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An Efficient Scanning Group and Order Decision Method Using Neighbor Network Information in Wireless LAN  

Kang, Dong-Wan (인하대학교 정보통신대학원 멀티미디어통신망 연구실)
Choi, Jae-Kark (인하대학교 정보통신대학원 멀티미디어통신망 연구실)
Yoo, Sang-Jo (인하대학교 정보통신대학원)
Publication Information
The Journal of Korean Institute of Communications and Information Sciences / v.35, no.2A, 2010 , pp. 142-152 More about this Journal
Abstract
When a mobile station(MS) performs a handover, in the IEEE 802.11 WLAN, MS's channel scanning for discovering new available APs is the dominating factor in handover latency, accounting 90% of overall latency. In order to reduce such a scanning latency, we focus on the method for reducing the number of channels for the MS in handover process to scan. With the help of IEEE 802.21 information server(IS), a proper order of groups of channels to be scanned is offered by the current AP depending on the information of neighbor APs in terms of the distance from serving AP, traffic load and network topology. By using this scanning order, the passive scanning of a MS in normal operation enables the MS to filter out the unavailable channels, and thus to classify the candidate channels of neighbor APs into three groups. Then, a handover-imminent MS can perform the active scanning from the most reliable group of channels. Simulation results show that the proposed scanning scheme reduce the scanning latency in comparison with the conventional scheme.
Keywords
Handover Latency; Wireless LAN; Scanning Group; Scanning Order;
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  • Reference
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