JP5648434B2 - Radio base station and position detection method - Google Patents

Description

  The present invention relates to the operation of a small radio base station having relatively weak transmission radio waves, and to the technical field of position detection of the radio base station.

  As a small-sized radio base station of this type, a femtocell base station with a relatively weak transmission radio wave having a service area of several meters to several tens of meters has been recently studied. Since the femtocell base station can be configured with small hardware compared to a so-called macrocell base station used in the past, the femtocell base station has a feature that it is easy to move and install. On the other hand, there is a possibility that relocation that is not intended by the administrator can be easily performed.

  When the femtocell base station is moved, there is a possibility that the radio wave condition may be adversely affected, such as deterioration of interference with a radio wave transmitted from another femtocell base station or a macro cell having a wider service area in the vicinity. In order to detect and compensate for the deterioration of interference due to such movement on the system manager side, some function for detecting the position or relocation of each femtocell base station is required. For example, the following method is known.

  For example, by providing a GPS device in the femtocell base station and notifying the system administrator of the position of the femtocell base station at a predetermined cycle or the like, the administrator can grasp the current position and the change in the position. Further, by assigning a unique IP address to the femtocell base station, the administrator side can grasp the current position from the IP address.

  As another method, a femtocell base station may be provided with an antenna capable of measuring the radio wave conditions of neighboring base stations, and the own position may be calculated based on the measured radio wave intensity and position of the neighboring cells. . The following prior art documents describe a position measuring method using the radio wave conditions of such peripheral cells.

JP 2009-52948 A JP 2003-18073 A JP 2008-22524 A

  The above-described femtocell base station position measurement method has the following technical problems, for example. In order to realize a position measurement method using a GPS device, it is necessary to provide a GPS device in each femtocell base station, which increases the cost of the device configuration. Further, there are cases where position measurement by GPS cannot be performed, such as when a femtocell base station equipped with a GPS device is installed in a dead zone where GPS radio waves cannot be received.

  In addition, in the method of assigning the IP address of the core network to the femtocell base station, the extension of the physical line using L2SW (Layer 2 Switch) or the like, or the remote location using the tunneling technology such as VPN (Virtual Private Network) The position of the femtocell base station can be camouflaged by transfer or the like. For this reason, there is a possibility that the relocation of the femtocell base station due to malicious intentions cannot be detected. In addition, this method has a technical problem that the change in the position of the femtocell base station cannot be measured.

  Further, in the position measurement based on the radio wave condition of the peripheral cell via the antenna, it is necessary to provide the femtocell base station with an antenna capable of receiving the radio wave of the peripheral cell, which increases the cost in apparatus configuration. Further, there may be a case where position measurement cannot be performed, for example, when there is no other base station around the position where the femtocell base station is installed, or when there is a positional relationship where radio waves cannot be received even if the base station exists. Further, since the position is estimated by calculation, it is necessary to secure a sufficient number of data for acquiring the position information.

  The same technical problem can occur not only in the position measurement of the femtocell base station but also in the position measurement of an arbitrary radio base station.

  In view of the technical problems described above, the present invention provides a position detection method and a radio base that can perform position measurement without being affected by the installation position of a radio base station, the situation of surrounding base stations, and the like. The issue is to provide a station.

  In order to solve the above-described problem, a disclosed radio base station is a radio base station capable of communicating with a radio terminal, and includes a reception unit and a position estimation unit. The receiving unit receives a signal including position information of the wireless terminal and received power from the wireless base station received by the wireless terminal, transmitted from the wireless terminal. The position estimation unit estimates the position of the radio base station based on the position information and the received power.

  The disclosed position detection method is a position detection method implemented in a radio base station, and includes a reception step and a position estimation step. The reception step performs the same operation as the reception unit provided in the above-described radio base station. The position estimation step performs the same operation as the position estimation unit provided in the above-described wireless base station.

  According to the above-described configuration, it is possible to measure the position of the radio base station and estimate the change in position without adding a new device to the radio base station. In addition, since the position is estimated based on information transmitted from the wireless terminal, the position is estimated even when the wireless base station is located in a dead zone of radio waves or GPS from neighboring base stations. Is possible.

It is a figure which shows the whole structure of a mobile communication system. It is a block diagram which shows the hardware constitutions of eNB. It is a block diagram which shows the function part with which eNB is provided. It is a block diagram which shows the structure of a broadband router. It is a block diagram which shows the hardware constitutions of the communication carrier apparatus which manages a mobile communication system. It is a block diagram which shows the function part with which the communication carrier apparatus which manages a mobile communication system is provided. It is a block diagram which shows the hardware constitutions of UE. It is a block diagram which shows the function part with which UE is provided. It is a sequence diagram which shows the flow of the operation | movement which receives the signal from UE. It is a sequence diagram which shows the flow of operation | movement which stores information in a database. It is a figure which shows the example of the data stored in a database. It is a figure which shows the example which prescribed | regulated the mesh-shaped area around eNB. It is a figure which shows the example of the data regarding the interference degree stored in a database. It is a figure which shows the example which prescribed | regulated the circular area around eNB. It is a flowchart which shows the flow of the operation | movement which determines the position change of eNB, and the deterioration of interference. It is a figure which shows the example of a display in the case of performing notification of a determination result via UE.

