Spreadtrum · 10.5.0

Spreadtrum/UNISOC requires a 20MHz smallest maximum UE bandwidth (Alt 1) for lower-tier 6GR devices, arguing that 20MHz offers an optimal balance between complexity reduction (35-70%) and system performance compared to 5MHz. They propose Option 2 (double 200MHz RF with single 400MHz BB) as the preferred starting point for enabling UE support of 400MHz downlink CBW, balancing performance and implementation complexity over the more stringent Option 1 or CA-limited Option 3. The company introduces the 'Gothia cell' concept for aggregating multiple physical carriers into a single virtual cell to simplify cell management and reduce latency compared to traditional CA, and proposes studying three DCI scheduling options for cross-carrier data transmission within this cell. They oppose support for gNB dynamic SBFD, UE SBFD, and gNB full duplex in 6GR Day 1, citing unproven gains and interference challenges, but propose studying a native SBFD symbol type within the 6GR frame structure alongside reserved resources for forward compatibility. Additionally, they address NR-6GR MRSS by proposing a unified design with co-located TRPs as a baseline, aligned numerology and waveform, and a requirement for no impact on legacy NR UE behavior.

Spreadtrum proposes studying SBFD symbol as a new native symbol type in 6GR frame structure while opposing gNB dynamic SBFD, UE SBFD, and gNB full duplex in Release day1. They require separate discussion of NW-side and UE-side maximum CBW, and separate DL versus UL max CBW at UE side, supporting only Option 2 (dual 200MHz RF + single 400MHz BB) or Option 3 (dual 200MHz RF + dual 200MHz BB) for UE to achieve 400MHz around 7GHz. They propose studying Single Cell Multi-Carrier (SCMC) mechanism for non-contiguous intra-band carriers and DL/UL decoupling, while identifying NTN techniques applicable to TN in day1. They adopt 20MHz as the smallest maximum supported UE bandwidth for low-tier devices, closing high-level scalable design discussions, and require bottleneck channel identification across all RRC states to avoid piecemeal coverage enhancements.