KR20230143685A - Wireless backhaul system using tvws for indoor and underground tunnels where gps reception is not avaiable - Google Patents

Abstract

A wireless backhaul system using TVWS is provided. The wireless backhaul system using TVWS, according to the present disclosure, may include a fixed master TVWS device, a fixed slave TVWS device, and a TVWS DB server which provides available TVWS channel information based on the location information of the fixed master TVWS device and the location information of the fixed slave TVWS device.

Description

Wireless backhaul system using TVWS for use indoors and underground tunnels where GPS reception is not possible {WIRELESS BACKHAUL SYSTEM USING TVWS FOR INDOOR AND UNDERGROUND TUNNELS WHERE GPS RECEPTION IS NOT AVAIABLE}

This disclosure relates to a wireless backhaul system using TVWS for use indoors and underground tunnels where GPS reception is not possible.

As the world population of 4.2 billion in 2018 is expected to increase significantly to 6.3 billion in 2050, large-scale underground civil engineering and construction work is gradually increasing to solve problems such as road traffic in large cities. Because a communication network has not been established, real-time communication and 24-hour on-site monitoring are impossible among field offices, supervisory agencies, headquarters, and research institutes.

At civil engineering and construction sites, there are concerns about casualties due to various incidents and accidents due to the absence of underground communication networks, so it is urgent to prepare countermeasures. In particular, tunnel construction sites are environments where mobile communication services are difficult to provide, so mobility and disaster emergencies are necessary. When considering the installation of a communication network, installing wired optical cables is also problematic as it is not easy.

Underground tunnels have steel structures and firewalls that require non-line-of-sight communication, making it impossible to use 2.4GHz and 5GHz Wi-Fi bridges, which can only be used in visible ranges. Therefore, TVWS capable of non-line-of-sight communication is needed.

TVWS is divided into fixed and mobile devices. Since mobile TVWS devices are assigned available channels from the TVWS DB server based on master GPS coordinates alone, when installing mobile TVWS devices indoors or in underground tunnels, a GPS repeater can be used to provide GPS signals to the master TVWS device.

However, for fixed TVWS devices, both the master TVWS device and slave TVWS devices must receive GPS signals to be allocated available channels from the TVWS DB server. In reality, even slave TVWS devices installed indoors or deep in underground tunnels can receive GPS signals through a GPS repeater. It is relatively difficult to convey.

In indoor and underground tunnels, there are steel structures and firewalls, and non-line-of-sight communication is required. In addition, long-distance services of more than 10km are required, so a method of utilizing fixed TVWS devices in underground tunnels is required.

The purpose of this disclosure is to provide a communication network wireless backhaul system using TVWS that enables the use of fixed TVWS devices capable of long-distance communication indoors and underground tunnels where GPS reception is not possible.

As a technical means for achieving the above-described technical problem, the first aspect of the present disclosure is to use a fixed master TVWS device, a fixed slave TVWS device, and the location information of the fixed master TVWS device and the location information of the fixed slave TVWS device. It includes a TVWS DB server that provides available TVWS channel information, and the fixed master TVWS device receives available TVWS channel information by providing preset fixed master TVWS device installation location information to the TVWS DB server, and receives available TVWS channel information. Data is transmitted and received based on information, and the fixed slave TVWS device provides preset fixed slave TVWS device installation location information to the TVWS DB server through the fixed master TVWS device, and provides available TVWS channel information from the fixed master TVWS device. It is possible to provide a wireless backhaul system using TVWS that receives and transmits and receives data based on the received available TVWS channel information.

According to the present disclosure, it is possible to provide a wireless backhaul system using TVWS that enables the use of fixed TVWS devices capable of long-distance communication indoors and underground tunnels where GPS reception is not possible.

Figure 1 is a diagram showing the configuration of a wireless backhaul system using TVWS to provide data services in a tunnel according to an embodiment.
Figure 2 is a diagram showing the configuration of a fixed master TVWS device according to an embodiment.
Figure 3 is a diagram showing the configuration of a fixed slave TVWS device according to an embodiment.

