WO2022049622A1 - Communication system - Google Patents

Communication system Download PDF

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Publication number
WO2022049622A1
WO2022049622A1 PCT/JP2020/033043 JP2020033043W WO2022049622A1 WO 2022049622 A1 WO2022049622 A1 WO 2022049622A1 JP 2020033043 W JP2020033043 W JP 2020033043W WO 2022049622 A1 WO2022049622 A1 WO 2022049622A1
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master
master device
unit
communication
slave device
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PCT/JP2020/033043
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French (fr)
Japanese (ja)
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浩文 山本
慶太 高橋
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日本電信電話株式会社
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Priority to JP2022546740A priority Critical patent/JP7468671B2/en
Priority to PCT/JP2020/033043 priority patent/WO2022049622A1/en
Publication of WO2022049622A1 publication Critical patent/WO2022049622A1/en

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    • G—PHYSICS
    • G04—HOROLOGY
    • G04G—ELECTRONIC TIME-PIECES
    • G04G5/00—Setting, i.e. correcting or changing, the time-indication
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L7/00—Arrangements for synchronising receiver with transmitter

Definitions

  • This disclosure relates to a communication system.
  • time synchronization is performed for the master device and the slave device, for example, for communication timing control and the like.
  • one master device that is the synchronization source is selected by BMCA (Best Master Clock Algorithm) described in Non-Patent Document 1.
  • BMCA Best Master Clock Algorithm
  • a master device and a slave device use a communication protocol including time synchronization information (S-Plane message).
  • S-Plane message time synchronization information
  • Those that transmit and receive a main signal (C / U-Plane message) and a device setting signal (M-Plane message) are known.
  • Non-Patent Document 2 In a communication system using a communication method as shown in Non-Patent Document 2, it is necessary to exchange synchronization information in order to establish communication between a master device and a slave device to transmit and receive a main signal. ..
  • the technique as shown in Non-Patent Document 1 is used to select one master device as a synchronization source. In this case, synchronization information is exchanged between the master device and the slave device selected as the synchronization source, and communication is established.
  • synchronization information is not exchanged between the master device and the slave device that are not selected as the synchronization source, communication cannot be established.
  • the purpose is to use one master as a time synchronization source for slave devices in a communication system in which each of two or more master devices sends and receives a main signal to one slave device using a communication protocol that includes synchronization information. It is an object of the present invention to provide a communication system capable of establishing communication between a master device and a slave device that have not been selected as a time synchronization source while selecting a device.
  • the communication system includes a master device group including two or more master devices, and one slave device connected to each of the master devices in the master device group, and the master device group is said to have the same slave device.
  • Each of the master devices and the slave device transmits and receives a main signal using a communication protocol including synchronization information, and the slave device selects one master device from the master device group as a synchronization source.
  • the master selection unit, the synchronization information communication unit that transmits and receives the synchronization information to and from the master device selected by the master selection unit as the synchronization source, and the master selection unit in the master device group did not select as the synchronization source.
  • a dummy signal communication unit for transmitting and receiving the synchronization information of the master device and the dummy is provided.
  • each of two or more master devices sends and receives a main signal to one slave device using a communication protocol including synchronization information
  • the time of the slave device While selecting one master device as the synchronization source, it has the effect of being able to establish communication between the master device and the slave device that were not selected as the time synchronization source.
  • FIG. 3 is a block diagram showing a configuration of a main part related to synchronization signal processing in a slave device of the communication system according to the first embodiment.
  • FIG. 1 is a block diagram showing an overall configuration of a communication system.
  • FIG. 2 is a block diagram showing a configuration of a main part related to synchronization signal processing in a slave device of a communication system.
  • the communication system includes a master device group 10 and one slave device 100.
  • the master device group 10 includes two or more master devices.
  • the master device group 10 includes N master devices.
  • N is an integer of 2 or more.
  • a serial number is assigned to each master device for convenience, and they are referred to as master device # 1, master device # 2, ..., Master device # N.
  • the master devices of the master device group 10 may be individual devices or integrated devices.
  • the slave device 100 is connected to each of the master devices of the master device group 10.
  • the master device of the master device group 10 is built in, for example, the master station device.
  • the slave device 100 is built in, for example, a slave station device.
  • the master station device is the CU (Central Unit) and / or the DU (Distributed Unit) of the base station. Further, in this case, the slave station device corresponds to RU (Radio Unit).
  • the slave device 100 transmits and receives a main signal on the same medium as each of the master devices of the master device group 10 using a communication protocol including synchronization information. That is, each of the master devices of the master device group 10 and the slave device 100 are connected by a communication method that requires synchronization information of time in addition to the main signal. Specific examples of such a communication method include eCPRI (Common Public Radio Interface (CPRI is a registered trademark)).
  • CPRI Common Public Radio Interface
  • ORAN-WG4 O-RAN Alliance Working Group 4
  • the setting information of the slave device 100 is acquired from the master device by the M-plane protocol.
  • the C-plane message corresponds to the control information of the main signal
  • the U-plane message corresponds to the user information of the main signal.
  • the time synchronization information is included in the S-plane message.
  • the slave device 100 has two or more slave functions 101.
  • the slave function 101 corresponds to each of the master devices of the master device group 10 with which the slave device 100 communicates.
