Method for sharing channel occupancy time and terminal equipment thereof

Abstract

The invention discloses a method for sharing channel occupation time and terminal equipment thereof. The method comprises the following steps: a second terminal device receives resource indication information sent by a first terminal device, and determines a transmission resource indicated by the first terminal device according to the resource indication information; the second terminal device performs listen before talk (LBT) according to the indicated transmission resource; and if the LBT of the second terminal device is successful, sharing the channel occupancy time COT with the first terminal device. According to the method, a second terminal device carries out LBT and shares the obtained channel occupation time COT to a first terminal device, and the first terminal device carries out channel access according to the COT. Therefore, the problem that other terminal devices near the first terminal device and the second terminal device are hidden terminals for each other is solved, and the communication reliability is improved.

Description

Technical Field

[0001] The present invention relates to the field of communication technology, and in particular to the field of sidelink transmission technology. Background Art

[0002] Sidelink transmission refers to the direct transmission between terminal devices through sidelink (SL), which is different from the way in which communication data is received or sent by base stations in traditional cellular systems. V2X (Vehicle to Everything) systems also support sidelink transmission, namely V2V (Vehicle to Vehicle). Therefore, sidelink transmission has higher spectrum efficiency and lower transmission delay.

[0003] In addition, some countries and regions will allocate a portion of the spectrum for shared radio equipment communications, namely unlicensed spectrum. As long as the communication equipment in different communication systems meets the regulatory requirements set by the country or region on the spectrum, they can use the spectrum without applying for exclusive spectrum authorization from the government. For example, the WIFI system is deployed on the unlicensed spectrum. Since the unlicensed spectrum can be used without government authorization, the LBT (Listen Before Talk) mechanism must be followed in the use of the unlicensed spectrum.

[0004] In the unlicensed spectrum, all communication devices must perform LBT before sending signals. That is, before a communication device sends a signal on a channel in the unlicensed spectrum, it needs to monitor the channel first. Only when the channel monitoring result shows that the channel is idle can the communication device send a signal. Therefore, when the terminal device on the side link works in the unlicensed frequency band, the UE on the side link also needs to perform LBT. Only when LBT is successful can it access the channel and send data.

[0005] However, in the unlicensed sidelink transmission SL-U system, the hidden station problem is common. For example, UE 1 communicates with UE 2, and UE 3 communicates with UE 4. UE 1 and UE 3 are far away from each other. During the LBT process, they cannot sense that the other party is occupying the channel, and the monitoring is idle, so they both successfully access the channel. When UE 1 and UE 3 access the channel for transmission at the same time, UE 3's transmission will interfere with the transmission from UE 1 to UE 2, resulting in reduced communication reliability. Summary of the invention

[0006] The invention provides a method for sharing channel occupancy time and terminal equipment thereof.

[0007] The present invention provides the following technical solutions:

[0008] On the one hand, a method for sharing channel occupancy time is provided, which includes a second terminal device receiving resource indication information sent by a first terminal device, and determining a transmission resource indicated by the first terminal device according to the resource indication information; the second terminal device performs listen-before-talk LBT according to the indicated transmission resource;

[0009] If the LBT of the second terminal device is successful, the channel occupation time COT is shared with the first terminal device.

[0010] On the other hand, a method for sharing channel occupancy time is provided, which includes a first terminal device sending resource indication information for indicating transmission resources; the first terminal device obtains the channel occupancy time COT shared by the second terminal device, and the channel occupancy time is shared with the first terminal device after the second terminal device successfully performs listen-before-talk LBT according to the transmission resources indicated by the resource indication information; the first terminal device performs channel access according to the COT shared by the second terminal device.

[0011] On the other hand, a terminal device is provided for sharing channel occupancy time; it includes a resource determination unit, which is used to receive resource indication information sent by a first terminal device, and determine the transmission resources indicated by the first terminal device according to the resource indication information; a monitoring unit, which is used to perform listen-before-talk LBT according to the indicated transmission resources; and a sharing unit, which is used to share the channel occupancy time COT with the first terminal device if the LBT of the monitoring unit is successful.

[0012] On the other hand, a terminal device is provided for receiving shared channel occupancy time; it includes: a sending unit for sending resource indication information, wherein the resource indication information is used to indicate transmission resources; an acquisition unit for obtaining the channel occupancy time COT shared by the second terminal device, wherein the channel occupancy time is shared with the sending unit after the second terminal device successfully performs listen-before-talk LBT according to the transmission resources indicated by the resource indication information; an access unit for performing channel access according to the COT shared by the second terminal device.

[0013] On the other hand, a terminal device for sharing channel occupancy time is provided, which includes: a processor, a memory and a network interface; the processor calls the program in the memory, executes any specific implementation method of the method for sharing channel occupancy time in the present application, and sends the execution result through the network interface.

[0014] On the other hand, a chip is provided, including: a processor, used to call and run a computer program from a memory, and a device equipped with the chip executes a specific implementation of any method of sharing channel occupancy time in the present application.

[0015] On the other hand, a computer-readable storage medium is provided, on which a program for an uplink transmission method is stored, and the program for the uplink transmission method is executed by a processor as a specific implementation of any method for sharing channel occupancy time of the present application.

[0016] On the other hand, a computer program product is provided. The computer program product is stored in a non-transitory computer-readable storage medium, and the computer program is executed to execute any specific implementation of the method for sharing channel occupancy time of the present application.

[0017] On the other hand, a computer program is provided, wherein the computer program is executed to implement any specific implementation of the method for sharing channel occupancy time of the present application.

