Abstract: A method for relaying a route request RREQ message by an intermediate node which is connected with at least one node using a tree topology in a mobile communication system including a destination node and a source node which sends the RREQ message to the destination node via at least one intermediate node, to thus establish an optimal route for communications. The RREQ message is received along the route other than the tree route, and the first information is updated using its information. The intermediate node relays to a next intermediate node the RREQ message containing the updated first information.

Abstract: This invention relates to DLL driving circuit of a semiconductor memory device and a method for driving the DLL. The DLL driving circuit includes a DLL reset unit for receiving a first bank selection address, a disable-DLL signal generator for receiving a second bank selection address and a mode register set signal, and a reset driver for receiving the disable-DLL signal outputted from the disable-DLL signal generator and driving the DLL reset unit. The present invention can improve chip performance by minimizing DLL failure in installation.

Abstract: Disclosed is a driving voltage controller of sense amplifiers for a memory device which prevents the sense amplifier from being over-driven when an external power voltage is used for an internal driving voltage of the sense amplifier. Reference voltage generator generates a reference voltage. Core voltage generator generates a core voltage to be used for driving voltage of sense amplifier. Comparator compares the core voltage generated by core voltage generator with the reference voltage generated by reference voltage generator. Clamp adjusts a level of the core voltage generated by the core voltage generator based on an output signal of comparator. In the case where an external power used for a driving voltage of the sense amplifier is excessively high, the comparator compares the external power voltage with the reference voltage. When the driving voltage of sense amplifier exceeds the reference voltage, the clamp drops the driving voltage of sense amplifier. Thus, the core voltage can be stably supplied.

Abstract: A column repair circuit of a semiconductor memory device including a plurality of memory cell array blocks each having the different number of wordlines comprises a predecoder, a block selector, a unit selector and a fuse means. The predecoder decodes a row address. The block selector generates block selecting signals to select the memory cell array blocks. The unit selector generates unit selecting signals to select a size of a row corresponding to the selected memory cell array. The fuse means generates a column repair control signal activated when a column repair is performed on the selected memory cell array block. The column repair circuit performs a column repair operation by a memory cell array block unit, thereby improving column repair efficiency and reducing the number of column repair fuses.

Abstract: A wireless communication method according to the present invention, in a Bluetooth device connected to multiple piconets and operating in a scatter mode, includes steps of (a) establishing credit values by link for the multiple piconets, and the total sum of the credit values by link as a temporary account value; (b) updating the credit values by link and the temporary account value every slot based on a predetermined manner; (c) performing communications through a link selected based on a comparison result of the credit values by link at each Presence Point(PP); and (d) unevenly redistributing predetermined credit values based on characteristics by link and returning to the step (b) in one of the two cases in which the communications are interrupted with a POLL_NULL sequence and the temporary account value becomes the same as the total number, n, of links.

Abstract: The present disclosure relates to a semiconductor memory device. A charge recycling circuit is driven to raise a potential of a restore node and a sensing bar node to a given potential before a sensing operation is performed. After the sensing operation is performed, electric charges discharged from the restore node and from the sensing bar node are stored using the charge recycling circuit and can then be used when a next sensing operation is performed. Therefore, current consumed when the sensing operation is performed can be reduced and the power consumption can be thus reduced.

Abstract: The present disclosure relates to a semiconductor memory device. A charge recycling circuit is driven to raise a potential of a restore node and a sensing bar node to a given potential before a sensing operation is performed. After the sensing operation is performed, electric charges discharged from the restore node and from the sensing bar node are stored using the charge recycling circuit and can then be used when a next sensing operation is performed. Therefore, current consumed when the sensing operation is performed can be reduced and the power consumption can be thus reduced.

Abstract: This invention relates to DLL driving circuit of a semiconductor memory device and a method for driving the DLL. The DLL driving circuit includes a DLL reset unit for receiving a first bank selection address, a disable-DLL signal generator for receiving a second bank selection address and a mode register set signal, and a reset driver for receiving the disable-DLL signal outputted from the disable-DLL signal generator and driving the DLL reset unit. The present invention can improve chip performance by minimizing DLL failure in installation.

Abstract: A semiconductor memory device comprising a plurality of dummy wordlines independently formed with a plurality of normal wordlines, a plurality of dummy wordline drivers for driving the plurality of dummy wordlines, a plurality of control circuits for controlling the plurality of dummy wordline drivers, a plurality of comparing units for comparing a voltage level of the dummy wordline and the predetermined reference voltage level and a plurality of outputting units for outputting signals outputted from the plurality of comparing units.

Abstract: A wireless communication apparatus and a method using the same are capable of transmitting data while changing a packet type according to a packet error rate. The wireless communication apparatus has a transceiving portion for receiving and transmitting a data packet from and to an external device, a packet type selecting portion, a calculation portion for calculating a packet error rate and transmission time of a transmitted data packet, and a control portion for controlling the packet type selecting portion to select a proper packet type for a transmission of a next data packet based on the calculated packet error rate so that the data can be transmitted within a minimum time and with a maximum efficiency. The wireless communication apparatus maximizes data transmission efficiency since it can transmit the data packet while changing the packet type adaptively to the packet error rate.