  • the number of slave functions 101 is the same as that of the master device. That is, in the illustrated configuration example, the slave device 100 has N slave functions 101.
  • the plurality of slave functions 101 corresponding to the plurality of master devices share one slave device 100.
  • the slave device 100 includes an interface unit 111, a switch unit 112, an oscillator 121, a timer 122, a correction value calculation unit 123, a master selection unit 131, a synchronization information communication unit 132, and a dummy signal communication unit 140. ing.
  • the slave device 100 may be configured as hardware by a computer equipped with a processor and a memory.
  • the processor is also referred to as a CPU (Central Processing Unit), a central processing unit, a processing unit, an arithmetic unit, a microprocessor, a microcomputer, or a DSP.
  • Examples of the memory include non-volatile or volatile semiconductor memories such as RAM, ROM, flash memory, EPROM and EEPROM, or magnetic disks, flexible disks, optical disks, compact disks, mini disks and DVDs.
  • the program as software is stored in the memory of the slave device 100. Then, the slave device 100 executes a preset process by executing a program stored in the memory by the processor, and as a result of the cooperation between the hardware and the software, the switch unit 112, the timer 122, and the correction value
  • the functions of the calculation unit 123, the master selection unit 131, the synchronization information communication unit 132, the dummy signal communication unit 140, and the slave function 101 are realized.
  • the interface unit 111 is a communication interface for transmitting and receiving synchronization information and a main signal with each of the master devices of the master device group 10.
  • the interface unit 111 corresponds to each of the master devices of the master device group 10 with which the slave device 100 communicates.
  • the number of interface units 111 is the same as that of the master device. That is, the slave device 100 includes two or more interface units 111. In the illustrated configuration example, the slave device 100 has N interface units 111.
  • the switch unit 112 switches between two or more interface units 111. When the switch unit 112 switches the interface unit 111, the master device that communicates the synchronization information with the slave device 100 can be switched.
  • the oscillator 121 outputs a timing signal at which the timer 122 ticks the time.
  • the oscillator 121 has a crystal oscillator and outputs a periodic sine wave signal, a square wave signal, a pulse signal, or the like as a timing signal.
  • the timer 122 measures the time based on the timing signal output from the oscillator 121.
  • the timer 122 determines the time information used for various processes in the slave function 101 of the slave device 100.
  • the master selection unit 131 selects one master device from the master device group 10 as the synchronization source of the slave device 100.
  • the master device selected as the synchronization source will act as the so-called ground master or boundary clock.
  • the synchronization information communication unit 132 transmits / receives synchronization information to / from the master device selected by the master selection unit 131 as the synchronization source.
  • the switch unit 112 switches the interface unit 111 used for communication by the synchronization information communication unit 132 to one corresponding to the master device selected by the master selection unit 131 as the synchronization source.
  • the synchronization information communication unit 132 can transmit and receive synchronization information to and from the master device selected by the master selection unit 131 as the synchronization source.
  • the correction value calculation unit 123 calculates the difference between the synchronization information of the master device received by the synchronization information communication unit 132 and the time measured by the timer 122 as a correction value. Then, the timer 122 corrects the time measured by the correction value calculated by the correction value calculation unit 123. That is, the timer 122 determines the time information of the slave device 100 by using the synchronization information received by the synchronization information communication unit 132. In this way, time synchronization is performed between the master device and the slave device 100 selected as the synchronization source.
  • the switch unit 112 switches all the masters of the master device group 10 while switching the interface unit 111 used by the synchronization information communication unit 132 for communication. Get synchronization information from the device. Then, the master selection unit 131 determines the master device as the synchronization source based on the acquired synchronization information of all the master devices.
  • the correction value calculation unit 123 calculates the difference between the time measured by the timer 122 and the synchronization information acquired from all the master devices of the master device group 10. Then, the master selection unit 131 selects, for example, the master device of the synchronization information having the smallest difference as the synchronization source by using the calculation result of the correction value calculation unit 123.
  • the master selection unit 131 may use BMCA (Best Master Clock Algorithm) to determine a master device as a synchronization source.
  • the dummy signal communication unit 140 transmits / receives synchronization information of the dummy to and from the master device that the master selection unit 131 did not select as the synchronization source in the master device group 10. For example, when PTP is used for time synchronization, the dummy signal communication unit 140 generates a delay request message as dummy synchronization information.
  • the dummy signal communication unit 140 acquires the time information that is the basis for generating the dummy synchronization information from, for example, the timer 122.
  • the dummy signal communication unit 140 may generate the time information that is the basis for generating the dummy synchronization information separately from the timer 122. That is, the dummy signal communication unit 140 may be provided with a time measuring means independent of the timer 122.
  • the switch unit 112 switches the interface unit 111 used for communication by the dummy signal communication unit 140 to one corresponding to each of the master devices not selected as the synchronization source by the master selection unit 131. By doing so, the dummy signal communication unit 140 can transmit and receive dummy synchronization information to and from each of the master devices that the master selection unit 131 has not selected as the synchronization source.
