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Degradation of networking quality is a serious problem for service providers (e.g., on-demand video subscription service) since it causes customer defection in their services and results in a decline of their sales. Insufficient path capacity is one of the typical causes which degrade networking quality. Especially, the recent technical trend to shift virtualized network, in which the network is dynamically...
Design of output feedback model reference adaptive control (MRAC) for a class of systems with input delay based only on the lumped-delays is developed. To overcome the difficulty to directly predict the plant output, a control design is proposed based on new approach. The approach relies on a decomposition of the adaptive control design procedure where a “generalized error”, and auxiliary linear filters...
In this paper, a quality-of-experience (QoE)-based user scheduling scheme for delay-sensitive mobile cloud services (MCS) is proposed. The proposed scheme aims at optimizing the user QoE, which is mainly determined by both the application-level and network-level quality of services. Packet delay, as an essential factor affecting QoE, is discussed under the context of QoE optimization. The optimization...
This paper discusses a control technique that allows for controlling the bi-directional flow of active and reactive power using the DQ theory. Traditionally, this theory is used for three phase systems. Its use in single-phase converters presents a challenge due to the lack of degrees of freedom required for orthogonal systems. In this paper, a few methods for orthogonal system generation are presented...
In this paper, we consider one of the main disadvantages of Ergodic Interference Alignment, i.e., delay. We propose two methods to solve the open problem of finding the best choice of user sets in order to minimize the delay. With these methods we are able to find the best JAP-B scheme which aims to trade off rate for delay in Ergodic Interference Alignment. First, we provide the solution based on...
Delay Tolerant Networks are the kind of networks in which an end-to-end path between any source and destination pair may never exist. In these networks, nodes use store-carryforward mechanism for data transmission. In this mechanism, nodes store the messages in their buffers and carry them to reach the appropriate forwarding chance. Most of the previous efforts on improving the performance of routing...
Mission critical network offers a reliable, delay minimized available communication network that accomplishes a mission for the community. Smart grid is an example of these networks which is a modernized electrical grid that uses communication technologies to gather and act on information. Delay is one of the main requirements of this network that needs to be carefully studied. Considering the vast...
Many machine-to-machine (M2M) applications are characterized by the requirement to support a large number of machines for reporting data back to the aggregator for further data processing. While related work has investigated various access barring and de-prioritization approaches for machine-type communications, they fail to work for delay-sensitive M2M applications, where the random access delay...
Internet of Things (IoT) aims to enable the interconnection of a large number of smart devices (things) using a combination of networks and computing technologies. But an influx of interconnected things makes a greater demand on the underlying communication networks and affects the quality of service (QoS). This paper investigates into the QoS of delay sensitive things and the corresponding traffic...
Reservation systems are generally employed to enforce temporal isolation between applications. In the real-time context the corresponding temporal isolation requires not only the consideration of the direct interference due to execution of higher priority tasks, but also the indirect cost of e.g. cache-related preemption delay. The accounting of this in a server-based implementation of temporal isolation...
In this paper, we first propose a static analysis approach to estimate the maximum value of the worst-case latency of all possible communications in a Chip Multi-Processor (CMP) with a 2D-Mesh Network-on-Chip (NoC), which is called the Worst-case Inter-core Communication Latency (WICL). Then the Hop-based Priority scheduling approach is proposed for a 2D-Mesh NoC to improve its WICL. Our experimental...
Vehicular Ad hoc Networks (VANETs) have gained considerable attention in recent years because of the extensive applications. However, VANETs are confronted with numerous difficulties and challenges, which lead to communication performance degradation and even data delivery failure. In this paper, we propose a new routing protocol called Intersection-based Delay sensitive Routing using Ant colony optimization...
Reliable data transfer for underwater acoustic sensor networks (UASNs) is a major research challenge in applications such as pollution monitoring, oceanic data collection, and surveillance due to the long propagation delay and high error rate of the acoustic channel. To address this issue, an opportunistic data forwarding protocol was proposed which achieves high packet delivery success ratio with...
In this paper, we propose the implementation of PID on Networked Control System (NCS) using Particle Swarm Optimization (PSO) algorithm as tuning method. There are three modification of PSO that used in this paper. The first is Constant Inertia Weight of PSO (CIW-PSO), the second is Linear Difference Weight of PSO (LDW-PSO), and the latest is Random Inertia Weight of PSO (RIWPSO). In the end, we present...
Ethernet AVB is being actively considered by the automotive industry as a candidate for in-vehicle communication backbone. However, several questions pertaining to schedulability of hard real-time messages transmitted via such a switch remain unanswered. In this paper, we attempt to fill this void. We derive equations to perform worst-case response time analysis on Ethernet AVB switches by considering...
One of the challenge issues in network virtualization is the efficient mapping of a virtual network (VN) onto a shared substrate network. The VN mapping problem has been addressed by various researchers. However, these solutions and associated algorithms are only efficient for building unicast service oriented virtual networks, and are not applicable to multicast service oriented VNs. Furthermore,...
The Binary Offset Carrier (BOC) modulation has been selected by the four most influential Global Navigation Satellite Systems (GNSS) and several other regional ranging systems. Although the Autocorrelation Function (ACF) of BOC has sharper main peak and better multipath mitigation performance than BPSK, its multiple side peaks cause ambiguity in signal acquisition and tracking. In this paper, we present...
To improve the localization accuracy in a small scale of indoor environment a passive target localization method is presented. The indoor target localization system is consisted of four wireless transmitters which could transmit known signals. The receiver meaning the target passively receives four signals from the four signal transmitters and then calculates the propagation time differences of arrival...
An repetitive learning control strategy is presented for a class of bilinear parametric systems with mixed unknown time-varying and time-invariant parameters and unknown time varying delay. By reconstructing the system equation, the time-varying delay is combined into an unknown periodic time-varying vector which is estimated by a periodic adaptive mechanism. The proposed control scheme includes a...
This paper presents a stability analysis of power system stabilizers (PSS) for synchronous generators with inclusion of time delays. The paper shows that a time delay in the PSS feedback loop can improve the small-signal stability of a power system if the regulator gain is properly tuned. The paper provides a proof-of-principle analysis based on the classical model of the synchronous machine as well...
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