KR20080098181A - Terminal Location Measurement System and Method in Multiple Wireless Private Networks - Google Patents

Abstract

The present invention relates to a terminal positioning system and method in a multiple wireless private network that receives a Zone ID broadcast message from the AP (Access Point) to determine which AP the wireless private network terminal is located.

A terminal positioning system in a multiple wireless private network of the present invention is a terminal positioning system in a multiple wireless private network, comprising: a plurality of APs connected to a wireless private network terminal through wireless mobile communication and periodically transmitting Zone ID broadcast messages; Point), a wireless private network terminal capable of wireless communication and receiving the Zone ID broadcast message transmitted from the plurality of APs and determining which AP it is located in and transmitting to the AP, and from the AP to the wireless private network terminal. Includes a Location Based Service (LBS) device for receiving and storing location information.

Description

Terminal Position Measurement System and Method for Multiple Wireless Private Networks {Wireless Personal Area Network-Based Measuring System of Phone Position and Method Thereof}

1 is a view for explaining a position measuring method in a conventional wireless private network.

2 is a block diagram illustrating a terminal position measurement system in a wireless private network according to an embodiment of the present invention.

3 is a block diagram illustrating a method for measuring a terminal location in a wireless private network according to an embodiment of the present invention.

4 is a flowchart illustrating a process of determining whether a zone enters a wireless private network terminal in a location measuring method according to an exemplary embodiment of the present invention.

5 is a flowchart illustrating a process of determining whether or not to enter a zone change of a wireless private network terminal in a location measuring method according to an embodiment of the present invention.

<Description of Symbols for Major Parts of Drawings>

200: location measurement system 210: wireless private network terminal

230a, 230b, 230c: AP (Access Point)

The present invention relates to a terminal location measurement system and method, and more particularly, to a location measurement system and method for determining the location of a terminal using a zone ID broadcast message transmitted from a plurality of access points (APs) in a multiple wireless private network. It is about.

The location measurement method of the location measurement system for providing location information is largely as follows.

Firstly, a mobile station (MS) receives a signal transmitted from a base station (BS) of a mobile communication system and measures a location by comparing the strength of the received signal with a statistical probability distribution. There is a way.

Second, there is a method (Direction Finding System) to measure the current position of the mobile communication terminal by measuring the angel of Arrival (AOA) of the signal transmitted from the base station.

Third, a time of arrival (TOA) method for identifying a location by specifying the arrival time of a radio wave, wherein the TOA method uses a relative difference between the times when radio waves transmitted from two base stations arrive at the mobile communication terminal. Time Difference of Arrival (TDOA) method for measuring the position of the mobile communication terminal and a ranging position location system (RPLS) method for measuring the position of the mobile communication terminal using the distance between the base station and the mobile communication terminal. The TOA positioning method is also used for a method using a GPS satellite known as a representative positioning system.

Referring to FIG. 1, a RPLS method for identifying a location of a mobile communication terminal using a distance between a base station and a mobile communication terminal among the third methods, the first base station (BS1) 20 is a time stamp (Time Stamp) The signal is transmitted to the mobile communication terminal 10, the mobile communication terminal 10 receives the time stamp signal transmitted from the first base station (BS1) 20, and confirms the time required for reception, thereby, the first base station Check the distance r1 from (BS1) (20).

In addition, the mobile communication terminal 10 receives a time stamp signal transmitted from the second base station (BS2) 22 and checks the time required for reception, thereby confirming the time required for reception with the second base station (BS2) 22. Check the distance r2.

Similarly, by receiving a time stamp signal transmitted from the third base station (BS3) 24 and confirming the time required for reception, the distance r3 to the third base station (BS3) 24 is confirmed. .

As such, when the three base stations 20, 22, and 24 around the mobile communication terminal 10 draw a circle with the distances r1, r2, and r3 measured as described above, the points where the three circles meet The mobile communication terminal 10 is located at the point where it meets.

For Location Based Service (LBS), the LBS server acquires location information from the mobile communication terminal 10 by a command of an LBS server (not shown) to determine the location of the specific mobile communication terminal 10. Searching has become mainstream. In this case, whenever the location information is required, the LBS server transmits a request message to the specific mobile communication terminal 10, and the mobile communication terminal 10 transmits the location information to the LBS server every time a location request message occurs. It requires a certain amount of network resources.

That is, each time the LBS is needed, the LBS server requests location registration from the mobile communication terminal 10 or calculates location information from the mobile communication terminal 10 in a manner such as base station-based positioning or GPS-based positioning. It receives a position value accordingly, or receives the position of the mobile communication terminal 10 measured by a base station (or a wireless communication device having a similar function) or a server system. In this method, the location request from the LBS server should be made to the mobile communication terminal 10 for all LBS, and for this purpose, another device (for example, base station-based or GPS-based, etc.) of the mobile communication network may be used. Communication between the system) and the mobile communication terminal 10 and upload of continuous location data.

