KR102310628B1 - Underground supervisory communication apparatus providing emergency communication function and method - Google Patents

Abstract

The present invention relates to an underground monitoring communication device providing an emergency communication function and a method thereof. The present invention provides emergency communication functions that: establish a voice communication channel between a ground terminal and an underground terminal by creating a channel protocol which defines a packet transmission rate between monitoring data and voice call data according to the transmission amount per unit time of the monitoring data for at least one power facility located underground; provide a monitoring function of the underground power facility by alternately transmitting, to the ground terminal, an emergency communication packet and a monitoring data packet including the monitoring data, the emergency communication packet including data received through the voice communication channel according to the channel protocol; and at the same time enable a call between a user of the underground terminal located in a communication shaded area and a user of the ground terminal.

Description

Underground supervisory communication apparatus providing emergency communication function and method

It relates to an underground monitoring communication device for monitoring an underground power facility and providing an emergency communication function between a ground terminal and an underground terminal, and an underground monitoring communication method thereof.

Recently, power facilities such as power cables used for transmission and distribution of city power are increasingly being buried underground for city aesthetics, safety, electromagnetic wave shielding, and the like. Underground burial of power cables is made by drilling a very long tunnel underground and laying out power cables there. In general, the inspection of power facilities located underground is operated based on periodic weekly patrol monitoring by humans.

The underground common area where underground power facilities are mainly installed is a communication shaded area where ground communication radio waves do not reach because it is formed deep underground. Accordingly, it was impossible to contact other users on the ground even if an emergency such as fire, explosion, or toxic gas occurred to a user working in the underground common pit, or if you wanted to make any inquiries to a person with abundant knowledge about power facilities. . For this reason, in most cases, the inspection of underground power facilities was insufficient, and when an emergency situation occurred underground, it frequently led to a major accident.

An object of the present invention is to provide an underground monitoring communication device and method that provides an emergency communication function that enables a call between a user of an underground terminal located in a communication shaded area and a user of a ground terminal while providing the monitoring function of the underground power facility. It is not limited to the technical problem as described above, and another technical problem may be derived from the following description.

An underground monitoring communication method according to an aspect of the present invention includes the steps of identifying at least one ground terminal located on the ground from among a plurality of user terminals; acquiring a current communication state of each of the identified at least one terrestrial terminal; transmitting a group information packet including information on a current communication state of each of the obtained at least one terrestrial terminal to an underground terminal located underground among the plurality of user terminals; The ground terminal selected by the user of the underground terminal and the underground terminal by creating a channel protocol that defines a packet transmission rate between the monitoring data and the voice call data according to the transmission amount per unit time of the monitoring data for at least one power facility located underground establishing a voice communication channel between terminals; and alternately transmitting an emergency communication packet including data received through the established voice communication channel and a monitoring data packet including the monitoring data to the selected terrestrial terminal according to the channel protocol generated in the voice communication channel establishment step. includes steps.

The step of alternately transmitting according to the channel protocol generated in the step of establishing the voice communication channel is a unit packet of an emergency communication packet having a length corresponding to the unit length of the emergency communication packet defined in the packet transmission rate and the packet transmission rate defined in the packet transmission rate. It is possible to alternately transmit unit packets of monitoring data packets having a length corresponding to the monitoring data packet unit length.

The step of alternately transmitting according to the channel protocol generated in the step of establishing the voice communication channel is defined in the packet transmission rate and the number of unit packet bundles of emergency communication packets as many as the number corresponding to the number of emergency communication packet units defined in the packet transmission rate. Unit packet bundles of monitoring data packets as many as the number corresponding to the number of monitoring data packets can be transmitted alternately.

In the step of establishing the voice communication channel, the transmission amount per unit time of the monitoring data is estimated according to the type of at least one field device providing the monitoring data, and the monitoring data and the transmission amount per unit time of the estimated monitoring data are performed. A packet transmission rate between the voice call data may be defined.

The underground monitoring communication method receives a channel establishment request packet including the ID of the terrestrial terminal selected by the user and the type of the emergency communication channel selected by the user from among a plurality of types of emergency communication channels from the underground terminal receiving the group information packet. The step of further comprising the step of establishing the voice communication channel may include establishing the voice communication channel when the type of the selected emergency communication channel corresponds to a voice communication channel.

In the underground monitoring communication method, if the type of the emergency communication channel selected by the user is a video call channel, the selected establishing a video call channel between the terrestrial terminal and the underground terminal; and alternately transmitting an emergency communication packet including data received through the established video call channel and a monitoring data packet including the monitoring data to the selected terrestrial terminal according to the channel protocol generated in the video call channel establishment step. It may include further steps.

The underground monitoring communication method includes: determining a sampling rate of video call data according to a transmission amount per unit time of monitoring data being received by the terrestrial terminal selected by the user; and sampling the data received through the established video call channel according to the determined sampling rate, wherein the step of alternately transmitting the sampled data according to the channel protocol generated in the video call channel establishment step is It is possible to generate an emergency communication packet including the monitoring data packet.

In the underground monitoring communication method, when the type of the emergency communication channel selected by the user corresponds to the broadcast channel, the emergency communication packet including the data transmitted through the broadcast channel is transmitted with respect to the monitoring data packet including the monitoring data. establishing a broadcasting channel between all of the at least one terrestrial terminal located on the ground and the underground terminal by generating a channel protocol defining a packet transmission order; and at least one emergency communication packet including data received through the established broadcasting channel in preference to the monitoring data packet including the monitoring data according to the channel protocol generated in the broadcasting channel establishment step, located on the ground. It may further include the step of transmitting to the entire terrestrial terminal.

In the underground monitoring communication method, when the type of the emergency communication channel selected by the user corresponds to the bulletin board channel, the emergency communication packet including data transmitted through the bulletin board channel is transmitted with respect to the monitoring data packet including the monitoring data. establishing a broadcasting channel between at least one terrestrial terminal and the underground terminal by the user by generating a channel protocol defining a packet transmission order; and an emergency communication packet including data received through the established bulletin board channel in preference to the monitoring data packet including the monitoring data according to the channel protocol created in the step of establishing the bulletin board channel to the selected at least one terrestrial terminal It may further include the step of transmitting.

An underground monitoring communication device according to another aspect of the present invention includes: a terminal management unit for identifying at least one terrestrial terminal located on the ground among a plurality of user terminals, and acquiring a current communication state of each of the identified terrestrial terminals; a lower level communication unit for transmitting a group information packet including information on the current communication state of each of the at least one terrestrial terminal obtained from the plurality of user terminals to an underground terminal located underground; The ground terminal selected by the user of the underground terminal and the underground terminal by creating a channel protocol that defines a packet transmission rate between the monitoring data and the voice call data according to the transmission amount per unit time of the monitoring data for at least one power facility located underground a channel management unit for establishing a voice communication channel between terminals; and alternately transmitting an emergency communication packet including data received through the established voice communication channel and a monitoring data packet including the monitoring data to the selected terrestrial terminal according to the channel protocol generated in the voice communication channel establishment step. Includes upper level communication unit.

