Multipath Routing with Adaptive Carrier Sense for Video Applications in Wireless Ad-hoc Networks

摘要

Video streaming over wireless ad-hoc networks containing mobile nodes is a quite complicated task because existing transport and routing protocols are not well suited for such task. Video transport is very sensitive to packet delay and packet loss, but in mobile ad hoc wireless networks (MANET) links could be frequently interrupted due to node mobility, interference, channel fading etc. Use of MANETs is increasing and demand for multimedia services is expected to grow significantly in future. Therefore development of robust coding and transport methods maintaining QoS, as well as efficient routing protocols is important. In 802.11 standard MAC level transport protocol uses Carrier Sense Multiple Access with Collision Avoidance (CSMA/CA) method. This collision avoidance method as a side effect may prevent possibly successful data transmission events as well. This degrades delay time and data transmission rate which are very important parameters to maintain QoS in video streaming.