WO2004068883A1 - 無線通信システム、基地局装置及びそれに用いる下り送信指向特性制御方法 - Google Patents
無線通信システム、基地局装置及びそれに用いる下り送信指向特性制御方法 Download PDFInfo
- Publication number
- WO2004068883A1 WO2004068883A1 PCT/JP2004/000307 JP2004000307W WO2004068883A1 WO 2004068883 A1 WO2004068883 A1 WO 2004068883A1 JP 2004000307 W JP2004000307 W JP 2004000307W WO 2004068883 A1 WO2004068883 A1 WO 2004068883A1
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- WO
- WIPO (PCT)
- Prior art keywords
- area
- base station
- control
- downlink
- bit rate
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Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W28/00—Network traffic management; Network resource management
- H04W28/16—Central resource management; Negotiation of resources or communication parameters, e.g. negotiating bandwidth or QoS [Quality of Service]
- H04W28/18—Negotiating wireless communication parameters
- H04W28/22—Negotiating communication rate
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W16/00—Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures
- H04W16/02—Resource partitioning among network components, e.g. reuse partitioning
- H04W16/04—Traffic adaptive resource partitioning
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W16/00—Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures
- H04W16/24—Cell structures
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W28/00—Network traffic management; Network resource management
- H04W28/02—Traffic management, e.g. flow control or congestion control
- H04W28/10—Flow control between communication endpoints
Definitions
- the present invention relates to a radio communication system, a base station apparatus, and a downlink transmission directivity control method used therefor.
- the present invention relates to a radio communication system, a base station apparatus, a method for controlling downlink transmission directivity used therefor, and a program therefor.
- the wireless communication system based on the CDMA system is a communication system characterized by reducing the interference between communication terminals by assigning a code having orthogonal characteristics to each communication terminal and multiplying the communication signal.
- it is standard to support not only voice but also data communication such as buckets.
- the adaptive antenna base station apparatus in the above-described conventional mobile communication system includes a base station control unit 1, a base-span processing unit 8, radio transmission / reception units 31 to 3n, and transmission / reception antennas. 4 l to 4 n.
- the base station controller 1 transmits and receives antennas 4 :! Connected to each component of the base station apparatus except for the base stations (excluding the baseband processing unit 8 and the wireless transmission / reception units 31 to 3n, components not shown for processing voice and data, etc.) It has a function to communicate control and monitoring data and to interface with a higher-level station device (not shown).
- the base band processing unit 8 is connected to the transmitting / receiving antennas 4 l to 4 n via the respective wireless transmitting / receiving units 31 to 3 n, and communicates with a communication terminal (not shown) through the transmitting / receiving antennas 41 to 4 n.
- Encoding and decoding It has a function to perform encryption processing. That is, the baseband processing unit 8 includes an encoding processing unit 81 that performs an encoding operation of transmission data, a decoding processing unit 82 that performs a decoding operation of reception data, and a directivity control of an adaptive antenna. An amplitude / phase control unit 83 for performing amplitude and phase calculation processing of communication data.
- Each of the radio transmission / reception units 31 to 3 n is connected to one of the corresponding transmission / reception antennas 4 l to 4 n, converts the data from the baseband processing unit 8 into a radio frequency band, and transmits / receives the data. It has a function of converting a signal in a radio frequency band transmitted from ⁇ 4n or received from the transmitting / receiving antennas 4l to 4n into a baseband band and outputting it to the baseband processing unit 8.
- a configuration is considered in which the downlink directivity is controlled from the uplink communication error rate and received power, or the downlink error rate reported from the communication terminal (for example, "W-CDMA mobile communication system, Chapter 2 Wireless transmission system", supervised by Keiji Tachikawa, published by Maruzen Co., Ltd., June 25, 2001, pp. 79-86).
- W-CDMA mobile communication system Chapter 2 Wireless transmission system
- a method has been proposed in which the interference characteristics from a high-power high-speed transmission user to a low-speed transmission user are improved by controlling the array antenna directivity on the downlink of the CDMA system (for example, see Japanese Patent Application Laid-Open No. 2002-22-2). Publication No. 46970, p. 5-9, FIG. 1).
