This section follows the evolution from GSM to GPRS, stressing the
differences between packet switched and circuit switched data modes.
An overview of the network architecture is included with its
connections to GSM and other data networks.
In this section we cover the various services available as a result
of the introduction of GPRS systems. These services include
point-to-point services, point to multi-point services, GPRS
supplementary services, GSM short message services (SMS), together
with a description of Anonymous access.
Short Message Service (SMS)
Topics covered in this section are the SMS architecture and
functionality together with the features of SMS, addressing of
messages, Mobile Originated (MO) and Mobile Terminated (MT) short
messages, delivery confirmation and interworking.
GPRS Network Architecture
In this section we describe the functions of the GPRS network
elements - including the Gateway GPRS Support Node (GGSN), the
Serving GPRS Support Node (SGSN), and the Base Station Sub-System
(BSS). Also covered are the GPRS backbones and the functionality of
the HLR and the Point to Multi-point service centre (PTM-SC).
Mobility Management (MM)
This section describes the GPRS MM states, routing areas, the
interaction between SGSN and MSCs , GPRS attach, Paging, Routing
Area and cell updates.
Here we describe the GPRS ‘over the air’ security aspects, screening
of data, Point to Multi-point security and GPRS Backbone security.
The Air Interface
Starts with a brief review of the GSM Air Interface on which the
GPRS Interface is based. Then introduces the Logical/Physical
channels, covering their relationship to each other and the
assignment of channels.
Packet Data Transfer
This section covers the transmission plane protocols, such as
TCP/IP, Frame Relay, and the less generic GPRS protocols - including
the GPRS Tunnelling Protocol, Sub-network Dependent Convergence
Protocol, Logical Link Control, Radio Link Control and Media Access