US 11,818,615 B2
User equipment, source access node, target access node, and methods in a wireless communications network for handling data packets in a handover
Claes-Göran Persson, Mjölby (SE); Paul Schliwa-Bertling, Ljungsbro (SE); Johan Rune, Lidingö (SE); Pontus Wallentin, Linköping (SE); and Pradeepa Ramachandra, Linköping (SE)
Assigned to Telefonaktiebolaget LM Ericsson (Publ), Stockholm (SE)
Appl. No. 17/286,546
Filed by Telefonaktiebolaget LM Ericsson (publ), Stockholm (SE)
PCT Filed Oct. 29, 2019, PCT No. PCT/SE2019/051078
§ 371(c)(1), (2) Date Apr. 19, 2021,
PCT Pub. No. WO2020/091674, PCT Pub. Date May 7, 2020.
Claims priority of provisional application 62/753,958, filed on Nov. 1, 2018.
Prior Publication US 2021/0345205 A1, Nov. 4, 2021
Int. Cl. H04W 36/02 (2009.01); H04W 36/00 (2009.01); H04W 74/08 (2009.01)
CPC H04W 36/023 (2013.01) [H04W 36/0011 (2013.01); H04W 74/0833 (2013.01)] 18 Claims
OG exemplary drawing
 
1. A method performed by a target access node for handling data packets in a handover of a User Equipment, UE, from a source cell served by a source access node, to a target cell served by the target access node, in a wireless communications network, the method comprising:
receiving a status report of last received data packet in the UE from the source access node;
performing a data packet duplication check based on the information comprised in the status report;
sending to the UE, only data packets which have not already been received by the UE from the source access node, based on the outcome of the duplication check;
receiving a handover request message from a source access node serving the source cell, which handover request message comprises an enhanced make-before-break, MBB, indicator; and
based on the enhanced MBB indicator, reserving uplink, UL, resources for a status report of last received data packet in the UE from the source access node.