Abstract: An optical repeater in a mobile communication system includes a main hub unit (MHU) and a plurality of repeaters connected to a plurality of access points of the MHU, respectively. Each of the repeaters receives subcarrier information and a signal transmitted from a base station, as optical signals, through the MHU or a different repeater connected thereto, processes only a signal corresponding to a subcarrier allocated to a terminal which has accessed according to the subcarrier information, and transmits the processed signal to the terminal which has accessed. Also, each of the repeaters maps a signal of the terminal which has accessed to a subcarrier allocated to the terminal which has accessed, and transmits the same to the MHU or a different repeater connected thereto.

Abstract: Provided are devices, systems, and methods for wirelessly streaming digital data to an optical disc. Embodiments of the device are designed to enable real time, wireless streaming of data via wireless communication. A user can wirelessly stream data from an electronic device capable of wireless communication, to an optical disc containing a memory, a power supply, a processor, a transceiver, a charging device, and an optical modulator. An optical disc reader can then read the electronic data on the optical disc to process the electronic data in real time.

Abstract: A handheld device includes: a transmitter or receiver of a signal beam for quantum key distribution; and a source of alignment beams that diverge from each other in a pattern that matches sensors on a station containing a receiver or transmitter for the quantum key distribution. The alignment beams from the handheld device are of sufficient intensity to produce on the station visible spots that facilitate manual alignment of the handheld device. The station can measure a position and a direction of respective alignment beams and dynamically steer the signal beam according to the measurements.

Abstract: According to an embodiment of the preset invention, in a sensor terminal that is worn by a person, and detects that respective wearers face each other by the aid of an optical communication, a plurality of optical transmit/receive units each having at least one of a transmission unit that emits the light to transmit data, and a reception unit that receives the light to receive the data is arranged within the housing, and the plurality of optical transmit/receive units is arranged so that light emission axes of the transmission units, or extension lines of light detection axes of the reception units approaches each other.

Abstract: The present invention relates to light-based communication, and more particularly it relates to methods for configuration of at least one remote light-sensing device, to a central light-emitting unit and to a light-sensing device. According to the invention, spatial configuration of remote light-sensing devices (e.g. peripherals such as loudspeakers or light devices), will be achieved by transmission of embedded identifiers or configuration information in light emitted in a plurality of directions from a central light-emitting unit. With a different identifier or different configuration information for each direction of transmission, the directions can be distinguished from each other. The invention enables a user to place remote light-sensing devices in a desired spatial position and the central light-emitting unit will be able to determine location and spatial function, i.e. for example whether the peripheral is an audio device and/or a lighting device.

Abstract: A method and apparatus for providing link establishment in the access segment of the communications network using broadband multi-wavelength LED are disclosed. In one embodiment, such links may be established in point-to-point, point-to-multipoint, multipoint-to-multipoint, or ring format depending on the topology required for optimized access network build-out.

Abstract: An LED light and communication system includes one or more optical transceivers that have a light support having a plurality of light emitting diodes and one or more photodetectors attached thereto, and a processor in communication with the light emitting diodes and the one or more photodetectors. The processor is constructed and arranged to generate a communication signal. The one or more optical transceivers are engaged to a lighting fixture within a building. The one or more optical transceivers are constructed and arranged to communicate with a name tag.

Abstract: Exemplary embodiments may involve hierarchical balloon networks that include both optical and radio frequency links between balloons. An exemplary network system may include: (a) a plurality of super-node balloons, where each super-node balloon comprises a free-space optical communication system for data communications with one or more other super-node balloons and (b) a plurality of sub-node balloons, where each of the sub-node balloons comprises a radio-frequency communication system that is operable for data communications. Further, at least one super-node balloon may further include an RF communication system that is operable to transmit data to at least one sub-node balloon, where the RF communication system of the at least one sub-node balloon is further operable to receive the data transmitted by the at least one super-node balloon and to transmit the received data to at least one ground-based station.

Abstract: A method of controlling consumer devices using an infrared dongle coupled to a mobile device includes receiving power for the infrared dongle from the mobile device. The infrared dongle includes an infrared transmitter coupled to a microcontroller. One or more instructions are received in the microcontroller from the mobile device. The received one or more instructions are generated from codes stored in a memory of the mobile device. In response to the receiving, one or more infrared signals are transmitted via the infrared transmitter to at least one of the consumer devices.

