Xiaomi opposes non-transparent FDSS-SE and FDSS in its RAN1 #126 proposal

RAN1 is the radio layer 1 working group, and both Xiaomi contributions concern the 6G radio (6GR) waveform. FDSS-SE is the waveform option in both proposals, while FDSS appears as an additional method in the later proposal. Xiaomi opened its RAN1 #125 proposal with "With the gain observed". The proposed study covered pi/2-BPSK (pi-over-two binary phase-shift keying) and QPSK (quadrature phase-shift keying). It also covered different receiver processing options and transparent or non-transparent processing at the transmitting side.

Source: R1-2603971, Xiaomi, 3GPP TSG RAN WG1 #125. © Xiaomi.

Xiaomi's Proposal 1 for RAN1 #126 says "Non-transparent FDSS-SE and FDSS is not supported". Our reading: Xiaomi moved from studying both processing options to opposing non-transparent FDSS-SE and FDSS. Transparent and non-transparent describe transmitter processing options here, while the two modulation formats were considered separately. If transparent FDSS-SE is supported, Xiaomi proposes studying how to suppress interference between user devices assigned overlapping resources. Our reading: That conditional study proposal does not establish support for transparent FDSS-SE.

Source: R1-2605559, Xiaomi, 3GPP TSG RAN WG1 #126. © Xiaomi.

Neither contribution was taken up at its meeting, and the register records no decision on either. These are Xiaomi proposals, not recorded agreements by the radio layer 1 working group.