User Plane Gateway Bypass for IMS Session Reliability
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Solution Overview
Problem
In communication systems, when a fault occurs in a data center, the policy control device becomes overwhelmed as multiple terminals attempt to set up IMS default bearers, leading to failure in establishing a mapping relationship between IP addresses and control plane gateways, thereby preventing normal IMS sessions between terminals.
Innovation Solution
The user plane gateway determines whether the control plane gateway bypasses the policy control device during the IMS default bearer setup and sends indication information to request the control plane gateway to establish a mapping relationship directly with the policy control device, allowing for normal IMS session establishment between terminals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple terminals initiate attachment and set up IMS default bearers in batches when a data center fault occurs, then the system attempts to restore service for all terminals, but the policy control device becomes overwhelmed and cannot establish mapping relationships
Solution Approach 1:
The patent segments the service restoration process by allowing control plane gateways to independently establish mapping relationships for their respective terminals without requiring sequential processing through the policy control device. This divides the monolithic restoration task into parallel independent operations, preventing the policy control device from being overwhelmed while maintaining comprehensive service restoration.
2Productivity
If the control plane gateway bypasses the policy control device during IMS default bearer setup, then the mapping relationship can be established quickly, but the policy control device cannot maintain proper mapping relationships for IMS sessions
Solution Approach 1:
The patent introduces the user plane gateway as an intermediary that maintains the mapping relationship between terminal IP addresses and control plane gateway identifiers. When the control plane gateway bypasses the policy control device, the user plane gateway stores this mapping information and uses it to forward session requests to the appropriate control plane gateway, ensuring both fast setup and reliable mapping maintenance.
3Ease of operation
If the policy control device processes all IMS default bearer setup requests, then centralized control is maintained, but the device becomes overwhelmed and cannot normally set up mapping relationships
Solution Approach 1:
The patent implements preliminary action by having control plane gateways pre-establish mapping relationships with terminals directly during the IMS default bearer setup process, before involving the policy control device for session management. This preliminary mapping establishment distributes the processing load and prevents the policy control device from becoming a bottleneck, while centralized control is maintained for subsequent session operations.
Data Source
AI summary
A communication method comprises that if a policy control device does not support setup of an Internet Protocol (IP) multimedia subsystem (IMS) default bearer during setup of an IMS default bearer for a terminal, the control plane gateway sends second indication information to a user plane gateway, where the second indication information indicates the control plane gateway bypasses the policy control device. When the user plane gateway receives an IMS session request from the terminal and determines that the control plane gateway bypasses the policy control device, the user plane gateway sends first indication information to the control plane gateway, and the first indication information indicates the control plane gateway to send, to the policy control device, a first request to request to establish a mapping relationship between the terminal and the control plane gateway such that an IMS session can be set up between terminals.