ePDG Notifies PCRF of UE Location for BPCF Session Initiation
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Solution Overview
Problem
In the context of Fixed Mobile Convergence, the Fixed Network BPCF entity cannot initiate an S9* session to the PCRF entity due to the inability to perceive UE access through the fixed network, leading to incomplete information exchange and failed session establishment.
Innovation Solution
The ePDG notifies the PCRF entity of the UE's location information, which is then sent to the BPCF entity, establishing an IP-sec tunnel and initiating an IKEv2 verification to ensure secure and accurate transmission of UE identifier and tunnel information, enabling the BPCF entity to initiate an S9* session.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the BPCF entity attempts to initiate an S9* session to the PCRF entity, then session establishment is required for policy control, but the fixed network cannot perceive UE access through the fixed network, leading to failed session initiation
Solution Approach 1:
The ePDG acts as an intermediary between the fixed network and the PCRF entity. It receives location information from the UE during IKEv2 authentication and forwards this information to the PCRF entity, enabling the PCRF to subsequently initiate sessions with the BPCF entity. This mediator role resolves the information asymmetry problem where the fixed network otherwise cannot perceive UE access.
2Loss of information
If the ePDG notifies the PCRF entity of UE location information, then the fixed network can perceive UE access, but additional information exchange steps are required, increasing system complexity
Solution Approach 1:
The patent combines the location information notification with the existing IKEv2 authentication process. The ePDG notifies the PCRF entity of UE location information during the established IKEv2 tunnel setup, rather than as a separate procedure. This merging of functions reduces overall system complexity while ensuring information availability.
3Productivity
If the PCRF entity receives location information from ePDG and initiates S9* session to BPCF entity, then seamless data transmission is enabled, but the protocol interaction steps increase
Solution Approach 1:
The PCRF entity receives and processes the UE location information from the ePDG in advance, before the BPCF entity needs to initiate the S9* session. This preliminary action ensures that when the BPCF entity initiates the session, all necessary location information is already available at the PCRF, enabling seamless data transmission without delays caused by information retrieval during session establishment.
Data Source
AI summary
The present invention discloses a method and system for information transmission. Said method includes: an Evolved Packet Data Gateway (ePDG) notifying a Policy and Charging Rules Function (PCRF) entity of the location information of a User Equipment (UE); the PCRF entity sending the location information of the UE to a Broadband Policy Control Function (BPCF) entity. The method and system provided by the present invention solve the problem that the BPCF in a fixed network can not initiate an S9* session to the PCRF entity.