5G网络SSB 1+X波束技术应用研究

doi:10.11959/j.issn.1000-0801.2022012

Abstract

Abstract:

Beam scanning and spatial dimensions in 5G was introduced in the 3GPP standard.When UE connects gNodeB, gNodeB uses SSB beam rotation to detect the optimal beam of UE.After UE was connected, the CSI-RS configuration information could be obtained and the CSI could be normal feedback，gNodeB adopted the optimal beam transmitted by the CSI-RS beam in turn.5G antennas flexibly configure the number of beams and take into account coverage in both horizontal and vertical dimensions.The development of broadcast beams and the horizontal 7 beams facing challenges were presented, the horizontal 7 beam and 1+X beam schemes were analyzed.Finally, efficiency was presented.

Key words: 5G, beam scanning, SSB, CSI-RS, 7 beam, 1+X beam

CLC Number:

TP393

Bei LI, Yuhua HU, Xinyan WANG, Guoping XU, Guanghai LIU, Tian XIAO, Chen CHENG, Yi LI. Research on SSB 1+X beam technology of 5G network[J]. Telecommunications Science, 2022, 38(1): 150-158.

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References 5

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项目	取值
NR频率	3 400～3 600 MHz
NR带宽/发射功率	100 MHz/200 W
NR帧结构/特殊子帧配比	2.5 ms双周期/10:2:2
PRACH格式	长格式 Format 0 必选；短格式Format B4或C2必选
PRACH/PBCH周期	10 ms/20 ms
PUCCH格式	Format 0/Format 1 选一种同时Format 2/Format 3选一种
SSB子载波间隔/PDCCH符号数	30 kHz/1个
SSB波束数量	1；7
CSI-RS配置	8Port4Beam
天线通道数	64T64R
上行功率控制/AMC	启用

	SSB单束boosting 6dB+模3错开开销计算	7波束开销计算
总体开销	PDSCH RB Num=[273 RB×(7×1 s/2.5 ms/2)-(13 RB+20 RB+60 RB)×(1 s/20 ms)	PDSCH RB Num=[273 RB×(1 s/2.5 ms×7)-(20 RB+12 RB+1 RB)×4 slot×(1 s/20 ms)
	-18 RB×(1 s/40 ms)-30×(1 s/20 ms)-20 RB×50]/(7×1 s/2.5 ms/2)≈2.01%	-(18 RB×5+28 RB×2)×(1 s/40 ms)-30 RB×7波束× (1 s/20 ms)]/(7×1 s/2.5 ms/2)≈258
	开销≈1-（267.5/273）≈2.01%	开销≈1-（258/273）≈5.49%
接入资源开销	273 RB-[273 RB×（7×1 s/2.5 ms/2）-(13 RB+20 RB+60 RB)×(1 s/20 ms)	273 RB-[273 RB×（1 s/2.5 ms×7）-(20 RB+12 RB+1 RB)×4 slot×(1 s/20 ms)
	-18 RB×(1 s/40 ms)-30×(1 s/20 ms)]-20 RB×50]/(7×1 s/2.5 ms/2)≈5.5	-(18 RB×5+28 RB×2)×(1 s/40 ms)-30 RB×7波束（1 s/20 ms）]/(7×1 s/2.5 ms/2)≈15
	开销≈5.5/48≈11.46%	开销≈15/48≈31.25%

配置	SSB波束数	单个SSB符号数/个	SSB周期/slot	SIB符号数	SIB周期/slot	CSIRS符号数/个	CSIRS周期/slot	TRS符号数/个	TRS周期/slot	Paging符号数/个	Paging周期/slot	基准周期/slot	基准周期的下行符号数/个	占空比
2.5 ms双周期	7	4	40	14	80	4	40	4	40	14	20	40	360	78.06%
2.5 ms双周期	1+3	4	40	14	80	4	40	4	40	14	20	40	360	45.56%

波束配置	点位	RSRP/dBm	SINR/dB	误块率	调制与编码策略	下行平均速率/(Mbit·s^-1)	调度次数/次	信道质量指示
7	拉网均值	-85.09	23.88	7.91%	21.95	670.59	1 394.6	12.01
1+3	拉网均值	-85.95	22.39	7.96%	21.93	663.18	1 393.7	12.15

波束配置	点位	RSRP/dBm	SINR/dB	误块率	调制与编码策略	下行平均速率/(Mbit·s^-1)	调度次数/次	信道质量指示
7	拉网均值	-86.23	19.43	9.44%	18.78	500.12	1 339.7	12.27
1+3	拉网均值	-85.21	22.53	9.4%	19.11	476.59	1 331.7	12.07

Research on SSB 1+X beam technology of 5G network

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