KR20110003986A - Uav communication system by using heterogeneous mobile communication system - Google Patents

Uav communication system by using heterogeneous mobile communication system Download PDF

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Publication number
KR20110003986A
KR20110003986A KR1020090061551A KR20090061551A KR20110003986A KR 20110003986 A KR20110003986 A KR 20110003986A KR 1020090061551 A KR1020090061551 A KR 1020090061551A KR 20090061551 A KR20090061551 A KR 20090061551A KR 20110003986 A KR20110003986 A KR 20110003986A
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KR
South Korea
Prior art keywords
unmanned aerial
aerial vehicle
communication system
mobile communication
data
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KR1020090061551A
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Korean (ko)
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고경완
이석신
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고경완
이석신
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Priority to KR1020090061551A priority Critical patent/KR20110003986A/en
Publication of KR20110003986A publication Critical patent/KR20110003986A/en

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/10—Connection setup
    • H04W76/15—Setup of multiple wireless link connections
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W84/00—Network topologies
    • H04W84/02—Hierarchically pre-organised networks, e.g. paging networks, cellular networks, WLAN [Wireless Local Area Network] or WLL [Wireless Local Loop]
    • H04W84/04—Large scale networks; Deep hierarchical networks
    • H04W84/042—Public Land Mobile systems, e.g. cellular systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
    • H04W88/02—Terminal devices
    • H04W88/06—Terminal devices adapted for operation in multiple networks or having at least two operational modes, e.g. multi-mode terminals
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W92/00—Interfaces specially adapted for wireless communication networks
    • H04W92/02—Inter-networking arrangements

Abstract

The present invention relates to an unmanned aerial vehicle communication system using a heterogeneous mobile communication system. The unmanned aerial vehicle communication system must meet the following conditions when using a commercially available mobile communication system. First, wide coverage. Second, large capacity communication system. Third, the network traffic problem should be solved. In order to solve the problems raised above, a communication system using a heterogeneous mobile communication network is constructed, which means WiBro of OFDM series and HSPA or LTE of WCDMA series. The system configuration uses a plurality of heterogeneous mobile communication networks to form independent communication channels in parallel. Using such a communication channel, it is possible to secure coverage of the HSPA communication network, to implement a large-capacity communication system through a plurality of parallel communication channels, to independently generate traffic through heterogeneous networks, and to solve network failures accordingly.

Description

Unmanned aerial vehicle based communication system using heterogeneous mobile communication system {UAV communication system by using heterogeneous mobile communication system}

The present invention relates to a communication system for mounting an unmanned aerial vehicle, and implements the communication system as an unmanned aerial vehicle communication system by establishing parallel communication channels independent of each other using heterogeneous mobile communication networks. More specifically, the heterogeneous mobile communication networks mean OFDM-based WiBro and WiBro Evolution, WCDMA-based HSPA, HSPA + and LTE.

[Reference 1] Danyu Zhu, Matt W. Mutka, Zhiwei Cen, "Using Cooperative Multiple Paths to Reduce File Download Latency in Cellular Data Networks", Proc IEEE Globecom 2005, pp2480-2484

The unmanned aerial vehicle communication system should ensure wide coverage based on the operating radius of the unmanned aerial vehicle, secure large data transmission for unmanned aerial vehicle for surveillance reconnaissance, and ensure stable communication environment for network traffic. However, when using the unmanned aerial vehicle communication system using only one commercial mobile communication network, the following problems occur.

First, the unmanned aerial vehicle communication system should have a wide transmitable area. However, when looking at commercially available mobile communication networks, communication transmission areas of WiBro or High Speed Uplink Packet Access (HSUPA) except for High Speed Downlink Packet Access (HSDPA) exist as partial transmission areas, not the entire Korean peninsula. Therefore, other mobile communication systems except HSDPA are not suitable as unmanned aerial vehicle communication systems. In addition, since the mobile communication network has a shadow area and communication in the shadow area is impossible, there is an area where communication is impossible when only one communication network is used. In addition, although the transmittable area may change according to the altitude, this can be solved to maintain the transmittable area of the ground by using an array antenna when the transmittable area of the ground is secured. Therefore, focusing on the transmittable area of the ground to solve the problem of undeliverable area.

