Circuit-Switched Fallback With Improved Reliability in Pool Overlap Areas

摘要

Performing a circuit-switched fallback (CSFB) call with improved reliability. A request to establish a CSFB call may be received by a UE that is currently in a pool overlap area. The network resource controller, or the base station, transmits information to the UE which indicates the pools in which neighboring cells are operating. The UE uses this information to select a circuit-switched cell on which to operate for the CSFB operation, wherein the selected CS cell is in the same pool area as the current pool area. This prevents the UE from inadvertently camping on a CS cell in a different pool area, which could cause call failure on some networks. The information provided by the base station may comprise a pool area id, or may comprise mapping relation information that is useable by the UE to determine the current pool area.

主权项

1. A method for a wireless user equipment (UE) device to perform a circuit switched fallback (CSFB) call, the method comprising:
performing by the UE, receiving a request to perform a CSFB operation to handle a call, wherein the UE is operating in a current pool when the request is received; receiving pool information identifying pools in which a plurality of candidate cells are operating; performing the CSFB operation to handle the call, wherein said performing comprises selecting a circuit-switched cell on which to camp, wherein the circuit-switched cell is selected based on the pool information, wherein the selected circuit-switched cell is in the current pool.