As mentioned earlier, fuzzy logic based VHDA has its
advantages, which can offer precise handoff evaluation and
help to select the optimized network. However, it also has
the limitations. Compared with cost function based VHDA
the computational work of fuzzy logic based VHDA is
relatively much. This has almost no impact on handoffs
initiated by MNs because each MN can sufficiently deal with
its own computational work and make handoff decisions
quickly. However, for handoffs initiated by an attachment
point, a great quantity of the computation about handoff
decisions relies on the attachment point, whose available
resources are already quite limited. If fuzzy logic based
VHDA IS employed in this situation, it is intolerable for an
attachment point to do such a large amount of computational
work to make fast and efficient handoff decisions.
As mentioned earlier, fuzzy logic based VHDA has its advantages, which can offer precise handoff evaluation and help to select the optimized network. However, it also has the limitations. Compared with cost function based VHDA the computational work of fuzzy logic based VHDA isrelatively much. This has almost no impact on handoffs initiated by MNs because each MN can sufficiently deal with its own computational work and make handoff decisions quickly. However, for handoffs initiated by an attachment point, a great quantity of the computation about handoff decisions relies on the attachment point, whose available resources are already quite limited. If fuzzy logic based VHDA IS employed in this situation, it is intolerable for an attachment point to do such a large amount of computational work to make fast and efficient handoff decisions.
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