Handover method in mobile network, mobile terminal and mobile network system thereof

A mobile communication terminal comprising:

• a signal intensity detection unit configured to detect reception signal intensity of a plurality of mobile networks;
• a transmission unit configured to transmit a quality of service (QoS) requirement for each of a plurality of mobile services associated with the mobile communication terminal the QoS requirement indicating information about quality requested for a corresponding mobile service, wherein at least two of the plurality of mobile services have different QoS requirements;
• and
• a reception unit configured to receive an instruction for performing handover of a first mobile service to a base station but not handover a second mobile service among the plurality of mobile services to the base station,
• wherein a mobile network provided by the second base station is selected based on first QoS requirement of the first mobile service and second QoS requirement of the second mobile service.

A mobile network system comprising:

• a reception unit configured to receive information about reception signal intensity of a plurality of mobile networks and a quality of service (QoS) requirement for each of a plurality of mobile services provided on a user terminal, the QoS requirement representing information about requested quality for a corresponding mobile service;
• a first handover determination unit configured to determine connectable mobile networks among the plurality of mobile networks using information about reception signal intensity;
• and
• a second handover determination unit configured to determine, for each of the plurality of mobile services, one of mobile networks to which the user terminal can be connected for handover using QoS requirement of each of the plurality of mobile services, wherein a first mobile service of the plurality of mobile services is handed over to a base station based on QoS requirement of the first mobile service but a second mobile service of the plurality of the mobile services is not handed over to the network based on QoS requirement of the second mobile service.