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    31.
    发明专利
    未知

    公开(公告)号：DE69228376D1

    公开(公告)日：1999-03-18

    申请号：DE69228376

    申请日：1992-10-19

    Applicant: MOTOROLA INC

    Inventor： LO GALBO ROBERT ,  HIBEN BRADLEY ,  CUDAK MARK

    IPC: H04B17/00 ,  H04H20/67 ,  H04J3/06 ,  H04B7/00 ,  H04H3/00

    Abstract: A method for measuring channel delay measures the delay for a message to propagate from a prime site (100, 400) to a remote site (200, 500) via the channel (300, 600). The prime site includes a clock for providing a first value, T1, based on the current time at the prime site. The remote site includes a clock for providing a second value, T2, based on the current time at the remote site. Both clocks are synchronized with a common timing source, such as a GPS satellite timing signal. Therefore, T2 equals T1. In one embodiment, the prime site determines T1, and simultaneously sends a message to the remote site via the channel, the message including T1. Upon receiving the message, the remote site simultaneously determines T2. The remote site decodes the message to determine T1, and then determines the delay based on the difference between T2 and T1.

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