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motion, the dispatch destination was changed to the town oce in Takamori Town during traveling.Because we used the vehicle earth stations for WINDS to move, we took the route to the dispatch destination through Tohoku, Ban-etsu, Hokuriku, San-in, Mei-shin, Sanyo and Kyushu expresses, ran the northern route around Mt. Asosan, and arrived at the town oce in Takamori Town at around 20:00 on April 18. Moreover, the total travel distance was about 1,600 km which took 30 hours.5.2Emergency network building using WINDS, and usage conditions of the networkAer adjusting with the sta of the disaster counter-measures oce of Takamori Town, we decided to build the emergency network using WINDS on April 19. We built the WINDS lines using 51 Mbps mode at around 9:00 on April 19. en, we prepared one AP of the mesh network for the government, and provided the network to the di-saster countermeasures oce (General Aairs Division) at around 13:30. We decided to set a password on this network and not to release the network to residents for personal information protection, etc. In addition, we placed the mesh network AP having the same conguration near the entrance of the town oce at around 14:30. We decided that this AP was for residents and not to set a password so that everyone could use it. Figures 15 and 16 respectively show the block diagram for the emergency network using WINDS, and the mesh network AP placed in the disaster countermeasures oce (General Aairs Division).For future research and development, we measured how much the networks were used for the AP for government and the AP for residents. For AP for government, the maximum throughput scored 18 Mbps two or three hours aer placement. It is believed that aer placing the emer-gency network, the sta implemented information collec-tion that could not have been done otherwise, and aer nishing the collection it was not necessary to use the internet for a while. Figure 17 shows the AP throughput for government and Fig. 18 shows the situation of the di-saster countermeasures oce.For AP for residents, the maximum throughput scored 18 Mbps at around 8:00 in the evening. We think that this is because the evacuees who came back to their houses in daytime returned to the evacuation center to use SNS and collect information on the internet while charging their smartphones, etc.In addition, one characteristic of how to use the net-work for residents is that the throughput tends to rise in time slots for meals of breakfast, lunch and supper. Figure 19 shows the throughput of AP for residents, and Fig. 20 shows the usage situation of the network for resi-dents.6SummaryWe introduced the research and development, advanced by NICT, and the main content of the empirical testing FiF17 Throughput of AP for governmentFiF18 Situation of the disaster countermeasures officeFiF16Emergency network AP which was set up in the disaster countermeasures office of Takamori Town3 Ultra-High-Speed Satellite Communication Technology98 Journal of the National Institute of Information and Communications Technology Vol. 64 No. 2 (2017)
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