JP4938817B2 - 変化したデータレートを持つ順方向リンク負荷の推定 - Google Patents
変化したデータレートを持つ順方向リンク負荷の推定 Download PDFInfo
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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
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/50—Allocation or scheduling criteria for wireless resources
- H04W72/54—Allocation or scheduling criteria for wireless resources based on quality criteria
- H04W72/542—Allocation or scheduling criteria for wireless resources based on quality criteria using measured or perceived quality
-
- 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]
- H04W52/18—TPC being performed according to specific parameters
- H04W52/26—TPC being performed according to specific parameters using transmission rate or quality of service QoS [Quality of Service]
-
- 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
- H04W52/34—TPC management, i.e. sharing limited amount of power among users or channels or data types, e.g. cell loading
-
- 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
- H04W52/44—TPC being performed in particular situations in connection with interruption of transmission
-
- 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]
- H04W52/54—Signalisation aspects of the TPC commands, e.g. frame structure
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/50—Allocation or scheduling criteria for wireless resources
- H04W72/52—Allocation or scheduling criteria for wireless resources based on load
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/50—Allocation or scheduling criteria for wireless resources
- H04W72/56—Allocation or scheduling criteria for wireless resources based on priority criteria
- H04W72/566—Allocation or scheduling criteria for wireless resources based on priority criteria of the information or information source or recipient
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
- H04W88/08—Access point devices
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
- H04W88/12—Access point controller devices
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- Engineering & Computer Science (AREA)
- Quality & Reliability (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Mobile Radio Communication Systems (AREA)
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Description
一実施形態において、移動局(mobile stations;MS)は、少なくとも、次のチャネルの同時動作をサポートする。
2.逆方向補足チャネル(Reverse Supply Channel;R−SCH)
逆方向基本チャネル(R−FCH):音声のみのMSが、アクティブ音声呼を有する場合、該音声呼は、該R−FCHで伝送される。データのみのMSの場合には、R−FCHは、シグナリング及びデータを伝送する。典型的なR−FCHチャネルフレームサイズ、符号化、変調及びインタリービングは、2002年6月のTIA/EIA−IS−2000.2「デュアルモード広帯域スペクトル拡散セルラー方式のための移動局/基地局の互換性規格(Mobile Station-Base Station Compatibility Standard for Dual-Mode Wideband Spread Spectrum Cellular System)」で指定されている。
一実施形態において、上記BSは、次の本質的な機能、すなわち、
・R−FCH/R−SCHの復号
・電力制御
を実行する。
上記MSにより同時に送信された多数の情報チャネルがある場合、該情報チャネルの各々は、対応するウォルシュシーケンス(Walsh sequence)と関連付けられた後に復号される。
