WO2013069625A1 - Mobile communication method and wireless base station - Google Patents

Mobile communication method and wireless base station Download PDF

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Publication number
WO2013069625A1
WO2013069625A1 PCT/JP2012/078700 JP2012078700W WO2013069625A1 WO 2013069625 A1 WO2013069625 A1 WO 2013069625A1 JP 2012078700 W JP2012078700 W JP 2012078700W WO 2013069625 A1 WO2013069625 A1 WO 2013069625A1
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base station
transmission point
mobile station
signal
transmission
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PCT/JP2012/078700
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French (fr)
Japanese (ja)
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高橋　秀明
聡 永田
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株式会社エヌ・ティ・ティ・ドコモ
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/022—Site diversity; Macro-diversity
    • H04B7/024—Co-operative use of antennas of several sites, e.g. in co-ordinated multipoint or co-operative multiple-input multiple-output [MIMO] systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
    • H04B7/0615—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal
    • H04B7/0619—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal using feedback from receiving side
    • H04B7/0621—Feedback content
    • H04B7/0632—Channel quality parameters, e.g. channel quality indicator [CQI]

Definitions

  • the present invention relates to a mobile communication method and a radio base station.
  • the radio base station eNB sets a plurality of transmission points for the mobile station UE connected to the subordinate cell, and receives signals from the set one or more transmission points. Configured to send.
  • the mobile station UE is configured to feed back a CQI (Channel Quality Indicator) at a set transmission point to the radio base station eNB.
  • CQI Channel Quality Indicator
  • the mobile station UE has to feed back CQI even at a transmission point that is used less frequently, so that the load on uplink radio resources becomes large. There was a point.
  • the present invention has been made in view of the above-described problems, and provides a mobile communication method and a radio base station that can avoid unnecessary CQI feedback when CoMP transmission / reception processing is performed. Objective.
  • a first feature of the present invention is a mobile communication method, in which a radio base station sets a transmission point for multipoint coordinated transmission / reception processing by a RRC signal for a mobile station connected to a subordinate cell. Step A, Step B in which the wireless base station activates and deactivates the set transmission point with respect to the mobile station by a MAC-CE signal, and the mobile station And a step C of transmitting quality information at the transmission point being activated to the station and not transmitting quality information at the transmission point being deactivated.
  • a second feature of the present invention is a radio base station, which sets a transmission point for multipoint coordinated transmission / reception processing by an RRC signal for a mobile station connected to a cell under the radio base station, A transmission unit configured to activate and deactivate the transmission point set by the MAC-CE signal to the mobile station, and the transmission activated from the mobile station And a receiving unit configured to receive the quality information at the point and not receive the quality information at the deactivated transmission point.
  • 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 according to the first embodiment of the present invention.
  • FIG. 3 is a diagram illustrating an example of “MAC Control Element” used in the mobile communication system according to the first embodiment of the present invention.
  • FIG. 4 is a diagram illustrating an example of “MAC Control Element” used in the mobile communication system according to the first modification of the present invention.
  • Mobile communication system Mobile communication system according to the first embodiment of the present invention
  • or FIG. 3 the mobile communication system which concerns on the 1st Embodiment of this invention is demonstrated.
  • an LTE mobile communication system will be described as an example of the mobile communication system according to the present embodiment, but the present invention is also applicable to mobile communication systems other than the LTE system.
  • the mobile communication system according to the present embodiment is configured to be able to perform CoMP transmission / reception processing.
  • CoMP transmission / reception processing includes “JT (Joint Transmission)”, “DCS (Dynamic Cell Selection)”, “CS / CB (Coordinated Scheduling / Beamforming)”, and the like.
  • JT is a process of transmitting the shared data channel signal to the mobile station UE from a plurality of cells, that is, from cells other than the serving cell.
  • DCS is a process of selecting one cell at high speed based on channel quality information (CQI) and transmitting a shared data channel signal from the selected cell to the mobile station UE.
  • CQI channel quality information
  • CS / CB is a process for coordinating scheduling and beamforming between the serving cell and the neighboring cells.
  • the mobile communication system is configured to be able to provide CoMP transmission / reception processing in cells (CoMP transmission points) # 1 to # 5. Assume that # 1 to # 5 are configured to be CoMP support areas.
  • the cells # 1 to # 5 may be managed by the same radio base station eNB, or may be managed by different radio base stations eNB. Further, cells # 1 to # 5 are assumed to have different coverage areas.
  • Each cell # 1 to # 5 is configured to be able to transmit CSI-RS (Channel State Reference Signal) in addition to CRS (Cell Specific Reference Signal).
  • CSI-RS Channel State Reference Signal
  • CRS Cell Specific Reference Signal
  • the CRS is a reference signal defined by the LTE Rel-8 / 9 scheme, and is a reference signal set in common for all mobile stations UE in each cell.
  • the CSI-RS is a reference signal defined by the LTE Rel-10 method, and is a reference signal that is individually set for each mobile station UE using an RRC (Radio Resource Control) signal.
  • RRC Radio Resource Control
  • the CSI-RS may be used for quality measurement processing such as a CoMP transmission point (CoMP transmission / reception processing target candidate), a serving cell, a neighboring cell (handover destination candidate), and the CoMP transmission / reception processing is performed. It may be used to measure CQI at a CoMP transmission point or a serving cell.
