US3843843A
Expired / Lapsed
US
⏱️ 0.0 years remaining
A time division multiple access synchronization technique
Assignee: RCA Corp
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Filing: 1972-10-30
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Granted: 1974-10-22
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Expires: 1992-10-30
Abstract
Abstract A transmitting station gains access to a time division multiple access communication system without interferring with existing system communications by transmitting frequency shift modulated narrow band accessing signals to the system relay station which may be ground-based or in an orbiting satellite. By transmitting the accessing signals at a frequency located within the spectral null of the information signals being transmitted by the other stations in the system, the accessing signals can be processed to cause the signal transmission from the new station to occur in the correct time slot within the system time frame without interferring with the transmission of the other stations in the system.
Inventors
- 👤 K Solomon
- 👤 J Allen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 04:55
CPC Classifications
H; H04; H04B; H04B7/00; H04B7/14; H04B7/15; H04B7/204; H04B7/212; H04B7/2125; H04B7/2126
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
203 words
In a time division multiple access communication system having plural transmitting stations each assigned a time slot within a predetermined time frame for transmitting information signals at a predetermined frequency and power level to a relay station for relaying said signals to said system stations, a method for a new transmitting station to gain access to said communication system for transmitting information bursts to said relay station within a desired time slot without interferring with said information signals transmitted by said plural stations comprising the steps of: transmitting from said new station to said relay Station a predetermined number of frequency shift modulated narrow band accessing signals repetitive at the communication system frame rate and having a power level substantially lower than said predetermined power level at frequencies located within the spectral null of said information signals of said other stations, detecting at said new station said accessing signals and said information signals relayed by said relay station, comparing at said new station the position of said relayed accessing signals within said system time frame relative to said relayed information signals, and controlling the time of transmission of said accessing signals to correspond to said desired time slot within said system time frame.
Claim 2
Dependent Claim
203 words
In a time division multiple access communication system having plural transmitting stations each assigned a time slot within a predetermined time frame for transmitting information signals at a predetermined frequency and power level to a relay station for relaying said signals to said system stations, a method for a new transmitting station to gain access to said communication system for transmitting information bursts to said relay station within a desired time slot without interferring with said information signals transmitted by said plural stations comprising the steps of: transmitting from said new station to said relay Station a predetermined number of frequency shift modulated narrow band accessing signals repetitive at the communication system frame rate and having a power level substantially lower than said predetermined power level at frequencies located within the spectral null of said information signals of said other stations, detecting at said new station said accessing signals and said information signals relayed by said relay station, comparing at said new station the position of said relayed accessing signals within said system time frame relative to said relayed information signals, and controlling the time of transmission of said accessing signals to correspond to said desired time slot within said system time frame.
Claim 3
Dependent Claim
35 words
A method for a new station to gain access to a time division multiple access communication system according to claim 1 further comprising detecting at said new station the beginning of said system time frame.
Claim 4
Dependent Claim
44 words
A method for a new station to gain access to a time division multiple access communication system according to claim 2 further comprising detecting at said new station the occurrence of a predetermined number of frequency shifts of said frequency shift modulated accessing signals.
Claim 5
Dependent Claim
39 words
A method for a new station to gain access to a time division multiple access communication system according to claim 3 further comprising averaging the delay between said beginning of said system time frame and said frequency shift occurrence.
Claim 6
Dependent Claim
184 words
In a time division multiple access communication system having plural transmitting stations each assigned a time slot for transmitting information signals at a predetermined frequency and power level within a predetermined time frame to a relay station for relaying said signals to said system stations, an apparatus for a new transmitting station to gain access to said communication system for transmitting information bursts to said relay station within a desired time slot without interferring with said information signals transmitted by said plural stations comprising: a transmitter at said new station for transmitting to said relay station a predetermined number of frequency shift modulated narrow band accessing signals repetitive at the communication system frame rate and having a power level substantially lower than said predetermined power level at frequencies located within the spectral null of said information signals, and means for detecting at said new station the position within said system time frame of said accessing signals relayed by said relay station, means for controlling the time of transmission of said accessing signals to correspond to said desired time slot within said system time frame.
Claim 7
Dependent Claim
184 words
In a time division multiple access communication system having plural transmitting stations each assigned a time slot for transmitting information signals at a predetermined frequency and power level within a predetermined time frame to a relay station for relaying said signals to said system stations, an apparatus for a new transmitting station to gain access to said communication system for transmitting information bursts to said relay station within a desired time slot without interferring with said information signals transmitted by said plural stations comprising: a transmitter at said new station for transmitting to said relay station a predetermined number of frequency shift modulated narrow band accessing signals repetitive at the communication system frame rate and having a power level substantially lower than said predetermined power level at frequencies located within the spectral null of said information signals, and means for detecting at said new station the position within said system time frame of said accessing signals relayed by said relay station, means for controlling the time of transmission of said accessing signals to correspond to said desired time slot within said system time frame.
Claim 8
Dependent Claim
37 words
Apparatus for a new transmitting station to gain access to a time division multiple access communication system according to claim 5 further comprising means for detecting the beginning of said system time frame at said new station.
Claim 9
Dependent Claim
46 words
Apparatus for a new transmitting station to gain access to a time division multiple access communication system according to claim 6 further comprising means for detecting the occurrence of a predetermined number of frequency shifts of said frequency shift modulated accessing signals at said new station.
Claim 10
Dependent Claim
40 words
Apparatus for a new station to gain access to a time division multiple access communication system according to claim 7 further comprising means for averaging the delay between said beginning of said system time frame and said frequency shift occurrence.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-10-21 | 1978-04-22 | 1978-10-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-10-21 | 1982-04-22 | 1982-10-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-10-21 | 1986-04-22 | 1986-10-22 | $7700.00 | Window Closed / Lapsed |