Time Offset Maintenance for Nonterrestrial Network User Equipment
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Solution Overview
Problem
Non-terrestrial networks (NTNs) face challenges in maintaining accurate timing offsets due to large propagation delays caused by satellite communications, which affect downlink to uplink interactions and lead to issues in HARQ retransmissions and beam failure recovery responses.
Innovation Solution
A baseband processor system that determines and updates time offsets for user equipment (UE) and base stations, using timing offset indication signals to account for changing propagation delays, enabling precise MAC control element activation timing and efficient HARQ retransmissions and beam failure recovery in NTN communication systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If satellite communications are used in NTN to provide wide coverage, then coverage area is improved, but propagation delay increases
Solution Approach 1:
The baseband processor determines and applies a time offset value before downlink to uplink interactions occur. This preliminary timing adjustment compensates for the large propagation delay inherent in satellite communications, ensuring that timing alignment is maintained despite the extended distance between user devices and the satellite relay station.
2Reliability
If time offset is maintained for NTN to ensure timing alignment, then communication reliability is improved, but device complexity increases
Solution Approach 1:
The baseband processor autonomously determines the time offset value based on timing offset indication signals received from the satellite or ground-based station. The system self-adjusts its timing without requiring complex external coordination or manual intervention, maintaining reliability while managing complexity through automated operation.
3Measurement precision
If timing offset indication signals are processed to update time offset, then timing precision is improved, but processing complexity increases
Solution Approach 1:
The time offset value is dynamically updated based on received timing offset indication signals. Rather than using a static timing adjustment, the baseband processor continuously adapts the time offset to account for changing propagation conditions, satellite motion, and varying distances, thereby maintaining high timing precision through dynamic adjustment.
Data Source
AI summary
A user equipment (UE) associated with a non-terrestrial network (NTN) is disclosed. The UE comprises a processor configured to determine a first time offset, based on processing a timing offset indication signal comprising the first time offset or an associated parameter, received from a base station. In some embodiments, the first time offset is indicative of a time delay in downlink (DL) to uplink (UL) interaction between the UE and the base station. The processor is further configured to determine a second time offset, based on processing a subsequent timing offset indication signal comprising the second time offset or an associated parameter, received from the base station at a subsequent time instance. In some embodiments, the processor is further configured to update the first time offset with the second time offset.