Telefonaktiebolaget Lm Ericsson (publ)

Marcio Murilo Conte Monteiro

Boris Dortschy

Eduardo Lins De Medeiros

Aldebaro Klautau

Johelden Campos Bezerra

A method and arrangement is proposed for adaptively generating a target noise margin for use on a DSL transmission line. The method includes determining a first quantity representing a current noise power on the line using line parameter data relating to the transmission performance of the line, determining a second quantity representing a worst-case noise power on said line using previously obtained values of the line parameter data, calculating the difference between the first and second quantities to generate a difference value, setting a target noise margin as at least equal to said difference value, and providing the target noise margin for use on the line upon initialisation of the line. In a preferred embodiment, the line parameter data is the bit loading on the line and the first and second quantities are values of the average signal-to-noise ratio on the line derived from the bit loading data.

Dynamic target margin adaptation for DSL transmission lines

A method of determining a number of operating points for spectrum management of a plurality of digital subscriber lines in a communications network, the method comprising the steps of: determining optimization criteria (O) for the digital subscriber lines; determining crosstalk gains (G) for the digital subscriber lines; determining an initial population (P) of operating points (x, . . . , x) where each of the operating points comprises importance ratings for each digital subscriber line of the plurality of digital subscriber lines; calculating new values of crosstalk and power spectrum densities (S) for the digital subscriber lines, by executing spectrum balancing for each operating point until the optimization criteria are fulfilled; calculating a new population of operating points, by executing an evolutionary algorithm; and iteratively performing the steps of calculating until a predefined stopping criterion is fulfilled.

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Belém, Brazil

Marcio Murilo Conte Monteiro