Multiple Protocols Interworking With Open Connectivity Foundation in Fog Networks

Abstract

Intelligent applications have greatly promoted the development of fog computing. The protocols have emerged diversely, causing the problems in the interworking between terminal devices, which has seriously hindered the development of fog computing. Based on the open connectivity foundation (OCF) protocol, this paper proposes an interworking solution for intelligent devices and designs an OCFbased multi-protocol gateway to access non-OCF services. The main functions are divided into three categories: manager, adapter, and device agent. In part, the manager provides centralized management services, the adapter provides communication services between the client and the server device, and the device agent provides access services for the server device. The semantic conversion scheme of an OCF protocol with other protocols is proposed in the device agent, which solves the problem of interoperability between an OCF client device and non-OCF server devices. Finally, the OCF multi-protocol interworking gateway was built, and the semantic conversion between the OCF protocol, AllJoyn protocol, and the ZigBee protocol was implemented. The interoperability between the OCF client, AllJoyn device, and ZigBee device was verified.INDEX TERMS Standards, OCF, semantic conversion, multi-protocol, gateway. I. INTRODUCTION Intelligent applications have covered retail [1], logistics [2], medical [3], home [4], urban construction [5] and other fields [6], becoming a hot new trend. Faced with a large number of local applications, a large amount of business data is generated, and fog computing is urgently needed for processing the data to achieve intelligence. As the means of information transmission for the fog computing, TD-SCDMA [7], Fog Radio Access Networks(F-RAN) [8], Cloud Radio Access Networks (C-RAN) [9], hierarchical radio resource allocation [10], and network slicing in fog networks [11], provide an effective means and strong support for fog computing. On the other hand, the development of the IoT protocol has greatly promoted the fog computing application. Enterprises and vendors propose their own standards and communication protocols [12], and build their own ecosystem, including Google's solution for smart applications, Android Things [13], Apple's solution for smart home platform, HomeKit [14], Haier U+ solutions with smart life as the mainstay [15], as well as access technologyThe associate editor coordinating the review of this manuscript and approving it for publication was Mugen Peng.

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