KR100674868B1 - System for measuring position of network device in wireless personal area network, and its method - Google Patents

Abstract

An object of the present invention is to provide a system and method for measuring the position of a mobile object in a wireless personal communication network, which can identify a position of a mobile object to be measured through a GTS for positioning using a communication mode and a distance measurement mode in a wireless personal communication network. have.

In the wireless personal communication network of the present invention, a moving object position measuring system includes: a server for instructing position measurement on a moving object to be measured, and then calculating a position with respect to the moving object to be measured using a plurality of arrival times required for transmission; A coordinator for allocating a GTS for location measurement in a contention free communication section in a super frame according to a command of the server, and then transmitting a plurality of received arrival times to the server; And three or more fixtures assigned to the GTS for position measurement by the coordinator, wherein each of the plurality of fixtures measures a time required for arrival of a range packet signal through the position measurement GTS and is transmitted to the coordinator. Fixed group; And a mobile unit which receives the position measurement GTS from the coordinator and includes a transmission time in the range packet signal and transmits the transmission packet to the fixed bodies through the position determination GTS. Also, in the wireless personal communication network, a method for measuring a position with respect to a mobile object to be measured is proposed.

Mobile Personal Network, Mobile Object, Super Frame, GTS, Positioning

Description

METHOD AND MEASUREMENT METHOD AND METHOD FOR MOBILE POSITION MEASUREMENT IN A WIRELESS PERSONAL NETWORK {SYSTEM FOR MEASURING POSITION OF NETWORK DEVICE IN WIRELESS PERSONAL AREA NETWORK, AND ITS METHOD}

1 is a block diagram of a conventional wireless personal communication network.

2 is a block diagram of a mobile positioning system in a wireless personal communication network according to the present invention.

3 is a frame structure diagram of a beacon signal according to the present invention.

4 is a superframe structure diagram according to the present invention.

5 is a flowchart illustrating a method of measuring a mobile position in a wireless personal communication network according to the present invention.

6 is a conceptual diagram of a moving object position measurement according to the present invention.

Explanation of symbols on the main parts of the drawings

100; Server 200: Coordinator

300: fixture group 310,320,330: anchor devices

400: Network Device P-GTS: GTS for Position Measurement

RS: Range packet signal TOA1, TOA2, TOA3: Arrival time required

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mobile positioning system and method in a wireless personal communication network. In particular, in a wireless personal communication network (WPAN), a guaranteed time slot for positioning in a super frame set in advance using a communication mode and a distance measurement mode (Guaranteed) The present invention relates to a system and a method for measuring the position of a moving object in a wireless personal communication network capable of identifying a position of a moving object to be measured through Time Slot for Measuring Position (P-GTS).

In general, IEEE 802.15.4-based wireless personal area networks (WPANs) transmit information between relatively few users within a relatively short distance, and can directly communicate wirelessly without cables between peripheral devices. In particular, high-speed WPAN operates at 2.4 GHz and supports up to 55 Mbps, which enables multimedia traffic transmission. As a supplementary role of the existing communication system, the role or capability of short-range data transmission is gradually increasing.

Recently, various electronic devices (notebook computers, mobile phones, PDAs, MP3 players, etc.) are carried on the body, but these devices are not only cumbersome and inconvenient, but also time-consuming to connect by wire, so they are used separately without interworking with each other. Nor are they compatible with each other.

If short-range wireless technology is used, a network can be configured by directly communicating between devices without a cable connection between devices, thereby allowing applications to exchange information with each other.

Such a network composed of personal devices is called a wireless personal communication network. The wireless personal communication network can be used to share documents or presentations among people who attend meetings, and to access the Internet through an AP or a mobile phone in a wireless LAN. It may be. In addition, the wireless personal communication network aims to deliver information between relatively few users within a relatively short distance, and is inexpensive and power efficient solution that can be implemented in various devices because it is almost independent of the infrastructure.

Devices applied to such wireless personal communication networks include computers, PDAs, portable computers, printers, microphones, speakers, headsets, barcode readers, sensors, displays, pagers, and portable terminals such as PCS phones.

1 is a configuration diagram of a wireless personal communication network.

