Abstract: According to various embodiments, an electronic device includes at least one processor. The at least one processor is configured to: after establishing an RRC connection with a first cell of a first RAT, confirm the occurrence of an event associated with the release of the RRC connection with the first cell; camp on to a second cell of a second RAT different from the first RAT in response to the confirmation of the occurrence of the event; initiate a timer, defined in an NAS, on the basis of a failure to register to a core network corresponding to the second RAT; and perform one of a scan associated with the first RAT or a scan associated with a RAT according to a preset priority, on the basis of the initiation of the timer, according to whether a service performed while connected to the first cell is an IMS call service.

Abstract: In an electronic device and a method for operating an electronic device according to various embodiments of the disclosure, the electronic device may include: a first communication circuit configured to support first cellular communication; a second communication circuit configured to support second cellular communication; and a processor, and the processor may be configured to: control the second communication circuit such that the first cellular communication connection is released and the second cellular communication connection is performed or the second cellular communication connection is maintained in response to reception and/or transmission of a call connection request message while being connected to a network, determine, in response to termination of the call connection, whether to release the second cellular communication based on whether at least one condition including a condition related to whether a system information block receivable via the second cellular communication is received is satisf

Abstract: An electronic device may include at least one communication processor and an application processor. The at least one communication processor is configured to: receive first system information including information on whether at least one node supporting first cellular communication supports DC or second system information including information on a node which is adjacent to the at least one node and supports second cellular communication, from the at least one node via the first cellular communication; update, based on the first or second system information, a database which includes information indicating whether the at least one node supports the DC and information indicating whether the node adjacent to the at least one node supports the second cellular communication; determine, based on the updated database, a searching order of at least one node included in the updated database; and search for a node to be registered, based on the determined searching order.

Abstract: An electronic device may include at least one communication processor and an application processor. The at least one communication processor is configured to: receive first system information including information on whether at least one node supporting first cellular communication supports DC or second system information including information on a node which is adjacent to the at least one node and supports second cellular communication, from the at least one node via the first cellular communication; update, based on the first or second system information, a database which includes information indicating whether the at least one node supports the DC and information indicating whether the node adjacent to the at least one node supports the second cellular communication; determine, based on the updated database, a searching order of at least one node included in the updated database; and search for a node to be registered, based on the determined searching order.