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

Claim 0:
1. A method performed by a wireless device, the method comprising:
establishing, to a source radio network node, an unacknowledged mode bearer with a source link;
receiving a handover command that commands the wireless device to perform a make-before-break handover from the source link to a target link;
performing the make-before-break handover from the source link to the target link, the make-before-break handover comprising establishing a connection to a target radio network node with the target link and resetting a downlink data packet sequence number receiver status for the unacknowledged mode bearer after or as part of the make-before-brake handover;
after receiving the handover command, continuing to receive from the source link downlink data packets for the unacknowledged mode bearer, until after the wireless device establishes the connection with the target link;
after the wireless device establishes the connection with the target link, receiving from the target link downlink data packets for the unacknowledged mode bearer;
preserving a downlink data packet sequence number receiver status at the wireless device for the unacknowledged mode bearer, by using the same downlink data packet sequence number receiver status for the unacknowledged mode bearer before and after the make-before-break handover; and
based on the downlink data packet sequence number receiver status as preserved, monitoring for data packets received in duplicate from the source link and the target link for the unacknowledged mode bearer.