Error and Congestion Resilient Video Streaming over Broadband Wireless

Computers

Laith Al-Jobouri²  Ismail A. Ali¹  Martin Fleury²  Mohammed Ghanbari² 

[1] Department of Electrical and Computer Engineering, University of Duhok, 1006 AJ Duhok, Iraq; E-Mail:;School of Computer Science and Electronic Engineering, University of Essex, Wivenhoe Park, Colchester CO4 3SQ, UK; E-Mails:

关键词: broadband wireless;    access network congestion;    data partitioning;    multimedia networking;    packet scheduling;   

DOI  :  10.3390/computers4020113

来源: mdpi

【 摘 要 】

In this paper, error resilience is achieved by adaptive, application-layer rateless channel coding, which is used to protect H.264/Advanced Video Coding (AVC) codec data-partitioned videos. A packetization strategy is an effective tool to control error rates and, in the paper, source-coded data partitioning serves to allocate smaller packets to more important compressed video data. The scheme for doing this is applied to real-time streaming across a broadband wireless link. The advantages of rateless code rate adaptivity are then demonstrated in the paper. Because the data partitions of a video slice are each assigned to different network packets, in congestion-prone wireless networks the increased number of packets per slice and their size disparity may increase the packet loss rate from buffer overflows. As a form of congestion resilience, this paper recommends packet-size dependent scheduling as a relatively simple way of alleviating the buffer-overflow problem arising from data-partitioned packets. The paper also contributes an analysis of data partitioning and packet sizes as a prelude to considering scheduling regimes. The combination of adaptive channel coding and prioritized packetization for error resilience with packet-size dependent packet scheduling results in a robust streaming scheme specialized for broadband wireless and real-time streaming applications such as video conferencing, video telephony, and telemedicine.

【 授权许可】

CC BY   
© 2015 by the authors; licensee MDPI, Basel, Switzerland.