KR101600746B1 - Analysis method for quality of indoor signal propagation using variable signature sequence in construction and location determination system for placing apparatus using wireless communication in construction - Google Patents

Analysis method for quality of indoor signal propagation using variable signature sequence in construction and location determination system for placing apparatus using wireless communication in construction Download PDF

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KR101600746B1
KR101600746B1 KR1020150048277A KR20150048277A KR101600746B1 KR 101600746 B1 KR101600746 B1 KR 101600746B1 KR 1020150048277 A KR1020150048277 A KR 1020150048277A KR 20150048277 A KR20150048277 A KR 20150048277A KR 101600746 B1 KR101600746 B1 KR 101600746B1
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packet
measurement device
test packet
echo back
length
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KR1020150048277A
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Korean (ko)
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김정호
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이화여자대학교 산학협력단
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    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L43/00Arrangements for monitoring or testing packet switching networks
    • H04L43/50Testing arrangements
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00Modulated-carrier systems
    • H04L27/18Phase-modulated carrier systems, i.e. using phase-shift keying includes continuous phase systems
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00Modulated-carrier systems
    • H04L27/32Carrier systems characterised by combinations of two or more of the types covered by groups H04L27/02, H04L27/10, H04L27/18 or H04L27/26
    • H04L27/34Amplitude- and phase-modulated carrier systems, e.g. quadrature-amplitude modulated carrier systems
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L41/00Arrangements for maintenance or administration or management of packet switching networks
    • H04L41/08Configuration management of network or network elements
    • H04L41/0803Configuration setting of network or network elements
    • H04L41/0806Configuration setting of network or network elements for initial configuration or provisioning
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L43/00Arrangements for monitoring or testing packet switching networks
    • H04L43/08Monitoring based on specific metrics

Abstract

A method of analyzing propagation quality in a structure using a variable sequence comprises the steps of: transmitting a first test packet, the first test packet being a digital signal having a first length at a first location in the structure, Transmitting a second test packet having a second length greater than the first length when it fails to receive a response signal for the first test packet from a second measurement device within the structure, The measuring device receiving the second test packet and transmitting an echo back packet, which is a digital signal in response to the second test packet, and the first measuring device receiving the echo back packet, And measuring the quality.

Description

TECHNICAL FIELD [0001] The present invention relates to a method of analyzing a radio wave quality in a structure using a variable sequence, and a positioning system of a device for performing wireless communication in a structure. [0002] COMMUNICATION IN CONSTRUCTION}

The techniques described below relate to techniques for analyzing propagation quality between specific locations within a structure and for placing wireless communication devices within the structure.

 Recently, smart buildings equipped with various sensors are becoming an issue. In smart buildings, various sensors that acquire certain information are used.

Smart buildings are typically large buildings, and a large number of sensors are placed in large internal spaces. Therefore, in consideration of the cost burden due to the wired line, the damage of the structure, and the difficulty of design, the smart building minimizes the section connecting the wired sensor and wirelessly performs the communication between the sensors or between the sensor and the AP.

Korean Patent Publication No. 2014-7015400 Korea Patent Publication No. 2009-0092695

The arrangement of the sensors in the structure is generally based on the experience of the installer or is arranged in a zone of a certain size. However, depending on the structure of the actual structure, the signal transmission may not be smooth regardless of the distance between the transmitting apparatus and the receiving apparatus.

The technique described below attempts to determine in advance whether a communication is smoothly performed at a location where the sensor is disposed in a structure such as a smart building, to determine the position where the sensor is disposed.

The technique described below seeks to determine the point at which the sensor is to be placed by analyzing the characteristics of propagation of the propagation between two points in the structure using packets having sequences of different lengths.

The solutions to the technical problems described below are not limited to those mentioned above, and other solutions not mentioned can be clearly understood by those skilled in the art from the following description.

A method for analyzing propagation quality in a structure using a variable sequence rule comprises the steps of: transmitting a first test packet at a first location in a structure, the first measurement device being a digital signal having a first length; Transmitting a second test packet having a second length greater than the first length when the second measurement device fails to receive a response signal for the first test packet from the second measurement device, Receiving a second test packet, transmitting an echo back packet as a digital signal in response to the second test packet, and measuring a channel quality of a current communication channel based on the echo back packet from the first measurement device do.

