Abstract:
Provided are an apparatus and a method to coordinate inter-cell interference using a base station and statistical information on a terminal period channel to improve a processing rate of a heterogeneous network on which a large cell and a small cell are mixed in a mobile communication environment. When limited channel information is provided on the heterogeneous network, the present invention provides the interference coordination apparatus and the method to reduce the performance degradation due to the interference. In addition, according to the present invention, the apparatus and method can control the interference of which a macrocell base station is applied to a picocell terminal using feedback information to periodically transmit between the terminal and the base station and a large fading gain and terminal, from a channel model.
Abstract:
Disclosed is a graphene switching device having a tunable barrier. The disclosed graphene switching device includes a first electrode and an insulating layer which are respectively arranged in a first region and a second region which are separated from each other on a conductive semiconductor substrate, a graphene layer which is extended from the insulating layer to the first electrode on the substrate and is separated from the first electrode, a second electrode which faces the insulating layer on the graphene layer, a gate electrode above the graphene layer, and a first well which has a region of the substrate which touches the lower part of the graphene layer which is doped with impurity. The first wall has an energy barrier which is between the graphene layer and the first electrode.
Abstract:
PURPOSE: A resource allocation method of an E-node B and an apparatus thereof in a multiple user MIMO-OFDMA system is provided to increase transmission efficiency by properly allocating a resource in a channel environment. CONSTITUTION: An E-node B allocates UEs(User Equipments) to each sub carrier in one or more types(400). The E-node B calculates transmission power based on information related to a space path(402). The E-node B stores sum of data rate if the calculated transmission power is the maximum transmission power(406). The E-node B selects total sum in a resource assignment algorithm(409).
Abstract:
PURPOSE: An apparatus and a method for communicating cooperatively using network coding in an uplink system comprised of a multiple relay device are provided to code and transmit transmission signals which need retransmission through a selected relay device among relay devices, thereby maximizing a diversity gain and facilitating adaptive communication due to a network change. CONSTITUTION: A signal receiving unit(113) receives a plurality of transmission signals from a plurality of transmitters(101). A request receiving unit(115) receives retransmission requests about some among the transmission signals. A transmitting unit(117) codes some transmission signals corresponding to the retransmission requests through a network and transmits the coded signals to a receiver.
Abstract:
본발명은비면허대역에서상향링크접속방법및 이러한방법을수행하는장치에관한것이다. 단말의상향링크접속방법은단말이제1 상향링크메시지의전송을위한제1 시간자원이전에제1 LBT(listen before talk)를수행하는단계, 단말이제1 LBT 이후, UL RS(uplink reservation signal)를전송하는단계, 단말이 UL RS의전송을중단하고, 제2 LBT를수행하는단계와단말이제2 LBT 이후제1 상향링크메시지를기지국으로전송하는단계를포함할수 있다.