Nokia · 10.3.1
Channel coding ·
RAN1#124bis · Source verification
the AI's delta
strengthened
vs RAN1#124
Nokia hardened their LDPC design constraints by adding specific new limits not present at RAN1_124: max code block size locked at 8448, minimum code rate set to approximately 2/3, and a requirement to puncture only one column. They added a new technical argument against relying solely on reverse decoding order for BG1 evaluation comparisons, citing up to 0.65 dB degradation at high code rates, and advocate for near-optimal or top-down schedules instead — a decoder-scheduling dimension absent from their prior position. Their stance on small-payload block codes hardened from require identical to 5G to a specific technical justification citing optimized minimum distance and FHT-based ML decoding efficiency. The prior proposal for polar segment counts based on code rate/info length with SCL list size 8 or 16 is dropped from the current position. Boundary definition by max Rel-15 TBS per carrier is preserved.
AI-synthesized from contributions · all text is paraphrased
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Contributions at RAN1#124bis · 1 doc
On remaining aspects of channel coding in 6GR
Position extracted by AI
Nokia proposes defining the boundary between NR range and beyond-NR range for data rates using the maximum TBS supported in 5G NR Rel-15 per carrier. They propose reusing BG1 with an optimized puncturing pattern (e.g., puncturing columns 0 and 26 instead of the first two systematic columns) to achieve faster convergence at low maximum numbers of iterations, presenting simulation results showing 0.2-0.44 dB gain at MaxIts=5 and reduced average normalized iterations. For any new BG design, Nokia requires keeping the same dual-diagonal QC-LDPC structure as 5G, limiting max code block size to 8448, setting minimum code rate to approximately 2/3, using single-edge design, and puncturing only one column. They oppose relying solely on reverse decoding order for BG1 evaluation comparisons, arguing it causes up to 0.65 dB degradation at high code rates and advocating for near-optimal or top-down schedules instead. For control channels, Nokia questions the necessity of UCI and DCI payloads beyond NR range without further input from other agenda items, and proposes keeping NR RM block codes unchanged for small payloads given their optimized minimum distance and FHT-based ML decoding efficiency.
Summary
Nokia presents 8 proposals and 6 observations on 6G channel coding, covering LDPC extension for data channels, Polar codes for control channels, and block codes for small payloads. The document argues for reusing NR designs where possible, proposes specific design constraints if new base graphs are studied, and emphasizes the need for fair comparison methodologies, particularly regarding decoding schedules and complexity evaluation.
Prior contributions at RAN1#124 · 1 doc · Feb 09, 2026
On remaining aspects of channel coding in 6GR
Position extracted by AI
Nokia proposes defining the boundary between NR-range and beyond-NR-range data rates using the maximum TBS supported in 5G NR Rel-15 per carrier. For LDPC extensions beyond NR range, Nokia requires any new base graph to preserve the QC-LDPC dual-diagonal structure and sub-matrix construction from 5G, citing encoding efficiency advantages from avoiding matrix B inversion. Nokia presents technical evidence that reusing BG1 with an optimized puncturing pattern (puncturing columns 0 and 26 instead of the first two systematic columns) yields 0.2–0.44 dB gain at low MaxIts (e.g., 5 iterations) and reduces average normalized decoding iterations, positioning this as a candidate when reducing MaxIts is a design objective. For polar codes, Nokia questions the necessity of UCI payloads beyond NR range and proposes that any extension should design segment counts based on code rate and information length, with SCL decoding at list size 8 or 16 as the baseline receiver. Nokia requires block codes for small block lengths (≤11 bits) to remain identical to 5G, arguing minimal gain exists even under ML decoding.
Summary
This document presents Nokia's views on 6G channel coding, containing 6 proposals and 2 observations. It addresses LDPC extensions for data rates beyond NR range, polar code enhancements for control channels, and the retention of 5G block codes for small block lengths in 6G.
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.
Always verify critical claims against the original Tdocs linked above.