  • the CSI-RS used for the quality measurement process described above and the CSI-RS used for measuring the CQI described above may be the same or different.
  • the CSI-RS used for the quality measurement process and the CSI- used for measuring the CQI are measured based on the measurement accuracy in the quality measurement process and the requirements for the measurement accuracy of the CQI. A decision can be made as to whether the RSs are the same or different.
  • the CSI-RS arrangement density is configured to be lower than the CRS arrangement density.
  • the radio base station eNB includes a control unit 11, a transmission unit 12, and a reception unit 13.
  • the control unit 11 is configured to cooperate with the transmission unit 12 and the reception unit 13 to perform various types of control related to CoMP transmission / reception processing and carrier aggregation (CA) processing.
  • CA carrier aggregation
  • the transmission unit 12 is configured to transmit various signals to the mobile station UE
  • the reception unit 13 is configured to receive various signals from the mobile station UE.
  • the transmission unit 12 is configured to set a CoMP transmission point by transmitting an RRC signal, for example, “RRC Connection Reconfiguration”, to the mobile station UE connected to a subordinate cell. Yes.
  • the transmitting unit 12 transmits a MAC-CE (Media Access Control Element) signal to the mobile station UE, thereby activating the CoMP transmission point set for the mobile station UE (Activation). ) And Deactivation.
  • MAC-CE Media Access Control Control Element
  • the transmission unit 12 uses a reserve bit R (see TS36.321 of 3GPP) in the MAC-CE signal C used for Scell activation and deactivation in carrier aggregation.
  • the set CoMP transmission point may be activated and deactivated.
  • the mobile station UE is instructed to activate and deactivate the CoMP transmission point set for the mobile station UE. judge.
  • the mobile station UE sets such bits C 1 to When it is determined that the activation of the Scell corresponding to C 7 is instructed and the bits C 1 to C 7 are set to “0”, the deactivation of the Scell corresponding to the bits C 1 to C 7 Is determined to be instructed.
  • the transmission unit 12 uses the bits C 1 to C 7 in the newly defined dedicated MAC-CE signal D to activate and deactivate the set CoMP transmission point. It may be configured to perform activation.
  • the mobile station UE sets the transmission point for CoMP corresponding to the bits C 1 to C 7 .
  • the bits C 1 to C 7 are set to “1”
  • deactivation of the CoMP transmission point corresponding to the bits C 1 to C 7 is instructed. It is determined that
  • the mobile station UE is configured to transmit the CQI at the activated CoMP transmission point to the radio base station eNB and not to transmit the CQI at the deactivated CoMP transmission point. Yes.
  • the mobile station UE is configured to measure the CQI at the CoMP transmission point using the activated CSI-RS at the CoMP transmission point.
  • the CoMP transmission point set for the mobile station UE may be activated in the default state or may not be activated in the default state.
  • the transmission unit 12 is configured to instruct whether to be activated or not activated as a default state of the CoMP transmission point by an RRC signal. Also good.
  • the mobile station UE needs to transmit only the CQI at the CoMP transmission point that is activated, and therefore feeds back the CQI at the transmission point that is used less frequently. This is unnecessary, and the load on the uplink radio resource can be reduced.
  • the radio base station eNB sets a plurality of CoMP transmission points with different coverage areas for the mobile station UE using the RRC signal, and transmits the MAC-CE signal. And each of the plurality of CoMP transmission points can be activated and deactivated.
  • activation and deactivation of each CoMP transmission point can be performed at high speed by using a MAC-CE signal.
  • the setting of a plurality of CoMP transmission points with different coverage areas and the activation and deactivation of each of the plurality of CoMP transmission points are performed independently. be able to.
  • a first feature of the present embodiment is a mobile communication method, in which a radio base station eNB sends a CoMP transmission point (multipoint coordination) to a mobile station UE connected to a subordinate cell using an RRC signal.
  • Step A for setting a transmission point for transmission / reception processing, and Step B for the radio base station eNB to activate and deactivate the set transmission point by a MAC-CE signal for the mobile station UE The mobile station UE includes a step C of transmitting a CQI (quality information) at an activated transmission point to the radio base station eNB and not transmitting a CQI at a deactivated transmission point.
  • the gist The gist.
  • step B activation and deactivation of transmission points are performed using reserve bits in the MAC-CE signal used for Scell activation and deactivation in carrier aggregation. You may go.
  • a second feature of the present embodiment is a radio base station eNB, which sets a CoMP transmission point for a mobile station UE connected to a cell under the radio base station eNB by using an RRC signal, and moves
  • the station 12 is configured to activate and deactivate the set transmission point by the MAC-CE signal, and from the mobile station UE to the activated transmission point.
  • the gist of the invention is to include a receiving unit 13 configured to receive CQI and not to receive CQI at a deactivated transmission point.
  • the transmitter 12 uses the reserved bits in the MAC-CE signal used for Scell activation and deactivation in carrier aggregation, It may be configured to perform deactivation.
  • radio base station eNB and the mobile station UE 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. .
  • Software modules include RAM (Random Access Memory), flash memory, ROM (Read Only Memory), EPROM (Erasable Programmable ROM), EEPROM (Electronically Erasable and Programmable, Removable ROM, and Hard Disk). Alternatively, it may be provided in an arbitrary format storage medium 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. 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 radio base station eNB or the mobile station UE. Further, the storage medium and the processor may be provided as a discrete component in the radio base station eNB or the mobile station UE.
