For instance, based on the available information feedback, a network node can select an
alternate (less congested) route for streaming video packets that have a higher contribution
to the overall distortion or a more imminent deadline. These issues are investigated in more
detail in [33].
To enable the information feedback, we assumed that a directed acyclic overlay
network topology can be superimposed over any wireless multi-hop network to convey (in
frequent intervals) information about the expected BER, the queuing delay for each link, as
well as the guaranteed bandwidth under the dynamically-changing modulation at the PHY.
Methods for constructing such overlay structures given a specific multi-hop network and a
set of transmitting-receiving pairs can be found in [34] [35] [36]. Additionally, several
examples of such application-layer overlay networks have been proposed in [19] [20].
Although we consider the SINR experienced at each link, the cross-layer streaming
solution proposed in this chapter ignores the effects of interference that arise due to the
broadcast nature of the wireless medium (e.g., transmitter-receiver, transmitter-transmitter,
or receiver-receiver interference).
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