JP2011045106A - ソフトハンドオフにある間送信パワーを制御するための方法及び装置 - Google Patents
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W52/00—Power management, e.g. Transmission Power Control [TPC] or power classes
- H04W52/04—Transmission power control [TPC]
- H04W52/30—Transmission power control [TPC] using constraints in the total amount of available transmission power
- H04W52/36—Transmission power control [TPC] using constraints in the total amount of available transmission power with a discrete range or set of values, e.g. step size, ramping or offsets
- H04W52/362—Aspects of the step size
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- H04W36/00—Hand-off or reselection arrangements
- H04W36/16—Performing reselection for specific purposes
- H04W36/18—Performing reselection for specific purposes for allowing seamless reselection, e.g. soft reselection
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W52/00—Power management, e.g. Transmission Power Control [TPC] or power classes
- H04W52/04—Transmission power control [TPC]
- H04W52/06—TPC algorithms
- H04W52/14—Separate analysis of uplink or downlink
- H04W52/143—Downlink power control
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W52/00—Power management, e.g. Transmission Power Control [TPC] or power classes
- H04W52/04—Transmission power control [TPC]
- H04W52/38—TPC being performed in particular situations
- H04W52/40—TPC being performed in particular situations during macro-diversity or soft handoff
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W52/00—Power management, e.g. Transmission Power Control [TPC] or power classes
- H04W52/04—Transmission power control [TPC]
- H04W52/06—TPC algorithms
- H04W52/12—Outer and inner loops
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Abstract
【解決手段】送信器20,32は通信リンクを通して分離された制御ユニット12に伴われる。それから制御ユニット12は最も適当な(likely)命令ストリームを引き出してそれを基地局に送る。第2の例示的な具体例では、制御ユニットは1周期内の最終または平均送信レベル及び各送信器からの1周期間のフィードバックのための総品質量を周期的に受信する。制御ユニット12はアラインされたパワーレベルを決定しそしてアラインされたパワーレベルを表示するメッセージを送信器に送信する。第3の例示的な具体例では、送信器20,32は受信器への送信の送信パワーを表示するメッセージを送る。制御ユニット12は現送信パワーに基づいてアラインされた送信パワーを決定する。
【選択図】図1
Description
図面を参照して、図1は基地局4及び基地局6とのソフトハンドオフにある移動局8を示す。ソフトハンドオフでは、基地局4及び基地局6は同一の情報を移動局8に送信する。パスダイバーシティは送信された信号の改良された推定(estimation)を供給しそして中断される呼(dropped call)の確率を減らす。ソフトハンドオフを実行するための例示的な具体例は、前述の米国特許番号5,101,501に詳細に示される。
I′=PNI ・I+PNQ ・Q (1)
Q′=PNI ・I−PNQ ・Q (2)
ここで、I及びQはPN拡散要素214の中のチャネル化された情報シーケンスである。
送信パワーレベルをアライメントするための第1の例示的な具体例では、基地局4及び6は基地局コントローラ2によって制御される。第1の例示的な具体例では、基地局4は移動局8からパワー制御命令を受信し、そしてそのパワー制御命令をバックホールトランシーバ18に供給する。バックホールトランシーバ18はパワー制御命令及び品質表示(quality indicators)を基地局コントローラ2に送信する。基地局コントローラ2は有線接続,光ファイバ接続または無線接続の手段によって基地局4及び6に接続される。