The wireless personal communication network shown in FIG. 1 is a coordinator 10 for controlling a wireless personal communication network and transmitting beacons at regular intervals, and a plurality of network devices 20 for receiving beacons from the coordinator 10. -1 to 20-n). At this time, the coordinator 10 forms a network and periodically transmits a beacon, and at this time, the mobile unit 20-1 to 20-n periodically receives the beacon from the coordinator 10 to the coordinator 10. ) And time synchronization at all times to communicate. In this case, the coordinator 10 determines the beacon transmission period, which is mainly dependent on the application service.

In addition, the coordinator communicates with a plurality of mobile objects at the beginning of network construction, establishes a star topology network through a scan, and then performs a registration process of the mobile device, thereby performing a channel between the coordinator and the mobile device. Complete the setup. At this time, each mobile unit and the coordinator are ready for communication of the generated data, and then the coordinator periodically transmits a beacon (Beacon) to the plurality of mobile units to perform synchronization with the plurality of mobile units.

By the way, even if a mobile phone or a laptop is connected to such a wireless personal communication network, when a large number of users are used in a company or the like, there is a problem of frequently wasting time by not finding the location of a specific mobile phone or laptop.

As described above, it is necessary to confirm where the mobile object to be measured is. However, since there is no method for identifying the position of the mobile object in the wireless personal communication network, there is a problem in that the position of the specific mobile object cannot be identified.

The present invention has been proposed to solve the above problems, and its object is to provide a pre-configured GTS (P-GTS) for super-frame positioning using a communication mode and a distance measurement mode in a wireless personal communication network (WPAN). The present invention provides a system and method for measuring the position of a mobile object in a wireless personal communication network capable of identifying a position of a mobile object to be measured.

In order to achieve the above object of the present invention, the mobile object position measuring system in the wireless personal communication network of the present invention instructs the position measurement for the mobile object to be measured, and then uses the plurality of arrival times received to be measured. A server for calculating a position with respect to the moving object; A coordinator for allocating a GTS for position measurement in a contention free communication section in a super frame according to a command of the server, and then transmitting the plurality of arrival times received to the server; A mobile unit which receives a position measuring GTS from the coordinator and includes a transmission time in the range packet signal and transmits the transmission time to each stationary body through the positioning GTS; And three or more fixtures assigned to the GTS for position measurement by the coordinator, wherein each of the plurality of fixtures measures the arrival time of the range packet signal received from the mobile unit through the position measurement GTS. The plurality of stationary bodies may include a group of stationary bodies for transmitting the plurality of arrival times to the coordinator.

The beacon signal transmitted to each fixed body may include a MAC header including a beacon identifier and a source address; A MAC payload including a GTS field including location GTS information, a pending address field including a plurality of fixed target addresses and a mobile destination address, and a beacon payload field; And a MAC footer including a frame check sum for error checking of a transmitted frame.

The beacon signal transmitted to the mobile unit includes: a MAC header including a beacon identifier and a source address; A MAC payload including a GTS field including location GTS information, a pending address field including a mobile target address and a plurality of fixed transmission addresses, and a beacon payload field; And a MAC footer including a frame check sum for error checking of a transmitted frame.

The position measurement GTS is assigned to the highest priority among the GTSs of the super frame, and the position measurement GTS is assigned to the last time slot of the super frame.

In addition, in order to achieve the object of the present invention, the moving object position measuring method in the wireless personal communication network of the present invention, according to the positioning command from the server with respect to the mobile object to be measured, the coordinator sends a beacon signal to three or more fixed bodies and A time slot assignment step of transmitting to the mobile unit an arbitrary tie slot in the contention free communication section in the super frame to the GTS for positioning; A range packet transmission step of transmitting a range packet signal including a transmission time to a plurality of fixed bodies allocated with the same position measuring GTS through the position measuring GTS, from the coordinator; Each of the plurality of stationary bodies receives a range packet signal from the mobile unit, measures an arrival time of the range packet signal, and transmits the arrival time to the coordinator during the competition communication section of the super frame. Transmitting step; The coordinator transmits a plurality of arrival times received by the coordinator to the server, and the server includes a position calculating step of calculating a position with respect to the moving object by using the plurality of received times.

