WO2001039402A1 - Appareil de communication radio et procede permettant de commander la puissance d'emission - Google Patents
Appareil de communication radio et procede permettant de commander la puissance d'emission Download PDFInfo
- Publication number
- WO2001039402A1 WO2001039402A1 PCT/JP2000/008335 JP0008335W WO0139402A1 WO 2001039402 A1 WO2001039402 A1 WO 2001039402A1 JP 0008335 W JP0008335 W JP 0008335W WO 0139402 A1 WO0139402 A1 WO 0139402A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- transmission power
- power control
- value
- error
- reference value
- Prior art date
Links
Classifications
-
- 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
- H04L1/004—Arrangements for detecting or preventing errors in the information received by using forward error control
- H04L1/0045—Arrangements at the receiver end
- H04L1/0047—Decoding adapted to other signal detection operation
- H04L1/005—Iterative decoding, including iteration between signal detection and decoding operation
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
- H03M13/00—Coding, decoding or code conversion, for error detection or error correction; Coding theory basic assumptions; Coding bounds; Error probability evaluation methods; Channel models; Simulation or testing of codes
- H03M13/29—Coding, decoding or code conversion, for error detection or error correction; Coding theory basic assumptions; Coding bounds; Error probability evaluation methods; Channel models; Simulation or testing of codes combining two or more codes or code structures, e.g. product codes, generalised product codes, concatenated codes, inner and outer codes
- H03M13/2957—Turbo codes and decoding
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
- H03M13/00—Coding, decoding or code conversion, for error detection or error correction; Coding theory basic assumptions; Coding bounds; Error probability evaluation methods; Channel models; Simulation or testing of codes
- H03M13/63—Joint error correction and other techniques
- H03M13/6337—Error control coding in combination with channel estimation
-
- 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
- H04L1/20—Arrangements for detecting or preventing errors in the information received using signal quality detector
-
- 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
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
- H03M13/00—Coding, decoding or code conversion, for error detection or error correction; Coding theory basic assumptions; Coding bounds; Error probability evaluation methods; Channel models; Simulation or testing of codes
- H03M13/03—Error detection or forward error correction by redundancy in data representation, i.e. code words containing more digits than the source words
- H03M13/05—Error detection or forward error correction by redundancy in data representation, i.e. code words containing more digits than the source words using block codes, i.e. a predetermined number of check bits joined to a predetermined number of information bits
- H03M13/09—Error detection only, e.g. using cyclic redundancy check [CRC] codes or single parity bit
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
- H03M13/00—Coding, decoding or code conversion, for error detection or error correction; Coding theory basic assumptions; Coding bounds; Error probability evaluation methods; Channel models; Simulation or testing of codes
- H03M13/29—Coding, decoding or code conversion, for error detection or error correction; Coding theory basic assumptions; Coding bounds; Error probability evaluation methods; Channel models; Simulation or testing of codes combining two or more codes or code structures, e.g. product codes, generalised product codes, concatenated codes, inner and outer codes
- H03M13/2957—Turbo codes and decoding
- H03M13/2975—Judging correct decoding, e.g. iteration stopping criteria
Definitions
- the present invention relates to a wireless communication device and a transmission power control method.
- Transmission power control is an important technology for increasing the system capacity in a mobile communication system of the CDMA (Code Division Multiple Access) system.
- One of the transmission power control methods is an outer loop transmission power control method.
- the mobile station apparatus and the base station apparatus maintain a certain level of reception line quality (hereinafter abbreviated as “quality”) such as FER (Frame Error Rate).
- quality such as FER (Frame Error Rate).
- FER Frerame Error Rate
- Interference Ratio (desired wave to interference wave power ratio) is changed, and transmission power control is performed according to the comparison result of the variable reference SIR and the reception SIR. It is necessary for the mobile station device and the base station device to change the reference SIR so that the quality is maintained at a constant level, since transmission with excessive quality causes interference for other stations to increase. This is because it is necessary to transmit with the minimum transmission power that satisfies the required quality.
- FIG. 1 is a main block diagram showing a schematic configuration of a receiving system of a conventional wireless communication device.
- demodulation section 11 performs a predetermined demodulation process on a received signal.
- the decoding unit 12 decodes the demodulated data.
- soft decision Viterbi decoding is generally used for voice communication, and evening decoding is used for data communication.
- the CRC determination unit 13 applies a CRC (Cyclic
- Redundancy Check is performed to determine whether there is an error in the data, and the received data after the determination is output.
- FERR-TARGE AR represents the frame error rate (quality) that the wireless communication device wants to maintain at a certain level.
