Method and device for determining contention window, equipment and storage medium

Abstract

The invention discloses a method, device and equipment for determining a contention window and a storage medium, and relates to the technical field of communication. The method comprises: if the transmission of the terminal device comprises NACK-Only-based transmission and / or blind retransmission, determining the latest contention window for the first transmission as the contention window used by the transmission of the terminal device (710). In the sidewalk communication, the latest contention window used for the first transmission is determined as the contention window used by the sidewalk transmission of the terminal equipment, and a method for determining the contention window is designed for two transmission modes of NACK-Only and blind retransmission, so that the same contention window is prevented from being used during LBT of multiple terminal equipment, and the mutual interference among the terminal equipment is reduced.

Description

Method, device, equipment and storage medium for determining contention window Technical Field

[0001] The embodiments of the present application relate to the field of communication technologies, and in particular to a method, apparatus, device, and storage medium for determining a contention window. Background Art

[0002] When the SL (Sidelink) operates in unlicensed spectrum, the terminal device needs to determine the contention window when performing Type 1 LBT (Listen Before Talk). However, how the terminal device determines the contention window requires further research.

[0003] Summary of the Invention

[0004] The present invention provides a method, apparatus, device, and storage medium for determining a contention window. The technical solution is as follows:

[0005] According to one aspect of an embodiment of the present application, a method for determining a contention window is provided, the method being performed by a terminal device, the method comprising:

[0006] If the transmission of the terminal device includes NACK-Only (Negative Acknowledgement-Only) based transmission and / or blind retransmission, the latest contention window used for the first transmission is determined as the contention window used for the transmission of the terminal device.

[0007] According to one aspect of an embodiment of the present application, a device for determining a contention window is provided, the device including:

[0008] The processing module is configured to determine, if the transmission of the terminal device includes NACK-Only-based transmission and / or blind retransmission, the latest contention window used for the first transmission as the contention window used for the transmission of the terminal device.

[0009] According to one aspect of an embodiment of the present application, a terminal device is provided, comprising a processor and a memory, wherein a computer program is stored in the memory, and the processor executes the computer program to implement the above-mentioned method for determining a contention window.

[0010] According to one aspect of an embodiment of the present application, a computer-readable storage medium is provided, in which a computer program is stored. The computer program is configured to be executed by a processor to implement the above-mentioned method for determining a contention window.

[0011] According to one aspect of an embodiment of the present application, a chip is provided, which includes a programmable logic circuit and / or program instructions. When the chip is running, it is used to implement the above-mentioned method for determining the contention window.

[0012] According to one aspect of an embodiment of the present application, a computer program product is provided, which includes computer instructions stored in a computer-readable storage medium. A processor reads and executes the computer instructions from the computer-readable storage medium to implement the above-mentioned method for determining a contention window.

[0013] The technical solutions provided by the embodiments of the present application may have the following beneficial effects:

[0014] In sideline communications, the latest contention window used for the first transmission is determined as the contention window used for the sideline transmission of the terminal device. A method for determining the contention window is designed for the two transmission modes of NACK-Only and blind retransmission, so as to avoid using the same contention window during LBT of multiple terminal devices and reduce mutual interference between terminal devices. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] FIG1 is a schematic diagram of a network architecture provided by an embodiment of the present application;

[0016] FIG2 is a flow chart of a Type 1 LBT provided by one embodiment of the present application;

[0017] FIG3 is a schematic diagram of adjusting a contention window according to an embodiment of the present application;

[0018] FIG4 is a schematic diagram of determining a contention window according to an embodiment of the present application;

[0019] FIG5 is a schematic diagram of mode A and mode B of sideline communication provided by one embodiment of the present application;

[0020] FIG6 is a schematic diagram of the physical layer structure of the NR (New Radio) SL provided in one embodiment of the present application;

[0021] FIG7 is a flowchart of a method for determining a contention window provided by one embodiment of the present application;

[0022] FIG8 is a schematic diagram of transmission and first transmission of a terminal device provided by one embodiment of the present application;

[0023] FIG9 is a flowchart of a method for determining a contention window provided by another embodiment of the present application;

[0024] FIG10 is a block diagram of an apparatus for determining a contention window provided by one embodiment of the present application;

[0025] FIG11 is a schematic structural diagram of a terminal device provided in one embodiment of the present application. DETAILED DESCRIPTION

[0026] In order to make the objectives, technical solutions and advantages of this application clearer, the implementation methods of this application will be further described in detail below with reference to the accompanying drawings.

[0027] The network architecture and business scenarios described in the embodiments of the present application are intended to more clearly illustrate the technical solutions of the embodiments of the present application, and do not constitute a limitation on the technical solutions provided by the embodiments of the present application. A person skilled in the art will appreciate that, with the evolution of the network architecture and the emergence of new business scenarios, the technical solutions provided by the embodiments of the present application are equally applicable to similar technical problems.

[0028] Please refer to Figure 1, which shows a schematic diagram of a network architecture provided by an embodiment of the present application. The network architecture may include: a core network 11, an access network 12, and a terminal device 13.

[0029] The core network 11 includes several core network devices. The functions of the core network devices are mainly to provide user connections, user management, and service carrying, and to provide an interface to the external network as a bearer network. For example, the core network of a 5G (5th Generation, fifth generation mobile communication technology) NR system may include devices such as an AMF (Access and Mobility Management Function) entity, a UPF (User Plane Function) entity, and an SMF (Session Management Function) entity.

[0030] The access network 12 includes several access network devices 14. The access network in the 5G NR system can be called NG-RAN (New Generation-Radio Access Network). The access network device 14 is a device deployed in the access network 12 to provide wireless communication functions for the terminal device 13. The access network device 14 may include various forms of macro base stations, micro base stations, relay stations, access points, etc. In systems using different wireless access technologies, the names of devices with access network device functions may be different. For example, in the 5G NR system, they are called gNodeB or gNB. With the evolution of communication technology, the name of "access network device" may change. For the convenience of description, in the embodiments of the present application, the above-mentioned devices that provide wireless communication functions for the terminal device 13 are collectively referred to as access network devices.

[0031] The number of terminal devices 13 is usually multiple, and one or more terminal devices 13 can be distributed in the cell managed by each access network device 14. The terminal device 13 may include various handheld devices with wireless communication functions, vehicle-mounted devices, wearable devices, computing devices or other processing devices connected to a wireless modem, as well as various forms of user equipment (UE), mobile stations (MS), etc. For the convenience of description, the devices mentioned above are collectively referred to as terminal devices, that is, the terminal devices and UE mentioned in the embodiments of the present application can be understood as having the same meaning. The access network device 14 and the core network device communicate with each other through some air technology, such as the NG interface in the 5G NR system. The access network device 14 and the terminal device 13 communicate with each other through some air technology, such as the Uu interface.

[0032] Terminal devices 13 and terminal devices 13 (for example, vehicle-mounted devices and other devices (such as other vehicle-mounted devices, mobile phones, RSU (Road Side Unit), etc.)) can communicate with each other through a direct communication interface (such as PC5 (ProSe Communication 5, neighbor communication fifth interface) interface). Accordingly, the communication link established based on the direct communication interface can be called a direct link or SL. SL transmission is the direct communication and data transmission between terminal devices through a side link. Unlike traditional cellular systems where communication data is received or sent through access network equipment, SL transmission has the characteristics of short delay and low overhead, and is suitable for communication between two terminal devices that are geographically close (such as vehicle-mounted devices and other peripheral devices that are geographically close). It should be noted that in Figure 1, only vehicle-to-vehicle communication in the V2X (vehicle to everything) scenario is used as an example. SL technology can be applied to scenarios where direct communication is carried out between various terminal devices. In other words, the terminal device in this application refers to any device that communicates using SL technology.

