PDSN

　　PDSN
　　A Packet Data Serving Node (PDSN) provides access to the Internet, intranets and applications servers for mobile stations utilizing a cdma2000 Radio Access Network (RAN). Acting as an access gateway, PDSN provides simple IP and mobile IP access, foreign agent support, and packet transport for virtual private networking. It acts as a client for Authentication, Authorization, and Accounting (AAA) servers and provides mobile stations with a gateway to the IP network. Mobility differentiates Cisco’s PDSN from the traditional routed network. With PDSN, the host can move and, therefore, there must be a way to forward packets to it. Cisco&＃039;s PDSN solution offers a secure way to provide packet data services to mobile stations.
　　分组业务数据节点
　　相对于CDMAOne网络，与CDMA 2000系统相关联的PDSN是一个新部件。在处理所提供的分组数据业务时，PDSN是一个基本单元。其作用是支持分组数据业务，在分组数据的会话过程中，执行下列主要功能：
　　1、建立、维护和终断用户的PPP会话；
　　2、支持简单和移动IP分组业务；
　　3、通过无线分组接口建立、维持和终断与无线网络的逻辑链接；
　　4、进行移动台用户到AAA服务器的认证、授权和计费；
　　5、接受来自AAA服务器的对于移动用户的服务参数；
　　6、路由去往和来自外部分组数据网的数据包；
　　7、收集转接到AAA服务器的使用数据等。