质位于存储器，处理器读取存储器中的信息，结合其硬件完成上述方法的步骤。为避免重复，这里不再详细描述。
应注意，本申请实施例中的处理器可以是一种集成电路芯片，具有信号的处理能力。在实现过程中，上述方法实施例的各步骤可以通过处理器中的硬件的集成逻辑电路或者软件形式的指令完成。上述的处理器可以是通用处理器、数字信号处理器、专用集成电路、现场可编程门阵列或者其他可编程逻辑器件、分立门或者晶体管逻辑器件、分立硬件组件。本申请实施例中的处理器可以实现或者执行本申请实施例中的公开的各方法、步骤及逻辑框图。通用处理器可以是微处理器或者该处理器也可以是任何常规的处理器等。结合本申请实施例所公开的方法的步骤可以直接体现为硬件译码处理器执行完成，或者用译码处理器中的硬件及软件模块组合执行完成。软件模块可以位于随机存储器，闪存、只读存储器，可编程只读存储器或者电可擦写可编程存储器、寄存器等本领域成熟的存储介质中。该存储介质位于存储器，处理器读取存储器中的信息，结合其硬件完成上述方法的步骤。
可以理解，本申请实施例中的存储器可以是易失性存储器或非易失性存储器，或可包括易失性和非易失性存储器两者。其中，非易失性存储器可以是只读存储器(read-only memory，ROM)、可编程只读存储器(programmable ROM，PROM)、可擦除可编程只读存储器(erasable PROM，EPROM)、电可擦除可编程只读存储器(electrically EPROM，EEPROM)或闪存。易失性存储器可以是随机存取存储器(random access memory，RAM)，其用作外部高速缓存。通过示例性但不是限制性说明，许多形式的RAM可用，例如静态随机存取存储器(static RAM，SRAM)、动态随机存取存储器(dynamic RAM，DRAM)、同步动态随机存取存储器(synchronous DRAM，SDRAM)、双倍数据速率同步动态随机存取存储器(double data rate SDRAM，DDR SDRAM)、增强型同步动态随机存取存储器(enhanced SDRAM，ESDRAM)、同步连接动态随机存取存储器(synchlink DRAM，SLDRAM)和直接内存总线随机存取存储器(direct rambus RAM，DR RAM)。应注意，本文描述的系统和方法的存储器旨在包括但不限于这些和任意其它适合类型的存储器。
图16是本申请实施例提供的芯片系统3000的示意性框图。如图16所示，该芯片系统3000(或者也可以称为处理系统)包括逻辑电路3010以及输入/输出接口(input/output interface)3020。
其中，逻辑电路3010可以为芯片系统3000中的处理电路。逻辑电路3010可以耦合连接存储单元，调用存储单元中的指令，使得芯片系统3000可以实现本申请各实施例的方法和功能。输入/输出接口3020，可以为芯片系统3000中的输入输出电路，将芯片系统3000处理好的信息输出，或将待处理的数据或信令信息输入芯片系统3000进行处理。
作为一种方案，该芯片系统3000用于实现上文各个方法实施例中由终端设备执行的操作。
例如，逻辑电路3010用于实现上文方法实施例中由第一终端设备执行的处理相关的操作，如图4所示实施例中第一终端设备执行的处理相关的操作，或图6所示实施例中第一终端设备执行的处理相关的操作，或图11所示实施例中第一终端设备执行的处理相关的操作；输入/输出接口3020用于实现上文方法实施例中由第一终端设备执行的发送和/或接收相关的操作，如图4所示实施例中的第一终端设备执行的发送和/或接收相关的操作，或图6所示实施例中第一终端设备执行的发送和/或接收相关的操作，或图11所示实施例中第一终端设备执行的发送和/或接收相关的操作。
再例如，逻辑电路3010用于实现上文方法实施例中由第二终端设备执行的处理相关的操作，如图4所示实施例中第二终端设备执行的处理相关的操作，或图6所示实施例中第二终端设备执行的处理相关的操作，或图11所示实施例中第二终端设备执行的处理相关的操作；输入/输出接口3020用于实现上文方法实施例中由第二终端设备执行的发送和/或接收相关的操作，如图4所示实施例中的第二终端设备执行的发送和/或接收相关的操作，或图6所示实施例中第二终端设备执行的发送和/或接收相关的操作，或图11所示实施例中第二终端设备执行的发送和/或接收相关的操作。
本申请实施例还提供一种计算机可读存储介质，其上存储有用于实现上述各方法实施例中由终端设备(如第一终端设备，又如第二终端设备)执行的方法的计算机指令。
