KR101945180B1 - Wireless iot module coordinate system - Google Patents

Abstract

The present invention suggests a wireless IoT module coordination system. A wireless IoT module coordination system according to the present invention is a system for managing a wireless IoT module, comprising: a server for storing data; an Internet for collecting the data and enabling communication; and a wireless IoT module for transmitting / receiving pre- And a coordinator for transmitting predetermined device information and data to the server, the Internet, or a wireless IoT module and controlling the wireless IoT module. According to the present invention, the flexible and reliable wireless IoT module management using the IEEE802.15.4e TSCH It is possible.

Description

{WIRELESS IOT MODULE COORDINATE SYSTEM}

The present invention relates to a wireless IoT module coordination system, and more particularly, to a technology for controlling a wireless IoT module using an IEEE 802.15.4e TSCH.

With the development of Information & Communication Technology (ICT), the majority of devices in the vicinity are changing into a structure that is interlinked and interconnected through a communication network. Through the rapid development of ICT, A hyperconnected society in which objects and people are connected to each other through a network that communicates with each other through a network, and adds a connection dimension of "anything" to any world of "anytime" and "anywhere" (Internet of Things), a new linking ecosystem to the Internet.

Internet (IoT) is an evolutionary stage of Internet than wired communication based internet and mobile internet. In the early wired communication period, human intervention was required as an intermediary by exchanging data only through connection between objects such as PC. However, With the progress of wireless communication technology gradually, the range of communication with people, people, objects, things and things has been expanded, and furthermore, it has developed into M2M, which can communicate autonomously between objects.

Through the M2M, intelligent relationships that can be sensed, controlled, exchanged, and processed between the major components have been formed, and this has been transformed into a service type. Furthermore, the concept of M2M through the Internet (IoT) By applying to the structure, the next generation Internet environment is evolving into a concept that interacts with all the information of reality and virtual world.

As the Internet (IoT) evolves, various devices are being changed to IoT devices. IoT devices are connected to each other by various network methods to construct an internet network. These IoT devices are provided with communication means for connection of various networks, and in order to connect these networks, it is necessary to set network connection information for the communication means of the IoT device and various modules are required.

Particularly, research on the efficiency of wireless MAC (Medium Access Control Protocol) is important when building industrial wireless IoT module, process control using this, and disaster safety management system. Although the standard of TSCH wireless MAC is proposed through IEEE802.15.4, the cooperative scheduling method between the coordinator and the devices is not covered in the standard, and each of them is implemented by a unique method. Also, in order to use existing wireless IoT modules, the same method as IEEE802.15.4 or Zigbee was used, but there were problems due to the limitation of the number of receiving nodes and channel interference.

Korean Patent Laid-Open Publication No. 10-2012-0136579 (an operation management device for upgrading a program installed in the IoT communication module and a driving method thereof)

SUMMARY OF THE INVENTION It is an object of the present invention to provide a wireless IoT module coordination system capable of enhancing the management efficiency of a wireless MAC when a wireless IoT module, a process control using the wireless IoT module, and a disaster safety management system are constructed.

A wireless IoT module coordination system according to one aspect of the present invention is a system for managing a wireless IoT module, comprising: a server for storing data; an Internet for collecting the data and enabling communication; And a coordinator for transmitting the IoT module and the pre-designated device information and data to the server, the Internet, or a wireless IoT module and controlling the wireless IoT module, wherein the coordinator communicates with the wireless IoT module You can control the way you do and the order.

Preferably, the coordinator can use the IEEE 802.15.4e TSCH when controlling the wireless IoT module.

Preferably, the coordinator transmits the pre-designated device information and data to the server, the Internet, or the wireless IoT module, and controls the wireless IoT module, but may be interlocked with the smart terminal.

Preferably, the coordinator further comprises: a scanning unit for scanning EBs (Enhanced Beacons) of a device joining the network; A switching unit for receiving the EB from the advertisement node and initializing a slot frame and link using the information included in the EB, and switching the device to the TSCH mode; And an allocator allocating a slot frame and a link in the device, hopping the channel offset at the converted operating frequency f every slot frame cycle, and allocating a channel according to the channel mapping.

