gprs vs edge
TRANSCRIPT
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FLOW OF PRESENTATION
1 GPRSINTRODUCTIONFEATURESARCHITECTUREMODULATION-GMSKMOBILITY MANAGEMENTSERVICES
2. EGPRSINTRODUCTIONMODULATION IMPLEMENTATION
3.COMPARISON4 CONCLUSION
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INTRODUCTION
•What is GPRS?
•Uses Packet Switching
•Multi-User Sharing
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FEATURES
• High Speed (Data Rate 14.4 – 115 kbps).
• Efficient use of radio bandwidth.
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FEATURES
• Internet on the Mobile
• Billing based on volume of data transferred
• Constant connectivity.
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GPRS ARCHITECTURE
User data & Signaling data
Signaling data
BTS
BTSMS
BSC Gb
SGSN
Gf
GsGr
DEIR
MSC/VLR
HLR
Gc
Gn
GGSNGi
PDN
Gp GGSN
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GMSK
•GMSK=FSK.
Data
Modulated signal
1 10 0
f0 f0 f1 f1
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MOBILITY MANAGEMENT
• Introduction
•Purpose
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STATE MODEL
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LOCATION UPDATE
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ROUTING UPDATE
• Intra-SGSN RAU
• Inter-SGSN RAU
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SERVICES
PRODUCTIVITY INFORMATION
ENTERTAINMENTCOMMUNICATION
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INTRODUCTION
•EDGE = Enhanced Data rates for GSM Evolution.
•EDGE is an extension to GPRS
EDGEGPRS EGPRS
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MODULATION USED
• 8-PSK
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3∏ /8 solves the requirement for infinite dynamic range on the power.
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EDGE IMPLEMENTATION
Downlink
uplink
Class Downlink uplink
A 8PSK GMSKB 8PSK 8PSK
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•EGPRS introduces changes to GPRS only on the base station system part of the network.
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DATA
DATA
TRANSMISSION RATEpractical data rate 115 Kbps theoretical up to 171.2 Kbps
practical data rate 384 Kbpstheoretical up to 473.6 Kbps
GPRS
EGPRS
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TRANSMISSION TECHNIQUE
•GPRS - Packet Switching.
•EGPRS – Packet Switching+Link Adaptation
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PACKET SWITCHING
•Message = packet1+packet2+………
Typical packet format
HEADER
USER DATADEST
IDSOURCE ID
MSG ID PCKT ID
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P3P2
P1 P2 P3
P1N1
T3
N2
N3
T4
T2 T1
H2
H4
H5
H3
H1
N4
P1 P2P3
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LINK ADAPTATION
•Uses MCS - radio link quality.
•Downlink- MSUplink - BS
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MODULATION USED
•GPRS------------ GMSK.
•EGPRS---------- GMSK and 8-PSK.
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CODING SCHEMES
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PACKET HANDLING
•In GPRS, Re-segmentation is not possible.
•In EGPRS, Re-segmentation is possible.
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INTERLEAVING
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OTHER FACTORS
• Addressing Window
• Modulation Bit Rate
• User Handling Capacity
• Spectral Efficiency
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SERVICESServices GPRS EGPRS
MMS
Audio/VideoStreaming
VideoMessaging
FileDownloads
VideoTelephony
BEST FITTED TECHNOLOGY
MODERATETECHNOLOGY
NOT AVAILABLE
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CONCLUSION
• EGPRS- the BETTER ONE
• FUTURE = EGPRS
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