JP2007135226A - 通信方法および移動局 - Google Patents
通信方法および移動局 Download PDFInfo
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- JP2007135226A JP2007135226A JP2006346392A JP2006346392A JP2007135226A JP 2007135226 A JP2007135226 A JP 2007135226A JP 2006346392 A JP2006346392 A JP 2006346392A JP 2006346392 A JP2006346392 A JP 2006346392A JP 2007135226 A JP2007135226 A JP 2007135226A
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Abstract
【解決手段】本発明のスペクトル拡散通信装置は、圧縮モード時に圧縮されたフレームを間欠的に受信する無線周波数受信器25と、圧縮モード期間中の無伝送時間に第1サーチコードと第2サーチコードとを検出するタイミング/逆拡散器51と、それらのサーチコードを所定の基準で判定する検出判定器52と、検出判定器52にて検出される第1サーチコードおよび第2サーチコードに基づいて他の周波数キャリアとの同期を確立することにより異周波数間ハンドオーバを制御する制御器21Eと、を備える構成とした。
【選択図】 図41
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 無線周波数送信器
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 (4)
- 送信電力制御単位で制御される送信電力によって、通常モードの場合に非圧縮フレームを連続的に送信し、圧縮モードの場合に圧縮フレームを間欠的に送信する符号分割多元接続方式に基づく移動局における通信方法であって、
送信電力の増加または減少を指示する送信電力制御情報を受信する受信ステップと、
上記送信電力制御情報に基づいて上記非圧縮フレームまたは圧縮フレームの送信電力を上記送信電力制御単位で制御する制御ステップと、
を備え、
上記制御ステップでは、
上記非圧縮フレームに対しては第1の送信電力制御単位で送信電力を制御し、
上記圧縮フレームに対しては上記第1の送信電力制御単位より大きい送信電力制御単位を含む複数の送信電力制御単位を用いて送信電力を制御することを特徴とする通信方法。 - 上記制御ステップでは、
上記非圧縮フレームに対しては第1の送信電力制御単位で送信電力を制御し、
上記圧縮フレームに対しては上記第1の送信電力制御単位と、上記第1の送信電力制御単位より大きい第2の送信電力制御単位と、を用いて送信電力を制御することを特徴とする請求項1に記載の通信方法。 - 送信電力制御単位で制御される送信電力によって、通常モードの場合に非圧縮フレームを連続的に送信し、圧縮モードの場合に圧縮フレームを間欠的に送信する符号分割多元接続方式に基づく移動局であって、
送信電力の増加または減少を指示する送信電力制御情報を受信する受信手段と、
上記送信電力制御情報に基づいて上記非圧縮フレームまたは圧縮フレームの送信電力を上記送信電力制御単位で制御する制御手段と、
を備え、
上記制御手段は、
上記非圧縮フレームに対しては第1の送信電力制御単位で送信電力を制御し、
上記圧縮フレームに対しては上記第1の送信電力制御単位より大きい送信電力制御単位を含む複数の送信電力制御単位を用いて送信電力を制御することを特徴とする移動局。 - 上記制御手段は、
上記非圧縮フレームに対しては第1の送信電力制御単位で送信電力を制御し、
上記圧縮フレームに対しては上記第1の送信電力制御単位と、上記第1の送信電力制御単位より大きい第2の送信電力制御単位と、を用いて送信電力を制御することを特徴とする請求項3に記載の移動局。
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