WO2021238724A1

WO2021238724A1 - Method and apparatus for transmitting timestamp information, and device and storage medium

Info

Publication number: WO2021238724A1
Application number: PCT/CN2021/094399
Authority: WO
Inventors: 高睿
Original assignee: 中兴通讯股份有限公司
Priority date: 2020-05-29
Filing date: 2021-05-18
Publication date: 2021-12-02
Also published as: CN113746587A; KR20230018469A

Abstract

Disclosed are a method and apparatus for transmitting timestamp information, and a device and a storage medium. The method comprises: inserting an OTUw-RS frame header into a parallel data stream, and generating a frame header pulse; determining sending timestamp information according to the frame header pulse and a sampling clock; and sending the sending timestamp information to a receiving end by means of a timestamp data frame.

Description

Time stamp information transmission method, device, equipment and storage medium

cross reference

This application is filed based on the Chinese patent application with the application number "202010479891.9" and the filing date on May 29, 2020, and claims the priority of the Chinese patent application. The entire content of the Chinese patent application is hereby incorporated into this by way of introduction. Application.

Technical field

This application relates to the technical field of communication networks, and in particular to a method, device, device, and storage medium for transmitting time stamp information.

Background technique

Communication networks have high requirements for time synchronization between devices. For example, when switching base stations during wireless communication, when the time error between the base stations of the base station is not within a certain range, the communication will be dropped. Optical Transmission Unit (Optical Transport Unit with AM/CWM and Reed-solomon (528, 514) 10 or (544, 514) 10 FEC) based on (528, 514) 10 or (544, 514) 10 forward error correction coding in communication networks , OTUw-RS) protocol Optical Transport Network (Optical Transport Network, OTN) optical transmission equipment has broad application scenarios in the fronthaul network. By using KR4/KP4 encoding respectively, it can provide two bit rates of 25G or 50G. The OTN optical transmission equipment based on the OTUw-RS protocol better meets the requirements of low latency, low cost, high reliability and high bandwidth in the fronthaul network.

However, the OTUw-RS protocol does not stipulate how the equipment collects time stamp information and the transmission of time stamp information. If the equipment is installed with a global positioning system (Global Positioning System, GPS) signal receiving device, it is received by the GPS signal receiving device. The time synchronization signal sent by the satellite realizes the time synchronization between the devices, which will increase the construction cost and threaten the safety of the OTN optical transmission equipment based on the OTUw-RS protocol.

Summary of the invention

The embodiment of the application provides a time stamp information transmission method, which is applied to the sending end. The method includes: inserting an OTUw-RS frame header into a parallel data stream and generating a frame header pulse; determining according to the frame header pulse and the sampling clock Sending time stamp information; sending the sending time stamp information to the receiving end through a time stamp data frame.

The embodiment of the application provides a method for transmitting time stamp information, using the receiving end, the method includes: searching for the OTUw-RS frame header in a parallel data stream, and generating a frame header pulse; determining according to the frame header pulse and the sampling clock Receive timestamp information; obtain the sending timestamp information sent by the sender through the timestamp data frame.

The embodiment of the application provides a time stamp information transmission device, which is applied to the sending end, and the device includes: a first pulse module for inserting an OTUw-RS frame header into a parallel data stream and generating a frame header pulse; a time determination module , Used to determine the sending time stamp information according to the frame header pulse and the sampling clock; the information sending module, used to send the sending time stamp information to the receiving end through a time stamp data frame.

The embodiment of the application provides a time stamp information transmission device, which is applied to the receiving end, and the device includes: a second pulse module for searching for the OTUw-RS frame header in the parallel data stream and generating the frame header pulse; receiving time The module determines the receiving time stamp information according to the frame header pulse and the sampling clock; the sending time module is used to obtain the sending time stamp information sent by the sending end through the time stamped data frame.

An embodiment of the present application also provides a device, which includes: one or more processors; a memory, configured to store one or more programs, when the one or more programs are used by the one or more processors Execution, so that the one or more processors implement the time stamp information transmission method as described in any of the embodiments of the present application.

The embodiment of the present application also provides a computer-readable storage medium on which a computer program is stored, and when the program is executed by a processor, the method for transmitting time stamp information as described in any of the embodiments of the present application is implemented.

Description of the drawings

FIG. 1 is a flowchart of a method for transmitting time stamp information according to an embodiment of the present application;

FIG. 2 is a flowchart of another method for transmitting time stamp information according to an embodiment of the present application;

FIG. 3 is a flowchart of another method for transmitting time stamp information according to an embodiment of the present application;

FIG. 4 is a flowchart of yet another method for transmitting time stamp information according to an embodiment of the present application;

FIG. 5 is an exemplary diagram of a method for transmitting time stamp information according to an embodiment of the present application;

FIG. 6 is a schematic structural diagram of a time stamp information transmission device provided by an embodiment of the present application;

FIG. 7 is a schematic structural diagram of another apparatus for transmitting time stamp information according to an embodiment of the present application;

FIG. 8 is a schematic structural diagram of a device provided by an embodiment of the present application;

FIG. 9 is a diagram of an implementation example of an optical transmission device provided by an embodiment of the present application;

FIG. 10 is an example diagram of time synchronization provided by an embodiment of the present application.

