Kyocera Corporation · 10.5.2.3
Uplink transmission scheme(s) for uplink channels ·
RAN1#124bis · Source verification
the AI's delta
new
vs RAN1#124
Kyocera Corporation is a new contributor at RAN1_124bis with no prior position. They introduce a radical departure from NR's PUCCH-centric design by proposing complete elimination of permanent PUCCH configuration and persistent resource allocation, moving all UCI (HARQ feedback, CSI reporting, SR) to MAC CE on PUSCH. A two-tier SR mechanism is specified: CB-PUSCH-SR using contention-based PUSCH-like common resource pools with open-loop power control and rapid retry for synchronized UEs, and minimized 2-step PRACH-SR as fallback for unsynchronized UEs. The proposal includes explicit non-overlapping operating regimes and implicit SR acknowledgement via MsgB reception or uplink grant within a configured response window.
AI-synthesized from contributions · all text is paraphrased
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Contributions at RAN1#124bis · 1 doc
PUCCH-less 6GR
Position extracted by AI
Kyocera proposes a PUCCH-less uplink control architecture as a baseline study direction for 6GR, combining Option 2 (UCI carried on PUSCH) and Option 3 (other methods) to avoid permanent PUCCH configuration and persistent resource allocation. They propose that UCI (HARQ feedback, CSI reporting, and SR) be conveyed via MAC CE on PUSCH whenever uplink resources are available to the UE, unifying control with data and access signaling. For cases without scheduled uplink resources, they propose studying two SR-replacement mechanisms: CB-PUSCH-SR as the primary, low-latency mechanism for synchronized UEs using contention-based PUSCH-like common resource pools with open-loop power control and rapid retry, and minimized 2-step PRACH-SR as a robust fallback for unsynchronized or coverage-limited UEs using PRACH-based power control and preamble detection. They require that CB-PUSCH-SR and PRACH-SR operate in non-overlapping regimes based on uplink synchronization status, with implicit SR acknowledgement via MsgB reception or uplink grant within a configured response window.
Summary
Kyocera proposes a PUCCH-less uplink control architecture as a baseline for 6GR, where UCI (HARQ, CSI, SR) is conveyed via MAC CE on PUSCH when resources are available, and a minimized SR-replacement mechanism is used otherwise. Three proposals are made: adopting the PUCCH-less architecture, using PUSCH for UCI delivery, and studying CB-PUSCH-SR as the primary SR method for synchronized UEs with PRACH-SR as a fallback.
Prior contributions
Kyocera Corporation has no prior contributions to 10.5.2.3 in the meetings currently tracked. This is either a new contributor to this sub-topic or the earliest meeting in our history.
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 Kyocera Corporation's consolidated stance at RAN1#124bis
against their stance at RAN1#124 and classified the change as
new.
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