WO2013136951A1 - A method of providing control information for user equipment - Google Patents
A method of providing control information for user equipment Download PDFInfo
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- WO2013136951A1 WO2013136951A1 PCT/JP2013/054642 JP2013054642W WO2013136951A1 WO 2013136951 A1 WO2013136951 A1 WO 2013136951A1 JP 2013054642 W JP2013054642 W JP 2013054642W WO 2013136951 A1 WO2013136951 A1 WO 2013136951A1
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- cce
- pdcch
- res
- base station
- size
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Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/24—Radio transmission systems, i.e. using radiation field for communication between two or more posts
- H04B7/26—Radio transmission systems, i.e. using radiation field for communication between two or more posts at least one of which is mobile
- H04B7/2612—Arrangements for wireless medium access control, e.g. by allocating physical layer transmission capacity
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/003—Arrangements for allocating sub-channels of the transmission path
- H04L5/0048—Allocation of pilot signals, i.e. of signals known to the receiver
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/003—Arrangements for allocating sub-channels of the transmission path
- H04L5/0053—Allocation of signaling, i.e. of overhead other than pilot signals
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/20—Control channels or signalling for resource management
Definitions
- the present invention relates to a method of providing control information for User Equipment (UEs) in data communication, and in particular to using enhanced physical downlink control channels (E-PDCCH) for configuring the UEs.
- UEs User Equipment
- E-PDCCH enhanced physical downlink control channels
- an eNodeB in the LTE system determines which User Equipment (UE) in the system should be granted uplink resources for data transmission and which UE should be scheduled for data reception in the downlink, and then provides suitable control information for the UEs accordingly.
- the eNodeB determines an amount of control channel resources of a Physical Downlink Control Channel (PDCCH) that is required and supported for the UEs comprising this control information.
- PDCCH Physical Downlink Control Channel
- One aspect of the invention provides a method of providing control information for UEs in data communication with an eNodeB over a Long Term Evolution (LTE) wireless
- E-PDCCH Enhanced-Physical Downlink Control Channel
- E-PDCCH mapping the at least one E-PDCCH on at least one allocated pair of Physical Resource Blocks (PRBs) according to an Enhanced-Control Channel Element (E-CCE) structure including a variable number of Resource Element Groups (REGs) ;
- E-CCE Enhanced-Control Channel Element
- each E-CCE structure has a size of 3, 4, 5, 6, 9, 10, 11, 12, 14 or 16 REGs or equivalently 12, 16, 20, 24, 36, 40, 44, 48, 56 or 64 Resource Elements (REs).
- REs Resource Elements
- the E-CCE structure size can vary on a pair of PRBs or group of pairs of PRBs within a sub-frame.
- the size of the E-CCE structure may be determined at the eNodeB by:
- step (1) number of REs available for E-PDCCH or multiplexed E-PDCCHs mapping in the step (1), divided by the maximum possible aggregation level in step (4) a. in number of REs, c. selecting the E-CCE structure size with the smallest remainder,
- the size of the E-CCE structure may be determined at the
- step (1) number of REs available for E-PDCCH or multiplexed E-PDCCHs mapping in the step (1), divided by the maximum possible aggregation level in step (4) a. in number of REs,
- step (1) using the E-CCE structure size selected in step (1).
- Another aspect of the invention provides a UE in data communication with an eNodeB over a Long Term Evolution (LTE) wireless communication system, the UE comprising:
- a controller configured to:
- E-PDCCH Enhanced-Physical Downlink Control Channel
- PRBs Physical Resource Blocks
- E-CCE Enhanced-Control Channel Element
- REGs Resource Element Groups
- Yet another aspect of the invention provides an eNodeB in data communication with UEs over a Long Term Evolution (LTE) wireless communication system, the eNodeB
- LTE Long Term Evolution
- a controller configured to:
- E-PDCCH comprising control information for configuring the UEs to communicate data with the eNodeB over the LTE wireless communication system, the at least one E-PDCCH being mapped on at least one allocated pair of Physical Resource Blocks (PRBs) according to an Enhanced-Control Channel Element (E-CCE) structure including a variable number of Resource Element Groups (REGs);
- E-CCE Enhanced-Control Channel Element
- Futher aspect of the invention provides a method of providing control information for user equipments (UEs) in communication with a base station over a wireless communication system.
- This method includes: mapping at least one enhanced-physical downlink control channel (E-PDCCH) on at least one allocated pair of physical resource blocks (PRBs) according to an enhanced-control channel element (ECCE) structure including a variable number of resource element groups (REGs); and varying the number of REGs in an E-CCE structure.
