一种多业务UPC/NPC结构模型

Multiple Service UPC/NPC Architecture

ＡＴＭ网络中的用法／网络参数控制（ＵＰＣ／ＮＰＣ）通过阻止有意或无意的用户滥用速率进入网络，以保护网络资源和其他用户的服务质量，因而是保证网络正常运行的重要手段．由于ＡＴＭ网络为多种业务提供服务，而各种业务类型的特征和服务质量要求相差很大，因此对ＡＴＭ网络的ＵＰＣ／ＮＰＣ提出了新的要求．提出了一种ＡＴＭ网络多业务ＵＰＣ／ＮＰＣ结构模型，该模型适用于包括ＡＢＲ在内的全部现有ＡＴＭ服务类型．由于采用了多种业务的统一接口，因此实现简单．同时，在对ＡＢＲ业务实行ＵＰＣ／ＮＰＣ时，考虑到各种不同流量控制机制之间的兼容性．实验证明，该结构是简单有效的．

Usage/network parameter control (UPC/NPC) is an important measure to guarantee ATM network performance. It can protect network resources and QoS of well behaved users by rejecting malicious as well as unintentional misbehaved user traffic. Since ATM network can provide various categories of service, and the traffic and QoS requirements of each category vary a lot, it is not sufficient to have a UPC/NPC that can only deal with one category of service. In this paper, a new UPC/NPC architecture for multiple service categories in ATM network is proposed, which supports all the existing service categories including CBR, VBR and ABR service. With uniform interface to all the services,it is simple to be implemented. Compatbility of the different ABR flow control schemes is also taken into consideration.The simulation results show that it is a simple yet effective architecture.