WO2022151993A1 - 检测时间同步性能的方法、装置及系统 - Google Patents

检测时间同步性能的方法、装置及系统 Download PDF

Info

Publication number
WO2022151993A1
WO2022151993A1 PCT/CN2021/143446 CN2021143446W WO2022151993A1 WO 2022151993 A1 WO2022151993 A1 WO 2022151993A1 CN 2021143446 W CN2021143446 W CN 2021143446W WO 2022151993 A1 WO2022151993 A1 WO 2022151993A1
Authority
WO
WIPO (PCT)
Prior art keywords
time synchronization
time
packet
target network
moment
Prior art date
Application number
PCT/CN2021/143446
Other languages
English (en)
French (fr)
Inventor
曹德众
Original Assignee
华为技术有限公司
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 华为技术有限公司 filed Critical 华为技术有限公司
Publication of WO2022151993A1 publication Critical patent/WO2022151993A1/zh

Links

Images

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L43/00—Arrangements for monitoring or testing data switching networks
    • H04L43/08—Monitoring or testing based on specific metrics, e.g. QoS, energy consumption or environmental parameters
    • 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
    • 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

Definitions

  • the present application relates to the field of communications, and in particular, to a method, device and system for detecting time synchronization performance.
  • Time synchronization also called time tracking or clock synchronization
  • time tracking technology refers to a technology in which the time of at least two devices in a communication system is kept synchronized. After the at least two devices complete the time synchronization, it may be detected whether the time synchronization performance of the at least two devices is abnormal, so as to determine the overall time synchronization effect of the at least two devices.
  • the time synchronization performance of the devices in the network can be measured one by one through a Global Positioning System (GPS) instrument.
  • the measurement process of each device may include: the GPS instrument realizes time synchronization with the satellite through the GPS component, so that the time of the GPS instrument is the satellite time. Then the GPS meter establishes a connection with the device through the measurement port. Get the time of the device over the established connection. Make the difference between the device's time and the GPS meter's satellite time. If the absolute value of the difference is greater than the preset preset threshold, it is determined that the time synchronization performance of the device is abnormal. If the time synchronization performance of any device in the network is abnormal, it is determined that the time synchronization performance of the network is abnormal.
  • the foregoing method for detecting time synchronization performance needs to detect devices in the network one by one to determine whether the time synchronization performance of the network is abnormal, resulting in low detection efficiency of the time synchronization performance of the network.
  • Embodiments of the present application provide a method, device, and system for detecting time synchronization performance, so as to improve the detection efficiency of time synchronization performance.
  • the present application provides a method for detecting time synchronization performance.
  • the method includes obtaining a time difference between the first device and the second device.
  • the first device is in a state of completing time synchronization with the clock source device.
  • the second device is in a state of completing time synchronization with the clock source device, and there is no time synchronization relationship between the first device and the second device.
  • the absolute value of the time difference is greater than the preset threshold, it is determined that the time synchronization performance of the target network is abnormal.
  • the target network is the network to which the first device and the second device belong.
  • the devices in the target network complete time synchronization based on a time synchronization protocol. For example 1588 protocol, NTP, RTP or other time synchronization protocols.
  • the target network is determined based on the time difference between the first device and the second device. Whether the time synchronization performance is abnormal, so as to quickly determine whether the time synchronization performance of the target network is abnormal. And the method for detecting the time synchronization performance does not need to use an additional GPS instrument to detect the devices in the network one by one, which effectively improves the detection efficiency of the time synchronization performance of the target network.
  • the way of determining that there is no time synchronization relationship with the second device may include the following two ways: In the first way, if the time synchronization priority of the first device is the same as the time synchronization priority of the second device, and both are the first priority, it is determined that there is no time synchronization relationship between the first device and the second device. In the second manner, if the first device and the second device are a preset pair of devices that do not need time synchronization, it is determined that there is no time synchronization relationship between the first device and the second device.
  • the manner of acquiring the time difference between the first device and the second device may include the following two optional implementation manners:
  • the time difference is determined based on the packets transmitted between the first device and the second device.
  • the first device and the second device respectively send a packet to the opposite end.
  • the time difference is determined by obtaining the sending and receiving times of the two packets.
  • the time difference can be calculated by the first device, or calculated by the second device and notified of the calculation result to the first device, and can also be calculated by the third device and notified of the calculation result to the first device.
  • the third device may be a management device.
  • the time difference is obtained by transmitting packets between the first device and the second device, and the time difference can be quickly obtained without manual participation. Further, real-time detection of time synchronization performance is realized, and detection efficiency is effectively improved.
  • the process of acquiring the time difference between the first device and the second device includes: determining the time difference based on the first moment, the second moment, the third moment and the fourth moment; wherein, The first moment is the moment when the first device sends the first packet to the second device.
  • the second time is the time when the second device receives the first packet.
  • the third time is the time when the second device sends the second packet to the first device.
  • the fourth time is the time when the first device receives the second packet.
  • the first device sends the first packet to the second device.
  • the second device After receiving the first packet, the second device sends a second packet to the first device.
  • the first device receives the second packet sent by the second device.
  • the process of acquiring the time difference between the first device and the second device includes: determining the time difference based on the first moment, the second moment, the third moment and the fourth moment; wherein, The first time is when the second device sends the first message to the first device, the second time is when the first device receives the first message, and the third time is when the first device sends the second message to the second device The fourth time is the time when the second device receives the second packet.
  • the second device sends the first packet to the first device. After receiving the first packet, the first device sends a second packet to the second device. Correspondingly, the second device receives the second packet sent by the first device.
  • the format of the time carried in the packet may refer to the format of the timestamp in the 1588 packet.
  • the lengths of the timestamps corresponding to the first to fourth moments are all 96 bits; in a target network with general time accuracy requirements, the timestamps corresponding to the first to fourth moments Timestamps are all 80 bits long.
  • the content of the target packet transmitted between the first device and the second device for calculating the time difference between the first device and the second device may be different from the content of the traditional 1588 packet.
  • the target packet may include a message type field, where the message type field carries a performance detection identifier.
  • the performance detection flag indicates that the packet where the performance detection flag is located is used for time synchronization performance detection.
  • the target message transmitted between the first device and the second device can be compatible with the traditional 1588 message format, thereby reducing the complexity of message construction.
  • the target message includes a first message and a second message.
  • the first time difference between the first device and the satellite time is obtained through a GPS instrument; the second time difference between the second device and the satellite time is obtained through the GPS instrument; the first time difference is determined based on the first and second time differences. and the time difference between the second device.
  • the time difference is obtained by separately detecting the two devices by the GPS meter, and the time synchronization performance can be detected by only detecting the time difference between the GPS meter and the two devices. Compared with the traditional method, only by detecting the devices in the network one by one can it be determined whether the time synchronization performance of the network is abnormal, which effectively reduces the number of devices to be detected, thereby improving the detection efficiency.
  • the third device may also be notified.
  • the third device is notified by sending abnormality indication information to the third device.
  • the abnormality indication information is used to indicate that the time synchronization performance of the target network is abnormal.
  • the third device is a management device, and the abnormality indication information may be management information or alarm information.
  • the third device may send notification information to notify the staff that the time synchronization performance of the target network is abnormal. In this way, it is convenient for the staff to locate the abnormal device in the target network in time, and repair or replace the abnormal device.
  • the third device is a device in the target network that needs to perform time synchronization with the aforementioned clock source device, but has not yet performed time synchronization.
  • the third device may determine that the time synchronization performance of the target network is abnormal based on the abnormal indication information, and prohibit time synchronization with the clock source device. In order to avoid invalidation of the time after synchronization, the influence of abnormal time synchronization performance of the target network on the third device is reduced.
  • the third device is a device between the first device and the second device on the ring network.
  • the third device is a pre-designated device. For example, it is a worker's mobile terminal. The staff can quickly and conveniently determine the abnormal time synchronization performance of the target network through the third device, so as to perform maintenance of the target network in time.
  • the first device is a device adjacent to the second device in the target network. If the target network includes a ring network, the first device and the second device may be two adjacent devices on the ring network, such as leaf devices. Then the time synchronization effect of the first device reflects the time synchronization effect on one half-loop path from the first device to the clock source device; the time synchronization effect of the second device reflects the other half of the path from the second device to the clock source device. Time synchronization effect on the loop path. The time difference between the first device and the second device reflects the time synchronization effect of the entire ring network.
  • the preset threshold is a value of a preset device.
  • the preset threshold value can be read from the storage space where the preset threshold value is stored.
  • the preset threshold is calculated by the first device. You can get the preset number of hops and set the duration. The product of the preset number of hops and the set duration is determined as the preset threshold.
  • the set duration is the allowable synchronization deviation of one hop.
  • the target network includes a ring network where the first device and the second device are located, and the preset number of hops may be the total number of hops of devices in the ring network. Then the preset threshold is the product of the total number of hops and the set duration.
  • the aforementioned target network may include a ring network, and may also include a mesh network (also called a mesh network or a mesh network).
  • the mesh network can be divided into multiple ring networks according to time synchronization requirements.
  • the foregoing method for detecting time synchronization performance may be performed by the first device, the second device, or the third device.
  • the present application provides an apparatus for detecting time synchronization performance.
  • the means for detecting time synchronization performance may include at least one module.
  • the at least one module may be used to implement the method for detecting time synchronization performance provided by the first aspect or any possible implementation manner of the first aspect.
  • the present application provides a device.
  • the device includes: a processing chip and a communication port.
  • the processing chip is used to execute the method provided in the first aspect or any possible implementation manner of the first aspect; the communication port is used for the processing chip to communicate with other devices.
  • the present application provides a device.
  • the device includes a processor and memory.
  • the memory stores computer instructions; the processor executes the computer instructions stored in the memory, so that the device performs the first aspect or the method provided by any possible implementation manner of the first aspect.
  • the present application provides a computer-readable storage medium.
  • the computer-readable storage medium has computer instructions stored thereon.
  • the computer instructions instruct the device to perform the method provided by the first aspect or any possible implementation manner of the first aspect.
  • the present application provides a computer program product.
  • the computer program product includes computer instructions stored in a computer-readable storage medium.
  • the processor of the device may read the computer instructions from the computer-readable storage medium, and the processor executes the computer instructions, so that the device performs the first aspect or the method provided by any possible implementation manner of the first aspect.
  • the present application provides a time synchronization system.
  • the system includes: a target network including at least three devices, the target network including the means for detecting time synchronization performance according to the second aspect.
  • the present application provides a chip.
  • the chip may include programmable logic circuits and/or program instructions for implementing the method of detecting time synchronization performance as in any one of the first aspect when the chip is running.
  • whether the time synchronization performance of the target network is abnormal is determined based on the time difference between the first device and the second device that have completed time synchronization with the same clock source and have no time synchronization relationship.
  • FIG. 1 is a schematic diagram of an application environment provided by an embodiment of the present application.
  • FIG. 2 is a schematic flowchart of a method for detecting time synchronization performance provided by an embodiment of the present application
  • FIG. 3 is a schematic diagram of the principle that a device in a target network completes time synchronization based on the 1588 protocol provided by an embodiment of the present application;
  • FIG. 4 is a schematic diagram of another application environment provided by an embodiment of the present application.
  • FIG. 5 is a schematic flowchart of another method for detecting time synchronization performance provided by an embodiment of the present application.
  • FIG. 6 is a schematic structural diagram of an apparatus for detecting time synchronization performance provided by an embodiment of the present application.
  • FIG. 7 is a schematic structural diagram of a device provided by an embodiment of the present application.
  • FIG. 1 is a schematic diagram of an application environment involved in a method for detecting time synchronization performance provided by an embodiment of the present application.
  • the time synchronization system includes: a management device 101 and a plurality of communication devices 102 .
  • the time synchronization system is used to provide accurate reference time for wireless communication system or power relay protection system.
  • a plurality of communication devices 102 can form a ring network.
  • the communication devices on the ring network are connected end to end, and each communication device can communicate with two adjacent communication devices on the ring network. Adjacent communication devices on the ring network are directly connected by optical fibers or cables.
  • the ring network is an Ethernet ring network, an optical transport network (OTN) ring network, or a Synchronous Digital Hierarchy (Synchronous Digital Hierarchy, SDH) ring network.
  • the management device 101 is used to manage multiple communication devices 102 .
  • the management device 101 can communicate with each communication device respectively.
  • the management device 101 may be a network management device (also referred to as a network management device) or a controller (also referred to as a central controller).
  • the management device 101 may be set independently of multiple communication devices 102 , or may be a device set or elected among multiple communication devices 102 .
  • the management device 101 may be a computer, a server, a server cluster composed of multiple servers, or a cloud computing center.
  • the communication device 102 may be a network device such as an OTN wavelength division device, a router, or an access network device.
  • the management device 101 is set independently of the plurality of communication devices 102 , and the plurality of communication devices 102 form a ring network configuration as an example for description.
  • FIG. 2 is a schematic flowchart of a method for detecting time synchronization performance provided by an embodiment of the present application. The method can be applied in the application environment shown in FIG. 1 . As shown in Figure 2, the method includes:
  • the devices in the target network perform time synchronization.
  • the target network includes at least two devices for clock synchronization with the same clock source device (also called the root device). Subsequent embodiments of the present application assume that the at least two devices include a first device and a second device. Illustratively, the target network may include a ring network. Devices in the target network can be time synchronized in a number of ways. The embodiments of the present application are described by taking the following two methods as examples:
  • the devices in the target network perform time synchronization with clock source devices outside the target network respectively, so as to realize the time synchronization of the devices in the target network.
  • the clock source device is a device with a reference time (or referred to as a reference clock).
  • the reference time is satellite time.
  • the clock source device is a device in GPS, a device in Beidou system or a device in Galileo system. such as satellites.
  • the aforementioned time synchronization protocol may be a 1588 protocol, a network time protocol (Network Time Protocol, NTP), a real-time transport protocol (Real-time Transport Protocol, RTP) or other time synchronization protocols. Among them, due to the time synchronization accuracy of the 1588 protocol, this protocol is usually used to complete time synchronization.
  • the 1588 protocol is also called the precise time protocol (PTP).
  • the 1588 protocol may be 1588 version 1 or 1588 version 2 (version 2), and may also be other versions, which are not limited in this embodiment of the present application.
  • FIG. 3 is a schematic diagram of the principle of completing time synchronization based on the 1588 protocol for devices in a target network according to an embodiment of the present application.
  • the target network includes a ring network.
  • the ring network includes the aforementioned first device, second device and clock source device.
  • the devices in the ring network are all communication devices shown in FIG. 1 .
  • the target network includes 5 devices, which are devices 1 to 5 in the ring network respectively.
  • the time synchronization priority will be updated from the second priority to the first priority.
  • the first priority is higher than the second priority.
  • Two priorities are preset.
  • the time tracking algorithm in the 1588 protocol instructs to select the shortest path for tracking. Therefore, the devices in the ring network actually complete the direct time synchronization with the devices adjacent to them. Then the devices 1 to 5 complete the time synchronization by performing the following steps.
  • A1. Device 1 performs time synchronization with an external clock source device through an external time synchronization port.
  • Each non-clock source device in the ring network usually has two ports, which are mainly used for communication with adjacent devices on the ring network, such as service transfer.
  • the clock source device also has an external time synchronization port. This port is used for time synchronization with an external clock source device.
  • the external clock source device is a device outside the ring network, which has a reference time.
  • the reference time is satellite time.
  • the external clock source device is a device in GPS, a device in Beidou system or a device in Galileo system. such as satellites.
