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natural disasters

For emergency communication without power, use the ‘fog’

For natural disasters that knock out power—and therefore the internet—researchers have devised a new way of gathering and sharing information that doesn’t rely on electricity.

Using computing power built into mobile phones, routers, and other hardware, emergency managers and first responders will be able to share and act on information gathered from people affected by hurricanes, tornados, floods, and other disasters.

“Increasingly, data gathered from passive and active sensors that people carry with them, such as their mobile phones, is being used to inform situational awareness in a variety of settings,” says Kishore Ramachandran, a computer science professor at Georgia Tech.

“In this way, humans are providing beneficial social sensing services. However, current social sensing services depend on internet connectivity since the services are deployed on central cloud platforms.”

In a paper presented earlier this year at the 2nd International Workshop on Social Sensing, researchers detailed how it may be possible to access centralized services using a decentralized network that leverages the growing amount of computing power at the “edge” of the internet.

The ability will give first responders a huge advantage.

In a flooded area, for example, search and rescue personnel using a geo-distributed network would be able to continuously ping enabled phones, sensors, and other devices in an area to determine exact locations. The data is used to create density maps of people in that search region. The maps would then be used to prioritize and guide emergency response teams.

‘Fog’ or ‘edge’ computing

The proposal takes advantages of edge computing. Also known as fog computing, edge computing places more processing capabilities in sensing devices—like surveillance cameras, embedded pavement sensors, and others, as well as in consumer devices like cell phones, readers, and tablets—in order to improve network latency between sensors, apps, and users.

Rather than just being able to communicate through the internet with central cloud platforms, the researchers demonstrated that by harnessing edge computing resources, sensing devices can be enabled to identify and communicate with other sensors in an area.

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“We believe fog computing can become a potent enabler of decentralized, local social sensing services that can operate when internet connectivity is constrained,” Ramachandran says.

“This capability will provide first responders and others with the level of situational awareness they need to make effective decisions in emergency situations.”

3 components

The team has proposed a generic software architecture for social sensing applications that is capable of exploiting the fog-enabled devices. The design has three components—a central management function that resides in the cloud, a data processing element placed in the fog infrastructure, and a sensing component on the user’s device.

It’s not enough to simply run a centralized social sensing service on a number of parallel fog nodes, the researchers say.

“Rather, the social sensing service has to become a distributed service capable of discovering available fog nodes and building a network that aggregates and shares information between social sensors that are connected to different fog nodes,” says computer science PhD student Harshit Gupta.

Beyond emergency response during natural disasters, the proposed fog architecture can also benefit communities with limited or no internet access. These include applications for public transportation management, job recruitment, and housing.

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Another possible application of the new approach is monitoring sensing devices in remote areas.

To monitor far-flung devices in areas with no internet access, a bus could be outfitted with fog-enabled sensing capabilities. As it travels in remote areas it would collect data from sensing devices. Once in range of internet connectivity, the “data mule” bus would upload the information to the centralized cloud-based platforms.

“In places that did not benefit from the first wave of cloud-based social sensing services, our hope is that these communities can leapfrog having to rely solely on the internet and directly use fog-based services,” Ramachandran says.

Source: Georgia Tech

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