CN103517341B - Split the method, system and device of flow in a kind of WLAN - Google Patents

Abstract

The invention discloses a method for segmenting traffic in a wireless local area network, comprising: an AP receives a network name selected by a WLAN user terminal according to data services, and creates a mapping relationship between the network name and an AC address according to the selected network name; the WLAN user terminal connects After entering the access network, the AP sends the user data sent by the WLAN user terminal to the AC corresponding to the network name of the access network according to the mapping relationship between the network name and the AC address; the present invention also provides a wireless A system for segmenting traffic in a local area network. According to the technical solution of the present invention, the problems of excessive data flow burden and data flow detours on the AC in the prior art are solved.

Description

Method, system and device for segmenting traffic in wireless local area network

technical field

The present invention relates to traffic segmentation technology in wireless communication, in particular to a method, system and device for segmenting traffic in wireless local area network.

Background technique

Wireless Local Area Network (WLAN, Wireless Local Area Network) is a wireless broadband access method that can support mobility within a certain area, and provides a broadband access method for WLAN user terminals to access the Internet. Through the WLAN access system, WLAN user terminals can use various Internet services such as WWW, FTP, and E-mail at high speed.

The WLAN access system is mainly composed of an access point (AP, Access Point) and an access controller (AC, AccessController). The WLAN access system is used to complete WLAN user terminal access, access control, charging information collection and Business management and control, etc. The access point is a small wireless base station device in the WLAN access system. It is used to complete the wireless access involved in the 802.11 series standards. The access point is also a network bridge, which serves as a bridge connecting the wired network and the wireless network. Any WLAN user All terminals can access wired network resources through corresponding access points.

In terms of security control, the access point can control the access of WLAN user terminals through network identifiers and media access control (MAC, Media AccessControl) addresses; at the same time, the access point supports the air encryption function of (WEP, Wired EquivalentPrivacy) technology, Protect the information security of WLAN user terminals. In terms of data communication, the access point is responsible for encrypting and decrypting the data packets exchanged between itself and the WLAN user terminal.

At present, the WLAN access system deployed by operators usually includes two main devices, AP and AC. The AP is responsible for providing wireless signals, and the AC is responsible for the management, Aggregator of multiple data flows. Usually, the data traffic of the user corresponding to the AP is uniformly sent to the AC corresponding to the AP without distinction, and the AC is usually deployed in the equipment room at the aggregation location, because the AC is an important control point and traffic aggregation point of the WLAN, and The user data traffic sent by the WLAN is large, which will cause a large data traffic on the AC. After the large-scale network development, the AC will be difficult to control.

Figure 1 is a schematic diagram of the topological relationship between AP and AC in the access system in the prior art. The user terminal accesses the service network through the data network of the AC. There are two main problems with this approach:

1) The aggregation of data traffic to the same AC will bring a large processing burden to the AC, which will reduce the processing capacity of the AC, thus forming a bottleneck of processing speed;

2) If the data service accessed by the WLAN user terminal is in the service network 2 corresponding to AC2, then the data traffic sent to AC1 through the AP needs to be detoured from the service network 1 to the service network 2, which will cause a large network delay and affect the user's performance. business experience.

At present, there are some solutions to the problem of unloading data traffic, such as the invention patent application number 200910091448.8, which discloses a wireless network deployment method and a wireless access point, and specifically discloses the following technical solutions: one AP and more than one AC respectively To establish a tunnel connection, the AP independently downloads and maintains a set of AP configurations for each tunnel, establishes a corresponding BSS for each tunnel, and provides wireless network services through the BSS; when the AP receives uplink data from the wireless terminal, it The ID determines a forwarding tunnel, and sends the uplink data to the corresponding AC through the determined forwarding tunnel. This solution enables one AP to establish connections with multiple ACs, avoiding network performance degradation caused by repeated deployment of APs by multiple operators in the same area; however, this solution enables one AP to establish connections with multiple ACs, but it does not solve the problem. The problem of traffic aggregation on the AC. In addition, if the load balancing method is used to reduce the load of the network intermediate device AC, this method can only be applied to a local area network, and lacks global deployment and configuration capabilities.

Contents of the invention

In view of this, the main purpose of the present invention is to provide a method, system and device for segmenting traffic in a wireless local area network, so as to solve the problems of excessive data traffic burden and detours on the AC in the prior art.

