WO2022080706A1

WO2022080706A1 - Communication network system and method for controlling same

Info

Publication number: WO2022080706A1
Application number: PCT/KR2021/013245
Authority: WO
Inventors: 이영수; 김병정; 서영교; 임재용
Original assignee: 주식회사 한국금융솔루션
Priority date: 2020-10-13
Filing date: 2021-09-28
Publication date: 2022-04-21
Also published as: KR102367017B1

Abstract

The present invention relates to a communication network system and a method for controlling same. The communication network system of the present invention comprises a plurality of nodes and a server that controls the plurality of nodes, wherein the server is characterized by requesting synchronization information from the plurality of nodes, and on the basis of a booting time included in the synchronization information received from the plurality of nodes, setting any one of the plurality of nodes as a leader node, and the leader node is characterized by transmitting, to the remaining nodes excluding the leader node among the plurality of nodes, notification information indicating that it is the leader node.

Description

Communication network system and its control method

The present invention relates to a communication network system and a control method thereof, and more particularly, to a communication network system based on MQTT (Message Queue for Telemetry Transport) and a control method thereof.

As the IoT device industry market rapidly expands in line with the rapid development of Internet of Things (IoT) technology, the importance of IoT gateways and servers that can conveniently manage and use IoT devices is emerging.

Currently, various studies on efficient gateways and server systems for IoT devices are being actively conducted. However, in the actual application environment, most gateways do not have public IPs, so communication from the server to the gateway is difficult.

To solve this problem, MQTT messaging protocol (MQ Telemetry Transport), a machine-to-machine (M2M) "Internet of Things" connectivity protocol, is widely used.

However, MQTT protocol is a protocol of publish/subscribe structure based on message broker, unlike the communication model of Request and Response. Due to the characteristics of this structure, the message sender cannot determine whether the last message receiver has received the message.

To solve this problem, a two-way MQTT communication model is used in which each message sender uses the function of publish/subscribe.

However, in order for the IoT server to support bidirectional MQTT, the communication connection between the IoT server and the MQTT server must be maintained continuously.

When such a model is adopted, problems such as system resource waste and performance degradation may occur when a server that processes a large amount of data performs multiple requests.

Recently, technology development for providing a high availability service (High Availability) when operating low-power equipment with a lightweight protocol based on MQTT is being actively developed.

An object of the present invention for solving the above-described problems is to provide a communication network system capable of providing a high availability service and a control method thereof.

The problems to be solved by the present invention are not limited to the problems mentioned above, and other problems not mentioned will be clearly understood by those skilled in the art from the following description.

A communication network system according to the present invention for solving the above problems includes a plurality of nodes and a server for controlling the plurality of nodes, wherein the server requests synchronization information from the plurality of nodes, and the plurality of Any one of the plurality of nodes is set as a leader node based on a booting time included in the synchronization information received from the node, wherein the leader node is configured with the exception of the leader node among the plurality of nodes. It is characterized in that it transmits notification information indicating that it is a leader node to the remaining nodes.

In this case, the server, based on the connection of the plurality of nodes to the server, it is characterized in that the request information for requesting the synchronization information is transmitted to the plurality of nodes.

In addition, the synchronization information includes information on booting time, and the server is characterized in that the node having the fastest booting time included in the synchronization information received from the plurality of nodes is set as the leader node.

In addition, the server periodically receives synchronization information from the plurality of nodes, and determines activation states of the plurality of nodes based on the received synchronization information.

In addition, in the synchronization information, an effective time is set, and the server deletes the synchronization information in which the effective time has elapsed.

In addition, the server may control the leader node to periodically transmit notification information indicating that it is a leader node in order to prevent setting of at least two leader nodes among the plurality of nodes.

In addition, when a plurality of pieces of notification information are received, the remaining nodes determine whether the received plurality of pieces of notification information match.

In addition, when the plurality of pieces of notification information do not match, the remaining nodes request that the server transmit request information for requesting synchronization information to the plurality of nodes.

