| Patent application number | Description | Published |
|---|
| 20080240285 | SEQUENCE GENERATING METHOD FOR EFFICIENT DETECTION AND METHOD FOR TRANSMITTING AND RECEIVING SIGNALS USING THE SAME - A sequence generation method for allowing a reception end to effectively detect a sequence used for a specific channel of an OFDM communication system, and a signal transmission/reception method using the same are disclosed. During the sequence generation, an index is selected from among the index set having the conjugate symmetry property between indexes, and a specific part corresponding to the frequency ā0ā is omitted from a transmitted signal. In addition, a reception end can calculate a cross-correlation value between a received (Rx) signal and each sequence using only one cross-correlation calculation based on the conjugate symmetry property. | 10-02-2008 |
| 20090067540 | METHOD FOR CONSTRUCTING RACH PREAMBLE AND METHOD FOR TRANSMITTING RACH SIGNAL - A wireless communication system is disclosed. A method for constructing a RACH preamble according to a cell radius of a base station (BS) irrespective of a guard time (GT) and a method for allocating the RACH preamble are disclosed. A method for constructing a preamble of a random access channel (RACH) includes acquiring time-length information of a predetermined cyclic prefix (CP) for each cell radius of a base station (BS), acquiring sequence time-length information of a single sequence or a repeated sequence, and constructing the preamble using the predetermined CP time-length information and the sequence time-length information, irrespective of a time length of a guard time (GT). | 03-12-2009 |
| 20090074093 | APPARATUS FOR TRANSMITTING DATA USING CARRIERS AND METHOD THEREOF - An apparatus for transmitting data using a plurality of carriers and method thereof are disclosed, by which PAPR improving effect is enhanced. A method of generating an OFDM signal, which is transmitted by spreading data symbols using a DFT (Discrete Fourier Transform) matrix, according to the present invention includes the steps of generating an output symbol by data-processing the data symbols in time domain in a manner of giving a specific weight to the data symbols and summing up the weight-given data symbols and generating the OFDM signal by performing OFDM data processing on the output symbol. | 03-19-2009 |
| 20090170508 | METHOD OF SEARCHING CODE SEQUENCE IN MOBILE COMMUNICATION SYSTEM - The present invention relates to a method of searching a code sequence in a cell based mobile communication system, by which a receiving side is able to code sequence detection efficiently. In a code sequence transmitting method for an efficient code sequence search in a mobile communication system, the code sequence transmitting method includes a step of boosting at least one tone for a code sequence and a step of transmitting the code sequence having the boosted at least one tone to a receiving side. | 07-02-2009 |
| 20090213809 | METHOD OF PERFORMING HANDOVER FOR A DUAL TRANSFER MODE IN A WIRELESS MOBILE COMMUNICATION SYSTEM - A method of performing Dual Transfer Mode (DTM) handover by a mobile station (MS) in a wireless mobile communication system is disclosed. More specifically, the MS receives information of neighbor cells, wherein the information is a list of neighbor cells whose signal strengths the MS should measure and transmits a message including results of the measured neighbor cells. Furthermore, the MS receives a message from a network, wherein the message is a DTM Handover Command message which instructs the MS to perform a DTM handover procedure with one of the neighbor cells. Lastly, the MS performs the DTM handover procedure. | 08-27-2009 |
| 20090219802 | APPARATUS AND METHOD FOR TRANSMITTING DATA USING A PLURALITY OF CARRIERS - The present invention relates to a data transceiving method in a communication system based on a plurality of carriers, and more particularly, to a method of designing a sequence in a communication system using orthogonal subcarriers. The present invention includes the steps of generating a time-domain sequence with a specific length in a time domain, generating a frequency-domain sequence by performing a DFT or FFT operation on the time-domain sequence according to a length of the generated sequence, including a DC subcarrier and a guard subcarrier in the frequency-domain sequence, and performing an IDFT or IFFT operation on the frequency-domain sequence including the DC subcarrier and the guard subcarrier. | 09-03-2009 |
| 20090220019 | APPARATUS AND METHOD FOR TRANSMITTING DATA USING A PLURALITY OF CARRIERS - A data transmitting and receiving method of transmitting supplementary data in an OFDM communication system is disclosed. The method of transmitting and receiving the OFDM signal includes: mapping an input bit stream into at least one transfer symbol; changing at least one of amplitudes and phases of the transfer symbols that are transmitted by a specific sub-carrier group having a plurality of sub-carriers using constellation modification information to indicate specific additional data; and transmitting the transfer symbols, to which the changing is carried out, to a receiving end by an orthogonal frequency division multiplexing data processing, the constellation modification information being identical to each other with respect to the transfer symbols that are transmitted by the specific sub-carrier group. | 09-03-2009 |
