CN104717706A - Wireless local area network (WLAN) smooth roaming method and system, access points and access controller - Google Patents
Wireless local area network (WLAN) smooth roaming method and system, access points and access controller Download PDFInfo
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- CN104717706A CN104717706A CN201310681948.3A CN201310681948A CN104717706A CN 104717706 A CN104717706 A CN 104717706A CN 201310681948 A CN201310681948 A CN 201310681948A CN 104717706 A CN104717706 A CN 104717706A
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Abstract
The invention discloses a wireless local area network (WLAN) smooth roaming method and system, access points and an access controller, and relates to the field of WLAN roaming. Under the current circumstance that an access controller and access point framework of a WLAN is not changed, roaming launch and control are concentrated in the access controller, the access points are responsible for executing roaming launch and control, smooth roaming is achieved under the situation that client equipment has no movement or perception, and the roaming process is simplified. In addition, the access controller selects the optimal access point to forward data of the client equipment according to the quality of connection between the client equipment and the access points, and roaming experiences of users are greatly improved.
Description
Technical field
The present invention relates to WLAN (wireless local area network) (Wireless Local Area Networks, be called for short WLAN) and roam field, particularly the level and smooth loaming method of a kind of WLAN and system and access point and access controller.
Background technology
Along with popularizing of intelligent hand-held terminal, and the fast development in light net city, the radio roaming functional requirement of people to terminal is day by day strong.
The process of carrying out roaming between multiple access points of current client device in wlan system (Access Point, AP) is initiated primarily of client device, roam procedure by client device judges whether to need.In roam procedure, initiated to consult request to newfound AP by client device, and then complete whole roam procedure.
Whether existing WLAN roaming process starts is determined by client device, roam procedure more complicated on the one hand, client device is for ensureing that user data does not interrupt on the other hand, often when current signal strength signal intensity can not maintain proper communication, just cut off current radio signal, reenter the process of wireless signal around detection, therefore, often when client device initiates Roaming Registration request, the wireless experience of user is poor.
Summary of the invention
An object of the embodiment of the present invention is, proposes a kind of new WLAN roaming scheme, to simplify roam procedure.
An object of the embodiment of the present invention is, in WLAN roaming process, the radio roaming improving user is experienced.
According to an aspect of the embodiment of the present invention, propose the level and smooth loaming method of a kind of WLAN, comprising: the facility information copying access controller when each access point adds access controller; In client device registration process, the first access point uses the facility information of the access controller copied to communicate with client device, and the log-on message of client device is sent to access controller; Access controller preserves the log-on message of client device; When client device roams to the overlapping region of the first access point and the second access point wireless coverage, the second access point is in the discovery procedure of client device, whether the second access point uses the facility information of the access controller copied to communicate with client device, and inquire about this client device to access controller and register; The log-on message of this client device, in response to the chartered Query Result of this client device, is sent to the second access point by access controller; Access controller selects the access point of the data forwarding this client device, completes roaming.
In one embodiment, in client device registration process, first access point uses the facility information of the access controller copied to communicate with client device, comprising: the facility information of the access controller copied carries out alternately as the facility information of access point and client device by the first access point; The reception access-in point information of log-on message is set to the facility information of access controller by client device, and sends this log-on message to the first access point; The first access point receiving log-on message is registered client device.
In one embodiment, when client device roams to the overlapping region of the first access point and the second access point wireless coverage, the second access point is in the discovery procedure of client device, second access point uses the facility information of the access controller copied to communicate with client device, and inquire about this client device to access controller whether to register, comprise: when client device roams to the overlapping region of the first access point and the second access point wireless coverage, the second access point is in the discovery procedure of client device, the facility information of the access controller copied carries out alternately as the facility information of access point and client device by the second access point, whether the second access point is inquired about this client device to access controller and is registered.
In one embodiment, access controller selects the access point of the data forwarding this client device, complete roaming to comprise: access controller, according to the quality of connection of client device and access point, is selected the access point of quality of connection optimum to forward the data of this client device, completed roaming.
In one embodiment, the facility information of access controller such as comprises the MAC Address of access controller.
In one embodiment, the log-on message of client device comprises key.