  • the master device that has received the dummy synchronization information generated by the dummy signal communication unit 140 can recognize that the slave device 100 is under its own control. Then, since synchronization information is exchanged with the master device not selected as the synchronization source of the slave device 100, communication can be established between the master device not selected as the synchronization source and the slave device 100. Therefore, in a communication system in which two or more master devices each transmit and receive a main signal to one slave device 100 using a communication protocol including synchronization information, one master as a time synchronization source of the slave device 100. While selecting the device, establish communication between the master device and the slave device 100 that were not selected as the time synchronization source, and the main signal also between the master device and the slave device 100 that were not selected as the time synchronization source. Can be sent and received.
  • the present disclosure comprises a master device group including two or more master devices and one slave device connected to each of the master devices of the master device group, and each master device and the slave device are time-synchronized. It can be used for communication systems that send and receive main signals using communication protocols that include information.

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

Abstract

Provided is a communication system capable of establishing communication between a slave device and a master device not selected as a time synchronization source while selecting one master device as the time synchronization source of the slave device. Accordingly, the slave device (100) of the communication system according to the present disclosure comprises: a master selection unit (131) that selects, as a synchronization source, one master device from a master device group (10); a synchronization information communication unit (132) that transmits and receives synchronization information to and from the master device selected as the synchronization source by the master selection unit (131); and a dummy signal communication unit (140) that transmits and receives dummy synchronization information to and from the master device, from among the master device group (10), that was not selected as the synchronization source by the master selection unit.

Description

通信システムCommunications system
　本開示は、通信システムに関するものである。 This disclosure relates to a communication system.
　マスター装置とスレーブ装置とを有する通信システムにおいては、例えば通信タイミング制御等のためにマスター装置とスレーブ装置について時刻同期を行う。この際、時刻の同期源として選択可能なマスター装置が２つ以上存在する場合、例えば、非特許文献１に記載されるＢＭＣＡ（Ｂｅｓｔ　Ｍａｓｔｅｒ　Ｃｌｏｃｋ　Ａｌｇｏｒｉｔｈｍ）等により同期源となるマスター装置を１つ選択する。このような通信システムにおける通信方式としては、例えば、非特許文献２に例示されるように、マスター装置とスレーブ装置とが、時刻の同期情報（Ｓ－Ｐｌａｎｅメッセージ）が含まれる通信プロトコルを用いて主信号（Ｃ／Ｕ－Ｐｌａｎｅメッセージ）及び装置設定信号（Ｍ－Ｐｌａｎｅメッセージ）を送受信するものが知られている。 In a communication system having a master device and a slave device, time synchronization is performed for the master device and the slave device, for example, for communication timing control and the like. At this time, when there are two or more master devices that can be selected as the time synchronization source, for example, one master device that is the synchronization source is selected by BMCA (Best Master Clock Algorithm) described in Non-Patent Document 1. do. As a communication method in such a communication system, for example, as illustrated in Non-Patent Document 2, a master device and a slave device use a communication protocol including time synchronization information (S-Plane message). Those that transmit and receive a main signal (C / U-Plane message) and a device setting signal (M-Plane message) are known.
　非特許文献２に示されるような通信方式を用いた通信システムにおいては、マスター装置とスレーブ装置との間で通信を確立して主信号を送受信するためには、同期情報のやり取りが必要である。１つのスレーブ装置に対して２つ以上のマスター装置が接続されている場合、非特許文献１に示されるような技術を用いると、同期源となる１つのマスター装置を選択することになる。この場合、同期源として選択されたマスター装置とスレーブ装置との間では同期情報がやり取りされて通信が確立される。一方、同期源として選択されなかったマスター装置とスレーブ装置との間では同期情報がやり取りされないため通信が確立できない。 In a communication system using a communication method as shown in Non-Patent Document 2, it is necessary to exchange synchronization information in order to establish communication between a master device and a slave device to transmit and receive a main signal. .. When two or more master devices are connected to one slave device, the technique as shown in Non-Patent Document 1 is used to select one master device as a synchronization source. In this case, synchronization information is exchanged between the master device and the slave device selected as the synchronization source, and communication is established. On the other hand, since synchronization information is not exchanged between the master device and the slave device that are not selected as the synchronization source, communication cannot be established.
　本開示は、このような課題を解決するためになされたものである。その目的は、同期情報が含まれる通信プロトコルを用いて、１つのスレーブ装置に対して２つ以上のマスター装置のそれぞれが主信号を送受信する通信システムにおいて、スレーブ装置の時刻同期源として１つのマスター装置を選択しつつ、時刻同期源に選択されなかったマスター装置とスレーブ装置との間での通信を確立可能である通信システムを提供することにある。 This disclosure is made to solve such problems. The purpose is to use one master as a time synchronization source for slave devices in a communication system in which each of two or more master devices sends and receives a main signal to one slave device using a communication protocol that includes synchronization information. It is an object of the present invention to provide a communication system capable of establishing communication between a master device and a slave device that have not been selected as a time synchronization source while selecting a device.
