A method and device for unlicensed sidelink channel sharing access

Abstract

This application discloses an unlicensed sidelink channel sharing access method, comprising the following steps: using a Type 2 LBT mechanism for channel access; listening for the sidelink control information (SCI) of the first transmission time slot where a COT collision occurs; in response to the SCI indicating that the second transmission time slot resource after the COT collision has ended has not been preempted, using the transmission opportunity indicated by the COT for transmission, or, in response to the SCI indicating that the first terminal in the first transmission time slot has acquired transmission resources, sending signaling through the transmission resources to update the transmission opportunity indicated by the COT so that at least a portion of it is located in the second transmission time slot. This application also includes apparatus for implementing the method. This application solves the problem of COT interruption caused by COT collisions.

Description

Technical Field

[0001] This application relates to the field of wireless communication technology, and in particular to an unlicensed portable link channel sharing access method and device. Background Technology

[0002] After introducing unlicensed channel access technology for communication between devices, terminals enter a channel via the LBT (listen beforetalk) mechanism. When the listening channel is not busy, the terminal accesses the channel for data transmission. A single channel access by a terminal can occupy a certain duration, which is the COT (Channel Occupancy Time) mechanism. This means a terminal can issue a COT indication, instructing to continuously occupy multiple time slots for data transmission. Transmission between different time slots can use the Type 2 LBT mechanism for channel access. Terminals initiating COT indications can also share COTs, instructing other terminals to use the time slot indicated by the COT for data transmission. In practical applications, the COT mechanism used for inter-terminal communication can lead to COT collisions.

[0003] When COT (Cross-Link Access) is interrupted, the channel may be preempted by other SL (Single-Level UE) or Wi-Fi UE, affecting subsequent COT transmission. The terminal will then switch to Type 1 LBT (Low-Level Link Adapter) for channel access, reducing channel access efficiency. Therefore, a corresponding mechanism is needed to handle subsequent transmissions after a COT collision-induced interruption. Currently, the 3GPP task group RAN1 is developing a standard for unlicensed sidelink channel access, stipulating that the terminal initiating COT can use it to transmit data to other terminals, or share the COT for other terminals to transmit data to the initiating terminal. However, a solution for handling transmissions after a COT collision is still lacking. Summary of the Invention

[0004] This application proposes an unlicensed portable link channel sharing access method and apparatus, which solves the COT interruption problem caused by COT collision.

[0005] This application proposes an unlicensed sidelink channel sharing access method, including the following steps:

[0006] Channel access is performed using the Type 2 LBT mechanism;

[0007] Listen for the side link control information (SCI) of the first transmission time slot where a COT collision occurs;

[0008] If the second transmission time slot resource following the completion of the COT collision as indicated by the SCI is not preempted, transmission will proceed using the transmission opportunity indicated by the COT, or...

[0009] In response to the SCI indicating that the first terminal has acquired transmission resources in the first transmission slot, signaling is sent through the transmission resources to update the transmission opportunities indicated by the COT so that at least a portion of them are located in the second transmission slot.

[0010] Furthermore, it may also include the following steps:

[0011] If the second transmission slot resource is occupied after the SCI indicates that the COT collision has ended, the transmission opportunity on that resource is discarded.

[0012] Alternatively, in response to the failure to detect SCI in the first transmission slot where a COT collision occurs, the system switches to Type 1LBT for channel listening in order to obtain a transmission opportunity.

[0013] In some embodiments of the unlicensed sidelink channel sharing access method of this application, the COT sent by the first terminal causes the collision; the first terminal performs the listening and the response. In another embodiment of the unlicensed sidelink channel sharing access method of this application, the COT sent by the first terminal causes the collision; the second terminal performs the listening and the response.

[0014] Preferably, in a scenario where the second terminal cancels sending data to the first terminal due to a COT collision in the first transmission time slot, and the first terminal sends data to a certain terminal in the second transmission time slot, the second terminal sends data to the fourth terminal without collision in the first transmission time slot. Power control is performed based on the larger of the first path loss and the second path loss, where the first path loss is the line loss between the first terminal and the second terminal, and the second path loss is the line loss between the second terminal and the fourth terminal.

[0015] Preferably, in a scenario where the first terminal cancels data transmission to a certain terminal due to a COT collision in the first transmission time slot, and the second terminal transmits data to the first terminal in the second transmission time slot, the first terminal transmits data to a collision-free fourth terminal in the first transmission time slot. Power control is performed based on the larger of the first path loss and the third path loss, where the first path loss is the line loss between the first terminal and the second terminal, and the third path loss is the line loss between the first terminal and the fourth terminal.

