Wednesday, March 24, 2010

self-adaptive

In order to improve the algorithm, we proposed a self-adaptive and prediction-based smooth handoff(APBSH) algorithm. The key idea of the algorithm is using the varying recent network environment parameters to predict the next time′s situation and then cheap white wedding dresses 2010 self-adaptively choosing the suitable handoff strategy according to the prediction results to accomplish the handoff before losing the connection of the current AP and improve the cheap wedding gown dresses 2010 quality of data service.Next, with the inspiration from the fast handoff scheme with multiple radios, combined with the features of most existing WLAN which mobile host (STA) is distribution-intensive and with small numble of data exchange, we proposed a substituted scan-based fast handoff (SSBFH) algorithm cheap bridal wedding dress 2010, and implemented it in the 802.11 protocol. The algorithm uses the spare capacity of the STA instead of STA which need to handoff to complete the scan work the flat iron shop for us, which almost completely eliminates the scanning stage, reduces the handoff delay greatly.Finally, with depth study of network simulation tool NCTUns, we added the adaptive predictive-based 12hot cheap prom dresses smooth handoff module and the substituted scan-based fast handoff module into NCTUns network simulator and separately evaluated the performance of two algorithm in NCTUns simulations. The experiment showed that APBSH algorithm could accommodate with different network environments, assure the optimization of the handoff′s performance and better than standard 802.11 handoff algorithm and smooth handoff algorithm, while the SSBFH algorithm which is applicable to the network which is dense-distributed and has some unbusy STAs, could not only reduce the handoff delay, but also make good use of the network resources.
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