The  increased deployment of wireless networks for battery-limited industrial applications in recent years highlights the need for tractable performance analysis and efficient QoS-aware transmit power management schemes. Modern industrial solutions deploy multi-hop topologies in order to bridge larger distances without necessarily shortening nodes' battery lifetime. This poses a significant challenge, as multi-hop analysis for heterogeneous wireless networks does not exist prior to our work. We overcome this challenge by extending a newly developed methodology based on (min,x) network calculus and provide a closed-form expression for the end-to-end delay violation probability over a cascade of heterogeneous buffered wireless fading channels. We further design model-based algorithms for power-minimization and network lifetime maximization which compute the optimal transmit power per node, along a QoS-constrained path. Our numerical study shows an overall transmit power savings of up to 95\% when compared to a fixed power allocation . We also apply our algorithm to a realistic WirelessHART network setup and observe that link heterogeneity can significantly influence network lifetime when no efficient power management is applied. This work is especially useful for battery-powered wireless sensor nodes in QoS-constrained applications and offers a solid framework for network design and performance analysis of heterogeneous multi-hop wireless industrial networks.
The noticeably increased deployment of wireless networks for battery-limited industrial applications in recent years highlights the need for tractable performance analysis methodologies as well as efficient QoS-aware transmit power management schemes. In this work, we seek to combine several important aspects of such networks, i.e., multi-hop connectivity, channel heterogeneity and the queuing effect, in order to address these needs. We design delay-bound-based algorithms for transmit power minimization and network lifetime maximization of multi-hop heterogeneous wireless networks using our previously developed stochastic network calculus approach for performance analysis of a cascade of buffered wireless fading channels. Our analysis shows an overall transmit power saving of up to 95\% compared to a fixed power allocation scheme when using a service model in terms of the Shannon capacity limit. For a more realistic set-up, we evaluate the performance of the suggested algorithm in a WirelessHART network, which is a widely used communication standard for process automation and other industrial applications. We find that link heterogeneity can significantly reduce network lifetime when no efficient power management is applied. Moreover, we show, using extensive simulation study, that the proposed bound-based power allocation performs reasonably well compared to the real optimum, especially in the case of WirelessHART networks.
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bridge larger distances without necessarily shortening nodes' battery lifetime. This poses a significant challenge, as
address these needs. We design delay-bound-based algorithms for transmit power minimization and network lifetime maximization of
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We further design model-based algorithms for power-minimization and network lifetime maximization which compute the optimal transmit power per node, along a QoS-constrained path. Our numerical study
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. We also apply our algorithm to a realistic WirelessHART network setup and observe
scheme when using a service model in terms of the Shannon capacity limit. For a more realistic set-up, we evaluate the performance of the suggested algorithm in a WirelessHART network, which is a widely used communication standard for process automation and other industrial applications. We find
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This work is especially useful for battery-powered wireless sensor nodes in QoS-constrained applications and offers a solid framework for network design and performance analysis of heterogeneous multi-hop wireless industrial
Moreover, we show, using extensive simulation study, that the proposed bound-based power allocation performs reasonably well compared to the real optimum, especially in the case of WirelessHART