US 12,477,573 B2
Techniques for channel access by a user device with uplink (UL) cancellation in unlicensed bands
Oghenekome Oteri, San Diego, CA (US); Weidong Yang, San Diego, CA (US); Sigen Ye, Whitehouse Station, NJ (US); Haitong Sun, Cupertino, CA (US); Chunhai Yao, Beijing (CN); Yushu Zhang, Beijing (CN); Dawei Zhang, Saratoga, CA (US); Chunxuan Ye, San Diego, CA (US); Wei Zeng, Saratoga, CA (US); and Hong He, San Jose, CA (US)
Assigned to Apple Inc., Cupertino, CA (US)
Appl. No. 17/593,754
Filed by Apple Inc., Cupertino, CA (US)
PCT Filed Aug. 5, 2020, PCT No. PCT/CN2020/107027
§ 371(c)(1), (2) Date Sep. 23, 2021,
PCT Pub. No. WO2022/027292, PCT Pub. Date Feb. 10, 2022.
Prior Publication US 2023/0156783 A1, May 18, 2023
Int. Cl. H04W 74/0808 (2024.01); H04W 74/04 (2009.01); H04W 74/08 (2024.01); H04W 74/0816 (2024.01)
CPC H04W 74/04 (2013.01) [H04W 74/0808 (2013.01); H04W 74/0816 (2013.01); H04W 74/0875 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A method performed by a second user device for communications in a wireless system, comprising:
transmitting, to a node, unlicensed frequency transmission capability information;
receiving, from the node, an uplink transmission time for the second user device based on the unlicensed frequency transmission capability;
receiving, from the node, a request to transmit a reservation transmission to occupy an unlicensed frequency band based on a cancellation time capability of a first user device and the uplink transmission time;
transmitting the reservation transmission to occupy the unlicensed frequency band, wherein the reservation transmission begins at the beginning of a cancellation time window of the first user device based on the cancellation time capability and ends at the beginning of a maximum contention time window; and
transmitting, to the node, an uplink transmission in the unlicensed frequency band at the uplink transmission time.