Patent ID: 8483184
Filing Date: 2013-07-09
Classification: H04W

Abstract:
1. A handover control method for selecting a target base station for handover of a mobile station from among a plurality of base stations, the handover control method comprising: collecting measurement data that indicates communication quality of uplink and downlink paths between the mobile station and each of a plurality of first base stations belonging to a first communications system, and that indicates communication quality of uplink and downlink paths between the mobile station and each of a plurality of second base stations belonging to a second communications system; evaluating which first base station is optimal for uplink, as well as which first base station is optimal for downlink, from among the first base stations belonging to the first communications system, and evaluating which second base station is optimal for uplink, as well as which second base station is optimal for downlink, from among the second base stations belonging to the second communications system, based on the collected measurement data; determining which one of a plurality of communications systems including the first communications system and the second communications system is to be used and which link has priority, either uplink or downlink, according to a class of data services that the mobile station uses in radio communication, after both said evaluating for the first communications system and said evaluating for the second communications system are performed; selecting, when the first communications system is determined to be used, as a target base station for handover the first base station that belongs to the first communications system and has been determined as being optimal for the link determined to have priority; and selecting, when the second communications system is determined to be used, as a target base station for handover the second base station that belongs to the second communications system and has been determined as being optimal for the link determined to have priority.