[0033] The "5G NR system" in the embodiments of this application may also be referred to as a 5G system or an NR system, but those skilled in the art will understand its meaning. The technical solutions described in the embodiments of this application can be applied to the 5G NR system and can also be applied to subsequent evolution systems of the 5G NR system.

[0034] Before introducing the technical solutions of this application, we first introduce and explain some of the background technologies involved in this application. The following related technologies can be combined with the technical solutions of the embodiments of this application as optional solutions, and they all fall within the scope of protection of the embodiments of this application. The embodiments of this application include at least some of the following contents.

[0035] 1. Unlicensed Spectrum

[0036] Unlicensed spectrum is a spectrum designated by countries and regions for use by radio equipment. This spectrum is generally considered shared spectrum, meaning that devices in different communication systems can use it as long as they meet national or regional regulations for that spectrum, without having to apply for exclusive spectrum authorization from the government. For example, WiFi (Wireless Fidelity) systems are deployed in unlicensed spectrum.

[0037] First, regulations have some restrictions on the bandwidth that communication devices can use to transmit on unlicensed spectrum. That is, the bandwidth occupied by the communication device's transmission must span at least L% of the total spectrum bandwidth, with L = 80 being the typical regulatory requirement. For example, assuming the total bandwidth is 100 PRBs (Physical Resource Blocks), then when the communication device transmits, the difference between the lowest PRB index and the highest PRB index used must be at least 80. If the communication device needs two PRBs to send data, and PRB 1 is occupied, the index of the other PRB must be at least 81. In some cases, the communication device only needs to meet the requirement that the bandwidth occupied by the transmission is at least 2MHz.

[0038] 2. LBT Mechanism

[0039] In unlicensed spectrum, all communication devices must perform LBT before transmitting. This means that before transmitting on a channel in unlicensed spectrum, a communication device must first monitor the channel. Only when the channel monitoring result indicates that the channel is idle can the communication device transmit.

[0040] The LBT mechanisms include the following:

[0041] 1. Type 1

[0042] The communication device first monitors the channel for a time period of Td. If all monitored time slots within this 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 LBT fails and the communication device cannot access the channel.

[0043] For example, as shown in FIG2 , a flow chart of Type 1 LBT is shown.

[0044] Step 1: Set N = Ninit, Ninit is from 0 to CW p Random value, jump to step 4;

[0045] Step 2: If N>0, the communication device subtracts 1 from N, i.e. sets N=N-1;

[0046] Step 3: Continue to monitor the channel for a monitoring time slot. If the channel is idle, jump to step 4; otherwise, jump to step 5.

[0047] Step 4: If N=0, stop; otherwise jump to step 2;

[0048] Step 5: Continue monitoring the channel until a monitoring time slot is busy within the time period of Td, or all monitoring time slots within the time period of Td are idle.

[0049] 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.

[0050] In the above steps, if no jump is indicated, the steps are executed sequentially. For example, the above one monitoring time slot is denoted as Tsl, which is 9 microseconds.

[0051] Ninit is from 0 to CW p Random value of CW. p Related to the priority of communication equipment accessing the channel. p It can also be called the contention window (CW) corresponding to a specific priority or the contention window determined according to the priority. The communication device determines the CW according to the priority of the access channel. min,p 、CW max,p and allowed CW p The value of , that is, the minimum, maximum, and possible values ​​of the contention window are determined based on the priority. For example, in Table 1, when the communication device's access priority for the channel is 3, the minimum, maximum, and possible values ​​of the contention window used are 15, 1023, and {15, 31, 63, 127, 255, 511, 1023}. In practice, the communication device maintains a corresponding contention window size for each priority level. Before executing step 1 above, the contention window corresponding to each priority level can be adjusted according to certain rules. Then, based on the channel access priority, the contention window used for this LBT execution is determined, thereby determining Ninit.

[0052] For example, the communication device maintains CW1, CW2, CW3, and CW4. When the communication device performs type 1 LBT, before executing step 1 above, the communication device increases CW1, CW2, CW3, and CW4 to the next larger allowed value. If the priority of the communication device accessing the channel this time is 1, the communication device uses the adjusted CW1 to perform type 1 LBT.

[0053] Table 1: Channel access priority and CW p The corresponding relationship

[0054] The above Td=Tf+m p *Tsl, Tf equals 16 microseconds, m p Related to the priority of channel access. For example, the corresponding m can be determined according to the priority from Table 1. p .

[0055] 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 send data to the access channel, it does not need to perform the entire type 1 LBT process again. It only needs to monitor the channel occupancy within the Td + at least one Tsl time period. If it is idle, it can directly access the channel to send signals.

[0056] When a communication device successfully completes LBT and accesses the channel, the time it occupies the channel is called COT (Channel Occupancy Time). During the COT, the communication device can transmit continuously or discontinuously, but the total transmission time does not exceed T mcot,p . T mcot,p It is related to the priority of channel access and can be found in Table 1, for example.

[0057] Type 2

[0058] Unlike Type 1, Type 2 LBT only requires the communication device to monitor the channel for a fixed length. If the monitoring time slot is idle within this fixed length, the communication device can directly access the channel. Specifically, Type 2 is divided into three subtypes: 2A, 2B, and 2C.

[0059] Type 2A: The communication device can monitor a channel with a length of 25 microseconds (denoted as Tshort). If all the monitoring time slots within Tshort are idle, the communication device can directly access the channel.

[0060] Type 2B: The communication device can monitor the channel for 16 microseconds (denoted as Tf). If the monitoring time slot within Tf is idle, the communication device can directly access the channel.

[0061] Type 2C: The communication device can directly access the channel without LBT. This type of transmission can only be used 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 the current transmission does not exceed 584 microseconds.

[0062] 3. Competition Window Adjustment

[0063] FIG3 shows an example of the communication device adjusting the contention window corresponding to each priority level before executing step 1 of Type 1 LBT.

[0064] The communication device maintains a contention window corresponding to each priority level and initializes the contention window corresponding to each priority level to the minimum contention window value allowed for that priority level. For example, the communication device maintains CW1, CW2, CW3, and CW4 corresponding to channel access priorities 1, 2, 3, and 4, respectively, and initializes CW1, CW2, CW3, and CW4 to the minimum contention window values ​​allowed for each priority level in Table 1, 3, 7, 15, and 15.

[0065] Before executing step 1 of the aforementioned Type 1 LBT, the communication device adjusts the contention window corresponding to each priority level. The communication device determines a reference time period. If at least one of the HARQ (Hybrid Automatic Repeat reQuest) feedback values ​​corresponding to one or more PDSCHs (Physical Downlink Shared Channels) transmitted by the communication device during the reference time period is an ACK (Acknowledgement), the contention window corresponding to each priority level is set to the minimum allowed contention window value for each priority level. Otherwise, the communication device increases the contention window corresponding to each priority level to the next allowed value for each priority level. The aforementioned reference time period is generally the starting time period of the communication device's transmission occupying the channel after the most recent successful Type 1 LBT. For example, as shown in Figure 3, the communication device maintains CW1, CW2, CW3, and CW4, and before executing step 1 of a Type 1 LBT, such as LBT 2, CW1, CW2, CW3, and CW4 are adjusted. The communication device last accessed the channel after successfully completing the last Type 1 LBT (LBT 1). Therefore, the communication device determines the HARQ feedback values ​​corresponding to one or more PDSCHs transmitted during the reference time period of the COT. If at least one is an ACK, CW1, CW2, CW3, and CW4 are set to the minimum allowed contention window values ​​for each priority level in Table 1, namely, 3, 7, 15, and 15. Otherwise, CW1, CW2, CW3, and CW4 are increased to the next allowed values. Assuming that CW1, CW2, CW3, and CW4 were 3, 7, 15, and 15 before adjustment, they are increased to 7, 15, 31, and 31 according to Table 1.

