CN113098795A - Reserved bandwidth allocation method and device based on dynamic network in high-speed industrial bus communication system - Google Patents
Reserved bandwidth allocation method and device based on dynamic network in high-speed industrial bus communication system Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
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- H04L47/00—Traffic control in data switching networks
- H04L47/70—Admission control; Resource allocation
- H04L47/72—Admission control; Resource allocation using reservation actions during connection setup
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- H04—ELECTRIC COMMUNICATION TECHNIQUE
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Abstract
The invention relates to a reserved bandwidth allocation method based on a dynamic network in a high-speed industrial bus communication system. According to the bandwidth allocation method and device in the dynamic network disclosed by the invention, the flexible allocation of bandwidth resources to the nodes is realized in the dynamic network according to the types of the nodes. The high-speed industrial communication system is mainly used for solving the problems that the traditional industrial field bus is low in bandwidth, cannot simultaneously bear real time and non-real time and is complex in network structure, can support IPV6 address communication, can support time-triggered industrial control communication, can support TSN, and can support safety mechanisms such as white lists, depth detection, data encryption and the like.
Description
Technical Field
The invention belongs to the field of industrial control and communication, and particularly relates to a reserved bandwidth allocation method and a reserved bandwidth allocation device based on a dynamic network in a high-speed industrial bus communication system.
Background
Current industrial bus systems mainly include fixed networks and dynamic networks. The network in which the number of nodes is fixed, the logical addresses (e.g., MAC, IP addresses) are fixed, the physical locations on the bus are fixed, and the nodes are not allowed to be added or deleted arbitrarily during operation is called a fixed network. Correspondingly, the network in which the number of nodes in the network is variable and the addresses are variable and the nodes are allowed to join and leave in the running process is called a dynamic network.
Currently, a mainstream industrial bus system includes a Controller Area Network (CAN) bus and a Power Link, wherein for bandwidth allocation, the CAN bus allocates communication rights based on priority only, and does not perform quantized reserved bandwidth allocation; the Power Link can perform reserved bandwidth allocation based on a fixed network, but cannot perform reserved bandwidth allocation of a dynamic network, and cannot meet the flexible reserved bandwidth allocation scene of some dynamic networks.
Disclosure of Invention
With the rise of industrial internet and internet of things, people often need to face the requirements of dynamic network scenes, for example, the deployment dynamics and the uncertainty of network nodes (such as nodes of sensor/camera type services) of certain services are normal, and how to flexibly reserve bandwidth allocation in such scenes is a problem to be solved. There is currently no solution to the problems associated with the prior art.
In view of the above problems, the present invention provides a method and an apparatus for allocating bandwidth in a dynamic network under an autonomous underwater vehicle (AUTBUS), which can flexibly allocate bandwidth resources to nodes according to the type of the nodes, that is, the nodes can automatically obtain reserved bandwidth resources according to their own types and established rules after being online.
According to one aspect of the present invention, there is provided a reserved bandwidth allocation method based on a dynamic network in a high-speed industrial bus communication system, comprising:
receiving a request of a node for bandwidth allocation;
determining the type of the node;
judging whether the bandwidth resource meets the requirements of the period and the subframe number corresponding to the type;
and when the bandwidth resource meets the requirements of the period and the subframe number, allocating the bandwidth for the node according to the period and the subframe number.
According to another aspect of the present invention, there is provided a dynamic network-based reserved bandwidth allocation apparatus in a high-speed industrial bus communication system, comprising:
a receiving unit, configured to receive a request for bandwidth allocation by a node;
a determining unit, configured to determine a type to which the node belongs;
a judging unit, configured to judge whether the bandwidth resource meets the requirements of the period and the number of subframes corresponding to the type;
and the allocation unit is used for allocating the bandwidth to the node according to the period and the subframe number when the bandwidth resource meets the requirements of the period and the subframe number.
According to the reserved bandwidth allocation method and device based on the dynamic network in the high-speed industrial bus communication system, bandwidth resources can be flexibly allocated to the nodes according to the types of the nodes.
