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OCARI (acronym of Optimization of Communication for Ad hoc Reliable Industrial network) is a communication protocol for Industrial Wireless Sensor Network. It is developed by the following consortium during the OCARI project that is funded by the French National Research Agency (ANR): * Électricité de France, project leader * DCNS * One-RF Technologies now Telit RF () * LATTIS * LIMOS * INRIA * LRI Since the end of the ANR project, DCNS, EDF and INRIA continued to work together (with the participation of (Adwave ) and (BeamLogic )) to industrialize OCARI and form an industrial alliance (see (OCARI website )) to develop a sustainable ecosystem of OCARI. The industrial implementation of OCARI is currently based on Dresden-Elektronik deRFsam3-23T09-3 and Adwave ADWRF24-LRS hardware platforms that use the Cortex M3 MCU and the Atmel AT86RF233 transceiver. == OCARI Features == OCARI distinguishes from protocols such as ZigBee, WirelessHART and Isa100.11a by the following characteristics: * A medium access method that combines CSMA/CA and an optimized TDMA based on 3-hops coloring. * A proactive energy efficient routing strategy supporting nomadism, called EOLSR (Energy efficient OLSR). * An activity scheduling mechanism that is based on a three-hop coloring algorithm helps to reduce interference and thus optimizes node's energy consumption, called OSERENA. The operating cycle of OCARI is divided into four periods: * (): Multihop deterministic synchronization of nodes using beacons. * (): Transmission of messages and signaling by competition. * (): Transmission of data messages with requirements (collection and dissemination) by colored slots * (): Sleep OCARI cycle The topology of an OCARI network is organized as follows: * Coordinator (equivalent of "IEEE 802.15.4 PAN coordinator"): global coordinator of a sensor cluster. Its role is to initiate the network and manage it: allocation of network addresses, network access management and access point to the whole sensor network. * Router participates in the hierarchical tree relay (with TTL) when the colors are not yet assigned and the ad hoc routing. Ocari topology 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「OCARI」の詳細全文を読む スポンサード リンク
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