Signal exchange equipment and method for time division duplex and frequency division duplex carrier aggregation in wireless communication system

A method for operating a terminal in a wireless communication system, the method comprising:

• transmitting, to a base station, through a first carrier for a primary cell, a first message including, information notifying that the terminal supports time division duplex (TDD), frequency division duplex (FDD), carrier aggregation (CA), using the first carrier based on the FDD and a second carrier based on the TDD, wherein the first message comprises information regarding a supportable combination of frequency bands including a first band among frequency bands used for FDD and a second band among frequency bands used for TDD;
• if the base station determines to configure the terminal to perform the TDD-FDD CA based on the first message, receiving, from the base station, through the first carrier, a second message for indicating to add a secondary cell at the second carrier, wherein the second message comprises an index of the secondary cell and frame configuration information for the second carrier;
• identifying at least one uplink subframe for the second carrier based on the frame configuration information;
• and
• performing the TDD-FDD CA to communicate with the base station without estimating downlink channel on the identified at least one uplink subframe based on the frame configuration information of the second carrier,
• wherein the first carrier is used to perform downlink communications and uplink communications based on the FDD,
• wherein the second carrier is used to perform downlink communications without uplink communications according to the frame configuration information, and
• wherein the downlink data received through the second carrier is received through at least one downlink subframe identified by the frame configuration information.

An apparatus for a base station in a wireless communication system, the apparatus comprising:

• a transceiver configured to:
• receive, from a terminal, through a first carrier for a primary cell, a first message notifying that the terminal supports time division duplex (TDD)-frequency division duplex (FDD) carrier aggregation (CA) using the first carrier based on the FDD and a second carrier based on the TDD, wherein the first message comprises information regarding a supportable combination of frequency bands including a first band among frequency bands used for FDD and a second band among frequency bands used for TDD,
• if the base station determines to configure the terminal to perform the TDD-FDD CA based on the first message, transmit, to the terminal, through the first carrier, a second message for indicating to add a secondary cell at the second carrier, wherein the second message comprises an index of the secondary cell and frame configuration information for the second carrier;
• and
• at least one processor configured to perform the TDD-FDD CA to communicate with the terminal that performs the TDD-FDD CA to communicate with the base station without estimating downlink channel on at least one uplink subframe for the second carrier based on the frame configuration information for the second carrier
• wherein the at least one uplink subframe is identified based on the frame configuration information,
• wherein the first carrier is used to perform downlink communications and uplink communications based on the FDD,
• wherein the second carrier is used to perform downlink communications without uplink communications according to the frame configuration information, and
• wherein the downlink data transmitted through the second carrier is transmitted through at least one downlink subframe identified by the frame configuration information.