| Patent application number | Description | Published |
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| 20080226535 | Method and Apparatus for Manufacturing Carbon Nano Tube - The present invention relates to a method and apparatus for manufacturing a carbon nano tube, and more particularly, to a method and apparatus for manufacturing a carbon nano tube by which a carbon nano tube having a uniform property and high purity can be manufactured by uniformly raising a temperature of reaction gas, which includes a gaseous transition metal catalyst precursor compound and gaseous carbon compound contained in a hermetically closed reaction space, to the Boudouard reaction temperature. The method for manufacturing a carbon nano tube according to the present invention comprises the steps of preparing a reaction vessel including a substantially hermetic and compressible reaction space; supplying the reaction space with carbon nano tube reaction gas containing a gaseous carbon compound and a gaseous transition metal catalyst precursor compound; and compressing the reaction gas in the reaction space until a temperature of the carbon nano tube reaction gas supplied to the reaction space reaches a temperature equal to or greater than a minimum starting temperature of the Boudouard reaction and a temperature at which the transition metal catalyst precursor compound is thermally decomposed, thereby producing gas with carbon nano tube products suspended therein. | 09-18-2008 |
| 20100049858 | INITIAL ACCESS METHOD FOR BROADBAND WIRELESS ACCESS SYSTEM - Provided is an initial access method for a broadband wireless access system. The initial access method is used between a portable subscriber station (PSS) and a radio access station (RAS) in the broadband wireless access system and includes an authentication operation and a default transport connection setting operation. In the initial access method, default information, which is required to register the PSS and to set default transport connection, is stored in an authentication authorization accounting (AAA) server, the default information is then transmitted to the RAS connected to the PSS in the authentication operation by the AAA server, and when the PSS is registered and the default transport connection is set, a message composed of parameters, which are required to register the PSS containing the default information and to set the default transport connection, is then transmitted to the PSS by the RAS. Accordingly, a simplified initial access procedure is achieved. | 02-25-2010 |
| 20100054186 | INITIAL ACCESS CONTROL METHOD BETWEEN PERSONAL SUBSCRIBER STATION AND RADIO ACCESS STATION IN MOBILE COMMUNICATION SYSTEM - The present invention relates to an initial access based control method between a personal subscriber station and a radio access station in a mobile communication system. The present invention includes: a) selecting an initial access method corresponding to a first field value of a first parameter included in a first downlink channel descript message received from the radio access station; b) generating a first ranging request message corresponding to the initial access method; and c) transmitting the first ranging request message to the radio access station. The present invention guarantees mutual compatibility with the existing broadband wireless access system and realizes various initial access methods between the subscriber station and the radio access station. | 03-04-2010 |
| 20100091797 | APPARATUS FOR RECONSTRUCTING CONTROL MESSAGE, APPARATUS FOR RESTORING CONTROL MESSAGE, METHOD OF RECONSTRUCTING CONTROL MESSAGE, AND METHOD OF RESTORING CONTROL MESSAGE - The present invention relates to an apparatus for reconstructing a control message, an apparatus for restoring a control message, a method of reconstructing a control message, and a method of restoring a control message. To this end, an exemplary embodiment of the present invention provides an apparatus for reconstructing a control message, the apparatus including an index parameter generating section that classifies a plurality of first parameters in a control message according to a predetermined criterion to generate group information and generates one or more index parameters corresponding to the group information, and a control message reconstructing section that reconstructs the control message on the basis of the group information and the index parameters. According to the present invention, the size of a control message to be transmitted and received between a base station and a terminal can be reduced, thereby providing more additional services to the terminal through a limited radio resource. | 04-15-2010 |
| 20100271941 | METHOD OF CHANGING FREQUENCY ASSIGNMENT STATUS IN BROADBAND WIRELESS ACCESS SYSTEM - The present invention relates to a method of changing a frequency assignment (FA) status in an improved broadband wireless access system where terminals and base stations can communicate with each other by using a plurality of FAs. In the present invention, the base station changes the status of one of secondary FA into the status of the pFA in order to adjust a load of the primary FA, and communicates with the terminal through the pFA of which status is changed. For this purpose, the base station transmits a MAP information element (IE), which requests the change of the status of the pFA, to the terminal. The MAP IE includes an action code that requests the change of the status of the pFA, and a bit map representing an FA of which status is to be changed. When a response, which represents the completion of the change of the status of the pFA of the base station, is received from the terminal, the base station changes the status of the pFA and communicates with the pFA of the terminal through a new pFA. The status of a previous pFA between the base station and the terminal is changed into the status of the sFA, and the status of one previous sFA between the base station and the terminal is changed into the status of the pFA, so that communication is performed through new FAs. According to the present invention, since the base station can change the status of a specific terminal and FAs in use according to need, it is possible to adjust loads between the FAs. Further, the base station can change the statuses of the FAs in use while continuously maintaining the access of a specific terminal. | 10-28-2010 |
| 20100280890 | METHOD OF BROADCASTING AND RECEIVING NEIGHBORING BASE STATION ADVERTISEMENT MESSAGE IN BROADBAND WIRELESS ACCESS SYSTEM, AND HANDOVER METHOD USING THE SAME - The present invention relates to a method of broadcasting and receiving a neighboring base station advertisement message in a wideband wireless access system and a handover method using the same. In the present invention, a base station broadcasts a neighboring base station advertisement message including information that indicates that frequency overlay is supported in neighboring base stations to terminals. The terminal confirms whether frequency overlay is supported in the neighboring base stations included in the neighboring base station advertisement message, and can perform handover to a frequency overlay supporting base station as a destination base station. According to the present invention, when a non-frequency overlay communication system and a frequency overlay communication system are mixed with each other, it is possible to ensure that a frequency overlay supporting terminal performs handover from a base station of a frequency overlay communication system to a base station of another frequency overlay communication system. | 11-04-2010 |
| 20110149830 | APPARATUS AND METHOD FOR CONTROLLING MULTIMEDIA BROADCAST AND MULTICAST SERVICE BASED ON USER LOCATION - Provided is a multimedia broadcast and multicast service controlling apparatus and method based on a user location. The multimedia broadcast and multicast service controlling apparatus may receive MCCH information, may periodically update a service list of a mobile terminal based on the received MCCH information, the service list listing services that are providable, may register a service in a pending list when the service is not included in the updated service list and is requested to be provided, and may provide the service registered in the pending list when the mobile terminal reaches a location where the mobile terminal may provide the service registered in the pending list. | 06-23-2011 |
| 20110151875 | HANDOVER TERMINAL AND METHOD FOR RECEIVING BROADCAST DATA IN BROADBAND WIRELESS ACCESS SYSTEM, AND METHOD FOR PROVIDING INFORMATION OF SERVING BASE STATION - A mobile communication apparatus is provided. The mobile communication apparatus includes an information receiver to receive, from a serving base station, target base station information corresponding to at least one target base station located in a neighboring cell, and a controller to examine the target base station information and to perform a handover to the at least one target base station based on whether the at least one target base station supports a multi-band, and whether the at least one target base station provides a broadcast service. | 06-23-2011 |
| 20120072955 | STREAMING SERVER AND MOBILE TERMINAL FOR REDUCING CHANNEL-CHANGING DELAY, AND A METHOD THEREFOR - Provided is a method and apparatus for reducing zapping delay, which may transmit base layer data for each burst in a time-slicing scheme, and output the base layer data of a channel to be changed at the time of changing the channel, thereby reducing the zapping delay. | 03-22-2012 |
