WO2011097764A1 - 在中继辅助蜂窝网络中进行小区间干扰协调的设备和方法 - Google Patents
在中继辅助蜂窝网络中进行小区间干扰协调的设备和方法 Download PDFInfo
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- WO2011097764A1 WO2011097764A1 PCT/CN2010/000204 CN2010000204W WO2011097764A1 WO 2011097764 A1 WO2011097764 A1 WO 2011097764A1 CN 2010000204 W CN2010000204 W CN 2010000204W WO 2011097764 A1 WO2011097764 A1 WO 2011097764A1
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- 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
- H04W16/10—Dynamic resource partitioning
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- 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
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W84/00—Network topologies
- H04W84/02—Hierarchically pre-organised networks, e.g. paging networks, cellular networks, WLAN [Wireless Local Area Network] or WLL [Wireless Local Loop]
- H04W84/04—Large scale networks; Deep hierarchical networks
- H04W84/042—Public Land Mobile systems, e.g. cellular systems
- H04W84/047—Public Land Mobile systems, e.g. cellular systems using dedicated repeater stations
Definitions
- the present invention relates to interference coordination methods and apparatus in a cellular system, and more particularly to an apparatus and method for inter-cell interference coordination in a relay-assisted cellular network. Background technique
- Multi-hop relay technology has recently been widely discussed in the 3rd Generation Partnership Project Advanced Long Term Evolution (3GPP LTE-A) and Worldwide Interoperability for Microwave Access (WiMAX), both of which select OFDMA as the downlink transmission scheme.
- 3GPP LTE-A 3rd Generation Partnership Project Advanced Long Term Evolution
- WiMAX Worldwide Interoperability for Microwave Access
- each user terminal can access a base station eNode-B (eNB) or a relay node (RN) based on certain UE access principles (e.g., maximum received signal power, minimum distance).
- the link between the eNB and the UE it serves (called a macro UE) is called a direct link; at the relay node (RN) and the UE it serves (called The link between the UEs is called a relay access link; the link between the eNB and its subordinate RN is called a relay backhaul link.
- these three links occupy the entire frequency band of the cell.
- inter-cell interference In a relay enhanced multi-cell communication system, inter-cell interference (ICI) is the primary source of downlink interference.
- Some inter-cell interference coordination (ICIC) techniques based on fractional frequency reuse (FFR) are proposed.
- FFR fractional frequency reuse
- FFR only cell edge UEs (i.e., relay UEs) are allowed to operate on a small portion of all available subbands. The frequency band portion is allocated such that edges of adjacent cells operate on mutually orthogonal frequency bands to avoid inter-cell interference. Since the cell center user is closer to the eNB and thus protected from co-channel interference, the cell center UE (i.e., macro UE) will operate on all or a major portion of the available frequency band without orthogonality restrictions.
- FFR Partial Frequency Multiplexing
- the reuse factor 3 portion of the frequency band is referred to as a cell edge band (using a sub-relay UE), and the reuse factor 1 portion is referred to as a cell center band (for relay backhaul and macro UE).
- Figure 1 shows a schematic diagram of a prior art static ICIC scheme.
- a cell edge band is allocated for the relay UE, and a cell center band is allocated for the macro UE, and the relay backhaul link can share the cell edge band with the relay UE or share the cell center band with the macro UE.
- the cell served by the eNB includes three sectors 0, 1, and 2, the cell edge band F0 is allocated to the relay UE of sector 0, and the cell edge band F1 is allocated to the relay UE of sector 1 as a fan.
- the relay UE of the area 2 allocates the cell edge frequency band F2; and allocates the cell central frequency band F3 for the macro UEs of the sectors 0, 1, and 2.
- the frequency bands F0, F1, F2, and F3 are orthogonal to each other.
- Figure 2 shows a typical LTE FDD downlink frame structure.
- each downlink frame is 10 ms long and consists of 20 (from 0 to 19) time slots of length 0.5 ms.
- a subframe is defined as consecutive slots, where subframe i consists of slots 2i and 2i+1.
