JP2013005102A - Radio base station and communication method - Google Patents

Radio base station and communication method Download PDF

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JP2013005102A
JP2013005102A JP2011132397A JP2011132397A JP2013005102A JP 2013005102 A JP2013005102 A JP 2013005102A JP 2011132397 A JP2011132397 A JP 2011132397A JP 2011132397 A JP2011132397 A JP 2011132397A JP 2013005102 A JP2013005102 A JP 2013005102A
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JP5599369B2 (en
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Masaya Maeda
昌也 前田
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Mitsubishi Electric Corp
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Abstract

PROBLEM TO BE SOLVED: To obtain a radio base station performing cooperative operation by selecting a radio base station with which information necessary for cooperative operation can be exchanged within a predetermined delay time.SOLUTION: The radio base station (eNB 21) includes a function of setting a channel for transmitting/receiving information necessary for handover control of a mobile terminal (UE 3) and a cooperation function of performing radio transmission and reception in cooperation with another radio base station. In the operation of setting the channel for transmitting/receiving information necessary for handover control to/from an adjacent base station (eNB 22), when exchanging information for channel setting, the radio base station also exchanges control information to perform radio transmission/reception in cooperation with the adjacent base station, channel information for cooperative operation to exchange data and information to measure a transmission delay. Further, the radio base station measures transmission delay in the channel for cooperative operation, and based on the measurement result, determines whether radio transmission/reception is to be performed in cooperation with the adjacent base station.

Description

本発明は、複数のセル間で協調して無線送受信を行う無線通信システムを構成する無線基地局および通信方法に関する。   The present invention relates to a radio base station and a communication method that constitute a radio communication system that performs radio transmission and reception in cooperation between a plurality of cells.

３ＧＰＰ（3rd Generation Partnership Project）で規格化が進められているＬＴＥ−Ａｄｖａｎｃｅｄ（Long Term Evolution-Advanced）システムでは、複数のセル間で協調して無線送受信を行うＣｏＭＰ（Coordinated MultiPoint transmission/reception）がサポートされる。ＣｏＭＰには、（１）データを複数のセルから同時または選択的に送信するＪＰ（Joint Processing）、（２）あるセルにおけるスケジューリングやビームフォーミングを他のセルで考慮し、当該セルのデータ送信利得が向上するようにするＣＳ／ＣＢ（Coordinated Scheduling/Coordinated Beamforming）、の２つの送信モードがある（非特許文献１）。いずれの送信モードにおいても、基地局間で情報を共有するために高速な基地局間回線が必要となる。   The LTE-Advanced (Long Term Evolution-Advanced) system, which is being standardized by 3GPP (3rd Generation Partnership Project), supports CoMP (Coordinated MultiPoint transmission / reception) that performs wireless transmission and reception in cooperation between multiple cells. Is done. CoMP includes (1) JP (Joint Processing) in which data is transmitted simultaneously or selectively from a plurality of cells, and (2) data transmission gain of the cell in consideration of scheduling and beamforming in a certain cell in other cells. There are two transmission modes of CS / CB (Coordinated Scheduling / Coordinated Beamforming) that improve the frequency (Non-Patent Document 1). In any transmission mode, a high-speed inter-base station line is required to share information between base stations.

ＬＴＥ−Ａｄｖａｎｃｅシステム及びその前身のＬＴＥシステムでは、端末に隣接セルを検出・報告させ、当該隣接セルを形成する基地局との間でハンドオーバ制御を行うための基地局間インタフェースを自動的に設定するＡＮＲ（Automatic Neighbor Relation）機能が規定されている（非特許文献２，非特許文献３）。   In the LTE-Advanced system and its predecessor LTE system, a terminal detects and reports a neighboring cell, and automatically configures an interface between base stations for performing handover control with the base station forming the neighboring cell. An ANR (Automatic Neighbor Relation) function is defined (Non-Patent Document 2, Non-Patent Document 3).

特許文献１に記載の発明では、ＡＮＲ機能によって端末に検出・報告させた隣接セルについて、当該隣接セルにおける接続端末数、端末における当該隣接セルの受信信号強度、端末の報告回数等に基づいてＣｏＭＰを行う隣接セルの集合（CoMP Cooperating Set）を決定し、ＣｏＭＰを行う隣接セルを形成する基地局との間でＣｏＭＰ実施可否，実施可能な上記ＣｏＭＰモードの交渉を行うようにすることで、CoMP Cooperating Setの設定及びＣｏＭＰに必要な基地局間インタフェースの設定が自動的に行えるようにしている。   In the invention described in Patent Document 1, CoMP based on the number of connected terminals in the neighboring cell, the received signal strength of the neighboring cell in the terminal, the number of times of reporting of the terminal, etc. By determining a set of neighboring cells (CoMP Cooperating Set) to perform CoMP and negotiating whether or not CoMP can be performed with the base station forming the neighboring cell performing CoMP, the above CoMP mode can be negotiated. Cooperating Set settings and inter-base station interface settings required for CoMP can be automatically performed.

国際公開第２０１１／０１６５６０号International Publication No. 2011/016560

“３ＧＰＰ ＴＲ ３６．８１４” Ver.9.0.0 (2010-03-30)“3GPP TR 36.814” Ver.9.0.0 (2010-03-30) “３ＧＰＰ ＴＳ ３６．４１３” Ver.9.5.1 (2011-01-06)“3GPP TS 36.413” Ver.9.5.1 (2011-01-06) “３ＧＰＰ ＴＳ ３６．４２３” Ver.9.5.0 (2010-12-21)“3GPP TS 36.423” Ver.9.5.0 (2010-12-21)

ＣｏＭＰでは端末が複数のセルと送受信を行うために十分な無線通信品質を維持できる必要がある一方で、端末と通信する複数のセルを形成する複数の基地局間でＣｏＭＰに必要な制御情報を所定の遅延時間以内に交換できなければならない。そのため、CoMP Cooperation Setの構成時には、端末による隣接セルとの無線通信品質の測定のみならず、端末と通信中の基地局と、CoMP Cooperation Setに追加しようとしている基地局の間の回線が、ＣｏＭＰを行うのに十分な伝送特性を有しているか否かを検証する必要がある。   While it is necessary for CoMP to be able to maintain sufficient wireless communication quality for a terminal to perform transmission / reception with a plurality of cells, control information necessary for CoMP is transmitted between a plurality of base stations forming a plurality of cells communicating with the terminal. It must be replaceable within a predetermined delay time. Therefore, when configuring the CoMP Cooperation Set, not only the measurement of the wireless communication quality with the neighboring cell by the terminal, but also the line between the base station in communication with the terminal and the base station to be added to the CoMP Cooperation Set It is necessary to verify whether or not the transmission characteristics are sufficient to perform the transmission.

