CP Device Switching via UP Feedback in Forwarding-Control Separation
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Solution Overview
Problem
The existing CP device switching methods in broadband remote access servers (BRAS) systems with forwarding-control separation deployment have low flexibility, leading to potential disruptions in user service processing due to degraded communication performance between the active CP device and UP devices.
Innovation Solution
A method where UP devices independently monitor communication performance with both the active and standby CP devices, sending a switching request to the standby CP device when the active CP device's communication degrades, and the standby CP device issues switching instructions based on a threshold of UP devices requesting the switch, ensuring reliable transitions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the standby CP device automatically replaces the active CP device based on fault detection, then system reliability is improved, but switching flexibility deteriorates
Solution Approach 1:
Instead of the standby CP device initiating the switch based on fault detection, the invention inverts the control direction by allowing UP devices to actively request switching to the standby CP device when they detect communication performance degradation with the active CP device. This inversion enables more flexible and adaptive switching decisions while maintaining system reliability.
Solution Approach 2:
The invention implements a feedback mechanism where UP devices continuously monitor communication performance with the active CP device and provide feedback through switching requests when degradation is detected. The standby CP device receives these feedback requests and executes switching based on the aggregated feedback from multiple UP devices, enabling adaptive and flexible system response to actual communication conditions.
2Speed
If the standby CP device monitors communication performance and automatically switches, then switching speed is improved, but system complexity increases
Solution Approach 1:
The invention extracts the performance monitoring function from the CP device and relocates it to the UP devices. UP devices now independently monitor communication performance with the active CP device and initiate switching requests when degradation is detected, eliminating the need for the standby CP device to perform complex monitoring while maintaining fast switching response.
Solution Approach 2:
UP devices perform self-monitoring of communication performance and autonomously generate switching requests when degradation is detected, without requiring the standby CP device to actively monitor or initiate the switching process. This self-service approach simplifies the standby CP device's functionality while maintaining rapid switching capability.
Data Source
AI summary
A control plane (CP) device switching method includes that when a user plane (UP) device in a forwarding-control separation system detects that performance of communication between the UP device and an active CP device does not meet a normal communication condition, and performance of communication between the UP device and a standby CP device meets the normal communication condition, the UP device sends a switching request to the standby CP device. When detecting that a quantity of UP devices that each send the switching request is greater than or equal to a first quantity threshold, the standby CP device may indicate each UP device in the forwarding-control separation system to switch to the standby CP device.