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Liaison statement
LS to IETF AVTEXT on Video Region-of-Interest (ROI)

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State Posted
Submitted Date 2015-11-16
From Group 3GPP-TSGSA-SA4
From Contact Ozgur Oyman
To Group avtext
To Contacts Keith Drage <>
Jonathan Lennox <>
Cc Barry Leiba <>
Ben Campbell <>
Alissa Cooper <>
Audio/Video Transport Extensions Discussion List <>
Jonathan Lennox <>
Rachel Huang <>
Response Contact
Purpose For action
Deadline 2016-01-25 Action Needed
Attachments S4-151302
1. Overall Description:
In an earlier liaison statement, 3GPP SA4 informed IETF AVTEXT regarding the
Video Region-of-Interest (ROI) signaling framework adopted in 3GPP TS 26.114.
Since then, we have recently updated the ROI specification in TS 26.114 with
the following:

•Clarification of the requirements on ‘Sent ROI’ signaling mandating its offer
when ‘Arbitrary ROI’ and/or ‘Pre-defined ROI’ are negotiated, and
recommendation of its offer when ‘FECC’ is negotiated.

•Definition of separate URNs for RTP header extensions corresponding to
arbitrary ROI and predefined ROI signaling for the ‘Sent ROI’ mode.

•Clarification of the SDP offer-answer procedures for the ‘a=predefined_ROI’

•Description of guidelines on the handling of concurrent ROI requests, e.g.,
during multi-party conferences

•Clarification of the definition of ROI information parameters and ROI usage in
transcoding scenarios.

•Inclusion of SDP examples demonstrating the offer-answer procedures for FECC,
‘Arbitrary ROI’, ‘Pre-defined ROI’ and ‘Sent ROI’

The latest version of 3GPP TS 26.114 v13.1.0 containing these updates can be
found in the attached.

2. Actions:
3GPP SA4 kindly requests IETF AVTEXT to take the information above into
account, and maintain coordination with SA4 during the course of the
development of draft-huang-avtext-feedback-image-control-00 toward ensuring the
alignment between 3GPP and IETF specifications.

3. Date of Upcoming TSG-SA WG4 Meetings:
TSG SA WG4 Meeting #87  25 - 29 Jan 2016        Venue: Sophia Antipolis, France
TSG SA WG4 Meeting #88  18 - 22 Apr 2016                Venue: USA