- the criterion SIR updating section 15 is based on the criterion determined by the above equation (1) or (2).
- the reference SIR value is updated by adding the SIR increase / decrease value and the current reference SIR value.
- the update period is 1 O ms.
- the updated reference SIR value is output to comparison section 17.
- the comparison unit 17 compares the SIR value of the received signal measured by the 311 measurement unit 16 with the updated reference SI IU, and outputs the comparison result to the transmission power control bit generation unit 18 I do.
- the transmission power control bit generator 18 transmits the measured S
- the transmission power control bit generator 1 When the R value is larger than the reference SIR value, a transmission power control bit for instructing the communication partner to decrease the transmission power is generated.
- the transmission power control bit generator 1 When the R value is larger than the reference SIR value, a transmission power control bit for instructing the communication partner to decrease the transmission power is generated.
- the transmission power control bit generation unit 18 generates the generated transmission power control bit. Is output to the transmission system of the wireless communication device. In the transmission system, a transmission power control bit is mapped to a transmission signal. The communication partner adjusts the transmission power according to the received transmission power control bit. As described above, conventionally, outer loop transmission power control has been performed between wireless communication apparatuses.
- turbo decoding used for data communication
- the decoding reliability of the decoded bits is compared with the data sequence decoded by the soft output video algorithm (SOVA) or the maximum posterior probability decoding (MAP). The degree is added. Then, the same decoding is repeatedly performed on the data sequence to which the decoding reliability is added, so that the decoding accuracy is improved.
- the number of repetitions in turbo decoding is generally called the number of iterations. The number of iterations is generally set at eight.
- the transmission power at which no error is detected for the first time at the eighth iteration is the optimal transmission power for increasing the system capacity.
- transmission data of excessive quality transmitted with excessive transmission power such that errors are not detected when the number of iterations is 7 or less increases interference with other stations, and the system capacity is reduced. Will decrease.
- the reduction value S2 of the reference SIR is fixedly calculated according to the above equation (2). Specifically, the reduction value S2 of the reference SIR is
- the conventional wireless communication device if the quality of the received data once becomes excessive, it takes a very long time until the reference SIR value is set to the optimum reference SIR value. In other words, in the conventional wireless communication device, the time for transmitting data with excessive transmission power becomes extremely long, so that interference with other stations increases and the system capacity decreases. Disclosure of the invention
- An object of the present invention is to provide a wireless communication apparatus and a transmission power control method that can prevent a decrease in system capacity caused by excessive transmission power.
- the present inventors focused on the relationship between the reception line quality and the number of turbo decoding repetitions (the number of iterations), found that the state of the reception line quality could be determined by the number of iterations, and made the present invention. Reached.
- the reference SIR value is changed by adaptively changing the range of increase or decrease of the reference SIR value in accordance with the number of times of iteration until no error is detected.
- the time required to set the optimal reference SIR value has been shortened.
- FIG. 1 is a main block diagram showing a schematic configuration of a receiving system of a conventional wireless communication device.
- FIG. 2 is a main block diagram showing a schematic configuration of a receiving system of the wireless communication device according to one embodiment of the present invention.
- FIG. 3 illustrates the operation of the receiving system of the wireless communication apparatus according to one embodiment of the present invention.
- FIG. 4 is a flowchart for performing the operation.
- FIG. 4 is a graph for explaining F ER characteristics at the time of turbo decoding.
- FIG. 5 is a graph showing a change in reference SIR when performing outer-amplifier transmission power control using the wireless communication device according to one embodiment of the present invention.
- FIG. 1 is a main block diagram showing a schematic configuration of a receiving system of a wireless communication apparatus according to one embodiment of the present invention.
- a demodulation unit 101 performs a predetermined demodulation process on a received signal.
- E-BO decoding unit 102 performs turbo decoding on the demodulated data.
- the turbo decoding unit 102 determines whether or not there is no error according to the result of the determination by the CRC determination unit 104 described later, or a predetermined maximum number of data in accordance with the result of counting by the counting unit 103 described later. Perform turbo decoding up to the number of times.
- the counter 103 has a predetermined maximum number of iterations set in advance.
- the maximum number of iterations is normally set to eight.
- the counting section 103 is for counting the number of turbo decoding iterations.
- the determination unit 104 performs CRC on the decoded data, determines whether there is an error in the data, and outputs the received data after the determination.
- the increase / decrease value calculation unit 105 calculates the increase / decrease value of the reference SIR according to the number of iterations executed by the turbo decoding unit 102.
- the reference SIR updating unit 106 holds the current reference SIR value.
