5G多站定位精度分析与提升方法

doi:10.11959/j.issn.2096-3750.2023.00342

Abstract

Abstract:

RAT-dependent is a satellite independent positioning technology of 5G.3GPP gives the Cramer-Rao lower bound (CRLB) of the positioning accuracy under the ideal condition of a single station and the simulation positioning accuracy of multi-station under different network configurations.Based on the actual network conditions, the analysis framework, accuracy range of multi-station positioning accuracy and the corresponding improvement method were proposed.The experimental results show that the RAT-dependent positioning accuracy is closely related to network technologies, and the positioning accuracy of the optimized scheme can be improved by 20%～30% compared with the non-optimized scheme.

Key words: 5G, RAT-dependent positioning, positioning accuracy

CLC Number:

TN929.5

Feilong ZHAO, Lili WANG. Multi-station positioning accuracy and enhancement method for 5G[J]. Chinese Journal on Internet of Things, 2023, 7(3): 95-102.

Figures/Tables 7

参数	3GPP规范名称	取值
工作频段		2 600 MHz
载波带宽	${CBW}_{PRS}^{}$	100 MHz
子载波带宽（SCS）	Δf	30 kHz
PRS占用RB数^①	$N_{RB}^{PRS}$	24
梳齿尺寸	$K_{comb}^{PRS}$	6
PRS单时隙符号数	$L_{PRS}$	6
PRS发射周期	$T_{per}^{PRS}$	160 ms
PRS重复次数	$T_{rep}^{PRS}$	1
注：① $N = 12 \cdot N_{RB}^{PRS}$

References 31

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对比项	GPS	基于NTP^①的网络时钟	北斗	原子钟	IEEE 1588v2
典型授时精度	20 ns	10 ms	100 ns	10 ns	100 s
锁定时间	40 s	30 ns	60 s		60 ns
可靠性	中	高	中	高	高
注：①网络时钟协议（NTP, network time protocol）

	实验1	实验2	实验3	实验4	实验5
方案	单站TOA	单站TOA	多站OTDOA	多站OTDOA	改进OTDOA
	（无优化LOS径）	（有优化LOS径）	（非云化）	（云化）
对应站点拓扑	图4(a)	图4(a)	图4(a)	图4(b)	图4(c)
TRP时钟同步精度	±190 ns	±190 ns	±520 ns	±260 ns	±65 ns
提升技术	对比基准	提升FAP^①	+提升GDOP	++提升同步精度	++进一步提升同步精度
密集城区-方差	173.02	126.75	83.31	66.11	63.23
开阔农村-方差	111.67	110.22	69.56	58.74	58.03
注：①第一到达路径（FAP, first arrival path）

Multi-station positioning accuracy and enhancement method for 5G

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