WO2005081428A1 - 移動通信システム及び移動通信方法 - Google Patents
移動通信システム及び移動通信方法 Download PDFInfo
- Publication number
- WO2005081428A1 WO2005081428A1 PCT/JP2005/002208 JP2005002208W WO2005081428A1 WO 2005081428 A1 WO2005081428 A1 WO 2005081428A1 JP 2005002208 W JP2005002208 W JP 2005002208W WO 2005081428 A1 WO2005081428 A1 WO 2005081428A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- base station
- terminal device
- wireless base
- deterioration
- radio base
- Prior art date
Links
- 238000000034 method Methods 0.000 title claims abstract description 25
- 238000010295 mobile communication Methods 0.000 title claims description 34
- 239000000872 buffer Substances 0.000 claims abstract description 14
- 238000004891 communication Methods 0.000 claims description 50
- 230000006866 deterioration Effects 0.000 claims description 37
- 238000001514 detection method Methods 0.000 claims description 13
- 230000006870 function Effects 0.000 claims description 12
- 230000003139 buffering effect Effects 0.000 claims description 10
- 230000015556 catabolic process Effects 0.000 claims 5
- 238000006731 degradation reaction Methods 0.000 claims 5
- 230000005540 biological transmission Effects 0.000 description 14
- 238000010586 diagram Methods 0.000 description 8
- 230000011664 signaling Effects 0.000 description 4
- 230000010365 information processing Effects 0.000 description 3
- 230000004044 response Effects 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000004590 computer program Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000005641 tunneling Effects 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/02—Buffering or recovering information during reselection ; Modification of the traffic flow during hand-off
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/08—Reselecting an access point
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/24—Reselection being triggered by specific parameters
- H04W36/30—Reselection being triggered by specific parameters by measured or perceived connection quality data
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W92/00—Interfaces specially adapted for wireless communication networks
- H04W92/16—Interfaces between hierarchically similar devices
- H04W92/20—Interfaces between hierarchically similar devices between access points
Definitions
- the present invention relates to a handover technique for a mobile communication system using an IP network, and more particularly to a packet transfer technique when a communicating terminal performs a handover.
- a terminal is connected to an access router A equipped with a wireless base station function (hereinafter referred to as a wireless base station router).
- a wireless base station router When the handover to the wireless base station router B is completed, the terminal requests the wireless base station router A to transfer a packet addressed to the terminal after completing the handover.
- the wireless base station router A transfers the packet addressed to the terminal to the wireless base station router B using the IP tunneling technology.
- the wireless base station router A serves as an anchor, and the wireless base station router A and the wireless base station router B maintain the tunnel and maintain the wireless base station.
- a new tunnel between the station router B and the wireless base station router C is also created, and packets destined for the terminal are sent to the destination using two tunnels until the link-level handover of the terminal is completed. Delivered to wireless base station router C. Thereafter, when the link-level handover of the terminal is completed, a new tunnel is created between the wireless base station router A and the wireless base station router C, and the wireless base station router A transfers the transfer destination from the wireless base station B to the wireless base station B. Switching to the radio base station C, the packet addressed to the terminal is delivered using the newly created tunnel.
- the tunnels between the wireless base station router A and the wireless base station router B and between the wireless base station router B and the wireless base station router C are automatically released by the timeout determined when the tunnel was created.
- the former handover described here is called a two-way handover, and the latter handover is called a three-way handover.
- the source wireless base station router buffers the packets addressed to the terminal during handover of the terminal, and when the handover is completed, the source wireless base station router sends a packet to the destination wireless base station router.
- a method of restarting the transfer of the data is described in, for example, the following document 1.
- Reference 1 Japanese Patent Application Laid-Open No. 2003-047037
- FIG. 1 shows a transmission / reception packet sequence 100 of the terminal, a transmission / reception packet sequence 110 of the radio base station router # 1, a transmission / reception packet sequence 120 of the radio base station router # 2, and a transmission / reception packet sequence 130 of the communication partner.
