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Versions: (draft-zorn-xrblock-rtcp-xr-al-stat) 00 01 02 03 04 05 06 11 RFC 7004

Network Working Group                                       G. Zorn, Ed.
Internet-Draft                                               Network Zen
Intended status: Standards Track                               R. Schott
Expires: June 17, 2013                                  Deutsche Telekom
                                                                   Q. Wu
                                                                R. Huang
                                                                  Huawei
                                                       December 14, 2012


  RTP Control Protocol (RTCP) Extended Report (XR) Blocks for Summary
                      Statistics Metrics Reporting
               draft-ietf-xrblock-rtcp-xr-summary-stat-04

Abstract

   This document defines three RTP Control Protcol (RTCP) Extended
   Report (XR) Blocks that allow the reporting of loss, duplication and
   discard summary statistics metrics in a range of RTP applications.

Status of this Memo

   This Internet-Draft is submitted in full conformance with the
   provisions of BCP 78 and BCP 79.

   Internet-Drafts are working documents of the Internet Engineering
   Task Force (IETF).  Note that other groups may also distribute
   working documents as Internet-Drafts.  The list of current Internet-
   Drafts is at http://datatracker.ietf.org/drafts/current/.

   Internet-Drafts are draft documents valid for a maximum of six months
   and may be updated, replaced, or obsoleted by other documents at any
   time.  It is inappropriate to use Internet-Drafts as reference
   material or to cite them other than as "work in progress."

   This Internet-Draft will expire on June 17, 2013.

Copyright Notice

   Copyright (c) 2012 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

   This document is subject to BCP 78 and the IETF Trust's Legal
   Provisions Relating to IETF Documents
   (http://trustee.ietf.org/license-info) in effect on the date of
   publication of this document.  Please review these documents
   carefully, as they describe your rights and restrictions with respect
   to this document.  Code Components extracted from this document must



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   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 Simplified BSD License.


Table of Contents

   1.  Introduction . . . . . . . . . . . . . . . . . . . . . . . . .  3
     1.1.  Summary Statistics Metrics . . . . . . . . . . . . . . . .  3
     1.2.  RTCP and RTCP XR Reports . . . . . . . . . . . . . . . . .  3
     1.3.  Performance Metrics Framework  . . . . . . . . . . . . . .  3
     1.4.  Applicability  . . . . . . . . . . . . . . . . . . . . . .  3
   2.  Terminology  . . . . . . . . . . . . . . . . . . . . . . . . .  4
     2.1.  Standards Language . . . . . . . . . . . . . . . . . . . .  4
   3.  Transport Related End System Metrics . . . . . . . . . . . . .  4
     3.1.  Burst/Gap Loss Summary Statistics Metrics Block  . . . . .  4
       3.1.1.  Report Block Structure . . . . . . . . . . . . . . . .  5
       3.1.2.  Definition of Fields in Loss Summary Statistics
               Block  . . . . . . . . . . . . . . . . . . . . . . . .  5
     3.2.  Burst/Gap Discard Summary Statistics Metrics Block . . . .  7
       3.2.1.  Report Block Structure . . . . . . . . . . . . . . . .  7
       3.2.2.  Definition of Fields inBurst/Gap Discard Summary
               Statistics Block . . . . . . . . . . . . . . . . . . .  8
   4.  Application Level Metrics  . . . . . . . . . . . . . . . . . .  9
     4.1.  Frame Impairment Statistics Summary Metrics Block  . . . .  9
       4.1.1.  Report Block Structure . . . . . . . . . . . . . . . . 10
       4.1.2.  Definition of Fields in Frame Impairment Summary
               Statistics Block . . . . . . . . . . . . . . . . . . . 10
   5.  SDP Signaling  . . . . . . . . . . . . . . . . . . . . . . . . 12
     5.1.  SDP rtcp-xr-attrib Attribute Extension . . . . . . . . . . 12
     5.2.  Offer/Answer Usage . . . . . . . . . . . . . . . . . . . . 12
   6.  IANA Considerations  . . . . . . . . . . . . . . . . . . . . . 12
     6.1.  New RTCP XR Block Type values  . . . . . . . . . . . . . . 12
     6.2.  New RTCP XR SDP Parameters . . . . . . . . . . . . . . . . 13
     6.3.  Contact information for registrations  . . . . . . . . . . 13
   7.  Security Considerations  . . . . . . . . . . . . . . . . . . . 13
   8.  Acknowledgements . . . . . . . . . . . . . . . . . . . . . . . 13
   9.  References . . . . . . . . . . . . . . . . . . . . . . . . . . 14
     9.1.  Normative References . . . . . . . . . . . . . . . . . . . 14
     9.2.  Informative References . . . . . . . . . . . . . . . . . . 14
   Appendix A.  Change Log  . . . . . . . . . . . . . . . . . . . . . 14
     A.1.  draft-ietf-xrblock-rtcp-xr-summary-stat-04 . . . . . . . . 15
   Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . . 15








