WO2023141955A1 - 边链路传输方法以及装置 - Google Patents

边链路传输方法以及装置 Download PDF

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WO2023141955A1
WO2023141955A1 PCT/CN2022/074648 CN2022074648W WO2023141955A1 WO 2023141955 A1 WO2023141955 A1 WO 2023141955A1 CN 2022074648 W CN2022074648 W CN 2022074648W WO 2023141955 A1 WO2023141955 A1 WO 2023141955A1
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resource
cot
candidate
side link
channel
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PCT/CN2022/074648
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English (en)
French (fr)
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张健
蒋琴艳
李国荣
王昕�
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富士通株式会社
张健
蒋琴艳
李国荣
王昕�
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Priority to PCT/CN2022/074648 priority Critical patent/WO2023141955A1/zh
Publication of WO2023141955A1 publication Critical patent/WO2023141955A1/zh

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management

Definitions

  • the embodiment of the present application relates to the technical field of communications.
  • NR sidelink sidelink
  • V2X Vehicle to Everything
  • the sending device communicates directly with the receiving device through a side link (sidelink).
  • the NR sidelink performs sidelink communication in the resource pool.
  • the defined physical channels include physical sidelink control channel (PSCCH, Physical Sidelink Control Channel), physical sidelink shared channel (PSSCH, Physical Sidelink Shared Channel) and physical sidelink Feedback Channel (PSFCH, Physical Sidelink Feedback Channel).
  • PSCCH carries 1st stage side link control information (SCI, Sidelink Control Information), and the 1st stage SCI is mainly used to reserve resources.
  • PSSCH carries 2nd stage SCI and data, and 2nd stage SCI is mainly used for data demodulation.
  • PSFCH carries side link feedback information (HARQ-ACK).
  • NR sidelink defines two resource allocation modes.
  • mode 1 the resources used by the terminal device for side link communication are scheduled or configured by the network device (base station) through the NR Uu link.
  • mode 2 the terminal device can autonomously select time-frequency resources for side link communication based on its own perception results.
  • SL-U is mainly used in business scenarios, but it does not rule out V2X with a high degree of automation.
  • high data rate is an indispensable and important indicator of XR technologies such as virtual reality VR (Virtual Reality) and augmented reality AR (Augmented Reality).
  • SL-U can meet the high rate requirement by using additional spectrum.
  • industrial IoT and smart home are also suitable scenarios for deploying and using SL-U.
  • SL-U has just been approved in Rel-18, and the specific standardization work has not yet started in 3GPP. At present, how to perform side link transmission based on resource allocation mode 2 (autonomous resource selection) in SL-U is still an open problem.
  • embodiments of the present application provide a side link transmission method and device.
  • a side link transmission method including:
  • the first device determines the candidate resource set according to the channel occupancy time on the unlicensed frequency band
  • the side link information is sent on the transmission resource.
  • a side link transmission device including:
  • a determining unit which determines the candidate resource set according to the channel occupancy time on the unlicensed frequency band
  • a selection unit which selects a transmission resource in the set of candidate resources
  • a sending unit which sends side link information on the sending resource in the case that the side link sending is successful in listening before sending.
  • a communication system including:
  • a terminal device which determines a candidate resource set according to channel occupancy time on an unlicensed frequency band; selects a transmission resource from the candidate resource set; Send side link information on the resource.
  • One of the beneficial effects of the embodiment of the present application is: determine the candidate resource set according to the channel occupancy time (COT) on the unlicensed frequency band, and select the transmission resource in the candidate resource set; and when the LBT sent for the side link is successful , to send side link information on the sending resource.
  • COT channel occupancy time
  • Fig. 1 is the schematic diagram of the communication system of the embodiment of the present application.
  • FIG. 2 is a schematic diagram of COT sharing
  • Fig. 3 is a schematic diagram of sending based on interleaving (interlace);
  • FIG. 4 is a schematic diagram of a side link transmission method according to an embodiment of the present application.
  • FIG. 5 is an example diagram of resource selection in the embodiment of the present application.
  • FIG. 6 is a schematic diagram of a device sharing COT according to an embodiment of the present application.
  • FIG. 7 is a schematic diagram of resource selection in an embodiment of the present application.
  • FIG. 8 is another schematic diagram of resource selection in the embodiment of the present application.
  • FIG. 9 is a schematic diagram of a sidelink transmission device according to an embodiment of the present application.
  • FIG. 10 is a schematic diagram of a network device according to an embodiment of the present application.
  • FIG. 11 is a schematic diagram of a terminal device according to an embodiment of the present application.
  • the terms “first”, “second”, etc. are used to distinguish different elements from the title, but do not indicate the spatial arrangement or time order of these elements, and these elements should not be referred to by these terms restricted.
  • the term “and/or” includes any and all combinations of one or more of the associated listed items.
  • the terms “comprising”, “including”, “having” and the like refer to the presence of stated features, elements, elements or components, but do not exclude the presence or addition of one or more other features, elements, elements or components.
  • the term “communication network” or “wireless communication network” may refer to a network conforming to any of the following communication standards, such as Long Term Evolution (LTE, Long Term Evolution), Enhanced Long Term Evolution (LTE-A, LTE- Advanced), Wideband Code Division Multiple Access (WCDMA, Wideband Code Division Multiple Access), High-Speed Packet Access (HSPA, High-Speed Packet Access), etc.
  • LTE Long Term Evolution
  • LTE-A Long Term Evolution
  • LTE-A Long Term Evolution-A
  • LTE- Advanced Wideband Code Division Multiple Access
  • WCDMA Wideband Code Division Multiple Access
  • High-Speed Packet Access High-Speed Packet Access
  • the communication between devices in the communication system can be carried out according to any stage of communication protocols, such as but not limited to the following communication protocols: 1G (generation), 2G, 2.5G, 2.75G, 3G, 4G, 4.5G and 5G , New Radio (NR, New Radio), etc., and/or other communication protocols that are currently known or will be developed in the future.
  • Network device refers to, for example, a device in a communication system that connects a terminal device to a communication network and provides services for the terminal device.
  • Network equipment may include but not limited to the following equipment: base station (BS, Base Station), access point (AP, Access Point), transmission and reception point (TRP, Transmission Reception Point), broadcast transmitter, mobile management entity (MME, Mobile Management Entity), gateway, server, radio network controller (RNC, Radio Network Controller), base station controller (BSC, Base Station Controller) and so on.
  • the base station may include but not limited to: Node B (NodeB or NB), evolved Node B (eNodeB or eNB), and 5G base station (gNB), etc., and may also include Remote Radio Head (RRH, Remote Radio Head) , Remote Radio Unit (RRU, Remote Radio Unit), relay (relay) or low-power nodes (such as femeto, pico, etc.).
  • Node B Node B
  • eNodeB or eNB evolved Node B
  • gNB 5G base station
  • RRH Remote Radio Head
  • RRU Remote Radio Unit
  • relay relay
  • low-power nodes such as femeto, pico, etc.
  • base station may include some or all of their functions, each base station may provide communication coverage for a particular geographic area.
  • the term "cell” can refer to a base station and/or its coverage area depending on the context in which the term is used.
  • the term "User Equipment” (UE, User Equipment) or “terminal equipment” (TE, Terminal Equipment or Terminal Device), for example, refers to a device that accesses a communication network through a network device and receives network services.
  • a terminal device may be fixed or mobile, and may also be called a mobile station (MS, Mobile Station), terminal, subscriber station (SS, Subscriber Station), access terminal (AT, Access Terminal), station, etc.
  • the terminal equipment may include but not limited to the following equipment: Cellular Phone (Cellular Phone), Personal Digital Assistant (PDA, Personal Digital Assistant), wireless modem, wireless communication equipment, handheld equipment, machine type communication equipment, laptop computer, Cordless phones, smartphones, smart watches, digital cameras, and more.
  • Cellular Phone Cellular Phone
  • PDA Personal Digital Assistant
  • wireless modem wireless communication equipment
  • handheld equipment machine type communication equipment
  • laptop computer Cordless phones
  • Cordless phones smartphones, smart watches, digital cameras, and more.
  • the terminal device can also be a machine or device for monitoring or measurement, such as but not limited to: a machine type communication (MTC, Machine Type Communication) terminal, Vehicle communication terminal, device to device (D2D, Device to Device) terminal, machine to machine (M2M, Machine to Machine) terminal, etc.
  • MTC Machine Type Communication
  • Vehicle communication terminal device to device (D2D, Device to Device) terminal
  • M2M Machine to Machine
  • network side refers to a side of the network, which may be a certain base station, or may include one or more network devices as above.
  • user side or “terminal side” or “terminal device side” refers to a side of a user or a terminal, which may be a certain UE, or may include one or more terminal devices as above.
  • device may refer to network devices or terminal devices.
  • FIG. 1 is a schematic diagram of a communication system according to an embodiment of the present application, schematically illustrating a case where a terminal device and a network device are taken as examples.
  • a communication system 100 may include a network device 101 and terminal devices 102 and 103.
  • FIG. 1 only uses two terminal devices and one network device as an example for illustration, but this embodiment of the present application is not limited thereto.
  • eMBB enhanced mobile broadband
  • mMTC massive machine type communication
  • URLLC Ultra-Reliable and Low -Latency Communication
  • Fig. 1 shows that both terminal devices 102 and 103 are within the coverage of the network device 101, but the present application is not limited thereto. Neither of the two terminal devices 102 , 103 may be within the coverage of the network device 101 , or one terminal device 102 may be within the coverage of the network device 101 while the other terminal device 103 is outside the coverage of the network device 101 .
  • side link transmission can be performed between two terminal devices 102 and 103 .
  • the two terminal devices 102 and 103 may both perform side link transmission within the coverage of the network device 101 to implement side link communication, or both may perform side link transmission outside the coverage of the network device 101 to implement side link communication.
  • one terminal device 102 may be within the coverage of the network device 101 while the other terminal device 103 is outside the coverage of the network device 101 to perform side link transmission to realize side link communication.
  • 3GPP has carried out standardization research and project establishment on both sidelink and unlicensed frequency bands, such as Rel-16's NR V2X, Rel-17's sidelink enhancement (enhancement), and Rel-16's NR-U (NR-Unlicensed).
  • sidelink and unlicensed frequency bands such as Rel-16's NR V2X, Rel-17's sidelink enhancement (enhancement), and Rel-16's NR-U (NR-Unlicensed).
  • NR sidelink defines two resource allocation modes: mode 1 (mode 1) and mode 2 (mode 2).
  • mode 1 mode 1
  • mode 2 mode 2
  • Table 1 The complete resource selection process can be found in Section 8.1.4 of Standard TS 38.214.
  • 3GPP has further enhanced the resource allocation of NR sidelink in Rel-17, including power saving (power saving) and inter-UE coordination (inter-UE coordination), and the application scenarios have also been extended to public safety (public safety) and business-related services .
  • NR-U New Radio-Unlicensed
  • LBT Listen Before Talk
  • COT channel occupancy time
  • COT sharing COT sharing
  • LBT LBT Level 1
  • Cat2 LBT LBT Level 2
  • Cat4 LBT LBT Level 4
  • Cat1 LBT can not perform channel detection.
  • Cat2 LBT includes Cat2 16 ⁇ s LBT and Cat2 25 ⁇ s LBT, and a 16 ⁇ s and 25 ⁇ s channel detection is required before sending data.
  • Cat4 LBT consists of multiple channel detections with a variable number of times. The higher the level of LBT, the stricter the conditions for LBT success.
  • the equipment can share the COT obtained by the base station (equipment), which is called COT sharing.
  • Devices or base stations can use low-level LBT when sharing COT, so as to avoid using the highest-level LBT for each transmission, and obtain the effect of reducing transmission delay.
  • FIG. 2 is a schematic diagram of COT sharing, which schematically illustrates COT sharing.
  • the base station occupies the channel through Cat4 LBT, sends downlink data, and sends a COT indication, that is, initiates COT.
  • the COT indication may indicate the COT duration, the LBT bandwidth supported in the COT, the uplink and downlink data structures in the COT, and the like.
  • the base station can instruct the device to transmit data through Cat1 LBT. If the time interval between the uplink transmission of the device and the previous downlink transmission of the base station is equal to 16 ⁇ s or 25 ⁇ s, the base station can instruct the device to transmit data through Cat2 16 ⁇ s LBT or Cat2 25 ⁇ s LBT. If the device knows that it is within the COT initiated by the base station based on the COT indication, the device can also adjust the LBT level of uplink transmission according to the time interval of uplink and downlink data, for example, from Cat4 LBT to Cat2 LBT.
  • LBT grades can include, for example, Cat1 LBT (LBT grade 1), Cat2 LBT (LBT grade 2) and Cat4 LBT (LBT grade 4), or, for example, can include class 1 and class 2, etc., or, for example, can include type A, type B, type C, type D, etc., the embodiment of this application does not limit the specific form of expression.
  • Fig. 3 is a schematic diagram of transmission based on interleaving (interlace), which schematically illustrates interlace.
  • an interleaving includes several discrete resource blocks (RB, Resource Block) in the frequency domain, and the discrete RBs are distributed at equal intervals in the frequency domain.
  • One transmission can use one or more interleaves.
  • the Channel Access Priority Class (CAPC, Channel Access Priority Class) is used to determine the relevant parameters required for the LBT process, such as the maximum channel occupation time, the length of the contention window, etc.
  • Table 2 schematically illustrates uplink channel access priorities. The smaller the CAPC value p, the higher the channel access priority. The device needs to know which CAPC value to use when performing Cat4 LBT.
  • sidelink and “V2X” are interchangeable
  • PSFCH and “sidelink feedback channel” are interchangeable
  • PSCCH and “Sidelink Control Channel” or “Sidelink Control Information” are interchangeable
  • PSSCH and “Sidelink Data Channel” or “Sidelink Data” are also interchangeable.