- a terminal is communicating with a communication partner via wireless base station router # 1 (step 1).
- the terminal decides to perform a handover from the wireless base station router # 1 to the wireless base station router # 2 due to deterioration of signal reception power in the terminal direction (step 2), the terminal performs a PrRtSol (Router Solicitation for Proxy) message 140 is transmitted to the wireless base station router # 1 (Step 3). Since the source IP address of the packet received by the terminal is the IP address of the communication partner, the HTT (Handover To Third) flag indicating a three-way handover is not set in the PrRtSol message here.
- PrRtSol Receiver Solicitation for Proxy
- HI message 150 Contains a CoA (Care of Address) used by the terminal under the wireless base station router # 2, a CoA currently used by the terminal, and a timer value for deleting the tunnel.
- CoA Care of Address
- the wireless base station router # 2 Upon receiving the HI message 150, the wireless base station router # 2 checks the CoA, and if it is determined that the use is permitted, transmits a HACK (Handover Acknowledge) message 160 including information indicating permission of handover. Return to wireless base station router # 1 (step 5). Upon receiving the HACK message 160 and detecting that the handover of the terminal is permitted, the radio base station router # 1 buffers the packet addressed to the terminal and notifies the CoA to be used at the handover destination by a PrRtAdv (Proxy Router Advertisement) message. The terminal is notified at 170 (step 6).
- PrRtAdv Proxy Router Advertisement
- the terminal Upon receiving the PrRtAdv message 170, the terminal performs link-level handover (step 7) .When the handover is completed, the terminal sends a Fast-Neighbor Advertisement (FNA) message 180 indicating completion of the handover to the wireless base station router # 2. Submit (Step 8).
- FNA Fast-Neighbor Advertisement
- Wireless base station router # 2 receives the FNA message 180,
- An Advertisement (NA) message 190 is returned to the terminal (step 9).
- the terminal Upon receiving the NA message 190, the terminal transmits an FBU (Fast-Binding Update) message 200 including a new CoA to request a transfer of a packet addressed to the terminal to the wireless base station router # 1. (Step 10).
- FBU Fast-Binding Update
- Wireless base station router # 1 returns an FBACK (Fast-Binding Acknowledgment) message 210 to the terminal (step 11), and transmits a packet addressed to the terminal that has been notifying by FBU message 200 in FBU message 200. Encapsulated and transferred to. Thus, the packet addressed to terminal 50 transmitted by the communication partner is transferred to the terminal via wireless base station router # 1 and wireless base station router # 2 (step 12).
- FBACK Fast-Binding Acknowledgment
- the transfer route is a route that passes through each wireless base station router, the transmission delay increases. Furthermore, when node-overs occur multiple times in succession, the complexity of management and the transmission delay increase significantly.
- the present invention has been made in view of the above-described problems, and an object of the present invention is to make the arrival order of packets received by the terminal equal to the transmission order of the transmitting terminal when the terminal performs a three-way handover.
- An object of the present invention is to solve the above-mentioned problem by providing a technique for making the same.
- an object of the present invention is to solve the above-described problem by providing a technique for minimizing transmission delay of communication after continuous handover.
- a first invention for solving the above problems is a mobile communication system including a plurality of radio base stations and a terminal device connectable to the radio base stations,
- the terminal device performs a handover from a first wireless base station to a second wireless base station and performs communication along a route passing through the first wireless base station
- the terminal device and the second wireless base station are communicated with each other.
- Deterioration detection means for detecting deterioration of the communication status with the station
- the first radio base station transmits the terminal before the terminal device performs a handover.
- the buffering of the packet addressed to the device is started, and after the handover of the terminal device is completed, in addition to the packet addressed to the terminal device buffered by the first radio base station, the newly received terminal
- the deterioration detecting means may judge the deterioration of the communication condition based on a detection result of a signal reception power, a bit error rate, or a packet error rate. [0025] Further, the deterioration detecting means may be provided in the terminal device !, or may be provided in the wireless base station.
