CA2553935A1 - Base station synchronization for wireless communication systems - Google Patents

Base station synchronization for wireless communication systems Download PDF

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Publication number
CA2553935A1
CA2553935A1 CA002553935A CA2553935A CA2553935A1 CA 2553935 A1 CA2553935 A1 CA 2553935A1 CA 002553935 A CA002553935 A CA 002553935A CA 2553935 A CA2553935 A CA 2553935A CA 2553935 A1 CA2553935 A1 CA 2553935A1
Authority
CA
Canada
Prior art keywords
base station
timing
target base
neighboring
synchronization
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
CA002553935A
Other languages
French (fr)
Other versions
CA2553935C (en
Inventor
Stephen G. Dick
Eldad Zeira
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.)
InterDigital Technology Corp
Original Assignee
Interdigital Technology Corporation
Stephen G. Dick
Eldad Zeira
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 Interdigital Technology Corporation, Stephen G. Dick, Eldad Zeira filed Critical Interdigital Technology Corporation
Priority to CA2691637A priority Critical patent/CA2691637A1/en
Publication of CA2553935A1 publication Critical patent/CA2553935A1/en
Application granted granted Critical
Publication of CA2553935C publication Critical patent/CA2553935C/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
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/69—Spread spectrum techniques
    • H04B1/707—Spread spectrum techniques using direct sequence modulation
    • H04B1/7073—Synchronisation aspects
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W56/00—Synchronisation arrangements
    • H04W56/001—Synchronization between nodes
    • H04W56/002—Mutual synchronization
    • 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
    • H04B7/2668—Arrangements for Wireless Code-Division Multiple Access [CDMA] System Synchronisation
    • 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
    • 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
    • H04B7/269—Master/slave synchronisation
    • 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
    • H04J—MULTIPLEX COMMUNICATION
    • H04J3/00—Time-division multiplex systems
    • H04J3/02—Details
    • H04J3/06—Synchronising arrangements
    • H04J3/0635—Clock or time synchronisation in a network
    • H04J3/0638—Clock or time synchronisation among nodes; Internode synchronisation
    • H04J3/0641—Change of the master or reference, e.g. take-over or failure of the master
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W56/00—Synchronisation arrangements
    • H04W56/0055—Synchronisation arrangements determining timing error of reception due to propagation delay
    • H04W56/0065—Synchronisation arrangements determining timing error of reception due to propagation delay using measurement of signal travel time
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W56/00—Synchronisation arrangements
    • H04W56/0055—Synchronisation arrangements determining timing error of reception due to propagation delay
    • H04W56/0065—Synchronisation arrangements determining timing error of reception due to propagation delay using measurement of signal travel time
    • H04W56/007—Open loop measurement
    • H04W56/0075—Open loop measurement based on arrival time vs. expected arrival time
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B2201/00—Indexing scheme relating to details of transmission systems not covered by a single group of H04B3/00 - H04B13/00
    • H04B2201/69—Orthogonal indexing scheme relating to spread spectrum techniques in general
    • H04B2201/707—Orthogonal indexing scheme relating to spread spectrum techniques in general relating to direct sequence modulation
    • H04B2201/70702—Intercell-related aspects
    • 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
    • H04B7/2696—Over the air autonomous synchronisation, e.g. by monitoring network activity

Abstract

The present invention is a system and method for time synchronizing a plurality of base stations in a wireless communication system. The system determines an estimate of a timing accuracy associated with each base station. When a base stations's timing accuracy is over a threshold, the system determines if there is a neighboring base station with a better timing accuracy. The base station over the threshold is adjusted in response to an estimated difference between that base station and the neighboring base station.