本発明の第2の例示的な具体例では、基地局コントローラ2は最終送信レベルを周期的に受信し、そして各基地局からの品質尺度を集める。例えば、基地局コントローラ2は20msごとに1度集中パワー制御を供給することを尋ねるだけであると仮定せよ。例示的な具体例では、毎秒800パワー制御命令が移動局8から送られる。このように、16命令は、基地局コントローラ2が送信パワーを変更するために介在する(intervenes)各時間の間、基地局4及び6によって受信されそして作用される。 基地局4では、パワー制御命令は移動局8から受信される。パワー制御命令は制御プロセッサ24に供給される。制御プロセッサはパワー調整命令を発生し、そしてその命令を送信サブシステム20に供給する。この調整命令は図7内のハードまたはソフトマッピングの1つによって発生され得る。制御プロセッサ24からのパワー調整命令に応じて、送信サブシステム20は移動局8への送信の送信パワーを強めるか、弱めるか、または維持させる。さらに、制御プロセッサ24は、それが基地局コントローラ2にパワー制御情報を送り返した最後の時以後、逆方向リンクフィードバックチャネルの品質を表示するランニング・メトリック(running metric)を発生する。品質表示が以下のものの1つまたは多数であってもよいことに注目せよ:逆方向リンクSNR,信号パワー,逆方向フレ−ム抹消,逆方向リンク再符号シンボルエラーレート,または逆方向ターボデコーダによる反復数。所定の時間間隔の終りで、制御プロセッサ24は蓄積された逆方向リンク品質メトリック及び移動局8への送信の現送信パワーを含むパワー制御メッセージを発生する。メッセージはバックホールトランシーバ18に供給され、そして基地局コントローラ2に送られる。
本発明の第4の例示的な具体例では、基地局コントローラ2は基地局4及び6からの送信の送信レベルを周期的に受信する。しかしながら、基地局コントローラ2は移動局8への信号の送信パワーがしきい値よりも発散した(diverged)時送信パワー補正メッセージを送るのみであろう。
アラインされた送信パワーレベルを決定するための第1の改良された方法では、計算されアラインされた送信パワーレベルは逆方向リンクパワー制御フィードバックのための品質表示に従って決定される。品質表示は受信された逆方向リンクパイロット信号の強さに基づき、または代わりとしてパイロットが各基地局でロック状態にある時間に基づくことができる。代わりとして、品質表示は与えられた基地局での逆方向リンクフレーム消失(erasures)の数または与えられた基地局上にロックされた全フィンガに渡って加算されたパイロットEc /Ntのような、移動局8での信号対妨害(interference)比に基づく。
第6の例示的な具体例では、送信器及び/または制御ユニットは受信されたフィードバック強度と送信レベル調整量との間にソフトマッピング(soft mapping)を適用する。すなわち、調整におけるステップサイズは、その値がフィードバック命令の信号対雑音比の値に依存する実数である。しきい値は、フィードバックの信号対雑音比が低すぎるときは、パワー制御のステップサイズがゼロであるように設定されてよい。さらに、送信器でフィードバック受信器がロック外でありそしていかなるフィードバックSNRも測定され得ないときは、送信レベルのためのいかなる対応する調整もないであろう。もしも制御ユニットが送信器でフィードバック命令の品質へのアクセスを有するならば、それは(第1の例示的な具体例としては)最も適当な(likely)命令を、あるいは(第2の例示的な具体例としては)最も最近のフィードバック品質に基づく最も適当な送信レベルまたはトラフィック対パイロット比を決定するために同じソフトマッピングを使用することができる。
Claims (6)
- 下記を具備する、第1の基地局及び第2の基地局が同時に移動局と通信している移動通信システム:
順方向リンク信号を移動局に送信するための及び逆方向リンク信号を移動局から受信するための及び第1の送信パワーメッセージを集中コントローラに送るための第1の基地局;
前記順方向リンク信号の冗長バージョンを前記移動局に送信するための及び前記逆方向リンク信号を前記移動局から受信するための及び第2の送信パワーメッセージを集中コントローラに送るための第2の基地局;及び 前記第1の送信パワーメッセージを受信するための及び前記第2の送信パワーメッセージを受信するための及び前記第1の送信パワーメッセージに従ってパワー制御命令を発生するための及び前記第2の送信パワーメッセージを受信するための及び前記第1の基地局と前記第2の基地局とにアラインされたパワー制御命令を送るためのコントローラ。 - 前記第1の送信パワーメッセージは前記移動局により送られたパワー制御命令の第1の推定を有し及び前記第2の送信パワーメッセージは前記移動局により送られたパワー制御命令の第2の推定を有する、請求項1の移動通信システム。
- 前記第1の基地局はさらに前記第1の基地局で受信された前記逆方向リンク信号の品質を指示する信号を送るための及び前記第2の基地局はさらに前記第2の基地局で受信された前記逆方向リンク信号の品質を指示する信号を送るための及び前記コントローラは前記第1の基地局で受信された前記逆方向リンク信号の品質を指示する前記信号と前記第2の基地局で受信された前記逆方向リンク信号の品質を指示する前記信号とに従って前記アラインされたパワー制御命令を発生する、請求項1の移動通信システム。
- 前記第1の送信パワーメッセージは前記第1の基地局から前記移動局への順方向リンク送信の送信レベルの指示を具備し及び前記第2の送信パワーメッセージは前記第2の基地局から前記移動局への順方向リンク送信の送信レベルの指示を具備する、請求項1の移動通信システム。
- 前記第1の基地局はパワー制御命令を後に決定された時間周期内の第1の数で前記移動局から受信する及び複数の第1の送信パワーメッセージを予め決定された時間周期内の第2の数で前記コントローラに送信する及び前記第1の数が前記第2の数以上である、請求項4の移動通信システム。
- 前記第1の送信パワーメッセージは前記第1の基地局により予め定められた時間間隔で受信された逆方向リンク信号の品質の蓄積されたメトリック表示を具備し及び前記第2の送信パワーメッセージは前記第1の基地局により予め定められた時間間隔で受信された順方向リンク信号の品質の蓄積されたメトリック表示を具備する、請求項4の移動通信システム。
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| US09/204,803 US6512925B1 (en) | 1998-12-03 | 1998-12-03 | Method and apparatus for controlling transmission power while in soft handoff |
