The IESG has approved the following document: - 'RaptorQ Forward Error Correction Scheme for Object Delivery' (draft-ietf-rmt-bb-fec-raptorq-06.txt) as a Proposed Standard This document is the product of the Reliable Multicast Transport Working Group. The IESG contact persons are David Harrington and Wesley Eddy. A URL of this Internet Draft is: http://datatracker.ietf.org/doc/draft-ietf-rmt-bb-fec-raptorq/ Technical Summary This document is an optional Building Block usable to fully define an RMT Transport Protocol. It fully-specifies a Forward Error Correction Code, called "RaptorQ", within the guidelines of RFC 5052. It also specifies procedures and packet-header fields, as required by RFC 5052. The combination of this document and RFC 5052 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). RaptorQ is a fountain code, i.e., as many encoding symbols as needed can be generated by the encoder on-the-fly from the source symbols of a source block of data. The decoder is able to recover the source block from any set of encoding symbols only generally equal to or occasionally with slightly more in number than the number of source symbols. The RaptorQ code described here is a systematic code, meaning that all the source symbols are among the encoding symbols that can be generated Working Group Summary There is consensus in the WG to publish these documents. As a result of the IESG questions and discussions, a further revised IPR statement was filed by Qualcomm Incorporated. See the following link: https://datatracker.ietf.org/ipr/1553/ Because of this updated IPR disclosure, an additional RMT Working Group Last Call was conducted. The only resultant working group email discussion to the revised IPR was that it was an improvement in that it more clearly covered unicast as well as multicast use cases of the technology. The following URL points to the mailing list archive message thread regarding this additional WGLC: http://www.ietf.org/mail-archive/web/rmt/current/msg01547.html It is important to note, as had been described in the earlier publication writeup for this specification that, although IPR is in place, this forward error correction technique is just one of several types that the RMT WG has specified and other, unencumbered techniques have been defined. Thus, the RMT WG had previously discussed this matter concluding that it wished to publish this document regardless of the IPR since this new FEC code is one of multiple alternatives that can be used to implement the RMT higher-level protocols, as such the possible IPR covering this does not preclude the unencumbered implementation of the RMT Protocols. The IPR licensing terms presented by Qualcomm appear to be reasonable. Document Quality Are there existing implementations of the protocol? Have a significant number of vendors indicated their plan to implement the specification? Are there any reviewers that merit special mention as having done a thorough review, e.g., one that resulted in important changes or a conclusion that the document had no substantive issues? If there was a MIB Doctor, Media Type, or other Expert Review, what was its course (briefly)? In the case of a Media Type Review, on what date was the request posted? The document is similar in content to the prior "Raptor" codec of RFC 5053 and benefits from the development and reviews of that specification. Additionally, an independent implementation was conducted from the version 03 draft and only minor suggestions were made (and were incorporated) by that developer to clarify the document. Personnel Document Shepherd: Brian Adamson (adamson@itd.nrl.navy.mil) Responsible Area Director: David Harrington _______________________________________________ IETF-Announce mailing list IETF-Announce@ietf.org https://www.ietf.org/mailman/listinfo/ietf-announce
