Terminal access methods, devices, electronic equipment and media

Abstract

This application discloses a terminal access method, apparatus, electronic device, and medium. By applying the technical solution of this application, the LBT process for all sub-channels within the same resource selection window can be distributed among all SL terminals within the same group. This allows multiple SL terminals within the same group to coordinate LBT operations to preemptively seize the resource selection window and obtain sub-channel results, thereby significantly improving the preemption speed of SL terminals for resource selection window resources and reducing the additional latency caused by the instability of LBT results. Furthermore, it avoids the problem in related technologies where access channel compatibility between SL terminals and WIFI terminals cannot be guaranteed in Sidelink mode 2.

Description

Technical Field

[0001] This application relates to data processing technology, and in particular to a terminal access method, apparatus, electronic device, and medium. Background Technology

[0002] Radio access technology (RAT) deployed on unlicensed frequency bands is mainly WiFi terminals. WiFi uses a DCF channel access scheme based on CSMA / CA, which is a scheme based on channel contention.

[0003] LAA (licensed assisted access) and NR-U (new radio in unlicensed spectrum) employ the LBT (listen before talk) channel access scheme to ensure fair competition with other RATs such as Wi-Fi for unlicensed channels. Its basic principle is similar to CSMA / CA in Wi-Fi terminals. Before using a channel, it is necessary to check whether the channel is idle, and a backoff mechanism can be used to avoid collisions.

[0004] The LBT mechanism detects the channel using Clear Channel Assessment (CCA), which is based on energy detection (ED) to determine if other signals exist on the channel. If the average energy of the channel remains below a threshold, the channel is considered idle, and the base station can occupy it; otherwise, the channel is considered occupied, and the base station must wait until the channel becomes idle again.

[0005] Furthermore, in order to support more advanced V2X applications such as autonomous driving and direct terminal connections, and to alleviate the spectrum pressure on existing licensed spectrum, the 3GPP Release 18 project proposal clearly proposes to extend Sidelink communication to the FR1 unlicensed spectrum, enabling high-throughput, high-reliability, and low-latency direct connection services, and building direct connection services that meet different rates.

[0006] Since the Sidelink communication system needs to transmit information in both cellular and non-cellular coverage scenarios, resource allocation in Sidelink is divided into two types: one is where the base station allocates SL transmission resources to the terminal, called Sidelink Mode 1, where Mode 1 resource allocation only applies to scenarios where the terminal is within the base station's coverage area. The other is where the terminal autonomously selects transmission resources, called Sidelink Mode 2, which is applicable to scenarios both within and outside the base station's coverage area.

[0007] In addition, the LBT (listen before talk) channel access mechanism is widely used in NR-U technology because it can ensure fair coexistence among unlicensed band RATs. However, due to the uncertainty of LBT results, simply applying the LBT mechanism to Sidelink unlicensed access will bring additional high latency problems to Sidelink transmission.

[0008] In summary, for the Sidelink Mode 2 resource allocation mechanism, ensuring the access channel compatibility between SL terminals and WIFI terminals has become a problem that needs to be solved. Summary of the Invention

[0009] This application provides a terminal access method, apparatus, electronic device, and medium. It addresses the problem in related technologies where access channel compatibility between SL terminals and WIFI terminals cannot be guaranteed in Sidelink mode 2.

[0010] According to one aspect of the embodiments of this application, a terminal access method is provided, applied to an SL-side walkie-talkie terminal, comprising:

[0011] Before an SL terminal accesses a channel, it occupies at least one sub-channel under the target resource selection window based on the LBT protocol with multiple SL terminals belonging to the same group.

[0012] A successful occupancy message is broadcast to the WIFI terminal in the common control CCCH channel. The successful occupancy message is used to inform the WIFI terminal that the target resource selection window has been occupied by the SL terminal.

[0013] Based on Sidelink mode 2, access the channel under the target resource selection window.

[0014] Optionally, in another embodiment based on the method described above in this application, before the multiple SL terminals belonging to the same group occupy at least one sub-channel under the target resource selection window based on the LBT protocol, the method further includes:

[0015] Within the listening window, receive successful occupancy messages broadcast by other SL terminals in the CCCH channel. The successful occupancy messages include the resource selection window to be filtered and the reference signal reception power.

[0016] Based on the resource selection window to be screened and the reference signal reception power, it determines whether it is in the same group as the other SL terminals.

[0017] Optionally, in another embodiment based on the method described above in this application, determining whether it is in the same group as the other SL terminals based on the selection window for the resource to be screened and the reference signal received power includes:

[0018] If the selection window for the resource to be screened is determined to be the target resource selection window; and if the reference signal received power is determined to be greater than the first preset power value, then it is determined that it is in the same group as the other SL terminals.

[0019] Optionally, in another embodiment based on the method described above in this application, after the multiple SL terminals belonging to the same group occupy at least one sub-channel under the target resource selection window based on the LBT protocol, the method further includes:

[0020] In the CCCH channel, a successful occupancy message is sent to other SL terminals within the same packet.

[0021] Optionally, in another embodiment based on the method described above in this application, after the multiple SL terminals belonging to the same group occupy at least one sub-channel under the target resource selection window based on the LBT protocol, the method further includes:

[0022] If it is determined that the number of sub-channels occupied by itself based on the LBT protocol is greater than a first value, and if it is determined that the number of sub-channels occupied by all SL terminals in the same group based on the LBT protocol is greater than a second value, the second value is greater than the first value.

[0023] The system confirms successful acquisition of the target resource selection window and broadcasts a successful acquisition message to the WIFI terminal in the Common Control Channel (CCCH).

[0024] Optionally, in another embodiment based on the method described above in this application, after the multiple SL terminals belonging to the same group occupy at least one sub-channel under the target resource selection window based on the LBT protocol, the method further includes:

[0025] If it is determined that the number of sub-channels occupied by all SL terminals in the same group based on the LBT protocol is less than or equal to the second value, it is determined that the target resource selection window has not been successfully occupied.

