KR101996615B1 - Advanced Dynamic Time Division Multiple Access system and method of operating a network - Google Patents

Advanced Dynamic Time Division Multiple Access system and method of operating a network Download PDF

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KR101996615B1
KR101996615B1 KR1020180162397A KR20180162397A KR101996615B1 KR 101996615 B1 KR101996615 B1 KR 101996615B1 KR 1020180162397 A KR1020180162397 A KR 1020180162397A KR 20180162397 A KR20180162397 A KR 20180162397A KR 101996615 B1 KR101996615 B1 KR 101996615B1
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node
slave
master
slot
master node
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Korean (ko)
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최효기
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한화시스템 주식회사
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    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04JMULTIPLEX COMMUNICATION
    • H04J3/00Time-division multiplex systems
    • H04J3/02Details
    • H04J3/06Synchronising arrangements
    • H04J3/0635Clock or time synchronisation in a network
    • H04J3/0638Clock or time synchronisation among nodes; Internode synchronisation
    • H04J3/0641Change of the master or reference, e.g. take-over or failure of the master
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04JMULTIPLEX COMMUNICATION
    • H04J3/00Time-division multiplex systems
    • H04J3/02Details
    • H04J3/06Synchronising arrangements
    • H04J3/0635Clock or time synchronisation in a network
    • H04J3/0638Clock or time synchronisation among nodes; Internode synchronisation
    • H04J3/0652Synchronisation among time division multiple access [TDMA] nodes, e.g. time triggered protocol [TTP]
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04JMULTIPLEX COMMUNICATION
    • H04J3/00Time-division multiplex systems
    • H04J3/16Time-division multiplex systems in which the time allocation to individual channels within a transmission cycle is variable, e.g. to accommodate varying complexity of signals, to vary number of channels transmitted
    • H04J3/1694Allocation of channels in TDM/TDMA networks, e.g. distributed multiplexers

Abstract

The present invention includes at least one initial master node and a plurality of slave nodes, wherein each of the plurality of slave nodes calculates a separation distance between a plurality of slave nodes, and resets at least one slave node to a master node And a method for operating the network.

Description

[0001] The present invention relates to an advanced dynamic time division multiple access apparatus and a method for operating the same,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an Advanced DTDMA device in which a Dynamic Time Division Multiple Access (DTDMA) evolved from a Time Division Multiple Access (TDMA) And an operation method.

In the TDMA scheme, a plurality of terminals divide the same frequency band into time and communicate so that signals are not duplicated. In the TDMA scheme, a plurality of slave nodes join a ground station to form a TDMA network. At this time, the slots are fixed and can not be changed. Such a TDMA scheme is effective for communication with a terminal moving at a high speed, and can transmit and receive data through a timeslot resistant to Doppler by an allocated time. However, in the TDMA scheme, communication is performed by a predefined transmission / reception slot (time division), and there is a problem that a restriction is imposed on the radio channel environment and the number of nodes participating in the network. Also, if the slave node is disconnected from the ground station, the slave is disconnected from the network or a signal loss occurs.

To improve the TDMA scheme, a DTDMA scheme including a master terminal and a slave terminal and constituting a network has been proposed. In the conventional DTDMA-based communication method, a plurality of slave nodes constitute a network based on a terrestrial master node. Here, the master terminal is a terminal that transmits a synchronization signal, and the slave terminal is a terminal that acquires synchronization through a synchronization signal transmitted from the master terminal and communicates with the master terminal. That is, in the DTDMA communication apparatus, the slave terminal detects the synchronization pattern included in the signal transmitted from the master terminal, enters the network, and can communicate with the master terminal. At this time, the slave terminal synchronizes based on the time information acquired from the master terminal, and transmits / receives data through the time slot set in the master terminal. Therefore, the DTDMA scheme requests the master node to reset the slot, and the slave node automatically joins and leaves the network. As described above, DTDMA is not set in advance, and a DTDMA protocol network can be established by setting various slots dynamically according to the setting of the terrestrial master node. That is, the DTDMA scheme can efficiently transmit data according to the size change of the transmission data by dynamically setting the time slot allocation. Such a DTDMA-based communication scheme can be applied to an existing data-link communication apparatus because it is possible to speed up the initial network establishment time as the initial predetermined slot information input is unnecessary.

Meanwhile, the DTDMA-based communication scheme requests the master node when an event of the slave node occurs, thereby reconfiguring the network. That is, when an event such as a subscription, withdrawal, or size of shared information is generated among a plurality of slave nodes, the master node requests slot allocation adjustment, and the ground master node identifies the current network node status, Lt; / RTI > At this time, the slot reset information is manually input from the master node.

