Method and apparatus for retransmitting data in wireless LAN system using visible light communication

A method for retransmitting data when data transmission/reception has failed in a wireless LAN system using visible light communication, the method comprising the steps of:

• searching a received frame for a fast feedback slot allocated for retransmission information by a mobile node when a data transmission/reception failure has occurred;
• if the fast feedback slot is not found, determining whether an uplink slot has been allocated;
• if the uplink slot has been allocated, retransmitting the data transmission/reception that has failed using the uplink slot.

An apparatus for retransmitting data when data transmission/reception has failed in a wireless LAN system using visible light communication, the apparatus comprising:

• a mobile node for searching a received frame via visible light communication for a fast feedback slot allocated for retransmission information when momentary data transmission/reception failure has occurred, for selecting one mini-slot from among a plurality of mini-slots constituting the fast feedback slot, and for transmitting a fast feedback message via visible light communication including information for retransmission to an access point that does not include a specific request for retransmission by using the selected mini-slot without a resource allocation procedure when a plurality of mobile nodes are connected to the access point;
• and
• the access point for receiving the fast feedback slot, for searching the fast feedback slot for a mini-slot including the fast feedback message, for analyzing the fast feedback message included in the mini-slot, and for retransmitting the unsuccessfully transmitted/received data to the mobile node without an additional resource request procedure.