[0026] Multiple SL terminals belonging to the same group occupy at least one sub-channel under other resource selection windows based on the LBT protocol.

[0027] According to one aspect of the embodiments of this application, a terminal access method is provided, applied to a WIFI terminal, comprising:

[0028] The successful occupation message broadcast by the SL terminal on the CCCH channel is detected. The successful occupation message is used to inform the WIFI terminal that the target resource selection window has been occupied by the SL terminal.

[0029] The sub-channels under the target resource selection window are not occupied, and the CCCH channel is continued to be monitored;

[0030] When the SL terminal detects the resource selection message broadcast on the CCCH channel, it occupies the sub-channels that are not occupied by the SL terminal under the target resource selection window;

[0031] Access a sub-channel that is not occupied by the SL terminal.

[0032] Optionally, in another embodiment based on the method described above in this application, after the successful occupancy message broadcast by the SL terminal on the CCCH channel is detected, the method further includes:

[0033] Detect whether the received power of the reference signal of the CCCH channel broadcast by the SL terminal is greater than a second preset power value;

[0034] If the value is greater than the target resource selection window, the sub-channel under the target resource selection window will not be occupied, and the CCCH channel will continue to be monitored.

[0035] If it is not greater than, it will compete with the SL terminal for the sub-channel under the target resource selection window.

[0036] Optionally, in another embodiment based on the method described above in this application, the step of occupying a sub-channel not occupied by the SL terminal under the target resource selection window after the SL terminal has received a resource selection message broadcast on the CCCH channel includes:

[0037] From the resource selection message, determine the sub-channels that have been occupied by the SL terminal under the target resource selection window;

[0038] Based on the sub-channels already occupied by the SL terminal, determine the sub-channels not occupied by the SL terminal under the target resource selection window.

[0039] According to another aspect of the embodiments of this application, an access device for a terminal is provided, characterized in that it is applied to an SL-side link terminal and includes:

[0040] The first occupancy module is configured to occupy at least one sub-channel under the target resource selection window with multiple SL terminals belonging to the same group based on the LBT protocol before the SL terminal accesses the channel.

[0041] The broadcast module is configured to broadcast a successful occupancy message to the WIFI terminal in the common control CCCH channel. The successful occupancy message is used to inform the WIFI terminal that the target resource selection window has been occupied by the SL terminal.

[0042] The first access module is configured to access the channel under the target resource selection window based on Sidelink mode 2.

[0043] According to another aspect of the embodiments of this application, a terminal access device is provided, characterized in that it is applied to a WIFI terminal and includes:

[0044] The monitoring module is configured to monitor the successful occupation message broadcast by the SL terminal on the CCCH channel. The successful occupation message is used to inform the WIFI terminal that the target resource selection window has been occupied by the SL terminal.

[0045] The monitoring module is configured not to occupy the sub-channels under the target resource selection window, and to continue monitoring the CCCH channel;

[0046] The second occupancy module is configured to occupy a sub-channel not occupied by the SL terminal under the target resource selection window after listening to the resource selection message broadcast by the SL terminal on the CCCH channel;

[0047] The second access module is configured to access a sub-channel that is not occupied by the SL terminal.

[0048] According to another aspect of the embodiments of this application, an electronic device is provided, comprising:

[0049] Memory, used to store executable instructions; and

[0050] A processor, configured to execute the executable instructions with the memory to perform the operation of any of the aforementioned terminal access methods.

[0051] According to another aspect of the embodiments of this application, a computer-readable storage medium is provided for storing computer-readable instructions, which, when executed, perform the operation of the access method of any of the above-described terminals.

[0052] In this application, before an SL terminal accesses a channel, it can occupy at least one sub-channel within a target resource selection window based on the LBT protocol with multiple SL terminals belonging to the same group. A successful occupancy message is broadcast to the WIFI terminal in the common control CCCH channel, informing the WIFI terminal that the target resource selection window has been occupied by the SL terminal. Then, based on Sidelink mode 2, it accesses the channel within the target resource selection window. By applying the technical solution of this application, the LBT process for all sub-channels within the same resource selection window can be distributed among all SL terminals in the same group, enabling multiple SL terminals in the same group to coordinate LBT operations to preemptively occupy the resource selection window and obtain sub-channels. This significantly improves the SL terminal's preemption speed for resource selection window resources, thus reducing the additional latency caused by the instability of LBT results. Furthermore, it avoids the problem in related technologies where the access channel compatibility between SL terminals and WIFI terminals cannot be guaranteed under Sidelink mode 2.

[0053] The technical solution of this application will be further described in detail below with reference to the accompanying drawings and embodiments. Attached Figure Description

[0054] The accompanying drawings, which form part of this specification, illustrate embodiments of this application and, together with the description, serve to explain the principles of this application.

[0055] This application can be more clearly understood with reference to the accompanying drawings and the following detailed description, wherein:

[0056] Figure 1 This is a schematic diagram of a terminal access method proposed in this application;

[0057] Figure 2 This is a schematic diagram illustrating the resource usage of an SL terminal as proposed in this application;

[0058] Figure 3 This is a schematic diagram illustrating the resource usage of another SL terminal proposed in this application;

[0059] Figure 4 This is a schematic diagram of the overall process of the access method proposed in this application for SL terminals and WIFI terminals;

[0060] Figure 5 This is a schematic diagram of another terminal access method proposed in this application;

[0061] Figure 6 This is a schematic diagram of a WIFI terminal access method proposed in this application;

[0062] Figures 7-8 This is a schematic diagram of the structure of a terminal access device proposed in this application;

[0063] Figure 9 This is a schematic diagram of the structure of an electronic device proposed in this application. Detailed Implementation

[0064] Various exemplary embodiments of the present application will now be described in detail with reference to the accompanying drawings. It should be noted that, unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps set forth in these embodiments do not limit the scope of the present application.

