Publish/subscribe systems are one of the most efficient models used to disseminate various information to multiple users in alerting services. However, these systems are faced with several issues; including a lack of support for mobile devices, an inability to handle numerous subscribers, high transmission time, and issues with handling an increased network and changes in the user's location, since tradition systems are designed without alleviate these issues, many of these systems have high transmission times when trying to distribute event messages to all of their subscribers. The geographical relationship between subscribers and the broker network and recognizing mobile subscribers' patterns are often ignored in these research projects, and so they fail to demonstrate efficient performances. The publish/subscribe system based on the Q+R tree presented in this thesis provides an alternative approach for alerting services. This system is comprised of three parts: a publisher, overlay broker network and mobile subscribers. The publisher generates event messages and distributes them to the overlay broker networks. The overlay broker networks then forward the message from the publisher to those mobile subscribers who desire the message. Finally, the mobile subscribers connect with a geographically close broker, and they can change brokers based on their geographical location. This thesis demonstrates that the proposed publish/subscribe system results in a faster transmission time from publisher to mobile subscribers, allows less traffic in the network, and reduce the burden of frequently changing the locality of the mobile subscribers. These results indicate that the proposed system for a viable solution for mobile subscribers in alerting systems.
|Commitee:||Mehrotra, Sharad, Regan, Amelia|
|School:||University of California, Irvine|
|Department:||Networked Systems - M.S.|
|School Location:||United States -- California|
|Source:||MAI 50/05M, Masters Abstracts International|
|Keywords:||Notification system, Overlay broker network, Publish/subscribe|
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