WO2011110125A2

WO2011110125A2 - Method and access point for changing communication link

Info

Publication number: WO2011110125A2
Application number: PCT/CN2011/073185
Authority: WO
Inventors: 罗璟真
Original assignee: 华为技术有限公司
Priority date: 2011-04-22
Filing date: 2011-04-22
Publication date: 2011-09-15
Also published as: CN102845107A; WO2011110125A3

Abstract

The present invention provides a method and an access point for changing the communication link. The method includes that when the preset condition is met, the second Universal Mobile Telecommunication System Access Point (UAP), which operates normally, receives the message for starting forwarding and starts the forwarding function of the second UAP according to the message for starting forwarding, so as to become the host UAP of the first UAP (101); the second UAP forwards the communication messages between the first UAP and a network side (102). The access point includes a start module and a communication module. By the solution of the present invention, the purposes of cost savings and easy maintenance are effectively achieved.

Description

Method and access point for changing communication links

Technical field

Embodiments of the present invention relate to communication technologies, and in particular, to a method and an access point for changing a communication link. Background technique

Universal Mobile Telecommunications System (UMTS) Access Point (UMTS Access Point, UAP for short) is a new access point product. It provides users with standard UMTS services and connects to the network side devices through Digital Subscriber Line (DSL)/Internet Protocol (IP) broadband. UAP can provide operators with a low-cost home/indoor coverage solution that can improve network coverage and capacity through user deployment. Especially in the current surge of data services, UAP can be used as an effective carrier for mobile broadband. Data services have no impact on the original network. And users can enjoy low rates and home networking applications. The emergence of UAP will make it possible to establish a home unified communications platform, and will truly achieve Fixed-Mobile Convergence (FMC).

In the prior art, UAP is generally connected to the network through an office LAN (Office LAN), in order to achieve wide coverage of a wideband code division multiple access (WCDMA) signal to an area, an office local area network There may be multiple UAPs underneath. A UAP in the same office LAN may not be able to connect to the security gateway (Security GateWay, SeGW for short) or the management system that cannot pass UAP due to some configuration parameter errors, software bugs, or hardware failures. (HNB Management System, abbreviated as: HMS) maintains it, or cannot establish a Flow Control Transmission Protocol (SCTP) link with the Access Gateway (AG). UAP offline problem. When the UAP is offline, it cannot provide access services for the user equipment (User Equipment, UE for short), which seriously affects the user experience. Moreover, the placement position of UAP is usually scattered, and may even be placed in a place that is not easily accessible. Once there is a problem that cannot be remotely maintained, UAP becomes an isolated point, and only engineers can be sent to the near-end maintenance, which is very costly. Summary of the invention

Embodiments of the present invention provide a method and an access point for changing a communication link, so that any access point in the network can change its own communication link when a preset condition is met, even if a UAP that fails with the network side is also It can still provide services for users, which not only reduces the maintenance cost of UAP, but also reduces the maintenance cost of the network, effectively achieving cost saving and maintenance.

In one aspect, an embodiment of the present invention provides a method for changing a communication link, including:

When the preset condition is met, the working second access point UAP receives the start forwarding information, and starts the forwarding function of the second UAP according to the start forwarding information to become the host UAP of the first UAP; the second UAP Forwarding the communication message of the first UAP and the network side.

On the other hand, the embodiment of the present invention further provides a method for changing a communication link, including: when a preset condition is met, the first access point UAP selects a second according to the previously obtained UAP information.

The UAP is a host UAP, and sends start forwarding information to the second UAP;

And forwarding, by the second UAP, the communication message of the first UAP and the network side.

In another aspect, an embodiment of the present invention further provides an access point, including:

a startup module, configured to receive start forwarding information, start forwarding according to the startup forwarding information, and become a host UAP of the first UAP;

And a communication module, configured to forward the communication message of the first UAP and the network side.

a selection module, configured to: when the preset condition is met, select a second UAP as a host UAP according to the previously obtained UAP information, and send start forwarding information to the second UAP;

And a communication module, configured to forward, by the second UAP, a communication message with the network side.

A method and an access point for changing a communication link according to an embodiment of the present invention, when a preset condition is met, The second UAP that works normally is used as the host UAP of the first UAP, and the host UAP forwards the communication packet between the first UAP and the network side, thereby effectively ensuring normal communication between the first UAP and the network side, and does not require near-end maintenance. , saving maintenance costs. DRAWINGS

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, a brief description of the drawings used in the embodiments or the prior art description will be briefly described below. Obviously, the drawings in the following description It is a certain embodiment of the present invention, and other drawings can be obtained from those skilled in the art without any creative work.

