JP2011223121A - Mobile communication method and radio base station - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a mobile communication method that can have a subject mobile station UE continue to measure and report a desired radio quality, even when the subject mobile station UE performs hand-over.SOLUTION: A mobile communication method according to the present invention includes a process in which a radio base station eNB #1 notifies a radio base station eNB #2 of a subject mobile station UE and a MDT policy, and a process in which the radio base station eNB #2 instructs the subject mobile station UE to perform a MDT based on the MDT policy.

Description

  The present invention relates to a mobile communication method and a radio base station.

  In a conventional mobile communication system, a telecommunications carrier measures and investigates radio quality in each area by performing a “Drive Test” in order to improve radio quality.

3GPP TR36.805, “Evolved Universal Terrestrial Radio Access (E-UTRA); Study on minimization of drive-tests in next generation networks” 3GPP TS 37.320, “Radio measurement collection for MDT”

  However, in the “Drive Test”, the telecommunications carrier measures and investigates the radio quality in all areas, finds the problem area, and improves the radio quality based on the measurement and survey results of the radio quality. There was a problem that it was necessary to do it and high cost was required.

  In order to solve such a problem, 3GPP discusses a technique called “MDT (Minimization of Drive Tests)” that causes a target mobile station UE to measure and report desired radio quality.

  Here, in 3GPP, how to continue “MDT” when the target mobile station UE performs handover has not been studied yet.

  Therefore, the present invention has been made in view of the above problems, and a mobile communication method and a radio that can continuously measure and report desired radio quality even when the target mobile station UE performs handover. The purpose is to provide a base station.

  A first feature of the present invention is that when a target mobile station is caused to measure and report desired radio quality, the target mobile station changes from a cell under the first radio base station to a cell under the second radio base station. A mobile communication method for performing handover, wherein the first radio base station notifies the second radio base station of the target mobile station and the measurement and reporting method of the desired radio quality; The wireless base station includes a step of instructing the target mobile station to perform measurement and reporting of the desired wireless quality based on the measurement and reporting method of the desired wireless quality.

  The second feature of the present invention is that when the target mobile station is caused to measure and report the desired radio quality, the target mobile station changes from a cell under the first radio base station to a cell under the second radio base station. In a mobile communication method for performing handover, a radio base station functioning as the second radio base station, wherein the first radio base station is notified of the target mobile station and the method for measuring and reporting the desired radio quality And an instruction unit configured to instruct the target mobile station to perform measurement and reporting of the desired radio quality based on the measurement and reporting method of the desired radio quality. And

  The third feature of the present invention is that when the target mobile station is caused to measure and report desired radio quality, the target mobile station changes from a cell under the first radio base station to a cell under the second radio base station. A mobile communication method for performing handover, in which an exchange station notifies the second radio base station of the target mobile station and the measurement and reporting method of the desired radio quality, and the second radio base station And a step of instructing the target mobile station to perform measurement and reporting of the desired radio quality based on the measurement and reporting method of the desired radio quality.

  According to a fourth aspect of the present invention, when the target mobile station is caused to measure and report the desired radio quality, the target mobile station changes from a cell under the first radio base station to a cell under the second radio base station. In a mobile communication method for performing handover, a radio base station that functions as the second radio base station, and the target mobile station and the desired radio quality measurement and reporting method are notified from an exchange station when the target mobile station and the desired radio quality measurement and reporting method are notified The gist of the present invention is to include an instruction unit configured to instruct a mobile station to perform measurement and reporting of desired radio quality based on the measurement and reporting method of desired radio quality.

  The fifth feature of the present invention is that when the target mobile station is caused to measure and report the desired radio quality, the target mobile station changes from a cell under the first radio base station to a cell under the second radio base station. A mobile communication method for performing handover, wherein the first radio base station notifies the second radio base station of the target mobile station and the measurement and reporting method of the desired radio quality; When the measurement and reporting method of the desired radio quality is set in advance by the radio base station, the measurement of the desired radio quality notified from the first radio base station to the target mobile station and And a step of instructing the measurement and reporting of the desired radio quality based on the measurement and reporting method of the desired radio quality set in advance instead of the reporting method.