- the radio wave arrival direction estimating means estimates the direction of the mobile station, and the individual transmission power determining means
- the transmission power is determined from the data transmission rate determined by the data transmission rate determining means for the mobile station.
- the side lobe level setting means determines the side lobe level suppression value for the main lobe from the data transmission rate ratio between the high speed transmission and the low speed transmission or the ratio of the spectrum spreading factor, and the null setting means suppresses the interference near the main lobe.
- the transmission directivity pattern forming means determines the transmission pattern.
- the propagation conditions between the base station and the communication terminal are constantly changing due to the characteristics of the wireless communication, so that the perfect orthogonal characteristics are stably maintained between the communication channels. It is difficult to do so, and communication to other communication terminals may actually cause interference. Therefore, in a CDMA wireless communication system, how to reduce such interference greatly affects the increase or decrease in the communication capacity of the system.
- the The spreading factor of the orthogonal code is changed according to the transmission rate, and code multiplexing is performed with the spreading factor of the communication terminal communicating at a higher bit rate lowered. Therefore, in a conventional wireless communication system, the effect (interference) of one high-speed communication bit rate communication terminal on the system is greater than that of a low-speed voice terminal.
- an object of the present invention is to solve the above-mentioned problems and to minimize the influence of downlink interference in the same sector by a high communication rate terminal, a radio communication system, a base station apparatus, and a downlink transmission direction used therefor.
- An object of the present invention is to provide a characteristic control method and a program thereof.
- a wireless communication system performs wireless communication with a base station apparatus having an antenna capable of controlling directivity and the base station apparatus within a service area of the base station apparatus.
- a radio communication system comprising: a communication terminal; and a means for calculating, in a base station apparatus, a cumulative value of a downlink communication bit rate for each of a plurality of sector areas formed by dividing a cell indicating a service area of the base station apparatus. And control means for performing area control based on the calculated cumulative value of the downlink communication bit rates so that the downlink communication pit rate per sector area becomes substantially uniform.
- the base station apparatus calculates an antenna capable of controlling directivity and a cumulative value of a downlink communication pit rate for each of a plurality of sector areas formed by dividing a cell indicating a service area of the own apparatus. Means, and control means for performing area control based on the calculated cumulative value of the downlink communication bit rates so that the downlink communication bit rate per sector area becomes substantially uniform.
- a downlink transmission directivity control method is a downlink transmission directivity control method for a base station apparatus including an antenna capable of controlling directivity, wherein: Calculating a cumulative value of a downlink communication bit rate for each of a plurality of sector areas formed by dividing a cell indicating a service area of the base station apparatus; and, based on the calculated cumulative value of the downlink communication bit rate. Performing area control so that the downlink communication bit rate per sector area is substantially uniform.
- the program of the downlink transmission directivity control method according to the present invention is a program of a downlink transmission directivity control method for a base station device provided with an antenna capable of controlling directivity, wherein the computer has a service area of the base station device. Calculating the cumulative value of the downlink communication bit rate for each of a plurality of sector areas formed by dividing the cell indicating the downlink, and the downlink communication bit per sector area based on the calculated cumulative value of the downlink communication bit rate. And performing a process of performing area control so that the rate is substantially uniform.
- FIG. 1 is a block diagram showing a configuration of a base station apparatus according to one embodiment of the present invention.
- FIG. 2 is a flowchart showing a transmission operation of the base station apparatus according to one embodiment of the present invention.
- FIG. 3 is a flowchart showing directivity control by the amplitude / phase control unit in FIG.
- FIG. 4 is a flowchart showing a receiving operation of the base station apparatus according to one embodiment of the present invention.
- FIG. 5 is a schematic diagram showing an initial state of a cell to be saboted in the base station apparatus according to one embodiment of the present invention.