  • UE ... mobile station eNB ... radio base station 11 ... control unit 12 ... transmitting unit 13 ... receiving unit

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

Abstract

The objective of the present invention is to avoid feedback of unnecessary CQI when a CoMP transmission/reception process is performed. A mobile communication method according to the present invention comprises: a step (A) in which a wireless base station (eNB) uses RRC signals to set CoMP transmission points for a mobile station (UE) connected to a cell controlled by the mobile base station (eNB); a step (B) in which the wireless base station (eNB) uses MAC-CE signals to activate/deactivate the set transmission points for the mobile station (UE); and a step (C) in which the mobile station (UE) transmits CQI at the activated transmission points to the wireless base station (eNB), and does not transmit CQI at the deactivated transmission points.

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、セル端に位置する移動局ＵＥにおけるスループットの改善等を図ることを目的として、ＣｏＭＰ（Ｃｏｏｒｄｉｎａｔｅｄ　Ｍｕｌｔｉ-Ｐｏｉｎｔ、マルチポイント協調）送受信処理を適用することについて検討されている。 In the LTE (Long Term Evolution) system, the application of CoMP (Coordinated Multi-Point, multipoint coordination) transmission / reception processing has been studied for the purpose of improving the throughput of the mobile station UE located at the cell edge. Yes.
　かかるＣｏＭＰ送受信処理が行われる場合、無線基地局ｅＮＢが、配下のセルに接続している移動局ＵＥに対して、複数の送信ポイントを設定し、設定した１つ又は複数の送信ポイントから信号を送信するように構成されている。 When such CoMP transmission / reception processing is performed, the radio base station eNB sets a plurality of transmission points for the mobile station UE connected to the subordinate cell, and receives signals from the set one or more transmission points. Configured to send.
　かかるＣｏＭＰ送受信処理が行われる場合、移動局ＵＥは、無線基地局ｅＮＢに対して、設定されている送信ポイントにおけるＣＱＩ（Ｃｈａｎｎｅｌ　Ｑｕａｌｉｔｙ　Ｉｎｄｉｃａｔｏｒ）をフィードバックするように構成されている。 When such CoMP transmission / reception processing is performed, the mobile station UE is configured to feed back a CQI (Channel Quality Indicator) at a set transmission point to the radio base station eNB.
　しかしながら、上述のＣｏＭＰ送受信処理の仕様では、移動局ＵＥは、使用される頻度の低い送信ポイントであっても、ＣＱＩをフィードバックしなければならないため、上り無線リソースにおける負荷が大きくなってしまうという問題点があった。 However, in the above-described CoMP transmission / reception processing specifications, the mobile station UE has to feed back CQI even at a transmission point that is used less frequently, so that the load on uplink radio resources becomes large. There was a point.
　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、ＣｏＭＰ送受信処理が行われる場合に、不要なＣＱＩのフィードバックを回避す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 problems, and provides a mobile communication method and a radio base station that can avoid unnecessary CQI feedback when CoMP transmission / reception processing is performed. Objective.
　本発明の第１の特徴は、移動通信方法であって、無線基地局が、配下のセルに接続している移動局に対して、ＲＲＣ信号によって、マルチポイント協調送受信処理の送信ポイントを設定する工程Ａと、前記無線基地局が、前記移動局に対して、ＭＡＣ-ＣＥ信号によって、設定された前記送信ポイントのアクティブ化及びディアクティブ化を行う工程Ｂと、前記移動局が、前記無線基地局に対して、アクティブ化されている前記送信ポイントにおける品質情報を送信し、ディアクティブ化されている前記送信ポイントにおける品質情報を送信しない工程Ｃ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, in which a radio base station sets a transmission point for multipoint coordinated transmission / reception processing by a RRC signal for a mobile station connected to a subordinate cell. Step A, Step B in which the wireless base station activates and deactivates the set transmission point with respect to the mobile station by a MAC-CE signal, and the mobile station And a step C of transmitting quality information at the transmission point being activated to the station and not transmitting quality information at the transmission point being deactivated.
　本発明の第２の特徴は、無線基地局であって、前記無線基地局配下のセルに接続している移動局に対して、ＲＲＣ信号によって、マルチポイント協調送受信処理の送信ポイントを設定し、該移動局に対して、ＭＡＣ-ＣＥ信号によって、設定された該送信ポイントのアクティブ化及びディアクティブ化を行うように構成されている送信部と、前記移動局から、アクティブ化されている前記送信ポイントにおける品質情報を受信し、ディアクティブ化されている前記送信ポイントにおける品質情報を受信しないように構成されている受信部とを具備することを要旨とする。 A second feature of the present invention is a radio base station, which sets a transmission point for multipoint coordinated transmission / reception processing by an RRC signal for a mobile station connected to a cell under the radio base station, A transmission unit configured to activate and deactivate the transmission point set by the MAC-CE signal to the mobile station, and the transmission activated from the mobile station And a receiving unit configured to receive the quality information at the point and not receive the quality information at the deactivated transmission point.
