WO2002061975A1 - Systeme et procede de communication - Google Patents
Systeme et procede de communication Download PDFInfo
- Publication number
- WO2002061975A1 WO2002061975A1 PCT/JP2001/000676 JP0100676W WO02061975A1 WO 2002061975 A1 WO2002061975 A1 WO 2002061975A1 JP 0100676 W JP0100676 W JP 0100676W WO 02061975 A1 WO02061975 A1 WO 02061975A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- power
- control means
- mobile terminal
- transmission power
- power control
- Prior art date
Links
- 238000004891 communication Methods 0.000 title claims abstract description 77
- 238000000034 method Methods 0.000 title claims description 22
- 230000005540 biological transmission Effects 0.000 claims abstract description 106
- 230000000694 effects Effects 0.000 description 27
- 238000012937 correction Methods 0.000 description 16
- 238000010586 diagram Methods 0.000 description 12
- 239000013256 coordination polymer Substances 0.000 description 5
- 239000000969 carrier Substances 0.000 description 3
- 230000007423 decrease Effects 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 230000004044 response Effects 0.000 description 2
- 101001139126 Homo sapiens Krueppel-like factor 6 Proteins 0.000 description 1
- 101000710013 Homo sapiens Reversion-inducing cysteine-rich protein with Kazal motifs Proteins 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000005684 electric field Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 101150015070 rnc2 gene Proteins 0.000 description 1
Classifications
-
- 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
- H04W52/34—TPC management, i.e. sharing limited amount of power among users or channels or data types, e.g. cell loading
- H04W52/343—TPC management, i.e. sharing limited amount of power among users or channels or data types, e.g. cell loading taking into account loading or congestion level
-
- 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
- H04W52/38—TPC being performed in particular situations
- H04W52/42—TPC being performed in particular situations in systems with time, space, frequency or polarisation diversity
Definitions
- the present invention relates to a communication system and a communication method, and more particularly to control of transmission power.
- Fig. 1 shows a partial configuration of a CDMA (Code Division Multiple Access) communication system.
- 1 is a PSTN (Public Switched Telephone Network)
- 2 is an RNC (Radio Network Controller) connected to PSTN 1.
- 3 are a plurality of BTSs (base stations) connected to the RNC 2
- 4 is a mobile terminal device that performs wireless communication with the BTS 3
- 5 is a cell within a range that can communicate with each BTS 3.
- the BTS 3 corresponding to the cell 5 receives the call. Responds to the call and receives a radio signal from the mobile terminal device 4. Then, the mobile terminal device 4 is identified from the demodulated signal obtained by demodulating the received wireless signal, and the called terminal device to be called is identified from the telephone number included in the demodulated signal. Next, these connection request information is transmitted to RNC2.
- the RNC 2 executes connection control between the mobile terminal device 4 that has originated the call and the called terminal device according to the connection request information. That is, if the called terminal device is another network, the information is transmitted to PSTN1. Ah Alternatively, if the called terminal is the mobile terminal device 4 within the same wireless network, the connection request information is transmitted to all the BTSs 4 accommodated. Each BTS 4 calls a mobile terminal device 4 existing in the corresponding cell 5 to call a telephone number.
- the RNC 2 specifies the maximum reference value and the minimum reference value of the mobile terminal device 4 that can access each of the BTSs 3 it accommodates, transmits the common pilot transmission power, and transmits to the mobile terminal device. Control power.
- the BTS 4 adjusts the radius of the corresponding cell 5 (the electric field strength of the transmission power). For example, if the number of mobile terminals 4 (this is referred to as “the number of traffic”) is within the specified range and the radius of the cell is R 1, the number of mobile terminals 4 decreases below the minimum reference value. Then, the radius of cell 5 is set to R2, and the communicable range is increased.
- Fig. 3 is a flow chart showing the operation of the cell radius adjustment.
