draft-ietf-xrblock-rtcp-xr-decodability-10.txt   draft-ietf-xrblock-rtcp-xr-decodability-11.txt 
Network Working Group R. Huang Network Working Group R. Huang
Internet-Draft Q. Wu Internet-Draft Q. Wu
Intended status: Standards Track Huawei Intended status: Standards Track Huawei
Expires: September 22, 2013 H. Asaeda Expires: October 9, 2013 H. Asaeda
NICT NICT
G. Zorn G. Zorn
Network Zen Network Zen
March 21, 2013 April 7, 2013
RTP Control Protocol (RTCP) Extended Report (XR) Block for MPEG2 RTP Control Protocol (RTCP) Extended Report (XR) Block for MPEG2
Transport Stream (TS) Program Specific Information (PSI) Independent Transport Stream (TS) Program Specific Information (PSI) Independent
Decodability Statistics Metrics reporting Decodability Statistics Metrics reporting
draft-ietf-xrblock-rtcp-xr-decodability-10 draft-ietf-xrblock-rtcp-xr-decodability-11
Abstract Abstract
An MPEG2 Transport Stream (TS) is a standard container format used in An MPEG2 Transport Stream (TS) is a standard container format used in
the transmission and storage of multimedia data. Unicast/Multicast the transmission and storage of multimedia data. Unicast/Multicast
MPEG2 TS over RTP is widely deployed in IPTV systems. This document MPEG2 TS over RTP is widely deployed in IPTV systems. This document
defines an RTP Control Protocol (RTCP) Extended Report (XR) Block defines an RTP Control Protocol (RTCP) Extended Report (XR) Block
that allows the reporting of MPEG2 TS decodability statistics metrics that allows the reporting of MPEG2 TS decodability statistics metrics
related to transmissions of MPEG2 TS over RTP. The metrics specified related to transmissions of MPEG2 TS over RTP. The metrics specified
in the RTCP XR Block are not dependent on Program specific in the RTCP XR Block are not dependent on Program specific
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Internet-Drafts are working documents of the Internet Engineering Internet-Drafts are working documents of the Internet Engineering
Task Force (IETF). Note that other groups may also distribute Task Force (IETF). Note that other groups may also distribute
working documents as Internet-Drafts. The list of current Internet- working documents as Internet-Drafts. The list of current Internet-
Drafts is at http://datatracker.ietf.org/drafts/current/. Drafts is at http://datatracker.ietf.org/drafts/current/.
Internet-Drafts are draft documents valid for a maximum of six months Internet-Drafts are draft documents valid for a maximum of six months
and may be updated, replaced, or obsoleted by other documents at any and may be updated, replaced, or obsoleted by other documents at any
time. It is inappropriate to use Internet-Drafts as reference time. It is inappropriate to use Internet-Drafts as reference
material or to cite them other than as "work in progress." material or to cite them other than as "work in progress."
This Internet-Draft will expire on September 22, 2013. This Internet-Draft will expire on October 9, 2013.
Copyright Notice Copyright Notice
Copyright (c) 2013 IETF Trust and the persons identified as the Copyright (c) 2013 IETF Trust and the persons identified as the
document authors. All rights reserved. document authors. All rights reserved.
