Abstract:
A method and an apparatus for reducing inter-channel interference using a redundancy channel by using a share or opening channel instead of currently used channel are provided to increase the frequency using rate by using the redundancy channel. An MS(Mobile Station) determines whether to generate ICI(Inter Channel Interference)(S220). If the ICI is generated, the MS transmits residual channel allocation request signal to a predetermined base station(S230). The MS receives the redundancy channel information which becomes by the base station(S250). According to the redundancy channel information, the MS converts into the allocated redundancy channel(S260). The MS communicates with the base station through the redundancy channel(S270).
Abstract:
A communication method in a CR(Cognitive Radio) environment using a relaying system and an apparatus for the same are provided to search for unused radio resources more easily in a CR environment by securing available radio resources more stably in order to search for an available frequency band, without the necessity of searching a wide frequency band. A CRBS(CR Base Station) executes synchronization with a relaying system for data transmission to share radio resources(S101). Then the CRBS receives a Tx frame of the relaying system from a PBS(Primary BS) and acquires control information(S102). Based on the acquired control information, the CRBS confirms whether a relay user who downloads data through an RS(Relay Station) exists among the users of the PBS(S103). If such a relay user exists(S104), the CRBS confirms the location of the relay user's DL(Downlink)/UL(Uplink) burst data through the relay user's DL/UL map information(S106). The CRBS acquires the relay user's Tx signal during the first hop while the relay user is transmitting DL data(S107). Based on the acquired Tx signal, or DL burst data, the CRBS performs orthogonal coding for data to be transmitted(S108). The CRBS transmits the coded data during the second hop while the relay user is transmitting DL data(S109).
Abstract:
An SM(Spatial Modulation) method in an MIMO(Multiple Input Multiple Output) system and a transceiving device using the method are provided to activate only one transmission antenna, thus the synchronization of transmission antennas is unnecessary, consequently transmission efficiency per unit hertz can be increased while inter-channel interference is removed from a receiving device. A transmission device comprises as follows. A separator(211) inputs a signal including a lot of bit information, and separates the signal into an antenna bit block and a signal modulation bit block. A signal modulation coder(213) codes the signal modulation bit block into a signal modulation. An antenna index coder(212) codes the antenna bit block into an antenna index. Plural antennas(220,230) consist of an active antenna for sending the modulated signal during unit time and an inactive antenna which does not transmit the signal during the unit time.
Abstract:
A system for transmitting or receiving information on resource allocation in a wireless communication system and a method thereof are provided to reduce overhead in accordance with transmission or receipt of information on the resource allocation by transmitting or receiving the information on the resource allocation via a general data area. A method for transmitting or receiving information on resource allocation in a wireless communication system comprises the following several steps. A base station transmits the information on the resource allocation to a terminal via a resource allocation information transmitting area, namely an MAP message(401). The base station checks whether a channel is in a good state(403). If so, the base station transmits information on the resource allocation, to be transmitted next time, with data via a data area(405) and checks whether an ACK message is received from the terminal(407). If not in the step 407, the base station repeats the step 401, but otherwise the base station checks whether a channel is in a good state(411). If so in the step 411, the base station checks whether there exists data to be transmitted to the terminal(413).
Abstract:
송신기의 송신 파워에 따라 적응적으로 센싱 기준 레벨을 제어하는 인지 무선 통신 장치 및 그 방법이 개시된다. 인지 무선 통신 장치는 세컨더리 네트워크에 속하는 세컨더리 송신기의 송신 파워에 따라 적응적으로 (adaptably) 센싱 기준 레벨을 제어하는 센싱 기준 레벨 제어부 및 상기 제어된 센싱 기준 레벨을 이용하여 미리 설정된 시간 구간 동안 수신된 신호가 존재하는 지 여부를 판단하는 고속(fast) 센싱부를 포함한다. 센싱, cognitive radio, 인지 무선, fast sensing, 송신 파워, 전송 파워, 센싱 기준 레벨, 프라이머리
Abstract:
라이센스 대역(licensed spectrum) 및 공유 대역(shared spectrum)의 효과적 사용을 위한 모바일 시스템 및 기지국 시스템을 개시한다. 모바일 시스템은 라이센스 대역 및 공유 대역 중 적어도 하나의 대역을 이용하여 데이터의 송수신을 초기화하는 초기화부, 상기 적어도 하나의 대역을 통해 상기 데이터의 송수신을 위한 대역을 센싱(sensing)하는 센싱부 및 상기 센싱된 대역을 통해 데이터를 송수신하는 송수신부를 포함한다.