A positioning system for placement of a device for performing wireless communication in a structure transmits a digitally modulated test packet located at a first location in a building and to a specific channel, A first measurement device that transmits a second test packet having a second length that is longer than the first length and that receives the echo back packet from the second measurement device and measures the channel quality of the specific channel when the echo back packet is not received, And a second measuring device located at a second location in the building and receiving a second test packet and transmitting an echo back packet having a second length.

The techniques described below can measure the quality of a radio wave without wasting energy using a sequence of appropriate lengths depending on the distance between the two points and / or the available power, which are located at two points in the structure.

The effects of the techniques described below are not limited to those mentioned above, and other effects not mentioned can be clearly understood by those skilled in the art from the following description.

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is an example of a block diagram showing the configuration of a positioning system of an apparatus for performing wireless communication in a structure. Fig.
Figure 2 is an example of a flowchart for a method of analyzing radio wave quality within a structure using a variable sequence.
3 shows an example of the configuration of a packet used for radio wave quality measurement.
4 is another example of a flowchart for a method of analyzing radio wave quality in a structure using a variable sequence.
5 is an example of a flow chart of the operation of the first measurement device for transmitting test packets.
6 is an example of a flow chart of the operation of the second measurement apparatus for transmitting an echo back packet.

The following description is intended to illustrate and describe specific embodiments in the drawings, since various changes may be made and the embodiments may have various embodiments. However, it should be understood that the following description does not limit the specific embodiments, but includes all changes, equivalents, and alternatives falling within the spirit and scope of the following description.

The terms first, second, A, B, etc., may be used to describe various components, but the components are not limited by the terms, but may be used to distinguish one component from another . For example, without departing from the scope of the following description, the first component may be referred to as a second component, and similarly, the second component may also be referred to as a first component. And / or < / RTI > includes any combination of a plurality of related listed items or any of a plurality of related listed items.

As used herein, the singular " include "should be understood to include a plurality of representations unless the context clearly dictates otherwise, and the terms" comprises & , Parts or combinations thereof, and does not preclude the presence or addition of one or more other features, integers, steps, components, components, or combinations thereof.

Before describing the drawings in detail, it is to be clarified that the division of constituent parts in this specification is merely a division by main functions of each constituent part. That is, two or more constituent parts to be described below may be combined into one constituent part, or one constituent part may be divided into two or more functions according to functions that are more subdivided. In addition, each of the constituent units described below may additionally perform some or all of the functions of other constituent units in addition to the main functions of the constituent units themselves, and that some of the main functions, And may be carried out in a dedicated manner. Therefore, the existence of the respective components described in this specification will be functionally interpreted, and for this reason, the configuration of the components according to the positioning system 100 of the apparatus for performing wireless communication in the structure described below is not limited to the following It should be clear that it can be different from the corresponding drawings to the extent that the object of the described technique can be achieved.

Also, in performing a method or an operation method, each of the processes constituting the method may take place differently from the stated order unless clearly specified in the context. That is, each process may occur in the same order as described, may be performed substantially concurrently, or may be performed in the opposite order.

A structure means an object or a building made of a certain material, but in the following description, the structure means an architectural structure.

The technique described below is for determining the position of a sensor device installed in a structure. That is, whether or not communication is smoothly performed between a point at which the first measuring apparatus is located and a point at which the second measuring apparatus is located using the first measuring apparatus and the second measuring apparatus described below before setting the sensor apparatus in the structure In advance. The person who wants to verify the position determines the optimal position by changing the positions of the first measuring device and the second measuring device. The measuring device is preferably a portable device that can be carried by a person.

The first measurement device is a device that transmits an initial signal for communication quality measurement, and the second measurement device is an device that receives an initial signal and transmits an echo back packet. The hardware configuration of the first measuring device and the second measuring device may be the same. Or a device having a different hardware structure.

The sensor device transmits data collected by itself based on various wireless communication techniques or transmits data transmitted by another device. The sensor device includes various devices such as a temperature sensing sensor, a humidity sensing sensor, a light sensing sensor, a motion detection sensor, an image acquisition sensor, and the like, which are used in smart buildings and the like.

