Wireless communication system including communication apparatus and data communication method thereof

A wireless communication apparatus comprising:

• a communicator configured to communicate with an external node;
• a storage configured to store a predetermined speed adjusting condition;
• and
• a controller configured to adjust a communication speed for the external node according to a communication state at the external node and the speed adjusting condition,
• wherein the controller performs data retransmission when a data transmission failure occurs, adjusts a data transmission speed when a number of retransmission of a data transmission unit reaches a threshold number stored in the storage, transfers the data transmission unit at the adjusted data transmission speed, and readjusts the adjusted data transmission speed to a basic data transmission speed when the data retransmission is successful, and
• the controller reduces the basic data transmission speed when at least one of a retransmission rate and a number of the transmission failure satisfies a threshold condition stored in the storage.

A communication system comprising:

• a plurality of user terminal devices;
• and
• an access point (AP) configured to communicate with at least one of the plurality of user terminal devices and adjust a communication speed according to a communication state of a user terminal device,
• wherein the AP performs data retransmission when a transmission failure occurs, adjusts a data transmission speed when a number of retransmission of a data transmission unit reaches a predetermined number, transfers the data transmission unit to the user terminal device at the adjusted data transmission speed, and readjusts the adjusted data transmission speed to a basic data transmission speed when the data retransmission is successful, and
• wherein the AP reduces the basic data transmission speed when at least one of a retransmission rate and a number of the transmission failure satisfies a predetermined threshold condition.

A non-transitory computer-readable recording medium having embodied thereon at least one program comprising a command for performing a method of transmitting data, the method comprising:

• adjusting a data transmission speed when a number of retransmission of a data transmission unit reaches a predetermined number, wherein data retransmission is performed when a transmission failure occurs;
• transferring the data transmission unit at the adjusted data transmission speed;
• readjusting the adjusted data transmission speed to a basic data transmission speed when the data retransmission is successful;
• and
• reducing the basic data transmission speed when at least one of a retransmission rate and a number of the transmission failure satisfies a predetermined threshold condition.

A wireless communication apparatus comprising:

• a communicator configured to communicate with an external node;
• a storage configured to store a basic data transmission speed and at least one preset data transmission speed corresponding to a number of data retransmission;
• and
• a controller configured to perform data transmission at the basic data transmission speed, perform data retransmission in response to a transmission failure, and when a number of the data retransmission reaches a threshold number, perform the data retransmission at a preset predetermined speed corresponding to the threshold number.

A wireless communication apparatus comprising:

• a controller configured to control the wireless communication apparatus to implement:
• a first link adaptation (LA) module configured to control a data transmission rate of the wireless communication apparatus based on whether retransmission of data is successful;
• and
• a second link adaptation (LA) module configured to control the data transmission rate of the wireless communication apparatus based on at least one of a data retransmission rate of the retransmission of data and a number of retransmission failures of the retransmission of data.