Description of the deliverable content and purpose
e-SENSE WP3 proposes several proof-of-concept platforms for some of the studies undertaken within the work package, part of them being in wider test beds integrated and shown in e-SENSE WP5 as is the case for the LetiBee transceiver implementation.
The goal of this deliverable is to show hardware “real life” verification of some proposed concepts, among them:
? An ultra low power implementation of a IEEE802.15.4 compliant PHY layer
? A compact steerable antenna for IEEE802.15.4a compliant UWB systems
? An IEEE802.15.4 based BSN system optimisation
? A complete cross-layer optimised protocol for ESN over IEEE802.15.4 (IRIS)
? A novel flooding protocol using IEEE802.15.4 for interest dissemination (PFS).
The first two proof-of-concept platforms are hardware related, based on mostly physical layer technologies, which were studied in task 3.1. The LetiBee chip is an IEEE802.15.4 transceiver which targets a figure of merit of 20nJ/bit in the active modes. The results of its tests and measurements are presented and compared to simulations, with a specific highlight on power consumption which, for the key aspects, is in line with the predictions.
However, deviations are stressed and modifications of the design to achieve the initial goals are proposed. The second platform is an integrated antenna subsystem for UWB radios in the high band with directivity and beam steering capabilities. The possibility to use such antennas in the different e-SENSE scenarios is shown and one is selected for a detailed analysis (“visit to the museum”). Addressed challenges concern the antenna bandwidth and frequency behaviour plus the combination of several elements with RF MEMs based switches to obtain the complete array.
The last three platforms are related to the implementation and validation of some protocol elements introduced in task 3.2 onto commercial-of-the-shelves (COTS) nodes made of IEEE802.15.4 radios. The energy efficiency and over-the-air traffic in a BSN application were improved in the first one thanks to both a power control implemented in the MAC and a decentralized data driven decision mechanism. The second platform serves an extensive validation of the IRIS MAC-NWK cross layer optimized protocol for interest dissemination and convergecasting which is highly suitable for ESNs such as the ones addressed in the industrial application space of e-SENSE. This contribution complements the set of simulations reported in other WP3 deliverables. The IRIS protocol is selected as an example of a protocol instantiation of the e-SENSE architecture. The last one is an enhanced flooding protocol useful for different purposes in networking. Several state-of-the-art options are compared to the proposed PFS protocol, which shows superiority on several figures of merit.
The HW validation appeared to be useful to further improve the PFS protocol which was already extensively simulated in previous WP3 deliverables.
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