5G MPS On-Demand Signaling for End-to-End Priority Access
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Solution Overview
Problem
In emergency situations, on-demand multimedia priority service users with non-subscribed user equipment face challenges in receiving end-to-end prioritization due to lack of explicit communication of their authorized status to 5G network functions, leading to loss of radio connection and inability to request priority access during network congestion.
Innovation Solution
A method is disclosed to propagate an MPS On-Demand indication through the Policy Control Function to Session Management and Access and Mobility Management Functions, enabling them to upgrade user equipment for multimedia priority services, ensuring end-to-end prioritization by sending an MPS indicator in downlink NAS messaging.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a non-MPS subscribed device is used by an authorized MPS user during an emergency situation, then the user can access the network using public UE, but the device is unaware of its upgraded status and cannot request priority access during network congestion
Solution Approach 1:
The system performs preliminary action by sending an MPS indicator to the UE in downlink NAS messaging before the UE may need to request priority access. This indicator informs the UE of its upgraded status in advance, so when radio connection is lost and re-establishment is needed, the UE can immediately request priority access without needing to be aware of the complex authorization process that already occurred
Solution Approach 2:
The AMF acts as an intermediary by sending the MPS indicator through downlink NAS messaging to bridge the gap between the network's knowledge of the user's authorized status and the UE's need to know this status to request priority access. This intermediary communication ensures the UE has the necessary information to reliably request priority access during network congestion
2Reliability
If the AMF sends MPS indicator to UE in downlink NAS messaging, then the UE can use MPS access identity for priority access, but this requires additional signaling overhead
Solution Approach 1:
The downlink NAS messaging mechanism is used for multiple purposes: it not only delivers mobility management and session management information but also conveys the MPS indicator to inform the UE of its upgraded status. By making this existing signaling pathway multi-functional, the patent avoids creating entirely new signaling procedures, thereby reducing overall system complexity while achieving end-to-end priority treatment reliability
Data Source
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AI summary
A method for facilitating an on-demand multimedia priority service (MPS) for a data transport services (DTS) session to receive end to end prioritization within 5G Core (5GC) and radio access network (RAN) is provided. The method includes: propagating an MPS On-Demand indication to 5GC network functions and RAN via (a) Policy Control Function sending an MPS On-Demand indication to Session Management Function (SMF) when a authorized user initiates such a service usage, (b) SMF recording the on session demand status and sending the MPS On-Demand indication to an Access and Mobility Management Function (AMF), and (c) AMF, in response to receiving the MPS On-Demand indication, upgrading the user for multimedia priority services in the 5G core based on policy, and sending to user equipment (UE), an MPS indicator in downlink Non-Access Stratum (NAS) messaging to indicate that the UE may use MPS access identity to receive radio access prioritization.