CN104053199A - Method for switching between wireless local area networks, switching management device, and wireless network - Google Patents
Method for switching between wireless local area networks, switching management device, and wireless network Download PDFInfo
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- CN104053199A CN104053199A CN201310080470.9A CN201310080470A CN104053199A CN 104053199 A CN104053199 A CN 104053199A CN 201310080470 A CN201310080470 A CN 201310080470A CN 104053199 A CN104053199 A CN 104053199A
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Abstract
The embodiment of the invention provides a method for switching between wireless local area networks, a switching management device, and a wireless network, wherein the method is applied to a roaming management network. The wireless network consists of a first wireless local area network and a second wireless local area network; and the first wireless local area network includes a first controller and the second wireless local area network includes a second controller. A client is located in the first wireless local area network initially. The method comprises the following steps that: a switching request and source position information are received, wherein the switching request and the source position information are from the second controller of the second wireless local area network and the source position information records that the source position of the client is at the first wireless local area network; switching of the client is confirmed with the first controller; synchronized relevant data of the client are synchronized from the first controller to the second controller; the second controller distributes the client to the second wireless local area network and connection with the client is established; and after routing information that the client is located in the second wireless local area network is issued, connection establishment information returned by the second controller is received. Therefore, there is no need to provide extra resource synchronization for the roaming client.
Description
Technical field
The present invention relates to radio network technique, refer to especially a kind of method of switching, handover management device and wireless network between WLAN (wireless local area network).
Background technology
WLAN (wireless local area network) (WLAN, Wireless Local Area Networks) connecting system comprises access point (AP, Access Point) and wireless controller (AC, Access Controller), the Radio Control Function module of AC mainly comprises radio frequency resource management, and AP comprises five parts such as management, switching controls, safety function and wireless traffic control.Wireless controller completes WLAN user's access control, charge information gathers and wireless traffic management and control, AC is as the authentication points of WLAN user's access, be connected with the certificate server on backstage, complete the authentication to WLAN user, only have the user through access authentication could pass through WLAN access network access external network or application server.
In the application of WLAN wireless network, three layers of switching comprise: wireless access part is managed certain area as a focus, same or one group of AC can manage different focuses or AP, and a focus can only belong to one or one group of AC, and several AC are installed within the scope of Yi Ge districts and cities.Switch and refer to that the access point that the movement of Internet user between different AP or different focus caused changes, the business that need to guarantee is not interrupted.
Two layers of switching comprise: the prerequisite that client is switched between 2 AP or a plurality of AP be these AP bindings be with 1 service set (SSID, Service Set Identifier) and service VLAN all in same VLAN, be positioned at same IP address field, the switch-in attribute of client in handoff procedure, such as the service VLAN under client and the attributes such as IP address that obtain, do not have any variation, thereby realize, seamlessly transit, do not have the phenomenon of packet loss and disconnection reconnecting.
As shown in Figure 1, two layers of switching under same wireless controller AC: source AP (AP1) and object AP (AP2) are on same AC, and the SSID of broadcast is identical and at same VLAN.When client moves to the coverage of AP2 from AP1, the IP of client and encryption etc. all safeguarded by AC, do not occur that IP changes and authentication etc. again in handoff procedure, is only that change has occurred wireless channel.
Three layers of switching comprise: the prerequisite that client is switched between 2 AP or a plurality of AP be these AP bindings be that same SSID and service VLAN be not in same VLAN, be positioned at different IP address network segments, in the process of roaming switch, the switch-in attribute of client, can change to some extent such as the service VLAN under client and the attributes such as IP address that obtain.
As shown in Figure 2, three layers of switching under same wireless controller AC: source AP (AP1) and object AP (AP2) are on same AC, and the SSID of broadcast is identical but in different wireless local area network.When client moves to AP2 coverage from AP1 coverage, AC is considered as being still client from original vlan and connects, the IP communication that allows client to keep its original IP and support to have set up.
As the SSID of client from original WLAN (wireless local area network) 1, roam into the identical SSID under WLAN (wireless local area network) 2, its IP can't change because of the change of WLAN (wireless local area network), and or carry out communication with original IP in WLAN (wireless local area network) 1.
