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This paper demonstrates the usage of novel cognitive methods that improve the throughput of a WIMAX network by minimizing packet loss. The effects of the ant colony and fastest path routing algorithms on the throughput are investigated. a combination of Time Division Multiple Access (TDMA) and Orthogonal Frequency Division Multiple Access (OFDMA) spectrum sharing techniques is used. Data packet loss...
In the paper we investigate the methods of constructing the routing tree in WiMAX networks with mesh topology. The concept of network efficiency optimization by building the routing tree characterized by selected topological properties that are independent on network load is presented. As an important partial result, correlations between topological parameters of the tree and network efficiency have...
Remarkable wireless networks technology developments have made us to expect the realization of new applications like the advanced traffic system, the disaster prevention system, and the adhoc network system. However some of new wireless network services need the network which is never died. In this paper, Never Died Network with the Combination of Cognitive Wireless Network and Satellite System. The...
In this paper we propose a Packet-based measurement technique called Floating IP Active Measurement (FIPAM) that utilizes routing loop to measure Delay and Throughput in IP networks. Calculating these parameters in multi-provider and complex networks like Internet has became a challenge as most of current active measurement tools relying on ICMP and majority of today's networks block ICMP traffics...
In this paper, we introduce cognitive wireless network for a disaster information system based on dynamic network reconfiguration method to improve the connectivity. Our network system is consisted of multiple mobile routers based on currently available wireless LANs including IEEE802.11b,g,j,n, IEEE802.16 (WiMAX), cellular networks. Using those different standardized wireless networks, the disaster...
A new multi-paths routing algorithm has been proposed in this paper, which can solve the problem of congestion caused by overloads of links and provide a better environment compared with the traditional networking technologies. This methodology will call the routing mechanism when the links appear overloads, and it can adopt alternative path or multi-paths to complete data transmission to reduce congestion...
In order to become truly ubiquitous, the Internet of Things (IoT) has to evolve to provide connectivity anytime, any place, for any thing. IEEE 802.15.4-based wireless personal area networks (WPANs) is a preferable communication method for IoT. Wireless personal area networks (WPANs) are used to convey information over relatively short distances. Connections effected via WPANs involve little or no...
There are two causes of network congestion: one is the lack of network resources, and the other is the irrational allocation of network resources. While traditional congestion control methods such as rate control, window mechanism, queue control, etc. can be applied to solve the congestion problem, but for the later congestion case, the fundamental solution is to make more effectively use of the network...
Mesh is a network topology that achieves high throughput and stable intercommunication. With great potential, it's expected to be the key architecture of the future network. Wireless sensor networks are an active research area with numerous workshops and conferences arranged each year. This paper designs a new routing metric for wireless mesh sensor networks on the study of traditional metrics. Results...
This paper proposes a new ring structure of network coding (RSNC) based on existing network coding topology, enlarging the field of application and reducing the complexity of coding. On the basis of real-time monitoring and dynamic allocation for network bandwidth, RSNC is applied to the CERNET backbone network. The route of the packet is decided by the source node when it sends data packet and it...
In the paper the opportunistic scheduling approaches to further enhance the throughput of next generation wireless networks of multiple users. Our framework enables us to investigate various categories of scheduling problems, use optimal solutions for these scheduling problems. An attractive feature of these optimal solutions is that they are given in a simple parametric form. We provide algorithms...
LTE-Advanced is the next major evolution step for E-UTRAN LTE in 3rd Generation Partnership Project (3GPP). One of the key technology enhancements in LTE-Advanced to fulfill the performance requirement and to improve the user experience at cell edge is wireless self-backhauling relay, so called "Type-1 Relay". In the recent 3GPP RAN plenary, Type-1 relay was approved as a work item in release...
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 work interests in the one-way multiple-access relaying channel (MARC), in which analog network coding (ANC) is employed. The one-way MARC relaying channel consists of two source nodes, one relay node, and one destination node, all of which work in half-duplex state. The two source nodes want to transmit information to destination node with the help of relay. For the scheme, the outage probabilities...
We address the problem of routing for multi-radio multi-channel wireless mesh networks, and propose a novel routing metric, named DARM. Compared with the prior routing metrics focus on the network throughput, DARM aims to minimize the end-to-end delay, which is a significant requirement for multimedia applications. Our routing metric captures the effects of variation in link loss-ratio, the length...
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,...
Currently implemented Spanning Tree Protocol (STP) cannot meet the requirement of a data center due to its poor bandwidth utilization and lack of multipathing capability. In this paper, we propose a layer-2 multipathing solution, namely dynamic load balancing multipathing (DLBMP), for data center Ethernets. With DLBMP, traffic between two communication nodes can be spread among multiple paths. The...
In this paper, we address the problem of low-latency routing in a vehicular highway network. To cover long highways while minimizing the number of required roadside access points, we utilize vehicle-to-vehicle communication to propagate data in the network. Vehicular networks are highly dynamic, and hence routing algorithms that require global network state information or centralized coordination...
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...
We consider the problem of optimizing the performance of a network coding router with two stochastic flows. We develop a queueing model which accounts for the fact that coding is not performed when packets are transmitted, but is done by a separate program or hardware which operates independently of the hardware that sends packets out over links. We formulate and solve a constrained optimization problem...
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