1 is an example of a block diagram illustrating the configuration of a positioning system 100 of an apparatus for performing wireless communication within a structure.

Fig. 1 (a) shows a first measuring device 110 and a second measuring device 120 for confirming the communication state of the sensor device in the structure. The first measuring device 110 is located on the wall surface of two layers of the structure and the second measuring device 120 is located on the first exciting bottom surface of the structure. The position where the first measuring device 110 is located is referred to as a first position and the position where the second measuring device 120 is located is referred to as a second position. As a result, it is intended to check whether communication is smoothly performed between the first position and the second position. If the operator judges that the communication is smoothly performed at the first position and the second position, the operator can separately record the position or store the position in the measuring device. Thereafter, the sensor devices may be respectively disposed at the first and second positions in the sensor disposing process, or an AP may be disposed at one position and receive sensor signals at the remaining positions.

The location system 100 of the device performing wireless communications within the structure is configured to transmit a digitally modulated test packet located at a first location in the structure and to a specific channel and to echo back from the second measurement device 120. [ A first measurement device 110 for receiving a signal and measuring a channel quality of a specific channel and a second measurement device 120 located at a second location in the structure and receiving a test packet and transmitting an echo back packet to a specific channel do.

The positioning system 100 of the apparatus for performing wireless communication within the structure may also include a repeater 130 for relaying signals of the first measurement apparatus 110 and the second measurement apparatus 120.

1 (b) is an example of a block diagram showing the configurations of the first measuring device 110 and the second measuring device 120. As shown in FIG. The first measuring device 110 and the second measuring device 120 have the same configuration.

The signal generation unit 111 of the first measurement apparatus 110 is a configuration for generating a test packet for testing. The test packet will contain a predetermined symbol. Various types of digital modulation schemes for generating test packets can be used. For example, schemes such as PSK (Phase Shift Keying) or QAM (Quadrature Amplitude Modulation) may be used.

The transmitting / receiving unit 112 of the first measuring apparatus 110 transmits the test packet and receives the echo back packet. The quality measuring unit 113 of the first measuring apparatus 110 measures the quality based on the received echo back packet. Furthermore, quality measurement may be an important factor not only of the signal itself but also how long after the first measurement device 110 has transmitted the test packet, the echo back packet is received (time required for signal transmission). The measurement data storage unit 114 of the first measurement apparatus 110 stores the quality state of the channel used by the first measurement apparatus 110. [

The signal generating unit 121 of the second measuring apparatus 120 is configured to generate an echo back packet and the transmitting and receiving unit 122 receives the test packet and transmits the echo back packet. The quality measurement unit 123 of the second measurement apparatus 120 measures the quality status of the channel based on the received test packet. The measurement data storage unit 124 stores the quality status of the measured channel to be.

On the other hand, the first measuring device 110 basically transmits two test packets. And receives the first echo back packet from the second measurement device 120 in response to the first test packet. The first measurement device 110 transmits a second test packet after receiving the first echo back packet and receives a second echo back packet from the second measurement device 120 in response thereto. Through this process, the first measurement apparatus 110 can measure the channel quality twice using the first echo back packet and the second echo back packet. Further, the second measuring apparatus 120 may measure the channel quality using the test packet received by itself.

2 is an example of a flowchart for a method 200 for analyzing propagation quality within a structure using a variable sequence. The first measurement device 110 and the second measurement device 120 can transmit test packets and echo back packets on the same communication channel, respectively.

First, the first measuring device 110 can determine the length of a test packet transmitted by itself. The test packet transmitted by the measuring device is gradually attenuated according to the length of the path through which the signal passes. Also, in buildings, test packets can be attenuated more quickly because there are many obstacles that interfere with signal transmission inside. Therefore, if the length of the test packet is long, the signal can be transmitted to a measuring device at a farther distance. Of course, if the first measuring device 110 increases the power to transmit the test packet, the signal can also be transmitted to a further distance. If the measurement device is a portable device, it has a limited power, so it may be advantageous to lengthen the length of the test packet itself rather than to increase the transmit power to deliver the test packet away.

If the first measuring device 110 knows the distance between the first measuring device 110 and the second measuring device 120, the length of the test packet may be determined to have a length proportional to the distance. Further, the first measurement apparatus 110 may shorten the length of the test packet if the transmission power is large considering the transmission power of the first measurement apparatus 110, and may determine the length of the test packet if the transmission power is small.

