JP2012080471A - Position estimation method and radio base station - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a position estimation method capable of acquiring a current installation position of a home base station.SOLUTION: A position estimation method includes a step S104 in which a radio base station eNB having a home base station HeNB within its own coverage transmits an MDT Configuration message for instructing Immediate MDT to a radio terminal UE corresponding to a predetermined trigger, a step S105 in which the radio terminal UE within the coverage of the home base station HeNB performs measurement of the home base station HeNB according to the MDT Configuration message, a step S106 in which the radio terminal UE within the coverage of the home base station HeNB transmits a Measurement Report message including the measurement result and position information showing the position when the measurement is performed to the radio base station eNB, and a step S108 in which a higher-level device of the radio base station eNB estimates an installation position of the home base station HeNB according to the position information included in the Measurement Report message.

Description

  The present invention relates to a position estimation method and a radio base station for estimating an installation position of a home base station.

  In recent years, attention has been focused on home base stations (sometimes referred to as HeNB or CSG cells), which are small radio base stations that have a coverage of a radius of several meters to several tens of meters and can be installed indoors. By installing a home base station, traffic distribution of a macro base station having a radius of about several hundred meters can be realized.

  On the other hand, in a mobile communication system, when a building is built around a radio base station or the installation status of a base station around the radio base station changes, the radio environment related to the radio base station changes. For this reason, conventionally, a drive test for measuring and collecting a wireless environment is performed by an operator using a measurement vehicle equipped with measurement equipment.

  Such measurement and collection of a wireless environment can contribute to optimization of parameters of a wireless base station or the like, but has a problem that man-hours are high and cost is high. Therefore, 3GPP (3rd Generation Partnership Project), which is a standardization project for mobile communication systems, uses MDT (Minimization of Drive Test), a technology that automates measurement and collection of wireless environments using wireless terminals owned by users. Specifications are being developed (see Non-Patent Documents 1 and 2).

  As a type of MDT, there is an immediate report type MDT (hereinafter referred to as Immediate MDT as appropriate). In the Immediate MDT, a wireless terminal in a connected state performs measurement, and reports a measurement result (hereinafter referred to as “measurement result” as appropriate) to a network together with location information. The connected state is a state in which the wireless terminal is executing communication.

3GPP TR 36.805 V9.0.0 “Study on Minimization of drive-tests in Next Generation Networks”, 2009-12 3GPP TS 37.320 v0.7.0, “Radio measurement collection for Minimization of Drive Tests (MDT)”, 2010-07

  By the way, the installation position of the radio base station is managed by the operator, and at the time of emergency call transmission or the like, the position of the radio terminal that made the emergency call transmission is specified using information on the installation position of the radio base station. Things have been done. However, since the home base station may be moved by a user, there is a problem that it is difficult for an operator to grasp the current installation position of the home base station.

  Therefore, an object of the present invention is to provide a position estimation method and a radio base station that can grasp a current installation position of a home base station.

  In order to solve the above-described problems, the present invention has the following features. First, the feature of the position estimation method according to the present invention is that a radio base station (radio base station eNB) in which a home base station (home base station HeNB) is installed in the coverage of the own station, according to a predetermined trigger, Transmitting a measurement configuration message (MDT Configuration message) for instructing an immediate report type measurement to a wireless terminal (wireless terminal UE); and a wireless terminal (wireless terminal UE) within the coverage of the home base station, In response to the measurement configuration message, the step of performing measurement on the home base station, and the location information indicating the position when the radio terminal (radio terminal UE) within the coverage of the home base station performs the measurement. A step of transmitting a measurement report message (Measurement Report message) to the radio base station, and the radio base station or a higher-level device of the radio base station ( Dynamic management apparatus MME or maintenance monitoring device OAM) is, the according to the location information included in the measurement report message, and summarized in that comprises a step of estimating the installation position of the home base station.

  According to such a feature, the wireless terminal within the coverage of the home base station performs measurement for the home base station in response to the measurement configuration message for instructing immediate report type measurement, and the wireless base station or its higher-level device Estimates the installation position of the home base station according to the position information included in the measurement report message from the wireless terminal. Thereby, the installation position in the present time of a home base station can be grasped | ascertained using MDT.

