Patent application number | Description | Published |
20090129353 | METHOD FOR RECOGNIZING AVAILABLE CHANNEL IN IEEE 802.15.4 PROTOCOL CSMA/CA MECHANISM - Disclosed is a method of recognizing an available channel in order to prevent channel occupation requirements from colliding with each other when one wireless channel is shared by plural terminals in a CSMA/CA mechanism using an IEEE 802.15.4 protocol slot, the method including: a first step of initializing a counter, CW, as 2, the CW being used for CCA which an attempt to perform is made before frame transmission; a second step of determining if a required channel is occupied; a third step of decreasing the CW by 1 when the channel is idle in the second step; a fourth step of re-determining if the channel is occupied; and a fifth step of, based on a determination result in the fourth step, determining if the CW is 1 when the channel is occupied. | 05-21-2009 |
20090190566 | METHOD AND APPARATUS OF CONTROLLING ACCESS MODE FOR COMMUNICATION SYSTEM USING SHARED OR UNLICENSED BAND - A technology that can adaptively control an access mode according to a shared band or an unlicensed band used by an adjacent communication system. An access mode controlling apparatus includes a band recognition unit to recognize a usage rate of an unlicensed band or a shared band that is used by an adjacent communication system of a target communication system; a mode determination unit to determine, as an access mode, any one of a contention access mode and a contention-free access mode, based on the usage rate of the unlicensed band or the shared band; and an information transmitter to transmit mode information associated with the determined access mode to member nodes or a base station of the target communication system. | 07-30-2009 |
20100067455 | METHOD FOR FRACTIONAL FRQUENCY REUSE WITH ORDERING SCHEME TO INCREASE CAPACITY OF OFDM SYSTEMS - Disclosed herein is a method for fractional frequency reuse with ordering scheme (FFRO) to increase capacity of orthogonal frequency division multiplexing (OFDM) systems while reducing interference due to the use of a common sub-channel set. Each cell includes a common sub-channel set assigned in common to all cells provided in a cluster and a dedicated sub-channel set assigned differently to all of the cells. The method includes classifying the cells into at least one type according to cluster sizes, and allocating the dedicated sub-channel set by frequency partitioning scheme based on the cell type. | 03-18-2010 |
20110032864 | METHODS OF PERFORMING COOPERATIVE COMMUNICATION IN WIRELESS LANs - Method of performing cooperative communication in wireless LAN includes determining, by receiver, whether cooperative communication is necessary based on transmission request signal provided from transmitter, when it is determined that the cooperative communication is necessary, transmitting, by the receiver, transmission response signal instructing the cooperative communication, overhearing, by a plurality of devices, the transmission response signal instructing the cooperative communication, transmitting, by at least one of the devices, response signal for supporting relaying to the transmitter, selecting, by the transmitter, a relay based on the response signal, transmitting, by the transmitter, data to the relay, and attaching, by the relay, data of the relay to the data transmitted by the transmitter and transmitting result data to the receiver. Thus, average transmission rate of wireless LAN can be improved with minimized overhead, and additional transmission opportunity can be provided to relaying device, thereby properly rewarding relaying device. | 02-10-2011 |
20130093571 | ANTI-COLLISION SYSTEM AND METHOD FOR REDUCING THE COLLISION OF DATA TRANSMITTED BY RFID TAGS - Provided are an anti-collision system and method which address the mobility of radio frequency identification (RFID) tags. An RFID reader may transmit an identification start command to identify a plurality of RFID tags in an identification area of the RFID reader. The RFID tags compare the number of collisions of each RFID tag receiving the identification start command with a collision threshold C | 04-18-2013 |
20140098776 | APPARATUS AND METHOD FOR SELF-SCHEDULING IN A WIRELESS COMMUNICATION SYSTEM - The present disclosure provides channel sensing in an efficient manner in a cognitive radio MAC protocol and improves channel utilization. Proposed is an Adaptive Channel Sensing (ACS) for variably sensing a channel in accordance with a Fixed Channel Sensing (FCS) and a channel state so as to perform the channel sensing in an efficient manner while reducing the power consumption of a terminal Further proposed is a self-scheduling mechanism which enables multiple terminals to simultaneously transceive data by means of a slot-based contention on the basis of the results of the FCS and ACS, which are proposed by the present disclosure. | 04-10-2014 |
20140146803 | NETWORK BROADCAST METHOD USING UNICAST AND RELAY NODE - A network broadcast method using a MAC unicast and an MPR node allows a source node to transmit a data packet to at least one MPR node which is located within one-hop distance from the source node and allows the at least one MPR node to transmit the data packet to each next-ranked MPR nodes. At least one normal node, which is not an MPR node while being located within one-hop distance from the source node, receives the data packet of the source node, which is transferred from the source node to an MPR node or transferred between MPR nodes through overhearing. Although the source node and MPR nodes are in a hidden-node relationship, collision is prevented, thereby minimizing data packet loss to improve the transmission reliability, and enabling the data packet of the source node to be reliably broadcasted on a network. | 05-29-2014 |