[0016] Preferably, in the scenario where the first terminal sends data to the third terminal in the first transmission time slot and the first terminal sends data to the second terminal in the second transmission time slot, the first terminal sends data to the third terminal in the first transmission time slot, and power control is performed based on the larger of the first path loss and the fourth path loss, wherein the first path loss is the line loss between the first terminal and the second terminal, and the fourth path loss is the line loss between the first terminal and the third terminal.

[0017] In one embodiment of this application, a COT collision occurs when the first terminal sends data to the second terminal in the first transmission time slot. The first terminal persists in sending data to the second terminal in the first transmission time slot to avoid COT interruption.

[0018] In a further optimized embodiment of this application, the collision occurs when the COT sent by the first terminal occurs; when the first terminal performs the listening and the response, in response to the transmission resources acquired by the first terminal in the first transmission time slot indicated by the SCI, the step of sending signaling through the transmission resources to update the transmission opportunities indicated by the COT so that at least a portion of them are located in the second transmission time slot includes: the first terminal sending signaling to update the transmission opportunities indicated by the COT and releasing the first transmission time slot. If the terminal that preempts the first transmission time slot is a second terminal sharing the COT of the first terminal, then the first terminal sends signaling to update the transmission opportunities indicated by the COT, including the transmission time slot occupied by the second terminal.

[0019] This application also proposes a terminal device for implementing the method described in any embodiment of this application. The terminal device includes a receiving module, a determining module, and a sending module.

[0020] The receiving module is used to listen for SCI;

[0021] The determining module is used to determine the idle time slots in the first transmission time slot and the second transmission time slot; it is also used to determine or update the transmission opportunities indicated by COT.

[0022] The sending module is used to send signaling or transmit data.

[0023] This application also proposes a computer-readable storage medium storing a computer program thereon, which, when executed by a processor, implements the methods described in any embodiment of this application.

[0024] Furthermore, this application also proposes a terminal device, including a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that the processor executes the computer program to implement the method described in any one of the embodiments of this application.

[0025] The above-described technical solutions adopted in the embodiments of this application can achieve the following beneficial effects:

[0026] Addressing channel occupancy time (COT) collisions can effectively reduce resource reselection for terminals when COT is interrupted, enabling terminals to quickly access channels based on unoccupied COT resources and improving data transmission efficiency. Attached Figure Description

[0027] The accompanying drawings, which are included to provide a further understanding of this application and form part of this application, illustrate exemplary embodiments and are used to explain this application, but do not constitute an undue limitation of this application. In the drawings:

[0028] Figure 1 A schematic diagram illustrating a COT collision caused by half-duplex transmission and reception of equipment.

[0029] Figure 2 A schematic diagram illustrating COT collisions caused by resource overlap;

[0030] Figure 3 A diagram illustrating COT collisions caused by resource contention;

[0031] Figure 4 This is a flowchart illustrating an embodiment of the method of this application;

[0032] Figure 5 An embodiment of a first terminal listening and responding to a resource conflict sent by a first terminal COT instruction;

[0033] Figure 6 An embodiment of a first terminal listening and responding to a resource conflict indicated by a first terminal's COT;

[0034] Figure 7 An embodiment of a second terminal listening and responding to a resource conflict indicated by a first terminal's COT (Content Response Time) signal.

[0035] Figure 8 An embodiment of a resource conflict sent by a first terminal COT, with the second terminal listening and responding;

[0036] Figure 9 An example of a transmitting terminal listening and responding after a COT collision caused by half-duplex operation;

[0037] Figure 10 An example of how the first terminal changes the COT indication information due to a COT collision;

[0038] Figure 11 Another embodiment of the first terminal changing COT indication information due to COT collision;

[0039] Figure 12 This is a schematic diagram of an embodiment of the terminal device;

[0040] Figure 13 This is a schematic diagram of another embodiment of the terminal device. Detailed Implementation

[0041] To make the objectives, technical solutions, and advantages of this application clearer, the technical solutions of this application will be clearly and completely described below in conjunction with specific embodiments and corresponding drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0042] The technical solutions provided by the various embodiments of this application are described in detail below with reference to the accompanying drawings.

[0043] Figure 1 A schematic diagram of a COT collision caused by half-duplex transmission and reception of equipment.

