Shulou(Shulou.com)06/01 Report--

Gi interface Gi interface is the interface between GPRS and external packet data network (GGSN and PDN interface in GPRS network), as well as terminal IP

The address is at the presentation point of the external data network. GPRS interconnects with various public packet networks such as Internet or ISDN through the Gi interface. The functions of all users and control planes are handled based on the terminal IP layer. The terminal mobile performance of all 3GPP categories is processed before the Gi interface. On the Gi interface, it is necessary to carry out protocol encapsulation / decapsulation, address translation (such as private network IP address translation to public network IP address translation), user access authentication and authentication. Because GPRS can support a variety of data networks, Gi is not a standard interface, but just a reference point.

Gn interface Gn interface is the interface between SGSN and SGSN in the same PLMN and the interface between SGSN and GGSN is the Gn interface (the interface between SGSN in GPRS network). The interface protocol supports the transmission of user data and related signaling, and supports mobility management (MM). The interface uses TCP/IP protocol. Gn provides data and signaling interfaces, and Gn (and Gp) interfaces use GPRS Channel Protocol (GTP) in IP-based backbone networks. GPRS tunneling Protocol (GTP) is defined on both Gp and Gn platforms between GSNs in GPRS networks.

Gb interface the interface between SGSN and BBS is the Gb interface (SGSN and BSS interface in the GPRS network). Through the interface SGSN, the communication with BSS system and MS is completed to complete the functions of packet data transmission, mobility management and session management. This interface is a required interface for GPRS networking. The interface protocol can be used to transmit signaling and traffic information. Through the flow control provided by the network service based on frame Relay (Frame Relay), the frame Relay network or point-to-point frame Relay connection can be used to communicate between SGSN and BSS. Support mobility management functions and session functions, such as GPRS attachment / separation, security, routing, activation / deactivation of data connection information, etc., as well as packet data transmission from MS to SGSN through BSS.

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