本発明は、上記に鑑みてなされたものであって、ＡＮＲ機能において端末に検出された隣接する無線基地局のうち、ＣｏＭＰのために共有する必要がある情報を所定の遅延時間以内に交換可能な無線基地局を選択してＣｏＭＰを行う無線基地局および通信方法を得ることを目的とする。   The present invention has been made in view of the above, and information that needs to be shared for CoMP can be exchanged within a predetermined delay time among adjacent radio base stations detected by a terminal in the ANR function. An object of the present invention is to obtain a radio base station and a communication method that perform CoMP by selecting an appropriate radio base station.

上述した課題を解決し、目的を達成するために、本発明は、隣接している無線基地局である隣接基地局が配下の移動端末により検出された場合に当該移動端末のハンドオーバ制御で必要な情報を送受信するための回線を当該隣接基地局との間で設定する機能、および他の無線基地局と協調して無線送受信を行う協調機能を有する無線基地局であって、前記ハンドオーバ制御で必要な情報を送受信するための回線を隣接基地局との間で設定する動作において、当該回線設定のための情報を交換する際に、当該隣接基地局と協調して無線送受信を行う場合の制御情報やデータを交換するための協調動作用回線の情報および当該協調動作用回線における伝送遅延測定のための情報も併せて交換し、さらに、当該協調動作用回線における伝送遅延を測定し、当該測定結果に基づいて、前記隣接基地局と協調して無線送受信を行うか否かを判定することを特徴とする。   In order to solve the above-described problems and achieve the object, the present invention is necessary for handover control of a mobile terminal when an adjacent base station that is an adjacent radio base station is detected by a subordinate mobile terminal. A radio base station having a function of setting a line for transmitting / receiving information with the adjacent base station and a cooperative function of performing radio transmission / reception in cooperation with other radio base stations, which is necessary for the handover control. Control information when wireless transmission / reception is performed in cooperation with the adjacent base station when exchanging information for setting the line in the operation of setting a line for transmitting / receiving various information with the adjacent base station. Information on the cooperative operation line for exchanging data and information for transmission delay measurement on the cooperative operation line is also exchanged, and the transmission delay on the cooperative operation line is measured. And, based on the measurement result, and judging whether or not to perform radio transmission and reception in cooperation with the neighboring base station.

本発明によれば、協調動作を行うのに十分な伝送特性の回線を設定可能な隣接セル（協調動作で必要な情報を所定時間以内に交換可能な隣接基地局）を対象として協調動作を行う無線基地局を実現できるという効果を奏する。   According to the present invention, a cooperative operation is performed for adjacent cells (adjacent base stations capable of exchanging information necessary for the cooperative operation within a predetermined time) capable of setting a line having transmission characteristics sufficient to perform the cooperative operation. There is an effect that a radio base station can be realized.

図１は、本願発明にかかる無線基地局を備えた無線通信システムの構成例を示す図である。FIG. 1 is a diagram illustrating a configuration example of a wireless communication system including a wireless base station according to the present invention. 図２は、従来のＡＮＲ機能による装置間インタフェース確立手順を示す図である。FIG. 2 is a diagram showing a procedure for establishing an interface between devices using a conventional ANR function. 図３は、本願発明にかかる無線基地局による装置間インタフェース確立手順の一例を示す図である。FIG. 3 is a diagram showing an example of an inter-device interface establishment procedure by the radio base station according to the present invention.

以下に、本発明にかかる無線基地局および通信方法の実施の形態を図面に基づいて詳細に説明する。なお、この実施の形態によりこの発明が限定されるものではない。   Hereinafter, embodiments of a radio base station and a communication method according to the present invention will be described in detail with reference to the drawings. Note that the present invention is not limited to the embodiments.

実施の形態．
図１は、本願発明にかかる無線基地局を備えた無線通信システムの構成例を示す図である。本実施の形態では、無線通信システムが３ＧＰＰ ＬＴＥあるいはＬＴＥ−Ａｄｖａｎｃｅｄシステムの場合におけるCoMP Cooperation Set構成方法について説明する。 Embodiment.
FIG. 1 is a diagram illustrating a configuration example of a wireless communication system including a wireless base station according to the present invention. In this embodiment, a CoMP Cooperation Set configuration method when the wireless communication system is a 3GPP LTE or LTE-Advanced system will be described.

図１に示したように、本実施の形態の無線通信システムは、コアネットワーク装置（ＭＭＥ）１１および１２と無線基地局（ｅＮＢ）２１および２２を備えている。また、ｅＮＢ２１，ｅＮＢ２２は、それぞれ、無線通信エリアであるセル（Ｃｅｌｌ）４１，４２を形成している。移動端末（ＵＥ）３は、セル４１においてｅＮＢ２１と無線通信を行っている。セル４２はセル４１に隣接しており、ＵＥ３は、ｅＮＢ２１とｅＮＢ２２の間でハンドオーバ処理を行うことで、通信を維持しながらセル４１からセル４２へ、あるいはセル４２からセル４１へ移動することができる。   As shown in FIG. 1, the radio communication system of the present embodiment includes core network devices (MME) 11 and 12 and radio base stations (eNBs) 21 and 22. In addition, the eNB 21 and the eNB 22 form cells (Cells) 41 and 42, which are wireless communication areas, respectively. The mobile terminal (UE) 3 performs radio communication with the eNB 21 in the cell 41. The cell 42 is adjacent to the cell 41, and the UE 3 can move from the cell 41 to the cell 42 or from the cell 42 to the cell 41 while maintaining communication by performing a handover process between the eNB 21 and the eNB 22. it can.