  • the device 1 After the device in the ring network starts the 1588 time synchronization function, if it detects that it can receive the message carrying the clock information through the external time synchronization port, it means that the device can perform time synchronization with the external clock source device.
  • Figure 3 assumes that device 1 has an external time synchronization port.
  • the device 1 may send a clock synchronization request to the external clock source device through the external time synchronization port. After that, a clock synchronization response sent by the external clock source device is received through the external time synchronization port.
  • the clock synchronization response carries the reference time provided by the external clock source device.
  • the external clock source device can send its own reference time through the external time synchronization port in real time. Device 1 can receive the reference time through the external time synchronization port.
  • the device 1 After the device 1 adjusts its own time based on the obtained reference time, the time synchronization with the external clock source is completed. After completing the time synchronization, the device 1 is the clock source device in the ring network. All other devices in the ring network need to perform time synchronization with the clock source device.
  • device 2 and device 5 are time-synchronized with device 1, respectively.
  • the device 1 After completing the time synchronization, the device 1 updates its own time synchronization priority from the second priority to the first priority. After that, device 2 and device 5 are time-synchronized with device 1, respectively.
  • Device 1 sends a negotiation request to Device 2, where the negotiation request includes the time synchronization priority of Device 1.
  • the device 2 After receiving the negotiation request, the device 2 compares the time synchronization priority in the negotiation request with its own time synchronization priority. When the time synchronization priority in the negotiation request is higher than its own time synchronization priority, device 2 sends a negotiation response to device 1 .
  • the negotiation response is used to instruct Device 2 to track Device 1's time. For example, after sending the negotiation response, the device 2 sets the port for sending the negotiation response as the slave (slave, S) port. After receiving the negotiation response, the device 1 sets the port receiving the negotiation response as the master (master, M) port. After that, device 2 performs time tracking on device 1.
  • the tracking process includes: the device 1 sends a first packet to the slave port of the device 2 through the master port; the slave port of the device 2 sends the second packet to the master port of the device 1 .
  • Device 2 determines the time difference with device 1 based on the first, second, third and fourth moments, and adjusts the time of device 2 based on the time difference so that the time of device 2 is consistent with the time of device 1, thereby completing time synchronization.
  • the first moment is the moment when device 1 sends the first packet to device 2
  • the second moment is the moment when device 2 receives the first packet
  • the third moment is the moment when device 2 sends the second packet to device 1
  • the fourth moment is the moment when the device 1 receives the second packet.
  • the device 1 may also send a third packet carrying the first moment and a fourth packet carrying the fourth moment to the device 2.
  • the first message is called a synchronization (sync) message; the second message is called a delay request (Delay_req) message; the third message is called a follow (Follow_up) message; the fourth message It is called a delay request response (Delay_resp) message.
  • Device 3 and device 2 perform time synchronization
  • device 4 and device 5 perform time synchronization.
  • the device 2 and the device 5 update their own time synchronization priority from the second priority to the first priority.
  • device 3 and device 2 perform time synchronization
  • device 4 and device 5 perform time synchronization.
  • the process of time synchronization reference may be made to the process of time synchronization between the device 2 and the device 1 in the foregoing A3.
  • the action of device 3 refers to the action of device 2 in A3; the action of device 2 refers to the action of device 1 in A3.
  • the action of device 4 refers to the action of device 2 in A3; the action of device 5 refers to the action of device 1 in A3.
  • Device 3 and Device 4 determine that there is no time synchronization relationship between them.
  • a time synchronization relationship refers to a relationship that requires time synchronization.
  • the device 3 and the device 4 update their own time synchronization priority from the second priority to the first priority.
  • Device 3 and Device 4 determine through negotiation that they have no time synchronization relationship.
  • device 3 sends a negotiation request to device 4 , where the negotiation request includes the time synchronization priority of device 3 .
  • the device 4 compares the time synchronization priority in the negotiation request with its own time synchronization priority.
  • device 4 When the time synchronization priority in the negotiation request is equal to its own time synchronization priority and both are the first priority, device 4 sends a negotiation response to device 3, and the negotiation response is used to indicate that device 4 and device 3 have no time synchronization relation.
  • device 4 sends a negotiation request to device 3
  • device 3 sends a negotiation response to device 4 .
  • the actions of device 3 and device 4 are reversed with respect to the aforementioned first alternative. This is not repeated in this embodiment of the present application.
  • the device 3 and the device 4 identify that the device 3 and the device 4 have no time synchronization relationship by setting the port communicating with the opposite end as a passive (P) port.
  • Degraded ports do not need to transmit time synchronization related packets.
  • the device to which the degraded port belongs is called a leaf device.
  • the device 3 sets the port that sends the negotiation response as a degraded port.
  • the device 4 sets the port receiving the negotiation response as a degraded port.
  • the devices in the target network are all directly or indirectly time synchronized with the clock source device.
  • each device directly or indirectly realizes time synchronization with the clock source device.
  • it is detected whether the time synchronization performance of the target network is abnormal. Subsequent embodiments take the first device and the second device in the target network as examples to describe the detection process.
  • the detection process includes:
  • the first device acquires the time difference between the first device and the second device. Execute S203 or S204.
  • the first device may obtain the time difference between the first device and the second device after determining that both itself and the second device have completed time synchronization and have no time synchronization relationship with the second device.
  • any device in the target network may notify other devices in the target network that the device completes time synchronization by sending a preset message.
  • the first device determines that the second device has completed time synchronization.
  • the preset message may be a message carrying the foregoing negotiation request.
  • the manner in which the first device determines that there is no time synchronization relationship with the second device may include the following two manners.
  • the time synchronization priority of the first device and the time synchronization priority of the second device are the same and both are the first priority, it is determined that there is no time synchronization relationship between the first device and the second device .
  • the first device can determine whether there is a time synchronization relationship between the first device and the second device by comparing the time synchronization priorities with the second device. If the time synchronization priorities of the two are equal, and both have a higher first priority, it means that both have completed time synchronization and do not need to perform time synchronization again, so there is no time synchronization relationship. For the process of determining that there is no time synchronization relationship, reference may be made to the process of determining that the device 3 and the device 4 do not have a time synchronization relationship in the aforementioned A4.
  • time synchronization priorities of the two are not equal, it means that the two need to be time synchronized, so there is a time synchronization relationship.
  • time synchronization relationship For the process of determining the existence of the time synchronization relationship, reference may be made to the negotiation process between the device 2 and the device 1 in the aforementioned A2.
  • the first device and the second device are a preset pair of devices that do not need time synchronization, it is determined that there is no time synchronization relationship between the first device and the second device.
  • the aforementioned management device can set the relationship of a pair of devices so that no time synchronization is required, or by searching for devices that already have a synchronization relationship, if a pair of devices has no synchronization relationship, it can be determined that they do not need to be synchronized.
  • the first device can detect whether it and the second device are a preset pair of devices that do not need time synchronization. If it is detected that the self and the second device are a preset pair of devices that do not need time synchronization, it is determined that there is no time synchronization relationship between the first device and the second device.
  • each device of the pair can be configured with a peer device that does not require time synchronization
  • each device can determine which device does not need time synchronization by querying its own records.
  • time synchronization For example, a device that does not need time synchronization is configured in the first device as the second device by the management device, and the first device can determine that time synchronization is not required with the second device by querying its own records.
  • the foregoing manner of acquiring the time difference between the first device and the second device may include the following two optional implementation manners:
  • the time difference is determined based on the packets transmitted between the first device and the second device.
  • the first device and the second device respectively send a packet to the opposite end, and determine the time difference by acquiring the sending and receiving times of the two packets.
  • the time difference can be calculated by the first device or calculated by the second device and notified of the calculation result to the first device; it can also be calculated by a third device and notified of the calculation result to the first device, the third device can be the aforementioned management device .
  • the first device sends the first packet to the second device.
  • the second device After receiving the first packet, the second device sends a second packet to the first device.
  • the first device receives the second packet sent by the second device.
  • the time difference can be determined based on t1, the second time t2, the third time t3, and the fourth time t4.
  • t1 is the time when the first device sends the first message to the second device
  • t2 is the time when the second device receives the first message
  • t3 is the time when the second device sends the second message to the first device
  • t4 It is the moment when the first device receives the second packet.
  • the actions of the first device and the second device may correspond to the actions of the device 1 and the device 2 in the aforementioned A2, respectively.
  • the first device When the time difference is calculated by the first device, the first device needs to acquire the aforementioned t2 and t3.
  • the second packet includes t2 and t3.
  • the second packet includes t2, and the second device further sends a third packet to the first device, where the third packet includes t2.
  • the second device needs to acquire the aforementioned t1 and t4.
  • the first packet includes t1
  • the first device further sends a third packet to the second device, where the third packet includes t4.
  • the first device further sends a third packet and a fourth packet to the second device, where the third packet includes t1, and the fourth packet includes t4.
  • the third device needs to obtain the aforementioned first to fourth moments.
  • the first device may send packets carrying t1 and t4 to the third device; the second device may send packets carrying t2 and t3 to the third device.
  • the second device sends the first packet to the first device.
  • the first device After receiving the first packet, the first device sends a second packet to the second device.
  • the second device receives the second packet sent by the first device.
  • the time difference can be determined based on the first time t1, the second time t2, the third time t3 and the fourth time t4.
  • t1 is the time when the second device sends the first message to the first device
  • t2 is the time when the first device receives the first message
  • t3 is the time when the first device sends the second message to the second device
  • t4 It is the moment when the second device receives the second packet.
  • the actions of the first device and the second device may correspond to the actions of the device 2 and the device 1 in the aforementioned A2, respectively.
  • the actions of the first device and the second device are reversed relative to the actions in the aforementioned first example where the time difference is calculated by the second device.
  • the actions of the first device and the second device are reversed with respect to the actions in the aforementioned first example where the time difference is calculated by the first device.
  • the time difference is calculated by the third device, the actions of the first device and the second device are reversed with respect to the actions in the aforementioned first example where the time difference is calculated by the third device. This is not repeated in this embodiment of the present application.
  • the format of the time carried in the packet may refer to the format of the timestamp in the 1588 packet.
  • the lengths of the timestamps corresponding to the first to fourth moments are all 96 bits; in a target network with general time accuracy requirements, the timestamps corresponding to the first to fourth moments Timestamps are all 80 bits long.
  • time synchronization is not required between devices without a time synchronization relationship, so there is no need to transmit time synchronization related messages between the two.
  • the first optional implementation manner in order to calculate the time difference between the first device and the second device, at least the first packet and the second packet need to be transmitted between the first device and the second device.
  • the traditional 1588 message includes a message type (MsgType) field, and the message type field is used to indicate the type of the 1588 message.
  • Different identifiers carried in the message type field represent different types of messages. For example, identifiers 0x00 and 0x02 are used to indicate the aforementioned synchronization message and delay request message, respectively.
  • the length of the message type field is usually 4 bits.
  • the identifiers 0x0E to 0x0F are reserved identifiers.
  • the target packet transmitted between the first device and the second device for calculating the time difference between the first device and the second device may multiplex traditional 1588 packets .
  • the aforementioned first to fourth packets are a synchronization packet, a delay request packet, a follow-up packet, and a delay request response packet, respectively.
  • the target packet transmitted between the first device and the second device for calculating the time difference between the first device and the second device may be the same as the traditional 1588 packet content is different.
  • the target message may include a message type field. The message type field carries the performance detection identifier.
  • the performance detection flag indicates that the packet where the performance detection flag is located is used for time synchronization performance detection.
  • the performance detection identifier may be any of the foregoing reserved identifiers, and the structure of other fields of the target packet may refer to the structure of the 1588 packet.
  • the target message transmitted between the first device and the second device can be compatible with the traditional 1588 message format, thereby reducing the complexity of message construction.
  • the target message includes a first message and a second message.
  • the target packet may further include a third packet and/or a fourth packet.
  • a and b are preset weights or weights calculated based on a preset algorithm. The weights in the weighted average algorithm are not limited in this embodiment of the present application.
  • Obtaining the time difference by transmitting packets between the first device and the second device can quickly obtain the time difference without manual participation, thereby realizing real-time detection of time synchronization performance, and effectively improving detection efficiency.
  • the first time difference between the first device and the satellite time is obtained through a GPS instrument; the second time difference between the second device and the satellite time is obtained through the GPS instrument; the first time difference and the second time difference are determined based on the first time difference.
  • the time difference between a device and a second device For example, the GPS meter establishes a connection with the first device through the measurement port of the first device, obtains the time of the first device through the established connection, and obtains the first time difference by making a difference between the time of the first device and the satellite time of the GPS meter.
  • the acquisition process of the second time difference reference may be made to the acquisition process of the first time difference.
  • the time difference is obtained by separately detecting the first device and the second device by the GPS meter, and the time synchronization performance can be detected by only detecting the time difference between the GPS meter and the two devices.
  • the traditional method only by detecting the devices in the network one by one can it be determined whether the time synchronization performance of the network is abnormal, which effectively reduces the number of devices to be detected, thereby improving the detection efficiency.
  • the first device may first acquire a preset threshold, and then compare the acquired time difference with the preset threshold. Based on the comparison result, it can be determined whether the time synchronization performance of the target network is abnormal.
  • the preset threshold value can be obtained in multiple ways.
  • the preset threshold is a value of a preset device.
  • the first device may read the preset threshold value from the storage space in which the preset threshold value is stored.
  • the preset threshold is calculated by the first device.
  • the first device may acquire a preset number of hops and a set duration.
  • the product of the preset number of hops and the set duration is determined as the preset threshold.
  • the set duration is the allowable synchronization deviation of one hop.
  • the target network includes a ring network where the first device and the second device are located, and the preset number of hops may be the total number of hops of devices in the ring network.
  • the length of the set duration is different.
  • the set duration may be 5 nanoseconds (ns).
  • the set duration can be 30 nanoseconds.
  • the first device and the second device are directly or indirectly time synchronized with the same clock source device.
  • the absolute value of the time difference is greater than the preset threshold, it means that the time difference between the first device and the second device is relatively large, and the synchronization effect between the two and the clock source device has not achieved the expected effect. Therefore, the first device and the second device belong to The synchronization performance of the target network is abnormal.
  • the time synchronization effect of the first device reflects the time synchronization effect of each device from the first device to the clock source device (each device is the device through which the shortest path between the first device and the clock source device passes).
  • the time synchronization effect of the second device reflects the time synchronization effect of each device from the second device to the clock source device (each device is the device through which the shortest path between the second device and the clock source device passes).
  • the time difference between the first device and the second device reflects the overall time synchronization effect of each device from the first device to the clock source device and from the second device to the clock source device.
  • the time synchronization effect of multiple devices in the target network can be reflected by the time difference between the two devices in the target network.
  • a time difference can reflect the time synchronization effect of most devices in the target network.
  • the detection efficiency of the time synchronization performance of the target network is effectively improved.
  • the absolute value of the aforementioned time difference is greater than the preset threshold, it indicates that the time synchronization performance of at least one device is abnormal in the device from the first device to the clock source device and the device from the second device to the clock source device.
  • the first device and the second device are two devices on the ring network.
  • the time synchronization effect of the first device reflects the time synchronization effect on the first path from the first device to the clock source device (the first path is the shortest path between the first device and the clock source device);
  • the second device The time synchronization effect of reflects the time synchronization effect on the second path from the second device to the clock source device (the second path is the shortest path between the second device and the clock source device).
  • the time difference between the first device and the second device both reflects the time on the third path (the third path is the shortest path between the first device and the second device) from the first device to the second device.
