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Internet Vehicular Ad hoc NETwork (IVANET) is a combination of wired Internet and Vehicular Ad hoc NETwork (VANET) through roadside infrastructure for universal communication among vehicles. A key optimization technique in IVANET is to cache frequently accessed data items in local storage of vehicles. A critical design issue is how to keep cache copies valid or invalidate them when original data item changed. This is important in IVANET where vehicles move very fast. Only 40% data updating is needed in city while 60% data updating is needed on highway.
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