  Embodiments for carrying out the invention will be described below.

(1) Configuration Example A configuration of a mobile communication system 1 which is an example of the disclosed mobile communication system will be described with reference to FIG. FIG. 1 is a block diagram showing the overall configuration of the mobile communication system 1. The mobile communication system 1 is, for example, a W-CDMA (Wideband-Code Division Multiple Access) or LTE (Long Term Evolution) wireless communication system.

  As shown in FIG. 1, a mobile communication system 1 includes a radio base station (eNB: evolved Node B) 100, a broadband router 200, a mobile communication carrier 300, a user terminal (UE: User Equipment) 400, Internet network 500.

  The eNB 100 is connected to the Internet network 500 via the broadband router 200, forms a cell by transmitting a transmission radio wave via an antenna, and communicates with the UE 400 located in the cell Station.

  The eNB 100 is a base station called a femtocell radio base station, for example, and is a small base that enables simultaneous communication of about 4 to 16 users assuming use in a relatively small area such as a home, office, or commercial facility. It is a station device. Hereinafter, embodiments of the eNB 100 will be described using a femtocell radio base station as an example.

  In addition to the femtocell radio base station, the eNB 100 may be a macro cell or a micro cell radio base station that can form a wider cell, or may form a narrower cell.

  FIG. 2 is a block diagram illustrating an example of the hardware configuration of the eNB 100.

  As shown in FIG. 2, the eNB 100 includes an RF 101, a system-on-a-chip (SoC) chip 102, a DSP (digital signal processor) 103 and a CPU 104 formed on the SoC chip 102, a memory 105, and a network interface. A card (NIC: Network Interface Card) 106 is provided. The RF 101 is a circuit that communicates with the UE 400 by transmitting a transmission radio wave via an antenna to form a cell (for example, a femto cell) and receiving a transmission radio wave from the UE 400 located in the cell. is there. The SoC chip 102 is a semiconductor chip on which a circuit including, for example, the DSP 103 and the CPU 104 is formed. The DSP 103 performs processing for converting information received via the network into a mode for outputting from the RF 101 and processing for converting information received at the RF 101 into a mode for transmitting to the network. The CPU 104 controls the operation of each unit of the eNB 100 and performs various operations described below by executing a program stored in the memory 105, for example. The NIC 106 is a card or the like that is connected to the broadband router 200 via a LAN and has an interface function for performing communication.

  FIG. 3 is a block diagram illustrating functions provided in the eNB 100 as functional units for convenience. As shown in FIG. 3, the eNB 100 includes a LAN interface (eNB) 111, a radio control unit (eNB) 112, a radio transmission / reception unit (eNB) 113, a CSG control unit 114, an MR signal reception unit 115, an MR database 116, and a position estimation. Unit 117, radio quality estimation unit 118, and result determination notification unit 119. These functional units allow the eNB 100 to acquire and analyze RRC protocol information, which is a radio control signal transmitted to and received from the UE 400, separately from the original call processing function. Hereinafter, each functional unit will be described in more detail.

  The LAN interface (eNB) 111 is a functional unit corresponding to the NIC 106, for example, and is an interface for communicating information with the broadband router 200, and is connected via a LAN (Local Area Network). For this reason, the LAN interface (eNB) 111 has a unique IP address.

  The radio control unit (eNB) 112 is a functional unit that indicates functions implemented by the operations of the DSP 103 and the CPU 104, and controls radio communication between the UE 400 and the eNB 100. The radio control unit (eNB) 112 controls a communication connection (in other words, a session), a communication channel (in other words, a transport channel), or the like using an RRC protocol or the like based on a communication control rule such as 3GPP.

  The radio transmission / reception unit (eNB) 113 is a functional unit corresponding to the RF 101, for example, and performs radio communication between the UE 400 and the eNB 100 via the antenna of the eNB 100. The radio transmission / reception unit (eNB) 113 transmits / receives a radio signal using a physical channel based on a communication control rule such as 3GPP.

  The functional units of the CSG control unit 114, the MR signal receiving unit 115, the MR database 116, the position estimation unit 117, the wireless quality estimation unit 118, and the result determination notification unit 119 are functional units indicating functions realized by the CPU 104 and the memory 105. It is. For example, the CPU 104 executes a program stored in the memory 105 to perform operations corresponding to various functional units described below.

  The CSG control unit 114 performs access control for each user (in other words, for each UE 400) based on a CSG (Closed Subscriber Group) database stored in the subscriber database 313 of the mobile communication carrier 300. Specifically, for each eNB 100, the UE 400 registered in the eNB 100 can communicate with the eNB 100, and for the other UE 400, the communication session is disconnected. Note that the CSG control unit 114 controls access to receive an RRC Measurement Report signal (hereinafter referred to as an MR signal) in response to a GPS position measurement request from the UE 400 that is not registered in the eNB 100.