| 20090268602 | METHOD OF GENERATING CODE SEQUENCE AND METHOD OF TRANSMITTING SIGNAL USING THE SAME - A method of generating a code sequence and method of adding additional information using the same are disclosed, by which a code sequence usable for a channel for synchronization is generated and by which a synchronization channel is established using the generated sequence. The present invention, in which the additional information is added to a cell common sequence for time synchronization and frequency synchronization, includes the steps of generating the sequence repeated in time domain as many as a specific count, masking the sequence using a code corresponding to the additional information to be added, and transmitting a signal including the masked sequence to a receiving end. | 10-29-2009 |
| 20090296564 | METHOD AND APPARATUS FOR PRODUCING/RECOVERING OFDM/OFDMA SIGNALS - The present invention discloses a method of producing a multi-layered OFDM symbol using a plurality of small IFFT blocks. The produced OFDM symbol is able to reduce complexity in performing IFFT or FFT while maintaining orthogonality of a related art OFDM symbol. In particular, by avoiding the related art scheme using the N-sized IFFT, the layered IFFT is executed in a manner of grouping N data symbols into P groups each of which includes Q data symbols (N=PāQ). In order to produce an OFDM signal equal to that of the related art N-sized IFFT, it is preferable that phases are aligned for the data symbols on which Q-sized IFFT has been performed. | 12-03-2009 |
| 20090304097 | TRANSMITTING APPARATUS AND METHOD USING TONE RESERVATION IN OFDM SYSTEM - The present invention relates to an apparatus and a method for transmitting orthogonal frequency division multiplexing (OFDM) signals using a tone reservation scheme. Preferably, the present invention comprises an inserter to add a transmit format indicator (TFI) to an encoded packet, the TFI including a tone reservation rate for a peak to average power ratio (PAPR) control; a reordering module to change order of bits included in the encoded packet by discriminating information bits and parity bits of the encoded packet; a zero replacement module to replace a portion of the parity bits with at least one bit set for a PAPR control;ā a transmitter to transmit the replaced output using a plurality of orthogonal sub-carriers; and a controller to control the tone reservation rate based on status of received signals. | 12-10-2009 |
| 20090304108 | METHOD AND APPARATUS FOR IMPROVING PAPR IN OFDM OR ORDMA COMMUNICATION SYSTEM - A method and apparatus for diminishing a peak power to average power ratio (PAPR) in an OFDM/OFDMA communication system are disclosed, by which complexity in an OFDM/OFDMA communication system can be reduced. In an OFDM or OFDMA communication system, the present invention includes a circular shift module circularly shifting to output at least one or more data sequences according to circular shift information to be applied to each of the at least one or more data sequences converted to a time domain from a frequency domain, a combining module combining the at least one or more data sequences outputted from the circular shift module, and a PAPR calculating module calculating the PAPR of an entire data sequence combined by the combining module. | 12-10-2009 |
| 20090323855 | METHOD AND APPARATUS FOR GENERATING CODE SEQUENCE IN A COMMUNICATION SYSTEM - Disclosed are a method for generating a code sequence that can be used for acquisition of initial synchronization, cell detection, channel estimation, etc. in a mobile communication system, and a transmitter. A method for generating a code sequence in a transmitting side of a mobile communication system includes combining at least two code sequences with each other, and converting a code sequence generated by the combining step into a time domain signal. | 12-31-2009 |
| 20100220695 | METHOD AND APPARATUS FOR GENERATING AND TRANSMITTING CODE SEQUENCE IN A WIRELESS COMMUNICATION SYSTEM - A method of generating a code sequence in a wireless communication system is disclosed. More specifically, the method includes recognizing a desired length of the code sequence, generating a code sequence having a length different from the desired length, and modifying the length of the generated code sequence to equal the desired length. Here, the step of modifying includes discarding at least one element of the generated code sequence or inserting at least one null element to the generated code sequence. | 09-02-2010 |
| 20100272055 | METHOD OF MULTIPLEXING MULTIPLE ACCESS REGION - A method for multiplexing one or more multiple access regions is disclosed. The method for multiplexing one or more multiple access regions in a wireless access system comprises multiplexing the one or more multiple access regions so that a first base station and a second base station among a plurality of base stations which use one or more multiple access schemes together under a multi-cell environment use a single multiple access scheme in a predetermined resource region allocated to each of the first base station and the second base station; and transmitting multiplexing information obtained from the multiplexing the one or more multiple access regions to a mobile station included in a cell region of the plurality of base stations. As a user uses SC-FDMA scheme and OFDMA scheme together, it is possible to obtain a single carrier effect of the SC-FDMA system and flexibility of the OFDMA system on a time axis and a frequency axis. | 10-28-2010 |
| 20100278083 | METHOD FOR ESTABLISHING TIME DOMAIN STRUCTURE OF A FRAME IN A HETEROGENEOUS TDD SYSTEMS ENVIRONMENT - Disclosed in a method for establishing a time domain structure of a frame in a heterogeneous TDD systems environment. In other words, in a situation of coexisting heterogeneous systems comprising a first system corresponding to an existing TDD system and a second system corresponding to a new system, a method is provided for establishing a time domain structure of a second frame for the second TDD system mode to enable it to coexist with a first frame for the first TDD (Time Division Duplex) system mode, that comprises obtaining information for the first supported system type and a first ratio between the downlink region and the uplink region of the first frame structure, and then, according to the obtained information, establishing a second ratio between the downlink region and the uplink region of the second frame structure for the second system. Further, particular numerology is provided for said method. | 11-04-2010 |