  A sixth feature of the present invention is that when the target mobile station is caused to measure and report the desired radio quality, the target mobile station changes from a cell under the first radio base station to a cell under the second radio base station. In the mobile communication method for performing handover, a radio base station that functions as the second radio base station, wherein the target mobile station and the measurement and reporting method of the desired radio quality are notified from the first radio base station. Even when the method for measuring and reporting the desired radio quality is set in advance, the measurement and reporting of the desired radio quality notified from the first radio base station to the target mobile station. And an instruction unit configured to instruct to perform measurement and reporting of the desired radio quality based on a measurement and reporting method of the desired radio quality that is set in advance. And

  A seventh feature of the present invention is that when the target mobile station is caused to measure and report the desired radio quality, the target mobile station changes from a cell under the first radio base station to a cell under the second radio base station. A mobile communication method for performing handover, in which an exchange station notifies the second radio base station of the target mobile station and the measurement and reporting method of the desired radio quality, and the second radio base station If the desired radio quality measurement and reporting method is set in advance, the desired mobile quality measurement and reporting method notified from the switching center to the target mobile station, not the desired radio quality measurement and reporting method in advance. And a step of instructing to perform measurement and reporting of the desired radio quality based on the set measurement and reporting method of the desired radio quality.

  The eighth feature of the present invention is that when the target mobile station is caused to measure and report the desired radio quality, the target mobile station changes from a cell under the first radio base station to a cell under the second radio base station. In the mobile communication method to be handed over, a radio base station that functions as the second radio base station, even when the target mobile station and the measurement and reporting method of the desired radio quality are notified from an exchange station, If the desired radio quality measurement and reporting method is set in advance, the target mobile station is set in advance instead of the desired radio quality measurement and reporting method notified from the exchange. The gist of the present invention is to provide an instruction unit configured to instruct to perform measurement and reporting of the desired radio quality based on the measurement and reporting method of the desired radio quality.

  As described above, according to the present invention, it is possible to provide a mobile communication method and a radio base station that can continuously measure and report desired radio quality even when the target mobile station UE performs handover. Can do.

1 is an overall configuration diagram of a mobile communication system according to a first embodiment of the present invention. FIG. 3 is a functional block diagram of a radio base station according to the first embodiment of the present invention. FIG. 3 is a sequence diagram showing an operation of the mobile communication system according to the first embodiment of the present invention. It is a sequence diagram which shows operation | movement of the mobile communication system which concerns on the 2nd Embodiment of this invention. It is a sequence diagram which shows operation | movement of the mobile communication system which concerns on the 3rd Embodiment of this invention. It is a sequence diagram which shows operation | movement of the mobile communication system which concerns on the 4th Embodiment of this invention.

  The configuration of the mobile communication system according to the first embodiment of the present invention will be described with reference to FIGS.

  As shown in FIG. 1, the mobile communication system according to the present embodiment includes an exchange MME (Mobility Management Entity), a radio base station eNB # 1, and a radio base station eNB # 2.

  The mobile communication system according to the present embodiment is configured to be able to perform “MDT” that causes the target mobile station UE to measure and report desired radio quality. As “MDT” that can be performed in the mobile communication system according to the present embodiment, two types of “Immediate MDT” and “Logged MDT” are assumed.

  Here, “Immediate MDT” is “MDT” which causes the target mobile station UE in the RRC_Connected state (Active state) to measure and report the desired radio quality. In 3GPP, it is considered that the definition of “Immediate MDT” is determined by extending the existing “Measurement” specification.

  For example, in “Immediate MDT”, the target mobile station UE in the RRC_Connected state reports a measurement result of desired radio quality when a reporting condition defined by “Reporting Configuration (Event, Period, etc.)” is satisfied. It may be configured.

  On the other hand, “Logged MDT” is “MDT” which causes the target mobile station UE in the RRC_Idle state to measure and report desired radio quality.

  For example, in “Logged MDT”, the target mobile station UE in the RRC_Idle state stores the measurement result of the desired radio quality and reports the measurement result when transitioning to the RRC_Connected state. Good.

  In this embodiment, the mobile station UE is a target mobile station UE that is to perform “MDT”, and performs handover from a cell under the radio base station eNB # 1 to a cell under the radio base station eNB # 2. Will be described below.

  As illustrated in FIG. 2, the radio base station eNB that functions as the radio base station eNB # 2 includes a reception unit 11 and an instruction unit 12.

  The receiving unit 11 is configured to receive various signals transmitted by the first radio base station eNB # 1 and the exchange MME.

