CN101448291A - Method, terminal and system for wireless local area network roaming switch - Google Patents
Method, terminal and system for wireless local area network roaming switch Download PDFInfo
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- CN101448291A CN101448291A CNA2008102473150A CN200810247315A CN101448291A CN 101448291 A CN101448291 A CN 101448291A CN A2008102473150 A CNA2008102473150 A CN A2008102473150A CN 200810247315 A CN200810247315 A CN 200810247315A CN 101448291 A CN101448291 A CN 101448291A
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Abstract
The invention discloses a method, a terminal and a system for wireless local area network roaming switch. In order to solve the problem that the host roaming switch time delay of a mobile host is long, the method comprises the following steps: when a mobile host searches access points of adjacent cells during the process of access point finding of the mobile host, the mobile host only scans the channel frequency of the access points of all the adjacent cells, searches the channel frequency of the access points of the adjacent cells, and performs cell switch according to the searched channel frequency of the access points of the adjacent cells, because the mobile host only scans the channel frequency of the access points of all the adjacent cells, the roaming switch time delay of the mobile host becomes short.
Description
Technical field
The invention belongs to wireless communication technology field, particularly a kind of method, terminal and system that realizes that the wireless local network roaming switches.
Background technology
According to IEEE 802.11 protocol specifications, the switching of mobile host (MH) mainly contains three phases, promptly finds access point (AP) stage, authentication phase and association phase again, and each stage all produces certain switching delay.
Phase I, MH had dual mode that AP is searched for, i.e. active searching and passive search in order to find the AP stage (Probe).When losing for a certain reason, MH just initiates the active searching pattern when being lower than its predefined critical value with the contact of former AP or the signal to noise ratio of receiving the AP signal; On the contrary, AP also regularly sends the existence of beacon (Beacon) signal indicating oneself, finds that when MH receives this signal its signal strength signal intensity is higher than the AP that is connecting at present, and this situation is passive search pattern.In both cases, MH just initiates (Initialize) handoff procedure.
Second stage is authentication (Authenticate), has only by just carrying out the mutual of network after authenticating.Present business-like WLAN has special aaa server, and functions such as authentication, charging and account management are provided, and verification process is that at first AP sends to certificate server to the authentication request of MH, and server sends to AP to the MH relevant information through authentication.Generally speaking, P is far for the aaa server distance A, if each the switching time, the authentication processing process is all passed through aaa server, certainly will increase the delay of switching.Thereby be not very general based on the method for certificate server, a lot of users do not wish to increase new network entity in oneself network, only require this process of execution between MH and AP.
Again related (Re-Associate) after first two steps are passed through, just advances the transmission that the people reconnects stage continuation data.
The discovery time delay of phase I (Probe Delay) is the part of proportion maximum in the whole handover delay.As shown in Figure 1, MH is finding that the AP stage is to adopt channel frequency scanning mode one by one, and promptly MH sends the request of discovery to AP one by one on all channel frequency Channel1-Channel N, and waits for the discovery response of AP, and MH roaming handover delay is bigger.
Summary of the invention
In order to solve the bigger problem of MH roaming handover delay, the embodiment of the invention provides a kind of method that realizes that the wireless local network roaming switches, and comprising:
Mobile host is in the discovery access point stage that roaming is switched, and when adjacent sub-district access point was searched for, mobile host only scanned the channel frequency of all adjacent sub-district access points, searches for the channel frequency of adjacent sub-district access point;
Mobile host carries out the sub-district switching according to the channel frequency of the adjacent sub-district access point that searches.
The embodiment of the invention also provides a kind of mobile host simultaneously, comprising:
Determination module: be used in the discovery access point stage of roaming switching, when adjacent sub-district access point was searched for, only the channel frequency to all adjacent sub-district access points scanned, and searches for the channel frequency of adjacent sub-district access point;
Handover module: be used for carrying out the sub-district switching according to the channel frequency of the adjacent sub-district access point that searches.
The embodiment of the invention also provides a kind of WLAN (wireless local area network) simultaneously, comprises that mobile host, a mobile host switch preceding sub-district access point and adjacent sub-district access point, and mobile host comprises:
Determination module: be used in the discovery access point stage of roaming switching, when adjacent sub-district access point was searched for, only the channel frequency to all adjacent sub-district access points scanned, and searches for the channel frequency of adjacent sub-district access point;
Scanning handover module: be used for carrying out the sub-district switching according to the channel frequency of the adjacent sub-district access point that searches.
The specific embodiments that is provided by the invention described above only scans the channel frequency of all adjacent sub-district access points just because of mobile host as can be seen, makes MH roaming handover delay diminish.