Drawings
For further clarity of explanation of the features and technical content of the present invention, reference should be made to the following detailed description of the present invention and accompanying drawings, which are provided for reference and description purposes only and are not intended to limit the present invention.
In the following drawings:
fig. 1 is a schematic diagram of a high-speed industrial communication system.
Fig. 2 is a schematic diagram of bandwidth resources and their allocation in a high-speed industrial communication system according to an embodiment of the present invention.
Fig. 3 is a correspondence table of node types, periods, and subframe numbers according to an embodiment of the present invention.
Fig. 4 is a flowchart of a bandwidth allocation method in a dynamic network according to an embodiment of the present invention.
Fig. 5 is a schematic diagram of an embodiment of a reserved bandwidth allocation method based on a dynamic network in a high-speed industrial bus communication system according to the embodiment of the invention.
Fig. 6 is a schematic diagram of another embodiment of a reserved bandwidth allocation method based on a dynamic network in a high-speed industrial bus communication system according to an embodiment of the invention.
Fig. 7 is a schematic diagram of a dynamic network-based reserved bandwidth allocation apparatus in a high-speed industrial bus communication system according to an embodiment of the present invention.
Fig. 8 is a block diagram of an electronic device according to an embodiment of the present invention.
Detailed Description
The embodiments of the present invention disclosed are described below with reference to specific embodiments, and those skilled in the art can understand the advantages and effects of the present invention from the disclosure of the present specification. The invention is capable of other and different embodiments and its several details are capable of modification and various other changes, which can be made in various details within the specification and without departing from the spirit and scope of the invention. The drawings of the present invention are for illustrative purposes only and are not drawn to scale. The following embodiments will further explain the related art of the present invention in detail, but the disclosure is not intended to limit the scope of the present invention.
The high-speed industrial communication system is mainly used for solving the problems that the traditional bus of the industrial field is low in bandwidth, cannot simultaneously bear real time and non-real time and is complex in network structure, can support IPV6 address communication, can support time-triggered industrial control communication, can support TSN, and can support safety mechanisms such as white lists, depth detection, data encryption and the like.
In the embodiment of the invention, the bandwidth allocation method and the bandwidth allocation device under the dynamic network are provided, so that bandwidth resources can be flexibly allocated to nodes according to the types of the nodes, and the requirement of the nodes in the dynamic network for acquiring the bandwidth resources is met.
Fig. 1 is a schematic diagram of a high-speed industrial communication system. As shown in fig. 1, the high-speed industrial communication system is an industrial field bus system which adopts a two-wire non-bridging medium, has multiple nodes, high bandwidth and time sensitivity, is used for automatically controlling the transmission and application of real-time data and non-real-time data of an industrial field such as process control, discrete control and the like, and is compatible with applications such as ISO/IEC/IEEE 8802-3 ethernet and IPv 6. The high-speed industrial communication system has the characteristics of high bandwidth, high real-time performance, long distance and high reliability transmission, is simple to wire and install, provides convenient network maintenance and supports the utilization of the existing cable assets.
The basic reference model of the network architecture of the high-speed industrial communication system is shown in fig. 1. A high-speed industrial communication system can support 254 active nodes, one of which is a Control Node (CN) and the other of which is a Terminal Node (also called a user Node (TN)). The control node is responsible for managing, distributing and recovering system resources, pushing system configuration to all nodes in real time, distributing communication bandwidth and the like. The high-speed industrial communication system uses bus type networking and provides fixed bandwidth data service and variable bandwidth data service supporting burst data in a mode of system pre-configuration or dynamic application; the high-speed industrial communication system can provide reliable and deterministic load bearing for periodically sampled data, bursty control and alarm and IPv4/IPv6 data in an ISO/IEC/IEEE 8802-3 Ethernet grid mode. The high-speed industrial communication system has a high-precision clock synchronization function and provides deterministic data transmission service for time-sensitive and non-time-sensitive services based on time triggering.