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1.  Introduction

1.1.  Summary Statistics Metrics

   This draft defines three new block types to augment those defined in
   [RFC3611] for use in a range of RTP applications.

   The first two block types support the reporting of burst gap loss/
   discard summary statistics including packet loss/discard proportion,
   mean and variance and belong to the class of transport-related end
   system metrics defined in [RFC6792].  These two blocks are intended
   to be used in conjunction with information from the Burst Gap Loss
   metric block or Burst Gap Discard metric block, and on which these
   two block therefore depend.  The metrics in the Burst Gap Loss block
   or Burst Gap Discard metric block can be used independently of the
   metrics defined in the first two blocks, however.

   The third block supports the reporting of detailed statistics for
   each frame type, including the number of frames received, lost and
   discarded of each frame type in the Group of Pictures (GOP) and
   additional data allowing the calculation of statistical parameters
   (e.g.,the proportion of each frame type impaired by packet loss and
   discard).  The metrics defined in this block belong to the class of
   application layer metrics defined in [RFC6792].

1.2.  RTCP and RTCP XR Reports

   The use of RTCP for reporting is defined in [RFC3550].  [RFC3611]
   defined an extensible structure for reporting using an RTCP Extended
   Report (XR).  This document defines a new Extended Report block for
   use with [RFC3550] and [RFC3611].

1.3.  Performance Metrics Framework

   The RTP Monitoring Architectures [RFC6792] provides guideline for
   reporting block format using RTCP XR.  Metrics described in this
   draft are in accordance with the guidelines in [RFC6792].

1.4.  Applicability

   These metrics are applicable to a wide range of RTP applications and
   reflect transient IP problems that affect user experience.  They can
   be used to form an accurate assessment of users' quality of
   experience and influence sender strategies to mitigate the problem.







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2.  Terminology

2.1.  Standards Language

   The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
   "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this
   document are to be interpreted as described in RFC 2119 [RFC2119].

   In addition, the following terms are defined:

   Picture Type

      Picture Types used in the different video algorithms are composed
      of the Key frame and Derived frames.  The Key frame is also called
      a reference frame and used as a reference for predicting other
      pictures.  It is coded without prediction from other pictures.
      Derived frames are derived from a Key frame using a prediction
      algorithm.



3.  Transport Related End System Metrics

3.1.  Burst/Gap Loss Summary Statistics Metrics Block

   The metrics described here are intended to be used as described in
   this section, in conjunction with information from the Measurement
   Information block [RFC6776] (which MUST be present in the same RTCP
   packet as the Burst/Gap Loss block) and also with the metric
   "cumulative number of packets lost" provided in standard RTCP
   [RFC3550].  Instances of this Metrics Block refer by Synchronization
   source (SSRC) to the separate auxiliary Measurement Information block
   [RFC6776] which contains measurement periods (see [RFC6776] section
   4.2).  This metrics block relies on the measurement period in the
   Measurement Information block indicating the span of the report and
   SHOULD be sent in the same compound RTCP packet as the measurement
   information block.  If the measurement period is not received in the
   same compound RTCP packet as this metric block, this metrics block
   MUST be discarded.

   The metrics carried in this metrics block provide information
   relevant to statistical parameters, including burst loss rate, gap
   loss rate, burst duration mean, burst duration variance and are
   calculated at the receiving end of the RTP stream using burst gap
   loss metrics defined in [BGLOSS] and other information which is sent
   together with this report block.





