Patent ID: 6999768
Filing Date: 2006-02-14
Classification: H04W

Abstract:
1. A mobile telephone communication system comprising: a plurality of mobile telephone devices movable through a plurality of service areas; a plurality of radio base station groups, each being constituted by a plurality of subordinate radio base stations disposed in every said plurality of service areas and providing said plurality of mobile telephone devices with a speech service, and a main radio base station connected to said plurality of subordinate radio base stations by means of set lines and conducting a hand off control for allowing said mobile telephone devices to move between said subordinate radio base stations, which are accommodated in a control territory thereof, in compliance with movements of said mobile telephone devices; and a mobile telephone exchange connected to said main radio base stations by means of set lines, and conducting a hand off control for allowing said mobile telephone devices to move between said main radio base stations, which are accommodated in a control territory thereof, in compliance with movements of said mobile telephone devices, wherein said mobile telephone device comprises: an electrical field level measuring means for conducting, upon receipt of an electrical field level measuring request signal from said main radio base station, which controls the radio base station group from which said mobile telephone device receives a speech service via a subordinate radio base station, measurement of electrical field levels of the field measuring channels of neighboring plural said subordinate radio base stations as well as measurement of an electrical field level of the downlink speech channel allocated for speech; an electrical field level measuring result reporting means for periodically reporting the electrical field level measured values measured by said electrical field level measuring means to said main radio base station via the subordinate radio base station as an electrical field level measuring result signal; and an electrical field level measuring stopping means for receiving a soft hand off indicating signal from a soft hand off controlling means of said mobile telephone exchange, thereby stopping measurement of both the electrical field levels of the field measuring channels of said neighboring subordinate radio base stations indicated by said main radio base station that is the source of the hand off and the electrical field level of the downlink speech channel, and further stopping transmission of an electrical field level measuring result signal.