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| JP2000586014A Division JP4723088B2 (ja) | 1998-12-03 | 1999-12-02 | ソフトハンドオフにある間送信パワーを制御するための方法及び装置 |
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| JP2010211205A Pending JP2011045106A (ja) | 1998-12-03 | 2010-09-21 | ソフトハンドオフにある間送信パワーを制御するための方法及び装置 |
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| EP (2) | EP2265062A3 (ja) |
| JP (2) | JP4723088B2 (ja) |
| KR (2) | KR100874101B1 (ja) |
| CN (2) | CN1172452C (ja) |
| AT (1) | ATE504179T1 (ja) |
| AU (1) | AU1840500A (ja) |
| DE (1) | DE69943320D1 (ja) |
| ES (1) | ES2360848T3 (ja) |
| HK (1) | HK1040845B (ja) |
| WO (1) | WO2000033480A1 (ja) |
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- 1999-12-02 AU AU18405/00A patent/AU1840500A/en not_active Abandoned
- 1999-12-02 JP JP2000586014A patent/JP4723088B2/ja not_active Expired - Fee Related
- 1999-12-02 KR KR1020077010231A patent/KR100874101B1/ko not_active Expired - Fee Related
- 1999-12-02 CN CNB998140279A patent/CN1172452C/zh not_active Expired - Fee Related
- 1999-12-02 DE DE69943320T patent/DE69943320D1/de not_active Expired - Lifetime
- 1999-12-02 EP EP10011197A patent/EP2265062A3/en not_active Withdrawn
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- 1999-12-02 KR KR1020017006875A patent/KR100788077B1/ko not_active Expired - Fee Related
- 1999-12-02 AT AT99961920T patent/ATE504179T1/de not_active IP Right Cessation
- 1999-12-02 HK HK02102354.4A patent/HK1040845B/zh not_active IP Right Cessation
- 1999-12-02 CN CNB031088031A patent/CN1287538C/zh not_active Expired - Fee Related
- 1999-12-02 ES ES99961920T patent/ES2360848T3/es not_active Expired - Lifetime
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2002
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Also Published As
| Publication number | Publication date |
|---|---|
| WO2000033480A1 (en) | 2000-06-08 |
| ATE504179T1 (de) | 2011-04-15 |
| JP4723088B2 (ja) | 2011-07-13 |
| EP1163739B1 (en) | 2011-03-30 |
| KR20010080660A (ko) | 2001-08-22 |
| KR20070055627A (ko) | 2007-05-30 |
| US20030054825A1 (en) | 2003-03-20 |
| US6810255B2 (en) | 2004-10-26 |
| US8285318B2 (en) | 2012-10-09 |
| DE69943320D1 (de) | 2011-05-12 |
| HK1040845A1 (en) | 2002-06-21 |
| CN1287538C (zh) | 2006-11-29 |
| US6512925B1 (en) | 2003-01-28 |
| HK1040845B (zh) | 2005-05-20 |
| CN1516354A (zh) | 2004-07-28 |
| CN1333958A (zh) | 2002-01-30 |
| EP2265062A3 (en) | 2012-10-31 |
| CN1172452C (zh) | 2004-10-20 |
| EP2265062A2 (en) | 2010-12-22 |
| AU1840500A (en) | 2000-06-19 |
| KR100874101B1 (ko) | 2008-12-16 |
| EP1163739A1 (en) | 2001-12-19 |
| US20050054366A1 (en) | 2005-03-10 |
| ES2360848T3 (es) | 2011-06-09 |
| KR100788077B1 (ko) | 2007-12-21 |
| JP2002531992A (ja) | 2002-09-24 |
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