Establish a voice communication channel between a ground terminal and an underground terminal by creating a channel protocol that defines the packet transmission rate between the monitoring data and the voice call data according to the transmission amount per unit time of the monitoring data for at least one power facility located underground; According to the protocol, the emergency communication packet including the data received through the voice communication channel and the monitoring data packet including the monitoring data are alternately transmitted to the ground terminal to provide the monitoring function of the underground power facility and at the same time to the underground terminal located in the communication shadow area. It provides an emergency communication function that enables a call between a user of a terrestrial terminal and a user of a land terminal.

The underground common area where underground power facilities are mainly installed is a communication shaded area where ground communication radio waves do not reach because it is formed deep underground. Accordingly, it was impossible to contact other users on the ground even if an emergency such as fire, explosion, or toxic gas occurred to a user working in the underground common pit, or if you wanted to make any inquiries to a person with abundant knowledge about power facilities. . In order to solve this problem, the present invention provides an emergency communication function that enables a call between a user of an underground terminal and a user of a terrestrial terminal.

In particular, a voice communication channel is established by creating a channel protocol that defines the packet transmission rate between monitoring data and voice call data, and emergency communication packets including data received through the voice communication channel according to the channel protocol and monitoring data are included. By alternately transmitting the monitoring data packets to the terrestrial terminal, real-time transmission of both surveillance data and voice call data can be guaranteed. can proceed.

1 is an exemplary diagram of an application environment of an underground monitoring communication device 1 according to an embodiment of the present invention.
FIG. 2 is a block diagram of the underground monitoring communication device 1 shown in FIG. 1 .
3 to 5 are flowcharts of an underground monitoring communication method according to an embodiment of the present invention.
FIG. 6 is an exemplary view of an application screen of the underground terminal 4 shown in FIG. 2 .

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. Embodiments of the present invention relate to an underground monitoring communication device and method for providing an emergency communication function that enables a call between a user of an underground terminal located in a communication shaded area and a user of a ground terminal while providing a monitoring function of an underground power facility will be. Hereinafter, these devices and methods may be briefly referred to as "underground monitoring communication device" and "underground monitoring communication method". In addition, it may be called "underground" inclusive of underground tunnels and underground tunnels, and "managers" of underground power facilities may be called "users" in terms of using the underground monitoring and communication device.

1 is an exemplary diagram of an application environment of an underground monitoring communication device 1 according to an embodiment of the present invention. The underground communication device 1 according to the present embodiment is applicable to the remote monitoring and control system shown in FIG. 1 . The remote monitoring and control system of this embodiment monitors and controls at least one power facility installed in an underground common area, a plurality of underground monitoring and communication devices (1), a plurality of network switches (2), an upper server (3), and Consists of a plurality of user terminals (4). These are components of the remote monitoring control system to help the understanding of this embodiment may further include other elements. For example, a modem, a router, etc. for Internet Protocol (IP) communication may be added.

An underground tunnel is a very long tunnel formed underground to jointly accommodate power cables, communication cables, gas pipes, and water pipes. In this embodiment, the underground tunnel means an underground tunnel in which power facilities such as power cables and field devices for monitoring them are installed. The user of each user terminal 4 normally operates the remote monitoring and control system on the ground or checks the ground power facilities, and enters the underground common area to periodically check the power facilities installed in the underground common area. Referring to FIG. 1 , a manhole cover is installed at the entrance of the underground tunnel, and the stairs for the user to ascend and descend are briefly indicated by dotted lines.

Hereinafter, at least one power facility installed in the underground common pit may be simply referred to as an "underground power facility". Also, among the plurality of user terminals, the user terminal 4 located on the ground may be referred to as a "terrestrial terminal", and the user terminal 4 located in the basement may be referred to as an "underground terminal".

The underground monitoring and communication device (1) is installed in the underground common area, and the upper server (3) located in a remote location on the ground and at least one user terminal (4) are installed in the underground common area, for example, the monitoring data for the power cable. By transmitting, it provides a monitoring function of underground power facilities. Because the underground tunnel is formed deep underground, it is a communication shaded area where radio waves for terrestrial communication do not reach. Accordingly, it was impossible to contact other users on the ground even if an emergency such as fire, explosion, or toxic gas occurred to a user working in the underground common pit, or if you wanted to make any inquiries to a person with abundant knowledge about power facilities. . In order to solve this problem, the underground monitoring communication device 1 of the present embodiment provides an emergency communication function that enables a call between the user of the underground terminal 4 and the user of the ground terminal 4 .

The plurality of network switches 2 transmit packets between the underground monitoring communication devices 1 through the local network, and transmit packets from the underground monitoring communication device 1 to the upper server 3 through the wide area network. . Each network switch 2 may be implemented as an optical switch so that a real-time call between the user of the underground terminal 4 and the user of the terrestrial terminal 4 can be smoothly made. The upper server 3 is a kind of HMI (Human Machine Interface) server, and it analyzes the monitoring data received from the plurality of underground monitoring communication devices 1 and outputs the result in the form of an image or text that the user can understand. . Each user terminal 4 is a mobile terminal that the user can carry, and a representative example is a smart phone. The network switch 2, the upper server 3, and the user terminal 4 are general components in the field of remote monitoring and control, and further detailed description will be omitted.

FIG. 2 is a block diagram of the underground monitoring communication device 1 shown in FIG. 1 . Referring to FIG. 2 , the underground monitoring communication device 1 according to the present embodiment includes a terminal management unit 11 , a channel management unit 12 , a sampling unit 13 , a data collection unit 14 , a storage 15 , and a diagnosis. It is composed of a unit 16 , a user interface 17 , an upper communication unit 18 , a lower communication unit 19 , a switching unit 110 , and a packet processing unit 111 . The underground monitoring communication device 1 according to the present embodiment further includes a power supply for supplying driving power of the underground monitoring communication device 1, a housing surrounding the electronic components corresponding to the above-described configuration, and the like. A general configuration that is not related will be omitted.

The terminal management unit 11 serves to manage a plurality of user terminals (4). For example, the terminal management unit 11 recognizes the connection of the underground terminal 4, identifies at least one ground terminal 4 located on the ground among the plurality of user terminals 4, and at least the identified at least A current communication state of each of the terrestrial terminals 4 is acquired.

