Uplink control channel for 5G new RAT

Abstract

In this paper, designs for the New Radio (NR) physical uplink control channel (NR PUCCH) spanning 1 orthogonal frequency division multiplexing (OFDM) symbol duration (short-PUCCH) is investigated. Two short-PUCCH formats i.e., Format A, in which demodulation reference signal (DMRS) and uplink control information (UCI) are FDMed, and Format B, in which DMRS and UCI are TDMed, are proposed and evaluated by computer simulation. For Format A, various DMRS overheads can be realized by adjusting the numbers of DMRS subcarriers and that of UCI subcarriers for the given 1 OFDM symbol. For Format B, we assume no FDM between DMRS and UCI, so that discrete Fourier transform (DFT)-spread OFDM (DFT-s-OFDM) waveform is applicable; in order to adjust DMRS overhead, we locate more than one OFDM symbols within the given 1 OFDM symbol duration by using higher subcarrier spacing (SCS) for the short-PUCCH with Format B. The link-level evaluation results and link-budget analysis show that Format A offers better link-level performance than Format B, while better link-budget performance is achieved by Format B, with taking into account the peak-to-average power ratio (PAPR) power back-off margin.