Nokia · 10.5.2.3
Uplink transmission scheme(s) for uplink channels ·
RAN1#124bis · Source verification
the AI's delta
strengthened
vs RAN1#124
Nokia hardened their PUSCH baseline from open proposals to specifying SRS-based codebook-based PUSCH as the baseline with a unified precoding framework including per-port amplitude scaling and dynamic coherency conditions, while explicitly deprioritizing non-transparent open-loop and multi-TRP PUSCH schemes citing limited 5G adoption. Their MIMO layer imbalance mitigation was refined with quantified evidence: ~30% throughput gain from multi-codeword transmission with SIC receivers from rank 2, up from the prior meeting's qualitative identification of the problem. A new FDRA design constraint appeared: contiguous-only FDRA Type 1. The DMRS type description softened slightly from Rel-18 e-type 1 as baseline to comb-based pattern without the explicit NR release anchor. Their three-category sparse DMRS proposal for AI/ML was preserved but reframed around evaluation fairness rather than study category definitions.
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Contributions at RAN1#124bis · 1 doc
On transmission schemes for uplink channels in 6GR
Position extracted by AI
Nokia proposes a streamlined 6G uplink control channel design by limiting CSI reporting to PUSCH and using PUCCH slot-level UCI multiplexing to avoid NR's complex iterative UCI arbitration. For the data channel, Nokia proposes SRS-based codebook-based PUSCH as the baseline, with studies on a unified precoding framework supporting per-port amplitude scaling and dynamic coherency conditions, while deprioritizing non-transparent open-loop and multi-TRP PUSCH schemes due to limited 5G adoption and implementation complexity. Nokia provides evidence that multi-codeword transmission from rank 2 with SIC receivers can achieve up to ~30% throughput gain over single-codeword mapping under layer imbalance. The company requires a single DMRS type (comb-based pattern) supporting up to 48 orthogonal ports, proposes multi-slot PUSCH TDRA exceeding 14 symbols, and advocates for contiguous-only FDRA Type 1, while emphasizing the need for fairness in AI/ML receiver evaluations using sparse DMRS.
Summary
This 3GPP Tdoc from Nokia for the FS_6G_Radio work item provides a comprehensive analysis and set of 21 observations and 40+ proposals on uplink physical channel design for 6G Radio. It covers PUCCH simplification, PUSCH transmission schemes (codebook/non-codebook, full-power, multi-TRP), codeword-to-layer mapping for layer imbalance, DMRS design, resource allocation, power control, and AI/ML-based DMRS overhead reduction.
Prior contributions at RAN1#124 · 1 doc · Feb 09, 2026
On transmission schemes for uplink channels in 6GR
Position extracted by AI
Nokia proposes simplifying 6GR UCI arbitration by limiting CSI reporting to PUSCH only and adopting slot-level one-shot multiplexing/prioritization to eliminate the iterative symbol-level procedures of NR. They argue NR's five PUCCH formats are excessive and proposes a limited set of scalable PUCCH formats with high similarity to PUSCH design for larger UCI sizes. For PUSCH, Nokia identifies MIMO layer imbalance as a significant performance degradation factor and proposes studying multi-codeword operation and MCS table optimizations to decouple modulation order from code rate, along with new codeword-to-layer mapping to mitigate imbalance. They require a single unified DMRS type with a scalable comb-type pattern supporting up to 48 orthogonal antenna ports, using Rel-18 e-type 1 as baseline, and propose native multi-slot PUSCH resource allocations exceeding 14 symbols rather than NR's slot-bounded framework with later-release optional extensions. For AI/ML receivers, Nokia presents simulation evidence of throughput gains with sparse DMRS and proposes studying three categories of sparse DMRS patterns (time-domain, frequency-domain, and combined) within the unified 6G DMRS framework while emphasizing realistic aligned evaluation assumptions for both AI and legacy receivers.
Summary
This document from Nokia contains 23 Observations and 31 Proposals addressing uplink transmission schemes for 6GR, covering PUCCH simplification, PUSCH MIMO layer imbalance mitigation, DMRS design for up to 48 antenna ports, enhanced multi-slot resource allocation, and AI/ML receiver evaluation frameworks for sparse and DMRS-free operation.
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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