In addition, the control method of a communication network system according to the present invention is a control method of a communication network system including a plurality of nodes and a server controlling the plurality of nodes, the server requesting synchronization information to the plurality of nodes , setting, by the server, any one of the plurality of nodes as a leader node based on a booting time included in the synchronization information received from the plurality of nodes, and the leader node is the leader among the plurality of nodes and transmitting notification information indicating that the node is a leader node to the remaining nodes except for the node.

A computer program providing a control method of a communication network system according to the present invention for solving the above problems is stored in a computer-readable recording medium in combination with a computer that is hardware to perform any one of the methods described above. .

In addition to this, another method for implementing the present invention, another system, and a computer-readable recording medium for recording a computer program for executing the method may be further provided.

According to the present invention as described above, it is possible to provide a new communication network system capable of providing a high availability service.

In addition, according to the present invention, it is possible to prevent the occurrence of a plurality of leader nodes, thereby preventing communication confusion.

Effects of the present invention are not limited to the effects mentioned above, and other effects not mentioned will be clearly understood by those skilled in the art from the following description.

1 and 2 are conceptual diagrams for explaining the MQTT protocol of the present invention.

3 is a conceptual diagram for explaining a communication network system of the present invention.

4 is a flowchart for explaining a control method of a communication network system according to the present invention.

Advantages and features of the present invention and methods of achieving them will become apparent with reference to the embodiments described below in detail in conjunction with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, but may be implemented in various different forms, and only the present embodiments allow the disclosure of the present invention to be complete, and those of ordinary skill in the art to which the present invention pertains. It is provided to fully understand the scope of the present invention to those skilled in the art, and the present invention is only defined by the scope of the claims.

The terminology used herein is for the purpose of describing the embodiments and is not intended to limit the present invention. In this specification, the singular also includes the plural unless specifically stated otherwise in the phrase. As used herein, “comprises” and/or “comprising” does not exclude the presence or addition of one or more other components in addition to the stated components. Like reference numerals refer to like elements throughout, and "and/or" includes each and every combination of one or more of the recited elements. Although "first", "second", etc. are used to describe various elements, these elements are not limited by these terms, of course. These terms are only used to distinguish one component from another. Accordingly, it goes without saying that the first component mentioned below may be the second component within the spirit of the present invention.

Unless otherwise defined, all terms (including technical and scientific terms) used herein will have the meaning commonly understood by those of ordinary skill in the art to which this invention belongs. In addition, terms defined in a commonly used dictionary are not to be interpreted ideally or excessively unless specifically defined explicitly.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

Before the description, the meaning of the terms used in this specification will be briefly described. However, it should be noted that, since the description of the term is for the purpose of helping the understanding of the present specification, it is not used in the meaning of limiting the technical idea of the present invention unless explicitly described as limiting the present invention.

In this specification, 'server' and 'node' include various devices capable of providing results to users by performing computational processing. For example, 'server' and 'node' are not only desktop PCs and notebooks (Note Book), but also smartphones, tablet PCs, cellular phones, and PCS phones (Personal Communication Service). phone), a synchronous/asynchronous IMT-2000 (International Mobile Telecommunication-2000) mobile terminal, a Palm Personal Computer (PC), and a Personal Digital Assistant (PDA).

MQTT stands for lightweight Publish/Subscribe (Pub/Sub) messaging protocol. It is mainly used in Machine-to-Machine (M2M) and Internet of Things (IoT).

MQTT is designed for use in low power and low bandwidth environments for IoT.

MQTT has the advantage of being able to operate on a low power, unreliable network, and No TCP/IP basis. It is advantageous for controlling small devices and collecting sensor information.

Meanwhile, referring to FIG. 1 , the MQTT protocol publishes a message and subscribes to a topic of interest as a basic principle.