As shown in Figure 3, across three layers of switching of wireless controller AC, for controller, be split into the situation of different WLAN (wireless local area network), comprise:
Except devolved authentication information, also need to guarantee that IP address is constant.When client moves to the object AP (AP2) of another WLAN (wireless local area network) from the source AP (AP1) of a WLAN (wireless local area network), between two AC, can set up a privately owned communication tunnel, source AC (AC1) is by the relevant information of client (IP address, authentication information etc.) by communication tunnel, pass to object AC (AC2), it is constant that AC2 maintains the IP address of client, but for the network side on upper strata, now remain AC1 and maintain client ip address, all data of issuing this IP address all can arrive first on AC1, AC1 by communication tunnel by data retransmission to AC2, AC2 issues client by data, when client is sent out data to network side, AC2 is given to AC1 by data, by AC1, data are dealt into network side.
Client is the SSID under the VLAN100 of AC1 originally, roams into the identical SSID under the VLAN200 of AC2, and the IP of client can't change because of the change of VLAN, remains with the IP communication in VLAN100.
Above-mentioned technology is that the equipment network providing with producer is provided, and this can be limited to port number and the device processes performance of AC, mainly in the situation that AC group quantity is few, completes handoff functionality.
There are the following problems for prior art: the network port quantity of AC is generally 8 to tens, takes netted connection to take a large amount of network ports and transfer resource, and data synchronization information and routing configuration information also can take the resource of AC; Each producer's equipment adopts different agreements, so the switching between AC is also only confined to producer of the same race equipment, for a service area, has nearly hundred groups of AC, and in the situation that these nearly hundred groups of AC are provided by several producers, networking is more difficult.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of method of switching between WLAN (wireless local area network), handover management device and wireless network, solve the AC of prior art in wireless network when more, the netted connection between AC and synchronously can take the defect of the ample resources of AC.
For solving the problems of the technologies described above, embodiments of the invention provide a kind of method of switching between WLAN (wireless local area network), be applied to the roaming management module in wireless network, wireless network also comprises: the first WLAN (wireless local area network), the second WLAN (wireless local area network), the first WLAN (wireless local area network) comprises the first controller, the second WLAN (wireless local area network) comprises second controller, and client is initially positioned at the first WLAN (wireless local area network); Method comprises: receive handover request and source location information from the second controller of the second WLAN (wireless local area network), the source position that described source location information has been recorded client is the first WLAN (wireless local area network); And between the first controller, confirm that client switches; The sync correlation data of described client are synchronized to second controller from the first controller; At second controller, described client is dispensed to the second WLAN (wireless local area network), connects with described client, and after issue client terminal is positioned at the routing iinformation of the second WLAN (wireless local area network), receive the built vertical link information that second controller returns.
In described method, after the built vertical link information that reception second controller returns, also comprise: notify between the first controller and client and take out stitches.
In described method, after the built vertical link information that reception second controller returns, also comprise: notice charge system, authentication points is second controller.
In described method, and between the first controller, confirm that client switches, specifically comprise: roaming management module sends client to the first controller and switches and confirm request; Receive the confirmation answer that the first controller returns; The message that has sent and confirmed between the first controller to switch to second controller.
In described method, the sync correlation data of described client are synchronized to second controller from the first controller, specifically comprise: session information and user profile are synchronized to second controller as described sync correlation data from the first controller.
A kind of handover management device, be applied to wireless network, described wireless network also comprises: the first WLAN (wireless local area network), the second WLAN (wireless local area network), and the first WLAN (wireless local area network) comprises the first controller, the second WLAN (wireless local area network) comprises second controller, and client is initially positioned at the first WLAN (wireless local area network); Roaming management module comprises: handover request unit, and for receiving handover request and the source location information from the second controller of the second WLAN (wireless local area network), the source position that described source location information has been recorded client is the first WLAN (wireless local area network); Confirmation unit, for and the first controller between confirm that client switches; Lock unit, for being synchronized to second controller by the sync correlation data of described client from the first controller; With controller interactive unit, for described client being dispensed to the second WLAN (wireless local area network) at second controller, connect with described client, and after issue client terminal is positioned at the routing iinformation of the second WLAN (wireless local area network), receive the built vertical link information that second controller returns.