The channel management unit 12 establishes or releases a channel for emergency communication between at least two or more user terminals 4 among a plurality of user terminals 4 and serves to generate a packet to be transmitted through the emergency communication channel. In this embodiment, transmitting a packet through a certain emergency communication channel means transmitting a packet including the type of the emergency communication channel, and receiving a packet through a certain emergency communication channel indicates the type of the emergency communication channel. means to receive a packet containing Accordingly, when the user terminal 4 receives a packet through a certain emergency communication channel, it can process the corresponding packet according to the type of the emergency communication channel.

The sampling unit 13 determines the sampling rate of the video call data to be transmitted from the underground terminal 4 to the ground terminal 4 according to the transmission amount per unit time of the monitoring data being received by the ground terminal 4, and the determined sampling The video call data received from the underground terminal 4 is sampled according to the rate. The sampling unit 13 will be described in detail below.

The data collection unit 14 collects monitoring data for at least one power facility installed underground. Examples of field devices that provide such monitoring data include thermal imaging cameras, partial discharge sensors, and watt-hour meters. Thermal imaging cameras are installed around underground power facilities to take pictures of underground power facilities. The partial discharge sensor is installed inside the underground power facility to detect the partial discharge generated from the underground power facility. The watt-hour meter is installed at the power output stage of the underground power facility and measures the amount of power output from the underground power facility. The data collection unit 14 collects monitoring data such as thermal image data, partial discharge data, and electric energy data from these field devices.

The storage 15 stores the operating program of the underground monitoring communication device 1, the monitoring data collected by the data collection unit 14, the emergency communication group data, the wattage table, and the like. The plurality of underground monitoring communication devices 1 share emergency communication group data with each other, and the emergency communication group data is stored in the storage 15 of each underground monitoring communication device 1 . The storage 15 stores a transfer amount table in which an average transfer amount per unit time is recorded for each type of field device. The emergency communication group data and transmission amount table will be described in detail below.

The diagnosis unit 16 diagnoses the operating state of the underground power facility based on the monitoring data stored in the storage 15 . For example, the diagnosis unit 16 may diagnose the state of the underground power facility based on the thermal image data, the partial discharge data, and the electric power amount data. Since the diagnosis unit 16 is not related to the characteristics of the present embodiment, a detailed description of the diagnosis method of the diagnosis unit 16 will be omitted.

The user interface 17 receives various commands such as power-on, power-off, and operation control of the underground monitoring communication device 1 from the user, and displays the state information of the underground power facility and the diagnosis result of the diagnosis unit 16 to the user. do. The user interface 17 may be implemented with various input/output devices such as a liquid crystal display (LCD), a light emitting diode (LED), a touch screen, a warning light, a speaker, a keyboard, a mouse, a button, and a switch. For example, the user interface 17 may display status information of an underground power facility using an LCD. If the diagnosis result of the diagnosis unit 16 indicates that a fire has occurred inside the underground power facility, the user interface 17 may provide a fire alarm using a warning light and a speaker.

The upper level communication unit 18 communicates with the other underground monitoring communication device 1 via the network switch 2 and communicates with the upper level server 3 . The lower communication unit 19 communicates with the underground terminal 4 connected by wire through a USB (Universal Serial Bus) port or wirelessly connected using Wi-Fi communication.

The switching unit 110 controls the terminal management unit 11 or the channel management unit 12 when the destination of each packet generated by the terminal management unit 11 or the channel management unit 12 is the upper server 3 or the terrestrial terminal 4 . It is connected to the upper communication unit 18 among the upper communication unit 18 and the lower communication unit 19 . The upper communication unit 18 transmits the packet input from the terminal management unit 11 or the channel management unit 12 to the upper server 3 or the terrestrial terminal 4 through the switching unit 110 . The switching unit 110 connects the terminal management unit 11 or the channel management unit 12 with the upper communication unit 18 when the destination of each packet generated by the terminal management unit 11 or the channel management unit 12 is the underground terminal 4 . It is connected to the lower communication unit 19 of the lower communication unit (19). The lower communication unit 19 transmits the packet input from the terminal management unit 11 or the channel management unit 12 to the underground terminal 4 through the switching unit 110 .

The packet processing unit 111 monitors the packet received by the lower communication unit 19 and the packet received by the upper communication unit 18, and analyzes the header and payload of each packet to determine the type of each packet, source address, destination address, etc. , and extracts data to be transmitted through each packet from each packet. According to the Open System Interconnection (OSI) standard, each packet consists of a header and a payload. Hereinafter, a packet conforming to the OSI standard will be referred to as a unit packet. In general, data to be transmitted by the user terminal 4 or the underground monitoring communication device 1 is transmitted in a plurality of unit packets.

3 to 5 are flowcharts of an underground monitoring communication method according to an embodiment of the present invention. Referring to FIGS. 3-5 , the underground monitoring communication method according to the present embodiment includes steps performed by the underground monitoring communication device 1 shown in FIG. 2 . Therefore, the description of the underground monitoring communication device 1 as described above also applies to the underground monitoring communication method. Hereinafter, the underground monitoring communication device 1 and the underground monitoring communication method according to the present embodiment will be described in detail with reference to FIGS. 2 to 5 .

In step 31, when the packet processing unit 111 recognizes the connection of any one of the underground terminals 4 among the plurality of user terminals 4 by monitoring the packets received by the lower communication unit 19, the terminal management unit 11 is By adding the ID, IP address, and location information of the underground terminal 4 connected to the monitoring communication device 1 to the emergency communication group data, the underground terminal 4 is registered in the emergency communication group. The user terminal 4 may be connected to the surrounding underground monitoring communication device 1 by wire or wirelessly. For example, the user terminal 4 may be connected by wire through a USB (Universal Serial Bus) port, or may be connected wirelessly using Wi-Fi communication.

A number of power facilities are installed in the underground common area, and in order to manage them, several managers use their own terminals (4) to simultaneously monitor and check the power facilities. A certain manager connects his/her terminal to the surrounding underground monitoring communication device (1), and another manager connects his/her terminal to another underground monitoring communication device (1). Accordingly, most of the plurality of user terminals 4 are connected to the remote monitoring and control system of the present embodiment, and the plurality of user terminals 4 are registered in the emergency communication group. Since the inspection of power facilities in the underground common area is mostly performed by one manager, most of the plurality of user terminals registered in the emergency communication group are the ground terminals 4 , and one corresponds to the underground terminal 4 . Hereinafter, a description will be made on the assumption that a plurality of terrestrial terminals 4 are registered in the emergency communication group, but one terrestrial terminal 4 may be registered in the emergency communication group.

