一种基于更新理论的无线传感器异构机制性能分析  

New renewal model for CSMA/CA scheme with heterogeneous unsaturated conditions

作　　者：吕春峰[1] 朱建平[1,2] 

机构地区：[1]上海交通大学电子信息与电气工程学院,上海200240 [2]云南民族大学电子信息工程学院,昆明650093

出　　处：《电子测量技术》2012年第8期86-89,97,共5页Electronic Measurement Technology

摘　　要：近几年来,无线传感器网络的概念已经逐渐渗透到了无线通信的各个应用领域;而对于大部分无线传感器异构网络,其性能分析、性能改进都是建立在优先等级的基础上的。为了提高非优先等级的异构网络的性能,提出了一种新的基于更新理论的异构CSMA/CA机制模型。该模型在很大程度上提高了异构网络的公平性、实时性,并且在异构程度较高的场合吞吐量特性也得到了提高。其最大的特点是所有节点被赋予了公平的机会来竞争访问信道,而不存在优先权的问题。通过大量的理论分析、比较,并且结合NS-2仿真验证,该机制的分析结果与采用NS-2工具仿真的结果十分吻合。WSNs play more and more decisive roles in various aspects, especially after the successful release of IEEE 802.15.4 standard,and most analyses of heterogonous WSNs focus on prioritized traffic. In this paper,we propose a new CSMA/CA scheme based on renewal theory to analyze and improve the performance of the heterogeneous unsaturated traffic. Analysis and simulation results show that delay and fairness of this scheme are improved largely, while throughput is improved in more heterogeneous situations. The distinguishing characteristic of this scheme is that the heterogeneous traffic is bestowed non-priority over each other regardless of types. Comprehensive simulation results are consistent with the predictions of these models.

关 键 词：无线传感器网络 更新理论 性能分析 NS-2仿真 

分 类 号：TN925[电子电信—通信与信息系统]