HANARO TELECOM, INC. Patent applications |
Patent application number | Title | Published |
20110305218 | METHOD FOR REQUESTING AND REPORTING CHANNEL QUALITY INFORMATION IN WIRELESS PORTABLE INTERNET SYSTEM - A method for requesting and reporting channel quality information (CQI) in a wireless portable Internet system is disclosed. Timing of a channel quality information request by a base station is determined, existence of an automatic repeat request acknowledgment (ARQ_ACK) message of downlink data is determined on requesting the channel quality information from the subscriber station, the automatic repeat request acknowledgment message and the radio resource for the channel quality report to the subscriber station is allocated, the automatic repeat request acknowledgment message and the channel quality report information is received, and a modulating and coding level of downlink data is determined by extracting the channel quality report information form the automatic repeat request acknowledgment message. | 12-15-2011 |
20110261960 | METHOD FOR ALLOCATING AUTHORIZATION KEY IDENTIFIER FOR WIRELESS PORTABLE INTERNET SYSTEM - A method and authentication apparatus for sharing information for identifying an Authorization Key (AK) with a Base Station (BS) in a subscriber station are provided. The method includes, in the subscriber station, sharing a root key with the BS by performing an authentication with the BS, sharing an AK derived from the root key with the BS, sharing an AK sequence number of the AK with the BS, and sharing an AK Identifier (AKID) of the AK with the BS. The AK sequence number is generated by a sequence number of the root key. The AKID is generated by a parameter including the AK, the AK sequence number, a Medium Access Control (MAC) address of the subscriber station, and a BS Identifier (BSID) of the BS. | 10-27-2011 |
20100046662 | DIGITAL CLIPPING METHOD FOR A TRANSMITTER OF AN ORTHOGONAL FREQUENCY DIVISION MULTIPLE ACCESS SYSTEM - The present invention relates to a digital clipping method for reducing a high peak-to-average power ratio (PAPR) of a transmission signal in a transmitter of an orthogonal frequency division multiplexing access (OFDMA) system. In the method, a) the transmission signal to be digitally clipped is divided into real and imaginary parts, b) magnitudes of the real and imaginary part signals are divided into a plurality clipping levels, and c) the transmission signal is respectively clipped by comparing the real and imaginary part signals with the plurality of clipping levels while allowing phase errors. In c), a plurality of comparators is used to respectively compare the real and imaginary parts of the complex number transmission signal with the plurality of clipping levels. | 02-25-2010 |
20090059840 | Wireless communication system and method for managing service flow identifier in the same - The present invention relates to a wireless communication system and a service flow identifier management method thereof. The wireless communication system includes a plurality of RASs for controlling a plurality of PSSs in a radio network, and a plurality of ACRs for providing wireless communication services to the PSSs through the plurality of RASs, and respectively managing a service flow identifier used for identifying a connection service for each PSS. When a status of each service flow identifier managed by the plurality of ACRs is different, the wireless communication system releases the corresponding service flow identifier so as to set the status of each of the service flow identifiers to be the same. According to the present invention, in the wireless communication system, the plurality of ACRs separately manage service flow identifiers, and mismatched service flow identifier information due to errors in the system or a node or message transmission/receiving errors can be set to be the same. In addition, when a partial system error occurs and thus the system is restored, a service flow identifier not having the same status due to the error can be efficiently released and set to be the same. | 03-05-2009 |
20090019284 | AUTHENTICATION METHOD AND KEY GENERATING METHOD IN WIRELESS PORTABLE INTERNET SYSTEM - An authentication method and authorization key generation method in a wireless portable Internet system is provided. In a wireless portable Internet system, the base station and the subscriber station share an authorization key when an authentication process is performed according to a predetermined authentication method negotiated therebetween. Particularly, the subscriber station and the base station perform an additional authentication process including an authorization key-related parameter and a security-related parameter and exchanges a security algorithm and SA (Security Association) information. In addition, an authorization key is derived from one or more basic key obtained through various authentication processes as an input key of an authorization key generation algorithm. Therefore, reliability of a security related parameter received from the receiving node can be enhanced and an authorization key having a hierarchical and secure structure can be provided. | 01-15-2009 |
