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WO2016035937A1 - Dispositif et procédé de synchronisation pour une horloge - Google Patents

Dispositif et procédé de synchronisation pour une horloge Download PDF

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Publication number
WO2016035937A1
WO2016035937A1 PCT/KR2014/011455 KR2014011455W WO2016035937A1 WO 2016035937 A1 WO2016035937 A1 WO 2016035937A1 KR 2014011455 W KR2014011455 W KR 2014011455W WO 2016035937 A1 WO2016035937 A1 WO 2016035937A1
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WO
WIPO (PCT)
Prior art keywords
signal
gps
ntp
clock
reference clock
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.)
Ceased
Application number
PCT/KR2014/011455
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English (en)
Korean (ko)
Inventor
조희창
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.)
CONTELA Inc
Original Assignee
CONTELA 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 CONTELA Inc filed Critical CONTELA Inc
Publication of WO2016035937A1 publication Critical patent/WO2016035937A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L7/00—Arrangements for synchronising receiver with transmitter
    • H04L7/04—Speed or phase control by synchronisation signals

Definitions

  • the present invention relates to a clock synchronization technique, and more particularly, to an apparatus and method for synchronizing clocks to provide a stable service in a communication system.
  • a clock In a communication entity such as a base station, a terminal, and the like, a clock is degraded in accuracy and precision due to inherent instability, environmental factors, and arbitrary modification by a user.
  • Precise time protocol (PTP) ie IEEE 1588
  • NTP network time protocol
  • GPS global positioning system
  • the NTP-based clock synchronization method may be used for clock synchronization between a server and a client terminal.
  • the NTP-based clock synchronization method is a method of applying a phase lock method to synchronize clocks under a reliable error range by exchanging messages with servers or subnet peers.
  • the GPS based clock synchronization method may be classified into a stand-alone (GPS) -based clock synchronization method, an A (assisted) -GPS-based clock synchronization method, and the like.
  • a communication entity may track a satellite on its own and synchronize a clock based on a GPS signal obtained from the tracked satellite.
  • the A-GPS based clock synchronization method is intended to compensate for the shortcomings of the S-GPS based clock synchronization method.
  • the communication entity may acquire a GPS signal from a GPS server and synchronize a clock based on the acquired GPS signal.
  • the NTP-based clock synchronization method communication entities can easily synchronize their clocks if a network environment is established.
  • the clock synchronization obtained through the NTP-based clock synchronization method has a lower precision than the clock synchronization obtained through the GPS-based clock synchronization method.
  • the communication entity may not receive the GPS signal.
  • the GPS signal is refracted and reflected due to the terrain and features around the communication object, which may cause errors in the GPS signal.
  • a GPS receiving antenna for receiving a GPS signal can be used.
  • the communication entity may not properly receive a GPS signal.
  • An object of the present invention for solving the above problems is to provide an apparatus for synchronizing the clock based on GPS and NTP.
  • Another object of the present invention for solving the above problems is to provide a method for synchronizing clocks based on GPS and NTP.
  • GPS reference for detecting a GPS signal
  • a reference clock is set based on the NTP signal obtained from the NTP server
  • the GPS signal from the GPS receiver The processor may include a processor configured to reset a reference clock based on the GPS signal, and an oscillator configured to generate a frequency based on the reference clock obtained from the processor.
  • the GPS receiver may detect the GPS signal based on a reference clock set based on the NTP signal.
  • the processor may provide the oscillator with a reference clock reset based on the GPS signal when the GPS signal is acquired.
  • the processor may provide a reference clock set based on the NTP signal when the GPS signal is not obtained.
  • a clock synchronization method performed by a communication entity, the method comprising: setting a reference clock based on an NTP signal, detecting a GPS signal, and detecting the GPS signal. Resetting the reference clock based on the GPS signal, and generating a frequency based on the reset reference clock.
  • the GPS signal may be detected based on a reference clock set based on the NTP signal.
  • the clock synchronization method may further include generating a frequency based on a reference clock set based on the NTP signal when the GPS signal is not detected.
