Wireless lan system and transmission method of data thereof

A wireless communication data transmission method, comprising the steps of:

• storing received data into a corresponding data buffer according to a user priority;
• storing a transmission time when transmitting the stored data;
• driving a timer and determining, when transmitting data, whether a response message is received in response to the data before the timer reaches a specific value;
• calculating a delay time of the data using the stored transmission time, if the response message is not received until the timer reaches the specific value;
• and
• setting a user priority of the data using the calculated delay time to store the data into a data buffer corresponding to the user priority and then to try retransmission.

A wireless communication data transmission method for enhancing quality of service of a wireless communication in contention-based channel access mode, the method comprising the steps of:

• (A) storing a transmission time in a transmission frame to be transmitted;
• (B) transmitting the transmission frame;
• (C) examining whether a response frame is received within a predetermined time period;
• (D) calculating a delay time from the transmission time and setting a user priority of the transmission frame using the delay time, if the response frame is not received within the predetermined time period;
• (E) determining an AC according to the set user priority;
• and
• (F) transmitting the transmission frame to a transmission queue corresponding to the AC.

A wireless communication data transmission method, comprising the steps of:

• calculating a delay time using transmission time information included in received data;
• storing the received data into a corresponding data buffer in consideration of the delay time and a user priority of the received data;
• and
• transmitting data selected in contention mode among data stored in at least one or more data buffers.

A wireless communication data transmission method for enhancing quality of service of a wireless communication in contention-based channel access mode, the method comprising the steps of:

• (a) storing a transmission time in a transmission frame to be transmitted;
• (b) transmitting the transmission frame;
• (c) examining whether a response frame is received within a predetermined time period;
• (d) setting a user priority of the transmission frame according to a priority table if the response frame is not received within the predetermined time period;
• (e) determining an AC of the transmission frame using a delay time calculated based on the user priority and the transmission time;
• and
• (f) transmitting the transmission frame to a transmission queue corresponding to the AC.

A wireless communication data transmission method, comprising the steps of:

• storing received data into a corresponding data buffer according to a user priority thereof;
• having access to a transmission medium to transmit data stored in at least one or more data buffers;
• and
• if data stored in two or more data buffers intend to be simultaneously transmitted, determining data to be preferentially transmitted in consideration of a user priority and a delay time of each data and transmitting the determined data.

A wireless communication data transmission method for enhancing quality of service of a wireless communication in contention-based channel access mode, the method comprising the steps of:

• (I) storing a transmission time in a transmission frame to be transmitted;
• (II) transmitting the transmission frame;
• (III) detecting whether an internal collision occurs between ACs;
• (IV) selecting, by a virtual collision handler, a transmission frame to be transmitted in consideration of the transmission time, if the internal collision occurs between the ACs;
• and
• (V) transmitting the selected transmission frame.