WO2015064456A1 - Mobile communication method and wireless base station - Google Patents

Mobile communication method and wireless base station Download PDF

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Publication number
WO2015064456A1
WO2015064456A1 PCT/JP2014/078163 JP2014078163W WO2015064456A1 WO 2015064456 A1 WO2015064456 A1 WO 2015064456A1 JP 2014078163 W JP2014078163 W JP 2014078163W WO 2015064456 A1 WO2015064456 A1 WO 2015064456A1
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base station
radio base
mobile station
enb
reconnection
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PCT/JP2014/078163
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French (fr)
Japanese (ja)
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高橋　秀明
ウリ アンダルマワンティ ハプサリ
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株式会社Ｎｔｔドコモ
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/0005—Control or signalling for completing the hand-off
    • H04W36/0055—Transmission or use of information for re-establishing the radio link
    • H04W36/0079—Transmission or use of information for re-establishing the radio link in case of hand-off failure or rejection
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/24—Reselection being triggered by specific parameters
    • H04W36/30—Reselection being triggered by specific parameters by measured or perceived connection quality data
    • H04W36/305—Handover due to radio link failure

Definitions

  • the present invention relates to a mobile communication method and a radio base station.
  • X2 RLF indication (described as “X2 RLF report” in Patent Document 1), which is used in the above-described technology, is the reconnection destination radio base station T-eNB in the LTE standard specification.
  • SON Self Optimization Network
  • MRO Mobility Robustness Optimization
  • RLF Radio Link Failure
  • the radio base station eNB when configured as described above, when the “X2 RLF indication” is received, the above technology should be realized or used for SON. There was a problem that it was not possible to judge whether there was any.
  • the present invention has been made in view of the above-described problem, and even when the reconnection destination radio base station does not manage the “UE Context” related to the mobile station UE, the reconnection procedure is performed. It is an object of the present invention to provide a mobile communication method and a radio base station that can succeed in the communication.
  • a first feature of the present invention is a mobile communication method, wherein when a mobile station detects a radio link failure in a first cell under the first radio base station, the second cell selected by the cell selection process is managed.
  • the mobile station Starting a reconnection procedure for the second radio base station, in the reconnection procedure, the mobile station transmitting a reconnection request signal to the second radio base station, and the reconnection
  • the mobile station context information is sent to the first radio base station in response to the reconnection request signal.
  • the first radio base station performs the first step according to the radio link failure indication signal.
  • the radio base station and summarized in that a step of transmitting the context information of the mobile station.
  • a second feature of the present invention is that the mobile station detects a radio link failure in the first cell under the first radio base station and manages the second cell selected by the cell selection process.
  • a radio link failure indication signal including reason information indicating that the mobile station context information is to be acquired is transmitted to the first radio base station.
  • the gist of the invention is to include a transmission unit configured to do so.
  • FIG. 1 is an overall configuration diagram of a mobile communication system according to a first embodiment of the present invention.
  • FIG. 2 is a functional block diagram of the radio base station eNB # 2 according to the first embodiment of the present invention.
  • FIG. 3 is a diagram illustrating an example of a format of “X2 RLF indication” transmitted by the radio base station eNB # 2 according to the first embodiment of the present invention.
  • FIG. 4 is a sequence diagram for explaining the operation of the mobile communication system according to the first embodiment of the present invention.
  • Mobile communication system according to the first embodiment of the present invention A mobile communication system according to a first embodiment of the present invention will be described with reference to FIGS.
  • the mobile communication system according to the present embodiment is an LTE (or LTE-Advanced) mobile communication system.
  • the mobile communication system includes a mobility management node MME (Mobility Management Entity), a radio base station eNB # 1 that manages cell # 1, and a radio base station eNB # 2 that manages cell # 2. It has.
  • MME Mobility Management Entity
  • eNB # 1 Radio base station eNB # 1 that manages cell # 1
  • eNB # 2 Radio base station eNB # 2 that manages cell # 2. It has.
  • the mobile station UE detects RLF in the cell # 1 under the radio base station eNB # 1
  • the reconnection procedure for the radio base station eNB # 2 that manages the cell # 2 selected by the cell selection process An example of starting the process will be described.
  • the radio base station eNB # 2 includes a management unit 11, a reception unit 12, and a transmission unit 13.
  • the management unit 11 is configured to manage “UE Context” related to each mobile station UE.
  • the management unit 11 is configured to manage “UE Context” related to the mobile station UE transferred in the “HO Preparation process” performed by the surrounding radio base station eNB.
  • the receiving unit 12 is configured to receive various signals from the mobile station UE, and the transmitting unit 13 is configured to transmit various signals to the mobile station UE.
  • the transmission unit 13 responds to the radio base station eNB # 1 in response to the “RRC Reestablishment Request” from the mobile station UE.
  • the mobile station UE is configured to transmit “X2 RLF indication” including “RLF indication cause” indicating that it is for acquiring context information of the mobile station UE.
  • FIG. 3 shows an example of the format of “X2 RLF indication”.
  • RLF indication cause indicates that it is for acquiring context information of the mobile station UE.
  • the receiving unit 12 is configured to acquire “UE Context” related to the mobile station UE from the radio base station eNB # 1.
  • the mobile station UE when the mobile station UE detects RLF in the cell # 1 under the control of the radio base station eNB # 1 in step S1001, the mobile station UE manages the cell # 2 selected by the cell selection process in step S1002.
  • “RRCConnectionReestablishmentRequest” including “source PCI”, “source C-RNTI”, and “short MAC-I” is transmitted to the radio base station eNB # 2.