  • the gap in turn, reflects the time gap on the fourth path from the first device to the second device.
  • the fourth path consists of the first path and the second path.
  • the third path and the fourth path form a loop of the entire ring network. Therefore, the time difference between the first device and the second device actually reflects the time synchronization effect of the entire ring network. Taking the ring network shown in FIG. 3 as an example, it is assumed that the first device is device 3 and the second device is device 5 .
  • the first path is the path formed by devices 1, 2 and 3; the second path is the path formed by device 1 and device 5; the third path is the path formed by devices 3, 4 and 5; the fourth path is the device The path formed by 3, 2, 1 and 5.
  • the absolute value of the aforementioned time difference is greater than the preset threshold, it indicates that the time synchronization performance of at least one device in the ring network is abnormal.
  • the first device and the second device are two adjacent devices on the ring network, such as leaf devices. Then the time synchronization effect of the first device reflects the time synchronization effect on one half-loop path from the first device to the clock source device; the time synchronization effect of the second device reflects the other half of the path from the second device to the clock source device. Time synchronization effect on the loop path. The time difference between the first device and the second device reflects the time synchronization effect of the entire ring network. Taking the ring network shown in FIG. 3 as an example, it is assumed that the first device is device 3 and the second device is device 4 .
  • one half-ring path is the path formed by devices 1, 2 and 3; the other half-ring path is the path formed by devices 1, 5 and 4.
  • the embodiments of the present application reflect the time synchronization effect of multiple devices in the target network or even the entire ring network through the time difference between two specific devices (ie, the first device and the second device), thereby effectively reducing the number of The complexity of time synchronization performance detection improves the time synchronization performance detection efficiency of the target network.
  • the first device After determining that the time synchronization performance of the target network is abnormal, the first device sends abnormal indication information to the third device.
  • the abnormality indication information is used to indicate that the time synchronization performance of the target network is abnormal.
  • the first device can also notify the third device.
  • the third device is notified by sending abnormality indication information to the third device.
  • the third device is the aforementioned management device, and the abnormality indication information may be management information or alarm information.
  • the third device may send notification information.
  • the notification information is used to notify the staff that the time synchronization performance of the target network is abnormal. In this way, it is convenient for the staff to locate the abnormal device in the target network in time, and repair or replace the abnormal device.
  • the third device is a device in the target network that needs to perform time synchronization with the aforementioned clock source device, but has not yet performed time synchronization.
  • the third device may determine that the time synchronization performance of the target network is abnormal based on the abnormal indication information, and prohibit time synchronization with the clock source device. In order to avoid invalid time after synchronization, the influence of abnormal time synchronization performance of the target network on the third device is reduced.
  • the third device is a device between the first device and the second device on the ring network.
  • the third device is a pre-designated device. For example, it is a mobile terminal of a worker. The staff can quickly and conveniently determine that the time synchronization performance of the target network is abnormal through the third device, so as to perform maintenance of the target network in time.
  • the first device determines that the time synchronization performance of the target network is normal.
  • the first device and the second device both perform time synchronization based on the 1588 protocol. Then the time difference between the first device and the second device reflects the overall time synchronization effect of each device from the first device to the clock source device and from the second device to the clock source device.
  • the absolute value of the aforementioned time difference is not greater than the preset threshold, it means that the time synchronization performance of the device from the first device to the clock source device and from the second device to the clock source device is normal.
  • the target network includes a ring network
  • the first device and the second device are two devices on the ring network. Then the time difference between the first device and the second device reflects the time synchronization effect of the entire ring network.
  • the absolute value of the aforementioned time difference is not greater than the preset threshold, it means that the time synchronization performance of the devices on the ring network is normal.
  • the first device may stop the action.
  • the normal indication information may also be sent to the third device, where the normal indication information is used to indicate that the time synchronization performance of the target network is normal.
  • S201 to S205 may be periodically performed according to the time synchronization and detection needs of the target network. It can also be executed after the first specified condition is satisfied. For example, it is executed after the target network is initially deployed; or, it is executed after the management device sends a trigger instruction indicating time synchronization to the target network.
  • S202 to S205 may be performed periodically according to the detection requirements of the target network, or may be performed after the second specified condition is satisfied. For example, it is executed after each time synchronization of the target network; or, it is executed after the management device sends a trigger instruction instructing to perform abnormal performance detection to the devices in the target network.
  • sequence of steps of the method for detecting time synchronization performance provided by the embodiments of the present application may be appropriately adjusted, and the steps may be correspondingly increased or decreased according to the situation.
  • the aforementioned S205 may not be performed. Any person skilled in the art who is familiar with the technical scope of the present application can easily think of any variation of the method, which should be covered by the protection scope of the present application, and therefore will not be repeated here.
  • the method for detecting the time synchronization performance does not need to use an additional GPS instrument to detect the devices in the network one by one, which effectively improves the detection efficiency of the time synchronization performance of the target network.
  • the time difference is obtained based on the packets transmitted between the first device and the second device, real-time detection of the time synchronization performance of the target network can also be realized, and the detection delay and detection cost can be reduced.
  • FIG. 1 takes a ring network formed by a plurality of communication devices 102 as an example to illustrate the application environment involved in the method for detecting time synchronization performance.
  • the method for detecting time synchronization performance can also be applied to other types of networks.
  • FIG. 4 is a schematic diagram of another application environment involved in a method for detecting time synchronization performance provided by an embodiment of the present application.
  • multiple communication devices 102 included in the time synchronization system form a mesh network (also called mesh network or mesh networking).
  • FIG. 4 assumes that the plurality of communication devices 102 includes communication devices 1021 to 1025 .
  • the mesh network may be divided into multiple ring networks according to time synchronization requirements.
  • the mesh network in FIG. 4 can be divided into three ring networks, namely the first ring network composed of communication devices 1021, 1022, 1023 and 1024, and the second ring network composed of communication devices 1023, 1024 and 1025, and a third ring network composed of communication devices 1021 , 1024 , 1025 , 1023 and 1022 .
  • the manner in which the mesh network divides the ring network may be pre-configured or indicated by the management device 101 .
  • FIG. 2 is described by taking the foregoing method for detecting time synchronization performance being executed by the first device as an example.
  • the method for detecting time synchronization performance may also be executed by a second device, or executed by a third device.
  • the actions of the first device and the second device are reversed with respect to the aforementioned S202 to S205.
  • FIG. 5 is a schematic flowchart of another method for detecting time synchronization performance provided by an embodiment of the present application.
  • FIG. 5 assumes that the method of detecting time synchronization performance is performed by a third device.
  • the method can be applied to the application environment shown in FIG. 1 or FIG. 4 . As shown in Figure 5, the method includes:
  • the devices in the target network perform time synchronization.
  • the third device acquires the time difference between the first device and the second device. Execute S303 or S304.
  • the third device may obtain the time difference between the first device and the second device after determining that both the first device and the second device have completed time synchronization, and the first device and the second device have no time synchronization relationship.
  • the first device and the second device send the first communication packet to the third device after completing time synchronization respectively.
  • the first notification message is used to instruct the corresponding device to complete time synchronization.
  • the third device determines that the first device and the second device have completed time synchronization respectively.
  • the first device may send the second communication packet to the third device after determining that both itself and the second device have completed time synchronization.
  • the second device sends the second communication message to the third device.
  • the second notification message is used to instruct the first device and the second device to complete time synchronization respectively.
  • the third device determines that the first device and the second device have completed time synchronization respectively.
  • the manner in which the third device determines that the first device and the second device have no time synchronization relationship may include the following two manners.
  • the time synchronization priority of the first device and the time synchronization priority of the second device are the same and both are the first priority, it is determined that there is no time synchronization relationship between the first device and the second device .
  • the first device or the second device may send the third communication packet to the third device after determining that there is no time synchronization relationship between the first device and the second device.
  • the third communication packet is used to indicate that there is no time synchronization relationship between the first device and the second device.
  • the third device determines that there is no time synchronization relationship between the first device and the second device.
  • the first device and the second device send a fourth communication packet to the third device after completing time synchronization.
  • the fourth notification message is used to indicate the time synchronization priority of the corresponding device.
  • the third device determines, based on the time synchronization priority carried in the message, the time synchronization priority of the first device and the time synchronization priority of the second device are the same, and both are the first priority. Accordingly, it is determined that there is no time synchronization relationship between the first device and the second device.
  • the first device and the second device are a preset pair of devices that do not need time synchronization, it is determined that there is no time synchronization relationship between the first device and the second device.
  • a pair of devices that do not need time synchronization can be set by the third device. There is no need to perform time synchronization between the pair of devices, that is, the time synchronization relationship is released.
  • the third device detects preset information. When it is detected that the first device and the second device are a preset pair of devices that do not need time synchronization, it is determined that there is no time synchronization relationship between the first device and the second device.
  • the third device acquires the time difference
  • the first device sends the time difference to the third device after completing the time difference calculation.
  • the second device sends the time difference to the third device after completing the time difference calculation. If the time difference is calculated by the third device, after the third device completes the time difference calculation, it is not necessary to send the time difference to the first device.
  • the third device determines that the time synchronization performance of the target network is abnormal.
  • the third device determines that the time synchronization performance of the target network is normal.
  • S301, S303, and S304 may refer to the aforementioned processes in S201, S203, and S204, respectively. This is not repeated in this embodiment of the present application. It should be noted that the foregoing S301 to S304 may be performed periodically according to the time synchronization and detection needs of the target network, or may be performed after the foregoing first specified condition is satisfied. Alternatively, after the foregoing S301 is executed, S302 to S304 may be executed periodically according to the detection needs of the target network, or may be executed after the foregoing second specified condition is satisfied.
  • the method for detecting the time synchronization performance does not need to use an additional GPS instrument to detect the devices in the network one by one, which effectively improves the detection efficiency of the time synchronization performance of the target network.
  • the beneficial effects of the apparatus embodiments are similar to those of the corresponding steps of the method, and details are not described below.
  • FIG. 6 is a schematic structural diagram of an apparatus 40 for detecting time synchronization performance provided by an embodiment of the present application.
  • the apparatus 40 includes: an acquisition module 401 and a first determination module 402 .
  • the obtaining module 401 is configured to obtain the time difference between the first device and the second device.
  • the first device is in a state of completing time synchronization with the clock source device.
  • the second device is in a state of completing time synchronization with the clock source device.
  • the first determination module 402 is configured to determine that the time synchronization performance of the target network is abnormal when the absolute value of the time difference is greater than a preset threshold.
  • the target network is the network to which the first device and the second device belong.
  • the obtaining module 401 is configured to: determine the time difference based on the first moment, the second moment, the third moment and the fourth moment.
  • the first moment is the moment when the first device sends the first packet to the second device.
  • the second time is the time when the second device receives the first packet.
  • the third time is the time when the second device sends the second packet to the first device.
  • the fourth time is the time when the first device receives the second packet.
  • the first device includes the apparatus 40 .
  • the apparatus 40 further includes: a first sending module and a receiving module.
  • the first sending module is used for sending the first message to the second device; the receiving module is used for receiving the second message sent by the second device.
  • both the first packet and the second packet include a message type field, and the message type field carries a performance detection identifier, and the performance detection identifier indicates that the packet where the performance detection identifier is located is used for time synchronization performance detection.
  • the apparatus 40 further includes: a second determining module.
  • the second determining module is configured to determine that there is no relationship between the first device and the second device if the time synchronization priority of the first device and the time synchronization priority of the second device are the same and both are the first priority. Time synchronization relationship.
  • the apparatus 40 further includes: a third determination module. The third determining module is configured to determine that there is no time synchronization relationship between the first device and the second device if both the first device and the second device are preset devices that do not need time synchronization.
  • the apparatus 40 further includes: a second sending module.
  • the second sending module is configured to send abnormal indication information to the third device after determining that the time synchronization performance of the target network is abnormal.
  • the abnormality indication information is used to indicate that the time synchronization performance of the target network is abnormal.
  • the first device is a device adjacent to the second device in the target network.
  • the devices in the target network can complete time synchronization based on the 1588 protocol.
  • the target network includes a ring network
  • the ring network includes the first device and the second device
  • the preset threshold is the product of the total number of hops of devices in the ring network and a set duration
  • the set duration is The allowable synchronization skew of one hop.
  • An embodiment of the present application provides a time synchronization system, including: a target network including at least three devices, where the target network includes the device for determining time synchronization performance according to any of the foregoing embodiments.
  • the time synchronization system may be the time synchronization system shown in FIG. 1 or FIG. 4 .
  • the target network includes one or more ring networks.
  • FIG. 7 is a schematic structural diagram of a device 50 provided by an embodiment of the present application.
  • the device 50 includes: a processing chip 501 and a communication port 502 .
  • the device 50 shown in FIG. 7 can be applied to the first device, the second device or the third device of the time synchronization system.
  • the processing chip 501 may be a field programmable gate array (Field Programmable Gate Array, FPGA) or an integrated circuit (Application Specific Integrated Circuit, ASIC) chip.
  • the processing chip 501 is configured to execute the method for detecting time synchronization performance provided by the foregoing embodiments.
  • the communication port 502 is used for the processing chip 501 to communicate with other devices.
  • the communication port 502 is an optical transceiver, which is used for the processing chip 501 to communicate with other devices through an optical fiber.
  • the processing chip 501 includes a cache structure, such as a storage structure inside an FPGA or an ASIC chip.
  • the device 501 further includes: a memory.
  • the memory is flash memory.
  • the above-mentioned embodiments it may be implemented in whole or in part by software, hardware, firmware or any combination thereof.
  • software it may be implemented in whole or in part in the form of a computer program product comprising one or more computer instructions.
  • the computer program instructions When the computer program instructions are loaded and executed on a computer, all or part of the processes or functions described in the embodiments of the present application are generated.
  • the computer may be a general purpose computer, a computer network, or other programmable device.
  • the computer instructions may be stored in or transmitted from one computer-readable storage medium to another computer-readable storage medium, for example, the computer instructions may be downloaded from a website, computer, server, or data
  • the center transmits to another website site, computer, server, or data center by wire (eg, coaxial cable, optical fiber, digital subscriber line) or wireless (eg, infrared, wireless, microwave, etc.).
  • the computer-readable storage medium can be any available medium that can be accessed by a computer or a data storage device such as a server, a data center, etc. that includes one or more available media integrated.
  • the usable media may be magnetic media (eg, floppy disks, hard disks, magnetic tapes), optical media, or semiconductor media (eg, solid state drives), and the like.
  • the terms “first”, “second” and “third” are used for descriptive purposes only and should not be understood as indicating or implying relative importance.
  • the term “at least one” refers to one or more, and the term “plurality” refers to two or more, unless expressly limited otherwise.
  • A refers to B, which means that A is the same as B or A is a simple variation of B.
  • time synchronization system when the time synchronization system provided in the above-mentioned embodiment executes the method for detecting time synchronization performance, only the division of the above-mentioned functional modules is used as an example for illustration.
  • the functional modules of the device are completed, that is, the internal structure of the device is divided into different functional modules to complete all or part of the functions described above.
  • the time synchronization system provided in the above embodiment and the method embodiment for detecting time synchronization performance belong to the same concept, and the specific implementation process thereof is detailed in the method embodiment, which will not be repeated here.

