Timing Offset Mechanism for NTN Propagation Delay Compensation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In wireless communication systems, particularly in Non-Terrestrial Networks (NTNs), the large propagation delay and round-trip delay pose challenges for synchronizing uplink and downlink transmissions, leading to interference and inefficiencies in mobile service support.
Innovation Solution
The implementation of a timing offset mechanism for interpreting Downlink Control Information (DCI) format 2_0, where the timing offset is applied differently for uplink and downlink slot formats, allowing for proper alignment of UL and DL transmissions to compensate for propagation delays, and dynamic slot format indications are used based on Timing Advance (TA) values.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single timing offset is applied to both uplink and downlink slot formats, then the system is simple to implement, but transmission interference occurs due to misalignment in NTN scenarios with large propagation delays
Solution Approach 1:
The patent divides the timing offset application into separate mechanisms for uplink and downlink slot formats. Instead of using a single unified timing offset, the system applies distinct timing offsets specifically for uplink transmissions, allowing independent optimization of uplink and downlink timing alignment to prevent interference in NTN scenarios.
Solution Approach 2:
The patent introduces dynamic slot format indications based on Timing Advance (TA) values. The timing offset configuration is made adaptive and dynamic, allowing the system to adjust timing offsets based on actual propagation delay conditions and TA values, rather than using static fixed timing offsets.
2Ease of operation
If slot formats are applied to uplink transmissions without timing offset adjustment, then the system operation is simple, but synchronization accuracy deteriorates due to large propagation delays
Solution Approach 1:
The patent changes the timing offset parameter specifically for uplink slot formats based on TA values and propagation delay conditions. By modifying the timing offset parameter dynamically, the system maintains simple slot format application procedures while achieving accurate synchronization in NTN scenarios with large propagation delays.
3Productivity
If dynamic slot format indications are implemented based on TA values, then transmission efficiency improves through proper timing alignment, but device complexity increases
Solution Approach 1:
The patent implements a feedback mechanism where Timing Advance (TA) values are used to dynamically control slot format indications. The system receives TA feedback from the network, processes this information, and adjusts slot format timing offsets accordingly, creating a closed-loop control system that optimizes transmission efficiency while managing complexity through standardized feedback processing.
Data Source
Figure 1
Figure 2
Figure 3
AI summary
A method and apparatus are disclosed. In an example from the perspective of a User Equipment, UE, the UE receives a Downlink Control Information, DCI, format from a base station (1305). The UE applies a timing offset to information indicated by the DCI format (1310).