| 摘要 |
A mobile communications device with a wireless module and a controller module is provided. The wireless module selectively performs wireless transceiving to and from a first service network or a second service network. The controller module receives, via the wireless module, a handover request for a handover from the first service network to the second service network, and determines whether a Non-Access Stratum (NAS) message flow with a counted sequence number is active on a Circuit-Switched (CS) domain of the first service network in response to the handover request. Also, the controller module keeps the counted sequence number unchanged in response to the NAS message flow being active on the CS domain of the first service network. Specifically, the handover request is transmitted by the first service network in response to a Single Radio Voice Call Continuity (SRVCC) procedure between the first service network and the second service network.
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