Radio communication system having autonomously selected transmission frequencies
First Claim
1. A control module for use in a first radio communication system for communicating with each of a plurality of stations and for detecting a presence and absence of radio frequency signals, said control module comprisingfirst receiver means for receiving a predetermined first radio frequency signal from a source other than said plurality of stations,second means for receiving a start-up signal, andfirst transmitter means jointly responsive to said start-up signal and the absence of reception of said first radio frequency signal in a predefined time interval for transmitting said first radio frequency signal.
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Accused Products
Abstract
When the disclosed frequency-hopping communication system is initially enabled, it detects another system operating within range by listening for a predefined radio frequency of a fixed duration. When that particular frequency is detected, the system knows that a master system is operating within range and is utilizing a first predetermined group of communication frequencies and, consequently, selects a second, third, etc. predetermined group of communication frequencies. If the particular radio frequency is not detected, the system becomes the master system, selects the first predetermined group of communication frequencies for intra-system communication and begins transmitting the predefined radio frequency to indicate its master status.
60 Citations
12 Claims
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1. A control module for use in a first radio communication system for communicating with each of a plurality of stations and for detecting a presence and absence of radio frequency signals, said control module comprising
first receiver means for receiving a predetermined first radio frequency signal from a source other than said plurality of stations, second means for receiving a start-up signal, and first transmitter means jointly responsive to said start-up signal and the absence of reception of said first radio frequency signal in a predefined time interval for transmitting said first radio frequency signal.
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11. A radio communication system comprising a control module for transmitting to each of a plurality of stations and for detecting the presence and absence of radio frequency signals, said system further comprising
at said control module first receiver means for receiving a predetermined first radio frequency signal from a source other than said plurality of stations, second means for receiving a start-up signal, and means jointly responsive to said start-up signal and the absence of reception of said first radio frequency signal in a predefined time interval for transmitting said first radio frequency signal and for communicating with said plurality of stations using a first group of frequencies.
Specification