Abstract: A data center for executing a data processing application includes processing units, sub-units or servers. Each of the processing units, sub-units or servers can execute a part or all of the data processing application. The processing units, sub-units or servers are electrical disjoint with respect to data communications, but can communicate with each other over free space optical links.

Abstract: A lighting system includes light fixtures not in communications with and not synchronized with one another, and one or more light sensors. Each light fixture separately emits data encoded visible light including light fixture information encoded therein in a manner that avoids visually perceptible flicker and enables light fixture information emitted by one light fixture to be distinguished from light fixture information emitted by other light fixtures. The light fixture information is encoded into data encoded visible light such that a difference between different levels of the data encoded visible light is indicative of an illumination capability of the light fixture and such that visually perceptible flicker is avoided. Each light sensor separately receives portions of data encoded light visible light emitted by multiple light fixtures and separately determines the identity of and the maximum and present illumination contributions for each light fixture.

Abstract: Apparatuses and methods to detect and emit various infrared (IR) and ambient light signals using an integrated sensor and emitter device. Embodiments include a sensor to sense proximity, to sense IR data signals, and to sense ambient light; and an emitter of an IR proximity signal. The sensor detects the IR proximity signal from the emitter when the apparatus is sensing proximity, detects IR data signals when the apparatus is detecting IR data, and detects ambient light when the apparatus sensing light. The IR data signals may include IR remote control (IR RC) and/or IR data association (IRDA) signals. The signals may be detected simultaneously and may be in different frequency bands. According to embodiments, such an emitter may also emit an IR data signals, such as IR RC and/or IRDA signals. These signals may be emitted simultaneously and may be in different frequency bands.

Abstract: A Universal Serial Bus (USB) dongle may include an optical transceiver having a USB inter face for engagement to an electronic device such as a laptop computer or other USB-configured device. The USB dongle may include a converter or buffering, isolation, modulation or amplification circuitry. The USB dongle sends and receives data signals which may be carried upon an optical transmission as generated by an LED light source which in turn is in communication with a host device such as a network processor. The USB dongle may also include operational amplifiers (op-amps) and transistor amplifiers.

Abstract: Various embodiments include apparatus, systems, and methods including an apparatus comprising a remote operable to receive a non-radio frequency beacon signal, the non-radio frequency beacon signal transmitted within and contained substantially within an approximate line-of-sight transmission space, the non-radio frequency beacon signal including at least one channel information portion, wherein the channel information portion includes information indicating a radio frequency, the remote operable to establish bi-directional communications using the radio frequency designated by the at least one channel information portion.

Abstract: Provided is an information processing system that includes a server and a client device. The server stores identification information and associated content in memory, and transmits the identification information, using light that varies over time as a communication medium. The client device continuously senses and decodes the light varying in time into the identification information, transmits the decoded identification information to the server, receives content transmitted from the server in response to the transmission of identification information, and displays received content. A controller included in the client device detects an operation on the displayed content from an input device, and applies control to transmit process details according to the detection to the server. The server additionally executes the process details transmitted from the client device, and updates the content to content that includes the execution results.

Abstract: A free space optical communication system (FSOCS) comprising a modulating retro-reflector (MRR) to receive an interrogation beam from a transceiver, and to modulate and reflect the interrogation beam. The MRR comprising a transmissive electro-optical polymer (EOP) modulator, a signal generator, and a retro-reflector, wherein the transmissive EOP modulator is to modulate the interrogation beam's polarization, the signal generator is operatively coupled to the EOP modulator and is to supply the modulation signal, and the retro-reflector is to reflect a modulated beam back towards the transceiver.

Abstract: Systems, methods, and a vehicle are disclosed to enable wireless optical communications. A wireless optical transceiver includes transmitter light source configured to transmit a first optical signal at a first wavelength via a first ball lens to generate a distributed first optical signal. The distributed first optical signal is configured to be received by a remote receiver via a first line-of-sight transmission. A detector is configured to receive a focused second optical signal at a second wavelength via a second ball lens. A controller is operably coupled to the light source and to the detector. The controller is configured to receive outgoing data and to generate a first electrical signal configured to modulate the first optical signal to transmit the outgoing data. The controller also is configured to receive a second electrical signal from the detector and to demodulate the second electrical signal to generate incoming data.