- E-PDCCH enhanced-physical downlink control channel
- PRBs physical resource blocks
- ECCE enhanced-control channel element
- REGs resource element groups
- This method may further includes: encoding the at least one EPDCCH comprising control information for configuring the UEs to communicate with the base station over the wireless communication system; and communicating the at least one E-PDCCH mapped onto the at least one allocated pair of PRBs to the UEs so that the UEs can be configured to communicate over the wireless communication system based on the control information.
- each E-CCE structure may have a size of 3, 4, 5, 6, 9, 10, 11 , 12, 14 or 16 REGs.
- each E-CCE structure may have a size of 12, 16, 20, 24, 36, 40, 44, 48, 56 or 64 resource elements (REs).
- REs resource elements
- the number of REGs may vary from sub-frame to sub-frame.
- the number of REGs may vary within a subframe.
- the size of the E-CCE structure may be determined at the base station by:
- step (1) number of REs available for E-PDCCH or multiplexed E-PDCCHs mapping in the step (1), divided by the maximum possible aggregation level in step (4) a. in number of REs,
- the size of the E-CCE structure may be determined at the UE by:
- step (1) using the E-CCE structure size selected in step (1).
- Another aspect of the invention provides a base station in communication with a user equipment (UE) over a wireless communication system, this base station includes: a mapping unit to map at least one enhanced-physical downlink control channel (E-PDCCH) on at least one allocated pair of physical resource blocks (PRBs) according to an enhanced-control channel element (E-CCE) structure including a variable number of resource element groups (REGs).
- E-PDCCH enhanced-physical downlink control channel
- PRBs physical resource blocks
- E-CCE enhanced-control channel element
- the base station varies the number of REGs in an E-CCE structure.
- This base station may, further include: a transmitting unit to transmit the at least one EPDCCH comprising control information.
- the UE is configured for communicating with the base station over the wireless communication system based on the control information.
- a user equipment in communication with a base station over a wireless communication system.
- This UE includes: a controller configured to: receive at least one enhanced-physical downlink control channel (EPDCCH) comprising control information for configuring the UEs to communicate with the base station over the wireless communication system, the at least one E-PDCCH being mapped on at least one allocated pair of physical resource blocks (PRBs) according to an enhanced-control channel element (E-CCE) structure including a variable number of resource element groups (REGs). The number of REGs in an E-CCE structure is varied by the base station.
- E-CCE enhanced-control channel element
- REGs resource element groups
- PRBs physical resource blocks
- ECE enhanced-control channel element
- REGs resource element groups
- This method may, further include: encoding the at least one EPDCCH comprising control information for configuring the UEs to communicate with the base station over the wireless communication system; and communicating the at least one E-PDCCH mapped onto the at least one allocated pair of PRBs to the UEs so that the UEs can be configured to communicate over the wireless communication system based on the control information.
- Yet another aspect of the invention provides a method implemented in a user equipment (UE).
- This method includes: receiving at least one enhanced-physical downlink control channel (EPDCCH) comprising control information for configuring the UEs to communicate with the base station over the wireless communication system, the at least one E-PDCCH being mapped on at least one allocated pair of physical resource blocks (PRBs) according to an
- EDCCH enhanced-physical downlink control channel
- PRBs physical resource blocks
- E-CCE enhanced-control channel element
- REGs resource element groups
- Fig. 1 is a schematic illustration of a Long Term Evolution (LTE) wireless communication system according to an embodiment of the present invention.
- LTE Long Term Evolution
- Fig. 2 is a flow chart illustrating encoding E-PDCCH according to an embodiment of the present invention.
- Fig. 3 is a graphical representation of an E-CCE of size 36 REs mapping on an allocated PRB pair.
- Fig. 4 is a graphical representation of an E-CCE of size 12 REs mapping on an allocated PRB pair.
- Fig. 5 is a graphical representation of an E-CCE aggregation for E-CCE size of 12 REs.
- Fig. 6 is a graphical representation of an E-CCE of size 20 REs mapping on an allocated PRB pair.
- Fig. 7 is a graphical representation of an E-CCE aggregation for E-CCE size of 20 REs.
- Fig. 8 is a graphical representation of different E-PDCCH configurations on the same subframe which requires different E-CCE sizes.
- Fig. 9 is a flow chart showing steps involved in implementing the calculation of an optimized E-CCE size at an eNodeB.
