KR100598149B1 - The method and Apparatus for obtaining location of mobile terminal in repeaters coverage areas - Google Patents

Abstract

A method and apparatus for tracking a location of a mobile station located in a repeater area is disclosed. The mobile station location tracking method of the present invention comprises the steps of: measuring a time delay (first time delay) of the mobile station while the repeater is in a first state; Adjusting a delay time of the repeater to be in a second state; Measuring a time delay (second time delay) of the mobile station while in the second state of the repeater; Comparing the first time delay and the second time delay of the mobile station to determine whether the mobile station is located in the area of the repeater; and if it is determined that the mobile station is located in the repeater area, Calculating a position of the mobile station using the position and the first delay time or the second delay time. According to the present invention, it is possible to identify the exact location of the mobile station in the repeater area, thereby activating a service related to location tracking among mobile communication services.

Mobile communication repeater, W-CDMA, third generation mobile communication, location tracking service, LBS

Description

 The method and Apparatus for obtaining location of mobile terminal in repeaters coverage areas             

BRIEF DESCRIPTION OF THE DRAWINGS In order to better understand the drawings cited in the detailed description of the invention, a brief description of each drawing is provided.

1 is a conceptual diagram illustrating a location tracking method performed based on a base station according to the prior art.

2 is a conceptual diagram illustrating a base station based location tracking method in a repeater area according to the prior art.

3 is a diagram illustrating a base station based mobile station location tracking method according to an embodiment of the present invention.

4 is a flowchart illustrating a mobile station location tracking method according to an embodiment of the present invention.

The present invention relates to a location tracking for a mobile communication mobile station, and to a method and system for tracking the location of a mobile station in a repeater area.

The location tracking of the mobile station is a service that calculates the location of the mobile station in the mobile communication service area and informs the user.

1 is a conceptual diagram illustrating a location tracking method performed based on a base station according to the prior art.

CDMA base station 110 generally uses a method of dividing cells to increase capacity. One base station 110 is typically divided into three sectors. That is, one base station 110 divides into three α sectors, β sectors, and γ sectors to provide mobile communication services.

Accordingly, the base station 110 can determine which sector of the α, β, and γ sectors the signal of the mobile station is coming from, and also how much the signal from the mobile station 120 to the base station 110 is delayed. The distance between the 110 and the mobile station 120 can be measured. That is, the position of the mobile station 120 can be tracked by measuring the delay time τ between the mobile station 120 and the base station 120. With this mechanism, the base station 110 can locate the mobile station 120 using the direction and distance to serve the subscriber.

However, in many cases, a repeater is installed and operated to extend coverage areas or coverage of a mobile communication service.

2 is a conceptual diagram illustrating a base station based location tracking method in a repeater area according to the prior art. Referring to this, one or more repeaters 130 may be connected to one or more sectors of the base station. In the case shown in Figure 2, one repeater 130 is connected to the α sector.

As such, when there is a repeater 130, the conventional base station 110-based location tracking method is difficult to calculate the exact position of the mobile station 120 for the following reasons.

First, the repeater 130 need not be located in the direction of three sectors of the base station. That is, since the repeater 130 is located to remove the shadow area, the position may not be located in three sector directions, and for example, even if the repeater is located at the β sector, the β sector traffic is large. There is a lot of error in tracking the position of the mobile station 120 because it can be connected to the α sector or the γ sector to serve. In addition, a plurality of repeaters may be connected and serviced to each sector of the base station 110, but there is a lot of error in tracking the position of the mobile station because the mobile station 120 does not know which repeater's area. Furthermore, depending on the type of repeater, a time delay (τN of FIG. 2) of the repeater itself may occur, and an error with respect to the position of the mobile station 120 may also occur due to the time delay τN of the repeater.

2 illustrates one case where an error may occur due to the use of a mobile station location tracking method according to the prior art when the mobile station is in the repeater region. Referring to FIG. 2, the repeater 130 is installed in the region of β sector but is connected to the α sector.

Accordingly, the conventional method of tracking the position of the mobile station 120 by considering only the delay time between the mobile station 120 and the base station 110 without determining whether the mobile station 120 belongs to the relay area or, if so, belongs to the relay area. According to the position tracking method according to the technique, the base station 110 has a delay time τ R between the base station 110 and the repeater 130, a delay time τ N inside the repeater, and a delay between the repeater 130 and the mobile station 120. By summing the time [tau] M, it can be estimated that the mobile station 120 is in an 'estimated position' away from D sector by D '. By the way, the mobile station 120 is actually located in an area separated by R from the repeater 130 in the repeater region.

As described above, the method for tracking the position of a mobile station according to the prior art, when one or more repeaters are installed in one base station or one sector, determines whether the mobile station belongs to the repeater region and which repeater region. Difficult to grasp This makes it very difficult to track the location of the mobile station receiving service in the relay area.

