CN117750443A

CN117750443A - Communication method and device

Info

Publication number: CN117750443A
Application number: CN202310401598.4A
Authority: CN
Inventors: 刘云; 黎超
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2022-09-20
Filing date: 2023-04-07
Publication date: 2024-03-22
Also published as: WO2024061092A1

Abstract

The embodiment of the application provides a communication method and device. The method comprises the following steps: the first terminal equipment receives the reservation message and is used for indicating a second resource reserved by the second terminal equipment; the first terminal equipment determines a second cyclic prefix to expand the length of the CPE according to the reservation message, and the second CPE length corresponds to a second resource; the first terminal equipment determines a third resource or adjusts the first CPE length according to the first CPE length and the second CPE length, the first CPE length corresponds to a first resource, the first resource is a resource which the first terminal equipment has selected for the first transmission, the first resource coincides with at least part of time domain resources of the second resource, and part or all of the resources of the third resource are used for the first terminal equipment to carry out the first transmission. By introducing CPE length in the process of reserving and re-evaluating the resources, the resources for the first transmission are re-determined, the utilization rate of spectrum resources is improved, and the network transmission performance is ensured.

Description

Communication method and device

The present application claims priority to the national intellectual property office, application number 202211140512.9, chinese patent application entitled "a resource selection method and communication device", 20, 2022, 09, 20, and to the national intellectual property office, application number 202211213107.5, chinese patent application entitled "communication method and device", 30, 2022, the entire contents of which are incorporated herein by reference.

Technical Field

The present application relates to the field of communications, and more particularly, to a communication method and apparatus.

Background

In a wireless communication system, spectrum resources can be divided into licensed spectrum and unlicensed spectrum. In a Sidelink (SL) transmission, enabling unlicensed spectrum is an important evolution direction. In unlicensed spectrum, a terminal device needs to select physical resources for transmitting data in a resource pool. For example, the terminal device may preempt the channel by listen before talk (listen before talk, LBT) or share the resource transmission data obtained after the other terminal device preempts the channel.

Because the unlicensed spectrum has low use cost and large access freedom, any technology can be used as long as a certain access rule is satisfied. Therefore, the situation that different terminal devices reserve the same resource may occur, that is, the resources selected by different terminal devices collide, resulting in transmission blocking.

Therefore, how to ensure the utilization rate of spectrum resources and improve the transmission performance of the system is a problem to be solved.

Disclosure of Invention

The application provides a communication method and a communication device, which avoid resource collision between different terminal devices by considering the influence of cyclic prefix expansion (cyclic prefix extension, CPE) during resource selection, thereby improving the frequency spectrum utilization rate and the system transmission performance.

In a first aspect, a communication method is provided, which may be performed by a first terminal device (e.g., user equipment (UE 1)), or may also be performed by a chip or a circuit for the first terminal device, which is not limited in this application. For convenience of description, an example will be described below as being executed by the first terminal device.

The method comprises the following steps: the first terminal equipment receives a reservation message, and the reservation message indicates a second resource reserved by the second terminal equipment; the first terminal equipment determines a second cyclic prefix to expand the length of the CPE according to the reservation message, and the second CPE length corresponds to a second resource; the first terminal equipment determines a third resource or adjusts the length of the first CPE according to the length of the first CPE and the length of the second CPE; the first CPE length is determined according to a priority of a first transmission of the first terminal device, the first CPE length corresponds to a first resource, the first resource is a resource that the first terminal device has selected for the first transmission, the first resource coincides with at least part of time domain resources of the second resource, and part or all of resources of the third resource are used for the first transmission by the first terminal device.

According to the scheme provided by the application, when the first terminal equipment senses that the reserved resources of other terminal equipment are coincident with the selected resources of the first terminal equipment on the time unit, whether to continue occupying the time unit is determined by comparing the CPE length, so that transmission blocking of the first terminal equipment by the transmission of other terminal equipment (or transmission blocking of the first terminal equipment by the transmission of other terminal equipment) is avoided as much as possible, transmission efficiency is improved, and unnecessary waste of spectrum resources is avoided. The method comprises the steps of introducing CPE length in the process of reserving and re-evaluating the resources, re-determining the resources for first transmission, improving the utilization rate of spectrum resources and guaranteeing the transmission performance.

With reference to the first aspect, in some implementations of the first aspect, the determining, by the first terminal device, the third resource or adjusting the first CPE length according to the first CPE length and the second CPE length includes: and under the condition that the first CPE length is smaller than the second CPE length, the first terminal equipment determines a third resource.

Based on the above scheme, for the case that the time domain resource of the resource reserved by other UEs coincides with the time domain resource of the first resource (for example, time slot m), by comparing the first CPE length with other CPE lengths, as long as the CPE length corresponding to the transmission of other UEs is greater than the first CPE length, the first terminal device performs resource reselection, so that the first transmission of the first terminal device is prevented from being blocked by the transmission of other UEs, and user experience is ensured. It should be appreciated that the implementation is not limited as to whether the frequency domain resources on the time domain resources coincide.

With reference to the first aspect, in some implementations of the first aspect, in a case where the first CPE length is smaller than the second CPE length, the first terminal device determines the third resource includes: and under the condition that the first CPE length is smaller than the second CPE length and the first resource is overlapped with at least part of the frequency domain resource of the second resource, the first terminal equipment determines a third resource.

Based on the above scheme, for the case that the time domain resource of the resource reserved by other UEs coincides with the time domain resource of the first resource (for example, time slot m), and the frequency domain resource on the time domain resource coincides, by comparing the length of the first CPE with the length of other CPEs, as long as the length of the CPE corresponding to the transmission of other UEs is greater than the length of the first CPE, the first terminal device performs resource reselection, so that the first transmission of the first terminal device is prevented from being blocked by the transmission of other UEs, and meanwhile, unnecessary waste of the frequency domain resource is avoided, and the spectrum utilization rate and the system transmission performance are improved.

With reference to the first aspect, in some implementations of the first aspect, the determining, by the first terminal device, the third resource or adjusting the first CPE length according to the first CPE length and the second CPE length includes: in case the first CPE length is equal to the second CPE length, the first resource coincides with at least part of the frequency domain resources of the second resource, and the received power (reference signal received power, RSRP) of the reference signal of the reservation message is above a first threshold, the first terminal device determines a third resource.

Based on the above scheme, for the case that the time domain resource of the resource reserved by other UEs coincides with the time domain resource of the first resource (for example, time slot m), the frequency domain resource coincides at least partially, and the RSRP of the reserved 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, so as to avoid that the first transmission of the first terminal device is blocked by the transmission of other UEs, and meanwhile, avoid unnecessary waste of the frequency domain resource, improve the spectrum utilization rate, and reduce the transmission delay.

With reference to the first aspect, in some implementations of the first aspect, the determining, by the first terminal device, the third resource or adjusting the first CPE length according to the first CPE length and the second CPE length includes: the first terminal equipment adjusts the first CPE length of the first terminal equipment on a first time unit to be a third CPE length according to the first CPE length and the second CPE length, wherein the first time unit is a time domain resource of the superposition part of the first resource and the second resource, and the third CPE length is larger than or equal to the second CPE length.

Based on the above scheme, for the scenario that resources reserved by different terminal devices (for example, UE1 and UE 2) overlap in time domain, by comparing CPE lengths corresponding to the resources reserved by different terminal devices, especially in the case that the CPE lengths are different, UE1 can choose to adjust its own CPE length, so as to avoid transmission blocking of UE1 by UE2 and/or transmission blocking of UE2 by UE1, and ensure user experience and transmission performance.

With reference to the first aspect, in some implementations of the first aspect, the first terminal device determines a fourth CPE length according to the subscription message, the fourth CPE length corresponding to a fourth resource, the fourth CPE length being greater than the second CPE length; 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, including: the first terminal equipment adjusts the first CPE length of the first terminal equipment on a first time unit to be a third CPE length according to the first CPE length, the fourth CPE length and the second CPE length, wherein the first time unit is a time domain resource of the overlapping part of the first resource and the second resource, and the third CPE length is larger than or equal to the fourth CPE length.

Based on the above scheme, for the scenario that resources reserved by multiple other terminal devices (for example, UE2 and UE 4) overlap in time domain, by comparing the CPE length corresponding to the transmission with the highest priority with the first CPE length of UE1, especially in the case that the CPE lengths are different, the first terminal device can choose to adjust its own CPE length, so as to avoid that the first transmission of the first terminal device is blocked by the transmission of other UEs, and/or avoid that the transmission of other terminal devices is blocked by the transmission of the first terminal device, ensure user experience and transmission performance, and improve user transmission efficiency and spectrum utilization.

With reference to the first aspect, in some implementations of the first aspect, the adjusting, by the first terminal device, the first CPE length of the first terminal device on the first time unit to be the third CPE length according to the first CPE length and the second CPE length includes: and when the first CPE length is greater than or less than the second CPE length, the first resource is overlapped with at least part of frequency domain resources of the second resource, and the RSRP of the reservation message is lower than a first threshold value, the first terminal equipment adjusts the first CPE length on the first time unit to be the third CPE length.

Based on the scheme, on the basis of comparing the length of the first CPE and the length of the second CPE, RSRP limitation of reservation information is considered, so that transmission blocking of other UE by UE1 can be effectively avoided, or transmission blocking of UE1 by other UE is avoided, and system transmission performance and spectrum utilization rate are ensured.

With reference to the first aspect, in some implementations of the first aspect, the adjusting, by the first terminal device, the first CPE length of the first terminal device on the first time unit to be the third CPE length according to the first CPE length and the second CPE length includes: and under the condition that the first CPE length is larger or smaller than the second CPE length and the frequency domain resources of the first resource and the second resource are not overlapped, the first terminal equipment adjusts the first CPE length on the first time unit to be the third CPE length.

Based on the scheme, on the basis of comparing the length of the first CPE and the length of the second CPE, whether the frequency domain resources of the reserved resources coincide or not is considered, so that transmission of the UE1 can be effectively prevented from being blocked by transmission of other UEs, or transmission of the UE1 is prevented from being blocked by transmission of other UEs, and system transmission performance and spectrum utilization rate are ensured.

With reference to the first aspect, in certain implementations of the first aspect, the second CPE length is determined according to a priority of a transmission corresponding to the second resource; alternatively, the second CPE length is determined based on the CPE length occupied by the subscription message

Based on the above scheme, the first terminal device can determine the length of the CPE occupied by the transmission of each reservation message and the priority of the transmission of the reservation resource of each reservation message by receiving one or more reservation messages, and further determine the second CPE length according to the CPE length and the transmission priority.

In a second aspect, a communication method is provided, which may be performed by a first terminal device (e.g. UE 1) or may also be performed by a chip or circuit for the first terminal device, which is not limited in this application. For convenience of description, an example will be described below as being executed by the first terminal device.

The method comprises the following steps: the first terminal equipment receives a reservation message, and the reservation message indicates a second resource reserved by the second terminal equipment; the first terminal equipment determines a second cyclic prefix to expand the length of the CPE according to the reservation message, and the second CPE length corresponds to a second resource; the first terminal equipment 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 first transmission by the first terminal equipment, and the first CPE length is determined according to the priority of the first transmission of the first terminal equipment.

According to the scheme provided by the application, the candidate resource set is determined by comparing CPE lengths of different terminal devices. And resource selection is performed based on the length of the CPE, so that transmission blocking of the first terminal equipment by transmission of other terminal equipment (or transmission blocking of the first terminal equipment by transmission of other terminal equipment) is avoided in a targeted manner, the transmission efficiency of the terminal equipment is improved, unnecessary waste of spectrum resources is avoided, and the transmission performance of the system is ensured.

With reference to the second aspect, in some implementations of the second aspect, the determining, by the first terminal device, a candidate resource set according to the first CPE length and the second CPE length includes: and under the condition that the length of the first CPE is smaller than that of the second CPE, the first terminal equipment excludes third resources to obtain a candidate resource set, wherein the third resources are frequency domain resources on a time unit where the second resources are located.

Based on the above scheme, when the UE1 senses that the length of other CPE is greater than the length of the first CPE, the UE1 can exclude the frequency domain resource on the time unit where the reserved resource corresponding to the length of other CPE is located from the resource pool to be selected, so that blocking of transmission between different terminal devices is avoided, unnecessary waste of spectrum resources (especially on the time unit where the second resource is located, the frequency domain resource not included by the second resource) can be reduced, transmission efficiency of the terminal device is improved, and user experience is improved.

With reference to the second aspect, in some implementations of the second aspect, the determining, by the first terminal device, a candidate resource set according to the first CPE length and the second CPE length includes: the first terminal equipment takes the fourth resource as a candidate resource set under the condition that the first CPE length is greater than or equal to the second CPE length; wherein the fourth resource comprises: the resources on the first time unit are not overlapped with the time unit where the second resource is located, namely the resources on the time unit which is not reserved by other UE; and/or part or all of the resources on the time unit where the second resource is located.

Based on the above scheme, when the UE1 senses that the length of the other CPE is smaller than the first CPE, the UE1 may use part or all of the resources on the time unit where the reserved resources corresponding to the length of the other CPE are located as candidate resources, and in addition, may transmit according to the shorter length of the other CPE, so that blocking of transmission of other terminal devices can be avoided as much as possible, unnecessary waste of spectrum resources is reduced, and transmission efficiency of the terminal device is improved.

With reference to the second aspect, in some implementations of the second aspect, the first terminal device may further determine a third CPE length according to the subscription message, where the third CPE length corresponds to a third resource, and the third CPE length is smaller than the second CPE length, and the third resource and the second resource are located in a same time unit.

Alternatively, the second CPE length may be the longest CPE length corresponding to all reserved resources on the time unit.

Based on the above scheme, as long as the CPE lengths (e.g., the second CPE length and the third CPE length) are smaller than the first CPE length for a plurality of reserved resources on the same time unit, the UE1 may use the reserved resources corresponding to the second CPE length and the third CPE length as candidate resources.

With reference to the second aspect, in some implementations of the second aspect, the determining, by the first terminal device, a candidate resource set according to the first CPE length and the second CPE length includes: and under the condition that the length of the first CPE is equal to that of the second CPE and the received power RSRP of the reference signal of the reservation message is higher than a first threshold value, the first terminal equipment excludes the resources which are at least partially overlapped with the second resources, and a candidate resource set is obtained.

Based on the above scheme, when the UE1 senses that the length of other CPE is equal to the length of the first CPE, the RSRP limitation of the reservation message is further considered, so that the UE1 can use part or all of the resources on the time unit where the reserved resources corresponding to the length of other CPE are located as candidate resources, select the resources corresponding to the length of CPE with the same length as the first CPE to perform the first transmission, so that the transmission of the UE1 is prevented from being blocked by the transmission of other terminal devices, and meanwhile, the transmission of the UE1 is prevented from blocking the transmission of other terminal devices, the transmission efficiency of the terminal devices is improved, unnecessary waste of spectrum resources is avoided, and the transmission performance of the system is ensured.

With reference to the second aspect, in some implementations of the second aspect, the candidate resource set includes a first candidate resource subset, and/or a second candidate resource subset, where a second CPE length corresponding to a resource in the first candidate resource subset is equal to the first CPE length, and a second CPE length corresponding to a resource in the second candidate resource subset is less than the first CPE length.

Based on the above scheme, with the first CPE length as a reference, a first subset of resources to be selected, which is equal to the first CPE length, and a second subset of resources to be selected, which is shorter than the first CPE length, may be reported to the MAC layer separately or jointly as a subset of the candidate resource sets, so that the MAC layer may preferentially select the first candidate resource subset and/or the second candidate resource subset as the resources of the first transmission. The implementation mode can avoid the transmission of the UE1 from being blocked by the transmission of other terminal equipment, can avoid the transmission of the UE1 from blocking the transmission of other terminal equipment, improves the transmission efficiency of the terminal equipment, avoids unnecessary waste of spectrum resources, and ensures the transmission performance of the system.

With reference to the second aspect, in some implementations of the second aspect, the candidate resource set includes a third candidate resource subset, a second CPE length corresponding to a resource in the third candidate resource subset is equal to the first CPE length, and the resource in the third candidate resource subset is a resource on a first time unit, where the first time unit and the second resource are located, i.e. a resource on a time unit that is not reserved by other UEs.

Based on the scheme, resources on the time unit without reservation and the resources to be selected with the same length as the first CPE can be used as a single candidate resource subset in the candidate resource set and reported to the MAC layer, so that the MAC layer can preferentially select the third candidate resource subset as the resources of the first transmission, the transmission of the UE1 can be prevented from being blocked by the transmission of other terminal equipment, the transmission of the UE1 can be prevented from being blocked by the transmission of the other terminal equipment, the transmission efficiency of the terminal equipment is improved, the unnecessary waste of spectrum resources is avoided, and the transmission performance of the system is ensured.

With reference to the second aspect, in some implementations of the second aspect, in a case where the candidate set of resources fails to meet a requirement of the first transmission of the first terminal device, the first terminal device increases the first CPE length; the first terminal device determines a candidate resource set according to the first CPE length and the second CPE length, including: and the first terminal equipment determines a candidate resource set according to the increased first CPE length and the increased second CPE length.

With reference to the second aspect, in some implementations of the second aspect, the candidate resource set cannot meet a requirement of the first transmission of the first terminal device, including one or more of: the number of time units in which the candidate resources in the candidate resource set are located is lower than a second threshold; alternatively, the number of candidate resources in the set of candidate resources is below a third threshold.

Based on the above scheme, for the scenario that the candidate resource set cannot meet the requirement of the first transmission of the UE1, the first terminal device may increase the length of the first CPE to obtain more candidate resources for the first transmission, so as to ensure the transmission performance of the UE1 and avoid unnecessary waste of spectrum resources.

With reference to the second aspect, in some implementations of the second aspect, the second CPE length is determined according to a priority of a transmission corresponding to the second resource; alternatively, the second CPE length is determined based on the CPE length occupied by the subscription message

In a third aspect, there is provided a communication apparatus comprising: the receiving and transmitting unit is used for receiving a reservation message, and the reservation message indicates a second resource reserved by the second terminal equipment; the processing unit is used for determining a second cyclic prefix to expand the length of the CPE according to the reservation message, and the second CPE length corresponds to the second resource; the processing unit is further used for determining a third resource or adjusting the first CPE length according to the first CPE length and the second CPE length; the first CPE length is determined according to a priority of a first transmission of the first terminal device, the first CPE length corresponds to a first resource, the first resource is a resource that the first terminal device has selected for the first transmission, the first resource coincides with at least part of time domain resources of the second resource, and part or all of resources of the third resource are used for the first transmission by the first terminal device.

The transceiver unit may perform the processing of the reception and transmission in the foregoing first aspect, and the processing unit may perform other processing than the reception and transmission in the foregoing first aspect.

In a fourth aspect, there is provided a communication apparatus comprising: the receiving and transmitting unit is used for receiving a reservation message, and the reservation message indicates a second resource reserved by the second terminal equipment; the processing unit is used for determining a second cyclic prefix to expand the length of the CPE according to the reservation message, and the second CPE length corresponds to the second resource; and the processing unit is further used for determining 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 transmission by the first terminal equipment, and the first CPE length is determined according to the priority of the first transmission of the first terminal equipment.

The transceiver unit may perform the processing of the reception and transmission in the foregoing second aspect, and the processing unit may perform other processing than the reception and transmission in the foregoing second aspect.

In a fifth aspect, a communication method is provided, which may be performed by a first terminal device (e.g. UE 1) or may also be performed by a chip or circuit for the first terminal device, which is not limited in this application. For convenience of description, an example will be described below as being executed by the first terminal device.

The method comprises the following steps: the first terminal equipment receives a first reservation message, wherein the first reservation message indicates a second resource reserved by the second terminal equipment; the first terminal equipment determines a second cyclic prefix extension CPE starting point and a second transmission priority corresponding to a second resource according to the first reservation message, wherein the second CPE starting point corresponds to the second resource; the first terminal equipment determines a first CPE starting point or a third resource according to the priority of the second transmission, the second CPE starting point and the priority of the first transmission, wherein the first CPE starting point corresponds to a first resource, the first resource is a resource selected by the first terminal equipment for the first transmission, the first resource coincides with at least part of frequency domain resources of the second resource on the same time unit, and part or all of the resources of the third resource are used for the first terminal equipment to carry out the first transmission.

According to the scheme provided by the application, when the first terminal equipment senses that the second resource reserved by other terminal equipment is coincident with part of the frequency domain resource of the first resource selected by the first terminal equipment on the same time unit, the position of the first CPE starting point is determined by comparing the second CPE starting point, the priority of the second transmission and the priority of the first transmission, so that the transmission of the first terminal equipment is prevented from being blocked by the transmission of other terminal equipment (or the transmission of the first terminal equipment is prevented from being blocked by the transmission of other terminal equipment), the transmission efficiency is improved, and unnecessary waste of spectrum resources is avoided. The first CPE starting point used for the first transmission is redetermined by introducing the second CPE starting point and the priority of the second transmission in the process of reserving and re-evaluating the resources, so that the utilization rate of the spectrum resources is improved, and the transmission performance is guaranteed.

