Reed-Solomon Forward Error Correction (FEC) Schemes
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From: The IESG <email@example.com> To: IETF-Announce <firstname.lastname@example.org> Cc: Internet Architecture Board <email@example.com>, RFC Editor <firstname.lastname@example.org>, rmt mailing list <email@example.com>, rmt chair <firstname.lastname@example.org> Subject: Protocol Action: 'Reed-Solomon Forward Error Correction (FEC) Schemes' to Proposed Standard The IESG has approved the following document: - 'Reed-Solomon Forward Error Correction (FEC) Schemes ' <draft-ietf-rmt-bb-fec-rs-05.txt> as a Proposed Standard This document is the product of the Reliable Multicast Transport Working Group. The IESG contact persons are Magnus Westerlund and Lars Eggert. A URL of this Internet-Draft is: http://www.ietf.org/internet-drafts/draft-ietf-rmt-bb-fec-rs-05.txt
Technical Summary This document is an optional Building Block usable to fully define an RMT Protocol. It fully-specifies Forward Error Correction (FEC) Codes based on the well-known Reed-Solomon algorithm for application in the packet erasure channel as consistent with RMT Protocol needs. This is done within the guidelines of draft-ietf-rmt-fec-bb-revised. It also specifies procedures and packet-header fields, as required by draft-ietf-rmt-fec-bb-revised. The combination of this document and draft-ietf-rmt-fec-bb-revised allows the implementation of an interoperable Forward Error Correction scheme usable in the context of an RMT transport protocol (e.g. LCT/ALC or NORM). The Reed-Solomon code specified is a systematic code. Parity symbols are generated using Galois field mathmatics. A range of block sizes with varying computational complexity are covered with codes with individual symbol sizes from 2^^8..2^^16 described. Reed-Solomon codes belong to the class of Maximum Distance Separable symbols from any set of k received symbols. This idealized property allows adaptation to maximumally-efficient repair strategies for RMT protocol like NORM that use FEC-based repair. Working Group Summary There is consensus in the WG to publish these documents. Document Quality A very mature working, open source implementation of the FEC algorithms this document describes is available. The FEC implementation has been used in working RMT NORM implementations. The Reed-Solomon technique described has been successfully used in reliable multicast transport for over 10 years. Brian Adamson is the Document Shepherd. Magnus Westerlund is the Responsible Area Director. Note to RFC Editor Section 9.2.2 OLD: o at the packet level, each packet can be digitally signed. A major limitation is the high computational and transmission overheads that this solution requires (unless Elliptic Curve Cryptography (ECC) is used, but ECC is the subject of proprietary patents). NEW: o at the packet level, each packet can be digitally signed. A major limitation is the high computational and transmission overheads that this solution requires (unless Elliptic Curve Cryptography (ECC) is used).