CN101938745B - Roaming handover method and device thereof - Google Patents
Roaming handover method and device thereof Download PDFInfo
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- CN101938745B CN101938745B CN201010290053.3A CN201010290053A CN101938745B CN 101938745 B CN101938745 B CN 101938745B CN 201010290053 A CN201010290053 A CN 201010290053A CN 101938745 B CN101938745 B CN 101938745B
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Abstract
The invention discloses a roaming handover method and a device thereof. The method includes that: a wireless client sends a probe request message to an AP to be changed over; the AP to be changed over searches whether a home AC records a private key corresponding to private key ID or not according to the private key ID; if yes, the AP to be changed over sends a probe response message containing the private key ID to the wireless client; if not, the AP to be changed over sends a probe response message not containing the private key ID to the wireless client; and the wireless client preferentially carries out changing-over on the AP which is required to be changed over and is corresponding to the probe response message carrying the private key ID. The invention effectively reduces delay of station in changing-over process, and continuity of network service flow on station is ensured.
Description
Technical field
The present invention relates to communication technical field, particularly relate to a kind of method and apparatus of roaming switch.
Background technology
WLAN (Wireless Local Area Networks, WLAN (wireless local area network)) provide a kind of wireless connection service of local area network (LAN), wireless data access at a high speed can be provided, compare with traditional Wired access mode, WLAN (wireless local area network) makes the use of network freer, thoroughly break away from the constraint of cable and port position, and WLAN (wireless local area network) has and is easy to carry, be easy to the advantage of movement, remove from or decrease numerous and diverse network layout, only need to lay one or more AP (Access Point, access point) equipment just can set up the LAN covering whole building or area.Wherein, in a wireless local area network, AC (Access Controller, wireless controller) is for carrying out control and management to the AP in WLAN (wireless local area network).
When a Station (wireless client) roams into the AP in another AC from the AP in an AC, show that this wireless client there occurs roaming between AC.In the process of AC internetwork roaming, can by using IACTP (Inter Access Controller Tunneling Protocol, tunnel protocol between access controller) realize between AC and AC communication, this IACTP provides generic encapsulation between AC and transmission mechanism, ensure that the safe transmission between AC.
As shown in Figure 1, a roaming group is constituted, when a Station first time is associated with any one AC (such as, the AC1) in this roaming group between AC1 and AC2, this Station and this AC1 will hold consultation by using 11Key key, and the AP1 corresponding with AC1 connects.After having consulted, the information of Station has been carried out synchronously by AC1 in roaming group, and namely AC1 needs the message notice of Station to AC2.When Station roams into AP2 by AP1, then Station there occurs and roams across AC between AC1 and AC2, now owing to saving the information of Station in AC2 in advance, then Station can use this information directly and AC2 hold consultation, namely AC2 can the information of rapid authentication Station, thus in roaming group, realize the roam procedure of this Station.
Concrete, Station and AC1 holds consultation, and comprises with the process that AP1 connects: (1) Station and AC1 carries out link negotiation; (2) Station initiates 802.1X verification process to AC1; (3) after certification is passed through, the key (802.1X authenticate key) that Station obtains according to 802.1X certification, 4 handshake procedures are carried out with AC1, and session key generation is (according to the master key of 802.1X certification, the reciprocal process that can be regularly shaken hands by 4 times generates the temporary key of short-term, to ensure the continuous change of netkey); After certification is passed through, Station uses above-mentioned session key to communicate with AP1.
At AC1 the information of Station carried out in roaming group synchronous, and by the message notice of Station to AC2 time, comprise the 802.1X authenticate key of Station in the information of this Station, preserve 802.1X authenticate key by this AC2.
Therefore, as AP2 under Station roams into AC2, the process that this Station holds consultation with AC2 again comprises: (1) Station and AC2 carries out link negotiation; (2) the 802.1X authenticate key preserved according to AC2 of Station, carries out 4 handshake procedures with AC2, and session key generation.
