Apparatus and methods for service acquisition when moving in and out of fourth generation (4G) networks with different circuit-switched fallback (CSFB) support

A fourth generation (4G) capable user equipment (UE), comprising:

• a 4G service change possibility determination component configured to:
• determine, when the 4G capable UE does not report a 4G capability but reports one or more other radio access technology (RAT) capabilities, a 4G service change possibility for the 4G capable UE;
• and
• a service acquisition component configured to:
• perform a 4G network search and measurement procedure in response to the determination of the 4G service change possibility;
• and
• perform a combined evolved packet system/circuit switched (EPS/CS) attach attempt procedure when the 4G network search and measurement procedure indicates a 4G network availability.

A fourth generation (4G) capable user equipment (UE), comprising:

• means for determining, when the 4G capable UE does not report a 4G capability but reports one or more other radio access technology (RAT) capabilities, a 4G service change possibility for the 4G capable UE;
• means for performing a 4G network search and measurement procedure in response to the determination of the 4G service change possibility;
• and
• means for performing a combined evolved packet system/circuit switched (EPS/CS) attach attempt procedure when the 4G network search and measurement procedure indicates a 4G network availability.

A non-transitory computer-readable medium for a fourth generation (4G) capable user equipment (UE), comprising:

• code executable by a computer to determine, when the 4G capable UE does not report a 4G capability but reports one or more other radio access technology (RAT) capabilities, a 4G service change possibility for the 4G capable UE;
• code executable by the computer to perform a 4G network search and measurement procedure in response to the determination of the 4G service change possibility;
• and
• code executable by the computer to perform a combined evolved packet system/circuit switched (EPS/CS) attach attempt procedure when the 4G network search and measurement procedure indicates a 4G network availability.