Methods, device and system for access point facilitated fast handoff
US8023468B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 6, 2007 |
| Grant date | Sep 20, 2011 |
| Priority date | — |
| Expiry date | Oct 12, 2029 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04W36/08
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
Methods, devices and system for access point facilitated fast handoff are provided. Each access point (AP) in a wireless local area network is provided with a primary interface and a secondary interface wherein the primary interface performs normal communication with user terminals and broadcasts standard beacon frames on its working channel, and the secondary interface broadcasts extended beacon frames on working channels of neighbor APs sequentially. The extended beacon frame includes at least information of BSSID, SSID, working channel and the like of the primary interface of the corresponding AP. The user terminal may receive the standard beacons from the serving AP it is communicating with and the extended beacons from the neighbor APs, and according to the two kinds of beacons, the terminal may calculate the signal quality with the primary interface of the serving AP and the signal qualities with the neighbor APs at the current position. By an algorithm of comparing the signal qualities of the best neighbor AP and the serving AP, the terminal may accurately and quickly determine whether to perform handoff with minimized cost.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.