Publisher (hereinafter referred to as "Pub") and Subscriber (hereinafter referred to as "Sub") both act as clients to the Broker. Pub connects to the broker server for the purpose of publishing a topic, and sub for the purpose of subscribing to a topic.

One or more Pubs and Subs can be configured to connect to a broker to publish or subscribe to topics.

Also, multiple clients may subscribe to one topic.

In general, Pubs and Subs can work based on topics. Topics can be hierarchically structured using forward slashes (/), and through this, a large number of sensor devices can be efficiently managed.

Meanwhile, referring to FIG. 2 , MQTT may be used as a message bus system.

If the MQTT broker creates a message bus (or channel) and sends a message to it, the method in which applications attached to the bus read the message can be applied.

Messages of various topics can flow in the message bus, and a message channel named "Topic" can be formed to distinguish messages.

Applications can subscribe (Sub) or publish (Pub) messages by connecting to the message bus and registering interested topics.

Meanwhile, referring to FIG. 3 , the communication network system to which MQTT of the present invention is applied includes a plurality of nodes including at least one MQTT message bus (or MQTT channel), and interacts with the plurality of nodes, A server LB that controls a plurality of nodes may be included.

In each node (Node-1, Node-2), a plurality of MQTT message channels or a plurality of MQTT message buses may be formed.

As shown in FIG. 3 , when describing a communication network system according to an embodiment of the present invention, each node may maintain a user's private channel (MQTT Topic).

Messages sent to the private channel are transmitted to the Global Message Proc (hereinafter referred to as GMP). GMP can load this message into Message Queue. At this time, by checking the user connection table, it is possible to find out which node the user is in.

On the other hand, the message receiver may not be connected at the time of message transmission. In this case, the GMP may transmit the message to the user message box.

A newly connected user can perform the process of checking whether there are unread messages in the message box.

Meanwhile, a plurality of nodes and a server included in the communication network system of the present invention may form one cluster, and the server may control the plurality of nodes in various ways.

For example, in the communication network system of the present invention, in order to provide a high-availability service, the leader node may be configured so that information systems such as servers, networks, and programs can continuously operate normally for a fairly long period of time.

First, the communication network system of the present invention may include a plurality of nodes and a server controlling the plurality of nodes.

The server may request (SyncReq) synchronization information from a plurality of nodes (S410). Each node receiving the synchronization information request may transmit synchronization information (Sync information) from the node to the server.

The received synchronization information may be stored in the server.

The server may transmit request information SyncReq for requesting synchronization information to the plurality of nodes based on the connection of the plurality of nodes to the server.

In the present invention, the server sets any one of the plurality of nodes as the leader node based on the booting time included in the synchronization information received from the plurality of nodes (S420).

Specifically, the synchronization information Sync may include information about a boot time of each node.

Specifically, the server may set a node having the fastest (or earliest or shortest) boot time included in the synchronization information received from the plurality of nodes as the leader node.

Meanwhile, the server may periodically receive synchronization information from a plurality of nodes, and determine activation states of the plurality of nodes based on the received synchronization information.

For example, the server may periodically transmit request information for requesting synchronization information to a plurality of nodes.

In this case, the server may determine which node among the plurality of nodes is in an active state and which node is in an inactive state based on the received synchronization information.

For example, the server may determine that a node from which synchronization information has been received is in an activated state, and a node from which synchronization information has not been received may be determined to be inactive.

The synchronization information includes information on the node (eg, identification information, ID, etc.), and the server may identify the node that has transmitted the received synchronization information based on the information on the node.

Meanwhile, in the synchronization information, an effective time (Time to Limit, TTL) may be set.

The server may delete the expired synchronization information to secure capacity.

Meanwhile, the server included in the communication network system of the present invention may prevent at least two leader nodes among a plurality of nodes from being set.

To this end, in the present invention, the step of the leader node transmitting notification information indicating that it is a leader node to the remaining nodes excluding the leader node among the plurality of nodes is performed (S430).

