5G MBS Handover via Policy Rule Acquisition
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Solution Overview
Problem
In 5G mobile telecommunication technology, user equipment (UE) experiences disruptions in multicast broadcast service (MBS) handover when moving from a base station supporting MBS to one that does not, as existing technologies struggle to maintain service continuity.
Innovation Solution
A method for implementing multicast broadcast service handover, which involves acquiring a PDU session associated with the MBS session, obtaining policy rule information from a Policy Control Function (PCF), and establishing a quality of service flow on the PDU session to ensure continuous MBS service.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If UE switches to unicast transmission mode when moving from MBS-supported base station to non-MBS base station, then service continuity is maintained, but transmission efficiency and resource utilization deteriorate
Solution Approach 1:
The patent introduces a session management function device as an intermediary that coordinates the handover process between base stations and UE. This mediator manages the transition from MBS to unicast mode, ensuring service continuity while optimizing resource allocation and transmission efficiency during the handover process.
Solution Approach 2:
The patent implements dynamic transmission mode switching, allowing the system to adapt between MBS and unicast modes based on the UE's location and network conditions. This dynamic adjustment ensures service continuity while optimizing energy efficiency and resource utilization according to real-time requirements.
2Reliability
If UE switches from MBS to unicast transmission mode during handover, then service continuity is ensured, but system complexity and handover procedure complexity increase
Solution Approach 1:
The session management function device is designed with multi-functionality, handling both MBS session management and unicast session management. This universal approach simplifies the handover procedure by using a single management entity that can handle both transmission modes, reducing overall system complexity while ensuring service continuity.
Solution Approach 2:
The session management function device acts as an intermediary that abstracts the complexity of mode switching from individual base stations and UE. This mediator coordinates the handover process, managing the transition between MBS and unicast modes centrally, thereby reducing distributed system complexity while maintaining service continuity.
3Ease of manufacture
If MBS service is discontinued at target base station, then resource allocation is simplified, but service quality and user experience deteriorate
Solution Approach 1:
The patent implements dynamic resource allocation that adapts to the target base station's capabilities. When MBS is not supported, the system dynamically switches to unicast mode with appropriate resource allocation, maintaining service quality while simplifying resource management at the target base station through flexible, condition-based allocation strategies.
Solution Approach 2:
The patent changes the transmission mode parameter from MBS to unicast when moving to a non-MBS base station. This parameter change allows the system to maintain service quality by adjusting the transmission characteristics appropriately for the target base station's capabilities, while simplifying resource allocation through the use of standard unicast resource management procedures.
Data Source
AI summary
A method for implementing multicast broadcast service handover includes: acquiring a protocol data unit (PDU) session associated with a multicast broadcast service (MBS) session, single network slice selection assistance information (S-NSSAI) of the PDU session being the same as S-NSSAI of the MBS session, a data network name (DNN) of the PDU session being the same as a DNN of the MBS session; acquiring an MBS session identity of the MBS session; acquiring policy rule information corresponding to the activated MBS session from a policy control function (PCF) according to the MBS session identity, one or more pieces of policy rule information being provided; and establishing a quality of service flow corresponding to the activated MBS session on the PDU session according to the policy rule information corresponding to the activated MBS session, one or more quality of service flows being provided.