| 摘要 |
PROBLEM TO BE SOLVED: To obtain a communication system capable of improving transmission efficiency.SOLUTION: In the communication system, a base station allocates a frequency band to a user terminal by the selection of either one of a continuous allocation method that continuously allocates frequency bands and a discrete allocation method that discretely allocates frequency bands. The base station notifies the user terminal of the frequency band allocated to the user terminal by a control signal, and instructs the changeover of the allocation method using a bit in the control signal different from a bit indicative of the allocated frequency band. When selecting the discrete allocation method, the base station divides the total amount of the frequency bands to be allocated into two sub-blocks, and allocates a frequency band to the user terminal by determining a layout on a frequency axis on the basis of each sub-block. Based on the control signal received from the base station, the user terminal obtains the frequency band allocated to the self-terminal. |
