JP6813662B2 - ユーザ端末及び無線通信方法 - Google Patents
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Description
図3及び4を参照し、本実施の形態に係るビーム測定について例示する。
図3〜6を参照し、本実施の形態において、ビームリカバリの要求信号(ビームリカバリ信号)を送信するトリガ条件について説明する。ビームリカバリ信号は、ビーム障害イベントが発生する場合に送信されるので、当該トリガ条件は、ビーム障害イベントの条件と呼ばれてもよい。また、ビームリカバリ信号は、ビーム障害の発生を通知する信号であってもよい。
第1のトリガ条件は、L個のCSI−RSリソースがL3−RSRP測定用に設定され、N個のCSI−RSリソースがL1−RSRP測定用に設定される場合を想定する。例えば、図4に示すように、N個のTxビームB21〜B24(アクティブビーム)に関連付けられたCSI−RSリソース#0〜#3が、L1−RSRP測定用に設定され、L個のTxビームB21〜B24(非アクティブビーム)に関連付けられたCSI−RSリソース#4〜#7が、L3−RSRP測定用に設定される場合を想定する。
第2のトリガ条件は、L個のCSI−RSリソースがL3−RSRP測定用に設定されずに、N個のCSI−RSリソースがL1−RSRP測定用に設定される場合を想定する。
なお、ビームリカバリ信号を送信するトリガ条件は、上記第1及び第2のトリガ条件に限られない。SSブロックを用いて測定されるL3−RSRP(L3−SS−RSRP)、SSブロックを用いて測定されるL1−RSRP(L1−SS−RSRP)、CSI−RSリソースを用いて測定されるL3−RSRP(L3−CSI−RSRP)、CSI−RSリソースを用いて測定されるL1−RSRP(L1−CSI−RSRP)の少なくとも一つを用いて、トリガ条件を規定することができる。
図7を参照し、以上のようなトリガ条件を用いたビームリカバリ動作について説明する。
以下、本実施の形態に係る無線通信システムの構成について説明する。この無線通信システムでは、本発明の上記各実施形態に係る無線通信方法のいずれか又はこれらの組み合わせを用いて通信が行われる。
図9は、本実施の形態に係る無線基地局の全体構成の一例を示す図である。無線基地局10は、複数の送受信アンテナ101と、アンプ部102と、送受信部103と、ベースバンド信号処理部104と、呼処理部105と、伝送路インターフェース106と、を備えている。なお、送受信アンテナ101、アンプ部102、送受信部103は、それぞれ1つ以上を含むように構成されればよい。
図11は、本実施の形態に係るユーザ端末の全体構成の一例を示す図である。ユーザ端末20は、複数の送受信アンテナ201と、アンプ部202と、送受信部203と、ベースバンド信号処理部204と、アプリケーション部205と、を備えている。なお、送受信アンテナ201、アンプ部202、送受信部203は、それぞれ1つ以上を含むように構成されればよい。
なお、上記実施形態の説明に用いたブロック図は、機能単位のブロックを示している。これらの機能ブロック(構成部)は、ハードウェア及び/又はソフトウェアの任意の組み合わせによって実現される。また、各機能ブロックの実現手段は特に限定されない。すなわち、各機能ブロックは、物理的及び/又は論理的に結合した1つの装置により実現されてもよいし、物理的及び/又は論理的に分離した2つ以上の装置を直接的及び/又は間接的に(例えば、有線及び/又は無線)で接続し、これら複数の装置により実現されてもよい。
なお、本明細書で説明した用語及び/又は本明細書の理解に必要な用語については、同一の又は類似する意味を有する用語と置き換えてもよい。例えば、チャネル及び/又はシンボルは信号(シグナリング)であってもよい。また、信号はメッセージであってもよい。参照信号は、RS(Reference Signal)と略称することもでき、適用される標準によってパイロット(Pilot)、パイロット信号などと呼ばれてもよい。また、コンポーネントキャリア(CC:Component Carrier)は、セル、周波数キャリア、キャリア周波数などと呼ばれてもよい。
Claims (6)
- ビームリカバリの要求信号を送信する送信部と、
下り制御チャネルの復調用参照信号のアンテナポートと擬似コロケーション(QCL)の関係にあるチャネル状態情報参照信号(CSI−RS)リソースを用いて測定される受信電力と、所定の閾値とに基づいて、前記要求信号の送信を制御する制御部と、
を具備することを特徴とする端末。 - 前記制御部は、候補ビームに関連付けられるCSI−RSリソースを用いて測定される受信電力に基づいて、前記要求信号の送信を制御することを特徴とする請求項1に記載の端末。
- 前記受信電力は、L1−RSRP(Layer 1 Reference Signal Received Power)であることを特徴とする請求項1又は請求項2に記載の端末。
- 前記要求信号は、物理ランダムアクセスチャネル(PRACH)プリアンブルであることを特徴とする請求項1から請求項3のいずれかに記載の端末。
- 前記制御部は、所定のサーチスペースにおいて、前記要求信号に対する応答信号用の下り制御チャネルを復号することを特徴とする請求項1から請求項4のいずれかに記載の端末。
- ビームリカバリの要求信号を送信する工程と、
下り制御チャネルの復調用参照信号のアンテナポートと擬似コロケーション(QCL)の関係にあるチャネル状態情報参照信号(CSI−RS)リソースを用いて測定される受信電力と、所定の閾値とに基づいて、前記要求信号の送信を制御する工程と、
を具備することを特徴とする無線通信方法。
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US (1) | US11888570B2 (ja) |
EP (1) | EP3605862A4 (ja) |
JP (1) | JP6813662B2 (ja) |
KR (1) | KR20190129919A (ja) |
CN (1) | CN110731055A (ja) |
BR (1) | BR112019019697A2 (ja) |
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CN110731055A (zh) | 2020-01-24 |
EP3605862A4 (en) | 2020-11-25 |
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