[0065] At the same time, it should be understood that, for ease of description, the dimensions of the various parts shown in the accompanying drawings are not drawn according to actual scale.

[0066] The following description of at least one exemplary embodiment is merely illustrative and is not intended to limit the scope of this application or its application or use.

[0067] Techniques, methods, and equipment known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and equipment should be considered part of the specification.

[0068] It should be noted that similar labels and letters in the following figures indicate similar items; therefore, once an item is defined in one figure, it does not need to be discussed further in subsequent figures.

[0069] Furthermore, the technical solutions of the various embodiments of this application can be combined with each other, but only if they are based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed by this application.

[0070] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in the embodiments of this application are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0071] The following is combined Figures 1-5 This application describes a terminal access method according to exemplary embodiments thereof. It should be noted that the following application scenarios are shown only to facilitate understanding of the spirit and principles of this application, and the embodiments of this application are not limited in any way. Rather, the embodiments of this application can be applied to any applicable scenario.

[0072] This application also proposes a terminal access method, device, electronic device, and medium.

[0073] Figure 1 A schematic flowchart illustrating an access method for a terminal according to an embodiment of this application is shown. Figure 1 As shown, this method is applied to the SL-side link terminal and includes:

[0074] S101, Before the SL terminal accesses the channel, it occupies at least one sub-channel under the target resource selection window based on the LBT protocol with multiple SL terminals belonging to the same group.

[0075] S102, broadcast a successful occupancy message to the WIFI terminal in the common control CCCH channel. The successful occupancy message is used to inform the WIFI terminal that the target resource selection window has been occupied by the SL terminal.

[0076] S103, based on Sidelink mode 2, accesses the channel under the target resource selection window.

[0077] In related technologies, unlicensed frequency band access technologies include two modes of resource allocation mechanisms. Unlike traditional cellular systems where UEs and the network transmit data via uplink or downlink, Sidelink terminals (i.e., SL terminals) interact directly through the sidelink (SL).

[0078] Since the Sidelink communication system needs to transmit information in both scenarios with and without cellular signal coverage, resource allocation in Sidelink is divided into the following two types:

[0079] Sidelink Mode 1:

[0080] Sidelink Mode 1 is a transmission resource allocation method where the base station allocates SL (Single Link) transmission resources to the terminal. Specifically, Mode 1 resource allocation is only applicable when the terminal is within the base station's coverage area.

[0081] Sidelink Mode 2:

[0082] Sidelink Mode 2 is a mode where the terminal autonomously selects transmission resources. Specifically, Mode 2 is applicable to scenarios both within and outside the base station's coverage area.

[0083] As an example, the resource allocation process for SL terminals in Sidelink Mode 2 is as follows: Figure 2 As shown in the diagram. It is assumed that the data packet from the SL terminal arrives in time slot n, triggering resource selection.

[0084] Specifically, during the Resource Selection Window (RSW) process, it starts at n+T1 and ends at n+T2. Additionally, the SL terminal operates from n-T0 to nT... proc,0 Perform resource monitoring. T0 takes the value of 100ms or 1100ms. When the subcarrier spacing is 15kHz, 30kHz, 60kHz, or 120kHz, T... proc,0 They are 1, 2, 4, and 8 time slots respectively.

[0085] If the SL terminal detects a PSCCH (physical sidelink control channel) within the listening window, it measures the RSRP (reference signal received power) of that PSCCH or the RSRP of the PSSCH (physical sidelink shared channel) scheduled by that PSCCH.

[0086] Furthermore, when the SL terminal determines that the monitored RSRP is greater than the preset SL-RSRP threshold, and determines that the reserved resource is located within a specific resource selection window based on the resource reservation information in the sideline control information transmitted on the PSCCH, then the corresponding resource is excluded from the candidate resource set. Until nT proc,0 At any given time, the UE determines the final set of candidate resources and randomly selects its own resource blocks from it for subsequent transmission.

[0087] However, the following problems exist in the process of SL terminals using Sidelink mode 2 to occupy resources, as mentioned in the relevant technologies:

[0088] like Figure 3 As shown, in Sidelink mode 2, the time between the end of the SL terminal's listening window and the start of the resource selection window is at least (T). proc,0 The latency is +T1), while other terminals under RATs (such as WiFi terminals) use CSMA / CA and LBT mechanisms to compete for the channel based on energy detection (ED) and have "timeliness", that is, the WiFi terminal immediately accesses the channel once it successfully competes for the resource.

[0089] Therefore, in time slot nT proc,0During the period ~n+T1, since data transmission from the SL terminal has not yet started, the WiFi terminal may successfully compete for the channel and preempt the reserved resources finally determined by the SL terminal during the listening window phase, thus causing a resource selection conflict. In one embodiment, since the WiFi terminal may access and occupy all channels under the resource selection window, the channel preemption of one WiFi terminal may cause resource selection conflicts for multiple SL terminals.

[0090] Furthermore, to support more advanced V2X applications such as autonomous driving and direct terminal connections, and to alleviate spectrum pressure on existing licensed spectrum, the 3GPP Release 18 project proposal explicitly proposes extending Sidelink communication to the FR1 unlicensed spectrum to enable high-throughput, high-reliability, and low-latency direct connection services, building direct connection services that meet different speed requirements. This includes unlicensed access mechanisms and COT sharing between terminals. At the RAN TSGR94e meeting, various companies had a heated discussion on Sidelink's unlicensed access mechanism and reached the following consensus:

[0091] The LBT channel access mechanism is widely used in NR-U technology because it can guarantee fair coexistence among unlicensed band RATs. However, due to the uncertainty of LBT results, simply applying the LBT mechanism to Sidelink unlicensed access will introduce additional high latency issues to Sidelink transmission.

