Deriving Cell Reference Location in NTN Using Satellite Ephemeris
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently deriving and updating cell reference locations, particularly in non-terrestrial networks (NTN) like satellite-based systems, which require frequent updates to manage mobility and reduce signaling overhead.
Innovation Solution
The method involves a User Equipment (UE) receiving information about a first reference location of a cell and assistance information associated with the cell. The UE then derives a second reference location based on this assistance information and uses it to evaluate location-based events or measurements, thereby reducing the frequency of updates and minimizing signaling overhead.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If cell reference location information is updated frequently to maintain accuracy in NTN environments, then measurement precision and handover decision accuracy are improved, but signaling overhead increases
Solution Approach 1:
The network pre-configures the UE with assistance information including satellite ephemeris data and cell reference location parameters before the UE needs to perform location-based measurements. This preliminary provision of data allows the UE to derive accurate cell reference locations without requiring frequent network updates, thereby reducing signaling overhead while maintaining measurement precision
Solution Approach 2:
The UE derives cell reference location by copying and processing satellite ephemeris information and assistance data provided by the network, rather than receiving direct cell reference location updates. This copying approach allows the UE to independently calculate accurate locations based on satellite position data, reducing the need for frequent network signaling
2Measurement precision
If satellite ephemeris information is updated frequently to maintain validity in NTN, then location accuracy is improved, but power consumption increases
Solution Approach 1:
The network provides satellite ephemeris information and assistance data to the UE in advance, allowing the UE to store and process this data locally. This preliminary action enables the UE to maintain accurate satellite position calculations without frequent power-intensive updates from the network, thereby reducing power consumption while preserving ephemeris validity
Solution Approach 2:
The UE autonomously derives cell reference locations by processing stored satellite ephemeris information and assistance data using onboard computational resources. This self-service approach allows the UE to maintain accurate location measurements without requiring frequent network communications, significantly reducing power consumption compared to receiving continuous updates
3Loss of information
If cell reference location is derived using assistance information processing, then signaling overhead is reduced, but device complexity increases
Solution Approach 1:
The patent extracts and utilizes specific key parameters from satellite ephemeris information and assistance data (such as satellite position coordinates, orbital elements, and cell reference parameters) that are necessary for deriving cell reference location. By extracting only the essential data elements rather than processing complete datasets, the UE reduces computational complexity while still achieving accurate location derivation with minimal signaling overhead
Data Source
AI summary
Methods, systems, and apparatuses are provided for deriving cell reference location in a wireless communication system. A method for a UE in the wireless communication system can comprise receiving information of a first reference location of a cell, receiving an assistance information associated with the cell, deriving and/or acquiring a second reference location of the cell based on at least the assistance information, and using the second reference location of the cell to evaluate a location-based event or measurement.