  Lifeline is a group of systems designed for mobile phones and battery powered
wireless routers for forming emergency Ad hoc networks. Devices installed with
Lifeline program can automatically form Ad hoc networks when cellular signal is
unavailable or disrupted during natural disasters. For instance, large scale
earthquakes can cause extensive damages to land-based telecommunication
infrastructures. In such circumstances, mobile phones installed with Lifeline
program can be used to send emergency messages by the victims who are trapped
under collapsed buildings. In addition, Lifeline also provides a function for
the rescuers to estimate the positions of the victims based on network
propagation techniques. Lifeline also has the ability to recover from partial
crash of network and nodes lost.
