Electronics and Telecommunications Research Institute

Korea Advanced Institute of Science and Technology

Seung-Hwan Lee

Jae Su Song

Seok Seo

Yunhee Cho

Dong Seung Kwon

Keun Young Kim

Jin Up Kim

Kyu Tae Lee

Jinup Kim

Eung-Bae Kim

Sang Yup Lee

Juyul Lee

Seong Chul Cho

Jin-Up Kim

Nam Il Kim

Eung Bae Kim

Dong J Shin

Seung-Kwon Back

Kim Eung Bae

Shin Eun-Jeong

A system for selecting a wireless resource that is interworked with a terminal and one or more base stations selects a base station for the terminal based on received subjective quality of experience and pre-stored quality reference information and transmits information on the selected base station as wireless resource information to the terminal, when the system receives quality of service (QoS) information, which is objective quality information, of a wireless section and terminal information from the terminal, in order to select any one base station.

System and method for selecting wireless resource

In a cellular communication system including a plurality of cells, a resource allocation apparatus of a base station determines a resource division ratio of a present resource frame using a traffic load of a plurality of cells that are measured for an immediately preceding resource frame and marginal utility of each partition, divides a present resource frame into a plurality of partitions according to the determined resource division ratio, and allocates a plurality of partitions to a user.

Method and apparatus for allocating resource

Provided is a wireless signal receiver including: an analog-digital converter (ADC) converting an analog RF signal into a digital baseband signal; and a sub-sampling block dividing and processing the digital baseband signal into a first path signal and a second path signal, and extracting a complex baseband signal by using a relative sample delay difference between the first and second path signals, wherein the first path signal is a signal obtained by adjusting a sample delay and sampling rate of the digital baseband signal, and the second path signal is a signal obtained by filtering without adjusting the sampling rate of the digital baseband signal.

Sub-sampling receiver

A method and apparatus for a terminal to access a base station in a heterogeneous environment are provided. The terminal acquires RAT (Radio Access Technology) selection criteria based on reference information. Then, the terminal selects, for each service, at least one of multiple transceivers that provide access to the base station according to the RAT selection criteria, and provides the corresponding service by accessing the base station through the selected transceiver.

Method and apparatus for accessing base station by service

Disclosed is a cellular communication system allowing direct communication between terminals within a cell or simultaneous transmission and reception of signals between a base station and the terminals through a repeater to be made by introducing a universal link, and a communication method thereof. The communication method of the cellular communication system includes: transmitting, by a base station, universal link setting information and a transmission control signal to a first terminal within a cell, transmitting, by the base station, the universal link setting information and a reception control signal to a second terminal within the cell, and directly transmitting/receiving, by the first and second terminals, signals through the universal link.

Cellular communication system allowing, by using a universal link, direct communication between terminals or simultaneous transmission and reception of signals between a base station and the terminals

A method and an apparatus for controlling a femtocell base station which can effectively solve an inter-cell interference problem. A method of controlling a femtocell base station according to an exemplary embodiment includes receiving pilot signals from one or more macro cell base stations located in surroundings of a femtocell and measuring intensities of pilot signals, receiving use frequency information and pilot signal transmission power information from one or more macro cell base stations, determining a position of a femtocell within a reference macro cell according to an intensity of a reference pilot signal having a maximum signal intensity among received pilot signals, determining a use frequency of a femtocell according to a position of a femtocell, and determining a transmission power of a femtocell according to use frequency and an intensity of a reference pilot signal of a femtocell.

Method and apparatus for controlling femtocell base station

A multi-band receiver according to an embodiment of the present invention includes an analog-to-digital converter configured to convert multi-band analog radio signals into a digital baseband signal, and a first signal extracting unit configured to generate a first path signal by changing a sampling rate of the digital baseband signal and sample-delaying the digital baseband signal, and generate a second path signal by bypassing the digital baseband signal, wherein the first signal extracting unit extracts a first baseband signal using a group delay difference between the first and second path signals caused by a sample delay difference between the first and second path signals.

Multi-band receiver

A method of connecting base stations by a one-way cooperative channel forming a beam is provided. Since it is possible to determine directions of beams and to distribute power components by small amounts of calculations, it is possible to realize the base stations in a one-way cooperative situation with small expenses. In addition, the base stations according to the exemplary embodiment of the present invention may minimize the influence of interference generated by signals transmitted by other base stations through the one-way cooperative channel and the influence of interference generated by signals transmitted to other terminals.