Fig. 2 is a schematic diagram of bandwidth resources and their allocation in a high-speed industrial bus communication system according to an embodiment of the present invention. In a high-speed industrial bus communication system, the entire network includes a master node and a slave node, and the entire network performs periodic operations at a fixed time, which is referred to as a frame. The fixed time period can be divided into a plurality of isochronous time slices, which are called sub-frames; each subframe is the most basic communication resource allocation unit, and has the largest communication carrying capacity (number of bytes) according to the system configuration, and is allocated to a specific node for use.
As shown in fig. 2, the entire network includes node a and node B, and it is understood that node a and node B are only an example, and the nodes included in the network are obtained by the network according to actual needs. Node a and node B may be the master node or child nodes. Frame 1 to frame N represent N frames, i.e., N fixed time periods. There are several subframes in each frame, for example, there are subframe 1, subframe 2, and … … in frame 2, each subframe is the most basic unit of communication resource allocation, and bandwidth resources are allocated to a node, which may be expressed as how many subframes are allocated. As shown in fig. 1, the maximum communication carrying capacity configured in each subframe is K bytes.
Based on the high-speed industrial bus communication system, after being connected on the network, each child node can perform interaction of access application with the main node, and after the main node allows access, the child nodes enter an online state; once the child node enters the online state, the subsequent application interaction of bandwidth allocation needs to be continued to the host node to obtain bandwidth resources and realize the communication function.
Taking fig. 2 as an example, assume that a node a is a master node and a node B is a child node, after being connected on a network, each child node B interacts with the master node a for an access application, and after the master node a allows access, the child node B enters an online state; once the child node B enters the online state, the subsequent application interaction of bandwidth allocation needs to be continued to the host node a to obtain bandwidth resources, thereby implementing a communication function.
The above describes the process of the child node applying for obtaining the bandwidth resource from the master node, and for the master node, the obtaining of the bandwidth resource is preset, that is, default. In the following description of the present invention, the process of acquiring bandwidth resources by a child node in a dynamic network is mainly aimed at, so that for the sake of simplicity, the "child node" is hereinafter referred to as a "node".
Fig. 3 is a correspondence table of node types, periods, and subframe numbers according to an embodiment of the present invention. For a node that needs to allocate bandwidth, this node will belong to one node type. As shown in fig. 3, the node types include type a, type B, and type C.
The node type can be determined arbitrarily by a user according to a certain rule, and all possible nodes are classified. The determination of the node type may be based on a variety of factors, such as traffic models of the nodes, traffic real-time indicators, and the like. Fig. 3 only shows that the node types include type a, type B and type C, and it is understood that this is only an example, and the node types include any number of types according to actual needs, which falls within the scope covered by the present application.
In fig. 3, the period represents the interval of the required frame period, and the value thereof may be 1, 2, 4, 8 or any positive integer. A value of 1 indicates that for a node of this type, bandwidth resources are allocated to it for a corresponding number of subframes in consecutive frames, e.g., bandwidth resources are allocated to it in frame 1, frame 2, frame 3 … …; a value of 2 indicates that for a node of this type, bandwidth resources are allocated for it in frames that are one frame apart by a corresponding number of subframes, e.g., bandwidth resources are allocated for it in frames 1, 3, 5 … …. For other cycle values, and so on.
In fig. 3, the number of subframes indicates the number of subframes in the corresponding frame. For example, the number of subframes being 3 indicates that 3 subframes are allocated in one corresponding frame.
Based on the above description, the present invention provides a reserved bandwidth allocation method based on dynamic network in a high-speed industrial bus communication system, as shown in fig. 4, the method includes the following steps:
s401, a request for bandwidth allocation from a node is received.
After the nodes are connected on the network, the nodes enter an online state after the master node allows access. At this time, the node is in an online state, but does not acquire bandwidth resources, and therefore cannot communicate. Then the node sends a request for bandwidth allocation to the master node, and the master node receives the request for bandwidth allocation from the node and allocates bandwidth according to the request from the node.
S402, determining the type of the node.