Visible, when Station roams across AC, if stored 802.1X authenticate key in AC2, then Station has not needed to carry out 802.1X verification process, significantly reduces negotiation time, namely can carry out fast roaming to Station.
In prior art, Station is from AP1 to before AP2 switches, and do not know whether AC2 have recorded the 802.1X authenticate key of Station, only have when Station initiates to connect to AP2, just can know whether AC2 have recorded 802.1X authenticate key, if having recorded 802.1X authenticate key, then not need to carry out 802.1X verification process when Station and AP2 connects, if do not record 802.1x authenticate key, then need to carry out 802.1X verification process when Station and AP2 connects.
As can be seen here, whether Station can carry out fast roaming (namely omitting 802.1X verification process), will depend on the process that Station and AP2 connects.
But, when there is roaming switch in Station, often there is multiple AP that can select to switch, such as, Station can from the AP2 AP1 is switched to AC2, also can be switched to the AP3 under AC3, this Station generation association before and do not know self to need to be switched on which AP, this Station can switch by Stochastic choice AP.
If have recorded 802.1X authenticate key in AC2,802.1X authenticate key is not recorded in AC3, fast roaming can be carried out when then Station is switched to AP2, fast roaming can not be carried out when being switched to AP3, need to re-start 802.1X verification process, and in practical application, the probability that Station selects AP2 to carry out switching is only 50%, namely Station can carry out the probability of fast roaming switching is 50%, when being switched to AP3, need to re-execute 802.1X verification process, the use sense that significantly affects user is subject to.
Summary of the invention
The invention provides a kind of method and apparatus of roaming switch, the AP that can carry out fast roaming with prioritizing selection switches, and improves the probability carrying out fast roaming switching.
In order to achieve the above object, the present invention proposes a kind of method of roaming switch, be applied in the system comprising wireless client, at least two AC equipment, AP equipment that described at least two AC equipment are corresponding, the method comprises the following steps:
When knowing that self needs switches, described wireless client sends probe request message at least one to be switched AP, carries the key ID of described wireless client in described probe request message;
Described to be switched AP searches in AC equipment belonging to self whether record key corresponding to described key ID according to described key ID;
If so, described to be switched AP sends the probe response message of carrying described key ID to described wireless client; If not, described to be switched AP sends the probe response message of not carrying described key ID to described wireless client;
Described wireless client prioritizing selection initiates handoff procedure to the to be switched AP that the probe response message of carrying described key ID is corresponding.
Described to be switched AP searches in AC equipment belonging to self whether record key corresponding to described key ID according to described key ID, also comprises before:
Described key ID and key notification corresponding to described key ID are given other AC equipment in same roaming territory by AC equipment belonging to the current AP equipment of described wireless client.
Described wireless client prioritizing selection initiates handoff procedure to the to be switched AP that the probe response message of carrying described key ID is corresponding, specifically comprises:
When carrying described key ID in the probe response message having to be switched AP to return in each to be switched AP, described wireless client initiates handoff procedure to the to be switched AP that the probe response message of carrying described key ID is corresponding; Or,
When all not carrying described key ID in the probe response message that each to be switched AP returns, described wireless client selects a to be switched AP wherein to initiate handoff procedure according to default switchover policy.
Described wireless client initiates handoff procedure to the to be switched AP that the probe response message of carrying described key ID is corresponding, comprising:
Described wireless client sends association request message to described to be switched AP, carries described key ID in described association request message;
Described to be switched AP searches in AC equipment belonging to self according to described key ID and records key corresponding to described key ID; And receive the response to the association that described key ID is carried in described wireless client transmission;
When receiving the association of carrying described key ID and receiveing the response, described wireless client carries out roam procedure.
A kind of wireless client, be applied in the system comprising described wireless client, at least two AC equipment, AP equipment that described at least two AC equipment are corresponding, this wireless client comprises:
Sending module, for when knowing that self needs switches, sending probe request message at least one to be switched AP, carrying the key ID of described wireless client in described probe request message; Search in AC equipment belonging to self whether record key corresponding to described key ID for described to be switched AP according to described key ID;
Receiver module, for receiving the probe response message from described to be switched AP; When recording key corresponding to described key ID in AC equipment belonging to described to be switched AP, described key ID is carried in described probe response message, when not recording key corresponding to described key ID in AC equipment belonging to described to be switched AP, in described probe response message, do not carry described key ID;
Processing module, initiates handoff procedure for prioritizing selection to the to be switched AP that the probe response message of carrying described key ID is corresponding.
