关键词: 接入控制,分布式认知无线电网络,分布式MAC协议,多信道MAC协议,服务质量

Abstract: The insufficence of dynamic resource availability and the lack of central control unit offer many challenges when designing MAC protocol for a distributed cognitive radio network.In this paper,we proposed a novel MAC design for distributed cognitive radio network which provides an efficient approach to address quality of service (QoS) requirements of delay sensitive applications by defining higher priority to such applications during channel reservation.It also combats other major challenges such as low utilization of spectrum and multi-channel hidden terminal problem.We developed an analytical framework to study the performance of the proposed protocol.We then compared the performance of proposed protocol with those of two existing protocols.Comparison results show that the proposed MAC outperforms the existing protocols by providing better throughput.The results achieved from the analytical model and validated by simulations show that our simple yet efficient design identifies and fulfils the QoS requirements of delay sensitive applications,achieves excellent spectrum utilization and handles multi-channel hidden terminal problem effectively.

Key words: Admission control,Distributed CR network,Distributed MAC,Multi-channel MAC,Quality of service