A method and apparatus for real wireless roaming

Abstract

The application provides a method and device for realizing wireless roaming, and relates to the technical field of wireless communication roaming, which comprises the following steps: S1, detecting and obtaining roaming information of each wireless terminal connected to an access point (AP); the roaming information comprises 802.11kvr roaming information of the wireless terminal; S2, determining the device type of each wireless terminal and the roaming attribute supported by the device type of each wireless terminal according to the 802.11kvr roaming information of each wireless terminal; S3, creating a standby access point (AP) according to the device type of each wireless terminal, wherein the standby AP has the same configuration and service as the original AP, determining the roaming attribute supported by the standby AP according to the device type of each wireless terminal, and selecting whether to start the roaming function of the standby AP, wherein the roaming function comprises 802.11kvr roaming function; S4, switching to use the original AP or the standby AP during the roaming process of the wireless terminal according to the device type of each wireless terminal.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of wireless communication roaming, and more particularly, to a method and device for realizing wireless roaming. BACKGROUND

[0002] With the rapid development of wireless network communication technology, the wide application of network terminal devices and the development of mobile Internet of Things, users' demand for network communication environment is also increasing. In terms of wireless communication network, taking IEEE 802.11 wireless network protocol as a standard, it has developed from WiFi4, WiFi5 to WiFi6 (WIFi4, fourth generation WiFi technology, that is, 802.11n; WiFi5, fifth generation WiFi technology, that is, 802.11ac; WiFi6, sixth generation WiFi technology, that is, 802.11ax). The latest WiFi6 technology supports 1024QAM (Quadrature Amplitude Modulation), OFDMA (Orthogonal Frequency Division Multiplexing), MU-MiMO (Multi-User Multiple-Input Multiple-Output), spatial division multiplexing, and extended coverage, and a series of new technologies, which brings IEEE 802.11 wireless network technology to a new height, better service communication quality, higher bandwidth, and high-width coverage.

[0003] However, in the WiFi coverage scene, such as wireless network home coverage, campus wireless network coverage, shopping mall wireless network coverage, etc., wireless network still faces the problem of WiFi wireless roaming. Wireless roaming is the process of switching the access point AP of the terminal user from one to another in the same BSS (Basic Service Set) WiFi coverage scene, in combination with RSSI (Received Signal Strength Indicator), channel interference, wireless power, and load balancing during the movement of the terminal user. The basic process of wireless roaming is to disconnect (the current access point), re-authenticate, and reconnect (another access point). The switching of the access point AP is accompanied by network packet delay, and even packet loss.

[0004] The common solution for optimizing the roaming of a wireless network, reducing network packet delay and packet loss during access point (AP) switching, is to adjust the roaming switching according to RSSI and channel status, but it still cannot cope with complex and changeable wireless network environment, and network packet delay, packet loss and network disconnection still occur, affecting the experience of terminal users. SUMMARY

[0005] In order to overcome the deficiencies of the prior art, the present application provides a method and device for realizing wireless roaming.

[0006] The technical scheme adopted by the present application to solve the technical problems is: a method for realizing wireless roaming, which is improved in that it comprises the following steps: S1, detecting and obtaining roaming information of each wireless terminal connected to an access point (AP); the roaming information comprises 802.11kvr roaming information of the wireless terminal; S2, determining the device type of each wireless terminal and the roaming attribute supported by the device type of each wireless terminal according to the 802.11kvr roaming information of each wireless terminal connected to the AP; S3, creating a standby AP according to the device type of each wireless terminal, the standby AP having the same configuration and service as the original AP, determining the roaming attribute supported by the standby AP according to the device type of each wireless terminal, and selecting whether to start the roaming function of the standby AP, the roaming function including the 802.11kvr roaming function; S4, switching between using the original AP and the standby AP during the roaming process of each wireless terminal according to the device type of each wireless terminal.

[0007] In the above method, in the step S1 of detecting and obtaining the roaming information of each wireless terminal connected to the AP, the following steps are included:

[0008] S101, extracting roaming-related segment information in a message by detecting and obtaining the message information in the wireless network;

[0009] S102, detecting the response message information of each wireless terminal by actively sending a request message for detecting the roaming-related segment information, and obtaining the roaming information of each wireless terminal.