  • sending (transmitting) or receiving (receiving) PSCCH can be understood as sending or receiving side link control information carried by PSCCH; sending or receiving PSSCH can be understood as sending or receiving side link data carried by PSSCH; sending or receiving PSFCH can be understood as sending or receiving side link feedback information carried by PSFCH.
  • Sidelink transmission (Sidelink transmission, also referred to as sidelink transmission) can be understood as PSCCH/PSSCH transmission or sidelink data/information transmission.
  • the time unit can have any length of time, for example, it can be a frame (frame), a sub-frame (sub-frame), a time slot (slot), a mini-slot (mini-slot), etc.
  • the slot is used as an example for illustration;
  • PSCCH/PSSCH can also be referred to as PSSCH for short, and
  • SCI can refer to 1st stage SCI and/or 2nd stage SCI;
  • side link information includes side link control information and/or data information and/or feedback information.
  • An embodiment of the present application provides a side link transmission method, which is described first from the side of the first device.
  • FIG. 4 is a schematic diagram of a side link transmission method according to an embodiment of the present application. As shown in FIG. 4, the method includes:
  • the first device determines a candidate resource set according to a channel occupancy time (COT) on an unlicensed frequency band;
  • COT channel occupancy time
  • the first device selects a transmission resource from the candidate resource set
  • the first device sends side link information on the sending resource when the listen before sending (LBT) for side link sending succeeds.
  • LBT listen before sending
  • the Channel Occupancy Time is obtained from the COT indication received by the first device.
  • the second device or the third device or the fourth device described later
  • the channel occupancy time (COT) is obtained by the first device performing listen-before-talk (LBT).
  • LBT listen-before-talk
  • the first device can obtain COT by successfully performing Cat4 LBT by itself.
  • Cat4 LBT listen-before-talk
  • the first device sends a COT indication including information of a channel occupancy time (COT). For example, after the first device successfully obtains the COT through its own Cat4 LBT, it can send side link information in the COT through the resource selection process, and the first device can also send a COT indication including the COT information to other devices.
  • COT channel occupancy time
  • the resource selection window used to determine the set of candidate resources is determined based on channel occupancy time (COT). For example, within the first resource selection window determined according to information including Packet Delay Budget (PDB, Packet Delay Budget), the first device determines one or more second resource selection windows according to channel occupancy time (COT).
  • COT channel occupancy time
  • Fig. 5 is an example diagram of resource selection in the embodiment of the present application.
  • a high layer of the device such as the MAC layer
  • the resource selection window is determined according to the information including the PDB, for example, as shown in n+T1 and n+T2 of the first resource selection window in Figure 5.
  • the resource selection window is determined according to the COT, for example, resource selection window 1 , resource selection window 2 , and resource selection window 3 shown in FIG. 5 .
  • the first resource selection window may include a plurality of second resource selection windows (ie, resource selection window 1, resource selection window 2, and resource selection window 3).
  • the candidate resource set is determined according to the channel occupancy time (COT) on the unlicensed frequency band, and the transmission resource is selected in the candidate resource set; Send side link information.
  • COT channel occupancy time
  • the resource selection process including determining the set of candidate resources is triggered by the first device according to a higher layer request.
  • side link resource selection process For specific content of the side link resource selection process, reference may also be made to related technologies, such as the content described in Table 1 above, which will not be repeated in this embodiment of the present application.
  • the first device receives a COT indication sent by the second device initiating the COT at the time slot nt 1 before time slot n, so as to obtain the COT.
  • the first device shares the COT through a resource selection process.
  • the first device determines a resource selection window 1 in the COT, determines a candidate resource set, and reports it to a higher layer. Higher layers select candidate resources from the candidate resource set.
  • the first device sends side link information (PSCCH/PSSCH) on the selected candidate resource.
  • the first device When the first device performs LBT in the shared COT, it can use relatively simple LBT (Cat1 LBT, Cat2 LBT). For example, the first device can obtain the transmission resources of the second device that initiated the COT by receiving the SCI (1st stage SCI and/or 2nd stage SCI). Use Cat1 LBT or Cat2 LBT.
  • the resource selection process including determining the set of candidate resources is triggered by the first device based on channel occupancy time (COT).
  • COT channel occupancy time
  • the first device receives a COT indication at time slot n+t 3 , so as to share the COT.
  • the difference between the shared COT corresponding to resource selection window 1 is that time slot n+t 3 is located after time slot n.
  • the resource selection is triggered by the COT indication received in the time slot n+t 3 , or in other words, is triggered by the obtained COT.
  • resource selection is triggered by a higher-layer request for slot n, and the already obtained COT is used in the resource selection process.
  • the first device initiates a channel air time (COT) if the LBT is successful.
  • COT channel air time
  • the first device obtains a COT at time slot n+t 2 .
  • the COT is not obtained by sharing the COT of other devices, but by successfully performing Cat4 LBT on its own.
  • the first device becomes the device that initiates the COT.
  • the first device may send side link information within the COT through a resource selection process, and the first device may send a COT indication.
  • the device may reserve resources for future transmission, and indicate the reserved resources through 1st stage SCI and/or 2nd stage SCI.
  • the resources reserved by the first device and the resources used to send the reservation indication are located within the same channel occupancy time (COT), or, the resources reserved by the first device and the resources used to send the reservation indication are within the same channel occupancy time (COT). Resources are located within the same resource selection window.
  • the resources reserved by the device are located in the current COT.
  • the device only reserves resources located within the current COT, not resources after the current COT.
  • resource selection window 1 the device performs resource selection in the shared COT (resource selection window 1), and the reserved resources are also located in the shared COT (resource selection window 1). This is also applicable to resource selection window 2 and resource selection window 3.
  • the device does not reserve resources for the next period of transmission other than the current COT.
  • FIG. 5 shows the comparison between the embodiment of the present application and the traditional resource selection process.
  • the upper layer of the device requests the physical layer to report the candidate resource set at time slot n, and the device determines the resource selection windows whose starting and ending time slots are n+T 1 and n+T 2 respectively in the remaining PDB. Select resources for sending at one time.
  • the embodiment of the present application dynamically determines the resource selection window (the second resource selection window, such as resource selection window 1, resource selection window 2, and resource selection window 3) based on the obtained COT, and in each resource selection window Select resources to send.
  • the device selects resources in a dynamic manner. Once the device obtains the COT, it sends data through resource selection within the COT.
  • This dynamic resource selection process enables devices to more actively and efficiently compete for the right to use unlicensed frequency bands, and enhances the competitiveness of devices for unlicensed frequency bands. Since the LBT in the COT can use a lower LBT level, it is easier to access the channel, which also helps the device to access the channel more efficiently.
  • selecting resources within a period of time also increases randomness, which can avoid resource collisions caused by multiple devices competing for the same resource.
  • An interlace includes several resource blocks (RBs) distributed at equal intervals in the frequency domain, which can be regarded as several consecutive RBs in a cluster (cluster) repeating at cluster intervals.
  • RBs resource blocks
  • the invention places no restrictions on which interlaces a device uses in which time slots.
  • FIG. 6 is a schematic diagram of a device sharing COT according to an embodiment of the present application. For simplicity, Figure 6 assumes that devices use the same interlace across different slots. For devices that use unlicensed frequency bands for transmission, some devices send COT indications (device 1, device 2, and device 3), and some devices do not send COT indications (device 4).
  • a device that initiates a COT sends a COT indication, and a device that shares a COT does not send a COT indication.
  • the COT indication is carried by the PSCCH/PSSCH.
  • the COT indication is carried by the 1st stage SCI.
  • the COT indication is carried by the 2nd stage SCI, and the 1st stage SCI indicates whether the 2nd stage SCI carries the COT indication.
  • FIG. 6 shows resources used for sending COT indications, and does not separately show PSCCH resources and PSSCH resources.
  • the COT indication may not be sent in all clusters, and the embodiment of the present application does not limit which clusters the COT indication is sent.
  • the COT indication at least indicates the end time of the COT, for example, indicates the time interval from the time slot indicated by the COT to the end time slot of the COT.
  • the 1st stage SCI and/or 2nd stage SCI received at time slot n at least indicate the time-frequency resources (used interlaces) that the device will actually use for transmission in a period of time in the future (including time slot n). These resources are called reserved resources.
  • a device sending a COT indication indicates resources reserved within the COT.
  • the embodiment of the present application does not limit how the device indicates the reserved resource and the time-frequency position where the reserved resource is located.
  • the time-frequency positions of the reserved resources shown in FIG. 6 are only used as an illustration, and this embodiment of the present application is not limited thereto.
  • the first device receives one or more COT indications indicating a first channel occupancy time (COT); based on the one or more first channel occupancy times (COT) and/or by performing a listen-before-send ( The channel occupancy time (COT) obtained by the LBT) determines a second channel occupancy time (COT) for obtaining the candidate resource set.
  • COT indications indicating a first channel occupancy time (COT); based on the one or more first channel occupancy times (COT) and/or by performing a listen-before-send ( The channel occupancy time (COT) obtained by the LBT) determines a second channel occupancy time (COT) for obtaining the candidate resource set.
  • a device may receive multiple COTs, however not all COTs are suitable for COT sharing.
  • the first device may screen/filter, etc. the plurality of COTs.
  • the second channel occupancy time (COT) is indicated by a COT indication sent by the second device, and the first device and the second device meet at least one of the following conditions (first condition):
  • RSRP Reference Signal Received Power
  • the distance between the first device and the second device is less than a second threshold (distance threshold);
  • the first device is a sender of side link information of the second device
  • the first device is a recipient of the side link information of the second device
  • the first device and the second device have the same cast type
  • the channel access priority level (CAPC) value of the first device is smaller than the channel access priority level (CAPC) value of the second device.
  • the LBT results of two devices are different, it is not suitable to share the COT between the two devices, so whether to share the COT can be judged according to the RSRP and/or distance between the two devices.
  • a device in a unicast pair may not be suitable for sharing a COT initiated by a device in another unicast pair. Therefore, it may be determined whether to share a COT according to whether the two devices belong to a pair of sending and receiving devices.
  • a unicast device may not be suitable for sharing a COT initiated by a broadcast device, so whether to share a COT can be judged based on whether two devices have the same cast type.
  • a device with a low channel access priority may not be suitable for sharing the COT initiated by a device with a high channel access priority. Therefore, it can be determined whether to share the COT according to the value of the channel access priority (CAPC).
  • whether to share the COT may be determined according to any combination of the above conditions.
  • Device 1 is the sender of Device 2
  • the destination ID of Device 1 is the ID that Device 2 is interested in.
  • device 1 is the sender of unicast
  • device 2 is the receiver of unicast.
  • both device 1 and device 2 are members of the same group in the multicast, and the destination ID of device 1 is the group ID (group ID).
  • group ID group ID
  • the device can determine a COT that can be used for sharing among all received COTs.
  • the device receiving the COT indication is referred to as the first device (that is, the device sharing the COT).
  • the device that sends the COT indication is called the second device (that is, the device that initiates the COT).
  • the second device is also referred to as a COT-indicating device.
  • the first device receives M COT indications sent by M second devices, and obtains M first COTs, where M ⁇ 1.
  • the first device determines N second COTs (that is, shared COTs) among the M first COTs, where 1 ⁇ N ⁇ M.
  • the first device may obtain the information required for judging the condition in the following manner.
  • the RSRP is equal to the RSRP of the PSCCH/PSSCH carrying the COT indication.
  • the 2nd stage SCI may indicate a zone ID (Zone ID), whereby the first device can calculate the distance to the second device.
  • the 2nd stage SCI can indicate Source ID and Destination ID, so that the first device can determine whether the second device is its receiver or sender.
  • the cast type indicator field of the 2nd stage SCI indicates the cast type, so that the first device can obtain the cast type of the second device.
  • the first device may also obtain the cast type of the second device based on the format of the 2nd stage SCI (SCI format 2-A or SCI format 2-B), wherein SCI format 2-B means multicast.
  • the second device instructs the CAPC by sending a signaling, for example, carrying the CAPC through the 1st stage SCI or the 2nd stage SCI.
  • the first device receives the COT indication sent by the second device (device 1, device 2, and device 3) in time slot n1 , thereby obtaining COT#1, COT#2, and COT#3; in addition, the first device may have COT obtained before slot n 1 .
  • These COTs are all referred to as first COTs.
  • the first COT it is assumed that only COT#1 and COT#2 satisfy at least one first condition. "The COT satisfies at least one first condition” is equivalent to "the first device and the second device indicating the COT satisfy at least one first condition”. Therefore, the first device determines COT#1 and COT#2 as the second COT. Taking the condition "the RSRP between the first device and the second device indicating the second COT is greater than the threshold" as an example, in the first COT, only the RSRPs of COT#1 and COT#2 are greater than the RSRP threshold.
  • the RSRP threshold is configured or pre-configured.
  • the RSRP threshold is determined based on the receiving priority and the sending priority. For example, the RSRP threshold is equal to the threshold Th(prioRX ,prioTX).
  • the first device shares the second COT through resource selection.
  • the first device determines a resource selection window that is temporally located within the second COT.
  • the first device determines a candidate resource set within the resource selection window, and selects candidate resources from the candidate resource set. In case the LBT is successful, the first device sends side link information on the selected candidate resource. If there is no COT satisfying the condition, the first device does not share the COT.
  • the first device selects a third channel occupancy time (COT) for obtaining the candidate resource set from more than one second channel occupancy time (COT).
  • COT channel occupancy time
  • the first device may further select one of the COTs as the shared COT.
  • the third channel occupancy time (COT) is indicated by the COT indication sent by the third device, and the first device and the third device meet at least one of the following conditions (second condition):
  • the RSRP between the first device and the third device is the highest;
  • the distance between the first device and the third device is the smallest
  • the COT end time indicated by the COT indication sent by the third device is the latest
  • the COT end time indicated by the COT indication sent by the third device is the earliest.