[0018] The beneficial effect of the present invention is that the second terminal device performs LBT according to the transmission resources indicated by the first terminal device; if the second terminal device LBT is successful, the obtained channel occupation time COT is shared with the first terminal device, and the first terminal device performs channel access according to the COT. In this way, the first terminal device and other terminal devices near the second terminal device will not form mutually hidden terminals, that is, the problem of hidden terminals is solved and the communication reliability is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1A and Figure 1B This is a system architecture diagram for the implementation scheme of this application.

[0020] Figure 2 This is an application scenario of an implementation method of this application.

[0021] Figure 3 A flowchart of a method for sharing channel occupancy time provided in the first embodiment of the present application.

[0022] Figure 4 Schematic diagram of different channel access schemes for base stations to share COT in different scenarios.

[0023] Figure 5 This is a specific example of implementation mode 1 of the present application.

[0024] Figure 6 A module diagram of a terminal device provided for implementation mode 2 of the present application.

[0025] Figure 7 A module diagram of a terminal device provided for implementation mode 3 of the present application.

[0026] Figure 8A schematic diagram of the structure of a terminal device provided for implementation mode 4 of the present application. DETAILED DESCRIPTION

[0027] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the embodiments described herein are only used to explain the present invention and are not intended to limit the present invention. However, the present invention can be implemented in a variety of different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the understanding of the disclosure of the present invention more thorough and comprehensive.

[0028] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used in the specification of the present invention herein are only for the purpose of describing specific embodiments and are not intended to limit the present invention.

[0029] It should be understood that the terms "system" or "network" are often used interchangeably herein. The term "and / or" herein is merely a description of the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B may represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " herein generally indicates that the associated objects before and after are in an "or" relationship.

[0030] The embodiments of the present application can be applied to various communication systems, such as: Global System of Mobile communication (GSM) system, Code Division Multiple Access (CDMA) system, Wideband Code Division Multiple Access (WCDMA) system, General Packet Radio Service (GPRS), Long Term Evolution (LTE) system, Advanced long term evolution (LTE-A) system, New Radio (NR) system, NR system evolution system, LTE on unlicensed spectrum (LTE-based access to unlicensed spectrum, LTE-U) system, NR on unlicensed spectrum (NR-based access to unlicensed spectrum, NR-U) system, Universal Mobile Telecommunication System (UMTS), Wireless Local Area Networks (WLAN), Wireless Fidelity (WiFi), next generation communication system or other communication systems, etc.

[0031] Generally speaking, traditional communication systems support a limited number of connections and are easy to implement. However, with the development of communication technology, mobile communication systems will not only support traditional communications, but will also support, for example, device to device (Device to Device, D2D) communication, machine to machine (Machine to Machine, M2M) communication, machine type communication (Machine Type Communication, MTC), and vehicle to vehicle (Vehicle to Vehicle, V2V) communication, etc. The embodiments of the present application can also be applied to these communication systems.

[0032] Optionally, the communication system in the embodiment of the present application can be applied to a carrier aggregation (CA) scenario, a dual connectivity (DC) scenario, or a standalone (SA) networking scenario.

[0033] The embodiments of the present application do not limit the spectrum to which they are applied. For example, the embodiments of the present application can be applied to licensed spectrum or unlicensed spectrum.

[0034] Please see Figure 1A and Figure 1B , which shows a wireless communication system 100 to which the embodiment of the present application is applied. The wireless communication system 100 is a sidelink transmission system.

[0035] Regarding sidelink transmission, 3GPP (3rd Generation Partnership Project) defines two transmission modes: Mode A and Mode B.

[0036] Mode A: Figure 1A As shown, the terminal device 120 is a side link terminal device SL UE, and its transmission resources are allocated by the network device 110. The terminal device 120 sends data on the side link according to the resources allocated by the network device 110; the network device 110 can allocate resources for a single transmission to the terminal device 120, and can also allocate resources for semi-static transmission to the terminal device 120.

[0037] Mode B: If Figure 1B As shown, the terminal device 120 selects at least one resource in the resource pool to transmit data. Specifically, the terminal device 120 can select a transmission resource in the resource pool by listening, or select a transmission resource in the resource pool by random selection.

[0038] The terminal device 120 can be a terminal device in D2D (Device to Device) or a vehicle terminal in the Internet of Vehicles.

[0039] Optionally, the wireless communication system 100 may include multiple network devices and each network device may include other number of user equipments within its coverage area, which is not limited in the embodiments of the present application.

[0040] The network device 110 can provide communication coverage for a specific geographical area, and can communicate with user equipment (such as UE) located in the coverage area. Optionally, the network device 110 can be a base station (Base Transceiver Station, BTS) in a GSM system or a CDMA system, or a base station (NodeB, NB) in a WCDMA system, or an evolved base station (Evolutional Node B, eNB or eNodeB) in an LTE system, or a wireless controller in a cloud radio access network (Cloud Radio Access Network, CRAN), or the network device can be a relay station, an access point, a vehicle-mounted device, a wearable device, a network-side device in a 5G network, or a network device in a future evolved public land mobile network (Public Land Mobile Network, PLMN), etc.

[0041] The terminal device 120 may be mobile or fixed. Optionally, the terminal device 120 may refer to an access terminal, a user equipment (UE), a user unit, a user station, a mobile station, a mobile station, a remote station, a remote terminal, a mobile device, a user device, a terminal, a wireless communication device, a user agent or a user device. The access terminal may be a cellular phone, a cordless phone, a Session Initiation Protocol (SIP) phone, a Wireless Local Loop (WLL) station, a Personal Digital Assistant (PDA), a handheld device with wireless communication function, a computing device or other processing device connected to a wireless modem, a vehicle-mounted device, a wearable device, a user device in a 5G network, or a user device in a future evolved PLMN, etc.

[0042] The following implementation methods of the present application will elaborate on how to avoid terminal devices from forming hidden terminals with each other during sidelink transmission to improve communication reliability.

