Electronics and Telecommunications Research Institute

Samsung Electronics Co., Ltd.

Korea Advanced Institute of Science and Technology

Kt Corporation

Sk Telecom Company, Ltd.

Hanaro Telecom., Inc.

Ktfreetel Co., Ltd

Jee Hwan Ahn

Chul Sik Yoon

Sung Cheol Chang

Won-Ik Kim

Sung Kyung Kim

Hyun-jae Kim

Song In Choi

Sung-Geun Jin

Junghak Kim

Kwang Jae Lim

Kyung Soo Kim

Dong Seung Kwon

Youn Ok Park

Sook Jin Lee

Hun Soon Lee

Choong Il Yeh

Young Jo Bang

Chang Wahn Yu

Il Min Kim

Hyun Jun Lee

Kyung-Soo Kim

Byung-Han Ryu

Byung-Jae Kwak

Chul-Sik Yoon

Hyun-Jae Kim

Jun-Woo Kim

Dae Ho Kim

Geon Min Yeo

Kwang Soon Kim

Ae-Soon Park

Seung Jae Bahng

Kyung Yeol Sohn

Hyeong Sook Park

Hyeong Jun Park

Kanghee Kim

Woo Goo Park

Seok-Heon Cho

Yang Gi Kang

Young Jin Sang

Byung Wan Lim

Man Ho Park

Moon Soo Jang

Jae Kyun Kwon

Ki Seon Kim

Soo Kun Kwon

Hyoung Goo Jeon

Myoung Ho Kim

Kang-Il Ahn

Jae Deug Jang

Ji Hwan Song

Kwang Hoo Kook

Jong Ray Na

Ho-Shin Cho

Youngsuk Suh

Kyungsu Yun

A lawful interception apparatus of a service providing system inquires of a trust server in which a law execution server commissions lawful interception authority whether a terminal that connects to a service connection point is an interception target, determines whether a terminal that connects to a service connection point is an interception target, and if a terminal that connects to a service connection point is an interception target, and the lawful interception apparatus intercepts communication traffic that is related to the terminal.

Apparatus and method for lawful interception

In order to manage a neighbor list of neighboring base stations based on the location of a terminal communicating with a base station of a macrocell with femtocell deployments, the base station divides the macrocell in accordance with a predetermined standard of division, and generates a mobile neighbor advertisement message so as to periodically transmit the generated message to the terminal. At this time, the terminal identifies the current location thereof in the macrocell upon receipt of the pilot signals periodically transmitted from the base station of the macrocell. The terminal obtains information regarding the location of the terminal from the information regarding the femtocells deployed within the respective divided regions and information regarding macrocells neighboring the macrocell through using the mobile neighbor advertisement message to scan base stations.

Method for managing neighbor base station list based on terminal location for efficient cell selection and handoff in macrocell environments with femtocell

A method for managing radio resources of a base station is provided. The method includes evaluating a radio environment between a base station and at least one neighboring base station or a radio environment between the base station and terminals connected to the base station, if the evaluated radio environment does not meet predetermined criteria, selecting a new radio resource, deactivating the existing radio resource, and reactivating the new radio resource. Accordingly, the radio resources can be efficiently managed.

Apparatus for managing radio resources of base station and method for managing the same

A management device of a stopping or moving base station includes: an information acquisition unit that acquires first information about wireless environment from a neighboring base station and that acquires second information about the wireless environment by connecting to a backbone network; a position estimating unit that estimates a position of the neighboring base station based on the first information; and an operation condition selection unit that selects radio resources based on at least one of the first information and the second information.

Device for managing of base station and method for managing thereof

A method and apparatus for measuring a radio environment of a base station is provided. The method includes respectively selecting one or more frames for measuring a radio environment in a first mode in which an Over-The-Air Receiver (OTAR) of the base station is initialized and a second mode in which the OTAR is active, continuously measuring the radio environment based on the selected one or more frames in the first mode and intermittently measuring the radio environment based on the selected one or more frames in the second mode.

Apparatus for measuring radio environment of base station and method for measuring the same

A plurality of location-based service advertisement messages including location information of base stations belonging to each network are broadcasted with different timing in multiple wireless networks. Therefore, a terminal receives only at least on location-based service advertisement message corresponding to an accessible network among the plurality of location-based service advertisement messages.

