WO2021034147A1 - Système de communication fournissant une communication de données par l'intermédiaire d'une bande d'espace blanc de télévision (tvws) - Google Patents

Système de communication fournissant une communication de données par l'intermédiaire d'une bande d'espace blanc de télévision (tvws) Download PDF

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Publication number
WO2021034147A1
WO2021034147A1 PCT/KR2020/011182 KR2020011182W WO2021034147A1 WO 2021034147 A1 WO2021034147 A1 WO 2021034147A1 KR 2020011182 W KR2020011182 W KR 2020011182W WO 2021034147 A1 WO2021034147 A1 WO 2021034147A1
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Prior art keywords
tvws
fixed
tvws device
slave
master
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PCT/KR2020/011182
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English (en)
Korean (ko)
Inventor
유호상
김영준
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이노넷 주식회사
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Publication of WO2021034147A1 publication Critical patent/WO2021034147A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W16/00—Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures
    • H04W16/14—Spectrum sharing arrangements between different networks
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/24—Reselection being triggered by specific parameters
    • H04W36/30—Reselection being triggered by specific parameters by measured or perceived connection quality data
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/24—Reselection being triggered by specific parameters
    • H04W36/32—Reselection being triggered by specific parameters by location or mobility data, e.g. speed data
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
    • H04W4/06—Selective distribution of broadcast services, e.g. multimedia broadcast multicast service [MBMS]; Services to user groups; One-way selective calling services
    • H04W4/10—Push-to-Talk [PTT] or Push-On-Call services
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W84/00—Network topologies
    • H04W84/18—Self-organising networks, e.g. ad-hoc networks or sensor networks
    • H04W84/20—Master-slave selection or change arrangements

Definitions

  • the present invention relates to a communication system capable of providing a public Wi-Fi service to a moving object using a TVWS band.
  • the location information of the terminal can be transmitted to a central server, and a convenient service that informs the bus user of the arrival time of the bus based on the location information has been provided.
  • data communication must be possible between the bus and the central server.
  • wireless communication is required.
  • mobile communication systems such as LTE, 5G, and WiBro are used as wireless communication for data transmission.
  • using such a euro mobile communication system may result in excessive operating costs because a monthly fee must be paid.
  • a wireless communication network configuration using a TVWS (television white space) band may also be a solution for solving the above-described problem.
  • the present invention provides a TVWS communication system capable of performing TVWS communication between a fixed master TVWS device disposed at a fixed position by placing a fixed slave TVWS device on a mobile body and a fixed slave TVWS device disposed on the mobile body.
  • the present invention is a TVWS server that allocates available TVWS channels based on location information of a fixed master TVWS device and location information of a fixed slave TVWS device, fixedly installed at a specific location, and receiving available TVWS channels from the TVWS server.
  • a fixed master TVWS device for determining a TVWS transmission/reception channel and a fixed slave TVWS device installed in the mobile body, transmitting location information to the fixed master TVWS device, and receiving a TVWS transmission/reception channel used for communication from the fixed master TVWS device. It provides a TVWS communication system including.
  • the mobile body moves along a fixed path
  • the fixed master TVWS device may determine a TVWS channel usable in all paths the mobile body travels as a TVWS transmission/reception channel.
  • the moving object moves along a fixed path
  • the TVWS server may block all paths that the moving object moves, and allocate TVWS channels available in each block.
  • the fixed master TVWS device may receive information on a TVWS channel available in a specific block determined based on the path of the mobile object from the TVWS server.
  • the fixed master TVWS device when the mobile object does not move along a fixed path, sets a specific area based on the location of the fixed master TVWS device, and is available for communication within the specific area.
  • the channel can be determined as a TVWS transmission/reception channel.
  • the TVWS communication system further includes a PTT server for providing a push-to-talk (PTT) service
  • the fixed slave TVWS device provides a PTT service from the PTT server through the fixed master TVWS device.
  • the fixed slave TVWS device may provide a PTT service to the terminal based on the information for providing the PTT service.
