Internet DRAFT - draft-xia-xrblock-rtcp-xr-layered-statistics
draft-xia-xrblock-rtcp-xr-layered-statistics
Network Working Group J. Xia
Internet-Draft Huawei
Intended status: Standards Track G. Zorn
Expires: March 18, 2012 Network Zen
Q. Wu
Huawei
R. Schott
Deutsche Telekom
September 15, 2011
RTCP XR Blocks for layered Stream statistics metric reporting
draft-xia-xrblock-rtcp-xr-layered-statistics-01
Abstract
This document defines an RTCP XR Report Block and associated SDP
parameters that allow the reporting of layered stream statistics
metrics for use in a range of RTP applications.
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Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . 3
2. Terminology . . . . . . . . . . . . . . . . . . . . . . . . . . 3
2.1. Standards Language . . . . . . . . . . . . . . . . . . . . 3
3. Applicability . . . . . . . . . . . . . . . . . . . . . . . . . 3
4. Layered Streams Statistics Metrics Block . . . . . . . . . . . 3
4.1. Metric Block Structure . . . . . . . . . . . . . . . . . . 4
4.2. Definition of Fields in layered stream statistics
Metrics Block . . . . . . . . . . . . . . . . . . . . . . . 4
5. SDP Signaling . . . . . . . . . . . . . . . . . . . . . . . . . 5
6. IANA Considerations . . . . . . . . . . . . . . . . . . . . . . 6
7. Security Considerations . . . . . . . . . . . . . . . . . . . . 6
8. Acknowledgements . . . . . . . . . . . . . . . . . . . . . . . 6
9. References . . . . . . . . . . . . . . . . . . . . . . . . . . 7
9.1. Normative References . . . . . . . . . . . . . . . . . . . 7
9.2. Informative References . . . . . . . . . . . . . . . . . . 7
Appendix A. Change Log . . . . . . . . . . . . . . . . . . . . . . 7
A.1. draft-xia-xrblock-rtcp-xr-layered-statistics-01 . . . . . . 7
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . . 7
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1. Introduction
This draft defines a new block type to augment those defined in
[RFC3611], for use in a range of RTP applications.
The new block type provides layered streams statistics beyond the
information carried in the Statistics Summary Report Block RTCP
packet specified in the section 4.6 of RFC 3611 [RFC3611].
Information is recorded about lost layered component packets,
duplicated layered component packets.
The metrics belong to the class of transport level metrics defined in
[MONARCH] (work in progress).
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:
Layered Component Packet
a RTP packet using layered codecs containing the specified layered
component, e.g., encoded stream at the base layer or at the
enhancement layer.
3. Applicability
Layered Streams Statistics Metrics Block can be applied to any real
time applications that use layered or multi-description video coding.
4. Layered Streams Statistics Metrics Block
Metrics in this block report on lost packets, duplicated packets in
the layered stream arriving at the RTP system.
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4.1. Metric Block Structure
The report block contents are dependent upon a series of flag bits
carried in the first part of the header. Not all parameters need to
be reported in each block. Flags indicate which are and which are
not reported. The fields corresponding to unreported parameters MUST
be present, but are set to zero. The receiver MUST ignore any
Perceptual Quality Metrics Block with a non-zero value in any field
flagged as unreported.
The Layered Stream Statistics 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 |I|T|D| rsd. | block length |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| SSRC of source |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| begin_seq | end_seq |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Lost_Layered Component Packets |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Dup Layered Component_Packets |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
4.2. Definition of Fields in layered stream statistics Metrics Block
Block type (BT): 8 bits
The Layered stream Statistics Metrics Block is identified by the
constant <LSSM>.
Interval Metric flag (I): 1 bit
This field is used to indicate whether the Basic Loss/Discard
metrics are Interval or Cumulative metrics, that is, whether the
reported values applies to the most recent measurement interval
duration between successive metrics reports (I=1) (the Interval
Duration) or to the accumulation period characteristic of
cumulative measurements (I=0) (the Cumulative Duration).
