Patent application number | Description | Published |
20120242280 | POWER SUPPLY FOR BOOSTING CHARGE - Provide is a power supply for boosting charge which is adaptive to a change in capacity by modularizing each part, can achieve modularization while facilitating insulation from a grid by installing a transformer at the grid side, can reduce the ripple of the output current by controlling a switching in a phase staggering scheme, and can reduce the ripple of the output current in an individual charging mode. The power supply for boosting charge includes: an input filter unit for filtering current or voltage introduced from a power grid; a rectifying unit for rectifying an AC voltage outputted from the input filter unit into a DC voltage; a DC link unit for smoothing an output voltage of the rectifying unit; and a battery charging unit which includes two or more battery charging modules connected in parallel to the DC link unit. | 09-27-2012 |
20140112332 | METHOD AND APPARATUS FOR SYNCHRONIZATION FOR DEVICE-TO-DEVICE COMMUNICATION - A method and an apparatus for synchronization for a device-to-device communication are disclosed. The method includes: instantly adjusting a synchronization phase value according to a time point when a synchronization signal is received, as soon as a device receives the synchronization signal from an adjacent device in an unconnected state; accumulatively storing at least one phase adjustment value according to a time point when at least one synchronization signal is received, whenever the device receives the at least one synchronization signal from at least one adjacent device in a connected state; and adjusting the synchronization phase value according to the stored at least one phase adjustment value when the device transitions from the connected state to the unconnected state. | 04-24-2014 |
20140120874 | METHOD AND DEVICE FOR MANAGING SECURITY KEY FOR COMMUNICATION AUTHENTICATION OF SUBSCRIBER STATION USED IN COOPERATIVE COMMUNICATION OF MULTIPLE BASE STATION IN RADIO COMMUNICATION SYSTEM - A subscriber station performs a method for managing a security key. The method includes generating, for each of the base stations, an input value for generation of the security key for data transmission and reception with the each base station; transmitting, to the each base station, the input value for a corresponding base station; and generating the security key of the corresponding base station by using the input value of the each base station. A base station provides cooperative communication to the subscriber station. | 05-01-2014 |
20140133593 | METHOD AND APPARATUS FOR SUPPORTING MULTIPLE-ACCESS SIGNAL IN MOBILE COMMUNICATION SYSTEM - In order to generate multiple-access signals, each transmitter transmits information by using all or a part of channel resources. The signal of each transmitter is mapped to an OFDM time-frequency resource space as a trellis modulation path. A mobile communication system maps trellis modulation paths of a plurality of transmitters to the same resource space. In order to effectively detect and distinguish signals of a plurality of transmitters transmitted through the same channel resource space, a receiver uses a message passing method between symbols and a path connection method. The receiver uses a state space expansion method, a backward pre-decoding method, and a successive interference cancellation method to more efficiently reconstruct a discovery signal. | 05-15-2014 |
20140269387 | SCHEDULING METHOD AND APPARATUS IN SYSTEM PERFORMING DEVICE-TO-DEVICE COMMUNICATION - A link scheduling method in a system for performing Device-to-Device (D2D) communication includes periodically collecting information indicating whether to perform a medium access from at least one neighboring link determining at least one link expected to perform a medium access in a corresponding traffic slot among links with a higher priority than the terminal based on the collected information, and determining whether to perform the medium access of the terminal by considering only the at least one link expected to perform the medium access. | 09-18-2014 |
20140270029 | APPARATUS AND METHOD FOR SUPPORTING DEVICE TO DEVICE COMMUNICATION - A method for operating a device in a wireless communication system supporting Device to Device (D2D) communication system includes receiving a reference signal from each of at least one transmitting device, estimating a frequency offset between the reference signals and a comparison reference signal corresponding to the reference signals, and adjusting a transmit frequency of a voltage controlled oscillator of the device using the estimated frequency offset estimation. An apparatus for compensating for a frequency offset of a device in a wireless communication system supporting Device to Device (D2D) communication system includes a frequency offset estimator configured to receive reference signals from each of at least one transmitting device, and estimating a frequency offset between the reference signals and a comparison reference signal corresponding to the reference signals, and a voltage controlled oscillator configured to adjust a transmit frequency using the estimated frequency offset. | 09-18-2014 |
