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Title : Reorder Density and Reorder Buffer-occupancy Density Metrics for Packet Reordering Measurements
Author(s) : A. Jayasumana, et al.
Filename : draft-jayasumana-reorder-density-06.txt
Pages : 23
Date : 2006-3-7
Out-of-order arrival of packets is a common occurrence on the
Internet, and it will become more widespread as link speeds increase.
A good reorder metric will capture the occurrence and characteristics
of reordering comprehensively, and will have broader utility than
merely distinguishing among different reordered sequences.
Two metrics for packet reordering are presented, namely, Reorder
Density (RD) and Reorder Buffer-occupancy Density (RBD). A threshold
is used to clearly define when a packet is considered lost, to bound
computational complexity at O(N), and to keep the memory requirement
for evaluation independent of N, where N is the length of the packet
sequence. RD is a comprehensive metric that captures the
characteristics of reordering, while RBD evaluates the sequences from
the point of view of recovery from reordering. These metrics are
simple to compute yet comprehensive in their characterization of
packet reordering. The measures are robust and orthogonal to packet
loss and duplication.
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