Handling ims and csfb call at user equipment in wireless network
AssigneeSamsung Electronics Co., Ltd.
InventorsSrinivas Chinthalapudi, Prasad Basavaraj Dandra
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Abstract
Methods and apparatuses are provided for controlling a voice call at a user equipment (UE) in a wireless network. A method includes transmitting, to a network entity, a tracking area update (TAU) service request for a subsystem (IMS) initiation; receiving, from the network entity, a TAU service reject message; and in response to the TAU service reject message, stopping a circuit switch (CS) fall back call in at least one legacy radio technology (RAT).
Claims20
A method for controlling a voice call at a user equipment (UE) in a wireless network, the method comprising:
- transmitting, to a network entity, a tracking area update (TAU) request or a service request for an internet protocol multimedia subsystem (IMS) initiation in an abnormal state;
- receiving, from the network entity, a TAU reject message or a service reject message;
- and
- in response to the TAU reject message or the service reject message, starting a circuit switch (CS) fall back call in at least one legacy radio technology (RAT).
2-13. (canceled)
A method for controlling a voice call at a network entity in a wireless network, the method comprising:
- receiving, from a user equipment (UE), a tracking area update (TAU) request or a service request for an internet protocol multimedia subsystem (IMS) initiation in an abnormal state of the UE;
- and
- in response to the TAU service request or the service request, transmitting, to the UE, a TAU reject message or a service reject message for starting a circuit switch (CS) fall back call in at least one legacy radio technology (RAT).
A user equipment (UE) for a voice call in a wireless network, the UE comprising:
- a transceiver;
- and
- at least one processor, which is connected to the transceiver, configured to control the transceiver to:
- transmit, to a network entity, a tracking area update (TAU) request or a service request for an internet protocol multimedia subsystem (IMS) initiation in an abnormal state,
- receive, from the network entity, a TAU reject message or a service reject message, and
- in response to the TAU reject message or the service request message, start a circuit switch (CS) fall back call in at least one legacy radio technology (RAT).
Dependencies are inferred from the claim text.