20150264695 | METHOD AND APPARATUS FOR CONTROLLING INTERFERENCE IN DEVICE-TO-DEVICE COMMUNICATION - Disclosed is a method for controlling interference for D2D communication. The method includes: identifying whether a position of a first user device belongs to a first area that satisfies a predetermined criterion; and if the position of the first user device is identified to belong to the first area, determining some resources constituting dedicated resources of the first area, among available resources of a signal for discovering a counterpart user device of D2D communication by the first user device, as resources of the signal. | 09-17-2015 |
Patent application number | Description | Published |
20080268889 | METHOD AND APPARATUS FOR MANAGING ACTIVE SET IN A MOBILE COMMUNICATION SYSTEM - A method is provided for managing active sets of a terminal that receives a pilot channel from a base station in a mobile communication system. Reception strength of the pilot channel is measured. It is checked whether the number of active sets being managed by the terminal is greater than or equal to the predetermined maximum number of supportable active sets. It is determined whether to transmit a pilot to the base station according to the checking result. | 10-30-2008 |
20080287102 | METHOD AND SYSTEM FOR MANAGING MOBILITY OF MOBILE STATION IN A MOBILE COMMUNICATION SYSTEM USING MOBILE IP - A method and system for managing mobility of an MS in a mobile communication system using Mobile IP are provided. It is determined whether to generate an authentication key for mutual authentication between the MS and an HA after access authentication with an AG. The authentication key is generated, if it is determined to generate the authentication key after the access authentication. An information request message is transmitted to the AG. A reply message including information allocated by an AAA server is received from the AG. A binding update message for registering mobility binding of the MS is transmitted to the HA. | 11-20-2008 |
20090052356 | METHOD AND APPARATUS FOR TRANSMITTING ACK/NACK INFORMATION IN AN ORTHOGONAL FREQUENCY DIVISION MULTIPLE ACCESS SYSTEM BASED ON TIME DIVISION DUPLEXING - A method is provided for transmitting control information by a Base Station (BS) in a Time Division Duplexing (TDD)-based Orthogonal Frequency Division Multiple Access (OFDMA) system. The method includes determining a TDD ratio value; when a value obtained by dividing a number of consecutive Forward-Link (FL) time slots of a predetermined time interval by a number of consecutive Reverse-Link (RL) time slots is not a positive integer, grouping Mobile Stations (MSs) into multiple groups and generating group index information; and transmitting, to the MSs, control information including the TDD ratio value and the group index information. | 02-26-2009 |
20090059864 | METHOD AND SYSTEM FOR MANAGING MOBILITY IN A MOBILE COMMUNICATION SYSTEM USING PROXY MOBILE INTERNET PROTOCOL - A system is provided for managing mobility of an Access Terminal (AT) in a Proxy Mobile Internet Protocol (PMIP) communication system. As the AT performs a handoff, a target Signaling Radio Network Controller (SRNC) delivers session information of the AT, acquired from a source SRNC of a source network, to a target Access Network (AN). An Authentication, Authorization and Accounting server (AAA) performs an AT access authentication process. Then, a target Access Gateway (AGW) performs a proxy registration procedure, with the target AN, and receives, from the AT, a message indicating a need to establish an interface with the HA. A Home Agent (HA) performs mobility management for the AT, receives a message for requesting proxy registration for mobility management for the AT, sends an access request message to the AAA, receives an access accept message, and sends a response message for proxy registration to the target AGW. | 03-05-2009 |