  • step S1003 the radio base station eNB # 2 transmits “X2 RLF Indication” including “source PCI”, “source C-RNTI”, and “short MAC-I” to the radio base station eNB # 1. To do.
  • step S1004 the radio base station eNB # 1 determines that the “matching process” of the “UE context” related to the mobile station UE when “context fetch” is set in the “RLF indication cause” in the “X2 RLF Indication”. And “verification processing”.
  • the radio base station eNB # 1 manages the “UE Context” related to the mobile station UE only when the “matching process” and “verification process” of the “UE Context” related to the mobile station UE are successful. Only when it is, in step S1005, “X2 HO preparation” including the security parameter is transmitted to the radio base station eNB # 2.
  • step S1006 the radio base station eNB # 2 transmits “X2 HO preparation ack” to the radio base station eNB # 1.
  • step S1007 the radio base station eNB # 2 transmits “RRCConnectionReestablishment” to the mobile station UE, and in step S1008, the mobile station UE transmits “RRCConnectionReestablishmentComplete” to the radio base station eNB # 2. To do.
  • step S1009 the radio base station eNB # 2 transmits “S1 path switch request” to the mobility management node MME.
  • step S1010 the mobility management node MME transmits to the radio base station eNB # 2. Send “S1 path switch complete”.
  • step S1011 the radio base station eNB # 2 transmits "X2 UE context release" to the radio base station eNB # 1.
  • step S1012 the radio base station eNB # 2 transmits “RRCConnectionReconfiguration” for setting SRB2, DRB, etc. to the mobile station UE.
  • step S1013 the mobile station UE transmits to the radio base station eNB # 2. Then, “RRCConnectionReconfigurationComplete” is transmitted.
  • the radio base station eNB # 2 sets “text fetch” to the “RLF indication cause” for the radio base station eNB # 1. By transmitting “X2 RLF Indication”, it is possible to acquire “UE Context” related to the mobile station UE from the radio base station eNB # 1.
  • the first feature of the present embodiment is a mobile communication method having the following steps.
  • the mobile station UE detects an RLF (radio link failure) in the cell # 1 (first cell) under the radio base station eNB # 1 (first radio base station), the mobile station UE selects by the cell selection process.
  • the reconnection procedure for the radio base station eNB # 2 (second radio base station) that manages the cell # 2 (second cell) is started.
  • the mobile station UE transmits “RRC Reestablishment Request (reconnection request signal)” to the radio base station eNB # 2.
  • the mobile base station eNB # 1 moves to the radio base station eNB # 1 according to “RRCReestablishmentRequest”.
  • X2 RLF indication radio link failure instruction signal
  • RLF indication cause radioson information
  • the radio base station eNB # 1 transmits context information of the mobile station UE to the radio base station eNB # 2 in accordance with “X2 RLF indication”.
  • the second feature of the present embodiment is a radio base station eNB configured as follows.
  • the mobile station UE detects RLF in the cell # 1 under the radio base station eNB # 1 and starts a reconnection procedure for the radio base station eNB # 2 that manages the cell # 2 selected by the cell selection process
  • the radio base station eNB that operates as the radio base station eNB # 2.
  • the radio base station eNB includes a transmission unit 13 configured to perform the following operation when the context information of the mobile station UE is not managed.
  • the transmission unit 13 In response to the “RRC Reestablishment Request” from the mobile station UE, in the reconnection procedure, the transmission unit 13 indicates to the radio base station eNB # 1 “RLF indication to indicate that it is for acquiring context information of the mobile station UE. “X2 RLF indication” including “cause” is transmitted.
  • the operations of the mobile station UE and the radio base stations eNB # 1 / eNB # 2 described above may be implemented by hardware, may be implemented by a software module executed by a processor, or a combination of both May be implemented.
  • the software modules include RAM (Random Access Memory), flash memory, ROM (Read Only Memory), EPROM (Erasable Programmable ROM), EEPROM (Electronically Erasable and Programmable, Removable ROM, Hard Disk, and Removable ROM).
  • RAM Random Access Memory
  • flash memory ROM (Read Only Memory)
  • EPROM Erasable Programmable ROM
  • EEPROM Electrically Erasable and Programmable, Removable ROM, Hard Disk, and Removable ROM.
  • it may be provided in a storage medium of an arbitrary format such as a CD-ROM.
  • the storage medium is connected to the processor so that the processor can read and write information from and to the storage medium.
  • the storage medium may be integrated in the processor.
  • the storage medium and the processor may be provided in the ASIC.
  • the ASIC may be provided in the mobile station UE and the radio base stations eNB # 1 / eNB # 2. Further, the storage medium and the processor may be provided in the mobile station UE and the radio base stations eNB # 1 / eNB # 2 as discrete components.
  • the present invention can be used to make the reconnection procedure successful when the connection-destination radio base station does not manage the context information of the mobile station UE.
  • UE ... mobile station eNB # 1, eNB # 2 ... radio base station 11 ... management unit 12 ... receiving unit 13 ... transmitting unit

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

If a mobile station (UE) detects radio link failure in a first cell served by a first wireless base station (eNB #1), said mobile station (UE) starts a reconnection procedure with respect to a second wireless base station (eNB #2) that serves a second cell that was selected by a cell selection process. In said reconnection procedure, the mobile station (UE) transmits a reconnection request signal to the second wireless base station (eNB #2), and if the second wireless base station (eNB #2) is not managing context information for the mobile station (UE), in response to the reconnection request signal, the second wireless base station (eNB #2) transmits, to the first wireless base station (eNB #1), a radio-link-failure instruction signal that contains reason information indicating that the reason therefor is to acquire context information for the mobile station (UE). In the reconnection procedure, the first wireless base station (eNB #1) transmits context information for the mobile station (UE) to the second wireless base station (eNB #2) in response to the radio-link-failure instruction signal.