Preferably, when the device joins the network, the coordinator randomly selects one of windows 0 to be occupied within one hop or two hops except for the window used when the values of the aggregate elements of EBs are all ORed .

According to the present invention, the flexible and reliable wireless IoT module control using the IEEE802.15.4e TSCH When a device joins the network, one of the windows indicated by 0 except for the window occupied within one hop or two hops is randomly selected and allocated when the values of the aggregate elements of EBs are all ORed And it is possible to set a link without collision by allocating a unique link in the TSCH since it schedules its own schedule while avoiding the schedule observed in the vicinity of 2 hops.

1 is a configuration diagram of a wireless IoT module coordination system according to an embodiment of the present invention.
FIG. 2 is a view illustrating a slot frame cycle structure of a wireless IoT module coordination system according to an embodiment of the present invention.
3 is a diagram illustrating an example of a time slot of a wireless IoT module coordination system according to an exemplary embodiment of the present invention.
4 is a diagram illustrating an example of a channel sequence of a wireless IoT module coordination system according to an embodiment of the present invention.
5 is an exemplary diagram illustrating a selection algorithm of a wireless IoT module coordination system according to an embodiment of the present invention.
6 is a diagram illustrating a wireless IoT module coordination system operable with a smart terminal according to an embodiment of the present invention

In order to fully understand the present invention, operational advantages of the present invention, and objects achieved by the practice of the present invention, reference should be made to the accompanying drawings and the accompanying drawings which illustrate preferred embodiments of the present invention. It is also to be understood that the specific structure or functional description presented in the embodiments of the present invention is illustrated for the purpose of describing an embodiment according to the concept of the present invention only and embodiments according to the concept of the present invention may be embodied in various forms . Likewise, it should be understood that the present invention should not be construed as limited to the embodiments described herein, but includes all modifications, equivalents, and alternatives falling within the spirit and scope of the present invention.

In the wireless IoT module coordination system according to an embodiment of the present invention, when a process control / disaster management system using industrial wireless IOT modules is constructed, the coordinator secures communication channels with a plurality of distributed devices (industrial IoT modules) To the server terminal inherited from the Internet backbone, or to provide the control information transmitted from the server terminal to each device.

Therefore, the coordinator must employ a time slotted channel hopping method to establish an effective communication channel with distributed devices, and have a method for scheduling time slot assignment and hopping sequence.

In order to effectively provide such a scheduling method, a traffic monitoring and context aware algorithm must be provided in a centrally or distributed manner, and a function of connecting / holding / releasing a communication channel with devices should be provided.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. Like reference symbols in the drawings denote like elements.

FIG. 1 is a configuration diagram of a wireless IoT module coordination system 1 according to an embodiment of the present invention. Referring to FIG.

The wireless IoT module coordination system 1 according to an embodiment of the present invention includes a server 10, an Internet 20, a coordinator 40, and a wireless IoT module 30.

The server 10 stores information and data desired by the user, and can be implemented in a general database (DB) format.

The Internet 20 is a well-known technology as a computer network communication network, and can perform information search and collection, and enables communication.

The wireless IoT module 30 is managed by the coordinator 40 and is an entity having respective information and can be implemented in the form of various devices used in a general industrial field.

The coordinator 40 manages the wireless IoT module 30 and determines the order and procedures for communicating with the wireless IoT modules 30 when controlling the plurality of wireless IoT modules 30, And the transmission of the data to be controlled and the data to be controlled. At this time, the coordinator 40 can use IEEE802.15.4e TSCH, which is an industrial sensor wireless communication standard. The coordinator 40 may be implemented in the form of a central processing unit (CPU, AP) such as a PC or a mobile phone.

