CN115002861B

CN115002861B - Method, device, equipment and storage medium for switching multi-link terminal equipment

Info

Publication number: CN115002861B
Application number: CN202110223641.3A
Authority: CN
Inventors: 吴昊; 王鑫
Original assignee: Jimi Technology Co ltd
Current assignee: Jimi Technology Co ltd
Priority date: 2021-03-01
Filing date: 2021-03-01
Publication date: 2023-07-25
Anticipated expiration: 2041-03-01
Also published as: CN115002861A

Abstract

The invention discloses a method, a device, equipment and a storage medium for switching multi-link terminal equipment. The method comprises the following steps: the method comprises the steps that a logic entity I sends a link reconfiguration request signaling to a logic access point I of access equipment, wherein the link reconfiguration request signaling comprises parameters of Action type, dialogtoken, type, linkelement and Extension element; the logic entity I receives a link reconfiguration response signaling sent by the logic access point I; the first logic entity informs the high-level management entity that the access device receives the link reconfiguration request, and the high-level management entity instructs the second logic entity to execute the handover preparation operation; and the second logic entity executes the connection operation with the target access point, and after the connection is successful, the connection between the first logic entity and the first logic access point is disconnected. The invention makes the terminal equipment search the proper access point to switch under the premise of not disconnecting the original service, so that the terminal can maintain the continuity of the service when roaming among different access points.

Description

Method, device, equipment and storage medium for switching multi-link terminal equipment

Technical Field

The present invention relates to the field of wireless communications, and in particular, to a method, an apparatus, a device, and a storage medium for switching a multi-link terminal device.

Background

In the 802.11 system, an access device (AP STA) and a terminal device (Non-AP STA) are internally deployed with a MAC layer and a PHY layer, wherein main functions of the MAC layer include channel management, connection management, quality of service management, power control, time synchronization, and the like, and main functions of the PHY layer include modulation, coding, transmission, and the like.

Both the MAC layer and the PHY layer conceptually include management entities called a MAC layer management unit MLME (MAC sublayer management entity) and a physical layer management unit PLME (PHY sublayer management entity), respectively. These units provide low-level management service interfaces through which low-level management functions can be invoked.

In order to provide proper MAC operation, each STA (including Non-AP STA and AP STA) has a high-level management unit therein, such as SME (station management entity, device management unit), which means that the high-level management entity above the MAC layer is a layer-independent entity, which is located in a separate management plane.

Action of SME: typically, the unit is responsible for functions such as collecting layer-related states from various layer management units (MLME and PLME), and similarly, it will also set layer-specific parameter values. SMEs typically perform such functions on behalf of general system management entities. The layers interact through defined primitives.

802.11be networks, also known as Extremely High Throughput (EHT) networks, enhance functionality through a range of system characteristics and mechanisms to achieve extremely high throughput. As the use of Wireless Local Area Networks (WLANs) continues to grow, it is increasingly important to provide wireless data services in many environments, such as homes, businesses, and hotspots. In particular, video traffic will continue to be the dominant traffic type in many WLAN deployments. The throughput requirements of these applications are evolving due to the advent of 4k and 8k video (20 Gbps uncompressed rate). New high throughput, low latency applications such as virtual or augmented reality, gaming, remote offices, and cloud computing will proliferate (e.g., latency for real-time gaming is less than 5 milliseconds).

In view of the high throughput and stringent real-time delay requirements of these applications, users desire to support their applications over a WLAN with higher throughput, higher reliability, less delay and jitter, and higher power efficiency. Users desire improved integration with Time Sensitive Networks (TSNs) to support applications on heterogeneous ethernet and wireless LANs. The 802.11be network aims to ensure the competitiveness of WLAN by further improving the overall throughput and reducing the delay while ensuring backward compatibility and coexistence with legacy technology standards. 802.11 compatible devices operating in the 2.4GHz,5GHz and 6GHz frequency bands.

