KR102220636B1 - Method for frame communication with gate and node field added - Google Patents

Abstract

A communication method for sharing information of all nodes in a ring topology network by exchanging frames including address information of nodes in a ring topology network is provided. In the frame communication method to which the G/N field is added according to an embodiment of the present invention, a node constituting a single ring topology network includes a first field indicating information on a type and a second field in which its own address is written. Generating; And transmitting the frame generated by the node to another node. Thereby,

Description

G/N field-added frame communication method {Method for frame communication with gate and node field added}

The present invention relates to a communication method suitable for a ring topology in which a plurality of gateways are provided, and more particularly, communication for sharing information of all nodes in a ring topology network by exchanging frames including address information of nodes in a ring topology network. It's about how.

In industrial areas that require high reliability, such as aircraft, railways and smart factories, the required performance of data buses for controlling numerous electronic systems has increased.

In particular, protocols such as High-availability Seamless Redundancy (HSR) or AeroRing based on Ethernet technology with excellent reliability and convenience have been developed.

HSR is a ring topology communication technology established in the IEC 62439-3 standard, and as illustrated in FIG. 1, it is characterized by simultaneously transmitting duplicate frames in both directions at all times.

HSR is obligated to send all nodes' information in Supervision frame periodically within a certain period of time. At this time, the destination MAC address of the Supervision frame is 01:15:4e:00:01:xx. Has been.

As shown in FIG. 2, the Supervision frame stores only its own information, and does not transmit MAC address information of other nodes together, but transmits only its own information. Therefore, in order to collect information of all nodes, each node You must receive all the frames you send.

Therefore, the HSR takes a lot of time to collect all the information, and it is difficult to identify whether the node is a gateway or a general terminal. In a ring topology network environment in which a plurality of gateways are provided, not only the identification of the gateway and the general terminal, but also There is a drawback that it cannot be identified between gateways.

Meanwhile, in AeroRing, all nodes in a ring have an automatic network configuration mechanism to share information (mac address) of nodes in the ring.

3A is a diagram illustrating a frame structure for a general local ring network used in a conventional AeroRing. As illustrated in FIG. 3A, in AeroRing, a gateway performs automatic configuration including its own 6-byte MAC address and 12-bit VLAN ID. A frame is generated, and each node that has received this frame adds its own address information (6-byte MAC address) to the back, and delivers the frame by increasing the NBAD, which means the number of addresses.

3B is a diagram illustrating a frame structure for a backbone for gateway nodes in a backbone ring to exchange information within a backbone ring in a conventional AeroRing.As illustrated in FIG. 3B, in AeroRing, the backbone ring uses only VLAN ID, and the frame As it transmits, it transmits 12-bit VLAN ID.

Such, AeroRing's protocol is valid only when there is one gateway, and as illustrated in FIG. 4, in a ring topology network environment in which a plurality of gateways are provided, not only the gateway and the general terminal, but also the gateways cannot be identified. There are drawbacks.

In addition, since there is no information for confirming whether the frame transmitted between nodes is a frame in which information of all nodes has been collected or a frame currently being collected, there is a problem of insufficient certainty in designing a system.

Therefore, in a ring topology network environment in which a plurality of gateways are provided, not only the gateway and the general terminal are identified, but also the identification between the gateways is possible, and the frame transmitted between nodes is a frame in which the information of all nodes has been collected, or the current There is a need to find a way to check whether the frame is being collected.

The present invention was devised to solve the above problems, and an object of the present invention is to exchange frames including information on address information and type information of a node in a ring topology network, and a plurality of gateways are provided. In a ring topology network environment, a frame that not only identifies a gateway and a general terminal, but also enables identification between gateways, and checks whether the frame transmitted between nodes is a frame in which all node information has been collected or is currently being collected. It is to provide a communication method.

In a frame communication method to which a G/N field is added according to an embodiment of the present invention for achieving the above object, a node constituting a single ring topology network has a first field indicating information on a type and its own address. Generating a frame including the created second field; And transmitting the frame generated by the node to another node.

In addition, the single ring topology network is one of the ring topology networks constituting the multi-ring topology network, and the nodes constituting the single ring topology network are of a ring topology network such as two or more gateways connected with gateways of other ring topology networks. It may be composed of one or more terminals connected to other terminals or gateways.

In the step of generating the frame, each node may individually record information on its type in the first field according to whether it is a gateway or a terminal.