- the reference SIR updating unit 106 obtains a new reference SIR value by adding the increase / decrease value of the reference SI determined by the increase / decrease value calculation unit 105 and the current reference SIR value. Then, the reference SIR update unit 106 updates the current reference SIR value with the new reference SIR value, and outputs the updated reference SIR value to the comparison unit 108. I do.
- the comparison unit 108 compares the SIR value of the received signal measured by the SIR measurement unit 107 with the updated reference SIR value, and sends the comparison result to the transmission power control bit generation unit 109. Output.
- transmission power control bit generation section 109 When the measured SIR value is larger than the reference SIR value, transmission power control bit generation section 109 generates a transmission power control bit instructing the other party to decrease the transmission power.
- transmission power control bit generation section 109 When the measured SIR value is equal to or smaller than the reference SIR value, transmission power control bit generation section 109 generates a transmission power control bit for instructing a communication partner to increase transmission power.
- transmission power control bit generation section 109 outputs the generated transmission power control bit to the transmission system of the wireless communication device.
- the transmission power control bit is mapped to the transmission signal.
- the communication partner adjusts the transmission power according to the received transmission power control bit. In this way, outer loop transmission power control is performed between the wireless communication devices.
- FIG. 3 is a flowchart for explaining the operation of the receiving system of the wireless communication device according to one embodiment of the present invention.
- step (hereinafter abbreviated as “ST”) 201 the turbo decoding unit 102, the counting unit 10 Reset the number of iterations I held in 3 to “0”.
- the number of iterations is indicated by “I”
- the predetermined maximum number of iterations set in the counting section 103 is indicated by “N”. It is also assumed that the maximum number of iterations is set to “8”.
- the counting unit 103 compares the number of iterations I with the maximum number of iterations N. If I ⁇ N, counting section 1 0 3 Instructs the turbo decoding unit 102 to perform the first decoding. In this case, proceed to ST204.
- turbo decoding section 102 performs the first decoding on the received data, and outputs the decoded data to CRC determining section 104.
- the increase / decrease value calculating unit 105 refers to the number of iterations I held in the counting unit 103. Then, the increase / decrease value calculation unit 105 generates the reference SIR decrease value S2 according to the following equations (4) and (5), and uses the generated reference SIR decrease value S2 as the reference SIR update unit 1 0 Output to 6.
- coeff (I) is a coefficient that is inversely proportional to the number of iterations I.
- F ER—TARGE T indicates the frame error rate (quality) that the wireless communication device wants to maintain at a certain level.
- FER TAR GET indicates 10 ⁇ :: for voice communication. Set to It is set to 10 in the case of data communication. That is, the above equation (5) is an equation obtained by multiplying the conventional equation (2) for calculating the reduction value of the reference SIR by c 0 eff (I).
- the above equation (5) indicates that the smaller the number of iterations I, the larger the decrease value of the reference SIR. In other words, the better the quality of the received data, the larger the decrease value of the reference SIR. Therefore, once the quality of the received data becomes excessive, the decrease value of the reference SIR increases in proportion to the excess, and until the reference SIR value is set to the optimal reference SIR value. The time is greatly reduced compared to conventional wireless communication devices.
- the counting unit 103 performs decoding processing on the turbo decoding unit 102. Instruct to end. Thereby, turbo decoding section 102 ends the decoding process. Further, the counting section 103 outputs a signal indicating that I exceeds N to the increase / decrease value calculating section 105. In accordance with this signal, the increase / decrease value calculation section 105 generates an increase value S1 of the reference SIR in ST207 according to the above equation (4), and uses the increase value of the generated reference SIR as a reference SIR update section. Output to 106. In other words, if the quality of the received data is poor and the CRC result is incorrect even if turbo decoding is repeated eight times for the received data, the reference SIR value is increased by 0.5 [dB].
- the above equations (4) and (5) used in the present embodiment are merely examples, and the present invention is not limited to these. Therefore, the above equation (4) may be any equation as long as it is an equation representing the increase value of the reference SIR. In addition, the above equation (5) may be any equation that indicates that the smaller the number of iterations I is, the larger the decrease value of the reference SIR is.
- FIG. 4 is a graph for explaining FER characteristics at the time of turbo decoding.
- FIG. 5 is a graph showing a change in reference SIR when outer loop transmission power control is performed using the wireless communication device according to one embodiment of the present invention.
- the F ER characteristic at the time of turbo decoding will be described with reference to FIG.
- the horizontal axis shows E b / ⁇ ⁇ (ratio of received energy per bit of user information to noise density), and the vertical axis shows FER.
- the number of turbo decoding iterations is 1
- the FER characteristics for 1, 2, 4 and 8 times are shown.
