Electronics and Telecommunications Research Institute

Yonsei University

Samsung Electronics Co., Ltd.

Chung Ang University Industry Academic Cooperation

Joong Ang University

Kwang-Soon Kim

Jae-Young Ahn

Kyung-Hi Chang

Yun-Hee Kim

Sang-Hyun Lee

Keum-Chan Whang

Young-Jo Ko

Kyu-Jong Hwang

Seong-Lyun Kim

Jung-Hyoung Kwon

Yung-Soo Kim

Jong Hyun Kim

Byung-Han Ryu

Dong-Ho Kim

Sung-Yoon Jung

Yong-Soo Cho

Jin-Ghoo Choi

Soo-Jung Jung

Yong Soo Cho

Hyo-Yol Park

Dong-Han Kim

Young-Jin Sang

Sok-Kyu Lee

Sang-Boh Yun

Jung-Min Park

Tak-Ki Yu

Tae-Gon Kim

Hee-Soo Lee

Jong-Yoon Hwang

Ye-Hoon Lee

Myeon-Gyun Cho

Jae-Won Kang

Kyung Jun Choi

Ki Jun Jeon

Young-Ju Hwang

Du-Ho Rhee

Suk-Won Ha

Moon Kyu Jo

Xilei Chen

Jin-Bae Park

A scheduling method for grant-free multiple access, and a user terminal for the same are disclosed. The method comprises: (a) a step of receiving, from the user terminal, information on traffic to be served, network information of the user terminal and state information of the user terminal; (b) a scheduling step of forming scheduling groups on the basis of the information received in step (a) and a step of allocating resources to each scheduling group; and (c) providing scheduling information to the user terminal, wherein traffic aggregations for traffic of the terminal are set on the basis of the information on traffic from the terminal, the scheduling groups are formed according to the traffic aggregations, and the scheduling information is provided to each traffic aggregation by which the user terminal is to be served.

Scheduling method for grant-free multiple access, and user terminal for same

Disclosed are method and apparatus for enabling multiple access in a wireless communication system that can enable ultralow latency, ultra-reliable, and high throughput services. The disclosed multiple access method includes: allocating resources for a plurality of user terminals according to space and frequency; performing a discrete Fourier transform on a transmission symbol for each unit of the space, the transmission symbol composed of a plurality of sub-symbols and configured to be transmitted according to the allocated space and frequency resources; and applying a frequency filter and a spatial filter on the Fourier transformation result, and wherein the applying of the frequency filter and the spatial filter comprises: selecting a pulse shaping filter according to an arranged position of the allocated frequency resource for each unit of the space and applying the selected pulse shaping filter on a sample representing a result of applying a Fourier transform on the sub-symbol to a frequency domain.

Method and transmission apparatus for multiple access in wireless communication system

Disclosed are an apparatus and a method for LDPC encoding suitable for highly reliable and low latency communication. The disclosed apparatus comprises: a second inner encoding module for outputting parity bits by means of single parity calculations and accumulation device calculations using bit strings outputted from a first inner encoding module; and the first inner encoding module for outputting a part of the parity bits by means of single parity check calculations for the bits output from a second outer module, and for outputting rest of the parity bit strings by means of single parity check calculations and accumulation device calculations, with a part of the parity bits output by the second inner encoding module as an additional input.

Apparatus and method for LDPC encoding suitable for highly reliable and low latency communication

A central management server for special communication may include: a spectrum sensing information acquisition unit for acquiring spectrum sensing information from spectrum sensing servers; an OP map generation unit for generating an OP value for each channel if there is an access request from a second layer; and a channel allocation unit configured to allocate a channel based on the OP value to a user terminal of the second layer requesting access if there is an access request from the second layer. The channel allocation unit may allocate a channel corresponding to the highest OP value from among the available channels, if there are available channels unused by both a first layer and a lower-level layer, and may select and allocate a channel unused by the first layer but used by the lower-level layer, if there are no such available channels.

Central management server for special communication and access method of the central management server

A scheduling apparatus and method are disclosed. An embodiment of the invention provides a scheduling apparatus that includes: a scheduling group classification unit that classifies user terminals located within a serving cell of a base station into a multiple number of scheduling groups by using large-scale fading information of the user terminals; a transmission power setting unit that sets the transmission power of the user terminals for each of the classified scheduling groups; a scheduling period setting unit that sets the scheduling period for each of the scheduling groups by determining a resource element usage proportion for each of the scheduling groups based on the data rate of each of the scheduling groups and determining the data rate expected for all user terminals; and a resource element allocation unit that allocates resource elements used for each of the scheduling groups according to each of the determined scheduling periods.

