Method and user equipment for transmitting HARQ ACK/NACK for downlink data when using more than five cells according to carrier aggregation

    公开(公告)号:US10313062B2

    公开(公告)日:2019-06-04

    申请号:US15534455

    申请日:2015-12-04

    Abstract: Provided in one disclosure of the present specification is a method for transmitting a hybrid automatic repeat request (HARQ) acknowledgement (ACK)/negative-acknowledgement (NACK) for downlink data, when more than five cells are used according to carrier aggregation (CA) by a user equipment (UE). The method comprises the steps of: receiving, from a base station, a list of sets of which HARQ-ACK/NACK transmission is limited, through an upper layer signal; receiving, from the base station, information indicating a set of which HARQ-ACK/NACK transmission is limited at the present turn, from among the list of sets; receiving, from the base station, a plurality of items of downlink data through a plurality of cells; determining the set of which transmission is limited based on the information, from among the list of sets that has been received through the upper layer signal; and generating and transmitting uplink control information (UCI) including HARQ-ACK/NACK for the downlink data but excluding the HARQ-ACK/NACK according to the set which has been determined.

    Method for reporting channel state and device therefor

    公开(公告)号:US10178574B2

    公开(公告)日:2019-01-08

    申请号:US15304379

    申请日:2015-04-30

    Abstract: A method for reporting a channel state in a wireless communication system is performed by a terminal and comprises the steps of: receiving a configuration with respect to a zero-power transfer resource for a channel state measurement, wherein the zero-power transmission resource corresponds to a portion of a cell-specific reference signal (CRS) resource element (RE) of a serving base station or a CRS RE of a main interference base station; determining whether the zero-power transfer resource is set in a subframe to which a reference resource for the channel state measurement belongs; if the zero-power transfer resource is set in the subframe to which the reference resource belongs, calculating a value of a first-type or second-type channel state in the zero-power transfer resource; and reporting the calculated value of the first-type or second-type channel state to the serving base station, wherein the value of the first-type or second-type channel state can be a value from which the influence of an interference signal from the main interference base station has been removed.

    Method and device for performing channel estimation

    公开(公告)号:US10171212B2

    公开(公告)日:2019-01-01

    申请号:US15303894

    申请日:2015-07-03

    Abstract: A method for reporting a channel state on a downlink channel transmitted through M antenna ports that are 2-dimensionally arranged according to an embodiment of the present invention may be performed by a terminal and include a step of receiving a channel state information-reference signal (CSI-RS) setting for N virtual antenna ports that are formed by applying beam-forming to a group of vertical antennas of the 2-dimensionally arranged M antenna ports, and a step of calculating channel state information on the downlink channel by using the received CSI-RS setting to report the channel state information to a serving cell, wherein the reported channel state information may include information on a rotational transformation related to a first code word of a codebook related to a combination of Q unit vectors that are orthogonal in an N dimension space.

    Method for receiving or transmitting downlink control signal in wireless communication system and device for same

    公开(公告)号:US10051615B2

    公开(公告)日:2018-08-14

    申请号:US14430087

    申请日:2013-09-23

    Abstract: A method by which a user equipment receives a downlink control signal in a wireless communication system supporting carrier aggregation (CA) and coordinated multiple-point transmission and reception (CoMP), according to one embodiment of the present invention, comprises the steps of: receiving candidate sets of control information for the CA and the CoMP from a downlink serving base stations; and receiving an indicator for indicating one of the candidate sets from the downlink serving base station, wherein the candidate sets of the control information comprise a usable set of control information with respect to each carrier wave, and the control information can include information on carrier waves scheduled by the downlink serving base station, information on channel state information-reference signal antenna port(s) that is (are) quasi co-located (QCL) assumable with demodulation-reference signal antenna port(s) of the downlink serving base station, information on PDCH resource element (RE) mapping and/or information indicating whether or not QCL assumption between the channel state information-reference signal antenna port(s) and antenna port(s) indicated by the information on PDSCH RE mapping is possible.

    METHOD AND APPARATUS FOR TRANSMITTING CHANNEL STATE INFORMATION IN WIRELESS COMMUNICATION SYSTEM

    公开(公告)号:US20180115353A1

    公开(公告)日:2018-04-26

    申请号:US15819071

    申请日:2017-11-21

    Abstract: A method for reporting channel state information (CSI) by a user equipment (UE) in a wireless communication system, the method includes jointly encoding a rank indicator (RI) and a first precoding matrix indicator (PMI) into an encoded value for a specific CSI report mode; and reporting the encoded value, wherein the RI and the first PMI are jointly encoded into the encoded value in a way that following conditions are satisfied: when the RI is 1 and a codebook index for the first PMI is same as the encoded value, the encoded value is an integer ranging from 0 to 7, when the RI is 2 and the codebook index for the first PMI is the encoded value minus 8, the encoded value is integer ranging from 8 to 15, when the RI is 3 and a first precoding matrix corresponding to the first PMI is an identity matrix.

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