Nvidia Corporation

Olivier Jean

Tim Rogers

Fabrice Nabet

A method of detecting an error in a security mode configuration procedure conducted at a radio access network is provided. A cell update message is transmitted which causes the radio access network to abort a security mode configuration procedure. After the transmission of an update message, a new security mode configuration is received and the original security mode configuration is replaced with a new security mode configuration. A security mode configuration check is performed on a received downlink message using the new security mode configuration. If the security mode configuration check fails, a further security mode configuration check is performed on the downlink message to detect an error in the security mode configuration procedure. If it is determined there has been an error in the security mode configuration procedure, security mode configuration checks are performed on further downlink messages received from the network using the original security mode configuration.

Security mode configuration procedures in wireless devices

A method for handling error recovery at a user equipment is provided herein. In one embodiment, the method includes: maintaining first and second communication channels between the user equipment and a radio access network; storing a plurality of control messages in a buffer for transmission over the first communication channel; detecting if the first communication channel is disabled; initiating a recovery procedure using the second communication channel that includes restoring the first communication channel using the second communication channel and sending a further message to one of the one or more buffers for transmission on the restored first communication channel; and in response to detecting that the first communication channel is disabled, moderating control messages stored in the one or more buffers.

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Sophia Antipolis, France

Olivier Jean