With reference to the fifth aspect, in some implementations of the fifth aspect, the determining, by the first terminal device, 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 includes: in case 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 start point is not later than the second CPE start point.

Based on the above scheme, in a case where the resource reserved for the other terminal device coincides with a part of the frequency domain resource of the first resource on 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 higher than or equal to the priority of the transmission of the other terminal device, the first terminal device determines that the first CPE start point is not later than the second CPE start point, or that the first CPE start point is earlier than or equal to the second CPE start point, or that the first CPE start point is an earlier one of the second CPE start point and CPE start point #1 (that is, the CPE start point determined for the first transmission by the first terminal device before determining the first CPE start point). The method can avoid the first transmission of the first terminal equipment from being blocked by the transmission of other terminal equipment, and ensure the user experience of the first terminal equipment. That is, this approach can ensure that high priority transmissions are not blocked by low priority transmissions.

With reference to the fifth aspect, in some implementations of the fifth aspect, the determining, by the first terminal device, 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 includes: in case 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.

Based on the above scheme, when the resources reserved for other terminal devices coincide with part of the frequency domain resources of the first resource on the same time unit (for example, time slot m), the first terminal device determines that the first CPE starting point is equal to the second CPE starting point, or that is, the positions of the first CPE starting point and the second CPE starting point are the same, by comparing the priority of the first transmission with the priority of the second transmission, that is, when the first transmission priority is equal to the transmission priority of the other terminal devices. The method can avoid the first transmission of the first terminal equipment from being blocked by the transmission of other terminal equipment, ensure the user experience of the first terminal equipment, or ensure that different terminal equipment with the same transmission priority are not blocked, namely, the first terminal equipment and the second terminal equipment can transmit simultaneously, thereby improving the frequency spectrum utilization rate.

With reference to the fifth aspect, in some implementations of the fifth aspect, the determining, by the first terminal device, 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 includes: in case 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 start point is not earlier than the second CPE start point.

Based on the above scheme, in a case where the resource reserved for the other terminal device coincides with a part of the frequency domain resource of the first resource on 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 priority of the transmission of the other terminal device, the first terminal device determines that the first CPE start point is not earlier than the second CPE start point, or that the first CPE start point is later than or equal to the second CPE start point, or that the first CPE start point is the later one of the second CPE start point and CPE start point #1 (that is, the CPE start point determined for the first transmission by the first terminal device before determining the first CPE start point). The method can avoid that the first transmission of the first terminal equipment does not block the transmission of other terminal equipment, and ensure the user experience of the second terminal equipment. That is, this approach can ensure that high priority transmissions are not blocked by low priority transmissions.

With reference to the fifth aspect, in some implementations of the fifth aspect, the determining, by the first terminal device, 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 includes: in case 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, wherein the third resource does not comprise the second resource.

Based on the above scheme, when the reserved resource of the other terminal device coincides with the partial frequency domain resource of the first resource on the same time unit (for example, time slot m), the first terminal device performs resource reselection 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 the other terminal device, so as to avoid that the first transmission of the first terminal device is blocked by the transmission of the other terminal device, and ensure user experience.

With reference to the fifth aspect, in some implementations of the fifth aspect, the first terminal device receives a second reservation message, where the second reservation message indicates a third resource reserved by the third terminal device, and the third resource coincides with at least a part of the frequency domain resources of the first resource on the same time unit; and the first terminal equipment determines a third CPE starting point and a third transmission priority corresponding to a third resource according to the second reservation message, wherein the third CPE starting point corresponds to the third resource.

The first terminal device determines a first CPE starting point or a 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 a first CPE starting point according to 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, wherein under the condition that the priority of the first transmission is higher than the priority of the second transmission and the priority of the first transmission is lower than the priority of the third transmission, the first terminal device determines that the first CPE starting point is a first preset CPE starting point or a second preset CPE starting point, and the second preset CPE starting point is one of a preset CPE starting point set.

Based on the above scheme, when the multiple resources reserved for multiple other terminal devices coincide with the partial frequency domain resources of the first resource on the same time unit (for example, time slot m), by comparing the priority of the second transmission, the priority of the second CPE starting point, the priority of the third transmission, the third CPE starting point and the priority of the first transmission, that is, when the priority of the first transmission is higher than the priority of the second transmission and the priority of the first transmission is lower than the priority of the third transmission, the first terminal device determines that the first CPE starting point is the first preset CPE starting point or the second preset CPE starting point, thereby avoiding that the first transmission of the first terminal device is blocked by the transmission of other terminal devices and/or avoiding that the transmission of other terminal devices is blocked by the transmission of the first terminal device, ensuring user experience and transmission performance, and improving user transmission efficiency and spectrum utilization.

With reference to the fifth aspect, in certain implementations of the fifth aspect, the first preset CPE start point and/or the set of preset CPE start points are preconfigured.

Illustratively, the first preset CPE start point is located in a symbol before the next AGC symbol, and the preset CPE start point set includes a second preset CPE start point, specifically, when a subcarrier spacing (SCS) is 15kHz, the second preset CPE start point is located in a symbol before the next AGC symbol; when the SCS is 30 or 60kHz, the second preset CPE start point is located within at most 2 symbols before the next AGC symbol.

With reference to the fifth aspect, in certain implementations of the fifth aspect, the first resource occupies all of the frequency domain resources of the one or more sets of resource blocks over the first time unit, and the second resource occupies a portion of the frequency domain resources of the one or more sets of resource blocks over the first time unit; wherein the second CPE start point is a first preset CPE start point.

Based on the above scheme, the first terminal device occupies all frequency domain resources (full RB set) of one or more resource block sets on the first time unit, the second terminal device occupies part of the frequency domain resources (partial RB set) of one or more resource block sets on the first time unit, and then the second CPE start point of the second transmission of the second terminal device can be considered as a first preset start point, that is, a preset default value, and the CPE start point #1 of the first transmission of the first terminal device is determined according to the priority (for example, cap or priority).

With reference to the fifth aspect, in certain implementations of the fifth aspect, the second preset CPE start point coincides with the first preset CPE start point, and the second preset CPE start point is one of a set of preset CPE start points; the first terminal device determines a first CPE start point or a third resource according to the priority of the second transmission and the second CPE start point, and the priority of the first CPE start point and the first transmission, including: and under the condition that the priority of the second transmission is higher than or equal to that of the first transmission, the first terminal equipment determines the first CPE starting point as a second preset CPE starting point.

Based on the above scheme, the first preset CPE starting point and the first preset CPE starting point overlap means that: the CPE start point is located one symbol before the next AGC symbol. When the resources reserved by other terminal devices coincide with the partial frequency domain resources of the first resources on the same time unit (for example, time slot m), the first terminal device determines that the first CPE start point is a second preset CPE start point by comparing the priority of the second transmission, the second CPE start point and the priority of the first transmission, that is, when the priority of the second transmission is higher than or equal to the priority of the first transmission, or the first CPE start point is the same as the first preset CPE start point at this time. The method can avoid the first transmission of the first terminal equipment from being blocked by the transmission of other terminal equipment, ensure the user experience and the transmission performance, and improve the user transmission efficiency and the spectrum utilization rate.

With reference to the fifth aspect, in certain implementations of the fifth aspect, the first resource occupies a portion of frequency domain resources of one or more resource block sets over the first time unit, and the second resource occupies all of the frequency domain resources of the one or more resource block sets over the first time unit; the second CPE start point is a second preset CPE start point, and the second preset CPE start point is one of the preset CPE start point sets.

Based on the above scheme, the second terminal device occupies all frequency domain resources (full RB set) of the one or more resource block sets on the first time unit, the first terminal device occupies part of the frequency domain resources (partial RB set) of the one or more resource block sets on the first time unit, so that the second CPE start point of the second transmission of the second terminal device may be considered as a second preset start point, and the CPE start point #1 of the first transmission of the first terminal device may be a preset default value.

With reference to the fifth aspect, in certain implementations of the fifth aspect, the second CPE start point is determined according to a second transmission priority or channel access priority CAPC, the second transmission priority or CAPC being determined according to the first subscription message; alternatively, the second CPE start point is determined from the CPE start point of the first subscription message.

Based on the above scheme, the first terminal device can determine the CPE starting point occupied by the transmission of each reservation message and the transmission priority of the reserved resource of each reservation message by receiving one or more reservation messages, and further determine the first CPE starting point according to the multiple CPE starting points and the corresponding transmission priority.

In a sixth aspect, there is provided a communication apparatus comprising: the receiving and transmitting unit is used for receiving a first reservation message, wherein the first reservation message indicates a second resource reserved by the second terminal equipment; the processing unit is used for determining a second CPE starting point and a second transmission priority corresponding to a second resource according to the first reservation message, wherein the second CPE starting point corresponds to the second resource; the processing unit is further configured to determine a first CPE start point according to the priority of the second transmission, the second CPE start point, and the priority of the first transmission, where the first CPE start point corresponds to a first resource, the first resource is a resource selected by the first terminal device for the first transmission, and the first resource coincides with at least a part of frequency domain resources of the second resource on the same time unit.

The transceiver unit may perform the processing of the reception and transmission in the fifth aspect, and the processing unit may perform other processing than the reception and transmission in the fifth aspect.

In a seventh aspect, a communication device is provided, comprising a transceiver, a processor for controlling the transceiver to transceive signals, and a memory for storing a computer program, the processor being adapted to invoke and run the computer program from the memory, such that the communication device performs the method in any of the possible implementations of the first or second or fifth aspects.

Optionally, the processor is one or more, and the memory is one or more.

Alternatively, the memory may be integrated with the processor or the memory may be separate from the processor.

Optionally, the communication device further comprises a transmitter (transmitter) and a receiver (receiver).

In an eighth aspect, a communication system is provided that includes a network device, a first terminal device, and at least one second terminal device.

In a seventh aspect, a computer readable storage medium is provided, the computer readable storage medium storing a computer program or code which, when run on a computer, causes the computer to perform the method of any one of the possible implementations of the first or second or fifth aspects.

In a ninth aspect, there is provided a chip comprising at least one processor coupled to a memory for storing a computer program, the processor being adapted to invoke and run the computer program from the memory, such that a device in which the chip system is installed performs the method of any of the possible implementations of the first or second or fifth aspects.

The chip may include an input circuit or interface for transmitting information or data, and an output circuit or interface for receiving information or data, among other things.

In a tenth aspect, there is provided a computer program product comprising: computer program code which, when run by an apparatus, causes the apparatus to perform the method of any one of the possible implementations of the first or second or fifth aspects described above.

Drawings

Fig. 1 and 2 are schematic diagrams of wireless communication systems suitable for use in embodiments of the present application.

Fig. 3 is a schematic diagram of resource selection performed by different terminal devices according to 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.

Fig. 5 is a schematic diagram of the results of the reservation void and reevaluation check provided in the embodiments of the present application.

Fig. 6 is a flow chart of a communication method 600 provided in an embodiment of the present application.

Fig. 7 to 9 are schematic diagrams of resource selection provided in an embodiment of the present application.

Fig. 10 is a schematic diagram of resource selection performed by different terminal devices according to an embodiment of the present application.

Fig. 11 is a flow chart illustrating a communication method 1100 according to an embodiment of the present application.

Fig. 12 to 13 are schematic diagrams of resource selection provided in the embodiments of the present application.

Fig. 14 is a schematic structural diagram of a communication device 1000 according to an embodiment of the present application.

Fig. 15 is a schematic structural diagram of a communication device 2000 according to an embodiment of the present application.

Fig. 16 is a schematic structural diagram of a chip system 3000 according to an embodiment of the present application.

Detailed Description

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

The technical scheme provided by the application can be applied to various communication systems, such as: fifth generation (5th generation,5G) or New Radio (NR) systems, long term evolution (long term evolution, LTE) systems, LTE frequency division duplex (frequency division duplex, FDD) systems, LTE time division duplex (time division duplex, TDD) systems, and the like. The technical scheme provided by the application can also be applied to future communication systems, such as a sixth generation (6th generation,6G) mobile communication system. The technical solutions provided herein may also be applied to device-to-device (D2D) communication, vehicle-to-everything (V2X) communication, machine-to-machine (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.

As an example, V2X communication may include: vehicle-to-vehicle (V2V) communication, vehicle-to-infrastructure (V2I) communication, vehicle-to-pedestrian (V2P) communication, vehicle-to-network (V2N) communication. V2V refers to communication between vehicles. V2P refers to vehicle-to-person communication including pedestrians, cyclists, drivers, or passengers, etc. V2I refers to the communication of a vehicle with an infrastructure, such as a Road Side Unit (RSU) or network device. Among them, RSUs include two types: the terminal type RSU is in a non-moving state because the terminal type RSU is distributed at the roadside, and mobility does not need to be considered; the base station type RSU may provide timing synchronization and resource scheduling for vehicles with which it communicates. V2N refers to the communication of the vehicle with the network device. It is to be understood that the foregoing is illustrative and that the embodiments of the present application are not limited. For example, V2X may also include Rel-16 of the current 3GPP and subsequent releases of NR system based V2X communications, and so on.

The terminal device in the embodiments of the present application may also be referred to as a User Equipment (UE), an access terminal, a subscriber unit, a subscriber station, a mobile station, a remote terminal, a mobile device, a user terminal, a wireless communication device, a user agent, or a user equipment.

The terminal device may be a device that provides voice/data to a user, e.g., a handheld device with wireless connection, an in-vehicle device, etc. Currently, some examples of terminals are: a mobile phone, tablet, laptop, palmtop, mobile internet device (mobile internet device, MID), wearable device, virtual Reality (VR) device, augmented reality (augmented reality, AR) device, wireless terminal in industrial control (industrial control), wireless terminal in unmanned (self driving), wireless terminal in teleoperation (remote medical surgery), wireless terminal in smart grid (smart grid), wireless terminal in transportation security (transportation safety), wireless terminal in smart city (smart city), wireless terminal in smart home (smart home), cellular phone, cordless phone, session initiation protocol (session initiation protocol, SIP) phone, wireless local loop (wireless local loop, WLL) station, personal digital assistant (personal digital assistant, PDA), handheld device with wireless communication function, computing device or other processing device connected to wireless modem, wearable device, terminal device in 5G network or terminal in future evolved land mobile communication network (public land mobile network), and the like, without limiting the present application.

By way of example, and not limitation, in embodiments of the present application, the terminal device may also be a wearable device. The wearable device can also be called as a wearable intelligent device, and is a generic name for intelligently designing daily wear by applying wearable technology and developing wearable devices, such as glasses, gloves, watches, clothes, shoes and the like. The wearable device is a portable device that is worn directly on the body or integrated into the clothing or accessories of the user. The wearable device is not only a hardware device, but also can realize a powerful function through software support, data interaction and cloud interaction. The generalized wearable intelligent device includes full functionality, large size, and may not rely on the smart phone to implement complete or partial functionality, such as: smart watches or smart glasses, etc., and focus on only certain types of application functions, and need to be used in combination with other devices, such as smart phones, for example, various smart bracelets, smart jewelry, etc. for physical sign monitoring.

In the embodiment of the present application, the device for implementing the function of the terminal device, that is, the terminal device, may be the terminal device, or may be a device capable of supporting the terminal device to implement the function, for example, a chip system or a chip, and the device may be installed in the terminal device. In the embodiment of the application, the chip system may be formed by a chip, and may also include a chip and other discrete devices.

The network device in the embodiments of the present application may be a device for communicating with a terminal device, which may also be referred to as an access network device or a radio access network device, e.g. the network device may be a base station. The network device in the embodiments of the present application may refer to a radio access network (radio access network, RAN) node (or device) that accesses the terminal device to the wireless network. The base station may broadly cover or replace various names in the following, such as: a node B (NodeB), an evolved NodeB (eNB), a next generation NodeB (gNB), a relay station, an access point, a transmission point (transmitting and receiving point, TRP), a transmission point (transmitting point, TP), a master station, a secondary station, a multi-mode radio (motor slide retainer, MSR) node, a home base station, a network controller, an access node, a radio node, an Access Point (AP), a transmission node, a transceiver node, a baseband unit (BBU), a remote radio unit (remote radio unit, RRU), an active antenna unit (active antenna unit, AAU), a radio head (remote radio head, RRH), a Central Unit (CU), a Distributed Unit (DU), a positioning node, and the like. 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 for placement within the aforementioned device or apparatus. The base station may be a mobile switching center, a device that performs a base station function in D2D, V2X, M M communication, a network side device in a 6G network, a device that performs a base station function in a future communication system, or the like. The base stations may support networks of the same or different access technologies. The embodiment of the application does not limit the specific technology and the specific device form adopted by the network device.

The base station may be fixed or mobile. For example, a helicopter or drone may be configured to act as a mobile base station, and one or more cells may move according to the location of the mobile base station. In other examples, a helicopter or drone may be configured to function as a device to communicate with another base station.

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

In the embodiment of the present application, the means for implementing the function of the network device may be the network device, or may be a means capable of supporting the network device to implement the function, for example, a chip system or a chip, and the means may be installed in the network device. In the embodiment of the application, the chip system may be formed by a chip, and may also include a chip and other discrete devices.

Network devices and terminal devices may be deployed on land, including indoors or outdoors, hand-held or vehicle-mounted; the device can be deployed on the water surface; but also on aerial planes, balloons and satellites. In the embodiment of the application, the scene where the network device and the terminal device are located is not limited.

It should be noted that, the technical solution of the present application is mainly applied to a side-line transmission scenario, and the used frequency bands include, but are not limited to, unlicensed spectrum, where unlicensed spectrum includes a frequency band around 2.4GHz, a frequency band around 5.8GHz, and so on. In the embodiment of the application, the terminal device and the access network device can use unlicensed spectrum resources to perform wireless communication (for example, transmit uplink information or transmit downlink information). The communication system may employ licensed-assisted access (LAA), dual connectivity (dual connectivity, DC), unlicensed assisted access (stand alone) techniques, and the like.

A communication system suitable for use in embodiments of the present application is briefly described below in conjunction with fig. 1 and 2.

Fig. 1 and 2 are schematic diagrams of wireless communication systems suitable for use in embodiments of the present application. As shown in fig. 1 and 2, the wireless communication system may include at least one terminal device, UE1, UE2, UE3, UE4, UE5 as shown. Optionally, the wireless communication system may further comprise at least one network device, as shown.

Communication may be performed between the network device and the terminal device. For example, the network device and the terminal device may communicate via a Uu interface, and a link (link) between the network device and the terminal device may be referred to as a Uu link. As shown in fig. 1 (a) or fig. 2 (a), the network device and the UE1 may directly communicate, as shown in fig. 1 (b) or fig. 2 (b), and the network device and the UE1 may also communicate through the UE 2; similarly, the network device and the UE2 may communicate directly, and the network device and the UE2 may also communicate through the UE 1. It will be appreciated that, where the Uu link characterizes a connection between the terminal equipment and the network equipment, it is a logical concept, not a physical entity. The primary link is just a name for distinction, and its specific name does not limit the scope of protection of the present application.

Communication may also take place between the terminal device and the terminal device. For example, the terminal device and the terminal device may communicate directly, and as shown in fig. 1 (a) to 1 (c) and fig. 2 (a) to 2 (c), the UE1 and the UE2 may communicate directly. As another example, the terminal device and the terminal device may communicate with each other through other devices, such as a network device or a terminal device, as shown in fig. 1 (a), and the UE1 and the UE2 may communicate with each other through a network device, as shown in fig. 1 (d), and as shown in fig. 2 (d), and the UE1 and the UE2 may communicate with each other through the UE 3. The interface for communication between the terminal device and the terminal device may be referred to as a proximity-based service communication 5 (proximity-based services communication, pc 5) interface, the communication between the terminal device and the terminal device may be referred to as a Sidelink (SL), and the communication between the terminal device and the terminal device may be referred to as a SL communication. The sidelink, which may also be referred to as a side link or a sidelink, etc. It will be appreciated that, where the side-link characterizes a connection between a terminal device and a terminal device, it is a logical concept rather than a physical entity. The side links are only names made for distinction, and their specific names do not limit the scope of the present application.

Unicast communication can be performed between devices, such as between terminal devices. Unicast refers to: a transmitting terminal and a receiving terminal form a unicast connection pair. For example, taking fig. 1 as an example, unicast communication may be performed between UE1 and UE 2.

Multicast communication can be performed between devices, such as between terminal devices. Multicast refers to: a transmitting terminal and at least one receiving terminal form a multicast connection pair. For example, taking fig. 2 as an example, multicast communication may be performed between UE1 and UE2, UE4, and UE 5. As shown in fig. 2 (a), the network device and the UE1 may communicate directly, and one UE1 may communicate with a plurality of UEs, such as UE2, UE4, and UE5, in a multicast manner. When multicast communication is performed between the UE1 and a plurality of UEs, the multicast communication may be performed under network coverage as shown in fig. 2 (a) or fig. 2 (b), or may be performed without network coverage as shown in fig. 2 (c) or fig. 2 (d). It will be appreciated that in fig. 2, multicast communication between UE1 and three UEs is illustrated as an example, and this is not limiting, e.g. UE1 may communicate multicast with a greater number of UEs.