In order to achieve the above object, technical solution of the present invention is achieved in that way:

The present invention provides a method for dividing traffic in a wireless local area network. The access point AP receives the network name selected by the WLAN user terminal according to the data service, and creates a mapping relationship between the network name and the AC address of the access controller according to the selected network name. ; the method also includes:

After the WLAN user terminal accesses the access network, the AP sends the user data sent by the WLAN user terminal to the AC corresponding to the network name of the access network according to the mapping relationship between the network name and the AC address.

In the above method, the AP receives the network name selected by the WLAN user terminal according to the data service, and creates a mapping relationship between the network name and the AC address according to the selected network name as follows:

AP broadcast network name;

The AP receives the network name selected by the WLAN user terminal based on the data service, and sends a query request message to the name server according to the network name selected by the WLAN user terminal; the name server queries the corresponding AC locally according to the network name in the query request message. Address and return to AP;

The AP creates a mapping relationship between the network name and the AC address according to the selected network name and the queried AC address, and establishes a data tunnel between itself and the AC address.

In the above method, the AP broadcast network name is:

Each AP in the access system regularly sends out a broadcast message according to a pre-configured broadcast period; the broadcast message carries an indication frame, and a network name is added to the SSID field of the indication frame.

In the above method, the name server queries the corresponding AC address locally according to the network name in the query request message and returns it to the AP as follows:

Pre-configure the correspondence between the network name and the AC address in the name server;

After the name server receives the query request message sent by the AP, it verifies the IP address of the AP according to the local pre-configured IP address library of the trusted AP;

When the IP address library of the trusted AP has the IP address of the AP, the name server searches for the IP address corresponding to the network name according to the network name in the query request message and the correspondence between the locally stored network name and the AC address. AC address, and sends the found AC address to the AP through a query response message.

In the above method, the method also includes:

When the IP address database of the trusted AP does not have the IP address of the AP, the name server refuses to query the AC address for the AP, and sends a query failure message to the AP.

In the above method,

The name server is integrated in the domain name system DNS;

The integration method is to add a correspondence table in the DNS server, and the entries in the correspondence table are the correspondences between network names and AC addresses.

In the above method, the AP sends the user data sent by the WLAN user terminal to the AC corresponding to the network name of the access network according to the mapping relationship between the network name and the AC address:

The AP searches for the AC address corresponding to the network name of the access network in the saved mapping relationship between the AC address and the network name according to the access network accessed by the WLAN user terminal;

The AP sends the user data sent by the WLAN user terminal to the AC address through the established data tunnel between itself and the AC according to the found AC address.

The present invention also provides a method for segmenting traffic in a wireless local area network, including:

The WLAN user terminal selects a network name from the network names broadcast by the AP according to its own data service.

In the above method, the WLAN user terminal selects the network name from the network names broadcast by the AP according to its own data service as:

When the WLAN user terminal searches for the network, the WLAN user terminal receives broadcast messages sent by each AP, and obtains at least two network names from the broadcast messages;

The WLAN user terminal independently selects a network name from the network names broadcast by the AP according to its own data service;

After the network name is selected, a connection between access networks corresponding to the network name is established.

The present invention also provides a system for segmenting traffic in a wireless local area network, including: a WLAN user terminal, an AP, and an AC; wherein,

The AP is used to receive the network name selected by the WLAN user terminal according to the data service, and create a mapping relationship between the network name and the AC address according to the selected network name; it is also used to map the WLAN to the AC address according to the mapping relationship between the network name and the AC address. The user data sent by the user terminal is sent to the AC corresponding to the network name of the access network;

The WLAN user terminal is configured to select a network name from the network names broadcast by the AP according to its own data service.

In the above system, the system also includes:

The name server is used to save the corresponding relationship between the network name and the AC address;

The name server is further configured to, when receiving the query request message sent by the AP, query the corresponding AC address locally according to the network name in the query request message and return it to the AP.

The present invention also provides an AP, including: a mapping creation unit and a data forwarding unit; wherein,

The mapping creation unit is used to receive the network name selected by the WLAN user terminal according to the data service, and create a mapping relationship between the network name and the AC address of the access controller according to the selected network name;

The data forwarding unit is used for sending the user data sent by the WLAN user terminal to the network of the access network according to the mapping relationship between the network name and the AC address created by the mapping creation unit after the WLAN user terminal accesses the access network The AC corresponding to the name.

The present invention also provides a WLAN user terminal, which is characterized in that the WLAN user terminal is used to select a network name from the network names broadcast by the AP according to its own data service.

