Multi-USIM UE Service Requests Without Allowed NSSAI
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Solution Overview
Problem
Current 5G mobile communication systems lack standardized UE behavior for multi-USIM (MUSIM) features, leading to delays and unpredictable UE actions when switching between PLMNs without allowed NSSAI, causing negative user experiences and network inefficiencies.
Innovation Solution
Implementing a method for UEs with MUSIM capability to initiate service request procedures based on MUSIM features, allowing specific triggers to send NAS messages or enter idle modes, and defining UE behaviors for 5GMM-CONNECTED and 5GMM-IDLE modes to manage network transitions efficiently.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If UE initiates service request procedure without allowed NSSAI for MUSIM feature, then service responsiveness is improved, but network signaling waste increases
Solution Approach 1:
The patent changes the parameter of service request initiation by introducing a conditional check: UEs with MUSIM capability are allowed to initiate service request procedures even without allowed NSSAI when the trigger is related to MUSIM features. This parameter change resolves the contradiction by selectively permitting service requests based on the trigger type, improving MUSIM service responsiveness while avoiding unnecessary signaling for other service types.
2Productivity
If UE behavior for MUSIM is standardized, then network efficiency is improved, but device complexity increases
Solution Approach 1:
The patent segments UE behavior into distinct modes (5GMM-CONNECTED and 5GMM-IDLE) with specific standardized actions for each. By dividing the complex MUSIM operation into mode-specific behaviors, the patent improves network efficiency through standardized handling while managing device complexity through structured, mode-based decision logic rather than monolithic complex behavior.
Solution Approach 2:
The patent introduces dynamic UE behavior where the UE can transition between 5GMM-CONNECTED and 5GMM-IDLE modes based on MUSIM service requirements. This dynamic approach allows the UE to adapt its behavior to current network conditions and service needs, improving overall network efficiency while providing clear standardized transition rules that manage complexity.
3Adaptability or versatility
If UE switches between PLMNs without allowed NSSAI, then service availability is improved, but service delays occur
Solution Approach 1:
The patent enables preliminary action by allowing UEs with MUSIM capability to initiate service request procedures before obtaining allowed NSSAI when the trigger is related to MUSIM features. This preliminary service request initiation improves service availability for MUSIM operations while the standardized handling and mode transitions minimize service delays that would otherwise occur during PLMN switching.
Data Source
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.