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    SIGNALING METHODS FOR UE-SPECIFIC DYNAMIC DOWNLINK SCHEDULER IN OFDMA SYSTEMS
    1.
    发明授权
    SIGNALING METHODS FOR UE-SPECIFIC DYNAMIC DOWNLINK SCHEDULER IN OFDMA SYSTEMS 有权

    公开(公告)号：EP2599356B1

    公开(公告)日：2018-08-08

    申请号：EP12779587.0

    申请日：2012-05-04

    申请人： MediaTek Inc.

    发明人： LIAO, Pei-Kai ,  LIN, Chih-Yuan ,  CHEN, Yih-Shen

    IPC分类号： H04W72/04 ,  H04L5/00 ,  H04W28/06

    CPC分类号： H04W72/042 ,  H04L5/0051 ,  H04L5/0094 ,  H04W28/06

    摘要： Signaling methods for UE-specific downlink control channels in OFDMA systems are provided. In a first method, a dynamic downlink signaling in cell-specific radio resources is used to signal UE-specific downlink control channel in UE-specific radio resources. In LTE, a specific DCI format in PDCCH is used to dynamically signal the UE-specific downlink control channel X-PDCCH that resides in legacy PDSCH region. In a second method, a semi-static higher-layer signaling is used to signal UE-specific downlink control channel in UE-specific radio resources. In LTE, RRC signaling is used to semi-statically signal the UE-specific downlink control channel X-PDCCH that resides in legacy PDSCH region. By using UE-specific downlink control channels, significant control overhead reduction can be achieved.

    METHOD AND APPARATUS FOR BROADCASTING AND RECEIVING SYSTEM INFORMATION IN OFDMA SYSTEMS
    3.
    发明公开
    METHOD AND APPARATUS FOR BROADCASTING AND RECEIVING SYSTEM INFORMATION IN OFDMA SYSTEMS 有权
    方法和设备在OFDMA系统中广播和接收系统信息

    公开(公告)号：EP2404421A1

    公开(公告)日：2012-01-11

    申请号：EP10748326.5

    申请日：2010-03-02

    申请人： MediaTek Inc.

    发明人： CHEN, Yih-Shen ,  LIAO, Pei-Kai ,  LIN, Chih-Yuan

    IPC分类号： H04L27/26 ,  H04W88/00

    CPC分类号： H04W72/082 ,  H04L5/0007 ,  H04L5/0035 ,  H04L5/005 ,  H04L5/0073 ,  H04L25/0232 ,  H04W48/12

    摘要： A method for broadcasting system information via a broadcast channel (BCH) in an OFDMA system is provided. The BCH comprises one or more two-dimensional resource blocks. A plurality of pilot tones and a plurality of data tones are positioned within each resource block. The system information is mapped onto the plurality of data tones. In one embodiment, the plurality of pilot tones are located in configurable positions such that pilot tones of the same resource blocks transmitted by different base stations in the OFDMA system are interlaced to reduce pilot-to-pilot collision. In another embodiment, data tones that are located in pilot positions of other adjacent cells are nullified to reduce data-to-pilot collision. In one novel aspect, the property of interlaced pilot patterns and tone nullification is leveraged to estimate interference second-order statistics, which facilitates receiver implementation and improves receiver performance.

    PHYSICAL STRUCTURE AND SEQUENCE DESIGN OF MIDAMBLE IN OFDMA SYSTEMS
    7.
    发明公开
    PHYSICAL STRUCTURE AND SEQUENCE DESIGN OF MIDAMBLE IN OFDMA SYSTEMS 审中-公开
    物理结构和序列设计，用于在OFDMA系统中同步码

    公开(公告)号：EP2384588A1

    公开(公告)日：2011-11-09

    申请号：EP09836083.7

    申请日：2009-12-31

    申请人： Mediatek Inc.