  • the fixed slave TVWS device uses a dual TVWS modem system, and the fixed slave TVWS device may determine whether to handover based on a received signal strength indicator (RSSI) according to a scanning method.
  • RSSI received signal strength indicator
  • the fixed slave TVWS device receives location information related to handover from the TVWS server through the fixed master slave TVWS device, and the fixed slave TVWS device includes location information of the fixed slave TVWS device and the Whether to handover may be determined based on location information related to handover.
  • the fixed slave TVWS device determines whether to handover based on the RSSI according to the scanning method when the coverage of the fixed master TVWS device is greater than or equal to a specific threshold, and the coverage of the fixed master TVWS device is If it is less than the specific threshold, whether to handover may be determined based on location information of the fixed slave TVWS device and location information related to the handover.
  • the communication system disclosed in the present invention can be configured without updating the TVWS DB server used in the related art.
  • the TVWS communication system can be continuously maintained.
  • a TVWS communication network is established between the fixed master TVWS device and the fixed slave TVWS device even when the mobile object moves in a fixed path as well as when the movement of the mobile object cannot be predicted. can do.
  • FIG. 1 is a configuration and operation scheme of a TVWS communication system according to a first embodiment of the present invention.
  • FIG. 2 is a configuration and operation scheme of a TVWS communication system according to a second embodiment of the present invention.
  • FIG. 3 is a configuration and operation scheme of a TVWS communication system according to a third embodiment of the present invention.
  • FIG. 4 is a diagram illustrating a configuration of a communication system when a TVWS communication system is applied to a moving cruise ship according to an embodiment of the present invention.
  • FIG. 5 is a diagram illustrating a configuration of a communication system when a TVWS communication system is applied to a moving train according to an embodiment of the present invention.
  • FIG. 6 is a diagram showing the configuration of a fixed TVWS device including a single TVWS modem according to an embodiment of the present invention.
  • FIG. 7 is a diagram showing the configuration of a fixed TVWS device including a dual TVWS modem according to an embodiment of the present invention.
  • 8A and 8B are a configuration and operation scheme of a TVWS communication system according to a fourth embodiment of the present invention.
  • first, second, A, and B may be used to describe various elements, but the elements should not be limited by the terms. These terms are used only for the purpose of distinguishing one component from another component. For example, without departing from the scope of the present invention, a first element may be referred to as a second element, and similarly, a second element may be referred to as a first element.
  • the term and/or includes a combination of a plurality of related listed items or any of a plurality of related listed items.
  • TVWS television white space
  • UHF 470 ⁇ 698MHz
  • VHF 54 ⁇ 216MHz
  • 470 ⁇ 698MHz bands including the VHF band.
  • Data communication using an empty channel in the TV band can be referred to as TVWS communication.
  • TVWS devices can be classified into fixed TVWS devices and mobile TVWS devices, and 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 location.
  • the mobile TVWS device is a device capable of transmitting with a power of up to 100mW/6MHz in a channel separated by 6MHz or more from the broadcast band, or 40mW/6MHz in a channel adjacent to the broadcast band.
  • TVWS available channel information of the mobile TVWS device must be received from the fixed TVWS device or allocated to the TVWS database server based on location.
  • TVWS devices connecting to the TVWS database server must have an automatic positioning function, and users must not be able to arbitrarily modify location information.
  • mobile TVWS devices that access the database should have a function to re-search for available channels when the power is re-applied and when the location is changed by more than 100 meters from the last location that received channel information in use.
  • a mobile TVWS device may be used to provide a wireless backhaul system for a communication network used in a bus or the like.
  • the mobile TVWS device has a small service coverage as described above, when the mobile TVWS device operates in combination with a moving object such as a bus, communication efficiency may decrease.
  • FIG. 1 is a configuration and operation scheme of a TVWS communication system according to a first embodiment of the present invention. More specifically, FIG. 1 shows a method of configuring a TVWS communication system by combining fixed TVWS devices 101 and 111 with a cruise ship 121.
