Patent ID: 8503398

Claim:
A radio communication system which performs handover from a first radio communication network to a second radio communication network employing a radio communication method different from that of the first radio communication network, comprising: a link controller configured to establish a radio link with the first radio communication network or the second radio communication network; an entity configured to perform communication by using at least one of the first radio communication network and the second radio communication network; and a handover controller configured to control handover from the first radio communication network to the second radio communication network on the basis of a request from the entity, wherein the entity transmits a service quality acquisition request to the handover controller to request to be reported, at regular intervals, about service quality used by the entity, and when acquiring the service quality acquisition request from the entity, the handover controller calculates a prediction value of future service quality at the regular intervals on the basis of communication quality of the radio link notified from the link controller, and then reports the calculated prediction value to the entity.