This document is subject to BCP 78 and the IETF Trust's Legal This document is subject to BCP 78 and the IETF Trust's Legal
Provisions Relating to IETF Documents Provisions Relating to IETF Documents
(http://trustee.ietf.org/license-info) in effect on the date of (http://trustee.ietf.org/license-info) in effect on the date of
publication of this document. Please review these documents publication of this document. Please review these documents
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1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . 3 1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . 3
1.1. MPEG2 Transport Stream Decodability Metrics . . . . . . . 3 1.1. MPEG2 Transport Stream Decodability Metrics . . . . . . . 3
1.2. RTCP and RTCP XR Reports . . . . . . . . . . . . . . . . . 3 1.2. RTCP and RTCP XR Reports . . . . . . . . . . . . . . . . . 3
1.3. Performance Metrics Framework . . . . . . . . . . . . . . 3 1.3. Performance Metrics Framework . . . . . . . . . . . . . . 3
1.4. Applicability . . . . . . . . . . . . . . . . . . . . . . 3 1.4. Applicability . . . . . . . . . . . . . . . . . . . . . . 3
2. Terminology . . . . . . . . . . . . . . . . . . . . . . . . . 4 2. Terminology . . . . . . . . . . . . . . . . . . . . . . . . . 4
2.1. Standards Language . . . . . . . . . . . . . . . . . . . . 4 2.1. Standards Language . . . . . . . . . . . . . . . . . . . . 4
3. MPEG2 TS PSI Independent Decodability Statistics Metrics 3. MPEG2 TS PSI Independent Decodability Statistics Metrics
Block . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 Block . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
4. SDP Signaling . . . . . . . . . . . . . . . . . . . . . . . . 7 4. SDP Signaling . . . . . . . . . . . . . . . . . . . . . . . . 7
4.1. SDP rtcp-xr-attrib Attribute Extension . . . . . . . . . . 7 4.1. SDP rtcp-xr-attrib Attribute Extension . . . . . . . . . . 8
4.2. Offer/Answer Usage . . . . . . . . . . . . . . . . . . . . 8 4.2. Offer/Answer Usage . . . . . . . . . . . . . . . . . . . . 8
5. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 8 5. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 8
5.1. New RTCP XR Block Type value . . . . . . . . . . . . . . . 8 5.1. New RTCP XR Block Type value . . . . . . . . . . . . . . . 8
5.2. New RTCP XR SDP Parameter . . . . . . . . . . . . . . . . 8 5.2. New RTCP XR SDP Parameter . . . . . . . . . . . . . . . . 8
5.3. Contact information for registrations . . . . . . . . . . 8 5.3. Contact information for registrations . . . . . . . . . . 8
6. Security Considerations . . . . . . . . . . . . . . . . . . . 8 6. Security Considerations . . . . . . . . . . . . . . . . . . . 9
7. Acknowledgements . . . . . . . . . . . . . . . . . . . . . . . 9 7. Acknowledgements . . . . . . . . . . . . . . . . . . . . . . . 9
8. References . . . . . . . . . . . . . . . . . . . . . . . . . . 9 8. References . . . . . . . . . . . . . . . . . . . . . . . . . . 9
8.1. Normative References . . . . . . . . . . . . . . . . . . . 9 8.1. Normative References . . . . . . . . . . . . . . . . . . . 9
8.2. Informative References . . . . . . . . . . . . . . . . . . 9 8.2. Informative References . . . . . . . . . . . . . . . . . . 9
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . . 10 Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . . 10
1. Introduction 1. Introduction
1.1. MPEG2 Transport Stream Decodability Metrics 1.1. MPEG2 Transport Stream Decodability Metrics
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monitoring of MPEG2 Transport Streams [ISO-IEC.13818-1.2007]. The monitoring of MPEG2 Transport Streams [ISO-IEC.13818-1.2007]. The
tests and corresponding indicators are grouped according to priority: tests and corresponding indicators are grouped according to priority:
o First priority - Necessary for decodability (basic monitoring) o First priority - Necessary for decodability (basic monitoring)
o Second priority - Recommended for continuous or periodic o Second priority - Recommended for continuous or periodic
monitoring monitoring
o Third priority - Recommended for application-dependent monitoring o Third priority - Recommended for application-dependent monitoring
This memo is based on information consistency tests and resulting This memo is based on information consistency tests and resulting
indicators defined by ETSI [ETSI] and defines a new block type to indicators defined by ETSI [ETSI] and defines a new block type to
augment those defined in Freidman, et al. [RFC3611] for use with augment those defined in [RFC3611] for use with MPEG2 Transport
MPEG2 Transport Stream (TS) [ISO-IEC.13818-1.2007]. The new block Stream (TS) [ISO-IEC.13818-1.2007]. The new block type supports
type supports reporting of the number of occurrences of each Program reporting of the number of occurrences of each Program Specific
Specific Information (PSI) Independent indicator in the first and Information (PSI) Independent indicator in the first and second
second priorities; third priority indicators are not supported. priorities; third priority indicators are not supported.
1.2. RTCP and RTCP XR Reports 1.2. RTCP and RTCP XR Reports
The use of RTCP for reporting is defined in [RFC3550]. [RFC3611] The use of RTCP for reporting is defined in [RFC3550]. [RFC3611]
defined an extensible structure for reporting using an RTCP Extended defined an extensible structure for reporting using an RTCP Extended
Report (XR). This document defines a new Extended Report block for Report (XR). This document defines a new Extended Report block for
use with [RFC3550] and [RFC3611]. use with [RFC3550] and [RFC3611].