After receiving a request for allocating bandwidth from a node, the master node needs to determine the type of the definition. The master node may determine the type of the node based on certain rules, for example, as described above, based on a traffic model and a traffic real-time indicator of the node.
For example, for a new node C, it belongs to type a. According to the mapping table of node type, period and number of subframes shown in fig. 3, the period and number of subframes are 1 and 3, respectively.
S403, judging whether the bandwidth resource meets the requirements of the period and the number of the sub-frames corresponding to the type;
as described above, the master node knows the corresponding period and the number of subframes according to the type of the node C. And the main node judges whether the bandwidth resources meet the requirements of the period and the subframe number corresponding to the type.
Fig. 5 is a schematic diagram of an embodiment of a reserved bandwidth allocation method based on a dynamic network in a high-speed industrial bus communication system according to the embodiment of the invention. As shown in fig. 5, for the current frame there are 8 subframes, 4 subframes (shaded) have been allocated, and 4 subframes remain to be allocated. On this frame, the number of subframes required by node C is 3, and C may be allocated 3 subframes.
S404, when the bandwidth resource meets the requirements of the period and the subframe number, allocating bandwidth for the node according to the period and the subframe number.
As shown in fig. 5, if the number of subframes in the current frame satisfies the requirement of node C, 3 subframes are allocated to node C in consecutive frames.
S405, when the bandwidth resource does not meet the requirements of the period and the number of the subframes, the bandwidth is not allocated to the node.
The requirement that the wide resource does not satisfy the period and the number of the sub-frames includes the situation that the requirement does not satisfy the period, the requirement does not satisfy the number of the sub-frames, and the requirement does not satisfy the number of the period and the number of the sub-frames.
Fig. 6 is a schematic diagram of an embodiment of a reserved bandwidth allocation method based on a dynamic network in a high-speed industrial bus communication system according to the embodiment of the invention. As shown in fig. 6, for the current frame, there are 8 subframes, 7 subframes (shaded) are allocated, and 1 subframe is to be allocated. When a new node D needs bandwidth resources, the master node learns that the required period and the required number of subframes are 1 and 4 respectively according to the type of the node D, however, the number of assignable subframes of the current frame is less than 4, so the master node does not assign the bandwidth resources to the node D.
And when the node D does not obtain the bandwidth resources, the node D only keeps the online state, and when the bandwidth resources do not meet the requirements of the period and the number of the subframes, the main node allocates the bandwidth resources for the node D.
According to the reserved bandwidth allocation method based on the dynamic network in the high-speed industrial bus communication system, the bandwidth resources can be flexibly allocated to the nodes according to the types of the nodes, and the requirement that the nodes in the dynamic network acquire the bandwidth resources is met.
According to another embodiment, the invention also provides a device for the reserved bandwidth allocation based on the dynamic network in the high-speed industrial bus communication system. As shown in fig. 7, the apparatus includes:
a receiving unit 701, configured to receive a request for allocating bandwidth from a node.
The node sends a bandwidth allocation request after entering the online state, and the receiving unit 601 receives the bandwidth allocation request from the node and allocates the bandwidth according to the request of the node.
A determining unit 702, configured to determine a type to which the node belongs.
After receiving a request from a node to allocate bandwidth, the type of the definition needs to be determined. The determining unit 702 may determine the type to which the node belongs based on a certain rule, for example, as described above, the type may be based on a traffic model and a service real-time index of the node.
A determining unit 703, configured to determine whether the bandwidth resource meets the requirements of the period and the number of subframes corresponding to the type.
An allocating unit 704, configured to allocate bandwidth to the node according to the period and the subframe number when the bandwidth resource meets the requirements of the period and the subframe number.
The allocating unit 704 is further configured to not allocate bandwidth for the node when the bandwidth resource does not meet the requirements of the period and the number of subframes.
According to the reserved bandwidth allocation device based on the dynamic network in the high-speed industrial bus communication system, bandwidth resources can be flexibly allocated to the nodes according to the types of the nodes, and the requirement that the nodes in the dynamic network acquire the bandwidth resources is met.
