WO2016045340A1 - Procédé de synchronisation d'horloge, unité de réseau optique et support d'informations - Google Patents

Procédé de synchronisation d'horloge, unité de réseau optique et support d'informations Download PDF

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Publication number
WO2016045340A1
WO2016045340A1 PCT/CN2015/075516 CN2015075516W WO2016045340A1 WO 2016045340 A1 WO2016045340 A1 WO 2016045340A1 CN 2015075516 W CN2015075516 W CN 2015075516W WO 2016045340 A1 WO2016045340 A1 WO 2016045340A1
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Prior art keywords
clock
synchronization
time value
value
local
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PCT/CN2015/075516
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English (en)
Chinese (zh)
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孙杰
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深圳市中兴微电子技术有限公司
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Publication of WO2016045340A1 publication Critical patent/WO2016045340A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J3/00—Time-division multiplex systems
    • H04J3/02—Details
    • H04J3/06—Synchronising arrangements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L7/00—Arrangements for synchronising receiver with transmitter

Definitions

  • the present invention relates to a clock synchronization technology, and in particular, to a clock synchronization method, an optical network unit, and a storage medium.
  • Ethernet Passive Optical Network (EPON) technology described in the IEEE 802.1as protocol uses the 1588 clock synchronization protocol.
  • the clock synchronization function implemented by the standard 1588 protocol relies heavily on the clock precision of the optical line terminal (OLT). If the clock accuracy of the OLT is not accurate, the OLT and the optical network unit (ONU, Optical Network Unit) have 1 pps pulse. There will be a fixed offset.
  • the standard 1588 protocol clock synchronization method requires the OLT to be equipped with an atomic clock, which increases the system cost; some Ethernet Passive Optical Network (EPON) systems do not have an atomic clock.
  • the OLT In order to use the 1pps signal of OLT and ONU to be "stubborn", the OLT needs to send the ONU 1588 protocol frame every second.
  • the ONU software must allocate 1588 parameters to the hardware every second. The worse the OLT clock is, the worse the OLT clock is.
  • the main purpose of the embodiment of the present invention is to provide a clock synchronization method and light
  • the network unit and the storage medium solve the problem that the existing clock synchronization method relies heavily on the accuracy of the OLT clock.
  • an embodiment of the present invention provides a clock synchronization method, where the method includes:
  • a pulse is issued based on the local clock.
  • the pre-calculating the speed value and the offset value of the current clock relative to the standard clock includes: connecting to receive N clock synchronization frames, and N is an integer not less than 2, each of the The clock synchronization frame includes three clock parameters: a time value of the multipoint control protocol and a corresponding second synchronization time value, and a nanosecond synchronization time value; and the current clock is calculated according to the clock parameters of the first clock synchronization frame and the last clock synchronization frame.
  • the speed and offset of the clock relative to the standard clock includes: connecting to receive N clock synchronization frames, and N is an integer not less than 2, each of the The clock synchronization frame includes three clock parameters: a time value of the multipoint control protocol and a corresponding second synchronization time value, and a nanosecond synchronization time value; and the current clock is calculated according to the clock parameters of the first clock synchronization frame and the last clock synchronization frame.
  • the speed and offset of the clock relative to the standard clock includes: connecting to receive N clock synchronization frames, and N
  • the calculating a fast value and an offset value of the current clock relative to the standard clock includes: calculating a difference between three clock parameters between the last clock synchronization frame and the first clock synchronization frame. The value is obtained by dividing the difference between the difference between the second synchronization time value and the nanosecond synchronization time value by the difference of the time values to obtain the number of nanoseconds corresponding to the current clock; and the nanosecond corresponding to the current clock. The number is compared with the standard nanoseconds to get the fast and slow values and offset values of the current clock relative to the standard clock.
  • the calibrating the local clock according to the fast and slow value and the offset value includes: if the fast and slow value indicates that the current clock is faster than the standard clock, the offset value is a clock period, the number of times of the local nanosecond timer is subtracted from one of the standard nanoseconds; if the fast and slow value indicates that the current clock is slower than the standard clock, every other offset of the clock period , adding the count of the local nanosecond timer to one of the standard nanoseconds number.
