Patent US3353791A successfully refreshed from Google Patents.
EP0190771A2
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Method of initially establishing burst acquisition in TDMA satellite communications system and arrangement therefor
Assignee: NEC Corp
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Filing: 1986-02-10
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Granted: —
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Expires: 2006-02-10
Abstract
Abstract In order to initally establish burst acquisition in a TDMA satellite communications system, at least one of multiple earth stations (a first station) is controlled to instruct one of the other earth stations (a second station) to transmit an acquisition signal. The acquisition signal is transmitted in a continuous manner and has lower power than normal or full power. The first station receives the acquisition signal transmitted via a satellite transponder and detects a reference time point included in the received acquisition signal. Thereafter, the first station obtains a time difference between the reference time point and a received reference burst time point. The time difference intelligence is sent to the second station, which in turn transmits a burst at a time point determined by the transmitted time difference information.
Inventors
- 👤 Toshinori Hotta
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-26 22:38
CPC Classifications
H; H04; H04B; H04B7/00; H04B7/14; H04B7/15; H04B7/204; H04B7/212; H04B7/2125; Y; Y02; Y02D; Y02D30/00; Y02D30/70
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
222 words
A method of initially establishing burst acquisition in a TDMA satellite communications system using an acquisition signal wherein said TDMA satellite communications system includes one reference station and a plurality of traffic terminals, said acquisition signal having a period equal to a TDMA frame period or equal to a positive integer multiples of said TDMA frame and having first predetermined transmission power lower than second predetermined transmission power, said method comprising the steps of: controlling said reference station or one of said traffic terminals (a first earth station) to instruct one of the other traffic terminals (a second earth station) to trarsmit said acquisition signal; receiving, at said first earth station, the acquisition signal transmitted from said second earth station, detecting a first reference time point included in the received acquisition signal, and obtaining a time difference between said first reference time point and a second eference time point, said second reference time point lwing obtained by receiving a reference burst transmi:ted from said reference station; controlling said first earth station to inform said second earth station of information of said time difference; and establishing the burst acquisition of said second earth station by controlling said second earth station to transmit a burst having said second predetermined transmission power at a time point determined according to said information of said time difference.
Claim 2
Independent Claim
222 words
A method of initially establishing burst acquisition in a TDMA satellite communications system using an acquisition signal wherein said TDMA satellite communications system includes one reference station and a plurality of traffic terminals, said acquisition signal having a period equal to a TDMA frame period or equal to a positive integer multiples of said TDMA frame and having first predetermined transmission power lower than second predetermined transmission power, said method comprising the steps of: controlling said reference station or one of said traffic terminals (a first earth station) to instruct one of the other traffic terminals (a second earth station) to trarsmit said acquisition signal; receiving, at said first earth station, the acquisition signal transmitted from said second earth station, detecting a first reference time point included in the received acquisition signal, and obtaining a time difference between said first reference time point and a second eference time point, said second reference time point lwing obtained by receiving a reference burst transmi:ted from said reference station; controlling said first earth station to inform said second earth station of information of said time difference; and establishing the burst acquisition of said second earth station by controlling said second earth station to transmit a burst having said second predetermined transmission power at a time point determined according to said information of said time difference.
Claim 3
Dependent Claim
258 words
A TDMA satellite communications system which includes one reference station and a plurality of traffic terminals, said plurality of traffic terminals being controlled to initially access a satellite using an acquisition signal, said acquisition signal having a period equal to a TDMA frame period or equal to a positive integer multiples of said TDMA frame and having first predetermined transmission power lower than second predetermined transmission power, said TDMA satellite communications system including an arrangement provided in said reference station or one of said traffic terminals (a first earth station), said first earth station instructing one of the other traffic terminals (a second earth station) to transmit said acquisition signal for initially establishing burst acquisition of said second earth station, said arrangement comprising: a first means (410) for receiving said acquisition signal, said first means detecting a first reference time point of said acquistion signal; a second means (330) for receiving a reference burst transmitted from said reference station, said first means producing a second reference time point using said reference burst; a third means (420) coupled to said first means for receiving said first reference time point and being coupled to said second means for receiving said second reference time point, said third means obtaining a time difference between said first and second reference time points; a fourth means (430) coupled to said third means for transmitting information of said time difference applied therefrom to said second earth station; and a fifth means (400) coupled to said first, third and fourth means for controlling the operations thereof.