As an example, the SL communication between the terminal device and the terminal device may be used in a car networking or intelligent transportation system (intelligent transportation system, ITS), such as the V2X communication described above.

Alternatively, the SL communication between the terminal device and the terminal device may be performed under network coverage or may be performed without network coverage. As shown in fig. 1 (a) to 1 (b) and fig. 2 (a) to 2 (b), communication between the UE1 and other UEs may be performed under network coverage; alternatively, as shown in fig. 1 (c) to 1 (d) and fig. 2 (c) to 2 (d), communication between the UE1 and other UEs may be performed outside the network coverage (out-of-coverage).

Optionally, the configuration information during SL communication between the terminal device and the terminal device, such as time-frequency resources during SL communication between the terminal device and the terminal device, may be configured or scheduled by the network device, or may be selected by the terminal device independently, without limitation.

It will be appreciated that fig. 1 and 2 are simplified schematic diagrams illustrating only for ease of understanding, and that other network devices or other terminal devices may be included in the wireless communication system, which are not shown in fig. 1 and 2. The embodiment of the application can be applied to any communication scene of communication between the sending end equipment and the receiving end equipment.

Note that, the embodiment of the present application is not particularly limited to the specific structure of the execution body of the method provided in the embodiment of the present application, as long as the communication can be performed by the method provided in accordance with the embodiment of the present application by running the program recorded with the code of the method provided in the embodiment of the present application, and for example, the execution body of the method provided in the embodiment of the present application may be a terminal device, or a functional module in the terminal device that is capable of calling the program and executing the program.

To facilitate an understanding of the embodiments of the present application, a brief description of terms or techniques referred to in this application will first be provided.

1. Licensed spectrum and unlicensed spectrum

The spectrum used by wireless communication systems is divided into two categories, licensed spectrum (licensed spectrum) and unlicensed spectrum (unlicensed spectrum). In licensed spectrum, the UE may use spectrum resources based on the scheduling of the network device. In unlicensed spectrum, a communication device may use spectrum resources in a competing manner. SL communication over unlicensed spectrum may be referred to as SL-U, and NR cellular communication over unlicensed spectrum may be referred to as NR-U.

One possible approach is for the communication device to contend for the channel by listen-before-talk (LBT) to use unlicensed spectrum resources.

2. Unlicensed spectrum side-links (sidleink unlicense, SL-U)

SL-U mainly refers to SL transmissions in unlicensed spectrum (unlicensed band). For unlicensed spectrum, the standard introduces two access mechanisms including Type 1 and Type 2. Wherein, type 1 is used for preempting the scene of the channel, and LBT needs to be performed, i.e. listening is needed before transmission. The listening here may be energy detection, i.e. detecting energy over 9 mus, if exceeding the threshold indicates that there is a UE occupying the resource; otherwise, if the threshold is not exceeded, it means that no UE occupies the resource. Type 2 is used for sharing transmission resources preempted by other UEs in a Type 1 manner. For example, UE1 may preempt a transmission opportunity (i.e., channel occupation time (channel occupancy time, COT)) with Type 1 for a period of time, and may instruct other UEs to access the remaining transmission opportunities in the COT occupied by UE1 in Type 2, in addition to the transmission time occupied by itself.

It should be noted that, type2 further includes Type2A and Type 2b, and Type2A indicates that the channel is occupied after an interval of 25 μs after the transmission of other UEs ends, that is, the channel may be occupied when no other UE uses in 25 μs through sensing the channel. Type 2B indicates that the channel is occupied after an interval of 16 mus after the transmission of other UEs is completed, and is different from Type2A in 9 mus, i.e., the duration of one perceived slot.

For unlicensed spectrum, the UE must perform LBT on each 20MHz channel, which may be referred to as an LBT channel, before transmission. To avoid interference of different channels, the UE cannot transmit data over the entire 20MHz bandwidth, but leaves a part of the frequency band resources as guard band (guard band), and only transmits data over the remaining part of the frequency band resources, which part of the available resources is called a resource block set (resource block set, RB set). When the UE performs LBT operation on a continuous plurality of 20MHz channels and successfully accesses the channels, a guard bandwidth between two RBs sets may be used to transmit data, improving resource utilization.

It should be appreciated that whether the channel is idle is determined by energy detection, whether it is Type 1LBT or Type2 LBT. If the resources corresponding to two transmission blocks are relatively close in time domain and belong to the same channel in frequency, the transmission block with the front in time may fail the transmission block LBT with the rear in time, so that the transmission block cannot be transmitted. This phenomenon, which may be referred to herein as inter-UE blocking (inter-UE blocking), will result in UE transmission failure.

3. SL resource pool (resource pool)

In NR, SL transmission is based on a resource pool. Each resource pool contains one or more sub-channels (sub-channels), the frequency domain resources (i.e. the number of physical resource blocks (physical resource block, PRBs)) occupied by the sub-channels in the same resource pool are the same, and the frequency domain resources occupied by the sub-channels in different resource pools may be different.

It should be appreciated that a resource pool is a logical concept, and a resource pool includes a plurality of physical resources, any of which are used to transmit data. Each UE needs to select one resource from the resource pool when transmitting data. This resource selection procedure includes the following two cases:

(1) The UE is controlled by the network equipment, and selects one resource from the resource pool to perform data transmission according to the indication information of the network equipment, which is also called as a Mode 1 Mode;

(2) The UE autonomously selects one resource from the resource pool for data transmission, which is also called Mode2, i.e. the UE has an opportunity to autonomously decide on the selection and allocation of the resource. The UE may exclude some occupied or more interfering resources according to the occupation situation of the perceived spectrum, and select transmission resources on idle or less interfering resources.

The resource pool includes at least one LBT channel. For example, the resource pool includes one LBT channel, the channel bandwidth is 20MHz, and the resource pool bandwidth is 20MHz. For another example, the resource pool includes 2 LBT channels, the channel bandwidth is 20MHz, and the resource pool bandwidth is 40MHz. For another example, the resource pool includes 5 LBT channels, the channel bandwidth is 20MHz, and the resource pool bandwidth is 100MHz.

4. CPE length

It should be appreciated that the priorities of the different transmissions (e.g., channel access priorities (channel access priority class, caps) or priorities) correspond to different CPE lengths, the smaller the priority (smaller the value of cap or priority), the longer the corresponding CPE length. The SL-U acts as a synchronous system and can only be accessed at a designated location. Therefore, in order to better occupy the channel, the UE may send CPE to preempt the channel before accessing the channel, and the specific preemption time is related to the cap value, which may be specified according to the standard, or may be implemented inside the UE.

5. Time domain unit and frequency domain unit

The data or information may be carried by time-frequency resources.

In the time domain, a time-frequency resource may comprise one or more time-domain units (or, alternatively, may be referred to as time units). A time domain unit may be a symbol, or a mini-slot, or a partial slot, or a subframe, or a radio frame, etc.

In the frequency domain, the time-frequency resource may include one or more frequency domain units. A frequency domain unit may be a Resource Element (RE), or a Resource Block (RB), or a sub-channel (sub-channel), or a resource pool (resource pool), or a bandwidth part (BWP), or a carrier, or a channel, or an interlace (RB), etc.

6. Priority level

The UE may have transmitted multiple services at the same time, and the priorities of the multiple services may be different. Thus, the priority of a UE may also be described as the traffic priority of the UE. The traffic priority of the UE is specifically the transmission priority of the UE (transmission priority). Traffic priority, which may also be referred to as L1 priority (L1 priority), physical layer priority, priority carried in the side uplink control information (sidelink control information, SCI), priority corresponding to the physical side shared channel (physical side link share channel, PSSCH) to which the SCI is associated, transmission priority, priority of transmitting the PSSCH, priority for resource selection, priority of the logical channel, and highest-level priority of the logical channel. The priority levels and the priority values may have some corresponding relationship, for example, the higher the priority level, the lower the corresponding priority value, or the lower the priority level, the lower the corresponding priority value. Taking the example that the priority value corresponding to the higher priority level is lower, the range of the priority value can be an integer of 1-8 or an integer of 0-7. If the range of the priority value is 1-8, the priority value is 1, which represents the highest priority.

7. Channel access priority CAPC

The priority levels may have some correspondence with priority values, e.g. a higher priority level corresponds to a lower priority value or a lower priority level corresponds to a lower priority value. The priority value can be 1-4, and the smaller the value, the higher the priority.

When Type 1 transmission is performed, the UE decides the duration of LBT according to different priorities, as described in Table 4.2.1-1 of TS 37.213, when the cap priority is 1, the maximum COT is 2ms, when the cap priority is 2, the maximum COT duration is 4ms, and when the cap priority is 3 or 4, the maximum COT duration is 6ms or 10ms.

The terms referred to in the present application are briefly described above, and will not be repeated in the following examples. Furthermore, the foregoing descriptions of the terms are provided for the purpose of illustration only, and are not intended to limit the scope of the embodiments of the present application.

In a Mode 2 scenario SL communication system, a terminal device autonomously performs resource awareness and resource selection (or reservation) to determine the time-frequency resources occupied by a transmission. The method for the UE to perform resource awareness and resource selection may include the following steps:

step 1: the UE perceives resources within a resource awareness window, or resource awareness, by decoding a physical sidelink control channel (physical sidelink control channel, PSCCH) and measuring RSRP values.

Step 2: and the UE judges whether to exclude the resources from the resource selection window or not by comparing the RSRP threshold and the RSRP measured value according to the sensing result of the resources in the resource sensing window, thereby forming a candidate resource set. For example, in the resource awareness window, if the RSRP measurement value of the resource 1 is higher than the RSRP threshold, the resource falling in the resource selection window is excluded from the reserved resources indicated by SCI in the resource 1. Otherwise, the resources of the reserved resources indicated by SCI in resource 1 that fall within the resource selection window are not excluded. Wherein the RSRP threshold is related to the traffic priority indicated by the SCI and the traffic priority of the UE itself. A reserved resource may be understood as a resource that is pre-designated or occupied by a certain UE (e.g., UE # 1) for subsequent transmission of information by the UE #1, so that other UEs (e.g., UE # 2) may exclude the reserved resource from the resource selection window of the UE #2 according to the resource awareness result.

After the end of the resource exclusion, the physical layer will examine whether the number of remaining available resources is greater than or equal to m×x, where M is the number of all resources in the resource selection window and X% is a predetermined percentage, such as 20%, 35%, 50%, etc. If the number of the remaining available resources is less than M X, raising the RSRP threshold by 3dB, and repeating the process until the number of the 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, which randomly selects the transmitted resources among the available resources. Wherein the remaining available resources in the resource selection window may be understood as a candidate set of resources.

Step 3: the UE selects resources available for transmitting SL information from the candidate resource set, wherein the SL information transmitted by the UE comprises initial transmission information and a plurality of retransmission information.

Step 4: when a certain condition is met, for example, the reserved resources of the UE coincide with reserved resources of other UEs, the UE triggers a resource reselection.

Fig. 3 is a schematic diagram of resource selection performed by different terminal devices according to an embodiment of the present application. As shown in fig. 3 (a), on the same timeslot, the resource #2 reserved by the UE-x coincides with the resource #1 selected by the UE-1, the length of the CPE #2 corresponding to the resource #2 reserved by the UE-x is greater than the length of the CPE #1 corresponding to the resource #1 reserved by the UE-1, and then other sub channels on the RB set (e.g., 20 MHz) are not available, and the transmission of the UE-1 may be affected by inter-UE blocking of the UE-x. As shown in fig. 3 (b), on the same timeslot, the resource #2 reserved by the UE-x coincides with the resource #1 selected by the UE-1, the length of the CPE #2 corresponding to the resource #2 reserved by the UE-x is smaller than the length of the CPE #1 corresponding to the resource #1 reserved by the UE-1, and if the UE1 continues to transmit on the timeslot, the transmission of the UE1 affects the service transmission of the UE-x in the RB set (e.g., 20 MHz), that is, the transmission of the UE-x is affected by the inter-UE blocking of the UE-1.

Currently, in an SL-U communication system, the influence of the CPE length on transmission is not considered in the resource selection process, so that the resource selected by the terminal device may be blocked by the transmission of the adjacent frequency, or the transmission of the adjacent frequency is blocked, and the service experience and the transmission performance of the user are reduced.

In view of this, the present application provides a communication method and apparatus, by comparing CPE lengths corresponding to different reserved resources according to a perceived reservation message at the time of reservation empty and reevaluation check, so as to determine whether to perform resource reselection (i.e. update a condition for resource reselection according to the CPE length), or adjust a first CPE length used for transmission. The method can prevent the resources selected by different terminal equipment from collision aiming at the situation that different terminal equipment reserves the same resource, ensure the transmission efficiency of the terminal equipment, improve the utilization rate of frequency spectrum and ensure the service transmission and experience of users.

To facilitate an understanding of the embodiments of the present application, the following description is made:

first, in the present application, terms and/or descriptions between different embodiments have consistency and may refer to each other, and technical features in different embodiments may be combined to form new embodiments according to their inherent logical relationship, if not specifically stated and logic conflict.

Second, in the present application, "at least one" means one or more, and "a plurality" means two or more. "and/or", describes an association relationship of an association object, and indicates that there may be three relationships, for example, a and/or B, and may indicate: a alone, a and B together, and B alone, wherein a, B may be singular or plural. In the text description of the present application, the character "/" generally indicates that the front-rear association object is an or relationship. "at least one of" or the like means any combination of these items, including any combination of single item(s) or plural items(s). For example, at least one (one) of a, b, and c may represent: a, or b, or c, or a and b, or a and c, or b and c, or a, b and c. Wherein a, b and c can be single or multiple respectively.

Third, in the present application, "first", "second", and various numerical numbers (e.g., #1, #2, etc.) indicate distinction for convenience of description, and are not intended to limit the scope of the embodiments of the present application. For example, distinguishing between different messages, etc. does not require a particular order or sequence of parts. It is to be understood that the objects so described may be interchanged where appropriate to enable description of aspects other than those of the embodiments of the application.

Fourth, in this application, descriptions of "when … …", "in the case of … …", and "if" etc. all refer to a device making a corresponding process under some objective condition, and are not intended to limit the time, nor do the device require a judgment in terms of implementation, nor are other limitations meant to be implied.

Fifth, in this application, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed or inherent to such process, method, article, or apparatus.

Sixth, in the present application, "for indicating" may include for direct indication and for indirect indication. When describing that certain indication information is used for indicating A, the indication information may be included to directly indicate A or indirectly indicate A, and does not represent that the indication information is necessarily carried with A.

The indication manner referred to in the embodiments of the present application should be understood to cover various methods that may enable the party to be indicated to learn the information to be indicated. The information to be indicated may be sent together as a whole, or may be divided into a plurality of sub-information to be sent separately, and the sending periods and/or sending timings of the sub-information may be the same or different, which is not limited to a specific sending method in the present application.

The "indication information" in the embodiments of the present application may be an explicit indication, that is, directly indicated by signaling, or obtained according to parameters indicated by signaling, in combination with other rules or in combination with other parameters, or by deduction. Or may be implicitly indicated, i.e. obtained according to rules or relationships, or according to other parameters, or derived. The present application is not particularly limited thereto.

Seventh, in the present application, "protocol" may refer to a standard protocol in the field of communications, and may include, for example, a 5G protocol, a New Radio (NR) protocol, and related protocols applied in future communication systems, which are not limited in this application. "preconfiguration" may include predefined. For example, a protocol definition. The "pre-defining" may be implemented by pre-storing corresponding codes, tables or other manners that may be used to indicate relevant information in the device, and the application is not limited to a specific implementation manner.

Eighth, in this application, "store" may refer to being held in one or more memories. The one or more memories may be provided separately or may be integrated in an encoder or decoder, processor, or communication device. The one or more memories may also be provided separately in part, and integrated in the decoder, processor, or communication device. The type of memory may be any form of storage medium, and this application is not limited in this regard.

Ninth, in the present application, "communication" may also be described as "data transmission", "information transmission", "data processing", and the like. "transmitting" includes "transmitting" and "receiving," as not limited in this application.

Tenth, in the present application, "first terminal device" may be described as "UE1", and "second terminal device" may be described as "UE2", and so on, which are not particularly emphasized herein.

The communication method provided in the embodiment of the present application will be described in detail below with reference to the accompanying drawings. The embodiments provided herein may be applicable to any communication scenario in which a transmitting end device and a receiving end device communicate, for example, may be applied to the communication systems shown in fig. 1 and 2 described above.

Fig. 4 is a flow chart of a communication method 400 provided in an embodiment of the present application. As shown in fig. 4, the method includes the following steps.

S410, the first terminal device receives the reservation message.

Wherein the reservation message indicates a second resource reserved by the second terminal device.

Optionally, the first terminal device receives the reservation message, which may be that the first terminal device receives the reservation message from the second terminal device, or may also be that the first terminal device receives the reservation message from the network device, that is, the reservation message is forwarded to the first terminal device by the network device, which is not limited in the manner of acquiring the reservation message by the first terminal device.

Illustratively, UE1 perceives, listens for, or receives a reservation message sent by UE 2. The reservation message of UE2 may indicate, either explicitly or implicitly, the second resource reserved by UE 2. Wherein the second resource includes, but is not limited to: reservation interval information, frequency domain resource information, time domain resource information, and priority information. Specifically, the reservation interval information may be periodic reservation interval information; the frequency domain resource information is used for indicating the reserved frequency domain resource position, and comprises the following steps: information such as the starting frequency domain location and the size of occupied frequency domain resources, for example, the frequency domain resource information includes one or more of the following information: transmitting PSCCH and/or PSSCH in an interleaved manner, starting position of the interleaving, number of interleaving, and transmitting PSCCH and/or PSSCH in a non-interleaved (e.g., sub-channel) manner; the time domain resource information is used to indicate the time domain resource location of the reservation, e.g., the time domain resource information includes one or more of the following information: transmitting one or more primary transmissions and/or retransmissions over a plurality of time slots, time interval information for one or more primary transmissions and/or retransmissions, number of primary transmissions and/or retransmissions over consecutive time slots; the priority information includes priority, CAPC, or the like.

The number of reservation messages and the number of terminal devices transmitting the reservation messages are not particularly limited in the present application. I.e. the subscription message may be one or more. When there are a plurality of reservation messages, the plurality of reservation messages may be sent by the same terminal device, and are used for indicating a plurality of resources reserved by the terminal device; alternatively, the plurality of reservation messages may be sent by different terminal devices, for indicating the resources reserved by each terminal device, and the like.

S420, the first terminal equipment determines the length of the second CPE according to the reservation message.

Wherein the second CPE length corresponds to the second resource.

Optionally, the first terminal device determines the second CPE length according to the reservation message, and may determine the second CPE length according to the priority of the transmission corresponding to the second resource; or, the first terminal device may determine the second CPE length according to the CPE length occupied by the subscription message. It should be noted that, the priority of the transmission here includes, but is not limited to: priority or CAPC.

It should be appreciated that in order to better occupy the channel, the terminal device may send a CPE to preempt the channel before accessing the channel, and the specific length of time that preemption may be related to the cap value and/or the value of the physical layer priority, may be specified according to a standard, or may be implemented internally by the first terminal device. The second CPE length corresponds to the second resource, which can be understood as 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.

By way of example, time units in this application may include, but are not limited to: time slots, symbols, or minislots, etc., represent the length of a transmission (or, alternatively, the transmission duration), e.g., 1ms. In the following, in order to facilitate understanding of the technical solution, a time slot is taken as an example of a time unit, and a communication method of the present application will be described.

S430, the first terminal equipment determines a 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 a priority of a first transmission of the first terminal device, the first CPE length corresponds to a first resource, the first resource is a resource that the first terminal device has selected for the first transmission, the first resource coincides with at least part of time domain resources of the second resource, and part or all of resources of the third resource are used for the first transmission by the first terminal device.

It should be appreciated that the priorities (caps or priorities) of the different transmissions correspond to different CPE lengths. For example, a first transmission of a first terminal device corresponds to a first CPE length and a second transmission of a second terminal device corresponds to a second CPE length. The first CPE length corresponds to the first resource, which 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.

It should be noted that, since the first resource coincides with at least a part of the time domain resource of the second resource, such as the time slot m, the first CPE length and the second CPE length (located on the time slot m-1) 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 cannot pass, and thus the transmission of the first terminal device is blocked, so the first terminal device may exclude the resource on the time slot m, and the determination of the third resource exists.

In this application, the third resource in the physical layer protocol actually refers to a candidate resource for the first terminal device to perform the first transmission, where the first terminal device needs to report to the MAC layer, and further performs resource selection in the MAC layer, that is, selects part or all of the third resource for the first terminal device to perform the first transmission.

Next, under the condition that at least part of the frequency domain resources of the first resource and the second resource are overlapped, comparing CPE lengths corresponding to reserved resources according to different application scenarios, and describing a specific implementation manner of determining the third resource by the first terminal device in detail.