Detailed ways

In order to make the purpose, technical solutions, and advantages of the present application clearer, the embodiments of the present application will be described in detail below in conjunction with the accompanying drawings. It should be noted that the embodiments in this application and the features in the embodiments can be combined with each other arbitrarily if there is no conflict. OTN optical transmission equipment based on the OTUw-RS protocol has a wide range of application scenarios in the fronthaul network due to the characteristics of low latency, low cost, high reliability and high bandwidth, but because the OTUw-RS protocol does not determine and send the time stamp information The OTN optical transmission network using the OTUw-RS protocol cannot perform time synchronization, which causes the problem of large time errors between devices. The existence of the above problems has a non-negligible impact on the dimensionality of the fronthaul network. This application The embodiment uses the frame header of the OTUw-RS protocol to collect the time stamp information and send the time stamp information to the opposite device, thereby realizing the time synchronization of the OTN optical transmission network.

The embodiments of the application provide a method, device, device, and storage medium for transmitting time stamp information, so as to realize the determination and transmission of time stamp information of OTN optical transmission equipment based on the OTUw-RS protocol, and improve the accuracy of time synchronization of OTN equipment .

Figure 1 is a flow chart of a method for transmitting time stamp information provided by an embodiment of the present application. The embodiment of the present application is applicable to the case of transmitting time stamp information on an OTN optical transmission network using the OTUw-RS protocol in a fronthaul network. The time stamp information transmission device in the embodiment of the application is implemented. The device can be implemented by software and/or hardware. The device is generally integrated at the transmitting end of the OTN optical transmission network. This method for transmitting time stamp information specifically includes the following steps.

Step 110: Insert the OTUw-RS frame header into the parallel data stream, and generate frame header pulses.

Among them, the OTUw-RS frame header is a message frame header that meets the requirements of the OTUw-RS protocol, and can include AM and CWM frame headers. The parallel data stream can be the carrier of information transmission in the OTN optical transmission network, and the parallel data stream can be of different wavelengths. Adjusted light signal. The frame header pulse can be a pulse signal generated after the OTUw-RS frame header is inserted into the parallel data stream, and it can indicate that the OTUw-RS frame header is sent through parallel data.

Specifically, construct the message frame header conforming to the OTUw-RS protocol format, insert the constructed OTUw-RS frame header into the parallel data stream and send it to the receiving end, and monitor the frame header pulse corresponding to the OTUw-RS frame header. The pulse can be generated at the moment when the OTUw-RS frame header is sent.

Step 120: Determine sending time stamp information according to the frame header pulse and the sampling clock.

Among them, the sampling clock is a timing clock with a preset frequency in the OTN optical transmission network equipment. The sampling clock can collect the frame header pulse signal according to the clock edge within a clock cycle, and the collected frame header pulse signal can correspond to different Clock time.

In the embodiment of the present application, the sending time stamp information may indicate the sending time of the OTUw-RS frame header, and the sending time stamp information specifically refers to the total seconds from 00: 00: 00 on January 1, 1970, Greenwich Mean Time. According to the clock edge of the sampling clock, the pulse signal of the frame header pulse is collected, and the time when the signal is collected is locked. The time stamp information can be determined by the collected time, for example, the average value of all locked times is determined as the sending time Stamp information or select the minimum time as the sending time stamp information, and each collected time can be used as the sending time stamp information.

Step 130: Send the sending time stamp information to the receiving end through a time stamp data frame.

Among them, the time stamp data frame is a data frame encapsulated with sending time stamp information. The following table shows the structure data structure of a time stamp data frame. The time stamp data frame can have a start bit, frame header synchronization byte 1, The frame header is composed of synchronization byte 2, time stamp byte, check byte and stop bit.

Time stamp data frame example table

起始位Start bit	帧头同步字节1Frame header sync byte 1	帧头同步字节2Frame header sync byte 2	时戳字节Timestamp byte	校验字节Check byte	停止位Stop bit
8比特8-bit	8比特8-bit	8比特8-bit	80比特80 bit	8比特8-bit	1比特1 bit

In the embodiment of this application, the sending time stamp information is encapsulated into the time stamp byte of the time stamp data frame, and other constituent fields of the time stamp data frame are generated. The encapsulated time stamp data frame can be sent to OTN optical transmission through parallel data. The receiving end of the network can understand that the number of timestamp data frames sent by the sending end can be one or more according to the determined number of sending timestamp information.

In the embodiment of the application, by inserting the OTUw-RS frame header into the parallel data stream, and generating the frame header pulse, the transmission time stamp is determined by the sampling clock and the frame header pulse, and the transmission time stamp information is sent to the receiving end through the time stamp data frame. The transmission of time stamp information in the OTN optical transmission network improves the accuracy of the time stamp information and can reduce the time error between different devices.