[0043] Implementation Method 1

[0044] Please see Figure 3 , is a method for sharing channel occupancy time provided in the first embodiment of the present application. The method comprises:

[0045] S210, the first terminal device sends resource indication information for indicating transmission resources;

[0046] S220, the second terminal device receives the resource indication information sent by the first terminal device, and determines the transmission resource indicated by the first terminal device according to the resource indication information;

[0047] S230, the second terminal device performs listen-before-talk LBT according to the transmission resource, and if the LBT is successful, obtains the channel occupancy time COT (Channel Occupancy Time), and shares the COT with the first terminal device;

[0048] S240, the first terminal device performs channel access according to the COT shared by the second terminal device.

[0049] Please continue to see Figure 2 , which is an application scenario of the first implementation mode of this application. Figure 2 In the sidelink transmission shown, the first terminal device UE1 communicates with the second terminal device UE2, and UE1 sends information or data to UE2; the third terminal device UE3 communicates with the fourth terminal device UE4, and UE3 sends information or data to UE4. UE1 and UE3 are far apart, and they cannot sense each other occupying the channel during the LBT process.

[0050] If UE1 and UE3 perform LBT respectively and monitor that both are idle, they will successfully access the channel. However, when UE 1 and UE 3 access the channel at the same time and transmit, the transmission of UE 3 will interfere with the transmission from UE 1 to UE 2, resulting in reduced communication reliability.

[0051] In the first embodiment of the present application, in order to solve this technical problem, UE2 performs LBT monitoring. Since UE2 and UE3 are close to each other, they can know that the other party is occupying the channel, so there will be no mutual concealment. Therefore, the technical problem that UE1 and UE3 are mutually concealed terminals is solved, and the technical effect of improving communication reliability is achieved. Optionally, the LBT is type 1 LBT.

[0052] Optionally, S210, the first terminal device sends resource indication information for indicating transmission resources, including: the first terminal device indicates the transmission resources through sidelink control information SCI. That is, the indicated transmission resources include: the transmission resources indicated by the first terminal device through sidelink control information SCI (Sidelink Control Information).

[0053] Optionally, the indicated transmission resources include: the transmission resources for the same data transmission block TB indicated by the first terminal device through the SCI; and / or, the transmission resources for different TBs (TransportBlocks) indicated by the first terminal device through the SCI.

[0054] Optionally, the SCI includes a first SCI or a second SCI; wherein the first SCI is carried in a physical sidelink control channel PSCCH; and the second SCI information is carried in a physical sidelink shared channel PSSCH.

[0055] Optionally, the transmission resources indicated by the first terminal device are time-frequency resources.

[0056] There are two types of LBT mechanisms:

[0057] Type 1:

[0058] The communication device first monitors the channel within the time period of Td. After all the monitoring time slots within the time period are idle, and N in the following steps is equal to 0, the LBT is successful and the communication device can occupy the channel to send data. Otherwise, the communication device cannot access the channel or continue to try to access the channel.

[0059] Step 1: Set N = Ninit, where Ninit is a random value from 0 to CWp, and jump to step 4;

[0060] Step 2: If N>0, the communication device subtracts 1 from N, i.e. sets N=N-1;

[0061] Step 3: Continue to monitor the channel for a monitoring time slot. If it is idle, jump to step 4, otherwise jump to step 5;

[0062] Step 4: If N=0, stop. Otherwise, jump to step 2;

[0063] Step 5: Continue to monitor the channel until a monitoring time slot is monitored to be busy within the time period of duration Td, or all monitoring time slots within the time period of Td are monitored to be idle.

[0064] Step 6: If all monitoring time slots are idle within the time period of duration Td, jump to step 4; otherwise, jump to step 5.

[0065] The above steps are executed sequentially if no jump is indicated. For example, the above one monitoring time slot is recorded as Tsl, and Tsl is 9 microseconds.

[0066] Ninit is a random value from 0 to CWp. CWp is related to the priority of the communication device to access the channel. CWp can also be called the contention window corresponding to a specific priority or the contention window determined according to the priority. The communication device determines the values ​​of CWmin,p, CWmax,p and the allowed CWp according to the priority of the access channel, that is, the minimum value, maximum value and possible value of the contention window are determined according to the priority. For example, in Table 1, when the priority of the communication device to access the channel is 3, the minimum value, maximum value and possible value of the contention window used are 15, 1023 and {15, 31, 63, 127, 255, 511, 1023}. In fact, the communication device maintains the size of the corresponding contention window for each priority, and adjusts the contention window corresponding to each priority according to certain rules before executing the above step 1 each time, and then determines the contention window used when executing LBT this time according to the priority of channel access, thereby determining Ninit.

[0067] For example, the communication device maintains CW1, CW2, CW3, and CW4. When the communication device executes type 1 LBT, before executing the above step 1, the communication device increases CW1, CW2, CW3, and CW4 to the next larger allowed value. If the priority of the communication device to access the channel this time is 1, the communication device uses the adjusted CW1 to execute this type 1 LBT.

[0068] Table 1

[0069]

[0070]

[0071] The above Td=Tf+mp*Tsl, Tf is equal to 16 microseconds, and mp is related to the priority of channel access. For example, the corresponding mp can be determined from Table 1 according to the priority.

[0072] After the communication device executes the above steps and LBT is successful, if the communication device does not access the channel immediately, when it needs to access the channel to send data, it does not need to perform all the above type 1 LBT processes again. It only needs to monitor the channel occupancy within Td + at least one Tsl time period. If it is idle, it can directly access the channel to send signals.

[0073] When the communication device successfully completes LBT and accesses the channel, the time it occupies the channel is called COT (Channel Occupancy Time). Within COT, the communication device can transmit continuously or discontinuously, but the total transmission time does not exceed Tmcot,p. Tmcot,p is related to the priority of channel access, which can be found in Table 1.