[0066] In the above process of maintaining and adjusting the contention window corresponding to each priority, for a contention window CW under a specific priority p, p If CW p If the maximum contention window for priority p is already the maximum value, then increase CW p To the next allowed value, it is still the maximum value of the contention window corresponding to priority p. pIf the maximum value of the contention window corresponding to priority p has been equal to k times in a row and is used to generate Ninit, then CW p Set to the minimum value of the contention window corresponding to priority p.

[0067] In addition, if the transmission of the communication device uses Type 1 LBT for access and the channel access priority used is p, and the transmission is not associated with the corresponding HARQ feedback, the contention window used by the communication device is the latest CW used for the first transmission p .

[0068] Optionally, the first transmission is any downlink transmission. As shown in Figure 4 , the communication device accesses an upcoming transmission based on LBT 3 (Type 1 LBT) without HARQ feedback, for example, a broadcast transmission with a channel access priority of 1. If the first transmission is any downlink transmission, the contention window used by the communication device in LBT 3 is CW1'.

[0069] Optionally, the first transmission is any downlink transmission based on Type 1 LBT. As shown in Figure 4, the communication device accesses an upcoming transmission based on LBT 3 (Type 1 LBT) without HARQ feedback, for example, a broadcast transmission, and the channel access priority of the broadcast transmission is 1. If the first transmission is any downlink transmission based on Type 1 LBT, and LBT 2 in the figure is Type 1 LBT, the contention window used by the communication device in LBT 3 is CW1'.

[0070] Optionally, the first transmission is any downlink transmission based on Type 1 LBT and having a channel access priority of p. As shown in Figure 4, the communication device is not associated with HARQ feedback when accessing an upcoming transmission based on LBT 3 (Type 1 LBT), for example, a broadcast transmission, and the channel access priority of the broadcast transmission is 1. The first transmission is any downlink transmission based on Type 1 LBT and having a channel access priority of 1. In the figure, LBT 1 and LBT 2 are Type 1 LBT, but the channel access priority of the transmission corresponding to LBT 1 is 1, and the channel access priority of the transmission corresponding to LBT 2 is 2. The contention window used by the communication device in LBT 3 is CW1.

[0071] If the first transmission does not exist, the minimum contention window value corresponding to priority p is used. As shown in Figure 4, the communication device is not associated with HARQ feedback when accessing an upcoming transmission based on LBT 3 (Type 1 LBT), for example, a broadcast transmission, and the channel access priority of the broadcast transmission is 1. If the communication device has not performed any transmission before the broadcast transmission, the communication device uses the minimum contention window value allowed by channel access priority 1, i.e., 3, in LBT 3.

[0072] It should be noted that CW 1-4 The contention window corresponding to each priority level after the communication device adjusts it at LBT 1. The contention window corresponding to each priority level after the communication device adjusts it at LBT 2 is also adjusted, namely CW p ', p is an integer from 1 to 4.

[0073] 4. SL Transmission

[0074] SL transmission refers to direct transmission between terminals via sidelinks, unlike traditional cellular systems where communication data is received or sent by base stations. SL transmission (V2V, Vehicle to Vehicle) is also supported in vehicle-to-everything (V2X) systems, resulting in higher spectrum efficiency and lower transmission latency. Two transmission modes for SL transmission have been proposed in related technologies: Mode A and Mode B, as shown in Figure 5.

[0075] Mode A: The transmission resources of the SL UE are allocated by the base station, and the SL UE sends data on the sidelink according to the resources allocated by the base station; the base station can allocate resources for a single transmission to the SL UE, or allocate resources for semi-static transmission to the SL UE.

[0076] Mode B: The SL UE selects resources from the resource pool for data transmission. Specifically, the SL UE may select transmission resources from the resource pool by listening or by random selection.

[0077] SL UE is a terminal that performs sidelink transmission, which can be a terminal in D2D (Device-to-Device) or a vehicle terminal in the Internet of Vehicles.

[0078] The physical layer structure of NR SL is shown in Figure 6.

[0079] The PSCCH (Physical Sidelink Control Channel) is used to transmit primary sidelink control information, and the PSSCH (Physical Sidelink Shared Channel) is used to carry data and secondary sidelink control information. Both PSCCH and PSSCH are transmitted in the same time slot. The primary sidelink control information is carried on the PSCCH and primarily includes fields related to resource sensing, facilitating resource exclusion and selection after decoding by other UEs. In addition to data, the PSSCH also carries secondary sidelink control information, primarily including fields related to data demodulation, facilitating demodulation of the data on the PSSCH by other UEs.

[0080] Broadcast and groupcast or multicast are also supported in SL. UE can send data to all UEs that may receive the PSSCH through the same PSSCH (broadcast). UE can also send data to a group of UEs through the same PSSCH (multicast). For example, this group of UEs can be UEs within a certain distance range, or UEs that have a stable connection with the sending UE.

[0081] 5. HARQ Feedback

[0082] HARQ feedback involves the receiver decoding the data sent by the transmitter. If the decoding fails, it returns a NACK; if the decoding succeeds, it returns an ACK. The transmitter uses the receiver's HARQ feedback to decide whether to retransmit the data. The receiver also combines data sent multiple times by the transmitter to increase the probability of successful decoding.

[0083] Common HARQ feedback methods include NACK-Only and ACK-or-NACK:

[0084] NACK-Only means that the receiving end only sends a NACK signal to the sending end when the reception fails, and does not send a NACK signal when the reception succeeds.

[0085] ACK-or-NACK means that the receiving end feeds back NACK to the sending end when reception fails, and feeds back ACK to the sending end when reception succeeds.

[0086] NACK-only mode presents a DTX (discontinuous transmission) issue. The receiver typically decodes the control information first and then decodes the data based on the control information. If the receiver fails to detect the control information, it will not provide any feedback. With NACK-only mode, the transmitter cannot determine whether the receiver successfully decoded the data or simply failed to detect the control information.

[0087] In SL communication, only ACK-or-NACK feedback is supported for unicast, and both ACK-or-NACK and NACK-only feedback are supported for multicast. In a multicast scenario, the sender sends data to a group of receivers on the same resource.

[0088] When a group of receiving ends feeds back HARQ information in NACK-Only mode, all receiving ends in the group feed back NACK on the same resource. The transmitting end can determine whether to retransmit based on whether NACK is detected on the resource.

[0089] When a group of receivers provides HARQ information via ACK / NACK, all receivers in the group provide ACK or NACK feedback on independent resources. The transmitter can determine whether to retransmit based on the ACK or NACK detected on each resource. For example, if at least one NACK is received, retransmission is performed; if all ACKs are received, retransmission is not performed.

