Method and apparatus for enhanced error correction
| Title: | Method and apparatus for enhanced error correction |
|---|---|
| Patent Number: | 8,612,822 |
| Publication Date: | December 17, 2013 |
| Appl. No: | 12/985978 |
| Application Filed: | January 06, 2011 |
| Abstract: | A data unit is received, wherein the data unit includes a primary information data structure and a primary redundancy data structure. A field in the primary information data structure is detected. A secondary error correction operation is performed on the detected field. After performing the secondary error correction operation, a primary error correction operation is performed on the data unit using the primary redundancy data structure. |
| Inventors: | Izenberg, Erez (Tel Aviv, IL); Shafrir, Oren (Tel Aviv, IL); Amit, Erez (Rehovot, IL); Melts, Dimitry (Tel Aviv, IL) |
| Assignees: | Marvell Israel (M.I.S.L.) Ltd. (Yokneam, IL) |
| Claim: | 1. A method, comprising: a) receiving a data unit comprising a primary information data structure and a primary redundancy data structure; b) detecting one or more fields in the primary information data structure; c) performing a respective secondary error correction operation on each of at least one of the detected one or more fields; and d) after act c), performing a primary error correction operation on the data unit using the primary redundancy data structure. |
| Claim: | 2. A method according to claim 1 , wherein act b) comprises detecting a field associated with a secondary redundancy data structure; and wherein act c) comprises utilizing the secondary redundancy data structure to perform a secondary error correction operation on the field associated with the secondary redundancy data structure. |
| Claim: | 3. A method according to claim 2 , wherein detecting the field associated with the secondary redundancy data structure comprises detecting a field of a header; and wherein utilizing the secondary redundancy data structure to perform the secondary error correction operation on the field of the header comprises utilizing a cyclic redundancy check (CRC) field of the header. |
| Claim: | 4. A method according to claim 1 , wherein act b) comprises detecting a first field in the primary information data structure of the received data unit, wherein the first field was set to a known value by a transmitter device; and wherein act c) comprises overriding the first field with the known value. |
| Claim: | 5. A method according to claim 4 , further comprising determining whether the first field is in error; and wherein overriding the first field with the known value is performed when it is determined that the first field is in error. |
| Claim: | 6. A method according to claim 4 , wherein detecting the first field comprises detecting a field of a header that was set to the known value by the transmitter device. |
| Claim: | 7. A method according to claim 4 , wherein detecting the first field comprises detecting a payload that was set to the known value by the transmitter device. |
| Claim: | 8. A method according to claim 1 , wherein receiving the data unit comprises receiving a block code codeword; and wherein performing the primary error correction operation on the data unit comprises performing a block code decoder operation on the codeword. |
| Claim: | 9. An apparatus, comprising: a processing unit configured to process data units received via a network, wherein each data unit comprises a primary information data structure and a primary redundancy data structure; wherein the processing unit is configured to detect one or more fields in the primary information data structure; wherein the processing unit includes: a secondary error correction unit to perform a respective secondary error correction operation on each of at least one of the one or more fields detected in the primary information data structure, and a primary error correction unit to perform a primary error correction operation on the data unit using the primary redundancy data structure after the secondary error correction unit performs the respective secondary error correction operation on each of the at least one of the one or more detected fields. |
| Claim: | 10. An apparatus according to claim 9 , wherein the processing unit is configured to detect, in the primary information data structure, a field associated with a secondary redundancy data structure; and wherein the secondary error correction unit is configured to utilize the secondary redundancy data structure to perform the secondary error correction operation on the field associated with the secondary redundancy data structure. |
| Claim: | 11. An apparatus according to claim 10 , wherein the processing unit is configured to detect, in the primary information data structure, a field of a header having a cyclic redundancy check (CRC) subfield; and wherein the secondary error correction unit comprises a CRC decoder configured to perform CRC decoding on the field of the header using the CRC subfield. |
| Claim: | 12. An apparatus according to claim 9 , wherein the processing unit is configured to detect, in the primary information data structure, a field that was set to a known value by a transmitter device; and wherein the secondary error correction unit is configured to override the first field with the known value. |
| Claim: | 13. An apparatus according to claim 12 , wherein the secondary error correction unit is configured to: determine whether the first field is in error, and override the first field when it is determined that the first field is in error. |
