一种适用于天地网可靠多播的传输模型

Reliable Multicast Transport Model over Hybrid Network

目前,由于卫星广播与地面网相结合的天地网平台下的远程教学等类似系统日益增加,针对卫星广播传输可靠性无法保证的问题,结合天地网平台的特点,提出了一种面向天地网的可靠多播传输模型.其中,该模型使用自适应的FEC编码与NACK相结合技术来达到在天地网上可靠多播通信的目的.一方面,该传输模型不但可以实现可靠多播通信,另外,它还可以自适应当前网络状况以提高网络资源的使用效率,进而减少网络负载,这对于天地网下卫星传输误码率易受天气影响如雨衰等现象有针对性的优点.

Although more and more applications were based on the platform combined by satellite and IP network, how to ensure the reliability of multicast on such a platform is still a problem. Taking the characteristics of satellite and IP network combined platform into account, this paper puts forward a kind of reliable multicast model that aimed at resolving the issues on this hybrid platform. Self-adjusted FEC coding and NACK technologies are combined and employed by this model to achieve the purpose—ensuring reliable multicast on satellite and IP network combined platform. Not only can this model be used to carry out reliable multicast communication, but also it can adapt by itself to the current network state, and then improve the efficiency of network and cut down the load of network. These characteristics are especially useful to the phenomenon such as that the error rate of satellite transmission is susceptible to the weather.