We follow this approach since the maximum number of
retransmissions max
i ?¤p required on each path pi can only be defined end-to-end, based on
the maximum permissible delay from the sender node to the receiver. We remark that in
our experiments, the retransmission limit for any part of a path or even for one link li,j is set
equal to max
i ?¤p , since, in principle, all possible retransmissions (until the MSDU expires due
to delay violation) could occur at an individual link. Following the analysis of (7)??“(10), it
is straightforward to define the average MSDU transmissions and the expected delay for
sub-paths that include only a subset of links, or even for an individual link. This will be
proven to be very useful for some of the derivations.
5.2.3 Application and Network-layer Parameter Specification
Since we are considering real-time video streaming through the multi-hop wireless
network, each MSDU v is associated with a corresponding delay limit deadline
v d , before
which the video data encapsulated in the MSDU should arrive at the destination node hn. In
addition, decoding the video data at the video receiver incurs a reduction in the perceived
Cross-layer Optimized Video Streaming over Wireless Multi-hop Mesh Networks 112
distortion, which is represented by Dv.
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