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202623 https://hdl.handle.net/2286/R.2.N.202623 http://rightsstatements.org/vocab/InC/1.0/ All Rights Reserved 2025 2027-12-01T18:10:29 270 pages Doctoral Dissertation Academic theses en Thotton Veettil, Vinayak Kumar Reisslein, Martin Thyagaturu, Akhilesh Kim, Hokeun McGarry, Michael Arizona State University Partial requirement for: Ph.D., Arizona State University, 2025 Field of study: Electrical Engineering Emergency calls or emergency services, have access to a plurality of radio technologies over which they can be established. The types of services or options that can be offered over these emergency services to better serve the cause, such as location accuracy, optimizing the underlying radio link, functionalities such as messaging or video calling etc. are also being rolled out.This opens options on how the call is setup, that is, selecting the most optimal radio technology or a combination thereof using service aggregation and steering techniques such as multi-path transport technologies. The availability of such options enables optimization and deployment of policies that will best serve the person in emergency. This can be achieved by having a better power consumption optimization, hence prolonging the battery life of the user so they can stay in contact with the public safety entities for a long time in case of difficult to reach or rescue emergencies like natural calamities. Another consideration is the ability to move active calls by selecting routes with optimal service. Decisions are crafted based on resource availability and User Equipment (UE) capabilities. Resources like radio coverage, battery level, throughput, radio quality, etc. Hence there is a need for identifying metrics based on which an algorithm can be implemented for choosing the radio access technology, subscription, etc. for call establishment. The following broad considerations are studied and presented: 1. User Grouping: To showcase potential user grouping the key metric that was studied is battery consumption. Comparison of radio technologies and related power consumption, Location based service enablement or disablement techniques, Impact of bandwidth and impact of serving frequency band is considered. All data is collected using a multi-subscription UE. Route Selection. 2. Route selection is the other key aspect of utilizing the available radio access technologies. The ability to successfully transition during an active data call, showcasing a dynamic route selection based on policies defined is also studied and presented. Switching traffic without disconnecting the ongoing data traffic is studied and presented. Conclusions based on the experiments conducted present current options along with potential future study areas. Electrical Engineering Emergency Calls, Studying Metrics Definition for Call Type and Mode Selection