WO2012081480A1 - Base station and interfering base station information transmission method - Google Patents

Base station and interfering base station information transmission method Download PDF

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Publication number
WO2012081480A1
WO2012081480A1 PCT/JP2011/078355 JP2011078355W WO2012081480A1 WO 2012081480 A1 WO2012081480 A1 WO 2012081480A1 JP 2011078355 W JP2011078355 W JP 2011078355W WO 2012081480 A1 WO2012081480 A1 WO 2012081480A1
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base station
macro
interference
information
measurement result
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PCT/JP2011/078355
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French (fr)
Japanese (ja)
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高橋　秀明
哲士 阿部
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株式会社 エヌ・ティ・ティ・ドコモ
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Publication of WO2012081480A1 publication Critical patent/WO2012081480A1/en

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W28/00—Network traffic management; Network resource management
    • H04W28/02—Traffic management, e.g. flow control or congestion control
    • H04W28/04—Error control
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W24/00—Supervisory, monitoring or testing arrangements
    • H04W24/10—Scheduling measurement reports ; Arrangements for measurement reports
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
    • H04W88/08—Access point devices

Definitions

  • the present invention relates to a mobile communication system, and more particularly, to a technique for setting a common ABS (Almost Blank Subframe) pattern among a plurality of base stations in a heterogeneous network.
  • ABS Almost Blank Subframe
  • LTE Long-Term Evolution
  • 3GPP 3rd Generation Partnership Project
  • various types of cells such as picocells are used to efficiently accommodate locally concentrated high-density traffic.
  • a wireless access network (RAN: “Radio Access Network”) configuration called a heterogeneous network (Heterogeneous Network) is proposed.
  • pico base stations In heterogeneous networks, pico base stations (Pico-eNB) are mixed with macro base stations to provide a small range of pico cells overlaid on a wide range of macro cells provided by macro base stations (Macro eNB). Installed.
  • the user equipment actively sets the parameters so as to hand over to the pico base station, and performs signaling to the user equipment, thereby substantially reducing the cell radius of the pico base station.
  • CRE Cell Range Expansion
  • inter-cell interference control eICIC: enhanced Inter-Cell Interference Coordination
  • inter-cell interference control technology in the frequency domain using carrier aggregation and time domain (subframe unit) Inter-cell interference control technology has been proposed.
  • a subframe group (indicated by the ABS pattern) that does not transmit data called Almost Blank Subframe (ABS) is set in the macro base station, and the ABS pattern is subordinate to the macro base station.
  • ABS Almost Blank Subframe
  • the pico base station performs resource allocation (scheduling) for subordinate user apparatuses in consideration of the ABS pattern.
  • a pico cell (a user apparatus connected to the pico base station) formed by the pico base station may receive strong interference from a plurality of macro base stations as well as one macro base station.
  • FIG. 1 shows a state in which a common ABS pattern is set between the macro base stations A, B, and C in a communication system including the pico base station P, the user equipment U, and the macro base stations A, B, and C. Has been.
  • Non-patent document 2 As an example of a method for setting a common ABS pattern among a plurality of macro base stations, a method has been proposed in which one macro base station notifies its own ABS pattern to an adjacent macro base station ( Non-patent document 2).
  • ABS corresponds to a protected resource in a pico cell
  • ABS is also referred to as a protected subframe.
  • the present invention has been made in view of the above points, and a protection subframe group is set in a first base station such as a macro base station, and pattern information indicating the protection subframe group is stored in a first base station such as a pico base station. Necessary for setting common protection subframe group pattern information among a plurality of first base stations that interfere with user equipment connected to the second base station in the communication system notified to the second base station An object is to provide a technique for determining information and notifying a first apparatus.
  • a first base station and a second base station are provided, and a protection subframe group is set in the first base station, and a protection subframe is provided.
  • a base station used as the second base station is provided.
  • the base station receives, from the user equipment connected to the base station, a measurement result receiving unit that receives a measurement result of a received signal with a plurality of first base stations as measurement targets, and the measurement result receiving unit Based on the measurement result, an interference base station determination unit that determines a plurality of first base stations that interfere with the user apparatus, and an identification that identifies the plurality of first base stations determined by the interference base station determination unit Interfering base station information transmitting means for transmitting information to a predetermined first base station.
  • the identification information transmitted to the predetermined first base station by the interference base station information transmission means is, for example, a plurality of first information determined by the interference base station determination means in the predetermined first base station. Identification information used for setting common protection subframe group pattern information between the base stations.
  • a first base station and a second base station are provided, a protection subframe group is set in the first base station, and pattern information indicating the protection subframe group is provided.
  • an interference base station information transmission method in a base station used as the second base station.
  • the interference base station information transmission method includes a measurement result receiving step of receiving measurement results of received signals with a plurality of first base stations as measurement targets from a user apparatus connected to the base station, and the measurement result reception An interference base station determination step for determining a plurality of first base stations that interfere with the user apparatus based on the measurement results received in the step; and a plurality of first base stations determined by the interference base station determination step Interfering base station information transmitting step for transmitting identification information for identifying to a predetermined first base station.
  • a protection subframe group is set in a first base station such as a macro base station, and pattern information indicating the protection subframe group is notified to a second base station such as a pico base station. Determining information necessary for setting common protection subframe group pattern information among a plurality of first base stations that interfere with a user equipment connected to a second base station, It is possible to provide a technique for notifying one base station.
  • FIG. 2 is a functional configuration diagram of a macro base station 1.
  • FIG. 2 is a functional configuration diagram of a pico base station 10.
  • FIG. It is a sequence diagram for demonstrating operation
  • FIG. 2 shows a configuration of a communication system (mobile communication system) according to the embodiment of the present invention.
  • a plurality of macro base stations (Macro eNB) 1 to 3 each forming one macro cell (Macro-cell) and a macro base station 1 are formed.
  • Each base station is connected to be communicable by wire or wireless.
  • FIG. 2 shows a user apparatus 20 as an example of a user apparatus (UE) belonging to a pico cell.
  • the user equipment 20 is depicted at a position away from the pico cell, but this is for convenience of illustration, and the user equipment 20 is in the pico cell and includes a plurality of macro base stations 1 to 3. It is assumed that the user apparatus is receiving strong interference from the user.
  • Each macro cell may include a plurality of pico base stations, and each pico cell may include a plurality of user apparatuses. However, in FIG. 2, one pico base station 10 and one user apparatus 20 are shown for convenience. Is shown.
  • FIG. 2 also shows PCI (Physical Cell Identifier) that is identification information of each macro cell (each macro base station).
  • PCI Physical Cell Identifier
  • the communication system according to the present embodiment is a communication system based on the LTE / LTE-Advanced scheme.
  • the present invention is not limited to this example, and protected resources (protected resources) such as ABS are set. It may be applied to the communication system.
  • the user apparatus is a mobile phone, an information terminal, a smartphone, a personal digital assistant, a portable personal computer, or the like, but is not limited thereto. Further, as will be described later, the user apparatus according to the present embodiment performs measurement of a received signal from a neighboring macro base station, for example, based on a measurement instruction from the pico base station 10, and the measurement result ( a function of notifying the pico base station 10 of measurement (report).
  • each base station allocates one or more resource blocks (RBs) to a user apparatus (UE), thereby performing downlink and uplink communication. Is called.
  • RBs resource blocks
  • a plurality of resource blocks constituting the system are shared by many user apparatuses.
  • a radio frame including, for example, 10 subframes (for example, 1 subframe is 1 ms) is configured in the time domain.
  • One resource block includes, for example, one slot that is half of one subframe and a predetermined number of subcarriers in the frequency domain.
  • the symbol in the downlink is a symbol generated by the OFDM method.
  • the symbol in the uplink is a symbol generated by the SC-FDMA method (or Spread-DFT) method.
  • the base station determines to which user apparatus among a plurality of user apparatuses a resource is allocated for each sub-frame of 1 ms. The process of determining radio resource allocation is called scheduling.
  • the communication system of this embodiment has an inter-cell interference control function in the time domain. That is, for example, the macro base station 1 sets ABS (non-transmission period in which data is not transmitted, protection subframe) for each subframe, and information indicating which subframe is set as the protection subframe (ABS) is ABS.
  • ABS non-transmission period in which data is not transmitted, protection subframe
  • ABS protection subframe
  • the pico base station 10 is notified as a pattern.
  • the pico base station 10 assigns resources to the user apparatus based on the ABS pattern notified from the macro base station 1.
  • the communication system according to the present embodiment has a function of setting a common ABS pattern among a plurality of macro base stations that exert strong interference on the user equipment connected to the pico base station.
  • one or a plurality of user apparatuses connected to the pico base station 10 measure a received signal (reference signal) received from a plurality of surrounding macro base stations,
  • the measurement result (measurement report) is notified to the pico base station 10.
  • the notified measurement result includes the macro base station identification information (PCI) and the measurement result for each macro base station to be measured.
