Bottom-up approach to cross-layer design for video transmission over wireless channels

In this paper, a bottom-up approach to cross-layer design is proposed which is based on the partitioning of the optimized parameters into private and interfacing parameters. The optimization is divided into an intra-layer optimization of private parameters and an inter-layer optimization of interfacing parameters. This concept keeps as much of the optimization local to the layers as possible and thereby reduces the amount of additional information exchange and associated delay times caused by cross-layer design. Intra- and inter-layer optimization are illustrated for a simplified multi-user wireless communication system which offers a streaming video service application to its mobile clients.