Abstract
This paper examines flexibility in ad hoc networks and suggests that,
even with cross-layer design as a mechanism to improve adaptation,
a fundamental limitation exists in the ability of a single optimization
function, defined a priori, to adapt the network to meet all quality-of-service
requirements. Thus, code implementing multiple algorithms will have
to be positioned within the network. Active networking and programmable
networking enable unprecedented autonomy and flexibility for ad
hoc communication networks. However, in order to best leverage the
results of active and programmable networking, metrics that indicate
the nature and location of required flexibility need to be developed.
The primary contribution of this paper is to propose a metric that
couples network topological rate of change with the ability of a
generic service to move itself to an optimal location in concert
with the changing network. This metric points to a fundamental tradeoff
among adaptation (changing service location), performance (sophistication
or estimated minimum code size of the service), and the network�s
ability to tune itself to a changing ad hoc network topology.
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