However, the DTDMA communication method has many unnecessary factors such as a network reset time according to a subscriber node and a wireless communication channel environment. That is, a contention slot information is transmitted to reset a subscriber node, and a master node setting, a slave node relay, a content node and a master node reset of a master node, a final re-slot setting, The network reconfiguration proceeds through information exchange among the plurality of nodes. Moreover, it also has a disadvantage that it is difficult to immediately react to such radio channel environment, the number of subscribers, and the like.

Korean Patent No. 10-0926232 Korean Patent No. 10-0966693

The present invention provides an advanced DTDMA apparatus and a network operating method thereof that can quickly and effectively perform node resetting.

The present invention provides an advanced DTDMA device and network operating method thereof, which can speed up node resetting by designating a master node among a plurality of slave nodes when a network is changed.

The ADTDMA apparatus according to an embodiment of the present invention includes at least one initial master node and a plurality of slave nodes and each of the plurality of slave nodes calculates a separation distance according to reception sensitivity between a plurality of slave nodes, Thereby resetting at least one slave node to the master node.

The distance between the slave nodes is calculated by Equation (1).

[Equation 1]

Figure 112018126085252-pat00001

Here, d is the separation distance (km), Tx is the transmission power of the other node, RSSI is the received signal strength, and f is the operating frequency.

If the distance between the slave nodes is less than the set distance and the number of events measured by the slave node is greater than the number of slave nodes, the slave node is reset to the master node.

The initial master node includes a master slot input unit for inputting slot information for setting an initial master node, a first master setting unit for managing slot information and transmitting slot information to a plurality of slave nodes, A first advanced data generator for generating advanced data and transmitting the generated advanced data to a plurality of slave nodes, a first DTDMA controller for controlling transmission and reception related functions by monitoring a time point at which a slot is changed, And a first communication unit for transmitting and receiving data of the first communication unit.

The advanced data of the initial master node includes platform information of the initial master node, location information (PPLI), amount of slot information, modulation / demodulation ratio, data size, node number, communication time slot and network number.

Each of the plurality of slave nodes includes a synchronization acquiring unit for receiving a reference signal received from an initial master node to acquire synchronization, and a synchronization acquiring unit for calculating a separation distance according to reception sensitivities between the plurality of slave nodes to reset a slave node to a master node A second advanced data generator for generating advanced data of the initial master node and transmitting the generated advanced data to a plurality of slave nodes, a second DTDMA control unit for monitoring the time when the slot is changed and controlling the transmission / And a second communication unit for transmitting and receiving data between the initial master node and the plurality of slave nodes.

The second master setting unit calculates the separation distance according to the reception sensitivities of the plurality of slave nodes according to Equation (1), and if the number of events by the slave node measured at a distance equal to or less than the set distance is greater than the number of slave nodes, Set the slave node as the new master node.

The advanced data of the initial master node includes platform information of the initial master node, location information (PPLI), amount of slot information, modulation / demodulation ratio, data size, node number, communication time slot and network number.

In another aspect of the present invention, there is provided a method of operating a network of an ADTMA device, comprising the steps of: a first master node transmitting a reference signal and slot information to a plurality of slave nodes; a plurality of slave nodes inputting reference signals and slot information Acquiring wireless communication synchronization; transmitting and receiving advanced data between an initial master node and a plurality of slave nodes; calculating a separation distance according to reception sensitivity between a plurality of slave nodes, A step of sharing the fact that a slave node which can be set as a master node can be set as a master node when an event occurs, between a plurality of slave nodes, a step of resetting a slave node which can be set as a master node to a master node, The process of reconstructing It should.

The distance between the slave nodes is calculated by Equation (1).

[Equation 1]

Figure 112018126085252-pat00002

Here, d is the separation distance (km), Tx is the transmission power of the other node, RSSI is the received signal strength, and f is the operating frequency.

If the distance between the slave nodes is less than the set distance and the number of events by the measured slave node is greater than the number of slave nodes, the process of identifying the slave node as a master node identifies the slave node as a master node .

The re-established master node resets the slot information based on the advanced data collected from each of the plurality of slave nodes.

The ADTDMA apparatus according to the present invention is a system in which a plurality of slave nodes operate a network based on a terrestrial master node, share advanced data separately from information sharing between slave nodes, and each slave node subscribed to the network receives Continuously measure the separation distance according to sensitivity. If the number of events by the slave node measured at a distance equal to or less than the set distance is greater than the number of slave nodes, the slave node is determined as a new master node.

