WO2010020191A1 - 提高同步数字体系虚级联延时补偿缓存效率的方法及装置 - Google Patents
提高同步数字体系虚级联延时补偿缓存效率的方法及装置 Download PDFInfo
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- WO2010020191A1 WO2010020191A1 PCT/CN2009/073387 CN2009073387W WO2010020191A1 WO 2010020191 A1 WO2010020191 A1 WO 2010020191A1 CN 2009073387 W CN2009073387 W CN 2009073387W WO 2010020191 A1 WO2010020191 A1 WO 2010020191A1
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- 238000000034 method Methods 0.000 title claims abstract description 39
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- 238000013507 mapping Methods 0.000 claims abstract description 15
- 230000005540 biological transmission Effects 0.000 claims description 10
- 238000010586 diagram Methods 0.000 description 7
- 238000012545 processing Methods 0.000 description 6
- 230000004913 activation Effects 0.000 description 3
- 230000009977 dual effect Effects 0.000 description 3
- 238000004891 communication Methods 0.000 description 2
- 206010011469 Crying Diseases 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000003139 buffering effect Effects 0.000 description 1
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Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J3/00—Time-division multiplex systems
- H04J3/02—Details
- H04J3/06—Synchronising arrangements
- H04J3/062—Synchronisation of signals having the same nominal but fluctuating bit rates, e.g. using buffers
- H04J3/0623—Synchronous multiplexing systems, e.g. synchronous digital hierarchy/synchronous optical network (SDH/SONET), synchronisation with a pointer process
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J3/00—Time-division multiplex systems
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F12/00—Accessing, addressing or allocating within memory systems or architectures
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J2203/00—Aspects of optical multiplex systems other than those covered by H04J14/05 and H04J14/07
- H04J2203/0001—Provisions for broadband connections in integrated services digital network using frames of the Optical Transport Network [OTN] or using synchronous transfer mode [STM], e.g. SONET, SDH
- H04J2203/0089—Multiplexing, e.g. coding, scrambling, SONET
- H04J2203/0094—Virtual Concatenation
Definitions
- the present invention relates to the field of communications technologies, and in particular, to a method and apparatus for improving the efficiency of delay compensation buffering of a virtual concatenation group (VCG) in a Synchronous Digital Hierarchy (SDH) device.
- VCG virtual concatenation group
- SDH Synchronous Digital Hierarchy
- VC12 low-order virtual container
- VC3 high-order virtual container
- VC4 high-order virtual container
- TDM time division multiplexing
- VC cascading The VC cascade includes Continuous Concatenation and Virtual Concatenation (VCAT), where the virtual concatenation is widely used because the SDH equipment on the transmission path has no special requirements.
- VCAT Virtual Concatenation
- each VC member of the VCG starts from the same transmission source, and each is transmitted as an independent transmission unit in the SDH network, and finally reaches the same reception destination.
- each VC member may have a different path, that is, each member has a different delay on the transmission line. Therefore, at the receiving destination, all VC members in the VCG need to be aligned, and then the inter-byte interpolation method is used to recover the data of the transmitting end.
- each VC member uses a FIFO (First In First Out) register for caching, waiting for the latest VC member to arrive and then read it out. This process is called delay compensation for VCG.
- FIFO First In First Out
- SSRAM synchronous delay random access memory
- SDRAM Synchronous Dynamic
- Random Access Memory such as Double Rate Rate (DDR)
- DDR Double Rate Rate
- the device structure using SDRAM as the delay compensation buffer is shown in Fig. 1.
- the scheduler polls all VC write or read request FIFO registers in sequence, and places the request in the SDRAM shared operation request FIFO register.
- the SDRAM controller reads the request in the FIFO register and performs corresponding reading and writing. operating.
- FIG. 2 shows the timing diagram of a write operation of the SDRAM.
- a complete write operation includes row activation, row activation wait, write command, Write command wait, data operation, line close, etc.
- the overhead is much, the read operation overhead is basically the same as the read operation.
