Abstract:
Disclosed is a light network control method. The light network control method for operating a light network control device including a control device and a plurality of control gears comprises the following steps: the control device transfers the right of using a light network to a first gear among the control gears; the first gear checks if there is data to be transferred to the control device and transfers the data to the control device using the right of using the light network; and when the data transmission is completed, the first control gear transfers the right of using the light network to another control gear.
Abstract:
PURPOSE: A visible light wireless communication method using inverted signals and a device for the same are provided to be applied to communication between vehicles having high external noises and far communication distances using both lamps of a vehicle as two conductive wires in a differential signal mode. CONSTITUTION: A pulse width modulation (PWM) section determination unit (1320) determines the length of an additional PWM section based on brightness information corresponding to headlight, tail light, and brake light from a bright information providing unit (1390) corresponding to a central control unit of a vehicle. A left signal transmission unit (1330) and a right signal transmission unit (1340) generate a transmission signal which is generated by synthesizing a data signal and a PWM signal based on a received data signal and PWM section length information received from the PWM section determination unit. The generated transmission signal is transmitted from a left LED emitting unit (1360) and a right LED emitting unit (1370) according to a signal from a transmission timing determination unit (1350) in order to prevent a transmission timing error. [Reference numerals] (1310) Inverse data signal generation unit; (1320) PWM section determination unit; (1330) Left signal transmission unit; (1340) Right signal transmission unit; (1350) Transmission timing determination unit; (1360) Left LED emitting unit; (1370) Right LED emitting unit; (1380) Transmission data providing unit; (1390) Bright information providing unit; (AA) Data section length calculation unit; (BB) Data section brightness calculation unit; (CC) PWM section length calculation unit; (DD,FF) Data and PWM signal synthesizing unit; (EE,GG) Data and PWM signal transmission unit
Abstract:
PURPOSE: A transmission device using visible ray wireless communication and a method thereof are provided to express various colors without changing a voltage applied to red, green, and blue LED light sources. CONSTITUTION: A color generating unit receives a color index and a brightness index(S1110). The color generating unit determines a color which occupies the highest rate among red, green, and blue to express a corresponding color(S1120). The color generating unit determines a pattern index of a corresponding LED(Light Emitting Diode)(S1130). The color generating unit determines a pattern index of an LED which emits the other colors(S1140). If a pattern index value is valid, a pattern generating unit generates a light source driving signal(S1150,S1160).
Abstract:
PURPOSE: A data communication device using visible light wireless communication and a method thereof are provided to determine interval time of data transmission, thereby performing dimming without encoding/decoding of a transceiving device. CONSTITUTION: A light output setting unit(442) sets the width of a pulse outputted from a light output signal based on receiving device moving speed and dimming information. A message processing unit(444) encodes inputted message data. The message processing unit merges the encoded message data with a light output signal outputted from the light output setting unit. A control signal generating unit(448) sets the cycle of transmitting a light output signal from the message processing unit based on the receiving device moving speed to generate a light output control signal.
Abstract:
PURPOSE: A visual light wireless communication method and a device for the same are provided to minimize the brightness reduction of a visual light source or a light device which is generated by a code for a communication and a demodulation function. CONSTITUTION: A coding and modulating unit(120) code and modulates each bit of a code which will transmits the code by at least one between a first modulating signal and a second modulating signal. The first modulating signal is for enabling light during a unit time in continuous on state. A second modulating signal is for generating the off/on of light within the unit time or generating on/off modification. A visible light source driving unit(130) drives the light by using a first modulating signal or a second modulating signal. The visible light source driving unit performs visible light wireless communication through the light.
Abstract:
PURPOSE: A device and a method for searching device of Bluetooth applications are provided to transfer the query command to Bluetooth module units in processor units and transmit the query command to circumferential Bluetooth devices, thereby searching Bluetooth devices which high speed service is available through existing low speed device search scheme. CONSTITUTION: An application unit(110) generates a command. A Bluetooth device around a device search unit is searched by the command. A stack unit performs initialize process of the Bluetooth device. The stack unit processes the generated command. The first module unit(140) searches the first Bluetooth devices around the instrument search device. The second module searches the second Bluetooth device around the instrument search device.
Abstract:
A device connection method between different buses in an IEEE 1394 bridge network is provided to connect LDs(Legacy Devices), located on different buses, to each other using a plurality of PTs(Portals), which collect device information on an associated local bus through self-ID packets, and a BA(Bridge-Aware device), which acquires specific device information from the PTs. PT #0 of bridge #1 collects and stores information about LD #2, which exists on bus ID #0 to which PT #0 belongs, through the transmission and reception of self-ID packets. Also PT #3 of bridge #2 collects and stores information about LD #4, which exists on bus ID #2 to which PT #0 belongs, through the transmission and reception of self-ID packets. Afterwards, BA #1 requests PT #0 of bridge #1 and PT #3 of bridge #2 to provide information about LD #2 and information about LD #4 respectively. Based on the provided information, the BA #1 connects LD #2 with LD #4.
Abstract:
A wireless communication system having a protocol structure for improving latency of a cellular system is provided to carry out partition of data units according to AMC(Adaptive Modulation and Coding) options, so that overhead of packet data is reduced, consequently radio resources can be effectively used. A network layer(430) receives user data from an upper layer. A data link layer(420) determines a data transfer mode based on QoS(Quality of Service) of the user data, and partitions the user data into a lot of packet data according to the determined data transfer mode. A physical layer(410) transmits the packet data to a wireless channel. A control service access point is configured to deliver control information between the data link layer(420) and the physical layer(410).