[0010] In the above method, the message information in the step S101 at least includes:

[0011] a Beacon frame wireless message in the 802.11 protocol;

[0012] a probe frame wireless message in the 802.11 protocol;

[0013] a wireless message related to roaming actively initiated by each wireless terminal.

[0014] In the method, in the step S101, the message information in the wireless network is acquired,

[0015] For the wireless resource management protocol 802.11k, the acquired message information at least includes: the Neighbor Report wireless message information, the Beacon Report wireless message information and the APChannel Report wireless message information;

[0016] For the wireless network management protocol 802.11v, the acquired message information at least includes the BSS Transition wireless message information;

[0017] For the fast roaming connection protocol 802.11r, the acquired message information at least includes the Fast BSS Transition wireless message information, the Fast BSS Transition over DS wireless message information and the Fast BSS Transition over Air wireless message information.

[0018] In the method, in the step S102, a request message for detecting the roaming related segment information is actively sent,

[0019] For the wireless resource management protocol 802.11k, the corresponding request message includes the wireless information measurement request wireless message;

[0020] For the wireless network management protocol 802.11v, the corresponding request message includes the BTM request wireless message, the BTM being the BSS transition management protocol;

[0021] For the fast roaming connection protocol 802.11r, the corresponding request message includes the FT request wireless message, the FT being the Fast BSS Transition protocol.

[0022] In the method, in the step S2, the device type of each wireless terminal is determined, and the roaming attribute supported by the device type of the wireless terminal includes the following steps:

[0023] The device type D of the wireless terminal is determined sum ={D,D k ,D v ,D r ,D kv ,D kr ,D vr ,D kvr},D sumD represents the sum of all the device types of the wireless terminals n D represents the device type of a single wireless terminal, the subscript represents n = {k, v, r}, wherein k represents that the wireless terminal is equipped with the wireless resource management protocol 802.11k, v represents that the wireless terminal is equipped with the wireless network management protocol 802.11v, and r represents that the wireless terminal is equipped with the fast roaming connection protocol 802.11r;

[0024] Let m represent the number of attributes of n, and 0≤m≤3, when m=0, that is, the wireless terminal type represented by D does not support any wireless roaming function, when m=1, that is, D={D k ,D v ,D r} represents that the wireless terminal type supports one wireless roaming attribute, when m=2, that is, D={D kv ,D kr ,D vr} represents that the wireless terminal type supports two wireless roaming attributes, and when m=3, that is, D kvr represents that the wireless terminal type supports all roaming attributes.

[0025] In the above method, in the step S3, the roaming attributes supported by the standby access point AP are determined according to the device type of each wireless terminal, comprising the following steps:

[0026] AP sum ={AP,AP k ,AP v ,AP r ,AP kv ,AP kr ,AP vr ,AP kvr}

[0027] AP sum represents the sum of the number of all standby APs with different roaming attributes, AP n represents a standby access point AP, the subscript represents n = {k, v, r} roaming attributes possessed by the standby access point AP, wherein k represents that the standby access point AP is equipped with the wireless resource management protocol 802.11k, v represents that the standby access point AP is equipped with the wireless network management protocol 802.11v, and r represents that the standby access point AP is equipped with the fast roaming connection protocol 802.11r;

[0028] Let m represent the number of attributes of n, and 0≤m≤3, when m=0, that is, the standby access point AP represented by AP does not support any wireless roaming function, when m=1, that is, AP={AP k ,AP v ,AP rThe backup access point (AP) represented by} supports a wireless roaming attribute. When m = 2, that is, AP = {AP} kv AP kr AP vr The backup access point (AP) represented by} supports two wireless roaming attributes simultaneously. When m=3, that is, AP kvr The indicated backup access point (AP) supports all roaming attributes.

[0029] In the above method, step S4, switching to the backup access point (AP) during wireless terminal roaming, includes the following steps:

[0030] Based on the identified device type Dn of each wireless terminal, roaming handover is performed using the corresponding backup access point APn.

[0031] The present invention also provides a device for real-world wireless roaming, including a detection module, a determination module, a creation module, and a switching module.

[0032] The detection module is used to detect and acquire roaming information of each wireless terminal connected to the access point (AP); the roaming information includes the 802.11kvr roaming information of the wireless terminal.

[0033] The determination module is connected to the detection module and is used to determine the device type of each wireless terminal and the roaming attributes supported by each wireless terminal type based on the 802.11kvr roaming information of each wireless terminal of the access point AP.

