Network Working Group R. Huang
Internet-Draft Q. Wu
Intended status: Standards Track Huawei
Expires: January 15, 2013 H. Asaeda
Keio University
G. Zorn, Ed.
Network Zen
July 16, 2012

RTCP XR Report Block for TS Decodability Statistics Metric reporting
draft-huang-xrblock-rtcp-xr-decodability-05

Abstract

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

Status of This Memo

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Table of Contents

1. Introduction

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

This draft is based on information consistency tests and resulting indicators in the [ETSI] and defines a new block type to augment those defined in [RFC3611] for use with Transport Stream (TS) [ISO-IEC.13818-1.2007]. The new block type supports reporting of the number of each indicator in the first and second priority;third priority indicators are not supported. 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 problem which may affect users' perception of a service delivered over RTP; it may also be useful for verifying the continued correct operation of an existing system management.

The new report block is in compliance with the monitoring architecture specified in [MONARCH] and the Performance Metrics Framework [RFC6390]. The metric is applicable to any type of RTP application that uses TS standard format for container of multimedia data, for example MPEG4 TS content over RTP.

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. TR 101 290 Decodability Statistics Metric Report Block

 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 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                         |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

This block reports decodability statistics metrics beyond the information carried in the standard RTCP packet format. 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:



[ETSI]

The Decodability Metrics Block has the following format:

and continuous monitoring parameters including:

The other parameters are ignored since they are not applied to all the MPEG implentations. For further information on these parameters, see

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 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 [RFC3611].

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 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.

Sync_byte_error_count: 32 bits


Number of sync_byte_errors in the above sequence number interval.

Continuity_count_error_count: 32 bits


Number of Continuity_count_errors in the above sequence number interval.

Transport_error_count: 32 bits


Number of Transport_errors in the above sequence number interval.

PCR_error_count: 32 bits


Number of PCR_errors in the above sequence number interval.

PCR_repetition_error_count: 32 bits


Number of PCR_repetition_errors in the above sequence number interval.

PCR_discontinuity_indicator_error_count: 32 bits


Number of PCR_discontinuity_indicator_errors in the above sequence number interval.

PTS_error_count: 32 bits


Number of PTS_errors in the above sequence number interval.

4. SDP Signaling

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

   xr-format = decodability-metrics

      decodability-metrics = "decodability-metrics" 

One new parameter is defined for the report block defined in this document to be used with Session Description Protocol (SDP) [RFC4566] using the Augmented Backus-Naur Form (ABNF) [RFC5234]. It has the following syntax within the "rtcp-xr" attribute [RFC3611]: RFC 3611 [RFC3611] for a detailed description and the full syntax of the "rtcp-xr" attribute.

5. IANA Considerations

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

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 value in the RTCP XR Block Type Registry: [RFC4566] parameters for the "rtcp-xr" attribute in the RTCP XR SDP Parameter Registry:

The contact information for the registrations is:

This document also registers one SDP

6. Security Considerations

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

7. References

7.1. Normative References

[RFC2250] Hoffman, D., Fernando, G., Goyal, V. and M.R. Civanlar, "RTP Payload Format for MPEG1/MPEG2 Video", RFC 2250, January 1998.
[RFC3611] Friedman, T., Caceres, R. and A. Clark, "RTP Control Protocol Extended Reports (RTCP XR)", RFC 3611, November 2003.
[RFC2119] Bradner, S., "Key words for use in RFCs to Indicate Requirement Levels", BCP 14, RFC 2119, March 1997.
[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.
[RFC3550] Schulzrinne, H., Casner, S., Frederick, R. and V. Jacobson, "RTP: A Transport Protocol for Real-Time Applications", STD 64, RFC 3550, July 2003.
[ETSI] ETSI, "Digital Video Broadcasting (DVB); Measurement guidelines for DVB systems", Technical Report TR 101 290, 2001.

7.2. Informative References

[MONARCH] Wu, Q., Hunt, G., "Monitoring Architectures for RTP", ID draft-ietf-avtcore-monarch-17, June 2012.
[RFC6390] Clark, A. and B. Claise, "Guidelines for Considering New Performance Metric Development", BCP 170, RFC 6390, October 2011.
[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.

Authors' Addresses

Rachel Huang Huawei 101 Software Avenue, Yuhua District Nanjing, 210012 China EMail: rachel.huang@huawei.com
Qin Wu Huawei 101 Software Avenue, Yuhua District Nanjing, Jiangsu 210012 China EMail: bill.wu@huawei.com
Hitoshi Asaeda Keio University Graduate School of Media and Governance 5322 Endo Fujisawa, Kanagawa 252-0882 Japan EMail: asaeda@wide.ad.jp
Glen Zorn (editor) Network Zen 227/358 Thanon Sanphawut Bang Na, Bangkok, 10260 Thailand Phone: +66 (0) 87-040-4617 EMail: glenzorn@gmail.com