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3.1.1.  Report Block Structure

       0                   1                   2                   3
       0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |    BT=BGLSS   | I | Reserved  |        block length           |
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |                         SSRC of Source                        |
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |        Burst Loss Rate        |         Gap Loss Rate         |
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |       Burst duration Mean     |    Burst duration Variance    |
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

3.1.2.  Definition of Fields in Loss Summary Statistics Block

   Block Type (BT): 8 bits

      Burst/Gap Loss Summary Statistics Block is identified by the
      constant <BGLSS>.

   Interval Metric Flag (I): 2 bits

      This field is used to indicate whether the Burst/Gap Loss Summary
      Statistics metrics are Sampled, Interval or Cumulative metrics:

         I=10: Interval Duration - the reported value applies to the
         most recent measurement interval duration between successive
         metrics reports.
         I=11: Cumulative Duration - the reported value applies to the
         accumulation period characteristic of cumulative measurements.
         I=01: Sampled Value - the reported value is a sampled
         instantaneous value.
      In this document, the value I=00 is the reserved value and MUST
      NOT be used.

   Reserved: 6 bits

      This field is reserved for future definition.  In the absence of
      such a definition, the bits in this field MUST be set to zero and
      SHOULD be ignored by the receiver (See RFC6709 section 4.2).

   Block Length: 16 bits

      The constant 3, in accordance with the definition of this field in
      Section 3 of RFC 3611 [RFC3611].





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   SSRC of Source: 32 bits

      As defined in Section 4.1 of RFC3611 [RFC3611].

   Burst Loss Rate: 16 bits

      The fraction of packets lost during bursts since the beginning of
      reception, expressed as a fixed point number with the binary point
      at the left edge of the field.  This value is calculated by
      dividing Packets Loss in Bursts by Total Packets expected in
      Bursts as follows:

      Packets Loss in Bursts / Total Packets expected in Bursts

   Gap Loss Rate: 16 bits

      The fraction of packets lost during gaps since the beginning of
      reception expressed as a fixed point number with the binary point
      at the left edge of the field.  This value is calculated by
      dividing the difference between number of packets lost and Packets
      lost in Bursts by the difference between Packets Expected and
      Total Packets expected in Bursts as follows:

      (number of packets lost - Packets Lost in Bursts) / (Packets
      Expected - Total Packets expected in Bursts)

      where "number of packets lost" is obtained from standard RTCP
      [RFC3550] and Packets Expected is calculated as the difference
      between "extended last sequence number" and "extended first
      sequence number" (Interval or Cumulative) provided in the
      Measurement Identity and Information block [RFC6776].

      Note that if the metric is to be calculated on an Interval basis,
      a difference must be taken between the current and preceding
      values of "cumulative number of packets lost" in RTCP, to obtain
      the "number of packets lost" for the reporting interval.

   Burst Duration Mean:16bits

      The mean burst duration is obtained as the quotient:

      mean = Sum of Burst Durations / Number of Bursts

      where "Sum of Burst Durations" and "Number of Bursts" is obtained
      from the RTCP XR Burst/Gap Loss Block [BGLOSS].






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   Burst Duration Variance:16bits

      The variance of the burst duration is obtained using the standard
      result:

      var = ( Sum of Squares of Burst Durations - Number of Bursts *
      mean^2 ) / (Number of Bursts - 1)

      where "Sum of Squares of Burst Durations" and "Number of Bursts"is
      obtained from the RTCP XR Burst/Gap Loss Block [BGLOSS].


3.2.  Burst/Gap Discard Summary Statistics Metrics Block

   The metrics described here are intended to be used as described in
   this section, in conjunction with information from the Measurement
   Identity block [RFC6776] (which MUST be present in the same RTCP
   packet as the Burst/Gap Discard Summary Statistics block) .

   These metrics provide information relevant to statistical parameters,
   including burst discard rate, gap discard rate and are calculated at
   the receiving end of the RTP stream using burst gap discard metrics
   defined in [BGDISCARD] and other information which is sent together
   with this report block.

