Spreadtrum · 10.6.2

Uplink WUS and operation · RAN1#124bis · Source verification

the AI's delta shifted vs RAN1#124

Spreadtrum softened their prior position of delaying on-demand SIB1 and idle-state on-demand SSB discussions by now proposing to study on-demand SIB1 in DS#1b/DS#2b and on-demand SSB/SIB1 in DS#2a, albeit with a new condition of good inter-carrier synchronization for DS#2a. They dropped the specific 5G NR legacy mechanism enumeration (RAR MAC PDU subheader with RAPID, Msg3 carrying system information request, RRC signaling) in favor of a shorter reference to PRACH as the starting point for unified design. The on-demand SSB for SCell proposal shifted from citing Rel-19 to citing Rel-17, both maintaining NW-triggered, no-UL-WUS operation. A new proposal to merge DS#2c into DS#1c was added. The earlier reference to successful 5G commercialization is absent. Multi-TRP UL WUS delay is a new item.

    AI-synthesized from contributions · all text is paraphrased
  

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Contributions at RAN1#124bis · 1 doc

R1-2601822 discussion not treated 3gpp.org ↗

Discussion on uplink WUS and operation

      Position extracted by AI
    

Spreadtrum/UNISOC proposes studying UL WUS for on-demand SIB1 in DS#1b and DS#2b, on-demand SIBx in DS#1c, and on-demand SSB/SIB1 in DS#2a under the assumption of good inter-carrier synchronization. They argue DS#1a is infeasible due to lack of UE discovery and measurement signals, and DS#2c should be merged into DS#1c as it is not a valid separate multi-cell scenario. They support a unified UL WUS design with PRACH as the starting point for its robustness against CTO/CFO and coverage. They suggest importing the Rel-17 on-demand SSB for SCell (NW-triggered, no UL WUS) into 6G Day 1, and delay multi-TRP UL WUS discussion.

      Summary
    

Spreadtrum/UNISOC presents 9 proposals and 2 observations discussing UL WUS for 6G on-demand SI/SSB triggering. The document analyzes necessity and feasibility per deployment scenario, advocating study of UL WUS for SIB1/SIBx/SSB in specific cases, and proposes PRACH as a unified design starting point.

Prior contributions at RAN1#124 · 1 doc · Feb 09, 2026

R1-2600127 discussion not treated 3gpp.org ↗

Discussion on uplink WUS and operation for 6GR

      Position extracted by AI
    

Spreadtrum proposes a single unified design for UL WUS to meet different on-demand signal requirements in 6G. They require on-demand SIBx to be supported from 6G Day 1 using 5G NR legacy mechanisms (PRACH with dedicated preambles/resources for UL WUS, RAR MAC PDU subheader with RAPID for NW acknowledgement, Msg3 carrying system information request, or RRC signaling for connected UEs), citing successful 5G commercialization and limited negative UE impact. They propose delaying UL WUS discussion for on-demand SIB1 and on-demand SSB in idle state until feasibility and necessity are evaluated in AI 10.5.1.1, referencing the FL guidance from R1-2509594. They support immediate adoption of on-demand SSB for SCell with NW triggering (no UL WUS) using the Rel-19 legacy solution, characterizing it as a good balance between NW energy efficiency and UE performance for synchronization and measurement purposes.

      Summary
    

This Spreadtrum contribution provides views on uplink wake-up signal (UL WUS) design and on-demand system information/SSB operation for 6G, containing 5 proposals and 5 observations. It supports a unified UL WUS design and proposes immediate adoption of on-demand SIBx and on-demand SSB for SCell from 5G NR legacy, while recommending delayed discussion on UL WUS for on-demand SIB1 and SSB in idle mode pending progress in other agenda items.

    How this was derived
  

The AI extracted the "position extracted" field above directly from each Tdoc during summarization. For the delta summary at the top, the AI compared Spreadtrum's consolidated stance at RAN1#124bis against their stance at RAN1#124 and classified the change as shifted. Always verify critical claims against the original Tdocs linked above.