Second, the mobile communication system has a bottleneck phenomenon in which the transmission performance cannot process all the information transmission for transmitting a large amount of information such as a high-definition image for surveillance and reconnaissance drone. Therefore, mobile communication systems are not suitable for use in surveillance reconnaissance drones. In addition, since mobile communication is a communication system designed on a ground basis, an array antenna is mounted on an unmanned aerial vehicle to solve a problem in an area where transmission is impossible due to altitude. At this time, a noticeable decrease in the transmission speed will appear. This means that the bottleneck raised above becomes more severe. Therefore, it is very difficult to use the most commonly used surveillance reconnaissance drone, and thus the use of a mobile communication system as a communication system for an unmanned aerial vehicle is limited.

Third, in the case of using a commercial mobile communication network, unpredictable network traffic is generated according to other users using the commercial mobile communication network, which causes a deterioration of the stability of the communication system. The unmanned aerial vehicle is a vehicle having a high speed mobile environment, and therefore, a stable monitoring device is required. When implementing a communication system using a mobile communication network, stability should be considered.

When the mobile communication system is used as an unmanned aerial vehicle communication system, three problems as described above occur. In order to solve this problem, a heterogeneous mobile communication network has a parallel communication channel having a structure as shown in FIG. 1. The problem-solving process according to the communication channel is as follows.

First, in the case of a wide transmittable area, since the communication channels of the proposed system are independent of each other, each communication network has a different transmittable area. In addition, a communication system taking the form of parallel transmission and reception takes several parallel communication channels, and if more than one communication network operates, the communication system using the communication network can operate, and the transmission area of the communication system is It will include the coverage area of each network. Therefore, a communication system forming an independent parallel communication network has a transmittable area including all different transmittable areas independently. Among them, the transmission region of the HSDPA, which is one of the communication networks constituting the communication system, is throughout the country, and thus the transmission region of the proposed communication system is throughout the country. Therefore, the proposed communication system can secure a wide transmission area for solving the first problem raised above.

Second, in the case of large transmission capacity, the proposed system takes the form of parallel transmission and reception. Therefore, when transmitting data through a plurality of communication networks connected in parallel per unit time, it is possible to transmit and receive a plurality of information through a plurality of communication networks than a system that transmits only one communication unit per unit time, the proposed communication system Has a large transmission capacity.

Third, the proposed communication system has a form of parallel transmission and reception using communication networks independent from each other. In addition, each communication network constituting such a communication system has independent network traffic in the case of heterogeneous communication networks. Therefore, the traffic of the communication system is degraded when the traffic occurs in the mobile communication network when using one mobile communication network. However, when a communication system is constructed using heterogeneous mobile communication networks, when traffic is generated in one communication network constituting the communication system and a temporary deterioration in communication performance occurs, there is a probability that the traffic does not occur in other communication networks forming the communication system. As a result, the performance degradation of the entire system is relatively small and network traffic is distributed. The stability of the unmanned aerial vehicle system can be obtained through the distribution effect of network traffic.

A similar study to this patent has been a study on reducing file download time using cooperative multipathing in cellular data networks [1]. Although the overall structure is similar to the flow of data from the unmanned aerial vehicle to the ground control center, the system proposed in this patent uses a heterogeneous mobile communication network to secure wide coverage based on the operating radius of the unmanned aerial vehicle, network traffic compared to the above studies. It is excellent in ensuring stable communication environment.

Preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the following description, only parts necessary for understanding the operation according to the embodiment of the present invention will be described, it should be noted that the description of other parts will be omitted so as not to distract from the gist of the present invention.

