5.1 Introduction
Wireless mesh networks are built based on a mixture of fixed and mobile nodes
interconnected via wireless links to form a multi-hop ad-hoc network. The use of existing
protocols for the interconnection of the various nodes (hops) is typically desired as it
reduces deployment costs and also increases interoperability [1]. However, due to the
network and channel dynamics, there are significant challenges in the design and joint
optimization of application, routing, MAC, and PHY adaptation strategies for efficient
video transmission across such mesh networks.
a Queen Mary University of London
b University of California, Los Angeles
Cross-layer Optimized Video Streaming over Wireless Multi-hop Mesh Networks 106
In this work, we are addressing some of these challenges by developing an integrated
video streaming paradigm enabling cross-layer interaction across the protocol stack and
across the multiple hops. The problem of multi-hop video streaming has recently been
studied under a variety of scenarios [2] [3] [4]. However, the majority of this research does
not consider the protection techniques available at the lower layers of the protocol stack
and/or optimizes the video transport using purely end-to-end metrics, thereby excluding a
significant amount of improvement that can occur by cross-layer design [5] [6] [7].
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