An application for communicating with the underground monitoring communication device 1 is installed in each user terminal 4 according to the present embodiment. In the process of installing the application in each user terminal 4, the IP address of each user terminal 4 is automatically or manually generated. When an application is executed by a user of a certain user terminal 4 and the user terminal 4 is connected to the surrounding underground monitoring communication device 1 by wire or wirelessly, the user terminal 4 is connected to the underground monitoring communication device. It transmits an access packet including its ID and IP address to the device 1 . When the channel management unit 12 recognizes the connection of the user terminal 4 by receiving the connection packet through the lower communication unit 19, the ID and the IP address of the user terminal 4 are mapped and registered in the emergency communication group.

When a certain user terminal 4 connects to a certain underground monitoring communication device 1, the underground monitoring communication device 1 adds the ID, IP address, and location information of the user terminal 4 to the emergency communication group. In this way, the emergency communication group data stored in the storage 15 is updated. When the connection of a certain user terminal 4 is released, the underground monitoring communication device 1 stores the ID, IP address, and location information of the user terminal 4 in the storage 15 in such a way as to delete it from the emergency communication group. Update the saved emergency communication group data. In this way, whenever the emergency communication group data is updated, the underground monitoring communication device 1 that has updated the emergency communication group data transmits the update information of the emergency communication group to the other underground monitoring communication device 1 . Accordingly, emergency communication group data including IDs, IP addresses, and location information of all user terminals 4 currently connected to the remote monitoring and control system are stored in the storage 15 of each underground monitoring communication device 1 . will be saved

In this embodiment, the location information of each user terminal 4 indicates any one of the ground and the underground. When a certain user terminal (4) is connected to the underground monitoring communication device (1) that collects monitoring data from the electric power equipment installed in the underground tunnel among the plurality of underground monitoring communication devices (1), the underground monitoring communication device (1) is the user terminal The location information of (4) is set underground. When a certain user terminal (4) connects to the underground monitoring communication device (1) located near the entrance to the underground tunnel formed on the ground among the plurality of underground monitoring communication devices (1), the underground monitoring communication device (1) is the user terminal (4) ) to set the location information to the ground. Whether each user terminal 4 is located on the ground or underground may be manually set by the user's information input.

In step 32, the terminal management unit 11 is based on the location of each underground monitoring communication device 1 connected to each user terminal 4 registered in the emergency communication group, that is, each user terminal 4 registered in the emergency communication group. ), at least one terrestrial terminal 4 located on the ground is identified from among a plurality of user terminals 4 registered in the emergency communication group in step 32 . As shown in Figure 1, some of the plurality of underground monitoring and communication devices (1) are located near the entrance to the underground tunnel formed on the ground surface to communicate with the user terminal (4) located on the ground. As such, a certain underground monitoring communication device 1 may be connected to the user terminal 4 located on the ground by wire or wirelessly as it is located near the entrance of the underground common tunnel. The underground monitoring communication device 1 does not collect and provide monitoring data from underground power facilities, but serves to support communication between a plurality of user terminals 4 .

In step 33 , the terminal management unit 11 acquires the current communication state of each of the at least one terrestrial terminal 4 identified in step 32 . When the terminal management unit 11 generates a status request packet of a type for requesting information on the current communication state of each of the terrestrial terminals 4 with each of the at least one terrestrial terminal 4 identified in step 32 as a destination, the upper level The communication unit 18 transmits the status request packet to the at least one terrestrial terminal 4 identified in step 32 . Next, the upper communication unit 18 receives a status information packet including information on the current communication state of each terrestrial terminal 4 from each terrestrial terminal 4 as a response to the status request packet, and the terminal management unit 11 obtains the current communication status of each of the at least one terrestrial terminal 4 identified in step 32 from the received status information packet.

When each ground terminal 4 receives a status request packet from a certain underground monitoring communication device 1, it transmits a status information packet including information about its current communication status to the underground monitoring communication device 1 do. Each user terminal 4 may transmit a status information packet to all the underground monitoring communication devices 1 to notify the change without a request from the underground monitoring communication device 1 when its communication status is changed. The status request packet and the status information packet of this embodiment consist of unit packets conforming to the OSI standard, and other types of packets described below are the same.

In step 34, the terminal management unit 11 sets the underground terminal 4 connected to the underground monitoring communication device 1 as a destination, and information on the current communication state of each of the at least one terrestrial terminal 4 obtained in step 33 Generates a group information packet including, the lower communication unit 19 transmits the group information packet to the underground terminal (4). Upon receiving the group information packet from the underground monitoring communication device 1, the underground terminal 4 displays the ID and current communication status of each ground terminal 4 according to information included in the group information packet. The user of the underground terminal 4 selects any one of the terrestrial terminals 4 from among the plurality of terrestrial terminals 4 with reference to the ID and current communication state of each terrestrial terminal 4 displayed as described above, and thus selects the selected terrestrial terminal 4 . As an emergency communication channel with the terminal 4, any one emergency communication channel is selected from among a plurality of emergency communication channels. Subsequently, the underground terminal 4 transmits a channel establishment request packet including the ID of the ground terminal 4 selected by the user and the type of the emergency communication channel selected by the user to the underground monitoring communication device 1 .

FIG. 6 is an exemplary view of an application screen of the underground terminal 4 shown in FIG. 2 . According to the example shown in FIG. 6 , on the application screen of the underground terminal 4 , four ground terminals 4 that are currently connected to the remote monitoring and control system and capable of communication are displayed. The “selection” section on the application screen is a section for the user of the underground terminal 4 to select any one of the four terrestrial terminals 4 . The user can select any one of the four terrestrial terminals 4 by clicking the square icon in the "selection" section. 6 shows an example in which the terrestrial terminal 4 having an ID "C" is selected. The "connection" section is a section in which the current communication status of each terrestrial terminal 4 is displayed so that the user can decide which one of the four terrestrial terminals 4 to connect with. 6 shows an example in which the user terminal 4 having an ID of "B" is currently in a voice call. The "ID" section is a section in which the ID of each user terminal 4 is displayed. The user can select the other party who wants to make a call with reference to the ID of each user terminal 4 .

At the bottom of the application screen of the underground terminal 4, four channel icons corresponding to four emergency communication channels, that is, a voice call channel, a video call channel, a broadcast channel, and a bulletin board channel are displayed. By clicking any one of the four channel icons after the user clicks any one of the four square icons in the “selection” section, the user selects any one of the four terrestrial terminals 4 and connects with the selected terrestrial terminal 4 Any one of the four emergency communication channels can be selected as an emergency communication channel of When the user selection is completed, the underground terminal 4 sends a channel establishment request packet including the ID of each of the at least one terrestrial terminal 4 selected by the user and the type of the emergency communication channel selected by the user to the underground monitoring communication device. (1) is transmitted.

