Abstract: A packet routing apparatus and method are provided. The packet routing apparatus may participate in a sensor network. In certain aspects the packet routing apparatus may snatch a request to send (RTS) signal that is transmitted from a first node to a second node in the sensor network and may intervene on the relay path of the snatched data packet. In certain aspects, the packet routing apparatus may sniff a data packet that is transmitted from a first node to a second node and may intervene on the relay path of the sniffed data packet.

Abstract: Provided is an apparatus for adaptively operating an application program that may control whether to activate the application program based on whether a status of at least one of a wireless channel and a battery satisfy requirements of the application program.

Abstract: Provided is an apparatus and a method for transmitting power to electronic devices and of transmitting and receiving data. The method of transmitting power includes searching for a device to be charged located in an area, determining whether the found device needs charging, and transmitting power to the found device when the found device is determined to need charging. The apparatus may be mobile, and may travel towards or away from one or more devices based on whether the one or more devices need charging.

Abstract: Provided are an apparatus and method for acquiring a signal to noise ratio (SNR) gain and a diversity gain using multiple antennas for receiving data, and an apparatus for receiving a signal using multiple antennas. The apparatus may receive on-off keying modulated signals through K receiving antennas, detect envelopes with respect to each of the signals received through the K receiving antennas, combine signals generated by performing a linear processing and a nonlinear processing with respect to each of the K detected envelopes, and determine a message value of the on-off keying modulated signals.

Abstract: A packet routing apparatus and method are provided. The packet routing apparatus may participate in a sensor network. In certain aspects the packet routing apparatus may snatch a request to send (RTS) signal that is transmitted from a first node to a second node in the sensor network and may intervene on the relay path of the snatched data packet. In certain aspects, the packet routing apparatus may sniff a data packet that is transmitted from a first node to a second node and may intervene on the relay path of the sniffed data packet.

Abstract: A packet routing apparatus and method are provided. The packet routing apparatus may participate in a sensor network. In certain aspects the packet routing apparatus may snatch a request to send (RTS) signal that is transmitted from a first node to a second node in the sensor network and may intervene on the relay path of the snatched data packet. In certain aspects, the packet routing apparatus may sniff a data packet that is transmitted from a first node to a second node and may intervene on the relay path of the sniffed data packet.

Abstract: Disclosed is a method for detecting a hidden station in a specific station constituting a wireless communication network that includes receiving a frame after a lapse of an idle state interval longer than a predetermined waiting time; determining that there is a hidden station, if a size of the received frame is equal to a size of an Acknowledge (ACK) frame; and determining that there is no hidden station, if the size of the received frame is not equal to the size of the ACK frame.

Abstract: A wireless communication system including transmitters for determining a transmission rate for an associated receiver according to channel state information fed back from associated receivers, and transmitting packets at the determined transmission rate. In a communication method, a transmitter groups packets to be transmitted to the receivers according to transmission rates, and generates frames configured by packets with an identical transmission rate. The transmitter aggregates frames with different transmission rates into one transmission burst, and sends the transmission burst. The data communication method based on packet aggregation can efficiently manage resources by determining transmission rates for reception stations (STAs) on the basis of feedback channel state information in a transmission STA, aggregating packets to be transmitted to the reception STAs to form a packet group, and transmitting packet groups with different transmission rates using one multi-rate aggregation (MRA) burst.

Abstract: Disclosed is a receiver for configuring a Block Acknowledgement (BA) frame in a wireless communication system for acknowledgement of a data transmission from a transmitter. The receiver receives a Block Acknowledgement Request (BAR) frame in the data transmission from the transmitter and determines an overall size of a bitmap for the BA frame from the BAR frame to acknowledge the data transmission. The receiver configures the BA frame of the response to include the bitmap having the determined overall size, and transmits the configured BA frame to the transmitter. The bitmap of the BA frame includes bits representing reception results of packets of the data transmission received from the transmitter.

Abstract: Provided is an apparatus for adaptively operating an application program that may control whether to activate the application program based on whether a status of at least one of a wireless channel and a battery satisfy requirements of the application program.

Abstract: Provided are an apparatus and method for acquiring a signal to noise ratio (SNR) gain and a diversity gain using multiple antennas for receiving data, and an apparatus for receiving a signal using multiple antennas. The apparatus may receive on-off keying modulated signals through K receiving antennas, detect envelopes with respect to each of the signals received through the K receiving antennas, combine signals generated by performing a linear processing and a nonlinear processing with respect to each of the K detected envelopes, and determine a message value of the on-off keying modulated signals.

