PCRF Default Access Determination for Multi-Access PDN Connectivity
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Solution Overview
Problem
The detailed procedure for establishing a multi-access PDN connection in the Network-based IP flow Mobility (NBIFOM) is not stipulated, and the means for a network to accept a request for establishing such a connection from a terminal device supporting NBIFOM functions are not clarified.
Innovation Solution
The Policy and Charging Rules Function (PCRF) plays a crucial role in determining the default access for establishing a multi-access PDN connection, enabling communication control procedures in response to connectivity requests from terminal devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If NBIFOM function is implemented to allow simultaneous utilization of 3GPP and non-3GPP interfaces, then communication versatility is improved, but the complexity of establishing multi-access PDN connection increases due to lack of detailed procedures
Solution Approach 1:
The terminal device performs preliminary actions by determining its own default access (3GPP or non-3GPP) before establishing the multi-access PDN connection. This preliminary determination simplifies the overall connection establishment process by pre-resolving the default access selection, eliminating the need for complex runtime negotiation procedures.
Solution Approach 2:
The patent introduces an intermediary mechanism where the terminal device's predetermined default access determination acts as a mediator between the 3GPP and non-3GPP access networks. This intermediary decision simplifies the interaction between network elements by providing a clear default access designation upfront, reducing the complexity of coordination required during connection establishment.
2Adaptability or versatility
If default access determination procedure is not standardized, then flexibility in implementation is improved, but communication control reliability deteriorates due to unclear network acceptance procedures
Solution Approach 1:
The patent changes the parameter of default access determination from a network-side decision to a terminal-side predetermined decision. This parameter change improves reliability by establishing a clear, standardized procedure where the terminal device determines its default access before connection establishment, providing a reliable basis for network acceptance procedures.
3Ease of manufacture
If multi-access PDN connection establishment procedure is not detailed, then ease of deployment is improved, but measurement precision of communication control deteriorates
Solution Approach 1:
The patent segments the default access determination process into a distinct preliminary step performed by the terminal device before PDN connection establishment. This segmentation provides precise measurement and control of the default access parameter, improving communication control precision while maintaining deployment ease through clear procedural separation.
Data Source
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AI summary
A method of communication control and the like accompanied with a multi-access PDN connectivity establishment request from a terminal device. Communication control for establishing a multi-access PDN connection is performed based on a response to a PDN connectivity establishment request from the terminal device. Communication control is performed for transmitting and/or receiving user data by using one or more default bearers for a multi-access PDN connection.