GPRS Network composition and interface

Source: Internet
Author: User
GPRS Network composition and interface
GB Port: SGSN through the GB port and base station BSS, for mobile MS Services. Establish a connection between SGSN and Ms through the Logical Control Protocol LLC, providing mobility management (location tracking) and security management functions. SGSN completes the protocol conversion between MS and SGSN, i.e. backbone network uses IP protocol to convert into SNDCP and LLC protocols, and provides MS authentication and registration functions.

GN Port: SGSN through the GN Port and GGSN, through the GPRS Tunneling Protocol (GTP) to establish a channel between SGSN and external data network (X.25 or IP) to achieve the interconnection between MS and external data network.

GS mouth: For SGSN to MSC/VLR send address information, and from the MSC/VLR to receive paging requests, to achieve packet-type business and the association of non-grouped business.

GR Port: HLR Save GPRS user data and routing information (IMSI, SGSN address), each IMSI also contains packet data protocol PDP information, including PDP type (X.25 or IP), PDP address and its QoS level and routing information.

GI mouth: GGSN through the GI port to achieve the GPRS network and external Data Network (PDP) interconnection. GGSN is actually two Internet gateways, GPRS itself belongs to IP domain network, GI port support X.25 and IP protocol. Viewed from the PDN network GGSN,GGSN can be seen as a router connected to the PDN network. The GGSN contains routing information for connecting GPRS users, and provides channels for the PDU of the external data network to be delivered to Ms. Through GGSN and GPRS network interconnection packet Data network PDN, can be PSPDN network, at this time, GPRS support ITU-T X.121 and ITU-T E.164 numbering Scheme provides X.25 virtual circuit and quick selection of X.25, also supports x.75 protocol connection between networks, or Internet network, based on IP protocol, GPRS supports TCP/IP header's compression function in IP datagram transmission mode.

GD Port: Sms_gmsc, Sms_inmsc and SGSN indirect port. Through this interface, SGSN can receive short message, and transfer it to MS, SGSN and SMS Service center-GMSC, through GD interface to complete the short message service on GPRS

GP Mouth: GPRS network indirect port. Using GP interface interconnection among different GPRS networks, the abbreviations are composed of gateways and firewalls.

Drx

Non-continuous receive

Em

Extended measurement

Gprs

General Packet Radio Service

Gsm

Global Mobile Communication System

Llc

Logical Link Control

Mac

Media access Control

Mm

Mobility Management

Ms

Mobile Station

Pacch

Packet along-Path control channel

Pagch

Packet Access permitted Channel

Pbcch

Packet Broadcast control channel

Pccch

Packet public control channel

Pdp

Packet Data Protocol

Pdu

Grouped data units

Pdch

Packet data channel

Pdtch

Packet Service Channel

PLMN

Public Land mobile Network

Ppch

Packet Paging channel

Prach

Packet Random access Channel

PSDN

Packet Switched Data network

Ptcch

Group Time Advance Channel

Rr

Wireless Resources

Rlc

Wireless Link Control

SI

System Information

SGSN

Service GPRS Support node

Sndcp

Subnet-dependent Convergence protocol

TBF

Temporary flow identification

TFI

Temporary flow identification

Tlli

Temporary logical link recognition

Tqi

Temporary queue recognition

USF

Uplink status Tag


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