4G载波向5G重耕之前的5G业务覆盖能力研究

doi:10.11959/j.issn.1000-0801.2023044

Abstract

Abstract:

In order to build a low-cost and high-efficiency 5G low-frequency network, it is necessary to study the best plan of plowing low-frequency 3G and 4G networks into 5G in advance.Under the condition of no ideal low frequency 5G test environment due to no re-farming, the coverage capacity after re-farming was estimated through theoretical analysis and was indirectly verified based on the current network test data.The key setting of link budget and model selection were discussed, the rationality of the estimation results was indirectly verified by the actual test data.The conclusion had been actually applied to the planning scheme of a major operator for the national 900 MHz network, which has essential reference significance to guide the network refarming.

Key words: 5G, low frequency, re-farming, coverage ability, indirect verification

Guanghai LIU, Tian XIAO, Bei LI, Xinzhou CHENG, Yongbei XUE, Yi LI, Xiaomeng ZHU, Yuting ZHENG. Research on 5G service coverage capability before 4G carrier re-farming to 5G[J]. Telecommunications Science, 2023, 39(3): 115-123.

Figures/Tables 10

References 12

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协议层/子层	字段长度
协议层/子层	未使用RoHC技术	使用RoHC技术
语音业务/20 ms	23.85 kbit/s→488 bit/s	23.85 kbit/s→488 bit/s
实时传输协议（real-time transport protocol，RTP）头	12 byte	40 bit
用户数据报协议（user datagram protocol，UDP）头	8 byte
网际互连协议（internet protocol，IP）头（IPv4/IPv6）	20 byte /40 byte
分组数据汇聚协议（packet data convergence protocol，PDCP）序列号	12 byte	12 byte
非确认模式的无线电链路控制（radio link control，RLC）	2 byte	2 byte
媒体访问控制（media access control，MAC）子层	3 byte	3 byte
MAC头（PHR+BSR）	48 bit	48 bit
包长度/20 ms（IPv4）（一般/最大）	864 bit/912 bit	584 bit/632 bit
包长度/20 ms（IPv6）（一般/最大）	1 024 bit/1 072 bit

覆盖场景		乡村	乡村	乡村	乡村
覆盖水平		1 Mbit/s@95%	3 Mbit/s@90%	1 Mbit/s@95%	3 Mbit/s@90%
基站类型		L900 2T2R	L900 2T2R	NR900 4T4R	NR900 4T4R
链路预算信道		上行PUSCH	上行PUSCH	上行PUSCH	上行PUSCH
用户感知速率	Mbit/s	1	3	1	3
载波频率	GHz	0.915	0.915	0.915	0.915
基站侧天线配置	#	2T2R	2T2R	4T4R	4T4R
终端侧天线配置	#	1T2R	1T2R	1T4R	1T4R
所需RB数	#	10	30	10	30
调制方式		QPSK 0.25	QPSK 0.25	QPSK 0.25	QPSK 0.25
Tx 等效全向辐射功率（equivalent	dBm	-0.79	-5.56	-0.79	-5.56
isotropic radiated power，EIRP）
热噪声功率谱密度	dBm/Hz	-132.24	-132.24	-132.24	-132.24
所需SINR	dB	0.24	0.24	-2.76	-2.76
基站接收机灵敏度	dBm	-129.20	-129.20	-132.20	-132.20
小区覆盖概率		95%	90%	95%	90%
边缘覆盖概率		87%	75%	87%	75%
阴影衰落余量	dB	9.0	5.4	9.0	5.4
切换增益/阴影衰落补偿	dB	3	3	3	3
最大可用传播损耗	dB	125.90	124.74	128.90	127.74

覆盖场景		乡村	乡村	乡村	乡村
覆盖水平		1 Mbit/s@95%	3 Mbit/s@90%	1 Mbit/s@95%	3 Mbit/s@90%
		（达到1 Mbit/s的	（达到3 Mbit/s的	（达到1 Mbit/s的	（达到3 Mbit/s的
		概率不低于95%）	概率不低于90%）	概率不低于95%）	概率不低于90%）
基站类型		L900 2T2R	L900 2T2R	NR900 4T4R	NR900 4T4R
最大可用传播损耗/dB		125.90	124.74	128.90	127.74
基准覆盖	Okumura-Hata	1 966	1 821	2 398	2 222
能力/m	3GPP RMa-NLOS	1 530	1 428	1 829	1 707
不同模型加权	50% : 50%	1 748	1 625	2 114	1 965
后的覆盖能力	60% : 40%	1 792	1 664	2 170	2 016
估算结果/m	80% : 20%	1 879	1 742	2 284	2 119
	…	…	…	…	…

系统带宽	系统类型	单用户		单小区
系统带宽	系统类型	下行峰值速率/（Mbit·s^-1）	上行峰值速率/（Mbit·s^-1）	下行峰值速率/（Mbit·s^-1）	上行峰值速率/（Mbit·s^-1）
10 MHz×2	2T2R	110.2	49.9	110.2	99.8
	2T4R	110.2	49.9	110.2	99.8
	4T4R	220.4	49.9	220.4	99.8
5 MHz×2	2T2R	52.6	20	52.6	40.1
	2T4R	52.6	20	52.6	40.1
	4T4R	105.2	20	105.2	40.1

覆盖场景	乡村	乡村
覆盖水平	1 Mbit/s@95%	3 Mbit/s@90%
基站类型	L900 2T2R	L900 2T2R
边缘信号强度	125.9	124.74
参考符号每RE功率/dBm	15.2	15.2
边缘信号强度RSRP/dBm	-112.7	-108
干扰余量补偿/dB	2	2
阴影衰落余量/dB	9	5.4
路测数据对照门限/dBm	-101.7	-100.6

Research on 5G service coverage capability before 4G carrier re-farming to 5G

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覆盖距离	试点1	试点2	试点3	试点4	试点5	多地加合	理论均值	理论范围
3 Mbit/s@90%对应覆盖距离/m	1 475	1 553	1 613	1 743	1 800	1 680	1 625	1 428～1 821
1 Mbit/s@95%对应覆盖距离/m	1 551	1 715	1 728	1 940	1 908	1 800	1 748	1 530～1 966

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