Method and apparatus for notifying status of mobile node in a wireless local area network system using visible light communication

An access point comprising:

• a processor in communication with a memory, the memory including code which when accessed by the processor causes the processor to:
• establishing a transmission frame including a plurality of time slots;
• allocate a first predetermined number of time slots in said frame as unallocated time slots and a remaining number of time slots as reserved slots, said unallocated time slots assigned to providing status information of each of a plurality of mobile nodes, and said reserved slots assigned to providing one of a status information and uplink data transmission;
• and
• receiving a visible light signal, represented as a period of “on” times and “off” times, representing said status information regarding a mobile node in one of an unallocated slot and a reserved slot, when the mobile node initially accesses the AP, wherein said “on” period is longer than said “off” period.