A cellular service provider decides to use a digital TDMA scheme which can tolerate asignal-to-interference ratio of 15 dB in the worst case. Find the optimal value of N for (a)omni-directional antennas (b) 120 degree sectoring and (c) 60 degree sectoring. Shouldsectoring be used? If so, which case should be used? Assume a path loss exponent of n = 4.