Transcript compairative_study_gsm_cdma_gprs

Comparative Study
on
GSM,GPRS & CDMA Technology
Global System for Mobile Communications (GSM)
INTRODUCTION
GSM is a mobile telephony network based on the cellular
concept.
Users can place and receive calls without being fixed to a
specific location or wired to a physical connection.
To supply this capability, a GSM network consists of four
Basic components:
•The Mobile Station (MS).
•The Base Station Subsystem (BSS).
•The Network and Switching Subsystem (NSS).
•The Operation and Support Subsystem (OSS).
ARCHITECTURE
PSDN
AUC
ISDN
PSTN
PLMN
VLR
HLR
NSS
EIR
MSC
A Interface
BSC
OSS
Abis interface
BTS
UM interface
MS
SIM
1)Mobile Station- A Mobile Station consists of two main
elements i.e mobile equipment or terminal and
Subscriber Identity Module (SIM).
2) The Base Station Subsystem -The BSS connects the
Mobile Station and the NSS.

3) The Network and Switching Subsystem-Its main role is
to manage the communications between the mobile users
and other users, such as mobile users, ISDN users etc.

4) The Operation and Support Subsystem (OSS)-The OSS
is connected to the different components of the NSS and to
the BSC, in order to control and monitor the GSM system.
FUNCTIONS
1)Transmission.
2)Radio Resources management (RR).
3)Mobility Management (MM).
4)Communication Management (CM).
5)Operation, Administration and Maintenance (OAM).

SERVICES
1) Teleservices.
2) Bearer services.
3) Supplementary Services
GENERAL PACKET RADIO SERVICE (GPRS)
INTRODUCTION
General Packet Radio Services (GPRS) is a standardized
packet switched data service for GSM.
The GPRS provides us with:
1) Fast coverage rollout, adding packet switching nodes to an
existing GSM network.
2) Efficient use of scarce radio resources
GPRS design is to support burst data transfer.
Two new elements are added to keep packet data traffic
separated from traditional GSM voice and data.
i.e. a) The Serving GPRS Support Node (SGSN)
b) The Gateway GPRS Support Node (GGSN).
The migration path from GSM to GPRS requires:
a) Additional packet switching nodes
b) Software upgrades in the base station subsystem
c) Transmission links can be reused
d) Station Controllers (BSCs) for both GSM and GPRS.
ARCHITECTURE
PSTN/SST
BTS
MSC
Internet
BSC
IP
Network
Notebook
BTS
SGSN
IP BASED
GPRS
BACKBONE
Cisco
GGSN
Data Transfer Time { in seconds}
GSM {9.6 Kbps} GPRS {56 Kbps}
E-mail
25
4
Web Page
42
7
Photo
83
14
Microsoft Word
250
43
Microsoft PowerPoint
833
143
Audio clip
1,667
286
Video clip
3,333
571
Data Transfer Comparison
ADVANTAGES
Faster Data Transfer Rates
Always-On Connection
Robust Connectivity
Broad Application Support
Security Support
CODE DIVISION MULTIPLE ACCESS (CDMA)
INTRODUCTION
CDMA is a "spread spectrum" technology, allowing many
users to occupy the same time and frequency allocations in
a given band/space.
The spectral spreading of the transmitted signal gives to
CDMA its multiple access capability.
CDMA is a form of Direct Sequence Spread Spectrum
communications
ARCHITECTURE
Public Wired
Phone
network
(PSTN)
Wireline
Telephone
Base
Stations
Mobile
Station
Switch
Base
Stations
Controller
Other Cellular
Switches
Intelligent Add
on Functions
& Databases
BENEFITS
Outstanding Voice and Call Quality
Greatest Coverage for Lower Cost
Packet Data
Longer Talk Time, Longer Battery Life and
Smaller Phones
Fewer Dropped Calls
Improved Security and Privacy
Contd
…
Greater Capacity
Reduced Background Noise and Interference
Rapid Deployment
CONCLUSION
GSM has been the catalyst in the tremendous shift in
traffic volume from fixed networks to mobile networks.
GPRS cost is less than circuit- switched services since
communication channels are being used on a shared basis
and also the packets are need-based rather than dedicated
only to one user.
CDMA, for Code Division Multiple Access, is different
than those traditional ways in that it does not allocate
frequency or time in user slots but gives the right to use
both to all users simultaneously.
Thank you !!!
National Institute of Science & Technology
Comparative Study on GSM,GPRS & CDMA Technology
Jyoti Ranjan Panda
IT200118048
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