基于OPNET的DMR随机接入算法的仿真研究

DMR Random Access Algorithm Simulation and Research Based on OPNET

在OPNET平台上建立了DMR(Digital Mobile Radio)集群基站控制信道随机接入的模型,并根据DMR空口协议各种呼叫类型的空口占用特点及其发生概率,对随机接入中的各种退避算法进行了仿真,比较了线性退避算法和二进制退避算法,通过仿真得出在二进制退避算法下,DMR集群控制信道中的随机接入具有更好的吞吐率和延时等综合性能。

A DMR Trunking Site Control Channel（TSCC） random access model had been set up based on OPNET platform.According to the diversified call types and their probabilities on DMR air interface,linear backoff algorithm and binary exponential backoff algorithm were emulated,analyzed and compared.Emulation results show that the binary exponential random access backoff algorithm throughput rate and average access delay specification was better than the linear one on the DMR TSCC.