US4872205A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Radio communication system having autonomously selected transmission frequencies
Assignee: Avaya Technology LLC
•
Filing: 1987-08-21
•
Granted: 1989-10-03
•
Expires: 2007-08-21
Abstract
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.
Inventors
- 👤 James W. Smith
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 13:59
CPC Classifications
H; H04; H04B; H04B7/00; H04B7/24; H04B7/26; H04B1/00; H04B1/69; H04B1/713; H04B1/7156; H04B2001/71563
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
95 words
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.
Claim 2
Dependent Claim
95 words
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.
Claim 3
Dependent Claim
30 words
The control module of claim 1 wherein said first radio frequency signal is received from a second communication system indicating the radio frequencies used for communications within said second system.
Claim 4
Dependent Claim
33 words
The control module of claim 2 wherein said first radio frequency signal includes a start sequence signal and wherein said first-system synchronizes its operation to said second system using said start sequence signal.
Claim 5
Dependent Claim
19 words
The control module of claim 1 wherein said start-up signal is generated when said control module is initially powered.
Claim 6
Dependent Claim
26 words
The control module of claim 1 wherein said start-up signal is generated when the first receiver means indicates the absence of said first radio frequency signal.
Claim 7
Dependent Claim
22 words
The control module of claim 1 wherein said predefined interval is a random time interval following the power-up of said control module.
Claim 8
Dependent Claim
29 words
The control module of claim 1 wherein said transmitter means transmits said first radio frequency signal at a predetermined periodic rate for a time greater than said predefined interval.
Claim 9
Dependent Claim
49 words
The control module of claim 1 wherein said first receiver means receives a second radio frequency signal and said first transmitter means additionally transmits said second radio frequency signal in response to the absence of reception of both said first radio frequency signal and said second radio frequency signal.
Claim 10
Dependent Claim
63 words
The control module of claim 1 wherein said first transmitter means is also responsive to the presence of reception of a pulsed first radio frequency signal in a predefined time interval for transmitting a second radio frequency signal, said second radio frequency signal is a pulsed signal having the same frequency as said first radio frequency signal, and is interleaved in time therewith.
Claim 11
Dependent Claim
84 words
The control module of claim 1 further comprising second transmitter means for transmitting radio frequency signals, means for selecting a first group of radio frequencies for transmission from said second transmitter means to said plurality of stations in response to the absence of reception of said first radio frequency signal and for selecting a second group of radio frequencies for transmission from said second transmitter means for transmitting to said plurality of stations in response to the reception of said first radio frequency signal.
Claim 12
Dependent Claim
108 words
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.
Claim 13
Dependent Claim
108 words
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.
Claim 14
Dependent Claim
39 words
The radio communication system of claim 11 wherein said means for transmitting communicates with said plurality of stations using a second group of frequencies in response to said start-up signal and the absence of said first radio frequency signal.
References Cited (Backward Citations)
US4066964A
Cited
US4023103A
Cited
US4222115A
Cited
US4352201A
Cited
US4419765A
Cited
US4446564A
Cited
US4479226A
Cited
US4554668A
Cited
US4506384A
Cited
US4644347A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-10-02 | 1993-04-03 | 1993-10-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-10-02 | 1997-04-03 | 1997-10-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-10-02 | 2001-04-03 | 2001-10-03 | $7700.00 | Window Closed / Lapsed |