Claim 4
Dependent Claim
258 words
A TDMA satellite communications system which includes one reference station and a plurality of traffic terminals, said plurality of traffic terminals being controlled to initially access a satellite using an acquisition signal, said acquisition signal having a period equal to a TDMA frame period or equal to a positive integer multiples of said TDMA frame and having first predetermined transmission power lower than second predetermined transmission power, said TDMA satellite communications system including an arrangement provided in said reference station or one of said traffic terminals (a first earth station), said first earth station instructing one of the other traffic terminals (a second earth station) to transmit said acquisition signal for initially establishing burst acquisition of said second earth station, said arrangement comprising: a first means (410) for receiving said acquisition signal, said first means detecting a first reference time point of said acquistion signal; a second means (330) for receiving a reference burst transmitted from said reference station, said first means producing a second reference time point using said reference burst; a third means (420) coupled to said first means for receiving said first reference time point and being coupled to said second means for receiving said second reference time point, said third means obtaining a time difference between said first and second reference time points; a fourth means (430) coupled to said third means for transmitting information of said time difference applied therefrom to said second earth station; and a fifth means (400) coupled to said first, third and fourth means for controlling the operations thereof.
Claim 5
Dependent Claim
256 words
A TDMA satellite communications system which includes one reference station and a plurality of traffic terminals, said plurality of traffic terminals being controlled to initially access a satellite using an acquisition signal, said acquisition signal having a period equal to a TDMA frame period or equal to a positive integer multiples of said TDMA frame and having first predetermined transmission power lower than second predetermined transmission power, said TDMA satellite communications system being arragned such that said reference station or one of said traffic terminals (a first earth station) instructs one of the other traffic terminals (a second earth station) to transmit said acquisition signal for initially establishing burst acquisition of said second earth station, said second earth station comprising: a first means (330) for receiving a reference burst transmitted from said reference station, said first means producing a reference time point using said reference burst; a second means (360) for receiving instructions, transmitted from said first earth station, of sending out said acquistion signal from said second earth station; a third means (240, 380) coupled to said first means, said third means being arranged to control the transmission of said acquisition signal in synchronism with said reference time point wherein said acquisition signal assumes said first predetermined power; and a fourth means (230, 380) coupled to said second means for transmitting a burst from said second earth station to said first earth station at a time point determined by time difference information transmitted from said first earth station, said burst having said second predetermined power.
Claim 6
Dependent Claim
256 words
A TDMA satellite communications system which includes one reference station and a plurality of traffic terminals, said plurality of traffic terminals being controlled to initially access a satellite using an acquisition signal, said acquisition signal having a period equal to a TDMA frame period or equal to a positive integer multiples of said TDMA frame and having first predetermined transmission power lower than second predetermined transmission power, said TDMA satellite communications system being arragned such that said reference station or one of said traffic terminals (a first earth station) instructs one of the other traffic terminals (a second earth station) to transmit said acquisition signal for initially establishing burst acquisition of said second earth station, said second earth station comprising: a first means (330) for receiving a reference burst transmitted from said reference station, said first means producing a reference time point using said reference burst; a second means (360) for receiving instructions, transmitted from said first earth station, of sending out said acquistion signal from said second earth station; a third means (240, 380) coupled to said first means, said third means being arranged to control the transmission of said acquisition signal in synchronism with said reference time point wherein said acquisition signal assumes said first predetermined power; and a fourth means (230, 380) coupled to said second means for transmitting a burst from said second earth station to said first earth station at a time point determined by time difference information transmitted from said first earth station, said burst having said second predetermined power.
References Cited (Backward Citations)
No citation records indexed.
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