本申请实施例还提供一种计算机程序产品，包含指令，该指令被计算机执行时以实现上述各方法实施例中由终端设备(如第一终端设备，又如第二终端设备)执行的方法。
本申请实施例还提供一种通信系统，该通信系统包括上文各实施例中的第一终端设备和第二终端设备。
上述提供的任一种装置中相关内容的解释及有益效果均可参考上文提供的对应的方法实施例，此处不再赘述。
本领域普通技术人员可以意识到，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，能够以电子硬件、或者计算机软件和电子硬件的结合来实现。这些功能究竟以硬件还是软件方式来执行，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。
所属领域的技术人员可以清楚地了解到，为描述的方便和简洁，上述描述的系统、装置和单元的具体工作过程，可以参考前述方法实施例中的对应过程，在此不再赘述。
在本申请所提供的几个实施例中，应该理解到，所揭露的系统、装置和方法，可以通过其它的方式实现。例如，以上所描述的装置实施例仅是示意性的，例如，所述单元的划分，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，例如多个单元或组件可以结合或者可以集成到另一个系统，或一些特征可以忽略，或不执行。另一点，所显示或讨论的相互之间的耦合或直接耦合或通信连接可以是通过一些接口，装置或单元的间接耦合或通信连接，可以是电性，机械或其它的形式。
所述作为分离部件说明的单元可以是或者也可以不是物理上分开的，作为单元显示的部件可以是或者也可以不是物理单元，即可以位于一个地方，或者也可以分布到多个网络单元上。可以根据实际的需要选择其中的部分或者全部单元来实现本实施例方案的目的。
另外，在本申请各个实施例中的各功能单元可以集成在一个处理单元中，也可以是各个单元单独物理存在，也可以两个或两个以上单元集成在一个单元中。
所述功能如果以软件功能单元的形式实现并作为独立的产品销售或使用时，可以存储在一个计算机可读取存储介质中。基于这样的理解，本申请的技术方案本质上或者说对现有技术做出贡献的部分或者该技术方案的部分可以以软件产品的形式体现出来，该计算机软件产品存储在一个存储介质中，包括若干指令用以使得一台计算机设备(可以是个人计算机，服务器，或者装置等)执行本申请各个实施例所述方法的全部或部分步骤。而前述的存储介质包括：U盘、移动硬盘、只读存储器、随机存取存储器、磁碟或者光盘等各种可以存储程序代码的介质。
以上所述，仅为本申请的具体实施方式，但本申请的保护范围并不局限于此，任何熟悉本技术领域的技术人员在本申请揭露的技术范围内，可轻易想到变化或替换，都应涵盖在本申请的保护范围之内。因此，本申请的保护范围应以所述权利要求的保护范围为准。

Claims (36)

  1. 一种通信方法，其特征在于，包括：
    第一终端设备接收预约消息，所述预约消息指示第二终端设备预约的第二资源；
    所述第一终端设备根据所述预约消息确定第二循环前缀拓展CPE长度，所述第二CPE长度与所述第二资源对应；
    所述第一终端设备根据第一CPE长度和所述第二CPE长度，确定第三资源或者调整所述第一CPE长度；其中，所述第一CPE长度是根据所述第一终端设备的第一传输的优先级确定的，且所述第一CPE长度与第一资源对应，所述第一资源是所述第一终端设备已经为所述第一传输选择的资源，所述第一资源与所述第二资源的至少部分时域资源重合，所述第三资源的部分或全部资源用于所述第一终端设备进行所述第一传输。
  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CPE长度和所述第二CPE长度，确定第三资源或者调整所述第一CPE长度，包括：
    在所述第一CPE长度小于所述第二CPE长度的情况下，所述第一终端设备确定所述第三资源。
  3. 根据权利要求2所述的方法，其特征在于，在所述第一CPE长度小于所述第二CPE长度的情况下，所述第一终端设备确定所述第三资源，包括：
    在所述第一CPE长度小于所述第二CPE长度，且所述第一资源与所述第二资源的至少部分频域资源重合的情况下，所述第一终端设备确定所述第三资源。
  4. 根据权利要求1至3中任一项所述的方法，其特征在于，所述第一终端设备根据第一CPE长度和所述第二CPE长度，确定第三资源或者调整所述第一CPE长度，包括：