- PRBs physical resource blocks
- Fig. 3 shows a resource distribution diagram of the static ICIC scheme in the case of the frame structure shown in Fig. 2.
- the relay UEs of sectors 0, 1, and 2 are each allocated 6 PRBs, that is, the sector edge bands F0 (corresponding to PRB 1-PRB 6) are allocated for sectors 0, 1, and 2, respectively.
- the present invention proposes an apparatus and method for performing inter-cell interference coordination ICIC in a relay assisted cell.
- an apparatus for performing inter-cell interference coordination ICIC in a relay assisted cell includes: a relay overload determining apparatus, for a sector served by the apparatus, according to the sector The load information of the adjacent sector is determined to be a relay overload of the sector or a relay overload of a neighboring sector of the sector; a relay resource borrowing device if an adjacent fan relative to the sector The relay of the sector is overloaded, so that the sector borrows the relay resources released by the adjacent sectors of the sector; the relay resource release device, if relative to the sector The relay of the adjacent sector of the sector is overloaded, and according to the load signal of the adjacent sector Information to release the relay resources that have been allocated for the sector.
- the relay overload determining apparatus may include: a resource distribution density calculating unit, calculating a resource distribution density in the sector and two types of neighbors of the sector according to load information of adjacent sectors of the sector Average resource distribution density of the sector; a relay overload determining unit that compares the calculated resource distribution density in the sector with an average resource distribution density in any of the adjacent sectors, if the fan If the distribution density of the relay resources in the area is smaller than the average resource distribution density of the adjacent sectors of the sector, determining that the sector is overloaded with respect to the adjacent sectors of the type, if If the distribution density of the relay resources in the sector is greater than the average resource distribution density of the adjacent sectors of the sector, then it is determined that the relay of the adjacent sectors is overloaded with respect to the sector.
- m' m' ⁇ 2
- i denotes sector i
- k' denotes neighbor cell k' of cell k
- i' denotes adjacent sector of sector i
- subscripts 1 and 2 of i' denote adjacent sectors of sector i, respectively
- the two categories of i', f ki denote the total number of PRBs allocated for the relay user equipment UE in the cell k sector i
- N ki denote the number of relay UEs in the cell k sector i.
- the number of relay resources that have been allocated for the sector can be calculated by the formula "' I kl ki I ).
- the relay resource borrowing device may include: a borrowing condition determining unit that determines whether the adjacent sector of the sector is overloaded in a case where the relay of the sector is overloaded with respect to any type of adjacent sectors of the sector The common relay resource is released, and the relay resource borrowing unit causes the sector to borrow the adjacent sector of the sector in the case where the adjacent sector releases the common relay resource.
- the common relay resources that are released may include: a borrowing condition determining unit that determines whether the adjacent sector of the sector is overloaded in a case where the relay of the sector is overloaded with respect to any type of adjacent sectors of the sector.
- the load information may include a number of connected UEs, an overload indication 01, a high interference indication ⁇ , and a relative narrowband transmission power indication RNTP;
- the relay resource may be a physical allocated for a relay UE in a sector. Resource block PRB.
- a method for inter-cell interference coordination ICIC in a relay assisted cell comprising the steps of: for one sector, according to load information of adjacent sectors of the sector Determining whether the relay overload of the sector is a relay overload of a neighboring sector of the sector; if the relay of the sector is overloaded with respect to an adjacent sector of the sector, The sector borrows a relay resource released by an adjacent sector of the sector; if the relay of the adjacent sector of the sector is overloaded with respect to the sector, according to the neighbor The load information of the sector releases the relay resources that have been allocated for the sector.
- the determining, based on the load information of the neighboring sectors of the sector, whether the relay of the sector is overloaded or the relay of the sector of the sector is overloaded may include: according to the sector Load information of adjacent sectors to calculate a resource distribution density in the sector and an average resource distribution density of two types of adjacent sectors of the sector; a calculated resource distribution density in the sector Comparing with an average resource distribution density in any of the adjacent sectors, if the distribution density of the relay resources in the sector is less than the average resource distribution density of the adjacent sectors of the sector, Determining a relay overload of the sector relative to the neighboring sectors of the type, if the distribution density of the relay resources in the sector is greater than the average resource distribution density of the adjacent sectors of the sector, Then, it is determined that the relay of the adjacent sector is overloaded with respect to the sector.