  The instruction unit 12 indicates that the mobile station UE should perform “MDT” when “HO Request” is received by the reception unit 11 and based on “MDT Policy” included in the “HO Request”. When it is determined, it is configured to include “HO Command” including “MDT measurement and reporting configuration” including information necessary for performing “MDT” in the “HO Request ACK” and transmit it to the mobile station UE. .

  Here, “MDT policy” defines information requesting the mobile station UE to perform “MDT”, and a method of performing “MDT” (that is, a method of measuring and reporting desired radio quality). For example, information including “MDT measurement type”, “MDT measurement area”, “MDT measurement item”, and the like.

  For example, “MDT measurement type” is information indicating either “Immediate MDT” or “Logged MDT”.

  “MDT measurement area” is information indicating a location where desired radio quality is measured, and is, for example, cell identification information (cell ID) or geographical area identification information.

  Further, the “MDT measurement item” is information indicating desired radio quality, for example, information indicating measurement RAT (Radio Access Technology) and measurement frequency, information indicating the type of radio quality indicating RSRP or RSRQ, The report condition (Event, Period, etc.) of the measurement result of desired radio quality is included.

  Note that “MDT measurement item” for “Immediate MDT” and “MDT measurement item” for “Logged MDT” may indicate different contents.

  Hereinafter, the operation of the mobile communication system according to the present embodiment will be described with reference to FIG.

  As illustrated in FIG. 3, in step S1001, the radio base station eNB # 1 transmits “HO Request” including “MDT policy” applied in the mobile station UE to the radio base station eNB # 2. .

  In step S1002, the radio base station eNB # 2 transmits “HO Request ACK” addressed to the mobile station UE to the radio base station eNB # 1.

  Here, the radio base station eNB # 2 includes “MDT policy” determined based on “MDT policy” included in “HO Request” in “HO Request ACK”.

  In step S1003, the radio base station eNB # 1 transmits “HO Command” including the “MDT policy” to the mobile station UE.

  According to the mobile communication system according to the present embodiment, the desired radio quality can be continuously measured and reported even when the mobile station UE is handed over.

  In addition, although this embodiment demonstrated the case where the mobile station UE performed X2 handover, this invention is applicable similarly when the mobile station UE performs S1 handover.

(Mobile communication system according to the second embodiment of the present invention)
With reference to FIG. 4, the structure of the mobile communication system which concerns on the 2nd Embodiment of this invention is demonstrated. Hereinafter, the mobile communication system according to the present embodiment will be described by focusing on differences from the mobile communication system according to the first embodiment described above.

  As illustrated in FIG. 4, in step S2001, the radio base station eNB # 1 transmits “HO Request” related to the mobile station UE to the radio base station eNB # 2.

  In step S2002, the radio base station eNB # 2 transmits “HO Request ACK” addressed to the mobile station UE to the radio base station eNB # 1, and in step S2003, the radio base station eNB # 1 This “HO Request ACK” is forwarded to the UE.

  In step S2004, the mobile station UE transmits “HO Confirm” to the radio base station eNB # 2, and in step S2005, the radio base station eNB # 2 sends “Path Switch Request” to the switching center MME. ".

  In step S2006, the switching center MME transmits “Path Switch Request ACK” including “MDT policy” applied in the mobile station UE to the radio base station eNB # 2.

  In step S2007, the radio base station eNB # 2 transmits “MDT measurement and reporting configuration” including setting information for performing “MDT” to the mobile station UE.

  Here, the radio base station eNB # 2 includes “MDT policy” determined based on “MDT policy” included in “Path Switch Request ACK” in “MDT measurement and reporting configuration”.

  According to the mobile communication system according to the present embodiment, the desired radio quality can be continuously measured and reported even when the mobile station UE is handed over.

  In addition, although this embodiment demonstrated the case where the mobile station UE performed X2 handover, this invention is applicable similarly when the mobile station UE performs S1 handover.

(Mobile communication system according to the third embodiment of the present invention)
With reference to FIG. 5, the structure of the mobile communication system which concerns on the 3rd Embodiment of this invention is demonstrated. Hereinafter, the mobile communication system according to the present embodiment will be described by focusing on differences from the mobile communication system according to the first embodiment described above.

  As illustrated in FIG. 5, in step S3001, the radio base station eNB # 1 transmits “HO Request” including “MDT policy” applied by the mobile station UE to the radio base station eNB # 2. .