Abstract: A packet routing apparatus and method are provided. The packet routing apparatus may participate in a sensor network. In certain aspects the packet routing apparatus may snatch a request to send (RTS) signal that is transmitted from a first node to a second node in the sensor network and may intervene on the relay path of the snatched data packet. In certain aspects, the packet routing apparatus may sniff a data packet that is transmitted from a first node to a second node and may intervene on the relay path of the sniffed data packet.

Abstract: A method is provided for efficiently allocating a transmission period in a wireless network system. An access point (AP) transmits a PSMP frame indicating a downlink period provided to each station (STA) and a minimum amount of an uplink period allocated to each STA, and at least one sub PSMP frame indicating an uplink period additionally provided for an STA that transmitted a resource request message for remaining queued data in the uplink period indicated by the PSMP frame. If the uplink period indicated by the PSMP frame is insufficient to transmit the queued data, the STA transmits a data unit including a part of the queued data and a resource request message for the remaining queued data in the uplink period. After transmitting the resource request message, the STA receives the sub PSMP frame after the full period indicated by the sub PSMP frame, and transmits the remaining queued data to the AP in the uplink period indicted by the sub PSMP frame.

Abstract: Provided is an apparatus and a method for transmitting power to electronic devices and of transmitting and receiving data. The method of transmitting power includes searching for a device to be charged located in an area, determining whether the found device needs charging, and transmitting power to the found device when the found device is determined to need charging. The apparatus may be mobile, and may travel towards or away from one or more devices based on whether the one or more devices need charging.

Abstract: Disclosed is a method for detecting a hidden station in a specific station constituting a wireless communication network that includes receiving a frame after a lapse of an idle state interval longer than a predetermined waiting time; determining that there is a hidden station, if a size of the received frame is equal to a size of an Acknowledge (ACK) frame; and determining that there is no hidden station, if the size of the received frame is not equal to the size of the ACK frame.

Abstract: A method for managing a segment threshold includes determining whether a packet has been transmitted to a predetermined terminal, receiving from the predetermined terminal a response message indicating that the predetermined terminal has received the packet without any errors, if a packet has been transmitted to the predetermined terminal, receiving signal intensity data of a current packet transmitted from the predetermined terminal, and adjusting the segment threshold using the received signal intensity data of a current packet, if the response message has been received.

Abstract: A data transceiver and a data reception method for reducing power consumption in a mobile communication system are provided. The data transceiver includes a transmitter which transmits a plurality of data frames during a predetermined transmission period; and a receiver which receives data frames in the predetermined transmission period, if the transmission period is allowed and monitors with minimal operation power whether data transmission is in progress or completed in the transmission period, if the transmission period is not allowed.

Abstract: A cryptographic method using dual encryption keys and a wireless local area network (LAN) system therefor includes (a) generating a first group key in N wireless terminals forming an ad-hoc group, where N is equal to or greater than two, (b) generating a second group key in a main wireless terminal to perform a key distribution center function among the N wireless terminals, and transmitting the second group key to (N?1) sub wireless terminal, and (c) encoding data using the second group key, and transmitting the encoded data between the N wireless terminals. Data security in a wireless LAN system of an ad-hoc network is increased by creating a first group key having a low frequency of use using a group password, and using a random key generation algorithm to create, distribute, and modify a second group key in a wireless terminal functioning as a key distribution center.

Abstract: Disclosed is a method and an apparatus for self-calibrating direct current (DC) offset and imbalance between orthogonal signals, which may occur in a mobile transceiver. In the apparatus, a transmitter of a mobile terminal functions as a signal generator, and a receiver of the mobile terminal functions as a response characteristic detector. Further, a baseband processor applies test signals to the transmitter, receives the test signals returning from the receiver, and compensates the imbalance and DC offset for the transmitter side and the receiver side by using the test signals.

Abstract: Disclosed is a method for detecting a hidden station in a specific station constituting a wireless communication network that includes receiving a frame after a lapse of an idle state interval longer than a predetermined waiting time; determining that there is a hidden station, if a size of the received frame is equal to a size of an Acknowledge (ACK) frame; and determining that there is no hidden station, if the size of the received frame is not equal to the size of the ACK frame.