JP5004951B2 - 無線通信ネットワークにおける現在のチャネル状態を評価する方法 - Google Patents
無線通信ネットワークにおける現在のチャネル状態を評価する方法 Download PDFInfo
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- JP5004951B2 JP5004951B2 JP2008514662A JP2008514662A JP5004951B2 JP 5004951 B2 JP5004951 B2 JP 5004951B2 JP 2008514662 A JP2008514662 A JP 2008514662A JP 2008514662 A JP2008514662 A JP 2008514662A JP 5004951 B2 JP5004951 B2 JP 5004951B2
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- current channel
- channel quality
- downlink
- power control
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
- H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
- H04L1/1607—Details of the supervisory signal
- H04L1/1671—Details of the supervisory signal the supervisory signal being transmitted together with control information
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/003—Arrangements for allocating sub-channels of the transmission path
- H04L5/0053—Allocation of signaling, i.e. of overhead other than pilot signals
- H04L5/0057—Physical resource allocation for CQI
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W24/00—Supervisory, monitoring or testing arrangements
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
- H04W52/04—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]
- H04W52/265—TPC being performed according to specific parameters using transmission rate or quality of service QoS [Quality of Service] taking into account the quality of service QoS
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
- H04W52/04—TPC
- H04W52/54—Signalisation aspects of the TPC commands, e.g. frame structure
- H04W52/58—Format of the TPC bits
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
- H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
- H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
- H04L1/1812—Hybrid protocols; Hybrid automatic repeat request [HARQ]
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- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Computer Networks & Wireless Communication (AREA)
- Quality & Reliability (AREA)
- Mobile Radio Communication Systems (AREA)
Description
図2は、DPDCH240と、DPCCH220と、高速専用物理制御チャネル(HS−DPCCH)235とを含むUMTSアップリンク専用通信チャネル250のフレーム200の例を示す。各フレーム200は、例えば10ミリ秒(ms)の長さを有してよく、DPCCH220に対しては、複数のスロット205(例えば、15スロット)に分割されてよい。各スロット205は、例えば2560チップの長さを有してよく、これは1電力制御周期に対応してよく、例えば2/3msの継続時間を有してよい。DPCCH220を、図3に関して以下にさらに詳細に説明する。
TFCI223は、UEから送信された情報の転送形式(例えば、音声および/またはデータ・パケット、フレーム等)をNodeBに通知してよい。
図5は従来のCQI420報告の通信図を示す。
