US 11,659,592 B2
Contention window adjustment mechanisms for FELAA systems
Salvatore Talarico, Sunnyvale, CA (US); Jeongho Jeon, San Jose, CA (US); Wenting Chang, Beijing (CN); and Huaning Niu, San Jose, CA (US)
Assigned to Apple Inc., Cupertino, CA (US)
Filed by APPLE INC., Cupertino, CA (US)
Filed on Jan. 17, 2019, as Appl. No. 16/250,360.
Claims priority of provisional application 62/619,381, filed on Jan. 19, 2018.
Claims priority of provisional application 62/619,249, filed on Jan. 19, 2018.
Prior Publication US 2019/0159256 A1, May 23, 2019
Int. Cl. H04W 74/08 (2009.01); H04W 16/14 (2009.01); H04L 1/1867 (2023.01); H04L 1/1812 (2023.01); H04W 84/04 (2009.01)
CPC H04W 74/0808 (2013.01) [H04L 1/187 (2013.01); H04L 1/1887 (2013.01); H04W 16/14 (2013.01); H04L 1/1812 (2013.01); H04W 84/042 (2013.01)] 14 Claims
OG exemplary drawing
1. An apparatus of a user equipment (UE) to operate in a License Assisted Access (LAA) network, comprising:
radio frequency (RF) circuitry configured to communicate with the LAA network; and
one or more baseband processors communicatively coupled to the RF circuitry and configured to perform operations, comprising:
performing a Category 4 (Cat-4) Listen Before Talk (LBT) uplink (UL) transmission in the LAA network;
transmitting autonomous UL (AUL) uplink control information (UCI) to the LAA network, the AUL UCI comprising a joint indication indicating both a remaining number of subframes to be used by the CAT-4 LBT UL transmission and a length of a remaining maximum channel occupancy time (MCOT);
when neither an UL grant nor an AUL downlink feedback indicator (DFI) is received after N subframes have elapsed since a first subframe of the Cat-4 LBT uplink transmission, increasing a value of a contention window size (CWS) of all priority classes at the UE to a next higher value; and
when the UL grant is received and a new data indicator (NDI) bit for an active hybrid automatic repeat request (HARQ) processes of a hybrid automatic repeat request identity (HARQ_ID) reference (HARQ_ID_ref) is not toggled, updating the CWS and redrawing a counter value.