高铁5G NR参数配置方法

首先分析了对于高铁覆盖,在不同速度和频率条件下的最大多普勒频移,然后给出了不同频段的子载波间隔配置原则和配置建议,建议在1.8 GHz频段和2.1 GHz频段,子载波间隔配置为15 kHz,在2.6 GHz频段和3.5 GHz频段,子载波间隔配置为30 kHz,最后给出了PRACH和DM-RS的配置原则和配置建议,建议长序列的PRACH子载波间隔优先配置为5 kHz,根据最大多普勒频移的不同,长序列的PRACH配置为非限制集、限制集A和限制集B;根据最大多普勒频移的不同,DM-RS数量配置为1个、2个、3个或4个。

The Parameter Configuration Method of 5G NR in High-speed Railway

Firstly,this paper analyzes the maximum Doppler shift for different speeds and frequencies in the high-speed railway.Secondly,this paper offers the confi guration principle and suggestion of sub-carrier spacing for different frequencies,suggesting that the sub-carrier spacing is 15kHz in 1.8GHz and 2.1GHz,and the sub-carrier spacing is 30kHz in 2.6GHz and 3.5GHz.Finally,this paper offers the confi guration principle and suggestion of PRACH and DM-RS.Specifi cally,the sub-carrier spacing of PRACH is suggested to be 5kHz preferably for the long sequence PRACH,and according to different maximum Doppler shifts,the long sequence PRACH is confi gured to be the unrestricted set,restricted set type A or restricted set type B,and the number of DM-RS is 1,2,3 or 4.