Patent ID: 11882613
Assignee: SONY GROUP CORPORATION
Field: Digital communication (Electrical engineering)
Classification: CPC H | IPC H

Claim 9:
10. A method of communicating data by a terminal device in a wireless telecommunication system, the wireless telecommunication system comprising a first radio access node and a second radio access node, the method comprising:
establishing a radio resource control, RRC, connection with the first radio access node and entering an RRC connected mode for communicating the data between the terminal device and the first radio access node in accordance with one or more parameters configured by the first radio access node and associated with the terminal device,
entering 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,
communicating the same first data between the terminal device and the first radio access node and between the terminal device and the second radio access node,
determining that a radio link failure has been detected in respect of at least the first radio access node,
transmitting to the second radio access node a re-establishment request message,
receiving from the second radio access node a re-establishment response message, the re-establishment response message being transmitted by the second radio access node in response to the re-establishment request message and without the second radio access node requesting context information comprising the one or more parameters associated with the terminal device from the first radio access node after receiving the re-establishment request message,
communicating second data between the terminal device and the second radio access node,
before determining that the radio link failure criteria are satisfied in respect of at least the first radio access node, receiving a security key associated with the second radio access node, and
calculating an authentication token based on the security key associated with the second radio access node,
wherein the re-establishment request message comprises the authentication token.