Below, with reference to the attached drawings, embodiments of the present disclosure will be described in detail so that those skilled in the art can easily implement the present disclosure. However, the present disclosure may be implemented in many different forms and is not limited to the embodiments described herein. In order to clearly explain the present disclosure in the drawings, parts that are not related to the description are omitted, and similar parts are given similar reference numerals throughout the specification.

Throughout the specification, when a part is said to be "connected" to another part, this includes not only the case where it is "directly connected," but also the case where it is "electrically connected" with another element in between. . Additionally, when a part "includes" a certain component, this means that it may further include other components, rather than excluding other components, unless specifically stated to the contrary.

Hereinafter, the present disclosure will be described in detail with reference to the attached drawings, but prior to this, TVWS band communication will first be summarized.

TVWS is defined as a temporally and spatially unused and empty channel in the TV band. Frequencies that can include TVWS are defined only in the 470~698 MHz (UHF) band in Korea, but in the United States, they are defined in the 54~216 MHz and 470~698 MHz bands, including the VHF band. In this way, data communication using an empty channel in the TV band can be called TVWS communication.

Since these TVWS communications share TV bands, regulatory authorities stipulate technical standards for TVWS devices that use TVWS and database access conditions to check available channels.

Meanwhile, TVWS devices can be classified into fixed TVWS devices and mobile TVWS devices. Fixed TVWS devices can transmit at 30dBm/6MHz and 33dBm/12MHz, and TVWS available channel information must be allocated from the TVWS database server based on the locations of the master TVWS device and slave TVWS device.

The mobile TVWS device is a device that can transmit with a power of up to 100mW/6MHz in channels more than 6MHz away from the broadcast band or up to 40mW/6MHz in channels adjacent to the broadcast band. The TVWS available channel information of the mobile TVWS device must be assigned to the TVWS database server based on the location of the master TVWS device.

According to the administrative rules 'Technical standards for wireless equipment for wireless stations that can be opened without reporting', which are currently announced by the Ministry of Science and ICT and the wireless equipment regulations, devices that connect to the TVWS database server must have an automatic positioning function. It stipulates that users should not be able to arbitrarily modify location information.

According to the current administrative rules, mobile TVWS devices can be used to implement a wireless backhaul system in underground tunnels, but relay implementation of TVWS signals is not possible, and mobile TVWS devices can operate normally at around 700m based on the visible distance. Therefore, it is difficult to implement services up to invisible distances.

Accordingly, in this disclosure, in order to use fixed TVWS technology that can transmit wireless data at high speed over a distance of 10 km or more in consideration of tunnel non-line-of-sight service, the TVWS device that connects to the TVWS database server has, in addition to the automatic positioning function, the device. It can include a function to store preset location information corresponding to the installation location. Such preset location information can be stored at the production stage of the TVWS device.

Figure 1 is a diagram showing the configuration of a wireless backhaul system using TVWS to provide data services in a tunnel according to an embodiment.

Referring to FIG. 1, a wireless backhaul system using TVWS installed in a tunnel according to an embodiment will include a fixed master TVWS device 100 installed at the tunnel entrance and a fixed slave TVWS device 200 installed inside the tunnel. You can.

The fixed master TVWS device 100 according to one embodiment may be installed at a certain distance at a tunnel entrance or multiple tunnel entrances. At this time, the fixed master TVWS device 100 may be fixedly installed by being attached to a specific location, or may be non-fixedly installed in a specific location with a separate moving means such as wheels attached.

The fixed master TVWS device 100 according to an embodiment may store preset fixed master TVWS device installation location information. The preset fixed master TVWS device installation location information stored by the fixed master TVWS device 100, for example, confirms in advance the location where the fixed master TVWS device 100 will be installed during the production stage of the fixed master TVWS device 100. Thus, it can be stored in advance in the memory included in the fixed master TVWS device 100.

At this time, during the initial setup process through connection with the TVWS DB server 500 after installation, the fixed master TVWS device 100 provides the preset fixed master TVWS device installation location information to the TVWS DB server 500 to select available TVWS channels. Information can be received and data transmission and reception can begin based on the received available TVWS channel information.

