GPRS is a packet-based mobile data service on GSM networks. It provides higher speed data transmission than previous GSM data services. The GPRS architecture introduces two new network nodes - SGSN and GGSN. SGSN handles mobility management and packet transmission between MS and GGSN, while GGSN connects the GPRS network to external packet networks like the Internet. GPRS enhances the GSM network by allowing dynamic allocation of bandwidth and intermittent data transmission, making it suitable for bursty, low-volume data applications.

1. Prepared by:
Arpita Sanghani
14PGIT020
M.Tech-IT 2nd sem

2. Content
 What is GPRS?
 Characteristics of GPRS
 GPRS Architecture
 Support nodes of GPRS
 Network Enhancements
 GPRS interface
 Security

3. What is GPRS
General Packet Radio Service
• General -> not restricted to GSM use (DECT ?, 3rd generation
systems ?)
• Packet Radio -> enables packet mode communication over air
• Service, not System -> existing BSS (partially also NSS)
infrastructure is used
Main benefits
• Resources are reserved only when needed and charged accordingly
• Connection setup times are reduced
• Enables new service opportunities

4. GPRS Characteristics
GPRS uses packet switched resource allocation
• resources allocated only when data is to be sent/received
Flexible channel allocation
• one to eight time slots
• available resources shared by active users
• up and down link channels reserved separately
• GPRS and circuit switched GSM services can use same time
slots alternatively
Traffic characteristics suitable for GPRS
• Intermittent, bursty data transmissions
• Frequent transmissions of small volumes of data
• Infrequent transmission of larger volumes of data

5. GPRS Architecture

6. 4
GATEWAYSUB
SYSTEM
3
RADIO SUB
SYSTEM
2
NETWORK SUBSYSTEM
1
BASE
STATION
SUB
SYSTEM
BTS 1 BTS 2
BSC 1
BSC
2
MSC VLR
SGSN
TO A
NO OF
BSC
EIR
HLR
MS 1 MS 2

7. GPRS Architecture..
 Uses gsm architecture+ gsn(gprs support nodes)
Sgsn (servicing gsn)
Ggsn ( gateway gsn)
 Uses packet switching
 Faster than gsm and cdma
 Enable simultaneous transmission of packets
 SGSN and GGSN will be explain in next slide

8. GPRS support nodes
 There are two network nodes use to offer packet data
service called GPRS support nodes
1) Serving GPRS Support Node (SGSN)
2) Gateway GPRS Support Node (GGSN)

9. Serving GPRS Support Node(SGSN)
Serving GPRS Support Node(SGSN) is one of the GPRS
support node
 Routing the packet switched data to and from the ms
 Mobility management
 Location management
 Authentication and charging for calls
 Stores the location information of the user
 User’s profile

10. Gateway GPRS Support Node(GGSN)
 Provide a gateway b/w gprs & pdn
 Convert data from sgsn to pdp format( packet data
protocol)
 Store the current sgsn address
 Stores the location of user in its location register
 Perform authentication & charging functions

11. HAVING 4 SUBSYSTEMS
GPRS
BSS
NSS
RSS
GSS

12. Base Station System(BSS)
 BSS system needs to enhancement to recognize and
send packet data.
 BSS includes BTS and MS.
Network Subsystem(NSS)
 It consist of a number of sgsns
 Also consist of a number of msc
 helps in – authentication, operation & maintenance of
subsystems

13. SIM
ME
BTS
BTS
BSC
BSC
HLR HLR
HLR HLR
MSC SGSN GGSN
PSTN,
ISDN,
PSPDN
CSPD
N
BSS NSS

14. RADIO STATION SUBSYSTEM
 Consist of a number of ms, bts & bsc’s
 Ms having gprs capability
 Stores a cksn( cipher key sequence number – a logical
identity)
GATEWAY SUBSYSTEM
 Consist of sgsn & ggsn
 Provide connections to other networks & pda
 Pda – public data network

15. GPRS other components
 Home Location Register(HLR): registers user profile
and responds to queries from GSNs .
 Mobile Station(MS): it is the mobile phone or device
 SMS Nodes: used for sms transmission via the SGSN

16. Acronyms
 GPRS – GENERAL PACKET RADIO SERVICE
 MS – MOBILE STATION
 BTS – BASE TRANCEIVER STATION
 BSC – BASE STATION CONTROLLER
 MSC – MOBILE SERVICES SWITCHING CENTER
 HLR – HOME LOCATION REGISTER
 AUC – AUTHENTICATION CENTER
 EIR – EQUIPMENT IDENTITY REGISTER
 VLR – VISITOR LOCATION REGISTER

17. Conclusion
 GPRS provides efficient access to Packet Data
Networks.
 Multislot operation in GPRS leads to efficient channel
utilization.
 GPRS is more effective for long data packet
transmission than short ones.

18. References
 Mobile Computing by Ashoke k Talukder
 http://www.tutorialspoint.com/gprs/gprs_architectur
e.html
 Mobile Communications by Jochen Schiller