[0092] In addition, for the SL mode 2 resource allocation mechanism, the terminal can "reserve" resources in advance, which is incompatible with the "timeliness" of the unlicensed LBT mechanism. Therefore, how to ensure low latency while being compatible with SL mode 2 transmission has become one of the key points in the research of the SL mode 2 unlicensed access mechanism.

[0093] Based on the foregoing, this application proposes a Sidelink Mode 2 unlicensed access mechanism based on the terminal cooperation LBT (listen before talk) protocol to enable channel access for both SL terminals and Wi-Fi terminals. Understandably, this method is compatible with the resource allocation and NR-U channel access characteristics of Sidelink Mode 2, thereby enabling Sidelink terminals and Wi-Fi terminals to coexist amicably on the unlicensed spectrum and reducing the additional latency introduced by LBT.

[0094] In this embodiment of the application, before the SL terminal accesses the channel, it needs to occupy at least one sub-channel under the target resource selection window based on the LBT protocol with multiple SL terminals belonging to the same group.

[0095] In this context, SL terminals within the same group represent a set of SL terminals that use the same RSW configuration (i.e., use the same resource selection window) and are physically adjacent. Different SL terminals within the same group compete for LBT (Local Level-Blocking) on ​​all sub-channels within the same RSW block. When the total number of successfully LBTed sub-channels exceeds a certain threshold (i.e., the second value), it is considered a successful LBT (i.e., successfully occupying a sub-channel under the target resource selection window based on the LBT protocol). All SL terminals within this group can then broadcast a successful occupation message on the Common Control Channel (CCCH) to preemptively occupy RSW resources and enter the listening phase in the normal SL Mode 2.

[0096] The condition for two SL terminals to be considered to be physically adjacent is: the reference signal received power (i.e., CCCH RSRP) of other SL terminals in the CCCH channel that one SL terminal listens to is greater than a certain preset power value, and the reference signal received power (i.e., PSCCH RSRP) of other SL terminals that it listens to is also greater than a certain preset power value.

[0097] like Figure 4 As shown, taking Cat-4 LBT as an example, an SL terminal can perform the following steps to access an unlicensed channel:

[0098] Step 1: The SL terminal obtains the target resource selection window (RSW) information through the gNB base station or network pre-configuration information;

[0099] Step 2: For example, if the data packet of the SL terminal arrives in time slot n, the duration of the RSW is time slot n, the duration of the listening window is time slot n, the SL terminal starts to perform LBT process on all sub-channels of the RSW from time slot n, and at the same time, the counter starts to count, and the counter increments by one whenever a sub-channel LBT is successful.

[0100] The LBT phase lasts at most until time slot n-T4 (as an example, the values ​​of T3 and T4 are configurable based on the access level of the SL terminal, and T3>T0>T4>T). proc,0 The SL terminal is considered to have successfully competed for the target resource selection window (i.e., successfully occupied the target resource selection window). At this time, all SL terminals in the same group can immediately broadcast a successful occupation message on the CCCH channel (this successful occupation message can be control signaling CCI-A (CCCH Control Information-A, type A common channel control information).

[0101] As an example, the successful occupancy message includes: the time-frequency domain information of the RSW and the time-frequency domain information of the sub-channel where the LBT was successfully established. It should be noted that the conditions for the SL terminal to successfully occupy the target resource selection window for its packet are as follows:

[0102] ① The value of the counter is greater than or equal to the threshold K1 (that is, it is determined that the number of sub-channels occupied by itself based on the LBT protocol is greater than the first value);

[0103] ② Parse the sub-channel information of other SL terminals within the group that have successfully performed LBT from the CCCH channel. The total number of sub-channels with successful LBT is greater than or equal to the threshold K2 (i.e., the number of sub-channels occupied by all SL terminals in the same group based on the LBT protocol is greater than the second value). It should be noted that if multiple SLs in the same group successfully perform LBT on the same sub-channel, that sub-channel is only recorded once.

[0104] Understandably, if the above conditions are not met, it indicates that the target resource selection window of the group in which the SL terminal is located has failed, and it is necessary to return to step 2 to continue competing for resources in the next resource selection window.

[0105] Step 3: The WiFi terminal listens for successful occupancy messages in the CCCH channel and performs interference measurement. If the corresponding RSRP is higher than a predetermined second preset power value, the WiFi terminal is marked as a "Limited WiFi UE" (LWU). This Limited WiFi UE indicates that it will continue to listen for successful occupancy messages in the CCCH channel and will cease competing for the target resource selection window resource indicated by the successful occupancy message.

[0106] In another approach, if the corresponding RSRP is not higher than a predetermined second preset power value, the WiFi terminal is marked as a "Free WiFi UE". This "Free WiFi UE" indicates that it does not need to decode the successful occupancy message in the CCCH it has been listening to, and its channel contention behavior is unaffected.

[0107] Step 4: The SL terminal performs the listening process in the mode 2 resource allocation mechanism on all sub-channels in the target resource selection window to determine the final candidate resource set, and then randomly selects its reserved resources from the candidate resource set to carry the subsequent data transmission.

[0108] Step 5: The SL terminal transmits Sidelink Control Information (SCI) in the PSCCH channel, where the SCI points to the scheduled resource.

[0109] Step 6, SL terminal in nTproc，0 Resource selection messages are constantly transmitted on the CCCH channel (for example, the resource selection message can be CCI-B (CCCH Control Information-B, Type B Common Channel Control Information). This resource selection message contains the sub-channels that have been occupied by the SL terminal under the target resource selection window.

[0110] Step 7: The WIFI terminal continues to listen to the CCCH channel and decodes the resource selection message to determine the sub-channels not occupied by the SL terminal under the target resource selection window based on the sub-channels already occupied by the SL terminal, and continues to compete for the unoccupied resources in the RSW.