The beacon signal transmitted to each fixed body may include a MAC header including a beacon identifier and a source address; A MAC payload including a GTS field including location GTS information, a pending address field including a plurality of fixed target addresses and a mobile destination address, and a beacon payload field; And a MAC footer including a frame check sum for error checking of a transmitted frame.

The beacon signal transmitted to the mobile unit includes: a MAC header including a beacon identifier and a source address; A MAC payload including a GTS field including location GTS information, a pending address field including a mobile target address and a plurality of fixed transmission addresses, and a beacon payload field; And a MAC footer including a frame check sum for error checking of a transmitted frame.

The position measuring GTS is assigned to the highest priority among the GTS of the super frame, and the position measuring GTS is assigned to the last time slot of the super frame.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the drawings referred to in the present invention, components having substantially the same configuration and function will use the same reference numerals.

2 is a block diagram of a mobile positioning system in a wireless personal communication network according to the present invention.

Referring to FIG. 2, a moving object positioning system in a wireless personal communication network according to the present invention includes a server 100, a coordinator 200, a fixed body group 300, and a moving body including three or more fixed bodies 310, 320, and 330. 400.

The server 100 is implemented as a computing system and instructs the stationary group 300 and the moving object 400 to measure the position of the moving object. Thereafter, the position of the moving object to be measured is calculated using each arrival time TOA1, TOA2, and TOA3 transmitted.

The coordinator 200 is a master of a wireless personal communication network. The coordinator 200 scans at an initial stage of driving to establish a network with a plurality of moving objects, and transmits a beacon signal to the plurality of moving objects at regular intervals after the network is constructed. On the other hand, the coordinator 200 transmits the beacon signal to the measuring object moving object and the plurality of fixed objects when the position measurement command for the measuring object moving object is received from the server 100, and the respective moving objects and the plurality of heights. In a congestion, a positioning GTS (P-GTS) is allocated to a contention free communication section (CFA) in a super frame. In addition, the coordinator 200 transmits the arrival time (TOA1, TOA2, TOA3) received from a plurality of fixed body to the server 100.

3 is a frame structure diagram of a beacon signal according to the present invention.

In FIG. 3, the frame of the beacon signal includes a MAC header (MHR: MAC HeadeR), a MAC payload (MAC payload) and a MAC footer (MFR: MAC FooteR).

The MAC header (MHR) includes a frame control field (FC) including a beacon identifier, a sequence number field (SN) indicating a sequence number for the current frame, and an address field (AD) including a source address.

The MAC payload includes a superframe specification field (SS) that defines a logical time slot for time management of transmission and reception, and information for providing a guaranteed time slot to a specific mobile object. It includes a Guaranteed Time Slot (GTS) field, a Pending Address field (PA) including an address of a mobile to be transmitted when data to be transmitted to the mobile is generated, and a beacon payload. The MAC footer (MFR) includes a frame check sum (FCS) for error checking of a transmitted frame.

When the beacon signal is transmitted to each fixed body, the frame of the beacon signal includes GTS (P-GTS) information for position measurement in the GTS field of the MAC payload, and the pending address field (PA) Contains the fixed target address and the mobile destination address. In addition, when the beacon signal is transmitted to the mobile, the GTS (P-GTS) information for position measurement is included in the GTS field of the MAC payload, and the mobile target address and the high in the pending address field (PA). Contains the congestion sender address.

4 is a structural diagram of a superframe according to the present invention.

Referring to FIG. 4, the superframe is defined as a plurality of logical time slots (approximately 16 time slots) between beacon signals for time management of transmission and reception, and a part of the plurality of time slots is a competitive communication interval (CAP). ), And the remainder of the plurality of timeslots is defined as a contention free communication interval (CFP).

The contention free communication interval (CFP) may be defined as a plurality of guaranteed time slots (GTS) assigned to a specific purpose and a non-guaranteed non-guaranteed time slot (FTS). In the present invention, the plurality of GTSs Any GTS is assigned to a position measuring GTS (P-GTS), and the mobile unit 400 transmits a range packet signal to the plurality of fixed bodies 310, 320, and 330 using the position measuring GTS (P-GTS). Do it.

