CPC H04W 36/0016 (2013.01) [H04W 36/0033 (2013.01); H04W 36/08 (2013.01)] | 18 Claims |
1. A method performed by a session management function (SMF) for a handover from a source radio access network (RAN) node to a target RAN node, the method comprising:
receiving, from an access and mobility function (AMF), a first request message including an identifier of a protocol data unit (PDU) session and a target identifier;
transmitting, to the AMF, a first response message including the identifier of the PDU session and session management (SM) information;
receiving, from the AMF, a second request message including tunnel information associated with the target RAN node for the PDU session;
in case of a direct forwarding, transmitting, to the AMF, a second response message including the tunnel information associated with the target RAN node;
in case of an indirect forwarding, transmitting, to a user plane function (UPF), a session modification request message for the indirect forwarding;
receiving, from the UPF, a session modification response message including tunnel information associated with the UPF; and
transmitting, to the AMF, a response message including the tunnel information allocated by the UPF.
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