- the resource distribution density of the sector may be calculated by the following formula:
- the average resource distribution density of the adjacent sectors can be calculated by the following formula:
- k denotes the cell k
- i denotes sector 1
- k' denotes the neighboring cell k' of the cell k
- ⁇ 'and i 2 ' respectively represent two types of adjacent sectors of the sector i
- f ki denotes a cell k fan
- the total number of PRBs allocated to the relay UE in the area i, and N ki represents the number of relay UEs in the sector k sector i.
- the step of using the relay resources released by the adjacent sectors of the sector may include: in the case of a relay overload of the sector with respect to any type of adjacent sectors of the sector, Determining whether the neighboring sectors release a common relay resource, and if the neighboring sectors release a common relay resource, causing the sector to borrow the neighbor of the sector The common relay resource released by the sector.
- the load information includes a number of connected UEs, an overload indication 01, a high interference indication ⁇ , and a relative narrowband transmission power indication R TP ;
- the relay resource is a physical resource block PRB allocated for a relay UE in a sector.
- the present invention proposes a comparison with the conventional static ICIC scheme in which the cell edge band is equally distributed among adjacent cells.
- a resource allocation scheme for adaptive dynamic ICIC among adjacent cells can greatly improve spectral efficiency.
- Figure 1 shows a schematic diagram of a prior art static ICIC scheme
- Figure 2 shows a typical LTE FDD downlink frame structure
- FIG. 3 shows resource allocation of a prior art static ICIC scheme in the case of the frame structure shown in FIG. 2;
- FIG. 4 shows a block diagram of a structure of an inter-cell interference coordination apparatus 400 according to an exemplary embodiment of the present invention;
- 5 shows a layout of a multi-cell with relays and corresponding resource allocation according to an embodiment of the present invention;
- FIG. 6 is a flow chart showing a dynamic inter-cell interference coordination ICIC scheme according to an embodiment of the present invention in the multi-cell layout shown in FIG. 5;
- Figures 7a and 7b illustrate resource allocation for a dynamic ICIC scheme in accordance with an embodiment of the present invention in the case of the frame structure shown in Figure 2;
- Figures 8a and 8b illustrate another resource allocation of a dynamic ICIC scheme in accordance with an embodiment of the present invention in the case of the frame structure shown in Figure 2;
- Figure 9 illustrates performance evaluation of the method and apparatus of the present invention in a wireless cellular system.
- Embodiments of the present invention propose a new dynamic inter-cell interference coordination ICIC scheme for a relay-assisted pinhole network.
- the basic idea of the embodiment of the present invention is: for each sector of a cell, according to the distribution of the relay UE in the adjacent sector of the sector, the dynamic between the cell and the neighboring cell of the cell
- the coordination is to allocate resources, that is, physical resource blocks (PRBs), to relay UEs in each sector.
- PRBs physical resource blocks
- FIG. 4 shows a block diagram of a structure of an inter-cell interference coordination apparatus 400 according to an exemplary embodiment of the present invention.
