A Communication Model to Integrate the Request-Response and the Publish-Subscribe Paradigms into Ubiquitous Systems

Abstract

The Request-Response (RR) paradigm is widely used in ubiquitous systems to exchange information in a secure, reliable and timely manner. Nonetheless, there is also an emerging need for adopting the Publish-Subscribe (PubSub) paradigm in this kind of systems, due to the advantages that this paradigm offers in supporting mobility by means of asynchronous, non-blocking and one-to-many message distribution semantics for event notification. This paper analyzes the strengths and weaknesses of both the RR and PubSub paradigms to support communications in ubiquitous systems and proposes an abstract communication model in order to enable their seamless integration. Thus, developers will be focused on communication semantics and the required quality properties, rather than be concerned about specific communication mechanisms. The aim is to provide developers with abstractions intended to decrease the complexity of integrating different communication paradigms commonly needed in ubiquitous systems. The proposal has been applied to implement a middleware and a real home automation system to show its applicability and benefits.

An Embedded Internet of Energy Communication Platform for the Future Smart Microgrids Management

“…Besides, energy systems are becoming increasingly complex, so it is vital to build flexible architectures with a high capacity to exchange information in a networking environment that is in continuous evolution. In such an environment some quality properties, like efficiency, mobility support, adaptability, reliability, and timeliness, are required [23]. The fulfilment of these requirements is achieved by middleware solutions, located in the service layer, mainly based on the Request/Response (RR) or the Publish/Subscribe (PubSub) paradigms.…”

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“…It is worth pointing out that conventional middleware platforms have been developed by implementing only one of the two communication paradigms [23]. However, middleware solutions for microgrids need simultaneously using RR and PubSub-based communication mechanisms [12], [23], [24]. The reasons for that are, on the one hand, that in a microgrid the control information among DERs require a communication system based on query-response.…”

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