  The MR signal reception unit 115 acquires a value related to MR transmitted from the UE 400 among communication contents performed by the radio control unit (eNB) 112. The MR signal acquisition unit 115 transmits the acquired value to the MR database 116.

  The MR database 116 is a database that stores MR transmitted from the MR signal receiving unit 115.

  The position estimation unit 117 refers to the MR stored in the MR database 116, and receives the received signal strength (in other words, received power) such as GPS position information and RSCP (Received Signal Code Power) value of the source UE 400 included in the MR. ) On the basis of the position of the eNB 100 (in other words, calculation) is periodically performed.

  The radio quality estimation unit 118 refers to the MR stored in the MR database 116, determines the radio quality of the eNB 100 based on the GPS location information of the source UE 400 included in the MR and the radio wave conditions of the neighboring cells of the eNB 100, and Cell radio quality estimation (in other words, calculation) is periodically performed.

  The result determination notification unit 119 appropriately observes the position or radio quality estimated by the position estimation unit 117 or the radio quality estimation unit 118. When there is a change in the position or radio quality of the eNB 100 to be observed, the result determination notification unit 119 determines whether the eNB 100 has moved, whether the eNB 100 has changed in radio quality, and whether there has been a change in radio quality in neighboring cells. Do. Further, the determination result is notified to the OAM unit 314 (see FIG. 6) of the mobile communication carrier 300 based on a preset rule. At this time, the result determination notification unit 119 may notify using a maintenance protocol such as TR-069 or SNMP. Further, the result determination notification unit 119 may notify the UE 400 instead of the OAM unit 314.

  The broadband router 200 is a device that connects the eNB 100 and the Internet network 500. FIG. 4 is a block diagram illustrating an example of a hardware configuration of the broadband router 200. As shown in FIG. 4, the broadband router 200 includes a gateway 201 for connecting to the Internet network 500 and a LAN interface (router) 202 for connecting to a LAN such as a private house, a store, or an office where the eNB 100 is installed. Prepare.

  The gateway 201 is a gateway connected to the Internet network 500. The gateway 201 transfers a connection request from the eNB 100 to the Internet network 500 to the Internet network 500, while transferring a connection request from the Internet network 500 to the eNB 100 to the eNB 100.

  A LAN interface (router) 202 is connected to a LAN interface (eNB) 111 via a LAN to communicate information.

  The mobile communication carrier 300 is an operator or management device that manages the mobile communication system 1 for providing a communication service using the UE 400 to a user. FIG. 5 is a diagram illustrating an example of a hardware configuration of the mobile communication carrier 300 that is a management device of the mobile communication system 1. As shown in FIG. 5, the mobile communication carrier 300 includes an LSI (Large Scale Integration) 301, a CPU 302, and a memory 303. The LSI 301 is a circuit that is connected to the broadband router 200 via the Internet network 500 and performs information communication. The CPU 302 controls the operation of each unit of the mobile communication carrier 300 and implements the following functions by executing a program stored in the memory 303, for example. The memory 303 is a storage device that stores data related to the operation of the mobile communication carrier 300.

  FIG. 6 is a block diagram illustrating functions provided in the mobile communication carrier 300 as functional units for convenience. As shown in FIG. 6, the mobile communication carrier 300 includes a core network unit 311, an eNB termination unit 312, a subscriber database 313, an OAM (Operation And Management) unit 314, and a terminal information database 315.

  The core network unit 311 serves as a gateway to the subscriber database 313 and has functions necessary for communication status management, such as a system usage fee billing process for users registered in the subscriber database 313.

  The eNB termination unit 312 performs processing of data transmitted and received in communication with the eNB 100 via the Internet network 500.

  The subscriber database 313 is stored in the memory 303 for the CSG that can use the mobile communication system 1, in other words, the user that can use the home eNB 100 that can be connected to the mobile communication system 1, the UE 400 or the eNB 100. It is a database that stores information. The subscriber database 313 stores, as a CSG database, information indicating which eNB 100 can communicate with the mobile communication system 1 for each user or UE 400, for example.

  The OAM unit 314 performs monitoring of failure occurrence of the eNB 100 included in the mobile communication system 1, management of firmware update, and the like. Moreover, the OAM part 314 receives this notification, when the notification of the transfer about this eNB100 is transmitted from the result determination notification part 119 of eNB100.

  The terminal information database 315 stores the gain of the antenna for transmitting radio waves for each type of terminal for the UE 400 used in the mobile communication system 1.

  The UE 400 is located in a cell formed by the eNB 100 and communicates via the Internet network 500 by connecting to the eNB 100. With reference to FIG.7 and FIG.8, the fundamental structure and function of UE400 are demonstrated.

  FIG. 7 is a block diagram illustrating an example of a hardware configuration of the UE 400. As illustrated in FIG. 7, the UE 400 includes an antenna 401, an amplifier 402, a CPU 403, a memory 404, a display screen 406, and an input device 407.

