Samsung Electronics Co., Ltd.

Korea Advanced Institute of Science and Technology

Korea University Industrial Academic Collaboration Foundation

Chi Sung Bae

Hyo Sun Hwang

Young Jun Hong

Ui Kun Kwon

Chang Mok Choi

Sang Joon Kim

Chang Soon Park

Seung Keun Yoon

Joon Seong Kang

Jae Ho Lee

Seung Ku Kim

Doo Seop Eom

Kun Soo Shin

Dong Ho Cho

Sang Kon Bae

Ho Won Lee

Jin Woo Shin

Woong Sup Lee

Nak Myeong Kim

Kwon Ui Kun Kun

A communication method of a coordinator in a bidirectional event transmission sensor network comprising a sensor node and the coordinator is provided. The method includes sensing, in an uplink section, whether a signal having energy greater than or equal to a predetermined magnitude is received, the signal indicating occurrence of an uplink event detected by the sensor node, and transmitting, to the sensor node in a downlink section, a synchronization packet that is used for receiving the uplink event or for transmitting a downlink event in response to the coordinator detecting the downlink event or sensing the signal having energy greater than or equal to the predetermined magnitude in the uplink section. The bidirectional event transmission sensor network has a structure of a super frame that includes at least one standby slot (SS) including the uplink section and the downlink section.

Method and apparatus of sensor network supporting bidirectional event detection

A biosignal interface apparatus includes a sensor configured to detect a target in contact with the sensor, a position identifier configured to identify a position of the sensor on the target, and a controller configured to control an operation mode of the sensor based on the identified position.

Biosignal interface apparatus and operation method of biosignal interface apparatus

A method and apparatus provide for stable signal demodulation in a communication system. The method and apparatus includes including detecting an erroneous demodulation value based on backward-demodulation of received signals, using a difference between a received signal to be demodulated and a preceding signal of the received signals and correcting the error demodulation value. Alternatively, backward-demodulation is used to confirm received signals.

Method and apparatus for stable signal demodulation in communication system

A gateway and method thereof are provided to communicate with sensor nodes. The gateway includes a generator configured to generate, based on schedule information on a previous uplink interval, response data. The gateway also includes an allocator configured to allocate a subsequent uplink interval to the sensor nodes to generate schedule information on the subsequent uplink interval. The gateway includes a transmitter configured to transmit the response data and the schedule information on the subsequent uplink interval to the sensor nodes.

Sensor node and gateway mutually communicating in wireless sensor network

Provided is a method and apparatus to adaptively set a threshold for signal demodulation. The apparatus and the method include adaptively setting a threshold to demodulate a currently received symbol based on the demodulation value of a previously received symbol based on a comparison value. The comparison value is obtained by comparing a number of previously received symbols having a demodulation value of '0' and a number of currently received symbols having a demodulation value of '1'.

Method and apparatus for adaptively setting threshold for signal demodulation

A device communicating with a node, includes a communication unit configured to transmit a transmitting data segment to the node, and receive a receiving data segment from the node. The device further includes a phase locked loop (PLL) configured to generate an operating frequency for the communication unit. The device further includes a PLL controller configured to control a hold time and a lock time, of the PLL, that are shared between the node and the device. The device further includes a scheduler configured to schedule the transmitting data segment and the receiving data segment based on the controlled hold time and lock time.

Low power communication device for scheduling data segments using hold time or lock time of phase locked loop

A low power radio device and a radio resource sharing method for the low power radio device are provided. In the low power radio device, a channel state (CS) is detected by carrier sensing before transmission of each frame to reduce interference and a need of retransmission of each frame, accordingly, reducing energy consumption.

Low power radio device and radio resource sharing method for low power radio device

A communication device for detecting a collision in an operating frequency band and another frequency band, and a communication method thereof. The communication method includes transmitting or receiving a packet using an operating frequency band. The communication method further includes detecting whether another communication device transmits another packet using another frequency band different from the operating frequency band while the transmitting or the receiving of the packet using the operating frequency band. The communication method further includes ceasing the transmitting or the receiving of the packet using the operating frequency band based on a result of the detection.

Communication device for detecting collision in operating frequency band and another frequency band, and communication method thereof

A minimum energy coding method and apparatus that includes obtaining groups of bits from a bitstream and finding a mapping rule between the groups of bits and codewords that is chosen to maintain a DC balance. For example, the bitstream may be a bitstream corresponding to a biosignal.

Minimum energy coding method and apparatus for performing direct current (DC) balancing in body area network or low power network

A cognitive radio-based wireless communication system and an air interface method in a physical layer and a data link layer, which constitute a cognitive radio-based next-generation wireless communication system. The air interface method for wireless communication in the cognitive radio-based wireless communication system of the present invention is provided in the cognitive radio-based wireless communication system including a base station system and a plurality of mobile station systems. The base station system and a certain mobile station system communicate with each other using an overlay method that uses a spectrum hole. The base station system and the mobile station system switch from the overlay method to an underlay method to communicate with each other when a paying user having high priority performs communication using the spectrum hole.

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Yongin-si, South Korea

Chi Sung Bae