AMP Reference Signaling Across Multiple Frequencies for Precise Ranging
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional positioning methods for ambient power (AMP) devices, which are low complexity and low cost, fail to satisfy positioning or ranging requirements due to limitations in power consumption and cost, making it difficult to use large-bandwidth positioning reference signals for measuring time differences.
Innovation Solution
The AMP device transmits a reference signal on N candidate frequency-domain resources to determine its position or the distance to a receiver, utilizing phase characteristics such as phase differences across multiple frequencies for positioning or ranging.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional positioning methods are used for AMP devices, then device complexity and cost are reduced, but positioning precision and ranging accuracy are insufficient
Solution Approach 1:
The patent segments the frequency domain into multiple candidate frequency resources (N≥2) and transmits reference signals on these segmented resources. By dividing the frequency spectrum into multiple parts and using phase differences across these segments, the system achieves positioning precision without requiring a single large-bandwidth signal, thus avoiding increased device complexity.
Solution Approach 2:
The patent transitions from using a single frequency resource to utilizing multiple frequency-domain resources, adding a frequency diversity dimension. This dimensional expansion allows the system to achieve positioning accuracy through phase differences across multiple frequencies rather than requiring higher bandwidth in a single frequency, thereby maintaining low device complexity.
2Measurement precision
If large-bandwidth positioning reference signals are used to measure time differences, then positioning accuracy is improved, but power consumption increases
Solution Approach 1:
The patent segments the bandwidth into multiple candidate frequency resources and transmits reference signals on these segmented resources. By using phase differences across the segmented frequencies rather than requiring a single large-bandwidth signal, the system achieves ranging accuracy while keeping power consumption low, as each individual frequency resource can be transmitted with lower power.
Solution Approach 2:
The patent changes the approach from using large bandwidth as the primary means to achieve accuracy to using phase differences across multiple frequencies. This parameter change allows the system to achieve ranging accuracy through the phase information across N frequency resources rather than through raw bandwidth, thereby reducing the power required for transmission.
3Adaptability or versatility
If AMP devices transmit reference signals on multiple frequency-domain resources, then positioning and ranging capability is enabled, but signal transmission complexity increases
Solution Approach 1:
The patent makes the frequency-domain resources universal by allowing the same reference signal transmission mechanism to be applied across multiple candidate frequencies. The AMP device uses a unified approach where the reference signal is transmitted on N candidate frequency resources, and the receiver processes these signals using a consistent method (measuring phase differences), thereby enabling positioning capability without proportionally increasing transmission complexity.
Solution Approach 2:
The patent replaces complex time-domain signal processing with simpler frequency-domain phase difference measurement. Instead of requiring complex correlation or cross-correlation processing in the time domain, the system uses phase differences between frequency components, which can be measured and processed more simply, thereby reducing signal transmission and processing complexity while enabling positioning.
Data Source
AI summary
A method for wireless communication, an ambient power (AMP) device, and a communication device are provided. The method for wireless communication includes the following. An AMP device transmits a reference signal on N candidate frequency-domain resources. The reference signal transmitted on the N candidate frequency-domain resources is used to determine a position of the AMP device or a position of a receiver of the reference signal, and/or the reference signal transmitted on the N candidate frequency-domain resources is used to determine a distance between the AMP device and the receiver of the reference signal. N is a positive integer and N>2.