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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...
XML data broadcast is an efficient way to disseminate semi-structured information in wireless mobile environments. Air indexing is the common method to improve the access time, and reduce the energy consumption in a broadcast system. In this paper, we propose a novel two-tier air indexing method that provides an overall picture of the document set in the server which is necessary for XML data retrieving...
Data broadcast is an efficient way of data dissemination in the wireless mobile environment. Recently, many researchers pay attention to broadcast scheduling for multi-item queries which is a more practical problem in this field. However, only a few works discuss the scheduling problem in on-demand environment. In this paper, we propose a heuristic approach called LRL for the broadcast scheduling...
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...
Data broadcast is an efficient way for information dissemination in wireless mobile environments. On-demand XML data broadcast is a rising research issue in this area. How to schedule the XML data on wireless channel is critical for this issue. When scheduling the XML data, previous work proposed to satisfy the user queries which request fewer branches of the broadcasted XML documents first. However,...
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