US 12,250,735 B2
Inactive direct transmission from user equipment (UE) via random access channel (RACH) procedure
Fangli Xu, Beijing (CN); Chunhai Yao, Beijing (CN); Dawei Zhang, Saratoga, CA (US); Haijing Hu, Los Gatos, CA (US); Longda Xing, San Jose, CA (US); Murtaza A. Shikari, Mountain View, CA (US); Sarma V. Vangala, Campbell, NJ (US); Srinivasan Nimmala, San Jose, CA (US); and Wei Zeng, Saratoga, CA (US)
Assigned to Apple Inc., Cupertino, CA (US)
Appl. No. 17/441,507
Filed by Apple Inc., Cupertino, CA (US)
PCT Filed Aug. 6, 2020, PCT No. PCT/CN2020/107452
§ 371(c)(1), (2) Date Sep. 21, 2021,
PCT Pub. No. WO2022/027455, PCT Pub. Date Feb. 10, 2022.
Prior Publication US 2023/0156823 A1, May 18, 2023
Int. Cl. H04W 74/08 (2024.01); H04W 74/0833 (2024.01); H04W 76/27 (2018.01)
CPC H04W 74/085 (2013.01) [H04W 76/27 (2018.02)] 20 Claims
OG exemplary drawing
 
1. A baseband processor, comprising:
a memory interface and a communication interface; and
processing circuitry communicatively coupled to the memory interface and the communication interface and, when executing instructions received from the memory interface, performs operations comprising:
generating a Random Access Channel (RACH) preamble in response to a determination to perform a Radio Resource Control (RRC) inactive data transmission in a RRC inactive state;
providing uplink (UL) data to the communication interface for the RRC inactive data transmission, wherein the RRC inactive data transmission comprises a medium access control control element (MAC CE) with an inactive radio network temporary identifier (I-RNTI), or a truncated I-RNTI (I-RNTI/truncated I-RNTI), or the RRC inactive data transmission is scrambled based on the I-RNTI/truncated I-RNTI;
starting a contention resolution (CR) timer after the RRC inactive data transmission, wherein the CR timer is set to end at a CR duration limit; and
receiving, before the CR timer ends at the CR duration limit, a RACH message in response to the RRC inactive data transmission, wherein the RACH message comprises at least one of an uplink (UL) grant or a downlink (DL) assignment scrambled by the I-RNTI/truncated I-RNTI, or the RACH message comprises a DL assignment based on a temporary cell radio network temporary identifier (T-C-RNTI) that is comprised in the MAC CE.