- the second radio base station may transmit a packet addressed to the terminal device to the first radio base station before the terminal device performs a handover. May be further provided.
- the terminal device sets a radio base station to be handed over to another radio base station in accordance with a result of searching for a communication status with another radio base station.
- the station may have a change means to change.
- the order of packets received by the terminal can be prevented from being changed. This is because, before the terminal starts handover, the anchor base station router starts buffering packets destined for the terminal, and after the handover of the terminal is completed, the packet destined for the terminal being buffered is completed. Are transferred to the wireless base station router at the node over in the order in which they were received.
- tunnels managed by a wireless base station router can be reduced, and control of the wireless base station router can be simplified. This is because only two tunnels between the base station router as the anchor and the source base station router and between the base station router as the anchor and the destination base station router during handover of the terminal. Is used to transfer the packet addressed to the terminal.
- the transmission delay of communication after continuous handover can be minimized. This is because the communication path after the handover between the three parties does not pass through the source wireless base station router but communicates only through the anchor wireless base station router and the destination wireless base station router. It is.
- FIG. 1 is an operation sequence diagram of a two-party handover for explaining a conventional example.
- FIG. 2 is a network configuration diagram for describing a first embodiment of the present invention.
- FIG. 3 is a configuration diagram of a wireless base station router for explaining the first embodiment of the present invention.
- FIG. 4 is a configuration diagram of a terminal for explaining the first embodiment of the present invention.
- FIG. 5 is an operation sequence diagram of a three-way handover for explaining the first embodiment of the present invention.
- FIG. 6 is a configuration diagram for explaining an information processing unit according to a second embodiment of the present invention.
- the wireless base station router serving as an anchor buffers packets addressed to the terminal device during the handover. Then, the tunnel between the wireless base station serving as the anchor and the source wireless base station and the tunnel between the wireless base station serving as the anchor and the destination wireless base station are switched and used. Transfers packets addressed to the device.
- the mobile communication system according to the first embodiment of the present invention will be described with reference to the network configuration diagram shown in FIG.
- three wireless base station routers 40, 41, and 42 and a communication partner 30 of a terminal are connected to an Internet network 10 by wired links 70-73, respectively.
- the terminal 50 communicates with the communication partner 30 via the wireless link 60.
- FIG. 3 illustrates the wireless base station router 40 as an example, the wireless base station routers 41 and 42 have the same configuration.
- the wireless base station router 40 includes a handover control unit 300, a tunnel management unit 310, a route control unit 330, a wired link control unit 350, and a wireless link control unit 360.
- the handover control unit 300 has a function of managing the handover state of the terminal 50, a function of terminating signaling with the terminal 50, and a function of terminating signaling with another wireless base station router. Handover control in order to receive The route information 340 held by the route control unit 330 is changed via the toughness 380.
- Tunnel management section 310 receives a packet addressed to a terminal being handed over via proxy transmission / reception interface 390, and holds the packet in internal buffer 320. Furthermore, when the handover of the terminal 50 is completed, the tunnel management unit 310 encapsulates the packet addressed to the terminal 50 in the buffer 320 by IP in IP according to the instruction of the handover control unit 300 notified via the tunnel control interface 370. In parallel with output to the route control unit 330 via the packet transmission / reception interface 390, buffering of the newly received packet addressed to the terminal 50 is performed.
- the path control unit 330 performs the handover control from the first link control unit 350 via the first link control interface 410 and from the second link control unit 360 via the second link control interface 400.
- a packet is received from the tunnel management unit 310 via the packet transmission / reception interface 390 from the tunnel management unit 310 via the handover control interface 380, the packet is transferred, that is, transmitted based on the route information 340 held in the route control unit 330. It determines whether the route is a wired link or a wireless link, and transfers the received packet. If the received packet is signaling between wireless base station routers or terminals, the route control unit 330 passes the packet to the handover control unit 300, and if the received packet is a packet addressed to the terminal under handover, passes it to the tunnel management unit. .