Disclosure of Invention

When a wireless lan link is caused, for example, when a terminal device is moving, the network is overloaded, the coverage of one AP (access point) may be called handover from the coverage of another AP, and usually, a single-link terminal device has to disconnect from an original AP and then establish a connection with a new AP because of only one link, which may cause service interruption. The characteristics of the multi-link terminal equipment enable the terminal equipment to simultaneously establish two or more links, so that the service continuity can be maintained when the terminal equipment roams among different APs in the link management and interactive control mode of the invention.

In a first aspect, an embodiment of the present invention provides a method for switching a multi-link terminal device, which is applied to a multi-link terminal device, where the multi-link terminal device includes a high-level management entity and at least two logic entities, where the at least two logic entities include a first logic entity and a second logic entity, and the method includes:

the method comprises the steps that a logic entity I sends a link reconfiguration request signaling to a logic access point I of access equipment, wherein the link reconfiguration request signaling comprises parameters of Action Type, dialog token, type, link element and Extension element, the parameter of Action Type is used for indicating the Type of a current process, the Dialog token is used for identifying the current process, the Type is used for indicating the Type of link reconfiguration, the link is set to be deleted, the link element is used for indicating link related parameters, and Extension element is used for indicating reconfiguration of other related parameters;

the logic entity I receives a link reconfiguration response signaling sent by the logic access point I;

the first logic entity informs the high-level management entity that the access device receives the link reconfiguration request, and the high-level management entity instructs the second logic entity to execute the handover preparation operation;

the second logic entity performs connection operation with the target access point, and after the connection is successful, the high-level management entity is informed that the high-level management entity is connected to the target access point, and the high-level management entity indicates the first logic entity to perform disconnection operation with the first logic access point;

the first logic entity performs a disconnection operation from the first logic access point.

In a second aspect, an embodiment of the present application provides a method for switching a multi-link terminal device, where the method includes:

the method comprises the steps that a logic access point of access equipment receives a link reconfiguration request signaling sent by a logic entity of multi-link terminal equipment, and executes operation according to parameters in the link reconfiguration request signaling, wherein the link reconfiguration request signaling comprises parameters of Action Type, dialogtoken, type, link element and Extension element, the parameter of Action Type is used for indicating the Type of a current process, the dialogtoken is used for identifying the current process, the Type of the link reconfiguration is indicated, the link is set to be deleted, the link element is used for indicating related parameters of the link, and Extension element is used for indicating reconfiguration of other related parameters;

the logic access point sends a link reconfiguration response signaling to the logic entity I;

the first logical access point performs a disconnection operation from the first logical entity.

In a third aspect, an embodiment of the present invention provides an apparatus for switching a multi-link terminal device, where the apparatus includes:

the first logic entity module is configured to send a link reconfiguration request signaling to a first logic access point of the access device through the logic entity, where the link reconfiguration request signaling includes parameters Action Type, dialogtoken, type, link element and Extension element, the parameter Action Type is used to indicate a Type of a current process, dialogtoken is used to identify the current process, the Type is used to indicate a Type of link reconfiguration, the link is set to delete, the link element is used to indicate a link related parameter, and Extension element is used to indicate reconfiguration of other related parameters;

the first logic entity module is further configured to receive, through the first logic entity, a link reconfiguration response signaling sent by the first logic access point;

the first logic entity module is further configured to notify a high-level management entity of the link reconfiguration request received by the access device through the first logic entity;

the high-level management entity module is used for indicating the second logic entity to execute the switching preparation operation through the high-level management entity;

the second logic entity module is used for executing the connection operation with the target access point through the second logic entity, and notifying the high-level management entity that the high-level management entity is connected to the target access point after the connection is successful;

the Gao Cengguan entity module is further configured to instruct, by the higher-layer management entity, the first logical entity to perform an operation of disconnecting from the first logical access point;

the first logic entity module is further configured to perform an operation of disconnecting from the first logic access point through the first logic entity.