FIG. 2 is a flowchart of another method for transmitting time stamp information provided by an embodiment of the present application. The embodiment of the present application is based on the above-mentioned application embodiment, and determines the frame headers at the rising and falling edges of the acquisition clock respectively. Pulse transmission time stamp information, and determine the transmission format of the transmission time stamp information according to the high-precision time synchronization protocol package. Referring to FIG. 2, the time stamp information transmission method provided in the embodiment of the present application specifically includes the following steps.

Step 210: Insert the OTUw-RS frame header into the parallel data stream, and generate a frame header pulse.

Step 220: Collect the frame header pulses respectively according to the rising edge and the falling edge of the sampling clock, and lock the timer time of the sampling clock.

The sampling clock may include multiple clock cycles. In each clock cycle, the rising position of the level signal of the sampling clock can be used as a rising edge, and the falling position of the level signal can be used as a falling edge.

In the embodiment of the present application, the frame header pulses are collected twice in each clock cycle of the sampling clock, and the corresponding frame header pulses can be collected on the rising and falling edges of the sampling clock respectively, and the rising and falling edges can correspond to The timer time is determined as the timer time when the frame header pulse is collected. In this embodiment, since the sampling clock has multiple clock cycles, the time when the pulse signal is present in the frame header pulse locks multiple timer times through the rising and falling edges of the sampling clock. The more clock cycles of the sampling clock, the more The more the timer time is, and accordingly, the higher the accuracy of sending the time stamp information.

In one embodiment, based on the above-mentioned application embodiment, the frequency of the sampling clock is 1 GHz, and the step of the sampling clock is 1 nanosecond.

In an exemplary embodiment, in order to improve the accuracy of the time, the frequency of the sampling clock is set to 1 GHz, and the corresponding step is 1 nanosecond. Then the sampling clock can have a rising edge and a falling within 1 nanosecond. Correspondingly, the length of one clock cycle of the sampling clock can be 1 nanosecond.

Step 230: Determine the minimum value of the timer times corresponding to the same clock cycle as the sending time stamp information.

In the embodiment of this application, the acquisition clock includes multiple clock cycles, and the rising edge and falling edge of each clock cycle have corresponding timer times. The smaller one can be selected among the two timer times belonging to the same clock cycle. The timer time is used as the sending time stamp information.

Step 240: Encapsulate the sending time stamp information into a high-precision time synchronization protocol packet.

Among them, the high-precision time synchronization protocol (Precision Time Protocol, PTP) packet is a high-precision time data packet, and the time accuracy can reach sub-microsecond precision.

Specifically, the transmission time stamp information is encapsulated according to the format of a high-precision time synchronization protocol packet to realize the transmission of high-precision time information.

Step 250: Insert the high-precision time synchronization protocol packet into the overhead reserved field of the time stamp data frame.

In the embodiment of the present application, the overhead reserved field may be a reserved field specified by the OTUw-RS protocol, and the encapsulated high-precision time synchronization protocol packet may be inserted into the corresponding position.

Step 260: Send the time stamp data frame to the receiving end before the next frame header pulse.

Specifically, the time stamp data frame transmitted in the parallel data stream corresponds to the OTUw-RS frame header. After an OTUw-RS frame header is sent, the time stamp data frame corresponding to the frame header needs to be sent before the next OTUw-RS frame header is sent Sent to the receiving end.

In the embodiment of the application, by inserting the OTUw-RS frame header into the parallel data stream, and generating the frame header pulse, the frame header pulse lock corresponding timer time is collected through the rising edge and the falling edge of the sampling clock respectively, which will correspond to the same clock cycle The minimum value of the timer time is determined to be the sending time stamp information, the sending time stamp information is encapsulated into a high-precision time synchronization protocol packet, and the high-precision time synchronization protocol packet is inserted into the overhead reserved field of the time-stamp data frame, and in the next frame The time stamp data frame is sent to the receiving end before the head pulse, which realizes the time stamp information transmission in the OTN optical transmission network, improves the accuracy of the time stamp information, and reduces the time error between different devices.

Fig. 3 is a flowchart of a method for transmitting time stamp information provided by an embodiment of the present application. The embodiment of the present application is applicable to the case of transmitting time stamp information in an OTN optical transmission network using the OTUw-RS protocol in a fronthaul network. The time stamp information transmission device in the embodiment of the application is implemented. The device can be implemented by software and/or hardware. The device is generally integrated at the receiving end of the OTN optical transmission network. This method for transmitting time stamp information specifically includes the following steps.

Step 310: Search for the OTUw-RS frame header in the parallel data stream, and generate a frame header pulse.

Specifically, the receiving end searches for the OTUw-RS frame header in the parallel data stream, for example, searches for the AM frame header in the parallel data stream on the parallel interface in the receiving direction. The AM frame header can meet the requirements of the OTUw-RS protocol. After the OTUw-RS frame header, the frame header pulse can be output.

Step 320: Determine receiving time stamp information according to the frame header pulse and the sampling clock.

