TY - GEN
T1 - Achieving mURLLC Under Nakagami-m Fading in the CF mMIMO System
AU - Xu, Qingqin
AU - Li, Zhuoer
AU - Zhang, Biru
AU - Zeng, Jie
N1 - Publisher Copyright:
© ICST Institute for Computer Sciences, Social Informatics and Telecommunications Engineering 2024.
PY - 2024
Y1 - 2024
N2 - Massive ultra-reliable and low latency communications (mURLLC) is emerging as a new important and critical service category in the six generation (6G) mobile communications. However, it is extremely challenging to achieve mURLLC because it needs to fulfill three performance requirements simultaneously, i.e., reliability, latency, and large-scale access requirements. Existing related studies are few and almost all based on the ideal assumption of Rayleigh fading or orthogonal pilots. We considered cell-free massive multiple-input multiple-output (CF mMIMO) and linear precoding to achieve mURLLC under Nakagami-m fading. Firstly, we establish a channel state information (CSI) error model with pilot contamination and analyze statistical properties of estimates and errors for Nakagami-m fading channels. Secondly, in conjunction with maximum ratio transmission (MRT) precoding, we derive the signal-to-interference-plus-noise ratio (SINR) of the downlink of the CF mMIMO system under Nakagami-m fading, which is meaningful but never mentioned in the literature. Then, we calculate the error probability (EP) with the finite blocklength and reveal interaction relationships between different indicators. The simulation results indicate that under pilot contamination, imperfect CSI, and Nakagami-m fading, mURLLC can be achieved by optimizing system configurations.
AB - Massive ultra-reliable and low latency communications (mURLLC) is emerging as a new important and critical service category in the six generation (6G) mobile communications. However, it is extremely challenging to achieve mURLLC because it needs to fulfill three performance requirements simultaneously, i.e., reliability, latency, and large-scale access requirements. Existing related studies are few and almost all based on the ideal assumption of Rayleigh fading or orthogonal pilots. We considered cell-free massive multiple-input multiple-output (CF mMIMO) and linear precoding to achieve mURLLC under Nakagami-m fading. Firstly, we establish a channel state information (CSI) error model with pilot contamination and analyze statistical properties of estimates and errors for Nakagami-m fading channels. Secondly, in conjunction with maximum ratio transmission (MRT) precoding, we derive the signal-to-interference-plus-noise ratio (SINR) of the downlink of the CF mMIMO system under Nakagami-m fading, which is meaningful but never mentioned in the literature. Then, we calculate the error probability (EP) with the finite blocklength and reveal interaction relationships between different indicators. The simulation results indicate that under pilot contamination, imperfect CSI, and Nakagami-m fading, mURLLC can be achieved by optimizing system configurations.
KW - Cell-free massive multiple-input multiple-output (CF mMIMO)
KW - Downlink precoding
KW - Finite blocklength (FBL)
KW - Massive ultra-reliable and low latency communications (mURLLC)
KW - Nakagami-m fading
KW - Pilot sharing
UR - http://www.scopus.com/inward/record.url?scp=85201938738&partnerID=8YFLogxK
U2 - 10.1007/978-3-031-67162-3_20
DO - 10.1007/978-3-031-67162-3_20
M3 - Conference contribution
AN - SCOPUS:85201938738
SN - 9783031671616
T3 - Lecture Notes of the Institute for Computer Sciences, Social-Informatics and Telecommunications Engineering, LNICST
SP - 315
EP - 330
BT - Communications and Networking - 18th EAI International Conference, ChinaCom 2023, Proceedings
A2 - Gao, Feifei
A2 - Wu, Jun
A2 - Li, Yun
A2 - Gao, Honghao
A2 - Wang, Shangguang
PB - Springer Science and Business Media Deutschland GmbH
T2 - 18th EAI International Conference on Communications and Networking in China, ChinaCom 2023
Y2 - 18 November 2023 through 19 November 2023
ER -