Electronics and Telecommunications Research Institute

Ktfreetel Co., Ltd

Yeong Jin Kim

Il Gyu Kim

Dae Ho Kim

Yeon Seung Shin

Jae Young Ahn

Jae Heung Kim

Kyoung Seok Lee

Hee Sang Chung

Hyung Jin Kim

Bing Hui

Seong Chul Cho

Jae Ho Kim

Sang Ho Lee

Mi Young Yun

Daeho Kim

Jee Hyeon Na

Jung Mo Moon

Pyeong Jung Song

Dae Ik Kim

Kook Jin Lee

Chul Min Park

Kyung Sook Kim

Soon Gi Park

Junhyeong Kim

Dae Sik Kim

Jae Sheung Shin

Sun Hwa Lim

Young Jick Bahg

Eun Hee Hyun

Jai Hyung Cho

Hyun Suk Roh

Jun Hwan Lee

Nam Hoon Park

Do Young Kim

Ho Young Song

Hyun Seo Park

Doug Young Suh

Chan Bok Jeong

In Ki Hwang

Gyung-chul Shin

Gosan Noh

Hyung Sub Kim

Jung Sook Bae

Sung Gu Choi

JaeSheung Shin

Seung Que Lee

Seuck Ho Won

SoonGi Park

Min Taig Kim

Don Sung Oh

Sang Woo Nam

Ho Choong Cho

Chul Keun Kim

Sung Moon Shin

Hyungu Hwang

Eun Ju Park

Hyoung Oh Bae

Provided is a method and apparatus that may control a configuration and operation of a network including a base station to support a multicast and broadcast multimedia service in a cellular system and may control an operation of a terminal and the like, and thus, may effectively provide a multimedia service in the cellular system.

Apparatus supporting an MBMS service

A method and a terrestrial base station for receiving an uplink signal. The terrestrial base station is configured to: receive a preamble corresponding to an orthogonal pseudo-noise (PN) sequence of a plurality of the orthogonal PN sequences from an onboard base station in a train; recognize identification (ID) of the onboard base station from the preamble, and allocate a temporary network ID and an uplink grant (UL grant) to the onboard base station; and receive the uplink signal transmitted based on the temporary network ID and the UL grant.

Method and apparatus for receiving uplink signal in train communication network

A method and an apparatus for transmitting a signal by using a plurality of radio units (RUs) to a user equipment (UE). The apparatus is configured to: determine an RU set including at least two RUs of the plurality of the RUs based on a feedback regarding a received strength of a transmission beam formed by the plurality of the RUs, wherein the feedback is received from the UE; determine a distributed precoding matrix of which a diversity order is predetermined based on information about an RU included in the RU set; and perform a precoding based on the distributed precoding matrix and transmitting a precoded signal to the UE through the RU set.

Method and apparatus for transmitting signal using multiple radio units

A radio unit (RU) in a directional communication network establishes a connection with a first antenna among two antennas of a first TE in a first moving object that first enters a serving duration of the RU according to a network access request from the first antenna, and when receiving the network access request from a second antenna among two antennas of a second TE in a second moving object that next enters the serving duration, the RU processes the network access request from the second antenna based on network access priority of the second antenna and network access priority of the first antenna to which the connection is established.

Method and apparatus for controlling network access in directional communication networks

A method for transmitting and receiving a signal using steps of transmitting an uplink signal to a base station in a duration of an uplink pilot time slot (UpPTS) of a special subframe, and waiting for a guard time (GT) before receiving a downlink signal from the base station after the transmission of the uplink signal, and a terminal transmitting and receiving a signal by using the method.

Method and apparatus for transmitting and receiving signal in high speed train communication network

In a wireless communication system in which a plurality of base stations each forming a directional beam in one direction are disposed along a predetermined path, each base station estimates a distance from installed in a mobile body moving along the path if the TE enters a cell area of the corresponding base station; and controls the transmission power using a distance from the estimated TE so that a difference between received signal strength of the corresponding base station and the received signal strength of neighboring base stations measured by the TE in a cell boundary area between the base stations does not exceed a predetermined threshold value.

