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Spatial queries such as range query and $k$<alternatives> <inline-graphic xlink:type="simple" xlink:href="chen-ieq1-2330836.gif"/></alternatives>NN query in road networks have received a growing number of attention in real life. Considering the large population of the users and the high overhead of network distance computation, it is extremely important to guarantee...
Data availability in mobile information systems is lower than in traditional information systems due to its limitations of wireless communication such as low bandwidth, instability, and easy disconnection. Cooperative data caching is an attractive approach to this problem. This paper proposes an efficient approach for cooperative caching in mobile information systems. We use references to share data...
Data broadcasting is an effective way to disseminate information to a large amount of mobile clients in wireless mobile environments. The k nearest neighbor (kNN) search is one of the important location-based services. In this paper, we propose kNN search protocols using data broadcasting. We consider how the server generates the broadcast schedule with a Voronoi diagram and how the client can efficiently...
Wireless data broadcasting is an effective way for provisioning Location Based Services (LBSs) due to its beneficial characteristics, such as bandwidth-efficiency and scalability. An important functionality of LBSs is to process spatial queries such as range queries and k-Nearest Neighbor (k-NN) queries. In this paper, we explore the problem of processing the generalized spatial queries, which involve...
Mobile search is becoming increasingly important for mobile users as mobile devices are more widely used. Mobile search differs from standard PC-based Web search in a number of ways: (1) the user interfaces and I/O are limited by screen real estate and tiny key pads are tiny, (2) limited bandwidth and costly connection time, (3) increased local search due to mobility. These limitations result in more...
Scheduling for multi-item queries is a problem of practical importance in the field of data broadcast. Most previous works solve the problem under the pattern that at each broadcast moment, the server broadcasts a number of data items which constructs a broadcast cycle with fixed length. Within this pattern, if a query is not scheduled in the current cycle, it usually has to wait for quite a long...
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