Frequency circle with radius D Reuse Patterns (a)Frequency reuse pattern for N=4 (b)Frequency reuse pattern for N =7 N=2+J2+0×, 1,J=0,1,2,3,. N: 1,3,4,7,9,12,13, 16,19,21, (c)Black cells indicate a frequency reuse for N =19 Frequency Reuse Patterns N = I2 + J2 + (I × J), I, J = 0, 1, 2, 3, . N: 1, 3, 4, 7, 9, 12, 13, 16, 19, 21,