LEO Satellite Paging Area Identifier Mapping
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Solution Overview
Problem
In non-terrestrial networks (NTNs) with low earth orbit (LEO) satellites, the continuous movement of satellites relative to the ground causes frequent changes in coverage areas, leading to inefficiencies in paging terminal devices due to the core network and LEO satellites not being able to timely learn and adapt to these changes.
Innovation Solution
A communication method where a first device sends location information at multiple moments to a core network device, allowing for the exchange of area identifiers corresponding to these locations, thereby enabling timely and efficient updates of coverage areas and improving paging efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If LEO satellite continuously moves relative to the ground, then coverage area changes continuously providing seamless coverage, but core network device and LEO satellite cannot learn of the coverage area timely leading to low paging efficiency
Solution Approach 1:
The patent applies preliminary action by having the first device pre-calculate and store correspondence between locations/moments and area identifiers before paging operations. When paging is needed, the system can quickly retrieve the relevant area identifier based on the terminal's location and the satellite's movement trajectory, avoiding real-time calculation delays and improving paging efficiency while maintaining coverage adaptability
Solution Approach 2:
The patent implements feedback mechanisms where the first device continuously monitors and reports coverage area changes to the core network device. The core network device receives location information and movement trajectories, processes this feedback data, and updates the area identifier correspondences accordingly, enabling the system to adapt to continuous satellite movement while maintaining efficient paging through updated location-area mappings
2Productivity
If first device stores area identifiers for multiple locations, then paging efficiency can be improved, but storage load of the first device increases
Solution Approach 1:
The patent applies segmentation by dividing the area identifier storage into multiple components: the first device stores only the correspondence between locations/moments and area identifiers, while the core network device stores the actual area identifier data and terminal location information. This segmentation reduces the storage burden on the first device while maintaining the ability to perform efficient paging operations through coordinated access to distributed storage resources
Data Source
AI summary
Example communication methods and apparatus are described. One example method includes receiving first information from a first device, where the first information indicates N moments and location information of the first device at the N moments. The first device obtains second information, where the second information indicates a correspondence between the N moments and M area identifiers, or the second information indicates a correspondence between N locations and M area identifiers. According to the foregoing technical solution, the first device sends the location information of the first device at the N moments, so that the M area identifiers corresponding to the first device at the N moments or the M area identifiers corresponding to N pieces of location information can be obtained.