[0044] The device's half-duplex operation causes a COT collision. The first terminal (UE1) and the second terminal (UE2) indicate different COTs, COT1 and COT2, respectively. These correspond to transmission opportunities in different frequency domain resources within the same time slot on an RB set. In transmission slot Slot 3, the transmission opportunity indicated by COT1 is used for UE1 to send data to UE3, while the transmission opportunity indicated by COT2 is used for UE3 to send data to UE2. Since UE3 cannot transmit and receive simultaneously, it can only choose to receive or transmit, thus causing a half-duplex problem. If UE3, after detecting the COT1 and COT2 collision, chooses to use the transmission opportunity indicated by UE1's COT1, and no data is transmitted in the corresponding Slot 3's COT2, then UE2's COT2 will experience an interruption. A mechanism is needed to handle how UE2's COT2 is handled after this interruption.

[0045] Figure 2 This is a diagram illustrating a COT collision caused by resource overlap.

[0046] Resource overlap causes COT collisions, for example Figure 2 As shown, the first terminal (UE1) and the second terminal (UE2) indicate different COTs, namely COT1 and COT2, which correspond to transmission opportunities of different frequency domain resources in the same time slot on the same RB set. In transmission time slot Slot 3, the transmission opportunity indicated by COT1 is used for the third terminal (UE3) to send data to UE1, and the transmission opportunity indicated by COT2 is used for UE3 to send data to UE2. However, the COT indicated resources in this time slot overlap, resulting in a COT collision. In time slot Slot 3, UE3 can only choose one of the transmission opportunities indicated by COT1 and COT2 to send data. If UE3 chooses to use the transmission opportunity indicated by UE1's COT1, there is no data transmission in the corresponding COT2 in Slot 3. Due to the sidelink power control mechanism, UE2 may not be able to detect the data sent by UE3 to UE1, which may also cause UE2's COT2 to be interrupted.

[0047] Figure 3 A diagram illustrating COT collisions caused by resource contention.

[0048] Resource contention causes a COT collision. The first terminal (UE1) accesses the channel using the LBT mechanism in RB set1 and indicates COT1. The second terminal (UE2) accesses the channel using the LBT mechanism in RB set2 and indicates COT2. UE2's transmission service priority is higher than UE1's, satisfying the channel contention condition. Therefore, in transmission slots Slot2 and Slot3, it uses extended CP technology to preferentially occupy the channel. That is, the extended CP length CPE2 used by COT2 to access the channel is longer than the extended CP length CPE1 used by COT1 to access the channel. At this time, the corresponding transmitting device of COT1 in slot 2 or Slot 3 performs Type 2 LBT listening to access the channel. If it detects that the channel is occupied and in a busy state, it will not access the channel. Because of COT2's channel occupation, COT1 will also experience a COT interruption.

[0049] Figure 4 This is a flowchart illustrating an embodiment of the method of this application.

[0050] Step 10: Unlicensed sidelink channels use the Type 2 LBT mechanism for channel access.

[0051] During unlicensed sidelink channel sharing access, the terminal enters the channel via the LBT (listen before talk) mechanism. When the listening channel is not busy, the terminal accesses the channel for data transmission. A single channel access session can occupy a certain duration, known as the COT (Content on Talk) mechanism: the terminal issues a COT indication, instructing to continuously occupy multiple time slots for data transmission. Transmission between different time slots can use the Type 2 LBT mechanism for channel access. Terminals that initiate COT indications can share COT, meaning other terminals can be instructed to use the time slot indicated by the COT for data transmission (sending or receiving).

[0052] For example, a first terminal uses the LBT mechanism to acquire channel resources and issues a Channel Occupancy Time (COT) indication via a first signaling. The COT refers to a transmission time slot resource that occupies a certain channel duration. The first terminal initiates the COT indication and shares it with other terminals. This COT sharing means that the first terminal can use the specified transmission time slot in the COT to send transmission data to different terminals, or it can instruct a second terminal to use the specified transmission time slot in the COT to send transmission data to the first terminal.

[0053] Step 20: Listen for the Side Link Control Information (SCI) of the first transmission time slot where the COT collision occurs.

[0054] The COT collision includes three scenarios, such as Figures 1-3 As shown.

[0055] Scenario 1: Half-duplex transmission and reception by the device causes COT collision.

[0056] Scenario 2: Resource overlap causes COT collision

[0057] Scenario 3: Resource contention leads to COT clashes

[0058] Specific scenarios where COT interruption is caused by COT collision, such as Figures 5-8 As shown.

[0059] Step 30: Change the transmission opportunity indicated by COT, and or, continue the transmission opportunity indicated by COT after the collision ends.

[0060] When resource preemption occurs on a COT-indicated time slot, the terminal can update the COT indication. Specific implementation details are provided below. On a COT collision time slot, i.e., a transmission time slot following a time slot where a COT interruption may occur, the corresponding transmitting terminal can determine whether to select the corresponding COT resource for data transmission based on the channel sensing status on the COT collision time slot.