An object of the present invention is to identify which repeater mobile station is located in the coverage area of the repeater connected to the base station and to utilize it in the location tracking of the mobile station to reduce the error of the tracking of the mobile station in the repeater installed area It is to provide a location tracking method and apparatus.

According to a preferred aspect of the present invention for achieving the above object, there is provided a method for tracking the position of a mobile station in a repeater area, the time delay (first time delay) of the mobile station being measured while the repeater is in a first state. step; Adjusting a delay time of the repeater to be in a second state; Measuring a time delay (second time delay) of the mobile station while in the second state of the repeater; Comparing the first time delay and the second time delay of the mobile station to determine whether the mobile station is located in the area of the repeater; and if it is determined that the mobile station is located in the repeater area, Provided are a recording medium recording a location tracking method of a mobile station and a program for performing the same, comprising calculating a location of the mobile station using a location and the first delay time or the second delay time.

In a preferred embodiment, the repeater has two or more paths having different delay times, and the step of adjusting the delay time of the repeater to be in the second state includes switching a path of the repeater.

In another preferred embodiment, the step of adjusting the delay time of the repeater to be in the second state includes setting the delay time of the repeater itself.

According to another preferred aspect of the present invention for achieving the above object, in a method for tracking the position of a mobile station in an area where two or more repeaters are installed in one base station, the time delay of the mobile station with all repeaters as a reference state (Hereinafter, referred to as reference delay time); Adjusting a delay time of any one of all repeaters; Measuring a time delay of the mobile station while adjusting the delay time of the repeater; Determining that the mobile station belongs to an area of the repeater if the time delay of the mobile station measured in the state where the delay time of the repeater is adjusted is more than a predetermined reference value compared to the reference delay time; And calculating a position of the mobile station by using the position of the repeater to which the mobile station belongs and the reference delay.

According to another preferred aspect of the present invention for achieving the above object, an apparatus for tracking the position of a mobile station in a repeater area, the time delay (first time delay) of the mobile station while the repeater is in a first state Means for measuring; Means for adjusting the delay time of the repeater to be in a second state; Means for measuring a time delay (second time delay) of the mobile station while in the second state of the repeater; Means for determining whether the mobile station is located in an area of the repeater by comparing a first time delay with a second time delay of the mobile station; and if the determination determines that the mobile station is located in the area of the repeater, A position tracking apparatus for a mobile station is provided that includes a position and means for calculating the position of the mobile station using the first delay time or the second delay time.

In order to fully understand the present invention, the operational advantages of the present invention, and the objects achieved by the practice of the present invention, reference should be made to the accompanying drawings which illustrate preferred embodiments of the present invention and the contents described in the accompanying drawings.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. Like reference numerals in the drawings denote like elements.

3 is a view for explaining a mobile station position tracking method according to an embodiment of the present invention.

Referring to this, the base station 210 is divided into one or more sectors. Each sector may be connected to one or more repeaters. Here, it is assumed that the base station 210 is connected to the three repeaters (310, 320, 330).

The repeaters 310, 320, 330 have two or more paths with different delay times. Preferably, the repeaters 310, 320, 330 have a main path and a diversity path. At this time, the delay times of the main path and the diversity path are different. Alternatively, the repeater 310, 320, 330 preferably includes a device that can optionally set a time delay.

The time delay in the repeaters 310, 320, and 330 may be implemented through the SAW filter. The time delay of the SAW filter may be on the order of several μs (eg, about 2 μs).

The diversity path of the repeaters 310, 320, and 330 converts the reverse signal received from the mobile station into an intermediate frequency (IF) signal and then up-converts the radio frequency (RF) signal through an SAW filter. After converting, the signal is transmitted to the base station 210. At this time, the signal passes through the SAW filter and has a time delay. Alternatively, a delay element may be added to the diversity paths of the repeaters 310, 320, and 330 so as to be different from the main path by a desired delay time. The signal received through the diversity paths of the repeaters 310, 320, and 330 is separated from the Rake receiver of the base station 210 and processed together with the signal of the main path to have a diversity effect.

One embodiment of the present invention is to find out which repeater's service area is located in the service area of the repeater by using the time delay difference between the main path and the diversity path of the repeater, and performs the location tracking of the mobile station. This will be described later in detail.

Base station 210 includes the ability to measure the time delay of base station 210 and mobile station 220. In addition, the base station 210 may control the time delay of each repeater (310, 320, 330). Specifically, with respect to the repeaters 310, 320, 330 having the main path and the diversity path, the base station 210 issues a command to switch the main path and the diversity path of the repeaters 310, 320, 330. , 320, 330 has the ability to get off.

The repeaters 310, 320, 330 switch paths in response to commands from the base station 210.