- FIG. 6 is a schematic diagram showing a state of a cell after being controlled by the base station apparatus according to one embodiment of the present invention.
- FIG. 7 is a flowchart showing directivity control according to another embodiment of the present invention.
- FIG. 8 is a block diagram showing a configuration of a conventional base station apparatus. BEST MODE FOR CARRYING OUT THE INVENTION
- FIG. 1 shows an embodiment of the present invention.
- FIG. 3 is a block diagram illustrating a configuration of a base station device according to an embodiment.
- a base station apparatus according to one embodiment of the present invention is used in a radio communication system, in particular, a mobile communication system using a CDMA (Code Division Multiple Access) scheme, and is used in a sector (base An adaptive antenna base station apparatus that performs downlink transmission directivity control in accordance with a communication bit rate for each of the cells indicating a service area of a station.
- CDMA Code Division Multiple Access
- the base station apparatus is based on the above-described background, in particular that interference in downlink communication (communication from a base station to a terminal) in a wireless communication system based on the CDMA system affects system capacity. Focusing attention, area control is performed so that the downstream communication pit rate per area is as uniform as possible.
- the above-mentioned area indicates a service area obtained by dividing a cell.
- the divided service area is referred to as a sector area.
- the base station apparatus includes a base station control unit 1, a baseband processing unit 2, wireless transmission / reception units 3l to 3n, and transmission / reception antennas 4l to 4n. .
- the number of components having the same name does not mean the number of components that are indispensable for implementing the present embodiment, but is shown as an example for explanation.
- the base station control unit 1 includes the components of the base station apparatus except the transmission / reception antennas 4 l to 4 n (the base band processing unit 2 and the radio transmission / reception units 3 l to 3 n, which perform voice and data processing, etc. It has a function to communicate control and monitoring data and to interface with a higher-level station device (not shown).
- the baseband processing unit 2 is connected to transmission / reception antennas 4 l to 4 n via the respective radio transmission / reception units 31 to 3 n, and performs coding processing and decoding of communication data transmitted / received to / from a communication terminal through the antenna. It has a function to perform processing.
- the base-span processing unit 2 includes an encoding processing unit 21 that performs an encoding operation of transmission data, a decoding processing unit 22 that performs a decoding operation of reception data, and a directivity control of an adaptive antenna.
- An amplitude / phase control unit 23 that performs the amplitude and phase calculation processing of the communication data, a communication bit rate calculation unit 24 that calculates the communication rate of the communication data, and a program (a computer (Executable program).
- Each of the wireless transmission / reception units 31 to 3n is connected to one of the corresponding transmission / reception antennas 41 to 4n.
- the data from the baseband processing unit 2 is converted into a radio frequency band and transmitted from the transmission / reception antennas 4 l to 4 n, or a signal in the radio frequency band received from the transmission / reception antennas 4 l to 4 n is used as a base. It has a function to convert to band band and output to base band processing unit 2.
- FIG. 2 is a flowchart showing a transmission operation of the base station apparatus according to one embodiment of the present invention.
- FIG. 3 is a flowchart showing directivity control by the amplitude / phase control unit 23 of FIG. 1
- FIG. 6 is a flowchart showing a receiving operation of the base station apparatus according to one embodiment of the present invention. The operation of the base station apparatus according to one embodiment of the present invention will be described with reference to FIGS.
- Downlink communication data transmitted from the base station apparatus to the communication terminal (mobile station) (not shown) is input from the higher station apparatus to the base station apparatus.
- the communication data input from the upper station device is received by the base station controller 1 (step S 1 in FIG. 2) and passed to the baseband processor 2.
- the coding processing unit 21 performs coding processing such as conversion of the communication data into the radio interface format and error correction (step S2 in FIG. 2).
- the amplitude / phase control unit 23 controls the amplitude / phase components of the coded communication data so that a desired directivity is formed when the coded communication data is transmitted from the transmission / reception antennas 4 l to 4 n (FIG. 2).
