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.
Highlights
Nowadays, the most used pattern for WLANs by the market is IEEE 802.11 [1] and its extensions such as 802.11a [2] 802.11b [3], 802.11g [4], 802.11e [5], 802.11n [6], among others.Several studies have been conducted with the intention of analyzing the advantages and disadvantages of the use of wireless networks [7,8,9,10], approaching possible methods or mechanisms to avoid or reduce the problems inherent in their use.The success story of 802.11 Wireless LAN can be attributed due to its high bit rate, easy installation, and low price
We evaluated the performance of our solution and it has been compared to the standard IAPP approach
An AP1 at channel 10 An AP2 at channel 09 An station without movement at 25 m of AP1 the HA and FA was in our experiment, about 10 seconds, enough time to Real-Time Streaming Protocol (RTSP) started session with the server to be closed by an absolute inability of the protocol to resequence the frames lost
Summary
Several studies have been conducted with the intention of analyzing the advantages and disadvantages of the use of wireless networks [7,8,9,10], approaching possible methods or mechanisms to avoid or reduce the problems inherent in their use. The success story of 802.11 Wireless LAN can be attributed due to its high bit rate, easy installation, and low price. The 802.11 MAC protocol originally has objective to work at the home or office environment, but nowadays the IEEE is extending the protocol towards mobile environments, with direct application for data delivery to distant access, integrating branches of the 3G technology [1]. Seamless session continuity is still out of reach, especially for video streaming applications. The first step to achieve session continuity during handoffs in WLAN was made by the IEEE 802.11f Inter Access
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