wireless networks kth do-it-yourself-radio: an ad-hoc user centric solution all the way down from...
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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