Regional Navigation Broadcast Conversion for Personalized Voice Guidance

The patent implements periodic action by interrupting the navigation message broadcast at regular intervals (e.g., every 6 seconds) rather than continuous transmission. During the interruption period, the base station stops broadcasting navigation messages, allowing the channel to clear of fading interference. This periodic on-off broadcasting pattern reduces cumulative power consumption while maintaining service availability, as users can accumulate messages from multiple interrupted cycles to achieve the required 150 milliseconds of navigation data.

The patent applies periodic action by broadcasting at maximum power only during active transmission intervals and completely shutting down during interruption intervals. This allows the system to achieve extended coverage during broadcast periods without the continuous energy burden of high-power transmission. The intermittent high-power broadcasting achieves the same effective coverage as continuous low-power broadcasting but with significantly reduced total power consumption.

The patent implements periodic interruptions in message broadcasting to clear accumulated fading interference from the channel. By stopping transmission at regular intervals, the system allows multipath fading and interference to dissipate before resuming broadcast. This periodic clearing prevents interference accumulation while maintaining message availability, as users can collect messages from multiple broadcast cycles and the interference-free intervals improve signal quality.