  Another feature of the location estimation method according to the present invention is that, in the location estimation method according to the above feature, the predetermined trigger is an emergency call originating from a wireless terminal, periodically, or when the home base station is installed Is the gist.

  Another feature of the location estimation method according to the present invention is that, in the location estimation method according to the above feature, in the step of transmitting the measurement configuration message, the identifier of the home base station is included in the measurement configuration message and transmitted. The gist of performing the measurement is that a wireless terminal within the coverage of the home base station performs measurement for the home base station according to the identifier included in the measurement configuration message.

  Another feature of the location estimation method according to the present invention is the location estimation method according to the above feature, wherein the host device of the radio base station specifies the radio base station in which the home base station is installed in the coverage. Further, the step of transmitting the measurement configuration message is characterized in that the radio base station identified in the identifying step transmits the measurement configuration message to a radio terminal in response to the predetermined trigger.

  A feature of the radio base station according to the present invention is a radio base station (radio base station eNB) in which a home base station (home base station HeNB) is installed in the coverage of the own station, and according to a predetermined trigger, A message transmission unit (radio communication unit 110 and control unit 140) that transmits a measurement configuration message (MDT Configuration message) for instructing an immediate report type measurement to a radio terminal (radio terminal UE), and coverage of the home base station A message reception unit (radio communication unit 110) that receives a measurement report message (Measurement Report message) including a measurement result of measurement for the home base station and position information indicating a position at the time of measurement from the home wireless station ).

  Another feature of the radio base station according to the present invention is that, in the radio base station according to the above feature, the installation location of the home base station according to the location information included in the measurement report message received by the message receiver. The gist is to further include a position estimation unit (control unit 140) for estimating

  Another feature of the radio base station according to the present invention is that, in the radio base station according to the above feature, the predetermined trigger is an emergency call originating from a radio terminal, periodically, or when the home base station is installed. Is the gist.

  Another feature of the radio base station according to the present invention is summarized in that, in the radio base station according to the above feature, the message transmitting unit transmits an identifier of the home base station included in the measurement configuration message.

  ADVANTAGE OF THE INVENTION According to this invention, the position estimation method and radio | wireless base station which can grasp | ascertain the installation position in the present time of a home base station can be provided.

It is a figure which shows the whole schematic structure of the mobile communication system which concerns on embodiment of this invention. It is a block diagram which shows the structure of the wireless base station which concerns on embodiment of this invention. It is a block diagram which shows the structure of the radio | wireless terminal which concerns on embodiment of this invention. It is a figure for demonstrating the outline | summary of the position estimation method which concerns on embodiment of this invention. It is a figure for demonstrating the outline | summary of the position estimation method which concerns on embodiment of this invention. It is a sequence diagram which shows the operation pattern 1 of the position estimation method which concerns on embodiment of this invention. It is a sequence diagram which shows the operation | movement pattern 2 of the position estimation method which concerns on embodiment of this invention. It is a sequence diagram which shows the operation pattern 3 of the position estimation method which concerns on embodiment of this invention. It is a sequence diagram which shows the operation pattern 4 of the position estimation method which concerns on embodiment of this invention. It is a sequence diagram which shows the operation pattern 5 of the position estimation method which concerns on embodiment of this invention.

  Referring to the drawings, (1) an outline of a mobile communication system, (2) a configuration of a radio base station, (3) a configuration of a radio terminal, (4) a position estimation method, The effect of the embodiment will be described in the order of (6) other embodiments. In the drawings in the following embodiments, the same or similar parts are denoted by the same or similar reference numerals.

  In the following, a mobile communication system configured based on LTE (Long Term Evolution) whose specifications are established in 3GPP will be mainly described. However, it should be noted that the present invention can be applied not only to LTE but also to a mobile communication system configured based on W-CDMA (Wideband Code Division Multiple Access).

(1) Overview of Mobile Communication System FIG. 1 is a diagram illustrating an overall schematic configuration of a mobile communication system 1 according to the present embodiment.

