R1-2601920
discussion
Discussion on design of WUS with OFDM based sequence
From EURECOM
Summary
EURECOM proposes a Vertical-Horizontal Coding (VHC) product-code scheme for 6G Wake-Up Signal (WUS) design that separates frequency and time domain encoding to reduce receiver complexity. The document makes 2 Observations and 2 Proposals, demonstrating that the proposed VHC WUS design achieves 4dB gain at 1% BLER over the Rel-19 sequence-based design while enabling reduced-complexity non-coherent detection.
Position
EURECOM proposes a product-code based Vertical-Horizontal Coding (VHC) strategy where input bits are encoded independently in frequency-domain (vertical) and time-domain (horizontal), allowing the two components to be decoded independently to reduce receiver complexity. They propose studying increased payload capacity (>8 bits) for 6G WUS to enable enhanced grouping or UE-specific wake-up functionality. They present simulation results showing the proposed VHC scheme achieves approximately 4dB performance gain at 1% BLER compared to the Rel-19 sequence-based design under TDL-C 30ns channel with 15-bit payload over 11 PRBs. They also demonstrate that VHC can achieve similar performance to Rel-19 while consuming roughly 3 times fewer resources (168 REs vs 528 REs) at the expense of longer transmission time.
Key proposals
- Observation 1 (Sec 4.2): The proposed transmission scheme has low complexity because detection in time and frequency domain can be efficiently separated.
- Proposal 1 (Sec 5): Study the benefits of increased payload capacity for 6G WUS.
- Observation 2 (Sec 6): The proposed WUS transmission scheme significantly outperforms the WUS Rel-19 design.
- Proposal 2 (Sec 6): Study sequence-based WUS designs that allow for increased payload capacity.