Method for broadcasting and method for receiving location information of base station

Disclosed is a method for channel estimation and feedback in a wireless communication system that estimates a channel for each transmission antenna using an orthogonal frequency division multiplexing (OFDM) impulse signal. A method for channel estimation in a wireless communication system includes causing a base station to generate a training signal with a specific waveform for each transmission antenna and to transmit the generated training signal to terminals; causing the terminals to acquire a downlink channel impulse response for each transmission antenna of the base station using the training signal transmitted from the base station; causing the terminals to acquire a downlink channel characteristic for each transmission antenna of the base station using the acquired channel impulse response; causing the terminal to feed back the acquired downlink channel characteristic information to the base station; and causing the base station to perform fast Fourier transform (FFT) on the downlink channel information transmitted from the terminals to indirectly acquire full channel status information (CSI).

Method for channel estimation and feedback in wireless communication system

A method for controlling interference between a plurality of neighboring base stations for a terminal by a serving base station of the terminal in a communication system is provided. The method includes receiving interference amount information on a first region of a downlink frame from the terminal, determining an interference amount estimate for the first region based on the received interference amount information, comparing the determined interference amount estimate with an interference amount tolerance for the first region; and transmitting an interference indicator requesting reduction in transmission power for the first region to the plurality of neighboring base stations when the interference amount estimate exceeds the interference amount tolerance.

Method for controlling interference

An access point allocates a resource for ranging to an access terminal included therein, and receives a ranging channel that includes an identifier of the access terminal and a plurality of pilots. The AP checks the access terminal by using the received identifier, and measures a round trip delay of the access terminal based on the received pilots.

Method of allocating resource and method of forming ranging channel

Disclosed are a method for requesting, generating and distributing a service-specific traffic encryption key in a wireless portable Internet system, an apparatus for the same, and a protocol configuration method for the same. In the present invention, a subscriber station sends a Key Request message for requesting a service-specific traffic encryption key to the base station using a PKM-REQ MAC message, and a base station analyzes the Key Request message to generate the requested service-specific traffic encryption key. Subsequently, the base station sends a Key Reply message, including the generated service-specific traffic encryption key, to the subscriber station using a PKM-RSP MAC message. If the base station fails to generate the key, the base station sends a Key Reject message, including a reason for the failure, to the subscriber station.

Method for requesting, generating and distributing service-specific traffic encryption key in wireless portable internet system, apparatus for the same, and protocol configuration method for the same

Provided is a wireless position determining method and apparatus. The wireless position determining includes: a measuring unit that measures a propagation delay tap of a signal received from a transmitting end through a channel; and extractor that extracts delay spread information having various forms based on the propagation delay tap; and an obtaining and calculating unit that obtains a distance between transmission and reception ends based on the delay spread information and calculates a position of a receiving end based on the obtained distance between the transmission and reception ends.

Apparatus and method for determining position

A pattern matching system detects strings contained in a target pattern to be detected within a data stream input by 1-byte data, and detects a regular expression representing the target pattern among regular expressions constructed by the detected strings.

System and method for matching patterns

A self-configuring method of a femtocell base station extracts preambles from signals received from adjacent macrocells and femtocells. Transmission power of the femtocell base station is set using the extracted macrocell preambles. In addition, the preambles of the femtocell base station are selected using the correlation values between the macrocell preambles and the pre-stored femtocell preambles. Moreover, the resources for data transmission of the femtocell base station are allocated considering the adjacent macrocells and the femtocells.

Femtocell base station apparatus and self-configuring method thereof

A method for controlling transmission power in a mobile communication system is provided. According to the method, a serving base station arranges a plurality of terminals in ascending order according to Carrier-to-Interference-and-Noise-Ratios (CINRs) based on the CINR measured by the plurality of terminals, classifies the plurality of terminals in one of a first group and a second group according to the order, allocates a subchannel of a data region corresponding to the first group from among a plurality of data regions included in the uplink frame to a terminal classified as the first group, and allocates a subchannel of a data region corresponding to the second group from among the data regions to a terminal classified as the second group.

Resource allocation and power control method

A method and device for providing reference information for starting scanning a different radio access network to a terminal in a boundary area is provided. A receiver supporting a plurality of access systems includes a receiving circuit for receiving a scanning threshold from a transmitter, a first measuring module for measuring channel quality of a serving cell, and a second measuring module for starting scanning a neighboring cell that is a different radio access network when channel quality of the serving cell is less than the channel quality threshold. The receiver may further include a handover module for performing handover to the neighboring cell when the channel quality of the neighboring cell measured by the second measuring module is greater than that of the serving cell.

Method and device for transmitting scanning start information of different radio access network

Growing community of inventors

Daejeon, South Korea

Jee Hwan Ahn