Network Working Group R. Huang
Internet-Draft Q. Wu
Intended status: Standards Track Huawei
Expires: January 17, 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
This Internet-Draft is submitted in full conformance with the
provisions of BCP 78 and BCP 79.
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This Internet-Draft will expire on January 17, 2013.
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carefully, as they describe your rights and restrictions with respect
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Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . 3
2. Terminology . . . . . . . . . . . . . . . . . . . . . . . . . . 3
2.1. Standards Language . . . . . . . . . . . . . . . . . . . . 3
3. TR 101 290 Decodability Statistics Metric Report Block . . . . 3
4. SDP Signaling . . . . . . . . . . . . . . . . . . . . . . . . . 6
5. IANA Considerations . . . . . . . . . . . . . . . . . . . . . . 6
6. Security Considerations . . . . . . . . . . . . . . . . . . . . 7
7. References . . . . . . . . . . . . . . . . . . . . . . . . . . 7
7.1. Normative References . . . . . . . . . . . . . . . . . . . 7
7.2. Informative References . . . . . . . . . . . . . . . . . . 8
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . . 8
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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:
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 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
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
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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 are not applied to all
the MPEG implentations. For further information on these parameters,
see [ETSI]
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 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 |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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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.
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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
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]:
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].
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This document assigns one new block type value 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 Parameter Registry:
* "decodability-metrics"
The contact information for the registrations is:
Rachel Huang
rachel.huang@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].
7. References
7.1. 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.
[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,
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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
[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.
[MONARCH] Wu, Q., Hunt, G., and P. , "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.
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
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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
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