UE Emergency Call Network Selection via Preliminary Action
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Solution Overview
Problem
User equipment (UE) devices in LTE and 5G networks face challenges in reliably making emergency calls due to variations in network capabilities, positioning services, and connectivity issues, which can lead to failed connections and inefficient fallback processes across different radio access technologies.
Innovation Solution
The UE device evaluates multiple factors such as network support for emergency calls, positioning services, call drop rates, and congestion to designate a primary network for emergency calls and automatically switches to alternative networks if the primary fails, ensuring connection to a Public Safety Answering Point (PSAP) through processes involving network attachment, call logic, and emergency call logic.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If UE devices use multiple network technologies (LTE and 5G) for emergency calls, then connectivity options and service availability are improved, but network selection complexity and fallback process complexity increase
Solution Approach 1:
The UE device performs preliminary actions by evaluating network capabilities, positioning services, and congestion levels before initiating an emergency call. The device determines a primary network and prepares fallback networks in advance, so that when an emergency call is needed, the selection and switching processes are already prepared, reducing real-time complexity while maintaining multiple connectivity options.
2Reliability
If the UE device automatically switches to alternative networks when the primary network fails, then call reliability is improved, but fallback process time and switching complexity increase
Solution Approach 1:
The UE device identifies and prepares alternative networks in advance by evaluating network capabilities and congestion levels. When primary network failure occurs, the device can immediately switch to pre-identified alternative networks, significantly reducing fallback time while maintaining high call reliability through automatic switching.
Solution Approach 2:
The UE device continuously monitors network conditions including congestion levels and call success rates. This feedback mechanism allows the device to dynamically adjust network selection and optimize fallback choices in real-time, ensuring the fastest and most reliable network transition when needed.
3Measurement precision
If the UE device evaluates multiple factors (network support, positioning services, call drop rates, congestion) for network selection, then location accuracy and call success are improved, but processing time and evaluation complexity increase
Solution Approach 1:
The UE device performs network capability evaluation and congestion level assessment in advance, before emergency calls are needed. By pre-determining network rankings and preparing location information, the device can quickly select optimal networks during actual emergency calls, maintaining high location accuracy and call success rates while minimizing processing time.
Data Source
AI summary
A device may connect to a first wireless network; determine whether the first wireless network provides a particular service for determining a position of the device; select the first wireless network as a primary network if the first wireless network provides the particular service for determining a position of the device, or select the second wireless network as the primary network if the first wireless network does not provide the particular service for determining a position of the device. If the device selects the first wireless network as the primary network, the device may send a first request to the first wireless network to make a first emergency call to an endpoint over the first wireless network.