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Begen Standards Track [Page 14] RFC 6364 SDP Elements for FEC Framework October 2011 v=0 o=ali 1122334455 1122334466 IN IP4 s=FEC Framework Examples t=0 0 a=group:FEC-FR S6 R5 a=group:FEC-FR S6 Otherwise, the 'tag-len' parameter MUST NOT exist. 4.5. Attacks can target the content, the CDP, or the network itself, with completely different consequences, particularly in terms of the number of impacted nodes. A single SAP (announcement) message must carry the FEC Framework Configuration Information for a single FEC Framework instance.

In both containers, FSSI is transmitted in the form of textual representation and MAY contain multiple distinct elements. Some of these terms and definitions are FEC scheme specific and are in line with [RFC5052]: Source symbol: unit of data used during the encoding process. Standards Track [Page 6] RFC 6865 Simple Reed-Solomon FEC Scheme February 2013 FEC Source Packet: At a sender (respectively, at a receiver) a payload submitted to (respectively, received from) the transport Content Delivery Protocols defined using this framework can support any FEC scheme (and associated FEC codes) that is compliant with various requirements defined in this document.

Such FEC schemes could obviously only be used with CDPs which provided the appropriate information from which the FEC Payload ID could be derived. Additionally, the post-repair RTCP extended reports [RFC5725] may be used to obtain information about the loss rate after FEC recovery. This information may also include FEC scheme-specific parameters for the FEC decoder. 2. With systematic codes, source symbols are part of the encoding symbols.

The field type is unsigned integer. The encoding format of the FEC Payload ID, including its size, is defined by the FEC Scheme. The tuple MUST identify a single scheme instance that has at least one implementation. Several dimensions to the problem need to be considered.

Repair Packet Construction .........................14 7.4. Code Components extracted from this document must include Simplified BSD License text as described in Section 4.e of the Trust Legal Provisions and are provided without warranty as described in the Watson, et al. This document defines the way that the Explicit Source FEC Payload ID field is appended to source packets to form FEC source packets.

Status of This Memo This is an Internet Standards Track document. The FEC scheme determines whether the Explicit Source FEC Payload ID field is required. o The sender packetizes the repair symbols and sends the repair packet(s) and the source packets to the receiver(s). The field type is unsigned integer.

FEC Source Packet: At a sender (respectively, at a receiver), a payload submitted to (respectively, received from) the transport protocol containing an ADU along with an optional Explicit Source FEC Payload Other consequences, that are use case and/or CDP dependent, may also happen. We acknowledge that there are a few exotic applications, e.g., IP traffic from space-based senders, or senders in certain hardened military devices, that could warrant a higher FEC strength. Encoding Symbol ID (ESI), (24 bits): The starting symbol index of the source packet in the source block.

o m parameter (m): 7-bit field. 0 1 2 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 Common Procedures Related to the ADU Block and Source Block Creation This section introduces the procedures that are used during the ADU block and the related source block creation for the Common FEC Object Transmission Information elements can be transported in two different ways: (a) the FEC Scheme defines an encoding format for the Common FEC Object Transmission Information elements that it For example, FLUTE [8] specifies an XML-based encoding format for these elements, but can also transport FEC scheme-specific encoding formats within the EXT-FTI LCT header extension. 6.2.5.

Definitions Notations and Abbreviations . . . . . . . . . . . 5 3.1. CDPs can be designed to operate with a range of different FEC codes/schemes, without needing to know details of the specific FEC code/scheme that may be used. 2. One Source Flow, Two Repair Flows, and Two FEC Schemes ....14 7. o T be the source symbol size in octets.

Normative References .....................................40 13.2. A_small -- the length of each of the smaller source blocks in symbols. Watson, et al. FEC Framework The FEC Framework [RFC6363] outlines a general framework for using FEC codes in multimedia applications that stream audio, video, or other types of multimedia content.

Note that if the original packets of the source flow are already carrying a packet sequence number that is at least two bytes long, there is no need to add the These are rather specified by the individual FEC schemes or CDPs. 3.3. Vicisano, "Asynchronous Layered Coding (ALC) Protocol Instantiation", RFC 5775, April 2010. However, such buffering is CDP- and/or implementation-specific and is not specified here.

FEC Scheme Specifications ......................................14 8. o m parameter (m): an integer that defines the length of the elements in the finite field, in bits. Roca, et al. FEC Framework Configuration Information

Note that this document doesn't define any new signaling protocol; rather, it just provides examples of how existing protocols should be used. When the FEC Framework endpoint is a middlebox, the recovered source flow, after FEC decoding, SHOULD NOT be sent in plaintext to the final destination(s) if the threat model includes the A single instance of the FEC Framework protects packets of the source flows identified in (2) above; i.e., all packets sent on those flows MUST be FEC source packets as defined Introduction 2.

Repair Packet Construction See Section 7.3.2 8.2.4. Introduction This document describes how to use Forward Error Correction (FEC) codes to provide support for reliable delivery of content within the context of a Content Delivery Protocol (CDP). This is to provide a means (e.g., a field such as Payload Type) in the signaling protocol message(s) to convey the chosen encoding format for the configuration information so that the It includes all information of the first class above and may include information of the second class.

FEC Schemes Two types of FEC scheme are defined by this document: 'Fully- Specified' FEC schemes and 'Under-Specified' FEC schemes. Watson, et al. The ESI provided is the ESI of the first repair symbol in the packet. Asati Informational [Page 5] RFC 6695 FEC Framework Config Signaling August 2012 5.

Watson, et al. Output: I -- the number of larger source blocks. The choice of which way the Common FEC Object Transmission Information elements shall be transported, (a) or (b), is made by the Content Delivery Protocol, and a particular method SHOULD be This document defines a framework for the definition of CDPs that provide for FEC protection for arbitrary packet flows over unreliable transports such as UDP.

These identifiers (in the range of [0 - 255]) are registered by the FEC schemes that use the FEC Framework and are maintained by IANA. and H. o In order to prevent such misuse, one approach is to leave standardization to bodies most concerned with the problem described above. In particular, many of them use the Reed-Solomon codec of Luigi Rizzo [RS-codec] [Rizzo97].

FEC schemes designed for use with this framework must fulfill a number of requirements defined in this document.