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| Overview |
Psiren enables one to rapidly wake a network of sleeping nodes. To
decrease power, most sensor nodes sleep most of the time and wake periodically
to check for incoming network traffic. Thus, in case of an emergency, the time
to receive a wake-up message is inversely proportional to the sleep
interval. Multi-hop networks are even more difficult to wake up because the
dynamics of a network flood is dramatically slowed by neighborhood collisions
and MAC delays; a 10-hop network can take 25 times the sleep interval to wake up.
This can cause problems for mission critical deployments where a single event
should trigger a rapid response from the entire network. For example, in a
network that monitors Washington D.C. for chemical weapons, a single detection
should trigger the entire network to immediately identify the geographical
boundaries and the likely source of the chemical. Until now, the response time
of the network has been inversely proportional to the sleep interval, and
therefore the lifetime of the network. Psiren modifies the MAC policies so that
the wake-up message propagates as quickly as possible and then wakes the entire
network in parallel. Preliminary results show that this system can wake a
multi-hop network in little more than a single wake interval.
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| Publications |
Jiakang Lu and Kamin Whitehouse.Psiren: Rapid Wakeup in Unsynchronized, Low-duty Cycle Wireless Sensor Networks. Under submission. |
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Kamin Whitehouse Computer Science Department The University of Virginia 217 Olsson Hall Charlottesville, Virginia 94720 |