  • the clock synchronization method may further include generating a frequency based on a reference clock set based on the NTP signal when the detection of the GPS signal fails after generating the frequency.
  • the communication entity may synchronize the clock based on the NTP. That is, the communication entity can efficiently synchronize the clock by operating the GPS and NTP together, thereby providing a stable and reliable communication service.
  • FIG. 1 is a block diagram illustrating a clock synchronization device according to an embodiment of the present invention.
  • FIG. 2 is a flowchart illustrating a clock synchronization method according to an embodiment of the present invention.
  • first and second may be used to describe various components, but the components should not be limited by the terms. The terms are used only for the purpose of distinguishing one component from another.
  • the first component may be referred to as the second component, and similarly, the second component may also be referred to as the first component.
  • a network may include, for example, a wireless Internet such as wireless fidelity (WiFi), a mobile Internet such as wireless broadband internet (WiBro) or world interoperability for microwave access (WiMax), a global system for mobile communication ) Or 2G mobile networks such as code division multiple access (CDMA), wideband code division multiple access (WCDMA) or 3G mobile networks such as CDMA2000, high speed downlink packet access (HSDPA) or high speed uplink packet access (HSUPA).
  • a 4G mobile communication network such as a 3.5G mobile communication network, a long term evolution (LTE) network, or an LTE-Advanced network, and a 5G mobile communication network may be included.
  • a terminal may be a mobile station, a mobile terminal, a subscriber station, a portable subscriber station, a user equipment, or an access terminal. Etc., and may include all or part of the functions of a terminal, a mobile station, a mobile terminal, a subscriber station, a portable subscriber station, a user device, an access terminal, and the like.
  • a desktop computer a laptop computer, a tablet PC, a wireless phone, a mobile phone, a smart phone, a smart watch capable of communicating with the terminal (smart watch), smart glass, e-book reader, portable multimedia player (PMP), portable game console, navigation device, digital camera, digital multimedia broadcasting (DMB) player, digital voice Digital audio recorder, digital audio player, digital picture recorder, digital picture player, digital video recorder, digital video player ) Can be used.
  • PMP portable multimedia player
  • DMB digital multimedia broadcasting
  • a base station may include an access point, a radio access station, a node B, an evolved nodeB, a base transceiver station, and an MMR. mobile multihop relay) -BS and the like, and may include all or part of a function of a base station, an access point, a wireless access station, a NodeB, an eNodeB, a base transceiver station, an MMR-BS, and the like.
  • FIG. 1 is a block diagram illustrating a clock synchronization device according to an embodiment of the present invention
  • FIG. 2 is a flowchart illustrating a clock synchronization method according to an embodiment of the present invention.
  • the clock synchronizing apparatus 100 may refer to a communication entity such as a base station, a terminal, or the like in a communication system.
  • the clock synchronization apparatus 100 may include a clock processor 10, a GPS (global positioning system) receiver 20, a GPS antenna 30, an oscillator 40, a baseband physical (PHY) layer processor ( 50 and a radio frequency (RF) processor 60.
  • a clock processor 10 may include a clock processor 10, a GPS (global positioning system) receiver 20, a GPS antenna 30, an oscillator 40, a baseband physical (PHY) layer processor ( 50 and a radio frequency (RF) processor 60.
  • GPS global positioning system
  • PHY baseband physical
  • RF radio frequency
  • the clock processor 10 may include a phase locked loop (PLL) circuit.
  • the oscillator 40 may mean a voltage controlled oscillator (VCO).
  • the clock processor 10 may receive an NTP signal from a network time prorocol (NTP) server 200 (S100).
  • NTP network time prorocol
  • the clock processor 10 may set a reference clock based on the NTP signal received from the NTP server 200 (S110).
  • the clock processor 10 may provide a reference clock set based on the NTP signal to the GPS receiver 20, the oscillator 40, and the like.
  • the reference clock reset based on the NTP signal may be provided to the oscillator 40 after being converted through a digital analog converter (DAC).
  • DAC digital analog converter
  • the GPS receiver 20 may be driven simultaneously with the clock processor 10 and may detect a GPS signal received through the GPS antenna 30 (S120).
  • the GPS receiver 20 may detect the GPS signal based on the reference clock obtained from the clock processor 10. That is, the NTP signal may be detected faster than the GPS signal.