  • the fixed master TVWS device 101 may be disposed in a port, and the fixed slave TVWS device 111 may be disposed in a moving cruise ship 121.
  • the coverage (service distance) of the fixed TVWS device 101 may be 10 km or more.
  • the fixed master TVWS device 101 when the fixed slave TVWS device 111 is separated by a specific distance from the fixed master TVWS device 101, the fixed master TVWS device 101 does not acquire the location information of the fixed slave TVWS device 111. Can't. According to various embodiments, when the fixed slave TVWS device 111 is separated by 600m or more from the fixed master TVWS device 101, the fixed master TVWS device 101 cannot obtain the location information of the fixed slave TVWS device 111. I can.
  • the cruise ship 121 including the fixed slave TVWS device 111 may move along a fixed path. That is, the cruise ship can move along a specific route or along a specific route within a certain numerical error range.
  • the fixed master TVWS device 101 is fixedly installed at a specific location (port 1), and may determine a TVWS transmission/reception channel by receiving an available TVWS channel from a TVWS server (not shown). According to various embodiments, the fixed master TVWS device 101 may transmit the determined TVWS channel to the fixed slave TVWS device 111, and the fixed master TVWS device 101 and the fixed slave TVWS device 111 through the determined TVWS channel. ) TVWS communication may be performed.
  • the fixed slave TVWS device 111 may transmit location information of the fixed slave TVWS device 111 to the fixed master TVWS device 101, and the fixed master TVWS device 101 is a fixed master TVWS server. Location information of the TVWS device 101 and location information of the fixed slave TVWS device 111 may be transmitted.
  • the TVWS server provides TVWS channels available within the coverage of the fixed master TVWS device 101 based on location information of the fixed master TVWS device 101 and location information of the fixed slave TVWS device 111. Can be assigned.
  • the fixed master TVWS device 101 As the fixed slave TVWS device 111 moves, when the fixed slave TVWS device 111 and the fixed master TVWS device 101 are separated by a specific distance or more, the fixed master TVWS device 101 is a fixed type. Location information of the fixed slave TVWS device 111 may not be received from the slave TVWS device 111. In this case, the fixed master TVWS device 101 predicts the position of the fixed slave TVWS device 101 after a certain time has elapsed in consideration of the movement characteristics (for example, speed, direction vector, etc.) of a moving object moving along a fixed path. can do.
  • the movement characteristics for example, speed, direction vector, etc.
  • the fixed master TVWS device 101 may update the received (or expected) location information of the fixed slave TVWS device 111 and the location information of the fixed master TVWS device 101 to the TVWS server. .
  • the fixed master TVWS device 101 may update the location information of the fixed slave TVWS device 111 and the location information of the fixed master TVWS device 101 to the TVWS server every 24 hours.
  • the TVWS server may allocate TVWS channels available within the coverage of the fixed master TVWS device based on the updated location information of the fixed slave TVWS device and the location information of the fixed master TVWS device.
  • the coverage limit of the fixed master TVWS device 101 may be 10 km. Therefore, when the cruise ship including the fixed slave TVWS device 111 is out of the coverage, the fixed slave TVWS device 111 may not be able to perform TVWS communication with the fixed master TVWS device 101. However, in this case, the fixed slave TVWS device 111 transmits the location information of the fixed slave TVWS device 111 to another fixed master TVWS device, and TVWS communication with another fixed master TVWS device may be performed based on this.
  • the outdoor microphone minimum protective separation distance may be 6 km.
  • the fixed master TVWS device 101 may determine a TVWS channel available in all paths of the cruise ship 121 as a TVWS transmission/reception channel for use in communication with the fixed slave TVWS device 111 .
  • a TVWS server used in a conventional TVWS communication system may be used as it is.
  • the fixed master TVWS device 101 is a fixed master TVWS device 101 at a position where the fixed master TVWS device 101 is disposed, and when the fixed slave TVWS device 111 is disposed in proximity to the fixed master TVWS device 101, the fixed slave TVWS Position of the device 111, the position while the fixed slave TVWS device 111 is moving, and the position of the fixed slave TVWS device 111 when the fixed slave TVWS device 111 is located farthest from the fixed master TVWS device 101
  • a channel commonly used in the TVWS may be determined as a TVWS transmission/reception channel.
