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In this paper, we present a data collection protocol for wireless sensor networks employing a number of mobile sinks. For satisfying timely delivery of sensory data to mobile sinks, sinks are forced to visit only an appropriate number of rendezvous nodes while the remaining nodes send their data through multi-hop communication toward these nodes. The proposed approach achieves prolonged network lifetime...
Efficient event reporting is of vital importance in wireless sensor networks (WSNs). This is especially true in critical-time applications, where ensuring an adequate report latency allows a proper reaction from the network to the occurring phenomena. Despite a QoS analysis based on mean report latency is clearly insufficient for critical-time applications, it is oftentimes presented as the main performance...
This paper considers the problem of distributed neighbor discovery in multi-channel wireless networks. We propose a protocol in which nodes randomly select a channel and decide whether to transmit or listen for neighbor discovery beacons. When nodes transmit, they use epidemic information dissemination to spread knowledge about all the nodes they have discovered so far. Theoretical guarantees on discovery...
Dense small cell (SC) deployments are expected to help handling the explosive growth of mobile data usage. However, the backhaul of these deployments will face several challenges where point-to-point (PTP) and point-to-multipoint (PMP) wireless technologies will be combined forming multipoint-to-multipoint (MP2MP) wireless mesh backhauls. In this context, routing and load balancing solutions will...
Apart from static deployments, sensor nodes in Wireless Sensor Networks (WSNs) are unaware of their location information. In order to estimate their actual or relative positions with respect to other nodes, they are required to self-localize themselves by collecting information from their environment. However, due to the high dynamism and the noise introduced by the WSN environment, self-localization...
A team of robots (also called actors) in Wireless Sensor and Actor Networks (WSANs) may not be able to optimally cover an area so that after an event is reported by a sensor all robots may not be quickly reachable for possible action in time. Furthermore, sensors may not be able to immediately deliver a report to a nearby robot. In this paper, we focus on dynamic location service to deal with sequence...
A Body Area Network (BAN) is a radio standard for wireless connectivity of wearable and implantable sensors located inside or in close proximity to the human body. Medical and some other applications impose stringent constraints on battery powered BAN reliability, quality of service, and power consumption. However, lack of coordination among multiple colocated BANs in the current BAN standard may...
In this paper we consider the 1-movable dominating set problem in wireless sensor networks (WSNs), motivated by applications of WSNs such as detection of environmental activity, surveillance, area monitoring and attaining small degree of fault tolerance in such applications. To find a minimum 1-movable dominating set is shown to be NP-complete. Hence, in this paper we design centralized and distributed...
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