TWM242940U - Time division synchronous code division multiple access user equipment using pathloss aided closed loop power control - Google Patents
Time division synchronous code division multiple access user equipment using pathloss aided closed loop power control Download PDFInfo
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- TWM242940U TWM242940U TW091216059U TW91216059U TWM242940U TW M242940 U TWM242940 U TW M242940U TW 091216059 U TW091216059 U TW 091216059U TW 91216059 U TW91216059 U TW 91216059U TW M242940 U TWM242940 U TW M242940U
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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
- H04W52/22—TPC being performed according to specific parameters taking into account previous information or commands
- H04W52/228—TPC being performed according to specific parameters taking into account previous information or commands using past power values or information
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/24—Radio transmission systems, i.e. using radiation field for communication between two or more posts
- H04B7/26—Radio transmission systems, i.e. using radiation field for communication between two or more posts at least one of which is mobile
- H04B7/2618—Radio transmission systems, i.e. using radiation field for communication between two or more posts at least one of which is mobile using hybrid code-time division multiple access [CDMA-TDMA]
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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
- H04W52/06—TPC algorithms
- H04W52/08—Closed loop power control
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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
- H04W52/22—TPC being performed according to specific parameters taking into account previous information or commands
- H04W52/226—TPC being performed according to specific parameters taking into account previous information or commands using past references to control power, e.g. look-up-table
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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
- H04W52/24—TPC being performed according to specific parameters using SIR [Signal to Interference Ratio] or other wireless path parameters
- H04W52/242—TPC being performed according to specific parameters using SIR [Signal to Interference Ratio] or other wireless path parameters taking into account path loss
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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
- H04W52/24—TPC being performed according to specific parameters using SIR [Signal to Interference Ratio] or other wireless path parameters
