Network Working Group                                           R. Huang
Internet-Draft                                                     Q. Wu
Intended status: Standards Track                                  Huawei
Expires: August 16, 2011                                       H. Asaeda
                                                         Keio University
                                                       February 12, 2011


  RTCP XR Report Block for TS Decodability Statistics Metric reporting
              draft-huang-xrblock-rtcp-xr-decodability-00

Abstract

   This document defines an RTCP XR Report Block that allows the
   reporting of Decodability Statistics Metric used for Transport
   Stream.

Status of this Memo

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   This Internet-Draft will expire on August 16, 2011.

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   This document may contain material from IETF Documents or IETF
   Contributions published or made publicly available before November
   10, 2008.  The person(s) controlling the copyright in some of this
   material may not have granted the IETF Trust the right to allow
   modifications of such material outside the IETF Standards Process.
   Without obtaining an adequate license from the person(s) controlling
   the copyright in such materials, this document may not be modified
   outside the IETF Standards Process, and derivative works of it may
   not be created outside the IETF Standards Process, except to format
   it for publication as an RFC or to translate it into languages other
   than English.


Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . . . 3
   2.  Terminology . . . . . . . . . . . . . . . . . . . . . . . . . . 3
     2.1.  Standards Language  . . . . . . . . . . . . . . . . . . . . 3
     2.2.  Acronyms  . . . . . . . . . . . . . . . . . . . . . . . . . 3
   3.  TR 101 290 Decodability Statistics Metric Report Block  . . . . 3
   4.  SDP Signaling . . . . . . . . . . . . . . . . . . . . . . . . . 5
   5.  IANA Considerations . . . . . . . . . . . . . . . . . . . . . . 6
   6.  Security Considerations . . . . . . . . . . . . . . . . . . . . 6
   7.  References  . . . . . . . . . . . . . . . . . . . . . . . . . . 7
     7.1.  Normative References  . . . . . . . . . . . . . . . . . . . 7
     7.2.  Informative References  . . . . . . . . . . . . . . . . . . 7
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . . . 8
























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1.  Introduction

   This draft defines a new block type to augment those defined in
   [RFC3611] for use in Transport Stream.  The new block type supports
   the reporting of consistency of Transport Stream [ETSI]by checking TS
   header information.  This new block type can be useful for
   identifying the existence, and characterizing the severity, of a
   packet transport problem which may affect users' perception of a
   service delivered over RTP, also useful for Verifying the continued
   correct operation of an existing system management and providing
   accurate measures of Transport Stream quality for operators.

   The metric is applicable to any other types of RTP application that
   use TS standard format for transmission and storage of audio, video,
   and data.


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:

2.2.  Acronyms

   SSRC
      Synchronization Source [RFC3550]

   TS
      Transport Stream [ISO-IEC.13818-1.2007]


3.  TR 101 290 Decodability Statistics Metric Report Block

   This block reports decodability statistics metric beyond the
   information carried in the standard RTCP packet format.  Information
   is recorded about basic monitoring parameters necessary to ensure
   that the TS can be decoded including the number of Transport Stream
   Synchronization Losses, Sync byte errors, Continuity count errors,
   and continuous monitoring parameters including Transport errors,
   Program Clock Reference (PCR) errors, PCR repetition errors, PCR
   discontinuity indicator errors, and Presentation Time Stamp (PTS)
   errors [ETSI].  Such information can be useful for network management
   and real time application quality monitoring.



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   Note that this metric report block is not only applicable to MPEG-2
   transport streams[RFC2250],but also applicable to any other Transport
   Streams that adopt other audio and video codec.

   The Decodability Metrics Block has the following format:

    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=TBD    |      rvd      |         block length          |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |                        SSRC of source                         |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |          begin_seq            |             end_seq           |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |       Number of packets       |         Number of TSs         |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |             Transport Stream Synchronization Losses           |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |                      Sync byte errors                         |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |                  Continuity count errors                      |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |                      Transport errors                         |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |                         PCR errors                            |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |                   PCR repetition errors                       |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |            PCR discontinuity indicator errors                 |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
   |                         PTS errors                            |
   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

   block type (BT): 8 bits
      A TR 101 290 decodability metrics report block is identified by
      the constant <TDM>.

   rvd: 8 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
      MUST be ignored by the receiver.

   block length: 16 bits
      The constant 10, 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].

   begin_seq: 16 bits
      As defined in Section 4.1 of [RFC3611].

   end_seq: 16 bits
      As defined in Section 4.1 of [RFC3611].