In addition, in the step of generating the frame, each node may add a control field indicating information about the type of the ring topology to which it is connected to the generated frame, the transmission direction of the frame, and whether the transmission path is completed.

In the step of generating the frame, when the gateway of the nodes obtains information on the type of the other person, the gateway may record information on the type of the other person together with the information on the own type in the first field.

In addition, in the step of generating the frame, each node may write its own address in the second field in a TLV (Type-Length-Value) format.

In addition, at least two different types of INTEGER, OCTET STRING, and BIT STRING may be applied to the second field created in the TLV format.

In addition, each node may add identification information capable of identifying which format among INTEGER, OCTET STRING, and BIT STRING is applied to the second field to the head of its own address.

And, in the step of generating the frame, when each node adds a VLID field indicating a VLAN ID value to the generated frame, the TLV format applied to the second field according to the number of bytes required according to the VLAN ID value is INTEGER, It can be determined as one of OCTET STRING and BIT STRING.

Meanwhile, a frame communication system to which a G/N field is added according to another embodiment of the present invention is provided in a node constituting a single ring topology network, and a first field indicating information on a type and a second A processor that generates a frame including a field; And a communication unit provided in a node constituting a single ring topology network and transmitting the generated frame to another node.

As described above, according to embodiments of the present invention, information of all nodes in a ring topology network is shared, and in a ring topology network environment in which a plurality of gateways are provided, not only the gateway and the general terminal are identified, but also between the gateways. Identification is possible, and it is possible to check whether a frame transmitted between nodes is a frame in which information of all nodes has been collected or a frame currently being collected, thereby enabling the implementation of an extended network than before.

According to the embodiments of the present invention, by enabling a network of a multi-ring structure in which a plurality of gateways are provided, rapid delivery of messages and stable delivery of messages are possible, thereby implementing a system with higher reliability than the conventional one.

1 is a diagram provided in the description of a conventional HSR,
2 is a diagram provided to explain the structure of a conventional HSR Supervision frame;
3 is a diagram provided to explain the structure of a conventional AeroRing message;
4 is a diagram illustrating a ring network connected by two gateways;
5 is a diagram provided to explain a frame structure applied to a frame communication method according to an embodiment of the present invention;
6 is a diagram provided to explain a frame structure applied to a frame communication method according to another embodiment of the present invention;
7 is a diagram provided in the description of a method of encoding Integer with BER;
8 is a diagram illustrating a ring topology network applied to a frame communication method according to an embodiment of the present invention;
9 is a diagram illustrating identification information for identifying a TLV format applied to a field indicating an address;
10 is a flowchart provided to explain a frame communication method according to an embodiment of the present invention, and
11 is a block diagram provided to explain a frame communication system according to an embodiment of the present invention.

Hereinafter, the present invention will be described in more detail with reference to the drawings.

5 is a diagram provided to explain a frame structure applied to a frame communication method according to an embodiment of the present invention.

The frame communication method according to an embodiment of the present invention exchanges frames including information on address information and type information of nodes in a ring topology network, and in a ring topology network environment in which a plurality of gateways are provided, In addition to identifying a general terminal, it is possible to identify between gateways, and it is possible to check whether a frame transmitted between nodes is a frame in which information of all nodes has been collected or a frame currently being collected.

To this end, a node constituting a single ring topology network equipped with a plurality of gateways includes a first field indicating information on the type, a second field in which its own address is written, and the type of the ring topology connected to the generated frame. , A frame including a control field indicating information on the forwarding direction of the frame and whether or not the forwarding path is completed may be generated and transmitted to another node.

Here, the single ring topology network is one of the ring topology networks constituting the multi-ring topology network, and the nodes constituting the single ring topology network are of a ring topology network such as two or more gateways connected to gateways of other ring topology networks. It may be composed of one or more terminals connected to other terminals or gateways.

In the first field, each node may individually record information on its own type according to whether it is a gateway or a terminal.

For example, if information on the type of the other person is obtained from the node, the gateway may record information on the type of the other person together with the information on the own type in the first field.

In the second field, each node may write its own address in a TLV (Type-Length-Value) format.

For example, in the second field created in the TLV format, at least two or more different formats of INTEGER, OCTET STRING, and BIT STRING may be applied.

The control field is a Type of Ring area to which information on the type of a ring topology connected to the frame is added to the generated frame as illustrated in FIG. 5, a Direction area to which information on the transmission direction of the frame is added, and information of all nodes. Is collected, and may include a Done area to check whether the automatic configuration of the single ring topology network has been completed or is being collected.