[0111] Step 8: The SL terminal transmits data in the reserved channel.

[0112] In this application, before an SL terminal accesses a channel, it can occupy at least one sub-channel within a target resource selection window based on the LBT protocol with multiple SL terminals belonging to the same group. A successful occupancy message is broadcast to the WIFI terminal in the common control CCCH channel, informing the WIFI terminal that the target resource selection window has been occupied by the SL terminal. Then, based on Sidelink mode 2, it accesses the channel within the target resource selection window. By applying the technical solution of this application, the LBT process for all sub-channels within the same resource selection window can be distributed among all SL terminals in the same group, enabling multiple SL terminals in the same group to coordinate LBT operations to preemptively occupy the resource selection window and obtain sub-channels. This significantly improves the SL terminal's preemption speed for resource selection window resources, thus reducing the additional latency caused by the instability of LBT results. Furthermore, it avoids the problem in related technologies where the access channel compatibility between SL terminals and WIFI terminals cannot be guaranteed under Sidelink mode 2.

[0113] Optionally, in another embodiment based on the method described above in this application, before occupying at least one sub-channel under the target resource selection window based on the LBT protocol with multiple SL terminals belonging to the same group, the method further includes:

[0114] Within the listening window, receive successful occupancy messages broadcast by other SL terminals in the CCCH channel. The successful occupancy message includes the selection window for the resource to be filtered and the reference signal received power.

[0115] Based on the selection window for the resources to be filtered and the reference signal reception power, determine whether it is in the same group as other SL terminals.

[0116] Optionally, in another embodiment based on the method described above in this application, determining whether it is in the same group as other SL terminals based on the selection window for the resource to be screened and the reference signal received power includes:

[0117] If the selection window for the resource to be filtered is determined to be the target resource selection window; and if the reference signal received power is determined to be greater than the first preset power value, then it is determined that it and other SL terminals are in the same group.

[0118] Understandably, in this embodiment, the LBT process for all sub-channels within the target resource selection window needs to be distributed among all SL terminals within the same group (i.e., multiple SL terminals within the same group cooperate to preempt multiple or all sub-channels under the target resource selection window based on the LBT protocol). By coordinating the LBT process among SL terminals within the group, the preemption speed of SL terminals for resource selection window resources is significantly improved, thus greatly reducing the additional latency caused by the instability of LBT results.

[0119] Optionally, in another embodiment based on the method described above in this application, after multiple SL terminals belonging to the same group occupy at least one sub-channel under the target resource selection window based on the LBT protocol, the method further includes:

[0120] In the CCCH channel, a successful occupancy message is sent to other SL terminals within the same packet.

[0121] Optionally, in another embodiment based on the method described above in this application, after multiple SL terminals belonging to the same group occupy at least one sub-channel under the target resource selection window based on the LBT protocol, the method further includes:

[0122] If it is determined that the number of sub-channels occupied by itself based on the LBT protocol is greater than the first value, and if it is determined that the number of sub-channels occupied by all SL terminals in the same group based on the LBT protocol is greater than the second value, the second value is greater than the first value.

[0123] The system successfully identifies the target resource selection window and broadcasts a successful acquisition message to the WIFI terminal in the common control CCCH channel.

[0124] Optionally, in another embodiment based on the method described above in this application, after multiple SL terminals belonging to the same group occupy at least one sub-channel under the target resource selection window based on the LBT protocol, the method further includes:

[0125] If it is determined that the number of sub-channels occupied by all SL terminals in the same group based on the LBT protocol is less than or equal to the second value, it is determined that the target resource selection window has not been successfully occupied.

[0126] Multiple SL terminals belonging to the same group occupy at least one sub-channel under other resource selection windows based on the LBT protocol.

[0127] In this embodiment, by implementing preemptive LBT for RSW resources by the SL terminal and silencing channel contention among nearby WiFi terminals within the resource selection window, resource selection conflicts with WiFi are avoided, thus achieving friendly coexistence between Sidelink and WiFi on unlicensed frequency bands. It also achieves a feature that is compatible with both the "immediacy" of the unlicensed LBT mechanism and the "reservation" of the SL Mode 2 resource allocation mechanism.

[0128] Figure 5 A schematic flowchart illustrating an access method for a terminal according to an embodiment of this application is shown. Figure 5 As shown, this method is applied to a WIFI terminal, including:

[0129] S201, The successful occupation message broadcast by the SL terminal on the CCCH channel was detected. The successful occupation message is used to inform the WIFI terminal that the target resource selection window has been occupied by the SL terminal.

[0130] S202, do not occupy the sub-channels under the target resource selection window, and continue to listen to the CCCH channel.

[0131] S203: When the resource selection message broadcast by the SL terminal on the CCCH channel is detected, the sub-channel that is not occupied by the SL terminal under the target resource selection window is occupied.

[0132] S204, access a sub-channel not occupied by an SL terminal.

[0133] In the embodiments of this application, such as Figure 6 As shown, for the WiFi terminal access method, after the SL terminal broadcasts a successful occupancy message to the WiFi terminal in the common control channel (CCCH), the WiFi terminal listens for the successful occupancy message in the CCCH channel and performs interference measurement. If the corresponding RSRP is higher than a predetermined second preset power value, the WiFi terminal is marked as a "Limited WiFi UE" (LWU). This Limited WiFi UE is used to indicate that it will continue to listen for the successful occupancy message in the CCCH channel and will cease competing for the target resource selection window resource indicated by the successful occupancy message.

[0134] In another approach, if the corresponding RSRP is not higher than a predetermined second preset power value, the WiFi terminal is marked as a "Free WiFi UE". This "Free WiFi UE" indicates that it does not need to decode the successful occupancy message in the CCCH it has been listening to, and its channel contention behavior is unaffected.

