US 12,336,018 B2
Random access channel configuration in an integrated access and backhaul network
Lili Wei, Portland, OR (US); Qian Li, Beaverton, OR (US); and Geng Wu, Portland, OR (US)
Assigned to Apple Inc., Cupertino, CA (US)
Appl. No. 17/441,631
Filed by Apple Inc., Cupertino, CA (US)
PCT Filed May 1, 2020, PCT No. PCT/US2020/031183
§ 371(c)(1), (2) Date Sep. 21, 2021,
PCT Pub. No. WO2020/223703, PCT Pub. Date Nov. 5, 2020.
Claims priority of provisional application 62/842,417, filed on May 2, 2019.
Prior Publication US 2022/0150983 A1, May 12, 2022
Int. Cl. H04W 74/08 (2024.01); H04W 72/0446 (2023.01); H04W 74/0833 (2024.01); H04W 76/20 (2018.01); H04W 88/14 (2009.01)
CPC H04W 74/0841 (2013.01) [H04W 72/0446 (2013.01); H04W 74/0866 (2013.01); H04W 76/20 (2018.02); H04W 88/14 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A method comprising:
receiving, by a first integrated access and backhaul (IAB) node, a Radio Resource Control (RRC) message from a second IAB node, the RRC message comprising an information element (IE) having fields specifying a slot offset and a subframe offset of a backhaul random access channel (RACH) periodicity to an existing RACH configuration, wherein the slot offset comprises a prach-SlotOffset field specifying a slot-based offset of the backhaul RACH periodicity to the existing RACH configuration, and the subframe offset comprises a prach-SubframeOffset field specifying a subframe-based offset of the backhaul RACH periodicity to the existing RACH configuration;
determining, while maintaining the existing RACH configuration, a new RACH configuration that includes the slot offset and the subframe offset from the RRC message; and
in response to determining the new RACH configuration:
determining to stop using the existing RACH configuration; and
initiating a random access procedure with the IAB node using the new RACH configuration with the slot offset and the subframe offset, the initiating comprising determining a new slot number or a new subframe number based at least on the slot offset or the subframe offset, an existing slot number or an existing subframe number for the existing RACH configuration, and a number of slots or subframes in a frame.