Landscapes

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

Abstract

本申请公开了一种检测时间同步性能的方法、装置及系统，属于通信领域。所述方法包括：获取第一设备和第二设备之间的时间差，所述第一设备处于与时钟源设备完成时间同步的状态，所述第二设备处于与所述时钟源设备完成时间同步的状态，所述第一设备与第二设备之间无时间同步关系；当所述时间差的绝对值大于预设阈值时，确定目标网络的时间同步性能异常，所述目标网络为所述第一设备和所述第二设备所属网络。本申请能够提高网络的时间同步性能检测效率。

Description

检测时间同步性能的方法、装置及系统
本申请要求于2021年1月13日提交中国国家知识产权局、申请号为202110042241.2、申请名称为“检测时间同步性能的方法、装置及系统”的中国专利申请的优先权，其全部内容通过引用结合在本申请中。
技术领域
本申请涉及通信领域，特别涉及一种检测时间同步性能的方法、装置及系统。
背景技术
时间同步(也称时间跟踪或时钟同步)技术指的是通信系统中至少两个设备的时间保持同步的技术。在该至少两个设备完成时间同步后，可以检测该至少两个设备的时间同步性能是否异常，以确定该至少两个设备的整体时间同步效果。
目前，对于完成时间同步的网络，例如环网(包括至少三个首尾相连的设备)，可以通过全球定位系统(Global Positioning System，GPS)仪表逐个测量该网络中的设备的时间同步性能。每个设备的测量过程可以包括：GPS仪表通过GPS组件和卫星实现时间同步，使得GPS仪表的时间为卫星时间。之后该GPS仪表通过测量端口与设备建立连接。通过建立的连接获取设备的时间。将设备的时间与GPS仪表的卫星时间做差。若该差值的绝对值大于预设的预设阈值，确定该设备的时间同步性能异常。若网络中任一设备的时间同步性能异常，则确定该网络的时间同步性能异常。
但是，前述检测时间同步性能的方法需要逐个检测网络中的设备才能确定网络的时间同步性能是否异常，导致该网络的时间同步性能检测效率低。
发明内容
本申请实施例提供了一种检测时间同步性能的方法、装置及系统，以提升时间同步性能的检测效率。
第一方面，本申请提供了一种检测时间同步性能的方法。该方法包括：获取第一设备和第二设备之间的时间差。该第一设备处于与时钟源设备完成时间同步的状态。该第二设备处于与该时钟源设备完成时间同步的状态，该第一设备与第二设备之间无时间同步关系。当该时间差的绝对值大于预设阈值时，确定目标网络的时间同步性能异常。该目标网络为该第一设备和该第二设备所属网络。可选地，该目标网络中的设备基于时间同步协议完成时间同步。例如1588协议、NTP、RTP或其他时间同步协议。
本申请实施例中，在第一设备和第二设备均完成时间同步，且第一设备与第二设备无时间同步关系的情况下，基于第一设备和第二设备的时间差来确定目标网络的时间同步性能是否异常，从而快速地确定目标网络的时间同步性能是否异常。并且该检测时间同步性能的方法无需采用额外的GPS仪表逐一对网络中的设备进行检测，有效提高了目标网络的时间同步性能的检测效率。
其中，确定与第二设备无时间同步关系的方式可以包括以下两种方式：在第一种方式中， 若第一设备的时间同步优先级与第二设备的时间同步优先级相同，且均为第一优先级，则确定第一设备与第二设备之间无时间同步关系。在第二种方式中，若第一设备与第二设备为预设的一对无需时间同步的设备，则确定第一设备与第二设备之间无时间同步关系。
获取第一设备和第二设备之间的时间差的方式可以包括以下两种可选实现方式：
在第一种可选实现方式中，基于第一设备和第二设备之间传输的报文确定时间差。第一设备和第二设备分别向对端发送一个报文。通过获取两个报文的收发时刻，来确定该时间差。该时间差可以由第一设备计算，也可以由第二设备计算并将计算结果通知第一设备，还可以由第三设备计算并将计算结果通知第一设备。该第三设备可以为管理设备。通过第一设备和第二设备之间传输报文来获取时间差，可以无需人工参与，实现时间差的快速获取。进而实现时间同步性能的实时检测，有效提高检测效率。
在第一种示例中，该获取该第一设备和该第二设备之间的时间差的过程，包括：基于第一时刻、第二时刻、第三时刻以及第四时刻，确定该时间差；其中，该第一时刻为该第一设备向该第二设备发送第一报文的时刻。该第二时刻为该第二设备接收该第一报文的时刻。该第三时刻为该第二设备向该第一设备发送该第二报文的时刻。该第四时刻为该第一设备接收该第二报文的时刻。在该示例中，第一设备向第二设备发送第一报文。第二设备在接收到该第一报文后，向第一设备发送第二报文。相应的，第一设备接收第二设备发送的第二报文。
在第二种示例中，该获取该第一设备和该第二设备之间的时间差的过程，包括：基于第一时刻、第二时刻、第三时刻以及第四时刻，确定该时间差；其中，第一时刻为第二设备向第一设备发送第一报文的时刻，第二时刻为第一设备接收第一报文的时刻，第三时刻为第一设备向第二设备发送第二报文的时刻，第四时刻为第二设备接收第二报文的时刻。在该示例中，第二设备向第一设备发送第一报文。第一设备在接收到该第一报文后，向第二设备发送第二报文。相应的，第二设备接收第一设备发送的第二报文。
前述两种示例中，报文中携带的时刻的格式可以参考1588报文中时间戳的格式。例如，在时间精度要求较高的目标网络中，前述第一至第四时刻对应的时间戳的长度均为96比特；在时间精度要求一般的目标网络中，前述第一至第四时刻对应的时间戳的长度均为80比特。
在本申请实施例中，第一设备和第二设备之间传输的用于计算第一设备和第二设备之间的时间差的目标报文可以与传统的1588报文的内容不同。例如，目标报文可以包括消息类型字段，该消息类型字段携带性能检测标识。该性能检测标识指示性能检测标识所在报文用于进行时间同步性能的检测。如此，第一设备和第二设备之间传输的目标报文可以兼容传统的1588报文的格式，减少报文构造的复杂度。示例地，该目标报文包括第一报文和第二报文。
在第二种可选实现方式中，通过GPS仪表获取第一设备与卫星时间的第一时差；通过GPS仪表获取第二设备与卫星时间的第二时差；基于第一和第二时差确定第一和第二设备之间的时间差。通过GPS仪表对两个设备分别检测来获取时间差，可以通过仅检测GPS仪表与两个设备的时间差来实现时间同步性能的检测。相对于传统方法中逐个检测网络中的设备才能确定网络的时间同步性能是否异常，有效减少了检测的设备数量，从而提高检测效率。
可选地，在确定目标网络的时间同步性能异常后，还可以对第三设备进行通知。例如通过向第三设备发送异常指示信息来通知第三设备。该异常指示信息用于指示该目标网络的时间同步性能异常。在一种可选实现方式中，第三设备为管理设备，该异常指示信息可以为管理信息或者告警信息。第三设备在获取该异常指示信息后，可以发出通知信息，用于通知工作人员该目标网络的时间同步性能异常。如此，可以便于工作人员及时对目标网络中出现异 常的设备进行定位，并对出现异常的设备进行维修或更换。在另一种可选实现方式中，第三设备为目标网络中需要与前述时钟源设备进行时间同步，但还未进行时间同步的设备。第三设备可以在基于异常指示信息确定该目标网络的时间同步性能异常，禁止与时钟源设备进行时间同步。以避免同步后的时间无效，降低目标网络的时间同步性能异常对第三设备的影响。例如，当第一设备和第二设备为环网上非相邻的设备时，第三设备为环网上第一设备和第二设备之间的设备。在又一种可选实现方式中，第三设备为预先指定的设备。例如，其为工作人员的移动终端。工作人员可以通过该第三设备快速便捷地确定目标网络的时间同步性能异常，从而及时进行目标网络的维护。
在一种可选方式中，该第一设备为该目标网络中与该第二设备相邻的设备。若该目标网络包括环网，第一设备和第二设备可以为环网上的两个相邻的设备，例如叶子设备。则第一设备的时间同步效果反映了从第一设备到时钟源设备的一个半环路径上的时间同步效果；第二设备的时间同步效果反映了从第二设备到时钟源设备的另一个半环路径上的时间同步效果。第一设备和第二设备之间的时间差反映了整个环网的时间同步效果。
前述预设阈值有多种获取方式。在一种示例中，该预设阈值为预先设备的数值。可以从存储该预设阈值的存储空间读取该预设阈值。在另一种示例中，该预设阈值由第一设备计算得到。可以获取预设跳数，以及设定时长。将预设跳数与设定时长的乘积确定为预设阈值。该设定时长为一跳的允许同步偏差。示例地，该目标网络包括第一设备和第二设备所在环网，则预设跳数可以为环网中设备的总跳数。则该预设阈值为总跳数与设定时长的乘积。
值得说明的是，前述目标网络可以包括环网，也可以包括网格网络(也称mesh网络或mesh组网)。该网格网络可以根据时间同步需求划分为多个环网。前述检测时间同步性能的方法可以由第一设备、第二设备，或者第三设备执行。
第二方面，本申请提供一种检测时间同步性能的装置。该检测时间同步性能的装置可以包括至少一个模块。该至少一个模块可以用于实现上述第一方面或者第一方面的任一可能实现方式提供的该检测时间同步性能的方法。
第三方面，本申请提供一种设备。该设备包括：处理芯片和通信端口。该处理芯片用于执行上述第一方面或者第一方面的任一可能实现方式提供的方法；该通信端口用于供该处理芯片与其他设备进行通信。
第四方面，本申请提供一种设备。该设备包括处理器和存储器。该存储器存储计算机指令；该处理器执行该存储器存储的计算机指令，使得该设备执行上述第一方面或者第一方面的任一可能实现方式提供的方法。
第五方面，本申请提供一种计算机可读存储介质。该计算机可读存储介质中存储有计算机指令。该计算机指令指示设备执行上述第一方面或者第一方面的任一可能实现方式提供的方法。
第六方面，本申请提供一种计算机程序产品。该计算机程序产品包括计算机指令，该计算机指令存储在计算机可读存储介质中。设备的处理器可以从计算机可读存储介质读取该计算机指令，处理器执行该计算机指令，使得该设备执行上述第一方面或者第一方面的任一可能实现方式提供的方法。
第七方面，本申请提供一种时间同步系统。该系统包括：包括至少三个设备的目标网络，所述目标网络包括如第二方面的检测时间同步性能的装置。
第八方面，本申请提供一种芯片。该芯片可以包括可编程逻辑电路和/或程序指令，当该 芯片运行时用于实现如第一方面任一的检测时间同步性能的方法。
综上所述，本申请实施例中，基于与同一时钟源完成时间同步且无时间同步关系的第一设备和第二设备的时间差来确定目标网络的时间同步性能是否异常。从而快速地确定目标网络的时间同步性能是否异常，有效提高了目标网络的时间同步性能的检测效率。
附图说明
图1是本申请实施例提供的一种应用环境示意图；
图2是本申请实施例提供的一种检测时间同步性能的方法的流程示意图；
图3是本申请实施例提供的一种目标网络中的设备基于1588协议完成时间同步的原理示意图；
图4是本申请实施例提供的另一种应用环境示意图；
图5是本申请实施例提供的另一种检测时间同步性能的方法的流程示意图；
图6是本申请实施例提供的一种检测时间同步性能的装置的结构示意图；
图7是本申请实施例提供的一种设备的结构示意图。
具体实施方式
为使本申请的原理和技术方案更加清楚，下面将结合附图对本申请实施方式作进一步地详细描述。