FIG. 1 is a flowchart of a method for changing a communication link according to an embodiment of the present invention;

2 is a flowchart of a method for changing a communication link according to still another embodiment of the present invention;

FIG. 3 is a schematic structural diagram of an access point according to an embodiment of the present invention;

FIG. 4 is a schematic structural diagram of an access point according to another embodiment of the present invention. detailed description

The technical solutions in the embodiments of the present invention are clearly and completely described in the following with reference to the accompanying drawings in the embodiments of the present invention. It is a partial embodiment of the invention, and not all of the embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative efforts are within the scope of the present invention.

FIG. 1 is a flowchart of a method for changing a communication link according to an embodiment of the present invention. As shown in FIG. 1, the method includes:

Step 101: When the preset condition is met, the second working UAP receives the start forwarding information, and starts the forwarding function of the second UAP according to the start forwarding information to become the host UAP of the first UAP. The first UAP is a generic The concept of a finger, that is, any UAP within the network (including but not limited to the same local area network, or within the wide area network) can be referred to as a first UAP. Second UAP For a working UAP (preferably but not limiting the second UAP to be in the same local area network as the first UAP), it is also a generalized concept, that is, other normal working UAPs other than the first UAP can be called Second UAP. The host UAP refers to a UAP that provides a forwarding function for the first UAP data. The preset conditions include a plurality of types, which may be, but are not limited to, the first UAP and the network side communication link are faulty, the remaining life cycle of the first UAP is less than or equal to a preset value, and the first UAP receives a command to change the communication link. Wait. The start forwarding information may be automatically sent by the HMS or manually triggered to the second UAP, or may be automatically sent by the first UAP to the second UAP, which is described in detail in the following embodiments.

Step 102: The second UAP forwards the communication packet of the first UAP and the network side.

The forwarding of the communication packet may include, but is not limited to, uplink forwarding and downlink forwarding. The uplink may be: when the second UAP receives the uplink packet sent by the first UAP, the second UAP packet is encapsulated by the first UAP and encapsulated by the first UAP. The subsequent message is forwarded to the network side. The encapsulation here may be to re-encapsulate the uplink message by using the tunnel intranet IP of the first UAP. The downlink forwarding may be: the second UAP receives the downlink packet sent by the network side, and after decrypting the downlink packet, determines whether the destination address is the intranet IP of the first UAP, and if yes, re-transmits the packet. After being encapsulated, it is forwarded to the first UAP.

The method for changing the communication link provided by the embodiment of the present invention, the host UAP forwards the uplink and downlink packets for the first UAP that meets the preset condition, thereby effectively ensuring that the first UAP can communicate with the network side through the host UAP, thereby serving as the UE. Provides access services without the need for near-end maintenance, saving costs.

FIG. 2 is a flowchart of a method for changing a communication link according to another embodiment of the present invention. The method shown in FIG. 2 is a specific implementation manner of the method shown in FIG. 1. As shown in Fig. 2, the method includes two parts: a preparation process and an implementation process. The preparation process and the implementation process are respectively introduced below.

The preparation process includes:

Step 201: UAP-A is powered on, detects other UAPs, and obtains transmission link state information of other normal working UAPs.

Among them, UAP-A can specifically refer to any UAP in the network, which is equivalent to the previous implementation. The first UAP mentioned in the example. Here, it is possible, but not limited to, to detect other UAPs by using the proximity principle, which means: detecting a UAP in an address segment adjacent to its own IP address. For example, the IP address of the UAP-A that initiates the probe is 10.147.198.130, and the mask is 255.255.255.0. The UAP A detects according to the principle of proximity: the IP address segment adjacent to its own IP address, which may be adjacent to its network segment. Any address segment, such as 10.147.198.129-10.147.198.1 or 10.147.198.131-10.147.198.254 and so on.

After the probe request packet is sent, the other UAPs in the address segment adjacent to the IP address are detected. If the UAP-B is in the address segment, the UAP-B receives the probe request packet. A probe response message will be sent to UAP-A. The probe request message may include, but is not limited to, an Internet Control Message Protocol (ICMP) request packet (ICMP Request), a UDP Echo packet, or a customized private protocol packet.