- it is determined whether or not the number of traffic has exceeded the maximum reference value (step STl). Is reduced (step S ⁇ 2). Further, it is determined whether or not the number of traffic has decreased below the minimum reference value (Step S). T 3), if it decreases, expand the cell radius (step ST 4) o
- the radius is reduced or expanded independently for a certain cell. As a result, there has been a problem that interference or traffic bias occurs in a plurality of cells.
- the traffic control is insufficient by the conventional power control for adjusting the cell radius. There was a problem that.
- the present invention has been made to solve the above problems, and has as its object to reduce interference in a plurality of cells and to eliminate traffic bias. It is another object of the present invention to enable sufficient traffic control in a cell or in a plurality of cells. Disclosure of the invention
- a communication system is a power control unit that controls transmission power to a mobile terminal device that accesses one wireless area when performing wireless communication with a mobile terminal device within one wireless area in accordance with a control command. And a general control means for giving a control command to each of the plurality of power control means and collectively controlling the transmission power to the mobile terminal device in the plurality of radio relays.
- the power control means performs wireless communication with the mobile terminal device in one sector of a cell composed of a plurality of sections.
- the power calculation means calculates the transmission power to the mobile terminal device accessing one sector in accordance with the control command
- the general control means accommodates the plurality of power calculation means and controls each of the plurality of power control means.
- This is a base station that gives a control command to the cell and collectively controls the transmission power to the mobile terminal device in the cell.
- the power control means accesses a single cell when performing wireless communication with the mobile terminal device in one cell, and controls a transmission power to the mobile terminal device according to a control command.
- the general control means is a wireless network control device that accommodates a plurality of base stations, gives a control command to each of the plurality of base stations, and collectively controls transmission power to mobile terminal devices in a plurality of cells. It is like that. In addition, there is an effect that sufficient traffic control can be performed in each cell.
- the power control means performs, for the common pilot channel transmission power given from the general control means, a slot which is a predetermined amount of transmission / reception data or a frame comprising a plurality of slots.
- the transmission power to the mobile terminal device is controlled in each cycle of.
- the overall control means includes: The means receives a notification of the number of mobile terminal devices received by the means, and determines a control command to be given to each power control means based on the notification.
- the central control means is operable to execute a control command so as to prevent a gap in transmission power between adjacent wireless areas and a duplication of transmission power between adjacent wireless areas in a plurality of wireless areas to be controlled collectively. Is given to each power control means.
- the central control means grasps information on the common pilot channel transmission power in each power control means, and sets a reference signal-to-interference power ratio and a reference random number in each power control means. It controls the number of access channels.
- the overall control means defines a range of the maximum value and the minimum value of the common pilot channel transmission power in each power control means, and any power control means to be accommodated autonomously.
- the common pilot channel transmission power is controlled within the range specified for the power control means corresponding to the radio carrier adjacent to the radio carrier. It was done.
- the communication method provides a mobile terminal device in one radio area.
- a control command is given to the power control means for performing wireless communication with the mobile station, thereby controlling the transmission power to the mobile terminal apparatus accessing the one radio area, and transmitting the transmission power to the mobile terminal apparatus in a plurality of radio areas collectively.
- This has the effect of reducing interference in a plurality of wireless areas and eliminating traffic bias when performing wireless communication with a mobile terminal device for each wireless area.
- the power control means may control, for each common cycle channel transmission power given from a higher order, a slot that is a predetermined amount of transmission / reception data or a cycle of a frame including a plurality of slots. First, the transmission power to the mobile terminal device is controlled.
- each of the plurality of power control means receives a notification of the number of mobile terminal devices received, and determines a control command to be given to each power control means based on the notification.
- a control command is transmitted to a plurality of wireless relays so that a transmission power gap between adjacent wireless relays and a transmission power overlap between adjacent wireless relays do not occur. It is provided to each of the control means.
- the communication method according to the present invention is characterized in that information of common pilot channel transmission power in each of a plurality of power control means is grasped, a reference signal-to-interference power ratio and a reference random access channel number in each power control means. Is controlled.