  As shown in FIG. 1, a mobile communication system 1 includes a radio terminal UE (User Equipment), a plurality of radio base stations eNB (evolved Node-B), a maintenance monitoring device OAM (Operation and Maintenance), and a plurality of mobility management devices MME. (Mobility Management Entity) / multiple gateway devices S-GW (Serving Gateway), multiple home base stations HeNB (Home evolved Node-B), and home base station gateway HeNB GW (Home evolved Node-B Gateway).

  The radio base station eNB, the home base station HeNB, and the home base station gateway HeNB GW constitute an E-UTRAN (Evolved-UMTS Terrestrial Radio Access Network). Each radio base station eNB and each home base station HeNB manage a cell which is a communication area that should provide a service to the radio terminal UE. The geographical range of the cell is called “coverage”.

  The radio base station eNB is a macro base station having a coverage with a radius of about several hundred meters. The radio base station eNB supports MDT.

  The radio terminal UE is a radio communication device possessed by a user and is also referred to as a user device. The radio terminal UE supports MDT.

  Each adjacent radio base station eNB can communicate with each other via an X2 interface which is a logical communication path providing inter-base station communication. Each of the plurality of radio base stations eNB can communicate with an EPC (Evolved Packet Core), specifically, an MME / S-GW via the S1 interface. Each radio base station eNB can communicate with a maintenance monitoring device OAM operated by an operator.

  The mobility management device MME and / or the maintenance monitoring device OAM is a higher-level device of the radio base station eNB and the home base station HeNB, and provides information on the installation position of each radio base station eNB and information on the installation position of each home base station HeNB. to manage. Hereinafter, the mobility management device MME and the maintenance monitoring device OAM are appropriately referred to as “higher-level devices”.

  Each home base station HeNB can communicate with EPC, specifically, MME / S-GW via the S1 interface and the home base station gateway HeNB GW. The home base station HeNB is a small radio base station that has a coverage of a radius of about several meters to several tens of meters and can be installed indoors. The home base station HeNB may be moved by the user.

(2) Configuration of Radio Base Station FIG. 2 is a block diagram showing a configuration of the radio base station eNB. Here, it is assumed that the home base station HeNB is installed in the coverage of the radio base station eNB.

  As illustrated in FIG. 2, the radio base station eNB includes an antenna 101, a radio communication unit 110, a network communication unit 120, a storage unit 130, and a control unit 140.

  The antenna 101 is used for transmission / reception of a radio signal. The wireless communication unit 110 is configured using, for example, a radio frequency (RF) circuit, a baseband (BB) circuit, and the like, and transmits and receives wireless signals via the antenna 101. The wireless communication unit 110 also modulates the transmission signal and demodulates the reception signal. The network communication unit 120 communicates with other network devices (such as the maintenance monitoring device OAM and other radio base stations eNB). The storage unit 130 is configured using, for example, a memory, and stores various types of information used for controlling the radio base station eNB. The control unit 140 is configured using, for example, a CPU, and controls various functions provided in the radio base station eNB.

  The control unit 140 controls the radio communication unit 110 to transmit an MDT Configuration message (measurement configuration message) for instructing Immediate MDT to the radio terminal UE according to a predetermined trigger. The predetermined trigger is an emergency call originating from the radio terminal UE, periodically, or when the home base station HeNB is installed. The wireless communication unit 110 transmits an MDT Configuration message. In the present embodiment, the wireless communication unit 110 and the control unit 140 constitute a message transmission unit.

  The MDT Configuration message includes various measurement parameters. Specifically, the MDT Configuration message includes an identifier of the measurement target base station (measurement target cell), a parameter indicating the type of radio environment to be measured, and a parameter indicating the type of report trigger. The radio terminal UE measures the radio environment when receiving the reference signal including the identifier of the measurement target base station (measurement target cell). The type of radio environment to be measured is, for example, reference signal received power (RSRP) and reference signal received quality (RSRQ), or power headroom (PH). The type of report trigger is, for example, periodically, that the RSRP and / or RSRQ of the serving cell has dropped below a threshold value, or a radio link failure.

  In the present embodiment, the control unit 140 controls the radio communication unit 110 to transmit the identifier of the home base station HeNB as an identifier of the measurement target base station (measurement target cell) included in the MDT Configuration message. The radio communication unit 110 transmits the home base station HeNB identifier included in the MDT Configuration message.

