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Currently, more and more research work has been done for the optimization of TCP performance in wireless networks. The majority of these schemes proposed are trying to optimize the system within the single layer. Obviously, jointly considering the interaction between transport layer and other layers, it may bring the improvement for TCP performance. In this paper, we propose a novel approach using...
Based on the analysis of TCP performance of over the two ways of IEEE 802.11 DCF (RTS/CTS and CSMA/CA), TCP flows becomes unstable when WLAN is in high load. In this paper, we propose a novel backoff algorithm for IEEE 802.11 DCF named as ACWB (adaptive contention window backoff) with cross-layer optimization. Its basic idea is to dynamically adjust the size of the contention window by the estimation...
In this paper, the global exponential stability is studied for a class of cellular neural networks with distributed delays. With assuming global Lipschitz conditions on the activation functions, based on the vector Lyapunov function, using the technique by virtue of Young inequality and Halanay differential inequality with delay, some sufficient conditions are obtained to ensure the uniqueness equilibrium...
A class of impulsive neural networks with distributed delays is studied in this paper. With assuming global Lipschitz conditions on the activation functions, applying idea of vector Lyapunov function, combining Young inequality and Halanay differential inequality with delay, sufficient conditions are obtained for the existence of unique and global exponential stable equilibrium of the distributed...
A Real-time and reliable detection of anomalies is an important and challenging task. Unlike most detection methods based on the statistical analysis of the packet headers (Such as IP addresses and ports), we propose a new nonlinear approach only using network traffic volumes to detect anomalies reliably. Our method is based on the largest Lyapunov exponent and the change-point detection theory to...
In W-CDMA (Wideband Code Division Multiple Access)/UMTS (Universal Mobile Telecommunications System), multiuser contention brought by packet scheduling in MAC-layer causes the issue that effectiveness requirements and fairness requirements for TCP in transport-layer are difficult to be guaranteed simultaneously. In order to solve this problem, we propose a novel scheme CL-AACS (active ACK control...
This paper studies the linear quadratic regulation problem for linear discrete time-varying systems with one or multiple delays in control input. This type of input-delay system can be used to model delayed actuation, where the system depends on the input after various (could be more than one) time delays. We provide explicit forms of the finite horizon closed-loop optimal control laws. Numerical...
This paper investigates a class of finite-horizon linear quadratic regular control problem for the continuous networked control systems with both packet delay and packet dropping. Based on estimation approach, a complete and explicit solution to the LQ problem is given in terms of a backward Riccati equation. The control input can be determined without knowing whether the previous control signal is...
Botnets have become one of top threats to the Internet. Many detection methods have been developed to distinguish botnet behaviors from normal human behaviors. Future botnets, however, may incorporate the characteristics of human beings and weaken the existing detection techniques. In this work, we study an intelligent botnet, called the delay-tolerant botnet, that intentionally adds random delays...
Comparing to wired network, there are many different characteristics in wireless environments such as higher error rate, lower bandwidth, frequent mobility and so on, which result in difficulty to guarantee qualities of service (QoS). To improve TCP performances in wireless networks, we propose a novel TCP congestion control mechanism with QoS-guaranteed cross-layer optimization that can be easily...
The typical signal characteristic capture method in multi-domain is discussed in a tutorial view. Since the typical signal characteristic capture method can't capture the whole signal which characteristics vary with time, a novel high efficiency architecture for signal characteristic capture based on real-time multi-domain trigger is proposed. Combined with the flexible cyclic trigger delay data storage...
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