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In gas and water utilities, the spread of ultra-low power Wireless-Smart Utility Networks (Wi-SUN) has been predicted. This paper proposes a novel MAC protocol (F-RIT protocol) complied with the RIT in IEEE 802.15.4e standards to implement the wireless SUN in the gas and water utilities effectively. The proposed protocol is compared with CSL in IEEE 802.15.4e in terms of power consumption and success rate of communication link establishment. Theoretical and simulated evaluation results show the effectiveness of the proposed protocol under conditions of high terminal density and highly communication link request. In addition, a potential of F-RIT protocol regarding improvement of performance and expansion of application is described. MACIEEE 802.15.4e U-Bus Air

We study the relaxation of the bi-dimensional kinetically constrained spiral model. We show that, due to the reversibility of the dynamic rules, any unblocked state fully decorrelates in finite times irrespective of the system being in the unjammed or the jammed phase. As a consequence, the evolution of any unblocked configuration occurs in a different sector of phase space from the one that includes the blocked equilibrium configurations at criticality and in the jammed phase. We argue that such out-of-equilibrium dynamics share many points in common with coarsening in the one-dimensional Ising model and we identify the coarsening structures that are, basically, lines of vacancies. We provide evidence for this claim by analyzing the behavior of several observables including the density of particles and vacancies, the spatial correlation function, the time-dependent persistence and the linear response.