In described device, also comprise: charging interactive unit, after receiving the built vertical link information that second controller returns, notice charge system authentication points is second controller.
In described device, lock unit comprises: session synchronization unit, for session information is synchronized to second controller as described sync correlation data from the first controller; User's lock unit, for being synchronized to second controller as described sync correlation data from the first controller using user profile.
A wireless network, comprising: roaming management module, the first WLAN (wireless local area network), the second WLAN (wireless local area network), the first WLAN (wireless local area network) comprise the first controller, and the second WLAN (wireless local area network) comprises second controller, and client is initially positioned at the first WLAN (wireless local area network); Roaming management module comprises: handover request unit, and for receiving handover request and the source location information from the second controller of the second WLAN (wireless local area network), the source position that described source location information has been recorded client is the first WLAN (wireless local area network); Confirmation unit, for and the first controller between confirm that client switches; Lock unit, for being synchronized to second controller by the sync correlation data of described client from the first controller; With controller interactive unit, for described client being dispensed to the second WLAN (wireless local area network) at second controller, connect with described client, and after issue client terminal is positioned at the routing iinformation of the second WLAN (wireless local area network), receive the built vertical link information that second controller returns.
In described wireless network, lock unit comprises: session synchronization unit, for session information is synchronized to second controller as described sync correlation data from the first controller; User's lock unit, for being synchronized to second controller as described sync correlation data from the first controller using user profile.
The beneficial effect of technique scheme of the present invention is as follows: in client roam procedure, adopt unified roaming management module to realize synchronous between different wireless local area network of client, network side is directly set up path with the client in current wireless local area network (LAN) after handover success, thereby the AC in wireless network do not need with other AC between realize netted connection and synchronize and transmit data based on this netted connection, saved the resource of AC and wireless network.
Accompanying drawing explanation
Fig. 1 represents the principle schematic of two layers of switching under same wireless controller AC;
Fig. 2 represents the principle schematic of three layers of switching under same wireless controller AC;
Fig. 3 represents the principle schematic across three layers of switching of controller;
Fig. 4 represents a kind of Method And Principle schematic diagram that client is switched of realizing between different wireless local area network;
Fig. 5 represents to be switched to from the first WLAN (wireless local area network) the schematic flow sheet of the second WLAN (wireless local area network).
Embodiment
For making the technical problem to be solved in the present invention, technical scheme and advantage clearer, be described in detail below in conjunction with the accompanying drawings and the specific embodiments.
The present invention relates to three layers of switching across AC, AC in wireless network does not distinguish producer and model, use a set of Broadband authentication charge system, and same SSID, AC has Broadband Remote Access Server (BRAS, Broadband Remote Access Server) function, situation about setting up separately for BRAS and AC is applicable equally.
As shown in Figure 4, wireless network comprises: whole nation level charge system, and whole nation level Radius/Portal server, roaming service provider server, connects each provincial network by national backbone network;
Provincial network comprises: provincial charge system, provincial Radius/Portal server, connect each metropolitan area network by provincial backbone network;
Metropolitan area network comprises: transmission network, transmission network adopts AC access metropolitan area network, in each transmission network, by AP, accesses different clients.
The embodiment of the present invention provides a kind of method of switching between WLAN (wireless local area network), be applied to the roaming management module (SMM in wireless network, Switch Management Module), as shown in Figure 5, wireless network comprises: the first WLAN (wireless local area network) and the second WLAN (wireless local area network), the first WLAN (wireless local area network) comprises the first controller, and the second WLAN (wireless local area network) comprises second controller, and client is initially positioned at the first WLAN (wireless local area network);
Method comprises:
Step 1, receives handover request and source location information from the second controller of the second WLAN (wireless local area network), and the source position that described source location information has been recorded client is the first WLAN (wireless local area network);
Step 2, and between the first controller, confirm that client switches;
Step 3, is synchronized to second controller by the sync correlation data of described client from the first controller;
Step 4, is dispensed to the second WLAN (wireless local area network) at second controller by described client, connects, and after issue client terminal is positioned at the routing iinformation of the second WLAN (wireless local area network), receive the built vertical link information that second controller returns with described client.