According to another aspect of the embodiment of the present invention, propose the level and smooth roaming system of a kind of WLAN, comprising: access point and access controller; Copying the facility information of access controller when access point is for adding access controller, comprising the first access point and the second access point; In client device registration process, the first access point communicates with client device for using the facility information of the access controller copied, and the log-on message of client device is sent to access controller; When client device roams to the overlapping region of the first access point and the second access point wireless coverage, the second access point is in the discovery procedure of client device, whether the second access point communicates with client device for using the facility information of the access controller copied, and inquire about this client device to access controller and register; Access controller, for preserving the log-on message of client device, in response to the chartered Query Result of this client device, the log-on message of this client device is sent to the second access point, select the access point of the data forwarding this client device, complete roaming.
In one embodiment, first access point is used for the facility information of the access controller copied to carry out alternately as the facility information of access point and client device, to make client device, the reception access-in point information of log-on message is set to the facility information of access controller, and send log-on message to the first access point, the first access point receiving log-on message is registered client device.
In one embodiment, when client device roams to the overlapping region of the first access point and the second access point wireless coverage, the second access point is in the discovery procedure of client device, whether the second access point is used for the facility information of the access controller copied to carry out alternately as the facility information of access point and client device, and inquire about this client device to access controller and register.
In one embodiment, access controller, when selecting the access point of the data forwarding this client device, specifically for the quality of connection according to client device and access point, selects the access point of quality of connection optimum to forward the data of this client device.
According to another aspect of the embodiment of the present invention, propose a kind of access point, comprising: information reproduction module, for copying the facility information of access controller when access point adds access controller; Registering modules, for in client device registration process, use the facility information of the access controller copied to communicate with client device, and the log-on message of client device is sent to access controller, so that access controller preserves the log-on message of client device; Enquiry module, during for roaming to the overlapping region of access point wireless coverage at client device, new access point is to in the discovery procedure of client device, the facility information of the access controller copied is used to communicate with client device, and inquire about this client device to access controller whether to register, so that the log-on message of this client device, in response to the chartered Query Result of this client device, is sent to new access point by access controller; Forwarding module, for the selection according to access controller, forwards or abandons the data of this client device, complete roaming.
In one embodiment, Registering modules, carry out alternately specifically for the facility information of access controller that will copy as the facility information of access point and client device, so that the reception access-in point information of log-on message is set to the facility information of access controller by client device, and send log-on message to the first access point, after receiving log-on message, client device is registered.
In one embodiment, enquiry module, during specifically for roaming to the overlapping region of access point wireless coverage at client device, new access point is in the discovery procedure of client device, the facility information of the access controller copied is carried out alternately as the facility information of access point and client device, and inquires about this client device and whether register.
According to another aspect of the embodiment of the present invention, proposing a kind of access controller, comprising: preserving module, for preserving the log-on message of client device; Registration notification module, for the treatment of the whether chartered request of access point inquiring client terminal equipment, in response to the chartered Query Result of this client device, sends to access point by the log-on message of this client device; Communication selection module, for selecting the access point of the data forwarding client device, completes roaming.
In one embodiment, communication selection module, specifically for the quality of connection according to client device and access point, selects the access point of quality of connection optimum to forward the data of client device, completes roaming.
The present invention is when the access controller do not changed in current wlan network and access point architecture, the initiation of roaming and control are concentrated to access controller, and be responsible for execution by access point, at client device without the need to any action with without realizing level and smooth roaming when any perception, simplify roam procedure.
And, each access point all copies the facility information of access controller, and use the information copied to communicate with client device, therefore, at client device, intrasystem all access points are as broad as long, when client device is within the scope of multiple access point, all access points in scope all can receive the data of client device, access point can know the signal quality of itself and client device thus, access controller judges quality of connection according to the signal quality of client device and each access point, quality of connection according to client device and each access point selects optimum access point to forward the data of client device, the roaming that greatly can improve user is experienced.
Simultaneously, client device can add network by any one access point in system, and is registered to network, and access controller preserves the log-on message of client device, after this client device is without the need to again registering, and utilizes the log-on message preserved to complete roaming.
By referring to the detailed description of accompanying drawing to exemplary embodiment of the present invention, further feature of the present invention and advantage thereof will become clear.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
Fig. 1 is the schematic flow sheet of a WLAN of the present invention level and smooth loaming method embodiment.
Fig. 2 is the schematic flow sheet of level and smooth another embodiment of loaming method of WLAN of the present invention.
Fig. 3 is the structural representation of a WLAN of the present invention level and smooth roaming system embodiment.
