A New Internet-Draft is available from the on-line Internet-Drafts directories.
Title : Reorder Density and Reorder Buffer-occupancy Density -
Metrics for Packet Reordering Measurements
Author(s) : A. Jayasumana, et al.
Filename : draft-jayasumana-reorder-density-03.txt
Pages : 26
Date : 2004-7-21
Out of order arrival of packets is a common occurrence on Internet,
and it will be more widespread as the link speeds increase.
Percentage packet reordering is vague and unclear. A good reorder
metric will capture the occurrence and characteristics of reordering
comprehensively, and 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 upper 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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