[0034] The creation module is connected to the determination module and is used to create a backup access point AP based on the device type of each wireless terminal. The backup access point AP has the same configuration and services as the original access point AP. Based on the device type of each wireless terminal, the roaming attributes supported by the backup access point AP are determined, and whether to enable the roaming function of the backup access point AP is selected. The roaming function includes 802.11kvr roaming function.

[0035] The switching module is connected to the creation module and is used to switch between the original access point (AP) and the backup access point (AP) during wireless terminal roaming, depending on the device type of each wireless terminal.

[0036] The beneficial effects of this invention are: when a mobile terminal is roaming, the roaming access point (AP) can be dynamically selected based on the network service environment and the operating status of the wireless terminal, thereby minimizing latency and packet loss and improving the user experience of the terminal. Attached Figure Description

[0037] Appendix Figure 1 This is a flowchart illustrating a practical wireless roaming method according to the present invention.

[0038] AppendixFigure 2 and attached Figure 3 This is a schematic diagram of a wireless mobile terminal's movement trajectory roaming model. Detailed Implementation

[0039] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0040] The following will clearly and completely describe the concept, specific structure, and technical effects of the present invention in conjunction with embodiments and accompanying drawings, so as to fully understand the purpose, features, and effects of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, not all of them. Other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are all within the scope of protection of the present invention. Furthermore, all connections / linkages involved in the patent do not simply refer to direct contact between components, but rather to the ability to form a better connection structure by adding or reducing connecting accessories according to specific implementation conditions. The various technical features in this invention can be combined interactively without contradicting each other.

[0041] Optimization of wireless roaming can also be based on the standard 802.11kVR wireless roaming protocol. This protocol optimizes roaming before and during the roaming process. Before roaming, it performs scanning and sharing of surrounding signals and access points; during roaming, it performs wireless network authentication and connection. However, the variety of wireless mobile terminals means that not all devices accessing the wireless network support the wireless roaming protocol. Therefore, when a mobile terminal needs to roam during movement, data packet delays and packet loss can still occur, potentially leading to network outages and a poor user experience. Based on this situation, refer to... Figure 1 , Figure 2 and Figure 3 As shown, the present invention provides a method for real-world wireless roaming, comprising the following steps S1-44:

[0042] S1. Detect and acquire roaming information of each wireless terminal connected to the access point (AP); the roaming information includes 802.11kvr roaming information of the wireless terminals; the 802.11kvr roaming information includes: Radio Resource Management Protocol 802.11k, used to provide services for channel selection, transmission power control and wireless roaming of the wireless network; Radio Network Management Protocol 802.11v, used to provide enhanced services for bandwidth and load balancing of the wireless network; (wherein BTM Roaming Transition Management Protocol, BSS Transition Management); Fast Roaming Connection Protocol 802.11r, used to provide fast roaming services (wherein FT Fast Basic Service Set Transition Protocol);

[0043] The detecting and obtaining the roaming information of each wireless terminal connected to the access point AP comprises the following steps:

[0044] S101, extracting the roaming related segment information in the message by detecting and obtaining the message information in the wireless network; the message information at least comprises the Beacon frame wireless message in the 802.11 protocol, the probe frame wireless message in the 802.11 protocol and the wireless message of the roaming related wireless terminal initiated actively;

[0045] The message information in the wireless network is obtained, and for the wireless resource management protocol 802.11k, the corresponding obtained message information at least comprises the Neighbor Report wireless message information, the Beacon Report wireless message information and the AP Channel Report wireless message information; for the wireless network management protocol 802.11v, the corresponding obtained message information at least comprises the BSS Transition wireless message information; for the fast roaming connection protocol 802.11r, the corresponding obtained message information at least comprises the Fast BSS Transition wireless message information, the Fast BSS Transition over DS wireless message information and the Fast BSS Transition over Air wireless message information;

[0046] S102, detecting the response message information of each wireless terminal by actively sending the request message of detecting the roaming related segment information, and obtaining the roaming information of each wireless terminal;

[0047] The request message of detecting the roaming related segment information is actively sent, and for the wireless resource management protocol 802.11k, the corresponding request message comprises the wireless information measurement request (Beacon frame) wireless message; for the wireless network management protocol 802.11v, the corresponding request message comprises the BTM request wireless message, the BTM being the BSS transition management protocol; for the fast roaming connection protocol 802.11r, the corresponding request message comprises the FT request wireless message, the FT being the Fast BSS Transition protocol.

