Orderly leaving within a vectoring group

Patent metadata

Field	Value
Publication number	US-2016248476-A1
Application number	US-201415026025-A
Country	US
Kind code	A1
Filing date	Oct 14, 2014
Priority date	Oct 22, 2013
Publication date	Aug 25, 2016
Grant date	—

Abstract

In accordance with an embodiment of the invention, the method includes detecting a leaving event such that a communication path established between two peer transceivers coupled to the particular subscriber line is to be orderly discontinued. The method further includes, during a pre-disconnection phase following the detection of the leaving event, switching the two peer transceivers into respective OFF power states during first symbol positions and into respective ON power states during second remaining symbol positions, characterizing crosstalk within the vectoring group during the first symbol positions while the second symbol positions are used for regular data communication if any, and definitively switching the two peer transceivers into the respective OFF power states after the crosstalk characterization completes.

First claim

1 . A method for discontinuing communication over a particular communication line forming part of a vectoring group, and comprising detecting a leaving event whereby a communication path established between two peer transceivers coupled to the particular subscriber line is to be orderly discontinued,
wherein the method further comprises, during a pre-disconnection phase following the detection of the leaving event, switching the two peer transceivers into respective OFF power states during first symbol positions and into respective ON power states during second remaining symbol positions, characterizing crosstalk within the vectoring group during the first symbol positions while the second symbol positions are used for regular data communication if any, and definitively switching the two peer transceivers into the respective OFF power states after the crosstalk characterization completes.

2 . A method according to claim 1 , wherein the ON power state of a transceiver is characterized by transmit and receive paths of the transceiver being powered and by a nominal load impedance value close to a characteristic impedance of a transmission medium,
and wherein the OFF power state of the transceiver is characterized by selected or all active components of the transceiver being switched OFF and by a further load impedance value.

3 . A method according to claim 2 , wherein the further load impedance value is different from the nominal load impedance value for at least one of the two peer transceivers.

4 . A method according to claim 1 , wherein the method further comprises configuring a vectoring processor for mitigating crosstalk within the vectoring group based on the so-characterized crosstalk and concomitantly with the two peer transceivers definitively switching into the respective OFF power states.

5 . A method according to claim 1 , wherein the step of characterizing crosstalk within the vectoring group comprises transmitting a sequence of crosstalk probing symbols over a disturber line of the vectoring group during the first symbol positions, measuring crosstalk interference on a victim line of the vectoring group while the crosstalk probing symbols are being transmitted during the first symbol positions, and characterizing a crosstalk channel from the disturber line into the victim line based on the measured crosstalk interference.

6 . A method according to claim 1 , wherein the detected leaving event is a pre-disconnection message issued by one of the two peer transceivers whereby whereby preliminary steps are to be taken before the communication path is effectively torn down.

7 . A transceiver for operating a communication path with a peer transceiver over a particular communication line of a vectoring group,
wherein the transceiver is configured, during a pre-disconnection phase following the detection of a leaving event whereby the communication path is to be orderly discontinued, to switch into an OFF power state during first symbol positions and into an ON power state during second remaining symbol positions, wherein the first symbol positions are used for crosstalk characterization within the vectoring group, and the second symbol positions are used for regular data communication if any, and wherein the transceiver is further configured to definitively switch into the OFF power state after the crosstalk characterization completes.

8 . A transceiver according to claim 7 , wherein the ON power state of the transceiver is characterized by transmit and receive paths of the transceiver being powered and by a nominal load impedance value close to a characteristic impedance of a transmission medium,
and wherein the OFF power state of the transceiver is characterized by selected or all active components of the transceiver being switched OFF and by a further load impedance value.

9 . A transceiver according to claim 8 , wherein the further load impedance value is different from the nominal load impedance value.

10 . A transceiver according to claim 7 , wherein the detected leaving event is a pre-disconnection message issued or received by the transceiver whereby preliminary steps are to be taken before the communication path is effectively torn down.

11 . An access node comprising a transceiver according to claim 7 .

12 . An access node according to claim 11 , wherein the access node is a Digital Subscriber Line Access Multiplexer DSLAM.

13 . A Customer Premises Equipment CPE comprising a transceiver according to claim 7 .

14 . A CPE according to claim 13 , wherein the CPE is a Digital Subscriber Line DSL gateway.

Assignees

• Alcatel Lucent

Inventors

• Coomans Werner
• Maes Jochen

Classifications

• H04B3/32 Primary

  Reducing cross-talk, e.g. by compensating · CPC title

• H04B3/487

  Testing crosstalk effects · CPC title

• H04M11/062

  using different frequency bands for speech and other data · CPC title

• H04L12/6418

  Hybrid transport · CPC title