  • the generating a pulse based on the local clock is: the local nanosecond timer sends a pulse every second time.
  • the receiving a clock synchronization protocol packet, the clock parameter of the clock synchronization protocol packet is configured locally, and includes: receiving a clock synchronization protocol packet, and the clock synchronization protocol packet
  • the three clock parameters are included: a time value of the multipoint control protocol and a corresponding second synchronization time value, a nanosecond synchronization time value; and the time value, the second synchronization time value, and the nanosecond synchronization time value are configured locally;
  • the time value timer counts to the time value
  • the local second timer and the nanosecond timer are updated to the second synchronization time value and the nanosecond synchronization time value, respectively.
  • an embodiment of the present invention provides an optical network unit, where the optical network unit includes: a calculation module, a clock configuration module, a calibration module, and a sending module, where
  • a calculation module configured to pre-calculate a fast value and an offset value of the current clock relative to the standard clock
  • the clock configuration module is configured to receive a clock synchronization protocol packet, and configure a clock parameter of the clock synchronization protocol packet to be local;
  • a calibration module configured to calibrate the local clock according to the fast and slow values and offset values calculated by the computing module
  • a transmitting module configured to pulse based on the local clock.
  • an embodiment of the present invention provides a computer storage medium, where the computer storage medium stores computer executable instructions, and the computer executable instructions are used to execute the clock synchronization method provided by the first aspect of the present invention.
  • the calculation module includes an acquisition sub-module and a calculation sub-module, wherein the acquisition sub-module is configured to receive and receive N clock synchronization frames and parse and obtain a clock parameter, where N is not less than 2.
  • each of the clock synchronization frames includes three clock parameters: The time value of the point control protocol and the corresponding second synchronization time value and the nanosecond synchronization time value; the calculation submodule is configured to calculate according to the clock parameters of the first clock synchronization frame and the last clock synchronization frame obtained by the acquisition submodule. The fast and slow values and offset values of the current clock relative to the standard clock.
  • the calculating submodule is configured to calculate a difference between three clock parameters between a last clock synchronization frame and a first clock synchronization frame; Comparing the sum of the difference values of the nanosecond synchronization time values by the difference of the time values, obtaining the number of nanoseconds corresponding to the current clock; comparing the number of nanoseconds corresponding to the current clock with the standard number of nanoseconds, The fast and slow values and offset values of the current clock relative to the standard clock.
  • the calibration module is configured to: if the fast and slow value indicates that the current clock is faster than the standard clock, the local nanosecond timer is generated every the offset value clock cycle The number of timings minus one of the standard nanoseconds; if the fast and slow values indicate that the current clock is slower than the standard clock, the local nanosecond timer is clocked every other offset of the clock period The number is added to one of the standard nanoseconds.
  • the sending module is configured to emit a pulse every second time of the local nanosecond timer.
  • the clock configuration module is configured to receive a clock synchronization protocol packet, where the clock synchronization protocol packet includes three clock parameters: a time value of the multipoint control protocol and a corresponding second synchronization. a time value, a nanosecond synchronization time value; configuring the time value, the second synchronization time value, and the nanosecond synchronization time value to be local; when the time value timer counts to the time value, the local second The timer and the nanosecond timer are updated to the second synchronization time value and the nanosecond synchronization time value, respectively.
  • the clock synchronization method and the optical network unit and the storage medium provided by the embodiments of the present invention, wherein the fast and slow values and the offset values are calculated in advance, and the local clock is continuously calibrated based on the fast and slow values and the offset values during the clock synchronization, so that the clock of the ONU can be Maintain high-precision synchronization with the OLT's clock.
  • the OLT's clock comes from a non-precision atomic clock
  • the ONU's high-precision clock synchronization is achieved.
  • the OLT's clock accuracy is very poor, and the 1 pps pulse of the ONU and the OLT can be accurately synchronized. It can not only get rid of the atomic clock, but also reduce the CPU configuration of the ONU.