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の機能ブロック図である。FIG. 2 is a functional block diagram of the radio base station according to the first embodiment of the present invention. 図３は、本発明の第１の実施形態に係る移動通信システムで用いられる「ＭＡＣ　Ｃｏｎｔｒｏｌ　Ｅｌｅｍｅｎｔ」の一例を示す図である。FIG. 3 is a diagram illustrating an example of “MAC Control Element” used in the mobile communication system according to the first embodiment of the present invention. 図４は、本発明の変更例１に係る移動通信システムで用いられる「ＭＡＣ　Ｃｏｎｔｒｏｌ　Ｅｌｅｍｅｎｔ」の一例を示す図である。FIG. 4 is a diagram illustrating an example of “MAC Control Element” used in the mobile communication system according to the first modification 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乃至図３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。本実施形態では、本実施形態に係る移動通信システムとして、ＬＴＥ方式の移動通信システムを例示して説明するが、本発明は、ＬＴＥ方式以外の移動通信システムにも適用可能である。 (Mobile communication system according to the first embodiment of the present invention)
With reference to FIG. 1 thru | or FIG. 3, the mobile communication system which concerns on the 1st Embodiment of this invention is demonstrated. In the present embodiment, an LTE mobile communication system will be described as an example of the mobile communication system according to the present embodiment, but the present invention is also applicable to mobile communication systems other than the LTE system.
　本実施形態に係る移動通信システムは、ＣｏＭＰ送受信処理を行うことができるように構成されている。 The mobile communication system according to the present embodiment is configured to be able to perform CoMP transmission / reception processing.
　例えば、かかるＣｏＭＰ送受信処理には、「ＪＴ（Ｊｏｉｎｔ　Ｔｒａｎｓｍｉｓｓｉｏｎ）」や「ＤＣＳ（Ｄｙｎａｍｉｃ　Ｃｅｌｌ　Ｓｅｌｅｃｔｉｏｎ）」や「ＣＳ/ＣＢ（Ｃｏｏｒｄｉｎａｔｅｄ　Ｓｃｈｅｄｕｌｉｎｇ/Ｂｅａｍｆｏｒｍｉｎｇ）」等が含まれている。 For example, such CoMP transmission / reception processing includes “JT (Joint Transmission)”, “DCS (Dynamic Cell Selection)”, “CS / CB (Coordinated Scheduling / Beamforming)”, and the like.
　ここで、「ＪＴ」は、複数のセルから、すなわち、サービングセル以外のセルからも、移動局ＵＥに対して、共有データチャネル信号を送信する処理である。 Here, “JT” is a process of transmitting the shared data channel signal to the mobile station UE from a plurality of cells, that is, from cells other than the serving cell.
　また、「ＤＣＳ」は、チャネル品質情報（ＣＱＩ）に基づいて、高速に、1つのセルを選択し、選択したセルから、移動局ＵＥに対して、共有データチャネル信号を送信する処理である。 Also, “DCS” is a process of selecting one cell at high speed based on channel quality information (CQI) and transmitting a shared data channel signal from the selected cell to the mobile station UE.
　さらに、「ＣＳ/ＣＢ」は、サービングセルと周辺セルとの間で、スケジューリングやビームフォーミングを協調する処理である。 Furthermore, “CS / CB” is a process for coordinating scheduling and beamforming between the serving cell and the neighboring cells.
　図１に示すように、本実施形態に係る移動通信システムでは、セル（ＣｏＭＰ用送信ポイント）＃１～＃５において、ＣｏＭＰ送受信処理を提供することができるように構成されている、すなわち、セル＃１～＃５が、ＣｏＭＰサポートエリアとなるように構成されているものとする。 As shown in FIG. 1, the mobile communication system according to the present embodiment is configured to be able to provide CoMP transmission / reception processing in cells (CoMP transmission points) # 1 to # 5. Assume that # 1 to # 5 are configured to be CoMP support areas.
　なお、セル＃１～＃５は、同一の無線基地局ｅＮＢによって管理されていてもよいし、異なる無線基地局ｅＮＢによって管理されていてもよい。また、セル＃１～＃５は、異なるカバレッジエリアを有しているものとする。 Note that the cells # 1 to # 5 may be managed by the same radio base station eNB, or may be managed by different radio base stations eNB. Further, cells # 1 to # 5 are assumed to have different coverage areas.
　また、各セル＃１～＃５では、ＣＲＳ（Ｃｅｌｌ　ｓｐｅｃｉｆｉｃ　Ｒｅｆｅｒｅｎｃｅ　Ｓｉｇｎａｌ）に加えて、ＣＳＩ-ＲＳ（Ｃｈａｎｎｅｌ　Ｓｔａｔｅ　Ｉｎｆｏｒｍａｔｉｏｎ　Ｒｅｆｅｒｅｎｃｅ　Ｓｉｇｎａｌ）を送信することができるように構成されている。 Each cell # 1 to # 5 is configured to be able to transmit CSI-RS (Channel State Reference Signal) in addition to CRS (Cell Specific Reference Signal).
　ここで、ＣＲＳは、ＬＴＥのＲｅｌ-８/９方式で規定されている参照信号であって、各セル内の全ての移動局ＵＥに対して共通に設定される参照信号である。 Here, the CRS is a reference signal defined by the LTE Rel-8 / 9 scheme, and is a reference signal set in common for all mobile stations UE in each cell.
