UE Positioning via Relative Reference in Non-Terrestrial Networks
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Solution Overview
Problem
Wireless communication systems face high power consumption when UEs periodically perform position acquisition procedures using GNSS, especially in non-terrestrial networks where large distances lead to significant timing and frequency variations, necessitating frequent updates.
Innovation Solution
Implementing a method where a set of UEs share the burden of performing position acquisition procedures by designating a reference UE to periodically determine its position, allowing other UEs to calculate their positions based on relative positions, thereby reducing the frequency of position updates and power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If UEs periodically perform position acquisition procedures using GNSS, then positioning accuracy is maintained, but power consumption increases
Solution Approach 1:
The patent segments the positioning task by designating one UE as a reference UE that performs position acquisition procedures, while other non-reference UEs determine their positions relative to the reference UE. This divides the energy-consuming GNSS operations among UEs, reducing individual power consumption while maintaining positioning accuracy through relative position calculations.
Solution Approach 2:
Non-reference UEs determine their own positions by calculating relative positions to the reference UE using received signal strength measurements and known reference UE position, rather than independently performing full position acquisition procedures. This self-service approach reduces the frequency and power consumption of GNSS operations for non-reference UEs.
2Reliability
If UEs frequently update positions in non-terrestrial networks, then timing and frequency synchronization is maintained, but resource utilization efficiency decreases
Solution Approach 1:
The patent segments the synchronization maintenance task by having the reference UE perform position acquisition procedures at scheduled intervals to update timing and frequency compensation values, while non-reference UEs use these updated values without performing independent position acquisitions. This reduces overall network resource consumption while maintaining synchronization reliability.
Solution Approach 2:
The reference UE performs position acquisition procedures periodically at scheduled intervals rather than continuously, updating timing and frequency compensation values at these periodic intervals. This periodic approach maintains synchronization reliability while improving resource utilization efficiency by avoiding continuous high-power operations.
Data Source
AI summary
Methods, systems, and devices for wireless communications are described. A user equipment (UE) may determine a position (e.g., a global navigation satellite system (GNSS)) position of the UE based on a relative position of the UE to another UE. For example, a first UE may determine (e.g., calculate, receive) a relative position of the first UE to a second UE that is selected from a set of UEs including the first UE and the second UE to perform a position acquisition procedure to determine a position of the second UE. The first UE may determine (e.g., calculate, receive) its position based on the relative position of the first UE to the second UE and the position of the second UE and may reset a timer that indicates for the first UE to perform a position acquisition procedure upon expiration of the timer.