    在所述第一CPE长度等于所述第二CPE长度，所述第一资源与所述第二资源的至少部分频域资源重合，且所述预约消息的参考信号的接收功率RSRP高于第一阈值的情况下，所述第一终端设备确定所述第三资源。
  5. 根据权利要求1至4中任一项所述的方法，其特征在于，所述第一终端设备根据第一CPE长度和所述第二CPE长度，确定第三资源或者调整所述第一CPE长度，包括：
    所述第一终端设备根据所述第一CPE长度和所述第二CPE长度，调整所述第一终端设备在第一时间单元上的所述第一CPE长度为第三CPE长度，所述第一时间单元是所述第一资源和所述第二资源的重合部分的时域资源，所述第三CPE长度大于或等于所述第二CPE长度。
  6. 根据权利要求1至5中任一项所述的方法，其特征在于，所述方法还包括：
    所述第一终端设备根据所述预约消息确定第四CPE长度，所述第四CPE长度与第四资源对应，所述第四CPE长度大于所述第二CPE长度；
    其中，所述第一终端设备根据第一CPE长度和所述第二CPE长度，确定第三资源或者调整所述第一CPE长度，包括：
    所述第一终端设备根据所述第一CPE长度、所述第四CPE长度和所述第二CPE长度，调整所述第一终端设备在第一时间单元上的所述第一CPE长度为第三CPE长度，所述第一时间单元是所述第一资源和所述第二资源的重合部分的时域资源，所述第三CPE长度大于或等于所述第四CPE长度。
  7. 根据权利要求5或6所述的方法，其特征在于，所述第一终端设备根据所述第一CPE长度和所述第二CPE长度，调整所述第一终端设备在第一时间单元上的所述第一CPE长度为第三CPE长度，包括：
    在所述第一CPE长度大于或小于所述第二CPE长度，所述第一资源与所述第二资源的至少部分频域资源重合，且所述预约消息的RSRP低于第一阈值的情况下，所述第一终端设备调整在所述第一时间单元上的所述第一CPE长度为所述第三CPE长度。
  8. 根据权利要求5至7中任一项所述的方法，其特征在于，所述第一终端设备根据所述第一CPE长度和第二CPE长度，调整所述第一终端设备在所述第一时间单元上的所述第一CPE长度为第三CPE长度，包括：
    在所述第一CPE长度大于或小于所述第二CPE长度，且所述第一资源与所述第二资源的频域资源不重合的情况下，所述第一终端设备调整在所述第一时间单元上的所述第一CPE长度为所述第三CPE 长度。
  9. 根据权利要求1至8中任一项所述的方法，其特征在于，所述第二CPE长度是根据所述第二资源对应的传输的优先级确定的；或者，所述第二CPE长度是根据所述预约消息所占用的CPE长度确定的。
  10. 一种通信方法，其特征在于，包括：
    第一终端设备接收预约消息，所述预约消息指示第二终端设备预约的第二资源；
    所述第一终端设备根据所述预约消息确定第二循环前缀拓展CPE长度，所述第二CPE长度与所述第二资源对应；
    所述第一终端设备根据第一CPE长度和所述第二CPE长度，确定候选资源集合，所述候选资源集合的部分或全部资源用于所述第一终端设备进行第一传输，所述第一CPE长度是根据所述第一终端设备的所述第一传输的优先级确定的。
  11. 根据权利要求10所述的方法，其特征在于，所述第一终端设备根据第一CPE长度和所述第二CPE长度，确定候选资源集合，包括：
    在所述第一CPE长度小于所述第二CPE长度的情况下，所述第一终端设备排除第三资源，得到所述候选资源集合，所述第三资源为所述第二资源所在时间单元上的频域资源。
  12. 根据权利要求10或11所述的方法，其特征在于，所述第一终端设备根据第一CPE长度和所述第二CPE长度，确定候选资源集合，包括：
    在所述第一CPE长度大于或等于所述第二CPE长度的情况下，所述第一终端设备将第四资源作为所述候选资源集合；
    其中，所述第四资源包括：
    第一时间单元上的资源，所述第一时间单元与所述第二资源所在的时间单元不重叠；和/或，
    所述第二资源所在时间单元上的部分或全部资源。
  13. 根据权利要求10或11所述的方法，其特征在于，所述第一终端设备根据第一CPE长度和所述第二CPE长度，确定候选资源集合，包括：
    在所述第一CPE长度等于所述第二CPE长度，且所述预约消息的参考信号的接收功率RSRP高于第一阈值的情况下，所述第一终端设备排除与所述第二资源至少部分重合的资源，得到所述候选资源集合。