  After transmitting the MDT Configuration message, the radio communication unit 110 receives from the radio terminal UE a Measurement Report message (measurement report message) including a measurement result of the radio environment and position information indicating a position when the measurement is performed. In the present embodiment, the wireless communication unit 110 corresponds to a message receiving unit. Here, the radio communication unit 110 includes a measurement report message including a measurement result of measurement for the home base station HeNB from the radio terminal UE within the coverage of the home base station HeNB and position information indicating a position when the measurement is performed. (Measurement report message) is received.

  The control unit 140 acquires the measurement result and the position information included in the Measurement Report message received by the wireless communication unit 110, and adds a time stamp to the measurement result and the position information. Then, the control unit 140 controls the network communication unit 120 to transmit a set of the measurement result, the position information, and the time stamp to the higher-level device. The control unit 140 is not limited to the case of transmitting this information to the host device, but may interpret the content of the information and use it for optimization of the parameters of the own station.

(3) Configuration of Radio Terminal FIG. 3 is a block diagram illustrating a configuration of the radio terminal UE.

  As illustrated in FIG. 3, the radio terminal UE includes an antenna 201, a radio communication unit 210, a user interface unit 220, a GPS receiver 230, a battery 240, a storage unit 250, and a control unit 260. However, the radio terminal UE may not have the GPS receiver 230.

  The antenna 201 is used for transmission / reception of a radio signal. The wireless communication unit 210 is configured using, for example, a radio frequency (RF) circuit, a baseband (BB) circuit, and the like, and transmits and receives a wireless signal via the antenna 201. The wireless communication unit 210 also modulates the transmission signal and demodulates the reception signal. The user interface unit 220 is a display, a button, or the like that functions as an interface with the user. The battery 240 stores electric power supplied to each block of the radio terminal UE. The storage unit 250 is configured using, for example, a memory, and stores various types of information used for controlling the radio terminal UE and the like. The control unit 260 is configured using, for example, a CPU, and controls various functions provided in the radio terminal UE.

  When the wireless communication unit 210 receives the MDT Configuration message including the measurement parameter in the connected state, the control unit 260 sets the measurement parameter included in the received MDT Configuration message. The MDT Configuration message includes an identifier of the measurement target base station (measurement target cell), a parameter indicating the type of radio environment to be measured, and a parameter indicating the type of report trigger.

  After setting the measurement parameters, the control unit 260 measures the radio environment when receiving a reference signal including the identifier of the measurement target base station (measurement target cell). In this embodiment, the identifier of the measurement target base station (measurement target cell) is the identifier of the home base station HeNB.

  The control unit 260 measures the wireless environment and generates position information indicating the position when the measurement is performed. The location information includes an ECGI (E-UTRAN Cell Global Identifier) of the serving cell. When the radio terminal UE has a positioning function, the location information further includes GNSS (Global Navigation Satellite System) location information. On the other hand, when the radio terminal UE does not have a positioning function, the location information further includes an RF (Radio frequency) fingerprint related to a reception state from a neighboring cell.

  When the measurement report message can be transmitted to the radio base station eNB after measurement of the radio environment, the control unit 260 sends the measurement report message including the measurement result to which the position information is attached according to the parameter indicating the type of the report trigger. The radio communication unit 210 is controlled to transmit to the radio base station eNB.

(4) Location Estimation Method Next, a location estimation method for estimating the installation location of the home base station HeNB will be described. 4 and 5 are diagrams for explaining the outline of the position estimation method according to the present embodiment.

  As illustrated in FIG. 4, the radio base station eNB in which the home base station HeNB is installed in the coverage of the local station sends an MDT Configuration message for instructing Immediate MDT in response to the predetermined trigger. To each wireless terminal UE. Here, the predetermined trigger is an emergency call transmission from the radio terminal UE, periodically, or when the home base station HeNB is installed.

  The radio terminal UE measures the radio environment according to the MDT Configuration message. Here, the radio terminal UE within the coverage of the home base station HeNB performs measurement for the home base station HeNB according to the identifier of the home base station HeNB included in the MDT Configuration message. And the radio | wireless terminal UE transmits the Measurement Report message containing the measurement result and the positional information which shows the position at the time of measuring to the radio base station eNB.

