Delay Analysis for Compressed Video Traffic over Two-Hop Wireless Moving Networks
Wei Song · 2011
Nowadays, the pervasive wireless networks enable ubiquitous high-rate wireless access from everywhere. In addition to extensive interworking studies in an indoor environment, there are ever-increasing demands for systematic deployment of moving networks in a vehicular environment such as public transits or transitory personal area networks which are irregularly powered on. In this paper, the delay performance is investigated for video traffic over two-hop wireless moving networks. A Markov-modulated process is used to characterize the variation and auto-correlation of video frame size rather than the traffic rate. In view of the burst arrival process of video traffic, a discrete-time batch arrival queueing process is employed to analyze the statistics of packet transfer delay. On the other hand, since traffic flows from a moving network can be multiplexed at a local gateway, a fractional Brownian motion (FBM) process is considered to model the self-similar aggregate traffic. Based on the evaluation of overall packet transfer delay for two-hop moving networks, we can estimate bandwidth requirements for a backhaul connection and local links with individual video flows within the moving network. Numerical and simulation study are conducted to validate the accuracy of the analysis.