分布式天线系统中PCF MAC协议的重传性能优化

发布时间：2018-06-09 21:22

本文选题：分布式天线系统 + 点协调机制　；参考：《电讯技术》2016年10期

【摘要】：为应对分布式天线系统在高用户密度场景下冲突严重的问题,研究了分布式天线系统结构中应用IEEE 802.11点协调机制(PCF)的媒体接入效率,分析了在保持信标帧中参数CFPMax Duration(Contention Free Period Max Duration)与CFPPeriod(Contention Free Period Period)比例的前提下平均重传次数与CFPPeriod的关系。分析了CFPPeriod的变化对节点(STA)间公平性及网络流量密度的影响,考虑从改善重传性能的角度调节信标帧间隔CFPPeriod,并使用OPNET平台进行仿真分析,验证了在保持参数CFPMax Duration与CFPPeriod比例的条件下平均重传次数随CFPPeriod的增大先减小后增大的结论。仿真结果表明,当固定CFPMax Duration/CFPPeriod为0.5时,在0.02~0.04 s之间选取CFPPeriod既能保证节点间公平性,也能减少在竞争阶段(CP)发送数据的节点数目,从而有效降低重传次数。
[Abstract]:In order to cope with the serious conflict of distributed antenna systems in high user density scenarios, the media access efficiency of the IEEE 802.11 point coordination mechanism (PCF) is studied in the structure of distributed antenna system. The parameters CFPMax Duration (Contention Free Period Max Duration) and CFPPeriod (Contention Free) are analyzed. The relationship between the average retransmission times of D Period and the CFPPeriod is analyzed. The influence of the CFPPeriod changes on the fairness and network traffic density between nodes (STA) is analyzed, and the frame interval CFPPeriod of the beacon is adjusted from the angle of improving the retransmission performance, and the simulation analysis is carried out using the OPNET platform to verify that the parameter CFPMax Duration is maintained. The average retransmission number of the CFPPeriod ratio decreases first and then increases with the increase of CFPPeriod. The simulation results show that when the fixed CFPMax Duration/CFPPeriod is 0.5, the selection of CFPPeriod between 0.02~0.04 s can not only ensure fairness among nodes, but also reduce the number of nodes sending data in the competition order (CP), thus effectively reducing the number of nodes. Low retransmission times.
【作者单位】：国防科学技术大学电子科学与工程学院;
【基金】：国家自然科学基金资助项目(61401492)~~
【分类号】：TN915.04

【相似文献】