PDN GW Authorization Indication for Roaming VoLTE
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Solution Overview
Problem
In cellular networks, roaming user equipment (UE) may experience issues with Voice over IMS (VoLTE) services due to incorrect PDN GW selection, leading to unnecessary PDN connections and failed VoLTE sessions, as the current systems lack clear indications for authorized PDN GW selection between the home and visited PLMNs.
Innovation Solution
A method is introduced where a H-PLMN-allowed indication is provided to indicate whether a PDN GW in the home PLMN is authorized for service execution, and this indication is used to inform the UE about the expected success of the service, ensuring correct PDN GW selection and preventing unnecessary connections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the control node selects a PDN GW without clear authorization indication, then the UE can establish PDN connection, but unnecessary PDN connections are created and VoLTE sessions fail
Solution Approach 1:
The H-PLMN provides authorization indication to the UE in advance before the UE attempts to establish PDN connection for VoLTE service. This preliminary information allows the UE to make informed decisions about connection establishment, avoiding unnecessary connections and ensuring reliable service execution.
Solution Approach 2:
The system implements feedback mechanism where the H-PLMN sends authorization indication back to the UE regarding PDN GW selection. This feedback loop enables the UE to adjust its connection establishment behavior based on network authorization status, preventing unnecessary connections and ensuring service reliability.
2Ease of operation
If the control node selects PDN GW in V-PLMN without proper indication, then connection establishment is simplified, but service execution fails due to lack of authorization
Solution Approach 1:
The authorization indication acts as an intermediary information element that bridges the control node's PDN GW selection and the actual service execution. This intermediary provides the necessary authorization context without complicating the selection process, ensuring both ease of operation and service reliability.
3Measurement precision
If the system provides detailed authorization indication, then PDN GW selection accuracy improves, but system complexity increases
Solution Approach 1:
The system changes the parameter of authorization indication from implicit to explicit, providing clear binary authorization status (authorized/not authorized) for PDN GW selection. This parameter change improves selection accuracy without significantly increasing system complexity, as it involves adding a straightforward indication mechanism rather than complex decision logic.
Data Source
AI summary
A method of providing a service to a user equipment (UE) via a packet data network gateway (PDN GW), wherein the UE is served by a visited public land mobile network (V-PLMN) and wherein the UE has a subscription with a home public land mobile network (H-PLMN) comprising the steps of: providing, by a register in the H-PLMN, a H-PLMN-allowed indication, indicating whether a PDN GW in the H-PLMN is authorized to be selected for the UE for execution of the service, and providing, based on the H-PLMN-allowed indication, an indication to the UE, whether the UE can expect successful execution of the service.