Multi-USIM Service Request Handling Without Allowed NSSAI
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Solution Overview
Problem
Current 5G mobile communication systems do not adequately address the challenges of multi-USIM (universal subscriber identity module) capable UEs, leading to delays and undefined UE behaviors when switching between PLMNs due to lack of allowed NSSAI, particularly in 5GMM-CONNECTED mode with RRC inactive indication and 5GMM-IDLE mode with suspend indication, resulting in negative user experiences and network inefficiencies.
Innovation Solution
A method for a UE with MUSIM capability allows the initiation of a service request procedure even without allowed NSSAI if the trigger is related to a MUSIM feature, and enables the UE to autonomously transition to idle mode or request NAS connection release with paging restrictions, ensuring standardized behavior and reducing service delays.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the UE strictly follows the prohibition of service request procedure without allowed NSSAI, then network protocol compliance is improved, but MUSIM service switching between PLMNs is delayed
Solution Approach 1:
The patent changes the parameter of service request prohibition from absolute to conditional. The UE determines whether to prohibit service requests based on the trigger type: for MUSIM-related triggers (plmn-reselection, nrnc-reselection), the UE allows service requests even without allowed NSSAI, while for other triggers the prohibition remains. This selective parameter adjustment resolves the contradiction by enabling timely MUSIM switching while maintaining protocol compliance for non-MUSIM services.
2Ease of operation
If the UE autonomously transitions to idle mode or requests NAS connection release, then standardized UE behavior is improved, but service procedure complexity increases
Solution Approach 1:
The patent introduces dynamic behavior adjustment based on UE state and trigger type. The UE autonomously transitions to idle mode or requests NAS connection release only when in connected mode with RRC inactive indication or suspend indication, and only for MUSIM-related triggers. This dynamic approach standardizes behavior where needed while avoiding unnecessary complexity in other scenarios, resolving the contradiction between standardized behavior and procedure complexity.
Data Source
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AI summary
A method and an apparatus with multi-universal subscriber identity module (MUSIM) capability in wireless communication system. A service request procedure is initiated in case that a user equipment (UE) does not have allowed network slice selection assistance information (NSSAI) and an associated trigger is related to a MUSIM feature.