Fallback Mechanism for 5G Voice Call Setup Failure
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Solution Overview
Problem
5G voice calls often result in poor user experiences due to failed Quality of Service (QoS) flows, leading to issues like mute calls or dropped calls when a dedicated QoS flow cannot be established, as existing technologies lack effective fallback mechanisms to switch to alternative networks.
Innovation Solution
A fallback mechanism is implemented where a server computing device detects a failure to establish a 5G voice call and sends an indication to a mobile computing device to re-attempt the call via a different network, such as 4G, using timers or explicit indications to determine the failure and initiate the fallback.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If 5G network is used for voice calls, then higher speed and lower latency are achieved, but call establishment reliability deteriorates due to QoS flow failures
Solution Approach 1:
The system dynamically switches between 5G and 4G networks based on real-time call establishment success. When 5G call setup fails, the system automatically transitions to 4G network, making the network selection dynamic rather than static to resolve the contradiction between speed and reliability.
Solution Approach 2:
The system changes the network parameter (from 5G to 4G) when call establishment fails. By modifying the network generation parameter based on establishment success, the system maintains reliability while having access to higher speed 5G when conditions permit.
2Reliability
If dedicated QoS flow is established for 5G voice calls, then call quality is improved, but system complexity increases due to fallback mechanism requirements
Solution Approach 1:
The system performs self-service by automatically detecting call establishment failures and initiating fallback to 4G network without requiring complex external control mechanisms. The mobile device itself monitors and executes the fallback, reducing overall system complexity.
Solution Approach 2:
The system uses feedback from call establishment results to trigger appropriate actions. When establishment fails, the feedback loop initiates the fallback to 4G network, creating a simple closed-loop control system that maintains call quality without excessive complexity.
3Reliability
If fallback to 4G network is implemented, then call establishment reliability is improved, but transmission speed decreases
Solution Approach 1:
The system dynamically selects network based on establishment success rather than permanently settling for 4G. This dynamic approach ensures reliability through fallback while preserving the opportunity to use faster 5G when conditions allow, thus mitigating the speed reduction.
Solution Approach 2:
The system prepares fallback capability in advance by maintaining ability to switch to 4G network. This preliminary preparation ensures that when 5G establishment fails, the transition to 4G can occur immediately, maintaining reliability without permanent speed sacrifice.
Data Source
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AI summary
A fallback mechanism for managing voice over fifth generation (5G) communications is described. In an example, server computing device(s) associated with a 5G network can receive, from a mobile computing device, a request to initiate a voice call over the 5G network. The server computing device(s) can detect a failure to establish the voice call via the 5G network and responsive to detecting the failure to establish the voice call via the 5G network, the server computing device(s) can send, to the mobile computing device, an indication that the voice call failed. The indication can include an instruction to re-attempt to establish the voice call via a different network, and the instruction can cause the mobile computing device to re-attempt, in association with the request, to establish the voice call via the different network.