System Information Repetition for Epoch Time Ambiguity
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Solution Overview
Problem
In non-terrestrial networks, the ambiguity issue arises when common timing advance and ephemeris parameters are updated at any time within a modification period, leading to uncertainty in determining which system information window is used for implicit epoch time indication, especially when repetitive transmissions across SI windows are allowed.
Innovation Solution
The solution involves determining an epoch time based on specific SI windows, where the network broadcasts the number of SI windows used for repetitive transmissions of the same SIB, allowing the UE to derive which SI window is used for epoch time indication, thereby resolving the ambiguity issue.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If repetitive transmissions of SIB across multiple SI windows are allowed, then coverage performance is improved, but ambiguity arises in determining which SI window is used for implicit epoch time indication
Solution Approach 1:
The network pre-configures and broadcasts the number of SI windows (K) used for repetitive SIB transmissions before the actual transmissions occur. This preliminary information allows the UE to deterministically identify which specific SI window contains the epoch time indication, eliminating ambiguity while enabling repetitive transmissions across multiple windows for improved coverage.
2Adaptability or versatility
If common TA and ephemeris parameters are updated at any time within modification period, then adaptability is improved, but difficulty in detecting and measuring epoch time increases
Solution Approach 1:
The network provides feedback information (the number of SI windows K) that enables the UE to correctly interpret and detect the epoch time indication. This feedback mechanism allows the system to maintain flexible parameter updates while giving the UE the necessary information to unambiguously identify the epoch time, resolving the detection difficulty.
Data Source
AI summary
Presented are systems and methods for system information repetition. A wireless communication device may identify a number of system information (SI) windows for repetitive transmissions of a system information block (SIB). The wireless communication device may determine an epoch time based on at least one of the SI windows.