JP2014168172A - Femtocell base station - Google Patents

Femtocell base station Download PDF

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JP2014168172A
JP2014168172A JP2013039554A JP2013039554A JP2014168172A JP 2014168172 A JP2014168172 A JP 2014168172A JP 2013039554 A JP2013039554 A JP 2013039554A JP 2013039554 A JP2013039554 A JP 2013039554A JP 2014168172 A JP2014168172 A JP 2014168172A
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base station
femtocell base
radio wave
leakage
communication radio
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JP5723401B2 (en
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Noriaki Yamada
紀章 山田
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SoftBank Corp
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SoftBank Mobile Corp
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Abstract

PROBLEM TO BE SOLVED: To reduce leakage of communication radio waves from a femtocell base station installed indoor to the outdoors.SOLUTION: A femtocell base station performs alarm processing to prompt a user to attach a radio wave shield member to the body of the femtocell base station (step 402) if the leakage of communication radio waves from the indoor area where the body of the femtocell base station is installed to the outdoors exceeds a threshold value (step 401: YES). The user attaches the radio wave shield member to the body of the femtocell base station so that the leakage of the communication radio waves from the indoor area to the outdoors will be lower than the threshold value (step 403).

Description

本発明は屋内から屋外への通信電波の漏洩を低減するための機構を備えるフェムトセル基地局に関する。   The present invention relates to a femtocell base station including a mechanism for reducing leakage of communication radio waves indoors to outdoors.

近年の移動体通信システムでは、半径数百ｍ〜数ｋｍ程度のエリアをカバーするマクロセル基地局の他に、通常の基地局のセルサイズよりも狭い一般的に半径数ｍ〜数十ｍ程度のエリアをカバーする小型のフェムトセル基地局が運用されている。フェムトセル基地局は、ビル内や住宅内、地下街等のマクロセル基地局の電波が届き難い場所に設置されている。また、マクロセル基地局の電波が届く場所であっても、通信品質や通信速度の向上などの目的でフェムトセル基地局が設置されることもある。フェムトセル基地局は、複雑に混み入った環境であっても、容易に設置することができ、安定した電波環境を移動機に提供することができる。   In recent mobile communication systems, in addition to a macro cell base station that covers an area with a radius of several hundred m to several km, the radius is generally several m to several tens m, which is narrower than the cell size of a normal base station. A small femtocell base station covering the area is in operation. The femtocell base station is installed in a place where radio waves of the macrocell base station are difficult to reach, such as in a building, a house, or an underground mall. Further, even in a place where radio waves of the macro cell base station reach, a femto cell base station may be installed for the purpose of improving communication quality and communication speed. The femtocell base station can be easily installed even in a complex crowded environment, and can provide a mobile device with a stable radio wave environment.

しかし、フェムトセル基地局の設置場所によっては、フェムトセル基地局からの電波が屋内から屋外に漏れ出ることがある。例えば、屋外の電波漏洩付近を移動する移動機は、電波漏洩付近に接近する程、漏洩電波の受信強度が強くなるため、フェムトセル基地局の電波が形成するセルへのハンドオーバーや位置登録を試みようとするが、ハンドオーバーや位置登録の処理が完了しないまま、電波漏洩付近から離れてしまい、結局、ハンドオーバーや位置登録に失敗することがある。このようなハンドオーバーや位置登録の失敗は、移動機の通話障害をもたらす原因となるため好ましくない。   However, depending on the installation location of the femtocell base station, radio waves from the femtocell base station may leak from indoors to the outdoors. For example, a mobile device that moves near an outdoor radio wave leak has stronger reception strength of the leaked radio wave as it gets closer to the radio wave leak, so hand-over or location registration to the cell formed by the radio wave of the femtocell base station Although an attempt is made, the handover or location registration process is not completed and the user leaves the vicinity of the radio wave leakage, and eventually the handover or location registration may fail. Such a failure in handover or location registration is not preferable because it causes a call failure of the mobile device.

そこで、本発明は、屋内に設置されたフェムトセル基地局からの通信電波の屋外への漏れを低減することを課題とする。   Therefore, an object of the present invention is to reduce leakage of communication radio waves from a femtocell base station installed indoors to the outdoors.

