Loading patent…
AssigneeNtt Docomo, Inc.
InventorsKazuaki Takeda, Yoshihisa Kishiyama, Sadayuki Abeta, Hiroyuki Ishii
Estimating the term…
The present invention is designed to detect an S-cell efficiently, in a short time, upon carrier aggregation in a HetNet. In a communication system where carrier aggregation is executed between a first carrier (CC #1) and a second carrier (CC #2), a macro base station apparatus (20A) generates a carrier detection signal that makes a mobile terminal apparatus (10) detect the second carrier (CC #2), such that carrier aggregation is executed with the first carrier (CC #1), and transmits the carrier detection signal to an RRH base station apparatus (20B) such that the carrier detection signal is transmitted from the RRH base station apparatus (20B) to the mobile terminal apparatus (10) in the second carrier (CC #2) in which the carrier detection signal can be allocated with a higher density than a reference signal of the first carrier (CC #1). The macro base station apparatus (20A) detects an S-cell based on the received quality of the carrier detection signal fed back from the mobile terminal apparatus (10).
A communication system in which, through carrier aggregation using a first carrier and a second carrier that is allocated in addition to the first carrier, a first base station apparatus and a mobile terminal apparatus communicate using the first carrier, and also a second base station apparatus and the mobile terminal apparatus communicate using the second carrier, wherein:
A base station apparatus that, through carrier aggregation using a first carrier and a second carrier that is allocated in addition to the first carrier, communicates with a mobile terminal apparatus that is connected with another base station apparatus using the second carrier, using the first carrier, the base station apparatus comprising:
A mobile terminal apparatus that, through carrier aggregation using a first carrier and a second carrier that is allocated in addition to the first carrier, communicates with a first base station apparatus using the first carrier and communicates with a second base station apparatus using the second carrier, the mobile terminal apparatus comprising:
A communication method in which, through carrier aggregation using a first carrier and a second carrier that is allocated in addition to the first carrier, a first base station apparatus and a mobile terminal apparatus communicate using the first carrier, and also a second base station apparatus and the mobile terminal apparatus communicate using the second carrier, the communication method comprising the steps in which:
Dependencies are inferred from the claim text.