JP5618072B2 - 無線通信システム、無線通信装置、無線通信方法 - Google Patents
無線通信システム、無線通信装置、無線通信方法 Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W16/00—Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures
- H04W16/24—Cell structures
- H04W16/32—Hierarchical cell structures
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- H04—ELECTRIC COMMUNICATION TECHNIQUE
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- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
- H04W52/04—TPC
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- H04W52/08—Closed loop power control
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Description
フェムト基地局のカバレッジを制御する技術として、例えば特許文献1がある。特許文献1に記載されているフェムト基地局は、マクロ基地局に対する受信品質を測定し、所定の電力オフセットを加算することで、レファレンス信号の送信電力及び送信電力の最大値の初期値を決定する。そして、フェムト基地局との通信が許可されているフェムト移動局は、フェムト基地局に対する受信品質を測定し、定期的または所定の条件が満たされた場合、フェムト基地局に測定結果を報告する。フェムト基地局は、報告された測定結果に基づき、所定の目標値に近づくように送信電力を調整する。
上記課題を解決するための本発明の基地局は、移動局が測位した前記移動局の位置情報に基づいて前記移動局が自基地局以外の基地局である第1の基地局から所定の距離内にいるかを判断し、前記所定の距離内にいる場合、前記移動局が前記第1の基地局から送信される信号を測定して得た受信レベルに応じて前記第1の基地局の無線パラメータの変更要求を作成し、前記第1の基地局に送信する制御手段を有することを特徴とする。
まず、第1の実施の形態について説明する。第1の実施の形態では、フェムト基地局からの受信レベルを測定する構成を説明する。
フェムト基地局の通信エリアを拡大させた方が良いかの判定は、測定値と所定の閾値との比較で判定する。すなわち、測定値が第1の閾値以下、かつ第2の閾値以上のとき(第1の閾値>第2の閾値)、フェムト基地局の通信エリアを拡大させたほうがよいと判定する。閾値の具体例としては、受信信号の強さの場合は第1の閾値を−100dBm、第2の閾値を−140dB、受信信号の品質の場合は、それぞれ−10dB、−20dBが挙げられる。
また、測定された受信レベルに基づいて変更させる無線パラメータの例として、送信電力やアンテナのチルト角がある。送信電力を増大(例えば1dB)させることで、またはチルト角を水平方向に対して低減させる(例えば10度)ことで、通信エリアを拡大できる。
次に、本発明の第2の実施の形態を説明する。本実施の形態では、受信レベルに加えて移動局の位置情報を用いて判定する構成について説明する。なお、上記第1の実施の形態と同様の構成については、同一の番号を付し、詳細な説明は要略する。また、以下の説明では、移動局の位置情報によって判定する構成について説明するが、通信状況と位置情報とに基づいて判定する構成であってもよい。
上り制御信号生成部140は、測位結果と測定結果とをマクロ基地局20に送信する。
次に、本発明の第3の実施の形態について説明する。上記実施の形態では、フェムト基地局の通信エリアを拡大する構成について説明した。本実施の形態では、拡大した通信エリアを縮小、または現在の大きさに維持する構成について説明する。尚、上記実施の形態と同様の構成については、同一の番号を付し、詳細な説明は省略する。
次に、本発明の第4の実施の形態について説明する。上記実施の形態では、無線パラメータ設定部232がフェムト基地局の通信エリアを拡大させた方が良いかを判定する構成について説明した。本実施の形態では、移動局の測定部131が判定する構成について説明する。尚、上記実施の形態と同様の構成については、同一の番号を付し、詳細な説明は省略する。
20 マクロ基地局
30 フェムト基地局
110 無線通信制御部
120 下り制御信号再生部
130 制御部
140 上り制御信号生成部
210 無線通信制御部
220 上り制御信号再生部
230 制御部
240 下り制御信号生成部
250 有線通信制御部