The length of the test packet may be determined empirically or may be determined through repetitive signaling. Further, an administrator using the measuring apparatus may be set up.

The length determined in step 210 for the test packet or the length that the measuring apparatus has as a default is called a first length.

Then, at a first location within the structure, the first measurement device 110 transmits a first test packet, which is a digital signal having a first length (220). The second measurement device 120 then receives the first test packet at a second location within the structure and transmits an echo back packet in response to the first test packet (230).

The first measurement apparatus 110 may measure the channel quality of the current communication channel based on the received echo back packet (240).

 The first measurement device 110 measures a channel quality based on at least one of a time interval at which the echo back packet is received after the first test packet is transmitted, a strength of the signal including the echo back packet, or a rate of the echo back packet . Channel quality can be measured on several criteria.

The time interval at which the first measurement apparatus 110 receives the echo back packet received as a response after the first measurement apparatus 110 transmits the first test packet may be a reference. The first measurement apparatus 110 can determine that the quality of the signal transmission path or the communication channel is good so that the echo back packet, which is a response signal to the first test packet, can arrive quickly.

Also, the first measurement device 110 may determine the quality of the channel based on the strength of the signal including the received echo back packet. The first measurement apparatus 110 can determine that the quality of the communication channel is good if the strength of the signal including the echo back packet is large. The strength of the signal including the echo back packet can be easily determined by comparing the power value transmitted by the second measurement apparatus 120 with the echo back packet. Further, if the first measuring device 110 and the second measuring device 120 use the same transmission power, the signal intensity of the first test packet transmitted by the first measuring device 110 and the intensity of the signal including the echo back packet You can also compare. Or the first measuring device 110 stores the intensity of a signal (standard signal) including an echo back packet transmitted from the second measuring device 120 at a reference distance in the absence of an obstacle, May compare the strength of the standard signal with a signal including an actual echo back packet received within the structure.

If the contents of the echo back packet are known in advance, the first measurement apparatus 110 may decode the received signal and determine how many packets have arrived correctly based on the contents of the decoded signal. And determines the quality of the communication channel based on the transmission rate of the echo back packet.

3 shows an example of the configuration of a packet used for radio wave quality measurement. It is assumed that the test packet generated by the first measuring device 110 and the echo back packet measured by the second measuring device 120 have basically the same configuration.

The packet includes a synchronization sequence for synchronization with the receiving signal and a test sequence for channel quality measurement. The test sequence may be data representing a specific character, or may be a sequence of bits with no meaning. The number to the right of the test sequence in the packet means the identifier for the sequence block. That is, FIG. 3 (a) and FIG. 3 (b) all show N sequence blocks. The set of sequences shown in Fig. 3 (a) may be one packet.

Fig. 3 (b) shows a packet having a test sequence longer in length than Fig. 3 (a). FIG. 3C shows a packet having the same sequence block as FIG. 3 (a) but having the number of sequence blocks greater than N (that is, N <M).

Referring to FIG. 2, the first measuring apparatus 110 may measure the distance between the first measuring apparatus 110 and the second measuring apparatus 120 or the transmission power of the first measuring apparatus 110, ), The packet of Fig. 3 (b), or the packet of Fig. 3 (c). Although three packets are shown in FIG. 3, various packets having different test packet lengths may be used.

Furthermore, the test packet and / or the echo back packet may have a structure different from the structure shown in Fig.

Figure 4 is another example of a flowchart for a method 300 for analyzing propagation quality within a structure using a variable sequence. 4, the length of the test packet can be changed in the middle of operation of the first measuring device 110, unlike FIG. That is, the first measuring device 110 can increase the length of the test sequence of FIG.

First, a first measurement device 110 disposed at a first location in the structure transmits a first test packet 310, which is a digital signal having a first length.

Then, the first measuring device 110 waits whether or not to receive the echo back packet which is the response signal for the first test packet within the reference time. If the echo back packet does not arrive within the reference time, the first measurement device 110 transmits a new second test packet having a second length (320). The second test packet may be a packet with a longer test sequence (Fig. 3 (b)) than the first test packet, or a packet with more sequence blocks (Fig. 3 (c)) than the first test packet.