In a fourth aspect, an embodiment of the present invention provides an apparatus for switching a multi-link terminal device, where the apparatus includes:

a first access point module, configured to receive, through a logical access point of an access device, a link reconfiguration request signaling sent by a logical entity of a multi-link terminal device, and execute an operation according to parameters in the link reconfiguration request signaling, where the link reconfiguration request signaling includes parameters Action Type, link element and Extension element, the parameter Action Type is used to indicate a Type of a current process, the Type is used to identify the current process, the Type is used to indicate a Type of link reconfiguration, the link element is set to delete a link, the link element is used to indicate a link related parameter, and Extension element is used to indicate reconfiguration of other related parameters;

the first access point module is further configured to send a link reconfiguration response signaling to the first logical entity through the logical access point;

the first access point module is further configured to perform an operation of disconnecting from the first logical entity through the first logical access point.

In a fifth aspect, an embodiment of the present invention provides an apparatus, where the apparatus includes a processor and a memory, where the memory stores at least one instruction, at least one section of program code, a code set, or an instruction set, and where the at least one instruction, at least one section of program code, a code set, or an instruction set is loaded and executed by the processor, to implement a method for switching a multi-link terminal device according to the first aspect, or implement a method for switching a multi-link terminal device according to the second aspect.

In a sixth aspect, an embodiment of the present invention provides a computer readable storage medium, where at least one instruction, at least one section of program code, a set of codes, or a set of instructions is stored, where the at least one instruction, at least one section of program code, a set of codes, or a set of instructions is loaded and executed by a processor, to implement a method for switching a multi-link terminal device according to the first aspect, or implement a method for switching a multi-link terminal device according to the second aspect.

In a seventh aspect, an embodiment of the present invention provides a wireless transmission system, where the wireless transmission system includes a multi-link terminal device and an access device, where the multi-link terminal device is configured to implement the method for switching between multi-link terminal devices according to the first aspect; the access device is configured to implement the method for handover of a multi-link terminal device according to the second aspect.

It should be noted that, the apparatus according to the third aspect is configured to perform the method provided in the first aspect, the apparatus according to the fourth aspect is configured to perform the method provided in the second aspect, the device according to the fifth aspect and the storage medium according to the sixth aspect are configured to perform the method provided in the first aspect, or are configured to perform the method provided in the second aspect, so that the same advantages as those of the method provided in the first aspect or the second aspect can be achieved, and embodiments of the present invention will not be repeated.

The invention provides a method, a device, equipment and a storage medium for reconfiguring a link of a multi-link terminal device, which enable the terminal device to search for a proper access point to switch on the premise of not disconnecting the original service, so that the continuity of the service can be maintained when the terminal roams among different access points.

Detailed Description

In order to better understand the technical solutions of the present invention, the following description will clearly and completely describe the technical solutions of the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present invention without making any inventive effort, shall fall within the scope of the present invention. Furthermore, while the present disclosure has been described in terms of an exemplary embodiment or embodiments, it should be understood that each aspect of the disclosure may be separately implemented as a complete solution. The following embodiments and features of the embodiments may be combined with each other without conflict.

In embodiments of the invention, words such as "exemplary," "such as" and the like are used to mean serving as an example, instance, or illustration. Any embodiment or design described herein as "exemplary" is not necessarily to be construed as preferred or advantageous over other embodiments or designs. Rather, the term use of an example is intended to present concepts in a concrete fashion.

Unless defined otherwise, technical or scientific terms used herein should be given the ordinary meaning as understood by one of ordinary skill in the art to which this invention belongs. The terms "first," "second," and the like, as used herein, do not denote any order, quantity, or importance, but rather are used to distinguish one from another, and the corresponding terms may or may not have the same meaning. The word "comprising" or "comprises", and the like, means that elements or items preceding the word are included in the element or item listed after the word and equivalents thereof, but does not exclude other elements or items.

