Telecommunications – Transmitter and receiver at same station – Radiotelephone equipment detail
Reexamination Certificate
1998-09-29
2001-08-28
Maung, Nay (Department: 2744)
Telecommunications
Transmitter and receiver at same station
Radiotelephone equipment detail
C455S566000, C455S432300, C368S021000, C368S047000
Reexamination Certificate
active
06282431
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a time correcting method of automatically correcting a time of a timer and a portable remote telephone terminal having a timer in which a time is corrected in accordance with the time correcting method.
2. Description of the Related Art
In general, a portable remote telephone terminal has a timer indicating the present time. In a case where a user having such a portable remote terminal moves in areas between which there is a difference in time, it is preferable that the time of the timer is easily corrected.
The portable remote telephone terminal has a constitution corresponding to types of service systems. There are an analog system and a digital system as the types of service systems. As the analog system, an AMPS (Advanced Mobile Phone Service) system, a TACS (Total Access Communications System) and an NTT system have been known. As the digital system, a PDC (Personal Digital Cellular) of a TDMA system, a GSM (Global System for Mobile Communications), and an IS-95 (cdmaOne) of a CDMA (Code Division Multiple Access) system have been known.
The portable remote telephone terminal has a timer and the present time is indicated in a display unit. When a user uses the portable remote telephone terminal for the first time, the user initially sets the present time of the timer. The portable remote telephone terminal in which a calling time period can be indicated by using a function of the timer has been known. A base station for the portable remote telephone services supplies various types of information to portable remote telephone terminals in a service area.
The portable remote telephone service system is formed so as to be capable of supplying services in a wide area. As a result, an area in which a user of the remote portable telephone terminal can move is expanded. A user having the remote portable telephone terminal may move from one area to another area between which areas there is the difference in time. For example, there is one hour difference between Chicago and New York. Thus, in a case where a user sets the time of the portable remote telephone terminal in New York and then moves to Chicago, the time obtained in the portable remote telephone terminal differs from the actual local time in Chicago.
Due to an automatic answering/recording function of the personal remote telephone terminal, a receiving time at which a message is received is recorded with the message. If the time obtained in the portable remote telephone terminal is not correct based on the difference in time, the receiving time recorded in the portable remote telephone terminal is not correct. In addition, in a case where times at which data is transmitted and received are recorded, the recorded times may not be corrected. Thus, every time the user having the portable remote telephone terminal moves in areas between which there is the difference in time, the user has to do an operation for resetting the timer of the portable remote telephone terminal to the local time. The operation is troublesome for a user who frequently moves in areas between which there is the difference in time.
SUMMARY OF THE INVENTION
Accordingly, a general object of the present invention is to provide a novel and useful time correcting method and a portable remote telephone terminal using the time correcting method in which the disadvantages of the aforementioned prior art are eliminated.
A specific object of the present invention is to provide a time correcting method by which a time is automatically corrected to a local time when a user of a remote portable telephone terminal moves in areas between which there is a difference in time.
The above objects of the present invention are achieved by a time correcting method comprising steps of: (a) receiving notifying information from a base station, the notifying information including an identification number identifying the base station; (b) selecting a time differential information item corresponding to the identification number from a table which indicates a relationship between identification numbers identifying base stations and time differential information items in service areas of the respective base stations; and (c) correcting a present time using the time differential information item selected in step (b).
Another object of the present invention is to provide a portable remote telephone terminal in which the time is corrected in accordance with the above time correcting method.
The object of the present invention is achieved by a portable remote telephone terminal which receives notifying information from a base station and has a timer, the notifying information including an identification number identifying the base station, comprising: a table indicating a relationship between identification numbers identifying base stations and time differential information items in service areas of the respective base stations; selecting means for selecting a time differential information item corresponding to the identification number included in the received notifying information from the table; and correcting means for correcting a present time of the timer using the time differential information item selected by the selecting means.
According to the present invention, the table indicating the relationship between identification numbers identifying base stations and time differential information items in service areas of the respective base stations is used. When an identification number included in the notifying information is transmitted from a base station, the present time is corrected using a time differential information item indicated in the table as a time differential information item corresponding to the received identification number. Thus, the present time can be automatically corrected to a local time even if a user of a remote portable telephone terminal moves in areas between which there is the difference in time.
In addition, the above objects are also achieved by a portable remote telephone terminal which receives notifying information from a base station, has a timer and functions in a dual mode, the dual mode being a mode in which a first system supplying time information and a second system not supplying the time information are selectable, the portable remote telephone terminal comprising: a table indicating a relationship between identification numbers identifying base stations and time differential information items in service areas of the respective base stations, each of the time differential information items being a difference between a standard time and a local time in a corresponding one of the service areas of the respective base stations; a register storing time difference information indicating a difference between a present time set in the timer and the standard time; a receiving unit receiving the time information supplied in the first system to which the second system selected immediately after turning on a power supply is switched; a time setting unit setting a present time based on the time information received by the receiving unit; a mode switch-back unit switching the first system back to the second system; a selecting unit selecting from the table a time differential information item corresponding to the identification number included in the notifying information received in the second system; and a correcting unit for correcting a present time of the timer using a difference between the time difference information item selected by the selecting unit and the time differential information stored in the register.
According to the above portable remote telephone terminal, in the dual mode in which the first system supplying the time information, such as the CDMA system, and the second system not supplying the time information, such as the AMPC system are selectable, the present time can be corrected to a local time.
REFERENCES:
patent: 4204167 (1980-05-01), Liu
patent: 5319374 (1994-06-01), Desai et al.
patent: 5363377 (1994-11-01), Sharpe
patent: 5375104 (1
Fujitsu Limited
Helfgott & Karas P.C.
Maung Nay
Persino Ray
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