Call continuity when moving from one communication session to another communication session

摘要

In some embodiments, there are disclosed systems and methods in which, when a mobile device receives a message indicating that the mobile device is to release resources pertaining to a communication session for a voice call over an access network, the mobile device refrains from performing this action to allow for the possible arrival and processing of a delayed handover command. The arrival of the handover command causes the mobile device to handover to a second access network to continue the voice call using a second communication session. This may help address situations in which the handover command is delayed in the network and is therefore delayed in reaching the mobile device.

主权项

1. A method comprising:
during a first communication session for a voice call over a first access network, receiving a message at a mobile device, the message indicating that the mobile device is to release resources pertaining to the first communication session for the voice call over the first access network; when no handover command, different from the message at the mobile device, has been received by the mobile device before receipt of the message, then the mobile device refraining from releasing the resources pertaining to the first communication session despite receipt of the message, and the mobile device instead waiting during the refraining for arrival of a handover command, different from the message, for a predetermined amount of time after receipt of the message before releasing resources pertaining to the first communication session; if the handover command is not received during said refraining, then the mobile device releasing the resources pertaining to the first communication session without handing over to a second access network upon expiry of the predetermined amount of time and indicating that the voice call has been terminated.