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A managed wireless mesh for infrastructure-level, stable regional mesh network has been studied. NerveNet, which we have been proposing, is a concept of future regional platform network that covers local regions and provides various context-aware services with the shared use of sensors and actuators. The managed wireless mesh developed for materializing NerveNet features auto-configuration of multiple,...
This paper presents the vision shared by partners from the CELTIC project HOMESNET about Femto Base Station deployed at Home, i.e. Home Base Station (HBS). Three of the main aspects under study are presented. The challenges in HBS self-organizing, including femto-macro coexistence, are explained and methodology for successful self-organization is proposed. To achieve very low radio emission at home...
Future pervasive communication systems requirements for highly performing, flexibly deployable and cost/energy-efficient services and applications are expected to revolutionize the way we design, optimize and use wireless networks. From a cellular perspective, the emphasis is placed on achieving ubiquitous and reliable real-time data communications at cell-edge, as articulated in ITU's IMT-Advanced...
This paper studies the performance of a superposition based approach for multi-user access in the uplink of a wireless cell. The approach uses non-orthogonal signaling and multi-user detection on top of an orthogonal multiple-access method like OFDMA. Path losses depending on the distance between a terminal and the base station and cancellation errors during multi-user detection are taken into account...
Wireless location refers to obtaining the position information of a mobile subscriber in a cellular environment. Such positioning information is usually provided in terms of geographic coordinates of the mobile subscriber with respect to a geographic reference point. Wireless location finding has emerged as an essential feature of cellular systems and has many potential applications in areas such...
Indoor Wireless sensor networks require a highly dynamic, adaptive routing scheme to deal with the high rate of topology changes due to fading of indoor wireless channels. Besides that, energy consumption rate needs to be consistently distributed among sensor nodes and efficient utilization of battery power is essential. If only the link reliability metric is considered in the routing scheme, it may...
As the traffic grows rapidly in wireless communication, the spectrum becomes scarce. The current inefficient fixed spectrum allocation schemes will not satisfy the growing spectrum demand. This paper proposes a double auction based dynamic spectrum sharing scheme for multiple operators adopting OFDMA in the downlink. More specifically, this scheme allows free subcarriers trading between operators...
In current wireless standards like 3GPP LTE or IEEE 802.16 / WiMAX multiple access is based on orthogonal signalling using single-carrier frequency-division multiple access (SC-FDMA) or orthogonal frequency-division multiple access (OFDMA). Links between a base station and different terminals use mutually orthogonal radio resources. This paper studies potential gains in average cell throughput by...
In this paper we develop a discrete and distributed optimization framework that maximizes the overall spectral efficiency of heterogeneous networks while ensuring a minimum fairness among users. We split the problem into two subproblems: the first one is handled by the users and consists in a transmission by each user of a minimum rate requirement to the base stations and the second is the resource...
In recent years, ad-hoc network technology consisting of not access points and base stations but of wireless nodes has gained attention because the disaster scene requires quickly construction of the network. Usually the aim of routing protocol in ad-hoc network is to provide the stable network service. In order to maintain the network, node must communicate with each other in exchanging their routing...
Among civilian communication systems, vehicular networks emerge as one of the most is convincing and yet most challenging instantiations of the mobile ad hoc networking technology. Towards the deployment of vehicular communication systems, security and privacy are critical factors and significant challenges to be met. This Vehicular communication (VC) system has the potential to improve road safety...
The use of wireless technology for intra-vehicle communication is becoming possible in replacing in-scalable, high weight and high manufacture cost automotive wired networks. Ultra-Wide Band (UWB) is emerging as an ideal alternative for implementing an Intra-Vehicle Wireless Sensor Network (I-VWSN) due to its very high data rate and low power consumption. However, the current IEEE MAC Layer Protocol...
In recent years the onboard storage on wireless sensor motes has grown very dramatically, going from Kilobytes (KB) of available space to Gigabytes (GB). This massive increase has primarily come from the addition of support for micro or mini Secure Digital (SD) flash cards on the nodes. This extra storage capacity has led to new use cases for sensor motes which result in fewer data transmissions as...
In this paper, we consider the standard discrete-time slotted ALOHA with a finite number of terminals with infinite size buffers. In our study, we jointly consider the stability of this system together with the physical layer security. We conduct our studies on both dominant and original systems, where in a dominant system each terminal always has a packet in its buffer unlike in the original system...
In wireless sensor networks that consist of a large number of low-power, short-lived, unreliable sensors, one of the main design challenges is to obtain long system lifetime, as well as maintain sufficient sensing coverage and reliability. A critical issue in wireless sensor networks is represented by the limited availability of energy within network nodes; therefore making good uses of energy is...
Clustering algorithms in wireless sensor network are used to save energy consumption. Existing clustering algorithms did not consider the energy optimization inside the clusters and they created new clusters once the cluster head of a cluster becomes dead. The removal and creation of new clusters create communication overhead. Here we propose a clustering algorithm for specific area of deployment...
Sensing connectivity and sensor coverage in sensor networks are two fundamental issues, which have been extensively addressed in the literature. The reliability of wireless sensor networks (WSN) depends on both network connectivity and sensing coverage. Most existing work on sensing coverage has focused on the full coverage problem. However, in some application scenarios, full coverage is either impossible...
In this document, we verified the application by implementing the unmanned operation of system using the development of TOA application method. Applying wireless technology of sub equipment in signal system related to the safety operation is limited due to the difficulty of confirming the Fail-safe. However, we confirmed that it would be economical of the cost which could be required to maintain the...
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