　本開示に係る通信システムは、２つ以上のマスター装置を含むマスター装置群と、前記マスター装置群の前記マスター装置のそれぞれと接続された１つのスレーブ装置と、を備え、前記マスター装置群の前記マスター装置のそれぞれと前記スレーブ装置とは、同期情報が含まれる通信プロトコルを用いて主信号を送受信し、前記スレーブ装置は、前記マスター装置群のうちから１つの前記マスター装置を同期源として選択するマスター選択部と、前記マスター選択部が同期源として選択した前記マスター装置と前記同期情報を送受信する同期情報通信部と、前記マスター装置群のうちで前記マスター選択部が同期源として選択しなかった前記マスター装置とダミーの前記同期情報を送受信するダミー信号通信部と、を備える。 The communication system according to the present disclosure includes a master device group including two or more master devices, and one slave device connected to each of the master devices in the master device group, and the master device group is said to have the same slave device. Each of the master devices and the slave device transmits and receives a main signal using a communication protocol including synchronization information, and the slave device selects one master device from the master device group as a synchronization source. The master selection unit, the synchronization information communication unit that transmits and receives the synchronization information to and from the master device selected by the master selection unit as the synchronization source, and the master selection unit in the master device group did not select as the synchronization source. A dummy signal communication unit for transmitting and receiving the synchronization information of the master device and the dummy is provided.
　本開示に係る通信システムによれば、同期情報が含まれる通信プロトコルを用いて、１つのスレーブ装置に対して２つ以上のマスター装置のそれぞれが主信号を送受信する通信システムにおいて、スレーブ装置の時刻同期源として１つのマスター装置を選択しつつ、時刻同期源に選択されなかったマスター装置とスレーブ装置との間での通信を確立可能であるという効果を奏する。 According to the communication system according to the present disclosure, in a communication system in which each of two or more master devices sends and receives a main signal to one slave device using a communication protocol including synchronization information, the time of the slave device. While selecting one master device as the synchronization source, it has the effect of being able to establish communication between the master device and the slave device that were not selected as the time synchronization source.
実施の形態１に係る通信システムの全体構成を示すブロック図である。It is a block diagram which shows the whole structure of the communication system which concerns on Embodiment 1. FIG. 実施の形態１に係る通信システムのスレーブ装置における特に同期信号処理に関係する要部の構成を示すブロック図である。FIG. 3 is a block diagram showing a configuration of a main part related to synchronization signal processing in a slave device of the communication system according to the first embodiment.
　本開示に係る通信システムを実施するための形態について添付の図面を参照しながら説明する。各図において、同一又は相当する部分には同一の符号を付して、重複する説明は適宜に簡略化又は省略する。以下の説明においては便宜上、図示の状態を基準に各構造の位置関係を表現することがある。なお、本開示は以下の実施の形態に限定されることなく、本開示の趣旨を逸脱しない範囲において、各実施の形態の自由な組み合わせ、各実施の形態の任意の構成要素の変形、又は各実施の形態の任意の構成要素の省略が可能である。 The mode for implementing the communication system according to the present disclosure will be described with reference to the attached drawings. In each figure, the same or corresponding parts are designated by the same reference numerals, and duplicate description will be appropriately simplified or omitted. In the following description, for convenience, the positional relationship of each structure may be expressed with reference to the illustrated state. It should be noted that the present disclosure is not limited to the following embodiments, and is free combination of each embodiment, modification of any component of each embodiment, or each of them, as long as the purpose of the present disclosure is not deviated. It is possible to omit any component of the embodiment.
実施の形態１．
　図１及び図２を参照しながら、本開示の実施の形態１について説明する。図１は通信システムの全体構成を示すブロック図である。図２は通信システムのスレーブ装置における特に同期信号処理に関係する要部の構成を示すブロック図である。 Embodiment 1.
The first embodiment of the present disclosure will be described with reference to FIGS. 1 and 2. FIG. 1 is a block diagram showing an overall configuration of a communication system. FIG. 2 is a block diagram showing a configuration of a main part related to synchronization signal processing in a slave device of a communication system.
　この実施の形態に係る通信システムは、図１に示すように、マスター装置群１０と、１つのスレーブ装置１００とを備えている。マスター装置群１０は、２つ以上のマスター装置を含んでいる。図示の例では、マスター装置群１０はＮ台のマスター装置を含んでいる。Ｎは２以上の整数である。それぞれのマスター装置を区別するため、便宜的にそれぞれのマスター装置に通し番号を振り、マスター装置＃１、マスター装置＃２、・・・、マスター装置＃Ｎと表記する。なお、マスター装置群１０のマスター装置は、それぞれが個別の装置であっても、一体化された装置であってもよい。 As shown in FIG. 1, the communication system according to this embodiment includes a master device group 10 and one slave device 100. The master device group 10 includes two or more master devices. In the illustrated example, the master device group 10 includes N master devices. N is an integer of 2 or more. In order to distinguish each master device, a serial number is assigned to each master device for convenience, and they are referred to as master device # 1, master device # 2, ..., Master device # N. The master devices of the master device group 10 may be individual devices or integrated devices.
