Automatic SIM Card Selection for Roaming Cost Reduction
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Solution Overview
Problem
Dual-SIM mobile phone users face inconvenient manual switching between SIM cards, leading to unnecessary roaming charges due to incorrect network selection.
Innovation Solution
A method for automatic SIM card selection on user equipment (UE) that scans different communication ranges using various radio access technologies (RATs) to match SIM card identity information with public land mobile network (PLMN) identifications, automatically setting the matching SIM card as primary to avoid roaming charges.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If manual SIM card switching is used, then device complexity is reduced, but ease of operation deteriorates and roaming costs increase
Solution Approach 1:
The system performs automatic SIM card selection by itself without user intervention. The UE automatically scans PLMN identification information, compares it with SIM card identity information, and selects the appropriate SIM card based on the matching results, making the system self-serving.
Solution Approach 2:
The system uses feedback from PLMN scanning results to make selection decisions. The UE continuously monitors network environment, receives PLMN identification information from base stations, compares it with stored SIM card identities, and adjusts SIM card selection based on this feedback loop.
2Object-affected harmful factors
If manual SIM card switching is used, then device complexity is reduced, but roaming costs increase due to wrong judgment
Solution Approach 1:
The system performs preliminary comparison of PLMN identification information with SIM card identity information before establishing communication. By pre-matching the network identity with the appropriate SIM card identity, the system prevents incorrect network selection that would lead to roaming charges.
Solution Approach 2:
The patent replaces manual mechanical switching with an automated information processing system. Instead of physical SIM card removal and insertion or manual selection through settings, the system uses automated scanning, comparison, and selection based on PLMN and SIM card identity information matching.
3Ease of operation
If automatic SIM card selection is implemented, then ease of operation is improved, but device complexity increases
Solution Approach 1:
The system performs automatic SIM card selection by itself without user intervention. The UE automatically scans PLMN identification information, compares it with SIM card identity information, and selects the appropriate SIM card based on the matching results, making the system self-serving.
4Adaptability or versatility
If multiple RATs are scanned, then adaptability to different networks is improved, but use of energy increases
Solution Approach 1:
The system performs preliminary comparison of PLMN identification information with SIM card identity information before establishing communication. By pre-matching the network identity with the appropriate SIM card identity, the system prevents incorrect network selection that would lead to roaming charges.
Data Source
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AI summary
A method of automatic SIM card selection on a multi-SIM user equipment according to network environment is provided. When the user equipment leave its current communication range and enters a new communication range, one or more RATs are used to scan the new communication range and the identity information of each SIM card is compared with the PLMN identification of each scanned PLMN. If a match can be found, the matching SIM card is automatically set as the primary SIM card in order to avoid roaming charge.