  • the pico base station 10 identifies a macro base station that exerts strong interference on the user apparatus based on the measurement result notified from the user apparatus, and the identification information of the identified macro base station is indicated by the identification information. It transmits to one macro base station (in this example, macro base station 1 as shown in FIG. 2) among the base stations.
  • the macro base station 1 notifies, for example, the ABS pattern used by itself to other macro base stations (in this example, the macro base stations 2 and 3) corresponding to the notified identification information.
  • the base station sets the notified ABS pattern.
  • a common ABS pattern can be set between macro base stations that exert strong interference on user apparatuses connected to the pico base station 10. The processing content for setting a common ABS pattern will be described in more detail below.
  • FIG. 3 shows a functional configuration diagram of the macro base station 1.
  • the macro base station 1 includes an ABS pattern setting unit 11, an ABS pattern storage unit 12, an ABS pattern transmission unit 13, an ABS pattern reception unit 14, and a macro interference base station information reception unit 15.
  • the ABS pattern setting unit 11 is a functional unit for setting an ABS pattern.
  • the ABS pattern can be set based on the ABS status received from the pico base station 10 after the system operator sets a predetermined pattern as an initial value, for example.
  • the ABS pattern setting unit 11 sends an ABS pattern (an ABS pattern to be set in common with the other macro base station) from another macro base station via the ABS pattern receiving unit 14. When received, it has a function of setting the received ABS pattern as its own ABS pattern and storing it in the ABS pattern storage unit 12.
  • the ABS pattern stored in the ABS pattern storage unit 12 is used for notification to the pico base station 10 by the ABS pattern transmission unit 13, scheduling for user devices belonging to the macro base station 1, and the like. Further, when the macro base station 1 is the source of the ABS pattern to be set in common, the ABS pattern stored in the ABS pattern storage unit 12 is notified to other macro base stations as the ABS pattern to be set in common. can do.
  • the ABS pattern receiving unit 14 is a functional unit that receives ABS patterns to be set in common from other macro base stations.
  • the macro interference base station information receiving unit 15 receives macro interference base station information including identification information (a PCI set in this embodiment) of a plurality of macro base stations that are causing strong interference with the pico cell from the pico base station 10. And a functional unit that is passed to the ABS pattern transmission unit 13.
  • identification information a PCI set in this embodiment
  • the ABS pattern transmission unit 13 receives the macro interference base station information received from the pico base station 10 from the macro interference base station information reception unit 15, and is included in the macro base station identification information included in the macro interference base station information ( The ABS pattern of the macro base station 1 stored in the ABS pattern storage unit 12 is transmitted to the macro base station corresponding to the identification information other than the macro base station 1).
  • the ABS pattern of the macro base station 1 is notified to other macro base stations as an ABS pattern to be set in common, but this is only an example, and a separately defined ABS pattern is shared. Another macro base station may be notified as an ABS pattern to be set.
  • FIG. 4 shows a functional configuration diagram of the pico base station 10.
  • the pico base station 10 includes a measurement instruction unit 101, a measurement result reception unit 102, a scheduling unit 103, a macro interference base station determination unit 104, a macro interference base station information transmission unit 105, and an ABS pattern reception unit 106.
  • the ABS pattern storage unit 107 is provided.
  • the measurement instruction unit 101 is a functional unit that transmits a measurement instruction signal instructing to perform reception signal (reference signal) measurement to the user device.
  • the measurement instruction signal is transmitted as, for example, an RRC signaling signal (RRC connection reconfiguration message or the like).
  • the measurement instruction signal according to the present embodiment can include instruction information for instructing a specific user apparatus to perform measurement of signals from surrounding macro base stations determined in advance by the user apparatus.
  • the predetermined peripheral macro base station is a macro base station that may cause strong interference to the user equipment connected to the pico base station. As an example, a macro base station located within a predetermined distance from the pico base station It can be determined as a station.
  • the measurement result receiving unit 102 is a functional unit that receives a measurement result (measurement report) from each user device.
  • the scheduling unit 103 has a function of performing scheduling for allocating a specific data communication resource to a specific user device based on a measurement result or an ABS pattern returned from each user device.
  • the macro interference base station determination unit 104 is a macro that exerts strong interference on the user equipment connected to the pico base station based on the measurement result received from the user equipment that has performed reception signal measurement from the neighboring macro base stations.
  • the base station is specified, and the specified result is passed to the macro interference base station information transmission unit 105 as a set of identification information of the macro base station that causes strong interference.
  • the measurement instruction unit 101 causes a specific user device (for example, one or a plurality of user devices whose reception quality is lower than a predetermined value) to measure a signal from a neighboring macro base station, and receives the signal from the user device.
  • a macro interference base station can be determined based on the measurement result.
  • the measurement results used for the determination of the macro interference base station are not limited to this, and in any scene as long as the measurement results of signals from neighboring macro base stations are included. The measurement result may be used.
  • the measurement result received from the user apparatus 20 includes macro base station identification information (PCI in this example) and the measurement result value for each macro base station to be measured.
  • the value of the measurement result is, for example, RSRP (Reference signal received power), RSRQ (Reference signal Received Quality), or the like.
  • the macro interference base station determination unit 104 determines, as macro interference base stations, a plurality of macro base stations whose reception level as a measurement result is higher than a predetermined value.
  • the macro interference base station is a macro base station that exerts strong interference on the user equipment connected to the pico base station, and the macro interference base station determination method uses the reception level in this way.
  • any method that can appropriately determine the macro interference base station from the measurement result may be used.
  • the macro interference base station information transmission unit 105 is a functional unit that transmits a set of macro interference base station identification information received from the macro interference base station determination unit 104 to one macro base station as macro interference base station information.
  • a destination macro base station for transmitting the macro interference base station information it may be transmitted to any one of the macro base stations identified by the identification information included in the macro interference base station information.
  • the pico base station may be a macro base station that receives the ABS pattern notification.
  • the ABS pattern receiving unit 106 has a function of receiving the ABS pattern included in the load information (Load Information) from the macro base station 1 and storing it in the ABS pattern storage unit 107.
  • the ABS pattern stored in the ABS pattern storage unit 107 is used for scheduling processing by the scheduling unit 03.
  • the functions of the macro base station 1 and the pico base station 10 described above may each be realized by a hardware circuit, or correspond to the functions described in this embodiment in a computer having a CPU and a memory. You may implement
  • the measurement result receiving unit 102 of the pico base station 10 receives the measurement result (measurement report) of the received signal from the neighboring macro base station from the user device 20 (step 1).
  • the measurement result for one neighboring macro base station may be received a plurality of times for each neighboring macro base station, and a plurality of neighboring macro base stations are included in one measurement result.
  • the measurement result may be included.
  • the macro interference base station determination unit 104 of the pico base station 10 determines a macro base station (macro interference base station) that exerts strong interference on the user apparatus 20 from the measurement result received from the user apparatus 20 ( Step 2).
  • the macro interference base station determination unit 104 determines a neighboring macro base station whose reception level is higher than a predetermined value as a macro interference base station.
  • macro base stations 1, 2, and 3 having PCI # 1, # 2, and # 3 as identification information are determined as macro interference base stations.
  • PCI # 1, # 2, and # 3 that are identification information of the macro base stations 1, 2, and 3 are passed from the macro interference base station determination unit 104 to the macro interference base station information transmission unit 105.
  • the macro interference base station information transmitting unit 105 that has received PCI # 1, # 2, and # 3 as identification information of the macro interference base station receives macro interference base station information including PCI # 1, # 2, and # 3, for example,
  • the base station signaling signal (Load ⁇ Information) is transmitted to the macro base station 1 (step 3).
  • the transmission destination may be any one of the macro base stations 1, 2, and 3 identified by PCI # 1, # 2, and # 3.
  • the macro base station 1 (For example, the macro base station with the shortest distance, the macro base station that is the transmission source of the ABS pattern used by the pico base station, and the like).
  • FIG. 6A shows an example of an information element of Load Information message of inter-base station signaling signal (X2AP signaling) including the case of notifying such macro interference base station information.
  • Interference Cell Information and “PCI” defined in the last two lines of the information elements shown in FIG. 6A are information elements related to notification of macro interference base station information.
  • FIG. 6B shows Invoke ⁇ ⁇ ⁇ ⁇ Indication ⁇ IE in the case of reporting macro interference base station information.
  • “Interference Cell Information” relates to macro interference base station information notification.
  • the macro interference base station information receiving unit 15 in the macro base station 1 receives the macro interference base station information.
  • the macro interference base station information received by the macro interference base station information reception unit 15 is passed to the ABS pattern transmission unit 13.
  • the ABS pattern transmission unit 13 determines a destination macro base station that transmits an ABS pattern to be set in common (step). 4).
  • the macro interference base station information is PCI # 1, # 2, # 3
  • the ABS pattern transmission unit 13 determines the macro base stations 2, 3 identified by PCI # 2, # 3. It is determined that the ABS pattern that should be set in common is transmitted.
