1. [1] H. Tomioka, “Maintaining communications capabilities during major natural disasters and other emergency situations,” March 2012,[Online]. Available: https://www.soumu.go.jp/main_sosiki/joho_tsusin/eng/presentation/pdf/Telecommunications_Policy_Division_MIC.pdf
2. [2] M. Kobayashi, “Experience of infrastructure damage caused by the Great East Japan Earthquake and countermeasures against future disasters,” IEEE Commun. Mag., vol. 52, no. 3, pp. 23-29, March 2014.
3. [3] Y. Ran, “Considerations and suggestions on improvement of communication network disaster countermeasures after the Wenchuan earthquake,” IEEE Commun. Mag., vol. 49, no. 1, pp. 44-47, January 2011.
4. [4] K. Okada, H.N. Nguyen, and K. Gyoda, “2 technologies for emergency communication networks: 2-1 for high availability of mobile phone-researches on network control technologies in disasters,” J. of the Nat. Inst. of Inf. and Commun. Technol., vol. 58, no. 1-2, pp. 88-93, March 2011.
5. [5] K. Tanabe, S. Miyata, K. Baba, and K. Yamaoka, “Threshold relaxation and holding time limitation method for accepting more general calls under emergency trunk reservation,” IEICE Trans. Fundamentals of Electronics, Commun. and Comput. Sci., vol. E99-A, no. 8, pp. 1518-1528, August 2016.