Positioning Reference Signal Hopping for Bandwidth-Limited NR-Light UE
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Solution Overview
Problem
Newer, bandwidth-limited wireless devices, such as NR-Light UE, lack sufficient processing power and bandwidth to utilize current positioning technologies, resulting in reduced positioning accuracy and limited coverage.
Innovation Solution
Implement frequency hopping techniques for positioning reference signals (PRS) within NR systems, including intra-PRS and inter-PRS frequency hopping, to efficiently transmit and receive PRS across multiple frequency ranges, reducing the bandwidth requirements for positioning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If current positioning technologies (PRS transmissions) are used, then positioning accuracy can be improved, but bandwidth-limited devices lack sufficient processing power and bandwidth to utilize them effectively
Solution Approach 1:
The PRS transmission is divided into multiple parts transmitted at different frequencies. Each part occupies a different frequency range and can be received separately by bandwidth-limited devices, allowing the device to process smaller frequency segments rather than requiring full bandwidth capability
Solution Approach 2:
The patent introduces frequency hopping across multiple frequency ranges as an additional dimension for PRS transmission. Instead of transmitting all PRS components in a single frequency band, the system distributes them across multiple frequency dimensions, enabling bandwidth-limited devices to access positioning signals within their operational bandwidth constraints
2Measurement precision
If PRS transmissions occupy multiple frequency ranges, then positioning accuracy improves, but device complexity and processing requirements increase
Solution Approach 1:
By segmenting the PRS transmission into multiple frequency parts, each part can be processed independently by bandwidth-limited devices. This reduces the processing complexity for each individual reception event while maintaining overall positioning accuracy through combination of multiple measurements
Solution Approach 2:
The PRS parts are transmitted periodically across different frequency ranges using frequency hopping patterns. This periodic structure allows bandwidth-limited devices to predict and efficiently process signals at expected time-frequency locations, reducing processing complexity compared to aperiodic or continuous wideband transmissions
3Quantity of substance
If frequency hopping is implemented for PRS, then bandwidth requirements are reduced, but transmission complexity increases
Solution Approach 1:
The frequency-hopped PRS transmission is segmented into multiple parts that can be transmitted using existing NR physical layer structures. Each part follows standard NR frame structures and resource allocations, allowing base stations to implement frequency hopping using modified but not entirely new transmission procedures
Solution Approach 2:
The system implements dynamic frequency hopping where the frequency range for each PRS part is determined based on device capability information. Base stations can adaptively select frequency ranges and hopping patterns matched to specific device bandwidth capabilities, optimizing transmission efficiency while managing complexity
Data Source
AI summary
Techniques are provided for positioning bandwidth limited user equipment (UE). In an example method for providing a positioning reference signal (PRS) to a bandwidth limited user equipment includes generating a PRS comprising a plurality of symbols occupying a frequency range in a first slot of a radio frame, the PRS including a first set of the plurality of symbols occupying a first portion of the frequency range, a second set of the plurality of symbols occupying a second portion of the frequency range, and transmitting the PRS to the bandwidth limited user equipment.