ZTE · 10.5.2.2
Downlink transmission scheme(s) for downlink shared channels ·
RAN1#124bis · Source verification
the AI's delta
new
vs RAN1#124
ZTE enters the discussion at RAN1_124bis with positions across multiple sub-areas. On multi-TRP, they propose that the 6GR downlink MIMO framework study prioritize multi-TRP operation from initial access, with CJT and sDCI-based mTRP prioritized for day 1 deployment to address coverage, UPT, and peak data rate. On DMRS, they propose a novel unified design based on Comb-3 CDM groups with FD-OCC length=4 per RB per symbol, supporting up to 48 orthogonal DMRS ports plus non-orthogonal DMRS via different sequences, and explicitly deprioritize interleaved VRB-to-PRB mapping over the entire bandwidth part. On CW-to-layer mapping, they propose studying three flexible options even for up to 4 layers, with particular emphasis on Option 2 (single CW with individual modulation order per layer) showing 36% SE gain — a distinct approach from both the NR baseline and other companies proposals. They present a technical case against AI-based receivers for DMRS-based channel estimation, arguing the performance gain is trivial (0.5-1.5 dB) and may be eliminated by AI/ML model flaws,' and deprioritize SIP study due to suboptimal performance compared to AI-based LD-DMRS with far higher computation complexity (31G vs 1.3G FLOPs).
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Contributions at RAN1#124bis · 1 doc
Discussion on downlink transmission scheme(s) for downlink shared channels
Position extracted by AI
ZTE proposes that 6GR downlink MIMO framework study focus on multi-TRP operation from initial access, with CJT and sDCI-based mTRP prioritized for day 1 deployment to address coverage, UPT, and peak data rate. They require a unified DMRS design based on Comb-3 CDM groups with FD-OCC length=4 per RB per symbol, supporting up to 48 orthogonal DMRS ports plus non-orthogonal DMRS via different sequences, and explicitly deprioritize interleaved VRB-to-PRB mapping over the entire bandwidth part. For codeword-to-layer mapping, they propose studying three flexible options even for up to 4 layers, with particular emphasis on Option 2 (single CW with individual modulation order per layer) showing 36% SE gain. They present technical case against AI-based receiver for DMRS-based channel estimation, arguing the performance gain is trivial (0.5-1.5 dB) and may be eliminated by AI/ML model flaws, and deprioritize SIP study due to suboptimal performance compared to AI-based LD-DMRS with far higher computation complexity (31G vs 1.3G FLOPs).
Summary
This ZTE contribution to 3GPP RAN1#124 bis contains 33 proposals and 29 observations covering the 6GR downlink shared channel framework. It argues for prioritizing multi-TRP operation, unified DMRS design with up to 48 orthogonal ports, flexible codeword-to-layer mapping, and deprioritizing AI-based receiver and SIP studies at the beginning of 6GR.
Prior contributions
ZTE has no prior contributions to 10.5.2.2 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 ZTE's consolidated stance at RAN1#124bis
against their stance at RAN1#124 and classified the change as
new.
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