Automatic time setting method of asynchronous mobile communication terminal
First Claim
1. An asynchronous mobile communication terminal, comprising:
- a real time clock circuit for generating time information;
a memory for storing a time difference table including time difference information between areas; and
a central processing unit for reading a time difference from the time difference table when a user of the terminal moves from a first area to a second area and controlling the real time clock circuit;
wherein the time difference table comprises a first columnar portion for storing area information for various first areas, a second columnar portion for storing area information for various second areas, and a third columnar portion for storing time differences between respective pairs of first and second areas, wherein the area information for the various first and second areas are received from various base stations corresponding to the first or second areas;
wherein the central processing unit reads a time difference for a pair of first and second areas by referring to the area information for the pair as stored in the first and second columnar portions.
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Abstract
In an automatic time setting method of an asynchronous mobile communication terminal, when a user moves from a first area to a second area in a GSM/GPRS network, a time difference between the two areas is calculated by using LAIs or RAIs of the first and second areas, and a time of the terminal is reset according to the calculated time difference. The asynchronous mobile communication terminal includes a RTC (real time clock) circuit for generating time information; a memory for storing time difference information between areas; and a CPU for reading a time difference corresponding to area information of a first and a second areas from the memory when a user moves from the first area to the second area and controlling the RTC circuit.
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Citations
15 Claims
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1. An asynchronous mobile communication terminal, comprising:
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a real time clock circuit for generating time information; a memory for storing a time difference table including time difference information between areas; and a central processing unit for reading a time difference from the time difference table when a user of the terminal moves from a first area to a second area and controlling the real time clock circuit; wherein the time difference table comprises a first columnar portion for storing area information for various first areas, a second columnar portion for storing area information for various second areas, and a third columnar portion for storing time differences between respective pairs of first and second areas, wherein the area information for the various first and second areas are received from various base stations corresponding to the first or second areas; wherein the central processing unit reads a time difference for a pair of first and second areas by referring to the area information for the pair as stored in the first and second columnar portions. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A time setting method of an asynchronous mobile communication terminal, comprising:
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requesting area information of a second area to a base station when a user of the terminal moves from a first area to the second area in an asynchronous network; storing the area information of the second area provided from the base station in a time difference table; reading a time difference between the first and second areas from the time difference table; and resetting a time of the terminal by using the read time difference; wherein the time difference table comprises a first columnar portion for storing area information for various first areas, a second columnar portion for storing area information for various second areas, and a third columnar portion for storing time differences between respective pairs of first and second areas; wherein the method further comprises reading a time difference for a pair of first and second areas by referring to the area information for the pair as stored in the first and second columnar portions. - View Dependent Claims (9, 10, 11, 12, 13, 14, 15)
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Specification