- the range of the maximum value and the minimum value of the common pilot channel transmission power in each of the plurality of power control means is defined, and any power control means autonomously responds to the radio power.
- the common pilot channel transmission power is controlled within the specified range for the power control means corresponding to the wireless area adjacent to the wireless area. It is.
- FIG. 1 is a diagram showing a partial configuration of a conventional CDMA communication system.
- FIG. 2 is a diagram showing how a cell radius is adjusted in power control by a conventional communication system.
- FIG. 3 is a flowchart showing adjustment of a cell radius in a conventional communication system.
- FIG. 4 is a diagram showing a cell configuration of the communication system according to the first embodiment of the present invention.
- FIG. 5 is a diagram illustrating a BTS structure of the communication system according to the first embodiment of the present invention. It is a block diagram showing composition.
- FIG. 6 is a block diagram showing a configuration of a power calculation unit in FIG.
- FIG. 7 is a flowchart showing an operation of the communication system according to the first embodiment of the present invention.
- FIG. 8 is a diagram showing a communication system according to Embodiment 2 of the present invention.
- FIG. 9 is a block diagram showing a power calculator inside the RNC in FIG. BEST MODE FOR CARRYING OUT THE INVENTION
- FIG. 4 is a diagram showing a cell configuration of a communication system according to Embodiment 1 of the present invention.
- 11 is a BTS (base station) connected to an RNC (radio network controller)
- 12 is a It is a cell composed of 6 sectors (multiple radio areas) managed by BTS11.
- FIG. 5 is a block diagram showing a configuration of BTS 11 of the communication system according to Embodiment 1 of the present invention.
- 13 corresponds to each sector (sector 1 to sector 6) of cell 12
- Six transceivers, 14 are six power calculation units (power control means) corresponding to each transceiver 13
- 15 is a power control unit (overall control means) connected to each power calculation unit 14 )
- a to d are signals transmitted and received between the inside of the BT 311 and the 8 311 and 1] ⁇ ⁇ (not shown).
- FIG. 6 is a block diagram showing the configuration of the power calculation unit 14 in FIG. 5, where 16 is a comparator, 17 is a correction amount calculator, 18 is an adder, and e and f are the powers. These signals are transmitted and received within the operation unit 14. Next, the operation will be described.
- CPICH transmission power a common pilot channel transmission power (hereinafter referred to as “CPICH transmission power”) power indication signal a
- reference SIR reference signal to interference power ratio
- reference RACH number a reference random access A reference indication signal b including the number of channels (hereinafter, referred to as “reference RACH number”) is transmitted to the power control unit 15 of the BTS 11. That is, the control command set by the upper RNC is transmitted to the lower BTS 11.
- the power control unit 15 supplies the received power instruction signal a and the reference instruction signal b to each of the six power operation units 14.
- Each power calculator 14 supplies a power instruction signal a (a power instruction signal d after correction described later) to the corresponding transceiver 13 and also outputs a reference instruction signal b to the comparator 1 shown in FIG. Store them in memory 6 (not shown).
- Each transceiver 13 controls the transmission power to the mobile terminal device, that is, the downlink transmission power, based on the power instruction signal a.
- the range of sectors that is, the transmission power is small
- the range of sectors transmission Power
- the range of cell 12 composed of six sectors is controlled by power instruction signal a.
- the reference SI: and the reference R ACH number constituting the reference indication signal b stored in the comparator 16 of the power calculation unit 14 are related to this traffic control. This will be further described later.
- each transceiver 13 When each transceiver 13 receives an access from a mobile terminal device existing in the corresponding sector, it measures a received signal-to-interference ratio (hereinafter referred to as “received SIR”). Exist in the corresponding sector by measuring this received SIR The number of mobile terminal devices to be used can be measured. The transceiver 13 supplies the measured received SIR to the corresponding power calculator 14.
- received SIR received signal-to-interference ratio
- the power calculation unit 14 stores the received SIR supplied from the transceiver 13 in the memory of the comparator 16.
