Wireless communication method and device

Abstract

The embodiment of the present application provides a method and device for wireless communication. When there is an overlapping area between LL TWT SPs on multiple links of NSTR Non-AP MLD, a master-slave transmission mode is set on multiple links to avoid the inability of a low-latency service on a certain link to be transmitted within the LL TWT SP due to the inability of the NSTR Non-AP MLD device to receive and send at the same time. Thus, the transmission delay requirements of low-latency services on multiple links of NSTR Non-AP MLD can be guaranteed, and the transmission of multiple links of NSTR Non-AP MLD can be optimized.

Description

Technical Field

[0001] The embodiments of the present application relate to the field of communications, and more specifically, to a method and device for wireless communications. Background Art

[0002] Wireless Fidelity (WiFi) communication introduces the NonSimultaneous transmit and receive (NSTR) Multi-Link Device (MLD) transmission mechanism. For scenarios where low-latency services are carried on multiple links of NSTR MLD, how to ensure the latency requirements of low-latency service transmission on multiple links is a technical problem that needs to be solved urgently. Summary of the invention

[0003] The embodiments of the present application provide a method and device for wireless communication, which can ensure the latency requirements of low-latency service transmission on multiple links when low-latency services are carried on multiple links of NSTR MLD, thereby optimizing the multi-link transmission of NSTRMLD.

[0004] In a first aspect, a wireless communication method is provided, which is applied to a Non-AP MLD, wherein the Non-AP MLD includes at least a first STA and a second STA, and the first STA forms a first link with a first AP in an AP MLD associated with the first STA, and the second STA forms a second link with a second AP in the AP MLD; the method includes:

[0005] In a case where a first LL TWT SP is established on the first link, the Non-AP MLD performs data transmission on the first link and the second link.

[0006] In a second aspect, a wireless communication method is provided, which is applied to an AP MLD, wherein the AP MLD includes at least a first AP and a second AP, and the first AP forms a first link with a first STA in a Non-AP MLD associated with the first AP, and the second AP forms a second link with a second STA in the Non-AP MLD; the method includes:

[0007] In a case where the first LL TWT SP is established on the first link, the AP MLD performs data transmission on the first link and the second link.

[0008] According to a third aspect, a wireless communication device is provided, for executing the method according to the first aspect.

[0009] Specifically, the wireless communication device includes a functional module for executing the method in the above-mentioned first aspect.

[0010] In a fourth aspect, a wireless communication device is provided, for executing the method in the second aspect.

[0011] Specifically, the wireless communication device includes a functional module for executing the method in the above-mentioned second aspect.

[0012] In a fifth aspect, a wireless communication device is provided, comprising a processor and a memory, wherein the memory is used to store a computer program, and the processor is used to call and run the computer program stored in the memory to execute the method in the first aspect.

[0013] In a sixth aspect, a wireless communication device is provided, comprising a processor and a memory, wherein the memory is used to store a computer program, and the processor is used to call and run the computer program stored in the memory to execute the method in the second aspect.

[0014] In a seventh aspect, a device is provided for implementing the method in any one of the first to second aspects above.

[0015] Specifically, the apparatus includes: a processor, configured to call and run a computer program from a memory, so that a device equipped with the apparatus executes the method in any one of the first to second aspects described above.

[0016] In an eighth aspect, a computer-readable storage medium is provided for storing a computer program, wherein the computer program enables a computer to execute the method in any one of the first to second aspects above.

[0017] In a ninth aspect, a computer program product is provided, comprising computer program instructions, wherein the computer program instructions enable a computer to execute the method in any one of the first to second aspects above.

[0018] In a tenth aspect, a computer program is provided, which, when executed on a computer, enables the computer to execute the method in any one of the first to second aspects above.

[0019] Through the above technical solution, when low-latency services are carried on multiple links of NSTR MLD, the latency requirements of low-latency service transmission on multiple links can be guaranteed, thereby optimizing the multi-link transmission of NSTR MLD. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of a communication system architecture applied in an embodiment of the present application.

[0021] Figure 2 It is a schematic diagram of a delay-sensitive business flow provided by this application.

[0022] Figure 3 It is a schematic diagram of a periodic reserved resource provided by the present application.

[0023] Figure 4 It is a schematic diagram of a restricted TWT mechanism provided in this application.

[0024] Figure 5 This is a schematic diagram of the combination of a TWT element and a silent element provided in this application.

[0025] Figure 6 It is a schematic diagram of asynchronous transmission and synchronous transmission provided by this application.

[0026] Figure 7 This is a schematic diagram of PPDU end time alignment provided by the present application.

[0027] Figure 8 It is a schematic diagram of OOB interference within an overlapping LL TWT SP provided by the present application.

[0028] Fig. 9 It is a schematic diagram of LL TWT SP overlap applied in an embodiment of the present application.

[0029] Fig.10 It is a schematic flowchart of a wireless communication method provided according to an embodiment of the present application.

[0030] Fig.11 It is a schematic diagram of a system architecture applied in an embodiment of the present application.

[0031] Fig.12 It is a schematic diagram of establishing a TWT protocol provided according to an embodiment of the present application.

[0032] Figures 13 to 23 They are respectively schematic diagrams of LL TWT SP provided according to the embodiments of the present application.

[0033] Fig.24 It is a schematic block diagram of a wireless communication device provided according to an embodiment of the present application.

[0034] Fig.25 It is a schematic block diagram of a wireless communication device provided according to an embodiment of the present application.

[0035] Fig.26 It is a schematic block diagram of a communication device provided according to an embodiment of the present application.

[0036] Fig. 27 It is a schematic block diagram of a device provided according to an embodiment of the present application.

[0037] Fig.28 It is a schematic block diagram of a communication system provided according to an embodiment of the present application. DETAILED DESCRIPTION

[0038] The following will describe the technical solutions in the embodiments of the present application in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. For the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0039] The technical solutions of the embodiments of the present application can be applied to various communication systems, such as Wireless Local Area Networks (WLAN), Wireless Fidelity (WiFi) or other communication systems.

[0040] For example, the communication system 100 used in the embodiment of the present application can be as follows: Figure 1 The communication system 100 may include an access point (AP) device 110 and a station (STA) device 120 that accesses a network through the access point device 110 .

[0041] In an embodiment of the present application, the STA device can be deployed on land, including indoors or outdoors, handheld, wearable or vehicle-mounted; it can also be deployed on the water surface (such as ships, etc.); it can also be deployed in the air (for example, on airplanes, balloons and satellites, etc.).

[0042] In the embodiment of the present application, the STA device can be a mobile phone, a tablet computer, a computer with wireless transceiver function, a virtual reality (VR) device, an augmented reality (AR) device, a wireless device in industrial control, a wireless device in self driving, a wireless device in remote medical, a wireless device in a smart grid, a wireless device in transportation safety, a wireless device in a smart city, or a wireless device in a smart home, etc.

[0043] As an example and not a limitation, in the embodiments of the present application, the STA device may also be a wearable device. Wearable devices may also be referred to as wearable smart devices, which are a general term for wearable devices that use wearable technology to intelligently design and develop wearable devices for daily wear, such as glasses, gloves, watches, clothing, and shoes. A wearable device is a portable device that is worn directly on the body or integrated into the user's clothes or accessories. Wearable devices are not just hardware devices, but also achieve powerful functions through software support, data interaction, and cloud interaction. Broadly speaking, wearable smart devices include full-featured, large-size, and independent of smartphones to achieve complete or partial functions, such as smart watches or smart glasses, as well as those that only focus on a certain type of application function and need to be used in conjunction with other devices such as smartphones, such as various types of smart bracelets and smart jewelry for vital sign monitoring.

[0044] Figure 1 An AP and two STAs are shown exemplarily. Optionally, the communication system 100 may include multiple APs and other numbers of STAs, which is not limited in the embodiments of the present application.

[0045] It should be understood that the device with communication function in the network / system in the embodiment of the present application can be referred to as a communication device. Figure 1 Taking the communication system 100 shown as an example, the communication equipment may include an access point 110 and a site 120 with communication functions. The access point 110 and the site 120 may be the specific devices described above and will not be repeated here. The communication equipment may also include other devices in the communication system 100, such as a network controller, a gateway and other network entities, which is not limited in the embodiments of the present application.

[0046] It should be understood that the terms "system" and "network" are often used interchangeably in this article. The term "and / or" in this article is only a description of the association relationship of associated objects, indicating that three relationships can exist. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0047] It should be understood that the "indication" mentioned in the embodiments of the present application can be a direct indication, an indirect indication, or an indication of an association relationship. For example, A indicates B, which can mean that A directly indicates B, for example, B can be obtained through A; it can also mean that A indirectly indicates B, for example, A indicates C, and B can be obtained through C; it can also mean that there is an association relationship between A and B.

[0048] The terms used in the implementation mode of this application are only used to explain the specific embodiments of this application, and are not intended to limit this application. The terms "first", "second", "third" and "fourth" in the specification and claims of this application and the drawings are used to distinguish different objects, rather than to describe a specific order. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions.

[0049] In the description of the embodiments of the present application, the term "corresponding" may indicate a direct or indirect correspondence between two items, or an association relationship between the two items, or a relationship between indication and being indicated, configuration and being configured, and the like.

[0050] In the embodiments of the present application, "pre-defined" can be implemented by pre-saving corresponding codes, tables or other methods that can be used to indicate relevant information in a device (for example, including a site device and an access point device), and the present application does not limit the specific implementation method. For example, pre-defined can refer to what is defined in the protocol.

[0051] In the embodiments of the present application, the "protocol" may refer to a standard protocol in the communication field, for example, it may include a WiFi protocol and related protocols used in future WiFi communication systems, and the present application does not limit this.

[0052] To facilitate understanding of the technical solutions of the embodiments of the present application, the technical solutions related to the present application are described below. The following related technologies can be arbitrarily combined with the technical solutions of the embodiments of the present application as optional solutions, and they all belong to the protection scope of the embodiments of the present application. The embodiments of the present application include at least part of the following contents.

[0053] With the emergence of a large number of delay-sensitive applications such as VR / AR, cloud games, and real-time video, extremely low-latency performance has become an important requirement for data transmission (delay-sensitive traffic is generally bursty and periodic, such as Figure 2 ). It has been pointed out in the Project Authorization Request (PAR) of the 802.11be standard that in addition to supporting a maximum throughput of 30Gbps, this standard also needs to improve the latency and jitter performance of WiFi transmission. At the same time, the project reasons in the standard development content document Criteria for Standard Development (CSD) point out that reducing latency and jitter is an important feature that distinguishes this standard from other standards. Existing technical solutions cannot bring a good experience to users when dealing with delay-sensitive applications; therefore, there is an urgent need for solutions that can improve latency performance to meet the needs of delay-sensitive applications.

[0054] The 802.11be working group discussed some technical solutions for low latency, including enhanced Enhanced Distributed Channel Access (EDCA) mechanism, resource preemption, multi-channel operation, transmission opportunity (TXOP) sharing, TXOP rule modification, Orthogonal Frequency Division Multiple Access (OFDMA) enhancement, resource reservation, target wake time (TWT) mechanism enhancement, multi-link operation (MLO), etc.

[0055] 1) The idea of ​​the enhanced EDCA mechanism is to add a new EDCA queue for delay-sensitive traffic and assign it a higher priority EDCA competition parameter, thereby reducing the access delay of delay-sensitive traffic.

[0056] 2) The idea of ​​multi-link MLO is to replace traditional devices with multi-link devices (MLD). MLD devices can operate multiple links at the same time and compete for channels on multiple links, thereby reducing channel access delay.

[0057] 3) The idea of ​​TWT mechanism enhancement is to reuse the TWT mechanism to allocate periodic, protected low latency target wake time service periods (LL TWTSP) for delay-sensitive traffic. During the LL TWT SP period, the link where the delay-sensitive traffic is located has an exclusive channel or competes for the channel with high priority, thereby reducing its channel access delay.

[0058] This application combines the above-mentioned enhanced TWT mechanism with the MLO scheme: the scheme combining the TWT element (TWT element) and the quiet element (Quiet element) is further extended to multi-links, and the transmission interference problem existing in NSTR MLD is solved, thereby improving the delay performance of delay-sensitive traffic to a certain extent.

[0059] In order to better understand the embodiments of the present application, a resource reservation scheme is described.

[0060] The main idea of ​​the resource reservation scheme is to allocate periodic reserved resources for periodic delay-sensitive traffic, such as Figure 3Within the reserved resources, STAs with negotiated uplink low-latency traffic are allowed to access the channel, and other STAs are not allowed to perform uplink transmission or channel access (or compete for the channel with low priority) within the reserved resources.

[0061] Advantages of resource reservation scheme: By reserving resources for specific traffic types, a less congested channel can be provided for delay-sensitive traffic, thereby alleviating the pressure of channel competition. In addition, other traffic can be allowed to compete for the channel with a lower priority, thereby improving resource utilization.

[0062] To facilitate a better understanding of the embodiments of the present application, a solution for providing protected resources for periodic low-latency communication (Low Latency Traffic, LL Traffic) using an improved TWT mechanism is described.

[0063] Delay-sensitive traffic generally has bursty and periodic characteristics, and the TWT mechanism in the 802.11ax standard can just establish a periodic target wake time service period (Target Wake Time ServicePeriod, TWT SP) protocol between STA and AP. Therefore, the TWT mechanism can be reused to allocate periodic TWT SP to STAs with periodic uplink delay-sensitive traffic as the implementation of the above-mentioned resource reservation. However, the TWT mechanism has certain defects: that is, before the TWT SP negotiated by the STA and AP starts, if the previous transmission is not completed, it will not stop its transmission, resulting in uncertainty in the start time of the TWT SP.

