JP6721587B2 - 端末及び無線通信方法 - Google Patents
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Description
<第1の実施形態:複数のTBを複数のDCIでスケジューリング>
本発明の第1の実施形態では、eNBは、同一TTIに割り当てる複数のTBを、それぞれ異なるTBに対応する情報(スケジューリング情報)を含む複数のL1/L2制御信号(例えば、DCI(Downlink Control Information)と呼ばれる)でスケジューリングする。当該複数のDCIは、異なるDCIフォーマットで構成されてもよいし、同じDCIフォーマットで構成されてもよい。また、当該複数のDCIは、例えばULグラント(uplink grant)、DLアサインメント(downlink assignment)などと呼ばれてもよい。
本発明の第2の実施形態では、eNBは、同一TTIに割り当てる複数のTBを、それぞれ異なるTBに対応する複数の情報を含む1つのDCIでスケジューリングする。つまり、当該DCIには、それぞれのTBのスケジューリング情報が含まれる。
本発明者らは、上述の第1及び第2の実施形態で示したように、複数のTBに対してそれぞれ異なるLAが行われている場合には、同じTTIに対するスケジューリングであっても、別々のHARQ制御を行うことが望ましいことを見出した。下りHARQの制御について第3の実施形態で説明し、上りHARQの制御については後述の第4の実施形態で説明する。
第4の実施形態は、上りHARQの制御に関する。具体的には、第4の実施形態においては、eNBは、UEから各TBで送信された上りデータについて、PHICH(Physical Hybrid-ARQ Indicator Channel)やPDCCH(Physical Downlink Control Channel)/EPDCCH(Enhanced PDCCH)でそれぞれのTBの再送/新規データ送信を指示する。
第5の実施形態は、上りTPCの制御に関する。具体的には、第5の実施形態においては、eNBは、UEが各TBで送信するPUSCHについて、それぞれのTBのTPCコマンドを通知し、UEは各TBの送信電力制御を、対応するTPCコマンドを用いて実施する。
なお、上述の各実施形態では、所定の期間として1TTI(1サブフレーム)で複数のTBを送受信する構成を示したが、本発明の適用はこれに限られない。例えば、無線通信システムにおいて、既存のLTEシステムにおける1TTIより短い期間(短縮TTI)をTTIとして用いたり、1TTIより長い期間(スーパーサブフレーム)をTTIとして用いる場合であっても、本発明を適用して、既存のTTI(サブフレーム)より短い/長い期間で複数のTBを送受信してもよい。
以下、本発明の一実施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(変形例含む)に係る無線通信方法が適用される。なお、上記各実施形態に係る無線通信方法は、それぞれ単独で適用されてもよいし、組み合わせて適用されてもよい。
図11は、本発明の一実施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13は、本発明の一実施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。
Claims (2)
- Physical Uplink Shared Channel(PUSCH)又はPhysical Downlink Shared Channel(PDSCH)をスケジューリングするための第1の下り制御情報(Downlink Control Information(DCI))及び第2のDCIを受信する受信部と、
前記第1のDCIによって示される第1のTransmission Time Interval(TTI)におけるPUSCH又はPDSCHが、前記第2のDCIによって示される前記第1のTTIより短い第2のTTIにおけるPUSCH又はPDSCHとオーバーラップする場合、前記第2のTTIにおけるPUSCHの送信又はPDSCHの受信を行い、前記第1のTTIにおけるPUSCHの送信又はPDSCHの受信を停止する制御を行う制御部と、を有することを特徴とする端末。 - Physical Uplink Shared Channel(PUSCH)又はPhysical Downlink Shared Channel(PDSCH)をスケジューリングするための第1の下り制御情報(Downlink Control Information(DCI))及び第2のDCIを受信するステップと、
前記第1のDCIによって示される第1のTransmission Time Interval(TTI)におけるPUSCH又はPDSCHが、前記第2のDCIによって示される前記第1のTTIより短い第2のTTIにおけるPUSCH又はPDSCHとオーバーラップする場合、前記第2のTTIにおけるPUSCHの送信又はPDSCHの受信を行い、前記第1のTTIにおけるPUSCHの送信又はPDSCHの受信を停止する制御を行うステップと、を有することを特徴とする端末の無線通信方法。
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