WiMAX接入技术在IPTV系统中的应用研究

摘要

在分析IPTV接入网的要求和WiMAX技术优势的基础上,提出了WiMAX应用于IPTV的系统模型,并具体分析了系统流程；针对IPTV业务下行数据量比较大的特点,提出了适合IPTV业务特点的下行链路实时调度(DLRTS)算法,该算法的主要目的在于降低实时业务的时延,从而保证IPTV的服务质量(QoS).仿真结果表明,与常用的轮叫调度(Round Robin)算法相比,本文算法在实时业务的时延和吞吐量两方面的性能都有明显提高,可很好地支持IPTV业务.%Based on the analysis of demands of IPTV access networks and advantages of WiMAX technology, a system model for IPTV over WiMAX was proposed and the system procedure was analysed in detail. Considering the heavy traffic in downlink direction of IPTV services, this paper proposed a downlink real-time scheduling (DLRTS) algorithm which aims at decreasing the delay of real-time traffic,thus meeting requirements of IPTV's QoS. Simulation result shows that,compared to round-robin scheduling algorithm,DLRTS improves the performance both in delay and throughput,thus can be competent for IPTV services.