   Number of Packets: 16 bits
      Number of RTP packets in the above sequence number interval.

   Number of TSs: 16 bits
      Number of Transport Streams in the above sequence number interval.

   Transport Stream Synchronization Losses: 32 bits
      Number of Transport Stream Synchronization Losses in the above
      sequence number interval.

   Sync byte errors: 32 bits
      Number of Transport sync byte errors in the above sequence number
      interval.
   Continuity count error: 32 bits
      Number of Transport Continuity count errors in the above sequence
      number interval.

   Transport errors: 32 bits
      Number of Transport errors in the above sequence number interval.

   PCR errors: 32 bits
      Number of PCR errors in the above sequence number interval.

   PCR repetition errors: 32 bits
      Number of Transport PCR repetition errors in the above sequence
      number interval.

   PCR discontinuity indicator errors: 32 bits
      Number of PCR discontinuity indicator errors in the above sequence
      number interval.

   PTS errors: 32 bits
      Number of PTS errors in the above sequence number interval.



4.  SDP Signaling

   One new parameter is defined for the one report blocks defined in



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   this document to be used with Session Description Protocol (SDP)
   [RFC4566] using the Augmented Backus-Naur Form (ABNF) [RFC5234].
   They have the following syntax within the "rtcp-xr" attribute
   [RFC3611]:

   rtcp-xr-attrib =  "a=rtcp-xr:"
                     [xr-format *(SP xr-format)] CRLF

      xr-format = decodability-metrics

         decodability-metrics = "decodability-metrics"

   Refer to Section 5.1 of RFC 3611 [RFC3611] for a detailed description
   and the full syntax of the "rtcp-xr" attribute.


5.  IANA Considerations

   New report block types for RTCP XR are subject to IANA registration.
   For general guidelines on IANA allocations for RTCP XR, refer to
   Section 6.2 of [RFC3611].

   This document assigns one new block type values in the RTCP XR Block
   Type Registry:

      Name:       TDM
      Long Name:  TR 101 290 Decodability Metrics
      Value       <TDM>
      Reference:  section 3

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

      *  "decodability-metrics"

   The contact information for the registrations is:

                    Rachel Huang
                    Rachel@huawei.com
                    101 Software Avenue, Yuhua District
                    Nanjing, JiangSu 210012 China


6.  Security Considerations

   This proposed RTCP XR report block introduces no new security
   considerations beyond those described in [RFC3611].




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7.  References

7.1.  Normative References

   [ETSI]     ETSI, "Digital Video Broadcasting (DVB); Measurement
              guidelines for DVB systems", Technical Report TR 101 290,
              2001.

   [ISO-IEC.13818-1.2007]
              International Organization for Standardization,
              "Information technology - Generic coding of moving
              pictures and associated audio information: Systems",
              ISO International Standard 13818-1, October 2007.

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

   [RFC2250]  Hoffman, D., Fernando, G., Goyal, V., and M. Civanlar,
              "RTP Payload Format for MPEG1/MPEG2 Video", RFC 2250,
              January 1998.

   [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.

   [RFC5234]  Crocker, D. and P. Overell, "Augmented BNF for Syntax
              Specifications: ABNF", STD 68, RFC 5234, January 2008.

7.2.  Informative References

   [DSLF]     Rahrer, T., Ed., Fiandra, Ed., and Wright, Ed., "Triple-
              play Services Quality of Experience (QoE) Requirements",
              DSL Forum Technical Report TR-126, December 2006.

   [G.1082]   ITU-T, "Measurement-based methods for improving the
              robustness of IPTV performance", ITU-T
              Recommendation G.1082, April 2009.

   [I-D.ietf-pmol-metrics-framework-02]
              Clark, A., "Framework for Performance Metric Development".




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   [IEEE]     IEEE, "Human Perception of Jitter and Media
              Synchronization", IEEE Journal on Selected Areas in
              Communications Vol. 14, No. 1, January 1996.

   [P.NAMS]   ITU-T, "Non-intrusive parametric model for the Assessment
              of performance of Multimedia Streaming", ITU-T
              Recommendation P.NAMS, November 2009.


Authors' Addresses

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

   Email: Rachel@huawei.com


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

   Email: sunseawq@huawei.com


   Hitoshi Asaeda
   Keio University
   Graduate School of Media and Governance 5322 Endo
   Fujisawa, Kanagawa  252-0882
   Japan

   Email: asaeda@wide.ad.jp















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