  • the CPU only needs to periodically equip the hardware with a clock (not as often as 1 second), so that the 1pps pulse of the OLT and the ONU can be accurately synchronized.
  • FIG. 1 is a schematic diagram of an architecture of an EPON system
  • FIG. 2 is a flow chart of a clock synchronization method according to an embodiment of the present invention.
  • FIG. 3 is a flowchart of a specific implementation of clock synchronization according to an embodiment of the present invention.
  • FIG. 4 is a schematic diagram showing the structure of an ONU according to an embodiment of the present invention.
  • the embodiment of the present invention can be applied to EPON, and provides a clock synchronization method for realizing ONU high-precision clock synchronization when the clock of the OLT is from a non-precision atomic clock.
  • the EPON clock synchronization system is mainly composed of OLT, ONU, and atomic clock.
  • the atomic clock is used to provide a high-precision clock (125M) for the OLT.
  • the OLT uses the clock provided by the atomic clock as the system clock.
  • the clock message sent by the OLT recovers the system clock as the ONU's own system clock.
  • the OLT will pulse every second, the ONU will also pulse at the second, and the ONU and OLT pulses should be sent at the same time.
  • the OLT does not use a precise atomic clock as the clock source, the ONU timer will accumulate a small deviation every cycle.
  • the final reflection is that the pulse sent by the ONU may have a fixed pulse from the OLT.
  • the clock synchronization method of the embodiment of the present invention can solve the above problem, and realize high-precision synchronization of the ONU under the EPON low-precision clock condition, which mainly includes three stages: 1) learning of the ONU initialization phase, mainly determining the bias required for calibration. Value shift; 2) ONU and OLT clock synchronization; 3) Continuous clock skew calibration during clock synchronization.
  • the clock synchronization method in the embodiment of the present invention may include:
  • Step 201 The ONU pre-calculates the fast and slow values and offset values of the current clock relative to the standard clock;
  • Step 202 The ONU receives the clock synchronization protocol packet, and configures the clock parameter of the clock synchronization protocol packet to the local device.
  • Step 203 The ONU calibrates the local clock according to the fast and slow values and the offset value.
  • Step 204 The ONU issues a pulse based on the local clock.
  • the clock synchronization method in the embodiment of the present invention is based on the standard 1588 protocol, and the specific processing flow is as shown in FIG. 3, including:
  • Step 301 The ONU starts, and after a learning phase, the clock deviation is calculated in advance.
  • the calculation method is:
  • MPCP Multi-Point Control Protocol
  • the three clock parameters of the first clock synchronization frame are respectively subtracted from the three clock parameters of the first clock synchronization frame, and the difference of the time value ⁇ T_tq, the difference of the second synchronization time value ⁇ T_sec, and the nanosecond synchronization are calculated.
  • the difference of the time values is ⁇ T_ns, and then the sum of ⁇ T_sec and ⁇ T_ns is divided by ⁇ T_tq to calculate the number of nanoseconds corresponding to the current clock; the calculated number of nanoseconds and the standard nanoseconds (theoretically The value should be 16) Comparison. If they are not the same, the current clock is inaccurate compared to the standard clock.
  • two values can be calculated based on the calculated nanoseconds and standard nanoseconds: One is to indicate whether the current clock is faster or slower than the standard clock. The value of the fast and slow, with - or +, - indicates that the current clock is faster than the standard clock, + indicates that the current clock is slower than the standard clock; second, if the current clock is used, it takes several clock cycles to achieve the standard nanometer The number of seconds, that is, the value of the offset value. If the calculated nanoseconds are the same as the standard nanoseconds, then the current clock is accurate, no calibration is required, and the offset value is taken as zero.
  • c 8/
  • , c, c (the unit is the clock period) is used to indicate the bias.
  • the shift value that is, the compensation period, indicates that the local clock compensates for the local timer (nanosecond timer) every c clock cycles.