When the user selects a voice call channel or a video call channel, the user can select only one of the four terrestrial terminals 4 . This is because a voice call or a video call can be made only between the two user terminals 4 . When the user selects a broadcasting channel, it is a result of selecting all seven terrestrial terminals 4 even if the user selects any one of the four terrestrial terminals 4 or does not select any. This is because the broadcasting channel is used for the purpose of broadcasting to all terrestrial terminals. If the channel establishment request packet includes the broadcast channel type, it may not include the ID of the terrestrial terminal 4 selected by the user. When the user selects the bulletin board channel, the user can select any one or a plurality of the four terrestrial terminals 4 . This is because the bulletin board channel is used for the purpose of posting any text or image on at least one terrestrial terminal 4 .

In step 35, the packet processing unit 111 receives a channel establishment request packet of a type requesting establishment of any one type of emergency communication channel among a plurality of types of emergency communication channels from the underground terminal 4 through the lower communication unit 19? check As a result of the check in step 35 , if the channel establishment request packet is received from the underground terminal 4 , the process proceeds to step 36 . If the channel establishment request packet is not received from the underground terminal 4, the process returns to step 33, and the process of transmitting the status request packet, receiving the status information packet, and transmitting the group information packet is repeated. In this way, the process of monitoring the current communication state of each terrestrial terminal 4 and displaying the monitoring result on the underground terminal 4 continues until the channel management unit 12 confirms reception of the channel establishment request packet. During such monitoring, the communication state of each terrestrial terminal 4 may be changed.

In step 36, the channel management unit 12 determines that the type of emergency communication channel included in the channel establishment request packet received in step 35, that is, the type of emergency communication channel selected by the user of the underground terminal 4 is different from that of the underground terminal 4 and the ground terminal. It is checked whether the channel for a real-time call between the terminals 4 corresponds to one of a voice call channel and a video call channel. As a result of the check in step 36, if the type of the emergency communication channel selected by the user corresponds to any one of the voice call channel and the video call channel, the process proceeds to step 37; otherwise, the process proceeds to step 321.

In step 37, the channel management unit 12 determines the state of the voice communication channel and the video communication channel of the terrestrial terminal 4 having an ID included in the channel establishment request packet received in step 35, that is, the terrestrial terminal 4 selected by the user. check As a result of checking in step 37, if the state of the voice call channel or video call channel of the terrestrial terminal 4 selected by the user is in a busy state, the process proceeds to step 39, and the voice call channel or video of the other terminal 4 is performed. If the state of the call channel is in the idle state, step 38 is performed.

When the terminal management unit 11 generates a status request packet of a type requesting information on the current communication state of each ground terminal 4 with the terrestrial terminal 4 selected by the user as the destination, the upper communication unit 18 sends The status request packet is transmitted to the terrestrial terminal 4 selected by the user. Next, the upper communication unit 18 receives a status information packet including information on the current communication state of each terrestrial terminal 4 from each terrestrial terminal 4 as a response to the status request packet, and the channel management unit 12 confirms the status of the voice communication channel and the video communication channel of the terrestrial terminal 4 selected by the user from the received status information packet in this way.

In step 38, the channel management unit 12 generates a call unavailable message packet including a "call unavailable" message, and the lower communication unit 19 transmits the generated call unavailable message packet to the underground terminal 4 . After step 38, the process returns to step 33, and the process of transmitting the status request packet, receiving the status information packet, and transmitting the group information packet is repeated. The next three cases proceed to step 38 and the call unavailable message packet is transmitted to the underground terminal 4 . First, it is a case in which a plurality of terrestrial terminals 4 are selected by the user. A voice call or a video call is made one-to-one between one underground terminal 4 and one terrestrial terminal 4 . The second is a case in which the user selects the terrestrial terminal 4 in the current voice call or video call. Third, when the user selects the terrestrial terminal 4, the state of the voice communication channel or the video communication channel of the terrestrial terminal 4 is in the idle state, but is changed to the busy state at the confirmation in step 37.

In step 39, the channel management unit 12 checks whether the type of the emergency communication channel selected by the user corresponds to either a voice communication channel or a video communication channel. If the type of the emergency communication channel selected by the user corresponds to a voice call channel, the process proceeds to step 310, and if it corresponds to a video call channel, the process proceeds to step 311.

In step 310, the channel management unit 12 sets the state of the voice communication channel of the underground terminal 4 to the busy state, defines the ground terminal 4 selected by the user as a destination, and sends it to at least one power facility installed in the underground common area. A voice communication channel between the terrestrial terminal 4 and the underground terminal 4 selected by the user is established by creating a channel protocol that defines the packet transmission rate between the monitoring data and the voice call data according to the transmission amount of the monitoring data per unit time. When the underground monitoring communication device 1 connected to the terrestrial terminal 4 selected by the user also receives the voice call packet described below, the voice communication channel state of the terrestrial terminal 4 is set to the busy state. Accordingly, while the voice communication channel between the underground terminal 4 and the terrestrial terminal 4 selected by the user is established, each underground monitoring communication device 1 to which each of them is connected is connected to another underground monitoring communication device 1 It responds in a busy state to monitoring of

The underground monitoring communication device 1 of this embodiment transmits monitoring data for at least one power facility installed underground to the upper server 3 and the user terminal 4 that requested it. Most of the monitoring data is transmitted in real time to the upper server 3 and the user terminal 4 that requested it in order to monitor the current state of the power facility and its surroundings. Accordingly, before the user located on the ground enters the underground common pit, it is possible to check the power facility and its surrounding conditions. For example, when a fire occurs in an electric power facility or a toxic gas is generated in the underground pit, the user can take measures before entering the underground pit, thereby preventing human accidents. Real-time transmission of voice call data must also be ensured between the underground terminal 4 and the terrestrial terminal 4 selected by the user. This embodiment stipulates a packet transmission ratio between the monitoring data and the voice call data so that real-time transmission can be ensured for both the monitoring data and the voice call data.

In the present embodiment, the unit of the amount of data transmitted per unit time may be bits per second (bps), but may be other units. It is not easy to measure the transmission amount per unit time of the monitoring data for the underground power facility, and it causes a significant load on the underground monitoring communication device 1 . According to the present embodiment, the channel management unit 12 estimates the transmission amount per unit time of the monitoring data according to the type of at least one field device that provided the monitoring data, and the monitoring data according to the transmission amount per unit time of the monitoring data estimated in this way. It defines the packet transmission rate between and voice call data. The transmission amount per unit time of data transmitted through each emergency communication channel of this embodiment, such as voice call data, may be specified as a constant value in consideration of the performance of the underground monitoring communication device 1 .

The packet transmission rate of this embodiment is defined by the unit length and the number of units of the emergency communication packet, and the unit length and the number of the monitoring data packets. Here, the unit length of the emergency communication packet refers to the length of each of a plurality of unit packets constituting the emergency communication packet, and the unit number refers to the number of unit packets transmitted at once when the emergency communication packet is divided and transmitted. . Similarly, the unit length of the monitoring data packet means the length of each of a plurality of unit packets constituting the monitoring data packet, and the unit number means the number of unit packets transmitted at once when the monitoring data packet is divided and transmitted.

