| 摘要 |
Circuit - switched fallback CSFB is a technique to deliver voice - services to a mobile, when the mobile is camped in a long-term evolution LTE network. This may be required when the LTE network does not support voice services natively. If a user makes a mobile originating MO call, or receives a mobile terminating MT call, the UE may inform the LTE network that the UE is leaving for the call by initiating a call setup procedure (502). However, there may be instances where the call setup procedure may fail. For example, the UE may not be moved to the 1x network, or the UE may be moved to the 1x network but the call may fail there. If the call setup procedure was either not initiated, or was initiated but failed, the UE may determine to search (504) for a suitable CS RAT/cell on its own without instructions/commands from the network. Therefore, certain aspects of the present disclosure provide techniques for the UE to find CS services based on information collected at the UE. |