  • the first device may select according to at least one of RSRP, distance, and end time of COT.
  • both COT#1 and COT#2 are COTs that can be shared.
  • the first device further selects COT#1 with the latest end time as the shared COT.
  • the resource selection window determined by the first device is located within COT#1 in time.
  • the device can only share the COT that meets certain conditions, instead of sharing any COT that can be received. In this way, excessive occupation of unlicensed frequency bands by devices can be further prevented, thereby avoiding interference to other coexisting devices.
  • the set of candidate resources does not include at least part of the candidate resources overlapping with the first resource, and the first resource is a resource reserved by the fourth device sent the COT indication.
  • the device that sends the COT indication may also use some resources (the first resource) in the COT, so the device should try to avoid this part of resources when sharing the COT.
  • the device may exclude candidate resources overlapping with this part of resources when determining the set of candidate resources.
  • the first device and the fourth device meet at least one of the following conditions (first condition):
  • the RSRP between the first device and the fourth device is greater than the first threshold
  • the distance between the first device and the fourth device is smaller than a second threshold
  • the first device is a sender of the side link information of the fourth device
  • the first device is a recipient of the side link information of the fourth device
  • the first device and the fourth device have the same broadcast type (cast type);
  • the channel access priority level (CAPC) value of the first device is smaller than the channel access priority level (CAPC) value of the fourth device.
  • COT#1 and COT#2 satisfy at least one first condition. Therefore, the resource reserved by device 1 and device 2 in COT#1 and COT#2 is the first resource.
  • the set of candidate resources determined by the device does not include candidate resources overlapping with the first resource.
  • the resources reserved by the fourth device include all resources within the reserved time slots.
  • the first resource may also include one or more time slots, that is, include all resources in the one or more time slots.
  • the candidate resource set determined by the first device is described by taking FIG. 6 as an example.
  • COT#1 and COT#2 satisfy at least one first condition.
  • the first resource includes the time slot where the resource reserved by device 1 in COT#1 is located, that is, the sending time slot of device 1 . Due to the half-duplex limitation, device 1 cannot receive in the time slot when device 1 is sending, therefore, the first device should avoid sending side link information to device 1 in the time slot when device 1 is sending. Therefore, the set of candidate resources determined by the first device does not include candidate resources overlapping with the sending time slot of device 1, that is, avoids the entire time slot.
  • the first resource also includes resources reserved by device 2 in COT#2.
  • the first device transmits to the device 1, it needs to avoid interference with the device 2. Therefore, the first device needs to avoid sending on the resource reserved by the device 2. Therefore, the set of candidate resources determined by the first device does not include candidate resources overlapping with the resources reserved by the device 2, that is, time-frequency resources are avoided.
  • the set of candidate resources does not include at least some candidate resources overlapping with a second resource, which is a reserved resource and whose corresponding RSRP is greater than a fourth threshold (RSRP Threshold).
  • the set of candidate resources does not include candidate resources overlapping with the reserved resource.
  • the first device when the number of resources in the candidate resource set is less than a third threshold (number threshold), the first device adds candidate resources that meet the following conditions to the candidate resource set: the candidate resource does not overlap with the first resource; The candidate resource overlaps with the second resource, and the RSRP of the second resource is smaller than a raised fourth threshold (RSRP threshold).
  • RSRP threshold a raised fourth threshold
  • the device may increase the RSRP threshold.
  • Fig. 7 is a schematic diagram of resource selection according to an embodiment of the present application, schematically showing some situations in which a physical layer of a device performs resource selection.
  • the resource selection includes:
  • the device may determine the candidate resource set SA according to FIG. 7 .
  • FIG. 7 is only an example of the present application, and this embodiment of the present application does not limit the device to perform other steps.
  • the order of 702 and 703 in FIG. 7 can be interchanged.
  • the set of candidate resources does not include candidate resources overlapping with the first resource and the second resource.
  • the device increases the RSRP threshold, for example, increases the RSRP threshold by 3dB, and then restarts the execution from step 701 .
  • the third threshold is, for example, 20% of the total number of candidate resources
  • the fourth threshold is, for example, equal to the threshold Th( prioRX, prioTX).
  • the first device when the number of resources in the candidate resource set is less than the third threshold, the first device adds candidate resources meeting the following condition to the candidate resource set: the candidate resource overlaps with the first resource.
  • the device preferentially selects candidate resource sets that meet the following conditions:
  • the set of candidate resources does not include candidate resources overlapping with the first resource and the second resource;
  • the number of resources in the candidate resource set is not less than the third threshold (number threshold).
  • the device If the device cannot select a candidate resource set that meets the above conditions, as described above, the device increases the RSRP threshold, and adds candidate resources that overlap with the second resource into the candidate resource set. If still no candidate resource set meeting the resource number requirement can be selected, the device adds candidate resources overlapping with the first resource into the candidate resource set. Taking FIG. 7 as an example, when the number of resources in the candidate resource set cannot be satisfied by increasing the RSRP threshold, the device adds candidate resources overlapping with the first resource into the candidate resource set.
  • Fig. 8 is another schematic diagram of resource selection according to the embodiment of the present application, schematically showing other situations in which a physical layer of a device performs resource selection.
  • the resource selection includes:
  • the device may determine the candidate resource set SA according to FIG. 8 . After performing 802, the device judges whether the number of resources in the candidate resource set is less than a third threshold. If the number of resources is less than the third threshold, the device reinitializes SA as a set including all candidate resources, and then performs subsequent 804 . This is equivalent to falling back to the situation where the first resource and the second resource are not treated differently, and all reserved resources are processed based on the RSRP size.
  • the device preferentially protects the device that initiates the COT from being interfered, which is in line with the original intention of COT sharing.
  • these embodiments of the present application are also beneficial to improve the reliability of COT indication transmission, and help the COT to be correctly received by more devices, so that the COT can be fully shared.
  • traditional mode 2 resource selection does not discriminate against devices that initiate COTs, and cannot guarantee ideal COT sharing.
  • the first device monitors (monitors) the Physical Sidelink Control Channel (PSCCH) outside the Channel Occupancy Time (COT) more often than during the Channel Occupancy Time (COT) The frequency of the channel control channel (PSCCH).
  • PSCCH Physical Sidelink Control Channel
  • a device needs to listen to the PSCCH to receive data.
  • the device can determine whether a certain listening moment is within the COT. Devices can use this information to determine the behavior of listening to the PSCCH. Affected by the LBT, the transmission outside the COT has higher uncertainty, so the device can monitor the PSCCH more frequently outside the COT.
  • the device monitors the PSCCH periodically, and the period for the device to monitor the PSCCH outside the COT is shorter than the period for the device to monitor the PSCCH inside the COT. For example, within a unit time (one or more time slots), the number of times the device monitors the PSCCH outside the COT is H1, and the number of times the device monitors the PSCCH inside the COT is H2, where H1>H2.
  • the frequency (or frequency) of the device monitoring the PSCCH outside the COT is greater than the frequency (or frequency) of monitoring the PSCCH inside the COT.
  • the “frequency” here refers to, for example, the number of times per unit time, which is different from the "frequency" in the "time-frequency resource”.
  • the second device performs listen-before-talk (LBT) on an unlicensed frequency band; obtains channel occupancy time (COT) according to the first-listen-before-transmit (LBT); and sends information including the channel occupancy time (COT) COT instructions.
  • LBT listen-before-talk
  • COT channel occupancy time
  • LBT first-listen-before-transmit
  • the device receiving the COT indication is the first device
  • the device sending the COT indication includes the second device to the fourth device
  • the second device to the fourth device in the embodiment of the present application may be the same device
  • the candidate resource set is determined according to the channel occupancy time (COT) on the unlicensed frequency band, and the transmission resource is selected in the candidate resource set; Send sidelink information.
  • COT channel occupancy time
  • An embodiment of the present application provides a side link transmission device.
  • the apparatus may be, for example, a terminal device (such as the aforementioned first device), or may be one or some components or components configured on the terminal device, and details that are the same as those in the embodiment of the first aspect will not be repeated here.
  • FIG. 9 is a schematic diagram of a side link transmission device according to an embodiment of the present application. As shown in FIG. 9, the side link transmission device 900 includes:
  • a determining unit 901 which determines the candidate resource set according to the channel occupancy time on the unlicensed frequency band
  • a selection unit 902 which selects a transmission resource from the set of candidate resources.
  • the sending unit 903 is configured to send the side link information on the sending resource when the listen-before-send for the side link sending is successful.
  • the channel occupancy time is obtained through a COT indication received by the first device.
  • the channel occupancy time is obtained by the first device listening before sending.
  • the sending unit 903 is further configured to send a COT indication including channel occupation time information.
  • the resource selection window used to determine the set of candidate resources is determined according to channel occupancy time.
  • the resource selection process including determining the candidate resource set is triggered by the first device according to a high layer request, or is triggered by the first device according to the channel occupancy time.
  • the resources reserved by the first device and the resources used for sending the reservation indication are located within the same channel occupation time, or within the same resource selection window.
  • the determining unit 901 determines one or more second resource selection windows according to the channel occupancy time.
  • the side link transmission device 900 further includes:
  • a receiving unit 904 which receives one or more COT indications indicating the first channel occupancy time
  • the determining unit 901 is further configured to determine a second channel occupancy time for obtaining a candidate resource set according to one or more first channel occupancy times and/or the channel occupancy time obtained through the first device performing listen-before-send.
  • the second channel occupancy time is indicated by a COT indication sent by the second device, and the first device and the second device meet at least one of the following conditions:
  • RSRP between the first device and the second device is greater than a first threshold
  • the distance between the first device and the second device is less than a second threshold
  • the first device is a sender of side link information of the second device
  • the first device is a recipient of the side link information of the second device
  • the first device has the same propagation type as the second device
  • the channel access priority value of the first device is smaller than the channel access priority value of the second device.
  • the selecting unit 902 is further configured to select a third channel occupation time for obtaining a candidate resource set from more than one second channel occupation time.
  • the third channel occupancy time is indicated by a COT indication sent by the third device, and the first device and the third device meet at least one of the following conditions:
  • the RSRP between the first device and the third device is the highest;
  • the distance between the first device and the third device is minimal
  • the COT end time indicated by the COT indication sent by the third device is the latest
  • the COT end time indicated by the COT indication sent by the third device is the earliest.
  • the set of candidate resources does not include at least part of the candidate resources overlapping with the first resource, and the first resource is a resource reserved by the fourth device sent the COT indication.
  • the resources reserved by the fourth device include all resources within the reserved time slots.
  • the first device and the fourth device meet at least one of the following conditions:
  • the RSRP between the first device and the fourth device is greater than a first threshold
  • a distance between the first device and the fourth device is less than a second threshold
  • the first device is a sender of side link information of the fourth device
  • the first device is a recipient of the side link information of the fourth device
  • the first device and the fourth device have the same propagation type
  • the channel access priority value of the first device is smaller than the channel access priority value of the fourth device.
  • the set of candidate resources does not include at least part of the candidate resources overlapping with the second resource, the second resource is a reserved resource and the corresponding RSRP is greater than the fourth threshold.
  • the determining unit 901 is further configured to: when the number of resources in the candidate resource set is less than a third threshold, add candidate resources that meet the following conditions into the candidate resource set: the candidate resources are not compatible with the The first resource overlaps; the candidate resource overlaps with the second resource, and the RSRP of the second resource is smaller than an increased fourth threshold.
  • the determining unit 901 is further configured to: when the number of resources in the candidate resource set is less than a third threshold, add candidate resources that meet the following conditions into the candidate resource set: the candidate resource and the The first resource overlaps.
  • the frequency of listening to the physical side-link control channel outside the channel occupation time is greater than the frequency of listening to the physical side-link control channel within the channel occupation time.
  • the side link transmission device 900 may also include other components or modules, and for specific content of these components or modules, reference may be made to related technologies.
  • FIG. 9 only exemplarily shows the connection relationship or signal direction between various components or modules, but it should be clear to those skilled in the art that various related technologies such as bus connection can be used.
  • the above-mentioned components or modules may be implemented by hardware facilities such as processors, memories, transmitters, receivers, etc.; the implementation of the present application is not limited thereto.
  • the candidate resource set is determined according to the channel occupancy time (COT) on the unlicensed frequency band, and the transmission resource is selected in the candidate resource set; Send sidelink information.
  • COT channel occupancy time
  • the embodiment of the present application also provides a communication system, which can be referred to FIG. 1 , and the same contents as those in the first and second embodiments are not repeated here.
  • the communication system 100 may at least include:
  • a terminal device which determines a candidate resource set according to channel occupancy time on an unlicensed frequency band; selects a transmission resource from the candidate resource set; Send side link information on the resource.
  • the embodiment of the present application also provides a network device, which may be, for example, a base station, but the present application is not limited thereto, and may be other network devices.
  • a network device which may be, for example, a base station, but the present application is not limited thereto, and may be other network devices.
  • FIG. 10 is a schematic diagram of a network device according to an embodiment of the present application.
  • the network device 1000 may include: a processor 1010 (such as a central processing unit CPU) and a memory 1020 ; the memory 1020 is coupled to the processor 1010 .
  • the memory 1020 can store various data; in addition, it also stores a program 1030 for information processing, and executes the program 1030 under the control of the processor 1010 .
  • the processor 1010 may be configured to execute a program and send at least one of the following or any combination of the following to the terminal device: message/configuration/information/signaling/indication, so that the terminal device implements the The side link transmission method.
  • the network device 1000 may further include: a transceiver 1040 and an antenna 1050 ; wherein, the functions of the above components are similar to those of the prior art, and will not be repeated here. It should be noted that the network device 1000 does not necessarily include all the components shown in FIG. 10 ; in addition, the network device 1000 may also include components not shown in FIG. 10 , and reference may be made to the prior art.