Description

移動通信方法及び無線基地局Mobile communication method and radio base station
　本発明は、移動通信方法及び無線基地局に関する。 The present invention relates to a mobile communication method and a radio base station.
　ＬＴＥ（Ｌｏｎｇ　Ｔｅｒｍ　Ｅｖｏｌｕｔｉｏｎ）方式において、接続先の無線基地局が、移動局ＵＥに係る「ＵＥ　Ｃｏｎｔｅｘｔ」を管理していない場合であっても、再接続手順を成功させるための技術が知られている（例えば、特許文献１や非特許文献１参照）。 In LTE (Long Term Evolution), a technology for making the reconnection procedure successful is known even when the connection-destination radio base station does not manage the “UE Context” related to the mobile station UE. (For example, see Patent Document 1 and Non-Patent Document 1).
特開２０１３-１２９１８号公報JP 2013-12918 A
　しかしながら、上述の技術で用いられている「Ｘ２　ＲＬＦ　ｉｎｄｉｃａｔｉｏｎ（特許文献１では「Ｘ２　ＲＬＦ　ｒｅｐｏｒｔ」と記載されている）」は、ＬＴＥ方式の標準仕様では、再接続先無線基地局Ｔ-ｅＮＢが、再接続元無線基地局Ｓ-ｅＮＢに対してＲＬＦ（Ｒａｄｉｏ　Ｌｉｎｋ　Ｆａｉｌｕｒｅ）を発見したことを報告し、ハンドオーバ用パラメータを最適化するＭＲＯ（Ｍｏｂｉｌｉｔｙ　Ｒｏｂｕｓｔｎｅｓｓ　Ｏｐｔｉｍｉｓａｔｉｏｎ）等のＳＯＮ（Ｓｅｌｆ　Ｏｐｔｉｍｉｓａｔｉｏｎ　Ｎｅｔｗｏｒｋ）のために用いられるものと規定されている。 However, “X2 RLF indication” (described as “X2 RLF report” in Patent Document 1), which is used in the above-described technology, is the reconnection destination radio base station T-eNB in the LTE standard specification. For the SON (Self Optimization Network) such as MRO (Mobility Robustness Optimization) that reports RLF (Radio Link Failure) to the reconnection source radio base station S-eNB and optimizes handover parameters It is stipulated that it is used for
　したがって、無線基地局ｅＮＢが、上述の規定通りに構成されている場合、「Ｘ２　ＲＬＦ　ｉｎｄｉｃａｔｉｏｎ」を受信した場合に、上述の技術を実現すべきであるのか、或いは、ＳＯＮのために用いるべきであるかについて判断することができないという問題点があった。 Therefore, when the radio base station eNB is configured as described above, when the “X2 RLF indication” is received, the above technology should be realized or used for SON. There was a problem that it was not possible to judge whether there was any.
　そこで、本発明は、上述の課題に鑑みてなされたものであり、再接続先の無線基地局が、移動局ＵＥに係る「ＵＥ　Ｃｏｎｔｅｘｔ」を管理していない場合であっても、再接続手順を成功させることができる移動通信方法及び無線基地局を提供することを目的とする。 Therefore, the present invention has been made in view of the above-described problem, and even when the reconnection destination radio base station does not manage the “UE Context” related to the mobile station UE, the reconnection procedure is performed. It is an object of the present invention to provide a mobile communication method and a radio base station that can succeed in the communication.
　本発明の第１の特徴は、移動通信方法であって、移動局が、第１無線基地局配下の第１セルにおいて無線リンク障害を検出すると、セル選択処理によって選択された第２セルを管理する第２無線基地局に対する再接続手順を開始する工程と、前記再接続手順において、前記移動局が、前記第２無線基地局に対して、再接続要求信号を送信する工程と、前記再接続手順において、前記第２無線基地局が、前記移動局のコンテキスト情報を管理していない場合、前記再接続要求信号に応じて、前記第１無線基地局に対して、前記移動局のコンテキスト情報を取得するためである旨を示す理由情報を含む無線リンク障害指示信号を送信する工程と、前記再接続手順において、前記第１無線基地局が、前記無線リンク障害指示信号に応じて、前記第２無線基地局に対して、前記移動局のコンテキスト情報を送信する工程とを有することを要旨とする。 A first feature of the present invention is a mobile communication method, wherein when a mobile station detects a radio link failure in a first cell under the first radio base station, the second cell selected by the cell selection process is managed. Starting a reconnection procedure for the second radio base station, in the reconnection procedure, the mobile station transmitting a reconnection request signal to the second radio base station, and the reconnection In the procedure, when the second radio base station does not manage the context information of the mobile station, the mobile station context information is sent to the first radio base station in response to the reconnection request signal. In the step of transmitting a radio link failure indication signal including reason information indicating that it is for acquisition, and in the reconnection procedure, the first radio base station performs the first step according to the radio link failure indication signal. The radio base station, and summarized in that a step of transmitting the context information of the mobile station.
