Method for controlling handover, user equipment, base station, and radio communication system

A user equipment, comprising:

• one or more circuits configured to
• perform radio communication with a first base station over a communication channel formed by carrier aggregation of a plurality of component carriers;
• control a handover from the first base station to a second base station, wherein
• the one or more circuits are further configured to
• receive, from the first base station, scheduling information of a first component carrier of the plurality of component carriers according to a cross scheduling method, and scheduling information of a second component carrier of the plurality of component carriers according to a straight scheduling method;
• receive a command, from the first base station, to perform the handover of the communication channel formed by carrier aggregation of the plurality of component carriers;
• cause transfer of the first component carrier of the plurality of component carriers in the first base station to a first transferred component carrier in the second base station;
• and
• stop reception of the scheduling information of the first component carrier of the plurality of component carriers in the first base station.

A base station, comprising:

• one or more circuits configured to
• perform radio communication with a user equipment over a communication channel formed by carrier aggregation of a plurality of component carriers;
• and
• control a handover to another base station by the user equipment, wherein
• the one or more circuits are further configured to
• transmit scheduling information of a first component carrier of the plurality of component carriers according to a cross scheduling method, and scheduling information of a second component carrier of the plurality of component carriers according to a straight scheduling method;
• command the user equipment to perform the handover of the communication channel formed by carrier aggregation of the plurality of component carriers, such that transfer of the first component carrier of the plurality of component carriers in the base station to a first transferred component carrier in the other base station is caused;
• and
• stop transmission of the scheduling information of the first component carrier of the plurality of component carriers in the base station.

A method for controlling a handover from a first base station to a second base station by a user equipment that performs radio communication over a communication channel formed by carrier aggregation of a plurality of component carriers, the method comprising:

• receiving, by the user equipment from the first base station, scheduling information of a first component carrier of the plurality of component carriers according to a cross scheduling method, and scheduling information of a second component carrier of the plurality of component carriers according to a straight scheduling method;
• receiving, by the user equipment from the first base station, a command to perform the handover of the communication channel formed by carrier aggregation of the plurality of component carriers;
• causing, by the user equipment, transfer of the first component carrier of the plurality of component carriers in the first base station to a first transferred component carrier in the second base station;
• and
• stopping, by the user equipment, reception of the scheduling information of the first component carrier of the plurality of component carriers in the first base station.

A method for controlling a handover from a first base station to a second base station by a user equipment that performs radio communication over a communication channel formed by carrier aggregation of a plurality of component carriers, the method comprising:

• transmitting, from the first base station to the user equipment, scheduling information of a first component carrier of the plurality of component carriers according to a cross scheduling method, and scheduling information of a second component carrier of the plurality of component carriers according to a straight scheduling method;
• commanding, by the first base station, the user equipment to perform the handover of the communication channel formed by carrier aggregation of the plurality of component carriers, such that transfer of the first component carrier of the plurality of component carriers in the first base station to a first transferred component carrier in the second base station is caused;
• and
• stopping, by the first base station, transmission of the scheduling information of the first component carrier of the plurality of component carriers in the first base station.