　スレーブ装置１００は、マスター装置群１０のマスター装置のそれぞれと接続されている。マスター装置群１０のマスター装置は、例えば、親局装置に内蔵されている。スレーブ装置１００は、例えば、子局装置に内蔵されている。通信システムが、Ｏ－ＲＡＮ（Ｏｐｅｎ　Ｒａｄｉｏ　Ａｃｃｅｓｓ　Ｎｅｔｗｏｒｋ）のモバイルフロントホールに適用されている場合、親局装置は基地局のＣＵ（Ｃｅｎｔｒａｌ　Ｕｎｉｔ）及び／又はＤＵ（Ｄｉｓｔｒｉｂｕｔｅｄ　Ｕｎｉｔ）である。また、この場合、子局装置はＲＵ（Ｒａｄｉｏ　Ｕｎｉｔ）にあたる。 The slave device 100 is connected to each of the master devices of the master device group 10. The master device of the master device group 10 is built in, for example, the master station device. The slave device 100 is built in, for example, a slave station device. When the communication system is applied to the mobile front hall of the O-RAN (Open Radio Access Network), the master station device is the CU (Central Unit) and / or the DU (Distributed Unit) of the base station. Further, in this case, the slave station device corresponds to RU (Radio Unit).
　スレーブ装置１００は、マスター装置群１０のマスター装置のそれぞれと、同期情報が含まれる通信プロトコルを用いて主信号を同一媒体で送受信する。すなわち、マスター装置群１０のマスター装置のそれぞれと、スレーブ装置１００とは、主信号に加えて、時刻の同期情報も必要な通信方式で接続されている。このような通信方式として、具体的に例えば、ｅＣＰＲＩ（Ｃｏｍｍｏｎ　Ｐｕｂｌｉｃ　Ｒａｄｉｏ　Ｉｎｔｅｒｆａｃｅ（ＣＰＲＩは登録商標））を挙げることができる。 The slave device 100 transmits and receives a main signal on the same medium as each of the master devices of the master device group 10 using a communication protocol including synchronization information. That is, each of the master devices of the master device group 10 and the slave device 100 are connected by a communication method that requires synchronization information of time in addition to the main signal. Specific examples of such a communication method include eCPRI (Common Public Radio Interface (CPRI is a registered trademark)).
　例えば、マスター装置群１０とスレーブ装置１００との間の通信に、ＯＲＡＮ－ＷＧ４（Ｏ－ＲＡＮ　Ａｌｌｉａｎｃｅ　Ｗｏｒｋｉｎｇ　Ｇｒｏｕｐ　４）で規定されているインターフェースを使用しているとする。この場合、スレーブ装置１００の設定情報はＭ－ｐｌａｎｅプロトコルによりマスター装置から取得する。また、Ｃ－ｐｌａｎｅメッセージは主信号の制御情報に相当し、Ｕ－ｐｌａｎｅメッセージは主信号のユーザ情報に相当する。そして、時刻の同期情報は、Ｓ－ｐｌａｎｅメッセージに含まれている。 For example, it is assumed that the interface specified by ORAN-WG4 (O-RAN Alliance Working Group 4) is used for communication between the master device group 10 and the slave device 100. In this case, the setting information of the slave device 100 is acquired from the master device by the M-plane protocol. Further, the C-plane message corresponds to the control information of the main signal, and the U-plane message corresponds to the user information of the main signal. The time synchronization information is included in the S-plane message.
　スレーブ装置１００は、２つ以上のスレーブ機能１０１を有している。スレーブ機能１０１は、当該スレーブ装置１００が通信するマスター装置群１０のマスター装置のそれぞれに対応している。スレーブ機能１０１は、マスター装置と同数だけ設けられている。すなわち、図示の構成例では、スレーブ装置１００にスレーブ機能１０１がＮ個ある。このように、この実施の形態の通信システムでは、複数のマスター装置に対応する複数のスレーブ機能１０１が、１つのスレーブ装置１００を共用している。 The slave device 100 has two or more slave functions 101. The slave function 101 corresponds to each of the master devices of the master device group 10 with which the slave device 100 communicates. The number of slave functions 101 is the same as that of the master device. That is, in the illustrated configuration example, the slave device 100 has N slave functions 101. As described above, in the communication system of this embodiment, the plurality of slave functions 101 corresponding to the plurality of master devices share one slave device 100.
　次に、図２を参照しながら、複数のスレーブ機能１０１が共用するスレーブ装置１００の構成について説明する。同図に示すように、スレーブ装置１００は、インターフェース部１１１、スイッチ部１１２、発振器１２１、タイマー１２２、補正値計算部１２３、マスター選択部１３１、同期情報通信部１３２及びダミー信号通信部１４０を備えている。 Next, the configuration of the slave device 100 shared by the plurality of slave functions 101 will be described with reference to FIG. 2. As shown in the figure, the slave device 100 includes an interface unit 111, a switch unit 112, an oscillator 121, a timer 122, a correction value calculation unit 123, a master selection unit 131, a synchronization information communication unit 132, and a dummy signal communication unit 140. ing.
　スレーブ装置１００は、ハードウェアとして、プロセッサ及びメモリを備えたコンピュータにより構成してもよい。プロセッサは、ＣＰＵ（Ｃｅｎｔｒａｌ　Ｐｒｏｃｅｓｓｉｎｇ　Ｕｎｉｔ）、中央処理装置、処理装置、演算装置、マイクロプロセッサ、マイクロコンピュータあるいはＤＳＰともいう。メモリには、例えば、ＲＡＭ、ＲＯＭ、フラッシュメモリー、ＥＰＲＯＭ及びＥＥＰＲＯＭ等の不揮発性または揮発性の半導体メモリ、又は、磁気ディスク、フレキシブルディスク、光ディスク、コンパクトディスク、ミニディスク及びＤＶＤ等が該当する。 The slave device 100 may be configured as hardware by a computer equipped with a processor and a memory. The processor is also referred to as a CPU (Central Processing Unit), a central processing unit, a processing unit, an arithmetic unit, a microprocessor, a microcomputer, or a DSP. Examples of the memory include non-volatile or volatile semiconductor memories such as RAM, ROM, flash memory, EPROM and EEPROM, or magnetic disks, flexible disks, optical disks, compact disks, mini disks and DVDs.
