KR20050070181A - Terminal position measuring device of the base-station of the umts using a single cell and controlling method therefore - Google Patents

Abstract

The present invention uses a terminal positioning signal transmission step of transmitting a specific signal necessary for position estimation from a terminal to a base station by a terminal of a UMTS, and using the two array antennas for receiving a position estimation signal transmitted from the terminal after the terminal positioning signal transmission step. The position estimation signal base station receiving step of receiving the phase mode pulse method, and after the position estimation signal base station receiving step, the base station synchronizes each received signal received through the two antennas using a PN code, and then delay time and incident angle. The terminal of the base station of the UMS using a single cell consisting of a delay time and the incident angle calculation step of calculating the step and the terminal location calculation step of calculating the position of the terminal using the delay time and the incident angle information after the delay time and the incident angle calculation step Provided are a position estimation device and a control method thereof.

In the present invention as described above by using the distance information between the terminal and the base station using only one base station and simultaneously calculating the incident angle of the terminal signal reaching the base station using the phase monopulse method, and using the result to calculate the position of the terminal, Since the occurrence of the mutual (hearability) between the plurality of base stations does not occur, the accuracy of the location estimation of the terminal is significantly improved accordingly.

Description

Terminal position measuring device of the base-station of the UMTS using a single cell and controlling method therefore}

The present invention relates to an apparatus for estimating a terminal position of a base station of a UE using a single cell and a method of controlling the same. Particularly, a single base station is used to reach a base station using distance information and a phase monopulse method between the terminal and the base station. The present invention relates to a terminal location estimating apparatus for a base station of a UMS using a single cell that simultaneously calculates an incident angle of a terminal signal and uses the result to calculate a terminal location.

In general, mobile communication systems, in particular, in the early 1980s, divided the service area into hexagonal cells of several km to several ten kilometers in diameter in North America, and then repeatedly used the same frequency channel in geographically separated cells. The rapid growth of the cellular-phone mobile communication system, which implements the radio channel switching function between cells according to the movement of, has grown rapidly. In addition, recently, a third generation mobile communication system called IMT-2000 has been developed and used. Such a system can be used for various communication services supported by a fixed communication network such as PSTN / ISDN / B-ISDN, etc. A mobile communication system that enables access to an information service network including audio and video data using a wireless link. However, in such an IMT-2000 system, wireless positioning must be performed to maintain a call channel with a terminal. Such wireless positioning can be classified into a method using a GPS and a method that is not. Looking only at the method of positioning, for example, cell id method, cell id + RTT method, OTDOA method, AOA method, TDOA method may be mentioned.

The cell id method uses coordinates of a cell registered in a user equipment (UE), and the cell id + RTT method obtains an uncertainty coordinate of the UE using RTT (ROUND TRIP TIME), which is a propagation time to the UE. It is a way to approximate the position of.

Then, referring to FIG. 1, the structure of the mobile communication system for the position estimation of the conventional terminal as described above, in order to process the propagation time and propagation speed information for the position estimation transmitted and received from the mobile terminal 70 A base station system (Node-B) 71A-N configured in a network form, a base station controller (RNC) for controlling the functions of the plurality of base station system units 71A-N, and the plurality of And a core network (73) for controlling the terminal position estimation function by managing the node-B 71A-N and the RNC 72A-N in the form of a node element (NE).

On the other hand, the conventional method for estimating the location of the base station of UMTS as described above, first, when the terminal 70 performs the setup, the location registration procedure to the neighbor base station system unit 71, the core network 73 is the base station system The parts 71A-N continue to emit the paging signal for synchronization. Then, the terminal 70 configures a radio link in response to the paging signal emitted from the base station system unit 71A-N, wherein at least three base station systems adjacent to the terminal 70 are located. The unit 71A-N is a radio wave propagation time between the terminal 70 and the adjacent base station system unit 71A-N in accordance with the radio positioning control signal indicated by the core network 73 via the corresponding RNC 72A-N. And using the propagation speed information, etc., grasp the current position of the terminal 70 and report it to the core network 73. When the position of the terminal 70 is determined by the radio positioning method as described above, a normal mobile communication call processing operation is executed.

However, the conventional method of estimating the location of a base station of UMTS as described above requires receiving downlink signals from multiple cells, i.e., at least three neighboring base station system units, between the mobile terminal and the neighboring base station by a near-far phenomenon and power control. Since the transmission and reception of signals were very difficult, the ability to hear continuously occurred, and even if the IPDL method restricted by the 3GPP spec was used to solve this problem, the position estimation error was not found in the ideal channel environment such as the line of sight. There was a problem that it is difficult to accurately estimate the location of the terminal because it is represented by more than a valid information value.

