Adaptive Cross-Layer-Based Packet Scheduling and Dynamic Resource Allocation for LTE-Advanced Relaying Cellular Communications

摘要

In 4G, LTE-Advanced specifies the key objective that the gigabit data rate for real-time video streaming can be transmitted under a high mobility scenario; thus, packet scheduling and radio resource management become the critical techniques that should be addressed effectively. Additionally, the mechanisms of relaying and the OFDMA coding have been certainly adopted in LTE-Advanced and IEEE 802.16 j/m for the purposes of increasing the wireless service coverage and improving signal quality of UEs nearing the cell boundaries. Several studies propose some improvements for the relaying-based packet scheduling, but suffer from long packet delay, high packet dropping probability moderate system capacity, and degrading QoS of real-time packet transmissions. This paper thus proposes an Adaptive LTE-Advanced cross-layer packet Scheduling (ALS) to guarantee real-time high-speed packet service for LTE-Advanced. ALS consists of two mechanisms: (1) Adaptive Reward Priority Scheduling: the cross layer-based adaptive packet scheduling at the MAC layer and (2) Dynamic Resource Allocation algorithm: the efficient radio resource allocation at the PHY layer. Numerical results demonstrate ALS outperforms the compared approaches in system capacity, packet dropping probability, average packet delay, etc.