  FIG. 5 is a diagram in which the positions indicated by the position information included in the Measurement Report message from the radio terminal UE within the coverage of the home base station HeNB are plotted.

  As shown in FIG. 5, the position indicated by the position information included in the Measurement Report message from the radio terminal UE within the coverage of the home base station HeNB is a position around the installation position of the home base station HeNB. The center position can be estimated as the installation position of the home base station HeNB.

  In this way, the radio base station eNB or the host apparatus estimates the current installation position of the home base station HeNB according to the position information included in the Measurement Report message. Information on the current installation location of the home base station HeNB is managed in the host device and used when an emergency call is transmitted.

  Hereinafter, operation patterns 1 to 5 of the position estimation method according to the present embodiment will be described.

(4.1) Operation pattern 1
FIG. 6 is a sequence diagram showing an operation pattern 1 of the position estimation method according to the present embodiment. The operation pattern 1 is an operation pattern triggered by “emergency call transmission”.

  As shown in FIG. 6, in step S101, the home base station HeNB detects an emergency call transmission from the radio terminal UE connected to the home base station HeNB.

  In step S102, when the home base station HeNB detects an emergency call transmission, the home base station HeNB transmits an emergency call notification message for notifying the occurrence of the emergency call transmission to a higher-level device (the mobility management device MME or the maintenance monitoring device OAM). The emergency call notification message includes the identifier of the home base station HeNB and the identifier of the radio base station eNB adjacent to the home base station HeNB. Here, the identifier of the radio base station eNB adjacent to the home base station HeNB can be obtained from an adjacent base station list (so-called neighbor list) managed by the home base station HeNB.

  In step S103, when receiving the emergency call notification message, the higher-level device identifies the radio base station eNB that includes the home base station HeNB in the coverage from the identifier of the radio base station eNB included in the emergency call notification message. Then, the higher-level device transmits an MDT request message for requesting MDT to the specified radio base station eNB. At that time, the higher-level device transmits the MDT request message including the identifier of the home base station HeNB included in the emergency call notification message.

  In step S104, when receiving the MDT request message, the radio base station eNB transmits an MDT Configuration message to each radio terminal UE connected to the radio base station eNB. At that time, the radio base station eNB transmits the MDT Configuration message including the identifier of the home base station HeNB included in the MDT request message.

  In step S105, when each radio terminal UE receives the MDT Configuration message, each radio terminal UE performs measurement on the home base station HeNB according to the identifier of the home base station HeNB included in the MDT Configuration message. Specifically, each radio terminal UE measures the radio environment when receiving a reference signal including the identifier of the home base station HeNB. Each radio terminal UE generates position information indicating a position when the radio environment is measured.

  In step S106, each radio terminal UE transmits a Measurement Report message including the identifier of the home base station HeNB, the measurement result of the radio environment, and the location information to the radio base station eNB.

  In step S107, when the radio base station eNB receives the Measurement Report message, the result of adding the time stamp to the identifier of the home base station HeNB, the measurement result of the radio environment, and the position information included in the Measurement Report message Is transmitted to the upper apparatus as MDT data.

  In step S108, when receiving the MDT data, the higher-level apparatus estimates the current installation position of the home base station HeNB according to the position information included in the MDT data (that is, position information included in the Measurement Report message). Information on the current installation location of the home base station HeNB is managed in the host device and used when an emergency call is transmitted.

(4.2) Operation pattern 2
FIG. 7 is a sequence diagram showing an operation pattern 2 of the position estimation method according to the present embodiment. The operation pattern 2 is an operation pattern triggered by “periodic”.

  As illustrated in FIG. 7, in step S201, the higher-level apparatus transmits an MDT request message for requesting MDT to the radio base station eNB according to a predetermined time interval. At that time, the higher-level device transmits the identifier of the home base station HeNB included in the MDT request message.

  In step S202, when receiving the MDT request message, the radio base station eNB transmits an MDT Configuration message to each radio terminal UE connected to the own station. At that time, the radio base station eNB transmits the MDT Configuration message including the identifier of the home base station HeNB included in the MDT request message.

