Indoor Positioning Signal Collision Prevention via Time Slot Synchronization
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Solution Overview
Problem
Conventional indoor positioning systems face signal transmission collisions between multiple mobile terminals, which degrade positioning precision, as they transmit positioning signals simultaneously without coordinated timing.
Innovation Solution
The system employs a wireless base station and mobile terminals with microprocessors and time counters, synchronizing time slots and preset transmission points for each terminal based on unique identity numbers, ensuring that each terminal transmits its positioning signal at a specific time within each time slot, preventing collisions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple mobile terminals simultaneously transmit positioning signals in a conventional indoor positioning system, then the positioning function can be provided for multiple terminals, but signal transmission collisions occur which decrease positioning precision
Solution Approach 1:
The patent implements periodic time slots for signal transmission, where each mobile terminal is allocated specific time windows within periodic cycles to transmit positioning signals. This periodic structure ensures that multiple terminals can transmit signals over time without collisions, while maintaining the positioning function for all terminals. The time counter increments through defined time slots, creating a periodic transmission pattern that resolves the contradiction between supporting multiple terminals and avoiding signal collisions.
2Device complexity
If multiple mobile terminals transmit positioning signals at the same time, then the positioning system can operate with simple timing, but signal transmission collisions occur between terminals
Solution Approach 1:
The patent applies preliminary action by pre-configuring time slot allocation and preset time points for each mobile terminal before signal transmission begins. The system establishes a timing structure in advance where each terminal knows its designated transmission window, eliminating the need for complex real-time coordination during signal transmission. This preliminary timing arrangement prevents signal collisions while keeping the operational complexity low.
Solution Approach 2:
The patent segments the time domain into distinct time slots and further divides each time slot into multiple preset time points. This segmentation approach allocates specific transmission opportunities to different mobile terminals, ensuring that signals from multiple terminals do not collide. The time counter increments through these segmented time units, providing a structured framework that prevents harmful signal interactions while maintaining simple operation.
Data Source
AI summary
An indoor positioning system and an indoor positioning method allow all of the wireless base stations and mobile terminals in the same interior space to synchronously generate their time slots. Further, each mobile terminal transmits a positioning signal only at a preset time point in each time slot to prevent collisions between mobile terminals transmitting the positioning signals.