Systems and methods for latency reduction for 2-step random access channel (RACH) hybrid automatic repeat requests (HARQ)

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United States of America

PATENT NO 12262420
APP PUB NO 20220377801A1
SERIAL NO

17754465

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Abstract

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Wireless communications systems and methods related to the timing arrangements and the transmission gap configurations in 2-step random access channel (RACH) procedures to improve system latency and reliability of a RACH HARQ process are provided. The UE transmits a first message including a random access preamble and a payload, and then monitors for a second message in response to the first message during a random access response (RAR) window. In response to determining that no second message is received by the UE from the BS or a back off indicator is received within the RAR window, the UE re-transmits the preamble and payload of the first message after the RAR window lapses. In response to determining if the second message received within the RAR window carries a FallbackRAR or SuccessRAR, the UE then determines to re-transmit the payload of the first message based on the FallbackRAR, or to transmit an acknowledgement message based on the SuccessRAR.

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Patent Owner(s)

Patent OwnerAddress
QUALCOMM INCORPORATED5775 MOREHOUSE DRIVE SAN DIEGO CA 92121-1714

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Aminzadeh, Gohari Amir Santa Clara, US 104 787
Chen, Wanshi San Diego, US 2748 35847
He, Linhai San Diego, US 560 1509
Huang, Yi San Diego, US 995 3138
Islam, Muhammad Nazmul Littleton, US 508 5298
Lei, Jing San Diego, US 492 2194
Lu, Enoch Shiao-Kuang San Diego, US 31 61
Yu, Yuanning Santa Clara, US 22 144
Zheng, Ruiming Beijing, CN 157 245

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