Method of supporting communication using two or more radio access technologies and apparatus for same

A method for transmitting measurement information by a user equipment (UE), the method comprising:

• receiving, from a base station (BS) of a first radio network, a first message comprising information of a list of candidate network entities of a second radio network;
• receiving, from the BS, a message including information related to an added data radio bearer (DRB) configured for communication with the second radio network;
• receiving traffic from a network entity of the candidate network entities through the added DRB;
• performing measurements for the list of candidate network entities of the second radio network;
• and
• transmitting, to the BS, the measurement information when a trigger condition is satisfied,
• wherein the trigger condition is based on a first relationship between a measured channel quality of the BS and a first threshold and a second relationship between a measured channel quality of any network entity of the candidate network entities and a second threshold.

A user equipment (UE) for transmitting measurement information, the UE comprising:

• a transceiver;
• and
• a processor, operatively coupled to the transceiver, wherein the processor is configured to:
• control the transceiver to receive, from a base station (BS) of a first radio network, a first message comprising information of a list of candidate network entities of a second radio network;
• control the transceiver to receive, from the BS, a message including information related to an added data radio bearer (DRB) configured for communication with the second radio network;
• control the transceiver to receive traffic from a network entity of the candidate network entities through the added DRB;
• and
• perform measurements for the list of candidate network entities of the second radio network;
• and
• control the transceiver to transmit, to the BS, the measurement information when a trigger condition is satisfied,
• wherein the trigger condition is based on a first relationship between a measured channel quality of the BS and a first threshold and a second relationship between a measured channel quality of any network entity of the candidate network entities and a second threshold.

A method for supporting measurements by a base station (BS) in a first radio network, the method comprising:

• transmitting, to a user equipment (UE) of the first radio network, a first message comprising information of a list of candidate network entities of a second radio network;
• and
• transmitting, to the UE, a message including information related to an added data radio bearer (DRB) configured for communication between the UE and the second radio network,
• wherein the measurements for the list of candidate network entities of the second radio network is performed when a trigger condition is satisfied,
• wherein the trigger condition is based on a first relationship between a measured channel quality of the BS and a first threshold and a second relationship between a measured channel quality of any network entity of the candidate network entities and a second threshold.