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In this paper we consider a spin-based multi-processor locking protocol, named the Multiprocessor resource sharing Protocol (MrsP). MrsP adopts a helping-mechanism where the preempted resource holder can migrate. The original schedulability analysis of MrsP carries considerable pessimism as it has been developed assuming limited knowledge of the resource usage for each remote task. In this paper new...
Support for exclusive access to shared (global) resources is instrumental in the context of embedded real-time multi-core systems, and mechanisms for achieving such access must be deterministic and efficient. There exist two traditional approaches for multiprocessors when a task requests a global resource that is locked by a task on a remote core: a spin-based approach, i.e. non-preemptive busy waiting...
This paper studies Trust in real-time distributed database systems. High availability and fault-tolerance are important aspects of these real-time systems and are commonly achieved by replication. Different existing replication techniques are compared in this paper in terms of implementation and limitations. Also, a new replication technique; TIRS; is proposed that relies on Trust when reading or...
Radio frequency identification (RFID) sensors are increasingly recognized as the way for achieving smart environment monitoring. Real world industrial applications, such as multiobjects orientation detection, motion sensing as well as monitoring in harsh environment require real-time operation and fast responses for control decisions. This paper examines the timing analysis of UHF networked RFID sensors...
The search for service providers (e.g., ambulance, fire truck, etc.) after a disaster, must take place within ashort time. Therefore, service discovery protocol which looks forproviders that can attend victims, respecting time constraints, iscrucial. In such a situation, a commonly solution for ensuringnetwork connectivity between victims and providers is ad hocnetworks (MANET), composed by battery-operated...
We first propose a framework which utilizes vehicular delay tolerant network (DTN) to form a vehicular cloud in order to provide information exchange without communication infrastructure. The framework does not rely on cellular network and therefore provides an approach which is suitable for post-disaster communication where cellular network is unavailable or severely congested. The paper also proposes...
This paper proposes Floodless Carrier-grade Scalable Ethernet Architecture (FCSEA) as a completely floodless enhancement of EtherProxy to meet scalability and protection switching requirements of Ethernet in carrier networks. FCSEA uses a priority based cache retention principle, exploits attempt from end node/host to verify connectivity during commissioning and intercepts dynamic configuration (DHCP)...
With the increasing development of network technologies and the growing number of new service requirements in Internet, the problem of service extensibility in traditional network is being challenged constantly. Thus, we propose the extensible network service model. In this paper, the basic principle of the extensible network service model is described firstly. Then, on the basis of service composition...
This paper mainly analyzes the impact of the maximum transmission unit (MTU) on application performance by using OPNET. Simulation models are created and amount of experiments for typical FTP applications are conducted. Based on comparisons with different MTU value and different scenarios corresponding to the FTP upload response time, optimal settings are found.
Ethernet Powerlink (EPL) is an industrial Ethernet networking solution commonly used as a communication network in distributed control and automation systems ranging from simple I/O to highly complex motion control applications. The PollResponse Chaining (PRC) mechanism is a new EPL standard feature aimed at increasing the network performance when nodes exchange small amount of data, especially if...
Partitioned fixed priority scheduling is one of the most comprehensively chosen predictable scheduling in practice. The FMLP+ developed in recent years is a better protocol, which ensures asymptotically optimal O(n) maximum priority-inversion blocking. The constraints under several protocols besides the FMLP+ can be exploited to gain the bound on maximum blocking time. However, the blocking time bounds...
The paper focuses on the video publishing on the rented server. When the publisher publishes pre- recorded videos, he has to select a server from many server services in the Internet. In order to allow publishers themselves to select the optimal rented server (with the fastest response) in the Internet to publish the pre-recorded video, some indicators for selection are required. This study first...
All major real-time suspension-based locking protocols (or semaphore protocols) for global fixed-priority scheduling are reviewed and a new, unified response-time analysis framework applicable to all protocols is proposed. The newly proposed analysis, based on linear programming, is shown to be clearly preferable compared to all prior conventional approaches. Based on the new analysis, all protocols...
FlexRay is a communication protocol that combines event- and time-triggered communication to increase the schedulability and flexibility of message scheduling in current car systems. Because safety and reliability are particularly crucial for automotive systems, the worst-case response times of signals transmitted by electronic control units must be under their deadlines. To increase the bandwidth...
Controller Area Network (CAN) is a widely used fieldbus protocol in various industrial applications. In order to understand the network behaviors under errors for optimal design of the networked control systems, the messages response time (MRT) of the CAN nodes need to be analyzed. This paper presents a novel analysis method to estimate the MRT delay distribution for CAN networks that operating on...
A vehicular ad hoc network (VANET) is composed by a group of communicating vehicles without the use of any infrastructure. The services provided by a VANET range from enhancing safety on an accident scene to advertisements of local services or events. Time-critical applications require packets to be broadcast with the lowest possible delay. In this paper, we propose Fast-OB-VAN, which is a broadcast...
Resource efficient approaches are of great importance for resource constrained embedded systems. In this paper, we present an approach targeting systems where tasks of a critical application are partitioned on a multi-core platform and by using resource reservation techniques, the remaining bandwidth capacity on each core is utilized for one or a set of non-critical application(s). To provide a resource...
The use of centralized signal processing for dense urban mobile networks is gaining interest both in research and in industry. Gathering most of the base station functionalities in a processing pool would enable capacity sharing and the implementation of advanced techniques such as coordinated multi-point. Nevertheless, this puts stringent requirements on the network interconnecting the processing...
One cannot think of living in this world without Internet which one has to visit everyday for e-mail checking, booking air ticket, purchasing items from online stores etc. A client server environment can be compared to Internet access by users. Where the services are hosted on web server and users are considered as clients. Anyone who visits a web site wants a reasonably good response time. But due...
This paper presents design and performance enhancement of the monitoring system of a power plant, specifically based on Modbus/TCP configuration. Also, Establishing the Modbus/TCP connection and method of obtaining the redundancy and cycle time calculation is presented. The approach is based on the Siemens PLC S7-417H and the related hardware (Step7) and software (process Control System: PCS7) to...
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