Communication system and communication method

摘要

During a period of parallel-like radio communication with two or more first base stations, the first base station designates a second base station correlated with one of the two or more first base stations, and temporarily suspends the radio communication in accordance with a first communications standard to issue, to a mobile station, a request of measurement for the designated second base station. The first base station receives a result of the measurement for the designated second base station. The first base station notifies the mobile station of a handover from the first communications standard to a second communications standard, and also notifies the mobile station of a request for starting a coordination mode in which the two or more second base stations including the designated second base station establish communication with the mobile station in coordination with each other.

主权项

1. A communication system comprising:
a plurality of first base stations for establishing radio communication with a mobile station in accordance with a first communications procedure; a plurality of second base stations for establishing radio communication with the mobile station in accordance with a second communications procedure, the plurality of second base stations being arranged while being correlated with the plurality of first base stations, respectively, and in each set of the first base station and the second base station correlated with each other, being substantially identical with a cell range of the second base station; wherein the mobile station is configured to start multipoint radio communication with two or more of the first base stations; wherein the first base station is configured to: when the multipoint radio communication with the two or more first base stations is established, designate, for the mobile station, the second base station correlated with one of the two or more first base stations, and request the mobile station temporarily suspend the radio communication in accordance with the first communications procedure and to perform measurement only for the designated second base station; and wherein the first base station is further configured to determine, based on a result of the measurement for the designated second base station, whether or not a handover from the first communications procedure to the second communications procedure is possible and whether or not a coordination mode in which the two or more second base stations including the designated second base station establish communication with the mobile station in coordination with each other is validated, and when it is determined that the handover is possible and that the coordination mode is validated, notify the mobile station of a request for activating the coordination mode as well as the request for starting the handover, when it is determined that the handover is possible but the coordination mode cannot be validated, notify the mobile station of a request for starting the handover.