SECURITY PROCESSING TO RESUME RRC FROM INACTIVE STATE Russian patent published in 2021 - IPC H04W12/04 H04W76/19 H04W76/27 

FIELD: wireless communication networks.

SUBSTANCE: wireless device receives an RRC suspend message from the network, including a security update parameter, and, in response to the RRC suspend message, it goes to the inactive RRC state and stores the first security context. The wireless device contains a processing scheme that is performed with the possibility, when trying to switch to the connected RRC state, of: generating a second security context using the security update parameter received in the RRC suspend message; sending an RRC resume request message to the network and, in response to one of the following second security context drop events: receiving an RRC reject message from the network in response to an RRC resume request message; expiration of a timer started when sending an RRC resume request message without receiving a response message from the network; and performing a cell reselection before receiving a message from the network in response to an RRC resume request message.

EFFECT: invention is aimed at maintaining the synchronization of the security context between the wireless device and the network when the wireless device resumes from an inactive state.

72 cl, 24 dwg