1 is a schematic diagram of a communication system for an unmanned aerial vehicle to which the present invention is applied.

As shown in FIG. 1, in the communication system to which the present invention is applied, when the communication system between the unmanned aerial vehicle 100 and the ground control center 101 is configured, a parallel communication network independent of each other is constructed using heterogeneous mobile communication networks. There is a characteristic. Commercial mobile communication networks for constructing communication networks include third generation mobile communication networks such as HSPA 102 and Wibro wave 2 103 and fourth generation mobile communication networks such as WiBro Evolution 104 and LTE 105.

2A is a block diagram of a communication system for an unmanned aerial vehicle to which the present invention is applied, and is a communication system configured among the unmanned aerial vehicle.

As shown in Fig. 2A, the apparatus of the present invention for achieving the above object is a device in an unmanned aerial vehicle in an apparatus for transmitting data in parallel. Such a device receives data from an external data input unit 200, receives data from the data input unit, divides the data, packetizes a header according to the type of the divided data, and transmits the packet to a packet to request retransmission indicated by the communication network manager. Packetization in the data segmentation and packetization section 201, and data segmentation and packetization section for applying packetized data and packets re-transmitted at the terrestrial control center to the commercial mobile communication network matching section. Mobile network matching unit which receives the received data and transmits it using the matched commercial mobile network modem or receives information on the unmanned aerial vehicle control message, packet retransmission request, and the status of commercial mobile communication network from the ground control center and transmits it to the synthesis unit. 202, 203, 204, and 205), the information received from the matching unit for commercial mobile communication network It classifies whether it is network information, unmanned aerial vehicle control data, or packet retransmission request. Subsequently, the network information and the packet retransmission request are applied to the communication network management unit, synthesized in the case of control data and applied to the data output unit, and a synthesis unit 206 for requesting retransmission to the communication network management unit when packet loss is found during synthesis of the control data. . The network status table is updated through network information on the commercial mobile communication network received from the synthesis unit, and the network management unit 207 for notifying the updated state table and the retransmitted packet to the data division and packetization unit, and the synthesized data received from the synthesis unit There is a data output section 208 for outputting.

2B is a block diagram of a communication system for an unmanned aerial vehicle to which the present invention is applied, and is a communication system configured in the ground control center.

The device in the ground control center informs the network management section of the Internet transceiver 209 that can transmit and receive via the Internet wired network connected through the Ethernet controller, and the network management to receive the packet received through the Internet transceiver and arranges it according to the order information in the header of the packet. Later, the buffer unit 210 applies the stored packet and the packet in the case of the retransmission request to the synthesizer, observes the communication network according to the presence or absence of the information received through the buffer unit, and makes a state table. The control center authorizes the Internet transceiver to send the packet to the synthesizer of the unmanned aerial vehicle, or informs the replica of the packet to be retransmitted when a retransmission request is made, and duplicates the missing packet received from the unmanned aerial vehicle. The network management unit 211 informing the unit sends header information to the sorted packets received from the buffer unit. Delete and synthesize the data in order to make it into integrated data form obtained from the unmanned aerial vehicle, apply it to the data output unit, or request retransmission to the network management unit if a packet is found missing during synthesis, and if the retransmission request from the unmanned aerial vehicle The synthesizer 212 delivers the information on the retransmission request packet to the management unit, the data output unit 213 for outputting the synthesized data received from the synthesizer, the data input unit 214 for receiving control information of the unmanned aerial vehicle, and the input unit. According to the communication network status table of the communication network management unit, the usable communication network is characterized in that there is a replica unit 215 for transmitting the packet with the same data to the Internet transceiver or a retransmission request.

Next, the operation of the communication system for an unmanned aerial vehicle will be described in detail with reference to FIGS. 3A to 4B.

