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An Adaptive XML Data Broadcast Scheme in Mobile Computing Environment

Author: GongSong
Tutor: YangJinCai
School: Central China Normal University
Course: Applied Computer Technology
Keywords: Mobile computing XML Adaptive Broadcast Scheduling
CLC: TP393.01
Type: Master's thesis
Year: 2009
Downloads: 50
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Abstract


With XML rapidly growing popularity of mobile computing applications , XML access and transmission efficiency requirements . Therefore , in the mobile computing environment, efficient access to and transmission of XML documents has become a hot research . In the mobile computing environment , data broadcasting is an effective data dissemination . Demand broadcast is an efficient way for mobile clients personalized data acquisition . XML query packet-based distribution agent in mobile computing environment based on analysis of existing XML query technology and on-demand data broadcasting technology , XML -demand data broadcasting system structure , namely the C / D / S structure . In addition , the proposed adaptive demand XML data broadcast mechanism in a mobile computing environment . On the server side , first of all the source XML document according to user requests branching cutting , removing redundant node data , and then using a dynamic index structure (1, d) and adaptive data broadcast scheduling algorithm , based on the current system load , dynamically adjusting the degree of the block of the broadcast data . Between the client and server , a packet-based XML query Distribution Agent , according to the depth of the XML query prefix to the user's request is divided into different groups . Then the Distribution Agent to grouping with deep rate packet scheduling, in turn , the user the XML request delivery to the server . After access to the desired data , XML query Distribution Agent restore the broadcast data into XML documents and then sent to the corresponding mobile client . Finally, the proposed broadcast mechanism simulation experiments to evaluate the system performance . Experimental results show that the XML redundancy branching filter , it is possible to effectively improve the bandwidth utilization . Distribution Agent user XML request packet processing, adaptive scheduling and XML query by the server side can significantly reduce the access time and a tuning time , thereby effectively improving the access and transfer efficiency of the XML . In addition, in the case of shortage of the startup and shutdown WNI larger delay , and network bandwidth , the mechanism on the XML data access and transmission more advantages.

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