NG-RAN Multicast Context Release After 5GS-to-EPS Mobility
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In existing 5G communication systems, when a user equipment (UE) moves from a 5G system to an Evolved Packet System (EPS), the 5G core network and base station continue to perform unnecessary operations for multicast communication, such as receiving multicast traffic, despite the UE no longer engaging in multicast sessions.
Innovation Solution
Implement a method where the NG-RAN node receives a UE context release command message, determines the UE's movement from 5GS to EPS, and removes multicast session information, and the AMF transmits a UE context release command to the NG-RAN node, facilitating the release of multicast distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the 5G core network and base station continue to maintain multicast context for UE after UE moves to EPS, then service continuity is ensured, but unnecessary operations and resource consumption occur
Solution Approach 1:
The AMF performs preliminary action by determining UE's movement to EPS before the NG-RAN node processes the context release. This early detection allows the system to proactively remove multicast context and stop traffic reception, preventing unnecessary operations while ensuring service continuity through coordinated interworking between 5GS and EPS
2Reliability
If the base station continues to receive multicast traffic from UPF for UE that has moved to EPS, then multicast service availability is maintained, but network resource utilization deteriorates
Solution Approach 1:
The system implements feedback mechanism where the AMF monitors UE context release commands and provides feedback information about UE's network movement status to the NG-RAN node. This feedback loop enables the base station to adjust its multicast traffic reception behavior dynamically, stopping unnecessary traffic reception when UE moves to EPS while maintaining service availability through coordinated multihoming
3Ease of operation
If multicast context is not removed after UE moves to EPS, then seamless handover is achieved, but system complexity increases due to dual context maintenance
Solution Approach 1:
The invention extracts and removes the multicast context from the 5G core network and NG-RAN node when UE moves to EPS. By taking out the unnecessary context information and stopping multicast traffic reception, the system simplifies context management while maintaining seamless handover capability through coordinated interworking procedures between 5GS and EPS
Data Source
AI summary
Provided in one embodiment of the present specification is a method by which an NG-RAN node performs communication related to a multicast. The method may comprise the steps of: receiving, from an AMF, a UE context release command message related to a first UE; determining that the first UE moves from a 5GS to an EPS, on the basis of the reception of the UE context release command message; and removing, from a context related to a multicast session, information related to the first UE.