Figure 3a is a flow chart of the unmanned aerial vehicle during the process of transmitting from the unmanned aerial vehicle to the ground control center of the parallel transmission method of data using a heterogeneous network according to the present invention.

First, the data input unit receives data to be transmitted from the unmanned aerial vehicle to the ground control center (300).

Thereafter, the network management unit checks the connection state of the current communication network, updates the communication state table, and selects a mobile communication network matching unit to transmit. This means that the unmanned aerial vehicle checks the connection status of the communication network. The selection of matching units to transmit can be multiple. In addition, if a request for retransmission is requested, the data division and packetization unit is requested for retransmission thereof (301).

Then, it is determined whether the data to be transmitted by the data division and packetizer is streaming video data. The retransmission packet is regarded as not data in the streaming form (302).

After that, in the case of streaming data in the data segmentation and packetization unit, only the packet order is attached to the header since the data is real-time emphasized and retransmission is not necessary when data is lost on the transmission path. In addition, during packetization, the data is divided by the number of modems selected from the network management unit and packetized after the header (303).

Or, if the data is not in the form of streaming, such as stored high-definition video or unmanned aerial vehicle status information, etc. This information is more important than the real-time stability of the information transmission is important information, so it is necessary to retransmit when data lost on the transmission path. Therefore, the size of the total data to be transmitted is added to the header in addition to the packet order so that data loss can be known. In addition, when packetizing data, the data is divided by the number of modems selected by the network management unit and packetized after the header. In addition, the retransmission packet is obtained from the network management unit to obtain information on the packet to be retransmitted to generate a retransmission packet (304).

Thereafter, the commercial mobile communication network matching unit applies the packetized data to each commercial mobile communication network. At the time of authorization, the communication network manager approves each of the selected modems (305).

Thereafter, the authorized data is transmitted to the ground control center. In addition, the commercial mobile communication network refers to third generation mobile communication networks such as HSPA and Wibrowave2, and fourth generation mobile communication networks such as WiBro Evolution and LTE (306).

Figure 3b is a flow chart in the ground control center during the process of transmitting from the unmanned aerial vehicle to the ground control center of the parallel transmission method of data using a heterogeneous network according to the present invention.

First, the packet transmitted through the commercial mobile communication network matching unit from the unmanned aerial vehicle to the Internet through the Internet transceiver is applied to the buffer unit and stored in the buffer (307).

Thereafter, the buffer unit sorts the received packets according to the order information in the packet header and transmits them to the synthesizer, and applies the IP address of the mobile communication network where the received packet is sent to the communication network management unit (308).

After that, the network management unit checks the IP of the transmitted location with respect to the received packet and notifies the unmanned aerial vehicle side modem matching unit that the data transmitted from the unmanned aerial vehicle has been received by the ground control center. In addition, a state table of the available mobile communication network is made through the received packet and sent to the replica unit (309).

Thereafter, the synthesis unit checks the header of the packet received from the buffer unit to determine whether the data type requires retransmission (310).

Here, in case of data requiring retransmission, it is checked whether there is a missing packet (311).

Only when there is no missing packet when retransmission is necessary or when retransmission is not required, data arranged in the buffer is synthesized in order (312).

If retransmission is required and there is a missing packet, the network management unit requests retransmission for the packet (313).

Figure 4a is a flow chart in the ground control center during the process of transmitting to the unmanned aerial vehicle from the ground control center of the parallel transmission method of data using a heterogeneous network according to the present invention.

First, the data input unit receives data to be transmitted to the unmanned aerial vehicle from the ground control center (400).

Thereafter, the communication network manager checks the connection status of the current communication network, updates the communication status table, and selects an Internet transceiver to transmit. This means that the unmanned aerial vehicle checks the connection status of the communication network. Selection of the Internet transceiver to be transmitted may be a plurality of Internet transceivers. In addition, when a request for retransmission is requested, the replica unit requests a retransmission thereof (401).