[0064] The restricted TWT mechanism requires that the transmission of other STAs must be stopped before the start of the restricted TWT SP, so as to ensure the normal start of the restricted TWT SP and ensure that LL Traffic can complete the transmission within the limited delay. Figure 4As shown. Before a restricted TWT SP starts, the transmission opportunity (TXOP) of other regular STAs (i.e., STAs that do not support low-latency services) should be ended, and the TXOP of the STA should be terminated before the TXOP expires, so that the STAs that support low-latency services (Low-latency STAs) can exchange frames within the specified SP. Among them, the Request To Send (RTS) or Clear To Send (CTS) protocol is equivalent to a handshake protocol, which is used to solve the frame exchange conflict problem caused by hidden terminals. RTS is enabled after a Distributed Inter-frame Spacing (DIFS). When RTS / CTS is enabled, a station sends an RTS frame before sending a data frame. When the receiver is willing to receive the data frame, it will respond with a CTS frame. After the RTS / CTS exchange, a time window (marked in the CTS frame) is opened for the station as the sender to send a data frame to the station that confirms the reception. After receiving the data frame, the receiver feeds back an Acknowledgement (ACK) or Block Acknowledgment (BA) to the sender after a short interframe space (SIFS) to confirm receipt of the data frame.

[0065] Specifically, the TWT element and the Quiet element can be combined to terminate the transmission of other STAs before the start of the RestrictedTWT SP. Specifically, the period, start time, end time and other parameters of the TWT SP negotiated by the STA and the AP and the relevant parameters of the Quiet element are set to the same value, such as Figure 5 As shown in the figure, since the Quietelement element already existed in the previous standard, both traditional STA and Extremely High Throughput (EHT) STA can set their own quiet time according to the Quiet element; while the EHT STA participating in the Restricted TWT SP can ignore the Quiet element, wake up normally during the Restricted TWT SP, and then exchange data with the AP.

[0066] In order to better understand the embodiments of the present application, a multi-link data transmission scheme is described.

[0067] There are two transmission modes in MLO: asynchronous transmission and synchronous transmission. Asynchronous transmission means that each link in the multi-link operated by MLD operates independently and does not need to be synchronized; synchronous transmission means that each link must be synchronized and synchronized; Figure 6 As shown. However, if a Non-AP MLD is an NSTR device, it cannot use the asynchronous operation mode. Because there will be Out Of Band (OOB) (or Coexistence in devices (IDC)) interference problems on the NSTR link pair; therefore, if a MLD needs to transmit data on a pair of NSTR link pairs at the same time, it needs to perform synchronous operation to avoid the OOB problem.

[0068] In the multi-link data transmission mode, in order to avoid OOB or IDC interference problems, there is a PPDU alignment solution, which can be divided into two methods: physical layer protocol data unit (PPDU) start time alignment and PPDU end time alignment, that is, ending time alignment. PPDU start time alignment requires certain modifications to the existing access mechanism.

[0069] PPDU ending time alignment method, such as Figure 6 As shown in the figure, the absolute value of the difference in the end time of the PPDU transmitted on multiple links should be less than a certain limit (such as the short interframe space (SIFS)), so as to prevent the OOB problem. If there is no such limit, after the fixed (solicited) PPDU sent on a link 1 (Link1) ends, a response PPDU will be received after SIFS time; at this time, if data is still being sent on link 2 (Link2), the reception of the response PPDU will be affected.

[0070] In NSTR Non-AP MLD, if there is LL TWT SP1 on a certain Link1, then the transmission on other links (such as Link2) should be adjusted during the LL TWT SP1. For AP MLD, after the subordinate AP1 of AP MLD on Link1 and the subordinate STA1 of NSTR Non-AP MLD on Link1 negotiate a LL TWT SP, AP MLD has two options: 1. AP MLD aligns the ending time of the PPDU sent to Non-AP MLD on Link1 and Link2; 2. AP MLD cannot send frames to Non-AP MLD on Link2 within the LL TWT SP. For Non-AP MLD, the subordinate STA2 on Link2 stops its TXOP before the start of the LL TWT SP.

[0071] Rules such as resource preemption, multi-channel operation, TXOP sharing, TXOP rule modification, and OFDMA enhancement have not yet been determined in the current standards and cannot be directly applied.

[0072] The enhanced EDCA mechanism is only a part of the overall Quality of Service (QoS) framework. It is a prerequisite for meeting the needs of delay-sensitive applications and improving user experience. It cannot meet the needs alone and needs to be used in conjunction with other technical solutions. For example, it can be used in conjunction with MLO to form a time-sensitive link.

[0073] MLO operation is only at the conceptual level in terms of reducing latency. For example, if a device can support 8 active links and each link can support 1 millisecond of latency with a 90% probability, then this multi-link device can theoretically support 1 millisecond of latency with a 99,999999% probability. However, in the current standards, the specific implementation and operation of MLO in terms of low latency have not been mentioned too much; and MLO still has problems such as OOB interference inside NSTR STA devices that need to be solved, and there is still a lot of detailed work to be done before it can truly provide services for latency-sensitive services.

[0074] The enhanced TWT mechanism is the latest progress of 802.11be regarding low latency. It combines the TWT element and the Quiet element to provide protected access periods for periodic delay-sensitive traffic. On the one hand, the Quiet element can prevent non-LL TWT SP member STAs from competing for channels during the LL TWT SP period; on the other hand, LL TWT SP member STAs can ignore the Quiet element, thereby waking up and transmitting data at the beginning of the LL TWT SP. However, the current discussion is only for a single link, and there has been no discussion on applying the Quiet element to multiple links. There are potential problems in multiple links, such as NSTR MLD devices, so it cannot be directly applied to multiple links, and it is impossible to provide the best possible service for delay-sensitive applications. For example, Figure 8 The OOB interference problem in the LL TWT SP shown in FIG. 1 is shown in FIG. 1. If the solution is directly applied to an NSTR MLD device with two links, the LL TWT SPs on the two links may overlap. In this case, since the NSTR MLD device cannot receive and send at the same time, the low-latency service on a link may not be transmitted in the LL TWT SP.

[0075] It should be noted that the station device (STA) may also be referred to as a non-access point station (Non-AP STA).

[0076] Based on the above problems, this application proposes a solution for multi-link LL TWT SP collaborative operation based on NSTR MLD equipment. Aiming at the scenario where multiple links of NSTR MLD equipment carry low-latency services respectively, the latency requirements of low-latency service transmission on multiple links are guaranteed.

[0077] The LL TWT mentioned in this application refers to a TWT established using a Restricted TWT mechanism. This application uses Non-AP MLD and AP MLD for data transmission as an example.

[0078] In the present application, the Non-AP MLD is an NSTR Non-AP MLD, and the AP MLD is a Simultaneous transmit and receive (STR) AP MLD.

[0079] Application scenario of this application: When the AP MLD is NSTR Non-AP MLD to establish LL TWT SP in NSTR Link Pair, there are two situations: 1) For the same time interval, only one link's LL TWT SP includes the interval (that is, the LL TWT SPs on the NSTR Link Pair do not overlap); 2) The LL TWT SPs on both links include the interval (that is, the LL TWT SPs on the NSTR Link Pair have overlapping areas), such as Fig. 9 shown.

[0080] It should be noted that the present application covers various situations involving the LL TWT SP overlap problem in multi-links; in addition, the solution for extending the Quiet element to multi-links is also within the protection scope of the present application.

[0081] The technical solution of the present application is described in detail below through specific embodiments.

[0082] Fig.10 2 is a schematic flow chart of a wireless communication method 200 according to an embodiment of the present application, wherein the wireless communication method 200 is applied to a multi-link communication system formed by a Non-AP MLD and an AP MLD, wherein the Non-AP MLD includes at least a first STA and a second STA, and the first STA forms a first link with a first AP in an AP MLD associated with the first STA, and the second STA forms a second link with a second AP in an AP MLD associated with the second STA. Specifically, Fig.10 As shown, the wireless communication method 200 may include at least part of the following contents:

[0083] S210: When a first LL TWT SP is established on the first link, the Non-AP MLD and / or the APMLD performs data transmission on the first link and the second link.

[0084] In the embodiment of the present application, the first STA establishes the first LLTWT SP on the first link according to the first information.

[0085] In the embodiment of the present application, the first link and the second link are a pair of NSTR Link Pairs. Fig.11 As shown, the AP MLD includes a first AP and a second AP, the Non-AP MLD includes a first STA and a second STA, a first link formed by the first STA and the first AP, and a second link formed by the second STA and the second AP. Messages can be exchanged between the attached devices in the same MLD, for example, messages can be exchanged between the first AP and the second AP, and messages can be exchanged between the first STA and the second STA.

[0086] It should be noted that Non-AP MLD is generally NSTR MLD, and AP MLD is generally STR MLD.

[0087] It should be noted that the NSTR MLD may also include other links besides the first link and the second link, which is not limited in the present application.

[0088] It should be noted that the purpose of establishing the LL TWT SP is to provide a protection period for the delay-sensitive traffic of the NON-AP MLD with multiple delay-sensitive service flows. For example, in the first LL TWT SP, only the first STA and the first AP can access the channel and perform data transmission.

[0089] In some embodiments, the first STA and the second STA send Restricted TWT (R-TWT) request frames to the first AP and the second AP, respectively, requesting to establish their respective R-TWT agreements. After receiving the R-TWT request frame, the first AP and / or the second AP determine the R-TWT parameters and then send R-TWT response frames to the first STA and / or the second STA to agree to establish the TWT agreement; or, the first STA sends a multi-link R-TWT request frame to the first AP, requesting to establish an R-TWT agreement on the first link and the second link, respectively. After receiving the Multi-link R-TWT request frame, the first AP determines the R-TWT parameters on the two links and then sends a Multi-link R-TWT response frame to the first STA to agree to establish the R-TWT agreement on the first link and the second link. At this point, the establishment of the LL TWT SP on the two links is completed.

[0090] After receiving the R-TWT response frame from AP MLD, the Non-AP MLD related subordinate STA (first STA and / or second STA) receives the beacon frame at the target beacon transmission time (Target Beacon Transmission Time, TBTT). The Beacon frame contains both R-TWT elements and quiet elements (Quiet element), where the R-TWT element indicates LL TWT SP related information. The quiet intervals (Quiet Intervals) indicated by the Quiet element completely overlap with the TWT SP indicated by the TWT element. The specific process is as follows: Fig.12 shown.

[0091] In some embodiments, a first LLTWT SP is established on the first link and a second LLTWT SP is established on the second link.

[0092] In some embodiments, the first LL TWT SP completely overlaps with the second LL TWT SP in the time domain, or the first LL TWT SP partially overlaps with the second LL TWT SP in the time domain, or the first LL TWT SP does not overlap with the second LL TWT SP in the time domain.

[0093] It should be noted that the first LL TWT SP and the second LL TWT SP completely overlap in the time domain, including having the same start time and end time, and the same LL TWT parameters.

[0094] In some embodiments, when the first LL TWT SP and the second LL TWT SP completely overlap or partially overlap in the time domain, the Non-AP MLD and / or the AP MLD can perform data transmission on the first link and the second link according to the master-slave transmission mode on the first link and the second link.

[0095] For example, when the first link and the second link of the Non-AP MLD belong to an NSTR link pair (NSTRLink Pair), the Non-AP MLD performs data transmission on the first link and the second link according to the master-slave transmission mode on the first link and the second link.

[0096] In some embodiments, the first LL TWT SP and the second LL TWT SP are internally configured to enable a leader / follower transmission mode, and the first LL TWT SP and the second LL TWT SP are externally configured to disable the leader / follower transmission mode.

[0097] That is, for the first link and the second link, within the LL TWT SP area, the transmission of the two links turns on the Leader / Follower transmission mode; outside the LL TWT SP area, the transmission of the two links turns off the Leader / Follower transmission mode. The NSTR MLD device has the function of switching the link Leader / Follower operation mode.

[0098] In some embodiments, in the area where the second LL TWT SP overlaps with the first LL TWT SP in the time domain, when the first link is in the leader transmission mode, the second link is in the follower transmission mode, the second AP and / or the second STA does not actively send data, and the second AP and / or the second STA passively performs synchronous transmission or stops data transmission and reception according to the transmission on the first link. (Corresponding to the transmission in the area where the first LL TWT SP and the second LL TWT SP overlap in the time domain)

[0099] In some embodiments, in the area where the first LL TWT SP and the second LL TWT SP overlap in the time domain, when the first link is in the follower transmission mode, the second link is in the leader transmission mode, the first AP and / or the first STA does not actively send data, and the first AP and / or the first STA passively performs synchronous transmission or stops data transmission and reception according to the transmission on the second link. (Corresponding to the transmission in the area where the first LL TWT SP and the second LL TWT SP overlap in the time domain)

[0100] In some embodiments, when the first AP and / or the first STA performs data transmission in the first LL TWT SP area, and the second AP and / or the second STA overlaps with the first LL TWT SP in the time domain but is not in the area of ​​the second LL TWT SP, the second AP and / or the second STA does not actively send data, and the second AP and / or the second STA passively performs synchronous transmission or stops data transmission and reception according to the transmission on the first link. (Corresponding to the transmission of the first LL TWTSP and the second LL TWT SP in the non-overlapping area in the time domain)

[0101] In some embodiments, when the second AP and / or the second STA performs data transmission in the second LL TWT SP area, and the first AP and / or the first STA overlaps with the second LL TWT SP in the time domain but is not in the area of ​​the first LL TWT SP, the second AP and / or the second STA does not actively send data, and the second AP and / or the second STA passively performs synchronous transmission or stops data transmission and reception according to the transmission on the first link. (Corresponding to the transmission of the first LL TWTSP and the second LL TWT SP in the non-overlapping area in the time domain)

[0102] That is to say, within the LL TWT SP area, it is necessary to select the Leader Link and the Follower Link in the NSTR Link Pair (i.e., the first link and the second link); the Leader link determines the order of data packet transmission, the Follower link does not actively send data, and the Follower link passively performs synchronous transmission according to the transmission of the Leader link.

