Method and system for performing a handover of a mobile terminal, and mobile terminal intended to be used in a wireless cellular communications network

A system for performing a handover of a mobile terminal from a source base station to a target base station, the source and target base stations being adapted to directly communicate with each other via first respective communication interfaces, the source and target base stations being adapted to communicate via second respective communication interfaces with a core network entity, the core network entity managing subscriptions to services of at least the target base station and authorizing access to said services via handover to only subscribers to said services,

• characterized in that said system implements:
• means for obtaining an authorization ticket provided by the mobile terminal;
• means for performing directly the handover via the first communication interfaces, implemented when the obtained authorization ticket is validated on the basis of a decrypting key associated with the services of the target base station.

A mobile terminal intended to be used in a wireless cellular communications network, the mobile terminal comprising means for receiving signals from at least one base station of the wireless cellular communications network and means for transmitting to a base station of the wireless cellular communications network an indication of services to which the mobile terminal has subscribed as well as measurements reports indicative of a quality of the signals received from at least one base station, characterized in that said mobile terminal comprises:

• means for obtaining an authorization ticket;
• and
• means for transmitting the obtained authorization ticket to a base station together with the indication of services to which the mobile terminal has subscribed and the measurements reports.