Samsung Electronics Co., Ltd.

Symbol Technologies, LLC

Clint F Chaplin

Do-Young Kim

Eun-Tae Won

Jae-Seung Son

Young-Kwon Cho

Tae-Han Bae

Chunhui Zhu

Sun-Gi Gu

Hwa-Joong Kim

An apparatus and method for determining whether to output a visibility frame by a Visibility Light Communication (VLC) device according to a setting of a sleep mode is provided. The method includes receiving a sleep mode request message; and transmitting a response message indicating a sleep mode period in response to the received sleep mode request message, wherein the response message includes information indicating at least one first window period in which data transmission and reception are stopped, information indicating at least one second window period in which data transmission and reception can be performed in a normal state, and setting information for determining whether to transmit a visibility frame during at least a period of the sleep mode period.

Method and apparatus for transmitting visibility frame according to setting of sleep mode in visible light communication system

A method includes receiving a transmitted code via visible light communication from a light source. The transmitted code is decoded using a translation table. The translation table indicates raw data corresponding to the transmitted code as well as a duty cycle corresponding to the transmitted code.

Controlling brightness of light sources used for data transmission

A method and device for determining an output of a visible frame in at Visible Light Communication (VLC) device are provided. A first VLC device determines whether to permit a second VLC device to generate visible frames, and transmits, to the second VLC device, visible frame information indicating whether the second VLC device is permitted to generate the visible frames.

Method and device for determining output of visible frame in visible light communication system

Wireless medium reservation for simultaneous transmission of multiple downlink spatial streams to multiple receiver wireless stations during a multi-user transmit opportunity over a wireless medium, is provided. Such a reservation includes reserving a transmission period for simultaneously transmitting data from a transmitting station to multiple intended receiving stations on multiple downlink spatial streams over a wireless communication medium. Reserving the transmission period includes transmitting a request-to-send (RTS) frame to the multiple receiving stations, the RTS frame including a receiver address (RA) field comprising compressed addresses for the multiple receiving stations.

Method and system for contention avoidance in multi-user multiple-input-multiple-output wireless networks

In a first embodiment of the present invention, a method is provided comprising: receiving a selection of a desired brightness level of a light source; receiving a piece of data to be transmitted via visible light communication using the light source; selecting a duty cycle, described by an encoding scheme, based on the desired brightness level; encoding the data using the encoding scheme, wherein the encoding includes identifying a code corresponding to both the piece of data and the selected duty cycle; and transmitting the identified code via visible light communication using the light source.

Methods and systems are provided for secure switching of a roaming wireless terminal. The system includes a network having a plurality of access points for communicating with a wireless terminal. The network includes a first access point configured to couple with the wireless terminal, and a second access point configured to couple with the wireless terminal. The first access point is further configured to generate a first authentication information with the wireless terminal, and connect the wireless terminal with the network upon an authentication of the wireless terminal based on the first authentication information. The first access point is further configured to transmit the first authentication information to the second access point via the network upon the authentication of the wireless terminal. The second access point is further configured to connect the wireless terminal with the network using the first authentication information. The method includes the steps of generating a first authentication information during authentication of the wireless client with a first access point, broadcasting the first authentication information from the first access point to other access points of the network via the network, and connecting the wireless client with the network at a second access point using the first authentication information.

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San Jose, CA, United States of America

Clint F Chaplin