Ambient IoT Multi-Point Positioning With Quantized Hybrid RX-TX Timing
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Solution Overview
Problem
Existing 3GPP technologies face challenges in supporting low-power, low-cost IoT devices with energy harvesting capabilities, particularly in terms of power consumption, device size, and cost, and lack a comprehensive system design for multi-point positioning of Ambient IoT devices.
Innovation Solution
An AIoT multi-point positioning method that calculates a hybrid RX-TX time difference (HRTTD) and encodes it as a quantized value (qHRTTD) in the device's reply, allowing for localization without synchronization to the network and minimizing reporting overhead.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If existing 3GPP technologies are used for positioning, then network synchronization is required, but device complexity and power consumption increase
Solution Approach 1:
The patent extracts the synchronization requirement from the positioning system, enabling AIoT devices to perform positioning without network synchronization. The device independently measures the reception time of activation signals and calculates the hybrid RX-TX time difference, eliminating the need for complex network synchronization mechanisms while maintaining positioning functionality.
Solution Approach 2:
The AIoT device performs self-positioning by autonomously measuring the reception time of activation signals and calculating the hybrid RX-TX time difference without requiring network synchronization support. The device uses its own internal timer and the measured time difference to determine its position, making the positioning system self-sufficient and reducing device complexity.
2Measurement precision
If network synchronization is implemented, then positioning can be achieved, but power consumption increases
Solution Approach 1:
The patent employs periodic action by using activation signals transmitted at specific intervals rather than continuous synchronization. The AIoT device measures the reception time of these periodic activation signals and calculates the hybrid RX-TX time difference, reducing power consumption compared to continuous network synchronization while maintaining positioning capability.
Solution Approach 2:
The AIoT device performs self-positioning by autonomously measuring the reception time of activation signals and calculating the hybrid RX-TX time difference without requiring network synchronization support. The device uses its own internal timer and the measured time difference to determine its position, making the positioning system self-sufficient and reducing device complexity.
3Loss of information
If explicit reporting is used, then positioning information can be transmitted, but reporting overhead increases
Solution Approach 1:
The patent extracts only the essential positioning information (the hybrid RX-TX time difference) from the full positioning data, transmitting it through the existing reply message without additional explicit reporting. This approach maintains positioning information completeness while minimizing reporting overhead by using only the necessary time difference calculation.
Solution Approach 2:
The hybrid RX-TX time difference acts as an intermediary parameter that encapsulates positioning information. Instead of transmitting raw positioning data or multiple synchronization parameters, the device calculates and transmits only this time difference value, which serves as a compact intermediary representation of positioning information, reducing reporting overhead.
Data Source
AI summary
An apparatus includes means for measuring a reception time of an activation signal that triggers a reply; means for determining a transmission time of the reply; and means for determining a reception transmission time difference as a difference between the transmission time of the reply and the reception time of the activation signal that triggers the reply.