Computer Science – Networking and Internet Architecture
Scientific paper
2006-08-29
Computer Science
Networking and Internet Architecture
12 pages
Scientific paper
In this paper, we examine the cause of the border effect observed in many mobility models used to construct simulations of ad hoc networking protocol performance. We specify conditions under which a node mobility model must produce spatial mobile node distribution functions that obey the diffusion equation. In particular demonstrate that these conditions are satisfied by the random direction (RD) model. We show that it is possible to construct mobility models that attain uniform steady-state distributions without resorting to reflection or ``wrapping'' of nodes at the border of a test region. Finally, we show that the random waypoint (RWP) model may be reproduced by the application of a ``volume rule'' to an RD model. This volume rule violates the assumptions that lead to the diffusion equation. We suggest a generalization of the RWP model that can provide more uniform mobile node distributions.
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