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Patent USRE28577E successfully refreshed from Google Patents.
USRE28577E
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Channel reallocation system and method
Assignee: International Telecommunications Satellite Organization
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Filing: 1973-11-21
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Granted: 1975-10-21
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Expires: 1993-11-21
Abstract
Abstract In a time division multiple access communications system having multiple ground stations and a satellite for communicating signals between ground stations, the channels are periodically reallocated among the several ground stations based upon the traffic load at the time of reallocation. At the reallocation time, a slack group of channels, representing presently available channels, are distributed among the ground stations. The time of the periodic transmission (hereinafter referred to as transmission burst) from each ground station is shifted in time with respect to the time of the transmission burst from a reference station to accommodate the reallocation of channels. The transmission burst times of all stations are not shifted simultaneously but are shifted in accordance with a set of rules which prevents overlapping between transmission bursts from adjacent stations.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 17:49
CPC Classifications
H; H04; H04B; H04B7/00; H04B7/14; H04B7/15; H04B7/204; H04B7/212; H04B7/2121; H04B7/2123
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
48 words
The method of reallocating channels to multiple stations in a communications system comprising the steps of, a. establishing a value A for each station, where Am is the number of channels to be allocated to station m, b. generating a value sigma 1 for each station i where
Claim 2
Independent Claim
48 words
The method of reallocating channels to multiple stations in a communications system comprising the steps of, a. establishing a value A for each station, where Am is the number of channels to be allocated to station m, b. generating a value sigma 1 for each station i where
Claim 3
Dependent Claim
156 words
The method as claimed in claim 1 wherein the step of adjusting the start time of the transmission burst of station i comprises a. storing at least the algebraic signs of sigma for each station, b. periodically sampling said stored algebraic signs, c. erasing the stored sign for sigma k where k designates any station at the sampling period when the sign of sigma k represents forward movement in time and the sign of sigma k 1 represents backward or no movement in time, d. erasing the stored sign for sigma k at the sampling period when the sign of sigma k represents backward movement in time and the sign of sigma k 1 represents forward or no movement in time, and e. transferring the value sigma i to a burst syncronization control apparatus at station i at the sampling period when either of the conditions of steps (c) and (d) are satisfied for k i.
Claim 4
Dependent Claim
95 words
The method as claimed in claim 2 wherein the step of generating comprises a. storing respective values B, representing respective current channel allocation, for each station, b. subtracting respective values B from respective values A for each station to obtain respective difference values Delta , for each station c. algebraically adding, for each station, the difference values Delta obtained in step (b) for all stations which preceed said each station in the order of stations, the order of stations being the order of occurrence of the station bursts with respect to a reference station burst.
Claim 5
Dependent Claim
111 words
The method as claimed in claim 3 wherein the step of establishing a value A for each station comprises a. receiving from each station a respective request number RQT, representing that station''s present channel usage b. summing all request numbers and subtracting the sum from the total number of channels in the system to obtain a number representing remaining channels to be allocated c. adding a number of channels P to each RQT to form the numbers A, wherein P is not necessarily the same for each RQT to which it is added, and the sum of all P''s is equal to or less than the number representing the remaining channels.
Claim 6
Dependent Claim
89 words
The method as claimed in claim 3 wherein the step of establishing a value A for each station comprises a. receiving from each station a request number RQT, representing that station''s present channel usage b. summing all request numbers and subtracting the sum from the total number of channels in the system to obtain a number representing remaining channels to be allocated, c. dividing the number of remaining channels by the total number of stations in the system and adding the integral dividend to each of said request numbers.
Claim 7
Dependent Claim
134 words
In a TDMA satellite communications system of the type having multiple stations which transmit non-overlapping bursts of information, one per station per frame, with each burst including multiple data channels for transmission of data, and one burst from one station representing a reference burst, the method comprising the steps of: a. determining the present usage of channels by the stations transmitting bursts of information, b. reassigning data channels among the said stations in dependence upon said present usage, c. calculating the adjustment in burst start times to accommodate the reassignment of data channels without having adjacent bursts overlap one another, and d. altering the initiation time of said bursts in accordance with said calculations, wherein the step of altering comprises, starting said alteration in an ordered sequence to prevent burst overlap during said alteration.
Claim 8
Dependent Claim
134 words
In a TDMA satellite communications system of the type having multiple stations which transmit non-overlapping bursts of information, one per station per frame, with each burst including multiple data channels for transmission of data, and one burst from one station representing a reference burst, the method comprising the steps of: a. determining the present usage of channels by the stations transmitting bursts of information, b. reassigning data channels among the said stations in dependence upon said present usage, c. calculating the adjustment in burst start times to accommodate the reassignment of data channels without having adjacent bursts overlap one another, and d. altering the initiation time of said bursts in accordance with said calculations, wherein the step of altering comprises, starting said alteration in an ordered sequence to prevent burst overlap during said alteration.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-10-20 | 1979-04-21 | 1979-10-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-10-20 | 1983-04-21 | 1983-10-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-10-20 | 1987-04-21 | 1987-10-21 | $7700.00 | Window Closed / Lapsed |