图1是本申请实施例提供的一种检测时间同步性能的方法所涉及的一种应用环境示意图。该应用环境中，时间同步系统包括：管理设备101和多个通信设备102。该时间同步系统用于为无线通信系统或者电力继电保护系统提供精确的参考时间。可选地，多个通信设备102能够组成一个环网。该环网上的通信设备首尾相连，每个通信设备可以与环网上相邻的两个通信设备通信。环网上相邻的通信设备通过光纤或电缆直接相连。示例地，该环网为以太环网、光传送网(optical transport network，OTN)环网、同步数字体系(Synchronous Digital Hierarchy，SDH)环网。其中，管理设备101用于管理多个通信设备102。该管理设备101可以与各个通信设备分别通信。管理设备101可以为网络管理设备(也称网管设备)或控制器(也称中心控制器)。在实际实现时，管理设备101可以独立于多个通信设备102设置，也可以为在多个通信设备102中设定或选举得到的一个设备。该管理设备101可以为计算机、服务器、由多个服务器组成的服务器集群或者云计算中心。通信设备102可以为OTN波分设备、路由器或接入网设备等网络设备。图1以该时间同步系统中，管理设备101独立于多个通信设备102设置，且该多个通信设备102组成一个环网设置为例进行说明。
图2是本申请实施例提供的一种检测时间同步性能的方法的流程示意图。该方法可以应用于图1所示的应用环境中。如图2所示，该方法包括：
S201、目标网络中的设备进行时间同步。
目标网络包括用于与同一时钟源设备(也称根设备)进行时钟同步的至少两个设备。本申请后续实施例假设该至少两个设备包括第一设备和第二设备。示例地，目标网络可以包括环网。目标网络中的设备可以采用多种方式进行时间同步。本申请实施例以以下两种方式为例进行说明：
在第一种方式中，目标网络中的设备分别与目标网络外部的时钟源设备进行时间同步，以实现目标网络中的设备的时间同步。示例地，该时钟源设备为具有参考时间(或称参考时钟)的设备。例如，该参考时间为卫星时间。该时钟源设备为GPS中的设备、北斗系统中的设备或伽利略系统中的设备。如卫星。
在第二种方式中，目标网络中的设备基于时间同步协议完成时间同步。前述时间同步协议可以为1588协议、网络时间协议(Network Time Protocol，NTP)、实时传输协议(Real-time Transport Protocol，RTP)或其他时间同步协议。其中，由于1588协议的时间同步精度，因此通常采用该协议来完成时间同步。该1588协议又称精确时间协议(precise time protocol，PTP)。1588协议可以为1588版本1或1588版本2(version 2)，还可以为其他版本，本申请实施例对此不做限定。
图3是本申请实施例提供的一种目标网络中的设备基于1588协议完成时间同步的原理示意图。图3假设目标网络包括环网。该环网包括前述第一设备、第二设备以及时钟源设备。可选地，该环网中的设备均为图1所示的通信设备。图3中假设目标网络包括5个设备，分别为环网中的设备1至5。需要说明的是，基于1588协议的目标网络中任一设备完成时间同步后，会将时间同步优先级由第二优先级更新为第一优先级。该第一优先级高于第二优先级。两个优先级是预先设置的。并且，1588协议中的时间跟踪算法指示选择最短路径进行跟踪。因此，环网中的设备实际是与自身相邻的设备完成直接的时间同步。则该设备1至5通过执行以下步骤完成时间同步。
A1、设备1通过外部时间同步端口与外部时钟源设备进行时间同步。
环网中的每个非时钟源设备(如设备2至4中任一设备)通常具有两个端口，主要用于与环网上相邻的设备进行通信，如业务传递。而时钟源设备除了该两个端口外，还具有外部时间同步端口。该端口用于与外部时钟源设备进行时间同步。该外部时钟源设备为环网之外的设备，其具有参考时间。例如，该参考时间为卫星时间。示例地，该外部时钟源设备为GPS中的设备、北斗系统中的设备或伽利略系统中的设备。如卫星。
环网中的设备在启动1588时间同步功能后，若检测到自身能够通过外部时间同步端口接收到携带时钟信息的报文，则说明该设备可以与外部时钟源设备进行时间同步。图3假设设备1具有外部时间同步端口。在一种实现方式中，设备1可以通过该外部时间同步端口向该外部时钟源设备发送时钟同步请求。之后，通过该外部时间同步端口接收该外部时钟源设备发送时钟同步响应。该时钟同步响应携带该外部时钟源设备提供的参考时间。在另一种实现方式中，外部时钟源设备可以实时通过该外部时间同步端口发送自身的参考时间。设备1可以通过该外部时间同步端口接收该参考时间。
设备1基于获取的参考时间调整自身的时间后，即完成与外部时钟源的时间同步。完成时间同步后的设备1即为环网中的时钟源设备。环网中的其他设备均需要与该时钟源设备进行时间同步。
A2、设备2和设备5分别与设备1进行时间同步。
设备1在完成时间同步后，将自身的时间同步优先级由第二优先级更新为第一优先级。之后，设备2和设备5分别与设备1进行时间同步。下面以设备2与设备1进行时间同步的过程为例进行说明，设备5与设备1进行时间同步的过程可以参考该过程。设备1向设备2发送协商请求，该协商请求包括设备1的时间同步优先级。设备2在接收到协商请求后，比较协商请求中的时间同步优先级与自身的时间同步优先级。当该协商请求中的时间同步优先级高于自身的时间同步优先级时，设备2向设备1发送协商响应。该协商响应用于指示设备2跟踪设备1的时间。示例地，设备2在发送协商响应后将发送该协商响应的端口设置为从(slave，S)端口。设备1接收到协商响应后将接收该协商响应的端口设置为主(master，M)端口。之后，设备2对设备1进行时间跟踪。该跟踪过程包括：设备1通过主端口向设备2 的从端口发送第一报文；设备2的从端口向设备1的主端口发送第二报文。设备2基于第一时刻、第二时刻、第三时刻以及第四时刻，确定与设备1的时间差，并基于该时间差调整设备2的时间，使得设备2的时间与设备1的时间一致，从而完成时间同步。其中，第一时刻为设备1向设备2发送第一报文的时刻，第二时刻为设备2接收第一报文的时刻，第三时刻为设备2向设备1发送第二报文的时刻，第四时刻为设备1接收第二报文的时刻。在一种可选示例中，设备1还可以向设备2发送携带该第一时刻的第三报文，以及携带该第四时刻的第四报文。在1588协议中，该第一报文称为同步(sync)报文；第二报文称为延迟请求(Delay_req)报文；第三报文称为跟随(Follow_up)报文；第四报文称为延迟请求响应(Delay_resp)报文。
A3、设备3与设备2进行时间同步，设备4与设备5进行时间同步。
设备2和设备5在完成时间同步后，将自身的时间同步优先级由第二优先级更新为第一优先级。之后，设备3与设备2进行时间同步，设备4与设备5进行时间同步。该时间同步的过程可以参考前述A3中设备2与设备1进行时间同步的过程。其中，在设备3与设备2进行时间同步的过程中，设备3的动作参考A3中设备2的动作；设备2的动作参考A3中设备1的动作。同理，在设备4与设备5进行时间同步的过程中，设备4的动作参考A3中设备2的动作；设备5的动作参考A3中设备1的动作。
A4、设备3和设备4确定两者无时间同步关系。
时间同步关系指的是需要进行时间同步的关系。设备3和设备4在完成时间同步后，将自身的时间同步优先级由第二优先级更新为第一优先级。之后，设备3和设备4通过协商来确定两者无时间同步关系。在第一种可选示例中，设备3向设备4发送协商请求，该协商请求包括设备3的时间同步优先级。设备4在接收到协商请求后，比较协商请求中的时间同步优先级与自身的时间同步优先级。当该协商请求中的时间同步优先级等于自身的时间同步优先级，且均为第一优先级时，设备4向设备3发送协商响应，该协商响应用于指示设备4与设备3无时间同步关系。在第二种可选示例中，设备4向设备3发送协商请求，设备3向设备4发送协商响应。设备3和设备4的动作相对于前述第一种可选示例进行对调。本申请实施例对此不做赘述。
传统技术中，无时间同步关系的设备之间无需时间同步。因此两者之间无需传输时间同步相关报文，如前述第一报文至第四报文。示例地，设备3和设备4通过将与对端通信的端口设置为劣化(passive，P)端口来标识设备3和设备4无时间同步关系。劣化端口无需进行时间同步相关报文的传输。在环网中，劣化端口所属设备称为叶子设备。例如，在前述第一种可选示例执行后，设备3在发送协商响应后将发送该协商响应的端口设置为劣化端口。设备4接收到协商响应后将接收该协商响应的端口设置为劣化端口。
如前所述，目标网络中的设备均直接或间接地与时钟源设备完成了时间同步。例如图3中，基于1588协议进行时间同步的环网中，各个设备均直接或间接实现了与时钟源设备的时间同步。本申请实施例在目标网络中的设备完成时间同步后，对该目标网络的时间同步性能是否异常进行检测。后续实施例以目标网络中的第一设备和第二设备为例，对该检测过程进行说明。假设第一设备处于与时钟源设备完成时间同步的状态，第二设备处于与时钟源设备完成时间同步的状态，第一设备与第二设备之间无时间同步关系。则该检测过程包括：
S202、第一设备获取第一设备和第二设备之间的时间差。执行S203或S204。
第一设备可以在确定自身以及第二设备均完成时间同步，且与第二设备无时间同步关系 后，再获取第一设备和第二设备之间的时间差。
本申请实施例中，目标网络中的任一设备在完成时间同步后，可以通过发送预设报文来通知目标网络中其他设备该设备完成时间同步。第一设备在接收到第二设备发送的预设报文后，确定该第二设备完成时间同步。示例地，该预设报文可以为携带前述协商请求的报文。
可选地，第一设备确定与第二设备无时间同步关系的方式可以包括以下两种方式。
在第一种方式中，若第一设备的时间同步优先级与第二设备的时间同步优先级相同，且均为第一优先级，则确定第一设备与第二设备之间无时间同步关系。
如图3所示，目标网络中任一设备完成时间同步后，会将时间同步优先级由较低的第二优先级更新为较高的第一优先级。则第一设备通过比较与第二设备的时间同步优先级可以确定两者是否存在时间同步关系。若两者的时间同步优先级相等，且均为较高的第一优先级，说明两者均已完成时间同步，无需再次进行时间同步，因此无时间同步关系。该确定无时间同步关系的过程可以参考前述A4中设备3和设备4确定两者无时间同步关系的过程。若两者的时间同步优先级不等，说明两者需要进行时间同步，因此存在时间同步关系。该确定存在时间同步关系的过程可以参考前述A2中设备2和设备1的协商过程。
在第二种方式中，若第一设备与第二设备为预设的一对无需时间同步的设备，则确定第一设备与第二设备之间无时间同步关系。
示例地，可通过前述管理设备将一对设备的关系设置为无需时间同步，或者通过查找已经存在有同步关系的设备，如果某一对设备无同步关系，则可以判定他们之间无需同步。第一设备可以检测自身和第二设备是否为预设的一对无需时间同步的设备。若检测得到自身和第二设备为预设的一对无需时间同步的设备，则确定第一设备与第二设备之间无时间同步关系。在实际实现时，当一对设备无需时间同步，还可在该一对设备的每个设备中配置无需时间同步的对端设备，则每个设备通过查询自身的记录即可确定与哪个设备无需时间同步。例如，通过管理设备在第一设备中配置无需时间同步的设备为第二设备，则第一设备通过查询自身的记录即可确定与第二设备无需时间同步。
可选地，前述获取第一设备和第二设备之间的时间差的方式可以包括以下两种可选实现方式：
在第一种可选实现方式中，基于第一设备和第二设备之间传输的报文确定时间差。第一设备和第二设备分别向对端发送一个报文，通过获取两个报文的收发时刻，来确定该时间差。该时间差可以由第一设备计算，也可以由第二设备计算并将计算结果通知第一设备；还可以由第三设备计算并将计算结果通知第一设备，该第三设备可以为前述管理设备。
在第一种示例中，第一设备向第二设备发送第一报文。第二设备在接收到该第一报文后，向第一设备发送第二报文。相应的，第一设备接收第二设备发送的第二报文。之后，即可基于t1、第二时刻t2、第三时刻t3以及第四时刻t4，确定时间差。其中，t1为第一设备向第二设备发送第一报文的时刻，t2为第二设备接收第一报文的时刻，t3为第二设备向第一设备发送第二报文的时刻，t4为第一设备接收第二报文的时刻。在这种情况下，第一设备和第二设备的动作可以分别对应参考前述A2中设备1和设备2的动作。
