Wireless communication method and device

Abstract

The implementations described in this application provide a method and device for wireless communication. When there is an overlap area between LL TWT service providers (SPs) on multiple links of a non-AP-enabled multilink network (MLD NSTR), a master-slave transmission mode is configured on these links to avoid the problem of a low-latency service on a given link being unable to transmit on the LL TWT SP because the non-AP-enabled MLD NSTR cannot simultaneously receive and transmit. This ensures that the transmission latency requirements for low-latency services on the multiple links of the non-AP-enabled MLD NSTR are met and optimizes multilink transmission of the non-AP-enabled MLD NSTR.

Description

Wireless communication method and device TECHNICAL FIELD The achievements of this disclosure relate to communication technology and, more particularly, to a wireless communication method, a station device, an access point device, and a computer-readable storage medium. BACKGROUND The non-simultaneous transmit and receive (NSTR) multi-link device (MLD) transmission mechanism is introduced in Wireless Fidelity (WiFi) communication. In a scenario where multiple links of an NSTR MLD carry low-latency services, how to guarantee the delay requirements for transmitting these services across the multiple links is a technical problem that must be solved. The IEEE draft - "Low Latency Support" (LIWEN CHU (NXP)) discloses content for low latency TWT support, transmission of STA frames in PPDU TB in low latency SP TWT, TWT enhancement for low latency service, TXOP termination for low latency SP TWT with non-MLD NSTR AP, additional consideration for non-MLD EMLSR AP, additional consideration for non-MLD EMLMR AP, additional consideration for non-MLD MLSR AP, TID assignment to link, and new TID assignment rules to link. The IEEE draft "Low-Latency Triggered TWT" (Patrice Nezou (Canon)) analyzes a solution to support low-latency traffic based on the TWT feature. The article defines SP LL protection mechanisms and defines a low-latency TWT service period (SP TWT LL) based on broadcast TWT dedicated to LL traffic. SUMMARY The invention is described in the accompanying set of claims. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic diagram showing the architecture of a communication system in which an embodiment of the present invention can be applied. FIG. 2 is a schematic diagram showing the delay-sensitive service traffic according to this disclosure. FIG. 3 is a schematic diagram showing the resources periodically reserved according to this disclosure. Figure 4 is a schematic diagram showing a restricted TWT mechanism according to this disclosure. Figure 5 is a schematic diagram showing a combination of a TWT element and a mute element according to this disclosure. FIG. 6 is a schematic diagram showing an asynchronous transmission and a synchronous transmission according to this disclosure. FIG. 7 is a schematic diagram showing the PPDU completion time alignment according to this disclosure. FIG. 8 is a schematic diagram showing OOB interference in superimposed SP TWT LL according to the present disclosure. FIG. 9 is a schematic diagram showing the SP TWT LL overlap as realized in this disclosure. FIG. 10 is a schematic flowchart illustrating a wireless communication method according to an embodiment of the present disclosure. FIG. 11 is a schematic diagram showing a system architecture in which an implementation of the present disclosure can be applied. FIG. 12 is a schematic diagram showing the establishment of a TWT agreement according to an embodiment of this disclosure. FIG. 13 to FIG. 23 shows schematic diagrams of the SP TWT LL according to the realizations of the present disclosure. FIG. 24 is a schematic block diagram of a wireless communication device according to an embodiment of the present disclosure. FIG. 25 is a schematic block diagram of a wireless communication device according to an embodiment of the present disclosure. FIG. 26 is a schematic block diagram of a communication device according to an embodiment of the present disclosure. FIG.27 is a schematic block diagram of an apparatus according to an embodiment of the present disclosure. FIG. 28 is a schematic block diagram of a communication system according to an embodiment of the present disclosure. DESCRIPTION OF THE ACHIEVEMENTS The technical solutions in the embodiments of this disclosure are described below with reference to the figure in the embodiments of this disclosure. Obviously, the embodiments described are only some, and not all, of the embodiments of this disclosure. All other embodiments obtained by those skilled in the art based on the embodiments of this disclosure without inventive effort are deemed to be within the scope of this disclosure. The solutions according to the realizations in this disclosure can be applied to various communication systems, including, for example: Wireless Local Area Networks (WLAN), Wireless Fidelity (Wi-Fi) or other communication systems. As an example, a communication system 100 in which an implementation of the present disclosure is applied is shown in FIG.1. The communication system 100 may include an access point (AP) device 110 and a station (STA) device 120 that access a network through the AP 110. In the embodiments of this disclosure, the STA device can be deployed on land, including indoors or outdoors, handheld, carried or mounted on a vehicle, deployed on water (e.g., on a ship) or deployed in the air (e.g., on an airplane, a balloon, a satellite, etc.). In the realizations of this disclosure, the STA device may be a mobile phone, a tablet (Pad), a computer with a wireless transceiver function, a virtual reality (VR) device, an augmented reality (AR) device, a wireless device in industrial control, a wireless device in autonomous driving, a wireless device in remote medicine, a wireless device in smart grid, a wireless device in transportation security, a wireless device in smart city, or a wireless device in smart home. As non-limiting examples, in one embodiment of this disclosure, the STA device may also be a wearable device. A wearable device, also known as a smart wearable device, is a general term for wearable devices that are intelligently designed and developed from everyday clothing, such as glasses, gloves, watches, clothing, and shoes, through the application of wearable technologies. A wearable device is a device that can be worn directly or integrated into the user's clothing or accessories. A wearable device is not only a type of hardware device but can also provide powerful functions based on software support, data interaction, and cloud interaction.In a broad sense, wearable smart devices can include large, full-featured devices that can provide complete or partial functions without relying on smartphones, such as smartwatches or smart glasses, and devices that focus solely on a particular type of application function and need to cooperate with other devices, such as smartphones, for use, such as various smart bracelets and jewelry for monitoring physical signals. Figure 1 shows, as an example, one AP and two STAs. Optionally, the 100 communication system can include multiple APs and other numbers of STAs. The scope of this disclosure is not limited to this. It can be seen that, in the embodiments of this disclosure, a device that has a communication function in a network / system may be referred to as a communication device. Taking communication system 100 shown in FIG. 1 as an example, communication devices may include AP 110 and STA 120 with communication functions. AP 110 and STA 120 could be the specific devices described above, and details about them will be omitted here. Communication devices may also include other devices in communication system 100, for example, other network entities such as a network controller, a gateway, etc., and the embodiment of this disclosure is not limited to any one of these examples. Furthermore, the terms "system" and "network" may often be used interchangeably herein.The term "and / or" used herein represents only one relationship between related objects, including three relationships. For example, "A and / or B" can mean only A, only B, or both. In addition, the symbol " / " used herein represents an "or" relationship between the related objects that precede and follow the symbol. It can be seen that the term "indication," as used in the realizations of this disclosure, can be a direct indication, an indirect indication, or an association. For example, if A indicates B, it may mean that A directly indicates B, i.e., B can be derived from A. Alternatively, it may mean that A indicates B indirectly, i.e., A indicates C and B can be derived from C. Alternatively, it may mean that there is a relationship between A and B. The terms used in the embodiments of this disclosure are provided solely to explain the specific embodiments hereof, rather than to limit the disclosure hereof. Terms such as "first," "second," "third," "fourth," etc., as used in the description, claims, and figures hereof, are used to distinguish different objects from one another, rather than to define a specific order. In addition, terms such as "include" and "have" and any variants thereof are intended to encompass non-exclusive inclusion. In describing the realizations in this disclosure, the term "corresponding" may mean that there is a direct or indirect correspondence between the two, or it may mean that there is an association between the two, or that they are in a relationship of indicating and indicated, configuring and configured, or the like. In the embodiments of this disclosure, "predefined" may be implemented as pre-stored codes, tables, or other corresponding media in one or more devices (for example, including an AP and a STA) that can be used to indicate related information, and this disclosure is not limited to its specific implementation. For example, "predefined" may refer to what is defined in the protocols. In the realizations of this disclosure, "protocols" may refer to standard protocols in the field of communication, including, for example, the WiFi protocol and related protocols implemented in future WiFi communication systems. This disclosure is not limited to any one of these examples. To facilitate understanding of the technical solutions in the implementations of this disclosure, the technical solutions related to this disclosure are described below. The following related technologies, as optional solutions, may be combined arbitrarily with the technical solutions in the implementations of this disclosure, and all such combinations must fall within the scope of protection of the implementations of this disclosure. The implementations of this disclosure include at least some of the following content. With the emergence of numerous latency-sensitive applications, such as VR / AR, cloud gaming, and real-time video, extremely low latency performance has become a critical requirement for data transmission (latency-sensitive traffic is typically bursty and periodic, as shown in Figure 2). The Project Authorization Request (PAR) for the 802.11be standard notes that, in addition to supporting a maximum throughput of 30 Gbps, the standard needs to improve latency and jitter performance in WiFi transmission. At the same time, the justification for project authorization, contained in the research and development standard content document Criteria for Standards Development (CSD), points out that reduced latency and jitter is a key feature that distinguishes the standard from other standards.Existing technical solutions cannot provide a good user experience for latency-sensitive applications. Therefore, solutions are being sought that can improve latency performance to meet the requirements of these applications. The 802.11be working group has discussed several technical solutions regarding the low-latency aspect, including the Enhanced Distributed Channel Access (EDCA) mechanism, resource preemption, multichannel operation, Transmission Opportunity Exchange (TXOP), TXOP rule modification, Orthogonal Frequency Division Multiple Access (OFDMA) enhancement, resource reservation, Target Wake Time (TWT) enhancement, Multilink Operation (MLO), and more. 1) The idea behind the enhanced EDCA mechanism is to add a new EDCA queue for delay-sensitive traffic and assign it higher priority EDCA containment parameters, thereby reducing the access latency of delay-sensitive traffic. 2) The idea behind the MLO is to replace an older device with a multi-link device (MLD). The MLD can operate on multiple links simultaneously and compete for a channel on those links at the same time, in order to reduce channel access delay. 