  14. 根据权利要求12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所述预约消息确定第三CPE长度，所述第三CPE长度与第三资源对应，所述第三CPE长度小于所述第二CPE长度，所述第三资源与所述第二资源位于同一时间单元。
  15. 根据权利要求10至14中任一项所述的方法，其特征在于，
    所述候选资源集合包括第一候选资源子集，和/或第二候选资源子集，所述第一候选资源子集中的资源对应的第二CPE长度等于所述第一CPE长度，所述第二候选资源子集中的资源对应的第二CPE长度小于所述第一CPE长度。
  16. 根据权利要求10至15中任一项所述的方法，其特征在于，
    所述候选资源集合包括第三候选资源子集，所述第三候选资源子集中的资源对应的第二CPE长度等于所述第一CPE长度，以及所述第三候选资源子集中的资源为第一时间单元上的资源，所述第一时间单元与所述第二资源所在的时间单元不重叠。
  17. 根据权利要求10至16中任一项所述的方法，其特征在于，所述方法还包括：
    在所述候选资源集合无法满足所述第一终端设备的第一传输的需求的情况下，所述第一终端设备增加所述第一CPE长度；
    其中，所述第一终端设备根据第一CPE长度和所述第二CPE长度，确定候选资源集合，包括：
    所述第一终端设备根据增加后的所述第一CPE长度和所述第二CPE长度，确定所述候选资源集合。
  18. 根据权利要求17所述的方法，其特征在于，所述候选资源集合无法满足所述第一终端设备的第一传输的需求，包括以下一项或多项：
    所述候选资源集合中的候选资源所在的时间单元数量低于第二阈值；或者，
    所述候选资源集合中的候选资源数量低于第三阈值。
  19. 根据权利要求10至18中任一项所述的方法，其特征在于，所述第二CPE长度是根据所述第二资源对应的传输的优先级确定的；或者，所述第二CPE长度是根据所述预约消息所占用的CPE长度确定的。
  20. 一种通信方法，其特征在于，包括：
    第一终端设备接收第一预约消息，所述第一预约消息指示第二终端设备预约的第二资源；
    所述第一终端设备根据所述第一预约消息确定第二循环前缀拓展CPE起始点和所述第二资源对应的第二传输的优先级，所述第二CPE起始点与所述第二资源对应；
    所述第一终端设备根据所述第二传输的优先级、所述第二CPE起始点和第一传输的优先级，确定第一CPE起始点或第三资源，其中，所述第一CPE起始点与第一资源对应，所述第一资源是所述第一终端设备为所述第一传输选择的资源，所述第一资源与所述第二资源在同一时间单元上的至少部分频域资源重合，所述第三资源的部分或全部资源用于所述第一终端设备进行所述第一传输。
  21. 根据权利要求20所述的方法，其特征在于，所述第一终端设备根据所述第二传输的优先级、所述第二CPE起始点和第一传输的优先级，确定第一CPE起始点或第三资源，包括：
    在所述第一传输的优先级高于或等于所述第二传输的优先级的情况下，所述第一终端设备确定所述第一CPE起始点不晚于所述第二CPE起始点。
  22. 根据权利要求20或21所述的方法，其特征在于，所述第一终端设备根据所述第二传输的优先级、所述第二CPE起始点和第一传输的优先级，确定第一CPE起始点或第三资源，包括：
    在所述第一传输的优先级等于所述第二传输的优先级的情况下，所述第一终端设备确定所述第一CPE起始点等于所述第二CPE起始点。
  23. 根据权利要求20至22中任一项所述的方法，其特征在于，所述第一终端设备根据所述第二传输的优先级、所述第二CPE起始点和第一传输的优先级，确定第一CPE起始点或第三资源，包括：
    在所述第一传输的优先级低于或等于所述第二传输的优先级的情况下，所述第一终端设备确定所述第一CPE起始点不早于所述第二CPE起始点。
  24. 根据权利要求20至23中任一项所述的方法，其特征在于，所述第一终端设备根据所述第二传输的优先级、所述第二CPE起始点和第一传输的优先级，确定第一CPE起始点或第三资源，包括：
    在所述第一传输的优先级低于或等于所述第二传输的优先级的情况下，所述第一终端设备确定所述第三资源，其中，所述第三资源不包括所述第二资源。
  25. 根据权利要求20至24中任一项所述的方法，其特征在于，所述方法还包括：
