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This paper considers optimizing the utilization of radio resources in a heterogeneous networks consisting of a WLAN and a CDMA network. We propose a joint admission control scheme for multimedia traffic that exploits vertical handoffs as an effective tool to enhance radio resource management while guaranteeing handoff users' QoS requirements. The network resources utilized by the vertical handoff...
Network congestion is an important factor affecting the performance of large scale jobs in supercomputing clusters, especially with the wide deployment of multi-core processors. The blocking nature of current day collectives makes such congestion a critical factor in their performance. On the other hand, modern interconnects like InfiniBand provide us with many novel features such as Virtual Lanes...
Recent developments in the field of transmission line monitoring system have led to a renewed interest in wireless sensor networks, which is characterized by the strong real time, high reliability, adaptability, load balancing and so on. However, the bottleneck problem of network transmission which is likely to occur around the sink node must be taken into account. This paper proposes a new cross-layer...
The packet collision is one of the causes of wasted energy consumption in wireless sensor networks. This paper describes and analyzes the behavior of packet collisions in wireless sensor networks by simulations. The problems of packet collision include both direct and hidden collisions, and are classified by layers architecture: application, routing, and MAC. Moreover, we review and analyze the existing...
The range of parameter γ in FAST TCP are studied in this paper. A continuous time fluid flow model of the link buffer is considered to create a linear control system related to FAST TCP. Linearing the fluid flow model and window control model, the Laplace transform version of congestion control system are presented. It results in a negative feedback system with open loop transfer function. With the...
This paper analyzes the deficiency of the average queue calculation in tradition RED queue, and presents a calculation algorithm for the calculation of RED's average queue based on the current network conditions in order to enhance the self-adaptation of RED and we use NS2 for the simulation. Experimental results show that the improved RED performances better than tradition RED in the middle congestion...
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...
This paper represents QoS models of an IP Network with requirements to implement which monitors the state of resource usage and adaptively adjusts parameters of traffic admission control to overcome prediction or estimation inaccuracy and achieve a balance between QoS and resource utilization. This study also shows the traffic policy, shaping algorithm along with congestion avoidance mechanism. This...
Cognition concept and dynamic spectrum allocation (DSA) technique are applied in cognitive wireless network to increase spectrum utilization efficiency and alleviate network congestion. Due to the dynamic and random characteristic of radio environment in cognitive wireless network, this paper brings forward a dynamic channel allocation mechanism to minimize the probability of collision with the licensed...
This paper presents a Model of Quality of Service (QoS) for Next Generation Networks (NGN), that consist of a tower of five defined layers such as the Model Layer of QoS, Control of Admission, QoS in the Routing, QoS in the Signaling, and MAC QoS. In addition, the model raises a method based on the concept of segregation of functions defining two functional networks along with the tasks of QoS. Then,...
In this paper the Policing Traffic Management (PTM) is applied to improve the Quality of Service (QoS) over Inter-Vehicular Communications (IVCS). Bangkok is the capital city, and it is crowned of Ad Hoc nodes such as Mobile Ad Hoc Networks (MANET), FleetNET, CARNET, BTSNET and electronic devices. Each network has unique data traffic characteristics. For MANNET, most traffic is video and voice traffic;...
The Transmission Control Protocol (TCP) is a transport protocol which delivers packets strictly in order. For signaling protocols which send multiple independent requests within one single TCP session, the loss of a TCP packet may therefore lead to increased delay for later signaling requests. This phenomenon is known as Head-of-Line Blocking (HoLB) and for instance has led to the standardization...
Data center networks (DCNs) usually have a regular topology providing high bandwidth and low latency with multi-paths. In a data-intensive application on DCNs, it is important to be able to use all the available bandwidth. However, this is not easy to achieve because of the locality of congestion information. In this paper, we propose a reactive reroute strategy to incorporate with IEEE 802.1Qau standards...
The growing popularity of the World Wide Web is placing tremendous demands on the Internet. The world wide can be considered as a large distributed information system that provides access to shared data objects. As one of the most popular applications currently running on the Internet, the World Wide Web is of an exponential growth in size, which results in network congestion and server overloading...
Active queue management (AQM) is an effective method acting on routers to improve the performance of end-to-end congestion control. However, most of the current AQM schemes are sensitive to network configurations as well as parameterization problems. In this paper, we propose a self-tuning congestion control scheme, named SPC. An enhanced price with proportional-integral-derivative control property...
A few months ago, BitTorrent developers announced that the transfer of torrent data in the official client was about to switch to a new application-layer congestion-control protocol using UDP at the transport-layer. This announcement immediately raised an unmotivated buzz about a new, imminent congestion collapse of the whole Internet. As the new congestion control aims at offering a lower than best...
Lost packets, either due to errors or collisions, are usually discarded and need to be retransmitted, leading to performance losses. In this paper we compare the performance of two different approaches to cope with lost packets. One alternative is a multi-packet detection approach able to separate up to Qmax mobile terminals transmitting in one slot. The other alternative is a low-complexity soft...
We propose an algorithm to choose a reasonable backoff window based on prediction of the congestion of downstream and upstream nodes. The algorithm listens to the number of consecutive idle slots of the wireless network, then calculates the congestion and feeds it back to the downstream node and upstream node. When sending packets, a reasonable backoff window is chosen, depending on downstream and...
Network emulation plays an important role in conducting performance analysis of network protocols and studying various network-related issues, such as Quality of Service of multimedia applications and traffic control algorithms. In this paper, we design and implement a Windows-based network emulator, WINPLEM, using the Network Driver Interface Specification technology. The emulator is capable of emulating...
This work aims at building iPath - a path-selection system for multi-homed mobile hosts that assists vertical handoff. Unlike existing systems, iPath selects the access network interface for communications based on end-to-end path properties (e.g., available bandwidth, delay, packet loss rate, and jitter). iPath also adopts a new metric for handoff - “switching cost”, which is caused by the congestion...
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