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

摘要/Abstract

摘要：

2.1 GHz频段重耕是城区5G网络部署需要研究的重要课题。分析了仿真预测网络覆盖存在的缺陷。考虑绝大部分5G基站与LTE同址并采用相同或相似工参的情况，提出了基于LTE 测量报告的2.1 GHz和3.5 GHz 5G SA覆盖评估方法。该方法首先建立同址2.1 GHz和3.5 GHz 5G SA覆盖差异模型并通过测试验证其准确性，然后根据LTE测量报告、覆盖差异模型及速率与链路损耗关系评估两个频段的覆盖质量。评估实例表明，因城区LTE网络覆盖具有10 dB余量，同址20 MHz带宽内的2.1 GHz 5G重耕仅在1～10 Mbit/s上行速率覆盖率较3.5 GHz有1.3～5.2个百分点的增益。

关键词: 2.1GHz频段重耕, 5GSA覆盖, 测量报告, 波束成形

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

中图分类号:

TN929.5

陆健贤, 黄济丘, 胡明星, 林衡华. 基于LTE测量报告的2.1 GHz和3.5 GHz 5G SA覆盖评估方法[J]. 电信科学, 2022, 38(6): 131-142.

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.

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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