基于隐藏终端的时隙802.15.4网络吞吐量研究

Study on throughput in slotted 802.15.4 network based on hidden terminal

为了提高802.15.4网络吞吐量性能,设计了一种改进的节点状态转换过程,提出了一种考虑隐藏终端问题和重传的节点接入信道模型,并对模型进行分析计算。基于计算结果和信道状态模型分析,对考虑隐藏终端问题的数据碰撞概率、丢包率和网络吞吐量进行推导。最后研究了数据包到达率、退避指数和隐藏终端对网络吞吐量性能的影响。实验表明,模型较好地描述了节点接入信道过程,能够对网络吞吐量进行精准的动态分析。实验结果表明,与无重传机制的802.15.4网络相比,网络吞吐量增加了83.9%左右。与部分条件休眠的方法比较,网络吞吐量平均增加了13.3%,提出的模型能够有效提升网络吞吐量性能。

To increase the performance of throughput for 802.15.4 network,this paper designed an improved process of node state transition.Moreover,it proposed a model of node access channel considering the hidden terminal problem and retransmission,and it carried out the analysis and calculation of model.Based on the calculation results and the analysis of channel state model,then,it gave out the derivations of the data collisions probability,packet lost rate and throughput channel considering the hidden terminal problem.Finally,this paper studied the impact of packet arrival rate,back off exponent and hidden terminal on the performance of network throughput.Experimental results show that,compare with 802.15.4 network without retransmission mechanism,the network throughput is increased by 83.9%or so.Compare with the sleep methods under some conditions,the network throughput is increased by 13.3%on average,the proposed model can effectively improve network throughput performance.