The received time stamp information may be the time when the OTUw-RS frame header is received, and the received time stamp information may specifically be the total number of seconds from 00: 00: 00 on January 1, 1970, Greenwich Mean Time.

In the embodiment of the present application, the pulse signal of the frame head pulse is collected and the collected time information is determined according to the collection clock. The time information can be used as the receiving time stamp information. For example, the frame head is collected according to each clock edge of the collection clock. For pulse, each clock edge can correspond to a piece of time information, and the average value of all collected time information can be used as receiving time stamp information, or each time information can be used as receiving time stamp information.

Step 330: Obtain the transmission time stamp information sent by the transmitting end through the time stamp data frame.

In an exemplary embodiment, the receiving end can obtain the transmission time stamp in the received time stamp data frame, and can directly extract the information of the time stamp field position as the transmission time stamp information according to the frame structure of the time stamp time frame.

In the embodiment of the application, the OTUw-RS frame header is searched in the parallel data stream, and the frame header pulse is generated, the receiving time stamp information is determined according to the frame header pulse and the sampling clock, and the transmission time stamp sent by the sending end through the time stamp data frame is extracted Information, realizes the time information transmission of OTUw-RS equipment, improves the accuracy of time stamp information, and reduces the time error between different equipment in the communication network.

In one embodiment, on the basis of the above-mentioned application embodiment, the baud rate of the frame header pulse is configured to be at least 4 times the clock period corresponding to the sampling clock.

Specifically, in order to ensure the correct sampling of the frame header pulse under a low-speed clock and improve the accuracy of time stamp information acquisition, the baud rate of the frame header pulse is configured to be at least 4 times the clock period of the sampling clock, where the baud rate can be Refers to the retention time of 1 bit of the frame header pulse. In this embodiment, the baud rate of the frame header pulse can be configured to be 16 or 32 clock cycles of the sampling clock.

FIG. 4 is a flowchart of another method for transmitting time stamp information provided by an embodiment of the present application. The embodiment of the present application is based on the above-mentioned application embodiment, and determines the frame headers at the rising and falling edges of the acquisition clock respectively. Pulse receiving time stamp information, and determining the sending format of the received time stamp information according to the high-precision time synchronization protocol package. Referring to FIG. 4, the time stamp information transmission method provided in the embodiment of the present application specifically includes the following steps.

Step 410: Search for the OTUw-RS frame header in the parallel data stream, and generate a frame header pulse.

Step 420: Sample the frame header pulses according to the rising edge and the falling edge of the sampling clock, and lock the timer time corresponding to the sampling clock.

Specifically, the receiving end collects two frame header pulses in each clock cycle of the sampling clock, which can be collected once at the rising edge and once at the falling edge. The timer that collects the frame header pulses at the rising and falling edges respectively Time locked. The clock cycle of the sampling clock at the receiving end may be the same as the clock cycle of the sampling clock at the transmitting end.

Step 430: Determine the minimum value of the timer time corresponding to the same clock cycle as the received time stamp information.

Among them, the receiving time stamp information is the time information when the receiving end receives the OTUw-RS frame header.

Specifically, the acquisition clock can include multiple clock cycles, and each clock cycle can correspond to two timer times. In the same clock cycle, the two timer times are compared, and the minimum timer time is used as the receiving timestamp. information.

Step 440: Extract a high-precision time synchronization protocol packet from the overhead reserved field of the time stamp data frame.

In the embodiment of the present application, the receiving end sends the transmission time stamp information through the time stamp data frame, and obtains the high-precision time synchronization protocol packet in the time stamp data frame according to the position of the pre-appointed overhead reserved field.

Step 450: Extract the transmission time stamp information in the high-precision time synchronization protocol packet.

Specifically, the transmission time stamp information can be extracted according to the data format of the high-precision time synchronization protocol packet.

Step 460: Determine the correspondence between the transmission time stamp information and the OTUw-RS frame header.

In the embodiment of this application, there is a correspondence between the transmitted OTUw-RS frame header and the transmission time stamp information, and the receiving end can use the transmission time stamp information within the threshold time after receiving the OTUw-RS frame header as the corresponding OTUw-RS frame The sending timestamp of the header, where the preset time can be one or more clock cycles corresponding to the acquisition clock.

In the embodiment of the application, by searching for the OTUw-RS frame header in the parallel data stream, and generating the frame header pulse, the frame header pulse is collected according to the rising and falling edges of the sampling clock, and the corresponding timer time is locked, which will correspond to the same clock cycle The minimum of the timer time is determined to receive the time stamp information, extract the high-precision time synchronization protocol packet from the overhead reserved field of the time stamp data frame, extract the transmission time stamp information, and determine the transmission time stamp information and OTUw-RS frame The correspondence between the headers realizes the time information transmission of the OTUw-RS device, improves the accuracy of the time stamp information, and reduces the time error between different devices in the communication network.

In one embodiment, on the basis of the foregoing application embodiment, the baud rate of the frame header pulse is configured to be at least 4 times the clock period corresponding to the sampling clock.