Although not shown in FIG. 4, if the first measurement device 110 fails to receive a response signal for the second test packet within the reference time, it may transmit a test packet longer than the second test packet. As a result, the first measuring device 110 transmits a signal while increasing the length of the test packet until it receives a response signal for the test packet.

In this process, a process of repeatedly transmitting test packets may occur. Therefore, it may be important to set the first length of the initial test packet appropriately. It may also be important to properly determine the length of the second test packet to be transmitted if the response signal to the first test packet of the first length is not received. In other words, it may be important to appropriately determine the unit of length that will increase if a response signal is not received. Further, when the first measuring apparatus 110 does not receive a response signal for the test packet, it may increase the length dynamically rather than constantly increasing the length unit every time. If the first measurement apparatus 110 increases the test packet by a first increment unit a, the second test packet may be incremented by an increment unit b larger than a.

The second measurement device 120 then receives the first test packet at a second location in the structure and transmits an echo back packet in response to the first test packet (330).

The first measurement device 110 may measure the channel quality of the current communication channel based on the received echo back packet (340). The first measurement device 110 measures a channel quality based on at least one of a time interval at which the echo back packet is received after the first test packet is transmitted, a strength of the signal including the echo back packet, or a rate of the echo back packet .

Figure 5 is an example of a flowchart for an operation 400 of a first measurement device that transmits a test packet.

It is assumed that the measuring device is in the first position and the second position of the structure. The apparatus in which the user transmits the initial test packet to measure the quality of the communication channel can operate as the first measuring apparatus described above. In this case, the first measuring device 110 and the second measuring device 120 perform the same function with the same device.

First, the first measurement apparatus 110 transmits a test packet (410). Thereafter, the first measurement device 110 waits for an echo back packet from the second measurement device 120 for a reference time (420).

If the echo back packet is not received during the reference time, the first measurement apparatus 110 increases the length of the test packet (step 440). Thereafter, the first measurement device 110 transmits a test packet having an increased length to the previous test packet (420).

If the echo back packet is normally received, the first measurement device 110 measures the channel quality based on a signal including the echo back packet received (450). Then, it is determined whether the quality measurement of the channel is finished (460), and the measurement can be continued by repeatedly transmitting the test packet to continue the measurement.

6 is an example of a flowchart for an operation 500 of a second measurement device that transmits an echo back packet. For convenience of explanation, a test packet initially received by the second measuring apparatus 120 is referred to as a second test packet.

The second measurement device 120 is initially in a waiting state (510), and when receiving the second test packet (520), it operates as the second measurement device 120. The second measurement apparatus 120 transmits an echo back packet after receiving the test packet (530).

The second measuring device 120 then waits for the third test packet of the first measuring device 110 during the reference time (540). That is, the first measuring device 110 transmits the third test packet when receiving the echo back packet. The second measuring apparatus 120 confirms whether the third test packet is normally received during the reference time (550).

If the third test packet is not received during the reference time, the second measurement device 110 increases the length of the echo back packet (560), and the second measurement device transmits an echo back packet with the increased length (530) .

If the third test packet is normally received within the reference time, the second measurement device 120 may measure the channel quality based on the third test packet (step 570). The process by which the second measurement device 120 measures the channel quality state is the same as the operation of the first measurement device 110.

Then, it is determined whether the measurement is completed (580), and if not, the test packet is returned to the standby state for receiving the test packet (510).

Further, the first measurement device 110 and / or the second measurement device 120 may further include a display device for outputting information on the measured channel quality state, Lt; / RTI &gt;

Further, the first measurement device 110 and / or the second measurement device 120 may compare the measured channel quality with a reference value to determine whether the sensor is suitable for placement. The first measurement device 110 and / or the second measurement device 120 are configured to receive the test packet and the echo bag 120 at a first location where the first measurement device 110 is currently located and at a second location where the second measurement device 120 is located. The first and second positions can be stored when the measured channel quality is equal to or greater than the reference value (when the channel quality is appropriate).

The location in the structure may be input by a user directly by inputting specific location information, or may utilize a conventional technique (such as a technique using a WiFi AP) for locating a structure.

