Uma proposta de melhoria de protocolo de controle de acesso ao meio para redes de rádios cognitivos

Abstract

The fixed spectrum allocation policy in wireless networks has become increasingly unfeasible due to the exponential increases in the number of accesses and in the traffic. To solve this problem the cognitive radio was proposed, which provides an opportunistic access to the spectrum This paper presents some MAC protocols for cognitive radios that aim to control how users make access to the shared medium. From the study os the MAC protocols proposed in the literature, we propose an improvement in a particular protocol that results in an increased throughput and decrease the delay and jitter in the network.