In addition, the positioning GTS may be assigned the highest priority among the GTS of the super frame, and for this purpose, may be allocated to the last time slot of the super frame.

2 to 4, the plurality of fixtures 310, 320, and 330 are allocated a GTS for position measurement by the coordinator 200, and a range packet signal RS transmitted through the position measurement GTS. ), The arrival time TOA1, TOA2, and TOA3 are measured and transmitted to the coordinator 200.

The mobile unit 400 receives the GTS for position measurement from the coordinator 200 and includes the transmission time in the range packet signal RS to transmit to the fixed bodies 310, 320, 330 through the positioning GTS. do.

5 is a flowchart illustrating a method of measuring a mobile position in a wireless personal communication network according to the present invention. 5 shows a position measurement process of the present invention in a mobile positioning system in a wireless personal communication network.

6 is a conceptual diagram of a mobile body position measurement according to the present invention.

In FIG. 6, the concept of measuring the position of the moving object to be measured using three fixtures is shown.

Hereinafter, the operation and effects of the present invention will be described in detail with reference to the accompanying drawings.

In the apparatus and method of the present invention, for precise distance measurement within 1 meter, it operates by dividing into communication mode and range mode, and the communication mode is a competitive communication of the existing IEEE 802.15.4 superframe structure. Communication is performed using a CAP (Contention Access Period) and a Contention Free Period (CFP), and the distance measurement mode is a range packet using an IEEE 802.15.4 Granted time slot (GTS). Perform signal transmission and ranging.

First, the wireless personal communication system of the present invention will be described with reference to FIGS.

Referring to FIG. 2, when the server 100 of the present invention instructs the coordinator 200 to measure the position of the moving object, the coordinator 200 corresponds to a beacon signal according to the command of the server 100. The mobile unit 400 and the plurality of stationary bodies 310, 320, and 330 of the stationary group 300 are transmitted to allocate a GTS for position measurement to the contention free communication section (CFA) in the super frame.

Referring to FIG. 3, the beacon signal will be described. The beacon signal transmitted from the coordinator 200 to a plurality of fixed bodies includes a GTS field including position GTS information in a MAC payload, and a plurality of beacon signals. It includes a pending address field and a beacon payload field containing the fixed target address and the mobile destination address of the. In addition, the beacon signal transmitted from the coordinator 200 to the mobile unit 400, the MAC header includes a source address, the MAC payload (GTS field) containing GTS information for positioning, and And a beacon payload field and a pending address field including a mobile target address and a plurality of fixed send addresses.

Accordingly, the mobile unit 400 is assigned a GTS for position measurement by the coordinator 200. If this is described, the mobile unit 400 has its beacon signal as a mobile target address included in the beacon signal from the coordinator 200. Recognizes, sets the position measurement GTS through the position measurement GTS information, and recognizes the plurality of fixtures to be transmitted through the plurality of stationary transmission addresses.

Each of the plurality of fixtures 310, 320, 330 of the fixture group 300 is assigned a GTS for position measurement by the coordinator 200, which will be described in detail with reference to the beacon signal from the coordinator 200. Recognizes the beacon signal of its own with a plurality of fixed target addresses included, sets the position measurement GTS through the GTS information for position measurement, recognizes the mobile object to be received through the mobile object address, and through the source address Recognize the coordinator to send the arrival time.

Referring to FIG. 4, the GTS allocation for positioning in the mobile unit 400 and the plurality of stationary units 310, 320, and 330 is defined by the beacon signal, and the super frame is a signal transmission / reception time. For management, a plurality of logical timeslots (eg, 16 timeslots) are formed between beacon signals, wherein some of the plurality of timeslots correspond to a competitive communication interval (CAP), and among the plurality of timeslots. The remainder is the CFP. Here, the plurality of timeslots included in the contention free communication section (CFP) are composed of GTSs already allocated for a specific purpose and unallocated timeslots (FTSs) not yet allocated.

In this case, the movable body 400 and the plurality of fixed bodies 310, 320, and 330 allocate one time slot among the unscheduled time slots to the position measuring GTS, and use the position measuring GTS to move the moving object 400. ) Transmits a range packet signal to the plurality of fixtures 310, 320, 330.

