无线网络终端协作多播技术研究

Cooperative Multicast Scheme Research in Wireless Networks

终端协作多播技术,因其能有效改善广播多播吞吐量的瓶颈问题而成为新的研究方向。针对当前多媒体广播多播业务的流行,对传统广播多播的缺点做了简要分析,介绍了协作通信与协作多播的基本原理,重点分析了当前国内外协作多播技术的研究现状,从中继节点的协作方式、协作策略与协作中继选择、多阶段协作多播三方面展开阐述,概括出当前的研究主要集中于提高吞吐量与降低系统功耗两方面。最后,对协作多播提出了展望,说明了协作多播走向商用还需解决的问题。

Multicast communication is an efficient mechanism for one-to-many transmissions over a broadcast wireless channel,but the group member with the worst channel condition becomes the bottleneck and results in conservative resource utilization. Cooperative multicast has gotten much attention because it can achieve high throughput than existing multicast scheme.A detailed introduction of the research status of cooperative multicast is given in this article,from which we find that most researches focus on the relay selection and the energy efficient cooperative multicast scheme.