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

• Email

• 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