In one possible implementation, the first terminal device determines the third resource in case the first CPE length is smaller than the second CPE length.

For example, the first resource selected by the UE1 is located in a time slot m, the UE1 performs a reserved space and reevaluation check at the m-T3 time, and senses that the second resource reserved by the UE2 is also located in the time slot m, and it is assumed that the first resource and the second resource are located in the same RB set, and the bandwidth of the RB set may be 20MHz, a certain preset value, or a certain configuration value. For example, the RB set includes 4 subchannels, and the bandwidth of each subchannel is 5MHz. If the second CPE length corresponding to the second resource is greater than the first CPE length corresponding to the first resource, the transmission of UE1 will be affected by inter-UE blocking of UE2, and if UE1 continues to occupy the slot m, LBT will not pass when the first CPE length is used to preempt the channel, so UE1 needs to trigger resource reselection to obtain a third resource. For example, UE1 does not use the first resource on this slot m for the first transmission. It should be appreciated that since the first CPE length is smaller than the second CPE length, the RSRP limitation of the reservation message need not be considered by UE1 in this manner.

The reserved empty and reevaluation checking scenario may refer to existing standards, for example, in the case that 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 in case the priority of the first transmission of the first terminal device is below a certain priority threshold and the priority of the transmission of the second terminal device is above the priority threshold.

Alternatively, the first CPE length may be the longest CPE length corresponding to all reserved resources on the time slot m perceived by the UE1, that is, the first CPE length corresponds to the highest priority transmission on the time slot m.

It should be appreciated that the implementation is not particularly limited as to whether the frequency domain resources on the time domain resources coincide.

In another possible implementation, the first terminal device determines the third resource in case the first CPE length is smaller than the second CPE length and the first resource coincides with at least part of the frequency domain resources of the second resource.

For example, the first resource selected by the UE1 is located in a time slot m, the UE1 performs a reserved space and reevaluation check at the m-T3 time, and senses that the second resource reserved by the UE2 is also located in the time slot m, and it is assumed that the first resource and the second resource are located in the same RB set, and the bandwidth of the RB set may be 20MHz, a certain preset value, or a certain configuration value. For example, the RB set includes 4 sub-channels, and each sub-channel has a bandwidth of 5MHz, the frequency domain resource of the first resource corresponds to sub-channel 0 and sub-channel 1, and the second resource corresponds to sub-channel 1 and sub-channel 2. If the second CPE length corresponding to the second resource reserved by the UE2 in the time slot m is greater than the first CPE length corresponding to the first resource selected by the UE1, the transmission of the UE1 will be affected by inter-UE blocking of the UE2, and if the UE1 continues to occupy the time slot m, LBT will not pass when the first CPE length is used to preempt the channel, so that the UE1 needs to trigger resource reselection to obtain the third resource. For example, UE1 does not use the first resource on this slot m for the first transmission. The first resource has a frequency domain resource (e.g., subchannel 1) that partially coincides with the second resource. It should be appreciated that since the first CPE length is smaller than the second CPE length, the RSRP limitation of the reservation message need not be considered by UE1 in this manner.

In yet another possible implementation, the first terminal device determines the third resource in case the first CPE length is equal to the second CPE length, the first resource coincides with at least part of the frequency domain resources of the second resource, and the received power RSRP of the reference signal of the reservation message is higher than a first threshold.

For example, the first resource selected by the UE1 is located in a time slot m, the UE1 performs a reserved space and reevaluation check at the m-T3 time, and senses that the second resource reserved by the UE2 is also located in the time slot m, and it is assumed that the first resource and the second resource are located in the same RB set, and the bandwidth of the RB set may 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 the time slot m is equal to the first CPE length corresponding to the first resource selected by UE1, UE1 and UE2 can simultaneously use the resources in the time slot m for transmission without blocking each other. Further, if the first resource and the second resource overlap with each other partially or completely, the RSRP of the reservation message of the UE2 is greater than the first threshold, and the UE1 needs to trigger the resource reselection to obtain the third resource. For example, UE1 does not use the first resource on this slot m for the first transmission.

Next, under the condition that at least part of the frequency domain resources of the first resource and the second resource are overlapped, comparing CPE lengths corresponding to reserved resources according to different application scenes, and describing a specific implementation manner of adjusting the first CPE length by the first terminal device in detail.

In one possible implementation, the first terminal device adjusts, according to the first CPE length and the second CPE length, the first CPE length of the first terminal device on a first time unit to be a third CPE length, where the first time unit is a time domain resource of a superposition portion of the first resource and the second resource, and the third CPE length is greater than or equal to the second CPE length.

It should be appreciated that the first resource and the second resource in this implementation do not overlap in the frequency domain. The first terminal device adjusting the first CPE length on the first time unit refers to the first terminal device adjusting the first CPE length corresponding to the first resource reserved on the first time unit, where the first CPE length is transmitted on the gap symbol of the previous time slot of the first time unit.

For example, the first resource selected by UE1 is located in a time slot m (i.e., a first time unit), and UE1 performs a reservation empty and re-evaluation check at m-T3, and perceives that the second resource reserved by UE2 is also located in the time slot m, and the bandwidth of the RB set may be 20MHz, a certain preset value, or a certain configuration value, assuming that the first resource and the second resource are located in the same RB set. If the second CPE length corresponding to the second resource reserved by the UE2 in the time slot m is greater than the first CPE length corresponding to the first resource selected by the UE1, the transmission of the UE1 will be affected by the inter-UE blocking of the UE2, and if the UE1 continues to occupy the time slot m, the LBT will not pass when the channel is preempted using the first CPE length, so that the UE1 needs to increase the first CPE length to be the third CPE length, so as to ensure that the UE1 can perform the first transmission in the time slot m.

Optionally, the third CPE length is greater than the second CPE length, and if UE1 perceives that only one UE (e.g., UE 2) reserves the resources on the time slot m for transmission, UE1 may make the first transmission on the time slot m, but may cause blocking of the transmission of UE 2.

Optionally, if the third CPE length is equal to the second CPE length and the UE1 senses that only one UE (e.g. UE 2) reserves the resource on the time slot m for transmission, the UE1 and the UE2 can simultaneously transmit on the time slot m, so that transmission blocking is not caused, the transmission efficiency of the user is ensured, and the spectrum utilization rate is improved.

For example, the first resource selected by UE1 is located in a time slot m (i.e., a first time unit), and UE1 performs a reservation empty and re-evaluation check at m-T3, and perceives that the second resource reserved by UE2 is also located in the time slot m, and the bandwidth of the RB set may be 20MHz, a certain preset value, or a certain configuration value, assuming that the first resource and the second resource are located in the same RB set. If the second CPE length corresponding to the second resource reserved by the UE2 in the time slot m is smaller than the first CPE length corresponding to the first resource selected by the UE1, the transmission of the UE2 may be affected by inter-UE blocking of the UE1, and at this time, the UE1 may continue to occupy the resource in the time slot m to perform the first transmission, and the first CPE length is not adjusted. Alternatively, UE1 may also shorten the first CPE length to a third CPE length to ensure that UE2 can transmit on this time slot m.

Optionally, the third CPE length is smaller than the second CPE length, and if UE1 perceives that only one UE (e.g., UE 2) reserves the resources on the time slot m for transmission, UE2 may transmit on the time slot m, but may cause blocking of the transmission of UE 1.

In another possible implementation, the method further includes: the first terminal equipment determines a fourth CPE length according to the reservation message, the fourth CPE length corresponds to a fourth resource, and the fourth CPE length is larger than the second CPE length. Further, the first terminal device adjusts the first CPE length of the first terminal device to be a third CPE length according to the first CPE length, the fourth CPE length and the second CPE length, wherein the first time unit is a time domain resource of a superposition portion of the first resource and the second resource, and the third CPE length is greater than or equal to the fourth CPE length.

It should be appreciated that the first resource and the second resource (or the fourth resource) in this implementation do not overlap in the frequency domain.

For example, the first resource selected by UE1 is located in a time slot m (i.e., a first time unit), and UE1 performs a reservation empty and re-evaluation check at m-T3, and perceives that the second resource reserved by UE2 is also located in the time slot m, and the bandwidth of the RB set may be 20MHz, a certain preset value, or a certain configuration value, assuming that the first resource and the second resource are located in the same RB set. If the fourth CPE length corresponding to the fourth resource reserved by the UE4 in the time slot m is greater than the first CPE length corresponding to the first resource selected by the UE1, the transmission of the UE1 will be affected by inter-UE blocking of the UE4, and if the UE1 continues to occupy the time slot m, LBT will not pass when the channel is preempted using the first CPE length, so the UE1 needs to increase the first CPE length to be the third CPE length.

Optionally, if UE1 perceives that there are multiple UEs (e.g., UE2 and UE 4) reserving resources on the time slot m, UE1 may make the first transmission on the time slot m, but may cause blocking of the transmission of UE2 and UE 4.

Optionally, if UE1 perceives that there are multiple UEs (e.g., UE2 and UE 4) reserving resources in the time slot m, UE1 and UE4 may transmit simultaneously in the time slot m without blocking transmission but blocking transmission to UE 2.

Alternatively, the fourth CPE length may be the longest CPE length of all reserved resources on the time slot m perceived by the UE 1.

For example, the first resource selected by UE1 is located in a time slot m (i.e., a first time unit), and UE1 performs a reservation empty and re-evaluation check at m-T3, and perceives that the second resource reserved by UE2 is also located in the time slot m, and the bandwidth of the RB set may be 20MHz, a certain preset value, or a certain configuration value, assuming that the first resource and the second resource are located in the same RB set. If the length of the fourth CPE corresponding to the fourth resource reserved by the UE4 is smaller than the length of the first CPE corresponding to the first resource selected by the UE1, the transmission of the UE4 may be affected by the inter-UE blocking of the UE1, and at this time, the UE1 may continue to occupy the time slot m to perform the first transmission, and the length of the first CPE is not adjusted. Alternatively, UE1 may also shorten the first CPE length to a third CPE length.

Optionally, the third CPE length is smaller than the fourth CPE length, and if UE1 perceives that there are multiple UEs (e.g., UE2 and UE 4) reserving resources for transmission on the time slot m, UE4 may transmit on the time slot m, but may cause blocking of the transmission of UE 1. It should be appreciated that the transmission of UE4 may cause a blockage of the transmission of UE2, regardless of the size relationship of the third CPE length to the second CPE length.

Optionally, if UE1 perceives that there are multiple UEs (e.g., UE2 and UE 4) reserving resources for transmission in the time slot m, UE1 and UE4 may transmit simultaneously in the time slot m without blocking transmission but blocking transmission to UE 2.

It should be noted that, the implementation manner of performing the reserved space and reevaluation check on the UE1 and adjusting the length of the first CPE is not particularly limited in the present application. For example, a manner in which UE1 adjusts the length of the first CPE will be described taking as an example the case that transmission of UE1 is prevented from being blocked by transmission of other UEs.

In one example, after sensing all reservation messages on the time slot m, the UE1 compares CPE lengths corresponding to resources reserved by all reservation messages, and determines that the CPE length corresponding to the highest priority of transmission indicated by a certain reservation message is the fourth CPE length, so that the UE1 may directly increase the first CPE length to a third CPE length, where the third CPE length is greater than or equal to the fourth CPE length, so as to ensure that the UE1 may perform the first transmission on the time slot m.

In another example, after each time a reservation message is perceived by the UE1 in the time slot m, determining the CPE length corresponding to the resource reserved by the reservation message, and comparing the CPE length with the first CPE length, so as to determine whether the first CPE length needs to be adjusted in the perception. For example, in case that the second CPE length is perceived to be greater than the first CPE length, the UE1 may adjust (increase) its first CPE length to the second CPE length; next, under the condition that the fifth CPE length is perceived to be smaller than the CPE length currently adjusted by the UE1, the UE1 continuously maintains the CPE length currently adjusted; further, in the case that the fourth CPE length is perceived to be greater than the CPE length currently adjusted by the UE1, the UE1 may adjust (increase) its own currently adjusted CPE length 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 the reevaluation checks all reservation messages on the slot m. At this time, the CPE length of the UE1 has been adjusted to the longest CPE length in the time slot m, so as to ensure that the UE1 can perform the first transmission in the time slot m.

In yet another possible implementation, the first terminal device adjusts the first CPE length over the first time unit to a third CPE length in case the first CPE length is greater than or less than the second CPE length and the RSRP of the reservation message is below a first threshold.

It should be appreciated that the first resource and the second resource in this implementation are at least partially coincident in the frequency domain.

For example, the first resource selected by UE1 is located in time slot m (i.e., the first time unit), the second CPE length is the longest CPE length corresponding to the resource reserved by all reservation messages on time slot m, and UE1 performs the reservation and re-evaluation check at time m-T3, assuming that the first resource and the second resource are located in the same RB set, the bandwidth of the RB set may be 20MHz, a certain preset value, or a certain configuration value. If the UE1 senses that the second CPE length is greater than the first CPE length, the first resource coincides with at least part of the frequency domain resources of the second resource, and the RSRP of the reservation message is lower than the first threshold, the UE1 may transmit according to the second CPE length (or greater than the second CPE length), so that transmission blocking of the UE1 by the UE2 can be avoided; if the UE1 senses that the second CPE length is smaller than the first CPE length and the RSRP of the reservation message is lower than the first threshold, the UE1 may transmit according to the second CPE length (or smaller than the second CPE length), so that blocking caused by transmission of the UE1 to transmission of the UE2 can be avoided.

In yet another possible implementation, the first terminal device adjusts the first CPE length over the first time unit to be the third CPE length in case the first CPE length is greater than or less than the second CPE length and the frequency domain resources of the first resource do not coincide with the frequency domain resources of the second resource.

Wherein the third CPE length is greater than or equal to the second CPE length. It should be noted that, here, the frequency domain resources of the first resource and the second resource do not overlap means that the frequency domain resources of the first resource and the second resource do not overlap at all.

For example, the first resource selected by UE1 is located in time slot m (i.e., the first time unit), the second CPE length is the longest CPE length corresponding to the resource reserved by all reservation messages on time slot m, and UE1 performs the reservation and re-evaluation check at time m-T3, assuming that the first resource and the second resource are located in the same RB set, the bandwidth of the RB set may be 20MHz, a certain preset value, or a certain configuration value. If the UE1 senses that the second CPE length is greater than the first CPE length and the first resource is completely misaligned with the frequency domain resource of the reserved resource, the UE1 may transmit according to the second CPE length (or greater than the second CPE length), so that transmission of the UE1 can be prevented from being blocked by transmission of the UE 2; if the UE1 senses that the second CPE length is smaller than the first CPE length and the first resource is completely not overlapped with the frequency domain resource of the reserved resource, the UE1 may transmit according to the second CPE length (or smaller than the second CPE length) so as to avoid blocking the transmission of the UE2 by the transmission of the UE 1.

It should be noted that, the application scenario of this implementation manner refers to that the first terminal device has selected the first resource for the first transmission, and determines, through sensing, monitoring, or receiving the reservation message of the other terminal device, that the resource reserved by the other terminal device coincides with the time slot where the first resource selected by the first terminal device is located, that is, that the time domain resource of the first resource coincides partially or completely with the time domain resource of the second resource, for example, the current time slot.

According to the scheme provided by the application, the first terminal equipment performs resource reselection (namely, determines the third resource) or adjusts the first CPE length by comparing the first CPE length with other perceived CPE lengths, so as to determine whether to continue occupying the same time slot reserved by different terminal equipment for first transmission, avoid the transmission of the first terminal equipment from being blocked by the transmission of other terminal equipment (or avoid the transmission of the first terminal equipment from blocking the transmission of other terminal equipment), improve the transmission efficiency of the first terminal equipment, and avoid unnecessary waste of spectrum resources. In the process of reserving and reevaluating resources, the first terminal equipment introduces the CPE length as a condition for reelecting resources, or adjusts the first CPE length, improves the utilization rate of spectrum resources, and ensures the transmission performance of the terminal equipment.

The communication method 400 provided above is illustrated in connection with fig. 5.

Fig. 5 is a schematic diagram of the results of the reservation void and reevaluation check provided in the embodiments of the present application. As shown in fig. 5 (a), the time slot n is preceded by a sensing window, and the time slot n is followed by a resource selection window, considering that before the time slot n, UE1 senses that resources on subchannel 0 and subchannel 1 are reserved by UE2 and UE3, respectively, and UE1 does not sense that resources on subchannel 2 and subchannel are reserved, so in order to avoid transmission blocking between UEs, UE1 selects resource #1 (corresponding CPE length is CPE # 1) for the first transmission, and corresponding subchannel 3 and subchannel 2 may be located on time slot m. Where sub-channel 2 and sub-channel 3 can be understood as: UE1 selects the frequency domain resource of resource #1 for the first transmission. It should be understood that before UE1 performs the first transmission, UE1 needs to perform a reservation space and reevaluation check at m-T3, as shown in (b) of fig. 5, UE1 determines that UE2, UE3 and UE4 reserve resources on time slot m in the resource selection window at the same time by sensing, listening, or receiving reservation messages of other UEs (e.g., UE2, UE3, UE4 and UE 5), and that frequency domain resources of resources reserved by UE2, UE3 and UE4 on time slot m correspond to subchannel 0, subchannel 1 and subchannel 2, respectively, and it can be further seen that resources reserved by UE4 occur once every 3 time slots. In this example, the resources reserved by UE2, UE3, and UE4 within the resource selection window are referred to as resource #2, resource #3, and resource #4, respectively, and the corresponding CPE lengths are CPE #2, CPE #3, and CPE #4, respectively. It should be appreciated that CPE#2, CPE#3, and CPE#4 are transmitted on the last gap symbol on the m-1 slot, respectively. For example, the RB set on the slot m is 20MHz, and each sub-channel is 5MHz. The priority of the transmission of each resource in the time slot m is ue#2, ue#4 and ue#3 in order from high to low, and the corresponding CPE lengths are cpe#2, cpe#4 and cpe#3 in order from long to short.

For the above-mentioned multiple UEs reserving resources in the same time slot m, in order to avoid blocking transmission between UEs, UE1 may perform resource reselection by comparing different CPE lengths.

For example, if cpe#1 is smaller than cpe#2, then UE1 performs resource reselection and may not select resources on the time slot m for the first transmission; alternatively, UE1 may add cpe#1 to cpe#2 so that UE1 and UE2 may transmit simultaneously on the time slot m, avoiding that UE1 and UE2 transmissions are blocked by other UEs but blocking UE3 and UE4 transmissions; alternatively, UE1 may add CPE #1 to CPE #5, with CPE #5 being greater than CPE #2, at which point UE1 may use this time slot m for the first transmission, but may block transmissions for UE2, UE3, and UE 4.

Illustratively, if CPE#1 is greater than CPE#2, UE1 may continue to occupy the time slot m for the first transmission, but may block transmissions of UE2, UE3, and UE 4; alternatively, UE1 may shorten cpe#1 to cpe#2 so that UE1 and UE2 may transmit simultaneously on the time slot m, avoiding that UE1 and UE2 are blocked by transmissions of other UEs.

Illustratively, if CPE #1 is equal to CPE #4, then UE1 performs a resource reselection because resource #1 and resource #4 are coincident on subchannel 2 and the RSRP of the reservation message of UE4 is greater than the first threshold. For example, UE1 may not select the resource on the slot m (or subchannel 2 on the slot m) for the first transmission.

It should be noted that the foregoing is merely an example given for understanding the solution, and should not constitute any limitation on the technical solution of the present application.

Fig. 6 is a flow chart of a communication method 600 provided in an embodiment of the present application. As shown in fig. 6, the method includes the following steps.

S610, the first terminal device receives the reservation message.

S620, the first terminal equipment determines the length of the second CPE according to the reservation message.

Wherein the second CPE length corresponds to a second resource;

optionally, the first terminal device determines the second CPE length according to the subscription message, which may be that the first terminal device determines the second CPE length according to a priority (for example, priority or CAPC) of the transmission corresponding to the second resource; or, the first terminal device may determine the second CPE length according to the CPE length occupied by the subscription message. It should be noted that, the priority of the transmission here includes, but is not limited to: priority or CAPC.

It should be understood that the second CPE length corresponds to the second resource, and may be that the second 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 second resource. In addition, the priorities of different transmissions correspond to different CPE lengths. For example, a first transmission of a first terminal device corresponds to a first CPE length and a second transmission of a second terminal device corresponds to a second CPE length.

It should also be understood that, in the physical layer protocol, the candidate resource set may be understood as a candidate resource for the first transmission selected by the first terminal device from the resource pool, where the candidate resource set needs to be reported to the MAC layer, and further performs resource selection in the MAC layer. That is, after the selection of the resources by the MAC layer, some or all of the resources in the candidate resource set may be used for the first transmission by the first terminal device.

It should be noted that, the specific implementation of steps S610 and S620 of this implementation may refer to steps S410 and S420 of the method 400, respectively, and are not described herein for brevity.

S630, the first terminal equipment determines a candidate resource set according to the first CPE length and the second CPE length.