- a burst write operation sequentially outputs a row activation command (ACT), a write command (WR), and a precharge command (RE) on the command bus.
- ACT row activation command
- WR write command
- RE precharge command
- an object of the present invention is to provide a method and apparatus for improving SDH virtual concatenation delay compensation buffer efficiency, which improves the efficiency of SDH virtual concatenation delay compensation buffer by reducing the useless overhead of SDRAM operation.
- the present invention provides a method for improving the efficiency of a virtual cascading delay compensation cache in a synchronous digital system, the method comprising:
- the VC write request FIFO register and the VC read request FIFO register are polled. Further, the number of the virtual containers VC is 4N+4; the number of the banks is 4M+4, where N and M are integers, and N>M.
- mapping the virtual container VC in the repository Bank of the synchronous dynamic random access memory SDRAM include:
- the virtual containers are arranged in order as the first virtual container VC, the second virtual container VC
- the first 4M+4 virtual containers VC are respectively stored in the first bank of the SDRAM, the second
- Bank (4M+4) Bank store 2 (4M+4) virtual containers after the first 4M+4 virtual containers in the first bank of the SDRAM, the second bank (4M+4)
- the last 4M+4 virtual containers are respectively stored in the first bank and the second bank (4M+4) Bank of the SDRAM.
- the write request of the SDRAM of the virtual container VC is respectively written into the write request first-in first-out FIFO register of the corresponding virtual container VC;
- the virtual containers are arranged in order as the first virtual container VC, the second virtual container VC
- the VC SDRAM write request is written into the write request FIFO register in the first virtual container VC; ...; the (4M+4) virtual container VC, the 2nd (4M+4) virtual container VC (4N+4)
- the SDRAM write request of the virtual container VC is written into the write request FIFO register in the first virtual container VC;
- the steps of respectively writing the read request of the SDRAM of the virtual container VC into the read request FIFO register of the corresponding virtual container VC include:
- the VC SDRAM read request is written into the read request FIFO register in the first virtual container VC; ...; the (4M+4) virtual container VC, the 2nd (4M+4) virtual container VC ( 4N+4)
- the SDRAM read request of the virtual container VC is written into the read request FIFO register in the first virtual container VC.
- the present invention also provides a method for improving the efficiency of a virtual cascading delay compensation buffer in a synchronous digital system, the method comprising:
- the VC is a virtual container VC4 in the level 4 STM-4 of the synchronous transmission module.
- the VC4 includes a standard container C4 or three virtual containers VC3.
- the method further includes:
- the buffer area of each of the VC4s is divided into three first sub-buffer areas, and one virtual container VC3 is stored in each of the first sub-bucket areas.
- the virtual container VC3 includes: a standard container C3 or 21 virtual containers VC12.
- the method further includes:
- the buffer area of the virtual container VC3 is divided into 21 second sub-buffer areas of the device, and one virtual container VC12 is stored in each second sub-buffer area.
- the SDRAM is a single channel synchronous dynamic random access memory (SDR SDRAM) or a dual channel synchronous dynamic random access memory (DDR SDRAM).
- the present invention also provides an apparatus for improving the efficiency of a virtual cascading delay compensation buffer in a synchronous digital system, the apparatus comprising:
- mapping module configured to map the virtual container VC in a bank of the SDRAM
- a write module configured to write a write request of the SDRAM of the virtual container VC into a write request FIFO register of the corresponding virtual container VC; and write a read request of the SDRAM of the virtual container VC into a corresponding virtual The read request FIFO register of the container VC;
- a polling module is arranged to poll the VC's write request FIFO register and poll the VC's read request FIFO register.
- the number of the virtual containers VC is 4N+4; the number of the banks is 4M+4, where N and M are integers, and N>M.
- mapping module sequentially arranges the virtual containers as the first virtual container VC and the second virtual container VC (4N+4) virtual container VC, and sequentially arranges the banks of the SDRAM into the first bank and the second bank. (4M+4) Bank;
- the first 4M+4 virtual containers VC are respectively stored in the first bank of the SDRAM, the second
- Bank (4M+4) Bank store 2 (4M+4) virtual containers after the first 4M+4 virtual containers in the first bank of the SDRAM, the second bank (4M+4)
- the last 4M+4 virtual containers are respectively stored in the first bank and the second bank (4M+4) Bank of the SDRAM.
