KR20010110518A - Mobile Subscriber Location Positioning System and Method - Google Patents

Abstract

PURPOSE: A system for measuring a position of a mobile terminal and a method therefor are provided so that the position of the mobile terminal can be easily detected without using a global positioning system, by using geographical information stored in each cell of a base station manager. CONSTITUTION: A plurality of base stations(Node B1-Node Bn) control radio communication with mobile terminals in their regions, and broadcast the received system information. At least one control station(RNC1-RNCp) controls the operation of the base stations(Node B1-Node Bn) in its region, generates a system information block, and transmits the system information to the corresponding base station. At least one mobile terminal measures CPICH Ec/No of the adjacent cell according to the system information. A central ATM network(CAN) controls the operation of the control station(RNC1-RNCp). A base station manager manages the base stations(Node B1-Node Bn) and the control station(RNC1-RNCp), stores at least one geographical information, and determines a position of a specific mobile terminal according to the geographical information. A mobile switching center(MSC/SGSN) switches the message received in one control station(RNC1-RNCp). A location service server(LCS) measures the position of the mobile terminal in the control of the mobile switching center(MSC/SGSN). A home location register(HLR) registers a location of the assigned mobile switching center.

Description

Mobile Subscriber Location Positioning System and Method

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a system and method for measuring a position of a mobile terminal. In particular, in an IMT-2000 system of a direct spread (DS) method, an asynchronous control station without a GPS (Radio Network Controller: RNC) The present invention relates to a position measuring system and method of a mobile terminal.

In the conventional direct spread (DS) type IMT-2000 system, as shown in FIG. 1, a plurality of control stations RNC1 to RNCp are connected to a core network 10 and each control is performed. The station RNC is connected to a plurality of base stations Node B1 to Node Bn.

In addition, a location service server (LCS) for identifying detailed positions of a plurality of mobile terminals UE1 to UEn is linked with a home location register HLR to measure the location of a specific mobile terminal. have. Here, the base station manager (BSM) serves to manage a radio network controller (RNC) and a base station Node B of the mobile communication system.

In the mobile communication system having such a configuration, in order to provide location information of a specific mobile terminal, an interface application part between the core network 10 and the control station RNC, the control station RNC, and the base station Node B is provided. Iu, Iub interface, Radio Access Network Application Part (RANAP) and Node BApplication Part (NBAP) are used, respectively. The reason is for lossless transmission of signaling messages and traffic data between the core network 10 and the base station RNC and the control station RNC and the base station Node B. In particular, RRC (Radio Resource Control), RLC (Radio Link Control) and MAC for the delivery of a signaling message between the mobile terminal and the UTRAN (network consisting of a control station (RNC) and a base station (Node B)). (Medium Access Control) layer exists, and there is an Access Link Control Application Part (ALCAP) protocol for establishing a bearer between the core network 10, the control station (RNC), and the base station (Node B).

In order to measure the position of a specific mobile terminal in the conventional method shown in FIG. 1, the measurement is performed using a triangulation method using GPS provided to the control station RNC and the base station Node B, or other similar methods. . That is, the position measurement using the GPS at the controller and the base station (Node B) is possible through the report on a few cells (cells) that a specific mobile terminal (UE) is best by the control command of the base station (Node B). did. Therefore, when necessary, the operator of the communication system was able to make an emergency call of a specific mobile terminal, and an application of a location measurement service that may appear in the future was possible.

However, in the future, the DS-based communication system, which is commercially available, in principle, does not use GPS, and thus, the conventional method of measuring the mobile terminal shown in FIG. 1 cannot be applied as it is, without information such as latitude and longitude provided by the GPS. There is a demand for a technology capable of identifying a detailed position of a mobile terminal. That is, even in the case where there is no GPS in the conventional UTRAN, a new location detecting method is needed to determine the detailed location of the mobile terminal.

An object of the present invention has been proposed to solve the above problems, the position of a specific mobile terminal in the direct spread (DS) IMT-2000 system without a global positioning system (GPS) It is to provide a position measuring system and method of a mobile terminal that can be easily understood.

In order to achieve the above object, a position measuring system of a mobile terminal according to the present invention comprises: a plurality of base stations for controlling wireless communication with a mobile terminal in its area and broadcasting received system information; At least one control station that controls the operation of the base stations in its own area, generates a system information block, and transmits the system information to the base station, and when the system information is received at an arbitrary position according to the system information, At least one mobile terminal for measuring a value representing a ratio between the system information and noise, a controller network controlling the operation of the control station, the base stations and the control station, and storing at least one topographical information. Is configured to include a base station manager for determining the location of a specific mobile terminal using the stored information when necessary.