20100111211 | Apparatus and method for transmitting/receiving data in a mobile communication system using multiple antennas - An apparatus and method for transmitting/receiving data in a mobile communication system using multiple antennas are provided. A receiver estimates a fading channel of received data, selects a weight set relative to a maximum data transmission rate from at least one weight set with elements of a plurality of orthogonal weight vectors, and transmits feedback information including the selected weight set and channel-by-channel state information to a transmitter. The transmitter demultiplexes data to be transmitted on a basis of the feedback information into at least one sub-data stream, multiplies each sub-data stream by an associated weight, and transmits the data. | 05-06-2010 |
20130124937 | METHOD AND APPARATUS FOR TRANSMITTING DATA IN DEVICE-TO-DEVICE SERVICE SYSTEM - A method for transmitting data in a second device that performs a Device-to-Device (D2D) service is provided. The method includes determining cooperative communication, if a value indicating a channel condition between a first device and a third device is less than or equal to a predetermined threshold, overhearing data transmitted from the first device to the third device and overhearing a response signal transmitted from the third device to the first device, to identify a transmission-failed data block of the first device, and if there are data transmission resources left at a predetermined scheduled data transmission time, transmitting the transmission-failed data block of the first device to the third device by piggybacking the transmission-failed data block on transmission data of the second device. | 05-16-2013 |
20130308625 | METHOD AND APPARATUS FOR PERFORMING SYNCHRONIZATION IN DEVICE-TO-DEVICE NETWORK - A method and an apparatus for performing synchronization by a first device in a Device-to-Device (D2D) network are provided. The method includes detecting a synchronization signal from at least one second device during one period, determining a phase adjustment value depending on a number of synchronization signals, which have been detected from the at least one second device during the one period, adjusting a phase value of a first device using the phase adjustment value, and transmitting a synchronization signal if the phase value of the first device reaches a predetermined specific value. | 11-21-2013 |
20130343298 | METHOD AND APPARATUS FOR TRANSMITTING PACKET IN SYSTEM PERFORMING D2D DIRECT COMMUNICATION - A method and an apparatus for transmitting a packet in a system performing a Device to Device (D2D) direct communication are provided. In the method, whether to transmit a small packet is determined. When small packet transmission is determined, at least one peripheral reception device is informed of whether the small packet is transmitted at a scheduling point. | 12-26-2013 |
20140126473 | APPARATUS AND METHOD FOR ROUTING DATA IN MOBILE COMMUNICATION SYSTEM - A method for routing data by a Corresponding Mobility Agent (CMA) in a mobile communication system is provided. The method includes managing mobility for a Mobile Station (MS) with a Mobile Access Gateway (MAG), and routing a data packet between a Corresponding Node (CN) and the MS based on a location of the MS, wherein the CMA is mapped to an application server which provides an application service. | 05-08-2014 |
20140307615 | Apparatus and Method for Transmitting/Receiving Multiuser Packet in a Mobile Communication System - An apparatus and method is provided for generating one packet with transmission data and transmitting the packet from an access network transceiver system (ANTS) to a plurality of access terminals (ATs) in a mobile communication system including the ATs and the ANTS which are capable of performing packet data communication with ATs located in coverage thereof. The method includes the steps of generating a medium access control (MAC) header including information on a receiving AT's address, a length and format for transmission data, generating a MAC payload, by consecutively connecting data units to be transmitted to the receiving AT, and generating a MAC trailer. The ANTS pads ‘0’ bits to the MAC header if a predetermined MAC size is greater than a sum of lengths of the MAC header, the MAC payload and the MAC trailer. | 10-16-2014 |
20140307873 | APPARATUS AND METHOD FOR GENERATING KEY HIERARCHY IN WIRELESS NETWORK - A method for generating a key hierarchy by a MS in a wireless network is provided. The method includes transmitting an authentication request message to a new BS, receiving an authentication response message as a response message to the authentication request message from the new BS, determining whether to perform a full authentication operation with a H3A server based on the authentication response message, performing the full authentication operation or a crypto-handshake operation with the H3A server based on the determining result, after performing the full authentication operation or the crypto-handshake operation, determining whether a first expected signature value received from the new BS is identical to a first expected signature value calculated by the MS, and if the first expected signature value received from the new BS is equal to a first expected signature value calculated by the MS, determining that an authentication for the new BS has succeeded. | 10-16-2014 |
