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Hitoshi Asaeda ( asaeda@wide.ad.jp ) Rachel Huang ( rachel.huang@ huawei )

RTCP XR Blocks for Synchronization Delay and Offset Metrics Reporting draft-asaeda-xrblock-rtcp-xr-synchronization-02. Hitoshi Asaeda ( asaeda@wide.ad.jp ) Rachel Huang ( rachel.huang@ huawei.com ) Qin Wu ( bill.wu@huawei.com ). Overview. Background

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Hitoshi Asaeda ( asaeda@wide.ad.jp ) Rachel Huang ( rachel.huang@ huawei )

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  1. RTCP XR Blocks for Synchronization Delay and Offset Metrics Reportingdraft-asaeda-xrblock-rtcp-xr-synchronization-02 Hitoshi Asaeda (asaeda@wide.ad.jp ) Rachel Huang (rachel.huang@huawei.com) Qin Wu (bill.wu@huawei.com)

  2. Overview • Background • draft-asaeda-xrblock-rtcp-xr-synchronization-02 is split from draft-wu-avt-rtcp-xr-quality-monitoring right after avt was split. • This draft discusses Synchronization Delay and Offset between RTP streams. • -02 version contains a few changes that follow consensus of monitoring architecture document. • Changes since -00 version • Explain what the components of RTP session are in section 3. • Clarify which synchronization is reported in section 4 and 5. • Allow calculating the synchronization delay based on RTP header extension defined in RFC6051.

  3. Metric Blocks • Synchronization Delay and Offset • Metric name: Initial Synchronization Delay between streams • Measurement method: Initial Synchronization Delay = Arrival time of the first RTCP SR packet − Session join time or Arrival time of the first RTP packet with embedded NTP format timestamp – Session join time • Metric name: General Synchronization Offset between streams • Measurement method: General Synchronization Offset = Difference D(i,j) where i and j denote stream between an arbitrary RTP packet and the reference RTP packet with the same CNAME D(i,j) can be calculated based on the measurement method for interarrival jitter defined in RFC3550

  4. Next Step • Adoption as a work item? • Question?

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