  • the GPS receiver 20 may detect the GPS signal using a reference clock set based on the NTP signal.
  • the GPS receiver 20 may detect a GPS signal based on a standalone (GPS) scheme. That is, the GPS receiver 20 may track the satellite itself based on the GPS antenna 30, and detect the GPS signal from the tracked satellite. Alternatively, the GPS receiver 20 may detect a GPS signal based on the A (assisted) -GPS scheme. That is, the GPS receiver 20 may detect the GPS signal transmitted from the GPS server based on the GPS antenna or the wire.
  • GPS GPS
  • the GPS receiver 20 may transmit the detected GPS signal to the clock processor 10.
  • the GPS receiver 20 may transmit a GPS signal to the clock processor 10 based on a serial peripheral interface (SPI) method or an inter-integrated circuit (I2C) method.
  • SPI serial peripheral interface
  • I2C inter-integrated circuit
  • the connection relationship between the clock processor 10 and the GPS receiver 20 is not limited by the above description. That is, the GPS receiver 20 may transmit the GPS signal to the clock processor 10 based on a communication method other than the SPI method and the I2C method.
  • the clock processor 10 may reset the reference clock based on the GPS signal (S130). That is, the clock processor 10 may reset the reference clock set based on the NTP signal based on the GPS signal. Since the reference clock set based on the GPS signal is more accurate than the reference clock set based on the NTP signal, the clock processor 10 finally resets the reference clock based on the GPS signal when both the NTP signal and the GPS signal are received. Can be.
  • the clock processor 10 may continuously acquire the NTP signal from the NTP server 200 even when the GPS signal is received. The reason is to set the reference clock based on the NTP signal when the reference signal based on the GPS signal is unlocked.
  • the clock processor 10 may provide the oscillator 40 with a reference clock reset based on the GPS signal.
  • the reference clock reset based on the GPS signal may be provided to the oscillator 40 after being converted through the DAC.
  • the oscillator 40 may generate a frequency based on the received reference clock based on the GPS signal (S140).
  • the frequency generated by the oscillator 40 may be provided to the GPS receiver 20, the baseband physical layer processor 50, the RF processor 60, and the like.
  • the clock processor 10 provides the oscillator 40 with the reference clock set based on the NTP signal. can do.
  • the oscillator 40 may generate a frequency using a reference clock based on the NTP signal.
  • the clock processor 10 may determine that the GPS receiver 20 has failed to detect the GPS signal. In this case, the clock processor 10 may provide the oscillator 40 with a reference clock set based on the NTP signal. In this case, the reference clock reset based on the NTP signal may be provided to the oscillator 40 after being converted through the DAC.
  • the oscillator 40 may generate a frequency based on the received reference clock based on the NTP signal (S150). The frequency generated by the oscillator 40 may be provided to the GPS receiver 20, the baseband physical layer processor 50, the RF processor 60, and the like.
  • the clock processor 10 may provide the oscillator 40 with a reference clock set based on the GPS signal. In this case, the oscillator 40 may generate a frequency using a reference clock based on the GPS signal. In addition, when a frequency is generated based on an NTP signal-based reference clock and the NTP signal-based reference clock is unlocked and a GPS signal is detected, the clock processor 10 may oscillate the reference clock set based on the GPS signal. 40 can be provided. In this case, the oscillator 40 may generate a frequency using a reference clock based on the GPS signal.
  • the methods according to the invention can be implemented in the form of program instructions that can be executed by various computer means and recorded on a computer readable medium.
  • Computer-readable media may include, alone or in combination with the program instructions, data files, data structures, and the like.
  • the program instructions recorded on the computer readable medium may be those specially designed and constructed for the present invention, or may be known and available to those skilled in computer software.
  • Examples of computer readable media include hardware devices that are specifically configured to store and execute program instructions, such as ROM, RAM, flash memory, and the like.
  • Examples of program instructions include machine language code, such as produced by a compiler, as well as high-level language code that can be executed by a computer using an interpreter or the like.
  • the hardware device described above may be configured to operate with at least one software module to perform the operations of the present invention, and vice versa.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Position Fixing By Use Of Radio Waves (AREA)