    发明人： LIN, Chih-Yuan ,  LIAO, Pei-Kai

    IPC分类号： H04W4/18

    CPC分类号： H04J11/005 ,  H04L5/0007 ,  H04L5/005 ,  H04L27/261 ,  H04L2025/03796

    摘要： In wireless OFDMA systems, midamble is used to facilitate downlink (DL) channel estimation. Midamble signals are transmitted by a base station via a midamble channel allocated in a DL subframe. In a novel symbol-based midamble channel allocation scheme, a midamble channel is allocated in the first or the last OFDM symbol of multiple resource blocks of the subframe, while the remaining consecutive OFDM symbols are used for data transmission. The symbol-based midamble channel provides good coexistence between midamble signals and pilot signals without inducing additional limitation or complexity. Under a novel midamble channel and sequence arrangement, both code sequence and either time-domain or frequency-domain location degrees-of-freedom are considered such that the required number of midamble sequences is substantially smaller than the number of strong interferences. In addition, different midamble sequences are systematically generated based on a base sequence such that the receiving mobile station does not need to memorize all the different code sequences.

    SOUNDING MECHANISM UNDER CARRIER AGGREGATION
    9.
    发明公开
    SOUNDING MECHANISM UNDER CARRIER AGGREGATION 审中-公开
    健全的机制支持聚合

    公开(公告)号：EP2583518A1

    公开(公告)日：2013-04-24

    申请号：EP11795203.6

    申请日：2011-06-20

    申请人： Mediatek Inc.

    发明人： LIN, Chih-Yuan ,  CHANG, Yu-Hao

    IPC分类号： H04W72/04

    CPC分类号： H04L5/0048 ,  H04L5/001 ,  H04L5/0091 ,  H04W72/042

    摘要： Sounding mechanism for LTE-A systems under carrier aggregation is provided. A UE receives an uplink or downlink grant transmitted from an eNB over a primary carrier in a multi-carrier LTE-A system. The UE determines indicated carrier(s) and detects a triggering condition for aperiodic sounding transmission in the grant. The UE then selects UE-specific sounding reference signal (SRS) parameters. Finally, the UE transmits an aperiodic SRS (ap-SRS) over the indicated carrier(s) using the selected UE-specific SRS parameters. In one embodiment, the uplink or downlink grant is transmitted via a PDCCH carrying various DCI formats. Each DCI format contains a carrier indicator field (CIF) that indicates which carrier is used for ap-SRS transmission if cross-carrier scheduling is enabled. In another embodiment, DCI format 3/3A is transmitted via a PDCCH carrying a plurality of information fields, each field indicates if the UE should enable ap-SRS in a particular carrier.

    SOUNDING MECHANISM AND CONFIGURATION UNDER CARRIER AGGREGATION
    10.
    发明公开
    SOUNDING MECHANISM AND CONFIGURATION UNDER CARRIER AGGREGATION 有权
    健全的机制和配置载波聚合

    公开(公告)号：EP2520118A1

    公开(公告)日：2012-11-07

    申请号：EP11837590.6

    申请日：2011-11-03

    申请人： MediaTek Inc.

    发明人： CHEN, Yih-Shen ,  LIN, Chih-Yuan

    IPC分类号： H04W40/00

    CPC分类号： H04L5/0051 ,  H04L5/001 ,  H04L5/0023 ,  H04L5/0053 ,  H04L5/0091 ,  H04L5/0094 ,  H04W72/14

    摘要： A method of multi-set RRC signaling for ap-SRS configuration is provided to enhance ap-SRS flexibility. An eNB transmits a plurality of sets of UE-specific SRS parameters to a UE via upper layer messaging in a multi-carrier wireless communication system. The eNB also determines triggering information of a selected set of UE-specific SRS parameters and an indicated carrier for the UE. The eNB then transmits an uplink or downlink grant over a primary carrier, the grant comprises triggering information for the UE to send an ap-SRS over the indicated carrier using the selected set of UE-specific SRS parameters. In one embodiment of joint signaling, the plurality of sets of UE-specific SRS parameters are signaled together in a single RRC transmission. In another embodiment of separate signaling, each set of UE-specific SRS parameters is signaled independently.