[0061] Specifically, changing the transmission opportunity indicated by COT involves: responding to the transmission resources acquired by the first terminal in the first transmission time slot indicated by SCI, sending signaling through the transmission resources to update the transmission opportunity indicated by COT so that at least a portion of it is located in the second transmission time slot.

[0062] After the collision ends, the transmission opportunity indicated by COT continues. In particular, when the data transmission corresponding to the COT collision time slot (i.e., the first transmission time slot) is cancelled, the transmitting terminal in the subsequent transmission time slot (i.e., the second transmission time slot) performs the corresponding data transmission according to the data transmission status of the COT collision time slot. Specifically: in response to the SCI indicating that the second transmission time slot resource after the COT collision ends has not been preempted, the transmitting terminal in the second transmission time slot uses the transmission opportunity indicated by COT to perform transmission.

[0063] Step 40: The first transmission time slot transmitting terminal performs power control.

[0064] In the COT collision time slot, the transmitting terminal performs power control based on the larger path loss value between the corresponding receiving terminals in the collision time slot, and between the transmitting terminal or receiving terminal after the COT collision time slot, in order to improve the probability of the transmitting terminal detecting data transmission in the COT collision time slot in the transmission time slot after the COT collision. Specific embodiments are described below.

[0065] Step 50, COT persistent failure response.

[0066] If the second transmission slot resource is occupied after the SCI indicates that the COT collision has ended, the transmission opportunity on that resource is discarded.

[0067] Alternatively, in response to the failure to detect SCI in the first transmission slot where a COT collision occurs, the system switches to Type 1LBT to perform channel sensing and acquire transmission opportunities.

[0068] Step 40 above is optional. If step 30 fails, proceed to step 50.

[0069] It should be noted that the above steps are used for network entities in a wireless communication system, including terminal devices, network-side devices, or other intermediate devices; the above steps can also be used for service devices that provide information processing for the network entity devices; the above steps can also be used for any device, system, subsystem, circuit, chip, or software entity that provides information reception, transmission, identification, and processing for terminal devices or network-side devices.

[0070] In some embodiments of the unlicensed sidelink channel sharing access method of this application, the collision occurs when the COT sent by the first terminal occurs, and the first terminal performs the listening and the response, for example... Figures 5-6 As shown.

[0071] Figure 5 This is an embodiment of a first terminal listening and responding to a resource conflict indicated by a COT (Content Override) signal. Due to resource overlap, the first terminal cancels data transmission to the second terminal during the COT collision time slot (first transmission time slot). In the subsequent COT transmission time slot (second transmission time slot), the first terminal transmits data to the third terminal. The first terminal listens for the Sidelink Control Information (SCI) of the first transmission time slot where the COT collision occurred. In response to the SCI indicating that the second transmission time slot resource was not preempted after the COT collision ended, the first terminal, as the transmitting terminal in the second transmission time slot, uses the transmission opportunity indicated by the COT signal to transmit data to the third terminal.

[0072] Figure 6 This is an embodiment of a first terminal listening and responding to a resource conflict indicated by a COT (Content Override) signal. Due to resource overlap, a second terminal cancels data transmission to the first terminal during the COT collision time slot (first transmission time slot). The first terminal then transmits data to the third terminal during the subsequent COT transmission time slot (second transmission time slot). The first terminal listens for the Sidelink Control Information (SCI) of the first transmission time slot where the COT collision occurred. In response to the SCI indicating that the second transmission time slot resource was not preempted after the COT collision, the first terminal, as the transmitting terminal in the second transmission time slot, uses the transmission opportunity indicated by the COT signal to transmit data to the third terminal.

[0073] In another embodiment of the unlicensed sidelink channel sharing access method of this application, the collision occurs when the COT sent by the first terminal occurs, and the second terminal performs the listening and the response, for example... Figures 7-8 As shown.

[0074] Figure 7 This is an embodiment of a second terminal listening and responding to a resource conflict indicated by a first terminal's COT (Content Override) signal. Due to resource overlap, the second terminal cancels data transmission to the first terminal during the COT collision time slot (first transmission time slot). In the subsequent COT transmission time slot (second transmission time slot), the second terminal transmits data to the first terminal. The second terminal listens for the Sidelink Control Information (SCI) of the first transmission time slot where the COT collision occurred. In response to the SCI indicating that the second transmission time slot resource was not preempted after the COT collision ended, the sending terminal in the second transmission time slot is the second terminal, and it uses the transmission opportunity indicated by the COT signal to transmit data to the first terminal.