Layer Type flag (T): 1 bit
This field is used to indicate the Layer Type of layered video to
be reported. LT is set to 0 if the loss_component_packet field
and dup_component packet contain the base layer packet in layered
codecs,e.g, SVC in [RFC6190], 1 if the loss_component packet field
and dup_component packet contain enhancement layer packet in
layered codec.
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Layer Dependency (D): 1 bit
This field is used to indicate the layer dependency between
different enhancement layers if there is more than one enhancement
layers. D is set to 0 if there is no layer dependency between
different enhancement layers, 1 if there is layer dependency
between different enhancement layers.
Rsd.: 5 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 3, in accordance with the definition of this field in
Section 3 of RFC 3611 [RFC3611].
begin_seq: 16 bits
As defined in Section 4.1 of RFC 3611 [RFC3611].
end_seq: 16 bits
As defined in Section 4.1 of RFC 3611 [RFC3611].
Lost_Layered Component Packets: 32 bits
Number of lost_component packets in the above sequence number
interval.
Dup_Layered Component Packets: 32 bits
Number of dup_component packets in the above sequence number
interval.
5. 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 = layered-stream-stat-metrics
layered-stream-stat-metrics = "layered-stream-stat-metrics"
["=" stat-flag *("," stat-flag)]
stat-flag = "base layer packet"
/ "enhancment layer packet"
Refer to Section 5.1 of RFC 3611 [RFC3611] for a detailed description
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and the full syntax of the "rtcp-xr" attribute.
6. IANA Considerations
New report block type for RTCP XR is 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:
Name: LSSM
Long Name: Layered Stream Statistics Metrics
Value <LSSM>
Reference: Section 4
This document also registers one new SDP [RFC4566] parameter for the
"rtcp-xr" attribute in the RTCP XR SDP Parameters Registry:
* "layered-stream-stat-metrics"
The contact information for the registrations is:
Qin Wu
sunseawq@huawei.com
101 Software Avenue, Yuhua District
Nanjing, JiangSu 210012 China
7. Security Considerations
The new RTCP XR report blocks proposed in this document introduces no
new security considerations beyond those described in [RFC3611].
8. Acknowledgements
The authors would like to thank Bill Ver Steeg, David R Oran, Ali
Begen,Colin Perkins, Roni Even,Youqing Yang, Wenxiao Yu and Yinliang
Hu for their valuable comments and suggestions on this document.
9. References
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9.1. Normative References
[RFC2119] Bradner, S., "Key words for use in RFCs to Indicate
Requirement Levels", BCP 14, RFC 2119, March 1997.
[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.
[RFC6190] Wenger, S., Wang, Y., Schierl, T., and A. Eleftheriadis,
"RTP Payload Format for Scalable Video Coding", RFC 6190,
May 2011.
9.2. Informative References
[MONARCH] Wu, Q., "Monitoring Architectures for RTP",
ID draft-ietf-avtcore-monarch-00, April 2011.
Appendix A. Change Log
A.1. draft-xia-xrblock-rtcp-xr-layered-statistics-01
The following are the major changes compared to previous version 00:
o Add the layer dependency field in the format of this metric block.
o Clear unused references.
o Other Editorial changes.
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Authors' Addresses
Jinwei Xia
Huawei
101 Software Avenue, Yuhua District
Nanjing, Jiangsu 210012
China
Email: xiajinwei@huawei.com
Glen Zorn
Network Zen
77/440 Soi Phoomjit, Rama IV Road
Phra Khanong, Khlong Toie
Bangkok 10110
Thailand
Phone: +66 (0) 87 502 4274
Email: gwz@net-zen.net
Qin Wu
Huawei
101 Software Avenue, Yuhua District
Nanjing, Jiangsu 210012
China
Email: sunseawq@huawei.com
Roland Schott
Deutsche Telekom
Deutsche-Telekom-Allee 7
Darmstadt 64295
Germany
Email: Roland.Schott@telekom.de
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