IP多播在无线接入系统的实现与分析

Implementation and Analysis of IP Multicasting in Wireless Access System

IP多播是一类重要的基于IP的应用,支持很多业务。无线接入系统使用灵活,作为IP网络的最后一跳,对组网寻址、服务质量构成影响;鉴于无线接入系统存在带宽有限、传输质量逊于有线方式等不足,所以在寻址方面通过合理的无线链路多播机制与IP多播寻址进行映射,在传输质量方面,通过对有线分组进行分片、ARQ、流控等机制,弥补UDP协议无流控、无确认等缺陷,以期提高服务质量。

IP Muhicasting which sustains many kinds of businesses is an important application based on IP technology. As the last hop of IP network, wireless access system has good flexibility and has influences on network addressing and quality of service; the bandwidth of wireless access system is limited and the transmission quality in the wireless mode is inferior to that in the wire mode, so in the way of addressing, it must introduce the reasonable multicast mechanism of wireless links to mapping to IP Multicasting addressing, also in the aspect of transmission quality, by dividing the finite groups into several patches and introducing ARQ as well as efficient flow control mechanism, it can make up many defects of the UDP protocol characteristics such as no flow control and no confirmation. All of this can improve the quality of services.