This paper discusses techniques for transmitting smoothed video more e ciently over a wireless network. The uctuation of wireless channel conditions can add a signi cant amount of delay to video packets and cause them to miss their play-out time. If a video is smoothed, it is possible to selectively deliver packets delayed at the base-station to reduce the impact of the missing packets to the video quality. In this paper, we present a simple yet e ective packet selection algorithm which accomplishes this goal. The algorithm determines whether to transmit a packet based on channel conditions as well as how likely higher priority layers in the rest of the video may be delivered on time. We introduce the concept of \quality index" to measure the performance of the algorithm. Results from trace-driven simulations show that the performance of the algorithm is close to optimum under a wide variety of channel conditions when the threshold is set between 0.7 and 0.9.
Authors in REF propose a selective packet algorithm that runs in the base-station to determine which of the delayed packets to deliver.
A Packet Selection Algorithm for Adaptive Transmission of Smoothed Video Over a Wireless Channel
JOURNAL OF PARALLEL AND DISTRIBUTED COMPUTING
Computer Science