In the method, system and device for segmenting traffic in the wireless local area network provided by the present invention, the AP receives the network name selected by the WLAN user terminal according to the data service, and creates a mapping relationship between the network name and the AC address according to the selected network name; the WLAN user terminal After accessing the access network, the AP sends the user data sent by the WLAN user terminal to the AC corresponding to the network name of the access network according to the mapping relationship between the network name and the AC address; thus, the WLAN user terminal is Different network names are selected for different data services, and the AP establishes connections with ACs based on the selected network names, so that one AP can establish connections with multiple ACs; when data services need to be sent, the AP will use different network names to User data is sent to different ACs, and the data traffic on the AC is offloaded and divided, thereby solving the problem of excessive data traffic burden on the AC in the prior art; at the same time, it solves the problem of data traffic detours and improves the efficiency of user access.

Description of drawings

FIG. 1 is a schematic diagram of a topology relationship between an AP and an AC in an access system in the prior art;

Fig. 2 is a schematic flow diagram of the method for realizing traffic segmentation in a wireless local area network according to the present invention;

Fig. 3 is a schematic flow chart of a specific implementation method of step 201 in the present invention;

Fig. 4 is a schematic diagram of the topology relationship between AP and AC in the access system in the present invention;

FIG. 5 is a schematic structural diagram of a system for realizing traffic segmentation in a wireless local area network according to the present invention.

detailed description

The basic idea of the present invention is: the AP receives the network name selected by the WLAN user terminal according to the data service, and creates a mapping relationship between the network name and the AC address according to the selected network name; after the WLAN user terminal accesses the access network, the The AP sends the user data sent by the WLAN user terminal to the AC corresponding to the network name of the access network according to the mapping relationship between the network name and the AC address.

The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

The present invention provides a method for segmenting traffic in a wireless local area network. Fig. 2 is a schematic flow diagram of the method for realizing traffic splitting in a wireless local area network according to the present invention. As shown in Fig. 2, the method includes the following steps:

In step 201, the AP receives the network name selected by the WLAN user terminal according to the data service, and creates a mapping relationship between the network name and the AC address according to the selected network name.

Step 202, after the WLAN user terminal accesses the access network, the AP sends the user data sent by the WLAN user terminal to the AC corresponding to the network name of the access network according to the mapping relationship between the network name and the AC address;

Specifically, since the AP stores the corresponding relationship between the AC address and the network name, when the WLAN user terminal accesses the access network and sends user data to the AP, the AP, according to the access network accessed by the WLAN user terminal, In the saved mapping relationship between the AC address and the network name, search for the AC address corresponding to the network name of the access network, and according to the found AC address, through the established data tunnel between itself and the AC, the user data sent by the WLAN user terminal Send to the AC address; in this way, the user data on an AP can correspond to different network names according to different data networks, and then send user data to different ACs according to different network names, so as to avoid the same AC from receiving multiple APs. The problem of excessive burden caused by user data.

Fig. 3 is a schematic flow chart of a specific implementation method of step 201 in the present invention, which is a specific implementation of the AP receiving the network name selected by the WLAN user terminal according to the data service, and creating a mapping relationship between the network name and the AC address according to the selected network name Process, as shown in Figure 3, the method includes the following steps:

Step 301, the AP broadcasts the network name;

Specifically, in the WLAN access system, each AP regularly sends out a broadcast message according to a pre-configured broadcast period, and the broadcast message carries the basic data frame defined in the 802.11 standard, and the AP adds at least two network names to the basic data frame In the frame, for example, the basic data frame can be an indication frame (BeaconFrame) defined in the IEEE802.11-2007 standard, and the network name (WNAME) is added in the SSID field of the indication frame; here, the network name (WNAME) carried by the AP through the broadcast message The name is pre-configured in the AP by the WLAN operator. The WLAN operator will configure different network names according to different data services. For example, the network name of the Internet is WNAME_INTERNET, the network name of the education network is WNAME_EDU, and the network name of the game network is WNAME_EDU. The name is WNAME_GAME.

Step 302, the WLAN user terminal selects a network name from the network names broadcast by the AP according to its own data service;

Specifically, when the WLAN user terminal searches for the network, the WLAN user terminal can receive the broadcast message sent by each AP, and obtain at least two network names from the basic data frame carried in the broadcast message; Select a network name independently from the network names broadcast by the AP. After the network name is selected, the WLAN user terminal establishes a connection with the access network corresponding to the network name. In this way, the AP in the access system can know the WLAN user The network name selected by the terminal;

For example, if the data service of the WLAN user terminal involves the education network, the network name selected by the WLAN user terminal is WNAME_EDU; if the data service of the WLAN user terminal involves online games, then the network name of the WLAN user terminal is WNAME_GAME.

