摘要
邻居发现是基于定向天线的无线自组织网络MAC协议设计的难点问题.针对节点定向传输条件下邻居发现过程中的冲突问题进行分析,在分析的基础上提出一种基于模型优化的定向时分邻居发现机制.该机制采用马尔科夫链对波束对准请求帧发送过程中的随机退避机制建模,得出稳态概率表达式,进而结合几何计算的方法得出波束扫描对准概率的表达式,并根据概率表达式实现参数联合优化分析.数值模拟与分析结果证明,与现有的典型定向时分邻居发现机制相比,该机制可以有效提高节点定向传输条件下的邻居发现效率.
Neighbor discovery is the difficult issues of the MAC protocol design which is based on the directional antennas in wireless Ad hoc networks. After analyzing the conflict problem during neighbor discovery in the directional transmission condition, we put for- ward a directional neighbor discovery mechanism based on the model of optimization. This mechanism adopts Markov chain to model the random back-off state when beam aligns and the request frame is in transmit, and then obtains the probability expressions of steady state, and finally combines the geometric calculation method to obtain the expression of probability of beam alignment, and according to the probability expression analyzes the joint optimized parameters. The numerical simulation and analysis of result show that this mechanism can effectively improve the efficiency of neighbor discovery in directional transmission condition compared with the exist- ing typical directional time division access neighbor discovery mechanism.
出处
《小型微型计算机系统》
CSCD
北大核心
2016年第10期2226-2231,共6页
Journal of Chinese Computer Systems
基金
国家自然科学基金项目(61100195)资助
江苏省自然科学基金项目(K2014041565)资助
南京航空航天大学基本科研业务费项目(NJ20150014)资助
中国航天科技集团公司卫星应用研究院创新基金项目(2014_CXJJ-TX_09)资助
关键词
定向自组织网络
时分接入
邻居发现
建模分析
directional Ad Hoc networks
time division access
neighbor discovery
modeling analysis
作者简介
张雅静。女,1991年生,硕士研究生,主要研究方向为无线通信网络
雷磊(通信作者),男,1981年生,博士,副教授,研究方向为无线通信网络、协作通信技术;E-mail:leilei@nuaa.edu.cn
朱钢。男,1963年生,硕士,副教授,研究方向为编码理论
董涛,男,1975年生,博士,研究员,研究方向为多媒体网络通信.