Further enhancement on NR demodulation performance
The present technical report documents the Phase I study outcome on inter-user interference suppression for NR MU-MIMO and techniques to cope with LTE CRS interference for NR UE, with the detailed objectives as follows:、
• MMSE-IRC receiver for suppressing intra-cell inter-user interference
- Phase I: Evaluate the performance under practical MU-MIMO interference profile for the candidate reference receiver.
∘ Identify practical MU-MIMO interference modelling methodology
∘ Reference receiver: MMSE-IRC receiver. Use the DMRS-based interference covariance estimation method as a starting point
∘ Prioritize slot-based transmission scenario
• Evaluate techniques to cope with CRS interference in scenarios with overlapping spectrum for LTE and NR
- Candidate reference receiver to enable neighboring cell CRS-IM
∘ The performance benefit of neighboring cell LTE CRS-IM over the existing rate matching solutions specified in Rel-15 and Rel-16 shall be evaluated.
∘ Feasibility of the considered solution regarding NR PDSCH processing timeline need to be checked.
∘ Priority will be given to solutions not having RAN1 specification impact.
- Synchronous network scenario is prioritized. As second priority, RAN4 could evaluate the feasibility and usefulness of the asynchronous network scenario and specify if feasible and useful.
- 15 kHz SCS for NR is prioritized. RAN4 should evaluate the feasibility and usefulness of 30 kHz SCS for scenarios with LTE and NR deployed in neighboring BSs/areas and specify if feasible and useful.