Spectrum recovery apparatus and method therefor
First Claim
1. A method of recovering a portion of a communication spectrum geographically allocated in a cellular pattern comprising a plurality of cells, a site being located in an active cell and being located outside of a plurality of inactive cells, said site and said cells moving relative to each other in a predetermined manner, said method comprising the steps of:
- receiving, at said site, a signal;
determining a first set of link parameters based on said signal, said first set of parameters being associated with said active cell;
predicting a second set of link parameters, said second set of link parameters being associated with one of said inactive cells that is unlikely to be interfered with by a transmission using spectrum defined by said second set of link parameters;
repetitively determining a current location of said site with respect to said cells;
changing said second set of link parameters in response to changes in said current location; and
transmitting a communication in the active cell using a communication spectrum defined by said second set of link parameters which uses a frequency associated with one of said inactive cells.
3 Assignments
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Accused Products
Abstract
A controller operates with a cellular communication system that transmits primary communications. The controller recovers a portion of the spectrum assigned to the primary communications for reuse in transmitting secondary communications. The primary communications'"'"' cells move in a predictable manner relative to a site at which the controller is located. The controller monitors primary communications to determine the current active cell. The identities of past active cells are saved so that a historical sequence of active cells is available. A map defining the relative orientation of cells is used with the historical sequence information to predict tracks through newly entered active cells. Based on this prediction, a recoverable cell is selected. Communication link parameters of the recoverable cell are used for secondary communications. The identity of the recoverable cell changes in response to changes in the identity of the active cell.
22 Citations
19 Claims
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1. A method of recovering a portion of a communication spectrum geographically allocated in a cellular pattern comprising a plurality of cells, a site being located in an active cell and being located outside of a plurality of inactive cells, said site and said cells moving relative to each other in a predetermined manner, said method comprising the steps of:
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receiving, at said site, a signal; determining a first set of link parameters based on said signal, said first set of parameters being associated with said active cell; predicting a second set of link parameters, said second set of link parameters being associated with one of said inactive cells that is unlikely to be interfered with by a transmission using spectrum defined by said second set of link parameters; repetitively determining a current location of said site with respect to said cells; changing said second set of link parameters in response to changes in said current location; and transmitting a communication in the active cell using a communication spectrum defined by said second set of link parameters which uses a frequency associated with one of said inactive cells. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. An apparatus for controlling secondary communications so that primary communications conducted within a cellular communication system are not interfered with, said primary communications being conducted in accordance with a set of active link parameters which characterize an active cell of said cellular communication system and a plurality of sets of inactive link parameters which characterize inactive cells, said apparatus comprising:
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an antenna; a receiver coupled to said antenna for receiving said primary communications; a timer to monitor durations for which said cells remain active; control means, coupled to said receiver and said timer, for determining said set of active link parameters based on said primary communications and predicting one of said sets of inactive link parameters in response to said durations; and a transmitter coupled to said control means, for transmitting secondary communications in the active cell in accordance with said one set of inactive link parameters which uses a frequency associated with one of said inactive cells. - View Dependent Claims (13, 14)
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15. A method of operating a rebroadcasting station utilized in a cellular paging system in which page communications originate from at least one satellite in a moving orbit and are rebroadcast to increase paging signal levels in areas proximate said station, said method comprising the steps of:
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(a) receiving, at a site, said page communications transmitted from said satellite; (b) identifying a currently active cell of said cellular system based on where said site is located; (c) predicting an area within said currently active cell which will travel over said site; (d) identifying an adjacent cell to said currently active cell for which a closest portion thereof is at least a distance approximately equivalent to a cell radius away from said site; (e) obtaining link parameters which characterize paging system transmissions from said satellite in said adjacent cell; and (f) transmitting said page communications in accordance with said link parameters. - View Dependent Claims (16, 17, 18, 19)
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Specification