- the inter-cell interference coordination device 400 may be implemented by an eNB, and the inter-cell interference coordination device 400 may include: a relay overload determining device 401, for a fan served by the device And determining, according to load information of adjacent sectors of the sector (for example, the number of connected UEs, the overload indication 01, the high interference indication ⁇ , and the relative narrowband transmission power indication RNTP), determining that the sector is a relay
- the overload is also a relay overload of the adjacent sectors of the sector; the relay resource borrowing device 402, if the relay of the sector is overloaded with respect to adjacent sectors of the sector,
- the sector borrows a relay resource released by a neighboring sector of the sector (the relay resource may refer to a physical resource block PRB allocated to a relay UE in a sector, that is, a cell edge band); And a relay resource releasing means
- the relay overload determining apparatus 401 may include: a resource distribution density calculating unit 4011, calculating a resource distribution density in the sector and two types of neighbors of the sector according to load information of neighboring sectors of the sector The average resource distribution density of the sector; the relay overload determining unit 4012 compares the calculated resource distribution density in the sector with the average resource distribution density in any of the adjacent sectors, if If the distribution density of the relay resources in the sector is smaller than the average resource distribution density of the adjacent sectors of the sector, it is determined that the relay of the sector is overloaded with respect to the adjacent sectors of the type. If the distribution density of the relay resources in the sector is greater than the average resource distribution density of the adjacent sectors of the sector, it is determined that the relay overload of the adjacent sectors is relative to the sector.
- the relay resource borrowing means 402 includes: a borrowing condition determining unit 4021, determining that the adjacent sectors of the sector are overloaded in the case where the relay of the sector is overloaded with respect to any type of adjacent sectors of the sector Whether released a common a relay resource borrowing unit 4022, in the case where the adjacent sector releases the common relay resource, the sector is released by borrowing the adjacent sector of the sector Common relay resources.
- the resource distribution density of the sector can be calculated by using formula (1):
- the average resource distribution density of two types of adjacent sectors of the sector can be calculated by equations (2) and (3):
- k denotes the cell k
- i denotes the sector i
- k denotes the neighboring cell k' of the cell k
- i' denotes the adjacent sector of the sector i
- the subscripts 1 and 2 of i' denote the sector i, respectively
- Two categories of adjacent sectors i', f ki denotes the total number of PRBs allocated for the relay user equipment UE in the cell k sector i
- N ki denotes the number of relay UEs in the sector k sector i.
- the number of released relay resources allocated for the sector can be calculated by equation (4)
- each of the components shown in FIG. 4 can be implemented by a plurality of devices in practical applications, and the illustrated components are also used in practical applications. Can be integrated in a chip or a device.
- the eNB may also include any unit and unit for other purposes.
- an inter-cell interference coordination method will be described below with reference to FIG. 5-8.
- an LTE FDD downlink transmission is taken as an example. It will be appreciated that the invention is not limited thereto but may be applied to other wireless fields.
- Fig. 5 schematically shows the layout of a multi-cell with relays and corresponding resource allocation.
- four eNBs are shown in the layout, and are numbered as eNB1, eNB2, eNB3, and eNB4, respectively.
- the cell k served by the eNBk includes three sectors 0, 1, and 2, and the cell edge band Fk0 is allocated to the relay UE of sector 0 as a fan.
- the relay UE of the area 1 allocates the cell edge frequency band Fk1, allocates the cell edge frequency band Fk2 for the relay UE of the sector 2, and allocates the cell central frequency band F3 for the macro UE of the sector 0, 1, and 2.
- FIG. 6 is a flow chart showing a dynamic inter-cell interference coordination ICIC scheme according to an embodiment of the present invention in the multi-cell layout shown in FIG.
- Figures 7a and 7b illustrate resource allocation for a dynamic ICIC scheme in accordance with an embodiment of the present invention in the case of the frame structure shown in Figure 2.
- step 601 initializing cell resource allocation is performed. Similar to FIG. 3, for eNBk, six PRBs can be allocated for each of the relay UEs of sectors 0, 1, and 2, that is, the cell edge band FkO is allocated for sectors 0, 1, and 2, respectively (corresponding to PRB 1 -PRB 6 ), Fkl (corresponding to PRB7-PRB 12 ) and Fk2 (corresponding to PRB 13-PRB18 ); allocating 32 PRBs for macro UEs of sectors 0, 1 and 2, ie, allocating the cell central frequency band F3 (corresponding PRB) 19-PRB 50).
- sector 0, sector 1, and sector 2 may be referred to as three types of sectors.
