| Summary: | 碩士 === 國立臺灣科技大學 === 資訊工程系 === 98 === The next-generation mobile comunication system targets to integrate heterogeneous wireless
networks, how to design an efficient network selection scheme (NSS) to suit the requirements of
a mobile terminal (MT) becomes an important issue. In this thesis, we will propose a score-based
NSS (SBNSS) utilizing design a network score function with consideration of bandwidth,
received signal strength,
connection cost, price, and velocity of the MT.
For the received signal strength, an optimal threshold that the handoff will execute when
the received signal strength below the threshold is determined to avoid unnecessary handoff.
When using the 3G network, we allow users to enjoy different network services according to
different prices.
SBNSS balances the requests on bandwidth among networks
to decrease the blocking and dropping probabilities.
As for the velocity, SBNSS chooses a suitable network based on the velocity of the MT.
Via simulations, we will show the superiority of SBNSS over the related work in terms of
blocking/dropping probability and horizontal/vertical handoff rate.
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