Patent application number | Description | Published |
20130163575 | CONTENTION BASED CHANNEL OCCUPYING METHOD IN WIRELESS NETWORK USING A PLURALITY OF CHANNELS - Disclosed is a contention based channel occupying method in a wireless network using a plurality of channels, including: acquiring, by terminals that are incapable of transmitting a data frame through primary contention, occupation channel information from a terminal that transmits the data frame through the primary contention; verifying, by the terminals, an occupiable channel based on the occupation channel information; and performing, by the terminals, secondary contention in the occupiable channel. | 06-27-2013 |
20130176960 | APPARATUS AND METHOD FOR COGNITIVE RADIO MESH NETWORK BASED ON GEOLOCATION DATABASE - A cognitive radio mesh node may include at least one directional antenna, at least one transceiver to transmit and receive data using the at least one directional antenna, and a processor to determine a channel for performing communication for a cognitive radio mesh network based on a geolocation database and to control the at least one transceiver based on the determined channel. | 07-11-2013 |
20130267266 | METHOD OF COMMUNICATING BETWEEN BASE STATION AND TERMINAL BASED ON INTERFERENCE ALIGNMENT IN MULTI-CELL MULTI-USER MULTIPLE-INPUT MULTIPLE-OUTPUT (MIMO) INTERFERENCE CHANNEL AND METHOD AND APPARATUS OF COMMUNICATION USING INTERFERENCE ALIGNMENT AND BLOCK SUCCESSIVE INTERFERENCE PRE-CANCELLATION IN MULTI-USER MULTIPLE-INPUT MULTIPLE-OUTPUT INTERFERENCE CHANNEL - A communication method of a base station and a terminal based on interference alignment in a multi-cell multi-user multiple-input multiple-output (MIMO) interference channel and a method and apparatus of communication using interference alignment and block successive interference pre-cancellation in a multi-user MIMO interference channel. The base station may determine a precoding matrix to maximize a signal to interference and noise ratio (SINR) and a signal to leakage and noise ratio (SLNR) in the interference channel, and a terminal communicating with the base station may determine a decoding matrix to align interference. The transmitter including a multicell interference channel may calculate a rotation matrix for interference alignment, identify effective symbol vectors using the rotation matrix, and generate a transmit signal of a target transmitter to pre-cancel interference corresponding to a transmit signal of a neighboring transmitter. | 10-10-2013 |
20130336175 | METHOD AND APPARATUS FOR DUPLEX IN COGNITIVE RADIO COMMUNICATION SYSTEM - Provided is a method for duplex in a cognitive radio communication system, including: collecting radio environment information including information of usable radio resources; determining a duplex scheme for each radio resource based on the radio environment information; and allocating at least one of the radio resources to information to be transmitted and received, depending on characteristics of the information. | 12-19-2013 |
20140162715 | CHANNEL INFORMATION PROVIDING METHOD, CHANNEL INFORMATION PROVIDING DATABASE SERVER, AND CHANNEL INFORMATION PROVIDING SYSTEM - The present invention provides a channel information providing method, a channel information providing database server, and a channel information providing system which receive channel quality information from a cognitive radio terminal which receives channel information based on position information and efficiently use channels using the received information. A channel information providing method which uses a database server to provide channel information to a cognitive radio terminal based on position information includes providing channel information to at least one cognitive radio terminal; receiving collected information regarding a quality of the channel from the at least one cognitive radio terminal; and determining to update the channel information provided in the providing using the information received in the receiving. | 06-12-2014 |
20140185458 | METHOD FOR MANAGING ERROR IN MULTICAST OR BROADCAST TRANSMISSION AND APPARATUS THEREOF - Disclosed are a method of managing an error in wireless transmission, and an apparatus thereof, and more particularly, a method of managing an error in multicast or broadcast transmission, and an apparatus thereof. The method of managing an error in multicast or broadcast transmission disclosed in the present invention includes: receiving data multicasted or broadcasted to a plurality of receivers; determining whether the data is normally received; selecting a random resource among wireless resources through which an acknowledgement indicating whether the data is normally received is to be transmitted; and transmitting the acknowledgement indicating whether the data is normally received through the selected random resource. | 07-03-2014 |
20140341178 | COMMUNICATION METHOD AND RESOURCE ASSIGNING METHOD BETWEEN A PLURALITY OF TERMINALS IN INFRASTRUCTURE NETWORK - A communication method between a plurality of terminals and a resource allocation method in an infrastructure network are disclosed. A terminal according to an embodiment communicates with at least one other terminal using a particular frequency band in a third time section distinguished from a first time section for reception of a downlink data and a second time section for transmission of an uplink data, thereby providing a technology of generating a small-scale network partly with respect to a particular region in a network with an extensive coverage of an infrastructure network. | 11-20-2014 |
20150092871 | APPARATUS AND METHOD OF ESTIMATING CHANNEL IN CONSIDERATION OF RESIDUAL SYNCHRONIZATION OFFSET - Disclosed herein are an apparatus and a method of estimating a channel in consideration of a residual synchronization offset. The apparatus of estimating a channel in consideration of a residual synchronization offset includes: a channel estimating unit estimating the channel using pilots scattered over a plurality of OFDM symbols and calculating a first channel estimated value as the estimation result, in the case in which an OFDM symbol estimating the channel and an OFDM symbol compensating for the channel are different from each other; and a phase reflecting unit calculating a phase generated by the residual synchronization offset in proportion to a difference between a channel estimation time and a channel compensation time, reflecting the calculated phase in the first channel estimated value, and calculating a second channel estimated value as the reflection result. | 04-02-2015 |