On the other hand, the GTS for position measurement is set to the highest priority that has a higher priority than the other GTS, so that the communication is prioritized in the contention free communication section (CFP) of the superframe.

2 to 4, the mobile unit 400 transmits a range packet signal RS including a transmission time to the recognized plurality of fixed bodies 310, 320, and 330 through the positioning GTS.

At this time, each of the plurality of stationary (310, 320, 330), the range from the moving object 400 recognized as the mobile receiving address through the position measuring GTS allocated in the same manner as the positioning GTS assigned to the mobile unit 400 After receiving the packet signal (RS) and measuring the arrival time of the range packet signal (RS), the arrival time (TOA1, TOA2, TOA3) using the transmission time and arrival time included in the range packet signal (RS) Measure Each of the plurality of fixtures 310, 320, and 330 transmits the arrival time TOA1, TOA2, and TOA3 to the coordinator 200 recognized as the source address.

2 to 4, the coordinator 200 receives a plurality of arrival time TOA1, TOA2, and TOA3 from each of the plurality of fixed bodies 310, 320, and 330, and transmits them to the server 100. The server 100 receives a plurality of arrival times TOA1, TOA2, and TOA3 from the fixed bodies 310, 320, and 330, and uses the plurality of arrival times TOA1, TOA2, and TOA3 to be measured. The position with respect to the moving body 400 is calculated.

Referring to Figures 2 and 6 will be described with respect to the mobile unit position measurement method in a wireless personal communication network according to the present invention.

First, referring to FIGS. 2 to 6, in the time slot assignment step S100, the coordinator 200 generates three beacon signals according to the position measurement command S120 from the server 100 for the measurement target moving object. By transmitting to the fixed body 310, 320, 330 and the mobile unit 400, an arbitrary tie slot of the contention free communication section (CFP) in the super frame is allocated to the position measurement GTS (S120). At this time, the mobile unit 400 transmits an ACK signal to the coordinator 200 (S130).

Next, in the range packet transmission step (S200), the mobile unit 400, which has been assigned the position measurement GTS from the coordinator 200, detects whether the position measurement GTS time is reached (S210), and the position measurement GTS. When the time is reached, the range packet signal RS including the transmission time is transmitted to the plurality of fixed bodies 310, 320, and 330 assigned the same position measuring GTS through the position measuring GTS (S220).

Next, in the arrival time transmission step (S300), each of the plurality of fixed bodies (310, 320, 330) receives a range packet signal (RS) from the moving object 400, the arrival time of the range packet signal (RS) ( TOA1, TOA2, and TOA3 are measured (S310), and the arrival time (TOA1, TOA2, TOA3) is transmitted to the coordinator 100 during the competition communication interval (CAP) of the super frame (S320).

Next, in the position calculation step (S400), the coordinator 200 transmits a plurality of arrival time TOA1, TOA2, TOA3 transmitted to the server 100 (S410), and the server 100 The position of the moving object 100 is calculated using the received plurality of arrival times TOA1, TOA2, and TOA3 (S420).

Here, various methods may be applied to the method of measuring the position of the moving object in the server 100, but an example thereof will be described with reference to FIG. 6.

Referring to FIG. 6, when the server 100 knows each arrival time received from the plurality of fixed bodies, that is, the three fixed bodies, the server 100 knows the positions of the plurality of fixed bodies in advance, and the respective heights. The distance between the congestion and the moving body (dashed line in FIG. 6) can be known, respectively, and the position where the distance from each stationary body to the moving body overlaps in one place can be recognized as the actual position of the moving body.

In the present invention as described above, the 802.15.4a Location Position System (LPS) application is a mobile computing environment construction and location-aware service.In the mobile computing environment construction, the goal of mobile computing is appropriate to wherever a user goes. It provides a form of service. In the location-aware service, a location change of a user is recognized and an optimal service is provided. For example, automatic connection location recognition services for available peripherals, emergency notifications for multicasting (specific places such as subway stations, movie theaters, etc.) by selecting specific target locations, customers in specific locations from the server (within two miles) ) Only ad services, etc.