　一方、ＣＳＩ-ＲＳは、ＬＴＥのＲｅｌ-１０方式で規定されている参照信号であって、ＲＲＣ（Ｒａｄｉｏ　Ｒｅｓｏｕｒｃｅ　Ｃｏｎｔｒｏｌ）信号を用いて移動局ＵＥごとに個別に設定される参照信号である。 On the other hand, the CSI-RS is a reference signal defined by the LTE Rel-10 method, and is a reference signal that is individually set for each mobile station UE using an RRC (Radio Resource Control) signal.
　ＣＳＩ-ＲＳは、ＣｏＭＰ用送信ポイント（ＣｏＭＰ送受信処理の対象候補）やサービングセルや周辺セル（ハンドオーバ先候補）等の品質測定処理のために用いられてもよいし、ＣｏＭＰ送受信処理が行われているＣｏＭＰ用送信ポイントやサービングセルにおけるＣＱＩを測定するために用いられてもよい。 The CSI-RS may be used for quality measurement processing such as a CoMP transmission point (CoMP transmission / reception processing target candidate), a serving cell, a neighboring cell (handover destination candidate), and the CoMP transmission / reception processing is performed. It may be used to measure CQI at a CoMP transmission point or a serving cell.
　なお、上述の品質測定処理のために用いられるＣＳＩ-ＲＳ及び上述のＣＱＩを測定するために用いられるＣＳＩ-ＲＳは、同じものであってもよいし、異なるものであってもよい。 Note that the CSI-RS used for the quality measurement process described above and the CSI-RS used for measuring the CQI described above may be the same or different.
　例えば、上述の品質測定処理における測定精度及び上述のＣＱＩの測定精度に対する要求条件に基づいて、上述の品質測定処理のために用いられるＣＳＩ-ＲＳ及び上述のＣＱＩを測定するために用いられるＣＳＩ-ＲＳを同じものにするか或いは異なるものにするかについて決定することができる。 For example, the CSI-RS used for the quality measurement process and the CSI- used for measuring the CQI are measured based on the measurement accuracy in the quality measurement process and the requirements for the measurement accuracy of the CQI. A decision can be made as to whether the RSs are the same or different.
　また、ＣＳＩ-ＲＳの配置密度は、ＣＲＳの配置密度と比べて低くなるように構成されている。 Also, the CSI-RS arrangement density is configured to be lower than the CRS arrangement density.
　また、セル＃１～＃５においてＣｏＭＰ送受信処理が提供される場合、セル（ＣｏＭＰ用送信ポイント）＃１～＃５において、同一のＰＣＩ（Ｐｈｙｓｉｃａｌ　Ｃｅｌｌ　ＩＤ）が用いられるように構成されていてもよいし、異なるＰＣＩが用いられるように構成されていてもよい。 In addition, when CoMP transmission / reception processing is provided in cells # 1 to # 5, the same PCI (Physical Cell ID) may be used in cells (CoMP transmission points) # 1 to # 5. Alternatively, different PCIs may be used.
　図２に示すように、無線基地局ｅＮＢは、制御部１１と、送信部１２と、受信部１３とを具備している。 As illustrated in FIG. 2, the radio base station eNB includes a control unit 11, a transmission unit 12, and a reception unit 13.
　制御部１１は、送信部１２及び受信部１３と協働して、ＣｏＭＰ送受信処理やキャリアアグリゲーション（ＣＡ：Ｃａｒｒｉｅｒ　Ａｇｇｒｉｇａｔｉｏｎ）処理に関する各種制御を行うように構成されている。 The control unit 11 is configured to cooperate with the transmission unit 12 and the reception unit 13 to perform various types of control related to CoMP transmission / reception processing and carrier aggregation (CA) processing.
　送信部１２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おり、受信部１３は、移動局ＵＥから各種信号を受信するように構成されている。 The transmission unit 12 is configured to transmit various signals to the mobile station UE, and the reception unit 13 is configured to receive various signals from the mobile station UE.
　例えば、送信部１２は、配下のセルに接続している移動局ＵＥに対して、ＲＲＣ信号、例えば、「ＲＲＣ　Ｃｏｎｎｅｃｔｉｏｎ　Ｒｅｃｏｎｆｉｇｕｒａｔｉｏｎ」を送信することによって、ＣｏＭＰ用送信ポイントを設定するように構成されている。 For example, the transmission unit 12 is configured to set a CoMP transmission point by transmitting an RRC signal, for example, “RRC Connection Reconfiguration”, to the mobile station UE connected to a subordinate cell. Yes.
　また、送信部１２は、移動局ＵＥに対して、ＭＡＣ-ＣＥ（Ｍｅｄｉａ　Ａｃｃｅｓｓ　Ｃｏｎｔｒｏｌ　Ｃｏｎｔｒｏｌ　Ｅｌｅｍｅｎｔ）信号を送信することによって、かかる移動局ＵＥに対して設定されたＣｏＭＰ用送信ポイントのアクティブ化（Ａｃｔｉｖａｔｉｏｎ）及びディアクティブ化（Ｄｅａｃｔｉｖａｔｉｏｎ）を行うように構成されている。 Further, the transmitting unit 12 transmits a MAC-CE (Media Access Control Control Element) signal to the mobile station UE, thereby activating the CoMP transmission point set for the mobile station UE (Activation). ) And Deactivation.
