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The paper describes the co-simulation platform that integrates a mobility simulator adapted to represent e-mobility with a dynamic simulator of the power distribution network and with an UMTS communication network simulator. The platform appears useful in order to assess the effects of the transients caused by the concurrent charging of a large number of electric vehicles to the operating conditions...
Spectrum sensing allows the cognitive radio (CR) devices to determine the presence of licensed users in the chosen spectrum band. Though several sensing methods based on energy detection and cyclostationary feature extraction have been proposed, they fail to account for the location-specific results, and provide no incentive for the node to perform sensing at the cost of its own data throughput. In...
Recent studies demonstrate that Cognitive Radio (CR) technology can increase the spectrum efficiency of wireless systems, provided that the activity of primary users (PUs) must be carefully protected. For this reason, several sensing schemes leverage the cooperation among nodes to increase the accuracy of PU detection. In this paper, we propose to employ the CR principles in the vehicular environment...
Due to their self-configuration and auto-configuration properties, Wireless Mesh Networks (WMNs) are expected to support a plethora of applications, including traditional Internet services and novel multimedia applications. Service differentiation is needed to support applications with different Quality of Service (QoS) requirements. In this paper, we propose a novel cross-layer framework that provides...
Multi-radio multi-channel technology is a viable solution to increase the capacity of wireless mesh networks (WMNs). On the one hand, the interference can be reduced by tuning neighbouring nodes on different channels. On the other hand, multi-hop coordination schemes that exploit the presence of multiple radios can be deployed at the MAC layer. In this paper, we propose a novel cross-layer architecture...
Multi-radio wireless mesh networks (MR-WMNs) are being increasingly deployed to provide affordable Internet access on large residential areas. MR-WMNs allow the supported mesh clients (MCs) to access the Internet gateway by multi-hop packet forwarding over the mesh routers (MRs), which can be equipped with multiple radio interfaces. In such a scenario, the routing protocol should (i) decide the address...
The usage of sensors is emerging in the nowadays scenario where safety related applications are more and more used. These applications have timing constraints that need to be met by the control system. Thus, guaranteeing timeliness properties is considered a key challenge for research on wireless sensor networks. Among the different components that need to address this problem, we focus on the communication...
We propose Connection then Credits (CTC) as a new end-to-end flow control protocol to handle message-dependent deadlocks in networks-on-chip (NoC) for multicore systems-on-chip. CTC is based on the classic end-to-end credit-based flow control protocol but differs from it because it uses a network interface micro-architecture where a single credit counter and a single input data queue are shared among...
We present the aEqualized routing algorithm: a novel algorithm for the Spidergon Network on Chip. AEqualized combines the well known aFirst and aLast algorithms proposed in literature obtaining an optimized use of the channels of the network. This optimization allows to reduce the number of channels actually implemented on the chip while maintaining similar performances achieved by the two basic algorithms...
NoC architectures are considered the next generation of communication infrastructure for future systems-on- chip. Selection of the network architecture and mapping of IP nodes onto the NoC topology are two important research topics. In this paper we compare well known NoC interconnect systems, specifically, Ring, 2d-Mesh, Spidergon and unbuffered Crossbar using theoretical uniform traffic based on...
This paper illustrates the effects of the hyper-threading processor technology on the runtime performance of a parallel and distributed simulation middleware. A preliminary analysis of the middleware design and execution parameters is given to identify the tuning parameters and to evaluate the scalability of parallel simulation. A real testbed scenario has been illustrated, based on the ARTIS parallel...
NoC architectures can be adopted to support general communications among multiple IPs over multi-processor systems on chip (SoCs). In this work we illustrate the modeling and simulation-based analysis of some recent architectures for network on chip (NoC). Specifically, the ring, spidergon and 2D mesh NoC topologies have been compared, both under uniform load and under more realistic load assumptions...
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