JP4271716B2 - スペクトル拡散通信方法 - Google Patents
スペクトル拡散通信方法 Download PDFInfo
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- JP4271716B2 JP4271716B2 JP2007297980A JP2007297980A JP4271716B2 JP 4271716 B2 JP4271716 B2 JP 4271716B2 JP 2007297980 A JP2007297980 A JP 2007297980A JP 2007297980 A JP2007297980 A JP 2007297980A JP 4271716 B2 JP4271716 B2 JP 4271716B2
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- Control Of Motors That Do Not Use Commutators (AREA)
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- Measurement Of The Respiration, Hearing Ability, Form, And Blood Characteristics Of Living Organisms (AREA)
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Description
図1は、本発明の実施の形態1によるCDMAシステムを示すブロック図である。CDMAシステムは、送信機1Aおよび受信機2Aより構成され、基地局,移動局それぞれに設けられる。基地局と各移動局とは、CDMA通信方式により無線通信が行われる。
さて、前述した実施の形態1では、圧縮モード時のインタリーブおよびデインタリーブのためにメモリを増強してインタリーブサイズに応じた適切なインタリーブ対象時間を確保するようにしたが、本発明は、これに限定されず、以下に説明する実施の形態2のように、メモリの増強なしに、圧縮モードフレームの送信方法を変えることで適切なインタリーブ対象時間を確保するようにしてもよい。なお、本実施の形態2は全体構成を前述した実施の形態1と同様とするため、以下の説明では、構成および動作について相違する部分についてのみ説明する。また、構成上の符号については、同一構成については同様の符号を付す。
さて、前述した実施の形態1では、圧縮モード時のインタリーブおよびデインタリーブのためにメモリを増強してインタリーブサイズに応じた適切なインタリーブ対象時間を確保するようにしたが、本発明は、これに限定されず、以下に説明する実施の形態3のように、メモリの増強なしに、前述した実施の形態2とは異なる圧縮モードフレームの送信方法で適切なインタリーブ対象時間を確保するようにしてもよい。なお、本実施の形態3は全体構成を前述した実施の形態2と同様とするため、以下の説明では、動作について相違する部分についてのみ説明する。
さて、前述した実施の形態1〜3では、通常モードと圧縮モードのフレームタイミングを変更するようにしていたが、本発明は、これに限定されず、以下に説明する実施の形態4のように、圧縮モードでも通常モードと同じフレームタイミングで間欠送信するようにしてもよい。
さて、前述した実施の形態1〜4では、圧縮モードにおいて情報の欠落なくフレーム伝送するために送信電力を上げるようにしていたが、本発明は、これに限定されず、以下に説明する実施の形態5のように、送信電力量による他ユーザチャネルへの干渉を考慮して送信電力量を決定するようにしてもよい。
さて、前述した実施の形態5では、1フレームについてインタリーブを行うようにしていたが、本発明は、これに限定されず、以下に説明する実施の形態6のように、複数フレームに跨ってインタリーブを行ってインタリーブ時間の短縮を防止するようにしてもよい。なお、実施の形態6は、前述した実施の形態1の如くインタリーバのメモリサイズを増強する点を除けば、前述した実施の形態5と全体構成を同様としており、以下に、動作上の相違についてのみ説明する。
さて、前述した実施の形態1〜6では、圧縮モード時の伝送劣化の防止機能について説明していたが、本発明は、これに限定されず、以下に説明する実施の形態7のように、送信電力制御について送信電力制御量にバリエーションをもたせるようにしてもよい。
さて、前述した実施の形態7では、TPCビットの状態を増加と減少の2種類に限定していたが、本発明は、これに限定されず、以下に説明する実施の形態8のように、送信電力制御についてモード毎に送信電力制御量にバリエーションをもたせるようにしてもよい。なお、実施の形態8は、全体構成を前述した実施の形態7と同様するため、図示およびその説明を省略し、相違する動作についてのみ説明する。以下の説明では、図27で用いた符号を用いて説明する。
さて、前述した実施の形態1〜8では、圧縮モードにおける伝送フォーマットの構成をインタリーブ性能および送信電力制御精度を維持するために構成していたが、本発明は、これに限定されず、以下に説明する実施の形態9のように、使用する拡散符号数を減らすことを考慮して伝送フォーマットを決定してもよい。
さて、前述した実施の形態1〜9では、フレームをスロット化して間欠的に送信する期間を設け、その期間中の無伝送時間、すなわち、アイドル時間を利用して他の周波数キャリアの電力強度を測定する、ということを記述したが、実際の異周波数間ハンドオーバにおける、移動局の基地局への同期確立方法については記述していない。そこで、本発明では、異周波数間ハンドオーバの実現を可能とする通信装置およびその同期確立手順について説明する。
2A,2B,2C,2D,2E 受信機
11A,11B,11C,11D 制御器
13 インタリーバ
14A,14B,14C,14D,14E フレーム化/拡散器
15 無線周波数送信器
16 送信電力制御アンプ
21A,21B,21C,21D,21E 制御器
22 誤り訂正復号化器
23 デインタリーバ
24A,24B,24C,24D,24E デフレーム化/逆拡散器
25 無線周波数受信器
51 タイミング逆拡散器
52 検出判定器
53 スイッチ
100 送信機群
110 加算器
120 無線周波数送信機
200 圧縮モード制御器
201 圧縮モード管理器
202 フレーム組み合わせ制御器
203 拡散符号割り当て制御器
204 送信タイミング制御器
131A,131B,141A メモリ
Claims (2)
- 通常モードでは非圧縮フレームを連続的に送信し、圧縮モードでは圧縮フレームを間欠的に送信する符号分割多元接続システムにおける移動局が採用するスペクトル拡散通信方法であって、
圧縮モード時、基地局が下りフレームに対してビット単位のインタリーブを行った後上記インタリーブ後の下りフレームを圧縮し、さらにフレームウインドウの先端を含む前方部分と上記フレームウインドウの後端を含む後方部分とに分けて配置することにより無伝送時間を設けた圧縮下りフレームと、上記基地局が送信した当該移動局に対して上り送信電力の増加または減少を指示する上り送信電力制御情報と、を受信する受信ステップと、
上記受信した圧縮下りフレーム中の無伝送時間中に他の周波数成分を観測する観測ステップと、
上りフレーム送信時、
圧縮モード時は、上りフレームを圧縮して圧縮上りフレームを生成する圧縮ステップと、
上記受信した上り送信電力制御情報に基づいて、通常モードおよび圧縮モードでそれぞれ可変の上り送信電力制御単位で、上り送信電力を増加または減少させることにより、上記非圧縮上りフレームおよび上記圧縮上りフレームの上り送信電力を調整することが可能な調整ステップと、
を含むことを特徴とするスペクトル拡散通信方法。 - 前記移動局は、
前記上り送信電力制御情報に基づいて、前記通常モードでは複数の送信電力制御単位で、前記圧縮モードでは複数の送信電力制御単位で、上り送信電力を増加または減少させることにより、前記通常モードにおける前記非圧縮フレームおよび前記圧縮モードにおける前記圧縮フレームの送信電力を調整することを特徴とする請求項1に記載のスペクトル拡散通信方法。
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