  • the fixed master TVWS device 101 may inquire of the TVWS server for available TVWS transmission/reception channels at the above-mentioned four locations, and the TVWS transmission/reception channel based on a response result received from the TVWS server. You can decide.
  • FIG. 2 is a configuration and operation scheme of a TVWS communication system according to a second embodiment of the present invention. More specifically, FIG. 2 shows a method of configuring a TVWS communication system by combining the fixed TVWS devices 201 and 211 with the cruise ship 221.
  • the fixed master TVWS device 201 may be disposed in a port, and the fixed slave TVWS device 211 may be disposed in the moving cruise ship 221.
  • the coverage (service distance) of the fixed TVWS device 201 may be 10 km or more.
  • the cruise ship 221 including the fixed slave TVWS device 211 may move along a fixed path. That is, the cruise ship can move along a specific route or along a specific route within a certain numerical error range.
  • the fixed master TVWS device 201 is fixedly installed at a specific location (port 1), and may determine a TVWS transmission/reception channel by receiving an available TVWS channel from a TVWS server (not shown). According to various embodiments, the fixed master TVWS device 201 may transmit the determined TVWS channel to the fixed slave TVWS device (@11), and through the determined TVWS channel, the fixed master TVWS device 201 and the fixed slave TVWS device ( TVWS communication between 211) may be performed.
  • the fixed slave TVWS device 211 may transmit the location information of the fixed slave TVWS device 211 to the fixed master TVWS device 201, and the fixed master TVWS device 201 is a fixed master TVWS server. Location information of the TVWS device 201 and location information of the fixed slave TVWS device 211 may be transmitted.
  • the TVWS server provides TVWS channels available within the coverage of the fixed master TVWS device 201 based on location information of the fixed master TVWS device 201 and location information of the fixed slave TVWS device 211. Can be assigned.
  • the fixed master TVWS device 201 is Location information of the fixed slave TVWS device 211 may not be received from the fixed slave TVWS device 211. Meanwhile, in preparation for such a case, the TVWS server may block all paths that the cruise ship 221 travels and allocate TVWS channels available in each block. Accordingly, in this case, the fixed master TVWS device 201 may receive information on a TVWS channel available in a specific block determined based on the movement path of the cruise ship 221 from the TVWS server. According to various embodiments, according to the second embodiment shown in FIG.
  • An available channel for TVWS communication between the 201 and the fixed slave TVWS device 211 may be allocated and determined.
  • FIG. 3 is a configuration and operation scheme of a TVWS communication system according to a third embodiment of the present invention. More specifically, FIG. 3 is a diagram illustrating a communication system configuration method when a moving path of a fixed slave TVWS device is not predicted.
  • the fixed master TVWS device 301 may not be able to receive the location information of the fixed slave TVWS device from the fixed slave TVWS device. Accordingly, the fixed master TVWS device 301 It may not be possible to determine a TVWS transmission/reception channel for TVWS communication.
  • the fixed master TVWS device 301 may determine a TVWS transmission/reception channel assuming that the fixed slave TVWS device is located in a specific area. For example, the fixed master TVWS device 301 may predict that the fixed slave TVWS device is centered on the fixed master TVWS device 301 and is located inside a specific area with a radius of 10 km.
  • a first fixed slave TVWS device 311 is disposed at 12 o'clock in the specific area, and a second fixed slave TVWS device 312 is disposed at 1 o'clock.
  • a third fixed slave TVWS device 313 is disposed at 3 o'clock, a fourth fixed slave TVWS device 314 is disposed at 4 o'clock, and a fifth fixed slave TVWS device 315 is disposed at 6 o'clock.
