Wireless communication apparatus, wireless communication system, and wireless communication terminal

Abstract

A wireless communication apparatus can communicate with a wireless communication terminal that performs a carrier aggregation by use of the component carriers of a plurality of communication cells having different synchronization timings. In a case where while the synchronization of an uplink has been established in a first component carrier that serves as a reference among the other ones of the plurality of component carriers used by the wireless communication terminal, the wireless communication terminal uses a second component carrier, which is associated with the first component carrier, to establish the synchronization of an uplink, the wireless communication apparatus uses an identifier, which is unique to the wireless communication terminal, to transmit, to the wireless communication terminal, an individual control signal including an adjustment value of the transmission timing of the wireless communication terminal. Therefore, when the wireless communication terminal, which performs a carrier aggregation, manages the synchronization timings of a plurality of uplinks, the wireless communication apparatus can quickly and efficiently perform a process to adjust the synchronization timings.