[0103] In some embodiments, the master-slave transmission mode of the first link is controlled by the first AP and / or the first STA, and / or the master-slave transmission mode of the second link is controlled by the second AP and / or the second STA.

[0104] In some embodiments, the master-slave transmission mode of the first link is controlled by the first AP through a trigger frame or a management frame to indicate the first STA, and / or the master-slave transmission mode of the second link is controlled by the second AP through a trigger frame or a management frame to indicate the second STA.

[0105] For example, the first AP sends a trigger frame to the first STA to instruct the first STA to set the first link to the main transmission mode, and the first STA sets the first link to the main transmission mode according to the instruction of the trigger frame.

[0106] For another example, the first AP sends a management frame to the first STA to instruct the first STA to set the first link to the slave transmission mode, and the first STA sets the first link to the slave transmission mode according to the instruction of the management frame.

[0107] In some embodiments, the first STA receives a first indication message sent by the first AP via a trigger frame or a management frame, where the first indication message is used to indicate the transmission mode of the first link; and the first STA sets the master-slave transmission mode of the first link according to the first indication message.

[0108] In some embodiments, when the first LL TWT SP and the second LL TWT SP are both trigger-enabled LL TWT SPs, the master-slave transmission mode of the first link is controlled by the first AP, and / or the master-slave transmission mode of the second link is controlled by the second AP.

[0109] It should be noted that, when the first LL TWT SP and the second LL TWT SP are both trigger-enabled LL TWT SPs, the first STA is not allowed to use the EDCA mechanism for channel access in the first LL TWT SP, and the second STA is not allowed to use the EDCA mechanism for channel access in the second LL TWT SP.

[0110] In some embodiments, the master-slave transmission mode of the first link is indicated by the value of a variable in the LL TWT SP module in the first AP; wherein the LL TWT SP module in the first AP includes a first information field and / or a second information field, the variable value in the first information field is used to indicate whether the master-slave transmission mode is turned on, and the variable value in the second information field is used to indicate whether the first link is in the master transmission mode or the slave transmission mode.

[0111] For example, in the LL TWT SP module in the first AP, the first information field includes a 0 / 1 variable: 0 represents the leader / follower transmission mode is closed; 1 represents the leader / follower transmission mode is opened; the second information field includes a 0 / 1 variable: 0 represents the follower transmission mode, and 1 represents the leader transmission mode.

[0112] In some embodiments, the master-slave transmission mode of the first link is indicated by the value of a variable in the LL TWT SP module in the first STA; wherein the LL TWT SP module in the first STA includes a third information field and / or a fourth information field, the variable value in the third information field is used to indicate whether the master-slave transmission mode is turned on, and the variable value in the fourth information field is used to indicate that the first link is in the master transmission mode or the slave transmission mode.

[0113] For example, in the LL TWT SP module in the first STA, the third information field includes 0 / 1 variables: 0 represents leader / follower transmission mode is closed; 1 represents leader / follower transmission mode is turned on; the fourth information field includes 0 / 1 variables: 0 represents follower transmission mode, 1 represents leader transmission mode.

[0114] In some embodiments, the master-slave transmission mode of the second link is indicated by the value of a variable in the LL TWT SP module in the second AP; wherein the LL TWT SP module in the second AP includes a fifth information field and / or a sixth information field, the variable value in the fifth information field is used to indicate whether the master-slave transmission mode is turned on, and the variable value in the sixth information field is used to indicate whether the second link is in the master transmission mode or the slave transmission mode.

[0115] For example, in the LL TWT SP module in the second AP, the fifth information field includes a 0 / 1 variable: 0 represents leader / follower transmission mode off; 1 represents leader / follower transmission mode on; the sixth information field includes a 0 / 1 variable: 0 represents follower transmission mode, 1 represents leader transmission mode.

[0116] In some embodiments, the master-slave transmission mode of the second link is indicated by the value of a variable in the LL TWT SP module in the second STA; wherein the LL TWT SP module in the second STA includes a seventh information field and / or an eighth information field, the variable value in the seventh information field is used to indicate whether the master-slave transmission mode is turned on, and the variable value in the eighth information field is used to indicate that the second link is in the master transmission mode or the slave transmission mode.

[0117] For example, in the LL TWT SP module in the second STA, the seventh information field includes 0 / 1 variables: 0 represents leader / follower transmission mode is closed; 1 represents leader / follower transmission mode is turned on; the eighth information field includes 0 / 1 variables: 0 represents follower transmission mode, 1 represents leader transmission mode.

[0118] In some embodiments, the first AP determines the transmission mode of the first link based on at least one of the priority of the service transmitted within the first LL TWT SP, the priority of the service transmitted within the second LL TWT SP, the start time of the first LL TWT SP, the start time of the second LL TWT SP, the link status information of the first link, and the link status information of the second link.

[0119] For example, when the priority of the service transmitted in the first LL TWT SP is the lowest among the services allowed to be transmitted in the LL TWT SP, the first AP determines to set the first link to the slave transmission mode.

[0120] For another example, when the priority of the service transmitted within the first LL TWT SP is the highest among the services allowed to be transmitted within the LL TWT SP, the first AP determines to set the first link to the main transmission mode.

[0121] For another example, when the link status information of the first link reflects that the link quality of the first link is poor, the first AP determines to set the first link to the slave transmission mode.

[0122] For another example, when the link status information of the first link reflects that the link quality of the first link is better, the first AP determines to set the first link to the main transmission mode.

[0123] For another example, when the priority of the service transmitted in the first LL TWT SP is lower than the priority of the service transmitted in the second LL TWT SP, the first AP determines to set the first link to the slave transmission mode.

[0124] For another example, when the priority of the service transmitted in the first LL TWT SP is higher than the priority of the service transmitted in the second LL TWT SP, the first AP determines to set the first link to the main transmission mode.

[0125] For another example, when the priority of the service transmitted within the first LL TWT SP is the same as the priority of the service transmitted within the second LL TWT SP, and the start time of the first LL TWT SP is later than the start time of the second LL TWT SP, the first AP determines to set the first link to slave transmission mode.

[0126] For another example, when the priority of the service transmitted within the first LL TWT SP is the same as the priority of the service transmitted within the second LL TWT SP, and the start time of the first LL TWT SP is earlier than the start time of the second LL TWT SP, the first AP determines to set the first link to the main transmission mode.

[0127] For another example, when the link quality of the first link reflected by the link status information of the first link is worse than the link quality of the second link reflected by the link status information of the second link, the first AP determines to set the first link to the slave transmission mode.

[0128] For another example, when the link quality of the first link reflected by the link status information of the first link is better than the link quality of the second link reflected by the link status information of the second link, the first AP determines to set the first link to the main transmission mode.

[0129] It should be noted that the link status information can be the channel attribute of the link, which can reflect the attenuation factor of the signal on each transmission path, that is, the value of each element in the link gain matrix H, such as signal scattering (Scattering), environmental attenuation (fading, multipath fading or shadowing fading), distance attenuation (power decay of distance) and other information.

[0130] In some embodiments, the transmission mode of the first link and / or the second link is determined according to a preset condition.

[0131] In some embodiments, the preset condition includes:

[0132] In the case where the priority of the service transmitted in the first LL TWT SP is lower than the priority of the service transmitted in the second LL TWT SP, the first link is in a slave transmission mode and the second link is in a master transmission mode;

[0133] In the case where the priority of the service transmitted in the first LL TWT SP is higher than the priority of the service transmitted in the second LL TWT SP, the first link is in the master transmission mode and the second link is in the slave transmission mode;

[0134] When the priority of the service transmitted in the first LL TWT SP is the same as the priority of the service transmitted in the second LL TWT SP, and the start time of the first LL TWT SP is later than the start time of the second LL TWT SP, the first link is in the slave transmission mode and the second link is in the master transmission mode;

[0135] When the priority of the service transmitted within the first LL TWT SP is the same as the priority of the service transmitted within the second LL TWT SP, and the start time of the first LL TWT SP is earlier than the start time of the second LL TWT SP, the first link is in the master transmission mode and the second link is in the slave transmission mode.

[0136] In some embodiments, the preset condition is agreed upon by a protocol, or the preset condition is agreed upon by the first AP and the second AP.

[0137] In some embodiments, the transmission mode of the first link and / or the second link is determined according to the priority of the services transmitted within the first LLTWT SP and the second LLTWT SP.

[0138] For example, when the priority of the service transmitted in the first LL TWT SP is lower than the priority of the service transmitted in the second LL TWT SP, the first link is in the slave transmission mode and the second link is in the master transmission mode.

[0139] For another example, when the priority of the service transmitted in the first LL TWT SP is higher than the priority of the service transmitted in the second LL TWT SP, the first link is in the master transmission mode and the second link is in the slave transmission mode.

[0140] In some embodiments, when the priority of the service transmitted within the first LL TWT SP is the same as the priority of the service transmitted within the second LL TWT SP, the transmission mode of the first link and / or the second link is determined based on the start time of the first LL TWT SP and the second LL TWT SP.

[0141] For example, when the priority of the service transmitted within the first LL TWT SP is the same as the priority of the service transmitted within the second LL TWT SP, and the start time of the first LL TWT SP is later than the start time of the second LL TWT SP, the first link is in the slave transmission mode and the second link is in the master transmission mode.

[0142] For another example, when the priority of the service transmitted within the first LL TWT SP is the same as the priority of the service transmitted within the second LL TWT SP, and the start time of the first LL TWT SP is earlier than the start time of the second LL TWT SP, the first link is in the master transmission mode and the second link is in the slave transmission mode.

[0143] Therefore, in an embodiment of the present application, by setting the master-slave transmission mode on the first link and the second link, the transmission of low-latency services on the link configured in the master transmission mode in the first link and the second link can be guaranteed, thereby avoiding the situation where the LL TWT SP on the two links overlap, and the low-latency service on a certain link cannot be transmitted within the LL TWT SP because the NSTR MLD device cannot receive and send at the same time.

[0144] In some embodiments, when the first link is in slave transmission mode and the second link is in master transmission mode, and the first STA cannot upload the uplink cache in time, the service period of the first LL TWT SP is configured to be extended to at least cover the uplink cache-restricted area of ​​the first STA.

[0145] In some embodiments, when the first link is in slave transmission mode and the second link is in master transmission mode, and the first STA cannot upload the downlink cache in time, the service period of the first LL TWT SP is configured to be extended to at least cover the area where the downlink cache of the first STA is limited.

[0146] In some embodiments, when the first link is in slave transmission mode, the second link is in master transmission mode, and the data transmission within the first LL TWT SP ends before the start time of the second LL TWT SP, the Non-AP MLD (such as the first STA) releases the remaining service time of the first LL TWT SP.

[0147] In some embodiments, a first LLTWT SP is established on the first link, and no LLTWT SP is established on the second link. In this case, the Non-AP MLD and / or the AP MLD can perform data transmission on the first link and the second link according to the master-slave transmission mode on the first link and the second link.

[0148] For example, when the first link and the second link of the Non-AP MLD belong to an NSTR link pair, the Non-AP MLD performs data transmission on the first link and the second link according to the master-slave transmission mode on the first link and the second link at least within the time range of the first LL TWT SP.

[0149] In some embodiments, the first LL TWT SP is internally configured to enable a master-slave transmission mode, and the first LL TWT SP is externally configured to disable a master-slave transmission mode.

[0150] In some embodiments, when the first link is in the master transmission mode, the second link is in the slave transmission mode, the second AP and / or the second STA do not actively send data on the second link within the time range of the first LL TWT SP, and the second AP and / or the second STA passively performs synchronous transmission according to the transmission on the first link within the time range of the first LL TWT SP.

[0151] In some embodiments, when the first LL TWT SP and the second LL TWT SP have the same start time and end time, and the same LL TWT parameters, the Non-AP MLD does not set the master-slave transmission mode on the first link and the second link, and the Non-AP MLD transmits synchronously on the first LL TWT SP and the second LL TWT SP.

[0152] In some embodiments, when the first LL TWT SP and the second LL TWT SP have the same start time and end time, and the same LL TWT parameters, the AP MLD does not set the master-slave transmission mode on the first link and the second link, and the AP MLD transmits synchronously on the first LL TWT SP and the second LL TWT SP.

[0153] In some embodiments, when a first LL TWT SP is established on the first link and no LL TWT SP is established on the second link, the master-slave transmission mode of the first link is controlled by the first AP and / or the first STA.

[0154] In some embodiments, when a first LL TWT SP is established on the first link and no LL TWT SP is established on the second link, the master-slave transmission mode of the first link is controlled by the first AP instructing the first STA through a trigger frame or a management frame.

[0155] In some embodiments, when a first LL TWT SP is established on the first link and an LL TWT SP is not established on the second link, the master-slave transmission mode of the first link is indicated by the value of a variable in the LL TWT SP module in the first AP; wherein the LL TWT SP module in the first AP includes a first information field and / or a second information field, the variable value in the first information field is used to indicate whether the master-slave transmission mode is turned on, and the variable value in the second information field is used to indicate whether the first link is in the master transmission mode or the slave transmission mode.

[0156] In some embodiments, when a first LL TWT SP is established on the first link and an LL TWT SP is not established on the second link, the master-slave transmission mode of the first link is indicated by the value of a variable in the LL TWT SP module in the first STA; wherein the LL TWT SP module in the first STA includes a third information field and / or a fourth information field, the variable value in the third information field is used to indicate whether the master-slave transmission mode is turned on, and the variable value in the fourth information field is used to indicate that the first link is in the master transmission mode or the slave transmission mode.