[0075] Figure 8 This embodiment describes an implementation where a first terminal indicates a resource conflict (COT) and a second terminal listens and responds. Due to resource overlap, the first terminal cancels data transmission to the third terminal during the COT collision time slot (first transmission time slot). The second terminal then transmits data to the first terminal during the subsequent COT transmission time slot (second transmission time slot). In this embodiment, the second and third terminals can be the same terminal or different terminals. The second terminal listens for the Sidelink Control Information (SCI) of the first transmission time slot where the COT collision occurred. In response to the SCI indicating that the second transmission time slot resource was not preempted after the COT collision, the sending terminal on the second transmission time slot is the second terminal, and it uses the transmission opportunity indicated by the COT to send transmission data to the first terminal.

[0076] Figure 9 An embodiment of listening and responding after a COT collision caused by half-duplex operation. When the COT1 of the first terminal (UE1) and the COT of the second terminal (UE2) collide in slot 3 due to a half-duplex problem of the third terminal (UE3), a COT2 interruption occurs. COT2 is located in the transmission slot after the COT collision slot 3, corresponding to the sending terminal UE2. UE2 listens for and detects the transmission in the COT collision slot. If it successfully detects SCI information (such as that sent by UE1), and this information does not indicate that the transmission opportunity corresponding to COT2 in slot 4 has been preempted, then in slot 4, UE2 uses the transmission opportunity corresponding to COT2 to access the channel and initiate data transmission based on the Type 2 LBT mechanism.

[0077] In the above embodiments of this application, the specific method for the transmitting terminal on the transmission time slot after the COT collision time slot to perform corresponding data transmission according to the data transmission status on the COT collision time slot is as follows: the transmitting terminal on the transmission time slot (second transmission time slot) after the COT collision listens to the transmission on the COT collision time slot (first transmission time slot). If SCI information is successfully detected on the COT collision time slot and the transmission opportunity on the transmission time slot after the COT collision time slot is not preempted by resources, the transmitting terminal continues to use the corresponding COT-indicated transmission opportunity on the transmission time slot for data transmission using the Type 2 LBT channel access mechanism after the COT collision time slot; otherwise, if the transmission opportunity on the transmission time slot after the COT collision time slot is preempted, the transmission opportunity is discarded; otherwise, if no relevant SCI information is detected, it falls back to Type 1 LBT to initiate channel access.

[0078] In one embodiment of this application, a COT collision occurs when a first terminal sends data to a second terminal in a first transmission time slot. The first terminal persists in sending data to the second terminal in the first transmission time slot to avoid COT interruption. For example, if the first terminal receives a COT collision indication caused by a device half-duplex problem, indicating that the first terminal sent an invalid transmission to the second or third terminal in the COT collision time slot, meaning that the second or third terminal needs to send data in the COT collision time slot, the first terminal can send data according to the COT indication in the COT collision time slot to avoid the COT interruption problem for the first terminal. The invalid transmission by the first terminal in the COT collision time slot can be retransmitted in a subsequent time slot.

[0079] The following is a technical solution for power control of the transmitting terminal in a COT collision. The general principle is that, in the time slot of a COT collision, when the transmitting terminal sends data to a certain terminal, it takes into account the line loss between the transmitting terminal and the receiving terminal in the first transmission time slot, and also the line loss between the transmitting terminal and the receiving terminal in the second transmission time slot. The transmitted power after power control is large enough so that the transmitting terminal in the second transmission time slot can receive the signal from the transmitting terminal in the first transmission time slot in the first transmission time slot.

[0080] Preferably, in a scenario where the second terminal cancels data transmission to the first terminal in the first transmission time slot due to a COT collision, and the first terminal transmits data to a certain terminal in the second transmission time slot (e.g.) Figure 6The second terminal sends data to the collision-free fourth terminal in the first transmission time slot. Power control is performed based on the larger of the first path loss and the second path loss, where the first path loss is the line loss between the first and second terminals, and the second path loss is the line loss between the second and fourth terminals. The purpose is to increase the probability that the first terminal can detect the data transmission of the second terminal in the COT collision time slot, thus avoiding the COT interruption problem for the first terminal. For example, if the transmission power of the second terminal in the COT collision time slot is P1, the target reception power is P2, the path loss between the second and first terminals is PL1, and the path loss between the second and fourth terminals is PL2, then P1 = P2 + max(PL1, PL2) + D, where D is the power control offset factor. If the sidelink is supported based on downlink path loss power control, assuming the downlink path loss between the second terminal and the base station is PLd1, then P1 = P2 + max(PL1, PL2, PLd1) + D.

