CA2343096A1 - Method of and apparatus for time synchronization in a communication system - Google Patents

Method of and apparatus for time synchronization in a communication system Download PDF

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Publication number
CA2343096A1
CA2343096A1 CA002343096A CA2343096A CA2343096A1 CA 2343096 A1 CA2343096 A1 CA 2343096A1 CA 002343096 A CA002343096 A CA 002343096A CA 2343096 A CA2343096 A CA 2343096A CA 2343096 A1 CA2343096 A1 CA 2343096A1
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CA
Canada
Prior art keywords
time
signal
hub station
remote unit
signal quality
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
CA002343096A
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French (fr)
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CA2343096C (en
Inventor
Karl E. Moerder
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Tachyon Inc
Original Assignee
Tachyon, Inc.
Karl E. Moerder
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Filing date
Publication date
Application filed by Tachyon, Inc., Karl E. Moerder filed Critical Tachyon, Inc.
Publication of CA2343096A1 publication Critical patent/CA2343096A1/en
Application granted granted Critical
Publication of CA2343096C publication Critical patent/CA2343096C/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/14—Relay systems
    • H04B7/15—Active relay systems
    • H04B7/204—Multiple access
    • H04B7/212—Time-division multiple access [TDMA]
    • H04B7/2125—Synchronisation

Abstract

Time alignment of a signal from a remote unit (40) at a hub station (20) of a multiple access system is achieved based upon an initial time indication received from the hub station (20) at the remote unit (40) via a satellite (30). The remote unit (40) transmits a signal to the satellite (30), monitor s for a retransmission of the signal from the satellite (30) and measures the time difference between the outgoing and incoming signals. The remote unit (40), then, uses the time difference to more finely adjust the time alignmen t. Alternatively, the remote unit (40) transmits a first signal advanced with respect to an on-time estimate to the hub station (20) and receives a responsive energy indication from the hub station (20). The remote unit (40) transmits a second signal delayed with respect to the on-time estimate to th e hub station (20) and receives a responsive energy indication from the hub station (20). The remote unit (40) compares the two energy indications and adjusts the on-time estimate. In another embodiment, the remote unit (40') receives a compensated time indication from the hub station (20'). The remot e unit (40') compares the time indication with the time at which the indicatio n was actually received based upon a local, accurate time reference. The remot e unit (40') sets atransmission timer equal to the current time indicated by the local reference advanced by the difference between the time indication a nd the time which the time indication was received.

Claims (30)

1. A method of time aligning transmissions received from a plurality of remote units at a hub station, the method comprising:
transmitting a first data signal to a repeater from a first remote unit;
receiving a copy of said signal as transmitted by said repeater at said first remote unit;
determining a time difference between transmitting said signal and receiving said copy of said signal; and transmitting a second data signal using a timing advanced from a received time by a time increment, wherein said time increment is determined based upon said time difference.
2. The method of Claim 1, wherein said received time is received from said hub station over said repeater.
3. The method of Claim 1, wherein said first and second data signals are intended for reception by a said hub station.
4. The method of Claim 1, wherein said repeater is a satellite.
5. The method of Claim 1, wherein receiving said copy occurs at a different frequency than transmitting said first data signal.
6. A method of time aligning transmissions received from a plurality of remote units at a hub station, said method comprising:
transmitting a first signal from a first remote unit to said hub station, said first signal advanced by time .delta., with respect to an on-time estimate;
receiving a responsive advanced signal quality indication at said first remote unit from said hub station;
sending a second signal from said first remote unit to said hub station, said second signal retarded by time .delta., with respect to said on-time estimate;
receiving a responsive retarded signal quality indication at said first remote unit from said hub station; and advancing in time said on-time estimate if said responsive advanced signal quality indication indicates a better signal quality than said responsive retarded signal quality indication.
7. The method of Claim 6, further comprising retarding in time said on-time estimate if said responsive retarded signal quality indication indicates a better signal quality than said responsive advanced signal quality indication.
8. The method of Claim 6, wherein said responsive retarded signal quality indication and said responsive advanced signal quality indication are power level indications.
9. The method of Claim 6, wherein said first signal is a data signal.
10. The method of Claim 6, wherein said first signal is an overhead signal.
11. A method of time aligning transmissions received from a plurality of remote units at a hub station, said method comprising:
transmitting a first signal from a first remote unit to said hub station, said first signal advanced by time .delta., with respect to an on-time estimate;
determining an advanced signal quality indication at said hub station;
sending a second signal from said first remote unit to said hub station, said second signal retarded by time .delta., with respect to said on-time estimate;
determining a retarded signal quality indication at said hub station; and sending a command from said hub station to said remote unit to advance in time said on-time estimate if said advanced signal quality indication indicates a better signal quality than said retarded signal quality indication.
12. A method of time aligning transmissions received from a plurality of remote units at a hub station, said method comprising:
receiving at a hub station an indication of actual time;
transmitting a time tag transmission from said hub station to said plurality of remote units via a repeater, said time tag transmission indicating a time equal to said actual time offset by a current time delay estimate;