- the horizontal axis represents time
- the vertical axis represents the reference SIR value.
- the solid line shows the change in the reference SIR when the outer loop transmission power control is performed using the wireless communication device according to the present embodiment
- the dashed line shows the outer loop transmission power using the conventional wireless communication device.
- the SIR value is used as the reference value and the measured value, but the present invention is not limited to this. That is, any value may be used as the reference value and the measured value as long as the value indicates the reception quality, such as the reception level.
- the reference SIR value decrease width is adaptively changed according to the number of iterations until the data error is no longer detected. It is possible to shorten the time until it is set to. Therefore, the time during which data is transmitted with excessive transmission power can be reduced.
- the wireless communication device can be applied to a communication terminal device or a base station device in a mobile communication system.
- a communication terminal device or a base station device When applied, when data is transmitted with excessive transmission power in communication terminal equipment or base station equipment Since the time can be reduced, it is possible to prevent the system capacity of the mobile communication system from decreasing.
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- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Physics & Mathematics (AREA)
- Probability & Statistics with Applications (AREA)
- Theoretical Computer Science (AREA)
- Quality & Reliability (AREA)
- Detection And Prevention Of Errors In Transmission (AREA)
- Mobile Radio Communication Systems (AREA)
- Transmitters (AREA)
Description
Claims
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US09/889,963 US6771978B1 (en) | 1999-11-25 | 2000-11-27 | Radio communication apparatus and method for controlling transmission power |
EP20000977948 EP1146667B1 (en) | 1999-11-25 | 2000-11-27 | Radio communication apparatus and method for controlling transmission power |
AU15522/01A AU1552201A (en) | 1999-11-25 | 2000-11-27 | Radio communication apparatus and method for controlling transmission power |
DE2000604783 DE60004783T2 (de) | 1999-11-25 | 2000-11-27 | Funkkommunikationsgerät und verfahren zur steuerung der übertragungstärke |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP11/333660 | 1999-11-25 | ||
JP33366099A JP3535427B2 (ja) | 1999-11-25 | 1999-11-25 | 無線通信装置 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2001039402A1 true WO2001039402A1 (fr) | 2001-05-31 |
Family
ID=18268552
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2000/008335 WO2001039402A1 (fr) | 1999-11-25 | 2000-11-27 | Appareil de communication radio et procede permettant de commander la puissance d'emission |
Country Status (6)
Country | Link |
---|---|
US (1) | US6771978B1 (ja) |
EP (1) | EP1146667B1 (ja) |
JP (1) | JP3535427B2 (ja) |
AU (1) | AU1552201A (ja) |
DE (1) | DE60004783T2 (ja) |
WO (1) | WO2001039402A1 (ja) |
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FR2827444A1 (fr) * | 2001-07-13 | 2003-01-17 | France Telecom | Recepteur radiotelephonique de type umts |
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JP3723417B2 (ja) * | 2000-06-29 | 2005-12-07 | 株式会社エヌ・ティ・ティ・ドコモ | 送信電力制御方法および移動通信システム |
JP3514217B2 (ja) * | 2000-06-29 | 2004-03-31 | 日本電気株式会社 | ターボ復号方法及び受信機 |
JP2002190745A (ja) * | 2000-12-22 | 2002-07-05 | Nec Corp | 繰り返し回数更新装置及び方法 |
FI20002857A0 (fi) * | 2000-12-27 | 2000-12-27 | Nokia Networks Oy | Menetelmä ja järjestely tehonsäädön toteuttamiseksi |
US7082317B2 (en) * | 2002-04-05 | 2006-07-25 | Fujitsu Limited | Communication apparatus and outer-loop power control method |
CN1656725A (zh) * | 2002-05-28 | 2005-08-17 | 皇家飞利浦电子股份有限公司 | 由接收器对出错帧进行校正的方法 |
US7133689B2 (en) | 2002-09-12 | 2006-11-07 | Interdigital Technology Corporation | Method and system for adjusting downlink outer loop power to control target SIR |