  • the sixth fixed slave TVWS device 316 is disposed at 7 o'clock
  • the seventh fixed slave TVWS device 317 is disposed at 9 o'clock
  • the eighth fixed slave TVWS device 318 is disposed at 10 o'clock Can be assumed to be placed.
  • the fixed master TVWS device 301 is in all of the eight fixed slave TVWS devices 311, 312, 313, 314, 315, 316, 317, 318 and the fixed master TVWS device 301.
  • Available channels can be determined as TVWS transmission/reception channels.
  • FIG. 4 is a diagram illustrating a configuration of a communication system when a TVWS communication system is applied to a moving cruise ship according to an embodiment of the present invention.
  • the fixed master TVWS device 401 may be disposed in a port, and the fixed slave TVWS device 411 may be disposed in a moving cruise ship 421.
  • the coverage (service distance) of the fixed master TVWS device 401 may be 10 km or more.
  • the fixed master TVWS device 401 when the fixed slave TVWS device 411 is spaced apart by a specific distance from the fixed master TVWS device 401, the fixed master TVWS device 401 does not acquire the location information of the fixed slave TVWS device 411. Can't. According to various embodiments, when the fixed slave TVWS device 411 is separated by 600m or more from the fixed master TVWS device 401, the fixed master TVWS device 401 may not acquire the location information of the fixed slave TVWS device 411. I can.
  • the cruise ship 421 including the fixed slave TVWS device 411 may move along a fixed path. That is, the cruise ship can move along a specific route or along a specific route within a certain numerical error range.
  • the fixed master TVWS device 401 is fixedly installed at a specific location (port 1), and determines a TVWS transmission/reception channel by receiving an available TVWS channel from the TVWS server 431 through a TCP/IP network. I can. According to various embodiments, the fixed master TVWS device 401 may transmit the determined TVWS channel to the fixed slave TVWS device 411, and the fixed master TVWS device 401 and the fixed slave TVWS device 411 through the determined TVWS channel. ) TVWS communication may be performed.
  • the fixed slave TVWS device 411 may transmit location information of the fixed slave TVWS device 411 to the fixed master TVWS device 401, and the fixed master TVWS device 401 is a TVWS server 431 The location information of the fixed master TVWS device 401 and the location information of the fixed slave TVWS device 411 may be transmitted.
  • the TVWS server 431 is available within the coverage of the fixed master TVWS device 401 based on the location information of the fixed master TVWS device 401 and the location information of the fixed slave TVWS device 411. TVWS channels can be assigned.
  • the fixed master TVWS device 401 As the fixed slave TVWS device 411 moves, when the fixed slave TVWS device 411 and the fixed master TVWS device 401 are separated by a specific distance or more, the fixed master TVWS device 401 is a fixed type. Location information of the fixed slave TVWS device 411 may not be received from the slave TVWS device 411. In this case, the fixed master TVWS device 401 predicts the position of the fixed slave TVWS device 401 after a certain time period in consideration of the movement characteristics (eg, speed, direction vector, etc.) of a moving object moving along a fixed path. can do.
  • the movement characteristics eg, speed, direction vector, etc.
  • the fixed master TVWS device 401 updates the received (or expected) location information of the fixed slave TVWS device 411 and the location information of the fixed master TVWS device 401 to the TVWS server 431 can do.
  • the fixed master TVWS device 401 may update the location information of the fixed slave TVWS device 411 and the location information of the fixed master TVWS device 401 to the TVWS server 431 every 24 hours.
  • the TVWS server 431 may allocate TVWS channels available within the coverage of the fixed master TVWS device based on the updated location information of the fixed slave TVWS device and the location information of the fixed master TVWS device. have.
  • the fixed master TVWS device 401 may determine a TVWS channel available in all paths of the cruise ship 421 as a TVWS transmission/reception channel for use in communication with the fixed slave TVWS device 411 .
  • the above description is a method of configuring a TVWS communication system based on the first embodiment described above with reference to FIG. 1, but the scope of the present invention is not limited to the above description. That is, the second and third embodiments described above can also be applied to the communication system shown in FIG. 4.