　スレーブ装置１００のメモリには、ソフトウェアとしてのプログラムが記憶される。そして、スレーブ装置１００は、メモリに記憶されたプログラムをプロセッサが実行することによって予め設定された処理を実施し、ハードウェアとソフトウェアとが協働した結果として、スイッチ部１１２、タイマー１２２、補正値計算部１２３、マスター選択部１３１、同期情報通信部１３２及びダミー信号通信部１４０の各部の機能、並びに、スレーブ機能１０１を実現する。 The program as software is stored in the memory of the slave device 100. Then, the slave device 100 executes a preset process by executing a program stored in the memory by the processor, and as a result of the cooperation between the hardware and the software, the switch unit 112, the timer 122, and the correction value The functions of the calculation unit 123, the master selection unit 131, the synchronization information communication unit 132, the dummy signal communication unit 140, and the slave function 101 are realized.
　インターフェース部１１１は、マスター装置群１０のマスター装置それぞれと同期情報及び主信号を送受信するための通信インターフェースである。インターフェース部１１１は、当該スレーブ装置１００が通信するマスター装置群１０のマスター装置のそれぞれに対応している。インターフェース部１１１は、マスター装置と同数だけ設けられている。すなわち、スレーブ装置１００は、２以上のインターフェース部１１１を備えている。なお、図示の構成例では、スレーブ装置１００にインターフェース部１１１がＮ個ある。スイッチ部１１２は、２以上のインターフェース部１１１を切り替える。スイッチ部１１２がインターフェース部１１１を切り替えることで、スレーブ装置１００と同期情報を通信するマスター装置が切り替えられる。 The interface unit 111 is a communication interface for transmitting and receiving synchronization information and a main signal with each of the master devices of the master device group 10. The interface unit 111 corresponds to each of the master devices of the master device group 10 with which the slave device 100 communicates. The number of interface units 111 is the same as that of the master device. That is, the slave device 100 includes two or more interface units 111. In the illustrated configuration example, the slave device 100 has N interface units 111. The switch unit 112 switches between two or more interface units 111. When the switch unit 112 switches the interface unit 111, the master device that communicates the synchronization information with the slave device 100 can be switched.
　発振器１２１は、タイマー１２２が時刻を刻むタイミング信号を出力する。例えば、発振器１２１は、水晶振動子を有しており、タイミング信号として周期的な正弦波信号、矩形波信号又はパルス信号等を出力する。タイマー１２２は、発振器１２１から出力されたタイミング信号に基づいて、時刻を計時する。タイマー１２２により、スレーブ装置１００のスレーブ機能１０１における各種処理に用いられる時刻情報が確定される。 The oscillator 121 outputs a timing signal at which the timer 122 ticks the time. For example, the oscillator 121 has a crystal oscillator and outputs a periodic sine wave signal, a square wave signal, a pulse signal, or the like as a timing signal. The timer 122 measures the time based on the timing signal output from the oscillator 121. The timer 122 determines the time information used for various processes in the slave function 101 of the slave device 100.
　マスター選択部１３１は、マスター装置群１０のうちから１つのマスター装置をスレーブ装置１００の同期源として選択する。同期源として選択されたマスター装置は、いわゆるグランドマスターあるいはバウンダリクロックとして働くことになる。 The master selection unit 131 selects one master device from the master device group 10 as the synchronization source of the slave device 100. The master device selected as the synchronization source will act as the so-called ground master or boundary clock.
　同期情報通信部１３２は、マスター選択部１３１が同期源として選択したマスター装置と同期情報を送受信する。この際、スイッチ部１１２は、同期情報通信部１３２が通信に使用するインターフェース部１１１を、マスター選択部１３１が同期源として選択したマスター装置に対応したものに切り替える。このようにすることで、同期情報通信部１３２は、マスター選択部１３１が同期源として選択したマスター装置と同期情報を送受信することが可能となる。 The synchronization information communication unit 132 transmits / receives synchronization information to / from the master device selected by the master selection unit 131 as the synchronization source. At this time, the switch unit 112 switches the interface unit 111 used for communication by the synchronization information communication unit 132 to one corresponding to the master device selected by the master selection unit 131 as the synchronization source. By doing so, the synchronization information communication unit 132 can transmit and receive synchronization information to and from the master device selected by the master selection unit 131 as the synchronization source.