| 20100284358 | Method for Transmitting Preamble for Legacy Support - A method for transmitting a preamble for legacy support is provided. In a communication system for supporting at least one of a first system corresponding to a legacy system and a second system which corresponds to an evolved system and supports two or more scalable bandwidths, a method for transmitting a preamble for the second system is provided. A preamble sequence is generated on the basis of a smallest bandwidth of the two or more scalable bandwidths, the generated preamble sequence is mapped to a resource zone to have a repetition factor which is relatively prime to a repetition factor of a repetition factor of a preamble for the first system, and the preamble sequence mapped to the resource zone is transmitted as the preamble for the second system. | 11-11-2010 |
| 20110007627 | METHOD AND APPARATUS FOR GENERATING RANGING PREAMBLE CODE IN WIRELESS COMMUNICATION SYSTEM - A method and apparatus of generating a ranging preamble code in a wireless communication system is provided. A mobile station (MS) generates one of a plurality of ranging preamble codes, wherein the plurality of ranging preamble codes are based on a padded Zadoff-Chu (ZC) sequence to which a cyclic shift is applied in a unit of N | 01-13-2011 |
| 20110007730 | METHOD OF GENERATING DATA AND TRANSMITTING SYNCHRONIZATION CHANNEL IN MOBILE COMMUNICATION SYSTEM - A method for a transmitting side to transmit a sync channel in a wireless communication system using a multicarrier is disclosed. The present invention includes the steps of generating one synchronization channel including a plurality of sub-synchronization channels and the generated multicarrier symbol to a receiving side via the synchronization channel. Accordingly, the present invention enables the transmitting side to efficiently use a radio resource, thereby raising data transmission efficiency of synchronization channel. | 01-13-2011 |
| 20110019622 | RANGING STRUCTURE, MULTIPLEXING METHOD AND SIGNALING METHOD FOR LEGACY SUPPORT MODE - A method of performing communication in a wireless communication system is disclosed. In performing ranging, which is performed by a terminal in a wireless communication system supporting a normal scheme and a legacy scheme, the present invention includes selecting a specific ranging structure from a first ranging structure supporting the normal scheme and a second ranging structure supporting the legacy scheme, and transmitting a ranging signal using the specific ranging structure, wherein the first ranging structure and the second ranging structure are set to differ in at least one of a time resource, a frequency resource and a code resource. | 01-27-2011 |
| 20110032855 | METHOD OF COMMUNICATING ACCORDING TO TIME DIVISION DUPLEX - The present invention provides a method of performing communication using a TDD (Time Division Duplex) mode, the method comprising receiving, from a second system, TDD frame configuration information of the second system, which comprises information on punctured symbol, the information on punctured symbol to be obtained based on TDD frame configuration information of a first system and operating based on the received TDD frame configuration information of the second system. | 02-10-2011 |
| 20110044215 | COMMUNICATION METHOD FOR RADIO COMMUNICATION SYSTEM - A communication method of a user equipment using a time division duplex (TDD) frame in a wireless communication system is provided. The communication method include configuring a TDD frame comprising at least one downlink subframe and at least one uplink subframe, and transmitting a signal by using the TDD frame, wherein an uplink of the TDD frame starts on the basis of a guard period (GP) or an uplink pilot time slot (UpPTS) of a heterogeneous TDD frame. | 02-24-2011 |
| 20110069672 | METHOD FOR UPLINK TRANSMISSION OF CONTROL INFORMATION IN MOBILE COMMUNICATION SYSTEM - A method for uplink transmitting control information in a mobile communication system is disclosed. A method for uplink transmitting control information in a mobile communication system includes receiving control channel configuration information for indicating a first period about a time interval in which a control channel is repeatedly allocated and a second period about a time interval in which the control channel is repeatedly allocated in accordance with the first period, generating a control channel at a predetermined position in a time-frequency resource region for uplink transmission in consideration of the first period and the second period, and transmitting control information through the generated control channel. | 03-24-2011 |
| 20110134747 | Method for Uplink Transmitting Control Information - A method for uplink transmitting control information from a user equipment in a wireless communication system comprises selecting a specific point among a plurality of points distributed into a symbol space, corresponding to control information, the symbol space including a modulation dimension and a sequence dimension; mapping a signal corresponding to the specific point with a control channel including single carrier-frequency division multiple access (SC-FDMA) symbols; and transmitting the control channel. Preferably, the specific point belongs to the sequence dimension. | 06-09-2011 |
