KR20030060195A - Method for measuring the position of the mobile telephone in the mobile communication system - Google Patents

Abstract

The present invention provides a method for measuring the position of a mobile terminal in a mobile communication system, the process of the base station controller to change the threshold value of the pilot signal transmitted to the mobile terminal through a base station to change the position of the mobile terminal; The mobile station transmits pilot phase information and pilot strength information of a neighbor base station in an active set to a base station through a pilot strength measurement message due to the threshold value of the changed pilot signal, and the base station performs round trip with the pilot strength measurement message. Transmitting delay time information to the base station controller, and the base station controller propagates the pilot phase information, the pilot strength information, and the round trip delay time information received from the base station through a pilot strength measurement message for a position response; Mobile exchange via measurement message And the mobile switching unit transmits the pilot phase information, the pilot strength information, and the round trip delay time information to a positioning entity through an inter-system location response message. The pilot strength information and the round trip delay time information are transmitted to a mobile positioning center, and the mobile positioning center determines the position of the mobile terminal using a specific positioning method, and uses the pilot phase information and the round trip delay time information. And measuring the position by correcting the error.

Description

METHOD FOR MEASURING THE POSITION OF THE MOBILE TELEPHONE IN THE MOBILE COMMUNICATION SYSTEM}

The present invention relates to a location information service of a mobile communication system, and more particularly to a method for measuring the location of a mobile terminal.

In general, positioning methods for measuring the position of a mobile station (MS) include AOA (Angle of Arrival), TDOA (Time Difference of Arrival) and TOA (Time of Arrival).

In the AOA method, two base transceiver stations (BTSs) measure the direction of a signal coming from a mobile terminal to obtain an azimuth angle, and measure a position using the azimuth angle. In addition, the TDOA method determines a location using a time difference of arrival of signals transmitted from different places. A propagation time difference proportional to the difference in distance from two base stations to a mobile terminal is measured, and the mobile terminal is positioned on a hyperbolic line having a constant distance difference at the two base stations, that is, the two base stations. Two hyperbolas are obtained from three base stations, and the intersection of the two hyperbolas becomes the position of the mobile terminal.

The TOA method is a method of obtaining a distance by measuring a propagation time between a mobile terminal and a base station, and a GPS (Global Positioning System) satellite measures the position of the mobile terminal using the TOA method.

1 is a block diagram showing a position measuring method of a mobile terminal according to an embodiment of the prior art. The TOA method will be described with reference to FIG. 1. Here, the base station may be three or more, but the following description assumes three base stations.

Referring to FIG. 1, there are three base stations of base station 1 121, base station 2 123, and base station 3 125. The mobile terminal 127 is located at the intersection of the three base station ranges. Basically, in the TOA method, the three base stations and the mobile terminal 127 must all keep accurate synchronization, and the three base stations must know the time of the signal originating from the mobile terminal 127. In particular, in the case of a system using GPS satellites, a cyclic least square method is used to determine the absolute position based on the measured value and to calculate the minimum value and process the measured result.

In the case of the TOA method, when a distance between a mobile terminal and a base station is obtained, a signal enters a receiver in a multi-path from a GPS satellite, and the difference in path length may affect pseudo range and phase observation. have.

In addition, when a mobile terminal suddenly transmits an impulse power (Impulse Power) to the base station to inform the position of the mobile terminal in the mobile communication system, the call of the mobile terminal in the call may be interrupted due to the influence on the mobile communication system There is this.

In addition, in a method of measuring a location using a GPS satellite, when a crowded area of a metropolitan building, a basement, or a weather worsen, the mobile terminal may not receive the GPS satellite signal and may not be able to measure the location. The problem is that software must be added.

Accordingly, an object of the present invention is to provide a method for measuring the position of a mobile terminal in a mobile communication system.

The present invention for achieving the above object, in the method for measuring the position of the mobile terminal in a mobile communication system, in order to measure the position of the mobile terminal, the base station controller changes the threshold value of the pilot signal through the base station Transmitting the pilot phase information and the pilot strength information of the neighbor base stations in the active set to the base station through a pilot strength measurement message due to the threshold value of the changed pilot signal; (B) transmitting the pilot strength measurement message and the round trip delay time information to the base station controller; and the base station controller receiving the pilot phase information, the pilot strength information, and the round trip delay received from the base station through a pilot strength measurement message. Propagation of time information for location response And transmitting the pilot phase information, the pilot strength information, and the round trip delay time information to a positioning entity through a position response message between systems, and the positioning entity. Transmits the pilot phase information, the pilot strength information, and the round trip delay time information to a mobile positioning center, and the mobile positioning center determines the position of the mobile terminal by using a specific positioning method. And measuring the position by correcting the error using the round trip delay time information.

1 is a block diagram showing a position measuring method of a mobile terminal according to an embodiment of the prior art.

2 is a block diagram showing a schematic configuration of a mobile communication system for performing a function in an embodiment of the present invention.