ｅＮＢ２１とｅＮＢ２２は協調し、セル４１およびセル４２とＵＥ３との間でＣｏＭＰを行うことができるものとする。しかし今、ｅＮＢ２１はセル４２が自セル（セル４１）に隣接していることを把握しておらず、ＵＥ３をセル４１からセル４２へハンドオーバさせることも、ｅＮＢ２２との間でＣｏＭＰを行うこともできないものとする。   The eNB 21 and the eNB 22 cooperate to perform CoMP between the cell 41 and the cell 42 and the UE 3. However, the eNB 21 does not know that the cell 42 is adjacent to the own cell (cell 41), and the UE 3 can be handed over from the cell 41 to the cell 42 or can perform CoMP with the eNB 22. It shall not be possible.

ｅＮＢ２１は上位のＭＭＥ１１と装置間インタフェース１０１で接続されている。同様にｅＮＢ２２はＭＭＥ１２と装置間インタフェース１０２で接続されている。ＭＭＥ１１およびＭＭＥ１２は各々図示されていない複数の無線基地局（ｅＮＢ）と接続され、移動端末（ＵＥ）の在圏情報の管理，着信処理，移動端末に提供するサービスに応じたユーザデータ（音声，ビデオストリーム，パケット等）の経路制御等を行う。ＭＭＥ１１とＭＭＥ１２は装置間インタフェース１０３で接続されており、装置間インタフェース１０１〜１０３を介してｅＮＢ２１とｅＮＢ２２が間接的に通信することによりセル４１−セル４２間のハンドオーバ制御を行うこともできる。ＭＭＥ１１とＭＭＥ１２はＵＥ３に関する情報の引き継ぎを行う際にもインタフェース１０３を使用する。   The eNB 21 is connected to the host MME 11 via the inter-device interface 101. Similarly, the eNB 22 is connected to the MME 12 via the inter-device interface 102. The MME 11 and the MME 12 are each connected to a plurality of radio base stations (eNBs) not shown in the figure, manage the area information of the mobile terminal (UE), receive processing, and user data according to the service provided to the mobile terminal (voice, Video stream, packet, etc.) are routed. The MME 11 and the MME 12 are connected by the inter-device interface 103, and the handover control between the cell 41 and the cell 42 can be performed by the eNB 21 and the eNB 22 communicating indirectly via the inter-device interfaces 101 to 103. The MME 11 and the MME 12 also use the interface 103 when taking over information related to the UE 3.

ＬＴＥ／ＬＴＥ−ＡｄｖａｎｃｅｄシステムにおけるＡＮＲ機能はＵＥ３が検出した隣接セル４２をセル４１の隣接セルとして追加し、ｅＮＢ２１とｅＮＢ２２の間の装置間インタフェース１０４（図１参照）を確立する。ここで、ＡＮＲ機能により装置間インタフェース１０４を確立させる場合の従来の手順について、図２を用いて説明する。   The ANR function in the LTE / LTE-Advanced system adds the adjacent cell 42 detected by the UE 3 as an adjacent cell of the cell 41, and establishes an inter-device interface 104 (see FIG. 1) between the eNB 21 and the eNB 22. Here, a conventional procedure when the inter-device interface 104 is established by the ANR function will be described with reference to FIG.

隣接しているセルを形成しているｅＮＢ間で装置間インタフェースを確立させる場合の従来の手順では、まず、ＵＥ３が、在圏しているセル４１の隣接セル４２上で送信されている報知チャネルの受信品質（例えば受信電力）を測定するとともに、報知チャネル上で送信されているセル４２の広域セルＩＤと位置登録エリアＩＤ（以下、これらをセル情報と呼ぶ）を取得する（ステップＳ１）。   In the conventional procedure for establishing an inter-device interface between eNBs forming adjacent cells, first, the broadcast channel transmitted by the UE 3 on the adjacent cell 42 of the cell 41 in which the UE 3 is located. And the wide area cell ID and location registration area ID (hereinafter referred to as cell information) of the cell 42 transmitted on the broadcast channel are acquired (step S1).

次に、ＵＥ３は、上記ステップＳ１で測定・取得した受信品質・セル情報を、ＭＥＡＳＵＲＥＭＥＮＴ ＲＥＰＯＲＴ（メッセージ）にて、無線通信中のｅＮＢ２１に報告する（ステップＳ２）。   Next, the UE 3 reports the reception quality / cell information measured / acquired in step S1 to the eNB 21 in wireless communication using a MEASUREMENT REPORT (message) (step S2).