According to the present invention, a plurality of slave nodes can automatically reconfigure a master node faster than a conventional DTDMA method by automatically designating a master node upon network change taking into consideration the amount of information to be transmitted, the radio channel environment, and the number of nodes. In addition, the network subscription and withdrawal time is faster than the DTDMA method, and effective slot reconfiguration is possible based on advanced data. Therefore, it is possible to operate the network more stably than the existing DTMA system and DTDMA system. In addition, real-time network management enables more efficient multi-net operation.

Meanwhile, the present invention can be applied to a Weapon data link communication device which can improve the tactical data link communication method applied to an air platform and which requires real time network construction and release between a plurality of nodes It is possible.

1 is a schematic diagram of a tactical data link communication network using an advanced DTDMA device in accordance with an embodiment of the present invention;
2 is a configuration diagram of an initial master node and a slave node of an ADTDMA device according to an embodiment of the present invention;
3 is a flowchart illustrating a network operation method using an ADTDMA device according to an embodiment of the present invention.
FIG. 4 is a graph comparing time required for setting an ADTDMA device, a conventional TDMA device, and a DTDMA device according to an embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. It should be understood, however, that the invention is not limited to the disclosed embodiments, but is capable of other various forms of implementation, and that these embodiments are provided so that this disclosure will be thorough and complete, It is provided to let you know completely. In the drawings, the thickness is enlarged to clearly illustrate the various layers and regions, and the same reference numerals denote the same elements in the drawings.

1 is a schematic diagram of a tactical data link communication apparatus using an advanced DTDMA apparatus according to an embodiment of the present invention.

Referring to Figure 1, a tactical data link communication device includes at least one initial master node 10 and a plurality of slave nodes 21, 22, 23, ..., 2n 20, The slave node 20 of the network 20 forms a tactical data link system through the DTDMA network 30. [ Here, the initial master node 10 may be provided on the ground including the ground control center and the base station, and the plurality of slave nodes 20 may be provided in the air including the aircraft. However, the slave node 20 may be provided on the ground including an armored vehicle or the like, and may be provided on the sea including a ship or the like. That is, the present invention can be applied to at least one of a plurality of slave nodes 20, air, ground, and sea, and the embodiment describes a slave node 20 of the public. Meanwhile, the initial master node 10 and the plurality of slave nodes 20 may include terminals for DTDMA communication. That is, the initial master node 10 may include an initial master terminal, and the plurality of slave nodes 20 may include a slave terminal. The master terminal transmits a signal including a synchronization pattern including time information of the master terminal as a terminal for providing a communication service to the slave terminal. The slave terminal can receive the signal of the master terminal, detect the synchronization pattern included in the received signal, and acquire synchronization with the master terminal. The slave terminal can transmit and receive data in the synchronization acquisition state with the master terminal. In the following description, it is to be understood that the master node and the slave node are each provided with a terminal for DTDMA communication, even though the terms master node and slave terminal are not used and the terms master node and slave node are used. Here, one embodiment of the present invention is that an on-the-ground master node 10 is initially set up, and when at least one of a plurality of slave nodes 20 during a tactical data link communication has exceeded a set distance from the master node 10 At least one of the plurality of slave nodes 20 can be reset to the master node. That is, the present invention is initially set up as a terrestrial master node, and at least one of a plurality of slave nodes during a tactical data link communication can be reset to the master node. At this time, the distance from the initial master node 10 for resetting the master node 10 among the plurality of slave nodes 20 may be set to, for example, 300 km. That is, at least one of the plurality of slave nodes 20 can be reset to the master node 10 when at least one slave node 20 moves away from the initial master node 10 by more than 300 km. The DTDMA communication method according to the present invention will be referred to as advanced DTDMA (hereinafter referred to as 'ADTDMA').

2 is a configuration diagram of an ADTDMA apparatus according to an embodiment of the present invention, and is a configuration diagram of an initial master node and a slave node. That is, communication terminals are provided in the initial master node and the slave node provided on the ground for the ADTDMA network configuration according to an embodiment of the present invention. FIG. 2 shows the configuration of the communication terminals of the initial master node and the slave node, Respectively. At this time, the slave nodes are composed of a plurality of slave nodes having the same configuration, and two slave terminals are shown in Fig.

2, the initial master node 10 may include a master slot input unit 110, a master setting unit 120, an advanced data generation unit 130, a DTDMA control unit 140, and a communication unit 150 .