  • the value of each compensation is related to the specific clock mode. If it is a 125M clock, the compensation value is 8ns.
  • N is an integer not less than 2, and the larger the N value, the longer the learning phase takes, but the more accurate the calculation result is.
  • the value of N can be adjusted according to the needs of actual calculation to control the calibration accuracy.
  • the clock synchronization frame described above may be a data frame of the 1588 clock synchronization protocol.
  • Step 302 The OLT periodically sends a clock synchronization packet to the ONU, where the packet carries two pieces of information, which are the time value and the synchronization time value of the MPCP, specifically three clock parameters: T_tq, T_sec and T_ns;
  • Step 303 After receiving the clock synchronization packet, the ONU parses the packet, extracts T_tq, T_sec, and T_ns from the packet, and configures the values of T_tq, T_sec, and T_ns to the local hardware.
  • the local hardware refers to the chip logic that implements local timer maintenance, periodically compensates the local timer according to the configuration, and generates a pulse signal at the on-time. This part is calculated every clock cycle and cannot be done in software.
  • Step 304 The time value timer of the ONU updates the local seconds timer and the nanosecond timer to T_sec and T_ns respectively when the timing reaches T_tq;
  • Step 305 The second timer and the nanosecond timer of the ONU are increased by 8 ns per clock cycle, and the nanosecond timer is periodically calibrated according to the fast and slow values calculated in step 301 and the offset value.
  • the nanosecond timer is decremented by 8 ns every offset clock cycle. If the current clock is slower than the standard clock, each offset value is clocked by the nanosecond timer. 8ns. If the offset value is 0, there is no need to calibrate the nanosecond timer.
  • Step 306 When the ONU's nanosecond timer counts to the whole second, a 1 pps pulse is issued.
  • test result using the standard 1588 clock synchronization protocol is far less accurate than the test result obtained by using the scheme of the embodiment of the present invention.
  • the embodiment of the present invention further provides an ONU.
  • the ONU includes: a calculation module 41, a clock configuration module 42, a calibration module 43, and a sending module 44, where
  • the calculating module 41 is configured to calculate in advance a fast value and an offset value of the current clock relative to the standard clock;
  • the clock configuration module 42 is configured to receive a clock synchronization protocol packet, and configure a clock parameter of the clock synchronization protocol packet to be local;
  • the calibration module 43 is configured to calculate the fast value and the offset value according to the calculation module 41. Quasi-local clock;
  • Transmit module 44 is configured to pulse based on the local clock.
  • the calculation module 41 includes an acquisition sub-module 411 and a calculation sub-module 412.
  • the acquisition sub-module 411 is configured to receive and receive N clock synchronization frames and parse and obtain clock parameters, where N is an integer not less than 2, and each The clock synchronization frame includes three clock parameters: a time value of a multipoint control protocol, a corresponding second synchronization time value, and a nanosecond synchronization time value;
  • the calculation sub-module 412 is configured to calculate a fast and slow value and an offset value of the current clock relative to the standard clock according to the clock parameters of the first clock synchronization frame and the last clock synchronization frame obtained by the acquisition sub-module.
  • the calculation sub-module 412 is specifically configured to: calculate a difference between three clock parameters between the last clock synchronization frame and the first clock synchronization frame; use the difference between the second synchronization time value and the nanosecond synchronization time The sum of the difference values of the values is divided by the difference of the time values to obtain the number of nanoseconds corresponding to the current clock; comparing the number of nanoseconds with the standard number of nanoseconds to obtain the fast and slow values of the current clock relative to the standard clock And offset values.
  • the specific calculation method refers to the above method embodiment, and will not be described again.
  • the calibration module 43 is configured to:
  • the fast and slow value indicates that the current clock is faster than the standard clock, the number of times of the local nanosecond timer is subtracted by one of the standard nanoseconds every the offset value clock cycle;
  • the fast and slow value indicates that the current clock is slower than the standard clock
  • the number of times of the local nanosecond timer is added to the standard number of nanoseconds every the offset value clock cycle.