Wherein some or all of the resources of the candidate set of resources are used for the first transmission by the first terminal device, and the first CPE length is determined according to a priority of the first transmission by the first terminal device.

The specific implementation manner of determining the candidate resource set by the first terminal device is described in detail below with reference to fig. 7 to 9 by comparing different CPE lengths corresponding to reserved resources for different application scenarios.

In one possible implementation manner, in a case that the length of the first CPE is smaller than that of the second CPE, the first terminal device excludes a third resource, so as to obtain a candidate resource set, where the third resource is a frequency domain resource on a time unit where the second resource is located.

It should be understood that the third resource is a frequency domain resource on a time unit where the second resource is located, including: the third resource is a part or all of the frequency domain resource over the time unit where the second resource is located. For example, the third resource may be a resource within the RB set on the time unit, such as a frequency domain resource corresponding to subchannel 0 and subchannel 1; alternatively, the third resource may be a resource within a certain frequency domain over the time unit. The bandwidth of the RB set may be 20MHz, a certain preset value, or a certain configuration value.

That is, the first terminal device may preferentially select one or more of the following resources as the candidate resource set: the frequency domain resources on the nearby sub-channels (e.g., sub-channel 2 and sub-channel 3) are not reserved, or the CPE length is smaller than the reserved resource #1 corresponding to the first CPE length, or the CPE length is equal to the reserved resource #2 corresponding to the second CPE length, where the RSRP value of the reserved message corresponding to the reserved resource #2 is lower than the first threshold.

It should be noted that, the foregoing first terminal device may be used independently, that is, the first terminal device may only perform the action of excluding the resources or perform the action of incorporating the resources, or may be used in combination, that is, the first terminal device may exclude the third resources that do not meet the conditions at the same time, and use the resources that meet the transmission conditions as candidate resources.

Optionally, the second CPE length may be perceived by the UE1, where CPE lengths corresponding to all reserved resources on the same timeslot m are longest; alternatively, the second CPE length may not be the longest CPE length in the time slot m, which is not specifically limited in this application.

By way of example, UE1 senses that a second resource reserved by UE2 is located on time slot m by receiving a reservation message of UE2, and that a second CPE length corresponding to the second resource is greater than the first CPE length, if UE1 transmits on the time slot m, UE1 transmission may be affected by inter-UE blocking of UE2, resulting in transmission blocking for UE 1. Therefore, UE1 may exclude some or all of the frequency domain resources on the slot m to obtain candidate resources. For example, taking RB set on the time slot m where the second resource reserved by the UE2 is located as an example of 20MHz, where the frequency domain resource of the second resource is located in the sub-channel 0 and the sub-channel 3 (i.e., the third resource) on the time slot m, the UE1 may exclude all the 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 at all; alternatively, UE1 may exclude the frequency domain resources corresponding to sub-channel 0 and sub-channel 3 in the time slot m, i.e. the candidate resource set includes the frequency domain resources of other sub-channels in the time slot m, such as the frequency domain resources of sub-channel 1 and/or sub-channel 2.

Fig. 7 is a schematic diagram of resource selection provided in an embodiment of the present application. As shown in fig. 7, the time slot n is preceded by a sensing window, and the time slot n is followed by a resource selection window, and UE1 determines that the reserved resources exist in the resource selection window by sensing, monitoring, or receiving reservation messages of other UEs (e.g., UE2, UE3, and UE 4), where the reserved resources of UE2 are located in subchannel 1 on time slot n+5, and the reserved resources of UE3 are located in subchannel 2 on time slot n+3, and time slot n+9. For example, the RB set on each slot is 20MHz, and then each subchannel on each slot is 5MHz. The resources reserved by the UE2 and the UE3 in the resource selection window are respectively referred to as resource #2 and resource #3, and the corresponding CPE lengths are CPE #2 and CPE #3, respectively. It should be appreciated that CPE#2 and CPE#3 transmit on the last gap symbol on slots n+4 and n+2, respectively.

Illustratively, to avoid transmission blocking by other UEs for UE1, UE1 does not select resources corresponding to CPE lengths greater than the first CPE length (which may be referred to as CPE # 1) in this implementation. For example, if CPE #3 is greater than CPE #1, then the resources on slots n+3 and n+9 are not optional, i.e., the candidate resource set does not include slots n+3 and n+9. Alternatively, UE1 may increase cpe#1 to cpe#3 (even greater than cpe#3), then the resources on time slots n+3 and n+9 are now optional. If CPE#2 is smaller than CPE#1, then the resources on time slot n+5 are optional, i.e., the candidate set of resources includes time slot n+5. Wherein, ue#1 may perform a first transmission according to cpe#1 on time slot n+5, where the transmission of ue#1 will cause transmission blocking of ue#2; or, the ue#1 may perform the first transmission on the time slot n+5 according to the cpe#2, where the transmissions of the ue#1 and the ue#2 are not blocked, so that the transmission efficiency of the terminal device can be ensured, the spectrum utilization rate is improved, and the transmission delay is reduced.

In another possible implementation manner, in a case that the first CPE length is greater than the second CPE length, the first terminal device uses the fourth resource as a candidate resource set; wherein the fourth resource comprises: resources on the first time unit, wherein the first time unit is not overlapped with a time unit where the second resource is located; and/or part or all of the resources on the time unit where the second resource is located.

It should be appreciated that the second CPE length may be the longest of the CPE lengths corresponding to all reserved resources on the same time slot m as perceived by UE 1.

For example, by receiving the reservation message of the UE2, the UE1 senses that the second resource reserved by the UE2 is located on the time slot m, and if the UE1 performs the first transmission according to the first CPE length if the first CPE length is greater than the second CPE length, all the resources on the time slot m where the second resource corresponding to the second CPE length is located may be candidate resources, that is, the UE1 may select or reserve all the subchannels on the time slot m for the first transmission; or if the UE1 performs the first transmission according to the second CPE length, the size of the RSRP of the reservation message #2 (which may determine the second CPE length) and the first threshold needs to be further considered, and if the RSRP of the reservation message is lower than the first threshold, the time slot m where the second resource corresponding to the second CPE length is located may be used as the candidate resource.

For example, if the first CPE length is greater than the second CPE length, and the RSRP of the reservation message #2 is greater than the first threshold, the UE1 may exclude the timeslot m where the second resource is located from the candidate resource pool if the UE1 performs the first transmission according to the second CPE length.

It should be understood that the above manner of excluding or incorporating resources from the first terminal device may be used independently or in combination, which is not specifically limited in this application.

Optionally, the UE1 may further determine a fourth CPE length according to the sensing message, where the fourth CPE length corresponds to a fourth resource, and the fourth resource is the same as the time domain resource where the second resource is located (i.e. is located in the same time slot m). Assuming that UE1 determines, by sensing the reservation message, that 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), for example, if the UE1 performs the first transmission according to the first CPE length if the first CPE length is greater than the fourth CPE length, then all resources on the time slot m where the fourth resource corresponding to the fourth CPE length is located may be candidate resources, i.e., UE1 may select or reserve all subchannels on the time slot m for the first transmission; or if the UE1 performs the first transmission according to the fourth CPE length, the size of the RSRP of the reservation message #4 (which may determine the fourth CPE length) and the first threshold needs to be further considered, and if the RSRP of the reservation message is lower than the first threshold, the time slot m where the fourth resource corresponding to the fourth CPE length is located may be used as the candidate resource. For another example, if the first CPE length is greater than the fourth CPE length, and the RSRP of the reservation message #4 is greater than the first threshold, the UE1 may exclude the timeslot m where the fourth resource is located from the candidate resource pool if the UE1 performs the first transmission according to the fourth CPE length.

Fig. 8 is a schematic diagram of resource selection provided in an embodiment of the present application. As shown in fig. 8, the time slot n is preceded by a sensing window, the time slot n is followed by a resource selection window, and the UE1 determines that the resources reserved by the UE2 are located in the sub-channels 0 on the time slots n+4, n+5, n+8 and n+9, the resources reserved by the UE3 are located in the sub-channels 1 on the time slots n+5 and n+6, the resources reserved by the UE4 are located in the sub-channels 2 on the time slots n+3 and n+9, and the resources reserved by the UE5 are located in the sub-channels 2 on the time slots n+4 and n+7 by sensing, monitoring, or receiving reservation messages of other UEs (e.g., UE2, UE3, UE4 and UE 5). For example, the RB set on each slot is 20MHz, and then each subchannel on each 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 respectively CPE #2, CPE #3, CPE #4 and CPE #5. It should be appreciated that CPE#2, CPE#3, CPE#4, and CPE#5 respectively correspond to the resources on the last gap symbol of the previous slot on the slot.

Illustratively, CPE#2, CPE#4 are equal to CPE#1 of UE1, CPE#2 being larger than CPE#3, CPE#5. The UE1 determines that the resources on the slot n+2 have no reservation by sensing all reservation messages on each slot, i.e. the slot n+2 is an unreserved slot; cpe#4 corresponding to resource #4 on time slot n+3 is longest, cpe#2 corresponding to resource #2 on time slot n+4 is longest, cpe#2 corresponding to resource #2 on time slot n+5 is longest, cpe#3 corresponding to resource #3 on time slot n+6 is longest, cpe#5 corresponding to resource #5 on time slot n+7 is longest, cpe#2 corresponding to resource #2 on time slot n+8 is longest, cpe#2 corresponding to resource #2 on time slot n+9 is equal to cpe#4 corresponding to resource # 4.

In order to avoid blocking between different terminal devices and ensure the transmission efficiency of the terminal devices, in this implementation manner, the UE1 needs to select resources from time slots with the same CPE length or idle time slots, and because the reserved resources #3 on the time slots n+6 and n+7, the reserved resources #3 corresponding to the resources #5, and the reserved resources #5 are not equal to the CPE #1, the UE1 needs to exclude the resources on the time slots n+6 and n+7, and the resources on the other time slots n+2, n+3, n+4, n+5, n+8 and n+9 can be used as candidate resources for the first transmission of the UE1 and report to the MAC layer. Optionally, UE1 adjusts (decreases) cpe#1 to cpe#3, where if UE1 transmits according to cpe#3, time slots n+2 and n+6 may be used as candidate resources; alternatively, UE1 adjusts (decreases) cpe#1 to cpe#5, and in this case, if UE1 transmits according to cpe#5, time slots n+2 and n+7 may be used as candidate resources.

In yet another possible implementation manner, in a case where 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, resulting in a candidate resource set.

It should be noted that, for the second resource corresponding to the second CPE length, the UE1 excludes the resource in the second resource, which has part or all of the time-frequency resources overlapping with the first resource, and the RSRP of the reservation message is greater than the first threshold.

In other words, in case the first CPE length is equal to the second CPE length and the RSRP of the reservation message is higher than the first threshold, the first terminal device may take the fourth resource as a candidate resource set; wherein the fourth resource comprises: the resources on the first time unit are not overlapped with the time unit where the second resource is located, namely the resources on the time unit which is not reserved; and/or part or all of the resources on the time unit where the second resource is located.

It should be understood that the second CPE length may be perceived by UE1 as the longest CPE length corresponding to all reserved resources on the same time slot m.

For example, by receiving the reservation message of UE2, UE1 senses that the second resource reserved by UE2 is located on time slot m, and when the first CPE length is equal to the second CPE length, the UE may perform resource selection according to the RSRP of the reservation message and the size of the first threshold according to the existing R16/R17 flow. For example, if the UE1 determines that the RSRP of the reservation message of the second CPE length is higher than the first threshold, the UE1 excludes the resource on the time slot m where the second resource corresponding to the second CPE length is located.

For example, by receiving the reservation message of UE2, UE1 senses that the second resource reserved by UE2 is located on time slot m, and if the first CPE length is equal to the second CPE length, if UE1 determines that the RSRP of the reservation message of the second CPE length is lower than the first threshold, UE1 may take the resource on time slot m where the second resource corresponding to the second CPE length is located as the candidate resource.

It should be understood that the above manner in which the first terminal device excludes resources or incorporates resources may be used independently or may be used in combination, which is not specifically limited in this application.

When the resources reserved by the plurality of reservation messages are all on the time slot m, the UE1 needs to traverse all the reservation messages on the time slot m and finally determine the candidate resources, and may report part of the resources on the time slot m as the candidate resources to the MAC. For example, there are 3 reservation messages while reserving the resource on the slot m, and after UE1 perceives reservation message #1, it is determined that resource #1 is: subchannel 0 and subchannel 2 on slot m; further, after sensing the reservation message #2, the UE1 determines that the resource #2 is: all resources on slot m (including sub-channel 0-3); finally, after perceiving the reservation message #3, the UE1 determines that the resource #3 is: subchannel 0, subchannel 1, and subchannel 3 over time slot m. The UE1 may report the resources shared by the resource #1, the resource #2, and the resource #3 as candidate resources to the MAC layer by integrating the perceived results of all reservation messages on the slot m. For example, the resource corresponding to subchannel 0 on slot m.

It should be noted that, in the time slot m, there may be a fifth resource among all reserved resources perceived by the UE1, where the fifth CPE length corresponding to the fifth resource is smaller than the second CPE length (the longest CPE length corresponding to the reserved resource in the time slot m), i.e. the fifth resource is smaller than the first CPE length. For this case, the UE1 may determine the candidate resource by considering 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. In contrast, UE1 may use the fifth resource as a candidate resource without comparing the RSRP of the reservation message corresponding to the fifth CPE length with the first threshold. That is, in this implementation, only a reservation message having the same CPE length as the first CPE length on the same timeslot is perceived, the RSRP of the reservation message needs to be compared with the first threshold, and the second resource is excluded if the RSRP of the reservation message is higher than the first threshold.

Optionally, in the case where 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 UE1 may preferentially select one or more of the following resources as the candidate resource set in consideration of an in-band leakage (IBE) problem: assuming that UE2 reserves frequency domain resources corresponding to subchannel 1 and subchannel 0 on time slot m, UE1 may select frequency domain resources (e.g., subchannel 3) that are not reserved on nearby subchannels on that time slot m; or, the UE1 selects reserved resources corresponding to the CPE length smaller than the first CPE length; or, the UE1 selects the reserved resource #2 corresponding to the CPE length equal to the second CPE length, where the RSRP value of the reserved message corresponding to the reserved resource #2 is lower than the first threshold.

Fig. 9 is a schematic diagram of resource selection provided in an embodiment of the present application. As shown in fig. 9, the time slot n is preceded by a sensing window, the time slot n is followed by a resource selection window, and the UE1 determines that the resources reserved by the UE2 are located in the sub-channels 0 on the time slots n+4, n+5, n+8 and n+9, the resources reserved by the UE3 are located in the sub-channels 1 on the time slots n+5 and n+6, the resources reserved by the UE4 are located in the sub-channels 2 on the time slots n+3 and n+9, and the resources reserved by the UE5 are located in the sub-channels 2 on the time slots n+4 and n+7 by sensing, monitoring, or receiving reservation messages of other UEs (e.g., UE2, UE3, UE4 and UE 5). For example, the RB set on each slot is 20MHz, and then each subchannel on each 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 respectively CPE #2, CPE #3, CPE #4 and CPE #5. It should be appreciated that CPE#2, CPE#3, CPE#4, and CPE#5 respectively correspond to the resources on the last gap symbol of the previous slot on the slot.

For example, assuming that 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, UE1 determines that resources on slot n+2 have no reservation, i.e., slot n+2 is an unreserved slot, by perceiving all reservation messages on each slot; CPE#4 corresponding to resource#4 on time slot n+3 is longest, CPE#2 corresponding to resource#2 on time slot n+4 is longest, CPE#2 corresponding to resource#2 on time slot n+5 is longest, CPE#3 corresponding to resource#3 on time slot n+6 is longest, CPE#5 corresponding to resource#5 on time slot n+7 is longest, CPE#2 corresponding to resource#2 on time slot n+8 is longest, and CPE#2 corresponding to resource#2 on time slot n+9 is longest.

In order to avoid transmission blocking of UE1 to other UEs, in this implementation UE1 needs to select resources from the time slots with short CPE length or from the idle time slots. Since CPE#4 is larger than CPE#1, resources on slots n+3 and slot n+9 are not selectable; similarly, CPE #2 is larger than CPE #1, then the sources on slots n+4, n+5, n+8, and n+9 are not optional. Since CPE#3 is smaller than CPE#1, resources on time slot n+6 can be selectable; considering that CPE #5 is at CPE #1 and that the RSRP of the reservation message of UE5 is greater than the first threshold, the resources on slot n+7 are not selectable. In addition, the slot n+2 is used as an idle slot, and the resource on the slot n+2 is also optional. Therefore, the UE1 needs to exclude the resources on the slots n+3, n+4, n+5, n+7, n+8 and n+9, and the resources on the other slots n+2 and n+6 can be used as candidate resources for the first transmission of the UE1 and reported to the MAC layer.

It should be noted that, UE1 may transmit n+6 on the timeslot according to cpe#1, so as to ensure the transmission efficiency of UE1, but cause transmission blocking to UE 3; or, UE1 may transmit in time slot n+6 according to cpe#3, so as to ensure transmission efficiency of UE1 and UE3, and avoid transmission blocking. Similarly, UE1 may transmit in CPE #1 on time slot n+7, guaranteeing UE1 transmission efficiency, but causing transmission blocking for UE 5.

In yet another possible implementation, the method further includes: in case the candidate set of resources cannot meet the requirement of the first transmission of the first terminal device, the first terminal device increases the first CPE length. Further, the first terminal device determines a candidate resource set according to the increased first CPE length and the increased second CPE length.

Wherein the candidate resource set cannot meet the requirement of the first transmission of the first terminal device, including one or more of the following:

1. the number of time units in which the candidate resources in the candidate resource set are located is lower than a threshold #1; or,

2. the number of candidate resources in the candidate resource set is below a threshold #2; threshold #2 is the number of resources in the resource pool multiplied by a certain percentage; or,

3. the number of time units in which the candidate resources in the candidate resource set are located is smaller than a threshold #3, and the number of candidate resources in the candidate resource set is smaller than a threshold #4; or,

4. the method does not satisfy that the number of time units in which the candidate resources in the candidate resource set are located is greater than or equal to a threshold #5, and the number of candidate resources on average per time unit is greater than or equal to a threshold # 6; or,

5. the "number of time units in which the candidate resource in the candidate resource set is located is greater than or equal to the threshold #7, and the number of candidate resources on each time unit is greater than or equal to the threshold #8" is not satisfied.

The above-mentioned threshold values (e.g., threshold value #1 to threshold value #8, etc.) may be fixed values, or may be the number of time units in the resource pool multiplied by a ratio, which is not particularly limited in this application.

For example, x resources are required for the first transmission of UE1, and the candidate resource set finally determined by UE1 based on the CPE length through sensing the reservation message includes y resources, where y is smaller than x, the candidate resource set is inevitably unable to meet the requirement of the first transmission of the first terminal device, and at this time, UE1 may increase the probability of selecting the candidate resource set by increasing the length of the first CPE, so as to obtain more candidate resources for the first transmission.

Illustratively, x resources are required for the first transmission of UE1, and the set of candidate resources finally determined by UE1 based on the CPE length through the sensing reservation message includes y resources, where y is less than the number threshold z of candidate resources reported to the MAC layer, and the size relationship between the x and y values is not limited herein. It should be appreciated that the number threshold z may be protocol defined, in which case UE1 may increase the probability of selecting the candidate resource set by increasing the first CPE length, thereby obtaining more candidate resources for the first transmission.

It should be noted that, by increasing the length of the first CPE, the UE1 may increase the channel access opportunity, and use the increased length of the first CPE to screen out as many candidate resources for the first transmission from the candidate resource pool as possible. However, in the actual transmission process, the UE1 may use the resource corresponding to the longest CPE length on the timeslot m to perform the first transmission, so as to reduce the influence on the inter-UE blocking caused by other UEs; or, the UE1 may use the resource corresponding to the increased first CPE length to perform the first transmission, so as to ensure the transmission efficiency of the UE 1; alternatively, for the pre-transmission checking (pre-transmission checking) scenario, the UE1 may determine the candidate resource set according to the checking result, and the specific implementation manner may refer to the specific implementation manner of step S430 of the method 400, which is not described herein for brevity.

For example, for a certain time slot m, if the first CPE length increased by the UE1 is greater than the CPE length corresponding to the highest priority transmitted on the time slot m (e.g., CPE # 2), the resource on the time slot m may be used as a candidate resource for the UE1 to perform the first transmission and reported to the MAC layer. In actual transmission, UE1 may transmit according to the first CPE length in the time slot m, so as to ensure the transmission efficiency of UE1, but cause transmission blocking to UE 2; or, UE1 may also transmit on the time slot m according to the second CPE length, so as to ensure the transmission efficiency of UE1 and UE2 at the same time, and avoid transmission blocking.

In yet another possible implementation, the method further includes: the first terminal equipment 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.

Based on the implementation manner shown above, the first terminal device can determine the candidate resource set for performing the first transmission according to the comparison result of different CPE lengths. It should be understood that, after the physical layer determines the candidate resource set, the first terminal device needs to report the candidate resource set to the MAC layer for the MAC layer to perform resource selection, i.e. select part or all of the resources from the candidate resource set for use in performing the first transmission.