The master slot input unit 110 may be provided to input slot scheduling information for setting the initial master node 10. In order to establish a TDMA network, at least one of a plurality of nodes must be a master node, and slot scheduling information must be input to the master node 10. For this purpose, a master slot input unit 110 may be provided. That is, the master slot input unit 110 inputs the slot scheduling information to the designated initial master node 10. An embodiment of the present invention may include at least one node on the ground, and a ground node may be a master node 10 by inputting slot scheduling information through a master slot input unit 110 to one ground node. On the other hand, information for setting the master node 10 such as slot scheduling information can be inputted by being downloaded to the CPU of the master node through an interface such as Ethernet or the like. Accordingly, the master slot input unit 110 may include an interface for inputting slot scheduling information or the like to the CPU of the master node 10. Meanwhile, the master slot input unit 110 may input slot scheduling information in consideration of the number of nodes and the wireless communication operating radius. That is, the larger the number of nodes, the wider the wireless communication operating radius, the more amount of slot information can be input.

The master setting unit 120 may be provided for setting the master node 10. That is, when the slot scheduling information is inputted through the master slot input unit 110, the master setting unit 120 can set the slot scheduling information to the master node 10. That is, when the slot scheduling information or the like is inputted through the master slot input unit 110, the master setting unit 120 can set the corresponding node as the master node 10 corresponding thereto. When the master node 10 is set as the master node 10, the master setting unit 120 manages slot information allocated to the entire TDMA, and can transmit slot information to the slave node 20. That is, the slot information is managed by the master setting unit 120 of the master node 10, and slot information can be transmitted to the slave node 20.

The advanced data generation unit 130 generates information of the initial master node 10. For example, the advanced data generating unit 130 may generate the platform information (air, ground, and sea) of the initial master node 10, the precise participant location and identification (PPLI), the amount of information, ), A data size, a node number, a communication time slot, and a network number. That is, the advanced data generation unit 130 can generate advanced data such as platform information and position information that have not been generated by the conventional DTDMA method for the ADTDMA network of the present invention. Here, the platform information may include information of a platform installed in the master node 10 in the air, ground, sea, or the like. The PPLI data is received as a result of the GPS or relative navigation process and may include information on the initial master node 10, detailed location, identification information, time quality, and peer identification information. On the other hand, the amount of information and the modulation / demodulation ratio are input from the modem mounted in the initial master node 10, and the node number of the master node 10 can be given in the DTDMA network. In the initial planning of the operational network, for example, if the node number is identified as 10 aerial, 5 ground, and 3 marine, the node number can be assigned to each platform from 1 to 18. For example, the master node 10 may receive the node number 1 and the plurality of slave nodes 20 may receive the node numbers 2 to 18. That is, the advanced data generation unit 130 generates advanced data such as platform information, position information, amount of information, modulation / demodulation ratio, and node number of the initial master node 10 and transmits them to a plurality of slave nodes 20 have. On the other hand, when the master node is not set, the advanced data generator 130 generates data such as platform type, PPLI, data rate, data size and node number, and generates node number, communication time slot and network number do. Here, the communication time slot and network number data can be set reflecting the platform type, PPLI, data rate, and data size of each node. For example, if the data size is large, the communication time slot data can be set large and the node requiring low capacity tactical data processing can be set to a small communication time slot data.

The DTDMA control unit 140 monitors the time when the slot is changed and controls all functions related to transmission and reception. That is, unlike the TDMA in which the slot is fixed, the DTDMA control unit 140 monitors the time when the slot is changed to reset the slot information in the DTDMA. The DTDMA control unit 140 may perform functions such as monitoring the status of the master node and the slave node, suspending RF transmission, generating a reset status message, and the like, for example, when a slot reset is required.

The communication unit 150 transmits the slot information from the master setting unit 120 to the plurality of slave nodes 20 together with the reference time and the like. The communication unit 150 transmits the advanced data generated from the advanced data generation unit 130 of the master node 10 to the plurality of slave nodes 20 and transmits the advanced data and the event information from the plurality of slave nodes 20 Lt; / RTI > The communication unit 150 may set the slot information input to the DTDMA control unit 140 and may control the time interval for transmission and reception. That is, the communication link 150 transmits and receives data between the master node 10 and a plurality of slave nodes 20.

