Abstract:
The present invention relates to a technique of transferring a frame, which is transferred to each user, by binding the frame in one aggregated frame in a physical layer level, when an access point (AP) transfers the frame to multiple users existing in one group in a wireless communication system using a wireless LAN standard which supports the users. An objective of the present invention is to increase a data throughput of entire network by reducing a signal transferred commonly upon transferring the frame separately to each user, by binding the frame, which is transferred to the users existing in one same group, in the aggregated frame.
Abstract:
The present invention relates to a technique for reducing power consumption of a mobile station through virtual hibernation of an access point, which manages a network, in a wireless local area network (WLAN) environment. According to an embodiment of the present invention, a device for implementing virtual hibernation during idle time, wherein effective data traffic is not generated, in a WLAN system transmits a virtual hibernation message which indicates that the device will not respond to a request of mobile stations for a predetermined time period; determines an implementation method of virtual hibernation and whether to maintain the association of associated mobile stations before implementing the virtual hibernation; and receives effective data from the mobile stations after the virtual hibernation for a predetermined time period is completed. [Reference numerals] (310) Transmission unit;(320) Control unit;(330) Reception unit
Abstract:
PURPOSE: A communications method in a multi-bandwidth supporting wireless local area network (LAN) system and an apparatus thereof are provided to transmit information of a receiving unit for determining a modulation mode, a code rate and a bandwidth and to determine a transmission rate in a transmitting unit using the information. CONSTITUTION: A receiving unit (1210) receives link margin information for each of multiple bandwidths from a receiving device of a multi-bandwidth supporting wireless LAN system. A control unit (1220) obtains a margin value of a signal-to-noise ratio based on the link margin information. The control unit determines a modulation and coding scheme (MCS) and a bandwidth based on the margin value of the signal-to-noise ratio. A transmitting unit (1230) transmits data to the receiving unit using determined MCS and bandwidth. [Reference numerals] (1210) Receiving unit; (1221) Condition information checking unit; (1223) Channel selecting unit; (1230) Transmitting unit
Abstract:
분산 매체 접근제어를 사용하는 무선통신 시스템에서 다중 경로를 사용한 데이터 송수신 장치 및 그 방법을 개시한다. 본 발명은 분산 매체 접근 제어 (Distributed MAC)을 사용하고 지향성 안테나(Directional antenna)를 사용하여 가시 거리(Line of Sight)를 통해 데이터를 전송하는 무선 통신 시스템에서 LOS를 사용하는 다이렉트 경로(direct path)와 릴레이 장치를 경유하는 릴레이 경로(relay path)를 포함하는 다중 경로 중에서 가장 좋은 채널의 경로를 선택하여 데이터를 전송하는 방법 및 그 장치에 관한 것이다. LOS(Line of Sight), 릴레이 경로, 분산 매체 접근 제어
Abstract:
본 발명의 일실시예에 따른 조정자 장치의 통신 방법은 예약 기반의 매체 접근 제어를 이용하는 무선 시스템의 조정자 장치(Coordinator)의 통신 방법에 있어서, 소스 장치가 데스티네이션 장치에게 전송하는 프레임이 릴레이 장치를 경유하여 중계될 수 있도록 하기 위하여 상기 소스 장치로부터 상기 릴레이 장치를 위한 예약 자원을 요청하는 프레임을 수신하는 단계; 및 상기 요청에 따라 상기 릴레이 장치를 위한 예약 자원을 할당하는 단계를 포함한다.
Abstract:
PURPOSE: A source apparatus using a directional antenna, destination apparatus, and communication method of relay apparatus are provided to syntagmatically use a reservation section irrespective of a transmission method. CONSTITUTION: A first link or a source apparatus is directly connected from the source apparatus to a destination apparatus. A state of a second link that is connected to the destination apparatus through a relay apparatus is detected from the first link or the source apparatus(103). One link is selected based on detection result of the first link and the second link(105). Data is transmitted using selected link(107).
Abstract:
PURPOSE: An arbiter device, a relay device, a source device, and a communication method of a destination device in a wireless network are provided to relay communication with the source device and the destination device through an optimized relay device which is selected by a beam forming result. CONSTITUTION: An arbiter unit(103) transmits a relay search response frame to a source unit(101). The source device performs beam forming in a link between the source device and a relay unit(105). The source device transmits the multi-relay channel measurement request frame to the relay device. The source device requests a resource for beam forming in the link between the source device and a destination unit(107). The arbiter device broadcasts information about a resource which is allocated to the link to the source device and the destination device.
Abstract:
PURPOSE: A synchronization control method for data transmission/reception and a station for data transmission/receipt synchronization is provided to supply estimation information to a terminal by estimating a transmission time and a frequency offset included in a terminal. CONSTITUTION: In a synchronization control method for data transmission/reception and a station for data transmission/receipt synchronization, a first terminal transmits first and second request frames including a transmission time of first and second frame to second and third terminal(S701). The first terminal receives the first and second frame from the second and third terminal(S703). The second and third terminal transmit response frame to the first terminal. The first terminal estimates a fist delay between the first and second terminals and a second delay between the first and third terminals(S705).
Abstract:
PURPOSE: A transmitter, a receiver and a method for extending coverage in WLAN are provided to receive the data between the target receiver and neighboring devices through cooperative MIMO. CONSTITUTION: A group forming unit(510) builds a transmission group with neighboring devices capable of local area network communication. A distribution unit(520) distributes the transmitted data about the target receiver to neighboring devices. A communication unit(530) transmits the distributed data through the frequency band for the local area network to neighboring devices. The communication unit transmits the distributed data through the cooperative Multiple Input Multiple Output mode with the receiving group of the target receiver.
Abstract:
본 발명은 가변 비트 해상도 혹은 클락 주파수를 가지는 아날로그 디지털 변환기를 이용한 적응형 변조방식 및 그 장치에 관한 것으로, 수신기로부터 수신한 변조방식에 따라 송신할 데이터를 변조하는 변조부; 상기 수신기로부터 수신한 비트 해상도 혹은 클락 주파수를 이용하여 변조한 데이터를 아날로그 신호로 변환하는 디지털/아날로그 변환부; 및, 상기 아날로그 신호를 무선채널을 통해 수신기로 송신하는 RF 처리부를 포함하는 송신기와 무선채널을 통해 데이터를 수신하는 RF 처리부; 상기 RF 처리부를 통해 수신한 상기 데이터의 신호 대 잡음비(SNR: Signal to Noise Ratio)를 계산하는 신호 대 잡음비 계산부; 및, 계산한 상기 신호 대 잡음비를 이용하여 기설정한 설정 테이블에서 상응하는 변조방식과 비트 해상도를 검색하여 송신기로 송신하는 변조 제어부를 포함하는 수신기를 포함한다. 아날로그 디지털 변환기, 비트 해상도, 적응형 변조, 클락 주파수