Method and system for transmitting and receiving data in a heterogeneous communication system

An apparatus for providing a communication service in a heterogeneous communication system, the apparatus comprising:

• a controller configured to determine whether a load of traffic occurs in a first communication system providing a first communication service, if a communication path for providing the first communication service to a terminal is generated;
• a transmitter configured to transmit a first request message indicating that the terminal is required to receive the first communication service over a second communication system, to an interworking unit configured to perform interworking between the first communication system and the second communication system providing a second communication service, if the load of traffic occurs in the first communication system, the interworking unit comprising a medium access control (MAC) layer and a physical layer associated with each of the first and second communication systems, and a bridge connecting the MAC layer and the physical layer associated with one of the first and second communication systems;
• a receiver configured to receive a response message corresponding to the first request message from the interworking unit;
• and
• an allocator configured to allocate an internet protocol (IP) address of the second communication system to the terminal according to the response message.

A method for providing a communication service by an interworking unit in a heterogeneous communication system, the method comprising:

• if a load of traffic occurs in a first communication system providing a first communication service, receiving a first request message indicating that a terminal is required to receive the first communication service over a second communication system providing a second communication service, from a first controller of the first communication system;
• transmitting a second request message to a second controller of the second communication system, the second request message indicating that the second controller is required to provide the first communication service to the terminal;
• if a response message corresponding to the second request message is received from the second controller, transmitting the response message to the first controller and controlling the first controller to provide the first communication service to the terminal over the second communication system according to the response message, and
• if the first communication service is received from the second controller, transmitting, to the first controller, the first communication service using a medium access control (MAC) layer and a physical layer associated with the first communication system, wherein an interworking unit comprises a MAC layer and a physical layer associated with each of the first and second communication systems.

An apparatus for providing a communication service, the apparatus comprising:

• a receiver configured to receive a first request message indicating that a terminal is required to receive a first communication service over a second communication system providing a second communication service, from a first controller of a first communication system providing the first communication service, if a load of traffic occurs in the first communication system;
• a transmitter configured to transmit a second request message to a second controller of the second communication system, the second request message indicating that the second controller is required to provide the first communication service to the terminal, and transmit the response message to the first controller, if a response message corresponding to the second request message is received from the second controller;
• and
• a controller configured, if the response message corresponding to the second request message is received from the second controller, to control the first controller to provide the first communication service to the terminal over the second communication system according to the response message, and if the first communication service is received from the second controller, transmit, to the first controller, the first communication service using a medium access control (MAC) layer and a physical layer associated with the first communication system, wherein an interworking unit comprises a MAC layer and a physical layer associated with each of the first and second communication systems.