  In step S203, when each radio terminal UE receives the MDT Configuration message, each radio terminal UE performs measurement on the home base station HeNB according to the identifier of the home base station HeNB included in the MDT Configuration message. Specifically, each radio terminal UE measures the radio environment when receiving a reference signal including the identifier of the home base station HeNB. Each radio terminal UE generates position information indicating a position when the radio environment is measured.

  In step S204, each radio terminal UE transmits a Measurement Report message including the identifier of the home base station HeNB, the measurement result of the radio environment, and the location information to the radio base station eNB.

  In step S205, upon receiving the Measurement Report message, the radio base station eNB adds a time stamp to the identifier of the home base station HeNB, the measurement result of the radio environment, and the location information included in the Measurement Report message. Is transmitted to the upper apparatus as MDT data.

  In step S206, when receiving the MDT data, the higher-level apparatus estimates the current installation position of the home base station HeNB according to the position information included in the MDT data (that is, position information included in the Measurement Report message). Information on the current installation location of the home base station HeNB is managed in the host device and used when an emergency call is transmitted.

(4.3) Operation pattern 3
FIG. 8 is a sequence diagram showing an operation pattern 3 of the position estimation method according to the present embodiment. The operation pattern 3 is an operation pattern triggered by “at the time of installation of the home base station HeNB”.

  As shown in FIG. 8, in step S301, the home base station HeNB sends an installation notification message to notify the installation of its own station when the power is turned on after the initial installation (the mobility management device MME or the maintenance monitoring device OAM). Send to. The installation notification message includes the identifier of the home base station HeNB and the identifier of the radio base station eNB adjacent to the home base station HeNB. Here, the identifier of the radio base station eNB adjacent to the home base station HeNB can be obtained from an adjacent base station list (so-called neighbor list) set in the home base station HeNB.

  In step S302, when receiving the emergency call notification message, the higher-level apparatus identifies the radio base station eNB that includes the home base station HeNB in the coverage from the identifier of the radio base station eNB included in the emergency call notification message. Then, the higher-level device transmits an MDT request message for requesting MDT to the specified radio base station eNB. At that time, the higher-level device transmits the MDT request message including the identifier of the home base station HeNB included in the emergency call notification message.

  In step S303, when receiving the MDT request message, the radio base station eNB transmits an MDT Configuration message to each radio terminal UE connected to the own station. At that time, the radio base station eNB transmits the MDT Configuration message including the identifier of the home base station HeNB included in the MDT request message.

  In step S304, when each radio terminal UE receives the MDT Configuration message, each radio terminal UE performs measurement on the home base station HeNB according to the identifier of the home base station HeNB included in the MDT Configuration message. Specifically, each radio terminal UE measures the radio environment when receiving a reference signal including the identifier of the home base station HeNB. Each radio terminal UE generates position information indicating a position when the radio environment is measured.

  In step S305, each radio terminal UE transmits a Measurement Report message including an identifier of the home base station HeNB, a measurement result of the radio environment, and position information to the radio base station eNB.

  In step S306, upon receiving the Measurement Report message, the radio base station eNB adds a time stamp to the identifier of the home base station HeNB, the measurement result of the radio environment, and the position information included in the Measurement Report message. Is transmitted to the upper apparatus as MDT data.

  In step S307, when receiving the MDT data, the higher-level apparatus estimates the current installation position of the home base station HeNB according to the position information included in the MDT data (that is, the position information included in the Measurement Report message). Information on the current installation location of the home base station HeNB is managed in the host device and used when an emergency call is transmitted.

(4.4) Operation pattern 4
FIG. 9 is a sequence diagram showing an operation pattern 4 of the position estimation method according to the present embodiment. The operation pattern 4 is an operation pattern in which the radio base station eNB estimates the installation position of the home base station HeNB. In addition, although the case where “emergency call transmission” is a trigger will be described, “periodic” or “when the home base station HeNB is installed” may be used as a trigger.

  As illustrated in FIG. 9, in step S401, the home base station HeNB detects an emergency call transmission from the radio terminal UE connected to the home base station HeNB.

