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– In this paper we introduce TFMAC, a hybrid MAC protocol especially designed for wireless sensor networks in which each sensor node is equipped with a single half-duplex transceiver with multiple-frequency support. TFMAC incorporates multiple channels into a traditional TDMA scheme allowing different sensor nodes in a neighborhood to transmit on different(More)
Time-Division Multiple-Access (TDMA) is a common MAC paradigm in wireless sensor networks. However, in its traditional form, the TDMA-based protocols suffer from low channel utilization and high message delay because of a long frame length needed to provide collision-free transmissions, which is particularly damaging in dense wireless sensor networks. In(More)
– This paper deals with multi-channel Media Access Control (MAC) protocols for Wireless Sensor Networks (WSNs). We first give an overview of multi-channel communication in WSNs and propose the classification of existing multi-channel MAC protocols for WSNs. Then, we describe briefly three representative protocols by stating their essential behavior and(More)
Localization in Wireless Sensor Networks (WSNs) refers to the ability of determining the positions of sensor nodes, with an acceptable accuracy, based on known positions of several anchor nodes. Among the plethora of possible localization schemes, the Received Signal Strength (RSS) based range-free localization techniques have attracted significant research(More)
The sensor node localization with an acceptable accuracy is a fundamental and important problem for location-aware applications of Wireless Sensor Networks (WSNs). Among numerous localization schemes proposed specifically for WSNs, the Received Signal Strength (RSS) based range-free localization techniques have attracted considerable research interest for(More)
Deflection routing, characterized by routing simplicity and minimal in-router buffer resources, has recently emerged as a promising approach for improving power and area efficiency of on-chip networks. With this routing strategy, packet contentions in routers are resolved by intentionally misrouting some of packets along unwanted directions instead of(More)
– TDMA-based MAC protocols, in its traditional form, suffer from low channel utilization and high message delay because of a long frame length needed to provide collision-free transmissions. In this paper, we introduce a class of TDMA-based protocols, called reduced-frame TDMA, which allow conflicting slot assignments, but provide every TDMA slot with a(More)
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