- step S3) transmission data for each of the transmitting and receiving antennas 4l to 4n is generated (step S4 in FIG. 2).
- the output data of the amplitude / phase control unit 23 is sent to the radio transmission / reception units 3 l to 3 n corresponding to the transmission / reception antennas 4 l to 4 n (step S 5 in FIG. 2), and the radio transmission / reception units 31 to 3 n performs frequency conversion to high frequency band, radio modulation, filtering, amplification, etc.
- Step S6 in FIG. 2 and transmitted from the transmitting / receiving antennas 41 to 4n (Step S7 in FIG. 2).
- the pit rate calculation section 24 calculates the cumulative bit rate of the downlink communication data in which the base station is communicating with the communication terminal, and totals the data for each sector area (step 11 in FIG. 3).
- the amplitude / phase control unit 23 checks whether the cumulative bit rate for each sector area reported from the bit rate calculation unit 24 is higher than a preset first threshold value (FIG. 3, step S12). ). If the cumulative bit rate is higher than the first threshold, the amplitude / phase control unit 23 sets the area range of the sector area in advance. The directional characteristics are controlled so as to be smaller than the set standard area (step S13 in FIG. 3).
- the amplitude / phase control section 23 sets the cumulative bit rate for each sector area reported from the bit rate calculating section 24 in advance. It is checked whether it is lower than the second threshold value (step S14 in FIG. 3). When the cumulative bit rate is lower than the second threshold value, the amplitude / phase control section 23 controls the directional characteristics so that the area range of the sector area is wider than the standard area range (step S15 in FIG. 3).
- the “standard area range” for the size of the sector area indicates a sector area area when the communication bit rates of the sector areas are equal to each other.
- the uplink communication data received from the communication terminal to the base station is transmitted / received by the transmission / reception antennas 41 to 4n. It is sent to the sections 3l to 3n (FIG. 4, step S21).
- Each of the wireless transmission / reception units 31 to 3n performs low-noise amplification, wireless demodulation, filtering, frequency conversion to the baseband, etc. on the uplink communication data, and outputs the data to the baseband processing unit 2 (Fig. 4 Step S22).
- the baseband processing unit 2 performs an error correction process on the communication data and a conversion from the wireless interface format to the priority channel format for the uplink communication data in the decoding processing unit 22 (FIG. 4). Step S23) is transmitted to the upper station apparatus via the base station controller 1 (FIG. 4, step S24).
- the baseband processing unit 2 receives the uplink reception signals from the radio transmission / reception units 31 to 3n, the baseband processing unit 2 processes the signals in the decoding processing unit 22 via the amplitude / phase control unit 23, similarly to the downlink signals. It is also possible. However, in any case, there is no effect on the gist of the present embodiment, and thus the transmission path of the uplink data is not particularly limited.
- FIG. 5 is a schematic diagram showing an initial state of a cell (area) supported by the base station device according to one embodiment of the present invention
- FIG. 6 is a diagram after control by the base station device according to one embodiment of the present invention. It is a schematic diagram which shows the state of a cell (area). With reference to FIGS. 5 and 6, how the directivity of each sector area is changed by the base station apparatus according to one embodiment of the present invention will be described.
- FIG. 5 schematically shows an area (initial state) serviced by the base station apparatus according to one embodiment of the present invention.
- Reference numeral 5 denotes a base station apparatus according to an embodiment of the present invention
- area 6 denotes a cell served by the base station apparatus according to an embodiment of the present invention
- areas 61 to 63 denote sector areas in the cell 6, respectively.
- the cell 6 includes three sector areas 61 to 63.
- FIG. 5 shows a situation where communication terminals are arranged in each of the sector areas 61 to 63.
- low bit rate communication for example, voice communication
- high bit rate communication for example, video distribution
- the pit rate calculation unit 24 calculates the total of the downlink communication bit rates of each sector area 6;! To 63, and as a result, the sector area 62 (where high pit rate terminals 71 and 72 exist) is the most. The output is high, followed by the output of sector area 63 (high bit rate terminal 73 is present) and sector area 61 (low bit rate terminal 70 is present).
