Inter-RAT Service Handover for VoNR, SMS, and USSD Support
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Solution Overview
Problem
Existing 5G standalone (SA) networks face challenges in supporting newly requested services such as USSD or SMS, as they are unable to provide these services simultaneously with VoNR, necessitating a solution for seamless handover to compatible radio access technologies (RATs).
Innovation Solution
A method and apparatus that enable terminals to identify suitable RATs from a database, perform handover to these RATs, and transition services like VoNR to VoLTE or CS calls to support additional services like USSD or SMS by utilizing inter-RAT handover.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If 5G SA network is deployed to provide high data rates, then transmission distance and data rate are improved, but support for legacy services such as USSD and SMS is lost
Solution Approach 1:
The system dynamically switches between 5G SA and other RATs based on service requirements. The terminal autonomously determines when to use 5G for high-speed data and when to fallback to other RATs for legacy services, making the network adaptation dynamic rather than static
Solution Approach 2:
The patent introduces an intermediary mechanism where the terminal acts as a mediator between the 5G network and legacy services. When a legacy service is detected, the terminal initiates handover procedures to other RATs that can support these services, effectively mediating the incompatibility between 5G and legacy service requirements
2Adaptability or versatility
If terminal performs service selection manually, then service compatibility is improved, but user operation complexity increases
Solution Approach 1:
The terminal performs autonomous service selection and handover decisions without requiring manual user intervention. The device monitors available services, detects compatibility issues, and automatically executes handover procedures to appropriate RATs, making the system self-serving rather than requiring user guidance
Solution Approach 2:
The system continuously monitors service availability and terminal capabilities, using this feedback to make real-time decisions about service selection and handover. The terminal receives feedback about supported services and adjusts its behavior accordingly, creating a closed-loop control system that adapts to changing conditions
Data Source
AI summary
An operation for supporting a service in a wireless communication system. The operation may include receiving a request for a second service by a terminal/UE performing a first service in a first radio access technology (RAT), identifying at least one RAT capable of supporting the second service from a database including service support information in case that the first RAT is unable to perform the second service, performing handover to a second RAT included in the at least one RAT, and performing the second service in the second RAT.