A SerializerDeserializer apparatus comprises a serializer adapted to take N parallel bits of data and shifts them out serially at N times a clock speed to a transmitter, a transmitter enable block adapted to start the serializer means, and a count block. The various types of filters as well as round trip time estimators that are used in the invention to determine when the rate of the multicast transmission should be reduced to alleviate congestion. The mobile terminal then selects a suitable transport format from the set, for example in dependence on propagation channel conditions, for transmission of a scheduled transreceive at least one UL mission. The monitors independently perform FFT processes over this entire spectrum, but at a low frequency resolution which is no higher than needed to distinguish channels.