A New Cross-Layer User Scheduler for Wireless Multimedia Relay Networks

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The authors propose a new scheduler for Wireless Multimedia Relay Networks (WMRNs). Their scheduler is designed to account for delay, Symbol Error Probability (SEP), and Packet Loss Probability (PLP) due to buffer overflow. They develop a cross-layer scheduling approach for the downlink to balance these system metrics. Their scheduler is based on a new metric which is referred to as the Delay in Packet Scheduling (DPS). The user with the largest weighted signal-to-noise ratio is scheduled, where the weight is a function of the DPS. They then derive analytical expressions for the Probability Mass Function (PMF) of the DPS, and the SEP of the scheduled user in Rayleigh fading.