- the total downlink communication bit rate for each sector area is calculated, and the downlink directivity is controlled in accordance with the result.
- Directivity control can be performed so as to average the total downlink communication bit rate in each sector area, thus smoothing fluctuations in the number of communication terminals that can be accommodated in cells served by the base station equipment. can do.
- the control based on information closed inside the base station can be performed instead of the control based on the report information (feed pack) from the communication terminal as in the conventional technology. It can be realized without depending on the last function.
- FIG. 7 is a flowchart showing directivity control according to another embodiment of the present invention. Since the configuration of the base station apparatus according to another embodiment of the present invention is the same as that of the base station apparatus according to one embodiment of the present invention shown in FIG. 1, this embodiment will be described with reference to FIGS. A description will be given of directional characteristic control according to another embodiment of the present invention.
- the pit rate calculator 24 calculates the total pit rate of the downlink communication data in which the base station is communicating with the communication terminal, and totals the data for each sector area (FIG. 7, step S31).
- the amplitude / phase controller 23 calculates the ratio of the cumulative pit rate for each sector area reported from the bit rate calculator 24 (step S32 in FIG. 7). When the ratio of the cumulative bit rate is calculated, the amplitude / phase control unit 23 controls the directivity so that the ratio of the area range of each sector area is inversely proportional to the ratio of the cumulative bit rate of each sector area ( Figure 7 Step S33).
- the downlink cumulative communication bit rate for each sector area is calculated, and the downlink directivity characteristic is calculated so that the ratio of the area range of each sector area is inversely proportional to the ratio of the cumulative bit rate of each sector area.
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Abstract
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Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
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EP04702827A EP1596618A4 (en) | 2003-01-29 | 2004-01-16 | RADIO COMMUNICATION SYSTEM, BASE STATION APPARATUS, AND METHOD FOR CONTROLLING DOWNSTREAM TRANSMISSION ORIENTATION CHARACTERISTICS USED THEREFOR |
JP2005504669A JP4434141B2 (ja) | 2003-01-29 | 2004-01-16 | 無線通信システム、基地局装置及びそれに用いる下り送信指向特性制御方法 |
US10/543,500 US7454168B2 (en) | 2003-01-29 | 2004-01-16 | Radio communication system, base station apparatus, and downlink transmission directing characteristic method used therefor |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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JP2003019606 | 2003-01-29 | ||
JP2003-019606 | 2003-01-29 |
Publications (1)
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WO2004068883A1 true WO2004068883A1 (ja) | 2004-08-12 |
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PCT/JP2004/000307 WO2004068883A1 (ja) | 2003-01-29 | 2004-01-16 | 無線通信システム、基地局装置及びそれに用いる下り送信指向特性制御方法 |
Country Status (6)
Country | Link |
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US (1) | US7454168B2 (ja) |
EP (1) | EP1596618A4 (ja) |
JP (1) | JP4434141B2 (ja) |
KR (1) | KR100715753B1 (ja) |
CN (1) | CN1745598A (ja) |
WO (1) | WO2004068883A1 (ja) |
Families Citing this family (2)
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KR100725773B1 (ko) * | 2004-08-20 | 2007-06-08 | 삼성전자주식회사 | 시분할 듀플렉스 방식의 이동통신 시스템에서 단말기의상태에 따라 상향링크 전력제어방식을 적응적으로변경하기 위한 장치 및 방법 |
