Faculty of Computing - Department of Communication Systems/Blekinge Institute of Technology
Abstract
To cope with the rapid growth of multimedia applications that requires dynamic
levels of quality of service (QoS), cross-layer (CL) design, where multiple
protocol layers are jointly combined, has been considered to provide diverse
QoS provisions for mobile multimedia networks. However, there is a lack of a
general mathematical framework to model such CL scheme in wireless networks
with different types of multimedia classes. In this paper, to overcome this
shortcoming, we therefore propose a novel CL design for integrated
real-time/non-real-time traffic with strict preemptive priority via a
finite-state Markov chain. The main strategy of the CL scheme is to design a
Markov model by explicitly including adaptive modulation and coding at the
physical layer, queuing at the data link layer, and the bursty nature of
multimedia traffic classes at the application layer. Utilizing this Markov
model, several important performance metrics in terms of packet loss rate,
delay, and throughput are examined. In addition, our proposed framework is
exploited in various multimedia applications, for example, the end-to-end
real-time video streaming and CL optimization, which require the priority-based
QoS adaptation for different applications. More importantly, the CL framework
reveals important guidelines as to optimize the network performance