Voice service in evolved packet system
First Claim
1. A method in a User Equipment (UE) with a first indicator related to voice services in an Evolved Packet System (EPS), the method, performed by at least one processor, comprising:
- receiving, by a receiver of the UE, a Non Access Stratum (NAS) protocol Accept message from a network, wherein the NAS protocol Accept message comprises a second indicator that indicates that the network supports an IP Multimedia Subsystem (IMS) Voice over Packet Switched (PS) session;
responsive to the first indicator and the second indicator, determining availability of voice services over IMS wherein determining availability of voice services over IMS further comprises performing an attempt to register with an IMS; and
based on a failure of the attempt to register with the IMS, performing, by the UE, a combined Tracking Area Update (TAU), wherein the combined TAU comprises a combined Tracking Area/Location Area (TA/LA) update as a single NAS registration procedure used to attempt to register for both Packet Switched (PS) and Circuit Switched (CS) services.
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Abstract
Methods and apparatus to manage voice service in evolved packet systems are disclosed. An example method in a User Equipment (UE) with a first indicator related to voice services in an Evolved Packet System (EPS) comprises receiving a Non Access Stratum (NAS) protocol response message with a second indicator and responsive to at least one of the first indicator or the second indicator, determining availability of voice services over IP Multimedia Subsystem (IMS) in at least one of long term evolution (LTE) or global system for mobile communications edge radio access network (GERAN)/universal mobile telecommunications system terrestrial radio access network (UTRAN).
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Citations
28 Claims
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1. A method in a User Equipment (UE) with a first indicator related to voice services in an Evolved Packet System (EPS), the method, performed by at least one processor, comprising:
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receiving, by a receiver of the UE, a Non Access Stratum (NAS) protocol Accept message from a network, wherein the NAS protocol Accept message comprises a second indicator that indicates that the network supports an IP Multimedia Subsystem (IMS) Voice over Packet Switched (PS) session; responsive to the first indicator and the second indicator, determining availability of voice services over IMS wherein determining availability of voice services over IMS further comprises performing an attempt to register with an IMS; and based on a failure of the attempt to register with the IMS, performing, by the UE, a combined Tracking Area Update (TAU), wherein the combined TAU comprises a combined Tracking Area/Location Area (TA/LA) update as a single NAS registration procedure used to attempt to register for both Packet Switched (PS) and Circuit Switched (CS) services. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A User Equipment (UE) with a first indicator related to voice services in an Evolved Packet System (EPS), comprising a processor configured for:
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receiving a Non Access Stratum (NAS) protocol Accept message from a network, wherein the NAS protocol Accept message comprises a second indicator that indicates that the network supports an IP Multimedia Subsystem (IMS) Voice over Packet Switched (PS) session; responsive to the first indicator and the second indicator, determining availability of voice services over IMS wherein determining availability of voice services over IMS further comprises perform an attempt to register with an IMS; and based on a failure of the attempt to register with the IMS, performing a combined Tracking Area Update (TAU), wherein the combined TAU comprises a combined Tracking Area/Location Area (TA/LA) update as a single NAS registration procedure used to attempt to register for both Packet Switched (PS) and Circuit Switched (CS) services. - View Dependent Claims (16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28)
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Specification