[0090] Exemplarily, the resource used by the receiving end to feed back NACK or ACK is a PSFCH resource.

[0091] At the same time, the SL system also supports blind retransmission, where the transmitter sends a certain number of transmissions and the receiver does not perform HARQ feedback.

[0092] 6. MCSt (Multi-consecutive slots transmission)

[0093] As mentioned above, in the unlicensed spectrum, the communication device needs to perform LBT first, and can only access the channel after the LBT is successful. When the communication device successfully performs LBT and accesses the channel, the time it occupies the channel is called COT. During the COT, the communication device can transmit continuously or discontinuously. Therefore, in order to make more full use of the COT initiated after the LBT is successful, the concept of MCSt transmission is introduced in SL-U (SL in Unlicensed spectrum, SL communication working in the unlicensed spectrum). That is, the communication device transmits continuously in multiple time slots to improve the utilization rate of COT. At the same time, continuous use / occupancy of the channel is also conducive to competing for the channel with other systems. For example, when the SL-U terminal adopts continuous transmission, the WiFi user cannot successfully access the channel through LBT at the same time because the channel is continuously occupied.

[0094] When SL operates in unlicensed spectrum (i.e., SL-U), the terminal device also needs to adjust and determine the contention window when performing Type 1 LBT. According to the above introduction, the SL system supports transmission modes such as ACK-or-NACK, NACK-Only, and blind retransmission. For NACK-only, since the receiving end also needs to perform LBT when sending NACK, it cannot send NACK when LBT fails, which exacerbates its DTX problem. Therefore, in NACK-Only mode, it is difficult to adjust the contention window based on the feedback NACK and then determine the contention window based on the channel access priority. How to determine the contention window for NACK-Only transmission is a problem that needs to be solved. At the same time, SL-U introduces MCSt. How to determine the contention window under MCSt transmission is also a problem that needs to be solved.

[0095] Please refer to Figure 7, which shows a flow chart of a method for determining a contention window provided by an embodiment of the present application. The method can be applied to the network architecture shown in Figure 1. The method is executed by a terminal device. The method may include the following step 710.

[0096] Step 710: If the transmission of the terminal device includes NACK-Only based transmission and / or blind retransmission, the terminal device determines the latest contention window used for the first transmission as the contention window used for the transmission of the terminal device.

[0097] In some embodiments, the latest contention window for the first transmission refers to the contention window most recently determined or adjusted by the terminal device when performing the first transmission, or in other words, the contention window most recently determined or adjusted by the terminal device when performing the most recent first transmission. The most recent first transmission refers to the first transmission that is most recent in time to the transmission of the terminal device.

[0098] As shown in Figure 8, LBT 1 and LBT 2 are the channel access processes corresponding to the ongoing or completed transmission of the terminal device. p refers to the channel access priority of this transmission. For example, the channel access priority of the transmission accessed by the terminal device in LBT 1 is 1, and the channel access priority of the transmission accessed by the terminal device in LBT 2 is 2. CW1 (CW1'), CW2 (CW2'), CW3 (CW3'), and CW4 (CW4') correspond to the contention windows for transmissions with channel access priorities 1, 2, 3, and 4, respectively. Before transmitting based on Type 1 LBT, the terminal device can adjust the contention windows corresponding to each channel access priority. For example, if the LBT 2 performed by the terminal device is Type 1 LBT, CW1, CW2, CW3, and CW4 are adjusted to CW1', CW2', CW3', and CW4'. The channel access priority of the transmission based on Type 1 LBT accessed by the terminal device in LBT 2 is 2, and the contention window used is CW2'.

[0099] In some embodiments, the transmission of the terminal device is based on Type 1 LBT (Type 1 LBT). Transmission based on Type 1 LBT means that the channel access type used by the transmission is Type 1 LBT. Since transmission based on Type 2 LBT does not require the determination of a contention window, transmission based on Type 2 LBT is not considered in the embodiments of the present application.

[0100] In some embodiments, the transmission of the terminal device is an upcoming transmission or a pending transmission. Since the terminal device needs to perform LBT before transmission and needs to monitor the channel according to the contention window during the LBT process, it is necessary to determine the contention window used for the transmission before transmission.

[0101] In some embodiments, the transmission of the terminal device is a sideline transmission. For example, the transmission of the terminal device may include PSCCH and / or PSSCH transmission.

[0102] In some embodiments, the transmission of the terminal device is a sideline transmission based on Type 1 LBT, such as a PSCCH transmission based on Type 1 LBT, or a PSSCH transmission based on Type 1 LBT, etc.

[0103] In some embodiments, the transmission of the terminal device is based on NACK-Only transmission. The NACK-Only transmission means that the receiving end performs HARQ feedback for the transmission of the terminal device based on the NACK-Only mode.

[0104] Exemplarily, as shown in FIG8 , the terminal device accesses the upcoming transmission based on LBT 3 (Type 1 LBT) only including side transmission a, and side transmission a is a side transmission based on NACK-Only, that is, the receiving end performs side HARQ feedback for the data transmitted on side transmission a in a NACK-Only manner.

[0105] In some embodiments, the transmission of the terminal device is a blind retransmission. Blind retransmission means that the transmission of the terminal device is not associated with HARQ feedback.

[0106] For example, as shown in FIG8 , the terminal device's upcoming transmission based on LBT 3 (Type 1 LBT) access only includes side transmission a, which is a blind retransmission, i.e., the receiving end does not need to perform HARQ feedback for the data transmitted on side transmission a.

[0107] In some embodiments, the transmission of the terminal device can be a single time slot transmission or an MCSt.

[0108] In some embodiments, the transmission by the terminal device is a single-slot transmission.

[0109] For example, as shown in FIG8 , each of the sideline transmissions ae represents a single-time-slot transmission. The transmission to be performed by the terminal device based on LBT 3 (Type 1 LBT) access only includes one of the sideline transmissions ae. For example, the transmission of the terminal device is sideline transmission a. For another example, the transmission of the terminal device is sideline transmission d.

[0110] In some embodiments, the transmission of the terminal device is MCSt, which includes multiple consecutive single-time slot transmissions.

[0111] Exemplarily, as shown in FIG8 , the terminal device accesses the upcoming transmission based on LBT 3 (Type 1 LBT) including side transmission ae.

[0112] In some embodiments, the multiple consecutive single-slot transmissions included in MCSt are all NACK-Only based transmissions.

[0113] Exemplarily, as shown in FIG8 , the terminal device accesses the upcoming transmission based on LBT 3 (Type 1 LBT) including side transmissions ae, and the side transmissions ae are all NACK-Only based transmissions.

[0114] In some embodiments, the multiple consecutive single-slot transmissions included in MCSt are all blind retransmissions.

[0115] Exemplarily, as shown in FIG8 , the terminal device accesses the upcoming transmission based on LBT 3 (Type 1 LBT) including side transmissions ae, and the side transmissions ae are all blind retransmissions.

[0116] In some embodiments, the multiple consecutive single-slot transmissions included in MCSt are all NACK-Only based transmissions or blind retransmissions.

[0117] For example, as shown in FIG8 , the terminal device, when accessing based on LBT 3 (Type 1 LBT), is about to perform transmissions including sideline transmissions ae, which are all NACK-only transmissions or blind retransmissions. For example, sideline transmission ac is a NACK-only transmission, and sideline transmission de is a blind retransmission. For another example, sideline transmission ab is a blind retransmission, and sideline transmission ce is a NACK-only transmission.

