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Metrics for Discarded Packets in Real-Time Communication Protocols

This document discusses proposed discard metrics for assessing discarded packets in real-time communication scenarios, specifically under MPRTP conditions. When packets exceed a specific time budget, the receiver may discard them due to RTT mismatches across paths, affecting data delivery. The sender seeks insights about the discarded packets' sizes and counts. The metrics include XR.discard.bytes for monitoring discarded byte counts and XR.discard.RLE for signaling which packets were discarded. The document suggests further discussions regarding enhancements and next steps for working groups.

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Metrics for Discarded Packets in Real-Time Communication Protocols

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  1. draft-ott-xrblock-rtcp-xt-discard-metrics-01 JoergOtt, Varun Singh

  2. Discard Metrics • Original draft proposed: December 2008 • Applicability: • If packets don’t arrive in a certain time budget the receiver may discarded these packets. • Due to RTT mismatch in MPRTP the receiver will discard packets from one of the path (depending on the playout delay). • The sender wants to know which ones, or what was the cumulative size of the packets, or how many.

  3. XR Discard Metrics • 2 Message blocks: • XR discard bytes • Number of bytes discarded since the interval • XR discard RLE • Run length encoded to signal which packets got discarded • Early bit: E=1 if discarded due to early arrival, 0 otherwise • Interval bit: I=1 if an interval metric, 0 when cumulative. • Some discussion on the list about changing this to 2 bits?

  4. Next Steps • Finally: WG item followed by WG LC.

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