TCL · 10.5.2.1
Downlink transmission scheme(s) for downlink control channels ·
RAN1#124bis · Source verification
the AI's delta
new
vs RAN1#124
TCL is a new contributor at RAN1_124bis. Brings several specific proposals not present in any prior meeting contributions: three coverage enhancement directions with quantified deployment targets (~7GHz, ~10dB additional path loss relative to 3.5GHz, narrowband 3-5MHz BWPs where NR aggregation limits are infeasible); larger CCE aggregation levels explicitly naming AL32 or higher; SFN-based M-TRP PDCCH mechanism for spatial diversity and reliability; a DMRS design baseline requirement specifying ZC sequence, single port, comb structure with 3 REs per REG; and a structured study of five distinct MRSS options (5G DTx-aware coordination, central multi-RAT node TDM/FDM sharing, unified SSB, common initial DL BWP, RAT-specific non-overlapping BWPs).
AI-synthesized from contributions · all text is paraphrased
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Contributions at RAN1#124bis · 1 doc
Downlink transmission schemes for downlink control channels
Position extracted by AI
TCL proposes preserving NR PDCCH flexibility through Search Space and CORESET concepts for 6G, with harmonized CCE and REG definitions across 5G and 6G to simplify multi-RAT spectrum sharing and PDSCH rate matching. They propose three specific coverage enhancement directions: flexible time domain repetition for PDCCH, larger CCE aggregation levels (e.g. AL32 or higher), and extending CORESET duration beyond the NR limit of three OFDM symbols—particularly targeting ~7GHz deployments with ~10dB additional path loss relative to 3.5GHz and narrowband 3-5MHz BWPs where NR aggregation limits are infeasible. TCL requires supporting the SFN-based M-TRP PDCCH mechanism for spatial diversity and reliability. They require 6G PDCCH DMRS design to use 5G NR as baseline (ZC sequence, single port, comb structure with 3 REs per REG), with any enhanced design needing sufficient justification. TCL proposes RAN1 study five MRSS options: 5G DTx-aware coordination, central multi-RAT node TDM/FDM sharing, unified SSB, common initial DL BWP, and RAT-specific non-overlapping BWPs.
Summary
This TCL contribution to 3GPP RAN1 #124bis contains 7 proposals and 2 observations on 6G PDCCH design. TCL advocates preserving NR PDCCH flexibility while proposing enhancements for coverage (repetition, higher aggregation, longer CORESET), supporting SFN-based M-TRP, reusing NR DMRS as baseline, and studying MRSS options between 5G and 6G.
Prior contributions
TCL has no prior contributions to 10.5.2.1 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 TCL's consolidated stance at RAN1#124bis
against their stance at RAN1#124 and classified the change as
new.
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