Satellite Switching Without PCI Change
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Solution Overview
Problem
Existing wireless communication systems face challenges in switching satellites without changing the physical cell identifier (PCI), which can lead to service disruptions and increased capital and operational expenditures, especially in disaster situations and low-demand areas.
Innovation Solution
A satellite switching method that allows for seamless switching between satellites without changing the PCI, by obtaining target satellite-related information from a source satellite, performing satellite switching, and establishing communication with the target satellite without a random access procedure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If satellite switching is performed by changing PCI, then the terminal can identify the target satellite, but service disruption occurs and communication continuity is broken
Solution Approach 1:
The source satellite provides target satellite-related information (including target PCI, frequency, and timing advance) in advance before actual switching occurs. This preliminary information transfer enables the terminal to prepare for switching without requiring PCI change during the transition, thus maintaining service continuity while avoiding the complexity of PCI change management
Solution Approach 2:
The source satellite acts as an intermediary that transfers target satellite information to the terminal before the actual handover. This intermediary mechanism allows the terminal to access target satellite parameters without directly encountering the complexity of PCI changes, resolving the contradiction between service continuity and device complexity
2Reliability
If random access procedure is required for satellite switching, then the terminal can synchronize with target satellite, but random access channel congestion occurs and switching time increases
Solution Approach 1:
The source satellite provides target satellite timing advance information in advance. The terminal applies this pre-provided timing advance directly during switching, eliminating the need for time-consuming random access procedures while maintaining accurate synchronization with the target satellite
Solution Approach 2:
The patent extracts the essential synchronization function from the random access procedure by using pre-provided timing advance information. This extraction allows the terminal to achieve synchronization without undergoing the full random access process, thereby reducing switching time while maintaining synchronization accuracy
3Adaptability or versatility
If traditional satellite switching is used, then the terminal can switch satellites, but capital and operational expenditures increase in low-demand areas
Solution Approach 1:
The terminal autonomously performs satellite switching using pre-provided target satellite information without requiring complex network coordination or additional infrastructure. This self-service capability reduces the need for expensive network resources and operational support in low-demand areas while maintaining full switching functionality
Data Source
AI summary
A method of a terminal may comprise: obtaining target satellite-related information from a source satellite; performing satellite switching from the source satellite to a target satellite based on the target satellite-related information; and performing communication with the target satellite based on the target satellite-related information after performing the satellite switching.