Wireless Networks KTH Do-it-Yourself-Radio: an Ad-Hoc User Centric Solution all the Way Down from Content Creation to Broadcast Distribution Nicolas Debernardi.

Wireless NetworksKTH

Do-it-Yourself-Radio: an Ad-Hoc User Centric Solution all the Way Down from

Content Creation to Broadcast Distribution

Nicolas Debernardi

Markus Jäger

Jean - Christophe Laneri

Malek Sraj

Advisor: Pietro Lungaro

2E1512 Wireless Networks - Project Presentation27 May 2005

Overview

• Project Goals• System Model• Performance Measures• Service Definition• Simulation Results• Conclusion

2E1512 Wireless Networks - Project Presentation27 May 2005

Project Goals

• Evaluate the feasibility of providing specific radio programs in sparse user-deployed networks with respect to user experience and infrastructure density.

• Quantify the impact of multihopping on the provision of such services.

Goals

System Model

Performance

Services

Results

Conclusion

2E1512 Wireless Networks - Project Presentation27 May 2005

Environment

Goals

System Model

Performance

Services

Results

Conclusion

• User-deployed network• Uniformly distributed access points

• Mobility model• Pedestrian

• Propagation model• Only LOS considered• Interference-free environment• Wireless LAN 802.11g

• Rate model• Ideal link adaptation (Shannon bound)• Maximum rate: 54 Mbps

2E1512 Wireless Networks - Project Presentation27 May 2005

Access Policies

• Segment: 3 min MP3 file at rate R=64 Kbps

• Access point to user communication• Bandwidth exclusively assigned to nearest user

• User to user communication• Establish connection to nearest neighbor• Stay connected within a chosen range• Fully cooperative users• No priority

Goals

System Model

Performance

Services

Results

Conclusion

2E1512 Wireless Networks - Project Presentation27 May 2005

Access Protocols (2)

System Model

Performance

Services

Results

Conclusion

2E1512 Wireless Networks - Project Presentation27 May 2005

Performance Measures

• Service cost

• Toff: time users wait before playing

• Tfail: time users have nothing new to play

• Relative gains introduced by multihopping• ΔC: service cost improvement• ΔBS: infrastructure improvement

C = Toff +Tfail

Goals

System Model

Performance

Services

Results

Conclusion

2E1512 Wireless Networks - Project Presentation27 May 2005

Service Definition (1)

• Service 1: Playlist

• Service 2: Talk Show

• Service 3: Playlist plus News

Goals

System Model

Performance

Services

Results

Conclusion

rc = 0 %

rc = 100 %

rc: percentage of critical files

rc = 25 %

2E1512 Wireless Networks - Project Presentation27 May 2005

Service Definition (2)

• Service 1: Playlist

• Service 2: Talk Show

Goals

System Model

Performance

Services

Results

Conclusion

2E1512 Wireless Networks - Project Presentation27 May 2005

Simulation Results (1)

Iso-cost system configurations for service 1

Cost range: 300 - 1500 s

Requirement: 90 % of the users satisfying the QoS

Goals

System Model

Performance

Services

Results

Conclusion

2E1512 Wireless Networks - Project Presentation27 May 2005

Simulation Results (2)

Service cost comparisonGoals

System Model

Performance

Services

Results

Conclusion

rc = 100 %

rc = 25 %

rc = 0 %

rc = 100 %

rc = 25 %

rc = 0 %

2E1512 Wireless Networks - Project Presentation27 May 2005

Simulation Results (3)

Gain of multihoppingGoals

System Model

Performance

Services

Results

Conclusion

rc = 0 %

rc = 25 %

rc = 100 %

2E1512 Wireless Networks - Project Presentation27 May 2005

Conclusion

Goals

System Model

Performance

Services

Results

Conclusion

• What multihopping offers:• Higher user satisfaction• Lower infrastructure cost

• Best service?• In terms of performance: service 1• Live vs performance: service 3

2E1512 Wireless Networks - Project Presentation27 May 2005

Questions

2E1512 Wireless Networks - Project Presentation27 May 2005

The Radio

SOSL GROOVE TRANSISTOR RADIO - IVORY

Features: - AM/FM Radio with dial light - Light On/Off switch - Volume On/Off control- Power on LED indicator- Telescopic FM antenna- Powered by: 4 x AA battery

Specs: - Output power: 250mW- Speaker: 3 inches, 8 ohm

Unit Dimensions (inches): 7.5 X 4.8 X 2.3

http://www.polyconceptusa.com

2E1512 Wireless Networks - Project Presentation27 May 2005

Communication range

Exchanged data during a meeting between users

2E1512 Wireless Networks - Project Presentation27 May 2005

Propagation model

• Dual slope model with break point at 8 m:

• Channel bandwidth: 20 MHz• Noise power: -88.98 dB

• Previously used for modeling the propagation of wireless LAN 802.11 g access points in the 2.4 GHz band

mrr

mrrrLb 8)(log335.28

8)(log202.40)(

10

10

2E1512 Wireless Networks - Project Presentation27 May 2005

Time Offset vs Failure Time

2E1512 Wireless Networks - Project Presentation27 May 2005

Service Definition (1)

• Service 1: Playlist

• Service 2: Talk Show

2E1512 Wireless Networks - Project Presentation27 May 2005

Service Definition (2)

• Service 3: Playlist plus News

2E1512 Wireless Networks - Project Presentation27 May 2005

Simulation Results (1)

Iso-cost system configurations for service 1

Cost range: 300 - 1500 s

Requirement: 90 % of the users satisfying the QoS

2E1512 Wireless Networks - Project Presentation27 May 2005

Simulation Results (2)

Iso-cost system configurations for service 2

Cost range: 300 - 700 s

Requirement: 90 % of the users satisfying the QoS

2E1512 Wireless Networks - Project Presentation27 May 2005

Simulation Results (3)

Iso-cost system configurations for service 3

Cost range: 300 - 700 s

Requirement: 90 % of the users satisfying the QoS