JP2012100316A - 送信装置 - Google Patents
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- H04W52/18—TPC being performed according to specific parameters
- H04W52/24—TPC being performed according to specific parameters using SIR [Signal to Interference Ratio] or other wireless path parameters
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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Abstract
【解決手段】システム周波数帯域に複数の周波数チャネルが含まれ、前記周波数チャネルが等間隔で配置される複数のサブキャリアで構成される無線通信システムに適用され、送信装置であって、送信先のOFDM信号受信装置が、前記システム周波数帯域に含まれるすべての周波数チャネルを受信可能な全帯域受信装置であるか、または前記システム周波数帯域よりも周波数帯域幅が狭く、1つの周波数チャネルまたは複数の連続する周波数チャネルから構成される限定周波数帯域のみを受信可能な限定帯域受信装置であるかを判断し、前記判断の結果、前記OFDM信号受信装置が前記限定帯域受信装置である場合は、前記限定周波数帯域を用いて前記OFDM信号受信装置にデータを送信する。
【選択図】図16
Description
図4は、第1の実施形態に係る基地局の概略構成を示すブロック図である。アンテナ部1で受信された無線信号は、高周波回路およびアナログ処理部2によって無線信号から電気信号に変換され、FFT部3において、FFT(Fast Fourier Transform:高速フーリエ変換)が行なわれる。次に、等化部4において、マルチパスによる遅延歪などによって劣化した受信波形が補正され、サブキャリア復調部5において、サブキャリア毎に復調が行なわれる。
「最適な帯域幅」・・・要求データ転送量が大きい方が、優先順位が高い。
「距離やマルチパスによる受信特性」・・・各端末から送られてくる周波数チャネルの受信状態の良し悪しを比較し、なるべくより多くのデータを送信できる端末にその周波数チャネルを割り当てる。
「利用サービスの種類」・・・加入者の利用サービス体系の違いにより優先順位が異なる。例えば、月額基本料金を抑えて、混雑しているときは高品質を要求しないユーザや、通話ごとに品質を選んで指定するサービスを考慮して優先順位を付ける。また、例えば、リアルタイムな放送のようなデータであるが、品質を要求しないケースでは優先順位を下げる。
図10は、第2の実施形態に係るOFDMA通信システムにおけるDLの周波数チャネル配置の一例を示す図である。基地局が、周波数チャネル限定帯域端末への周波数チャネル割当てであると認識し、端末の受信帯域に隣接する周波数チャネルのすべてのサブキャリアに対して送信電力の大きさをゼロとしている。つまり、対応するサブキャリアを周波数チャネル分全てに拡大し、さらに電力を割当てないのと等価である。このことは、第1の実施形態では、あくまで隣接周波数チャネルに他ユーザを割当てた上で行なうのに対して、第2の実施形態では、隣接する周波数チャネルに他のユーザを最初から割当てないということで異なっている。
図11は、第3の実施形態に係るOFDMA通信システムにおける通信フレームの一例を示す図である。第1および第2の実施形態では、周波数軸での割り当てを基本に説明してきた。しかし、各通信相手への周波数チャネルの割り当ては、一定時間長のシンボル複数で定められる期間を時間チャネルとし、複数の時間チャネルと複数の周波数チャネルとから構成される通信フレームと呼ばれる単位を基本に行なう方法もある。つまり、1フレームの中から時間チャネルおよび周波数チャネルで特定される通信スロットの中で各通信相手に最適なスロットを割り当てる方法で、これ以降はこの通信フレーム単位での割り当てに本発明を適用した説明も交えることとする。この通信フレームは、周波数チャネルとして10個の周波数チャネルと、時間チャネルとして10個のタイムスロットを1フレームとした構成で説明する。そして、限定帯域端末として、1周波数チャネル限定帯域端末2台と2周波数チャネル限定帯域端末1台を割当てている。周波数チャネル#2のタイムスロット5番目から7番目にかけて1周波数チャネル限定帯域端末の1ユーザを割り当てており、10番目に別のユーザを割当てている。端末から限定帯域端末であることを通知された基地局は、周波数チャネル#1と#3のタイムスロット5から7と10に、第1の実施形態または第2の実施形態で説明した通信スロットを割当てる。
