Abstract:
본 발명은 다수의 주파수 공유 장치를 관리하는 상호공존 관리 시스템에서의 각 개체들의 동작 방법에 관한 것이다. 각 개체(CE, CM, CDIS)의 동작들을 수행하기 위해, 개체의 상태 머신을 Inactive(비활성), Active(활성), Waiting engagement(상호동작 대기), Engaged(상호동작), Request sent(요청 전송) 및 Request received(요청 수신) 상태로 정의한다.
Abstract:
The present invention relates to a practical interference alignment method using multiple antennas in a multi-cell overlapping environment. The channel information needed to configure a signal processing filter for each transceiver node is restricted to local CSI. Moreover, each transceiver node can design its own signal processing filter using the local CSI and apply the signal processing filter in an environment where a normal number of transmission and reception pairs exist.
Abstract:
Provided are an apparatus and a method for determining the identity of a wireless LAN system occupying a channel using information within a signal field or time synchronization between target channels. Therefore, the present invention includes: a preamble detecting unit configured to detect a preamble in each channel; a channel information obtaining unit configured to obtain reference time information when the preamble is detected in each channel, or to obtain signal field information in each channel using the detected preamble; and an identity determining unit configured to determine the identity of the wireless LAN system occupying each channel by comparing the reference time information obtained in each channel, or by comparing the signal field information obtained in each channel.
Abstract:
인지 무선 시스템에서의 스펙트럼 센싱 방법, 전송휴지기간 배치 방법, 이를 위한 단말, 기지국 및 슈퍼프레임 구조가 개시된다. 이 방법은 기지국과의 통신을 수행하는 통신 단계; 및 상기 인지 무선 시스템에서 사용되는 주파수채널들의 전송휴지 기간마다, 상기 전송휴지기간을 갖는 주파수채널에 대한 스펙트럼 센싱을 수행하는 센싱 단계를 포함하고, 상기 각 주파수채널들의 전송휴지기간은 서로 중첩되지 않음을 특징으로 한다. 본 발명에 따르면, 인지 무선 시스템에서 원래 사용자(Incumbent User)의 출현여부 검출의 신뢰도를 높일 수 있다.
Abstract:
PURPOSE: A data transceiver, a data transceiving antenna, a sharing method between a sensing receiver and a sensing antenna, and a wireless communication system are provided to improve the use efficiency of the transceiver and the antenna through smooth sharing of each transceiver and antenna. CONSTITUTION: In case a current time section is a data transceiving section, a data transceiver transmits and receives data(410,420). In case the time section is a QP(Quiet Period), the data transceiver receives inband sensing data with a sensing receiver(430,440). In case the time section is not the QP, a data signal processor confirms a separate sensing schedule(450). In case there is the sensing schedule, the data transceiver receives sensing data(460).
Abstract:
PURPOSE: A method and a device for controlling transmission power of a cognitive radio device are provided to guarantee reliable communication of the cognitive radio device, thereby minimizing interference for a licensed user. CONSTITUTION: A CR(Cognitive Radio) device obtains CR environment information for a licensed user or an unlicensed user which occupies an adjacent cell or an adjacent channel of the CR device(802). The CR device determines a transmission power value by the CR environment information(804). The CR device generates transmission power control information including the transmission power value(806). The CR device controls transmission power by the transmission power control information(808).
Abstract:
PURPOSE: A method for reserving resources in a centralized network is provided to effectively reserve resources between a master device and a slave device. CONSTITUTION: A master device receives a resource reservation request from a slave device(S255). The master device receives a CRP(Channel Reservation Protocol) reservation request command frame from the slave device in an RSW(Reservation based Signaling Window) slot. The master device transmits a resource reservation response to the slave device(S260). The master device includes information about a resource reservation in a beacon(S265).
Abstract:
PURPOSE: A channel sensing scheme using a natural quiet period in a cognitive radio system is provided to reduce transmission period by reducing the frequency of QP allocation through the energy detection with an NQP. CONSTITUTION: An NQP information collecting unit(401) searches, from a network having a data transmission and reception period and an idle period, the period in which data transmission is stopped. A channel searching unit(402) searches the searched period, and a channel searching information processor(403) determines the length of idle period based on the searching result. In a reservation-based mesh network, the period in which data transmission is stopped corresponds to an IFS(Inter Frame Space).
Abstract:
A method and an apparatus for detecting a signal with cyclo-stationary characteristics are provided to efficiently perform a spectrum sensing by reducing a complexity of calculation in detecting a signal with cyclo-stationary characteristics. An apparatus for detecting a signal calculates cyclo-stationary characteristics values on a cyclic frequency domain of input signals(S110), normalizes the calculated cyclo-stationary characteristics values(S120), multiplies the calculated cyclo-stationary characteristics values each other(S130), compares the result values of multiplication with a critical value(S140), determines that the signal exists in the input signals in case a result value is larger than the critical value(S150), and detects the signal from the input signals(S160).
Abstract:
본 발명은 직교 주파수 분할 다중 접속(Orthogonal Frequency Division Multiplexing Access : OFDMA) 기반 인지 무선 시스템에서의 동적 자원 할당 방법 및 이를 위한 하향 링크 프레임 구조에 관한 것으로, 이 방법은 기지국이, 현재 사용되지 않는 유휴주파수대역의 주파수 선택성 정도에 따라, 적어도 하나의 빈-상기 빈은 주파수 상에서 연속된 제1 복수 개의 부반송파들로 이루어짐-으로 이루어진 부채널을 할당하는 AMC부채널 할당기법 및 주파수 상에서 분산형 제2 복수 개의 부반송파들로 이루어진 부채널을 할당하는 다이버시티부채널 할당기법 중 하나를 선택하는 선택단계; 및 상기 기지국이, 상기 선택된 부채널 할당기법에 따라 단말에게 적어도 하나의 부채널을 할당하는 할당단계를 포함한다. 본 발명에 따르면, 인지 무선 시스템에서 하향 링크의 효율을 높일 수 있다. OFDMA/FDD, 프레임 구조, 부채널