[0135] Furthermore, the SL terminal performs a listening process in the mode 2 resource allocation mechanism on all sub-channels in the target resource selection window to determine the final candidate resource set. Then, it broadcasts a resource selection message on the CCCH channel (for example, this resource selection message can be CCI-B (CCCH Control Information-B, Type B Common Channel Control Information)). This resource selection message contains the sub-channels that have been occupied by the SL terminal under the target resource selection window.

[0136] In one approach, after a Wi-Fi terminal listens to a resource selection message broadcast on the CCCH channel, it decodes the resource selection message to determine the sub-channels not occupied by the SL terminal under the target resource selection window based on the sub-channels already occupied by the SL terminal carried in the message. The terminal then continues to compete for the unoccupied resources in the target resource selection window and subsequently transmits data based on the channels it has successfully occupied.

[0137] In this application, before an SL terminal accesses a channel, it can occupy at least one sub-channel within a target resource selection window based on the LBT protocol with multiple SL terminals belonging to the same group. A successful occupancy message is broadcast to the WIFI terminal in the common control CCCH channel, informing the WIFI terminal that the target resource selection window has been occupied by the SL terminal. Then, based on Sidelink mode 2, it accesses the channel within the target resource selection window. By applying the technical solution of this application, the LBT process for all sub-channels within the same resource selection window can be distributed among all SL terminals in the same group, enabling multiple SL terminals in the same group to coordinate LBT operations to preemptively occupy the resource selection window and obtain sub-channels. This significantly improves the SL terminal's preemption speed for resource selection window resources, thus reducing the additional latency caused by the instability of LBT results. Furthermore, it avoids the problem in related technologies where the access channel compatibility between SL terminals and WIFI terminals cannot be guaranteed under Sidelink mode 2.

[0138] Optionally, in another embodiment based on the method described above in this application, after detecting the successful occupancy message broadcast by the SL terminal on the CCCH channel, the method further includes:

[0139] Detect whether the received power of the reference signal of the CCCH channel broadcast by the SL terminal is greater than the second preset power value;

[0140] If the value is greater than the target resource selection window, the sub-channels under the target resource selection window will not be occupied, and the CCCH channel will continue to be monitored.

[0141] If it is not greater than, it will compete with the SL terminal for the sub-channel under the target resource selection window.

[0142] Optionally, in another embodiment based on the method described above in this application, after detecting the resource selection message broadcast by the SL terminal on the CCCH channel, occupying a sub-channel not occupied by the SL terminal under the target resource selection window includes:

[0143] From the resource selection message, determine the sub-channels that have been occupied by the SL terminal under the target resource selection window;

[0144] Based on the sub-channels already occupied by SL terminals, determine the sub-channels not occupied by SL terminals under the target resource selection window.

[0145] Optionally, in another embodiment of this application, such as Figure 7 As shown, this application also provides an access device for a terminal. Applied to an SL-side walkie-talkie terminal, it includes:

[0146] The first occupancy module 301 is configured to occupy at least one sub-channel under the target resource selection window based on the LBT protocol with multiple SL terminals belonging to the same group before the SL terminal accesses the channel.

[0147] Broadcast module 302 is configured to broadcast a successful occupancy message to the WIFI terminal in the common control CCCH channel. The successful occupancy message is used to inform the WIFI terminal that the target resource selection window has been occupied by the SL terminal.

[0148] The first access module 303 is configured to access the channel under the target resource selection window based on Sidelink mode 2.

[0149] In another embodiment of this application, the steps configured to be executed by the first occupying module 301 include:

[0150] Within the listening window, receive successful occupancy messages broadcast by other SL terminals in the CCCH channel. The successful occupancy messages include the resource selection window to be filtered and the reference signal reception power.

[0151] Based on the resource selection window to be screened and the reference signal reception power, it determines whether it is in the same group as the other SL terminals.

[0152] In another embodiment of this application, the steps configured to be executed by the first occupying module 301 include:

[0153] If the selection window for the resource to be screened is determined to be the target resource selection window; and if the reference signal received power is determined to be greater than the first preset power value, then it is determined that it is in the same group as the other SL terminals.

[0154] In another embodiment of this application, the steps configured to be executed by the first occupying module 301 include:

[0155] In the CCCH channel, a successful occupancy message is sent to other SL terminals within the same packet.

[0156] In another embodiment of this application, the steps configured to be executed by the first occupying module 301 include:

[0157] If it is determined that the number of sub-channels occupied by itself based on the LBT protocol is greater than a first value, and if it is determined that the number of sub-channels occupied by all SL terminals in the same group based on the LBT protocol is greater than a second value, the second value is greater than the first value.

[0158] The system confirms successful acquisition of the target resource selection window and broadcasts a successful acquisition message to the WIFI terminal in the Common Control Channel (CCCH).

[0159] In another embodiment of this application, the steps configured to be executed by the first occupying module 301 include:

[0160] If it is determined that the number of sub-channels occupied by all SL terminals in the same group based on the LBT protocol is less than or equal to the second value, it is determined that the target resource selection window has not been successfully occupied.

[0161] Multiple SL terminals belonging to the same group occupy at least one sub-channel under other resource selection windows based on the LBT protocol.

[0162] Optionally, in another embodiment of this application, such as Figure 8 As shown, this application also provides an access device for a terminal. Applied to a WIFI terminal, it includes:

[0163] The monitoring module 304 is configured to monitor the successful occupation message broadcast by the SL terminal on the CCCH channel. The successful occupation message is used to inform the WIFI terminal that the target resource selection window has been occupied by the SL terminal.

[0164] The monitoring module 304 is configured not to occupy the sub-channels under the target resource selection window, and to continue monitoring the CCCH channel;

[0165] The second occupancy module 305 is configured to occupy a sub-channel not occupied by the SL terminal under the target resource selection window after listening to the resource selection message broadcast by the SL terminal on the CCCH channel.

