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Radio communication system, control method thereof, and radio communication terminal
| Details |
Inventors: Sawada, Toshinori;
Assignee: Casio Computer Co., Ltd. (Tokyo, JP)
Primary Examiner: Vo; Nguyen T.
Assistant Examiner: Nguyen; Duc
Attorney, Agent or Firm: Frishauf, Holtz, Goodman, Langer & Chick, P.C.
A CPU built in a portable telephone (or a PHS terminal), receiving the control signal from a doorway base station, detects the present operation mode. If the present mode is the call enable mode, it is assumed that the user has entered a use inhibit area and the operation mode is changed to any one of the sleep #1 mode and sleep #2 mode previously specified, these two modes belonging to the call inhibit mode. The CPU then performs call incoming control or call originating control. In a case where the present mode is the call inhibit mode when the CPU receives the mode change signal, it is assumed that the user has left the use inhibit area and the operation mode is returned to the standby mode, the call enable mode, and call incoming control and call originating control in the present operation mode are performed. |
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DETAILED DESCRIPTION OF THE INVENTION Hereinafter, embodiments of a radio communication system according to the present invention will be described in detail by reference to FIGS.
1 to 5.
While in the embodiments that follow, the present invention is applied to PHS, it may be applied to a other portable telephones.
First Embodiment FIG.
1 shows a schematic configuration of a radio communication system according to a first embodiment of the present invention.
The figure shows that a PHS terminal user (hereinafter, referred to as a user) 2 carrying a portable telephone (hereinafter, referred to as a PHS terminal) 1 has entered a PHS terminal use inhibit area 3 from a doorway 4.
The use inhibit area is a public place, such as a theater or a hospital.
At the top of the doorway 4, a doorway base station 5 for a radio communication is provided.
A cover area 6 shows a range in which the doorway base station 5 can transmit and receive an ordinary speech signal via a radio channel.
The doorway base station 5 has not only the function of an ordinary base station but also the function of constantly transmitting a control signal to a PHS terminal 1 passing through the doorway 4 of the use inhibit area 3 within the cover area 6.
It is not always necessary for the doorway base station 5 to have the two functions.
Only a control signal transmitter may be provided on the doorway 4.
In this case, an ordinary base station need not be provided on the doorway 4.
The place where the base station with the control signal transmitting function is provided is not limited to the doorway 4.
The base station may be provided in any place, provided that the base station has directivity that enables the control signal to be transmitted to a terminal passing through the doorway 4.
The control signal may have either the same frequency band as or a different frequency band from that of the signal transmitted from an ordinary communication business radio base station or a private base-station.
In the embodiment, the control signal and the speech signal have the same frequency
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