Multi-SIM UE RF Grant Holding 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 delayed measurement reports and failure to configure secondary cells.

Innovation Solution

The UE initiates Inter-Radio Access Technology (IRAT) measurements and reserves RF grants while waiting for reconfiguration messages from the primary cell, using stored configurations and duty cycles to ensure faster camping on secondary cells.

Engineering Contradictions & Design Principles

VSEngineering 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 allocation, but the camping process is delayed and the UE stays in legacy RAT longer

Engineering Contradiction:

Improvecamping delayVSAvoidservice quality

Core Design Contradiction:

Loss of timeVSProductivity

Solution Approach 1:

The UE performs IRAT measurements in advance before receiving the reconfiguration message and before RF grant becomes available. By initiating measurements early (at operation 109-1 in FIG. 1A), the UE prepares measurement data that can be reported as soon as RF grant is available, eliminating the waiting delay and enabling faster camping on NR RAT.

Inventive Principle:

Principle #10Preliminary action

2Speed

If the UE performs IRAT measurements immediately after returning from legacy RAT, then the UE can camp on latest RAT faster, but the UE may miss reconfiguration messages due to RF grant unavailability

Engineering Contradiction:

Improvecamping speedVSAvoidmessage reception reliability

Core Design Contradiction:

SpeedVSReliability

Solution Approach 1:

The UE performs IRAT measurements preliminarily before the reconfiguration message is received. The measurement process is initiated early (operation 109-1 in FIG. 1A) and continues in the background, so that when the reconfiguration message arrives and RF grant becomes available, the UE already has measurement results ready for immediate reporting, achieving both speed and reliability.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The measurement process continues uninterrupted in the background even while waiting for RF grant and reconfiguration message. The UE maintains continuous measurement activity (operation 109-1 through 110-1 in FIG. 1A) rather than pausing, ensuring that measurements are always ready to be reported when resources become available.

Inventive Principle:

Principle #20Continuity of useful action

3Duration of action of moving object

If the LTE BS waits for pre-defined duration for measurement report, then the BS can ensure proper timing, but the NR configuration is released and UE remains in legacy RAT

Engineering Contradiction:

Improvemeasurement report timingVSAvoidRAT transition time

Core Design Contradiction:

Duration of action of moving objectVSLoss of time

Solution Approach 1:

The UE performs measurements in advance before the pre-defined timing window expires. By initiating measurements early (operation 109-1 in FIG. 1A) and completing them before the BS releases the NR configuration (operation 110-1), the UE ensures measurement reports are ready within the required timing, preventing configuration release and enabling successful RAT transition.

Inventive Principle:

Principle #10Preliminary action

Data Source

PatentUS12532284B2Methods and systems for enabling multi-SIM UE to perform faster camping in wireless communication system

Publication Date: 2026.01.20 SAMSUNG ELECTRONICS CO LTD

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.