Consequently, the inherent network dynamics occurring in a multi-hop wireless mesh
network as well as the interaction among the various layers of the protocol stack are not
fully considered in the existing video streaming literature. Indeed, recent results concerning
the practical throughput and packet loss analysis of multi-hop wireless networks [8] [9]
have shown that the incorporation of appropriate utility functions that take into account
specific parameters of the protocol layers such as the expected retransmissions, the loss rate
and bandwidth of each link [8], as well as expected transmission time [9] or fairness issues
[10], can significantly impact the actual end-to-end network throughput. Motivated by this
work, we show that, for delay-constrained video streaming over multi-hop wireless mesh
networks, including the lower layer network information and adaptation parameters in the
cross-layer design can provide significant improvements in the decoded video quality.
We focus on the problem of real-time transmission of an individual video bitstream
across a multi-hop 802.11a/e wireless network and investigate i) what is the video quality
improvement that can be obtained if an integrated cross-layer strategy involving the various
layers of the protocol stack is performed and ii) what is the performance and complexity
impact if the optimized streaming solution is performed using only limited, localized
information about the network status, as opposed to global, complete information.
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