CDMA方式における電力制御は、所望のサービスの品質(quality of service;QoS)を維持することが最も重要である。IS−2000において、各MSのRLパイロットチャネル(RL pilot channel;R−PICH)は、所望のしきい値に閉ループ電力制御される。上記BSにおいて、電力制御設定値と呼ばれるこのしきい値は、受信したEcp/Ntと比較されて、電力制御コマンド(閉ループPC)が生成され、この場合Ecpは、チップごとのパイロットチャネルエネルギである。情報チャネルに対して所望のQoSを実現するためには、該BSにおけるしきい値は、該情報チャネルのイレイジャー(erasures)に変えられ、データレートが変化した場合には、調節しなければならない。
・外ループ電力制御
・レート変化
により発生する。
設定値の調節は、Rnew>Roldの場合、新たなR−SCHデータレートに先立って、ΔPCGによって行われる。そうでない場合、この調節は、R−SCHフレーム境界で行われる。それに伴って、パイロット電力は、図2に示すように、閉ループの約1dBずつ補正レベルまで増減する。
スケジューラは、上記BSCまたはBTSと同じ場所に配置してもよく、または、ネットワーク層のいくつかの要素に配置してもよい。スケジューラは、より低層のリソースを共用するこれらMSをスケジューリングすることに責任がある各部分に対して多層であってもよい。例えば、ソフトハンドオフ(soft−handoff;SHO)中でないMSは、BTSによってスケジュールすることができ、SHO中のMSは、BSCと同じ場所に配置されたスケジューラの一部によってスケジュールすることができる。逆方向リンク容量は、スケジューリングのために、BTSとBSCとに配分される。
仮定された同期スケジューリングを考慮すると、要求、許可及び伝送に関連するほとんどのイベントは、期間SCH_PRDに対して周期的である。
・スケジューリングのタイミング
・スケジュールされたレート伝送
・MS R−SCHレート要求。
2.最後のSCRM/SCRMMが、時刻τiに送信され、現在の時刻が、τi+SCH_PRD以上であり、かつ該MSが、そのバッファ内に、BUF_DEPTHを超えるデータを有しており、かつ該MSが、ゼロでないレートで送信するのに十分な電力を有している。または、
3.最後のSCRM/SCRMMが、時刻τiに送信され、現在の時刻が、τi+SCH_PRD以上であり、かつ受信したESCAMM/ESCAMに基づく該MS側での現在の割当レートは、(該MSが、ゼロでないレートを要求するデータまたは電力を有していなくてもよいということに関係なく)ゼロではない。「現在の割当レート」は、現在のレート伝送に適用可能な割当レートである。現在のスケジュールされた期間中に、ESCAMが受信されていない場合には、該割当レートが0であると考えられる。ある後の時刻における動作時間を有するESCAM/ESCAMMメッセージで割当てられたレートは、該動作時間の後に実施される。
一実施形態においては、非常に多数のセルに対して、1つの集中型スケジューラ要素がある。該スケジューラは、上記システムにおける全てのMS及び各MSのアクティブセットにおけるBSのリストを維持する。各MSに関連して、該スケジューラは、MSのキューサイズ(Q^)の推定と、最大スケジュールレート(Rmax(s))とを格納する。
Q^=SCRMMで報告されたキューサイズ
に更新される。
Q^=Q^−Datatx(FCH)+Datatx(SCH)
ただし、Datatx(FCH)及びDatatx(SCH)は、(フレームが正しく復号された場合)それぞれ、物理層オーバヘッド及びRLP層オーバヘッドが減少した後の最後のR−FCH及びR−SCHフレームで送信されたデータである。
j番目のセクタにおけるセクタ容量は、測定されたMSのSinrsから推定される。該Sinrは、アンテナごとの平均パイロット加重結合Sinrである。一実施形態において、電力制御グループ(PCG)ごとの結合は、当該セクタの多数のフィンガ及び異なるアンテナにわたって結合するパイロット加重である。一実施形態において、PCGごとの結合は、多数のフィンガ及び異なるアンテナにわたって結合する最大比である。該結合は、ソフトハンドオフMSの場合には、異なるセクタにわたらない。平均化は、フレームの持続期間に行うことができ、PCGの対にわたるフィルタリングした平均とすることができる。
Loadj(BSC)+Loadj(BTS)≦1−(1+IOC/NO)/ROT(max)
となる。
(スケジューリングアルゴリズム)
スケジューリングアルゴリズムは、次の特徴を有する。
a)TDMゲインを増加させるためのMSの最少数をスケジューリングすること、
b)最大容量利用のためのCDMの少数ユーザ、及び、
c)MSレート要求の優先順位付け。
Claims (12)
- 前記ソフトハンドオフ係数を決定することは、平均受信パイロット電力に基づく請求項1に記載の方法。
- 前記比例公平性値はラウンドロビン公平性値である請求項1に記載の方法。
- 前記比例公平性値を決定することは、平均送信レートに対する最大要求レートの比に基づく請求項1に記載の方法。
- 前記ソフトハンドオフ係数を決定する手段は、平均受信パイロット電力に基づいて決定する請求項5に記載の装置。
- 前記比例公平性値はラウンドロビン公平性値である請求項5に記載の装置。
- 前記比例公平性値を決定する手段は、平均送信レートに対する最大要求レートの比に基づいて決定する請求項5に記載の装置。
- レート割当に関して局をスケジューリングするための優先度を決定する方法を実行する、プロセッサによって実行可能な命令のプログラム、を組み込んだコンピュータ読取可能記録媒体であって、
前記方法は、
測定された、雑音プラス干渉に対するパイロットエネルギ比(Ecp/Nt)を決定することと、
ソフトハンドオフ係数(SHOfactor)を決定することと、
比例公平性値(PF)を決定することと、
公平性係数αを決定することと、
前記雑音プラス干渉に対するパイロットエネルギ比、前記ソフトハンドオフ係数、前記比例公平性値、及び前記公平性係数αを用いて、
前記決定された優先度w i にしたがって、前記局のレート割当を行うことと
を備えるコンピュータ読取可能記録媒体。 - 前記ソフトハンドオフ係数を決定することは、平均受信パイロット電力に基づく請求項9に記載のコンピュータ読取可能記録媒体。
- 前記比例公平性値はラウンドロビン公平性値である請求項9に記載のコンピュータ読取可能記録媒体。
- 前記比例公平性値を決定することは、平均送信レートに対する最大要求レートの比に基づく請求項9に記載のコンピュータ読取可能記録媒体。
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US40982002P | 2002-09-10 | 2002-09-10 | |
US60/409,820 | 2002-09-10 | ||