- the writing module is configured to arrange the virtual containers in the order of the first virtual container VC and the second virtual container VC (4N+4) virtual container VC, and arrange the banks of the SDRAM into the first bank and the second bank in order. (4M+4) Bank;
- the writing module is further configured to write the SDRAM write request of the first virtual container VC, the (4M+4+1) virtual container VC (4N-4M+1) virtual container VC into the first virtual container VC.
- the SDRAM write request of the virtual container VC is written into the write request FIFO register in the first virtual container VC; ...; will be the (4M+4) virtual container VC, the second (4M+4) The SDRAM write request of the virtual container VC (4N+4) virtual container VC is written into the write request FIFO register in the first virtual container VC;
- the writing module is further configured to write the SDRAM read request of the first virtual container VC, the (4M+4+1) virtual container VC (4N-4M+1) virtual container VC into the first virtual container VC. Read the request FIFO register; the second virtual container VC, the (4M+4+2) virtual container VC
- the SDRAM read request of the virtual container VC is written into the read request FIFO register in the first virtual container VC; ...; will be the (4M+4) virtual container VC, the second (4M+4)
- the SDRAM read request of the virtual container VC (4N+4) virtual container VC is written into the read request FIFO register in the first virtual container VC.
- the present invention also provides an apparatus for improving the efficiency of a virtual cascading delay compensation buffer in a synchronous digital system, the apparatus comprising:
- mapping module configured to map the virtual container VC to the repository bank of the synchronous dynamic random access memory SDRAM;
- Writing a module configured to write a synchronous dynamic random access memory SDRAM write request to the VC write request first-in first-out FIFO register; and writing the synchronous dynamic random access memory SDRAM read request into the VC read request first-in first-out FIFO register;
- a polling module is configured to poll the VC's write request FIFO register and poll the VC's read request FIFO register.
- the VC is a virtual container VC4 in the level 4 STM-4 of the synchronous transmission module.
- the VC4 includes a standard container C4 or three virtual containers VC3.
- the device further includes:
- the first dividing module is configured to divide the buffer area of each of the virtual containers VC4 into three first sub-buffer areas, and one virtual container VC3 is stored in each first sub-buffer area.
- the virtual container VC3 comprises: a standard container C3 or 21 virtual containers VC12, the device further comprising:
- the second partitioning module is configured to divide the buffer area of the virtual container VC3 into 21 second sub-buffer areas of the device, and store a virtual container VC12 in each second sub-buffer area.
- the SDRAM is a single channel synchronous dynamic random access memory (SDR SDRAM) or a dual channel synchronous dynamic random access memory (DDR SDRAM).
- SDR SDRAM single channel synchronous dynamic random access memory
- DDR SDRAM dual channel synchronous dynamic random access memory
- FIG. 1 is a structural block diagram of an existing apparatus for implementing VCAT delay compensation using SDRAM;
- FIG. 2 is a timing diagram of a conventional complete write operation;
- FIG. 3 is a flow chart of a method for improving the efficiency of an SDH virtual concatenation delay compensation buffer according to the present invention
- FIG. 4 is a schematic diagram showing a mapping relationship between a VC and a bank in a SDRAM according to the present invention
- FIG. 5 is a timing diagram of concurrent operations of four banks of the present invention.
- FIG. 6 is a block diagram of a device for improving the efficiency of SDH virtual cascade delay compensation buffer according to the present invention.
- the invention provides a method for delay compensation offset alignment of a VC member of a multipath transmission in a receiving end of a VCG in an SDH device, by establishing a correspondence between a multiplexing path of the VC and a bank storage area in the SDRAM, according to VC
- the multiplexing relationship polls each VC's read and write operation request and dispatches it to the SDRAM controller for processing.