In the embodiment of the present invention, both the terminal device and the access device include a low-level management entity and a high-level management entity, where the low-level management entity is a unit for managing and controlling data transmission of the device, such as MLME and PLME, and the high-level management entity is a unit for managing services or applications of the device, such as a device management unit SME and an application management unit AME (application management entity).

It should be noted that the multi-link device includes a plurality of logic entities, each logic entity performs data transmission through a link, and each logic entity includes an independent data transceiver module. A conventional single link device has only one logical entity and only one MAC address, while a multi-link device has one MAC address for each logical entity affiliated to the multi-link device, e.g., a multi-link device operates with 3 logical entities, then there are four MAC addresses on this physical device, one for the multi-link device and one for each of the three logical entities. In the embodiment of the invention, the address of the terminal can be the address of the terminal equipment, the address of the logic entity of the terminal equipment, and the address of the access point can be the address of the access equipment, and the address of the logic entity of the access equipment.

In the following exemplary embodiment, the multi-link terminal device non-AP MLD1 has two logical entities STA1 and STA2, currently connected to the multi-link access device AP MLD1, and connected to the logical access points AP1 and AP2 of the multi-link access device AP MLD1, respectively. In other embodiments, the non-AP MLD1 may have more than two logical entities, the AP MLD1 may have more than two logical entities, and the STA2 may not be connected to the access device, which may be regarded as a single link device, which is not limited in this respect by the present invention.

In the embodiment of the invention, the method for switching the multi-link terminal equipment comprises the following steps:

after the non-AP MLD1 is connected, the AP MLD1 sends a DS-STA-NOTIFY primitive to the server, and parameters included in the primitive are shown in table 1.

TABLE 1

Parameters (parameters)	Value of	Description of the invention
			STA address	Address of non-AP MLD1	Address of terminal
UpdateType	Add	Type of operation requested

2. After the server receives the DS-STA-NOTIFY primitive, the information is set up as shown in Table 2.

TABLE 2

STA	AP
		Address of non-AP MLD1	Address of AP MLD1

Sta1 scans for surrounding access points, and when the radio link changes, selects a target access point from the scanned access points, which in this embodiment is assumed to be AP3.

Sta1 sends link reconfiguration request signaling as link reconfiguration request frames to AP1, link reconfiguration request frames with parameter examples as shown in table 3.

TABLE 3 Table 3

Assume that the present embodiment uses STA2 to first switch to the target access point AP3, and link element settings are shown in table 4.

TABLE 4 Table 4

The parameters included in Extension element are shown in table 5.

TABLE 5

After the ap1 receives the link reconfiguration request frame, it performs the corresponding operation according to the parameters in the frame,

if the value of the Type is remove, searching information corresponding to the value of the STA address in a logic entity of the access device corresponding to the value of the AP address according to the information in the link element, deleting the information, and sending a link reconfiguration response signaling, such as link reconfiguration response frames to the STA1, wherein the frames contain parameters, such as Table 6.

TABLE 6

After receiving link reconfiguration response frames, STA1 determines whether it is a response corresponding to the request sent in step 5 according to the dialogtoken, if so, checks the Status code, if the value is SUCCESS, notifies the upper management entity of the non-AP MLD1, and the upper management entity of the non-AP MLD1 instructs STA2 to perform a handover preparation operation.

7. When the value of Type in link reconfiguration request frame is Remove, AP1 also looks at Cause, and if it is Transition or ML Transition, reads parameter Target BSS in Extension element, sends DS-MAP-NOTIFY primitive to server, and when AP3 belongs to single link device, parameters included in primitive are shown in table 7.

TABLE 7

When the AP3 belongs to the multi-link device, it is assumed to be the multi-link device AP MLD2, and parameters included in the primitive are shown in table 8.

