Gprs

1. GPRS
Asst.Prof. Rupali Lohar
Dept. of Computer Science & Engineering
B. R. Harne College Of Engineering & Technology, Karav, Post Vangani (W Tal
Ambernath, Mumbai, Maharashtra 421503

2. INTRODUCTION
existing cellular data services do not fulfill the needs of users and providers.
From the user's point of view
• Data rates are too slow, Connection speeds that have a restriction at a maximum rate
of 14.4Kbits/sec for most networks.
• The connection setup takes too long and complicated
• The service is too expensive

3.  From the technical point of view
• The drawback results from the fact that current wireless data services are based
on circuit switched radio transmission.
• A complete traffic channel is allocated for a single user for the entire call period
and this results in a highly inefficient resource utilization.
• In circuit switched services, billing is based on the duration of the connection

4. Packet switched bearer services result in a much better
utilization of the traffic channels.
 A channel will only be allocated when needed and released
immediately after the transmission of the packets.
With this principle, multiple users can share one physical
channel.
In order to address the inefficiencies, General Packet
Radio Service (GPRS) have been developed

5. What is GPRS?
• It applies a packet radio principle to transfer user data packets in an
efficient way.
• This principle offers a more user-friendly billing than that offered by
circuit switched services.
• User can be "online" over a long period of time but will be billed based
on the transmitted data volume.

7. GSM to GPRS

8. GPRS Architecture..
Uses gsm architecture+ gsn(gprs support nodes)
Sgsn(servicing gsn)
Ggsn ( gatewaygsn)
Uses packet switching
Faster than gsm and cdma

10. 1.2. GPRS access interfaces and reference
points
Gi reference point
GPRS network 1
GPRS network 2
PDNs or
other networksTE MT
Gp
UmR reference point
MS
•GPRS provides packet switched connections from
MS to packet data networks (PDN)
•Different operator’s GPRS networks are connected
through Gp interface

11. 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)

12. 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

13. 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
Filters end user traffic
Performs authentication

14. HAVING 4 SUBSYSTEMS
GPRS
BSS
NSS
RSS
GSS

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

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

17. RADIO STATION SUBSYSTEM
Consist of a number of ms, bts &bsc’s
Ms having gprscapability
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

18. Applications of GPRS
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Textual and Visual Information
Still Images
Web Browsing
Document Sharing
Corporate Email
Internet Email
Vehicle Positioning
File Transfer