coe 543 wireless networks term project gprs capacity evaluation presented by yaser al-jarbou may...
TRANSCRIPT
COE 543 Wireless Networks
Term Project
GPRS Capacity Evaluation
Presented By
Yaser Al-Jarbou
May 2004
May 2004GPRS Capacity Evaluation
Agenda
• Introduction
• GSM/GPRS Technology
• Simulation Model
• Results Discussion
• Reference Paper
• Conclusion
May 2004GPRS Capacity Evaluation
GPRS
• GPRS: General Packet Radio Service
• GPRS is a service that provides packet mode transmission within the GSM network & interconnects with external packet data networks.
May 2004GPRS Capacity Evaluation
What is GPRS?
• 2.5 G
• GPRS is an overlay network over the GSM
• Very Little change to GSM infrastructure
• Provides Data Packet delivery service
• Standardized by ETSI
• Direct support for Data Network
May 2004GPRS Capacity Evaluation
Applications
• Web browsing
• Banking Transactions
• Stock Market Updates
• News
• Weather & Traffic reports
May 2004GPRS Capacity Evaluation
Features
• High Data Rates of about 100 kbps – an order of magnitude higher than GSM
• The setup time is negligible – less than a second
• Resource utilization as per requirements – air interface is assigned temporarily on per-packet basis
• Hosts can remain “always on”
May 2004GPRS Capacity Evaluation
GSM Architecture
May 2004GPRS Capacity Evaluation
GPRS Additions
May 2004GPRS Capacity Evaluation
GPRS Additions (Cont.)
• SGSN – Serving GPRS support Node.– Performs packet routing & transfer
– Mobility management – attach/detach & location management
– Logical Link Management
– AAA
– Stores user Profiles of all MS within its purview
May 2004GPRS Capacity Evaluation
GPRS Additions (Cont.)
• GGSN – Gateway GPRS support Node– Interface between GPRS backbone & External packet data networks
– Converts GPRS packets into appropriate Packet Data Protocol & vice-versa
– It may also perform AAA
• Many-2-Many relationship may exist between SGSN & GGSN
May 2004GPRS Capacity Evaluation
Mobile Classes
Three types of Mobile Classes
• CLASS A: « Rolls Royce »
• CLASS B: « Standard »
• CLASS C: « Cheap »
CS Core Network (GSM)
PS Core Network (GPRS)
Simultaneous CS/PS PagingSimultaneous CS/PS data transfer
CS Core Network (GSM)
PS Core Network (GPRS)
Simultaneous CS/PS PagingCS call or PS data transfer
CS Core Network (GSM)
PS Core Network (GPRS)
CS mode (GSM only) or PS mode (GPRS only)
May 2004GPRS Capacity Evaluation
Project Title
• GPRS Capacity Evaluation
• Goal: Simulate the capacity needed for GPRS in coexistence with the circuit switched services.
• Reference Paper: – Peter Stuckmann, Frank Muller, “GPRS Radio Network Capacity and
Quality of Service using Fixed and On-Demand Channel Allocation Techniques”, IEEE 2000.
• Tool: Microsoft .NET C#
May 2004GPRS Capacity Evaluation
GPRS Capacity Evaluation
Carrier 1
Carrier 2
Carrier 124
.
.
.
.
.
.
CS Slot
Dynamic Slot PDCH
Fixed Slot PDCH
May 2004GPRS Capacity Evaluation
Simulation Model
May 2004GPRS Capacity Evaluation
Results Discussion
GPRS Data Throughput (Fixed)
0
500
1000
1500
2000
2500
3000
3500
4000
4500
5000
1 2 3 4 5 6 7 8 9 10
Active Users
Da
ta T
hro
ug
hp
ut
(by
te/s
)
4 PDCH
2 PDCH
1 PDCH
May 2004GPRS Capacity Evaluation
Results (Cont.)
On-Demand GPRS Data Throughput
0
500
1000
1500
2000
2500
3000
3500
1 2 4 6 8 10 12 14 16 18 20
User Stations
Da
ta T
hro
ug
hp
ut
(by
tes
/s)
4 PDCH
May 2004GPRS Capacity Evaluation
Results (Cont.)
GPRS Utilization (8 PDCH On-Demand)
0
10
20
30
40
50
60
70
80
1 2 4 6 8 10 12 14 16 18 20
Active Users
Uti
liza
tio
n (
%)
May 2004GPRS Capacity Evaluation
Conclusion
• GSM/GPRS Technology
• Simulation Model
• Results Discussion