Abstract:
PURPOSE: A cooperative communication method in wireless LANs is provided to guarantee an additional transmission chance for a relay device, thereby providing suitable compensation for a relay operation. CONSTITUTION: Transmitting device 1 obtains a transmission chance. Transmission device 1 transmits the next RTS(Request To Send) frame to a receiving device. The receiving device determines whether to perform cooperative communication based on a possible transfer rate of transmitting device 1. The receiving device transmits a cCTS(cooperative Clear To Send) frame to transmitting device 1. Transmitting device 1 receives an riCTS(relay i Clesr To Send) frame from candidate relay devices. Transmitting device 1 selects an optimal relay device.
Abstract translation:目的:提供无线局域网中的协作通信方法,以确保中继设备的额外传输机会,从而为中继操作提供适当的补偿。 构成:发射装置1获得传输机会。 传输设备1将下一个RTS(请求发送)帧发送到接收设备。 接收装置基于发送装置1的可能的传送速率来判定是否进行协同通信。接收装置向发送装置1发送cCTS(协作清除发送)帧。发送装置1接收到riCTS(中继发送给Clesr To Send )帧。 发送装置1选择最佳中继装置。
Abstract:
본 발명은 오더링 스킴(Ordering Scheme)을 사용함으로써 공통 서브 채널 세트를 사용함으로 인해 발생하는 간섭을 감소시키고 직교 주파수 분할 멀티플렉싱 시스템의 용량을 증가시키는 오더링 스킴을 갖는 부분 주파수 재사용 방법에 관한 것으로서, 각 셀이 모든 셀에 대하여 공통으로 할당되는 공통 서브 채널 세트(Common Sub-channel Set)와 모든 셀에 대하여 상이하게 할당되는 전용 서브 채널 세트(Dedicated Sub-channel Set)를 가지고, 클러스터 사이즈에 따라 셀을 적어도 하나 이상의 타입으로 분류하는 단계와 셀의 타입에 따른 주파수 분할 스킴에 의해 전용 서브 채널 세트를 할당하는 단계를 포함한다. FFRO; 부분 주파수 재사용; FFR; OFDM
Abstract:
본 발명은 이더넷 수동 광 네트워크에서의 폴링 시스템 및 방법을 개시한다. 본 발명에 따른 이더넷 수동 광 네트워크에서의 폴링 시스템은, 이더넷 수동 광 네트워크의 광 채널을 공유하여 트래픽을 전송하기 위한 다수의 ONU(Optical Network Unit, 광 가입자망 장치) 및 다수의 ONU 중 접속 중인 다수의 ONU를 판별하여 접속 중인 다수의 ONU에 대한 라우팅 정보를 수집하고, 라우팅 정보를 토대로 접속 중인 다수의 ONU를 적어도 둘 이상의 ONU 그룹으로 분류한 후, 각 ONU 그룹별로 폴링(Polling) 사이클의 형성 및 대역폭의 할당을 실행하기 위한 OLT(Optical Line Terminal, 광 가입자망 장치)를 포함한다. 따라서, 본 발명은 트래픽 채널에서의 전송휴지구간을 최소화할 뿐만 아니라, 트래픽 채널 이용률을 최대화할 수 있다. EPON, 폴링
Abstract:
A link state update system and a control method thereof which efficiently calculates QoS guaranteed route are provided to sense a varied link state and update the link state update. A router unit(300) calculates a QoS guaranteed route satisfying the bandwidth according to a guarantee path setup request. The router sets up the QoS guaranteed route according to whether the route of being calculated exists in the database. A link management unit(500) changes the link status information of the QoS guaranteed route. The link manage changes link according to the QoS guaranteed route of being set up by using the changed link status information. In case the predetermined link information update threshold value is actually greater than one among the available bandwidth of the QoS guaranteed route and the available bandwidth, a database management system(700) renews database by using the changed link status information.
Abstract:
A method for operating a sleep mode for efficient energy management of a mobile terminal is provided to reduce repetition of a sleep interval and a listening interval from a time after the mobile terminal is converted into a sleep mode in a sleep mode algorithm of IEEE 802.16e to a time when data to be received is generated. A method for operating a sleep mode for efficient energy management of a mobile terminal comprises the following steps. A sleep interval value is checked when terminating a sleep mode of the mobile terminal. The amount of data packet stored in a buffer of a base station is checked. The base station sets the minimum sleep interval to be used in the next sleep mode of the mobile terminal based on sleep interval information when a previous sleep mode is terminated.
Abstract:
An upstream transmission band allocation method in a WDM(Wavelength Division Multiplexing)-based EPON(Ethernet Passive Optical Network) is provided to enable efficient band allocation by managing ONUs(Optical Network Units) by group, and to prevent unused channel sections from being generated. ONUs to be allocated to each of m wavelength channels are grouped(S1). So that the grouped ONUs use efficiently allocated wavelengths and time slots, dynamic band allocation algorithm is carried out to allocate each channel. The m wavelength channels are synchronized with one period. The one period is set based on a maximum permissible period. The m wavelength channels are synchronized with sub periods created by dividing the one period into m periods. The overall ONUs are grouped into m+1. The grouped ONUs start to transmit upstream frames at starting time of the synchronized period and sub periods.