一、前言日本目前的电话业务量已超过3000万用户,正进行着各种努力以消除阻塞现象。另外,对干移动目标,虽然也实施了船舶电话、袖珍铃呼叫、列车电话等项目,但还是不够。例如,尤其是对于现代社会中最活跃的移动体——汽车,仍处于不能使用电话的状况。在某些先进国家中,已实施了汽车电话业务,效 I. Preface Japan’s current telephone traffic has exceeded 30 million subscribers and various efforts are being made to eliminate congestion. In addition, the dry mobile targets, although the implementation of the ship phone, pocket bell calls, train calls and other projects, but not enough. For example, the mobile phone, the most active mobile in modern society, is still in a condition of being unable to use the phone. In some advanced countries, the car phone service has been implemented