Claims (13)

1. A method for synchronizing a plurality of base stations, the method characterized by the steps of:
identifying a target base station that is out of synchronization among the plurality of base stations;
selecting at least one neighboring base station that has better timing quality than the target base station;
measuring a timing difference between the target base station and the at least one neighboring one base station; and adjusting timing in the target base station based on said timing difference.
2. The method of claim 1 wherein the target base station transmits a signal for synchronization to the neighboring base station, and the neighboring base station determines said timing difference.
3. The method of claim 1 wherein the neighboring base station transmits a signal for synchronization to the target base station, and the target base station determines said timing difference.
4. The method of claim 1 wherein the target base station and the neighboring base station each transmit a signal for synchronization, and a user equipment determines said timing difference.
5. The method of claim 1 further comprising a step of periodically detecting end recording a timing variance between all base stations.
6. The method of claim 5 wherein the target base station is identified when the timing variance exceeds a predetermined threshold.
7. A radio network controller (RNC) for synchronizing a plurality of base stations, the RNC comprising:
means for identifying a target base station that is out of synchronization among the plurality of base stations;
means for identifying at least one neighboring base station having better timing quality that the target base station;
means for instructing measurement of a timing difference between the target base station and the neighboring base station; and means for adjusting timing in the target base station based on said timing difference.
8. The RNC of claim 7 wherein the means for detecting a target base station comprises:
a database for storing timing and timing quality information of the base stations;
means for tracking timing of the base stations; and means for calculating a timing variance between the base stations;
whereby the target base station is identified when the timing variance exceeds predetermined threshold.
9. A system for synchronizing a plurality of base stations in a communication system, the system characterized by:
at least one user equipment;
a target base station that is out of synchronization among the plurality of base stations;
at least one neighboring base station having better timing quality than the target base station; and a radio network controller for instructing measurement of a timing difference between the target base station and the neighboring base station, and adjusting timing in the target base station based on said timing difference.
10. The system of claim 9 wherein the target base station transmits a signal for synchronization to the neighboring base station, and the neighboring base station determines said timing difference.
11. The system of claim 9 wherein the neighboring base station transmits a signal for synchronization to the target base station, and the target base station determines said timing difference.
12. The system of claim 9 wherein both the target base station and the neighboring base station each transmit a signal for synchronization, and said user equipment determines said timing difference.
13. The system of claim 9 wherein the plurality of base stations are associated each other according to their timing quality, whether the timing accuracy of the base stations having lower timing quality depends on timing accuracy of the base stations having higher timing quality.
CA2553935A 2000-04-07 2001-04-05 Base station synchronization for wireless communication systems Expired - Fee Related CA2553935C (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CA2691637A CA2691637A1 (en) 2000-04-07 2001-04-05 Base station synchronization for wireless communication systems

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
US19554300P 2000-04-07 2000-04-07
US60/195,543 2000-04-07
US22340500P 2000-08-04 2000-08-04
US60/223,405 2000-08-04
CA002406438A CA2406438C (en) 2000-04-07 2001-04-05 Base station synchronization for wireless communication systems

Related Parent Applications (1)

Application Number Title Priority Date Filing Date
CA002406438A Division CA2406438C (en) 2000-04-07 2001-04-05 Base station synchronization for wireless communication systems

Related Child Applications (1)

Application Number Title Priority Date Filing Date
CA2691637A Division CA2691637A1 (en) 2000-04-07 2001-04-05 Base station synchronization for wireless communication systems

Publications (2)

Publication Number Publication Date
CA2553935A1 true CA2553935A1 (en) 2001-10-25
CA2553935C CA2553935C (en) 2010-06-01

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Family Applications (3)

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CA002406438A Expired - Fee Related CA2406438C (en) 2000-04-07 2001-04-05 Base station synchronization for wireless communication systems
CA2553935A Expired - Fee Related CA2553935C (en) 2000-04-07 2001-04-05 Base station synchronization for wireless communication systems
CA2691637A Abandoned CA2691637A1 (en) 2000-04-07 2001-04-05 Base station synchronization for wireless communication systems

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Country Status (19)

Country Link
US (6) US6961398B2 (en)
EP (3) EP1273111B9 (en)
JP (4) JP4846956B2 (en)
KR (3) KR100730549B1 (en)
CN (4) CN101005313B (en)
AT (1) ATE319236T1 (en)
AU (1) AU2001249854A1 (en)
BR (1) BRPI0110066B1 (en)
CA (3) CA2406438C (en)
DE (1) DE60117522T2 (en)
DK (2) DK1273111T3 (en)
ES (2) ES2475494T3 (en)
HK (4) HK1066342A1 (en)
IL (2) IL152104A (en)
MX (1) MXPA02009890A (en)
MY (3) MY137838A (en)
NO (2) NO326189B1 (en)
TW (4) TW511361B (en)
WO (1) WO2001080461A1 (en)

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