本文将无线多播数据传输从功能的角度分成两部分：保证组播树的路由部分和保证数据传输部分。
This will be more wireless data transmissions from broadcast functional perspective is divided into two parts part guarantee Zubo tree routing and guarantee data transmission.
安全是多播研究中急需解决的问题。本文对多播安全中认证和组密钥管理这两个关键问题进行了研究。
Because of the importance and urgency of security to multicast, this thesis investigates two key issues, i. e. authentication and group key management, of multicast security.
以多服务组播为研究背景，研究组播的层次接入控制技术。
Hierarchical access control of multicast was studied against the background of multi-services multicast.
多权限组播通信存在多个数据流且组播组中用户权限因获得数据流的不同而不同，其安全问题较难处理。
Security is difficult to handle in multi-privileged group communications, because group users have multiple access privileges when subscribing different data streams.
IP多播组密钥管理问题是IP多播安全的核心问题。
IP multicast group key management is essential for the IP multicast security.
随着网络规模的增大，组播组多对多的通信，都对可靠组播提出了新的需求和挑战。
With the increasements of the network and communication of many-to-many, it puts new demands and challenges for reliable multicast.
为了收到发送至多播组的多播数据包，你的游戏需要加入或成为一个多播组的成员。
To receive multicast packets sent to a multicast group, your game will need to join or become a member of that multicast group.
在一实施例中，以多播呼叫诸如组呼叫，可能根据预定的准则通过单播信道或多播信道而被发送到活动用户，诸如多个活动用户。
In one embodiment, a multi-cast call, such as a group call, may be transmitted to active users via unicast channel (s) based on a predetermined criteria, such as number of active users.
实验结果及分析表明：算法在非完全组播网络上实现了较优的多约束多点对多点组播路由；
Experimental results and analyses indicated that: this algorithm carry out better multi-constraint Many-to-many multicast routing on Partial-multicast Network;
通过使用指定功能的多播组，发送请求(request)到多播组中的计算机，可以使网络变得更为有效。
Multicast enables efficient network operation by using a number of functionally specific multicast groups to send requests to a limited number of computers on the network.
通过使用指定功能的多播组，发送请求(request)到多播组中的计算机，可以使网络变得更为有效。
Multicast enables efficient network operation by using a number of functionally specific multicast groups to send requests to a limited number of computers on the network.
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