- H04W52/243—TPC being performed according to specific parameters using SIR [Signal to Interference Ratio] or other wireless path parameters taking into account interferences
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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
- H04W52/24—TPC being performed according to specific parameters using SIR [Signal to Interference Ratio] or other wireless path parameters
- H04W52/248—TPC being performed according to specific parameters using SIR [Signal to Interference Ratio] or other wireless path parameters where transmission power control commands are generated based on a path parameter
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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
- H04W52/22—TPC being performed according to specific parameters taking into account previous information or commands
- H04W52/221—TPC being performed according to specific parameters taking into account previous information or commands using past power control commands
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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
- H04W52/30—TPC using constraints in the total amount of available transmission power
- H04W52/36—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
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
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- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Mobile Radio Communication Systems (AREA)
- Transmitters (AREA)
- Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
- Radio Relay Systems (AREA)
Description
M242940 ⑴ 掴、新型說· , (新型說明應敘明:新型所屬之技術領域、先前技術、内容、實施方式及圖式簡單說明) 創作背景 本創作一般係關於展頻通信系統。更尤甚者,本創作係 關於在該等系統中控制傳送功率位準。 在許多展頻通信系統中,多重使用者通信係透過一共享 之頻譜予以傳送。在劃碼多重存取(CDMA)通信系統中, 多重通信係用不同之碼予以傳送以彼此區別。在劃時雙工 /劃碼多重存取(TDD/CDMA)及劃時同步CDMA (TD-SCDMA) 通信系統,頻譜亦經過時域分剔而得以更加妥善利用。 由於多重通信係在相同頻譜中傳送,故通信會彼此干 擾。為了降低通信彼此感應而生之干擾,故使用適應性功 率控制。適應性功率控制的目的在於以最小功率位準傳送 每一個通信而達到指定之接收品質,如目標信號對干擾比 (SIR)。 一種實現適應性功率控制之架構為封閉式迴路功率控 制。在封閉式迴路功率控制中,一傳送器以一特定功率位 準傳送一通信。一目標接收器接收通信並量測所接收信號 之S IR。量測到之S IR係與一目標s 1R相比較。若量測到之 SIR大於目標SIR,則送出一指示該傳送器應減少其傳送 功率之功率控制命令。若量測到之S IR小於或等於目標 S IR,則送出一指示該傳送器應增加其功率位準之功率命 令。功率控制命令一般係一指示增加或者減少功率位準之 單一位元。該等頻率一般係在tdd/cdMa及TD-SCDMA中以 每秒1 0 0至2 0 0個命令之頻率丁以送出。 傳送器接收功率命令立回應遠功率命令以一固定量改
