Proposal for an Automated Algorithm for Optimised Handoff in Integrated Wireless Networks

R. Hunt and M. Keshariya (New Zealand)


Heterogeneous networks, WLAN,CDMA2000, vertical handoff, hysteresis effect, dwelltimers, decision time algorithm.


The motivation for heterogeneous networks arises from the fact that no single technology, service or architecture can provide ubiquitous coverage and high throughput across all geographical areas. Handoff is the mechanism by which an ongoing connection between a mobile node and a correspondent node is transferred from one point of access in the network to another. However, every handoff may result in the loss of data packets resulting in unnecessary network congestion. It also involves a sequence of events in the backbone network, including rerouting and reregistering the connection, which put additional loads on the network traffic. Handoff also has an impact on traffic matching and traffic density. We have proposed and analysed an automated algorithm for optimised handoff between heterogeneous interfaces to integrate different wireless networks. The interface selection algorithm is based on parameters such as current signal strength, interface priority, bit rate, throughput and noise interference. Additionally, introduction of link quality, hysteresis effect and dwell timers optimise the handoff initiation time as well as selection of the most optimal network.

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