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Caching frequently accessed data items on the client side is an effective technique to improve performance in a mobile environment. Classical cache invalidation strategies are not suitable for mobile environments due to the disconnection and mobility of the mobile clients. One attractive cache invalidation technique is based on invalidation reports (IRs). However, the IR-based cache invalidation solution has two major drawbacks, which have not been addressed is previous research. First, there is a long query latency associated with this solution since a client cannot answer the query until the next IR interval. Second, when the server updates a hot data item, all clients have to query the server and get the data from the server separately, which wastes a large amount of bandwidth. In this paper, we propose an IR-based cache invalidation algorithm which can significantly reduce the query latency and efficiently utilize …