The present invention described above is not limited to the above-described embodiment and the accompanying drawings, but is defined by the claims, and the apparatus of the present invention may be substituted, modified, and modified in various ways without departing from the spirit of the present invention. It is apparent to those skilled in the art that modifications are possible.

According to the present invention as described above, in the wireless personal communication network (WPAN), by using the communication mode and the distance measurement mode, the position of the mobile object to be measured is measured through a pre-set super frame position GTS (P-GTS). You can see the effect.

Claims (10)

A server for instructing position measurement on the object to be measured and calculating a position on the object to be measured using a plurality of arrival times; A coordinator for allocating a GTS for position measurement in a contention free communication section in a super frame according to a command of the server, and then transmitting the plurality of arrival times received to the server; A mobile unit which receives a position measuring GTS from the coordinator and includes a transmission time in the range packet signal and transmits the transmission time to each stationary body through the positioning GTS; And At least three fixtures assigned to the GTS for position measurement by the coordinator, wherein each of the plurality of fixtures, the arrival time of the range packet signal received from the mobile unit through the position measurement GTS, respectively Thus, the plurality of fixtures is a fixture group for transmitting the plurality of arrival times to the coordinator Moving object positioning system in a wireless personal communication network comprising a. The beacon signal transmitted to each of the fixed body, A MAC header including a beacon identifier, a source address; A MAC payload including a GTS field including location GTS information, a pending address field including a fixed target address and a mobile destination address, and a beacon payload field; And MAC footer with frame checksum for error checking of transmitted frames Moving object positioning system in a wireless personal communication network comprising a. According to claim 1, The beacon signal transmitted to the moving object, A MAC header including a beacon identifier, a source address; A MAC payload including a GTS field including location GTS information, a pending address field including a mobile target address and a plurality of fixed transmission addresses, and a beacon payload field; And MAC footer with frame checksum for error checking of transmitted frames Moving object positioning system in a wireless personal communication network comprising a. According to claim 1, wherein the GTS for position measurement A mobile positioning system in a wireless personal communication network, characterized in that the highest priority among the GTS of the super frame. According to claim 1, wherein the GTS for position measurement A mobile positioning system in a wireless personal network characterized in that it is assigned to the last time slot of a super frame. According to the position measurement command from the server for the mobile object to be measured, the coordinator transmits a beacon signal to three or more fixed bodies and the mobile object to allocate an arbitrary tie slot to the GTS for positioning in the superframe. Timeslot allocation step; A range packet transmission step of transmitting a range packet signal including a transmission time to a plurality of fixed bodies allocated with the same position measuring GTS through the position measuring GTS, from the coordinator; Each of the plurality of stationary bodies receives a range packet signal from the mobile unit, measures an arrival time of the range packet signal, and transmits the arrival time to the coordinator during the competition communication section of the super frame. Transmitting step; And A position calculating step of transmitting the plurality of arrival times received by the coordinator to the server, and the server calculating a position with respect to the moving object by using the received plurality of arrival times. Moving object position measurement method in a wireless personal communication network comprising a. The method of claim 6, wherein the beacon signal transmitted to each fixed body, A MAC header including a beacon identifier, a source address; A MAC payload including a GTD filter including GTS information for positioning, a pending address field including a fixed target address and a mobile destination address, and a beacon payload field; And MAC footer with frame checksum for error checking of transmitted frames Moving object position measurement method in a wireless personal communication network comprising a. According to claim 6, Beacon signal transmitted to the moving object, A MAC header including a beacon identifier, a source address; A MAC payload including a GTS field including location GTS information, a pending address field including a mobile target address and each fixed transmission address, and a beacon payload field; And MAC footer with frame checksum for error checking of transmitted frames Moving object position measurement method in a wireless personal communication network comprising a. The method of claim 6, wherein the GTS for position measurement A method for measuring mobile position in a wireless personal communication network, characterized in that the highest priority is assigned among the GTSs of a super frame. The method of claim 6, wherein the GTS for position measurement A method for measuring mobile position in a wireless personal communication network, characterized in that it is allocated to the last time slot of a super frame.

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