当该时间差由第一设备计算时，第一设备需要获取前述t2和t3。例如，第二报文包括t2和t3。又例如，第二报文包括t2，第二设备还向第一设备发送第三报文，该第三报文包括t2。当该时间差由第二设备计算时，第二设备需要获取前述t1和t4。例如，第一报文包括t1，第一设备还向第二设备发送第三报文，该第三报文包括t4。又例如，第一设备还向第二设备发 送第三报文和第四报文，该第三报文包括t1，该第四报文包括t4。当该时间差由第三设备计算时，第三设备需要获取前述第一至第四时刻。第一设备可以向第三设备发送携带t1和t4的报文；第二设备可以向第三设备发送携带t2和t3的报文。
在第二种示例中，第二设备向第一设备发送第一报文。第一设备在接收到该第一报文后，向第二设备发送第二报文。相应的，第二设备接收第一设备发送的第二报文。之后，即可基于第一时刻t1、第二时刻t2、第三时刻t3以及第四时刻t4，确定时间差。其中，t1为第二设备向第一设备发送第一报文的时刻，t2为第一设备接收第一报文的时刻，t3为第一设备向第二设备发送第二报文的时刻，t4为第二设备接收第二报文的时刻。在这种情况下，第一设备和第二设备的动作可以分别对应参考前述A2中设备2和设备1的动作。
当该时间差由第一设备计算时，第一设备和第二设备的动作相对于前述第一种示例中时间差由第二设备计算的情况中的动作对调。当该时间差由第二设备计算时，第一设备和第二设备的动作相对于前述第一种示例中时间差由第一设备计算的情况中的动作对调。当该时间差由第三设备计算时，第一设备和第二设备的动作相对于前述第一种示例中时间差由第三设备计算的情况中的动作对调。本申请实施例对此不做赘述。
前述两种示例中，报文中携带的时刻的格式可以参考1588报文中时间戳的格式。例如，在时间精度要求较高的目标网络中，前述第一至第四时刻对应的时间戳的长度均为96比特；在时间精度要求一般的目标网络中，前述第一至第四时刻对应的时间戳的长度均为80比特。
如前述A4所述，传统技术中，无时间同步关系的设备之间无需时间同步，因此两者之间无需传输时间同步相关报文。而在第一种可选实现方式中，为了计算第一设备和第二设备之间的时间差，第一设备和第二设备之间至少需要传输第一报文和第二报文。
传统的1588报文包括消息类型(MsgType)字段，该消息类型字段用于指示1588报文的类型。该消息类型字段携带的不同标识表示不同类型的报文。例如，标识0x00和0x02分别用于指示前述同步报文和延迟请求报文。该消息类型字段的长度通常为4比特。标识0x0E至0x0F为预留标识。
在本申请实施例的一种可选示例中，第一设备和第二设备之间传输的用于计算第一设备和第二设备之间的时间差的目标报文可以复用传统的1588报文。例如，前述第一报文至第四报文分别为同步报文、延迟请求报文、跟随报文和延迟请求响应报文。在本申请实施例的另一种可选示例中，第一设备和第二设备之间传输的用于计算第一设备和第二设备之间的时间差的目标报文可以与传统的1588报文的内容不同。例如，目标报文可以包括消息类型字段。该消息类型字段携带性能检测标识。该性能检测标识指示性能检测标识所在报文用于进行时间同步性能的检测。示例地，该性能检测标识可以为前述任一预留标识，该目标报文的其他字段的结构可以参考1588报文的结构。如此，第一设备和第二设备之间传输的目标报文可以兼容传统的1588报文的格式，减少报文构造的复杂度。示例地，该目标报文包括第一报文和第二报文。可选地，该目标报文还可以包括第三报文和/或第四报文。
在前述第一种可选实现方式中，若采用1588协议来确定时间差。在一种示例中，假设第一设备和第二设备之间的报文传输的时延(即收发时延)是对称相等的，则时间差△t＝[(t4-t1)+(t3-t2)]/2。在另一种示例中，假设第一设备和第二设备之间的报文传输是非对称的，则时间差基于前述t1、t2、t3以及t4，采用加权平均算法计算。例如，时间差△t＝[a(t4-t1)+b(t3-t2)]/2。其中，a和b为预设的权值或者基于预设算法计算得到的权值。本申请实施例对该加权平均算法中的权值不做限定。
通过第一设备和第二设备之间传输报文来获取时间差，可以无需人工参与，实现时间差的快速获取，进而实现时间同步性能的实时检测，有效提高检测效率。
在第二种可选实现方式中，通过GPS仪表获取第一设备与卫星时间的第一时差；通过GPS仪表获取第二设备与卫星时间的第二时差；基于第一时差和第二时差确定第一设备和第二设备之间的时间差。示例地，GPS仪表通过第一设备的测量端口与第一设备建立连接，通过建立的连接获取第一设备的时间，将第一设备的时间与GPS仪表的卫星时间做差得到第一时差。第二时差的获取过程可以参考该第一时差的获取过程。
通过GPS仪表对第一设备和第二设备分别检测来获取时间差，可以通过仅检测GPS仪表与两个设备的时间差来实现时间同步性能的检测。相对于传统方法中逐个检测网络中的设备才能确定网络的时间同步性能是否异常，有效减少了检测的设备数量，从而提高检测效率。
S203、当时间差的绝对值大于预设阈值时，第一设备确定目标网络的时间同步性能异常。执行S205。
第一设备可以先获取预设阈值，再将获取的时间差与该预设阈值进行比较。基于比较结果可以确定目标网络的时间同步性能是否异常。
其中，预设阈值有多种获取方式。在一种示例中，该预设阈值为预先设备的数值。第一设备可以从存储该预设阈值的存储空间读取该预设阈值。在另一种示例中，该预设阈值由第一设备计算得到。第一设备可以获取预设跳数，以及设定时长。将预设跳数与设定时长的乘积确定为预设阈值。该设定时长为一跳的允许同步偏差。示例地，该目标网络包括第一设备和第二设备所在环网，则预设跳数可以为环网中设备的总跳数。
在不同的时间同步精度要求的场景下，该设定时长的长度不同。示例地，在要求高时间同步精度的场景下，该设定时长可以为5纳秒(ns)。在要求普通时间同步精度的场景下，该设定时长可以为30纳秒。
由于第一设备和第二设备直接或间接与同一时钟源设备进行了时间同步。当该时间差的绝对值大于预设阈值时，说明第一设备和第二设备的时间差距较大，两者与时钟源设备的同步效果未达到预期效果，因此第一设备和第二设备所属的目标网络的同步性能异常。
示例地，若第一设备和第二设备均基于1588协议进行时间同步。则第一设备的时间同步效果反映了从第一设备到时钟源设备的各个设备(该各个设备为第一设备到时钟源设备之间的最短路径所经过的设备)的时间同步效果。第二设备的时间同步效果反映了从第二设备到时钟源设备的各个设备(该各个设备为第二设备到时钟源设备之间的最短路径所经过的设备)的时间同步效果。则第一设备和第二设备之间的时间差反映了从第一设备到时钟源设备的各个设备以及从第二设备到时钟源设备的各个设备的整体的时间同步效果。如此，通过目标网络中两个设备的时间差即可反映目标网络中多个设备的时间同步效果。尤其在从第一设备到时钟源设备的设备个数以及从第二设备到时钟源设备的设备个数较多时，通过一个时间差能够反映目标网络的大多数设备的时间同步效果。从而有效提高目标网络的时间同步性能检测效率。当前述时间差的绝对值大于预设阈值时，说明从第一设备到时钟源设备的设备以及从第二设备到时钟源设备的设备中存在至少一个设备的时间同步性能异常。
进一步的，若该目标网络包括环网，第一设备和第二设备为环网上的两个设备。则第一设备的时间同步效果反映了从第一设备到时钟源设备的第一路径(该第一路径为第一设备到时钟源设备之间的最短路径)上的时间同步效果；第二设备的时间同步效果反映了从第二设备到时钟源设备的第二路径(该第二路径为第二设备到时钟源设备之间的最短路径)上的时 间同步效果。第一设备和第二设备之间的时间差既反映了从第一设备到第二设备之间的第三路径(该第三路径为第一设备到第二设备之间的最短路径)上的时间差距，又反映了从第一设备到第二设备之间的第四路径上的时间差距。第四路径由第一路径和第二路径组成。第三路径和第四路径组成整个环网的环路。因此，第一设备和第二设备之间的时间差实际上反映了整个环网的时间同步效果。以图3所示的环网为例，假设第一设备为设备3，第二设备为设备5。则第一路径为设备1、2和3所形成的路径；第二路径是设备1和设备5所形成的路径；第三路径是设备3、4和5所形成的路径；第四路径是设备3、2、1和5所形成的路径。当前述时间差的绝对值大于预设阈值时，说明环网中存在至少一个设备的时间同步性能异常。
若该目标网络包括环网，第一设备和第二设备为环网上的两个相邻的设备，例如叶子设备。则第一设备的时间同步效果反映了从第一设备到时钟源设备的一个半环路径上的时间同步效果；第二设备的时间同步效果反映了从第二设备到时钟源设备的另一个半环路径上的时间同步效果。第一设备和第二设备之间的时间差反映了整个环网的时间同步效果。以图3所示的环网为例，假设第一设备为设备3，第二设备为设备4。则一个半环路径为设备1、2和3所形成的路径；另一个半环路径是设备1、5和4所形成的路径。当前述时间差的绝对值大于预设阈值时，说明环网中存在至少一个设备的时间同步性能异常。
综上所述，本申请实施例通过两个特定的设备(即第一设备和第二设备)之间的时间差反映目标网络中的多个设备甚至整个环网的时间同步效果，从而有效减少了时间同步性能检测的复杂度，提高目标网络的时间同步性能检测效率。
S205、在确定目标网络的时间同步性能异常后，第一设备向第三设备发送异常指示信息。该异常指示信息用于指示目标网络的时间同步性能异常。
在本申请实施例中，第一设备在确定目标网络的时间同步性能异常后，还能够对第三设备进行通知。例如通过向第三设备发送异常指示信息来通知第三设备。在一种可选实现方式中，第三设备为前述管理设备，该异常指示信息可以为管理信息或者告警信息。第三设备在获取该异常指示信息后，可以发出通知信息。该通知信息用于通知工作人员该目标网络的时间同步性能异常。如此，可以便于工作人员及时对目标网络中出现异常的设备进行定位，并对出现异常的设备进行维修或更换。在另一种可选实现方式中，第三设备为目标网络中需要与前述时钟源设备进行时间同步，但还未进行时间同步的设备。第三设备可以在基于异常指示信息确定该目标网络的时间同步性能异常，禁止与时钟源设备进行时间同步。以避免同步后的时间无效，降低目标网络的时间同步性能异常对第三设备的影响。例如，当第一设备和第二设备为环网上非相邻的设备时，第三设备为环网上第一设备和第二设备之间的设备。在又一种可选实现方式中，第三设备为预先指定的设备。例如，其为工作人员的移动终端。工作人员可以通过该第三设备快速便捷地确定目标网络的时间同步性能异常，从而及时进行目标网络的维护。
S204、当时间差的绝对值不大于预设阈值时，第一设备确定目标网络的时间同步性能正常。
参考S203,若第一设备和第二设备均基于1588协议进行时间同步。则第一设备和第二设备之间的时间差反映了从第一设备到时钟源设备的各个设备以及从第二设备到时钟源设备的各个设备的整体的时间同步效果。当前述时间差的绝对值不大于预设阈值时，说明从第一设备到时钟源设备的设备以及从第二设备到时钟源设备的时间同步性能均正常。进一步的，若该目标网络包括环网，第一设备和第二设备为环网上的两个设备。则第一设备和第二设备之 间的时间差反映了整个环网的时间同步效果。前述时间差的绝对值不大于预设阈值时，说明环网上的设备的时间同步性能均正常。
第一设备在确定目标网络的时间同步性能正常后，可以停止动作。也可以向第三设备发送正常指示信息，该正常指示信息用于指示目标网络的时间同步性能正常。
值得说明的是，前述S201至S205可以根据目标网络的时间同步以及检测需要来周期性执行。也可以在满足第一指定条件后执行。例如在目标网络初始部署后执行；或者，在管理设备向目标网络发送指示进行时间同步的触发指令后执行。
或者，在前述S201执行后，S202至S205可以根据目标网络的检测需要周期性执行，也可以在满足第二指定条件后执行。例如在目标网络每次时间同步后执行；或者，管理设备向目标网络中的设备发送指示进行性能异常检测的触发指令后执行。
