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Two-way paging apparatus having highly accurate frequency hopping synchronization
| Details |
Inventors: Yokev, Hanoch; Meiman, Yehouda; Peleg, Shimon; Yokev, Oren; Porat, Boaz;
Assignee: NEXUS 1994 Limited (London, GB2)
Primary Examiner: Chin; Wellington
Assistant Examiner: Luther; William
Attorney, Agent or Firm: Schwegman, Lundberg, Woessner & Kluth, P.A.
A method, apparatus and system is described for distributing accurate time-of-day information from an existing telecommunications infrastructure without modifying the existing infrastructure. In particular, the system comprises a base station device which continually receives extremely accurate time-of-day information from, by way of example and not by limitation, a GPS (Global Positioning Satellite) system, a local atomic dock, or a wired or wireless time standard. The base station periodically places time-of-day information into standard paging packets for transmission over a standard paging network. The paging packets are sent over telephone lines to the paging terminal for transmission whenever a time slot for transmission becomes available. The base station device records the actual time of transmission of the paging packet containing the time of day information and prepares the next time-of-day packet by placing the exact transmission time of the previous time-of-day packet sent. In the receiver, an algorithm is used to extrapolate the current time-of-day based on the history of transmitted packets containing measured time-of-day information of past transmissions. |
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DETAILED DESCRIPTION The above mentioned needs in the art are addressed by the present invention.
The present invention is a method, apparatus and system for distributing accurate time-of-day or synchronization information from an existing telecommunications infrastructure without modifying the existing infrastructure.
In particular, the system includes a base station device which continually receives extremely accurate time of day information from, by way of example and not by limitation, a GPS (Global Positioning Satellite) receiver, a local atomic dock, or a wired or wireless time standard.
The accurate time of day system periodically places time-of-day information into standard paging packets for transmission over a standard paging network.
The paging packets are sent over telephone lines to the paging terminal and are transmitted whenever a lime slot for transmission becomes available.
The base station device is equipped with a paging receiver which records the exact time of transmission of the paging packet containing the time of day information and prepares the next time-of-day packet by placing the exact transmission time of the last packet sent.
In a paging receiver, an algorithm is used to extrapolate the current time-of-day based on the history of transmissions giving the exact time-of-day information of past transmissions.
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