Fig. 4 is the structural representation of an access point of the present invention embodiment.
Fig. 5 is the structural representation of an access controller of the present invention embodiment.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, be clearly and completely described the technical scheme in the embodiment of the present invention, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Illustrative to the description only actually of at least one exemplary embodiment below, never as any restriction to the present invention and application or use.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.
Determine whether start for existing WLAN roaming process by client device, roam procedure more complicated on the one hand, on the other hand when client device initiates Roaming Registration request, the problem that the wireless experience of user is poor, the present invention proposes the level and smooth roaming scenarios of a kind of new WLAN, when the access controller do not changed in current wlan network and access point architecture, the initiation of roaming and control are concentrated to access controller, and be responsible for execution by access point, at client device without the need to any action with without realizing level and smooth roaming when any perception.
Wlan system generally by AC(Access Controller, access controller) and AP(access point) composition.AP equipment is the wireless exchange board for wireless network, is also the core of wireless network.AP equipment is the access point that mobile computer user is with spider lines, is mainly used in broadband home, inside buildings and garden inside, and typical range covers tens meters to rice up to a hundred, and current major technique is 802.11 series.AC equipment is the access control equipment of WLAN (wireless local area network), is responsible for the data from different AP equipment to carry out converging and accessing Internet, also completes the configuration management of AP equipment, the certification of wireless user, management and the controlling functions such as broadband-access, safety in addition.
In the present invention, for the ease of distinguishing the diverse access point related in roam procedure, invention defines the first access point and the second access point, wherein first and second are not used for representing size and sequential, and are used to represent the diverse access point related in roam procedure.
Fig. 1 is the schematic flow sheet of a WLAN of the present invention level and smooth loaming method embodiment.As shown in Figure 1, the level and smooth loaming method of the WLAN of the present embodiment comprises the following steps:
S101, copies the facility information of access controller when each access point adds access controller.
Wherein, the facility information of access controller such as can comprise the MAC(Media Access Control of access controller, medium education) address, BSSID(BSSID can also be comprised) etc. information, but to be not limited thereto.
S102, in client device registration process, the first access point uses the facility information of the access controller copied to communicate with client device, and the log-on message of client device is sent to access controller.
The present embodiment hypothesis client device is joined in network by the first access point, and is registered by the first access point.Wherein, client device also can be called STA(station, website).
Wherein, a kind of exemplary implementation method that the first access point uses the facility information of the access controller copied and client device to carry out communicating is: the facility information of the access controller copied carries out alternately as the facility information of access point and client device by the first access point; The reception access-in point information of log-on message is set to the facility information of access controller by client device, and sends this log-on message to the first access point; The first access point receiving log-on message is registered client device.
Wherein, the log-on message of client device such as can comprise the information such as key.
S103, access controller preserves the log-on message of client device.
S104, when client device roams to the overlapping region of the first access point and the second access point wireless coverage, the second access point is in the discovery procedure of client device, whether the second access point uses the facility information of the access controller copied to communicate with client device, and inquire about this client device to access controller and register.
It should be noted that, the overlapping region of wireless coverage has two access points at least, the discovery of each access point is identical with the second access point with roam procedure, therefore, it will be appreciated by those skilled in the art that the present invention program is not limited to the situation of two access point wireless coverage overlaps, can expand to the situation of two or more access point wireless coverage overlap easily, such as, the second access point has multiple situations.
Wherein, a kind of exemplary implementation method that second access point uses the facility information of the access controller copied and client device to carry out communicating is: when client device roams to the overlapping region of the first access point and the second access point wireless coverage, the second access point is in the discovery procedure of client device, and the facility information of the access controller copied is informed client device by the second access point; The facility information of the access controller copied carries out alternately as the facility information of access point and client device by the second access point, and whether the second access point is inquired about this client device to access controller and registered.
S105, access controller is in response to the chartered Query Result of this client device, the log-on message of this client device is sent to the second access point, and make client device without the need to again registering, the log-on message utilizing access controller to preserve can complete roaming.
S106, access controller selects the access point of the data forwarding this client device, completes roaming.