3) The idea behind the improved TWT mechanism is to repurpose it to allocate a periodic, protected, low-latency target wake-up time (SP TWT LL) service period for delay-sensitive traffic. Within the SP TWT LL, the link carrying the delay-sensitive traffic either exclusively uses the channel or competes for the channel with high priority, thereby reducing its access delay. This disclosure combines the above enhanced TWT mechanism with the MLO scheme, further extending the scheme that incorporates the TWT element and the mute element to multiple links, to solve its transmission interference problem in MLD NSTR, thereby improving the delay performance of delay-sensitive traffic to some extent. To facilitate a better understanding of the accomplishments of this disclosure, a resource reservation scheme will be described. The main idea of ​​the resource reservation scheme is to allocate periodic reserved resources for delay-sensitive periodic traffic, as shown in FIG. 3. Within the reserved resources, a station with negotiated low-latency uplink traffic can access the channel, and other stations cannot perform uplink transmissions or access the channel (or can participate in low-priority channel contention) within the reserved resources. The resource reservation scheme has the following advantages. By reserving resources for a specific type of traffic, a less congested channel can be provided for delay-sensitive traffic, thereby reducing channel contention pressure. Furthermore, other traffic with lower priority can be allowed to compete for the channel, thus improving resource utilization. In order to facilitate a better understanding of the realizations in this disclosure, a scheme for providing protected resources for periodic low-latency traffic (LL traffic) by using an enhanced TWT mechanism will be described. Delay-sensitive traffic is typically bursty and periodic, and the TWT mechanism in the 802.11ax standard can establish a periodic Target Activation Time Service Period (SP TWT) agreement between a STA and an AP. Therefore, the TWT mechanism can be reused to allocate periodic SP TWTs to an STA with periodic uplink delay-sensitive traffic, as an implementation of the resource reservation mentioned earlier. However, the TWT mechanism has some drawbacks. Specifically, if the preceding transmission has not yet completed before the SP TWT negotiated by the STA and AP begins, the transmission will not stop, leading to uncertainty about the SP TWT's start time. A restricted TWT mechanism requires that transmissions from other STAs stop before a restricted SP TWT begins, to ensure the normal start of the restricted SP TWT and to guarantee that LL traffic transmission can be completed within the limited delay. As shown in Figure 4, before the start of a restricted SP TWT, the transmission opportunities (TXOPs) of other regular STAs (i.e., STAs that do not support low-latency services) must be terminated, and the TXOP of the STA must end before it expires, so that the STA that supports low-latency services (low-latency STA) can exchange frames within a specified SP. In this case, a request-to-send (RTS) or command-to-send (CTS) protocol, equivalent to a handshake protocol, is used to resolve the problem of frame exchange collisions caused by hidden terminals. The RTS is enabled after a distributed inter-frame spacing (DIFS) protocol is implemented.When RTS / CTS is enabled, a station transmits an RTS frame before transmitting a data frame. When the receiver is ready to receive a data frame, it responds with a CTS frame. Following the RTS / CTS exchange, a window of time (identified in the CTS frame) begins, allowing the station (STA) to send a data frame to the receiver once the transmitter has acknowledged its reception. After receiving the data frame, the receiver transmits an acknowledgment (ACK) or block acknowledgment (BA) to the transmitter to confirm receipt of the data frame after a short interframe gap (SIFS). Specifically, by combining the TWT element and the silence element, transmissions from other STAs can end before the restricted SP TWT begins. In particular, the period, start time, end time, and other parameters of an SP TWT negotiated by the STA and the AP are set with the same values ​​as the related parameters of the silence element, as shown in Figure 5. Since the silence element exists in the previous standard, both traditional stations and extremely high-throughput (EHT) stations can set their own silence time according to the silence element. EHT stations participating in the restricted SP TWT can ignore the silence element, become active normally during the restricted SP TWT period, and then exchange data with the AP. To facilitate a better understanding of the realizations in this disclosure, the multi-link data transmission scheme will be described. In MLOs, there are two transmission schemes: asynchronous transmission and synchronous transmission. Asynchronous transmission means that, among the multiple links on which the MLD operates, each link functions independently and does not need to be aligned. Synchronous transmission means that each link must be aligned and synchronized, as shown in Figure 6. However, if a non-AP MLD is an NSTR device, it cannot operate in asynchronous mode because there will be an out-of-band leakage (OOB) or device coexistence interference (IDC) problem on the NSTR link pair. Therefore, if a given MLD needs to transmit data across a pair of NSTR links simultaneously, it must operate synchronously to avoid the OOB problem. In multi-link data transmission schemes, to avoid out-of-bounds (OOB) or interfering with out-of-bounds (IDB) interference, there is a PPDU alignment solution, which can be divided into two schemes: physical layer protocol data unit (PPDU) start-time alignment and PPDU end-time alignment. PPDU start-time alignment requires some modifications to the existing access mechanism. The PPDU completion time alignment scheme, as shown in Figure 6, requires that the absolute value of the difference between the completion times of PPDUs transmitted on multiple links be less than a certain limit (e.g., Short Interframe Spacing (SIFS)) to prevent out-of-bounds (OOB) issues. Without this restriction, after a requested PPDU transmitted on link 1 (link1) completes, a response PPDU will be received after the SIFS time. At this point, if data is still being transmitted on link2, the reception of the response PPDU will be affected. In a non-AP NSTR MLD, if there is an SP1 TWT LL on link1, then adjustments to transmissions on other links (such as link2) must be considered during the SP1 TWT LL. For an MLD AP, when AP1 affiliated with the MLD AP on link1 and STA1 affiliated with the non-AP NSTR MLD on link1 negotiate an SP1 TWT LL, the MLD AP has two options: 1. the MLD AP timeout of PPDUs transmitted to the non-AP MLD on link1 and link2; and 2. the MLD AP cannot transmit frames to the non-AP MLD on link2 within the SP1 TWT LL. For the non-AP MLD, an affiliated STA2 on link2 stops its TXOP before the SP1 TWT LL begins. Rules such as resource preemption, multichannel operation, TXOP sharing, TXOP rule modification, and OFDMA enhancement have not been specified in the current standard and cannot be directly applied. The enhanced EDCA mechanism is only one part of the overall Quality of Service (QoS) framework. It is essential for meeting the requirements of latency-sensitive applications and improving the user experience. It cannot meet these requirements on its own and specifically needs to work in conjunction with other technical solutions. For example, it can be combined with MLO to create latency-sensitive links. The MLO operation remains at the concept level in terms of latency reduction. For example, if a device can support eight active links, and each link can handle a 1-millisecond delay with a 90% probability, then this MLD could theoretically handle a 1-millisecond latency with a 99.999999% probability. However, the current standard doesn't address the specific implementation or operation of MLO in terms of low latency. Furthermore, MLO still presents issues such as out-of-band interference within STA NSTR devices that need to be resolved, and significant detailed work will be required before it can provide practical services for latency-sensitive traffic. The enhanced TWT mechanism is the most recent development in 802.11be regarding low latency.It combines the TWT element and the mute element to provide a protected access period for time-sensitive, periodic traffic. On the one hand, the mute element can prevent SP TWT LL member stations from competing for channels during an SP TWT LL. On the other hand, SP TWT LL member stations can ignore the mute element, thus becoming active and transmitting data at the SP TWT LL start time. However, the current discussion is limited to a single link and does not address the application of the mute element to multiple links. Furthermore, potential problems exist, such as MLD NSTR devices on multiple links, so it cannot be directly applied to multiple links to provide the best possible service for time-sensitive applications, for example, the OOB interference problem within the SP TWT LL shown in Figure 8.If this scheme is applied directly to an MLD NSTR device with two links, the SP TWTs on the two links may overlap. In this case, since the MLD NSTR device cannot receive and transmit simultaneously, the transmission of a low-latency service on a given link may not be completed on the SP TWT LL. It should be noted that the station device (STA) may also be called a non-access point station (non-AP STA). In light of the aforementioned problems, this disclosure provides a multi-link SP TWT LL cooperation scheme based on an MLD NSTR device. In a scenario where multiple links of an MLD NSTR device carry separate low-latency services, the delay requirements for low-latency service transmissions can be guaranteed across the multiple links. The TWT LL used in this disclosure refers to the TWT established by the restricted TWT mechanism. This disclosure uses a non-AP MLD and an AP MLD as data transmission examples. In this disclosure, the non-AP MLD is a non-AP NSTR MLD, and the AP MLD is a simultaneous transmit / receive (STR) AP MLD. The application scenario of this disclosure may be as follows. When the AP MLD is a non-AP NSTR MLD establishing an SP TWT LL on a pair of NSTR links, there are two cases: 1) For a time interval, only the SP TWT LL on one link includes the interval (i.e., the SP TWT LLs on the pair of NSTR links do not overlap); 2) the SP TWT LLs on both links include the interval (i.e., the SP TWT LLs on the pair of NSTR links overlap), as shown in FIG.9. It should be noted that this disclosure covers several cases related to the SP TWT LL overlap problem across multiple links. Furthermore, the solution of extending a silence element across multiple links is also within the scope of protection of this disclosure. The technical solutions in this disclosure will be described in detail below with reference to specific implementations. Figure 10 is a schematic flowchart illustrating a wireless communication method 200 according to a claimed embodiment of this disclosure. The wireless communication method 200 is implemented in a multi-link communication system consisting of a non-AP MLD and an AP MLD. The non-AP MLD includes at least a first STA and a second STA. 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, as shown in Figure 10, the wireless communication method 200 may include at least some of the following content. In S210, when a first SP TWT LL is established on the first link, the non-AP MLD performs data transmission on the first link and the second link. In an embodiment of the present disclosure, the first STA may establish the first SP TWT LL on the first link according to the first information. In one embodiment of this disclosure, the first link and the second link can be a pair of NSTR links. Specifically, as shown in Figure 11, the AP MLD includes the first AP and the second AP, the non-AP MLD includes the first STA and the second STA, the first STA and the first AP form the first link, and the second STA and the second AP form the second link. Affiliated devices on the same MLD can exchange messages. For example, the first AP and the second AP can exchange messages, and the first STA and the second STA can exchange messages. It should be noted that a non-AP MLD is generally an NSTR MLD, and an AP MLD is generally an STR MLD. It should also be noted that an NSTR MLD may include links other than the first and second bonds, and this disclosure is not limited to this. It should be noted that the purpose of establishing the SP TWT LL is to provide a protection period for delay-sensitive traffic from non-AP MLDs with multiple delay-sensitive service flows. For example, in the first SP TWT LL, only the first STA and the first AP can access the channel and transmit data. In some implementations, the first STA and the second STA can transmit restricted TWT request frames (R-TWTs) to the first AP and the second AP, respectively, requesting to establish their respective R-TWT agreements. After receiving an R-TWT request frame and determining the R-TWT parameters, the first AP and / or the second AP transmit an R-TWT response frame to the first STA and / or the second STA to approve the establishment of the TWT agreement. Alternatively, the first STA can transmit a multi-link R-TWT request frame to the first AP, requesting to establish R-TWT agreements on the first and second links, respectively. After receiving a multi-link R-TWT request frame and determining the R-TWT parameters on both links, the first AP transmits a multi-link R-TWT response frame to the first STA to approve the establishment of the R-TWT agreements on the first and second links.So far, the establishment of the SP TWTs on both links has been completed. After receiving the R-TWT response frame from the MLD AP, the STA affiliated with the non-AP MLD (the first STA and / or the second STA) receives a beacon frame at the target beacon transmission time (TBTT). The beacon frame contains both an R-TWT element and a silence element. The R-TWT element indicates information related to SP TWT LL. The silence intervals indicated by the silence element completely overlap with the SP TWT indicated by the TWT element. The specific process is shown in Figure 12. In a claimed embodiment, the first SP TWT LL can be established on the first link and a second SP TWT LL can be established on the second link. In one claimed embodiment, the first SP TWT LL and the second SP TWT LL completely overlap in the time domain. In some unclaimed embodiments, the first SP TWT LL and the second SP TWT LL may partially overlap in the time domain, or the first SP TWT LL and the second SP TWT LL may not overlap in the time domain. It should be noted that the first SP TWT LL and the second SP TWT LL that completely overlap in the time domain may include having the same start time and end time and having the same TWT LL parameter. In some embodiments, when the first SP TWT LL and the second SP TWT LL overlap totally or partially 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 a leader / follower transmission mode on the first link and the second link. Specifically, for example, when the first link and second link of the non-AP MLD belong to an NSTR link pair, the non-AP MLD can perform data transmission on the first link and second link according to a leader / follower transmission mode on the first link and second link. In some implementations, the leader / follower transmission mode can be configured to be enabled within the first SP TWT LL and the second SP TWT LL, and disabled outside of the first SP TWT LL and the second SP TWT LL. In other words, for the first and second links, the leader / follower transmission mode is enabled for transmissions on both links within the SP TWT LL region, and disabled for transmissions on both links outside the SP TWT LL region. The MLD NSTR device has the function of switching the leader / follower operating mode on the links. In some embodiments, in a region of the second SP TWT LL that overlaps the first SP TWT LL in the time domain, when the first link is in leader transmission mode, the second link is in follower transmission mode, the second AP and / or the second STA may not actively transmit data, and the second AP and / or the second STA may passively perform a synchronous transmission or stop