Next, a specific description will be given of the candidate resource set reported to the MAC layer by the first terminal device.

In one possible implementation, the set of candidate resources includes a first subset of candidate resources, and/or a second subset of candidate resources, where the second CPE length corresponding to the resources in the first subset of candidate resources is equal to the first CPE length and the second CPE length corresponding to the resources in the second subset of candidate resources is less than the first CPE length.

Illustratively, 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, the resources reserved by UE3 are time slot 1 and time slot 2, and the resources reserved by UE4 are time slot 2 and time slot 3 by sensing all reservation messages. For example, where the highest priority of transmission of UE2 on slot 1 corresponds to the largest CPE #2 length (e.g., CPE #2 is greater than CPE # 3) and CPE #2 is equal to the first CPE length, then the first subset of candidate resources includes the resources on slot 1; the length of CPE #3 corresponding to the highest priority of the transmission of UE3 on time slot 2 is the largest, and CPE #3 is less than the first CPE length, then the second subset of candidate resources comprises the resources on time slot 2; the CPE #4 length corresponding to the highest priority of transmission of UE4 on slot 3 is the largest (e.g., CPE #4 is greater than CPE # 2) and CPE #4 is greater than the first CPE length, then UE1 may exclude the resources on slot 3 from the candidate resource pool. Thus, the first subset of candidate resources for UE1 to report to the MAC layer includes resources on slot 1 and/or the second subset of candidate resources for UE1 to ultimately report to the MAC layer includes resources on slot 2.

In another possible implementation, the candidate resource set includes a third candidate resource subset, a second CPE length corresponding to a resource in the third candidate resource subset is equal to the first CPE length, and the resource in the third candidate resource subset is a resource on a first time unit, where the first time unit does not overlap with a time unit in which the second resource is located. .

Illustratively, 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, the resources reserved by UE3 are time slot 1 and time slot 2, and the resources reserved by UE4 are time slot 2 and time slot 3 by sensing all reservation messages. For example, where the highest priority of transmission of UE2 on slot 1 corresponds to the largest CPE #2 length (e.g., CPE #2 is greater than CPE # 3) and CPE #2 is equal to the first CPE length, then the third subset of candidate resources comprises the resources on slot 1; the length of CPE #3 corresponding to the highest priority of the UE3 transmission on time slot 2 is the largest, and CPE #3 is less than the first CPE length, then the third subset of candidate resources does not include the resources on time slot 2; the length of CPE #4 corresponding to the highest priority of transmission of UE4 on slot 3 is the largest (e.g., CPE #4 is greater than CPE # 2), then the third candidate subset of resources includes resources on slot 1 and resources on unreserved slots (e.g., slot 4 and/or slot 5).

In the Mode 2 scenario, the terminal device autonomously performs resource awareness and resource selection (or resource reservation) to determine the time-frequency resources occupied by SL transmission. For example, before the UE accesses the channel, the UE may preempt the channel by sending the CPE, and the specific preemption time may relate to the transmission priority (e.g. the value of the cap or priority), or may be specified according to a standard, or may be implemented inside the UE, where different transmission priorities correspond to different CPE lengths, and generally, the higher the transmission priority, the longer the corresponding CPE length.

It should be appreciated that CPE length is a time domain resource and CPE transmissions are made on the corresponding CPE length. The length of time for a CPE transmission may be generally defined as the CPE length, which refers to the time interval from the CPE start point (which may also be referred to as the CPE start position) to before the end device starts SL transmission, or from the CPE start point to the time interval before the next AGC symbol. That is, the CPE start point and the CPE length are in one-to-one correspondence, and the earlier the CPE start point, the longer the corresponding CPE length. Moreover, the starting point of the CPE is related to the priority of the transmission, and the priority of different transmissions corresponds to different starting points of the CPE, and generally the higher the priority or the smaller the CAPC value, the earlier the starting point of the CPE. In the embodiment of the present application, the CPE starting point and the CPE length are not particularly distinguished and may be used interchangeably without any particular description.

For example, in the time domain resource, the determination of the CPE start point may be any one of the following, and for convenience of understanding and description, in this embodiment of the present application, the CPE start point in the mode (1) is referred to as a first preset CPE start point, and the CPE start point uses a combination of modes (2) and (3) as a preset CPE start point set, and the CPE start point in the set is referred to as a second preset CPE start point, and relevant parts will not be repeated hereinafter.

Mode (1): the CPE start point is located in one symbol before the next AGC symbol, for example, the first CPE start point is on the last symbol of the previous slot, and the current slot is used for SL transmission;

mode (2): when the subcarrier spacing (SCS) is 15kHz, the CPE start point is located in one symbol before the next AGC symbol, for example, the first CPE start point is on the last symbol of the previous slot, and the current slot is used for SL transmission;

mode (3): when the SCS is 30kHz or 60kHz, the CPE start point is located within at most 2 symbols before the next AGC symbol, e.g., the first CPE start point is on the last or two symbols of the previous slot, which is then used for SL transmission.

In the above manner (3), the first CPE start point is on the last symbol or two symbols of the previous slot, and may be any symbol on the last 2 symbols, for example, the CPE start point is on the last 2 symbols, or for example, the CPE start point is on the last 1 symbol; also, taking the last 1 symbol as an example, the CPE start point may be located anywhere on the last 1 symbol, such as 16us or 25us after the start of the symbol, which is protocol specified or UE factory pre-configured.

Optionally, the first preset CPE start point is located in a symbol before the next AGC, and the first preset CPE start point is preconfigured, for example, may be a default value. The preset CPE start point set is located in one or two symbols before the next AGC and includes at least 2 values that are preconfigured. The preset CPE start point set is preconfigured or a value determined according to other factors such as priority (e.g., cap or priority), which is not limited in this application.

Regarding the use conditions and the situations of the CPE starting points in the above-mentioned modes (1) - (3), it is assumed that when the UE occupies a part of the frequency domain resources in one RB set (i.e., a partial RB set), it is considered that other frequency domain resources in the RB set can be used by other UEs, so that a fixed CPE starting point (or a fixed CPE length) can be adopted, for example, in the above-mentioned mode (1), so that the CPE starting points of the UEs are the same, and the corresponding CPE lengths are the same, that is, the CPE starting points of one or more UEs are earlier than the CPE starting points of other UEs, so that the problem that the other UEs cannot pass when performing LBT, i.e., block other UEs, is avoided; when the UE occupies all frequency domain resources within one RB set (i.e., full RB set), one CPE start point of the set of preset CPE start points may be employed, e.g., the second preset CPE start point in the above manner (2) or (3).

However, the SL transmission does not limit the specific location of the resource selection, that is, the UE occupying full RB set may coincide with the frequency domain resource used by the UE occupying partial RB set, in which case, if the CPE starting point of the UE occupying partial RB set is in the above manner (1) and the CPE starting point of the UE occupying full RB set is in the above manner (3), the CPE lengths of the two UEs will be unequal, which means that, among the UE occupying full RB set and the UE occupying partial RB set, the UE with the earlier CPE starting point will be the UE with the later CPE starting point, or the UE with the longer CPE length will be the UE with the shorter CPE length. Therefore, it may also happen that a low priority UE blocks a high priority UE, for example, the CPE start point of a high priority (or higher priority) UE (occupying full RB set) is later than the CPE start point of a low priority (or lower priority) UE (occupying partial RB set); alternatively, the CPE start point of a high priority (or higher priority) UE (occupying a partial RB set) is later than the CPE start point of a low priority (or lower priority) UE (occupying a full RB set).

Fig. 10 is a schematic diagram of resource selection performed by different terminal devices according to an embodiment of the present application. The explanation is given taking an example that the resources reserved or selected by different terminal devices include all or part of one or more RB sets in the frequency domain and one slot in the time domain. As shown in fig. 10 (a), on the same timeslot, the resource #1 selected by the UE-1 occupies all the resources in one RB set, the resource #2 reserved by the UE-x occupies part of the resources in the RB set, that is, the frequency domain resources of the resource #1 and the resource #2 on the same timeslot are partially overlapped, and assuming that the CPE starting point corresponding to the resource #1 selected by the UE-1 is determined in the above manner (2), the CPE starting point corresponding to the CPE #2 reserved by the UE-x is determined in the above manner (1), the CPE starting points adopted by the UE-1 and the UE-x may be different, if the CPE starting point of the UE-x is earlier than the CPE starting point of the UE-1, and the transmission priority of the UE-x is lower than the transmission priority of the UE-1, the transmission of the UE-x will block the UE-1, so that the UE-1LBT with high priority fails and cannot be transmitted. As shown in fig. 10 (b), on the same timeslot, the resource #1 selected by the UE-1 occupies all resources in the 4 RBs set, which are respectively RB set #0, RB set #1, RB set #2 and RB set #3, and the resource #2 reserved by the UE-x occupies part of the RBs set (for example, part of the RB set #0 and part of the RB set # 1), that is, there is a partial overlap between the resource #1 and the resource #2, and if the CPE starting point corresponding to the resource #1 selected by the UE-1 is determined in the above-mentioned manner (3), the CPE starting point corresponding to the CPE #2 reserved by the UE-x is determined in the above-mentioned manner (1), the CPE starting points adopted by the UE-1 and the UE-x may be different, and if the CPE starting point of the UE-1 is later than the CPE starting point of the UE-x, and the transmission priority of the UE-1 is higher than the transmission priority of the UE-x, that is the transmission block of the UE-1 with the transmission priority of the UE-x is the transmission block with the low priority, so that the UE-1 is degraded in performance.

Alternatively, as shown in fig. 10 (c), on the same slot, the resource #1 selected by the UE-1 occupies all resources in 4 RB sets, that is, RB set #0, RB set #1, RB set #2, and RB set #3, respectively, and the resource #2 reserved by the UE-x occupies all resources in one RB set (for example, RB set # 1), that is, the resource #1 and the resource #2 have partial overlap. In this scenario, UE-1 and UE-x may determine CPE start point-1 and CPE start point-x corresponding to resource #1 and resource #2, respectively, according to the transmission priority. Generally, the higher the priority, the earlier the corresponding CPE start point, and the longer the CPE length. For example, if the transmission priority of UE-1 is higher than the transmission priority of UE-x, then UE-1 may transmit on the resource # 1; if the transmission priority of the UE-1 is lower than that of the UE-x, the UE-x can transmit on the resource # 2; if the transmission priority of UE-1 is equal to the transmission priority of UE-x, then both UE-1 and UE-x transmissions may proceed normally. Optionally, the UE-1 in this scenario may also determine the CPE start point-1 by using the technical scheme provided in the embodiments of the present application, and the specific implementation may be described in the following related description.

Aiming at the problems, the application provides a communication method and a communication device, and the first terminal equipment determines CPE starting points and transmission priorities corresponding to different reserved resources according to perceived reserved information aiming at the situation that other terminal equipment reserves at least part of frequency domain resources on the same time domain resource with the first terminal equipment, and combines the transmission priorities of the first terminal equipment to determine the CPE starting of the first terminal equipment, so that the resources selected by the different terminal equipment are prevented from being collided as much as possible, and particularly, the transmission of high priority is not blocked by the transmission of low priority, the utilization rate of a frequency spectrum is improved, and the service transmission and experience of a user are ensured.

Fig. 11 is a flow chart illustrating a communication method 1100 according to an embodiment of the present application. As shown in fig. 11, the method includes the following steps.

S1110, the first terminal device receives a first reservation message.

Wherein the first reservation message indicates a 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 to the first terminal device by the network device, and the network device may receive the first reservation message from the second terminal device or other devices, that is, the manner in which the first reservation message is acquired by the first terminal device is not limited in this application. Specifically, the first terminal device perceives, listens to, or receives the first subscription message. The first reservation message may indicate, either explicitly or implicitly, the second resource reserved by the second terminal device. Wherein the second resource includes, but is not limited to: the specific meaning of each parameter may refer to the description related to step S410 of the method 400, and is not repeated herein for brevity.

It should be noted that, the number of the first terminal device that senses, listens to, or receives the reservation message, and the number of other terminal devices that send the reservation message to the first terminal device are not specifically limited in the present application. I.e. the subscription message may be one or more. When there are a plurality of reservation messages, the plurality of reservation messages may be sent by the same terminal device, and are used for indicating a plurality of resources reserved by the terminal device; alternatively, the plurality of reservation messages may be sent by different terminal devices, for indicating the resources reserved by each terminal device, for example, the first terminal device may also receive the second reservation message from the second terminal device, or the first terminal device may also receive the second reservation message from the third terminal device.

It should be noted that, in the embodiment of the present application, if the reservation message of the second terminal device indicates that the second terminal device reserves a plurality of continuous time slots, the second resource is located in a first time slot of the plurality of continuous time slots; if the reservation message indicates that the second terminal device reserved a time slot, then the time domain resource of the second resource is the time slot, and it should be understood that the exemplary description applies equally to the reserved resources of the reservation message in other embodiments.

S1120, the first terminal device determines the starting point of the second CPE and the priority of the second transmission corresponding to the second resource according to the first reservation message.

Wherein the second CPE starting point corresponds to a second resource. For example, when the frequency domain resource of the second resource occupies full RB set, the second CPE start point is determined according to the priority of the second transmission, e.g., may be determined in the manner (2) or (3) described above, e.g., the second CPE start point may be located in one symbol on a previous time unit (e.g., a slot), such as a GP symbol, or in the last or two symbols on the previous time unit, and the current time unit is used for the transmission of the second resource; when the frequency domain resource of the second resource occupies the partial RB set, the second CPE start point may be determined in the above manner (1), for example, the second CPE start point may be located in one symbol on a previous time unit, and the current time unit is used for transmission of the second resource.

The first terminal device determines the second CPE starting point according to the first subscription message, which may be that the first terminal device determines the second CPE starting point according to the priority of the second transmission; alternatively, the first terminal device may determine the second CPE starting point according to the CPE starting point of the first subscription message.

S1130, 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.

Wherein the first resource is a resource selected by the first terminal device for the first transmission, and the first resource coincides with at least part of a frequency domain resource (e.g. RB set) of the second resource on the same time unit (e.g. slot). It should be appreciated that the first CPE start point corresponds to the first resource, meaning that the first CPE start point may be located within one symbol on a previous time unit (e.g., slot) or within the last one or two of the previous time units, the current time unit being used for transmission of the first resource.

In this embodiment of the present application, the first resource may be a resource that occupies full RB set, or may be a resource that occupies partial RB set, which is not specifically limited in this application. 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 in the first time unit (e.g. slot #m), for example, the frequency domain resources occupied by the UE-1 shown in fig. 10 (b), the first terminal device may determine the corresponding CPE starting point according to the above manner (2) or (3), where the CPE starting point of the UE-1 is the second preset CPE starting point; if the first resource occupies a part of the frequency domain resources (partial RB set) of one or more resource block sets in the first time unit (e.g. slot #m), for example, the frequency domain resources occupied by UE-X shown in fig. 10 (a) and fig. 10 (c), the first terminal device may determine the corresponding CPE starting point according to the above manner (1), where the CPE starting point of the UE-1 is a first preset CPE starting point.

It should be noted that, the application scenario of this implementation manner refers to that the first terminal device selects the first resource for the first transmission, and determines that, by sensing, listening, or receiving a reservation message of the other terminal device (for example, the first reservation message of the second terminal device), there is a partial overlap of the frequency domain resource on the same time unit (for example, a certain time slot) where the resource reserved by the other terminal device and the first resource selected by the first terminal device are located.

Next, specific implementation manners of determining the first CPE starting point or the third resource by the first terminal device according to the priority of the second transmission, the second CPE starting point and the priority of the first transmission are described with reference to fig. 12 and 13, respectively, with respect to the frequency domain resources occupied by the first terminal device and the second terminal device.

Case one:

for the scenario that the first terminal equipment selects full RB set resource (i.e., first resource), the second terminal equipment reserves partial RB set resource (i.e., second resource), a specific implementation manner of determining the first CPE start point by the first terminal equipment according to the priority of the second transmission, the second CPE start point and the priority of the first transmission is described.

At this time, the first resource occupies all of the frequency domain resources of the one or more resource block sets over the first time unit (e.g., slot #m), and the second resource occupies part of the frequency domain resources of the one or more resource block sets over the first time unit. The second CPE start point is a first preset CPE start point determined in the above manner (1).

In a first implementation, the first terminal device determines that the first CPE start point is no later than the second CPE start point if the priority of the first transmission is higher than or equal to the priority of the second transmission. In other words, the first CPE start point may be equal to or earlier than the second CPE start point, so that the high priority first transmission is not caused to be blocked by the low priority second transmission.

For example, if the CPE start point determined by the first terminal device for the first transmission (for convenience of description, hereinafter referred to as CPE start point #1 and not repeated herein) is earlier than or equal to the second CPE start point before executing step S1130, the first terminal device may not adjust, where the CPE start point #1 is the first CPE start point, and the first terminal device may normally perform the first transmission. If the CPE start point #1 is later than the second CPE start point, the first transmission may be blocked by the second transmission, so that the first terminal device may adjust the CPE start point #1 to the same position as the second CPE start point, or may also obtain the first CPE start point before adjusting the CPE start point #1 to the second CPE start point, so that the first transmission may be performed normally. That is, the first CPE start point determined by the first terminal device is the earlier one of the CPE start point #1 and the second CPE start point. I.e. the implementation ensures 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 in an embodiment of the present application. As shown in fig. 12, the case where the resources reserved or selected by different terminal devices include one RB set in the frequency domain (for example, one RB set includes all or part of the resources of 4 subchannels, such as subchannel 0, subchannel 1, subchannel 2, and subchannel 3, for example), and one slot in the time domain is illustrated. Assume that resource #1 selected for the first transmission is located at one full RB set on slot m, i.e., resource #1 occupies sub-channel 0, sub-channel 1, sub-channel 2, and sub-channel 3 on slot m. For example, the RB set on the slot m is 20MHz, and each sub-channel is 5MHz. It should be understood that, before UE1 performs the first transmission, UE1 needs to perform the reservation and reevaluation check at m-T3, the sensing window is before time slot n, the resource selection window is after time slot n, before time slot n, UE1 determines that UE2 and UE3 reserve the resources on time slot m in the resource selection window at the same time by sensing, monitoring, or receiving the reservation messages of other UEs (e.g. UE2 and UE 3), and the frequency domain resources of the reserved resources of UE2 and UE3 on time slot m correspond to subchannel 0 and subchannel 2 respectively, and in addition, it can be seen that the reserved resources of UE3 appear once every 3 time slots. That is, UE1 partially coincides with the presence of frequency domain resources of UE2 and UE3, respectively, over time slot m. In this example, the resources reserved by UE2 and UE3 in the resource selection window are referred to as resource #2 and resource #3, respectively, and the corresponding CPE start points are CPE start point #2 and CPE start point #3, respectively. The CPE start points #2 and #3 may be predefined, for example, the first preset CPE start point is located in the last symbol on the m-1 slot.

In order to avoid that the transmission of UE1 is blocked by the transmission of other UEs, it is assumed that the transmission priority of UE2 is higher than the transmission priority of UE3 in this time slot m, and if the transmission priority of UE1 is higher than the transmission priorities of UE2 and UE3, the CPE start point #1 of the resource #1 selected by UE1 for the first transmission cannot be later than the earliest one of the CPE start point #2 and CPE start point # 3. Illustratively, if the UE1 determines that the CPE start point #2 is earliest and the CPE start point #1 is earlier than or equal to the CPE start point #2, the UE1 may not adjust the CPE start point #1. If the CPE start point #1 is later than the start point of the CPE start point #2, the UE1 may adjust the CPE start point #1 to the same position as the CPE start point #2 or adjust the CPE start point #1 to a position before the CPE start point #2 so that the transmission of the UE1 may be performed normally.

In a second implementation, the first terminal device determines that the first CPE start point is equal to the second CPE start point if the priority of the first transmission is equal to the priority of the second transmission. It should be appreciated that since the priority of the first transmission is equal to the priority of the second transmission, and the second CPE start point may be predefined, e.g. the first preset CPE start point described above, setting the first CPE start point equal to the second CPE start point may avoid blocking the first and second transmissions of the same priority from each other. That is, the first CPE starting point determined by the first terminal device may be the first preset CPE starting point.

For example, if the CPE start point #2 corresponding to the second resource is earlier than the CPE start point #1 corresponding to the first resource, the UE1 may adjust the CPE start point #1 to the CPE start point #2, so that the UE1 and UE2 may be guaranteed to perform normally; or the UE1 may also adjust the CPE start point #1 to the CPE start point #2 before obtaining the first CPE start point, so that the normal transmission of the UE1 may be ensured. If the CPE start point #2 corresponding to the second resource is later than the CPE start point #1 corresponding to the first resource, the UE1 may not be adjusted, and at this time, the CPE start point #1 is the first CPE start point, so that the transmission of the UE1 is performed normally; if the CPE start point #2 corresponding to the second resource is equal to the CPE start point #1 corresponding to the first resource, the UE1 may not be adjusted, and the CPE start point #1 is the first CPE start point, so that the transmissions of the UE1 and the UE2 are both performed normally.