Abstract: A method and apparatus for establishing a terahertz link using a multi-element lens array that comprises a liquid lens are disclosed. For example, the method receives detected terahertz signals from one or more detectors, where a liquid lens is deployed with each of the one or more detectors. The method determines, for each of the detected signals, if the detected signal is out of focus, and applies a corrective voltage to each liquid lens that corresponds to a detected terahertz signal that is out of focus, wherein the corrective voltage adjusts a focus of the detected signal. The method measures a signal-to-noise ratio of the detected signals, and establishing a terahertz link via at least one of the detected terahertz signals with a highest signal-to-noise ratio.

Abstract: Infrared control signals are communicated between an infrared remote control unit (16) and an infrared controlled device (18) via network gateways (14). A sub-network of a backbone network (10) is automatically set up prior to transmission of messages. The sub-network comprises a selection of devices coupled to a backbone network (10). The setting up of the sub-network comprises automatically sending out a request from the first one of the network gateways (14) to detect network gateways (14) that indicate ability to transmit infrared control messages prior to transmission of the message and storing information defining the sub-network in the first one of the network gateways dependent to a response to the request.

Abstract: The invention relates to base stations in communication networks. In more particular the invention relates to cellular base stations such as 3G/4G and WLAN base stations. Some or all of the aforementioned advantages of the invention are accrued with a fully photonic base station (200) that powers itself with solar photons, provides radio network access and relays an optical photonic beam (220, 221, 230, 231) through air encoded with the data from radio signals of computer users and mobile phone users to the Internet and the global telecommunication network. A system engineer can build a network with the inventive base stations in a matter of days. He simply walks to the roof of houses and points the optical beams to other base stations in adjacent houses.

Abstract: An LED light and communication system includes at least one optical transceiver, the optical transceiver including a light support and a processor. The light support has a plurality of light emitting diodes and at least one photodetector attached thereto. The processor is in communication with the light emitting diodes and the at least one photodetector, where the processor is constructed and arranged to illuminate at least one of the light emitting diodes to generate a light signal which in turn includes at least one embedded data packet. The at least one embedded data packet communicates global positioning system (GPS) location information.

Abstract: An information communication method includes: setting an exposure time of an image sensor to less than or equal to 1/2000 second so that, in an image obtained by capturing a subject by the image sensor, a stripe bright line parallel to a plurality of exposure lines included in the image sensor appears according to a change in luminance of the subject; obtaining the image including the stripe bright line parallel to the plurality of exposure lines by, using the set exposure time, starting exposure sequentially for the plurality of exposure lines each at a different time; and obtaining information by demodulating data according to, in a pattern of the bright line included in the obtained image, a brightness change in a direction perpendicular to the plurality of exposure lines.

Abstract: A switched wireless system is used to increase the range of peer-to-peer communications. The optically-switched fiber optic communication system includes a head-end unit (HEU) having a switch bank. Cables couple the HEU to one or more remote access points in different coverage areas. The switch bank in the HEU provides a link between the remote access points in the different coverage areas such that devices in the different cellular coverage areas communicate with each other. By using the switched communication system, the range and coverage of communication between devices may be extended such that devices in different coverage areas and devices using different communication protocols can communicate.

Abstract: Proposed is a method for providing additional information to a mobile communication terminal by means of visible light communication in an information display device having an LED backlight unit. For this purpose, the method of the present invention comprises the steps of: receiving, from a mobile communication terminal, a request for additional information on an object in a content image when a content image is being displayed on a screen of an information display device; determining whether or not there exists additional information corresponding to the request; and controlling, if said additional information does exist, the light emission of the LED backlight unit so as to transmit said additional information in the form of visible light to the mobile communication terminal. Further, according to the present invention, it is possible to provide various additional information corresponding to the request from the mobile communication terminal.

Abstract: Methods and systems for relaying an optical signal from a remote control to a remote-controlled device such as a home entertainment device or a security device. Embodiments include at least one optical receiver and a plurality of optical transmitters. The optical transmitter positioned with an unobstructed line-of-sight to the home entertainment device is identified and the data encoded in the optical signal from the remote control is sent to that transmitter. A second optical signal that is substantially identical to the first is then generated at the optical transmitter and communicated to the home entertainment device.

Abstract: A data transmission network comprising: a base comprising: a base light source and a base light detector; a plurality of nodes, each node comprising a node light source and a node light detector; and a plurality of optical fibers arranged to form a optical fiber network. Each optical fiber is arranged to receive light from the base light source, transmit the light received from the base light source to one or more of the node light detectors via an air gap, receive light from one or more of the node light sources via an air gap, and transmit the light received from the node light source(s) towards the base light detector.