所与のUE(例えば、UE105、110等)におけるチャネル品質はCQI計測ウィンドウ内で(S505で)計測される。チャネル品質が(S505で)計測された後に、所与のUEはその計測したチャネル品質をCQI420に変換し、計測したチャネル品質を表すそのCQI420をNodeB(例えば、NodeB120、122、124等)に(S510で)送信する。このCQI420は、UEからNodeBへの送信中に伝搬遅延を(S515で)受け、所与のUEにより最初に送信された時よりも遅くNodeBに到着する。NodeBは、このCQI420を(S520で)受信し、NodeBのスケジューラにこのCQI420を転送し、CQI420はこの転送中に処理遅延を(S525で)受ける。NodeBのスケジューラはこのCQI420を(S530で)受信し、受信したCQI420に基づいて、NodeBから所与のUEへの送信のため、ダウンリンク電力(例えば、HS−SCCH電力)に対する調整をスケジュール化し、および/またはHS−PDSCHのためのMCSを選択する。スケジュール化されたダウンリンク電力に対する調整は、次のダウンリンク送信で(S535で)効果が生じてよい。所与の個数のサブフレームが、チャネル品質の計測(工程S505における)とスケジュール化されたダウンリンク電力に対する調整(S535における)の間に消滅してしまう可能性があり、この所与の個数のサブフレームは少なくともmin_CQI_Tの数に達し、max_CQI_Tを超えない数に達する。一例では、min_CQI_Tは、およそ9msであってよく、これは、4.5サブフレームまたは13.5スロットに相関する可能性がある。工程S515およびS525の伝搬遅延/処理遅延などの様々な要因がmin_CQI_Tに影響する可能性がある。
本発明の実施形態例が次に説明されるが、この実施形態例では、現在のチャネル品質が、NodeBのスケジューラで受信した前のCQI420に基づき、前のCQI420の後にNodeBのスケジューラで受信したTPC命令222をさらに考慮して予測される。上述のように、従来技術は現在のチャネル品質として前のCQI420のみを用いる。
このような変更は本発明の例示の実施形態の精神および範囲からの逸脱とは見なされず、当業者に明白であるような修正はすべて本発明の範囲内に含まれることを意味する。
Claims (8)
- 現在のチャネル状態を評価する方法において、
第1のチャネル品質インジケータを受信する工程、及び
前記チャネル品質インジケータ及び電力制御情報の総和に基づいて現在のチャネル品質を評価する工程を含み、
前記総和に含まれる電力制御情報は、少なくとも2つの送信電力制御インターバルに亘って受信される電力制御情報のみとし、
前記少なくとも2つの送信電力制御インターバルは、前記第1のチャネル品質インジケータの受信と次のチャネル品質インジケータの受信との間に生じることを特徴とする現在のチャネル状態を評価する方法。 - 前記電力制御情報は送信電力を増加または減少させるかを示すことを特徴とする請求項1に記載の現在のチャネル状態を評価する方法。
- 前記送信電力に対する前記増加または減少は所与の増分量に基づくことを特徴とする請求項1または2に記載の現在のチャネル状態を評価する方法。
- 前記電力制御情報は少なくとも1つの送信電力制御ビットを含むことを特徴とする請求項2に記載の現在のチャネル状態を評価する方法。
- 前記第1のチャネル品質インジケータは、前記現在のチャネル品質を評価する工程の前の最新の受信チャネル品質インジケータであることを特徴とする請求項1に記載の現在のチャネル状態を評価する方法。
- 前記評価された現在のチャネル品質に基づきダウンリンク・チャネル上のダウンリンク送信パラメータを調整する工程をさらに含むことを特徴とする請求項1に記載の現在のチャネル状態を評価する方法。
- 前記ダウンリンク送信パラメータはダウンリンク送信電力を含み、前記調整工程は前記ダウンリンク・チャネル上の前記ダウンリンク送信電力を増加または減少させることを特徴とする請求項6に記載の現在のチャネル状態を評価する方法。
- 前記ダウンリンク送信パラメータはデータ符号化パラメータを含み、前記調整工程は前記ダウンリンク・チャネル上の符号化のレベルを増加または減少させることを特徴とする請求項6に記載の現在のチャネル状態を評価する方法。
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
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US11/139,693 US8965440B2 (en) | 2005-05-31 | 2005-05-31 | Method of estimating a current channel condition in a wireless communications network |
US11/139,693 | 2005-05-31 | ||
PCT/US2006/017265 WO2006130304A1 (en) | 2005-05-31 | 2006-05-05 | Method of estimating a current channel condition in a wireless communications network |
Publications (2)
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JP2008546310A JP2008546310A (ja) | 2008-12-18 |
JP5004951B2 true JP5004951B2 (ja) | 2012-08-22 |
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JP2008514662A Expired - Fee Related JP5004951B2 (ja) | 2005-05-31 | 2006-05-05 | 無線通信ネットワークにおける現在のチャネル状態を評価する方法 |
Country Status (6)
Country | Link |
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US (1) | US8965440B2 (ja) |
EP (1) | EP1886417B1 (ja) |
JP (1) | JP5004951B2 (ja) |
KR (1) | KR101228234B1 (ja) |
CN (2) | CN101185258A (ja) |
WO (1) | WO2006130304A1 (ja) |
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CN104901784A (zh) | 2015-09-09 |
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US8965440B2 (en) | 2015-02-24 |
EP1886417B1 (en) | 2013-01-16 |
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