Multi-USIM UE Capability Management for Dual-Registration
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Solution Overview
Problem
Multi-USIM user equipment (UE) faces challenges in effectively managing and reporting its capabilities when registered to multiple cellular networks, particularly in utilizing capabilities related to different radio access technologies (RATs) for communication with respective networks.
Innovation Solution
The UE implements techniques to report its capabilities by transmitting specific information elements (IEs) such as UE SUTRA-Capability IE or UE-NR-Capability IE to both 4G and 5G RANs, allowing for detailed capability information exchange, and optionally disables 5G capabilities if hardware limitations are present, ensuring accurate resource allocation across networks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a multi-USIM UE reports all UE capabilities to multiple cellular networks, then network compatibility and performance are improved, but device complexity and resource management difficulty increase
Solution Approach 1:
The UE capability information is segmented into different types (e.g., 5G NR capabilities, 4G E-UTRA capabilities, DC capabilities) and reported selectively to different networks based on their specific requirements. The UE maintains separate capability sets for different RATs and activates them contextually, avoiding the need to report all capabilities to all networks simultaneously.
Solution Approach 2:
The UE dynamically adjusts which capability set is active and reported based on the current network context, registered USIM, and target network type. The capability reporting mechanism is flexible and adaptive, allowing the UE to switch between different capability configurations without manual intervention or complex reconfiguration procedures.
2Adaptability or versatility
If a multi-USIM UE simultaneously maintains registration with multiple cellular networks, then service availability and communication flexibility are improved, but capability information management and resource allocation become more difficult
Solution Approach 1:
The UE pre-configures multiple sets of capability information corresponding to different network scenarios and USIM cards before actual communication occurs. Each capability set is prepared in advance and can be quickly activated when needed, eliminating the need for complex real-time capability negotiation and reducing operational complexity during actual network switching.
3Productivity
If the UE reports detailed capability information to both 4G and 5G networks, then optimal resource allocation is achieved, but signaling overhead and processing requirements increase
Solution Approach 1:
Different levels of capability detail are provided to different networks based on their specific needs. The UE reports comprehensive capabilities to networks that require detailed information for optimal resource allocation, while providing more condensed capability summaries to networks that only need basic compatibility information, thereby reducing overall signaling overhead.
Data Source
AI summary
A user equipment (UE) can implement a method for managing UE capability information. The method includes: registering (1702) with a first cellular network via a first RAN using a first universal subscriber identity module (USIM); registering (1704) with a second cellular network via a second RAN using a second USIM; transmitting (1706), to the first RAN, a first indication of a UE capability for communicating with the first RAN over a first RAT; and based on whether the UE supports communicating over a second RAT, which is different from the first RAT, while registered to both the first cellular network and the second cellular network, either: (i) transmitting (1710), to the first RAN, a second indication of a UE capability for communicating with the first RAN over the second RAT; or (ii) disabling (1712) UE capabilities dedicated to communicating over the second RAT.