Abstract: An electronic device may include wireless circuitry such as infrared sources that control external equipment such as televisions and set-top boxes. An infrared source may be mounted within an electronic device housing in a visually inconspicuous location such as in a connector port. A button may be provided with transparent structures that allow infrared light to pass through the button. A removable accessory port may be provided with an infrared transmitter accessory that allows an electronic device to serve as a remote control device. Portions of an electronic device housing may be provided with thin housing walls or holes that are too small to be noticeable to the naked eye to serve as windows for infrared light. An audio port may serve as an infrared light window. Gasket structures, bezel structures, and the edges of displays and other planar glass members may be used in transmitting infrared light.

Abstract: Embodiments relate to methods, devices, and computer-implemented methods for receiving a modulated signal transmitted from at least one signal emitter. The method can include receiving at least one image that comprises image data representing the modulated signal received as radiation emitted from the at least one signal emitter, wherein the radiation represented in the image data comprises at least one period of the modulated signal and wherein the at least one image was captured by a camera of a computing device while a field of view of the camera was moving relative to the at least one signal emitter; analyzing, by at least one processor, the at least one image; extracting, based on the analyzing, the image data representing the radiation; and determining, from the image data that was extracted, the modulated signal transmitted by the at least one signal emitter.

Abstract: Various embodiments relate to an apparatus that converts between CFP signals and electrical CXP signals. Circuitry compensates for attenuation of a CXP interconnect connected to a CXP transceiver port, and converts between (i) electrical CXP signals of the CXP transceiver port (the electrical CXP signals compliant with the CXP specification), and (ii) CFP signals of the CFP transceiver port (the CFP signals compliant with the CFP specification).

Abstract: An electronically commutated motor (ECM) includes windings, a power switch, an infrared transceiver and an electromagnetic shield. The power switch is configured to provide pulse width modulated (PWM) power signals to the windings and to generate a substantial level of electromagnetic noises at PWM frequencies during its switching operation. The infrared transceiver is configured to communicate with an external device using infrared signals and convert electrical signals from and to infrared signals that carry data. The electromagnetic shield is configured to substantially shield the infrared transceiver from the electromagnetic noises of PWM frequencies from the power switch.

Abstract: Proposed is a light module (110) comprising at least two primary light sources (111,112,113) capable of emitting a primary color light. This allows the light module to emit light having intensity (Y) and color coordinates (x,y) through additive color mixing of the constituent primary colors. The light module further comprises an modulator (115) capable of modulating the primary light sources enabling embedment of data in the light emitted. The modulator (115) is arranged to modulate the color coordinates of the light emitted for embedding the data. This is especially advantageous as the sensitivity of the human eye to changes in color is lower than to changes in intensity. The invention thus advantageously allows embedding the data into the light emitted from the light modules (110) of an illumination system (100) without reducing the performance of its primary function as an aid to human vision.

Abstract: A visible light multiplex communication system is presented which includes identification (ID) information and data information which can be simultaneously transmitted and received to and from a server and a plurality of clients by using visible light. Visible light ID communication and visible light data communication do not interfere with each other in the same space during visible light communication. In addition, data can be efficiently transmitted and received to and from a plurality of ID clients using visible light. In addition, visible light ID communication and visible light data communication can be efficiently performed in a state where interference between clients using different protocols does not occur in the same place. Furthermore, a specific unit that is capable of efficiently transmitting and receiving data to and from a plurality of clients by using visible light can be provided.

Abstract: A visible light communication method and terminal are provided for communicating with a visible light coordinator which discriminates between at least one communication area cell that includes at least one light source and a boundary area positioned between the communication area cell and another communication area cell adjacent to the communication cell area, and which provides time division visible light communication. Data of the visible light communication terminal is received from the visible light coordinator using a first time slot in a first communication area cell determined according to a position of the visible light communication terminal. The visible light coordinator is communicated with using a second time slot assigned from the visible light coordinator, when the visible light communication terminal is located in a boundary area of the first communication area cell. The second time slot has not been assigned to the visible light communication terminal.