   Instances of this Metrics Block refer by Synchronization source
   (SSRC) to the separate auxiliary Measurement Information block
   [RFC6776] which contains measurement periods (see [RFC6776] section
   4.2).  This metrics block relies on the measurement period in the
   Measurement Information block indicating the span of the report and
   SHOULD be sent in the same compound RTCP packet as the measurement
   information block.  If the measurement period is not received in the
   same compound RTCP packet as this metric block, this metrics block
   MUST be discarded.

3.2.1.  Report Block Structure

      0                   1                   2                   3
       0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |    BT=BGDSS   | I |  Reserved |        block length           |
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |                          SSRC of Source                       |
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |          Burst Discard Rate   |        Gap Discard Rate       |
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+





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3.2.2.  Definition of Fields inBurst/Gap Discard Summary Statistics
        Block

   Block Type (BT): 8 bits

      Burst/Gap Discard Summary Statistics Block is identified by the
      constant <BGDSS>.

   Interval Metric Flag (I): 2 bits

      This field is used to indicate whether the Burst/Gap Discard
      Summary Statistics metrics are Sampled, Interval or Cumulative
      metrics:

         I=10: Interval Duration - the reported value applies to the
         most recent measurement interval duration between successive
         metrics reports.
         I=11: Cumulative Duration - the reported value applies to the
         accumulation period characteristic of cumulative measurements.
         I=01: Sampled Value - the reported value is a sampled
         instantaneous value.


      In this document, the value I=00 is the reserved value and MUST
      NOT be used.

   Reserved: 6 bits

      This field is reserved for future definition.  In the absence of
      such a definition, the bits in this field MUST be set to zero and
      SHOULD be ignored by the receiver (See RFC6709 section 4.2).

   Block Length: 16 bits

      The constant 2, in accordance with the definition of this field in
      Section 3 of RFC 3611 [RFC3611].

   SSRC of Source: 32 bits

      As defined in Section 4.1 of RFC3611 [RFC3611].

   Burst Discard Rate: 16 bits

      The fraction of packets discarded during bursts since the
      beginning of reception, expressed as a fixed point number with the
      binary point at the left edge of the field.  This value is
      calculated by dividing Packets Discarded in Bursts by Total
      Packets expected in Bursts as follows:



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      Packets Discarded in Bursts / Total Packets expected in Bursts

   Gap Discard Rate: 16 bits

      The fraction of packets discarded during gaps since the beginning
      of reception expressed as a fixed point number with the binary
      point at the left edge of the field.  This value is calculated by
      dividing the difference between number of packets discarded and
      Packets Discarded in Bursts by the difference between Packets
      Expected and Total Packets expected in Bursts as follows:

      (number of packets discarded - Packets Discarded in Bursts) /
      (Packets Expected - Total Packets expected in Bursts)

      where "number of packets discarded" is obtained from the RTCP XR
      Discard Count Block [DISCARD] and filled with the sum of packets
      discarded due to early arrival (DT=1) and packets discarded due to
      late arrival(DT=2) and Packets Expected is calculated as the
      difference between "extended last sequence number" and "extended
      first sequence number" (Interval or Cumulative) provided in the
      Measurement Information block [RFC6776].  In order for the Burst/
      Gap Discard Summary Statistics Block to be meaningful, 2 instances
      of the Discard Count block with DT=1 and DT=2 MUST be included in
      the same RTCP compound packet as the Burst/Gap Discard Summary
      Statistics Block.


4.  Application Level Metrics

4.1.  Frame Impairment Statistics Summary Metrics Block

   This block reports statistics on which frame type were affected
   beyond the information carried in the Statistics Summary Report Block
   RTCP packet specified in the section 4.6 of RFC 3611 [RFC3611].
   Information is measured at the receiving end of the RTP stream and
   recorded about thenumber of frames received, lost frames, duplicated
   frames and lost partial frames.  Such information can be useful for
   network management and video quality monitoring.