The key that the described key ID recorded in AC equipment belonging to described to be switched AP is corresponding, is specially:
AC equipment belonging to the current AP equipment of described wireless client informs key corresponding to the described key ID of other AC equipment in same roaming territory.
Described processing module, specifically for when carrying described key ID in the probe response message having to be switched AP to return in each to be switched AP, the to be switched AP corresponding to the probe response message of carrying described key ID initiates handoff procedure; Or,
When all not carrying described key ID in the probe response message that each to be switched AP returns, a to be switched AP is wherein selected to initiate handoff procedure according to default switchover policy.
Described processing module, is further used for sending association request message to described to be switched AP, carries described key ID in described association request message; To search in AC equipment belonging to self according to described key ID for described to be switched AP and record key corresponding to described key ID;
And reception is receiveed the response from the association carrying described key ID of described to be switched AP; Carry out roam procedure.
A kind of AP equipment, be applied in the system comprising wireless client, at least two AC equipment, AP equipment that described at least two AC equipment are corresponding, this AP equipment comprises:
Receiver module, for receiving the probe request message from described wireless client, carries the key ID of described wireless client in described probe request message;
Whether judge module, record key corresponding to described key ID for searching in AC equipment belonging to self according to described key ID;
Sending module, for when the key having described key ID corresponding, sends the probe response message of carrying described key ID to described wireless client; When the key not having described key ID corresponding, send the probe response message of not carrying described key ID to described wireless client; Handoff procedure is initiated to the AP that the probe response message of carrying described key ID is corresponding for described wireless client prioritizing selection.
Described receiver module, also for receiving the association request message from described wireless client, carries described key ID in described association request message;
Described judge module, also records key corresponding to described key ID for searching in AC equipment belonging to self according to described key ID;
Described sending module, also receives the response for sending the association of carrying described key ID to described wireless client; Roam procedure is carried out for described wireless client.
Compared with prior art, the present invention at least has the following advantages:
Before Station carries out roaming switch, whether fast roaming can be supported by the to be switched AP of sensed in advance, and the AP that prioritizing selection can carry out fast roaming switches, improve the probability that fast roaming occurs Station, effectively reduce Station time delay in the handover, and ensure that the continuity of network service traffic on Station.
Accompanying drawing explanation
Fig. 1 is the networking schematic diagram of roaming group of the prior art;
Fig. 2 is the application scenarios schematic diagram proposed in the present invention;
Fig. 3 is the method flow diagram of a kind of roaming switch provided under a kind of application scenarios of the present invention;
Fig. 4 is the structure chart of the wireless client proposed in the present invention;
Fig. 5 is the structure chart of the AP equipment proposed in the present invention.
Embodiment
In the present invention, before Station carries out roaming switch, Station is by sending the probe request message of carrying key ID to be switched AP, to determine whether to be switched AP can support fast roaming, and the AP that prioritizing selection can carry out fast roaming switches, thus improve the probability that fast roaming occurs Station, effectively reduce Station time delay in the handover, and ensure that the continuity of network service traffic on Station.
Be described in detail below in conjunction with the method for the application scenarios shown in Fig. 2 to roaming switch provided by the invention.In fig. 2, suppose that AC1 and AC2 is the AC equipment in same roaming territory, AC1 and AC3 is not the AC equipment in same roaming territory; The AC equipment AC equipment belonging to AC2, AP3 belonging to AC1, AP2 of AC equipment belonging to AP1 is AC3.
As shown in Figure 3, based on above-mentioned application scenarios, the method for roaming switch provided by the invention comprises the following steps:
Step 301, Station and AC holds consultation, and is connected to corresponding AP.