Abstract: A wireless communication apparatus capable of adjusting a time interval between slot sections in accordance with the amount of traffic in a piconet. The wireless communication apparatus has a transceiver for sending and receiving data to and from an external device, a beacon channel generator for generating a train of beacon slots during a park mode, with a constant interval, a slot section calculator for calculating the time interval of the trains of beacon slots consecutively generated based on a coefficient of slot utilization and a wakeup ratio, and a controller for controlling the beacon channel generator for allowing the trains of beacon slots to be generated at the time interval calculated by the slot section calculator. The beacon channel generator sets up an access window for activating the data communication with the external device, after the trains of beacon slots are generated.

Abstract: The present disclosure relates to a semiconductor memory device. A charge recycling circuit is driven to raise a potential of a restore node and a sensing bar node to a given potential before a sensing operation is performed. After the sensing operation is performed, electric charges discharged from the restore node and from the sensing bar node are stored using the charge recycling circuit and can then be used when a next sensing operation is performed. Therefore, current consumed when the sensing operation is performed can be reduced and the power consumption can be thus reduced.

Abstract: A semiconductor memory device comprising a plurality of dummy wordlines independently formed with a plurality of normal wordlines, a plurality of dummy wordline drivers for driving the plurality of dummy wordlines, a plurality of control circuits for controlling the plurality of dummy wordline drivers, a plurality of comparing units for comparing a voltage level of the dummy wordline and the predetermined reference voltage level and a plurality of outputting units for outputting signals outputted from the plurality of comparing units.

Abstract: The present invention discloses an apparatus and method for avoiding mutual interference between wireless communication systems. A measurement unit measures the strength of a signal received through a channel to be used in a transmission slot for a switching time of a reception mode and a transmission mode. A judgment unit compares the strength of the received signal with the strength of a reference signal, and judges data transmission. A control unit outputs a signal for performing a transmission operation of the data according to the judgment of the judgment unit. The wireless communication system transmits the data according to the input signal from the control unit. The data transmission is decided by confirming the state of the transmission slot, thereby avoiding collision with a communication apparatus using a frequency identical to a frequency of the channel of the transmission slot.

Abstract: A wireless communication apparatus, a wireless communication system employing the same and a control method thereof. When the wireless communication apparatus is operated as a master device, the wireless communication apparatus includes a transceiving unit for receiving and transmitting data externally, and a controller for analyzing a destination of a packet received for a certain period of time, detecting an amount of slot usage according to the destination, selecting a temporary master device according to the amount of slot usage, and transferring role of a master to the selected temporary master device. Accordingly, wireless sources can be efficiently used, and at the same time, peer-to-peer communication can be carried out among devices acting as slaves.

Abstract: A wireless communication device, a wireless communication system using the same, and a communication method therefor are provided. When a wireless communication device operated as a slave intends to communicate with other slave communication devices, the communication-intending slave device transmits a packet where an address of a destination slave device is recorded in a header region as a destination address to the wireless communication device operated as a master. When the address recorded in the header region of the packet is an address of another slave device, not the communication-intending slave device, the master device transmits the packet to the wireless communication device of the destination address. Accordingly, the communication is performed using the address recorded in the header region of the transmitted packet as the destination address. As a result, peer-to-peer communication between the slave devices is performed, without increasing a data processing load in the Bluetooth communication.

Abstract: A wireless communication apparatus, a wireless communication method thereof, and a wireless communication system employing the same. A master device of the wireless communication system requests one slave device of a network to perform a function of a master device for a predetermined time, and sends Piconet information about other slave devices of the network, while the one slave device receives the Piconet information from the master device and communicates with the other slave devices of the network for a predetermined time as a temporary master device. Accordingly, the one slave device becomes a dynamic master device and communicates with the other slave devices by using a frequency hopping sequence and a clock of a previous master device as they are, there is no need to transmit the frequency hopping sequence and the clock of the new master device to the slave devices, and accordingly, much time can be saved.

Abstract: A wireless communication apparatus, a wireless communication system adopting the same and a communication method thereof are provided. In the wireless communication system, a slave device transmits a predetermined priority to the master device, and a master device receives the predetermined priority from the slave device, and determines and assigns the slave device with a priority considering the predetermined priority. According to the wireless communication apparatus, the wireless communication system adopting the same and the communication method thereof, a suitable transmission rate is assigned to the slave device, not uniformly, but according to the need of the slave device, so that assigning of an excessive or insufficient transmission rate can be prevented.

Abstract: A wireless communication device and a controlling method thereof. The wireless communication device performing wireless communication includes a transceiver for transmitting and receiving data externally, and a controller for processing the data received from the transceiver, the wireless communication device operating as a slave that is connected to a master, the controller receiving a polling data addressed to the device from a master through the transceiver, and temporarily stopping the operation of the transceiver during a sleep period which is determined according to the number of other slaves connected to the master. Since the wireless communication device operated as an active slave can stop its data transmission/reception during a communication standby period, i.e., until the beginning of the next polling slot, the power consumption can be considerably reduced without affecting the communication itself.

Abstract: A method and apparatus for guiding a vehicle in which a transmission signal of a position transmitting device installed at key points on a roadside is received by a position receiving device mounted in the vehicle. The apparatus having members for coding position information on the road where the position transmitting device is installed and traffic information including danger information with respect to the road, storing the same, modulating and continuously transmitting the coded information to the vehicle. Also, the apparatus capable of receiving the transmission signal of a corresponding position while the vehicle is moving on the road, and continuously classifying and searching the information and the intensity of the signal. Another part of the apparatus for detecting the current position of the vehicle either by directly using the searched result or by computing a travel distance of the vehicle.