US8400356B2 (en) * | 2006-12-27 | 2013-03-19 | Lockheed Martin Corp. | Directive spatial interference beam control |
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WO2001047146A1 (en) * | 1999-12-20 | 2001-06-28 | Telefonaktiebolaget Lm Ericsson (Publ) | Radio network control using uplink mobile transmit power |
JP2002521937A (ja) * | 1998-07-20 | 2002-07-16 | モトローラ・インコーポレイテッド | 資源割当方法および割当システム |
JP2002345048A (ja) * | 2001-04-30 | 2002-11-29 | Docomo Communications Laboratories Usa Inc | 伝送制御方法 |
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US5276907A (en) * | 1991-01-07 | 1994-01-04 | Motorola Inc. | Method and apparatus for dynamic distribution of a communication channel load in a cellular radio communication system |
US5889494A (en) * | 1997-01-27 | 1999-03-30 | Metawave Communications Corporation | Antenna deployment sector cell shaping system and method |
US6236866B1 (en) * | 1998-05-15 | 2001-05-22 | Raytheon Company | Adaptive antenna pattern control for a multiple access communication system |
DE69932859T2 (de) * | 1999-05-01 | 2007-02-15 | Nokia Corp. | Verfahren zur gerichteten funkkommunikation |
WO2001039320A1 (en) * | 1999-11-24 | 2001-05-31 | Metawave Communications Corporation | Remote stations with smart antenna systems and method for controlling beam directions |
FR2806838B1 (fr) * | 2000-03-27 | 2003-07-18 | Mitsubishi Electric Inf Tech | Procede de commande dynamique d'inclinaison d'antenne pour un systeme de radiotelecommunication |
US6459895B1 (en) * | 2000-09-26 | 2002-10-01 | Neoreach, Inc. | Methods for making a cellular system, transmitting to a mobile user in a cellular system, and evaluating the performance of a cellular system |
KR100355271B1 (ko) * | 2000-10-11 | 2002-10-11 | 한국전자통신연구원 | 적응형 전송기법을 이용한 강우 감쇠 보상방법 |
US6879845B2 (en) | 2000-12-01 | 2005-04-12 | Hitachi, Ltd. | Wireless communication method and system using beam direction-variable antenna |
US6778839B2 (en) * | 2001-01-02 | 2004-08-17 | Nokia Corporation | Method and device for transmission power selection and bit rate selection for channels with open loop power control |
JP2002246970A (ja) | 2001-02-22 | 2002-08-30 | Matsushita Electric Ind Co Ltd | 適応指向性可変装置 |
US20050107106A1 (en) * | 2002-02-25 | 2005-05-19 | Kimmo Valkealahti | Method and network element for controlling power and/or load in a network |
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2004
- 2004-01-16 WO PCT/JP2004/000307 patent/WO2004068883A1/ja active Application Filing
- 2004-01-16 EP EP04702827A patent/EP1596618A4/en not_active Withdrawn
- 2004-01-16 KR KR20057013973A patent/KR100715753B1/ko not_active IP Right Cessation
- 2004-01-16 CN CNA2004800031625A patent/CN1745598A/zh active Pending
- 2004-01-16 JP JP2005504669A patent/JP4434141B2/ja not_active Expired - Fee Related
- 2004-01-16 US US10/543,500 patent/US7454168B2/en not_active Expired - Fee Related
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JP2002521937A (ja) * | 1998-07-20 | 2002-07-16 | モトローラ・インコーポレイテッド | 資源割当方法および割当システム |
WO2001047146A1 (en) * | 1999-12-20 | 2001-06-28 | Telefonaktiebolaget Lm Ericsson (Publ) | Radio network control using uplink mobile transmit power |
JP2002345048A (ja) * | 2001-04-30 | 2002-11-29 | Docomo Communications Laboratories Usa Inc | 伝送制御方法 |
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Also Published As
Publication number | Publication date |
---|---|
US20060135062A1 (en) | 2006-06-22 |
EP1596618A1 (en) | 2005-11-16 |
JP4434141B2 (ja) | 2010-03-17 |
JPWO2004068883A1 (ja) | 2006-05-25 |
KR20050095634A (ko) | 2005-09-29 |
EP1596618A8 (en) | 2006-05-17 |
US7454168B2 (en) | 2008-11-18 |
CN1745598A (zh) | 2006-03-08 |
KR100715753B1 (ko) | 2007-05-08 |
EP1596618A4 (en) | 2010-12-08 |
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