receiving a copy of said time tag transmission from said repeater at said hub station;
adjusting said current time delay estimate based upon the time at which said copy is received; and sending a subsequent time tag transmission based upon said adjusted current delay time estimate.
13. The method of Claim 12, wherein said repeater is a satellite.
14. The method of Claim 12, wherein receiving said copy occurs at a different frequency than transmitting said time tag transmission.
15. The method of Claim 12, wherein said receiving said copy is executed by a remote unit associated with said hub station.
16. An remote unit comprising:
a transmitter configured to transmit a signal to a repeater according to a transmission clock;
a receiver configured to receive a copy of said signal as transmitted by said repeater and configured to receive a time reference; and a time alignment module coupled to said transmitter and said receiver and configured to determine a time difference between transmission of said signal and reception of said copy of said signal and configured to adjust said transmission clock based upon said time difference and said time reference.
17. The remote unit of Claim 16, wherein said time reference is received from said hub station over said repeater.
18. The remote unit of Claim 16, wherein said signal is intended for reception by a said hub station.
19. The remote unit of Claim 16, wherein said repeater is a satellite.
20. A remote unit comprising:

a transmitter configured to transmit a first signal to said hub station, said first signal advanced in time by a time .delta., with respect to an on-time estimate and configured to transmit a second signal to said hub station, said second signal retarded by a time .delta., with respect to said on-time estimate;
a receiver configured to receive a responsive advanced signal quality indication from said hub station in response to said first signal and configured to receive a responsive retarded signal quality indication from said hub station in response to said second signal; and a timing module coupled to said transmitter and said receiver and configured to advance in time said on-time estimate if said responsive advanced signal quality indicates a higher signal quality than said responsive retarded signal quality.
21. The remote unit of Claim 20, wherein said timing module is further configured to retard in time said on-time estimate if said responsive retarded signal quality indication indicates a higher signal quality than said responsive advanced signal quality indication.
22. The remote unit of Claim 20, wherein said first signal is a data signal.
23. The remote unit of Claim 20, wherein said first signal is an overhead signal.
24. A hub station, comprising:
a receiver configured to receive an indication of actual time;
a transmitter configured to transmit a time tag transmission to said plurality of remote units via a repeater, said time tag transmission indicating a time equal said actual time offset by a current time delay estimate;
a receiver configured to receive a copy of said time tag transmission from said repeater;
and a time adjustment module coupled to said receiver, configured to receive said copy and configured to adjust said current time delay estimate based upon the time at which said copy is received;
wherein said transmitter is further configured to send a subsequent time tag transmission based upon said adjusted current delay time estimate.
25. The hub station of Claim 24, wherein said repeater is a satellite.
26. The hub station of Claim 24, wherein said receiver configured to receive said copy is located within a remote unit associated with said hub station.
27. An apparatus for time aligning transmissions received from a plurality of remote units at a hub station comprising:
means for transmitting a first data signal to a repeater from a first remote unit;
means for receiving a copy of said signal as transmitted by said repeater at said first remote unit;
means for determining a time difference between transmitting said signal and receiving said copy of said signal; and means for transmitting a second data signal using a timing advanced from a received time by a time increment, wherein said time increment is determined based upon said time difference.
28. An apparatus for time aligning transmissions received from a plurality of remote units at a hub station comprising:
means for transmitting a first signal from a first remote unit to said hub station, said first signal advanced by time .delta., with respect to an on-time estimate;
means for receiving a responsive advanced signal quality indication at said first remote unit from said hub station;
means for sending a second signal from said first remote unit to said hub station, said second signal retarded by time .delta., with respect to said on-time estimate;
means for receiving a responsive retarded signal quality indication at said first remote unit from said hub station; and means for advancing in time said on-time estimate if said responsive advanced signal quality indication indicates a better signal quality than said responsive retarded signal quality indication.
29. A apparatus for time aligning transmissions received from a plurality of remote units at a hub station comprising:
means for transmitting a first signal from a first remote unit to said hub station, said first signal advanced by time .delta., with respect to an on-time estimate;

