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To
indicate the position of source packet in a source block.
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To
group source and repair packets into source block.
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The
FEC Framework [I-D.ietf-fecframe-framework] describes a Generic
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Explicit
Source FEC Payload Id to arbitrary packet flows.
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A
FEC-Framework-incompatible client
would fail to understand the source packet
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with
FEC payload ID included.
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Considering
backward compatibility by not changing the source packet
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format,
a possible way to follow is to
transmit the source FEC payload
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IDs
in separate packets.
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This
draft specifies a FEC payload header and a source FEC payload
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mapping
information unit (MIU).
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