- Fig. 10 is a flow chart showing steps involved in implementing the calculation of an optimized E-CCE size at a UE.
- Fig. 11 is a graphical representation of a first example of spatial multiplexing of different composite control information with the same modulation schemes.
- Fig. 12 is a graphical representation of a second example of spatial multiplexing of different composite control information with the different modulation schemes.
- CCEs Control-Channel Elements
- REG resource-element groups
- the number of CCE(s) - namely one, two, four, or eight - required for a certain PDCCH depends on the payload size of the control information (DCI payload) and the channel-coding rate. This is used to realised link adaptation for the PDCCH. If the channel conditions for the terminal to which the PDCCH is intended are disadvantageous, a larger number of CCEs needs to be used compared to the case of advantageous channel conditions.
- the number of CCEs used for a PDCCH is also referred to as the aggregation level.
- the number of CCEs available for PDCCHs depends on the size of the control region, the cell bandwidth, the number of downlink antenna ports, and the amount of resources occupied by PHICH.
- the sizes of the control region can vary dynamically from sub-frame to sub-frame, whereas other quantities are semi-statically configured.
- the number of useful RE(s) available for E-PDCCH(s) depends on the size of the control region, the number of allocated PRB pair(s), location of PRB pair(s) (i.e. central 6 or 7 PRBs or other), sub-frame number (i.e. sub-frame #0, 5 or special sub-frame in case of type 2 sub-frame or other sub-frames), the number of CRS configuration, UE specific RS configuration, CSI-RS configuration, and sub-frame's type (i.e. normal CP or extended CP).
- control region can vary dynamically from sub-frame to sub-frame, whereas other quantities are semi-statically configured but can also affect the number useful RE(s) available for E-PDCCH(s) mapping sub-frame by sub-frame due to the CSI-RS appearing periodically, REs reserved for PBCH, PSS, SSS, PRS and/or special sub-frame in case of type-2 frame structure. This leads to the ineffective usage of the available channel resources if the same CCE size (i.e. 9 REGs) as the legacy PDCCH is used.
- the used RE(s) are not actually located at the end of sub-frame but are distributed around the allocated PBRs pair after the interleaving function 380 of E-PDCCH coding structure shown in Fig. 2, in the case
- Control region size is 2 OFDM symbols
- 3 1 Pair of PRBs is allocate for a E-PDCCH within the central 72 sub carrier
- Sub-frame number is not 0 or 5 or special sub-frame in case of type-2 frame structure.
- the maximum aggregation level of 8 with possible aggregation levels of 4 and 8 in case of E-PDCCH(s) is QPSK modulated with the assumption that the current ambiguous sizes of information bit of 12, 14, or 16 is used as being illustrated in the lower parts of Fig. 5. That provides better link adaptation in term of different aggregation level.
- multiple E-PDCCH(s) with the same modulation level can be multiplexed and utilised all available REs with possible aggregation levels of ⁇ 2, 4, 8 ⁇ . This illustrated in Fig. 5 for 16-QAM and 64-QAM modulated E-PDCCH(s).
- the maximum aggregation level of 4 with no other possible aggregation levels in case of E-PDCCH(s) is QPSK modulated as being illustrated in the upper part of Fig. 7.
- QPSK modulated As being illustrated in the upper part of Fig. 7.
- E-PDCCH(s) with the same modulation level can be multiplexed and utilised all available REs with possible aggregation levels of ⁇ 1, 2, 4 ⁇ . This is illustrated in the lower parts of Fig. 7 for 16-QAM and 64-QAM modulated E-PDCCH(s).
- the present invention proposes a set of different E-CCE sizes to be used for E-PDCCH, as well as a method for calculating and selecting of appropriate E-CCE sizes on a sub-frame basis for implementation at the eNodeB and UEs so that there is no need to use signalling to inform a UE of the configured E-CCE size used at its eNodeB.
- E-PDCCH is but not limited to ⁇ 3, 4, 5, 6, 9, 10, 11, 12, 14, 16 ⁇ REGs or being equivalent to ⁇ 12, 16, 20, 24, 36, 40, 44, 48, 56, 64 ⁇ REs.
- FIG. 1 An LTE wireless communication system 100 supporting E-PDCCH with variable E-CCE size is illustrated in Fig. 1.
