HNTF/Home Network TF Discussions/ServiceMigration/comments gp1

From Web and TV IG

Service Migration

Submitter: Jean-Claude Dufourd, Telecom ParisTech

Tracker Issue ID: ISSUE-7

Description: A service moving across devices: e.g. I start using my phone for the user interface to a device, then my tablet becomes available, so I move the interface service to the tablet.

Implementation: Possible implementation on top of UPnP:

  • I start using my phone as a UI of a service on my TV, e.g. EPG, but the screen is small.
  • My tablet finally becomes available.
  • I request the migration of the current document (user agent function).
  • The user agent discovers its peers on the network, i.e. other user agents capable of running the current document.
  • The user agent proposes to me a list of suitable user agents, including the one running on the tablet.
  • I choose the user agent running on the tablet
  • The UA on the phone binds to the UA on the tablet, and sends a migration message with the URL of the document, and the URL of the execution state.
  • The UA on the tablet receives the migration message, fetches the document and the execution state, loads both.
  • The UA on the tablet signals to the UA on the phone that migration is complete, by replying "success" to the migration message.
  • The UA on the phone stops rendering the migrated document.
  • I pick up the tablet and go on with the service at the point I left it on the phone.

Justification:

Dependencies: None

Comments:

This UC4 asks the questions: how do we move a service and its current "state" to another device ? what is the "state" ?

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