Abstract:
본 발명은 CR 환경에서 무선 자원 공유의 한계 및 잦은 채널 이동으로 인한 문제점 등을 해결하기 위한 CR 환경의 송신 전력을 제어하는 방법 및 그 장치에 관한 것이다. 본 발명은, CR(Cognitive Radio) 환경과 동일한 채널을 사용하는 우선 사용자를 감지하는 단계와, 상기 우선 사용자가 감지된 경우, 상기 우선 사용자의 신호 품질 정보를 검출하는 단계와, 상기 검출된 우선 사용자의 신호 품질 정보를 이용하여, 상기 CR 환경의 CR 기지국 측에서 전송할 수 있는 최대 송신 전력값을 계산하는 단계 및 상기 계산된 최대 송신 전력값 이하의 범위로, 상기 CR 환경의 통신이 이루어 지도록 제어하는 단계를 포함하여 이루어 지는 CR 환경의 송신 전력을 제어하는 방법을 제공한다. 따라서, 본 발명에 의하면, CR 환경에서 우선 사용자가 출현한 경우에도, 해당 채널을 계속 사용할 수 있는 등 무선 자원 사용의 효율성을 대폭 제고시키는 효과가 있다. CR(Cognitive Radio), 잡음비, 우선 기지국
Abstract:
PURPOSE: An ultra low power wireless communication method and an apparatus thereof are provided to perform an ultra low power wireless communication while minimizing the influence of an interference by preferentially using a band in which an allowable output power characteristic is below a fixed value among industrial scientific medical (ISM) bands. CONSTITUTION: A sensing unit (210) senses status information of frequency channels which belong to an ISM band. A channel determining unit (220) distinguishes the ISM band based on an allowable output power. The channel determining unit prioritizes a band which is below a fixed allowable output power value. The channel determining unit determines a communication channel based on the status information of the frequency channels which are sensed in the sensing unit. A control unit (230) determines the communication channel which is determined in the channel determining unit as a communication channel with a sensor node. The control unit allocates the determined communication channel to the sensor node. [Reference numerals] (210) Sensing unit; (211) Judging unit; (213) Frequency Channel detecting unit; (220) Channel determining unit; (221) Ranking determining unit; (230) Control unit
Abstract:
PURPOSE: A main hub which communicates in a Wireless Body Area Network (WBAN) including at least one supplementary hub, and a supplementary hub, a sensor node, and a communication method thereof are provided to continuously operate a WBAN system in the absence of a main hub by using at least one supplementary hub. CONSTITUTION: A slot allocation unit (1220) allocates beacon slots to a main hub and at least one supplementary hub. A receiving unit (1230) receives a beacon signal based on the beacon slots from a supplementary hub which is determined as a target hub among at least one supplementary hub by at least one sensor node. An identification unit (1230) identifies whether the supplementary hub, which is determined as a target hub using the beacon signal, contains data which is transmitted to the main hub or not. An uplink section allocation unit (1250) allocates an uplink section in order to transmit the data to the determined target supplementary hub according to the identification result. [Reference numerals] (1210) Transmitting unit; (1220) Slot allocation unit; (1230) Receiving unit; (1240) Identification unit; (1250) Uplink section allocation unit; (1260) Connection unit
Abstract:
A signaling method between a cognitive radio (CR) base station and a CR terminal in a CR environment, and a channel division method used for the signaling method, includes: detecting a channel usage of an incumbent system, which communicates with a CR base station; sensing an outband channel to communicate with the CR base station; receiving an EOS, which is broadcasted from the CR base station via the outband channel according to a predetermined period; and transmitting a sensing report signal with respect to the channel to the CR base station.