Paging system providing continvous synchronization of simulcast delay
First Claim
1. A data transmission system, comprising:
- a plurality of transmission sites disposed in the footprint of a satellite that transmits timing information;
a satellite receiver disposed at the transmission sites for receiving the timing information from the satellite, the timing information received at the satellite receivers associated with the transmission sites at substantially the same time;
a data communication channel connected from a data source to the transmission sites;
a data receiver disposed at the transmission sites for receiving data from the data communication channel that is transmitted from the data source;
a data transmitter disposed at the transmission sites and coupled to the data receiver to receive the data and to transmit the data within a predetermined transmission locale proximate to the transmission sites for reception by a mobile data receiver;
a synchronization system disposed at each of the transmission sites for receiving the timing information from the satellite and for continuously synchronizing delay at the transmitter with the timing information; and
wherein the synchronization system continuously synchronizes the delay with the timing information so that data received by the data receiver is transmitted at substantially the same time from each of the transmitters.
1 Assignment
0 Petitions
Accused Products
Abstract
A paging system includes a satellite uplink (40) for assembling paging information and transmitting it to a satellite (26). The satellite (26) is then operable to transmit in a simulcast manner all the information to various regional paging systems (42). Each of the paging systems (42) includes a plurality of towers (10) each containing a satellite receiver (50), a satellite dish (48) associated therewith and a paging transmitter (52). Each of the satellite receivers (50) are operable to receive the information transmitted from the satellite (26) at substantially the same time such that there is no phase difference between any of the towers, regardless of location. Therefore, the transmitters (50) can transmit through antennas (12) information at the paging frequency with substantially no relative delays relative to each of the antennas (12). A backup link receiver (28) is provided for interfacing with a backup link transmitter (70). In the event of a failure of the receivers (50) or the satellite (26), the link transmitter (70) will transmit the paging information directly to select ones of the towers (10) over a separate frequency.
36 Citations
20 Claims
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1. A data transmission system, comprising:
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a plurality of transmission sites disposed in the footprint of a satellite that transmits timing information; a satellite receiver disposed at the transmission sites for receiving the timing information from the satellite, the timing information received at the satellite receivers associated with the transmission sites at substantially the same time; a data communication channel connected from a data source to the transmission sites; a data receiver disposed at the transmission sites for receiving data from the data communication channel that is transmitted from the data source; a data transmitter disposed at the transmission sites and coupled to the data receiver to receive the data and to transmit the data within a predetermined transmission locale proximate to the transmission sites for reception by a mobile data receiver; a synchronization system disposed at each of the transmission sites for receiving the timing information from the satellite and for continuously synchronizing delay at the transmitter with the timing information; and wherein the synchronization system continuously synchronizes the delay with the timing information so that data received by the data receiver is transmitted at substantially the same time from each of the transmitters. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method for transmitting data, comprising the steps of:
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disposing a plurality of transmission sites in the footprint of a satellite; receiving at the transmission sites timing information transmitted from the satellite, the timing information received at the transmission sites at essentially the same time; receiving at the transmission sites data transmitted over a communication channel from a data source; transmitting the received data on a data frequency within a predetermined transmission locale proximate to each of the transmission sites for reception by a mobile data receiver; and continuously synchronizing delay at each of the transmission sites with the timing information from the satellite, the step of synchronizing continuously synchronizes the delay with the timing information so that data to be transmitted by each of the transmission sites is transmitted at substantially the same time. - View Dependent Claims (11, 12, 13, 14, 15, 16)
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17. A paging transmission system, comprising:
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a plurality of paging sites disposed in the footprint of a satellite that transmits timing information; a satellite receiver disposed at the paging sites for receiving the timing information from the satellite, the timing information received at the satellite receivers associated with the paging sites at substantially the same time; a data communication channel connected from a data source to the paging sites; a data receiver disposed at the paging sites for receiving data from the data communication channel that is transmitted from the data source; a paging transmitter disposed at the paging sites and coupled to the data receiver to receive the data and to transmit the data within a predetermined transmission locale proximate to the paging sites for reception by a mobile pager; a synchronization system disposed at each of the paging sites for receiving the timing information and for continuously synchronizing delay at the transmitter with the timing information; and wherein the synchronization system continuously synchronizes the delay with the timing information so that data received by the paging receiver is transmitted at substantially the same time from each of the transmitters. - View Dependent Claims (18, 19, 20)
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Specification