R1-2600157
discussion
Design of WUS with OFDM based sequence
From Huawei
Summary
This document contains 8 observations and 10 proposals discussing the design of an OFDM-based DL WUS (Wake-Up Signal) for 6G, focusing on requirements like capacity, detection complexity, and coverage, as well as specific signal design aspects including waveform, sequence type, bandwidth, and evaluation methodology.
Position
Huawei proposes that DFT-s-OFDM is supported for DL WUS design to enable time domain detection without FFT, reducing receiver power consumption compared to CP-OFDM. They argue that ZC sequence properties (equivalence between time and frequency offset) allow detection without exhaustive frequency offset scanning, proposing ZC sequence as the evaluation baseline. They question whether ZC sequence capacity is sufficient for UE-dedicated or finer granularity wakeup, proposing to study other sequence types that can support larger capacity with less resource overhead. They propose studying appropriate bandwidth for DL WUS by jointly considering coverage performance, power consumption, and resource overhead. They propose reusing the low power radio architecture for OFDMA-based signals/channels studied in NR for 6G DL WUS study.
Key proposals
- Proposal 1 (Sec 2.3): In 6G, the design of DL WUS with OFDM based sequence needs to consider larger capacity compared with 5G-A.
- Proposal 2 (Sec 2.3): In 6G, the design of DL WUS with OFDM based sequence needs to consider low complexity/power consumption for detecting WUS sequences.
- Proposal 3 (Sec 2.3): In 6G, the design of DL WUS with OFDM based sequence needs to consider better coverage performance compared with 5G-A.
- Proposal 4 (Sec 2.3): DFT-s-OFDM is supported for DL WUS design.
- Proposal 5 (Sec 3.2): Study candidate sequence types for 6G DL WUS by considering at least capacity requirement, detection performance, and resource overhead.
- Proposal 6 (Sec 3.3): Study appropriate bandwidth for DL WUS considering at least coverage, power consumption, and resource overhead.
- Proposal 7 (Sec 3.4): Reuse low power radio architecture for OFDMA-based signals/channels studied in NR for 6G DL WUS study.
- Proposal 8 (Sec 4): ZC sequence is used as the baseline for evaluation comparison.
- Proposal 9 (Sec 4): The assumptions in Table 1 can be as the baseline for evaluation of different sequence types or signal designs.