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4.1.1.  Report Block Structure

       0                   1                   2                   3
       0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |     BT=FISS   |T|   Reserved  |        block length           |
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |                        SSRC of Source                         |
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |          Begin_seq            |             End_seq           |
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |                    Number of frames received                  |
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |                      Discarded_frames                         |
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |                          Dup_frames                           |
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |                      Lost_full_frames                         |
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |                      Lost_partial_frames                      |
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

4.1.2.  Definition of Fields in Frame Impairment Summary Statistics
        Block

   Block type (BT): 8 bits

      Frame Impairment Statistics Summary Block is identified by the
      constant <FISS>.

   Picture type indicator (T): 1 bit

      This field is used to indicate the frame type to be reported.  The
      bit is set to 0 if the lost_full_frames, lost_partial_frames and
      dup_frames fields contain Key frame (reference frame) counts or 1
      if they contain Derived frame counts.  Note that if both the Key
      frame and Derivation frame report are sent, they should be sent in
      the same RTCP compound packet using two Frame Impairment Summary
      Statistics Blocks.

   Reserved: 7 bits

      This field is reserved for future definition.  In the absence of
      such a definition, the bits in this field MUST be set to zero and
      SHOULD be ignored by the receiver.






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   Block Length: 16 bits

      The constant 7, in accordance with the definition of this field in
      Section 3 of RFC 3611 [RFC3611].

   SSRC of Source: 32 bits

      As defined in Section 4.1 of RFC3611 [RFC3611].

   Begin_seq: 16 bits

      As defined in Section 4.1 of RFC 3611 [RFC3611].

   end_seq: 16 bits

      As defined in Section 4.1 of RFC 3611 [RFC3611].

   Number of frames received:32 bits

      A count of the number of frames received in the above sequence
      number interval, estimated if necessary.  If no frames have been
      received then this count SHALL be set to zero.

   Number of discarded frames (discarded_frames): 32 bits

      Number of frames discarded in the above sequence number interval.

   Number of duplicate frames (dup_frames): 32 bits

      Number of duplicate frames received in the above sequence number
      interval.

   Number of full frames lost (lost_full_frames): 32 bits

      If one frame is completely lost, this frame is regarded as one
      lost full frame.  The lost_full_frames is equivalent to the number
      of full frames lost in the above sequence number interval.

   Number of partial frames lost (lost_partial_frames): 32 bits

      If one frame is partially lost, this frame is regarded as one lost
      fractional frame.  The value of the lost_partial_frames field is
      equivalent to the number of partial frames lost in the above
      sequence number interval.







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5.  SDP Signaling

   RFC 3611 defines the use of SDP (Session Description Protocol)
   [RFC4566] for signaling the use of XR blocks.  XR blocks MAY be used
   without prior signaling.

5.1.  SDP rtcp-xr-attrib Attribute Extension

   This section augments the SDP [RFC4566] attribute "rtcp-xr" defined
   in Section 5.1 of RFC 3611 by providing three additional values of
   "xr-format" to signal the use of the report block defined in this
   document.

            xr-format = / burst-gap-loss-stat
                        / burst-gap-discard-stat
                        / frame-impairment-stat
    Burst-gap-loss-stat ="burst gap loss summary statistics"
    Burst-gap-discard-stat="burst gap discard summary statistics"
    Frame-impairment-stat="frame impairment summary statistics"

5.2.  Offer/Answer Usage

   When SDP is used in offer-answer context, the SDP Offer/Answer usage
   defined in [RFC3611] for unilateral "rtcp-xr" attribute parameters
   applies.  For detailed usage in Offer/Answer for unilateral
   parameter, refer to section 5.2 of [RFC3611].


6.  IANA Considerations

   New block types for RTCP XR are subject to IANA registration.  For
   general guidelines on IANA considerations for RTCP XR, refer to RFC
   3611.

