Patent ID: 11924691
Assignee: SAMSUNG ELECTRONICS CO., LTD.
Field: Digital communication (Electrical engineering)
Classification: CPC H | IPC H

Claim 11:
12. The method as claimed in claim 1, comprises:
sending, by the UE, the invite request to the server in the wireless network, wherein Internet Protocol (IP) Multimedia Subsystem (IMS) services are registered over a Wireless Fidelity (Wi-Fi);
detecting, by the UE, that signal quality of Wi-Fi decreases, wherein the UE has prior knowledge that the server does not support the VoNR and the UE is connected with the first network entity;
performing, by the UE, HO from the first network entity to the second network entity;
performing, by the UE, a Wi-Fi to LTE (W2L) HO to continue the call over the Wi-Fi;
sending, by the UE, the service request to the server to perform the HO from the first network entity to the second network entity when the Voice over Wi-Fi (VoWi-Fi) is initiated, the signal quality of the Wi-Fi is weak, and the server does not support the VoNR;
receiving, by the UE, an acknowledgement of the service request from the server and the EPS FB command from the server, a successful EPS FB, wherein the EPS FB command indicates the HO from the first network entity to the second network entity and information regarding the second network entity;
performing, by the UE, a Tracking Area Update (TAU) with the server after connecting to the second network entity and IMS Packet Data Network (PDN) connection HO to the second network entity;
sending, by the UE, a registration request to the server and receives an acknowledgement for the registration request; and
establishing, by the UE, the call over the second network using the dedicated bearer.