The technology that application provides, in client roam procedure, adopt unified roaming management module to realize synchronous between different wireless local area network of client, network side is directly set up path with the client in current wireless local area network (LAN) (i.e. the second WLAN (wireless local area network)) after handover success, thereby the AC in wireless network do not need with other AC between realize netted connection and synchronize and transmit data based on this netted connection, saved the resource of AC and wireless network.
Network organizing mode is consistent with existing network, but (such as disposing in Broadband authentication charge system) increased roaming management module SMM in network, in the technology providing at embodiment, the major function of SMM comprises: whether the information that the AC before receive switching transmits, send successful information; SMM receives handover request, transmits the sync correlation data of client to the AC after switching, and whether receives successful information; And SMM is responsible for the change that AC internetwork roaming switches route.
In a preferred embodiment, after the built vertical link information that reception second controller returns, also comprise: notify between the first controller and client and take out stitches.
In a preferred embodiment, described handover request is sent to the AP being connected with this client by client, by described AP, send to described second controller.
Between roaming management module and charge system, exist network to be connected.
In a preferred embodiment, after the built vertical link information that reception second controller returns, also comprise:
Notice charge system, authentication points is second controller.
In a preferred embodiment, and between the first controller, confirm that client switches, specifically comprise:
Roaming management module sends client to the first controller and switches confirmation request;
Receive the confirmation answer that the first controller returns;
The message that has sent and confirmed between the first controller to switch to second controller.
In a preferred embodiment, the sync correlation data of described client are synchronized to second controller from the first controller, specifically comprise:
Session information and user profile are synchronized to second controller as described sync correlation data from the first controller.
Second controller is dispensed to the second WLAN (wireless local area network) by client, connect with described client, and after issue client terminal is positioned at the routing iinformation of the second WLAN (wireless local area network), network side sends to the data of the IP address of client will be sent to second controller.
In an application scenarios, as shown in Figure 5, the flow process that client is switched to the second WLAN (wireless local area network) (VLAN200) from the first WLAN (wireless local area network) (VLAN100) comprises:
Step 1, client roams into object AP from source AP.
Step 2, client is sent handover request and source location information is provided to object AC by object AP.
Step 3, object AC sends handover request and source location information is provided to roaming management module SMM.
Step 4, SMM sends client to source AC and switches confirmation request.
Step 5, source AC sends and confirms to answer to SMM.
Step 6, the message that SMM has sent and confirmed between the AC of source to switch to object AC.
Step 7, under the cooperation of SMM, AC synchronizing information in source is to object AC, that is, the sync correlation data of client are synchronized to second controller from the first controller, specifically comprise: session information and user profile are synchronized to second controller as described sync correlation data from the first controller.
Step 8, it is that client is distributed VLAN that object AC produces user profile, is about to client and is dispensed to the second WLAN (wireless local area network), and activate client.
Step 9, object AC and client connect, and issue new routing iinformation, and the data that network side sends to client will be sent to AC2, by AC2, by AP2, send to client.
Step 10, object AC sends link information to SMM.
Step 11, SMM sends clear message to source AC.
Step 12, source AC and client are taken out stitches.
When client roams into the object AP (AP2) of another one WLAN (wireless local area network) from the source AP (AP1) of a WLAN (wireless local area network), between two AC and SMM, all can set up a communication tunnel.
Source AC (AC1) can pass to object AC (AC2) by communication tunnel by the relevant information of client (IP address, authentication information etc.), it is constant that AC2 maintains the IP address of client, but authentication points can change, notify charge system change or Registration Authentication point simultaneously.For the network side on upper strata, client ip address is that the route of AC1 will be altered to AC2 above, and all data changes of issuing this IP address are to AC2.
