1. FAST CHANNEL ZAPPING WITH DESTINATION-ORIENTED MULTICAST
FOR IP VIDEO DELIVERY
ABSTRACT:
Channel zapping time is a critical quality of experience (QoE) metric for IP-based video delivery
systems such as IPTV. An interesting zapping acceleration scheme based on time-shifted
subchannels (TSS) was recently proposed, which can ensure a zapping delay bound as well as
maintain the picture quality during zapping. However, the behaviors of the TSS-based scheme
have not been fully studied yet. Furthermore, the existing TSS-based implementation adopts the
traditional IP multicast, which is not scalable for a large-scale distributed system. Corresponding
to such issues, this paper makes contributions in two aspects.
First, we resort to theoretical analysis to understand the fundamental properties of the TSS-based
service model. We show that there exists an optimal subchannel data rate which minimizes the
redundant traffic transmitted over subchannels. Moreover, we reveal a start-up effect, where the
existing operation pattern in the TSS-based model could violate the zapping delay bound. With a
solution proposed to resolve the start-up effect, we rigorously prove that a zapping delay bound
equal to the subchannel time shift is guaranteed by the updated TSS-based model.
Second, we propose a destination-oriented-multicast (DOM) assisted zapping acceleration
(DAZA) scheme for a scalable TSS-based implementation, where a subscriber can seamlessly
migrate from a sub channel to the main channel after zapping without any control message
exchange over the network. Moreover, the sub channel selection in DAZA is independent of the
zapping request signaling delay, resulting in improved robustness and reduced messaging
overhead in a distributed environment. We implement DAZA in ns-2 and multicast an MPEG-4
video stream over a practical network topology. Extensive simulation results are presented to
demonstrate the validity of our analysis and DAZA scheme.
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