Timing Advance Determination in Satellite Wireless Networks
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Solution Overview
Problem
Conventional wireless communication systems, particularly in satellite communication scenarios, face challenges in determining accurate timing advance amounts due to large propagation delays, leading to potential random access failures and inability to measure actual timing-related processing parameters, especially in ultra-long coverage scenarios like geostationary satellite communications.
Innovation Solution
A method where a user equipment (UE) calculates an approximate timing advance amount based on its position and satellite base station ephemeris, fine-tunes it through a random access process, and transmits this information to the base station, which combines it with fine-tuned timing advance amounts to determine a complete timing advance, allowing for accurate propagation delay compensation and alignment of uplink transmissions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional timing advance determination methods are used in satellite communication, then the system structure remains simple, but timing accuracy deteriorates due to large propagation delays
Solution Approach 1:
The timing advance determination is divided into multiple stages: initial timing advance calculation based on location information, random access procedure for fine-tuning, and combination of both to obtain complete timing advance. This segmentation allows the system to handle large propagation delays in satellite communication by breaking down the complex timing determination into manageable steps.
Solution Approach 2:
The system performs preliminary timing advance calculation using location information before the random access procedure. This preliminary action provides an initial timing estimate that is then refined during the random access process, allowing the system to prepare timing information in advance and reduce overall timing determination complexity.
2Reliability
If timing advance is not accurately determined in ultra-long coverage scenarios, then random access failures increase, but implementing complex timing measurement procedures increases system complexity
Solution Approach 1:
The random access procedure provides feedback mechanism where the base station receives timing information from the user equipment and adjusts the timing advance accordingly. This feedback loop ensures accurate timing advance determination while maintaining system reliability in ultra-long coverage scenarios like geostationary satellite communications.
Solution Approach 2:
The system changes timing parameters dynamically based on the communication scenario. In ultra-long coverage scenarios, the system uses location information and ephemeris data to calculate timing advance, then refines it through random access procedures. This parameter adjustment approach improves reliability without requiring overly complex fixed procedures.
3Measurement precision
If conventional timing methods are used without location information, then the procedure remains simple, but timing precision deteriorates
Solution Approach 1:
Location information acts as an intermediary that enables more precise timing advance determination without requiring direct complex measurements. The base station uses location information from the user equipment to calculate initial timing advance, which then serves as a foundation for further refinement through random access procedures.
Solution Approach 2:
The system incorporates location information as an additional parameter to determine timing advance. By using location data combined with ephemeris information, the system achieves higher timing precision while managing processing complexity through structured calculation approaches.
Data Source
AI summary
Techniques are described to determine timing advance amount. For example, a first device receives, from a second device, a message comprising one or more fields that include information indicative of a communication delay between the first device and the second device. The first device processes the message to use the information for a transmission between the second device and the first device.