  In step S3002, the radio base station eNB # 2 transmits “HO Request ACK” addressed to the mobile station UE to the radio base station eNB # 1.

  Here, when “MDT policy” is set in advance in the radio base station eNB # 2, the radio base station eNB # 2 moves based on the “MDT policy” set in advance. “HO Command” including “MDT measurement and reporting configuration” is included in “HO Request ACK” for the station UE.

  In step S3003, the radio base station eNB # 1 transmits “HO Command” including “MDT measurement and Reporting configuration” to the mobile station UE based on “MDT policy” set in advance.

  According to the mobile communication system according to the present embodiment, the desired radio quality can be continuously measured and reported even when the mobile station UE is handed over.

  In addition, although this embodiment demonstrated the case where the mobile station UE performed X2 handover, this invention is applicable similarly when the mobile station UE performs S1 handover.

(Mobile communication system according to the fourth embodiment of the present invention)
With reference to FIG. 6, the structure of the mobile communication system which concerns on the 4th Embodiment of this invention is demonstrated. Hereinafter, the mobile communication system according to the present embodiment will be described by focusing on differences from the mobile communication system according to the first embodiment described above.

  As shown in FIG. 6, the operations in steps S4001 to S4005 are the same as the operations in steps S2001 to S2005 shown in FIG.

  In step S4006, the switching center MME transmits “Path Switch Request ACK” including “MDT policy” applied by the mobile station UE to the radio base station eNB # 2.

  In step S4007, the radio base station eNB # 2 transmits “MDT measurement and reporting configuration” including setting information for performing “MDT” to the mobile station UE.

  Here, the radio base station eNB # 2 is configured in the “Path Switch Request ACK” transmitted by the switching center MME when “MDT policy” is set in the radio base station eNB # 2 in advance. When “MDT policy” is included, “MDT measurement and reporting configuration” is transmitted to the mobile station UE based on the “MDT policy” included in the “Path Switch Request ACK”. May be.

  In addition, the radio base station eNB # 2 has the “MDT policy” set in advance in the radio base station eNB # 2, and the “Path Switch Request ACK” transmitted by the switching center MME contains “ When the “MDT policy” is not included, “MDT measurement and reporting configuration” may be transmitted to the mobile station UE based on the “MDT Policy” set in advance.

  Further, transmission of “MDT policy” by the switching center MME and transmission of “MDT measurement and reporting configuration” from the radio base station eNB # 2 to the mobile station UE may be performed after the handover procedure of the mobile station UE is completed. Good.

  According to the mobile communication system according to the present embodiment, the desired radio quality can be continuously measured and reported even when the mobile station UE is handed over.

  In addition, although this embodiment demonstrated the case where the mobile station UE performed X2 handover, this invention is applicable similarly when the mobile station UE performs S1 handover.

  The features of the embodiment described above may be expressed as follows.

  The first feature of the present embodiment is that when the target mobile station UE is caused to measure and report the desired radio quality, the target mobile station UE is a cell under the radio base station eNB # 1 (first radio base station). Is a mobile communication method for performing handover to a cell under the control of a radio base station eNB # 2 (second radio base station), wherein the radio base station eNB # 1 The step of notifying “MDT policy (desired radio quality measurement and reporting method)”, and the radio base station eNB # 2 notifies the target mobile station UE of “MDT (desired radio quality) based on the“ MDT policy ”. And a step of instructing to carry out measurement and reporting).

  The second feature of the present embodiment is that, when the target mobile station UE causes the target mobile station UE to measure and report the desired radio quality, the target mobile station UE starts from the cell under the radio base station eNB # 1 to the radio base station eNB # 2. In a mobile communication method for performing handover to a subordinate cell, a radio base station eNB that functions as a radio base station eNB # 2, and the target mobile station UE and “MDT policy” are notified from the radio base station eNB # 1 Furthermore, the gist of the present invention is to include an instruction unit 12 configured to instruct the target mobile station UE to perform “MDT” based on the “MDT policy”.

  The third feature of the present embodiment is that, when the target mobile station UE causes the target mobile station UE to measure and report the desired radio quality, the target mobile station UE starts from the cell under the radio base station eNB # 1 to the radio base station eNB # 2. A mobile communication method for handing over to a subordinate cell, wherein the switching center MME notifies the radio base station eNB # 2 of the target mobile station UE and “MDT policy”, and the radio base station eNB # 2 And a step of instructing the target mobile station UE to perform “MDT” based on the “MDT policy”.

