Granted Patent B2

US 8,917,863 · App. 13/582,772 · Granted Dec 23, 2014

Inventors: Thomas Ahrndt (Ottobrunn, DE); Martin Kuipers (Dallgow-Dëberitz, DE)

Assignee: Nokia Siemens Networks Oy

H04M3/002H04B3/464H04M11/062

Abstract

Claims (51)

1. A data processing method in a digital subscriber line environment, the method comprising:

determining a flat noise margin TARSNRvn based on an actual noise determined and based on a maximum noise expected and by

TARSNRvn

=

1

NSC

⁢

∑

i

=

0

NSC

-

1

⁢

TARSNRps

⁡

[

i

]

wherein

NSC is a number of subcarriers, and

TARSNRMps is a target signal-to-noise ratio (SNR) margin per subcarrier; and

initializing a device using the flat noise margin.

2. The method according to claim 1 , which comprises adjusting a size of the flat noise margin via bit-swapping after initializing the device.

3. The method according to claim 1 , which comprises:

determining the flat noise margin by a management system,

based on an actual noise determined by the device, which is conveyed to the management system; and

based on a maximum noise expected as determined by a management system;

conveying the flat noise margin to the device.

4. The method according to claim 3 , which comprises determining the maximum noise expected based on an FSAN model.

5. The method according to claim 3 , which comprises determining the maximum noise expected based on a Virtual Noise information.

6. The method according to claim 3 , which comprises determining a size of the flat noise margin by distributing frequency-dependent portions of the noise determined by the management system across the frequency range.

7. The method according to claim 3 , which comprises setting the flat noise margin such that an integral of the noise over a frequency of the flat noise margin corresponds to an integral of the noise over the frequency of a frequency-dependent noise margin.

8. The method according to claim 1 , which comprises determining the target SNR margin per subcarrier by

TARSNRMps[i]=VN[i ]+( H log [ i]−QLN[i ])+ TARSNRM,

wherein

VN[i] is a virtual noise with a transmitter-referred shape;

TARSNRM indicates a target SNR margin;

H log [i] describes channel characteristics;

QLN[i] indicates a quiet line noise; and

[i] indicates a subcarrier index.

9. The method according to claim 8 , which comprises:

( QLN[i]−H log [ i ])= TX power — dBm[i]−SNR[i],

wherein

TXpower_dBm[i] is an actual frequency-dependent transmit power spectral density; and

SNR[i] is a frequency-dependent signal-to-noise ratio.

10. The method according to claim 1 , wherein the device is a customer premises equipment or a central device.

11. A communications device, comprising a processing unit configured for executing the method according to claim 1 .

12. The device according to claim 11 , wherein the device is associated with a customer premises equipment or a digital subscriber line access multiplexer.

13. A communication system, comprising the device according to claim 11 .

Assignments (9)

Continuity (1)