  • ABS pattern used by the macro base station 1 is used as the ABS pattern to be set in common, but the ABS pattern to be set in common is not limited to this.
  • the ABS pattern transmitting unit 13 that has determined the transmission destination macro base station for transmitting the ABS pattern to be set in common uses the ABS pattern to be set in common (used by the macro base station 1 from the ABS pattern storage unit 12). (ABS pattern) is read out, and the ABS pattern is transmitted to the macro base stations 2 and 3 (steps 5 and 6).
  • an inter-base station signaling signal (Load Information) is used.
  • Each macro base station that has received the ABS pattern to be set in common sets the ABS pattern as the ABS pattern to be used, and notifies the subordinate pico base station of the ABS pattern with, for example, Load IV Information.
  • the macro base stations 1 to 3 that exert strong interference on the user equipment connected to the pico base station 10 can be identified, and a common ABS pattern can be set only between the identified macro base stations 1 to 3 can do.
  • the pico base station 10 performs scheduling in consideration of the ABS pattern for the user apparatus to be connected, so that the user apparatus connected to the pico base station 10 avoids interference from the macro base stations 1 to 3. Communication can be performed.
  • ABS pattern storage unit 1 to 3 Macro base station 10 Pico base station 20 User equipment 11 ABS pattern setting unit 12 ABS pattern storage unit 13 ABS pattern transmission unit 14 ABS pattern reception unit 15 Macro interference base station information reception unit 101 Measurement instruction unit 102 Measurement result reception unit 103 Scheduling unit 104 Macro interference base station determination unit 105 Macro interference base station information transmission unit 106 ABS pattern reception unit 107 ABS pattern storage unit

Abstract

Provided is a base station being used as the second base station in a mobile communications system comprising a first base station and a second base station, wherein a protected subframe group is set on the first base station, and pattern information which denotes the protected subframe group is issued from the first base station to the second base station. The base station further comprises: a measurement result receiving means for receiving from a user device connected to the base station results of measurement of received signals for which a plurality of the first base stations are the measurement subjects; an interfering base station determination means for determining a plurality of first base stations which are interfering with the user device on the basis of the measurement results received by the measurement result receiving means; and an interfering base station information transmission means for transmitting to a prescribed first base station identifying information which identifies the plurality of first base stations which are determined by the interfering base station determination means.

Description

基地局、及び干渉基地局情報送信方法Base station and interference base station information transmission method
　本発明は、移動通信システムに係り、特に、ヘテロジニアスネットワークにおいて、複数の基地局間で共通のABS(Almost Blank Subframe)パターンを設定するための技術に関するものである。 The present invention relates to a mobile communication system, and more particularly, to a technique for setting a common ABS (Almost Blank Subframe) pattern among a plurality of base stations in a heterogeneous network.
　3GPP(3rd  Generation Partnership Project)で検討が進められているLTE (Long-Term Evolution)-Advancedでは、局所的に集中する高密度トラフィックを効率的に収容するために、ピコセルなどの様々な形態のセルを用いたヘテロジニアスネットワーク(Heterogeneous Network)と呼ばれる無線アクセスネットワーク(RAN: Radio Access Network)構成が提案されている。 In LTE (Long-Term Evolution) -Advanced, which is being studied by 3GPP (3rd Generation Partnership Project), various types of cells such as picocells are used to efficiently accommodate locally concentrated high-density traffic. A wireless access network (RAN: “Radio Access Network”) configuration called a heterogeneous network (Heterogeneous Network) is proposed.
　ヘテロジニアスネットワークにおいては、マクロ基地局（Macro eNB）により提供される広範囲なマクロセルにオーバーレイして小範囲のピコセルを提供するために、ピコ基地局（Pico-eNB)がマクロ基地局と混在して設置される。 In heterogeneous networks, pico base stations (Pico-eNB) are mixed with macro base stations to provide a small range of pico cells overlaid on a wide range of macro cells provided by macro base stations (Macro eNB). Installed.
　また、ヘテロジニアスネットワークにおいては、ユーザ装置(UE)が積極的にピコ基地局にハンドオーバするようパラメータを設定し、ユーザ装置に対してシグナリングを行うことにより、ピコ基地局のセル半径を実質的に大きくするCRE（Cell Range Expansion）技術が提案されている。 Also, in the heterogeneous network, the user equipment (UE) actively sets the parameters so as to hand over to the pico base station, and performs signaling to the user equipment, thereby substantially reducing the cell radius of the pico base station. An increasing CRE (Cell Range Expansion) technology has been proposed.
　しかし、CREを導入した場合、特にピコセルのセル境界に位置するユーザ装置は、マクロ基地局から強い干渉を受けることになる。このようなセル間干渉を低減するためのセル間干渉制御（eICIC: enhanced Inter-Cell Interference Coordination）技術として、キャリアアグリゲーションを用いた周波数領域のセル間干渉制御技術や、時間領域（サブフレーム単位）でのセル間干渉制御技術が提案されている。 However, when CRE is introduced, particularly user equipment located at the cell boundary of the pico cell receives strong interference from the macro base station. As inter-cell interference control (eICIC: enhanced Inter-Cell Interference Coordination) technology to reduce such inter-cell interference, inter-cell interference control technology in the frequency domain using carrier aggregation and time domain (subframe unit) Inter-cell interference control technology has been proposed.
　上述した時間領域でのセル間干渉制御技術では、マクロ基地局においてAlmost Blank Subframe (ABS)と呼ばれるデータを送信しないサブフレーム群（ABSパターンにより示される）が設定され、ABSパターンがマクロ基地局配下のピコ基地局に通知される。ピコ基地局では、ABSパターンを考慮して、配下のユーザ装置に対するリソース割り当て（スケジューリング）を行う。　
　ここで、ピコ基地局により形成されるピコセル（ピコ基地局に接続したユーザ装置）は、１つのマクロ基地局のみならず、複数のマクロ基地局から強い干渉を受ける場合がある。ユーザ装置に複数のマクロ基地局からの干渉を回避した通信を行わせるために、干渉を及ぼしている複数のマクロ基地局において共通のABSパターン（common ABS pattern）を設定し、ピコ基地局は、当該共通のABSパターンに基づいてユーザ装置に対するスケジューリングを行うことが望ましい。複数のマクロ基地局間で共通のABSパターンを設定する通信システムの例を図１に示す。図１には、ピコ基地局P、ユーザ装置U、及びマクロ基地局A、B、Cを含む通信システムにおいて、マクロ基地局A、B、C間で共通のABSパターンが設定された状態が示されている。 In the inter-cell interference control technology in the time domain described above, a subframe group (indicated by the ABS pattern) that does not transmit data called Almost Blank Subframe (ABS) is set in the macro base station, and the ABS pattern is subordinate to the macro base station. To the Pico base station. The pico base station performs resource allocation (scheduling) for subordinate user apparatuses in consideration of the ABS pattern.
Here, a pico cell (a user apparatus connected to the pico base station) formed by the pico base station may receive strong interference from a plurality of macro base stations as well as one macro base station. In order to make the user apparatus perform communication avoiding interference from a plurality of macro base stations, a common ABS pattern is set in a plurality of macro base stations that are causing interference, It is desirable to perform scheduling for the user apparatus based on the common ABS pattern. An example of a communication system for setting a common ABS pattern among a plurality of macro base stations is shown in FIG. FIG. 1 shows a state in which a common ABS pattern is set between the macro base stations A, B, and C in a communication system including the pico base station P, the user equipment U, and the macro base stations A, B, and C. Has been.
　複数のマクロ基地局間で共通のABSパターンを設定する方法の１つの例として、１つのマクロ基地局が、隣接するマクロ基地局に対して自身のABSパターンを通知する方法が提案されている（非特許文献２）。 As an example of a method for setting a common ABS pattern among a plurality of macro base stations, a method has been proposed in which one macro base station notifies its own ABS pattern to an adjacent macro base station ( Non-patent document 2).
　しかしながら、各マクロ基地局は、ピコ基地局に接続するユーザ装置が、どのマクロ基地局から干渉を受けているかを把握し得ないので、例えば上記の方法で複数マクロ基地局間で共通のABSパターンを設定しようとしても、通知元のマクロ基地局は、どのマクロ基地局に通知を行ってよいか判断できない。従って、現状では、ユーザ装置に干渉を及ぼす複数マクロ基地局間で適確に共通のABSパターンを設定することができない。なお、ABSは、ピコセルにおいて保護された（protected)リソースに相当するので、以下では、ABSのことを保護サブフレームとも称する。 However, since each macro base station cannot grasp which macro base station the user apparatus connected to the pico base station is receiving interference with, for example, the ABS pattern common to a plurality of macro base stations by the above method However, the macro base station that is the notification source cannot determine which macro base station may be notified. Therefore, at present, it is not possible to accurately set a common ABS pattern among a plurality of macro base stations that interfere with user apparatuses. Note that since ABS corresponds to a protected resource in a pico cell, hereinafter, ABS is also referred to as a protected subframe.
