Regulating IMS use with non-VoLTE cellular communications systems
AssigneeGeneral Motors Corporation
InventorsMohammad Ishfaq, David George
Life of this patent
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Abstract
A system and method of registering a voice over LTE (VoLTE) capable vehicle telematics unit with a wireless carrier system includes: detecting at the vehicle telematics unit a wireless signal broadcast by a cell tower; determining from the wireless signal whether the cell tower provides cellular service using a VoLTE cellular protocol; and when it is determined that the cell tower does not provide cellular service using the VoLTE protocol, then preventing the VoLTE-capable vehicle telematics unit from attempting to wirelessly connect with the cell tower using an IP multimedia subsystem (IMS) protocol.
Claims5
A method of registering a voice over long-term evolution (VoLTE) capable vehicle telematics unit with a wireless carrier system, comprising the steps of:
- (a) detecting at the vehicle telematics unit a wireless signal broadcast by a cell tower;
- (b) determining from the wireless signal whether the cell tower provides cellular service using a VoLTE cellular protocol;
- and
- (c) when it is determined in step (b) that the cell tower does not provide cellular service using the VoLTE protocol, then preventing the VoLTE-capable vehicle telematics unit from attempting to wirelessly connect with the cell tower using an IP multimedia subsystem (IMS) protocol;
- wherein step (c) further comprises communicating an instruction not use the IMS protocol from a processor of the vehicle telematics unit to a cellular chipset of the vehicle telematics unit.
A method of registering a voice over long-term evolution (VoLTE) capable vehicle telematics unit with a wireless carrier system, comprising the steps of:
- (a) detecting at the vehicle telematics unit a wireless signal broadcast by a first cell tower;
- (b) determining from the wireless signal broadcast by a first cell tower that the first cell tower provides cellular service using a VoLTE cellular protocol;
- (c) directing the VoLTE-capable vehicle telematics unit to wirelessly connect with the first cell tower using an IP multimedia subsystem (IMS) framework;
- (d) detecting at the vehicle telematics unit a wireless signal broadcast by a second cell tower;
- (e) determining from the wireless signal broadcast by a second cell tower that the second cell tower provides cellular service using a non-VoLTE cellular protocol;
- and
- (f) establishing cellular communications with the second cell tower while maintaining the previously-established IMS connection.
Dependencies are inferred from the claim text.