1.3. Performance Metrics Framework 1.3. Performance Metrics Framework
The Performance Metrics Framework [RFC6390] provides guidance on the The Performance Metrics Framework [RFC6390] provides guidance on the
definition and specification of performance metrics. The RTP definition and specification of performance metrics. The RTP
Monitoring Architectures [RFC6792] provides guideline for reporting Monitoring Architectures [RFC6792] provides guideline for reporting
block format using RTCP XR. The new report block described in this block format using RTCP XR. The new report block described in this
memo is in compliance with the monitoring architecture specified in memo is in compliance with the monitoring architecture specified in
[RFC6792] and the Performance Metrics Framework [RFC6390]. [RFC6792] and the Performance Metrics Framework [RFC6390].
1.4. Applicability 1.4. Applicability
These metrics are applicable to any type of RTP application that uses This block type allows a counts of MPEG Transport Stream quality
the MPEG2 TS standard format for multimedia data; for example, MPEG4 metrics that are measured in accordance with ETSI TR 101290 [ETSI] to
over MPEG2 TS over RTP. This new block type can be useful for be reported by an endpoint. These metrics are useful for identifying
measuring content stream or TS quality by checking TS header bitstream packetization and transport stream encoding problems that
information [ETSI] and identifying the existence, and characterizing may affect the user's perception of a video service delivered over
the severity, of bitstream packetization problems which may affect RTP.
users' perception of a service delivered over RTP; it may also be
useful for verifying the continued correct operation of an existing
system management tool.
2. Terminology 2. Terminology
2.1. Standards Language 2.1. Standards Language
The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT", The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
"SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this
document are to be interpreted as described in RFC 2119 [RFC2119]. document are to be interpreted as described in RFC 2119 [RFC2119].
3. MPEG2 TS PSI Independent Decodability Statistics Metrics Block 3. MPEG2 TS PSI Independent Decodability Statistics Metrics Block
This block reports MPEG2 TS PSI Independent decodability statistics ETSI TR 101290 [ETSI] generally defines metrics related to error
metrics beyond the information carried in the standard RTCP packet events while this document contains counts of those metrics defined
format, which are measured at the receiving end of the RTP stream. in [ETSI]. The block defined in this document reports MPEG2 TS PSI
It describes eight metrics specified in [ETSI]. Information is Independent decodability statistics metrics beyond the information
reported about basic monitoring parameters necessary to ensure that carried in the standard RTCP packet format, which are measured at the
the TS can be decoded including: receiving end of the RTP stream. It contains counts of eight metrics
defined in ETSI TR 101290 [ETSI]. Information is reported about
basic monitoring parameters necessary to ensure that the TS can be
decoded including:
o Transport Stream Synchronization Losses o Transport Stream Synchronization Losses
o Sync byte errors o Sync byte errors
o Continuity count errors o Continuity count errors
and continuous monitoring parameters necessary to ensure the and continuous monitoring parameters necessary to ensure the
continuous decoding including: continuous decoding including:
o Transport errors o Transport errors
o Program Clock Reference (PCR) errors o Program Clock Reference (PCR) errors
o PCR repetition errors o PCR repetition errors
o PCR discontinuity indicator errors o PCR discontinuity indicator errors
o PCR accuracy errors o PCR accuracy errors
o Presentation Time Stamp (PTS) errors o Presentation Time Stamp (PTS) errors
The other parameters are ignored since they do not apply to all MPEG2 The other parameters are ignored since they do not apply to all MPEG2
implementations. For further information on these parameters, see implementations. For further information on these parameters, see
[ETSI]. [ETSI]. Note that when the report of this block spans across more
than one measurement intervals [RFC6776], the count of the metrics
(e.g., Sync byte errors, PCR errors )defined in [ETSI] may reflect a
problem in the current or previous measurement interval.
The MPEG2 TS PSI Independent Decodability Metrics Block has the The MPEG2 TS PSI Independent Decodability Metrics Block has the
following format: following format:
0 1 2 3 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 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=MTPID | Reserved | block length | | BT=MTPID | Reserved | block length |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| SSRC of source | | SSRC of source |
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| PTS_error_count | | PTS_error_count |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
block type (BT): 8 bits block type (BT): 8 bits
The MPEG2 TS PSI Independent Decodability Metrics Block is The MPEG2 TS PSI Independent Decodability Metrics Block is
identified by the constant <MTPID>. identified by the constant <MTPID>.
Reserved: 8 bits Reserved: 8 bits
These bits are reserved. They MUST be set to zero by senders These bits are reserved. They MUST be set to zero by senders and
ignored by receivers (See [RFC6709] section 4.2). ignored by receivers (See [RFC6709] section 4.2).
block length: 16 bits block length: 16 bits
The constant 11, in accordance with the definition of this field The constant 11, in accordance with the definition of this field
in Section 3 of RFC 3611. The block MUST be discarded if the in Section 3 of RFC 3611. The block MUST be discarded if the
block length is set to a different value. block length is set to a different value.
