User equipment and mobility management entity and methods for periodic update in cellular networks

A non-transitory computer-readable storage medium that stores instructions for execution by one or more processors to perform operations for communication in a wireless network, the operations to configure the one or more processors to:

• transmit, for reception at a PS node of the mobile network, a registration message for registration with the PS node and a CS node of the mobile network and for an establishment of a signaling session between the PS node and the CS node for the UE;
• and
• transmit, for reception at the PS node, a periodic registration update message for remaining registered with the PS node;
• wherein the periodic registration update message further includes a signaling permission indicator for a re-establishment, by the PS node, of the signaling session between the PS node and the CS node for the UE.

A method of operation in a mobile network that supports packet-switched (PS) and circuit-switched (CS) communication, comprising:

• transmitting, for reception at a PS node of the mobile network, a registration message for registration with the PS node and a CS node of the mobile network and for an establishment of a signaling session between the PS node and the CS node for the UE;
• and
• transmitting, for reception at the PS node, a periodic registration update message for remaining registered with the PS node;
• wherein the periodic registration update message further includes a signaling permission indicator for a re-establishment, by the PS node, of the signaling session between the PS node and the CS node for the UE.

A packet-switched (PS) node to operate in a mobile network that supports packet-switched (PS) and circuit-switched (CS) communication, the PS node comprising hardware processing circuitry to:

• receive, from a User Equipment (UE), a registration message for registration with the PS node and a CS node of the mobile network and for an establishment of a signaling session between the PS node and the CS node for the UE;
• register the UE with the PS node and the CS node;
• establish the signaling session between the PS node and the CS node;
• and
• receive, from the UE, a periodic registration update message for remaining registered with the PS node that includes a signaling permission indicator for a re-establishment, by the PS node, of the signaling session between the PS node and the CS node for the UE.