The Vault

Demonstration of Seamless Multimedia Session Transfer to Support Pervasive Mobile Computing
Research Paper / Jan 2010

978-1-4244-7265-9/10/$26.00 © 2010 IEEE

Demonstration of Seamless Multimedia Session
Transfer to Support Pervasive Mobile Computing

Robert G. Gazda and Debashish Purkayastha
InterDigital, LLC

781 Third Ave
King of Prussia, PA 19406, USA

robert.gazda@interdigital.com
debashish.purkayastha@interdigital.com



Xin Feng and Farshad A. Samimi
GoldSpot Media, Inc.

530 Lakeside Drive, Suite #110
Sunnyvale, CA 94085, USA

xin@goldspotmedia.com
farshad@goldspotmedia.com



Extended Abstract— In today’s media environment, multimedia
content is accessed by mobile users in a silo fashion, with content
locked to individual point devices and networks. Content, available
on one device or one network, may not be accessed from other
devices, or over other networks. Users cannot easily share
multimedia sessions across devices, such as smartphones and laptops.
Media content does not adapt with user mobility. Specifically, users
cannot take advantage of the multitude of media devices that they
encounter as they move, in order to achieve a “best” possible
multimedia experience.

In the future, media will transition seamlessly between devices,
networks, and access technologies with the user, as the user moves.
Session continuity technologies, driven by global standards bodies,
will make seamless media mobility possible. Media content will be
optimized based on the real-time conditions of the user, including:
available networks and bandwidth, available device configurations
and rendering capabilities, battery consumption, memory and
processing power, location, cost, etc.

Our demonstration allows a user to transfer a streaming video session
across a collection of laptop and smartphone devices. Specifically,
the demonstration includes: a MAC Pro laptop, a MacBook Air
laptop, Android G1 / G2 smartphones, and a Blackberry Bold 9000
smartphone. Each terminal device runs a small media application,
which presents the user with a set of video clips for viewing. When
the user selects a clip, the application server commands the media
server to stream the requested video. Each video may be viewed to
completion; or, the user may transfer the video session to any of the
other terminal devices in the demonstration. With a click or touch of
the screen, the media application presents the user with a list of
available devices to engage in media transfer sessions. With another
click or touch, the user may trigger a media session transfer:

• The application server dynamically configures the media
server and triggers the target device to get engaged in the
streaming session.

• The target device initializes its media player, which begins
to buffer the video stream. During buffering time, which
lasts a few seconds, an advertisement image is displayed
(pre-roll canvas).

• The originating device continues to play the video, until the
video session begins playing on the target device.

• The target device notifies the originating device as soon as
its initialization is complete and it starts playing the video.
Upon receiving the notification, the originating device tears
down the video session and returns to the media application
home screen.

Furthermore, the media content is optimized for each device and
network. For example, low-resolution 3GP video is streamed to the
smartphone devices and high-definition MPEG4 video is streamed to
the laptop devices.

A typical user scenario, as illustrated in Figure 1, may be:

1. User starts a video clip on the Blackberry phone.
2. User transfers the video session to the Android phone.
3. Finally, user transfers the video session to the MAC laptop.





Figure 1. Example Seamless Multimedia Transfer Scenario.



The demonstration is dynamic (reacting to user interaction) and does
not follow a scripted scenario. The implemented framework can
execute multiple video sessions and concurrent session transfers.