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RAT Selection Optimization in Heterogeneous Wireless Networks

  • Angelos Rouskas
  • Pavlos Kosmides
  • Anastassios Kikilis
  • Miltiades Anagnostou
Part of the Lecture Notes of the Institute for Computer Sciences, Social Informatics and Telecommunications Engineering book series (LNICST, volume 66)

Abstract

While wireless access networks are rapidly evolving, constantly increasing both in coverage and offered bandwidth, the vision for Next Generation Wireless Networks (NGWNs) encompasses a core network incorporating various Radio Access Technologies (RATs) in a unified and seamless manner. In such an environment, providers with multi-RAT technologies will aim at the maximization of the satisfaction of their subscribers, while attempting to avoid overloading their subsystems. In this paper we deal with the network selection problem in a multi-RAT environment where users are equipped with multimode terminals. We introduce a utility-based optimization function and formulate the problem of allocating user terminals to RATs as an optimization problem under demand and capacity constraints. This problem is recognized as NP-hard and we propose an optimal Branch and Bound (BB) algorithm, as well as a greedy heuristic which exploits a metric that measures the utility gained versus the resource spent for each allocation. BB manages to significantly reduce the search procedure, while greedy produces optimal allocation results similar to BB but with very low computational cost.

Keywords

Next Generation Wireless Networks network selection optimization Branch and Bound 

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Copyright information

© ICST Institute for Computer Science, Social Informatics and Telecommunications Engineering 2012

Authors and Affiliations

  • Angelos Rouskas
    • 1
  • Pavlos Kosmides
    • 2
  • Anastassios Kikilis
    • 3
  • Miltiades Anagnostou
    • 2
  1. 1.Department of Digital SystemsUniversity of PiraeusPiraeusGreece
  2. 2.School of Electrical and Computer EngineeringNational Technical University of AthensAthensGreece
  3. 3.Department of Information and Communication Systems EngineeringUniversity of the AegeanKarlovassiGreece

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