Time under this application scene with Station first connection AP, being connected to AP1 is that example is described, and therefore, Station needs to hold consultation with AC1.
In this step, when Station and AC1 holds consultation, AC1 can obtain information corresponding to Station, and this information includes but not limited to the IP address information, MAC (Media Access Control, medium access control) address information etc. of key, Station.Wherein, the key of different verification process can be selected according to actual conditions, and such as, when Station carries out 802.1X certification, then this key is 802.1X authenticate key, is described under this application scene for 802.1X authenticate key.
In actual applications, a key ID that each 802.1X authenticate key is corresponding, by this key ID, namely can find corresponding 802.1X authenticate key.
Step 302, Station and AP1 communicates.
When being connected to AP1, Station is current can communicate with AP1, and namely the current AP of Station is AP1.
Step 303, Station determines self to need to switch.
Concrete, Station is by monitoring signal strength signal intensity around, if find that (can select according to practical experience by this first threshold lower than preset first threshold value for the signal strength signal intensity of current AP, as long as make signal strength signal intensity need to switch out AP corresponding to this first threshold lower than Station during this first threshold), and the signal strength signal intensity of other to be switched AP is higher than default Second Threshold, and (this Second Threshold can be selected according to practical experience, as long as make signal strength signal intensity can be switched to AP corresponding to this Second Threshold higher than Station during this Second Threshold) time, then determine self to need to switch.
Such as, under this application scene, by monitoring signal strength signal intensity around, the signal strength signal intensity that Station perceives the AP1 of current connection progressively weakens (signal strength signal intensity is lower than first threshold), the signal strength signal intensity of AP2 and AP3 of periphery strengthens (signal strength signal intensity is higher than Second Threshold) simultaneously, then illustrate that Station needs to carry out the switching between different AP, and AC equipment AC equipment AC equipment belonging to AC2, AP3 belonging to AC1, AP2 is AC3 belonging to AP1, then illustrate that Station needs to carry out the switching between different AC equipment.
Step 304, Station sends probe request message to be switched AP, carries the key ID of this Station in this probe request message.Wherein, this probe request message can be the Proberequest message in 802.11 agreements.
When Station can switch from AP1 to AP2 and AP3, then can using AP2 and AP3 as to be switched AP.Under this application scene, when Station is switched to AP2 or AP3 from AP1, Station needs to send probe request message to AP2 and AP3.
Further, when Station and AC1 holds consultation, Station can know the 802.1X authenticate key of self correspondence, and the key ID that this 802.1X authenticate key is corresponding, when sending probe request message to be switched AP, need to carry this key ID in this probe request message.
In this step, the mode that Station sends probe request message to be switched AP includes but not limited to: Station sends the probe request message of carrying key ID respectively to AP2 and AP3; Or Station sends the probe request message of carrying key ID to AP2 and AP3 with broadcast mode.
Step 305, to be switched AP searches in AC equipment belonging to self whether record 802.1X authenticate key corresponding to this key ID according to key ID.If record this 802.1X authenticate key, forward step 306 to, otherwise, forward step 307 to.
Wherein, when AP2 receives the probe request message carrying key ID, need to search in AC2 whether record 802.1X authenticate key corresponding to this key ID according to this key ID; When AP3 receives the probe request message carrying key ID, need to search in AC3 whether record 802.1X authenticate key corresponding to this key ID according to this key ID.
Concrete, after negotiations process in step 301 completes, AC1 can by IACTP by the information of this Station (such as, the 802.1X authenticate key of this Station, corresponding key ID) share in this roaming group, for the AC2 in roaming group, after receiving the information of this Station, the 802.1X authenticate key of this Station and the key ID of correspondence can be got.And for not being AC3 in roaming group, the information of this Station cannot being received, namely in AC3, do not record the 802.1X authenticate key of this Station and the key ID of correspondence.
