Abstract: Provided are a method and apparatus for generating a data frame. The method includes generating subframes from at least one media access control (MAC) service data unit (MSDU); generating a retransmission policy field for recording a policy related to a retransmission request, against an error occurring while the subframes are being transmitted, with regard to each of the subframes; and generating the data frame by using the subframes and the retransmission policy field which is generated with regard to each of the subframes.

Abstract: Provided is a creation supporting system and method using user-based metadata. According to the creation supporting system and method, metadata collected by a user for video content are stored so as to be provided to a creator. The creation supporting system includes a user terminal configured to receive evaluation data on video content from a user who watched the video content; a utilizer terminal configured to receive a search value from a utilizer desiring a search and request a video content search; and a service providing server configured to receive the evaluation data from the user terminal, construct metadata of video content, and compare the search value received from the utilizer server with the metadata for searching for a corresponding video content.

Abstract: A method and apparatus for setting up a wireless ad-hoc network, the method including: interchanging a terminal identifier and Wi-Fi protected setup (WPS) capability information with other terminals of the wireless ad-hoc network; selecting a role as a registrar or an enrollee based on the interchanged terminal identifier and the interchanged WPS capability information of the wireless ad-hoc network; and optionally registering in the registrar based on the selected role.

Abstract: Provided is a packet processing apparatus and method for audio/video (AV) data transmission, in which a simple protocol optimized for AV data transmission is used. Information distinguishing a data packet from a control packet may be included in a data link layer packet header, so that a data packet and a control packet may be distinguished from each other and thereby may be processed according to different procedures.

Abstract: Provided are a method and apparatus for generating a data frame. The method includes generating subframes from at least one media access control (MAC) service data unit (MSDU); generating a retransmission policy field for recording a policy related to a retransmission request, against an error occurring while the subframes are being transmitted, with regard to each of the subframes; and generating the data frame by using the subframes and the retransmission policy field which is generated with regard to each of the subframes.

Abstract: A capping apparatus for an ink-jet printhead protects a printhead of an ink-jet cartridge moved to a service station by a carriage during a standby mode. The apparatus includes a cap which seals the lower surface of the ink-jet cartridge surrounding the printhead, is spaced from the printhead by a predetermined gap and forms a sealed space; a cap holder which is connected to the lower portion of the cap and supports the cap; and a support portion which is connected to the lower portion of the cap holder and attaches to and detaches the cap and the cap holder from the lower surface of the ink-jet cartridge. A boss which penetrates the cap holder is formed in the cap, and an insertion element inserted into the boss to form a vent path to connect the sealed space to the outside.

Abstract: A method for transmitting a wireless data, including: (a) transmitting first data frames of the wireless data at a first transmission rate; (b) storing results of retransmissions of the first data frames in a first window array; (c) determining a second transmission rate; and transmitting the second data frames.

Abstract: A wireless data transmitting method through wireless network communications using an access point in an infrastructure mode including a contention-free period. The method includes the access point being set up to operate in the contention-free period, a first data frame including channel occupation information of a second data frame in order to occupy a channel when the access point transmits the first data frame to a designated wireless network apparatus, the wireless network apparatus transmitting an acknowledgement frame of the receipt of the first data frame to the access point, and the access point being released from the contention-free period.

Abstract: A networking apparatus and channel switching method being used by the same, wherein the networking apparatus includes a beacon frame checking unit which determines whether a beacon frame to be transmitted to a device has been transmitted, a channel searching unit which searches for another channel as a result of the determination, and a first channel switching unit which switches a current channel to another channel as a result of the search.

Abstract: Provided are a method of enabling a multi-input multi-output (MIMO) station and a single input single output (SISO) station to coexist in a wireless network and a wireless network device. The method includes receiving information on a station when the station accesses a wireless network, setting coexistence information by comparing a number of antennas of the station accessing the wireless network with a number of antennas of a plurality of stations constituting the wireless network, and transmitting a frame containing the coexistence information to the plurality of stations constituting the wireless network.

Abstract: A method and apparatus dynamically control data traffic, such as multimedia streams, needing a guaranteed Quality of Service (QoS) and normal data traffic, according to a variable communication environment. The method of dynamically controlling traffic in a wireless station includes reading header information of a packet received from an upper layer and determining a type of the packet, setting a priority according to the type of the packet, adjusting a size of a variable buffer by performing appropriate dynamic buffering according to the type of the packet, enqueuing the packet in a fixed buffer if the priority is high and enqueuing the packet in the variable buffer if the priority is low, and transmitting the packet enqueued in the fixed buffer to a destination station prior to the packet enqueued in the variable buffer.

Abstract: A method of providing priority-based discriminated services in a wireless LAN environment. More particularly, providing discriminated services while maintaining compatibility with existing 802.11 MAC through a priority index map configured to enable discriminated services. A method of providing priority-based discriminated services in a wireless LAN environment consistent with the present invention includes determining priority ranks for terminals in the wireless LAN environment; and determining backoff times based on the determined priority ranks, and attempting to occupy a channel by sending frames according to the determined backoff times if predetermined channel occupation latency elapses after the transmission of a last frame is completed.

Abstract: Provided is a wireless local area network (LAN) communication method in the Distributed Coordination Function mode. The method includes (a) setting a predetermined back-off according to the characteristic of data transmitted, and (b) transmitting data if a channel is available at the end of the back-off, and updating the back-off using residual back-off when a channel is used during the back-off. The data transmission throughput can be increased by reducing the back-off according to the characteristic of data to be transmitted. An increase in the data transmission throughput is particularly effective in transmitting real-time data.

Abstract: A method for data streaming in an ad-hoc wireless local area network (LAN). The method for data streaming includes receiving at least one streaming request frame that requests transmission of streaming data to at least one station, and transmitting frames containing the streaming data to at least one station with Short InterFrame Space (SIFS) interval. Streaming data is reliably transmitted in an ad-hoc wireless LAN without greatly changing existing wireless LAN standards.

Abstract: Transmitting multimedia data over a wireless local area network (WLAN), guaranteeing the full length of a multimedia point coordination function (mPCF) period in a WLAN, and dynamically allotting a length of the mPCF period, by receiving a request for multimedia resource from a predetermined device connected to the WLAN, during a distributed coordination function (DCF) period when a right to use a channel is distributed through contention and unilaterally transmitting the requested multimedia resource to the predetermined device during the mPCF period when the right to use a channel is distributed in a centralized manner.

Abstract: A capping apparatus for an ink-jet printhead protects a printhead of an ink-jet cartridge moved to a service station by a carriage during a standby mode. The apparatus includes a cap which seals the lower surface of the ink-jet cartridge surrounding the printhead, is spaced from the printhead by a predetermined gap and forms a sealed space; a cap holder which is connected to the lower portion of the cap and supports the cap; and a support portion which is connected to the lower portion of the cap holder and attaches to and detaches the cap and the cap holder from the lower surface of the ink-jet cartridge. A boss which penetrates the cap holder is formed in the cap, and an insertion element inserted into the boss to form a vent path to connect the sealed space to the outside.

Abstract: Disclosed is a device for feeding a recordable paper in an ink jet printer. The device according to the present invention is designed such that a recordable paper stacking plate is upward shifted by a reciprocal movement of a carriage to be positioned at a paper feeding position at an initial printing so that a recordable paper is in close contact with a feed roller. Thus, the recordable paper is picked up by a rotation of the feed roller and moved to a base frame. As a result, it is possible to save a time for feeding the recordable paper and printing data on the recordable paper. Further, there is advantage in that a time for picking up the recordable paper can be reduced by using a CR motor having a large torque.