US 11,985,725 B2
Signaling for inactive small data transmission without path switching
Jaemin Han, Cupertino, CA (US); Yi Guo, Cupertino, CA (US); Alexander Sirotkin, Cupertino, CA (US); and Sudeep Palat, Cupertino, CA (US)
Assigned to Apple Inc., Cupertino, CA (US)
Appl. No. 17/438,869
Filed by Apple Inc., Cupertino, CA (US)
PCT Filed Mar. 18, 2020, PCT No. PCT/US2020/023374
§ 371(c)(1), (2) Date Sep. 13, 2021,
PCT Pub. No. WO2020/191059, PCT Pub. Date Sep. 24, 2020.
Claims priority of provisional application 62/820,766, filed on Mar. 19, 2019.
Prior Publication US 2022/0061121 A1, Feb. 24, 2022
Int. Cl. H04W 76/27 (2018.01)
CPC H04W 76/27 (2018.02) 19 Claims
OG exemplary drawing
 
1. A method comprising:
receiving, by a first node, a resume request from a user equipment (UE) that is in an inactive state, the resume request comprising a small data indication, wherein context information for the UE resides at a second node;
transmitting, by the first node, a retrieve UE context request to the second node, the retrieve UE context request comprising the small data indication;
receiving, by the first node, a UE context response from the second node;
transferring a UE context to the first node from the second node;
receiving, by the first node, Radio Resource Control (RRC) release information from the second node;
transmitting, by the first node, a resume response to the UE to cause the UE to switch to a connected state from the inactive state;
processing, by the first node, uplink data from the UE; and
transmitting, by the first node, a release message to the UE to cause the UE to switch to the inactive state from the connected state, wherein the release message is based on the RRC release information received from the second node and the UE context is transferred back to the second node after completion of a data transfer.