METHOD FOR PERFORMING INITIAL ACCESS PROCEDURE IN UNLICENSED BAND IN WIRELESS COMMUNICATION SYSTEM AND USER EQUIPMENT USING SAME

    公开(公告)号:US20210345407A1

    公开(公告)日:2021-11-04

    申请号:US17267314

    申请日:2019-08-09

    Abstract: The present disclosure provides a method, performed by a user equipment (UE), for performing an initial access procedure in an unlicensed band, the method comprising: performing the initial access procedure with a base station; and performing transmission of a physical uplink shared channel (PUSCH) on the basis of the performing of the initial access procedure, wherein the UE obtains, from the base station, information about a listen before talk (LBT) type and information about a PUSCH starting position, and the UE performs the transmission of the PUSCH on the basis of the information about the LBT type and the information about the PUSCH starting position. The information about the PUSCH starting position is information indicating one position among a plurality of PUSCH starting position candidates. The information about the LBT type indicates one of a LBT type 1, a LBT type 2, and a LBT type 3. The UE performs random backoff-based LBT in the LBT type 1, the UE performs LBT without a random backoff in the LBT type 2, and the UE does not perform LBT in the LBT type 3.

    METHOD FOR ESTIMATING CHANNEL BY TERMINAL IN WIRELESS COMMUNICATION SYSTEM, AND DEVICE THEREFOR

    公开(公告)号:US20210336819A1

    公开(公告)日:2021-10-28

    申请号:US17266424

    申请日:2019-08-09

    Abstract: Disclosed are a method for channel estimation in a wireless communication system, and a device therefor. Particularly, the method for estimating a channel by a terminal in a wireless communication comprises the steps for: receiving, from a base station, configuration information for channel estimation, the configuration information comprising relationship information related to the relationship between a cell-specific reference signal (CRS) and a demodulation-reference signal (DM-RS); receiving the CRS from the base station; receiving, from the base station, on a specific channel, the DM-RS and machine type communication (MTC) control information; estimating the specific channel by using the CRS and DM-RS, on the basis of the relationship information; and decoding the MTC control information via the estimated specific channel, wherein the relationship information comprises information about a pre-coding relationship between the CRS and DM-RS, and power ratio information of the CRS with respect to the DM-RS, and the power ratio information is information related to the power ratio between a CRS port and DM-RS port for an idle mode.

    METHOD FOR PERFORMING CHANNEL ESTIMATION IN WIRELESS COMMUNICATION SYSTEM AND DEVICE THEREFOR

    公开(公告)号:US20210306182A1

    公开(公告)日:2021-09-30

    申请号:US17266949

    申请日:2019-08-08

    Abstract: The present specification provides a method for estimating a channel by a terminal in a wireless communication system supporting machine-type communication (MTC). Particularly, the terminal receives, from a base station, configuration information for receiving a cell-specific reference signal (CRS) and a dedicated demodulation reference signal (DMRS), and receives the CRS on the basis of the configuration information. The terminal then receives the DMRS and control information by means of an MTC physical downlink control channel (MPDCCH), performs channel estimation for the MPDCCH on the basis of the DMRS and the CRS, and demodulates the control information on the basis of the channel estimation, wherein one precoder among a plurality of candidate precoders applied to the CRS is applied to the DMRS.

    METHOD FOR TRANSMITTING RACH BY TERMINAL IN WIRELESS COMMUNICATION SYSTEM AND TERMINAL USING SAME METHOD

    公开(公告)号:US20210298090A1

    公开(公告)日:2021-09-23

    申请号:US17267378

    申请日:2019-08-09

    Abstract: A method for transmitting a random access channel (RACH) by a terminal in a wireless communication system is provided. The method comprises: receiving a synchronization signal block (SSB) from a base station; receiving a downlink signal from the base station; and when the reception of the downlink signal is finished, transmitting the RACH to the base station, wherein the SSB is periodically transmitted in every Nth fixed frame period (FFP), N is an integer equal to or greater than 1, and the starting time point for transmission of the SSB corresponds to a first time resource included in the every Nth FFP.

    METHOD FOR SIGNALING CONTROL INFORMATION, AND APPARATUS THEREFOR

    公开(公告)号:US20210289492A1

    公开(公告)日:2021-09-16

    申请号:US17335886

    申请日:2021-06-01

    Abstract: The present invention relates to a wireless communication system. In detail, the invention relates to a method for a terminal to transmit a UCI in a carrier aggregation-based wireless communication system, and to an apparatus therefor, wherein the method involves the steps of: forming a first cell group having a PCell; forming a second cell group having one or more SCells; receiving one or more data in the second cell group; and transmitting HARQ-ACK information on the one or more data through a PUCCH, wherein, when the first and second cell groups are managed by an identical base station, the HARQ-ACK information is transmitted in the PCell, and, when the first and second cell groups are managed by different base stations, the HARQ-ACK information is transmitted in the second cell group.

Patent Agency Ranking