[0157] Therefore, in an embodiment of the present application, when a first LL TWT SP is established on the first link and no LL TWT SP is established on the second link, the transmission of low-latency services on the first link can be guaranteed by setting the first link to the master transmission mode and the second link to the slave transmission mode.

[0158] In some embodiments, when a first LL TWT SP is established on the first link and a second LL TWT SP is established on the second link, the first LL TWT SP and the second LL TWT SP do not overlap in the time domain.

[0159] In some embodiments, the first LL TWT SP and the second LL TWT SP do not overlap in time domain and are scheduled by the first AP or the second AP.

[0160] In some embodiments, the first STA requests the first AP to schedule the first LL TWT SP and the second LL TWT SP not overlapping in time domain; or the second STA requests the second AP to schedule the first LL TWT SP and the second LL TWT SP not overlapping in time domain.

[0161] In some embodiments, the first information includes a TWT element, a control field in the TWT element includes at least one reserved bit, and the at least one reserved bit is used to indicate that the first LL TWT SP and the second LL TWT SP do not overlap in the time domain.

[0162] Therefore, in the embodiment of the present application, the first LL TWT SP and the second LL TWT SP do not overlap in the time domain, avoiding the situation where the LL TWT SPs on the two links overlap. Since the NSTR MLD device cannot receive and send at the same time, the low-latency service on a certain link cannot be transmitted within the LL TWT SP.

[0163] In some embodiments, the Non-AP MLD (such as the first STA) ends the TXOP on the first link before the start time of the second LLTWT SP, or the Non-AP MLD (such as the first STA) abandons the TXOP of the first link that is not ended at the start time of the second LLTWT SP.

[0164] For example, when the priority of the service transmitted in the first LL TWT SP is lower than the priority of the service transmitted in the second LL TWT SP, the first STA ends the TXOP on the first link before the start time of the second LL TWT SP, or the first STA abandons the TXOP of the first link that has not ended at the start time of the second LL TWT SP. That is, the first LL TWT SP partially overlaps with the second LL TWT SP in the time domain.

[0165] Therefore, in an embodiment of the present application, the first STA ends the TXOP on the first link before the start time of the second LL TWT SP, or the first STA abandons the TXOP of the first link that has not ended at the start time of the second LL TWT SP, to avoid the situation where the LL TWT SPs on the two links overlap, and the low-latency service on a certain link cannot be transmitted within the LL TWT SP because the NSTR MLD device cannot receive and send at the same time.

[0166] In some embodiments, when the first LL TWT SP and the second LL TWT SP are both trigger-enabled LL TWTSPs, the Non-AP MLD or the AP MLD controls the last scheduled transmission for the first LL TWT SP before the start time of the second LL TWT SP to end before the start time of the second LL TWT SP.

[0167] For example, when the priority of the service transmitted in the first LL TWT SP is lower than the priority of the service transmitted in the second LL TWT SP, and when both the first LL TWT SP and the second LL TWT SP are trigger-enabled LL TWT SPs, the most recent scheduled transmission for the first LL TWT SP before the start time of the second LL TWT SP ends before the start time of the second LL TWT SP. That is, the first LL TWT SP partially overlaps with the second LL TWT SP in the time domain.

[0168] Therefore, in an embodiment of the present application, when the first LL TWT SP and the second LL TWT SP are both trigger-enabled LL TWT SPs, the most recent scheduled transmission for the first LL TWT SP before the start time of the second LL TWT SP ends before the start time of the second LL TWT SP, to avoid overlapping of the LL TWT SPs on the two links. Since the NSTR MLD device cannot receive and send at the same time, the low-latency service on a certain link cannot be transmitted within the LL TWT SP.

[0169] In some embodiments, when the data transmission in the first LL TWT SP ends before the start time of the second LL TWT SP, the Non-AP MLD (eg, the first STA) releases the remaining time of the first LL TWT SP.

[0170] For example, when the priority of the service transmitted in the first LL TWT SP is lower than the priority of the service transmitted in the second LL TWT SP, and when the data transmission in the first LL TWT SP ends before the start time of the second LL TWT SP, the priority of the service transmitted in the first LL TWT SP is lower than the priority of the service transmitted in the second LL TWT SP. That is, the first LL TWT SP partially overlaps with the second LL TWT SP in the time domain.

[0171] Therefore, in an embodiment of the present application, when the data transmission within the first LL TWT SP ends before the start time of the second LL TWT SP, the first STA releases the remaining time of the first LL TWT SP to avoid overlapping of the LL TWT SPs on the two links. Since the NSTR MLD device cannot receive and send at the same time, the low-latency service on a certain link cannot be transmitted within the LL TWT SP.

[0172] This application extends the enhanced TWT mechanism for low-latency services to multi-links, further enhancing the latency performance improvement brought by single-link technology; and, considering the portability, cost and other factors of the site multi-link equipment, the energy saving of the site multi-link equipment is also an important issue to be considered, which coincides with the design content of this application: the primary purpose of this application is to extend the enhanced TWT mechanism to multi-links, so as to provide predictable delay services for latency-sensitive services in multi-links; and the TWT mechanism happens to meet the original needs of Non-AP MLD. Therefore, the application technical solution reduces latency on the one hand, and on the other hand, it complies with the standardization process.

[0173] The scheme of the present application is described in detail below through Examples 1 to 10.

[0174] In Example 1, LL TWT SP is not established on Link 1, and LL TWT SP 2 is established on Link 2. Fig.13 As shown, there is no delay-sensitive service on link 1, and link 2 transmits a certain delay-sensitive service flow in LL TWT SP 2. Before LL TWTSP 2 starts, normal data transmission is performed on link 1. At the start of the LL TWT SP 2 time period, the LL TWT SP management modules in the corresponding attached devices on link 1 and link 2 set corresponding variable values ​​respectively. In the LL TWT SP management modules in the attached AP (i.e., AP2) and attached STA (i.e., STA2) corresponding to link 2, the link transmission mode 0 / 1 variable is set to 1; the link Leader / Follower indicator variable is set to 1. In the LL TWT SP management modules in the attached AP (i.e., AP1) and attached STA (i.e., STA1) corresponding to link 1, the link transmission mode 0 / 1 variable is set to 1; the link Leader / Follower indicator variable is set to 0; AP1 and STA1 can adopt the rule-b channel access rule. When the backoff counter is 0, they remain silent and do not transmit. After waiting for link 2 to start data transmission, the transmission on link 1 and link 2 remain synchronized.

[0175] AP1 and STA1 may adopt rule-b channel access rule, which may be that AP1 and STA1 do not send data or signaling when competing for the channel transmission opportunity, or AP1 and STA1 do not send data or signaling when accessing the channel.

[0176] It should be noted that link 2 in Example 1 can correspond to the above-mentioned first link, that is, AP2 can correspond to the above-mentioned first AP, and STA2 can correspond to the above-mentioned first STA; link 1 can correspond to the above-mentioned second link, that is, AP1 can correspond to the above-mentioned second AP, and STA1 can correspond to the above-mentioned second STA.

[0177] In Example 2, LL TWT SP 1 is established on link 1, and LL TWT SP 2 is established on link 2. Fig.14 As shown in the figure, there is a partial overlap between LL TWT SP 1 and LL TWT SP 2. At the start of LL TWT SP 1, the transmission on link 1 starts normally. At the start of LL TWT SP 2, link 2 is the leader link and link 1 is the follower link. There is no active transmission on link 1. When link 2 performs downlink transmission, link 1 and link 2 perform downlink transmission synchronously.

[0178] In Embodiment 3, LL TWT SP 1 is established on Link 1, and LL TWT SP 2 is established on Link 2. Fig.15 As shown, there is a partial overlap between LL TWT SP 1 and LL TWT SP 2. After LL TWT SP 2 starts, link 2 is the leader link and link 1 is the follower link. Since link 1 has no downlink data after LL TWT SP 2 starts, link 1 is idle during downlink transmission of link 2.

[0179] In an optional implementation of Example 3, since the data transmitted in LL TWT SP 1 is also delay-sensitive data, in this case, after LL TWT SP 2 starts, since link 2 is the leader link and link 1 is the follower link, STA1 cannot transmit its uplink cache in time, which will have a certain impact on system performance. In order to reduce this impact to a certain extent, LL TWT SP 1 can be extended within the limited delay time range of STA1's uplink cache to transmit STA1's uplink cache, such as Fig.16 shown.

[0180] It should be noted that the uplink buffer in the above-mentioned embodiment 3 may also be a downlink buffer. For details, please refer to the relevant description of the uplink buffer, which will not be repeated here.

[0181] In Embodiment 4, LL TWT SP 1 is established on Link 1, and LL TWT SP 2 is established on Link 2. Fig.17As shown, LL TWT SP 1 completely covers LL TWT SP 2, and STA1 holds a TXOP to determine whether the length of the TXOP exceeds the start time of LL TWT SP 2 on link 2. If it exceeds, STA1 shortens the transmission time of the PPDU by adjusting the length of the PPDU or the transmission modulation and coding scheme (MCS), etc., to ensure that the TXOP ends before the LL TWT SP2 is turned on. When STA1 holds a TXOP, if the start time of LL TWT SP 2 on link 2 is close to the current time, STA1 can abandon the TXOP and not transmit. When AP1 holds a downlink TXOP for STA1 transmission, it also needs to perform the same operations as the above STA1.

[0182] In Embodiment 5, LL TWT SP 1 is established on Link 1, and LL TWT SP 2 is established on Link 2. Fig.18 As shown in the figure, there is a partial overlap between LL TWT SP 1 and LL TWT SP 2. The priority of the service transmitted in LL TWT SP 1 is lower than that of the service transmitted in LL TWT SP 2. However, before LL TWT SP 2 starts, the data transmission in LL TWT SP 1 has been completed, and STA1 actively releases its remaining SP time. In this case, during LL TWT SP 2, the LL TWT SP management module corresponding to link 2 sets link 2 as the Leader transmission link, and the LL TWT SP management module corresponding to link 1 is not updated because STA1 is in the doze state, and the transmission of link 2 is not affected.

[0183] It should be noted that the above embodiments are all based on NSTR link pairs (Link Pair) as an example. In practice, NSTRNon-AP MLD devices may have Link1, Link2, and Link3 that are NSTR Link Pairs. The coordinated synchronous transmission scheme designed in this application is also applicable to the above situation. For example, assuming that the service priorities within the LL TWT SP on Link1, Link2, and Link3 are from high to low, using this scheme, Link2 performs synchronous transmission based on Link1, and Link3 performs synchronous transmission based on Link2.

[0184] In Example 6, LL TWT SP 1 is established on link 1, and LL TWT SP 2 is established on link 2. Fig.19As shown, there is no overlapping area between LL TWT SP 1 and LL TWT SP 2. During the LL TWT SP establishment phase, the affiliated STA (STA1 or STA2) on a link in the Non-AP MLD can apply to the AP MLD for allocation of an LL TWT SP that overlaps with the LL TWT SP of another link in the NSTR link pair. Specifically, the TWT element can be used to indicate, for example, the reserved bits B6 and B7 in the control field of the TWT element are used, "01" indicates no overlap at all, "10" indicates complete overlap, and "11" indicates partial overlap. Fig.19 As shown, STA1 in the Non-AP MLD can request LL TWT SP 1 that does not overlap with LL TWT SP 2 on link 2 through frame exchange with AP1.

[0185] In Example 7, LL TWT SP 1 is established on link 1, and LL TWT SP 2 is established on link 2. Fig. 20 As shown in the figure, there is a partial overlap between LL TWT SP 1 and LL TWT SP 2, and the priority of the services transmitted in LL TWT SP 1 is lower than that of the services transmitted in LL TWT SP 2. The LL TWT SPs established on the two links are both trigger-enabled TWT SPs. The uplink and downlink transmissions in LL TWT SP 1 and LL TWT SP 2 are uniformly managed by AP, and STA1 and STA2 are not allowed to access the channel using the EDCA mechanism. Therefore, when starting the most recent scheduled transmission before the start of LL TWT SP 2, AP1 should ensure that the scheduled transmission ends before the start of LL TWT SP 2, as shown in the figure. Fig. 20 Shown in the dashed box.

[0186] In Example 8, LL TWT SP 1 is established on link 1, and LL TWT SP 2 is established on link 2. Fig.21 As shown, there is a partial overlap between LL TWT SP 1 and LL TWT SP 2, and the priority of the service transmitted in LL TWT SP 1 is the same as the priority of the service transmitted in LL TWT SP 2. A preset rule is predefined between STA 1 and AP1, and / or a preset rule is predefined between STA 2 and AP2: the link where the LL TWT SP started earlier is the Leader link. Therefore, Fig.21 In the example, link 1 is configured as the leader link and link 2 is configured as the follower link.

[0187] In Embodiment 9, LL TWT SP 1 is established on Link 1, and LL TWT SP 2 is established on Link 2. Fig. 22 As shown in the figure, there is a partial overlap between LL TWT SP 1 and LL TWT SP 2. When the LL TWT SP is turned on, the subordinate STA cannot compete for the channel, but must wait for the Trigger frame of the subordinate AP. AP MLD determines which Link is the Leader and which Link is the Follower based on the real-time status of the two links; and sends a Trigger frame through the subordinate AP to inform the subordinate STA corresponding to this subordinate AP. This Trigger only serves as a "notification" and does not require an Acknowledgement (ACK) response. If the information contained in the Trigger received by the STA indicates that its Link is the Leader Link, then the STA can immediately use the EDCA mechanism to compete for the channel. Fig. 22 In the case of LL TWT SP 1 being turned on, since STA2 is in sleep mode, Link 1 must be the Leader Link at this time. After receiving this information, STA1 starts to compete for the channel, and starts uplink transmission after successfully competing. Since the uplink PPDU1 exceeds the start time of LL TWT SP2, AP2 should not send a Trigger frame to STA2 at the start time, but should adopt a method such as rule b (rule-b) and wait until Link1 starts downlink transmission before starting to send Trigger frames, in order to avoid OOB problems. If the Trigger frame sent by AP2 is to inform STA2 that Link 2 is the Leader Link at this time, then STA1 should stop channel competition and data transmission, and wait until STA2 starts uplink transmission before synchronizing with it.