ＵＥ３から上記報告を受けたｅＮＢ２１は、ＵＥ３から受信したセル４２の受信品質・セル情報からセル４２を自セル（セル４１）の隣接セルリストに加えるか否かを判定する。判定方法については様々な実装が考えられ、例えば、受信品質または同様の情報と、情報の受信回数とにしきい値を設け、受信品質等がしきい値以上を示している情報を所定回数にわたって連続して受信した場合に隣接セルリストに加えるようにすることができる。隣接セルリストに加えることとした場合、ｅＮＢ２１は、ＵＥ３から受信した広域セルＩＤを確認してセル４２を形成しているｅＮＢ２２の基地局ＩＤを取得する。さらに、取得したｅＮＢ２２の基地局ＩＤをＵＥ３から受信した位置登録エリアＩＤと共に、ｅＮＢ ＣＯＮＦＩＧＵＲＡＴＩＯＮ ＴＲＡＮＳＦＥＲにてＭＭＥ１１へ送信する。このｅＮＢ ＣＯＮＦＩＧＵＲＡＴＩＯＮ ＴＲＡＮＳＦＥＲには、基地局ＩＤで特定される基地局（ｅＮＢ２２）に対してｅＮＢ２１が装置間インタフェース１０４を確立するための情報を要求する、ＳＣＴＰエンドポイント情報要求も含ませる（ステップＳ３）。   The eNB 21 that has received the report from the UE 3 determines whether or not to add the cell 42 to the neighboring cell list of the own cell (cell 41) from the reception quality / cell information of the cell 42 received from the UE 3. Various implementations are possible for the determination method. For example, a threshold is set for the reception quality or similar information and the number of times the information is received, and information indicating that the reception quality or the like is equal to or greater than the threshold is continuously applied for a predetermined number of times Can be added to the neighbor cell list. When it is decided to add to the neighbor cell list, the eNB 21 confirms the wide area cell ID received from the UE 3 and acquires the base station ID of the eNB 22 forming the cell 42. Furthermore, base station ID of acquired eNB22 is transmitted to MME11 by eNB CONFIGURATION TRANSFER together with location registration area ID received from UE3. The eNB CONFIGURATION TRANSFER includes an SCTP endpoint information request for requesting information for the eNB 21 to establish the inter-device interface 104 to the base station (eNB 22) specified by the base station ID (step S3). .

ｅＮＢ２１から上記メッセージを受信したＭＭＥ１１は、当該メッセージに含まれる位置登録エリアＩＤを確認して当該メッセージを転送すべきＭＭＥを特定し、特定したＭＭＥであるＭＭＥ１２に対して、ＣＯＮＦＩＧＵＲＡＴＩＯＮ ＴＲＡＮＳＦＥＲ ＴＵＮＮＥＬとしてメッセージ（基地局ＩＤ，位置登録エリアＩＤ）を転送する（ステップＳ４）。   MME11 which received the said message from eNB21 confirms the location registration area ID contained in the said message, specifies MME which should transfer the said message, with respect to MME12 which is the specified MME, message as CONFIGURATION TRANSFER TUNEL ( The base station ID and the location registration area ID) are transferred (step S4).

ＭＭＥ１１により転送された上記メッセージを受信したＭＭＥ１２は、当該メッセージをＭＭＥ ＣＯＮＦＩＧＵＲＡＴＩＯＮ ＴＲＡＮＳＦＥＲとしてｅＮＢ２２へ転送する（ステップＳ５）。   MME12 which received the said message transferred by MME11 transfers the said message to eNB22 as MME CONFIGURATION TRANSFER (step S5).

ＭＭＥ１２により転送された上記メッセージを受信したｅＮＢ２２は、ｅＮＢ２１とインタフェース１０４を確立するために必要なｅＮＢ２２側のＳＣＴＰエンドポイント情報（ＩＰアドレス，ＳＣＴＰポート番号）をｅＮＢ ＣＯＮＦＩＧＵＲＡＴＩＯＮ ＴＲＡＮＳＦＥＲにてＭＭＥ１２へ送信する（ステップＳ６）。   The eNB 22 that has received the message forwarded by the MME 12 transmits the SCTP endpoint information (IP address, SCTP port number) on the eNB 22 side necessary for establishing the interface 104 with the eNB 21 to the MME 12 by the eNB CONFIGURATION TRANSFER ( Step S6).

ｅＮＢ２２から上記メッセージを受信したＭＭＥ１２は、当該メッセージをＣＯＮＦＩＧＵＲＡＴＩＯＮ ＴＲＡＮＳＦＥＲ ＴＵＮＮＥＬとしてＭＭＥ１１へ転送する（ステップＳ７）。   MME12 which received the said message from eNB22 transfers the said message to MME11 as CONFIGURATION TRANSFER TUNEL (step S7).

ＭＭＥ１２により転送された上記メッセージを受信したＭＭＥ１１は、当該受信したメッセージをＭＭＥ ＣＯＮＦＩＧＵＲＡＴＩＯＮ ＴＲＡＮＳＦＥＲとしてｅＮＢ２１へ転送する（ステップＳ８）。   MME11 which received the said message transferred by MME12 transfers the said received message to eNB21 as MME CONFIGURATION TRANSFER (step S8).

ＭＭＥ１１により転送された上記メッセージを受信し、上記ｅＮＢ２２から送信された装置間インタフェース１０４を確立させるための情報（ｅＮＢ２２側のＳＣＴＰエンドポイント情報）を取得したｅＮＢ２１は、この情報を用いてｅＮＢ２２との間で装置間インタフェース１０４を確立する（ステップＳ９）。   The eNB 21 that has received the message transferred by the MME 11 and acquired the information for establishing the inter-device interface 104 transmitted from the eNB 22 (the SCTP endpoint information on the eNB 22 side) uses this information to communicate with the eNB 22 The inter-device interface 104 is established between them (step S9).

ｅＮＢ２１は、さらに、確立した装置間インタフェース１０４を介して、セル４２に対する隣接セル情報（セル４１のセル情報）をｅＮＢ２２に通知する（ステップＳ１０）。   The eNB 21 further notifies the eNB 22 of neighboring cell information (cell information of the cell 41) for the cell 42 via the established inter-device interface 104 (step S10).

ｅＮＢ２２は、ｅＮＢ２１から上記隣接セル情報を受信すると、インタフェース１０４を介して、セル４１に対する隣接セル情報（セル４２のセル情報）をｅＮＢ２１に通知する（ステップＳ１１）。   When receiving the neighboring cell information from the eNB 21, the eNB 22 notifies the eNB 21 of neighboring cell information (cell information of the cell 42) for the cell 41 via the interface 104 (step S <b> 11).