Referring to Fig. 3, a method for the base station to find out in which relay region a specific mobile station to be located is located is as follows.

As shown in FIG. 3, three first repeaters 310, a second repeater 320, and a third repeater 330 are connected to the base station 210, and if a specific mobile station 220 is connected to the third repeater 330. Suppose you are in a coverage area of.

First, the base station 210 issues a command to each of the repeaters 310, 320, and 330 to turn on the main paths of all the repeaters 310, 320, and 330, and turn off the diversity path. In this state, the base station 210 measures the time delay tau 1 of the signal coming from the particular mobile station 220. The time delay tau 1 at this time is called reference time delay tau 1. Next, for each of the repeaters 310, 320, and 330, the main path is turned off in turn, and the diversity path is turned on, and the time delay of the signal from the specific mobile station 220 is measured. That is, the delay time tau 2 of the mobile station 220 is measured while the main path of the first repeater 310 is turned off and the diversity path is turned on. In addition, the delay time (tau 3) of the mobile station 220 is measured while the main path of the second repeater 320 is turned off and the diversity path is turned on. The delay time tau 4 of 220 is measured.

When the delay time τ2 between the mobile station and the base station is turned off when the main path of the first repeater 310 is turned off and the diversity path is turned on, the specific mobile station 120 is not located in the region of the first repeater 310. There is no difference from the reference time delay tau 1.

The delay time τ3 between the mobile station and the base station with the main path of the second repeater 320 turned off and the diversity path turned on also means that the reference time delay (since the specific mobile station 220 is not at the position of the second repeater 320) There is no difference from τ1). However, when the main path is turned off and the diversity path is turned on for the third repeater 330, the delay time τ4 between the mobile station and the base station is delayed because the specific mobile station 220 is in the service area of the third repeater 330. It is different from (τ1). If the time delay of the diversity path is several [mu] s, the delay time [tau] 4 between the mobile station and the base station is increased by several [mu] s than the reference time delay [tau] 1 because of this time delay of the diversity path. Accordingly, the base station 210 may know that a particular mobile station 220 is in the region of the third repeater 330.

In addition, the base station 210 determines the position of the third repeater 330, the time delay τ R from the third repeater 330 to the base station 210, the time region τ N of the third repeater 330 itself, and the reference time. Considering the delay τ1, it is also possible to analyze how far the specific mobile station 220 is from the third repeater 330. The position, ie direction and distance of each repeater 310, 320, 330 is preferably registered in advance in the base station 210. In addition, it is preferable that the base station knows the delay time? N of each repeater in advance.

As described above, the base station 210 can determine which repeater area the mobile station 120 is located in, thereby reducing errors in location tracking for the mobile station in the repeater coverage area.

Table 1 shows a method of determining which repeater area a specific mobile station to be tracked by the base station belongs to.

Repeater Mobile station's delay time Check position of mobile station Main route: ON Diversity route: OFF Main path: OFF Diversity path: ON First repeater standard No change Impossible A second repeater standard No change Impossible 3rd repeater standard Increased latency by several μs (eg 2 μs) possible

As shown in Table 1, if the delay time of the mobile station before and after switching the repeater path has changed by more than a predetermined range, the mobile station determines that it is in the repeater area. In Table 1, there is no change in the delay time of the mobile station when the path of the first repeater is switched, and there is little change in the delay time of the mobile station even when the path of the second repeater is switched. However, when the path of the third repeater is switched, a difference of several μs occurs in the delay time of the mobile station. Thus, the mobile station is determined to be in the third repeater area.

4 is a flowchart illustrating a mobile station location tracking method according to an embodiment of the present invention. Referring to this, it is possible to find out in which relay the specific mobile station to be located is located by sequentially switching the paths of the repeaters connected to the base station.

First, the base station instructs the main path of one repeater to turn on the diversity path (S410). In this state, the base station measures the delay time of the mobile station (S420). The delay time of the mobile station in this state is referred to as reference delay time tau 1. Next, the base station switches the path of the repeater to the diversity path and specifies the delay time of the mobile station. Specifically, the delay time of the mobile station is measured by turning off the main path of the repeater and turning on the diversity path (S430). At this time, it is preferable that the other repeater is in a state where the main path is turned on. The delay time at this time is referred to as τ2. The base station determines whether τ2 is greater than τ1 (S440). As a result of the determination, if tau 2 is not greater than tau 1 and both are substantially the same, the base station determines that the mobile station is not in the repeater. Then, it is checked whether there is another repeater that does not switch the path (S450), and targets another repeater (S455), and repeats the processes (S410 to S440). That is, the delay time (τ1) of the mobile station is measured by turning on the main path and turning off the diversity path (S410, S420) for another repeater. Then, the delay time of the mobile station is turned off by turning off the main path and turning on the diversity path. After measuring τ2 (S430), it is again determined whether τ2 is greater than τ1 (S440). If τ2 is greater than τ1, the base station determines that the mobile station is in the repeater. Then, the base station tracks the position of the target mobile station in consideration of the position of the repeater and the delay time of the mobile station. The delay time of the mobile station used for tracking the position of the mobile station is preferably the delay time tau 1 when the main path is on and the diversity is off. However, since the base station knows the delay time of the diversity path, the delay time tau 2 when the main path is off and the diversity is on may be used. If the paths of all the repeaters have been switched, and the difference in the delay time? 1 and? 2 does not occur, then the mobile station is unlikely to belong to any repeater. In this case, the base station may track the location of the mobile station in consideration of the reference delay time tau 1 of the mobile station (S470).