transmitting and receiving data in accordance with the transmission on the first link (corresponding to the transmission in the region where the first SP TWT LL and the second SP TWT LL overlap in the time domain). In some embodiments, in a region of the first SP TWT LL that overlaps the second SP TWT LL in the time domain, when the first link is in follower transmission mode, the second link is in leader transmission mode, the first AP and / or the first STA may not actively transmit data, and the first AP and / or the first STA may passively perform a synchronous transmission or stop transmitting and receiving data in accordance with the transmission on the second link (corresponding to the transmission in the region where the first SP TWT LL and the second SP TWT LL overlap in the time domain). In some unclaimed embodiments, when the first AP and / or the first STA performs a data transmission in a region of the first SP TWT LL, and the second AP and / or the second STA is in a region that overlaps the first SP TWT LL in the time domain, but is not within the second SP TWT LL, the second AP and / or the second STA may not actively transmit data, and the second AP and / or the second STA may passively perform a synchronous transmission or stop the transmission and reception of data in accordance with the transmission on the first link (corresponding to the transmission in the region where the first SP TWT LL and the second SP TWT LL do not overlap in the time domain). In some unclaimed embodiments, when the second AP and / or the second STA performs a data transmission in a region of the second SP TWT LL, and the first AP and / or the first STA is in a region that overlaps the second SP TWT LL in the time domain, but is not within the first SP TWT LL, the second AP and / or the second STA may not actively transmit data, and the second AP and / or the second STA may passively perform a synchronous transmission or stop the transmission and reception of data in accordance with the transmission on the first link (corresponding to the transmission in the region where the first SP TWT LL and the second SP TWT LL do not overlap in the time domain). In other words, in the SP TWT LL region, a leader link and a follower link must be selected in the NSTR link pair (i.e., the first link and the second link). The leader link determines the transmission order of the data packets, while the follower link does not actively transmit data but performs passive synchronous transmission based on the leader link's transmission. In some implementations, the leader / follower transmission mode of the first link can be controlled by the first AP and / or the first STA, and / or the leader / follower transmission mode of the second link can be controlled by the second AP and / or the second STA. In some implementations, the leader / follower transmission mode of the first link can be controlled by the first AP by instructing the first STA through an activation frame or a management frame, and / or the leader / follower transmission mode of the second link can be controlled by the second AP by instructing the second STA through an activation frame or a management frame. For example, the first AP can transmit an activation frame to the first STA to instruct the first STA to establish the first link as the leading transmission mode, and the first STA can establish the first link as the leading transmission mode according to the instruction in the activation frame. In another example, the first AP can transmit a management frame to the first STA to instruct the first STA to configure the first link as follower transmission mode, and the first STA can configure the first link as follower transmission mode according to the instruction in the management frame. In some implementations, the first STA can receive the first indication information transmitted by the first AP via an activation frame or a management frame. This first indication information signals the transmission mode of the first link, and the first STA can configure the leader / follower transmission mode of the first link accordingly. In some implementations, when both the first and second SP TWT LL are enabled, the lead / follow transmission mode of the first link can be controlled by the first AP, and / or the lead / follow transmission mode of the second link can be controlled by the second AP. It should be noted that when both the first and second SP TWT LL are enabled, the first STA is not permitted to access the channel using an EDCA mechanism on the first SP TWT LL, and the second STA is not permitted to access the channel using an EDCA mechanism on the second SP TWT LL. In some implementations, the leader / follower transmission mode of the first link can be indicated by the value of a variable in an SP TWT LL module in the first AP. The SP TWT LL module in the first AP includes a first information field and / or a second information field. The value of a variable in the first information field indicates whether the leader / follower transmission mode should be enabled, and the value of a variable in the second information field indicates whether the first link is in leader or follower transmission mode. For example, in the SP TWT LL module of the first AP, the first information field may include a 0 / 1 variable, where 0 means that the leader / follower transmission mode is disabled and 1 means that the leader / follower transmission mode is enabled, and the second information field may include a 0 / 1 variable, where 0 represents the follower transmission mode and 1 represents the leader transmission mode. In some implementations, the leader / follower transmission mode of the first link can be indicated by the value of a variable in an SP TWT LL module in the first STA. The SP TWT LL module in the first STA includes a third information field and / or a fourth information field. The value of a variable in the third information field indicates whether the leader / follower transmission mode should be enabled, and the value of a variable in the fourth information field indicates whether the first link is in leader or follower transmission mode. For example, in the SP TWT LL module in the first STA, the third information field may include a 0 / 1 variable, where 0 means that the leader / follower transmission mode is disabled and 1 means that the leader / follower transmission mode is enabled, and the fourth information field may include a 0 / 1 variable, where 0 represents the follower transmission mode and 1 represents the leader transmission mode. In some implementations, the leader / follower transmission mode of the second link can be indicated by the value of a variable in an SP TWT LL module in the second AP. The SP TWT LL module in the second AP includes a fifth information field and / or a sixth information field. The value of a variable in the fifth information field indicates whether the leader / follower transmission mode should be enabled, and the value of a variable in the sixth information field indicates whether the second link is in leader or follower transmission mode. For example, in the SP TWT LL module of the second AP, the fifth information field may include a 0 / 1 variable, where 0 means that the leader / follower transmission mode is disabled and 1 means that the leader / follower transmission mode is enabled, and the sixth information field may include a 0 / 1 variable, where 0 represents the follower transmission mode and 1 represents the leader transmission mode. In some implementations, the leader / follower transmission mode of the second link can be indicated by the value of a variable in an SP TWT LL module in the second STA. The SP TWT LL module in the second STA includes a seventh information field and / or an eighth information field. The value of a variable in the seventh information field indicates whether the leader / follower transmission mode should be enabled, and the value of a variable in the eighth information field indicates whether the second link is in leader or follower transmission mode. For example, in the SP TWT LL module in the second STA, the seventh information field may include a 0 / 1 variable, where 0 means that the leader / follower transmission mode is disabled and 1 means that the leader / follower transmission mode is enabled, and the eighth information field may include a 0 / 1 variable, where 0 represents the follower transmission mode and 1 represents the leader transmission mode. In some implementations, the first AP can determine the transmission mode of the first link based on at least one priority of a service transmitted on the first SP TWT LL, a priority of a service transmitted on the second SP TWT LL, the start time of the first SP TWT LL, the start time of the second SP TWT LL, the link state information of the first link, and the link state information of the second link. For example, when the priority of the service transmitted on the first SP TWT LL is the lowest among the services allowed to be transmitted on SP TWT LL, the first AP may determine to establish the first link as follower transmission mode. In another example, when the priority of the service transmitted on the first SP TWT LL is the highest among the services allowed to be transmitted on SP TWT LL, the first AP can determine to establish the first link as the leading transmission mode. In another example, when the link state information of the first link reflects that the link quality of the first link is relatively low, the first AP may decide to set the first link as a follower transmission mode. In another example, when the link state information of the first link reflects that the link quality of the first link is relatively high, the first AP can determine to establish the first link as the leading transmission mode. In another example, when the priority of the service transmitted on the first SP TWT LL is lower than the priority of the service transmitted on the second SP TWT LL, the first AP may determine to establish the first link as follower transmission mode. In another example, when the priority of the service transmitted on the first SP TWT LL is higher than the priority of the service transmitted on the second SP TWT LL, the first AP can determine to establish the first link as the leading transmission mode. In another example, when the priority of the service transmitted on the first SP TWT LL is the same as the priority of the service transmitted on the second SP TWT LL, and the start time of the first SP TWT LL is later than the start time of the second SP TWT LL, the first AP can determine to establish the first link as follower transmission mode. In another example, when the priority of the service transmitted on the first SP TWT LL is the same as the priority of the service transmitted on the second SP TWT LL, and the start time of the first SP TWT LL is earlier than the start time of the second SP TWT LL, the first AP can determine to establish the first link as the leading transmission mode. In another example, when the link quality of the first link, as reflected in its link-state information, is worse than the link quality of the second link, as reflected in its link-state information, the first access point (AP) can choose to set the first link as the follower transmission mode. Conversely, when the link quality of the first link, as reflected in its link-state information, is better than the link quality of the second link, as reflected in its link-state information, the first AP can choose to set the first link as the leader transmission mode. It should be noted that link-state information can be a channel attribute of the link.It can reflect a fading factor of a signal on each transmission path, i.e., a value for each element in an H-link gain matrix, such as signal dispersion, fading (multipath fading or shadow fading), power decrease with distance, etc. In some embodiments, the transmission mode of the first link and / or the second link can be determined according to a predetermined condition. In some implementations, the default condition may include: When the priority of the service transmitted on the first SP TWT LL is less than the priority of the service transmitted on the second SP TWT LL, the first link is in follower transmission mode and the second link is in leader transmission mode; When the priority of the service transmitted on the first SP TWT LL is higher than the priority of the service transmitted on the second SP TWT LL, the first link is in leader transmission mode and the second link is in follower transmission mode; When the priority of the service transmitted on the first SP TWT LL is the same as the priority of the service transmitted on the second SP TWT LL, and the start time of the first SP TWT LL is later than the start time of the second SP TWT LL, the first link is in follower transmission mode and the second link is in leader transmission mode; or When the priority of the service transmitted on the first SP TWT LL is the same as the priority of the service transmitted on the second SP TWT LL, and the start time of the first SP TWT LL is earlier than the start time of the second SP TWT LL, the first link is in leader transmission mode and the second link is in follower transmission mode. In some implementations, the default condition may be agreed upon in a protocol, or the default condition may be agreed upon by the first AP and the second AP. In some implementations, the transmission mode of the first link and / or the second link can be determined according to the priorities of the services transmitted on the first SP TWT LL and the second SP TWT LL. For example, when the priority of the service transmitted on the first SP TWT LL is lower than the priority of the service transmitted on the second SP TWT LL, the first link can be in follower transmission mode and the second link can be in leader transmission mode. In another example, when the priority of the service transmitted on the first SP TWT LL is higher than the priority of the service transmitted on the second SP TWT LL, the first link can be in leader transmission mode and the second link can be in follower transmission mode. In some embodiments, when the priority of the service transmitted on the first SP TWT LL is the same as the priority of the service transmitted on the second SP TWT LL, the transmission mode of the first link and / or the second link can be determined according to the start time of the first SP TWT LL and the start time of the second SP TWT LL. For example, when the priority of the service transmitted on the first SP TWT LL is the same