M242940 變其傳送功率位準,例如將傳送功率位準增加或減少1 dB。當通道狀況呈高度動態時,封閉式迴路功率控制對於 補償通道狀況可能不夠快。從而使接收到的信號品質下降 到低於可接收的位準。 因此,期望用其它方法達到功率控制。 創作概述 一劃時雙工/劃碼多重存取(TDD/SCDMA)使用者設備具 有一傳送功率命令接收暨裁決裝置、一天線、一參考信號 功率量測裝置、一路徑損耗判斷裝置、一傳送功率控制判 斷裝置、一調變暨傳播裝置以及一放大器。參考信號功率 量測裝置量測一接收到的參考信號功率位準。路徑判斷裝 置將所接收量測到的參考信號功率位準與一參考信號傳 送功率位準相比較以產生一參考信號之路徑損耗估計。傳 送功率控制判斷裝置使用所產生的路徑損耗估計判斷一 傳送功率位準變化大小並用於回應傳送功率命令以一經 過判斷之改變量大小判斷對傳送功率位準之調整。 圖示簡述 圖1係一路徑損耗輔助性封閉式迴路功率控制具體實施 例之流程圖。 圖2係一使用路徑損耗輔助性封閉式迴路功率控制之傳 送及接收站之簡化方塊圖。 詳細創作說明 雖然路徑損耗輔助性封閉式迴路功率控制係以較佳 TDD/CDMA及TD-SCDMA予以闡明,仍可將路徑損耗輔助性 封閉式迴路功率控制應用於其它經歷上傳與下傳之間通 M242940 (3) 新盤_觸育讀1 道互換性之通信系統。 一較佳路徑損耗輔助性封閉式迴路功率控制具體實施 例係用圖1之流程圖及圖2中兩經過簡化之通信站元件予 以闡明。對於底下說明,該傳送功率位準受到控制之通 信站係視為傳送站2 0且接收.功率受到控制之通信之通信 站係視為接收站22。由於路徑損耗輔助性封閉式迴路功 率控制可用於通信中之上傳、下傳或同時上下傳,故傳送 站20可為一基地台、一使用者設備或兩者兼之。 於傳送站2 0,要傳送至接收站之資料係藉由一調變暨 傳播裝置24予以調變並傳播以產生一展頻射頻(RF)信 號。一放大器2 6係用於控制RF信號之功率位準。該RF信 號係藉由一無線通信介面3 8經由一天線3 6或天線陣列予 以輻射至接收站2 2。 RF信號係由接收站2 2之天線4 0或天線陣列予以接收。 接收到之信號脈衝響應係由一通道估計裝置44予以估 計。在一 TDD/CDMA或TD-SCDMA通信系統中,通道估計係 用一通信連 _ 之中置部分(midamble portion of a communication burst)中之已知調整序列予以執行。資料彳貞測裝置4 2藉由 使用該等脈衝響應回復得自接收到之RF信號中之傳送資 料。藉由使用得自資料偵測裝置42及通道估計裝置44兩者 之資訊,得以藉由一品質量測裝置5 0量測所接收之RF信 號之品質,如S】R(步驟60)。一傳送功率命令(TPC)產生裝 置4 6將量測到之品質與一目標品質作比較。若量測到之 品質大於目標,則產生一減少命令。若量測到之品質小 於或等於目標,則產生一增加命令。雖然可用其它命令, M242940 (4) 新_鍊_書贛頁 較佳命令仍為一具有a + 1表示增加功率位準而a - 1表示減 少功率位準之單一位元。TPC係送至傳送站20(步驟62)。 參考資料係藉由一調變暨傳播裝置48予以調變並傳播 以產生一參考RF信號。參考RF信號係藉由天線40或天線 陣列經由無線通信介面3 8輻射至傳送站2 0 (步騾64)。對於 第三代行動通信夥伴合作計畫TDD/CDMA系統或 TD-SCDMA系統之上傳功率控制,較佳之參考通道為主要 一般控制實體通道(P-CCPCH)。 傳送站2 0用其天線3 6或天線陣列接收參考信號。一參考 信號功率量測裝置3 4量測接收到之參考信號功率位準(步 驟6 6)。藉由使用量測到的參考信號功率,一路徑損耗判 斷裝置3 2判斷參考信號之路徑損耗(步驟6 8)。參考信號之 傳送功率位準可由傳送站20所知為先驗(priori)或藉由一 廣播通道(BCH)予以傳訊給傳送站20。路徑損耗係藉由自 所傳送之功率位準減去所接收之功率位準而予以判斷。 T P C係由一 T P C接收暨裁決裝置3 0予以接收且T P C值係 經過判斷。藉由使用所判斷之TPC值,傳送功率位準係藉 由傳送功率控制判斷裝置2 8予以增加或減少(步驟7 0)。增 加或減少值係基於時間上之估計路徑損耗變化(步驟7 2 ) 。放大器2 6之增益係經過調整致使所傳送之RF信號係處 於調整後之功率位準。若路徑損耗之變化大,表示通道狀 況變化大,則傳送功率位準之變化是大的。相反的,若路 徑損耗之變化小,表示通道狀況變化小或沒有變化,則傳 送功率位準之變化是小的。藉由大的傳送功率變化,能夠 快速補償變化快速之通道狀況,如快速衰減通道。小的傳 M242940 (5) 新型說鹌書績頁 送功率變化係用於變化速度慢的通道狀況。 用於判斷第k個功率命令之傳送功率位準,P(k),之其· 中一個方法係依據方程式1。 · P(k) = P(k-l) + TPC_bit * step_size( AL) 方程式 1 P(k-l)係對於第(k-1)個功率命令判斷後之功率位準。 TPC_bit係TPC的值,最好為+ 1或-1。ZXL係由第k個功率命 令對第(k-Ι)個功率命令之路徑損耗估計變化且step_size (Z\L)係一步階大小值,該步階大小值係呈/XL之函數而作 判斷。 一用於判斷AL之方程式為方程式2。 △ L = |L(k) - L(k-l)| L (k)為第k個功率命令之前最接近之路徑損耗估計而l (k -1) 則為第(k-1)個功率命令之前最接近之路徑損耗估計。 或者’為了補償路徑估計因路徑損耗估計之時間與功率 控制傳送之時間之間的時間遲滯所導致的非精確性,路徑 估計’ L(k)及L(k-l)可為經過加權後之路徑損耗估計。估 計出的路損耗及長時間路徑估計,L 〇,係基於一介於下 次傳运時間與路損耗估計時間之間的時間延遲予以加 權。一用於加權之方程式為方程式3。 L(k) =al + (Ua)L〇 方程式 3 L為最接近的路徑損耗估計且α為一加權因子。對於以時 槽為基礎之通信系統,如TDD/CDMA及TD-SCdma,α係基 於路從相耗為估計出之時槽與接收第k個功率命令之後下 一次傳送 < 時槽 < 間的時槽數目,Δτ s,如方程式4所示。 M242940 ⑹ 新書績頁 TS, ' (ATS-l)、 / 方程式4 TSMAX為ATS的最大值,其等於兩連續路徑損耗估計之間 的時槽數目。為了描述,若TSMAX為偶數且下一次傳送之 前最接近的路徑損耗估計為六個時槽,則方程式4之α為 1 / 7。對於以非時槽為基礎之系統,α係由一介於量測路 徑損耗估計與次一傳送之間的時間週期予以判斷。
藉由使用路徑損耗變化,AL .,得以判斷功率位準之步 階大小變化。一用於判斷步階大小之方法為使用一門檻測 試。若路徑損耗變化之絕對值係介於特定門檻之間,則選 擇一指定之步階大小。對於描述使用三步階大小, step_size 1、step_size2 及 step_size3,step_size 1 係在△ L 小於一 第一門植T 1時予以使用。step_size2係在Z\L等於T1或介於