  • the coverage limit of the fixed master TVWS device 401 may be 10 km. Therefore, when the cruise ship 421 including the fixed slave TVWS device 411 is out of the coverage, the fixed slave TVWS device 411 may not be able to perform TVWS communication with the fixed master TVWS device 401. However, in this case, the fixed slave TVWS device 411 transmits the location information of the fixed slave TVWS device 411 to the other fixed master TVWS device 491, and based on this, TVWS communication with the other fixed master TVWS device 491 Can be done. That is, when the fixed slave TVWS device 411 is out of the coverage of the fixed master TVWS device 401, the fixed slave TVWS device 491 may perform handover to the other fixed master TVWS device 491. A more specific handover method of the fixed slave TVWS device 411 will be described later with reference to FIG. 7.
  • the TVWS communication system may include a PTT server 441 for providing a push-to-talk (PTT) service.
  • PTT push-to-talk
  • the PTT server 411 may be connected to the fixed master TVWS device 401 through a TCP/IP network.
  • the fixed slave TVWS device 411 may perform PTT communication with a plurality of terminals 481, 482, 483 in which a PTT client application is installed.
  • the PTT server 441 and the plurality of terminals 481, 482, 483 on which the PTT client application is installed may be used to utilize the plurality of terminals 481, 482, 483 like a radio.
  • the TVWS communication system may include a virtual private network (VPN) server 461 and a cruise ship control monitor 471 connected to the VPN server 461 to monitor the cruise ship 421.
  • the TVWS communication system may include a network management system (NMS) server 451.
  • NMS network management system
  • FIG. 5 is a diagram illustrating a configuration of a communication system when a TVWS communication system is applied to a moving train according to an embodiment of the present invention.
  • the operation of the TVWS communication system shown in FIG. 5 and a description of the operation are the same as or similar to the operation of the TVWS communication system described in the description of FIG. 4. Accordingly, the description of the TVWS communication system shown in FIG. 5 is replaced with the description of FIG. 4.
  • FIG. 6 is a diagram showing the configuration of a fixed TVWS device including a single TVWS modem according to an embodiment of the present invention. According to an embodiment, the TVWS device configuration illustrated in FIG. 6 may be applied to the fixed master TVWS device described above.
  • the fixed TVWS device 600 includes a GPS receiver 610, a WiFi module 620, a CPU 630, a TVWS modem 640, a radio frequency (RF) transceiver 650, and a sensor interface 660. ) Can be included.
  • the GPS receiver 610 may receive a GPS signal through a GPS antenna disposed on the fixed TVWS device 600.
  • the Wi-Fi module 620 may transmit or receive a Wi-Fi signal through a Wi-Fi antenna disposed on the fixed TVWS device 600.
  • the sensor interface 660 may receive and control information sensed through at least one sensor disposed on the fixed TVWS device 600.
  • the RF transceiver 650 may transmit or receive an RF signal through at least one TVWS antenna disposed in the fixed TVWS device 600.
  • the TVWS modem 640 may be connected to the RF transceiver 650 to convert a characteristic (eg, frequency) of an RF signal transmitted or received.
  • the CPU 630 may be connected to the GPS receiver 610, the WiFi module 620, the TVWS modem 640, and the sensor interface 660. According to various embodiments, the CPU 630 may receive and process various pieces of information from the GPS receiver 610, the WiFi module 620, the TVWS modem 640, and the sensor interface 660. For example, the CPU 630 may determine location information of the fixed TVWS device 600 based on the GPS information received from the GPS receiver 610 and transmit the determined location information through the TVWS modem 640.
  • the configuration diagram of the TVWS device shown in FIG. 6 is a device configuration according to an embodiment of the present invention. Therefore, the scope of the present invention should not be limited to the configuration of the TVWS device shown in FIG. 6.
  • FIG. 7 is a diagram showing the configuration of a fixed TVWS device including a dual TVWS modem according to an embodiment of the present invention.
  • the configuration of the TVWS device shown in FIG. 7 can be applied to the fixed slave TVWS device described above.
