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.

翻译：生命线是设计用于移动电话和电池动力无线路由器的一组系统,用于建立应急特设网络;在自然灾害期间没有手机信号或手机信号中断时,生命线程序安装的装置可自动形成临时网络;例如,大规模地震可对陆基电信基础设施造成巨大损害;在这种情况下,用生命线程序安装的移动电话可用于向被困在倒塌的建筑物中的受害人发送紧急信息;此外,生命线还为救援人员提供了一个功能,使其能够根据网络传播技术估计受害者的位置;生命线还有能力从部分网络崩溃和节点丢失中恢复过来。