T1與一第二門檻T2之間時予以使用。step_size3係在ZXL大 於或等於T 2時予以使用。或者,亦可用一查詢表聯結各 種聯結Z\L與步階大小。 -11 -
Claims (1)
- M242940 玖、申請專利範圍 1. 一種劃時同步劃碼多重存取(TDD/SCDMA)使用者設備 ,其包含: 一耦接至一天線用於接收一傳送功率命令並判斷一 接收到之傳送功率命令之值之傳送功率命令接收器暨 調整裝置,該傳送功率命令指示一傳送功率增加或減 少; 一用於接收一參考信號並傳送一通信之天線,該參 考信號係以一 TDD/SCDMA格式予以傳送; 一耦接至一天線用於量測一接收到之參考信號功率 位準之參考信號功率量測裝置; 一耦接至該參考信號功率量測裝置之路徑損耗判斷 裝置,該路徑損耗判斷裝置係用於將所量測接收之參 考信號功率位準與一參考信號傳送功率位準相比較, 以產生一參考信號路徑損耗估計; 一耦接至該傳送功率命接收暨裁決裝置及路徑損耗 判斷裝置之傳送功率控制判斷裝置,該傳送功率控制 判斷裝置係用於使用所產生之路徑損耗估計判斷一傳 送功率位準變化大小,並用於以一所判斷之變化量大 小回應傳送功率命令以判斷一傳送功率位準之調整量; 一用於以一 TDD/SCDMA格式產生通信之調變暨傳播 裝置;以及 一耦接至該傳送功率控制判斷裝置之放大器,該放 大器係用於以該傳送功率位準調整量為基礎調整一通 信傳送功率位準。
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US32832701P | 2001-10-09 | 2001-10-09 |
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TW091216061U TW590338U (en) | 2001-10-09 | 2002-10-09 | Time division duplex/code division multiple access base station using pathloss aided closed loop power control |
TW091216058U TW590339U (en) | 2001-10-09 | 2002-10-09 | Time division duplex/code division multiple access user equipment using pathloss aided closed loop power control |
TW091123305A TWI249962B (en) | 2001-10-09 | 2002-10-09 | Pathloss aided closed loop power control |
TW091216060U TW590337U (en) | 2001-10-09 | 2002-10-09 | Time division synchronous code division multiple access base station using pathloss aided closed loop power control |
TW091216059U TWM242940U (en) | 2001-10-09 | 2002-10-09 | Time division synchronous code division multiple access user equipment using pathloss aided closed loop power control |
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TW091216061U TW590338U (en) | 2001-10-09 | 2002-10-09 | Time division duplex/code division multiple access base station using pathloss aided closed loop power control |
TW091216058U TW590339U (en) | 2001-10-09 | 2002-10-09 | Time division duplex/code division multiple access user equipment using pathloss aided closed loop power control |
TW091123305A TWI249962B (en) | 2001-10-09 | 2002-10-09 | Pathloss aided closed loop power control |
TW091216060U TW590337U (en) | 2001-10-09 | 2002-10-09 | Time division synchronous code division multiple access base station using pathloss aided closed loop power control |
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US (1) | US7363049B2 (zh) |
EP (1) | EP1435145A4 (zh) |
KR (12) | KR200299746Y1 (zh) |
CN (3) | CN2646963Y (zh) |
AR (1) | AR036770A1 (zh) |
AU (1) | AU2002332038A1 (zh) |
DE (4) | DE20215546U1 (zh) |
TW (5) | TW590338U (zh) |
WO (1) | WO2003032502A2 (zh) |
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