[0081] Preferably, in a scenario where the first terminal cancels data transmission to a certain terminal due to a COT collision in the first transmission time slot, and the second terminal transmits data to the first terminal in the second transmission time slot (e.g.) Figure 8 The first terminal sends data to a collision-free fourth terminal in the first transmission time slot. Power control is performed based on the larger of the first path loss and the third path loss, where the first path loss is the line loss between the first and second terminals, and the third path loss is the line loss between the first and fourth terminals. This increases the probability that the second terminal can detect the data sent by the first terminal in the COT collision time slot, avoiding the COT interruption problem of the first terminal. For example, if the transmission power of the first terminal in the COT collision time slot is P3, the target reception power is P4, the path loss between the second and first terminals is PL1, and the path loss between the first and fourth terminals is PL3, then P3 = P4 + max(PL1, PL3) + D, where D is the power control offset factor. If sidelink-based power control based on downlink path loss is supported, assuming the downlink path loss between the first terminal and the base station is PLd2, then P3 = P4 + max(PL1, PL3, PLd2) + D.

[0082] Preferably, in a scenario where the first terminal sends data to the third terminal in the first transmission time slot, and the second terminal sends data to the first terminal in the second transmission time slot, the first terminal sends data to the third terminal in the first transmission time slot, and power control is performed based on the larger of a first path loss and a fourth path loss, where the first path loss is the line loss between the first terminal and the second terminal, and the fourth path loss is the line loss between the first terminal and the third terminal. The second terminal and the third terminal can be the same or different terminals.

[0083] For example, if the transmit power of the first terminal sending data to the third terminal in the transmission time slot indicated by COT is P5, the target receive power is P6, the path loss between the first and second terminals is PL1, and the path loss between the first and third terminals is PL4, then P5 = P6 + max(PL1, PL4) + D, where D is the power control offset factor. If the support side link is based on downlink path loss power control, assuming the downlink path loss between the first terminal and the base station is PLd2, then P5 = P6 + max(PL1, PL4, PLd2) + D.

[0084] The following is a technical solution for changing transmission time slots during a COT collision. Optionally, when a resource preemption causes a COT collision, the first terminal detects and receives signaling from other terminals that preempt a portion of the transmission time slots in the COT indicated by the first terminal, and the first terminal sends a second signaling to update the position of the transmission time slot corresponding to its COT indication.

[0085] In a further optimized embodiment of this application, the collision occurs when the COT sent by the first terminal occurs; when the first terminal performs the listening and the response, in response to the SCI indicating the transmission resources acquired by the first terminal in the first transmission time slot, the step of sending signaling through the transmission resources to update the transmission opportunities indicated by the COT so that at least a portion of them are located in the second transmission time slot includes: the first terminal sending signaling to update the transmission opportunities indicated by the COT and releasing the first transmission time slot. If the terminal that preempts the first transmission time slot is a second terminal sharing the COT of the first terminal, then the first terminal sends signaling to update the transmission opportunities indicated by the COT, including the transmission time slot occupied by the second terminal. See details. Figures 10-11 The example shown.

[0086] Figure 10 An example of how the first terminal changes the COT indication information due to a COT collision.

[0087] The first terminal detects a COT occupancy signaling message, indicating that the COT portion of the transmission time slot indicated by the first terminal has been preempted. If the first terminal obtains a transmission opportunity within the preempted COT time slot, it uses this opportunity to send a second signaling message to the third and second terminals corresponding to the COT indicated by the first terminal, in order to update the transmission time slot corresponding to the COT indicated by the first terminal. Figure 10 As shown, the first terminal COT corresponds to transmission time slots 1 to 6, of which transmission time slots 2 to 4 are preempted. The first terminal uses the transmission opportunity of transmission time slot 3 to send the second signaling to update the transmission time slots 5 to 6 corresponding to the COT.

[0088] Optionally, the first terminal can release the transmission resources corresponding to the original COT indication via a second signaling instruction. For example... Figure 10The first terminal has received an ACK feedback for its transmission in COT transmission slot 1 and needs to release subsequent transmission resources. The first terminal instructs the release of COT transmission slots 5-6 through the second signaling.

[0089] Figure 11 Another embodiment of the first terminal changing COT indication information due to COT collision.

[0090] Optionally, if the terminal that preempts the COT portion of the time slot indicated by the first terminal is a second terminal shared by the first terminal's COT, and the preempted transmission time slot is used for data transmission between the first terminal and the second terminal, then the first terminal sends a second signaling update to the COT, including the second signaling and the transmission time slot occupied by the second terminal.

