Technology - Available in Android
Abstract—The rapidly increasing power of personal mobile
devices (smart phones, tablets, etc.) is providing much richer contents and
social interactions to users on the move. This trend however is throttled by
the limited battery lifetime of mobile devices and unstable wireless
connectivity, making the highest possible quality of service experienced by
mobile users not feasible. The recent cloud computing technology, with its rich
resources to compensate for the limitations of mobile devices and connections,
can potentially provide an ideal platform to support the desired mobile
services. Tough challenges arise on how to effectively exploit cloud resources
to facilitate mobile services, especially those with stringent interaction
delay requirements. In this paper, we propose the design of a Cloud-based,
novel Mobile social tV system (CloudMoV). The system effectively utilizes both
PaaS (Platform-as-a-Service) and IaaS (Infrastructure-asa- Service) cloud
services to offer the living-room experience of video watching to a group of
disparate mobile users who can interact socially while sharing the video. To
guarantee good streaming quality as experienced by the mobile users with time
varying wireless connectivity, we employ a surrogate for each user in the IaaS
cloud for video downloading and social exchanges on behalf of the user. The
surrogate performs efficient stream transcoding that matches the current
connectivity quality of the mobile user. Given the battery life as a key
performance bottleneck, we advocate the use of burst transmission from the
surrogates to the mobile users, and carefully decide the burst size which can
lead to high energy efficiency and streaming quality. Social interactions among
the users, in terms of spontaneous textual exchanges, are effectively achieved
by efficient designs of data storage with BigTable and dynamic handling of
large volumes of concurrent messages in a typical PaaS cloud. These various
designs for flexible transcoding capabilities, battery efficiency of mobile
devices and spontaneous social interactivity together provide an ideal platform
for mobile social TV services. We have implemented CloudMoV on Amazon EC2 and
Google App Engine and verified its superior performance based on real world experiments.
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