Terminal Device PLMN Search Timer Configuration

The patent implements periodic PLMN searching with configurable intervals. Instead of continuous searching, the device performs searches at predetermined time intervals (e.g., every 5 minutes, 10 minutes), which reduces energy consumption while maintaining the ability to quickly reconnect to HPLMN when needed. The periodicity can be adjusted based on network conditions and device requirements.

The patent dynamically adjusts the PLMN search periodicity based on various factors including device mobility state, network conditions, and user preferences. When the device is stationary, a longer search interval is used to save energy. When mobility is detected, the interval is reduced to improve connection speed. This dynamic adaptation resolves the contradiction between energy saving and connection speed.

The patent segments the frequency band search into prioritized groups. Instead of searching all frequency bands simultaneously, the device first searches higher priority bands (e.g., bands more likely to have HPLMN coverage) and only proceeds to lower priority bands if necessary. This segmentation maintains search reliability for the most important networks while reducing overall complexity and energy consumption.

The patent applies partial searching by focusing on the most relevant frequency bands first. The device performs comprehensive searching only when absolutely necessary (e.g., when HPLMN is not found in primary bands), and uses limited scanning for less critical bands. This partial action approach maintains sufficient reliability while significantly reducing complexity and power consumption compared to exhaustive searching.

The patent implements preliminary configuration of timer intervals based on pre-established mobility patterns and network characteristics. Instead of frequently adjusting timers in real-time, the device uses pre-configured timer sets that are automatically selected based on detected mobility state. This preliminary preparation maintains adaptability while reducing the complexity of real-time timer management.

The patent enables the device to self-adjust timer intervals based on its own mobility detection without requiring complex external control. The device monitors its own movement state and automatically selects appropriate timer configurations, simplifying the overall system complexity while maintaining high adaptability to changing network conditions.