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Author(s): Fausto José Canhoto de Paiva Vieira
María Ángelez Vazquez Castro
Title: Tunable fairness-based capacity allocation for satellite systems with adaptive physical layer
Issue Date: 2005
Abstract: Systems with an adaptive physical layer make use of the channel conditions informationin order to adapt their transmission to the channel with adaptive coding and modulation(ACM) techniques. The adaptability of the physical layer introduces new challenges as wellas degrees of freedom in the higher layers since the system no longer has a fixed capacity butthe capacity becomes time-and-location dependant. This adaptability also has a huge impactin the capacity allocation since the resource is not constant anymore. Moreover, a mainchallenge lies in providing Quality-of-Service (QoS) suitable for multimedia applicationsmeeting at the same time the required Service Level Agreements (SLA). This situationrequires the development of powerful and dynamic strategies for adaptive capacityallocation. In this paper, we present a novel adaptive capacity allocation solution toconciliate the higher resources needs of users that require higher levels of protection (lowerspectral efficiencies), with the ability of offering higher throughput to users that requirelower levels of protection (higher spectral efficiencies). We have developed a capacityallocation algorithm that introduces fairness as a tunable parameter. This approach makes itpossible to adapt the resource manager behavior at any moment in order to guarantee thefulfillment of short-term and long-term user requirements in presence of time-and-locationvariant capacity. The proposed algorithm also supports differentiation of services thatcomply with the requirements for implementing QoS. An example scenario is proposed andsystem performance is computed as a function of the tunable fairness index and comparedagainst other approaches. Our results show that tunable fairness is an effective schedulingtool for broadand satellite systems with adaptive physical layer.
Subject: Tecnologia de satélites, Engenharia electrotécnica, electrónica e informática
Satellite technology, Electrical engineering, Electronic engineering, Information engineering
Scientific areas: Ciências da engenharia e tecnologias::Engenharia electrotécnica, electrónica e informática
Engineering and technology::Electrical engineering, Electronic engineering, Information engineering
Source: ICSSC'05
Document Type: Artigo em Livro de Atas de Conferência Internacional
Rights: restrictedAccess
Appears in Collections:FEUP - Artigo em Livro de Atas de Conferência Internacional

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