Base Station UE Positioning Using CSI Beamforming and Kalman Filtering

The patent replaces the GPS-based positioning mechanism with a base station-based channel state information measurement mechanism. Instead of relying on GPS satellites and external positioning results, the system uses the base station's received pilot signals and channel state information to directly calculate UE position, thereby eliminating the time delay and position deviation issues inherent in GPS-based approaches.

The patent introduces channel state information (CSI) as an intermediary to transfer positioning information. Rather than directly using GPS coordinates, the system uses CSI measurements from pilot signals as an intermediate representation that contains embedded position information, which can be extracted and processed to determine accurate UE location without the timing issues of GPS transmission.

The patent applies Kalman filtering as a preliminary processing step to the channel state information before position calculation. By pre-processing the CSI data with Kalman filtering to remove noise and enhance signal quality, the system improves positioning accuracy while keeping the subsequent position calculation relatively simple, as the difficult filtering work has already been done in advance.

The patent implements directional beamforming with feedback mechanisms where the base station adjusts beam directions based on received pilot signals and channel state information. This feedback loop allows the system to iteratively improve positioning accuracy by refining beam directions and focusing measurement energy on the UE's actual location, thereby achieving high precision without requiring overly complex processing throughout the entire system.