Management of voice services for user equipments in coverage enhancement (CE) mode B

One or more non-transitory computer-readable media having instructions, stored thereon, that when executed by one or more processors, are to cause a internet protocol (IP) multimedia services (IMS) server to:

• transmit a session initiation protocol (SIP) invite to a first user equipment (UE);
• obtain, from the first UE responsive to the SIP invite, a request to deregister the first UE from voice services on a wireless communication network;
• obtain a mobile terminated (MT) call trigger from a second UE to initiate an MT call with the first UE;
• and
• reject the MT call trigger based on the request to deregister the first UE from voice services.

An apparatus to be employed by a user equipment (UE), the apparatus comprising:

• circuitry to implement a cellular protocol stack to determine that radio conditions on a wireless communication network are below a quality level;
• and
• internet protocol (IP) multimedia services (IMS) circuitry coupled to the cellular protocol stack, the IMS circuitry to:
• receive an indication from the cellular protocol stack that the radio conditions are below the quality level;
• receive a session initiation protocol (SIP) invite from an IMS server to request initiation of a voice call;
• and
• reject the SIP invite and deregister from voice services on the wireless communication network in response to the SIP invite and based on the indication that the radio conditions are below the quality level.

A processor included in a user equipment (UE) for a cellular communication network, the processor comprising:

• first circuitry to execute one or more instructions that cause the processor to perform operations comprising determining that radio conditions in the cellular communication network is below a quality level;
• and
• second circuitry to execute one or more instructions that cause the processor to perform operations comprising:
• transitioning the UE to a coverage enhancement (CE) mode B based on the determination about the radio conditions;
• processing a session initiation protocol (SIP) invite received from an internet protocol (IP) multimedia services (IMS) server, the SIP invite to request initiation of a voice call;
• and
• rejecting the SIP invite and deregister the UE from voice services on the cellular communication network in response to the SIP invite and based on operation of the UE in the CE mode B.