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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...
With the growing of wireless communication and mobile applications, more and more users and contents are positioned by geographic locations. The importance of query objects involving both the location and textual proximity of content is highlighted. Existing studies mainly focus on keyword query for static objects or query for moving objects without text relevancy. In this paper, we address the challenge...
This paper proposes a low computational complexity adaptive broadcasting algorithm for asymmetric wireless environments. We assume no a priori knowledge of the clients' demands as happens in real environments. The proposed system focuses on lowering the computational complexity of the server's procedure for selecting a data item to broadcast, as well as adapting to the clients' current demands. Simulation...
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...
In this paper, we propose a new broadcast indexing structure AMI (access mode indicator) such that allow mobile clients to determine the time interval of active and sleep mode for connection according to turnaround time. Our goal is to develop a data retrieve protocol that allows mobile users to acquire more valuable data with little power consumption within a limited turnaround time. The experimental...
Nowadays, the backbone network is capable of delivering countless information at extremely high performance and high throughput. However, the abundant information in the backbone may not be retrieved by the mobile users' fingertips. This paper developed the parallel channels content delivery and concurrent retrieval mechanisms so as to support timely and reliable access to the multicasting information...
The progress of wireless communication technologies allows the implementation of high rate applications. Users want to use their mobile devices, equipped with a wireless interface, to watch videos and capture images and video clips. Indeed, these high rate applications can quickly consume the available radio bandwidth. In this context, classical mobile networks provide a throughput which is expensive...
Location based services is considered as a killer application in the wireless data market that provide information based on locations specified in the queries. We consider wireless data broadcasting as a way of disseminating information to a massive number of users. To address the issues of responsiveness, energy consumption and bandwidth contention in wireless communications, an index has to minimize...
This paper investigates embedded databases for the MicroBaseJ project. The project aims at the development of an integrated database and a user interface for a typical 3G mobile phone with Java MIDP2 capability. This includes methods for data acquisition, mobile data and information communication, data management, and remote user interface. One of the key objectives is to target a generic solution...
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