以上のようにして、従来のＬＴＥ／ＬＴＥ−Ａｄｖａｎｃｅｄシステムでは、ＡＮＲ機能により隣接セル情報の交換および基地局間インタフェース１０４の確立を自動的に行う。   As described above, in the conventional LTE / LTE-Advanced system, the exchange of neighboring cell information and the establishment of the inter-base station interface 104 are automatically performed by the ANR function.

次に、図１および図３を用いて、本実施の形態の無線通信システムにおけるCoMP Cooperation Setの構成手順を説明する。なお、図３は、本実施の形態の無線通信システムにおけるＡＮＲ機能を利用したCoMP Cooperation Setの構成手順の一例を示す図である。この図３においては、図２に示した処理と同じ処理に同じステップ番号を付している。図２と同じステップ番号の処理については説明を省略する。   Next, the configuration procedure of the CoMP Cooperation Set in the radio communication system of the present embodiment will be described using FIG. 1 and FIG. FIG. 3 is a diagram illustrating an example of a configuration procedure of the CoMP Cooperation Set using the ANR function in the radio communication system according to the present embodiment. In FIG. 3, the same steps as those shown in FIG. 2 are assigned the same step numbers. Description of the processing of the same step number as in FIG. 2 is omitted.

本実施の形態の無線通信システムにおいて、ｅＮＢ２１は、ステップＳ２でＵＥ３から送信されたセル情報および受信品質情報を受信すると、従来のＡＮＲ機能（図２のステップＳ３参照）と同様の情報、すなわち、基地局ＩＤ，位置登録エリアＩＤ，ＳＣＴＰ（Stream Control Transmission Protocol）エンドポイント情報要求を含み、さらに、遅延測定要求を含んだｅＮＢ２２宛のメッセージをｅＮＢ ＣＯＮＦＩＧＵＲＡＴＩＯＮ ＴＲＡＮＳＦＥＲとしてＭＭＥ１１へ送信する（ステップＳ３ａ）。遅延測定要求は、ｅＮＢ２１とｅＮＢ２２の間でＣｏＭＰを行う際の制御情報およびデータの交換で使用する回線の情報とこの回線の伝送遅延を測定する手段に関する情報とを含む。ＣｏＭＰを行う際の制御情報およびデータの交換で使用する回線の情報には、例えば、ｅＮＢ２１側のＩＰアドレスと伝送プロトコル（ＳＣＴＰ(Stream Control Transmission Protocol)やＧＴＰ(GPRS Tunneling Protocol)等）のポート番号や識別子の組を含める。また、伝送遅延を測定する手段に関する情報には、例えば、ｅＮＢ２１が使用可能な遅延測定方法（ＰＩＮＧ(Packet Internet Groper)、ＮＴＰ(Network Time Protocol)、固定メッセージの交換による測定等、既存の伝送遅延手段）のリストを含める。更にＣｏＭＰ実施時に制御情報やデータを交換する回線と遅延測定に使用する回線が異なる場合には、伝送測定手段に関する情報の一部として、当該回線遅延測定用の回線情報（ＩＰアドレスやプロトコルポート番号・識別子等）を含める。   In the radio communication system of the present embodiment, when the eNB 21 receives the cell information and reception quality information transmitted from the UE 3 in step S2, the same information as the conventional ANR function (see step S3 in FIG. 2), that is, A message addressed to the eNB 22 including the base station ID, location registration area ID, SCTP (Stream Control Transmission Protocol) endpoint information request, and further including a delay measurement request is transmitted to the MME 11 as an eNB CONFIGURATION TRANSFER (step S3a). The delay measurement request includes control information when performing CoMP between the eNB 21 and the eNB 22, information on a line used for data exchange, and information on a means for measuring the transmission delay of the line. The control information used for CoMP and the line information used for data exchange include, for example, the IP address on the eNB 21 side and the port number of a transmission protocol (such as SCTP (Stream Control Transmission Protocol) or GTP (GPRS Tunneling Protocol)) Or a set of identifiers. The information on the means for measuring the transmission delay includes, for example, a delay measurement method that can be used by the eNB 21 (PING (Packet Internet Groper), NTP (Network Time Protocol), measurement by exchanging fixed messages, etc.) A list of means). Further, when the line for exchanging control information and data at the time of CoMP and the line used for delay measurement are different, as part of the information on the transmission measurement means, the line information for measuring the line delay (IP address or protocol port number). Include identifier etc.)

ｅＮＢ２２は、上記ステップＳ３ａでｅＮＢ２１から送信された情報を受信すると、従来のＡＮＲ機能（図２のステップＳ６参照）と同様の情報、すなわち、基地局ＩＤ，位置登録エリアＩＤ，ＳＣＴＰエンドポイント情報要求を含み、さらに、遅延測定応答を含んだｅＮＢ２１宛のメッセージをｅＮＢ ＣＯＮＦＩＧＵＲＡＴＩＯＮ ＴＲＡＮＳＦＥＲとしてＭＭＥ１２へ送信する（ステップＳ６ａ）。遅延測定応は、上記のステップＳ３ａで送信されるメッセージの遅延測定要求と同様に、ｅＮＢ２２側のＣｏＭＰ実施時の制御情報およびデータの交換で使用する回線の情報とこの回線の伝送遅延を測定する手段に関する情報とを含む。   When the eNB 22 receives the information transmitted from the eNB 21 in step S3a, the same information as the conventional ANR function (see step S6 in FIG. 2), that is, the base station ID, the location registration area ID, and the SCTP endpoint information request And a message addressed to the eNB 21 including the delay measurement response is transmitted to the MME 12 as an eNB CONFIGURATION TRANSFER (step S6a). In the delay measurement, the control information at the time of CoMP execution on the eNB 22 side and the information on the line used for exchanging data and the transmission delay of this line are measured in the same manner as the message delay measurement request transmitted in step S3a. Information about the means.

