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Spurred by the increasing demand for mobile broadband services and the growing number of devices supporting multiple radio access technologies (e.g., cellular, WiMAX, Wi-Fi, Bluetooth), much research is being done to improve the user experience while addressing issues related to network efficiency, congestion, interference, and cost to operators, service providers, manufacturers, and consumers alike...
A learning automata (LA) is an automaton that interacts with a random environment, having as its goal the task of learning the optimal action based on its acquired experience. here, we present a ERQD algorithm for congestion avoidance in wired networks. The main aim of this algorithm is to optimize the value of the average size of the queue used for congestion avoidance and to consequently reduce...
In mobile ad hoc networks (MANETs) where there exist multiple Internet gateways, performing load balancing among available gateways is vital in order to take full advantage of the network capacity and improve the performance. However, performing load balancing in a wireless environment is very challenging due to the inherently interfering and unreliable nature that characterize wireless communication...
This work presents a study of a SIP-based IP telephony system in terms of Quality of Service (QoS) and admission probability. The system is designed for an enterprise with offices in different countries. A software IP PBX maintains the dial plan, and SIP proxies are used in order to implement Call Admission Control (CAC) and to allow the sharing of the gateways' lines. The system is implemented in...
We present a lightweight algorithm for the estimation of the achievable throughput in IEEE 802.11 wireless networks. In particular, we consider a WLAN operating in infrastructure mode, where, through our algorithm, the access point (AP) can: (i) estimate the available bandwidth that a new station wishing to join the network can use, and (ii) evaluate the impact on the system performance of admitting...
The performance of TCP-based applications depends on the selection of queue management mechanism in network routers and how well its control decisions are made. Fast Congestion Notification (FN) mechanism enables the two control decisions, packet admissions and congestion control directing, to be made together. This permits sending congestion avoidance notification as early as required, even if the...
The enormous popularity of World Wide Web and its application of searching have caused a tremendous increase in network traffic and congestion in network. This project solves this problem by using the techniques of web caching and web prefetching implemented in our proxy system. Web caching has introduced as an effective solution to the problems of traffic congestion and effective bandwidth utilization...
Voice over IEEE 802.11 networks is a costeffective solution compared to cellular telephony in small areas and therefore considered among the killer applications of emergent Wireless Mesh Networks (WMNs). However, traditional random medium access control (MAC) protocols used in IEEE 802.11-based WMNs, which are suitable for throughput-sensitive data services, are far from guaranteeing the low delays...
In this paper, we propose new methods to reduce the handoff blocking probability in LTE wireless networks. This reduction is based on an adaptive call admission control scheme that provides quality of service (QoS) guarantees and gives the priority of handoff call (HC) over new call (NC) in admission. The performances of the proposed schemes are compared with other method by simulation. Our new method...
Random Early Detection (RED) algorithm, a framework of active queue management (AQM), has been proposed in order to improve the performance of congestion routers due to the increased use of Internet. But, the basic problem of a lag between congestion's occurrence and its remedy remained. To overcome this problem of RED, Explicit Congestion Notification (ECN) proposed by the IETF that allows end-to-end...
The main contribution of this work is to propose a distributed and collaborative cache solution in which the decisions to cache objects are performed in a collaborative way. In our solution, objects are classified in private and shared objects. Private objects are managed as in an individual cache system whereas the management of shared objects are performed collectively and are stored in a shared...
This work describes a distributed and flexible mechanism to perform network admission control and topology management for wireless mesh networks. The proposed method uses the concept of supply and demand to dynamically organize the wireless network. Mesh networks deployment and topology control is an interesting problem since the needs of two sites, even though using the same kind of equipment and...
Wireless Mesh Network (WMN) is a fast developing intelligent community network to provide multimedia services to the residents. With the latest development of technologies in broadcasting and smart mobile devices, to view videos on these handheld devices via WMN will become an essential lifestyle in the future. However, current WMN faces challenges to deliver videos to multiple users because of the...
Ad hoc mobile networks are composed of mobile nodes communicating through wireless medium, without any fixed backbone infrastructure. In these networks, Congestion occurs in any intermediate nodes when data packets travel from source to destination and they incur high packet loss and long delay, which cause the performance degradations of a network. This paper presents the early detection congestion...
The most common broadband access technology today is the (Asymmetric) Digital Subscriber Line (A)DSL. As the name implies, ADSL allocates the bandwidth of upstream and downstream asymmetrically, significantly favoring the downstream direction. Popular applications that serve content over these networks in the upstream direction, such as peer-to-peer (P2P) applications, efficiently utilize the comparably...
Internet “Congestion” occurs when the aggregate demand for a resource (e.g. link bandwidth) exceeds the available capacity of the resource. Resulting effects from such congestion include long delays in data delivery, wasted resources due to lost or dropped packets, and even possible congestion collapse, in which all communication ceases in the entire network. “Congestion control” mechanism, implemented...
Congestion control is an important research area in wireless mesh network(WMN). In order to solve congestion control in WMN, a random routing algorithm based on path weights (WA) is presented. The algorithm adopts multi-gateway wireless mesh network routing protocol to solve the congestion problem of single gateway. And anycast service was used to ensure the successful rate of service requests. Simulation...
Wireless communication technologies can bring great benefits to industrial automation systems. But because of the high data losses and transmission errors caused by channel fading and interference, the hard real-time and reliability requirements of industrial automatic control are more difficult to be guaranteed. WIA-PA is the new Chinese industrial wireless communication standard for process automation...
The standard transmission control protocol(TCP) can not distinguish between the random packet losses due to high bit error rate(BER) and the packet losses due to network congestion. TCP responds to all losses by invoking congestion control and avoidance algorithms, resulting in degraded end-to-end performance in wireless and lossy systems. Meanwhile, the performance of TCP would be deteriorated very...
Heterogeneous Wireless Networks are considered nowadays as one of the potential areas in research and development. The traffic management schemes that have been used at the fusion points between the different wireless networks are classical and conventional. This paper is focused on developing a novel scheme to overcome the problem of traffic congestion in the fusion point router interconnected the...
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