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　　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(wù)數(shù)據(jù)節(jié)點(diǎn)
　　相對(duì)于CDMAOne網(wǎng)絡(luò)，與CDMA 2000系統(tǒng)相關(guān)聯(lián)的PDSN是一個(gè)新部件。在處理所提供的分組數(shù)據(jù)業(yè)務(wù)時(shí)，PDSN是一個(gè)基本單元。其作用是支持分組數(shù)據(jù)業(yè)務(wù)，在分組數(shù)據(jù)的會(huì)話過程中，執(zhí)行下列主要功能：
　　1、建立、維護(hù)和終斷用戶的PPP會(huì)話；
　　2、支持簡(jiǎn)單和移動(dòng)IP分組業(yè)務(wù)；
　　3、通過無(wú)線分組接口建立、維持和終斷與無(wú)線網(wǎng)絡(luò)的邏輯鏈接；
　　4、進(jìn)行移動(dòng)臺(tái)用戶到AAA服務(wù)器的認(rèn)證、授權(quán)和計(jì)費(fèi)；
　　5、接受來自AAA服務(wù)器的對(duì)于移動(dòng)用戶的服務(wù)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(zhuǎn)接到AAA服務(wù)器的使用數(shù)據(jù)等。

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