Basic Concepts of Gsm vs gprs

1. PRESENTED BY:
GAURAV BISWAS
BIT MESRA
OVERVIEW OF MOBILE
COMMUNICATION
GSM VS GPRS

2. CONTENT
10/4/2019
 INTRODUCTION OF GSM
 GSM ARCHITECTURE
 INTRODUCTION OF GPRS
 GPRS ARCHITECTURE
 DIFFERENCE B/W GSM AND GPRS
 CHANNEL IN GPRS
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3. INTRODUCTION OF GSM
10/4/2019
 GSM(Global system of mobile
communications),was developed in year
1992(Europe)
 It makes efficient use of Spectrum
 Easy installation
 Low cost of infrastructure
 Enhance security features
 GSM offers voice and low data rate services
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4. GSM ARCHITECTURE
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SI
M
ME
MS
S
SI
M
ME
MS
S
BTS
BTS
BS
C
OSS
OM
C NMC
NSS
EIR
MSC
HLR VLR
AuC
MSC
VLR
PSTN
ISDN
Other
n/w
Fig. Reference:wireless communication book –Sanjay Kumar

5. GSM subsystem
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 GSM supports hierarchical architecture
 MSS(Mobile station subsystem)
 BSS(base station subsystem)
 NSS(Network and switching sub sytem)
 OSS(operating subsystem)

6. INTRODUCTION OF GPRS
10/4/2019
 GPRS( General Packet Radio Services) is packet
oriented mobile data service
 Step between 2G and 3G cellular system
 More efficient use of network resources(data
actually transmitted)
 It facilitates ‘always ON’ connection
 It is well suited for multi user scenario
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7. GPRS ARCHITECTURE
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
MSS
SI
M
ME
MSS
SI
M
ME
BSS
BT
S
BS
C
MSC/VLR
SGSN
HLR/GR
SMS-
GMSC
SMS-
IWMSC
SM-SC
GGSN
Other
n/w
SGSN Other
n/w
GGSN
EIR
Fig reference:wireless communication book –
Sanjay kumar

8. DIFFERENCE B/W GSM AND
GPRS
10/4/2019
PARAMETERS GSM
GPRS
 Transmission Circuit Switch Packet
Switch
 Max.Trans.Rate 14.4 kbps
114kbps(data)
 Resources less efficient use more
efficient use
 Access Time Long Short
 Charging duration based volume
based ‘always on’
 System generation 2G 2.5G8

9. LOGICAL CHANNELS IN GPRS
10/4/2019
Channels Group sub channels
Direction
PBCCH PBCCH(packet broadcast
BS->MS
broadcast control channel)
Packet PCCCH PPCH(packet paging
channel) BS->MS
Data PRACH(packet random
access) BS<-MS
Channel PNCH(notification channel)
BS->MS9

10. Function Of GPRS
10/4/2019
 Broadcast channels:
Packet Broadcast Central Channel (PBCCH)-
Broadcasts information - power control parameters, access
methods and operational modes, network parameters,
required to set up calls.
 Common control channels:
Packet Paging Channel (PPCH)-used for control
signalling prior to the call set up
Packet Access Grant Channel (PAGCH)-telling the
mobile which traffic channel has been assigned
Packet Notification Channel (PNCH-used to alert
mobiles that there is broadcast traffic intended for a large
number
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11. Function Of GPRS
10/4/2019
 Dedicated control channels:
Packet Associated Control Channel (PACCH): Used
for control signalling while a call is in progress
Packet Timing Advance Common Control Channel
(PTCCH): used to adjust the timing advance, messages
arrive at the correct time at the base station
 Dedicated traffic channel:
 Packet Data Traffic Channel (PDTCH):used to send
the traffic and it is present in both the uplink and downlink
directions, provide high speed data.
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12. Reference
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 Wireless communication by Dr. Sanjay Kumar
 Internet

13. 10/4/2019
THANK YOU!
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