WO2022007682A1

WO2022007682A1 - Method and device for sending data

Info

Publication number: WO2022007682A1
Application number: PCT/CN2021/103659
Authority: WO
Inventors: 罗俊; 王苏; 程贵锋; 牛川
Original assignee: 华为技术有限公司
Priority date: 2020-07-06
Filing date: 2021-06-30
Publication date: 2022-01-13
Also published as: CN113905292A

Abstract

The present application relates to the field of communications, and discloses a method and device for sending data. The method comprises: a first network node receives control data sent by a control device, the control data being used to control at least one controlled device among a plurality of controlled devices; the first network node sends a first data frame to a second network node, the first data frame comprising the control data and configuration information of a first time period, the second network node being connected to the at least one controlled device, the time length of the first time period being determined on the basis of a data amount corresponding to the second network node, the data amount being equal to a cumulative value of the data amount of response data requiring sending by each controlled device among the at least one controlled device, and the configuration information being used by the second network node to determine the first time period and forward in the first time period the response data sent by each controlled device. The present application can reduce the latency in sending data.

Description

Method and device for sending data

This application requires the application number 202010641892.9 submitted on July 06, 2020, the invention name is "OLT, ONU and network system", and the application number 202011045588.4 submitted on September 28, 2020, the invention name is "Transmission data" The priority of the Chinese Patent Application for "Method and Apparatus", the entire contents of which are incorporated herein by reference.

technical field

The present application relates to the field of communications, and in particular, to a method and apparatus for sending data.

Background technique

The industrial control network connects the control device and the controlled device, and the control device can control the controlled device through the industrial control network. For example, the controlled device can be an industrial robot, and the control device can control the industrial robot through an industrial control network, so that the industrial robot can perform production operations.

The current industrial control network can be carried by passive optical network (PON). PON includes optical line terminal (OLT) and multiple optical network units (ONU). OLT is connected to each connected to each ONU. The control equipment is connected with the OLT, and each controlled equipment is connected with an ONU. The time slot corresponding to each ONU in the PON in one cycle is determined in advance.

When the control device controls a controlled device, the OLT receives the control command from the control device and sends the control command to the ONU connected to the controlled device; the ONU sends the control command to the controlled device and receives the controlled device Returns response data for this control command. In the time slot corresponding to the ONU, the ONU sends the response data to the control device through the OLT. The time slot corresponding to the ONU in the current cycle is outdated, and in the time slot corresponding to the ONU in the next cycle, the ONU sends the response data to the control device through the OLT. This solution may result in a longer delay in data transmission.

SUMMARY OF THE INVENTION

The present application provides a method and apparatus for sending data, so as to reduce the delay of data sending. The technical solution is as follows:

In a first aspect, the present application provides a method for sending data, and the method is applied in a network including a plurality of controlled devices. In the method: the first network node receives control data sent by the control device, where the control data is used to control at least one controlled device among the multiple controlled devices. The first network node sends a first data frame to the second network node, where the first data frame includes control data and configuration information of the first time period, the second network node is connected to the at least one controlled device, and the time of the first time period The length is determined based on the data volume corresponding to the second network node, the data volume is equal to the cumulative value of the data volume of the response data that needs to be sent by each controlled device in the at least one controlled device, and the configuration information is used for the second network node. The network node determines the first time period and forwards the response data sent by each controlled device in the first time period.

Wherein, since the at least one controlled device needs to send response data to the control device, the second network node connected to the at least one controlled device needs to send the response data of the controlled device to the first network node, so that at the second network node When data needs to be sent, the first time period is allocated to the second network node, and the first time period is used to send response data, and there is no need to wait for the arrival of the first time period for a long time, which avoids wasting time resources and reducing time. Small delay for sending data. In addition, because the first time period is allocated according to the data volume corresponding to the second network node, it is ensured that the first time period can be just used for the second network node to send data, thereby further avoiding the waste of time resources.

In a possible implementation manner, the first network node allocates the first time period to the second network node according to the attribute information of the second network node and the data amount corresponding to the second network node. The start time of the first time period of the second network node is determined according to the attribute information of each second network node, thereby ensuring that the first network node can continuously and uninterruptedly receive response data sent by different second network nodes.

In another possible implementation manner, the attribute information of the second network node includes a performance parameter of the second network node and/or a transmission delay from the second network node to the first network node. Since different second network nodes have different performances and different distances from different second network nodes to the first network node, when the attribute information includes the performance parameters and/or the transmission time delay of the second network node, according to the second network node's The attribute information allocates the first time period to ensure that the first network node can continuously and uninterruptedly receive response data sent by different second network nodes.

In another possible implementation manner, the first network node acquires attribute information of the second network node.

In another possible implementation manner, the number of control devices connected to the first network node is multiple, each control device in the multiple control devices corresponds to a different second time period, and at least one controlled device is controlled by multiple control devices. Controlled by one of the control devices, the first time period is within the second time period corresponding to the one control device. In this way, an industrial control network can be used for different control equipment to control the controlled equipment, and the utilization rate of the industrial control network can be improved.

In another possible implementation manner, the first network node acquires, according to the control data, the data amount of response data that needs to be sent by each controlled device. In this way, the amount of data corresponding to the second network node can be further obtained, so that the first time period can be accurately calculated.

In another possible implementation, the control data includes commands for controlling each controlled device. The first network node acquires, according to the type of the command of each controlled device, the data amount of response data that needs to be sent by each controlled device.

In another possible implementation manner, the first network node receives response data of each controlled device sent by the second network node within the first time period. The first network node sends a second data frame to the control device, where the second data frame includes the response data of each controlled device arranged according to the sequence of receiving the response data of each controlled device.

In a second aspect, the present application provides an apparatus for sending data, which is used to execute the method in the first aspect or any possible implementation manner of the first aspect. Specifically, the apparatus includes means for performing the method of the first aspect or any one of possible implementations of the first aspect.

In a third aspect, the present application provides an apparatus for sending data, the apparatus comprising: a processor, a memory and a transceiver. Wherein, the processor, the memory and the transceiver may be connected through a bus system. The memory is used to store one or more programs, and the processor is used to execute the one or more programs in the memory to cause the apparatus to perform the method of the first aspect or any possible implementation of the first aspect.

