Abstract
Distributed computing pervasiveness is nowadays undeniable, and will continue to grow as the usage of device-to-device communications and the number of connected things populating our daily environment increase. Due to the connectivity disruptions induced by the mobility of devices communicating through short-range wireless interfaces and by the sleep phases of devices, it is often difficult to exploit the resources offered by the connected things forming these pervasive environments through the services they provide, and even harder to compose these services together so as to provide users with more useful and sophisticated services. This paper presents a service composition system adapted to opportunistic networks. This composition system relies on a service provision platform that exploits opportunistic networking and computing techniques to cope with connectivity disruptions. Service composition is performed dynamically, according to users’ interests. A multi-strategy scheme is used for the invocation of composite services, and a recovery mechanism is possible through partial invocation. This paper also presents the evaluation of the proposed composition system on two different scenarios: one involving people roaming in an open area, and another one involving spectators of a running event.
Highlights
Nowadays, wireless networks are composed of a variety of heterogeneous devices that can communicate directly with one another, ranging from resource-constrained sensors to mobile devices and smart home appliances
Device-to-device communication (D2D) is receiving more attention as direct communication between nearby devices through short-range wireless interfaces offers new data exchange schemes, which could help supporting the ever-growing data traffic, while simultaneously increasing the computing pervasiveness of our physical environment. This kind of communication allows users to exploit directly, or through intermediate devices, the resources offered by the devices populating this environment, resources that are usually made exploitable through services
Due to the limited resources of the devices, applications designed to be used in such environments are generally developed as a combination of basic services that are distributed over a collection of devices
Summary
Wireless networks are composed of a variety of heterogeneous devices that can communicate directly with one another, ranging from resource-constrained sensors to mobile devices and smart home appliances. After being neglected for many years, especially in cellular networks, device-to-device communication (D2D) is receiving more attention as direct communication between proximate devices can help to perform peer-to-peer data exchanges between user equipment, to offload data traffic in cellular networks, to support machine-to-machine communications needed by the Internet of Things, to efficiently provide local services, etc. Networking or DTN emerged to cope with the connectivity disruptions and the additional delays introduced by device mobility, short network interface radio range, and frequent and unpredictable periods of sleep mode to save energy. Principle, have been proposed to address the issues posed by connectivity disruptions and by multi-hop communication [1]. These techniques allow to transfer messages between devices even if there is no end-to-end path between them. With the objective of providing a higher-level programming paradigm, several service delivery protocols relying on these networking techniques have been studied
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