- step 602 for one sector, determining whether the relay overload of the sector or the relay of the adjacent sector of the sector is overloaded according to load information of neighboring sectors of the sector; If the relay of the sector is overloaded in the adjacent sector of the sector, step 603 is performed; if the relay of the adjacent sector of the sector is overloaded with respect to the sector, Go to step 604.
- this step is explained by taking the sector 0 of the eNB3 (the sector in the center of Fig. 5) as an example.
- This sector 0 is adjacent to sector 2 of eNB1, sectors 1 and 2 of eNB2, and sector 1 of eNB4.
- the eNB3 communicates with the eNB1, the eNB2, and the eNB4 through the X2 interface, and determines the relay overload condition of the sector based on the load information about the neighboring sectors from the neighboring eNBs:
- eNB3 may calculate the resource distribution density m ki of sector 0 of eNB3 according to formula (1), that is, the number of PRBs allocated for each relay UE in the sector 0.
- eNB3 can calculate the average resource distribution density ⁇ and ⁇ of the two types of adjacent sectors of the sector 0 according to formulas (2) and (3).
- ⁇ represents the average resource distribution density of a class of sectors around sector i
- ⁇ represents the average resource distribution density of another type of sector around sector i.
- ⁇ represents the average resource distribution density of three sectors 1 (sectors directly above, lower left, and lower right in FIG. 5) around the sector 0.
- ⁇ Indicates the average resource distribution density of three sectors 2 (sectors directly below, upper left, and upper right in Fig. 5) around the sector 0.
- step 603 it is determined that the relay of the sector i is overloaded, and step 603 is performed; if w > ⁇ , it is determined that the relay of the sector i' is overloaded, and step 604 is performed.
- step 603 If the relay of the three sectors 1 is overloaded with respect to sector 0, step 604 is performed.
- the sector is caused to borrow the relay resources released by the adjacent sectors of the sector.
- the relay of the sector 0 can borrow the PRB7, that is, Use PRB7 that these three sectors 1 are no longer used.
- the resource allocation changes from the initial state of Fig. 7a to the post-coordination state of Fig. 7b.
- the relay resource allocated for the sector is released according to the load information of the adjacent sector.
- the resources of the two PRBs ie, PRB5 and PRB6, are borrowed for the relay of these three sectors.
- the eNB 3 completes the processing of one sector in the eNB 3 by coordinating with three eNBs adjacent thereto.
- the eNB 3 can also perform the above processing for its sectors 1 and 2, respectively.
- Figures 8a and 8b illustrate another resource allocation for a dynamic ICIC scheme in accordance with an embodiment of the present invention in the case of the frame structure shown in Figure 2.
- Figures 8a and 8b for example, if sector 1 is overloaded, it is determined whether three sectors 0 around the sector 1 have released a common PRB, and whether three sectors 2 around the sector 1 are A common PRB is also released. In the present embodiment, it is assumed that all three sectors 0 have released a common PRB6, and three sectors 2 have released a common PRB 13 and 14, and sector 1 borrows PRB 6 and PRBs 13 and 14.
- the resource allocation changes from the initial state of Fig. 8a to the state of Fig. 8b.
- sector 2 can be subjected to corresponding calculations and decisions to coordinate resource allocation.
- eNB3 can implement processing of the three sectors of eNB3.
- each eNB performs the same processing as eNB3, so that each eNB constantly coordinates with its neighboring 6 eNBs to dynamically allocate resources for relay UEs in the respective sectors.
- Table 1 below gives the parameters used in the simulation of the wireless cellular system using the method and apparatus of the present invention.
- Cellular layout ⁇ wrap around hexagonal layout, 7 base stations eNodeB, 3 base stations per base station eNodeB
- ISD Inter-site 500 m (3GPP Case 1 ) Distance, base station
- Downlink HARQ has CC (Chasing Combing, Chase merge) asynchronous state, maximum triple retransmission, and hop-by-hop HARQ in the relay network
- CC Chosing Combing, Chase merge
- Base station eNodeB Day 1 transmit antenna with antenna pattern defined in 3GPP TS 36. 814 VI.5.1
- User terminal UE day 2 receive antennas (0 dBi antenna gain, omnidirectional) downlink receiver MRC (maximum merge ratio)
- Path PL L JR 103. 4+24. 21ogl0 (R)
- Prob ⁇ is based on the ITU model: Case 1:
- the distribution of the UE is set to be non-uniform, and the distribution varies randomly for each time period. It can be seen from the simulation results that the cell average and cell edge spectral efficiency are improved by the method proposed by the embodiment of the present invention.