SSRC of source: 32 bits SSRC of source: 32 bits
As defined in Section 4.1 of RFC 3611. As defined in Section 4.1 of RFC 3611.
begin_seq: 16 bits begin_seq: 16 bits
As defined in Section 4.1 of RFC 3611. The RTP sequence number corresponding to the start of the
measurement period, as defined in Section 4.1 of RFC 3611.
end_seq: 16 bits end_seq: 16 bits
As defined in Section 4.1 of RFC 3611. The RTP sequence number corresponding to the end of the
measurement period, as defined in Section 4.1 of RFC 3611.
TS_sync_loss_count: 32 bits TS_sync_loss_count: 32 bits
Number of TS_sync_loss errors in the above sequence number A count of the number of TS_sync_loss errors that occurred in the
interval. It is calculated based on the occurrence of errors for above sequence number interval. A TS_sync_loss error occurs when
"TS_sync_loss"parameter defined in the section 5.2.1 of there are two or more consecutive incorrect sync bytes within the
[ETSI](Also see section 5.5.1 of [ETSI]). MPEG TS stream, as defined in section 5.2.1 of [ETSI].
Sync_byte_error_count: 32 bits Sync_byte_error_count: 32 bits
Number of sync_byte_errors in the above sequence number interval. A count of the number of Sync_byte_errors that occurred in the
It is calculated in the same way as TS_sync_loss_count, i.e.,based above sequence number interval. A sync byte error occurs when the
on the occurrence of errors for "Sync_byte_error"parameter defined sync byte is not equal to 0x47 in any TS packet contained in the
in the section 5.2.1 of [ETSI]. MPEG TS stream, as defined in section 5.2.1 of [ETSI].
Continuity_count_error_count: 32 bits Continuity_count_error_count: 32 bits
Number of Continuity_count_errors in the above sequence number A count of the number of Continuity_count_errors that occurred in
interval. Similarly, it is calculated based on the occurrence of the above sequence number interval. A Continuity_count_error
errors for "Continuity_count_error" parameter defined in the occurs when any of the following faults happen within the MPEG TS
section 5.2.1 of [ETSI]. stream - incorrect packet order, a packet occurs more than twice
or a packet is lost,as defined in the section 5.2.1 of [ETSI].
Transport_error_count: 32 bits Transport_error_count: 32 bits
Number of Transport_errors in the above sequence number interval. A count of the number of Transport_errors that occurred in the
Similarly, it is calculated based on the occurrence of errors for above sequence number interval. A Transport_error occurs when
"Transport_error" parameter defined in the section 5.2.2 of erroneous TS packet can not be corrected within the MPEG TS
[ETSI]. stream. as defined in the section 5.2.2 of [ETSI].
PCR_error_count: 32 bits PCR_error_count: 32 bits
Number of PCR_errors in the above sequence number interval. A count of the number of PCR_errors that occurred in the above
Similarly, it is calculated based on the occurrence of errors for sequence number interval. A PCR_error occurs if the primary clock
"PCR_error" parameter defined in the section 5.2.2 of [ETSI]. reference (PCR) is not seen for more than 100ms within the MPEG TS
stream, as defined in the section 5.2.2 of [ETSI]. The time
interval between two consecutive PCR values should be no more than
40ms.
PCR_repetition_error_count: 32 bits PCR_repetition_error_count: 32 bits
Number of PCR_repetition_errors in the above sequence number A count of the number of PCR_repetition_errors that occurred in
interval. Similarly, it is calculated based on the occurrence of the above sequence number interval. A PCR_repeition_error occurs
errors for "PCR_repetition_error" parameter defined in the section when the time interval between two consecutive PCR values is more
than 40ms within the MPEG TS stream,as defined in the section
5.2.2 of [ETSI]. 5.2.2 of [ETSI].
PCR_discontinuity_indicator_error_count: 32 bits PCR_discontinuity_indicator_error_count: 32 bits
Number of PCR_discontinuity_indicator_errors in the above sequence A count of the number of PCR_discontinuity_indicator_errors that
number interval. Similarly, it is calculated based on the occurred in the above sequence number interval. A
occurrence of errors for "PCR_discontinuity_indicator_error" PCR_discontinuity_indicator_error occurs if the time interval
parameter defined in the section 5.2.2 of [ETSI]. between two consecutive PCR values is more than 100ms within the
MPEG TS stream, as defined in the section 5.2.2 of [ETSI].
