compairative study gsm cdma gprs
TRANSCRIPT
Comparative Study
on
GSM,GPRS & CDMA Technology
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).
Global System for Mobile Communications (GSM)
ARCHITECTURE
PLMNPLMN
ISDNISDN
PSDNPSDN
PSTNPSTN
SIMSIM
OSSOSS
AUCAUC
HLR EIREIR
MSCMSC
VLRVLR
BSCBSC
BTSBTS
NSS
A Interface
Abis interface
UM interface
MSMS
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
INTRODUCTION
GENERAL PACKET RADIO SERVICE (GPRS)
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
IPNetwork
Internet
PSTN/SST
IP BASEDGPRS BACKBONE
Cisco GGSN
MSC
SGSNBTS
BTS
BSC
Notebook
Data Transfer Time { in seconds}
GSM {9.6 Kbps}
Web Page
Photo
Microsoft Word
Microsoft PowerPoint
Video clip
Audio clip
25
42
43
286
GPRS {56 Kbps}
83
833
3,333
250
1,667
4
14
143
571
7
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
Public Wired Phone network (PSTN)
Public Wired Phone network (PSTN)
Mobile Station
Base
Stations
Base Stations
Controller
Switch
Wireline Telephone
Other Cellular Switches
Intelligent Add on Functions &
Databases
ARCHITECTURE
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.
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