At this time, when the type of ring is a local ring, the size of the ADDR will be 6 bytes, and when the type of ring is a backbone ring, the size of the ADDR will be 2 bytes to record the VLAN ID (12 bits).

And, depending on the size of the ring network, the value of NBAD may be 1 or 2. In case of 1, a maximum of 254 nodes can exist in the ring. If you need more nodes than that, you can set the NBAD value to 2. This can be determined by the system designer.

The VLID following the control field will carry the VLAN ID value of the ring network in which this frame is being exchanged.

6 is a diagram provided to explain a frame structure applied to a frame communication method according to another embodiment of the present invention, and FIG. 7 is a diagram provided to explain a method of Integer encoding with BER.

6 to 7, the frame communication method according to the present embodiment applies a frame format usable in a ring topology network in which a plurality of gateways exist, so that a general terminal other than a gateway automatically configures the ring topology network. You can create a frame for it and deliver it to other nodes.

At this time, a first field may be added and stored in the second field to which each address value is added, and the first field includes information about the own type as a status value of 1 byte, and the type The information for this is information that enables to distinguish whether this address is a general terminal, a gateway of a local ring, or a backbone gateway.

The format of the address information added to the second field is recorded in the tag number. Various TLV formats can be used according to this information. For example, among TLV formats, Integer format can be used, and String format can also be used.

And this address information is encoded by the ITU-T X.690 BER (Basic Encoding Rule). This data encoding method can be extended by methods such as CER, DER, PER, XER, and the like, but will be described on the assumption that the BER data encoding method is applied in this embodiment.

Tag class is used by selecting one of the values from 0 to 3, and in the case of P/C, all of them are primitive types, so they can have a value of 0.

When each node adds a VLID field indicating the VLAN ID value to the generated frame, the TLV format applied to the second field is one of INTEGER, OCTET STRING, and BIT STRING according to the number of bytes required according to the VLAN ID value. Can be determined.

Specifically, if a 12-bit VLAN ID is recorded in Integer (tag = 2) format and encoded with BER, a maximum of 3 bytes of data is required.

If the VLAN ID is less than 80h (128), it can be expressed as 1 byte. If the VLAN ID is between 80h (128) and 255, it can be expressed as 1 byte.

In this case, the number expression method in case of BER encoding is as illustrated in FIG. 7.

If you want to express the 6-byte MAC address in Integer (tag = 2) format, it is appropriate to express the MAC address in Octet String (tag = 4) because a total of 7 bytes are required considering BER encoding.

8 is a diagram illustrating a ring topology network applied to a frame communication method according to an embodiment of the present invention, and FIG. 9 is a diagram illustrating identification information for identifying a TLV format applied to a field indicating an address.

8 to 9, each node has a tag corresponding to the head of its own address among the second field with identification information that can identify which type of INTEGER, OCTET STRING, and BIT STRING is applied to the second field. It can be recorded in the number area.

As illustrated in FIG. 8, two gateways (Gw1, Gw2) and eight general terminals (T1, T3, T4, T6, T7, T8, T9, T10) out of 10 nodes constituting a single ring topology network , Two or more types of INTEGER, OCTET STRING, and BIT STRING may be applied to each other, and at this time, identification information capable of identifying which type is applied may be represented as illustrated in FIG. 9. In addition, addresses added to the second field may be applied in various TLV formats.

10 is a flowchart provided to explain a frame communication method according to an embodiment of the present invention.

Referring to FIG. 10, in the frame communication method according to an embodiment of the present invention, when each node receives a frame (S1010-Y), by checking the Done area of the control field of the frame, automatic configuration of a single ring topology network It is determined whether this is completed or is being collected (S1020), and if it is determined that information of nodes is being collected according to the determination (S1020-N), the type of itself in the first field and the second field of the received frame The information about and its own address may be recorded, and transmitted to another node through a port different from that of the pod that received the frame (S1030).

And, when it is determined that the automatic configuration of the single ring topology network is completed (S1020-Y), it updates its own FDB (forwarding database) using the information of the received frame (S1040).

11 is a block diagram provided to explain a frame communication system according to an embodiment of the present invention.

The processor 100 may be provided in a node constituting a single ring topology network, and may generate a frame including a first field indicating information on a type and a second field in which its own address is written.

Further, the processor 100 may be connected to the communication unit 200 through an internal or external MAC controller, and may transmit/receive a frame by separating the Ethernet ports A and B of the communication unit.