并且，本申请实施例提供的检测时间同步性能的方法步骤的先后顺序可以进行适当调整，步骤也可以根据情况进行相应增减。例如，前述S205可以不执行。任何熟悉本技术领域的技术人员在本申请揭露的技术范围内，可轻易想到变化的方法，都应涵盖在本申请的保护范围之内，因此不再赘述。
综上所述，本申请实施例中，在第一设备和第二设备均完成时间同步，且第一设备与第二设备无时间同步关系的情况下，基于第一设备和第二设备的时间差来确定目标网络的时间同步性能是否异常，从而快速地确定目标网络的时间同步性能是否异常。并且该检测时间同步性能的方法无需采用额外的GPS仪表逐一对网络中的设备进行检测，有效提高了目标网络的时间同步性能的检测效率。进一步的，当基于第一设备和第二设备之间传输的报文来获取时间差时，还能实现目标网络的时间同步性能的实时检测，降低检测时延以及检测的成本。
图1以多个通信设备102组成一个环网为例对检测时间同步性能的方法所涉及的应用环境进行说明。实际实现时，该检测时间同步性能的方法还可以应用于其他类型的网络中。图4是本申请实施例提供的一种检测时间同步性能的方法所涉及的另一种应用环境示意图。该应用环境中，时间同步系统包括的多个通信设备102组成网格网络(也称mesh网络或mesh组网)。图4假设该多个通信设备102包括通信设备1021至1025。该网格网络可以根据时间同步需求划分为多个环网，针对每个环网的检测时间同步性能的方法的流程可以参考前述图2所提供的检测时间同步性能的方法的流程。示例地，图4中的网格网络可以划分为3个环网，分别为通信设备1021、1022、1023和1024组成的第一环网，通信设备1023、1024和1025组成的第二环网，以及通信设备1021、1024、1025、1023和1022组成的第三环网。网格网络划分环网的方式可以预先配置，也可以由管理设备101指示。
图2以前述检测时间同步性能的方法由第一设备执行为例进行说明。在实际实现时，该检测时间同步性能的方法还可以由第二设备执行，或者由第三设备执行。当该检测时间同步性能的方法由第二设备执行时，第一设备和第二设备的动作相对于前述S202至S205进行对调。图5是本申请实施例提供的另一种检测时间同步性能的方法的流程示意图。图5假设检测时间同步性能的方法由第三设备执行。该方法可以应用于图1或图4所示的应用环境中。如图5所示，该方法包括：
S301、目标网络中的设备进行时间同步。
S302、第三设备获取第一设备和第二设备之间的时间差。执行S303或S304。
第三设备可以在确定第一设备以及第二设备均完成时间同步，且第一设备与第二设备无时间同步关系后，再获取第一设备和第二设备之间的时间差。
在一种可选示例中，第一设备和第二设备在分别完成时间同步后，向第三设备发送第一通信报文。该第一通知报文用于指示对应的设备完成时间同步。第三设备在接收到第一设备和第二设备发送的第一通知报文后，确定第一设备以及第二设备分别完成时间同步。
在第二种可选示例中，第一设备可以在确定自身以及第二设备均完成时间同步后，向第三设备发送第二通信报文。或者，第二设备在确定自身以及第一设备均完成时间同步后，向第三设备发送第二通信报文。该第二通知报文用于指示第一设备和第二设备分别完成时间同步。第三设备在接收到第二通知报文后，确定第一设备以及第二设备分别完成时间同步。
第三设备确定第一设备与第二设备无时间同步关系的方式可以包括以下两种方式。
在第一种方式中，若第一设备的时间同步优先级与第二设备的时间同步优先级相同，且均为第一优先级，则确定第一设备与第二设备之间无时间同步关系。
在一种可选示例中，第一设备或第二设备可以在确定第一设备与第二设备之间无时间同步关系后，向第三设备发送第三通信报文。该第三通信报文用于指示第一设备与第二设备之间无时间同步关系。第三设备在接收到第三通知报文后，确定第一设备与第二设备之间无时间同步关系。其中，第一设备或第二设备确定第一设备与第二设备之间无时间同步关系的过程可以参考S202中的第一种方式。
在另一种可选示例中，第一设备和第二设备在完成时间同步后，向第三设备发送第四通信报文。该第四通知报文用于指示对应的设备的时间同步优先级。第三设备在接收到第一设备和第二设备发送的第四通知报文后，基于报文中携带的时间同步优先级，确定第一设备的时间同步优先级与第二设备的时间同步优先级相同，且均为第一优先级。相应地，确定第一设备与第二设备之间无时间同步关系。
在第二种方式中，若第一设备与第二设备为预设的一对无需时间同步的设备，则确定第一设备与第二设备之间无时间同步关系。
示例地，通过第三设备可以对无需时间同步的一对设备进行设置。该一对设备之间无需进行时间同步，也即是解除了时间同步关系。第三设备检测预先设置的信息。在检测到第一设备与第二设备为预设的一对无需时间同步的设备，则确定第一设备与第二设备之间无时间同步关系。
第三设备获取时间差的方式可以参考前述S202中获取第一设备和第二设备之间的时间差的两种可选实现方式。需要说明的是，与前述第一种可选实现方式不同的是，若时间差由第一设备计算，则第一设备完成时间差计算后，将该时间差发送至第三设备。若时间差由第二设备计算，则第二设备完成时间差计算后，将该时间差发送至第三设备。若时间差由第三设备计算，则第三设备完成时间差计算后，可以无需将该时间差发送至第一设备。
S303、当时间差的绝对值大于预设阈值时，第三设备确定目标网络的时间同步性能异常。
S304、当时间差的绝对值不大于预设阈值时，第三设备确定目标网络的时间同步性能正常。
前述S301、S303和S304中的过程可以分别对应参考前述S201、S203和S204中的过程。本申请实施例对此不做赘述。值得说明的是，前述S301至S304可以根据目标网络的时间同步以及检测需要周期性执行，也可以在满足前述第一指定条件后执行。或者，在前述S301执行后，S302至S304可以根据目标网络的检测需要周期性执行，也可以在满足前述第二指定条件后执行。
综上所述，本申请实施例中，在第一设备和第二设备均完成时间同步，且第一设备与第 二设备无时间同步关系的情况下，基于第一设备和第二设备的时间差来确定目标网络的时间同步性能是否异常，从而快速地确定目标网络的时间同步性能是否异常。并且该检测时间同步性能的方法无需采用额外的GPS仪表逐一对网络中的设备进行检测，有效提高了目标网络的时间同步性能的检测效率。此外，装置实施例的有益效果和方法对应步骤的有益效果类似，下面不再赘述。
图6是本申请实施例提供的一种检测时间同步性能的装置40的结构示意图。该装置40包括：获取模块401和第一确定模块402。其中，获取模块401，用于获取第一设备和第二设备之间的时间差。该第一设备处于与时钟源设备完成时间同步的状态。该第二设备处于与该时钟源设备完成时间同步的状态。该第一设备与第二设备之间无时间同步关系。第一确定模块402，用于当该时间差的绝对值大于预设阈值时，确定目标网络的时间同步性能异常。该目标网络为该第一设备和该第二设备所属网络。
可选地，该获取模块401，用于：基于第一时刻、第二时刻、第三时刻以及第四时刻，确定该时间差。其中，该第一时刻为该第一设备向该第二设备发送第一报文的时刻。该第二时刻为该第二设备接收该第一报文的时刻。该第三时刻为该第二设备向该第一设备发送该第二报文的时刻。该第四时刻为该第一设备接收该第二报文的时刻。
示例地，该第一设备包括该装置40。该装置40还包括：第一发送模块和接收模块。该第一发送模块用于向该第二设备发送该第一报文；该接收模块，用于接收该第二设备发送的该第二报文。其中，该第一报文和该第二报文均包括消息类型字段，该消息类型字段携带性能检测标识，该性能检测标识指示该性能检测标识所在报文用于进行时间同步性能的检测。
在一种可选实现方式中，该装置40还包括：第二确定模块。该第二确定模块用于若该第一设备的时间同步优先级与该第二设备的时间同步优先级相同，且均为第一优先级，则确定该第一设备与第二设备之间无时间同步关系。在另一种可选实现方式中，该装置40还包括：第三确定模块。该第三确定模块用于若该第一设备与该第二设备均为预设的无需时间同步的设备，则确定该第一设备与该第二设备之间无时间同步关系。
可选地，该装置40还包括：第二发送模块。该第二发送模块用于在确定目标网络的时间同步性能异常后，向第三设备发送异常指示信息。该异常指示信息用于指示该目标网络的时间同步性能异常。
在一种可选实现方式中，该第一设备为该目标网络中与该第二设备相邻的设备。可选地，该目标网络中的设备可以基于1588协议完成时间同步。
示例地，该目标网络包括环网，该环网包括该第一设备和该第二设备，该预设阈值为该环网中设备的总跳数与设定时长的乘积，该设定时长为一跳的允许同步偏差。
本申请实施例提供一种时间同步系统，包括：包括至少三个设备的目标网络，该目标网络包括如前述任一实施例所述的时间同步性能确定装置。示例地，该时间同步系统可以为图1或图4所示的时间同步系统。可选地，该目标网络包括一个或多个环网。
图7是本申请实施例提供的一种设备50的结构示意图。如图7所示，该设备50包括：处理芯片501及通信端口502。图7所示的设备50可以应用于时间同步系统的第一设备、第二设备或第三设备中。该处理芯片501可以为现场可编程逻辑门阵列(Field Programmable Gate Array，FPGA)或为集成电路(Application Specific Integrated Circuit，ASIC)芯片。该处理芯片501用于执行前述实施例提供的检测时间同步性能的方法。该通信端口502用于供处理芯片501与其他装置进行通信。例如，该通信端口502为光收发机，用于供处理芯片501通过 光纤与其他设备进行通信。
在一种可选实现方式中，该处理芯片501包括缓存结构，如FPGA或ASIC芯片内部的存储结构。在另一种可选实现方式中，该设备501还包括：存储器。例如，该存储器为快闪存储器。
在上述实施例中，可以全部或部分地通过软件、硬件、固件或者其任意组合来实现。当使用软件实现时，可以全部或部分地以计算机程序产品的形式实现，所述计算机程序产品包括一个或多个计算机指令。在计算机上加载和执行所述计算机程序指令时，全部或部分地产生按照本申请实施例所述的流程或功能。所述计算机可以是通用计算机、计算机网络、或者其他可编程装置。所述计算机指令可以存储在计算机的可读存储介质中，或者从一个计算机可读存储介质向另一个计算机可读存储介质传输，例如，所述计算机指令可以从一个网站站点、计算机、服务器或数据中心通过有线(例如同轴电缆、光纤、数字用户线)或无线(例如红外、无线、微波等)方式向另一个网站站点、计算机、服务器或数据中心传输。所述计算机可读存储介质可以是计算机能够存取的任何可用介质或者包含一个或多个可用介质集成的服务器、数据中心等数据存储设备。所述可用介质可以是磁性介质(例如，软盘、硬盘、磁带)、光介质，或者半导体介质(例如固态硬盘)等。
在本申请中，术语“第一”、“第二”和“第三”仅用于描述目的，而不能理解为指示或暗示相对重要性。术语“至少一个”表示1个或多个，术语“多个”指两个或两个以上，除非另有明确的限定。A参考B，指的是A与B相同或者A为B的简单变形。
需要说明的是：上述实施例提供的时间同步系统在执行该检测时间同步性能的方法时，仅以上述各功能模块的划分进行举例说明，实际应用中，可以根据需要而将上述功能分配由不同的功能模块完成，即将设备的内部结构划分成不同的功能模块，以完成以上描述的全部或者部分功能。另外，上述实施例提供的时间同步系统与检测时间同步性能的方法实施例属于同一构思，其具体实现过程详见方法实施例，这里不再赘述。
本领域普通技术人员可以理解实现上述实施例的全部或部分步骤可以通过硬件来完成，也可以通过程序来指令相关的硬件完成，所述的程序可以存储于一种计算机可读存储介质中，上述提到的存储介质可以是只读存储器，磁盘或光盘等。
以上所述仅为本申请的可选实施例，并不用以限制本申请，凡在本申请的精神和原则之内，所作的任何修改、等同替换、改进等，均应包含在本申请的保护范围之内。