In an exemplary embodiment, FIG. 5 is an exemplary diagram of a time stamp information transmission method provided by an embodiment of the present application, using OTUw-RS protocol AM/CWM frame header to collect Precise Time Protocol (Precise Time Protocol, PTP) Packet timestamp, and use the overhead reserved field to send PTP packets. See Figure 5. Timestamp information transmission can include two processes: sending and receiving. The sending process includes: 1. Inserting the OTUw-RS frame header in the parallel data stream in the sending direction. And generate the frame header pulse. 2. Using the frame header pulse, the time stamp of the OTUw-RS frame header in the sending direction is collected based on the rising and falling edges of the sampling clock. 3. Encapsulate the time stamp as a PTP packet and insert it into the overhead reserved field. The receiving process includes: 1. Searching for the OTUw-RS frame header in the parallel data stream in the receiving direction, and generating frame header pulses. 2. Using the frame header pulse, the time stamp of the OTUw-RS frame header in the receiving direction is collected based on the rising and falling edges of the sampling clock.

FIG. 6 is a schematic structural diagram of a time stamp information transmission device provided by an embodiment of the present application, which can execute the time stamp information transmission method provided in any embodiment of the present application, and has functional modules and beneficial effects corresponding to the execution method. The device can be implemented by software and/or hardware. Generally, the transmitting end of the integrated optical transmission network includes: a first pulse module 51, a time determination module 52, and an information sending module 53.

The first pulse module 51 is used to insert the OTUw-RS frame header into the parallel data stream and generate frame header pulses.

The time determining module 52 is configured to determine the sending time stamp information according to the frame header pulse and the sampling clock.

The information sending module 53 is configured to send the sending time stamp information to the receiving end through a time stamp data frame.

In the embodiment of this application, the OTUw-RS frame header is inserted into the parallel data stream through the first pulse module, and the frame header pulse is generated. The time determination module determines the transmission time stamp by the sampling clock and the frame header pulse, and the information transmission module passes the time stamp data frame Sending the time stamp information to the receiving end realizes the time stamp information transmission in the OTN optical transmission network, improves the accuracy of the time stamp information, and can reduce the time error between different devices.

In one embodiment, on the basis of the above-mentioned application embodiment, the time determination module 52 includes: a time locking unit, configured to separately collect the frame header pulses according to the rising edge and the falling edge of the sampling clock, and lock the The timer time of the sampling clock; the time stamp determining unit is used to determine the minimum value of the timer times corresponding to the same clock cycle as the sending time stamp information.

In one embodiment, on the basis of the foregoing application embodiment, the frequency of the sampling clock in the time determining module 52 is 1 GHz, and the step of the sampling clock is 1 nanosecond.

In one embodiment, on the basis of the above application embodiment, the information sending module 53 includes: a packet encapsulation unit, configured to encapsulate the transmission time stamp information into a high-precision time synchronization protocol packet; and a packet insertion unit, configured to The high-precision time synchronization protocol packet is inserted into the overhead reserved field of the time stamp data frame; the frame sending unit is configured to send the time stamp data frame to the receiving end before the next frame header pulse.

In one embodiment, on the basis of the above-mentioned application embodiment, the baud rate of the frame header pulse in the device is configured to be at least 4 times the clock period corresponding to the sampling clock.

FIG. 7 is a schematic structural diagram of another time stamp information transmission device provided by an embodiment of the present application, which can execute the time stamp information transmission method provided in any embodiment of the present application, and has the corresponding functional modules and beneficial effects of the execution method. The device may be implemented by software and/or hardware. Generally, the receiving end of an integrated optical transmission network includes: a second pulse module 61, a receiving time module 62, and a sending time module 63.

The second pulse module 61 is used to search for the OTUw-RS frame header in the parallel data stream and generate frame header pulses.

The receiving time module 62 determines the receiving time stamp information according to the frame header pulse and the sampling clock.

The sending time module 63 is used to obtain the sending time stamp information sent by the sending end through the time stamp data frame.

In the embodiment of the application, the second pulse module searches for the OTUw-RS frame header in the parallel data stream and generates the frame header pulse. The receiving time module determines the receiving time stamp information according to the frame header pulse and the sampling clock, and the sending time module extracts the sending end The time stamp information sent by the time stamp data frame realizes the time information transmission of the OTUw-RS device, improves the accuracy of the time stamp information, and reduces the time error between different devices in the communication network.

In one embodiment, on the basis of the above-mentioned application embodiment, the receiving time module 62 includes: a time determining unit, configured to sample the frame header pulse according to the rising edge and the falling edge of the sampling clock, and lock The timer time corresponding to the sampling clock. The time stamp selection unit is configured to determine the minimum value of the timer times corresponding to the same clock cycle as the received time stamp information.

In one embodiment, on the basis of the foregoing application embodiment, the frequency of the sampling clock in the receiving time module 62 is 1 GHz, and the step of the sampling clock is 1 nanosecond.

