Described are systems, devices, methods, and computer program products for user data transport over a control plane in a communication system. For example, a method comprises determining a size of user data to be transmitted over a control plane between user equipment and at least one network entity of a communication system. The method also comprises, in response to determining that the size of the user data to be transmitted is below at least a threshold for small data transport, generating a control plane message comprising the user data to be transmitted in a small data container for transport of user data over the control plane. The method further comprises transmitting the generated control plane message between the user equipment and the at least one network entity of the communication system.