  The fourth feature of the present embodiment is that, when the target mobile station UE causes the target mobile station UE to measure and report the desired radio quality, the target mobile station UE starts from the cell under the radio base station eNB # 1 and is transmitted to the radio base station eNB # 2. In the mobile communication method for handing over to a subordinate cell, a radio base station eNB that functions as the radio base station eNB # 2, and when the target mobile station UE and “MDT policy” are notified from the switching center MME, The gist is to include an instruction unit 12 configured to instruct the mobile station UE to perform “MDT” based on the “MDT policy”.

  The fifth feature of the present embodiment is that, when the target mobile station UE causes the target mobile station UE to measure and report the desired radio quality, the target mobile station UE starts from the cell under the radio base station eNB # 1 to the radio base station eNB # 2. A mobile communication method for performing handover to a subordinate cell, in which the radio base station eNB # 1 notifies the radio base station eNB # 2 of the target mobile station UE and “MDT policy”; and the radio base station eNB When #MDT policy is set in advance in # 2, it is set in advance for the target mobile station UE, not “MDT policy” notified from the radio base station eNB # 1. And a step of instructing to perform “MDT” based on “MDT policy”.

  A sixth feature of the present embodiment is that, when the target mobile station UE is caused to measure and report the desired radio quality, the target mobile station UE starts from the cell under the radio base station eNB # 1 and is transmitted to the radio base station eNB # 2. In the mobile communication method for handing over to a subordinate cell, a radio base station eNB that functions as the radio base station eNB # 2, when the target mobile station UE and “MDT policy” are notified from the radio base station eNB # 1 Even if “MDT policy” is set in advance, it is set in advance for the target mobile station UE, not “MDT policy” notified from the radio base station eNB # 1. The gist is to include an instruction unit 12 configured to instruct to perform “MDT” based on “MDT policy”.

  The seventh feature of the present embodiment is that, when the target mobile station UE is caused to measure and report the desired radio quality, the target mobile station UE starts from the cell under the radio base station eNB # 1 and is transmitted to the radio base station eNB # 2. A mobile communication method for handing over to a subordinate cell, wherein the switching center MME notifies the radio base station eNB # 2 of the target mobile station UE and “MDT policy”, and the radio base station eNB # 2 , When “MDT policy” is set in advance, it is based on “MDT policy” set in advance instead of “MDT policy” notified from the exchange MME to the target mobile station UE. And a step of instructing to perform “MDT”.

  The eighth feature of the present embodiment is that, when the target mobile station UE causes the target mobile station UE to measure and report the desired radio quality, the target mobile station UE starts from the cell under the radio base station eNB # 1 to the radio base station eNB # 2. In the mobile communication method for handing over to a subordinate cell, even if the radio base station eNB functions as the radio base station eNB # 2 and “MDT policy” is notified from the switching center MME, “MDT policy” Is set in advance, not “MDT policy” notified from the switching center MME to the target mobile station UE, but “MDT” based on the “MDT policy” set in advance. The gist is to include an instruction unit 12 configured to instruct to perform the operation.

  Note that the operations of the mobile station UE, the radio base station eNB, and the switching center MME described above may be implemented by hardware, may be implemented by a software module executed by a processor, or may be implemented by a combination of both. May be.

  The software module includes a RAM (Random Access Memory), a flash memory, a ROM (Read Only Memory), an EPROM (Erasable Programmable ROM), an EEPROM (Electronically Erasable and Programmable ROM, a hard disk, a registerable ROM, a hard disk). Alternatively, it may be provided in a storage medium of an arbitrary format such as a CD-ROM.

  Such a storage medium is connected to the processor so that the processor can read and write information from and to the storage medium. Further, such a storage medium may be integrated in the processor. Such a storage medium and processor may be provided in the ASIC. Such an ASIC may be provided in the mobile station UE, the radio base station eNB, or the exchange MME. Further, the storage medium and the processor may be provided as a discrete component in the mobile station UE, the radio base station eNB, or the exchange MME.

  Although the present invention has been described in detail using the above-described embodiments, it is obvious to those skilled in the art that the present invention is not limited to the embodiments described in this specification. The present invention can be implemented as modified and changed modes without departing from the spirit and scope of the present invention defined by the description of the scope of claims. Therefore, the description of the present specification is for illustrative purposes and does not have any limiting meaning to the present invention. Therefore, the description of the present specification is for illustrative purposes and does not have any limiting meaning to the present invention.

