Satellite Switching With Resynchronization for Uplink Synchronization
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Solution Overview
Problem
Existing wireless communication systems face challenges in managing satellite switching efficiently, particularly in Non-Terrestrial Networks (NTN), leading to potential loss of uplink synchronization and increased signaling overhead due to the need for frequent handovers when satellite configurations change.
Innovation Solution
A method for satellite switching with resynchronization is introduced, allowing User Equipment (UE) to perform satellite switches with resynchronization based on specific timing conditions and RRC states, independent of the RRC state at the time of receiving System Information Block 19 (SIB19), thereby maintaining uplink synchronization and reducing the need for handovers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional handover procedures are used for satellite switching, then uplink synchronization can be maintained, but signaling overhead increases and handover interruption time increases
Solution Approach 1:
The network pre-configures satellite switching parameters including target satellite information, switching timing, and resynchronization parameters in SIB19 before the actual satellite switch occurs. This allows the UE to prepare for the switch in advance without needing to perform real-time handover procedures, thereby reducing interruption time while maintaining synchronization.
Solution Approach 2:
The patent extracts the essential handover functions into a simplified satellite switching mechanism that operates independently of traditional RRC handover procedures. By separating satellite switching from standard handover, the system eliminates unnecessary signaling overhead and interruption time associated with full handover protocols while preserving uplink synchronization through targeted resynchronization actions.
2Reliability
If traditional handover procedures are used for satellite switching, then uplink synchronization can be maintained, but signaling overhead increases
Solution Approach 1:
The patent extracts the essential handover functions into a simplified satellite switching mechanism that operates independently of traditional RRC handover procedures. By separating satellite switching from standard handover, the system eliminates unnecessary signaling overhead associated with full handover protocols while preserving uplink synchronization through targeted resynchronization actions.
Solution Approach 2:
The network pre-configures satellite switching parameters including target satellite information, switching timing, and resynchronization parameters in SIB19 before the actual satellite switch occurs. This allows the UE to prepare for the switch in advance without needing to perform real-time handover procedures, thereby reducing signaling overhead while maintaining synchronization.
3Loss of information
If satellite switching is performed without resynchronization, then signaling overhead is reduced, but uplink synchronization is lost
Solution Approach 1:
Instead of performing full resynchronization procedures, the patent applies partial resynchronization only to the uplink timing parameters that are affected by satellite switching. This selective approach maintains uplink synchronization without requiring complete re-establishment of the connection, thereby reducing signaling overhead while preserving necessary synchronization.
Data Source
AI summary
Methods, systems, and apparatuses are provided for handling satellite switching in a wireless communication system, wherein a method of a User Equipment (UE) comprises receiving a System Information Block 19 (SIB19) at a first timing, wherein the UE is in Radio Resource Control (RRC)_IDLE or RRC_INACTIVE at the first timing, and determining to initiate a satellite switch with resynchronization at a second timing when the UE is in RRC_CONNECTED, based on SatSwitchWithResync and t-Service being included in the SIB19.