NTN Cell Selection via Core Network Ephemeris Data
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Solution Overview
Problem
Wireless communication devices face inefficiencies in cell selection and reselection processes, particularly in non-terrestrial network (NTN) environments, where repeated cell searches consume power and are inefficient, especially when transitioning from terrestrial network (TN) to NTN cells.
Innovation Solution
A method where a core network node transmits NTN cell information, including ephemeris, location assistance data, and cell configuration data, to a wireless terminal, allowing it to select or reselect NTN cells while camped on a TN cell without performing extensive cell searches, by determining the optimal time for transition based on coverage start time and orbital path data.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If wireless terminals perform repeated cell searches to transition from TN to NTN cells, then cell selection reliability is improved, but power consumption increases and communication efficiency decreases
Solution Approach 1:
The core network node provides NTN cell information (including ephemeris, location assistance data, and coverage start time) to the wireless terminal in advance before the terminal needs to select an NTN cell. This preliminary provision of information allows the terminal to determine the optimal transition time without performing repeated cell searches, thereby reducing power consumption while maintaining reliable cell selection.
2Reliability
If wireless terminals perform repeated cell searches to transition from TN to NTN cells, then cell selection reliability is improved, but communication efficiency deteriorates
Solution Approach 1:
The core network node provides NTN cell information (including ephemeris, location assistance data, and coverage start time) to the wireless terminal in advance before the terminal needs to select an NTN cell. This preliminary provision of information allows the terminal to determine the optimal transition time without performing repeated cell searches, thereby reducing power consumption while maintaining reliable cell selection.
3Use of energy by moving object
If wireless terminals wait for TN signal loss before searching for NTN cells, then power consumption is reduced, but transition time increases and communication efficiency deteriorates
Solution Approach 1:
The core network node provides NTN cell information (including coverage start time) to the wireless terminal in advance. The terminal can use this information to determine the optimal transition time before TN signal loss occurs, allowing seamless handover to NTN cells without waiting for signal loss, thereby reducing transition time while maintaining low power consumption.
Solution Approach 2:
The core network node provides feedback information (NTN cell information including ephemeris and coverage start time) to the wireless terminal based on the terminal's location and movement state. This feedback enables the terminal to make informed decisions about the optimal transition time, balancing power consumption and transition speed effectively.
Data Source
AI summary
A wireless terminal is described. The wireless terminal includes transmitting circuitry configured to request non-terrestrial network (NTN) cell information from a core network node to determine a time for cell selection/reselection. The wireless terminal also includes receiving circuitry configured to receive the NTN cell information from the core network node.