Multimode Device Domain Selection for Voice and SMS Services
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Solution Overview
Problem
Current wireless communication technologies, such as LTE, face challenges in efficiently selecting domains for voice and SMS services, particularly for multimode devices camping on packet switched radio access technology networks, as they often lack mechanisms to determine suitable domains based on device capabilities, operator preferences, and network conditions, leading to suboptimal service availability and quality.
Innovation Solution
A method and apparatus for determining the attach type and selecting appropriate domains for voice and SMS services by considering parameters like home network capabilities, operator preferences, and user settings, allowing devices to switch between different domains such as single carrier-circuit switched fall back (1xCSFB) and SMS over S102 interfaces, ensuring seamless service provision.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If a multimode device camps on a packet switched RAT network (LTE), then high-speed data services are improved, but voice and SMS service availability deteriorates due to lack of domain selection mechanisms
Solution Approach 1:
The patent implements dynamic domain selection mechanisms that allow the device to adaptively switch between different service domains (PS domain for data, CS domain for voice/SMS) based on real-time service requirements, device capabilities, and network conditions. This dynamic adaptation resolves the contradiction by enabling the device to maintain high-speed data services while ensuring reliable voice and SMS service availability through appropriate domain selection.
Solution Approach 2:
The patent segments the service delivery into different domains: packet switched domain for data services and circuit switched domain for voice and SMS services. By separating service delivery mechanisms into distinct domains with specific attachment types (EPS attach for data-only, combined attach for data and voice/SMS), the system enables simultaneous optimization of both high-speed data transmission and reliable voice/SMS service availability.
2Adaptability or versatility
If the device supports multiple attach types, then service versatility is improved, but device complexity increases
Solution Approach 1:
The patent implements self-service mechanisms where the device autonomously determines its service capabilities and selects appropriate attach types based on pre-configured device capability parameters. The device automatically evaluates whether it supports voice services, SMS services, or both, and accordingly selects EPS attach for data-only devices or combined attach for devices supporting voice and SMS, thereby reducing manual configuration complexity while maintaining service versatility.
Solution Approach 2:
The patent utilizes parameter-based attachment type determination where the device complexity is managed by changing key parameters (voice service capability, SMS service capability) that automatically trigger the selection of appropriate attach types. This parameter-driven approach simplifies device complexity by replacing complex decision logic with parameter-based selection, while still supporting multiple service types through different attach type configurations.
3Reliability
If the network provides domain selection mechanisms, then service quality is improved, but signaling overhead increases
Solution Approach 1:
The patent implements preliminary action by having the device determine and indicate its service capabilities (voice service support, SMS service support) during the initial attachment process. The network uses these pre-indicated capabilities to automatically determine the appropriate domain and attach type without requiring additional signaling exchanges. This preliminary indication mechanism improves service quality through accurate domain selection while minimizing signaling overhead by consolidating capability information in the initial attachment request.
Data Source
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AI summary
Certain aspects of the present disclosure propose a method for domain selection in a multimode UE. The domain selection method may be used to select domains for short message service (SMS) and/or voice service when the UE has camped on a packet switched (PS) network such as LTE. The proposed domain selection method may take into account UE capabilities, home operator preferences, visited operator preferences, visited network capabilities, and user settings.