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AssigneeT-Mobile USA, Inc.
InventorsSrinivasan Sridharan, Karthik Chandrasekaran, Muhilan Vamadevan
Estimating the term…
Techniques for optimizing terminating access domain selection (TADS) flow for a Fifth Generation (5G) standalone (SA) capable interworking device with legacy Fourth Generation (4G) voice over long term evolution (VoLTE) network are discussed herein. A 5G SA capable user equipment (UE) may receive a voice call from any generation network. To receive a 5G voice call on an IP Multimedia Subsystem (IMS) network, a terminating UE must be currently connected to a 5G SA network. However, the system has to determine the currently connected radio access technology (RAT) type before establishing a connection; otherwise, attempts to establish a 5G NR connection would result in network call completion errors. The system may configure a home subscriber server to receive a TADS request for the terminating UE and return a TADS status.
One or more non-transitory computer-readable media storing computer executable instructions that, when executed, cause one or more processors to perform operations comprising:
A method comprising:
A system comprising:
Dependencies are inferred from the claim text.
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Affiliation to network
Processing or transfer of terminal data, e.g. status or physical capabilities: transfer of terminal data
Interfaces specially adapted for wireless communication networks: inter-networking arrangements
Wireless communication networks
About 14 years 4 months of term left · ends 25 Feb 2041 (estimated)
Modern telecommunication systems include heterogeneous mixtures of second, third, fourth, and fifth generation (2G, 3G, 4G, 5G) cellular wireless access technologies, which may be cross-compatible and may operate collectively to provide communication services. Global Systems for Mobile (GSM) is an example of 2G telecommunications technologies; Universal Mobile Telecommunications System (UMTS) is an example of 3G telecommunications technologies; Long Term Evolution (LTE), including LTE Advanced, and Evolved High-Speed Packet Access (HSPA+) are examples of 4G telecommunications technologies; and New Radio (NR) is an example of 5G telecommunication technologies. Previous 5G NR launches used existing legacy 4G LTE infrastructure in Non-Standalone (NSA) mode, but the next generation system (5GS) is transitioning to use 5G Core (5GC) infrastructure in Standalone (SA) mode.
To take advantage of the multigenerational mix of wireless communication technologies, devices configured for telecommunications are capable of communicating, not only via various types of communication applications but also via various types of networks. These interworking devices enable connectivity between old and new network elements to support the legacy infrastructure and systems while building out the next-generation networks.
The detailed description is described with reference to the accompanying figures. In the figures, the left-most digit(s) of a reference number identifies the figure in which the reference number first appears. The use of the same reference numbers in different figures indicates similar or identical components or features.
FIG. 1 illustrates an example system including user equipment and a telecommunication network configured to optimize terminating access domain selection (TADS) flow.
FIG. 2 is a block diagram of user equipment configured to optimize TADS flow.
Techniques for optimizing terminating access domain selection (TADS) flow for a 5G Standalone (SA) capable interworking device with a legacy network are discussed herein. The 5G SA capable interworking device includes a user equipment (UE) capable of supporting both the legacy network and next-generation network. The UE capable of supporting 5G functions may include a 5G enabled SIM profile, and the SIM profile is associated with a with 5G SA subscriber. For instance, a cellphone having a SIM card with a SIM profile that enables 5G features, and the cellphone user has a subscription with a cellular carrier that provides 5G SA network and services. The legacy network may include a 4G voice over long term evolution (VoLTE) network and/or any previous generation network. The present system may check if a terminating UE is connected to a 5G network that supports voice over NR (VoNR) before attempting to connect a network call. VoNR is supported only the terminating UE is connected to an IP Multimedia Subsystem (IMS) core. By performing the check before attempting to connect the network call, the system avoids unnecessary signal routing.
In some examples, the system may configure a home subscriber server (“subscriber server”) to maintain a subscriber database for subscription-related information to support call flow. The subscriber server may receive a request from an application server (AS) for TADS associated with a 5G SA subscriber. In response to receiving the TADS request, the subscriber server may perform a series of checks to determine if the terminating UE is currently connected to a 5G SA network.
Initially, the subscriber server may check if the terminating UE is registered only on a 5G SA network on a common data repository. The subscriber server may check if an access and mobility management function (AMF) registration for the terminating UE can be found. If found, the subscriber server may determine the AMF registration includes a deregistration callback uniform resource identifier (URI) and a purged status that is not set to true. If the AMF registration cannot be found or additional checks fail, then the subscriber server may avoid performing the remainder checks and respond to the application server with a negative TADS status.