上記の課題を解決するため、本発明に係わるフェムトセル基地局は、通信電波を送信するフェムトセル基地局本体と、フェムトセル基地局本体が設置されている屋内から屋外への通信電波の漏れを推定する推定手段と、フェムトセル基地局本体に着脱可能に構成され、且つ通信電波の屋内から屋外への漏れを低減するための一つ以上の電波遮蔽部材と、を備える。屋内から屋外への通信電波の漏れの推定結果に基づいて電波遮蔽部材をフェムトセル基地局本体に装着することにより、屋内から屋外への通信電波の漏れを低減することができる。   In order to solve the above-described problems, a femtocell base station according to the present invention includes a femtocell base station main body that transmits communication radio waves, and leakage of communication radio waves from indoors to outdoors where the femtocell base station main body is installed. An estimation means for estimating, and one or more radio wave shielding members configured to be detachable from the femtocell base station main body and for reducing leakage of communication radio waves from the indoor to the outdoor. By mounting the radio wave shielding member on the femtocell base station main body based on the estimation result of the leakage of communication radio waves from indoor to outdoor, leakage of communication radio waves from indoor to outdoor can be reduced.

推定手段は、通信電波が形成するセルへの屋外の移動機によるハンドオーバーの失敗数又は位置登録の失敗数を基に通信電波の屋内から屋外への漏れを推定してもよい。屋外への漏れ電波の強度が強い程、屋外における移動機のハンドオーバーの失敗数又は位置登録の失敗数が多くなる傾向があるため、これらの失敗数は、漏れ電波の度合いを推定する目安になる。   The estimation means may estimate the leakage of the communication radio wave from the indoor to the outdoor based on the number of failure of handover by the mobile station outdoor to the cell formed by the communication radio wave or the number of failure of location registration. As the strength of leaked radio waves outdoors increases, the number of failed mobile station handovers or location registration failures tends to increase, so the number of failures is a guideline for estimating the level of leaked radio waves. Become.

フェムトセル基地局は、通信電波の漏れが閾値を超えたことを契機として電波遮蔽部材のフェムトセル基地局本体への装着を促す警報処理を行う手段を更に備えてもよい。これにより、ユーザは、屋外への漏れ電波が低減するように電波遮蔽部材をフェムトセル基地局本体に装着することができる。   The femtocell base station may further include means for performing an alarm process that prompts the user to attach the radio wave shielding member to the femtocell base station body when the leakage of communication radio waves exceeds a threshold value. Thus, the user can attach the radio wave shielding member to the femtocell base station main body so as to reduce leaked radio waves to the outdoors.

フェムトセル基地局本体は、通信電波の伝播方向のうち少なくとも異なる２方向のそれぞれに垂直な装着面に電波遮蔽部材が着脱可能に構成されている。フェムトセル基地局本体の配置場所と屋内環境によって、電波の漏れる方向が異なるため、少なくとも異なる２方向に伝播する通信電波の漏れを低減できるように、電波遮蔽部材用の複数の装着面を設けるのが好ましい。   The femtocell base station main body is configured such that a radio wave shielding member is detachably attached to a mounting surface perpendicular to at least two different directions of the propagation direction of communication radio waves. Since the direction of radio wave leakage differs depending on the location of the femtocell base station body and the indoor environment, a plurality of mounting surfaces for radio wave shielding members are provided so that the leakage of communication radio waves propagating in at least two different directions can be reduced. Is preferred.

本発明によれば、屋内に設置されたフェムトセル基地局からの通信電波の屋外への漏れを低減することができる。   ADVANTAGE OF THE INVENTION According to this invention, the leakage to the outdoors of the communication electromagnetic wave from the femtocell base station installed indoors can be reduced.

本実施形態に係わるフェムトセル基地局を備える移動通信システムの全体構成図である。It is a whole block diagram of a mobile communication system provided with the femtocell base station concerning this embodiment. 本実施形態に係わるフェムトセル基地局本体の機能を示すブロック図である。It is a block diagram which shows the function of the femtocell base station main body concerning this embodiment. 本実施形態に係わるフェムトセル基地局の電波遮蔽機構を示す斜視図である。It is a perspective view which shows the electromagnetic wave shielding mechanism of the femtocell base station concerning this embodiment. 実施形態に係わる電波遮蔽処理の流れを示すフローチャートである。It is a flowchart which shows the flow of the electromagnetic wave shielding process concerning embodiment.