　本発明の第２の特徴は、移動局が、第１無線基地局配下の第１セルにおいて無線リンク障害を検出して、セル選択処理によって選択された第２セルを管理する第２無線基地局に対する再接続手順を開始した場合に、前記第２無線基地局として動作する無線基地局であって、前記無線基地局が前記移動局のコンテキスト情報を管理していない場合、前記再接続手順において、前記移動局からの前記再接続要求信号に応じて、前記第１無線基地局に対して、前記移動局のコンテキスト情報を取得するためである旨を示す理由情報を含む無線リンク障害指示信号を送信するように構成されている送信部を具備することを要旨とする。 A second feature of the present invention is that the mobile station detects a radio link failure in the first cell under the first radio base station and manages the second cell selected by the cell selection process. When the reconnection procedure for the radio base station that operates as the second radio base station and the radio base station does not manage the context information of the mobile station, In response to the reconnection request signal from the mobile station, a radio link failure indication signal including reason information indicating that the mobile station context information is to be acquired is transmitted to the first radio base station. The gist of the invention is to include a transmission unit configured to do so.
図１は、本発明の第１の実施形態に係る移動通信システムの全体構成図である。FIG. 1 is an overall configuration diagram of a mobile communication system according to a first embodiment of the present invention. 図２は、本発明の第１の実施形態に係る無線基地局ｅＮＢ＃２の機能ブロック図である。FIG. 2 is a functional block diagram of the radio base station eNB # 2 according to the first embodiment of the present invention. 図３は、本発明の第１の実施形態に係る無線基地局ｅＮＢ＃２によって送信される「Ｘ２　ＲＬＦ　ｉｎｄｉｃａｔｉｏｎ」のフォーマットの一例を示す図である。FIG. 3 is a diagram illustrating an example of a format of “X2 RLF indication” transmitted by the radio base station eNB # 2 according to the first embodiment of the present invention. 図４は、本発明の第１の実施形態に係る移動通信システムの動作を説明するためのシーケンス図である。FIG. 4 is a sequence diagram for explaining the operation of the mobile communication system according to the first embodiment of the present invention.
（本発明の第１の実施形態に係る移動通信システム）
　図１～図４を参照して、本発明の第１の実施形態に係る移動通信システムについて説明する。 (Mobile communication system according to the first embodiment of the present invention)
A mobile communication system according to a first embodiment of the present invention will be described with reference to FIGS.
　本実施形態に係る移動通信システムは、ＬＴＥ方式（或いは、ＬＴＥ-Ａｄｖａｎｃｅｄ方式）の移動通信システムである。 The mobile communication system according to the present embodiment is an LTE (or LTE-Advanced) mobile communication system.
　図１に示すように、移動通信システムは、移動管理ノードＭＭＥ（Ｍｏｂｉｌｉｔｙ　Ｍａｎａｇｅｍｅｎｔ　Ｅｎｔｉｔｙ）と、セル＃１を管理する無線基地局ｅＮＢ＃１と、セル＃２を管理する無線基地局ｅＮＢ＃２とを具備している。 As shown in FIG. 1, the mobile communication system includes a mobility management node MME (Mobility Management Entity), a radio base station eNB # 1 that manages cell # 1, and a radio base station eNB # 2 that manages cell # 2. It has.
　本実施形態では、移動局ＵＥが、無線基地局ｅＮＢ＃１配下のセル＃１においてＲＬＦを検出すると、セル選択処理によって選択されたセル＃２を管理する無線基地局ｅＮＢ＃２に対する再接続手順を開始するケースを例に挙げて説明する。 In the present embodiment, when the mobile station UE detects RLF in the cell # 1 under the radio base station eNB # 1, the reconnection procedure for the radio base station eNB # 2 that manages the cell # 2 selected by the cell selection process An example of starting the process will be described.
　図２に示すように、本実施形態に係る無線基地局ｅＮＢ＃２は、管理部１１と、受信部１２と、送信部１３とを具備している。 As illustrated in FIG. 2, the radio base station eNB # 2 according to the present embodiment includes a management unit 11, a reception unit 12, and a transmission unit 13.
　管理部１１は、各移動局ＵＥに係る「ＵＥ　Ｃｏｎｔｅｘｔ」を管理するように構成されている。 The management unit 11 is configured to manage “UE Context” related to each mobile station UE.
　具体的には、管理部１１は、周辺の無線基地局ｅＮＢによって行われる「ＨＯ　Ｐｒｅｐａｒａｔｉｏｎ処理」において転送された移動局ＵＥに係る「ＵＥ　Ｃｏｎｔｅｘｔ」を管理するように構成されている。 Specifically, the management unit 11 is configured to manage “UE Context” related to the mobile station UE transferred in the “HO Preparation process” performed by the surrounding radio base station eNB.
　受信部１２は、移動局ＵＥから各種信号を受信するように構成されており、送信部１３は、移動局ＵＥに対して各種信号を送信するように構成されている。 The receiving unit 12 is configured to receive various signals from the mobile station UE, and the transmitting unit 13 is configured to transmit various signals to the mobile station UE.
　上述の再接続手順において、管理部１１が、移動局ＵＥのコンテキスト情報を管理していない場合、移動局ＵＥからの「ＲＲＣＲｅｅｓｔａｂｌｉｓｈｍｅｎｔＲｅｑｕｅｓｔ」に応じて、送信部１３は、無線基地局ｅＮＢ＃１に対して、移動局ＵＥのコンテキスト情報を取得するためである旨を示す「ＲＬＦ　ｉｎｄｉｃａｔｉｏｎ　ｃａｕｓｅ」を含む「Ｘ２　ＲＬＦ　ｉｎｄｉｃａｔｉｏｎ」を送信するように構成されている。 In the above reconnection procedure, when the management unit 11 does not manage the context information of the mobile station UE, the transmission unit 13 responds to the radio base station eNB # 1 in response to the “RRC Reestablishment Request” from the mobile station UE. The mobile station UE is configured to transmit “X2 RLF indication” including “RLF indication cause” indicating that it is for acquiring context information of the mobile station UE.
