Patent ID: 9155025
Filing Date: 2015-10-06
Classification: H04W

Abstract:
1. A method for reducing the number of unsuccessful service change attempts of a first mobile terminal via a mobile network to a further terminal by establishing a call connection for providing a first service or by establishing a call connection for providing a second service, the method comprising the following steps performed by the first mobile terminal: receiving a first indication signal indicating that a service change towards the second service is temporarily unavailable from a mobile network node administrating an established call connection for providing the first service, and in response to receiving the first indication signal, refraining from requesting a service change towards the second service until reception of a further indication signal from the mobile network node indicating that a service change is available again; wherein the first signal indicating that a service change is unavailable comprises an unavailability cause indication indicating a cause for the unavailability of the service change, and the cause for the unavailability of the service change comprises one or more of: a video telephony service being unavailable for the first mobile terminal, a Serving Radio Support Node relocation, a change of a core network node administrating the first mobile terminal, an inter MSC handover, an activation of a supplementary service for the call connection wherein the supplementary service is provided for the first service and not for the second service, a change of a Radio Network Controller serving the first mobile terminal, the first and/or further mobile terminal not supporting the second service, or a radio network node handling the call connection does not support a bearer type associated with the second service.