  The antenna 401 is an antenna that communicates by receiving a transmission radio wave from the eNB 100 and transmitting the transmission radio wave to the eNB 100. The amplifier 402 amplifies a signal transmitted / received in the antenna 401. The CPU 403 controls the operation of each unit of the UE 400 and, for example, executes a program stored in the memory 404 to cause each unit of the UE 400 to perform various operations described later. The memory 404 is a memory for storing a program for operating the CPU 403, data received via the antenna 401, other user data, and the like. The display screen 405 is displayed for the purpose of allowing the user to browse predetermined information under the control of the CPU 403. The input device 406 is an interface for inputting instructions from the user, audio data, and the like to the CPU 403. The input device 406 also includes an interface for receiving an external GPS signal and receiving position measurement data.

  FIG. 8 is a block diagram illustrating the functions of the UE 400 as functional units for convenience. As shown in FIG. 8, the UE 400 includes a radio transmission / reception unit (UE) 411, a radio control unit (UE) 412, an application execution unit 413, a display unit 414, a GPS function unit 415, and an input unit 416.

  The radio transmission / reception unit (UE) 411 is a functional unit that performs radio communication between the UE 400 and the eNB 100, and transmits / receives a radio signal via a physical channel based on a communication control rule such as 3GPP via the antenna 401.

  The radio control unit (UE) 412 is a functional unit that controls radio communication between the UE 400 and the eNB 100. The radio control unit (UE) 412 controls a communication connection (in other words, a session), a communication channel (in other words, a transport channel), or the like based on a communication control rule such as 3GPP using the RRC protocol or the like.

  The application execution unit 413 is a functional unit that executes an application stored in the memory 404. For example, the application execution unit 413 executes Web, map software, or the like using GPS position information, and displays the execution result on the display screen 406.

  The display unit 414 is a functional unit that displays an execution result or the like of the application execution unit 413 on the display screen 406. The display unit 414 also displays notification messages from the eNB 100 and the mobile communication carrier 300 on the display screen 406.

  The GPS function unit 415 performs position measurement using the GPS of the UE 400 via the input device 416 in response to a user instruction, a request from an application executed in the application execution unit 413, a request from the eNB 100, or the like. .

  The input unit 416 is a functional unit that receives input of user instructions input via the input device 407, position measurement results using GPS, and the like.

  The internet network 500 is a wide area internet network that can be connected to, for example, a general web.

(2) Operation Example Hereinafter, the operation of each unit of the mobile communication system 1 will be described in detail. The eNB 100 of the mobile communication system 1 estimates its own position and notifies the mobile communication carrier 300 by the operation described below. In the following description, for convenience, a cell formed by an eNB 100 (for example, another femto cell base station or a macro cell base station) installed in the vicinity of the eNB 100, separately from the eNB 100 that performs position measurement, This is explained using the notation. Even when there are a plurality of peripheral cells 600, the description of the peripheral cell 600 is used in the description without distinguishing each.

(2-1) MR signal reception processing from UE 400 First. A flow of an operation of receiving an MR signal from the UE 400 with which the eNB 100 is communicating in the operation of estimating the position of the eNB 100 will be described. FIG. 9 is a sequence diagram showing a flow of a series of operations.

  For example, the UE 400 in communication with the eNB 100 transmits an MR (Measurement Research) signal obtained by signalizing measurement results such as radio quality of received radio waves from the eNB 100 and the neighboring cell 600 to the eNB 100 at a predetermined cycle.

The MR signal includes, for example, cell identification information about a cell from which the UE 400 has received radio waves, an ID for identifying each cell, radio quality (for example, interference degree and reception intensity) of radio waves received from the cell, and the like. Here, the interference degree is, for example, an Ec / No value, and is represented by a ratio of received power from a corresponding cell to total received power received by the UE 400, or the like. The reception strength is the reception power from the corresponding cell. The radio control unit (UE) 412 of the UE 400 measures or acquires information such as the interference degree and the reception intensity based on the radio status of the eNB 100 received by the radio transmission / reception unit (UE) 411. The radio control unit (UE) 412 generates an MR signal from the acquired information and transmits the MR signal to the eNB 100. In addition to the cell information described above, the UE 400 uses its own GPS function unit 415 by executing an application or the like. When the position measurement is performed, the UE 400 transmits the MR signal including the GPS data related to the position measurement of the position. The GPS information includes, for example, data such as latitude, longitude, and altitude as information for specifying the three-dimensional position of the UE 400.

  When the radio control unit (UE) 412 of the UE 400 is requested to measure the position information of the UE 400 from the application execution unit 413 or the input unit 416, the position measurement of the position information using the GPS is performed with respect to the GPS function unit 415. Instruct.

