US 11,792,706 B2
Uplink transmission for dual active protocol stack handover
Chunhai Yao, Beijing (CN); Chunxuan Ye, San Diego, CA (US); Dawei Zhang, Saratoga, CA (US); Fangli Xu, Beijing (CN); Haijing Hu, Beijing (CN); Haitong Sun, Irvine, CA (US); Hong He, Cupertino, CA (US); Jie Cui, San Jose, CA (US); Oghenekome Oteri, San Diego, CA (US); Weidong Yang, San Diego, CA (US); Wei Zeng, San Diego, CA (US); Yang Tang, Cupertino, CA (US); Yuchul Kim, Santa Clara, CA (US); Yuqin Chen, Shenzhen (CN); and Yushu Zhang, Beijing (CN)
Assigned to Apple Inc., Cupertino, CA (US)
Appl. No. 17/53,674
Filed by Apple Inc., Cupertino, CA (US)
PCT Filed Nov. 7, 2019, PCT No. PCT/CN2019/116253
§ 371(c)(1), (2) Date Nov. 6, 2020,
PCT Pub. No. WO2021/087864, PCT Pub. Date May 14, 2021.
Prior Publication US 2022/0264410 A1, Aug. 18, 2022
Int. Cl. H04W 4/00 (2018.01); H04W 36/18 (2009.01); H04W 36/00 (2009.01); H04L 27/26 (2006.01); H04W 56/00 (2009.01)
CPC H04W 36/18 (2013.01) [H04L 27/26025 (2021.01); H04W 36/0069 (2018.08); H04W 56/0045 (2013.01)] 17 Claims
OG exemplary drawing
 
1. A cellular base station configured to provide a first cell, comprising:
at least one antenna;
at least one radio coupled to the at least one antenna; and
a processor coupled to the at least one radio;
wherein the cellular base station is configured to:
receive an indication from a wireless device of a propagation delay between the wireless device and the first cell, a propagation delay between the wireless device and a second cell, and a propagation delay difference handling capability of the wireless device,
wherein the first cell is a source cell of a dual active protocol stack (DAPS) handover by the wireless device, wherein the second cell is a target cell of the DAPS handover; and
determine a time division multiplexing (TDM) pattern for uplink communication for the wireless device during the DAPS handover, wherein the TDM pattern is determined based at least in part on the propagation delay between the wireless device and the first cell, the propagation delay between the wireless device and the second cell, and the propagation delay difference handling capability of the wireless device, wherein to determine the TDM pattern for uplink communication for the wireless device during the DAPS handover, the cellular base station is further configured to:
determine a propagation delay difference for the wireless device, wherein the propagation delay difference comprises a difference between the propagation delay between the wireless device and the first cell and the propagation delay between the wireless device and the second cell; and
insert at least one guard period in the TDM pattern if the propagation delay difference is greater than the propagation delay difference handling capability of the wireless device,
wherein no guard period is inserted in the TDM pattern if the propagation delay difference is not greater than the propagation delay difference handling capability of the wireless device.