The embodiment of the present invention provides a kind of handover management device, be applied to wireless network, described wireless network also comprises: the first WLAN (wireless local area network), the second WLAN (wireless local area network), the first WLAN (wireless local area network) comprises the first controller, the second WLAN (wireless local area network) comprises second controller, and client is initially positioned at the first WLAN (wireless local area network);
Roaming management module comprises:
Handover request unit, for receiving handover request and the source location information from the second controller of the second WLAN (wireless local area network), the source position that described source location information has been recorded client is the first WLAN (wireless local area network);
Confirmation unit, for and the first controller between confirm that client switches;
Lock unit, for being synchronized to second controller by the sync correlation data of described client from the first controller;
With controller interactive unit, for described client being dispensed to the second WLAN (wireless local area network) at second controller, connect with described client, and after issue client terminal is positioned at the routing iinformation of the second WLAN (wireless local area network), receive the built vertical link information that second controller returns.
In a preferred embodiment, also comprise:
Charging interactive unit, after receiving the built vertical link information that second controller returns, notice charge system authentication points is second controller.
In a preferred embodiment, confirmation unit comprises:
Request transmitting unit, switches confirmation request for send client to the first controller;
Confirm receiving element, the confirmation answer of returning for receiving the first controller;
Message sending unit, for the message that has sent to second controller and confirmed between the first controller to switch.
In a preferred embodiment, lock unit comprises:
Session synchronization unit, for being synchronized to second controller as described sync correlation data from the first controller using session information;
User's lock unit, for being synchronized to second controller as described sync correlation data from the first controller using user profile.
The embodiment of the present invention provides a kind of wireless network, as shown in Figure 4, comprise: roaming management module, the first WLAN (wireless local area network), the second WLAN (wireless local area network), the first WLAN (wireless local area network) comprise the first controller, and the second WLAN (wireless local area network) comprises second controller, and client is initially positioned at the first WLAN (wireless local area network);
Roaming management module comprises:
Handover request unit, for receiving handover request and the source location information from the second controller of the second WLAN (wireless local area network), the source position that described source location information has been recorded client is the first WLAN (wireless local area network);
Confirmation unit, for and the first controller between confirm that client switches;
Lock unit, for being synchronized to second controller by the sync correlation data of described client from the first controller;
With controller interactive unit, for described client being dispensed to the second WLAN (wireless local area network) at second controller, connect with described client, and after issue client terminal is positioned at the routing iinformation of the second WLAN (wireless local area network), receive the built vertical link information that second controller returns.
In a preferred embodiment, lock unit comprises:
Session synchronization unit, for being synchronized to second controller as described sync correlation data from the first controller using session information;
User's lock unit, for being synchronized to second controller as described sync correlation data from the first controller using user profile.
Adopt this programme advantage to be afterwards: to adopt unified roaming management module SMM administrative client to switch between different wireless local area network, even under the more situation of AC, can not affect between synchronizing process: SMM and the first controller and second controller and by router, set up and control tunnel respectively yet, source AC is synchronized to second controller as sync correlation data from the first controller by controlling tunnel and SMM using the session information of client and user profile, it is that client is distributed VLAN that object AC produces user profile, connects with client; SMM notice charge system authentication points is after this second controller, by second controller be responsible for and client between data sending and receiving, make each AC not need to consider to set up based on the netted communication being connected and data path with other AC, the client that is not required to be roaming provides extra resource to realize synchronously.
The above is the preferred embodiment of the present invention; it should be pointed out that for those skilled in the art, do not departing under the prerequisite of principle of the present invention; can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (10)
1. a method of switching between WLAN (wireless local area network), be applied to the roaming management module in wireless network, it is characterized in that, wireless network also comprises: the first WLAN (wireless local area network), the second WLAN (wireless local area network), the first WLAN (wireless local area network) comprises the first controller, the second WLAN (wireless local area network) comprises second controller, and client is initially positioned at the first WLAN (wireless local area network);
Method comprises:
Reception is from handover request and the source location information of the second controller of the second WLAN (wireless local area network), and the source position that described source location information has been recorded client is the first WLAN (wireless local area network);
And between the first controller, confirm that client switches;
The sync correlation data of described client are synchronized to second controller from the first controller;
At second controller, described client is dispensed to the second WLAN (wireless local area network), connects with described client, and after issue client terminal is positioned at the routing iinformation of the second WLAN (wireless local area network), receive the built vertical link information that second controller returns.
2. method according to claim 1, is characterized in that, after the built vertical link information that reception second controller returns, also comprises:
Notify between the first controller and client and take out stitches.