Certainly, in actual applications, the mode that AC2 or AC3 obtains the 802.1X authenticate key of Station and the key ID of correspondence is not limited to AC1 and shares in roaming group.Such as, the 802.1X authenticate key of Station and the key ID of correspondence are initiatively informed to AC3 by AC1, and do not share in roaming group.Now, the 802.1X authenticate key of Station and the key ID of correspondence in AC3, can be recorded, in AC2, not record the 802.1X authenticate key of Station and the key ID of correspondence.For convenience of description, be described for the information of AC1 shared Station in roaming group under this application scene.
Therefore, under this application scene, in AC2, record the 802.1X authenticate key of this Station and the key ID of correspondence, in AC3, do not record the 802.1X authenticate key of this Station and the key ID of correspondence.Namely AP2 searches in AC2 and records 802.1X authenticate key corresponding to this key ID, forwards step 306 to, and AP3 searches in AC3 and do not record 802.1X authenticate key corresponding to this key ID, forwards step 307 to.
Step 306, to be switched AP sends the probe response message of carrying key ID to Station.
Under this application scene, AP2 sends the probe response message of carrying this key ID to Station, this probe response message can be Probe response message.
Step 307, to be switched AP sends the probe response message of not carrying key ID to wireless client.
Under this application scene, AP3 sends the probe response message of not carrying this key ID to Station.
Step 308, Station prioritizing selection initiates handoff procedure to the to be switched AP that the probe response message of carrying key ID is corresponding.
Concrete, when there being the to be switched AP carrying key ID in the probe response message that each to be switched AP returns, then wireless client initiates handoff procedure to the to be switched AP that the probe response message of carrying key ID is corresponding; Or, when all not carrying key ID in the probe response message that each to be switched AP returns, wireless client selects a to be switched AP wherein to initiate handoff procedure (such as according to default switchover policy, when default switchover policy is the height of signal strength signal intensity, then can initiate handoff procedure to the to be switched AP that signal strength signal intensity is higher).
Under this application scene, if when AP2 and AP3 all carries key ID to the probe response message that Station sends, then Station can select arbitrarily an AP in AP2 and AP3 to initiate handoff procedure; Such as, the to be switched AP that Station selects signal strength signal intensity higher initiates handoff procedure;
If when AP2 and AP3 does not all carry key ID to the probe response message that Station sends, then Station can select arbitrarily an AP in AP2 and AP3 to initiate handoff procedure; Such as, the to be switched AP that Station selects signal strength signal intensity higher initiates handoff procedure;
If carry key ID in the probe response message that AP2 sends to Station, and do not carry key ID in the probe response message that sends to Station of AP3, then Station selects AP2 to initiate handoff procedure.
Under this application scene, Station selects AP2 to initiate handoff procedure, specifically comprises:
(1) Station initiates association request, and namely Station sends association request (Association Request) message to AP2, carries the key ID of 802.1X authenticate key in this association request message.
(2) AP2 searches corresponding 802.1X authenticate key by key ID.Due in above-mentioned steps, determined the 802.1X authenticate key recording key ID and correspondence in the AC2 belonging to AP2, then AP2 can find corresponding 802.1X authenticate key by key ID.
(3) AP2 sends association to Station and responds (Association Response) message, and this association carries this key ID in receiveing the response.
(4) Station receives after association receives the response, if find that association carries key ID in receiveing the response, then directly carries out (roaming) process of shaking hands for 4 times.
It should be noted that, when sending association to Station and receiveing the response, if do not record the 802.1X authenticate key of key ID and correspondence in AC2, then association will not carry this key ID in receiveing the response, Station receives after association receives the response, find that association does not carry key ID in receiveing the response, need to carry out 802.1X verification process, certification just can carry out 4 handshake procedures by rear.
In summary it can be seen, in the present invention, before Station carries out roaming switch, by sending the probe request message of carrying key ID to be switched AP, determine whether to be switched AP can support fast roaming, and the AP that prioritizing selection can carry out fast roaming switches, with when switching to AP, this AP can be made to support fast roaming, Station receives after association receives the response, can directly carry out 4 handshake procedures, no longer need to carry out 802.1X verification process, significantly reduce Station time delay in the handover, and ensure that the continuity of network service traffic on Station.
