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In this paper, we present a game theoretic framework for spectrum allocation in distributed cognitive radio networks containing both unicast and broadcast traffic. Our proposed scheme aims to minimize broadcast latency for broadcast traffic and minimize interference and access contention for both types of traffic. We develop a utility function that ensures that both objectives are met yielding a higher...
In recent times, wireless communications has established itself as a popular access technology due to the user preference for the flexibility of untethered communication. The single biggest problem that still impedes broader uptake of wireless technology is scarceness of wireless capacity. The lack of wireless capacity scaling is primarily due to two factors: firstly, wireless interference that limits...
The rising density of wireless devices, combined with the availability of a plethora of wireless web applications, has overcrowded the radio frequency spectrum. Majority of the present wireless radio spectrum is already licensed; however, studies have shown that the licensed spectrum is significantly underutilized. Cognitive Radio Networks (CRNs) are envisioned to utilize the radio spectrum more efficiently...
During the past few years, cognitive radio networks (CRNs) have emerged as a solution for the problems created due to fixed spectrum allocation such as inefficient usage of licensed spectrum. CRNs aim at solving this problem by exploiting the spectrum holes (the spectrum not being used by primary radio nodes at a particular time) and allocating the spectrum dynamically. In this paper, we address the...
Failure of backbone nodes/links can have catastrophic consequences unless they are addressed in a timely manner. Multi-Protocol Label Switching (MPLS), is an increasingly popular technology that employs various recovery mechanisms from such failures. In addition to failure recovery these mechanisms minimize downtime, data loss and convergence time while also avoiding inefficient bandwidth utilization...
Recently, a variant of the popular wireless mesh network (WMN) technology, in which nodes communicate over multi-hop wireless links, has been proposed to address the problem of wireless interference and the scarcity of wireless spectrum. Such networks, which we shall call cognitive-radio wireless mesh networks (CWMN), can dynamically adapt network parameters according to existing conditions of the...
Delay Tolerant Networks (DTN) are a class of networks that lack continuous connectivity between nodes due to limited wireless radio coverage, widely scattered mobile nodes, constrained energy resources, high levels of interference or due to some other similar channel impairment. Examples of such networks are those operating in mobile networks or extreme terrestrial environments, or simply as planned...
We address the problem of minimizing the worst-case broadcast delay in multi-rate wireless mesh networks (WMN) in a distributed and localized fashion. Efficient broadcasting in such networks is especially challenging due to the multi-rate transmission capability and the interference between wireless transmissions of WMN nodes. We propose connecting dominating set (CDS) based broadcast routing approach...
We address the problem of minimizing the worst-case broadcast delay in multi-radio multi-channel multi-rate (MR2-MC) wireless mesh networks (WMN). The problem of 'efficient' broadcast in such networks is especially challenging due to the numerous interrelated decisions that have to be made. The multi-rate transmission capability of WMN nodes, interference between wireless transmissions, and the hardness...
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