RAT Mode Selection via Location Validation

Solution Overview

Problem

Conventional methods for selecting the best registered public land mobile network (RPLMN) radio access technology (RAT) in wireless communication devices often result in the selection of lower priority RATs, leading to inefficient technology use and reduced user experience, especially in scenarios like Dual SIM Dual Standby devices and during SIM swaps, where higher priority RATs are delayed due to resource constraints.

Innovation Solution

The proposed method involves determining location information, validating it, and deriving the RPLMN access technology (AccTech) to select the most suitable RAT mode by prioritizing LTE, UMTS, and GSM based on the validated location information and update status, ensuring quick and efficient registration even when the Subscriber Identity Module (SIM) changes.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If conventional methods use flash memory to store and retrieve RPLMN AccTech for RAT selection, then the device can maintain previous network selection preferences, but the device may select lower priority RATs due to outdated or incorrect stored information, resulting in delayed registration and reduced network performance

Engineering Contradiction:

ImproveRAT selection accuracyVSAvoidRegistration delay

Core Design Contradiction:

ReliabilityVSLoss of time

Solution Approach 1:

The patent performs preliminary validation of location information and derivation of RPLMN AccTech before actual RAT selection occurs. By pre-validating location data and pre-deriving the correct RPLMN access technology based on current network conditions, the system ensures that the most appropriate RAT is selected immediately upon device power-on or network re-entry, eliminating delays caused by retrieving outdated stored preferences.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent implements a feedback mechanism where the device continuously validates location information and updates RPLMN AccTech derivation based on current network conditions. This feedback loop ensures that the stored AccTech information remains accurate and reflects the current optimal RAT selection, preventing the device from selecting lower priority RATs due to outdated information while maintaining reliable network registration.

Inventive Principle:

Principle #23Feedback

2Adaptability or versatility

If Dual SIM Dual Standby devices use a single RF resource for both SIMs, then the device can maintain both SIMs in standby mode, but RAT reselection to higher priority networks is delayed due to resource constraints and activity on the other SIM

Engineering Contradiction:

ImproveMulti-SIM functionalityVSAvoidRAT reselection speed

Core Design Contradiction:

Adaptability or versatilityVSSpeed

Solution Approach 1:

The patent performs preliminary validation of location information and derivation of RPLMN AccTech before actual RAT selection occurs. By pre-validating location data and pre-deriving the correct RPLMN access technology based on current network conditions, the system ensures that the most appropriate RAT is selected immediately upon device power-on or network re-entry, eliminating delays caused by retrieving outdated stored preferences.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent implements dynamic RAT selection that adapts to the current operational state of Dual SIM devices. The system dynamically determines whether to use stored AccTech from flash memory or derive new AccTech based on current network conditions and SIM activity status, allowing optimal performance whether one or both SIMs are active. This dynamic approach enables faster RAT reselection by selecting the most appropriate path based on real-time conditions.

Inventive Principle:

Principle #15Dynamics

3Device complexity

If UEs follow the priority order LTE>3G>2G for RAT selection during SIM changes, then the device maintains a simple selection algorithm, but the registration process is delayed as the device may unnecessarily attempt lower priority RATs first

Engineering Contradiction:

ImproveSelection algorithm simplicityVSAvoidRegistration efficiency

Core Design Contradiction:

Device complexityVSProductivity

Solution Approach 1:

The patent performs preliminary validation of location information and derivation of RPLMN AccTech before actual RAT selection occurs. By pre-validating location data and pre-deriving the correct RPLMN access technology based on current network conditions, the system ensures that the most appropriate RAT is selected immediately upon device power-on or network re-entry, eliminating delays caused by retrieving outdated stored preferences.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent changes the selection parameter from a fixed priority order to a dynamically derived RPLMN AccTech based on validated location information. This parameter change allows the system to select the optimal RAT (whether LTE, 3G, or 2G) based on current network conditions rather than following a rigid priority sequence, significantly improving registration efficiency while maintaining algorithmic simplicity through automated derivation.

Inventive Principle:

Principle #35Parameter changes

Data Source

PatentUS10313963B2Methods for selecting radio access technology (RAT) modes in wireless communication devices

Publication Date: 2019.06.04 SAMSUNG ELECTRONICS CO LTD

AI summary

Some example embodiments disclose methods for selecting registered public land mobile network (RPLMN) radio access technology (RAT) modes in wireless communication devices. The method as disclosed herein includes determining location information of the wireless communication device; validating the location information; deriving a RPLMN from the validated location information when the validating is successful; storing a RPLMN access technology (AccTech) based on the derived RPLMN; and selecting a RAT mode using the stored RPLMN AccTech.