Description of drawings
Fig. 1 is that discovery AP stage time delay generation schematic diagram is switched in roaming in the prior art;
Fig. 2 is the first embodiment method flow diagram provided by the invention;
Fig. 3,4,5 is the first embodiment cellular network schematic diagram provided by the invention;
Fig. 6 is the second embodiment mobile host structure chart provided by the invention;
Fig. 7 is the 3rd an embodiment wireless local area network (WLAN) system structure chart provided by the invention.
Embodiment
In order to solve the bigger problem of MH roaming handover delay, the embodiment of the invention provides a kind of method that realizes that the wireless local network roaming switches, be that example describes now with the WLAN that is operated in the 2.4G frequency range, but be not limited to be operated in the WLAN of 2.4G frequency range, as it is suitable equally to be operated in the WLAN of 5.8G frequency range.The IEEE802.11b protocol specification, WLAN has 11 channel frequencys (pressing the FCC standard) in 2.4G frequency range one, be respectively: channel 1 (centre frequency is 2412MHz), channel 2 (centre frequency is 2417MHz), channel 3 (centre frequency is 2422MHz), channel 4 (centre frequency is 2427MHz), channel 5 (centre frequency is 2432MHz), channel 6 (centre frequency is 2437MHz), channel 7 (centre frequency is 2442MHz), channel 8 (centre frequency is 2447MHz), channel 9 (centre frequency is 2452MHz), channel 10 (centre frequency is 2457MHz), channel 11 (centre frequency is 2462MHz).Wherein have only channel 1, channel 6, channel 11 to be the channel of non-overlapping copies.
First embodiment provided by the invention is a kind of method that realizes that the wireless local network roaming switches, and method flow comprises as shown in Figure 2:
Step 101:MH is in the discovery AP stage that roaming is switched, and when adjacent sub-district AP was searched for, MH only scanned the channel frequency of all adjacent sub-district access points, searches for the channel frequency of adjacent sub-district access point.
Step 102:MH carries out the sub-district switching according to the channel frequency of the adjacent sub-district access point that searches.
MH has dual mode that AP is searched in the step 101, i.e. active searching and passive search.When losing for a certain reason, MH just initiates the active searching pattern when being lower than its predefined critical value with the contact of former AP or the signal to noise ratio of receiving the AP signal; On the contrary, AP also regularly sends the existence of beacon (Beacon) signal indicating oneself, finds that when MH receives this signal its signal strength signal intensity is higher than the AP that is connecting at present, and this situation is passive search pattern.
In the cellular network as shown in Figure 3, each hexagon is an AP overlay area, the channel frequency of neighbor cell is different, is respectively channel 1, channel 5, channel 9, when MH when channel 1 sub-district moves to other sub-districts, when MH searches for the channel frequency of adjacent sub-district access point, by only channel 5,9 being scanned, the channel frequency of searching for adjacent sub-district access point is that channel 5 still is channel 9, and carries out the sub-district switching.If when MH when channel 5 sub-districts move to other sub-districts, when MH searches for the channel frequency of adjacent sub-district access point, by only channel 1,9 being scanned, if when MH when channel 9 sub-districts move to other sub-districts, when MH searches for the channel frequency of adjacent sub-district access point, by only channel 1,5 being scanned.The channel frequency that each sub-district AP uses in this WLAN (wireless local area network) that this MH can manually set in advance before entering WLAN (wireless local area network): channel 1, channel 5, channel 9, like this at MH when one of them sub-district moves to other sub-districts, the channel frequency that only need search for other 2 sub-districts gets final product.
In the network as shown in Figure 4, each hexagon is an AP overlay area, the channel frequency of neighbor cell is different, is respectively channel 3, channel 7, channel 11, when MH when channel 3 sub-districts move to other sub-districts, when MH searches for the channel frequency of adjacent sub-district access point, by only channel 7,11 being scanned, the channel frequency of searching for adjacent sub-district access point is that channel 7 still is channel 11, and carries out the sub-district switching.The quantity of certainly adjacent channel is not limited to two, as the neighbor cell channel of channel 3 sub-districts is: channel 1, channel 5, channel 7, channel 9, channel 11.Or the neighbor cell channel of channel 3 sub-districts is: channel 7, channel 9, channel 11.When MH when channel 3 sub-districts move to other sub-districts, when MH searches for the channel frequency of adjacent sub-district access point, only the neighbor cell channel is scanned.This MH is after entering WLAN (wireless local area network), this MH place sub-district AP informs the channel frequency that each sub-district AP uses in this WLAN (wireless local area network): channel 3, channel 7, channel 11, perhaps sub-district, place AP informs the channel frequency that neighbor cell AP uses in this WLAN (wireless local area network), like this at MH when one of them sub-district moves to other sub-districts, the channel frequency that only need search for other 2 sub-districts gets final product.