US10/640,720 US8504054B2 (en) | 2002-09-10 | 2003-08-13 | System and method for multilevel scheduling |
US10/640,720 | 2003-08-13 |
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JP2004536196A Division JP4643265B2 (ja) | 2002-09-10 | 2003-09-10 | 変化したデータレートを持つ順方向リンク負荷の推定 |
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JP2009246981A JP2009246981A (ja) | 2009-10-22 |
JP4938817B2 true JP4938817B2 (ja) | 2012-05-23 |
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JP2009113024A Expired - Fee Related JP4938817B2 (ja) | 2002-09-10 | 2009-05-07 | 変化したデータレートを持つ順方向リンク負荷の推定 |
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US (2) | US8504054B2 (ja) |
EP (2) | EP1540980B1 (ja) |
JP (2) | JP4643265B2 (ja) |
KR (1) | KR101028973B1 (ja) |
AT (1) | ATE428283T1 (ja) |
AU (1) | AU2003278800A1 (ja) |
BR (1) | BR0314161A (ja) |
CA (1) | CA2498128A1 (ja) |
DE (1) | DE60327083D1 (ja) |
MX (1) | MXPA05002631A (ja) |
RU (1) | RU2005110427A (ja) |
TW (1) | TWI328976B (ja) |
WO (1) | WO2004025986A2 (ja) |
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2003
- 2003-08-13 US US10/640,720 patent/US8504054B2/en not_active Expired - Fee Related
- 2003-09-10 WO PCT/US2003/028671 patent/WO2004025986A2/en active Search and Examination
- 2003-09-10 KR KR1020057004171A patent/KR101028973B1/ko active IP Right Grant
- 2003-09-10 RU RU2005110427/09A patent/RU2005110427A/ru not_active Application Discontinuation
- 2003-09-10 BR BR0314161-6A patent/BR0314161A/pt not_active IP Right Cessation
- 2003-09-10 DE DE60327083T patent/DE60327083D1/de not_active Expired - Lifetime
- 2003-09-10 JP JP2004536196A patent/JP4643265B2/ja not_active Expired - Fee Related
- 2003-09-10 TW TW092125078A patent/TWI328976B/zh not_active IP Right Cessation
- 2003-09-10 AU AU2003278800A patent/AU2003278800A1/en not_active Abandoned
- 2003-09-10 EP EP03770317A patent/EP1540980B1/en not_active Expired - Lifetime
- 2003-09-10 EP EP09001418A patent/EP2048906A3/en not_active Withdrawn
- 2003-09-10 AT AT03770317T patent/ATE428283T1/de not_active IP Right Cessation
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EP1540980B1 (en) | 2009-04-08 |
US8504047B2 (en) | 2013-08-06 |
JP2009246981A (ja) | 2009-10-22 |
US20090170523A1 (en) | 2009-07-02 |
RU2005110427A (ru) | 2005-11-10 |
KR20050048629A (ko) | 2005-05-24 |
TW200421894A (en) | 2004-10-16 |
MXPA05002631A (es) | 2005-06-08 |
WO2004025986A3 (en) | 2004-11-18 |
EP2048906A2 (en) | 2009-04-15 |
EP2048906A3 (en) | 2009-06-17 |
US8504054B2 (en) | 2013-08-06 |
ATE428283T1 (de) | 2009-04-15 |
KR101028973B1 (ko) | 2011-04-12 |
JP4643265B2 (ja) | 2011-03-02 |
TWI328976B (en) | 2010-08-11 |
BR0314161A (pt) | 2006-01-17 |
JP2005538650A (ja) | 2005-12-15 |
EP1540980A2 (en) | 2005-06-15 |
US20040185868A1 (en) | 2004-09-23 |
AU2003278800A1 (en) | 2004-04-30 |
CA2498128A1 (en) | 2004-03-25 |
DE60327083D1 (de) | 2009-05-20 |
WO2004025986A2 (en) | 2004-03-25 |
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