ISSN : 1796-2056
Volume : 1    Issue : 4    Date : August 2006

A Novel AP for Improving the Performance of Wireless LANs Supporting VoIP
Thavisak Manodham and Tetsuya Miki
Page(s): 41-48
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Recently, wireless LANs based on the IEEE 802.11 standard have become popular and widely
used, and Voice-over-IP (VoIP) is one of the most promising technologies to be used in mobile
devices over wireless networks. Up-to-date, new technologies have improved, providing a high data
rate to support various kinds of realtime applications. However, besides the need for higher data
rates, seamless handoff is another important issue to be addressed in order to continue supporting
real-time services across wireless LANs. In this paper we introduce a novel Access Point (AP) with
two transceivers to improve network efficiency in terms of supporting seamless handoff and
balancing the traffic load in a wireless network. In our proposed scheme, the novel AP will use the
second transceiver to scan and find neighboring STAs in the transmission range and later send the
result to its associate AP, which in turn compares and analyzes whether or not the STA should
perform a handoff. The initial results from our simulations show the novel AP module is more
effective than the conventional one in terms of providing a handoff process with low latency and
support traffic load sharing with neighbor APs.

Index Terms
Handoff, Traffic Load, MAC, IEEE 802.11, Wireless LANs