[0118] In some embodiments, the number of NACK-only transmissions in the multiple consecutive single-slot transmissions included in the MCSt is greater than or equal to a first threshold. Since only one transmission is performed in a time slot, the number of NACK-only transmissions can be understood as the number of NACK-only single-slot transmissions, or the number of NACK-only time slots.

[0119] Exemplarily, as shown in FIG8 , the terminal device, when accessing based on LBT 3 (Type 1 LBT), is about to perform transmissions including sideline transmissions ae, and the number of NACK-only transmissions in the sideline transmissions ae is greater than or equal to a first threshold. For example, the first threshold is 3, and the number of NACK-only transmissions in the sideline transmissions ae is 3, 4, or 5. For example, in the sideline transmissions ae, the sideline transmissions ad are all NACK-only transmissions; for another example, in the sideline transmissions ae, the sideline transmissions ce are all NACK-only transmissions. For another example, the sideline transmissions ae are all NACK-only transmissions.

[0120] In some embodiments, the number of NACK-only transmissions in the multiple consecutive single-slot transmissions included in MCSt is greater than a first threshold. For example, as shown in FIG8 , the terminal device accesses an upcoming transmission based on LBT 3 (Type 1 LBT) including sideline transmissions ae. For example, if the first threshold is 3, the number of NACK-only transmissions in the sideline transmissions ae is 4 or 5. For example, in the sideline transmissions ae, all sideline transmissions be are NACK-only transmissions. For another example, all sideline transmissions ae are NACK-only transmissions.

[0121] In some embodiments, the number of blind retransmissions in the multiple consecutive single-slot transmissions included in MCSt is greater than or equal to the second threshold. Since only one transmission is performed in a time slot, the number of blind retransmissions can be understood as the number of single-slot transmissions of blind retransmissions, or the number of time slots of blind retransmissions.

[0122] For example, as shown in FIG8 , when a terminal device accesses an LBT 3 (Type 1 LBT)-based transmission, the transmission to be performed includes side transmission ae, and the number of blind retransmissions in the side transmission ae is greater than or equal to a second threshold. For example, if the second threshold is 3, the number of blind retransmissions in the side transmission ae is greater than or equal to 3. For example, the number of blind retransmissions in the side transmission ae is 3, 4, or 5. For example, in the side transmission ae, all side transmissions ad are blind retransmissions; for another example, in the side transmission ae, all side transmissions ce are blind retransmissions. For another example, all side transmissions ae are blind retransmissions.

[0123] In some embodiments, the number of blind retransmissions in the plurality of consecutive single-slot transmissions included in MCSt is greater than a second threshold. For exemplary embodiments, reference may be made to the above examples, which will not be described in detail herein.

[0124] In some embodiments, the number of NACK-Only based transmissions and blind retransmissions in the multiple consecutive single-slot transmissions included in the MCSt is greater than or equal to a third threshold.

[0125] Exemplarily, as shown in FIG8 , the terminal device accesses the upcoming transmission based on LBT 3 (Type 1 LBT) including side transmission ae, and the number of NACK-Only-based transmissions and blind retransmissions in the side transmission ae is greater than or equal to the third threshold. For example, if the third threshold is 3, the number of NACK-Only-based transmissions and blind retransmissions in the side transmission ae is greater than or equal to 3. For example, the sum of the number of NACK-Only-based transmissions and blind retransmissions in the side transmission ae is 3 or 4 or 5. For example, in the side transmission ae, the side transmission a is a blind retransmission, and the side transmission bc is a NACK-Only-based transmission; for another example, in the side transmission ae, the side transmission ab is a blind retransmission, and the side transmission cd is a NACK-Only-based transmission. For another example, in the side transmission ae, the side transmission ab is a blind retransmission, and the side transmission ce is a NACK-Only-based transmission.

[0126] In some embodiments, the number of NACK-only transmissions and blind retransmissions in the plurality of consecutive single-slot transmissions included in MCSt is greater than a third threshold. For exemplary embodiments, reference may be made to the above examples, which will not be described in detail herein.

[0127] In some embodiments, the above-mentioned first threshold, second threshold and third threshold can be network configured, pre-configured, pre-defined by the protocol, or implemented based on the terminal device itself, and this application does not limit this.

[0128] Through the above method, a method for determining the contention window is designed for single-slot transmission and MCSt transmission modes to avoid using the same contention window during LBT of multiple terminal devices and reduce mutual interference between terminal devices.

[0129] In some embodiments, the first transmission is a sideways transmission.

[0130] In some embodiments, the first transmission is an arbitrary side transmission.

[0131] Exemplarily, as shown in FIG8 , the transmission to be performed by the terminal device based on LBT 3 (Type 1 LBT) access includes NACK-Only based transmission and / or blind retransmission. If the channel access priority of the terminal device's transmission is 1, the contention window used by the terminal device in LBT 3 is CW1'; if the channel access priority of the terminal device's transmission is 2, the contention window used by the terminal device in LBT 3 is CW2'.

[0132] In some embodiments, the first transmission is a sideline transmission based on Type 1 LBT.

[0133] Exemplarily, as shown in FIG8 , when a terminal device accesses an upcoming transmission based on LBT 3 (Type 1 LBT), including NACK-only transmission and / or blind retransmission, the channel access priority of the terminal device's transmission is 1. If LBT 2 is a sideline transmission based on Type 1 LBT, the contention window used by the terminal device's transmission in LBT 3 is CW1'; if LBT 2 is not a sideline transmission based on Type 1 LBT, and LBT 1 is a sideline transmission based on Type 1 LBT, the contention window used by the terminal device's transmission in LBT 3 is CW1.

[0134] In some embodiments, the contention window used by the terminal device's transmission is determined based on the channel access priority of the terminal device's transmission.

[0135] In some embodiments, if the transmission of the terminal device includes NACK-Only based transmission and / or blind retransmission, the contention window corresponding to the channel access priority of the transmission of the terminal device in the latest contention window used for the first transmission is determined as the contention window used for the transmission of the terminal device.

[0136] For example, if the transmission of the terminal device includes NACK-Only transmission and / or blind retransmission, and the channel access priority of the transmission of the terminal device is p, the contention window used for the transmission of the terminal device is the latest CW used for the first transmission. p .

[0137] In some embodiments, the first transmission is a side transmission based on type 1 LBT, and the channel access priority corresponding to the first transmission is the same as the channel access priority corresponding to the transmission of the terminal device.

[0138] For example, as shown in FIG8 , the transmission to be performed by the terminal device based on LBT 3 (Type 1 LBT) access includes NACK-Only-based transmission and / or blind retransmission. LBT 1 and LBT 2 are both sideline transmissions based on Type 1 LBT, the channel access priority of LBT 1 transmission is 1, and the channel access priority of LBT 2 transmission is 2. If the channel access priority of the terminal device's transmission is 1, the contention window used by the terminal device's transmission in LBT 3 is CW1; if the channel access priority of the terminal device's transmission is 2, the contention window used by the terminal device's transmission in LBT 3 is CW2'.

[0139] In some embodiments, the first transmission is a single-slot transmission, or the first transmission is a MCSt.

[0140] Through the above method, a method for determining the contention window is designed for side transmission under the three transmission modes of NACK-Only, blind retransmission and MCSt, avoiding the use of the same contention window during LBT of multiple terminal devices and reducing mutual interference between terminal devices.

