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Summary: Improving the IEEE 802.11 MAC Layer Handoff
Latency to Support Multimedia Traffic
Yogesh Ashok Powar and Varsha Apte
Dept. of Computer Science and Engineering
Indian Institute of Technology Bombay
Mumbai 400 076, India
Email: {yogesh, varsha}@cse.iitb.ac.in
Abstract-- Multimedia applications can be offered to mobile
users on the IEEE 802.11 WLAN, if their bandwidth, delay and
jitter requirements are met, even in the presence of handoffs.
Applications such as VoIP require a delay of less than 150
msecs and packet loss less than 3%. Studies have shown that
the latencies achieved by existing handoff implementations can
exceed 200 ms and packet loss can exceed 10%. Thus, there is a
need for fast handoff solutions, that can meet multimedia traffic
requirements.
We propose a mechanism for layer-2 fast handoff with the help
of background scanning, restricted channel set and preauthenti-
cation which does not require any code modification at the access
points. The mechanism has been implemented in the MadWiFi
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