- the SDRAM's different bank area concurrent operation characteristics can be utilized to reduce the useless overhead of the SDRAM operation, thereby improving the SDH virtual cascading delay. Compensation The purpose of saving efficiency.
- each VC4 can be composed of 1
- the C4 container or three VC3 bytes are interleaved and multiplexed, and each VC3 can be composed of one C3 container or 21 VC12 bytes interleaved and multiplexed.
- a flowchart of a method for improving the efficiency of SDH virtual concatenation delay compensation cache according to the present invention includes the following steps:
- the number of VCs is generally 4N+4, where N is an integer.
- the number of banks in the SDRAM may not be four, but 4M+4, where M is an integer. In general, N > M.
- N M.
- the number of VCs may not be an integer multiple of four. If the number of VCs is four or less, four or less VCs may be mapped in four banks of the SDRAM, and some SDRAMs are idle. When the number of VCs is four or more and not an integer multiple of four, the operation can be performed in accordance with the nearest multiple of four, and the excess VC is not used.
- VC4 of the VC described above as an example, but is not limited thereto. If four VC4s are set in this step, they can be represented as VC4#1, VC4#2, VC4#3, and VC4#4 respectively.
- the number of VC4s can be selected according to actual conditions, for example, the number of VC4s. Can be set to 4N+4 (N is a natural number), at this time the VC4 can be represented as VC4#1, VC4#2, VC4#3... VC4# (4N+4), where VC4# ( 4N +4 ) is expressed as 4N+4
- the correspondence between at least four VC4 and four banks in the SDRAM can be established by using address mapping, for example, the virtual container VC4#1 is stored in Bank#1, and the virtual container VC4#2 is stored in Bank#. In 2, the virtual container VC4#3 is stored in Bank#3, and the virtual container VC4#4 is stored in Bank#4. If the number of virtual containers VC4 is set to 4N+4 (N is an integer), the virtual containers VC4#1, VC4#5... ... VC4# ( 4N+1 ) can be stored in Bank#l. , can be a virtual container
- VC4#2, VC4#6... ... VC4# ( 4N+2 ) is stored in Bank#2, and the virtual container VC4#3 can be VC4#7... ... VC4# (4N+3) is stored in Bank#3, can be virtual container VC4#4, VC4#8...
- VC4# (4N+4) is stored in Bank#4. See Figure 4 for details, where N is a natural number.
- each VC4 has three VC3 interleaved multiplexing, and each 21 VC12s in VC3 are interleaved and multiplexed, so that 63 VC12s are multiplexed into one VC4. That is, each VC4 may include one C4 (standard container), or may also include three VC3s, and each VC3 may include one C3 (standard container), or may also include 21 VC12.
- each VC4 buffer can be divided into three parts, one VC3 is stored in each buffer area, and the VC3 buffer area can be divided into 21 parts, one VC12 is stored in each one.
- the buffer area of VC4#1 is divided into three parts, the first VC4 buffer area stores one VC3#1, the second VC4 buffer area stores one VC3#2, and the third VC4 buffer area stores one.
- VC3#3 and also divides the buffer area of VC3#1 into 21 copies, the first VC3 buffer area stores a VC12#1...
- the 21st VC buffer area stores a VC12#21, VC3#2 and VC3
- the setting of #3 is the same as that of VC3#1, and will not be described here, and the other VC4# (4N+4) cases are similar to those set in VC4#1.
- SDRAM can be selected from single channel synchronous dynamic random access memory (SDR SDRAM) or dual channel synchronous dynamic random access memory (DDR SDRAM), but is not limited thereto.
- SDR SDRAM single channel synchronous dynamic random access memory
- DDR SDRAM dual channel synchronous dynamic random access memory
- Step 302 Write an SDRAM read/write request to a VC read/write request FIFO register.
- the SDRAM write and read requests of the respective VCs are respectively written into corresponding request FIFO registers including the write request FIFO register and the read request FIFO register.
