NG-CU Call Migration via Preference-Based VNFC Selection
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Solution Overview
Problem
Conventional systems for call service selection and migration in Next Generation Central Unit (NG-CU) over Next Generation Radio Access Networks (NGRAN) are inefficient in handling overload conditions, leading to degradation of end-user experience due to inability to perform seamless call migration within multiple Virtual Network Function Components (VNFCs).
Innovation Solution
A method for call selection and migration in NG-CU over NGRAN, where a call initiated by a user is assigned to a source user plane VNFC, with a management VNFC detecting overload conditions and selecting calls with higher migration preference values to migrate to another VNFC using GTP tunnels, ensuring minimal impact on Quality of Experience (QoE) by considering QoS parameters and data rates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If calls are assigned to VNFCs in NG-CU without migration capability, then system simplicity is maintained, but call handling efficiency deteriorates during overload conditions
Solution Approach 1:
The system dynamically selects calls for migration based on migration preference values calculated from QoS parameters and data rates. During overload conditions, the source VNFC identifies and migrates specific calls to target VNFCs rather than handling all calls uniformly, enabling adaptive load distribution that improves productivity while maintaining controlled complexity through selective migration
Solution Approach 2:
The call handling function is segmented between source VNFCs that detect overload and initiate migration, and target VNFCs that receive migrated calls. This segmentation allows the system to distribute call processing across multiple VNFCs during overload conditions, improving overall call handling efficiency while maintaining clear functional boundaries that manage system complexity
2Reliability
If call migration is implemented without preference-based selection, then migration capability is provided, but Quality of Experience deteriorates due to arbitrary call selection
Solution Approach 1:
The system calculates migration preference values by changing parameters such as QoS requirements and data rates of calls. Calls with higher migration preference values (indicating lower sensitivity to migration) are selected for migration, ensuring that Quality of Experience is maintained. This parameter-based selection approach provides systematic call selection that balances reliability with operational simplicity
Solution Approach 2:
The source VNFC autonomously evaluates calls and selects which ones to migrate based on their own assessment of migration preference values derived from QoS parameters. This self-service mechanism enables intelligent call selection without requiring complex external control, maintaining high Quality of Experience while simplifying the operational complexity of call migration management
3Reliability
If overload detection is not implemented, then system operation is simple, but call service quality deteriorates during high traffic conditions
Solution Approach 1:
The source VNFC continuously monitors traffic load and detects overload conditions through feedback mechanisms. When overload is detected, the system triggers call migration procedures to redistribute calls and restore service quality. This feedback-based overload detection ensures call service quality is maintained during high traffic conditions while using straightforward monitoring that avoids excessive complexity
Data Source
AI summary
A system and method for call selection and migration in a NG-CU over NGRAN is disclosed. The system and method comprises a CP VNFC assigning a call initiated by a user to a source user plane VNFC. A management VNFC detects an overload traffic condition upon receiving the assigned call by the source user plane VNFC from the CP VNFC. The source user plane VNFC selects the call to be migrated with a higher migration preference value to another VNFC and signals CP VNFC to initiate call migration. The CP VNFC then migrates the selected call through at least one GTP tunnel to a target user plane VNFC. The source user plane VNFC then forwards the target user plane VNFC a request to handle complete trafficking of the migrated call.