In addition, the method for measuring the position of a mobile terminal according to the present invention comprises the steps of storing the corresponding system information for each cell by the field test and the topographic information about the position according to the value of the noise ratio to the base station manager, and generates a system information block at the control station Transmitting the information to the base station; broadcasting the system information to the terminal according to scheduling information; and receiving the system information block from a specific mobile terminal in a service area of the base station. Measuring the values of the system information and the noise ratio for the neighbor cell; and, when the base station manager requests the location of a specific terminal, reporting the measured values; and storing the measured values and the base station manager. And determining the location of the specific terminal in comparison with the information. And that is characterized.

1 is a block diagram of a position measuring system of a mobile terminal in a conventional IMT-2000 system.

2 is a block diagram of a system for measuring a position of a mobile terminal in an IMT-2000 system according to the present invention;

3 is a control flow diagram illustrating a processing state of a system information broadcast according to an embodiment of the present invention.

4 is a control flowchart illustrating a processing state of an RRC connection establishment procedure according to an embodiment of the present invention.

* Explanation of symbols for main parts of the drawings

UE: user terminal Node B: base station

BSM: Base Station Manager RNC: Control Station

MSC: Mobile Exchange HLR: Home Location Register

LCS: Location Provision Server CAN: Controller Network

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

2 is a block diagram of a position measurement system of a mobile terminal in an IMT-2000 system according to the present invention. 2, in the IMT-2000 system, a location measurement system of a mobile terminal controls wireless communication with a mobile terminal within its own area, and includes a plurality of base stations (Node B1 to Node Bn) for broadcasting received system information. ; According to the system information and one or more control stations (RNC1 ~ RNCp) for controlling the operation of a plurality of base stations (Node B1 ~ Node Bn) in its own area, and generates a system information block to transfer the system information to the base station At least one mobile terminal UE1 for measuring CPICH Ec / No for an adjacent cell, and a controller network for controlling the operation of control stations RNC1 to RNCp; A base station manager (BSM) that manages a plurality of base stations (Node B1 to Node Bn) and control stations (RNC1 to RNCp), stores one or more topographical information, and determines the location of a specific mobile terminal using the stored information when necessary. And a mobile switching station (MSC / SGSN) for switching messages sent from control stations RNC1 to RNCp in its own area or arriving at specific control stations RNC1 to RNCp in its own area; A location providing server (LCS) for measuring the location of a specific mobile terminal under control of the switching center (MSC / SGSN) and a home location register (HLR) for registering the location of the mobile switching center assigned thereto.

In the position measurement system of the mobile terminal in the IMT-2000 system configured as described above, detailed positioning of the specific mobile terminal is included as a function in the base station manager (BSM). In other words, the role of the existing base station manager (BSM) includes a collection function and determination function for determining the detailed location of the mobile terminal, the information of the CPICH Ec / No for each cell (mobile terminal at any position When the system information is received, there is a terrain map according to a value indicating a ratio between the system information and noise. This value should be defined at the time of cell planning. That is, through the field test (Field Test) to generate the terrain information, such as contour lines for the possible position according to the corresponding Ec / No for each cell and stores in the control station (RNC). The control station generates system information for each cell (S1) and then provides system information to the corresponding base station Node B through the NBAP (S2).

On the other hand, since the CPICH Ec / No is changed when the terrain or building changes, it is necessary to continuously adjust the relationship between the CPICH Ec / NO and the terrain map through the continuous modification work in the base station manager (BSM).

In order to implement the detailed positioning function of the mobile terminal in the UTRAN without GPS proposed in the present invention, the RRC procedure, the System Information Broadcast function and the RRC connection establishment procedure, must be modified.

In the embodiment of the present invention, although there are several system information provided by the UTRAN, only the SIB 11 (System Information Block Type 11) will be described.

For a preferred embodiment of the present invention, it is preferable that the SIB11 is changed as shown in Table 1 below.