The operation of the initial master node 10 configured as described above will now be described. The initial master node 10 is designated and slot scheduling information is input to the initial master node 10 through the master slot input unit 110. [ For example, the slot scheduling information may be input to the base station provided on the ground via the master slot input unit 110. After the slot scheduling information is input through the master slot input unit 110, the initial master node 10 is set by the master setting unit 120. That is, the terrestrial base station to which the slot scheduling information is input may be set as the initial master node 10. The master setting unit 120 of the initial master node 10 manages TDMA full slot information and transmits slot information to a plurality of initial slave nodes 20. [ The advanced data generated by the advanced data generator 130 may also be transmitted when slot information or the like is transmitted / received between the initial master node 10 and the plurality of initial slave nodes 20. [ That is, the advanced data generation unit 130 generates advanced data such as platform information, position information, amount of information, modulation / demodulation rate, and node number of the initial master node 10 and transmits them to a plurality of slave nodes 20 have. On the other hand, when the master node is not set, the advanced data generator 130 generates data such as platform type, PPLI, data rate, data size and node number, and generates node number, communication time slot and network number do. While the slot information and the advanced data are transmitted and received between the initial master node 10 and the initial slave node 20, the DTDMA control unit 140 may monitor the time when the slot is changed. Also, the DTDMA control unit 140 can reset slot information and control all functions related to transmission and reception. For example, the DTDMA control unit 140 may perform functions such as monitoring status of a master node and a slave node, stopping RF transmission, generating a reset status message, and the like, when a slot reset is required. Data transmission and reception to and from the slave node 20 of the master node 10 may be performed through the communication unit 150. [

Next, the configuration of the slave node 20 will be described with reference to FIG. 2, the slave node 20 may include a synchronization acquiring unit 210, a master setting unit 220, an advanced data generating unit 230, a DTDMA control unit 240, and a communication unit 250 have.

The synchronization acquiring unit 210 receives the reference signal (Preamble) received from the initial master node 10 to acquire synchronization, and controls the transmission time using the slave slot setting information. Here, the reference signal is usually the first slot information of the entire slot, and it is possible to obtain general radio communication synchronization such as frequency and time.

The master setting unit 220 may be provided to set the slave node 20 as a master node. The master setting unit 220 may calculate the distance by node according to the master set distance and the number of nodes, and determine a new master according to the result. That is, the master setting unit 120 calculates the separation distance of the plurality of slave nodes 20. If the number of events by the slave node 20 measured at a distance equal to or less than the set distance is greater than the number of slave nodes, (20) as a new master node. The determination of the master node by the master setting unit 220 may be performed by the following equations (1) and (2). That is, the master setting unit 120 calculates the distance d by node according to Equation (1), and calculates the distance d, the master settling distance Td, and the maximum number of slave nodes Nmax) of the master node.

Figure 112018126085252-pat00003

Where d is the separation distance (km), Tx is the transmit power of the other node, RSSI is the received signal strength, and f is the operating frequency. That is, the separation distance can be calculated by multiplying the transmission power by the received signal strength minus the constant (3 × 10 8 ) and dividing it by the operating frequency.

Figure 112018126085252-pat00004

Here, d is a spacing distance calculated by Equation (1), Td is a spacing distance set in the device operation design, and Nmax is the maximum number of slave nodes set in the device operation design. That is, the master node is determined when the number of events is greater than the maximum number of slave nodes (Nmax) at a distance Td less than the set distance d.

For example, if a master set distance is set to 300 km and the number of events by a plurality of slave nodes measured at a distance of 300 km or less is greater than the number of slave nodes, a new master node can be set. Here, the event of the slave node may include the ADTDMA network join / drop by the master node and the plurality of slave nodes, and the size of the shared information. For example, in the case where the ADTDMA network is composed of one master node 10 and a plurality of slave nodes 20, at least one slave node 20 that is not included in the ADTDMA network joins the corresponding ADTDMA network, It is possible to deviate from the master set distance of at least one slave node 20 and to withdraw from the network. Meanwhile, when the master node 10 is set as the master node, the master setting unit 220 manages slot information allocated to the entire TDMA and can transmit slot information to the slave node 20. That is, slot information is managed by the master setting unit 220 of the master node 10, and slot information can be transmitted to the slave node 20.

The advanced data generation unit 230 generates information of the slave node 20. For example, the advanced data generation unit 230 generates the advanced information of the slave node 20 based on the platform information (air, ground, and sea) of the slave node 20, the precise Participant Location and Identification (PPLI) , Data size, node number, communication time slot, network number, and the like. That is, the advanced data generation unit 230 can generate advanced data such as platform information and location information that have not been generated by the existing DTDMA system for the ADTDMA network of the present invention. Here, the platform information may include information of a platform installed in the slave node 20 in the air, ground, or sea. The PPLI data is received as a result of GPS or relative navigation processing, and may include information on the slave node 20, detailed location, identification information, time quality, and peer identification information. On the other hand, the amount of information and the modulation / demodulation ratio are input from the modem installed in the initial slave node 20, and the node number of the initial slave node 20 can be given in the DTDMA network. That is, the advanced data generation unit 230 generates advanced data such as platform information, location information, amount of information, modulation / demodulation ratio, node number, etc. of the initial slave node 20 and transmits the advanced data to the initial master node 10, To the node (20). On the other hand, when the master node is not set, the advanced data generation unit 230 generates data such as platform type, PPLI, data rate, data size and node number, and generates node number, communication time slot and network number do. Here, the communication time slot and network number data can be set reflecting the platform type, PPLI, data rate, and data size of each node. For example, if the data size is large, the communication time slot data can be set large and the node requiring low capacity tactical data processing can be set to a small communication time slot data.

