Internet TV中受控组播的设计与实现

在Internet TV中，为解决现有的组播协议不支持用户认证，缺乏对数据访问的控制，在流量扩散安全性，频道切换延时等方面上存在的问题，通过扩展现有的组播协议，提出了完整的网络接入认证流程，加入组播组流程，退出组播组流程，异常／强制退出组播组流程，断网流程，实现了受控组播协议，使得对数据的访问得到控制，整个服务完全受控于服务方，减少了频道切换的响应时间，并通过SR仿真试验，验证了受控组播协议在Internet TV中的可实用性。

Design and Realization of Constrained-based Multicast in Internet TV

In Internet TV,in order to solve the problems such as the multicast protocol has no user authorization,short of the control of the data,security of stream expanding,and long delay with channel switch,a constrained-based multicast protocol is presented.By expanding the existing multicast protocol,putting forward the whole user authorization flow,the multicast add flow,the multicast quit flow,the multicast compel quit flow,the constrained-based multicast protocol is realized,the data access is controlled,the whole system is controlled by the server and the delay of channel switch is reduced.By the SR simulation experiment,the practicability of the multicast protocol is validated in Internet TV.