Wireless Mobility Handling With NTN Cell Reselection Priorities
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently managing mobility handling between terrestrial and non-terrestrial networks, particularly in scenarios where a large number of user equipment (UEs) need to be moved due to satellite movement, leading to inefficiencies and resource consumption.
Innovation Solution
A wireless communication method that involves prioritizing cells of a specific network type (NTN or TN) for cell reselection procedures based on received cell reselection information, using techniques such as adjusting frequency-level and cell-level reselection priorities, and configuring synchronization signal measurement timing configurations to optimize handover processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a large number of UEs are moved due to satellite movement, then network coverage is maintained, but resource consumption increases and efficiency decreases
Solution Approach 1:
The network node pre-configures measurement timing configurations for NTN cells before UEs need to reselect. This allows UEs to have measurement opportunities already established, reducing the need for frequent reconfiguration actions and associated resource consumption when mobility events occur
Solution Approach 2:
The measurement timing configuration is made dynamic and adaptable - the network can configure different measurement timing parameters based on satellite movement patterns, UE mobility states, and network conditions. This allows the system to optimize resource usage by adjusting measurement frequencies and timing windows rather than using fixed conservative parameters
2Reliability
If cell reselection procedures are performed frequently due to satellite movement, then UEs maintain connection, but latency increases and efficiency decreases
Solution Approach 1:
Measurement timing configurations are established in advance, allowing UEs to continuously monitor NTN cells without waiting for reconfiguration messages. This preliminary setup reduces the time required for cell reselection by eliminating configuration delays during actual mobility events
Solution Approach 2:
The measurement timing configuration enables continuous measurement opportunities for UEs, allowing them to maintain awareness of neighboring NTN cells without interruption. This continuity reduces reselection latency by ensuring measurement processes are always active rather than being periodically restarted
3Productivity
If measurement timing configurations are optimized for NTN cells, then mobility handling efficiency improves, but system complexity increases
Solution Approach 1:
The measurement timing configuration mechanism is designed to be universal - it can be applied to both terrestrial and non-terrestrial networks using the same configuration parameters and procedures. This multi-functionality allows the system to handle NTN mobility without requiring entirely separate complexity-heavy mechanisms
Solution Approach 2:
The system optimizes mobility handling by adjusting existing measurement timing parameters (such as measurement period, window offset, and duration) rather than introducing new complex mechanisms. These parameter changes within the existing framework improve efficiency while minimizing increases in system complexity
Data Source
AI summary
Mobility handling with wireless communication for use in a wireless terminal may include receiving, from a wireless network node, cell reselection information, and prioritizing at least one first cell of a first network type for selecting a cell for a cell reselection procedure based on the cell reselection information.