The coordinator 40 uses the IEEE802.15.42 TSCH to construct a wireless IoT module 30 implemented in the form of a plurality of distributed devices when the process control and disaster management system using the wireless IoT module 30 are constructed. A communication channel to communicate with the Internet 20, the server 10, and the like, and transmits information from the wireless IoT module to the Internet 20, the server 10, and the like. In this case, the coordinator 40 may use a time slotted channel hopping method to efficiently establish a communication channel with a plurality of distributed wireless IoT modules 30. In this case, the coordinator 40 may schedule a time slot allocation and a hopping sequence You must first come up with a method for To provide such a scheduling method, a traffic monitoring and context aware algorithm may be provided in a centralized or distributed manner, and a function of connecting / maintaining / releasing a communication channel by a proper procedure with a plurality of wireless IoT modules or devices may be provided .

Hereinafter, a TSCH scheduling method in a system for managing a wireless IoT module according to an embodiment of the present invention will be described.

FIG. 2 is an exemplary view illustrating a slot frame cycle structure of a wireless IoT module coordination system according to an embodiment of the present invention. FIG. 3 is an exemplary view illustrating time slots of a wireless IoT module coordination system according to an embodiment of the present invention. to be.

During a time slot, one node sends one frame and the other node responds with Ack if the frame is well received. If Ack does not come within a given time, it waits for retransmission until the next allocated transmission time slot.

Advertiser nodes periodically broadcast EBs (Enhanced Beacons).

EBs includes synchronization information, channel hopping information, timeslot information, and initial link and slotframe information.

The synchronization information enables the new device to synchronize with the network. Channel hopping information allows the new device to know the channel hopping order. Timeslot information indicates the time at which frame transmission and acknowledgment can be transmitted. The initial link and slotframe information allows the new device to know when to send a message from the ad node and when to send it to the ad node.

The procedure for joining to the network is as follows.

The device joining the network scans the EBs. Upon receipt of an EB from the advertisement node, the upper layer informs the upper layer, and the upper layer initializes the slotframe and the link using the information included in the received EB, and switches the device to the TSCH mode.

The device then allocates communication resources (slotframes and links). And you can start advertising on your own turn.

As long as direct communication between devices is possible, a link is given as a pair of t (slot in the frame) and chOf (channel offset).

a link [t, chOf]

, 여기서 S는 the slotframe size, k는 the slotframe cycle을 뜻한다.The ASN represents the total number of slots that have gone through since the network was installed,

, Where S is the slotframe size and k is the slotframe cycle.

The channel offset is converted to the operating frequency f as follows.

Where n _ch denotes the total number of channels, F denotes the Channel Hopping Seq. It is a look-up function through Table.

S and n _ch are prime to each other.

Each link cycles through the k-capable channels while continuing the k-cycle.

For example, a channel sequence of link [t = 3, chOf = 1] in a network with n _ch = 16 and S = 7 is as shown in FIG.

4 is a diagram illustrating an example of a channel sequence of a wireless IoT module coordination system according to an embodiment of the present invention.

link (t = 3, chOf = 1) is hopped at f frequency every slotframe cycle as shown in Table 1, and a channel is allocated according to channel mapping.

Therefore, a non conflict link can be assigned a unique pair of t and chOf.

(집합요소가 타임슬롯 오프셋 k와 채널오프셋 j의 쌍, 여기서

,

)집합으로 다음과 같이 표현할 수 있다.In a network with a number of time slots S and a channel number n _ch in a slot frame,

(The set element is a pair of timeslot offset k and channel offset j, where

,

) Set can be expressed as follows.

..., {0, n _ch -1}, ..., {0, 0}, ..., {0, j}, ...,

{1, 0}, {1, 1}, ..., {1, j}, ..., {1, n _ch -1}

                                        :

..., {k, n _ch -1}, {k, 0}, {

:

{S-1, 0}, {S-1, 1}, ..., {S-1, j}, ..., {S-1, n ch -1}}

The advertisement node assigns one bit to each element of the set Φ and expresses it as 1 if the link is occupied or 0 otherwise. The advertisement node advertises the bit stream (containing the set Φ bit representation) including the occupation of the link in the enhanced beacon (EB).

