Method for communicating data in xDSL using data retransmission

• US 8,219,589 B2
• Filed: 06/24/2011
• Issued: 07/10/2012
• Est. Priority Date: 09/13/2006
• Status: Active Grant

• Current Assignee: Avago Technologies International Sales Pte Limited (Broadcom, Inc.)
• Original Assignee: Broadcom Corporation (Broadcom, Inc.)
• Inventors: Christiaens, Benoit, Peeters, Miguel, Cassiers, Raphael
• Primary Examiner(s): Woo, Isaac M
• Application Number:
  US13/168,468
• Publication Number:
  US 20110314350A1
• Time in Patent Office: 382 Days
• Field of Search: 707631-861, 370464-546, 709230-244
• US Class Current: 707/791
• CPC Class Codes: G06F 1/10 Distribution of clock signals , e.g. skew
• CPC Class Codes: G06F 1/12 Synchronisation of different clock signals provided by a plurality of clock generators
• CPC Class Codes: G06F 16/00 Information retrieval; Database structures therefor; File system structures therefor
• CPC Class Codes: H04L 1/0071 Use of interleaving interleaving per se H03M13/27
• CPC Class Codes: H04L 1/1607 Details of the supervisory signal
• CPC Class Codes: H04L 1/188 Time-out mechanisms

Abstract

In one embodiment, a method for communicating data is provided. The method includes, defining a data transmission unit (DTU) to be sent in an xDSL data stream, defining a retransmit container as a time slot that corresponds to the DTU, maintaining a copy of the DTU and an index corresponding to the retransmit container in a retransmission buffer, transmitting the DTU in the xDSL data stream, determining whether the DTU should be retransmitted, and if the DTU should be retransmitted: identifying the DTU by the retransmit container and retransmitting a copy of the DTU as identified by the retransmit container before the DTU leaves the retransmission buffer.

Claims

1. A method for communicating data between a first device and a second device, comprising:

defining a data transmission unit (DTU) to be sent in an xDSL data stream;

defining a retransmit container as a time slot that corresponds to the DTU;

maintaining a copy of the DTU and an index corresponding to the retransmit container in a retransmission buffer, wherein the retransmit container is maintained at the second device independently of the first device;

transmitting the DTU in the xDSL data stream;

determining whether the DTU should be retransmitted; and

if the DTU should be retransmitted;

identifying the DTU by the retransmit container; and

retransmitting a copy of the DTU as identified by the retransmit container before the DTU leaves the retransmission buffer.

2. The method of claim 1, further comprising:

identifying the DTU using a sequence identification (SID) associated with the DTU, wherein the DTU is identified in the retransmission signal by the SID.

3. The method of claim 1, wherein maintaining comprises:

maintaining the copy of the DTU for a period of time sufficient to determine whether the DTU should be retransmitted.

4. The method of claim 1, wherein defining comprises:

defining the DTU as a group of n consecutive code words wherein n=1/S code words and S is an integer.

5. The method of claim 1, wherein defining comprises:

defining the DTU as one of a group of D Reed Solomon code words, a block of asynchronous transfer mode (ATM) cells, or packet transfer mode (PTM) code words.

6. The method of claim 1, wherein defining comprises:

defining the DTU as the set of L bits mapped on a discrete multi-tone (DMT) symbol.

7. The method of claim 2, wherein defining comprise:

defining the DTU as including an overhead byte that supports the SID, the overhead byte being an 8-bit wrap-around counter that increments each time a new DTU is defined.

8. The method of claim 1, wherein determining step comprises:

receiving a retransmission request indicating that the DTU was corrupted and requesting retransmission of an uncorrupted copy of the DTU, wherein the DTU is identified in the retransmission request by its corresponding retransmit container.

9. The method of claim 8, further comprising:

receiving the retransmission request in a first direction over a retransmit control channel.

10. The method of claim 1, further comprising determining that sufficient bandwidth is available for retransmission.

11. The method of claim 1, wherein determining comprises extracting a pattern from a plurality of received retransmit requests.

12. The method of claim 1, wherein determining comprises:

determining whether an acknowledgement has been received for the DTU.

13. The method of claim 1, wherein determining comprises:

identifying a pattern associated with noise that can corrupt the DTU during transmission.

14. The method of claim 1, wherein the retransmission is deferred until the DTU is at a predefined position in the retransmission buffer.

16. The method of claim 10, wherein the determining that sufficient bandwidth is available step comprises determining a number of consecutive retransmissions.

17. The method of claim 10, wherein the determining that sufficient bandwidth is available step further comprises determining a number of retransmissions in a time period.

15. A method for communicating data, comprising:

defining a data transmission unit (DTU) to be sent in an xDSL data stream;

defining a retransmit container as a time slot that corresponds to the DTU;

maintaining a copy of the DTU and an index corresponding to the retransmit container in a retransmission buffer;

transmitting the DTU in the xDSL data stream;

determining whether the DTU should be retransmitted, comprising;

determining whether an acknowledgement was received for the DTU; and

if an acknowledgement was not received for the DTU, generating a retransmission request identifying the DTU by the retransmit container; and

if the DTU should be retransmitted;

identifying the DTU by the retransmit container; and

retransmitting a copy of the DTU as identified by the retransmit container before the DTU leaves the retransmission buffer.