KR101601045B1 - Machine to machine communication method for machine to machine communication system - Google Patents

Abstract

A machine to machine (M2M) communication method of an M2M communication system according to the present invention can comprise the steps of: having an external device, which is out of a wireless communication range of a wireless network composed of a gateway and a plurality of internal devices, request the internal devices included in the wireless network for ID information; requesting to assign an ID by selecting a device of which the number of levels with a higher level is shortest, from the ID information, if the internal devices included in the wireless network which receives the ID information request return the ID information thereof; and having a device receiving the request to assign an ID communicate with the gateway through the external device which transmits the ID information based on the ID information, if the ID information assigned on the external device is received.

Description

TECHNICAL FIELD [0001] The present invention relates to an M2M communication method for an M2M communication system,

The present invention relates to an M2M communication method, and more particularly, to an M2M communication method of an M2M communication system that enables wireless communication with a device located outside a communication range of a wireless network in an M2M communication system supporting M2M communication .

In machine-to-machine communication system, machine to machine (M2M) communication is to implement the concept of Internet of Thing, and it is necessary to exchange information between terminal and base station, This means that communication is carried out only between machines without the other.

Services that can be implemented using M2M communication include secured access, surveillance services, tracking, tracing, recovery services, public safety services, automatic payments payment service, healthcare service, remote maintenance and control service, and smart metering service.

Such a M2M communication system may use various device identifiers, which are used by the base station to connect and disconnect the devices, and to control the status of the devices. In addition, a device identifier can be used when a base station transmits information on resources (A-MAP IE) allocated to each device. In this case, when transmitting the resource allocation information (A-MAP IE) message to the device, the identifier information of the device is directly included in the resource allocation information (A-MAP IE) Is masked in an exclusive OR (XOR) operation on a cyclic redundancy check (CRC) for the data.

On the other hand, M2M communication is a communication system to support metering, health care, fleet management, etc. It should meet requirements such as low power consumption, support for multiple devices, small burst transmission and security support. Therefore, there is a need to provide a device identifier so that a plurality of devices can operate with minimum power while minimizing changes in the physical layer of the conventional system.

Such a M2M communication is disclosed in Korean Intellectual Property Office (KIPO) as a method of transmitting in M2M communication, which is disclosed in Patent Publication No. 1020120090855. In this case, at least one terminal among a plurality of terminals has a terminal group identifier (M2M device group ID, and MGID), and maintaining the terminal group identifier when at least one terminal belonging to the group terminal is in an idle state.

As such, in the past, efforts have been made to efficiently provide identification information to devices.

In addition, it is also required to develop a technology for securing stable communication to devices outside the communication range and outside the communication range of the wireless network through a method for selecting a network path that can broaden the communication range of the limited wireless network in the past .

In particular, the development of a technology that can reduce costs and increase profits by eliminating the need to install additional access points (APs) in expanding the communication range of the wireless network, thereby solving the profit and cost problems of service providers Required.

It has also been required not only to extend the communication range of the wireless network but also to allow the devices outside the wireless communication range to select the shortest path to perform the M2M communication function.

Korean Patent Publication No. 1020120090855 Korean Patent Publication No. 1020120080542

An object of the present invention is to provide an M2M communication method of an M2M communication system that enables wireless communication to devices located outside a communication range of a wireless network in an M2M communication system supporting M2M communication.

According to another aspect of the present invention, there is provided an M2M communication method for an M2M communication system, the method comprising the steps of: receiving, by an external device existing outside a wireless communication range of a wireless network constituted by a gateway and a plurality of internal devices, Requesting ID information to belong to internal devices; When an internal device belonging to a wireless network that receives a request for the ID information returns its ID information, requesting an ID to select an apparatus having the shortest number of layers with a higher level among the ID information; And a step of communicating with the gateway through the external device that has transmitted the ID information based on the ID information received by the device requested by the ID requesting to the external device.

In addition, the ID information of the internal device preferably includes information on the number of layers with the upper level.

It is preferable that the ID information given by the internal device to the external device is generated by combining the ID information of the internal device with the ID information uniquely assigned to the external device.

In addition, the ID information of the internal device has a number of digits corresponding to the number of layers with the upper level, and the number of digits is preferably a numerical sequence sequentially assigned according to the connection order.