TABLE 8

8. After receiving the DS-MAP-NOTIFY primitive, the server modifies the local information such as shown in table 9 or table 10, and simultaneously transmits data to be transmitted to the non-AP MLD1 to the AP MLD1 and the AP3, or the AP MLD1 and the AP MLD2 according to the updated information.

TABLE 9

STA	AP
		Address of non-AP MLD1	Address of AP MLD1
Address of STA2	Address of AP3

Table 10

STA	AP
		Address of non-AP MLD1	Address of AP MLD1
Address of non-AP MLD1	Address of AP MLD2

Next, STA2 performs a connection operation with AP3, and after STA2 is successfully connected with AP3, disconnects STA1 from AP1, and the specific procedure is exemplified as follows. In other embodiments, after the STA2 and the AP3 are successfully connected, if the non-AP MLD1 has two logical entities STA1 and STA3 connected to two logical access points AP1 and AP4 of the AP MLD1, the connection between STA1 and AP1 and the connection between STA3 and AP4 are disconnected. The scenario of multiple logical entities and so forth is not described in detail herein.

Sta2 sends an authentication request to AP3 and performs key exchange.

STA2 sends Association request frames or Reassociation request frames to AP3, which contain the address of STA2 or/and the address of non-AP MLD 1.

Ap3 post-accept sends Association response frames or Reassociation response frames to STA2 indicating an accept connection request.

After sta2 receives the connection response frame, if it indicates that the connection request is accepted, it starts exchanging data with AP3 and indicates that the higher-layer management entity of non-AP MLD1 has connected to AP3 and that the current process type is either Transition or ML Transition.

The upper management entity of the non-AP MLD1 instructs STA1 to send a disconnection request frame to AP1.

After sta1 receives the AP1 disconnection response frame, no more data is exchanged with AP1.

STA1 decrypts the received data packet by using the original key, and sends the decrypted data packet to a non-AP MLD1 data packet repetition checking module.

Sta2 decrypts the received data packet from AP3 using the new key, and sends the decrypted data packet to the non-AP MLD1 data packet duplicate checking module.

And the non-AP MLD1 data packet repetition checking module deletes the data packet with repeated sequence numbers according to the decrypted data packet sequence numbers, reorders the processed data packet, and sends the data packet to a high-level management entity of the non-AP MLD1 after the integrity detection.

18. If AP3 is affiliated with the multi-link device AP MLD2, then STA2 may also send link reconfiguration request frames to AP3, setting the parameter Type to the newly added link in link reconfiguration request frames, requesting to connect STA1 to other logical access points of AP MLD2. In other embodiments, STA2 may request that multiple logical entities of non-AP MLD 1be connected to other logical access points of AP MLD2.

In another embodiment, the link reconfiguration request frame in step 4 of the above embodiment does not include the parameter Cause, and does not include step 7 and step 8, and in step 11, after the AP3 sends the connection response frame, the DS-STA-NOTIFY primitive is sent to the server, where the parameters included therein are shown in table 11.

TABLE 11

Parameters (parameters)	Value of	Description of the invention
			STA address	Address of STA2 or address of non-AP MLD1	Address of terminal
UpdateType	Add	Type of operation requested

After receiving the DS-STA-NOTIFY primitive, the server modifies the information, for example, table 12 or table 13, and simultaneously transmits data to be transmitted to the non-AP MLD1 to the AP MLD1 and the AP3, or the AP MLD1 and the AP MLD2, according to the updated information.

Table 12

STA	AP
		Address of non-AP MLD1	Address of AP MLD1
Address of STA2	Address of AP3

TABLE 13

The embodiment of the invention also provides a device for switching the multi-link terminal equipment, which comprises:

Optionally, the second logic entity module is further configured to send a link reconfiguration request signaling to the target access point through the second logic entity if the target access point belongs to the multi-link device, set a parameter Type to be a newly added link in the request signaling, and request to connect the logic entity to other access points of the multi-link device.

Optionally, the first logic entity module is further configured to scan surrounding access points through a logic entity, and select a target access point from the scanned access points when the wireless link changes.