[0074] Type 2:

[0075] Different from type 1, type 2 LBT only requires the communication device to monitor a fixed-length channel. If the monitoring time slot is idle within the fixed length, the communication device can directly access the channel. Specifically, type 2 is divided into three subtypes: 2A, 2B, and 2C:

[0076] Type 2A: The communication device can monitor a channel of 25 microseconds in length (denoted as Tshort). If all the monitoring time slots within Tshort are idle, the communication device can directly access the channel.

[0077] Type 2B: The communication device can monitor the channel of 16 microseconds (denoted as Tf). If the monitoring time slot within Tf is idle, the communication device can directly access the channel.

[0078] Type 2C: The communication device can directly access the channel without LBT. This type can only be applied when the interval between the current transmission and the previous transmission is less than or equal to 16 microseconds. At the same time, the length of this transmission does not exceed 584 microseconds. For example: The above criterion for judging whether the monitoring time slot is busy is that there are 4us of 9us. Otherwise, the monitoring time slot is judged to be idle. Alternatively, the above criterion for judging busy is that the monitored energy or power is greater than or equal to a certain threshold.

[0079] Optionally, in an embodiment of the present application, when the second terminal device succeeds in LBT, if it does not access the channel immediately, when it accesses the channel, it only needs to monitor the channel occupancy within Td + at least one Tsl time period. If it is idle, it can directly access the channel and share COT with the first terminal device.

[0080] Optionally, S230, the second terminal device performs listen-before-talk LBT according to the transmission resource, and if the LBT is successful, obtains a channel occupancy time COT, and shares the COT with the first terminal device, including:

[0081] If the LBT of the second terminal device is successful, the second terminal device shares the COT with the first terminal device via the physical sideline control channel PSCCH, the physical sideline shared channel PSSCH, or the physical sideline feedback channel PSFCH.

[0082] After LBT is successful, the communication device can also share the obtained COT with other communication devices. The channel access type applied in different COT sharing scenarios is also different. Figure 4, which takes the COT sharing on the base station side as an example. The base station shares its COT with the terminal device. An uplink transmission opportunity occurs within the COT obtained by the base station. If the gap between the starting position of the uplink transmission opportunity and the ending position of the downlink transmission opportunity is less than or equal to 16μs, the terminal device can perform Type2C channel access before the uplink transmission; if the gap between the starting position of the uplink transmission opportunity and the ending position of the downlink transmission opportunity is equal to 16μs, the terminal device UE can perform Type2B channel access before the uplink transmission; if the gap between the starting position of the uplink transmission opportunity and the ending position of the downlink transmission opportunity is equal to 25μs or greater than 25μs, the UE can perform Type2A channel access before the uplink transmission. In addition, the COT obtained by the base station may include multiple uplink and downlink conversion points. After the base station shares the COT it has obtained with the UE for uplink transmission, the base station can also use Type2 channel access method, such as Type2A channel access method, to perform channel monitoring within the COT, and restart downlink transmission after the channel monitoring is successful.

[0083] Optionally, in S230, the second terminal device, while instructing the first terminal device to share the COT, further performs at least one of the following:

[0084] Reporting the measurement result to the first terminal device; the measurement result includes but is not limited to: at least one of SL-RSRP (Sidelink Reference Signal Received Power) and CSI (Channel State Information);

[0085] Indicating the type of the LBT to the first terminal device; for example, the type is Type 2A, Type 2B or Type 2C;

[0086] Indicating the duration of the remaining channel occupation time COT to the first terminal device;

[0087] The channel access priority is indicated to the first terminal device.

[0088] Optionally, the second terminal device is a receiving end of the first terminal device, or the second terminal device is a group head terminal device. For example, the group head terminal is a terminal that is scheduled in a group of terminals.

[0089] Optionally, the second terminal device performs LBT according to the indicated transmission resources, including: the second terminal device performs LBT according to at least one of the indicated transmission resources.

[0090] For example: the second terminal device performs LBT according to the transmission resources corresponding to the next transmission indicated by the first terminal device; or, the second terminal device performs LBT according to the transmission resources for the same TB indicated by the first terminal device, wherein the transmission resources for the same TB do not include the transmission resources used for indication.

[0091] Optionally, the second terminal device performs LBT according to the indicated transmission resource also includes: the second terminal device performs LBT on the resource block set (RB set) where the indicated transmission resource is located; and / or, the second terminal device performs LBT before the time slot where the indicated transmission resource is located.

[0092] For example, LBT starts R time slots before the time slot in which the indicated transmission resource is located; R can be determined by any of the following methods: network configuration, pre-configuration, depending on the terminal device implementation, a preset value specified by the standard, or setting R to 1. RB Set means that in an unlicensed spectrum system, the frequency domain resources on the carrier are divided into several resource block sets, and a protection band is configured between the resource block sets. For example, one RB set corresponds to a frequency domain width of 20MHz. The granularity of LBT performed by the communication device is one RB set, so one RB set can also be called an LBT subband. That is, if the communication device wants to send data on a certain RB set, it needs to perform LBT on the RB set, and transmit after LBT is successful.

[0093] For another example, the second terminal determines the transmission resources of the shared COT according to the indicated transmission resources, and performs LBT before the transmission resources of the shared COT.

[0094] Optionally, the second terminal may transmit sharing indication information via PSCCH, PSSCH or PSFCH, and the sharing indication information is used to indicate COT sharing. For example, the second terminal may transmit the sharing indication information via a physical sidelink control channel PSCCH (Physical Sidelink Control Channel), a physical sidelink shared channel PSSCH (Physical Sidelink Shared Channel), or a physical sidelink feedback channel PSFCH (Physical Sidelink Feedback Channel).