　本発明は上記の点に鑑みてなされたものであり、マクロ基地局等の第１の基地局で保護サブフレーム群が設定され、保護サブフレーム群を示すパターン情報が、ピコ基地局等の第２の基地局に通知される通信システムにおいて、第２の基地局に接続するユーザ装置に干渉を及ぼす複数の第１の基地局間で共通の保護サブフレーム群パターン情報を設定するために必要な情報を決定し、第１の装置に通知するための技術を提供することを目的とする。 The present invention has been made in view of the above points, and a protection subframe group is set in a first base station such as a macro base station, and pattern information indicating the protection subframe group is stored in a first base station such as a pico base station. Necessary for setting common protection subframe group pattern information among a plurality of first base stations that interfere with user equipment connected to the second base station in the communication system notified to the second base station An object is to provide a technique for determining information and notifying a first apparatus.
　上記の課題を解決するために、本発明の一実施形態によれば、第１の基地局と第２の基地局を備え、当該第１の基地局で保護サブフレーム群が設定され、保護サブフレーム群を示すパターン情報が、前記第１の基地局から前記第２の基地局に通知される移動通信システムにおいて、前記第２の基地局として使用される基地局が提供される。 In order to solve the above-described problem, according to an embodiment of the present invention, a first base station and a second base station are provided, and a protection subframe group is set in the first base station, and a protection subframe is provided. In a mobile communication system in which pattern information indicating a frame group is notified from the first base station to the second base station, a base station used as the second base station is provided.
　上記基地局は、当該基地局に接続されるユーザ装置から、複数の第１の基地局を測定対象とした受信信号の測定結果を受信する測定結果受信手段と、前記測定結果受信手段により受信した測定結果に基づき、前記ユーザ装置に干渉を及ぼす複数の第１の基地局を決定する干渉基地局決定手段と、前記干渉基地局決定手段により決定された複数の第１の基地局を識別する識別情報を、所定の第１の基地局に送信する干渉基地局情報送信手段とを備えて構成される。 The base station receives, from the user equipment connected to the base station, a measurement result receiving unit that receives a measurement result of a received signal with a plurality of first base stations as measurement targets, and the measurement result receiving unit Based on the measurement result, an interference base station determination unit that determines a plurality of first base stations that interfere with the user apparatus, and an identification that identifies the plurality of first base stations determined by the interference base station determination unit Interfering base station information transmitting means for transmitting information to a predetermined first base station.
　前記干渉基地局情報送信手段により前記所定の第１の基地局に送信される識別情報は、例えば、前記所定の第１の基地局において、前記干渉基地局決定手段により決定された複数の第１の基地局間で、共通の保護サブフレーム群パターン情報を設定するために使用される識別情報である。 The identification information transmitted to the predetermined first base station by the interference base station information transmission means is, for example, a plurality of first information determined by the interference base station determination means in the predetermined first base station. Identification information used for setting common protection subframe group pattern information between the base stations.
　また、本発明の一実施形態によれば、第１の基地局と第２の基地局を備え、当該第１の基地局で保護サブフレーム群が設定され、保護サブフレーム群を示すパターン情報が、前記第１の基地局から前記第２の基地局に通知される移動通信システムにおいて、前記第２の基地局として使用される基地局における干渉基地局情報送信方法が提供される。 In addition, according to an embodiment of the present invention, a first base station and a second base station are provided, a protection subframe group is set in the first base station, and pattern information indicating the protection subframe group is provided. In the mobile communication system notified from the first base station to the second base station, there is provided an interference base station information transmission method in a base station used as the second base station.
　上記干渉基地局情報送信方法は、前記基地局に接続されるユーザ装置から、複数の第１の基地局を測定対象とした受信信号の測定結果を受信する測定結果受信ステップと、前記測定結果受信ステップにより受信した測定結果に基づき、前記ユーザ装置に干渉を及ぼす複数の第１の基地局を決定する干渉基地局決定ステップと、前記干渉基地局決定ステップにより決定された複数の第１の基地局を識別する識別情報を、所定の第１の基地局に送信する干渉基地局情報送信ステップとを備えて構成される。 The interference base station information transmission method includes a measurement result receiving step of receiving measurement results of received signals with a plurality of first base stations as measurement targets from a user apparatus connected to the base station, and the measurement result reception An interference base station determination step for determining a plurality of first base stations that interfere with the user apparatus based on the measurement results received in the step; and a plurality of first base stations determined by the interference base station determination step Interfering base station information transmitting step for transmitting identification information for identifying to a predetermined first base station.
　本発明の実施形態によれば、マクロ基地局等の第１の基地局で保護サブフレーム群が設定され、保護サブフレーム群を示すパターン情報が、ピコ基地局等の第２の基地局に通知される通信システムにおいて、第２の基地局に接続するユーザ装置に干渉を及ぼす複数の第１の基地局間で共通の保護サブフレーム群パターン情報を設定するために必要な情報を決定し、第１の基地局に通知するための技術を提供することが可能となる。 According to the embodiment of the present invention, a protection subframe group is set in a first base station such as a macro base station, and pattern information indicating the protection subframe group is notified to a second base station such as a pico base station. Determining information necessary for setting common protection subframe group pattern information among a plurality of first base stations that interfere with a user equipment connected to a second base station, It is possible to provide a technique for notifying one base station.
共通のABSパターンを設定する場合の例を示す図である。It is a figure which shows the example in the case of setting a common ABS pattern. 本発明の実施の形態に係る通信システムの構成図である。It is a block diagram of the communication system which concerns on embodiment of this invention. マクロ基地局１の機能構成図である。2 is a functional configuration diagram of a macro base station 1. FIG. ピコ基地局１０の機能構成図である。2 is a functional configuration diagram of a pico base station 10. FIG. 本発明の実施の形態に係る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。It is a sequence diagram for demonstrating operation | movement of the communication system which concerns on embodiment of this invention. 基地局間シグナリング信号における情報要素を示す図である。It is a figure which shows the information element in the signaling signal between base stations. 基地局間シグナリング信号における情報要素を示す図である。It is a figure which shows the information element in the signaling signal between base stations.
　以下、図面を参照して本発明の実施の形態を説明する。 Hereinafter, embodiments of the present invention will be described with reference to the drawings.
　　　(システム構成）
　図２に、本発明の実施の形態に係る通信システム（移動通信システム）の構成を示す。図２に示すように、本実施の形態に係る通信システムは、それぞれが１つのマクロセル（Macro-cell）を形成する複数のマクロ基地局(Macro eNB)１～３と、マクロ基地局１が形成するマクロセルにオーバーレイしたピコセル(Pico-cell)を形成するピコ基地局(Pico eNB)１０とを含み、ヘテロジニアスネットワークを構成している。各基地局間は、有線もしくは無線により通信可能に接続されている。 (System configuration)
FIG. 2 shows a configuration of a communication system (mobile communication system) according to the embodiment of the present invention. As shown in FIG. 2, in the communication system according to the present embodiment, a plurality of macro base stations (Macro eNB) 1 to 3 each forming one macro cell (Macro-cell) and a macro base station 1 are formed. And a pico base station (Pico eNB) 10 that forms a pico cell (Pico-cell) overlaid on the macro cell to form a heterogeneous network. Each base station is connected to be communicable by wire or wireless.
　図２には、ピコセルに属しているユーザ装置(UE)の一例として、ユーザ装置２０が示されている。図２には、ユーザ装置２０はピコセルから離れた位置に描かれているが、これは図示の便宜上のものであり、ユーザ装置２０は、ピコセル内にあって、複数のマクロ基地局１～３から強い干渉を受けているユーザ装置であるものとする。また、各マクロセルには、複数のピコ基地局が存在し、各ピコセルには複数のユーザ装置が存在してよいが、図２には、便宜上、１つのピコ基地局１０及び１つのユーザ装置２０を示している。また、図２には、各マクロセル（各マクロ基地局）の識別情報であるPCI（Physical Cell Identifier）が示されている。 FIG. 2 shows a user apparatus 20 as an example of a user apparatus (UE) belonging to a pico cell. In FIG. 2, the user equipment 20 is depicted at a position away from the pico cell, but this is for convenience of illustration, and the user equipment 20 is in the pico cell and includes a plurality of macro base stations 1 to 3. It is assumed that the user apparatus is receiving strong interference from the user. Each macro cell may include a plurality of pico base stations, and each pico cell may include a plurality of user apparatuses. However, in FIG. 2, one pico base station 10 and one user apparatus 20 are shown for convenience. Is shown. FIG. 2 also shows PCI (Physical Cell Identifier) that is identification information of each macro cell (each macro base station).
　本実施の形態の通信システムは、LTE／LTE-Advancedの方式に基づく通信システムであるとするが、本発明はこの例に限定されず、ABS等の保護リソース（protected resources）が設定される他の通信システムに適用されてもよい。 The communication system according to the present embodiment is a communication system based on the LTE / LTE-Advanced scheme. However, the present invention is not limited to this example, and protected resources (protected resources) such as ABS are set. It may be applied to the communication system.