Meanwhile, the fixed master TVWS device 100 according to an embodiment may receive a GSP signal through a GPS module to confirm the location where the fixed master TVWS device 100 is currently installed. The fixed master TVWS device 100 may acquire location information using the received GPS signal and provide the obtained location information to the TVWS DB server 500.

For example, the fixed master TVWS device 100 may perform data transmission and reception by providing fixed master TVWS device installation location information set at the time of initial installation to the TVWS DB server 500 and obtaining available TVWS channel information. Afterwards, it can be moved away from the installation location, especially to a specific location outside the tunnel, and at this time, the fixed master TVWS device 100 can receive the GSP signal through the GPS module.

When a GPS signal is received, the fixed master TVWS device 100 can acquire fixed master TVWS device movement location information based on the received GPS signal. When the fixed master TVWS device movement location information is acquired, the fixed master TVWS device 100 compares the previously set fixed master TVWS device installation location information stored with the newly acquired fixed master TVWS device movement location information, and compares the fixed master TVWS device movement location information. The moving distance of (100) can be calculated.

At this time, if it is determined that the fixed master TVWS device 100 has moved more than a preset distance, the fixed master TVWS device 100 may stop all operations. For example, the fixed master TVWS device 100 may stop operating when it is determined that the distance the fixed master TVWS device 100 has moved is more than 50 m.

In this way, when the fixed master TVWS device 100 is moved and a GPS signal is received, the fixed master TVWS device 100 operates normally when moved by a distance of less than 50 m from the installation location initially set by the manufacturer. It can be maintained, and the output may be blocked if the distance exceeds 50m.

In order to select a channel to use, the fixed master TVWS device 100 according to an embodiment may obtain available channel information from the TVWS DB server 500 based on preset fixed master TVWS device installation location information. Available channel information can be obtained by sending an available channel information request message including one's location information to the TVWS DB server 500 connected to the TCP/IP network and receiving available channel information from the TVWS DB server 500. You can.

The fixed slave TVWS device 200 according to one embodiment may be installed at certain distances inside the tunnel.

The fixed slave TVWS device 200 according to an embodiment may store preset fixed slave TVWS device installation location information. The preset fixed slave TVWS device installation location information stored by the fixed slave TVWS device 200 is, for example, confirmed in advance at the location where the fixed slave TVWS device 200 will be installed during the production stage of the fixed slave TVWS device 200. Thus, it can be stored in advance in the memory included in the fixed slave TVWS device 200.

At this time, during the initial setup process of the fixed slave TVWS device 200 through connection with the TVWS DB server 500 after installation, the preset fixed master TVWS device installation location information is transmitted to the TVWS DB server through the fixed master TVWS device 100. 500, and available TVWS channel information can be received from the TVWS DB server 500 through the fixed master TVWS device 100. The fixed slave TVWS device 200 may start transmitting and receiving data based on the received available TVWS channel information.

Meanwhile, the fixed slave TVWS device 200 according to an embodiment may receive a GSP signal through a GPS module to confirm the location where the fixed slave TVWS device 200 is currently installed. The fixed slave TVWS device 200 acquires location information using the received GPS signal, and sends the acquired location information to the TVWS DB server 500 through the fixed master TVWS device 100. can be provided.

For example, the fixed slave TVWS device 200 provides preset fixed slave TVWS device installation location information at the time of initial installation to the TVWS DB server 500 through the fixed master TVWS device 100 and obtains available TVWS channel information. By doing so, data transmission and reception can be performed, but it can then be moved away from the installation location, especially to a specific location outside the tunnel, and in this case, the fixed slave TVWS device 200 can receive the GSP signal through the GPS module.

When a GPS signal is received, the fixed slave TVWS device 200 can obtain movement location information of the fixed slave TVWS device based on the received GPS signal. When the fixed slave TVWS device movement location information is acquired, the fixed slave TVWS device 200 compares the stored preset fixed slave TVWS device installation location information with the newly acquired fixed slave TVWS device movement location information, and determines the fixed slave TVWS device. The moving distance of (200) can be calculated.

