Hence, the subsequent problem
specification and analysis is inherently scalable and can be applied in a similar fashion to
either the entire end-to-end topology or only part of the topology (sub-network). Finally, it
is important to mention that all the proposed algorithms in this chapter assume the non-
3 For example, in order to utilize the medium more efficiently, it is possible to piggyback feedback about the link
status information onto the acknowledgment packets.
Cross-layer Optimized Video Streaming over Wireless Multi-hop Mesh Networks 110
existence of routing loops, i.e., the mesh network between the current hop and the
destination hop can be represented by a tree graph.
5.2.2 Link and Path Parameter Specification
For each link li,j, given a certain modulation m(li,j) at the physical layer, we denote the
expected bit error rate as e(li,j). Notice that this error is usually estimated based on channel
modeling as well as experimental studies in the network which analyze the effects of
interference [11]. As a result, the higher layers of the protocol stack can assume e(li,i) to be
independent and randomly distributed [22]. Under a predetermined negotiation of traffic
specification parameters for each link in the mesh network (e.
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