20080310449 | Method and Apparatus For Upper Level Protocol Message - Upper level protocol message transmitting method and apparatus are provided based on a new management message to be used in a portable Internet system. When a base station receives the upper level protocol message to be broadcast, it includes the same in the management message and transmits the included message to all the mobile terminals of a cell, and thus, the total number of the transmissions is decreased, thereby increasing a wireless efficiency. | 12-18-2008 |
20080310318 | Apparatus and Method For Monitoring Base Station Signal in Communication System Having Multiple Antennas - In a signal monitoring apparatus of a base station of a communication system having multiple antennas, a transmitting/receiving unit transmits a plurality of transmit signals by using the multiple antennas or processes a plurality of receive signals received through the multiple antennas. A radio frequency calibration unit calibrates the transmit signals transmitted through the multiple antennas, and processes at least one target transmit signal among the plurality of transmit signals so as to monitor the at least one target transmit signal. A signal monitoring unit receives at least one first signal or at least one second signal, and transmits the at least one first signal or the at least one second signal to user equipment. The at least one first signal is a signal processed from at least one target receive signal among the plurality of receive signals, and the at least one second signal is a signal processed from the at least one target transmit signal by controlling the radio frequency calibration unit. | 12-18-2008 |
20080305804 | Method and Apparatus for Uplink Timing Synchronization with Ranging Signal in Mobile Communication System - When a base station of a time division duplex based mobile communication system receives an initial ranging request signal from a subscriber station, the base station generates initial ranging information including delay time information to the subscriber station, and receives uplink data delayed and transmitted using a delay time from the subscriber station. Also, when the subscriber station transmits an initial ranging request signal to the base station and receives initial ranging information including delay time information from the base station, the subscriber station establishes a transmission parameter value by using the transmission parameter value included in the initial ranging information and transmits uplink data by using the established delay time. | 12-11-2008 |
20080304440 | Terminal and Method for Accessing Wireless Connection - A method for establishing a wireless connection performed by a subscriber station (SS) to receive Internet services from a given terminal node through a base station (BS), the method including: a) when an initial connection with the BS is established, establishing a first MAC connection with the BS, and setting the first MAC connection as a dedicated TCP connection; b) when a given packet is generated, the SS determining whether the given packet is a control packet for a TCP connection with the SS; c) transmitting the given packet through the dedicated TCP connection when a control packet is transmitted, and establishing a TCP connection with the SS; d) after establishing the TCP connection, establishing a second MAC connection for data communication between the SS and the BS; and e) after establishing the TCP connection and the second MAC connection, receiving data from the SS through the second MAC connection. | 12-11-2008 |
20080287078 | Terminal and Method for Controlling Transmission Power - A terminal of a communication system includes a power amplifier, an open-loop power controller, a gain controller, a modulator, and a digital/analog converter. The power amplifier amplifies transmission power of a transmission signal. The open-loop power controller measures a received signal strength to control the transmission power, and increases a gain of the power amplifier according to the received signal strength. The gain controller sets a power concentration gain and applies the power concentration gain to the transmission signal when the gain of the power amplifier is maximized. The modulator modulates the transmission signal. The digital/analog converter converts an input signal to an analog signal. The gain controller applies the power concentration gain to the trans mission signal modulated by the modulator, and transmits the power concentration gain to the digital/analog converter. | 11-20-2008 |
20080267085 | Method for Generating /Changing Transport Connection Identifier in Portable Internet Network and Portable Subscriber Station Therefor - The present invention relates to a method for generating/changing a transport connection identifier (CID) in a portable Internet System, and a terminal using the same. Accordingly, the present invention provides a terminal including a packet detecting unit, a user input/output unit, a CID managing unit, and a data storing unit. The packet detecting unit determines whether a packet can be classified by a pre-established packet classification rule or a packet cannot be classified by the rules ( | 10-30-2008 |