In a fourth aspect, the present application provides a computer-readable storage medium, where program codes are stored in the computer-readable storage medium, and when the computer-readable storage medium runs on a multi-link device, the multi-link device enables the multi-link device to perform the above-mentioned first aspect or the first aspect. A method in any possible implementation of an aspect.

In a fifth aspect, the present application provides a computer program product comprising program code, which, when the program code runs on a network node, enables the network node to execute the method in the first aspect or any possible implementation manner of the first aspect .

Description of drawings

1 is a schematic diagram of a network architecture provided by an embodiment of the present application;

2 is a schematic diagram of another network architecture provided by an embodiment of the present application;

3 is a flowchart of a method for sending data provided by an embodiment of the present application;

4 is a schematic diagram of time period allocation provided by an embodiment of the present application;

5 is a schematic diagram of a data frame transmission provided by an embodiment of the present application;

6 is a schematic structural diagram of an apparatus for sending data provided by an embodiment of the present application;

FIG. 7 is a schematic structural diagram of another apparatus for sending data provided by an embodiment of the present application.

detailed description

The embodiments of the present application will be described in further detail below with reference to the accompanying drawings.

In the process of realizing this application, the inventor found that the prior art has at least the following problems:

When an ONU sends response data, it may wait until the time slot corresponding to the ONU in the next cycle before sending, resulting in a long delay in data sending. When the time slot corresponding to some ONUs in a cycle arrives, but the ONU has no data to send to the control device, or the length of the data that the ONU needs to send is short, and the time required to send the data is shorter than the time slot The length of the time slot corresponding to the ONU causes waste of time slot resources; or, the length of the data that the ONU needs to send is longer, the time length required to send the data is greater than the length of the time slot, and the ONU needs the ONU in multiple cycles. The data is sent in the corresponding time slot, resulting in a long delay in data sending.

Referring to FIG. 1 , an embodiment of the present application provides a network architecture, and the network architecture may be a point-to-multipoint tree network architecture. The network architecture includes a first network node and a plurality of second network nodes. A network connection is established between the first network node and each of the second network nodes.

Optionally, for any second network node, there is no other network node on the network connection between the first network node and the second network node. That is, the data sent by the first network node to the second network node or the data sent by the second network node to the first network node may not need to be forwarded by other network nodes. or,

Optionally, in some embodiments, for any second network node, the network connection between the first network node and the second network node may also include one or more forwarding nodes, and the forwarding nodes are used for transmitting Data communicated between the first network node and the second network node.

Optionally, the network architecture can be used as an industrial control network for the control device to control multiple controlled devices. The control device communicates with the first network node, and each controlled device communicates with a second network node. In this way, the process that the control device controls the controlled device may include: the control device sends the control data corresponding to each of the N controlled devices to the first network node, where N is an integer greater than 0. The first network node determines M second network nodes according to the control data corresponding to each controlled device, and each second network node in the M second network nodes is connected to one or more of the N controlled devices. A controlled device is different from the controlled device connected to each second network node. The first network node allocates a different first time period to each second network node, and sends control data corresponding to the controlled device connected to each second network node to each second network node. For any second network node, the second network node sends the control data corresponding to the controlled device to the controlled device connected to it, receives the response data from the controlled device in response to the control data, and the second network node corresponds to the control data. The response data of the controlled device is sent to the first network node in the first time period. The first network node sends the response data of the controlled device to the control device.

As shown in Figure 1, the control device manages three controlled devices: controlled devices 1 to 3, the controlled device 1 communicates with the second network node 1, the controlled device 2 communicates with the second network node 2, and the controlled device 3 Communicate with the second network node 3 . The second network nodes 1 to 3 communicate with the first network node, respectively. The control device sends the control data corresponding to each of the controlled devices 1 to 3 to the first network node, and the first network node receives the control data corresponding to each of the controlled devices 1 to 3 according to the received control data. It is determined that the controlled devices 1 to 3 communicate with the first network node via the second network nodes 1 to 3 respectively. The first network node allocates the first time period 1 to the second network node 1, the first network node allocates the first time period 2 to the second network node 2, and the first network node allocates the first time period 3 to the second network node 3 . The first network node sends the control data corresponding to the controlled device 1 to the second network node 1, sends the control data corresponding to the controlled device 2 to the second network node 2, and sends the control data corresponding to the controlled device 3 to the second network node 3. corresponding control data. The second network node 1 receives the response data sent by the controlled device 1, and sends the response data of the controlled device 1 to the first network node in the first time period 1; the second network node 2 receives the response data sent by the controlled device 2, Send the response data of the controlled device 2 to the first network node in the first time period 2; the second network node 3 receives the response data sent by the controlled device 3, and sends the controlled device to the first network node in the first time period 3. 3 response data. On the basis of the solution in FIG. 1 , the second network node 1 can also communicate with the controlled device 4, send to the controlled device 4 the control data corresponding to the controlled device 4 sent by the control device via the first network node, and will be sent to the controlled device 4 by the control device via the first network node. The response data sent by the control device 4 is sent to the first network node.

On the basis of the solution in FIG. 1 , other control devices may also be included, and other control devices and the control device in FIG. 1 may share load or form a master-standby relationship.

The detailed implementation process of allocating the first time period by the first network node to each second network node will be described in detail in subsequent embodiments, and will not be described in detail here.

Optionally, referring to FIG. 2 , the first network node is connected to multiple control devices, and each control device corresponds to a group of controlled devices. For any control device, each controlled device in a group of controlled devices corresponding to the control device is connected to a second network node. The control device controls a group of controlled devices corresponding to the control device through the network architecture.

For example, referring to FIG. 2 , the first network node is connected to the control device 1 and the control device 2, and a group of controlled devices corresponding to the control device 1 includes the controlled device 1, the controlled device 2, and the controlled device 3. The controlled device 1 , the controlled device 2 and the controlled device 3 are respectively connected to the second network node 1 , the second network node 2 and the second network node 3 . A set of controlled devices corresponding to control device 2 includes controlled device 4, controlled device 5 and controlled device 6. The network node 2 is connected to the second network node 3 .

Optionally, the first network node is connected to one or more control devices through an interface. Optionally, the interface may be a high-speed serial computer expansion bus standard (peripheral component interconnect express, PCIe) interface or an Ethernet (ethernet, Eth) interface, or the like.

