US Patent No. 9,258,748

CIRCUIT SWITCH FALLBACK HANDLING FOR WIRELESS COMMUNICATION DEVICES IN WIRELESS COMMUNICATION NETWORKS


Patent No. 9,258,748
Issue Date February 09, 2016 
Title Circuit Switch Fallback Handling For Wireless Communication Devices In Wireless Communication Networks
Inventorship Deveshkumar Narendrapratap Rai, Overland Park, KS (US)
Maulik K. Shah, Overland Park, KS (US)
Jasinder Pal Singh, Olathe, KS (US)
Jose L. Hernandez, Overland Park, KS (US)
Assignee Sprint Communications Company L.P., Overland Park, KS (US)

Claim of US Patent No. 9,258,748

1. A method of operating a wireless communication device that is initially configured to use circuit switch fallback (CSFB)
services over a first wireless communication network, the method comprising:
wirelessly registering with the first communication network to receive a wireless data service;
after the registration with the first communication network and responsive to an enabled CSFB configuration, wirelessly registering
with a second wireless communication network to receive a wireless circuit switched voice service;

identifying a service problem with the second wireless communication network, and in response, de-registering from the first
wireless communication network and disabling the CSFB configuration;

after disabling the CSFB configuration, re-registering with the first wireless communication network to receive the wireless
data service;

after the re-registration with the first wireless communication network, exchanging voice communications over the wireless
data service of the first wireless communication network without using the CSFB services; and

monitoring a service timer and responsive to the service timer expiring and to service quality of the second communication
network exceeding a quality threshold, enabling the CSFB configuration with the first communication network.