LTE Path Loss Signaling for Accurate Positioning

The patent introduces path loss information as an intermediary parameter that mediates between the varying transmit power (caused by cell range control) and the positioning accuracy requirement. By measuring and reporting path loss values from multiple base stations, the system compensates for transmit power variations, enabling accurate positioning despite dynamic power adjustments for energy saving and interference coordination.

The patent changes the measurement parameter from raw signal strength (which is directly affected by transmit power variations) to path loss (which represents the actual propagation conditions). This parameter transformation allows the positioning system to remain accurate even when base station transmit powers are dynamically adjusted through cell range control techniques.

The patent implements a feedback mechanism where user equipment continuously measures path loss to multiple base stations and reports these measurements to the network. This feedback loop enables the system to dynamically update cell area descriptions based on actual propagation conditions, maintaining reliability even when transmit power is varied for load balancing and capacity boosting operations.

The patent transforms cell area descriptions from static, pre-defined geographic boundaries to dynamic regions defined by path loss thresholds. This dynamic approach allows cell areas to automatically adapt to changing transmit power conditions, ensuring that service area boundaries remain accurate regardless of power variations used for load balancing and capacity management.

The patent creates a terrestrial copy of GPS positioning capabilities by using path loss measurements from cellular base stations to determine position. Instead of relying on satellite-based GPS, the system uses the cellular network infrastructure itself to provide positioning information through path loss analysis, achieving GPS-like accuracy without requiring GPS receivers or satellite signal processing.

The patent enables the cellular network to provide positioning services to itself. By using existing cellular infrastructure (base stations and user equipment) and measuring path loss between them, the system achieves accurate positioning without external assistance from GPS satellites or additional specialized positioning hardware, making the network self-sufficient for positioning requirements.