Optionally, the second network node is connected to the controlled device through an interface. Optionally, the interface may be an input/output (input/output, I/O) interface or the like.

Optionally, the network architecture is a PON, the first network node is an OLT, and the second network node is an ONU. Alternatively, the network architecture is a wireless network architecture, and the network connection between the first network node and each second network node is a wireless connection.

Since the network architecture is deployed on the industrial site, the controlled devices connected to each second network node are powered by strong electricity, and the network architecture is a PON or wireless network architecture, so that the network architecture will not be disturbed and affected by the strong electricity. .

Optionally, when the network architecture is a PON, the first network node is connected to the optical splitter, and each second network node is connected to the optical splitter, thereby ensuring that the first network node can communicate with multiple second network nodes. A network connection is established between.

For example, assuming that the optical splitter is an optical splitter with a split ratio of 1:64, the optical splitter can be connected to 64 second network nodes, that is to say, the first network node can be established with 64 second network nodes through the optical splitter Internet connection.

Optionally, the first network node may be connected to multiple optical splitters, so that the first network node may establish network connections with more second network nodes, thereby expanding the scale of the industrial control network.

In some embodiments, a multi-stage optical splitter is included between the first network node and the second network node.

Optionally, the above-mentioned control device may be a programmable logic controller (programmable logic controller, PLC), and the above-mentioned controlled device may be an industrial robot, a robotic arm, a sensor, a switch, or the like.

Referring to FIG. 3 , an embodiment of the present application provides a method for sending data, and the method can be applied to the network architecture shown in FIG. 1 or FIG. 2 , including:

Step 301: The first network node receives control data corresponding to each of the N controlled devices sent by the control device, where N is an integer greater than 0.

For any controlled device, the control data of the controlled device includes an identifier of the controlled device and a command for controlling the controlled device.

Optionally, the control data of the controlled device further includes the data volume of the response data that the controlled device needs to respond to the command.

For example, the command is a read command, and the control data may include the data amount of response data of the controlled device in response to the read command. The response data is the data that the control device needs to read from the controlled device.

Optionally, the control data of the controlled device may also not include the data amount of the response data that the controlled device needs to respond to the command. However, based on the type of the command included in the control data of the controlled device, the type of response data that the controlled device responds to the command is obtained, and the type of response data is often data of a fixed size. Therefore, the data volume of the response data sent by the controlled device can be determined according to the control data of the controlled device.

Optionally, the control device sends an Ethernet packet or an Ethernet frame to the first network node, where the Ethernet packet or Ethernet frame includes control data corresponding to each of the N controlled devices.

For example, it is assumed that the command included in the control data of the controlled device is a command used to control the switch to be turned on or off, and the response data of the controlled device in response to the command is a turn-on success indication message, a turn-on failure indication message, a turn-off success indication message or a turn-off indication message. The data volume of the failure indication message, the open success indication message, the open failure indication message, the close success indication message, and the close failure indication message are all equal and have a fixed size. For another example, assuming that the command included in the control data of the controlled device is a positioning command, the response data of the controlled device in response to the command is the location information of the controlled device, and the data including the location information of the controlled device is often fixed-size data. .

Optionally, the first network node is connected to multiple control devices, each control device corresponds to a group of controlled devices, and the N controlled devices belong to a group of controlled devices corresponding to one control device, that is, the N controlled devices. Devices are controlled by the same control device.

Optionally, in this step, the first network node may receive control data of the controlled device sent by different control devices, and determine the control of the controlled device controlled by each control device from the received control data of the controlled device. data.

Step 302: The first network node determines M second network nodes, and acquires the data amount corresponding to each second network node, where M is an integer greater than 0 and less than or equal to N.

Each of the M second network nodes is connected to one or more of the N controlled devices, wherein the controlled device connected to each of the second network nodes is different.

For any second network node among the M second network nodes, the data volume corresponding to the second network node is equal to the data volume of response data sent by the controlled device connected to the second network node.

In this step, it can be implemented through the following operations 3021 to 3022 . The operations of the 3021-3022 are:

3021: The first network node determines the M second network nodes according to the control data of each of the N controlled devices.

In 3021, for each controlled device among the N controlled devices, the first network node determines a second device connected to the controlled device according to the identifier of the controlled device included in the control data of the controlled device network node.

Optionally, the first network node stores a correspondence between the identifier of the second network node and the identifier of the controlled device, and any record in the correspondence includes the identifier of a second network node and the identifier of the second network node. The identifier of each controlled device connected to the node.

Optionally, in 3021, for each controlled device in the N controlled devices, the first network node, according to the identifier of the controlled device included in the control data of the controlled device, from the second network node. The identifier of the second network node connected to the controlled device is obtained from the corresponding relationship between the identifier and the identifier of the controlled device, and the second network node connected to the controlled device is determined according to the identifier of the second network node.

3022: For each second network node in the M second network nodes, the first network node obtains data corresponding to the second network node according to the control data of each controlled device connected to the second network node quantity.

In 3022, for each controlled device connected to the second network node, if the control data of the controlled device includes the data volume of the response data that the controlled device needs to send, the control data from the controlled device Obtain the data volume of the response data that the controlled device needs to send in the , determine the type of response data that the controlled device needs to send, and determine the data volume of the response data that the controlled device needs to send according to the type. The data amount of response data that needs to be sent by each controlled device connected to the second network node is accumulated to obtain the data amount corresponding to the second network node.

Optionally, the first network node may store a correspondence between the type of response data and the amount of data, and any record in the correspondence includes a type and amount of response data.

Optionally, when determining the type of response data to be sent by the controlled device, the data volume of the response data to be sent by the controlled device is obtained from the correspondence between the type of response data and the data volume according to the type.

Step 303: For each second network node, the first network node allocates a first time period to the second network node according to the data volume corresponding to the second network node.

For each second network node, the time length of the first time period of the second network node is determined based on the amount of data corresponding to the second network node.

In this step, it can be implemented by the following operations from 3031 to 3032. The operations from 3031 to 3032 are respectively:

3031: For each second network node, the first network node determines the time period length of the second network node according to the data amount corresponding to the second network node.

Optionally, the first network node calculates the time length of the first time period of each second network node according to the data volume corresponding to each second network node and the uplink bandwidth corresponding to each second network node.

