Method for controlling handover, user equipment, base station, and radio communication system
First Claim
1. 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 each component carrier of the plurality of component carriers respectively according to a scheduling information transmission method that is a cross 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;
causing transfer of a 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, the first component carrier being operated according to the cross scheduling method; 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.
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Abstract
Provided is 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 aggregating a plurality of component carriers, wherein scheduling information on each component carrier is transmitted to the user equipment according to either of a straight scheduling method and a cross scheduling method, and the method includes at the first base station, commanding first the user equipment to perform a handover from the first base station to the second base station on a second component carrier to be operated according to the straight scheduling method in the second base station, when it is determined that a handover on a first component carrier following the cross scheduling method is to be executed.
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Citations
13 Claims
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1. 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:
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transmitting, from the first base station to the user equipment, scheduling information of each component carrier of the plurality of component carriers respectively according to a scheduling information transmission method that is a cross 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; causing transfer of a 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, the first component carrier being operated according to the cross scheduling method; 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. - View Dependent Claims (2, 3, 4, 5)
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6. A user equipment, comprising:
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a radio communication circuit that performs radio communication with a first base station over a communication channel formed by carrier aggregation of a plurality of component carriers; a control circuit that controls a handover from the first base station to a second base station and a quality measuring circuit that measures a channel quality of the communication channel between the user equipment and the first base station, wherein the radio communication circuit is configured to receive, from the first base station, scheduling information of each component carrier of the plurality of component carriers respectively according to a scheduling information transmission method that is a cross scheduling method, and 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, and the control circuit is configured to cause transfer of a 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, the first component carrier being operated according to the cross scheduling method, and stop reception of the scheduling information of the first component carrier of the plurality of component carriers in the first base station. - View Dependent Claims (7, 8, 9)
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10. A base station, comprising:
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a radio communication circuit that performs radio communication with a user equipment over a communication channel formed by carrier aggregation of a plurality of component carriers; and a control circuit that controls a handover to another base station by the user equipment, wherein the radio communication circuit is configured to transmit scheduling information of each component carrier of the plurality of component carriers respectively according to a cross scheduling method, the control circuit is configured to 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 a 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, the first component carrier being operated according to the cross scheduling method, and the control circuit is further configured to stop transmission of the scheduling information of the first component carrier of the plurality of component carriers in the base station. - View Dependent Claims (11)
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12. 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:
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receiving, by the user equipment from the first base station, scheduling information of each component carrier of the plurality of component carriers respectively according to a scheduling information transmission method that is a cross scheduling method; measuring, by the user equipment, a channel quality of the communication channel formed by carrier aggregation of the plurality of component carriers; transmitting, by the user equipment to the first base station, measurement information of the channel quality; 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 transfer of a 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, the first component carrier being operated according to the cross scheduling method; 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. - View Dependent Claims (13)
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Specification