In an OFDM-TDMA power line communication system, time slot and carrier
frequencies are assigned in a manner that reallocates time slots and
carrier frequencies to enhance the efficiency of utilization of
bandwidth. The reassignments are communicated between transmitting and
receiving stations by transmitting tone maps that designate the
reassignment of the time slots and carriers. Several variations are
presented depending upon the circumstances of channel use and prior
assignment of time slots and channels.