Referring to fig. 8, fig. 8 provides an electronic device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, the processor implementing the method and refinement scheme shown in fig. 4 when executing the computer program.
The processor may be a general-purpose processor, such as a central processing unit CPU and an image processing unit GPU, but in practical applications, the processor may also be a neural network dedicated processor, such as a pulse array machine, a machine learning processor, and the like, and of course, the processor may also be a processor combining a general-purpose processor and a neural network dedicated processor, and the present application is not limited to the specific representation form of the processor.
The electronic device may include a data processing apparatus, a robot, a computer, a printer, a scanner, a tablet computer, a smart terminal, a mobile phone, a vehicle data recorder, a navigator, a sensor, a camera, a server, a cloud server, a camera, a video camera, a projector, a watch, an earphone, a mobile storage, a wearable device, a vehicle, a household appliance, and/or a medical device.
The vehicles comprise airplanes, ships and/or vehicles; the household appliances comprise a television, an air conditioner, a microwave oven, a refrigerator, an electric cooker, a humidifier, a washing machine, an electric lamp, a gas stove and a range hood; the medical equipment comprises a nuclear magnetic resonance apparatus, a B-ultrasonic apparatus and/or an electrocardiograph.
Embodiments of the present application also provide a computer-readable storage medium storing a computer program for electronic data exchange, wherein the computer program causes a computer to execute the method and refinement scheme shown in fig. 3.
Embodiments of the present application also provide a computer program product comprising a non-transitory computer readable storage medium storing a computer program operable to cause a computer to perform the method and refinement scheme as shown in fig. 4.
It should be noted that, for simplicity of description, the above-mentioned method embodiments are described as a series of acts or combination of acts, but those skilled in the art will recognize that the present application is not limited by the order of acts described, as some steps may occur in other orders or concurrently depending on the application. Further, those skilled in the art should also appreciate that the embodiments described in the specification are exemplary embodiments and that the acts and modules referred to are not necessarily required in this application.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included therein.
Claims (10)
1. A reserved bandwidth allocation method based on a dynamic network in a high-speed industrial bus communication system comprises the following steps:
receiving a request of a node for bandwidth allocation;
determining the type of the node;
judging whether the bandwidth resource meets the requirements of the period and the subframe number corresponding to the type;
and when the bandwidth resource meets the requirements of the period and the subframe number, allocating the bandwidth for the node according to the period and the subframe number.
2. The method of claim 1, wherein the determining the type to which the node belongs comprises:
and determining the type of the node based on the traffic model and the service real-time performance index of the node.
3. The method of claim 1 or 2, further comprising not allocating bandwidth for the node when the bandwidth resources do not meet the requirements for the period and the number of subframes.
4. The method of claim 1 or 2, wherein the period comprises 1, 2, 4 or 8.
5. A dynamic bandwidth under network allocation device, comprising:
a receiving unit, configured to receive a request for bandwidth allocation by a node;
a determining unit, configured to determine a type to which the node belongs;
a judging unit, configured to judge whether the bandwidth resource meets the requirements of the period and the number of subframes corresponding to the type;
and the allocation unit is used for allocating the bandwidth to the node according to the period and the subframe number when the bandwidth resource meets the requirements of the period and the subframe number.
6. The apparatus of claim 5, wherein the determining unit determines the type to which the node belongs based on a traffic model and a traffic real-time indicator of the node.
7. The apparatus of claim 5 or 6, the allocation unit further configured to not allocate bandwidth for the node when the bandwidth resources do not meet the requirements of the period and the number of subframes.
8. The apparatus of claim 5 or 6, wherein the period comprises 1, 2, 4, or 8.
9. An electronic device, comprising:
a processor;
a memory communicatively coupled to the processor and storing computer instructions that, when executed by the processor, cause the processor to perform the method of any of claims 1-4.
10. A non-transitory computer readable storage medium storing computer instructions that, when executed by a processor, cause the processor to perform the method of any one of claims 1-4.
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Application publication date: 20210709 |
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