异质节点分离CRSN中MAC协议设计与性能分析

Design of MAC protocol and performance analysis for heterogeneous nodes separating CRSN

认知无线传感器网络(CRSN)是一种将认知无线电(CR)技术引入传统WSN中的新型网络,具有一定的应用价值和发展前景。然而,CRSN中的认知功能带来的额外能耗和处理要求及其高成本实现,阻碍了它的进一步发展及应用。基于此,提出将认知功能迁移到另外一类节点——认知节点,并使其拥有较强的处理能力和能量收集能力。认知节点与普通传感器节点按照一定比例进行部署,组成另外一种新型网络——异质节点CRSN(HT-CRSN),这种新型网络能够提高网络性能并降低部署成本。并提出了一种能够适用于这种异质节点传感器网络的工作时序及其一系列可行性的MAC协议(FBP等)。通过对所提MAC协议的能耗分析,说明可以通过调整两类异质节点的部署比例和能量收集速率均衡两类异质节点的能耗,进而提高网络生命周期。

Cognitive wireless sensor network（CRSN） is a new type of network that introduces cognitive radio（CR） technology into traditional WSN, and has certain application value and developmental prospect. However, the additional energy consumption, processing requirements and its high cost implementation have hindered its further development and application. Based on this, transfering cognitive functions to another nodes——cognitive nodes which have ability of processing and collecting energy was proposed. The cognitive nodes were deployed with the ordinary sensor nodes according to the certain proportion. They form a new type of network——heterogeneous node CRSN（HT-CRSN）. The new network can improve network performance and reduce the deployment cost. Then a work schedule which can be applied to this kind of heterogeneous node sensor networks and a series of feasible MAC protocols was proposed. The analysis of the proposed MAC protocol proves that energy consumption can be balanced by adjusting the deployed ratio of the two kinds of heterogeneous nodes and the network life cycle is improved.