as the priority of the service transmitted on the second SP TWT LL, and the start time of the first SP TWT LL is later than the start time of the second SP TWT LL, the first link can be in follower transmission mode and the second link can be in leader transmission mode. In another example, when the priority of the service transmitted on the first SP TWT LL is the same as the priority of the service transmitted on the second SP TWT LL, and the start time of the first SP TWT LL is earlier than the start time of the second SP TWT LL, the first link can be in leader transmission mode and the second link can be in follower transmission mode. Therefore, in carrying out the present disclosure, by establishing the leader / follower transmission mode on the first link and the second link, the transmission of the low latency service on the first link and the second link that is configured as leader transmission mode can be guaranteed, to avoid the problem that when the SP TWT LL on two links overlap, the transmission of the low latency service on one link cannot be completed within the SP TWT LL since the MLD NSTR device cannot receive and transmit at the same time. In some implementations, when the first link is in follower transmission mode and the second link is in leader transmission mode, and the first STA cannot load an uplink buffer in time, the service period of the first SP TWT LL can be configured to extend at least to cover a region where the uplink buffer of the first STA is restricted. In some implementations, when the first link is in follower transmission mode and the second link is in leader transmission mode, and the first STA cannot load a downlink buffer in time, the service period of the first SP TWT LL can be configured to extend to cover at least one region where the downlink buffer of the first STA is restricted. In some embodiments, when the first link is in a follower transmission mode, the second link is in a leader transmission mode, and data transmission on the first SP TWT LL has finished before the start time of the second SP TWT LL, the non-AP MLD (as the first STA) can release the remaining service time of the first SP TWT LL. In some implementations, the first SP TWT LL is established on the first link, but no SP TWT LL is established on the second link. In this case, the non-AP MLD and / or the AP MLD can perform data transmission on both the first and second links using a leader / follower transmission mode. Specifically, for example, when the first and second links of the non-AP MLD belong to an NSTR link pair, the non-AP MLD can perform data transmission on both links at least within the time range of the first SP TWT LL, using a leader / follower transmission mode. In some implementations, the leader / follower transmission mode can be configured to be enabled within the first SP TWT LL and disabled outside the first SP TWT LL. In some embodiments, when the first link is in leader transmission mode, the second link may be in follower transmission mode, the second AP and / or the second STA may not actively transmit data on the second link within a time range of the first SP TWT LL, and the second AP and / or the second STA may perform synchronous transmission or stop transmitting and receiving data within the time range of the first SP TWT LL in accordance with the transmission on the first link. In some implementations, when the first SP TWT LL and the second SP TWT LL have the same start time, the same end time, and the same TWT LL parameter, the non-AP MLD can perform a synchronous transmission on the first SP TWT LL and the second SP TWT LL without configuring the leader / follower transmission mode on the first link and the second link. In some implementations, when the first SP TWT LL and the second SP TWT LL have the same start time, the same end time, and the same TWT LL parameter, the MLD AP can perform a synchronous transmission on the first SP TWT LL and the second SP TWT LL without configuring the leader / follower transmission mode on the first link and the second link. In some implementations, when the first SP TWT LL is established on the first link and an SP TWT LL is not established on the second link, the leader / follower transmission mode of the first link can be controlled by the first AP and / or the first STA. In some implementations, when the first SP TWT LL is established on the first link and an SP TWT LL is not established on the second link, the leader / follower transmission mode of the first link can be controlled by the first AP by instructing the first STA through an activation frame or a management frame. In some unclaimed embodiments, when the first SP TWT LL is set on the first link and no SP TWT LL is set on the second link, the leader / follower transmission mode of the first link can be indicated by the value of a variable in an SP TWT LL module in the first AP. The SP TWT LL module in the first AP includes a first information field and / or a second information field; the value of a variable in the first information field indicates whether the leader / follower transmission mode should be enabled, and the value of a variable in the second information field indicates whether the first link is in leader or follower transmission mode. In some unclaimed embodiments, when the first SP TWT LL is set on the first link and no SP TWT LL is set on the second link, the leader / follower transmission mode of the first link can be indicated by the value of a variable in an SP TWT LL module in the first STA. The SP TWT LL module in the first STA includes a third information field and / or a fourth information field; the value of a variable in the third information field indicates whether the leader / follower transmission mode should be enabled, and the value of a variable in the fourth information field indicates whether the first link is in leader or follower transmission mode. Therefore, in fulfilling the request, when the first SP TWT LL is set on the first link, and no SP TWT LL is set on the second link, by configuring the first link as leader transmission mode and the second link as follower transmission mode, low latency service transmission can be guaranteed on the first link. In some unclaimed embodiments, when the first SP TWT LL is set on the first link and the second SP TWT LL is set on the second link, the first SP TWT LL and the second SP TWT LL may not overlap in the time domain. In some unacknowledged embodiments, the first SP TWT LL and the second SP TWT LL may not overlap in the time domain as programmed by the first AP or the second AP. In some unclaimed embodiments, the first SP TWT LL and the second SP TWT LL may not overlap in the time domain as scheduled by the first AP at the request of the first STA; or the first SP TWT LL and the second SP TWT LL may not overlap in the time domain as scheduled by the second AP at the request of the second STA. In some embodiments, the first information may include a TWT element, and a control field in the TWT element may include at least one reserved bit indicating that the first SP TWT LL and the second SP TWT LL do not overlap in the time domain. Therefore, in the implementation of this disclosure, the first SP TWT LL and the second SP TWT LL do not overlap in the time domain, to avoid the problem that when SP TWT LLs on two links overlap, the transmission of the low-latency service on one link cannot be completed within the SP TWT LL since the MLD NSTR device cannot receive and transmit at the same time. In some implementations, the non-AP MLD (e.g., the first STA) may terminate a TXOP on the first link before the start time of the second SP TWT LL, or the non-AP MLD (e.g., the first STA) may abandon a TXOP on the first link that has not finished by the start time of the second SP TWT LL. Specifically, for example, when the priority of the service transmitted on the first SP TWT LL is lower than the priority of the service transmitted on the second SP TWT LL, the first STA can either terminate the TXOP on the first link before the start time of the second SP TWT LL, or the first STA can abandon the TXOP on the first link, which has not yet finished by the start time of the second SP TWT LL. That is, the first SP TWT LL and the second SP TWT LL partially overlap in the time domain. Therefore, in carrying out the present disclosure, the first STA terminates the TXOP on the first link before the start time of the second SP TWT LL, or the first STA abandons the TXOP on the first link that has not finished by the start time of the second SP TWT LL, to avoid the problem that when the SP TWT LLs on two links overlap, the transmission of the low-latency service on one link cannot be completed within the SP TWT LL since the MLD NSTR device cannot receive and transmit at the same time. In some implementations, when both the first SP TWT LL and the second SP TWT LL are SP TWT LL enabled for activation, the non-AP MLD or the AP MLD can control a last scheduled transmission for the first SP TWT LL before the start time of the second SP TWT LL so that it ends before the start time of the second SP TWT LL. Specifically, for example, when the priority of the service transmitted on the first SP TWT LL is lower than the priority of the service transmitted on the second SP TWT LL, and when both the first and second SP TWT LL are wake-up-enabled SP TWT LLs, the last scheduled transmission for the first SP TWT LL before the start time of the second SP TWT LL ends before the start time of the second SP TWT LL. That is, the first SP TWT LL and the second SP TWT LL partially overlap in the time domain. Therefore, in carrying out the present disclosure, when both the first SP TWT LL and the second SP TWT LL are SP TWT LL enabled for activation, the last scheduled transmission for the first SP TWT LL before the start time of the second SP TWT LL ends before the start time of the second SP TWT LL, to avoid the overlap of SP TWT LL on the two links, to avoid the problem that when the SP TWT LLs on two links overlap, the transmission of the low latency service on one link cannot be completed within the SP TWT LL since the MLD NSTR device cannot receive and transmit at the same time. In some implementations, when data transmission in the first SP TWT LL has finished before the start time of the second SP TWT LL, the non-AP MLD (e.g., the first STA) can release the remaining time of the first SP TWT LL. Specifically, for example, when the priority of the service transmitted in the first SP TWT LL is lower than the priority of the service transmitted in the second SP TWT LL, and when the data transmission in the first SP TWT LL has finished before the start time of the second SP TWT LL, the priority of the service transmitted in the first SP TWT LL is lower than the priority of the service transmitted in the second SP TWT LL. That is, the first SP TWT LL and the second SP TWT LL partially overlap in the time domain. Therefore, in carrying out the present disclosure, when the data transmission in the first SP TWT LL has finished before the start time of the second SP TWT LL, the first STA releases the remaining time of the first SP TWT LL, to avoid the problem that when the SP TWT LLs on two links overlap, the transmission of the low latency service on one link cannot be completed within the SP TWT LL since the MLD NSTR device cannot receive and transmit at the same time. This disclosure extends the enhanced TWT mechanism for low-latency services to multiple links and further improves upon the delay performance improvement offered by single-link technology. Considering the portability and cost of the multi-link STA device, it is also important to consider factors such as the energy savings of the multi-link STA device, which aligns with the design of the present invention. The primary objective of this disclosure is to extend the enhanced TWT mechanism to multiple links in order to provide predictable delay services for delay-sensitive traffic. The TWT mechanism can meet the original requirements of non-AP MLDs. Therefore, the technical solutions in this disclosure can reduce latency and are also aligned with the standardization process. The solutions in this disclosure will be described in detail below with reference to Implementation 1 through Implementation 10. In embodiment 1, no SP TWT LL is established on link 1, and SP2 TWT LL is established on link 2. As shown in FIG. 13, there is no delay-sensitive service on link 1, and a delay-sensitive service flow is transmitted on SP2 TWT LL on link 2. Normal data transmission occurs on link 1 before SP2 TWT LL begins. When the SP2 TWT LL period begins, the SP TWT LL management modules on the corresponding affiliated devices on link 1 and link 2 set the values ​​of the corresponding variables, respectively. In the SP TWT LL management module of the affiliated AP (i.e., AP2) and the corresponding affiliated STA (i.e., STA2) for link 2, a link 0 / 1 transmission mode variable is set to 1, and a link leader / follower indicator variable is set to 1.In the SP TWT LL management module of the affiliated AP (i.e., AP1) and the corresponding affiliated STA (i.e., STA1) on link 1, a link 0 / 1 transmission mode variable is set to 1, and a link leader / follower indicator variable is set to 0. AP1 and STA1 can use rule b as their channel access rule. When the backoff counter is 0, they remain silent and do not transmit. Once data transmission begins on link 2, transmissions on link 1 and link 2 are kept synchronized. AP1 and STA1 can use rule b as their channel access rule. Specifically, AP1 and STA1 can choose not to transmit data or signals even if they have a channel transmission opportunity, or AP1 and STA1 can choose not to transmit data or signals even if they have access to the channel. It should be noted that link 2 in Realization 1 may correspond to the first link mentioned above; that is, AP2 may correspond to the first AP above. STA2 may correspond to the first STA above. Link 1 may correspond to the second link above; that is, AP1 may correspond to the second AP above, and STA1 may correspond to the second STA above. In Implementation 2, SP1 TWT LL is established on link 1 and SP2 TWT LL is established on link 2. As shown in Figure 14, there is a partial overlap region between SP1 TWT LL and SP2 TWT LL, and transmission on link 1 normally begins at the start of SP1 TWT LL. When SP2 TWT LL begins, link 2 is the leading link and link 1 is the following link. No active transmission occurs on link 1, and when downlink transmission occurs on link 2, downlink transmissions occur synchronously on both links 1 and 2. In Realization 