In addition, the ID uniquely assigned to the external device is preferably a number sequentially assigned in accordance with the ID giving order.

The present invention has the effect of ensuring stable communication to devices outside the communication range and outside the communication range of the wireless network through a method for network path selection that can improve the communication range of a limited wireless network more widely.

Further, the present invention does not require installation of an additional access point (AP) in expanding the communication range of the wireless network, thereby reducing costs and increasing profits, thereby solving the problem of profit and cost of the service provider .

In addition, the present invention not only extends the communication range of the wireless network, but also enables devices outside the wireless communication range to select the shortest path to perform the M2M communication function.

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a diagram showing a configuration of an M2M communication system according to a preferred embodiment of the present invention. Fig.
Fig. 2 is a detailed configuration diagram of the device of Fig. 1; Fig.
3 is a flow chart of a method of M2M communication according to a preferred embodiment of the present invention.
4 is a diagram illustrating a communication process of an M2M communication system according to a preferred embodiment of the present invention.

The present invention guarantees reliable communication to devices outside the communication range and out of communication range of the wireless network through a method for network path selection that can improve the communication range of the limited wireless network more widely.

Further, the present invention does not require the installation of an additional access point (AP) in expanding the communication range of the wireless network, thereby reducing costs and increasing profits, thereby solving the profit and cost problems of the service provider.

Further, the present invention not only extends the communication range of the wireless network, but also permits devices outside the wireless communication range to perform the M2M communication function by selecting the shortest path.

<Configuration of the M2M communication system>

The configuration of the M2M communication system according to the preferred embodiment of the present invention will be described in detail with reference to FIG.

The M2M communication system includes a wireless network 200 formed by internal devices that perform M2M communication and the wireless network 200 includes a gateway 200 for communication with an external server M2M SEVER M2M Gateway (GSCL) 202 and a plurality of internal devices 204-210. The plurality of internal devices 204 to 210 perform services through M2M communication. Such devices may be smart phones, computers, washing machines, TVs, street lamps, and the like. The external device 212 existing outside the communication range of the wireless network 200 may also perform the M2M communication through the wireless network 200 through one of the devices in the wireless network 200 according to the preferred embodiment of the present invention .

The gateway 202 communicates with an external server 100 to enable management or monitoring of internal or external devices 204 to 212 constituting the wireless network 200 and provision of a predetermined service . In more detail, the server 100 receives a request from one or more of the first to Nth manager terminals 1021 to 102N, and transmits a request to the plurality of internal devices 204 to 210 in the wireless network 200, And provides a control command to an external device 212 connected through a plurality of internal devices 204 to 210 or processes information provided from the devices 204 to 212 and provides the processed command to the corresponding administrator terminal.

The detailed configuration of each part of the above-mentioned M2M communication system will be described with reference to FIG.

The plurality of devices 204 to 210 belonging to the wireless network include a device application module for performing a unique function, a communication module for communication with another device, and a DLA and a DSCL (Device Service Capability Layer).

The gateway 202 belonging to the wireless network includes a communication module, MID, which is responsible for communication with GAE, GGC, GRAR, GCS, GREM, GSEC, and other devices.

The server 100 includes a communication module and an MID for communication with other devices such as NAE, NGC, NRAR, NCS, NREM, and NSEC.

The administrator terminal 1021 is provided with a network application for performing control and management of a plurality of internal and external devices 204 to 212.

The authentication server 104 includes a database for storing information on a plurality of devices 204 to 212 and a communication module for communicating with other devices.

The device 212 located outside the wireless network is composed of a device application module, a communication module, and a DLA.

<M2M communication method>

The M2M communication method according to the present invention applicable to the above-mentioned M2M communication system will be described in detail with reference to the flowchart of FIG.

The external device 212 located outside the communication range of the wireless network 200 transmits an ID request message to the internal devices 204 to 210 of the wireless network 200 to join the wireless network 200 (Step 300).

Each of the internal devices receiving the ID request message among the internal devices 204 to 210 returns their ID information to the external device 212 in response to the request (3021 to 302N). Here, the ID information of the internal device can be determined by the number of devices that are required to communicate with the gateway 202 and the number sequence sequentially assigned according to the order of connection.