In the network of Fig. 5, each hexagon is an AP overlay area, the channel frequency of neighbor cell is different, it is respectively channel 1, channel 6, channel 11 (centre frequency is 2462MHz) is identical in top principle, when MH when a certain sub-district moves to other sub-districts, as long as search other two channel frequencys except that this sub-district.
In WLAN disposed, for fear of co-channel interference, as shown in Figure 5, the frequency configuration of adjacent AP was set to the channel of non-overlapping copies, i.e. centre frequency minimum interval 25MHz.In the 2.4G frequency range, the available channel of non-overlapping copies has three, the channel frequency of the current continuous AP of MH may be channel 1, channel 6 or channel 11, when mobile host is roamed, when next AP is scanned, can search for (channel frequency that N is the current continuous AP of MH) to the frequency of N+25MHz, N+50MHz, N-25MHz or N-50MHz, and needn't be from channel 1 to channel 11 scan one by one.
The channel frequency of 1 adjacent sub-district access point that MH may only search in the step 102, as only searching channel 1, then MH changes its channel frequency into channel 1 and carries out the sub-district and switches, the channel frequency of 2 adjacent sub-district access points that MH also may search, as search channel 1 and channel 11, then the predetermined strategy of MH basis changes its channel frequency into channel 1 and carries out the sub-district switching and (receive the high channel frequency of signal to noise ratio of AP signal as predetermined strategy for selection in each channel frequency, be higher than the signal to noise ratio of on channel 11, receiving the AP signal in the signal to noise ratio of receiving the AP signal on the channel 1, so selective channel 1 is carried out the sub-district switching).
Second embodiment provided by the invention is a mobile host, and its structure comprises as shown in Figure 6:
Determination module 201: be used in the discovery access point stage of roaming switching, when adjacent sub-district access point was searched for, only the channel frequency to all adjacent sub-district access points scanned, and searches for the channel frequency of adjacent sub-district access point;
Handover module 202: be used for carrying out the sub-district switching according to the channel frequency of the adjacent sub-district access point that searches.
Further, the channel frequency that switches the channel frequency of preceding sub-district and all adjacent sub-district access points of the mobile hosts under the handover module 202 is the channel frequency of non-overlapping copies each other.
Further, determination module 201: also be used for adjacent sub-district access point is carried out active searching.
Further, determination module 201: also be used for adjacent sub-district access point is carried out passive search.
Further, determination module 201: also be used for scanning according to the channel frequency of the adjacent sub-district access point that sets in advance; Or the channel frequency of the adjacent sub-district access point that this sub-district access point is informed before switching according to roaming scans.
The 3rd embodiment provided by the invention is a kind of WLAN (wireless local area network), and its structure comprises as shown in Figure 7:
Determination module 201: be used for mobile host in the discovery access point stage that roaming is switched, when adjacent sub-district access point was searched for, only the channel frequency to all adjacent sub-district access points scanned, and searches for the channel frequency of adjacent sub-district access point;
Handover module 202: be used for carrying out the sub-district switching according to the channel frequency of the adjacent sub-district access point that searches.
Further, to switch the channel frequency of the channel frequency of preceding sub-district access point 11 and all adjacent sub-district access points 12 be the channel frequency of non-overlapping copies each other to the mobile hosts under the handover module 202 20.
Further, determination module 201: also be used for adjacent sub-district access point is carried out active searching.
Further, determination module 201: also be used for adjacent sub-district access point is carried out passive search.
Further, determination module 201: also be used for scanning according to the channel frequency of the adjacent sub-district access point that sets in advance; Or the channel frequency of the adjacent sub-district access point that this sub-district access point is informed before switching according to roaming scans.
Obviously, those skilled in the art can carry out various changes and modification to the present invention and not break away from the spirit and scope of the present invention.Like this, if of the present invention these are revised and modification belongs within the scope of claim of the present invention and equivalent technologies thereof, then the present invention also is intended to comprise these changes and modification interior.
Claims (10)
1, a kind of method that realizes that the wireless local network roaming switches is characterized in that, comprising:
Mobile host is in the discovery access point stage that roaming is switched, and when adjacent sub-district access point was searched for, mobile host only scanned the channel frequency of all adjacent sub-district access points, searches for the channel frequency of adjacent sub-district access point;
Mobile host carries out the sub-district switching according to the channel frequency of the adjacent sub-district access point that searches.
2, the method for claim 1 is characterized in that, the channel frequency that mobile host switches the channel frequency of preceding sub-district and all adjacent sub-district access points is the channel frequency of non-overlapping copies each other.