The storage 15 stores a transfer amount table in which an average transfer amount per unit time is recorded for each type of field device. The channel management unit 12 may estimate the transmission amount per unit time of monitoring data according to the type of at least one field device with reference to the transmission amount table stored in the storage 15 . When monitoring data is collected and provided from several field devices, the channel management unit 12 refers to the transmission amount table stored in the storage 15 and sums the transmission amount per unit time of monitoring data provided by a plurality of field devices by summing the monitoring data unit. It is possible to estimate the amount of transmission per hour.

In step 311, the sampling unit 13 determines the sampling rate of the video call data scheduled to be received from the underground terminal 4 according to the transmission amount per unit time of the monitoring data being received by the terrestrial terminal 4 selected by the user. For this sampling rate determination, the ground terminal 4 transmits information about the transmission amount per unit time of the monitoring data it is receiving, for example, the type of at least one field device that provided the monitoring data to the underground monitoring communication device 1 . can be sent to In step 314, which will be described below, the video call data received from the underground terminal 4 is sampled according to the determined sampling rate.

Since the transmission amount per unit time of video call data is very large compared to the transmission amount per unit time of voice call data, if the transmission amount per unit time of the monitoring data is also large when the terrestrial terminal 4 is receiving monitoring data, the packet transmission rate as described above Adjustment alone may not guarantee real-time video call and power facility monitoring. In this embodiment, by sampling the video call data received from the underground terminal 4, the size of the video call data can be reduced so that real-time transmission can be ensured for both the monitoring data and the video call data. If the sampling rate of the video call data is too low, image quality and sound quality are deteriorated, so that a video call between the user of the terrestrial terminal 4 and the user of the underground terminal 4 may not be smoothly performed. The sampling rate should be appropriately designed by bridging the real-time performance of video call and power facility monitoring and the smoothness of video call between the user of the ground terminal 4 and the user of the underground terminal 4 .

The sampling unit 13 estimates the transmission amount per unit time of the monitoring data according to the type of at least one field device that provided the monitoring data being received by the terrestrial terminal 4 selected by the user, and thus estimates the unit of the monitoring data. The sampling rate of the video call data received from the underground terminal 4 may be determined according to the transmission amount per hour. As described above, the storage 15 stores the transfer amount table in which the average transfer amount per unit time is recorded for each type of field device. The sampling unit 13 may estimate the transmission amount per unit time of monitoring data according to the type of at least one field device with reference to the transmission amount table stored in the storage 15 .

In step 312, the channel management unit 12 sets the state of the video communication channel of the underground terminal 4 to the busy state, defines the ground terminal 4 selected by the user as a destination, and connects to at least one power facility installed in the underground common area. A video call channel is established between the terrestrial terminal 4 and the underground terminal 4 selected by the user by creating a channel protocol that defines the packet transmission rate between the monitoring data and the video call data according to the transmission amount of the monitoring data per unit time. Like the voice call channel, the channel management unit 12 estimates the transmission amount per unit time of monitoring data according to the type of at least one field device that provided monitoring data, and monitoring data according to the transmission amount per unit time of the monitoring data estimated in this way. It defines the packet transmission rate between and video call data.

In step 313, the packet processing unit 111 monitors the packets received by the lower communication unit 19 so that the data received from the underground terminal 4 through the voice communication channel established in step 310 or the video communication channel established in step 312 is check if it exists When the lower communication unit 19 receives an emergency communication packet including the type of voice communication channel and voice communication data from the underground terminal 4 or an emergency communication packet including the type and video communication data of the video communication channel, the underground terminal This corresponds to the case in which data received from (4) through the voice communication channel or the video communication channel exists. As a result of the check in step 313 , if it is confirmed that data received from the underground terminal 4 through the voice call channel or the video call channel exists, step 312 is performed. Otherwise, the process proceeds to step 313.

In step 314, the channel management unit 12 receives the voice call channel established in step 310 or the video call channel established in step 312 from the underground terminal 4 according to the destination rule of the channel protocol created in step 310 or 312. Creates an emergency communication packet including the data, and generates a monitoring data packet including the monitoring data for the underground power facility. The channel management unit 12 generates an emergency communication packet having the IP address of the terrestrial terminal 4 selected by the user as the destination address according to the destination regulation of the channel protocol created in step 310, and the IP address of the upper server 3 and the IP address of at least one user terminal 4 that has requested monitoring data as a destination address to generate a monitoring data packet. In this case, the monitoring data packet consists of unit packets having the IP address of the upper server 3 as the destination address and unit packets having the IP address of each user terminal requesting the monitoring data as the destination address.

When data is received from the underground terminal 4 through the video call channel established in step 312, the sampling unit 13 receives data through the video call channel established in step 312 according to the sampling rate determined in step 311. sample Next, the channel management unit 12 generates an emergency communication packet including the data sampled as described above according to the destination regulation of the channel protocol generated in step 312, and generates a monitoring data packet including monitoring data for an underground power facility. do.

In step 315, the upper communication unit 18 transmits the emergency generated in step 314 through the voice call channel established in step 310 or the video call channel established in step 312 according to the packet transmission rate of the channel protocol created in step 310 or 312. The communication packet and the monitoring data packet are alternately transmitted to the terrestrial terminal 4 selected by the user. The upper communication unit 18 includes unit packets of the monitoring data packet corresponding to the number of monitoring data packets indicated by the packet transmission rate of the channel protocol generated in step 310 and the emergency communication packet corresponding to the number of emergency communication packets of the packet transmission rate. Unit packets are transmitted alternately. As described above, the monitoring data packet may be transmitted to the upper server 3 and another terrestrial terminal 4 .

For example, if voice call data or video call data is transmitted after monitoring data for an underground power facility is continuously transmitted for 5 seconds, the call between the user of the underground terminal 4 and the user of the ground terminal 4 is 5 seconds will be cut off to some extent. According to the OSI standard, the length of data that can be included in each unit frame in the Ethernet layer is 46~1500 bytes. An IP packet is created by attaching an IP header to the front of each unit frame. Accordingly, the length of the voice call data or video call data included in each unit packet of the monitoring data packet is adjustable.

The transmission amount per unit time of voice call data or video call data transmitted through the network is mostly constant, and the transmission amount per unit time of monitoring data transmitted through the network can be estimated from the type of the field device that provided the monitoring data. Therefore, the data length included in each unit packet of the emergency communication packet and the data length included in each unit packet of the monitoring data packet can be appropriately designed so that real-time monitoring data and real-time emergency call data can be guaranteed. . In this case, the upper communication unit 18 has a unit packet of an emergency communication packet having a length corresponding to the emergency communication packet unit length defined in the packet transmission rate and a length corresponding to the monitoring data packet unit length defined in the packet transmission rate. The unit packets of the monitoring data packet are transmitted alternately.