[0095] Optionally, the PSCCH or the PSSCH or the PSFCH satisfies one of the following conditions:

[0096] The PSCCH or PSSCH is a PSCCH or PSSCH in a time slot before the indicated transmission resource or in a time slot before the indicated transmission resource; or, the PSFCH is a PSFCH in a time slot before the indicated transmission resource with a PSFCH configured, or in a time slot before the indicated transmission resource with a PSFCH configured; and / or,

[0097] The PSCCH or the PSSCH or the PSFCH and the indicated transmission resource are located in the same resource block set RB Set.

[0098] Optionally, the resource pool is a resource pool of the first terminal device or a resource pool of the second terminal device. Exemplarily, the resource pool is a resource pool of the first terminal device or a resource pool of the second terminal device. The resource pool may be a sending resource pool or a receiving resource pool.

[0099] Optionally, S240, the first terminal device performs channel access according to the COT shared by the second terminal device, including:

[0100] If the first terminal device receives the sharing indication information of the shared COT of the second terminal device, the first terminal device uses the second type of LBT for channel access; and / or,

[0101] If the first terminal device does not receive the sharing indication information of the shared COT from the second terminal device, it uses the first type of LBT to access the channel, or does not perform LBT.

[0102] Optionally, S240, the first terminal device performs channel access according to the COT shared by the second terminal device, including:

[0103] The first terminal device determines to use the first type of LBT for channel access, or to use the second type of LBT for channel access, or not to perform LBT, based on the sharing indication information of the shared COT of the second terminal device.

[0104] Please see Figure 5 , which is a specific example of an implementation method of the present application. Among them, side link transmission is performed between the first terminal device UE1 and the second terminal device UE2. UE1 sends side control information SCI to UE2, and transmits data to UE2. UE2 shares COT with UE1. In the figure, the horizontal axis t is the time domain, and the vertical axis f is the frequency domain. This example includes two resource block sets RB Set 1 and RBSet 2. Both RB Set1 and RB Set2 include PSFCH 710, PSSCH720, and PSCCH730. Among them, UE 2 is the receiving end of UE 1, or UE 2 is the group head terminal.

[0105] UE 1 sends PSCCH and PSSCH in time slot n, and uses the first side control information SCI in PSCCH to indicate the time-frequency resources of time slots n, n+b and n+c. The above three resources are used for the transmission of the same TB. The PSCCH and PSSCH resources in the figure are interlaces to meet the requirements of unlicensed spectrum band occupancy. UE 2 determines the time-frequency resources indicated by UE 1 according to the first SCI and performs LBT. UE 2 can perform LBT only based on the resources in time slot n+b, or UE 2 can also perform LBT based on the resources in time slot n+b and time slot n+c.

[0106] If UE 2 performs LBT based on the resources in time slot n+b, UE 2 may perform type 1 LBT in time slot n+bR, where R is configured or preconfigured by the network. Alternatively, if UE 2 determines the time-frequency resources indicating COT sharing, that is, determines that PSFCH or PSCCH or PSSCH in time slot n+b-1 transmits indication information, which is used to indicate COT, UE 2 performs type 1 LBT before time slot n+b-1. UE 2 performs the above LBT on RB set 2.

[0107] When UE2 LBT succeeds, UE 2 indicates the shared COT on the PSFCH, PSCCH or PSSCH of RB set 2. Assume that UE2 uses PSFCH to indicate the shared COT. Figure 5 In this example, n+b-1 is the last time slot with PSFCH resources configured before time slot n+b, so UE 2 indicates shared COT in PSFCH resources in time slot n+b-1. Assume that UE2 indicates shared COT using PSCCH or PSSCH. Figure 5 In the example, n+b-1 is a time slot belonging to the resource pool, so UE 2 indicates COT sharing in the PSSCH or PSCCH in time slot n+b-1.

[0108] When UE2 uses PSFCH to indicate shared COT, the PSFCH resource carries a bit of indication information. When UE 1 receives the indication information, Type 2LBT is used for channel access. When UE 1 does not receive the indication information, UE 1 accesses the channel according to Type 1LBT or does not perform LBT. Alternatively, if the indication information is a first value, Type 2LBT is used for channel access. If the indication information is a second value, Type 1LBT is used to access the channel or does not perform LBT. Optionally, in this case, the specific type of channel access using Type 2LBT by UE 1 is implemented by UE 1 or configured or pre-configured by the network.

[0109] If UE2 uses PSCCH or PSSCH to indicate shared COT, the PSCCH or PSSCH resources carry shared indication information, and the shared indication information includes one or more of the remaining COT duration, channel access priority, and channel access type (for example: Type2A / 2B / 2C). When UE 1 receives the shared indication information, Type 2 channel access is performed. Optionally, when the channel access priority of UE 1 is higher than the channel access priority in the shared indication information, Type 2 access channel is used. Otherwise, LBT is not performed or Type 1 LBT access is performed. Optionally, UE 1 determines whether to use Type 2 LBT to access the channel or use Type 1 LBT to access or not perform LBT based on the remaining COT duration. When UE 1 does not receive the shared indication information, LBT is not performed or Type 1 LBT access is performed. When using PSSCH resources, UE 2 can also carry SL-RSRP or CSI measurement results in PSSCH. Optionally, the type of Type 2 LBT access used by the above UE 1 can be determined according to the channel access type in the shared indication information.

[0110] If UE 2 performs LBT based on the resources in time slot n+c, UE 2 can perform type 1 LBT in time slot n+cR, where R is configured or preconfigured by the network. Alternatively, UE 2 determines the time-frequency resources indicating COT sharing, that is, determines that PSFCH or PSCCH or PSSCH in time slot n+c-1 transmits indication information, then UE 2 performs type 1 LBT before time slot n+c-1. UE 2 performs LBT on RBset 1.

