JP5931922B2 - 移動通信システムでランダムアクセス手続を行う方法及び装置 - Google Patents
移動通信システムでランダムアクセス手続を行う方法及び装置 Download PDFInfo
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Description
・(プリアンブル送信でない他の)逆方向送信の性格:例えば、再送信が可能であるか、ユーザデータに対する送信であるか、制御データに対する送信であるかなど
・連結状態端末がプライマリセルでランダムアクセスを遂行する主要な理由は、SRを送信するためのPUCCH送信リソースのない端末がBSRを送信するためのものという点を考慮すれば、すなわち端末がプライマリセルでランダムアクセスを遂行する可能性が希薄という点を考慮すれば、プライマリセルのプリアンブル送信と他の逆方向送信が同一の時間に行われる可能性も、希薄ということが分かる。
・上記同期獲得手続は、該当セカンダリセルが活性化する毎に要求されることもある。それだけでなく、セカンダリセルを介して逆方向送信を遂行する理由は、端末の逆方向送信速度を高めるためのものである。したがって、端末がセカンダリセルでプリアンブルを送信する時点にすでに他のサービングセルでPUSCHを送信している可能性が高い。
・端末が支援する周波数帯域の組合
・周波数帯域別のMIMO layerの数
・周波数帯域別に集約できるセルの数
・周波数帯域別の最大帯域幅
・ランダムアクセスが発生した理由がPDCCH orderによるものであれば、プリアンブル送信に優先順位を付与
・ランダムアクセスが発生した理由がBSR送信のためのものであり(あるいは、逆方向送信を再開するためのものであり)、他の逆方向送信がPUCCH送信であれば、他の逆方向送信に優先順位を付与
・ランダムアクセスが発生した理由がBSR送信のためのものであり(あるいは、逆方向送信を再開するためのものであり)、他の逆方向送信がPUSCH送信であれば、プリアンブル送信に優先順位を付与
・プリアンブルがPUCCH送信と重なるとき、PUCCH送信がHARQ ACK/NACK送信やCQI送信であれば、PUCCH送信に優先順位を付与
・プリアンブルがPUCCH送信と重なるとき、PUCCH送信がSRS送信やSR送信であれば、プリアンブル送信に優先順位を付与
・プリアンブルがPUSCH送信と重なれば、プリアンブル送信に優先順位を付与
・プリアンブルがPUCCH送信と重なるとき、プリアンブルが最初の送信であれば、PUCCH送信に優先順位を付与
・プリアンブルがPUCCH送信と重なるとき、プリアンブルが最初の送信でなく再送信であれば、プリアンブル送信に優先順位を付与(再送信されるプリアンブルを送信しないか又は送信出力を減らす場合、端末の送信出力制御に悪影響を及ぼすからである。)
・プリアンブルがPUSCH送信と重なれば、プリアンブルの最初の送信/再送信の有無と関係なく、プリアンブル送信に優先順位を付与
・SRSとプリアンブルが同一のセルで遂行されると、プリアンブル送信のみを行う。
・SRSとプリアンブルが他のセルで遂行されると、プリアンブルとSRSを同時に送信する。
125 MME
130 S−GW
135 UE
805 送受信部
810 制御部
815 多重化及び逆多重化部
820 上位階層処理部
825 上位階層処理部
830 制御メッセージ処理部
Claims (14)
- 端末のランダムアクセス方法であって、
スケジューリングリクエストSRが保留中であるかを判断する保留判断ステップと、
前記SRが保留中であれば、現在の送信周期TTIでアップリンク送信リソースが利用可能であるかを判断するステップと、
現在TTIでアップリンク送信リソースが利用可能でなければ、前記SRを送信するためのPUCCHリソースが設定されているかを判断するステップと、
前記PUCCHリソースが設定されていなければ、プライマリセルでランダムアクセス手続を開始するステップと、
を含む、ランダムアクセス方法。 - 前記PUCCHリソースが設定されていれば、現在TTIで前記SRを送信するためのPUCCHリソースが設定されており、現在TTIが測定ギャップ(measurement gap)の一部ではなく、タイマーが駆動中(running)であるか否かを判断するステップと、
