Immersive Media Delivery and Access Grid

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lt lab. seminargt
59th IETF Meeting Report Seoul, South Korea
February 29-March 4, 2004 SIP, SIPPING, AVT, IP
over DVB
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Contents

• Background Internet Media Delivery Protocols
• WGs
• Session Initiation Protocol (SIP) WG
• Session Initiation Proposal Investigation
  (SIPPING) WG
• Audio/Video Transport (AVT) WG
• IP over DVB WG
• Epilog

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Internet Media Delivery Protocols
Shared Tools
Conference Control
Media Contents
AVT WG
SIP related WGs (sip, sipping, simple)
RTP Payload
SDP
RTCP
SIP
SAP
HTTP
H.323
RTSP
SMTP
RSVP
RTP
Security Protocols
UDP
TCP
IPv4, IPv6
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Session Initiation Protocol WG (1/2)

• SIP Overview
• Initiating interactive communication session
• Components
• User agent system UAC, UAS
• Network server Proxy Server, Redirect Server
• Register, Location server

• Proxy Mode Operation

• Redirect Mode Operation

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Session Initiation Protocol WG (2/2)

• SIP WG Overview
• First development within MMUSIC WG
• Objectives
• To continue the development of SIP (Based on
  RFC2543)
• Specification Extension of SIP
• Respond to general-purpose requirements for
  changes to SIP by other WG, (e.g., SIPPING)
• In this IETF meeting
• 11 drafts were presented (7 issues)
• Request history, VoiceMail URIs, Wrapping up MIME
  Body Part Usage
• Policy URI and Purpose, Authentication Issues
• Non-Invite Transactions, GRUU and Device ID
  Mechanisms

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Session Initiation Proposal Investigation WG (1/3)

• SIPPING WG Overview
• Objectives
• The use of SIP for several applications
• Requirements for any extensions to SIP
  applications
• Specific tasks
• PSTN and 3G telephony-equivalent applications
• Messaging-like applications of SIP
• Multi-party applications of SIP
• SIP calling to media servers
• Related other groups
• SIP, IPTEL (IP Telephony)
• SIMPLE, AAA(Authentication, Authorization and
  Accounting)
• MMUSIC (Multiparty Multimedia Session Control)
• Distributed Call Signaling (DCS)

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Session Initiation Proposal Investigation WG (2/3)

• In this IETF meeting
• 35 drafts were presented (18 issues)
• Event Package for Configuration Profiles, Session
  Policies
• The dialog package, End-to-Middle Security
• Real-Time Text Conversation Using SIP
• QSIG SIP Call Transfer, S/MIME Certificates in
  SIP
• KPML, Basic Network Media Services with SIP
• Instance ID, GRID, GRUU, Resource ID Requirements
• Application Interaction
• SIP Conferencing, Transcoding, SIP Emergency
• Location Conveyance Requirements, REFER
  Extensions
• Exploders, RTCP Summary Report Event Package

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Session Initiation Proposal Investigation WG (3/3)

• End-to-Middle Security (draft-hilt-sipping-e2m-se
  c-reqs-01.txt)
• Motivation The UA might want to protect the
  message bodies and/or headers from proxy servers
  excluding the particular proxy that provides
  some services based on their content
• Mechanism for securing information passed between
  the UA and an intermediary proxy
• End-to-middle security

• Deployment Example

Home network
User 1
User 2
C
C

C
UA 1
Proxy 1
Proxy 2
UA 2
C Content that UA 1 needs to disclose
Content that UA 1 needs to protect
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Audio/Video Transport WG (1/2)

• AVT Overview
• Protocol for real-time transmission of audio and
  video over unicast and multicast UDP/IP -gt
  Real-time Transport Protocol (RTP)
• AVT WG Overview
• To advance the main RTP spec and profile
• To review and revise existing payload formats
• To develop payload formats for new media codecs
• FEC work, To extend RTCP,
• Combination of the SRTP profile

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Audio/Video Transport WG (2/2)

• In this IETF meeting
• 13 drafts were drafted ( 9 issues)
• RTP payload format for AMR-WB audio codec
• Introduction of ATRAC family payload format, 3GPP
  Timed Text
• Payload format for text conversation
• H.261 and H.263 parameters
• RTCP Extensions for SSM Sessions with Unicast
  Feedback
• Requirements for ECRTP over MPLS
• Verifying the media path using RTP No-Op
  Preconditions
• RTP Profile for TCP Friendly Rate Control
• RTCP Extensions for SSM Sessions with Unicast
  Feedback
• Scenarios
• SSM groups with a single sender, One-to-many
  broadcast networks.
• ASM with a single sender
• Basic operation
• Simple Feedback Model, Sender Feedback Summary
  Model

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IP over DVB WG

• Description
• Better deployment of IP over MPEG-2 transport and
  provide easier inter working with IP networks
• Link-layer support for unicast and multicast,
  large numbers of down-stream receivers, and
  efficiency of transmission
• Focus
• MPEG-2 transport include Digital Video Broadcast
  (DVB) standards
• Ultra Lightweight Encapsulation (ULE) for
  transmission of IP datagrams over MPEG-2/DVB
  networks
• First Internet draft. March 2004

PDU (e.g., IP datagram)
TS packet
Subnetwork Data Unit (SNDU)
Encapsulator
TS packet
TS packet

• Basic Processing

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Epilog

• I got more interesting about IETF through this
  meeting
• Internet standard processing
• I was impressed with discussion culture

• I remember some IETF engineers