Scheduling method and apparatus

Disclosed is a downlink signal configuring method and device, and synchronization and cell search method and device using the same in a mobile communication system. A downlink frame has plural symbols into which pilot subcarriers are distributively arranged with respect to time and frequency axes. Initial symbol synchronization and initial frequency synchronization are estimated by using a position at which autocorrelation of a cyclic prefix of a downlink signal and a valid symbol of the downlink is maximized, and cell search and integer-times frequency synchronization are estimated by using pilot subcarriers included in the estimated symbol. Fine symbol synchronization, fine frequency synchronization, and downlink frame synchronization is estimated by using an estimated cell search result. Downlink frequency and time tracking is performed, cell tracking is performed by using a position set of pilot subcarriers inserted into the downlink frame, fine symbol synchronization tracking and fine frequency synchronization tracking are repeated by using the pilot subcarriers to perform the frequency and time tracking of the downlink frame.

Downlink signal configuring method and device in mobile communication system, and synchronization and cell searching method and device using the same

The present invention relates to an adaptive transmitting device using limited feedback information in a mobile communication system, and a method thereof. According to an exemplary embodiment of the present invention, when the base station transmits a pilot signal to the terminal, the terminal generates channel information by using the pilot signal, generates additional channel information from the channel information, and transmits the channel information and the additional channel information to the base station. The base station determines band allocation, power allocation, and modulation methods for each use by using received feedback information, and transmits modulated traffic data to the terminal according to the determined methods.

Adaptive transmission device using limited feedback information in a mobile communication system, and a method thereof

Disclosed is a random access data transmission system and method using OFDMA. The system includes a scheduling ID into an access grant on a preamble for a random access, and transmits it together with an acknowledgment or a non-acknowledgment of the preamble, a base station uses the scheduling ID to notify the mobile station of a random access data transmittable time and a data transmission channel through a control channel, and the mobile station transmits a preamble in advance. After receiving a transmission assignment instruction corresponding to a scheduling ID through the control channel, the mobile station transmits random access data through an assigned channel.

System and method for transmitting random access data using orthogonal frequency division multiple access

Disclosed is an adaptive transmit and receive method and device in a multiple-antenna wireless communication system. A transmit mode comprises different main transmit modes each of which includes one or both of a sub-transmit mode based on STBC and a sub-transmit mode based on SM. A receiver calculates an STBC performance parameter and a SM performance parameter, and a transmitter uses the parameters to determine a main transmit mode with maximum data rates and select a sub-transmit mode for minimizing power consumption. The transmitter channel-encodes, modulates and antenna-maps input data according to the selected transmit mode, and outputs results to the receiver. The receiver antenna/symbol-demodulates and channel-decodes the received data.

Adaptive transmission and receiving method and device in wireless communication system with multiple antennas

A method and apparatus for transmitting and receiving data in a Base Station (BS) of a communication system are provided. A controller determines a location of a Mobile Station (MS), and determines a transmission/reception scheme for data transmission and reception to/from the MS according to the location of the MS. A transceiver transmits and receives data to/from the MS using the determined transmission/reception scheme. Preferably, the MS is located in any one of a cell's inner region and a cell's outer region, the cell's inner region has a radius which varies according to interference between adjacent cells, and the cell's outer region is a region defined by excepting the cell's inner region from the entire cell region.

Method and apparatus for transmitting and receiving data in a communication system according to a location of a mobile station

A method and an apparatus for transmitting a signal in a communication system are provided. An information vector is encoded according to a Low Density Parity Check (LDPC) encoding scheme, thereby generating an LDPC codeword. Minimum surviving check nodes are reserved for recovery of punctured nodes in the LDPC codeword. A check node is selected having a smallest cost function from among unreserved check nodes. A variable node is selected being unpunctured and having a smallest cost function from among variable nodes connected to the selected check node. The selected variable node is punctured when the selected variable node is not connected to the reserved check node. A stopping set check is performed when the selected variable node is connected to the reserved check node. The variable node is punctured when the stopping set check has been successfully performed. The check node is selected until there remains no variable node to be punctured and puncturing the variable node.

Apparatus and method for signal transmission/reception in a communication system

A system and method for transmitting and receiving signals in a communication system are provided, in which a BS communicates with a first MS located within an inner area of a cell during first and second time periods in TDD and communicates with a second MS located within an outer area of the cell during the first time period in FDD, and an RS detects signals transmitted between the BS and the second MS during the first time period and transmits the detected signals simultaneously to the BS and the second MS during the second time period.

System and method for transmitting/receiving signal in a communication system

Growing community of inventors

Daejeon, South Korea

Kwang-Soon Kim