Question: In NB-IoT networks, how does a User Equipment (UE) determine the Public Land Mobile Network (PLMN) to select for connectivity, based on parameters stored in the Universal Subscriber Identity Module (USIM)?
Option 1: By matching its device category with 'E-UTRA' as Access Technology in the PLMN selector of USIM Elementary Files.
Option 2: Solely based on 'NB-IoT' specified in the PLMNwAcT, OPLMNwAcT, and HPLMNwAcT USIM Elementary Files.
Option 3: By first identifying ‘E-UTRA’ as Access Technology in the PLMN selector of USIM Elementary Files (PLMNwAcT, OPLMNwAcT, and HPLMNwAcT), then utilizing its device category (= NB-IoT) for network access.
Option 4: Through a random selection from available PLMNs listed in the USIM, prioritizing those with 'NB-IoT' capabilities.
Explanation: This is correct because the UE initially selects the PLMN based on ‘E-UTRA’ as the Access Technology indicated in the relevant USIM Elementary Files. Subsequently, it utilizes its device category (identified as NB-IoT) to ensure proper access to the NB-IoT network, highlighting a two-step process for accurate network selection and connectivity.