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With an increasing use of Long-Term Evolution (LTE) in mobile networks, it is necessary to evaluate its performance. In this paper, we evaluate the performance of Long Term Evolution (LTE) for mobile networks under Transmission Control Protocol (TCP) traffic. We evaluate the performance of LTE for TCP traffic for both the directions uplink as well as downlink. During the evaluations, we focus on the...
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...
Wireless Sensor Networks (WSNs) are used for monitoring and data collection purposes. A key challenge in effective data collection is to schedule and synchronize the activities of the nodes with global clock. This paper proposes the Synchronized Data Aggregation Algorithm (SDA) using spanning tree mechanism. It provides network-wide time synchronization for sensor network. In the initial stage algorithm...
Power conservation is a critical issue in wireless networks as the mobile devices are battery constrained and therefore researchers have been constantly working for saving power by following standard Type I, II and III sleep scheduling algorithms. In this paper we have proposed a new improved algorithm of Traffic Dependent Power Conservation, which proactively divides the MSSs(Mobile Subscriber Stations)...
In this paper, we study the formation and update process of agent's opinion of view in the social network. Based on the Non-Bayesian learning model, we develop three kinds of social learning models: Static social network model with fixed delay; Random evolution of dynamic social network model; Deterministic evolution of dynamic social network model with fixed delay. By applying the algebraic graph...
The consensus of double-integrator discrete-time multi-agent system is studied based on the second-order neighbors' information in this paper. The comparison between the convergence rate of second-order neighbor protocol and the one of general protocol is analyzed. Considering there exists delay in communication, the consensus condition of double-integrator discrete-time multi-agent system with delay...
A challenging issue in data collection in duty-cycled wireless sensor networks (DC-WSNs) is the trade-off between lifetime and latency. Indeed, duty-cycling has long been a critical mechanism for energy conservation in WSNs where the sensor nodes switch between active and dormant states. Moreover, this mechanism involves strong sleep latencies leading to severe end-to-end delay degradation. In this...
Service discovery is an integral part in establishing an independent and self-organizing mobile ad-hoc network(MANET). In this paper a new distributed semantic service discovery scheme is proposed for MANET consisting of various mobile terminals. The proposed scheme based on the proactive routing protocol, Destination-Sequenced Distance Vector (DSDV), maintains the information on the network in the...
The behavior of Networked Embedded Systems (NES) is not only driven by network components but also by the surrounding environment. To verify the correct behavior of such systems, different tests should be performed under different environmental conditions. The complexity and expense of testing such systems in real environments leads us to propose a simulation-based approach to tackle this problem...
Rapid technological advances and innovations in the area of autonomous systems push the researchers towards autonomous networked systems with emphasis on Wireless Sensor Networks (WSNs). In WSN event-driven applications, it is critical to report the detected events in the area, resulting in sudden bursts of traffic due to occurrence of spatially-correlated or multiple events, causing loss of data...
Passive Optical Networks (PONs) are attractive fiber-based access systems providing broadband access solutions at a low cost. A hybrid Wavelength Division Multiplexing (WDM) — Time Division Multiple Access (TDMA) PON is a favorite PON configuration, in which the researchers have drawn much attention. We have analysed and proposed several protocols for dynamic wavelength allocation in a WDM-TDMA PON,...
The paper describes a service model for cost-effective event reporting to clients over a wide-area network. The service provider (SP) maintains multiple protocol mechanisms to replicate the event pages at different proxy nodes of the distribution network. The mechanisms, which embody server-driven and client-driven replica update schemes to synchronize the page copies, reduce the access latency on...
The IP Multimedia Subsystem (IMS) seems to be the technology that will prevail in Next Generation Networks (NGN s), since the interworking environment and the service flexibility that this technology offers to the currently deployed wireless broadband technologies makes it appealing to users, service developers and network operators. In this paper a heterogeneous network model based on the IMS that...
This paper studies the stabilization of Networked Control Systems (NCS) with communication constraints, variable delays and variable sampling intervals. The system sensor nodes are supposed to be distributed over a network. The scheduling of sensor information towards the controller is ruled by a quadratic protocol. This protocol first compares the weighted errors of the signals in individual nodes,...
The focus of this paper is on the co-design of control and communication protocol for the control of multiple applications with unknown parameters using a distributed embedded system. The co-design consists of an adaptive switching controller and a hybrid communication architecture that switches between a time-triggered and event-triggered protocol. It is shown that the overall co-design leads to...
We propose a novel heuristic algorithm that performs geographical routing based on a greedy approach. Our proposed scheme first allocates the geographic locations of the source and the destination nodes influenced by their GPS information. A virtual Euclidean path is considered as a reference line to choose appropriate node for routing. Then, a multi-hop technique is adopted to establish routing path...
This paper presents a distributed event-based control approach to cope with communication delays and packet losses affecting a networked dynamical system consisting of N linear time-invariant coupled systems. Two communication protocols are proposed to deal with these communication effects. It is shown that both protocols preserve the system stability in the sense that the state of every subsystem...
Data aggregation from a set of sensors to a common sink over a tree-based routing topology is a fundamental traffic pattern in wireless sensor networks (WSNs). The time division multiple access (TDMA)-based scheduling protocols are suitable for such data aggregation applications. Most of the previously proposed TDMA schemes focus on a particular objective, such as minimizing schedule delay, latency,...
We consider how local and global decision policies interact in quickest time change detection in multi-agent models of the order book. A monopolist market maker sets two-sided prices for an asset. The market evolves through the orders of trading agents. Agents observe local individual decisions of previous agents via an order book, combine these observed decisions with their noisy private signals...
Characterizing the network delay distribution is a fundamental step to properly compensate the delay of Networked Control Systems (NCSs). Due to the random backoff mechanism employed by Wireless Personal Area Network (WPAN) protocols, it is difficult to derive such a distribution. In this paper, the probability distribution of the delay for successfully received packets in WPANs is characterized....
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