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The performance of interconnection networks is heavily influenced by routing algorithms. The selection function, which decides the final output channel when a set of admissible output channels exist, is essential for an adaptive routing algorithm. Congestion is usually a major cause of performance degradation in interconnection networks. In this paper, we present a simple and efficient selection function...
Active queue management (AQM) plays a significant role in network congestion. A new adaptive PID controller for AQM is presented to overcome the shortcomings of PID AQM such as parameters cannot be adjusted with time, cannot be adapted to the dynamic and nonlinear network. The new algorithm integrates PID control law and neural network, which not only has the merits of both but also overcomes the...
Cooperative vehicle safety (CVS) systems rely on vehicular ad-hoc networks operating in broadcast mode to deliver vehicle tracking and safety information to neighboring cars. This information is used to enable collision avoidance and warning systems. One of the main challenges of the eventual large scale deployment of such systems is network congestion, which could critically degrade the quality of...
To address the problems of network congestion, Active queue management (AQM) is advocated to improve the quality of services (QoS) for Internet. Random early detective (RED) algorithm is one of notably AQM mechanism, because it could reduce the high drop rate of bursty flows, avoid global synchronization among flows and reduces network latency (“ping time”). However, RED requires careful tuning of...
In recent years the research on Vehicular Ad Hoc Network (VANET) has been paid much attention due to the development of wireless network becoming mature, people think highly of traffic safety issue, the popularity of Global Positioning System (GPS), promising applications of VANET being exploited. However, VANET has the essential property of rapid change of large scale network topology. Besides, the...
Introducing adaptive online data compression at network-internal nodes is considered to mitigate congestion on the network. In this paper, assuming that advanced relay nodes, which possess both a relay function (network resource) and a processing function (computational and storage resources), are placed inside the network, we propose an adaptive online lossless packet compression scheme performed...
The adaptive control speed algorithm, developed in this paper, adapts the control performance according to the communication quality of service in a networked control system. The adaptive control speed algorithm is distributed among several control loops, all sharing a bandwidth limited network. The target is to adjust the control speed and sampling interval of all the control loops, such that the...
Wireless cellular environments, such as UMTS, are often affected by congestion and errors, which are inherent to wireless transmission channels due to fading, interference, resource scarcity, mobility, etc. For a conversational video application to be successful i.e., to provide good viewing quality to the receiver at all times, the sender must be able to quickly adapt its sending/encoding rate (and...
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