| CPC H04W 88/06 (2013.01) [H04L 67/14 (2013.01); H04W 8/08 (2013.01); H04W 48/18 (2013.01); H04W 60/005 (2013.01); H04W 88/16 (2013.01)] | 14 Claims |
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1. A method by a session management function (SMF)/packet data network gateway-control plane (PGW-C) collocated function in a wireless communication system for supporting multi-RAT (radio access technology), the method comprising:
receiving, by the SMF/PGW-C collocated function from a user equipment (UE), a session create request message of a data transmission for a service when the UE dually accesses a first RAT communication system and a second RAT communication system;
determining, by the SMF/PGW-C collocated function, a target communication system to be used for the data transmission for the service between the first RAT communication system and the second RAT communication system, wherein the target communication system is determined based on a UE subscriber class, and system information configured for each service;
transmitting, by the SMF/PGW-C collocated function, a data path setup request message for setting a data path of the data transmission for the service in the target communication system;
receiving, by the SMF/PGW-C collocated function, a data path setup response message corresponding to the data path setup request message; and
transmitting, by the SMF/PGW-C collocated function to the UE, a response message including information related to the data path of the data transmission for the service.
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