Method for estimating channel by terminal in wireless communication system, and device therefor

    公开(公告)号:US11799691B2

    公开(公告)日:2023-10-24

    申请号:US17266424

    申请日:2019-08-09

    CPC classification number: H04L25/0202 H04B7/06 H04L27/2613 H04W72/23

    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 random access process and apparatus therefor

    公开(公告)号:US11166322B2

    公开(公告)日:2021-11-02

    申请号:US16637645

    申请日:2018-08-09

    Abstract: The present invention relates to a method for performing, by a terminal, a random access process in a wireless communication system supporting first and second preamble formats, and an apparatus therefor. Particularly, the present invention relates to a method comprising: a step of receiving narrowband physical random access channel (NPRACH) configuration information; and a step of transmitting a random access preamble on the basis of a preamble format indicated by the NPRACH configuration information of the first and second preamble formats, wherein the length of one symbol of the second preamble format corresponds to three times the length of one symbol of the first preamble format, and the first preamble format has a frequency grid spacing of 3.75 kHz, and the second preamble format has a frequency grid spacing of 1.25 kHz, and to an apparatus therefor.

    Method for transmitting and receiving random access preamble in wireless communication system and apparatus therefor

    公开(公告)号:US11096222B2

    公开(公告)日:2021-08-17

    申请号:US16578106

    申请日:2019-09-20

    Abstract: Disclosed are a method for transmitting a random access preamble in a wireless communication system supporting a narrowband-Internet of things (NB-IoT) and an apparatus therefor. Specifically, the method performed by the terminal may include: receiving, from a base station, first configuration information for a first random access preamble and second configuration information for a second random access preamble; transmitting, to the base station, the first random access preamble by using the first configuration information; and transmitting, to the base station, the second random access preamble based on the second configuration information, when transmission of the first random access preamble satisfies a predetermined criterion, in which any one of the first random access preamble and the second random access preamble may be generated based on a sequence in which all elements are not configured to 1.

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