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This paper investigates the problem of mean square finite-time passivity for discrete-time Markov jump neural networks with time delays and stochastic perturbations. In the measurement equation, a class of sensor nonlinearities are considered, which cover the standard Lipschitz condition as a special one. A sufficient mean square finite-time boundedness condition is established based on Lyapunov-like...
Management of overflows caused by stochastic traffic arrivals is one of most important consideration for traffic signal control of isolated intersection because overflows of one cycle can results in not only extra delay in following cycles but also blocking of upstream intersections. Although the stochastic arrivals problem has been studied either by simulation based methods or analytical models,...
It is a paradigm shift in internet architecture from receiver centric model to the information centric networking (ICN) model to improve the end-users' latency experience. With exponential increment in number of users and data volume, efficient usage of the nodes (caches) and content forwarding methodology are key issues in an ICN architecture. In ICN intra-domain routers have storage capacity and...
The IEEE 802.11p is an emerging wireless protocol dedicated for Wireless Access in the Vehicular Environment (WAVE). It employs the Enhanced Distributed Channel Access (EDCA) mechanism to access the channel. Its objective is to provide differentiated services to vehicular networks which are delay-sensitive and requires high communication throughput. In this paper, we carry out comprehensive performance...
Analytical models of the Distributed Coordination Function (DCF) have numerous applications in the performance analysis of IEEE 802.11 networks. The model proposed in this paper distinguishes itself from existing approaches in that it allows throughput, delay, and frame loss ratio analysis under both saturation and non-saturation network conditions. It combines the Markov chain and the queuing theory...
We propose a decode-forward protocol for streaming over a relay network using sequential random tree codes. An achievable bound on the end-to-end error performance is derived. The bound is parameterised by the number of errors occuring at the relay, which is the sum of correlated Bernoulli processes. The bound is useful for determining the achievable delay-exponent as well as for designing finite-delay...
Designing a robust, queue model for networking architectures is both complex and challenging. Validity, fairness and generality are key success elements in each examined modeling scheme. In this paper, we present a working scheme refered to as Network Queue Set Theory (NQST), based on Continuous Time Markov Decision Process (CTMDP) and Set Theory. From this original work, we delineate the referenced...
In this paper, we identify sufficient conditions for Lyapunov Mean Square Stability (LMSS) of a contention-based network of first-order systems, with state-based schedulers. The stability analysis helps us to choose policies for adapting the scheduler threshold to the delay from the network and scheduler. We show that three scheduling laws can result in LMSS: constant-probability laws and additively...
In this paper, the statistical properties of a change detection algorithm are considered. More specifically, we considered the exponentially weighted moving average (EWMA) algorithm. Analytical expressions for the probability distribution of detection delay and the time between false alarms are proposed, and the results are validated by simulations. The results can be used in examining the abrupt...
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....
This study analyzes the transportation network of a major rail freight operator in order to obtain a model of delay propagation of trains connecting intermodal terminals. Operational management of a rail freight operator needs to take into account deviations due to unexpected events such as unplanned maintenance, strikes, railroad works, traffic congestion. The dispatcher makes train assignment decisions...
Carrier Sense Multiple Access (CSMA) has been widely used as a medium access control (MAC) scheme in wireless networks mainly due to its simple and totally distributed operations. Recently, it has been reported in the community that even such simple CSMA-type algorithms can achieve optimality in terms of throughput and utility, by smartly controlling its operational parameters such as backoff and...
In the Medium Access Control (MAC) layer of a wireless network that uses Carrier Sense Multiple Access (CSMA), the performance is limited by collisions that occur because of carrier sensing delays associated with propagation and the sensing electronics. In this paper, we use a continuous-time Markov model to analyze and optimize the performance of a system using CSMA with collisions caused by sensing...
Packet loss is a major problem for real-time Internet applications. Markov models of packet loss are often used to develop and evaluate the performance of these applications. Despite their wide use, these models have not been validated in terms of how well they capture the loss conditions experienced by residential Internet users. We evaluate the accuracy of common packet loss models using traces...
The problem of quickly detecting a statistical change and identifying the change source is considered. In the problem studied, there are multiple sensors. A change can first occur at any one of these sensors and propagate to other sensors. One is required to detect the presence of such change with a minimal delay and furthermore identify the sensor that first observes the change. Three performance...
In-band spectrum sensing protocols require that the secondary users (SU's) periodically suspend their transmission periods and sense the channel in order to determine whether the primary user (PU) has emerged or not. There is a tradeoff between the spectrum sensing period and the throughput of the SU, often referred to as sensing-throughput tradeoff. In this paper, using the receiver error count,...
In this paper, an innovative TCP flow control method is presented. An algorithm is proposed that combines RED (Random Early Detection) with TCP window adjustment to improve the network performance. Leveraging the advantages of RED and window adjustment, the algorithm demonstrates fast response and superior stability with controlled packet dropping rate, while still fully utilizing the network resource...
In this paper, we conceive an energy-efficient power and subcarrier allocation scheme for downlink OFDMA systems under average delay constraints. The services associated with multi-users have different packet arrivals and delay requirements. The problem of dynamic power and subcarrier allocation is formulated as a constrained Markov decision process (CMDP) with control actions based on the joint states...
Sustainable computer networking approaches adapt network node power states dynamically in response to traffic demand. This scenario imposes new challenges to the way the network resilience is evaluated based on reliability and availability metrics. The traditional assessments of reliability and availability based on Markov models or the Cut-Set and Tie-Set techniques are based on static values and...
This paper deals with the problem of delay-dependent robust stochastic stabilization and robust Η∞ control for uncertain markovian jump systems with multiple delays in both state and input. Based on the conditional expectation of the Markov chain's mode-set, an improved method of the delay-dependent robust stochastic stabilization for this markovian jump systems is obtained by introducing a mode-independent...
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