- the comparator 16 compares the stored received SIR with the reference SIR. Comparator 16 determines whether the received SIR is larger or smaller than the reference SIR. If the received SIR is smaller than the reference SIR, a plus comparison signal e is input to the correction amount calculator 17 if the received SIR is larger than the reference SIR.
- the correction amount calculator 17 calculates a correction amount based on the input comparison signal e, and inputs a correction signal f indicating the calculated correction amount to the adder 18.
- the adder 18 adds the correction amount of the correction signal f to the CPICH transmission power supplied from the RNC via the power control unit 15, and outputs the corrected power instruction signal d of the CPICH transmission power to the transceiver 1. 3 and the power controller 15.
- the power calculation unit 14 performs control to increase the downlink transmission power and performs control for the sector. Extend the range. Conversely, if the received SIR is larger than the reference SIR, that is, if the number of mobile terminals in the sector is larger than the reference, the power calculation unit 14 performs control to reduce the downlink transmission power and performs the range of the sector. To shrink.
- the power calculation unit 14 compares the CPICH transmission power supplied from the power control unit 15 with a predetermined amount of the transmission / reception data slot or a cycle of a frame including a plurality of slots. It controls the transmission power to the mobile terminal. Also, the power control of the downlink by each power calculation unit 14 is executed autonomously.
- FIG. 7 is a flowchart showing the operation of this adjacent sector control process.
- the value of the pointer n for designating the sector is set to 1 and the sector 1 is designated (step ST11).
- the loop of steps ST12 to ST15 is repeated while incrementing the pointer n. That is, it is determined whether or not the CPICH transmission power of sector (n) specified by pointer n has changed (step ST12), and if there is no change, the value of pointer n is incremented. It is reset (step ST 13). Then, it is determined whether or not the value of n has exceeded 6 (step ST14).
- step ST12 determines whether the CP ICH transmission power of sector (n) has changed. If the CP ICH transmit power changes, the CPI of the adjacent sector. 11 The transmission power is controlled within the range of the maximum / minimum CPICH transmission power specified by 11] ⁇ (step ST15).
- the transmission power to the mobile terminal device that accesses one task depends on the control command.
- a power control unit that gives a control command to each of the plurality of power calculation units 14 and collectively controls the transmission power to the mobile terminal device in the plurality of cells 12.
- the power calculation unit 14 compares the CP ICH transmission power given from the power control unit 15 with a predetermined amount of transmission / reception data, ie, a slot or a frame composed of a plurality of slots. Mobile terminal device for each cycle Since the transmission power to the mobile station is controlled, the transmission power in a plurality of wireless areas can be controlled at high speed.
- the power control unit 15 receives the notification of the number of mobile terminal devices received by each power calculation unit 14, and based on the notification, gives a control command to each power calculation unit 14, That is, since the CPICH transmission power is determined, there is an effect that the traffic load can be distributed over a wide range.
- the power control unit 15 issues a control command so as to prevent a gap in transmission power between adjacent sectors and an overlap in transmission power between adjacent sectors in a plurality of sectors that are collectively controlled. Since the power is supplied to each power calculation unit 14, there is an effect that interference between adjacent sectors can be reduced and traffic bias can be eliminated.
- the power control unit 15 defines the range of the maximum value and the minimum value of the CPICH transmission power in each power calculation unit 14, and any contained power calculation unit 14 is autonomous.
- the power control is performed in the sector corresponding to the CPICH, the CPICH transmission power is controlled within the range specified for the power calculation unit 14 corresponding to the sector adjacent to the sector. It is possible to control transmission power in a sector at high speed, to reduce interference between cells including a plurality of sectors, and to eliminate traffic bias.
- the power control unit 15 grasps information on the CPICH transmission power in each power calculation unit 14 and controls the reference SIR and reference RACH number in each power calculation unit 14. You may do it. In this case, there is an effect that optimal power control can be performed between adjacent wireless areas.