　図３に、「Ｘ２　ＲＬＦ　ｉｎｄｉｃａｔｉｏｎ」のフォーマットの一例を示す。 FIG. 3 shows an example of the format of “X2 RLF indication”.
　ここで、「ＲＬＦ　ｉｎｄｉｃａｔｉｏｎ　ｃａｕｓｅ」に「ｃｏｎｔｅｘｔ　ｆｅｔｃｈ」が設定されている場合、「ＲＬＦ　ｉｎｄｉｃａｔｉｏｎ　ｃａｕｓｅ」は、移動局ＵＥのコンテキスト情報を取得するためである旨を示す。 Here, when “context fetch” is set in “RLF indication cause”, “RLF indication cause” indicates that it is for acquiring context information of the mobile station UE.
　「ＲＬＦ　ｉｎｄｉｃａｔｉｏｎ　ｃａｕｓｅ」に「ＭｏｂｉｌｉｔｙＲｏｂｕｓｔｎｅｓｓ」が設定されている場合、「ＲＬＦ　ｉｎｄｉｃａｔｉｏｎ　ｃａｕｓｅ」は、ＳＯＮのために用いるべきである旨を示す。 When “Mobility Robustness” is set in “RLF indication cause”, it indicates that “RLF indication cause” should be used for SON.
　なお、受信部１２は、無線基地局ｅＮＢ＃１から、移動局ＵＥに係る「ＵＥ　Ｃｏｎｔｅｘｔ」を取得するように構成されている。 The receiving unit 12 is configured to acquire “UE Context” related to the mobile station UE from the radio base station eNB # 1.
　以下、図４を参照して、本実施形態に係る移動通信システムの具体的な動作の一例について説明する。 Hereinafter, an example of a specific operation of the mobile communication system according to the present embodiment will be described with reference to FIG.
　図４に示すように、移動局ＵＥが、ステップＳ１００１において、無線基地局ｅＮＢ＃１配下のセル＃１においてＲＬＦを検出すると、ステップＳ１００２において、セル選択処理によって選択されたセル＃２を管理する無線基地局ｅＮＢ＃２に対して、「ｓｏｕｒｃｅ　ＰＣＩ」と「ｓｏｕｒｃｅ　Ｃ-ＲＮＴＩ」と「ｓｈｏｒｔ　ＭＡＣ-Ｉ」とを含む「ＲＲＣＣｏｎｎｅｃｔｉｏｎＲｅｅｓｔａｂｌｉｓｈｍｅｎｔＲｅｑｕｅｓｔ」を送信する。 As illustrated in FIG. 4, when the mobile station UE detects RLF in the cell # 1 under the control of the radio base station eNB # 1 in step S1001, the mobile station UE manages the cell # 2 selected by the cell selection process in step S1002. “RRCConnectionReestablishmentRequest” including “source PCI”, “source C-RNTI”, and “short MAC-I” is transmitted to the radio base station eNB # 2.
　ステップＳ１００３において、無線基地局ｅＮＢ＃２は、無線基地局ｅＮＢ＃１に対して、「ｓｏｕｒｃｅ　ＰＣＩ」と「ｓｏｕｒｃｅ　Ｃ-ＲＮＴＩ」と「ｓｈｏｒｔ　ＭＡＣ-Ｉ」とを含む「Ｘ２　ＲＬＦ　Ｉｎｄｉｃａｔｉｏｎ」を送信する。 In step S1003, the radio base station eNB # 2 transmits “X2 RLF Indication” including “source PCI”, “source C-RNTI”, and “short MAC-I” to the radio base station eNB # 1. To do.
　ステップＳ１００４において、無線基地局ｅＮＢ＃１は、「Ｘ２　ＲＬＦ　Ｉｎｄｉｃａｔｉｏｎ」内の「ＲＬＦ　ｉｎｄｉｃａｔｉｏｎ　ｃａｕｓｅ」に「ｃｏｎｔｅｘｔ　ｆｅｔｃｈ」が設定されている場合、移動局ＵＥに係る「ＵＥ　Ｃｏｎｔｅｘｔ」の「ｍａｔｃｈｉｎｇ処理」及び「ｖｅｒｉｆｉｃａｔｉｏｎ処理」を行う。 In step S1004, the radio base station eNB # 1 determines that the “matching process” of the “UE context” related to the mobile station UE when “context fetch” is set in the “RLF indication cause” in the “X2 RLF Indication”. And “verification processing”.
　ここで、無線基地局ｅＮＢ＃１は、移動局ＵＥに係る「ＵＥ　Ｃｏｎｔｅｘｔ」の「ｍａｔｃｈｉｎｇ処理」及び「ｖｅｒｉｆｉｃａｔｉｏｎ処理」に成功した場合にのみ、すなわち、移動局ＵＥに係る「ＵＥ　Ｃｏｎｔｅｘｔ」を管理している場合にのみ、ステップＳ１００５において、無線基地局ｅＮＢ＃２に対して、セキュリティパラメータを含む「Ｘ２　ＨＯ　ｐｒｅｐａｒａｔｉｏｎ」を送信する。 Here, the radio base station eNB # 1 manages the “UE Context” related to the mobile station UE only when the “matching process” and “verification process” of the “UE Context” related to the mobile station UE are successful. Only when it is, in step S1005, “X2 HO preparation” including the security parameter is transmitted to the radio base station eNB # 2.
