ShinGak Kang

1
Multicast Standardization of ITU-T Q.1/17 and
Cooperation with ITU-T FG IPTV

• Shin-Gak Kang
• sgkang_at_etri.re.kr

2
Background

• Multicast is one of the Key Component of IPTV
  Service
• Various Activities on Multicast Communications
  within ITU-T
• Cooperative and Coordinative Work is required
  among related Groups
• Protocol Solutions on Multicast are required for
  IPTV Service
• Possible Cooperation and Coordination ?

3
Multicast Standardization Activities

• FG IPTV
• Multicast Requirements of IPTV Service
• High Level Requirements
• Detail Functional Requirements
• ITU-T SG 13 Q.2/13, Q.3/13
• NGN Multicast Requirements
• NGN Multicast Service Framework
• NGN Multicast Functional Architecture
• ITU-T SG 17 Q.1/17
• End-to-end Multicast Communications Protocols
• Enhanced Communications Transport Protocol (ECTP)
• Relayed Multicast Protocol (RMCP)

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ITU-T SG 17

• ITU-T SG 17 Security, Languages and
  Telecommunication Software
• Responsible for studies relating to
• security, the application of open system
  communications including networking and
  directory, and for technical languages, the
  method for their usage and other issues related
  to the software aspects of telecommunication
  systems
• Working Party 1/17 Open Systems Technology
• Question 1 End-to-end Multicast Communications
  with QoS Managing Facility
• Working Party 2/17 Telecommunication Security
• Working Party 3/17 Languages and
  Telecommunications Software

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Motivation of ITU-T Q.1/17

• emerging multimedia applications require various
  functions and facilities
• the end-to-end multicast functions is one of the
  key features of the multimedia applications
• it is required to have a capability to manage QoS
  features for providing enhanced communication
  services to the end user
• Considering IP multicast network environments as
  well as existing IP network environments, where
  the IP Multicast facility is not fully supported
  in network
• developing Recommendations in collaborative
  manner with ISO/IEC JTC 1/SC 6 for adopting as a
  common standards

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Objectives of ITU-T Q.1/17

• Maintenance and enhancements of existing
  Recommendations X.601, X.605, X.606, X.606.1,
  X.602, X.603 for accepting new market
  requirements (if needed)
• Produce new Recommendations on Duplex multicast
  transport protocol with QoS managing facilities
• Produce new Recommendations on N-plex multicast
  transport protocol with QoS managing facilities
• Produce new Recommendations on end-to-end relayed
  multicast protocol for simplex group applications
• Produce new Recommendations on end-to-end relayed
  multicast protocol for N-plex group applications
• Produce new Recommendations on end-to-end
  multicast protocol over wireless network
• Collaborative work with ISO/IEC JTC 1/SC 6 on
  multicast related issues

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Major Work Items

• Multicast Communications General
• Multi-Peer Communications Framework
• Group Management Protocol
• Enhanced Communications Transport
  Service/Protocol
• Designed for end-to-end data delivery over IP
  network environments where IP multicast facility
  is fully deployed in the Router
• Provide group membership management functions for
  reasonable number of group members
• Provide simple QoS management functions such as
  data transmission rate adjustment based on
  Throughput, Data loss rate, etc.
• Applicable to multicast applications such as
  reliable data distribution, real-time
  broadcasting service for the small size of group
  members
• Considering different type of Multicast data
  delivery
• One-to-Many, Many-to-One, Many-to-Many

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Major Work Items

• Relayed Multicast Protocol (RMCP)
• Designed for end-to-end data delivery over IP
  network environments where IP multicast facility
  is not fully deployed in the Router
• Using alternative ways of IP Multicast, which is
  Overlay Multicast Mechanism
• One of Application-Layer Protocol based on
  Relayed Multicast Mechanism
• Each End Hosts or Special Devices emulate the IP
  forwarding mechanism like multicast router
• Applicable to multicast applications such as
  reliable data distribution, real-time
  broadcasting service for the large size of group
  members (i.e. provide relatively high
  scalability)
• Considering different type of Multicast data
  delivery
• Simplex Multicast Delivery (One-to-Many)
• N-plex Multicast Delivery (Many-to-Many)

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Deliverables of ITU-T Q.1/17

• Developed Recommendations
• ITU-T Recommendation X.601(2000), Information
  technology Multi-Peer Communications Framework
• ITU-T Recommendation X.605(1998) ISO/IEC
  132521999, Information technology Enhanced
  Communications Transport Service Definition
• Multicast Transport Service Definitions for
  Multicast Transport Protocol, ECTP
• ITU-T Recommendation X.602(2004) ISO/IEC
  165132005, Information technology Group
  Management Protocol
• Group Membership Creation, Deletion, etc.

