ZTE · 10.5.2.3
Uplink transmission scheme(s) for uplink channels ·
RAN1#124bis · Source verification
the AI's delta
new
vs RAN1#124
ZTE is a new contributor at RAN1_124bis. Their DMRS design is the most specific of any contributor: Comb-3 CDM groups with FD-OCC=4 as basic pattern, extending to Comb-6 across double-RB with TD-OCC=2 for up to 48 orthogonal ports. This contrasts with Nokia's comb-type baseline, OPPO's prior Type 2-like extension, and TCL's new mapping type proposal. Their codeword-to-layer mapping proposal addresses per-layer SINR disparity exceeding 6 dB observed in field tests and simulations under the Rel-19 handheld UT model, with three specific CW-mapping options. Their PUCCH simplification specifies explicit format boundaries (format A for 1-6 bits sequence-based, format B for larger payloads with comb-based DMRS). Their UL coverage enhancement proposal uniquely includes a mandatory UE transmit power increase to 26 dBm or more. They explicitly deprioritize SIP and postpone DMRS-free studies until channel modulation outcomes are reached.
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Contributions at RAN1#124bis · 1 doc
Discussion on uplink transmission scheme(s) for uplink channels
Position extracted by AI
ZTE proposes prioritizing uplink coverage enhancement for 6G at around 7 GHz through coherent transmission, advanced UL codebook design including high-resolution and frequency-selective codebooks, and mandatory increased UE transmit power of 26 dBm or more. They propose studying flexible codeword-to-layer mapping with three options (CW per layer, single CW with individual modulation order, two CWs with {1,1}/{1,2}/{2,2} mappings) to address observed per-layer SINR disparity exceeding 6 dB in field tests and simulations under the Rel-19 handheld UT model. They require a unified and streamlined DMRS design with Comb-3 CDM groups and FD-OCC=4 as the basic pattern, extending to Comb-6 across double-RB with TD-OCC=2 for up to 48 orthogonal ports, while proposing to deprioritize SIP and postpone DMRS-free studies until channel modulation outcomes are reached. ZTE proposes PUCCH simplification to two formats (sequence-based format A for 1-6 bits, format B for larger payloads with comb-based DMRS), and requires support for asymmetric DL sTRP/UL mTRP decoupling from day 1 with multi-TRP operation from initial access.
Summary
This ZTE contribution on 6G uplink design contains 35 proposals and 8 observations, addressing enhancements to PUSCH, PUCCH, DMRS, and multi-TRP operation. The document prioritizes coverage enhancement, coherent transmission, flexible codeword-to-layer mapping, high-resolution codebooks, unified DMRS patterns based on Comb-3 with FD-OCC=4, and supports asymmetric DL/UL TRP decoupling from 6G day 1.
Prior contributions
ZTE 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 ZTE's consolidated stance at RAN1#124bis
against their stance at RAN1#124 and classified the change as
new.
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