Based on the inventive concept same with said method, the invention allows for a kind of wireless client, be applied in the system comprising described wireless client, at least two AC equipment, AP equipment that described at least two AC equipment are corresponding, as shown in Figure 4, this wireless client comprises:
Sending module 11, for when knowing that self needs switches, sending probe request message to be switched AP, carrying the key ID of described wireless client in described probe request message; Search in AC equipment belonging to self whether record key corresponding to described key ID for described to be switched AP according to described key ID;
Receiver module 12, for receiving the probe response message from described to be switched AP; When recording key corresponding to described key ID in AC equipment belonging to described to be switched AP, described key ID is carried in described probe response message, when not recording key corresponding to described key ID in AC equipment belonging to described to be switched AP, in described probe response message, do not carry described key ID;
Processing module 13 initiates handoff procedure for prioritizing selection to the to be switched AP that the probe response message of carrying described key ID is corresponding.
The key that the described key ID recorded in AC equipment belonging to described to be switched AP is corresponding, is specially:
AC equipment belonging to the current AP equipment of described wireless client informs key corresponding to the described key ID of other AC equipment in same roaming territory.
Described processing module 13, specifically for when carrying described key ID in the probe response message having to be switched AP to return in each to be switched AP, the to be switched AP corresponding to the probe response message of carrying described key ID initiates handoff procedure; Or,
When all not carrying described key ID in the probe response message that each to be switched AP returns, a to be switched AP is wherein selected to initiate handoff procedure according to default switchover policy.
Described processing module 13, is further used for sending association request message to described to be switched AP, carries described key ID in described association request message; To search in AC equipment belonging to self according to described key ID for described to be switched AP and record key corresponding to described key ID;
And reception is receiveed the response from the association carrying described key ID of described to be switched AP; Carry out roam procedure.
Wherein, the modules of apparatus of the present invention can be integrated in one, and also can be separated deployment.Above-mentioned module can merge into a module, also can split into multiple submodule further.
Based on the inventive concept same with said method, the invention allows for a kind of AP equipment, be applied in the system comprising wireless client, at least two AC equipment, AP equipment that described at least two AC equipment are corresponding, as shown in Figure 5, this AP equipment comprises:
Receiver module 21, for receiving the probe request message from described wireless client, carries the key ID of described wireless client in described probe request message;
Whether judge module 22, record key corresponding to described key ID for searching in AC equipment belonging to self according to described key ID;
Sending module 23, for when the key having described key ID corresponding, sends the probe response message of carrying described key ID to described wireless client; When the key not having described key ID corresponding, send the probe response message of not carrying described key ID to described wireless client; Handoff procedure is initiated to the AP that the probe response message of carrying described key ID is corresponding for described wireless client prioritizing selection.
The key that the described key ID recorded in AC equipment belonging to described to be switched AP is corresponding, is specially:
AC equipment belonging to the current AP equipment of described wireless client informs key corresponding to the described key ID of other AC equipment in same roaming territory.
Described receiver module 21, also for receiving the association request message from described wireless client, carries described key ID in described association request message;
Described judge module 22, also records key corresponding to described key ID for searching in AC equipment belonging to self according to described key ID;
Described sending module 23, also receives the response for sending the association of carrying described key ID to described wireless client; Roam procedure is carried out for described wireless client.
Wherein, the modules of apparatus of the present invention can be integrated in one, and also can be separated deployment.Above-mentioned module can merge into a module, also can split into multiple submodule further.
Through the above description of the embodiments, those skilled in the art can be well understood to the present invention can by hardware implementing, and the mode that also can add necessary general hardware platform by software realizes.Based on such understanding, technical scheme of the present invention can embody with the form of software product, it (can be CD-ROM that this software product can be stored in a non-volatile memory medium, USB flash disk, portable hard drive etc.) in, comprise some instructions and perform method described in each embodiment of the present invention in order to make a computer equipment (can be personal computer, server, or the network equipment etc.).
