MME VOPS Indication for PGW Fault Handling
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Solution Overview
Problem
In LTE networks, when a packet data network gateway (PGW) is faulty, the existing mechanisms fail to ensure uninterrupted voice services, leading to connectivity issues for called parties due to the reliance on VoLTE, which cannot function properly without a functional PGW.
Innovation Solution
A method where the mobility management entity (MME) generates and sends voice over packet switch (VOPS) capability indication information to the home subscriber server (HSS) when a PGW is faulty, allowing the system to fallback to circuit switched fallback (CSFB) for voice services, ensuring continuous connectivity by indicating the network's inability to support VOPS.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the network side selects VoLTE for voice service when IMS registration is completed, then voice service quality is improved, but connectivity reliability deteriorates when PGW is faulty
Solution Approach 1:
The patent implements dynamic domain selection capability indication that allows the network to switch between VoLTE and CSFB modes based on real-time PGW status. The HSS dynamically updates the VOPS capability indication information in response to PGW fault conditions, enabling flexible adaptation between packet-switched and circuit-switched domains without requiring complex manual configuration changes.
Solution Approach 2:
The HSS acts as an intermediary between the PGW status monitoring and the domain selection decision-making process. It receives notifications about PGW faults, processes this information, and updates the VOPS capability indication accordingly, thereby mediating the transition from VoLTE to CSFB mode without requiring direct complex interactions between all network elements.
2Speed
If real-time domain selection data query is implemented, then service switching speed is improved, but signaling overhead increases
Solution Approach 1:
The system performs preliminary actions by having the HSS proactively query domain selection data and update VOPS capability indications when PGW fault conditions are detected. This preliminary update ensures that when a call attempt occurs, the network is already configured to use CSFB mode, avoiding the need for real-time switching during active call setup and reducing signaling overhead during normal operation.
Data Source
AI summary
The present invention discloses a called service processing method, a mobility management entity, and a home subscriber server. The method includes: generating, by an MME, VOPS capability indication information according to a faulty state of a PGW after determining that the PGW in which UE is located is faulty, where the VOPS capability indication information is used to indicate that a network in which the UE is located does not support VOPS; and sending, by the MME, the VOPS capability indication information to an HSS. According to the called service processing method, the mobility management entity, and the home subscriber server provided in embodiments of the present invention, a called service is not affected after a PGW is faulty.