Terminal NAS/AS Location Feedback for Satellite Cell Selection
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Solution Overview
Problem
The complexity of network selection is increased in mobile networks with satellite access due to larger coverage areas of cells, leading to situations where selected networks cannot serve users at geographic borders, resulting in registration failures.
Innovation Solution
A terminal's NAS receives a cause value indicating an unsuitable network, saves the geographic location and network ID, and provides this information to the AS to guide cell selection and reselection, avoiding unsuitable areas and improving registration success.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If satellite access is introduced to expand coverage area, then the coverage area of cells is greatly increased, but the complexity of network selection by the terminal is greatly increased
Solution Approach 1:
The terminal performs preliminary actions by recording geographic location information and network identification information when receiving the first cause value, and provides this information to the AS in advance to guide subsequent cell selection, avoiding the need for complex real-time analysis during network selection
Solution Approach 2:
The terminal uses feedback mechanisms by recording the first cause value and providing it back to the AS, which then uses this feedback information to guide cell selection and reselection processes, improving network selection accuracy without increasing terminal complexity
2Area of stationary object
If the coverage area of cells is increased with satellite access, then more areas can be covered, but a situation occurs that the network selected by the terminal in a geographic border area may not be able to provide service for the user
Solution Approach 1:
The terminal performs preliminary recording of geographic location and network ID when receiving the first cause value, and provides this information to the AS in advance, enabling the AS to make informed cell selection decisions that ensure service availability at geographic borders
Solution Approach 2:
The terminal provides feedback information including the first cause value, geographic location, and network ID to the AS, which uses this feedback to guide cell selection and reselection processes, ensuring reliable service availability in geographic border areas
Data Source
AI summary
A processing method of a non-access stratum (NAS) and an access stratum (AS) of a terminal includes: receiving by the NAS of the terminal, a specific cause value from a first network, wherein the specific cause value indicates that a network is unable to serve at a current terminal location; saving by the NAS of the terminal, a geographic location and an identification (ID) of the first network, wherein the geographic location is a geographic location of the terminal in response to receiving the specific cause value from the first network; and providing by the NAS of the terminal, first information that comprises the geographic location for the AS of the terminal.