In one embodiment, on the basis of the foregoing application embodiment, the sending time module 63 includes: a packet extraction unit, configured to extract a high-precision time synchronization protocol packet from the overhead reserved field of the time stamp data frame. The time stamp extraction unit is used to extract the transmission time stamp information in the high-precision time synchronization protocol packet. The frame header corresponding unit is used to determine the correspondence between the transmission timestamp information and the OTUw-RS frame header.

FIG. 8 is a schematic structural diagram of a device provided by an embodiment of the present application. As shown in FIG. 8, the device includes a processor 70, a memory 71, an input device 72, and an output device 73; the number of processors 70 in the device can be one Or more, one processor 70 is taken as an example in FIG. 8; the device processor 70, the memory 71, the input device 72, and the output device 73 may be connected by a bus or other methods. In FIG. 8, the connection by a bus is taken as an example.

The memory 71, as a computer-readable storage medium, can be used to store software programs, computer-executable programs, and modules, such as the modules (first pulse module 51, time determination module 52) corresponding to the time stamp information transmission device provided in the embodiment of the present application. And the information sending module 53, and/or, the second pulse module 61, the receiving time module 62, and the sending time module 63). The processor 70 executes various functional applications and data processing of the device by running the software programs, instructions, and modules stored in the memory 71, that is, realizes the above-mentioned time stamp information transmission method.

The memory 71 may mainly include a program storage area and a data storage area. The program storage area may store an operating system and an application program required by at least one function; the data storage area may store data created according to the use of the terminal, and the like. In addition, the memory 71 may include a high-speed random access memory, and may also include a non-volatile memory, such as at least one magnetic disk storage device, a flash memory device, or other non-volatile solid-state storage devices. In some examples, the memory 71 may further include a memory remotely provided with respect to the processor 70, and these remote memories may be connected to the device through a network. Examples of the aforementioned networks include, but are not limited to, the Internet, corporate intranets, local area networks, mobile communication networks, and combinations thereof.

The input device 72 can be used to receive inputted numeric or character information, and generate key signal inputs related to user settings and function control of the device. The output device 73 may include a display device such as a display screen.

In an exemplary embodiment, FIG. 9 is an implementation example diagram of an optical transmission device provided in an embodiment of the present application. Referring to FIG. 9, the optical transmission device includes an equalization module, a clock and data recovery (Clock and Data Recovery, CDR). ) Module, Phase Locked Loop (PLL) Module, Serial-to-Parallel Conversion Module, Parallel-to-Serial Conversion Module, Asynchronous First Input First Output (FIFO) Module, Encoding/Adding Winding Module, Decoding/Descrambling Module It also includes OTUw-RS framing module, OTUw overhead extraction module, OTUw-RS frame header insertion module, OTUw overhead insertion module, timer and time stamp sampling module, off-chip processor and other modules. Through the equalization module, clock data recovery CDR module, phase-locked loop PLL module, serial-to-parallel conversion module, parallel-to-serial conversion module, asynchronous FIFO module, encoding/wrapping module, decoding/descrambling module, OTUw-RS framing module, OTUw The overhead extraction module, the OTUw-RS frame header insertion module, and the OTUw overhead insertion module realize the determination and transmission of the time stamp information. The OTUw-RS framing module realizes the function of real-time generation of OTUw-RS frame header pulse in the receiving direction, and sends the frame header pulse to the timer and time stamp sampling module to sample the time stamp, and then send it to the off-chip processor, and at the same time the OTUw overhead extraction module The overhead corresponding to the OTUw-RS frame header is sent to the off-chip processor, and the off-chip processor parses the PTP packet in the overhead reserved field. The timer and time stamp sampling module uses the rising and falling edges of a 1 gigahertz (GHz) clock to sample the frame header pulse signal. Compared with only using the rising edge to sample the frame header pulse signal, the sampling accuracy is doubled. The pins of the timer and time stamp sampling module output to the off-chip processor support 1-bit (bit) retention time, that is, the baud rate can be configured to 16 or 32 timing clock cycles, which can ensure that the off-chip processor is able to operate under a low-speed clock. The off-chip processor that loads the correct sampling of the time stamp data frame realizes the receiving side PTP packet parsing and the sending side PTP packet grouping. The PTP packet parsing on the receiving side refers to recombining the overhead sent by the OTUw overhead extraction module into a PTP packet, and the overhead reserved field used is negotiated with the peer device. The sending-side PTP packet grouping refers to encapsulating the time stamp information into the PTP packet. The time stamp information comes from the OTUw-RS frame header pulse in the sending direction sampled by the timer and the time stamp sampling module.

FIG. 10 is an example diagram of time synchronization provided by an embodiment of the present application. Based on the time-stamp transmission method implemented in the present application, the implementation of time synchronization between devices is taken as an example.