  • the fixed TVWS device 700 includes a GPS receiver 710, a WiFi module 720, a CPU 730, a first TVWS modem 740, a first RF transceiver 750, and a second TVWS modem. 760, a second RF transceiver 770, and may include a sensor interface 780.
  • the GPS receiver 710 may receive a GPS signal through a GPS antenna disposed on the fixed TVWS device 700.
  • the Wi-Fi module 720 may transmit or receive a Wi-Fi signal through a Wi-Fi antenna disposed on the fixed TVWS device 700.
  • the sensor interface 780 may receive and control information detected through at least one sensor disposed on the fixed TVWS device 700.
  • the first RF transceiver 750 and the second RF transceiver 770 may transmit or receive RF signals through at least one TVWS antenna disposed in the fixed TVWS device 700.
  • the first TVWS modem 740 and the second TVWS modem 760 are connected to the first RF transceiver 750 and the second RF transceiver 770, and the characteristics of RF signals transmitted or received (eg For example, frequency) can be converted.
  • the fixed TVWS device 700 may determine whether to handover using a dual TVWS modem based on a received signal strength indicator (RSSI) according to a scanning method.
  • the first TVWS modem 740 may determine an RSSI corresponding to the first fixed master TVWS device by scanning a signal (eg, a reference signal or a beam) transmitted from the first fixed master TVWS device.
  • the second TVWS modem 760 may determine an RSSI corresponding to the second fixed master TVWS device by scanning a signal transmitted from the second fixed master TVWS device.
  • the CPU 730 may determine whether to handover based on an RSSI corresponding to each fixed master TVWS. For example, when the fixed TVWS device 700 is connected to the first fixed master TVWS device, and the RSSI corresponding to the first fixed master TVWS device is smaller than the RSSI corresponding to the second fixed master TVWS device, the CPU ( 730 may determine to perform handover to the second fixed master TVWS device.
  • the fixed TVWS device 700 may receive location information related to handover from the TVWS server, and location information determined based on GPS information received through the GPS receiver 710 and the TVWS server Whether to handover may be determined based on the received location information related to the handover. For example, if the location information of the TVWS device determined based on the received GPS information corresponds to location information requiring handover, the fixed TVWS device 700 may determine to perform handover.
  • the fixed TVWS device 700 when the coverage of the fixed master TVWS device connected to the fixed TVWS device 700 and TVWS communication is greater than or equal to a specific threshold, the fixed TVWS device 700 performs a handover based on RSSI according to the scanning method described above. You can decide whether or not.
  • the fixed TVWS device 700 and the fixed slave TVWS device to which TVWS communication is connected are less than the specific threshold, as described above, the fixed TVWS device 700 is Handover may be determined based on location information related to over.
  • the CPU 730 may be connected to the GPS receiver 710, the WiFi module 720, the first TVWS modem 740, the second TVWS modem 760, and the sensor interface 780. According to various embodiments, the CPU 730 receives various information from the GPS receiver 710, the WiFi module 720, the first TVWS modem 740, the second TVWS modem 760, and the sensor interface 780, and You can handle this. For example, the CPU 730 may determine location information of the fixed TVWS device 700 based on GPS information received from the GPS receiver 710 and determine whether to handover based on the determined location information.
  • 8A and 8B are a configuration and operation scheme of a TVWS communication system according to a fourth embodiment of the present invention.
  • the fixed master TVWS device 801 may be fixed at a specific location (e), and the fixed slave TVWS device 811 may move along a specific path.
  • the movement path of the fixed slave TVWS device 811 is made into a square, and the position (a, b, c, d) of each vertex of the square and the position where the fixed master TVWS device 801 is arranged (e ) Can be used as TVWS transmission/reception channels.