- the wireless system 100 comprises an eNodeB 110 for encoding control information and transmission of E-PDCCH(s) to an intended UE 150 via wireless channel using a. implemented E-PDCCH encoding function 1 12 to encode the transmitted control information,
- E-CCE size calculation function 111 to derive optimum E-CCE size for link adaptation
- E-PDCCH(s) physical channel processing function 1 15 to perform layer mapping, pre-coding and E-PDCCH(s) RE mapping on allocated PRB pairs for transmitting E-PDCCHs. Furthermore, the eNodeB can map E-PDCCH(s) with different configurations targeting different group of UEs or group of
- E-PDCCHs to maximise channel condition, link adaptation, and beamforming as well as performance target as being illustrated in Fig. 8.
- E-PDCCH channel coding and physical channel coding (300) is further illustrated in Fig. 2.
- the exemplary eNodeB implemented E-PDCCH(s) physical channel processing function 115 has spatial multiplexing of composite control information stream with same or different modulation schemes for multi-layers transmission and precoding as being illustrated in Figs. 11 and 12 respectively.
- the wireless system 100 further comprises a UE 150 for performing the reception, detection and decoding of its indented E-PDCCH(s) using E-PDCCH(s) reception function 153, E-CCE size calculation function 151, and E-PDCCH(s) blind decoding function 152.
- the eNodeB implemented E-CCE size calculation function is further described in the following steps with the summarised procedure specified in Fig. 9.
- UE(s) belonging to an eNodeB are geometrically distributed and therefore different configurations for a UE or group of UE(s) can improve the E-PDCCH(s) demodulation performance.
- This also requires different E-CCE sizes to be used for each UE or group of UE(s) which shares the same allocated PRB pairs for E-PDCCH(s) RE(s) mapping and/or beam forming configuration.
- the eNodeB calculates E-CCE sizes for all possible size of control region and sub-frame with and without CSI-RS using the following steps:
- the eNodeB uses the calculated E-CCE size corresponding to the dynamically configured control region size with or without CSI-RS for the E-PDCCH encoding, E-CCEs aggregation and E-PDCCH(s) multiplexing. These eNodeB calculated E-CCE size(s) will be valid until the set of semi-static parameters being reconfigured and activated or number of allocated PRB-pairs has been changed and become effective.
- the UE(s) implements the procedure for calculating E-CCE sizes described in the following steps with the summarised procedure specified in Fig. 10.
- an eNodeB can configure a UE to monitor different set of allocated PRB pairs for different E-PDCCH(s) configurations as being illustrated in Fig. 8. This also requires different E-CCE sizes to be used for each E-PDCCH
- E-PDCCH configurations that a UE is configured to monitor For each E-PDCCH configurations that a UE is configured to monitor the UE calculates E-CCE sizes for all possible sizes of control region and sub-frame with and without CSI-RS, using the following steps:
- the UE will use the calculated E-CCE size corresponding to the dynamically detected control region size and with or without CSI-RS for the E-PDCCH(s) reception and E-PDCCH(s) blind decoding for its intended control information. These UE's calculated E-CCE size(s) will be valid until the set of semi-static parameters being reconfigured and activated or number of allocated PRB-pairs has been changed and become effective.
- E-PDCCH E-CCE sizes can be selected and configured by eNodeB to
- Procedures are implemented by the eNodeB for calculating optimised E-CCE sizes and applying the calculated E-CCE on subframe basis without notifying UE.
- Procedures are implemented by the UE for calculating optimised E-CCE sizes used by eNodeB and applying the correct E-CCE used by eNodeB on sub-frame by sub-frame basis and E-PDCCH configuration by E-PDCCH configuration basis without signalling.
- E-PDCCH(s) are mapped with different configurations on the same channel BW to
- E-PDCCHs channel allocation by using different E-CCE sizes on different E-PDCCH configuration. 5.
- Composite control information streams are multiplexed with different E-CCE
- the present invention can be applied to a method of providing control information for User Equipment (UEs) in data communication with an eNodeB over a Long Term Evolution (LTE) wireless communication system.
