基于有线电视网络的可靠组播技术研究

Research of reliable multicast technique based on CATV network

可靠组播数据传输协议主要有基于NACK的协议、基于树的ACK协议、异步分层编码协议(ALC)以及路由辅助协议。ALC协议采用发送方分多个组播通道发送数据,通过前向纠错编码来保证数据的可靠性。基于有线电视网的可靠组播传输系统就是以ALC协议作为数据传送的基础,同时以SAP/SDP协议作为会话管理的基础,加上可靠组播传输技术来实现的。实验验证了该系统的合理性及可行性,并应用于远程教育。

Reliable multicast transport protocol mainly includes NACK, ACK based tree, asynchronous layered coding （ALC） and routing assistance protocol. ALC protocol sends data through many multicast tunnels and undertakes data reliable by forward error correction （FEC）. Reliable multicast transmission system based on CATV network implements reliable multicast transmission technology by means of transmitting data based on ALC protocol and managing based on SAP/SDP （session announcement protocol/session description protocol）. Experiment proves this system reasonable and feasible. Furthermore, this system implements tele-education application.