  • the position of the vertex a of the rectangle may be determined based on the coordinates in the left direction and the coordinates in the lower direction of the moving path of the fixed slave TVWS device 811, and the position of the vertex b of the rectangle is moved by the fixed slave TVWS device 811 It may be determined based on the right direction coordinates and the lower direction coordinates of the path, and the position of the c vertex of the rectangle may be determined based on the right direction coordinates and the upper direction coordinates of the moving path of the fixed slave TVWS device 811, and the d vertex of the rectangle The location may be determined based on the coordinates in the left direction and the coordinates in the upper direction of the movement path of the fixed slave TVWS device 811.
  • the corner positions of the square formed by the movement of the fixed slave TVWS device 811 (a, If b, c, d) and the location (e) of the fixed master TVWS device are the same, the TVWS transmission/reception channels used may be the same.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Multimedia (AREA)
  • Two-Way Televisions, Distribution Of Moving Picture Or The Like (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

La présente invention concerne un système de communication TVWS comprenant : un serveur TVWS qui attribue un canal TVWS disponible sur la base d'informations d'emplacement concernant un dispositif TVWS maître fixe et d'informations d'emplacement concernant un dispositif TVWS esclave fixe ; le dispositif TVWS maître fixe qui est fixé et installé à un emplacement spécifique et reçoit un canal TVWS disponible provenant du serveur TVWS pour déterminer un canal d'émission et de réception TVWS ; et le dispositif TVWS esclave fixe qui est installé dans un corps mobile, transmet les informations d'emplacement au dispositif TVWS maître fixe, et reçoit le canal d'émission et de réception TVWS utilisé pour une communication à partir du dispositif TVWS maître fixe.
PCT/KR2020/011182 2019-08-22 2020-08-21 Système de communication fournissant une communication de données par l'intermédiaire d'une bande d'espace blanc de télévision (tvws) WO2021034147A1 (fr)

Applications Claiming Priority (2)

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KR10-2019-0103106 2019-08-22
KR1020190103106A KR102105693B1 (ko) 2019-08-22 2019-08-22 TVWS(television white space) 대역을 통해 데이터 통신을 제공하는 통신 시스템

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WO2021034147A1 true WO2021034147A1 (fr) 2021-02-25

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KR102598037B1 (ko) * 2022-04-06 2023-11-03 이노넷 주식회사 Gps 수신이 안되는 실내 및 지하터널에서 사용하기 위한 tvws를 이용한 무선 백홀 시스템

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20110116458A1 (en) * 2009-11-17 2011-05-19 Samsung Electronics Co., Ltd. Method and system for selective scalable channel-based station enablement and de-enablement in television band white spaces
KR20180066341A (ko) * 2016-12-08 2018-06-19 조선대학교산학협력단 다중대역 안테나를 활용한 다기능 무선 시시티브이 장치
KR20180123357A (ko) * 2017-05-08 2018-11-16 이노넷 주식회사 카메라와 이동통신 기지국 서비스가 가능한 vhf 및 uhf 무선백홀 기반의 드론을 이용한 실종자 수색 시스템
KR101920486B1 (ko) * 2018-03-27 2018-11-20 이노넷 주식회사 듀얼 무선 백홀 시스템
KR101937251B1 (ko) * 2018-06-26 2019-01-10 유호상 Tvws를 이용한 영상 감시 시스템

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20110116458A1 (en) * 2009-11-17 2011-05-19 Samsung Electronics Co., Ltd. Method and system for selective scalable channel-based station enablement and de-enablement in television band white spaces
KR20180066341A (ko) * 2016-12-08 2018-06-19 조선대학교산학협력단 다중대역 안테나를 활용한 다기능 무선 시시티브이 장치
KR20180123357A (ko) * 2017-05-08 2018-11-16 이노넷 주식회사 카메라와 이동통신 기지국 서비스가 가능한 vhf 및 uhf 무선백홀 기반의 드론을 이용한 실종자 수색 시스템
KR101920486B1 (ko) * 2018-03-27 2018-11-20 이노넷 주식회사 듀얼 무선 백홀 시스템
KR101937251B1 (ko) * 2018-06-26 2019-01-10 유호상 Tvws를 이용한 영상 감시 시스템

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