20140321305 | WIRELESS NETWORK, ACCESS POINT, AND TERMINAL - Wireless network, access point, and terminal are disclosed. A method for determining a size of an access window performed in an access point in a wireless network may comprise estimating a number of terminals attempting to access uplink (hereafter, uplink access attempt terminals) in a first access window including at least one uplink slot which is allocated to the terminal or is randomly selected by the terminal so as to transmit uplink data; and determining a size of a second access window next to the first access window based on the estimated number of the uplink access attempt terminals. | 10-30-2014 |
Patent application number | Description | Published |
20090257890 | OIL SEPARATING STRUCTURE OF VARIABLE DISPLACEMENT COMPRESSOR - Provided is an oil separating structure of a variable displacement compressor including: a cylinder block having a plurality of cylinder bores; a front housing disposed in the front of the cylinder block to form a swash plate chamber; a drive shaft rotatably supported at the cylinder block; a lug plate disposed in the swash plate chamber of the front housing and fixedly installed at the drive shaft; a rear housing disposed in the rear of the cylinder block and having a discharge chamber and a suction chamber communicating with the cylinder bores; a swash plate installed to be rotated by the lug plate to vary its inclination angle; pistons connected to the swash plate and reciprocating in the cylinder bores; a suction path for communicating the swash plate chamber and the discharge chamber; an additional exhaust path for communicating the swash plate chamber and the suction chamber; and a control valve installed in the middle of the suction path, characterized in that the drive shaft has a communication aperture formed therein for communicating the swash plate chamber and the suction chamber, and the lug plate has a first communication hole passing therethrough and a second communication hole formed therein for communicating the first communication hole and the communication aperture. Therefore, oil and refrigerant are smoothly separated from each other using only the communication hole formed in the lug plate without an additional oil separator, thereby simplifying an inner constitution of a compressor. | 10-15-2009 |
20100209261 | VARIABLE DISPLACEMENT SWASH PLATE TYPE COMPRESSOR - Provided is a variable displacement swash plate type compressor including a cylinder block having a plurality of cylinder bores, a drive shaft rotatably supported by the cylinder block, a lug plate fixedly installed at the drive shaft, a swash plate rotated by the lug plate to vary its inclination angle, and pistons reciprocally accommodated in the cylinder bores depending on rotation of the swash plate, the compressor including a projection projecting from the lug plate toward the swash plate and disposed only behind the rotational direction of the drive shaft, a slope formed on the rear part of the lug plate at one side of the projection, an arm projecting from the swash plate toward the lug plate, a first guide coupled to the arm in front of the rotational direction of the drive shaft to move along the slope in a contact manner, and a second guide coupled to the arm adjacent to the projection to move along the slope in a contact manner. | 08-19-2010 |
20100269686 | VARIABLE DISPLACEMENT COMPRESSOR HAVING REFRIGERANT FLOWING FUNCTION IN DRIVING SHAFT - Provided is a variable displacement compressor comprising a cylinder block having a plurality of cylinder bores, housing, a drive shaft rotatably supported by the cylinder block, a lug plate, a swash plate being rotated by the lug plate to vary a tilt angle thereof, a sleeve reciprocally moving along the drive shaft, an addition discharge passage for fluid communication between the swash plate chamber and the suction chamber, characterized in that the variable displacement compressor comprises: a communication hole being a part of the addition discharge passage and formed in the drive shaft in its longitudinal direction; and a lateral communication passage formed at the lateral side of the drive shaft to be connected to the communication hole such that the lateral communication passage is opened and closed by reciprocal movement of the sleeve. Therefore, even though the swash plate is at position of the maximum tilt angle, the temperature of the swash plate chamber is prevented from rising by making a smooth refrigerant flow from the swash plate chamber to the suction chamber, thereby maintaining higher lubrication ability. | 10-28-2010 |
20100282071 | VARIABLE DISPLACEMENT SWASH PLATE TYPE COMPRESSOR - Provides is a variable displacement swash plate type compressor comprising a drive shaft, a lug plate fixedly installed at one side of the drive shaft, a swash plate dispose at another side of the drive shaft and rotated by the lug plate to vary a tilt angle thereof, a sleeve reciprocally moving along the drive shaft to let the swash plate rotate, and a spring supported between the sleeve and the lug plate, characterized in that the variable displacement swash plate type compressor comprises a restriction ring installed around the drive shaft between the lug plate and the sleeve to contact with the swash plate at a maximum tilt angle of the swash plate, wherein an end of the restriction ring is contacted with the lug plate and another end of the restriction ring is supported by the spring. Thus, since the direct contact between the swash plate and the lug plate is prevented, when the swash plate reaches at the maximum tilt angle, it is possible to reduce the noise and the wear remarkably. | 11-11-2010 |