For example, referring to FIG. 1 , it is assumed that according to the data volume corresponding to the second network node 1, the time length of the first time period of the second network node 1 is determined to be 20 milliseconds; The time length of the first time period of the network node 2 is 25 milliseconds; according to the data volume corresponding to the second network node 3, the time length of the first time period of the second network node 3 is determined to be 15 milliseconds.

3032: The first network node determines the start time of the first time period of the second network node according to the time length of the first time period of the second network node, so as to obtain the first time period of the second network node.

Optionally, in 3032, the first time period of each second network node may be obtained in the following first and second manners. The two methods are:

In the first manner, the delay of each of the M second network nodes is the same, and the first network node determines that each of the M second network nodes sends response data According to the time length of the first time period of each second network node and the order in which each second network node sends the response data, determine the start time of the first time period of each second network node, so as to obtain A first time period for each second network node.

The delay of the second network node is equal to the transmission delay from the second network node to the first network node, the processing delay of the second network node, or the transmission delay of the second network node and the processing delay of the second network node accumulated value. The transmission delay of the second network node is determined by the distance from the second network node to the first network node, and the processing delay of the second network node is determined by the processing performance of the second network node.

For example, the M second network nodes include second network node 1 , second network node 2 and second network node 3 . Assuming that the determined sequence is the second network node 1, the second network node 2, and the second network node 3, based on the time length of the first time period of the second network node 1 of 20 milliseconds, the first time of the second network node 2 The time length of the segment is 25 milliseconds, the time length of the first time segment of the third network node 3 is 15 milliseconds, and the first time segment of the second network node 1 is determined to be 0 to 20 milliseconds, and the first The time period is the 21st to 45th milliseconds, and the first time period of the second network node 3 is the 46th to 60th milliseconds.

In this way, the first network node sends the control data 1 of the controlled device 1, the control data 2 of the controlled device 2, and the control of the controlled device 3 to the second network node 1, the second network node 2, and the second network node 3, respectively. Data 3. After sending the control data 1 to the controlled device 1 , the second network node 1 continuously sends response data 1 with a length of 20 milliseconds to the first network node, and the response data 1 is the data sent by the controlled device 1 . After the second network node 2 sends the control data 2 to the controlled device 2, when the delay reaches the 21st millisecond, it continuously sends the response data 2 with a length of 25 milliseconds to the first network node, and the response data 2 is the data sent by the controlled device 2. . After the second network node 3 sends the control data 3 to the controlled device 3, when the delay reaches the 46th millisecond, it continuously sends the response data 3 with a length of 15 milliseconds to the first network node, and the response data 3 is the data sent by the controlled device 3. .

Optionally, for the order in which each second network node sends the response data, the first network node may randomly assign the order in which each second network node sends the response data.

In the second manner, for each second network node, the first network node allocates a first time period to the second network node according to the data volume corresponding to the second network node and attribute information of the second network node .

Due to the different distances between different second network nodes and the first network node, the transmission delays from different second network nodes to the first network node are different, and/or the processing performance of different second network nodes is different, resulting in different transmission delays from different second network nodes to the first network node. The second network node has different processing delays.

In the second method, the delay of each second network node can be calculated according to the attribute information of each second network node, and the delay of the second network node is equal to the transmission delay and processing delay of the second network node. Or the accumulated value of the transmission delay and the processing delay of the second network node. Determine the start time for each second network node to send response data according to the delay of each second network node and the time length of the first time period, that is, to obtain the start time of the first time period for each second network node , so as to obtain the first time period of each second network node.

Optionally, in the second manner, the maximum delay and the maximum time length may be selected from the delay of each second network node and the time length of the first time period, and the maximum delay time, the maximum time length and the The time length of the first time period of each second network node is obtained, and the start time of the first time period of each second network node is obtained, thereby obtaining the first time period of each second network node.

For example, referring to the example shown in FIG. 4 , it is assumed that the delay of the second network node 1 is 10 milliseconds, the delay of the second network node 2 is 12 milliseconds, and the delay of the second network node 3 is 15 milliseconds.

From the time length of the first time period of the second network node 1 20 ms, the time length of the first time period of the second network node 2 25 ms, the time length of the first time period of the third network node 3 15 ms, select The maximum time length is 25 milliseconds. The maximum delay of 15 milliseconds is selected from the delay of the second network node 1 of 10 milliseconds, the delay of the second network node 2 of 12 milliseconds, and the delay of the second network node 3 of 15 milliseconds. Based on the maximum time length of 25 milliseconds and the maximum delay of 15 milliseconds, the calculated reference delay is equal to 25+2*15=55 milliseconds.

According to the reference delay of 55 milliseconds and the delay of the second network node 1 of 10 milliseconds, the starting time of the first time period of the second network node 1 is obtained as 55-2*10=35 milliseconds. The time length of the first time period is 20 milliseconds, that is, the first time period of the second network node 1 is the 35th to 54th milliseconds. The first network node sends the control data 1 to the second network node 1 , and after 10 milliseconds, the second network node 1 sends the control data 1 to the controlled device 1 . After the second network node 1 sends the control data 1, when the delay reaches the 35th millisecond, it sends the response data 1 with a length of 20 milliseconds, and the response data 1 is the data sent by the controlled device 1. The response data 1 is received by the first network node after another 10 milliseconds. The starting time for the first network node to receive the response data 1 is 10+35+10=55 milliseconds, so the time period for the first network node to receive the response data 1 for the first 55 to 74 ms.

According to the reference delay of 55 milliseconds and the delay of the second network node 2 of 12 milliseconds, the starting time of the first time period of the second network node 2 is obtained as 55-2*12=31 milliseconds. The time length of the first time period is 25 milliseconds, that is, the first time period of the second network node 1 is the 31st to 55th milliseconds. The first network node sends the control data 2 to the second network node 1 after a delay of 20 milliseconds, and the second network node 2 sends the control data 2 to the controlled device 2 after 12 milliseconds. After the second network node 2 sends the control data 2, when the delay reaches the 31st millisecond, it sends the response data 2 with a length of 25 milliseconds, and the response data 2 is the data sent by the controlled device 2. The response data 2 is received by the first network node after another 12 milliseconds. The start time for the first network node to receive the response data 2 is 20+12+31+12=75 milliseconds, so the first network node receives the response data 2. The time period is the 75th to 99th milliseconds.

