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

Claim 24:
25. A source radio network node comprising:
communication circuitry; and
processing circuitry configured to:
establish, with a wireless device, an unacknowledged mode bearer with a source link;
transmit, 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;
preserve the downlink data packet sequence number transmitter status at the source radio network node for the unacknowledged mode bearer by using the same downlink data packet sequence number transmitter status for the unacknowledged mode bearer before and after the make-before-break handover; and
transmit, from the source radio network node to the target radio network node, control signaling indicating the preserved downlink data packet sequence number transmitter status at the source radio network node for the unacknowledged mode bearer.