Patent ID: 8126495

Claim:
A communication apparatus comprising: a controller configured to determine a step function in a fractional frequency reuse for controlling downlink transmission power in a wireless communication system for performing wireless communication with a user terminal, the step function being given by p ( PSD ) ⁡ ( f ) = { α 1 · Δ · ⌊ f Δ ⌋ + β 1 for 0 ≤ f < Δ ⁡ ( M + 1 ) α 2 · Δ · ⌊ f Δ ⌋ + β 2 for Δ ⁡ ( M + 1 ) ≤ f < Δ ⁢ ⁢ N where α 1 and α 2 are slopes, Δ is a step width, f is a frequency, β 1 and β 2 are segments, M is a break point as a bending of a step function, and N is a number of steps; and a transmitter configured to transmit a signal having a power profile according to the step function in a direction of a frequency.