ｅＮＢ２１は、上記ステップＳ６ａでｅＮＢ２２から送信された情報を受信すると、受信した遅延測定応答に含まれるｅＮＢ２２側のＣｏＭＰ実施時の制御情報およびデータの交換で使用する回線の情報とこの回線の伝送遅延を測定する手段に関する情報とに基づき、伝送遅延測定方法を決定し、伝送遅延測定の対象となる回線（複数あっても良い）に対して伝送遅延を測定する（ステップＳ２１）。測定の結果、伝送遅延が所定値（しきい値）よりも大きい場合、ｅＮＢ２１は、ｅＮＢ２２との間でＣｏＭＰ実施不可と判定し、CoMP Cooperation SetにｅＮＢ２２（セル４２）を追加しない。一方、測定の結果伝送遅延が所定値よりも小さい場合、ｅＮＢ２２との間でＣｏＭＰ実施可と判定し、CoMP Cooperation SetにｅＮＢ２２（セル４２）を追加する。   When the eNB 21 receives the information transmitted from the eNB 22 in the above step S6a, the control information at the time of CoMP implementation on the eNB 22 side included in the received delay measurement response and the information on the line used for exchanging data and the transmission delay of this line The transmission delay measurement method is determined on the basis of the information on the means for measuring the transmission delay, and the transmission delay is measured for the line (or a plurality of transmission delay measurement targets) (step S21). If the transmission delay is larger than the predetermined value (threshold value) as a result of the measurement, the eNB 21 determines that CoMP cannot be performed with the eNB 22 and does not add the eNB 22 (cell 42) to the CoMP Cooperation Set. On the other hand, when the transmission delay is smaller than the predetermined value as a result of the measurement, it is determined that CoMP can be performed with the eNB 22, and the eNB 22 (cell 42) is added to the CoMP Cooperation Set.

ｅＮＢ２１は、上記ステップＳ２１でｅＮＢ２２をCoMP Cooperation Setに追加した場合、さらに、ｅＮＢ２２との間でＣｏＭＰに用いる制御情報・データ交換用回線として、装置間インタフェース１０４を確立する（ステップＳ９ａ）。この回線は制御情報交換用およびデータ交換用にそれぞれ個別に確立しても良いし、同一でも良い。また、従来ハンドオーバ制御のためにｅＮＢ２１とｅＮＢ２２の間で確立していた回線と同一であっても良い。上記ステップＳ２１でｅＮＢ２２をCoMP Cooperation Setに追加しなかった場合、本ステップは従来のＡＮＲ機能（図２のステップＳ９）と同様となる。   When the eNB 21 is added to the CoMP Cooperation Set in step S21, the eNB 21 further establishes the inter-device interface 104 as a control information / data exchange line used for CoMP with the eNB 22 (step S9a). This line may be individually established for control information exchange and data exchange, or may be the same. Moreover, it may be the same as the line established between eNB 21 and eNB 22 for conventional handover control. If the eNB 22 is not added to the CoMP Cooperation Set in step S21, this step is the same as the conventional ANR function (step S9 in FIG. 2).

以降の処理は、従来と同様である。なお、ステップＳ１０においてｅＮＢ２１からｅＮＢ２２に対してＣｏＭＰ実施または非実施を通知するようにしても良い。また、ＣｏＭＰを実施する場合、ステップＳ１０〜Ｓ１１において、ＣｏＭＰで使用する送信モードの交渉をｅＮＢ２１とｅＮＢ２２の間で行っても良い。   Subsequent processing is the same as in the prior art. In step S10, the eNB 21 may notify the eNB 22 of CoMP execution or non-execution. Moreover, when implementing CoMP, you may negotiate the transmission mode used by CoMP between eNB21 and eNB22 in step S10-S11.

このように、本実施の形態の無線通信システムにおけるCoMP Cooperation Setの自動構成手順では、ＡＮＲ機能によりＵＥ３が検出・報告した隣接セルを形成する基地局に対し、ＣｏＭＰ実施時に制御情報やデータを交換するために使用する回線の情報および当該回線の遅延を測定するための手段の情報を要求し、その応答として通知された回線情報および回線遅延測定手段の情報に基づいて伝送遅延を測定し、伝送遅延が所定値以下の場合に隣接セルをCoMP Cooperation Setに追加するようにしたので、CoMP Cooperation Setを自動的に構成しつつ、基地局間インタフェースにおいてＣｏＭＰを行うのに十分な伝送特性を有している隣接セル（ＣｏＭＰで必要な情報を低遅延で交換可能な隣接基地局のセル）のみとＣｏＭＰを実施することが可能となる。   As described above, in the automatic configuration procedure of the CoMP Cooperation Set in the radio communication system of the present embodiment, control information and data are exchanged at the time of CoMP implementation to the base station forming the neighboring cell detected and reported by the UE 3 by the ANR function. Requesting the information of the line used for transmission and the information of the means for measuring the delay of the line, measuring the transmission delay based on the line information and the information of the line delay measuring means notified as the response, and transmitting Adjacent cells are added to the CoMP Cooperation Set when the delay is less than or equal to the predetermined value, so that it has sufficient transmission characteristics to perform CoMP at the inter-base station interface while automatically configuring the CoMP Cooperation Set. CoMP can be performed only with neighboring cells (cells of neighboring base stations that can exchange information necessary for CoMP with low delay).

