Disaster Communication Method Using Electromagnetic Wave Leaking from Wireless LAN System to Outdoors

Wireless network technology has been well developed and used for various applications in the world. Particularly in resident area, most people use Wi-Fi system such as IEEE802.11a. b. g. n system as access lines to Internet. However, since most of the residents leak their electromagnetic waves to neighbor without any security keys, the network security problems have become serious in resident areas. On the other hand, large scale disasters in metropolitan areas as well as country side area in Japan are anticipated. In those cases of natural disasters information infrastructure must be preserved to keep the safe life for residents. In this paper, we propose a disaster communication network method based on leaked wave from resident wireless LANs system. The leaked waves outdoor from each resident can be used as urgent information infrastructure on which not only residents but public officers can also use to transmit the disaster information, resident safety information, evacuation information each other through Internet. We investigated practical feasibility of the disaster communication network by the leaked wave by evaluating the throughput, round trio time in actual resident area in Japan. Throughput this performance evaluation, we could verify the feasibility of our suggested disaster network method.