図12は、n周波数チャネルに限定した端末への周波数チャネル割当を示す図である。ここでは、全周波数帯域の両端の周波数チャネルを、限定帯域端末に対して優先的に割り当てる。この図12では、周波数チャネル#1もしくは#10側から割り当てている。第5の実施形態によれば、対策用スロットを施す必要がある周波数チャネルは片側隣接のみとなり、スロットをより有効に利用できる。
図13は、第5の実施形態に係る限定帯域端末への周波数チャネル割当を示す図である。図13中、紙面に向かって左側に示したように、予めサブキャリア限定数に対して専用周波数チャネルを設定しておく。さらに限定帯域端末は、できるだけ同一のタイムスロットを使用するように、連接するように割り当てる。これにより、対策用スロットを共通化することができ、通信スロットの利用効率が高まる。
図16は、第6の実施形態に係るOFDMA通信システムにおける通信フレームの一例を示す図である。基地局は、n限定帯域端末に割り当てる周波数チャネルに隣接する周波数チャネルを他の端末に割当てる際には、その限定帯域端末が受信可能な周波数範囲の両端から内側へ任意の数のサブキャリアに電力を与えない。これは、任意の数のサブキャリアについて、品質が悪いという情報を基地局に対して通知することによって、限定帯域端末が主導で該当サブキャリアへ電力の割当てを行わない方式である。
図20は、第7の実施形態に係るOFDMA通信システムにおける通信フレームの一例を示す図である。第7の実施形態では、基地局は、端末毎に受信電力を検出する。そして、限定帯域端末が割当てられた周波数チャネルにおいて、隣接チャネルに他の端末を割当てる際は、基地局に近い等により受信電力が高い端末を割り当てる。そして、そのスロットの送信電力を、限定帯域端末に割り当てられた周波数チャネルの電力より低く設定する。このような送信電力の制御は、上記各実施形態と併用することも可能である。
第8の実施形態は、第1、第2および第7の実施形態の機能を併せ持つことを特徴としている。図21および図22は、第8の実施形態に係る基地局の動作を示すフローチャートである。同図において、「k」はループごとに処理する優先順位をインクリメントする。「i」は整数であり、端末の優先順位の決定や、優先順位順に処理するためのループに用いる。「B」は割り当て残となっている端末からの要求伝送帯域の合計を表わす。「NLSC」は限定帯域端末の限定周波数チャネル数を表わす。「NRSC」は各端末が要求している周波数チャネル数を表わす。「GBH」は0または1であり、上(周波数の高い)側隣接周波数チャネルへの対策を”1”なら実施、”0”なら不要を表わす。「GBL」は0または1であり、下(周波数の低い)側隣接周波数チャネルへの対策を”1”なら実施、”0”なら不要を表わす。なお、図21および図22における「k」および「i」は、図18および図19における「k」および「i」とは異なる意味で使用している。
2 高周波回路およびアナログ処理部
3 FFT部
4 等化部
5 サブキャリア復調部
6 端末受信品質情報処理部
7 制御部
8 ユーザ情報格納部
9 送信データバッファ
10 スケジューリング部
10−1 判定部
10−3 周波数チャネル割り当て部
11 サブキャリア変調部
12 サブキャリア電力制御部
13 IFFT部
161 アンテナ部
162 高周波回路部
163 伝搬路推定部
164 FFT部
165 等化部
166 サブキャリア復調部
167 受信品質情報データ生成部
168 制御部
169 送信信号処理部
Claims (1)
- システム周波数帯域に複数の周波数チャネルが含まれ、前記周波数チャネルが等間隔で配置される複数のサブキャリアで構成される無線通信システムに適用され、少なくとも一つの周波数チャネルで構成されるOFDM信号を送信する送信装置であって、
送信先のOFDM信号受信装置が、前記システム周波数帯域に含まれるすべての周波数チャネルを受信可能な全帯域受信装置であるか、または前記システム周波数帯域よりも周波数帯域幅が狭く、1つの周波数チャネルまたは複数の連続する周波数チャネルから構成される限定周波数帯域のみを受信可能な限定帯域受信装置であるかを判断し、
前記判断の結果、前記OFDM信号受信装置が前記限定帯域受信装置である場合は、前記限定周波数帯域を用いて前記OFDM信号受信装置にデータを送信することを特徴とする送信装置。
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JP (6) | JPWO2006077696A1 (ja) |
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