Step 202: After receiving the probe response message of the UAP-B, the UAP A sends a UAP-transmitted link state information acquisition request to the UAP-B, and receives the transmission link state information of the UAP-B replied by the UAP-B.

The UAP-B can specifically refer to any UAP that works normally except the UAP-A in the network. The probe response message replied by UAP-B can be, but is not limited to, carrying the following information: IP address of UAP-B, tunnel intranet IP of UAP-B, and International Mobile Subscriber Identification Number (IMSI) And the Access Point Equipment Index (APEI) that the access point is shipped from the factory, and may further include: UAP-B name, Access Point Index (APIndex), etc. information.

Step 203: UAP-A saves the obtained UAP information that the transmission link can work normally.

The UAP information that the transmission link can work normally can be, but is not limited to, as shown in Table 1. The intranet IP address refers to: UAP uses Internet Protocol Security (IPsec), and packet security encapsulation. The Encapsulation Security Protocol (ESP), which encapsulates the source IP address used by the inner IP header of the packet. Others refer to: Filling in some characteristic parameters or running parameters, such as CPU usage and number of access users. Wait. Table 1

Step 204: UAP-A and UAP-B can maintain UAP information through a heartbeat mechanism.

When the status of the transmission link of any UAP changes, such as the IP address change, the intranet IP address of the tunnel is changed, TR069 (the protocol used by the UAP to transmit UAP operation and maintenance data), the link is unavailable, etc., through the heartbeat The mechanism notifies other UAPs in a timely manner.

Specifically, when the transmission link state information of the UAP-B is changed, the UAP-B sends a notification message to the UAP-A, and carries the updated transmission link state information of the UAP-B in the notification message, and the UAP A is based on The transmission link state information of the updated UAP-B in the notification message updates the transmission link state information of the UAP-B saved by itself.

It should be noted that the transmission link between the host UAP and the first UAP can be maintained in the following manners:

The first one uses the Stream Control Transmit Protocol (SCTP) to transmit signaling over the IP network. The protocol has high real-time performance, reliability, and definition.

The second type uses the timed ICMP probe to detect once every 3 seconds. If the three consecutive probes do not respond, it confirms that the current host UAP has failed or is powered off, and needs to re-detect another host UAP. Third, use UDP Echo or other proprietary protocols. UDP Echo is a mechanism for detecting the on/off or delay, jitter, and packet loss rate of a transmission link. The UDP protocol is used, and the destination port is 7.

The implementation process includes:

Step 205: When the preset condition is met, the UAP-B receives the start forwarding information.

The startup forwarding information may be sent to the UAP-B by the HMS located on the core network side, or may be

UAP A is sent to UAP-B. The preset condition can be, but is not limited to, the communication link failure between UAP-A and the network side, the remaining life cycle of UAP-A is less than or equal to a preset value, UAP-A receives a command to change the communication link, and the like. The UAP-A and the communication link fault on the network side are taken as an example for description. Therefore, UAP-A can also be called fault UAP.

In one case, when the status of UAP-A maintained at the HMS is offline, the default UAP-A fails, and the HMS sends a start forwarding message to UAP-B (where UAP-B can refer to UAP A except Any normal working UAP). The HMS sends the start forwarding information to the UAP B, which can be sent manually or automatically. Manual transmission means that the HMS operator finds that the status of UAP A is offline. In the pre-obtained UAP, UAP-B is selected as the UAP-A host UAP, or HMS can automatically detect UAP-A offline. UAP B is selected as the host UAP of UAP-A in the pre-obtained UAP that works normally. This method of manually transmitting the forwarding information, although simple in implementation and reliable in function, cannot forward the signaling data and user services of the failed UAP in time, and cannot balance the load on the host UAP. In this way, the method of automatically sending the forwarding information can forward the faulty UAP packet in time, balance the load of the host UAP, and automatically reselect the host UAP.

In the other case, when UAP-A fails, it selects its own host UAP (UAP-B) according to the pre-stored UAP information, and sends the start forwarding information to UAP-B to inform it to start the forwarding function.

The failure of the UAP-A refers to: the IPsec tunnel, SCTP, or the software link, or the software identity bug, or the Subscriber Identity Module (SIM) card is not in place, or the environment is configured. The transmission link of TR069 is faulty. When the host UAP is in the same local area network as the faulty UAP, the IPSec tunnel can be negotiated between the faulty UAP and the host UAP by using the pre-shared key, considering that the amount of UAP communication data between the LANs is small and the frequency of use is low.

