Técnicas de compartilhamento de espectro baseadas em teoria dos jogos para acesso local em sistemas IMT-Advanced

Resumo Ingles

The required bandwidth for the envisioned services in IMT-Advanced local access is much larger than those usually allocated to 2G and 3G services, in the order of 100 MHz. For that reason, it is envisioned that such systems will have to work in an unpaired spectrum environment where the whole spectrum pool is licensed but shared amongst operators. A novel approach based on Game Theory is proposed, dealing with some of the main issues in such a scenario: latency for initial spectrum assignment, self organization, spectrum efficiency and fairness. In order to meet all those requirements, the proposed protocol has two special states. In the new entrant state the protocol makes an efficient initial spectrum assignment aiming at reduced latency. In the second protocol state, the game is repeated to track load variations, provide long term fairness and enhance the spectrum efficiency. The results show that the proposed framework is capable of providing spectrum efficiency considerably higher than simple approaches for uncoordinated deployment, such as full reuse or having separate spectrum pools. In fact, in the studied scenario, our approach approximates the spectral efficiency of the optimal spectrum planning for full load while tracking traffic variations and self adapting for the number of active base stations.