IMS Call Bearer Switching for Dedicated Bearer Failure
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Solution Overview
Problem
IMS call establishment in communication networks experiences delays, failures, or disconnections of the IMS dedicated bearer, leading to call termination and affecting user calls.
Innovation Solution
A method and system for detecting IMS dedicated bearer abnormalities, where a terminal sends signaling to a network server to initiate bearer switching from the dedicated bearer to a default bearer, involving a media server to ensure seamless transmission of IMS call data.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If IMS dedicated bearer is used for call data transmission, then call quality is improved, but bearer stability deteriorates due to abnormalities and disconnections
Solution Approach 1:
The terminal pre-configures an IMS default bearer as a backup transmission path before the dedicated bearer becomes abnormal. When bearer abnormality is detected, the system can immediately switch to the pre-prepared default bearer, cushioning against call interruption and maintaining service continuity.
Solution Approach 2:
The system dynamically changes the transmission parameter (bearer selection) from dedicated bearer to default bearer based on the abnormality detection result. This parameter change allows the system to adapt to the degraded network condition while maintaining call functionality.
2Reliability
If bearer switching is implemented to handle abnormalities, then call continuity is improved, but system complexity increases due to additional signaling and coordination
Solution Approach 1:
The terminal autonomously detects bearer abnormalities and initiates the switching process by sending indication information to the network device. This self-service approach reduces the need for complex network-side detection and control mechanisms, simplifying the overall system while maintaining reliability.
Solution Approach 2:
The system implements a feedback mechanism where the terminal monitors bearer status and provides feedback information to the network device. This feedback loop enables automatic triggering of the bearer switching process, reducing the need for manual intervention and complex control logic.
3Reliability
If abnormality detection and switching mechanism is added, then call smoothness is improved, but processing time increases due to detection and signaling overhead
Solution Approach 1:
The IMS default bearer is pre-established and configured before any abnormality occurs. This preliminary action ensures that when switching is needed, the alternative path is already ready, eliminating the time required for bearer setup during the switching process.
Solution Approach 2:
When bearer abnormality is detected, the system skips the normal bearer establishment procedures and directly switches to the pre-configured default bearer. This rushing through of the switching process minimizes the time loss associated with abnormality handling.
Data Source
AI summary
An IMS call establishment method includes: in a case that an IMS dedicated bearer is abnormal, sending, by a terminal, first signaling on an IMS default bearer to a network server, where the first signaling is used to notify that the IMS dedicated bearer is abnormal and to instruct the network server to send second signaling to a media server; receiving, by the terminal, first feedback signaling sent by the network server, where the first feedback signaling is used to notify that the media server has switched the bearer of the IMS call data from the IMS dedicated bearer to the IMS default bearer; and transmitting, by the terminal, the IMS call data on the IMS default bearer based on the first feedback signaling.