Abstract: A method and apparatus for synchronizing applications of network terminals are provided. Time information, which is synchronized and managed with other terminals for controlling use of media in the network in a media access control (MAC) layer, is transmitted to an application layer so as to directly execute the application using a synchronization interface. Accordingly, it is possible to synchronize applications without exchanging packets for obtaining synchronization information of terminals using a TCP/IP protocol.

Abstract: Provided is a method of processing and transmitting transport stream packets and processing the transmitted transport stream packets. A time stamp is generated in a medium access control (MAC) layer based on time information managed by the MAC layer, and a data frame including the transport stream packets is retransmitted based on an algorithm different from that used for a general data frame when a transmission error occurs. Therefore, there is no need to transmit and receive additional synchronization packets in order to precisely transmit the transport stream packets between transmitting and receiving terminals, and it is possible to reduce performance deterioration caused by latency and jitter.

Abstract: A method is provided for determining a transmission rate of a control response frame for acknowledging data receipt in a wireless local area network. The method includes obtaining transmission parameters of a transmitting station from a data transmission frame received from the transmitting station, searching a receiving station for transmission parameters which correspond to the transmission parameters of the transmitting station, determining the transmission rate of the control response frame according to transmission parameters of the receiving station if the transmission parameters corresponding to the transmission parameters of the transmitting station are found in the receiving station, and determining a maximum rate among a set of basic transmission rates to be the transmission rate of the control response frame if the transmission parameters corresponding to the transmission parameters of the transmitting station are not found in the receiving station.

Abstract: Provided are an apparatus and method for allocating a data slot to transmit uncompressed audiovisual (AV) data. The method includes transmitting a first superframe that includes a data-slot-reservation period during a first beacon period and information thereon; receiving a frame that requests the data slot from at least one of wireless devices included in a network, in the data-slot-request period; transmitting a response frame to the data-slot-request frame to at least one of the wireless devices; and transmitting a second superframe that includes a data slot allocated to at least one of the wireless devices during a second beacon period.

Abstract: A method and apparatus for guaranteeing fairness regarding access to a medium among a plurality of stations in a wireless local area network (WLAN) where a plurality of high throughput (HT) stations and a plurality of 802.11 legacy stations coexist are provided. In the WLAN, information that allows a plurality of hearing legacy stations and a plurality of hearing HT stations which receive a data frame having an HT format transmitted by a transmitting HT station to fairly contend for use of a medium is transmitted as a frame having a format that can be interpreted by all the legacy HT stations. Therefore, the legacy stations can contend for a medium under the same conditions as the HT stations.

Abstract: A method and apparatus for reducing the power consumption of a wireless LAN device that operates in a wireless network are disclosed. The method for reducing the power consumption includes receiving a high throughput (HT) frame; judging whether the received HT frame is decodable; and if the received HT frame is not decodable, switching the wireless LAN device into a standby mode, and maintaining the device in the standby mode for a duration of the HT frame.

Abstract: A method is provided for determining a transmission rate of a control response frame for acknowledging data receipt in a wireless local area network. The method includes obtaining transmission parameters of a transmitting station from a data transmission frame received from the transmitting station, searching a receiving station for transmission parameters which correspond to the transmission parameters of the transmitting station, determining the transmission rate of the control response frame according to transmission parameters of the receiving station if the transmission parameters corresponding to the transmission parameters of the transmitting station are found in the receiving station, and determining a maximum rate among a set of basic transmission rates to be the transmission rate of the control response frame if the transmission parameters corresponding to the transmission parameters of the transmitting station are not found in the receiving station.

Abstract: A wireless local area network (WLAN) communication method and apparatus are provided. The WLAN communication method includes allowing a receiving station to receive a multi input multi output (MIMO) frame, allowing the receiving station to determine whether the MIMO frame is erroneous and whether the MIMO frame is destined for the receiving station, allowing the receiving station to generate a single input single output (SISO) acknowledgement (ACK) frame if the MIMO frame is not erroneous and is destined for the receiving station, and allowing the receiving station to transmit the SISO ACK frame to a sending station that has transmitted the MIMO frame.

