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1.前言以海上遇难、安全通信为中心而发展的移动通信,随着高频电路技术、调制技术、小型电路技术等的发展逐渐地扩大了业务范围,诸如汽车、船舶、列车、及人等,从而对社会活动做出很大贡献。今后,随着社会活动的高度化、多样化,对移动通信的期望必将愈来愈高,因为这种手段十分方便、且能实现高度通信。本文旨在概述日本以公用、业务用通信为主的各种移动通信业务之现状及其将
1. Introduction Mobile communication, which has been developed around maritime distress and safety communications, has gradually expanded its business scope with the development of high-frequency circuit technology, modulation technology and small circuit technology, such as automobiles, ships, trains and people , Thus making a great contribution to social activities. In the future, as social activities become more diversified and diversified, the expectation for mobile communications will surely become higher and higher because of its convenience and high degree of communication. The purpose of this article is to outline the status quo of various mobile communications services in Japan that focus on public and business communications,