20130343920 | VARIABLE DISPLACEMENT SWASH PLATE TYPE COMPRESSOR - Provided is a variable displacement swash plate type compressor including: a lug plate fixed to a driving shaft; and a swash plate combined to the lug plate and whose tilt angle is varied according to rotatory motion, wherein the lug plate includes a protruding portion protruding towards the swash plate, and a rotatory power projection transmitting power for rotating the swash plate is formed at a leading end of the protruding portion through the swash plate. Accordingly, a varying operation between a maximum tilt angle and a minimum tilt angle of the swash plate and a rotatory power transmitting operation for rotating the swash plate are performed at different locations, thereby simultaneously improving the varying operation and the rotatory power transmitting operation of the swash plate. | 12-26-2013 |
Patent application number | Description | Published |
20100097542 | LIQUID CRYSTAL DISPLAY AND ASSEMBLY THEREOF - The present invention is broadly directed towards a receiving container for an LCD apparatus for securing a lamp and lamp wiring connected to a lamp. The receiving container has features for substantially preventing the lamp wiring from being disconnected from the lamp. For example, a first through-hole for receiving the lamp wiring, a first trench, securing members, and securing projections are utilized to substantially prevent lamp wiring from being disconnected from a lamp. Additionally, the LCD apparatus is easily handled, dissipates heat effectively, and has a light weight. | 04-22-2010 |
20100238373 | BACKLIGHT ASSEMBLY, LIQUID CRYSTAL DISPLAY APPARATUS HAVING THE SAME AND DEVICE FOR FORMING A PARTICLE INTERCEPTOR IN THE BACKLIGHT ASSEMBLY - To prevent particles from infiltrating into a display apparatus, a liquid crystal display panel supporting member includes a first particle interceptor and a second interceptor. The first particle interceptor is formed along the top face of the first supporting member frame portion facing a bottom plate of a liquid crystal display panel that is to be mounted on the liquid crystal display panel supporting member. The first particle interceptor has at least two cut portions. The second particle interceptor is disposed between the cut portions to prevent particles from infiltrating into the first particle interceptor. Thus, the liquid crystal display apparatus may prevent deterioration of its display quality. | 09-23-2010 |
20110122340 | LIQUID CRYSTAL DISPLAY AND ASSEMBLY THEREOF - The present invention is broadly directed towards a receiving container for an LCD apparatus for securing a lamp and lamp wiring connected to a lamp. The receiving container has features for substantially preventing the lamp wiring from being disconnected from the lamp. For example, a first through-hole for receiving the lamp wiring, a first trench, securing members, and securing projections are utilized to substantially prevent lamp wiring from being disconnected from a lamp. Additionally, the LCD apparatus is easily handled, dissipates heat effectively, and has a light weight. | 05-26-2011 |
Patent application number | Description | Published |
20090154489 | METHOD FOR DISTRIBUTING CONTENTION AMONG TERMINALS IN CONTENTION ACCESS PERIOD OF SUPERFRAME - Disclosed is a method for distributing contention among terminals in a Contention Access Period (CAP) of a superframe in regard to a Medium (or Media) Access Control (MAC) layer employing a beacon-enabled mode in IEEE 802.15.4 standard. The method includes: dividing the CAP or the superframe into a plurality of sub-periods, all having the same size; receiving an association request message from a relevant terminal; and allocating one of the plurality of sub-periods to the relevant terminal, and transferring information on the sub-periods to the relevant terminal through a beacon frame, by a Personal Area Network (PAN) coordinator. | 06-18-2009 |
20090175622 | METHOD FOR ALLOCATING UPSTREAM TRANSMISSION BANDWIDTH IN WDM-EPON - Disclosed is a method fox allocating upstream transmission bandwidth so as to prevent Inter-Scheduling Cycle Gaps (ISCGs) from occurring in an N number of Optical Network Units (ONUs) by using an m number of wavelength channels for upstream transmission in a Wavelength-Division Multiplexing (WDM)-Ethernet Passive Optical Network (EPON). The method includes: grouping the ONUs to be allocated each of the m number of wavelength channels; and performing a Dynamic Bandwidth Allocation (DBA) algorithm in order for the grouped ONUs to efficiently use allocated wavelengths and time slots, thereby allocating each wavelength channel. Accordingly, by using a scheme of managing ONUs by each group, it is possible to more efficiently allocate bandwidth than the online scheduling scheme. As compared with the offline scheduling scheme, ISCGs caused by bandwidth allocation do not occur. | 07-09-2009 |
20090190606 | SYSTEM AND METHOD FOR POLLING IN ETHERNET PASSIVE OPTICAL NETWORK - Disclosed is a system and a method for polling in an Ether net Passive Optical Network (EPON). The system includes: multiple Optical Network Units (ONUs) for sharing optical channels of the EPON with one another and transmitting traffic; and an Optical Line Terminal (OLT) for discriminating a plurality of ONUs gaining access to the EPON among the multiple ONUs and then collecting routing information on the plurality of ONUs gaining access to the EPON, and for classifying the plurality of ONUs gaining access to the EPON into two or more ONU groups according to the collected routing information and then carrying out forming a polling cycle and allocating bandwidth on each ONU group. Therefore, a transmission idle period in a traffic channel is not only minimized, but an availability ratio of traffic channels can also be maximized. | 07-30-2009 |