- FIG. 8 is a diagram showing a communication system according to Embodiment 2 of the present invention.
- reference numeral 19 denotes an RNC (overall control means)
- reference numeral 20 denotes three BTSs (power supply) connected to the RNC 19.
- Control means Each BTS 20 performs wireless communication with the mobile terminal device in the corresponding cell 1, 2, 3 (a plurality of wireless areas).
- FIG. 9 is a power calculation unit in the RNC 19 in FIG. 8, in which 21 is a power calculation unit, 22 is a comparator, 23 is a correction amount calculator, and 24 is an adder. . g to ml, 2, and 3 are signals transmitted and received within the RNC 19 and between the RNC 19 and each BTS 20.
- a power indication signal g of the CPICH transmission power and a reference indication signal h including the reference SIR and the reference RACH number are transmitted to the RNC 19. That is, the control command set by the higher order is transmitted to the lower RNC 19.
- the RNC 19 supplies the received power indication signal g and reference indication signal h to the internal power calculation unit 21.
- the power calculation unit 21 supplies the power indication signals m 1, m 2, and m 3 to each of the three BTSs 20 and also stores the reference indication signal h in the memory (not shown) of the comparator 22.
- Each BTS 20 controls the transmission power to the mobile terminal device, that is, the downlink transmission power, based on the power instruction signals m 1, m 2, and m 3. Thus, the range of the three cells 1, 2, 3 is controlled by the power indication signals m1, m2, m3, respectively. Then, when each BTS 20 receives an access from a mobile terminal device existing in the corresponding cell, it measures the received SIR. By measuring the received SIR, the number of mobile terminals existing in the corresponding sector can be measured. The BTS 20 transmits a measurement signal il, i2, i3 representing the measured received SIR to the RNC 19. The power calculator 21 of the RNC 19 stores the measurement signals i 1, i 2, i 3 received from each BTS 20 in the memory of the comparator 22.
- the comparator 22 compares each of the selected received SIRs with the stored reference SIR. Comparator 22 determines whether the received SIR is larger or smaller than the reference SIR. When the received SIR is smaller than the reference SIR, a plus (for example, 1) comparison signal j is provided. When the received SIR is larger than the reference SII, a minus (for example, 0) comparison signal j is provided. To enter.
- the correction amount calculator 23 calculates a correction amount based on the input comparison signal j, and inputs a correction signal k representing the calculated correction amount to the adder 24.
- the adder 24 adds the correction amount to the CPICH transmission power supplied from the higher order, and transmits a power instruction signal (for example, m2) of the corrected CPICH transmission power to the BTS20.
- a power instruction signal for example, m2
- the transmission power of the corresponding BTS 20 changes, and the range of the corresponding cell (for example, cell 2) changes.
- the correction is also made for BTS 20 corresponding to cells adjacent to this cell (for example, cell 1 and cell 3). Transmit power indication signal (for example, m 1 and m 3) of CP ICH transmission power I do.
- the RNC 19 determines whether the CPICH transmission power has changed in any of the BTS 20 cells, and if it has changed, the CPICH transmission power of the adjacent cell is specified by the higher order. Control within the maximum and minimum CP ICH transmission power range.
- the transmission power to the mobile terminal device accessing one cell is controlled.
- BTS 20 that controls the transmission power to mobile terminals in a plurality of cells by giving a control command to each of the plurality of BTSs 20. Therefore, when performing wireless communication with the mobile terminal device for each cell, multiple cells This has the effect of reducing interference and eliminating traffic bias. In addition, there is an effect that sufficient traffic control can be performed in a cell and in a plurality of cells.
- one power control unit when one power control unit performs radio communication with a mobile terminal device in a corresponding sector (or cell), one power control unit performs one sector (or cell).
- the control power controls the transmission power to the mobile terminal device that accesses the mobile terminal in accordance with the control command. Suitable for systems that reduce interference and eliminate traffic bias in multiple sectors (or cells) when performing wireless communication with mobile terminals for each sector by controlling the transmission power to the devices collectively. ing.
