Validated signal resumption in DSL systems

• US 20100278222A1
• Filed: 05/02/2009
• Published: 11/04/2010
• Est. Priority Date: 05/02/2009
• Status: Active Grant

• Current Assignee: RPX Corporation
• Original Assignee: Alcatel-Lucent SA (Nokia Corporation)
• Inventors: Van Bruysell, Danny, Nuzman, Carl Jeremy, Maes, Jochen, De Lind Van Wijngaarden, Adriaan J.
• Granted Patent: US 8,433,056 B2
• Time in Patent Office: Days
• US Class Current: 375/220
• CPC Class Codes: H04B 3/32 Reducing cross-talk, e.g. by compensating
• CPC Class Codes: H04M 11/062 using different frequency bands for speech and other data

Abstract

An apparatus includes a DSL transceiver configured to transit to a DSL wait state in which a power transmitted from the DSL transceiver to a local-end line is substantially reduced in response to an interruption or substantial stop at the DSL transceiver of reception of DSL communications from the local-end line. The DSL transceiver is configured to transmit to the local-end line a DSL acknowledge signal in response to receiving from the local-end line a DSL wait signal. The DSL transceiver is configured to resume to transmit DSL communications to the local-end line at a power substantially higher than the power transmitted thereto in the DSL wait state in response either to receiving from the local-end line DSL transmissions at a substantially higher power than received there from in the DSL wait state or to receiving from the local-end line a second DSL acknowledge signal.

Claims

1. A method, comprising:

transiting a first DSL transceiver from a DSL communication session to a DSL wait state in which the first DSL transceiver transmits substantially lower power to a local-end line in response to an interruption or a substantial stop in the DSL communication session of DSL communications in one direction between the first DSL transceiver and a second DSL transceiver;

transmitting a first DSL acknowledge signal from the first DSL transceiver to the local-end line in response to receiving a DSL wait signal at the first DSL transceiver from the local-end line; and

in response to the transmitting, resuming to transmit DSL communications from the first DSL transceiver to the local-end line at a power substantially higher than a power transmitted to the local-end line in the DSL wait state, the act of resuming being responsive either to receiving at the first DSL transceiver a substantially higher DSL power than a DSL power received thereat in the DSL wait state or to receiving at the first DSL transceiver a second DSL acknowledge signal from the second DSL transceiver.

2. The method of claim 1, wherein the act of transiting includes transmitting a DSL wait signal from the first DSL transceiver to the local-end line.

3. The method of claim 1, wherein the method comprises receiving a DSL acknowledge signal from the second DSL transceiver at the first DSL transceiver.

4. The method of claim 1, wherein the interruption or substantial stop includes receiving from the local-end line at the first transceiver a time-averaged DSL power that is reduced by 6 dB or more relative to a time-averaged DSL power received from the local-end line at the first transceiver during an active state immediately prior to the interruption or substantial stop.

5. The method of claim 1, wherein the time-averaged DSL power transmitted by the first transceiver to the local-end line between the act of transiting and the act of resuming is reduced by 6 dB or more with respect to a time-averaged DSL power transmitted to the local-end line by the first transceiver during a DSL active state just prior to the DSL wait state.

6. The method of claim 1, wherein the act of resuming to transmit DSL communications includes precoding data transmissions of a set of centrally controlled DSL transceivers including the first DSL transceiver, the precoding using a precoding matrix used to precode DSL data signals for transmission by the set just prior to the time of the interruption or substantial stop.

7. The method of claim 1, wherein the first DSL transceiver transmits DSL power to the local-end line between the act of transiting and the act of resuming over less than a third of a set of DSL tones used by the first DSL transceiver to transmit DSL communications thereto during a DSL active state just prior to the DSL wait state.

8. The method of claim 1, wherein the act of resuming includes decoding DSL data communications received by a set of centrally controlled DSL transceivers including the first DSL transceiver, the decoding using a decoding matrix used to decode DSL data signals received by the set just prior to a time of the interruption or substantial stop.