The external device 212 detects the device having the shortest path to reach the gateway 202 based on the ID information returned by the internal devices, and requests the device to give an ID (steps 304 and 306). More specifically, the IDs assigned to the devices in the wireless network are given X (X = 1, 2, 3, 4 ...) when they are directly connected to the gateway 202, (X = 1, 2, 3, 4, ..., Y = 1, 2, 3, 4 ...). Based on this ID granting method, the device with the shortest path is first selected. That is, the priority is X> XY.

Upon receiving the ID grant request, the internal device allocates the ID information of the external device 212 and returns it to the external device. Here, the ID information of the external device 212 is composed of its own ID and an ID uniquely assigned to the external device, and the ID uniquely assigned to the external device is a number Heat. The internal device provides the ID information of the external device to the gateway 202 and the server 100 so that the administrator and the server 100 acquire the ID information about the external device 212, 314).

Thereafter, the external device 212 stores the returned ID information, accesses the gateway 202 through the internal device 210 to which the ID is assigned through the stored ID information, (100). The server 100 also communicates with the external device 212 through the gateway 202 and the internal device 210.

As described above, the present invention enables an external device outside the communication range of the wireless network to receive the M2M communication service through DSCL (Device Service Capability Layer) of the internal device within the communication range of the wireless network. To this end, an external device outside the communication range of the wireless network registers its own Device Application (DA) in an internal device within the communication range of the wireless network, and the internal device updates its DSCL (Device Service Capability Layer).

After this registration, the DSCL update state of the internal device is updated also in the Gateway Service Capability layer (GSCL), which is the upper layer gateway, and also in the NSCL (Network Service Capability layer), which is a connected server.

Finally, when the update is completed in the NSCL of the server, the network application, that is, the user or the manager, can use the M2M communication service such as control, management, subscription, etc. to the external device outside the communication range of the registered wireless network .

4 schematically illustrates a method of M2M communication according to a preferred embodiment of the present invention. Referring to this, each device for the M2M communication service connected to the gateway GSCL has a unique name.

For example, the unique names (IDs) of devices connected to the gateway GSCL are determined by the value of the connected sequence. That is, the first device connected to the gateway GSCL is the "1" node, and the second connected device is the "2" node. Next, a unique name (ID) is assigned in the order of "3", "4", and "5".

The names (IDs) of the devices connected through the device are given by appending their names to the device names to which they are connected. That is, the first node connected to the node "1" is the node "11", and the node connected next is the node "12". Thus, according to the present invention, the unique name of the devices indicates the number of hierarchies of its own higher level.

Accordingly, the present invention can set a path for connection to the gateway GSCL without a separate routing table.

For example, if the nothing node is connected to the node "12", then the nothing node must go through two devices to receive the services of the corresponding system, and if connected to the node "5" It must go through two devices.

The present invention reduces the number of paths to receive a service when the conditions are the same, thereby reducing the time required for the entire service.

100: Server
200: Wireless network
202: gateway
204 to 210: Internal device
212: External device

Claims (9)

An M2M communication method for an M2M communication system in which a plurality of internal devices, a gateway, a server, and an administrator terminal are connected by a wireless network,
An external device existing outside the wireless communication range of the wireless network requests ID information from internal devices belonging to the wireless network;
When an internal device belonging to a wireless network receiving a request for the ID information returns its ID information, requesting an ID of an internal device having the lowest number of layers with a higher level among the ID information;
Wherein the external device registers the external device ID information to the internal device when the ID of the internal device requested by the ID request is received by the external device and the DSC of the internal device is updated ;
Updating the DSCL update state to the gateway GSCL and also to the connected NSCL server; And
And when the update is completed in the NSCL of the server, using the M2M communication service for the external device by the administrator terminal,
The ID information of the internal device includes information on the number of layers with the high level, the ID information of the internal device has a number of digits corresponding to the number of layers with the high level, And the number sequence is sequentially assigned to the M2M communication system. The method according to claim 1,
Wherein the ID information given by the internal device to the external device is generated by combining the ID information of the internal device with the ID information uniquely assigned to the external device. The method according to claim 1,
Wherein the ID uniquely assigned to the external device is a number sequentially assigned in accordance with an ID giving order. delete delete delete delete delete delete

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