  Next, the operation of the eNB 100 that has received the MR signal from the UE 400 will be described with reference to the sequence diagram of FIG. The radio control unit (eNB) 112 of the eNB 100 inquires of the CSG control unit 114 whether or not the transmission source UE 400 is a user capable of communicating with its own eNB 100. For example, the CSG control unit 114 moves an inquiry message including an identification ID (for example, CSGID) set for the eNB 100 and an IMSI (International Mobile Subscriber Identity) that is an identification ID of the UE 400 to be inquired. Transmit to the body communication carrier 300. The subscriber database 313 of the mobile communication carrier 300 that has received the inquiry message returns a response message notifying whether or not communication is possible in response to the message.

  If the UE 400 is not a terminal capable of communicating with the eNB 100, after receiving the MR signal, the CSG control unit 114 disconnects the communication session and disables subsequent communication. When the UE 400 is a terminal capable of communicating with the eNB 100, the MR signal receiving unit 115 of the eNB 100 constantly monitors signal contents transmitted and received between the radio control unit (eNB) 112 and the UE 400. When the radio control unit (eNB) 112 receives an MR signal, the MR signal receiving unit 115 stores information included in the MR signal in the MR database 116. At this time, the MR signal reception unit 115 receives the MR signal reception time, reception time, the UESI IMSI value, for example, terminal model information such as an IMEI (International Mobile Equipment Identity) value, the transmission power value of the eNB 100 at the time of reception, The used frequency band is also acquired from the radio control unit (eNB) 112 and stored in the MR database 116. In addition, the MR signal reception unit 115 obtains a reception antenna gain for the UE 400 by inquiring the terminal information database 315 of the mobile communication carrier 300 for the obtained terminal model information, and stores it in the MR database 116.

  In the MR database 116, MR signal information acquired from the received MR signal is stored in a manner as shown in FIG. As shown in FIG. 11, the MR database 116 stores an identification number such as a record number for each received MR signal. The stored data is classified into basic information, for example, information for each cell reported by MR signals, such as the cell of the eNB 100 and the neighboring cell 600, and GPS information. Basic information includes time information including the reception time of the MR signal, IMSI of the transmission source UE 400, terminal information including CSG attribute indicating whether communication with the eNB 100 is possible, transmission power of the eNB 100, transmission / reception frequency, It includes radio information including the receive antenna gain of UE 400. The information for each cell includes cell information including a cell identification ID of each cell, and radio quality including interference such as Ec / No value and received power such as RSCP. The GPS information includes position information such as latitude, longitude, and altitude that identifies the three-dimensional position of the UE 400 that is the transmission source of the MR signal.

(2-2) Estimating Operation of eNB 100 Position An operation of estimating the position of the eNB 100 based on information stored in the MR database 116 will be described. The position estimation unit 117 of the eNB 100 estimates the position of the eNB 100 based on the MR signal information stored in the MR database 116, for example, periodically or based on some trigger. Here, the trigger may be, for example, that a predetermined number of MR signal information is stored in the MR database 116 or that a request is made from the mobile communication carrier 300 side.

  At the time of estimation, the position estimation unit 117 reads three or more pieces of MR signal information stored after the previous estimation process from the MR database 116. The position estimation unit 117 estimates the position of the eNB 100 by calculation based on the GPS information included in the read MR signal information and the radio quality such as the RSCP value.

  Below, the example of the estimation operation | movement of the position of eNB100 by calculation is shown. First, the position estimation unit 117 calculates the distance between the eNB 100 and the UE 400. Specifically, the position estimation unit 117 acquires, from the read MR signal information, the radio field intensity A (dBm) such as the RSCP value of the radio quality received at the transmission source UE 400 and the reception antenna gain C (dB). To do. Further, based on the cell identification ID, the transmission power B (dBm), the transmission / reception frequency f (GHz), and the transmission antenna gain D (dB) of the eNB 100 are acquired.

  Here, when the distance between the eNB 100 and the UE 400 is d (m), the free section propagation loss Γ (dB) between the eNB 100 and the UE 400 can be approximated as 32.4 + 20 Logf (GHz) +20 Logd (m).

  Using the calculated free section propagation loss Γ (dB), “transmission power value B (dBm) + transmission antenna gain D (dB) + reception antenna gain C (dB) −free space propagation loss Γ (dB) = reception” The distance d (m) can be calculated from the relationship of “radio wave intensity (RSCP value) A (dBm)”.

  For the three pieces of MR signal information read out, the UE 400 that is the transmission source of the MR signal is set as UE # 1, UE # 2, and UE # 3, respectively. The GPS coordinate positions of each UE 400 are (a1, b1, c1), (a2, b2, c2), and (a3, b3, c3) in order of latitude and longitude. Further, the distance between each UE 400 and the eNB 100 calculated as described above is d1, d2, and d3, respectively. From these values, the latitude and longitude altitude (x, y, z) of the eNB 100 can be calculated from the three-square theorem. Specifically, for UE # 1, between (a1, b1, c1), d1, and (x, y, z), d1 ^ 2 = (x-a1) The relationship of ^ 2 + (y−b1) ^ 2 + (z−c1) ^ 2 holds. Similarly, for UE # 2, d2 ^ 2 = (x-a2) ^ 2 + (y-b2) ^ 2 + (z-c2) ^ 2, and for UE # 3, d3 ^ 2 = (x-a3) ^ The relationship of 2+ (y−b3) ^ 2 + (z−c3) ^ 2 holds. By solving these simultaneous equations, the latitude and longitude altitude (x, y, z) indicating the three-dimensional position of the eNB 100 can be calculated.