[0048] S2, determining the device type of each wireless terminal and the roaming attribute supported by the device type of each wireless terminal by a preset algorithm model according to the 802.11kvr roaming information of each wireless terminal of the access point AP;

[0049] The device type of each wireless terminal and the roaming attributes supported by that device type are determined using a pre-defined algorithm model, including the following steps:

[0050] Determine the device type D of the wireless terminal sum ={D,D k D v D r D kv D kr D vr D kvr}, D sum D represents the sum of all device types for all wireless terminals. n The device type of a single wireless terminal is indicated by the subscript n = {k, v, r}, where k indicates that the wireless terminal has the 802.11k wireless resource management protocol, v indicates that the wireless terminal has the 802.11v wireless network management protocol, and r indicates that the wireless terminal has the 802.11r fast roaming connection protocol.

[0051] Let m represent the number of attributes of n, and 0 ≤ m ≤ 3. When m = 0, the wireless terminal type represented by D does not support any wireless roaming function. When m = 1, D = {D} k D v D r The wireless terminal type represented by} supports a wireless roaming attribute. When m = 2, that is, D = {D} kv D kr D vr The wireless terminal type represented by} supports two wireless roaming attributes simultaneously. When m = 3, that is, D kvr The indicated wireless terminal type supports all roaming attributes.

[0052] S3. Based on the determined device types of each wireless terminal, create a backup access point AP. The backup access point AP has the same configuration and services as the original access point AP, including at least SSID, channel, and bandwidth. Based on the device types of each wireless terminal, determine the roaming attributes supported by the backup access point AP and select whether to enable the roaming function of the backup access point AP. The roaming function includes 802.11kvr roaming.

[0053] Based on the device type of each wireless terminal, determine the roaming attributes supported by the backup access point (AP), including the following steps:

[0054] AP sum ={AP,AP k AP v AP r AP kv AP kr APvr ,AP kvr}

[0055] AP sum represents the total number of all the backup APs with different roaming attributes, AP n represents the backup access point AP, and the subscript represents the roaming attributes possessed by the backup access point AP, wherein n = {k, v, r}, k represents that the backup access point AP possesses a wireless resource management protocol 802.11k, v represents that the backup access point AP possesses a wireless network management protocol 802.11v, and r represents that the backup access point AP possesses a fast roaming connection protocol 802.11r;

[0056] m represents the number of attributes of n, and 0≤m≤3, when m = 0, that is, AP represents the backup access point AP which does not support any wireless roaming function, when m = 1, that is, AP = {AP k ,AP v ,AP r} represents the backup access point AP which supports one wireless roaming attribute, when m = 2, that is, AP = {AP kv ,AP kr ,AP vr} represents the backup access point AP which supports two wireless roaming attributes, and when m = 3, that is, AP kvr represents the backup access point AP which supports all the roaming attributes.

[0057] S4, switching the original access point AP or the backup access point AP in the roaming process of the wireless terminal according to the device type of each wireless terminal; the backup access point AP is switched in the roaming process of the wireless terminal, and the roaming switching is realized by using the backup access point AP corresponding to the device type Dn of each wireless terminal which has been determined. In this way, when the mobile terminal roams, the roaming access point AP can be dynamically selected according to the network service environment and the running state of the wireless terminal, the network packet delay and packet loss during the switching of the access point AP are reduced to the greatest extent, and the user experience of the terminal is improved.

[0058] The application further provides a device for realizing wireless roaming, which comprises a detection module, a determination module, a creation module and a switching module,

[0059] The detection module is used for detecting and acquiring roaming information of each wireless terminal connected to the access point AP; the roaming information comprises 802.11kvr roaming information of the wireless terminal.

[0060] The determination module is connected with the detection module and is used for determining the device type of each wireless terminal and the roaming attribute supported by the device type of each wireless terminal according to the 802.11kvr roaming information of each wireless terminal of the access point AP.

