Title :
Analysis of Multi-User Congestion Control for Video Streaming Over Wireless Networks
Author :
Zhu, Xiaoqing ; Girod, Bernd
Author_Institution :
Inf. Syst. Lab., Stanford Univ., CA
Abstract :
When multiple video sources are live-encoded and transmitted over a common wireless network, each stream needs to adapt its encoding parameters to wireless channel fluctuations, so as to avoid congesting the network. We present a stochastic system model for analyzing multi-user congestion control for live video coding and streaming over a wireless network. Variations in video content complexities and wireless channel conditions are modeled as independent Markov processes, which jointly determine the bottleneck queue size of each stream. Interaction among multiple users are captured by a simple model of random traffic contention. Using the model, we investigate two distributed congestion control policies: an approach based on stochastic dynamic programming (SDP) and a greedy heuristic. Compared to fixed-quality coding with no congestion control, performance gains in the range of 0.5-1.3 dB in average video quality are reported for the optimized schemes from simulation results
Keywords :
Markov processes; dynamic programming; greedy algorithms; stochastic systems; telecommunication congestion control; telecommunication traffic; video coding; video streaming; wireless channels; SDP; greedy heuristic; independent Markov process; multiuser congestion control; stochastic dynamic programming; traffic contention model; video coding; video streaming; wireless channel; Communication system traffic control; Control system analysis; Distributed control; Fluctuations; Markov processes; Stochastic systems; Streaming media; Traffic control; Video coding; Wireless networks;
Conference_Titel :
Multimedia and Expo, 2006 IEEE International Conference on
Conference_Location :
Toronto, Ont.
Print_ISBN :
1-4244-0366-7
Electronic_ISBN :
1-4244-0367-7
DOI :
10.1109/ICME.2006.262639