3 is a flowchart illustrating a process of measuring the position of a mobile terminal according to an embodiment of the present invention.

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

2 is a block diagram showing a schematic configuration of a mobile communication system for performing a function in an embodiment of the present invention. Although the base station is represented by the base station 1 (107), base station 2 (111), base station 3 (113), three or more base stations are possible. In the present invention, the base station 1 (107) is a mobile terminal 109 and the base station controller 105 Assume that you are working in conjunction with

Referring to FIG. 2, a Position Determination Entity (PDE) 101 requests location information of a mobile terminal, collects the location information, and calculates the location information. Also, a mobile positioning center (MPC) 102 performs the same function as the positioning entity PDE and displays the position information.

Mobile Switching Center (MSC) 103 is an automatic system for configuring an access point for user traffic between a mobile communication network and another mobile switching network in a general telephone network or in the same or another mobile communication network. An exchange that provides circuit switched services to telecommunication subscribers.

A base station controller (BSC) 105 is located between a base transceiver station (BTS1) 107 and the mobile switch 103 to allocate and release radio channels for the mobile station 109. And a function of controlling transmission outputs of the mobile terminal 109 and the base station 1 107, and determining soft hand-off and hard hand-off between cells. Perform operation and maintenance functions for

The base station 1 107 is a network terminator directly connected to the mobile terminal 109 by performing baseband signal processing, wired / wireless change, and transmission / reception of a radio signal, and a tower and an antenna necessary for connecting wireless communication devices to a network. , Wireless equipment and the like.

The mobile station (MS) 109 performs radio channel signal strength and quality measurement, radio signal demodulation and transmission and reception, power control, call processing, and additional service processing.

The configuration diagram of FIG. 2 has been described so far. Next, a process of measuring the position of a mobile terminal in a mobile communication system will be described.

3 is a flowchart illustrating a process of measuring the position of a mobile terminal according to an embodiment of the present invention. In FIG. 3, the base station is represented by the base station 1 107, the base station 2 111, and the base station 3 113, but three or more base stations are possible. In the present invention, the base station 1 107 is a mobile terminal 109 and a base station. Assume that it is operating in connection with the controller 105.

This will be described with reference to FIGS. 2 and 3.

The positioning entity 101 transmits an inter-system location request (ISPOSREQ) message to the mobile switch 103 to collect the location information of the mobile terminal 109. The inter-system location request (ISPOSREQ (input)) message may be represented by a parameter as shown in Table 1 as an example.

The mobile switch 103 transmits a radio measurement for position request (RMP) message to the base station controller 105. Radio wave measurement (RMP) messages for the location request are shown in Table 2 as an example. In addition, the internal size of the radio wave measurement message for the location request is shown in Table 3 as an example.

Referring to Table 2 and Table 3, a pilot strength measurement message (PSMM) is a message provided by the mobile terminal 109, and information included in the pilot strength measurement message (PSMM) includes a pilot phase ( PILOT_PN_PHASE) and pilot strength (PILOT_STRENGTH) information. Information for synchronizing is defined as pilot phase (PILOT_PN_PHASE) information, and information representing the strength of the pilot signal is defined as pilot strength (PILOT_STRENGTH) information. In addition, a Base Station Management Application Protocol (BSMAP) message is a message sent from the mobile switching center 103 to the base station 1 107, and accumulated in association with the mobile terminal 109 on a traffic channel. A message requesting the geographic location information of the radio interface measured or determined.

In the present invention, the base station controller 105 changes the threshold value of the pilot signal, and temporarily changes the low value from -14 dB to -30 dB, for example, and transmits it to the mobile terminal 109 through the base station 1 107.

The base station controller 105 temporarily changes the threshold of the pilot signal to a low level for transmission as follows. When the threshold value of the pilot signal is temporarily changed and transmitted, the base station controller 105 obtains pilot phase information and pilot strength information of neighboring base stations in the active set of the mobile terminal 109. That is, the threshold of the pilot signal transmitted to the mobile terminal 109 is not actually lowered. The base station controller 105 temporarily lowers the threshold value of the pilot signal and transmits the pilot signal to the mobile station 109, thereby transmitting the pilot phase information and the pilot strength information of the neighbor base stations in the active set of the mobile station 109. Is to get.

When the mobile station 109 detects a threshold of a pilot signal that is temporarily lowered, a pilot strength measurement message (PSMM) is applied to the pilot phase information and the pilot strength information of a neighbor base station in an active set of the mobile station 109. It transmits to the base station1 (107) through. The base station 1 107 transmits the pilot strength measurement message (PSMM) to the base station controller 105, the strength measurement message (PSMM) of the pilot signal is shown in Table 4.

In addition, the base station 1 107 transmits round trip delay time (RTD) information to the base station controller 105 through the base station 1 107. The round trip delay time (RTD) information is information indicating a time taken for a signal to round trip from the base station 1 107 to the mobile terminal 109 and from the mobile terminal 109 back to the base station 1 107.