- the above correspondence can be understood as that the SDRAM write request of VC4#1 is written to the write request FIFO register in VC4#1, and the SDRAM write request of VC4#2 is written to the write request FIFO register in VC4#2, VC4#
- the SDRAM write request of 3 is written in the write request FIFO register in VC4#3, and the SDRAM write request of VC4#4 is written in the write request FIFO register in VC4#4.
- the SDRAM read request of VC4#1 is written to the read request FIFO register in VC4#1, the SDRAM read request of VC4#2 is written to the read request FIFO register in VC4#2, and the SDRAM read request of VC4#3.
- the SDRAM read request of VC4#4 is written in the read request FIFO register in VC4#4.
- the number of members in VC4 is 4N+4
- the SDRAM write request is written to the write request FIFO register in VC4#1
- the SDRAM write request of VC4#2 is written to the write request FIFO register in VC4#2, and the SDRAM of VC4#3.
- the write request is written to the write request FIFO register in VC4#3, the SDRAM write request of VC4#4 is written to the write request FIFO register in VC4#4, and the SDRAM write request of VC4#5 is written to VC4#1.
- Write request FIFO register, VC4#6 SDRAM write request is written to VC4#2 write request FIFO register..., VC4# (4N+3) SDRAM write request is written to VC4#3
- the write request FIFO register, VC4# (4N+4) SDRAM write request is written to the write request FIFO register in VC4#4.
- Step 303 Polling the read/write request FIFO register of the VC respectively;
- the write request FIFO register can be polled first, and then the read request FIFO register can be polled.
- the read request FIFO register can also be polled first, and then the write request FIFO register can be polled.
- the write request FIFO register in VC4#1 can be polled first, and then the write request FIFO register in VC4#2 can be polled. If three VC3s are set in VC4#1, VC3#1 should be polled in turn.
- the write request FIFO register in VC3#2 and VC3#3 after completing the write request FIFO register in all VC3s in VC4#1, polling the write request FIFO register in VC4#2, if VC4#1 In VC3#1, there are 21 VC12s. After polling all the write request FIFO registers in VC12, poll the write request FIFO register in VC4#2, the processing mode in VC4#2 and VC4#. 1 is the same and will not be described here.
- the operation efficiency of the existing SDRAM is low, mainly due to a row address conflict that may occur in two operations before and after, resulting in an increase in the overhead of row switching. Since SDRAM has four banks in general, four banks can basically realize concurrent operations in its operation timing, and switching between two different banks requires little overhead time. Therefore, it is possible to perform concurrent operations in different bank areas of SDRAM. The characteristics of the work to reduce useless overhead.
- FIG. 5 is a fixed timing operation using four banks concurrently
- the following uses the four VC4s of the STM-4 as an example to illustrate the virtual concatenation delay compensation processing method of the present invention.
- the method includes the following steps:
- Step 1 The first VC4, the second VC4, the third VC4, and the fourth VC4 are respectively stored in 1 ⁇ 4 banks of the DDR SDRAM;
- Step 2 Write four VC4 SDRAM write requests into four VC4 write request FIFO registers, and write four VC4 SDRAM read requests into four VC4 read request FIFO registers; Step 3.
- the scheduler polls in turn. a write request FIFO register of a VC4, a second VC4, a third VC4, and a fourth VC4, and dispatching the write data of the four VC4s to the SDRAM controller for operation; and then polling the first one The read operation of VC4, the second VC4, the third VC4, and the fourth VC4, and the read data of the four CV4s are scheduled to the SDRAM controller for operation. This continues to poll the scheduling operation.
- the present invention also provides an improved synchronization digital system virtual cascading delay A device that compensates for cache efficiency. It should be noted at the outset that the device is provided to implement the steps of the foregoing method, but the present invention is not limited to the following devices, and any device that can implement the above method should be included in the scope of the present invention. And in the following description, the same contents as the foregoing methods are omitted here to save space.
