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Liaison statement
Liaison Statement on Webpush for DASH

Additional information about IETF liaison relationships is available on the IETF webpage and the Internet Architecture Board liaison webpage.
State Posted
Submitted Date 2014-11-03
From Group ISO-IEC-JTC1-SC29-WG11
From Contact Shinji Watanabe
To Group webpush
To Contacts Joe Hildebrand <>
Shida Schubert <>
Cc Richard Barnes <>
Alissa Cooper <>
Stephan Wenger <>
Purpose For comment
Deadline 2015-02-09 Action Needed
Attachments Liaison Statement on Webpush for DASH
MPEG would like to inform IETF about its MPEG-DASH’s FDH core experiment (CE)
and receive IETF’s Webpush Working Groups’ feedback on the following subject.

Full Duplex HTTP (FDH) CE is tackling the problem of delivering media segments
with shorter delay and/or reducing the request processing on the HTTP server.
The technologies considered are HTTP/2 and WebSockets. The main idea is that
once a client is interested in streaming a particular content (e.g., a live
channel), it may be beneficial not to send periodic individual GET requests for
each segment to the server network. The server network may keep sending
segments once they become available to the client for a predetermined amount of
time or until the client tells the server to stop. Note that not all clients
streaming the same content will necessarily use the “push” feature. Some may
continue fetching each segment separately, some may ask for push of the several
next segments or some may ask for push till a further command.

The FDH core experiment’s description is included in the attached document to
provide more detailed information.

We would like to ask you to consider media delivery use cases as part of your
webpush activity.We would also like to ask for your opinion on the choice of
protocols and the related best practices.

Some MPEG experts are expected to participate in the next meeting (IETF 91 in
Honolulu) and provide more detail and MPEG welcomes IETF’s collaborations on
the subject.

Our future meetings:
- DASH Ad-hoc meeting, 15 February 2015, Geneva
- The 111th MPEG meeting, 16-20 February 2015, Geneva