If the real-time performance of monitoring data and emergency call data cannot be guaranteed only by adjusting the unit packet length, the unit packet for emergency communication packets and monitoring data packets can be guaranteed so that the real-time properties of monitoring data and emergency call data can be ensured. may be appropriately designed to be transmitted in groups of several. In this case, the upper communication unit 18 sets unit packet bundles of emergency communication packets as many as the number corresponding to the number of emergency communication packet units defined in the packet transmission rate and the number corresponding to the number of monitoring data packet units defined in the packet transmission rate. Transmits unit packet bundles of monitoring data packets alternately.

In step 316, the packet processing unit 111 monitors the packets received by the lower communication unit 19 and through the voice communication channel established in step 310 or the video communication channel established in step 312 from the terrestrial terminal 4 selected by the user. Check whether the received data exists. When the upper communication unit 18 receives an emergency communication packet including the type of the voice communication channel and voice communication data from the terrestrial terminal 4 or the emergency communication packet including the type of the video communication channel and the video communication data, the terrestrial terminal This corresponds to the case in which data received from (4) through the voice communication channel or the video communication channel exists. As a result of the check in step 316 , if it is confirmed that the data received from the underground terminal 4 through the voice call channel or the video call channel exists, step 317 is performed. Otherwise, the process proceeds to step 319.

In step 317, the channel management unit 12 generates an emergency communication packet including data received from the terrestrial terminal 4 selected by the user through the voice call channel established in step 310 or the video call channel established in step 312, , create a monitoring data packet including monitoring data for underground power facilities. The channel management unit 12 generates an emergency communication packet having the IP address of the underground terminal 4 as the destination address according to the destination address of the emergency communication packet header received from the terrestrial terminal 4, and the IP of the underground terminal 4 Creates a monitoring data packet with an address as the destination address. This case corresponds to a case where the underground terminal 4 requests monitoring data.

In step 318, the lower communication unit 19 transmits the emergency voice call packet generated in step 312 through the voice call channel established in step 310 or the video call channel established in step 312 according to the packet transmission rate of the channel protocol created in step 310. and the monitoring data packets generated in step 312 are alternately transmitted to the underground terminal (4). The lower communication unit 19 includes unit packets of the monitoring data packet corresponding to the number of monitoring data packets indicated by the packet transmission rate of the channel protocol generated in step 310 and the emergency communication packet corresponding to the number of emergency communication packets of the packet transmission rate. Unit packets are transmitted alternately.

In step 319 , the channel management unit 12 checks whether a channel release request packet of a type requesting release of a voice call channel or a video call channel is received from either the underground terminal 4 or the terrestrial terminal 4 . As a result of the check in step 317 , if the channel release request packet is received from the underground terminal 4 , the process proceeds to step 318 . If the channel establishment request packet is not received from the underground terminal 4, return to step 313 and check whether there is data received from the underground terminal 4 or the terrestrial terminal 4 through the voice call channel or the video call channel. and the process of transmitting the emergency communication packet is repeated.

In step 320, the channel management unit 12 sets the state of the voice communication channel or the video call channel of the underground terminal 4 to the idle state, so that the voice communication channel between the underground terminal 4 and the terrestrial terminal 4 selected by the user or Disable the video call channel. When the voice communication channel or the video communication channel is released, data received through the corresponding channel is discarded. The terrestrial terminal 4 sets the state of its voice communication channel or video communication channel to the idle state and transmits a channel release request packet. When a channel release request packet is received from the underground terminal 4, the upper communication unit 18 sends the terrestrial terminal 4 to the terrestrial terminal 4 so that the state of its voice communication channel or video call channel can be set to an idle state. to send a channel release request packet.

In step 321, the packet processing unit 111 checks whether the type of the emergency communication channel selected by the user corresponds to the broadcast channel. As a result of the check in step 321, if the type of the emergency communication channel selected by the user corresponds to the broadcast channel, the process proceeds to step 322. Otherwise, that is, if the type of the emergency communication channel selected by the user corresponds to the bulletin board channel, the process proceeds to step 323.

In step 322, the channel management unit 12 defines all of the plurality of ground terminals 4 registered in the emergency communication group as destinations, and for the monitoring data packet including monitoring data for at least one power facility installed in the underground common pit. A broadcast channel is established between the plurality of terrestrial terminals (4) and the underground terminal (4) by creating a channel protocol that defines a packet transmission order for preferentially transmitting an emergency communication packet including data transmitted through a broadcast channel. The broadcasting channel is not a real-time call between the underground terminal 4 and the terrestrial terminal 4, but a channel for broadcasting voice, text, image, etc. to all of the plurality of terrestrial terminals 4 registered in the emergency communication group. There is no need to confirm, set, or cancel the channel.

In step 323, the channel management unit 12 defines at least one terrestrial terminal 4 selected by the user as a destination, and provides a bulletin board channel for a monitoring data packet including monitoring data for at least one power facility installed in an underground common pit. Establishes a bulletin board channel between at least one terrestrial terminal (4) and an underground terminal (4) selected by the user by creating a channel protocol that defines a packet transmission order that prioritizes emergency communication packets including data transmitted through . The bulletin board channel is not a real-time call between the underground terminal 4 and the ground terminal 4, but a channel for posting text, images, etc. to at least one ground terminal 4, so it is necessary to check or set the channel status, or to cancel the channel none.

In step 324, the channel management unit 12 includes data received from the underground terminal 4 through the broadcast channel established in step 322 or the bulletin board channel established in step 323 according to the destination rule of the channel protocol created in step 310. An emergency communication packet is generated, and a monitoring data packet including monitoring data for an underground power facility is generated. When data is received from the underground terminal 4 through the broadcast channel established in step 322, the channel management unit 12 sets the IP address of each of the plurality of terrestrial terminals 4 registered in the emergency communication group as the destination address. Creates a communication packet. When data is received from the underground terminal 4 through the bulletin board channel established in step 323, the channel management unit 12 sets the IP address of each of the at least one terrestrial terminal 4 selected by the user as a destination address for emergency communication. create a packet The destination address setting of the monitoring data packet is processed in the same way as in step 314 .