　ステップＳ１００６において、無線基地局ｅＮＢ＃２は、無線基地局ｅＮＢ＃１に対して、「Ｘ２　ＨＯ　ｐｒｅｐａｒａｔｉｏｎ　ａｃｋ」を送信する。 In step S1006, the radio base station eNB # 2 transmits “X2 HO preparation ack” to the radio base station eNB # 1.
　ステップＳ１００７において、無線基地局ｅＮＢ＃２は、移動局ＵＥに対して、「ＲＲＣＣｏｎｎｅｃｔｉｏｎＲｅｅｓｔａｂｌｉｓｈｍｅｎｔ」を送信し、ステップＳ１００８において、移動局ＵＥは、無線基地局ｅＮＢ＃２に対して、「ＲＲＣＣｏｎｎｅｃｔｉｏｎＲｅｅｓｔａｂｌｉｓｈｍｅｎｔＣｏｍｐｌｅｔｅ」を送信する。 In step S1007, the radio base station eNB # 2 transmits “RRCConnectionReestablishment” to the mobile station UE, and in step S1008, the mobile station UE transmits “RRCConnectionReestablishmentComplete” to the radio base station eNB # 2. To do.
　ステップＳ１００９において、無線基地局ｅＮＢ＃２は、移動管理ノードＭＭＥに対して、「Ｓ１　ｐａｔｈ　ｓｗｉｔｃｈ　ｒｅｑｕｅｓｔ」を送信し、ステップＳ１０１０において、移動管理ノードＭＭＥは、無線基地局ｅＮＢ＃２に対して、「Ｓ１　ｐａｔｈ　ｓｗｉｔｃｈ　ｃｏｍｐｌｅｔｅ」を送信する。 In step S1009, the radio base station eNB # 2 transmits “S1 path switch request” to the mobility management node MME. In step S1010, the mobility management node MME transmits to the radio base station eNB # 2. Send “S1 path switch complete”.
　ステップＳ１０１１において、無線基地局ｅＮＢ＃２は、無線基地局ｅＮＢ＃１に対して、「Ｘ２　ＵＥ　ｃｏｎｔｅｘｔ　ｒｅｌｅａｓｅ」を送信する。 In step S1011, the radio base station eNB # 2 transmits "X2 UE context release" to the radio base station eNB # 1.
　ステップＳ１０１２において、無線基地局ｅＮＢ＃２は、移動局ＵＥに対して、ＳＲＢ２やＤＲＢ等を設定する「ＲＲＣＣｏｎｎｅｃｔｉｏｎＲｅｃｏｎｆｉｇｕｒａｔｉｏｎ」を送信し、ステップＳ１０１３において、移動局ＵＥは、無線基地局ｅＮＢ＃２に対して、「ＲＲＣＣｏｎｎｅｃｔｉｏｎＲｅｃｏｎｆｉｇｕｒａｔｉｏｎＣｏｍｐｌｅｔｅ」を送信する。 In step S1012, the radio base station eNB # 2 transmits “RRCConnectionReconfiguration” for setting SRB2, DRB, etc. to the mobile station UE. In step S1013, the mobile station UE transmits to the radio base station eNB # 2. Then, “RRCConnectionReconfigurationComplete” is transmitted.
　その結果、移動局ＵＥと無線基地局ｅＮＢ＃２（セル＃２）との間でＲＲＣコネクションが確立する。 As a result, an RRC connection is established between the mobile station UE and the radio base station eNB # 2 (cell # 2).
　本実施形態に係る移動通信システムによれば、上述の再接続手順において、無線基地局ｅＮＢ＃２が、無線基地局ｅＮＢ＃１に対して、「ＲＬＦ　ｉｎｄｉｃａｔｉｏｎ　ｃａｕｓｅ」に「ｃｏｎｔｅｘｔ　ｆｅｔｃｈ」を設定した「Ｘ２　ＲＬＦ　Ｉｎｄｉｃａｔｉｏｎ」を送信することによって、無線基地局ｅＮＢ＃１から、移動局ＵＥに係る「ＵＥ　Ｃｏｎｔｅｘｔ」を取得することができる。 According to the mobile communication system according to the present embodiment, in the reconnection procedure described above, the radio base station eNB # 2 sets “text fetch” to the “RLF indication cause” for the radio base station eNB # 1. By transmitting “X2 RLF Indication”, it is possible to acquire “UE Context” related to the mobile station UE from the radio base station eNB # 1.
　よって、無線基地局ｅＮＢ＃２において予め移動局ＵＥに係る「ＵＥ　Ｃｏｎｔｅｘｔ」が管理されていない場合であっても、上述の再接続手順を成功させることができる。 Therefore, even if the “UE Context” related to the mobile station UE is not managed in advance in the radio base station eNB # 2, the reconnection procedure described above can be made successful.
　以上に述べた本実施形態の特徴は、以下のように表現されていてもよい。 The features of the present embodiment described above may be expressed as follows.
　本実施形態の第１の特徴は、以下の工程を有する移動通信方法である。 The first feature of the present embodiment is a mobile communication method having the following steps.
　第１の工程では、移動局ＵＥが、無線基地局ｅＮＢ＃１（第１無線基地局）配下のセル＃１（第１セル）においてＲＬＦ（無線リンク障害）を検出すると、セル選択処理によって選択されたセル＃２（第２セル）を管理する無線基地局ｅＮＢ＃２（第２無線基地局）に対する再接続手順を開始する。 In the first step, when the mobile station UE detects an RLF (radio link failure) in the cell # 1 (first cell) under the radio base station eNB # 1 (first radio base station), the mobile station UE selects by the cell selection process. The reconnection procedure for the radio base station eNB # 2 (second radio base station) that manages the cell # 2 (second cell) is started.