[0188] In Embodiment 10, LL TWT SP 1 is established on Link 1, and LL TWT SP 2 is established on Link 2. Fig.23 As shown, there is a partial overlap between LL TWT SP 1 and LL TWT SP 2. AP1 and AP2 inform STA1 and STA2 of the Leader / Follower information through a management frame (Mgmt.Frame) before the start of TWT SP, such as Fig.23 As shown, AP1 and AP2 respectively inform STA1 and STA2 that link 1 is the Leader link and link 2 is the Follower link.

[0189] Combination of the above Figures 10 to 23 , describes in detail the method embodiment of the present application, and the following is combined with Figure 24 to Figure 25, the device embodiments of the present application are described in detail. It should be understood that the device embodiments and the method embodiments correspond to each other, and similar descriptions can refer to the method embodiments.

[0190] Fig.24 A schematic block diagram of a wireless communication device 300 according to an embodiment of the present application is shown. The wireless communication device 300 is applied to a non-access point multi-link device Non-AP MLD, wherein the Non-AP MLD includes at least a first station STA and a second STA, and the first STA forms a first link with a first access point AP in an access point multi-link device AP MLD associated with the first STA, and the second STA forms a second link with a second AP in the AP MLD. Fig.24 As shown, the wireless communication device 300 includes:

[0191] The communication unit 310 is configured to perform data transmission on the first link and the second link when a first low latency target wake-up time service period LLTWT SP is established on the first link.

[0192] In some embodiments, a second LL TWT SP is established on the second link; wherein,

[0193] The first LL TWT SP completely overlaps with the second LL TWT SP in the time domain, or the first LL TWT SP partially overlaps with the second LL TWT SP in the time domain, or the first LL TWT SP does not overlap with the second LL TWT SP in the time domain.

[0194] In some embodiments, the first LL TWT SP and the second LL TWT SP completely overlap or partially overlap in the time domain, and the communication unit 310 is specifically configured to:

[0195] In the case that the first link and the second link of the Non-AP MLD belong to a non-simultaneous transmitting and receiving NSTR link pair, data transmission is performed on the first link and the second link according to the master-slave transmission mode on the first link and the second link.

[0196] In some embodiments, the first LL TWT SP and the second LL TWT SP are internally configured to enable the master-slave transmission mode, and the first LL TWT SP and the second LL TWT SP are externally configured to disable the master-slave transmission mode.

[0197] In some embodiments,

[0198] In the area where the second LL TWT SP overlaps with the first LL TWT SP in the time domain, when the first link is in the master transmission mode, the second link is in the slave transmission mode, the second AP and / or the second STA does not actively send data, and the second AP and / or the second STA passively performs synchronous transmission or stops data transmission and reception according to the transmission on the first link;

[0199] or,

[0200] In the area where the first LL TWT SP and the second LL TWT SP overlap in the time domain, when the first link is in the slave transmission mode, the second link is in the master transmission mode, the first AP and / or the first STA do not actively send data, and the first AP and / or the first STA passively performs synchronous transmission or stops data transmission and reception according to the transmission on the second link;

[0201] or,

[0202] When the first AP and / or the first STA performs data transmission in the first LL TWT SP area, and the second AP and / or the second STA overlaps with the first LL TWT SP in the time domain but is not in the area of ​​the second LL TWT SP, the second AP and / or the second STA does not actively send data, and the second AP and / or the second STA passively performs synchronous transmission or stops data transmission and reception according to the transmission on the first link;

[0203] or,

[0204] When the second AP and / or the second STA transmits data in the second LL TWT SP area, and the first AP and / or the first STA overlap with the second LL TWT SP in the time domain but are not within the area of ​​the first LL TWT SP, the second AP and / or the second STA do not actively send data, and the second AP and / or the second STA passively performs synchronous transmission or stops data transmission and reception according to the transmission on the first link.

[0205] In some embodiments, no LL TWT SP is established on the second link, and the communication unit 310 is specifically configured to:

[0206] In the case that the first link and the second link of the Non-AP MLD belong to an NSTR link pair, data transmission is performed on the first link and the second link according to a master-slave transmission mode on the first link and the second link at least within the time range of the first LL TWT SP.

[0207] In some embodiments, when the first link is in the master transmission mode, the second link is in the slave transmission mode, the second AP and / or the second STA does not actively send data on the second link within the time range of the first LL TWT SP, and the second AP and / or the second STA passively performs synchronous transmission or stops data transmission and reception according to the transmission on the first link within the time range of the first LL TWT SP.

[0208] In some embodiments, the master-slave transmission mode of the first link is controlled by the first AP and / or the first STA, and / or the master-slave transmission mode of the second link is controlled by the second AP and / or the second STA.

[0209] In some embodiments, the master-slave transmission mode of the first link is controlled by the first AP through a trigger frame or a management frame to indicate the first STA, and / or the master-slave transmission mode of the second link is controlled by the second AP through a trigger frame or a management frame to indicate the second STA.

[0210] In some embodiments, the master-slave transmission mode of the first link is indicated by the value of a variable in the LL TWT SP module in the first AP; wherein the LL TWT SP module in the first AP includes a first information field and / or a second information field, the variable value in the first information field is used to indicate whether the master-slave transmission mode is turned on, and the variable value in the second information field is used to indicate whether the first link is in the master transmission mode or the slave transmission mode.

[0211] In some embodiments, the master-slave transmission mode of the first link is indicated by the value of a variable in the LL TWT SP module in the first STA; wherein the LL TWT SP module in the first STA includes a third information field and / or a fourth information field, the variable value in the third information field is used to indicate whether the master-slave transmission mode is turned on, and the variable value in the fourth information field is used to indicate that the first link is in the master transmission mode or the slave transmission mode.

[0212] In some embodiments, the master-slave transmission mode of the second link is indicated by the value of a variable in the LL TWT SP module in the second AP; wherein the LL TWT SP module in the second AP includes a fifth information field and / or a sixth information field, the variable value in the fifth information field is used to indicate whether the master-slave transmission mode is turned on, and the variable value in the sixth information field is used to indicate whether the second link is in the master transmission mode or the slave transmission mode.

[0213] In some embodiments, the master-slave transmission mode of the second link is indicated by the value of a variable in the LL TWT SP module in the second STA; wherein the LL TWT SP module in the second STA includes a seventh information field and / or an eighth information field, the variable value in the seventh information field is used to indicate whether the master-slave transmission mode is turned on, and the variable value in the eighth information field is used to indicate that the second link is in the master transmission mode or the slave transmission mode.

[0214] In some embodiments, the wireless communication device 300 further includes: a processing unit 320, wherein:

[0215] The communication unit 310 is further used to receive first indication information sent by the first AP or the second AP through a trigger frame or a management frame, where the first indication information is used to indicate a transmission mode of the first link;

[0216] The processing unit 320 is configured to set a master-slave transmission mode of the first link according to the first indication information.

[0217] In some embodiments, the transmission mode of the first link is determined based on at least one of the priority of the service transmitted within the first LL TWT SP, the priority of the service transmitted within the second LL TWT SP, the start time of the first LL TWT SP, the start time of the second LL TWT SP, the link status information of the first link, and the link status information of the second link.

[0218] In some embodiments, the transmission mode of the first link and / or the second link is determined according to a preset condition.

[0219] In some embodiments, the preset condition includes:

[0220] In the case where the priority of the service transmitted in the first LL TWT SP is lower than the priority of the service transmitted in the second LL TWT SP, the first link is in a slave transmission mode and the second link is in a master transmission mode;

[0221] In the case where the priority of the service transmitted in the first LL TWT SP is higher than the priority of the service transmitted in the second LL TWT SP, the first link is in the master transmission mode and the second link is in the slave transmission mode;

[0222] When the priority of the service transmitted in the first LL TWT SP is the same as the priority of the service transmitted in the second LL TWT SP, and the start time of the first LL TWT SP is later than the start time of the second LL TWT SP, the first link is in the slave transmission mode and the second link is in the master transmission mode;

[0223] When the priority of the service transmitted within the first LL TWT SP is the same as the priority of the service transmitted within the second LL TWT SP, and the start time of the first LL TWT SP is earlier than the start time of the second LL TWT SP, the first link is in the master transmission mode and the second link is in the slave transmission mode.

[0224] In some embodiments, the preset condition is agreed upon by a protocol, or the preset condition is agreed upon by the first AP and the second AP.

[0225] In some embodiments, the transmission mode of the first link and / or the second link is determined according to the priority of the services transmitted within the first LLTWT SP and the second LLTWT SP.

[0226] In some embodiments, when the priority of the service transmitted in the first LL TWT SP is lower than the priority of the service transmitted in the second LL TWT SP, the first link is in a slave transmission mode and the second link is in a master transmission mode; or,

[0227] In a case where the priority of the service transmitted in the first LL TWT SP is higher than the priority of the service transmitted in the second LL TWT SP, the first link is in the master transmission mode and the second link is in the slave transmission mode.

[0228] In some embodiments, when the priority of the service transmitted within the first LL TWT SP is the same as the priority of the service transmitted within the second LL TWT SP, the transmission mode of the first link and / or the second link is determined based on the start time of the first LL TWT SP and the second LL TWT SP.

[0229] In some embodiments, when the priority of the service transmitted in the first LL TWT SP is the same as the priority of the service transmitted in the second LL TWT SP, and the start time of the first LL TWT SP is later than the start time of the second LL TWT SP, the first link is in the slave transmission mode and the second link is in the master transmission mode; or,

[0230] When the priority of the service transmitted within the first LL TWT SP is the same as the priority of the service transmitted within the second LL TWT SP, and the start time of the first LL TWT SP is earlier than the start time of the second LL TWT SP, the first link is in the master transmission mode and the second link is in the slave transmission mode.

[0231] In some embodiments, when the first LL TWT SP and the second LL TWT SP are both trigger-enabled LL TWTSPs, the master-slave transmission mode of the first link is controlled by the first AP, and / or the master-slave transmission mode of the second link is controlled by the second AP.

[0232] In some embodiments, when the first link is in slave transmission mode and the second link is in master transmission mode, and the first STA cannot upload the uplink cache in time, the service period of the first LL TWT SP is configured to be extended to at least cover the uplink cache-restricted area of ​​the first STA.

[0233] In some embodiments, when the first link is in slave transmission mode and the second link is in master transmission mode, and the first STA cannot upload the downlink cache in time, the service period of the first LL TWT SP is configured to be extended to at least cover the area where the downlink cache of the first STA is limited.

[0234] In some embodiments, the communication unit 310 is specifically used to:

[0235] When the first LL TWT SP and the second LL TWT SP have the same start time and end time, and the same LL TWT parameters, the master-slave transmission mode is not set on the first link and the second link, and the first LL TWT SP and the second LL TWT SP are transmitted synchronously.

[0236] In some embodiments, the first LL TWT SP and the second LL TWT SP partially overlap in the time domain, and the wireless communication device 300 further includes: a processing unit 320, wherein:

[0237] When the first link is in slave transmission mode, the second link is in master transmission mode, and data transmission in the first LL TWT SP ends before the start time of the second LL TWT SP, the processing unit 320 is used to release the remaining service time of the first LL TWT SP.

[0238] In some embodiments, the first LL TWT SP and the second LL TWT SP do not overlap in the time domain, and the first LL TWT SP and the second LL TWT SP do not overlap in the time domain and are scheduled by the first AP or the second AP.

[0239] In some embodiments, the first STA requests the first AP to schedule that the first LL TWT SP and the second LL TWT SP do not overlap in the time domain; or,

[0240] The first LL TWT SP and the second LL TWT SP do not overlap in the time domain and are scheduled by the second AP requested by the second STA.

[0241] In some embodiments, the non-overlapping of the first LL TWT SP and the second LL TWT SP in the time domain is indicated by at least one reserved bit in the control field in the target wake-up time TWT element.

[0242] In some embodiments, the first LL TWT SP and the second LL TWT SP partially overlap in the time domain, and the wireless communication device 300 further includes: a processing unit 320, wherein:

[0243] The processing unit 320 is configured to end the transmission opportunity TXOP on the first link before the start time of the second LL TWT SP, or the processing unit 320 is configured to abandon the TXOP of the first link that has not ended at the start time of the second LL TWT SP.

[0244] In some embodiments, when the first LL TWT SP and the second LL TWT SP are both trigger-enabled LL TWTSPs, the most recently scheduled transmission for the first LL TWT SP before the start time of the second LL TWT SP ends before the start time of the second LL TWT SP.

[0245] In some embodiments, the first LL TWT SP and the second LL TWT SP partially overlap in the time domain, and the wireless communication device 300 further includes: a processing unit 320, wherein:

[0246] In a case where the data transmission in the first LL TWT SP ends before the start time of the second LL TWT SP, the processing unit 320 is configured to release the remaining time of the first LL TWT SP.

[0247] In some embodiments, the priority of the traffic transmitted within the first LL TWT SP is lower than the priority of the traffic transmitted within the second LL TWT SP.

[0248] In some embodiments, the communication unit may be a communication interface or a transceiver, or an input / output interface of a communication chip or a system on chip. The processing unit may be one or more processors.