3, SP1 TWT LL is established on link 1 and SP2 TWT LL is established on link 2. As shown in Figure 15, SP1 TWT LL and SP2 TWT LL partially overlap. Once SP2 TWT LL starts, link 2 becomes the leader link and link 1 becomes the follower link. Since link 1 has no downlink data after SP2 TWT LL starts, link 1 is idle during downlink transmission on link 2. In an optional implementation of Realization 3, since delay-sensitive data is also transmitted in SP1 TWT LL, in this case, after SP2 TWT LL starts, because link 2 is the leading link and link 1 is the following link, STA1 cannot transmit its uplink buffer in time, which will degrade system performance to some extent. To reduce this degradation, SP1 TWT LL can be extended within the restricted delay time range of STA1's uplink buffer to transmit STA1's uplink buffer, as shown in Figure 16. It should be noted that the uplink buffer in Implementation 3 above can alternatively be a downlink buffer. For further details, see the corresponding description of the uplink buffer; its description will be omitted here. In Realization 4, SP1 TWT LL is established on link 1 and SP2 TWT LL is established on link 2. As shown in Figure 17, SP1 TWT LL completely overlaps SP2 TWT LL. STA1 has a TXOP and determines if the TXOP duration exceeds the start time of SP2 TWT LL on link 2. If so, STA1 shortens the PPDU transmission time by adjusting the PPDU length or the transmit modulation and coding scheme (MCS), etc., to ensure that the TXOP ends before SP2 TWT LL begins. When STA1 has a TXOP, if the start time of SP2 TWT LL on link 2 is close to the current time, STA1 can abandon the TXOP without transmitting. When AP1 has a downlink TXOP operation for transmission to STA1, it also needs to perform the same operation as STA1 described above. In Realization 5, SP1 TWT LL is established on link 1 and SP2 TWT LL is established on link 2. As shown in Figure 18, there is a partial overlap between SP1 TWT LL and SP2 TWT LL, and the priority of the service transmitted on SP1 TWT LL is lower than that of the service transmitted on SP2 TWT LL. However, before SP2 TWT LL begins, the data transmission on SP1 TWT LL has completed, and at that point, STA1 actively releases its remaining SP time. In this case, for SP2 TWT LL, the management module SP TWT LL corresponding to link 2 establishes link 2 as the leading transmission link, and no update is performed for the management module SP TWT LL corresponding to link 1 since STA1 is in a standby state. Transmission on link 2 is unaffected. It should be noted that all the above implementations use the NSTR link pair as an example. In practice, a non-AP NSTR MLD can have each of the two links1, link2, and link3 as an NSTR link pair simultaneously. The coordinated synchronous transmission solution designed in this disclosure is also applicable to this situation. For example, assuming that the service priorities on the SP TWTs on link1, link2, and link3 are in descending order, with this solution, synchronous transmission is performed on link2 according to link1, and synchronous transmission is performed on link3 according to link2. In Realization 6, SP1 TWT LL is established on link 1 and SP2 TWT LL is established on link 2. As shown in Figure 19, there is no overlap between SP1 TWT LL and SP2 TWT LL. During the SP TWT LL establishment phase, an affiliated STA (STA1 or STA2) on one link in the non-AP MLD can request the AP MLD whether to allocate an SP TWT LL that overlaps with the SP TWT LL on the other link in the NSTR link pair. Specifically, this can be indicated using the TWT element, for example, the reserved bits B6 and B7 in the TWT element control field, where "01" indicates no overlap, "10" indicates full overlap, and "11" indicates partial overlap. As shown in FIG.19, STA1 on the non-AP MLD can request SP 1 TWT LL that does not overlap with SP 2 TWT LL on link 2 by exchanging frames with AP1. In Implementation 7, SP1 TWT LL is established on link 1 and SP2 TWT LL is established on link 2. As shown in Figure 20, there is a partial overlap region between SP1 TWT LL and SP2 TWT LL, and the priority of the service transmitted on SP1 TWT LL is lower than that of the service transmitted on SP2 TWT LL. The SP1 TWT LLs established on the two links are both activation-enabled SP1 TWTs. Uplink and downlink transmissions on SP1 TWT LL and SP2 TWT LL are managed by the AP, and STA1 and STA2 are not permitted to access the channel using the EDCA mechanism. Therefore, when initiating the last scheduled transmission before the start of SP2 TWT LL, AP1 must ensure that the scheduled transmission finishes before the start of SP2 TWT LL, as shown in the dotted box in Figure 20. In Realization 8, SP1 TWT LL is established on link 1 and SP2 TWT LL is established on link 2. As shown in Figure 21, there is a partial overlap region between SP1 TWT LL and SP2 TWT LL, and the priority of the service transmitted on SP1 TWT LL is the same as that of the service transmitted on SP2 TWT LL. A default rule is predefined between STA1 and AP1, and / or a default rule is predefined between STA2 and AP2: the link on which the SP TWT LL starts first is the leader link. Therefore, in Figure 21, link 1 is configured as the leader link and link 2 is configured as the follower link. In Realization 9, SP1 TWT LL is established on link 1 and SP2 TWT LL is established on link 2. As shown in FIG. 22, there is a region of partial overlap between SP1 TWT LL and SP2 TWT LL. When SP1 TWT LL is initiated, the affiliated STA cannot compete for the channel but must wait for an activation frame from the affiliated AP. The MLD AP decides which link is the leader and which is the follower based on the real-time status of both links and transmits an activation frame to the affiliated AP to inform the corresponding affiliated STA. The activation frame acts only as a "notification" and does not require an acknowledgment (ACK). If the information contained in the activation frame received by the STA indicates that the link it resides on is the leader link, then the STA can immediately use the EDCA mechanism to compete for the channel. In FIG.22. When SP1 TWT LL starts, since STA2 is in a standby state, link 1 must be the leading link at this time. Upon receiving this information, station STA1 begins contending for the channel, and once the contention is successful, it initiates the uplink transmission. Since the uplink PPDU1 exceeds the SP2 TWT LL start time, AP2 should not transmit a wake-up frame to STA2 at the start time. Instead, it should adopt a method like rule-b and not transmit the wake-up frame until the downlink transmission begins on link 1. The goal is to avoid the out-of-bounds (OOB) problem. If the wake-up frame transmitted by AP2 is intended to inform STA2 that link 2 is the leading link at this time, then STA1 should stop channel contention and data transmission and will not synchronize with STA2 until STA2 initiates the uplink transmission. In Realization 10, SP1 TWT LL is established on link 1 and SP2 TWT LL is established on link 2. As shown in FIG. 23, there is a region of partial overlap between SP1 TWT LL and SP2 TWT LL. AP1 and AP2 inform STA1 and STA2 of the leader / follower information through a management frame (management frame) before the SP TWTs start, as shown in FIG. 23. AP1 and AP2 inform STA1 and STA2 that link 1 is the leader link and link 2 is the follower link, respectively. The embodiments of the method in this disclosure have been described in detail above with reference to FIGS. 10-23, and the embodiments of the apparatus in this disclosure will be described in detail below with reference to FIGS. 24-25. It can be seen that the embodiments of the apparatus and the embodiments of the method correspond to each other, and for similar descriptions, reference may be made to the embodiments of the method. Figure 24 shows a schematic block diagram of a Wireless Communication Device 300 according to an unclaimed embodiment of the present disclosure. The Wireless Communication Device 300 is implemented in a non-access point multi-link device (non-AP MLD) comprising at least a first Station (STA) and a second STA. 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. As shown in Figure 24, the Wireless Communication Device 300 includes a communication unit 310 configured to perform data transmission on the first link and the second link when a first Low Latency Target Wake-Up Time (LLTWT) service period is established on the first link. In some implementations, a second SP TWT LL is established on the second link. The first SP TWT LL and the second SP TWT LL completely overlap in the time domain. The first SP TWT LL and the second SP TWT LL may partially overlap in the time domain, or they may not overlap at all. In some embodiments, the first SP TWT LL and the second SP TWT LL may overlap totally or partially in the time domain, and the 310 communication unit may be configured to: When the first link and second link of the non-AP MLD belong to a non-simultaneous transmit and receive (NSTR) link pair, perform data transmission on the first link and second link in accordance with a leader / follower transmission mode on the first link and second link. In some implementations, the leader / follower transmission mode can be configured to be enabled within the first SP TWT LL and the second SP TWT LL, and the leader / follower transmission mode can be configured to be disabled outside of the first SP TWT LL and the second SP TWT LL. In some implementations: In a region of the second SP TWT LL that overlaps the first SP TWT LL in the time domain, when the first link is in leader transmission mode, the second link is in follower transmission mode, the second AP and / or the second STA do not actively transmit data, and the second AP and / or the second STA passively perform synchronous transmission or stop transmitting and receiving data in accordance with the transmission on the first link; In a region of the first SP TWT LL that overlaps the second SP TWT LL in the time domain, when the first link is in follower transmission mode, the second link is in leader transmission mode, the first AP and / or the first STA do not actively transmit data, and the first AP and / or the first STA passively perform synchronous transmission or stop transmitting and receiving data in accordance with the transmission on the second link; When the first AP and / or the first STA performs a data transmission in a region of the first SP TWT LL, and the second AP and / or the second STA is in a region that overlaps the first SP TWT LL in the time domain but is not within the second SP TWT LL, the second AP and / or the second STA does not actively transmit data, and the second AP and / or the second STA performs a passive synchronous transmission or stops transmitting and receiving data in accordance with the transmission on the first link; or When the second AP and / or the second STA performs a data transmission in a region of the second SP TWT LL, and the first AP and / or the first STA is in a region that overlaps the second SP TWT LL in the time domain but is not within the first SP TWT LL, the second AP and / or the second STA does not actively transmit data, and the second AP and / or the second STA performs a passive synchronous transmission or stops transmitting and receiving data in accordance with the transmission on the first link. In some implementations, an SP TWT LL cannot be established on the second link, and the 310 communication unit can be configured to: In implementation, when the first and second links of the non-AP MLD belong to an NSTR link pair, data transmission on the first and second links occurs at least within the time frame of the first SP TWT LL, according to a leader / follower transmission mode on the first and second links. In some implementations, when the first link is in leader transmission mode and the second link is in follower transmission mode, the second AP and / or the second STA may not actively transmit data on the second link within the time frame of the first SP TWT LL, and the second AP and / or the second STA may perform synchronous transmission or halt data transmission and reception within the time frame of the first SP TWT LL in accordance with the transmission on the first link. In some implementations, the leader / follower transmission mode of the first link can be controlled by the first AP and / or the first STA, and / or the leader / follower transmission mode of the second link can be controlled by the second AP and / or the second STA. In some implementations, the leader / follower transmission mode of the first link can be controlled by the first AP by instructing the first STA through an activation frame or a management frame, and / or the leader / follower transmission mode of the second link can be controlled by the second AP by instructing the second STA through an activation frame or a management frame. In some implementations, the leader / follower transmission mode of the first link can be indicated by the value of a variable in an SP TWT LL module in the first AP. The SP TWT LL module in the first AP may include a first information field and / or a second information field. A variable value in the first information field can indicate whether the leader / follower transmission mode should be enabled, and a variable value in the second information field can indicate whether the first link is in leader or follower transmission mode. In some implementations, the leader / follower transmission mode of the first link can be indicated by the value of a variable in an SP TWT LL module in the first STA. The SP TWT LL module in the first STA may include a third information field and / or a fourth information field. A variable value in the third information field can indicate whether the leader / follower transmission mode should be enabled, and a variable value in the fourth information field can indicate whether the first link is in leader or follower transmission mode. In some implementations, the leader / follower transmission mode of the second link can be indicated by the value of a variable in an SP TWT LL module in the second AP. The SP TWT LL module in the second AP may include a fifth information field and / or a sixth information field. A variable value in the fifth information field can indicate whether the leader / follower transmission mode should be enabled, and a variable value in the sixth information field can indicate whether the second link is in leader or follower transmission mode. In some implementations, the leader / follower transmission mode of the