20080240217 | Cinr Estimating Method and Device Using Preamble in Ofdm - A device and method for estimating a carrier to interference-plus-noise ratio (CINR) in an OFDM system are provided. The CINR estimating method includes (a) receiving a preamble symbol and transmit subcarrier transmitted from a base station; (b) calculating an interference power and noise power using the preamble symbol and transmit subcarrier; (c) calculating a receive power used for the base station to transmit a preamble and data symbol; (d) estimating a preamble CINR value using an interference power, a noise power, and a receive power; (e) calculating the noise power from a subcarrier not transmitting a preamble; and (f) calculating an average CINR of data subcarriers using the preamble CINR value and the noise power. With such a method, a precise carrier to interference-plus-noise ratio (CINR) can be estimated using a preamble when the preamble power is amplified in comparison with the data symbol power, the subcarriers are differently applied for the respective cells, and the traffic of the data area is partially loading. | 10-02-2008 |
20080232518 | Apparatus and Method for Automatic Gain Control of Mobile Station in Ofdm System - The present invention relates to an automatic gain control apparatus and method of a mobile station in an OFDM system. The present invention includes: identifying a preamble section and a data symbol section in a received frame signal; when a current symbol is the preamble section, measuring a power value of a preamble signal, comparing the measured power value of the preamble signal and a threshold value, and amplifying the received frame signal based on a predetermined gain value (gain=threshold−power value) according to a difference between the measured power value and the threshold value; when a data symbol section includes a pilot carrier, measuring an average power value of the pilot carrier in the data symbol when the data symbol section includes the pilot carrier, comparing the measured average power value of the pilot carrier and the threshold value, and amplifying the received frame signal based on a predetermined gain value (gain=threshold−pilot average power value) according to a difference; and when the data symbol section includes no pilot carrier, maintaining an existing gain, or performing an automatic gain control operation according to a gain estimated by using the pilot carrier during the data symbol section including the pilot carrier. Accordingly, the mobile station of the OFDM system that is robust to channel variation and various fading environments may be provided to efficiently perform the automatic gain control. | 09-25-2008 |
20080232330 | Method for Ranging with Bandwidth Request Code - The present invention relates to a ranging method using a bandwidth request code. For this purpose, the present invention provides a ranging method that includes transmitting a bandwidth request code for requesting a bandwidth for uplink traffic transmission from a radio access station, receiving a CDMA_Allocation_IE of a UL_MAP that includes uplink radio resource information from the radio access station, adjusting a transmission parameter according to an adjustment value included in the CDMA_Allocation_IE when periodic ranging performance is checked through the CDMA_Allocation_IE, checking whether the adjusted transmission parameter has an optimum value, and resetting a timer for periodic ranging, and a CDMA_Allocation_IE structure of a UL_MAP for the same. According to the present invention, delay in uplink data transmission of a portable subscriber station can be reduced by including a ranging parameter for a bandwidth request code in a UL_MAP, and a downlink bandwidth can be efficiently used by a radio access station by eliminating a process of RNG_RSP transmission. | 09-25-2008 |
20080214218 | Method for Maximal Ratio Combining of Spatially Filtered Signals and Apparatus Therefor - The present invention relates to a maximum ratio combining method of spatial-filtered received signals and an apparatus using the same. For this purpose the present invention provides a method for receiving signals by using a plurality of antennas that form a linear array antenna, multiplying a plurality of weight vectors by the received signals, summing the multiplication results for each weight vector, and combining the summing results by using maximum ratio combining. According to the present invention, signals are dividedly received by applying spatial filtering for a receiving direction of each signal and performance can be improved by combining the received signals by using maximum ratio combining. In addition, performance of an MRC-rake and a beam forming gain can be simultaneously acquired according to the present invention. | 09-04-2008 |
20080214128 | Diversity Transmission Method and Transmitter of a Base Station Using the Same in a Mobile Commmunication System - A diversity transmission method and a transmitter of a base station using the same is provided in a mobile communication system. For this purpose, the diversity transmission method for controlling power of transmit antennas when the transmitter transmits a signal to a mobile terminal using a plurality of antennas includes (a) receiving feedback information concerning the antenna having the best channel status from the mobile terminal, (b) increasing power allocation of a selected antenna according to the feedback information by a predetermined amount and decreasing power allocation of a non-selected antenna by a predetermined amount, and (c) transmitting the signal to the mobile terminal using the power allocation controlled in (b). | 09-04-2008 |