  The position estimation unit 117 records the latitude / longitude altitude indicating the calculated position of the eNB 100 and the calculated time in the memory 105. Further, the position estimation unit 117 stores the distance between the UE 400 and the eNB 100 used for the calculation in the MR database 116. Taking the data storage mode shown in FIG. 11 as an example, MR database 116 adds a data field called distance to the classification of terminal information, and stores the distance between eNB 100 and UE 400.

(2-3) Radio Quality Measurement Based on the estimated location information of the eNB 100, radio quality estimation operation according to interference with the UE 400 or the neighboring cell 600 around the eNB 100 will be described. The radio quality estimation unit 118 defines a predetermined area around the eNB 100, and based on the MR signal information stored in the MR database 116, the radio quality or interference degree of the transmission radio wave from the eNB 100 or the peripheral cell 600 for each area Mapping is performed.

  An example of the area defined by the wireless quality estimation unit 118 is shown in FIG. FIG. 12 divides an area around the eNB 100 into mesh areas having approximately the same area based on latitude and longitude, and defines absolute positions with respect to the eNB 100 for each area. In the example shown in FIG. 12, the eNB 100 is divided into a total of 16 areas, four (a, b, c, d) in the east-west direction and four (1, 2, 3, 4) in the north-south direction. Each area is divided by latitude and longitude. For example, the a1 area is east longitude aa degrees bb minutes 0.001 seconds to aa degrees bb minutes 0.002 seconds, north latitude xx degrees yy minutes 0.001 seconds to xx degrees It is defined as yy minutes 0.002 seconds.

  The radio quality estimation unit 118 of the eNB 100 includes the GPS information of the MR signal information used in the position estimation operation, the reception time, the CSG attribute, and other surroundings of the eNB 100 after the position estimation unit 117 performs the estimation operation of the eNB 100 The degree of interference such as the Ec / Bo value including the cell 600 is read. Then, from the GPS information of the read MR signal information, it is determined in which area the MR signal information is acquired, and the reception time, CSG attribute and interference degree (Ec / No value) are recorded for each area. Store in memory. FIG. 13 shows an example of the mode of data stored. As illustrated in FIG. 13, the wireless quality estimation unit 118 forms an interference degree database 118 a in the memory 105, for example. The interference degree database 118a includes the reception time of the MR signal for each area, basic information including the IMSI and CSG attributes of the source UE 400, cell identification IDs for the eNB 100 and the neighboring cell 600 transmitted from the UE 400, and Ec / No Stores a value.

By recording the interference level for each area in this way, it is possible to create a mapping of the interference level in the peripheral area centered on the eNB 100. By referring to such mapping of the interference degree, it is possible to confirm whether or not an abnormality relating to radio wave transmission has occurred in the cell of the eNB 100. Note that the radio quality estimation unit 118 uses other eNBs as a reference. The area may be defined in a manner. For example, FIG. 14 is a diagram illustrating a case where areas are defined concentrically with eNB 100 as the center. In FIG. 14, for example, a circle with a radius of 0.5 m from the eNB 100 is divided into eight equiangular, and each is defined as e1, e2, e3, e4, e5, e6, e7, e8 in the counterclockwise direction. Further, the ring from the radius 0.5 m to the radius 1.0 of the eNB 100 is divided into eight equiangular, and each is defined as f1, f2, f3, f4, f5, f6, f7, f8, and the radius 1 of the eNB 100 A ring from 0.0 m to a radius of 1.5 is divided into eight equiangular, and each is defined as g1, g2, g3, g4, g5, g6, g7, g8. By defining the area in this way, it is possible to map the degree of interference according to the linear distance from the eNB 100, and it is possible to manage a suitable cell.

  In addition, the area may be defined in any manner as long as the interference degree from the eNB 100 and the other neighboring cells 600 can be mapped in the vicinity of the eNB 100.

(2-4) Notification Operation Example The result determination notification unit 119 of the eNB 100 monitors the estimated location information of the eNB 100 and the interference degree mapping in the surrounding area as described above, and performs mobile communication when any change occurs. The manager of the OAM unit 314 of the carrier 300 or the eNB 100 is notified. An example of a flowchart is shown in FIG. 15 for a specific determination and notification operation flow.

  The result determination notification unit 119 of the eNB 100 refers to the position information of the eNB 100 estimated by the position estimation unit 117 periodically and compares them in time series to determine whether a change in position, that is, movement has occurred. . For example, the result determination notification unit 119 determines whether or not a change in position determined to be a movement occurs, such as a change in position in time series, in at least one of the latitude, longitude, and altitude of the position information. Determination is made (step S101).

  When a change in position is confirmed in the eNB 100 (step S101: Yes), the result determination notification unit 119 notifies the OAM unit 314 of the mobile communication carrier 300 of the change in position (step S107).

