Electronics and Telecommunications Research Institute

Industry-Academic Cooperation Foundation, Chosun University

Seokki Kim

Sung Cheol Chang

Chul Sik Yoon

Hyun Jun Lee

Sung Kyung Kim

Won-Ik Kim

Mi Young Yun

Kwang Jae Lim

Soojung Jung

Eunkyung Kim

Hyung Jin Kim

Seungkwon Cho

Jae Sun Cha

DongSeung Kwon

Jihoon Choi

Seokjoo Shin

Young-Ho Jung

Yu Ro Lee

Taegyun Noh

Hyunsu Kim

Mi-Young Yun

Jimin Bae

A communication method in a peer aware communication system and an apparatus for transmitting/receiving using the communication method are provided. A block signal for informing of channel occupation is generated and then is transmitted through an interval in which a message signal including a preamble signal is not transmitted. A subcarrier for the block signal is different from a subcarrier for the preamble signal.

Communication method for preventing signal collision in peer aware communication system and apparatus for transmitting/receiving using the method

A terminal executes a random access procedure with a target base station depending on a pre-random access channel (pre-RACH) command in a handover preparation step executed between a source base station currently accessed by the terminal and the target base station when the terminal receives the pre-RACH command from the source base station through layer2 (L2) signaling in the handover preparation step.

Method and apparatus for handover in wireless communication system

Disclosed are a method and a terminal for a distributed access. The terminal maps data channels to be allocated in a plurality of data channels included in a frame and map scheduling priorities. In this case, the terminal determines positions of resources of a first message as a resource request message and a second message as a response message for the first message in the first channel.

Method and terminal for distributed access

Disclosed herein are a cooperation MIMO transmitting/receiving method and a terminal for supporting the same. A master terminal forms a slave terminal and a cluster performing cooperation communication. The master terminal transmits some data of data to be transmitted to a slave terminal and shares the some data with the slave terminal, and the slave terminal transparently transmits data transmitted from the master terminal to a target node.

Cooperation multi-input multi-output transmitting/receiving method and terminal for supporting the same

A D2D direct communication method is provided. The device sets at least one frame among a plurality of frames included in a superframe to a frame typewhich is sectionized into a synchronization region for performing a synchronization procedure, a discovery region for discovering devices, a peering region for a connection, and a data region for scheduling of resources and data transmission. The device sets remaining frames among the plurality of frames to a frame typewhich is sectionized into the synchronization region and the data region.

Method and apparatus for device-to-device direct communication

A discovery method is provided by a device in a D2D direction communication. The device selects a discovery resource unit from among discovery resource units which are not being used after listening during one or more discovery resource periods. The device transmits a first discovery signal through the selected discovery resource unit in a broadcasting manner at a first discovery resource period, and transmits a second discovery signal through the selected discovery resource unit in a query-based manner at a second discovery resource period.

Discovery method and apparatus in device-to-device direct communication

A synchronization signal transmitting apparatus generates a plurality of different primary synchronization signals that are transmitted in an ultra frame unit within one super ultra frame and generates one secondary synchronization signal that is transmitted in a frame unit within one super ultra frame.

Apparatus and method for transmitting synchronization signal

A signaling method for a terminal that performs direct communication between terminals terminal is disclosed. A transmitting terminal transmits a link establishment request message for establishing a link to a receiving terminal, and the receiving terminal transmits a link establishment response message responding to this message to the transmitting terminal. The link establishment request message includes a field indicating a flow to use if the receiving terminal acquires a token.

Signalling method for direct communication between terminals

Provided are a method for transmitting uplink data by a terminal in a mobile communication system, the method comprising: when data to be transmitted to uplink is generated in an idle mode, transmitting a ranging request message including at least one of a group identifier allocated to each terminal group to which the terminal belongs, an offline transmission indicator indicating transmission of uplink data in a state in which the terminal is not connected to a network, and uplink data, to a base station; and receiving a ranging response message confirming that the uplink data has been successfully transmitted, from the base station.

Method for transmitting uplink data, and base station and terminal supporting the same in mobile communication system

In a direct communication between terminals, a terminal transmits a synchronization channel preamble part after transmitting a synchronization channel message part including synchronization information. The terminal receives a dedicated channel including a direct communication packet after transmitting the synchronization channel preamble part. A transition time gap for switching from transmission to reception may be inserted to an end of the synchronization channel preamble part.

Method and apparatus for transmitting synchronization channel, and method and apparatus for receiving synchronization channel

A communication method of a terminal that can operate in a relay mode or a base station mode is provided. When the terminal, having received a service from a first base station, detects that a service connection to the first base station is unavailable, the terminal searches for a second base station, which is an available neighboring base station. The terminal transmits a ranging request message including a base station identifier of the first base station to the second base station.

Terminal and communication method thereof

Referring to FIG., if the direct communication terminal, among the direct communication terminalsandreceiving a downlink multicast service from the base stationthrough the forwarding terminal, wants to be a talker, the direct communication terminalperforms a unicast connection establishment procedure with the forwarding terminal, in order to transmit an uplink unicast packet.

Method of direct communication between terminals respectively connected and unconnected to base station

A method of managing a resource is provided by a base station. The base station allocates a resource to a terminal, and generates a downlink control channel including information of the allocated resource and a transmission time of a next downlink control channel. Further, the base station transmits the downlink control channel to the terminal.

Method and apparatus for managing resource

A relay, a terminal, and a communication method of the same are provided. The terminal acting as a relay receives a message including scan duration information from a superordinate HR-BS, and the terminal transmits a message including the scan duration information to a subordinate HR-MS. The terminal receives an A-preamble from the superordinate HR-BS according to the scan duration information.

Communication method of relay, terminal, and communication method of the terminal

A permutated channel structure based on a block structure in talk-around direct communication is provided. A dedicated subchannel interferes with only one adjacent dedicated subchannel, even with a large synchronization error, by permutating the dedicated subchannels by cyclic shifts, whereby diversity gain can be maintained and interference between adjacent channels can be minimized.

Growing community of inventors

Daejeon, South Korea

Seokki Kim