以下、各図を参照しながら本発明の実施形態について説明する。
図１は本実施形態に係わるフェムトセル基地局１０を備える移動通信システムの全体構成図である。フェムトセル基地局１０は、屋内３１に設置され、屋内３１の移動機２１にワイヤレスアクセスポイントを提供する。屋内３１は、オフィスビル、店舗、又は家屋等の建物内部であり、屋外基地局からの電波が届き難い電波不感エリアである。フェムトセル基地局１０の通信電波が届くセル（カバレッジエリア）７０は、屋外３２に漏れ出ないようにしつつ、屋内３１全体に行き渡るのが好ましい。フェムトセル基地局１０は、通信電波が屋外３２へ漏れ出ないようにするための電波遮蔽機構（詳細については後述する）を備えている。フェムトセル基地局１０は、光ファイバ又はメタルケーブル等の有線回線４１を介してＩＰネットワーク４０に接続している。ＩＰネットワーク４０は、ゲートウェイ５０を介して移動通信事業者のコアネットワーク６０に接続している。コアネットワーク６０には、移動機２０の呼制御等を行うための移動交換局、ホームロケーションレジスタ、ビジタロケーションレジスタ等が配置される。なお、符号２２は、屋外３２に所在する移動機を示している。 Embodiments of the present invention will be described below with reference to the drawings.
FIG. 1 is an overall configuration diagram of a mobile communication system including a femtocell base station 10 according to the present embodiment. The femtocell base station 10 is installed in the indoor 31 and provides a wireless access point to the mobile device 21 in the indoor 31. The indoor 31 is inside a building such as an office building, a store, or a house, and is a radio wave insensitive area where radio waves from an outdoor base station are difficult to reach. It is preferable that the cell (coverage area) 70 through which the communication radio wave of the femtocell base station 10 reaches is spread throughout the indoor 31 while preventing leakage to the outdoor 32. The femtocell base station 10 includes a radio wave shielding mechanism (details will be described later) for preventing communication radio waves from leaking to the outdoors 32. The femtocell base station 10 is connected to the IP network 40 via a wired line 41 such as an optical fiber or a metal cable. The IP network 40 is connected to the core network 60 of the mobile communication carrier via the gateway 50. In the core network 60, a mobile switching center, a home location register, a visitor location register, and the like for performing call control of the mobile device 20 are arranged. Reference numeral 22 indicates a mobile device located outdoors 32.

図２は本実施形態に係わるフェムトセル基地局本体１１の機能を示すブロック図である。フェムトセル基地局本体１１は、移動機２１との間で電波を送受信するためのアンテナ１２、無線信号の周波数変換及び変復調処理等を行うＲＦ処理部１３、移動機２１の通信プロトコルとＩＰネットワーク４０の通信プロトコルとの間でプロトコル変換を行うプロトコル変換部１４、フェムトセル基地局１０の動作を制御するプロセッサ及び記憶資源等のハードウェア資源から構成される制御部１５、発光ダイオード１６、及びＩＰネットワーク４０に接続する通信インタフェース１７を備える。アンテナ１２は、無指向性アンテナでもよく、或いは指向性アンテナでもよい。発光ダイオード１６の役割については、後述する。   FIG. 2 is a block diagram illustrating functions of the femtocell base station main body 11 according to the present embodiment. The femtocell base station main body 11 includes an antenna 12 for transmitting and receiving radio waves to and from the mobile device 21, an RF processing unit 13 that performs frequency conversion and modulation / demodulation processing of a radio signal, a communication protocol of the mobile device 21, and an IP network 40. A protocol conversion unit 14 that performs protocol conversion with the communication protocol of the other, a control unit 15 that includes hardware resources such as a processor and storage resources that control the operation of the femtocell base station 10, a light emitting diode 16, and an IP network 40 is provided with a communication interface 17 connected to 40. The antenna 12 may be an omnidirectional antenna or a directional antenna. The role of the light emitting diode 16 will be described later.