  When a change in position is confirmed in the eNB 100 (step S101: Yes), the result determination notification unit 119 refers to the mapping of the interference degree around the eNB 100 acquired by the radio quality estimation unit 118, and the peripheral area It is determined whether or not the degree of interference (Ec / No value) for the UE 400 located in the area has changed. The determination at this time is determined for each CSG attribute of each UE 400 with respect to the interference level from the eNB 100 and the interference level of the neighboring cell 600. Specifically, first, the result determination notification unit 119 determines whether or not the degree of interference such as the Ec / No value from the eNB 100 has deteriorated for the UE 400 whose CSG attribute is communicable with the eNB 100 (step S102). ). Subsequently, the result determination notification unit 119 determines whether or not the degree of interference such as the Ec / No value from the eNB 100 has deteriorated for the UE 400 whose CSG attribute cannot communicate with the eNB 100 (step S103). Subsequently, the result determination notification unit 119 determines whether or not the interference degree such as the Ec / No value from the neighboring cell 600 has deteriorated for the UE 400 whose CSG attribute is communicable with the eNB 100 (step S104). Subsequently, the result determination notification unit 119 determines whether or not the interference degree such as the Ec / No value from the neighboring cell 600 has deteriorated for the UE 400 whose CSG attribute cannot communicate with the eNB 100 (step S105).

  In any determination, if the result determination notification unit 119 determines that no deterioration of the interference degree is observed, the result determination notification unit 119 performs the same determination again after a predetermined period has elapsed (step S108).

  When the result determination notifying unit 119 determines that the degree of interference is deteriorated in any determination, the radio wave interference with the neighboring cell 600 is deteriorated due to the position change of the eNB 100, and the wireless quality is deteriorated. It judges and notifies the administrator of eNB100 to that effect (step S106).

  At this time, for example, the result determination notification unit 119 reduces the interference generated from the determination result and information stored in the MR database 116 on the display screen 406 of the UE 400 possessed by the administrator of the eNB 100. Notify by displaying the relocation method. FIG. 16 illustrates an example when a notification is displayed on the display screen 406 of the UE 400. In the example of Fig. 16, in order to notify the judgment result, the title "Femtocell installation position check" is titled "There is a possibility that the position of the femtocell where the customer is installed has been changed. Please confirm the installation position and return it to the original position if it has been changed.After moving, please push the following reconfirmation button.Relocation direction: About 5m southwest of the current state Is displayed. When the eNB 100 receives an instruction of “reconfirmation” from the administrator via the input device 407, the eNB 100 collects MR signal information again, and performs a determination on a change in position and an interference degree with respect to the eNB 100. Also good.

  The present invention is not limited to the above-described embodiments, and can be appropriately changed without departing from the spirit or idea of the invention that can be read from the claims and the entire specification, and a mobile communication system with such changes, Communication control apparatuses, communication control methods, radio base stations, and the like are also included in the technical scope of the present invention.

As mentioned above, the following additional remarks are further described about embodiment described in this specification.
(Appendix 1)
A wireless base station capable of communicating with a wireless terminal,
A receiving unit that receives a signal including the position information of the wireless terminal transmitted from the wireless terminal and the received power from the wireless base station received by the wireless terminal;
A radio base station, comprising: a position estimation unit that estimates a position of the radio base station based on the position information and the received power.
(Appendix 2)
The receiving unit receives the signals transmitted from at least three different wireless terminals, respectively,
The radio base station according to appendix 1, wherein the position estimation unit estimates the position of the radio base station based on the position information and the received power acquired from at least three different radio terminals. Bureau.
(Appendix 3)
A position determination unit that detects a change in the position of the radio base station estimated by the position estimation unit;
The receiver receives the signal multiple times at different times;
The position determination unit detects a change in the position of the radio base station by comparing the position information included in each of the signals and the estimation result by the position estimation unit based on the received power in time series. The radio base station according to appendix 1 or 2, characterized in that.
(Appendix 4)
A radio quality estimation unit for estimating radio quality at a predetermined point based on the signal;
The reception unit selects at least one of the radio base station and the radio base stations installed around the radio base station in the radio terminal, and obtains information on the degree of interference for the selected radio base station. Receiving said signal comprising:
The radio quality estimation unit estimates radio quality for the selected radio base station at a point indicated by the location information based on the location information and the interference level information included in the signal. The radio base station according to any one of appendices 1 to 3.
(Appendix 5)
A radio quality determination unit for detecting a time-series change in radio quality for the selected radio base station estimated by the radio quality estimation unit;
The receiving unit receives the signal including the interference degree information at different times a plurality of times,
The radio quality estimation unit compares the estimation results by the radio quality estimation unit based on the position information and the interference degree information included in each of the signals in time series, thereby selecting the selected radio base station The radio base station according to appendix 4, wherein a time-series change in radio quality is detected.
(Appendix 6)
The radio quality estimation unit divides a predetermined range based on the radio base station into a plurality of areas, and estimates the radio quality for the selected radio base station for each area of the plurality of areas. The radio base station according to appendix 4 or 5, characterized by the following.
(Appendix 7)
The wireless terminal further comprises a communication availability determination unit that determines whether or not communication with the wireless base station is possible based on contract information,
The radio quality determination unit detects a change in the radio quality estimated based on the signal transmitted from the radio terminal determined to be communicable with the radio base station by the communication availability determination unit. If a change is detected, a change is detected by comparing the estimation results by the radio quality estimation unit based on the signal transmitted from the radio terminal determined to be incapable of communication with the radio base station in time series. The radio base station according to appendix 5, wherein
(Appendix 8)
At least one of a case where the position of the radio base station has changed from a predetermined installation position set in advance and a case where the radio quality of the radio base station has changed from a predetermined radio quality set in advance The radio base station according to any one of appendices 4 to 7, further comprising a notification unit that notifies the manager of the radio base station about the change.
(Appendix 9)
The supplementary note 8 is characterized in that the notifying unit further notifies the location to move the radio base station to compensate for the change based on the estimated position of the radio base station and the radio quality. Wireless base station.
(Appendix 10)
A position detection method in a radio base station capable of communicating with a radio terminal,
A reception step of receiving a signal transmitted from the wireless terminal, including the position information of the wireless terminal and the received power from the wireless base station received by the wireless terminal;
A position estimation step of estimating a position of the radio base station based on the position information and the received power.

