Patent ID: 7313130

Claim:
A method for providing extended upstream data transmission in a band having a lowest frequency f 0 by an end user terminal unit in an asymmetric digital subscriber line communication between a central office terminal unit and the end user terminal unit, comprising the steps of: providing a target rate of upstream data transmission; determining a plurality of sets of values of: an extension frequency f 2 that is higher than a frequency f 1 for upstream data transmission, f 1 being a frequency established for non-extended upstream data transmission, the region bounded by f 1 and f 2 being an extension band for upstream data transmission, and a maximum power level S 2 for the extension band determined by the extension frequency in the sets of values; selecting, using both terminal units, a selection set of values performing a signal-to-noise ratio determination for each of the sets of values and determining the set of values that results in an upstream data rate that approximates the target rate; and transmitting data upstream by the end user terminal unit using the selection set of values, wherein f 1 corresponds to a minimum frequency for downstream data transmission, and wherein a maximum power level S 1 in a region bounded by f 0 and f 1 is determined by selecting a total power P for the upstream data transmission, and then computing S 1 = P - S 2 ⁡ ( f 2 - f 1 ) f 1 - f 0 .