Optimal Priority Packetization with Multi-layer UEP for Video Streaming over Wireless Network

Most of current packetization schemes consider only bit error or packet erasure, both of which are common in wireless networks. This paper addresses these two problems together, and proposes an optimal packetization scheme for video streaming over wireless network, which is independent of video coding method. To combat the packet erasure, priority packetization combined with multi-layer unequal error protection (UEP) is applied on video frames. Multi-layer UEP contains low-complexity duplication of high-priority packet in application layer and different retransmission limit in media access control layer. Content-aware rate-distortion optimization is also introduced in order to countermine the distortion caused by bit errors. Simulations show that our scheme gains 2.17 dB or more compared with the conventional scheme.