US 7,551,544 B2
Power control of digital subscriber line
Timo Laakso, Munkkiniemenranta 43, Fin-00330, Helsinki (Finland); and Antti Tommiska, Vuorikummuntie 14 A, Fin-00390, Helsinki (Finland)
Appl. No. 10/520,376
PCT Filed Jul. 03, 2002, PCT No. PCT/FI02/00601
§ 371(c)(1), (2), (4) Date Oct. 21, 2005,
PCT Pub. No. WO2004/006492, PCT Pub. Date Jan. 15, 2004.
Prior Publication US 2006/0153106 A1, Jul. 13, 2006
Int. Cl. H04J 1/12 (2006.01)
U.S. Cl. 370—201 30 Claims
OG exemplary drawing
 
1. A method for controlling a transmission power level in a digital subscriber line, characterized in that transmission power levels of several digital subscriber lines are controlled simultaneously by the method comprising the steps of
measuring crosstalk properties for each subscriber line in different situations;
estimating crosstalk values from the measured crosstalk properties;
organizing the crosstalk values of the different situations;
controlling the transmission power levels using the organized crosstalk values;
taking SNR limitations into account when controlling the transmission power levels; and
making the control of the transmission power levels so that the crosstalk is distributed in such a way that more crosstalk is accepted for lower service class lines.