Call setup for circuit switched fall back calls

摘要

Establishing a circuit-switched fallback (CSFB) call. A request to establish a CSFB call may be received. A first wireless link with a first cell may be released. The first cell may provide packet-switched services but not circuit-switched services. A second wireless link may be established with a second cell. The second cell may provide packet-switched services and circuit-switched services. The CSFB call may be established via the connection to the second cell. Packet-switched registration with the second cell may be performed after the CSFB call is established.

主权项

1. A method for a wireless user equipment (UE) device to initiate a circuit switched fallback (CSFB) call, the method comprising:
receiving a request to establish a CSFB call; releasing a connection to a first cell, wherein the first cell provides packet-switched services, wherein the first cell does not provide circuit-switched services; establishing a connection to a second cell, wherein the second cell provides packet-switched services and circuit-switched services; establishing the CSFB call via the connection to the second cell; performing packet-switched registration with the second cell after the CSFB call is established.