大規模災害時には被災地外の人も含め誰もが即時に家族や知人と電話での連絡をとりたいものである.このためには，被災地での施設の冗長化や，被災地以外の人も含めて大勢が同時に通話できるだけの通信帯域が必要である.通信帯域が十分にある以上，通信帯域の確保のための呼設定は無用であり，負荷を考えると有害ですらある.移動体通信のための無線区間の制御も，十分に簡略化されるべきである.%At catastrophe, people, including those not directly suffer from the catastrophe, want to communicate with their family members or acquaintances immediately. To do so, it is necessary to provide redundant equipments at places of the catastrophe and enough communication bandwidth. With the enough communication bandwidth, signaling to guarantee communication bandwidth is not necessary or, considering signaling load, rather harmful. Control over wireless sections for mobile communication should also be enough simplified.
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