Multi-Access PDN Connectivity Control via NBIFOM Mode Signaling
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Solution Overview
Problem
The detailed procedures for establishing a multi-access PDN connection, including successful and failure scenarios, are not stipulated for Network-based IP Flow Mobility (NBIFOM), particularly in terms of acceptance and rejection mechanisms from a network perspective for terminal devices supporting NBIFOM functions.
Innovation Solution
A terminal device and Trusted WLAN Access Gateway (TWAG) include IP mobile communication network interfaces to transmit and receive messages indicating NBIFOM mode, enabling a communication control procedure for multi-access PDN connectivity establishment, with specific messages like Packet Data Network (PDN) Connectivity Accept and authentication responses facilitating the process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If NBIFOM function is supported by terminal device, then multi-access PDN connection capability is improved, but detailed acceptance and rejection procedures are not clarified
Solution Approach 1:
The patent applies preliminary action by including NBIFOM mode information in advance during the PDN connectivity establishment procedure. The network device includes NBIFOM mode information in the PDN Connectivity Accept message before the terminal device actually establishes the multi-access PDN connection, allowing the terminal to prepare appropriate handling procedures in advance. This resolves the contradiction by providing procedure clarity through preemptive information delivery.
Solution Approach 2:
The patent implements feedback by establishing a bidirectional information exchange mechanism where the network device sends NBIFOM mode information to the terminal device, and the terminal device can subsequently provide feedback messages indicating its NBIFOM support status and operational mode. This feedback loop clarifies the acceptance and rejection procedures by making the interaction transparent and structured.
2Productivity
If communication control procedure is implemented, then multi-access PDN connectivity establishment is improved, but message standardization complexity increases
Solution Approach 1:
The patent applies universality by designing a multi-functional message structure where the PDN Connectivity Accept message serves multiple purposes: it confirms PDN connection establishment, conveys NBIFOM mode information, and enables subsequent communication control procedures. This single message performs multiple functions, improving productivity without proportionally increasing message standardization complexity.
Solution Approach 2:
The patent uses parameter changes by introducing NBIFOM mode as an additional information parameter within existing message frameworks. Rather than creating entirely new complex message structures, the solution adds specific parameters (NBIFOM mode information) to conventional messages, enabling enhanced functionality with minimal increase in overall message standardization complexity.
Data Source
AI summary
Provided are a communications control method, etc., for multi-access PDN connection establishment requests from terminal devices. Provided is communication control accompanied with establishment of a multi-access PDN connection or with rejection of establishment of a multi-access PDN connection, based on a response to a PDN connectivity establishment request from a terminal device.