US 12,284,680 B2
Methods and apparatus for PRACH resource determination and RA-RNTI computation in wireless communication
Hong He, San Jose, CA (US); Chunxuan Ye, San Diego, CA (US); Dawei Zhang, Saratoga, CA (US); Haitong Sun, Cupertino, CA (US); Huaning Niu, San Jose, CA (US); Jie Cui, San Jose, CA (US); Oghenekome Oteri, San Diego, CA (US); Wei Zeng, Saratoga, CA (US); and Yang Tang, San Jose, CA (US)
Assigned to Apple Inc., Cupertino, CA (US)
Filed by Apple Inc., Cupertino, CA (US)
Filed on Nov. 23, 2021, as Appl. No. 17/456,304.
Claims priority of provisional application 63/137,382, filed on Jan. 14, 2021.
Prior Publication US 2022/0225416 A1, Jul. 14, 2022
Int. Cl. H04W 74/0833 (2024.01); H04W 72/0446 (2023.01); H04L 27/26 (2006.01)
CPC H04W 74/0833 (2013.01) [H04W 72/0446 (2013.01); H04L 27/26025 (2021.01)] 5 Claims
OG exemplary drawing
 
1. A wireless device comprising:
a radio; and
a processor operably coupled to the radio,
wherein the processor is configured to:
determine a Physical Random Access Channel (PRACH) resource mapping,
wherein the determined PRACH resource mapping comprises a starting symbol position within a reference slot,
wherein the starting symbol position is determined based, at least in part, on a 480 kHz subcarrier spacing configuration of PRACH resources being used by a wireless network that the wireless device is operating on, and
wherein a number of PRACH Occasions is less than or equal to two and evenly distributed in time within the reference slot, with at least one PRACH Occasion in a last index position of the reference slot; and
use the radio to transmit a Random Access Channel (RACH) preamble and associated Random Access Radio Network Temporary Identifier (RA-RNTI) via the determined PRACH resource mapping during at least one of the number of PRACH Occasions.