US Patent No. 11,116,006

UPLINK TRANSMISSION PARAMETER SELECTION FOR RANDOM ACCESS INITIAL MESSAGE TRANSMISSION AND RETRANSMISSION


Patent No. 11,116,006
Issue Date September 07, 2021
Title Uplink Transmission Parameter Selection For Random Access Initial Message Transmission And Retransmission
Inventorship Muhammad Nazmul Islam, Edison, NJ (US)
Sumeeth Nagaraja, San Diego, CA (US)
Tao Luo, San Diego, CA (US)
Bilal Sadiq, Basking Ridge, NJ (US)
Junyi Li, Chester, NJ (US)
Sundar Subramanian, Bridgewater, NJ (US)
Assignee QUALCOMM Incorporated, San Diego, CA (US)

Claim of US Patent No. 11,116,006


1. A method for wireless communication, comprising:identifying a first uplink transmission beam for a random access procedure;
transmitting, to a base station, a random access message using the first uplink transmission beam;
selecting a second uplink transmission beam based at least in part on an absence of a random access response from the base station corresponding to the random access message transmitted using the first uplink transmission beam and a current path loss estimate, the second uplink transmission beam having a different transmission direction than the first uplink transmission beam;
determining a path loss difference between the current path loss estimate and a previous path loss estimate;
determining an uplink transmission power based at least in part on a power ramping counter value, the path loss difference satisfying a threshold path loss difference, and the selection of the second uplink transmission beam; and
retransmitting the random access message to the base station using the second uplink transmission beam and the determined uplink transmission power, wherein the power ramping counter value is based at least in part on a number of retransmissions of the random access message and a number of times an uplink transmission beam is selected based at least in part on the absence of the random access response.