[0091] For example Figure 11 As shown, the first terminal COT corresponds to transmission time slots 1 to 4, of which transmission time slots 2 to 6 are preempted. The first terminal uses the transmission opportunity of transmission time slot 3 to send the second signaling to update the transmission time slots 3 to 6 corresponding to the COT.

[0092] Figure 12 This is a schematic diagram of an embodiment of the terminal device.

[0093] This application also proposes a terminal device for implementing the method of any embodiment of this application, wherein the terminal device is used to implement the method described in any of the above embodiments of this application.

[0094] To implement the above technical solution, this application proposes a terminal device 20, which includes a transmitting module 21, a determining module 22, and a receiving module 23 that are interconnected.

[0095] The receiving module is used to listen for SCI.

[0096] The determining module is used to determine an idle time slot in the first transmission time slot and the second transmission time slot; it is also used to determine or update the transmission opportunity indicated by COT. In some embodiments of this application, the determining module is further used to determine one or more of the first path loss, the second path loss, the third path loss, and the fourth path loss, and to determine power control based on the above parameters. The power control steps are as described in the above embodiments.

[0097] The sending module is used to send signaling or transmit data.

[0098] The specific methods for implementing the functions of the sending module, determining module, and receiving module are as described in the various method embodiments of this application, and will not be repeated here.

[0099] The terminal equipment described in this application may refer to user equipment (UE), personal mobile terminal, smart terminal, mobile phone, computer with communication function, system providing services for the above-mentioned equipment, or any system, subsystem, module, circuit, chip or software running device that provides information reception, transmission, identification and processing for the above-mentioned equipment.

[0100] Figure 13 This is a block diagram of a terminal device according to another embodiment of the present invention. The terminal device 30 includes at least one processor 31, a memory 32, a user interface 33, and at least one network interface 34. The various components in the terminal device 30 are coupled together via a bus system. The bus system is used to enable communication between these components. The bus system includes a data bus, a power bus, a control bus, and a status signal bus.

[0101] User interface 33 may include a display, keyboard, or clicking device, such as a mouse, trackball, touchpad, or touchscreen.

[0102] The memory 32 stores executable modules or data structures. The memory may store the operating system and applications. The operating system includes various system programs, such as the framework layer, core library layer, and driver layer, used to implement various basic business functions and handle hardware-based tasks. The applications include various applications, such as media players and browsers, used to implement various application functions.

[0103] In an embodiment of the present invention, the memory 32 contains a computer program that executes any embodiment of the present application, the computer program being run on or modified by the processor 31.

[0104] The memory 32 contains a computer-readable storage medium. The processor 31 reads the information in the memory 32 and, in conjunction with its hardware, completes the steps of the above-described method. Specifically, the computer-readable storage medium stores a computer program, which, when executed by the processor 31, implements the steps of the method embodiments described in any of the above embodiments.

[0105] Processor 31 may be an integrated circuit chip with signal processing capabilities. In implementation, each step of the method in this application can be completed by the integrated logic circuitry in the hardware of processor 31 or by instructions in software form. The processor 31 may be a general-purpose processor, digital signal processor, application-specific integrated circuit, off-the-shelf programmable gate array or other programmable logic device, discrete gate or transistor logic device, or discrete hardware component. It can implement or execute the methods, steps, and logic block diagrams disclosed in the embodiments of this invention. The general-purpose processor may be a microprocessor or any conventional processor. The steps of the method disclosed in the embodiments of this invention can be directly manifested as execution by a hardware decoding processor, or execution by a combination of hardware and software modules in the decoding processor.

[0106] Those skilled in the art will understand that embodiments of the present invention can be provided as methods, systems, or computer program products. Therefore, the present invention can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. In a typical configuration, the device of this application includes one or more processors (CPUs), an input / output user interface, a network interface, and memory.

[0107] Furthermore, the present invention may take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0108] Therefore, this application also proposes a computer-readable medium storing a computer program that, when executed by a processor, implements the steps of the method described in any embodiment of this application. For example, the memory 32 of this invention may include non-permanent memory in a computer-readable medium, such as random access memory (RAM) and / or non-volatile memory, like read-only memory (ROM) or flash RAM.

[0109] It should also be noted that the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0110] It should also be noted that the terms "first," "second," "third," and "fourth" in this application are used to distinguish multiple objects with the same name and have no meaning of order or size.

[0111] The above description is merely an embodiment of this application and is not intended to limit the scope of this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of the claims of this application.

