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Versions: (draft-huang-xrblock-rtcp-xr-decodability) 00 01 02 03 04 05 06 07 11 12 RFC 6990

Network Working Group                                           R. Huang
Internet-Draft                                                     Q. Wu
Intended status: Standards Track                                  Huawei
Expires: June 21, 2013                                         H. Asaeda
                                                                    NICT
                                                            G. Zorn, Ed.
                                                             Network Zen
                                                       December 18, 2012


    RTP Control Protocol (RTCP) Extended Report (XR) Block for MPEG
       Transport Stream Decodability Statistics Metric reporting
               draft-ietf-xrblock-rtcp-xr-decodability-04

Abstract

   An MPEG Transport Stream (TS) is a standard container format used in
   the transmission and storage of multimedia data.  Unicast/Multicast/
   Broadcast MPEG-TS over RTP is widely deployed in IPTV systems.  This
   document defines an RTP Control Protocol (RTCP) Extended Report (XR)
   Block that allows the reporting of MPEG Transport Stream decodability
   statistics metrics related to transmissions of MPEG-TS over RTP.

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 21, 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



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   publication of this document.  Please review these documents
   carefully, as they describe your rights and restrictions with respect
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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.  MPEG Transport Stream Decodability 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.  MPEG Transport Stream Decodability Statistics Metric
       Report Block  . . . . . . . . . . . . . . . . . . . . . . . . . 4
   4.  SDP Signaling . . . . . . . . . . . . . . . . . . . . . . . . . 7
     4.1.  SDP rtcp-xr-attrib Atrribute Extension  . . . . . . . . . . 7
     4.2.  Offer/Answer Usage  . . . . . . . . . . . . . . . . . . . . 8
   5.  IANA Considerations . . . . . . . . . . . . . . . . . . . . . . 8
   6.  Security Considerations . . . . . . . . . . . . . . . . . . . . 8
   7.  Acknowledgements  . . . . . . . . . . . . . . . . . . . . . . . 8
   8.  References  . . . . . . . . . . . . . . . . . . . . . . . . . . 9
     8.1.  Normative References  . . . . . . . . . . . . . . . . . . . 9
     8.2.  Informative References  . . . . . . . . . . . . . . . . . . 9
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . . . 9






















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1.  Introduction

1.1.  MPEG Transport Stream Decodability Metrics

   The European Telecommunications Standards Institute (ETSI) has
   defined a set of syntax and information consistency tests and
   corresponding indicators [ETSI] that are recommended for the
   monitoring of MPEG-2 Transport Streams [ISO-IEC.13818-1.2007].  The
   tests and corresponding indicators are grouped according to priority:

   o  First priority - Necessary for de-codability (basic monitoring)
   o  Second priority - Recommended for continuous or periodic
      monitoring
   o  Third priority - Recommended for application-dependant monitoring

   This memo is based on information consistency tests and resulting
   indicators defined by ETSI [ETSI] and defines a new block type to
   augment those defined in Freidman, et al. [RFC3611] for use with
   Transport Stream (TS) [ISO-IEC.13818-1.2007].  The new block type
   supports reporting of the number of occurrences of each indicator in
   the first and second priorities; third priority indicators are not
   supported.

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 Performance Metrics Framework [RFC6390] provides guidance on the
   definition and specification of performance metrics.  The RTP
   Monitoring Architectures [RFC6792] provides guideline for reporting
   block format using RTCP XR.  The new report block described in this
   memo is in compliance with the monitoring architecture specified in
   [RFC6792] and the Performance Metrics Framework [RFC6390].

1.4.  Applicability

   These metrics are applicable to any type of RTP application that uses
   the MPEG-TS standard format for multimedia data; for example, MPEG4
   TS content over RTP.  This new block type can be useful for measuring
   content stream or TS quality by checking TS header information [ETSI]
   and identifying the existence, and characterizing the severity, of
   bitstream packetization problems which may affect users' perception
   of a service delivered over RTP; it may also be useful for verifying



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   the continued correct operation of an existing system management
   tool.


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].


3.  MPEG Transport Stream Decodability Statistics Metric Report Block

   This block reports MPEG transport stream decodability statistics
   metrics beyond the information carried in the standard RTCP packet
   format, which are measured at the receiving end of the RTP stream.
   It defines eight metrics based on ETSI TR 101 290.  Information is
   reported about basic monitoring parameters necessary to ensure that
   the TS can be decoded including:

   o  Transport Stream Synchronization Losses
   o  Sync byte errors
   o  Continuity count errors

   and continuous monitoring parameters including:

   o  Transport errors
   o  Program Clock Reference (PCR) errors
   o  PCR repetition errors
   o  PCR discontinuity indicator errors
   o  Presentation Time Stamp (PTS) errors

   The other parameters are ignored since they do not apply to all MPEG
   implementations.  For further information on these parameters, see
   [ETSI].

   The MPEG-TS Decodability Metrics Block has the following format:












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       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=TSDM   |    Reserved   |         block length          |
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |                     SSRC of source                            |
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |          begin_seq            |             end_seq           |
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |                         Number of TSs                         |
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |                      TS_sync_loss_count                       |
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |                      Sync_byte_error_count                    |
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |                  Continuity_count_error_count                 |
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |                      Transport_error_count                    |
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |                        PCR_error_count                        |
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |                   PCR_repetition_error_count                  |
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |            PCR_discontinuity_indicator_error_count            |
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |                       PTS_error_count                         |
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

   block type (BT): 8 bits

      A TR 101 290 MPEG-TS decodability metrics report block is
      identified by the constant <TSDM>.