- the block diagram of the device structure for improving the efficiency of the virtual cascading delay compensation cache of the synchronous digital system is as follows:
- mapping module 61 configured to map at least four virtual containers VC in four banks of the synchronous dynamic random access memory SDRAM;
- Writing module 62 configured to write the synchronous dynamic random access memory SDRAM write request to the VC write request first-in first-out FIFO register; to write the synchronous dynamic random access memory SDRAM read request to the VC read request first-in first-out FIFO register Medium; and
- a polling module 63 is arranged to poll the VC's write request FIFO register and poll the VC's read request FIFO register.
- the virtual container VC may use VC4 in the STM-4, and the VC4 includes one C4 or three VC3s.
- the device further includes: a first dividing module, It is arranged to divide the buffer area of each virtual container VC4 into three first sub-buffer areas, and one virtual container VC3 is stored in each first sub-buffer area.
- the virtual container VC3 may include: a C3 or 21 virtual containers VC12, and the device further includes:
- the second dividing module is configured to divide the buffer area of the virtual container VC3 into at least 21 second sub-buffer areas, and each of the second sub-bucket areas stores a virtual container VC12.
- the invention can reduce the useless overhead of the SDRAM operation by utilizing the characteristics of VC multiplexing and the concurrent operation of different bank regions in the SDRAM, thereby improving the efficiency of the SDH virtual cascade delay compensation buffer, and thus has strong industrial applicability. .
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EP09807890.0A EP2320585B1 (en) | 2008-08-20 | 2009-08-20 | Method and apparatus for improving the effect of the synchronous digital hierarchy virtual concatenation delay compensation buffer |
KR1020117006079A KR101228511B1 (ko) | 2008-08-20 | 2009-08-20 | 동기식 디지털 계위 가상 연접 딜레이 보상 버퍼 효율을 향상시키는 방법 및 장치 |
BRPI0917343A BRPI0917343A2 (pt) | 2008-08-20 | 2009-08-20 | metodo e aparelho para melhorar o efeito do armazenamento intermediario do retardo da concatenacao virtual de hierarquia digital sincrona |
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CN2008101186248A CN101656586B (zh) | 2008-08-20 | 2008-08-20 | 提高同步数字体系虚级联延时补偿缓存效率的方法及装置 |
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WO2013029411A1 (zh) * | 2011-09-02 | 2013-03-07 | 中兴通讯股份有限公司 | 一种混合粒度虚级联延时补偿的方法及装置 |
CN110955179B (zh) * | 2019-11-28 | 2022-09-06 | 电子科技大学 | 一种基于pci总线的双通道共享时钟触发调延装置 |
CN111555844B (zh) * | 2020-05-14 | 2023-07-28 | 北京中科网维科技有限公司 | 自动识别vc3/vc4虚级联gfp协议方法及装置 |
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- 2009-08-20 KR KR1020117006079A patent/KR101228511B1/ko active IP Right Grant
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Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
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CN1713602A (zh) * | 2004-06-25 | 2005-12-28 | 中兴通讯股份有限公司 | 提高vc-3和vc-4虚级联延时补偿能力的方法 |
CN1725181A (zh) * | 2004-07-20 | 2006-01-25 | 华为技术有限公司 | 一种sdh类逻辑仿真激励数据缓存方法 |
WO2007024729A2 (en) * | 2005-08-23 | 2007-03-01 | Transwitch Corporation | Methods and apparatus for deskewing vcat/lcas members |
CN1929476A (zh) * | 2005-09-05 | 2007-03-14 | 中兴通讯股份有限公司 | 一种实现无损伤虚级联恢复的方法 |
Also Published As
Publication number | Publication date |
---|---|
CN101656586A (zh) | 2010-02-24 |
RU2465731C1 (ru) | 2012-10-27 |
EP2320585B1 (en) | 2019-02-27 |
EP2320585A1 (en) | 2011-05-11 |
KR101228511B1 (ko) | 2013-01-31 |
KR20110058815A (ko) | 2011-06-01 |
BRPI0917343A2 (pt) | 2015-11-17 |
CN101656586B (zh) | 2013-08-07 |
EP2320585A4 (en) | 2017-05-31 |
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