NTN Cell Reselection Using Location-Based Network Prioritization
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Solution Overview
Problem
Existing mobile communication systems struggle with efficient cell (re)selection in non-terrestrial networks (NTNs) due to the lack of effective methods for prioritizing network selection based on wireless transmit/receive unit (WTRU) location and network coverage areas.
Innovation Solution
A WTRU determines its location relative to terrestrial network (TN) coverage areas and selects a network type (TN or NTN) based on distance thresholds, performing measurements on the selected network type to optimize cell (re)selection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a WTRU performs cell (re)selection based on traditional methods without location-aware prioritization, then the selection process is simple, but the network selection efficiency and coverage performance deteriorate in NTN environments
Solution Approach 1:
The network provides configuration information to the WTRU in advance, including location information associated with TN coverage areas and frequency information for both TN and NTN. This preliminary provision of data enables the WTRU to perform location-aware cell (re)selection prioritization without complex real-time calculations, thereby improving network selection efficiency while maintaining manageable device complexity
Solution Approach 2:
The patent introduces configuration information as an intermediary element that carries location information and frequency information from the network to the WTRU. This intermediary data structure enables the WTRU to determine its location relative to TN coverage areas and perform prioritized cell (re)selection without requiring complex direct communication or calculation between the WTRU and network elements
2Reliability
If a WTRU uses location-based network selection with distance threshold comparison, then the coverage and performance in NTN improve, but the measurement and determination complexity increases
Solution Approach 1:
The configuration information serves as an intermediary that pre-processes location data from the network perspective. The network calculates and provides location information associated with TN coverage areas, freeing the WTRU from performing complex location determination while still enabling accurate location-based network selection through simple comparison operations
Solution Approach 2:
The WTRU autonomously performs cell (re)selection prioritization using the configuration information it receives. The WTRU independently determines its location relative to TN coverage areas, compares distances to thresholds, and selects the appropriate network type without requiring continuous network control or complex coordination, thereby improving reliability while managing measurement complexity
Data Source
AI summary
Systems, methods, and instrumentalities are described herein for enhanced cell (re)selection prioritization in non-terrestrial networks (NTNs). Cell (re)selection may be determined for terrestrial networks (TNs) and NTNs. Cell (re)selection may be determined for TNs or NTNs based on a wireless transmit/receive unit (WTRU) location and the coverage area associated with the TN or NTN. For example, a WTRU may be connected to a first network and perform (re)selection to a second network based on being outside a coverage area associated with the first network. The WTRU may prioritize a network type, for example, if it is within a coverage area of multiple networks.