    所述第一终端设备接收第二预约消息，所述第二预约消息指示第三终端设备预约的第三资源，所述第三资源与所述第一资源在同一时间单元上的至少部分频域资源重合；
    所述第一终端设备根据所述第二预约消息确定第三CPE起始点和所述第三资源对应的第三传输的优先级，所述第三CPE起始点与所述第三资源对应；
    其中，所述第一终端设备根据所述第二传输的优先级、所述第二CPE起始点和第一传输的优先级，确定第一CPE起始点或第三资源，包括：
    所述第一终端设备根据所述第二传输的优先级、所述第二CPE起始点、所述第三传输的优先级、所述第三CPE起始点和所述第一传输的优先级，确定所述第一CPE起始点，其中，在所述第一传输的优先级高于所述第二传输的优先级，且所述第一传输的优先级低于所述第三传输的优先级的情况下，所述第一终端设备确定所述第一CPE起始点为第一预设CPE起始点或第二预设CPE起始点，所述第二预设CPE起始点是预设CPE起始点集合中的一个。
  26. 根据权利要求25所述的方法，其特征在于，所述第一预设CPE起始点和/或所述预设CPE起始点集合是预配置的。
  27. 根据权利要求20至26中任一项所述的方法，其特征在于，所述第一资源占用第一时间单元上的一个或多个资源块集合的全部频域资源，所述第二资源占用所述第一时间单元上的一个或多个资源块集合的部分频域资源；
    其中，所述第二CPE起始点是第一预设CPE起始点。
  28. 根据权利要求20至27中任一项所述的方法，其特征在于，第二预设CPE起始点和第一预设 CPE起始点重合，所述第二预设CPE起始点是预设CPE起始点集合中的一个；
    其中，所述第一终端设备根据所述第二传输的优先级、所述第二CPE起始点和第一传输的优先级，确定所述第一CPE起始点或第三资源，包括：
    在所述第二传输的优先级高于或等于所述第一传输的优先级的情况下，所述第一终端设备确定所述第一CPE起始点为所述第二预设CPE起始点。
  29. 根据权利要求20至26中任一项所述的方法，其特征在于，所述第一资源占用第一时间单元上的一个或多个资源块集合的部分频域资源，所述第二资源占用所述第一时间单元上的一个或多个资源块集合的全部频域资源；
    其中，所述第二CPE起始点是第二预设CPE起始点，所述第二预设CPE起始点是预设CPE起始点集合中的一个。
  30. 根据权利要求29所述的方法，其特征在于，
    所述第二CPE起始点是根据所述第二传输的优先级或信道接入优先级CAPC确定的，所述第二传输的优先级或所述CAPC是根据所述第一预约消息确定的；或者，
    所述第二CPE起始点是根据所述第一预约消息的CPE起始点确定的。
  31. 一种通信装置，其特征在于，包括用于执行权利要求1至9、10至19、20至30中任一项所述的方法的模块或单元。
  32. 一种通信装置，其特征在于，所述装置包括处理器，所述处理器与存储器耦合，所述存储器存储有指令，所述指令被所述处理器运行时，使得所述处理器执行如权利要求1至9、10至19、20至30中任一项所述的方法。
  33. 一种通信装置，其特征在于，所述装置包括逻辑电路，所述逻辑电路用于与输入/输出接口耦合，通过所述输入/输出接口传输数据，以执行如权利要求1至9中任一项所述的方法，或者以执行如权利要求10至19中任一项所述的方法，或者以执行如权利要求20至30中任一项所述的方法。
  34. 一种芯片，其特征在于，包括：处理器，用于从存储器中调用并运行计算机程序，使得安装有所述芯片的通信装置执行如权利要求1至9中任一项所述的方法，或者使得安装有所述芯片的通信装置执行如权利要求10至19中任一项所述的方法，或者使得安装有所述芯片的通信装置执行如权利要求20至30中任一项所述的方法。
  35. 一种计算机可读存储介质，其特征在于，所述计算机可读存储介质用于存储计算机程序，当所述计算机程序在计算机上运行时，使得所述计算机执行如权利要求1至9中任一项所述的方法，或者使得所述计算机执行如权利要求10至19中任一项所述的方法，或者使得所述计算机执行如权利要求20至30中任一项所述的方法。
  36. 一种计算机程序产品，其特征在于，所述计算机程序产品包括：计算机程序代码，当所述计算机程序代码被运行时，实现如权利要求1至9中任一项所述的方法，或者实现如权利要求10至19中任一项所述的方法，或者实现如权利要求20至30中任一项所述的方法。
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