- Figure 9 illustrates performance evaluation of the method and apparatus of the present invention in a wireless cellular system. It can be seen from Fig. 9 that the dynamic ICIC scheme proposed by the embodiment of the present invention has greatly improved in performance compared with the conventional static ICIC scheme.
- the resource waste caused by the uneven distribution of the relay UE or the movement of the relay UE is greatly improved.
- some embodiments also include a program storage device (eg, a digital data storage medium) that is readable by a machine or a computer, and program instructions executable by the machine or executable by the computer, wherein The instruction performs some or all of the steps of the above method.
- the program storage device can be a digital memory, a magnetic storage medium (such as a magnetic disk and magnetic tape), a hardware or an optically readable digital data storage medium.
- Embodiments also include a computer that executes a program recorded on a storage medium to perform the steps of the above method.
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Priority Applications (7)
Application Number | Priority Date | Filing Date | Title |
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EP10845438.0A EP2536192A4 (en) | 2010-02-12 | 2010-02-12 | EQUIPMENT AND METHOD FOR COORDINATING INTERCELLULAR INTERFERENCE IN A SUPPORTIVE RELAYS MOBILE NETWORK |
PCT/CN2010/000204 WO2011097764A1 (zh) | 2010-02-12 | 2010-02-12 | 在中继辅助蜂窝网络中进行小区间干扰协调的设备和方法 |
JP2012552223A JP5749742B2 (ja) | 2010-02-12 | 2010-02-12 | 中継支援セルラ・ネットワークにおけるセル間干渉調整のためのデバイスおよび方法 |
CN201080055112.7A CN102652441B (zh) | 2010-02-12 | 2010-02-12 | 在中继辅助蜂窝网络中进行小区间干扰协调的设备和方法 |
KR1020127023593A KR20120116016A (ko) | 2010-02-12 | 2010-02-12 | 중계 보조 셀룰러 네트워크에서의 셀간 간섭 조정을 위한 장비 및 방법 |
BR112012020098A BR112012020098A2 (pt) | 2010-02-12 | 2010-02-12 | dispositivo e método para coordenação de interferência inter células em rede celular assistida por relé. |
US13/578,202 US9107068B2 (en) | 2010-02-12 | 2010-02-12 | Device and method for inter-cell interference coordination in relay-assistant cellular network |
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PCT/CN2010/000204 WO2011097764A1 (zh) | 2010-02-12 | 2010-02-12 | 在中继辅助蜂窝网络中进行小区间干扰协调的设备和方法 |
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KR (1) | KR20120116016A (zh) |
CN (1) | CN102652441B (zh) |
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- 2010-02-12 JP JP2012552223A patent/JP5749742B2/ja not_active Expired - Fee Related
- 2010-02-12 KR KR1020127023593A patent/KR20120116016A/ko not_active Application Discontinuation
- 2010-02-12 EP EP10845438.0A patent/EP2536192A4/en not_active Withdrawn
- 2010-02-12 US US13/578,202 patent/US9107068B2/en not_active Expired - Fee Related
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Also Published As
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CN102652441A (zh) | 2012-08-29 |
CN102652441B (zh) | 2015-03-11 |
JP2013520040A (ja) | 2013-05-30 |
JP5749742B2 (ja) | 2015-07-15 |
BR112012020098A2 (pt) | 2018-03-20 |
EP2536192A1 (en) | 2012-12-19 |
EP2536192A4 (en) | 2014-11-26 |
KR20120116016A (ko) | 2012-10-19 |
US9107068B2 (en) | 2015-08-11 |
US20120315840A1 (en) | 2012-12-13 |
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