5G NR Uplink Control Channel Coverage Enhancement Based on Sequence Segmented Detection with New Low-PAPR Sequences

Abstract

The fifth generation of wireless communication system (5G) will provide more diversified applications and higher-quality services for users with different needs. Compared with long term evolution (LTE), 5G uses a higher carrier frequency, which suffers from larger path loss and severely degrades the coverage of 5G. In practical application, due to the limited uplink transmit power of terminal, it's challenging to enhance the uplink coverage in 5G commercial process. Physical uplink control channel (PUCCH) is responsible for transmitting uplink control information (UCI). In order to enhance the coverage of the uplink, it is necessary to improve the transmission reliability of the uplink control channel under low signal-to-noise radio (SNR). This paper first analyzes the advantages of sequence-based PUCCH transmission in low SNR environment. On this basis, a new scheme for constructing lower peak-to-average-power ratio (PAPR) sequence pool is proposed. Compared with the Zadoff-Chu (ZC) sequence specified in 5G protocol, the generated sequence pool has lower PAPR characteristics, and combined with the sequence segmentation detection scheme will bring better block error rate (BLER) performance. The simulation results show that the proposed sequence segmentation detection scheme with new low-PAPR sequence pool has excellent gain effect compared with other PUCCH transmission schemes, which can greatly improve the coverage ability of PUCCH.