[0061] The creating module is connected with the determining module, and is used for creating a backup access point (AP) according to the device type of each wireless terminal, the backup access point (AP) having the same configuration and service as the original access point (AP), determining the roaming attribute supported by the backup access point (AP) according to the device type of each wireless terminal, and selecting whether to start the roaming function of the backup access point (AP), the roaming function including the 802.11k vr roaming function;

[0062] The switching module is connected with the creating module, and is used for switching the original access point (AP) or the backup access point (AP) during the roaming of the wireless terminal according to the device type of each wireless terminal.

[0063] The method and device for realizing wireless roaming provided by the application can dynamically select a roaming access point (AP) according to the network service environment and the running state of the wireless terminal when the mobile terminal roams, and can maximize the reduction of delay and packet loss, and improve the user experience of the terminal.

[0064] The above is a specific description of the preferred embodiment of the application, but the application is not limited to the above-mentioned embodiment, and those skilled in the art can make various equivalent modifications or replacements without departing from the spirit of the application, and these equivalent modifications or replacements are all included in the scope defined by the claims of the application.

Claims

1. A method for real-time wireless roaming, characterized by: The steps include the following: S1, detecting and obtaining the roaming information of each wireless terminal connected to the access point AP; the roaming information includes 802.11kvr roaming information of the wireless terminal; the 802.11kvr roaming information includes: a wireless resource management protocol 802.11k, a wireless network management protocol 802.11v, and a fast roaming connection protocol 802.11r; In step S1, the roaming information of each wireless terminal connected to the access point AP is detected and obtained, including the following steps: S101, extracting the roaming-related segment information in the message by detecting and obtaining the message information in the wireless network; S102, detecting the response message information of each wireless terminal by actively sending a request message for detecting the roaming-related segment information, and obtaining the roaming information of each wireless terminal; The message information in step S101 at least includes: Beacon frame wireless message in 802.11 protocol; Probe frame wireless message in 802.11 protocol; Wireless message related to roaming initiated by each wireless terminal; In step S101, the message information in the wireless network is obtained, For the wireless resource management protocol 802.11k, the corresponding obtained message information at least includes: neighbor report Neighbor Report wireless message information, beacon frame report Beacon Report wireless message information, and channel report APChannel Report wireless message information; For the wireless network management protocol 802.11v, the corresponding obtained message information at least includes: BSS transition wireless message information; For the fast roaming connection protocol 802.11r, the corresponding obtained message information at least includes: Fast BSS Transition wireless message information, Fast BSS Transition over DS wireless message information, and Fast BSS Transition over Air wireless message information; In step S102, the request message for detecting the roaming-related segment information is actively sent, For the wireless resource management protocol 802.11k, the corresponding request message includes: wireless information measurement request wireless message; For the wireless network management protocol 802.11v, the corresponding request message includes: BTM request wireless message, BTM being BSS transition management protocol; For the fast roaming connection protocol 802.11r, the corresponding request message includes: FT request wireless message, FT being Fast BSS Transition protocol; S2, determining the device type of each wireless terminal according to the 802.11kvr roaming information of each wireless terminal of the access point AP, and the roaming attribute supported by the device type of each wireless terminal; S3, creating a backup access point AP according to the device type of each wireless terminal, the backup access point AP having the same configuration and service as the original access point AP, determining the roaming attributes supported by the backup access point AP according to the device type of each wireless terminal, and selecting whether to start the roaming function of the backup access point AP, the roaming function including the 802.11kvr roaming function; S4, switching between the original access point AP and the backup access point AP during the roaming of the wireless terminal according to the device type of each wireless terminal.

2. A method for real wireless roaming as claimed in claim 1, wherein: In step S2, the device type of each wireless terminal is determined, and the roaming attributes supported by the device type of the wireless terminal include the following steps: Determine the device type D of the wireless terminal sum ={D,D k D v D r D kv D kr D vr D kvr }, D sum D represents the sum of all device types for all wireless terminals. n The device type of a single wireless terminal is indicated by the subscript n = {k, v, r}, where k indicates that the wireless terminal has the 802.11k wireless resource management protocol, v indicates that the wireless terminal has the 802.11v wireless network management protocol, and r indicates that the wireless terminal has the 802.11r fast roaming connection protocol. Let m denote the number of attributes of n, and 0≤m≤3, when m=0, i.e. D represents a wireless terminal type that does not support any wireless roaming functionality, when m=l, i.e. D={D k ,D v ,D r} represents a wireless terminal type that supports one wireless roaming attribute, when m=2, i.e. D={D kv ,D kr ,D vr} represents a wireless terminal type that supports two wireless roaming attributes, and when m=3, i.e. D={D kvr represents a wireless terminal type that supports all roaming attributes.

