Keywords: handoff, IEEE 802.11, link-layer, performance, wireless
Received August 16, 2005; revised November 21, 2005; accepted November 24, 2005.
Communicated by Yu-Chee Tseng.
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Guo-Yuan Mikko Wang and Chunhung Richard Lin
Department of Computer Science and Engineering
National Sun Yat-Sen University
Kaohsiung, 804 Taiwan
A growing number of IEEE 802.11-based wireless LANs have been set up in many
public places in the recent years. These wireless LANs provide convenient network connectivity
to users. Although mobile nodes allowed roaming across wireless LANs, handoff
latency becomes an obstacle when mobile nodes migrate between different IP networks.
Advanced, the link-layer handoff process disrupts the association when a mobile
node moves from one access point to another. Without discussing the latency of Mobility
Protocols, this link-layer handoff latency already made many real time applications can
not meet their requirements. Several actual network experiments are made to proof this
point. In this paper, it is proposed that a link-layer optimization scheme is designed to
reduce the latency of link-layer handoff procedure. No violation to the existing specifications
in the IEEE 802.11 standard and compatible with existing devices. Since the
proposed optimization scheme is worked in the base of whole handoff procedure, whatever
which Mobility Protocol is used in the upper-layer, it can take the benefit from the
proposed scheme. Even real time applications can work under an acceptable situation.
Received August 16, 2005; revised November 21, 2005; accepted November 24, 2005.
Communicated by Yu-Chee Tseng.