Disasters like tsunami, cyclone, earthquake or war, both natural and manmade are very common in human life. We cannot prevent them, but we can be better prepared to cope up with the disasters and take necessary steps to reduce the post disaster aftermath.  The consequences of disaster are: 

• Massive destruction of life, civilian displacement and separated families leaving in need of food, shelter and healthcare services.
• The communication infrastructures are often seriously damaged or destroyed.

So a communication network should be available and accessible immediately after the disaster to support the post disaster rescue and recovery activities.

Categorization of technologies

We have tried to categorize the technologies based on the range of coverage are. Some other features like portability, connectivity to the internet and available services also have been added.

• Short Coverage Area Networks
• Medium Coverage Area Networks
• Large Coverage Area Networks