Each access point all copies the facility information of access controller, and use the information copied to communicate with client device, therefore, at client device, intrasystem all access points are as broad as long, when client device is within the scope of multiple access point, all access points in scope all can receive the data of client device, access point can know the signal quality of itself and client device thus, and access controller judges quality of connection according to the signal quality of client device and each access point.Therefore, in one embodiment, access controller can select the access point of quality of connection optimum to forward the data of client device according to the quality of connection of client device and each access point, and the roaming that greatly can improve user is experienced.
Such as, if the quality of connection of the second access point and client device is better than the quality of connection of the first access point and client device, then access controller can select the second access point to forward the data of this client device.The data of client device broadcast can be received by all access points in wireless coverage, the data of client device such as all can be received at overlapping region first access point of wireless coverage and the second access point, but according to the selection of access controller, only have the second access point can forward the data of client device.
In order to make the present invention program clearly, enumerate the application example that a WLAN smoothly roams below.In the system of two AP, first STA has accessed AP1, and moves to the overlapping region of the wireless coverage of AP1, AP2 gradually in the coverage of AP1, and when the signal quality that AC perceives AP2 and STA is more excellent, AC starts and completes whole roam procedure.
Fig. 2 is the schematic flow sheet of level and smooth another embodiment of loaming method of WLAN of the present invention.As shown in Figure 2, the level and smooth loaming method of the WLAN of the present embodiment comprises the following steps:
When S201, AP add AC, the facility information of AC copies by AP.Such as, when AP1 and AP2 adds AC, the facility information of AC copies by AP1 and AP2.
S202, STA are first by a certain AP(such as AP1) add network, in STA registration process, AP1 uses the AC facility information copied to communicate with STA, and the log-on message of STA is sent to AC.
S203, AC preserve the log-on message of STA.
Now, AP1 and STA completes registration process, can proper communication.
At STA, S204, when STA roams to the overlapping region of AP1 and AP2 wireless coverage, finds that in AP2 process, AP2 uses the AC facility information copied to communicate with STA.
Whether S205, AP2 utilize the STA information found out, inquire about STA register in systems in which to AC.
S206, if STA registers in systems in which, the log-on message of STA is sent to AP2 by AC, completes the registration of STA.
S207, AC judge STA and AP1 and the quality of connection of AP2, when the quality of connection of AP2 and STA is more excellent, selects AP2 to carry out the data retransmission of STA, complete roaming.
Fig. 3 is the structural representation of a WLAN of the present invention level and smooth roaming system embodiment.
As shown in Figure 3, the level and smooth roaming system 30 of WLAN of the present embodiment comprises: access point 31 and access controller 32, and access point 31 comprises the first access point 311 and the second access point 312.It should be noted that, access point not only has two access points, may also have other access points.
The facility information of access controller is copied when access point 31 is for adding access controller;
In client device registration process, the first access point 311 communicates with client device for using the facility information of the access controller 32 copied, and the log-on message of client device is sent to access controller 32;
When client device roams to the overlapping region of the first access point 311 and the second access point 312 wireless coverage, the second access point is in the discovery procedure of client device, whether the second access point 312 communicates with client device for using the facility information of the access controller copied, and inquire about this client device to access controller and register;
Access controller 32, for preserving the log-on message of client device, in response to the chartered Query Result of this client device, the log-on message of this client device is sent to the second access point, and select the access point of the data forwarding this client device, complete roaming.
When the first access point 311 is for using the facility information of the access controller 32 copied to communicate with client device, first access point 311 carries out alternately for the facility information of access controller that will copy as the facility information of access point and client device, to make client device, the reception access-in point information of log-on message is set to the facility information of access controller, and send log-on message to the first access point, the first access point receiving log-on message is registered client device.
When client device roams to the overlapping region of the first access point and the second access point wireless coverage, the second access point is in the discovery procedure of client device, whether the second access point 312 carries out alternately as the facility information of access point and client device for the facility information of access controller that will copy, and inquire about this client device to access controller and register.
When access controller 32 selects the access point of the data forwarding this client device, specifically for the quality of connection according to client device and access point, the access point of quality of connection optimum is selected to forward the data of this client device.
Wherein, the facility information of access controller and the information included by the log-on message of client device with reference to previous embodiment, can repeat no more here.
Fig. 4 is the structural representation of an access point of the present invention embodiment.
