CA2491900A1 - Time-division synchronous wireless modem device - Google Patents

Time-division synchronous wireless modem device Download PDF

Info

Publication number
CA2491900A1
CA2491900A1 CA002491900A CA2491900A CA2491900A1 CA 2491900 A1 CA2491900 A1 CA 2491900A1 CA 002491900 A CA002491900 A CA 002491900A CA 2491900 A CA2491900 A CA 2491900A CA 2491900 A1 CA2491900 A1 CA 2491900A1
Authority
CA
Canada
Prior art keywords
communication
time
cycle period
transmission cycle
slots
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
CA002491900A
Other languages
French (fr)
Other versions
CA2491900C (en
Inventor
Yasumasa Nonoyama
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.)
Mitsubishi Electric Corp
Original Assignee
Mitsubishi Electric Corp
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 Mitsubishi Electric Corp filed Critical Mitsubishi Electric Corp
Publication of CA2491900A1 publication Critical patent/CA2491900A1/en
Application granted granted Critical
Publication of CA2491900C publication Critical patent/CA2491900C/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/24—Radio transmission systems, i.e. using radiation field for communication between two or more posts
    • H04B7/26—Radio transmission systems, i.e. using radiation field for communication between two or more posts at least one of which is mobile
    • H04B7/2643—Radio transmission systems, i.e. using radiation field for communication between two or more posts at least one of which is mobile using time-division multiple access [TDMA]
    • 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
    • H04B7/18502—Airborne stations
    • H04B7/18506—Communications with or from aircraft, i.e. aeronautical mobile service
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/24—Radio transmission systems, i.e. using radiation field for communication between two or more posts
    • H04B7/26—Radio transmission systems, i.e. using radiation field for communication between two or more posts at least one of which is mobile
    • H04B7/2662—Arrangements for Wireless System Synchronisation
    • H04B7/2671—Arrangements for Wireless Time-Division Multiple Access [TDMA] System Synchronisation
    • H04B7/2678—Time synchronisation
    • H04B7/2687—Inter base stations synchronisation
    • H04B7/2693—Centralised synchronisation, i.e. using external universal time reference, e.g. by using a global positioning system [GPS] or by distributing time reference over the wireline network
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/14—Reselecting a network or an air interface
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/24—Radio transmission systems, i.e. using radiation field for communication between two or more posts
    • H04B7/26—Radio transmission systems, i.e. using radiation field for communication between two or more posts at least one of which is mobile
    • H04B7/2662—Arrangements for Wireless System Synchronisation
    • H04B7/2671—Arrangements for Wireless Time-Division Multiple Access [TDMA] System Synchronisation
    • H04B7/2678—Time synchronisation
    • H04B7/2681—Synchronisation of a mobile station with one base station

Abstract

An object of this invention is to provide a time-division synchronous wireless modem device which is highly efficient in using communication slots. The time-division synchronous wireless modem device according to this invention is provided at each of a plurality of wireless stations in a wireless system which transmits and receives communication packets containing a header between the individual wireless stations via one wireless channel by using, on a one-by-one basis, any of communication slots obtained through time division of a predetermined transmission cycle period by a predetermined unit transmission time, and includes: a modem unit which transmits and receives the communication packet; a communication state determination unit which obtains a transmission cycle period and a vacant communication slot from information contained in the header of the received communication packet; and a transmission timing controller which selectively determines an arbitrary one of the communication slots in a next transmission cycle period when the communication packet is not received during the entire span of the one transmission cycle period, or selectively determines the one of the communication slots to be used by estimating a vacant one of the communication slots in the next transmission cycle period from the header of the communication packets when the communication packet is received.
CA002491900A 2003-09-30 2003-09-30 Time-division synchronous wireless modem device Expired - Fee Related CA2491900C (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/JP2003/012544 WO2005034399A1 (en) 2003-09-30 2003-09-30 Time-division synchronization radio modem apparatus

Publications (2)

Publication Number Publication Date
CA2491900A1 true CA2491900A1 (en) 2005-03-30
CA2491900C CA2491900C (en) 2007-12-04

Family

ID=34401441

Family Applications (1)

