CN101286909B

CN101286909B - Method of automatically constructing wireless distributed system

Info

Publication number: CN101286909B
Application number: CN2008100479631A
Authority: CN
Inventors: 左冬红; 杜旭; 李军亮; 彭炼钢; 李�浩
Original assignee: Huazhong University of Science and Technology
Current assignee: Huazhong University of Science and Technology
Priority date: 2008-06-10
Filing date: 2008-06-10
Publication date: 2010-10-13
Anticipated expiration: 2028-06-10
Also published as: CN101286909A

Abstract

The invention discloses a method for automatically constructing a wireless distribution system, which is used for automatically constructing the wireless distribution system under the circumstance that a plurality of access points do not need user configuration and comprises the steps as follows: the access points continuously broadcast detection frames of the wireless distribution system (WDS) that contain MAC address of the access points; WDS detection frames from other access points are monitored and MAC address is resolved to establish data links; the access points are checked to confirm if the access points are gateways, if so, the access points are configured to be a DHCP server, otherwise, a local area network is checked to confirm if the DHCP server exists in the local area network; if the DHCP server exist in the local area network, a DHCP client is started; if the DHCP server does not exist in the local area network, the access points are configured as the DHCP server; at the same time, that whether other DHCP servers are accessed into the network is detected; if so, the DHCP server of the access points is shut off and the DHCP client is started. The method of the invention can realize the connection of the wireless distribution system, without manual setting by the user.

Description

A kind of method of automatically constructing wireless distributed system

Technical field

The present invention relates to wireless communication field, be specifically related to the method for a kind of automatic configuration and line wireless distribution system configuration.

Background technology

The framework of present modal WLAN (wireless local area network) is to comprise an access point (AccessPoint in the local area network (LAN), AP) and a plurality of wireless terminal, AP can connect by cable connection and cable network on the one hand, can be connected with wireless terminal by radio wave on the one hand, realized the communication between the wireless terminal, and communicating by letter between wireless terminal and the cable network.In an AP and its signal coverage areas set of wireless terminal just be called primary service area (Basic Service Set, BSS).

In the wireless network protocols of 802.11 definition, (Wireless DistributedSystem is exactly to be used for realizing interconnected between the above-mentioned BSS WDS), thereby enlarges the scope that WLAN (wireless local area network) covers wireless distribution system.For fear of channel disturbance, influence transmission quality, the number of the access point among the WDS generally is no more than four.

When the wireless distribution system networking, each interconnected AP must know the other side Media Access Control address (Media Access Control, MAC), service set (Service Set ID, SSID), channel channel and cipher mode.These parameters in traditional WDS uses, all need the user manually to be provided with.Service set, channel and cipher mode can be set to identical when dispatching from the factory, and also can provide interface for user's Dynamic Selection simultaneously.In addition, because the connection of setting up between the different AP is based on data link layer, in order to guarantee the transfer of data on network layer between the AP, each AP must operate in the identical subnet scoping, this needs the user to select an AP as gateway again, and the IP address that disposes each AP.Traditional like this mode has not only increased the weight of user configured burden, nor is beneficial to the quick deployment and the expansion of wireless network.

Summary of the invention

The objective of the invention is to propose a kind of method of automatic configuration wireless distribution system, do not needing automatically constructing wireless distributed system under the user configured situation.

A kind of method of automatically constructing wireless distributed system comprises a plurality of access points, and each access point is carried out following steps:

(1) the interval broadcast packet contains wireless distribution system (WDS) explore frame of this access point MAC Address;

(2) monitoring parses MAC Address from the WDS explore frame of other access points, sets up data link and connects;

(3) check whether oneself can make gateway, if, then oneself is configured to Dynamic Host Configuration Protocol server, for other access point distributing IP address, enter step (6); Otherwise, enter step (4);

(4) detect in the local area network (LAN) whether Dynamic Host Configuration Protocol server is arranged,, then start dhcp client, ask for the IP address, enter step (6) to Dynamic Host Configuration Protocol server if having; If do not have, then oneself is configured to Dynamic Host Configuration Protocol server, for other access point distributing IP address, enter step (5);

(5) whether detecting has other Dynamic Host Configuration Protocol server access network that can make gateway, if having, then closes the Dynamic Host Configuration Protocol server of oneself, starts dhcp client, asks for the IP address to the Dynamic Host Configuration Protocol server that can make gateway, enters step (6), otherwise, enter step (5).

(6) judge whether network works, if not, then change step (3) over to, otherwise finish.

The invention provides a kind of method of automatic configuration, realize that automatically the data link layer between the access point AP is interconnected under the situation that makes the user need not to dispose; A kind of mechanism is provided, and the gateway of detection wireless distributed system WDS and dynamic host configuration protocol DHCP server place access point, and the IP address that disposes other access point seamlessly make up a WDS system between each AP.The present invention need not any interference of user, can realize the configuration and the line of wireless distribution system.