- the radio link control unit 360 monitors the state of the link, and when the deterioration of the reception characteristics, the establishment of the link, and the disconnection occur, uses them as trigger information via the link trigger interface 420 as handover control. Notify part 300.
- FIG. 4 is a configuration example of the terminal 50.
- the terminal 50 includes a second link control unit 530, a route control unit 510, and a handover control unit 500.
- the second link control unit 530 passes the packet received via the wireless link 60 to the route control unit 510 via the second link control interface 550, and passes the packet received from the route control unit 510.
- the transmitted packet is transmitted to the wireless link 60.
- the second link control unit 530 monitors the link status, and when the deterioration of the reception characteristics and the establishment and disconnection of the link occur, the second link control unit 530 notifies the handover control unit 500 as trigger information via the link trigger interface 570.
- the path control unit 510 has the path control information 520 therein, and upon receiving the packet, based on the path control information 520, the packet encapsulated with the CoA (Care-of Address) is sent to the handover control unit 500.
- CoA Care-of Address
- the other packets are output to the upper layer interface 560.
- the route control unit 510 also processes packets received via the handover control unit 500 or the upper layer interface 560. Specifically, the path control unit 510 determines whether to transmit the packet based on the path control information 520 for the packet, and if it is determined that the packet is to be transmitted, via the second link control interface 550. And outputs it to the second link control section 530.
- the handover control unit 500 manages a handover state and has a function of terminating signaling with the wireless base station router.
- Handover control section 500 decapsulates the encapsulated packet received from path control section 510 via handover control interface 540, and outputs the decapsulated packet to path control section 510 again. Further, the handover state is changed based on the link trigger information notified from the second link control unit 530 via the link trigger interface 570.
- FIG. 5 shows an operation when the terminal performs a handover to the wireless base station router # 3 in a tunnel transfer state immediately after the terminal performs a handover from the wireless base station router # 1 to the wireless base station router # 2. It is a time chart.
- the packet transmitted by communication partner 30 is delivered to the terminal via wireless base station router # 1 and wireless base station router # 2 (step 501).
- Terminal 50 determines handover from base station router # 2 to base station router # 3 due to deterioration of signal reception power in the terminal direction (step 502), and terminal 50 transmits PrRtSol message 650 wirelessly. Transmit to base station router # 2. Communication received by terminal 50 Since the source IP address of the packet from the partner 30 is the IP address of the wireless base station router # 1, an HTT (Handover To Third) flag indicating a three-way handover is set in the PrRtSol message here.
- HTT Heandover To Third
- Wireless base station router # 2 receives the PrRtSol message 650 (step 503), and there is a problem! / ⁇ is that wireless base station router # 2 has deteriorated wireless link quality from terminal to wireless base station router # 2.
- wireless base station router # 2 decides to hand over the terminal to wireless base station router # 3 (step 502-2)
- wireless base station router # 2 sends HTT request message 660 to wireless base station router # 1. Transmit (step 504).
- the HTT request message 660 includes the CoA currently used by the terminal 50.
- the wireless base station router # 1 starts buffering packets addressed to the terminal 50 and transmits an HI message 670 to the wireless base station router # 3 (step 505).
- the wireless base station router # 3 determines that the handover is permitted, it returns a HACK message 680 to the wireless base station router # 2 (step 506), and the wireless base station router # 2 sends an HTT response message 690. Return to wireless base station router # 2 (step 507).
- the HTT response message 690 contains the CoA used by the terminal at the handover destination.
- Wireless base station router # 2 transmits a PrRtAdv message 700 including the CoA notified in HTT response message 690 to terminal 50 (step 508).
- terminal 50 Upon receiving the PrRtAdv message, terminal 50 executes a link-level handover.
- the terminal 50 sends an FNA message 710 to the wireless base station router # 3 (step 510), and the wireless base station router # 3 receives this, and responds with an NA message 720. (Step 511).
