PFCP Interface Reporting for CP Control in Separated BNG

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Solution Overview

Problem

The CP device in a BNG with CU separation architecture lacks interface information about the UP device, limiting its functionality, such as controlling access subscribers and managing network services effectively.

Innovation Solution

The UP device generates a PFCP message containing interface information, including indices and types, which it sends to the CP device, enabling the CP device to manage interfaces and perform functions like subscriber authentication and bandwidth control.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If the BNG adopts a CU separation architecture with CP device and UP device, then the system can perform forwarding processing and control plane functions, but the CP device cannot obtain interface information of the UP device, limiting its functionality

Engineering Contradiction:

Improvefunctionality of CP deviceVSAvoidinterface information of UP device

Core Design Contradiction:

Adaptability or versatilityVSLoss of information

Solution Approach 1:

The UP device actively reports interface information to the CP device through PFCP messages, creating a feedback mechanism that allows the CP device to obtain necessary interface information without direct access, thus resolving the information loss problem while maintaining architectural separation

Inventive Principle:

Principle #23Feedback

Solution Approach 2:

The PFCP message serves as an intermediary carrier that transfers interface information from the UP device to the CP device, enabling communication and information exchange between the two separated plane devices without requiring direct access to the UP device's interface

Inventive Principle:

Principle #24Intermediary (Mediator)

2Ease of operation

If the CP device lacks interface information, then the CU separation architecture is maintained, but the CP device cannot control access subscribers or perform network service management

Engineering Contradiction:

Improvesubscriber control capabilityVSAvoidinterface information

Core Design Contradiction:

Ease of operationVSLoss of information

Solution Approach 1:

The UP device provides feedback to the CP device by reporting interface information through PFCP messages, enabling the CP device to gain the necessary information to control access subscribers and manage network services while preserving the CU separation architecture

Inventive Principle:

Principle #23Feedback

Data Source

PatentUS12526221B2Communication method, UP device, and CP device

Publication Date: 2026.01.13 HUAWEI TECH CO LTD

AI summary

This application provides a communication method, a UP device, and a CP device, and pertains to the field of communications technologies. In the method, the UP device reports interface information to the CP device by using PFCP. Specifically, the UP device carries the interface information in a PFCP message, and transmits the PFCP message to the CP device. The CP device can obtain the interface information of the UP device from the PFCP message, which ensures that the CP device can sense the interface information of the UP device.