Patent ID: 9374797
Filing Date: 2016-06-21
CPC Classification: H04W

Claim Text:
1. A mobile communication device, comprising: a wireless module, configured to perform wireless transceiving to and from a service network; and a controller module, configured to perform a combined attach procedure or a combined Routing Area Update (RAU) procedure by transmitting an attach request message or an RAU request message to the service network via the wireless module, receive an attach accept message or an RAU accept message for the combined attach procedure or the combined RAU procedure, which comprises a reject cause for Circuit-Switched (CS) domain services, from the service network via the wireless module, and prohibit retrying the combined attach procedure or the combined RAU procedure to obtain the CS domain services, in response to the attach accept message or the RAU accept message comprising the reject cause for the CS domain services; wherein the reject cause indicates that a congestion or network failure has occurred in the CS domain of the service network, or indicates that the CS domain of the service network is temporarily not reachable through the PS domain of the service network.