Thereafter, the copying unit also packetizes the header with the header including the packet order and data size before the data. After packetization, data is generated by copying as many times as the number of Internet transceivers that can be transmitted based on the communication status table obtained from the network management unit. In addition, the retransmission packet is generated from the unmanned aerial vehicle by obtaining information on the packet to be retransmitted from the network management unit (402).

Thereafter, the packet generated by the copy unit is applied to the connectable Internet transceiver unit (403).

Thereafter, the data applied to each Internet transceiver is transmitted to the mobile communication network matching unit of the unmanned aerial vehicle to which the Internet transceiver is connected (404).

Figure 4b is a flow chart of the unmanned aerial vehicle during the process of transmitting to the unmanned aerial vehicle from the ground control center of the parallel transmission method of data using a heterogeneous network according to the present invention.

First, through the mobile communication network matching unit, the ground control center applies the information received from the matching unit of the unmanned aerial vehicle to the synthesis unit (405).

Thereafter, the synthesizer determines whether the received data is acknowledgment data for data transmitted from the unmanned aerial vehicle (406).

Thereafter, in case of acknowledgment data, the communication network management unit is notified of the reception (407).

Thereafter, the network manager updates the network state table through the acknowledgment data (408).

Thereafter, when the acknowledgment data is not transmitted from the ground control center to the unmanned aerial vehicle, the information is copied and sent to the unmanned aerial vehicle to check whether the information matches the existing information through the header of the packet (409).

Thereafter, if the existing information does not match, the received packet is sorted according to the order information in the header (410).

Then, it is checked whether there is a missing packet among the received and sorted information (411).

Thereafter, if there is a missing packet, the network management unit requests retransmission for the packet (412).

Then, when there is no missing packet, the sorted data is synthesized in order (413).

1 is a schematic illustration of a communication system for an unmanned aerial vehicle to which the present invention is applied

Figure 2a is an embodiment configuration example of an unmanned aerial vehicle communication system configured in the unmanned aerial vehicle according to the present invention

Figure 2b is an exemplary configuration example of an unmanned aerial vehicle communication system configured in the ground control center according to the present invention

Figure 3a is an embodiment flow diagram for the process of transmitting from the unmanned aerial vehicle configured in the unmanned aerial vehicle to the ground control center according to the present invention

Figure 3b is an embodiment flow diagram for the process of transmitting from the unmanned aerial vehicle configured in the ground control center to the ground control center according to the present invention

Figure 4a is an embodiment flow diagram for the process of transmitting to the unmanned aerial vehicle from the ground control center configured in the ground control center according to the present invention

Figure 4b is a flow chart of one embodiment for the process of transmitting to the unmanned aerial vehicle from the ground control center configured in the unmanned aerial vehicle according to the present invention

Claims (3)

