Abstract:
This paper proposes to use the novel Fuzzy Logic
Controller (FLC), which is a dynamic buffer size tuning
technique, to support more dependable location-aware
information retrieval. Within a smart space supported by
mobile/pervasive computing a user may request service
from the surrogate through a portable SFF
(small-for-factor) device (e.g. PDA). Therefore, the
one-surrogate-to-many-SFF-clients relationship or
asymmetric rendezvous can easily lead to surrogate
reception buffer overflow during peak demand periods. In
fact, the traffic of requests to a surrogate is tied in with
the transient traveler traffic through the smart space, for
example, an airport. Once overflow has happened the
user cannot benefit from the cyber foraging supported by
the infrastructure. The FLC adaptively tunes the
surrogate buffer size so that the buffer length always
covers the queue length by the givenΔ safety margin. In
this way the chance of surrogate reception buffer overflow
is eliminated, and as a result the asymmetric rendezvous
becomes more reliable and dependable, leading to shorter
SFF-client/surrogate service roundtrip time.
