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—In this paper, an analytical model for the non beacon-enabled mode of the IEEE 802.15.4 medium access control (MAC) protocol is provided. A wireless sensor network (WSN) composed of nodes, which transmit data to a sink through direct links, is considered. Upon reception of a query from the sink, the nodes transmit their packets by using the carrier-sense(More)
— 1 In this paper a mathematical model for the beacon-enabled mode of the IEEE 802.15.4 Medium Access Control (MAC) protocol is provided. A Personal Area Network (PAN) composed of multiple nodes, which transmit data to a PAN coordinator through direct links or multiple hops, is considered. The application is query-based: upon reception of the beacon(More)
Wireless sensor networks (WSNs) enable new applications and require non-conventional paradigms for protocol design due to several constraints. Owing to the requirement for low device complexity together with low energy consumption (i.e., long network lifetime), a proper balance between communication and signal/data processing capabilities must be found.(More)
—We consider a Wireless Body Area Network (WBAN) where wearable sensor devices are distributed on a body and have to send the measured data to a coordinator. The network uses the Carrier Sense Multiple Access with Collision Avoidance algorithm defined by the IEEE 802.15.4 standard as Medium Access Control protocol, whereas different modulation schemes are(More)
This paper investigates the design of tree-based topologies for multi-sink Wireless Sensor Networks (WSNs). Bluetooth and Zigbee are the air interface standards inspiring this work. Tree height, which is related to energy consumption issues, and the average number of children per parent, are the degrees of freedom of such a topology, subject to(More)
A new energy-efficient scheme for data transmission in a wireless sensor network (WSN) is proposed, having in mind a typical application including a sink, which periodically triggers the WSN, and nodes uniformly distributed over a specified area. Routing , multiple access control (MAC), physical, energy, and propagation aspects are jointly taken into(More)