Patent ID: 11963057
Assignee: TELEFONAKTIEBOLAGET LM ERICSSON (PUBL)
Field: Digital communication (Electrical engineering)
Classification: CPC H | IPC H

Claim 5:
6. A method performed by a source radio network node, the method comprising:
establishing, with a wireless device, an unacknowledged mode bearer with a source link;
transmitting, to the wireless device, a handover command that commands the wireless device to perform a make-before-break handover from the source link provided by the source radio network node to a target link provided by a target radio network node, the make-before-break handover comprises resetting a downlink data packet sequence number transmitter status for the unacknowledged mode bearer after or as part of the make-before-break handover;
preserving the downlink data packet sequence number transmitter/receiver status at the source radio network node for the unacknowledged mode bearer by using the same downlink data packet sequence number transmitter/receiver status for the unacknowledged mode bearer before and after the make-before-break handover; and
transmitting, from the source radio network node to the target radio network node, control signaling indicating the preserved downlink data packet sequence number transmitter/receiver status at the source radio network node for the unacknowledged mode bearer.