- Terminal 50 having received the NA message transmits an FBU message 730 including the CoA notified by PrRtAdv message 700 to wireless base station router # 1 (step 512).
- Wireless base station router # 1 returns an FBACK message 740 (step 513), and also encapsulates and transfers the buffered packet addressed to terminal 50 to the CoA notified by FBU message 730. In this way, the packet addressed to terminal 50 transmitted by communication partner 30 is delivered to terminal 50 via wireless base station router # 1 and wireless base station router # 3 (step 514).
- the present invention is not limited to the first embodiment of the present invention, but can be moderately converted within the scope of the present invention.
- the force shown for a three-way handover in which handover is performed twice consecutively is applicable even when handover is performed three or more times continuously.
- the radio base station and the terminal device according to the present invention can also be realized by a power computer program that can be configured by hardware.
- FIG. 6 is a general block configuration diagram of an information processing unit implemented in a wireless base station and a terminal device according to the present invention.
- the information processing unit shown in FIG. 6 includes a processor 601, a program memory 602, and a storage medium 60
- the processor 601 includes all or some of the above-described handover control unit 300, tunnel management unit 310, route control unit 330, wired link control unit 350, and wireless link control unit 360. This function is processed based on the program stored in the program memory 602. Further, the storage medium 603 stores all or a part of the route information 340.
- the processor 601 performs all or some of the functions of the above-described second link control unit 530, route control unit 510, and node and handover control unit 500. Processing is performed based on the program stored in the program memory 602. Further, the storage medium 603 stores all or a part of the route information 520.
- the wireless base station router serving as an anchor starts to buffer the packet addressed to the terminal, and after the handover of the terminal is completed, the buffering is performed.
- the packets received by the terminal are transferred to the wireless base station router at the node over in the order in which they were received, so that when the terminal performs a three-way handover, the order of the packets received by the terminal is prevented from being changed. Can be.
- the present invention at the time of handover of a terminal, between a wireless base station router serving as an anchor and a source wireless base station router, and between a wireless base station router serving as an anchor and a destination wireless base station router Since the configuration is such that the packet addressed to the terminal is transferred using only the two tunnels, the number of tunnels managed by the wireless base station router can be reduced, and the control of the wireless base station router can be simplified.
- the present invention adopts a configuration in which communication is performed only via the wireless base station router serving as an anchor and the destination wireless base station router, the transmission delay of communication after continuous handover is reduced. It can be as small as possible.
Abstract
Description
Claims
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN2005800127406A CN1947359B (zh) | 2004-02-25 | 2005-02-15 | 移动通信系统及移动通信方法 |
US10/590,741 US20070171875A1 (en) | 2004-02-25 | 2005-02-15 | Mobile communication system and mobile communication method |
EP05719110A EP1720267A1 (en) | 2004-02-25 | 2005-02-15 | Mobile communication system and mobile communication method |
