Patent ID: 8767619

Claim:
A method comprising: (i) a radio access network (RAN) transmitting on a plurality of channels; (ii) for each channel in the plurality of channels, the RAN transmitting on a plurality of subcarriers, wherein each subcarrier defines a sequence of frames, each frame respectively defining a sequence of time slots, wherein the RAN transmits symbols in each of a plurality of the time slots, and wherein the RAN normally transmits at at least a nominal power level on each of the subcarriers; (iii) identifying, from among the plurality of subcarriers, a subcarrier that is likely to cause adjacent carrier interference between a first wireless device operating on a first group of subcarriers and a second wireless device operating on a second group of subcarriers, (iv) transmitting null symbols on the identified subcarrier, wherein the null symbols are transmitted: (a) in a first time slot of an initial frame; and, (b) with a non-zero power level less than the nominal power level associated with the identified subcarrier, and (v) transmitting subsequent symbols on the identified subcarrier, wherein the respective power level of each of the subsequent symbols is successively increased for each subsequent timeslot, for at least the duration of the initial frame.