CDMA/Multimode VoLTE Device with Reduced Time to Camp

摘要

A user equipment (UE) may camp on a network following a SIM bootup. Specifically, the UE may determine that a SIM implementation module of the UE includes a first SIM application (e.g., USIM) associated with a first cellular radio access technology (RAT) (e.g., LTE) and a second SIM application (e.g., CSIM) associated with a second cellular RAT (e.g., CDMA). The UE may then initialize the first SIM application and the second SIM application. The UE may determine whether the network is configured to support both voice and data communications using the first cellular RAT. If so, the UE may initiate camping on the network with the first cellular RAT in response to determining that the first SIM application is ready, but before the second SIM application is ready. If not, the UE may wait until both the first and second SIM applications are ready before initiating camping on the network.

主权项

1. A user equipment (UE), comprising:
at least one antenna; a radio coupled to the at least one antenna for performing wireless cellular communications with a cellular network; a subscriber identity module (SIM) implementation module coupled to the radio, the SIM implementation module storing at least a first SIM application associated with a first cellular radio access technology (RAT) and a second SIM application associated with a second cellular RAT; and at least one processing element coupled to the radio; wherein the UE is configured to:
initialize the first SIM application;initialize the second SIM application; andinitiate camping on the cellular network with the first cellular RAT before the second SIM application is ready, at least partially in response to determining that the first SIM application is ready.