Patent application number | Description | Published |
20100061258 | METHOD AND APPARATUS FOR DETERMINING REPORTING PERIOD OF CHANNEL QUALITY INFORMATION IN MULTI-CARRIER WIRELESS SYSTEM - Provided are a method and an apparatus for determining a reporting period of channel quality indicator. The method includes the steps of: a) estimating a channel gain through a channel received from a base station; b) calculating a weight by using a variable for determining a fairness value and the estimated channel gain, and estimating weight channel quality to the estimated channel gain by using the calculated weight; c) comparing the estimated weight channel quality and a threshold value; and d) feeding back estimated channel quality indicator by using wireless resources assigned for the channel quality indicator feedback only in case that the weight channel quality is higher than the threshold value. | 03-11-2010 |
20100308629 | ACTIVE HEADREST APPARATUS FOR VEHICLE SEAT - An active headrest apparatus for a vehicle seat. A contact area in which the upper body of a person who is seated in a car in the event of a rear-end collision of the car is moved backward due to an inertial force and contacts a back plate can be increased, and a distance at which a headrest is moved and rises can be increased so that the function of an active headrest can be more faithfully performed and neck injury of the person who is seated in the car can be prevented to the maximum. | 12-09-2010 |
20110133577 | HORIZONTAL LINEAR VIBRATION DEVICE - The present invention provides a horizontal vibration device which comprises an upper case in which a spring connector is formed in the inner surface thereof and a lower case which is coupled with the upper case to form an internal space, a movable unit including a mass which horizontally reciprocates inside the case and a spring which is coupled between the case and the mass in order to support horizontal movement of the mass, a coil which is coupled with the mass and horizontally reciprocates together with the mass, a magnet which is fastened on the inner surface of the case and operates with the coil, and a power-supply unit which supplies power to the coil. | 06-09-2011 |
20110204686 | ACTIVE HEADREST - An active headrest has a simple structure so that injuries of the neck and a portion near the neck of a passenger can be effectively prevented in the event of a rear-end collision and forward and rearward inclinations of the active headrest can be adjusted in an ordinary driving state to improve user's convenience and shake of the active headrest with respect to a vehicle seat in an ordinary state can be prevented to suppress noise and vibration and the quality of the vehicle seat and the car can be improved. | 08-25-2011 |
20110317647 | METHOD AND APPARATUS FOR TRANSMITTING AND RECEIVING DOWNLINK SIGNAL FOR WHICH GUARD BAND IS CONFIGURED IN CELLULAR RADIO COMMUNICATION SYSTEM SUPPORTING BAND SCALABILITY - Disclosed is a configuration of a guard band for a radio communication system formed of consecutive sub-bands. Particularly disclosed are designs of a middle guard band for preventing interference between adjacent sub-bands and regulating a difference in frequency between signals transmitted in each sub-band in a radio communication system such as a multi-carrier OFDM system and a multi-carrier CDMA system that forms a wideband through carrier aggregation. Related transmission/reception method and apparatus are further disclosed. | 12-29-2011 |
20120028668 | METHOD AND APPARATUS FOR SENDING AND RECEIVING CONTROL CHANNEL IN WIRELESS COMMUNICATION SYSTEM - In a wireless communication system a control channel is required in order to use limited resources effectively. However, the control channel resource is part of the system overhead, and thus reduces the data channel resource used for data transmission. In the long term evolution (LTE) system based on OFDM, one sub frame the consists of fourteen OFDM symbols wherein a maximum of three OFDM symbols are used for the control channel resource and remaining eleven OFDM symbols are used for the data channel resource. Therefore, the quantity of energy that can be transmitted for the control channel resource is extremely limited compared to the data channel resource. For this reason, the coverage of the control channel becomes less than that &; of the data channel, and even if a user can successfully receive the data channel, reception failure of a control channel sometimes˜results in failure of data recovery. In the present invention, in order to expand the coverage of the control channel to at least the coverage of the data channel, the time resource of the transmission resource wherein the control channel is transmitted is expanded and allocated for sending and receiving the control channel. By way of methods for extending the time resource are provided a method wherein a plurality of sub frames are used to transmit one control channel, and a method wherein a part of a data channel is used for the control channel. | 02-02-2012 |
20120076038 | INFORMATION FEEDBACK METHOD FOR COORDINATED MULTIPOINT COMMUNICATION - Coordinated multipoint communication is a technology for improving cell-edge performance for users in a cell-type mobile communication system. In order to enable a coordinated multipoint transmission/reception operation, a user equipment report of a local environment is required to select both coordinated communication modes and communication partners in evolved Node B (eNB) base stations. According to the present invention, a method is described for feeding back information from User Equipment (UE) to a serving base station to enable a coordinated multi-point transmission/reception operation. The information reported through the feedback is classified into two categories corresponding to received signal intensity information and received signal timing information. The UE may select one or both types of information from between the categories to provide feedback. In embodiments of the present invention, various overhead-reducing reporting formats are described. | 03-29-2012 |
20130142121 | METHOD AND APPARATUS FOR TRANSMITTING/RECEIVING A REFERENCE SIGNAL IN A WIRELESS COMMUNICATION SYSTEM - A method and apparatus for transmitting/receiving reference signals in Long Term Evolution (LTE) and LTE-Advanced (LTE-A) systems includes determining whether a dedicated reference signal is detected in a current subframe; estimating, if a dedicated reference signal is detected in the current subframe, a data channel using the dedicated reference signal to receive data; and estimating, if no dedicated reference signal is detected in the current subframe, a data channel using a common reference signal detected in the current subframe to receive data. The transmission scheme uses a DeModulation Reference Signal (DM-RS) for channel response estimation. To secure backward compatibility of the LTE-A system, a Common Reference Signal is transmitted in normal subframes. | 06-06-2013 |
20130182596 | METHOD AND APPARATUS FOR SENDING AND RECEIVING CHANNEL STATE INFORMATION IN MULTIPLE-INPUT MULTIPLE-OUTPUT NETWORK WIRELESS COMMUNICATION SYSTEMS - A method and an apparatus for sending and receiving channel state information in network Multiple-Input Multiple-Output (MIMO) wireless communication systems are provided. Hybrid feedback technology is provided to transfer complete Channel State Information (CSI) to a transmitter by efficiently combining limited amounts of long-term channel information and short-term channel information are In a down link MIMO network system. | 07-18-2013 |
20140376523 | METHOD AND APPARATUS FOR REPORTING CHANNEL STATUS INFORMATION IN A WIRELESS COMMUNICATION SYSTEM - A method and apparatus of a user equipment are provided for transmitting a channel status report in a communication system. The method includes receiving first information for at least one channel status report; generating a first channel status report corresponding to the first information for the at least one channel status report based on a reference signal in a first subframe; and transmitting the first channel status report based on the first information for the at least one channel status report in a second subframe. The first information for the at least one channel status report comprises information for a period and an offset, and a difference between the first subframe and the second subframe is a smallest value greater than or equal to a predetermined value. | 12-25-2014 |
20150063324 | METHOD AND APPARATUS FOR REPORTING CHANNEL STATUS INFORMATION IN A WIRELESS COMMUNICATION SYSTEM - A method and apparatus of a user equipment are provided for transmitting a channel status report in a communication system. The method includes receiving first information for at least one channel status report; generating a first channel status report corresponding to the first information for the at least one channel status report based on a reference signal in a first subframe; and transmitting the first channel status report based on the first information for the at least one channel status report in a second subframe. The first information for the at least one channel status report comprises information for a period and an offset, and a difference between the first subframe and the second subframe is a smallest value greater than or equal to a predetermined value. | 03-05-2015 |