Radio communication system using synchronous frequency hopping transmissions
First Claim
1. A radio communication system including a control unit which transmits information to and receives information from each of a plurality of stations using frequencies selected from a group of frequencies using a frequency-hopping sequence, said system comprisingat said control unitmeans for transmitting to each of said plurality of stations a first control message identifying both a first unique starting frequency from a first frequency group at which to start receiving from said control unit and a second unique starting frequency from said first frequency group at which to start transmitting to said control unit and further identifying at each of said plurality of stations the same frequency-hopping sequence to ensure that no two stations of said plurality of stations use the same frequency at the same time for transmissions to and receptions from said control unit,at each of said plurality of stationsmeans responsive to said control message for identifying the second and first unique starting frequencies, respectively, for transmitting and receiving at each of said plurality of stations, and for establishing said frequency-hopping sequence to select transmission and reception frequencies thereat.
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Accused Products
Abstract
A frequency-hopping radio communication system is disclosed comprising a control unit which transmits to and receives from each of a plurality of slave stations using a frequency-hopping mode of operation. During a start-up mode, the control unit communicates a starting message to each slave station using a predefined frequency. The message identifies to each slave station a frequency-hopping sequence to be used to select the frequencies from a group of frequencies for transmission to and reception from the control unit. This message also specifies to each slave station unique starting frequencies in the frequency-hopping sequence at which to begin transmitting and receiving. All slave station transmissions are synchronized to the control unit transmissions, thereby preventing any two stations from concurrently using the same frequencies for either transmitting to or receiving from the control unit.
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Citations
17 Claims
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1. A radio communication system including a control unit which transmits information to and receives information from each of a plurality of stations using frequencies selected from a group of frequencies using a frequency-hopping sequence, said system comprising
at said control unit means for transmitting to each of said plurality of stations a first control message identifying both a first unique starting frequency from a first frequency group at which to start receiving from said control unit and a second unique starting frequency from said first frequency group at which to start transmitting to said control unit and further identifying at each of said plurality of stations the same frequency-hopping sequence to ensure that no two stations of said plurality of stations use the same frequency at the same time for transmissions to and receptions from said control unit, at each of said plurality of stations means responsive to said control message for identifying the second and first unique starting frequencies, respectively, for transmitting and receiving at each of said plurality of stations, and for establishing said frequency-hopping sequence to select transmission and reception frequencies thereat.
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10. A control unit for use in a radio communication system including means for transmitting information to and receiving information from each of a plurality of stations using frequencies selected from a first group of frequencies using a frequency-hopping sequence, said control unit further comprising
means for transmitting to each of said plurality of stations a control message identifying both a first unique starting frequency from said first frequency group at which to start receiving from said control unit and a second unique starting frequency from said first frequency group at which to start transmitting to said control unit and further identifying at each of said plurality of stations the same frequency-hopping sequence to ensure that no two stations of said plurality of stations use the same frequency at the same time for transmissions to and receptions from said control unit.
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14. A station for use in a radio communication system including means for receiving information from and transmitting information to a control unit using frequencies selected from a group of frequencies using a frequency-hopping sequence, said station further comprising
means responsive to a first control message received from said control unit for identifying a first and a second unique starting frequency, respectively, for transmitting and receiving, and for establishing said frequency-hopping sequence to select transmission and reception frequencies for said station from a group of frequencies.
Specification