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Ethernet is a popular technology for industrial networking thanks to its low cost and high bandwidth. The current proposals to achieve real-time communication over Ethernet do not consider the determinism of the control applications resulting in inefficient use of bandwidth resources. We proposed a protocol stack architecture that works with standard Ethernet to address this problem. This paper describes...
As the demand for real-time data services (e.g., e-commerce or on line auctions) increases, it is desired for a real-time database to increase the timely throughput-the amount of data processed in a timely manner. As the timely throughput of a centralized real-time database is limited, it is desired to federate a set of real-time databases to increases the timely throughput. However, related work...
Ptides, a programming model for distributed real-time embedded systems, was proposed previously. In this work, we focus on a work flow that applies Ptides in a single-CPU environment using model-based design techniques. Our work flow starts with a programming environment where a real-time application is expressed as a Ptides model. The model captures both the functionality of the system and the desired...
Due to increased on-chip power density, multi-core systems face various thermal issues. In particular, exceeding a certain threshold temperature can reduce the system's performance and reliability. Therefore, when designing a real-time application with non-deterministic workload, the designer has to be aware of the maximum possible temperature of the system. This paper proposes an analytic method...
Several recent works consider the problem of temperature-constrained scheduling of jobs. In such attempts, speed of the processor and the execution of jobs is software-controlled such that temperature and performance constraints are met. An alternative approach is to use measurements from temperature sensors to actuate the speed of the processor as a feedback control loop. Though such a solution explicitly...
In this paper we present an approach for the self reconfiguration of distributed micro-controllers for increased fault tolerance. Based on a modified distributed system topology utilizing a time division multiple access (TDMA) protocol, i.e., Flex Ray, we present a self-organized distributed coordinator concept which performs the self-reconfiguration in the case of node failures. We introduce a distributed...
In this continuous fast world of mobile devices there is always a growing demand of high rate services. So a call has to be continuous with same data rates during a handoff. This paper deals with a novel approach DBA-CAC to reduce the call dropping probability while ensuring QoS demands are met in LTE wireless networks. The reduction is based on Adaptive Call Admission Control (Ad-CAC) scheme which...
In recent years, due to its cost-effectiveness and ease of deployment, high latency network such as VSAT satellite network has been widely used to interconnect with people especially those in the rural areas. Since the VSAT satellite channels are widely used for real-time interactive multimedia applications that require relatively high bandwidth, this have led to greater demand for network bandwidth...
Based on the Instantaneous Stopped Delay (ISD), this paper proposed a novel closed-loop feedback signal control strategy, which takes the total amount of ISD (ISD Total) as input detector data for measurement frame-by-frame in traffic flow video, and realizes real-time switches of the signal status when the amount reaches the threshold, and adaptively distributes the green interval to the most needed...
In this paper, we study the performance of some of the key scheduling algorithms such as Proportional Fair Scheduler, Modified Longest Weighted Delay First and Exponential Rule. We also propose a new algorithm called EXPQW, a variant of the Exponential rule which assigns weights to the subscriber stations based on their queue length and waiting time thereby ensuring fairness and quality of service...
Abstract - Wide Area Measurement System has increasingly become an important part of wide-area interconnected power system, the reliable transmission of real-time measurement data is essential. This paper creates WAMS delay model from perspectives of the stratification of system functionality and communication structure. It also analyses influences to WAMS communication delay caused by different protection...
As Internet Protocol version 4 (IPv4) addresses deplete, Internet Protocol version 6 (IPv6) is introduced to alleviate the depletion with introduction of much needed functionality in security and so much more. Quality of Service (QoS) has been one of the aspects taken into consideration for improving network performance such as Packet Delivery Fraction (PDF), average End-to-end Delay and throughput...
This paper presents a method for time base synchronization between independent nodes which communicate over a wireless medium. It is shown that the malicious effects of multipath propagation are minimized and precise time base synchronization is achieved.
This paper presents a method for time base synchronization between independent nodes which communicate over a wireless medium. It is shown that the malicious effects of multipath propagation are minimized and precise time base synchronization is achieved.
With the wireless landscape being rather heterogeneous, handover between different network technologies, so-called vertical handover, becomes key to a continued success for wireless Internet access. Recently, an extension to the Stream Control Transmission Protocol (SCTP) -- the Dynamic Address Reconfiguration (DAR) extension -- was standardized by the IETF. This extension enables the use of SCTP...
In wireless sensor networks (WSNs), the real-time data dissemination protocols exploit the spatiotemporal communication approach which forwards data at the delivery speed calculated with the desired time deadline and the end-to-end distance. However, the protocols do not focus on the reliable communication. Recently, MMSPEED is proposed for both reliable and real-time data delivery based on multipath...
Quality of service (QoS) is an important issue in the deployment IEEE 802.16 networks with real-time and non-real-time traffic integration. IEEE 802.16j is an extension of IEEE 802.16 to support relay transmission. In this paper, we propose a dynamic hybrid distributed scheduling mechanism (DHSM) for IEEE 802.16j networks with non-transparent relay stations. First, we define a suitable priority for...
This paper proposes a jitter buffer for IP-based network which regulates packet-receiving interval. The proposed method utilizes a PD controller to adjust queue length of the jitter buffer to avoid overrun and underrun. In addition, the derivative value of packet-receiving interval is converged to zero by a low-pass filter. Proposed jitter buffer improves control performance of feedback control systems...
Owed to its regular structure and rich interweaving, facilitating simple and efficient dissemination and aggregation of data, the hypercube is an effective and popular interconnection network for parallel and distributed computing. Its short paths make it suitable for latency critical real-time applications such as live streaming or estimation of system state vectors, including object tracking or...
This paper presents a DiffServ based adaptive QoS model for real-time interactive traffic in constrained bandwidth IP network without over provisioning the users. A WRR based QoS scheduling algorithm has been implemented to allocate the network resources to the users. A tuning parameter for VBR real-time traffic is also introduced in order to provide fair performance to the non real-time traffic as...
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