- UEs User Equipment
- LTE Long Term Evolution
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Priority Applications (7)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
KR1020147018144A KR101932312B1 (en) | 2012-03-14 | 2013-02-18 | A method of providing control information for user equipment |
CN201380001908.8A CN103621164A (en) | 2012-03-14 | 2013-02-18 | A method of providing control information for user equipment |
KR1020137034800A KR101500258B1 (en) | 2012-03-14 | 2013-02-18 | A method of providing control information for user equipment |
EP20130760716 EP2710847A4 (en) | 2012-03-14 | 2013-02-18 | A method of providing control information for user equipment |
JP2013557958A JP5574065B1 (en) | 2012-03-14 | 2013-02-18 | Providing control information to UE |
CA2857489A CA2857489A1 (en) | 2012-03-14 | 2013-02-18 | A method of providing control information for user equipment |
US14/129,079 US20140126513A1 (en) | 2012-03-14 | 2013-02-18 | Method of providing control information for user equipment |
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AU2012901017 | 2012-03-14 | ||
AU2012901017A AU2012901017A0 (en) | 2012-03-14 | Method and appartus for e-cce's related design and implementation for lte rel'11 and beyond |
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WO2013136951A1 true WO2013136951A1 (en) | 2013-09-19 |
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PCT/JP2012/069053 WO2013136547A1 (en) | 2012-03-14 | 2012-07-19 | A method of providing control information for user equipment in an lte communication system |
PCT/JP2013/054642 WO2013136951A1 (en) | 2012-03-14 | 2013-02-18 | A method of providing control information for user equipment |
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PCT/JP2012/069053 WO2013136547A1 (en) | 2012-03-14 | 2012-07-19 | A method of providing control information for user equipment in an lte communication system |
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EP (1) | EP2710847A4 (en) |
JP (2) | JP5574065B1 (en) |
KR (2) | KR101500258B1 (en) |
CN (1) | CN103621164A (en) |
CA (1) | CA2857489A1 (en) |
WO (2) | WO2013136547A1 (en) |
Cited By (1)
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JP2015520549A (en) * | 2012-04-23 | 2015-07-16 | 電信科学技術研究院 | Method and apparatus for E-PDCCH transmission and blind detection |
Families Citing this family (3)
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CN110249602B (en) * | 2017-02-03 | 2022-07-05 | 株式会社Ntt都科摩 | User terminal and wireless communication method |
US11539488B2 (en) | 2018-01-26 | 2022-12-27 | Qualcomm Incorporated | Control element resource mapping schemes in wireless systems |
WO2019204996A1 (en) | 2018-04-24 | 2019-10-31 | 北京小米移动软件有限公司 | Interleaving mapping method and interleaving mapping device |
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JP2011078019A (en) * | 2009-10-01 | 2011-04-14 | Sharp Corp | Mobile station device, base station device, radio communication system, communication method, and control program |
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US20140071935A1 (en) * | 2012-09-07 | 2014-03-13 | Samsung Electronics Co., Ltd. | Multiplexing resource element groups for control channel elements of control channels |
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2012
- 2012-07-19 WO PCT/JP2012/069053 patent/WO2013136547A1/en active Application Filing
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2013
- 2013-02-18 KR KR1020137034800A patent/KR101500258B1/en active IP Right Grant
- 2013-02-18 WO PCT/JP2013/054642 patent/WO2013136951A1/en active Application Filing
- 2013-02-18 EP EP20130760716 patent/EP2710847A4/en not_active Withdrawn
- 2013-02-18 CN CN201380001908.8A patent/CN103621164A/en active Pending
- 2013-02-18 KR KR1020147018144A patent/KR101932312B1/en active IP Right Grant
- 2013-02-18 CA CA2857489A patent/CA2857489A1/en not_active Abandoned
- 2013-02-18 JP JP2013557958A patent/JP5574065B1/en active Active
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Patent Citations (1)
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JP2011078019A (en) * | 2009-10-01 | 2011-04-14 | Sharp Corp | Mobile station device, base station device, radio communication system, communication method, and control program |
Non-Patent Citations (4)
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"DCI Multiplexing for E-PDCCH", 3GPP DOCUMENT NO. RL-120257 |
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Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2015520549A (en) * | 2012-04-23 | 2015-07-16 | 電信科学技術研究院 | Method and apparatus for E-PDCCH transmission and blind detection |
US9661622B2 (en) | 2012-04-23 | 2017-05-23 | China Academy Of Telecommunications Technology | Method and device for E-PDCCH transmission and blind detection |
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Publication number | Publication date |
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CA2857489A1 (en) | 2013-09-19 |
WO2013136547A1 (en) | 2013-09-19 |
KR20140123932A (en) | 2014-10-23 |
EP2710847A4 (en) | 2014-07-02 |
JP2014212537A (en) | 2014-11-13 |
KR101500258B1 (en) | 2015-03-06 |
JP2014520411A (en) | 2014-08-21 |
CN103621164A (en) | 2014-03-05 |
KR101932312B1 (en) | 2018-12-24 |
JP5574065B1 (en) | 2014-08-20 |
EP2710847A1 (en) | 2014-03-26 |
KR20140012198A (en) | 2014-01-29 |
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