Application Number Title Priority Date Filing Date
CA002491900A Expired - Fee Related CA2491900C (en) 2003-09-30 2003-09-30 Time-division synchronous wireless modem device

Country Status (8)

Country Link
US (1) US7693127B2 (en)
JP (1) JP4246203B2 (en)
CN (1) CN100566220C (en)
AU (2) AU2003304646A1 (en)
CA (1) CA2491900C (en)
GB (1) GB2416464B (en)
TW (1) TWI256262B (en)
WO (1) WO2005034399A1 (en)

Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8576829B2 (en) * 2006-08-08 2013-11-05 Aeroscout, Ltd. Multi-channel TDOA system
TW200849886A (en) * 2007-06-15 2008-12-16 D Link Corp Network device with display module
US7831259B2 (en) * 2007-06-22 2010-11-09 Cisco Technology, Inc. Sharing and tracking real-time location for mobile users
WO2010013493A1 (en) * 2008-07-31 2010-02-04 三洋電機株式会社 Notifying method, and access control device
US8606508B2 (en) * 2012-02-09 2013-12-10 Flightaware, Llc System and method for sending air traffic data to users for display
US20140003024A1 (en) * 2012-06-29 2014-01-02 Airbus Operations Gmbh Modular mobile platform for use with commerical devices
US9298577B2 (en) * 2012-09-19 2016-03-29 Toyota Jidosha Kabushiki Kaisha Predicting bus idle time based on obtained usage data of a bus
EP3700248A1 (en) 2014-10-03 2020-08-26 Telefonaktiebolaget LM Ericsson (publ) Measurement procedures for operation in unlicensed spectrum
RU2758033C2 (en) * 2016-11-29 2021-10-25 Инейблер, Лтд. Time synchronization system and transmission device
US10362593B2 (en) * 2017-09-01 2019-07-23 Huawei Technologies Co., Ltd. Grant-free uplink transmission in unlicensed spectrum
US10892818B2 (en) * 2019-05-07 2021-01-12 Contec Co., Ltd. System, apparatus and method for managing satellite operation service

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3093243B2 (en) * 1990-07-12 2000-10-03 株式会社東芝 Mobile radio communication system
JPH08130774A (en) * 1994-10-28 1996-05-21 Clarion Co Ltd Data transmission system
JP3483017B2 (en) * 1995-06-07 2004-01-06 日本電信電話株式会社 Data communication method and system
US6377548B1 (en) * 1997-10-14 2002-04-23 Lucent Technologies Inc. Method for admitting new connections based on measured quantities in a multiple access system for communications networks
US6862622B2 (en) * 1998-07-10 2005-03-01 Van Drebbel Mariner Llc Transmission control protocol/internet protocol (TCP/IP) packet-centric wireless point to multi-point (PTMP) transmission system architecture
KR20020079725A (en) * 1999-09-01 2002-10-19 모토로라 인코포레이티드 Method and device for bandwidth allocation in multiple access protocols with contention-based reservation
US6993007B2 (en) * 1999-10-27 2006-01-31 Broadcom Corporation System and method for suppressing silence in voice traffic over an asynchronous communication medium
JP4316749B2 (en) * 1999-11-16 2009-08-19 株式会社日立コミュニケーションテクノロジー Wireless synchronization method
JP2003143056A (en) * 2001-11-05 2003-05-16 Uniden Corp Radio terminal, radio synchronization system having no reference station, and program therefor

Also Published As

Publication number Publication date
TWI256262B (en) 2006-06-01
WO2005034399A1 (en) 2005-04-14
TW200513127A (en) 2005-04-01
JP4246203B2 (en) 2009-04-02
JPWO2005034399A1 (en) 2006-12-14
CN100566220C (en) 2009-12-02
AU2003304646A1 (en) 2005-04-21
GB0504872D0 (en) 2005-04-13
GB2416464B (en) 2008-02-13
CN1685648A (en) 2005-10-19
GB2416464A (en) 2006-01-25
CA2491900C (en) 2007-12-04
US20060165113A1 (en) 2006-07-27
US7693127B2 (en) 2010-04-06
AU2003304454B1 (en) 2007-10-18

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