Optionally, the first access point module is further configured to, if the parameter Type in the link reconfiguration request signaling indicates that the link is requested to be deleted, search, by the logical access point, information corresponding to the value of the STA address in a logical entity of the access device corresponding to the value of the AP address according to the information in the parameter link element, and delete the information.

Optionally, if the link reconfiguration request signaling includes a parameter Cause, the first access point module is further configured to check, by the logical access point, a value of the parameter Cause when the parameter Type in the link reconfiguration request signaling indicates that the link is deleted, if the parameter Cause indicates that the Cause of the current reconfiguration request is handover or multi-link handover, read a parameter Target BSS in Extension element, and send a DS-MAP-NOTIFY primitive to the server, where the parameter Target BSS is set as an address of a Target access point or an address of a multi-link device to which the Target access point belongs, and the DS-MAP-NOTIFY primitive includes a parameter STA address, an AP address, and an Update Type, where the parameter STA address is used to indicate an address of the terminal, the AP address is used to indicate an address of the access point, and the Update Type is used to indicate a Type of operation requested.

The embodiment of the invention also provides equipment, which comprises a processor and a memory, wherein at least one instruction, at least one section of program code, a code set or an instruction set is stored in the memory, and the at least one instruction, the at least one section of program code, the code set or the instruction set is loaded and executed by the processor so as to realize the method for switching the multi-link terminal equipment related to the embodiment.

The embodiment of the invention also provides a computer readable storage medium, wherein at least one instruction, at least one section of program code, a code set or an instruction set is stored in the readable storage medium, and the at least one instruction, the at least one section of program code, the code set or the instruction set is loaded and executed by a processor, so as to realize the method for switching the multi-link terminal equipment related to the embodiment.

It should be understood that, in various embodiments of the present invention, the sequence number of each process described above does not mean that the execution sequence of some or all of the steps may be executed in parallel or executed sequentially, and the execution sequence of each process should be determined by its functions and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present invention.

Those of ordinary skill in the art will appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the solution. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.

It will be clear to those skilled in the art that, for convenience and brevity of description, specific working procedures of the above-described systems, apparatuses and units may refer to corresponding procedures in the foregoing method embodiments, and are not repeated herein.

In the several embodiments provided by the present invention, it should be understood that the disclosed systems, devices, and methods may be implemented in other manners. For example, the apparatus embodiments described above are merely illustrative, e.g., the division of the units is merely a logical function division, and there may be additional divisions when actually implemented, e.g., multiple units or components may be combined or integrated into another system, or some features may be omitted or not performed.

The units described as separate units may or may not be physically separate, and units shown as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

In addition, each functional unit in the embodiments of the present invention may be integrated in one processing unit, or each unit may exist alone physically, or two or more units may be integrated in one unit.

The functions, if implemented in the form of software functional units and sold or used as a stand-alone product, may be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention may be embodied essentially or in a part contributing to the prior art or in the form of a software product stored in a storage medium, comprising several instructions for causing a computer device (which may be a personal computer, a server, a network device or a terminal device, etc.) to perform all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: u disk, removable hard disk, ROM, RAM) disk or optical disk, etc.

The terminology used in the embodiments of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used in this application and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It should also be understood that the term "and/or" as used herein refers to and encompasses any or all possible combinations of one or more of the associated listed items. The character "/" herein generally indicates that the associated object is an "or" relationship.

The word "if" or "if" as used herein may be interpreted as "at … …" or "at … …" or "in response to a determination" or "in response to detection", depending on the context. Similarly, the phrase "if determined" or "if detected (stated condition or event)" may be interpreted as "when determined" or "in response to determination" or "when detected (stated condition or event)" or "in response to detection (stated condition or event), depending on the context.

