US 12,267,798 B2
Uplink transmit switching with multiple timing advance groups
Ankit Bhamri, Bad Nauheim (DE); Dawei Zhang, Saratoga, CA (US); Sigen Ye, 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 Jul. 20, 2022, as Appl. No. 17/813,783.
Prior Publication US 2024/0031967 A1, Jan. 25, 2024
Int. Cl. H04W 56/00 (2009.01); H04L 5/00 (2006.01)
CPC H04W 56/005 (2013.01) [H04L 5/0092 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A method for managing uplink (UL) transmit switching between multiple carriers with multiple timing advance groups (TAGs), the method comprising:
by a wireless device:
determining an UL switching gap time period between using a first set of UL carriers and using a second set of UL carriers for UL communication with a cellular wireless network;
when at least two UL carriers in the second set of UL carriers belong to different timing advance groups (TAGs), determining whether initial UL transmission opportunities of one or more UL carriers in the second set of UL carriers, after applying corresponding timing advance values, overlap the UL switching gap time period; and
when an initial UL transmission opportunity of at least one UL carrier in the second set of UL carriers overlaps the UL switching gap time period, refraining from transmitting during the initial UL transmission opportunity of the at least one UL carrier in the second set of UL carriers.