T-Mobile USA, Inc.

Adnan Rahat

Yasmin Karimli

Gunjan Nimbavikar

Syed Toaha Ahmad

Hsin Fu Henry Chiang

Lin Zhang

Hang Hoi Yau

James J Bae

Jaime Enrique Rodriguez Villate

Shujaur Rehman Mufti

Hsin-Fu Henry Chiang

Nayla Hamade

Ming Shan Kwok

Michael L Kim

Zeinab Mahdavifar

A solution for handling network congestion includes detecting, by a wireless network, a network congestion condition; detecting, by the wireless network, a failed attempt, by a user equipment (UE), to initiate a data session (e.g., a voice over WiFi (VoWiFi) call) over a packet data network (PDN) through the wireless network; transmitting, by the wireless network, to the UE, a notification of network congestion; and transmitting, by the wireless network, to the UE, a retry parameter set including a maximum number of fast retries, a fast retry time interval, and a slow retry time interval. In some examples, the retry parameter set further includes a rate at which the slow retry time interval increases with a value of a slow retry counter, and/or a maximum number of slow retries. In some examples, the retry scheme varies based on the severity of the congestion and/or roaming conditions.

UE retry during network overload

A solution for handling network congestion includes: attempting, by a user equipment (UE), to initiate a data session (e.g., a voice over WiFi (VoWiFi) call) over a packet data network (PDN); receiving, by the UE, a notification of network congestion; based on at least a fast retry timer and a fast retry counter, attempting, by the UE, fast retries up to a maximum number of fast retries at a fast retry time interval; and based on at least none of the initial attempt and the fast retries initiating the data session, attempting, by the UE, slow retries at a slow retry time interval until the data session is initiated or a trigger condition halts the slow retries. In some examples, the UE receives a retry parameter set from the network including the maximum number of fast retries, the fast retry time interval, and the slow retry time interval.

The techniques include receiving a handover request from a user device connected to a first access network and identifying a Non-3GPP Interworking Function (N3IWF) serving the user device. The user device provides to the N3IWF, measurement report indicating network conditions. The techniques further include receiving the measurement report from the N3IWF and determining whether a measurement in the measurement report is above a predetermined threshold. If the measurement is above the predetermined threshold, the handover request is accepted to enable the user device to connect to a second access network.

AMF based handover decision

A user equipment (UE) for handover processes between communication networks includes one or more processors, and one or more non-transitory computer-readable media storing instructions that when executed by the one or more processors, cause the UE to receive, by the UE, first diagnostic information, determine whether to perform a first handover from a first communication network to a second communication network based on a first set of thresholds, the first set of thresholds being based on the first diagnostic information, receive, by the UE, an update of the first diagnostic information, and determine whether to perform a second handover from the first communication network to the second communication network based on an updated first set of thresholds, the updated first set of thresholds being based on the updated first diagnostic information.

Handover processing between communication networks

Techniques are described herein for handling handover requests from a user device. The techniques include receiving a handover request from a user device connected to a first access network and identifying an evolved packet data gateway (ePDG) serving the user device. The user device provides to the ePDG, measurement reports indicating network conditions. The techniques further include receiving the measurement report from the ePDG and determining whether a measurement in the measurement report is above a predetermined threshold. If the measurement is above the predetermined threshold, the handover request is accepted to enable the user device to connect to a second access network.

MME based handover decision

Handling supplementary services offered in association with Internet Protocol multimedia services based on particular policies is described. In an example, server(s) can receive, from a first user device, a policy associated with handling one or more communications directed to a particular identifier. The server(s) can subsequently receive a communication from a second user device, the communication being associated with a header identifying the particular identifier as the intended recipient of the communication. The server(s) can determine whether the policy is to be applied to the communication and, based at least partly on determining that the policy is to be applied to the communication, the server(s) can update the header based at least in part on the policy. The server(s) can transmit the communication based at least in part on the header, thereby transmitting the communication pursuant to the policy.

Header modifications for supplementary services based on policies

Systems, devices, and techniques described herein are directed to network based personal number blocking. In particular, the systems, devices, and techniques can be implemented in networks including user equipment (UE) associated with native numbers and alias numbers, and can include blocking native numbers or alias numbers. Further, users can access a user profile or an application via a UE to assign personal number blocking (PNB) preferences to the various native numbers and alias numbers. Indications of such PNB can be transmitted from a UE to a network device to update a user profile in a central repository or database. If a user activates another UE or otherwise associates additional native numbers or alias numbers, the PNB can be seamlessly applied to the new device or numbers.

Network based personal number blocking

Systems and methods for a user equipment operating in a cellular-preferred mode are disclosed. A user equipment operating in a cellular-preferred mode includes a connection priority order that prefers to connect to a licensed cellular network, if available, before connecting to an unlicensed wireless network. Signal quality thresholds for a connection by a user device to licensed cellular networks and unlicensed wireless networks are selected allowing the user equipment to transfer its connection between a licensed cellular network and an unlicensed wireless network without dropping calls. A user interface provides information to alert a user from inadvertently roaming into a licensed cellular network and incurring additional unnecessary changes. By identifying available licensed cellular networks and unlicensed wireless networks, the user interface allows a user to update the priority order connection preference or to override the selected priority order for connection to a licensed cellular network or an unlicensed wireless network.

Methods and systems for cellular-preferred logic for mobile devices

Header modification for supplementary services

Example techniques described herein can permit network terminals to respond to initialization failures, e.g., failures associated with specific types of access networks. A terminal can receive, from a core network device, an initialization-failure message indicating the core network devices lacks valid information of a particular type, e.g., location information, associated with the terminal. The terminal can enable its information-determining function of the terminal, e.g., a location sensor, and determine information of the type using the information-determining function. The terminal can transmit, to the core network device, an initialization message comprising the first information. In some examples, the initialization message can include a Presence Information Data Format Location Object (PIDF-LO) record indicating the location of the terminal.

Response at network terminal to initialization failure

Wi-Fi calling using a mobile device and an evolved packet data gateway (ePDG) is described herein. For example, a mobile device may determine whether any LTE coverage is available, whether data roaming is available, whether a visited public land mobile network (VPLMN) is available, and whether a DNS query to a visited ePDG (VePDG) is successful. The mobile device may connect to the VePDG responsive to a determination that LTE coverage is available, that data roaming is available, that a VPLMN is available, and that the DNS query to the VePDG is successful. Otherwise, the mobile device may connect to a home ePDG (HePDG).

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Renton, WA, United States of America

Adnan Rahat