System Architecture Design

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pSHIELDSystem Architecture DesignPU6 System Design6.1 Node LayerThe pSHIELD Node Layer concerns the creation of an Intelligent ES HW/SW Platform encompassingintrinsic, innovative SPD functionalities, providing proper services to the pSHIELD Middleware Adaptersenabling the pSHIELD Composability and consequently the desired system SPD.Three different kinds of Intelligent ES Nodes are expected:• nano nodes• micro/personal nodes• power nodesThese three node types (which can be considered three node levels of increasing complexity) representthe basic components of the lower part of the SPD Pervasive System and cover the possiblerequirements of several market areas.Each of these node types provides different levels of capabilities to the remaining pSHIELD layers.This section covers the specifications of the pSHIELD SPD Node Layer, and provides a high leveldescription of the major components and interfaces that make up SPD Nodes. It then describes a generalarchitecture for building-up pSHIELD SPD Nodes and some examples of specific architecture decisionsfor different kinds of Nodes.6.1.1 Formal conceptual modelThe figure below provides a conceptual model of a pSHIELD Node Layer. This is a generic model for allthe pSHIELD Node types, which can be implemented in different architectures, providing differentfunctionalities, different SPD compliance levels and different capabilities, depending on the type of nodeand application field.SPD Node architecture is composed of different functional blocks and each one can implement severalfeatures of different complexity and performance. The choice of which features to implement depends onthe application scenario and SPD Compliance Level required for the system.PUD2.3.2Issue 5 Page 66 of 122
pSHIELDSystem Architecture DesignPUApplication ScenariopSHIELD Middleware LayerarewledidMgacyLesilitieabapCpSHIELD Middleware AdapterCore SPD ServicesandInnovative SPD FunctionalitiesSensed MetadataElaborated MetadataRules for discoveryand compositionSemanticKnowledgeRepositoryControl algorithmsHeterogeneous SPD‐relevantparameters and measurementsSPD Security AgentCommands for composition andconfiguration of SPD modulesExchangedmetadatapSHIELD Node LayerpSHIELD Node AdapterInnovative SPDFunctionalitiespSHIELD Network LayerpSHIELD Network AdapterInnovative SPDFunctionalitiesOther SPD SecurityAgentsLegacy NodeCapabilitiesLegacy NetworkCapabilitiespSHIELD OverlayLayerFigure 16 - Formal conceptual model of pSHIELD SPD Node Layer.The formal conceptual model of a generic pSHIELD Node Layer can be derived from the pSHIELDfunctional component architecture. The pSHIELD Node Layer is an Embedded System Device (ESD)equipped with several Legacy 8 Node Capabilities and a pSHIELD Node Adapter. The pSHIELD NodeLayer is deployed as a hardware/software platform, encompassing intrinsic, innovative SPDfunctionalities, providing proper services and capabilities to the pSHIELD Middleware Adapters to enablethe pSHIELD Composability and consequently the desired system SPD.The pSHIELD SPD Node Layer has two interfaces, one providing pSHIELD Node Capabilities (pS-NC) tothe pSHIELD Middleware Layer and another with legacy, technology-dependent, Node Capabilities (NC).The pSHIELD SPD Node is composed of Legacy Node Capabilities, which consist of one or moreLegacy Device Components, such as CPU, I/O Interfaces, Memory, Battery, etc., and a pSHIELD NodeAdapter (pSNA), interacting with the legacy ESDs and providing SPD functionalities.The pSHIELD Node Adapter includes a set of Innovative SPD functionalities interoperating with thelegacy node capabilities in order to enhance them with the pSHIELD Node Layer SPD enabling8 Legacy means any third-party or of-the-shelf device componentPUD2.3.2Issue 5 Page 67 of 122
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Figure 45 - pSHIELD Security Agent
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