System and method for selectable mask for LDSL
AssigneeBrooktree Broadband Holding, Inc.
InventorsPatrick Duvaut, Ehud Langberg
Life of this patent
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Abstract
The present invention overcomes various problems by defining two upstream masks (U1, U2) and two downstream masks (D1, D2) and using a mask selectable system for the long reach digital subscriber line (LDSL), in which a unique modem feature is activated during handshake to automatically check for physical layer status in terms of spectral compatibility and, thus, automatically optimize the boosted mode with the use of the mask selectable system choose the best combination of upstream/downstream masks in any physical layer noise scenario.
Claims9
A DSL system comprising:
- mask selection criteria, the criteria comprising:
- a weighted ratio of upstream rates and downstream rates;
- and
- a cost function based in part upon the weighted ratio, wherein the cost function is defined according to the relation:
- cost
-
-
- function
- =
- (
- 2
-
- x
-
- (
- dsrate
-
- (
- 2
- )
- -
- dsrate
-
- (
- 1
- )
- )
- dsrate
-
- (
- 1
- )
- )
- +
- (
- (
- usrate
-
- (
- 2
- )
- -
- usrate
-
- (
- 1
- )
- )
- usrate
-
- (
- 1
- )
- )
- ,
- wherein dsrate(1) is the downstream rate of a first mask,
- dsrate(2) is the downstream rate of a second mask,
- usrate(1) is the upstream rate of the first mask, and
- usrate(2) is the upstream rate of the second mask;
- and
- a mask-selectable operator configured to select a spectral mask based on the mask selection criteria, wherein the mask-selectable operator selects a spectral mask based in part upon a determination of whether the cost function is greater than a predetermined value.
A selectable mask system comprising:
- mask selection criteria, the criteria comprising:
- a weighted ratio of upstream rates and downstream rates;
- and
- a cost function based in part upon the weighted ratio, wherein the cost function is defined according to the relation:
- cost
-
-
- function
- =
- (
- 2
-
- x
-
- (
- dsrate
-
- (
- 2
- )
- -
- dsrate
-
- (
- 1
- )
- )
- dsrate
-
- (
- 1
- )
- )
- +
- (
- (
- usrate
-
- (
- 2
- )
- -
- usrate
-
- (
- 1
- )
- )
- usrate
-
- (
- 1
- )
- )
- ,
- wherein dsrate(1) is the downstream rate of a first mask,
- dsrate(2) is the downstream rate of a second mask,
- usrate(1) is the upstream rate of the first mask, and
- usrate(2) is the upstream rate of the second mask;
- and
- a mask-selectable operator configured to select a spectral mask based on the mask selection criteria.
A selectable mask system comprising:
- a plurality of predefined upstream spectral masks;
- a plurality of predefined downstream spectral masks;
- a mask-selectable operator configured to select a pair of spectral masks from the plurality of predefined upstream and downstream spectral masks based on:
- a weighted ratio of upstream rates and downstream rates;
- and
- a cost function based in part upon the weighted ratio, wherein the cost function is defined according to the relation:
- cost
-
-
- function
- =
- (
- 2
-
- x
-
- (
- dsrate
-
- (
- 2
- )
- -
- dsrate
-
- (
- 1
- )
- )
- dsrate
-
- (
- 1
- )
- )
- +
- (
- (
- usrate
-
- (
- 2
- )
- -
- usrate
-
- (
- 1
- )
- )
- usrate
-
- (
- 1
- )
- )
- ,
- wherein dsrate(1) is the downstream rate of a first mask,
- dsrate(2) is the downstream rate of a second mask,
- usrate(1) is the upstream rate of the first mask, and
- usrate(2) is the upstream rate of the second mask.
Dependencies are inferred from the claim text.