図３は本実施形態に係わるフェムトセル基地局１０の電波遮蔽機構を示す斜視図である。フェムトセル基地局１０は、フェムトセル基地局本体１１と、フェムトセル基地局本体１１の二つの装着面１１Ａ，１１Ｂにそれぞれ着脱可能に構成された二つの電波遮蔽部材１８，１９とを備えている。電波遮蔽部材１８，１９は、電波を吸収する材質（例えば、ガラスクロス補強アルミ箔）から構成されている。同図に示す例では、二つの装着面１１Ａ，１１Ｂは互いに表裏の関係にあるため、二つの電波遮蔽部材１８，１９は、それぞれ真逆の方向に伝播する通信電波の屋内３１から屋外３２への漏れを低減する。同図では、説明の便宜上、二つの電波遮蔽部材１８，１９を例示しているが、電波遮蔽部材の数は二つに限られるものではなく、一つ又は三つ以上でもよい。フェムトセル基地局本体１１は、通信電波の伝播方向のうち少なくとも異なる２方向（例えば、直角方向）のそれぞれに垂直な装着面に電波遮蔽部材が着脱可能に構成されてもよい。或いはフェムトセル基地局本体１１の一つの装着面に複数の電波遮蔽部材を重ねて着脱可能に構成してもよい。電波遮蔽部材が装着されるフェムトセル基地局本体１１の装着面の数は、一つ又は三つ以上でもよい。   FIG. 3 is a perspective view showing a radio wave shielding mechanism of the femtocell base station 10 according to the present embodiment. The femtocell base station 10 includes a femtocell base station main body 11 and two radio wave shielding members 18 and 19 configured to be detachable from the two mounting surfaces 11A and 11B of the femtocell base station main body 11, respectively. . The radio wave shielding members 18 and 19 are made of a material that absorbs radio waves (for example, glass cloth reinforced aluminum foil). In the example shown in the figure, since the two mounting surfaces 11A and 11B are in a front-to-back relationship, the two radio wave shielding members 18 and 19 are respectively transmitted from the indoor 31 to the outdoor 32 of communication radio waves propagating in opposite directions. Reduce leakage. In the figure, for convenience of explanation, two radio wave shielding members 18 and 19 are illustrated, but the number of radio wave shielding members is not limited to two, and may be one or three or more. The femtocell base station main body 11 may be configured such that a radio wave shielding member can be attached to and detached from a mounting surface perpendicular to at least two different directions (for example, perpendicular directions) of the propagation directions of communication radio waves. Alternatively, a plurality of radio wave shielding members may be stacked on one mounting surface of the femtocell base station main body 11 so as to be detachable. The number of mounting surfaces of the femtocell base station body 11 on which the radio wave shielding member is mounted may be one or three or more.

図４は本実施形態に係わる電波遮蔽処理の流れを示すフローチャートである。
ステップ４０１では、制御部１５は、フェムトセル基地局本体１１が設置されている屋内３１から屋外３２への通信電波の漏れが閾値を超えているか否かを判定する。屋内３１から屋外３２への通信電波の漏れが強い程、屋外３２の移動機２２によるセル７０へのハンドオーバーの失敗数又は位置登録の失敗数が増大する傾向があるため、制御部１５は、移動機２２によるセル７０へのハンドオーバーの失敗数又は位置登録の失敗数に基づいて、屋内３１から屋外３２への通信電波の漏れの度合いを推定することができる。通信電波の漏れが閾値を超えるか否かは、例えば、移動機２２によるセル７０へのハンドオーバーの失敗数又は位置登録の失敗数の何れか一方又は両者がある閾値を超えるか否かによって判定してもよい。 FIG. 4 is a flowchart showing the flow of radio wave shielding processing according to this embodiment.
In step 401, the control unit 15 determines whether or not the leakage of communication radio waves from the indoor 31 where the femtocell base station body 11 is installed to the outdoor 32 exceeds a threshold value. As the communication radio wave leakage from the indoor 31 to the outdoor 32 is stronger, the number of failed handovers or the number of failed location registrations by the mobile devices 22 of the outdoor 32 tends to increase. The degree of leakage of communication radio waves from the indoor 31 to the outdoor 32 can be estimated based on the number of failed handovers to the cell 70 by the mobile device 22 or the number of failed location registrations. Whether the leakage of communication radio waves exceeds a threshold value is determined, for example, by determining whether one or both of the number of failures of handover to the cell 70 by the mobile device 22 and the number of location registration failures exceed a certain threshold value May be.