second link can be indicated by the value of a variable in an SP TWT LL module in the second STA. The SP TWT LL module in the second STA may include a seventh information field and / or an eighth information field; the value of a variable in the seventh information field can indicate whether the leader / follower transmission mode should be enabled, and the value of a variable in the eighth information field can indicate whether the second link is in leader or follower transmission mode. In some embodiments, the 300 wireless communication device may also include a 320 processing unit. The 310 communication unit can also be configured to receive the first indication information transmitted by the first AP or the second AP via an activation frame or a management frame, the first indication information indicating a transmission mode of the first link. The 320 processing unit can be configured to set the first link's leader / follower transmission mode according to the first indication information. In some embodiments, the transmission mode of the first link can be determined based on at least one of the priority of a service transmitted on the first SP TWT LL, the priority of a service transmitted on the second SP TWT LL, the start time of the first SP TWT LL, the start time of the second SP TWT LL, the link-state information of the first link, and the link-state information of the second link. In some embodiments, the transmission mode of the first link and / or the second link can be determined according to a predetermined condition. In some implementations, the default condition may include: When the priority of the service transmitted on the first SP TWT LL is less than the priority of the service transmitted on the second SP TWT LL, the first link is in follower transmission mode and the second link is in leader transmission mode; When the priority of the service transmitted on the first SP TWT LL is higher than the priority of the service transmitted on the second SP TWT LL, the first link is in leader transmission mode and the second link is in follower transmission mode; When the priority of the service transmitted on the first SP TWT LL is the same as the priority of the service transmitted on the second SP TWT LL, and the start time of the first SP TWT LL is later than the start time of the second SP TWT LL, the first link is in follower transmission mode and the second link is in leader transmission mode; or When the priority of the service transmitted on the first SP TWT LL is the same as the priority of the service transmitted on the second SP TWT LL, and the start time of the first SP TWT LL is earlier than the start time of the second SP TWT LL, the first link is in leader transmission mode and the second link is in follower transmission mode. In some implementations, the default condition may be agreed upon in a protocol, or the default condition may be agreed upon by the first AP and the second AP. In some implementations, the transmission mode of the first link and / or the second link can be determined according to the priorities of the services transmitted on the first SP TWT LL and the second SP TWT LL. In some implementations, when the priority of the service transmitted on the first SP TWT LL is lower than the priority of the service transmitted on the second SP TWT LL, the first link may be in follower transmission mode and the second link may be in leader transmission mode; or When the priority of the service transmitted on the first SP TWT LL is higher than the priority of the service transmitted on the second SP TWT LL, the first link can be in leader transmission mode and the second link can be in follower transmission mode. In some embodiments, when the priority of the service transmitted on the first SP TWT LL is the same as the priority of the service transmitted on the second SP TWT LL, the transmission mode of the first link and / or the second link can be determined according to the start time of the first SP TWT LL and the start time of the second SP TWT LL. In some implementations, when the priority of the service transmitted on the first SP TWT LL is the same as the priority of the service transmitted on the second SP TWT LL, and the start time of the first SP TWT LL is later than the start time of the second SP TWT LL, the first link may be in a follower transmission mode and the second link may be in a leader transmission mode; or When the priority of the service transmitted on the first SP TWT LL is the same as the priority of the service transmitted on the second SP TWT LL, and the start time of the first SP TWT LL is earlier than the start time of the second SP TWT LL, the first link can be in leader transmission mode and the second link can be in follower transmission mode. In some implementations, when both the first and second SP TWT LL are SP TWT LL enabled for activation, the leader / follower transmission mode of the first link can be controlled by the first AP, and / or the leader / follower transmission mode of the second link can be controlled by the second AP. In some implementations, when the first link is in follower transmission mode and the second link is in leader transmission mode, and the first STA cannot load an uplink buffer in time, the service period of the first SP TWT LL can be configured to extend at least to cover a region where the uplink buffer of the first STA is constrained. In some implementations, when the first link is in follower transmission mode and the second link is in leader transmission mode, and the first STA cannot load a downlink buffer in time, the service period of the first SP TWT LL can be configured to extend to cover at least one region where the downlink buffer of the first STA is restricted. In some implementations, the 310 communication unit can be configured to: Perform, when the first SP TWT LL and the second SP TWT LL have the same start time, the same end time, and the same TWT LL parameter, synchronous transmission on the first SP TWT LL and the second SP TWT LL without configuring the leader / follower transmission mode on the first link and the second link. In some embodiments, the first SP TWT LL and the second SP TWT LL partially overlap in the time domain, and the wireless communication device 300 may further include a processing unit 320 configured to: Release, when the first link is in follower transmission mode, the second link is in leader transmission mode, and data transmission on the first SP TWT LL has ended before the start time of the second SP TWT LL, the remaining service time of the first SP TWT LL. In some implementations, the first SP TWT LL and the second SP TWT LL may not overlap in the time domain as scheduled by the first AP or the second AP. In some implementations, the first SP TWT LL and the second SP TWT LL may not overlap in the time domain as scheduled by the first AP at the request of the first STA; or The first SP TWT LL and the second SP TWT LL cannot overlap in the time domain as scheduled by the second AP at the request of the second STA. In some embodiments, the first SP TWT LL and the second SP TWT LL may not overlap in the time domain, as indicated by at least one reserved bit in a control field in a target wake time (TWT) element. In some embodiments, the first SP TWT LL and the second SP TWT LL partially overlap in the time domain, and the wireless communication device 300 may further include a processing unit 320 configured to: to terminate a transmission opportunity (TXOP) on the first link before the start time of the second SP TWT LL, or to abandon a TXOP on the first link that has not terminated before the start time of the second SP TWT LL. In some implementations, when both the first SP TWT LL and the second SP TWT LL are SP TWT LL enabled for activation, a last transmission scheduled for the first SP TWT LL before the start time of the second SP TWT LL may end before the start time of the second SP TWT LL. In some embodiments, the first SP TWT LL and the second SP TWT LL partially overlap in the time domain, and the wireless communication device 300 may further include a processing unit 320 configured to: Release, when the data transmission in the first SP TWT LL has finished before the start time of the second SP TWT LL, the remaining time of the first SP TWT LL. In some implementations, the priority of a service transmitted on the first SP TWT LL may be lower than the priority of a service transmitted on the second SP TWT LL. Optionally, in some embodiments, the preceding communication unit may be a communication interface or transceiver, or an input / output interface of a communication chip or system-on-a-chip. The preceding processing unit may consist of one or more processors. It can be seen that the wireless communication device 300 according to the implementation of this disclosure may correspond to the non-AP MLD in the implementation of the method of this disclosure, and the above operations and / or functions and others of the respective units in the wireless communication device 300 are provided for the purpose of implementing the process flow corresponding to the non-AP MLD in method 200 shown in FIG.10, and the details thereof will not be omitted here for brevity. Figure 25 is a schematic block diagram of a Wireless Communication Device 400 according to an unclaimed embodiment of this disclosure. The Wireless Communication Device 400 is implemented in a Multi-Link Access Point Device (MLD AP) comprising at least a first access point (AP) and a second AP. 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. As shown in Figure 25, the Wireless Communication Device 400 includes: A 410 communication unit configured to perform data transmission on the first link and the second link when a first Low Latency Target Wake-Up Time (SP TWT LL) service period is established on the first link. In some implementations, a second SP TWT LL is established on the second link. The first SP TWT LL and the second SP TWT LL completely overlap in the time domain. The first SP TWT LL and the second SP TWT LL may partially overlap in the time domain, or they may not overlap at all. In some embodiments, the first SP TWT LL and the second SP TWT LL may overlap totally or partially in the time domain, and the communication unit 410 may be configured to: When the first link and second link of the non-AP MLD belong to a non-simultaneous transmit and receive (NSTR) link pair, data transmission on the first link and second link is performed according to a leader / follower transmission mode on the first link and second link. In some implementations, the leader / follower transmission mode can be configured to be enabled within the first SP TWT LL and the second SP TWT LL, and the leader / follower transmission mode can be configured to be disabled outside of the first SP TWT LL and the second SP TWT LL. In some implementations: In a region of the second SP TWT LL that overlaps the first SP TWT LL in the time domain, when the first link is in leader transmission mode, the second link may be in follower transmission mode, the second AP and / or the second STA may not actively transmit data, and the second AP and / or the second STA may passively perform synchronous transmission or stop transmitting and receiving data according to the transmission on the first link; In a region of the first SP TWT LL that overlaps the second SP TWT LL in the time domain, when the first link is in follower transmission mode, the second link may be in leader transmission mode, the first AP and / or the first STA may not actively transmit data, and the first AP and / or the first STA may passively perform synchronous transmission or stop transmitting and receiving data according to the transmission on the second link; When the first AP and / or the first STA performs a data transmission in a region of the first SP TWT LL, and the second AP and / or the second STA is in a region that overlaps the first SP TWT LL in the time domain but is not within the second SP TWT LL, the second AP and / or the second STA cannot actively transmit data, and the second AP and / or the second STA can perform a passive synchronous transmission or stop transmitting and receiving data in accordance with the transmission on the first link; or When the second AP and / or the second STA performs a data transmission in a region of the second SP TWT LL, and the first AP and / or the first STA is in a region that overlaps the second SP TWT LL in the time domain, but is not within the first SP TWT LL, the second AP and / or the second STA may not actively transmit data, and may perform a passive synchronous transmission or stop transmitting and receiving data according to the transmission on the first link. In some implementations, an SP TWT LL cannot be established on the second link, and the 410 communication unit can be configured to: In implementation, when the first and second links of the non-AP MLD belong to an NSTR link pair, data transmission on the first and second links occurs at least within the time frame of the first SP TWT LL, following a leader / follower transmission mode. In some implementations, when the first link is in leader mode, the second link may be in follower mode. The second AP and / or the second STA may not actively transmit data on the second link within the time frame of the first SP TWT LL, and the second AP and / or the second STA may perform synchronous transmission or halt data transmission and reception within the time frame of the first SP TWT LL, in accordance with the transmission on the first link. In some implementations, the leader / follower transmission mode of the first link can be controlled by the first AP and / or the first STA, and / or the leader / follower transmission mode of the second link can be controlled by the second AP and / or the second STA. In some implementations, the leader / follower transmission mode of the first link can be controlled by the first AP by instructing the first STA through an activation frame or a management frame, and / or the leader / follower transmission mode of the second link can be controlled by the second AP by instructing the second STA through an activation frame or a management frame. In some implementations, the leader / follower transmission mode of the first link can be indicated by the value of a variable in an SP TWT LL module in the first AP. The SP TWT LL module in the first AP may include a first information field and / or a second information field. A variable value in the first information field can indicate whether the leader / follower transmission mode should be enabled, and