随着Internet的发展,要求一对多或多对多通信形式的网络应用迅速增长,IP多播服务为该类网络应用提供了一种有效的通信手段。但是基于IP的多播是一种无连接的数据传输方式(UDP),UDP数据传输是一种“尽力而为”的方式,因此在传输过程中存在丢包和乱序现象。对于某些应用,该传输的不可靠性是不允许的,因此出现了可靠多播技术。可靠多播协议的应用针对性很强,不同的应用场合对可靠多播的要求以及实现方法也大不相同。文中分析了雷达组网对多播及其实时性和可靠性的需求,参考现有的解决可靠多播主要问题的方法,初步提出了一种适合于小批量数据分发的实时可靠多播通信协议的设计方案。

With the development of Internet,IP multicast provides an efficient communication method for one-to-many or many-to-many network applications,but the multicast based on IP is a connectionless transmission method,which guarantees only best-effort delivery,so losing packets and packets out of order exit during the transmission.The unreliability of the transmission is not permitted for some applications,and then reliable multicast technology arises.Aiming at different kinds of applications,the practical implementing approaches to reliable multicast are different.On the basis of the requirements of radar netting for real time and reliability,keeping the method of the reliable multicast in existence for reference,the design of real time and reliable multicast protocol(RTRMP) for distribution of small batch is presented primarily.

TN958