基于LTE测量报告的2.1 GHz和3.5 GHz 5G SA覆盖评估方法

doi:10.11959/j.issn.1000-0801.2022032

Abstract

Abstract:

2.1 GHz refarming is a key issue for the evolution of 5G network.Limitations of network simulation were analyzed.Since most of 5G sites were co-sited with LTE and adopted the same or similar engineering parameters, an approach of 2.1 GHz and 3.5 GHz 5G SA network coverage evaluation was proposed.A co-site coverage differential model between 2.1 GHz and 3.5 GHz 5G SA was given and its accuracy was verified by field trial.Then the coverage of two frequencies were predicted based on LTE MR, the differential model and the uplink rate curve relative to link loss.The evaluation instance indicates only 1.3～5.2 pp coverage gain is achieved at uplink rate between 1 Mbit/s and 10 Mbit/s by refarming 2.1 GHz within 20 MHz bandwidth, because of the 10 dB margin of LTE coverage.

Key words: 2.1 GHz refarming, 5G SA coverage, measurement report, beamforming

CLC Number:

TN929.5

Jianxian LU, Jiqiu HUANG, Mingxing HU, Henghua LIN. An approach of LTE measurement report based 2.1 GHz and 3.5 GHz 5G SA coverage evaluation[J]. Telecommunications Science, 2022, 38(6): 131-142.

Figures/Tables 18

References 22

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建筑类型	高层建筑	普通建筑	大型建筑	其他
穿透损耗/dB	19.8	15.9	23.0	12.0
室内每米损耗/dB	0.76	0.54	1.15	0.66

	数据来源		仿真结果		MR统计
	用户分布		全部室外	室内70%	全部室内	实际分布
	RSRP均值/dBm		-79.21	-87.71	-91.34	-92.13
RSRP分布		≥-85	71.19%	44.18%	32.60%	26.36%
		-110～-85	27.63%	49.98%	59.57%	70.58%
		<-110	1.18%	5.84%	7.83%	3.06%

工参	均值	标准差	说明
天线挂高/m	-2.3	5.8	88%的5G小区和LTE小区的天线挂高差绝对值小于5 m
方向角	-0.6°	24.2°	74%的5G小区和LTE小区的天线方向一致
下倾角	1.7°	3.4°	75%的5G小区和LTE小区的天线下倾角差的绝对值小于4°
注：天线挂高差=3.5 GHz天线挂高-2.1 GHz天线挂高，方向角和下倾角差也按相同方式计算。

频段		3.5 GHz	2.1 GHz
基站	天线配置	64T64R	4T4R
	天线增益/dBi	25	17
	噪声系数/dB	3.5	2.5
	馈线损耗/dB	0	1
终端	天线配置	2T4R	1T4R
	发射功率/dBm	26	23

场景		均值/dB	标准差/dB
室外	站高6 m	5.50	4.10
	站高40 m	6.50	7.36
室内	住宅楼	11.90	5.78
	商用楼	11.79	5.48
临街商铺		8.03	4.17

An approach of LTE measurement report based 2.1 GHz and 3.5 GHz 5G SA coverage evaluation

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References 22

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链路损耗差/dB		均值	标准差
室外		-3.38	5.22
室内	住宅	3.18	5.13
	商用楼	3.44	5.05
	临街商铺	-0.33	3.67

方位	主瓣方向	偏离主瓣60°	差值
链路损耗差/dB	1.05	-2.16	3.21

场景	挂高/m	方向	下倾		SSB RSRP差异/dB
场景	挂高/m	方向	下倾	实测值	模型预测值	误差
基准	63	230°	10°	-91.06	—	—
方向调整	63	220°	10°	-0.82	-0.59	0.23
		200°	10°	-3.67	-4.45	-0.78
		170°	10°	-10.09	-11.77	-1.67
下倾调整	63	230°	7°	-3.05	-2.24	0.81
		230°	13°	-3.00	-1.24	1.76
高度调整	58	230°	10°	-0.85	-0.88	-0.03

频段/GHz	带宽/MHz			上行速率覆盖率
频段/GHz	带宽/MHz	30 Mbit/s	20 Mbit/s	10 Mbit/s	5 Mbit/s	3 Mbit/s	1 Mbit/s
2.1	20	47.3%	65.2%	80.5%	91.9%	93.5%	99.3%
	10	25.0%	50.9%	77.8%	87.9%	91.9%	99.0%
3.5	100	61.4%	67.3%	80.5%	86.7%	90.0%	97.7%

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频段/GHz	5G网络驻留比
2.1	99.9%
3.5	98.5%