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Cognitive radio networks (CRNs) have become a popular research topic in recent years. Most existing CRN routing schemes focus on building a route that optimizes a single aspect of a network's performance, such as minimizing interference for primary users, or reducing the propagation delay or hop count. They do not consider the overall transmission performance for secondary users. In this work, our...
To resolve channel interference problem in cognitive wireless mesh network, a distributed both capacity and interference based channel assignment and routing algorithm is proposed. First, selecting the lowest cumulative cost route effectively according to the new routing metric, and then, selecting the channel with the minimum interference-capacity ratio. Simulation results show that compared to the...
End-to-end delay is an important QoS parameter in wireless sensor networks. The term end-to-end delay is the total amount of time taken for transmission of data to reach the destination. The parameter which causes end-to-end time delay in the wireless sensor network includes length of the path i.e. the number of repeaters and the congestion along the route. In this paper, main focus is end-to-end...
Cognitive radio network (CRN) has emerged as a promising solution to solve the problem of underutilization of licensed spectrum. It allows opportunistic access of unutilized spectrum (or white spaces) by unlicensed users (or secondary users, SUs) whilst minimizing interference to licensed users (or primary users, PUs). The dynamicity of channel availability has imposed additional challenges for routing...
In this paper, we propose algorithms for finding the optimum multi-hop routes and corresponding transmit powers that maximize the throughput between a pair of device-to-device (D2D) nodes, under a constraint on the maximum interference caused to the cellular network. Our solution involves two steps. In the first step, we determine the set of feasible D2D links, based on the interference constraint...
Routing is an essential part of data exchange in Mobile Ad-hoc Networks (MANETs). A protocol that can discover multiple routes from source to destination can support reliable routing of information in MANETs. However, a reliable routing protocol alone cannot enhance performance of MANETs. Nodes in MANETs also experience the problems of interference, exposed nodes and deafness. Hence a solution that...
This work aims to improve the performance of cooperative relaying in interference-limited multihop networks. The multihop network nodes are equipped with multi-rate and continuous power control capabilities. The existing technique does not yield significant performance gains with multi-rate and power control capabilities. To obtain the achievable throughput rates, a cross-layer flow-based framework...
We consider the channel allocation and routing problem for data transfer in wireless mesh networks with half duplex communication links. The interference constraints associated with channel allocation and the corresponding routing constraints are identified as a set of linear constraints. A mixed integer linear programming (MILP) formulation of the problem is then proposed to maximize the minimum...
With the wide application of these technologies in wireless networks such as Multipath transmission, opportunistic routing, Cooperative communication and so on, channel interference and resource contention become more intense, which greatly decrease the network throughput, seriously affect network efficiency[1]. Further, the ripple effect which caused by inappropriate channel switching will result...
This paper proposes an improved mesh path selection protocol for QoS support in wireless mesh network, while avoiding the inherent problems of proactive and reactive path selection elements. The proposed ‘Advanced Selective Greedy’ (SelG+) path selection protocol operates in two phases. In the first phase it constructs a set of potential forwarders for every mesh stations. In the second phase during...
Distance health monitoring is becoming an attractive option for both the patients and the medical sector staff. However, these systems face many design challenges including the large amount of processed data, users' mobility, and network coverage area. Accordingly, integrating cloud computing with Wireless Body Area Networks (WBANs) is amongst the best solutions to promote health monitoring systems...
As wireless sensor networks (WSNs) become denser, simultaneous transmissions (on the same time slot and frequency channel of two or more terminals) may cause severe interference. Appropriate interference-aware allocation is a complex problem and distributed frequency allocation is even harder. This work studies the problem of assigning frequency channels for a given WSN routing tree, such that: a)...
A novel clustering approach for cognitive nodes in CRN based Ad Hoc Networks (CRAHNs) is proposed in this paper. The Signal to Interference plus Noise Ratio (SINR) produced by Primary Users (PUs) on collocated Cognitive Users (CUs) along with Expected Transmission Time (ETT) among CUs is taken into account in order to form the clusters. The operation of CUs, either during cluster formation or data...
Cognitive radio ad hoc networks (CRAHNs) inherit the challenges of both cognitive radio technology and wireless ad hoc networks. In this paper, we investigate the problems of secondary users' network lifetime maximization and interference to primary user (PU) minimization jointly in BER constrained stationary cognitive radio ad hoc networks. To solve the problem a cross layer approach is adopted....
Wireless Mesh Networks (WMN) are considered as robust architecture to provide reliable connectivity to fixed and mobile users. The redundant infrastructure provided by WMN can be efficiently utilized using multipath routing. However, the performance gain of multipath routing mainly depends on efficient path selection protocols. The omni-directional wireless medium, unstable link quality and mutual...
Spectrum trading benefits primary users (PUs) by monetary gains and secondary users (SUs) by spectrum accessing opportunities in cognitive radio networks (CRNs). Unfortunately, most existing spectrum trading designs only focus on the guarantee of economic properties, but forget the wireless transmission nature, especially for multi-hop cognitive radio (CR) communications. In this paper, we propose...
In this paper, we focus on the problem of hierarchical cross- layer dynamic resource allocation for heterogeneous networks with flexible backhaul. We formulate the radio resource management problem as a two timescale non-convex stochastic optimisation problem which jointly optimizes flow control, routing control, interference mitigation and link scheduling in order to maximize a generic network utility...
Channel interference and node mobility cause significant performance degradation to wireless networks. In multichannel multi-flow mobile cognitive ad hoc networks, it becomes even worse due to both unexpected primary user activities and potential interference among multiple flows. In this paper, we propose a Joint Routing and Channel Assignment (JRCA) approach based on delay prediction. Firstly, it...
In this paper we present a novel transmission scheme for wireless multihop backhaul networks. The scheme consists of group successive relaying that efficiently exploits half-duplex relays and a coding scheme that improves quantize-map-and- forward (QMF). We derive an achievable rate region of the proposed scheme and attain a closed-form expression in the asymptotic case for several network models...
In this paper we formulate Network Coding (NC) and Analog Network Coding (ANC) using analytical models to quantify ANC performance parameters. For this reason, a chain topology in a non-mutual transmission was investigated. Our formulations demonstrate the benefit of NC and ANC over traditional approaches which depend on the number of transmission packets and the number of timeslots required for packets...
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