Patent ID: 7082304

Claim:
A radio communication system comprising: a mobile terminal device configured to measure a communication quality of a radio link, which is currently used, and send communication quality information including the measured communication quality to a base station device, said mobile terminal moving at a speed; the base station device including a communicating unit configured to receive the communication quality information from the mobile terminal device, a moving speed estimating unit configured to estimate the moving speed of the mobile terminal device based on the communication quality shown in the communication quality information, a switching discriminating unit configured to discriminate if it is necessary to switch from the radio link which is currently used to an other radio link based on the moving speed of the mobile terminal device estimated by the moving speed estimating unit, a radio link switching unit configured to switch the radio link used for the data communication from the radio link which is currently used to the other radio link when the switching discriminating unit discriminates it is necessary to switch from the radio link which is currently used to the other radio link, and a switching instruction generating unit configured to generate a switching instruction to instruct the mobile terminal device to switch the radio link used for the data communication when the radio link switching unit switches the radio link, and sending the switching instruction generated to the mobile terminal device through the communicating unit; and a plurality of radio links including the radio link which is currently used and the other radio link, said plurality of radio links are configured to communicate between the mobile terminal device and the base station device, wherein at least one of the mobile terminal device or the base station device is configured to select between a soft handover method and a non-soft handover method for handing over said mobile terminal device from the radio link which is currently used to the other radio link based on the moving speed.