Cell based data transmission method

• US 6,728,921 B1
• Filed: 07/21/2000
• Issued: 04/27/2004
• Est. Priority Date: 05/31/1996
• Status: Expired due to Fees

• Current Assignee: Nortel Networks Limited (Nortel Networks Corporation)
• Original Assignee: Nortel Networks Limited (Nortel Networks Corporation)
• Inventors: Bentall, Mark, Turton, Brian Charles Hargrave
• Primary Examiner(s): Baker, Stephen M.
• Application Number:
  US09/620,885
• Time in Patent Office: 1,376 Days
• Field of Search: 714/755, 714/776, 714/758, 714/774
• US Class Current: 714/758
• CPC Class Codes: H04L 1/0057 Block codes H04L1/0061, H04L1/0064 take precedence
• CPC Class Codes: H04L 1/0061 Error detection codes
• CPC Class Codes: H04L 2012/5673 Coding or scrambling
• CPC Class Codes: H04Q 11/0478 Provisions for broadband connections

Abstract

In a cell-based transmission protocol such as ATM, a Cyclic Redundancy Check code is used for error detection at a frame level, and a Hamming code is used for error correction at the cell level, to improve error protection, and reduce the need for retransmission. The method can be used as a modification to ATM Adaption Layers.

Claims

1. An ATM cell-based method of transmitting data from an application, comprising the steps of:

dividing the date across two or more of the cells;

incorporating in a payload of each of the cells, error correction information for correcting the divide data in each of the cells individually depending on the application;

transmitting the cells to a destination;

performing error detection and correction on the divided data in each cell individually;

recombining the corrected divided data; and

detecting uncorrected errors in the recombined data.

2. Apparatus for a transmitting side of a cell-based system for transmitting date for an application, comprising:

means for supplementing the data with error detection information;

means for dividing the supplemented data across to or more of the ATM cells;

means for incorporating within a payload of each cell error correction information; and

means for transmitting the cells.

3. Apparatus for a receiving side of an ATM cell-based system for transmitting data comprising:

means for cells each comprising a portion of the data and comprising error correction information in a payload of the cells;

means for correcting errors in the received cells individually dependent on the application using the error correction information;

means for combining the portions of the data contained in the corrected cells;

means for detecting errors in the recombined data; and

means for processing the errors detected in the recombined data.

4. Software stored on a computer readable medium for carrying out the steps of:

receiving data transmitted in an ATM cell-based form from an application, the data being divided across two or more of the ATM cells, the cells incorporating in a payload of each of the cells error correction information for correcting the divided data in each of the cells individually depending on the application;

performing error detection and correction on the divided data in each cell individually, the correction being dependent on the application;

recombining the corrected divided data; and

detecting uncorrected errors in the recombined data.

5. Apparatus for a receiving side of an ATM cell-based system for transmitting data from an application, the apparatus comprising:

circuitry for receiving ATM cells each comprising a portion of the data and comprising error correction information in a payload of the cells;

circuitry for correcting errors in the received cells individually, dependent on the application, using the error correction information;

circuitry for combining the portions of the data contained in the corrected cells;

circuitry for detecting errors in the recombined data; and

circuitry for processing the errors detected in the recombined data.