The foregoing is merely illustrative of the present invention, and the present invention is not limited thereto, and any person skilled in the art will readily recognize that variations or substitutions are within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1.A method for switching a multi-link terminal device, which is applied to the multi-link terminal device, wherein the multi-link terminal device comprises a high-level management entity and at least two logic entities, and the at least two logic entities comprise a first logic entity and a second logic entity, and the method is characterized by comprising the following steps:

2. The method according to claim 1, wherein the link reconfiguration response signaling includes parameters of Action type, status code and Dialog token, the parameter of Action type is used for indicating the type of the current process, the Status code is used for indicating whether to accept the request, and the Dialog token is used for identifying the current process.

3. A method for handover of a multi-link terminal device according to claim 1, wherein the link reconfiguration request signaling further comprises a parameter Cause, the parameter Cause being used to indicate the Cause of the current reconfiguration request.

4. The method for switching a multi-link terminal device according to claim 1, wherein the link element includes parameters STA address and AP address, the parameter STA address is used for indicating an address of a terminal, is set as an address of a logical entity of the terminal device on the link, the AP address is used for indicating an address of an access point, and is set as an address of a logical entity of the access device on the link.

5. The method for switching a multi-link terminal device according to claim 1, wherein the Extension element includes a parameter Target BSS, and the parameter Target BSS is set to an address of a Target access point or an address of a multi-link device to which the Target access point belongs.

6. A method of multi-link terminal device handover according to any of claims 1-5, wherein the method further comprises:

if the target access point belongs to the multilink device, the logic entity II sends a link reconfiguration request signaling to the target access point, and the parameter Type is set as a newly added link in the request signaling to request the logic entity to be connected to the logic access point II of the multilink device.

7. A method of handover of a multi-link terminal device according to any of claims 1-5, further comprising, prior to the logical entity one sending a link reconfiguration request signalling to the logical access point one of the access devices:

the logic entity scans surrounding access points, and when the wireless link changes, selects a target access point from the scanned access points.

8. A method of multi-link terminal device handover according to any of claims 1-5, wherein the method further comprises:

the first logic entity decrypts the data packet received from the first logic access point by using the first key, and sends the decrypted data packet to the data packet repetition checking module of the multi-link terminal equipment;

the second logic entity decrypts the data packet received from the target access point by using the second key, and sends the decrypted data packet to the data packet repetition checking module of the multi-link terminal equipment;

and the multi-link terminal equipment data packet repetition checking module deletes the data packet with repeated sequence numbers according to the decrypted data packet sequence numbers, reorders the processed data packet, and sends the data packet to a Gao Cengguan entity after integrity detection.

9. A method for handover of a multi-link terminal device, the method comprising:

the logic access point sends a link reconfiguration response signaling to the logic entity I, and the logic entity I is used for notifying a high-level management entity of the multi-link terminal equipment that the access equipment receives a link reconfiguration request, and the high-level management entity instructs the logic entity II of the multi-link terminal equipment to execute a switching preparation operation and receives a notification that the logic entity II is connected to a target access point;

the logic access point I receives the disconnection request frame sent by the logic entity I and executes the disconnection operation with the logic entity I.

10. The method according to claim 9, wherein the link reconfiguration response signaling includes parameters of Action type, status code and Dialog token, the parameter of Action type is used for indicating the type of the current process, the Status code is used for indicating whether to accept the request, and the Dialog token is used for identifying the current process.

11. The method for switching a multi-link terminal device according to claim 9, wherein the link element includes parameters STA address and AP address, the parameter STA address is used for indicating an address of a terminal, is set as an address of a logical entity of the terminal device on the link, the AP address is used for indicating an address of an access point, and is set as an address of a logical entity of the access device on the link.

12. The method for handover of a multi-link terminal device according to claim 11, wherein the performing according to parameters in the link reconfiguration request signaling comprises:

if the parameter Type in the link reconfiguration request signaling indicates that the link is requested to be deleted, the logic access point searches information corresponding to the value of the STA address in a logic entity of the access device corresponding to the value of the AP address according to the information in the parameter link element, and deletes the information.

