In a context-aware information service, the service answer depends on the context (e.g. time and location) from which the user issues a query. In a mobile scenario, this impfies that the service must be able to refresh the mswer to a query that is sti~"active", when a change in the user context invddates the previously provided answer. In a mobile wireless environment the latency observed by the user before he/she gets up to date information may be high because of the low available bandwidth. A high latency means a long time interti where the user is provided with information not appropriate for his/her context.To rd uce latency, prefetching techniques are usefti; however, these techniques must be tailored to the pecutiar characteristics of a mobile scenario, where the available bandwidth is quite low, and user devices are typictiy portable computers, with Umited battery fifetime. We propose a general framework to evaluate the effectiveness of prefetching poficies for context-aware information services, and etiuate some of these poficies under different mobifity modeb.Permission to make di@taIor h3rd copies of all or part of this \vork for person31or classroom use is granted \\ithout fee provided that copies are not made or distributed for prolit or commercial advantage and that copies bear this notice and the full citation on the first page. To copy othen~ise. to republish, topostonse~rers or10redis~butetolists> requires prior specific permission and~ora fee.
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