Claims (22)

  1. 一种检测时间同步性能的方法，其特征在于，所述方法包括：
    获取第一设备和第二设备之间的时间差，所述第一设备处于与时钟源设备完成时间同步的状态，所述第二设备处于与所述时钟源设备完成时间同步的状态，所述第一设备与第二设备之间无时间同步关系；
    当所述时间差的绝对值大于预设阈值时，确定目标网络的时间同步性能异常，所述目标网络为所述第一设备和所述第二设备所属网络。
  2. 根据权利要求1所述的方法，其特征在于，所述方法还包括：
    若所述第一设备的时间同步优先级与所述第二设备的时间同步优先级相同，且均为第一优先级，则确定所述第一设备与第二设备之间无时间同步关系。
  3. 根据权利要求1所述的方法，其特征在于，所述方法还包括：
    若所述第一设备与所述第二设备为预设的一对无需时间同步的设备，则确定所述第一设备与所述第二设备之间无时间同步关系。
  4. 根据权利要求1至3任一所述的方法，其特征在于，所述获取所述第一设备和所述第二设备之间的时间差，包括：
    基于第一时刻、第二时刻、第三时刻以及第四时刻，确定所述时间差；
    其中，所述第一时刻为所述第一设备向所述第二设备发送第一报文的时刻，所述第二时刻为所述第二设备接收所述第一报文的时刻，所述第三时刻为所述第二设备向所述第一设备发送所述第二报文的时刻，所述第四时刻为所述第一设备接收所述第二报文的时刻。
  5. 根据权利要求4所述的方法，其特征在于，所述方法由所述第一设备执行，所述方法还包括：
    向所述第二设备发送所述第一报文；
    接收所述第二设备发送的所述第二报文。
  6. 根据权利要求4或5所述的方法，其特征在于，所述第一报文和所述第二报文均包括消息类型字段，所述消息类型字段携带性能检测标识，所述性能检测标识指示所述性能检测标识所在报文用于进行时间同步性能的检测。
  7. 根据权利要求4至6任一所述的方法，其特征在于，所述方法还包括：
    在确定目标网络的时间同步性能异常后，向第三设备发送异常指示信息，所述异常指示信息用于指示所述目标网络的时间同步性能异常。
  8. 根据权利要求1至7任一所述的方法，其特征在于，所述第一设备为所述目标网络中与所述第二设备相邻的设备。
  9. 根据权利要求1至8任一所述的方法，其特征在于，所述目标网络包括环网，所述环网包括所述第一设备和所述第二设备，所述预设阈值为所述环网中设备的总跳数与设定时长的乘积，所述设定时长为一跳的允许同步偏差。
  10. 根据权利要求1至9任一所述的方法，其特征在于，所述目标网络中的设备基于1588协议完成时间同步。
  11. 一种检测时间同步性能的装置，其特征在于，所述装置包括：
    获取模块，用于获取第一设备和第二设备之间的时间差，所述第一设备处于与时钟源设备完成时间同步的状态，所述第二设备处于与所述时钟源设备完成时间同步的状态，所述第 一设备与第二设备之间无时间同步关系；
    第一确定模块，用于当所述时间差的绝对值大于预设阈值时，确定目标网络的时间同步性能异常，所述目标网络为所述第一设备和所述第二设备所属网络。
  12. 根据权利要求11所述的装置，其特征在于，所述装置还包括：
    第二确定模块，用于若所述第一设备的时间同步优先级与所述第二设备的时间同步优先级相同，且均为第一优先级，则确定所述第一设备与第二设备之间无时间同步关系。
  13. 根据权利要求11所述的装置，其特征在于，所述装置还包括：
    第三确定模块，用于若所述第一设备与所述第二设备为预设的一对无需时间同步的设备，则确定所述第一设备与所述第二设备之间无时间同步关系。
  14. 根据权利要求11至13任一所述的装置，其特征在于，所述获取模块，用于：
    基于第一时刻、第二时刻、第三时刻以及第四时刻，确定所述时间差；
    其中，所述第一时刻为所述第一设备向所述第二设备发送第一报文的时刻，所述第二时刻为所述第二设备接收所述第一报文的时刻，所述第三时刻为所述第二设备向所述第一设备发送所述第二报文的时刻，所述第四时刻为所述第一设备接收所述第二报文的时刻。
  15. 根据权利要求14所述的装置，其特征在于，所述第一设备包括所述装置，所述装置还包括：
    第一发送模块，用于向所述第二设备发送所述第一报文；
    接收模块，用于接收所述第二设备发送的所述第二报文。
  16. 根据权利要求14或15所述的装置，其特征在于，所述第一报文和所述第二报文均包括消息类型字段，所述消息类型字段携带性能检测标识，所述性能检测标识指示所述性能检测标识所在报文用于进行时间同步性能的检测。
  17. 根据权利要求14至16任一所述的装置，其特征在于，所述装置还包括：
    第二发送模块，用于在确定目标网络的时间同步性能异常后，向第三设备发送异常指示信息，所述异常指示信息用于指示所述目标网络的时间同步性能异常。
  18. 根据权利要求11至17任一所述的装置，其特征在于，所述第一设备为所述目标网络中与所述第二设备相邻的设备。
  19. 根据权利要求11至18任一所述的装置，其特征在于，所述目标网络包括环网，所述环网包括所述第一设备和所述第二设备，所述预设阈值为所述环网中设备的总跳数与设定时长的乘积，所述设定时长为一跳的允许同步偏差。
  20. 根据权利要求11至19任一所述的装置，其特征在于，所述目标网络中的设备基于1588协议完成时间同步。
  21. 一种时间同步系统，其特征在于，包括：包括至少三个设备的目标网络，所述目标网络包括如权利要求11至20任一所述的时间同步性能确定装置。
  22. 一种设备，其特征在于，所述设备包括：
    处理芯片和通信端口，所述处理芯片用于执行权利要求1至10任一所述的检测时间同步性能的方法；
    所述通信端口用于供所述处理芯片与其他设备进行通信。
PCT/CN2021/143446 2021-01-13 2021-12-30 检测时间同步性能的方法、装置及系统 WO2022151993A1 (zh)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN202110042241.2A CN114765586A (zh) 2021-01-13 2021-01-13 检测时间同步性能的方法、装置及系统
CN202110042241.2 2021-01-13

Publications (1)

Publication Number Publication Date
WO2022151993A1 true WO2022151993A1 (zh) 2022-07-21

Family

ID=82364500

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/CN2021/143446 WO2022151993A1 (zh) 2021-01-13 2021-12-30 检测时间同步性能的方法、装置及系统

Country Status (2)

Country Link
CN (1) CN114765586A (zh)
WO (1) WO2022151993A1 (zh)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113630640B (zh) * 2021-07-27 2023-11-17 中央广播电视总台 一种媒体设备流量精度分析方法、装置及可读存储介质
CN116321399A (zh) * 2022-12-14 2023-06-23 海尔优家智能科技（北京）有限公司 用于无线网状Mesh网络的同步方法及装置、电子设备

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1354925A (zh) * 1999-02-26 2002-06-19 艾利森电话股份有限公司 蜂窝通信网中利用共路信令的时间管理
US20070274349A1 (en) * 2006-02-22 2007-11-29 Yokogawa Electric Corporation Detector and method for detecting abnormality in time synchronization
CN102957545A (zh) * 2011-08-17 2013-03-06 中兴通讯股份有限公司 同步网络时钟的维护方法及装置
CN103684648A (zh) * 2012-09-21 2014-03-26 中兴通讯股份有限公司 一种环网节点时钟有效性判定方法及装置
CN106487467A (zh) * 2015-08-26 2017-03-08 中兴通讯股份有限公司 一种时间同步偏差检测方法和装置

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101145896B (zh) * 2007-09-17 2010-11-03 浙江中控技术股份有限公司 实现控制站之间时钟同步的控制系统和方法
CN109586879B (zh) * 2017-09-28 2023-06-20 北京三星通信技术研究有限公司 多载波旁路通信同步源选择的方法及设备
CN110133998B (zh) * 2019-05-17 2021-04-16 长沙理工大学 一种防持续时间同步攻击的方法
CN111865466B (zh) * 2020-07-10 2023-11-03 润电能源科学技术有限公司 时间同步方法、装置、被授时设备和存储介质

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1354925A (zh) * 1999-02-26 2002-06-19 艾利森电话股份有限公司 蜂窝通信网中利用共路信令的时间管理
US20070274349A1 (en) * 2006-02-22 2007-11-29 Yokogawa Electric Corporation Detector and method for detecting abnormality in time synchronization
CN102957545A (zh) * 2011-08-17 2013-03-06 中兴通讯股份有限公司 同步网络时钟的维护方法及装置
CN103684648A (zh) * 2012-09-21 2014-03-26 中兴通讯股份有限公司 一种环网节点时钟有效性判定方法及装置
CN106487467A (zh) * 2015-08-26 2017-03-08 中兴通讯股份有限公司 一种时间同步偏差检测方法和装置

Also Published As

Publication number Publication date
CN114765586A (zh) 2022-07-19

Similar Documents

Publication Publication Date Title
US10862601B1 (en) Bridges including physical layer devices for indicating transmission times of synchronization frames by modifying previously generated corresponding follow up frames
US11503560B2 (en) Time synchronization offset adjustment method and apparatus, terminal, and access layer device
WO2022151993A1 (zh) 检测时间同步性能的方法、装置及系统
US9698926B2 (en) Distributed two-step clock
US8509215B2 (en) Delay management for distributed communications networks
JP5671619B2 (ja) 遅延非対称を補正するための方法
US20130227008A1 (en) Clock synchronization based on predefined grandmaster
US9813175B2 (en) Method for detecting timing references affected by a change in path delay asymmetry between nodes in a communication network
US9288002B2 (en) Method for monitoring and managing data networks
WO2017133478A1 (zh) 用于时间同步的方法和时钟
US9955447B2 (en) Clock synchronization method, mobile network system, network controller and network switch
EP2541815A1 (en) Clock synchronization network
WO2021042789A1 (zh) 用于实现时钟源选取的方法、装置、系统及存储介质
US9912693B1 (en) Identification of malicious precise time protocol (PTP) nodes
CN113424466B (zh) 时钟同步的方法和装置
WO2016002367A1 (ja) 通信システム、通信方法、及び、通信プログラム
WO2013107174A1 (zh) 光纤对称性检测方法及设备
CN116865898A (zh) 基于多时钟域的时钟冗余系统和时钟冗余的实现方法
CN114938345B (zh) 一种链路发现方法、装置及存储介质
US10334539B2 (en) Metered interface
WO2022127924A1 (zh) 选择时钟源的方法及装置
KR20100048124A (ko) 근거리 통신망에서의 시간 동기화 방법
CN117278190B (zh) 时间同步单元、方法、芯片架构、网络设备及介质
US20160309435A1 (en) Segment synchronization method for network based display
WO2023029669A1 (zh) 一种时间同步的监控方法

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 21919180

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 21919180

Country of ref document: EP

Kind code of ref document: A1