UE Network Selection for Voice Service Availability
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Solution Overview
Problem
User equipment (UE) with a 'voice centric' setting faces inefficiencies in network selection when voice services are not available, leading to unnecessary resource utilization and failed registration attempts on networks that do not support voice services over packet switching sessions.
Innovation Solution
The UE stores network identifications associated with access technologies where voice services are unavailable and selectively attempts registration on alternative networks with different access technologies, using timers to manage this information and reduce repetitive attempts on unsupported networks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the UE attempts to register with the same communication network associated with the same access technology again, then the registration process is repeated, but the same determination that voice service over PS session is not supported is obtained, thus utilizing network resources without resulting in successful registration
Solution Approach 1:
The UE performs preliminary action by storing the network identification and access technology combination in a list after detecting voice service unavailability. This preliminary recording prevents future repetitive registration attempts on the same network-access technology pair, thereby avoiding unnecessary network resource utilization while maintaining reliable voice service selection
Solution Approach 2:
The system implements feedback by using the stored list of networks with unavailable voice services to guide future network selection decisions. When the UE needs to select a network, it checks this feedback information to exclude networks known to not support voice services, thus preventing wasteful registration attempts and optimizing network resource usage
2Productivity
If the UE excludes networks with identified access technologies from selection, then registration attempts on unsupported networks are reduced, but the UE may miss potential networks that could support voice services if the stored information is inaccurate or outdated
Solution Approach 1:
The network selection process is made dynamic by allowing the UE to adapt its behavior based on the voice service availability status. When voice services are unavailable on a network-access technology pair, the UE dynamically excludes that combination from future selection. This dynamic adjustment optimizes productivity by avoiding known failures while maintaining adaptability to change when network conditions improve
Solution Approach 2:
The system changes the parameter of network selection by introducing a filter based on stored voice service availability information. The UE modifies its network selection parameters to exclude networks identified as not supporting voice services, thereby improving selection efficiency. This parameter change is reversible and adaptable when network conditions change, maintaining versatility
Data Source
AI summary
A user equipment (UE) having a usage setting set to voice centric that is configured to perform: sending a request to register the UE with a network associated with an access technology comprising one of terrestrial radio access network (RAN) and satellite-based RAN, receiving a response to the request and, based on information in the response, determining that a voice service of the network is not available; storing an identification of the network in association with an indication of the access technology associated with the network for which voice service of the network is not available, in information identifying networks with associated access technologies for which the voice service is not available; and selecting a candidate network for sending a further request to register the user equipment, the candidate network with associated access technology other than the networks with associated access technologies identified in the information stored.