  • the embodiment of the present application also provides a terminal device, but the present application is not limited thereto, and may be other devices.
  • FIG. 11 is a schematic diagram of a terminal device according to an embodiment of the present application.
  • the terminal device 1100 may include a processor 1110 and a memory 1120 ; the memory 1120 stores data and programs, and is coupled to the processor 1110 . It is worth noting that this figure is exemplary; other types of structures may also be used in addition to or instead of this structure to implement telecommunications functions or other functions.
  • the processor 1110 may be configured to execute a program to implement the side link transmission method described in the embodiment of the first aspect.
  • the processor 1110 may be configured to perform the following control: determine a candidate resource set according to the channel occupancy time (COT) on the unlicensed frequency band; select a transmission resource from the candidate resource set; When the listen-behind-behind (LBT) succeeds, send side link information on the sending resource.
  • COT channel occupancy time
  • LBT listen-behind-behind
  • the terminal device 1100 may further include: a communication module 1130 , an input unit 1140 , a display 1150 , and a power supply 1160 .
  • a communication module 1130 the terminal device 1100 may further include: a communication module 1130 , an input unit 1140 , a display 1150 , and a power supply 1160 .
  • the functions of the above components are similar to those of the prior art, and will not be repeated here. It should be noted that the terminal device 1100 does not necessarily include all the components shown in FIG. have technology.
  • An embodiment of the present application further provides a computer program, wherein when the program is executed in a terminal device, the program causes the terminal device to execute the side link transmission method described in the embodiment of the first aspect.
  • An embodiment of the present application further provides a storage medium storing a computer program, wherein the computer program causes a terminal device to execute the side link transmission method described in the embodiment of the first aspect.
  • the above devices and methods in this application can be implemented by hardware, or by combining hardware and software.
  • the present application relates to a computer-readable program that, when executed by a logic component, enables the logic component to realize the above-mentioned device or constituent component, or enables the logic component to realize the above-mentioned various methods or steps.
  • the present application also relates to storage media for storing the above programs, such as hard disks, magnetic disks, optical disks, DVDs, flash memories, and the like.
  • the method/device described in conjunction with the embodiments of the present application may be directly embodied as hardware, a software module executed by a processor, or a combination of both.
  • one or more of the functional block diagrams shown in the figure and/or one or more combinations of the functional block diagrams may correspond to each software module or each hardware module of the computer program flow.
  • These software modules may respectively correspond to the steps shown in the figure.
  • These hardware modules for example, can be realized by solidifying these software modules by using a Field Programmable Gate Array (FPGA).
  • FPGA Field Programmable Gate Array
  • a software module may reside in RAM memory, flash memory, ROM memory, EPROM memory, EEPROM memory, registers, hard disk, removable disk, CD-ROM or any other form of storage medium known in the art.
  • a storage medium can be coupled to the processor such that the processor can read information from, and write information to, the storage medium, or it can be an integral part of the processor.
  • the processor and storage medium can be located in the ASIC.
  • the software module can be stored in the memory of the mobile terminal, or can be stored in a memory card that can be inserted into the mobile terminal.
  • the software module can be stored in the MEGA-SIM card or large-capacity flash memory device.
  • One or more of the functional blocks described in the accompanying drawings and/or one or more combinations of the functional blocks can be implemented as a general-purpose processor, a digital signal processor (DSP) for performing the functions described in this application ), application specific integrated circuits (ASICs), field programmable gate arrays (FPGAs) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, or any suitable combination thereof.
  • DSP digital signal processor
  • ASICs application specific integrated circuits
  • FPGAs field programmable gate arrays
  • One or more of the functional blocks described in the drawings and/or one or more combinations of the functional blocks can also be implemented as a combination of computing devices, for example, a combination of a DSP and a microprocessor, a plurality of microprocessors processor, one or more microprocessors in communication with a DSP, or any other such configuration.
  • a side link transmission method comprising:
  • the first device determines the candidate resource set according to the channel occupancy time (COT) on the unlicensed frequency band;
  • LBT listen-before-talk
  • the first device sends a COT indication including information of the channel occupancy time (COT).
  • COT channel occupancy time
  • the first device receives one or more COT indications indicating a first channel occupancy time (COT);
  • COT channel occupancy times
  • LBT listen-before-talk
  • RSRP between the first device and the second device is greater than a first threshold
  • the distance between the first device and the second device is less than a second threshold
  • the first device is a sender of side link information of the second device
  • the first device is a recipient of the side link information of the second device
  • the first device has the same cast type as the second device
  • the channel access priority level (CAPC) value of the first device is smaller than the channel access priority level (CAPC) value of the second device.
  • the first device selects a third channel occupancy time (COT) for obtaining the candidate resource set from more than one second channel occupancy time (COT).
  • COT channel occupancy time
  • the RSRP between the first device and the third device is the highest;
  • the distance between the first device and the third device is minimal
  • the COT end time indicated by the COT indication sent by the third device is the latest
  • the COT end time indicated by the COT indication sent by the third device is the earliest.
  • the RSRP between the first device and the fourth device is greater than a first threshold
  • a distance between the first device and the fourth device is less than a second threshold
  • the first device is a sender of side link information of the fourth device
  • the first device is a recipient of the side link information of the fourth device
