UE-Assisted DMRS Port Multiplexing Pattern Selection

The patent implements dynamic selection of DMRS port multiplexing patterns based on measured frequency selectivity conditions. The system transitions from a fixed pattern to a dynamic adaptation mechanism where the UE measures frequency selectivity and signals back to the base station, which then selects the appropriate pattern (with or without CDM) according to current channel conditions, thereby maintaining accuracy while managing complexity through conditional logic.

The patent changes the parameter of CDM application dynamically based on frequency selectivity measurements. When frequency selectivity is low, CDM is applied to increase throughput by multiplexing multiple DMRS ports in the code domain. When frequency selectivity is high, CDM is avoided to maintain estimation reliability. This parameter change is controlled by comparing measured frequency selectivity against thresholds and selecting corresponding multiplexing patterns.

The patent extracts only the essential information needed for pattern selection rather than transmitting complete frequency selectivity measurements. The UE measures frequency selectivity and extracts the key decision parameter (whether it exceeds a threshold) to signal a preferred pattern or measurement result to the base station. This extraction approach provides sufficient information for optimal selection while minimizing signaling overhead by transmitting only the critical decision-relevant data.