As shown in Figure 4, the access point 31 of the present embodiment comprises:
Information reproduction module 41, for copying the facility information of access controller when access point adds access controller;
Registering modules 42, for in client device registration process, use the facility information of the access controller copied to communicate with client device, and the log-on message of client device is sent to access controller, so that access controller preserves the log-on message of client device;
Enquiry module 43, during for roaming to the overlapping region of access point wireless coverage at client device, new access point is in the discovery procedure of client device, the facility information of the access controller copied is used to communicate with client device, and inquire about this client device to access controller whether to register, so that the log-on message of this client device, in response to the chartered Query Result of this client device, is sent to new access point by access controller;
Forwarding module 44, for the selection according to access controller, forwards or abandons the data of this client device, complete roaming.
In one embodiment, Registering modules 42, carry out alternately specifically for the facility information of access controller that will copy as the facility information of access point and client device, so that the reception access-in point information of log-on message is set to the facility information of access controller by client device, and send log-on message to the first access point, after receiving log-on message, client device is registered.
In one embodiment, enquiry module 43, during specifically for roaming to the overlapping region of access point wireless coverage at client device, new access point is in the discovery procedure of client device, the facility information of the access controller copied is carried out alternately as the facility information of access point and client device, and inquires about this client device and whether register.
Wherein, the facility information of access controller and the information included by the log-on message of client device with reference to previous embodiment, can repeat no more here.
Relative to prior art, access point apparatus adds information reproduction module, is used for copying the facility information of AC, and uses the AC facility information copied to communicate with client device.Thus at client device, intrasystem all access points are as broad as long, when client device is within the scope of multiple access point, all access points in scope all can receive the data of client device, and access point can know the signal quality of itself and client device thus.
Fig. 5 is the structural representation of an access controller of the present invention embodiment.
As shown in Figure 5, the access controller 32 of the present embodiment comprises:
Preserve module 51, for preserving the log-on message of client device;
Registration notification module 52, for the treatment of the whether chartered request of access point inquiring client terminal equipment, in response to the chartered Query Result of this client device, sends to access point by the log-on message of this client device;
Communication selection module 53, for selecting the access point of the data forwarding client device, completes roaming.
In one embodiment, communication selection module 53, specifically for the quality of connection according to client device and access point, selects the access point of quality of connection optimum to forward the data of client device, completes roaming.
Wherein, the information included by the log-on message of client device with reference to previous embodiment, can repeat no more here.
Relative to prior art, access controller adds registration notification module and communication selection module, the log-on message of client device can be sent to the access point of inquiry by registration notification module, communication selection module can select the access point of the data forwarding client device, complete roaming, thus the initiation of roaming and control are concentrated to access controller.
One of ordinary skill in the art will appreciate that all or part of step realizing above-described embodiment can have been come by hardware, the hardware that also can carry out instruction relevant by program completes, described program can be stored in a kind of computer-readable recording medium, the above-mentioned storage medium mentioned can be read-only memory, disk or CD etc.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (20)
1. the level and smooth loaming method of WLAN, comprising:
Each access point copies the facility information of access controller when adding access controller;
In client device registration process, the first access point uses the facility information of the access controller copied to communicate with client device, and the log-on message of client device is sent to access controller;
Access controller preserves the log-on message of client device;
When client device roams to the overlapping region of the first access point and the second access point wireless coverage, the second access point is in the discovery procedure of client device, whether the second access point uses the facility information of the access controller copied to communicate with client device, and inquire about this client device to access controller and register;
The log-on message of this client device, in response to the chartered Query Result of this client device, is sent to the second access point by access controller;
Access controller selects the access point of the data forwarding this client device, completes roaming.
2. method according to claim 1, is characterized in that, in client device registration process, the first access point uses the facility information of the access controller copied to communicate with client device, comprising:
The facility information of the access controller copied carries out alternately as the facility information of access point and client device by the first access point;
The reception access-in point information of log-on message is set to the facility information of access controller by client device, and sends this log-on message to the first access point;
The first access point receiving log-on message is registered client device.
3. method according to claim 1, it is characterized in that, when client device roams to the overlapping region of the first access point and the second access point wireless coverage, the second access point is in the discovery procedure of client device, second access point uses the facility information of the access controller copied to communicate with client device, and inquire about this client device to access controller whether to register, comprising:
When client device roams to the overlapping region of the first access point and the second access point wireless coverage, the second access point is in the discovery procedure of client device, and the facility information of the access controller copied carries out alternately as the facility information of access point and client device by the second access point;
Whether the second access point is inquired about this client device to access controller and is registered.
