JP6528338B2 - Lte−a通信システム、及び、送受信方法 - Google Patents
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- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
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Description
(b)一方の単位バンドが、下り1CW送信のみをサポートする送信モードで、他方の単位バンドが、下り2CW送信までをサポートする送信モード
(c)各単位バンドが、下り2CW送信までをサポートする送信モード
(1)M=1
(2)M=2
(3)M=3
(4)M=4
図14は、本実施の形態に係る端末200の主要構成図である。端末200は、複数の単位バンドを用いて基地局100と通信する。また、端末200に設定される各単位バンドには、1フレームを構成するサブフレームの構成パターンであって、下り回線の通信に用いられる下り通信サブフレーム(DLサブフレーム)及び上り回線の通信に用いられる上り通信サブフレーム(ULサブフレーム)を含む構成パターン(UL-DL Configuration)が設定される。端末200において、復号部210が、複数の単位バンドでそれぞれ送信された下り回線データを再送用のバッファ(ソフトバッファ)に格納するとともに、下り回線データを復号し、応答信号生成部212が、下り回線データの誤り検出結果を用いて応答信号を生成し、無線送信部222が、複数の単位バンドのうち、第1の単位バンド(PCell)で受信された第1の下り回線データに対する応答信号、及び、第2の単位バンド(PCell)で受信された第2の下り回線データに対する応答信号を、第1の単位バンドを用いて送信する。ここで、上記ソフトバッファは、第1の下り回線データを格納する第1のバッファ(PCell用ソフトバッファ)と、第2の下り回線データを格納する第2のバッファ(SCell用ソフトバッファ)と、を有し、第2のバッファは、第1の単位バンドに設定された第1の構成パターンと、第2の単位バンドに設定された第2の構成パターンと、の組み合わせにより決定される特定の値(参照最大UL-DL Configuration)に基づいて、再送プロセス毎の領域(IRバッファ)に分割される。
図15は、本実施の形態に係る基地局100の構成を示すブロック図である。図15において、基地局100は、制御部101と、制御情報生成部102と、符号化部103と、変調部104と、符号化部105と、データ送信制御部106と、変調部107と、マッピング部108と、IFFT(Inverse Fast Fourier Transform)部109と、CP付加部110と、無線送信部111と、無線受信部112と、CP除去部113と、PUCCH抽出部114と、逆拡散部115と、系列制御部116と、相関処理部117と、A/N判定部118と、束A/N逆拡散部119と、IDFT(Inverse Discrete Fourier Transform)部120と、束A/N判定部121と、再送制御信号生成部122とを有する。
図16は、本実施の形態に係る端末200の構成を示すブロック図である。図16において、端末200は、無線受信部201と、CP除去部202と、FFT(Fast Fourier Transform)部203と、抽出部204と、復調部205と、復号部206と、判定部207と、制御部208と、復調部209と、復号部210と、CRC部211と、応答信号生成部212と、符号化・変調部213と、1次拡散部214−1,214−2と、2次拡散部215−1,215−2と、DFT部216と、拡散部217と、IFFT部218−1,218−2,218−3と、CP付加部219−1,219−2,219−3と、時間多重部220と、選択部221と、無線送信部222とを有する。
以上の構成を有する基地局100及び端末200の動作について説明する。
本実施の形態では、SCellの参照最大DL HARQプロセス数として、SCellがDL HARQタイミングのために参照するUL-DL Configurationが規定する最大DL HARQプロセス数を用いる場合について説明する。
実施の形態1では、クロスキャリアスケジューリング(Cross-carrier scheduling)非設定時(CIF(Cross Indicator Field)非設定時、若しくは、セルフスケジューリング(Self scheduling)設定時、と呼ばれることもある)について説明した。つまり、実施の形態1では、PCellのPDSCHに対するDL assignment(リソース割当情報)をPCellのPDCCHで通知され、SCellのPDSCHに対するDL assignmentをSCellのPDCCHで通知される場合について説明した。
本実施の形態では、各単位バンドのUL-DL Configurationが動的に切り替えられる場合(すなわち、TDD eIMTA適用時)について説明する。
200 端末
101,208 制御部
102 制御情報生成部
103,105 符号化部
104,107 変調部
106 データ送信制御部
108 マッピング部
109,218 IFFT部
110,219 CP付加部
111,222 無線送信部
112,201 無線受信部
113,202 CP除去部
114 PUCCH抽出部
115 逆拡散部
116 系列制御部
117 相関処理部
118 A/N判定部
119 束A/N逆拡散部
120 IDFT部
121 束A/N判定部
122 再送制御信号生成部
203 FFT部
204 抽出部
205,209 復調部
206,210 復号部
207 判定部
211 CRC部
212 応答信号生成部
213 符号化・変調部
214 1次拡散部
215 2次拡散部
216 DFT部
217 拡散部
220 時間多重部
221 選択部
Claims (16)