　ここで、送信部１２は、図３に示すように、キャリアアグリゲーションにおけるＳｃｅｌｌのアクティブ化及びディアクティブ化に用いられるＭＡＣ-ＣＥ信号Ｃ内のリザーブビットＲ（３ＧＰＰのＴＳ３６.３２１参照）を用いて、設定されたＣｏＭＰ用送信ポイントのアクティブ化及びディアクティブ化を行うように構成されていてもよい。 Here, as illustrated in FIG. 3, the transmission unit 12 uses a reserve bit R (see TS36.321 of 3GPP) in the MAC-CE signal C used for Scell activation and deactivation in carrier aggregation. The set CoMP transmission point may be activated and deactivated.
　ここで、移動局ＵＥは、かかるリザーブビットが「１」に設定されている場合、かかる移動局ＵＥに対して設定されているＣｏＭＰ用送信ポイントのアクティブ化及びディアクティブ化が指示されていると判定する。 Here, when the reserve bit is set to “1”, the mobile station UE is instructed to activate and deactivate the CoMP transmission point set for the mobile station UE. judge.
　なお、移動局ＵＥは、キャリアアグリゲーションにおけるＳｃｅｌｌのアクティブ化及びディアクティブ化に用いられるＭＡＣ-ＣＥ信号Ｃ内のビットＣ１～Ｃ７が「１」に設定されている場合、かかるビットＣ１～Ｃ７に対応するＳｃｅｌｌのアクティブ化が指示されていると判定し、ビットＣ１～Ｃ７が「０」に設定されている場合、かかるビットＣ１～Ｃ７に対応するＳｃｅｌｌのディアクティブ化が指示されていると判定する。 Note that, when the bits C 1 to C 7 in the MAC-CE signal C used for Scell activation and deactivation in the carrier aggregation are set to “1”, the mobile station UE sets such bits C 1 to When it is determined that the activation of the Scell corresponding to C 7 is instructed and the bits C 1 to C 7 are set to “0”, the deactivation of the Scell corresponding to the bits C 1 to C 7 Is determined to be instructed.
　或いは、送信部１２は、図４に示すように、新規に規定された専用のＭＡＣ-ＣＥ信号Ｄ内のビットＣ１～Ｃ７を用いて、設定されたＣｏＭＰ用送信ポイントのアクティブ化及びディアクティブ化を行うように構成されていてもよい。 Alternatively, as shown in FIG. 4, the transmission unit 12 uses the bits C 1 to C 7 in the newly defined dedicated MAC-CE signal D to activate and deactivate the set CoMP transmission point. It may be configured to perform activation.
　ここで、移動局ＵＥは、かかる専用のＭＡＣ-ＣＥ信号Ｃ内のビットＣ１～Ｃ７が「１」に設定されている場合、かかるビットＣ１～Ｃ７に対応するＣｏＭＰ用送信ポイントのアクティブ化が指示されていると判定し、ビットＣ１～Ｃ７が「１」に設定されている場合、かかるビットＣ１～Ｃ７に対応するＣｏＭＰ用送信ポイントのディアクティブ化が指示されていると判定する。 Here, when the bits C 1 to C 7 in the dedicated MAC-CE signal C are set to “1”, the mobile station UE sets the transmission point for CoMP corresponding to the bits C 1 to C 7 . When it is determined that activation is instructed and the bits C 1 to C 7 are set to “1”, deactivation of the CoMP transmission point corresponding to the bits C 1 to C 7 is instructed. It is determined that
　なお、移動局ＵＥは、無線基地局ｅＮＢに対して、アクティブ化されているＣｏＭＰ用送信ポイントにおけるＣＱＩを送信し、ディアクティブ化されているＣｏＭＰ用送信ポイントにおけるＣＱＩを送信しないように構成されている。 The mobile station UE is configured to transmit the CQI at the activated CoMP transmission point to the radio base station eNB and not to transmit the CQI at the deactivated CoMP transmission point. Yes.
　すなわち、移動局ＵＥは、アクティブ化されているＣｏＭＰ用送信ポイントにおけるＣＳＩ-ＲＳを用いて、かかるＣｏＭＰ用送信ポイントにおけるＣＱＩを測定するように構成されている。 That is, the mobile station UE is configured to measure the CQI at the CoMP transmission point using the activated CSI-RS at the CoMP transmission point.
　なお、移動局ＵＥに対して設定されたＣｏＭＰ用送信ポイントは、デフォルト状態で、アクティブ化されていてもよいし、デフォルト状態では、アクティブ化されていなくてもよい。 Note that the CoMP transmission point set for the mobile station UE may be activated in the default state or may not be activated in the default state.
　送信部１２は、ＲＲＣ信号によって、ＣｏＭＰ用送信ポイントのデフォルト状態として、アクティブ化されている状態であるべきか、或いは、アクティブ化されていない状態であるべきかについて指示するように構成されていてもよい。 The transmission unit 12 is configured to instruct whether to be activated or not activated as a default state of the CoMP transmission point by an RRC signal. Also good.
　本実施形態に係る移動通信システムによれば、移動局ＵＥは、アクティブ化されているＣｏＭＰ用送信ポイントにおけるＣＱＩのみを送信すればよいため、使用される頻度の低い送信ポイントにおけるＣＱＩについてはフィードバックしなくてもよくなり、上り無線リソースにおける負荷を低減することができる。 According to the mobile communication system according to the present embodiment, the mobile station UE needs to transmit only the CQI at the CoMP transmission point that is activated, and therefore feeds back the CQI at the transmission point that is used less frequently. This is unnecessary, and the load on the uplink radio resource can be reduced.
