Timothy X Brown

1
Wireless Communications Test Bed 802.11 Ad Hoc
Networking

• Timothy X Brown
• Interdisciplinary Telecommunications
• Electrical and Computer Engineering
• University of Colorado
• Presented to L3 Comcept at the
• University of Colorado
• December 17, 2003

2
Overview

• Ad Hoc network background
• Protocol development
• Hardware platform
• 802.11
• Status

3
Ad Hoc Routing Protocols

• Routing
• Topology Discovery
• Route Choice
• Route Maintenance
• Example with Dynamic Source Routing (DSR)

4
Our Approach to Wireless Networking
Theory
Hardware
Implementation
Simulation
5
Power and Fairness

• Contention
• Battery

D
F
C
A
B
E
6
Protocol Implementation
CLICK
7
Simulation and Validation
Same code actually deployed
Can easily compare alternatives
8
Software Tools
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Hardware Testing
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Hardware Platform

• Environmental Enclosure
• Integrated Antenna
• Adjustable Gain Amp 100mW -1W
• Soekris Single Board Computer
• 133MHz
• 32MB Compact Flash Storage
• 128MB RAM
• Linux Operating System
• 802.11 card (option for second)
• GPS
• External Power
• Not for UAV version

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802.11b

• Studying
• Ground and UAV operating ranges
• Performance at very long range
• UAV as wide area network interference
• Interaction with UAV telemetry and control radio

12
Status

• Accomplishments
• Implemented and tested DSR protocol
• Personnel Identified (1.5 students)
• Experience with real 802.11 ad hoc networks
• To Do
• Port protocol to new hardware platform
• Resolve antenna placement of UAV
• Issues
• Role of UAV in ad hoc network