According to the reference delay of 55 milliseconds and the delay of the second network node 3 of 15 milliseconds, the starting time of the first time period of the second network node 3 is obtained as 55-2*15=25 milliseconds. The time length of the first time period is 15 milliseconds, that is, the first time period of the second network node 3 is the 25th to 39th milliseconds. The first network node sends the control data 3 to the second network node 3 after a delay of 45 (20+25) milliseconds, and the second network node 3 sends the control data 3 to the controlled device 3 after 15 milliseconds. After the second network node 3 sends the control data 3, when the delay reaches the 25th millisecond, it sends the response data 3 with a length of 15 milliseconds, and the response data 3 is the data sent by the controlled device 3. The response data 3 is received by the first network node after another 15 milliseconds. The start time of the first network node receiving the response data 3 is 20+25+15+25+15=100 milliseconds, so the first network node receives the response data. The period of 3 is the 100th to 114th milliseconds.

In the above example, the first network node delays sending the control data to each second network node, and the first network node may also send the control data of each second network node without delay. Another example is given next. as described below:

According to the reference delay of 55 milliseconds, the delay of the second network node 2 of 12 milliseconds, and the length of the first time period of the first network node 1 of 20 milliseconds, the starting time of the first time period of the second network node 2 is obtained as 55-2*12+20=51 milliseconds, and the time length of the first time period of the second network node 2 is 25 milliseconds, that is, the first time period of the second network node 2 is the 51st to 75th milliseconds. The first network node sends the control data 2 to the second network node 2 , and after 12 milliseconds, the second network node 2 sends the control data 2 to the controlled device 2 . After the second network node 2 sends the control data 2, when the delay reaches the 51st millisecond, it sends the response data 2 with a length of 25 milliseconds, and the response data 2 is the data sent by the controlled device 2. The response data 2 is received by the first network node after another 12 milliseconds. The start time for the first network node to receive the response data 2 is 12+51+12=75 milliseconds, so the time period for the first network node to receive the response data 2 for the first 75 to 99 ms.

According to the reference delay of 55 milliseconds, the delay of the second network node 3 of 15 milliseconds, the time length of the first time period of the second network node 1 of 20 milliseconds, and the time length of the first time period of the second network node 2 of 25 milliseconds, The start time of obtaining the first time period of the second network node 3 is 55-2*15+20+25=70 milliseconds, and the time length of the first time period of the second network node 3 is 15 milliseconds, that is, the second network The first time period for node 3 is the 70th to 89th milliseconds. The first network node sends the control data 3 to the second network node 3 , and after 15 milliseconds, the second network node 3 sends the control data 3 to the controlled device 3 . After the second network node 3 sends the control data 3, when the delay reaches the 70th millisecond, it sends the response data 3 with a length of 15 milliseconds, and the response data 3 is the data sent by the controlled device 3. The response data 3 is received by the first network node after another 15 milliseconds. The start time for the first network node to receive the response data 3 is 15+70+15=100 milliseconds, so the time period for the first network node to receive the response data 3 for the 100th to 114th ms.

The attribute information of the second network node includes performance parameters of the second network node and/or the distance between the second network node and the first network node.

The performance parameter of the second network node may include one or more of the number of central processing unit (central processing unit, CPU) cores and the CPU processing frequency of the second network node.

Optionally, when the first network node is connected to multiple control devices, the N controlled devices are controlled by one control device, the first network node determines the second time period corresponding to the one control device, and the second The time period includes at least the first time period of each of the M second network nodes. The first network node allocates a different first time period within the second time period to each second network node according to the data amount corresponding to each of the M second network nodes. Alternatively, the first network node allocates a different first time period within the second time period to each second network node according to the attribute information of each second network node and the data amount corresponding to each second network node.

Optionally, the first network node further acquires attribute information of each second network node, and saves the attribute information of each second network node. In this way, when the attribute information of the second network node is used, the stored attribute information of the second network node is directly obtained.

Optionally, for the transmission delay from the first network node to each second network node, the first network node may measure the transmission delay from the first network node to each second network node respectively.

Optionally, for the performance parameter of each second network node, the first network node may query each second network node for the performance parameter of each second network node respectively. Alternatively, the performance parameters of each second network node are pre-configured in the first network node. Or, the first network node acquires the performance parameter of each second network node from the network management device.

For at least one controlled device controlled by other control devices, also according to the operations of the above steps 302 to 303, determine each second network node connected to the at least one controlled device, determine the time period corresponding to the other control device, and Each second network node is allocated a different time period within the time period.

Step 304: For each second network node, the first network node sends a first data frame to the second network node, and the first data frame includes the control data of the controlled device connected to the second network node and the second network node. Configuration information of the first time period of the node.

The configuration information of the first time period is used by the second network node to determine the first time period. The configuration information of the first time period may include information such as the start time and time length of the first time period.

Optionally, in this step, the first network node generates a first data frame, the first data frame includes the control data of each controlled device and the configuration information of the first time period of each second network node, and is sent to each A second network node sends the first data frame. Alternatively, the first network node may generate M first data frames, the M first data frames are in one-to-one correspondence with the M second network nodes, and the payload of the first data frame corresponding to the second network node includes the The control data of the controlled device connected to the second network node and the configuration information of the first time period of the second network node are sent to each second network node. The first data frame corresponding to each second network node is sent to each second network node.

Optionally, the first data frame may be an Ethernet frame, and the first network node uses the control data of each controlled device and the configuration information of the first time period of each second network node as the payload, on the basis of the payload. Add the Ethernet frame header to get the first data frame.

Optionally, the first network node further generates a first check code according to the payload, and the first data frame further includes the first check code.

Optionally, the first network node may use a forward error correction (forward error correction, FEC) mechanism to generate the first check code according to the payload.

For example, referring to FIG. 5 , the first network node receives the control data of the controlled device 1, the control data of the controlled device 2 and the control data of the controlled device 3, and sends the control data of the controlled device 1 to the control data of the controlled device 2. Data and control data of the controlled device 3 and the configuration information of the first time period of the second network node 1, the configuration information of the second network node 2 of the first time period, and the configuration of the second network node 3 of the first time period The information is used as the payload, and the first check data is generated according to the payload, and the first data frame is generated. The first data frame includes the Eth frame header, the control data of the controlled device 1, the control data of the controlled device 2, and the controlled device. 3 of the control data and the first check data. The first data frame is sent to the second network node 1 connected to the controlled device 1 , the second network node 2 connected to the controlled device 2 , and the second network node 3 connected to the controlled device 3 .