The DTDMA control unit 240 monitors the time when the slot is changed and controls all functions related to transmission and reception. In other words, unlike the TDMA in which the slot is fixed, the DTDMA controller 240 monitors the time when the slot is changed to reset the slot information in the DTDMA. The DTDMA control unit 240 may perform functions such as monitoring the state of the master node and the slave node, stopping the RF transmission, and generating a reset state message, for example, when a slot reset is required.

The communication unit 250 receives the slot information transmitted from the initial master node 10 along with the reference time and the like. The communication unit 250 transmits the advanced data generated from the advanced data generation unit 230 of the slave node 20 to the master node 10 and the plurality of slave nodes 20 and transmits the advanced data generated by the plurality of slave nodes 20, Can receive advanced data and event information from the server. The communication unit 250 can set the slot information input to the DTDMA control unit 240 and control the time interval for transmission and reception. That is, the communication link 250 transmits and receives data between the slave node 20 and the master node 10 and the plurality of slave nodes 20.

The driving of the slave node 20 configured as described above will now be described. It is possible to acquire radio communication synchronization after inputting the reference signal and slot information from the initial master node 10. That is, the initial slave node 20 inputs the reference signal and slot information from the initial master node 10 through the communication unit 250, and the synchronization acquisition unit 210 receives the reference signal (Preamble) . At this time, it is possible to perform coarse synchronization, which is a primary synchronization process of the DTDMA network, based on the reference signal. Also, it is possible to detect the master slot corresponding to the master node among the nodes constituting the DTDMA network according to the performance of the coarse synchronization. Then, Fine Synchronization, which is a secondary synchronization process of the DTDMA network, can be performed using the master slot. Meanwhile, the initial slave node 20 can transmit and receive information between the initial master node 10 and a plurality of slave nodes 20. At this time, the advanced data generated by the advanced data generating unit 230 can also be transmitted have. That is, the advanced data generation unit 230 generates advanced data such as platform information, position information, amount of information, modulation rate and node number of the initial slave node 10, (20). In other words, advanced data can be transmitted and received between a plurality of slave nodes 20 as well. In addition, the master setting unit 220 continuously measures the separation distance according to the reception sensitivity between the plurality of slave nodes 20 subscribed to the network. If it is identified within a set separation distance and at the same time, it is identified as a number larger than the set number of nodes, it is identified as a master node. For example, if a master set distance is set to 300 km and the number of events by a plurality of slave nodes measured at a distance of 300 km or less is greater than the number of slave nodes, a new master node can be set. In addition, the DTDMA control unit 240 shares information among a plurality of slave nodes 20 when an event such as network joining, leaving, sharing information size among a plurality of slave nodes 20 occurs. In addition, it is shared among the plurality of slave nodes 20 that the slave node 20 that can be set as the master node when the event occurs can be set as the master node 10. Each slave node 20 requests the slave node, which is the first master node to be received first, to perform setting as a master node, and when receiving all setting requests of the connected slave nodes 20, Node, and immediately reconfigures the network by sharing information such as a slot reset. That is, after the slave node is set as the master node, the master setting unit 220 manages the TDMA total allocated slot information and transmits the slot information to the plurality of initial slave nodes 20. [

As described above, the ADTDMA apparatus according to an embodiment of the present invention manages a network by a plurality of slave nodes based on the terrestrial master node. However, unlike the conventional method, it shares advanced data separately from information sharing between slave nodes. In addition, each slave node subscribed to the network continuously measures a separation distance according to reception sensitivity between subscribed slave nodes. A network operation method using the ADTDMA apparatus according to an embodiment of the present invention will be described with reference to FIG.

3 is a flowchart illustrating a network operation method using an ADTDMA device according to an embodiment of the present invention.

