Apple Inc.
Systems, methods and devices for congestion control for transport of user data via a control plane

Abstract:

A mobility management entity (MME) can enable overload control of data transmission via control plane in an evolved packet system (EPS), optimized for cellular internet of things (CIoT), by use of a control plane data backoff timer that suppresses the use of control plane for data transfer by a user equipment (UE) for the duration of the timer. For example, an MME sends a control plane data backoff timer to a UE that suppresses the use of control plane for data transfer for the duration of the timer. Alternatively, when an MME load reaches a threshold, an MME triggers an Overload Start message and sends it to the RAN node, so that the RAN node can restrict selecting this MME for UEs requiring data transfer using control plane CIoT optimization. The RAN node can reject these UEs and return a wait timer in an RRC Connection Release message.