UE ... mobile station MME ... exchange eNB ... radio base station 11 ... receiving unit 12 ... instruction unit

Claims (8)

A mobile communication method in which a target mobile station is handed over from a cell under the first radio base station to a cell under the second radio base station when the target mobile station is made to measure and report the desired radio quality,
The first radio base station notifying the second radio base station of the target mobile station and the measurement and reporting method of the desired radio quality;
The second radio base station instructing the target mobile station to perform measurement and reporting of the desired radio quality based on the measurement and reporting method of the desired radio quality. Mobile communication method. In the mobile communication method in which when the target mobile station is caused to measure and report the desired radio quality, the target mobile station performs handover from the cell under the first radio base station to the cell under the second radio base station. 2 a radio base station that functions as a radio base station,
When the target mobile station and the desired radio quality measurement and report method are notified from the first radio base station, the target mobile station is notified of the desired radio quality measurement and report method based on the desired radio quality measurement and report method. A radio base station comprising an instruction unit configured to instruct to perform measurement and report of desired radio quality. A mobile communication method in which a target mobile station is handed over from a cell under the first radio base station to a cell under the second radio base station when the target mobile station is made to measure and report the desired radio quality,
A switching station notifying the second radio base station of the target mobile station and the desired radio quality measurement and reporting method;
The second radio base station instructing the target mobile station to perform measurement and reporting of the desired radio quality based on the measurement and reporting method of the desired radio quality. Mobile communication method. In the mobile communication method in which when the target mobile station is caused to measure and report the desired radio quality, the target mobile station performs handover from the cell under the first radio base station to the cell under the second radio base station. 2 a radio base station that functions as a radio base station,
When the target mobile station and the measurement and reporting method of the desired radio quality are notified from the switching center, the target radio station is notified of the desired radio quality based on the measurement and reporting method of the desired radio quality. A radio base station comprising an instruction unit configured to instruct to perform measurement and report. A mobile communication method in which a target mobile station is handed over from a cell under the first radio base station to a cell under the second radio base station when the target mobile station is made to measure and report the desired radio quality,
The first radio base station notifying the second radio base station of the target mobile station and the measurement and reporting method of the desired radio quality;
When the measurement method and report method of the desired radio quality are set in advance by the second radio base station, the desired radio quality notified from the first radio base station to the target mobile station And a step of instructing the measurement and reporting of the desired radio quality based on the measurement and reporting method of the desired radio quality set in advance instead of the measurement and reporting method of Communication method. In the mobile communication method in which when the target mobile station is caused to measure and report the desired radio quality, the target mobile station performs handover from the cell under the first radio base station to the cell under the second radio base station. 2 a radio base station that functions as a radio base station,
Even when the target mobile station and the measurement and reporting method of the desired radio quality are notified from the first radio base station, the measurement and reporting method of the desired radio quality is set in advance. The target mobile station is not based on the desired radio quality measurement and reporting method notified from the first radio base station, but based on the preset desired radio quality measurement and reporting method. A radio base station comprising an instruction unit configured to instruct to perform measurement and report of desired radio quality. A mobile communication method in which a target mobile station is handed over from a cell under the first radio base station to a cell under the second radio base station when the target mobile station is made to measure and report the desired radio quality,
A switching station notifying the second radio base station of the target mobile station and the desired radio quality measurement and reporting method;
In the case where the measurement and reporting method for the desired radio quality is preset in the second radio base station, the measurement of the desired radio quality notified from the exchange to the target mobile station and And a step of instructing the measurement and reporting of the desired radio quality based on the measurement and reporting method of the desired radio quality set in advance instead of the reporting method. In the mobile communication method in which when the target mobile station is caused to measure and report the desired radio quality, the target mobile station performs handover from the cell under the first radio base station to the cell under the second radio base station. 2 a radio base station that functions as a radio base station,
Even when the target mobile station and the measurement and reporting method of the desired radio quality are notified from the switching center, if the measurement and reporting method of the desired radio quality is set in advance, the target mobile The measurement and reporting of the desired radio quality based on the measurement and reporting method of the desired radio quality set in advance, instead of the measurement and reporting method of the desired radio quality notified from the exchange to the station A radio base station comprising an instruction unit configured to instruct to perform the operation.

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