At this time, the positioning may be performed at the request of the LBS server every time by using a positioning system (for example, a home location register (HLR) / mobile telephone exchange (MSC), a mobile positioning center (MPC) / position determination equipment (PDE) or the like). Similarly, positioning is performed by communication between the device serving as a position measurement and the like and the mobile communication terminal 10, and the mobile communication terminal 10 transmits this value to the LBS server through the positioning system or directly. Will be sent.

As described above, in the case of using the above-described TOA positioning method, it is possible to more accurately identify the location of the base station in the radio wave receiving area, but in order to confirm the location, it is necessary to connect and communicate with various equipments each time. By incurring a considerable load on both the mobile communication terminal 10 and the positioning systems, it is necessary to add expensive positioning system equipment and to measure the TOA in the mobile communication terminal 10 as well as the mobile communication network. This becomes necessary and the price of the mobile communication terminal 10 rises.

Moreover, there is a problem in that a cost problem occurs not only for a service provider but also for a user of a mobile communication service in the case of a sufficient service only by identifying an area in which a mobile communication terminal exists rather than an exact location in a radio receiving area of a base station.

The present invention has been made to solve the problems and disadvantages described above, the AP (Access Point) sends a Zone ID broadcast message, the wireless private network terminal receives the Zone ID broadcast messages from the AP (Access Point) And a terminal location measurement system and method in a multiple wireless private network for determining which AP the wireless private network terminal is located in by determining whether the wireless private network terminal has entered the zone based on whether it has stayed in the same zone for a predetermined time or more. There is a technical problem.

In accordance with an aspect of the present invention, there is provided a terminal positioning system in a multiple wireless private network, comprising: a plurality of APs connected to a wireless private network terminal through wireless mobile communication and periodically transmitting a Zone ID broadcast message; Access Point), a wireless private network terminal capable of wireless communication and receiving the Zone ID broadcast message transmitted from the plurality of APs and determining which AP it is located in and transmitting to the AP, and from the AP to the wireless private network terminal. It includes a location based service (LBS) device for receiving and storing the location information of the.

According to an aspect of the present invention, there is provided a method for measuring a terminal location in a multiple wireless private network, wherein the plurality of APs includes a plurality of APs. A first step of periodically transmitting a Zone ID broadcast message, a second step of the wireless private network terminal receiving the Zone ID broadcast message in a zone of the AP, and the wireless private network terminal broadcasting the same Zone ID in the zone A third step of determining whether to enter the zone when receiving a plurality of messages continuously; and when the wireless private network terminal determines that the wireless private network terminal has entered the zone, the location information of the wireless private network terminal is located by the wireless private network terminal. It is delivered to a location based service (LBS) device through an AP installed in a zone. Includes a fourth step.

The wireless technologies developed to date are 2.5 / 3G cellular wireless wide area network (WAN) technology, also known as wireless DSL (Digital Subscriber Line), which is widely available to the public depending on transmission coverage and utilization applications. Network (LAN) technology, wireless local area network (LAN) technology for establishing a local area wireless communication network, and wireless personal area network (PAN) technology, which is a short-range personal wireless communication technology, can be classified into four types.

Wireless PAN technologies include Bluetooth, Ultra Wide Band (UWB), and Zigbee. ZigBee is currently in the spotlight as a competitive short-range wireless communication technology in areas such as sensor networks. ZigBee is a technology that combines low-power ZigBee transceivers with sensors (motion, light, pressure, temperature, humidity, etc.) to form large sensor networks. For example, building managers can use ZigBee for lighting, fire detection, and heating and cooling systems in buildings to perform building system management and control remotely from wireless devices rather than from the management room. In addition, the patient of the hospital can be equipped with a ZigBee device on his body and the sensor periodically measures the state and health of the sensor can wirelessly transmit the diagnostic information to the server. ZigBee will be used to create automated sensor networks for a variety of applications, including home, industrial, medical and military.

IEEE defined the 802.15.4 standard as a low-cost, low-power PAN technology in May 2003.The Zigbee Alliance, which was established to promote industry, including marketing and product certification, has network / security on the PHY and MAC layers defined by the IEEE. We are working on defining additional layers. According to the IEEE 802.15.4 standard, DSSS (Digital Sequence Spread) in three frequency bands: 868Mhz (BPSK / 1 channel / Europe), 902-928Mhz (BPSK / 10 channel / US), 2.4Ghz (OQPSK / 16 channel / World) Spectrum) is defined to support 20-250Kbps transmission speed up to 100m. In addition, up to 65,000 nodes can be used by allocating 64-bits to addresses, using Carrier Sense Multiple Access-Collision Avoidance (CSMA-CA) similar to wireless LAN as an access method, and using the Quality of Service (QOS). In order to achieve this, a GTS (Guaranteed Time Slot) mechanism is introduced. The network can be configured with a network / security layer and topology in IEEE 802.15.4. Above all, it can be extended to several kilometers or more, and networks can be configured in various topologies such as ad hoc / star / mesh.

