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Buffer Handling Media Attribute in SDP for Seamless Session Mobility

Buffer Handling Media Attribute in SDP for Seamless Session Mobility . draft-mingqiang-mmusic-session-mobility-attribute-00.txt. Matsushita Electric (Panasonic) ：. Xu Mingqiang Daisaku Komiya Sachiko Kawaguchi Mahfuzur Rahman Brijesh Kumar. Overview.

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Buffer Handling Media Attribute in SDP for Seamless Session Mobility

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  1. Buffer Handling Media Attribute in SDP for Seamless Session Mobility draft-mingqiang-mmusic-session-mobility-attribute-00.txt Matsushita Electric (Panasonic)： Xu Mingqiang Daisaku Komiya Sachiko Kawaguchi Mahfuzur Rahman Brijesh Kumar

  2. Overview • Requirements for seamless session mobility for video on demand • Proposed media handling approach • Possible protocol extension for the media handling approach • Open issues, Next steps

  3. About Session Mobility • Session mobility: A mechanism that allows a user to transfer an ongoing communication session from one device to another device • Seamless session mobility (SSM): • ・ Minimum media disruption • ・ Instant media transfer CN Internet 3G WLAN PC

  4. Session Mobility for VOD • Target Application:VOD • Characteristics of VOD ・ Data buffering is required in streaming clients for continuous playback ・ Playback delay is caused by filling the buffer to a desired level What happens during session transfer for VOD ? Media Server Internet 3G WLAN TV

  5. Session Mobility Using REFER for VOD ・Playback delay in the selected device will be perceived by user A B Media Server Session /Media stream Start session transfer Refer Invite (To establish a session) Delay perceived by user Media stream Start sending media Start receiving and buffering media Delay taken for buffering ～ ～ Start displaying media Notify Bye

  6. Requirements for SSM for VOD • What happened during session transfer for VOD ・ Data buffering will be started in the selected device ・ Buffering time will be perceived by user Delay perceived by user = Session setup delay + Buffering time • Requirement for SSM for VOD: • Need to eliminate the buffering time so that • user can feel media is transferred instantly

  7. Proposed Media Handling for Seamless Session Mobility Forward media from A to B directly before starting session transfer Media Server A B Need to indicate that the media is just for buffering in Invite. Session /Media stream Invite (Buffer Only) Invite Start forwarding media Start receiving and buffering media Start session transfer Delay perceived by user Re-invite Start displaying media Refer Invite (To establish a session) Sending media to B Receiving media from CN Bye

  8. Possible Protocol Extensions for Media Handling • Choice 1: SDP Define a new SDP property attribute : Attribute Name: a=bufferonly • Choice 2: SIP • Define a new option-tag : Option-tag Name: bufferonly • Define a new media feature tag : Media feature tag name: mediahandling=“bufferonly”

  9. Performance ・Experiment Environment Media Server Internet LAN A B ・Experiment Results

  10. Seamless Session Mobility in IETF • Shacham’s draft for session mobility Title: Session Initiation Protocol (SIP) Session Mobility (draft-shacham-sipping-session-mobility-01.txt) • Relation with Shacham’s draft • Seamless is proposed as a requirement for session mobility • Estimated total transfer delay should not be much longer than 1s • Targeting for the applications with long buffering time • Complementary to Shacham’s draft

  11. Open Issues • Other use cases for the proposed extension ? • Where to put the proposed extension, SDP or SIP ?

  12. Next Steps • Add media synchronization section • Make clear the targeted application as VOD • Add a performance section

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