Nokia · 10.5.3.2
Aspects of uplink-based CSI acquisition ·
RAN1#124bis · Source verification
the AI's delta
refined
vs RAN1#124
Nokia added proposals for TD-OCC upon SRS repetition targeting multiplexing capacity and PUSCH co-scheduling with UL SRS without impacting channel estimation—neither concept appeared in their prior position. Their DMRS-for-CSI argument added a new technical rationale: discrepancies in power and interference between SRS and PUSCH. Their streamlining scope expanded from DMRS-only to include unified SRS configurations across aperiodic/semi-persistent/periodic types and unified frequency hopping. Their earlier simulation results showing legacy codebooks deliver no notable performance improvement with Rel-19 directional UE antenna model and the associated new codebook design proposal for handheld devices are dropped. Their baseline reuse stance, FWA >8 ports study, and antenna-switching configurations are preserved.
AI-synthesized from contributions · all text is paraphrased
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Contributions at RAN1#124bis · 1 doc
On uplink-based CSI acquisition in 6GR
Position extracted by AI
Nokia proposes reusing the existing 5G UL SRS design framework, basic SRS resource definition, and Zadoff-Chu sequences as foundational building blocks for 6GR. They propose studying enhancements to TD-OCC upon SRS repetition for multiplexing capacity and co-scheduling of PUSCH with UL SRS without impacting channel estimation. For FWA devices specifically, they propose studying support for SRS APs greater than 8 and new antenna-switching configurations. They propose studying the use of DMRS associated with PUSCH transmissions as a complementary or alternative CSI acquisition mechanism to SRS, citing discrepancies in power and interference between SRS and PUSCH. They strive for streamlining through unified SRS configurations across aperiodic, semi-persistent, and periodic types, as well as unified frequency hopping.
Summary
This Nokia contribution (R1-2601840) presents 10 observations and 24 proposals focused on UL-based CSI acquisition for 6GR, emphasizing reuse of the 5G SRS design framework while identifying specific enhancements needed for capacity, coverage, latency, and new device types.
Prior contributions at RAN1#124 · 1 doc · Feb 09, 2026
On uplink-based CSI acquisition in 6GR
Position extracted by AI
Nokia proposes reusing the existing 5G NR UL SRS design framework, basic resource definition, and Zadoff-Chu sequences as the baseline for 6G, with SRS support up to 8 antenna ports for UEs. For Fixed Wireless Access (FWA) devices, Nokia proposes studying support for more than 8 SRS antenna ports and new antenna-switching configurations. They present system-level simulation results indicating legacy 5G codebooks deliver no notable performance improvement for fully coherent transmissions with the new Rel-19 directional UE antenna model, proposing studies for new codebook designs tailored to handheld devices and potential relaxation of power control to enable non-uniform transmit power allocation across UE antenna ports. Nokia argues that open-loop transmission schemes should remain specification-transparent and proposes studying the use of DMRS or other PUSCH-associated reference signals for UL CSI acquisition to reduce SRS overhead.
Summary
Nokia's R1-2600040 presents 30 proposals and 14 observations on uplink-based CSI acquisition for 6G, covering SRS design evolution, UL/DL CSI acquisition, and AI/ML for overhead reduction. The document argues for reusing the 5G NR SRS framework as a baseline while studying enhancements for higher antenna counts, new directional UE antenna models, and dynamic adaptation.
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 Nokia's consolidated stance at RAN1#124bis
against their stance at RAN1#124 and classified the change as
refined.
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