US 12,250,600 B2
Enhancing inter-node handover signaling for conditional handover
Jaemin Han, Portland, OR (US); Alexander Sirotkin, Petah Tikva (IL); Bharat Shrestha, Hillsboro, OR (US); and Yi Guo, Shanghai (CN)
Assigned to Apple Inc., Cupertino, CA (US)
Appl. No. 17/440,525
Filed by Apple Inc., Cupertino, CA (US)
PCT Filed May 1, 2020, PCT No. PCT/US2020/031077
§ 371(c)(1), (2) Date Sep. 17, 2021,
PCT Pub. No. WO2020/223653, PCT Pub. Date Nov. 5, 2020.
Claims priority of provisional application 62/842,153, filed on May 2, 2019.
Prior Publication US 2022/0159529 A1, May 19, 2022
Int. Cl. H04W 36/00 (2009.01)
CPC H04W 36/0077 (2013.01) [H04W 36/0083 (2013.01); H04W 36/00835 (2018.08)] 20 Claims
OG exemplary drawing
 
1. A method comprising:
providing, from a source node associated with a first radio access technology (RAT) to a target node associated with a second RAT different from the first RAT, a first message comprising (i) a plurality of potential target cell identifiers corresponding to a plurality of potential target cells affiliated with the target node and (ii) one or more RAT-specific parameters for an inter-RAT conditional handover (CHO) from the first RAT to the second RAT;
after providing the first message, performing the inter-RAT CHO from the source node to the target node based on the first message; and
during the inter-RAT CHO, transmitting a second message from the source node to the target node, the second message comprising identifiers of two or more target cells that are no longer potential target cells for the inter-RAT CHO, wherein the two or more target cells indicated by the second message are a subset of the plurality of potential target cells affiliated with the target node.