4. the method according to any one of claim 1-3, is characterized in that, access controller selects the access point of the data forwarding this client device, completes roaming and comprises:
Access controller, according to the quality of connection of client device and access point, is selected the access point of quality of connection optimum to forward the data of this client device, is completed roaming.
5. the method according to any one of claim 1-3, is characterized in that, the facility information of access controller comprises the MAC Address of access controller.
6. the method according to any one of claim 1-3, is characterized in that, the log-on message of client device comprises key.
7. the level and smooth roaming system of WLAN, comprising: access point and access controller;
Copying the facility information of access controller when access point is for adding access controller, comprising the first access point and the second access point;
In client device registration process, the first access point communicates with client device for using the facility information of the access controller copied, and the log-on message of client device is sent to access controller;
When client device roams to the overlapping region of the first access point and the second access point wireless coverage, the second access point is in the discovery procedure of client device, whether the second access point communicates with client device for using the facility information of the access controller copied, and inquire about this client device to access controller and register;
Access controller, for preserving the log-on message of client device, in response to the chartered Query Result of this client device, the log-on message of this client device is sent to the second access point, select the access point of the data forwarding this client device, complete roaming.
8. system according to claim 7, is characterized in that,
First access point is used for the facility information of the access controller copied to carry out alternately as the facility information of access point and client device, to make client device, the reception access-in point information of log-on message is set to the facility information of access controller, and send log-on message to the first access point, the first access point receiving log-on message is registered client device.
9. system according to claim 7, is characterized in that,
When client device roams to the overlapping region of the first access point and the second access point wireless coverage, the second access point is in the discovery procedure of client device, whether the second access point is used for the facility information of the access controller copied to carry out alternately as the facility information of access point and client device, and inquire about this client device to access controller and register.
10. the system according to any one of claim 7-9, it is characterized in that, access controller is when selecting the access point of the data forwarding this client device, specifically for the quality of connection according to client device and access point, the access point of quality of connection optimum is selected to forward the data of this client device.
11. systems according to any one of claim 7-9, it is characterized in that, the facility information of access controller comprises the MAC Address of access controller.
12. systems according to any one of claim 7-9, it is characterized in that, the log-on message of client device comprises key.
13. 1 kinds of access points, comprising:
Information reproduction module, for copying the facility information of access controller when access point adds access controller;
Registering modules, for in client device registration process, use the facility information of the access controller copied to communicate with client device, and the log-on message of client device is sent to access controller, so that access controller preserves the log-on message of client device;
Enquiry module, during for roaming to the overlapping region of access point wireless coverage at client device, new access point is in the discovery procedure of client device, the facility information of the access controller copied is used to communicate with client device, and inquire about this client device to access controller whether to register, so that the log-on message of this client device, in response to the chartered Query Result of this client device, is sent to new access point by access controller;
Forwarding module, for the selection according to access controller, forwards or abandons the data of this client device, complete roaming.
14. access points according to claim 13, is characterized in that,
Registering modules, carry out alternately specifically for the facility information of access controller that will copy as the facility information of access point and client device, so that the reception access-in point information of log-on message is set to the facility information of access controller by client device, and send log-on message to the first access point, after receiving log-on message, client device is registered.
15. access points according to claim 13, is characterized in that,
Enquiry module, during specifically for roaming to the overlapping region of access point wireless coverage at client device, new access point is in the discovery procedure of client device, the facility information of the access controller copied is carried out alternately as the facility information of access point and client device, and inquires about this client device and whether register.
16. access points according to any one of claim 13-15, it is characterized in that, the facility information of access controller comprises the MAC Address of access controller.
17. access points according to any one of claim 13-15, it is characterized in that, the log-on message of client device comprises key.
18. 1 kinds of access controllers, comprising:
Preserve module, for preserving the log-on message of client device;
Registration notification module, for the treatment of the whether chartered request of access point inquiring client terminal equipment, in response to the chartered Query Result of this client device, sends to access point by the log-on message of this client device;
Communication selection module, for selecting the access point of the data forwarding client device, completes roaming.
19. access controllers according to claim 18, is characterized in that, communication selection module, specifically for the quality of connection according to client device and access point, select the access point of quality of connection optimum to forward the data of client device, complete roaming.
20. access controllers according to claim 18, is characterized in that, the log-on message of client device comprises key.
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