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In this paper we focus on wireless sensor networks deployed to cover some given Points of Interest (PoIs), achieve connectivity with the sink and be robust against link and node failures. The Relay Node Placement problem (RNP) consists in minimizing the number of relays needed and the maximum length of the paths connecting each PoI with the sink. We propose a solution that determines the positions...
During natural disasters, such as earthquakes, apart of the Internet access infrastructure can be damaged, leaving many users disconnected. At the same time, many peopleneed to communicate to find their relatives and receive officialnotifications about the current situation. This paper presents anevaluation of different techniques for extending network coveragein such scenarios. We use real-world...
In a Wireless sensor network, considering the limited power of sensors battery, it is possible for nodes to damage during spreading for a large number of nodes. In such a network, the nodes are energy constrained and cannot be recharged again. Therefore, it is clear that the optimal protocols are required to reduce the energy consumption and increase the lifetime. One of the methods in this area is...
Coverage and connectivity are two important performance evaluation indices for wireless sensor network (WSNs). In this paper, we focus on the connected target k-coverage (CTCk) problem in heterogeneous wireless sensor networks (HWSNs). A distributed connected target k-coverage algorithm (DCTCk) is proposed in order to generate connected cover sets for energy efficient connectivity and coverage maintenance...
The recent advancements in the field of Wireless Sensor Networks (WSN) make the sensors smaller, cheaper and more energy efficient. These innovations made it attractive to use sensor networks in new applications like Border monitoring, Railway track monitoring, Oil and Gas pipeline monitoring etc. In the above mentioned applications, a common characteristic is their linear topology. Since last few...
Additional relay nodes (RNs) can be deployed within a partitioned Wireless Sensor Network (WSN) to restore connectivity among the partitions. In the case of lack of sufficient RNs to link all the partitions, some of the RNs can act as mobile data collectors (MDCs) to visit partitions for providing intermittent connection for the nodes. Determining the number of MDCs and stationary RNs is a challenge...
WiMAX is an IEEE802.16 standard that provides a high speed transmission with wide coverage range. In IEEE 802.16j, the multiple Relay Stations (RS) are added to employ multihop links for WiMAX systems to extend coverage range and capacity. Many works in literature concern the RS locations based on the effective cost and the optimum user capacity. Most of them assumed the lossless transmission between...
Future cellular systems demand higher throughput as an important requirement, along with smaller cell sizes to characterize the performance of network services. This paper purposes a way to optimize the multihop cellular network (MCN) deployment in LTE-A/Mobile WiMAX broadband wireless access systems. A simple way to optimize the MCN is to associate direct and multihop users based on maximum channel...
Wireless sensor networks in the cluster algorithm use multi-hop style of communication, close to the sink node of the cluster head node transmit a lot of data which led to excessive energy consumption, the node is easily failure, finally network partitioning. This paper introduces the concept of the node load index and presents a demand-based load balancing algorithm for wireless sensor networks for...
To achieve scalability, a few resource-rich heterogeneous nodes are scattered in a wireless sensor network consisting of a large number of energy-constrained sensor nodes. Heterogeneous nodes are equipped with powerful radio transceiver and their main task is to organize a backbone communication network and to relay data to the sink. For the scenario, this paper proposes a coverage problem which maintaining...
Multihop techniques are known as a practical solution for covering huge radio cell areas when there are only very few base stations (BS). This is the case when fiber access is limited and BS CAPEX and OPEX are very expensive. For WiMAX and 3GPP-LTE it is possible to operate relay stations which are only fed over the air link. While having some inherent overhead due to increased radio resource usage,...
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