Patent ID: 11903065
Assignee: SONY GROUP CORPORATION
Field: Digital communication (Electrical engineering)
Classification: CPC H | IPC H

Claim 11:
12. A method of operation for a second radio access node in a wireless telecommunication system comprising a terminal device, a first radio access node and the second radio access node, wherein the first and second radio access nodes are configured to support a dual connectivity mode of operation for the terminal device in which the first radio access node acts as a master radio access node and the second radio access node acts as a secondary radio access node and in which the same data are communicated between the terminal device and the first radio access node and between the terminal device and the second radio access node, wherein the method comprises the second radio access node transmitting a counter check request message to the terminal device and receiving a counter check response message from the terminal device and determining from the counter check response message if there is a mismatch in a count of packets transmitted to the terminal device on a data radio bearer and a count of packets received by the terminal device on the data radio bearer.