On Multiple PRACH Preambles and Random Access Responses

    公开(公告)号:US20210105822A1

    公开(公告)日:2021-04-08

    申请号:US16606950

    申请日:2018-04-26

    Abstract: A method including, detecting, by a base station in a wireless communication system, within an RAR window, at least one of multiple first messages from a plurality of user equipments, wherein the plurality of user equipments is permitted to transmit multiple first messages within the RAR window, and wherein each first message includes a PRACH preamble; in response to receiving at least one PRACH preamble in the at least one of multiple first messages, transmitting at least one second message including an RAR downlink channel for each preamble received; receiving at least one third message, from at least one user equipment of the plurality of user equipments, including a beam connection request and transmitting at least one fourth message to the at least one user equipment on the requested beam.

    RACH-BASED TX BEAM REFINEMENT PROCEDURE

    公开(公告)号:US20220295570A1

    公开(公告)日:2022-09-15

    申请号:US17594845

    申请日:2019-05-03

    Abstract: In accordance with some example embodiments, an apparatus may comprise at least one processor and at least one memory including computer program code, wherein the at least one memory and the computer program code are configured to, with the at least one processor, cause the apparatus to transmit at least one parameter configuration of a random access channel procedure to a user equipment; receive at least one physical uplink shared channel part of a first random access channel message using at least one transmitter beam configuration; upon detection of at least one preamble part of the first random access channel message, decode the physical uplink shared channel part of the first random access channel message and perform at least one channel quality measurement on at least one demodulation reference signal sequence transmitted on a number of selected transmitter beam configurations.

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