PCR_error_count: 32 bits PCR_accuracy_error_count: 32 bits
Number of PCR_accuracy_errors in the above sequence number A count of the Number of PCR_accuracy_errors that occurred in the
interval. Similarly, it is calculated based on the occurrence of above sequence number interval. A PCR_accuracy_error occurs when
errors for "PCR_accuracy_error" parameter defined in the section the PCR accuracy of the selected program is outside the range of
5.2.2 of [ETSI]. +/-500ns within the MPEG TS stream,as defined in the section 5.2.2
of [ETSI].
PTS_error_count: 32 bits PTS_error_count: 32 bits
Number of PTS_errors in the above sequence number interval. A count of the number of PTS_errors that occurred in the above
Similarly, it is calculated based on the occurrence of errors for sequence number interval. A PTS_error occurs when the PTS
"PTS_error" parameter defined in the section 5.2.2 of [ETSI]. repetition is more than 700ms within the MPEG TS stream, as
defined in the section 5.2.2 of[ETSI]. Note that the PTS is
contained in the MPEG-2 TS stream and is used to aid the decoder
in presenting the program on time, at the correct speed and
synchronized.
4. SDP Signaling 4. SDP Signaling
RFC 3611 defines the use of SDP (Session Description Protocol) RFC 3611 defines the use of SDP (Session Description Protocol)
[RFC4566] for signaling the use of RTCP XR blocks. However XR blocks [RFC4566] for signaling the use of RTCP XR blocks. However XR blocks
MAY be used without prior signaling (See section 5 of RFC3611). MAY be used without prior signaling (See section 5 of RFC3611).
4.1. SDP rtcp-xr-attrib Attribute Extension 4.1. SDP rtcp-xr-attrib Attribute Extension
This session augments the SDP attribute "rtcp-xr" defined in Section This session augments the SDP attribute "rtcp-xr" defined in Section
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Nanjing, JiangSu 210012 China Nanjing, JiangSu 210012 China
6. Security Considerations 6. Security Considerations
This proposed RTCP XR report block introduces no new security This proposed RTCP XR report block introduces no new security
considerations beyond those described in RFC 3611. considerations beyond those described in RFC 3611.
7. Acknowledgements 7. Acknowledgements
Thanks to Ray van Brandenburg, Claire Bi, Colin Perkin, Roni Even, Thanks to Ray van Brandenburg, Claire Bi, Colin Perkin, Roni Even,
Dan Romascanu and Ali Begen for useful review and suggestions. Dan Romascanu, Ali Begen and Alan Clark for useful review and
suggestions.
8. References 8. References
8.1. Normative References 8.1. Normative References
[ETSI] ETSI, "Digital Video Broadcasting (DVB); Measurement [ETSI] ETSI, "Digital Video Broadcasting (DVB); Measurement
guidelines for DVB systems", Technical Report TR 101 290, guidelines for DVB systems", Technical Report TR 101 290,
2001. 2001.
[RFC2119] Bradner, S., "Key words for use in RFCs to Indicate [RFC2119] Bradner, S., "Key words for use in RFCs to Indicate
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ISO International Standard 13818-1, October 2007. ISO International Standard 13818-1, October 2007.
[RFC6390] Clark, A. and B. Claise, "Guidelines for Considering New [RFC6390] Clark, A. and B. Claise, "Guidelines for Considering New
Performance Metric Development", BCP 170, RFC 6390, Performance Metric Development", BCP 170, RFC 6390,
October 2011. October 2011.
[RFC6709] Carpenter, B., Aboba, B., and S. Cheshire, "Design [RFC6709] Carpenter, B., Aboba, B., and S. Cheshire, "Design
Considerations for Protocol Extensions", RFC 6709, Considerations for Protocol Extensions", RFC 6709,
September 2012. September 2012.
[RFC6776] Wu, Q., "Measurement Identity and information Reporting
using SDES item and XR Block", RFC 6776, August 2012.
[RFC6792] Wu, Q., Hunt, G., and P. Arden, "Guidelines for Use of the [RFC6792] Wu, Q., Hunt, G., and P. Arden, "Guidelines for Use of the
RTP Monitoring Framework", RFC 6792, November 2012. RTP Monitoring Framework", RFC 6792, November 2012.
Authors' Addresses Authors' Addresses
Rachel Huang Rachel Huang
Huawei Huawei
101 Software Avenue, Yuhua District 101 Software Avenue, Yuhua District
Nanjing 210012 Nanjing 210012
China China
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