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

Claim 12:
13. A method of operation for terminal device in a wireless telecommunication system comprising the terminal device, a first radio access node and a 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 terminal device receiving a counter check request message from the second radio access node and transmitting a counter check response message to the second network access node in response to receiving the counter check request, wherein the counter check response message provides the second network access node with an indication of whether 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.