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.
　　分組業(yè)務數(shù)據(jù)節(jié)點
　　相對于CDMAOne網(wǎng)絡，與CDMA 2000系統(tǒng)相關聯(lián)的PDSN是一個新部件。在處理所提供的分組數(shù)據(jù)業(yè)務時，PDSN是一個基本單元。其作用是支持分組數(shù)據(jù)業(yè)務，在分組數(shù)據(jù)的會話過程中，執(zhí)行下列主要功能：
　　1、建立、維護和終斷用戶的PPP會話；
　　2、支持簡單和移動IP分組業(yè)務；
　　3、通過無線分組接口建立、維持和終斷與無線網(wǎng)絡的邏輯鏈接；
　　4、進行移動臺用戶到AAA服務器的認證、授權和計費；
　　5、接受來自AAA服務器的對于移動用戶的服務參數(shù)；
　　6、路由去往和來自外部分組數(shù)據(jù)網(wǎng)的數(shù)據(jù)包；
　　7、收集轉接到AAA服務器的使用數(shù)據(jù)等。

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