  In step S402, when the home base station HeNB detects an emergency call transmission, the home base station HeNB transmits an emergency call notification message for notifying the occurrence of the emergency call transmission to the upper apparatus (the mobility management apparatus MME or the maintenance monitoring apparatus OAM). The emergency call notification message includes the identifier of the home base station HeNB and the identifier of the radio base station eNB adjacent to the home base station HeNB. Here, the identifier of the radio base station eNB adjacent to the home base station HeNB can be obtained from an adjacent base station list (so-called neighbor list) managed by the home base station HeNB.

  In step S403, when receiving the emergency call notification message, the higher-level device identifies the radio base station eNB that includes the home base station HeNB in the coverage from the identifier of the radio base station eNB included in the emergency call notification message. Then, the higher-level device transmits an MDT request message for requesting MDT to the specified radio base station eNB. At that time, the higher-level device transmits the MDT request message including the identifier of the home base station HeNB included in the emergency call notification message.

  In step S404, when receiving the MDT request message, the radio base station eNB transmits an MDT Configuration message to each radio terminal UE connected to the own station. At that time, the radio base station eNB transmits the MDT Configuration message including the identifier of the home base station HeNB included in the MDT request message.

  In step S405, when each radio terminal UE receives the MDT Configuration message, each radio terminal UE performs measurement on the home base station HeNB according to the identifier of the home base station HeNB included in the MDT Configuration message. Specifically, each radio terminal UE measures the radio environment when receiving a reference signal including the identifier of the home base station HeNB. Each radio terminal UE generates position information indicating a position when the radio environment is measured.

  In step S406, each radio terminal UE transmits a Measurement Report message including the identifier of the home base station HeNB, the measurement result of the radio environment, and location information to the radio base station eNB.

  In step S407, when the radio base station eNB receives the Measurement Report message, the radio base station eNB estimates the current installation position of the home base station HeNB according to the position information included in the Measurement Report message. In this operation pattern, the control unit 140 of the radio base station eNB corresponds to a position estimation unit.

  In step S408, when the radio base station eNB estimates the current installation position of the home base station HeNB, the radio base station eNB transmits a position notification message including information indicating the estimated installation position to the upper apparatus. Information on the current installation location of the home base station HeNB is managed in the host device and used when an emergency call is transmitted.

(4.5) Operation pattern 5
FIG. 10 is a sequence diagram showing an operation pattern 5 of the position estimation method according to the present embodiment. In the operation pattern 5, it is assumed that an X2 interface exists between the home base station HeNB and the radio base station eNB. In addition, although the case where “emergency call transmission” is a trigger will be described, “periodic” or “when the home base station HeNB is installed” may be used as a trigger.

  As shown in FIG. 10, in step S501, the home base station HeNB detects an emergency call transmission from the radio terminal UE connected to the home base station HeNB.

  In step S502, when the home base station HeNB detects an emergency call transmission, the home base station HeNB transmits an emergency call notification message notifying the occurrence of the emergency call transmission to the radio base station eNB adjacent to the home base station HeNB via the X2 interface. To do. The emergency call notification message includes the identifier of the home base station HeNB.

  In step S503, when receiving the emergency call notification message, the radio base station eNB transmits an MDT Configuration message to each radio terminal UE connected to the own station. At that time, the radio base station eNB transmits the MDT Configuration message including the identifier of the home base station HeNB included in the emergency call notification message.

  In step S504, when each radio terminal UE receives the MDT Configuration message, each radio terminal UE performs measurement on the home base station HeNB according to the identifier of the home base station HeNB included in the MDT Configuration message. Specifically, each radio terminal UE measures the radio environment when receiving a reference signal including the identifier of the home base station HeNB. Each radio terminal UE generates position information indicating a position when the radio environment is measured.

  In step S505, each radio terminal UE transmits a Measurement Report message including the identifier of the home base station HeNB, the measurement result of the radio environment, and position information to the radio base station eNB.

  In step S506, when the radio base station eNB receives the Measurement Report message, the radio base station eNB estimates the current installation position of the home base station HeNB according to the position information included in the Measurement Report message. In this operation pattern, the control unit 140 of the radio base station eNB corresponds to a position estimation unit.