At this time, if it is determined that the fixed slave TVWS device 200 has moved more than a preset distance, the fixed slave TVWS device 200 may stop all operations. For example, the fixed slave TVWS device 200 may stop operating when it is determined that the distance that the fixed slave TVWS device 200 has moved is more than 50 m.

In this way, when a GPS signal is received by moving the fixed slave TVWS device 200, the fixed slave TVWS device 200 operates normally when moved a distance of less than 50 m from the installation location initially set by the manufacturer. It can be maintained, and the output may be blocked if the distance exceeds 50m.

A wireless backhaul system using TVWS according to an embodiment is installed in a tunnel and can be used to determine the locations of tunnel users and tunnel workers.

In the tunnel where the wireless backhaul system using TVWS is installed, for example, a plurality of RFID (Radio-Frequency Identification) readers that transmit and receive data through wireless backhaul are installed at a preset distance (e.g., about 300m distance). It can be. At this time, an RFID tag that can be recognized by an RFID reader is installed on the helmet of a worker entering the tunnel, and the RFID reader is divided into a fixed master TVWS device (100) installed at the tunnel entrance and a fixed slave TVWS device (200) installed inside the tunnel. Through the configured wireless backhaul system, information about RFID tag recognition can be transmitted to the server that processes information about safety management within the tunnel.

For example, there are two RF passes of the RFID reader used to determine the location of tunnel entrants and tunnel workers, and the two RF passes can be turned on/off respectively and used to recognize the worker's direction. Since RFID readers are installed in preset distance units, if a worker in the tunnel is within the recognition range of a specific RFID reader, the RFID reader can transmit information about the worker's specific location to the wireless backhaul system.

On the other hand, if the worker in the tunnel is outside the recognition range of a specific RFID reader, the RF pass on/off of the RFID reader in the movement path is turned on/off according to the worker's movement in the tunnel, so multiple RFID readers maintain the RF pass status. These can be compared to each other to convey information to the wireless backhaul system about the worker's approximate location (e.g., a specific tunnel section).

At this time, the server that receives information about the worker's location from the wireless backhaul system using TVWS installed in the tunnel can determine the number of people entering the tunnel and the location of the tunnel worker, and display the tunnel worker status information on the tunnel's field office monitor.

Meanwhile, a wireless backhaul system using TVWS according to an embodiment can be installed in a tunnel and used for data communication of IoT sensors including sealed gas sensors, etc. For example, a wireless backhaul system using TVWS can analyze environmental information in a tunnel received from IoT sensors and display this as tunnel environment status information on the tunnel's field office monitor. If CCTV camera images are displayed on the tunnel's field office monitor, tunnel environmental status information may be displayed simultaneously with the CCTV camera images on the tunnel's field office monitor.

In this way, the communication network wireless backhaul system using TVWS of the present disclosure enables the use of fixed TVWS devices capable of long-distance communication in tunnels where GPS reception is not possible, making safety management within the tunnel easier based on devices such as RFID readers and IoT sensors. It has the advantage of being able to be performed easily.

Figure 2 is a diagram showing the configuration of a fixed master TVWS device according to an embodiment.

Referring to FIG. 2, the fixed master TVWS device 100 according to an embodiment is connected to a server through a TVWS module 1001 and a wide area network (WAN) for TVWS band communication with the fixed slave TVWS device 200 to transmit data. A network interface 1002 that performs communication, a CPU and memory 1003 that control the operation of the fixed master TVWS device 100 and store preset fixed master TVWS device installation location information, and when a GPS signal is received, receive Supplying power to the GPS receiver (1004), which acquires movement location information of the fixed master TVWS device based on a GPS signal, the Wi-Fi module (1005) for communicating with information and communication devices located nearby, and the fixed master TVWS device (100) It may include a power supply 1006 for.

Figure 3 is a diagram showing the configuration of a fixed slave TVWS device according to an embodiment.

