QoS-Oriented Packet Scheduling for Efficient Video Support in OFDMA-Based Packet Radio Systems

摘要

Next-generation mobile networks will provide users with high data rates, increased mobility and various services. The initial step made in LTE and LTE-A is adopting the OFDMA air interface and utilization of dynamic resource allocation techniques maximizing the cell throughput and coverage as part of enhanced radio resource management (RRM) functionality. Moreover, the control of the network resource division among users is performed by packet scheduler and different scheduling strategies are applied according to traffic scenario. Typically, video traffic (real-time video streaming, mobile TV etc.) requires higher data rates and certain quality of service (QoS) constrains, i.e. packet size, arrival rate, head-of-line (HOL) packet delay, etc. In this article, we propose a flexible and fairness-oriented packet scheduling approach for realtime video delivery, built on advanced QoS-aware multiuser proportional fair (PF) scheduling principle. The performance of the overall scheduling process is investigated in details in terms of cellular system capacity, resource allocation fairness and video traffic QoS guarantees. Experimental results reveal the upper bounds of real-time video traffic support in downlink LTE multiuser network.