Mobile-Terminating UE Fallback Networks for SIP Voice Recovery
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In wireless communication systems, particularly in 5G networks, mobile terminating user equipment (MT UE) experiences prolonged voice service disruptions due to SIP failure messages indicating network or global failures, leading to missed incoming calls without user awareness or the ability to re-dial the missed call number.
Innovation Solution
The MT UE is configured to maintain a hierarchy of fallback networks (e.g., LTE, Wi-Fi, 3G, 2G) and systematically attempts to connect to these networks upon receiving SIP failure messages, incrementing a counter to bar NR communication for increasing durations with each failure, ensuring continuous voice services.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If MT UE operates on NR network for 5G voice services, then network capacity and speed are improved, but service reliability deteriorates due to SIP failure messages causing prolonged disruptions
Solution Approach 1:
The UE is configured with a hierarchy of fallback networks (LTE, Wi-Fi, 3G, 2G) in advance before NR network failure occurs. When SIP failure messages are received indicating NR network issues, the UE can immediately switch to pre-configured fallback networks without delay, thus maintaining voice service reliability while operating on NR network for normal high-speed data services.
Solution Approach 2:
Fallback networks serve as intermediary systems between the NR network and the UE during network failures. When the primary NR network cannot deliver voice services due to SIP failures, the fallback networks act as mediators to maintain continuous voice service connectivity, resolving the contradiction between using NR for speed and ensuring reliability.
2Reliability
If UE maintains multiple fallback networks for redundancy, then service reliability is improved, but device complexity increases
Solution Approach 1:
The network hierarchy is segmented into multiple levels (NR network at top, followed by LTE, Wi-Fi, 3G, 2G fallback networks). Each network type is managed independently with specific connection parameters and protocols. This segmentation allows the UE to handle each network type separately rather than managing all networks as a single complex system, reducing overall management complexity while maintaining reliability through the segmented fallback structure.
Solution Approach 2:
The UE dynamically changes connection parameters (network type, frequency, authentication credentials) based on the current operational state and failure conditions. Instead of maintaining fixed complex configurations for all networks simultaneously, the UE adjusts parameters in real-time to activate only the necessary fallback networks when needed, simplifying device complexity while ensuring service continuity.
3Reliability
If UE systematically attempts to connect to fallback networks upon SIP failure, then service recovery time is improved, but loss of time increases due to network switching overhead
Solution Approach 1:
Fallback network connection parameters and authentication credentials are stored in advance in the UE's memory before network failures occur. When SIP failure messages are received, the UE can immediately initiate connection to pre-configured fallback networks without performing time-consuming configuration or authentication procedures during the switch, thus minimizing network switching time while ensuring rapid service recovery.
Solution Approach 2:
The UE implements a feedback mechanism that monitors SIP failure messages and automatically triggers fallback network connection attempts. This closed-loop feedback system detects network issues in real-time and initiates recovery actions immediately, reducing both the detection time and the overall service recovery time while minimizing manual intervention and unnecessary switching overhead.
Data Source
AI summary
An apparatus for wireless communication of a user equipment (UE) is disclosed. The apparatus may include a memory and at least one processor coupled to the memory. The at least one processor may be configured to receive a paging signal associated with an mobile terminating (MT) internet protocol (IP) multimedia subsystem (IMS) voice session. The at least one processor may be further configured to send a session initiation protocol (SIP) message in response to the paging signal. The at least one processor may be further configured to receive a second SIP message indicating SIP failure. The at least one processor may be further configured to determine whether the second SIP message indicates a network failure or a global failure. The at least one processor may be further configured to establish a connection with a different RAT network when the second SIP message indicates a network failure or a global failure.