Title: Adaptive QoS control for real-time video communication over wireless channels

Authors: Dapeng Wu, Y. Thomas Hou, Wenwu Zhu, Zhihai He, Ya-Qin Zhang

Addresses: Department of Electrical and Computer Engineering, University of Florida, Gainesville, FL 32611 6130, USA. ' Department of Electrical and Computer Engineering, Virginia Tech, Blacksburg, VA 24061 0111, USA. ' Intel Communication Technology China Lab, Zhong Guan Cun, Haidian District, Beijing 100080, China. ' Department of Electrical and Computer Engineering, University of Missouri, Columbia, MO 65203, USA. ' Microsoft Research, Asia, Haidian District, Beijing 100080, China

Abstract: Robust transmission of real-time video over wireless channels is a challenging problem. This is because the bit error rate (BER) in wireless channels is very high and the bit errors could have devastating effects on the video presentation quality. This paper addresses this problem by introducing adaptive quality-of-service (QoS) control for real-time video communication over wireless channels. The adaptive QoS control consists of optimal mode selection and delay-constrained hybrid automatic repeat request (ARQ). By combining the best features of error-resilient source encoding, forward error correction (FEC) and delay-constrained retransmission, our proposed adaptive QoS control system is capable of achieving bounded delay, high reliability, and efficiency.

Keywords: real-time video; wireless channels; optimal mode selection; delay-constrained hybrid ARQ; QoS control; bit error rate; quality of service.

DOI: 10.1504/IJAHUC.2005.008017

International Journal of Ad Hoc and Ubiquitous Computing, 2005 Vol.1 No.1/2, pp.27 - 37

Available online: 10 Nov 2005

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