Configurations for transmitting random access preamble messages

    公开(公告)号:US12256434B2

    公开(公告)日:2025-03-18

    申请号:US16634563

    申请日:2018-07-10

    Abstract: Methods, systems, and devices for wireless communication are described. In some wireless systems, a user equipment (UE) may access a network or cell using a random access (RACH) procedure. A base station may allocate dedicated RACH resources and common RACH resources for the UE to transmit a RACH preamble message on and may convey a configuration for the UE. In some cases, the UE may perform multiple transmissions of the RACH preamble message in the dedicated RACH resources, and based on the configuration may determine whether to perform a single or multiple transmissions of the RACH preamble message in the common RACH resources. The UE may transmit the messages using the same or different uplink transmit beams, and the base station may receive the messages using the same or different uplink reception beams. These multiple transmissions may reduce latency and improve reliability of the RACH procedure.

    RANDOM ACCESS PROCEDURE FALLBACK
    238.
    发明公开

    公开(公告)号:US20240090036A1

    公开(公告)日:2024-03-14

    申请号:US18243234

    申请日:2023-09-07

    CPC classification number: H04W74/0833 H04W76/10

    Abstract: This disclosure provides systems, methods and apparatus for wireless communications that support fallback from a 2-step to a 4-step random access procedures. A user equipment (UE) may establish a connection with a base station using a random access procedure. The random access procedure may be a 2-step random access procedure and reduce a number of handover exchange messages. The 2-step random access procedure may include the UE transmitting, to the base station, a first random access message including a preamble and a payload. In some implementations, the base station may receive the preamble but fail to receive or decode the payload. The random access procedure may utilize the received preamble information instead of performing retransmission of the first random access message. The base station may transmit a second random access message to the UE indicating, explicitly or implicitly, a fallback to a 4-step random access procedure for connection establishment.

    MARKING SYMBOLS AND VALIDATION OF NON-CELL-DEFMARKING SYNCHRONIZATION SIGNAL BLOCK AND RANDOM ACCESS CHANNEL OCCASIONS

    公开(公告)号:US20240056281A1

    公开(公告)日:2024-02-15

    申请号:US18447794

    申请日:2023-08-10

    CPC classification number: H04L5/1469 H04W56/0015 H04W74/0833

    Abstract: This disclosure provides systems, methods, and devices for wireless communication that support marking symbols and validation of non-cell-defining-synchronization signal block (NCD-SSB) and random access channel (RACH) occasions within 5G new radio (NR) networks. In a first aspect, a method of wireless communication includes the UE obtaining an uplink-downlink configuration for one or more slots, an NCD-SSB configuration identifying NCD-SSB transmissions, and a bandwidth configuration identifying a bandwidth part (BWP) allocated to the UE and a configuration for cell-defining-synchronization signal block (CD-SSB) transmissions. The UE can mark a configured flexible symbol as a downlink symbol in response to either an NCD-SSB symbol or a CD-SSB symbol overlapping with the flexible symbol. Other aspects and features are also claimed and described.

    MEASUREMENT TYPE TRANSITION CONFIGURATIONS
    240.
    发明公开

    公开(公告)号:US20240040446A1

    公开(公告)日:2024-02-01

    申请号:US17877418

    申请日:2022-07-29

    CPC classification number: H04W36/0061

    Abstract: Methods, systems, and devices for wireless communications are described. The network may configure a user equipment (UE) with measurement objects indicating the synchronization signal blocks (SSB)s to be measured for neighbor cells. A UE may receive control signaling from the network indicating a switch from a first bandwidth part (BWP) to a second BWP. The first BWP may be associated with a first cell measurement type for neighbor cells (e.g., inter-frequency or intra-frequency) and a first reference SSB. The second BWP may be associated with a second, different, cell measurement type for neighbor cells and a second, different, reference SSB. After the BWP switch, the UE may perform measurements on SSBs associated with neighbor cells based on the second cell measurement type.

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