　ユーザ装置（UE）は、具体的には、携帯電話機、情報端末、スマートフォン、パーソナルディジタルアシスタント、携帯用パーソナルコンピュータ等であるが、これらに限定されない。また、本実施の形態でのユーザ装置は、後述するように、例えばピコ基地局１０からの測定指示に基づいて、周辺マクロ基地局からの受信信号の測定(measurement)を行って、測定結果(measurement report)をピコ基地局１０に通知する機能を備えている。 Specifically, the user apparatus (UE) is a mobile phone, an information terminal, a smartphone, a personal digital assistant, a portable personal computer, or the like, but is not limited thereto. Further, as will be described later, the user apparatus according to the present embodiment performs measurement of a received signal from a neighboring macro base station, for example, based on a measurement instruction from the pico base station 10, and the measurement result ( a function of notifying the pico base station 10 of measurement (report).
　＜通信システムの概要＞
　本実施の形態に係る通信システムでは、各基地局が、ユーザ装置（UE)に対して、1つ以上のリソースブロック（RB:　Resource　Block）を割り当てることで、下りリンク及び上りリンクの通信が行われる。システムを構成する複数のリソースブロックを多数のユーザ装置で共有する。また、本実施の形態に係る通信システムでは、時間領域において例えば１０サブフレーム（例えば１サブフレームは1ms）からなる無線フレームが構成されている。１リソースブロックは、例えば、１サブフレームの半分である１スロットと、周波数領域での所定数のサブキャリアから構成される。 <Outline of communication system>
In the communication system according to the present embodiment, each base station allocates one or more resource blocks (RBs) to a user apparatus (UE), thereby performing downlink and uplink communication. Is called. A plurality of resource blocks constituting the system are shared by many user apparatuses. Further, in the communication system according to the present embodiment, a radio frame including, for example, 10 subframes (for example, 1 subframe is 1 ms) is configured in the time domain. One resource block includes, for example, one slot that is half of one subframe and a predetermined number of subcarriers in the frequency domain.
　下りリンクにおけるシンボルは、OFDM方式により生成されたシンボルである。上りリンクにおけるシンボルは、SC－FDMA方式（又はSpread－DFT）方式により生成されたシンボルである。基地局は、例えば、1msのサブフレーム毎に、複数のユーザ装置の内どのユーザ装置にリソースを割り当てるかを決定する。無線リソースの割り当てを決定する処理はスケジューリングと呼ばれる。 The symbol in the downlink is a symbol generated by the OFDM method. The symbol in the uplink is a symbol generated by the SC-FDMA method (or Spread-DFT) method. For example, the base station determines to which user apparatus among a plurality of user apparatuses a resource is allocated for each sub-frame of 1 ms. The process of determining radio resource allocation is called scheduling.
　本実施の形態の通信システムは、時間領域でのセル間干渉制御機能を有する。すなわち、例えば、マクロ基地局１がサブフレーム毎にABS（データを送信しない無送信区間、保護サブフレーム）を設定し、どのサブフレームを保護サブフレーム(ABS)として設定したかを示す情報をABSパターンとしてピコ基地局１０に通知する。ピコ基地局１０では、マクロ基地局１から通知されたABSパターンに基づいて、ユーザ装置に対するリソースの割り当てを行う。 The communication system of this embodiment has an inter-cell interference control function in the time domain. That is, for example, the macro base station 1 sets ABS (non-transmission period in which data is not transmitted, protection subframe) for each subframe, and information indicating which subframe is set as the protection subframe (ABS) is ABS. The pico base station 10 is notified as a pattern. The pico base station 10 assigns resources to the user apparatus based on the ABS pattern notified from the macro base station 1.
　また、本実施の形態の通信システムは、ピコ基地局に接続するユーザ装置に対して強い干渉を及ぼす複数のマクロ基地局間で共通のABSパターンを設定する機能を備える。 In addition, the communication system according to the present embodiment has a function of setting a common ABS pattern among a plurality of macro base stations that exert strong interference on the user equipment connected to the pico base station.
　すなわち、本実施の形態では、ピコ基地局１０に接続される１つ又は複数のユーザ装置が、周辺の複数のマクロ基地局から受信する受信信号（reference signal）の測定（measurement)を行い、その測定結果（measurement report）をピコ基地局１０に通知する。通知される測定結果には、測定対象となったマクロ基地局毎に、マクロ基地局の識別情報(PCI)と測定結果が含まれている。ピコ基地局１０は、ユーザ装置から通知された測定結果に基づいて、ユーザ装置に強い干渉を及ぼしているマクロ基地局を特定し、特定されたマクロ基地局の識別情報を、識別情報で示される基地局の中の１つのマクロ基地局（図２に示すように、本例ではマクロ基地局１）に送信する。 That is, in the present embodiment, one or a plurality of user apparatuses connected to the pico base station 10 measure a received signal (reference signal) received from a plurality of surrounding macro base stations, The measurement result (measurement report) is notified to the pico base station 10. The notified measurement result includes the macro base station identification information (PCI) and the measurement result for each macro base station to be measured. The pico base station 10 identifies a macro base station that exerts strong interference on the user apparatus based on the measurement result notified from the user apparatus, and the identification information of the identified macro base station is indicated by the identification information. It transmits to one macro base station (in this example, macro base station 1 as shown in FIG. 2) among the base stations.
　その後、マクロ基地局１は、例えば、自身で用いているABSパターンを、通知された識別情報に対応する他のマクロ基地局（本例では、マクロ基地局２、３）に通知し、各マクロ基地局は、通知されたABSパターンを設定する。これにより、ピコ基地局１０に接続されるユーザ装置に強い干渉を及ぼすマクロ基地局間で共通のABSパターンを設定することができる。共通のABSパターンを設定するための処理内容については以下において、より詳細に説明する。 Thereafter, the macro base station 1 notifies, for example, the ABS pattern used by itself to other macro base stations (in this example, the macro base stations 2 and 3) corresponding to the notified identification information. The base station sets the notified ABS pattern. Thereby, a common ABS pattern can be set between macro base stations that exert strong interference on user apparatuses connected to the pico base station 10. The processing content for setting a common ABS pattern will be described in more detail below.
　　＜マクロ基地局及びピコ基地局の機能構成＞
　次に、マクロ基地局１及びピコ基地局１０の機能構成例を説明する。以下で説明する機能構成例は、本発明に係る機能を主に示すものであり、マクロ基地局１及びピコ基地局１０のそれぞれにおいて、説明する機能以外に、LTE／LTE-Advancedの方式に準拠した基地局の動作を実現するために必要な機能が備えられていることはいうまでもない。また、マクロ基地局に関し、複数のマクロ基地局１～３は同様の機能構成を有するので、代表してマクロ基地局１について説明している。 <Functional configuration of macro base station and pico base station>
Next, functional configuration examples of the macro base station 1 and the pico base station 10 will be described. The functional configuration examples described below mainly show the functions according to the present invention, and comply with the LTE / LTE-Advanced scheme in addition to the functions described in each of the macro base station 1 and the pico base station 10. It goes without saying that the functions necessary for realizing the operation of the base station are provided. Further, regarding the macro base station, since the plurality of macro base stations 1 to 3 have the same functional configuration, the macro base station 1 is described as a representative.
　図３に、マクロ基地局１の機能構成図を示す。図３に示すように、マクロ基地局１は、ABSパターン設定部１１、ABSパターン格納部１２、ABSパターン送信部１３、ABSパターン受信部１４、マクロ干渉基地局情報受信部１５を備える。 FIG. 3 shows a functional configuration diagram of the macro base station 1. As shown in FIG. 3, the macro base station 1 includes an ABS pattern setting unit 11, an ABS pattern storage unit 12, an ABS pattern transmission unit 13, an ABS pattern reception unit 14, and a macro interference base station information reception unit 15.
　ABSパターン設定部１１は、ABSパターンを設定するための機能部である。ABSパターンは、例えば、初期値としてシステム運用者により所定のパターンを設定し、その後、ピコ基地局１０から受信するABSステータスに基づいて再設定することができる。また、特に本実施の形態においては、ABSパターン設定部１１は、ABSパターン受信部１４を介して他のマクロ基地局からABSパターン（当該他のマクロ基地局と共通に設定すべきABSパターン）を受信した場合に、受信したABSパターンを自身のABSパターンとして設定し、それをABSパターン格納部１２に格納する機能を備える。 The ABS pattern setting unit 11 is a functional unit for setting an ABS pattern. The ABS pattern can be set based on the ABS status received from the pico base station 10 after the system operator sets a predetermined pattern as an initial value, for example. In particular, in the present embodiment, the ABS pattern setting unit 11 sends an ABS pattern (an ABS pattern to be set in common with the other macro base station) from another macro base station via the ABS pattern receiving unit 14. When received, it has a function of setting the received ABS pattern as its own ABS pattern and storing it in the ABS pattern storage unit 12.