As shown in fig. 12, assuming that the transmission priorities of UE1, UE2 and UE3 in the time slot m are the same, UE1 determines that the CPE start point #1 of the resource #1 selected by the first transmission is equal to the CPE start point #2 and CPE start point #3, so as to ensure that the transmissions of UE1, UE2 and UE3 are not blocked, and improve the spectrum utilization. Alternatively, if UE1 determines that CPE start point #2 is earlier than CPE start point #3 and that CPE start point #1 is earlier than or equal to CPE start point #2, UE1 may not adjust CPE start point #1 to prevent transmission of UE1 from being blocked by transmission of UE 2. If the CPE start point #1 is later than the start point of the CPE start point #2, the UE1 may adjust the CPE start point #1 to the same position as the CPE start point #2 to ensure normal transmission of the UE1 and the UE2, or adjust the CPE start point #1 to a position before the CPE start point #2 so that transmission of the UE1 may be performed normally.

In a third implementation, the first terminal device determines that the first CPE start point is not earlier than the second CPE start point in case the priority of the first transmission is lower than or equal to the priority of the second transmission. In other words, the first CPE start point may be equal to the second CPE start point or may be later than the second CPE start point, so that high priority transmissions are not blocked by low priority transmissions.

For example, if the CPE start point #1 is later than or equal to the second CPE start point, the first terminal device may not adjust, and the CPE start point #1 is the first CPE start point, so that the second transmission can be guaranteed to be performed normally. If the CPE starting point #1 is earlier than the second CPE starting point, the first terminal device may adjust the CPE starting point #1 to the same position as the second CPE starting point, or may also adjust the CPE starting point #1 to the second CPE starting point to obtain the first CPE starting point, so as to ensure that the second transmission is performed normally. That is, the first CPE start point determined by the first terminal device is the later one of the CPE start point #1 and the second CPE start point. I.e. the implementation ensures that the high priority second transmission is not blocked by the low priority first transmission.

As shown in fig. 12, assuming that the transmission priority of UE2 is higher than the transmission priority of UE3 in the time slot m, if the transmission priority of UE1 is lower than the transmission priority of UE2, if UE1 determines that CPE start point #2 is earlier than CPE start point #3 and CPE start point #1 is earlier than or equal to CPE start point #2, UE1 may adjust CPE start point #1 to the same position as CPE start point #2 or CPE start point #1 to a position after CPE start point #2 to ensure that the transmission of UE2 is not blocked. If the transmission priority of UE2 is lower than the transmission priority of UE3 in the time slot m, and the transmission priority of UE1 is lower than the transmission priority of UE3, when UE1 determines that CPE start point #2 is later than CPE start point #3 and CPE start point #1 is earlier than or equal to CPE start point #3, UE1 may adjust CPE start point #1 to the same position as CPE start point #3 or CPE start point #1 to a position after CPE start point #3 to ensure that transmission of UE3 is not blocked.

In a fourth implementation, the first terminal device determines a third resource, where part or all of the third resource is used for the first transmission by the first terminal device, if the priority of the first transmission is lower than or equal to the priority of the second transmission. Wherein the third resource does not include the second resource.

Optionally, in the case that the priority of the first transmission is lower than or equal to the priority of the second transmission, and the CPE start point #1 corresponding to the first transmission is later than the CPE start point #2 corresponding to the second transmission, the first terminal device determines a third resource, that is, triggers reselection.

For example, if the reservation message of the other terminal device (e.g., the second terminal device) indicates that the second terminal device reserves a plurality of consecutive time slots, the second resource is located in a first time slot of the plurality of consecutive time slots, and the third resource determined by the first terminal device does not include the first time slot of the plurality of time slots; if the reservation message indicates that the second terminal equipment reserves a time slot, the time domain resource of the second resource is the time slot, and the corresponding third resource determined by the first terminal equipment does not comprise the time slot.

In order to avoid the transmission of the second terminal equipment of the transmission block of the first terminal equipment, or the transmission of the first terminal equipment of the transmission block of the second terminal equipment, the first terminal equipment can not perform the first transmission on the first resource, and the first terminal equipment and the second terminal equipment can perform normal transmission by triggering resource reselection. The third resource reselected by the first terminal device may occupy full RB set on another time unit (for example, slot #p) for the first transmission of the first terminal device, i.e., the third resource is not overlapped with the second resource in the frequency domain. The implementation manner of triggering the resource reselection may refer to the above related description, and for brevity, will not be repeated here.

It should be noted that, in the physical layer protocol, the third resource actually refers to a candidate resource for the first terminal device to perform the first transmission, where the first terminal device needs to report the third resource to the MAC layer, and further performs resource selection in the MAC layer, that is, selects part or all of the resources from the third resource for the first terminal device to perform the first transmission. The specific implementation manner of reporting the third resource to the MAC layer by the first terminal device may refer to the description related to fig. 9, and for brevity, the description is not repeated here.

It is further indicated that if the reservation message reserves a plurality of consecutive time slots, the second resource is in the first time slot of the plurality of consecutive time slots; if the reservation message reserves a time slot, the second resource is on the time slot.

For example, as shown in fig. 12, assuming that UE1 is less than the transmission priority of UE2 and less than the transmission priority of UE3 in the time slot m, and that UE1 determines that the CPE start point #1 of the resource #1 selected for the first transmission is later than the CPE start point #2 and later than the CPE start point #3, UE1 gives up the resource selected for the first transmission, i.e., UE1 determines that the first transmission is not performed in the time slot m. Optionally, the UE1 may select, by means of resource reselection, to select the resource on the time slot m-2 for the first transmission for transmission, so as to avoid that the transmission of the UE1 is blocked by the transmission of other UEs.

Optionally, in this implementation, the UE1 may determine whether to perform resource reselection according to the transmission priority, that is, without considering the location of the CPE starting point corresponding to the reserved or selected resource of each UE. For example, in the case where it is determined that the transmission priority of UE1 is less than the transmission priority of UE2 on the time slot m, UE1 may determine to trigger resource reselection to avoid transmission on the time slot m being blocked by other high priority transmissions.

Optionally, in this implementation, the UE1 may determine whether to perform resource reselection according to the transmission priority and the CPE start point. For example, when determining that the transmission priority of UE1 in the time slot m is smaller than the transmission priority of UE2, and the position of CPE start point #1 of UE1 is later than CPE start point #2 of UE2, UE1 may determine to trigger resource reselection, so as to avoid transmission in the time slot m being blocked by other high priority transmissions.

In a fifth implementation manner, the first terminal device determines that the first CPE start point is a first preset CPE start point or a second preset CPE start point when the priority of the first transmission is higher than the priority of the second transmission and the priority of the first transmission is lower than the priority of the third transmission.

Before the first terminal device determines that the first CPE start point is the first preset CPE start point or the second preset CPE start point, the method further includes: the first terminal equipment receives a second reservation message, the second reservation message indicates a third resource reserved by the third terminal equipment, and the third resource coincides with at least part of frequency domain resources of the first resource on the same time unit; and the first terminal equipment determines a third CPE starting point and a third transmission priority corresponding to a third resource according to the second reservation message, wherein the third CPE starting point corresponds to the third resource. Further, the first terminal device determines the first CPE start point according to the priority of the second transmission, the second CPE start point, the priority of the third transmission, the third CPE start point and the priority of the first transmission.

It should be understood that the third CPE starting point corresponds to the third resource, and it may be understood that the frequency domain resource of the third resource occupies a partial RB set, and the third CPE starting point may be determined in the above manner (1), for example, the third CPE starting point may be located in the last symbol on the previous time unit, and the current time unit is used for transmitting the third resource. In addition, the first terminal device determines a third CPE starting point according to the second subscription message, which may be that the first terminal device determines the third CPE starting point according to the priority of the third transmission; alternatively, the first terminal device may determine the third CPE starting point according to the CPE starting point of the second subscription message.

In other words, since the priority of the first transmission is higher than the priority of the second transmission and the priority of the first transmission is lower than the priority of the third transmission, considering that the second CPE start point and the third CPE start point may be the first preset CPE start point determined according to the above-described manner (1), the first CPE start point determined by the UE1 may also be the first preset CPE start point. For example, if the third CPE start point corresponding to the third resource is earlier than or equal to the CPE start point #1 and the second CPE start point, the UE1 may not be adjusted, and the CPE start point #1 is the first CPE start point, so that normal operation of the third transmission may be ensured. If the CPE start point #1 is earlier than the third CPE start point, the UE1 may adjust the CPE start point #1 to the position of the third CPE start point, or obtain the first CPE start point after adjusting to the third CPE start point, so as to ensure that the transmission of the UE3 is performed normally. If the CPE starting point #1 is later than the second CPE starting point, the UE1 may adjust the CPE starting point #1 to the position of the second CPE starting point, or obtain the first CPE starting point before adjusting to the second CPE starting point, so as to ensure that the first transmission is performed normally.

As shown in fig. 12, assuming that the transmission priority of UE2 is higher than the transmission priority of UE3 in the time slot m, if the transmission priority of UE1 is higher than the transmission priority of UE2 and lower than the transmission priority of UE3, UE1 determines that CPE start point #2 is earlier than CPE start point #3 and CPE start point #1 is earlier than or equal to CPE start point #2, UE1 may not be adjusted, and at this time, UE1 may transmit normally. If UE1 determines that CPE start point #2 is later or not earlier than CPE start point #3 and CPE start point #1 is earlier or not later than CPE start point #2, UE1 may not be adjusted and the transmission of UE3 may proceed normally. If the UE1 determines that the CPE start point #2 is equal to the CPE start point #3 and the CPE start point #1 is different from the CPE start point #2 and the CPE start point #3, the UE1 may adjust the CPE start point #1 to the same start position as the CPE start point #2 and the CPE start point #3 so that transmission of the UE1 may be performed normally.

In a sixth implementation manner, the first terminal device determines the first CPE start point as the second preset CPE start point if the priority of the second transmission is higher than or equal to the priority of the first transmission. The second preset CPE starting point is overlapped with the first preset CPE starting point, and the second preset CPE starting point is one of the preset CPE starting point sets.

It should be noted that, the second preset CPE start point is one of the preset CPE start point sets, 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, and the specific definition of the second preset CPE start point and the preset CPE start point set is described in the above related description.

It should be understood that, according to the above modes (1) and (2), the second preset CPE start point and the first preset CPE start point coincide. Therefore, in the case that the first terminal device determines that the priority of the second transmission is higher than or equal to the priority of the first transmission according to the reception of the first reservation message according to the perceived reservation of the second terminal device occupying the partial RB set, the first terminal device may determine the first CPE starting point in the above-described manner (2). That is, the positions of the first CPE start point and the second CPE start point are the same, and at this time, the transmission of the lower priority first terminal device may be performed normally. For example, if the second CPE starting point is later than the CPE starting point #1 corresponding to the first resource, the UE1 may block the UE2, and the UE1 may adjust the CPE starting point #1 to the position of the second CPE starting point, or obtain the first CPE starting point after adjusting to the second CPE starting point, so that the UE2 may perform transmission normally; if the second CPE start point corresponding to the second resource is earlier than the CPE start point #1 corresponding to the first resource, the UE1 may not be adjusted, and the CPE start point #1 is the first CPE start point, so that normal transmission of the UE2 may be ensured.

As shown in fig. 12, assuming that the transmission priority of UE2 is higher than that of UE3 in the time slot m, if the transmission priority of UE1 is lower than that of UE3, when UE1 determines that CPE start point #2 is earlier than CPE start point #3 and CPE start point #1 is earlier than CPE start point #2, UE1 may adjust CPE start point #1 to the same position as CPE start point #2 or CPE start point #1 to a position after CPE start point #2 to ensure that the transmission of UE2 is not blocked. If the CPE start point #2 determined by the UE1 is at the CPE start point #3 and the CPE start point #1 is later than or equal to the CPE start point #2, the UE1 may not be adjusted, so that the normal transmission of the UE2 may be ensured.

It should be noted that the various implementations provided above are examples given only for facilitating understanding of the solution, and should not constitute any limitation on the technical solution of the present application.

Optionally, in the case that the first terminal device does not send the reservation message, the first terminal device determines the first CPE start point according to the priority of the second transmission, the second CPE start point, and the priority of the first transmission. It should be understood that the first terminal device does not send any reservation message to other terminal devices in advance for the first transmission to be performed, or other terminal devices cannot sense, monitor, or receive the reservation message sent by the first terminal device, so that the first resource required by the first terminal device for performing the first transmission cannot be timely acquired, which includes but is not limited to: reservation interval information, frequency domain resource information, time domain resource information, priority information, and the like.

Alternatively, if the first terminal device does not perceive the reservation message of the second terminal device in the above step S1110, the first terminal device may determine the first CPE starting point according to the full RB set resource occupied by itself according to the above manner (2) or (3).

Alternatively, if the first terminal device sends a reservation message to the other terminal device before the first transmission is performed, the first terminal device may determine the first CPE start point for the first transmission according to the full RB set resource occupied by itself according to the above-described mode (2) or mode (3), and the first terminal device may not perform the steps of the above-described method 1100, at this time, the above-described process may be performed by the second terminal device by default, that is, the second terminal device determines the second CPE start point according to the first CPE start point, the priority of the first transmission, and the priority of the second transmission. The specific implementation manner of determining the starting point of the second CPE by the second terminal device may refer to the following description of determining the starting point of the first CPE by the first terminal device in case 2, which is not described herein for brevity.

And a second case:

for a scenario in which the first terminal device reserves a partial RB set resource (i.e., a first resource), the second terminal device selects a full RB set resource (i.e., a second resource), a specific implementation manner in which the first terminal device determines the first CPE starting point according to the priority of the second transmission, the second CPE starting point, and the priority of the first transmission is described, and a part that is not described in detail may refer to a related description of the first case, which is not repeated herein for brevity.

At this time, the first resource occupies a portion of the frequency domain resources of the one or more resource block sets over the first time unit (e.g., slot #m), and the second resource occupies all of the frequency domain resources of the one or more resource block sets over the first time unit. The second CPE start point may be a second preset CPE start point determined in the above-described manner (2) or (3). In this case, the second CPE start point is determined based on a priority (e.g., priority or CAPC) of the second transmission, which is determined based on the first subscription message; alternatively, the second CPE start point is determined from the CPE start point of the first subscription message.

Optionally, for the scenario that the first terminal device reserves a partial RB set resource (i.e., the first resource), and the second terminal device selects a full RB set resource (i.e., the second resource), the first terminal device may also determine the first CPE starting point corresponding to the first transmission according to the above manner (2) or (3).

Fig. 13 is a schematic diagram of resource selection provided in an embodiment of the present application. As shown in fig. 13, the explanation is given by taking the example that the resources reserved or selected by different terminal devices include one RB set in the frequency domain (for example, one RB set includes all or part of the resources of 4 subchannels, such as subchannel 0, subchannel 1, subchannel 2, and subchannel 3, for example), and one slot in the time domain. Assume that resource #1 selected by UE1 for the first transmission is located at one partial RB set on slot m, i.e., resource #1 occupies sub-channel 1 on slot m. For example, the RB set on the slot m is 20MHz, and each sub-channel is 5MHz. It should be appreciated that before UE1 makes the first transmission, UE1 needs to make a reservation and reevaluation check at time m-T3, slot n is preceded by a sensing window, slot n is followed by a resource selection window, and before slot n, UE1 determines that UE2 has reserved all resources on slot m, i.e., subchannel 0, subchannel 1, subchannel 2, and subchannel 3, within the resource selection window at the same time by sensing, listening, or receiving reservation messages of other UEs (e.g., UE 2). That is, there is partial overlap of the frequency domain resources of UE1 and UE2 over time slot m. In this example, the resources reserved by UE2 within the resource selection window are referred to as resource #2, and the corresponding CPE start point is referred to as CPE start point #2. Wherein CPE start point #2 may be predefined, e.g., a second preset CPE start point determined according to the above-described manner (2) or (3), within the last one symbol on the m-1 slot, or within the last two symbols on the m-1 slot.

For example, if the CPE start point #1 determined by the UE1 for the first transmission is earlier than or equal to the CPE start point #2 before the step S1130 is performed, the UE1 may not be adjusted, and the CPE start point #1 is the first CPE start point at this time, and the UE1 may normally perform the first transmission. If the CPE start point #1 is later than the CPE start point #2, the first transmission may be blocked by the second transmission, so the UE1 may adjust the CPE start point #1 to the same position as the CPE start point #2, or may obtain the first CPE start point before adjusting the CPE start point #1 to the CPE start point #2, so that the first transmission may be performed normally. That is, the first CPE start point determined by the first terminal device is an earlier one of the CPE start point #1 and the second CPE start point to ensure that transmission of the UE1 is not blocked. I.e. the implementation ensures that the high priority first transmission is not blocked by the low priority second transmission.

In a second implementation, the first terminal device determines that the first CPE start point is equal to the second CPE start point if the priority of the first transmission is equal to the priority of the second transmission. It should be appreciated that since the priority of the first transmission is equal to the priority of the second transmission, and the second CPE start point may be predefined, e.g. the second preset CPE start point described above, the first CPE start point may be set at the location of the second CPE start point, and the first transmission and the second transmission of the same priority may be prevented from blocking each other. That is, the first CPE starting point determined by the first terminal device may be the second preset CPE starting point.

Optionally, 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 determined according to the above manner (2) or (3), that is, the first CPE starting point is equal to the second preset CPE starting point, and since the second terminal device selects a full RB set resource (that is, the second resource), the second CPE starting point corresponding to the second resource is the second preset CPE starting point in the preset CPE starting point set, at this time, the first CPE starting point and the second CPE starting point are the same, and are both the second preset CPE starting points determined according to the above manner (2) or (3), and this manner ensures that different transmissions can all normally proceed without blocking or being blocked by selecting the same CPE starting point for the transmission with the same priority.

As shown in fig. 13, assuming that the transmission priority of UE2 in the time slot m is equal to the transmission priority of UE1, if CPE starting point #1 of resource #1 selected by UE1 for the first transmission is equal to CPE starting point #2, UE1 may not be adjusted, i.e., both UE1 and UE2 transmissions may be performed normally. If the CPE start point #1 is later or earlier than the CPE start point #2 in order to avoid blocking the first and second transmissions of the same priority from each other and to improve spectrum utilization, the UE1 may adjust the CPE start point #1 to the same position as the CPE start point # 2.

In a third implementation, the first terminal device determines that the first CPE start point is not earlier than the second CPE start point in case the priority of the first transmission is lower than or equal to the priority of the second transmission. In other words, the first CPE start point may be equal to the second CPE start point or may be later than the second CPE start point, so as not to cause the high priority second transmission to be blocked by the low priority first transmission.

As shown in fig. 13, assuming that the priority of the transmission of the resource reserved by the UE2 on the slot m is higher than or equal to the transmission priority of the UE1, if the CPE start point #1 is earlier than or equal to the CPE start point #2, the UE1 may adjust the CPE start point #1 to the same position as the CPE start point #2 or adjust the CPE start point #1 to a position after the CPE start point #2 to ensure that the transmission of the UE2 is not blocked. If the CPE start point #1 is later than the CPE start point #2, the UE1 may not be adjusted, and the CPE start point #1 is the first CPE start point, so that the normal transmission of the UE2 may be ensured. That is, the first CPE start point determined by UE1 is the later one of CPE start point #1 and CPE start point # 2. I.e. the implementation ensures that the high priority second transmission is not blocked by the low priority first transmission.

In this implementation manner, in order to avoid transmission of the transmission block of the first terminal device and the transmission of the second terminal device, or the transmission of the transmission block of the second terminal device and the first terminal device, the first terminal device may not perform the first transmission on the first resource, and by triggering the resource reselection, both the first terminal device and the second terminal device may perform normal transmission. The third resource reselected by the first terminal device may occupy a partial RB set on another time unit (for example, a slot #p) for the first transmission of the first terminal device, that is, the third resource and the second resource do not overlap in the frequency domain, so as to avoid transmission blocking. The implementation manner of triggering the resource reselection and reporting the third resource to the MAC layer may refer to the above description, and for brevity, will not be repeated here.

As shown in fig. 13, assuming that the transmission priority of the resource reserved by UE2 in the time slot m is higher than or equal to the transmission priority of UE1, UE1 may reselect resource #3, e.g., a partial RB set, i.e., subchannel 0, in the resource selection window for the first transmission, so that the transmissions of UE1 and UE2 may proceed normally.

Before the first terminal device determines that the first CPE start point is a first preset CPE start point or a second preset CPE start point, the method further includes: the first terminal equipment receives a second reservation message, the second reservation message indicates a third resource reserved by the third terminal equipment, and the third resource coincides with at least part of frequency domain resources of the first resource on the same time unit; and the first terminal equipment determines a third CPE starting point and a third transmission priority corresponding to a third resource according to the second reservation message, wherein the third CPE starting point corresponds to the third resource. Further, the first terminal device determines the first CPE start point according to the priority of the second transmission, the second CPE start point, the priority of the third transmission, the third CPE start point and the priority of the first transmission.

