Electronics and Telecommunications Research Institute

Other

Ktfreetel Co., Ltd

Yeon Seung Shin

Kyung Sook Kim

Byung-Han Ryu

Seung-Kwon Baek

Pyeong Jung Song

Yeong Jin Kim

Sang Chul Oh

Young Jick Bahg

Hyun Seo Park

Jee Hyeon Na

Dae Ik Kim

Jung Mo Moon

Soon Gi Park

Jae Sheung Shin

Gyung-chul Shin

Hyung-Sub Kim

Jae Su Song

DongSeung Kwon

Dae Sik Kim

Eun Seon Cho

Chan Yong Lee

Hyung Sub Kim

Woo Goo Park

Sung Gu Choi

Hyung-sub Kim

JaeSheung Shin

SoonGi Park

Jeehyeon Na

Won Ik Kim

Eung Bae Kim

Sang Woo Nam

Bong Ju Lee

A method of providing a multicast service is provided by a terminal in a terminal-to-terminal direct communication. The terminal transmits a service start request message requesting a start of a multicast service to a multicast server, and receives a service start response message including a result of permitting a start request from the multicast server. The terminal receives, via a base station, resource information of a resource which a multicast coordinator allocates to the multicast service in accordance with a request of the multicast server, and transmits multicast service data based on the resource information.

Method and apparatus for providing multicast service and method and apparatus for allocating multicast service resource in terminal-to-terminal direct communication

Disclosed is a controller managing a base station in a heterogeneous network environment constituted by a macro base station and a small cell base station group, including: a traffic managing unit managing traffic of the small cell base station group; and an operation controlling unit controlling an operation of at least one peripheral base station included in the small cell base station group based on the traffic of the small cell base station group, wherein the small cell base station group includes a center base station and the at least one peripheral base station and the small cell base station group is disposed in a macro cell configured by the macro base station.

Controller for managing base station in heterogeneous network environment and managing method of the controller, and base station managing system

A base station of a carrier aggregation system performs interference control of a first component carrier in which interference exceeds a threshold value among a plurality of component carriers based on an ABS pattern and changes the first component carrier to an available new component carrier, when interference of the first component carrier exceeds a threshold value after the interference control is performed.

Method and apparatus for controlling interference in carrier aggregation system

A cross carrier scheduling method is provided by a terminal. The terminal receives a control element including cross carrier scheduling configuration information from a base station, and sets a scheduling cell of a secondary cell in accordance with the cross carrier scheduling configuration information. The terminal starts to monitor scheduling information of the secondary cell at the scheduling cell from a time predefined between the base station and the terminal.

Cross carrier scheduling method and apparatus

According to an exemplary embodiment of the present invention, a master base station selects a target serving cell in which a state is changed, among the serving cells of at least one slave base station set in the terminal, generates a MAC control element which instructs a state change of the target serving cell, and then directly transmits the MAC control element to the terminal in the case of an uplink asynchronous state between the target slave base station managing the target serving cell and the terminal.

Method and apparatus for activating and deactivating serving cell

A method in which a base station manages information for D2D communication, which is direct communication between terminals, is provided. The base station receives a first message that requests a configuration of a first open discovery service that searches for a first terminal and at least one terminal to perform D2D communication. The base station determines whether a resource to allocate to the first terminal exists. The base station stores first information for providing the first open discovery service based on the determination result.

Method and apparatus for managing information for direct communication between devices

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

A cell search method for a terminal capable of cell search control includes: receiving a message including first cell search information from a macro cell base station that manages a macro cell; updating second cell search information stored in the terminal based on the first cell search information; and searching for an accessible cell based on the updated second cell search information.

Terminal and method for controlling cell searching thereof

An MBMS providing apparatus and an MBMS providing method using the same in a cloud radio access network are provided. The MBMS providing apparatus includes a third layer into which a plurality of network layers providing an MBMS are integrated in the plurality of DUs, and a second layer into which a plurality of datalink layers providing the MBMS are integrated in the DUs. Therefore, the present invention integrates the layers that provide the MBMS in the plurality of DUs, and provide the MBMS by MBSFN synchronization area through the integrated layers. Accordingly, by performing the MBMS by MBSFN synchronization area through respective integrated layers, the present invention can prevent the occurrence of an unnecessary load, thus enhancing the performance of a communication network.

Multimedia multicast/broadcast service providing apparatus and multimedia multicast/broadcast service providing method using the same

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

A base station, a user equipment, and a method for operating a cooperative multipoint (CoMP) transmitter and receiver (Tx/Rx) are disclosed. The operating method includes receiving, from a peripheral cell, precoding matrix index (PMI) information to be used by a user equipment of the peripheral cell, and transmitting the received PMI information to target user equipments allocated with an entire frequency range, among a plurality of user equipments present in a current cell.

Base station and user equipment for performing CoMP transmission and method thereof

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.

Method and system for scheduling subframe in mobile communication relay system

A handover method and apparatus for a mobile terminal using location information in a network of heterogeneous systems are provided. The handover method uses service area map information provided by a location service server in a mobile communication network in which at least one or more heterogeneous wireless network systems are connected through a predetermined network and, includes: receiving service area map information transmitted from the location service server; the mobile terminal determining whether or not the location of the mobile terminal is within the service area map; and if it is determined that the mobile terminal is within the service area map, the wireless terminal selecting an accessible wireless network system and then activating a unit for communicating with a base station of the selected wireless network system. According to the method, a battery consumption problem that occurs by activating all modems when a wireless terminal, which is connected to a predetermined mobile communication system in an environment where a plurality of heterogeneous systems are overlapping each other, is searching for candidate systems in order to perform handover to a heterogeneous network, can be solved. Also, a problem where finding a candidate system is time-consuming can be solved.

Handover method and apparatus for mobile terminal using location information in heterogeneous system network

This present invention relates to a method for managing trunk status of a CDMA mobile communication exchange. A CDMA mobile communication exchange according to the present invention has the logical trunk and physical trunks relation to the trunk status, which respectively are managed in separate subsystems, and handles the physical trunks distributed and implemented in various subsystems as a single route through the use of the logical trunk structure in order to manage it in a single subsystem, such that the easy route management and route data collection are made possible. Further, the duplicate management are made for the trunk status through separate systems, which allows thus program for managing logical trunk status to collect trunk status from subsystem for managing physical trunk status and vice versa. Therefore, an effective management for the trunk status can be accomplished, and the route management and routing functions are further improved.

Growing community of inventors

Daejeon, South Korea

Yeon Seung Shin