It will be appreciated by those skilled in the art that accompanying drawing is the schematic diagram of a preferred embodiment, the module in accompanying drawing or flow process might not be that enforcement the present invention is necessary.
It will be appreciated by those skilled in the art that the module in the device in embodiment can carry out being distributed in the device of embodiment according to embodiment description, also can carry out respective change and be arranged in the one or more devices being different from the present embodiment.The module of above-described embodiment can merge into a module, also can split into multiple submodule further.
The invention described above sequence number, just to describing, does not represent the quality of embodiment.
Be only several specific embodiment of the present invention above, but the present invention is not limited thereto, the changes that any person skilled in the art can think of all should fall into protection scope of the present invention.
Claims (10)
1. a method for roaming switch, be applied in the wlan system comprising wireless client, at least two wireless controller AC equipment, access point AP equipment that described at least two AC equipment are corresponding, it is characterized in that, the method comprises the following steps:
When knowing that self needs switches, described wireless client sends probe request message at least one to be switched AP, carries the key ID of described wireless client in described probe request message;
Described to be switched AP searches in AC equipment belonging to self whether record key corresponding to described key ID according to described key ID;
If so, described to be switched AP sends the probe response message of carrying described key ID to described wireless client; If not, described to be switched AP sends the probe response message of not carrying described key ID to described wireless client;
Described wireless client prioritizing selection initiates handoff procedure to the to be switched AP that the probe response message of carrying described key ID is corresponding.
2. the method for claim 1, is characterized in that, described to be switched AP searches in AC equipment belonging to self whether record key corresponding to described key ID according to described key ID, also comprises before:
Described key ID and key notification corresponding to described key ID are given other AC equipment in same roaming territory by AC equipment belonging to the current AP equipment of described wireless client.
3. the method for claim 1, is characterized in that, described wireless client prioritizing selection initiates handoff procedure to the to be switched AP that the probe response message of carrying described key ID is corresponding, specifically comprises:
When carrying described key ID in the probe response message having to be switched AP to return in each to be switched AP, described wireless client initiates handoff procedure to the to be switched AP that the probe response message of carrying described key ID is corresponding; Or,
When all not carrying described key ID in the probe response message that each to be switched AP returns, described wireless client selects a to be switched AP wherein to initiate handoff procedure according to default switchover policy.
4. method as claimed in claim 3, is characterized in that, described wireless client initiates handoff procedure to the to be switched AP that the probe response message of carrying described key ID is corresponding, comprising:
Described wireless client sends association request message to described to be switched AP, carries described key ID in described association request message;
Described to be switched AP searches in AC equipment belonging to self according to described key ID and records key corresponding to described key ID; And receive the response to the association that described key ID is carried in described wireless client transmission;
When receiving the association of carrying described key ID and receiveing the response, described wireless client carries out roam procedure.
5. a wireless client, be applied in the wlan system comprising described wireless client, at least two AC equipment, AP equipment that described at least two AC equipment are corresponding, it is characterized in that, this wireless client comprises:
Sending module, for when knowing that self needs switches, sending probe request message at least one to be switched AP, carrying the key ID of described wireless client in described probe request message; Search in AC equipment belonging to self whether record key corresponding to described key ID for described to be switched AP according to described key ID;
Receiver module, for receiving the probe response message from described to be switched AP; When recording key corresponding to described key ID in AC equipment belonging to described to be switched AP, described key ID is carried in described probe response message, when not recording key corresponding to described key ID in AC equipment belonging to described to be switched AP, in described probe response message, do not carry described key ID;
Processing module, initiates handoff procedure for prioritizing selection to the to be switched AP that the probe response message of carrying described key ID is corresponding.
6. wireless client as claimed in claim 5, is characterized in that the key that the described key ID recorded in AC equipment belonging to described to be switched AP is corresponding is specially:
AC equipment belonging to the current AP equipment of described wireless client informs key corresponding to the described key ID of other AC equipment in same roaming territory.
