Emergency Call Redirection in Femtocell Networks
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In wireless telecommunications, especially in femtocell environments, emergency calls may be unreliable due to limited resources and connectivity issues, leading to potential service failures and liability concerns for operators, with existing solutions not adequately addressing the need for guaranteed reliability and user experience consistency across different network access points.
Innovation Solution
The implementation of techniques that allow mobile devices to reselect to macro coverage when attempting emergency calls from femtocells, providing an Emergency Calls Supported Indicator (ECSI) to inform users of service limitations, and enabling the UE to autonomously switch to macro cells in case of femtocell congestion or service unavailability, ensuring reliable emergency call connectivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If H(e)NB is used to provide emergency services, then network resource utilization is improved, but service reliability deteriorates due to limited resources and connectivity issues
Solution Approach 1:
The patent segments emergency service support into two distinct paths: one for normal H(e)NB operation with limited resources, and another for emergency calls that may be redirected to macro cells. This segmentation allows the system to utilize H(e)NB resources for regular services while ensuring dedicated, reliable pathways for emergency communications, resolving the contradiction between resource utilization and reliability.
Solution Approach 2:
The patent introduces an intermediary mechanism in the form of a redirection system that mediates between H(e)NB and macro cell. When emergency services are needed, the system can redirect the UE from H(e)NB to macro cell, ensuring reliable emergency service while maintaining efficient H(e)NB resource utilization for non-emergency traffic.
2Adaptability or versatility
If H(e)NB supports emergency calls for CSG and non-CSG members, then service accessibility is improved, but connection stability deteriorates due to intentional or unintentional connection loss
Solution Approach 1:
The patent implements preliminary action by pre-establishing macro cell neighbors and redirection information in the H(e)NB before emergency calls are needed. This allows the system to quickly and reliably redirect UEs to stable macro cell connections when emergency services are required, maintaining both high accessibility and connection stability.
Solution Approach 2:
The patent provides beforehand cushioning by preparing alternative macro cell pathways in advance. When connection loss occurs or is anticipated in H(e)NB, the pre-configured redirection mechanisms ensure continuous emergency service access through stable macro cell connections, cushioning against connection instability.
3Adaptability or versatility
If UE camps on H(e)NB for emergency call, then service availability is improved, but service quality deteriorates due to femtocell congestion
Solution Approach 1:
The patent applies dynamics by implementing dynamic redirection capabilities that allow the system to adaptively switch between H(e)NB and macro cell based on real-time conditions. When femtocell congestion is detected or anticipated, the system dynamically redirects emergency calls to macro cells, maintaining both service availability and quality.
Data Source
Figure 1~3
Figure 4~5
Figure 6~8
AI summary
A user equipment (UE) including one or more processors configured to receive an emergency calls supported indicator (ECSI).