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Wireless sensor networks based on the IEEE 802.15.4 standard is able to achieve low-power transmissions in low-rate and short-distance wireless personal area networks (WPANs). It employs the slotted carrier sense multiple access with collision avoidance (CSMA/CA) in the contention access period (CAP). Unfortunately the periodic broadcast beacon frame is transmitted without CSMA/CA so that it could...
Analysis of IEEE 802.15.4 CSMA/CA scheme with homogeneous or saturated traffic has received considerable attention recently since a great convenience is offered to applications of low-power and low-rate wireless sensor networks (WSNs) which almost touch upon all aspects of our life. In this paper, we propose a stochastic analysis approach to evaluate the delay performance of CSMA/CA scheme with heterogeneous...
We investigate the performance of IEEE 802.15.4 MAC (Medium Access Control) sublayer in beacon-enabled tree-topology Wireless Sensor Networks (WSNs). To our knowledge, current literature has mostly focused on relatively simpler star topology or non-beacon-enabled peer-to-peer networks. In our work, we first respectively evaluate the impact of different traffic loads from the source nodes in each depth...
IEEE 802.15.4 is the emerging next generation wireless standard designed for low-rate wireless personal area networks (LR-WPAN), which suit wireless sensor networks applications. It attempts to provide a low cost, low power and short range wireless networking. The QoS is more challenging in heterogeneous wireless sensors networks, where a diverse mixture of sensors for monitoring temperature, pressure,...
In this paper the focus is on the performance study of four routing protocols, namely AODV, AODVUU, RAODV and AOMDV. We call these protocols AODV family of protocols as all these protocols consider AODV as the base routing protocol upon which these protocols are improved. Even though AODV and AODVUU are not different protocols, we wanted to see if there is any improvement in using the AODVUU implementation...
Recent technological advances in sensors, low power integrated circuits, and wireless communications have enabled the design of low-cost, lightweight, and intelligent physiological sensor nodes. The IEEE 802.15.4 is a new wireless personal area network designed for wireless monitoring and control applications. The fast progress of research on energy efficiency in wireless sensor networks, and the...
Energy-efficient performance is a central challenge in sensor network deployments, and the radio is a major contributor to overall energy node consumption. Current energy- efficient MAC protocols for sensor networks use a fixed low power radio mode for putting the radio to sleep. Fixed low power modes involve an inherent tradeoff: deep sleep modes have low current draw and high energy cost and latency...
In this paper, we consider the interconnection of IEEE 802.15.4 beacon-enabled network clusters using ordinary network nodes as bridge nodes. Although the IEEE 802.15.4 standard does not say anything about cluster interconnection, by following the analogy with IEEE 802.15.1 networks, we denote such a bridge as the slave-slave (SS) bridge. We develop queuing and Markov chain models for clusters that...
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