The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
This paper presents an empirical study of the effects of the channel occupation on the consumption of actual IEEE 802.15.4/ZigBee motes. The study is focused on the current demanded by a sensor node in a simple beaconless star topology when the CSMA contention algorithm introduces idle times in the activity of the radio transceiver. For this purpose, the developed testbed permits to define the probability...
In this paper, we formulate multi-channel assignment in Wireless Sensor Networks (WSNs) as an optimization problem and show it is NP-hard. We then propose a distributed Game Based Channel Assignment algorithm (GBCA) to solve the problem. GBCA takes into account both the network topology information and transmission routing information. We prove that there exists at least one Nash Equilibrium in the...
Fast and periodic collection of aggregated data is of considerable interest for mission-critical and continuous monitoring applications in sensor networks. In the many-to-one communication paradigm known as convergecast, we consider scenarios where data packets are aggregated at each hop en route to a sink node along a tree-based routing topology and focus on maximizing the data collection rate at...
Proposed a new topology-control algorithms which is based on k-connectivity. In wireless sensor networks, the existing topology-control algorithms now can not meet the needs of WSN in fault tolerance, connectivity, redundancy and so on. In LKETA, the node deletes redundant edges according to the information of local neighbor nodes, and it adjusts transmission power with the power adjustment algorithm...
Topology control in a wireless sensor network is useful for ensuring that the network remains connected in the presence of nodes that exhaust their energy or become altogether dysfunctional (for whatever reasons). It also ensures that all the link that can be established are energy-efficient links and the nodes utilize their energy fairly. In this paper, we propose a fair and energy efficient topology...
Wireless mesh networks can provide scalable highspeed Internet access at a low cost. Fair channel access among different nodes in the wireless mesh network, however, is an important consideration that needs technological solutions before mesh networks can be widely deployed. Lack of fairness significantly decreases the throughput of nodes that are more than one hop away from mesh gateways. We propose...
This paper analyzes the use of link quality, based on the signal to noise ratio, as a metric to improve routing in multi-hop wireless networks. We compare the behavior and performance with those of other approaches, namely a simple minimum-hop selection process, as well as the expected transmission count (ETX) metric, which has recently gathered relevant attention from the scientific community. We...
Energy consumption in wireless sensor networks is an important topic, given the scarcity of resources of the node platforms. This work analyzes the relation between the increase in lifetime and the connectivity properties of a new topology control mechanism for wireless sensor networks. It is possible to extend the functional lifetime of a network by controlling its topology through a scheme that...
ZigBee-based wireless sensor network is proposed. It employs star topology. The work mode of wake up on-demand is adopted for the essential part of ZigBee WSN in order to enlarge the capacity of the sensor network and to resolve the problem of energy supply. We use the STOP mode, only a very low power transmitter is used to monitor the channel when the sensor node is NOT waken up and the sensor node...
A robust signal forwarding technique for wireless sensor and mesh networks using semidefinite constraints is proposed. The scheme considers a multiple source destination scenario where a set of relays assists forwarding signals from sources to destinations. In our work we consider a realistic environment where actual channel state information (CSI) available to the relays are in error. We propose...
Restricted floating sensor (RFS) is an important model in offshore surveillance and monitoring. However RFS suffers long transmission interval and high-energy consumption. In this paper, we propose an adaptive transmission time control (ATTC) strategy for large scaled restricted floating sensor networks. This mechanism release collisions adaptively according to changeful network topology and the condition...
Nowadays wireless mesh routers are facilitating with more wireless channels than ever because of the advanced wireless communication technologies such as OFDM, SDR and CR(cognitive radio). With multi-radio and multichannel communication capability, spectrum heterogeneity are widely existing in multi-radio wireless systems, such that network performances usually suffer from channel bandwidth and transmission...
The following topics are dealt with: mesh networks; underwater and applications; routing protocols; sensor network security; cross-layer protocols; MANET; topology control; power control and performance evaluation; vehicular ad-hoc networks; relay networks; wireless LAN; fading channels; OFDM; QoS and resource management; resource allocation; MIMO systems; LDPC codes; network and service management.
In this paper we present a novel mathematical approach to evaluate the degree of connectivity of a multi- sink wireless sensor network, where sink and sensor nodes are uniformly distributed over a given region. We consider both unbounded and bounded domains, specifically squares, and the impact of border effects is also shown. Random fluctuations as well as a distance-dependent deterministic path-loss...
We address the problem of ldquocapacity allocationrdquo in wireless mesh networks (WMNs). In the ldquocapacity allocationrdquo problem, the network topology (namely the desired wireless links) and routing are given. The problem then is to assign capacities to different links (which are carved out of the radio capacity of a wireless node) in such a way that the average network delay is minimized. This...
Topology control via per-node transmission power adjustment has been shown effective in extending network lifetime. However, most of existing algorithms construct static topologies which fail to consider the residual energy of network nodes, thus in fact they can not balance energy consumption efficiently. To address this problem, a lightweight distributed topology control algorithm EDTC (Energy-aware...
Over the last years, wireless multihop ad hoc networks have received a tremendous interest from research groups. The major focal point has been the routing protocols, i.e. how to select the best route to send information from any source to any destination. Each node in an ad hoc network may work as a router to relay connections or data packets to their destination. The key issues of ad hoc networking...
Topology discovery in sensor network is useful in any practical deployment of the network. Topology information helps the administrators monitor, debug and perform proactive control and management obtaining topology for dense wireless sensor network is expensive due to limited bandwidth and contention for the wireless channel. In this paper, we consider the problem of efficiently obtaining network...
Indoor localization is an emerging subject in the field of wireless sensor networks (WSNs) and even more in wireless mesh networks (WMNs). Off the shelf solutions are still missing, even though the new IEEE 802.15.4a/ZigBee standard enhances the precision of ranging. This paper describes a hybrid localization approach combining time of arrival trilateration (TOA) as being proposed in the IEEE 802...
Despite availability of multiple orthogonal communication channels on common sensor network platforms, such as MicaZ motes, and despite multiple simulation-supported designs of multi-channel MAC protocols, most existing sensor networks use only one channel for communication, which is a source of bandwidth inefficiency. In this work, we design, implement, and experimentally evaluate a practical MAC...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.