公开(公告)号：US20220369197A1

公开(公告)日：2022-11-17

申请号：US17719703

申请日：2022-04-13

Applicant: MEDIATEK INC.

Inventor： Rohit NAIK ,  Shu-Lin YANG ,  Hao-Chen CHOU

IPC: H04W36/36 ,  H04W36/14 ,  H04W36/30

Abstract: A method for enhanced call control using User Equipment (UE)-triggered fallback procedure is provided. A UE starts a guard timer in response to initiating or receiving an Internet Protocol (IP) Multimedia Subsystem (IMS) call in a mobile communication network which utilizes a first Radio Access Technology (RAT). The UE determines whether a condition for call continuation in the mobile communication network is met when the guard timer expires. The UE triggers a fallback from the first RAT to a second RAT in response to the condition for call continuation in the mobile communication network not being met.

公开(公告)号：US20220014569A1

公开(公告)日：2022-01-13

申请号：US17368971

申请日：2021-07-07

Applicant: MEDIATEK INC.

Inventor： Shu-Lin YANG

IPC: H04L29/06 ,  H04W4/16

Abstract: A first UE receives a first Session Initiation Protocol (SIP) INVITE message requesting the first UE to place the RTT call on hold, during an ongoing Real-Time Text (RTT) call with a second UE. In response to the first SIP INVITE message, the first UE sends a first SIP 200 OK message to the second UE, and the first SIP 200 OK message indicates that the first UE is not allowed to send and receive media data. After sending the first SIP 200 OK message, the first UE receives a second SIP INVITE message requesting the first UE to resume the RTT call. In response to the second SIP INVITE message, the first UE sends a third SIP INVITE message to the second UE, and the third SIP INVITE message indicates that the first UE is allowed to send and receive media data.

公开(公告)号：US20230007053A1

公开(公告)日：2023-01-05

申请号：US17365041

申请日：2021-07-01

Applicant: MEDIATEK INC.

Inventor： Rohit NAIK ,  Chieh-Fu CHIU ,  Shu-Lin YANG ,  Ssu-Hsien WU

IPC: H04L29/06

Abstract: A User Equipment (UE) including a wireless transceiver and a controller is provided. The wireless transceiver performs wireless transmission and reception to and from a mobile communication network. The controller determines whether the mobile communication network supports IMS services. The controller establishes a Packet Data Network (PDN) connection or a Protocol Data Unit (PDU) session with the mobile communication network for the IMS services via the wireless transceiver in response to the mobile communication network supporting the IMS services. The controller sends application data on the PDN connection or PDU session via the wireless transceiver.