Mobile station and mobile communication method

摘要

A mobile station and a mobile communication method are provided, which are capable of continuing output of an announcement sound even if a transition is made from LTE to 3G by SRVCC when the announcement sound is being received from a network side in response to a call request to a call-terminating terminal. A UE 100A executes continuation processing (SRVCC) of a 3G voice communication service if the mobile station makes a transition of a connection destination from LTE to 3G. Further, the UE 100A receives the announcement sound via LTE or 3G, and outputs the announcement sound after requesting alerting of the other party and before starting the alerting of the other party. The UE 100A outputs the announcement sound even after making a transition to 3G if the continuation processing of the voice communication service is executed during a period when the announcement sound is being outputted.

主权项

1. A mobile station capable of providing a voice communication service via an IP multimedia subsystem and configured to execute a transition from a first radio access system with no circuit-switched domain to a second radio access system with a circuit-switched domain, comprising:
a voice communication control circuit configured to execute continuation processing of the voice communication service in the second radio access system if the mobile station makes a transition of a connection destination from the first radio access system to the second radio access system; and an announcement control circuit configured to receive an announcement sound via the first radio access system or the second radio access system, and output the announcement sound after requesting an alerting of an other party and before starting the alerting of the other party, wherein the announcement control circuit outputs the announcement sound even after a transition to the second radio access system is made if the voice communication control circuit executes the continuation processing of the voice communication service during a period when the announcement sound is being outputted.