Video session handoff between WLANs

Authors:
Claudio de Castro Monteiro;Paulo Roberto de Lira Gondim;Vinicius de Miranda Rios;Alex Coelho;Stéphany Moraes Martins
Affiliations:
Federal Institute of Education, Science and Technology of Tocantins, Computation Department, Brazil;University of Brasilia;University of Tocantins, Informatics Department, Tocantins, Brazil;Catholic Faculty of Tocantins, Information System Department, Tocantins, Brazil;Catholic Faculty of Tocantins, Information System Department, Tocantins, Brazil
Venue:
ICACT'10 Proceedings of the 12th international conference on Advanced communication technology
Year:
2010

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Abstract

Handoff in a distributed IEEE 802.11 Wireless LAN network is a source of significant amount of problems on the video transmission environment. The visual quality of video streaming applications is lowered when stations are in handoff status. In this paper we introduce an architecture of a session proxy (SP), which tries to preserve the quality of the streaming video upon each handoff between access points. We have evaluated thresholds of RSSI and Loss Frame Rate (LFR) for deciding the moment when the handoff process shall begin. Our solution performance was evaluated in a testbed implementation for MPEG-4 video-on-demand with one video server (VLS) and two FreeBSD based access points supporting Mobile IP, DHCP Server and lAPP approach.