The biggest feature of Zigbee / 802.15.4 is its ultra low power consumption. ZigBee's average power consumption during transmission and reception is about 50mW, which is much lower than that of UWB (200mW) / Wireless LAN (1W). In addition, the ZigBee slave device uses power only when a call comes from the master device, which can be used for up to 2-3 years with a battery installed.

2 is a block diagram illustrating a terminal position measurement system in a wireless private network according to an embodiment of the present invention.

Referring to FIG. 2, the location measurement system 200 includes a wireless private network terminal 210, an access point (AP) 230a, 230b, 230c (hereinafter referred to as 230) and a location based service (LBS) (not shown). Device.

The wireless private network terminal 210 is a terminal capable of mobile communication based on a wireless private network including any one of communication modules such as Bluetooth, Ultra Wide Band (UWB), Zigbee, and the like.

An access point (AP) 230 is a device that is connected by wireless mobile communication and periodically transmits a Zone ID broadcast message. Here, the zone refers to an area where the radio frequency (RF) of the AP arrives. However, the size of the zone of the AP can be adjusted by adjusting the RF output of the AP.

In addition, the AP 230 transmits the Zone ID broadcast message by including the transmission cycle information of the broadcast message and the radio frequency (RF) information of the AP 230. In this case, the RF information becomes an identifier for identifying the AP 230.

The LBS device receives the location information from the AP 230, stores the location information, and provides the location information of the terminal to at least one application server providing the LBS.

3 is a block diagram illustrating a location measuring method based on a wireless private network terminal according to an embodiment of the present invention.

Referring to Figure 3 will be described in detail how the position measurement system 200 based on the wireless private network terminal 210 performs the position measurement.

First, the plurality of APs periodically transmit a Zone ID broadcast message to each Zone (S201). However, the Zone ID broadcast message sent by the AP may include cycle information of the broadcast message and Radio Frequency (RF) information of the AP.

When the wireless private network terminal enters the zone of the AP, it receives a Zone ID broadcast message (S203).

After the step S203, it is determined whether the wireless private network terminal has entered the zone based on whether the wireless private network terminal has stayed in the same zone for a predetermined time or more (S205). This will be described in detail with reference to FIG. 4.

In step S205, if it is determined that the user enters the zone by staying in the same zone for a predetermined time or more, the location information of the wireless private network terminal is transmitted to a location based service (LBS) device (S207).

The LBS device registers the location information received in step S205 (S209).

4 is a flowchart illustrating a process of determining whether a zone enters a wireless private network terminal in a location measuring method according to an exemplary embodiment of the present invention.

Referring to FIG. 4, the wireless private network terminal receives a Zone ID broadcast message when entering the Zone of the AP (S203). In this case, since the wireless private network terminal may receive two or more Zone ID broadcast messages, it is preferable to determine that the wireless private network terminal is located in the corresponding zone when the same Zone ID is continuously received a plurality of times.

To this end, it is determined whether the Zone ID of the Zone ID broadcast message received in step S301 is the same as the previous Zone ID (S303).

If the Zone ID determined in step S303 is different from the previous Zone ID, that is, when the terminal moves the Zone or enters the Zone for the first time, it is determined whether the received Zone ID broadcast message is the first Zone ID broadcast message received ( S305).

If the Zone ID determined in step S303 is the same as the previous Zone ID or if the Zone ID broadcast message in step S305 is determined to be the first Zone ID broadcast message, the number of reception of the Zone ID broadcast message is counted (S307).

In step S307, it is determined whether the count value is greater than or equal to the specified number to determine that the AP has entered the zone (S309).

If the count value in step S309 is greater than or equal to the specified number, it is determined that the wireless private network terminal has entered the zone of the AP, and the location information is transmitted to the LBS device through the AP (S207). End position recognition.

If the count value in step S309 is smaller than the specified number, it is determined that the zone of the AP is not entered, and the process returns to step S301.

If it is determined in step S305 that the Zone ID broadcast message is not the first Zone ID broadcast message, step S503 will be described in detail with reference to FIG. 5. That is, when a wireless private network terminal located in a zone of a specific AP moves to a zone of an adjacent AP overlapping with it, when the broadcast message is not received from an AP located in a previous zone, the location information of the wireless private network terminal is changed.

5 is a flowchart illustrating a process of determining whether or not to enter a zone change of a wireless private network terminal in a location measuring method according to an embodiment of the present invention.

