Uplink Synchronization Updates with Coordinated GNSS and Ephemeris
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Solution Overview
Problem
In non-terrestrial networks, the separate and sporadic acquisition of GNSS and ephemeris information for uplink synchronization in user equipment (UE) leads to high complexity and increased power consumption due to the need for separate measurement gaps and independent scheduling considerations.
Innovation Solution
A terminal device aligns the updating procedures for GNSS and ephemeris information by performing both if one is expired and the remaining duration of the other is shorter than a threshold, reducing the need for multiple measurement gaps and optimizing power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate procedures are used to update GNSS information and ephemeris information independently, then the synchronization accuracy is maintained, but the device complexity and power consumption increase due to separate measurement gaps and scheduling
Solution Approach 1:
The patent combines the update procedures for GNSS information and ephemeris information into a single coordinated process. When either information type expires or approaches expiration (within threshold duration), both are updated together in one measurement gap, eliminating the need for separate measurement gaps and reducing scheduling complexity while maintaining synchronization accuracy.
Solution Approach 2:
The patent introduces a threshold duration mechanism that triggers update procedures before actual expiration occurs. By monitoring remaining validity durations and initiating updates when thresholds are approached, the system proactively prevents synchronization issues while optimizing the timing of measurement gaps to reduce their frequency and duration.
2Loss of information
If separate measurement gaps are allocated for GNSS and ephemeris information updates, then the information freshness is maintained, but the power consumption increases due to frequent independent acquisitions
Solution Approach 1:
The patent merges the acquisition operations for GNSS and ephemeris information into a single measurement gap when both need updating. This coordination reduces the total number of measurement gaps required, as the UE can acquire both information types simultaneously rather than performing separate acquisition procedures, thereby reducing power consumption while maintaining information freshness.
Solution Approach 2:
The patent implements a threshold-based periodic update mechanism where updates are triggered based on remaining validity durations. By setting appropriate thresholds and updating information periodically based on these thresholds rather than continuously or independently, the system optimizes the frequency of acquisitions to maintain freshness while minimizing power consumption.
3Reliability
If independent scheduling is used for GNSS and ephemeris information updates, then the synchronization reliability is improved, but the network design complexity increases
Solution Approach 1:
The patent simplifies network scheduling by combining the update procedures for GNSS and ephemeris information into a single coordinated process. The network device only needs to allocate and manage one measurement gap when both information types require updating, rather than independently scheduling separate gaps, thereby reducing scheduling complexity while maintaining synchronization reliability through the coordinated update approach.
Data Source
AI summary
Example embodiments of the present disclosure relate to a terminal device, a network device, methods, apparatuses and a computer readable storage medium for updating information for uplink synchronization. The terminal device determines a first threshold duration for first information for uplink synchronization and a second threshold duration for second information for the uplink synchronization; and performs a first procedure for updating the first information and a second procedure for updating the second information based on: determining that a validity duration of one piece of information expires and a remaining validity duration of the other piece of information is shorter than corresponding threshold duration. As such, the two procedures updating the first information and the second information may be aligned with each other, thus the complexity can be reduced, the power consumption can be reduced, and the communication efficiency may be improved.