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Deliverables of ITU-T Q.1/17

• Developed Recommendations (Continue)
• ITU-T Recommendation X.606(2001) ISO/IEC
  14476-12002, Information technology Enhanced
  Communications Transport Protocol (ECTP)
  Specification of Simplex Multicast Transport
• Designed for end-to-end data delivery over IP
  network environments where IP multicast facility
  is fully deployed in the Router
• Developed for one-to-many reliable data
  transmission
• Can be used for bulk data distribution, etc.
• ITU-T Recommendation X.606.1(2003) ISO/IEC
  14476-22003, Information technology Enhanced
  Communications Transport Protocol (ECTP)
  Specification of QoS Management for Simplex
  Multicast Transport
• Developed for one-to-many real-time data
  transmission
• Can be used for live broadcasting applications of
  multimedia data including Video

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Deliverables of ITU-T Q.1/17

• Developed Recommendations (Continue)
• ITU-T Recommendation X.603(2004) ISO/IEC
  16512-12005, Information technology Relayed
  Multicast Protocol (RMCP) Framework
• Recommendations under AAP
• ITU-T Draft Rec. X.607 ISO/IEC CD 14476-3, ECTP
  Specification of Duplex Multicast Transport
• Many-to-One Reliable Data Delivery
• ITU-T Draft Rec. X.608 ISO/IEC CD 14476-5, ECTP
  Specification of N-plex Multicast Transport
• Many-to-Many Reliable Data Delivery
• ITU-T Draft Rec. X.603.1 ISO/IEC FCD 16512-1,
  Information technology Relayed Multicast
  Protocol (RMCP) Specification for simplex group
  applications
• One-to-Many Data Delivery (Reliable and Real-time)

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Deliverables of ITU-T Q.1/17

• Current related Work Program on End-to-end
  Multicast
• ITU-T Draft Rec. X.603.2 ISO/IEC CD 16512-3,
  Information technology Relayed Multicast
  Protocol (RMCP) Specification for N-plex group
  applications
• Many-to-Many Data Delivery (Reliable and
  Real-time)
• New Work Items on Mobile Multicast Communications
• Initial Stage in SG 17 and JTC1/SC6
• ITU-T Draft Rec. X.mrmcp-1 Mobile Multicast
  Communications Framework
• ITU-T Draft Rec. X.mrmcp-2 Mobile Multicast
  Communications Specification for N-plex group
  applications

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Considerations

• ITU-T FG IPTV Meeting (Jan. 2007)
• Discussions on Work Scope and Relationship among
  relevant Groups on Multicast Issues
• FG IPTV Focused on Multicast Issues for IPTV
  Service in Non-NGN Environments
• Development of Multicast Solution is out of scope
  of FG IPTV
• ITU-T Q.1/17
• Developing Multicast Protocols in Non-NGN
  environments
• Especially, Relayed Multicast Protocol can be
  candidate solutions for IPTV Service
• Future Plan
• Gap Analysis between IPTV Multicast Requirements
  and ITU-T Rec. X.603.1 ISO/IEC 16512-1 (RMCP-2)

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Proposal

• Harmonized Standardization Works of CJK Members
  on Multicast Issues within ITU-T
• ITU-T SG 13 Focusing on NGN Multicast
• Q.2/13 NGN Multicast Service Framework
• Q.3/13 Functional Architecture for NGN
  Multicast
• ITU-T FG IPTV Focusing on Non-NGN Multicast
• WG1 High Level Multicast Requirements
• WG4 Network and Control Aspects of Multicast
• ITU-T SG 17 Focusing on Non-NGN Multicast
  Solutions
• Q.1/17 Overlay Multicast Solutions
• Further Considerations of Applicability of
  Overlay Multicast Solutions of SG 17(RMCP) to
  IPTV Service

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Appendix Implementation status

• ETRI is developing RMCP-2 and its Applications
  for Windows environment as well as Linux
• Domestic and International Testing over Research
  Network

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RMCP-2 Implementation

• Linux-based RMCP-2 Implementations

MA Interface
sm Interface
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RMCP-2 Implementation

• Windows-based RMCP-2 Implementations

MA Interface
sm Interface
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Test RMCP-2

• High-bandwidth Testbed

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Test RMCP-2

• DVD Quality Multicast Source

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Test RMCP-2

• HDTV Quality Multicast Source

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Test RMCP-2

• Korea-Vietnam Testbed

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Test RMCP-2

• SDTV Quality

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• Q A