Referring to FIG. 3, in step S110, slot scheduling information is input to the initial master node 10 to set an initial master node 10, and the initial master node 10 transmits a reference signal and slot information to a plurality of slaves (S130) of acquiring wireless communication synchronization by inputting a reference signal and slot information from the initial master node 10 (S130), and transmitting the initial master (S140) of transmitting / receiving advanced data between the node 10 and the plurality of slave nodes 20, and continuously measuring the separation distance according to the reception sensitivity between the plurality of slave nodes 20, A step S160 of sharing a possibility that the slave node 20 which can be set as a master node can be set as a master node between a plurality of slave nodes 20 in the event of occurrence of an event S160, And reconfiguring the network (S170). That is, after at least one initial master node 10 and a plurality of slave nodes configure a network through steps S110 to S130, advanced data is transmitted between the initial master node 10 and a plurality of slave nodes 20 And resetting the master node according to the separation distance and the number of identification nodes through steps S150 to S170. A method of operating a network using the ADTDMA device according to an embodiment of the present invention will be described in detail below.

S110: The initial master node 10 is designated and slot scheduling information is input to the initial master node 10 through the master slot input unit 110. [ For example, the slot scheduling information may be input to the base station provided on the ground via the master slot input unit 110. After the slot scheduling information is input through the master slot input unit 110, the initial master node 10 is set by the master setting unit 120. That is, the terrestrial base station to which the slot scheduling information is input may be set as the initial master node 10.

S120: The master setting unit 120 of the initial master node 10 manages TDMA full slot information and transmits slot information to a plurality of initial slave nodes 20.

S130: After inputting the reference signal and slot information from the initial master node 10, wireless communication synchronization can be obtained. That is, the initial slave node 20 inputs the reference signal and slot information from the initial master node 10 through the communication unit 250, and the synchronization acquisition unit 210 receives the reference signal (Preamble) . At this time, it is possible to perform coarse synchronization, which is a primary synchronization process of the DTDMA network, based on the reference signal. Also, it is possible to detect the master slot corresponding to the master node among the nodes constituting the DTDMA network according to the performance of the coarse synchronization. Then, Fine Synchronization, which is a secondary synchronization process of the DTDMA network, can be performed using the master slot.

S140: The initial slave node 20 can transmit and receive information between the initial master node 10 and the plurality of slave nodes 20. At this time, the initial master node 10 and a plurality of slave nodes 20 each transmit advanced data The advanced data generated by the generators 130 and 230 can also be transmitted. That is, the advanced data generation unit 130 of the initial master node and the advanced data generation unit 230 of the slave node 20 generate the platform information, the position information, and the information of the initial master node 10 and the slave node 20, respectively. The master node 10, and the plurality of slave nodes 20, as shown in FIG. In other words, it is possible to transmit and receive advanced data between the master node 10 and the plurality of slave nodes 20, and between the slave nodes 20. The advanced data generation units 130 and 230 generate data such as a platform type, a PPLI, a data rate, a data size, and a node number when the master node is not set. When setting the master node, the advanced data generation units 130 and 230 generate a node number, .

S150: The master setting unit 220 of the slave node 20 continuously measures the separation distance according to the reception sensitivity between the plurality of slave nodes 20 subscribed to the network. If it is identified within a set separation distance and at the same time, it is identified as a number larger than the set number of nodes, it is identified as a master node. For example, if a master set distance is set to 300 km and the number of events by a plurality of slave nodes measured at a distance of 300 km or less is greater than the number of slave nodes, a new master node can be set.

S160: The DTDMA control unit 240 of the slave node 20 shares information among a plurality of slave nodes 20 at the time of occurrence of an event such as network joining, leaving, sharing information size among a plurality of slave nodes 20. [ In addition, it is shared among the plurality of slave nodes 20 that the slave node 20 that can be set as the master node when the event occurs can be set as the master node 10.

S170: Each slave node 20 requests the slave node, which is the first master node to be received first, to perform setting as the master node, and when receiving all the setting requests of the connected slave nodes 20, Is set as a master node, and the network is reconfigured by immediately sharing information such as a slot reset. That is, after the slave node is set as the master node, the master setting unit 220 manages the TDMA total allocated slot information and transmits the slot information to the plurality of initial slave nodes 20. [ Here, the slot reset information is generated based on the advanced data continuously collected at each of the slave nodes 20. For example, when new node subscription is required, slot allocation is redistributed according to the amount of shared information and platform type among existing network subscription nodes. In addition, at the time of leaving an existing node, the information amount of the leaving node is additionally allocated to a node identified as having a large amount of data among existing slave nodes. In addition, when a reset request is made due to an increase in the size of the shared information, an additional slot is set in the node that has requested the reset of the slot of the existing spare slot allocation node.

