RADIO COMMUNICATION SYSTEM, RADIO STATION, RADIO TERMINAL, COMMUNICATION CONTROL METHOD, AND NON-TRANSITORY COMPUTER READABLE MEDIUM
A radio terminal ( 3 ) can perform carrier aggregation using a first cell ( 10 ) of a first radio station ( 1 ) and a second cell ( 20 ) of a second radio station ( 2 ). The first radio station ( 1 ) or the second radio station ( 2 ) transmits constraint information to the radio terminal ( 3 ). The constraint information contains an information element necessary to specify a reception constraint and/or transmission constraint related to the first cell ( 10 ) and/or the second cell ( 20 ) when the carrier aggregation is performed. The reception/transmission constraint is a constraint related to downlink signal reception/uplink signal transmission by the radio terminal over one or more subframe periods of the primary cell ( 10 ) and the secondary cell ( 20 ). It is thus, for example, possible to contribute to reduction in wasteful power consumption in the radio terminal in the carrier aggregation of a plurality of cells served by different radio stations.
1 . A radio terminal comprising:
a memory storing instructions; and
at least one processor configured to process the instructions to:
perform Dual Connectivity using a first cell of a first radio station and a second cell of a second radio station; and
receive, from the second radio station, a period related to the secondary cell by using a Signaling Radio Bearer in the Dual Connectivity.
2 . The radio terminal according to claim 1 , wherein the period related to uplink.
3 . A radio base station configured to serve a second cell, the second base station comprising:
a processor configured to perform Dual Connectivity using a first cell of a first radio station and the second cell; and
a transceiver configured to send, to a radio terminal, a period related to the secondary cell by using a Signaling Radio Bearer in the Dual Connectivity.
4 . The radio base station according to claim 3 , wherein the period related to uplink.
5 . A method for a radio terminal comprising:
performing Dual Connectivity using a first cell of a first radio station and a second cell of a second radio station; and
receiving, from the second radio station, a period related to the secondary cell by using a Signaling Radio Bearer in the Dual Connectivity.
6 . The radio terminal according to claim 5 , wherein the period related to uplink.
7 . A method for a radio base station configured to serve a second cell, the second base station comprising:
performing Dual Connectivity using a first cell of a first radio station and the second cell; and
sending, to the radio terminal, a period related to the secondary cell by using a Signaling Radio Bearer in the Dual Connectivity.
8 . The radio base station according to claim 7 , wherein the period related to uplink.