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PDP Context Activation은 SGSN과 GGSN의 연결이다.

PDP Context는 SGSN과 GGSN연결을 위해 사용되는 정보 집합(맥락)이다.

-PDP Type
-PDP address type
-QoS profile request(QoS parameters requested by user)
-QoS profile negotiated(QoS parameters negotiated by network)
-Authentication type(PAP or CHAP)
-DNS type(Dynamic DNS or Static DNS)

PDP Context Activation procedure는 외부에 있는 Packet Data 망(network)[GPRS망]과 패킷을 주고받기 위한 절차이다.

GPRS(General Packet Radio Service)망은 GSM(Global System for Mobile)망을 기반으로 데이터 트래픽을 전송하기 위한 2.5 Generation 이동통신 표준.(GSM에서 무선인터넷,영상통화가 추가됨)

http://blog.naver.com/cache798/130032937974

http://blog.naver.com/ktec21/80086197660

http://blog.naver.com/rudnfskfl/70043768561

WIKI

GPRS core network

http://en.wikipedia.org/wiki/GPRS_Core_Network

PDP Context

The packet data protocol (PDP; e.g., IP, X.25, FrameRelay) context is a data structure present on both the Serving GPRS Support Node (SGSN) and the Gateway GPRS Support Node (GGSN) which contains the subscriber's session information when the subscriber has an active session. When a mobile wants to use GPRS, it must first attach and then activate a PDP context. This allocates a PDP context data structure in the SGSN that the subscriber is currently visiting and the GGSN serving the subscriber's access point. The data recorded includes

• Subscriber's IP address
• Subscriber's IMSI
• Subscriber's
  • Tunnel Endpoint ID (TEID) at the GGSN
  • Tunnel Endpoint ID (TEID) at the SGSN

The Tunnel Endpoint ID (TEID) is a number allocated by the GSN which identifies the tunnelled data related to a particular PDP context.

Several PDP contexts may use the same IP address. The Secondary PDP Context Activation procedure may be used to activate a PDP context while reusing the PDP address and other PDP context information from an already active PDP context, but with a different QoS profile.^[1] Note that the procedure is called secondary, not the resulting PDP contexts that have no such relationship with the one the PDP address of which they reused.

A total of 11 PDP contexts (with any combination of primary and secondary) can co-exist. NSAPI are used to differentiate the different PDP context.