Description of drawings

Fig. 1 is a flow chart of steps of the present invention.

Fig. 2 broadcasts the detail flowchart of WDS explore frame for the present invention.

Fig. 3 sets up the detail flowchart of data link for the present invention.

Fig. 4 surveys the detail flowchart of WDS gateway and Dynamic Host Configuration Protocol server for the present invention.

Embodiment

Below in conjunction with accompanying drawing embodiment is elaborated.

Fig. 1 is a flow chart of steps of the present invention, is specially:

Step 101, preparation beginning WDS disposes automatically and is connected;

Step 102, the continuous broadcast packet of access point contains the WDS explore frame of this access point MAC Address, and detailed process is seen Fig. 2;

Step 103 is monitored the WDS explore frame from other access points, and is parsed MAC Address to set up data link, and detailed process is seen Fig. 3;

Step 104, gateway and the Dynamic Host Configuration Protocol server place access point of detection WDS, and the IP address that disposes other access point, detailed process is seen Fig. 4;

Step 105 judges whether network works, if, then enter step 106, otherwise, change step 104 over to;

Step 106 finishes.

Fig. 2 has shown that the present invention broadcasts the detail flowchart of WDS explore frame, is specially:

Step 201, AP prepares to go on the air the WDS explore frame;

Step 202, MAC Address is write the WDS explore frame, as the beacon frame, and the FrDS position of inciting somebody to action wherein is 1, do not process after making wireless subscriber terminal receive such beacon frame, have only the AP that opens the WDS function can receive such beacon frame and handle, broadcast packet contains the WDS explore frame of this access point MAC Address;

Step 203 is waited for N second, 0≤N≤10;

Step 204 has judged whether to withdraw from signal, if having, then enters step 205, if do not have, then changes step 202 over to;

Step 205 finishes broadcasting.

Fig. 3 has shown that AP of the present invention sets up the detail flowchart of data link, is specially:

Step 301 is prepared to begin to monitor and resolve the WDS explore frame, as the beacon frame;

Step 302 is monitored FrDS position from other access points and is 1 beacon frame;

Step 303 if do not receive explore frame, is then got back to step 302 and is continued to monitor, if receive, then enters step 304;

Step 304 parses the other side's MAC Address from the WDS explore frame;

Step 305 is inserted the other side's of parsing MAC Address in the local mac tabulation, and sets up the connection of data link layer with this;

Step 306 has judged whether to withdraw from signal, if having, then enters step 307, if do not have, then changes step 302 over to;

Step 307 is monitored and is finished.

Fig. 4 has shown that the present invention surveys the detail flowchart of WDS gateway and Dynamic Host Configuration Protocol server, is specially:

Step 401 is prepared to begin to survey the WDS gateway, and carries out the DHCP configuration of each access point;

Step 402 detects this access point and whether can be used as gateway, if can not, then enter step 404, if can, then change step 403 over to;

Step 403 starts Dynamic Host Configuration Protocol server, for other access point distributing IP address, enters step 410;

Step 404 starts dhcp client, broadcasting DHCP request, and the search Dynamic Host Configuration Protocol server obtains the IP address;

Step 405 judges whether to get access to the IP address, if get access to, then illustrates to have Dynamic Host Configuration Protocol server among the WDS, enters step 410, if do not obtain, then illustrates not have Dynamic Host Configuration Protocol server among the WDS, enters step 406;

Step 406 starts Dynamic Host Configuration Protocol server, is other access point distributing IP addresses.Do not exist gateway among the WDS this moment, and all wireless terminals can not connect the local area network (LAN) of being made up of each AP, can not visit outer net;

Step 407, broadcasting DHCP request can be as the Dynamic Host Configuration Protocol server of gateway among the search WDS;

Step 408 is replied according to whether receiving DHCP, judges whether there are other Dynamic Host Configuration Protocol server among the WDS, if exist, then enters step 409, if do not exist, then changes step 407 over to, continues broadcasting DHCP request;

Step 409, find the AP that can make gateway this moment, so close Dynamic Host Configuration Protocol server, starts dhcp client, obtains the IP address in the Dynamic Host Configuration Protocol server from this AP;

Step 410 is judged whether operate as normal of network, if then enter step 411; Otherwise change step 402 over to;

Step 411 finishes to survey.

Claims

1. the method for an automatically constructing wireless distributed system comprises a plurality of access points, and each access point is carried out following steps:

(1) the interval broadcast packet contains the wireless distribution system WDS explore frame of this access point MAC Address;

(2) monitoring parses the other side's MAC Address from the WDS explore frame of other access points, sets up data link and connects;

(5) whether detecting has other Dynamic Host Configuration Protocol server access network that can make gateway, if having, then closes the Dynamic Host Configuration Protocol server of oneself, starts dhcp client, asks for the IP address to the Dynamic Host Configuration Protocol server that can make gateway, enters step (6), otherwise, enter step (5);