  • the first device has the same cast type as the fourth device;
  • the channel access priority level (CAPC) value of the first device is smaller than the channel access priority level (CAPC) value of the fourth device.
  • the first device When the number of resources in the candidate resource set is less than a third threshold, the first device adds candidate resources meeting the following conditions to the candidate resource set: the candidate resource does not overlap with the first resource; the The candidate resource overlaps with the second resource, and the RSRP of the second resource is smaller than the raised fourth threshold.
  • the first device When the number of resources in the candidate resource set is less than a third threshold, the first device adds candidate resources meeting the following condition to the candidate resource set: the candidate resource overlaps with the first resource.
  • a sidelink transmission method comprising:
  • the second device performs listen-before-transmit (LBT) on the unlicensed frequency band
  • COT channel occupancy time
  • LBT listen-before-talk
  • COT indication including information about the channel occupancy time (COT).
  • a sidelink transmission method comprising:
  • the first device obtains a channel occupancy time (COT) on the unlicensed frequency band
  • the first device monitors a Physical Sidelink Control Channel (PSCCH);
  • PSCCH Physical Sidelink Control Channel
  • the frequency of monitoring (monitoring) the physical side link control channel (PSCCH) outside the channel occupation time (COT) is greater than the frequency of monitoring (monitoring) the physical side link control channel within the channel occupation time (COT) (PSCCH) frequency.
  • COT channel occupancy time
  • a terminal device comprising a memory and a processor, the memory stores a computer program, and the processor is configured to execute the computer program to implement the side link as described in any one of Supplements 1 to 23 transfer method.

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Abstract

本申请实施例提供一种边链路传输方法以及装置。该方法包括：第一设备在非授权频段上根据信道占用时间确定候选资源集合（401）；在候选资源集合中选择发送资源（402）；以及在针对边链路发送的先听后发成功的情况下，在发送资源上发送边链路信息（403）。

Description

边链路传输方法以及装置 技术领域
本申请实施例涉及通信技术领域。
背景技术
3GPP在Rel-16完成了对新无线(NR)边链路(sidelink)的标准化，其主要应用场景是针对V2X(Vehicle to Everything)，也称为NR V2X。相比于使用Uu链路的蜂窝通信，发送设备通过边链路(sidelink)与接收设备直接进行通信。
NR sidelink在资源池内进行边链路通信，定义的物理信道包括物理边链路控制信道(PSCCH，Physical Sidelink Control Channel)、物理边链路共享信道(PSSCH，Physical Sidelink Shared Channel)和物理边链路反馈信道(PSFCH，Physical Sidelink Feedback Channel)。PSCCH承载1st stage边链路控制信息(SCI，Sidelink Control Information)，1st stage SCI主要用于预留资源。PSSCH承载2nd stage SCI以及数据，其中2nd stage SCI主要用于数据解调。PSFCH承载边链路反馈信息(HARQ-ACK)。
NR sidelink定义了两种资源分配模式。对于模式1(mode 1)，终端设备用于边链路通信的资源由网络设备(基站)通过NR Uu链路进行调度或配置。对于模式2(mode 2)，终端设备可以基于自身感知结果，自主地对用于边链路通信的时频资源进行选择。
为满足日益增长的对sidelink边链路通信的需求，特别是来自商业场景的需求，sidelink演进成为了3GPP在Rel-18(也称为5G-Advanced)的立项之一。Rel-18 sidelink立项的研究内容之一是基于sidelink的免许可接入(SL-U，Sidelink Unlicensed)，其主要驱动力是通过使用非授权频谱(或共享频谱)支持更高的数据速率。
应该注意，上面对技术背景的介绍只是为了方便对本申请的技术方案进行清楚、完整的说明，并方便本领域技术人员的理解而阐述的。不能仅仅因为这些方案在本申请的背景技术部分进行了阐述而认为上述技术方案为本领域技术人员所公知。
发明内容
发明人发现：SL-U主要应用于商业场景，但也不排除用于高自动化程度的V2X 等。以商业场景为例，高数据速率是虚拟现实VR(Virtual Reality)、增强现实AR(Augmented Reality)等XR技术不可缺少的重要指标，SL-U可以通过使用额外的频谱满足高速率要求。此外，工业物联网(industry IoT)、智能家庭(smart home)也是比较适合部署和使用SL-U的场景。
SL-U目前刚刚在Rel-18中得到立项，具体的标准化工作尚未在3GPP内启动。目前，如何在SL-U中基于资源分配mode 2(自主资源选择)进行边链路传输仍然是一个开放性的问题。
针对上述问题的至少之一，本申请实施例提供一种边链路传输方法和装置。
根据本申请实施例的一个方面，提供一种边链路传输方法，包括：
第一设备在非授权频段上根据信道占用时间确定候选资源集合；
在所述候选资源集合中选择发送资源；以及
在针对边链路发送的先听后发成功的情况下，在所述发送资源上发送边链路信息。
根据本申请实施例的另一个方面，提供一种边链路传输装置，包括：
确定单元，其在非授权频段上根据信道占用时间确定候选资源集合；
选择单元，其在所述候选资源集合中选择发送资源；以及
发送单元，其在针对边链路发送的先听后发成功的情况下，在所述发送资源上发送边链路信息。
根据本申请实施例的另一个方面，提供一种通信系统，包括：
终端设备，其在非授权频段上根据信道占用时间确定候选资源集合；在所述候选资源集合中选择发送资源；以及在针对边链路发送的先听后发成功的情况下，在所述发送资源上发送边链路信息。
本申请实施例的有益效果之一在于：在非授权频段上根据信道占用时间(COT)确定候选资源集合，在候选资源集合中选择发送资源；以及在针对边链路发送的LBT成功的情况下，在发送资源上发送边链路信息。由此，使用边链路通信的设备能够高效地竞争和使用非授权频段，并能够与其他使用非授权频段的设备公平地共存。
参照后文的说明和附图，详细公开了本申请的特定实施方式，指明了本申请的原理可以被采用的方式。应该理解，本申请的实施方式在范围上并不因而受到限制。在所附权利要求的精神和条款的范围内，本申请的实施方式包括许多改变、修改和等同。
针对一种实施方式描述和/或示出的特征可以以相同或类似的方式在一个或更多 个其它实施方式中使用，与其它实施方式中的特征相组合，或替代其它实施方式中的特征。
应该强调，术语“包括/包含”在本文使用时指特征、整件、步骤或组件的存在，但并不排除一个或更多个其它特征、整件、步骤或组件的存在或附加。
附图说明
在本申请实施例的一个附图或一种实施方式中描述的元素和特征可以与一个或更多个其它附图或实施方式中示出的元素和特征相结合。此外，在附图中，类似的标号表示几个附图中对应的部件，并可用于指示多于一种实施方式中使用的对应部件。
图1是本申请实施例的通信系统的示意图；
图2是COT共享的一示意图；
图3是基于交织(interlace)进行发送的一示意图；
图4是本申请实施例的边链路传输方法的一示意图；
图5是本申请实施例的资源选择的一示例图；
图6是本申请实施例的设备共享COT的一示意图；
图7是本申请实施例的资源选择的一示意图；
图8是本申请实施例的资源选择的另一示意图；
图9是本申请实施例的边链路传输装置的一示意图；
图10是本申请实施例的网络设备的一示意图；
图11是本申请实施例的终端设备的一示意图。
具体实施方式
参照附图，通过下面的说明书，本申请的前述以及其它特征将变得明显。在说明书和附图中，具体公开了本申请的特定实施方式，其表明了其中可以采用本申请的原则的部分实施方式，应了解的是，本申请不限于所描述的实施方式，相反，本申请包括落入所附权利要求的范围内的全部修改、变型以及等同物。
在本申请实施例中，术语“第一”、“第二”等用于对不同元素从称谓上进行区分，但并不表示这些元素的空间排列或时间顺序等，这些元素不应被这些术语所限制。术语“和/或”包括相关联列出的术语的一种或多个中的任何一个和所有组合。术语“包含”、 “包括”、“具有”等是指所陈述的特征、元素、元件或组件的存在，但并不排除存在或添加一个或多个其他特征、元素、元件或组件。
在本申请实施例中，单数形式“一”、“该”等包括复数形式，应广义地理解为“一种”或“一类”而并不是限定为“一个”的含义；此外术语“所述”应理解为既包括单数形式也包括复数形式，除非上下文另外明确指出。此外术语“根据”应理解为“至少部分根据……”，术语“基于”应理解为“至少部分基于……”，除非上下文另外明确指出。
在本申请实施例中，术语“通信网络”或“无线通信网络”可以指符合如下任意通信标准的网络，例如长期演进(LTE，Long Term Evolution)、增强的长期演进(LTE-A，LTE-Advanced)、宽带码分多址接入(WCDMA，Wideband Code Division Multiple Access)、高速报文接入(HSPA，High-Speed Packet Access)等等。
并且，通信系统中设备之间的通信可以根据任意阶段的通信协议进行，例如可以包括但不限于如下通信协议：1G(generation)、2G、2.5G、2.75G、3G、4G、4.5G以及5G、新无线(NR，New Radio)等等，和/或其他目前已知或未来将被开发的通信协议。
在本申请实施例中，术语“网络设备”例如是指通信系统中将终端设备接入通信网络并为该终端设备提供服务的设备。网络设备可以包括但不限于如下设备：基站(BS，Base Station)、接入点(AP、Access Point)、发送接收点(TRP，Transmission Reception Point)、广播发射机、移动管理实体(MME、Mobile Management Entity)、网关、服务器、无线网络控制器(RNC，Radio Network Controller)、基站控制器(BSC，Base Station Controller)等等。
其中，基站可以包括但不限于：节点B(NodeB或NB)、演进节点B(eNodeB或eNB)以及5G基站(gNB)，等等，此外还可包括远端无线头(RRH，Remote Radio Head)、远端无线单元(RRU，Remote Radio Unit)、中继(relay)或者低功率节点(例如femeto、pico等等)。并且术语“基站”可以包括它们的一些或所有功能，每个基站可以对特定的地理区域提供通信覆盖。术语“小区”可以指的是基站和/或其覆盖区域，这取决于使用该术语的上下文。
在本申请实施例中，术语“用户设备”(UE，User Equipment)或者“终端设备”(TE，Terminal Equipment或Terminal Device)例如是指通过网络设备接入通信网络并接收网络服务的设备。终端设备可以是固定的或移动的，并且也可以称为移动台 (MS，Mobile Station)、终端、用户台(SS，Subscriber Station)、接入终端(AT，Access Terminal)、站，等等。
其中，终端设备可以包括但不限于如下设备：蜂窝电话(Cellular Phone)、个人数字助理(PDA，Personal Digital Assistant)、无线调制解调器、无线通信设备、手持设备、机器型通信设备、膝上型计算机、无绳电话、智能手机、智能手表、数字相机，等等。
再例如，在物联网(IoT，Internet of Things)等场景下，终端设备还可以是进行监控或测量的机器或装置，例如可以包括但不限于：机器类通信(MTC，Machine Type Communication)终端、车载通信终端、设备到设备(D2D，Device to Device)终端、机器到机器(M2M，Machine to Machine)终端，等等。
此外，术语“网络侧”或“网络设备侧”是指网络的一侧，可以是某一基站，也可以包括如上的一个或多个网络设备。术语“用户侧”或“终端侧”或“终端设备侧”是指用户或终端的一侧，可以是某一UE，也可以包括如上的一个或多个终端设备。本文在没有特别指出的情况下，“设备”可以指网络设备，也可以指终端设备。
以下通过示例对本申请实施例的场景进行说明，但本申请不限于此。
图1是本申请实施例的通信系统的示意图，示意性说明了以终端设备和网络设备为例的情况，如图1所示，通信系统100可以包括网络设备101和终端设备102、103。为简单起见，图1仅以两个终端设备和一个网络设备为例进行说明，但本申请实施例不限于此。
在本申请实施例中，网络设备101和终端设备102、103之间可以进行现有的业务或者未来可实施的业务发送。例如，这些业务可以包括但不限于：增强的移动宽带(eMBB，enhanced Mobile Broadband)、大规模机器类型通信(mMTC，massive Machine Type Communication)和高可靠低时延通信(URLLC，Ultra-Reliable and Low-Latency Communication)，等等。
值得注意的是，图1示出了两个终端设备102、103均处于网络设备101的覆盖范围内，但本申请不限于此。两个终端设备102、103可以均不在网络设备101的覆盖范围内，或者一个终端设备102在网络设备101的覆盖范围之内而另一个终端设备103在网络设备101的覆盖范围之外。
在本申请实施例中，两个终端设备102、103之间可以进行边链路发送。例如， 两个终端设备102、103可以都在网络设备101的覆盖范围之内进行边链路发送以实现边链路通信，也可以都在网络设备101的覆盖范围之外进行边链路发送以实现边链路通信，还可以一个终端设备102在网络设备101的覆盖范围之内而另一个终端设备103在网络设备101的覆盖范围之外进行边链路发送以实现边链路通信。
