ATG UE Timing Window for High-Speed SSB Synchronization
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Solution Overview
Problem
Existing air-to-ground (ATG) network deployments face challenges in maintaining accurate timing synchronization due to large cell coverage ranges and high flight speeds, leading to transmission errors that impact user experience and coexistence with terrestrial networks.
Innovation Solution
The implementation of a processor in user equipment (UE) to determine a timing window based on moving speed, encompassing synchronization signal blocks (SSBs) for precise time tracking, and a base station processor to adjust SSB transmissions accordingly, ensuring accurate timing adjustments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional timing synchronization is used in ATG networks, then network deployment is simplified, but timing accuracy deteriorates due to large cell coverage ranges and high flight speeds
Solution Approach 1:
The patent applies preliminary action by pre-determining the timing window based on UE moving speed before the actual transmission occurs. The processor calculates the timing window in advance using the known speed parameter, allowing the UE to prepare timing information ahead of time. This resolves the contradiction by performing the complex timing calculation beforehand rather than in real-time during transmission, thereby improving timing accuracy without increasing operational complexity.
Solution Approach 2:
The patent changes the parameter approach by introducing a speed-based timing window calculation instead of traditional fixed or network-provided timing methods. The timing window is dynamically determined based on the UE's moving speed parameter, allowing the system to adapt timing synchronization to the actual motion characteristics of the UE. This parameter change enables improved timing accuracy while keeping the implementation relatively simple.
2Measurement precision
If SSB transmissions are performed with fixed periodicity, then base station operation is simplified, but timing accuracy for high-speed UEs deteriorates
Solution Approach 1:
The patent applies dynamics by making the SSB transmission timing adaptive rather than fixed. The base station determines the timing window dynamically based on the UE's moving speed, and the SSB transmissions are scheduled within this dynamically calculated window. This allows the system to maintain timing accuracy for high-speed UEs while the base station only needs to implement a relatively simple speed-based calculation rather than complex real-time scheduling algorithms.
3Measurement precision
If timing window is enlarged to accommodate high flight speeds, then timing accuracy is improved, but transmission time consumption increases
Solution Approach 1:
The patent changes the timing window parameter based on the UE's moving speed parameter. By calculating the timing window as a function of speed, the system achieves timing accuracy appropriate for high-speed operation without unnecessarily enlarging the window for all cases. The timing window is optimized to match the actual speed conditions, thereby improving timing accuracy while minimizing time consumption compared to a universally enlarged window approach.
Data Source
AI summary
A user equipment (UE) is configured to determine a reference point for a transmission, determine a timing window based on a moving speed of the UE, wherein the timing window encompasses at least one synchronization signal block (SSB) transmitted by a base station and perform time tracking based on detecting the at least one SSB in the timing window and the determined reference point.