Claims

1. A method for unlicensed sidelink channel sharing access, characterized in that, Includes the following steps: Channel access is performed using the Type 2 LBT mechanism; Listen for the side link control information (SCI) of the first transmission time slot where a COT collision occurs; If the second transmission time slot resource indicated by the SCI after the COT collision is not preempted, transmission will be performed using the transmission opportunity indicated by the COT. If the second transmission slot resource is occupied after the SCI indicates that the COT collision has ended, the transmission opportunity on that resource is discarded.

2. A method for unlicensed sidelink channel sharing access, characterized in that, Includes the following steps: Channel access is performed using the Type 2 LBT mechanism; Listen for the side link control information (SCI) of the first transmission time slot where a COT collision occurs; In response to the fact that no SCI was detected in the first transmission slot where a COT collision occurred, the system switches to Type 1 LBT for channel sensing. In response to the SCI indicating that the first terminal has acquired transmission resources in the first transmission slot, signaling is sent through the transmission resources to update the transmission opportunities indicated by the COT so that at least a portion of them are located in the second transmission slot.

3. The unlicensed sidelink channel sharing access method as described in claim 1 or 2, characterized in that, The collision occurs when the COT sent by the first terminal occurs; the first terminal performs the listening and the response.

4. The unlicensed sidelink channel sharing access method as described in claim 1 or 2, characterized in that, The collision occurs when the COT sent by the first terminal occurs; the second terminal performs the listening and the response.

5. In the unlicensed sidelink channel sharing access method as described in claim 3, where the second terminal cancels sending data to the first terminal in the first transmission time slot due to a COT collision, and the first terminal sends data to a certain terminal in the second transmission time slot, the method is characterized in that... The second terminal sends data to the collision-free fourth terminal in the first transmission time slot and performs power control based on the larger of the first path loss and the second path loss, where the first path loss is the line loss between the first terminal and the second terminal, and the second path loss is the line loss between the second terminal and the fourth terminal.

6. In the scenario where the first terminal cancels data transmission to a certain terminal due to a COT collision in the first transmission time slot, and the second terminal transmits data to the first terminal in the second transmission time slot, the method as described in claim 4 is characterized in that... The first terminal sends data to the collision-free fourth terminal in the first transmission time slot and performs power control based on the larger of the first path loss and the third path loss, where the first path loss is the line loss between the first terminal and the second terminal, and the third path loss is the line loss between the first terminal and the fourth terminal.

7. The unlicensed sidelink channel sharing access method as described in claim 1 or 2, characterized in that, In a scenario where a first terminal sends data to a third terminal in a first transmission time slot, and the first terminal receives data sent by a second terminal in a second transmission time slot, the characteristic is that... The first terminal sends data to the third terminal in the first transmission time slot and performs power control based on the larger of the first path loss and the fourth path loss, where the first path loss is the line loss between the first terminal and the second terminal, and the fourth path loss is the line loss between the first terminal and the third terminal.

8. The unlicensed sidelink channel sharing access method as described in claim 1 or 2, characterized in that, A COT collision occurs when the first terminal sends data to the second terminal in the first transmission time slot. The first terminal continues to send data to the second terminal in the first transmission time slot to avoid COT interruption.

9. The unlicensed sidelink channel sharing access method as described in claim 3, in response to the SCI indicating idle resources in the first transmission time slot, sending signaling through the idle resources to update the transmission opportunities indicated by the COT so that at least a portion of them are located in the second transmission time slot, characterized in that, The first terminal sends a signaling message to update the transmission opportunity indicated by the COT and release the first transmission time slot.

10. The unlicensed sidelink channel sharing access method as described in claim 3, in response to the SCI indicating idle resources in the first transmission time slot, sending signaling through the idle resources to update the transmission opportunities indicated by the COT so that at least a portion of them are located in the second transmission time slot, characterized in that, The terminal that preempts the first transmission time slot is the second terminal shared by the first terminal's COT. The first terminal sends a signaling message to update the transmission opportunity indicated by the COT, including the transmission time slot occupied by the second terminal.

11. A computer-readable storage medium having a computer program stored thereon, characterized in that, When the program is executed by the processor, it implements the method as described in any one of claims 1 to 10.

12. A terminal device for implementing the method according to any one of claims 1 to 10, comprising a receiving module, a determining module, and a sending module; The receiving module is used to listen for SCI; The determining module is used to determine the idle time slots in the first transmission time slot and the second transmission time slot; it is also used to determine or update the transmission opportunities indicated by COT. The sending module is used to send signaling or transmit data.

13. A terminal device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that, When the processor executes the computer program, it implements the method as described in any one of claims 1 to 10.

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