5G NTN UE Segment Duration Selection for Uplink Interference
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Solution Overview
Problem
In 5G non-terrestrial networks (NTN), user equipment (UE) faces challenges in efficiently pre-compensating uplink transmissions due to fast-changing timing advance and frequency shift caused by satellite movement, leading to interference issues. Additionally, there is a lack of effective methods for the UE to indicate the selection of segment duration to network devices.
Innovation Solution
The proposed solution involves a method where a first device receives a configuration of multiple segment durations from a second device and determines an appropriate segment duration based on factors such as time drift or elevation angle. This segment duration is then used to determine a transmission scheme, allowing the UE to implicitly indicate its selected segment duration to the network device.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a large number of repetitions are used to improve link budgets, then transmission reliability is improved, but uplink transmission interference increases due to timing advance changes
Solution Approach 1:
The patent divides the repetition transmissions into multiple segments, where each segment uses a fixed timing advance value. This segmentation allows the system to maintain the benefits of multiple repetitions for link budget improvement while preventing timing advance changes within a segment that would cause uplink interference. The network device configures multiple segments with different timing advance values, and the UE applies each timing advance value to its corresponding segment.
2Manufacturing precision
If the UE divides repetitions into segments to adjust transmission alignment, then uplink transmission alignment is improved, but the complexity of indicating segment duration selection increases
Solution Approach 1:
The patent enables the UE to autonomously determine and select the appropriate segment duration from a set of configured durations based on its own assessment of time drift conditions. The UE calculates time drift between segments and selects a segment duration that ensures proper alignment without requiring network device intervention or complex signaling. This self-service approach reduces indication complexity while maintaining transmission alignment.
3Adaptability or versatility
If the network device configures multiple segment durations, then adaptability to different transmission conditions is improved, but the difficulty of determining which segment duration to use increases
Solution Approach 1:
The patent implements a feedback mechanism where the UE measures time drift between segments and uses this measurement to select the appropriate segment duration from the configured set. The UE continuously monitors timing conditions and adjusts its segment duration selection based on the measured time drift, ensuring optimal transmission alignment. This feedback-driven selection simplifies the decision process compared to random or fixed selection methods.
Data Source
AI summary
Example embodiments of the present disclosure relate to devices, methods, apparatuses and computer readable storage media for beam information reporting. In example embodiments, a first device receives from a second device a configuration of a plurality of segment durations for transmission from the first device to the second device. Further, the first device determines a segment duration of the plurality of segment durations. Moreover, the second device determines a transmission scheme based on the determined segment duration.