Step 303, the AP receives the network name selected by the WLAN user terminal according to the data service, and sends a query request message to the name server according to the network name selected by the WLAN user terminal;

Specifically, after the AP obtains the network name selected by the WLAN user terminal, it needs to query the corresponding AC address from the name server according to the network name. Therefore, the AP sends a query request message to the name server, which carries the AC address selected by the WLAN user terminal. network name.

Step 304, the name server queries the corresponding AC address locally according to the network name in the query request message and returns it to the AP;

Specifically, Fig. 4 is a schematic diagram of the topological relationship between the AP and the AC in the WLAN access system in the present invention. As shown in Fig. 4, the operator of the WLAN pre-configures the network name (WNAME) and the AC address (WNAME_AC_IP ), the name server saves the correspondence between the network name and the AC address, thus ensuring that after the WLAN user terminal accesses the access network, it can find and access the most suitable AC according to the network name of the access network. For example, for the network name WNAME_EDU, the AC configured by the operator for this network name is the AC with the richest interface bandwidth on the education network. In this way, WLAN user terminals will connect to the AC with the richest interface bandwidth on the education network; for the network name WNAME_GAME, the operator The AC configured by the provider for the network name is the AC in the area where the game base is located or the AC adjacent to the game base, so that the WLAN user terminal will be connected to the AC in the area where the game base is located or the AC adjacent to the game base;

Wherein, the name server can be integrated in the Domain Name System (DNS, Domain Name System), and the integration method is to add a correspondence table in the DNS server, and the entry in the correspondence table is the correspondence between the network name and the AC address; in addition , the name server is only open to trusted APs, for trusted APs to query the AC address, and to reject untrusted APs from querying the AC address. Therefore, the name server needs to verify the IP address of the AP when the AP queries the AC address;

After the name server receives the query request message sent by the AP, first, it verifies the IP address of the AP according to the pre-configured local IP address database of the trusted AP, and judges whether the IP address database of the trusted AP has the AP's IP address. IP address, if there is the IP address of the AP, the verification is passed, and the name server searches for the AC address corresponding to the network name according to the network name in the query request message and the corresponding relationship between the network name and the AC address stored locally. The found AC address is sent to the AP through a query response message; if there is no IP address of the AP, the verification fails, the name server refuses to query the AC address for the AP, and sends a query failure message to the AP.

Step 305, the AP creates a mapping relationship between the network name and the AC address according to the selected network name and the queried AC address, and establishes a data tunnel between itself and the AC address;

Specifically, after receiving the AC address returned by the name server through the query response message, the AP establishes a data tunnel WNAME_TUNNEL between itself and the AC address according to the AC address, as shown in Figure 4, as long as the AP receives a AC address, you can establish a data tunnel with the AC address. After receiving multiple AC addresses, an AP can establish a data tunnel with multiple different ACs, which is convenient for the AP to send user data to different ACs in the future; After the data tunnel, the AP also needs to create a mapping relationship between the received AC address and the network name locally. In this way, after the WLAN user terminal accesses a certain access network, the user data sent by the WLAN user terminal will be sent by the AP to the access network. The AC address corresponding to the network name of the access network, and the corresponding AC performs user data processing.

The present invention also provides a method for dividing traffic in a wireless local area network, the method comprising: WLAN user terminal selects a network name from among network names broadcast by an AP according to its own data service.

Specifically, when the WLAN user terminal searches for the network, the WLAN user terminal can receive the broadcast message sent by each AP, and obtain at least two network names from the basic data frame carried in the broadcast message; Select a network name independently from the network names broadcast by the AP. After the network name is selected, the WLAN user terminal establishes a connection with the access network corresponding to the network name. In this way, the AP in the access system can know the WLAN user The network name selected by the terminal;

For example, if the data service of the WLAN user terminal involves the education network, the network name selected by the WLAN user terminal is WNAME_EDU; if the data service of the WLAN user terminal involves online games, then the network name of the WLAN user terminal is WNAME_GAME.

