Method for channel access in wireless communication system and apparatus for performing same

    公开(公告)号:US10560964B2

    公开(公告)日:2020-02-11

    申请号:US15751975

    申请日:2016-08-19

    Abstract: A method for performing channel access in an unlicensed band by a base station in a wireless communication system according to an embodiment of the present invention may comprise the steps of: sensing, in an unlicensed band, a carrier for transmitting a downlink signal; and transmitting the downlink signal when power detected by sensing the carrier is less than an energy detection threshold set by the base station, wherein the energy detection threshold is set to be equal to or less than a maximum energy detection threshold determined by the base station, and when another radio access technology (RAT) sharing the carrier exists, the maximum energy detection threshold is adaptively determined depending on the bandwidth size of the carrier, using the value, in decibels, of the ration between a reference bandwidth and the bandwidth of the carrier.

    Method and apparatus for transmitting or receiving downlink signal in unlicensed band of wireless communication system

    公开(公告)号:US10455433B2

    公开(公告)日:2019-10-22

    申请号:US15184834

    申请日:2016-06-16

    Abstract: A method for channel sensing in an unlicensed band and transmitting downlink signals in a wireless communication system is disclosed. The method is performed by a transmission node configured to transmit the downlink signal after the channel sensing. The method includes sensing a channel scheduled to transmit downlink signals on a secondary cell (S-Cell) in the unlicensed band, and if the channel scheduled to transmit the downlink signals is determined to be in an unoccupied state according to the channel sensing, transmitting the downlink signals through a secondary cell (S-Cell) transmission structure having a boundary of a transmission unit shifted by a specific time index from a boundary of a transmission unit of a primary cell (P-Cell) transmission structure. The specific time index may be selected from among a plurality of candidate time indexes.

    Method and apparatus for transmitting channel state information in wireless communication system

    公开(公告)号:US10439692B2

    公开(公告)日:2019-10-08

    申请号:US14767825

    申请日:2014-06-05

    Abstract: The present invention relates to a wireless communication system. A method for transmitting CSI by a terminal in a wireless communication system according to an embodiment of the present invention comprises: subsampling a first codebook associated with a first PMI and a second codebook associated with a second PMI according to a report sub-mode for four antenna ports; and reporting channel state information based on the subsampled first codebook and the subsampled second codebook, wherein a first codebook index for the first PMI may be determined as one of 0, 4, 8, and 12 when RI is 1 or 2, a second codebook index for the second PMI may be determined as one of 0, 2, 8, and 10 when the RI is 1, and the second codebook index for the second PMI may be determined as one of 0, 1, 4, and 5 when the RI is 2.

    Method for transmitting uplink channel and demodulation reference signal by MTC device

    公开(公告)号:US10348477B2

    公开(公告)日:2019-07-09

    申请号:US15520410

    申请日:2015-10-22

    Abstract: A disclosure of the present specification provides a method for transmitting an uplink channel and a demodulation reference signal (DMRS) by a machine type communication (MTC) device. The method may comprise the steps of: determining a frequency resource area for transmitting an uplink channel so as to have a size equal to or smaller than the size of a physical resource block (PRB) including 12 subcarriers; generating a DMRS sequence for some sub-carriers among the 12 subcarriers when the frequency resource area for transmitting the uplink channel is determined to have a size smaller than the size of the PRB including the 12 subcarriers; and transmitting the uplink channel and the DMRS on the some subcarriers in the PRB.

    Method and apparatus for cancelling interference and receiving signal in wireless communication system

    公开(公告)号:US10148299B2

    公开(公告)日:2018-12-04

    申请号:US15646483

    申请日:2017-07-11

    Abstract: A method for cancelling interference and receiving a signal by a user equipment in a wireless communication system, the method includes identifying assistance information for cancelling an interference signal transmitted from an interfering base station; cancelling the interference signal based on the assistance information; and receiving a desired signal from a serving base station, wherein the user equipment assumes a part of the assistance information for cancelling the interference signal as a limited value and then receives the interference signal, and wherein a modulation order of the interference signal as the part of the assistance information is smaller than or equal to a specific value as the limited value.

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