Designing and Prototyping an Event-based Communication System on Mobile Ad Hoc Networks

The event system and more specifically publish/subscribe systems plays an important role in designing and implementing a communication paradigm for distributed systems and networks. Publish/subscribe system with its desirable decouplings seems quite promising for middleware working on distributed networks working in mobile environments. In fact, using event system in such networks empowers the applications to provide higher reliability through an asynchronous communication model on resource restricted nodes. It also improves their scalability and serves them some facilities to support mobility properly. Transhumance Middleware Project [31, 32] as a novel multi-layer and group-based middleware utilizes event system to promote the communication between applications and different middleware modules. This report contains the description and analysis of a genuine publish/subscribe based event system on mobile ad hoc networks which works as a cross-layer overlay architecture and supports the asynchronous communication Transhumance middleware. This event system, called “Chapar”, provides a full-featured event system which support mobility in considerably scaled ad hoc network. Chapar is the first message delivery service known in the history belonged to Persian Empire in hundred years B.C. [Reference: Allyn Huntzinger,“Persians in the Bible”, Global Commission Inc, 2004.]