Anti-Jamming for Embedded Wireless Networks
Penn collection
Degree type
Discipline
Subject
wireless networks
jamming
security
fault-tolerant systems
embedded systems
jamming
protocols
random processes
statistical analysis
synchronisation
telecommunication congestion control
telecommunication network reliability
wireless sensor networks
WisperNet time-synchronized protocol
anti jamming protocol
battery life maximization
censorship-to-link utilization ratio
communication protocol
contention-free communication
coordinated temporal randomization
electromagnetic jamming
embedded wireless network
energy-constrained wireless sensor network
link layer slot duration
link layer slot schedule
malicious jamming
node scheduling
random jammer
spatio-temporal pattern
statistical jammer
Anti-jamming
MAC protocol
wireless sensor networks
Computer Engineering
Computer Sciences
Electrical and Computer Engineering
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Abstract
Resilience to electromagnetic jamming and its avoidance are difficult problems. It is often both hard to distinguish malicious jamming from congestion in the broadcast regime and a challenge to conceal the activity patterns of the legitimate communication protocol from the jammer. In the context of energy-constrained wireless sensor networks, nodes are scheduled to maximize the common sleep duration and coordinate communication to extend their battery life. This results in well-defined communication patterns with possibly predictable intervals of activity that are easily detected and jammed by a statistical jammer. We present an anti-jamming protocol for sensor networks which eliminates spatio-temporal patterns of communication while maintaining coordinated and contention-free communication across the network. Our protocol, WisperNet, is time-synchronized and uses coordinated temporal randomization for slot schedules and slot durations at the link layer and adapts routes to avoid jammers in the network layer. Through analysis, simulation and experimentation we demonstrate that WisperNet reduces the efficiency of any statistical jammer to that of a random jammer, which has the lowest censorship-to-link utilization ratio. WisperNet has been implemented on the FireFly sensor network platform.