Call For Paper Volume:4 Issue:8 Aug'2017 |

MINIMIZING INTERFERENCE BY SHARING SPECTRUM IN LTE-A USING GAME THEORY

Publication Date : 01/03/2016



Author(s) :

S.INDHUMATHI , R.SELVARAJ , V.ELAVARASI.


Volume/Issue :
Volume 3
,
Issue 2
(03 - 2016)



Abstract :

Improving capacity and coverage is one of the main issues in next-generation wireless communication. Heterogeneous networks (HetNets), which is currently investigated in LTE-Advanced standard, is a promising solution to enhance capacity and eliminate coverage holes in a cost-efficient manner. A HetNet is composed of existing macrocells and various types of small cells. By deploying small cells into the existing network, operators enhance the users’ quality of service which are suffering from severe signal degradation at cell edges or coverage holes. Nevertheless, there are numerous challenges in integrating small cells into the existing cellular network due to the characteristics: unplanned deployment, intercell interference, economic potential, etc. Recently, game theory has been shown to be a powerful tool for investigating the challenges in HetNets. Several game-theoretic approaches have been proposed to model the distributed deployment and self-organization feature of HetNets. In this chapter, the authors first give an overview of the challenges in HetNets. Subsequently, the authors illustrate how game theory can be applied to solve issues related to HetNets. In this study, the authors address the spectrum sharing problem in a HetNet composed of a macrocell and several femtocells. They propose a new approach in which macrocell and femtocells can simultaneously share the available bandwidth, while avoiding the intra-tier interference and helping the macrocell to offload by expanding the cell range of some femtocells. The author’s approach is formulated ass a Stackelberg game, in which the macrocell is selling bandwidths to femtocells in exchange of some victim macro-users to serve, mainly the macro-users who undergo severe interference from the neighbouring femtocells. They demonstrated that their game theoretic reaches a stable state called Stackelberg equilibrium analytically and by simulations. More importantly, they show that overall network performance is improved in terms of total femtocells’ throughputs and spectral efficiency of the macro-users who are in the vicinity of the femtocells.


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MINIMIZING INTERFERENCE BY SHARING SPECTRUM IN LTE-A USING GAME THEORY

February 12, 2016