US 12,107,786 B2
Method for tracking reference signal (TRS) enhancement
Yushu Zhang, Beijing (CN); Dawei Zhang, Saratoga, CA (US); Haitong Sun, Cupertino, CA (US); Wei Zeng, Saratoga, CA (US); and Weidong Yang, San Diego, CA (US)
Assigned to Apple Inc., Cupertino, CA (US)
Appl. No. 17/440,103
Filed by Apple Inc., Cupertino, CA (US)
PCT Filed Feb. 12, 2020, PCT No. PCT/CN2020/074933
§ 371(c)(1), (2) Date Sep. 16, 2021,
PCT Pub. No. WO2021/159337, PCT Pub. Date Aug. 19, 2021.
Prior Publication US 2022/0376855 A1, Nov. 24, 2022
Int. Cl. H04L 5/00 (2006.01); H04L 1/1867 (2023.01)
CPC H04L 5/0048 (2013.01) [H04L 1/1896 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A first electronic device, comprising:
a transceiver configured to transmit and receive wireless communications; and
a processor, coupled to the transceiver, configured to:
receive using the transceiver, an uplink reference signal from a user equipment (UE);
determine based at least on the uplink reference signal, that a Doppler offset has satisfied a threshold;
based on the determination, use a downlink assignment to enable an aperiodic Tracking Reference Signal (TRS) with high measurement density, wherein the aperiodic TRS shares a same quasi-co-located (QCL) parameter with a Physical Downlink Shared Channel (PDSCH) signal triggered by the downlink assignment; and
transmit, using the transceiver, the aperiodic TRS over a single frequency network (SFN) to the UE using the downlink assignment, wherein the aperiodic TRS enables the UE to decode the PDSCH signal that comprises a combined signal from the first electronic device and a second electronic device in the SFN.