在5G阶段，3GPP对sidelink和非授权频段都进行过标准化研究和立项，例如Rel-16的NR V2X、Rel-17的sidelink增强(enhancement)、Rel-16的NR-U(NR-Unlicensed)。
NR sidelink定义了两种资源分配模式：模式1(mode 1)和模式2(mode 2)。mode 2资源选择的主要步骤如表1所示。完整的资源选择过程可以参见标准TS 38.214的8.1.4小节。
表1
Figure PCTCN2022074648-appb-000001
Figure PCTCN2022074648-appb-000002
3GPP在Rel-17对NR sidelink的资源分配进行了进一步增强，包括节省功率(power saving)和设备间协作(inter-UE coordination)，应用场景也扩展到公共安全(public safety)和商业相关的服务。
另一方面，为了使5G技术能够使用非授权频谱(频段)，3GPP在Rel-16完成了对基于NR的免许可接入(NR-U，New Radio-Unlicensed)的标准化。对非授权频段的使用需要遵守不同国家和地区的监管规则，为此，NR-U在NR基础上支持了一些新的特性，包括先听后发(LBT，Listen Before Talk)、信道占用时间(COT，Channel Occupancy Time)、COT共享(COT sharing)、基于交织(interlace)的发送等等。
为保证与WIFI等系统公平共存，对非授权频段的接入需要使用LBT对信道进行检测和评估，只有在信道空闲(LBT成功)时才能够获得信道接入机会进行发送。NR-U定义了三种LBT过程，包括Cat1 LBT(LBT等级1)、Cat2 LBT(LBT等级2)和Cat4 LBT(LBT等级4)。Cat1 LBT可以不进行信道检测。Cat2 LBT包括Cat2 16μs LBT和Cat2 25μs LBT，在发送数据前要经过一个16μs和25μs的信道检测。Cat4 LBT包含次数可变的多个信道检测。LBT的等级越高，LBT成功的条件越严格。
为了更加有效地占用信道，设备(基站)可以共享基站(设备)获得的COT，称为COT共享。设备或基站在共享COT时可以使用低等级的LBT，从而避免每次发送都使用最高等级的LBT，获得降低传输时延的效果。
图2是COT共享的一示意图，对COT共享进行了示意性说明。例如，基站通过Cat4 LBT占用信道，进行下行数据发送，并发送COT指示，即发起COT。COT指示可以指示COT持续时间、COT内支持的LBT带宽、COT内的上下行数据结构等。
如果设备的上行发送与基站的前次下行发送的时间间隔小于16μs，则基站可以指示设备通过Cat1 LBT进行数据发送。如果设备的上行发送与基站的前次下行发送的时间间隔等于16μs或25μs，则基站可以指示设备通过Cat2 16μs LBT或Cat2 25μs LBT进行数据发送。如果设备基于COT指示得知在基站发起的COT内，则设备也可以根据上下行数据的时间间隔调整上行发送的LBT等级，例如从Cat4 LBT变为Cat2 LBT。
LBT等级例如可以包括Cat1 LBT(LBT等级1)、Cat2 LBT(LBT等级2)和Cat4 LBT(LBT等级4)，或者例如可以包括class 1和class 2等，或者例如可以包括type A、type B、type C、type D等，本申请实施例不限制具体的表现形式。
为满足监管规则对信道占用带宽的要求，NR-U的PUSCH和PUCCH基于频域交织的方式进行发送。图3是基于交织(interlace)进行发送的一示意图，对交织进行了示意性说明。如图3所示，一个交织包括频域上离散的若干资源块(RB，Resource Block)，离散的RB在频域上等间隔分布。一次发送可以使用一个或多个交织。
对于Cat4 LBT，信道接入优先等级(CAPC，Channel Access Priority Class)用于确定LBT过程所需的相关参数，例如最大信道占用时间、竞争窗长度等。表2对上行的信道接入优先等级进行了示意性说明。CAPC数值p越小，表示信道接入优先等级越高。设备在进行Cat4 LBT时需要知道使用哪一个CAPC数值。
表2
CAPC(p) m p CW min p CW max p T ulmcot，p allowed CW psizes
1 2 3 7 2ms {3,7}
2 2 7 15 4ms {7,15}
3 3 15 1023 6ms or 10ms {15,31,63,127,255,511,1023}
4 7 15 1023 6ms or 10ms {15,31,63,127,255,511,1023}
在以下的说明中，在不引起混淆的情况下，术语“边链路”和“V2X”可以互换，术语“PSFCH”和“边链路反馈信道”可以互换，术语“PSCCH”和“边链路控制信道”或“边链路控制信息”可以互换，术语“PSSCH”和“边链路数据信道”或“边链路数据”也可以互换。
另外，发送(transmitting)或接收(receiving)PSCCH可以理解为发送或接收由PSCCH承载的边链路控制信息；发送或接收PSSCH可以理解为发送或接收由PSSCH承载的边链路数据；发送或接收PSFCH可以理解为发送或接收由PSFCH承载的边链路反馈信息。边链路发送(Sidelink transmission，也可称为边链路传输)可以理解为PSCCH/PSSCH发送或者边链路数据/信息发送。
在本申请实施例中，时间单位可以具有任何时间长度，例如可以是帧(frame)、子帧(sub-frame)、时隙(slot)、小时隙(mini-slot)等，以下仅以时隙为例进行说明；PSCCH/PSSCH也可简称为PSSCH，SCI可以指1st stage SCI和/或2nd stage SCI；边 链路信息包括边链路控制信息和/或数据信息和/或反馈信息。
第一方面的实施例
本申请实施例提供一种边链路传输方法，先从第一设备侧进行说明。
图4是本申请实施例的边链路传输方法的一示意图，如图4所示，该方法包括：
401，第一设备在非授权频段上根据信道占用时间(COT)确定候选资源集合；
402，第一设备在所述候选资源集合中选择发送资源；以及
403，第一设备在针对边链路发送的先听后发(LBT)成功的情况下，在所述发送资源上发送边链路信息。
值得注意的是，以上附图4仅对本申请实施例进行了示意性说明，但本申请不限于此。例如可以适当地调整各个操作之间的执行顺序，此外还可以增加其他的一些操作或者减少其中的某些操作。本领域的技术人员可以根据上述内容进行适当地变型，而不仅限于上述附图4的记载。
在一些实施例中，信道占用时间(COT)通过第一设备接收到的COT指示而获得。例如，第二设备(或者后述的第三设备或第四设备)向第一设备发送COT指示，第一设备根据该COT指示获得该COT。
在一些实施例中，信道占用时间(COT)通过第一设备进行先听后发(LBT)而获得。例如，第一设备可以通过自身成功进行Cat4 LBT获得COT，关于LBT和COT的具体内容，可以参考NR-U中的相关技术。
在一些实施例中，第一设备发送包括信道占用时间(COT)的信息的COT指示。例如，第一设备通过自身成功进行Cat4 LBT获得COT后，可以通过资源选择过程在该COT内发送边链路信息，并且第一设备还可以向其他设备发送包括该COT信息的COT指示。
在一些实施例中，用于确定候选资源集合的资源选择窗根据信道占用时间(COT)确定。例如，在根据包括包延迟预算(PDB，Packet Delay Budget)的信息确定的第一资源选择窗内，第一设备根据信道占用时间(COT)确定一个或多个第二资源选择窗。
图5是本申请实施例的资源选择的一示例图。如图5所示，例如，设备的高层(例如MAC层)在时隙n请求物理层上报候选资源集合。如果根据NR sidelink的资源选 择方案，资源选择窗根据包括PDB的信息而确定，例如，如图5中第一资源选择窗的n+T1和n+T2所示。
在本申请的一些实施例中，资源选择窗根据COT而确定，例如图5中所示的资源选择窗1、资源选择窗2、资源选择窗3。如图5所示，第一资源选择窗内可以包括多个第二资源选择窗(即资源选择窗1、资源选择窗2、资源选择窗3)。
在本申请实施例中，在非授权频段上根据信道占用时间(COT)确定候选资源集合，在候选资源集合中选择发送资源；以及在针对边链路发送的LBT成功的情况下，在发送资源上发送边链路信息。由此，使用边链路通信的设备能够高效地竞争和使用非授权频段，并能够与其他使用非授权频段的设备公平地共存。
在一些实施例中，包括确定候选资源集合的资源选择过程由第一设备根据高层请求触发。边链路资源选择过程的具体内容还可以参考相关技术，例如前面表1所述的内容，本申请实施例不再赘述。
例如，如图5中的资源选择窗1所示，第一设备在时隙n之前的时隙n-t 1接收到发起COT的第二设备发送的COT指示，从而获得COT。第一设备通过资源选择过程共享COT。第一设备在COT内确定资源选择窗1，确定候选资源集合，并将其上报给高层。高层在候选资源集合中选择候选资源。在LBT成功的情况下，第一设备在选择的候选资源上发送边链路信息(PSCCH/PSSCH)。
第一设备在共享的COT内进行LBT时，可以使用相对简单的LBT(Cat1 LBT,Cat2 LBT)。例如，第一设备通过接收SCI(1st stage SCI和/或2nd stage SCI)可以获得发起COT的第二设备的发送资源，在与自己选择的发送资源之间的时间间隔足够小的情况下，可以使用Cat1 LBT或Cat2 LBT。
在一些实施例中，包括确定候选资源集合的资源选择过程由第一设备根据信道占用时间(COT)触发。
例如，如图5中的资源选择窗3所示，第一设备在时隙n+t 3接收到COT指示，从而共享COT。这里与资源选择窗1对应的共享COT不同之处在于：时隙n+t 3位于时隙n之后。
即，在时隙n+t 3位于时隙n之后的情况下，资源选择是由在时隙n+t 3接收到的COT指示触发的，或者说是由已经获得的COT触发的。在时隙n-t 1位于时隙n之前的情况下，资源选择是由时隙n的高层请求触发的，在资源选择过程中使用了已 经获得的COT。
在一些实施例中，第一设备在LBT成功的情况下发起信道占用时间(COT)。
例如，如图5中的资源选择窗2所示，第一设备在时隙n+t 2获得COT。该COT不是通过共享其他设备的COT获得，而是通过自身成功进行Cat4 LBT获得。此时第一设备成为发起COT的设备。第一设备可以通过资源选择过程在COT内发送边链路信息，并且第一设备可以发送COT指示。
在一些实施例中，设备可以预留未来用于发送的资源，通过1st stage SCI和/或2nd stage SCI指示预留的资源。
在一些实施例中，第一设备预留的资源与用于发送预留指示的资源位于相同的信道占用时间(COT)内，或者，第一设备预留的资源与用于发送预留指示的资源位于相同的资源选择窗内。
例如，设备预留的资源位于当前COT内。换句话说，设备仅预留位于当前COT内的资源，而不预留在当前COT之后的资源。例如，如图5所示，以资源选择窗1为例，设备在共享的COT(资源选择窗1)内进行资源选择，预留的资源也位于共享的COT(资源选择窗1)内。这对于资源选择窗2和资源选择窗3也同样适用。又例如，对于周期业务发送，设备不为当前COT以外的下一个周期的发送预留资源。
图5示出了本申请实施例与传统资源选择过程对比的情况。对于传统资源选择，设备的高层在时隙n请求物理层上报候选资源集合，设备在剩余PDB内确定起止时隙分别为n+T 1和n+T 2的资源选择窗，在资源选择窗内一次性选择出资源进行发送。相比于传统方法，本申请实施例基于获得的COT动态地确定资源选择窗(第二资源选择窗，例如资源选择窗1、资源选择窗2、资源选择窗3)，在每个资源选择窗内选择资源进行发送。
由此，本申请实施例中，设备以一种动态的方式进行资源选择。设备一旦获得COT，就在COT内通过资源选择进行数据发送。这种动态的资源选择过程使设备能够更加积极、高效地竞争非授权频段的使用权，增强了设备对于非授权频段的竞争力。由于COT内的LBT可以使用更低的LBT等级，从而更容易接入信道，这也有利于设备更加高效地接入信道。此外，在一段时间范围(资源选择窗)内选择资源也增加了随机性，可以避免多个设备由于竞争同一个资源而发生资源碰撞。
以上示意性说明了根据COT确定候选资源，以下再对共享COT进行说明。
为满足非授权频段的法律法规要求，PSCCH/PSSCH以交织(interlace)的形式进行发送。一个交织包括频域上等间隔分布的若干资源块(RB)，可以看作一个簇(cluster)内的若干连续的RB以簇为间隔进行重复。发明对于设备在哪些时隙使用哪些交织不做限制。
图6是本申请实施例的设备共享COT的一示意图。为简单起见，图6假设设备在不同时隙使用相同的交织。对于使用非授权频段进行发送的设备，有的设备发送COT指示(设备1、设备2和设备3)，有的设备不发送COT指示(设备4)。
例如，发起COT的设备发送COT指示，共享COT的设备不发送COT指示。COT指示由PSCCH/PSSCH承载。例如，COT指示由1st stage SCI承载。又例如，COT指示由2nd stage SCI承载，1st stage SCI指示2nd stage SCI中是否承载COT指示。
图6示出了用于发送COT指示的资源，没有分别单独示出PSCCH资源和PSSCH资源。COT指示不一定在所有簇中发送，本申请实施例对COT指示在哪些簇中发送不做限制。COT指示至少指示COT的结束时间，例如指示从COT指示的所在时隙到COT结束时隙的时间间隔。
在时隙n接收到的1st stage SCI和/或2nd stage SCI至少指示设备在未来一段时间内(包括时隙n)实际用于发送的时频资源(使用的交织)。这些资源称为被预留的资源。例如，发送COT指示的设备指示在COT内预留的资源。本申请实施例对于设备如何指示预留资源以及预留资源所在的时频位置不做限制。图6所示的预留资源的时频位置仅作为一种示意，本申请实施例不限于此。
在一些实施例中，第一设备接收一个或多个指示第一信道占用时间(COT)的COT指示；根据一个或多个第一信道占用时间(COT)和/或通过进行先听后发(LBT)获得的信道占用时间(COT)确定用于获得候选资源集合的第二信道占用时间(COT)。
例如，设备可能接收到多个COT，然而并非所有COT都适合被用于COT共享。第一设备可以对多个COT进行筛选/过滤等。
在一些实施例中，第二信道占用时间(COT)由第二设备发送的COT指示所指示，第一设备与第二设备满足以下至少一个条件(第一条件)：
第一设备与第二设备之间的参考信号接收功率(RSRP，Reference Signal Receiving Power)大于第一门限(RSRP门限)；
第一设备与第二设备之间的距离小于第二门限(距离门限)；
第一设备是第二设备的边链路信息的发送方；
第一设备是第二设备的边链路信息的接收方；
第一设备与第二设备具有相同的传播类型(cast type)；
第一设备的信道接入优先等级(CAPC)值小于第二设备的信道接入优先等级(CAPC)值。
例如，如果两个设备的LBT结果不同，则这两个设备之间不适合共享COT，因此可以根据两个设备间的RSRP和/或距离来判断是否共享COT。
又例如，一个单播对(pair)中的设备可能不适合共享另外一个单播对中的设备发起的COT，因此可以根据两个设备是否属于一对收发设备来判断是否共享COT。
又例如，单播设备可能不适合共享广播设备发起的COT，因此可以根据两个设备是否具有相同的cast type来判断是否共享COT。
又例如，信道接入优先等级(CAPC)低的设备可能不适合共享信道接入优先等级高的设备发起的COT，因此可以根据信道接入优先等级(CAPC)值来判断是否共享COT。
又例如，可以根据上述条件的任意组合来判断是否共享COT。
这里“设备1是设备2的发送方”指设备1的目的ID(destination ID)是设备2感兴趣的ID。例如，设备1是单播的发送方，设备2是单播的接收方。又例如，设备1和设备2都是组播中同属于一个组的组员，设备1的目的ID是组ID(group ID)。“设备1是设备2的接收方”的含义同理可得。
换言之，设备可以在所有接收到的COT中确定能够用于共享的COT。将接收COT指示的设备称为第一设备(即共享COT的设备)。将发送COT指示的设备称为第二设备(即发起COT的设备)。第二设备也称为指示COT的设备。第一设备接收M个第二设备发送的M个COT指示，获得M个第一COT，其中，M≥1。第一设备在M个第一COT中确定N个第二COT(即共享的COT)，其中，1≤N≤M。
