NTN-TN Handover Control Using Service-Based Switching Conditions
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Solution Overview
Problem
Existing handover mechanisms in non-terrestrial networks (NTN) and terrestrial networks (TN) do not adequately consider service-based requirements, leading to inefficient switching between these networks.
Innovation Solution
A UE and BS are equipped with a baseband processor to determine and implement service-based handover conditions, considering factors like quality of service (QoS), latency, data rate, and data amount to switch between NTN and TN cells.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If measurement-based handover condition is used for switching between NTN and TN cells, then handover triggering is simple, but service requirements (QoS, latency, data rate) are not considered leading to inefficient switching
Solution Approach 1:
The patent introduces service-based parameters (QoS requirements, latency thresholds, data rate requirements, data amount thresholds) to complement or replace traditional measurement-based handover conditions. This changes the decision parameters from simple signal strength measurements to multi-dimensional service requirements, enabling efficient network switching that considers actual service needs.
2Area of stationary object
If NTN cell provides wider coverage, then area coverage is improved, but service quality (latency, data rate) may deteriorate compared to TN cell
Solution Approach 1:
The patent implements dynamic switching between NTN and TN cells based on real-time service requirements. When high data rate or low latency is required, the system dynamically switches to TN cells even if NTN provides wider coverage. This dynamic adaptation allows the system to optimize between coverage area and service quality based on current needs.
Solution Approach 2:
The patent applies different network types (NTN or TN) to different service requirements locally. Instead of using a uniform network type across all scenarios, the system selects NTN or TN based on specific service needs such as data rate, latency, and QoS requirements, providing locally optimized quality for each service context.
3Device complexity
If handover condition does not consider NTN/TN characteristics, then handover decision is simple, but service continuity and quality cannot be guaranteed
Solution Approach 1:
The patent performs preliminary assessment of service requirements (QoS, latency, data rate) before making handover decisions. By evaluating service needs in advance and comparing them with NTN/TN characteristics, the system ensures that handover decisions maintain service continuity and quality while keeping the decision process structured and manageable.
Data Source
AI summary
Example embodiments of the present disclosure relate to a UE and a BS for a solution of switching between a non-terrestrial network and a terrestrial network. A UE determines whether a service based handover condition is met; and switches from a first cell to a second cell if the service based handover condition is met, where the first cell is one of an NTN cell and a TN cell, the second cell is the other of the NTN cell and the TN cell. As such, a service requirement may be considered while switching, and thus the service at the UE may be guaranteed.