Multi-SIM UE IRAT Measurement for Faster Secondary Cell Camping
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Solution Overview
Problem
Multi-SIM User Equipment (UE) often stays in legacy Radio Access Technologies (RATs) despite the availability of newer RATs due to Radio Frequency (RF) grant unavailability, leading to delays in sending measurement reports and failing to camp on secondary cells.
Innovation Solution
The UE initiates Inter-Radio Access Technology (IRAT) measurements and reserves RF grants while waiting for reconfiguration messages from primary cells, using stored configurations and duty cycles to ensure faster camping on secondary cells.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If the UE waits for RF grant availability to send measurement reports, then the UE can maintain proper RF resource management for multi-SIM operation, but the camping time on the latest RAT is delayed
Solution Approach 1:
The UE performs IRAT measurements and prepares measurement reports in advance before the RF grant becomes available. By initiating measurements early and having the report ready when the RF grant is granted, the UE eliminates the waiting delay while maintaining proper RF resource management for multi-SIM operation.
2Loss of time
If the UE performs IRAT measurements immediately after returning from legacy RAT, then the UE can camp on the latest RAT faster, but the UE may miss reconfiguration messages from the primary cell
Solution Approach 1:
The UE performs IRAT measurements in advance before receiving the reconfiguration message, so that when the measurement report is needed, it is already prepared. This preliminary action ensures both fast camping and reliable message reception.
Solution Approach 2:
The UE monitors for reconfiguration messages from the primary cell and uses feedback from the network to determine when to send the measurement report. The UE adjusts its measurement reporting timing based on whether a reconfiguration message is received, ensuring reliable communication while maintaining fast camping capability.
Data Source
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Figure 1C
AI summary
A method disclosed herein includes registering, by a User Equipment (UE), with a primary cell of a first Radio Access Technology (RAT) after terminating at least one communication service initiated in a second RAT, and initiating, by the UE, Inter-Radio Access Technology (IRAT) measurement of a secondary cell before receiving a reconfiguration message from the primary cell in response to the registering, the secondary cell being associated with the primary cell.