Synchronizing devices based on a sequence number or key mismatch

A method of an internet-of-things (IoT) device, the method comprising:

• receiving a first request message comprising a first set of parameters;
• determining a security parameter mismatch based on the first set of parameters and a corresponding set of parameters stored in the IoT device, wherein the security parameter mismatch comprises a mismatch of a sequence number (SQN) or a mismatch of a security key;
• generating a nonce in response to the security parameter mismatch;
• generating a synchronization identifier (ID) based on the generated nonce, a device SQN, and a shared secret parameter;
• generating a synchronization encryption key based on the generated nonce, the device SQN, and the shared secret parameter;
• and
• transmitting a response message comprising at least the device SQN and an expected result based on a default ID of the IoT device.

An apparatus in a wireless communication network entity, comprising:

• at least one memory;
• and
• at least one processor coupled with the at least one memory and configured to cause the wireless communication network entity to:
• transmit a first request message comprising a first set of parameters;
• receive a response message comprising an indication of a mismatch of a sequence number (SQN) or a security key, wherein the response message further comprises a device SQN of an internet-of-things (IoT) device, a nonce, and an expected result;
• generate a synchronization identifier (ID) based on the received nonce, the device SQN, and a shared secret parameter;
• generate a synchronization encryption key based on the received nonce, the device SQN, and the shared secret parameter;
• and
• determine an updated SQN based on the device SQN.

A method performed by a wireless communication network entity, the method comprising:

• transmitting a first request message comprising a first set of parameters;
• receiving a response message comprising an indication of a mismatch of a sequence number (SQN) or a security key, wherein the response message further comprises a device SQN of an internet-of-things (IoT) device, a nonce, and an expected result;
• generating a synchronization identifier (ID) based on the received nonce, the device SQN, and a shared secret parameter;
• generating a synchronization encryption key based on the received nonce, the device SQN, and the shared secret parameter;
• and
• determining an updated SQN based on the device SQN.