COMMUNICATION APPARATUS, COMMUNICATION SYSTEM, SYNCHRONIZATION METHOD, AND COMMUNICATION APPARATUS CONTROL PROGRAM
First Claim
1. A communication apparatus which is a clock master, comprising:
- first apparatus time clocking means for clocking a first apparatus time of the communication apparatus;
first time detection means for executing a time detection process to detect, substantially at the same time, the first apparatus time and a first reference time synchronized with a second reference time referred to by a non-clock master; and
sending means for sending, to the non-clock master, the detected first apparatus time and first reference time.
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Accused Products
Abstract
A communication system includes: a communication apparatus which is a clock master including an upper clock indicating a first apparatus time; a time detection section which detects the first apparatus time and a first reference time at substantially the same time; and a sending section by which the detected first apparatus time and first reference time to a non-clock master; a communication apparatus which is a non-clock master including an upper clock indicating a second apparatus time; a time detection section which at substantially the same time detects a second reference time synchronized with the first reference time and the detected second apparatus time; a receiving section receiving the first apparatus time and the first reference time; and an adjustment section by which the upper clock is adjusted with reference to the second apparatus time, the second reference time, the first apparatus time, and the first reference time. With this, communication apparatuses communicating with one another in a communication system can synchronize their apparatus times without performing simultaneous time detection in the respective communication apparatuses.
8 Citations
25 Claims
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1. A communication apparatus which is a clock master, comprising:
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first apparatus time clocking means for clocking a first apparatus time of the communication apparatus; first time detection means for executing a time detection process to detect, substantially at the same time, the first apparatus time and a first reference time synchronized with a second reference time referred to by a non-clock master; and sending means for sending, to the non-clock master, the detected first apparatus time and first reference time. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A communication apparatus which is a non-clock master and synchronizes a first apparatus time of a clock master with a second apparatus time of the communication apparatus,
the communication apparatus comprising: -
second apparatus time clocking means for clocking the second apparatus time; second time detection means for performing a time detection process to detect, substantially at the same time, the second apparatus time and a second reference time synchronized with a first reference time referred to by the clock master; receiving means for receiving the first apparatus time and the first reference time from the clock master; and time adjustment means for adjusting the second apparatus time, with reference to the detected second apparatus time, the detected second reference time, the received first apparatus time, and the received first reference time. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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21. A communication system, comprising:
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a communication apparatus which is a clock master; and a communication apparatus which is a non-clock master, the communication apparatus as the clock master including; first apparatus time clocking means for clocking a first apparatus time of the clock master; first time detection means for executing a time detection process to detect, substantially at the same time, the first apparatus time and a first reference time synchronized with a second reference time referred to by the non-clock master; and sending means for sending, to the non-clock master, the detected first apparatus time and first reference time, the communication apparatus as the non-clock master, which synchronizes the first apparatus time of the clock master with the second apparatus time of the non-clock master, including; second apparatus time clocking means for clocking the second apparatus time; second time detection means for performing a time detection process to detect, substantially at the same time, the second apparatus time and the second reference time synchronized with the first reference time referred to by the clock master; receiving means for receiving the first apparatus time and the first reference time from the clock master; and time adjustment means for adjusting the second apparatus time, with reference to the detected second apparatus time, the detected second reference time, the received first apparatus time, and the received first reference time. - View Dependent Claims (22)
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23. A synchronization method for a communication apparatus, for synchronizing a first apparatus time which is a time of a clock master with a second apparatus time which is a time of a non-clock master,
the method comprising the steps, executed by a communication apparatus as the clock master, of: -
clocking the first apparatus time; detecting, substantially at the same time, the first apparatus time and a first reference time which is synchronized with a second reference time referred to by the non-clock master; and sending the detected first apparatus time and first reference time to the non-clock master, the method further comprising the steps, executed by a communication apparatus as the non-clock master, of; clocking the second apparatus time; detecting, substantially at the same time, the second apparatus time and the second reference time; receiving the first apparatus time and the first reference time; and adjusting the second apparatus time with reference to the detected second apparatus time, the detected second reference time, the received first apparatus time, and the first reference time.
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24. A communication apparatus control program for causing a computer to function as means of a communication apparatus which is a clock master,
the communication apparatus including: -
first apparatus time clocking means for clocking a first apparatus time which is a time of the communication apparatus; first time detection means for executing a time detection process to detect, substantially at the same time, the first apparatus time and a first reference time synchronized with a second reference time referred to by a non-clock master; and sending means for sending, to the non-clock master, the detected first apparatus time and first reference time.
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25. A communication apparatus control program for causing a computer to function as means of a communication apparatus which is a non-clock master and synchronizes a first apparatus time of a clock master with a second apparatus time which is a time of the communication apparatus,
the communication apparatus including: -
second apparatus time clocking means for clocking the second apparatus time; second time detection means for performing a time detection process to detect, substantially at the same time, the second apparatus time and a second reference time synchronized with the first reference time referred to by the clock master; receiving means for receiving the first apparatus time and the first reference time from the clock master; and time adjustment means for adjusting the second apparatus time, with reference to the detected second apparatus time, the detected second reference time, the received first apparatus time, and the received first reference time.
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Specification