Coverage Window Refinement for Satellite Paging
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Solution Overview
Problem
Current coverage window prediction algorithms for non-terrestrial networks, especially with low Earth orbit satellites, are inaccurate due to neglecting user equipment movement, leading to misalignment between user equipment and network coverage, resulting in unsuccessful paging and inefficient power usage.
Innovation Solution
A method where both terminal devices and network devices dynamically determine and update the coverage window by monitoring radio coverage and adjusting based on actual availability, using additional windows when necessary to improve alignment and increase successful paging chances.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If coverage window prediction algorithms are used for non-terrestrial networks, then power consumption is reduced by limiting monitoring to predicted coverage periods, but coverage window alignment accuracy deteriorates due to user equipment movement not being accounted for
Solution Approach 1:
The patent implements feedback mechanisms where the network device receives paging response information from the terminal device and uses this feedback to update the coverage window. The terminal device monitors radio coverage during the coverage window and provides feedback on actual coverage availability, allowing the network device to refine and adjust the coverage window prediction to improve accuracy while maintaining power efficiency.
Solution Approach 2:
The patent makes the coverage window dynamic by allowing it to be updated based on actual paging responses and radio coverage monitoring. Instead of using a static predicted coverage window, the system continuously adapts the coverage window parameters (timing, duration) based on real-world observations of when the terminal device is actually in coverage, thereby accounting for user equipment movement.
2Use of energy by moving object
If coverage window prediction algorithms are used for non-terrestrial networks, then monitoring operations are reduced to save power, but paging success rate deteriorates due to misalignment between terminal device and network coverage
Solution Approach 1:
The network device receives feedback from the terminal device indicating whether paging was successful during the coverage window. This feedback is used to update future coverage window predictions, allowing the system to learn from past paging outcomes and improve reliability while maintaining reduced monitoring operations for power savings.
Solution Approach 2:
The system performs preliminary coverage window prediction to establish initial monitoring and paging schedules. Based on the outcome of paging attempts and subsequent feedback, the coverage window is refined and updated for future operations, ensuring that preliminary actions are continuously improved based on actual results.
3Device complexity
If fixed coverage windows are used for paging, then network device operations are simplified, but adaptability deteriorates when user equipment movement patterns change
Solution Approach 1:
The patent transforms the fixed coverage window into a dynamic structure that can adapt to changing user equipment movement patterns. The coverage window parameters are updated based on actual paging responses and radio coverage monitoring, allowing the system to maintain simplicity in operation while gaining adaptability to varying movement conditions.
Solution Approach 2:
The system maintains a base coverage window prediction as a cushion or baseline operation. When paging failures occur or coverage conditions change, additional adjustments and updates are applied to the coverage window, providing a layered approach that maintains operational simplicity while preparing for and adapting to changing conditions.
Data Source
AI summary
Various example embodiments relate to devices and methods for refining a coverage window for discontinuous coverage. A terminal device may comprise at least one processor and at least one memory including computer program code. The at least one memory and the computer program code may be configured to, with the at least one processor, cause the terminal device to perform actions including determining a coverage window for receiving transmission from a network device, monitoring radio coverage of the network device at least during the coverage window, and updating the coverage window based on when the radio coverage is available for the terminal device.