20140321438 | METHOD AND APPARATUS FOR SYNCHRONIZATION FOR DEVICE-TO-DEVICE COMMUNICATION IN UNLICENSED FREQUENCY BANDS - A method and an apparatus for synchronization for Device-to-Device (D2D) communication in unlicensed frequency bands are provided. The method includes determining whether a signal is detected during a preset time period within a synchronization period, after transmitting a synchronization signal during the synchronization period for the D2D communication, when it is determined that the D2D communication is to be performed, and starting the time period for the D2D communication and performing the D2D communication during the time period for the D2D communication, when it is determined that the signal is not detected. | 10-30-2014 |
20140324974 | METHOD AND APPARATUS FOR PERFORMING DISTRIBUTED RESOURCE SCHEDULING IN DEVICE-TO-DEVICE COMMUNICATION SYSTEM - A distributed scheduling method in a Device-to-Device (D2D) communication system is provided. The method includes transmitting, to a peer device, first resource information including a link identifier and start position information of resources to be allocated, receiving, from the peer device, second resource information in which at least one of the resource start position information and a resource allocation amount is adjusted based on the first resource information, and determining the resource start position based on the first resource information and second resource information. | 10-30-2014 |
20140328267 | STRUCTURE OF MOBILE TERMINAL OPERATING IN A MOBILE COMMUNICATION SYSTEM SUPPORTING DEVICE TO DEVICE COMMUNICATION AND OPERATION METHOD THEREFOR - A mobile terminal in a mobile communication system supporting device to device (D2D) communication, and a method for operating the mobile terminal are provided. The terminal includes a first radio frequency (RF) chain configured to transmit a mobile communication signal and a second RF chain configured to receive a mobile communication signal, for mobile communication with a base station, a switching unit including a plurality of switches configured to establish transmission and reception paths in the first and second RF chains, and a controller configured to control switching of the switching unit to establish transmission and reception paths of a D2D communication signal for D2D communication by combining a part of the first RF chain with a part of the second RF chain. The combination of the parts of the first and second RF chains is different according to a D2D communication frequency band. | 11-06-2014 |
20140328317 | METHOD AND DEVICE FOR MANAGING MOBILITY IN IP BASED NETWORK - A method and a device for managing mobility of a mobile station in an Internet Protocol (IP) based network are provided. The method includes receiving a request for allocation of an IP address from an application, determining a type of IP address to be allocated to the application based on the request for the allocation of the IP address, and allocating the determined type of IP address to the application. | 11-06-2014 |
20140331303 | APPARATUS AND METHOD FOR AUTHENTICATING ACCESS OF A MOBILE STATION IN A WIRELESS COMMUNICATION SYSTEM - An apparatus and a method for access authentication of a mobile station in a wireless communication system are provided. The method includes receiving a session certificate for the access authentication from a core network, transmitting the session certificate to a new access network during a handover to the new access network, and receiving an authentication result based on the session certificate from the new access network. | 11-06-2014 |
20140376458 | METHOD AND APPARATUS FOR ALLOCATING RESOURCES FOR D2D COMMUNICATION - A method for allocating resources for Device-to-Device (D2D) communication in a transmitting terminal is provided. The method includes receiving broadcast resource allocation information for the D2D communication from a Base Station (BS), and measuring a channel quality of a downlink signal received from the BS and, if the measured channel quality is smaller than a predetermined threshold, conducting the D2D communication using the resource allocation information. | 12-25-2014 |