If the HMS needs to query or operate the faulty UAP (UAP A), the host UAP (UAP B) sends a command to query or operate the fault UAP. The host UAP parses the command for querying or operating the fault UAP, and determines that it is sent to the fault UAP. The packet is forwarded to the faulty UAP after modifying the contract field in the packet; the fault UAP sends the query or execution result to the host UAP, and the host UAP repackages the query or execution result into a simple object access protocol (Simple Obj ect Access) Protocol, abbreviated as: SOAP) message is forwarded to HMS.

The host UAP uses faults to distinguish its own packets from the faulty UAP packets.

UAP tunnel intranet IP re-encapsulation failure UAP packets are encrypted and then forwarded to SeGW, decrypted by SeGW and forwarded to the core network.

The packet of the faulty UAP can include: Operation and Maintenance Data of the UAP (Operation and Maintenance Data, OM data for short), Signal Data (SIG Data), Circuit Swithing (referred to as: CS) Business data, such as voice services.

If the faulty UAP needs to send a packet, the packet is sent to the host UAP. The host UAP uses the intranet IP address of the faulty UAP to re-encapsulate the packet and then forwards it to the SeGW. The SeGW decrypts the packet and forwards it to the core network.

Further, the method may further include:

Optional step 206: If the CPU usage of the host UAP reaches a certain threshold within a certain period of time, the switching information is sent to the faulty UAP, the faulty UAP is notified to switch the host UAP, and the service forwarding of the faulty UAP is stopped; Switch the information to reselect the host UAP.

Further, if the host UAP can no longer continue to forward the service of the faulty UAP, the method may further include:

Optional step 207: The fault UAP detects a heartbeat retransmission timeout with the host UAP, and then reselects the host UAP. Reselecting the host UAP as described in steps 206 and 207 may include: selecting a host UAP based on the previously obtained UAP information. The following principles must be followed when the host UAP is selected: The number of UAPs that support forwarding faults on the same host UAP is a certain value, and must not exceed the preset value. If the number of UAPs supported by a host UAP is up to the preset value, This UAP is no longer selected as the host UAP.

The embodiment of the present invention provides a method for changing a communication link. When a second UAP that works normally is used as a host UAP of the first UAP, the host UAP forwards the first UAP to the network side. The communication message effectively guarantees the normal communication between the first UAP and the network side, and does not require near-end maintenance, thereby saving maintenance costs.

FIG. 3 is a schematic structural diagram of an access point according to an embodiment of the present invention. The access point is a host UAP that implements the foregoing method embodiment. For the specific implementation manner, refer to the method embodiment, which is not described herein. As shown in FIG. 3, the access point includes: a startup module 301 and a communication module 302. The startup module 301 is configured to receive the startup forwarding information, and start the forwarding function according to the startup forwarding information to become the host UAP of the first UAP. The communication module 302 is configured to forward the communication message of the first UAP and the network side.

In an embodiment, the initiating module 301 includes: a receiving unit, configured to receive, by the first UAP, the initiating forwarding information, where the initiating forwarding information is that the first UAP selects the access point as the host UAP according to the previously obtained UAP information. The message sent.

Further, the access point may further include: an obtaining module, configured to obtain UAP information, where the UAP information is transmission link state information, including: an IP address, an inbound and outbound IP address, an IMSI, and an APEI.

Based on the foregoing implementation manner, the obtaining module may include: a detecting unit and an obtaining unit. The detecting unit is configured to send a probe request message to other UAPs in the address segment adjacent to the IP address. The obtaining module is configured to send a request for obtaining the UAP information to the other UAP if the detecting unit receives the probe response packet of the other UAP. And receive the transmission link status information of other UAP replies.

Further, the obtaining module may further include: an updating unit, configured to receive a notification message sent by another UAP, where the notification message carries the updated transmission link state information of other UAPs; and according to the updated information in the notification message The information updates the transmission link state information of other UAPs saved by itself. In another embodiment, the access point may further include: a switching module, configured to: if the CPU usage of the access point exceeds a preset value, send handover information to the first UAP, where the handover information is used to make the first The UAP reselects the host UAP according to the handover information.

In another embodiment, the startup module 301 includes: a receiving unit, configured to receive startup forwarding information sent by the network side HMS, where the startup forwarding information is a message sent by the HMS after detecting that the preset condition is established.

