Replay protection for resume procedure

A method for resuming a connection performed at a user equipment (UE) comprising:

• receiving, from a first network node, at the UE, a resume request message including a freshness parameter and a UE context;
• generating, at the UE, an authentication token based on the freshness parameter and the UE context;
• sending, to the first network node, a resume response message including the authentication token;
• and
• receiving, from the first network node at the UE, a connection setup message including an omission indication which instructs the UE to skip to send a resume complete message when there is no data transmission after the resume response message.

A network node for resuming a connection, comprising:

• at least one processing circuitry;
• and
• at least one storage that stores processor-executable instructions, when executed by the processing circuitry, causes the network node to:
• receive, from a first network node, a user equipment (UE) context prepopulated by the first network node;
• send, to a UE, a resume request message including a freshness parameter and the UE context;
• receive, from the UE, a resume response message including an authentication token generated based on the freshness parameter and the UE context;
• and
• send, to the UE, a connection setup message including an omission indication which instructs the UE to skip to send a resume complete message when there is no data transmission after the resume response message.

A user equipment (UE) for resuming a connection, comprising:

• at least one processing circuitry;
• and
• at least one storage that stores processor-executable instructions, when executed by the processing circuitry, causes the UE to:
• receive, from a first network node, a resume request message including a freshness parameter and a UE context;
• generate an authentication token based on the freshness parameter and the UE context;
• send, to the first network node, a resume response message including the authentication token;
• and
• receive, from the first network node, a connection setup message including an omission indication which instructs the UE to skip to send a resume complete message when there is no data transmission after the resume response message.