Telecommunications – Radiotelephone system – Zoned or cellular telephone system
Reexamination Certificate
1999-03-15
2001-11-27
Le, Thanh Cong (Department: 2684)
Telecommunications
Radiotelephone system
Zoned or cellular telephone system
C455S453000, C455S515000
Reexamination Certificate
active
06324397
ABSTRACT:
TECHNICAL FIELD
The present invention relates to a portable terminal equipment such as a portable telephone or the like. In details, the present invention relates to a portable terminal equipment capable of saving power consumption by controlling the interval between each reception of the control channel in a standby state on the basis of receiving state.
BACKGROUND OF THE INVENTION
In a simplified type portable telephone-such as PHS (Personal Handyphone System), in the case of out-of-synchronism with a control channel, the synchronism with the control channel is established by receiving the control channel transmitted from a cell station and then a location thereof is registered to the cell station and the telephone shifts to a standby state. In addition, in the standby state, the telephone receives intermittently the control channel and obtains the data such as the arrival of incoming call.
The cell station, however, transmits the data such as the arrival of incoming call, plural times in consideration of jamming and soon. Therefore, when the control channel is received in a good state, it has no trouble that the interval between each reception of the control channel becomes longer.
Hence, it is an object of the present invention to provide a portable terminal equipment capable of saving the power consumption by controlling the interval between each reception of the control channel on the basis of the receiving state.
DISCLOSURE OF THE INVENTION
According to the present invention, there is provided a portable terminal equipment receiving intermittently a control channel transmitted from a cell station in a standby state which comprises a receiving-state-judging means for judging whether or not said control channel is received in a good state, and a receiving control means for controlling an interval between each reception of said control channel on the basis of the result of judgment of the receiving-state-judging means. Further, said receiving control means controls the interval so that when said receiving-state-judging means judges that said control channel is kept on receiving in a good state for a predetermined period of time while said control channel is received at every first interval, said control channel is made received at every second interval that is longer than said first interval; and said receiving control means also controls the interval so that when said receiving-state-judging means judges that said control channel is not received in a good state while said control channel is received at every said second interval, said control channel is made received at every said first interval.
Said receiving-state-judging means judges whether or not said control channel is received in a good state, based on an intensity of electric field or the presence or absence of the error in the received data and so on. Further, the interval between each reception of the control channel is controlled according to the result of judgment by the receiving-state-judging means. The equipment is controlled so that when said receiving-state-judging means judges that said control channel
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is kept on receiving in a good state for a predetermined period of time while said interval between each reception of the control channel is short, said interval is extended. The equipment is also controlled so that when said receiving-state-judging means judges that said control channel is not received in a good state while said interval between each reception of the control channel is long, said interval is shortened.
Where the interval between each reception of control channel is so controlled that said interval becomes longer, said receiving-state-judging means judges, according to this invention, that the control channel is kept on receiving in a good state for a predetermined period of time while said interval between each reception of the control channel is short. Therefore, this invention prevents the equipment from being so precipitately controlled that said interval becomes longer when the control channel is suddenly made received in a good state even though the control channel is not received in a good state on the whole.
REFERENCES:
patent: 4969205 (1990-11-01), Itoh
patent: 5603093 (1997-02-01), Yoshimi et al.
patent: 5761198 (1998-06-01), Kojima et al.
patent: 5805666 (1998-09-01), Ishizuka et al.
patent: 5884165 (1999-03-01), Uchida et al.
patent: 4-241528 (1992-08-01), None
patent: 5-327586 (1993-12-01), None
patent: 7-30478 (1995-01-01), None
Adachi Naofumi
Ootake Akira
Saitou Teru
Takeshima Yoshihito
Terada Ryouji
Aiwa Co. Ltd.
Cong Le Thanh
Nguyen Thuan T.
Smith-Hill and Bedell
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