Electronics and Telecommunications Research Institute

Sungkyunkwan University

Ajou University Industry-Academic Cooperation Foundation

Kyung Yul Cheon

Mi Jeong Yang

Ae Soon Park

Aesoon Park

Hyeyeon Kwon

Min Young Chung

Young Bae Ko

Chang Joo Kim

You Sun Hwang

Kwang Ryul Jung

Sueng Jae Bae

Jae Beom Kim

Ja Heon Gu

The present invention provides a method and system for performing distributed channel sensing in which channel information is collected by performing channel sensing according to a channel sensing priority which is determined according to a relative position of a cell to which a wireless connection device belongs from among a plurality of cells which logically partition the zone of the wireless network, and thus the overhead of the channel sensing which is generated in a cognitive wireless multi-hop network environment is reduced, and the transmission failure which occurs when the wireless connection device detects frequencies is reduced.

Method and system of distributed sensing for reducing spectrum sensing overhead in cognitive wireless multi-hop networks

Provided is a machine type communication system including a machine type communication device operating with a battery. The machine type communication system may monitor a residual power of the battery supplying power to the machine type communication device, and may output the monitored residual power to a device of a manager that manages the machine type communication device. Also, a point in time when the residual power of the battery is to be monitored may be determined based on the residual power.

Scheme for monitoring battery of machine type communication device

Disclosed is a method of transmitting and receiving a small amount of uplink data. A method of transmitting uplink data includes detecting uplink data to be transmitted, determining whether or not uplink data transmission is necessary only once, transmitting a service request message including information instructing that a data radio bearer not be generated when it is determined that uplink data transmission is necessary only once, starting a radio resource control (RRC) connection setup process, and performing the uplink data transmission once using a signaling radio bearer without generating the data radio bearer with reference to the information instructing that the data radio bearer not be generated, during the RRC connection setup process, when it is determined that \ uplink data transmission is necessary only once.

Method of transmitting small amount of uplink data and method of receiving small amount of uplink data

Provided is a handover apparatus and method for a terminal based on a received signal strength (RSS) and a radial velocity. The handover method may measure an RSS from a currently accessed base station and RSSs from candidate base stations for handover, may measure a radial velocity with respect to the currently accessed base station and radial velocities with respect to the candidate base stations for handover, and may perform a handover by determining a base station for handover based on the measured RSSs and the measured radial velocities when the RSS from the currently accessed base station is less than or equal to a reference RSS.

Apparatus and method for handover using received signal strength and radial velocity in terminal

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Daejeon, South Korea

Kyung Yul Cheon