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In this paper, fault tolerance in a multi-radio network is discussed. Fault tolerance is achieved using the BeeHive routing algorithm. The paper discusses faults added to the system as random fluctuations in hardware radio operation. The multi-radio nodes are designed using WiMAX and WiFi Radios that work in conjunction using traffic splitting to transfer data across a multi-hop network. During the...
Maritime wireless ad-hoc network is the future of maritime communication. When navigators sail to the sea, they usually go together as a convoy to avoid the problem of natural causes and human factors such as occasionally severe weather conditions and piracy. In essence, the navigators need to communicate with each other in their convoy. To evaluate the system functionality, network simulators are...
This paper deals with the design of a Multi-radio Hybrid node that performs traffic splitting over a Multi-Hop Ad-hoc wireless network. The multiradio nodes have a WiMAX and a WiFi Radio that are used in transmitting data traffic over two different radio channels. Data traffic is split statically over a node and transmitted over the two radio channels. In the present work we consider the mobility...
WiMAX (Worldwide Interoperability for Microwave Access) is a wireless communication standard. Today largely used as a mode of transmission and access to broadband Internet. WiMAX is based upon IEEE Standard 802.16, it supports Point-to-MultiPoint (PMP) as well as Mesh mode. In this work, our main objective is to compare through simulations, the QoS performance parameters (Average throughput, average...
In this article we propose a new simulation module for NS-2 able to reproduce the performance of fixed terminals operating in a wireless network with one or more antennas at the receive end, based on empirical models validated on the literature. This is relevant to perform accurate cross layer analyses of fixed wireless systems as Wireless Local Loop, relay networks, WiMax for fixed or repositionable...
This paper studies the joint OFDMA resource allocation and QoS routing problem in a hybrid wireless network, which includes an OFDMA based cellular network and an ad-hoc network with many sensor nodes. In such application, each sensor node generates certain amount of data that need to be sent to cellular base station (BS). The cellular nodes act as gateway to forward all the uplink traffic. We formulate...
Multicast is a bandwidth-efficient mechanism to provide wireless services for a group of terminals. Providing reliable wireless multicast is challenging due to packet loss and channel fading. In this research, we investigate the medium-access-control (MAC) layer cooperation to enhance the reliability of wireless multicast. We show that the optimal relaying strategy is a pure threshold policy, i.e...
This paper studies OFDMA resource allocation for QoS provision in hybrid wireless network, which includes an infrastructure based cellular network and many ad-hoc nodes. The base station has to consider not only those cellular nodes with direct links but also ad-hoc nodes with multihop connectivity. We formulate the optimization problem to maximize the overall throughput, while satisfying the individual...
This work centers on the downlink scheduling algorithm for such cellular wireless networks with relays as IEEE802.16j. We propose an efficient algorithm to discover concurrent transmission scenarios under a multihop relay environment, while applying the back-pressure flow control mechanism to reflect the dynamic queue status of each relay station. Then, we develop a linear programming algorithm for...
Wireless mesh networks (WMN) are considered an attractive alternative to the traditional wired backbone networks for broadband Internet access. However, their capacity is limited due to the nature of the radio channel, which must be shared by the nodes forwarding the traffic from and to the gateway. Therefore, estimating the capacity of WMNs is an important question. The capacity analysis proposed...
With the increase of network service types and userspsila broadband demand, broadband wireless access (BWA) has become the focus of peoplepsilas attention. The workgroup of IEEE 802 proposes the IEEE 802.16 standard to provide BWA. In IEEE802.16 mesh mode, all nodes are organized in an ad hoc fashion. Nodes use a pseudo-random function to compete for their transmission opportunities based on the scheduling...
The diversification of wireless communication usage has been proceeding rapidly with the diffusion of cellular phones, WiFi and WiMAX. In the emerging wireless communication environments, diverse wireless systems coexist. On the other hand, there is increasing concern that the growing use of wireless systems will exhaust the finite wireless resources. To solve this problem, we aim to optimize the...
The wireless multihop to an access point model appears to be a promising component of future network architectures, including multihop cellular networks and wireless access networks at the edges of mesh networks. Sophisticated software radios and core network protocols are being developed to support the integration of heterogeneous air interfaces within these access networks. A key challenge is managing...
Wireless self-organizing network including WiMAX (worldwide interoperability for microwave access) mesh networks can provide effective communication in pervasive computing environment. To resolve the problem that WiMAX Mesh network lacks QoS (Quality of Service) guarantee mechanism, a novel resource reservation mechanism used in WiMAX mesh network is proposed. This mechanism uses existing service...
Energy consumption is of utmost importance in ad hoc wireless networks where battery-operated nodes have limited power resources. Energy consumption is also important in meshed WLAN networks such as emerging home entertainment networks and meshed WiMax metropolitan area networks. So far, it has been advocated that nodes have to operate at the lowest possible power level that keeps the network connected...
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