Further, the initiating module 301 may further include: a sending unit, configured to send the host information to the first UAP, to notify the first UAP that the host UAP is the access point itself.

FIG. 4 is a schematic structural diagram of an access point according to another embodiment of the present invention. The access point is a first UAP that is used in the foregoing method, and the specific implementation manner can be referred to as a method embodiment. . As shown in FIG. 4, the access point includes: a selection module 401 and a communication module 402. The selecting module 401 is configured to: when the preset condition is met, select the second UAP as the host UAP according to the previously obtained UAP information, and send the start forwarding information to the second UAP; the communication module 402 is configured to forward the book by using the second UAP. Communication packets between the access point and the network side.

In an implementation manner, the access point may further include: an obtaining module, configured to send a probe request message to other UAPs in an address segment adjacent to the IP address, and if receiving other probe response packets of the UAP, to the other The UAP sends a request for obtaining UAP information, and receives transmission link state information of other UAP responses.

In another embodiment, the access point may further include: an update module, configured to receive a notification message sent by another UAP, where the notification message carries the updated transmission link state information of other UAPs; according to the notification message The updated information in the update updates the transmission link status of other UAPs saved by itself.

Based on the foregoing embodiment, the access point may further include: a reselection module. In one mode, the reselection module is configured to receive the handover information sent by the second UAP, and reselect the host UAP according to the handover information. In another mode, the reselection module is configured to detect whether the heartbeat retransmission between the access point itself and the second UAP expires. If the timeout expires, the host UAP is reselected. A person skilled in the art can understand that all or part of the steps of implementing the above method embodiments may be completed by using hardware related to program instructions, and the foregoing program may be stored in a computer readable storage medium, and the program is executed when executed. The foregoing steps include the steps of the foregoing method embodiments; and the foregoing storage medium includes: a medium that can store program codes, such as a ROM, a RAM, a magnetic disk, or an optical disk.

The device embodiments described above are merely illustrative, wherein the units illustrated as separate components may or may not be physically separate, and the components displayed as units may or may not be physical units, ie may be located in one place. , or it can be distributed to at least two network elements. Some or all of the modules may be selected according to actual needs to achieve the objectives of the solution of the embodiment. Those of ordinary skill in the art can understand and implement without deliberate labor.

It should be noted that the above embodiments are only for explaining the technical solutions of the present invention, and are not intended to be limiting; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those skilled in the art that: The technical solutions described in the foregoing embodiments are modified, or some of the technical features are equivalently replaced. The modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

Rights request

A method for changing a communication link, comprising:

When the preset condition is met, the working second access point UAP receives the start forwarding information, and starts the forwarding function of the second UAP according to the start forwarding information to become the host UAP of the first UAP;

The second UAP forwards the communication message of the first UAP and the network side.

The method according to claim 1, wherein the receiving, by the second UAP, the initiation and forwarding information comprises:

The second UAP receives the start forwarding information sent by the first UAP, and the start forwarding information is sent by the first UAP to the first UAP according to the UAP information obtained in advance, and is sent to the first UAP. Two UAP information.

The method according to claim 1 or 2, wherein before the second UAP receives the forwarding information, the method further includes:

The second UAP obtains UAP information, where the UAP information is transmission link state information, including: an IP address, a tunnel intranet IP address, an international mobile subscriber identity code IMSI, and a product identifier APEI.

The method according to claim 3, wherein the obtaining, by the second UAP, the UAP information comprises:

And if the second UAP receives the probe response packet of the other UAP, sends a request for acquiring the UAP information to the other UAP, and receives the transmission link state information of the other UAP reply.

The method according to claim 3, wherein the obtaining, by the second UAP, the UAP information further comprises:

Receiving a notification message sent by another UAP, where the notification message carries the updated transmission link state information of other UAPs;

The transmission link state information of other UAPs saved by itself is updated according to the updated information in the notification message.

6. The method according to claim 1, wherein if the CPU of the second UAP The usage rate exceeds a preset value, and the method further includes:

The second UAP sends the handover information to the first UAP, and the handover information is used by the first UAP to reselect the host UAP according to the handover information.

The second UAP receives the start forwarding information sent by the network side UAP management system HMS, and the start forwarding information is information that is sent by the HMS to the second UAP after the preset condition is established.

The method according to claim 7, wherein after the initiating the forwarding function of the second UAP according to the initiating forwarding information, the method further includes:

The second UAP sends a host message to the first UAP, and the host message is the same as the first UAP, and the host UAP is the second UAP.