a variable value in the second information field can indicate whether the first link is in leader or follower transmission mode. In some implementations, the leader / follower transmission mode of the first link can be indicated by the value of a variable in an SP TWT LL module in the first STA. The SP TWT LL module in the first STA may include a third information field and / or a fourth information field. A variable value in the third information field can indicate whether the leader / follower transmission mode should be enabled, and a variable value in the fourth information field can indicate whether the first link is in leader or follower transmission mode. In some implementations, the leader / follower transmission mode of the second link can be indicated by the value of a variable in an SP TWT LL module in the second AP. The SP TWT LL module in the second AP may include a fifth information field and / or a sixth information field. A variable value in the fifth information field can indicate whether the leader / follower transmission mode should be enabled, and a variable value in the sixth information field can indicate whether the second link is in leader or follower transmission mode. In some implementations, the leader / follower transmission mode of the second link can be indicated by the value of a variable in an SP TWT LL module in the second STA. The SP TWT LL module in the second STA may include a seventh information field and / or an eighth information field; the value of a variable in the seventh information field can indicate whether the leader / follower transmission mode should be enabled, and the value of a variable in the eighth information field can indicate whether the second link is in leader or follower transmission mode. In some embodiments, the 400 wireless communication device may further include a 420 processing unit configured to determine a first link transmission mode based on at least one of the priority of a service transmitted on the first SP TWT LL, priority of a service transmitted on the second SP TWT LL, start time of the first SP TWT LL, start time of the second SP TWT LL, first link link status information, and second link link status information. In some implementations, the 410 communication unit can also be configured to first provide information to the non-AP MLD via an activation frame or a management frame, with the first information indicating the transmission mode of the first link. In some embodiments, the transmission mode of the first link and / or the second link can be determined according to a predetermined condition. In some implementations, the default condition may include: When the priority of the service transmitted on the first SP TWT LL is less than the priority of the service transmitted on the second SP TWT LL, the first link is in follower transmission mode and the second link is in leader transmission mode; When the priority of the service transmitted on the first SP TWT LL is higher than the priority of the service transmitted on the second SP TWT LL, the first link is in leader transmission mode and the second link is in follower transmission mode; When the priority of the service transmitted on the first SP TWT LL is the same as the priority of the service transmitted on the second SP TWT LL, and the start time of the first SP TWT LL is later than the start time of the second SP TWT LL, the first link is in follower transmission mode and the second link is in leader transmission mode; or When the priority of the service transmitted on the first SP TWT LL is the same as the priority of the service transmitted on the second SP TWT LL, and the start time of the first SP TWT LL is earlier than the start time of the second SP TWT LL, the first link is in leader transmission mode and the second link is in follower transmission mode. In some implementations, the default condition may be agreed upon in a protocol, or the default condition may be agreed upon by the first AP and the second AP. In some implementations, the transmission mode of the first link and / or the second link can be determined according to the priorities of the services transmitted on the first SP TWT LL and the second SP TWT LL. In some implementations, when the priority of the service transmitted on the first SP TWT LL is lower than the priority of the service transmitted on the second SP TWT LL, the first link may be in follower transmission mode and the second link may be in leader transmission mode; or When the priority of the service transmitted on the first SP TWT LL is higher than the priority of the service transmitted on the second SP TWT LL, the first link can be in leader transmission mode and the second link can be in follower transmission mode. In some embodiments, when the priority of the service transmitted on the first SP TWT LL is the same as the priority of the service transmitted on the second SP TWT LL, the transmission mode of the first link and / or the second link can be determined according to the start time of the first SP TWT LL and the start time of the second SP TWT LL. In some implementations, when the priority of the service transmitted on the first SP TWT LL is the same as the priority of the service transmitted on the second SP TWT LL, and the start time of the first SP TWT LL is later than the start time of the second SP TWT LL, the first link may be in a follower transmission mode and the second link may be in a leader transmission mode; or When the priority of the service transmitted on the first SP TWT LL is the same as the priority of the service transmitted on the second SP TWT LL, and the start time of the first SP TWT LL is earlier than the start time of the second SP TWT LL, the first link can be in leader transmission mode and the second link can be in follower transmission mode. In some implementations, when both the first and second SP TWT LL are SP TWT LL enabled for activation, the leader / follower transmission mode of the first link can be controlled by the first AP, and / or the leader / follower transmission mode of the second link can be controlled by the second AP. In some implementations, when the first link is in follower transmission mode and the second link is in leader transmission mode, and the first STA cannot load an uplink buffer in time, the service period of the first SP TWT LL can be configured to extend at least to cover a region where the uplink buffer of the first STA is constrained. In some implementations, when the first link is in follower transmission mode and the second link is in leader transmission mode, and the first STA cannot load a downlink buffer in time, the service period of the first SP TWT LL can be configured to extend to cover at least one region where the downlink buffer of the first STA is restricted. In some implementations, the 410 communication unit can be configured to: Perform, when the first SP TWT LL and the second SP TWT LL have the same start time, the same end time, and the same TWT LL parameter, synchronous transmission on the first SP TWT LL and the second SP TWT LL without configuring the leader / follower transmission mode on the first link and the second link. In some implementations, the first SP TWT LL and the second SP TWT LL may not overlap in the time domain. In some implementations, the first SP TWT LL and the second SP TWT LL may not overlap in the time domain as scheduled by the first AP or the second AP. In some implementations, the first SP TWT LL and the second SP TWT LL may not overlap in the time domain as scheduled by the first AP at the request of the first STA; or The first SP TWT LL and the second SP TWT LL may not overlap in the time domain as scheduled by the second AP at the request of the second STA. In some implementations, the first SP TWT LL and the second SP TWT LL may not overlap in the time domain, as indicated by at least one reserved bit in a control field in a target wake time (TWT) element. In some implementations, the first SP TWT LL and the second SP TWT LL partially overlap in the time domain, and When both the first SP TWT LL and the second SP TWT LL are SP TWT LL with activation enabled, the processing unit 420 can be configured to ensure that the last transmission scheduled for the first SP TWT LL before the start time of the second SP TWT LL ends before the start time of the second SP TWT LL. In some implementations, the priority of a service transmitted on the first SP TWT LL may be lower than the priority of a service transmitted on the second SP TWT LL. Optionally, in some embodiments, the preceding communication unit may be a communication interface or transceiver, or an input / output interface of a communication chip or system-on-a-chip. The preceding processing unit may consist of one or more processors. It can be seen that the wireless communication device 400 according to the implementation of this disclosure may correspond to the MLD AP in the implementation of the method of this disclosure, and the above operations and / or functions and others of the respective units in the wireless communication device 400 are provided for the purpose of implementing the process flow corresponding to the MLD AP in method 200 shown in FIG.10, and the details thereof will not be omitted here for brevity. Figure 26 is a schematic diagram showing the structure of a 500 communication device according to an embodiment of this disclosure. The 500 communication device shown in Figure 26 includes a 510 processor, and the 510 processor can invoke and execute a computer program from memory to implement the method in the embodiment of this disclosure. In some embodiments, as shown in FIG. 26, the communication device 500 may further include a memory 520. The processor 510 may invoke and execute a computer program from memory 520 to implement the method in the embodiment of the present disclosure. The 520 memory can be a separate device independent of the 510 processor, or it can be integrated into the 510 processor. In some unclaimed embodiments, as shown in FIG. 26, the communication device 500 may further include a transceiver 530, and the processor 510 may control the transceiver 530 to communicate with other devices and, in particular, to transmit information or data to other devices, or to receive information or data transmitted by other devices. Here, the 530 transceiver may include a transmitter and a receiver. The 630 transceiver may also include one or more antennas. In some embodiments, the 500 communication device may specifically be the non-AP MLD according to the embodiment of this disclosure, and the 500 communication device may implement the corresponding processes implemented by the non-AP MLD in any of the methods according to the embodiments of this disclosure. For brevity, details will be omitted here. In some embodiments, the communication device 500 may specifically be the MLD AP according to the embodiment of this disclosure, and the communication device 500 may implement the corresponding processes implemented by the MLD AP in any of the methods according to the embodiments of this disclosure. For brevity, details will be omitted here. Figure 27 is a schematic diagram showing the structure of an apparatus according to an embodiment of the present invention. The apparatus 600 shown in Figure 27 includes a processor 610, and the processor 610 can invoke and execute a computer program from memory to implement the method in the embodiment of the present disclosure. In some embodiments, as shown in FIG. 26, the apparatus 600 may further include a memory 620. The processor 610 may invoke and execute a computer program from memory 620 to implement the method in the embodiment of the present disclosure. The 620 memory can be a separate device independent of the 610 processor, or it can be integrated into the 610 processor. In some unclaimed embodiments, the apparatus 600 may further include an input interface 630. The processor 610 can control the input interface 630 to communicate with other devices or chips and, in particular, obtain information or data transmitted by other devices or chips. In some unclaimed 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, in particular, to send information or data to other devices or chips. In some embodiments, the apparatus may be applied to the non-AP MLD in the embodiment of this disclosure, and the apparatus may implement the corresponding processes implemented by the non-AP MLD in the various methods of the embodiments of this disclosure. For brevity, details will be omitted here. In some embodiments, the apparatus may be applied to the MLD AP in the embodiment of this disclosure, and the apparatus may implement the corresponding processes implemented by the MLD AP in the various methods of the embodiments of this disclosure. For brevity, details will be omitted here. In some unclaimed embodiments, the apparatus in the embodiment of the present disclosure may be a chip, such as a system-level chip, a system chip, a system-on-a-chip, or a system-on-a-chip. Figure 28 is a schematic block diagram showing a 700 communication system according to one embodiment of the present disclosure. As shown in Figure 28, the 700 communication system includes a non-AP MLD 710 and an AP MLD 720. Here, the non-AP MLD 710 can be configured to implement the corresponding functions implemented by the non-AP MLD in the previous method, and the AP MLD 720 can be configured to implement the corresponding functions implemented by the AP MLD in the previous method. For brevity, details will be omitted here. It should be noted that the processor in the embodiment of this disclosure may be an integrated circuit chip with signal processing capabilities. In an implementation, the steps of the embodiments of the previous method may be implemented by means of hardware integrated logic circuits in a processor or by means of software instructions.The processor may be a general-purpose processor, a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a field-programmable gate array (FPGA) or other programmable logic device, a discrete gate or transistor logic device, or a discrete hardware component. The methods, steps, and logic block diagrams described in the embodiments of this disclosure may be implemented or carried out. The general-purpose processor may be a microprocessor or any conventional processor. The steps of the methods described in the embodiments of this disclosure may be implemented directly as performed and completed by a hardware decoding processor, or by a combination of hardware and software modules within the decoding processor.Software modules can be