なお、本実施の形態では、ＡＮＲ機能により隣接セルを新たに検出したときにＣｏＭＰ実施時に使用する装置間インタフェース１０４の伝送遅延の測定および確立を行うようにしているが、装置間インタフェース１０４を確立した後、定期的に伝送遅延の測定を行い、測定結果に基づきＣｏＭＰの実施・非実施を切り替えるようにしても良い。例えば、上記のステップＳ２１において測定した伝送遅延が所定値以下で、ＣｏＭＰ時の制御情報・データ交換回線を確立してＣｏＭＰを開始した後、定期的にインタフェース１０４の伝送遅延を測定し、伝送遅延が所定値より大きくなった場合にはＣｏＭＰを停止するようにする。逆にＣｏＭＰ非実施時にも定期的にインタフェース１０４の伝送遅延を測定し、伝送遅延が所定値より小さくなった場合にはＣｏＭＰを開始するようにする。これにより、回線（ＣｏＭＰ時の制御情報・データ交換回線）の状態（伝送遅延）が変動する環境においても、ＣｏＭＰを実施する無線基地局を回線状態に応じて適切に選択できる。   In this embodiment, when a neighboring cell is newly detected by the ANR function, the transmission delay of the inter-device interface 104 used at the time of CoMP is measured and established, but the inter-device interface 104 is established. After that, the transmission delay may be measured periodically, and CoMP execution / non-execution may be switched based on the measurement result. For example, after the transmission delay measured in step S21 is equal to or less than a predetermined value and the control information / data exchange line at the time of CoMP is established and CoMP is started, the transmission delay of the interface 104 is periodically measured to determine the transmission delay. When is larger than a predetermined value, CoMP is stopped. Conversely, even when CoMP is not implemented, the transmission delay of the interface 104 is periodically measured, and when the transmission delay becomes smaller than a predetermined value, CoMP is started. As a result, even in an environment where the state (transmission delay) of the line (control information / data exchange line during CoMP) fluctuates, a radio base station that implements CoMP can be appropriately selected according to the line state.

また、本実施の形態では、ｅＮＢ２１とｅＮＢ２２の間の回線（装置間インタフェース１０４）は有線回線を想定して説明を行ったが、ｅＮＢ２１とｅＮＢ２２間に無線伝送区間を含んでいても良い。例えばｅＮＢ２２がＬＴＥ−Ａｄｖａｎｃｅｄシステムで採用されるリレー基地局の場合には、ｅＮＢ２２とｅＮＢ２１の間にＤｅＮＢ（Donor eNB）が存在（ｅＮＢ２１がｅＮＢ２２のＤｅＮＢであっても良い）し、ｅＮＢ２２とＤｅＮＢ間は無線伝送，ＤｅＮＢとｅＮＢ２１間は有線伝送の組み合わせとなる（ｅＮＢ２１もリレー基地局の場合も同様である）が、ｅＮＢ２１とｅＮＢ２２の間の伝送遅延の測定結果によりＣｏＭＰ実施を決定することに変わりはない。   In the present embodiment, the line between the eNB 21 and the eNB 22 (the inter-device interface 104) has been described assuming a wired line. However, a radio transmission section may be included between the eNB 21 and the eNB 22. For example, when the eNB 22 is a relay base station employed in the LTE-Advanced system, there is a DeNB (Donor eNB) between the eNB 22 and the eNB 21 (the eNB 21 may be a DeNB of the eNB 22), and the eNB 22 is between the DeNB Is a combination of wireless transmission and wired transmission between the DeNB and the eNB 21 (the same applies to the case of the eNB 21 and the relay base station), but instead of determining the CoMP implementation based on the measurement result of the transmission delay between the eNB 21 and the eNB 22 There is no.

以上のように、本発明にかかる無線基地局は、隣接している複数のセル間で協調して無線通信を行う無線通信システムを実現する場合に適している。   As described above, the radio base station according to the present invention is suitable for realizing a radio communication system that performs radio communication in cooperation between a plurality of adjacent cells.

３ 移動端末（ＵＥ）
１１，１２ コアネットワーク装置（ＭＭＥ）
２１，２２ 無線基地局（ｅＮＢ）
４１，４２ セル（Ｃｅｌｌ）
１０１，１０２，１０３，１０４ 装置間インタフェース 3 Mobile terminal (UE)
11, 12 Core network equipment (MME)
21, 22 Radio base station (eNB)
41, 42 cell
101, 102, 103, 104 Interface between devices

Claims (10)