| Claim: | 14. An apparatus according to claim 12 , wherein the secondary error correction unit is configured to override a value of a field of a header in the primary information data structure, wherein the field of the header was set to the known value by the transmitter device. |
| Claim: | 15. An apparatus according to claim 12 , wherein the secondary error correction unit is configured to override a value of a payload in the primary information data structure, wherein the payload was set to the known value by the transmitter device. |
| Claim: | 16. An apparatus according to claim 9 , wherein the data unit is a block code codeword; and wherein the primary error correction unit comprises a block code decoder to decode the data unit using the primary redundancy data structure. |
| Claim: | 17. An apparatus according to claim 9 , wherein the secondary error correction unit is configured to detect the one or more fields in the primary information data structure. |
| Claim: | 18. An apparatus, comprising: a processing unit configured to process block code forward error correction (FEC) encoded data units received via a network, wherein each data unit comprises a primary information data structure and a primary redundancy data structure; wherein the processing unit is configured to detect a field in the primary information data structure; wherein the processing unit includes: a secondary error correction unit to correct an error in the detected field, and a primary error correction unit to perform a primary error correction operation on the data unit using the primary redundancy data structure after the secondary error correction unit corrects the error in the detected field. |
| Claim: | 19. An apparatus according to claim 18 , wherein the secondary error correction unit is configured to perform a secondary error correction operation on the field using a secondary redundancy data structure in the data unit and associated with the field. |
| Claim: | 20. An apparatus according to claim 18 , wherein the secondary error correction unit is configured to set the field to a known value. |
| Current U.S. Class: | 714/755 |
| Patent References Cited: | 7043162 May 2006 Kubo et al. 7111221 September 2006 Birru et al. 7934244 April 2011 Kim et al. 7992068 August 2011 Chen et al. 8145979 March 2012 Song et al. 2009/0263130 October 2009 Luo et al. 2011/0164877 July 2011 Li et al. 2012/0045207 February 2012 Luo et al. 2012/0069892 March 2012 Kim et al. 2012/0084621 April 2012 Hong et al. |
| Other References: | ITU-T Recommendation G.984.1, “Gigabit-capable Passive Optical Networks (GPON): General characteristics,” International Telecommunication Union, Mar. 2003, 22 pages. cited by applicant ITU-T Recommendation G.984.2, “Gigabit-capable Passive Optical Networks (GPON): Physical Media Dependent (PMD) layer specification,” International Telecommunication Union, Mar. 2003, 38 pages. cited by applicant ITU-T Recommendation G.984.2 (2003)—Amendment 1, “Gigabit-capable Passive Optical Networks (GPON): Physical Media Dependent (PMD) layer specification, Amendment 1: New Appendix III—Industry best practice for 2.488 Gbit/s downstream, 1.244 Gbit/s upstream G-Pon,” International Telecommunication Union, Feb. 2006, 12 pages. cited by applicant ITU-T G.984.3 Implementers' Guide, “Implementers' Guide for ITU-T Rec. G.984.3 (Feb. 2004),” International Telecommunication Union, Feb. 17, 2006, 20 pages. cited by applicant ITU-T Recommendation G.984.3 (2004)—Amendment 1, “Gigabit-capable Passive Optical Networks (GPON): Transmission convergence layer specification, Amendment 1,” International Telecommunication Union, Jul. 2005, 46 pages. cited by applicant ITU-T Recommendation G.984.3 (2004)—Amendment 2, “Gigabit-capable Passive Optical Networks (GPON): Transmission convergence layer specification, Amendment 2,” International Telecommunication Union, Mar. 2006, 14 pages. cited by applicant ITU-T Recommendation G.984.3 (2004)—Amendment 3, “Gigabit-capable Passive Optical Networks (GPON): Transmission convergence layer specification, Amendment 3,” International Telecommunication Union, Dec. 2006, 12 pages. cited by applicant ITU-T Recommendation G.984.3 (Mar. 2008), “Gigabit-capable Passive Optical Networks (GPON): Transmission convergence layer specification,” International Telecommunication Union, Mar. 2008, 146 pages. cited by applicant ITU-T Recommendation G.984.3 (2008)—Amendment 1, “Gigabit-capable Passive Optical Networks (GPON): Transmission convergence layer specification, Amendment 1—Specification of the ONU registration method and various clarifications,” International Telecommunication Union, Feb. 2009, 16 pages. cited by applicant ITU-T Recommendation G.984.3 (2008)—Amendment 2, “Gigabit-capable Passive Optical Networks (GPON): Transmission convergence layer specification, Amendment 2—Time-of-day distribution and maintenance updates and clarifications,” International Telecommunication Union, Nov. 2009, 18 pages. cited by applicant ITU-T Recommendation G.984.3 (2008)—Amendment 3, “Gigabit-capable Passive Optical Networks (GPON): Transmission convergence layer specification, Amendment 3,” International Telecommunication Union, Apr. 2012, 18 pages. cited by applicant |
| Primary Examiner: | Merant, Guerrier |
| Accession Number: | edspgr.08612822 |
| Database: | USPTO Patent Grants |
| Language: | English |
|---|