　第２の工程では、再接続手順において、移動局ＵＥが、無線基地局ｅＮＢ＃２に対して、「ＲＲＣＲｅｅｓｔａｂｌｉｓｈｍｅｎｔＲｅｑｕｅｓｔ（再接続要求信号）」を送信する。 In the second step, in the reconnection procedure, the mobile station UE transmits “RRC Reestablishment Request (reconnection request signal)” to the radio base station eNB # 2.
　第３の工程では、再接続手順において、無線基地局ｅＮＢ＃２が、移動局ＵＥのコンテキスト情報を管理していない場合、「ＲＲＣＲｅｅｓｔａｂｌｉｓｈｍｅｎｔＲｅｑｕｅｓｔ」に応じて、無線基地局ｅＮＢ＃１に対して、移動局ＵＥのコンテキスト情報を取得するためである旨を示す「ＲＬＦ　ｉｎｄｉｃａｔｉｏｎ　ｃａｕｓｅ（理由情報）」を含む「Ｘ２　ＲＬＦ　ｉｎｄｉｃａｔｉｏｎ（無線リンク障害指示信号）」を送信する。 In the third step, when the radio base station eNB # 2 does not manage the context information of the mobile station UE in the reconnection procedure, the mobile base station eNB # 1 moves to the radio base station eNB # 1 according to “RRCReestablishmentRequest”. “X2 RLF indication (radio link failure instruction signal)” including “RLF indication cause (reason information)” indicating that the context information of the station UE is acquired is transmitted.
　第４の工程では、再接続手順において、無線基地局ｅＮＢ＃１が、「Ｘ２　ＲＬＦ　ｉｎｄｉｃａｔｉｏｎ」に応じて、無線基地局ｅＮＢ＃２に対して、移動局ＵＥのコンテキスト情報を送信する。 In the fourth step, in the reconnection procedure, the radio base station eNB # 1 transmits context information of the mobile station UE to the radio base station eNB # 2 in accordance with “X2 RLF indication”.
　本実施形態の第２の特徴は、以下のように構成されている無線基地局ｅＮＢである。 The second feature of the present embodiment is a radio base station eNB configured as follows.
　移動局ＵＥが、無線基地局ｅＮＢ＃１配下のセル＃１においてＲＬＦを検出して、セル選択処理によって選択されたセル＃２を管理する無線基地局ｅＮＢ＃２に対する再接続手順を開始した場合に、無線基地局ｅＮＢ＃２として動作する無線基地局ｅＮＢである。 When the mobile station UE detects RLF in the cell # 1 under the radio base station eNB # 1 and starts a reconnection procedure for the radio base station eNB # 2 that manages the cell # 2 selected by the cell selection process The radio base station eNB that operates as the radio base station eNB # 2.
　無線基地局ｅＮＢは、移動局ＵＥのコンテキスト情報を管理していない場合、次の動作を行うように構成されている送信部１３を具備する。 The radio base station eNB includes a transmission unit 13 configured to perform the following operation when the context information of the mobile station UE is not managed.
　送信部１３は、再接続手順において、移動局ＵＥからの「ＲＲＣＲｅｅｓｔａｂｌｉｓｈｍｅｎｔＲｅｑｕｅｓｔ」に応じて、無線基地局ｅＮＢ＃１に対して、移動局ＵＥのコンテキスト情報を取得するためである旨を示す「ＲＬＦ　ｉｎｄｉｃａｔｉｏｎ　ｃａｕｓｅ」を含む「Ｘ２　ＲＬＦ　ｉｎｄｉｃａｔｉｏｎ」を送信するように構成されている。 In response to the “RRC Reestablishment Request” from the mobile station UE, in the reconnection procedure, the transmission unit 13 indicates to the radio base station eNB # 1 “RLF indication to indicate that it is for acquiring context information of the mobile station UE. “X2 RLF indication” including “cause” is transmitted.
　なお、上述の移動局ＵＥ及び無線基地局ｅＮＢ＃１/ｅＮＢ＃２の動作は、ハードウェアによって実施されてもよいし、プロセッサによって実行されるソフトウェアモジュールによって実施されてもよいし、両者の組み合わせによって実施されてもよい。 Note that the operations of the mobile station UE and the radio base stations eNB # 1 / eNB # 2 described above may be implemented by hardware, may be implemented by a software module executed by a processor, or a combination of both May be implemented.
　ソフトウェアモジュールは、ＲＡＭ（Ｒａｎｄｏｍ　Ａｃｃｅｓｓ　Ｍｅｍｏｒｙ）や、フラッシュメモリや、ＲＯＭ（Ｒｅａｄ　Ｏｎｌｙ　Ｍｅｍｏｒｙ）や、ＥＰＲＯＭ（Ｅｒａｓａｂｌｅ　Ｐｒｏｇｒａｍｍａｂｌｅ　ＲＯＭ）や、ＥＥＰＲＯＭ（Ｅｌｅｃｔｒｏｎｉｃａｌｌｙ　Ｅｒａｓａｂｌｅ　ａｎｄ　Ｐｒｏｇｒａｍｍａｂｌｅ　ＲＯＭ）や、レジスタや、ハードディスクや、リムーバブルディスクや、ＣＤ-ＲＯＭといった任意形式の記憶媒体内に設けられていてもよい。 The software modules include RAM (Random Access Memory), flash memory, ROM (Read Only Memory), EPROM (Erasable Programmable ROM), EEPROM (Electronically Erasable and Programmable, Removable ROM, Hard Disk, and Removable ROM). Alternatively, it may be provided in a storage medium of an arbitrary format such as a CD-ROM.