In order to realize the above method, the present invention also provides a system for segmenting traffic in a wireless local area network. Fig. 5 is a schematic structural diagram of a system for realizing traffic splitting in a wireless local area network according to the present invention. As shown in Fig. 5, the system includes: AP 10, WLAN User terminal 20, AC 30; wherein,

The AP 10 is configured to receive the network name selected by the WLAN user terminal according to the data service, and create a mapping relationship between the network name and the AC address according to the selected network name; it is also used to, according to the mapping relationship between the network name and the AC address, create The user data sent by the WLAN user terminal 20 is sent to the AC 30 corresponding to the network name of the access network;

The WLAN user terminal 20 is configured to select a network name from the network names broadcast by the AP 10 according to its own data service.

The system also includes:

The name server 40 is used for storing the corresponding relationship between the network name and the AC address;

The name server 40 is further configured to, when receiving the query request message sent by the AP 10 , query the corresponding AC address locally and return it to the AP 10 according to the network name in the query request message.

Wherein, the AP 10 receives the network name selected by the WLAN user terminal 20 according to the data service, and creates a mapping relationship between the network name and the AC address according to the selected network name: the AP 10 broadcasts the network name; the AP 10 receives the WLAN user terminal 20 sends a query request message to the name server 40 according to the network name selected by the data service, and according to the network name selected by the WLAN user terminal 20; the name server 40 queries the corresponding AC address locally according to the network name in the query request message And return it to AP 10; AP 10 creates a mapping relationship between the network name and the AC address according to the selected network name and the queried AC address, and establishes a data tunnel between itself and the AC address.

Wherein, the AP 10 sends the user data sent by the WLAN user terminal 20 to the AC 30 corresponding to the network name of the access network according to the mapping relationship between the network name and the AC address. AP 10 searches for the AC address corresponding to the network name of the access network in the stored mapping relationship between the AC address and the network name; AP 10 uses the established AC address based on the AC address established between itself and the AC. A tunnel, sending the user data sent by the WLAN user terminal 20 to the AC address.

The present invention also provides an AP. As shown in FIG. 5 , the AP includes: a mapping creation unit 101 and a data forwarding unit 102; wherein,

The mapping creation unit 101 is configured to receive the network name selected by the WLAN user terminal 20 according to the data service, and create a mapping relationship between the network name and the AC address of the access controller according to the selected network name;

The data forwarding unit 102 is configured to send the user data sent by the WLAN user terminal 20 to the access network according to the mapping relationship between the network name and the AC address created by the mapping creation unit after the WLAN user terminal 20 accesses the access network. The network name of the network corresponds to the AC30.

The present invention also provides a WLAN user terminal, which is used for selecting a network name from network names broadcast by an AP according to its own data service.

In the technical solution provided by the invention, different network names can be configured for different data services. Because different data services are generally operated by different provincial and municipal operating organizations, such as the Beijing company deploying the Internet of Things service platform, when the technical solution of the present invention is not used, the WLAN user terminals in other provinces must first be connected to the local backbone network After that, the Internet of Things service platform deployed by the Beijing company can only be opened or accessed by routing to the Internet of Things service platform deployed by the Beijing company; if the technical solution of the present invention is used, WLAN user terminals in other provinces can be routed to the Internet of Things deployed by the Beijing company when the service connection is started. The service platform reduces the detour of user data and improves the efficiency of user access to services.

The above description is only a preferred embodiment of the present invention, and is not used to limit the protection scope of the present invention. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present invention shall be included in the within the protection scope of the present invention.

Claims (13)

1. A method for dividing flow in wireless local area network is characterized in that an access point AP receives a network name selected by a WLAN user terminal according to data service, and creates a mapping relation between the network name and an access controller AC address according to the selected network name; the method further comprises the following steps:

after the WLAN user terminal accesses the access network, the AP sends user data sent by the WLAN user terminal to the AC corresponding to the network name of the access network according to the mapping relation between the network name and the AC address;

before creating the mapping relationship between the network name and the AC address of the access controller according to the selected network name, the method further includes: and the name server verifies the IP address of the AP according to a local pre-configured IP address library of the credible AP.

2. The method of claim 1, wherein the AP receives a network name selected by the WLAN user terminal according to the data service, and creates a mapping relationship between the network name and the AC address according to the selected network name, wherein the mapping relationship comprises:

AP broadcasts the network name;

the AP receives a network name selected by the WLAN user terminal according to the data service, and sends an inquiry request message to the name server according to the network name selected by the WLAN user terminal; the name server locally inquires a corresponding AC address according to the network name in the inquiry request message and returns the AC address to the AP;

and the AP establishes a mapping relation between the network name and the AC address according to the selected network name and the inquired AC address, and establishes a data tunnel between the AP and the AC address.

