Evolved packet system fallback handling
AssigneeT-Mobile Innovations LLC
InventorsNarayanan Govindan KASI, Saravana Kumar VELUSAMY
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Abstract
Systems and methods are provided for optimizing evolved packet system (EPS) fallback handling in telecommunication networks. The system ensures voice call continuity during transitions from 5G to 4G when data session setup is delayed or fails. It detects EPS fallback at an IP multimedia subsystem (IMS) session management function (SMF), receives a context request from an access and mobility management function (AMF), and sends an IMS context response with an EPS fallback flag. The AMF forwards the request to both IMS and data SMFs, prioritizing the IMS response. If the data response is not received within a set time, the AMF uses the IMS context alone and forwards it to the mobility management entity (MME), which prioritizes IMS setup.
Claims20
A method for ensuring voice call continuity during evolved packet system (EPS) fallback in a telecommunication network, the method comprising:
- receiving, at an access mobility management function (AMF), a context request from a mobility management entity (MME) for a user device;
- forwarding the context request to a an IP multimedia subsystem (IMS) session management function (SMF) and a data SMF;
- receiving an IMS context request response from the IMS SMF, the IMS context request response including an evolved packet system fall back (EPSFB) flag;
- determining, after a pre-determined period of time, that a data context request response has not been received from the data SMF;
- and
- forwarding the IMS context request response to the MME.
A method for optimizing evolved packet system (EPS) fallback handling in a telecommunication network, the method comprising:
- detecting at an IP multimedia subsystem (IMS) session management function (SMF), an EPS fallback condition for a user device;
- receiving, at the IMS SMF, a context request from an access and mobility management function (AMF);
- and
- based on the EPS fallback condition, communicating to the AMF, an IMS context response, the IMS context response including an EPS fallback flag.
A system for optimizing EPS fallback handling in a telecommunication network, comprising:
- an IP multimedia subsystem (IMS) session management function (SMF) configured to:
- detect an EPS fallback condition for a user device requiring a transition from a 5G network to a 4G network;
- receive a context request from an access and mobility management function (AMF);
- and
- communicate an IMS context response to the AMF, the IMS context response including an evolved packet system fall back (EPSFB) flag;
- the AMF configured to:
- forward the context request to the IMS SMF and a data SMF;
- receive the IMS context response from the IMS SMF;
- determine, after a pre-determined period of time, that a data context request response has not been received from the data SMF;
- and
- after the period of time, forward the IMS context response,
- including the EPSFB flag, to a mobility management entity (MME).
Dependencies are inferred from the claim text.