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Visible Light Communication (VLC) is a new emerging technology, where delay is a Quality of Service (QoS) criterion for communication. This paper presents an analysis of the theoretically possible end-to-end delay and hop number for Light on Demand (LoD) and VLC-based multihop networks. Taking the human eye perception as a relevant parameter, total delay is analyzed at the Open Systems Interconnection...
Fiber Wireless (FiWi) provides a solution that combines gigabit passive optical network and Wi-Fi to provide huge capacity as well as mobility support. To manage the bandwidth in FiWi, a dynamic bandwidth allocation is proposed in this paper where it uses time division multiple access at the optical part and Carrier Sense Multiple Access with Collision Avoidance at the wireless part. Two methods are...
The design of wireless embedded systems needs their efficient and realistic simulation to verify that requirements are met. The reproduction of communication behavior is crucial to assess the performance of hardware and software components, e.g., dependability and energy consumption. This work presents and discusses different levels of abstraction for the simulation of the communication behavior....
With the development of wireless communication technologies, future networks will most likely be heterogeneous, consist of both wired and wireless links. However, current active queue management (AQM) schemes, which are originally designed for wired networks, could cause performance degradation of Transmission Control Protocol (TCP) flows over wired-cum-wireless networks. Thus, to deal with these...
Several reliable packet routing approaches have been studied to achieve a high reliable VANET by using the Car-to-car communications and Inter-Vehicle Communications. VANET suffers from high mobility, diverse road topologies, and wireless interference, and thus significantly degrades the connectivity of packet transmissions and network performance. The mathematical analysis can help the approach efficiency,...
In networked control systems, the network uncertainties can degrade the control performance and even result in instability, especially for the Internet-based control system with wireless communication in which the transmission delay could be many times of the sampling period of control systems. NPC (Networked Predictive Control) is an active method to compensate for the effects of network uncertainty...
A number of routing schemes have been proposed for intermittently connected mobile networks. In these schemes, a node carries a message and forwards the message to another node that it meets. To increase the delivery success rate, typically, multiple copies of the message are created and forwarded to multiple neighbor nodes. The neighbor nodes are selected based on such criteria as the probability...
In order to access to the time-Delay Performance of the Wireless Sensor Network, respectively preformed the time-delay experiment, simulation and theoretical analysis from the following aspects: the hops and hop spacing, MAC dormancy mechanism, back-off time and transmitted power, etc. Obtained the relations between the time-delay and the above factors. Systematically summed up the time-delay rules...
Conventional congestion control mechanisms like TCP New Reno fail to react appropriately to packet losses caused by error over the wireless link. Various modifications to loss based congestion control schemes have so far been proposed to overcome the corresponding performance degradation. In addition, the comparatively newer family of delay based congestion control mechanisms like Caia-Hamilton Delay...
This paper presents the adaptive logarithmic increase and adaptive decrease algorithm, called A-LIAD, as an alternative for the current TCP congestion control algorithm. We defined new increasing function in the fashion of logarithm depending on the increasing factor α which is different from the other logarithmic increase algorithm adopting the fixed vale of α = 2 leading to binary increase. The...
In this paper performance modeling for a mobile stations operating according to CSMA/CA with binary exponential back-off (BEB) is discussed. Unlike the previous studies we concentrate on delay and loss performance metrics experienced by individual stations. To obtain delay distribution of an arbitrary packet we use Geo(i)/G(i)/1/K queuing system representing the number of stations having a frame for...
Providing a service with good quality for transmission and playing real-time voice conversations (voice streaming) over wireless ad-hoc networks is always a big challenge. Buffering and adjusting the playout time of packets is one of the methods used to overcome this challenge which can be deployed in receiver side. In this paper, a new adaptive playout adjustment algorithm to stream the voice conversations...
Wireless multi-hop architectures are increasingly used in many wireless networks. However, it is very difficult to analyse and guarantee end-to-end delay performance over multi-hop wireless paths. In this paper, we develop a cross-layer analytical model to characterise the multi-hop delay performance and derive new mathematical formulae of (DBVP), delay mean and jitter of end-to-end communications...
Client relay is a promising technology to improve the performance of the cell-edge clients in a wireless cellular network. Unfortunately, there is a lack of performance analysis results for client relay networks in the research literature. This is mainly due to extremely complex interactions between network, data link and physical layers. In this paper we fill in this gap by proposing several techniques...
The problem of H∞ control design for vibration reduction of a base isolated structure with limited wireless communication capacity is studied in this paper. The network under consideration is subjected to measurement quantization, signal transmission delay, and data packet dropout, which appear typically in a network environment. Based on Lyapunov-Krasovskii functional (LKF) theory, some delay-range-dependent...
Performance evaluation of systems including, among others, components based on wireless links plays an important role both in the software and hardware engineering. In both cases the earlier evaluation of performance characteristics has been proved to be a key-factor for a successful design of new systems. However, most of the quantitative analysis methods suffers the problem of not being scalable...
Many schemes have been studied in the recent past facing the trade-offs between wireless mobility, the capacity impact and the Energy Conservation (EC) onto overall performance. Available resources should be supported by the effectiveness of the storing on-demand scheme along considering the EC of the wireless device. In this work there is a consideration of the diversity properties of the wireless...
A wide range of emerging real-time services require different levels of Quality of Services (QoS) guarantees over wireless networks. Scheduling algorithms play a key role in meeting these QoS requirements. Most of research in this area have been focused on deterministic delay bounds and the statistical bounds of differentiated real-time services are not well known. This paper provides the mathematical...
In the cellular wireless location, the presence of Non Light of Sight (NLOS) declined the location performance dramatically. To overcome the impact of NLOS on mobile positioning, a mobile positioning method based on biased Kalman filter and TDOA data reconstruction is presented in this paper. According to NLOS error distribution feature, NLOS smoothing of measurements and data reconstruction are accomplished...
One of the big fundamental issues in Bluetooth ad hoc network is its device discovery in network initialization which would effect the whole performance. The performance of short range wireless Bluetooth ad hoc network technologies depends on the promptness of its self-configuring procedures. Due to continuous inquiry and paging process, battery in Bluetooth-enabled devices is easily drained. This...
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