Accordingly, the present invention has been invented to solve the conventional problems as described above, and since the location of the terminal can be estimated using only one base station, a plurality of base station equipment for radio positioning is unnecessary, and thus the position of the terminal An object of the present invention is to provide an apparatus for estimating a terminal position of a base station of a UE using a single cell and a control method thereof that can significantly reduce the estimated cost.

Another object of the present invention is to perform the position estimation of the terminal using only one base station, so that the occurrence of the mutual (hearability) that can occur between a plurality of base stations does not occur, therefore the accuracy of the position estimation of the terminal is also considerably increased. The present invention provides an apparatus for estimating a terminal position of a base station of a UE using an improved single cell, and a control method thereof.

The present invention for achieving the above object in the location tracking device of the UMTS to track the location of the terminal to perform the call processing,

Orthogonal synchronization processing unit for demodulating and demodulating the signal of the terminal carried on the orthogonal carrier of the two antennas arranged to have a constant reception angle by the in-phase PN code, and the two antennas arranged to have the constant reception angle In-phase synchronization processing unit for demodulating and demodulating the signal of the terminal carried on the phase carrier to the in-phase PN code, and code acquisition and code tracking from the signal processed by the orthogonal synchronization processing unit and the in-phase synchronization processing unit to synchronize Phase delay value And two received angles from a signal processed by the orthogonal synchronization processor and the in-phase synchronization processor. And an angle evaluation unit for calculating the delay value of the correction unit ) And the calculated value of the angle evaluation unit ( Provided is a terminal location estimation apparatus for a base station of a UMS using a single cell including a base station having a location calculation unit that finally calculates the location of the terminal using a).

Another feature of the present invention is a terminal positioning signal transmission step of transmitting a specific signal necessary for position estimation in a terminal to a base station in the terminal, and the position estimation signal transmitted from the terminal after the terminal positioning signal transmission step is arranged for receiving two Position estimation signal base station receiving step of receiving by phase mode pulse method using antenna, and after receiving position estimation signal base station receiving step, base station synchronizes each received signal received through two antennas using PN code and then delays The delay time and the incident angle calculating step of calculating the time and the incident angle, and the terminal position calculation step of calculating the position of the terminal using the delay time and the incident angle information after the delay time and the incident angle calculating step Provided is a control method of a terminal location estimation device of a base station.

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

As shown in FIG. 2, the apparatus of the present invention connects the base station 2 to form a call by performing one-to-one positioning with the terminal 1 in its sector area, and is connected to the base station 1 to provide a positioning function. And the RNC 3 for managing base stations and outputting the processed transmission data in the form of IPOA TCP / IP, and controlling the positioning function of the terminal 1 to be processed one-to-one with only one base station 2. The core network 4 manages the location registration procedure of the terminal 1 and receives and processes the packet data of the RNC 3 connected in the NE form.

In addition, the base station 1 demodulates a signal of a terminal carried on an orthogonal carrier among two antennas 5A-B arranged to have a predetermined reception angle as shown in FIG. Orthogonal synchronization processing section 6 for processing and demodulating signals of in-phase PN codes by demodulating the signals of terminals transmitted on in-phase carriers of two antennas 5A-B arranged to have a predetermined reception angle; Code acquisition and code tracking are performed on the signals processed by the phase synchronization processing unit 7 and the orthogonal synchronization processing unit 6 and the in-phase synchronization processing unit 7 to synchronize the phase delay value ( 2 received angles from the signals processed by the correction unit 8 and the orthogonal synchronization processing unit 6 and the in-phase synchronization processing unit 7 The delay value of the angle evaluation unit 9 and the correction unit 8 for calculating ) And the calculated value of the angle evaluator 9 It is provided with a position calculation unit 10 for finally calculating the position of the terminal by using a).

In order to estimate the position of the terminal using only one base station in the W-CDMA network, the distance between the terminal and the base station and the incident angle of the terminal signal reaching the base station must be simultaneously measured. In this case, the distance between the terminal and the base station It can be measured through the synchronization process of the received PN code. In addition, the W-CDMA system may be connected to multiple users using PN (Pseudo Noise) code. In practice, the W-CDMA system measures the distance from the base station to the terminal through a technique called Round Trip Time (RTT).

In order to measure the incident angle, only two array antennas are used per cell, and a table mono-pulse method that uses a table look-up method to significantly reduce the computational load is used.

In addition, the mono pulse was used to form a plurality of beams at the same time, to compare the magnitude of the signal reflected on the target, and to estimate the direction of the target at one time. In the base station of the W-CDMA position estimation system using the phase mono pulse, one cell has only two receiving array antennas.

Next, the location estimation method of the base station system as described above will be described in detail.