[0141] The embodiments of the present application also provide several methods for determining the channel access priority of the transmission or the first transmission of the terminal device.

[0142] In some embodiments, when the transmission of the terminal device or the first transmission is a single-slot transmission, the channel access priority corresponding to the transmission of the terminal device or the first transmission is the channel access priority corresponding to the single-slot transmission.

[0143] Exemplarily, as shown in FIG8 , the transmission to be performed by the terminal device based on LBT 3 (Type 1 LBT) access only includes side transmission a, that is, the transmission of the terminal device is a single time slot transmission, then the channel access priority of the terminal device's transmission is the channel access priority of side transmission a.

[0144] In some embodiments, when the transmission of the terminal device or the first transmission is MCSt, the channel access priority corresponding to the transmission of the terminal device or the first transmission is the lowest priority of the channel access priorities corresponding to multiple consecutive single-slot transmissions included in MCSt, or the channel access priority corresponding to the first single-slot transmission among the multiple consecutive single-slot transmissions included in MCSt.

[0145] Since the transmission of the terminal device or the first transmission is MCSt, the transmission of the terminal device or the first transmission includes multiple consecutive single-slot transmissions. Therefore, it is necessary to determine the channel access priority corresponding to the transmission of the terminal device or the first transmission based on the channel access priorities corresponding to the above-mentioned multiple single-slot transmissions.

[0146] Exemplarily, as shown in Figure 8, the terminal device's upcoming transmission based on LBT 3 (Type 1 LBT) access includes side transmission ae, that is, the terminal device's transmission is MCSt, then the channel access priority of the terminal device's transmission is the lowest priority of the channel transmission priorities corresponding to the side transmission ae, or the channel access priority of the terminal device's transmission is the channel access priority corresponding to the first single-slot transmission (that is, side transmission a) in the side transmission ae.

[0147] In some embodiments, the channel access priority may be represented by a priority value. In some embodiments, a smaller priority value indicates a higher channel access priority; in some embodiments, a larger priority value indicates a higher channel access priority.

[0148] For example, the priority values ​​of the channel access priorities corresponding to the sideline transmissions ae are 1, 1, 2, 4, and 3, respectively. The smaller the priority value, the higher the channel access priority. If the channel access priority of the terminal device's transmission is the lowest priority of the channel transmission priorities corresponding to the sideline transmissions ae, then the channel access priority of the terminal device's transmission is 4. If the channel access priority of the terminal device's transmission is the channel access priority corresponding to the first single-slot transmission in the sideline transmissions ae (i.e., the sideline transmission a), then the channel access priority of the terminal device's transmission is 1.

[0149] Through the above method, in sideline communication, the terminal device can determine the channel access priority of the terminal device's transmission or the first transmission, and further determine the contention window used by the terminal device's sideline transmission. This prevents multiple terminal devices from using the same contention window during LBT, thereby reducing mutual interference between the terminal devices.

[0150] The present application also provides a method for determining a contention window used for transmission of a terminal device when there is no first transmission.

[0151] In some embodiments, as shown in FIG. 9 , the method may further include the following step 720 .

[0152] Step 720: If there is no first transmission, the terminal device determines the minimum value of the contention window corresponding to the channel access priority corresponding to the transmission of the terminal device as the contention window used for the transmission of the terminal device.

[0153] In some embodiments, the first transmission is any side transmission, and the absence of the first transmission means that the terminal device does not perform any side transmission before the transmission of the terminal device.

[0154] Exemplarily, as shown in FIG8 , when the terminal device accesses the upcoming transmission based on LBT 3 (Type 1 LBT), including NACK-Only-based transmission and / or blind retransmission, and LBT 1 and LBT 2 are unsuccessful, and the terminal device does not perform side transmission, then the first transmission does not exist.

[0155] In some embodiments, the first transmission is a sideline transmission based on Type 1 LBT, and the absence of the first transmission means that the terminal device does not perform a sideline transmission based on Type 1 LBT before the transmission of the terminal device.

[0156] Exemplarily, as shown in FIG8 , when the terminal device accesses the upcoming transmission based on LBT 3 (Type 1 LBT) including NACK-Only-based transmission and / or blind retransmission, and both LBT 1 and LBT 2 are not Type 1 LBT, there is no first transmission.

[0157] In some embodiments, the first transmission is a side transmission based on Type 1 LBT, and the channel access priority corresponding to the first transmission is the same as the channel access priority corresponding to the transmission of the terminal device; then the absence of the first transmission means that before the transmission of the terminal device, the terminal device did not perform a side transmission based on Type 1 LBT and the channel access priority is the same as the channel access priority of the transmission of the terminal device.

[0158] Exemplarily, as shown in FIG8 , when a terminal device accesses an upcoming transmission based on LBT 3 (Type 1 LBT), including NACK-Only-based transmission and / or blind retransmission, the channel access priority of the transmission of the terminal device is 3. However, the channel access priority of the transmission corresponding to LBT 1 of the terminal device is 1, and the channel access priority of the transmission corresponding to LBT 2 is 2, that is, there is no first transmission.

[0159] In some embodiments, if the first transmission does not exist, the minimum value of the contention window corresponding to the channel access priority corresponding to the transmission of the terminal device is determined as the contention window used for the transmission of the terminal device. That is, according to Table 1, the minimum value of the contention window corresponding to the channel access priority corresponding to the transmission of the terminal device is determined as the contention window used for the transmission of the terminal device.

[0160] Exemplarily, if the channel access priority of the terminal device's transmission is 1, the contention window used for the terminal device's transmission is the minimum value of the contention window allowed by the channel access priority 1, that is, 3. If the channel access priority of the terminal device's transmission is 2, the contention window used for the terminal device's transmission is the minimum value of the contention window allowed by the channel access priority 2, that is, 7. If the channel access priority of the terminal device's transmission is 3, the contention window used for the terminal device's transmission is the minimum value of the contention window allowed by the channel access priority 3, that is, 15. If the channel access priority of the terminal device's transmission is 4, the contention window used for the terminal device's transmission is the minimum value of the contention window allowed by the channel access priority 4, that is, 15.

[0161] By using the above method, in sideline communication, even when there is no first transmission, the terminal device can determine the contention window used for the sideline transmission of the terminal device, thereby avoiding the use of the same contention window by multiple terminal devices during LBT and reducing mutual interference between the terminal devices.

[0162] The technical solution provided by the embodiment of the present application, in side communication, by determining the latest contention window used for the first transmission as the contention window used for the side transmission of the terminal device, a method for determining the contention window is designed for the two transmission modes of NACK-Only and blind retransmission, so as to avoid using the same contention window during LBT of multiple terminal devices and reduce mutual interference between terminal devices.

[0163] The following are device embodiments of the present application, which can be used to implement the method embodiments of the present application. For details not disclosed in the device embodiments of the present application, please refer to the method embodiments of the present application.

[0164] Please refer to Figure 10, which shows a block diagram of an apparatus for determining a contention window according to one embodiment of the present application. This apparatus has the functionality to implement the aforementioned exemplary method for determining a contention window on the terminal device side. This functionality can be implemented in hardware or by hardware executing corresponding software. This apparatus can be the terminal device described above, or it can be provided within a terminal device. As shown in Figure 10, the apparatus 1000 may include a processing module 1010.

[0165] The processing module 1010 is configured to determine, if the transmission of the terminal device includes NACK-Only based transmission and / or blind retransmission, the latest contention window used for the first transmission as the contention window used for the transmission of the terminal device.