In step 325, the upper communication unit 18 transmits the monitoring data packet generated in step 324 through the broadcast channel established in step 322 or the bulletin board channel established in step 323 according to the packet transmission order of the channel protocol created in step 322 or 323. In priority, the emergency communication packet generated in step 324 is transmitted to all of the plurality of terrestrial terminals 4 registered in the emergency communication group or to at least one terrestrial terminal 4 selected by the user. That is, the upper communication unit 18 transmits the monitoring data packet generated in step a24 after transmitting the emergency communication packet generated in step 324 . Since data transmission through the broadcasting channel established in step 322 or the bulletin board channel established in step 323 is a one-time transmission, it does not affect the real-time transmission of monitoring data.

So far, preferred embodiments of the present invention have been mainly looked at. Those of ordinary skill in the art to which the present invention pertains will understand that the present invention can be implemented in a modified form without departing from the essential characteristics of the present invention. Therefore, the disclosed embodiments are to be considered in an illustrative rather than a restrictive sense. The scope of the present invention is indicated in the claims rather than the foregoing description, and all differences within the scope equivalent thereto should be construed as being included in the present invention.

1 ... underground monitoring communication device
2 ... network switch
3 ... parent server
4 ... user terminal
11 ... terminal management unit
12 ... Channel Management Department
13 ... sampling unit
14 ... data collection unit
15 ... storage
16 ... diagnostic department
17 ... user interface
18 ... Ministry of Upper Communication
19 ... Ministry of Lower Communication
110 ... switching
111 ... packet processing unit

Claims (10)

The underground monitoring communication device may include: identifying at least one ground terminal located on the ground from among a plurality of user terminals;
obtaining, by the underground monitoring communication device, a current communication state of each of the identified at least one terrestrial terminal;
transmitting, by the underground monitoring communication device, the group information packet including information on the current communication state of each of the at least one terrestrial terminal, to an underground terminal located underground among the plurality of user terminals;
The underground monitoring communication device generates a channel protocol that defines a packet transmission rate between the monitoring data and the voice call data according to the transmission amount per unit time of monitoring data for at least one power facility located underground by the user of the underground terminal. establishing a voice communication channel between the selected terrestrial terminal and the underground terminal; and
The underground monitoring communication device alternately selects an emergency communication packet including data received through the established voice communication channel and a monitoring data packet including the monitoring data according to the channel protocol generated in the voice communication channel establishment step. An underground monitoring communication method comprising the step of transmitting to a terrestrial terminal. The method of claim 1,
In the step of alternately transmitting according to the channel protocol generated in the step of establishing the voice communication channel, the unit packet of the emergency communication packet having a length corresponding to the unit length of the emergency communication packet defined in the packet transmission rate and the packet transmission rate defined in the packet transmission rate An underground monitoring communication method, characterized in that the unit packets of the monitoring data packet having a length corresponding to the unit length of the monitoring data packet are transmitted alternately. 3. The method of claim 2,
The step of alternately transmitting according to the channel protocol generated in the step of establishing the voice communication channel is defined in the packet transmission rate and the number of unit packet bundles of emergency communication packets as many as the number corresponding to the number of emergency communication packet units defined in the packet transmission rate. An underground monitoring communication method, characterized in that the unit packet bundles of monitoring data packets as many as the number corresponding to the unit number of monitoring data packets are alternately transmitted. The method of claim 1,
In the step of establishing the voice communication channel, the transmission amount per unit time of the monitoring data is estimated according to the type of at least one field device providing the monitoring data, and the monitoring data and the transmission amount per unit time of the estimated monitoring data are performed. An underground monitoring communication method, characterized in that it defines a packet transmission rate between the voice call data. The method of claim 1,
Receiving the channel establishment request packet including the ID of the terrestrial terminal selected by the user and the type of the emergency communication channel selected by the user from among a plurality of types of emergency communication channels from the underground terminal receiving the group information packet;
The step of establishing the voice communication channel comprises establishing the voice communication channel when the type of the selected emergency communication channel corresponds to the voice communication channel. 6. The method of claim 5,
If the type of emergency communication channel selected by the user is a video call channel, the selected terrestrial terminal and the underground terminal are generated by creating a channel protocol that defines a packet transmission rate between the monitoring data and the video call data according to the transmission amount per unit time of the monitoring data. establishing a video call channel between the two; and
Alternately transmitting an emergency communication packet including data received through the established video call channel and a monitoring data packet including the monitoring data to the selected terrestrial terminal according to the channel protocol generated in the video call channel establishment step Underground monitoring communication method, characterized in that it further comprises. 7. The method of claim 6,
determining a sampling rate of video call data according to the transmission amount per unit time of monitoring data being received by the terrestrial terminal selected by the user; and
Sampling the data received through the established video call channel according to the determined sampling rate,
The step of alternately transmitting according to the channel protocol generated in the video call channel establishment step generates an emergency communication packet including the sampled data and the monitoring data packet. 6. The method of claim 5,
When the type of the emergency communication channel selected by the user corresponds to the broadcast channel, the packet transmission order for preferentially transmitting the emergency communication packet including the data transmitted through the broadcast channel with respect to the monitoring data packet including the monitoring data is defined. establishing a broadcasting channel between all of the at least one terrestrial terminal located on the ground and the underground terminal by creating a channel protocol; and
In accordance with the channel protocol generated in the broadcasting channel establishment step, an emergency communication packet including data received through the established broadcasting channel is prioritized over the monitoring data packet including the monitoring data, at least one terrestrial location located on the ground. Underground monitoring communication method, characterized in that it further comprises the step of transmitting to the entire terminal. The method of claim 1,
When the type of the emergency communication channel selected by the user corresponds to the bulletin board channel, it is for the monitoring data packet including the monitoring data, which determines the packet transmission order of preferentially transmitting the emergency communication packet including the data transmitted through the bulletin board channel establishing a bulletin board channel between at least one terrestrial terminal and the underground terminal by the user by creating a channel protocol; and
According to the channel protocol generated in the step of establishing the bulletin board channel, an emergency communication packet including data received through the established bulletin board channel is transmitted to the selected at least one terrestrial terminal in preference to the monitoring data packet including the monitoring data. Underground monitoring communication method, characterized in that it further comprises the step of. a terminal management unit for identifying at least one terrestrial terminal located on the ground among a plurality of user terminals and acquiring a current communication state of each of the identified at least one terrestrial terminal;
a lower level communication unit for transmitting a group information packet including information on the current communication state of each of the at least one terrestrial terminal obtained from the plurality of user terminals to an underground terminal located underground;
The ground terminal selected by the user of the underground terminal and the underground terminal by creating a channel protocol that defines a packet transmission rate between the monitoring data and the voice call data according to the transmission amount per unit time of the monitoring data for at least one power facility located underground a channel management unit for establishing a voice communication channel between terminals; and
and an upper communication unit for alternately transmitting an emergency communication packet including data received through the established voice communication channel and a monitoring data packet including the monitoring data to the selected terrestrial terminal according to the generated channel protocol. An underground monitoring and communication system.

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