Beam-Specific Group Delay Lookup Table Signaling for 5G Positioning
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Solution Overview
Problem
Current wireless communication systems, particularly in the 5G standard, face challenges in accurately determining the position of user equipment (UE) due to variations in group delay across different frequencies and beams, which affect the precision of round-trip-time (RTT) measurements and positioning accuracy.
Innovation Solution
The implementation of a method where user equipment (UE) and network entities exchange reference signals and group delay information through lookup tables, allowing the UE to transmit a parameter representing the difference in reception and transmission times, and enabling the network entity to estimate the UE's position based on this data and retrieved group delay information from the lookup tables.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If group delay information is not compensated for frequency and beam variations, then RTT measurements can be performed with simpler procedures, but positioning accuracy deteriorates due to group delay variations across different frequencies and beams
Solution Approach 1:
The patent applies preliminary action by having the network entity pre-calculate and store group delay values for different frequency resources and beams in lookup tables before RTT measurements are performed. The UE then simply retrieves and applies these pre-computed values during the measurement process, eliminating the need for complex real-time group delay calculations while maintaining high positioning accuracy.
Solution Approach 2:
The patent introduces lookup tables as an intermediary structure that stores pre-computed group delay information. These tables act as a mediator between the complex physical layer parameters (frequency, beam, group delay) and the RTT measurement process, allowing the UE to access accurate group delay compensation values without implementing complex calculation algorithms.
2Measurement precision
If beam-specific group delay compensation is implemented, then positioning accuracy improves by accounting for beam-specific variations, but signaling overhead increases due to transmission of beam-specific lookup tables
Solution Approach 1:
The patent applies local quality by providing different levels of group delay compensation information tailored to specific local conditions (frequency resources and beams). Instead of using a single generic compensation value for all measurements, the system provides beam-specific and frequency-specific lookup tables that contain locally optimized group delay values, allowing the UE to apply appropriate compensation for each specific measurement scenario.
Solution Approach 2:
The patent segments the group delay compensation information into multiple lookup tables, each dedicated to a specific beam and frequency resource combination. This segmentation allows the system to manage the complexity of beam-specific compensation by organizing data into discrete, manageable tables that can be selectively transmitted and stored, reducing overall signaling overhead compared to transmitting all possible combinations continuously.
3Measurement precision
If frequency-specific group delay compensation is applied, then RTT measurement accuracy improves by correcting frequency-dependent delays, but processing complexity increases due to multiple frequency-specific lookup tables
Solution Approach 1:
The patent applies preliminary action by pre-calculating and organizing frequency-specific group delay values into lookup tables before the RTT measurement process. The network entity performs the complex frequency-dependent delay analysis in advance and stores the results in an easily accessible format, allowing the UE to simply retrieve and apply the appropriate values during measurements without performing complex real-time frequency analysis.
Solution Approach 2:
The patent introduces frequency-specific lookup tables as intermediary data structures that bridge the gap between complex frequency-dependent group delay characteristics and the simplified RTT measurement process. These tables serve as a mediator that encapsulates the complexity of frequency-specific delay variations, allowing the UE to achieve high measurement accuracy without implementing complex frequency-domain processing algorithms.
Data Source
AI summary
Disclosed are techniques for reporting a group delay-per-frequency lookup table for transmit and receive beams. In an aspect, a user equipment (UE) receives, from a transmission-reception point (TRP), a first downlink reference signal on at least one downlink reference signal resource using a downlink receive beam, transmits, to the TRP, an uplink reference signal on at least one uplink reference signal resource using an uplink transmit beam, determines a parameter representing a difference between a reception time of the first downlink reference signal and a transmission time of the uplink reference signal, transmit the parameter to a network entity, and transmits, to the network entity, a first lookup table or an identifier of the first lookup table, wherein the first lookup table represents per-frequency group delay information for the downlink receive beam and/or the uplink transmit beam.