Abstract: A wireless local area network (WLAN) communication method and apparatus are provided. The WLAN communication method includes allowing a receiving station to receive a multi input multi output (MIMO) frame, allowing the receiving station to determine whether the MIMO frame is erroneous and whether the MIMO frame is destined for the receiving station, allowing the receiving station to generate a single input single output (SISO) acknowledgement (ACK) frame if the MIMO frame is not erroneous and is destined for the receiving station, and allowing the receiving station to transmit the SISO ACK frame to a sending station that has transmitted the MIMO frame.

Abstract: A method and apparatus for determining an ACK frame appropriate for a wireless local area network (LAN) environment where high throughput stations and legacy stations with different data transmission capabilities coexist to acknowledge the receipt of a transmission frame. The method and apparatus enable each station to access a medium normally in the wireless LAN environment and complement a carrier sensing method. The method includes determining types of stations on a wireless local area network, determining the ACK frame for acknowledging the receipt of the transmission frame on the wireless local area network according to the result of determination, and notifying a corresponding station on the wireless local area network of the determined ACK frame.

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 data transmission method in a wireless LAN, an access point device and a station device are provided. The data transmission method for transmitting data from an access point on a wireless LAN includes allocating a sub-contention free period in which 802.11 based legacy stations and high throughput (HT) stations with multiple antennas obtain a channel use right through polling, and an HT contention period in which the HT stations can obtain a channel use right through contention. According to the method and devices, when there are no objects of polling in a contention free period, the period, in which the HT stations can obtain the channel use right though contention, is made to begin earlier such that without wasting the channel use period, the channel can be used flexibly.

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 wireless local area network (WLAN) communication method and apparatus are provided. The WLAN communication method includes allowing a receiving station to receive a multi input multi output (MIMO) frame, allowing the receiving station to determine whether the MIMO frame is erroneous and whether the MIMO frame is destined for the receiving station, allowing the receiving station to generate a single input single output (SISO) acknowledgement (ACK) frame if the MIMO frame is not erroneous and is destined for the receiving station, and allowing the receiving station to transmit the SISO ACK frame to a sending station that has transmitted the MIMO frame.

Abstract: A wireless communication method used in a wireless infrastructure network including multi input multi output (MIMO) stations. The wireless communication method includes generating a management frame that comprises information on a MIMO contention period during which MIMO stations contend with each other for a channel, and transmitting the management frame. The wireless communication method prevents collisions of frames transmitted from the MIMO stations and from the SISO stations.

Abstract: A wireless local area network (LAN) communication method that includes adaptively determining whether to apply a piggyback according to a communication environment, and transmitting a frame containing two or more kinds of information according to the result of the determination.

Abstract: Methods and apparatuses for setting, transmitting, and receiving virtual carrier sensing information in wireless network communications are provided. A receiving station in a wireless communications network receives a frame transmitted according to various modulation schemes and extracts information concerning virtual carrier sensing from a portion of the frame modulated using a basic modulation scheme, so that virtual carrier sensing is achieved using the extracted virtual carrier sensing information.

Abstract: Provided is a link adaptation method for a multi input multi output (MIMO) system having a multi-antenna structure and a communicating method of MIMO stations in a basic service set (BSS), which constitutes a wireless communication network. The communicating method includes receiving the number of MIMO antennas and transmission rates supported by the respective MIMO antennas from a predetermined MIMO station, storing one or more channel estimation indicators obtained while receiving various frames from the predetermined MIMO station for each MIMO antenna and for each transmission rate supported by the MIMO antenna, determining threshold levels of the channel estimation indicators for each MIMO antenna, comparing threshold levels of channel estimation indicators for each MIMO antenna with an average of channel estimation indicators for each MIMO antenna, and determining a transmission rate based on comparison results to then transmit data to the predetermined MIMO station at the determined transmission rate.

Abstract: Provided are a method and apparatus which can reduce the possibility of collision with other frames when transmitting a broadcast/multicast frame in a wireless local area network (LAN) following a Distributed Coordination Function (DCF) rule, thereby ensuring reliable transmission. The wireless communication method for sending or receiving a predetermined frame through contention between an access point and one or more stations according to DCF is characterized in that the access point uses the shortest of interframe space (IFS) intervals for access to a wireless medium. Therefore, when wireless LAN STAs operate in a DCF mode, the possibility of collision during broadcast or multicast frame transmission can be reduced while adopting conventional CSMA/CA mechanism, thereby improving reliability in successful frame transmission.