Communications apparatus and method
First Claim
Patent Images
1. A communications system comprising:
- a satellite mobile communications network which comprises a plurality of satellites and a plurality of user terminals communicating on satellite uplink and downlink bands in which said satellite mobile communications network communicates in frequency-divided fashion, using relatively narrow frequency channels within said bands; and
a terrestrial mobile communications network which comprises a plurality of base stations and a plurality of user terminals communicating on terrestrial uplink and downlink bands in which said terrestrial mobile communications network communicates in code-divided fashion, using relatively wide frequency channels within said bands wherein at least one of the terrestrial bands at least partly reuses at least one of the satellite bands.
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Abstract
A method of reusing frequency bands between base stations of a terrestrial mobile communications network and a satellite communications network, comprising allocating the frequency bands using integrated resource management and other mitigation techniques in a such a way as to minimize interference between both the systems, thus making optimum usage of valuable frequency spectrum.
41 Citations
31 Claims
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1. A communications system comprising:
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a satellite mobile communications network which comprises a plurality of satellites and a plurality of user terminals communicating on satellite uplink and downlink bands in which said satellite mobile communications network communicates in frequency-divided fashion, using relatively narrow frequency channels within said bands; and
a terrestrial mobile communications network which comprises a plurality of base stations and a plurality of user terminals communicating on terrestrial uplink and downlink bands in which said terrestrial mobile communications network communicates in code-divided fashion, using relatively wide frequency channels within said bands wherein at least one of the terrestrial bands at least partly reuses at least one of the satellite bands. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27)
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28. A communications system comprising a satellite mobile communications network which comprises a plurality of satellites and a plurality of user terminals communicating on satellite uplink and downlink bands;
- and a terrestrial mobile communications network which comprises a plurality of base stations and a plurality of user terminals communicating on terrestrial uplink and downlink bands, the system comprising;
a controller to perform frequency planning based on a position of a selected one of the plurality of user terminals wherein the selected user terminal operates in a frequency designated by the controller, the designated frequency being in one of the terrestrial bands that at least partly reuses at least one of the satellite bands. - View Dependent Claims (29)
- and a terrestrial mobile communications network which comprises a plurality of base stations and a plurality of user terminals communicating on terrestrial uplink and downlink bands, the system comprising;
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30. A communications system comprising a satellite mobile communications network which comprises a satellite communicating on satellite uplink and downlink bands;
- and a terrestrial mobile communications network which comprises a base station communicating on terrestrial uplink and downlink bands, the system comprising;
a dual-mode user terminal capable of communicating with the satellite using the satellite uplink and downlink bands and capable of communicating with the base station using the terrestrial uplink and downlink bands, the user terminal communicating on one of the terrestrial bands that at least partly reuses at least one of the satellite bands and comprising;
a controller to detect transmissions between the base station and the satellite on an operational frequency in the satellite uplink and downlink bands, the controller causing the user terminal to cease using the operational frequency for communication with the base station upon detection of the transmission. - View Dependent Claims (31)
- and a terrestrial mobile communications network which comprises a base station communicating on terrestrial uplink and downlink bands, the system comprising;
Specification