In 5g, besides CONNECTED and IDLE states, a ue can be moved to an INACTIVE state, which allows the network to preserve “active” connection with cn, while the connection within the ran is “idle”. When a connection between a ue and ran is established, the ue moves to the CONNECTED state in both network segments and can be explicitly tracked by the network. TABLE I: Classification of multi-SIM support challenges. ∙ Multi-sim ue camps on different networks Thus, some solutions are applicable only if connections for all sims are maintained in 5g systems, while others allow a connection on 4g networks. The solutions under 3gpp discussion have been grouped into different categories summarized in Table I. These solutions specify methods or necessary changes to the existing procedures to account for the different aspects of the multi-sim ue configuration, connections onto the networks and user preferences regarding the handling the arriving services when busy with a call over another sim. To deal with the above challenges, the 3gpp has defined 28 candidate solutions for improved multi-sim operation in.

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