Abstract: An indirect optical free-space communications system provides broadband transmission of high-speed data in transportation vehicles such as aircraft. The system includes a transmitter with a light source that can be modulated and a receiver with a photo detector, adapted to receive light that is emitted from the transmitter and to convert it into an electric signal. The transmitter and the receiver are directed onto at least one common surface, which reflects the light emitted from the transmitter before it reaches the receiver. The free space communications system is cellular and includes several cells, each of which has a transmitter and at least one corresponding receiver. The cells are configured in such a way that crosstalk with a respective adjoining cell is prevented. The cells are thus independent of one another.

Abstract: Visible light data communication with a sufficient transmission speed is performed using a general-purpose and cost-advantageous blue-light-excitation-type white LED without using a blue color filter while preventing the element from being damaged. When transmission data is inputted to a driving waveform generation unit (110) in a transmitter (100), the driving waveform generation unit (110) and a multi-gray scale driving unit (120) generate a multi-gray scale driving signal, which is supplied to the blue-light-excitation-type white LED (140) and allows the blue-light-excitation-type white LED (140) to emit light. A light signal outputted from the blue-light-excitation-type white LED (140) is collected by a lens or the like, is made incident into a PD (210) in a receiver (200), and is converted to a current signal. The current signal is converted into a voltage signal in a trans-impedance amplifier (212).

Abstract: Systems and methods for visible light communication are disclosed. In part, illumination devices and related systems and methods are disclosed that can be used for general illumination, lighting control systems, or other applications. The illumination devices synchronize preferentially to the AC mains to produce time division multiplexed channels in which control information can be communicated optically by the same light source that is producing illumination. Such illumination devices preferentially comprise LEDs for producing illumination, transmitting data, detecting ambient light, and receiving data, however, other light sources and detectors can be used. The physical layer can be used with a variety of protocols, such as ZigBee, from the Media ACcess (MAC) layer and higher.

Abstract: In a wireless optical communication system, while a mobile station including a wireless optical transmitting/receiving apparatus, i.e., an optical mobile station (OMS), is mounted in a moving object and moves, the mobile station performs handover from a previous optical base station (OBS) to a new OBS. Here, the mobile station may include at least one OMS, and when the mobile station includes two OMSs, soft handover is performed, and when the mobile station includes one OMS, hard handover is performed.

Abstract: Coded light has been proposed to enable advanced control of light sources and transmit information using light sources. Sequences of channel symbols to drive the light source are determined from sequences of source symbols such that no visible flicker is present in coded light emitted by the light sources. Each source symbol is mapped to a composite channel symbol comprising at least one first channel symbol which may be identical to the current source symbol and at least one second channel symbol which may be a function of the current source symbol and at least one future and/or past source symbol.

Abstract: Systems and methods for visual light communication are provided. The system can include a gateway arranged to convert radio frequency communications into visual light communication signals and an active light relay arranged to exchange visual light communication signals with the gateway. The system also includes a passive light relay arranged to exchange visual light communication signals with the active light relay and a communication device arranged to exchange visual light communication signals with one of the active light relay of the passive light relay.

Abstract: Enhancements in optical beam propagation performance can be realized through the utilization of ultra-short pulse laser (USPL) sources for laser transmit platforms, which are can be used throughout the telecommunication network infrastructure fabric. One or more of the described and illustrated features of USPL free space-optical (USPL-FSO) laser communications can be used in improving optical propagation through the atmosphere, for example by mitigating optical attenuation and scintillation effects, thereby enhancing effective system availability as well as link budget considerations, as evidenced through experimental studies and theoretical calculations between USPL and fog related atmospheric events.

Abstract: A device for connecting a plurality of assemblage-mounted optical transmitters to a plurality of assemblage-mounted optical receivers mounted on a selected side of an assemblage includes a planar frame configured to be coupled to the selected side of the assemblage. A plurality of first redirecting structures is affixed to the planar frame and each is configured to receive a first optical signal from a different assemblage-mounted optical transmitter. Each first redirecting structure transmits a second optical signal, corresponding to the first optical signal, along a preselected path. A plurality of second redirecting structures is affixed to the planar frame and each is configured to receive the second optical signal from a different one of the first redirecting structures. Each of the second redirecting structures transmits a third optical signal, corresponding to the second optical signal, to a different one of the assemblage-mounted optical receivers.