The method according to claim 7, wherein the sending of the forwarding information is manually triggered or automatically triggered.

The method according to any one of claims 1 to 9, wherein the preset condition is:

The communication link between the first UAP and the network side is faulty;

Or the remaining life cycle of the first UAP is less than or equal to a preset value;

Alternatively, the first UAP receives a command to change the communication link.

11. A method of changing a communication link, the method comprising:

When the preset condition is met, the first access point UAP selects the second UAP as the host UAP according to the previously obtained UAP information, and sends the start forwarding information to the second UAP.

12. The method according to claim 11, wherein the UAP information is obtained by:

The first UAP sends a probe request message to other UAPs in an address segment adjacent to its own IP address; And if the first UAP receives the probe response packet of the other UAP, sends a request for acquiring the UAP information to the other UAP, and receives the transmission link state information of the other UAP reply.

The method according to claim 12, wherein the method further comprises: the first UAP receiving a notification message sent by another UAP, where the notification message carries the updated transmission link of other UAPs. status information;

The method according to any one of claims 11 to 13, wherein the method further comprises:

Receiving, by the first UAP, handover information sent by the second UAP;

The host UAP is reselected according to the switching information.

The first UAP detects whether the heartbeat retransmission between the second UAP and the second UAP times out; if it times out, reselects the host UAP.

16. An access point, comprising:

The startup module is configured to receive the startup forwarding information, and start the forwarding function according to the startup forwarding information to become the host UAP of the first UAP;

The communication module is configured to forward the communication message of the first UAP and the network side.

The access point according to claim 16, wherein the activation module comprises: a receiving unit, configured to receive startup forwarding information sent by the first UAP, where the startup forwarding information is the first UAP according to The pre-obtained UAP information selects the information sent by the access point after the host UAP.

The access point according to claim 16 or 17, further comprising: an obtaining module, configured to obtain UAP information, where the UAP information is transmission link state information, including: an IP address, a tunnel intranet IP address, International Mobile Subscriber Identity (IMSI) and Product Identification APEI.

The access point according to claim 18, wherein the obtaining module comprises: a detecting unit, configured to send a probe request message to other UAPs in an address segment adjacent to the IP address of the user;

And an obtaining unit, configured to: if the detecting unit receives the probe response message of the other UAP, send an acquisition request of the UAP information to the other UAP, and receive the transmission link state information of the other UAP reply.

The access point according to claim 18, wherein the obtaining module further comprises: an updating unit, configured to receive a notification message sent by another UAP, where the notification message carries the updated other UAP Transmitting link state information; updating the transmission link state information of other UAPs saved by itself according to the updated information in the notification message.

The access point according to claim 16, further comprising:

The switching module is configured to send the switching information to the first UAP if the CPU usage of the access point exceeds a preset value, where the switching information is used to enable the first UAP to reselect the host UAP according to the switching information. .

The access point according to claim 16, wherein the activation module comprises: a receiving unit, configured to receive startup forwarding information sent by a network side UAP management system HMS, where the startup forwarding information is the HMS The information sent after the preset condition is established is detected.

The access point according to claim 22, wherein the initiating module further comprises: a sending unit, configured to send host information to the first UAP, to notify the first UAP of its host UAP This is the access point.

24. An access point, comprising:

a selection module, configured to: when the preset condition is met, select a second UAP as a host UAP according to the pre-obtained access point UAP information, and send start forwarding information to the second UAP;

The communication module is configured to forward the communication message with the network side by using the second UAP.

The access point according to claim 24, further comprising:

An obtaining module, configured to send a probe request message to other UAPs in an address segment adjacent to the IP address; and if the other UAP probe response message is received, send a UAP information acquisition request to the other UAP, and receive Transmission link state information of the other UAP reply.

The access point according to claim 25, further comprising: an update module, configured to receive a notification message sent by another UAP, where the notification message carries the updated transmission link status of other UAPs. Information; updating the transmission link state information of other UAPs saved by itself according to the updated information in the notification message.

The access point according to any one of claims 24 to 26, further comprising: a reselection module, configured to receive handover information sent by the second UAP; and reselect the host according to the handover information UAP.

The access point according to any one of claims 24 to 26, further comprising: a reselection module, configured to detect whether a heartbeat retransmission between the second UAP and the second UAP is timed out; , re-select the host UAP.