Conditional Handover Profiles for Non-Terrestrial 5G Energy Saving
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Solution Overview
Problem
Existing 5G wireless communication systems face challenges in efficiently managing resource loads and optimizing energy usage for mobile devices with varying QoS demands, particularly in scenarios involving ultrareliable and low latency communications (URLLC) and enhanced mobile broadband (eMBB), where handover processes are not adequately addressed for non-terrestrial radio network nodes.
Innovation Solution
A method and system for conditional handover between terrestrial and non-terrestrial radio network nodes, involving energy parameter analysis, quality of service criteria, and conditional handover profiles to optimize energy savings and resource allocation, including the use of conditional handover commands and configuration information to facilitate seamless transitions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If handover processes are implemented in 5G wireless communication systems to manage resource loads and optimize energy usage, then energy efficiency and resource management are improved, but system complexity and handover decision-making complexity increase
Solution Approach 1:
The patent implements conditional handover by pre-configuring handover conditions and parameters before handover is needed. The source gNB provides the UE with conditional handover configuration information including target cell identifiers, handover conditions, and execution parameters in advance. When conditions are met, the UE can immediately execute handover without complex real-time decision-making, thus improving energy efficiency while managing complexity through advance preparation.
Solution Approach 2:
The handover process is segmented into distinct phases: configuration phase (source gNB provides conditional handover config), evaluation phase (UE monitors conditions), and execution phase (UE performs handover when conditions met). This segmentation allows each phase to be optimized independently, reducing overall system complexity while maintaining energy efficiency benefits.
2Reliability
If conditional handover configuration information is provided to user equipment to enable intelligent handover decisions, then handover reliability and quality of service are improved, but information processing requirements and device complexity increase
Solution Approach 1:
The source gNB pre-configures the UE with conditional handover configuration information including target cell identifiers, handover conditions (such as signal strength thresholds), and execution parameters before handover is needed. This preliminary provision of information allows the UE to make reliable handover decisions based on pre-defined criteria, improving handover reliability while reducing the complexity of real-time decision-making.
Solution Approach 2:
The UE is empowered to autonomously evaluate handover conditions and execute handover decisions based on pre-configured parameters without continuous network control. This self-service capability improves handover reliability by enabling timely decisions while reducing the processing burden on the network, effectively managing device complexity through autonomous operation.
3Area of stationary object
If non-terrestrial radio network nodes are used to provide wireless coverage, then coverage area and service availability are improved, but energy consumption and resource management challenges increase
Solution Approach 1:
The patent implements dynamic handover between terrestrial and non-terrestrial gNBs based on real-time conditions such as signal quality, load status, and energy consumption. The UE can be handed over from a non-terrestrial gNB (providing wide coverage) to a terrestrial gNB (consuming less energy for localized service) when appropriate, thus maintaining large coverage area while optimizing energy consumption through dynamic resource allocation.
Solution Approach 2:
The system changes operational parameters by selecting different gNB types (terrestrial vs. non-terrestrial) based on service requirements. Non-terrestrial gNBs are utilized when wide coverage is needed, while terrestrial gNBs are activated for energy-efficient localized service. This parameter change approach allows the system to balance coverage area and energy consumption by adapting to different operational scenarios.
Data Source
AI summary
A non-terrestrial radio network node may configure user equipment with conditional handover period information and conditional handover configuration information. During establishment of a connection to facilitate delivery of non-terrestrial traffic, the non-terrestrial node may configure a user equipment with an assigned conditional handover profile indication corresponding to the non-terrestrial traffic. Upon determining to suspend delivery of the non-terrestrial traffic during a network energy saving mode, the non-terrestrial node may transmit a conditional handover command, responsive to which the user equipment may determine, based on the assigned conditional handover profile indication and the conditional handover configuration information, a target terrestrial radio network node and may transmit a connection establishment request thereto. Responsive to a connection transfer request transmitted by the target terrestrial node, the non-terrestrial node may transmit session context information corresponding to the non-terrestrial traffic that the target node may use to facilitate delivery thereof during the conditional handover period.