　また、本実施形態に係る移動通信システムでは、無線基地局ｅＮＢが、ＲＲＣ信号を用いて、移動局ＵＥに対して、カバレッジエリアの異なる複数のＣｏＭＰ用送信ポイントを設定し、ＭＡＣ-ＣＥ信号を用いて、かかる複数のＣｏＭＰ用送信ポイントの各々のアクティブ化及びディアクティブ化を行うことができるように構成されている。 Moreover, in the mobile communication system according to the present embodiment, the radio base station eNB sets a plurality of CoMP transmission points with different coverage areas for the mobile station UE using the RRC signal, and transmits the MAC-CE signal. And each of the plurality of CoMP transmission points can be activated and deactivated.
　すなわち、本実施形態に係る移動通信システムによれば、ＭＡＣ-ＣＥ信号を用いることで、ＣｏＭＰ用送信ポイントの各々のアクティブ化及びディアクティブ化の切り替えを高速に行うことができる。 That is, according to the mobile communication system according to the present embodiment, activation and deactivation of each CoMP transmission point can be performed at high speed by using a MAC-CE signal.
　さらに、本実施形態に係る移動通信システムによれば、カバレッジエリアの異なる複数のＣｏＭＰ用送信ポイントの設定、及び、かかる複数のＣｏＭＰ用送信ポイントの各々のアクティブ化及びディアクティブ化を独立して行うことができる。 Furthermore, according to the mobile communication system according to the present embodiment, the setting of a plurality of CoMP transmission points with different coverage areas and the activation and deactivation of each of the plurality of CoMP transmission points are performed independently. be able to.
　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、移動通信方法であって、無線基地局ｅＮＢが、配下のセルに接続している移動局ＵＥに対して、ＲＲＣ信号によって、ＣｏＭＰ用送信ポイント（マルチポイント協調送受信処理の送信ポイント）を設定する工程Ａと、無線基地局ｅＮＢが、移動局ＵＥに対して、ＭＡＣ-ＣＥ信号によって、設定された送信ポイントのアクティブ化及びディアクティブ化を行う工程Ｂと、移動局ＵＥが、無線基地局ｅＮＢに対して、アクティブ化されている送信ポイントにおけるＣＱＩ（品質情報）を送信し、ディアクティブ化されている送信ポイントにおけるＣＱＩを送信しない工程Ｃとを有することを要旨とする。 A first feature of the present embodiment is a mobile communication method, in which a radio base station eNB sends a CoMP transmission point (multipoint coordination) to a mobile station UE connected to a subordinate cell using an RRC signal. Step A for setting a transmission point for transmission / reception processing, and Step B for the radio base station eNB to activate and deactivate the set transmission point by a MAC-CE signal for the mobile station UE, The mobile station UE includes a step C of transmitting a CQI (quality information) at an activated transmission point to the radio base station eNB and not transmitting a CQI at a deactivated transmission point. The gist.
　本実施形態の第１の特徴において、工程Ｂにおいて、キャリアアグリゲーションにおけるＳｃｅｌｌのアクティブ化及びディアクティブ化に用いられるＭＡＣ-ＣＥ信号内のリザーブビットを用いて、送信ポイントのアクティブ化及びディアクティブ化を行ってもよい。 In the first feature of the present embodiment, in step B, activation and deactivation of transmission points are performed using reserve bits in the MAC-CE signal used for Scell activation and deactivation in carrier aggregation. You may go.
　本実施形態の第２の特徴は、無線基地局ｅＮＢであって、無線基地局ｅＮＢ配下のセルに接続している移動局ＵＥに対して、ＲＲＣ信号によって、ＣｏＭＰ用送信ポイントを設定し、移動局ＵＥに対して、ＭＡＣ-ＣＥ信号によって、設定された送信ポイントのアクティブ化及びディアクティブ化を行うように構成されている送信部１２と、移動局ＵＥから、アクティブ化されている送信ポイントにおけるＣＱＩを受信し、ディアクティブ化されている送信ポイントにおけるＣＱＩを受信しないように構成されている受信部１３とを具備することを要旨とする。 A second feature of the present embodiment is a radio base station eNB, which sets a CoMP transmission point for a mobile station UE connected to a cell under the radio base station eNB by using an RRC signal, and moves The station 12 is configured to activate and deactivate the set transmission point by the MAC-CE signal, and from the mobile station UE to the activated transmission point. The gist of the invention is to include a receiving unit 13 configured to receive CQI and not to receive CQI at a deactivated transmission point.
　本実施形態の第２の特徴において、送信部１２は、キャリアアグリゲーションにおけるＳｃｅｌｌのアクティブ化及びディアクティブ化に用いられるＭＡＣ-ＣＥ信号内のリザーブビットを用いて、設定された送信ポイントのアクティブ化及びディアクティブ化を行うように構成されていてもよい。 In the second feature of the present embodiment, the transmitter 12 uses the reserved bits in the MAC-CE signal used for Scell activation and deactivation in carrier aggregation, It may be configured to perform deactivation.
　なお、上述の無線基地局ｅＮＢや移動局ＵＥ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 radio base station eNB and the mobile station UE 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. .
　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。 Software modules include RAM (Random Access Memory), flash memory, ROM (Read Only Memory), EPROM (Erasable Programmable ROM), EEPROM (Electronically Erasable and Programmable, Removable ROM, and Hard Disk). Alternatively, it may be provided in an arbitrary format storage medium such as a CD-ROM.
