Emergency Network Fallback for Faster UE Service Registration
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Solution Overview
Problem
Existing emergency service systems in UE devices face delays due to the expiration of timer T3517, which can cause a 15-second delay in emergency calls when network response failures occur.
Innovation Solution
The electronic device initiates system fallback to a second communication system upon identifying an emergency event and starts a timer with an expiration time shorter than T3517, searches for and selects a cell from a different PLMN, and registers in that system to perform the emergency service.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the UE waits for timer T3517 to expire before initiating emergency service fallback, then the network can provide a response, but the emergency service activation is delayed by up to 15 seconds
Solution Approach 1:
The patent applies preliminary action by having the UE proactively search for and select a cell in a second communication system (EPS) before the timer T3517 expires. The UE prepares fallback resources in advance, including identifying suitable cells and initiating registration procedures, so that when the first communication system (5GS) fails to respond, the UE can immediately switch to the prepared fallback system without waiting for timer expiration.
Solution Approach 2:
The patent uses an intermediary approach by introducing a second communication system (EPS) as a backup pathway. When the primary 5GS network fails to respond, the UE can use this intermediary system to establish emergency service connectivity through a different network path, thereby resolving the deadlock caused by timer expiration.
2Adaptability or versatility
If the UE uses timer T3517 with a long expiration time, then the UE can wait for network response, but emergency calls are delayed by 15 seconds
Solution Approach 1:
The patent implements preliminary action by having the UE prepare fallback resources in advance. The UE searches for and selects suitable cells in the EPS system before the timer expires, and can initiate registration procedures early. This preparation allows the UE to quickly switch systems when needed, improving productivity without sacrificing adaptability to network conditions.
Solution Approach 2:
The patent applies dynamics by making the fallback mechanism flexible and adaptive. The UE can dynamically adjust its behavior based on timer status and network response conditions. When the timer expires or network response is unavailable, the UE can dynamically switch from waiting for 5GS response to immediately initiating EPS fallback, optimizing the balance between adaptability and response speed.
Data Source
AI summary
An example electronic device includes at least one processor, wherein the at least one processor can be configured to confirm an event associated with an emergency service while registered to a first communication system, transmit a service request, corresponding to the event, to a network on the basis of the confirmation of the event, start, on the basis of the transmission of the service request, a timer having an end time that is shorter than the end time of a T3517 timer, search for and select, on the basis of failing to receive a response corresponding to the service request until the timer ends, a cell corresponding to a PLMN of a second communication system that excludes the first communication system, perform at least one operation for registration to the second communication system on the basis of the selected cell, and perform the emergency service corresponding to the event in the second communication system on the basis of the registration to the second communication system.