[0111] When UE2 LBT succeeds, UE 2 indicates shared COT on PSFCH, PSCCH or PSSCH resources of RB set 1. Assume that UE2 uses PSFCH to indicate shared COT. Figure 5 Where n+c-1 is the last time slot with PSFCH resources configured before time slot n+c, so UE 2 indicates shared COT in the PSFCH resources in time slot n+c-1. Assume that UE2 uses PSCCH or PSSCH to indicate shared COT, and n+c-1 is a time slot belonging to the resource pool, so UE 2 indicates COT sharing in the PSSCH or PSCCH in time slot n+c-1.

[0112] When UE2 uses PSFCH to indicate shared COT, the PSFCH resource carries a one-bit indication information. When UE 1 receives the indication information, Type 2LBT is used for channel access. When UE 1 does not receive the indication information, UE 1 accesses the channel according to Type 1LBT or does not perform LBT. Or if the indication information is a first value, Type 2LBT is used for channel access. If the indication information is a second value, Type 1LBT is used to access the channel or does not perform LBT. Optionally, in this case, the specific type of Type 2LBT used by UE1 for channel access is implemented by UE 1 or configured or pre-configured by the network.

[0113] Specifically, when using PSCCH resources or PSSCH resources, the PSCCH or PSSCH resources carry shared indication information, and the shared indication information includes one or more of the remaining COT duration, channel access priority and channel access type (egType2A / 2B / 2C). When UE 1 receives the shared indication information, Type 2 channel access is performed. Optionally, when the channel access priority of UE 1 is higher than the channel access priority in the shared indication information, Type 2 access channel is used. Otherwise, LBT is not performed or Type 1 LBT access is performed. Optionally, UE 1 determines whether to use Type 2 LBT access channel or Type 1 LBT access or not LBT based on the remaining COT duration. When UE 1 does not receive the shared indication information, LBT is not performed or Type 1 LBT access is performed. When using PSSCH resources, UE 2 can also carry SL-RSRP or CSI measurement results in PSSCH. Optionally, the type of Type 2 LBT access used by the above UE 1 can be determined according to the channel access type in the shared indication information.

[0114] In the first embodiment of the present application, after the LBT is successful by the receiving terminal or the group head terminal (i.e., UE2), the COT is shared with the sending terminal (i.e., UE1). UE 1 uses the shared COT to access the channel. Since UE 2 can sense whether the nearby UE 3 occupies the channel, UE 2 can only successfully LBT when UE 3 is not occupying the channel, and then transmit the COT to UE 1. Therefore, the COT obtained by UE1 in this case will not conflict with that of UE3, and the communication process between UE1 and UE2 will not be interfered by UE3. Therefore, the technical problem of UE1 and UE3 being mutually hidden terminals in the prior art is solved, thereby improving the reliability of communication.

[0115] Implementation Method 2

[0116] Please see Figure 6, is a terminal device 300 provided in the second embodiment of the present application, used for sharing channel occupation time. Figure 2 The second terminal device UE2 in the embodiment, that is, UE2 may be a receiving terminal of the first terminal device UE1, or a group head terminal. The terminal device 300 includes:

[0117] The resource determination unit 310 is used to receive the resource indication information sent by the first terminal device, and determine the transmission resource indicated by the first terminal device according to the resource indication information;

[0118] A monitoring unit 320, configured to perform listen-before-talk LBT according to the indicated transmission resource;

[0119] The sharing unit 330 is configured to share the channel occupation time COT with the first terminal device if the monitoring unit LBT succeeds.

[0120] Optionally, the indicated transmission resources include: the transmission resources indicated by the first terminal device through side control information SCI.

[0121] Optionally, the indicated transmission resources include: transmission resources for the same data transmission block TB indicated by the first terminal device through the SCI; or transmission resources for different TBs indicated by the first terminal device through the SCI.

[0122] Optionally, the SCI includes a first SCI or a second SCI; wherein the first SCI is carried in a physical sidelink control channel PSCCH; and the second SCI information is carried in a physical sidelink shared channel PSSCH.

[0123] Optionally, the monitoring unit 320 is specifically used to perform LBT according to at least one of the indicated transmission resources.

[0124] Optionally, the monitoring unit 320 is more specifically used to perform LBT according to the transmission resources corresponding to the next transmission indicated by the first terminal device; or, to perform LBT according to the transmission resources for the same TB indicated by the first terminal device, wherein the transmission resources for the same TB do not include the transmission resources used for indication.

[0125] Optionally, the monitoring unit 320 is further used to perform LBT on the resource block set RB set where the indicated transmission resource is located; or, to perform LBT before the time slot where the indicated transmission resource is located; or, to perform LBT before the transmission resource of the shared COT determined by the second terminal device based on the indicated transmission resource.

[0126] Optionally, the sharing unit 330 is specifically configured to share the COT with the first terminal device via a physical sidelink control channel PSCCH, a physical sidelink shared channel PSSCH, or a physical sidelink feedback channel PSFCH if the sharing unit LBT is successful.

[0127] Optionally, the PSCCH or the PSSCH or the PSFCH satisfies one of the following conditions:

[0128] The PSCCH or PSSCH is a PSCCH or PSSCH in a previous time slot of the indicated transmission resource or in a previous time slot belonging to a resource pool; or,

[0129] The PSFCH is a PSFCH in the last time slot in which the PSFCH is configured before the indicated transmission resource, or a PSFCH in the last time slot in which the PSFCH is configured belonging to the resource pool; or,

[0130] The PSCCH or the PSSCH or the PSFCH and the indicated transmission resource are located in the same resource block set RB Set.