Method and apparatus for controlling transmission power in wireless communication system

The present invention provides a terminal connection control apparatus, including: a cell position determining unit which provides information on a cell in which a terminal is located; a requested data speed determining unit which figures out a data speed requested by the terminal; and a connection cell control unit which controls a connection cell of the terminal based on cell position information and the requested data speed.

Apparatus of controlling connection for user equipment and method of controlling access for user equipment

Provided is a method of supporting a videoconference between clients through a plurality of media servers under the control of a management server. The method includes requesting a client change, from a first client connected to a first media server, to a second client to be connected to a second media server; generating a mirror session for the second client according to the request for the client change; and stopping a session for the first client.

Method and system for supporting videoconference in distributed telepresence platform

A method of managing a terminal and controlling an interference in a small base station is provided. The small base station, including: an access preamble control unit to assign a unique preamble for each terminal registered in the small base station; a transmitting/receiving unit to receive a random access request message from each of the terminals through the unique preamble, to transmit a reply message to each of the terminals, and to receive information about each of the terminals and a Radio Resource Control (RRC) connection request Message from each of the terminals in response to the reply message; and a terminal verification unit to verify whether each of the terminals is a registered terminal using the information about each of the terminals.

Method of managing terminal and controlling interference in small base station

A method of controlling femtocell interference considering a macrocell is provided. The method of controlling the interference includes a method of setting transmission power of the femtocell and methods of avoiding the interference of the femtocell. The methods of avoiding the interference include a PRB rotation method, a PRB transmission power restriction method, a hybrid method and a UB rotation method. The method of setting the transmission power and the methods of avoiding the interference may be implemented independently or implemented in combination with each other. Hence, according to the present invention, the femtocell itself can control the interference without affecting an interface of an existing macrocell base station and without signaling through the interface with the macrocell.

Method of controlling interference from femtocells in consideration of macrocell

Provided is a base station. The base station includes a transceiver, a frequency allocation unit, and an orthogonal code allocation unit. The transceiver communicates with a terminal. The frequency allocation unit allocates a frequency resource to the terminal through the transceiver. The orthogonal code allocation unit generates an orthogonal code index table including a plurality of orthogonal code combinations, and allocates one of the orthogonal code combinations included in the orthogonal code index table to each terminal, to which the frequency resource has been allocated for a service request of the terminal, through the transceiver not to multiply be allocated. At least one of a plurality of orthogonal codes included in the orthogonal code combination is orthogonal to at least one of a plurality of orthogonal codes included in an orthogonal code combination allocated to another terminal.

Base stations and resource allocation methods thereof

When transmitting a user message, in a call setting period of a base station and a terminal and a radio connection state between a base station and a terminal, whenever a data transmittable channel resource is available, user messages of an amount corresponding to the available channel resource are transmitted. Therefore, user messages can be divided and transmitted according to an available channel in a call setting period.

Method of transmitting user message, terminal and base station using the method

Provided is a method of admission control for a hybrid femtocell in a wireless communication system, in which the method is applied to a wireless communication system including a hybrid femto base station and a core network performing admission control of a mobile station terminal in a femtocell of the hybrid femto base station. The method of admission control for a hybrid femtocell performed by a core network according to an exemplary embodiment of the present invention includes determining whether a mobile station terminal has membership; determining whether speed information of the mobile station terminal exists; and assigning a probability value to the mobile station terminal depending on the membership and the speed information of the mobile station terminal.

Method of admission control for hybrid femtocell

Disclosed are a system and a method for receiving an MBMS broadcasting service. In the present invention, in a mobile communication/wireless communication system, an MBMS service is provided by synchronizing a unicast bearer with a multicast bearer through scheduling information mapping at the time of transmitting a broadcast/multicast service through a unicast. Further, the present invention presents even a method for improving quality of experience (QoE) of the service by providing the MBMS service through the multicast bearer and the unicast bearer simultaneously. According to the present invention, MBMS services of various service qualities can be provided depending on wireless quality of a terminal or the capability of the terminal at the time of providing the MBMS service.

System and method for receiving MBMS broadcasting service

Growing community of inventors

Daejeon, South Korea

Yeong Jin Kim