Referring to FIG. 3, a fixed slave TVWS device 200 according to an embodiment includes a fixed master TVWS device 100, a TVWS module 2001 that transmits and receives data using a TVWS channel, and a local area network (LAN). a network interface (2002) that communicates with other fixed master TVWS through a network interface (2002), a CPU and memory (2003) that control the operation of the fixed slave TVWS device (200) and store preset fixed slave TVWS device installation location information, and a GPS signal. When received, a GPS receiver (2004) acquires movement location information of a fixed slave TVWS device based on the received GPS signal, a Wi-Fi module (2005) for communicating with nearby information and communication devices, and a fixed slave TVWS device (200). ) may include a power supply (2006) for supplying power to the device.

The Wi-Fi module 1005 of the fixed master TVWS device 100 and the Wi-Fi module 2005 of the fixed slave TVWS device 200 can provide communication services within the tunnel. That is, the information and communication devices located in the tunnel connect to each TVWS device through, for example, the Wi-Fi module 1005 of the fixed master TVWS device 100 and the Wi-Fi module 2005 of the fixed slave TVWS device 200, Data can be transmitted and received reliably within an underground tunnel.

The foregoing description of the present disclosure is for illustrative purposes, and a person skilled in the art to which the present disclosure pertains will understand that the present disclosure can be easily modified into other specific forms without changing its technical idea or essential features. will be. Therefore, the embodiments described above should be understood in all respects as illustrative and not restrictive. For example, each component described as unitary may be implemented in a distributed manner, and similarly, components described as distributed may also be implemented in a combined form.

The scope of the present disclosure is indicated by the claims described below rather than the detailed description above, and all changes or modified forms derived from the meaning and scope of the claims and their equivalent concepts should be construed as being included in the scope of the present disclosure. do.

Claims (5)

In a wireless backhaul system using TVWS to provide data communication using the TVWS band,
Fixed master TVWS device;
Fixed slave TVWS device; and
A TVWS DB server that provides available TVWS channel information based on the location information of the fixed master TVWS device and the location information of the fixed slave TVWS device,
The fixed master TVWS device provides preset fixed master TVWS device installation location information to the TVWS DB server, receives available TVWS channel information, and transmits and receives data based on the received available TVWS channel information,
The fixed slave TVWS device provides preset fixed slave TVWS device installation location information to the TVWS DB server through the fixed master TVWS device, receives available TVWS channel information from the fixed master TVWS device, and selects the received available TVWS channel. Sending and receiving data based on information
Wireless backhaul system using TVWS. According to paragraph 1,
The fixed master TVWS device is
a TVWS module that transmits and receives data using the fixed slave TVWS device and a TVWS channel;
A network interface that is connected to a server through a wide area communication network and performs data communication;
a CPU and memory that control the operation of the fixed master TVWS device and store the preset fixed master TVWS device installation location information;
When a GPS signal is received, a GPS receiver that acquires movement location information of the fixed master TVWS device based on the received GPS signal;
Wi-Fi module for communicating with information and communication devices; and
Including a power supply for supplying power to the fixed master TVWS device.
Wireless backhaul system using TVWS. According to paragraph 2,
The fixed master TVWS device is
When the fixed master TVWS device movement location information is acquired, the preset fixed master TVWS device installation location information is compared with the fixed master TVWS device movement location information, and it is determined that the fixed master TVWS device has moved more than a preset distance. If so, it stops working
Wireless backhaul system using TVWS. According to paragraph 1,
The fixed slave TVWS device is
a TVWS module that transmits and receives data using the fixed master TVWS device and a TVWS channel;
a network interface that communicates with other fixed master TVWSs through a local area network;
a CPU and memory that control the operation of the fixed slave TVWS device 200 and store the preset fixed slave TVWS device installation location information;
When a GPS signal is received, a GPS module that acquires movement location information of a fixed slave TVWS device based on the received GPS signal;
Wi-Fi module for communicating with information and communication devices; and
A power supply for supplying power to the fixed slave TVWS device; including
Wireless backhaul system using TVWS. According to paragraph 4,
The fixed slave TVWS device is
When the fixed slave TVWS device movement location information is obtained, the preset fixed slave TVWS device installation location information is compared with the fixed slave TVWS device movement location information, and it is determined that the fixed slave TVWS device has moved more than a preset distance. If so, it stops working
Wireless backhaul system using TVWS.