The base station controller 105 receives the pilot strength measurement message (PSMM) from the base station 1 107 but does not perform handoff.

In general, the mobile terminal 109 has a threshold value of a pilot signal as a reference to perform handoff. If the mobile terminal 109 is a threshold value of the pilot signal as a reference, for example, -14 dB, the mobile terminal 109 approaches the base station 1 (107) from the base station 1 (107), and the base station 1 ( 107, the strength of the incoming pilot signal is low, and the base station 2 (111) is the strength of the pilot signal is high. When the strength of the pilot signal of the base station 1 107 is lowered, for example, when it is lowered from -14 dB to -30 dB, the mobile terminal 109 is the strength of the pilot signal of the neighbor base stations in the active set (Active Set) Information is transmitted to the BS1 107 through a pilot strength measurement message (PSMM). The base station 1 107 transmits the pilot strength measurement message (PSMM) to the base station controller 105. The base station controller 105 performs a handoff using the pilot strength measurement message (PSMM).

However, in the present invention, the base station controller 105 is the air termination call control (ACC) block of the Air Termination Processor (ATP) by changing the threshold value of the pilot signal to the base station 1 Transmitted to the mobile terminal 109 via the 105. When the air termination call control (ACC) changes the threshold value of the pilot signal, when the pilot strength measurement message (PSMM) is transmitted from the mobile terminal 109 through the base station 1 107, a task (Task) Do not perform handoff through management.

The air termination call control (ATP) processes a signal received together with traffic data such as a handoff signal and a power control signal after a call is established, and a radio link protocol (RLP) and a selective donation unit (RLP) for the data call. SRU: Selection & Distribution Unit. In addition, when the air termination call control (ACC) processes the call of the base station controller 105, the air termination call control (ACC) processes a given signal message between the mobile terminal 109 and the base station controller 105 in the call state, and sets up or releases the call. In this case, specific calls, such as resource control and hand-off control, are controlled.

Table 5 shows Radio Measurement for Position Resoponse Element messages. Table 5 shows an information element, a section reference, an element direction, and a type.

Referring to Table 5, the base station controller 105 transmits the round trip delay time (RTD) information to the mobile switch 103 through a configuration such as "CDMA Serving One Way Delay". An internal configuration of the “CDMA Serving One Way Delay” is shown in Table 6 as an example. In addition, the internal configuration of the "Downlink Radio Environment List" of Table 5 is shown in Table 7 as an example.

In addition, the base station controller 105, in the pilot strength measurement message (PSMM) received from the base station 1 (107), the pilot phase information and the pilot strength information has a configuration such as "Downlink Radio Environment List" in Table 5 above. It transmits to the mobile exchange 103 through. The pilot phase information of the "Downlink Radio Environment List" is transmitted to the mobile switch 103 through a configuration such as "CDMA Target One Way Delay" of Table 7, and the pilot strength information is "Downlink" of Table 7 Signal strength raw "is transmitted to the mobile switch 103 through a configuration such as.

The mobile switching unit (103) inter-system position request invokes the round trip delay time (RTD) information, the pilot phase information, and the pilot strength information received from the base station controller 105 (ISPOSREQ). Message) and send it to the positioning entity (101).

The positioning entity 101 uses various methods, for example, a time difference of arrival (TDOA) method for determining a location using a time difference of arrival of signals transmitted from different places to calculate the collected location information. The position of the mobile terminal 109 is measured by correcting the error using the round trip delay time (RTD) information and the pilot phase information. In addition, the mobile positioning center 102 performs the same function as the positioning entity PDE and displays the location information of the mobile terminal 109.

Meanwhile, in the detailed description of the present invention, specific embodiments have been described, but various modifications are possible without departing from the scope of the present invention. Therefore, the scope of the present invention should not be limited to the described embodiments, but should be defined not only by the scope of the following claims, but also by the equivalents of the claims.

According to the present invention as described above, since the position information of the mobile terminal can be known by temporarily changing the threshold value of the pilot signal and transmitting it to the mobile terminal, the location information service is provided only by changing the software without additional hardware. The advantage is that you can.

Claims (1)

In the method for measuring the position of the mobile terminal in a mobile communication system, When the request message for the position measurement of the positioning entity is detected, the base station controller changes the threshold value of the pilot signal and transmits to the mobile terminal through the first base station that is currently performing a communication service for the mobile terminal; , The mobile terminal receiving the changed pilot signal threshold value changes the currently set pilot signal threshold value to the received pilot signal threshold value, and then measures pilot phase information and pilot strength information of neighboring base stations belonging to the active set. Transmitting the measured pilot phase and intensity information to the first base station; Receiving, by the base station, the pilot phase and strength information, transmitting round trip delay time information and the pilot phase and strength information of the mobile terminal to the location entity through the base station controller; The positioning entity that has received the pilot phase and strength information and the round trip delay time information estimates the position of the mobile terminal in a time difference method based on the pilot phase information and the strength information, and estimates the estimated mobile terminal position. The method comprising the step of correcting with the round trip delay time information.