JP2006510192A JPWO2005081428A1 (ja) | 2004-02-25 | 2005-02-15 | 移動通信システム及び移動通信方法 |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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JP2004050048 | 2004-02-25 | ||
JP2004-050048 | 2004-02-25 |
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WO2005081428A1 true WO2005081428A1 (ja) | 2005-09-01 |
Family
ID=34879572
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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PCT/JP2005/002208 WO2005081428A1 (ja) | 2004-02-25 | 2005-02-15 | 移動通信システム及び移動通信方法 |
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Country | Link |
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US (1) | US20070171875A1 (ja) |
EP (1) | EP1720267A1 (ja) |
JP (1) | JPWO2005081428A1 (ja) |
KR (1) | KR100769380B1 (ja) |
CN (1) | CN1947359B (ja) |
WO (1) | WO2005081428A1 (ja) |
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- 2005-02-15 US US10/590,741 patent/US20070171875A1/en not_active Abandoned
- 2005-02-15 JP JP2006510192A patent/JPWO2005081428A1/ja active Pending
- 2005-02-15 KR KR1020067019573A patent/KR100769380B1/ko not_active IP Right Cessation
- 2005-02-15 CN CN2005800127406A patent/CN1947359B/zh not_active Expired - Fee Related
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KR100917760B1 (ko) | 2006-03-27 | 2009-09-15 | 후지쯔 가부시끼가이샤 | 통신 방법 및 통신 장치 |
JP2007274657A (ja) * | 2006-03-31 | 2007-10-18 | Matsushita Electric Ind Co Ltd | 移動通信制御システム、移動通信制御方法、パケット転送装置、基地局装置及び移動端末 |
CN101697617B (zh) * | 2006-09-06 | 2014-11-05 | 夏普株式会社 | 通信系统、移动终端、通信控制方法 |
CN101697617A (zh) * | 2006-09-06 | 2010-04-21 | 夏普株式会社 | 通信系统、移动终端、通信控制方法 |
JP2012142983A (ja) * | 2006-09-06 | 2012-07-26 | Sharp Corp | ネットワークベースipモビリティプロトコルを利用した中継装置、移動端末及び中継装置の通信方法 |
CN102638786A (zh) * | 2006-09-06 | 2012-08-15 | 夏普株式会社 | 通信系统、通信控制方法、中继装置、移动终端 |
USRE45465E1 (en) | 2006-09-06 | 2015-04-14 | Sharp Kabushiki Kaisha | Communication system using network base IP mobility protocol, control apparatus, router and communication method thereof |
US8325677B2 (en) | 2006-09-06 | 2012-12-04 | Sharp Kabushiki Kaisha | Communication system using network base IP mobility protocol, control apparatus, router and communication method thereof |
CN102638786B (zh) * | 2006-09-06 | 2015-01-21 | 夏普株式会社 | 通信系统、通信控制方法、中继装置、移动终端 |
JP2009296616A (ja) * | 2006-09-06 | 2009-12-17 | Sharp Corp | ネットワークベースipモビリティプロトコルを利用した通信システム、制御装置、ルータ及びその通信方法 |
JP2013201781A (ja) * | 2006-09-06 | 2013-10-03 | Sharp Corp | ネットワークベースipモビリティプロトコルを利用した中継装置、移動端末及び中継装置の通信方法 |
US8768357B2 (en) | 2007-04-25 | 2014-07-01 | Qualcomm Incorporated | Changes of forward-link and reverse-link serving access points |
JP2012199958A (ja) * | 2007-04-25 | 2012-10-18 | Qualcomm Inc | 順方向リンク及び逆方向リンクのサービングアクセスポイントの変更 |
JP2015092678A (ja) * | 2007-04-25 | 2015-05-14 | クゥアルコム・インコーポレイテッドQualcomm Incorporated | 順方向リンク及び逆方向リンクのサービングアクセスポイントの変更 |
CN101925144B (zh) * | 2009-06-15 | 2013-09-25 | 华为技术有限公司 | 路由切换方法、装置和系统 |
JP2013503553A (ja) * | 2009-08-25 | 2013-01-31 | テレフオンアクチーボラゲット エル エム エリクソン(パブル) | モビリティアンカーの移転 |
US9480099B2 (en) | 2009-08-25 | 2016-10-25 | Telefonaktiebolaget Lm Ericsson (Publ) | Mobility anchor relocation |
US11076275B2 (en) | 2016-12-24 | 2021-07-27 | Huawei Technologies Co., Ltd. | Method and apparatus for communication between user equipments |
US11864075B2 (en) | 2016-12-24 | 2024-01-02 | Huawei Technologies Co., Ltd. | Method and apparatus for communication between user equipments |
Also Published As
Publication number | Publication date |
---|---|
CN1947359B (zh) | 2010-05-05 |
KR100769380B1 (ko) | 2007-10-22 |
KR20070004762A (ko) | 2007-01-09 |
JPWO2005081428A1 (ja) | 2008-02-21 |
US20070171875A1 (en) | 2007-07-26 |
CN1947359A (zh) | 2007-04-11 |
EP1720267A1 (en) | 2006-11-08 |
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