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In this paper, we propose a scheduling algorithm for mobile WiMAX networks that distributes dynamically the bandwidth among service flows while giving real-time packets more chances to satisfy their QoS requirements. The scheduling in the proposed algorithm is assisted by the subscriber stations, hence requiring two-schedulers, a scheduler at the BS and another one at the SS, where preemption is applied...
VoIP systems have to face far tougher security threats than their underlying IP infrastructure. In fact, a security hole in a VoIP infrastructure could bring to a major security failure for the interconnected PSTN network(s), usually regarded as a reliable and secure domain. This is the reason why before connecting a private VoIP network to the carrier infrastructure, a great number of tests have...
In NoCs often several flows are merged into one aggregate flow due to heavy resource sharing. For strengthening formal performance analysis, we propose an improved model for an output flow of a FIFO multiplexer under aggregate scheduling. The model of the aggregate flow is formally proven and can serve as the basis for a stringent worst case delay and buffer analysis.
Automotive functions require validation of the underlying network in advance. Especially driver assistance functions may require hard time bounds concerning their communication infrastructure. In several works analytical models have been introduced, enabling the calculation of worst case delays for realtime applications using Ethernet as communication technology. On the other hand considerable effort...
We describe an algorithm for optimistic concurrency control suitable for governing transactions operating on databases residing on resource constraint devices. We are concerned with real-time applications that utilize such devices in a computationally demanding manner (e.g., gaming). Therefore, increasing energy efficiency and reducing latency are primary goals for our algorithm to afford higher overall...
In the Long Term Evolution (LTE) network, buffer overflows often occur in the evolved Node B (eNB) when dealing with the traffic bursts from the wired part due to restricted bandwidth or environmental interferences in the wireless part. In this paper, a novel approach is proposed to protect the buffer from overflow by appropriately controlling the advertisement window to enhance the Transmission Control...
This paper presents framework and tools for exploiting simulation, in various form, in support of design of Smart Grids. The novel capabilities that the simulation should possess are presented with focus on the integration of communications in the design process. Sample design applications are presented. The design process is then outlined at the conceptual level.
VHF radio systems commonly used to support search and rescue activities after disasters limit the flow of information among response teams deployed in the field. It generates islands of information that jeopardizes the coordination and effectiveness of the response activities. This article proposes a communication model that uses opportunistic networks and real-time messages delivery to help address...
In this paper, we propose a mechanized framework for formal verification of real-time systems based on predicate abstraction in PVS (Prototype Verification System) based on timed automata model. This framework is composed by two parts: one for modeling the real-time system and its abstract system which is abstracted from concrete time system by predicate abstraction and over-approximation techniques,...
Achieving the required Quality of Service (QoS) is an important requirement in a communication network. In recent years, VSAT technology has become one of the popular means to interconnect with people around the world. However, VSAT satellite network has high latency constraint and provides low and limited bandwidth. These limitations caused network congestion when the bandwidth-intensive real-time...
Next Generation Wireless Networks (NGWNs) focus on convergence of different Radio Access Technologies (RATs) providing good Quality of Service (QoS) for applications such as Voice over IP traffic (VoIP) and video streaming. The voice applications over IP networks are growing rapidly due to their increasing popularity and cost. To meet the demand of providing high-quality of VoIP at anytime and from...
In this paper we propose the use of a coordination layer to handle real-time communication in infrastructured WiFi networks. This layer combines a TDMA scheme with a traffic separation mechanism (FCR MAC), which enables the prioritization of real-time (RT) traffic over uncontrolled (external) traffic sources. The target of this paper is to assess the behavior of this coordination layer when supporting...
Real-time networked control systems (NCSs) over data networks are being increasingly implemented on a massive scale in industrial applications. Along with this trend, wireless network technologies have been promoted for modern wireless NCSs (WNCSs). However, popular wireless network standards such as IEEE 802.11/15/16 are not designed for real-time communications. Key issues in real-time applications...
The paper presents preliminary results of a European project, with the goal to design an integrated system for delivering real-time travel and traffic information on mobile navigation devices. The service matches together multiple data formats and operates via a Common Agreed Interface (CAI) to achieve data fusion from different information sources. The updated information is used to create specific...
Wireless LANs carry a mixture of traffic, with different delay and throughput requirements. The usual way to provide low-delay services is to give priority to such traffic. However this creates an incentive for throughput sensitive traffic also to use this service, which degrades overall network performance. We propose to allow applications to trade off delay for throughput, without giving preference...
The paper presents a new embedded networked controller designed for vehicle driveline oscillations damping. To benefit of increased safety and predictability, the controller's algorithm is developed under OSEK/VDX real-time operating system. The implementation is tailored to fit available embedded architecture's resources. Main challenge refers to the configuration of accepted delays, taking into...
This paper introduces a platform for real time simulation and its contribution towards smart grid related research, with focus on Plug-in Hybrid Electric Vehicles (PHEV) charging stations. The current system is able to simulate in real time key elements of a smart grid such as: high speed power electronics, distributed energy resources (DER), and communication networks. A description of the platform...
At present, Machine-to-Machine (M2M) communication have become new services with large market potential, and show quite different characters compared with the traditional Human-to-Human (H2H) communications. It is a big challenge to guarantee the Quality of Service (QoS) for M2M services in traditional telecomm. network. This paper focuses on the QoS categorization of M2M services. Based on the analysis...
According to the IEEE 802.16j standard, a Mobile Station (MS) connects with a Multi Relay-Base Station (MR-BS) through a Relay Station (RS). Because there could be multiple paths between a MS and a MR-BS, it is important for a MS to select an appropriate path to transmit data. Although many path selection schemes have been proposed, they are designed for delivering real-time data rather than best-effort...
Considering the chaotic characteristics of ship rolling time series, the new real-time forecasting method is proposed to further enhance accuracy and real-time of the prediction model based on support vector machines in the prediction of ship rolling motion, which utilizes phase space reconstruction theory of chaotic systems and online LSSVM. Delay time and delay time window are estimated by C-C method,...
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