T-mobile Usa, Inc.

T-mobile Innovations LLC

A Karl Corona

Shujaur Rehman Mufti

Saqib Badar

Nassereddine Sabeur

Hsin-Fu Henry Chiang

Muhammad Tawhidur Rahman

Mehul Jayant Shah

Scott Francis Migaldi

Alan Denis MacDonald

Egil Gronstad

Kun Lu

Ayman Zaki

Robert Ara Kondakjian

Joel Lee Arends

Jim Udom

A user equipment (UE) can attempt to register with an IP Multimedia Subsystem (IMS) that includes Call Session Control Functions (CSCFs), such as a Proxy CSCF (P-CSCF), an Interrogating CSCF (I-CSCF), and a Serving CSCF (S-CSCF). In situations in which IMS registration procedures may otherwise fail for the UE, due to an unreachable I-CSCF and/or S-CSCF, a P-CSCF can pseudo-register the UE with the IMS by informing the UE that the UE is registered with the IMS. If the UE attempts to initiate a service via the IMS while being pseudo-registered with the IMS, the P-CSCF can instruct other IMS elements to accept the UE and provide the service to the UE even though the UE is not fully registered with the IMS.

IMS pseudo-registration

Various embodiments comprise a wireless communication network to maintain multimedia sessions in response to bearer failure. In some examples, the wireless communication network comprises Call Session Control Function (CSCF) circuitry. The CSCF circuitry requests a dedicated bearer to serve a requested multimedia session in response to a multimedia session request for a user device received over a default bearer. The CSCF circuitry receives an error message that comprises an error code indicating the dedicated bearer could not be established. The CSCF circuitry determines when the default bearer can support the requested multimedia session based on the error code. The CSCF circuitry maintains the default bearer for the user device and establishes the requested multimedia session over the default bearer when the default bearer can support the requested multimedia session.

Default bearer use for multimedia sessions in wireless communication networks

Methods and systems for restricting communication services over a network. The method includes detecting a Session Initiation Protocol (SIP) register message originating from a specific network Public Land Mobile Network (PLMN) that is included in a restricted PLMN list identified by a P-Access-Network-Information header (P-ANI). The method further includes implementing a policy to remove RCS and presence capability feature tags from a subsequent SIP register message. The lack of feature tags to Serving Call Session Control Function (S-CSCF) will prohibit triggering of Third Party Registration to different application servers.

Providing selective IMS services to endpoints

In a telecommunication network, a Serving Call Session Control Function (S-CSCF) may be coupled with a Fifth Generation (5G) Equipment Identity Register (EIR) via an N17' interface. In some examples, the S-CSCF can use the N17′ interface instead of a diameter protocol for communicating with the 5G-EIR. The S-CSCF can send a request to the 5G-EIR including a Permanent Equipment Identifier (PEI) associated with a user equipment (UE). In response, the S-CSCF can receive identity data indicative of whether the UE is authorized, not authorized, partially authorized, or unknown. Based on the identity data, the S-CSCF can authenticate a user equipment (UE) accessing a network. In some examples, the S-CSCF may route requests between a 5G-EIR and an EIR. In some examples, this authentication step can comprise a second-level authentication to identify stolen or fraudulent devices and to prevent such devices from accessing the network.

Enhanced N17 interface between IMS network and 5G-EIR

When initiating a Voice-over-IP (VoIP) communication session between an originating device (MO) and a terminating device (MT) on a packet-switched network, network components associated with the MO may encounter a failure when preparing resources for the session, such as a failure to establish a dedicated bearer with the MO. This might typically cause the system to abort the session. Instead, the network components are configured to detect the failure and to initiate a handover to a circuit-switched communication network so that the session may be conducted through the circuit-switched communication network. The failure may be detected by a component of a Long-Term Evolution (LTE) Radio Access Network (RAN) of the network, by a Mobility Management Entity (MME) of the network, or by some other network component. Single Radio Voice Call Continuity (SRVCC) procedures may be used to implement the handover.

Packet-switched to circuit-switched handover during VOIP call initiation

Systems and methods for categorizing communication data are described herein. The systems and methods enable an IMS core network to register a user equipment as a 5G-capable device and store communication data in a manner that differentiates the communication data from non-5G devices. Once identified as a 5G-capable device and information that 5G coverage is available is received, the registration message from the user equipment to the IMS core is modified to configure the IMS core to store the communication data as 5G communication data rather than non-5G communication data.

Systems and methods for network categorization

A routing device of a telecommunications network can receive an initiation request of a communication session. The initiation request can include a destination identifier associated with a terminal. The routing device can query a responder for terminal-associated serving-network information. The routing device can then forward the initiation request to a serving network identified by the serving-network information. In some examples, the responder can query a registry for network-attachment information indicating a current media path associated with the terminal. The responder can provide the serving-network information based at least in part on the network-attachment information. In some examples, the destination identifier can include a global name, and the serving-network information can include an associated local name In some examples, the routing device can include an S-CSCF or ISBC, the responder can include an ENUM server, or the registry can include an HSS.

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Maple Valley, WA, United States of America

A Karl Corona