[0166] The second access module 306 is configured to access a sub-channel that is not occupied by the SL terminal.

[0167] In another embodiment of this application, the listening module 304 is configured to perform the following steps:

[0168] Detect whether the received power of the reference signal of the CCCH channel broadcast by the SL terminal is greater than a second preset power value;

[0169] If the value is greater than the target resource selection window, the sub-channel under the target resource selection window will not be occupied, and the CCCH channel will continue to be monitored.

[0170] If it is not greater than, it will compete with the SL terminal for the sub-channel under the target resource selection window.

[0171] In another embodiment of this application, the listening module 304 is configured to perform the following steps:

[0172] From the resource selection message, determine the sub-channels that have been occupied by the SL terminal under the target resource selection window;

[0173] Based on the sub-channels already occupied by the SL terminal, determine the sub-channels not occupied by the SL terminal under the target resource selection window.

[0174] Figure 9 This is a logical structure block diagram of an electronic device according to an exemplary embodiment. For example, the electronic device 400 may be a mobile phone, computer, digital broadcasting terminal, messaging device, game console, tablet device, medical device, vehicle device, personal digital assistant, etc.

[0175] In an exemplary embodiment, a non-transitory computer-readable storage medium including instructions is also provided, such as a memory including instructions. These instructions can be executed by a processor of an electronic device to complete the terminal access method described above. The method includes: before an SL terminal accesses a channel, occupying at least one sub-channel under a target resource selection window with multiple SL terminals belonging to the same group based on the LBT protocol; broadcasting a successful occupancy message to a WIFI terminal in a common control CCCH channel, the successful occupancy message informing the WIFI terminal that the target resource selection window has been occupied by an SL terminal; and accessing the channel under the target resource selection window based on Sidelink mode 2. Optionally, the instructions can also be executed by a processor of an electronic device to complete other steps involved in the exemplary embodiment described above. For example, the non-transitory computer-readable storage medium can be a ROM, random access memory (RAM), CD-ROM, magnetic tape, floppy disk, and optical data storage device, etc.

[0176] In an exemplary embodiment, an application / computer program product is also provided, including one or more instructions that can be executed by a processor of an electronic device to complete the aforementioned terminal access method. The method includes: before an SL terminal accesses a channel, occupying at least one sub-channel under a target resource selection window with multiple SL terminals belonging to the same group based on the LBT protocol; broadcasting a successful occupancy message to a WIFI terminal in the Common Control Channel (CCCH), the successful occupancy message informing the WIFI terminal that the target resource selection window has been occupied by an SL terminal; and accessing the channel under the target resource selection window based on Sidelink Mode 2. Optionally, the above instructions can also be executed by a processor of an electronic device to complete other steps involved in the above exemplary embodiment.

[0177] Figure 9 This is an example diagram of an electronic device 400. Those skilled in the art will understand that it is illustrative. Figure 9 This is merely an example of electronic device 400 and does not constitute a limitation on electronic device 400. It may include more or fewer components than shown, or combine certain components, or different components. For example, electronic device 400 may also include input / output devices, network access devices, buses, etc.

[0178] The processor 402 can be a Central Processing Unit (CPU), or other general-purpose processors, digital signal processors (DSPs), application-specific integrated circuits (ASICs), field-programmable gate arrays (FPGAs), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. The general-purpose processor can be a microprocessor, or processor 402 can be any conventional processor. Processor 402 is the control center of electronic device 400, connecting all parts of electronic device 400 via various interfaces and lines.

[0179] The memory 401 can be used to store computer-readable instructions 303. The processor 402 implements various functions of the electronic device 400 by running or executing the computer-readable instructions or modules stored in the memory 401 and calling the data stored in the memory 401. The memory 401 may mainly include a program storage area and a data storage area. The program storage area may store the operating system, application programs required for at least one function (such as sound playback function, image playback function, etc.), etc.; the data storage area may store data created according to the use of the electronic device 400, etc. In addition, the memory 401 may include a hard disk, memory, plug-in hard disk, smart media card (SMC), secure digital (SD) card, flash card, at least one disk storage device, flash memory device, read-only memory (ROM), random access memory (RAM), or other non-volatile / volatile storage devices.

[0180] If the modules integrated in the electronic device 400 are implemented as software functional modules and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, all or part of the processes in the methods of the above embodiments of the present invention can also be implemented by instructing related hardware through computer-readable instructions. The computer-readable instructions can be stored in a computer-readable storage medium, and when executed by a processor, the computer-readable instructions can implement the steps of the various method embodiments described above.

[0181] Other embodiments of this application will readily occur to those skilled in the art upon consideration of the specification and practice of the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of this application that follow the general principles of this application and include common knowledge or customary techniques in the art not disclosed herein. The specification and examples are to be considered exemplary only, and the true scope and spirit of this application are indicated by the following claims.

[0182] It should be understood that this application is not limited to the precise structure described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of this application is limited only by the appended claims.

Claims

1. A terminal access method, characterized in that, Applied to SL-side traverse terminal, including: Before an SL terminal accesses a channel, it receives a successful occupancy message broadcast by another SL terminal in the CCCH channel within a listening window. The successful occupancy message includes a resource selection window to be screened and a reference signal received power. If the resource selection window to be screened is determined to be the target resource selection window, and if the reference signal received power is determined to be greater than a first preset power value, it determines that it is in the same group as the other SL terminal. It occupies at least one sub-channel under the target resource selection window with multiple SL terminals in the same group based on the LBT protocol. A successful occupancy message is broadcast to the WIFI terminal in the common control CCCH channel. The successful occupancy message is used to inform the WIFI terminal that the target resource selection window has been occupied by the SL terminal. Based on Sidelink mode 2, access the channel under the target resource selection window.

