Electronics and Telecommunications Research Institute

Eun Jeong Shin

Gi Yoon Park

Seok Ki Kim

Ok Sun Park

Jae Sheung Shin

Jin Ho Choi

Il Gyu Kim

Hyeong Geun Park

Dae Ho Kim

Gweon Do Jo

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 receiving node may include performing a decoding operation for calculating first and second output transform values corresponding to first and second unit output nodes in each of a plurality of operation units constituting the polar decoder, based on first and second input transform values corresponding to first and second unit input nodes, and the decoding operation may include setting initial values of first and second variables for calculating the first output transform value; performing an iterative loop operation for updating the first and second variables; and calculating the first output transform value based on values of the first and second variables updated until a time when the iterative loop operation is terminated, wherein the iterative loop operation is terminated without performing iterations in which the first and second variables are determined not to be updated among a plurality of iterations.

Decoding method and apparatus based on polar code in communication system

Disclosed is an apparatus and method for detecting a code. The code detecting apparatus may include a detector to detect symbol synchronous timing information associated with a PSS code from a first signal received during a predetermined first period, a compensator to extract and buffer the PSS code and the SSS code based on the symbol synchronous timing information detected from a second signal received during a predetermined second period, and compensate for a frequency offset with respect to the buffered PSS code, and a processor to re-detect the symbol synchronous timing information based on the PSS code in which the frequency offset is compensated for, and extract the buffered SSS code using the re-detected symbol synchronous timing information.

Apparatus and method for detecting code

A method of discovering a neighbor cell, the method including: determining whether a first Primary Synchronization Channel (PSCH) of a first cell in which a terminal is included is identical to a second PSCH of a second cell, and whether timings of the first cell and the second cell are synchronous; estimating third channel information of the second cell based on second channel information of the first cell from first channel information, when the first PSCH is identical to the second PSCH and the timings of the first cell and the second cell are synchronous, the second channel information being estimated using a first Secondary Synchronization Channel (SSCH) of the first cell, and the first channel information being estimated using the first PSCH and the second PSCH; and detecting a second SSCH of the second cell, and detecting a cell identifier (ID) of the second cell using the second SSCH.

Growing community of inventors

Daejeon, South Korea

Eun Jeong Shin