means for determining an advanced signal quality indication at said hub station;
means for sending a second signal from said first remote unit to said hub station, said second signal retarded by time .delta., with respect to said on-time estimate;
means for determining a retarded signal quality indication at said hub station; and means for sending a command from said hub station to said remote unit to advance in time said on-time estimate if said advanced signal quality indication indicates a better signal quality than said retarded signal quality indication.
30. A apparatus for time aligning transmissions received from a plurality of remote units at a hub station comprising:
means for receiving at a hub station an indication of actual time;
means for transmitting a time tag transmission from said hub station to said plurality of remote units via a repeater, said time tag transmission indicating a time equal to said actual time offset by a current time delay estimate;
means for receiving a copy of said time tag transmission from said repeater at said hub station;
means for adjusting said current time delay estimate based upon the time at which said copy is received; and means for sending a subsequent time tag transmission based upon said adjusted current delay time estimate.
CA2343096A 1998-08-04 1999-07-21 Method of and apparatus for time synchronization in a communication system Expired - Fee Related CA2343096C (en)

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
US9534198P 1998-08-04 1998-08-04
US60/095,341 1998-08-04
US09/354,934 1999-07-15
US09/354,934 US6674730B1 (en) 1998-08-04 1999-07-15 Method of and apparatus for time synchronization in a communication system
PCT/US1999/016534 WO2000008780A1 (en) 1998-08-04 1999-07-21 Method of and apparatus for time synchronisation in a communication system

Publications (2)

Publication Number Publication Date
CA2343096A1 true CA2343096A1 (en) 2000-02-17
CA2343096C CA2343096C (en) 2012-01-03

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CA2343096A Expired - Fee Related CA2343096C (en) 1998-08-04 1999-07-21 Method of and apparatus for time synchronization in a communication system

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US (1) US6674730B1 (en)
EP (1) EP1138131B1 (en)
CN (1) CN1135740C (en)
AT (1) ATE293313T1 (en)
AU (1) AU5120999A (en)
CA (1) CA2343096C (en)
DE (1) DE69924754D1 (en)
MX (1) MXPA01002265A (en)
WO (1) WO2000008780A1 (en)

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EP1138131B1 (en) 2005-04-13
CA2343096C (en) 2012-01-03
AU5120999A (en) 2000-02-28
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CN1135740C (en) 2004-01-21
US6674730B1 (en) 2004-01-06
ATE293313T1 (en) 2005-04-15
EP1138131A1 (en) 2001-10-04
WO2000008780A1 (en) 2000-02-17
DE69924754D1 (en) 2005-05-19

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