310 無線送受信部
320 上り制御信号再生部
330 制御部
340 下り制御信号生成部
350 有線通信制御部
Claims (10)
- 第1の基地局と、第2の基地局と、前記第1及び第2の基地局のいずれにも接続できる移動局とから構成される無線通信システムであって、
前記移動局は、前記第1の基地局から送信される信号の受信レベルを測定する手段と、自移動局の位置情報を測位する手段と、前記受信レベルと前記位置情報とを前記第2の基地局に送信する手段とを有し、
前記第2の基地局は、前記移動局が前記第1の基地局から所定の距離内にいるかを判断し、所定の距離内にいる場合、前記受信レベルに応じて前記第1の基地局の無線パラメータの変更要求を作成し、前記第1の基地局に送信する制御手段を有し、
前記第1の基地局は、前記第2の基地局から受信した前記無線パラメータの変更要求に従って無線パラメータを変更する制御手段を有する
ことを特徴とする無線通信システム。 - 基地局であって、
移動局が測位した前記移動局の位置情報に基づいて前記移動局が自基地局以外の基地局である第1の基地局から所定の距離内にいるかを判断し、前記所定の距離内にいる場合、前記移動局が前記第1の基地局から送信される信号を測定して得た受信レベルに応じて前記第1の基地局の無線パラメータの変更要求を作成し、前記第1の基地局に送信する制御手段を有する
ことを特徴とする基地局。 - 前記制御手段は、前記測定の結果が第1の閾値以下、かつ第2の閾値以上のとき、前記第1の基地局の通信エリアを拡大することを特徴とする請求項2に記載の基地局。
- 前記受信レベルは、前記第1の基地局からの信号の受信の強さであることを特徴とする請求項2又は請求項3に記載の基地局。
- 前記受信レベルは、前記第1の基地局からの信号の通信品質であることを特徴とする請求項2から請求項4のいずれかに記載の基地局。
- 前記測定の結果が第3の閾値以上のとき、通信エリアを縮小させる縮小制御手段を有することを特徴とする請求項2から請求項5のいずれかに記載の基地局。
- 前記制御手段は、前記第1の基地局の送信電力を制御することにより、前記第1の基地局の通信エリアを拡大させることを特徴とする請求項2から請求項6のいずれかに記載の基地局。
- 前記制御手段は、前記第1の基地局のチルト角を制御することにより、前記第1の基地局の通信エリアを拡大させることを特徴とする請求項2から請求項6のいずれかに記載の基地局。
- 制御装置であって、
移動局が測位した前記移動局の位置情報に基づいて前記移動局が接続中の基地局以外の基地局である第1の基地局から所定の距離内にいるかを判断し、前記所定の距離内にいる場合、前記移動局が前記第1の基地局から送信される信号を測定して得た受信レベルに応じて、前記第1の基地局の通信エリアを拡大させる制御手段を有することを特徴とする制御装置。 - 基地局における無線パラメータ変更要求生成方法であって、
前記移動局が測位した前記移動局の位置情報に基づいて前記移動局が自局以外の第1の基地局から所定の距離内にいるかを判断し、前記所定の距離内にいる場合、前記移動局が前記第1の基地局から送信される信号を測定して得た受信レベルに応じて、前記第1の基地局の無線パラメータの変更要求を作成する作成ステップと、
前記作成した無線パラメータの変更要求を前記第1の基地局に送信する送信ステップと
を有することを特徴とする無線パラメータ変更要求生成方法。
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TWI492656B (zh) * | 2012-12-25 | 2015-07-11 | 廣達電腦股份有限公司 | 無線存取點 |
JP5622951B2 (ja) * | 2014-01-29 | 2014-11-12 | パナソニック株式会社 | コードレス電話システムおよび安全管理装置 |
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RU2009141914A (ru) * | 2007-04-27 | 2011-06-10 | НТТ ДоСоМо, Инк. (JP) | Мобильная станция, базовая станция и способ конфигурирования зоны связи, реализуемый заданной базовой станцией |
US20100113035A1 (en) * | 2008-11-05 | 2010-05-06 | Suat Eskicioglu | Location-based handovers from a macrocell to a femtocell using event-triggered measurement reporting |
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