对5G-NR信号中SIB的非合作码流提取与信令解析

Non-Cooperative Code Stream Extraction and Signaling Analysis of SIB in 5G-NR Signals

在5G-NR下行链路侦收中对SIB(System Information Block)进行码流提取与信令解析是后续5G终端随机接入过程分析的重要前提,同时也是实施5G通信终端管控的必要过程。针对这一需求,采用包络检波与时频分析等方法,在快速完成SSB(Synchronization Signal Block)突发集配置模式判断后,利用主信息块的信令快速寻找到对应的CORESET(Control Resource SET),并通过解析CORESET中承载的下行控制信息定位出携带SIB的物理下行共享信道时频位置,最终经过解调解码提取出SIB的码流与信令。最后针对中国电信与中国移动5G基站采集下行信号,成功提取SIB的码流与信令,验证所用方法的有效性,从而为后续5G终端管控设备的研制提供重要参考。

Stream extraction and signaling analysis of SIB in the downlink detection of 5G-NR are important prerequisite for the random access process analysis of 5G terminals.It is also a necessary process to implement control on 5G communication terminals.For this demand,the methods of envelope detection and short-time Fourier transform are used to quickly determine the configuration mode of synchronization signal burst,and the signaling of the main information block is used to look for the corresponding CORESET quickly.By analyzing the downlink control information in CORESET,the time-frequency position of the physical downlink shared channel carrying SIB is located,and the code stream and signaling of SIB are extracted through demodu-lating and decoding.Finally,the downlink signal of the 5G base station of China Telecom and China Mobile are collected,and the code stream and the signaling of the SIB are extracted suc-cessfully to verify the effectiveness of the method.