The communication unit 200 is provided at each node in which the processor 100 is provided, and includes Ethernet ports A and B, so that a frame can be transmitted to other nodes in both directions.

The Ethernet port is composed of an Ethernet transceiver IC component, etc., each of which is connected to the processor or MAC controller 400 through a medium independent interface.

The storage unit 300 is a storage medium provided in each node constituting a ring topology network and providing a storage space necessary for the processor 100 to operate. For example, the storage unit 300 may store a forwarding database (FDB).

The MAC controller 400 is connected through a processor and a peripheral device interface.

When the MAC controller 400 is internal, it may be connected through a bus system such as AXI, and when externally, it may be connected through an interface such as PCI Express.

Meanwhile, it goes without saying that the technical idea of the present invention can be applied to a computer-readable recording medium containing a computer program that performs functions of the apparatus and method according to the present embodiment. Further, the technical idea according to various embodiments of the present disclosure may be implemented in the form of a computer-readable code recorded on a computer-readable recording medium. The computer-readable recording medium can be any data storage device that can be read by a computer and can store data. For example, a computer-readable recording medium may be a ROM, RAM, CD-ROM, magnetic tape, floppy disk, optical disk, hard disk drive, or the like. Also, a computer-readable code or program stored in a computer-readable recording medium may be transmitted through a network connected between computers.

In addition, although the preferred embodiments of the present invention have been illustrated and described above, the present invention is not limited to the specific embodiments described above, and the technical field to which the present invention belongs without departing from the gist of the present invention claimed in the claims. In addition, various modifications are possible by those of ordinary skill in the art, and these modifications should not be individually understood from the technical spirit or prospect of the present invention.

100: processor
200: communication department
300: storage
400: MAC (Media Access Control) controller

Claims (10)

Generating, by a node constituting a single ring topology network, a frame including a first field indicating information on a type and a second field in which its own address is written; And
Including; transmitting the frame generated by the node to another node,
A single ring topology network,
It is one of the ring topology networks constituting a multi-ring topology network,
The nodes constituting a single ring topology network are:
It is composed of one or more terminals connected to other terminals or gateways in the same ring topology network, such as two or more gateways connected to gateways of other ring topology networks,
The steps of creating a frame are:
Each node individually records information on its type in the first field according to whether it is a gateway or a terminal,
The steps of creating a frame are:
Frame communication with a G/N field, characterized in that each node adds a control field indicating information on the type of the ring topology to which it is connected, the forwarding direction of the frame, and whether or not the forwarding path is completed. Way.
delete delete delete The method according to claim 1,
The steps of creating a frame are:
A frame communication method with a G/N field appended, characterized in that when a gateway among nodes acquires information on the type of another person, it records information on the type of the other person together with the information on its own type in a first field .
The method according to claim 1,
The steps of creating a frame are:
Each node writes its own address in a second field in a TLV (Type-Length-Value) format. A frame communication method with a G/N field added thereto.
The method of claim 6,
The second field written in TLV format,
Frame communication method with G/N field added, characterized in that at least two different types of INTEGER, OCTET STRING, and BIT STRING are applied.
The method of claim 7,
Each node
A frame communication method in which a G/N field is added, characterized in that the identification information capable of identifying which of INTEGER, OCTET STRING, and BIT STRING is applied to the second field is added to the head of the own address.
The method of claim 6,
The steps of creating a frame are:
When each node adds a VLID field indicating the VLAN ID value to the generated frame, the TLV format applied to the second field is one of INTEGER, OCTET STRING, and BIT STRING according to the number of bytes required according to the VLAN ID value. A frame communication method to which a G/N field is added, characterized in that it is determined.
A processor provided in a node constituting a single ring topology network and generating a frame including a first field indicating information on a type and a second field in which its own address is written; And
Includes; a communication unit provided in a node constituting a single ring topology network and transmitting the generated frame to another node,
A single ring topology network,
It is one of the ring topology networks constituting a multi-ring topology network,
The nodes constituting a single ring topology network are:
It is composed of one or more terminals connected to other terminals or gateways in the same ring topology network, such as two or more gateways connected to gateways of other ring topology networks,
Each node,
Individually records information on its type in the first field according to whether it is a gateway or a terminal,
Each node,
A frame communication system to which a G/N field is added, characterized in that a control field indicating information on a type of a ring topology to which it is connected, a transmission direction of the frame, and whether a transmission path is completed or not is added to the generated frame.

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