Portable telephone set and communication base station switching system
1 Assignment
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Accused Products
Abstract
A received electric field measuring section 11 measures the received electric fields from the communicative base station and the neighbor base stations. A received electric field memory section 12 stores 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 the first time is switched over to one of the neighbor base stations. A received electric field pattern comparing section 13 compares the received electric field patterns of the communicative base station having 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 been in communication with before and the two given neighbor base stations are measured in the received electric field measuring section. A base station position acquiring and switching means 14 and 15 acquires 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.
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Citations
8 Claims
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1-5. -5. (canceled)
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6. A communicative base station switching system of a portable terminal for switching a communicative base station while in motion comprising:
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a base station memory section for storing base station position data;
a base station position comparing section for receiving position data from a global positioning system of a mobile body and obtaining and comparing the distances of a plurality of neighbor base stations from the portable terminal by using the received position data as the position data of the portable terminal; and
a base station frequency switching section for switching the communicative base station of the portable terminal to one of the neighbor base stations of the plurality of neighbor base stations based on which of the neighbor base stations is closest to the portable terminal according to the result of comparison in the base station position comparing section, wherein the base station position memory section stores latitude and longitude positions of base stations. - View Dependent Claims (8)
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7. A communicative base station switching system of a portable terminal for switching a communicative base station while in motion in which base station position data and portable terminal position data are obtained, distances of a plurality of neighbor base stations from the portable terminal are obtained on the basis of the obtained position data, and the communicative base station of the portable terminal is switched to one of the neighbor base stations based on which neighbor base station is located closest to the portable terminal,
said communication base station switching system further comprising a global positioning system section for obtaining latitude and longitude positions of base stations.
Specification