　補正値計算部１２３は、同期情報通信部１３２が受信したマスター装置の同期情報と、タイマー１２２が計時する時刻との差分を補正値として算出する。そして、タイマー１２２は、補正値計算部１２３が算出した補正値により計時する時刻を補正する。すなわち、タイマー１２２は、同期情報通信部１３２が受信した同期情報を用いてスレーブ装置１００の時刻情報を確定する。このようにして、同期源として選択されたマスター装置とスレーブ装置１００との間での時刻同期が行われる。 The correction value calculation unit 123 calculates the difference between the synchronization information of the master device received by the synchronization information communication unit 132 and the time measured by the timer 122 as a correction value. Then, the timer 122 corrects the time measured by the correction value calculated by the correction value calculation unit 123. That is, the timer 122 determines the time information of the slave device 100 by using the synchronization information received by the synchronization information communication unit 132. In this way, time synchronization is performed between the master device and the slave device 100 selected as the synchronization source.
　なお、マスター選択部１３１が同期源のマスター装置を選択する際には、まず、スイッチ部１１２により同期情報通信部１３２が通信に使用するインターフェース部１１１を切り替えながら、マスター装置群１０の全てのマスター装置から同期情報を取得する。そして、マスター選択部１３１は、取得した全てのマスター装置の同期情報に基づいて、同期源とするマスター装置を決定する。 When the master selection unit 131 selects the master device of the synchronization source, first, the switch unit 112 switches all the masters of the master device group 10 while switching the interface unit 111 used by the synchronization information communication unit 132 for communication. Get synchronization information from the device. Then, the master selection unit 131 determines the master device as the synchronization source based on the acquired synchronization information of all the master devices.
　この際、例えば、補正値計算部１２３は、マスター装置群１０の全てのマスター装置から取得した同期情報のそれぞれについて、タイマー１２２が計時する時刻との差分を算出する。そして、マスター選択部１３１は、補正値計算部１２３の算出結果を用いて、例えば、差分が最小の同期情報のマスター装置を同期源として選択する。あるいは、時刻同期にＰＴＰ（Ｐｒｅｃｉｓｉｏｎ　Ｔｉｍｅ　Ｐｒｏｔｏｃｏｌ）を用いている場合、マスター選択部１３１は、ＢＭＣＡ（Ｂｅｓｔ　Ｍａｓｔｅｒ　Ｃｌｏｃｋ　Ａｌｇｏｒｉｔｈｍ）を使用して同期源となるマスター装置を決定してもよい。 At this time, for example, the correction value calculation unit 123 calculates the difference between the time measured by the timer 122 and the synchronization information acquired from all the master devices of the master device group 10. Then, the master selection unit 131 selects, for example, the master device of the synchronization information having the smallest difference as the synchronization source by using the calculation result of the correction value calculation unit 123. Alternatively, when PTP (Precision Time Protocol) is used for time synchronization, the master selection unit 131 may use BMCA (Best Master Clock Algorithm) to determine a master device as a synchronization source.
　ダミー信号通信部１４０は、マスター装置群１０のうちでマスター選択部１３１が同期源として選択しなかったマスター装置とダミーの同期情報を送受信する。例えば、時刻同期にＰＴＰを用いている場合、ダミー信号通信部１４０は、ダミーの同期情報としてｄｅｌａｙ　ｒｅｑｕｅｓｔ　ｍｅｓｓａｇｅを生成する。ダミー信号通信部１４０は、ダミーの同期情報を生成する際の元になる時刻情報を、例えばタイマー１２２から取得する。あるいは、ダミーの同期情報を生成する際の元になる時刻情報の生成を、タイマー１２２とは別にダミー信号通信部１４０が行ってもよい。すなわち、ダミー信号通信部１４０は、タイマー１２２とは独立した計時手段を備えていてもよい。 The dummy signal communication unit 140 transmits / receives synchronization information of the dummy to and from the master device that the master selection unit 131 did not select as the synchronization source in the master device group 10. For example, when PTP is used for time synchronization, the dummy signal communication unit 140 generates a delay request message as dummy synchronization information. The dummy signal communication unit 140 acquires the time information that is the basis for generating the dummy synchronization information from, for example, the timer 122. Alternatively, the dummy signal communication unit 140 may generate the time information that is the basis for generating the dummy synchronization information separately from the timer 122. That is, the dummy signal communication unit 140 may be provided with a time measuring means independent of the timer 122.
　スイッチ部１１２は、ダミー信号通信部１４０が通信に使用するインターフェース部１１１を、マスター選択部１３１が同期源として選択しなかったマスター装置のそれぞれに対応したものに切り替える。このようにすることで、ダミー信号通信部１４０は、マスター選択部１３１が同期源として選択しなかったマスター装置のそれぞれとダミーの同期情報を送受信することが可能となる。 The switch unit 112 switches the interface unit 111 used for communication by the dummy signal communication unit 140 to one corresponding to each of the master devices not selected as the synchronization source by the master selection unit 131. By doing so, the dummy signal communication unit 140 can transmit and receive dummy synchronization information to and from each of the master devices that the master selection unit 131 has not selected as the synchronization source.