  In step S507, when the radio base station eNB estimates the current installation position of the home base station HeNB, the radio base station eNB transmits a position notification message including information indicating the estimated installation position to the upper apparatus. Information on the current installation location of the home base station HeNB is managed in the host device and used when an emergency call is transmitted.

(5) Effect of Embodiment As described above, according to the present embodiment, the radio terminal UE within the coverage of the home base station HeNB responds to the home base station HeNB according to the MDT Configuration message for indicating Immediate MDT. The radio base station eNB or its upper apparatus estimates the installation position of the home base station HeNB according to the position information included in the Measurement Report message from the radio terminal UE. Thereby, the operator can grasp | ascertain the installation position in the present time of the home base station HeNB using MDT (specifically Immediate MDT).

(6) Other Embodiments As described above, the present invention has been described according to the embodiment. However, it should not be understood that the description and drawings constituting a part of this disclosure limit the present invention. From this disclosure, various alternative embodiments, examples and operational techniques will be apparent to those skilled in the art.

  For example, the operation patterns 1 to 5 described above are not limited to the case where the operation patterns 1 and 5 are implemented separately and may be implemented using the operation patterns 1 to 5 together.

  Thus, it should be understood that the present invention includes various embodiments and the like not described herein. Therefore, the present invention is limited only by the invention specifying matters in the scope of claims reasonable from this disclosure.

  HeNB ... Home base station, HeNB GW ... Home base station gateway, MME ... Movement management device, OAM ... Maintenance monitoring device, S-GW ... Gateway device, UE ... Radio terminal, eNB ... Radio base station, 1 ... Mobile communication system, DESCRIPTION OF SYMBOLS 101 ... Antenna, 110 ... Wireless communication part, 120 ... Network communication part, 130 ... Memory | storage part, 140 ... Control part, 201 ... Antenna, 210 ... Wireless communication part, 220 ... User interface part, 230 ... GPS receiver, 240 ... Battery, 250 ... storage unit, 260 ... control unit

Claims (8)

A step in which a radio base station in which a home base station is installed in the coverage of the own station transmits a measurement configuration message for instructing immediate report type measurement to a radio terminal in response to a predetermined trigger;
A wireless terminal within the coverage of the home base station performs measurements on the home base station in response to the measurement configuration message;
A wireless terminal within the coverage of the home base station transmits a measurement report message including a measurement result and position information indicating a position when the measurement is performed to the wireless base station;
A position estimation method comprising: a step of estimating an installation position of the home base station according to the position information included in the measurement report message by the wireless base station or a higher-level device of the wireless base station.   The position estimation method according to claim 1, wherein the predetermined trigger is an emergency call from a wireless terminal, periodically, or when the home base station is installed. In the step of transmitting the measurement configuration message, the identifier of the home base station is included in the measurement configuration message and transmitted.
The position estimation according to claim 1 or 2, wherein, in the step of performing the measurement, a wireless terminal within the coverage of the home base station performs measurement for the home base station according to the identifier included in the measurement configuration message. Method. The host device of the radio base station further comprises a step of identifying the radio base station in which the home base station is installed in coverage,
4. The step of transmitting the measurement configuration message, wherein the radio base station identified in the identifying step transmits the measurement configuration message to a radio terminal according to the predetermined trigger. The position estimation method according to item. A wireless base station in which a home base station is installed within the coverage of the local station,
A message transmission unit that transmits a measurement configuration message for instructing an immediate report type measurement to the wireless terminal according to a predetermined trigger;
A radio comprising a message receiving unit for receiving a measurement report message including a measurement result of measurement for the home base station and position information indicating a position when the measurement is performed from a radio terminal within the coverage of the home base station base station.   The radio base station according to claim 5, further comprising a position estimation unit that estimates an installation position of the home base station according to the position information included in the measurement report message received by the message reception unit.   The radio base station according to claim 5 or 6, wherein the predetermined trigger is an emergency call originating from a radio terminal, periodically, or when the home base station is installed.   The radio base station according to claim 5, wherein the message transmitting unit transmits the home base station identifier included in the measurement configuration message.

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