Step 305: The second network node receives the control data of the controlled device connected to itself, and sends the control data of the controlled device to the controlled device.

For each of the M second network nodes, the second network node is connected to one or more controlled devices among the N controlled devices. The second network node sends control data of each controlled device to each controlled device connected to itself.

Optionally, when the second network node receives the first data frame, the first data frame includes control data of each of the N controlled devices, and the second network node receives the first data frame from the first data frame. The control data of each controlled device connected to itself is obtained in the data frame, and the control data of each controlled device is respectively sent to each controlled device. When implemented:

For each controlled device, the second network node determines whether the controlled device is connected to itself according to the identifier of the controlled device included in the control data of the controlled device, and if so, obtains the controlled device from the first data frame. Control data of the controlled device and configuration information of its own first time period, send the control data of the controlled device to the controlled device according to the identifier of the controlled device, and determine the first time period according to the configuration information.

Optionally, in the case where the first data frame includes the first check data, the second network node checks the payload of the first data frame according to the first check data. If there is no error in the payload, the second network node obtains the control data of each controlled device connected to itself from the first data frame. If an error is detected in the payload of the first data frame, the second network node discards the first data frame.

Optionally, the second network node uses an FEC mechanism to verify the payload of the first data frame according to the first verification data.

For each controlled device that communicates with the second network node, the controlled device receives control data of the controlled device, and sends response data for the command to the second network node according to the command included in the control data.

For example, assuming that the command is a command for turning on a switch, the response data sent by the controlled device to the second network node is a turn-on success indication message or a turn-on failure indication message. For another example, assuming that the command is a command for closing the switch, the response data sent by the controlled device to the second network node is a closing success indication message or a closing failure indication message. For another example, the command is a positioning command, and the response data sent by the controlled device to the second network node is the location information of the controlled device.

Step 306: The second network node receives the response data of each controlled device connected to itself, and sends the response data of each controlled device to the first network node within the first time period of the second network node.

Optionally, the second network node generates a third data frame, where the third data frame includes response data of each controlled device connected to the second network node, and sends the third data frame to the first network node.

Optionally, the third data frame may be a burst (burst, Bst) frame, and the first network node uses the control data of each controlled device as a payload, and adds a Bst frame header on the basis of the payload to obtain the first data frame. Three data frames.

Optionally, the second network node further generates a second check code according to the payload, and the third data frame further includes the second check code.

Optionally, the second network node may use the FEC mechanism to generate the second check code according to the payload.

For example, referring to FIG. 5 , the second network node 1 receives the response data of the controlled device 1, uses the response data of the controlled device 1 as the payload, generates the second check data 1 according to the payload, and generates the third data frame 1 , the third data frame 1 includes the Bst frame header, the response data of the controlled device 1 and the second check data 1 , and sends the third data frame 1 to the first network node within the first time period of the second network node 1 .

The second network node 2 receives the response data of the controlled device 2, uses the response data of the controlled device 2 as the payload, generates the second check data 2 according to the payload, generates the third data frame 2, and the third data frame 2 The third data frame 2 is sent to the first network node within the first time period of the second network node 2 including the Bst frame header, the response data of the controlled device 2 and the second check data 2 . as well as,

The second network node 3 receives the response data of the controlled device 3, uses the response data of the controlled device 3 as the payload, generates the second check data 3 according to the payload, generates the third data frame 3, and the third data frame 3 The third data frame 3 is sent to the first network node within the first time period of the second network node 3 including the Bst frame header, the response data of the controlled device 3 and the second check data 3 .

Step 307: For each second network node, the first network node receives data sent by the second network node within the first time period of the second network node, and the data sent by the second network node includes data sent by the second network node. The response data of the controlled device connected to the network node.

Optionally, for each second network node in the M second network nodes, the first network node receives the third data frame sent by the second network node, and obtains the data from the third data frame and the second network node. Response data of each controlled device connected to the network node.

For each second network node in the M second network nodes, each second network node transmits a third data frame within a respective first time period. In the first time period of each second network node, the interval between two adjacent first time periods may be small, or zero. Therefore, the first network node can continuously receive the data sequence composed of the third data frames, that is, the data sequence includes a plurality of third data frames.

Optionally, the frame header of the third data frame is a Bst frame header, the Bst frame header includes Bst information, and the Bst frame header of each third data frame includes the same Bst information. Therefore, the first network node can identify each third data frame from the received data sequence based on the Bst information.

Optionally, when the third data frame includes the second check data, the first network node checks the payload of the third data frame according to the second check data. If there is no error in the payload, the first network node obtains the response data with the controlled device from the third data frame. If an error is detected in the payload of the third data frame, the first network node discards the third data frame.

Optionally, the first network node uses an FEC mechanism to verify the payload of the third data frame according to the second verification data.

For example, the first network node receives the third data frame 1, and checks the payload (response data 1 of the controlled device 1) included in the third data frame 1 according to the second check data 1 included in the third data frame 1 , if it is verified that there is no error in the payload of the third data frame 1, the response data 1 of the controlled device 1 is obtained from the third data frame 1.

The first network node receives the third data frame 2, and checks the payload (response data 2 of the controlled device 2) included in the third data frame 2 according to the second verification data 2 included in the third data frame 2. If It is verified that there is no error in the payload of the third data frame 2 , and the response data 2 of the controlled device 2 is obtained from the third data frame 2 . as well as,

The first network node receives the third data frame 3, and checks the payload (response data 3 of the controlled device 3) included in the third data frame 3 according to the second verification data 3 included in the third data frame 3. If It is verified that there is no error in the payload of the third data frame 3 , and the response data 3 of the controlled device 3 is obtained from the third data frame 3 .

Step 308: The first network node sends the response data of each of the N controlled devices to the control device.

In this step, the first network node sends a second data frame to the control device, and the second data frame includes the response data of each controlled device arranged according to the sequence of receiving the response data of each controlled device.

