Aiming at the self-beneficial attack problem in layered multicast protocol, a secure layered multicast protocol is presented. The congestion state related access control algorithm is designed.

针对分层组播协议存在的自利型攻击问题，提出了一种安全分层组播协议，设计了基于拥塞状态的访问控制算法。

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The NGN adapts the layered structure as service layer, control layer, media transport layer and access layer.

下一代网络采用分层的结构，分为松散耦合的业务层、控制层、媒体传输层和接入层。

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