　ABSパターン格納部１２に格納されたABSパターンは、ABSパターン送信部１３によるピコ基地局１０への通知、及びマクロ基地局１に属するユーザ装置に対するスケジューリング等に用いられる。また、マクロ基地局１が、共通に設定すべきABSパターンの送信元となる場合は、ABSパターン格納部１２に格納されたABSパターンを、共通に設定するABSパターンとして他のマクロ基地局に通知することができる。 The ABS pattern stored in the ABS pattern storage unit 12 is used for notification to the pico base station 10 by the ABS pattern transmission unit 13, scheduling for user devices belonging to the macro base station 1, and the like. Further, when the macro base station 1 is the source of the ABS pattern to be set in common, the ABS pattern stored in the ABS pattern storage unit 12 is notified to other macro base stations as the ABS pattern to be set in common. can do.
　ABSパターン受信部１４は、他のマクロ基地局から、共通に設定すべきABSパターンを受信する機能部である。 The ABS pattern receiving unit 14 is a functional unit that receives ABS patterns to be set in common from other macro base stations.
　マクロ干渉基地局情報受信部１５は、ピコ基地局１０から、ピコセルに強い干渉を及ぼしている複数のマクロ基地局の識別情報（本実施形態ではPCIのセット）を含むマクロ干渉基地局情報を受信し、ABSパターン送信部１３に渡す機能部である。 The macro interference base station information receiving unit 15 receives macro interference base station information including identification information (a PCI set in this embodiment) of a plurality of macro base stations that are causing strong interference with the pico cell from the pico base station 10. And a functional unit that is passed to the ABS pattern transmission unit 13.
　ABSパターン送信部１３は、ピコ基地局１０から受信したマクロ干渉基地局情報をマクロ干渉基地局情報受信部１５から受け取り、マクロ干渉基地局情報に含まれるマクロ基地局の識別情報のうちの自分（マクロ基地局１）以外の識別情報に対応するマクロ基地局に対し、ABSパターン格納部１２に格納されているマクロ基地局１のABSパターンを送信する。 The ABS pattern transmission unit 13 receives the macro interference base station information received from the pico base station 10 from the macro interference base station information reception unit 15, and is included in the macro base station identification information included in the macro interference base station information ( The ABS pattern of the macro base station 1 stored in the ABS pattern storage unit 12 is transmitted to the macro base station corresponding to the identification information other than the macro base station 1).
　なお、本例では、マクロ基地局１のABSパターンを、共通に設定すべきABSパターンとして他のマクロ基地局に通知しているが、これは一例に過ぎず、別に定めたABSパターンを共通に設定すべきABSパターンとして他のマクロ基地局に通知してもよい。 In this example, the ABS pattern of the macro base station 1 is notified to other macro base stations as an ABS pattern to be set in common, but this is only an example, and a separately defined ABS pattern is shared. Another macro base station may be notified as an ABS pattern to be set.
　図４に、ピコ基地局１０の機能構成図を示す。図４に示すように、ピコ基地局１０は、測定指示部１０１、測定結果受信部１０２、スケジューリング部１０３、マクロ干渉基地局決定部１０４、マクロ干渉基地局情報送信部１０５、ABSパターン受信部１０６、ABSパターン格納部１０７を備える。 FIG. 4 shows a functional configuration diagram of the pico base station 10. As shown in FIG. 4, the pico base station 10 includes a measurement instruction unit 101, a measurement result reception unit 102, a scheduling unit 103, a macro interference base station determination unit 104, a macro interference base station information transmission unit 105, and an ABS pattern reception unit 106. The ABS pattern storage unit 107 is provided.
　測定指示部１０１は、受信信号（reference signal）測定を行うことを指示する測定指示信号をユーザ装置に送信する機能部である。当該測定指示信号は、例えば、RRCシグナリング信号（RRC connection reconfiguration message等）として送信される。本実施の形態に係る測定指示信号には、特定のユーザ装置に対して、そのユーザ装置が予め定めた周辺のマクロ基地局からの信号の測定を行うことを指示する指示情報を含めることができる。予め定めた周辺のマクロ基地局とは、ピコ基地局に接続するユーザ装置に強い干渉を及ぼす可能性があるマクロ基地局であり、一例として、ピコ基地局から予め定めた距離内にあるマクロ基地局として定めることができる。 The measurement instruction unit 101 is a functional unit that transmits a measurement instruction signal instructing to perform reception signal (reference signal) measurement to the user device. The measurement instruction signal is transmitted as, for example, an RRC signaling signal (RRC connection reconfiguration message or the like). The measurement instruction signal according to the present embodiment can include instruction information for instructing a specific user apparatus to perform measurement of signals from surrounding macro base stations determined in advance by the user apparatus. . The predetermined peripheral macro base station is a macro base station that may cause strong interference to the user equipment connected to the pico base station. As an example, a macro base station located within a predetermined distance from the pico base station It can be determined as a station.
　測定結果受信部１０２は、各ユーザ装置から測定結果（measurement report)を受信する機能部である。 The measurement result receiving unit 102 is a functional unit that receives a measurement result (measurement report) from each user device.
　スケジューリング部１０３は、各ユーザ装置から返される測定結果やABSパターン等に基づき、特定のユーザ装置に、特定のデータ通信用リソースを割り当てるスケジューリングを行う機能を有する。 The scheduling unit 103 has a function of performing scheduling for allocating a specific data communication resource to a specific user device based on a measurement result or an ABS pattern returned from each user device.
　マクロ干渉基地局決定部１０４は、周辺マクロ基地局からの受信信号測定を行ったユーザ装置から受信する測定結果に基づいて、ピコ基地局に接続したユーザ装置に対して強い干渉を及ぼしているマクロ基地局を特定し、特定した結果を、強い干渉を及ぼすマクロ基地局の識別情報のセットとしてマクロ干渉基地局情報送信部１０５に渡す。 The macro interference base station determination unit 104 is a macro that exerts strong interference on the user equipment connected to the pico base station based on the measurement result received from the user equipment that has performed reception signal measurement from the neighboring macro base stations. The base station is specified, and the specified result is passed to the macro interference base station information transmission unit 105 as a set of identification information of the macro base station that causes strong interference.
　例えば、測定指示部１０１により、周辺マクロ基地局からの信号の測定を特定のユーザ装置（例えば、受信品質が所定値より悪い１つ又は複数のユーザ装置）に行わせ、当該ユーザ装置から受信する測定結果に基づいてマクロ干渉基地局を決定することができる。ただし、マクロ干渉基地局の決定のために使用する測定結果は、これに限られるわけではなく、周辺マクロ基地局からの信号の測定結果が含まれているものであれば、どのような場面での測定結果を用いることとしてもよい。 For example, the measurement instruction unit 101 causes a specific user device (for example, one or a plurality of user devices whose reception quality is lower than a predetermined value) to measure a signal from a neighboring macro base station, and receives the signal from the user device. A macro interference base station can be determined based on the measurement result. However, the measurement results used for the determination of the macro interference base station are not limited to this, and in any scene as long as the measurement results of signals from neighboring macro base stations are included. The measurement result may be used.
　本実施の形態において、ユーザ装置２０から受信する測定結果には、測定対象のマクロ基地局毎に、マクロ基地局の識別情報（本例ではPCI）と、測定結果の値が含まれている。測定結果の値は、例えば、RSRP（Reference signal received power）、RSRQ（Reference Signal Received Quality）等である。マクロ干渉基地局決定部１０４は、例えば、測定結果としての受信レベルが予め定めた値よりも高い複数のマクロ基地局をマクロ干渉基地局として決定する。なお、マクロ干渉基地局とは、ピコ基地局に接続しているユーザ装置に対して強い干渉を及ぼすマクロ基地局のことであり、マクロ干渉基地局の決定方法はこのように受信レベルを用いる方法に限られず、測定結果から適切にマクロ干渉基地局を決定できるいかなる方法を用いてもよい。 In the present embodiment, the measurement result received from the user apparatus 20 includes macro base station identification information (PCI in this example) and the measurement result value for each macro base station to be measured. The value of the measurement result is, for example, RSRP (Reference signal received power), RSRQ (Reference signal Received Quality), or the like. For example, the macro interference base station determination unit 104 determines, as macro interference base stations, a plurality of macro base stations whose reception level as a measurement result is higher than a predetermined value. The macro interference base station is a macro base station that exerts strong interference on the user equipment connected to the pico base station, and the macro interference base station determination method uses the reception level in this way. However, any method that can appropriately determine the macro interference base station from the measurement result may be used.