[0249] It should be understood that the wireless communication device 300 according to the embodiment of the present application may correspond to the Non-AP MLD in the method embodiment of the present application, and the above and other operations and / or functions of each unit in the wireless communication device 300 are respectively to achieve Fig.10 The corresponding process of the Non-AP MLD in the wireless communication method 200 is not described here for brevity.

[0250] Fig.25 A schematic block diagram of a wireless communication device 400 according to an embodiment of the present application is shown. The wireless communication device 400 is applied to an access point multi-link device AP MLD, wherein the AP MLD includes at least a first access point AP and a second AP, and the first AP forms a first link with a first station STA in a non-access point multi-link device Non-AP MLD associated with the first AP, and the second AP forms a second link with a second STA in the Non-AP MLD. Fig.25 As shown, the wireless communication device 400 includes:

[0251] The communication unit 410 is configured to perform data transmission on the first link and the second link when a first low latency target wake-up time service period LLTWT SP is established on the first link.

[0252] In some embodiments, a second LL TWT SP is established on the second link; wherein,

[0253] The first LL TWT SP completely overlaps with the second LL TWT SP in the time domain, or the first LL TWT SP partially overlaps with the second LL TWT SP in the time domain, or the first LL TWT SP does not overlap with the second LL TWT SP in the time domain.

[0254] In some embodiments, the first LL TWT SP and the second LL TWT SP completely overlap or partially overlap in the time domain, and the communication unit 410 is specifically configured to:

[0255] In the case that the first link and the second link of the Non-AP MLD belong to a non-simultaneous transmitting and receiving NSTR link pair, data transmission is performed on the first link and the second link according to the master-slave transmission mode on the first link and the second link.

[0256] In some embodiments, the master-slave transmission mode is enabled within the first LL TWT SP and the second LL TWT SP, and the master-slave transmission mode is disabled outside the first LL TWT SP and the second LL TWT SP.

[0257] In some embodiments,

[0258] In the area where the second LL TWT SP overlaps with the first LL TWT SP in the time domain, when the first link is in the master transmission mode, the second link is in the slave transmission mode, the second AP and / or the second STA does not actively send data, and the second AP and / or the second STA passively performs synchronous transmission or stops data transmission and reception according to the transmission on the first link;

[0259] or,

[0260] In the area where the first LL TWT SP and the second LL TWT SP overlap in the time domain, when the first link is in the slave transmission mode, the second link is in the master transmission mode, the first AP and / or the first STA do not actively send data, and the first AP and / or the first STA passively performs synchronous transmission or stops data transmission and reception according to the transmission on the second link

[0261] or,

[0262] When the first AP and / or the first STA performs data transmission in the first LL TWT SP area, and the second AP and / or the second STA overlaps with the first LL TWT SP in the time domain but is not in the area of ​​the second LL TWT SP, the second AP and / or the second STA does not actively send data, and the second AP and / or the second STA passively performs synchronous transmission or stops data transmission and reception according to the transmission on the first link;

[0263] or,

[0264] When the second AP and / or the second STA transmits data in the second LL TWT SP area, and the first AP and / or the first STA overlap with the second LL TWT SP in the time domain but are not within the area of ​​the first LL TWT SP, the second AP and / or the second STA do not actively send data, and the second AP and / or the second STA passively performs synchronous transmission or stops data transmission and reception according to the transmission on the first link.

[0265] In some embodiments, no LL TWT SP is established on the second link, and the communication unit 410 is specifically configured to:

[0266] In the case that the first link and the second link of the Non-AP MLD belong to an NSTR link pair, data transmission is performed on the first link and the second link according to a master-slave transmission mode on the first link and the second link at least within the time range of the first LL TWT SP.

[0267] In some embodiments, when the first link is in the master transmission mode, the second link is in the slave transmission mode, the second AP and / or the second STA does not actively send data on the second link within the time range of the first LL TWT SP, and the second AP and / or the second STA passively performs synchronous transmission or stops data transmission and reception according to the transmission on the first link within the time range of the first LL TWT SP.

[0268] In some embodiments, the master-slave transmission mode of the first link is controlled by the first AP and / or the first STA, and / or the master-slave transmission mode of the second link is controlled by the second AP and / or the second STA.

[0269] In some embodiments, the master-slave transmission mode of the first link is controlled by the first AP through a trigger frame or a management frame to indicate the first STA, and / or the master-slave transmission mode of the second link is controlled by the second AP through a trigger frame or a management frame to indicate the second STA.

[0270] In some embodiments, the master-slave transmission mode of the first link is indicated by the value of a variable in the LL TWT SP module in the first AP; wherein the LL TWT SP module in the first AP includes a first information field and / or a second information field, the variable value in the first information field is used to indicate whether the master-slave transmission mode is turned on, and the variable value in the second information field is used to indicate whether the first link is in the master transmission mode or the slave transmission mode.

[0271] In some embodiments, the master-slave transmission mode of the first link is indicated by the value of a variable in the LL TWT SP module in the first STA; wherein the LL TWT SP module in the first STA includes a third information field and / or a fourth information field, the variable value in the third information field is used to indicate whether the master-slave transmission mode is turned on, and the variable value in the fourth information field is used to indicate that the first link is in the master transmission mode or the slave transmission mode.

[0272] In some embodiments, the master-slave transmission mode of the second link is indicated by the value of a variable in the LL TWT SP module in the second AP; wherein the LL TWT SP module in the second AP includes a fifth information field and / or a sixth information field, the variable value in the fifth information field is used to indicate whether the master-slave transmission mode is turned on, and the variable value in the sixth information field is used to indicate whether the second link is in the master transmission mode or the slave transmission mode.

[0273] In some embodiments, the master-slave transmission mode of the second link is indicated by the value of a variable in the LL TWT SP module in the second STA; wherein the LL TWT SP module in the second STA includes a seventh information field and / or an eighth information field, the variable value in the seventh information field is used to indicate whether the master-slave transmission mode is turned on, and the variable value in the eighth information field is used to indicate that the second link is in the master transmission mode or the slave transmission mode.

[0274] In some embodiments, the wireless communication device 400 further includes: a processing unit 420, wherein:

[0275] The processing unit 420 is used to determine the transmission mode of the first link based on at least one of the priority of the service transmitted within the first LL TWT SP, the priority of the service transmitted within the second LL TWTSP, the start time of the first LL TWT SP, the start time of the second LL TWT SP, the link status information of the first link, and the link status information of the second link.

[0276] In some embodiments, the communication unit 410 is further configured to send first indication information to the NON-AP MLD via a trigger frame or a management frame, where the first indication information is used to indicate a transmission mode of the first link.

[0277] In some embodiments, the transmission mode of the first link and / or the second link is determined according to a preset condition.

[0278] In some embodiments, the preset condition includes:

[0279] In the case where the priority of the service transmitted in the first LL TWT SP is lower than the priority of the service transmitted in the second LL TWT SP, the first link is in a slave transmission mode and the second link is in a master transmission mode;

[0280] In the case where the priority of the service transmitted in the first LL TWT SP is higher than the priority of the service transmitted in the second LL TWT SP, the first link is in the master transmission mode and the second link is in the slave transmission mode;

[0281] When the priority of the service transmitted in the first LL TWT SP is the same as the priority of the service transmitted in the second LL TWT SP, and the start time of the first LL TWT SP is later than the start time of the second LL TWT SP, the first link is in the slave transmission mode and the second link is in the master transmission mode;

[0282] When the priority of the service transmitted within the first LL TWT SP is the same as the priority of the service transmitted within the second LL TWT SP, and the start time of the first LL TWT SP is earlier than the start time of the second LL TWT SP, the first link is in the master transmission mode and the second link is in the slave transmission mode.

[0283] In some embodiments, the preset condition is agreed upon by a protocol, or the preset condition is agreed upon by the first AP and the second AP.

[0284] In some embodiments, the transmission mode of the first link and / or the second link is determined according to the priority of the services transmitted within the first LLTWT SP and the second LLTWT SP.

[0285] In some embodiments, when the priority of the service transmitted in the first LL TWT SP is lower than the priority of the service transmitted in the second LL TWT SP, the first link is in a slave transmission mode and the second link is in a master transmission mode; or,

[0286] In a case where the priority of the service transmitted in the first LL TWT SP is higher than the priority of the service transmitted in the second LL TWT SP, the first link is in the master transmission mode and the second link is in the slave transmission mode.

[0287] In some embodiments, when the priority of the service transmitted within the first LL TWT SP is the same as the priority of the service transmitted within the second LL TWT SP, the transmission mode of the first link and / or the second link is determined based on the start time of the first LL TWT SP and the second LL TWT SP.

[0288] In some embodiments, when the priority of the service transmitted in the first LL TWT SP is the same as the priority of the service transmitted in the second LL TWT SP, and the start time of the first LL TWT SP is later than the start time of the second LL TWT SP, the first link is in the slave transmission mode and the second link is in the master transmission mode; or,

[0289] When the priority of the service transmitted within the first LL TWT SP is the same as the priority of the service transmitted within the second LL TWT SP, and the start time of the first LL TWT SP is earlier than the start time of the second LL TWT SP, the first link is in the master transmission mode and the second link is in the slave transmission mode.

[0290] In some embodiments, when the first LL TWT SP and the second LL TWT SP are both trigger-enabled LL TWTSPs, the master-slave transmission mode of the first link is controlled by the first AP, and / or the master-slave transmission mode of the second link is controlled by the second AP.

[0291] In some embodiments, when the first link is in slave transmission mode and the second link is in master transmission mode, and the first STA cannot upload the uplink cache in time, the service period of the first LL TWT SP is configured to be extended to at least cover the uplink cache-restricted area of ​​the first STA.

[0292] In some embodiments, when the first link is in slave transmission mode and the second link is in master transmission mode, and the first STA cannot upload the downlink cache in time, the service period of the first LL TWT SP is configured to be extended to at least cover the area where the downlink cache of the first STA is limited.

[0293] In some embodiments, the communication unit 410 is specifically used for:

[0294] When the first LL TWT SP and the second LL TWT SP have the same start time and end time, and the same LL TWT parameters, the master-slave transmission mode is not set on the first link and the second link, and the first LL TWT SP and the second LL TWT SP are transmitted synchronously.

[0295] In some embodiments, the first LL TWT SP and the second LL TWT SP do not overlap in the time domain.

[0296] In some embodiments, the first LL TWT SP and the second LL TWT SP do not overlap in time domain and are scheduled by the first AP or the second AP.

[0297] In some embodiments, the first STA requests the first AP to schedule that the first LL TWT SP and the second LL TWT SP do not overlap in the time domain; or,

[0298] The first LL TWT SP and the second LL TWT SP do not overlap in the time domain and are scheduled by the second AP requested by the second STA.

[0299] In some embodiments, the non-overlapping of the first LL TWT SP and the second LL TWT SP in the time domain is indicated by at least one reserved bit in the control field in the target wake-up time TWT element.

[0300] In some embodiments, the first LL TWT SP partially overlaps with the second LL TWT SP in the time domain.

[0301] When both the first LL TWT SP and the second LL TWT SP are trigger-enabled LL TWT SPs, the processing unit 420 is configured to end the most recent scheduled transmission for the first LL TWT SP before the start time of the second LL TWT SP before the start time of the second LL TWT SP.

[0302] In some embodiments, the priority of the traffic transmitted within the first LL TWT SP is lower than the priority of the traffic transmitted within the second LL TWT SP.

[0303] In some embodiments, the communication unit may be a communication interface or a transceiver, or an input / output interface of a communication chip or a system on chip. The processing unit may be one or more processors.

[0304] It should be understood that the wireless communication device 400 according to the embodiment of the present application may correspond to the AP MLD in the method embodiment of the present application, and the above and other operations and / or functions of each unit in the wireless communication device 400 are respectively to implement Fig.10 The corresponding process of AP MLD in the wireless communication method 200 is not described in detail here for the sake of brevity.

[0305] Fig.26 It is a schematic structural diagram of a communication device 500 provided in an embodiment of the present application. Fig.26 The communication device 500 shown includes a processor 510, and the processor 510 can call and run a computer program from a memory to implement the method in the embodiment of the present application.

[0306] In some embodiments, Fig.26 As shown, the communication device 500 may further include a memory 520. The processor 510 may call and run a computer program from the memory 520 to implement the method in the embodiment of the present application.

[0307] The memory 520 may be a separate device independent of the processor 510 , or may be integrated into the processor 510 .

[0308] In some embodiments, Fig.26 As shown, the communication device 500 may further include a transceiver 530, and the processor 510 may control the transceiver 530 to communicate with other devices, specifically, may send information or data to other devices, or receive information or data sent by other devices.

[0309] The transceiver 530 may include a transmitter and a receiver. The transceiver 530 may further include an antenna, and the number of the antennas may be one or more.

[0310] In some embodiments, the communication device 500 may specifically be the Non-AP MLD of the embodiment of the present application, and the communication device 500 may implement the corresponding processes implemented by the Non-AP MLD in each method of the embodiment of the present application, which will not be described in detail for the sake of brevity.

[0311] In some embodiments, the communication device 500 may specifically be the AP MLD of the embodiment of the present application, and the communication device 500 may implement the corresponding processes implemented by the AP MLD in each method of the embodiment of the present application, which will not be described in detail here for the sake of brevity.

[0312] Fig. 27 It is a schematic structural diagram of the device of an embodiment of the present application. Fig. 27 The device 600 shown includes a processor 610, which can call and run a computer program from a memory to implement the method in the embodiment of the present application.

[0313] In some embodiments, Fig. 27 As shown, the apparatus 600 may further include a memory 620. The processor 610 may call and run a computer program from the memory 620 to implement the method in the embodiment of the present application.

[0314] The memory 620 may be a separate device independent of the processor 610 , or may be integrated into the processor 610 .