[0131] Optionally, the sharing unit 330 is further configured to process at least one of the following items while indicating the sharing of the COT to the first terminal device UE1:

[0132] Reporting the measurement result to the first terminal device;

[0133] Indicating the type of the LBT to the first terminal device;

[0134] Indicating the duration of the remaining channel occupation time COT to the first terminal device;

[0135] The channel access priority is indicated to the first terminal device.

[0136] For any incomplete details in the second embodiment, please refer to the same or corresponding parts in the first embodiment above, and no repetition will be made here.

[0137] Implementation Method 3

[0138] Please see Figure 7 , a terminal device 400 provided in the third embodiment of the present invention is used to receive the shared channel occupation time. Figure 2 The first terminal device UE1 in the embodiment. The terminal device 400 includes:

[0139] The sending unit 410 is used to send resource indication information, where the resource indication information is used to indicate transmission resources;

[0140] An acquiring unit 420 is configured to acquire a channel occupation time COT shared by the second terminal device, where the channel occupation time is shared with the sending unit after the second terminal device successfully performs listen-before-talk LBT according to the transmission resource indicated by the resource indication information;

[0141] The access unit 430 is configured to perform channel access according to the COT shared by the second terminal device.

[0142] Optionally, the sending unit 410 is specifically configured to indicate the transmission resource through sidelink control information SCI.

[0143] Optionally, the sending unit 410 is more specifically configured to indicate transmission resources for the same data transmission block TB through the SCI; or, to indicate transmission resources for different TBs through the SCI.

[0144] Optionally, the SCI includes a first SCI or a second SCI; wherein the first SCI is carried in a physical sidelink control channel PSCCH; and the second SCI information is carried in a physical sidelink shared channel PSSCH.

[0145] Optionally, the access unit 430 is specifically used to: if sharing indication information of the shared COT of the second terminal device is received, use the second type of LBT for channel access; and / or, if sharing indication information of the shared COT of the second terminal device is not received, use the first type of LBT for channel access, or do not perform LBT.

[0146] Optionally, the access unit 430 is specifically used to determine whether to use the first type of LBT for channel access, or to use the second type of LBT for channel access, or not to perform LBT, based on the sharing indication information of the shared COT of the second terminal device.

[0147] For any incomplete details in the third embodiment, please refer to the same or corresponding parts in the first or second embodiment above, and no repetition will be made here.

[0148] Implementation Method 4

[0149] Please see Figure 8 , a schematic diagram of the structure of a terminal device provided by Embodiment 4 of the present invention. The terminal device includes: a processor 510, a memory 520 and a network interface 530. The processor 510 and the memory 520 are connected to each other through a bus system.

[0150] The memory 520 is a computer-readable storage medium, which stores a program that can be run on the processor 510. The processor 510 calls the program in the memory 520, executes the corresponding process implemented by the first terminal device in the method for sharing the channel occupation time provided in the above embodiment 1, or executes the corresponding process implemented by the second terminal device in the method for sharing the channel occupation time provided in the above embodiment 1, and sends the processing result through the network interface 530.

[0151] The processor 510 may be an independent component or a collective term for multiple processing elements, for example, a CPU, an ASIC, or one or more integrated circuits configured to implement the above method, such as at least one microprocessor DSP, or at least one programmable gate array FPGA, etc.

[0152] Those skilled in the art should be aware that in one or more of the above examples, the functions described in the specific embodiments of the present application can be implemented in whole or in part by software, hardware, firmware or any combination thereof. When implemented using software, it can be implemented by a processor executing software instructions. Software instructions can be composed of corresponding software modules. The software module can be stored in a computer-readable storage medium, which can be any available medium that a computer can access or a data storage device such as a server or data center that includes one or more available media integrations. The available medium can be a magnetic medium (e.g., a floppy disk, a hard disk, a magnetic tape), an optical medium (e.g., a digital video disc (Digital Video Disc, DVD)), or a semiconductor medium (e.g., a solid-state drive (Solid State Disk, SSD)), etc. The computer-readable storage medium includes, but is not limited to, random access memory (RAM), flash memory, read-only memory (ROM), erasable programmable read-only memory (EPROM), electrically erasable programmable read-only memory (EEPROM), registers, hard disks, mobile hard disks, read-only compact disks (CD-ROMs), or any other form of storage medium known in the art. An exemplary computer-readable storage medium is coupled to a processor so that the processor can read information from the computer-readable storage medium and write information to the computer-readable storage medium. Of course, the computer-readable storage medium can also be a component of the processor. The processor and the computer-readable storage medium can be located in an ASIC. In addition, the ASIC can be located in an access network device, a target network device, or a core network device. Of course, the processor and the computer-readable storage medium can also exist as discrete components in an access network device, a target network device, or a core network device. When implemented using software, it can also be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on a computer or chip, the processes or functions described in the specific implementation of the present application are generated in whole or in part. The computer may be a general-purpose computer, a special-purpose computer, a computer network, or other programmable device.The computer program instructions may be stored in the above-mentioned computer-readable storage medium, or transmitted from one computer-readable storage medium to another computer-readable storage medium. For example, the computer instructions may be transmitted from one website site, computer, server or data center to another website site, computer, server or data center via wired (e.g., coaxial cable, optical fiber, digital subscriber line (DSL)) or wireless (e.g., infrared, wireless, microwave, etc.) means.

[0153] The above embodiments illustrate but do not limit the present invention, and those skilled in the art can design multiple alternative examples within the scope of the claims. Those skilled in the art should be aware that the present application is not limited to the precise structure described above and shown in the drawings, and that appropriate adjustments, modifications, equivalent substitutions, improvements, etc. can be made to the specific implementation schemes without violating the scope of the present invention as defined in the attached claims. Therefore, any modifications and changes made according to the concept and principle of the present invention are within the scope of the present invention as defined in the attached claims.

