NB-IoT NPRACH Carrier Resource Selection

The patent implements dynamic carrier resource selection where NB-IoT devices adapt their carrier choice based on measured coverage levels and RSRP values. The device determines coverage level dynamically and selects from multiple carrier types (anchor or non-anchor carriers) based on current conditions, transforming a static selection process into a dynamic one that responds to changing channel conditions, thereby improving communication reliability without significantly increasing device complexity

The patent changes the parameter of carrier selection by introducing probability values and RSRP thresholds that vary based on coverage level. Instead of using a fixed carrier, the device adjusts selection parameters (carrier type, probability of selection) according to measured signal strength and coverage level, enabling adaptation to different propagation conditions while maintaining manageable device complexity through standardized procedures

The patent segments the carrier resources into distinct types (anchor carriers and non-anchor carriers) with different characteristics and suitability for different coverage levels. This segmentation allows the device to adapt to varying coverage conditions by selecting appropriate carrier types without requiring complex continuous optimization, as the discrete segments provide clear selection criteria based on coverage level and RSRP measurements

The NB-IoT device performs self-service by autonomously determining its coverage level based on RSRP measurements and independently selecting appropriate carrier resources without requiring complex network coordination. The device uses predefined thresholds and probability values to make adaptive selections, enabling versatility in coverage adaptation while keeping device complexity manageable through self-contained decision logic