As shown in FIG. 4, the method of the present invention proceeds to the terminal positioning signal transmission step S2 in the initial state S1 and transmits a specific signal necessary for position estimation in the terminal to the base station.

That is, the terminal 1 transmits the uplink signal of 3GPP spec 25.213 to the base station 1 by separating the in-phase channel and the quadrature channel. Wow Is Represents a k-phase user's in-phase and quadrature binary data strings, composed of unit amplitude pulses over a period of time At this time, the and Denotes the m-th data of the k-th user of the in-phase channel and the quadrature phase channel, and is represented by -1 and 1 only. Each data is spread by a unique PN code of each user, and then modulated by a carrier as shown in Equations (1) and (2) below.

Here, the spreading codes of the following formulas (3) to (6) Periodic binary signal sequence consisting of unit amplitude pulses for a period, representing channelization and scrambling codes used for in-phase and quadrature channels.

On the other hand, the terminal 1 transmits a signal using the in-phase channel of the terminal for analysis of the W-CDMA base station receiver. here to be.

For example, when the location estimation signal is transmitted from the terminal of the k-th user, a signal as shown in Equation (7) is transmitted.

Where Is the carrier frequency, Is the phase offset of the k-th user.

On the other hand, after the terminal positioning signal transmission step (S2) proceeds to the position estimation signal base station reception step (S3) to receive the position estimation signal transmitted from the terminal using a phase mode pulse method using the two array array antennas.

That is, in a W-CDMA position estimation system using a phase mono pulse using the method of the present invention, one cell of the base station has only two receiving array antennas. As shown in Figure 1, the two receive antennas Are arranged at intervals.

here Represents the wavelength of the carrier wave. In order to explain the process of finding the angle of incidence of a signal by applying a phase monopulse technique in a W-CDMA system, only the in-phase channel information of the transmitter is considered and the signals received by the two array antennas Let's say Binary Data Strings on In-Phase Channels Assuming that all are 1 and there is no change in the channel, the signals received in the system of Fig. 2 are represented by Equation (8).

Here, the position estimation signal received by the antennas 5A-B of the base station 1 Since the frequency of the carrier is much larger than that of the carrier, the signal received by the second antenna has a delay of only the carrier with respect to the signal received by the first array antenna.

In addition, after the location estimation signal base station reception step S3, the delay time and the incident angle calculation step S4 are performed, and the base station synchronizes each of the received signals received through the two antennas using the PN code, and then the delay time. Calculate the incident angle. After the delay time and the incident angle calculating step S4, the terminal position calculation step S5 is performed to calculate the position of the terminal using the delay time and the incident angle information.

That is, since the degree of the received signal delay is ultimately determined by the angle of incidence of the signals received by the two antennas 5A-B, if only the phase difference related to the delay of the signals received by the two array antennas can be estimated, The angle of incidence of the signal source being transmitted can be determined.

Therefore, the quadrature synchronization processor 6 and the in-phase synchronization processor 7 of the base station 1 are demodulated by the in-phase PN code after demodulating the signals received by the in-phase carrier and the quadrature carrier, respectively.

Here, the in-phase PN code is executed by the base station 1 by a synchronization process through code acquisition and code tracking.

This process allows the first antenna to output In the second antenna Get

Since only the in-phase channel information of the transmitter is considered in the above process, it is assumed that there is no orthogonal phase channel information of the transmitter. However, the same result can be obtained by considering the quadrature phase channel information of the transmitter at the same time. The relationship between the incidence angle and the output value by the phase mono pulse theory is shown in Equation (9).

The output to the equation (9) By substituting, the relationship as shown in equation (10) is established between the incident angle of the signal and the mono pulse output value.

In the above process, assuming the ideal channel pass of the transmission signal and the despreading of the code completely synchronized, the output at each stage is expressed by Equation (11).

      In Equation (11), G is the length of the matched filter used for code acquisition. In addition, substituting the values of the equation (11) into the equation (10) is arranged as in the equation (12).

The distance d between the array antennas of the base station 1 is If is equal to the delay time Angle of incidence Has the same relationship as Equation (13) below.

That is, calculated by the correction unit 8 in the two array antennas of the base station 1 Is calculated by the angle evaluator 9 And the angle of incidence between the received signal and the array antenna The angle of incidence can be measured from the output value of the phase mono pulse.

Since the incident angle and the output value have a proportional relationship in the above process, Equation (12) can be summarized as shown in Equation (14) below, and FIG. 5 shows the relationship between the incident angle and the output value.

In actual mobile communication channels, however, noise, multipath interference, and error in code synchronization cause differences in the output value of the ideal channel.

