Communication system using carrier aggregation, and base station and terminal included in the communication system

A base station of a communication system that uses carrier aggregation communication apparatus, the base station comprising:

• a shared component carrier designation unit to designate a frequency bandwidth that is used for a type 1 terminal and a type 2 terminal as at least one downlink shared component carrier and at least one uplink shared component carrier;
• a dedicated component carrier designation unit to designate at least one frequency bandwidth that is used for the type 2 terminal as at least one downlink dedicated component carrier and at least one uplink dedicated component carrier;
• a broadcast information transmitting unit to transmit the shared broadcast information for the type 1 terminal and the type 2 terminal and the dedicated broadcast information for the type 2 terminal, by using the at least one downlink shared component carrier;
• and
• a component carrier indicator transmitting unit to transmit a dynamic component carrier indicator or a semi-static component carrier indicator for indicating component carriers that are used by the type 2 terminal and the base station
• a processor;
• and
• a memory operably coupled to the processor,
• wherein the processor, when executing program instructions stored in the memory, is configured to:
• cause the communication apparatus to transmit a first message through a first downlink component carrier to a terminal, wherein the first message comprises first information on a second downlink component carrier;
• and
• cause the communication apparatus to transmit data to the terminal through the second downlink component carrier at least based on the first information,
• wherein a first type terminal is not capable of receiving data using two or more component carriers and a second type terminal is capable of receiving data using two or more component carriers, and the terminal is the second type terminal.

An operational method of a type 2 terminal of a communication system that uses carrier aggregation, the method comprising:

• receiving broadcast information transmitted through at least one downlink shared component carrier, the broadcast information including shared broadcast information for a type 1 terminal and a type 2 terminal and dedicated broadcast information for the type 2 terminal;
• extracting each of the shared broadcast information and the dedicated broadcast information according to unique identifier;
• and
• receiving a dynamic component carrier identifier or a semi-static component carrier identifier for identifying component carriers that are used by a base station and the type 2 terminal,
• wherein a frequency bandwidth that is used for the type 1 terminal and the type 2 terminal is designated as at least one downlink shared component carrier and at least one uplink shared component carrier, and at least one frequency bandwidth that is used for the type 2 terminal is designated as at least one downlink dedicated component carrier and at least one uplink dedicated component carrier.

An operational method for a base station that supports carrier aggregation, the method comprising:

• assigning a first component carrier for a type 1 terminal that does not support the carrier aggregation and a type 2 terminal that supports the carrier aggregation;
• assigning at least one second component carrier different from the first component carrier for the type 2 terminal;
• assigning index to the at least one second component carrier;
• transmitting, to the type 2 terminal, information related to location of the at least one second component carrier, information related to bandwidth of the at least one second component carrier, and information related to the index of the at least one second component carrier, and
• transmitting data to the type 2 terminal through the at least one second component carrier.

An operational method for a terminal that supports carrier aggregation, the method comprising:

• receiving assignment for a first component carrier from a base station supporting both a type 1 terminal that does not support the carrier aggregation and a type 2 terminal that supports the carrier aggregation;
• receiving assignment for at least one second component carrier different from the first component carrier from the base station;
• and
• receiving data from the base station through the at least one second component carrier,
• wherein the receiving assignment for the at least one second component carrier comprises receiving, from the base station, information related to index assigned to the at least one second component carrier, information related to location of the at least one second component carrier, and information related to bandwidth of the at least one second component carrier.

A communication method, comprising:

• receiving by a terminal from a base station, a first message through a first downlink component carrier, wherein the first message comprises first information on a second downlink component carrier;
• and
• receiving, from the base station, data through the second downlink component carrier at least based on the first information,
• wherein a first type terminal is not capable of receiving data using two or more component carriers and a second type terminal is capable of receiving data using two or more component carriers, and the terminal is the second type terminal.

A terminal, comprising:

• a processor;
• and
• a memory operably coupled to the processor,
• wherein the processor, when executing program instructions stored in the memory, is configured to:
• cause the terminal to receive, from a base station, a first message through a first downlink component carrier, wherein the first message comprises first information on a second downlink component carrier;
• and
• cause the terminal to receive, from the base station, data through the second downlink component carrier at least based on the first information;
• wherein a first type terminal is not capable of receiving data using two or more component carriers and a second type terminal is capable of receiving data using two or more component carriers, and the terminal is the second type terminal.