Step 1. In accordance with the requirements of the G.709.4 protocol, the time issuer inserts the OTU25-RS protocol AM frame header on the parallel interface of the transmitting side, and outputs the frame header pulse signal at the same time. The timing clock in the embodiment of the present application uses 1 GHz with a step of 1 nanosecond. Use the rising edge and the falling edge of the timing clock to sample the frame header pulse signal respectively, and latch the timer time, and select the smaller value of the two timer times as the frame header time stamp, which is marked as t1. After the frame header pulse signal goes low, after a configurable integer number of timing clocks, start sending the time stamp data frame Sync to the off-chip processor through the send side time stamp pin, and ensure that the transmission is completed before the next frame header pulse signal data. In order to ensure that the off-chip processor correctly samples the loaded time stamp data frame under a low-speed clock, the 1-bit hold time, that is, the baud rate, can be configured to 16 or 32 timing clock cycles. The time stamp data frame is 106 bits in total, including 1 bit start bit, two 8 bit frame header synchronization bytes, 80 bit time stamp byte, 8 bit check byte and 1 bit stop bit. Among them, the start bit is 1 bit high power Ping, used to identify the beginning of the time stamp data frame; the stop bit is 1bit low level, used to identify the end of the time stamp data frame; the frame header synchronization byte is used to synchronize the time stamp data frame; the time stamp byte is used to store the time stamp Information, 48bit second data, 32bit nanosecond data, you can send the second data first and then send the nanosecond data; the check byte is used to verify whether the data in the time stamp data frame is correct, you can use the 1PPS_TOD standard (where 1PPS is called 1Pulse per second, the second pulse; TOD is called Time of Day, the TOD frame cyclic redundancy check (Cyclic Redundancy Check, CRC), CRC check formula: x^8+x^5+x^4+1, The initial value of the check code is set to 0xFF, and the input data does not need to be inverted. The check algorithm adopts right shift calculation. When the check byte is sent, the least significant bit bit0 is sent first.

Step 2: The off-chip processor encapsulates the time stamp t1 in the time stamp data frame into an IEEE1588v2 PTP packet Follow_Up message, adjusts the delay appropriately, and inserts it into the overhead reserved field of the OTU25 data packet within an OTU25-RS frame period.

Step 3. The receiving side of the time receiver searches for the AM frame header of the OTU25-RS on the parallel interface of the receiving direction in accordance with the requirements of the G.709.4 protocol, and outputs the frame header pulse signal.

Step 4: Use the rising edge and falling edge of the timing clock to sample the frame header pulse signal respectively, and latch the timer time, select the smaller value of the two as the frame header time stamp, and record it as t2.

Step 5. After the frame header pulse signal goes low, after a configurable integer number of timing clocks, start sending the time stamp data frame to the off-chip processor through the receiving side time stamp pin, and ensure that it is before the next frame header pulse signal Finish transmitting the data.

Step 6. The off-chip processor extracts the PTP packet in the overhead reserved field through the OTU25 overhead extraction module, and corresponds to the time stamp in the previous time stamp data frame, to obtain the sampling time stamp t1 of the PTP packet at the time issuer.

Step 7. The time receiver sends the PTP packet Delay_Req message to the time issuer, the sending time stamp is t3, and the sampling time stamp of the message received by the time issuer is t4.

Step 8. The time issuer encapsulates the t4 in Delay_Resp message and sends it to the time receiver.

Step 9. The off-chip processor calculates the time difference between the master and slave devices based on the IEEE 1588v2 protocol, and calibrates the local clock, where t2 = time offset (offset) + delay (delay) + t1, t4 = t3-offset + delay. According to the foregoing formula, it can be calculated: delay=((t2-t1)+(t4-t3))/2, time offset offset=((t2-t1)-(t4-t3))/2, based on the determined time offset Perform time synchronization.

The embodiment of the present application also provides a computer-readable storage medium. When the computer-executable instructions are executed by a computer processor, they are used to perform a time-stamp information transmission method. The method includes: inserting an OTUw-RS frame header into a parallel data stream , And generate a frame header pulse; determine the transmission time stamp information according to the frame header pulse and the sampling clock; send the transmission time stamp information to the receiving end through a time stamp data frame. And/or search the OTUw-RS frame header in the parallel data stream, and generate the frame header pulse; determine the receiving time stamp information according to the frame header pulse and the sampling clock; obtain the transmission time stamp information sent by the sending end through the time stamp data frame .

Of course, a storage medium containing computer-executable instructions provided by the embodiments of the present application is not limited to the method operations described above, and can also execute the function remote customization method provided by any embodiment of the present application. Related operations.

The above are only exemplary embodiments of the present application, and are not used to limit the protection scope of the present application.

Those skilled in the art should understand that the term user terminal encompasses any suitable type of wireless user equipment, such as a mobile phone, a portable data processing device, a portable web browser, or a vehicle-mounted mobile station.

Generally speaking, the various embodiments of the present application can be implemented in hardware or dedicated circuits, software, logic or any combination thereof. For example, some aspects may be implemented in hardware, while other aspects may be implemented in firmware or software that may be executed by a controller, microprocessor, or other computing device, although the application is not limited thereto.