101 RF,
102 SoC chip,
103 DSP,
104 CPU,
105 memory,
106 NIC,
111 LAN interface,
112 radio control unit (eNB),
113 Radio transceiver (eNB),
114 CSG control unit,
115 MR signal receiver,
116 MR database,
117 position estimation unit,
118 Radio quality estimation unit,
119 result determination notification unit,
200 broadband router,
300 mobile communication carrier,
400 UE,
500 Internet network,
600 peripheral cells.

Claims (8)

A wireless base station capable of communicating with a wireless terminal,
Location information of the radio terminal transmitted from the radio terminal, received power from the radio base station received by the radio terminal , and radio base stations installed around the radio base station and the radio base station are selected. A receiving unit that receives a signal including interference information for at least one radio base station a plurality of times at different times ;
A position estimation unit that estimates the position of the radio base station based on the position information and the received power ;
A radio quality estimation unit that estimates radio quality for the selected radio base station based on the position information and the interference level information included in each of the signals received multiple times at different times;
A time-series change in radio quality for the selected radio base station is detected by comparing radio quality estimation results for the selected radio base station by the radio quality estimation unit in time series. A radio base station comprising a radio quality determination unit . The receiving unit receives the signals transmitted from at least three different wireless terminals, respectively,
The radio according to claim 1, wherein the position estimation unit estimates the position of the radio base station based on the position information and the received power acquired from at least three different radio terminals. base station. A position determination unit that detects a change in the position of the radio base station estimated by the position estimation unit;
The receiver receives the signal multiple times at different times;
The position determination unit detects a change in the position of the radio base station by comparing the position information included in each of the signals and the estimation result by the position estimation unit based on the received power in time series. The radio base station according to claim 1 or 2. The radio quality estimation unit divides a predetermined range based on the radio base station into a plurality of areas, and estimates the radio quality for the selected radio base station for each area of the plurality of areas. The radio base station according to claim 1 . The wireless terminal further comprises a communication availability determination unit that determines whether or not communication with the wireless base station is possible based on contract information,
The radio quality determination unit detects a change in the radio quality estimated based on the signal transmitted from the radio terminal determined to be communicable with the radio base station by the communication availability determination unit. If a change is detected, a change is detected by comparing the estimation results by the radio quality estimation unit based on the signal transmitted from the radio terminal determined to be incapable of communication with the radio base station in time series. The radio base station according to claim 1 , wherein: At least one of a case where the position of the radio base station has changed from a predetermined installation position set in advance and a case where the radio quality of the radio base station has changed from a predetermined radio quality set in advance in, for said change, the radio base station according to claim 1, 4 or 5, characterized by further comprising a notification unit for notifying the administrator of the wireless base station. The notification unit based on the position and the radio quality of the estimated the radio base station, to claim 6, characterized in that the further notify the location to move the radio base station in order to compensate for the change The radio base station described. A position detection method in a radio base station capable of communicating with a radio terminal,
Selected from the position information of the wireless terminal transmitted from the wireless terminal, received power from the wireless base station received by the wireless terminal , and wireless base stations installed around the wireless base station and the wireless base station Receiving a signal including interference information for at least one radio base station , a plurality of times at different times ;
A position estimating step of estimating the position of the radio base station based on the position information and the received power ;
A radio quality estimation step of estimating radio quality for the selected radio base station based on the position information and the interference level information included in each of the signals received a plurality of times at different times;
A time-series change in radio quality for the selected radio base station is detected by comparing radio quality estimation results for the selected radio base station in the radio quality estimation step in time series. A position detection method comprising: a wireless quality determination step .

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