Patent ID: 8594509

Claim:
A method for arranging communication links in visible light communication, the method comprising: synchronizing, by a visible light communication (VLC) exchange identification (XID) frame, a transmission timing of a primary device and a secondary device in an allocated time slot, and a securing time so as to allow the primary device and the secondary device to perform an operation required for transmitting data; transmitting an XID command frame from the primary device to the secondary device and transmitting an XID response frame from the secondary device receiving the XID command frame to the primary device; and filling remaining space of the allocated time slot with a visibility field to increase visibility of the remaining space of the allocated time slot after receiving the XID command frame or the XID response frame, wherein the visibility field comprises a plurality of sub-fields, which include a length sub-field, a pattern sub-field, and a data sub-field wherein the length sub-field defines a length of a visibility field, as a length value of a maximum of two bytes, and includes transmitting the defined value to the data sub-field.