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AU2001237960A1 - Timing system and method for forward link diversity in mobile satellite systems - Google Patents

Timing system and method for forward link diversity in mobile satellite systems

Info

Publication number
AU2001237960A1
AU2001237960A1 AU2001237960A AU3796001A AU2001237960A1 AU 2001237960 A1 AU2001237960 A1 AU 2001237960A1 AU 2001237960 A AU2001237960 A AU 2001237960A AU 3796001 A AU3796001 A AU 3796001A AU 2001237960 A1 AU2001237960 A1 AU 2001237960A1
Authority
AU
Australia
Prior art keywords
downlink
downlink signal
region
user terminal
sent
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.)
Abandoned
Application number
AU2001237960A
Inventor
Peter D. Karabinis
Wail M. Refai
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.)
Ericsson Inc
Original Assignee
Ericsson Inc
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Ericsson Inc filed Critical Ericsson Inc
Publication of AU2001237960A1 publication Critical patent/AU2001237960A1/en
Abandoned legal-status Critical Current

Links

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
    • H04B7/185—Space-based or airborne stations; Stations for satellite systems
    • H04B7/1853—Satellite systems for providing telephony service to a mobile station, i.e. mobile satellite service
    • H04B7/18532—Arrangements for managing transmission, i.e. for transporting data or a signalling message
    • H04B7/18534—Arrangements for managing transmission, i.e. for transporting data or a signalling message for enhancing link reliablility, e.g. satellites diversity

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Astronomy & Astrophysics (AREA)
  • Aviation & Aerospace Engineering (AREA)
  • General Physics & Mathematics (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Radio Relay Systems (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Radio Transmission System (AREA)

Abstract

Downlink signal bursts are transmitted from a plurality of visible satellites to a plurality of user terminals in a downlink region that is serviced by the plurality of visible satellites. A first downlink signal burst is sent from a first one of the visible satellites to a first user terminal in the downlink region. A second downlink signal burst is sent from a second one of the visible satellites to the first user terminal to be received at a time that is a function of a separation distance of the first user terminal in the downlink region from the Time Alignment Center (TAC) of the downlink region. First downlink signal bursts and second downlink signal bursts also are sent to other user terminals in the downlink region. The first and second downlink signal bursts preferably are sent over respective first and second carrier frequencies. In preferred embodiments, the downlink signal bursts are transmitted in a plurality of repeating frames of downlink signal bursts of a predetermined frame repetition period. The second downlink signal burst is sent so that it will be received by the intended user terminal at a time offset from the first downlink signal burst that is one half the predetermined frame repetition period plus a delay time DeltaT that is a function of a separation distance of the first user terminal in the downlink region from the TAC of the downlink region.
AU2001237960A 2000-01-19 2001-01-18 Timing system and method for forward link diversity in mobile satellite systems Abandoned AU2001237960A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US09/488,058 US6788917B1 (en) 2000-01-19 2000-01-19 Timing systems and methods for forward link diversity in satellite radiotelephone systems
US09/488,058 2000-01-19
PCT/US2001/001791 WO2001054315A1 (en) 2000-01-19 2001-01-18 Timing system and method for forward link diversity in mobile satellite systems

Publications (1)

Publication Number Publication Date
AU2001237960A1 true AU2001237960A1 (en) 2001-07-31

Family

ID=23938160

Family Applications (1)

Application Number Title Priority Date Filing Date
AU2001237960A Abandoned AU2001237960A1 (en) 2000-01-19 2001-01-18 Timing system and method for forward link diversity in mobile satellite systems

Country Status (7)

Country Link
US (1) US6788917B1 (en)
EP (1) EP1249082B1 (en)
JP (1) JP2003524325A (en)
AT (1) ATE339039T1 (en)
AU (1) AU2001237960A1 (en)
DE (1) DE60122859T2 (en)
WO (1) WO2001054315A1 (en)

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Also Published As

Publication number Publication date
DE60122859T2 (en) 2007-09-06
JP2003524325A (en) 2003-08-12
EP1249082B1 (en) 2006-09-06
ATE339039T1 (en) 2006-09-15
DE60122859D1 (en) 2006-10-19
US6788917B1 (en) 2004-09-07
EP1249082A1 (en) 2002-10-16
WO2001054315A9 (en) 2002-10-24
WO2001054315A8 (en) 2001-10-25
WO2001054315A1 (en) 2001-07-26

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