Achieving Reliability of Distributed Applications in Wireless Multi-network Environment
نویسندگان
چکیده
Mobility in modern distributed systems is a vital feature though it brings up such problems as unforeseeable disconnections while crossing the boundaries of wireless cells or networks. Due to the limited coverage and the lack of co-operation between different networks, seamless switching between different networks becomes extremely difficult. This paper addresses the problem of accidental or intentional dropouts of a mobile workstation (MW) from the coverage of a wireless LAN (WLAN) while running a distributed application. The seamless switching between WLAN and WAN is assisted by handover agents, which reside on the MW and the supporting server. Beacons are used to detect the availability of the WLAN and trigger the handover between WLAN and WAN. The results of simulation and prototyping demonstrate that the MW can switch back and forth between WLAN and WAN with the application continue to run and acceptable handover time.
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