NEC · 10.8.3

NEC proposes adopting conventional OFDM-based waveforms (CP-OFDM, DFT-S-OFDM) as the baseline sensing waveform, requiring balanced performance and forward compatibility with existing 3GPP communication frameworks. They propose studying OFDM-based longer cyclic prefix (CP) schemes to support long-range sensing (multi-kilometer coverage), noting that NCP and ECP fail to meet these requirements (e.g., NCP supports only ~703 m at 15 kHz SCS in FR1), and require the CP length design of sensing symbols to be associated with the number of sensing symbols within a slot. NEC prioritizes studying TDM-based multiplexing between sensing and communication resources over FDM and SDM approaches, citing independent signal generation and maximized resource efficiency, and proposes studying at least symbol-level allocation based on TDD pattern configuration. They propose the study scope include both Continuous Waveform (CW) and Pulse Waveform (PW) transmission schemes, and propose studying OTFS-based waveform transmission for high-mobility scenarios due to its delay-Doppler domain robustness. They further propose studying dynamic waveform switching between candidate waveforms adaptively based on application, mobility conditions, and sensing accuracy requirements.