Specifically, the server of the present invention may control the leader node to periodically transmit notification information (or leader information) informing that it is a leader node in order to prevent at least two leader nodes from being set among a plurality of nodes. .

Meanwhile, even without the control of the server, the node set as the leader node may periodically transmit information indicating that it is the leader node to the remaining nodes (ie, the remaining nodes excluding the leader node among the plurality of nodes).

Also, information indicating that it is a leader node may be transmitted to the server.

Meanwhile, when a plurality of pieces of notification information (a plurality of leader information) are received, the remaining nodes excluding the leader node among the plurality of nodes may determine whether the received pieces of notification information match.

The plurality of notification information may be simultaneously received from different nodes at the same time, or may be received from one node at different times.

If a plurality of pieces of notification information are simultaneously received from different nodes in the same time zone, the plurality of pieces of notification information may not be identical to each other. This is because it means a situation in which different nodes inform that each is a leader node.

The remaining nodes may request that the server transmit request information for requesting synchronization information to the plurality of nodes when a plurality of pieces of notification information do not match. That is, when the plurality of pieces of notification information do not match, the remaining nodes may request the server to transmit request information syncReq for requesting synchronization information to the plurality of nodes to perform the process of setting the leader node again.

Meanwhile, even when the leader node receives notification information (leader information) from another node, the leader node may request that the server transmit request information for requesting synchronization information to a plurality of nodes.

As another example, even when the remaining nodes (worker nodes) except the leader node receive notification information indicating that the node is a leader node, since the node is not a leader node, the node that transmitted the notification information is the leader It can be determined that the node is misunderstood.

Even in this case, the corresponding node may request that the server transmit request information for requesting synchronization information to a plurality of nodes.

Thereafter, the server may newly receive synchronization information from a plurality of nodes, and set (select) the leader node again based on the boot time included in the synchronization information.

Meanwhile, when a plurality of pieces of notification information are received at different times and the plurality of pieces of notification information match, the remaining node may determine that only one node is set as a leader node.

When the connection of the plurality of nodes to the server is terminated, the server may delete (or initialize) synchronization information of the node whose connection is terminated.

The method according to an embodiment of the present invention described above may be implemented as a program (or application) to be executed in combination with a server, which is hardware, and stored in a computer-readable recording medium.

The above-described program is C, C++, JAVA, machine language, etc. that a processor (CPU) of the computer can read through a device interface of the computer in order for the computer to read the program and execute the methods implemented as a program It may include code (Code) coded in the computer language of Such code may include functional code related to a function defining functions necessary for executing the methods, etc., and includes an execution procedure related control code necessary for the processor of the computer to execute the functions according to a predetermined procedure. can do. In addition, the code may further include additional information necessary for the processor of the computer to execute the functions or code related to memory reference for which location (address address) in the internal or external memory of the computer to be referenced. there is. In addition, when the processor of the computer needs to communicate with any other computer or server located remotely in order to execute the above functions, the code uses the communication module of the computer to determine how to communicate with any other computer or server remotely. It may further include a communication-related code for whether to communicate and what information or media to transmit and receive during communication.

The storage medium is not a medium that stores data for a short moment, such as a register, a cache, a memory, etc., but a medium that stores data semi-permanently and can be read by a device. Specifically, examples of the storage medium include, but are not limited to, ROM, RAM, CD-ROM, magnetic tape, floppy disk, and an optical data storage device. That is, the program may be stored in various recording media on various servers accessible by the computer or in various recording media on the computer of the user. In addition, the medium may be distributed in a computer system connected to a network, and a computer-readable code may be stored in a distributed manner.

The steps of a method or algorithm described in relation to an embodiment of the present invention may be implemented directly in hardware, as a software module executed by hardware, or by a combination thereof. A software module may contain random access memory (RAM), read only memory (ROM), erasable programmable ROM (EPROM), electrically erasable programmable ROM (EEPROM), flash memory, hard disk, removable disk, CD-ROM, or It may reside in any type of computer-readable recording medium well known in the art to which the present invention pertains.