The embodiments of the present application may be implemented by executing computer program instructions by a data processor of a mobile device, for example, in a processor entity, or by hardware, or by a combination of software and hardware. Computer program instructions can be assembly instructions, instruction set architecture (ISA) instructions, machine instructions, machine-related instructions, microcode, firmware instructions, state setting data, or source code written in any combination of one or more programming languages or Object code.

The block diagram of any logic flow in the drawings of the present application may represent program steps, or may represent interconnected logic circuits, modules, and functions, or may represent a combination of program steps and logic circuits, modules, and functions. The computer program can be stored on the memory. The memory can be of any type suitable for the local technical environment and can be implemented using any suitable data storage technology, such as but not limited to read only memory (Read Only Memory, ROM), random access memory (Random Access Memory, RAM), and optical storage. Devices and systems (Digital Versatile Disc (DVD) or Compact Disc (CD)), etc. Computer-readable media may include non-transitory storage media. The data processor can be any type suitable for the local technical environment, such as but not limited to general-purpose computers, special-purpose computers, microprocessors, digital signal processors (Digital Signal Processing, DSP), application specific integrated circuits (ASICs) ), programmable logic devices (Field-Programmable Gate Array, FPGA), and processors based on multi-core processor architecture.

By way of exemplary and non-limiting examples, a detailed description of the exemplary embodiments of the present application has been provided above. However, considering the accompanying drawings and claims, various modifications and adjustments to the above embodiments are obvious to those skilled in the art, but they do not deviate from the scope of the present application. Therefore, the proper scope of the application will be determined according to the claims.

Claims

A method for transmitting time stamp information, applied to a sending end, and the method includes:

Insert the OTUw-RS frame header into the parallel data stream and generate frame header pulses;

Determining the sending time stamp information according to the frame header pulse and the sampling clock;

The sending time stamp information is sent to the receiving end through a time stamp data frame.
The method according to claim 1, wherein the determining the sending time stamp information according to the frame header pulse and the sampling clock comprises:

Collecting the frame header pulses respectively according to the rising edge and the falling edge of the sampling clock, and locking the timer time of the sampling clock;

The minimum value of the timer times corresponding to the same clock cycle is determined as the sending time stamp information.
The method according to claim 2, wherein the frequency of the sampling clock is 1 GHz, and the step of the sampling clock is 1 nanosecond.
The method according to claim 2, wherein the sending the sending timestamp information to the receiving end through a timestamp data frame comprises:

Encapsulating the sending timestamp information into a high-precision time synchronization protocol packet;

Inserting the high-precision time synchronization protocol packet into the overhead reserved field of the time stamp data frame;

The time stamp data frame is sent to the receiving end before the next frame header pulse.
The method according to any one of claims 1 to 4, wherein the baud rate of the frame header pulse is configured to be at least 4 times the clock period corresponding to the sampling clock.
A method for transmitting time stamp information, applied to a receiving end, and the method includes:

Search for the OTUw-RS frame header in the parallel data stream and generate frame header pulses;

Determining receiving time stamp information according to the frame header pulse and the sampling clock;

Obtain the sending time stamp information sent by the sending end through the time stamp data frame.
The method according to claim 6, wherein the determining the receiving time stamp information according to the frame header pulse and the sampling clock comprises:

Respectively sample the frame header pulse according to the rising edge and the falling edge of the sampling clock, and lock the timer time corresponding to the sampling clock;

The minimum value of the timer times corresponding to the same clock cycle is determined as the received time stamp information.
The method according to claim 7, wherein the frequency of the sampling clock is 1 GHz, and the step of the sampling clock is 1 nanosecond.
The method according to claim 8, wherein said obtaining the transmission timestamp information sent by the sending end through the timestamp data frame comprises:

Extracting a high-precision time synchronization protocol packet from the overhead reserved field of the time stamp data frame;

Extracting the sending timestamp information in the high-precision time synchronization protocol package;

Determine the correspondence between the sending timestamp information and the OTUw-RS frame header.
The method according to any one of claims 6-9, wherein the baud rate of the frame header pulse is configured to be at least 4 times the clock period corresponding to the sampling clock.
A time stamp information transmission device, applied to a sending end, and the device includes:

The first pulse module is used to insert the OTUw-RS frame header into the parallel data stream and generate frame header pulses;

A time determining module, configured to determine the sending time stamp information according to the frame header pulse and the sampling clock;

The information sending module is used to send the sending time stamp information to the receiving end through a time stamp data frame.
A time stamp information transmission device, applied to a receiving end, and the device includes:

The second pulse module is used to search for the OTUw-RS frame header in the parallel data stream and generate frame header pulses;

The receiving time module determines the receiving time stamp information according to the frame header pulse and the sampling clock;

The sending time module is used to obtain the sending time stamp information sent by the sending end through the time stamp data frame.
A device that includes:

One or more processors;

Memory, used to store one or more programs,

When the one or more programs are executed by the one or more processors, the one or more processors implement the time stamp information transmission method according to any one of claims 1-10.
A computer-readable storage medium having a computer program stored thereon, and when the program is executed by a processor, the method for transmitting time stamp information according to any one of claims 1-10 is realized.