Enhanced multimedia call control in next generation mobile communication systems
First Claim
1. A method, comprising:
- transmitting information related to IP Multimedia Subsystem (IMS) from a serving base station to a user equipment (UE) in a Next Generation (NG) serving cell connected to a 5G core network, wherein the information indicates IMS voice over Packet Switched (PS) session is supported over the 5G core network;
receiving an IMS call indication from an IMS server via the 5G core network;
determining whether IMS voice over PS (VoPS) session is supported over the NG serving cell with a predefined Quality of Service (QoS) requirement; and
generating a handover command to the UE upon determining that the current NG serving cell does not support IMS VoPS, wherein the base station triggers a handover for the UE from the current NG serving cell to a target cell that supports IMS VoPS for performing an IMS VoPS call setup.
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Accused Products
Abstract
A network-based solution of supporting IP multimedia subsystem (IMS) call setup in a next generation system (5GS) is proposed. During an attach or registration area update procedure, a serving base station sends an indication to a UE indicating whether IMS voice over PS session is supported or not. Upon receipt of the indication that IMS VoPS is supported, the UE triggers an IMS registration procedure. However, when an MO/MT call happens, the network determines that the UE may be in conditions where voice service is not supported because the network is not able to provide a successful IMS VoPS over the current serving cell connected to 5G core network. The network then triggers a RAT change or a EPS fallback procedure such that the UE is handover to a target cell that supports IMS VoPS.
13 Citations
20 Claims
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1. A method, comprising:
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transmitting information related to IP Multimedia Subsystem (IMS) from a serving base station to a user equipment (UE) in a Next Generation (NG) serving cell connected to a 5G core network, wherein the information indicates IMS voice over Packet Switched (PS) session is supported over the 5G core network; receiving an IMS call indication from an IMS server via the 5G core network; determining whether IMS voice over PS (VoPS) session is supported over the NG serving cell with a predefined Quality of Service (QoS) requirement; and generating a handover command to the UE upon determining that the current NG serving cell does not support IMS VoPS, wherein the base station triggers a handover for the UE from the current NG serving cell to a target cell that supports IMS VoPS for performing an IMS VoPS call setup. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A base station, comprising:
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a radio frequency (RF) transmitter that transmits information related to IP Multimedia Subsystem (IMS) from a base station to a user equipment (UE) in a Next Generation (NG) serving cell connected to a 5G core network, wherein the information indicates IMS voice over Packet Switched (PS) session is supported over the 5G core network; an RF receiver that receives an IMS call indication from an IMS server via the 5G core network; a Quality of Service (QoS) circuit that determines whether IMS voice over PS (VoPS) session is supported over the NG serving cell with a predefined QoS requirement; and a handover circuit that generates a handover command to the UE upon determining that the current NG serving cell does not support IMS VoPS, wherein the base station triggers a handover for the UE from the current NG serving cell to a target cell that supports IMS VoPS for performing an IMS VoPS call setup. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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15. A method, comprising:
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receiving an IP multimedia subsystem (IMS) voice over Packet Switched (PS) session is supported indication by a user equipment (UE) in a next generation (NG) serving cell connected to a 5G core network; performing IMS registration with an IMS server, wherein subsequently the UE is originating or terminating an IMS voice call; receiving a handover command when IMS voice over PS (VoPS) session is not supported over the NG service cell with a predefined Quality of Service (QoS) requirement, wherein the UE handover from the NG serving cell to a target cell that supports IMS VoPS; and generating an IMS voice call setup through the IMS server in the target cell. - View Dependent Claims (16, 17, 18, 19, 20)
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Specification