Description
Claims
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US10/204,407 US7349712B2 (en) | 2001-01-31 | 2001-01-13 | Communications system with transmitting power control and method for the same |
PCT/JP2001/000676 WO2002061975A1 (fr) | 2001-01-31 | 2001-01-31 | Systeme et procede de communication |
CN01807342.5A CN1237739C (zh) | 2001-01-31 | 2001-01-31 | 通信系统及通信方法 |
JP2002561395A JPWO2002061975A1 (ja) | 2001-01-31 | 2001-01-31 | 通信システム及び通信方法 |
EP01902714A EP1261150A4 (en) | 2001-01-31 | 2001-01-31 | COMMUNICATION SYSTEM AND METHOD |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/JP2001/000676 WO2002061975A1 (fr) | 2001-01-31 | 2001-01-31 | Systeme et procede de communication |
Publications (1)
Publication Number | Publication Date |
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WO2002061975A1 true WO2002061975A1 (fr) | 2002-08-08 |
Family
ID=11736976
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2001/000676 WO2002061975A1 (fr) | 2001-01-31 | 2001-01-31 | Systeme et procede de communication |
Country Status (5)
Country | Link |
---|---|
US (1) | US7349712B2 (ja) |
EP (1) | EP1261150A4 (ja) |
JP (1) | JPWO2002061975A1 (ja) |
CN (1) | CN1237739C (ja) |
WO (1) | WO2002061975A1 (ja) |
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JP2012222379A (ja) * | 2011-04-04 | 2012-11-12 | Hitachi Ltd | 送信電力制御を行う無線通信装置、無線通信方法 |
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US6799045B1 (en) * | 2000-11-07 | 2004-09-28 | Telefonaktiebolaget Lm Ericsson (Publ) | Reliable congestion control in a CDMA-based mobile radio commmunications system |
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 |
-
2001
- 2001-01-13 US US10/204,407 patent/US7349712B2/en not_active Expired - Fee Related
- 2001-01-31 EP EP01902714A patent/EP1261150A4/en not_active Withdrawn
- 2001-01-31 WO PCT/JP2001/000676 patent/WO2002061975A1/ja active Application Filing
- 2001-01-31 JP JP2002561395A patent/JPWO2002061975A1/ja active Pending
- 2001-01-31 CN CN01807342.5A patent/CN1237739C/zh not_active Expired - Fee Related
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JPS6367034A (ja) * | 1986-09-08 | 1988-03-25 | Nec Corp | 移動無線通信方式 |
JPH06268574A (ja) * | 1993-03-11 | 1994-09-22 | Hitachi Ltd | セルラ移動通信システム |
JPH07273722A (ja) * | 1994-04-01 | 1995-10-20 | Oki Electric Ind Co Ltd | 電力制御装置 |
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JP2000078648A (ja) * | 1998-08-27 | 2000-03-14 | Japan Telecom Co Ltd | 無線デジタル通信サービスの提供方法 |
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Cited By (3)
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WO2010122834A1 (ja) * | 2009-04-24 | 2010-10-28 | 日本電気株式会社 | 通信システム |
JP5083462B2 (ja) * | 2009-04-24 | 2012-11-28 | 日本電気株式会社 | 通信システム |
JP2012222379A (ja) * | 2011-04-04 | 2012-11-12 | Hitachi Ltd | 送信電力制御を行う無線通信装置、無線通信方法 |
Also Published As
Publication number | Publication date |
---|---|
CN1237739C (zh) | 2006-01-18 |
EP1261150A1 (en) | 2002-11-27 |
CN1419751A (zh) | 2003-05-21 |
EP1261150A4 (en) | 2007-06-20 |
US7349712B2 (en) | 2008-03-25 |
JPWO2002061975A1 (ja) | 2004-06-03 |
US20030013475A1 (en) | 2003-01-16 |
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