Media Stream Selection - PowerPoint PPT Presentation

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Media Stream Selection

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Title: Media Stream Selection


1
Media Stream Selection
  • draft-westerlund-dispatch-stream-selection-00
  • draft-westerlund-avtext-rtp-stream-pause-00
  • Bo Burman ltbo.burman_at_ericsson.comgt

2
IPR Disclosure
  • For referred drafts
  • http//datatracker.ietf.org/ipr/1641/
  • http//datatracker.ietf.org/ipr/1644/

3
Discussion Goals
  • Solution for RTP Media Stream Selection can be
    based on one or more of three signaling types
  • Signaling plane only
  • Media control overlay
  • Media plane only
  • Ideally decide targeted solution and WG(s) during
    IETF 83

4
Main Topologies
  • Centralized (Star) Conference
  • Point-to-Point Call

A
C
Conf
B
D
A
B
Video conferencing is main targeted application
5
Wanted Functionality
  • Choose What Content to Receive
  • A media receiver wants to dynamically choose
    which media stream to receive, out of many
    possible, from a certain media sender, out of
    many possible
  • Request to Pause Sending of a Content
  • A media receiver wants to ask the media sender to
    temporarily stop sending a specific media stream,
    and to resume it with short notice

6
Relation to SDP
  • SDP handles semi-static properties of RTP
    transport flows
  • Opening
  • Closing
  • Directionality
  • Activating
  • Inactivating

7
Choose What Content to Receive
Sender 1
Sender 2
  • Whenever there are more media streams from all
    senders than what can be presented simultaneously
    by a single receiver, some subset has to be
    selected
  • The receiver has commonly not been in charge of
    that selection
  • Multi-stream capable receivers making local
    composition will not burden central composition
    by multiple different choices

1
1
3
3
2
2
CentralConferenceNode
I want Sender 1 2 here
Always give me Sender 2 3
Never send Sender 1 1
Receiver
8
Request to Pause Sending of a Content
Sender
I dont need your stream 1 right now
  • Whenever there are more media senders than
    presentation resources, some media may not be
    presented by any receiver, wasting uplink
    bandwidth
  • Applicable also in other multi-party or
    multi-stream situations
  • Need for a stream can be based on central
    forwarding decisions or end-user UI interactions
    and thus be highly dynamic
  • Pausing has fairly relaxed timing, but resuming
    can be time critical

1
3
2

Resume stream 3 now
CentralConferenceNode
I dont need this stream right now
Receiver
Receiver
9
Assumed Signaling System
  • Different Topology than the media plane
  • Has Application Server (AS) to handle application
    session signaling, especially for multi-party
  • Any solution must work with service established
    by SIP/SDP signaling

AS
SIPProxy
SIPProxy
MediaServer
Alice
Bob
10
Three Possible Solutions 1
  • Media Control Overlay
  • Pros
  • Protocol tailored for need
  • Bandwidth efficient
  • Need only be processed in nodes that are actually
    involved in functionality
  • Possible re-use of permission handling (for BFCP)
  • Cons
  • Need control as an extra media stream and (at
    least semi-reliable) transport for it

AS
SIPProxy
SIPProxy
MediaServer
Alice
Bob
11
Three Possible Solutions 2
  • Media Plane
  • Pros
  • Bandwidth efficient
  • Implementation well localized to media stream
    handling
  • Cons
  • Need to traverse every node in the media path
    until reaching targeted node
  • May not have sufficient identification
    information without being complemented by other
    signaling

AS
SIPProxy
SIPProxy
MediaServer
Alice
Bob
12
Three Possible Solutions 3
  • Signaling Plane
  • Pros
  • Likely connected to overall resource reservation
  • Has access to conference meta information, like
    identification
  • Cons
  • Risk being too slow for sufficiently good user
    experience
  • Every message potentially has to be processed by
    policy control nodes etc
  • Likely rather large amount of data needed per
    message

AS
SIPProxy
SIPProxy
MediaServer
Alice
Bob
13
Which Method(s) to Choose?
  • Media Control Overlay
  • Media Plane
  • Signaling Plane
  • Combination
  • NOTE Choice will impact in which WG work is done

14
Possible Destination WGs
  • May require re-charter
  • Media Control Overlay
  • BFCPBIS
  • MEDIACTRL
  • Media Plane
  • AVTCORE
  • AVTEXT
  • Signaling Plane
  • MMUSIC
  • New WG
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