For example, referring to FIG. 5 , assuming that the first network node receives the third data frame 1, the third data frame 2 and the third data frame 3 in sequence, the generated second data frame includes the response data 1 of the controlled device 1, the The response data 2 of the controlling device 2 and the response data 3 of the controlled device 3 are sent to the controlling device, and the second data frame is sent.

Optionally, the second data frame may be an Eth frame, and the first network node uses the response data of each controlled device as a payload, and adds an Eth frame header on the basis of the payload to obtain the second data frame.

In the embodiment of the present application, since the first network node determines M second network nodes connected to the N controlled devices according to the control data of the N controlled devices, and obtains the N controlled devices according to the control data of the N controlled devices For the data volume corresponding to each second network node in the M second network nodes, different first time periods are allocated to each second network node according to the data volume of each second network node. Since each second network node needs to forward the response data of the controlled device and dynamically allocate the first time period to each second network node, each second network node does not need to wait for a long time for the arrival of the respective first time period , thereby reducing the delay in sending data by each second network node. In addition, the length of the first time period of each second network node is allocated based on the amount of data corresponding to each second network node, so as to ensure that the length of time required by each second network node to send response data is equal to that of each second network node. The time length of the first time period of the network node, so that each second network node can send the response data that it needs to send within a first time period, reducing the delay for each second network node to send data and avoid wasting time and resources.

Referring to FIG. 6 , an embodiment of the present application provides an apparatus 500 for sending data. The apparatus 500 may be deployed in the first network node provided in any of the foregoing embodiments, and used in a network including multiple controlled devices, including : processing unit 501, receiving unit 502 and sending unit 503;

a receiving unit 502, configured to receive control data sent by the control device, where the control data is used to control at least one controlled device in the plurality of controlled devices;

A sending unit 503 is configured to send a first data frame to a second network node, where the first data frame includes the control data and configuration information of a first time period, the second network node is connected to at least one controlled device, and the first time period The length of time is determined by the processing unit 501 based on the data volume corresponding to the second network node, and the data volume is equal to the cumulative value of the data volume of the response data that needs to be sent by each controlled device in the at least one controlled device. This configuration The information is used by the second network node to determine the first time period and forward the response data sent by each controlled device during the first time period.

Optionally, for the detailed operation of the processing unit 501 determining the time length of the first time period of the second network node, reference may be made to the relevant content in step 303 of the embodiment shown in FIG. 3 , which will not be described in detail here.

Optionally, the processing unit 501 is used for:

A first time period is allocated to the second network node according to the attribute information of the second network node and the data amount corresponding to the second network node.

Optionally, the attribute information of the second network node includes a performance parameter of the second network node and/or a transmission delay from the second network node to the apparatus 500 .

Optionally, the processing unit 501 is further configured to:

Obtain attribute information of each second network node.

Optionally, the number of control devices connected to the device 500 is multiple, each control device in the multiple control devices corresponds to a different second time period, and the at least one controlled device is one of the multiple control devices. Controlled by one control device, the first time period is located within the second time period corresponding to the one control device.

Optionally, the processing unit 501 is further configured to:

According to the control data, the data volume of the response data that needs to be sent by each controlled device is obtained.

Optionally, for the detailed operation of the processing unit 501 for acquiring the data amount corresponding to the second network node, reference may be made to the relevant content in step 302 of the embodiment shown in FIG. 3 , which will not be described in detail here.

Optionally, the control data includes commands for controlling each controlled device;

The processing unit 501 is configured to acquire, according to the type of the command of each controlled device, the data amount of the response data that each controlled device needs to send.

Optionally, the receiving unit 502 is used to receive the response data of each controlled device sent by the second network node in the first time period of the second network node;

The sending unit 503 is configured to send a second data frame to the control device, where the second data frame includes the response data of each controlled device arranged according to the order of receiving the response data of each controlled device.

Optionally, the number of control devices connected to the device 500 is multiple, each of the multiple control devices corresponds to a different time period, and the N controlled devices are one of the multiple controlled devices. controlled;

The processing unit 501 is configured to allocate to each second network node different time periods within the time period corresponding to the one control device according to the data volume corresponding to each second network node.

In this embodiment of the present application, since the at least one controlled device needs to send response data to the control device, for the second network node connected to the at least one controlled device, the second network node needs to send each response data to the first network node. In this way, when the second network node needs to send data, the processing unit allocates the first time period to the second network node, and the first time period of the second network node is used to send the response data. In addition, it is not necessary to wait for the arrival of the first time period for a long time, which avoids waste of time resources and reduces the delay of sending data. Since the processing unit acquires the data volume corresponding to the second network node, and allocates the first time period to the second network node according to the data volume corresponding to the second network node, this ensures that the first time period of the second network node can be used just for the second network node. The second network node sends data, thereby further avoiding waste of time resources.

Referring to FIG. 7 , an embodiment of the present application provides a schematic diagram of an apparatus 600 for sending data. The apparatus 600 may be the first network node in any of the above embodiments. The apparatus 600 includes at least one processor 601 , internal connections 602 , memory 603 and at least one transceiver 604 .

The apparatus 600 is an apparatus with a hardware structure, and can be used to implement the functional modules in the apparatus 500 described in FIG. 6 . For example, those skilled in the art can think that the processing unit 501 in the apparatus 500 shown in FIG. 6 can be implemented by calling the code in the memory 603 by the at least one processor 601, and the receiving unit 502 and the receiving unit 502 in the apparatus 500 shown in FIG. The sending unit 503 can be implemented by the transceiver 604 .

Optionally, the apparatus 600 can also be used to implement the function of configuring the device in any of the foregoing embodiments.

Optionally, the above-mentioned processor 601 may be a general-purpose central processing unit (central processing unit, CPU), network processor (network processor, NP), microprocessor, application-specific integrated circuit (application-specific integrated circuit, ASIC) , or one or more integrated circuits used to control the execution of the program of this application.

The internal connection 602 described above may include a path to transfer information between the above described components. Optionally, the internal connection 602 is a single board or a bus or the like.

The above transceiver 604 is used to communicate with other devices or communication networks.