ステップ４０２では、制御部１５は、通信電波の漏れが閾値を超えたことを契機として、フェムトセル基地局本体１１への電波遮蔽部材の装着をユーザに促すための警報処理を行う。警報処理は、例えば、発光ダイオード１６等の表示手段を所定の色（例えば、赤色）に点灯させることにより、電波遮蔽部材の装着を視覚的に促す方法でもよく、或いは、電波遮蔽部材の装着を音声案内等で聴覚的に促す方法でもよい。   In step 402, the control unit 15 performs an alarm process for prompting the user to attach the radio wave shielding member to the femtocell base station main body 11 when the communication radio wave leakage exceeds the threshold. The alarm processing may be, for example, a method of visually urging the mounting of the radio wave shielding member by turning on display means such as the light emitting diode 16 in a predetermined color (for example, red), or mounting the radio wave shielding member. A method of audibly prompting by voice guidance or the like may be used.

ステップ４０３では、ユーザは、フェムトセル基地局本体１１に電波遮蔽部材を装着する。電波遮蔽部材をフェムトセル基地局本体１１に装着してもなお、屋内３１から屋外３２への通信電波の漏れが閾値を上回る場合には（ステップ４０１；ＹＥＳ）、警報処理が実行されるため（ステップ４０２）、ユーザは、屋内３１から屋外３２への通信電波の漏れが閾値を下回るように、電波遮蔽部材の装着位置や装着枚数を調整することができる。例えば、図３に示す例では、電波遮蔽部材１８をフェムトセル基地局本体１１の装着１１Ａに装着してもなお、屋内３１から屋外３２への通信電波の漏れが閾値を上回る場合には、電波遮蔽部材１９をフェムトセル基地局本体１１の装着面１１Ｂに装着したり、或いはフェムトセル基地局本体１１の装着面１１Ａに複数の電波遮蔽部材１８を重ねて装着したりして、屋内３１から屋外３２への通信電波の漏れが閾値を下回るようにする。   In step 403, the user attaches a radio wave shielding member to the femtocell base station main body 11. Even if the radio wave shielding member is attached to the femtocell base station main body 11, if the leakage of communication radio waves from the indoor 31 to the outdoor 32 exceeds the threshold (step 401; YES), alarm processing is executed (step 401; YES) Step 402) The user can adjust the mounting position and the number of mounted radio wave shielding members so that the leakage of communication radio waves from the indoor 31 to the outdoor 32 falls below the threshold. For example, in the example shown in FIG. 3, if the leakage of communication radio waves from the indoor 31 to the outdoor 32 exceeds the threshold even when the radio wave shielding member 18 is mounted on the mounting 11A of the femtocell base station body 11, the radio wave The shielding member 19 is mounted on the mounting surface 11B of the femtocell base station main body 11, or a plurality of radio wave shielding members 18 are mounted on the mounting surface 11A of the femtocell base station main body 11 so as to be outdoor from the indoor 31. The leakage of communication radio waves to 32 is set to be lower than the threshold value.

