FUTUREWEI · 10.6.2

Futurewei frames UL WUS primarily as an operational enabler for on-demand SS/PBCH/SIB1 rather than a standalone waveform design topic. They propose prioritizing the study of on-demand SIB1 using UL WUS in DS#1b and DS#2, and studying SIB1 time adaptation in DS#1c and DS#2c. They question the practical utility of DS#1a and propose RAN1 discuss whether it should be supported at all, deeming DS#1b/1c and DS#2 as the practical priority. For standalone deployment scenarios, they propose studying UL WUS configuration acquisition via light synchronization signaling with sequence-based structure that can indicate a predefined UL WUS configuration index, while also studying beam/index identification in the UL WUS request to allow the BS to limit on-demand response to a subset of beams.

Futurewei proposes maximizing 6G network energy saving by supporting UL WUS in any RRC state and in standalone cells/carriers, removing the 5G NR constraints that limited on-demand SSB to SCell operation and on-demand SIB1 to cells with an assisting Cell A. They recommend adopting Rel-19 UL-WUS non-standalone operation as a baseline when a supporting cell is available, and propose a new light Sync Signal design with sequence-based structure to indicate UL WUS configuration, beam/Sync Signal index, and LSBs of SFN. They argue that preconfigured UL WUS configuration limits network flexibility in Sync Signal placement, and that MIB-based configuration fails to reduce initial access latency under long Sync Signal periodicity. They further propose UL WUS occasion definitions that account for coarse UE timing synchronization and support both window-based (for long preambles) and one-to-one association (for short preambles) depending on timing information availability.