JP2004208008A (ja) * | 2002-12-25 | 2004-07-22 | Toshiba Corp | 電子機器、無線通信装置および送出電力制御方法 |
WO2004068743A1 (ja) * | 2003-01-31 | 2004-08-12 | Nec Corporation | 送信電力制御のための目標値制御方法、及びそれに用いる基地局制御装置並びに移動局 |
US6907025B2 (en) * | 2003-06-06 | 2005-06-14 | Interdigital Technology Corporation | Adjusting the amplitude and phase characteristics of transmitter generated wireless communication signals in response to base station transmit power control signals and known transmitter amplifier characteristics |
US8018902B2 (en) * | 2003-06-06 | 2011-09-13 | Telefonaktiebolaget L M Ericsson (Publ) | Methods and apparatus for channel quality indicator determination |
KR100519666B1 (ko) * | 2003-06-12 | 2005-10-07 | 에스케이 텔레콤주식회사 | 이동통신 시스템에서의 패킷데이터 서비스를 위한전력할당장치 및 방법 |
US7197327B2 (en) | 2004-03-10 | 2007-03-27 | Interdigital Technology Corporation | Adjustment of target signal-to-interference in outer loop power control for wireless communication systems |
JP4543876B2 (ja) * | 2004-10-20 | 2010-09-15 | 日本電気株式会社 | 移動通信システム及び通信方法並びにそれに用いる移動局、基地局 |
RU2388147C2 (ru) * | 2005-02-01 | 2010-04-27 | Телефонактиеболагет Лм Эрикссон (Пабл) | Внешний контур управления мощностью передачи для f-dpch |
EP1906560A4 (en) | 2005-07-19 | 2012-01-04 | Nec Corp | TURBO DECODING SYSTEM, TRANSMITTER PROCEDURE AND CDMA MOBILE COMMUNICATION DEVICE |
US7609791B2 (en) * | 2006-04-21 | 2009-10-27 | Telefonaktiebolaget L M Ericsson (Publ) | Iterative decoding with intentional SNR/SIR reduction |
JP2008193536A (ja) * | 2007-02-07 | 2008-08-21 | Nec Corp | 移動通信システム、無線基地局装置及びそれらに用いる電力制御方法 |
EP2166689A4 (en) * | 2007-07-04 | 2013-11-20 | Nec Corp | MULTI-CARRIER MOBILE COMMUNICATION SYSTEM |
JP5392249B2 (ja) * | 2008-03-26 | 2014-01-22 | 日本電気株式会社 | 無線局装置、無線リソースの制御方法、無線局制御プログラム、及び無線通信システム |
CN101965740B (zh) * | 2008-03-31 | 2013-09-04 | 日本电气株式会社 | 无线电台站设备、无线电资源控制方法、存储无线电台站控制程序的记录介质以及无线电通信系统 |
GB2463074B (en) * | 2008-09-02 | 2010-12-22 | Ip Access Ltd | Communication unit and method for selective frequency synchronisation in a cellular communication network |
US20160127037A1 (en) * | 2013-05-23 | 2016-05-05 | Telefonaktiebolaget L M Ericsson (Publ) | Method And Apparatus For Determining Transmission Quality |
US10506557B2 (en) | 2015-03-05 | 2019-12-10 | Telefonaktiebolaget Lm Ericsson (Publ) | Decoding margin based configuration of transmission properties |
MX366604B (es) * | 2015-03-05 | 2019-07-16 | Ericsson Telefon Ab L M | Margen de decodificacion que define ack de multiples niveles. |
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CN112631413B (zh) * | 2020-12-07 | 2022-02-08 | 合肥联宝信息技术有限公司 | 一种功率调节方法及装置 |
CN113904741A (zh) * | 2021-10-08 | 2022-01-07 | 天津津航计算技术研究所 | 一种基于校验辅助的信噪比强弱动态判定方法 |
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-
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- 2000-11-27 AU AU15522/01A patent/AU1552201A/en not_active Abandoned
- 2000-11-27 WO PCT/JP2000/008335 patent/WO2001039402A1/ja active IP Right Grant
- 2000-11-27 DE DE2000604783 patent/DE60004783T2/de not_active Expired - Fee Related
- 2000-11-27 US US09/889,963 patent/US6771978B1/en not_active Expired - Fee Related
- 2000-11-27 EP EP20000977948 patent/EP1146667B1/en not_active Expired - Lifetime
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Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2827444A1 (fr) * | 2001-07-13 | 2003-01-17 | France Telecom | Recepteur radiotelephonique de type umts |
US9085648B2 (en) | 2008-10-08 | 2015-07-21 | Evonik Degussa Gmbh | Superabsorbent polymer process |
Also Published As
Publication number | Publication date |
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JP2001156711A (ja) | 2001-06-08 |
EP1146667B1 (en) | 2003-08-27 |
US6771978B1 (en) | 2004-08-03 |
JP3535427B2 (ja) | 2004-06-07 |
EP1146667A4 (en) | 2002-08-21 |
DE60004783T2 (de) | 2004-02-26 |
EP1146667A1 (en) | 2001-10-17 |
DE60004783D1 (de) | 2003-10-02 |
AU1552201A (en) | 2001-06-04 |
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