1,720,985 research outputs found
Energy/Latency Trade-offs in Geographic Routing for Ultrawideband Wireless Sensor Networks
No full textWireless Sensor Networks (WSNs) may exploit accurate localization capabilities of ultrawideband (UWB) transceivers to improve performance of high layer protocols. We analyze power consumption of a WSN accommodating both communication and positioning into the same UWB transceiver and implementing a geographic routing algorithm, either the Greedy Perimeter Stateless Routing (GPSR) or its energy aware version, the e-GPSR. Power consumption depends on beacon rate for positions' updates, the number of hops to reach the destination and the number of neighbors per node. On the other hand, the beacon rate impacts the reliability of the neighbor lists; the number of hops impacts on the end-to-end latency; the number of neighbors, i.e. the network connectivity, impacts on routing performance. The presented analysis assesses, by means of both theoretical investigations and simulation results, the main trade-offs between power consumption and latency that can be applied to obtain the best achievable performance
Performance Trade-Offs in Energy-Aware Geographic Routing for Low-Data Rate Location/Tracking Applications
No full textPerformance trade-offs of an energy-aware version of a location-based reactive multi-hop protocol, namely
the Greedy Perimeter Stateless Routing, are investigated, by means of extensive dynamic simulations of a low-data rate location/tracking system. As those systems usually implement the simplest aloha MAC, it is necessary to keep at the minimum
the updating beacon traffic. Balancing this constraint with the opposite necessity of the proposed routing of using up-to-date information about neighbor nodes, we show that a maximum performance exists for an optimal value of beacon repetition
rate, that varies with the nodes’ mobility degree. We also assess the effectiveness of the use of positions’ prediction models
Routing Design for UWB Sensor Networks in Industrial and Logistics Scenarios
No full textUWB technology enables accurate positioning. The integration of communication and location-tracking capabilities will strongly enhance performance and enlarge the application field of UWB systems. Location-based routing protocols may be more efficient and robust than other routing strategies. In this
paper we propose an enhanced “energy-aware” version of a well established location-based reactive multi-hop protocol, namely the Greedy Perimeter Stateless Routing (GPSR) algorithm. The performance of this novel routing scheme is investigated by means of extensive dynamic system simulations. The design parameters
of the e-GPSR are optimized for industrial and logistics scenarios
Measurements of the performance degradation of UMTS receivers due to UWB emissions
No full textResults of experimental trials performed to assess the coexistence of the UMTS systems and the UWB emissions are presented. The performance degradation of the UMTS system vs. the in-channel UWB interference power has been measured in terms of the bit error rate and the noise rise
Impact of Mobility on Geographic Routing
No full textA new location-based reactive multi-hop protocol, namely the e-GPSR algorithm, is tested for the use in UWB sensor networks for logistic applications. Specifically, the impact of location information errors on the algorithmpsilas performance is investigated when a Manhattan mobility model is assumed and a suitable position prediction model is introduced. The performance improvement produced by the combination of the e-GPSR algorithm with the prediction model is measured in terms of increased success delivery rate and reduced failures obtained by means of extensive system simulations
e-GPSR for LDR-L/T UWB Sensor Networks
No full textRouting performance is evaluated for a network of low data rate location/tracking UWB sensors that implement the energy-aware greedy perimeter stateless routing (e-GPSR). Sensors have both location/tracking and communication capabilities, that allow the use of a geographic reactive multi-hop routing protocol, like the e-GPSR. In order to efficiently manage the tasks of ranging and data transfer, a particular MAC scheme is adopted. Different degrees of connectivity and different densities of anchors and mobile nodes are considered in the analysis. A performance improvement is given by an increase of the number of anchors, especially in situations of scarce connectivity
Impact of mobility on geographic routing
No full textA new location-based reactive multi-hop protocol, namely the e-GPSR algorithm, is tested for the use in UWB sensor networks for logistic applications. Specifically, the impact of location information errors on the algorithm's performance is investigated when a Manhattan mobility model is assumed and a suitable position prediction model is introduced. The performance improvement produced by the combination of the e-GPSR algorithm with the prediction model is measured in terms of increased success delivery rate and reduced failures obtained by means of extensive system simulations. © 2008 IEEE
Routing optimization for underwater optical networks in swarm configuration
No full textUnderwater wireless networks have been deeply studied in the last few years. Particular attention has been recently devoted to swarm networks, which can operate and take decision in collaborative manner. In swarm networks, the limited distance between nodes can be exploited by implementing optical links when the characteristics of the communication channel make it possible. With respect to acoustic communications, that solution can lead to an increase in data rate, to the absence of signal latency and to significant energy saving. A performance analysis is presented for an underwater swarm network in case of optical link among mobile nodes, considering LED optical transmitter and typical parameters for the communication channe
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