[0315] In some embodiments, the apparatus 600 may further include an input interface 630. The processor 610 may control the input interface 630 to communicate with other devices or chips, and specifically, may obtain information or data sent by other devices or chips.

[0316] In some embodiments, the apparatus 600 may further include an output interface 640. The processor 610 may control the output interface 640 to communicate with other devices or chips, and specifically, may output information or data to other devices or chips.

[0317] In some embodiments, the device can be applied to the Non-AP MLD in the embodiments of the present application, and the device can implement the corresponding processes implemented by the Non-AP MLD in each method of the embodiments of the present application, which will not be described in detail here for the sake of brevity.

[0318] In some embodiments, the device can be applied to the AP MLD in the embodiments of the present application, and the device can implement the corresponding processes implemented by the AP MLD in each method of the embodiments of the present application, which will not be described in detail here for the sake of brevity.

[0319] In some embodiments, the device mentioned in the embodiments of the present application may also be a chip, for example, a system-on-chip, a system-on-chip, a chip system, or a system-on-chip chip.

[0320] Fig.28 is a schematic block diagram of a communication system 700 provided in an embodiment of the present application. Fig.28 As shown, the communication system 700 includes a Non-AP MLD 710 and an AP MLD 720 .

[0321] The Non-AP MLD 710 may be used to implement the corresponding functions implemented by the Non-AP MLD in the above method, and the AP MLD 720 may be used to implement the corresponding functions implemented by the AP MLD in the above method, which will not be described in detail for the sake of brevity.

[0322] It should be understood that the processor of the embodiment of the present application may be an integrated circuit chip with signal processing capabilities. In the implementation process, each step of the above method embodiment can be completed by the hardware integrated logic circuit or software instructions in the processor. The above processor can be a general processor, a digital signal processor (Digital Signal Processor, DSP), an application-specific integrated circuit (Application Specific Integrated Circuit, ASIC), a field programmable gate array (Field Programmable Gate Array, FPGA) or other programmable logic devices, discrete gates or transistor logic devices, discrete hardware components. The methods, steps and logic block diagrams disclosed in the embodiments of the present application can be implemented or executed. The general processor can be a microprocessor or the processor can also be any conventional processor. The steps of the method disclosed in the embodiment of the present application can be directly embodied as a hardware decoding processor to perform, or the hardware and software modules in the decoding processor are combined and performed. The software module can be located in a random access memory, a flash memory, a read-only memory, a programmable read-only memory or an electrically erasable programmable memory, a register, and other mature storage media in the art. The storage medium is located in the memory, and the processor reads the information in the memory and completes the steps of the above method in combination with its hardware.

[0323] It can be understood that the memory in the embodiments of the present application can be a volatile memory or a non-volatile memory, or can include both volatile and non-volatile memories. Among them, the non-volatile memory can be a read-only memory (ROM), a programmable read-only memory (PROM), an erasable programmable read-only memory (EPROM), an electrically erasable programmable read-only memory (EEPROM), or a flash memory. The volatile memory can be a random access memory (RAM), which is used as an external cache. By way of example and not limitation, many forms of RAM are available, such as static random access memory (SRAM), dynamic random access memory (DRAM), synchronous dynamic random access memory (SDRAM), double data rate synchronous dynamic random access memory (DDR SDRAM), enhanced synchronous dynamic random access memory (ESDRAM), synchronous link dynamic random access memory (SLDRAM), and direct RAM bus random access memory (DR RAM). It should be noted that the memory of the systems and methods described herein is intended to include, but is not limited to, these and any other suitable types of memory.

[0324] It should be understood that the above-mentioned memory is exemplary but not restrictive. For example, the memory in the embodiments of the present application may also be static random access memory (static RAM, SRAM), dynamic random access memory (dynamic RAM, DRAM), synchronous dynamic random access memory (synchronous DRAM, SDRAM), double data rate synchronous dynamic random access memory (double data rate SDRAM, DDR SDRAM), enhanced synchronous dynamic random access memory (enhanced SDRAM, ESDRAM), synchronous link dynamic random access memory (synch link DRAM, SLDRAM) and direct memory bus random access memory (Direct Rambus RAM, DR RAM), etc. That is to say, the memory in the embodiments of the present application is intended to include but not limited to these and any other suitable types of memory.

[0325] An embodiment of the present application also provides a computer-readable storage medium for storing a computer program.

[0326] In some embodiments, the computer-readable storage medium can be applied to the access point device in the embodiments of the present application, and the computer program enables the computer to execute the corresponding processes implemented by the access point device in each method of the embodiments of the present application, which will not be described in detail here for the sake of brevity.

[0327] In some embodiments, the computer-readable storage medium can be applied to the site device in the embodiments of the present application, and the computer program enables the computer to execute the corresponding processes implemented by the site device in the various methods of the embodiments of the present application. For the sake of brevity, they are not repeated here.

[0328] An embodiment of the present application also provides a computer program product, including computer program instructions.

[0329] In some embodiments, the computer program product can be applied to the access point device in the embodiments of the present application, and the computer program instructions enable the computer to execute the corresponding processes implemented by the access point device in the various methods of the embodiments of the present application, which will not be repeated here for the sake of brevity.

[0330] In some embodiments, the computer program product can be applied to the site device in the embodiments of the present application, and the computer program instructions enable the computer to execute the corresponding processes implemented by the site device in the various methods of the embodiments of the present application. For the sake of brevity, they are not repeated here.

[0331] The embodiment of the present application also provides a computer program.

[0332] In some embodiments, the computer program can be applied to the access point device in the embodiments of the present application. When the computer program runs on a computer, the computer executes the corresponding processes implemented by the access point device in the various methods of the embodiments of the present application. For the sake of brevity, they are not repeated here.

[0333] In some embodiments, the computer program can be applied to the site device in the embodiments of the present application. When the computer program runs on a computer, the computer executes the corresponding processes implemented by the site device in the various methods of the embodiments of the present application. For the sake of brevity, they are not repeated here.

[0334] Those of ordinary skill in the art will appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of this application.

[0335] Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working processes of the systems, devices and units described above can refer to the corresponding processes in the aforementioned method embodiments and will not be repeated here.

[0336] In the several embodiments provided in the present application, it should be understood that the disclosed systems, devices and methods can be implemented in other ways. For example, the device embodiments described above are only schematic. For example, the division of the units is only a logical function division. There may be other division methods in actual implementation, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms.

[0337] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0338] In addition, each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.

[0339] If the functions are implemented in the form of software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium. In view of such an understanding, the technical solution of the present application can be embodied in the form of a software product in essence or in other words, the part that contributes to the prior art or the part of the technical solution. The computer software product is stored in a storage medium, including several instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the method described in each embodiment of the present application. The aforementioned storage medium includes: various media that can store program codes, such as a USB flash drive, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk.

[0340] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. A wireless communication method, characterized in that: Applicable to a non-access point multi-link device Non-AP MLD, the Non-AP MLD at least includes a first station STA and a second STA, and the first STA forms a first link with a first access point AP in an access point multi-link device AP MLD associated with it, and the second STA forms a second link with a second AP in the AP MLD; The method comprises: In a case where a first low latency target wake-up time service period LL TWT SP is established on the first link, the Non-AP MLD performs data transmission on the first link and the second link; A second LL TWT SP is established on the second link; the first LL TWT SP and the second LL TWT SP completely overlap in the time domain.

2. The method according to claim 1, characterized in that The first LL TWT SP and the second LL TWT are aligned with each other in the time domain.

3. The method according to claim 2, characterized in that When a second LL TWT SP is established on the second link, the Non-AP MLD performs data transmission on the first link and the second link, including: In the case that the first link and the second link of the Non-AP MLD belong to a non-simultaneous transmitting and receiving NSTR link pair, the Non-AP MLD performs data transmission on the first link and the second link according to a master-slave transmission mode on the first link and the second link.

4. The method according to claim 3, characterized in that In the case where a second LL TWT SP is established on the second link; In the area where the second LL TWT SP overlaps with the first LL TWT SP in the time domain, when the first link is in the master transmission mode, the second link is in the slave transmission mode, the second AP and / or the second STA does not actively send data, and the second AP and / or the second STA passively performs synchronous transmission or stops data transmission and reception according to the transmission on the first link; or, In the area where the first LL TWT SP and the second LL TWT SP overlap in the time domain, when the first link is in the slave transmission mode, the second link is in the master transmission mode, the first AP and / or the first STA do not actively send data, and the first AP and / or the first STA passively performs synchronous transmission or stops data transmission and reception according to the transmission on the second link.

5. The method according to claim 1, characterized in that When the LL TWT SP is not established on the second link, the Non-AP MLD performs data transmission on the first link and the second link, including: In the case that the first link and the second link of the Non-AP MLD belong to an NSTR link pair, the Non-AP MLD performs data transmission on the first link and the second link according to the master-slave transmission mode on the first link and the second link at least within the time range of the first LL TWT SP.

6. The method according to claim 5, characterized in that In the case where LL TWT SP is not established on the second link; When the first link is in the master transmission mode, the second link is in the slave transmission mode, the second AP and / or the second STA does not actively send data on the second link within the time range of the first LL TWT SP, and the second AP and / or the second STA passively performs synchronous transmission or stops data transmission and reception according to the transmission on the first link within the time range of the first LL TWT SP.

7. The method according to any one of claims 3 to 6, characterized in that The master-slave transmission mode of the first link is controlled by the first AP and / or the first STA, and / or the master-slave transmission mode of the second link is controlled by the second AP and / or the second STA.

8. The method according to any one of claims 3 to 6, characterized in that The master-slave transmission mode of the first link is controlled by the first AP through a trigger frame or a management frame to indicate the first STA, and / or the master-slave transmission mode of the second link is controlled by the second AP through a trigger frame or a management frame to indicate the second STA.

9. The method according to any one of claims 3 to 6, characterized in that The master-slave transmission mode of the first link is indicated by the value of the variable in the LL TWT SP module in the first AP; wherein, the LL TWT SP module in the first AP includes a first information domain and / or a second information domain, the variable value in the first information domain is used to indicate whether the master-slave transmission mode is turned on, and the variable value in the second information domain is used to indicate that the first link is in the master transmission mode or the slave transmission mode.

10. The method according to any one of claims 3 to 6, characterized in that The master-slave transmission mode of the first link is indicated by the value of the variable in the LL TWT SP module in the first STA; wherein the LL TWT SP module in the first STA includes a third information field and / or a fourth information field, the variable value in the third information field is used to indicate whether the master-slave transmission mode is turned on, and the variable value in the fourth information field is used to indicate that the first link is in the master transmission mode or the slave transmission mode.

11. The method according to any one of claims 3 to 6, characterized in that The master-slave transmission mode of the second link is indicated by the value of the variable in the LL TWT SP module in the second AP; wherein, the LL TWT SP module in the second AP includes a fifth information field and / or a sixth information field, the variable value in the fifth information field is used to indicate whether the master-slave transmission mode is turned on, and the variable value in the sixth information field is used to indicate that the second link is in the master transmission mode or the slave transmission mode.

12. The method according to any one of claims 3 to 6, characterized in that The master-slave transmission mode of the second link is indicated by the value of the variable in the LL TWT SP module in the second STA; wherein the LL TWT SP module in the second STA includes a seventh information field and / or an eighth information field, the variable value in the seventh information field is used to indicate whether the master-slave transmission mode is turned on, and the variable value in the eighth information field is used to indicate that the second link is in the master transmission mode or the slave transmission mode.

13. The method according to any one of claims 3 to 6, characterized in that The method further comprises: The Non-AP MLD receives first indication information sent by the first AP or the second AP through a trigger frame or a management frame, where the first indication information is used to indicate a transmission mode of the first link; The Non-AP MLD sets a master-slave transmission mode of the first link according to the first indication information.

14. The method according to claim 13, characterized in that The transmission mode of the first link is determined based on at least one of the priority of the service transmitted within the first LL TWT SP, the priority of the service transmitted within the second LL TWT SP, the start time of the first LL TWT SP, the start time of the second LL TWT SP, the link status information of the first link, and the link status information of the second link.

15. The method according to claim 3 or 4, characterized in that The transmission mode of the first link and / or the second link is determined according to a preset condition.

16. The method according to claim 15, characterized in that The preset conditions include: In a case where the priority of the service transmitted in the first LL TWT SP is lower than the priority of the service transmitted in the second LL TWT SP, the first link is in a slave transmission mode and the second link is in a master transmission mode; In a case where the priority of the service transmitted in the first LL TWT SP is higher than the priority of the service transmitted in the second LL TWT SP, the first link is in a master transmission mode and the second link is in a slave transmission mode; When the priority of the service transmitted in the first LL TWT SP is the same as the priority of the service transmitted in the second LL TWT SP, and the start time of the first LL TWT SP is later than the start time of the second LL TWT SP, the first link is in a slave transmission mode and the second link is in a master transmission mode; When the priority of the service transmitted within the first LL TWT SP is the same as the priority of the service transmitted within the second LL TWT SP, and the start time of the first LL TWT SP is earlier than the start time of the second LL TWT SP, the first link is in the master transmission mode and the second link is in the slave transmission mode.

17. The method according to claim 15, characterized in that The preset condition is agreed upon by a protocol, or the preset condition is agreed upon by the first AP and the second AP.

18. The method according to claim 3 or 4, characterized in that The transmission mode of the first link and / or the second link is determined according to the priority of the services transmitted within the first LL TWT SP and the second LL TWT SP.

19. The method according to claim 18, characterized in that In the case where the priority of the service transmitted in the first LL TWT SP is lower than the priority of the service transmitted in the second LL TWT SP, the first link is in a slave transmission mode and the second link is in a master transmission mode; or, In a case where the priority of the service transmitted within the first LL TWT SP is higher than the priority of the service transmitted within the second LL TWT SP, the first link is in the master transmission mode and the second link is in the slave transmission mode.

