基于改进Welsh Powell的NPRACH子载波偏置自配置算法  

NPRACH Subcarrier Offset Self-Configuration Algorithm Based on Improved Welsh Powell

作　　者：黄炎水 谢佳锐 HUANG Yanshui;XIE Jiarui(Jieyang Branch of China Mobile Communication Group Guangdong Co.,Ltd.,Jieyang 522000,Chin)

机构地区：[1]中国移动通信集团广东有限公司揭阳分公司,广东揭阳522000

出　　处：《移动通信》2018年第8期46-51,共6页Mobile Communications

摘　　要：在窄带物联网的随机接入过程中,基站通过时频资源区分不同用户,而用户采用的时频资源的配置取决于随机接入信道配置中的时域偏置和子载波偏置配置。测试表明,存在重叠覆盖区域的两个小区采用相同子载波偏置时,会产生较大的时频资源浪费,影响用户接入。根据随机接入信道子载波偏置配置的特性,子载波偏置问题可以抽象为点着色问题,基于改进Welsh Powell的NPRACH子载波偏置自配置算法可以解决子载波偏置配置的问题。通过这一算法,可以实现随机接入信道子载波偏置的自配置,避免小区间随机接入消息的误判,提升小区接入性能。In the random access process of NB-IoT, eNB distinguishes different users by time-frequency resources which are dependent on the configurations of time-domain offset and subcarrier offset in NPRACH configuration. The test results show that the adoption of the same subcarrier offset for the two cells with overlapping areas will result in the waste of time-frequency resources and affect user access. According to the characteristics of subcarrier offset configuration of random access channel, the subcarrier offset can be abstracted as a point coloring problem which can be solved by NPRACH subcarrier offset self-configuration algorithm based on improved Welsh Powell. The algorithm can achieve the self-configuration of subcarrier of random access channel, avoid the misjudgment of random access message between cells and improve the cell access performance.

关 键 词：窄带物联网 随机接入信道 子载波偏置 点着色 WELSH POWELL算法 

分 类 号：TN929.5[电子电信—通信与信息系统]