3. The method of claim 2, wherein the AP broadcasts a network name of:

each AP in the access system sends out broadcast messages regularly according to a preset broadcast period; the broadcast message carries an indication frame, and a network name is added to an SSID field of the indication frame.

4. The method of claim 2, further comprising: the method comprises the steps that the corresponding relation between a network name and an AC address is pre-configured in a name server;

correspondingly, the name server locally queries the corresponding AC address according to the network name in the query request message and returns the AC address to the AP, including:

and when the IP address of the AP exists in the IP address library of the credible AP, the name server searches the AC address corresponding to the network name according to the network name in the query request message and the corresponding relation between the locally stored network name and the AC address, and sends the found AC address to the AP through a query response message.

5. The method of claim 4, further comprising:

and when the IP address of the AP does not exist in the IP address library of the credible AP, the name server refuses to inquire the AC address for the AP and sends an inquiry failure message to the AP.

6. The method of claim 2, 4 or 5,

the name server is integrated in a Domain Name System (DNS);

the integration mode is to add a corresponding relation table in the DNS server, and the table entry in the corresponding relation table is the corresponding relation between the network name and the AC address.

7. The method of claim 1, wherein the AP sends the user data sent by the WLAN user terminal to the AC corresponding to the network name of the access network according to the mapping relationship between the network name and the AC address:

the AP searches an AC address corresponding to the network name of the access network in the stored mapping relation between the AC address and the network name according to the access network accessed by the WLAN user terminal;

and the AP sends the user data sent by the WLAN user terminal to the AC address through the established data tunnel between the AP and the AC according to the found AC address.

8. A method for traffic segmentation in a wireless local area network, the method comprising:

the WLAN user terminal selects a network name from the network names broadcasted by the AP according to the data service of the WLAN user terminal; wherein the method further comprises: the name server verifies the IP address of the AP according to a local pre-configured IP address library of a trusted AP; and the network name is used for the AP to establish a mapping relation between the network name and the AC address, and sending the user data to the corresponding AC according to the mapping relation between the network name and the AC address.

9. The method of claim 8, wherein the WLAN user terminal selects a network name from the network names broadcast by the AP according to its own data service:

when a WLAN user terminal searches a network, the WLAN user terminal receives broadcast messages sent by all APs and acquires at least two network names from the broadcast messages;

the WLAN user terminal autonomously selects a network name from the network names broadcasted by the AP according to the data service of the WLAN user terminal;

and after the network name is selected, establishing connection between the access networks corresponding to the network name.

10. A system for splitting traffic in a wireless local area network, the system comprising: WLAN user terminal, AP, AC; wherein,

the AP is used for receiving the network name selected by the WLAN user terminal according to the data service and creating a mapping relation between the network name and the AC address according to the selected network name; the network access device is also used for sending the user data sent by the WLAN user terminal to the AC corresponding to the network name of the access network according to the mapping relation between the network name and the AC address;

the WLAN user terminal is used for selecting a network name from the network names broadcasted by the AP according to the data service of the WLAN user terminal;

the system further comprises:

and the name server is used for verifying the IP address of the AP according to a local pre-configured IP address library of the credible AP.

11. The system of claim 10,

the name server is used for storing the corresponding relation between the network name and the AC address;

and the name server is also used for locally inquiring the corresponding AC address according to the network name in the inquiry request message and returning the AC address to the AP when receiving the inquiry request message sent by the AP.

12. An access point, AP, comprising: a mapping creation unit and a data forwarding unit; wherein,

the mapping creation unit is used for receiving the network name selected by the WLAN user terminal according to the data service and creating the mapping relation between the network name and the AC address of the access controller according to the selected network name; verifying the IP address of the AP through the name server according to a local pre-configured IP address library of the credible AP to obtain a verification result of the name server;

and the data forwarding unit is used for sending the user data sent by the WLAN user terminal to the AC corresponding to the network name of the access network according to the mapping relation between the network name and the AC address created by the mapping creation unit after the WLAN user terminal accesses the access network.

13. A WLAN user terminal, characterized in that, the WLAN user terminal is configured to select a network name from network names broadcast by an AP according to its own data service; the AP is an AP which verifies the IP address of the AP through a name server according to a local pre-configured IP address library of a credible AP; and the network name is used for the AP to establish a mapping relation between the network name and the AC address, and sending the user data to the corresponding AC according to the mapping relation between the network name and the AC address.