| 摘要 |
Utilizing a frequency-bandwidth limited IMT frequency band of 3GHz, requirements of IMT-Advanced; that is, 100 Mbps for high speed movement and 1 Gbps for low speed movement in the downlink are satisfied. A communication system performs radio communication between a base station apparatus 40a and a mobile station apparatus 50 using a plurality of frequency layers having frequency bands different from each other, wherein the base station apparatus 40a assigns a downlink cell common control channel and a downlink cell common traffic channel to a low-frequency layer, and assigns a downlink cell dedicated control channel and a downlink cell dedicated traffic channel to a low-frequency layer and/or a high-frequency layer according to a downlink channel status and a communication requirement of the mobile station apparatus 50. |
