Traffic-Aware Dynamic Spectrum Access

Abstract

Abstract-Demand-driven spectrum allocation can drastically improve performance for WiFi access points struggling under increasing user demands. While their frequency agility makes cognitive radios ideal for this challenge, performing adaptive spectrum allocation is a complex and difficult process. In this work, we propose FLEX, an efficient spectrum allocation architecture that efficiently adapts to dynamic traffic demands. FLEX tunes network-wide spectrum allocation by access points coordinating with peers, minimizing network resets through local adaptations. Through detailed analysis and experimental evaluation, we show that FLEX converges quickly, provides users with proportional-fair spectrum usage and significantly outperforms existing spectrum allocation proposals.

Arquitecturas de radio cognitiva: una revisión actual

“…En [47] los autores proponen FLEX, una arquitectura distribuida para Access point de WiFi, la cual realiza la localización del espectro y eficientemente se adapta a las demandas de tráfi co dinámico, de forma que se maximice la satisfacción del usuario.…”

Improving Data Dissemination in Multi-hop Cognitive Radio Ad-Hoc Networks

“…Recently, a lot of work has been carried out for dynamic channel management in cognitive radio networks [3,4,5,15,20,25,26]. However, all these approaches focuses on single-hop cognitive radio networks and either requires the presence of any central entity or coordination with primary radio nodes in their channel selection decision.…”

“…However, all these approaches focuses on single-hop cognitive radio networks and either requires the presence of any central entity or coordination with primary radio nodes in their channel selection decision. For instance, [3] proposed an efficient spectrum allocation architecture that adapts to dynamic traffic demands but they considered a singlehop scenario of Access Points (APs) in Wi-Fi networks. An approach that use non-continuous unoccupied band to create a high throughput link is discussed in [4].…”

“…A lot of works have been carried out for dynamic channel management in CRNs. These approaches focus on single-hop CRNs [2,3,4,5], the presence of central entity, or the coordination with PR nodes in their channel selection decision. A proposal/solution related to our approach is Selective Broadcasting (SB) [6], however, SB requires more than one transceiver, resulting in bigger and more complex devices, as for military applications [7].…”

Efficient and Fair Bandwidth Allocation in Multichannel Cognitive Radio Networks

“…The bandwidth allocation problem is not addressed either. A brief of some other works includes dynamic traffic driven spectrum allocation [28], combinatorial multiarmed banditbased spectrum allocation [29], and distributed spectrum allocation for sequentially arriving SUs [30]. Neither of these works addresses the impact of PU activity, the tradeoff between instantaneous transmission rate and switching overhead, and optimal bandwidth selection.…”