Abstract

La présente invention concerne un dispositif et un procédé de synchronisation pour une horloge. Le dispositif de synchronisation d'horloge comprend : une unité de réception GPS permettant de détecter des signaux GPS ; une unité de traitement permettant de régler une horloge de référence sur la base d'un signal NTP acquis d'un serveur NTP et de réinitialiser l'horloge de référence sur la base d'un signal GPS lorsque le signal GPS est acquis par une unité de réception GPS ; et une unité d'oscillation permettant de générer une fréquence sur la base de l'horloge de référence acquise par l'unité de traitement. Par conséquent, l'emploi conjoint de GPS et NTP permet de synchroniser efficacement une horloge.
PCT/KR2014/011455 2014-09-04 2014-11-27 Dispositif et procédé de synchronisation pour une horloge Ceased WO2016035937A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
KR1020140117730A KR20160028773A (ko) 2014-09-04 2014-09-04 클록의 동기화 장치 및 방법
KR10-2014-0117730 2014-09-04

Publications (1)

Publication Number Publication Date
WO2016035937A1 true WO2016035937A1 (fr) 2016-03-10

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PCT/KR2014/011455 Ceased WO2016035937A1 (fr) 2014-09-04 2014-11-27 Dispositif et procédé de synchronisation pour une horloge

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WO (1) WO2016035937A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR102865233B1 (ko) * 2023-08-25 2025-09-25 한전케이디엔주식회사 원자력발전소 ps-lte 망을 이용한 gps 신호생성 시스템

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100706763B1 (ko) * 2006-08-16 2007-04-13 맥슨씨아이씨 주식회사 Ｅ1/ｔ1 신호를 이용하여 시각 동기 정보를 송수신하는클럭 공급 장치 및 그 방법
US20070177605A1 (en) * 2006-01-30 2007-08-02 Benco David S Method for utilizing a backup timing source when GPS becomes nonfunctional
JP2009192277A (ja) * 2008-02-12 2009-08-27 Softbank Mobile Corp 高精度時刻同期装置、高精度時刻同期方法、およびプログラム
US20110279317A1 (en) * 2010-05-13 2011-11-17 Qualcomm Incorporated High sensitivity satellite positioning system receiver
KR101128491B1 (ko) * 2011-10-27 2012-03-28 동일테크주식회사 지진 감시 시스템

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20070177605A1 (en) * 2006-01-30 2007-08-02 Benco David S Method for utilizing a backup timing source when GPS becomes nonfunctional
KR100706763B1 (ko) * 2006-08-16 2007-04-13 맥슨씨아이씨 주식회사 Ｅ1/ｔ1 신호를 이용하여 시각 동기 정보를 송수신하는클럭 공급 장치 및 그 방법
JP2009192277A (ja) * 2008-02-12 2009-08-27 Softbank Mobile Corp 高精度時刻同期装置、高精度時刻同期方法、およびプログラム
US20110279317A1 (en) * 2010-05-13 2011-11-17 Qualcomm Incorporated High sensitivity satellite positioning system receiver
KR101128491B1 (ko) * 2011-10-27 2012-03-28 동일테크주식회사 지진 감시 시스템

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