IE / Group Name Presence Range Comment Reference to other system information clocks 0 ... maxSysInfoBlockcount 〉 Scheduling information M Measured Control Information M 1 ... maxMeasurementTypecount 〉 Measurement Type M CHOICE Measurement 〉 Intra-Frequency M 〉 Inter-Frequency C-Interfreq 〉 Inter-System C-Intersys 〉 Traffic Volume O 〉 UE Internal O

In Table 1, SIB 11 is broadcast information including definitions of measurement variables that a mobile station should measure in an idle state. In the existing 3GPP standard, the Intra-Frequency Measurement Type is "Conditional". ", But was modified to" Mandatory "in Table 1. Therefore, after receiving the system information from the base station (Node B), broadcast according to scheduling information (S3), and the mobile terminal always measures the CPICH Ec / No for the adjacent cell (S4). At this time, when the mobile terminal establishes an RRC connection or requests the system as necessary, the mobile terminal reports to the communication system in response thereto (S5).

As shown in FIG. 2, generation of system information is performed at the control station (RNC), and repetition and actual transmission are performed at the base station (Node B), and thus are transmitted to the base station (Node B) through an NBAP message. The process of doing so is included.

In addition, as shown in FIG. 4, in the RRC connection setup procedure, an RRC connection request message is a message transmitted from the mobile terminal to the UTRAN as shown in Table 2 below (S11 and S12).

IE / Group Name Presence Range Comment Message Type M Initial UE Identity M Establishment Cause M Initial UE Capability M Measured results on RACH M

At this time, the control station (RNC) determines whether the establishment cause is due to the LCS response using Table 2 (S13). This is because the control station (RNC) receiving the RRC connection request message transmitted from the mobile terminal generally performs an operation for generating a signaling channel. However, as described above, since it is not necessary to create a signaling channel to measure the position of a specific mobile terminal, an item called an LCS response is preferably added.

At this time, in step S13, if the cause of the setting is the LCS response, the control station (RNC) receives the RRC connection request message and does not perform an operation for generating a signaling channel, and is measured on the RACH in the message. The result information is analyzed and then CPICH Ec / No values for neighboring cells are transmitted to the base station manager BSM (S14). Since the base station manager (BSM) stores a terrain map such as contour lines based on CPICH Ec / No values in each cell, the position of the mobile terminal is accurately determined using a plurality of CPICH Ec / No values (S15). However, in step S13, if the cause of the setting is not an LCS response, the control station RNC executes a normal RRC connection setting procedure (S16).

Therefore, since the position of the mobile terminal is measured at the request of the communication system irrespective of the intention of the mobile terminal, it is useful to cope with an emergency situation.

As described above, according to the present invention, even if the global location system (GPS) is not installed, the existing base station manager (BSM) stores the terrain information for each cell, so that the specific mobile terminal is stored using the stored terrain information when necessary. Can accurately measure the position of. Since the location measurement of the mobile terminal is performed by the request of the communication system regardless of the intention of the mobile terminal itself, it can be very useful when the user of the mobile terminal is in an emergency situation.

Claims (4)

A plurality of base stations for controlling wireless communication with mobile terminals within its own area and broadcasting received system information; At least one control station that controls the operation of the base stations in its area and generates a system information block and transmits system information to the base station; At least one mobile terminal for measuring a value representing a ratio between the system information and noise when the system information is received at an arbitrary position according to the system information; A controller network for controlling the operation of the control station; A base station manager for managing the base stations and control stations, storing location information according to the system information and noise ratio, and determining a location of a specific mobile terminal by comparing with a value measured by the mobile terminal if necessary. Position measuring system of a mobile terminal, characterized in that the. Storing the corresponding system information for each cell by the field test and the terrain information on the location according to the value of the noise ratio in the base station manager; Generating a system information block at a control station and transmitting the system information block to a corresponding base station; Broadcasting, at the base station, the system information to a terminal according to scheduling information; Measuring a value of system information and a noise ratio of a neighbor cell when the system information block is received by a specific mobile terminal in a service area of the base station; Reporting the measured value when the base station manager requests the location of a specific terminal; And determining the location of the specific terminal by comparing the measured value with information stored in the base station manager. The method of claim 2, wherein the reporting of the measurement value comprises: Transmitting, at the mobile terminal, an RRC connection request message to the control station; Determining, at the control station, that the cause of the connection request is due to a response from a location providing server; And if the determination result is a response from the location providing server, reporting the value measured by the specific mobile terminal to the base station manager. The method of claim 2, And the system information block includes a command for the mobile terminal to measure the values of the system information and the noise ratio for the neighbor cell.