Seamless video session handoff between WLANs

Authors:
Claudio de Castro Monteiro;Paulo Roberto de Lira Gondim;Vinícius de Miranda Rios
Affiliations:
Computation Department, Federal Institute of Education, Science and Technology of Tocantins, Palmas, Brazil;Electrical Engineering Department, Faculty of Technology, University of Brasilia, Brasília, Brazil;Informatics Department, University of Tocantins, Tocantins, Brazil
Venue:
Journal of Computer Systems, Networks, and Communications - Special issue on WiMAX, LTE, and WiFi interworking
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 IAPP approach.