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Pervasive networks formed spontaneously by wireless mobile devices capable of ad hoc communication make it possible to get services from these devices, and to compose them dynamically so as to provide people with new and more sophisticated application services. Discovering, invoking and composing services in such networks are challenging tasks, due to the numerous and unpredictable connectivity disruptions...
Although IEEE 802.11p technology is standardized for road safety and efficiency applications, the channel congestion problem is its key weakness necessitating distributed congestion control (DCC) algorithms on different layers of the communication stack. In this paper, we propose DCC-enabled Contention based Forwarding scheme targeting multi-hop dissemination of Decentralised Event Notification Messages...
To realize a consensus problem based on wireless communications, it is necessary to consider several constraints caused by the natures of wireless communications such as communication error, coverage, capacity, multi-user interference, half-duplex and so on. This work focuses on half-duplex constraint and multi-user interference for a consensus problem and proposes a new Slotted-ALOHA that changes...
Recent studies have suggested that the stability of peer-to-peer networks may rely on persistent peers, who dwell on the network after they obtain the entire file. In the absence of such peers, one piece becomes extremely rare in the network, which leads to instability. Technological developments, however, are poised to reduce the incidence of persistent peers, giving rise to a need for a protocol...
We determine the exact per-user multiplexing gain (MG) of Wyner’s soft-handoff network model when neighbouring transmitters and neighbouring receivers can communicate over rate-limited pipes. The per-user MG is determined, in function of the capacities of these conferencing links and of the maximum number of allowed conferencing rounds. The results reveal a certain duality between transmitter and...
A wireless ad hoc network (WANET) is an effective approach to disseminating digital content without the need for infrastructure networks. It is not only useful in the absence of commodity connections such as cellular networks, but also useful for avoiding overloading those connections in crowded scenarios, an example of which is delivering movie clips throughout spectators in a stadium. However, experiments...
Wireless Sensor Networks need energy efficient protocols for communication and data fusion to consolidate data and prolong the lifetime of the network. In this paper, an adaptive hierarchical clustering and routing method has been proposed. This clustering and routing method is based on maximum bottleneck energy routing (MBER) from a node to the sink. This method favors the routes with the highest...
Mobile Ad-hoc Networks (MANETs) are one possible solution for infrastructure-independent communication in disaster scenarios. In such scenarios, communication is essential to coordinate first responders and safe lives. But mobile nodes in large areas face several challenges related to connectivity, resulting in frequent partitions and intermittent connections. Protocols as well as network access technologies...
A network with densely deployed access points can perform better and more reliably by adapting the transmission parameters like transmission power, minimum size of contention window (cwmin), maximum size of contention window (cwmax) and transmission rate. To understand the impact of these parameters on performance of CSMA-based protocol in a multi-AP network, we are building a testbed called DAPnet...
Devising a protocol for computing the location of a sensor in a wireless sensor network (WSN) is a challenging task. In this paper, we present a protocol for computing the location of a sensor that is part of a WSN. The proposed protocol is based on the extent of the trust contained in the reply messages sent by the neighboring sensors that are either anchors or already localized nodes against the...
Vehicular Adhoc Networks (VANETs) have been attracted a lot of research recent years. Although VANETs are deployed in reality offering several services, the current architecture has been facing many difficulties in deployment and management because of poor connectivity, less scalability, less flexibility and less intelligence. We propose a new VANET architecture called FSDN which combines two emergent...
He Near Field Communication (NFC) technology is very comfortable for the user as communication starts without any further configuration. This property makes the standard well suitable for the use with mobile coupons (mCoupons). The application of mCcoupons is quite a novel issue but is becoming increasingly popular among E-commerce because the extensive use of mCoupons can help consumers to save money...
The paper discusses the deployment of wireless sensor networks for intra-car monitoring and control in various automotive application scenarios. Major challenges consist of enabling robust radio communication protocols for challenging environments like the car body and offering high confidence guarantees on timely data collection and quality. Simulation results are introduced and discussed for radio...
A group of wireless devices with the ability to sense physical events (sensors) or to perform relatively complicated actions (actors), is referred to as Wireless Sensor and Actor Network (WSAN). In WSANs, sensors gather information about the physical events, while actors perform appropriate actions upon the environment, based on the sensed data shared by sensors. In order to provide effective sensing...
Wireless sensor networks are composed of a large number of sensor nodes with limited energy resources. One critical issue in wireless sensor networks is how to gather sensed information in an energy efficient way since the energy is limited. The clustering algorithm is a technique used to reduce energy consumption. It can improve the scalability and lifetime of wireless sensor network. In this paper...
A data discovery and dissemination protocol for wireless sensor networks (WSNs) is answerable for updating configuration parameters of, and distributing management instructions to, the sensor nodes. All existing data discovery and dissemination protocols undergo from two drawbacks. First, they are based on the centralized approach; only the base station can distribute data item. Such an approach is...
Bluetooth low energy (BLE) is a new communication protocol which is suitable for wireless devices that must operate with very low energy and/or harvesting ambient energy. In this paper, a novel technique, which provides efficient operation by adapting BLE protocol in accordance with consumable power limitations, is proposed. The essence of this technique lies in the observation that a considerable...
In this work, an energy efficient routing technique for WSNs is introduced. Here the routes between the source nodes and the base station are formed considering the energy levels of the intermediate nodes. These routes are refreshed dynamically to recover topology changes and to keep the energy level of the nodes close to each other. The technique introduced together with data aggregation are implemented...
This article presents the implementation of an Electroencephalogram — EEG system less susceptible to electromagnetic interference — EMI. The amplification, filtering and A/D conversion are placed directly over each electrode. Due to the local amplification and conversion, the system becomes more resilient to EMI and consequently the results are trustier. It was developed a central chip or hub that...
The introduction of mobile sink to wireless sensor networks (WSNs) can effectively address the hot-spot problem. However, as the sink moves in the sensing area, its location information needs to be broadcasted periodically to ensure network connectivity. This additional location update process will increase communication cost in each sensor node. To deal with this problem, this paper proposes a Square-Based...
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