E911-Specific Retry Timers for VoLTE Emergency Call Handling
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Solution Overview
Problem
Current VoLTE networks rely on generic SIP timers for all calls, which can lead to prolonged waiting periods for emergency and time-sensitive calls, as these timers are not optimized for E911 communications, resulting in inefficient call handling and potential delays in critical situations.
Innovation Solution
Implementing E911-specific timers within the VoLTE network to govern emergency call retransmissions, allowing for quicker completion of E911 calls by setting retry timers specific to emergency call scenarios, enabling network operators and users to control call provisioning sessions effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If generic SIP timers are used for all calls in VoLTE networks, then device complexity is reduced and ease of operation is improved, but call handling time increases and productivity deteriorates for emergency calls
Solution Approach 1:
The patent segments the timer configuration by call type, implementing E911-specific timers for emergency calls while maintaining generic SIP timers for non-emergency calls. This segmentation allows optimized timing for critical calls without affecting other call types, resolving the contradiction between reduced time loss and increased complexity.
Solution Approach 2:
The patent applies local quality by configuring different timer parameters specifically for E911 calls at the network node level. Instead of uniformly changing all timers, the invention selectively modifies timer behavior only for emergency call scenarios, achieving faster emergency call handling while maintaining simplicity for regular calls.
2Speed
If E911-specific timers are implemented to reduce waiting periods, then call completion speed is improved, but network configuration complexity increases
Solution Approach 1:
The patent implements dynamic timer configuration where E911-specific timers are activated conditionally based on call type identification. The network nodes dynamically select appropriate timer values based on whether a call is identified as an emergency call, achieving fast call completion for E911 while avoiding permanent configuration complexity for all calls.
Solution Approach 2:
The patent changes timer parameters specifically for E911 calls by configuring shorter retry intervals and timeout values for emergency scenarios. This parameter change approach allows the system to optimize call completion speed for emergencies by adjusting timing parameters without fundamentally altering the overall network architecture.
3Reliability
If longer timer values are used for reliable call provisioning, then call reliability is improved, but time loss increases for emergency calls
Solution Approach 1:
The patent segments reliability requirements by implementing E911-specific timer values that provide optimized reliability for emergency calls. By separating emergency call handling from regular call handling, the system can use shorter, faster timers for E911 calls while maintaining the proven reliability of longer timers for non-emergency calls through the same segmentation approach.
Data Source
AI summary
Systems and methods are described herein for handling E911 communications within IMS networks, such as Voice over LTE (VoLTE) networks. In some embodiments, the systems and methods, via various communication nodes, handle or otherwise govern emergency calls within the VoLTE network, by sending an INVITE message from a sender node of the VoLTE network to a recipient node of the VoLTE network, and starting a retry timer at the sender node that is specific to handling E911 calls by the VoLTE network.