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Rate-Distorsion Based Cross-Layer Scheduling for Real Time Video Communication

This article proposes a novel idea of downlink scheduling for real time video communication over LTE cellular networks. The technique is based on cross-layer coding where a scheduling algorithm uses rate-distorsion characteristics produced by video source encoder at application level. The scheduling algorithm is currently under development. Simulation results presented here concern partial performances evaluation of existing scheduling algorithms designed for real time communication over LTE cellular networks. Three candidate algorithms: proportional fair (PF), exponential proportional fair (EXP-PF) and modified largest weighted delay first (M-LWDF) algorithms are considered. Open source LTE-Sim was used as simulation tool. Tests have been conducted using a single cell scenario without interference in which we consider a mixture of real time video, voice over IP and best effort applications. However, only results for real time video are compared. We conjecture then that, by exploiting rate-distorsion curves of typically encoded video to modify accordingly exponent in the EXP-PF algorithm, performance improvements may be attained.