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Contention Based Multichannel MAC Protocol for Distributed Cognitive Radio Networks

机译:分布式认知无线电网络中基于竞争的多信道MAC协议

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Design of an efficient medium access control protocol is critical for proper functioning of a distributed cognitive radio network and better utilization of the channels not being used by primary users. In this paper, we design a contention based distributed medium access control (MAC) protocol for the secondary users’ channel access. The proposed MAC protocol allows collision-free access to the available data channels and eventually their utilization by secondary users, with spectrum sensing part being handled by exclusive sensing nodes. We further introduce the provision of reservation of free channels by secondaries for extended periods to increase utilization without causing harmful interference to primaries. We demonstrate how such extended access to resources can be tuned to provide differential quality of service to the secondary users. The effectiveness of the protocol is evaluated by performing analysis and simulation. We use blocking probability, secondary usage of a secondary user and performance degradation caused to primary incumbents as performance metrics. We obtain the conditions for such extended access and try to gauge the resulting increase in utilization. Under optimal conditions, the proposed scheme enables the secondary network to utilize all available channels. The proposed scheme is shown to outperform the most sophisticated existing MAC schemes for distributed secondary networks.
机译:有效的媒体访问控制协议的设计对于分布式认知无线电网络的正常运行以及更好地利用主要用户未使用的信道至关重要。在本文中,我们为次级用户的信道访问设计了一种基于竞争的分布式媒体访问控制(MAC)协议。所提出的MAC协议允许对可用数据信道的无冲突访问,并最终由二级用户利用它们,而频谱感测部分则由排他的感测节点处理。我们进一步引入了由次级服务器提供免费频道保留的延长期限,以提高利用率,而不会对初级服务器造成有害干扰。我们演示了如何调整对资源的这种扩展访问,以为辅助用户提供不同的服务质量。通过执行分析和仿真来评估协议的有效性。我们将阻塞概率,次要用户的二次使用以及主要用户造成的性能下降用作性能指标。我们获得了此类扩展访问的条件,并尝试评估由此带来的利用率提高。在最佳条件下,提出的方案使辅助网络能够利用所有可用信道。所提出的方案显示出优于用于分布式次级网络的最复杂的现有MAC方案。

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