現在TTIで前記SRを送信するためのPUCCHリソースが設定されており、現在TTIが測定ギャップの一部ではなく、タイマーが駆動中ではない場合、SR送信回数カウンターとあらかじめ設定されたSR送信最大値とを比較するステップと、
前記SR送信回数カウンターが前記SR送信最大値以上の場合、PUCCH及びSRS送信リソースを解除するステップと、
をさらに含む、請求項1に記載のランダムアクセス方法。 - 前記SR送信回数カウンターが前記SR送信最大値以上の場合、前記プライマリセルでランダムアクセス手続を開始するステップをさらに含む、請求項2に記載のランダムアクセス方法。
- 前記SR送信回数カウンターが前記SR送信最大値未満の場合、前記PUCCHリソースを介して前記SRをシグナリングするステップをさらに含む、請求項3に記載のランダムアクセス方法。
- 前記SR送信回数カウンターが前記SR送信最大値未満の場合、前記SR送信回数カウンターを1だけ増加させ、前記タイマーを駆動するステップをさらに含む、請求項4に記載のランダムアクセス方法。
- 前記保留判断ステップは、
トリガーされたが取り消されていないSRは、保留中であると判断するステップを含む、請求項1に記載のランダムアクセス方法。 - バッファ状態リポート(BSR;Buffer Status Report)がトリガーされると、前記SRをトリガーするステップと、
前記BSRがMAC PDU(Media Access Control Packet Data Unit)に含まれると、前記SRを取り消すステップと、
をさらに含む、請求項6に記載のランダムアクセス方法。 - ランダムアクセスを遂行する端末であって、
スケジューリングリクエストSRが保留中であるかを判断する保留判断ステップと、
前記SRが保留中であれば、現在の送信周期TTIでアップリンク送信リソースが利用可能であるかを判断するステップと、
現在TTIでアップリンク送信リソースが利用可能でなければ、前記SRを送信するためのPUCCHリソースが設定されているかを判断するステップと、
前記PUCCHリソースが設定されていなければ、プライマリセルでランダムアクセス手続を開始するステップと、
を遂行するように設定された制御部を含む、端末。 - 前記制御部は、
前記PUCCHリソースが設定されていれば、現在TTIで前記SRを送信するためのPUCCHリソースが設定されており、現在TTIが測定ギャップの一部ではなく、タイマーが駆動中であるか否かを判断するステップと、
現在TTIで前記SRを送信するためのPUCCHリソースが設定されており、現在TTIが測定ギャップの一部ではなく、タイマーが駆動中ではない場合、SR送信回数カウンターとあらかじめ設定されたSR送信最大値とを比較するステップと、
前記SR送信回数カウンターが前記SR送信最大値以上の場合、PUCCH及びSRS送信リソースを解除するステップと、
をさらに遂行するように設定されたことを特徴とする、請求項8に記載の端末。 - 前記制御部は、前記SR送信回数カウンターが前記SR送信最大値以上の場合、前記プライマリセルでランダムアクセス手続を開始することを特徴とする、請求項9に記載の端末。
- 前記SR送信回数カウンターが前記SR送信最大値未満の場合、前記PUCCHリソースを介して前記SRをシグナリングする送受信部をさらに含む、請求項10に記載の端末。
- 前記制御部は、前記SR送信回数カウンターが前記SR送信最大値未満の場合、前記SR送信回数カウンターを1だけ増加させ、前記タイマーを駆動することを特徴とする、請求項11に記載の端末。
- 前記制御部は、トリガーされたが取り消されていないSRは、保留中であると判断することを特徴とする、請求項8に記載の端末。
- 前記制御部は、バッファ状態リポートBSRがトリガーされると前記SRをトリガーし、前記BSRがMAC PDUに含まれると前記SRを取り消すことを特徴とする請求項13に記載の端末。
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