- 第1の下り回線データを第1の単位バンドで、第2の下り回線データを第2の単位バンドで端末装置へ送信および再送信し、前記第1の単位バンドには、上り回線サブフレームおよび下り回線サブフレームの第1の構成パターン(UL-DL Configuration)が設定され、前記第2の単位バンドには、上り回線サブフレームおよび下り回線サブフレームの第2の構成パターン(UL-DL Configuration)が設定される、送信部を備えた基地局装置と、
前記基地局装置から受信した前記第1の下り回線データと前記第2の下り回線データの再送データをソフトバッファに格納するメモリを備え、
前記第2の下り回線データを格納するソフトバッファは、前記上り回線サブフレームおよび前記下り回線サブフレームの参照構成パターンにおいて実行されるDL HARQ(DL hybrid automatic repeat request)再送プロセスの最大値に基づいて分割され、
前記DL HARQ再送プロセスの最大値は、前記参照構成パターンによって決定され、前記参照構成パターンは、前記第1の構成パターンと前記第2の構成パターンにより決定される、端末装置と、
を有する、LTE−A通信システム。 - 前記端末装置は、
前記第1の下り回線データおよび前記第2の下り回線データの誤り検出を行う制御部と、
前記第1の下り回線データおよび前記第2の下り回線データの誤り検出結果に対応する応答信号を前記第1の単位バンドで送信する送信部と、をさらに備える、
請求項1に記載のLTE−A通信システム。 - 前記端末装置は、前記参照構成パターンの上り回線サブフレームのタイミングで、前記第1の下り回線データおよび前記第2の下り回線データに対するACK/NACKを送信する、
請求項1に記載のLTE−A通信システム。 - 前記第1の構成パターンと前記第2の構成パターンとは異なり、
前記端末装置は、前記参照構成パターンの上り回線サブフレームのタイミングで、前記第1の下り回線データおよび前記第2の下り回線データに対するACK/NACKを送信する、
請求項1に記載のLTE−A通信システム。 - 前記第1の単位バンドはPrimary Cell、前記第2の単位バンドはSecondary Cellである、
請求項1に記載のLTE−A通信システム。 - Secondary Cellの下り回線サブフレームは、Primary Cellのセットを含むフレームに含まれ、
前記参照構成パターンは、前記第2の構成パターンと同じである、
請求項5に記載のLTE−A通信システム。 - Primary Cellの下り回線サブフレームは、Secondary Cellのセットを含むフレームに含まれ、
前記参照構成パターンは、前記第2の構成パターンと同じである、
請求項5に記載のLTE−A通信システム。 - 前記ソフトバッファは、前記第1の構成パターンと前記第2の構成パターンの複数の組み合わせに応じた複数の参照構成パターンを定義する第1のテーブルと、
前記複数の参照構成パターンから前記DL HARQ再送プロセスの最大値をそれぞれ定義する第2のテーブルと、を備える、
請求項1に記載のLTE−A通信システム。 - 基地局装置および端末装置を有するLTE−A通信システムで実行される送受信方法であって、
前記基地局装置から、第1の下り回線データを第1の単位バンドで、第2の下り回線データを第2の単位バンドで端末装置へ送信および再送信し、
前記第1の単位バンドには、上り回線サブフレームおよび下り回線サブフレームの第1の構成パターン(UL-DL Configuration)が設定され、前記第2の単位バンドには、上り回線サブフレームおよび下り回線サブフレームの第2の構成パターン(UL-DL Configuration)が設定され、
前記端末装置では、前記第1の下り回線データと前記第2の下り回線データの再送データがソフトバッファに格納され、
前記第2の下り回線データを格納するソフトバッファは、前記上り回線サブフレームおよび前記下り回線サブフレームの参照構成パターンにおいて実行されるDL HARQ(DL hybrid automatic repeat request)再送プロセスの最大値に基づいて分割され、
前記DL HARQ再送プロセスの最大値は、前記参照構成パターンによって決定され、前記参照構成パターンは、前記第1の構成パターンと前記第2の構成パターンにより決定される、
送受信方法。 - 前記端末装置において、
前記第1の下り回線データおよび前記第2の下り回線データの誤り検出を行い、
前記第1の下り回線データおよび前記第2の下り回線データの誤り検出結果に対応する応答信号を前記第1の単位バンドで送信する、
請求項9に記載の送受信方法。 - 前記端末装置において、前記参照構成パターンの上り回線サブフレームのタイミングで、前記第1の下り回線データおよび前記第2の下り回線データに対するACK/NACKを送信する、
請求項9に記載の送受信方法。 - 前記第1の構成パターンと前記第2の構成パターンとは異なり、
前記端末装置において、前記参照構成パターンの上り回線サブフレームのタイミングで、前記第1の下り回線データおよび前記第2の下り回線データに対するACK/NACKを送信する、
請求項9に記載の送受信方法。 - 前記第1の単位バンドはPrimary Cell、前記第2の単位バンドはSecondary Cellである、
請求項9に記載の送受信方法。 - Secondary Cellの下り回線サブフレームは、Primary Cellのセットを含むフレームに含まれ、
前記参照構成パターンは、前記第2の構成パターンと同じである、
請求項12に記載の送受信方法。 - Primary Cellの下り回線サブフレームは、Secondary Cellのセットを含むフレームに含まれ、
前記参照構成パターンは、前記第2の構成パターンと同じである、
請求項12に記載の送受信方法。 - 前記端末装置における前記ソフトバッファは、
前記第1の構成パターンと前記第2の構成パターンの複数の組み合わせに応じた複数の参照構成パターンを定義する第1のテーブルと、
前記複数の参照構成パターンから前記DL HARQ再送プロセスの最大値をそれぞれ定義する第2のテーブルと、を格納する、
請求項9に記載の送受信方法。
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