Abstract: In the field of signal processing technologies, a microwave transmission apparatus, a signal processing method and device in a microwave transmission apparatus are provided, which are capable of improving the signal-to-noise ratio of the service signal and the reliability of the communication signal, and increasing the distance between an indoor unit (IDU) and an outdoor unit (ODU). In the technical solutions, a signal processing method in a microwave transmission apparatus includes: directly multiplexing at least a service signal and a non-service signal, and converting the multiplexed electric signal into a multiplexed optical signal; and sending the multiplexed optical signal to an ODU.

Abstract: It is presented a method for transmitting lighting device data. The method comprises the steps of obtaining, in a lighting device, a subset of lighting device data, the lighting device data containing information of the lighting device, transmitting, from the lighting device, using light, the subset of lighting device data, and repeating the above steps until all subsets jointly corresponding to the complete lighting device data have been transmitted. A corresponding lighting device and lighting system are also presented.

Abstract: A transceiver module having integrated eye diagram opening functionality for reducing jitter is described. The transceiver module may include a transmitter eye opener and a receiver eye opener integrated in a single circuit. The transceiver module may also include serial control and various other integrated components. Other functionalities that may be integrated on the transceiver module include loopback modes, bypass features, bit error rate testing, and power down modes.

Abstract: Provided is an apparatus and method for transmitting and receiving data in a visible light communication system, the apparatus including a visible light communication (VLC) transceiver for converting a visible light signal received from a counterpart into an electrical signal and outputting the electrical signal, by using a light receiving device during a reception operation, and converting an electrical signal containing information into a visible light signal and transmitting the visible light signal to the counterpart, by using a light emitting device during a transmission operation, a VLC controller comprising a visible frame engine (VFE) for generating a visible frame and outputting the visible frame to the VLC transceiver, in which the VFE generates the visible frame for transmission to a counterpart during non-transmission of respective frames for communication at a sender and a receiver in order to provide visibility to a communication link, and a host controller for controlling the VLC controller and

Abstract: Methods and apparatus for target identification are disclosed. An example method for target identification disclosed herein comprises establishing an optical communication link with a potential target, transmitting a first signal encoded with a first code to the potential target using the optical communication link, receiving a second signal from the potential target using the optical communication link, extracting a second code from the second signal, and identifying the potential target as a friendly asset based on the second code.

Abstract: A radial optical data interchange packaging comprises a central core; a plurality of central core photo transceivers emerging from an exterior side surface of the central core; a mother board coupled to the central core, wherein the mother board is perpendicularly oriented below and abutting the central core; a plurality of retention slots on the mother board, wherein the retention slots radially extend away from the central core; and a plurality of cards held by the retention slots, wherein each of the plurality of cards comprises a set of card photo transceivers that optically communicate with the central core photo transceivers.

Abstract: Disclosed is a multimedia data transmitter that can transmit multimedia data such as image, voice and control signal whose media are different from each other through an optical transmission medium such as plastic or glass optical cables to a short or long distance area. The multimedia data transmitter includes: a digital signal processing logic, converting multimedia data transmitted in different transmission formats into data of a single transmission format, converting parallel image data into serial image data; an interface control logic, generating a control signal for transmission of the data converted by the digital signal processing logic, interfacing interface data; an optical driver, performing optical transmission of the serial data generated by the digital signal processing logic according to the control signal generated by the interface control logic, processing an optical-to-electrical converted signal.

Abstract: An apparatus comprises a housing, a bearing member, and a transmission system. The housing has a channel in communication with an opening at a first end of the housing and a first surface at a second end of the housing. The first surface is substantially perpendicular to a rotation axis through the channel. The bearing member is capable of rotating in the channel around the rotation axis. The bearing member has a second surface substantially perpendicular to the rotation axis and substantially parallel to the first surface. The transmission system is coupled to the first surface and the second surface. The transmission system has a transmitter and a receiver. The transmission system is capable of emitting an electromagnetic radiation in a beam that is capable of being received by the receiver, while a rotation occurs between the transmitter and the receiver about the rotation axis.

Abstract: A method and an apparatus are provided for guaranteeing terminal mobility in a time division visible light communication system. In resource assignment in a position where the visible light communication terminal changes a cell, the terminal is assigned a resource to be used in a next cell in a cell boundary area from a communication coordinator, thereby guaranteeing the continuous mobility. The visible light communication system informs the terminal of cell boundary notice information for easily informing the terminal of the cell definition so that the terminal can recognize that the terminal is currently located in the cell boundary and is necessary to change the resource.