Introduction of GPRS network Elements - GPRS (General Packet Radio Service) represents an evolution of the GSM standard, allowing data transmission in packet mode and providing higher throughputs as compared with the circuit-switched mode. |
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You are here: DIME Home > Programming and Scripting > Introduction of GPRS network Elements
GPRS (General Packet Radio Service) represents an evolution of the GSM standard, allowing data transmission in packet mode and providing higher throughputs as compared with the circuit-switched mode.
Author: Venkatesh Pai
Date: Sep 23, 2009 - 10:52:21 AM
GPRS
(General Packet Radio Service) represents an evolution of the GSM standard,
allowing data transmission in packet mode and providing higher throughputs as
compared with the circuit-switched mode. This evolution is usually presented
under the designation of 2.5G to point out that it is a transition technology
between 2G and 3G.
The GPRS
network architecture reuses the GSM network nodes such as MSC/VLR, HLR, and
BSS. New network nodes have been introduced for the transport of packet data.
These nodes are the gateway GPRS support nodes (GGSN) and serving GPRS support
nodes (SGSN). The sub network formed by the SGSNs and the GGSNs is called the
GPRS core network. In order to reuse the GSM nodes, new interfaces have been
defined between the GSM network nodes and the different elements of the GPRS
core network.
GPRS network has the
following interfaces
1. SGSN -
The SGSN is the node that is
serving the MS; it is responsible for GMM. It delivers packets to the MSs and
communicates with the HLR to obtain the GPRS subscriber profile. It manages the
registration of the new mobile subscribers in order to keep a record of their
LA for routing purposes. The SGSN can be connected to one or several BSSs.
2. GGSN -
The GGSN provides inter working
with external packet data networks (PDNs). It may be linked to one or several
data networks. It is connected with SGSNs via an IP-based GPRS backbone
network. The GGSN is a router that forwards incoming packets from the external
PDN to the SGSN of the addressed MS. It also forwards outgoing packets to the
external PDN. The PDN is the external fixed data network to which is connected
the GPRS network. An example of a PDN is the Internet network.
3. HLR -
The HLR is a database that
contains, among other things, packet domain subscription data and routing
information.
4.
5. BSS
- The BSS ensures the radio connection between the mobile and the
network. It is responsible for radio access management. The BSS is composed of
two elements: the BTS and the BSC. The BTS integrates all the radio
transmission and radio reception boards. The BSC is responsible for the
management of the radio channels. The BSC has switching capabilities that are
used for circuit-switched calls and can also be used for GPRS traffic.
6. EIR
- The EIR is a database that
contains terminal identities.
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