It should be noted that the present embodiment and the drawings attached hereto are only a part of the technical idea included in the above-described technology, and those skilled in the art will readily understand the technical ideas included in the above- It is to be understood that both variations and specific embodiments which can be deduced are included in the scope of the above-mentioned technical scope.

100: Positioning system of a device performing wireless communication in a structure
110: first measuring device 111: signal generating unit
112: Transmitting / receiving unit 113: Quality measurement unit
114: Measurement data storage unit 120: Second measurement device
121: Signal Generation Unit 122: Transmission /
123: Quality measurement unit 124: Measurement data storage unit
130: Repeater

Claims (12)

  1. Transmitting a first test packet at a first location within the structure, the first measurement device being a digital signal having a first length to a particular channel;
    If the first measurement device fails to receive a response signal for the first test packet from the second measurement device within the reference time, transmits a second test packet having a second length longer than the first length to the specific channel step;
    Receiving the second test packet from the second measurement device at a second location in the structure and transmitting an echo back packet as a digital signal in response to the second test packet; And
    Wherein the first measurement device measures a channel quality of a current communication channel based on the echo back packet,
    Wherein the first measurement device measures a channel quality of the echo back packet based on at least one of a time interval of receiving the echo back packet after transmitting the second test packet, a strength of a signal including the echo back packet, At least one of the first measuring apparatus and the second measuring apparatus analyzes the radio wave quality in the structure using a variable sequence storing the first position and the second position when the channel quality is equal to or greater than the reference value Way.
  2. The method according to claim 1,
    Wherein the first measurement device analyzes a quality of a radio wave in a structure using a variable sequence that digitally modulates the first test packet and the second test packet using a PSK (Phase Shift Keying) method or a QAM (Quadrature Amplitude Modulation) method.
  3. The method according to claim 1,
    Wherein the first measurement device transmits the first test packet and the second test packet on a specific channel and uses the variable sequence to transmit the echo back packet to the specific channel to the second measurement device, .
  4. The method according to claim 1,
    Wherein the first length is a variable sequence that is a length corresponding to a distance between the first measurement device and the second measurement device or a transmission power of the first measurement device.
  5. The method according to claim 1,
    When the first measuring device does not receive a response signal for the second test packet from the second measuring device within the reference time in the step of transmitting the second test packet, 2 A method for analyzing the quality of radio waves in a structure using a variable sequence that transmits test packets.
  6. delete
  7. The method according to claim 1,
    Wherein the echo back packet is for analyzing the quality of radio waves in the structure having the second length.
  8. The method according to claim 1,
    The first measurement device transmitting a third test packet having the second length; And
    Wherein the second measurement device receives the third test packet, transmits the echo back packet, and determines a time interval when the third test packet is received, a strength of a signal including the third test packet, And measuring a channel quality based on at least one of a transmission rate of the transmission channel and a transmission rate of the transmission channel.
  9. The method according to claim 1,
    The first measurement device transmitting a third test packet having the second length;
    The second measurement device receiving the third test packet and transmitting a second echo back packet; And
    Further comprising the step of the first measurement device receiving the second echo back packet and measuring the channel quality based on the second echo back packet.
  10. Modulated first test packet located at a first position in a building and having a first length at a specific channel and does not receive a response signal for the first test packet from the second measurement device within a reference time, A first measurement device that transmits a second test packet having a second length longer than the first length to the channel, receives an echo back packet from the second measurement device and measures a channel quality of the specific channel; And
    And a second measurement device located at a second location in the building and receiving the second test packet and transmitting the echo back packet having the second length,
    Wherein the first measurement device measures a channel quality of the echo back packet based on at least one of a time interval of receiving the echo back packet after transmitting the second test packet, a strength of a signal including the echo back packet, Wherein at least one of the first measuring device and the second measuring device stores the first position and the second position when the channel quality is equal to or greater than a reference value, .
  11. delete
  12. 11. The method of claim 10,
    Wherein the length of the second test packet corresponds to the transmission power of the first measurement device and the distance between the first measurement device and the first measurement device.

KR1020150048277A 2015-04-06 2015-04-06 Analysis method for quality of indoor signal propagation using variable signature sequence in construction and location determination system for placing apparatus using wireless communication in construction KR101600746B1 (en)

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