Question: In a 3GPP system supporting Multiple USIMs (MUSIM) User Equipment (UE), how are registrations from different USIMs on the same UE treated?
Option 1: As a single, combined registration with shared IMEI/PEI.
Option 2: Independently, with each registered USIM associated with a dedicated IMEI/PEI.
Option 3: Sequentially, where one USIM must be deregistered before another can register.
Option 4: Only one USIM can be registered at a time, despite the UE's MUSIM capability.
Explanation: In a 3GPP system supporting MUSIM UEs, each USIM's registration is handled independently to ensure seamless and separate connections for each, enhancing both system performance and user experience. This independence necessitates that each registered USIM has its own dedicated identifier (IMEI/PEI) for effective network management and communication.