　かかる記憶媒体は、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。また、かかる記憶媒体は、プロセッサに集積されていてもよい。また、かかる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。かかるＡＳＩＣは、無線基地局ｅＮＢや移動局ＵＥ内に設けられていてもよい。また、かかる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無線基地局ｅＮＢや移動局ＵＥ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. 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 radio base station eNB or the mobile station UE. Further, the storage medium and the processor may be provided as a discrete component in the radio base station eNB or the mobile station UE.
　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２０１１－２４３８８５号（２０１１年１１月７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 content of Japanese Patent Application No. 2011-243895 (filed on November 7, 2011) is incorporated herein by reference.
　以上説明したように、本発明によれば、ＣｏＭＰ送受信処理が行われる場合に、不要なＣＱＩのフィードバックを回避す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ができる。 As described above, according to the present invention, it is possible to provide a mobile communication method and a radio base station that can avoid unnecessary CQI feedback when CoMP transmission / reception processing is performed.
ＵＥ…移動局
ｅＮＢ…無線基地局
１１…制御部
１２…送信部
１３…受信部 UE ... mobile station eNB ... radio base station 11 ... control unit 12 ... transmitting unit 13 ... receiving unit

Claims (4)

  1. 　無線基地局が、配下のセルに接続している移動局に対して、ＲＲＣ（Ｒａｄｉｏ　Ｒｅｓｏｕｒｃｅ　Ｃｏｎｔｒｏｌ）信号によって、マルチポイント協調送受信処理の送信ポイントを設定する工程Ａと、
    　前記無線基地局が、前記移動局に対して、ＭＡＣ-ＣＥ（Ｍｅｄｉａ　Ａｃｃｅｓｓ　Ｃｏｎｔｒｏｌ　Ｃｏｎｔｒｏｌ　Ｅｌｅｍｅｎｔ）信号によって、設定された前記送信ポイントのアクティブ化及びディアクティブ化を行う工程Ｂと、
    　前記移動局が、前記無線基地局に対して、アクティブ化されている前記送信ポイントにおける品質情報を送信し、ディアクティブ化されている前記送信ポイントにおける品質情報を送信しない工程Ｃとを有することを特徴とする移動通信方法。     Step A in which a radio base station sets a transmission point for multipoint coordinated transmission / reception processing by an RRC (Radio Resource Control) signal for a mobile station connected to a subordinate cell;
    The wireless base station activates and deactivates the set transmission point by a MAC-CE (Media Access Control Element) signal to the mobile station; and
    The mobile station transmits to the radio base station quality information at the activated transmission point and does not transmit quality information at the deactivated transmission point. A characteristic mobile communication method.
  2. 　前記工程Ｂにおいて、キャリアアグリゲーションにおけるＳｃｅｌｌのアクティブ化及びディアクティブ化に用いられる前記ＭＡＣ-ＣＥ信号内のリザーブビットを用いて、前記送信ポイントのアクティブ化及びディアクティブ化を行うことを特徴とする請求項１に記載の移動通信方法。 In the step B, activation and deactivation of the transmission point is performed using reserve bits in the MAC-CE signal used for Scell activation and deactivation in carrier aggregation. Item 2. The mobile communication method according to Item 1.
  3. 　無線基地局であって、
    　前記無線基地局配下のセルに接続している移動局に対して、ＲＲＣ（Ｒａｄｉｏ　Ｒｅｓｏｕｒｃｅ　Ｃｏｎｔｒｏｌ）信号によって、マルチポイント協調送受信処理の送信ポイントを設定し、該移動局に対して、ＭＡＣ-ＣＥ（Ｍｅｄｉａ　Ａｃｃｅｓｓ　Ｃｏｎｔｒｏｌ　Ｃｏｎｔｒｏｌ　Ｅｌｅｍｅｎｔ）信号によって、設定された該送信ポイントのアクティブ化及びディアクティブ化を行うように構成されている送信部と、
    　前記移動局から、アクティブ化されている前記送信ポイントにおける品質情報を受信し、ディアクティブ化されている前記送信ポイントにおける品質情報を受信しないように構成されている受信部とを具備することを特徴とする無線基地局。     A wireless base station,
    For a mobile station connected to a cell under the radio base station, a transmission point for multipoint coordinated transmission / reception processing is set by an RRC (Radio Resource Control) signal, and the MAC-CE ( A transmitter configured to activate and deactivate the transmission point set by a Media Access Control Element) signal;
    A reception unit configured to receive quality information at the activated transmission point from the mobile station and not to receive quality information at the deactivated transmission point. A wireless base station.
  4. 　前記送信部は、キャリアアグリゲーションにおけるＳｃｅｌｌのアクティブ化及びディアクティブ化に用いられる前記ＭＡＣ-ＣＥ信号内のリザーブビットを用いて、前記送信ポイントのアクティブ化及びディアクティブ化を行うように構成されていることを特徴とする請求項３に記載の無線基地局。 The transmission unit is configured to activate and deactivate the transmission point using a reserve bit in the MAC-CE signal used for Scell activation and deactivation in carrier aggregation. The radio base station according to claim 3.
PCT/JP2012/078700 2011-11-07 2012-11-06 Mobile communication method and wireless base station WO2013069625A1 (en)

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