If it is determined that the Zone ID broadcast message is not the first Zone ID broadcast message in step S305 by moving to the zone of the neighboring AP overlapping with the wireless private network terminal, it is determined whether the Zone ID broadcast message is received from the two Zones. S503).

If it is determined in step S503 that the Zone ID broadcast message is received from the two Zones, it is checked whether the wireless private network terminal completely enters the Zone of the neighboring AP and receives only one Zone ID broadcast message (S505). However, if it is determined in step S503 that a Zone ID broadcast message is received from one zone, the wireless private network terminal terminates location recognition.

It is determined whether the Zone ID is changed based on whether the Zone ID of the one Zone ID broadcast message identified in step S505 matches the previous Zone ID (S507).

If it is determined in step S507 that the Zone ID is changed, the changed location information is transmitted to the LBS device (S509), and the wireless private network terminal ends the location recognition.

If it is determined in step S507 that the Zone ID has not been changed, the process returns to step S505.

As such, those skilled in the art will appreciate that the present invention can be implemented in other specific forms without changing the technical spirit or essential features thereof. Therefore, the above-described embodiments are to be understood as illustrative in all respects and not as restrictive. The scope of the present invention is shown by the following claims rather than the detailed description, and all changes or modifications derived from the meaning and scope of the claims and their equivalents should be construed as being included in the scope of the present invention. do.

Accordingly, in the system and method for positioning based on the wireless private network terminal of the present invention as described above, the AP (Access Point) sends a Zone ID broadcast message, and the wireless private network terminal is a Zone ID from the AP (Access Points). By receiving a broadcast message, it is possible to determine which AP the wireless private network terminal is located in by determining whether the wireless private network terminal has entered the zone based on whether it has stayed in the same zone for a predetermined time or more.

Claims (8)

In the terminal positioning system in a multiple wireless private network, A plurality of APs connected to the wireless private network terminal through wireless mobile communication and periodically transmitting Zone ID broadcast messages; A wireless private network terminal capable of wireless communication and receiving a Zone ID broadcast message transmitted from a plurality of APs, determining which AP it is located in, and transmitting to the AP; And And a location based service (LBS) device for receiving and storing location information of the wireless private network terminal from the AP. The method of claim 1, wherein the wireless private network terminal, And determining which AP the mobile station is located in when the same Zone ID is continuously received a plurality of times. The method of claim 1, wherein the wireless private network terminal, Terminal positioning system in a multiple wireless private network, characterized in that it comprises any one of a communication module, such as Bluetooth, UWB, Zigbee. The method of claim 1, wherein the Zone ID broadcast message of the AP, And a transmission frequency information of the Zone ID broadcast message and radio frequency (RF) information of the AP. In the terminal location measurement method in a multiple wireless private network including a plurality of AP, A first step of the plurality of APs periodically transmitting a Zone ID broadcast message; A second step of the wireless private network terminal receiving the Zone ID broadcast message in the Zone of the AP; A third step of determining whether to enter the zone when the wireless private network terminal receives the same Zone ID broadcast message in a plurality of times consecutively in the zone; And If it is determined that the wireless private network terminal has entered the zone, transmitting location information of the wireless private network terminal to a location based service (LBS) device through an AP installed in the zone where the wireless private network terminal is located; Terminal location measurement method in a multiple wireless private network, characterized in that it comprises a step. The method of claim 5, wherein the first step, And transmitting, by the AP, transmission period information and radio frequency (RF) information in the Zone ID broadcast message. The method of claim 5, wherein the determination of whether to enter the zone in the third step, Step 3-1 of determining, by the wireless private network terminal, whether the Zone ID broadcast message received in the Zone is the same as a previous Zone ID broadcast message; If the Zone ID determined in step 3-1 is different from the previous Zone ID, step 3-2 of determining whether the received Zone ID broadcast message is the first Zone ID broadcast message received; If the Zone ID determined in step 3-1 is the same as the previous Zone ID or if the Zone ID broadcast message in step 3-2 is determined to be the first Zone ID broadcast message, the number of reception of the Zone ID broadcast message is counted. Step 3-3; And And step 3-4 of determining whether the count value in step 3-3 is greater than or equal to a specified number to determine that the AP has entered the zone of the AP. How to measure. The method of claim 7, wherein if it is determined that the Zone ID broadcast message in step 3-2 is not the first Zone ID broadcast message, Determining whether a Zone ID broadcast message is received from two Zones; If it is determined in step 3-5 that the zone ID broadcast message is received from the two zones, step 3-6 checking whether the wireless private network terminal completely enters the zone of the neighboring AP and receives only one zone ID broadcast message; Determining whether or not the Zone ID is changed based on whether the Zone ID of the one Zone ID broadcast message identified in steps 3-6 matches the previous Zone ID; And If it is determined in step 3-7 that the Zone ID has been changed, step 3-8 of transferring the changed location information to the LBS device.

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