Patent ID: 6931250

Claim:
A communicative base station switching system of a portable terminal for switching a communicative base station to neighbor base stations while in motion comprising: a received electric field measuring section for measuring the received electric fields from the communicative base station and the neighbor base stations; a received electric field memory section for storing received electric field patterns of the communicative base station and two given neighbor stations measured in the received electric field measuring section whenever the communicative base station for communication for a first time is switched over to one of the neighbor base stations; a received electric field pattern comparing section for comparing the received electric field pattern of the communicative base station and the two given neighbor stations and the received electric field patterns stored in the received electric field memory section whenever the received electric fields from the communicative base station having been in communication with the portable terminal before and the two given neighbor base stations are measured in the received electric field measuring section; and a base station position acquiring and switching means for acquiring the position of a neighbor station, which the portable terminal is moving toward, in correspondence to a stored received electric field, which is found in the received electric field pattern comparing section to be identical in pattern with a measured received electric field, and switching the communicative base station over to the pertinent neighbor base station.