Transcript Slide 1

The LNM Institute of Information Technology Jaipur
General Packet Radio Service
(GPRS)
Vishwanath Sinha
www.powerpointpresentationon.blogspot.com
© GPRS
The LNM Institute of Information Technology Jaipur
Data Services over GSM(phase1):
• Short Message Service (SMS) : The SMS allows the mobile
terminal to send and receive short messages of upto 160
characters (7-bit ASCII). Messages are routed via the control
channel (which is normally used for signaling purposes)
• Circuit Switched Service :The data is sent on the normal
traffic channel (TCH).
TCH : 13 kbps full rate encoded voice/
9.6 kbps data
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The LNM Institute of Information Technology Jaipur
Disadvantage of the Circuit - Switched Service
• A maximum of 9.6 kbps data rate
• Inefficient utilization of radio interface (as data traffic is bursty
in nature); Inefficient resource management
• Customer pays for the connection time and not for the volume
of data transferred (or usage).
• Long call set up time
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The LNM Institute of Information Technology Jaipur
Data traffic is increasing.This is a worldwide phenomena:
Internet browsing one of the principal attributes
It has already crossed the voice traffic in several countries
It is desirable to have higher bandwidth and efficient
services using existing network.
In principal, three alternatives for higher than 9.6 kbps
data rate:
• High -Speed Circuit-Switched Services (HSCSD)
• General Packet Radio Service (GPRS)
• Enhanced Data Rate for GSM Evolution (EDGE)
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High Speed Circuit Switched Services (HSCSD)
• Provides higher bandwidth to users
- upto 57.6 kbps by using 4 time slots (TCH) of a carrier
frequency
- 14.4 kbps per channel by new channel coding scheme.
• Efficient and flexible use of higher bandwidth possible.
Implementation requires changes in channel allocation,
connection setup, handover procedures and interworking
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General Packet Radio Service (GPRS)
• A packet-switched service concept for data transfer
• Standardized to support wide range of application from very
frequent transmission of medium to large data volumes.
• Only little modification in existing GSM components (GPRS
offers a packet, switched service alongside existing circuitswitched data services)
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GPRS Provides
• A service for bursty and bulky data transfer
• Use of radio resources only on demand
• Shared use of physical radio resources
• Maximum use of existing GSM functionality
• Cost effective (depending on volume of data transferred) billing
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GPRS Applications
(Ability to maintain voice and data communications while on move.)
Point-to-Point (PTP)
• Messaging (e.g.. Email)
• Remote access to Corporate
networks
• Access to Internet
• Credit card validation (point of
sale)
• Utility meter reading
• Road toll applications
• Automatic Traffic control
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Point-to-Multipoint(PMP)
• PTM- Multicast (send to all)
• News
• Traffic
• Information
Weather forecast
• Financial updates
PTM–Group Call (send to some)
Taxi / fleet
management
Conferencin
g
The LNM Institute of Information Technology Jaipur
Where GPRS is (will be) applicable ?
Market can be segmented according to the end-user
Requirement
Sales
Services
Business Corporate
and Small Companies
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Logistics
Consumer
Vertical
Horizontal
The LNM Institute of Information Technology Jaipur
Horizontal Market
Business
• facsimile
• e-mail
• messaging
• file transfer
• mobile office
• e-commerce
• video conferencing
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Consumer
• e-mail
• Internet browsing
• News
• e-commerce
• entertainment
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Vertical Market
Operations
• Fleet management
• taxi services
• good/supply logistics
• emergency services
• Police
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Maintenance
• Vending machines of all
kinds
• Alarm and supervision
• point to sales
• telemetry
• Vehicle tracking
• electronic ma
• traffic telematics
The LNM Institute of Information Technology Jaipur
Compare it with the usual GSM Network. New functional network
element in GPRS are:
• Seving GPRS Support Nodes(SGSN) : Provides the mobile
stations with functional support. It performs security functions
and access control. SGSN is connected to BSS with frame
Relay.
• Gateway GPRS Support Nodes(GGSN) : Serves as the interface
to external networks. This node is accessed by Packet Data
Network (PDN). It contains routing information. This is where
the packet data protocol are analyzed for routing to respective
MS.
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Basic GPRS Infrastructure
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GPRS Logical Architecture
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GPRS System Architecture
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Routing in GPRS
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Routing in GPRS
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Protocol Layers in GPRS System
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Frame Structure in GPRS
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Coding of an information frame
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GPRS-Internet Connection
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Modification Required for GPRS
GSM Network
Element
Subscriber
Terminal
(TE)
BTS
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Modification or Upgrade Required for GPRS
A totally new subscriber terminal is required to
access GPRS services.These new terminals will
be backward compatible with GSM for voice
calls.
A software upgrade is required in the existing
base transceiver site (BTS)
The LNM Institute of Information Technology Jaipur
The base station controller (BSC) will also require
a software upgrade,as well as the installation of a
BSC
new piece of hardware called a packet control
unit(PCU).The PCU directs the data traffic to the
GPRS network and can be a separate hardware
The
deployment
of GPRS
requires
element
associated
with the
BSC the installation
Core
of new core network elements called the Serving
Network
GPRS Support Node(SGSN) and Gateway GPRS
Support NODE(GGSN)
Databases All the databases involved in the network will
(VLR,HLR, require software upgrades to handle the new
and so on) call models and functions introduced by GPRS.
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GPRS Limitations
• Limited cell capacity for all users
• Speed much lower in reality
• Support of GPRS mobile terminate by terminals is not
• Suboptimal modulation
• Transit delays
• No store and forward
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References
• “Wireless Internet Access Based on GPRS”, Roger Kaldey Iugo
Meirick and Michael Meyer; IEEE Personal communication, ch.
8-18 ;April 2000
• http://www.comsoc.org/pubs/surveyes/sq99issue/bettsteller.html
• GSM world http://www.gsmworld.com
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