NTN Uplink Timing Advance Using Common and UE-Specific TA
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Solution Overview
Problem
Existing mobile communication systems face challenges in supporting explosive data traffic, increased transmission rates, and low latency while maintaining energy efficiency, particularly in non-terrestrial networks (NTN) where satellite-based communication is involved, due to the complexity of calculating timing advance (TA) values without relying on serving-satellite ephemeris information.
Innovation Solution
A method and apparatus for calculating UE-specific and common timing advance (TA) values in NTN systems without requiring serving-satellite ephemeris-related information, reducing signaling overhead and enabling efficient uplink transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If serving-satellite ephemeris information is provided to calculate UE-specific TA values, then uplink transmission timing accuracy is improved, but signaling overhead increases
Solution Approach 1:
The patent extracts and removes the requirement for serving-satellite ephemeris information from the TA calculation process. Instead of using ephemeris data, the system uses alternative methods such as common TA values broadcast by the base station or simplified UE-specific TA calculations that do not depend on detailed satellite orbital parameters, thereby eliminating the signaling overhead while maintaining timing accuracy
Solution Approach 2:
The patent uses common TA values that are broadcast to multiple UEs as a substitute for individual UE-specific TA calculations based on ephemeris. This copying approach allows UEs to use the same reference timing advance value, reducing the need for complex individual calculations and extensive signaling, while still achieving acceptable uplink synchronization
2Measurement precision
If complex TA calculation methods using ephemeris information are used, then timing accuracy is improved, but device complexity increases
Solution Approach 1:
The patent segments the TA calculation into simpler components that do not require processing of complex ephemeris data. Instead of a single complex calculation involving orbital parameters, the system divides timing adjustment into manageable parts using base station broadcast information and simplified UE-specific adjustments, reducing computational complexity while maintaining accuracy
Solution Approach 2:
The patent replaces complex, resource-intensive ephemeris-based calculations with simpler, lighter-weight TA calculation methods. The simplified calculation approach consumes fewer computational resources and processing power, making it suitable for mobile devices with limited capabilities while still achieving the required timing precision
3Reliability
If serving-satellite ephemeris information is always provided, then uplink synchronization is maintained, but system resource efficiency decreases
Solution Approach 1:
The patent implements periodic updates of common TA values by the base station instead of continuously providing ephemeris information. The base station broadcasts updated TA values at appropriate intervals, allowing UEs to maintain synchronization without requiring constant access to detailed satellite orbital data, thereby improving resource efficiency while preserving synchronization reliability
Solution Approach 2:
The patent creates a universal common TA value that serves multiple UEs simultaneously, replacing the need for individual UE-specific ephemeris-based calculations. This multi-functional approach allows a single broadcast message to synchronize multiple devices, reducing overall system signaling load and improving resource efficiency while maintaining reliable uplink synchronization across the cell
Data Source
AI summary
Disclosed are a method and apparatus for uplink transmission and reception in a wireless communication system. The method according to an embodiment of the present disclosure may comprise the steps of: receiving, from a base station, configuration information providing information necessary for UE to access the wireless communication system via an NTN including a satellite, the configuration information including first information regarding a UE-specific TA value and second information regarding common TA; determining a TA value on the basis of the UE-specific TA value given by the first information and the common TA value derived from the second information; and performing uplink transmission at a timing determined on the basis of the TA value.