　ダミー信号通信部１４０が生成したダミーの同期情報を受信したマスター装置は、自身の配下にスレーブ装置１００があることを認識できる。そして、スレーブ装置１００の同期源として選択されなかったマスター装置との間で同期情報のやり取りが生じるため、同期源として選択されなかったマスター装置とスレーブ装置１００との間でも通信を確立できる。したがって、同期情報が含まれる通信プロトコルを用いて、１つのスレーブ装置１００に対して２つ以上のマスター装置のそれぞれが主信号を送受信する通信システムにおいて、スレーブ装置１００の時刻同期源として１つのマスター装置を選択しつつ、時刻同期源に選択されなかったマスター装置とスレーブ装置１００との間での通信を確立し、時刻同期源に選択されなかったマスター装置とスレーブ装置１００との間でも主信号を送受信することができる。 The master device that has received the dummy synchronization information generated by the dummy signal communication unit 140 can recognize that the slave device 100 is under its own control. Then, since synchronization information is exchanged with the master device not selected as the synchronization source of the slave device 100, communication can be established between the master device not selected as the synchronization source and the slave device 100. Therefore, in a communication system in which two or more master devices each transmit and receive a main signal to one slave device 100 using a communication protocol including synchronization information, one master as a time synchronization source of the slave device 100. While selecting the device, establish communication between the master device and the slave device 100 that were not selected as the time synchronization source, and the main signal also between the master device and the slave device 100 that were not selected as the time synchronization source. Can be sent and received.
　本開示は、２つ以上のマスター装置を含むマスター装置群と、マスター装置群のマスター装置のそれぞれと接続された１つのスレーブ装置とを備え、それぞれのマスター装置とスレーブ装置とは、時刻の同期情報が含まれる通信プロトコルを用いて主信号を送受信する通信システムに利用できる。 The present disclosure comprises a master device group including two or more master devices and one slave device connected to each of the master devices of the master device group, and each master device and the slave device are time-synchronized. It can be used for communication systems that send and receive main signals using communication protocols that include information.
　１０　　マスター装置群
１００　　スレーブ装置
１０１　　スレーブ機能
１１１　　インターフェース部
１１２　　スイッチ部
１２１　　発振器
１２２　　タイマー
１２３　　補正値計算部
１３１　　マスター選択部
１３２　　同期情報通信部
１４０　　ダミー信号通信部 10 Master device group 100 Slave device 101 Slave function 111 Interface section 112 Switch section 121 Oscillator 122 Timer 123 Correction value calculation section 131 Master selection section 132 Synchronous information communication section 140 Dummy signal communication section

Claims (3)

  1. 　２つ以上のマスター装置を含むマスター装置群と、
    　前記マスター装置群の前記マスター装置のそれぞれと接続された１つのスレーブ装置と、を備え、
    　前記マスター装置群の前記マスター装置のそれぞれと前記スレーブ装置とは、同期情報が含まれる通信プロトコルを用いて主信号を送受信し、
    　前記スレーブ装置は、
    　前記マスター装置群のうちから１つの前記マスター装置を同期源として選択するマスター選択部と、
    　前記マスター選択部が同期源として選択した前記マスター装置と前記同期情報を送受信する同期情報通信部と、
    　前記マスター装置群のうちで前記マスター選択部が同期源として選択しなかった前記マスター装置とダミーの前記同期情報を送受信するダミー信号通信部と、を備えた通信システム。     A master device group containing two or more master devices,
    A slave device, which is connected to each of the master devices of the master device group, is provided.
    Each of the master devices in the master device group and the slave device transmit and receive a main signal using a communication protocol including synchronization information.
    The slave device is
    A master selection unit that selects one of the master devices as a synchronization source from the master device group,
    A synchronization information communication unit that transmits and receives the synchronization information to and from the master device selected by the master selection unit as a synchronization source.
    A communication system including the master device that the master selection unit did not select as a synchronization source in the master device group, and a dummy signal communication unit that transmits and receives the dummy synchronization information.
  2. 　前記スレーブ装置は、
    　前記マスター装置群の前記マスター装置のそれぞれと通信するための２以上のインターフェース部と、
    　前記同期情報通信部及び前記ダミー信号通信部が通信に使用する前記インターフェース部を切り替えるスイッチ部と、をさらに備えた請求項１に記載の通信システム。     The slave device is
    Two or more interface units for communicating with each of the master devices of the master device group, and
    The communication system according to claim 1, further comprising a switch unit for switching the interface unit used by the synchronous information communication unit and the dummy signal communication unit for communication.
  3. 　前記スレーブ装置は、前記同期情報通信部が受信した前記同期情報を用いて前記スレーブ装置の時刻情報を確定するタイマーをさらに備え、
    　前記ダミー信号通信部は、前記タイマーとは独立して計時する手段を用いてダミーの前記時刻情報を生成する請求項１又は請求項２に記載の通信システム。     The slave device further includes a timer for determining the time information of the slave device using the synchronization information received by the synchronization information communication unit.
    The communication system according to claim 1 or 2, wherein the dummy signal communication unit generates the dummy time information by using a means for measuring independently of the timer.
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WO2013190602A1 (en) * 2012-06-19 2013-12-27 日本電気株式会社 Clock synchronization system, clock synchronization method, and storage medium whereupon clock synchronization program is stored
JP2016139846A (en) * 2015-01-26 2016-08-04 富士通株式会社 Time synchronization system, master unit and slave unit, and time synchronization method
JP2016152489A (en) * 2015-02-17 2016-08-22 日本電信電話株式会社 Time synchronization method and time synchronization device
JP2016225677A (en) * 2015-05-27 2016-12-28 株式会社日立製作所 Communication device to perform time synchronization

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