Voice RAT Selection Using Cross-Network Signal Measurements
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In scenarios where a mobile device is in an area with overlapping coverage of Voice over Long Term Evolution (VOLTE) and Voice over New Radio (VoNR) from both home and roaming partners, there is no intelligent selection of the most optimal coverage, leading to suboptimal network usage.
Innovation Solution
A mobile device performs measurements on signals from a newer generation cellular base station and sends these measurements to an older generation base station, triggering a release command for the device to switch to the newer generation base station if the measurements meet certain criteria, such as RSRP and SINR thresholds, ensuring higher bandwidth and lower latency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the home network VoNR coverage is selected or EPS fallback is performed, then the mobile device can maintain connectivity, but there is no intelligent selection of the most optimum coverage leading to suboptimal network usage
Solution Approach 1:
The mobile device performs measurements (RSRP, SINR) on neighboring base stations and feeds this information back to the network. The network uses this feedback to make intelligent decisions about RAT selection and handover, transitioning from default-based selection to data-driven optimization that considers actual signal quality and network conditions.
Solution Approach 2:
The system dynamically adjusts the RAT selection based on real-time measurement reports and network conditions. Instead of static home network preference, the system adapts its behavior by evaluating current signal quality, cell load, and available resources to determine the optimal network path at any given moment.
2Productivity
If measurements are performed continuously to find optimal coverage, then network selection improves, but the device complexity and measurement overhead increase
Solution Approach 1:
Instead of continuous measurement, the system performs measurements periodically or triggers them based on specific events (e.g., when entering a new coverage area, when signal quality changes). This reduces measurement overhead while still capturing necessary network condition changes, balancing selection quality with device complexity.
Solution Approach 2:
The mobile device performs preliminary measurements of neighboring base stations in advance before actual handover is needed. By pre-measuring signal quality and storing this information, the device can make faster, more informed decisions when network conditions change, reducing the need for complex real-time analysis.
Data Source
AI summary
Various arrangements for switching between Radio Access Technologies (RATs) are present. Measurements can be performed on signals from a first cellular base station by a mobile device that is actively communicating with a second cellular base station. The first cellular base station uses a different RAT than the second cellular base station. The mobile device is compatible with RATs of both the first cellular base station and the second cellular base station. The mobile device can send the measurements for the first cellular base station to the second cellular base station. The second cellular base station can send a release command to the mobile device responsive to the measurements, thus causing the mobile device to connect with the first cellular base station.