A Robust Network Coding Scheme for SVC- Based Streaming over Wireless Mesh Network

摘要

Multimedia applications have been gaining popularity during last years. Fix bandwidth allocations, high bit errors rate and burst packet errors are common in wireless networks due to which conventional forward error correcting codes (FEC) become ineffective to transmit scalable video coding (SVC) based streaming in wireless mesh network. In this paper we propose a novel scheme for transmission of scalable video coding streams over wireless mesh network (WMN) based on using the cooperation among nearby nodes and opportunistic network coding (ONC). The scheme tries to select appropriate path based on network information for different SVC layers. It chooses the best path for most important layer, base layer, and less stable path for enhancement layers. Some nearby nodes along the transmission path are selected for recoding their received packets and store them in buffers for some period of time. These nearby nodes coded packets can be retransmit to receivers for recovering lost packets.