Nokia · 10.5.2.1
Downlink transmission scheme(s) for downlink control channels ·
RAN1#124bis · Source verification
the AI's delta
strengthened
vs RAN1#124
Nokia hardened its position on two UE monitoring capabilities: flexible CORESET placement within a slot tightened to flexible CORESET placement beyond the first 3 symbols,' and the previously general Day-1 mandatory proposal now explicitly requires support for more than one CORESET in addition to CORESET#0.' A new proposal added: baseline blind decoding limits from 5G could be increased given evolved UE processing capabilities, extending the earlier review of DCI-size/CCE limits. The configurable scrambling ID for MU-MIMO is a new specificity added to the DM-RS design. Dropped entirely: the power-saving proposals on baselining C-DRX and prioritizing SSSG switching over PDCCH skipping, the study of non-interleaved CCE-to-REG mapping for CORESET0 above 5MHz, the increase of maximum configured search spaces, and the separation of paired DCI formats across different search spaces.
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Contributions at RAN1#124bis · 1 doc
On downlink transmission schemes for downlink control channels in 6GR
Position extracted by AI
Nokia proposes reusing NR's PDCCH structure (CORESET, CCE, REG, search spaces) as the baseline for 6GR, arguing this provides sufficient flexibility and enables smooth MRSS with 5G through aligned PDSCH rate matching and per-CCE CORESET/SS sharing. They require QPSK modulation and transparent DM-RS based precoding with configurable scrambling ID for MU-MIMO, and propose studying DM-RS design changes to maximize coexistence between CORESET#0 and dedicated CORESETs. Nokia proposes enhanced UE monitoring as mandatory Day-1 features, including flexible CORESET placement beyond the first 3 symbols and support for more than one CORESET in addition to CORESET#0. They also propose simplifications to the 5G monitoring capabilities framework by reviewing whether limits on maximum DCI sizes and CCEs are still needed, and suggest that baseline blind decoding limits from 5G could be increased given evolved UE processing capabilities.
Summary
Nokia presents 23 proposals and 5 observations on the 6GR downlink control channel (PDCCH) design, advocating for reusing and evolving the NR PDCCH framework—including CORESET, CCE, REG, search spaces, blind decoding, and DMRS—as the baseline for 6G, with targeted enhancements for MRSS, UE monitoring flexibility, and reduced complexity.
Prior contributions at RAN1#124 · 1 doc · Feb 09, 2026
On downlink transmission schemes for downlink control channels in 6GR
Position extracted by AI
Nokia proposes retaining the baseline 5G NR PDCCH structure—including CORESET, CCE, REG, blind decoding, search spaces, aggregation levels, and QPSK modulation with transparent DM-RS-based precoding—for 6GR, arguing this flexibility is sufficient for 6G services and essential for smooth MRSS operation. They propose studying extensions such as non-interleaved CCE-to-REG mapping for CORESET0 above 5MHz and DM-RS design changes to maximize coexistence between CORESET#0 and dedicated CORESETs. Nokia proposes increasing the maximum number of configured search spaces and allowing separation of paired DCI formats for PDSCH/PUSCH scheduling across different search spaces to reduce monitoring burden. They propose that 6G Day-1 mandatory UE capabilities include flexible CORESET placement within a slot and support for more than one CORESET, while also proposing simplifications to the PDCCH monitoring capabilities framework by reviewing the need for limits on the maximum number of DCI sizes and CCEs. For power saving, Nokia proposes baselining C-DRX and prioritizing SSSG switching over PDCCH skipping due to its wider adaptation variety.
Summary
This document contains 7 observations and 16 proposals on downlink control channel design for 6G Radio (6GR). Nokia's overall position is that the 5G NR PDCCH structure (CORESET, CCE, REG, blind decoding, search spaces, aggregation levels, QPSK with DM-RS) is sufficiently flexible and should be retained as the baseline for 6GR, with targeted enhancements for Multi‑Radio Spectrum Sharing (MRSS), complexity reduction, and UE power saving.
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
strengthened.
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