3. method according to claim 1, is characterized in that, after the built vertical link information that reception second controller returns, also comprises:
Notice charge system, authentication points is second controller.
4. method according to claim 1, is characterized in that, and between the first controller, confirms that client switches, and specifically comprises:
Roaming management module sends client to the first controller and switches confirmation request;
Receive the confirmation answer that the first controller returns;
The message that has sent and confirmed between the first controller to switch to second controller.
5. method according to claim 1, is characterized in that, the sync correlation data of described client are synchronized to second controller from the first controller, specifically comprises:
Session information and user profile are synchronized to second controller as described sync correlation data from the first controller.
6. a handover management device, it is characterized in that, be applied to wireless network, described wireless network also comprises: the first WLAN (wireless local area network), the second WLAN (wireless local area network), the first WLAN (wireless local area network) comprises the first controller, the second WLAN (wireless local area network) comprises second controller, and client is initially positioned at the first WLAN (wireless local area network);
Roaming management module comprises:
Handover request unit, for receiving handover request and the source location information from the second controller of the second WLAN (wireless local area network), the source position that described source location information has been recorded client is the first WLAN (wireless local area network);
Confirmation unit, for and the first controller between confirm that client switches;
Lock unit, for being synchronized to second controller by the sync correlation data of described client from the first controller;
With controller interactive unit, for described client being dispensed to the second WLAN (wireless local area network) at second controller, connect with described client, and after issue client terminal is positioned at the routing iinformation of the second WLAN (wireless local area network), receive the built vertical link information that second controller returns.
7. device according to claim 6, is characterized in that, also comprises:
Charging interactive unit, after receiving the built vertical link information that second controller returns, notice charge system authentication points is second controller.
8. device according to claim 6, is characterized in that, lock unit comprises:
Session synchronization unit, for being synchronized to second controller as described sync correlation data from the first controller using session information;
User's lock unit, for being synchronized to second controller as described sync correlation data from the first controller using user profile.
9. a wireless network, it is characterized in that, comprise: roaming management module, the first WLAN (wireless local area network), the second WLAN (wireless local area network), the first WLAN (wireless local area network) comprise the first controller, and the second WLAN (wireless local area network) comprises second controller, and client is initially positioned at the first WLAN (wireless local area network);
Roaming management module comprises:
Handover request unit, for receiving handover request and the source location information from the second controller of the second WLAN (wireless local area network), the source position that described source location information has been recorded client is the first WLAN (wireless local area network);
Confirmation unit, for and the first controller between confirm that client switches;
Lock unit, for being synchronized to second controller by the sync correlation data of described client from the first controller;
With controller interactive unit, for described client being dispensed to the second WLAN (wireless local area network) at second controller, connect with described client, and after issue client terminal is positioned at the routing iinformation of the second WLAN (wireless local area network), receive the built vertical link information that second controller returns.
10. wireless network according to claim 9, is characterized in that,
Lock unit comprises:
Session synchronization unit, for being synchronized to second controller as described sync correlation data from the first controller using session information;
User's lock unit, for being synchronized to second controller as described sync correlation data from the first controller using user profile.
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| CN105744579B (en) * | 2014-12-11 | 2019-06-18 | 华为技术有限公司 | Method, switching control and the access device that terminal switches between AP |
| CN104852837A (en) * | 2015-04-29 | 2015-08-19 | 北京海尔广科数字技术有限公司 | Multi-control-center switching method, multi-control-center switching device and control center in home network |
| CN105897724A (en) * | 2016-05-05 | 2016-08-24 | 张胜利 | Method for wireless terminal networking based on fat APs and method for wandering among fat APs |
| CN110771212A (en) * | 2017-05-02 | 2020-02-07 | 无线通信与技术公司 | System and method for connection and handoff management across networks and SSIDS |
| CN110771212B (en) * | 2017-05-02 | 2022-04-05 | 无线通信与技术公司 | System and method for connection and handoff management across networks and SSIDS |
| US11452022B2 (en) | 2017-05-02 | 2022-09-20 | Airties Kablosuz Iletisim Sanayi Ve Dis Ticaret A.S. | System and method for connection and hand-over management across networks and SSIDs |
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| CN104053199B (en) | 2018-05-15 |
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