13. A method of handover of a multi-link terminal device according to any of claims 9-12, characterized in that the link reconfiguration request signalling further comprises a parameter Cause, which is used to indicate the Cause of the current reconfiguration request.

14. The method for handover of a multi-link terminal device according to claim 13, further comprising:

when the parameter Type in the link reconfiguration request signaling indicates to delete the link, the logic access point checks the value of the parameter Cause, if the parameter Cause indicates that the reason of the current reconfiguration request is switching or multi-link switching, the logic access point reads a parameter Target BSS in Extension element, sends a DS-MAP-NOTIFY primitive to the server, the parameter Target BSS is set as the address of the Target access point or the address of the multi-link device to which the Target access point belongs, the DS-MAP-NOTIFY primitive contains parameters STA address, AP address and Update Type, the parameter STA address is used for indicating the address of the terminal, the AP address is used for indicating the address of the access point, and the Update Type is used for indicating the operation Type of the request.

15. The method for switching a multi-link terminal device according to claim 14, wherein Update Type is set to be increased, when a target access point belongs to a single-link device, a parameter STA address in the DS-MAP-NOTIFY primitive is set to be an address of a logical entity two of the multi-link terminal device, and AP address is set to be an address of the target access point; when the target access point belongs to the multi-link device, the parameter STA address in the DS-MAP-NOTIFY primitive is set as the address of the multi-link terminal device, and the AP address is set as the address of the multi-link device to which the target access point belongs.

16. A method of multi-link terminal device handover according to any of claims 9-12, further comprising:

after sending a connection response frame to a second logic entity of the multi-link terminal device, the target access point sends a DS-STA-NOTIFY primitive to the server, wherein the DS-STA-NOTIFY primitive comprises parameters of STA address and Update Type, the parameter of STA address is used for indicating an address of the terminal, and the Update Type is used for indicating a requested operation Type.

17. The method for switching a multi-link terminal device according to claim 16, wherein Update Type is set to be increased, and when a target access point belongs to a single-link device, a parameter STA address in the DS-STA-NOTIFY primitive is set to be an address of a logical entity two of the multi-link terminal device; when the target access point belongs to the multi-link device, the parameter STA address in the DS-STA-NOTIFY primitive is set as the address of the multi-link terminal device.

18. An apparatus for switching a multi-link terminal device, the apparatus comprising:

19. An apparatus for switching a multi-link terminal device, the apparatus comprising:

the first access point module is further configured to send a link reconfiguration response signaling to the first logic entity through the logic access point, where the first logic entity is configured to notify a higher-layer management entity of the multi-link terminal device that the access device accepts a link reconfiguration request, and the higher-layer management entity instructs the second logic entity of the multi-link terminal device to perform a handover preparation operation and receive a notification that the second logic entity is connected to the target access point;

the first access point module is further configured to perform an operation of disconnecting from the first logical entity by receiving, by the first logical access point, a disconnection request frame sent by the first logical entity.

20. An apparatus comprising a processor and a memory having stored therein at least one instruction, at least one piece of program code, a set of codes, or a set of instructions, the at least one instruction, at least one piece of program code, a set of codes, or a set of instructions loaded and executed by the processor to implement the method of multi-link terminal device handoff as claimed in any one of claims 1-8, or to implement the method of multi-link terminal device handoff as claimed in any one of claims 9-17.

21. A computer readable storage medium having stored therein at least one instruction, at least one piece of program code, code set, or instruction set, loaded and executed by a processor, to implement the method of multi-link terminal device handover according to any of claims 1-8, or to implement the method of multi-link terminal device handover according to any of claims 9-17.

22. A wireless transmission system, characterized in that it comprises a multi-link terminal device and an access device, the multi-link terminal device being configured to implement the method of multi-link terminal device handover according to any of claims 1-8; the access device is configured to implement a method for handover of a multi-link terminal device according to any of claims 9-17.