　マクロ干渉基地局情報送信部１０５は、マクロ干渉基地局決定部１０４から受け取ったマクロ干渉基地局の識別情報のセットをマクロ干渉基地局情報として１つのマクロ基地局に送信する機能部である。ここで、マクロ干渉基地局情報を送信する送信先のマクロ基地局としては、マクロ干渉基地局情報に含まれる識別情報で識別されるマクロ基地局のうちのどのマクロ基地局に送信してもよい。また、例えば、マクロ干渉基地局情報の中に識別情報が含まれるか否かにかかわらず、ピコ基地局がABSパターンの通知を受けるマクロ基地局を通知先としてもよい。 The macro interference base station information transmission unit 105 is a functional unit that transmits a set of macro interference base station identification information received from the macro interference base station determination unit 104 to one macro base station as macro interference base station information. Here, as a destination macro base station for transmitting the macro interference base station information, it may be transmitted to any one of the macro base stations identified by the identification information included in the macro interference base station information. . Further, for example, regardless of whether identification information is included in the macro interference base station information, the pico base station may be a macro base station that receives the ABS pattern notification.
　ABSパターン受信部１０６は、マクロ基地局１からロード情報（Load Information)に含められたABSパターンを受信し、それをABSパターン格納部１０７に格納する機能を有する。ABSパターン格納部１０７に格納されたABSパターンは、スケジューリング部０３により、スケジューリング処理に用いられる。 The ABS pattern receiving unit 106 has a function of receiving the ABS pattern included in the load information (Load Information) from the macro base station 1 and storing it in the ABS pattern storage unit 107. The ABS pattern stored in the ABS pattern storage unit 107 is used for scheduling processing by the scheduling unit 03.
　上述したマクロ基地局１の機能及びピコ基地局１０の機能はそれぞれ、ハードウェア回路で実現してもよいし、CPUとメモリ等を備えたコンピュータに、本実施の形態で説明する機能に対応するプログラムを実行させることにより実現してもよい。 The functions of the macro base station 1 and the pico base station 10 described above may each be realized by a hardware circuit, or correspond to the functions described in this embodiment in a computer having a CPU and a memory. You may implement | achieve by running a program.
　（システムの動作）
　次に、上記の機能構成を有するマクロ基地局１～３及びピコ基地局１０を含む移動通信システムの全体の動作例を、図５のシーケンス図の手順に沿って説明する。なお、図５に示し、以下で説明する処理の順番は、説明の便宜上のものであり、この順番に限定されるわけではない。また、以下では、測定結果の送信元のユーザ装置を１つ（ユーザ装置２０）としているが、これも説明の便宜上のものであり、測定結果の送信元のユーザ装置は１つに限られない。 (System operation)
Next, an overall operation example of the mobile communication system including the macro base stations 1 to 3 and the pico base station 10 having the above functional configuration will be described along the procedure of the sequence diagram of FIG. Note that the order of processing shown in FIG. 5 and described below is for convenience of explanation, and is not limited to this order. In the following description, one user device (user device 20) is the transmission source of the measurement result, but this is also for convenience of explanation, and the number of user devices that are the transmission source of the measurement result is not limited to one. .
　ピコ基地局１０の測定結果受信部１０２は、ユーザ装置２０から、周辺マクロ基地局からの受信信号の測定結果(measurement report)を受信する（ステップ１）。測定結果は、１つの周辺マクロ基地局を対象とする測定結果を、周辺マクロ基地局毎に、複数回受信することとしてもよいし、１つの測定結果の中に、複数の周辺マクロ基地局分の測定結果が含まれることとしてもよい。 The measurement result receiving unit 102 of the pico base station 10 receives the measurement result (measurement report) of the received signal from the neighboring macro base station from the user device 20 (step 1). As the measurement result, the measurement result for one neighboring macro base station may be received a plurality of times for each neighboring macro base station, and a plurality of neighboring macro base stations are included in one measurement result. The measurement result may be included.
　続いて、ピコ基地局１０のマクロ干渉基地局決定部１０４が、ユーザ装置２０から受信した測定結果から、ユーザ装置２０に強い干渉を及ぼしているマクロ基地局（マクロ干渉基地局）を決定する（ステップ２）。前述したように、例えば、マクロ干渉基地局決定部１０４は、受信レベルが所定値よりも高い周辺マクロ基地局をマクロ干渉基地局として決定する。本例では、PCI＃１、＃２、＃３を識別情報として持つマクロ基地局１、２、３がマクロ干渉基地局として決定されたものとする。ピコ基地局１０において、マクロ基地局１、２、３の識別情報であるPCI＃１、＃２、＃３は、マクロ干渉基地局決定部１０４からマクロ干渉基地局情報送信部１０５に渡される。 Subsequently, the macro interference base station determination unit 104 of the pico base station 10 determines a macro base station (macro interference base station) that exerts strong interference on the user apparatus 20 from the measurement result received from the user apparatus 20 ( Step 2). As described above, for example, the macro interference base station determination unit 104 determines a neighboring macro base station whose reception level is higher than a predetermined value as a macro interference base station. In this example, it is assumed that macro base stations 1, 2, and 3 having PCI # 1, # 2, and # 3 as identification information are determined as macro interference base stations. In the pico base station 10, PCI # 1, # 2, and # 3 that are identification information of the macro base stations 1, 2, and 3 are passed from the macro interference base station determination unit 104 to the macro interference base station information transmission unit 105.
　マクロ干渉基地局の識別情報としてのPCI＃１、＃２、＃３を受け取ったマクロ干渉基地局情報送信部１０５は、PCI＃１、＃２、＃３を含むマクロ干渉基地局情報を、例えば、基地局間シグナリング信号（Load Information)でマクロ基地局１に送信する（ステップ３）。なお、送信先は、PCI＃１、＃２、＃３で識別されるマクロ基地局１、２、３のうちのどのマクロ基地局でもよいが、本実施形態では、一例として、マクロ基地局１（例えば、距離が最も近いマクロ基地局、ピコ基地局が使用しているABSパターンの送信元のマクロ基地局等）に送信することとしている。 The macro interference base station information transmitting unit 105 that has received PCI # 1, # 2, and # 3 as identification information of the macro interference base station receives macro interference base station information including PCI # 1, # 2, and # 3, for example, The base station signaling signal (Load 基地 Information) is transmitted to the macro base station 1 (step 3). The transmission destination may be any one of the macro base stations 1, 2, and 3 identified by PCI # 1, # 2, and # 3. However, in this embodiment, as an example, the macro base station 1 (For example, the macro base station with the shortest distance, the macro base station that is the transmission source of the ABS pattern used by the pico base station, and the like).
　このようなマクロ干渉基地局情報の通知を行う場合を含む、基地局間シグナリング信号(X2AP signaling)のLoad Information messageの情報要素例を図６Ａに示す。図６Ａに示す情報要素のうちの最後の2行に規定された"Interference Cell Information"及び"PCI"の部分が、マクロ干渉基地局情報の通知に関する情報要素である。 FIG. 6A shows an example of an information element of Load Information message of inter-base station signaling signal (X2AP signaling) including the case of notifying such macro interference base station information. “Interference Cell Information” and “PCI” defined in the last two lines of the information elements shown in FIG. 6A are information elements related to notification of macro interference base station information.
　また、マクロ干渉基地局情報の通知を行う場合におけるInvoke Indication IEを図６Ｂに示す。この中の"Interference Cell Information"がマクロ干渉基地局情報通知に関するものである。 Also, FIG. 6B shows Invoke に お け る Indication 場合 IE in the case of reporting macro interference base station information. Among them, “Interference Cell Information” relates to macro interference base station information notification.
　図５のステップ３で、マクロ基地局１におけるマクロ干渉基地局情報受信部１５がマクロ干渉基地局情報を受信する。マクロ基地局１において、マクロ干渉基地局情報受信部１５により受信したマクロ干渉基地局情報は、ABSパターン送信部１３に渡される。 In step 3 of FIG. 5, the macro interference base station information receiving unit 15 in the macro base station 1 receives the macro interference base station information. In the macro base station 1, the macro interference base station information received by the macro interference base station information reception unit 15 is passed to the ABS pattern transmission unit 13.
　続いて、ABSパターン送信部１３は、マクロ干渉基地局情報受信部１５から受け取ったマクロ干渉基地局情報に基づき、共通に設定すべきABSパターンを送信する送信先のマクロ基地局を決定する（ステップ４）。本実施の形態では、マクロ干渉基地局情報は、PCI＃１、＃２、＃３であるから、ABSパターン送信部１３は、PCI＃２、＃３で識別されるマクロ基地局２、３に共通に設定すべきABSパターンを送信すると決定する。 Subsequently, based on the macro interference base station information received from the macro interference base station information receiving unit 15, the ABS pattern transmission unit 13 determines a destination macro base station that transmits an ABS pattern to be set in common (step). 4). In the present embodiment, since the macro interference base station information is PCI # 1, # 2, # 3, the ABS pattern transmission unit 13 determines the macro base stations 2, 3 identified by PCI # 2, # 3. It is determined that the ABS pattern that should be set in common is transmitted.
　ここでは、共通に設定すべきABSパターンとして、マクロ基地局１が使用しているABSパターンを用いることとするが、共通に設定すべきABSパターンはこれに限られるわけではない。 Here, the ABS pattern used by the macro base station 1 is used as the ABS pattern to be set in common, but the ABS pattern to be set in common is not limited to this.
