RTP Control Protocol (RTCP) Extended Report (XR) Block for Discard Count Metric Reporting

Abstract

This document defines an RTP Control Protocol (RTCP) Extended Report (XR) block that allows the reporting of a simple discard count metric for use in a range of RTP applications.

RTP Control Protocol (RTCP) Extended Report (XR) Block for Independent Reporting of Burst/Gap Discard Metrics

“…The metric "cumulative number of packets lost" defined in [RFC3550] reports a count of packets lost from the media stream (single synchronization source (SSRC) within a single RTP session). Similarly, the metric "number of packets discarded" defined in [RFC7002] reports a count of packets discarded from the media stream (single SSRC within a single RTP session) arriving at the receiver. Another metric, defined in [RFC5725], is available to report on packets that are not recovered by any repair techniques that are in use.…”

“…Another metric, defined in [RFC5725], is available to report on packets that are not recovered by any repair techniques that are in use. Note that the term "discard" defined here builds on the "discard" definition in [RFC3611] but extends the concept to take into account packet duplication and reports different types of discard counts [RFC7002].…”

“…The total number of packets discarded during discard bursts, as defined in Section 3.2 of [RFC7002].…”

“…Discard Count: 32 bits Number of packets discarded over the period (Interval or Cumulative) covered by this report, as defined in Section 3.2 of [RFC7002].…”

RTP Control Protocol (RTCP) Extended Report (XR) for RLE of Discarded Packets

“…o Reporting the number of discarded packets in a measurement interval, i.e., either during the last reporting interval or since the beginning of the session, as indicated by a flag in the suggested XR [RFC7002]. If an endpoint needs to report packet discard due to reasons other than early and late arrival (for example, discard due to duplication, redundancy, etc.…”