US 12,004,250 B2
Packet data convergence protocol data recovery
Matteo Fiorani, Solna (SE); and Panagiotis Saltsidis, Stockholm (SE)
Assigned to Telefonaktiebolaget LM Ericsson (publ), Stockholm (SE)
Filed by Telefonaktiebolaget LM Ericsson (publ), Stockholm (SE)
Filed on Feb. 9, 2023, as Appl. No. 18/107,768.
Application 18/107,768 is a continuation of application No. 17/257,148, granted, now 11,606,833, previously published as PCT/SE2019/050632, filed on Jun. 27, 2019.
Claims priority of provisional application 62/693,003, filed on Jul. 2, 2018.
Prior Publication US 2023/0189376 A1, Jun. 15, 2023
This patent is subject to a terminal disclaimer.
Int. Cl. H04W 76/19 (2018.01); H04L 1/08 (2006.01)
CPC H04W 76/19 (2018.02) [H04L 1/08 (2013.01)] 13 Claims
OG exemplary drawing
 
1. A method performed by a central unit (CU) of a base station comprising the CU and one or more distributed units (DU), for synchronizing radio link control re-establishment between a user equipment (UE) and a DU, the method comprising:
obtaining, in a control plane (CP) data processing apparatus of the CU, an indication that an uplink and/or downlink outage has occurred between the DU and the UE;
sending a request from the CP data processing apparatus to a user plane (UP) data processing apparatus of the CU, to instruct the UP data processing apparatus to retransmit, via the DU, any data protocol units previously transmitted to the UE which were unacknowledged by the UE; and,
responsive to the request, retransmitting, by the UP data processing apparatus and via the DU, any data protocol units previously transmitted to the UE which were unacknowledged by the UE.