　共通に設定すべきABSパターンを送信する送信先のマクロ基地局を決定したABSパターン送信部１３は、ABSパターン格納部１２から、共通に設定すべきABSパターン（マクロ基地局１で使用しているABSパターン）を読み出し、当該ABSパターンをマクロ基地局２、３に送信する（ステップ５、６）。ここでのABSパターンの送信には、例えば、基地局間シグナリング信号（Load Information）を用いる。 The ABS pattern transmitting unit 13 that has determined the transmission destination macro base station for transmitting the ABS pattern to be set in common uses the ABS pattern to be set in common (used by the macro base station 1 from the ABS pattern storage unit 12). (ABS pattern) is read out, and the ABS pattern is transmitted to the macro base stations 2 and 3 (steps 5 and 6). For transmission of the ABS pattern here, for example, an inter-base station signaling signal (Load Information) is used.
　共通に設定すべきABSパターンを受信した各マクロ基地局では、当該ABSパターンを、使用するABSパターンとして設定するとともに、配下のピコ基地局に当該ABSパターンを例えばLoad Informationで通知する。 Each macro base station that has received the ABS pattern to be set in common sets the ABS pattern as the ABS pattern to be used, and notifies the subordinate pico base station of the ABS pattern with, for example, Load IV Information.
　（実施の形態の効果について）
　上記の処理により、ピコ基地局１０に接続するユーザ装置に強い干渉を及ぼすマクロ基地局１～３を特定することができるとともに、特定したマクロ基地局１～３間のみで共通のABSパターンを設定することができる。これにより、ピコ基地局１０が、接続するユーザ装置に対して上記ABSパターンを考慮したスケジューリングを行うことで、ピコ基地局１０に接続するユーザ装置は、マクロ基地局１～３からの干渉を回避した通信を行うことが可能となる。 (Effects of the embodiment)
Through the above processing, the macro base stations 1 to 3 that exert strong interference on the user equipment connected to the pico base station 10 can be identified, and a common ABS pattern can be set only between the identified macro base stations 1 to 3 can do. Thereby, the pico base station 10 performs scheduling in consideration of the ABS pattern for the user apparatus to be connected, so that the user apparatus connected to the pico base station 10 avoids interference from the macro base stations 1 to 3. Communication can be performed.
　本発明は、上記の実施の形態に限定されることなく、特許請求の範囲内において、種々変更・応用が可能である。 The present invention is not limited to the above-described embodiment, and various modifications and applications are possible within the scope of the claims.
　本国際出願は２０１０年１２月１５日に出願した日本国特許出願２０１０－２７９３８５号に基づく優先権を主張するものであり、日本国特許出願２０１０－２７９３８５号の全内容を本国際出願に援用する。 This international application claims priority based on Japanese Patent Application No. 2010-279385 filed on Dec. 15, 2010, and the entire contents of Japanese Patent Application No. 2010-279385 are incorporated herein by reference. .
１～３　マクロ基地局
１０　ピコ基地局
２０　ユーザ装置
１１　ABSパターン設定部
１２　ABSパターン格納部
１３　ABSパターン送信部
１４　ABSパターン受信部
１５　マクロ干渉基地局情報受信部
１０１　測定指示部
１０２　測定結果受信部
１０３　スケジューリング部
１０４　マクロ干渉基地局決定部
１０５　マクロ干渉基地局情報送信部
１０６　ABSパターン受信部
１０７　ABSパターン格納部 1 to 3 Macro base station 10 Pico base station 20 User equipment 11 ABS pattern setting unit 12 ABS pattern storage unit 13 ABS pattern transmission unit 14 ABS pattern reception unit 15 Macro interference base station information reception unit 101 Measurement instruction unit 102 Measurement result reception unit 103 Scheduling unit 104 Macro interference base station determination unit 105 Macro interference base station information transmission unit 106 ABS pattern reception unit 107 ABS pattern storage unit

Claims (6)

  1. 　第１の基地局と第２の基地局を備え、当該第１の基地局で保護サブフレーム群が設定され、保護サブフレーム群を示すパターン情報が、前記第１の基地局から前記第２の基地局に通知される移動通信システムにおいて、前記第２の基地局として使用される基地局であって、
    　前記基地局に接続されるユーザ装置から、複数の第１の基地局を測定対象とした受信信号の測定結果を受信する測定結果受信手段と、
    　前記測定結果受信手段により受信した測定結果に基づき、前記ユーザ装置に干渉を及ぼす複数の第１の基地局を決定する干渉基地局決定手段と、
    　前記干渉基地局決定手段により決定された複数の第１の基地局を識別する識別情報を、所定の第１の基地局に送信する干渉基地局情報送信手段と
    　を備えることを特徴とする基地局。     A first base station and a second base station, a protection subframe group is set in the first base station, and pattern information indicating the protection subframe group is transmitted from the first base station to the second base station; In a mobile communication system notified to a base station, a base station used as the second base station,
    A measurement result receiving means for receiving a measurement result of a received signal having a plurality of first base stations as measurement targets, from a user apparatus connected to the base station;
    Interference base station determining means for determining a plurality of first base stations that interfere with the user apparatus based on the measurement result received by the measurement result receiving means;
    Interference base station information transmitting means for transmitting identification information for identifying a plurality of first base stations determined by the interference base station determining means to a predetermined first base station. .
  2. 　前記干渉基地局情報送信手段により前記所定の第１の基地局に送信される識別情報は、前記所定の第１の基地局において、前記干渉基地局決定手段により決定された複数の第１の基地局間で、共通の保護サブフレーム群パターン情報を設定するために使用される識別情報である
    　ことを特徴とする請求項１に記載の基地局。     The identification information transmitted to the predetermined first base station by the interference base station information transmission means is a plurality of first bases determined by the interference base station determination means in the predetermined first base station. The base station according to claim 1, wherein the base station is identification information used for setting common protection subframe group pattern information between stations.
  3. 　前記第１の基地局は、マクロセルを形成するマクロ基地局であり、前記第２の基地局は、マクロセルにオーバーレイするピコセルを形成するピコ基地局である
    　ことを特徴とする請求項１又は２に記載の基地局。     The first base station is a macro base station that forms a macro cell, and the second base station is a pico base station that forms a pico cell that overlays the macro cell. The listed base station.
  4. 　第１の基地局と第２の基地局を備え、当該第１の基地局で保護サブフレーム群が設定され、保護サブフレーム群を示すパターン情報が、前記第１の基地局から前記第２の基地局に通知される移動通信システムにおいて、前記第２の基地局として使用される基地局における干渉基地局情報送信方法であって、
    　前記基地局に接続されるユーザ装置から、複数の第１の基地局を測定対象とした受信信号の測定結果を受信する測定結果受信ステップと、
    　前記測定結果受信ステップにより受信した測定結果に基づき、前記ユーザ装置に干渉を及ぼす複数の第１の基地局を決定する干渉基地局決定ステップと、
    　前記干渉基地局決定ステップにより決定された複数の第１の基地局を識別する識別情報を、所定の第１の基地局に送信する干渉基地局情報送信ステップと
    　を備えることを特徴とする干渉基地局情報送信方法。     A first base station and a second base station, a protection subframe group is set in the first base station, and pattern information indicating the protection subframe group is transmitted from the first base station to the second base station; In a mobile communication system notified to a base station, an interference base station information transmission method in a base station used as the second base station,
    A measurement result receiving step for receiving a measurement result of a received signal with a plurality of first base stations as measurement targets from a user apparatus connected to the base station;
    An interference base station determination step for determining a plurality of first base stations that interfere with the user apparatus based on the measurement result received by the measurement result reception step;
    An interference base station information transmission step of transmitting identification information for identifying a plurality of first base stations determined in the interference base station determination step to a predetermined first base station. Station information transmission method.
  5. 　前記干渉基地局情報送信ステップにより前記所定の第１の基地局に送信される識別情報は、前記所定の第１の基地局において、前記干渉基地局決定ステップにより決定された複数の第１の基地局間で、共通の保護サブフレーム群パターン情報を設定するために使用される識別情報である
    　ことを特徴とする請求項４に記載の干渉基地局情報送信方法。     The identification information transmitted to the predetermined first base station in the interference base station information transmission step is a plurality of first bases determined in the interference base station determination step in the predetermined first base station. 5. The interference base station information transmission method according to claim 4, wherein the information is identification information used for setting common protection subframe group pattern information between stations.
  6. 　前記第１の基地局は、マクロセルを形成するマクロ基地局であり、前記第２の基地局は、マクロセルにオーバーレイするピコセルを形成するピコ基地局である
    　ことを特徴とする請求項４又は５に記載の干渉基地局情報送信方法。     The first base station is a macro base station that forms a macro cell, and the second base station is a pico base station that forms a pico cell that overlays the macro cell. The interference base station information transmission method described.
PCT/JP2011/078355 2010-12-15 2011-12-07 Base station and interfering base station information transmission method WO2012081480A1 (en)

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