[0166] In some embodiments, the transmission of the terminal device is based on Type 1 Listen Before Talk (LBT) transmission.

[0167] In some embodiments, the transmission of the terminal device is a sideline transmission.

[0168] In some embodiments, the transmission of the terminal device is a multi-continuous time slot transmission MCSt, and the MCSt includes multiple continuous single time slot transmissions.

[0169] In some embodiments, the multiple consecutive single-slot transmissions included in the MCSt are all NACK-Only based transmissions; or,

[0170] The multiple consecutive single-slot transmissions included in the MCSt are all blind retransmissions; or,

[0171] The multiple consecutive single-slot transmissions included in the MCSt are all NACK-only transmissions or blind retransmissions; or,

[0172] The number of NACK-only transmissions in the multiple consecutive single-slot transmissions included in the MCSt is greater than or equal to a first threshold; or,

[0173] The number of blind retransmissions in the multiple consecutive single-slot transmissions included in the MCSt is greater than or equal to a second threshold; or,

[0174] The number of NACK-only based transmissions and blind retransmissions in the multiple consecutive single-slot transmissions included in the MCSt is greater than or equal to a third threshold.

[0175] In some embodiments, the transmission of the terminal device is an upcoming transmission or a pending transmission.

[0176] In some embodiments, the first transmission is an arbitrary side transmission.

[0177] In some embodiments, the first transmission is a sideline transmission based on Type 1 LBT.

[0178] In some embodiments, the first transmission is a side transmission based on type 1 LBT, and the channel access priority corresponding to the first transmission is the same as the channel access priority corresponding to the transmission of the terminal device.

[0179] In some embodiments, the first transmission is a single-slot transmission, or the first transmission is a MCSt.

[0180] In some embodiments, the processing module 1010 is further used to determine the minimum value of the contention window corresponding to the channel access priority corresponding to the transmission of the terminal device as the contention window used for the transmission of the terminal device if the first transmission does not exist.

[0181] In some embodiments, when the transmission of the terminal device or the first transmission is a single-slot transmission, the channel access priority corresponding to the transmission of the terminal device or the first transmission is the channel access priority corresponding to the single-slot transmission; or

[0182] In the case where the transmission of the terminal device or the first transmission is MCSt, the channel access priority corresponding to the transmission of the terminal device or the first transmission is the lowest priority of the channel access priorities corresponding to multiple consecutive single-slot transmissions included in the MCSt, or the channel access priority corresponding to the first single-slot transmission among the multiple consecutive single-slot transmissions included in the MCSt.

[0183] The technical solution provided by the embodiment of the present application, in side communication, by determining the latest contention window used for the first transmission as the contention window used for the side transmission of the terminal device, a method for determining the contention window is designed for the two transmission modes of NACK-Only and blind retransmission, so as to avoid using the same contention window during LBT of multiple terminal devices and reduce mutual interference between terminal devices.

[0184] It should be noted that the device provided in the above embodiment only uses the division of the above-mentioned functional modules as an example to implement its functions. In actual applications, the above-mentioned functions can be assigned to different functional modules according to actual needs, that is, the content structure of the device can be divided into different functional modules to complete all or part of the functions described above.

[0185] Regarding the apparatus in the above embodiment, the specific manner in which each module performs operations has been described in detail in the embodiment of the method, and will not be elaborated here.

[0186] Please refer to Figure 11, which shows a schematic diagram of the structure of a terminal device provided by an embodiment of the present application. The terminal device 1100 may include: a processor 1101, a transceiver 1102, and a memory 1103. The processor 1101 is used to implement the functions of the processing module 1010 described above.

[0187] The processor 1101 includes one or more processing cores, and executes various functional applications and information processing by running software programs and modules. The processor 1101 is used to execute other steps except the sending and receiving steps executed by the terminal device in the above method embodiment.

[0188] Transceiver 1102 may include a receiver and a transmitter. For example, the receiver and transmitter may be implemented as the same wireless communication component, which may include a wireless communication chip and a radio frequency antenna. Transceiver 1102 is configured to perform the sending and / or receiving steps performed by the terminal device in the above method embodiment.

[0189] The memory 1103 may be connected to the processor 1101 and the transceiver 1102 .

[0190] The memory 1103 may be used to store a computer program executed by the processor, and the processor 1101 is used to execute the computer program to implement each step in the above method embodiment.

[0191] In addition, the memory can be implemented by any type of volatile or non-volatile storage device or a combination thereof, including but not limited to: magnetic or optical disks, electrically erasable programmable read-only memory, erasable programmable read-only memory, static access memory, read-only memory, magnetic memory, flash memory, and programmable read-only memory.

[0192] In an exemplary embodiment, the processor 1101 is configured to determine the latest contention window used for the first transmission as the contention window used for the transmission of the terminal device if the transmission of the terminal device includes NACK-Only based transmission and / or blind retransmission.

[0193] For details not described in detail in this embodiment, please refer to the above embodiments and will not be described in detail here.

[0194] An embodiment of the present application also provides a computer-readable storage medium, wherein a computer program is stored in the storage medium, and the computer program is used to be executed by a processor to implement the above-mentioned method for determining the contention window. Optionally, the computer-readable storage medium may include: ROM (Read-Only Memory), RAM (Random-Access Memory), SSD (Solid State Drives) or an optical disk, etc. Among them, the random access memory may include ReRAM (Resistance Random Access Memory) and DRAM (Dynamic Random Access Memory).

[0195] An embodiment of the present application further provides a chip, which includes a programmable logic circuit and / or program instructions. When the chip is running, it is used to implement the above-mentioned method for determining the contention window.

[0196] An embodiment of the present application further provides a computer program product, which includes a computer program stored in a computer-readable storage medium. A processor reads and executes the computer program from the computer-readable storage medium to implement the above-mentioned method for determining a contention window.

[0197] It should be understood that the "indication" mentioned in the embodiments of this application can be a direct indication, an indirect indication, or an indication of an association. For example, "A indicates B" can mean that A directly indicates B, for example, B can be obtained through A; it can also mean that A indirectly indicates B, for example, A indicates C, and B can be obtained through C; it can also mean that there is an association between A and B.

[0198] In the description of the embodiments of the present application, the term "corresponding" may indicate a direct or indirect correspondence between the two, or an association relationship between the two, or a relationship between indication and being indicated, configuration and being configured, etc.

[0199] In some embodiments of the present application, "predefined" may be implemented by pre-storing corresponding codes, tables, or other methods that can be used to indicate relevant information in a device (e.g., including a terminal device and a network device), and the present application does not limit the specific implementation method. For example, predefined may refer to information defined in a protocol.

[0200] In some embodiments of the present application, the "protocol" may refer to a standard protocol in the field of communications, for example, it may include an LTE protocol, a NR protocol, and related protocols used in future communication systems, and this application does not limit this.

[0201] In this document, "plurality" refers to two or more. "And / or" describes a relationship between associated objects, indicating that three possible relationships exist. For example, "A and / or B" can mean: A exists alone, A and B exist simultaneously, or B exists alone. The character " / " generally indicates an "or" relationship between the associated objects.

[0202] The term “greater than or equal to” mentioned herein may mean greater than or equal to, or greater than, and the term “less than or equal to” may mean less than or equal to, or less than.