20. The method according to claim 3 or 4, characterized in that When the priority of the service transmitted within the first LL TWT SP is the same as the priority of the service transmitted within the second LL TWT SP, the transmission mode of the first link and / or the second link is determined according to the start time of the first LL TWT SP and the second LL TWT SP.

21. The method of claim 20, wherein: When the priority of the service transmitted in the first LL TWT SP is the same as the priority of the service transmitted in the second LL TWT SP, and the start time of the first LL TWT SP is later than the start time of the second LL TWT SP, the first link is in a slave transmission mode and the second link is in a master transmission mode; or, When the priority of the service transmitted within the first LL TWT SP is the same as the priority of the service transmitted within the second LL TWT SP, and the start time of the first LL TWT SP is earlier than the start time of the second LL TWT SP, the first link is in the master transmission mode and the second link is in the slave transmission mode.

22. The method according to claim 3 or 4, characterized in that In the case where both the first LL TWT SP and the second LL TWT SP are trigger-enabled LL TWT SPs, the master-slave transmission mode of the first link is controlled by the first AP, and / or the master-slave transmission mode of the second link is controlled by the second AP.

23. The method according to any one of claims 3 to 6, characterized in that In the case where the first link is in a slave transmission mode and the second link is in a master transmission mode, and the first STA cannot upload the uplink buffer in time, the service period of the first LL TWT SP is configured to be extended to at least cover the area where the uplink buffer of the first STA is limited; or, When the first link is in slave transmission mode and the second link is in master transmission mode, and the first STA cannot upload the downlink buffer in time, the service period of the first LL TWT SP is configured to be extended to at least cover the area where the downlink buffer of the first STA is limited.

24. The method of claim 2, wherein: The Non-AP MLD performs data transmission on the first link and the second link, including: When the first LL TWT SP and the second LL TWT SP have the same start time and end time, and the same LL TWT parameters, the Non-AP MLD does not set the master-slave transmission mode on the first link and the second link, and the Non-AP MLD transmits synchronously on the first LL TWT SP and the second LL TWT SP.

25. A method of wireless communication, characterized in that: Applied to an access point multi-link device APMLD, the AP MLD includes at least a first access point AP and a second AP, and the first AP forms a first link with a first station STA in a non-access point multi-link device Non-AP MLD associated with the first AP, and the second AP forms a second link with a second STA in the Non-AP MLD; The method comprises: In a case where a first low latency target wake-up time service period LL TWT SP is established on the first link, the AP MLD performs data transmission on the first link and the second link; A second LL TWT SP is established on the second link; The first LL TWT SP and the second LL TWT SP completely overlap in the time domain.

26. The method of claim 25, wherein: The first LL TWT SP and the second LL TWT SP are aligned with each other in the time domain.

27. The method of claim 26, wherein: When a second LL TWT SP is established on the second link, the AP MLD performs data transmission on the first link and the second link, including: In the case that the first link and the second link of the Non-AP MLD belong to a non-simultaneous transmitting and receiving NSTR link pair, the AP MLD performs data transmission on the first link and the second link according to a master-slave transmission mode on the first link and the second link.

28. The method of claim 27, wherein: In the case where a second LL TWT SP is established on the second link; In the area where the second LL TWT SP overlaps with the first LL TWT SP in the time domain, when the first link is in the master transmission mode, the second link is in the slave transmission mode, the second AP and / or the second STA does not actively send data, and the second AP and / or the second STA passively performs synchronous transmission or stops data transmission and reception according to the transmission on the first link; or, In the area where the first LL TWT SP and the second LL TWT SP overlap in the time domain, when the first link is in the slave transmission mode, the second link is in the master transmission mode, the first AP and / or the first STA do not actively send data, and the first AP and / or the first STA passively performs synchronous transmission or stops data transmission and reception according to the transmission on the second link.

29. The method of claim 25, wherein: When the LL TWT SP is not established on the second link, the AP MLD performs data transmission on the first link and the second link, including: In the case where the first link and the second link of the Non-AP MLD belong to an NSTR link pair, the APMLD performs data transmission on the first link and the second link according to the master-slave transmission mode on the first link and the second link at least within the time range of the first LL TWT SP.

30. The method of claim 29, wherein: In the case where LL TWT SP is not established on the second link; When the first link is in the master transmission mode, the second link is in the slave transmission mode, the second AP and / or the second STA does not actively send data on the second link within the time range of the first LL TWT SP, and the second AP and / or the second STA passively performs synchronous transmission or stops data transmission and reception according to the transmission on the first link within the time range of the first LL TWT SP.

31. The method according to any one of claims 27 to 30, characterized in that The master-slave transmission mode of the first link is controlled by the first AP and / or the first STA, and / or the master-slave transmission mode of the second link is controlled by the second AP and / or the second STA.

32. The method according to any one of claims 27 to 30, characterized in that The master-slave transmission mode of the first link is controlled by the first AP through a trigger frame or a management frame to indicate the first STA, and / or the master-slave transmission mode of the second link is controlled by the second AP through a trigger frame or a management frame to indicate the second STA.

33. The method according to any one of claims 27 to 30, characterized in that The master-slave transmission mode of the first link is indicated by the value of the variable in the LL TWT SP module in the first AP; wherein, the LL TWT SP module in the first AP includes a first information domain and / or a second information domain, the variable value in the first information domain is used to indicate whether the master-slave transmission mode is turned on, and the variable value in the second information domain is used to indicate that the first link is in the master transmission mode or the slave transmission mode.

34. The method according to any one of claims 27 to 30, characterized in that The master-slave transmission mode of the first link is indicated by the value of the variable in the LL TWT SP module in the first STA; wherein the LL TWT SP module in the first STA includes a third information field and / or a fourth information field, the variable value in the third information field is used to indicate whether the master-slave transmission mode is turned on, and the variable value in the fourth information field is used to indicate that the first link is in the master transmission mode or the slave transmission mode.

35. The method according to any one of claims 27 to 30, characterized in that The master-slave transmission mode of the second link is indicated by the value of the variable in the LL TWT SP module in the second AP; wherein, the LL TWT SP module in the second AP includes a fifth information field and / or a sixth information field, the variable value in the fifth information field is used to indicate whether the master-slave transmission mode is turned on, and the variable value in the sixth information field is used to indicate that the second link is in the master transmission mode or the slave transmission mode.

36. The method according to any one of claims 27 to 30, characterized in that The master-slave transmission mode of the second link is indicated by the value of the variable in the LL TWT SP module in the second STA; wherein the LL TWT SP module in the second STA includes a seventh information field and / or an eighth information field, the variable value in the seventh information field is used to indicate whether the master-slave transmission mode is turned on, and the variable value in the eighth information field is used to indicate that the second link is in the master transmission mode or the slave transmission mode.

37. The method according to any one of claims 27 to 30, characterized in that The method further comprises: The AP MLD determines the transmission mode of the first link based on at least one of the priority of the service transmitted within the first LL TWT SP, the priority of the service transmitted within the second LL TWT SP, the start time of the first LL TWT SP, the start time of the second LL TWT SP, the link status information of the first link, and the link status information of the second link.

38. The method of claim 37, wherein: The method further comprises: The AP MLD sends first indication information to the Non-AP MLD through a trigger frame or a management frame, where the first indication information is used to indicate a transmission mode of the first link.

39. The method according to claim 27 or 28, characterized in that The transmission mode of the first link and / or the second link is determined according to a preset condition.

40. The method of claim 39, wherein: The preset conditions include: In a case where the priority of the service transmitted in the first LL TWT SP is lower than the priority of the service transmitted in the second LL TWT SP, the first link is in a slave transmission mode and the second link is in a master transmission mode; In a case where the priority of the service transmitted in the first LL TWT SP is higher than the priority of the service transmitted in the second LL TWT SP, the first link is in a master transmission mode and the second link is in a slave transmission mode; When the priority of the service transmitted in the first LL TWT SP is the same as the priority of the service transmitted in the second LL TWT SP, and the start time of the first LL TWT SP is later than the start time of the second LL TWT SP, the first link is in a slave transmission mode and the second link is in a master transmission mode; When the priority of the service transmitted within the first LL TWT SP is the same as the priority of the service transmitted within the second LL TWT SP, and the start time of the first LL TWT SP is earlier than the start time of the second LL TWT SP, the first link is in the master transmission mode and the second link is in the slave transmission mode.

41. The method of claim 39, wherein: The preset condition is agreed upon by a protocol, or the preset condition is agreed upon by the first AP and the second AP.

42. The method according to claim 27 or 28, characterized in that The transmission mode of the first link and / or the second link is determined according to the priority of the services transmitted within the first LL TWT SP and the second LL TWT SP.

43. The method of claim 42, wherein: In the case where the priority of the service transmitted in the first LL TWT SP is lower than the priority of the service transmitted in the second LL TWT SP, the first link is in a slave transmission mode and the second link is in a master transmission mode; or, In a case where the priority of the service transmitted within the first LL TWT SP is higher than the priority of the service transmitted within the second LL TWT SP, the first link is in the master transmission mode and the second link is in the slave transmission mode.

44. The method according to claim 27 or 28, characterized in that When the priority of the service transmitted within the first LL TWT SP is the same as the priority of the service transmitted within the second LL TWT SP, the transmission mode of the first link and / or the second link is determined according to the start time of the first LL TWT SP and the second LL TWT SP.

45. The method of claim 44, wherein: When the priority of the service transmitted in the first LL TWT SP is the same as the priority of the service transmitted in the second LL TWT SP, and the start time of the first LL TWT SP is later than the start time of the second LL TWT SP, the first link is in a slave transmission mode and the second link is in a master transmission mode; or, When the priority of the service transmitted within the first LL TWT SP is the same as the priority of the service transmitted within the second LL TWT SP, and the start time of the first LL TWT SP is earlier than the start time of the second LL TWT SP, the first link is in the master transmission mode and the second link is in the slave transmission mode.

46. ​​The method of claim 27 or 28, wherein: In the case where both the first LL TWT SP and the second LL TWT SP are trigger-enabled LL TWT SPs, the master-slave transmission mode of the first link is controlled by the first AP, and / or the master-slave transmission mode of the second link is controlled by the second AP.

47. The method according to any one of claims 27 to 30, characterized in that In the case where the first link is in a slave transmission mode and the second link is in a master transmission mode, and the first STA cannot upload the uplink buffer in time, the service period of the first LL TWT SP is configured to be extended to at least cover the area where the uplink buffer of the first STA is limited; or, When the first link is in slave transmission mode and the second link is in master transmission mode, and the first STA cannot upload the downlink buffer in time, the service period of the first LL TWT SP is configured to be extended to at least cover the area where the downlink buffer of the first STA is limited.

48. The method of claim 26, wherein: The AP MLD performs data transmission on the first link and the second link, including: When the first LL TWT SP and the second LL TWT SP have the same start time and end time, and the same LL TWT parameters, the AP MLD does not set the master-slave transmission mode on the first link and the second link, and the AP MLD transmits synchronously on the first LL TWT SP and the second LL TWT SP.

49. A wireless communication device, characterized in that: The wireless communication device is applied to a non-access point multi-link device Non-AP MLD, the Non-AP MLD at least includes a first station STA and a second STA, and the first STA forms a first link with a first access point AP in an access point multi-link device AP MLD associated with it, and the second STA forms a second link with a second AP in the AP MLD; The wireless communication device comprises: a communication unit, configured to perform data transmission on the first link and the second link when a first low latency target wake-up time service period LL TWTSP is established on the first link; A second LL TWT SP is established on the second link; The first LL TWT SP and the second LL TWT SP completely overlap in the time domain.

50. A wireless communication device, characterized in that: The wireless communication device is applied to an access point multi-link device APMLD, the AP MLD includes at least a first access point AP and a second AP, and the first AP forms a first link with a first station STA in a station multi-link device Non-AP MLD associated with the first AP, and the second AP forms a second link with a second STA in the Non-AP MLD; The wireless communication device comprises: a communication unit, configured to perform data transmission on the first link and the second link when a first low latency target wake-up time service period LL TWTSP is established on the first link; A second LL TWT SP is established on the second link; The first LL TWT SP and the second LL TWT SP completely overlap in the time domain.

51. A site device, characterized in that: include: A processor and a memory, the memory being used to store a computer program, the processor being used to call and run the computer program stored in the memory to execute the method as claimed in any one of claims 1 to 24.

52. An access point device, characterized in that: include: A processor and a memory, the memory being used to store a computer program, the processor being used to call and run the computer program stored in the memory to execute the method as claimed in any one of claims 25 to 48.

53. A chip, characterized in that: include: A processor, configured to call and run a computer program from a memory, so that a device equipped with the chip executes a method as claimed in any one of claims 1 to 24.

54. A chip, characterized in that: include: A processor, configured to call and run a computer program from a memory, so that a device equipped with the chip executes a method as claimed in any one of claims 25 to 48.

55. A computer-readable storage medium, characterized in that: Used to store a computer program, the computer program causing a computer to execute the method according to any one of claims 1 to 24.

56. A computer-readable storage medium, characterized in that Used to store a computer program, the computer program causing a computer to execute the method according to any one of claims 25 to 48.

57. A computer program product, characterized in that The method comprises computer program instructions which cause a computer to execute the method as claimed in any one of claims 1 to 24.

58. A computer program product, characterized in that Comprising computer program instructions causing a computer to perform the method as claimed in any one of claims 25 to 48.

59. A computer program, characterized in that The computer program causes a computer to execute the method according to any one of claims 1 to 24.

60. A computer program, characterized in that The computer program causes a computer to execute the method according to any one of claims 25 to 48.

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