In constructing a communication system under an unmanned aerial vehicle environment, By using two or more commercial mobile communication networks (102, 103, 104, 105) with different transmission methods, a communication channel is constructed in parallel between the unmanned aerial vehicle 100 and the ground control center 101 and a parallel transmission / reception communication system for an unmanned aerial vehicle is used. Way The method of claim 1, The commercial mobile communication network is a third generation mobile communication network such as HSPA (102), Wibrowave 2 (103) and a third generation mobile communication network such as WiBro Evolution (104), LTE 105, etc. Transmitting / receiving system configuration, characterized in that communication channels of heterogeneous network and same network can be configured in parallel using communication network The system of claim 1, wherein the parallel transceiving communication system for the unmanned aerial vehicle is a commercially available commercial vehicle mounted on the unmanned aerial vehicle after dividing the data to be transmitted by the data division and packetizing unit 201 when transmitting from the unmanned aerial vehicle to the ground control center. A method of individually assigning and transmitting the matching units 202, 203, 204, and 205 of the mobile communication network; On the contrary, when transmitting from the ground control center to the unmanned aerial vehicle, the data to be transmitted is duplicated in the copy unit 215 of the ground control center, and then allocated to the communicable internet transceiver 209 mounted in the ground control center and transmitted. Way
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KR101244699B1 (en) * 2011-09-14 2013-03-19 국방과학연구소 Data transmitting apparatus of flight system and method thereof
CN104581783A (en) * 2014-12-30 2015-04-29 融智通科技（北京）股份有限公司 Communication method for unmanned aerial vehicle
CN105070017A (en) * 2015-08-13 2015-11-18 杭州若联科技有限公司 Wireless communication method and system for unmanned aerial vehicle
KR20160128144A (en) 2015-04-28 2016-11-07 주식회사 유브이코어 Air traffic Control System for Small Size UAV using Commercial Cellular Networks
WO2017019595A1 (en) * 2015-07-27 2017-02-02 Genghiscomm Holdings, LLC Airborne relays in cooperative-mimo systems
KR20170089582A (en) * 2016-01-27 2017-08-04 한국전자통신연구원 Methods and Procedures for Dynamic Channel Assignment and Change in UAS Control and Non-Payload Communication
CN109326110A (en) * 2018-10-18 2019-02-12 朱泉昊 Unmanned aerial vehicle (UAV) control device, unmanned plane, UAV system and control method
WO2019045465A1 (en) * 2017-08-30 2019-03-07 주식회사 호그린에어 Communication system of unmanned aerial vehicle
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KR101244699B1 (en) * 2011-09-14 2013-03-19 국방과학연구소 Data transmitting apparatus of flight system and method thereof
CN104581783A (en) * 2014-12-30 2015-04-29 融智通科技（北京）股份有限公司 Communication method for unmanned aerial vehicle
KR20160128144A (en) 2015-04-28 2016-11-07 주식회사 유브이코어 Air traffic Control System for Small Size UAV using Commercial Cellular Networks
US10866596B1 (en) 2015-07-27 2020-12-15 Genghiscomm Holdings, LLC Airborne relays in cooperative-MIMO systems
WO2017019595A1 (en) * 2015-07-27 2017-02-02 Genghiscomm Holdings, LLC Airborne relays in cooperative-mimo systems
CN108349589A (en) * 2015-07-27 2018-07-31 珍吉斯科姆控股有限责任公司 Airborne relaying in cooperation MIMO system
US11586227B2 (en) 2015-07-27 2023-02-21 Tybalt, Llc Airborne relays in cooperative-MIMO systems
US10444766B2 (en) 2015-07-27 2019-10-15 Genghiscomm Holdings, LLC Airborne relays in cooperative-MIMO systems
US10514709B2 (en) 2015-07-27 2019-12-24 Genghiscomm Holdings, LLC Airborne relays in cooperative-MIMO systems
CN105070017A (en) * 2015-08-13 2015-11-18 杭州若联科技有限公司 Wireless communication method and system for unmanned aerial vehicle
KR20170089582A (en) * 2016-01-27 2017-08-04 한국전자통신연구원 Methods and Procedures for Dynamic Channel Assignment and Change in UAS Control and Non-Payload Communication
WO2019045465A1 (en) * 2017-08-30 2019-03-07 주식회사 호그린에어 Communication system of unmanned aerial vehicle
CN109326110B (en) * 2018-10-18 2020-05-22 朱泉昊 Unmanned aerial vehicle control device, unmanned aerial vehicle system and control method
CN109326110A (en) * 2018-10-18 2019-02-12 朱泉昊 Unmanned aerial vehicle (UAV) control device, unmanned plane, UAV system and control method
KR102144231B1 (en) * 2019-11-18 2020-08-12 에이미파이(주) Method for transmitting video pictures being captured by a drone through cellular networks in real time and apparatus for said method
KR20220167055A (en) * 2021-06-11 2022-12-20 한국항공우주연구원 Compound surveillance system including vehicles with sensors

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