   Reserved: 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
      SHOULD be ignored by the receiver.

   block length: 16 bits

      The constant 11, in accordance with the definition of this field
      in Section 3 of RFC 3611.  The block MUST be discarded if the
      block length is set to a different value.







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   SSRC of source: 32 bits

      As defined in Section 4.1 of RFC 3611.

   begin_seq: 16 bits

      As defined in Section 4.1 of RFC 3611.

   end_seq: 16 bits

      As defined in Section 4.1 of RFC 3611.

   Number of TSs: 32 bits

      Number of TS in the above sequence number interval.

   TS_sync_loss_count: 32 bits

      Number of TS_sync_loss errors in the above sequence number
      interval.  It is calculated based on the occurrence of errors for
      "TS_sync_loss"parameter defined in the section 5.2.1 of ETSI TR
      101 290 (See section 5.5.1 of ETSI TR 101 290).

   Sync_byte_error_count: 32 bits

      Number of sync_byte_errors in the above sequence number interval.
      It is calculated in the same way as TS_sync_loss_count, i.e.,based
      on the occurrence of errors for "Sync_byte_error"parameter defined
      in the section 5.2.1 of ETSI TR 101 290.

   Continuity_count_error_count: 32 bits

      Number of Continuity_count_errors in the above sequence number
      interval.  Simiarly, it is calculated based on the occurrence of
      errors for "Continuity_count_error"parameter defined in the
      section 5.2.1 of ETSI TR 101 290.

   Transport_error_count: 32 bits

      Number of Transport_errors in the above sequence number interval.
      Simiarly, it is calculated based on the occurrence of errors for
      "Transport_error" parameter defined in the section 5.2.2 of ETSI
      TR 101 290.








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   PCR_error_count: 32 bits

      Number of PCR_errors in the above sequence number interval.
      Simiarly, it is calculated based on the occurrence of errors for
      "PCR_error"parameter defined in the section 5.2.2 of ETSI TR 101
      290.

   PCR_repetition_error_count: 32 bits

      Number of PCR_repetition_errors in the above sequence number
      interval.  Simiarly, it is calculated based on the occurrence of
      errors for "PCR_repetition_error"parameter defined in the section
      5.2.2 of ETSI TR 101 290.

   PCR_discontinuity_indicator_error_count: 32 bits

      Number of PCR_discontinuity_indicator_errors in the above sequence
      number interval.  Simiarly, it is calculated based on the
      occurrence of errors for
      "PCR_discontinuity_indicator_error"parameter defined in the
      section 5.2.2 of ETSI TR 101 290.

   PTS_error_count: 32 bits

      Number of PTS_errors in the above sequence number interval.
      Simiarly, it is calculated based on the occurrence of errors for
      "PTS_error"parameter defined in the section 5.2.2 of ETSI TR 101
      290.



4.  SDP Signaling

   RFC 3611 defines the use of SDP (Session Description Protocol)
   [RFC4566] for signaling the use of RTCP XR blocks.  However XR blocks
   MAY be used without prior signaling (See section 5 of RFC3611).

4.1.  SDP rtcp-xr-attrib Atrribute Extension

   This session augments the SDP attribute "rtcp-xr" defined in Section
   5.1 of RFC 3611 by providing an additional value of "xr-format" to
   signal the use of the report block defined in this document.

   xr-format =/  ts-decodability-metrics

         ts-decodability-metrics = "ts-decodability-metrics"





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4.2.  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 of Offer/Answer for unilateral
   parameter, refer to section 5.2 of [RFC3611].


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 ofRFC 3611.

   This document assigns one new block type value in the "RTP Control
   Protocol Extended Reports (RTCP XR) Block Type Registry " Registry:

      Name:       TSDM
      Long Name:  TR 101 290 MPEG Transport Stream Decodability Metrics
      Value       <TSDM>
      Reference:  Section 3

   This document also registers one SDP [RFC4566] parameters for the
   "rtcp-xr" attribute in the "RTP Control Protocol Extended Reports
   (RTCP XR) Session Description Protocol (SDP) Parameters Registry":

      *  "ts-decodability-metrics"

   The contact information for the registrations is:

                    Qin Wu
                    sunseawq@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 RFC 3611.


7.  Acknowledgements

   Thanks to Ray van Brandenburg, Claire Bi,Colin Perkin and Dan
   Romascanufor useful review and suggestions.





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8.  References

8.1.  Normative References

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

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

   [RFC3550]  Schulzrinne, H., "RTP: A Transport Protocol for Real-Time
              Applications", 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.

8.2.  Informative References

   [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.

   [RFC6390]  Clark, A. and B. Claise, "Guidelines for Considering New
              Performance Metric Development", BCP 170, RFC 6390,
              October 2011.

   [RFC6792]  Wu, Q., Hunt, G., and P. Arden, "Guidelines for Use of the
              RTP Monitoring Framework", RFC 6792, November 2012.


Authors' Addresses

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

   Email: rachel.huang@huawei.com





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

   Email: bill.wu@huawei.com


   Hitoshi Asaeda
   National Institute of Information and Communications Technology
   4-2-1 Nukui-Kitamachi
   Koganei, Tokyo  184-8795
   Japan

   Email: asaeda@nict.go.jp


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

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

























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