Method and apparatus for forming beam through one-way cooperative channel

A dynamic resource allocating apparatus of a first base station managing a first cell in a cellular communication system calculates an interference metric of each user terminal received by each user terminal from a plurality of neighboring cells, calculates a coupling factor between the first base station and each neighboring base station of each neighboring cell by using the interference metric and a load of each user terminal, calculates available cell boundary resources of neighboring cells by using the coupling factor with respect to each neighboring base station, and allocates resources by using the cell boundary resources allocated to the first cell and the available cell boundary resources of the neighboring cells.

Method and apparatus for dynamic resource allocation

A dynamic resource allocating apparatus of a first base station that manages a first cell in a cellular communication system including the first cell and a plurality of cells adjacent to the first cell determines time resource division vector in which one time resource division period is formed of a plurality of time division intervals and calculates time resource division vector for maximizing utilities of user terminals in a set up objective function to update the time resource division vector. Among the plurality of time division intervals, a first time division interval is operated by a time resource reuse coefficient 1 for user terminals positioned in center regions of a first cell and a plurality of adjacent cells, and the remaining time division intervals excluding the first time division interval are operated by a time resource reuse coefficient n for user terminals positioned at edges of the first cell and the plurality of adjacent cells.

Method and apparatus for dynamically allocating resource

Disclosed are a multimode terminal that may simultaneously enhance utilization of a device and efficiency of a network by enabling a mobile terminal supporting a plurality of communication schemes to additionally support a relay function, and a method of relaying communication using the multimode terminal. A communication relay method of a multimode terminal according to an exemplary embodiment of the present disclosure includes: searching, by a base station, for terminals that support a plurality of communication schemes; selecting, by the base station from among the searched terminals, a relay terminal that satisfies a predetermined condition for performing a multimode relay function; requesting, by the base station, the relay terminal to perform the multimode relay function; and relaying, by the relay terminal in response to the request of the base station, communication between the base station and a target terminal.

Multimode terminal and method for relaying mobile communication using the same

Provided is a method for providing a service, and a method and an apparatus for allocating a resource in a wireless communication system. Services to be provided to users are divided into one of primary and secondary services based on priority in terms of frequency utilization. A service is provided using frequency channel remaining after being used in the primary service in a time zone when frequency utilization rate of the primary service is a threshold value or less. Accordingly, when service data corresponding to the secondary service are received, a user terminal stores the service data in a storage unit. Then, when the user requests provision of the corresponding service, the user terminal provides the stored service data to the user.

Method for providing service, and method and apparatus for allocating resource in wireless communication system

Provided is a method of operating a smart radio communication system, the method including: collecting information associated with each of a plurality of radio access technologies (RATs) through an access to the plurality of RATs; receiving a type of a service, requested by a terminal, via a first RAT accessing the terminal among the plurality of RATs; selecting an optimal channel based on the collected information and the received type of the service; and transmitting a content corresponding to the service via the selected optimal channel.

Smart radio communication system and method of operating the same

The present invention relates to a method for simultaneously surface expressing a target protein using a cofactor and an enzyme regenerating the cofactor on the cell surface. According to the present invention, it is possible to provide a microorganism capable of simultaneously surface expressing a target protein using a cofactor to transform a biochemical material at a high efficiency and an enzyme generating the cofactor without adding an expensive cofactor in a large amount.

Method for simultaneous display of target protein and cofactor regenerating enzyme on cell surface

The adaptive frequency control apparatus includes: a frequency downstreamer for converting the frequency of the radio frequency signal to a frequency of a defined band according to a reference signal; a frequency error measurer for measuring a frequency error between a frequency of the output signal of the frequency downstreamer and a defined frequency; a loop filter for filtering the frequency error output from the frequency error measurer based on a plurality of operational parameters, the operational parameters being changeable; a differential amplifier for generating a control signal for a voltage control based on the output signal of the loop filter; and a voltage-controlled oscillator for changing the frequency of the reference signal according to the control signal of the differential amplifier.

Growing community of inventors

Daejeon, South Korea

Seung-Hwan Lee