TCL · 10.5.2.3
Uplink transmission scheme(s) for uplink channels ·
RAN1#124bis · Source verification
the AI's delta
new
vs RAN1#124
TCL is a new contributor at RAN1_124bis. Their PUCCH simplification stance aligns with Spreadtrum's prior proposal to limit formats from five to fewer, citing UCI multiplexing difficulty, resource configuration overhead, and implementation complexity. Their DMRS proposal is distinctive in three ways: it introduces the concept of a new flexible and extensible DMRS mapping type differing from Type 1 or Type 2' rather than adopting an NR baseline, it proposes dynamic sparsity adjustment based on channel conditions for sparse DMRS, and it specifies one low PAPR sequence type as sufficient for DFT-s-OFDM DMRS. They introduce multi-TRP requirements absent from others: PUCCH repetitions to up to two TRPs as baseline and single-scheduling-trigger dual PUSCH to different TRPs. Their frequency-selective precoding rationale is tied to addressing precoding mismatch in frequency-selective channels, and a unified precoding structure is proposed to cover up to 8Tx FWA terminals.
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Contributions at RAN1#124bis · 1 doc
Transmission schemes for 6GR UL channels
Position extracted by AI
TCL observes that the five PUCCH formats in 5G significantly increase UCI multiplexing difficulty, resource configuration overhead, and implementation complexity, and proposes limiting the number of PUCCH formats in 6G. For PUSCH DMRS, TCL proposes studying support for up to 48 antenna ports, a new flexible and extensible DMRS mapping type differing from Type 1 or Type 2, and time-domain/frequency-domain sparse DMRS mapping with dynamic sparsity adjustment based on channel conditions. TCL supports both CP-OFDM and DFT-s-OFDM waveforms as baseline for 6G PUSCH and suggests one low PAPR sequence type is sufficient for DFT-s-OFDM DMRS, with Type 2 refinement or a new design. For uplink transmission schemes, TCL requires PUCCH repetitions to up to two TRPs as a baseline and single-scheduling-trigger dual PUSCH for different TRPs to be supported. For uplink precoding, TCL proposes frequency-selective precoding to address precoding mismatch in frequency-selective channels and requires a unified precoding structure applicable across diverse terminal types including FWA terminals with up to 8Tx configurations.
Summary
TCL presents 1 observation and 11 proposals for 6GR uplink channel design, covering PUCCH format simplification, PUSCH/PUCCH DMRS enhancements, uplink transmission schemes with multi-TRP support, and uplink precoding design for CSI acquisition.
Prior contributions
TCL 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 TCL's consolidated stance at RAN1#124bis
against their stance at RAN1#124 and classified the change as
new.
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