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多点投递和相应的群组管理是新型运输层协议最重要的特征，是现阶段协议研究的热点和难点。本文分析新型应用对群组管理的通信需求，以及高速网络提供的多点投递传输服务，指出传统协议无法扩展到多点投递场合的原因；然后依据可靠性需求，介绍两类多点投递运输协议，研究相关的协议机制和控制策略；最后是一些协议分析和比较。
Multipoint delivery and the corresponding group management is the most important feature of the new transport layer protocol, which is the hot and difficult point of protocol research at this stage. This paper analyzes the communication needs of new applications for group management, as well as multi-drop delivery services provided by high-speed networks, and points out the reasons why traditional protocols can not be extended to multi-drop delivery scenarios. Based on the reliability requirements, two types of multi-drop delivery protocols , Research related protocol mechanism and control strategy; Finally, some protocols analysis and comparison.