[0203] In addition, the step numbers described in this document only illustrate a possible execution order between the steps. In some other embodiments, the above steps may not be executed in the order of the numbers, such as two steps with different numbers are executed at the same time, or two steps with different numbers are executed in the opposite order of the diagram. The embodiments of the present application are not limited to this.

[0204] Those skilled in the art will appreciate that in one or more of the above examples, the functions described in the embodiments of the present application can be implemented using hardware, software, firmware, or any combination thereof. When implemented using software, these functions can be stored in a computer-readable medium or transmitted as one or more instructions or codes on a computer-readable medium. Computer-readable media include computer storage media and communication media, wherein communication media include any media that facilitates the transmission of computer programs from one place to another. The storage medium can be any available medium that can be accessed by a general-purpose or special-purpose computer.

[0205] The above description is merely an exemplary embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present application shall be included in the scope of protection of the present application.

Claims

1. A method for determining a contention window, characterized in that: The method is performed by a terminal device, and the method includes: If the transmission of the terminal device includes NACK-Only based transmission and / or blind retransmission, the latest contention window used for the first transmission is determined as the contention window used for the transmission of the terminal device.

2. The method according to claim 1, characterized in that The transmission of the terminal device is based on Type 1 Listen Before Talk (LBT).

3. The method according to claim 1 or 2, characterized in that: The transmission of the terminal device is side transmission.

4. The method according to any one of claims 1 to 3, characterized in that: The transmission of the terminal device is a multiple continuous time slot transmission MCSt, and the MCSt includes multiple continuous single time slot transmissions.

5. The method according to claim 4, characterized in that The multiple consecutive single-slot transmissions included in the MCSt are all NACK-Only based transmissions; or, The multiple consecutive single-slot transmissions included in the MCSt are all blind retransmissions; or, The multiple consecutive single-slot transmissions included in the MCSt are all NACK-Only based transmissions or blind retransmissions; or, The number of NACK-Only based transmissions in the multiple consecutive single-slot transmissions included in the MCSt is greater than or equal to a first threshold; or, The number of blind retransmissions in the multiple consecutive single-slot transmissions included in the MCSt is greater than or equal to a second threshold; or, The number of NACK-Only based transmissions and blind retransmissions in the multiple consecutive single-slot transmissions included in the MCSt is greater than or equal to a third threshold.

6. The method according to any one of claims 1 to 5, characterized in that: The transmission of the terminal device is an upcoming transmission or a pending transmission.

7. The method according to any one of claims 1 to 6, characterized in that: The first transmission is an arbitrary side transmission.

8. The method according to any one of claims 1 to 6, characterized in that: The first transmission is a sideline transmission based on type 1 LBT.

9. The method according to any one of claims 1 to 6, characterized in that: The first transmission is a side transmission based on type 1 LBT, and the channel access priority corresponding to the first transmission is the same as the channel access priority corresponding to the transmission of the terminal device.

10. The method according to any one of claims 1 to 9, characterized in that: The first transmission is a single-slot transmission, or the first transmission is MCSt.

11. The method according to any one of claims 1 to 10, characterized in that: The method further comprises: If the first transmission does not exist, the minimum value of the contention window corresponding to the channel access priority corresponding to the transmission of the terminal device is determined as the contention window used by the transmission of the terminal device.

12. The method according to any one of claims 1 to 11, characterized in that: In the case where the transmission of the terminal device or the first transmission is a single-slot transmission, the channel access priority corresponding to the transmission of the terminal device or the first transmission is the channel access priority corresponding to the single-slot transmission; or, In the case where the transmission of the terminal device or the first transmission is MCSt, the channel access priority corresponding to the transmission of the terminal device or the first transmission is the lowest priority of the channel access priorities corresponding to multiple consecutive single-slot transmissions included in the MCSt, or is the channel access priority corresponding to the first single-slot transmission among the multiple consecutive single-slot transmissions included in the MCSt.

13. A device for determining a contention window, characterized in that: The device comprises: The processing module is used to determine the latest contention window used for the first transmission as the contention window used for the transmission of the terminal device if the transmission of the terminal device includes NACK-Only-based transmission and / or blind retransmission.

14. The device according to claim 13, characterized in that The transmission of the terminal device is based on Type 1 Listen Before Talk (LBT).

15. The device according to claim 13 or 14, characterized in that The transmission of the terminal device is side transmission.

16. The device according to any one of claims 13 to 15, characterized in that The transmission of the terminal device is a multiple continuous time slot transmission MCSt, and the MCSt includes multiple continuous single time slot transmissions.

17. The device according to claim 16, characterized in that The multiple consecutive single-slot transmissions included in the MCSt are all NACK-Only based transmissions; or, The multiple consecutive single-slot transmissions included in the MCSt are all blind retransmissions; or, The multiple consecutive single-slot transmissions included in the MCSt are all NACK-Only based transmissions or blind retransmissions; or, The number of NACK-Only based transmissions in the multiple consecutive single-slot transmissions included in the MCSt is greater than or equal to a first threshold; or, The number of blind retransmissions in the multiple consecutive single-slot transmissions included in the MCSt is greater than or equal to a second threshold; or, The number of NACK-Only based transmissions and blind retransmissions in the multiple consecutive single-slot transmissions included in the MCSt is greater than or equal to a third threshold.

18. The device according to any one of claims 13 to 17, characterized in that The transmission of the terminal device is an upcoming transmission or a pending transmission.

19. The device according to any one of claims 13 to 18, characterized in that The first transmission is an arbitrary side transmission.

20. The device according to any one of claims 13 to 18, characterized in that The first transmission is a sideline transmission based on type 1 LBT.

21. The device according to any one of claims 13 to 18, characterized in that The first transmission is a side transmission based on type 1 LBT, and the channel access priority corresponding to the first transmission is the same as the channel access priority corresponding to the transmission of the terminal device.

22. The device according to any one of claims 13 to 21, characterized in that The first transmission is a single-slot transmission, or the first transmission is MCSt.

23. The device according to any one of claims 13 to 22, characterized in that The processing module is further used to determine, if the first transmission does not exist, the minimum value of the contention window corresponding to the channel access priority corresponding to the transmission of the terminal device as the contention window used for the transmission of the terminal device.

24. The device according to any one of claims 13 to 23, characterized in that In the case where the transmission of the terminal device or the first transmission is a single-slot transmission, the channel access priority corresponding to the transmission of the terminal device or the first transmission is the channel access priority corresponding to the single-slot transmission; or, In the case where the transmission of the terminal device or the first transmission is MCSt, the channel access priority corresponding to the transmission of the terminal device or the first transmission is the lowest priority of the channel access priorities corresponding to multiple consecutive single-slot transmissions included in the MCSt, or is the channel access priority corresponding to the first single-slot transmission among the multiple consecutive single-slot transmissions included in the MCSt.

25. A terminal device, characterized in that: The terminal device comprises a processor and a memory, wherein a computer program is stored in the memory, and the processor executes the computer program to implement the method according to any one of claims 1 to 12.

26. A computer-readable storage medium, characterized in that: The storage medium stores a computer program, and the computer program is used to be executed by a processor to implement the method according to any one of claims 1 to 12.

27. A chip, characterized in that: The chip comprises a programmable logic circuit and / or program instructions, and when the chip is running, it is used to implement the method according to any one of claims 1 to 12.

28. A computer program product, characterized in that The computer program product comprises computer instructions, which are stored in a computer-readable storage medium. A processor reads and executes the computer instructions from the computer-readable storage medium to implement the method according to any one of claims 1 to 12.

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