  • the sending module 44 is configured to send a pulse every second time to the local nanosecond timer.
  • the clock configuration module 42 is configured to receive a clock synchronization protocol packet, where the clock synchronization protocol packet includes three clock parameters: a time value of the multipoint control protocol and a corresponding second synchronization time value, and a nanosecond. Synchronizing a time value; configuring the time value to a local time value timer and starting timing; when the time value timer counts to the time value, local seconds The timer and the nanosecond timer are updated to the second synchronization time value and the nanosecond synchronization time value, respectively.
  • the clock synchronization method and the ONU provided by the embodiment of the present invention can save the atomic clock device on the OLT side and reduce the system cost compared with the prior art (the method specified in the 1588 protocol), and can also greatly reduce the ONU sending clock synchronization protocol to the OLT.
  • the frequency of the frame and the CPU configuration requirements of the ONU can generally be met once in 10 seconds or more.
  • the calculation module, the clock configuration module, the calibration module, the transmission module and the like in the optical network unit provided by the embodiment of the present invention can all be implemented by a processor in the optical network unit; of course, it can also be implemented by a specific logic circuit;
  • the processor may be a central processing unit (CPU), a microprocessor (MPU), a digital signal processor (DSP), or a field programmable gate array (FPGA).
  • the clock synchronization method described above is implemented in the form of a software function module and sold or used as a stand-alone product, it may also be stored in a computer readable storage medium.
  • the technical solution of the embodiments of the present invention may be embodied in the form of a software product in essence or in the form of a software product stored in a storage medium, including a plurality of instructions.
  • a computer device (which may be a personal computer, server, or network device, etc.) is caused to perform all or part of the methods described in various embodiments of the present invention.
  • the foregoing storage medium includes various media that can store program codes, such as a USB flash drive, a mobile hard disk, a read only memory (ROM), a magnetic disk, or an optical disk.
  • program codes such as a USB flash drive, a mobile hard disk, a read only memory (ROM), a magnetic disk, or an optical disk.
  • the embodiment of the present invention further provides a computer storage medium, where the computer storage medium stores computer executable instructions for performing the clock synchronization method provided in the embodiments of the present invention.
  • the speed value and the offset value of the current clock relative to the standard clock are calculated in advance; the clock synchronization protocol packet is received, and the clock parameter of the clock synchronization protocol packet is configured locally; according to the fast and slow value
  • the offset value is used to calibrate the local clock; based on the local clock, a pulse is emitted, thus, the ONU high-precision clock synchronization is implemented in the case where the clock of the OLT comes from a non-precision atomic clock.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Synchronisation In Digital Transmission Systems (AREA)

Abstract

L'invention concerne un procédé de synchronisation d'horloge. Le procédé consiste : à calculer une valeur rapide/lente et une valeur de décalage d'une horloge courante par rapport à une horloge standard en avance; à recevoir un message de protocole de synchronisation d'horloge, et à configurer localement les paramètres d'horloge du message de protocole de synchronisation d'horloge; selon la valeur rapide/lente et la valeur de décalage, à étalonner une horloge locale; et sur la base de l'horloge locale, à envoyer une impulsion. En conséquence, l'invention concerne en outre une unité de réseau optique et un support d'informations.
PCT/CN2015/075516 2014-09-23 2015-03-31 Procédé de synchronisation d'horloge, unité de réseau optique et support d'informations WO2016045340A1 (fr)

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CN111211855A (zh) * 2020-01-03 2020-05-29 中国船舶重工集团公司第七0七研究所 一种分布式处理系统混合时钟同步方法
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CN108229747A (zh) * 2018-01-12 2018-06-29 中国计量科学研究院 校准控制方法、装置及时间信号产生系统
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CN114553353B (zh) * 2020-11-25 2023-09-19 成都鼎桥通信技术有限公司 校时方法、装置和车载无线通信盒子
CN112637031A (zh) * 2021-01-06 2021-04-09 广东博智林机器人有限公司 从站控制周期的校准方法、校准装置和驱动控制系统

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