Therefore, the position calculation unit 10 of the base station 1 according to the present invention corresponds to a value that generates the slightest error through comparison between the table made using Equation (14) and the phase mono pulse output value of the actually received signal. The angle to be determined is determined as the incident angle.

In other words, through the code acquisition and code tracking process of the mobile station signal received at the first array antenna of the base station 1 of the present invention, the distance between the terminal 1 and the base station 1 is determined, and the synchronized code is obtained. By using the phase monopulse method to determine the incidence angle of the signal with respect to the signal coming into the first and second array antenna, the position of the terminal can be estimated from the distance and direction information. The base station 1 then reports the current position of the terminal 1 calculated by the method of the present invention to the core network 4 via the RNC 3.

As described above, the present invention calculates the incident angle of the terminal signal reaching the base station by using the distance information between the terminal and the base station and the phase monopulse method using only one base station, and calculates the position of the terminal using the result. Therefore, since the location of the terminal can be estimated using only one base station, a plurality of base station equipment for radio positioning is unnecessary, and thus, the location estimation cost of the terminal can be significantly reduced.

In addition, according to the present invention, since the position estimation of the terminal is performed using only one base station, since the occurrence of a hearing phenomenon that can occur mutually between a plurality of base stations does not occur, the accuracy of the position estimation of the terminal is accordingly increased. There is also a significant improvement.

1 is an explanatory diagram illustrating a location tracking method of a base station of a conventional UMTS.

2 is an explanatory diagram for explaining an apparatus of the present invention.

3 is an explanatory diagram illustrating a detailed configuration of a base station apparatus of the present invention.

4 is a flowchart of the present invention.

5 is a graph of the angle of incidence and output in an ideal channel for position tracking.

<Detailed Description of Codes>

1 terminal 2 base station

3: RNC 4: core network

5A-B: Antenna 6: Orthogonal Synchronization Processing Unit

7: In-phase synchronization processing unit 8: Correction unit

9: angle evaluation unit 10: position calculation unit

Claims (8)

In the location tracking device of the UMTS that tracks the location of the terminal to perform call processing, Orthogonal synchronization processing unit for demodulating and demodulating the signal of the terminal carried on the orthogonal carrier of the two antennas arranged to have a constant reception angle by the in-phase PN code, and the two antennas arranged to have the constant reception angle In-phase synchronization processing unit for demodulating and demodulating the signal of the terminal carried on the phase carrier to the in-phase PN code, and code acquisition and code tracking from the signal processed by the orthogonal synchronization processing unit and the in-phase synchronization processing unit to synchronize Phase delay value And two received angles from a signal processed by the orthogonal synchronization processor and the in-phase synchronization processor. And an angle evaluation unit for calculating the delay value of the correction unit ) And the calculated value of the angle evaluation unit ( And a base station having a position calculating unit which finally calculates the position of the terminal using a single cell. The apparatus of claim 1, wherein the incident angle calculation unit of the angle evaluator is calculated by using a phase mono pulse method using only two array antennas per cell. A terminal positioning signal transmission step in which a terminal of UMTS transmits a specific signal required for position estimation in a terminal to a base station, and a phase mode using two array antennas for position estimation signals transmitted from the terminal after the terminal positioning signal transmission step. After the position estimation signal base station reception step of receiving the pulse method and the position estimation signal base station reception step, the base station synchronizes each received signal received through the two antennas using the PN code and then calculates the delay time and the incident angle. The delay time and the incident angle calculation step, and after the delay time and the incident angle calculation step of calculating the position of the terminal using the delay time and the incident angle information of the base station of the UE using a single cell Control method of terminal position estimator. The signal transmitted by the terminal during the terminal positioning signal transmission step is represented by the following equation. Where Is the carrier frequency, Is a signal calculated by a phase offset of the k-th user, the control method of the terminal location estimation apparatus of the base station of the UMS using a single cell. 4. The method of claim 3, further comprising: demodulating the in-phase carrier and the quadrature carrier signals received through the antenna and despreading by in-phase PN codes during the delay time and the incident angle calculation step. A method for controlling a terminal position estimation device of a base station of a UTS using a single cell. The method of claim 3, further comprising the step of using the in-phase PN code in the synchronization process through the code acquisition and code tracking during the delay time and the incident angle calculation step. Control method of terminal position estimator. 4. The method of claim 3, wherein the angle corresponding to the value of the least error is determined as the incident angle through comparison between the signal calculated by the lookup table and the phase mono pulse output value of the actually received signal during the terminal position calculation step. A method for controlling a terminal position estimator of a base station of a UE using a single cell, characterized in that it comprises a step. The terminal position of the base station of the UE using a single cell, characterized in that during the terminal position calculation step of calculating the position value of the terminal using the output value of the following phase mono pulses; Control method of estimator. Output value of phase mono pulse =