We propose an integrated cross-layer optimization algorithm aimed at
maximizing the decoded video quality of delay-constrained streaming in a multi-hop
wireless mesh network that supports quality-of-service (QoS). The key principle of our
algorithm lays in the synergistic optimization of different control parameters at each node
of the multi-hop network, across the protocol layers - application, network, medium access
control (MAC) and physical (PHY) layers, as well as end-to-end, across the various nodes.
To drive this optimization, we assume an overlay network infrastructure, which is able to
convey information on the conditions of each link. Various scenarios that perform the
integrated optimization using different levels (???horizons???) of information about the
network status are examined. The differences between several optimization scenarios in
terms of decoded video quality and required streaming complexity are quantified. Our
results demonstrate the merits and the need for cross-layer optimization in order to provide
an efficient solution for real-time video transmission using existing protocols and
infrastructures. In addition, they provide important insights for future protocol and system
design targeted at enhanced video streaming support across wireless mesh networks.
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