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Quality of Service (QoS) of video streaming service over wireless and mobile network is determined by many intermingled factors. Some of the factors can be adjusted. Video resolution, audio rate, and bandwidth are among of them. Other factors are not fully controllable such as network throughput, delay, and packet lost probability. In order to increase user satisfaction, efforts to make better quality...
In a Mobile Ad-Hoc Network environment, wireless devices have finite resources such as memory, energy and they work within the wireless constraints such as limited bandwidth and unreliable communication. Therefore, storage space, bandwidth, and battery life must be managed effectively in order to extend the usefulness and lifespan of wireless devices and the network. Caching is one of those techniques...
In the regular of wireless network, conserving energy is important to extending the lifetime of mobile nodes and network. The goal of this paper is investigated the comparison of energy conservation between idle mode and power down mode based on the microcontroller. The LWM-433H wireless module is applied with the microcontroller. The operation of idle mode and power down mode are controlling the...
A mobile ad hoc network is a wireless network without any fixed infrastructure or centralized control. Due to the infrastructure-less mode of operation, mobile ad-hoc networks are gaining popularity. In order to cover a wider area with less fixed infrastructure, sometimes the ad hoc network may be combined with a wired one to form a hybrid network. In such a combined network, in order to transfer...
Software tool of NS-2 is used to modern network simulation. It introduced in software's Mobile IP, it has carried on the analog simulation using the NS simulation software to the wireless network's course of communications. And it calling NS's Nam animation window to carry on the simulation demonstration, and carrying on analysis of related data record documents.
Energy saving is one of the important tasks in wireless communication due to the limited battery attached to the mobile devices. This paper has two parts. In the first part, we give a localized algorithm for constructing the Voronoi diagram with the given set of nodes in wireless networks. In the later part, an energy efficient network architecture for wireless networks using Voronoi diagram is described...
Opportunistic networking is one of the most interesting evolutions of mobile ad hoc networks. In this kind of wireless network, mobile nodes such as mobile phones and PDAs, use the mobility of devices as well as wireless forwarding between intermediate nodes to communicate with each other, hence a complete route between source and destination is not required at any point in time. The design of efficient...
This paper introduces a generalized framework for positioning mobile nodes in a wireless network. The transformation of the range data measured between pairs of network nodes into a spatial position is a very challenging task if the range measurements are distorted. Typical distortions in wireless ranging systems are caused by an imperfect clock synchronization or by multipath reflection. The positioning...
The increasing number of wireless communications applications in mission critical tasks and lifeline areas demand increased wireless communications reliability. Radio quality prediction for mobile terminals will play a key role in enhancing this reliability. Time-series radio quality prediction (TSRP) methods, which predict future radio quality based on past radio quality measurements, have been proposed...
Microsoft Researchpsilas Conference Experience Project (ConferenceXP) is an initiative of Microsoft Research exploring how to make wireless classrooms, advanced real-time collaboration, and distance learning a compelling experience by assuming the availability of emerging technologies, such as high-bandwidth networks, multicast, wireless devices and Tablet PCs. In this short paper, authors describe...
The transmission control protocol (TCP) provides reliable transport services between end-points and enjoys predominant share as carrier of data traffic over Internet. Last mile wireless links have challenged TCP effectiveness because of fluctuations in link quality and relatively low data rates. These fluctuations cause major performance degradation in terms of reduced throughput, increased retransmission...
Due to the introduction of telecommunication technologies in telemedicine services, the expeditious development of wireless and mobile networks has stimulated wide applications of mobile electronic healthcare systems. However, security is an essential system requirement since many patients have privacy concerns when it comes to releasing their personal information over the open wireless channels....
The following article is about the network quality of service issues, which is a set of technologies that enable to users obtain from the network predicted level of services basing on particular rules e.g. throughput, delay and jitter. An investigation and comparison of QoS mechanisms, focusing on the Internet protocols has been done here, to analyze and compare existing solutions. Beginning from...
The usage of multimedia applications such as IP-TV and Video On Demand over wireless networks becomes more and more popular. In many cases the bandwidth of the wireless channel is the system bottleneck and thus it is important to increase the ability of wireless networks to provide a scalable service for multiple users simultaneously. The main idea proposed in this paper is based on a dynamic bandwidth...
Mobile IP allows a mobile node to maintain a continuous connectivity to the Internet when moving from one access point to another. However, due to the link switching delay and to the Mobile IP handover operations, packets designated to mobile nodes can be delayed or lost during the handover period. This paper presents a new control function called Extended Handover Control Function (E-HCF) in order...
Among different techniques that provide mobile positioning, using the Received Signal Strength (RSS) is regarded as a low-cost solution which is applicable in a wide range of wireless networks. In this paper, we propose a cooperative RSS-based positioning algorithm that utilizes the additional RSS data of the short range communications between mobile stations (MSpsilas). We use a nonlinear least square...
Comparing to wire networks, there are many different characteristics in wireless environments, which make TCP congestion control mechanism is not directly suitable for wireless networks and many improved TCP congestion control mechanisms have been presented. But these improved schemes are not considered the influences to TCP senderpsilas packet sending rate by the wireless link corruption. However,...
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