3. A method for real wireless roaming as claimed in claim 2, wherein: In step S3, the roaming attributes supported by the backup access point AP are determined according to the device type of each wireless terminal, including the following steps: AP sum = { AP, AP k , AP v , AP r , AP kv , AP kr , AP vr , AP kvr} AP sum represents the total number of all the backup APs with different roaming attributes, AP n represents the backup access point AP, the subscript represents the roaming attributes possessed by the n={k, v, r} backup access point AP, wherein k represents that the backup access point AP possesses the wireless resource management protocol 802.11k, v represents that the backup access point AP possesses the wireless network management protocol 802.11v, and r represents that the backup access point AP possesses the fast roaming connection protocol 802.11r; Let m denote the number of attributes of n, and 0≤m≤3, when m=0, i.e. AP denotes a backup access point AP which does not support any wireless roaming function, when m=1, i.e. AP={AP k ,AP v ,AP r} denotes a backup access point AP which supports one wireless roaming attribute, when m=2, i.e. AP={AP kv ,AP kr ,AP vr} denotes a backup access point AP which supports two wireless roaming attributes, and when m=3, i.e. AP kvr denotes a backup access point AP which supports all roaming attributes.

4. A method for real wireless roaming as claimed in claim 3, wherein: In step S4, the backup access point AP is switched during the roaming of the wireless terminal, including the following steps: According to the device type Dn of each wireless terminal that has been determined, the corresponding backup access point APn is used for roaming switching.

5. An apparatus for realizing wireless roaming, characterized by comprising: The system includes a detection module, a determination module, a creation module, and a switching module, The detection module is used to detect and obtain roaming information of each wireless terminal connected to the access point AP; the roaming information includes 802.11kvr roaming information of the wireless terminal; the 802.11kvr roaming information includes: a wireless resource management protocol 802.11k, a wireless network management protocol 802.11v, and a fast roaming connection protocol 802.11r; The detection module detects and obtains roaming information of each wireless terminal connected to the access point AP, including: By detecting and obtaining message information in the wireless network, the roaming-related segment information in the message is extracted; By actively sending a request message for detecting roaming-related segment information, the response message information of each wireless terminal is detected, and the roaming information of each wireless terminal is obtained; The message information at least includes: Beacon frame wireless message in the 802.11 protocol; Probe frame wireless message in the 802.11 protocol; Wireless message related to roaming initiated by each wireless terminal; For the wireless resource management protocol 802.11k, the corresponding obtained message information at least includes: neighbor report Neighbor Report wireless message information, beacon frame report Beacon Report wireless message information, and channel report AP Channel Report wireless message information; For the wireless network management protocol 802.11v, the corresponding obtained message information at least includes: BSS Transition wireless message information; For the fast roaming connection protocol 802.11r, the corresponding obtained message information at least includes: Fast BSS Transition wireless message information, Fast BSS Transition over DS wireless message information, and Fast BSS Transition over Air wireless message information; The detection module initiatively sends a request message for detecting the roaming related segment information, For the wireless resource management protocol 802.11k, the corresponding request message comprises a wireless information measurement request wireless message; For the wireless network management protocol 802.11v, the corresponding request message comprises a BTM request wireless message, BTM being a BSS transition management protocol; For the fast roaming connection protocol 802.11r, the corresponding request message comprises an FT request wireless message, FT being a fast BSS transition protocol; The determination module is connected with the detection module, and is configured to determine the device type of each wireless terminal and the roaming attribute supported by the device type of each wireless terminal according to the 802.11kvr roaming information of each wireless terminal of the access point AP; The creation module is connected with the determination module, and is configured to create a backup access point AP according to the device type of each wireless terminal, the backup access point AP having the same configuration and service as the original access point AP, determine the roaming attribute supported by the backup access point AP according to the device type of each wireless terminal, and select whether to start the roaming function of the backup access point AP, the roaming function comprising the 802.11kvr roaming function; The switching module is connected with the creation module, and is configured to switch between using the original access point AP and the backup access point AP during the roaming process of each wireless terminal according to the device type of each wireless terminal.

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