[Table 1] and FIG. 4 compares the time required for establishing a time slot for establishing a network of the existing TDMA and DTDMA and ADTDMA according to an embodiment of the present invention.

status TDMA (ms) DTDMA (ms) ADTDMA (ms) status Description power ON 400 400 400 Power supply Time Slot free 300 0 300 Time slot information Coarse Sync 12000 12000 12000 Obtain coarse synchronization PPLI & Node S / N & Request (PNSR) 0 0 3000 Request location information, node number Fine Sync 6000 6000 6000 Precision Synchronization Connection Slot 0 3000 0 Share time slot configuration information Master Slot (MS) 0 6000 0 Master node setup MS Relay 0 6000 0 Communicating information from the master node to the slave node Re-Connection 0 3000 0 Share timeslot configuration information for network reset Re-Master Slot (RMS) 0 6000 0 Setting up a master node for network resets RMS Relay 0 6000 0 Communicating information to the slave node via the reset master node PNSR & Re Slot 0 0 6000 Reset location information, node number, etc. Slot set Maximum Time 18700 33400 21700 Network subscription node slot setting Maximum time required Re-Slot set Maximum Time 0 15000 6000 Network Reset Subscription Node Slot Setting Max Time Spent

As shown in [Table 1] and FIG. 4, the conventional TDMA requires 18.7 seconds of network setup time and can not be reset. The conventional DTDMA requires 33.4 seconds of network setup time, and an additional time of 15 seconds Is required. However, the ADTDAM according to an embodiment of the present invention requires 21.7 seconds of network setup time and an additional time of 6 seconds when resetting. Accordingly, the present invention can reduce the maximum slot time required for the network subscription and reset node compared to the conventional method.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the embodiments are for the purpose of illustration only and are not to be construed as limitations. It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit and scope of the invention.

10: initial master node 20: slave node
110: master slot injection unit 120: master setting unit
130: Advanced data generator
140: DTDMA control unit 150:
210: master slot injection unit 220: master setting unit
230: Advanced data generator
240: DTDMA control unit 250:

Claims (12)

  1. At least one initial master node and a plurality of slave nodes,
    Each of the plurality of slave nodes calculates a separation distance between the plurality of slave nodes,
    Resets at least one slave node to the master node according to the calculation result,
    And the distance between the slave nodes is calculated by Equation (1).
    [Equation 1]
    Figure 112019032167698-pat00011

    Here, d is the separation distance (km), Tx is the transmission power of the other node, RSSI is the received signal strength, and f is the operating frequency.
  2. The Advanced Dynamic Time Division Multiple Access apparatus according to claim 1, wherein the slave node is reset as a master node when the distance between the slave nodes is less than the set distance and the number of events measured by the slave node is greater than the number of slave nodes.
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Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20060066905A (en) * 2004-12-14 2006-06-19 전자부품연구원 Master selection algorithm for minimal power consumption
KR100926232B1 (en) 2003-06-30 2009-11-09 주식회사 케이티 D-TDMA protocol control system and method using control of base station, and record medium for storing algorithm therefor
KR100966693B1 (en) 2006-06-16 2010-06-29 해리스 코포레이션 Systems and methods for a protocol transformation gateway for quality of service
KR20140001343A (en) * 2012-06-26 2014-01-07 조선대학교산학협력단 Cluster-based wireless sensor network supporting mobility for mobile sensor node and wireless sensor network thereof
JP5382810B2 (en) * 2010-07-26 2014-01-08 Necインフロンティア株式会社 Transmission method according to transmission distance, transmission device according to transmission distance, and system thereof
KR20140069648A (en) * 2012-11-29 2014-06-10 아주대학교산학협력단 Scheduling apparatus for time slot

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100926232B1 (en) 2003-06-30 2009-11-09 주식회사 케이티 D-TDMA protocol control system and method using control of base station, and record medium for storing algorithm therefor
KR20060066905A (en) * 2004-12-14 2006-06-19 전자부품연구원 Master selection algorithm for minimal power consumption
KR100966693B1 (en) 2006-06-16 2010-06-29 해리스 코포레이션 Systems and methods for a protocol transformation gateway for quality of service
JP5382810B2 (en) * 2010-07-26 2014-01-08 Necインフロンティア株式会社 Transmission method according to transmission distance, transmission device according to transmission distance, and system thereof
KR20140001343A (en) * 2012-06-26 2014-01-07 조선대학교산학협력단 Cluster-based wireless sensor network supporting mobility for mobile sensor node and wireless sensor network thereof
KR20140069648A (en) * 2012-11-29 2014-06-10 아주대학교산학협력단 Scheduling apparatus for time slot

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