The above-mentioned memory 603 can be a read-only memory (read-only memory, ROM) or other types of static storage devices that can store static information and instructions, a random access memory (random access memory, RAM) or other types of storage devices that can store information and instructions. Types of dynamic storage devices, which can also be electrically erasable programmable read-only memory (EEPROM), compact disc read-only memory (CD-ROM), or other optical disk storage, optical disks storage (including compact discs, laser discs, compact discs, digital versatile discs, Blu-ray discs, etc.), magnetic disk storage media or other magnetic storage devices, or capable of carrying or storing desired program code in the form of instructions or data structures and capable of being accessed by Any other medium accessed by the computer, but not limited to this. The memory can exist independently and be connected to the processor through a bus. The memory can also be integrated with the processor.

Wherein, the memory 603 is used for storing the application program code for executing the solution of the present application, and the execution is controlled by the processor 601. The processor 601 is used to execute the application program code stored in the memory 603 and cooperate with at least one transceiver 604, so that the device 600 can realize the functions in the method of the present patent.

In a specific implementation, as an embodiment, the processor 601 may include one or more CPUs, such as CPU0 and CPU1 in FIG. 7 .

In a specific implementation, as an embodiment, the apparatus 600 may include multiple processors, for example, the processor 601 and the processor 607 in FIG. 7 . Each of these processors can be a single-core (single-CPU) processor or a multi-core (multi-CPU) processor. A processor herein may refer to one or more devices, circuits, and/or processing cores for processing data (eg, computer program instructions).

Those of ordinary skill in the art can understand that all or part of the steps of implementing the above embodiments can be completed by hardware, or can be completed by instructing relevant hardware through a program, and the program can be stored in a computer-readable storage medium. The storage medium mentioned may be a read-only memory, a magnetic disk or an optical disk, etc.

The above are only optional embodiments of the present application, and are not intended to limit the present application. Any modifications, equivalent replacements, improvements, etc. made within the principles of the present application shall be included in the protection scope of the present application. Inside.

Claims

A method for sending data, characterized in that the method is applied in a network including a plurality of controlled devices, and the method includes:

The first network node receives control data sent by the control device, where the control data is used to control at least one controlled device in the plurality of controlled devices;

The first network node sends a first data frame to the second network node, the first data frame includes the control data and the configuration information of the first time period, the second network node and the at least one controlled devices are connected, and the time length of the first time period is determined based on the amount of data corresponding to the second network node, and the amount of data is equal to the response that needs to be sent by each of the at least one controlled device The accumulated value of the data amount of the data, and the configuration information is used by the second network node to determine the first time period and forward the response data sent by each controlled device during the first time period.
The method of claim 1, further comprising:

The first network node allocates the first time period to the second network node according to the attribute information of the second network node and the data amount corresponding to the second network node.
The method according to claim 2, wherein the attribute information of the second network node comprises performance parameters of the second network node and/or transmission from the second network node to the first network node time delay.
The method of claim 2 or 3, further comprising:

The first network node acquires attribute information of the second network node.
The method according to any one of claims 2 to 4, wherein the number of control devices connected to the first network node is multiple, and each control device in the multiple control devices corresponds to a different second A time period, the at least one controlled device is controlled by one control device among a plurality of control devices, and the first time period is located within a second time period corresponding to the one control device.
The method of any one of claims 1 to 5, further comprising:

The first network node acquires, according to the control data, the data amount of the response data that needs to be sent by each controlled device.
The method of claim 6, wherein the control data includes commands for controlling each of the controlled devices;

The first network node obtains, according to the control data, the data amount of the response data that each controlled device needs to send, including:

The first network node acquires, according to the type of the command of each controlled device, the data amount of response data that needs to be sent by each controlled device.
The method of any one of claims 1 to 7, further comprising:

receiving, by the first network node, response data of each controlled device sent by the second network node within the first time period;

The first network node sends a second data frame to the control device, where the second data frame includes the response data of each controlled device arranged according to the order in which the response data of each controlled device is received.
An apparatus for sending data, characterized in that the apparatus is applied in a network including a plurality of controlled devices, including: a receiving unit, a sending unit, and a processing unit;

the receiving unit, configured to receive control data sent by the control device, where the control data is used to control at least one controlled device among the plurality of controlled devices;

The sending unit is configured to send a first data frame to a second network node, where the first data frame includes the control data and configuration information of the first time period, the second network node and the at least one The time length of the first time period is determined by the processing unit based on the data volume corresponding to the second network node, and the data volume is equal to each controlled device in the at least one controlled device. The cumulative value of the data volume of response data that the device needs to send, and the configuration information is used by the second network node to determine the first time period and forward the data sent by each controlled device during the first time period. response data.
The apparatus of claim 9, wherein the processing unit is further configured to:

The first time period is allocated to the second network node according to the attribute information of each second network node and the data amount corresponding to each second network node.
The apparatus according to claim 10, wherein the attribute information of the second network node includes a performance parameter of the second network node and/or a transmission delay from the second network node to the apparatus.
The apparatus according to claim 10 or 11, wherein the processing unit is further configured to:

Obtain attribute information of the second network node.
The device according to any one of claims 10 to 12, wherein the number of control devices connected to the device is multiple, and each control device in the multiple control devices corresponds to a different second time period, so The at least one controlled device is controlled by one control device among multiple control devices, and the first time period is within a second time period corresponding to the one control device.
The apparatus of claim 13, wherein the processing unit is further configured to:

According to the control data, the data amount of the response data to be sent by each controlled device is acquired.
15. The apparatus of claim 14, wherein the control data includes commands for controlling each of the controlled devices;

The processing unit is configured to acquire, according to the type of the command of each controlled device, the data amount of the response data that each controlled device needs to send.
The device according to any one of claims 9 to 15, characterized in that,

The receiving unit is further configured to receive the response data of each controlled device sent by the second network node within the first time period;

The sending unit is further configured to send a second data frame to the control device, where the second data frame includes the response of each controlled device arranged according to the order in which the response data of each controlled device is received data.
An apparatus for sending data, characterized by comprising a processor, and the processor executes a program, so that the apparatus executes the method according to any one of claims 1 to 8.
A computer-readable storage medium, characterized in that the computer-readable storage medium stores a program, which, when executed, causes a computer to execute the method according to any one of claims 1 to 8.
A computer program product, characterized in that, the computer program product includes a computer program stored in a computer-readable storage medium, and the computing program is loaded by a processor to implement any one of claims 1-8. method described.