隣接している無線基地局である隣接基地局が配下の移動端末により検出された場合に当該移動端末のハンドオーバ制御で必要な情報を送受信するための回線を当該隣接基地局との間で設定する機能、および他の無線基地局と協調して無線送受信を行う協調機能を有する無線基地局であって、
前記ハンドオーバ制御で必要な情報を送受信するための回線を隣接基地局との間で設定する動作において、当該回線設定のための情報を交換する際に、当該隣接基地局と協調して無線送受信を行う場合の制御情報やデータを交換するための協調動作用回線の情報および当該協調動作用回線における伝送遅延測定のための情報も併せて交換し、さらに、当該協調動作用回線における伝送遅延を測定し、当該測定結果に基づいて、前記隣接基地局と協調して無線送受信を行うか否かを判定する
ことを特徴とする無線基地局。 When an adjacent base station that is an adjacent radio base station is detected by a subordinate mobile terminal, a line for transmitting and receiving information necessary for handover control of the mobile terminal is set up with the adjacent base station A wireless base station having a function and a cooperative function of performing wireless transmission and reception in cooperation with another wireless base station,
In the operation of setting a line for transmitting / receiving information necessary for the handover control with an adjacent base station, when exchanging information for the line setting, wireless transmission / reception is performed in cooperation with the adjacent base station. Control information and data for cooperative operation for exchanging data and information for transmission delay measurement in the cooperative operation line are also exchanged, and the transmission delay in the cooperative operation line is measured. Then, based on the measurement result, it is determined whether to perform radio transmission / reception in cooperation with the adjacent base station. 前記ハンドオーバ制御で必要な情報を送受信するための回線を前記協調動作用回線として使用する
ことを特徴とする請求項１に記載の無線基地局。 The radio base station according to claim 1, wherein a line for transmitting and receiving information necessary for the handover control is used as the cooperative operation line. 前記協調動作用回線における伝送遅延測定のための情報は、使用可能な伝送遅延測定方法のリストを含む
ことを特徴とする請求項１または２に記載の無線基地局。 The radio base station according to claim 1 or 2, wherein the information for transmission delay measurement in the cooperative operation line includes a list of usable transmission delay measurement methods. すべての隣接基地局との間で協調動作用回線を設定するとともに、各協調動作用回線における伝送遅延を定期的に測定し、測定結果を取得するごとに、当該測定結果に基づいて隣接基地局と協調して無線送受信を行うかどうかを再判定し、協調して無線送受信を行う隣接基地局を適応的に変更する
ことを特徴とする請求項１、２または３に記載の無線基地局。 While setting up a cooperative operation line with all adjacent base stations, periodically measuring the transmission delay in each cooperative operation line and obtaining the measurement result, the adjacent base station is based on the measurement result. The radio base station according to claim 1, 2 or 3, wherein it is re-determined whether or not to perform radio transmission / reception in cooperation with each other, and an adjacent base station that performs radio transmission / reception in cooperation is adaptively changed. 前記協調機能を、３ＧＰＰ（3rd Generation Partnership Project）のＬＴＥ−Ａｄｖａｎｃｅｄ（Long Term Evolution-Advanced）システムにおけるＣｏＭＰ（Coordinated MultiPoint transmission/reception）とすることを特徴とする請求項１〜４のいずれか一つに記載の無線基地局。   The cooperation function is CoMP (Coordinated MultiPoint transmission / reception) in LTE-Advanced (Long Term Evolution-Advanced) system of 3GPP (3rd Generation Partnership Project). The radio base station described in 1. 隣接している無線基地局である隣接基地局が配下の移動端末により検出された場合に当該移動端末のハンドオーバ制御で必要な情報を送受信するための回線を当該隣接基地局との間で設定する無線基地局と、無線基地局を収容するコアネットワーク装置と、を備えた無線通信システムにおいて、無線基地局が隣接基地局と協調して無線送受信を行う場合の通信方法であって、
各無線基地局が、配下の移動端末により検出された隣接基地局と協調して無線送受信を行うか否かを判定するための処理として、
前記ハンドオーバ制御で必要な情報を送受信するための回線を隣接基地局との間で設定する際に、当該回線設定のための情報とともに、当該隣接基地局と協調して無線送受信を行う場合の制御情報やデータを交換するための協調動作用回線の情報および当該協調動作用回線における伝送遅延測定のための情報を前記コアネットワーク装置経由で交換する情報交換ステップと、
前記情報交換ステップにおいて交換した情報を用いて前記協調動作用回線における伝送遅延を測定する遅延測定ステップと、
前記伝送遅延の測定結果に基づいて、前記隣接基地局と協調して無線送受信を行うか否かを判定する判定ステップと、
を含むことを特徴とする通信方法。 When an adjacent base station that is an adjacent radio base station is detected by a subordinate mobile terminal, a line for transmitting and receiving information necessary for handover control of the mobile terminal is set up with the adjacent base station In a radio communication system comprising a radio base station and a core network device that accommodates the radio base station, a communication method when the radio base station performs radio transmission / reception in cooperation with an adjacent base station,
As a process for determining whether each radio base station performs radio transmission / reception in cooperation with an adjacent base station detected by a subordinate mobile terminal,
Control when performing transmission / reception in cooperation with the adjacent base station together with information for setting the line when setting a line for transmitting / receiving information necessary for the handover control with the adjacent base station An information exchanging step of exchanging information of a cooperative operation line for exchanging information and data and information for transmission delay measurement in the cooperative operation line via the core network device;
A delay measurement step of measuring a transmission delay in the cooperative operation line using the information exchanged in the information exchange step;
A determination step of determining whether to perform radio transmission / reception in cooperation with the adjacent base station based on the measurement result of the transmission delay;
A communication method comprising: 前記ハンドオーバ制御で必要な情報を送受信するための回線を前記協調動作用回線として使用する
ことを特徴とする請求項６に記載の通信方法。 The communication method according to claim 6, wherein a line for transmitting and receiving information necessary for the handover control is used as the cooperative operation line. 前記協調動作用回線における伝送遅延測定のための情報は、隣接基地局を検出した移動端末を収容している無線基地局が使用可能な伝送遅延測定方法のリストを含む
ことを特徴とする請求項６または７に記載の通信方法。 The information for transmission delay measurement in the cooperative operation line includes a list of transmission delay measurement methods that can be used by a radio base station that accommodates a mobile terminal that has detected an adjacent base station. The communication method according to 6 or 7. 各無線基地局は、すべての隣接基地局との間で協調動作用回線を設定するとともに、各協調動作用回線における伝送遅延を定期的に測定し、測定結果を取得するごとに、当該測定結果に基づいて隣接基地局と協調して無線送受信を行うかどうかを再判定し、協調して無線送受信を行う隣接基地局を適応的に変更する
ことを特徴とする請求項６、７または８に記載の通信方法。 Each radio base station sets up a line for cooperative operation with all adjacent base stations, periodically measures the transmission delay in each line for cooperative operation, and acquires the measurement result every time it obtains the measurement result. 9. The wireless communication apparatus according to claim 6, wherein the wireless base station re-determines whether to perform wireless transmission / reception in cooperation with an adjacent base station, and adaptively changes the adjacent base station to perform wireless transmission / reception in cooperation. The communication method described. 隣接基地局と協調して無線送受信を行う機能を、３ＧＰＰ（3rd Generation Partnership Project）のＬＴＥ−Ａｄｖａｎｃｅｄ（Long Term Evolution-Advanced）システムにおけるＣｏＭＰ（Coordinated MultiPoint transmission/reception）とすることを特徴とする請求項６〜９のいずれか一つに記載の通信方法。   The function of performing wireless transmission / reception in cooperation with an adjacent base station is CoMP (Coordinated MultiPoint transmission / reception) in LTE-Advanced (Long Term Evolution-Advanced) system of 3GPP (3rd Generation Partnership Project) Item 10. The communication method according to any one of Items 6 to 9.
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