第一设备可以通过以下方式获得判断条件所需的信息。RSRP等于承载COT指示的PSCCH/PSSCH的RSRP。2nd stage SCI可以指示区域ID(Zone ID)，由此第一设备能够计算与第二设备之间的距离。2nd stage SCI可以指示Source ID和Destination ID，由此第一设备可以判断第二设备是自己的接收方或发送方。2nd stage SCI的cast  type indicator字段指示了cast type，由此第一设备可以获得第二设备的cast type。第一设备也可以基于2nd stage SCI的格式(SCI format 2-A或SCI format 2-B)获得第二设备的cast type，其中SCI format 2-B表示组播。第二设备通过发送信令指示CAPC，例如通过1st stage SCI或2nd stage SCI承载CAPC。
以图6为例，对设备确定用于共享的COT进行说明。
第一设备在时隙n 1接收到第二设备(设备1、设备2和设备3)发送的COT指示，从而获得COT#1、COT#2和COT#3；此外，第一设备可能还有在时隙n 1之前获得的COT。这些COT都称为第一COT。
在第一COT中，假设只有COT#1和COT#2满足至少一个第一条件。“COT满足至少一个第一条件”等价于“第一设备与指示该COT的第二设备满足至少一个第一条件”。因此，第一设备将COT#1和COT#2确定为第二COT。以条件“第一设备与指示第二COT的第二设备之间的RSRP大于门限”为例，在第一COT中，只有COT#1和COT#2的RSRP大于RSRP门限。
作为一种实施方式，RSRP门限是配置或预配置的。作为另外一种实施方式，RSRP门限是基于接收优先级和发送优先级确定的，例如，RSRP门限等于在资源选择过程(标准TS 38.214 V16.8.0的8.1.4节)中使用的门限Th(prioRX,prioTX)。
第一设备通过资源选择对第二COT进行共享。第一设备确定一个资源选择窗，该资源选择窗在时间上位于第二COT内。第一设备在资源选择窗内确定候选资源集合，在候选资源集合中选择候选资源。在LBT成功的情况下，第一设备在选择的候选资源上发送边链路信息。在不存在满足条件的COT的情况下，第一设备不共享COT。
在一些实施例中，第一设备在多于一个第二信道占用时间(COT)中选出一个用于获得候选资源集合的第三信道占用时间(COT)。
例如，在存在多于一个共享COT(第二COT)的情况下，第一设备可以进一步在其中选择一个COT作为共享COT。
在一些实施例中，第三信道占用时间(COT)由第三设备发送的COT指示所指示，第一设备与第三设备满足如下以下至少一个条件(第二条件)：
第一设备与第三设备之间的RSRP最高；
第一设备与第三设备之间的距离最小；
第三设备发送的COT指示所指示的COT结束时间最晚；
第三设备发送的COT指示所指示的COT结束时间最早。
例如，第一设备可以根据RSRP、距离、COT的结束时间中的至少之一进行选择。
依旧以图6为例对此进行说明。如前所述，COT#1和COT#2都是可以共享的COT。第一设备进一步选择结束时间最晚的COT#1作为共享的COT。相应地，第一设备确定的资源选择窗在时间上位于COT#1内。
由此，设备可以只共享满足一定条件的COT，而不是共享任何一个能够接收到的COT。通过这种方式，可以进一步避免设备过度占用非授权频段，从而避免对其他共存的设备造成干扰。
以上对于COT共享进行了说明，以下再对候选资源进行进一步说明。
在一些实施例中，候选资源集合不包括与第一资源重叠的至少部分候选资源，所述第一资源为被发送COT指示的第四设备预留的资源。
例如，发送COT指示的设备可能也会使用COT内的部分资源(第一资源)，因此设备在共享COT时要尽量避开这部分资源。例如，设备可以在确定候选资源集合时排除与这部分资源重叠的候选资源。
在一些实施例中，第一设备与第四设备满足以下至少一个条件(第一条件)：
第一设备与第四设备之间的RSRP大于第一门限；
第一设备与第四设备之间的距离小于第二门限；
第一设备是第四设备的边链路信息的发送方；
第一设备是第四设备的边链路信息的接收方；
第一设备与第四设备具有相同的传播类型(cast type)；
第一设备的信道接入优先等级(CAPC)值小于第四设备的信道接入优先等级(CAPC)值。
仍以图6为例对候选资源集合进行说明。如前所述，COT#1和COT#2满足至少一个第一条件。因此，设备1和设备2在COT#1和COT#2内预留的资源是第一资源。设备确定的候选资源集合不包括与第一资源重叠的候选资源。
在一些实施例中，被第四设备预留的资源包括被预留的时隙内的所有资源。
例如，第一资源也可能包括一个或多个时隙，即包括一个或多个时隙内的所有资源。以图6为例对第一设备确定的候选资源集合进行说明。COT#1和COT#2满足至少一个第一条件。
此外，假设设备1是第一设备的发送方，并且设备1是第一设备的接收方，即第一设备需要向设备1发送边链路信息。在这种情况下，第一资源包括设备1在COT#1内预留的资源所在的时隙，即设备1的发送时隙。受半双工限制，设备1在进行发送的时隙无法进行接收，因此，第一设备要避免在设备1进行发送的时隙向设备1发送边链路信息。因此，第一设备确定的候选资源集合不包括与设备1的发送时隙重叠的候选资源，即避开整个时隙。
假设设备2与第一设备之间不存在收发关系。在这种情况下，第一资源还包括设备2在COT#2内预留的资源。第一设备在向设备1发送时，要避免对设备2的干扰，因此，第一设备要避免在设备2预留的资源上进行发送。因此，第一设备确定的候选资源集合不包括与设备2预留的资源重叠的候选资源，即避开时频资源。
在一些实施例中，候选资源集合不包括与第二资源重叠的至少部分候选资源，所述第二资源为被预留的资源且对应的RSRP大于第四门限(RSRP门限)。
例如，对于除第一资源以外的其他预留资源，如果预留资源的RSRP大于第四门限，则候选资源集合也不包括与该预留资源重叠的候选资源。
以下再对资源选择过程进行进一步说明，资源选择的具体内容还可参考现有技术。
在一些实施例中，第一设备在候选资源集合中的资源数目小于第三门限(数目门限)的情况下，将满足如下条件的候选资源加入候选资源集合：候选资源不与第一资源重叠；所述候选资源与第二资源重叠、且所述第二资源的RSRP小于提升的第四门限(RSRP门限)。
例如，对于除第一资源以外的其他预留资源，如果预留资源的RSRP大于RSRP门限，则候选资源集合也不包括与该预留资源重叠的候选资源。此外，在候选资源集合中的资源数不足的情况下，设备可以对RSRP门限进行提升。
图7是本申请实施例的资源选择的一示意图，示意性示出了设备的物理层进行资源选择的一些情况。如图7所示，该资源选择包括：
701，将S A初始化为包括所有候选资源的集合；
702，从S A中排除与第二资源重叠的候选资源；其中，第二资源是被预留的资源，并且第二资源的RSRP大于第四门限Th；
703，从S A中排除与第一资源重叠的候选资源；其中，第一资源是被发送COT指示信息的设备预留的资源，并且COT指示信息指示的COT满足至少一个第一条件；
704，确定候选资源集合中的资源数目是否小于第三门限；如果为否，则执行705，如果为是，则执行706；
705，将S A上报给高层；
706，将第四门限Th提升若干dB。
例如，设备可以按照图7确定候选资源集合S A。图7只作为本申请的一种示例，本申请实施例并不限制设备执行其他步骤。此外，图7中702和703的顺序可以互换。在执行完703后，候选资源集合不包括与第一资源和第二资源重叠的候选资源。在候选资源集合中的资源数小于第三门限的情况下，设备提升RSRP门限，例如将RSRP门限提升3dB，然后重新从701开始执行。
通过提升RSRP门限，一些之前被排除的与第二资源重叠的候选资源就有可能成为候选资源，从而使候选资源集合中的资源数增加。这里，第三门限(数目门限)例如是候选资源总数的20％，第四门限(RSRP门限)例如等于在资源选择过程(标准TS 38.214 V16.8.0的8.1.4节)中使用的门限Th(prioRX,prioTX)。
在一些实施例中，第一设备在候选资源集合中的资源数目小于第三门限的情况下，将满足如下条件的候选资源加入候选资源集合：候选资源与第一资源重叠。
例如，设备优先选择同时满足以下条件的候选资源集合：
--候选资源集合不包括与第一资源和第二资源重叠的候选资源；
--候选资源集合中的资源数不小于第三门限(数目门限)。
如果设备选择不出满足上述条件的候选资源集合，如前所述，设备提升RSRP门限，将与第二资源重叠的候选资源补充进候选资源集合。如果仍然选择不出满足资源数要求的候选资源集合，设备将与第一资源重叠的候选资源补充进候选资源集合。以图7为例，在候选资源集合中的资源数目无法通过提升RSRP门限得到满足的情况下，设备将与第一资源重叠的候选资源补充进候选资源集合。
图8是本申请实施例的资源选择的另一示意图，示意性示出了设备的物理层进行资源选择的另一些情况。如图8所示，该资源选择包括：
801，将S A初始化为包括所有候选资源的集合；
802，从S A中排除与第一资源重叠的候选资源；其中，第一资源是被发送COT指示信息的设备预留的资源，并且COT指示信息指示的COT满足至少一个第一条件；
803，如果候选资源集合中的资源数目小于第三门限(数目门限)，将S A初始化 为包括所有候选资源的集合；
804，从S A中排除与第二资源重叠的候选资源；其中，第二资源是被预留的资源，并且第二资源的RSRP大于第四门限Th；
805，确定候选资源集合中的资源数目是否小于第三门限(数目门限)；如果为否，则执行806，如果为是，则执行807；
806，将S A上报给高层；
807，将第四门限Th提升若干dB。
例如，作为另外一种实施方式，设备可按照图8确定候选资源集合S A。在执行802后，设备判断候选资源集合中的资源数目是否小于第三门限。在资源数目小于第三门限的情况下，设备将S A重新初始化为包括所有候选资源的集合，然后执行后续的804。这相当于回退到不区别对待第一资源的第二资源的情形，对所有预留资源都基于RSRP大小进行处理。
由此，设备优先保护发起COT的设备不受干扰，符合COT共享的初衷。另外，本申请的这些实施例也有利于提高COT指示传输的可靠性，有利于COT被更多设备正确接收，从而使COT得到充分的共享。相比之下，传统的mode 2资源选择不会区别对待发起COT的设备，无法保证理想的COT共享。
在一些实施例中，第一设备在信道占用时间(COT)之外监听(monitor)物理边链路控制信道(PSCCH)的频次大于在信道占用时间(COT)之内监听(monitor)物理边链路控制信道(PSCCH)的频次。
例如，设备需要监听PSCCH以接收数据。根据前面所述的方法，设备可以确定某一监听时刻是否位于COT内。设备可以利用这一信息确定监听PSCCH的行为。受LBT的影响，COT外的发送具有更高的不确定性，因此设备可以在COT外更加频繁地监听PSCCH。
例如，设备周期性监听PSCCH，设备在COT外监听PSCCH的周期小于在COT内监听PSCCH的周期。例如，在单位时间(一个或多个时隙)内，设备在COT外监听PSCCH的次数为H1，在COT内监听PSCCH的次数为H2，H1>H2。
换句话说，设备在COT外监听PSCCH的频次(或频率)大于在COT内监听PSCCH的频次(或频率)。这里的“频率”例如是指单位时间内的次数，不同于“时间频率资源”中的“频率”。
以上从第一设备的角度对本申请实施例进行了说明，对于其他设备(前述的第二设备至第四设备)，可以进行与第一设备相同或者相应的操作。
例如，第二设备在非授权频段上进行先听后发(LBT)；根据所述先听后发(LBT)获得信道占用时间(COT)；以及发送包括所述信道占用时间(COT)的信息的COT指示。
此外，以上为了方便描述，接收COT指示的设备为第一设备，发送COT指示的设备包括第二设备至第四设备，本申请实施例中的第二设备至第四设备可以是相同的一个设备，也可以是不同的多个设备，本申请实施例不对此进行限制。
以上各个实施例仅对本申请实施例进行了示例性说明，但本申请不限于此，还可以在以上各个实施例的基础上进行适当的变型。例如，可以单独使用上述各个实施例，也可以将以上各个实施例中的一种或多种结合起来。
由上述实施例可知，在非授权频段上根据信道占用时间(COT)确定候选资源集合，在候选资源集合中选择发送资源；以及在针对边链路发送的LBT成功的情况下，在发送资源上发送边链路信息。由此，使用边链路通信的设备能够高效地竞争和使用非授权频段，并能够与其他使用非授权频段的设备公平地共存。
第二方面的实施例
本申请实施例提供一种边链路传输装置。该装置例如可以是终端设备(例如前述的第一设备)，也可以是配置于终端设备的某个或某些部件或者组件，与第一方面的实施例相同的内容不再赘述。
图9是本申请实施例的边链路传输装置的一示意图。如图9所示，边链路传输装置900包括：
确定单元901，其在非授权频段上根据信道占用时间确定候选资源集合；
选择单元902，其在所述候选资源集合中选择发送资源；以及
发送单元903，其在针对边链路发送的先听后发成功的情况下，在所述发送资源上发送边链路信息。
在一些实施例中，信道占用时间通过第一设备接收到的COT指示而获得。
在一些实施例中，信道占用时间通过第一设备进行先听后发而获得。
在一些实施例中，发送单元903还用于发送包括信道占用时间信息的COT指示。
在一些实施例中，用于确定候选资源集合的资源选择窗根据信道占用时间确定。
在一些实施例中，包括确定候选资源集合的资源选择过程由第一设备根据高层请求触发，或者，由第一设备根据信道占用时间触发。
在一些实施例中，第一设备预留的资源与用于发送预留指示的资源位于相同的信道占用时间内，或者，位于相同的资源选择窗内。
在一些实施例中，在根据包括包延迟预算的信息确定的第一资源选择窗内，确定单元901根据信道占用时间确定一个或多个第二资源选择窗。
在一些实施例中，如图9所示，边链路传输装置900还包括：
接收单元904，其接收一个或多个指示第一信道占用时间的COT指示；
确定单元901还用于根据一个或多个第一信道占用时间和/或通过第一设备进行先听后发获得的信道占用时间确定用于获得候选资源集合的第二信道占用时间。
在一些实施例中，第二信道占用时间由第二设备发送的COT指示所指示，所述第一设备与所述第二设备满足以下至少一个条件：
所述第一设备与所述第二设备之间的RSRP大于第一门限；
所述第一设备与所述第二设备之间的距离小于第二门限；
所述第一设备是所述第二设备的边链路信息的发送方；
所述第一设备是所述第二设备的边链路信息的接收方；
所述第一设备与所述第二设备具有相同的传播类型；
所述第一设备的信道接入优先等级值小于所述第二设备的信道接入优先等级值。
在一些实施例中，选择单元902还用于在多于一个第二信道占用时间中选出一个用于获得候选资源集合的第三信道占用时间。
在一些实施例中，第三信道占用时间由第三设备发送的COT指示所指示，所述第一设备与所述第三设备满足如下以下至少一个条件：
所述第一设备与所述第三设备之间的RSRP最高；
所述第一设备与所述第三设备之间的距离最小；
所述第三设备发送的COT指示所指示的COT结束时间最晚；
所述第三设备发送的COT指示所指示的COT结束时间最早。
在一些实施例中，候选资源集合不包括与第一资源重叠的至少部分候选资源，所述第一资源为被发送COT指示的第四设备预留的资源。
在一些实施例中，被第四设备预留的资源包括被预留的时隙内的所有资源。
在一些实施例中，第一设备与所述第四设备满足以下至少一个条件：
所述第一设备与所述第四设备之间的RSRP大于第一门限；
所述第一设备与所述第四设备之间的距离小于第二门限；
所述第一设备是所述第四设备的边链路信息的发送方；
所述第一设备是所述第四设备的边链路信息的接收方；
所述第一设备与所述第四设备具有相同的传播类型；
所述第一设备的信道接入优先等级值小于所述第四设备的信道接入优先等级值。
在一些实施例中，候选资源集合不包括与第二资源重叠的至少部分候选资源，所述第二资源为被预留的资源且对应的RSRP大于第四门限。
在一些实施例中，确定单元901还用于：在候选资源集合中的资源数目小于第三门限的情况下，将满足如下条件的候选资源加入所述候选资源集合：所述候选资源不与所述第一资源重叠；所述候选资源与所述第二资源重叠、且所述第二资源的RSRP小于提升的第四门限。
在一些实施例中，确定单元901还用于：在候选资源集合中的资源数目小于第三门限的情况下，将满足如下条件的候选资源加入所述候选资源集合：所述候选资源与所述第一资源重叠。
在一些实施例中，在所述信道占用时间之外监听物理边链路控制信道的频次大于在所述信道占用时间之内监听物理边链路控制信道的频次。
以上各个实施例仅对本申请实施例进行了示例性说明，但本申请不限于此，还可以在以上各个实施例的基础上进行适当的变型。例如，可以单独使用上述各个实施例，也可以将以上各个实施例中的一种或多种结合起来。
值得注意的是，以上仅对与本申请相关的各部件或模块进行了说明，但本申请不限于此。边链路传输装置900还可以包括其他部件或者模块，关于这些部件或者模块的具体内容，可以参考相关技术。