9. A method, comprising:

transiting a first DSL transceiver to a DSL wait state in which the first DSL transceiver transmits a substantially lower power to a local-end line in response to an interruption or a substantial stop of DSL communications in one direction between the first DSL transceiver and a second DSL transceiver, the first DSL transceiver transmitting a DSL wait signal to the local-end line in the DSL wait state; and

resuming to transmit DSL communications from the first DSL transceiver to the local-end line at a power substantially higher than a power transmitted from the first DSL transceiver to the local-end line in the DSL wait state or transmitting a second DSL acknowledge signal from the first DSL transceiver to the local-end line; and

wherein the act of resuming to transmit DSL communications or transmitting a second DSL acknowledge signal is responsive to receiving at the first DSL transceiver a first DSL acknowledge signal from the local-end line in response to the DSL wait signal.

10. The method of claim 9, wherein in response to the receiving at the first DSL transceiver a first DSL acknowledge signal from the local-end line, the first DSL transceiver transmits a second DSL acknowledge signal to the local-end line.

11. The method of claim 9, wherein the transiting includes reducing a time-averaged DSL power transmitted from the first DSL transceiver to the local-end line by 6 dB or more relative to a time-averaged DSL power transmitted thereto by the first DSL transceiver during the DSL communication session in which DSL communications were interrupted or substantially stopped.

12. The method of claim 9, wherein the first DSL transceiver transmits the DSL wait signal to the local-end line over less than a third of DSL tones used by the first DSL transceiver to transmit DSL data communications during the DSL communication session in which DSL communications were interrupted or substantially stopped.

13. An apparatus, comprising:

a DSL transceiver configured to perform acts of;

transiting to a DSL wait state in which a power transmitted from the DSL transceiver to a local-end line is substantially reduced in response to an interruption or substantial stop at the DSL transceiver of reception of DSL communications from the local-end line;

transmitting to the local-end line a DSL acknowledge signal in response to receiving from the local-end line a DSL wait signal; and

resuming to transmit DSL communications to the local-end line at a power substantially higher than the power transmitted thereto in the DSL wait state in response either to receiving from the local-end line DSL transmissions at a substantially higher power than received there from in the DSL wait state or to receiving from the local-end line a second DSL acknowledge signal.

14. The apparatus of claim 13, wherein the apparatus comprises a set of centrally controlled DSL transceivers including the first DSL transceiver;

and

wherein the set of the centrally controlled DSL transceivers is configured to precode parallel DSL data transmissions with a matrix when the first DSL transceiver performs the act of resuming, the matrix being used to precode parallel data transmissions near and prior to the interruption or substantial stop.

15. The apparatus of claim 13, wherein the apparatus comprises a set of centrally controlled DSL transceivers including the first DSL transceiver;

and

wherein the set of the centrally controlled DSL transceivers is configured to decode parallel received DSL data communications with a matrix when the first DSL transceiver performs the act of resuming, the matrix being used to decode received DSL data communications near and prior to the interruption or substantial stop.

16. The apparatus of claim 13, wherein the DSL transceiver is configured to transmit to the local-end line a DSL wait signal during the DSL wait state.

17. An apparatus, comprising:

a DSL transceiver configured to;

transit to a DSL wait state in which a power transmitted from the DSL transceiver to a local-end line is substantially reduced in response to an interruption or substantial stop at the DSL transceiver of reception of DSL communications from the local-end line, the DSL transceiver being configured to transmit to the local-end line a DSL wait signal in the DSL wait state, and

resume to transmit DSL communications to the local-end line at a power substantially higher than a power transmitted by the DSL transceiver thereto in the DSL wait state in response to receiving a DSL acknowledge signal from the local-end line in response to transmitting the wait signal thereto.

18. The apparatus of claim 17, wherein the DSL transceiver is configured to transit by reducing a time-averaged DSL power transmitted there from to the local-end line by 6 dB or more relative to a time-averaged DSL power transmitted thereto by the DSL transceiver during the resuming to transmit DSL communications from the DSL transceiver to the local-end line.

19. The apparatus of claim 17, wherein the DSL transceiver is configured to transmit the DSL wait signal to the local-end line over less than a third of a set of DSL tones used by the DSL during the resuming to transmit DSL communications from the DSL transceiver to the local-end line.

20. The apparatus of claim 17, further comprising a set of centrally controlled DSL transceivers including the DSL transceiver configured to perform the act of resuming;

and

wherein, when the DSL transceiver performs the act of resuming, the set of the centrally controlled DSL transceivers is configured to precode parallel DSL data transmissions with a preceding matrix used to precode parallel DSL data transmissions just prior to the interruption or substantial stop and/or to decode parallel received DSL data communications with a decoding matrix used to decode received parallel DSL data communications just prior to the interruption or substantial stop.