なお、ステップ４０１，４０２の各ステップを実行するためのプログラムは、制御部１５内のコンピュータ読み取り可能な記録媒体に格納されている。コンピュータ読み取り可能な記録媒体とは、揮発性メモリ、不揮発性メモリ、ハードディスク、光磁気ディスク等の各種記憶資源をいう。コンピュータ読み取り可能な記録媒体は、インターネット等のネットワークや電話回線等の通信回線を介してプログラムが送信された場合のサーバやクライアントとなるコンピュータシステム内部の揮発性メモリのように、プログラムを一時的に保持しているものも含むものとする。また、プログラムは、このプログラムを記憶装置等に格納したコンピュータシステムから、伝送媒体を介して、或いは伝送媒体中の伝送波により他のコンピュータシステムに伝送されてもよい。ここで、プログラムを伝送する伝送媒体は、インターネット等のネットワークや電話回線等の通信回線のように情報を伝送する機能を有する媒体のことをいう。   Note that a program for executing the steps 401 and 402 is stored in a computer-readable recording medium in the control unit 15. The computer-readable recording medium refers to various storage resources such as a volatile memory, a nonvolatile memory, a hard disk, and a magneto-optical disk. A computer-readable recording medium temporarily stores a program, such as a volatile memory inside a computer system serving as a server or client when the program is transmitted via a network such as the Internet or a communication line such as a telephone line. Including those held. The program may be transmitted from a computer system storing the program in a storage device or the like to another computer system via a transmission medium or by a transmission wave in the transmission medium. Here, the transmission medium for transmitting the program refers to a medium having a function of transmitting information, such as a network such as the Internet or a communication line such as a telephone line.

１０…フェムトセル基地局
１１…フェムトセル基地局本体
１１Ａ，１１Ｂ…装着面
１２…アンテナ
１３…ＲＦ処理部
１４…プロトコル変換部
１５…制御部
１６…発光ダイオード
１７…通信インタフェース
１８，１９…電波遮蔽部材
２１，２２…移動機
３１…屋内
３２…屋外
４０…ＩＰネットワーク
４１…有線回線
５０…ゲートウェイ
６０…コアネットワーク
７０…セル DESCRIPTION OF SYMBOLS 10 ... Femtocell base station 11 ... Femtocell base station main body 11A, 11B ... Mounting surface 12 ... Antenna 13 ... RF processing part 14 ... Protocol conversion part 15 ... Control part 16 ... Light emitting diode 17 ... Communication interface 18, 19 ... Radio wave shielding Members 21, 22 ... Mobile device 31 ... Indoor 32 ... Outdoor 40 ... IP network 41 ... Wired line 50 ... Gateway 60 ... Core network 70 ... Cell

Claims (4)

通信電波を送信するフェムトセル基地局本体と、
前記フェムトセル基地局本体が設置されている屋内から屋外への前記通信電波の漏れを推定する推定手段と、
前記フェムトセル基地局本体に着脱可能に構成され、且つ前記通信電波の屋内から屋外への漏れを低減するための一つ以上の電波遮蔽部材と、
を備えるフェムトセル基地局。 A femtocell base station that transmits communication radio waves,
Estimating means for estimating leakage of the communication radio wave from indoor to outdoor where the femtocell base station body is installed;
One or more radio wave shielding members configured to be detachable from the femtocell base station main body, and to reduce leakage of the communication radio wave from indoor to outdoor; and
A femtocell base station comprising: 請求項１に記載フェムトセル基地局であって、
前記推定手段は、前記通信電波が形成するセルへの屋外の移動機によるハンドオーバーの失敗数又は位置登録の失敗数を基に前記通信電波の屋内から屋外への漏れを推定する、フェムトセル基地局。 The femtocell base station according to claim 1,
The estimation means estimates the leakage of the communication radio wave from the indoor to the outdoor based on the number of failure of handover or the number of location registration failures by an outdoor mobile station to the cell formed by the communication radio wave. Bureau. 請求項１又は請求項２に記載フェムトセル基地局であって、
前記通信電波の漏れが閾値を超えたことを契機として、前記電波遮蔽部材の前記フェムトセル基地局本体への装着を促す警報処理を行う手段を更に備える、フェムトセル基地局。 The femtocell base station according to claim 1 or 2,
A femtocell base station further comprising means for performing an alarm process for prompting the radio wave shielding member to be attached to the femtocell base station body when the leakage of the communication radio wave exceeds a threshold value. 請求項１乃至請求項３のうち何れか１項に記載フェムトセル基地局であって、
前記フェムトセル基地局本体は、前記通信電波の伝播方向のうち少なくとも異なる２方向のそれぞれに垂直な装着面に前記電波遮蔽部材が着脱可能に構成されている、フェムトセル基地局。 A femtocell base station according to any one of claims 1 to 3,
The femtocell base station main body is configured such that the radio wave shielding member is detachably attached to a mounting surface perpendicular to at least two different directions of the propagation direction of the communication radio wave.
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