Partial Frequency Sounding Pattern Signaling for 5G Positioning

The frequency sounding process is segmented into partial frequency patterns (PFS) where only specific frequency subsets are sounded instead of the entire frequency range. The location server configures multiple PFS patterns with different frequency subsets, and the UE alternates between them, achieving both positioning accuracy and spectral efficiency by sounding only necessary frequency portions at any given time.

The location server acts as an intermediary that manages and coordinates multiple PFS patterns. It configures the patterns, determines which patterns to activate, and controls the timing of pattern alternation. This external coordination mechanism allows the system to support multiple complex patterns without increasing UE complexity, as the UE simply follows the location server's instructions for pattern selection and timing.

The system implements periodic alternation between different PFS patterns at configured time intervals. The UE switches between patterns in a periodic manner controlled by timing parameters (e.g., patternPeriodicity, patternOffset) provided by the location server. This periodic structure allows frequent sounding measurements to maintain positioning accuracy while the structured timing reduces random signaling overhead and associated latency.