2. The method as described in claim 1, characterized in that, After the multiple SL terminals belonging to the same group occupy at least one sub-channel under the target resource selection window based on the LBT protocol, the method further includes: In the CCCH channel, a successful occupancy message is sent to other SL terminals within the same packet.

3. The method as described in claim 1, characterized in that, After the multiple SL terminals belonging to the same group occupy at least one sub-channel under the target resource selection window based on the LBT protocol, the method further includes: If it is determined that the number of sub-channels occupied by itself based on the LBT protocol is greater than a first value, and if it is determined that the number of sub-channels occupied by all SL terminals in the same group based on the LBT protocol is greater than a second value, the second value is greater than the first value. The target resource selection window is confirmed to have been successfully occupied, and a successful occupancy message is broadcast to the WIFI terminal in the Common Control Channel (CCCH).

4. The method as described in claim 1 or 3, characterized in that, After the multiple SL terminals belonging to the same group occupy at least one sub-channel under the target resource selection window based on the LBT protocol, the method further includes: If it is determined that the number of sub-channels occupied by all SL terminals in the same group based on the LBT protocol is less than or equal to the second value, it is determined that the target resource selection window has not been successfully occupied. Multiple SL terminals belonging to the same group occupy at least one sub-channel under other resource selection windows based on the LBT protocol.

5. A terminal access method, characterized in that, Applied to WIFI terminals, including: The system listens for a successful occupancy message broadcast by an SL terminal on the CCCH channel. This successful occupancy message informs the WIFI terminal that the target resource selection window has been occupied by the SL terminal. The successful occupancy message is received within the listening window from other SL terminals broadcasting successful occupancy messages on the CCCH channel before the SL terminal accesses the channel. The successful occupancy message includes the resource selection window to be filtered and the reference signal reception power. If the resource selection window to be filtered is determined to be the target resource selection window, and if the reference signal reception power is determined to be greater than a first preset power value, the system determines that it is in the same group as the other SL terminals. This message is then broadcast to the WIFI terminal on the common control CCCH channel after multiple SL terminals in the same group have occupied at least one sub-channel under the target resource selection window based on the LBT protocol. The sub-channels under the target resource selection window are not occupied, and the CCCH channel is continued to be monitored; When the SL terminal receives the resource selection message broadcast on the CCCH channel, it occupies the sub-channels that are not occupied by the SL terminal under the target resource selection window; Access a sub-channel that is not occupied by the SL terminal.

6. The method as described in claim 5, characterized in that, After detecting the successful occupancy message broadcast by the SL terminal on the CCCH channel, the following is also included: Detect whether the received power of the reference signal of the CCCH channel broadcast by the SL terminal is greater than a second preset power value; If the value is greater than the target resource selection window, the sub-channel under the target resource selection window will not be occupied, and the CCCH channel will continue to be monitored. If it is not greater than, it will compete with the SL terminal for the sub-channel under the target resource selection window.

7. The method as described in claim 5 or 6, characterized in that, The step of occupying a sub-channel not occupied by the SL terminal under the target resource selection window after the SL terminal has been detected broadcasting a resource selection message on the CCCH channel includes: From the resource selection message, determine the sub-channels that have been occupied by the SL terminal under the target resource selection window; Based on the sub-channels already occupied by the SL terminal, determine the sub-channels not occupied by the SL terminal under the target resource selection window.

8. An access device for a terminal, characterized in that, Applied to SL-side traverse terminal, including: The first occupancy module is configured to receive, within a listening window, a successful occupancy message broadcast by other SL terminals in the CCCH channel before the SL terminal accesses the channel. The successful occupancy message includes a resource selection window to be screened and a reference signal received power. If the resource selection window to be screened is determined to be the target resource selection window, and if the reference signal received power is determined to be greater than a first preset power value, the module determines that it is in the same group as the other SL terminals. The module occupies at least one sub-channel under the target resource selection window with multiple SL terminals in the same group based on the LBT protocol. The broadcast module is configured to broadcast a successful occupancy message to the WIFI terminal in the common control CCCH channel. The successful occupancy message is used to inform the WIFI terminal that the target resource selection window has been occupied by the SL terminal. The first access module is configured to access the channel under the target resource selection window based on Sidelink mode 2.

9. A terminal access device, characterized in that, Applied to WIFI terminals, including: The monitoring module is configured to monitor successful occupancy messages broadcast by SL terminals on the CCCH channel. These successful occupancy messages inform the WIFI terminal that the target resource selection window has been occupied by the SL terminal. Before the SL terminal accesses the channel, it receives successful occupancy messages broadcast by other SL terminals on the CCCH channel within the monitoring window. These successful occupancy messages include a target resource selection window and a reference signal reception power. If the target resource selection window is determined to be the target resource selection window, and if the reference signal reception power is determined to be greater than a first preset power value, the module determines that it is in the same group as the other SL terminals. It then occupies at least one sub-channel under the target resource selection window based on the LBT protocol with multiple SL terminals belonging to the same group, and subsequently broadcasts this message to the WIFI terminal on the common control CCCH channel. The monitoring module is configured not to occupy the sub-channels under the target resource selection window, and to continue monitoring the CCCH channel; The second occupancy module is configured to occupy a sub-channel not occupied by the SL terminal under the target resource selection window after listening to the resource selection message broadcast by the SL terminal on the CCCH channel; The second access module is configured to access a sub-channel that is not occupied by the SL terminal.

10. An electronic device, characterized in that, include: Memory, used to store executable instructions; as well as, A processor, configured to work with the memory to execute the executable instructions to perform the access method for any of the terminals described in claims 1-7.

11. A computer-readable storage medium for storing computer-readable instructions, characterized in that, When the instruction is executed, it performs the operation of the access method of any of the terminals described in claims 1-7.

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