6.1.  New RTCP XR Block Type values

   This document assigns three new block type value in the RTCP XR Block
   Type Registry:













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         Name:       BGLSS
         Long Name:  Burst/Gap Loss Summary Statistics Block
         Value       <BGLSS>
         Reference:  Section 3.1

         Name:       BGDSS
         Long Name:  Burst/Gap Discard Summary Statistics Block
         Value       <BGDSS>
         Reference:  Section 3.2

         Name:       FISS
         Long Name:  Frame Impairment Statistics Summary
         Value       <FISS>
         Reference:  Section 4.1

6.2.  New RTCP XR SDP Parameters

   This document also registers three new SDP [RFC4566] parameters for
   the "rtcp-xr" attribute in the RTCP XR SDP Parameters Registry:

    *  " burst-gap-loss-stat "
    *  " burst-gap-discard-stat "
    *  " frame-impairment-stat "

6.3.  Contact information for registrations

   The contact information for the registrations is:

       Qin Wu (sunseawq@huawei.com)
       101 Software Avenue, Yuhua District
       Nanjing, Jiangsu  210012
       China


7.  Security Considerations

   The new RTCP XR report blocks proposed in this document introduces no
   new security considerations beyond those described in RFC 3611.


8.  Acknowledgements

   The authors would like to thank Bill Ver Steeg, David R Oran, Ali
   Begen, Colin Perkins, Roni Even, Youqing Yang, Wenxiao Yu, Yinliang
   Hu, Jing Zhao, Ray van Brandenburg, Claire Bi, Dan Romascanu for
   their valuable comments and suggestions on this document.





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9.  References

9.1.  Normative References

   [BGDISCARD]
              Clark, A., Huang, R., and W. Wu, "RTP Control
              Protocol(RTCP) Extended Report (XR) Block for Burst/Gap
              Discard metric Reporting",
              draft-ietf-xrblock-rtcp-xr-burst-gap-discard-08 (work in
              progress), December 2012.

   [BGLOSS]   Clark, A., Zhang, S., Zhao, J., and Q. Wu, "RTP Control
              Protocol (RTCP) Extended Report (XR) Block for Burst/Gap
              Loss metric Reporting",
              draft-ietf-xrblock-rtcp-xr-burst-gap-loss-06 (work in
              progress), December 2012.

   [DISCARD]  Clark, A., Zorn, G., and Q. Wu, "RTP Control Protocol
              (RTCP) Extended Report (XR) Block for Discard Count metric
              Reporting", draft-ietf-xrblock-rtcp-xr-discard-09 (work in
              progress), October 2012.

   [RFC2119]  Bradner, S., "Key words for use in RFCs to Indicate
              Requirement Levels", BCP 14, RFC 2119, March 1997.

   [RFC3550]  Schulzrinne, H., Casner, S., Frederick, R., and V.
              Jacobson, "RTP: A Transport Protocol for Real-Time
              Applications", STD 64, RFC 3550, July 2003.

   [RFC3611]  Friedman, T., Caceres, R., and A. Clark, "RTP Control
              Protocol Extended Reports (RTCP XR)", RFC 3611,
              November 2003.

   [RFC4566]  Handley, M., Jacobson, V., and C. Perkins, "SDP: Session
              Description Protocol", RFC 4566, July 2006.

   [RFC6776]  Wu, Q., "Measurement Identity and information Reporting
              using SDES item and XR Block", RFC 6776, August 2012.

9.2.  Informative References

   [RFC6792]  Hunt, G., Wu, Q., and P. Arden, "Monitoring Architectures
              for RTP", RFC 6792, November 2012.


Appendix A.  Change Log

   Note to the RFC-Editor: please remove this section prior to



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Internet-Draft           Summary Stats XR Blocks           December 2012


   publication as an RFC.

A.1.  draft-ietf-xrblock-rtcp-xr-summary-stat-04

   The following are the major changes compared to 03:
   o  Editorial changes to get in line with Delay and Burst Gap related
      drafts.


Authors' Addresses

   Glen Zorn (editor)
   Network Zen
   227/358 Thanon Sanphawut
   Bang Na, Bangkok  10260
   Thailand

   Phone: +66 (0) 909-201060
   Email: glenzorn@gmail.com


   Roland Schott
   Deutsche Telekom
   Deutsche-Telekom-Allee 7
   Darmstadt  64295
   Germany

   Email: Roland.Schott@telekom.de


   Qin Wu
   Huawei
   101 Software Avenue, Yuhua District
   Nanjing, Jiangsu  210012
   China

   Email: sunseawq@huawei.com


   Rachel Huang
   Huawei
   101 Software Avenue, Yuhua District
   Nanjing  210012
   China

   Email: Rachel@huawei.com





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