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Dual mode system and dual mode wireless terminal

A terminal and mode technology, applied in wireless communication, access restrictions, electrical components, etc., can solve the problems of power consumption, terminal battery consumption too fast, continuous talk and standby time shortening, etc., to reduce power consumption, extend The effect of battery life

Inactive Publication Date: 2009-04-01
FUJITSU LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

That is, there is such a problem in the conventional method: Since the communication unit in the communication mode other than the communication mode in use must be started periodically, corresponding power consumption is required, and the battery of the terminal is consumed too quickly, resulting in short continuous talk and standby time.
However, Patent Document 1 does not relate to soft handoff in which communication is continued by switching from a base station in communication to a base station of a different wireless system without dropping the line.
In addition, Patent Document 1 does not involve searching for surrounding cells while moving in a dual-mode system in which base stations of different wireless systems perform handover.

Method used

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  • Dual mode system and dual mode wireless terminal
  • Dual mode system and dual mode wireless terminal
  • Dual mode system and dual mode wireless terminal

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Embodiment Construction

[0040] (A) Outline of the present invention

[0041] The object of the present invention is: under the dual-mode environment of W-CDMA and GSM / PDC, in the dual-mode system utilizing the terminal that can use W-CDMA and GSM / PDC two kinds of systems, each base station transmits and can identify each other's system No matter which system the terminal uses, it is possible to collect information on neighboring cells without activating the other system. Thus, according to the present invention, the terminal can recognize each other's cell information (base station presence / absence information) without activating the two systems. Therefore, it is possible to realize handover to a necessary system when necessary without causing excessive power consumption by activating another system for collecting cell information.

[0042] figure 1 It is an explanatory diagram for explaining the principle that the W-CDMA device 11 of the dual-mode wireless terminal MS recognizes the presence or a...

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Abstract

A dual-mode communication system. Base stations of a first mobile communication mode communicate with terminals in a first mobile communication mode and transmit wireless signals in a second mobile communication mode; while base stations of a second mobile communication mode communicate with terminals in a second mobile communication mode and transmit wireless signals in a first mobile communication mode. A first apparatus of the dual-mode mobile terminal communicates with base station of the first mobile communication mode in the first mobile communication mode, receives wireless signals of the first mobile communication mode transmitted from the base stations of the second mobile communication mode, and judges whether the base stations of the second mobile communication mode exist according to the wireless signals. Similarly, the second apparatus of the dual-mode mobile terminal judges whether base stations of the first mobile communication mode.

Description

[0001] This application is a divisional application of an invention patent application with an application date of April 7, 2003, an application number of 03824838.7, and an invention title of "dual-mode system and dual-mode wireless terminal". technical field [0002] The present invention relates to a dual-mode system and a dual-mode wireless terminal in the field of mobile communication, in particular to a dual-mode wireless terminal capable of communicating using two mobile communication modes in a dual-mode environment of a first mobile communication mode and a second mobile communication mode and a dual-mode system utilizing the terminal for communication. Background technique [0003] The present invention is used in an environment where existing wireless systems GSM (Global System for Mobile Communications) or PDC (Personal Digital Cellular Communications) and W-CDMA wireless systems coexist in countries such as Europe and Japan. [0004] In a dual-mode environment, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04W88/06H04W88/10H04W88/08
CPCH04W88/08H04W88/10H04W88/06H04W48/10H04W48/18
Inventor 佐佐木博生田目贤市
Owner FUJITSU LTD