7. wireless client as claimed in claim 5, is characterized in that,
Described processing module, specifically for when carrying described key ID in the probe response message having to be switched AP to return in each to be switched AP, the to be switched AP corresponding to the probe response message of carrying described key ID initiates handoff procedure; Or,
When all not carrying described key ID in the probe response message that each to be switched AP returns, a to be switched AP is wherein selected to initiate handoff procedure according to default switchover policy.
8. wireless client as claimed in claim 7, is characterized in that,
Described processing module, is further used for sending association request message to described to be switched AP, carries described key ID in described association request message; To search in AC equipment belonging to self according to described key ID for described to be switched AP and record key corresponding to described key ID;
And reception is receiveed the response from the association carrying described key ID of described to be switched AP; Carry out roam procedure.
9. an AP equipment, be applied in the wlan system comprising wireless client, at least two AC equipment, AP equipment that described at least two AC equipment are corresponding, it is characterized in that, this AP equipment comprises:
Receiver module, for receiving the probe request message from described wireless client, carries the key ID of described wireless client in described probe request message;
Whether judge module, record key corresponding to described key ID for searching in AC equipment belonging to self according to described key ID;
Sending module, for when the key having described key ID corresponding, sends the probe response message of carrying described key ID to described wireless client; When the key not having described key ID corresponding, send the probe response message of not carrying described key ID to described wireless client; Handoff procedure is initiated to the AP that the probe response message of carrying described key ID is corresponding for described wireless client prioritizing selection.
10. AP equipment as claimed in claim 9, is characterized in that,
Described receiver module, also for receiving the association request message from described wireless client, carries described key ID in described association request message;
Described judge module, also records key corresponding to described key ID for searching in AC equipment belonging to self according to described key ID;
Described sending module, also receives the response for sending the association of carrying described key ID to described wireless client; Roam procedure is carried out for described wireless client.
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| CN102256250A (en) * | 2011-07-08 | 2011-11-23 | 杭州华三通信技术有限公司 | Wireless terminal information synchronization method in wireless local area network and equipment thereof |
| CN103686890B (en) * | 2012-09-07 | 2016-12-28 | 中兴通讯股份有限公司 | The method and system of wireless local network wireless terminal roaming switching |
| CN103945434B (en) * | 2013-01-22 | 2019-03-19 | 新华三技术有限公司 | Promote the method and device of terminal roaming in a kind of wlan network |
| CN103747494B (en) * | 2013-12-31 | 2017-01-25 | 上海华为技术有限公司 | Switching method and switching device in WLAN (Wireless Local Area Network) |
| CN105101152B (en) * | 2014-05-15 | 2018-11-16 | 华为技术有限公司 | Loaming method and relevant apparatus of the wireless terminal between wireless controller |
| CN106792687B (en) * | 2016-12-14 | 2020-10-30 | 上海斐讯数据通信技术有限公司 | Connection method and system of WIFI network of mobile terminal |
| FR3071990B1 (en) * | 2017-09-29 | 2019-10-04 | Sagemcom Broadband Sas | METHOD FOR AIDING A MOBILE TERMINAL SWITCH BETWEEN COMMUNITY WIRELESS LOCAL NETWORKS |
| JP6719525B2 (en) * | 2018-09-26 | 2020-07-08 | 三菱電機株式会社 | Mobile communication system |
| CN111726842B (en) * | 2020-05-14 | 2023-03-03 | 深圳互由科技有限公司 | Roaming switching method, electronic device and computer readable storage medium |
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| CN101212798A (en) * | 2006-12-26 | 2008-07-02 | 中兴通讯股份有限公司 | Pre-authentication process that supports quick switching |
| CN101801051A (en) * | 2010-03-04 | 2010-08-11 | 杭州华三通信技术有限公司 | Method and equipment for selecting access points (APs) |
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| CN101212798A (en) * | 2006-12-26 | 2008-07-02 | 中兴通讯股份有限公司 | Pre-authentication process that supports quick switching |
| CN101801051A (en) * | 2010-03-04 | 2010-08-11 | 杭州华三通信技术有限公司 | Method and equipment for selecting access points (APs) |
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