The allocation method of the unique value link {k, j} will be described as follows.

5 is an exemplary diagram illustrating a selection algorithm of a wireless IoT module coordination system according to an embodiment of the present invention.

As shown in FIG. 5, the number of each node is a pair value (= link) occupied by the current node. Assign a bit value to each element of the set represented by the pair value and change the entire set to a binary representation.

Red 1 is the link value occupied by itself, and black 1 is the link occupied by neighboring nodes that have fallen to one hop.

When a new device is attempting to join, all the values of the aggregate elements of EBs are ORed, and the link indicated by 1 means the window occupied within one hop or two hops. Therefore, one of the windows displayed with 0s other than this window may be selected randomly.

As a result, elements 7 and 8 remain free, and if one of them is selected, the new node acquires the link (k, j) corresponding to element 7 of its schedule,

식과 채널매핑테이블을 통해 채널 호핑 시퀀스를 따라 부모노드에 조인하고 통신을 할 수 있다.

The formula and channel mapping table can be used to join and communicate with the parent node along the channel hopping sequence.

It is possible to set a link without collision by allocating a unique link in the TSCH since it schedules its own schedule while avoiding the schedule observed in the vicinity of 2 hops.

FIG. 6 is a diagram illustrating a wireless IoT module coordination system 2 capable of interworking with a smart terminal according to an embodiment of the present invention. Referring to FIG. 6, the server 10, the Internet 20, the wireless IoT module 30, And the coordinator 40 are as described above, and the smart terminal 50 may be implemented in the form of a smart phone, a tablet PC, or the like. The smart terminal 50 can perform management and control of the wireless IoT module 30 performed by the coordinator 40 in cooperation with the coordinator 40. The smart terminal 50 can also be operated as a mobile app. The server 10 and the Internet 20 can also be communicated and controlled by using the smart terminal 50 and the server 10 and the Internet 20 may be provided in the smart terminal 50.

The present invention has been described in detail with reference to preferred embodiments. It will be apparent to those skilled in the art that the present invention is not limited to the embodiments described above and that various modifications and changes may be made by one of ordinary skill in the art without departing from the scope of the present invention, It is to be understood that the technical idea of the present invention extends to the extent possible.

1,2: Wireless IoT Module Coordinate System
10: Server
20: Internet
30: Wireless IoT module
40: Coordinator
50: Smart terminal
410: Scanning section
420:
430:

Claims (5)

A system for managing a wireless IoT module,
A server for storing data;
An internet for collecting the data and enabling communication;
A wireless IoT module for transmitting and receiving previously designated device information; And
And a coordinator for transmitting the pre-designated device information and data to the server, the Internet, or a wireless IoT module and controlling the wireless IoT module,
Wherein the coordinator comprises:
Controlling the manner and order of communication with the wireless IoT module when the wireless IoT module is controlled,
When a device joins a network, one of the windows displayed occupied within one hop or two hops except for the window to be used, which is displayed as 0, is randomly selected and allocated when the values of the aggregate elements of EBs are all ORed Wireless IoT module coordination system.
The method according to claim 1,
Wherein the coordinator uses the IEEE 802.15.4e TSCH when controlling the wireless IoT module.
The method according to claim 1,
Wherein the coordinator transmits the pre-designated device information and data to the server, the Internet, or the wireless IoT module, and controls the wireless IoT module, and interworks with the smart terminal.
The method of claim 1, wherein
Wherein the coordinator comprises:
A scanning unit for scanning EBs (Enhanced Beacons) of a device joining the network;
A switching unit for receiving the EB from the advertisement node and initializing a slot frame and link using the information included in the EB, and switching the device to the TSCH mode; And
And an allocation unit allocating a slot frame and a link in the device, hopping the channel offset at the converted operating frequency f every slot frame cycle, and allocating a channel according to the channel mapping. .
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