In the above, embodiments of the present invention have been described with reference to the accompanying drawings, but those of ordinary skill in the art to which the present invention pertains can realize that the present invention can be embodied in other specific forms without changing the technical spirit or essential features thereof. you will be able to understand Therefore, it should be understood that the embodiments described above are illustrative in all respects and not restrictive.

Claims

a plurality of nodes; and

A server for controlling the plurality of nodes,

The server is

request synchronization information to the plurality of nodes,

Based on the boot time included in the synchronization information received from the plurality of nodes, any one of the plurality of nodes is set as a leader node,

The leader node is

and transmitting notification information indicating that it is a leader node to the remaining nodes except for the leader node among the plurality of nodes.
The method of claim 1,

The server is

and transmitting request information for requesting the synchronization information to the plurality of nodes based on the connection of the plurality of nodes to the server.
3. The method of claim 2,

The synchronization information includes information on boot time,

The server is

and a node having the fastest booting time included in the synchronization information received from the plurality of nodes is set as the leader node.
3. The method of claim 2,

The server is

A communication network system, characterized in that periodically receiving synchronization information from the plurality of nodes, and determining activation states of the plurality of nodes based on the received synchronization information.
4. The method of claim 3,

The synchronization information further includes information about the effective time,

The server is

and deleting the synchronization information whose valid time has elapsed.
The method of claim 1,

The server is

In order to prevent at least two leader nodes from being set among a plurality of nodes, the communication network system according to claim 1, wherein the leader node is controlled to periodically transmit notification information indicating that it is a leader node.
3. The method of claim 2,

The remaining nodes are

When a plurality of pieces of notification information are received, the communication network system, characterized in that it is determined whether the received plurality of pieces of notification information match.
8. The method of claim 7,

The remaining nodes are

When the plurality of pieces of notification information do not match, the server requests to transmit request information for requesting synchronization information to the plurality of nodes.
A method of controlling a communication network system comprising a plurality of nodes and a server controlling the plurality of nodes,

requesting, by the server, synchronization information from a plurality of nodes;

setting, by the server, any one of the plurality of nodes as a leader node based on a booting time included in the synchronization information received from the plurality of nodes; and

and transmitting, by the leader node, notification information indicating that the leader node is a leader node to the remaining nodes other than the leader node among the plurality of nodes.
10. The method of claim 9,

The server is

The method of controlling a communication network system, characterized in that, based on the connection of the plurality of nodes to the server, request information for requesting the synchronization information is transmitted to the plurality of nodes.
11. The method of claim 10,

The synchronization information includes information on boot time,

The server is

The control method of a communication network system, characterized in that the node having the fastest booting time included in the synchronization information received from the plurality of nodes is set as the leader node.
11. The method of claim 10,

The server is

A method for controlling a communication network system, characterized in that periodically receiving synchronization information from the plurality of nodes, and determining activation states of the plurality of nodes based on the received synchronization information.
12. The method of claim 11,

The synchronization information further includes information about the effective time,

The server is

The method of controlling a communication network system, characterized in that the synchronization information for which the valid time has elapsed is deleted.
10. The method of claim 9,

The server is

A method for controlling a communication network system, comprising: controlling the leader node to periodically transmit notification information indicating that it is a leader node in order to prevent setting of at least two leader nodes among a plurality of nodes.
11. The method of claim 10,

The remaining nodes are

When a plurality of pieces of notification information are received, the control method of a communication network system, characterized in that it is determined whether the received plurality of pieces of notification information match.
16. The method of claim 15,

The remaining nodes are

When the plurality of pieces of notification information do not match, the server requests to transmit request information for requesting synchronization information to the plurality of nodes.
A computer program that is combined with a computer that is hardware and is stored in a computer-readable recording medium to perform the control method of the communication network system of claim 9 .