Claims

1. A method for sharing channel occupancy time, characterized in that: The method includes The second terminal device receives the resource indication information sent by the first terminal device, and determines the transmission resource indicated by the first terminal device according to the resource indication information; The second terminal device performs listen-before-talk LBT according to the indicated transmission resources; If the LBT of the second terminal device is successful, the channel occupation time COT is shared with the first terminal device.

2. The method according to claim 1, characterized in that The indicated transmission resources include: the transmission resources indicated by the first terminal device through side control information SCI.

3. The method according to claim 2, characterized in that The indicated transmission resources include: The first terminal device indicates the transmission resources for the same data transmission block TB through the SCI; or, The first terminal device indicates the transmission resources for different TBs through the SCI.

4. The method according to any one of claims 1 to 3, characterized in that The SCI includes a first SCI; wherein the first SCI is carried in a physical sidelink control channel PSCCH.

5. The method according to any one of claims 1 to 4, characterized in that The second terminal device performing LBT according to the indicated transmission resource includes: The second terminal device performs LBT according to at least one of the indicated transmission resources.

6. The method according to any one of claims 1 to 5, characterized in that The second terminal device performing LBT according to the indicated transmission resource further includes: The second terminal device performs LBT on the resource block set RB set where the indicated transmission resource is located; or, The second terminal device performs LBT before the time slot in which the indicated transmission resource is located; or, The second terminal device determines the transmission resources of the shared COT based on the indicated transmission resources, and performs LBT before the transmission resources of the shared COT.

7. The method according to any one of claims 1 to 6, characterized in that If the LBT of the second terminal device is successful, the channel occupation time COT is shared with the first terminal device, including: If the LBT of the second terminal device is successful, the second terminal device shares the COT with the first terminal device via the physical sidelink control channel PSCCH or the physical sidelink shared channel PSSCH.

8. The method according to claim 7, characterized in that The PSCCH or the PSSCH satisfies the following conditions: The PSCCH or the PSSCH and the indicated transmission resource are located in the same resource block set RB Set.

9. The method according to any one of claims 1 to 8, characterized in that The second terminal device, while indicating to the first terminal device to share the COT, further performs at least one of the following: Indicating the duration of the remaining channel occupation time COT to the first terminal device; Indicate the channel access priority to the first terminal device.

10. The method according to any one of claims 1 to 9, characterized in that The second terminal device is a receiving end of the first terminal device.

11. A method for sharing channel occupancy time, characterized in that: The method includes The first terminal device sends resource indication information for indicating transmission resources; The first terminal device obtains a channel occupation time COT shared by the second terminal device, where the channel occupation time is shared with the first terminal device after the second terminal device successfully performs listen-before-talk LBT according to the transmission resources indicated by the resource indication information; The first terminal device performs channel access according to the COT shared by the second terminal device.

12. The method according to claim 11, characterized in that The first terminal device sending resource indication information for indicating transmission resources includes: the first terminal device indicating the transmission resources through side control information SCI.

13. The method according to claim 12, characterized in that The transmission resources indicated by the resource indication information include: The first terminal device indicates the transmission resources for the same data transmission block TB through the SCI; or, The first terminal device indicates the transmission resources for different TBs through the SCI.

14. The method according to any one of claims 12 or 13, characterized in that The SCI includes a first SCI; wherein the first SCI is carried in a physical sidelink control channel PSCCH.

15. The method according to any one of claims 11 to 14, characterized in that The first terminal device performs channel access according to the COT shared by the second terminal device, including: If the first terminal device receives the sharing indication information of the shared COT of the second terminal device, the first terminal device uses the second type of LBT for channel access; and / or, If the first terminal device does not receive the sharing indication information of the shared COT from the second terminal device, it uses the first type of LBT to access the channel, or does not perform LBT.

16. The method according to any one of claims 11 to 14, characterized in that The first terminal device performs channel access according to the COT shared by the second terminal device, including: The first terminal device determines to use the first type of LBT for channel access, or to use the second type of LBT for channel access, or not to perform LBT, based on the sharing indication information of the shared COT of the second terminal device.

17. A terminal device, characterized in that: The terminal device is used to share the channel occupation time; the terminal device includes: A resource determination unit, configured to receive resource indication information sent by the first terminal device, and determine the transmission resource indicated by the first terminal device according to the resource indication information; A monitoring unit, configured to perform listen-before-talk LBT according to the indicated transmission resources; A sharing unit is used to share the channel occupation time COT with the first terminal device if the monitoring unit LBT is successful.

18. A terminal device, characterized in that: The terminal device is used to receive the shared channel occupation time; the terminal device includes: A sending unit, used to send resource indication information, where the resource indication information is used to indicate transmission resources; an acquiring unit, configured to acquire a channel occupation time COT shared by the second terminal device, wherein the channel occupation time is shared with the sending unit after the second terminal device successfully performs listen-before-talk LBT according to the transmission resource indicated by the resource indication information; An access unit is used to perform channel access according to the COT shared by the second terminal device.

19. A terminal device for sharing channel occupancy time, characterized in that: The device includes: a processor, a memory and a network interface; the processor calls the program in the memory to execute the method for sharing channel occupancy time described in any one of the above specific claims 1 to 16, and sends the execution result through the network interface.

20. A chip, characterized in that: include: The processor is used to call and run a computer program from a memory, and a device equipped with the chip executes the method for sharing channel occupancy time as described in any one of claims 1 to 16.

21. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores a program for an uplink transmission method, and when the program for the uplink transmission method is executed by a processor, the method for sharing channel occupancy time as described in any one of claims 1 to 16 is implemented.

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