Notifying availability of internet protocol multimedia subsystem services

Abstract

Methods, systems, and devices are described for receiving, by a mobile device via a second RAT, an indication of the availability of a service on a first RAT. The mobile device may determine a configuration for a voice call session based on the availability of the service on the first RAT. The mobile device may initiate the voice call session according to the determined configuration.

What is claimed is: 
     
         1 . A method for wireless communication, comprising:
 receiving, via a second radio access technology (RAT), an indication of the availability of a service on a first RAT;   determining, by a mobile device, a configuration for a voice call session based on the availability of the service on the first RAT; and   initiating the voice call session according to the determined configuration.   
     
     
         2 . The method of  claim 1 , further comprising:
 de-registering the service on the mobile device in response to receiving an indication that the service is not available on the first RAT.   
     
     
         3 . The method of  claim 1 , wherein receiving the indication of the availability of the service on the first RAT comprises:
 receiving a beacon via the second RAT.   
     
     
         4 . The method of  claim 3 , wherein the beacon comprises a first information element indicative of the first RAT and a second information element indicative of the availability of the service on the first RAT. 
     
     
         5 . The method of  claim 4 , wherein the first RAT is a cellular communications network and the service is a voice over Long Term Evolution (LTE) (VoLTE) service available for the mobile device. 
     
     
         6 . The method of  claim 1 , wherein the first RAT comprises a cellular communications network and the second RAT comprises a wireless local area network. 
     
     
         7 . The method of  claim 1 , wherein the service is a semi-persistent scheduling service. 
     
     
         8 . An apparatus for wireless communication, comprising:
 a receiver configured to receive, via a second radio access technology (RAT), an indication of the availability of a service on a first RAT; and   a voice call session manager configured to determine, by a mobile device, a configuration for a voice call session based on the availability of the service on the first RAT, and to initiate the voice call session according to the determined configuration.   
     
     
         9 . The apparatus of  claim 8 , wherein the voice call session manager is further configured to:
 de-register the service on the mobile device in response to receiving an indication that the service is not available on the first RAT.   
     
     
         10 . The apparatus of  claim 8 , wherein the receiver configured to receive the indication of the availability of the service on the first RAT is further configured to:
 receive a beacon via the second RAT.   
     
     
         11 . The apparatus of  claim 10 , wherein the beacon comprises a first information element indicative of the first RAT and a second information element indicative of the availability of the service on the first RAT. 
     
     
         12 . The apparatus of  claim 11 , wherein the first RAT is a cellular communications network and the service is a voice over Long Term Evolution (LTE) (VoLTE) service available for the mobile device. 
     
     
         13 . An apparatus for wireless communication, comprising:
 a processor;   memory in electronic communication with the processor; and   instructions stored in the memory, wherein the instructions are executable by the processor to:   receive, via a second radio access technology (RAT), an indication of the availability of a service on a first RAT;   determine, by a mobile device, a configuration for a voice call session based on the availability of the service on the first RAT; and   initiate the voice call session according to the determined configuration.   
     
     
         14 . The apparatus of  claim 13 , wherein the instructions are executable by the processor to:
 de-register the service on the mobile device in response to receiving an indication that the service is not available on the first RAT.   
     
     
         15 . The apparatus of  claim 13 , wherein the instructions executable by the processor to receive the indication of the availability of the service on the first RAT are executable to:
 receive a beacon via the second RAT.   
     
     
         16 . The apparatus of  claim 15 , wherein the beacon comprises a first information element indicative of the first RAT and a second information element indicative of the availability of the service on the first RAT. 
     
     
         17 . The apparatus of  claim 16 , wherein the first RAT is a cellular communications network and the service is a voice over Long Term Evolution (LTE) (VoLTE) service available for the mobile device. 
     
     
         18 . The apparatus of  claim 13 , wherein the first RAT comprises a cellular communications network and the second RAT comprises a wireless local area network. 
     
     
         19 . The apparatus of  claim 13 , wherein the service is a semi-persistent scheduling service.