　記憶媒体は、プロセッサが当該記憶媒体に情報を読み書きできるように、当該プロセッサに接続されている。記憶媒体は、プロセッサに集積されていてもよい。また、記憶媒体及びプロセッサは、ＡＳＩＣ内に設けられていてもよい。ＡＳＩＣは、移動局ＵＥ及び無線基地局ｅＮＢ＃１/ｅＮＢ＃２内に設けられていてもよい。また、記憶媒体及びプロセッサは、ディスクリートコンポーネントとして移動局ＵＥ及び無線基地局ｅＮＢ＃１/ｅＮＢ＃２内に設けられていてもよい。 The storage medium is connected to the processor so that the processor can read and write information from and to the storage medium. The storage medium may be integrated in the processor. The storage medium and the processor may be provided in the ASIC. The ASIC may be provided in the mobile station UE and the radio base stations eNB # 1 / eNB # 2. Further, the storage medium and the processor may be provided in the mobile station UE and the radio base stations eNB # 1 / eNB # 2 as discrete components.
　以上、上述の実施形態を用いて本発明について詳細に説明したが、当業者にとっては、本発明が本明細書中に説明した実施形態に限定されるものではないということは明らかである。本発明は、請求の範囲の記載により定まる本発明の趣旨及び範囲を逸脱することなく修正及び変更態様として実施することができる。従って、本明細書の記載は、例示説明を目的とするものであり、本発明に対して何ら制限的な意味を有するものではない。 As described above, the present invention has been described in detail using the above-described embodiments. However, it is obvious for those skilled in the art that the present invention is not limited to the embodiments described in the present specification. The present invention can be implemented as modifications and changes 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.
　なお、日本国特許出願第２０１３-２２７０１５号（２０１３年１０月３１日出願）の全内容が、参照により、本願明細書に組み込まれている。 Note that the entire contents of Japanese Patent Application No. 2013-227015 (filed on October 31, 2013) are incorporated herein by reference.
　本発明は、接続先の無線基地局が、移動局ＵＥのコンテキスト情報を管理していない場合に、再接続手順を成功させるために利用できる。 The present invention can be used to make the reconnection procedure successful when the connection-destination radio base station does not manage the context information of the mobile station UE.
ＵＥ…移動局
ｅＮＢ＃１、ｅＮＢ＃２…無線基地局
１１…管理部
１２…受信部
１３…送信部 UE ... mobile station eNB # 1, eNB # 2 ... radio base station 11 ... management unit 12 ... receiving unit 13 ... transmitting unit

Claims (2)

  1. 　移動局が、第１無線基地局配下の第１セルにおいて無線リンク障害を検出すると、セル選択処理によって選択された第２セルを管理する第２無線基地局に対する再接続手順を開始する工程と、
    　前記再接続手順において、前記移動局が、前記第２無線基地局に対して、再接続要求信号を送信する工程と、
    　前記再接続手順において、前記第２無線基地局が、前記移動局のコンテキスト情報を管理していない場合、前記再接続要求信号に応じて、前記第１無線基地局に対して、前記移動局のコンテキスト情報を取得するためである旨を示す理由情報を含む無線リンク障害指示信号を送信する工程と、
    　前記再接続手順において、前記第１無線基地局が、前記無線リンク障害指示信号に応じて、前記第２無線基地局に対して、前記移動局のコンテキスト情報を送信する工程と、
    　を有することを特徴とする移動通信方法。     When the mobile station detects a radio link failure in the first cell under the first radio base station, starting a reconnection procedure for the second radio base station managing the second cell selected by the cell selection process;
    In the reconnection procedure, the mobile station transmits a reconnection request signal to the second radio base station;
    In the reconnection procedure, when the second radio base station does not manage the context information of the mobile station, the mobile station transmits the mobile station to the first radio base station according to the reconnection request signal. Transmitting a radio link failure indication signal including reason information indicating that it is for acquiring context information;
    In the reconnection procedure, the first radio base station transmits context information of the mobile station to the second radio base station in response to the radio link failure indication signal;
    A mobile communication method comprising:
  2. 　移動局が、第１無線基地局配下の第１セルにおいて無線リンク障害を検出して、セル選択処理によって選択された第２セルを管理する第２無線基地局に対する再接続手順を開始した場合に、前記第２無線基地局として動作する無線基地局であって、
    　前記無線基地局が前記移動局のコンテキスト情報を管理していない場合、前記再接続手順において、前記移動局からの前記再接続要求信号に応じて、前記第１無線基地局に対して、前記移動局のコンテキスト情報を取得するためである旨を示す理由情報を含む無線リンク障害指示信号を送信するように構成されている送信部を具備することを特徴とする無線基地局。     When the mobile station detects a radio link failure in the first cell under the first radio base station and starts a reconnection procedure for the second radio base station managing the second cell selected by the cell selection process A radio base station operating as the second radio base station,
    If the radio base station does not manage the context information of the mobile station, the mobile station moves the mobile station to the first radio base station according to the reconnection request signal from the mobile station in the reconnection procedure. A radio base station, comprising: a transmission unit configured to transmit a radio link failure indication signal including reason information indicating that the station context information is to be acquired.
PCT/JP2014/078163 2013-10-31 2014-10-23 Mobile communication method and wireless base station WO2015064456A1 (en)

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