此外，为了简单起见，图9中仅示例性示出了各个部件或模块之间的连接关系或信号走向，但是本领域技术人员应该清楚的是，可以采用总线连接等各种相关技术。上述各个部件或模块可以通过例如处理器、存储器、发射机、接收机等硬件设施来实现；本申请实施并不对此进行限制。
由上述实施例可知，在非授权频段上根据信道占用时间(COT)确定候选资源集合，在候选资源集合中选择发送资源；以及在针对边链路发送的LBT成功的情况下，在发送资源上发送边链路信息。由此，使用边链路通信的设备能够高效地竞争和使用非授权频段，并能够与其他使用非授权频段的设备公平地共存。
第三方面的实施例
本申请实施例还提供一种通信系统，可以参考图1，与第一、二方面的实施例相同的内容不再赘述。
在一些实施例中，通信系统100至少可以包括：
终端设备，其在非授权频段上根据信道占用时间确定候选资源集合；在所述候选资源集合中选择发送资源；以及在针对边链路发送的先听后发成功的情况下，在所述发送资源上发送边链路信息。
本申请实施例还提供一种网络设备，例如可以是基站，但本申请不限于此，还可以是其他的网络设备。
图10是本申请实施例的网络设备的构成示意图。如图10所示，网络设备1000可以包括：处理器1010(例如中央处理器CPU)和存储器1020；存储器1020耦合到处理器1010。其中该存储器1020可存储各种数据；此外还存储信息处理的程序1030，并且在处理器1010的控制下执行该程序1030。例如，处理器1010可以被配置为执行程序而向终端设备发送如下至少之一或任意组合：消息/配置/信息/信令/指示，使得所述终端设备实现如第一方面的实施例所述的边链路传输方法。
此外，如图10所示，网络设备1000还可以包括：收发机1040和天线1050等；其中，上述部件的功能与现有技术类似，此处不再赘述。值得注意的是，网络设备1000也并不是必须要包括图10中所示的所有部件；此外，网络设备1000还可以包括图10中没有示出的部件，可以参考现有技术。
本申请实施例还提供一种终端设备，但本申请不限于此，还可以是其他的设备。
图11是本申请实施例的终端设备的示意图。如图11所示，该终端设备1100可以包括处理器1110和存储器1120；存储器1120存储有数据和程序，并耦合到处理器1110。值得注意的是，该图是示例性的；还可以使用其他类型的结构，来补充或代替该结构，以实现电信功能或其他功能。
例如，处理器1110可以被配置为执行程序而实现如第一方面的实施例所述的边链路传输方法。例如处理器1110可以被配置为进行如下的控制：在非授权频段上根据信道占用时间(COT)确定候选资源集合；在所述候选资源集合中选择发送资源；以及在针对边链路发送的先听后发(LBT)成功的情况下，在所述发送资源上发送边链路信息。
如图11所示，该终端设备1100还可以包括：通信模块1130、输入单元1140、显示器1150、电源1160。其中，上述部件的功能与现有技术类似，此处不再赘述。值得注意的是，终端设备1100也并不是必须要包括图11中所示的所有部件，上述部件并不是必需的；此外，终端设备1100还可以包括图11中没有示出的部件，可以参考现有技术。
本申请实施例还提供一种计算机程序，其中当在终端设备中执行所述程序时，所述程序使得所述终端设备执行第一方面的实施例所述的边链路传输方法。
本申请实施例还提供一种存储有计算机程序的存储介质，其中所述计算机程序使得终端设备执行第一方面的实施例所述的边链路传输方法。
本申请以上的装置和方法可以由硬件实现，也可以由硬件结合软件实现。本申请涉及这样的计算机可读程序，当该程序被逻辑部件所执行时，能够使该逻辑部件实现上文所述的装置或构成部件，或使该逻辑部件实现上文所述的各种方法或步骤。本申请还涉及用于存储以上程序的存储介质，如硬盘、磁盘、光盘、DVD、flash存储器等。
结合本申请实施例描述的方法/装置可直接体现为硬件、由处理器执行的软件模块或二者组合。例如，图中所示的功能框图中的一个或多个和/或功能框图的一个或多个组合，既可以对应于计算机程序流程的各个软件模块，亦可以对应于各个硬件模块。这些软件模块，可以分别对应于图中所示的各个步骤。这些硬件模块例如可利用现场可编程门阵列(FPGA)将这些软件模块固化而实现。
软件模块可以位于RAM存储器、闪存、ROM存储器、EPROM存储器、EEPROM存储器、寄存器、硬盘、移动磁盘、CD-ROM或者本领域已知的任何其它形式的存储介质。可以将一种存储介质耦接至处理器，从而使处理器能够从该存储介质读取信息，且可向该存储介质写入信息；或者该存储介质可以是处理器的组成部分。处理器和存储介质可以位于ASIC中。该软件模块可以存储在移动终端的存储器中，也可以存储在可插入移动终端的存储卡中。例如，若设备(如移动终端)采用的是较大容量 的MEGA-SIM卡或者大容量的闪存装置，则该软件模块可存储在该MEGA-SIM卡或者大容量的闪存装置中。
针对附图中描述的功能方框中的一个或多个和/或功能方框的一个或多个组合，可以实现为用于执行本申请所描述功能的通用处理器、数字信号处理器(DSP)、专用集成电路(ASIC)、现场可编程门阵列(FPGA)或者其它可编程逻辑器件、分立门或者晶体管逻辑器件、分立硬件组件或者其任意适当组合。针对附图描述的功能方框中的一个或多个和/或功能方框的一个或多个组合，还可以实现为计算设备的组合，例如，DSP和微处理器的组合、多个微处理器、与DSP通信结合的一个或多个微处理器或者任何其它这种配置。
以上结合具体的实施方式对本申请进行了描述，但本领域技术人员应该清楚，这些描述都是示例性的，并不是对本申请保护范围的限制。本领域技术人员可以根据本申请的精神和原理对本申请做出各种变型和修改，这些变型和修改也在本申请的范围内。
关于包括以上实施例的实施方式，还公开下述的附记：
1.一种边链路传输方法，包括：
第一设备在非授权频段上根据信道占用时间(COT)确定候选资源集合；
在所述候选资源集合中选择发送资源；以及
在针对边链路发送的先听后发(LBT)成功的情况下，在所述发送资源上发送边链路信息。
2.根据附记1所述的方法，其中，所述信道占用时间(COT)通过所述第一设备接收到的COT指示而获得。
3.根据附记1所述的方法，其中，所述信道占用时间(COT)通过所述第一设备进行先听后发(LBT)而获得。
4.根据附记3所述的方法，其中，所述方法还包括：
所述第一设备发送包括所述信道占用时间(COT)的信息的COT指示。
5.根据附记1至4任一项所述的方法，其中，用于确定所述候选资源集合的资源选择窗根据所述信道占用时间(COT)确定。
6.根据附记1至5任一项所述的方法，其中，包括确定所述候选资源集合的资源选择过程由所述第一设备根据高层请求触发，或者，由所述第一设备根据所述信道 占用时间(COT)触发。
7.根据附记1至6任一项所述的方法，其中，所述第一设备预留的资源与用于发送预留指示的资源位于相同的信道占用时间(COT)内，或者，位于相同的资源选择窗内。
8.根据附记1至7任一项所述的方法，其中，在根据包括包延迟预算(PDB)的信息确定的第一资源选择窗内，所述第一设备根据所述信道占用时间(COT)确定一个或多个第二资源选择窗。
9.根据附记1至8任一项所述的方法，其中，所述方法还包括：
所述第一设备接收一个或多个指示第一信道占用时间(COT)的COT指示；
根据所述一个或多个第一信道占用时间(COT)和/或通过进行先听后发(LBT)获得的信道占用时间(COT)确定用于获得所述候选资源集合的第二信道占用时间(COT)。
10.根据附记9所述的方法，其中，所述第二信道占用时间(COT)由第二设备发送的COT指示所指示，所述第一设备与所述第二设备满足以下至少一个条件：
所述第一设备与所述第二设备之间的RSRP大于第一门限；
所述第一设备与所述第二设备之间的距离小于第二门限；
所述第一设备是所述第二设备的边链路信息的发送方；
所述第一设备是所述第二设备的边链路信息的接收方；
所述第一设备与所述第二设备具有相同的传播类型(cast type)；
所述第一设备的信道接入优先等级(CAPC)值小于所述第二设备的信道接入优先等级(CAPC)值。
11.根据附记9或10所述的方法，其中，所述方法还包括：
所述第一设备在多于一个所述第二信道占用时间(COT)中选出一个用于获得所述候选资源集合的第三信道占用时间(COT)。
12.根据附记11所述的方法，其中，所述第三信道占用时间(COT)由第三设备发送的COT指示所指示，所述第一设备与所述第三设备满足如下以下至少一个条件：
所述第一设备与所述第三设备之间的RSRP最高；
所述第一设备与所述第三设备之间的距离最小；
所述第三设备发送的COT指示所指示的COT结束时间最晚；
所述第三设备发送的COT指示所指示的COT结束时间最早。
13.根据附记1至12任一项所述的方法，其中，所述候选资源集合不包括与第一资源重叠的至少部分候选资源，所述第一资源为被发送COT指示的第四设备预留的资源。
14.根据附记13所述的方法，其中，被所述第四设备预留的资源包括被所述第四设备预留的时隙内的所有资源。
15.根据附记13或14所述的方法，其中，所述第一设备与所述第四设备满足以下至少一个条件：
所述第一设备与所述第四设备之间的RSRP大于第一门限；
所述第一设备与所述第四设备之间的距离小于第二门限；
所述第一设备是所述第四设备的边链路信息的发送方；
所述第一设备是所述第四设备的边链路信息的接收方；
所述第一设备与所述第四设备具有相同的传播类型(cast type)；
所述第一设备的信道接入优先等级(CAPC)值小于所述第四设备的信道接入优先等级(CAPC)值。
16.根据附记13至15任一项所述的方法，其中，所述候选资源集合不包括与第二资源重叠的至少部分候选资源，所述第二资源为被预留的资源且对应的RSRP大于第四门限。
17.根据附记16所述的方法，其中，所述方法还包括：
所述第一设备在候选资源集合中的资源数目小于第三门限的情况下，将满足如下条件的候选资源加入所述候选资源集合：所述候选资源不与所述第一资源重叠；所述候选资源与所述第二资源重叠、且所述第二资源的RSRP小于提升的第四门限。
18.根据附记16所述的方法，其中，所述方法还包括：
所述第一设备在候选资源集合中的资源数目小于第三门限的情况下，将满足如下条件的候选资源加入所述候选资源集合：所述候选资源与所述第一资源重叠。
19.根据附记1至18任一项所述的方法，其中，所述第一设备在所述信道占用时间(COT)之外监听(monitor)物理边链路控制信道(PSCCH)的频次大于在所述信道占用时间(COT)之内监听(monitor)物理边链路控制信道(PSCCH)的频 次。
20.一种边链路传输方法，包括：
第二设备在非授权频段上进行先听后发(LBT)；
根据所述先听后发(LBT)获得信道占用时间(COT)；以及
发送包括所述信道占用时间(COT)的信息的COT指示。
21.一种边链路传输方法，包括：
第一设备获得在非授权频段上的信道占用时间(COT)；以及
所述第一设备监听物理边链路控制信道(PSCCH)；
其中，在所述信道占用时间(COT)之外监听(monitor)物理边链路控制信道(PSCCH)的频次大于在所述信道占用时间(COT)之内监听(monitor)物理边链路控制信道(PSCCH)的频次。
22.根据附记21所述的方法，其中，所述信道占用时间(COT)通过所述第一设备接收到的COT指示而获得。
23.根据附记21所述的方法，其中，所述信道占用时间(COT)通过所述第一设备进行先听后发(LBT)而获得。
24.一种终端设备，包括存储器和处理器，所述存储器存储有计算机程序，所述处理器被配置为执行所述计算机程序而实现如附记1至23任一项所述的边链路传输方法。

Claims (20)

  1. 一种边链路传输装置，包括：
    确定单元，其在非授权频段上根据信道占用时间确定候选资源集合；
    选择单元，其在所述候选资源集合中选择发送资源；以及
    发送单元，其在针对边链路发送的先听后发成功的情况下，在所述发送资源上发送边链路信息。
  2. 根据权利要求1所述的装置，其中，所述信道占用时间通过第一设备接收到的COT指示而获得。
  3. 根据权利要求1所述的装置，其中，所述信道占用时间通过第一设备进行先听后发而获得。
  4. 根据权利要求3所述的装置，其中，所述发送单元还用于发送包括所述信道占用时间的信息的COT指示。
  5. 根据权利要求1所述的装置，其中，用于确定所述候选资源集合的资源选择窗根据所述信道占用时间确定。
  6. 根据权利要求1所述的装置，其中，包括确定所述候选资源集合的资源选择过程由第一设备根据高层请求触发，或者，由所述第一设备根据所述信道占用时间触发。
  7. 根据权利要求1所述的装置，其中，第一设备预留的资源与用于发送预留指示的资源位于相同的信道占用时间内，或者，位于相同的资源选择窗内。
  8. 根据权利要求1所述的装置，其中，在根据包括包延迟预算的信息确定的第一资源选择窗内，所述确定单元根据所述信道占用时间确定一个或多个第二资源选择窗。
  9. 根据权利要求1所述的装置，其中，所述装置还包括：
    接收单元，其接收一个或多个指示第一信道占用时间的COT指示；
    所述确定单元还用于根据所述一个或多个第一信道占用时间和/或通过第一设备进行先听后发获得的信道占用时间确定用于获得所述候选资源集合的第二信道占用时间。
  10. 根据权利要求9所述的装置，其中，所述第二信道占用时间由第二设备发送 的COT指示所指示，所述第一设备与所述第二设备满足以下至少一个条件：
    所述第一设备与所述第二设备之间的参考信号接收功率大于第一门限；
    所述第一设备与所述第二设备之间的距离小于第二门限；
    所述第一设备是所述第二设备的边链路信息的发送方；
    所述第一设备是所述第二设备的边链路信息的接收方；
    所述第一设备与所述第二设备具有相同的传播类型；
    所述第一设备的信道接入优先等级值小于所述第二设备的信道接入优先等级值。
  11. 根据权利要求9所述的装置，其中，所述选择单元还用于在多于一个所述第二信道占用时间中选出一个用于获得所述候选资源集合的第三信道占用时间。
  12. 根据权利要求11所述的装置，其中，所述第三信道占用时间由第三设备发送的COT指示所指示，所述第一设备与所述第三设备满足如下以下至少一个条件：
    所述第一设备与所述第三设备之间的参考信号接收功率最高；
    所述第一设备与所述第三设备之间的距离最小；
    所述第三设备发送的COT指示所指示的COT结束时间最晚；
    所述第三设备发送的COT指示所指示的COT结束时间最早。
  13. 根据权利要求1所述的装置，其中，所述候选资源集合不包括与第一资源重叠的至少部分候选资源，所述第一资源为被发送COT指示的第四设备预留的资源。
  14. 根据权利要求13所述的装置，其中，被所述第四设备预留的资源包括被所述第四设备预留的时隙内的所有资源。
  15. 根据权利要求13所述的装置，其中，第一设备与所述第四设备满足以下至少一个条件：
    所述第一设备与所述第四设备之间的参考信号接收功率大于第一门限；
    所述第一设备与所述第四设备之间的距离小于第二门限；
    所述第一设备是所述第四设备的边链路信息的发送方；
    所述第一设备是所述第四设备的边链路信息的接收方；
    所述第一设备与所述第四设备具有相同的传播类型；
    所述第一设备的信道接入优先等级值小于所述第四设备的信道接入优先等级值。
  16. 根据权利要求13所述的装置，其中，所述候选资源集合不包括与第二资源重叠的至少部分候选资源，所述第二资源为被预留的资源且对应的参考信号接收功率 大于第四门限。
  17. 根据权利要求16所述的装置，其中，所述确定单元还用于：在候选资源集合中的资源数目小于第三门限的情况下，将满足如下条件的候选资源加入所述候选资源集合：
    所述候选资源不与所述第一资源重叠；所述候选资源与所述第二资源重叠、且所述第二资源的参考信号接收功率小于提升的第四门限；
    和/或，
    所述候选资源与所述第一资源重叠。
  18. 根据权利要求1所述的装置，其中，在所述信道占用时间之外监听物理边链路控制信道的频次大于在所述信道占用时间之内监听物理边链路控制信道的频次。
  19. 一种边链路传输方法，包括：
    第一设备在非授权频段上根据信道占用时间确定候选资源集合；
    在所述候选资源集合中选择发送资源；以及
    在针对边链路发送的先听后发成功的情况下，在所述发送资源上发送边链路信息。
  20. 一种通信系统，包括：
    终端设备，其在非授权频段上根据信道占用时间确定候选资源集合；在所述候选资源集合中选择发送资源；以及在针对边链路发送的先听后发成功的情况下，在所述发送资源上发送边链路信息。
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