located on a storage medium known in the related art, such as random access memory, flash memory, read-only memory, programmable read-only memory, electrically erasable programmable memory, or a register. The storage medium can be located in memory, and the processor can read information from memory and perform the steps of the preceding methods in conjunction with its hardware. It can be seen that the memory in the embodiments of this disclosure may be volatile or non-volatile memory, or may include both. In this case, the non-volatile memory may be read-only memory (ROM), programmable ROM (PROM), erasable PROM (EPROM), electrically erasable EPROM (EEPROM), or flash memory. The volatile memory may be random-access memory (RAM), which is used as an external cache. By way of illustration, and not limitation, there are many types of RAM, including static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), double data rate SDRAM (DDR SDRAM), enhanced SDRAM (ESDRAM), synclink DRAM (SLDRAM), and direct bus RAM (DR RAM). It should be noted that the memory used for the system and method described in this disclosure is intended to include, but is not limited to, these and any other suitable types of memory. It can be seen that the preceding memories are merely illustrative and do not limit the present disclosure. For example, the memory in the implementation of this disclosure could also be static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), double data rate SDRAM (DDR SDRAM), enhanced SDRAM (ESDRAM), synchronous link DRAM (SLDRAM), or direct RAM bus RAM (DR RAM). That is, the memory in the embodiments of this disclosure is intended to include, but is not limited to, these and any other suitable memory types. An implementation of this disclosure also provides a computer-readable storage medium for storing a computer program. In some embodiments, the computer-readable storage medium can be applied to the access point device in the embodiment of this disclosure, and the software can cause a computer to perform the corresponding procedures implemented by the access point device in the method according to any of the embodiments of this disclosure. Details therein are omitted here for simplicity. In some embodiments, the computer-readable storage medium can be applied to the stationary device in the embodiment of this disclosure, and the software can cause a computer to perform the corresponding procedures implemented by the stationary device in the method according to any of the embodiments of this disclosure. Details therein are omitted here for simplicity. An unclaimed embodiment of this disclosure also provides a computer program product that includes computer program instructions. In some embodiments, the product of the software program can be applied to the access point device in the embodiment of this disclosure, and the instructions in the software program can cause a computer to perform the corresponding procedures implemented by the access point device in the method according to any of the embodiments of this disclosure. Details therein are omitted here for simplicity. In some embodiments, the product of the software program can be applied to the stationary device in the embodiment of this disclosure, and the instructions in the software program can cause a computer to perform the corresponding procedures implemented by the stationary device in the method according to any of the embodiments of this disclosure. Details therein are omitted here for simplicity. An unclaimed embodiment of this disclosure also provides a computer program. In some embodiments, the software may be applied to the access point device in the embodiment of this disclosure. When executed on a computer, the software may cause the computer to perform the corresponding procedures implemented by the access point device in the method according to any of the embodiments of this disclosure. Details regarding this are omitted here for simplicity. In some embodiments, the software may be applied to the station device in the embodiment of this disclosure. When executed on a computer, the software may cause the computer to perform the corresponding procedures implemented by the station device in the method according to any of the embodiments of this disclosure. Details regarding this are omitted here for simplicity. Those with expertise in the subject matter will appreciate that the units and steps of the algorithm in the examples described in relation to the implementations disclosed herein can be implemented in electronic hardware or any combination of computer software and electronic hardware. The execution of these functions using hardware or software depends on the specific applications and the design conditions of the technical solutions. Those with expertise in the subject matter may use different methods for each specific application to implement the described functions, and such implementation must fall within the scope of this disclosure. Those with knowledge of the subject will clearly understand that, for convenience and brevity of description, for the specific operational processes of the systems, devices and units described above, reference can be made to the corresponding processes in the previous embodiments of the method, and the details of these will be omitted here. In the realizations described herein, it can be seen that the disclosed systems, devices, and methods may be implemented in other ways. For example, the device configurations described above are merely illustrative. For example, the divisions of the units are only divisions based on logical functions, and there may be other divisions in actual implementations. For example, several units or components may be combined or integrated into another system, or some features may be ignored or omitted. Furthermore, the mutual coupling, direct coupling, or communicative connection shown or discussed may be indirect coupling or a communicative connection between devices or units through interfaces that may be electrical, mechanical, or of any other form. The units described as separate components may or may not be physically separate, and the components shown as units may or may not be physical units; that is, they may be located in the same place or distributed across several network elements. Some or all of the units may be selected according to the actual needs to achieve the objectives of the implementation solutions. Furthermore, the functional units in the embodiments of this disclosure may be integrated into a processing unit, or alternatively be separate physical modules, or two or more units may be integrated into a single unit. When the function is implemented as a functional software unit and sold or used as a standalone product, it can be stored on a computer-readable storage medium. Based on this understanding, all or part of the technical solutions according to the embodiments in this disclosure, or the part thereof that contributes to the prior art, can be incorporated into a software product. The computer software product can be stored on a storage medium and contain instructions to enable a computing device, such as a personal computer, server, or network device, etc., to perform all or part of the steps of the method described in each embodiment of this disclosure.The storage medium may include a USB flash drive, a portable hard drive, read-only memory (ROM), random access memory (RAM), a magnetic disk, an optical disk, or any other medium capable of storing program code.

Claims

1. A wireless communication method, applied in a non-access point multi-link device, non-AP MLD, comprising at least a first station, STA, and a second STA, the first STA forming 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 forming a second link with a second AP in the AP MLD, the method comprising: performing (S210), by the non-AP MLD, data transmission on the first link and the second link, when a first low-latency target wake-up time service period, SP TWT LL, is established on the first link, characterized in that, in the event that a second SP TWT LL is established on the second link, the first SP TWT LL and the second SP TWT LL completely overlap in the time domain. 2.The method according to claim 1, wherein the second SP TWT LL is established on the second link, and the first SP TWT LL and the second SP TWT LL completely overlap in the time domain, comprises: the first SP TWT LL and the second SP TWT LL have the same start time and end time and have the same TWT LL parameter.

3. The method according to claim 1, wherein, in the event that the second SP TWT LL is established on the second link, performing said (S210) by the non-AP MLD, the transmission of data on the first link and the second link comprises: performing, by the non-AP MLD when the first and second links of the non-AP MLD belong to a non-simultaneous transmit and receive link pair (NSTR), the transmission of data on the first and second links according to an active / passive mode on the first and second links. 4.The method according to claim 3, wherein, in the event that the second SP TWT LL is established on the second link: in a region where the second SP TWT LL completely overlaps the first SP TWT LL in the time domain, when the first link is in active mode, the second link is in passive mode, the second AP and / or the second STA passively transmit data, and the second AP and / or the second STA passively perform synchronous transmission or stop data transmission and reception depending on the transmission on the first link; or in a region where the first SP TWT LL completely overlaps the second SP TWT LL in the time domain, when the first link is in passive mode, the second link is in active mode, the first AP and / or the first STA passively transmit data, and the first AP and / or the first STA passively perform synchronous transmission or stop data transmission and reception depending on the transmission on the second link. 5.The method according to claim 3 or 4, wherein the active / passive mode of the first link is controlled by the first AP and / or the first STA, and / or the active / passive mode of the second link is controlled by the second AP and / or the second STA.

6. The method according to claim 3 or 4, wherein the active / passive mode of the first link is controlled by the first AP instructing the first STA via an activation frame or a management frame, and / or the active / passive mode of the second link is controlled by the second AP instructing the second STA via an activation frame or a management frame. 7.The method according to any of claims 3 to 5, wherein the active / passive mode of the first link is indicated by the value of a variable in an SP TWT LL module in the first AP, wherein the SP TWT LL module in the first AP comprises a first information field and / or a second information field, a value of a variable in the first information field indicates whether the active / passive mode is to be enabled, and a value of a variable in the second information field indicates whether the first link is in active or passive mode. 8.The method according to any of claims 3 to 6, wherein the active / passive mode of the first link is indicated by the value of a variable in an SP TWT LL module in the first STA, wherein the SP TWT LL module in the first STA comprises a third information field and / or a fourth information field, a value of a variable in the third information field indicates whether the active / passive mode is to be enabled, and a value of a variable in the fourth information field indicates whether the first link is in active or passive mode. 9.The method according to any of claims 3 to 5, wherein the active / passive mode of the second link is indicated by the value of a variable in an SP TWT LL module in the second AP, wherein the SP TWT LL module in the second AP comprises a fifth information field and / or a sixth information field, a value of a variable in the fifth information field indicates whether the active / passive mode should be enabled, and a value of a variable in the sixth information field indicates whether the second link is in active or passive mode. 10.The method according to any of claims 3 to 6, wherein the active / passive mode of the second link is indicated by the value of a variable in an SP TWT LL module in the second STA, wherein the SP TWT LL module in the second STA comprises a seventh information field and / or an eighth information field, a value of a variable in the seventh information field indicates whether the active / passive mode is to be enabled, and a value of a variable in the eighth information field indicates whether the second link is in active or passive mode. 11.A wireless communication method, applied in a multi-link access point device (MLD AP), comprising at least a first access point (AP) and a second AP, the first AP forming a first link with a first station (STA) in a multi-link non-access point device (MLD non-AP), associated with the first AP, and the second AP forming a second link with a second STA in the MLD non-AP; the method comprising: performing, by the MLD AP, data transmission on the first link and the second link when a first low-latency target wake-up time service period, SP TWT LL, is established on the first link, characterized in that, in the event that a second SP TWT LL is established on the second link, the first SP TWT LL and the second SP TWT LL completely overlap in the time domain. 12.The method according to claim 11, wherein the second SP TWT LL is established on the second link, and the first SP TWT LL and the second SP TWT LL completely overlap in one time domain, comprises: the first SP TWT LL and the second SP TWT LL having the same start time and end time and having the same TWT LL parameter.

13. A station device, comprising a processor (510) and a memory (520), wherein the memory (520) has a computer program stored therein, and the processor (510) is configured to invoke and execute the computer program stored in the memory (520) to perform the method according to any one of claims 1 to 10. 14.An access point device, comprising a processor (510) and a memory (520), wherein the memory (520) has a computer program stored therein, and the processor (510) is configured to invoke and execute the computer program stored in the memory (520) to perform the method according to claim 11 or 12.

15. A computer-readable storage medium, characterized in having stored therein a computer program that enables a computer to perform the method according to any one of claims 1 to 10.

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