Electronics and Telecommunications Research Institute

Jae Sheung Shin

Gi Yoon Park

Seok Ki Kim

Ok Sun Park

Eun Jeong Shin

Jin Ho Choi

Jae Heung Kim

Ji Hyung Kim

Mi Young Yun

Yeong Jin Kim

Yeon Seung Shin

Tae Joong Kim

Hyun Seo Park

Soon Gi Park

Kyung Sook Kim

Jung Im Kim

Ae Soon Park

Young Jick Bahg

Young Ha Lee

Woo Ram Shin

Chang Ki Kim

Sung Gu Choi

You Sun Hwang

A repeated transmission method performed by a first communication node may comprise: repeatedly concatenating data to be transmitted to a second communication node by a preset first repetition number; performing channel coding on the concatenated data; generating first data having a resource unit size based on the channel-coded data; repeatedly outputting the first data by a preset second repetition number; and transmitting wireless signals generated according to the repeated output of the first data to the second communication node, wherein the first repetition number and the second repetition number are natural numbers.

Method and apparatus for repetitive signal transmission in wireless communication system

Disclosed are methods and apparatuses for transmitting data using a random access procedure in a communication system. An operation method of a terminal in a communication system includes transmitting a first MsgA including an RA preamble #i and a payload to a base station; receiving, from the base station, a MsgB including information indicating that an RA preamble #k is reserved; and transmitting a second MsgA including the RA preamble #k and data to the base station in a preamble reservation period associated with the RA preamble #k.

Method and apparatus for transmitting data using random access procedure in communication system

An operation method of a terminal in a communication system may include: receiving, from a base station, quality of service (QoS) information for preamble groups and information on preambles belonging to each of the preamble groups; selecting one preamble group from among the preamble groups based on the QoS information and a QoS of the terminal; selecting a preamble within the one preamble group based on the information on preambles belonging to each of the preamble groups; transmitting a first message including the selected preamble to the base station; and receiving, from the base station, a second message that is a response to the first message.

Method and apparatus for random access layered preambles

An operation method of a terminal in a communication system may comprise: receiving, from a base station, basis preamble information and linear combination information; generating a superposed preamble by using the basis preamble information and the linear combination information; transmitting, to the base station, a first message including the generated superposed preamble; and receiving, from the base station, a second message that is a response signal for the first message.

Random access method and apparatus using superposed preambles

An operation method of a terminal may include: receiving, from a base station, an addition value K, information on linear combination coefficient matrices for respective numbers of transport blocks, and configuration information on each linear combination coefficient matrix; dividing a source block into M transport blocks; selecting one linear combination coefficient matrix among the linear combination coefficient matrices based on M; generating (M+K) network coding blocks by performing network coding on the M transport blocks with the selected one linear combination coefficient matrix; and transmitting, to the base station, messages each including one network coding block among the network coding blocks, a control index of the one linear combination coefficient matrix, and a preamble.

Method and apparatus for traffic transmission in communication system

An operation method of a first communication node in a communication system includes receiving a signal from a second communication node; demodulating the signal to obtain LLR values; calculating a first codeword based on the LLR values; selecting error patterns from among all error patterns based on Hamming weights; generating second codewords by applying the first codeword to each of the selected error patterns; and determining a codeword having a highest similarity to the first codeword among the second codewords as an optimal codeword.

Method and apparatus for decoding using soft decision

Disclosed are operation methods of communication node supporting direct communications in network. The operation method may comprise generating control information which includes parameters used for transmitting and receiving data; transmitting, to a second UE, the control information through a physical sidelink control channel (PSCCH); and transmitting, to the second UE, the data through a physical sidelink shared channel (PSSCH) based on the parameters. Therefore, a performance of the network can be enhanced.

Operation method of communication node supporting direct communication in network

Provided are a device-to-device (D2D) group communication method and a device using the same. The method includes transmitting a scheduling request for D2D group communication to a base station, receiving first radio resource information for a status report of D2D data to be transmitted from the base station, transmitting a D2D buffer status report to the base station through a first radio resource, receiving second radio resource information including D2D resource allocation information necessary for the D2D group communication from the base station, and transmitting control information for the D2D group communication including a D2D group identifier (ID) as a device ID and D2D user data to two or more communication partner devices belonging to the D2D group.

Device to-device group communication method and device using the same

A data transmission method is disclosed. A data transmission method for at least one machine type communication (MTC) device constituting an MTC group includes receiving an attach request from the MTC device; determining whether the attach request is a first attach request from the MTC group; and if it is determined that the attach request is a first attach request from the MTC group, establishing a downlink tunnel and an uplink tunnel to be used for data transmission and reception between a GW and a base station using an MTC group identity.

Data transmitting method using machine type communication group based tunneling, and mobile communication system using the same

Disclosed is a mobility management method for use in a cellular mobile communication system. The mobility management method is configured to save radio resources and provide a stable service by detecting a cell in which a dwell time of user equipment (UE) is short as an island cell and performing a direct handover (HO) to an appropriate cell without handing over the UE to the island cell. There are provided three methods including a base station-based method, a UE measurement-based method, and a UE history-based method according to how to measure a dwell time in which the UE stays in a cell, a component in which obtained information is received within a network, and how to process an HO using the information.

Mobility management method for use in cellular mobile communication system

Provided is a subframe scheduling method in which a relay may transmit interval information of a service to a base station, and the base station may modify a location of a subframe based on the interval information, and thereby preventing a quality deterioration occurring due to a retransmission failure. The subframe scheduling method may include: setting and transmitting, by a base station, subframe information; setting and implementing, by a relay, a service based on the subframe information; transmitting, by the relay, interval information of the service to the base station; modifying, by the base station, the subframe information based on the interval information; and transmitting, by the base station, the modified subframe information to the relay.

Growing community of inventors

Daejeon, South Korea

Jae Sheung Shin