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

Claim 17:
18. The UE as claimed in claim 17, comprises:
send the invite request to the server in the wireless network, wherein IMS services are registered over a Wi-Fi network;
detect 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;
perform HO from the first network entity to the second network entity;
perform a Wi-Fi to LTE (W2L) HO to continue call over the Wi-Fi network;
send 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 Wi- Fi is weak and the server does not support the VoNR;
receive 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;
perform 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;
send a registration request to the server and receives an acknowledgement for the registration request; and
establish the call over the second network using the dedicated bearer.