3, method as claimed in claim 2 is characterized in that, adjacent sub-district access point is carried out active searching or passive search.
4, method as claimed in claim 2 is characterized in that, mobile host only scans the channel frequency of all adjacent sub-district access points and is specially:
Mobile host scans according to the channel frequency of the adjacent sub-district access point that sets in advance; Or
The channel frequency of the adjacent sub-district access point that this sub-district access point was informed before mobile host switched according to roaming scans.
5, a kind of mobile host is characterized in that, comprising:
Determination module: be used in the discovery access point stage of roaming switching, when adjacent sub-district access point was searched for, only the channel frequency to all adjacent sub-district access points scanned, and searches for the channel frequency of adjacent sub-district access point;
Handover module: be used for carrying out the sub-district switching according to the channel frequency of the adjacent sub-district access point that searches.
6, mobile host as claimed in claim 5 is characterized in that, determination module: also be used for adjacent sub-district access point is carried out active searching or passive search.
7, mobile host as claimed in claim 5 is characterized in that, determination module: also be used for scanning according to the channel frequency of the adjacent sub-district access point that sets in advance; Or
The channel frequency of the adjacent sub-district access point that this sub-district access point is informed before switching according to roaming scans.
8, a kind of WLAN (wireless local area network) comprises that mobile host, a mobile host switch preceding sub-district access point and adjacent sub-district access point, is characterized in that mobile host comprises:
Determination module: be used in the discovery access point stage of roaming switching, when adjacent sub-district access point was searched for, only the channel frequency to all adjacent sub-district access points scanned, and searches for the channel frequency of adjacent sub-district access point;
Handover module: be used for carrying out the sub-district switching according to the channel frequency of the adjacent sub-district access point that searches.
9, WLAN (wireless local area network) as claimed in claim 8 is characterized in that, determination module: also be used for adjacent sub-district access point is carried out active searching or passive search.
10, WLAN (wireless local area network) as claimed in claim 8 is characterized in that, determination module: also be used for scanning according to the channel frequency of the adjacent sub-district access point that sets in advance; Or
The channel frequency of the adjacent sub-district access point that this sub-district access point is informed before switching according to roaming scans.
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| CNA2008102473150A CN101448291A (en) | 2008-12-29 | 2008-12-29 | Method, terminal and system for wireless local area network roaming switch |
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| CNA2008102473150A CN101448291A (en) | 2008-12-29 | 2008-12-29 | Method, terminal and system for wireless local area network roaming switch |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102655686A (en) * | 2012-05-08 | 2012-09-05 | 华为技术有限公司 | Frequency spectrum spreading method and device of wireless local area network (WLAN) |
| CN102938923A (en) * | 2012-11-05 | 2013-02-20 | Tcl通讯（宁波）有限公司 | Wireless access point sequencing method based on mobile terminal and mobile terminal |
| CN103686789A (en) * | 2013-11-29 | 2014-03-26 | 国家电网公司 | Method for lowering connection lost rate of wireless network |
| CN105144786A (en) * | 2013-05-29 | 2015-12-09 | Nec平台株式会社 | Wireless communication terminal and roaming method for same |
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2008
- 2008-12-29 CN CNA2008102473150A patent/CN101448291A/en active Pending
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102655686A (en) * | 2012-05-08 | 2012-09-05 | 华为技术有限公司 | Frequency spectrum spreading method and device of wireless local area network (WLAN) |
| WO2013166867A1 (en) * | 2012-05-08 | 2013-11-14 | 华为技术有限公司 | Frequency spectrum spreading method and device of wireless local area network |
| CN102655686B (en) * | 2012-05-08 | 2015-01-07 | 华为技术有限公司 | Frequency spectrum spreading method and device of wireless local area network (WLAN) |
| CN102938923A (en) * | 2012-11-05 | 2013-02-20 | Tcl通讯（宁波）有限公司 | Wireless access point sequencing method based on mobile terminal and mobile terminal |
| CN102938923B (en) * | 2012-11-05 | 2016-09-14 | Tcl通讯（宁波）有限公司 | A kind of WAP sort method based on mobile terminal and mobile terminal thereof |
| CN105144786A (en) * | 2013-05-29 | 2015-12-09 | Nec平台株式会社 | Wireless communication terminal and roaming method for same |
| US9706460B2 (en) | 2013-05-29 | 2017-07-11 | Nec Platforms, Ltd. | Wireless communication terminal and roaming method for wireless communication terminal |
| CN103686789A (en) * | 2013-11-29 | 2014-03-26 | 国家电网公司 | Method for lowering connection lost rate of wireless network |
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Open date: 20090603 |