Illustratively, considering that the second CPE start point and the third CPE start point may be the second preset CPE start point determined according to the above-described manner (2) or (3), the first CPE start point determined by the UE1 may also be the second preset CPE start point. Assuming that the transmission priority of UE1 in the time slot m is higher than that of UE2 and lower than that of UE3, UE1 determines that CPE start point #3 is earlier than CPE start point #2 and CPE start point #1 is later than or equal to CPE start point #2, UE1 may not be adjusted, so that UE3 with high priority may transmit normally. If the UE1 determines that the CPE start point #2 is earlier than the CPE start point #3 and the CPE start point #1 is later than the CPE start point #2, the UE1 may adjust the CPE start point #1 to the same position as the CPE start point #2 or adjust the CPE start point #1 to a position before the CPE start point #2 so that the transmission of the UE1 may be performed normally.

It should be appreciated that the above-described implementations provide that the first terminal device determines the first CPE start point according to the priority of the second transmission, the second CPE start point, and the priority of the first transmission, in the case that the first terminal device does not send the reservation message.

Alternatively, if the first terminal device does not perceive the reservation message of the second terminal device in the above step S1110, the first terminal device may determine the first CPE starting point according to the above manner (1) according to the partial RB set resource occupied by itself.

Alternatively, if the first terminal device sends a reservation message to the other terminal device before the first transmission is performed, the first terminal device may determine the first CPE start point for the first transmission according to the partial RB set resource occupied by itself according to the above manner (1), and the first terminal device may not perform the steps of the method 1100, where the second terminal device may default to perform the above processing, that is, the second terminal device determines the second CPE start point according to the first CPE start point, the priority of the first transmission, and the priority of the second transmission. The specific implementation manner of determining the starting point of the second CPE by the second terminal device may refer to the description related to the first terminal device determining the starting point of the first CPE in the above case 1, and for brevity, the description is not repeated here.

Aiming at the scene that the first terminal equipment reserves a partial RB set resource (namely a first resource), and the second terminal equipment selects a full RB set resource (namely a second resource), the first terminal equipment can determine the starting point of the first CPE as a second preset CPE starting point, so long as blocking caused by transmission of UE1 and other UEs is avoided. For example, in the case that the second CPE start point is earlier than the first preset CPE start point, the first terminal device may determine that the first CPE start point is the second preset CPE start point.

In other words, since the CPE start point #1 is the first preset CPE start point in the above manner (1), in the case that the second CPE start point is determined to be earlier than the first preset CPE start point, that is, the second CPE start point is earlier than the CPE start point #1, in order to avoid the block between the two, the second preset CPE start point may be determined as the first CPE start point according to the above manner (2) or (3), and the first CPE start point is the second preset CPE start point, so that the UE1 may perform transmission normally. In this implementation, the first 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.

It should be noted that, the above implementations are only examples given for understanding the solution, and should not constitute any limitation on the technical solution of the present application.

The communication method side embodiment of the present application is described in detail above with reference to fig. 1 to 13, and the communication apparatus side embodiment of the present application will be described in detail below with reference to fig. 14 and 15. It is to be understood that the description of the device embodiments corresponds to the description of the method embodiments, and that parts not described in detail can therefore be seen in the preceding method embodiments.

Fig. 14 is a schematic block diagram of a communication apparatus 1000 provided in an embodiment of the present application. As shown in fig. 14, the apparatus 1000 may include a transceiver unit 1010 and a processing unit 1020. The transceiver unit 1010 may communicate with the outside, and the processing unit 1020 is configured to perform data processing, and the transceiver unit 1010 may also be referred to as a communication interface or a transceiver unit.

In one possible design, the apparatus 1000 may implement steps or flows corresponding to those performed by the first terminal device (e.g., UE 1) in the above method embodiment, where the processing unit 1020 is configured to perform the operations related to the processing of the first terminal device in the above method embodiment, and the transceiver unit 1010 is configured to perform the operations related to the transceiving of the first terminal device in the above method embodiment.

It should be understood that the device 1000 herein is embodied in the form of functional units. The term "unit" herein may refer to an application specific integrated circuit (application specific integrated circuit, ASIC), an electronic circuit, a processor (e.g., a shared, dedicated, or group processor, etc.) and memory that execute one or more software or firmware programs, a combinational logic circuit, and/or other suitable components that support the described functionality. In an alternative example, it will be understood by those skilled in the art that the apparatus 1000 may be specifically configured to perform the respective processes and/or steps corresponding to the transmitting end in the foregoing method embodiment, or the apparatus 1000 may be specifically configured to be configured to perform the respective processes and/or steps corresponding to the receiving end in the foregoing method embodiment, which are not repeated herein.

The apparatus 1000 of each of the above-described aspects has a function of implementing the corresponding step performed by the transmitting end in the above-described method, or the apparatus 1000 of each of the above-described aspects has a function of implementing the corresponding step performed by the receiving end in the above-described method. The functions may be implemented by hardware, or may be implemented by hardware executing corresponding software. The hardware or software comprises one or more modules corresponding to the functions; for example, the transceiver unit may be replaced by a transceiver (e.g., a transmitting unit in the transceiver unit may be replaced by a transmitter, a receiving unit in the transceiver unit may be replaced by a receiver), and other units, such as a processing unit, etc., may be replaced by a processor, to perform the transceiver operations and related processing operations in the various method embodiments, respectively.

The transceiver unit may be a transceiver circuit (for example, may include a receiving circuit and a transmitting circuit), and the processing unit may be a processing circuit. In the embodiment of the present application, the apparatus in fig. 14 may be the receiving end or the transmitting end in the foregoing embodiment, or may be a chip or a chip system, for example: system on chip (SoC). The transceiver unit may be an input/output circuit or a communication interface. The processing unit is an integrated processor or microprocessor or integrated circuit on the chip. And are not limited herein.

Fig. 15 shows a schematic block diagram of a communication device 2000 provided by an embodiment of the present application. As shown in fig. 15, the apparatus 2000 includes a processor 2010 and a transceiver 2020. Wherein the processor 2010 and the transceiver 2020 are in communication with each other via an internal connection, the processor 2010 is configured to execute instructions to control the transceiver 2020 to transmit signals and/or receive signals.

Optionally, the apparatus 2000 may further include a memory 2030, where the memory 2030 communicates with the processor 2010 and the transceiver 2020 through an internal connection. The memory 2030 is for storing instructions and the processor 2010 may execute the instructions stored in the memory 2030.

In a possible implementation manner, the apparatus 2000 is configured to implement each flow and step corresponding to the first terminal device (for example, UE 1) in the foregoing method embodiment.

It should be understood that the device 2000 may be specifically a transmitting end or a receiving end in the foregoing embodiments, and may also be a chip or a chip system. Correspondingly, the transceiver 2020 may be a transceiver circuit of the chip, which is not limited herein. Specifically, the apparatus 2000 may be configured to perform each step and/or flow corresponding to the sending end or the receiving end in the above method embodiments.

Alternatively, 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. For example, the memory may also store information of the device type. The processor 2010 may be configured to execute instructions stored in a memory, and when the processor 2010 executes the instructions stored in the memory, the processor 2010 is configured to perform the steps and/or processes of the method embodiments corresponding to the transmitting side or the receiving side described above.

In implementation, the steps of the above method may be performed by integrated logic circuits of hardware in a processor or by instructions in the form of software. The steps of a method disclosed in connection with the embodiments of the present application may be embodied directly in a hardware processor for execution, or in a combination of hardware and software modules in the processor for execution. The software modules may be located in a random access memory, flash memory, read only memory, programmable read only memory, or electrically erasable programmable memory, registers, etc. as well known in the art. The storage medium is located in a memory, and the processor reads the information in the memory and, in combination with its hardware, performs the steps of the above method. To avoid repetition, a detailed description is not provided herein.

It should be noted that the processor in the embodiments of the present application may be an integrated circuit chip with signal processing capability. In implementation, the steps of the above method embodiments may be implemented by integrated logic circuits of hardware in a processor or instructions in software form. The 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, a discrete hardware component. The processor in the embodiments of the present application may implement or execute the methods, steps and logic blocks disclosed in the embodiments of the present application. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like. The steps of a method disclosed in connection with the embodiments of the present application may be embodied directly in hardware, in a decoded processor, or in a combination of hardware and software modules in a decoded processor. The software modules may be located in a random access memory, flash memory, read only memory, programmable read only memory, or electrically erasable programmable memory, registers, etc. as well known in the art. The storage medium is located in a memory, and the processor reads the information in the memory and, in combination with its hardware, performs the steps of the above method.

It will be appreciated that the memory in embodiments of the present application may be either volatile memory or nonvolatile memory, or may include both volatile and nonvolatile memory. The nonvolatile memory may be a read-only memory (ROM), a Programmable ROM (PROM), an Erasable PROM (EPROM), an electrically Erasable EPROM (EEPROM), or a flash memory. The volatile memory may be random access memory (random access memory, RAM) which acts as an external cache. By way of example, and not limitation, many forms of RAM are available, such as Static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), double data rate SDRAM (DDR SDRAM), enhanced SDRAM (ESDRAM), synchronous DRAM (SLDRAM), and direct memory bus RAM (DR RAM). It should be noted that the memory of the systems and methods described herein is intended to comprise, without being limited to, these and any other suitable types of memory.

Fig. 16 is a schematic block diagram of a chip system 3000 provided in an embodiment of the present application. As shown in fig. 16, the system-on-chip 3000 (or may also be referred to as a processing system) includes logic 3010 and input/output interface 3020.

Logic 3010 may be a processing circuit in system-on-chip 3000. Logic 3010 may be coupled to a memory unit to invoke instructions in the memory unit so that system-on-chip 3000 may implement the methods and functions of embodiments of the present application. The input/output interface 3020 may be an input/output circuit in the chip system 3000, outputting information processed by the chip system 3000, or inputting data or signaling information to be processed into the chip system 3000 for processing.

As an aspect, the chip system 3000 is configured to implement the operations performed by the terminal device in the above method embodiments.

For example, the logic circuit 3010 is configured to implement the processing-related operation performed by the first terminal device in the above method embodiment, such as the processing-related operation performed by the first terminal device in the embodiment shown in fig. 4, or the processing-related operation performed by the first terminal device in the embodiment shown in fig. 6, or the processing-related operation performed by the first terminal device in the embodiment shown in fig. 11; the input/output interface 3020 is used to implement the above operations related to transmission and/or reception performed by the first terminal device in the method embodiment, such as the operations related to transmission and/or reception performed by the first terminal device in the embodiment shown in fig. 4, or the operations related to transmission and/or reception performed by the first terminal device in the embodiment shown in fig. 6, or the operations related to transmission and/or reception performed by the first terminal device in the embodiment shown in fig. 11.

For another example, the logic circuit 3010 is configured to implement the operation related to the process performed by the second terminal device in the embodiment of the method described above, such as the operation related to the process performed by the second terminal device in the embodiment shown in fig. 4, or the operation related to the process performed by the second terminal device in the embodiment shown in fig. 6, or the operation related to the process performed by the second terminal device in the embodiment shown in fig. 11; the input/output interface 3020 is used to implement the above operations related to transmission and/or reception performed by the second terminal device in the method embodiment, such as the operations related to transmission and/or reception performed by the second terminal device in the embodiment shown in fig. 4, or the operations related to transmission and/or reception performed by the second terminal device in the embodiment shown in fig. 6, or the operations related to transmission and/or reception performed by the second terminal device in the embodiment shown in fig. 11.

The embodiments of the present application also provide a computer readable storage medium having stored thereon computer instructions for implementing the method performed by a terminal device (e.g., a first terminal device, and also e.g., a second terminal device) in the above method embodiments.

The embodiments of the present application also provide a computer program product containing instructions that, when executed by a computer, implement the method performed by a terminal device (e.g., a first terminal device, and also e.g., a second terminal device) in the above method embodiments.

The embodiment of the application also provides a communication system, which comprises the first terminal device and the second terminal device in the above embodiments.

The explanation and beneficial effects of the related content in any of the above-mentioned devices can refer to the corresponding method embodiments provided above, and are not repeated here.

Those of ordinary skill in the art will appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the solution. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present application.

It will be clear to those skilled in the art that, for convenience and brevity of description, specific working procedures of the above-described systems, apparatuses and units may refer to corresponding procedures in the foregoing method embodiments, and are not repeated herein.

In the several embodiments provided in this application, it should be understood that the disclosed systems, devices, and methods may be implemented in other manners. For example, the apparatus embodiments described above are merely illustrative, e.g., the division of the units is merely a logical function division, and there may be additional divisions when actually implemented, e.g., multiple units or components may be combined or integrated into another system, or some features may be omitted or not performed. Alternatively, the coupling or direct coupling or communication connection shown or discussed with each other may be an indirect coupling or communication connection via some interfaces, devices or units, which may be in electrical, mechanical or other form.

The units described as separate units may or may not be physically separate, and units shown as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

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

The functions, if implemented in the form of software functional units and sold or used as a stand-alone product, may be stored in a computer-readable storage medium. Based on such understanding, the technical solution of the present application may be embodied essentially or in a part contributing to the prior art or in a part of the technical solution, in the form of a software product stored in a storage medium, including several instructions for causing a computer device (which may be a personal computer, a server, or an apparatus, etc.) to perform all or part of the steps of the method described in the embodiments of the present application. And the aforementioned storage medium includes: various media capable of storing program codes, such as a U disk, a mobile hard disk, a read-only memory, a random access memory, a magnetic disk or an optical disk.

The foregoing is merely specific embodiments of the present application, but the scope of the present application is not limited thereto, and any person skilled in the art can easily think about changes or substitutions within the technical scope of the present application, and the changes and substitutions are intended to be covered by the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims

1. A method of communication, comprising:

the first terminal equipment receives a reservation message, wherein the reservation message indicates a second resource reserved by the second terminal equipment;

the first terminal equipment determines a second cyclic prefix extension CPE length according to the reservation message, wherein the second CPE length corresponds to the second resource;

the first terminal equipment determines a 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 a priority of a first transmission of the first terminal device, and the first CPE length corresponds to a first resource, where the first resource is a resource that the first terminal device has selected for the first transmission, the first resource coincides with at least a part of time domain resources of the second resource, and part or all of resources of the third resource are used for the first transmission by the first terminal device.

2. The method of claim 1, wherein the first terminal device determining a third resource or adjusting the first CPE length according to a first CPE length and the second CPE length comprises:

and under the condition that the first CPE length is smaller than the second CPE length, the first terminal equipment determines the third resource.

3. The method according to claim 2, wherein the first terminal device determining the third resource in case the first CPE length is smaller than the second CPE length comprises:

and the first terminal equipment determines the third resource under the condition that the first CPE length is smaller than the second CPE length and the first resource is overlapped with at least part of frequency domain resources of the second resource.

4. A method according to any of claims 1 to 3, wherein the first terminal device determining a third resource or adjusting the first CPE length based on a first CPE length and the second CPE length comprises:

and under the condition that the first CPE length is equal to the second CPE length, the first resource coincides with at least part of frequency domain resources of the second resource, and the received power RSRP of the reference signal of the reservation message is higher than a first threshold value, the first terminal equipment determines the third resource.

5. The method according to any of claims 1 to 4, wherein the first terminal device determining a third resource or adjusting the first CPE length based on a first CPE length and the second CPE length comprises:

the first terminal equipment adjusts the first CPE length of the first terminal equipment on a first time unit to be a third CPE length according to the first CPE length and the second CPE length, wherein the first time unit is a time domain resource of the superposition part of the first resource and the second resource, and the third CPE length is larger than or equal to the second CPE length.

6. The method according to any one of claims 1 to 5, further comprising:

the first terminal equipment determines a fourth CPE length according to the reservation message, wherein the fourth CPE length corresponds to a fourth resource, and the fourth CPE length is larger than the second CPE length;

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, including:

the first terminal equipment adjusts the first CPE length of the first terminal equipment on a first time unit to be a third CPE length according to the first CPE length, the fourth CPE length and the second CPE length, wherein the first time unit is a time domain resource of the superposition part of the first resource and the second resource, and the third CPE length is larger than or equal to the fourth CPE length.

7. The method according to claim 5 or 6, wherein the first terminal device adjusting the first CPE length of the first terminal device to a third CPE length over a first time unit according to the first CPE length and the second CPE length, comprising:

and when the first CPE length is greater than or less than the second CPE length, the first resource coincides with at least part of the frequency domain resource of the second resource, and the RSRP of the reservation message is lower than a first threshold, the first terminal device adjusts the first CPE length on the first time unit to be the third CPE length.

8. The method according to any of claims 5 to 7, wherein the first terminal device adjusting the first CPE length of the first terminal device over the first time unit to a third CPE length according to the first CPE length and a second CPE length, comprising:

and when 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 are not overlapped, the first terminal equipment adjusts the first CPE length on the first time unit to be the third CPE length.

9. The method according to any of claims 1 to 8, wherein the second CPE length is determined according to a priority of a transmission corresponding to the second resource; or, the second CPE length is determined according to the CPE length occupied by the subscription message.

10. A method of communication, comprising:

the first terminal equipment determines a candidate resource set according to a first CPE length and the second CPE length, part or all of resources of the candidate resource set are used for first transmission by the first terminal equipment, and the first CPE length is determined according to the priority of the first transmission of the first terminal equipment.

11. The method of claim 10, wherein the first terminal device determining the candidate resource set based on the first CPE length and the second CPE length comprises:

and under the condition that the length of the first CPE is smaller than that of the second CPE, the first terminal equipment excludes third resources to obtain the candidate resource set, wherein the third resources are frequency domain resources on a time unit where the second resources are located.

12. The method according to claim 10 or 11, wherein the first terminal device determining a candidate resource set according to a first CPE length and the second CPE length comprises:

the first terminal device takes a fourth resource as the candidate resource set under the condition that the first CPE length is greater than or equal to the second CPE length;

wherein the fourth resource comprises:

resources on a first time unit, wherein the first time unit is not overlapped with a time unit where the second resources are located; and/or the number of the groups of groups,

and part or all of the resources on the time unit where the second resource is located.

13. The method according to claim 10 or 11, wherein the first terminal device determining a candidate resource set according to a first CPE length and the second CPE length comprises:

and under the condition that the length of the first CPE is equal to the length of the second CPE and the received power RSRP of the reference signal of the reservation message is higher than a first threshold value, the first terminal equipment excludes resources which at least partially coincide with the second resources, and the candidate resource set is obtained.

14. The method according to claim 12, wherein the method further comprises:

The first terminal equipment determines a third CPE length according to the reservation message, wherein the third CPE length corresponds to a third resource, the third CPE length is smaller than the second CPE length, and the third resource and the second resource are located in the same time unit.

15. The method according to any one of claims 10 to 14, wherein,

the candidate resource set comprises a first candidate resource subset and/or a second candidate resource subset, wherein the length of a second CPE corresponding to the resources in the first candidate resource subset is equal to the length of the first CPE, and the length of the second CPE corresponding to the resources in the second candidate resource subset is smaller than the length of the first CPE.

16. The method according to any one of claims 10 to 15, wherein,

the candidate resource set comprises a third candidate resource subset, a second CPE length corresponding to the resources in the third candidate resource subset is equal to the first CPE length, the resources in the third candidate resource subset are resources on a first time unit, and the first time unit is not overlapped with a time unit where the second resources are located.

17. The method according to any one of claims 10 to 16, further comprising:

In case the candidate resource set cannot meet the requirement of the first transmission of the first terminal device, the first terminal device increases the first CPE length;

the first terminal device determines a candidate resource set according to a first CPE length and the second CPE length, including:

and the first terminal equipment determines the candidate resource set according to the increased first CPE length and the increased second CPE length.

18. The method of claim 17, wherein the set of candidate resources fails to meet the first transmission requirement of the first terminal device, comprising one or more of:

the number of time units in which the candidate resources in the candidate resource set are located is lower than a second threshold; or,

the number of candidate resources in the set of candidate resources is below a third threshold.

19. The method according to any of claims 10 to 18, wherein the second CPE length is determined according to a priority of a transmission corresponding to the second resource; or, the second CPE length is determined according to the CPE length occupied by the subscription message.

20. A communications apparatus, the apparatus comprising a processor coupled with a memory storing instructions that, when executed by the processor, cause the processor to perform the method of any of claims 1-19.

21. A communication device comprising logic circuitry for coupling with an input/output interface through which data is transmitted to perform the method of any of claims 1 to 19.

22. A chip, comprising: a processor for calling and running a computer program from a memory, causing a communication device on which the chip is mounted to perform the method of any one of claims 1 to 19.

23. A computer readable storage medium for storing a computer program which, when run on a computer, causes the computer to perform the method of any one of claims 1 to 19.

24. A computer program product, the computer program product comprising: computer program code which, when executed, implements the method of any one of claims 1 to 19.