A Seamless Handoff Scheme Supporting Media Streaming on EDCA Over Wireless LAN

• Main Authors: Ting-li Liu, 劉頂立
• Other Authors: Yaw-Chung Chen
• Format: Others
• Language: en_US
• Published: 2006
• Online Access: http://ndltd.ncl.edu.tw/handle/18089492002411300547

碩士 === 國立交通大學 === 資訊科學與工程研究所 === 95 === Seamless or fast handoff schemes to support mobility of IEEE 802.11 Wireless LANs have been well developed based on the assumption that a set of next-AP/AR candidates are available prior to a handoff. A neighbor graph is one of the major strategies used to provide such information among the related studies. However, neighbor graphs have not been widely applied yet due to its inherent drawbacks. In this thesis, a so-called “discrete scan” scheme is proposed to substitute the function of a neighbor graph without drawbacks. Moreover, several mechanisms based on discrete scan are presented to help a mobile node select a desired next AP to handoff to. The analytical model and simulation are elaborated to show performance of the approaches. Discrete scan may bring concerns on its impact to received QoS of the mobile node. However, the simulation results show that disruptions caused by discrete scan can be controlled within an acceptable value for a media streaming device working under EDCA over wireless LAN.