In step S440 of FIG. 4, the base station determines whether τ2 is greater than τ1, but may determine whether τ2 is greater than or equal to τ1 by setting a predetermined comparison value.

If the repeater has more than one path (ie, main path and diversity path) and there is a time difference between the two paths, the location of the mobile station is tracked using the time difference between the main path and the diversity path. On the other hand, for the digitized repeater, the time delay of the repeater itself can be controlled by adjusting the speed of the line buffer memory and the reference clock of the repeater. In this case, it is possible to determine whether the target mobile station is in the repeater area by measuring and comparing the delay time of the mobile station by adjusting the time of the repeater itself.

In the case of such a digital repeater, first of all, the base station measures the time delay of a signal for a specific mobile station 220, and then sequentially measures the delay time of the mobile station while adjusting the time delay of the repeater. If the delay time of the mobile station measured while the time delay of the specific repeater is adjusted is different from the delay time of the mobile station measured before the delay time adjustment, the mobile station may determine that it is in the repeater region. The base station can then determine which repeater's location is in the area covered by the repeater, and as described above, considering the delay time of the signal from the repeater to the base station, its own delay time and the reference time delay, You can also see how far you are, so you can determine the location of a particular mobile station.

According to the present invention, it is possible to identify the exact location of the mobile station in the repeater area, thereby activating the service related to location tracking among the mobile communication services, and also in the service related to the disaster prevention in relation to the disaster. This helps to ensure agility in emergency situations. In particular, in the W-CDMA service, which is the third generation mobile communication service, the location tracking service is defined as a basic service, and it can contribute to the activation of the third generation mobile communication service.

Claims (8)

A method of tracking the location of a mobile station in a repeater area, (a) measuring a time delay (first time delay) of the mobile station while the repeater has a preset reference delay time; (b) adjusting a delay time of the repeater; (c) measuring a time delay (second time delay) of the mobile station under an adjusted delay time condition of the repeater; (d) comparing the first time delay and the second time delay of the mobile station to determine whether the mobile station is located in the area of the repeater: and (e) if it is determined that the mobile station is located in the repeater region, calculating the position of the mobile station using the position of the repeater and the first delay time or the second delay time. Location tracking method. The method of claim 1, And the repeater has two or more paths having different delay times, and the step (b) switches the paths of the repeater. The method of claim 1, In step (b), the delay time of the repeater itself is adjusted by adjusting the speeds of the line buffer memory and the reference clock. A method for tracking the location of a mobile station in an area where two or more repeaters are installed in one base station, (a) measuring a time delay (hereinafter, referred to as a reference delay time) of the mobile station with all repeaters having a preset reference delay time; (b) adjusting a delay time of at least one repeater selected from all repeaters; (c) measuring a time delay of the mobile station under an adjusted delay time condition of the selected repeater; (d) determining whether the measured time delay of the mobile station is greater than or equal to a predetermined reference value compared to the reference delay time; And (e) calculating a position of the mobile station using the position of the selected repeater and the reference delay time when the measured time delay of the mobile station is different from the reference delay time by more than a predetermined reference value. How to track your location. The method of claim 4, wherein Step (b) is characterized in that the switching of the main path and the diversity path of the selected repeater. The method of claim 4, wherein In step (b), the delay time of the repeater itself is adjusted by adjusting the speeds of the line buffer memory and the reference clock. A program of instructions that can be executed by a digital processing apparatus is tangibly implemented to perform the mobile station position tracking method according to any one of claims 1 to 6, and records a program that can be read by the digital processing apparatus. Record carrier. A device for tracking the location of a mobile station in a repeater area, Means for measuring a time delay (first time delay) of the mobile station with the repeater having a preset reference delay time; Means for adjusting a delay time of the repeater; Means for measuring a time delay (second time delay) of the mobile station under an adjusted delay time condition of the repeater; Means for comparing the first time delay and the second time delay of the mobile station to determine whether the mobile station is located in an area of the repeater: and And if it is determined that the mobile station is located in the repeater region, means for calculating the position of the mobile station using the position of the repeater and the first delay time or the second delay time. .

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