Abstract: A list managing method and apparatus that manage a list of content in a portable terminal having a touch screen according to multi-touch signals are disclosed. The method includes: detecting multi-touch signals input to a list on a touch screen; determining whether the multi-touch signals are input for a period of time equal to or greater than an activation time period; designating, if the multi-touch signals are input within the activation time period, the entire list with a selection area for altering a structure of a list; identifying a gesture generated by the multi-touch signals; expanding or contracting the structure of the entire list according to the gesture; and displaying the altered structure of the entire list on the touch screen.

Abstract: A system for providing position information by using a wireless personal area network (WPAN), and a method of acquiring the position information of a mobile device thereof where the system includes: a first node including referenced position information; and a plurality of second nodes calculating their respective position information based on the reference position information of the first node, wherein the mobile device calculates its position information by using the reference position information received from the first node and/or one or more of the respective position information of the second nodes. According to the system and method, at an indoor place where a global positioning system (GPS) signal is weak or absent, the GPS position information can be acquired through the position information providing system using a low-price wireless LAN communication network.

Abstract: A time division-based wireless LAN communication method by use of an AP in an infrastructure mode, including, on the AP's side, receiving a time slot allocation request frame from a station, allocating time slots during which the station can transmit data based on the time slot allocation request frame, and broadcasting reservation information on allocated time slots. A time division-based wireless LAN communication system includes an AP receiving a time slot allocation request frame transmitted by a station, allocating time slots on this basis, with which the station can transmit data, and broadcasting reservation information on allocated time slots, and one or more stations transmitting the time slot allocation request frame to the AP when there is data to be transmitted, receiving reservation information on time slots allocated by the AP based on the received time slot allocation request frame, and transmitting the data according to reservation of the beacon.

Abstract: A method of allocating frequency subbands in an ultrawideband (UWB) wireless communication system and an apparatus adopting the same are provided. The method of allocating frequency subbands to a device in a communication system, the method including: (a) determining whether usage of a first frequency band including upper frequency subbands is necessary; and (b) if it is determined that the usage of the first frequency band is necessary, not setting usage permission for the first frequency band to the device and not granting access to the first frequency band if a request for usage of the first frequency band is received from the device. When generation of a new piconet is necessary or generation of a new piconet is requested in a multi-piconet environment, since subbands of a high frequency group are allocated through negotiation, frequency resources are efficiently managed.

Abstract: A tag-based content classification method of classifying content based on a custom tag defined using user taste-based category information and a content reproduction apparatus to perform the method. The content classification method includes: analyzing content, and classifying the content based on whether the content comprises a first custom tag, the first custom tag and a second custom tag, the first custom tag, the second custom tag, and a tag, or the first custom tag and the tag.

Abstract: A method of allocating frequency subbands in an ultrawideband (UWB) wireless communication system and an apparatus adopting the same are provided. The method of allocating frequency subbands to a device in a communication system, the method including: (a) determining whether usage of a first frequency band including upper frequency subbands is necessary; and (b) if it is determined that the usage of the first frequency band is necessary, not setting usage permission for the first frequency band to the device and not granting access to the first frequency band if a request for usage of the first frequency band is received from the device. When generation of a new piconet is necessary or generation of a new piconet is requested in a multi-piconet environment, since subbands of a high frequency group are allocated through negotiation, frequency resources are efficiently managed.

Abstract: A system for providing position information by using a wireless personal area network (WPAN), and a method of acquiring the position information of a mobile device thereof where the system includes: a first node including referenced position information; and a plurality of second nodes calculating their respective position information based on the reference position information of the first node, wherein the mobile device calculates its position information by using the reference position information received from the first node and/or one or more of the respective position information of the second nodes. According to the system and method, at an indoor place where a global positioning system (GPS) signal is weak or absent, the GPS position information can be acquired through the position information providing system using a low-price wireless LAN communication network.

Abstract: A fast hand-over method of a mobile device roaming in a wireless LAN environment includes: receiving GPS information; based on the received location information of the mobile device, searching one or more APs; by scanning the searched APs, detecting an AP to reassociate with; and reassociating with the detected AP. According to the method, when roaming in a wireless LAN environment, a mobile device calculates a moving path by using GPS information and then, by scanning only APs belonging to channels allocated to areas related to the moving direction, the mobile device can reduce a hand-over period, and as a result, a QoS guaranteed service can be provided continuously. Also, by using GPS information, the mobile device can selectively switch to an optimum network service in an area to which different network services are applied.

Abstract: An image photographing apparatus using location information, a method of storing data therefor, and a navigation apparatus using the location information included in the image data, are provided. The image photographing apparatus includes a filming unit for photographing an object and providing the image data, a location information providing unit for providing location information of the place where the image data is taken, a control unit for adding location information to an area of the image data, and a storage unit for storing the image data according to the control of the control unit. According to the apparatus and method, a user is required to perform less searching by creating and using the filenames including the location information when the image data is retrieved, thereby saving time, and the image data can be arranged and stored as the user desires, so that the image data can be managed efficiently.

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: Provided are a method of controlling frame transmission in a wireless local area network (WLAN) and an apparatus using the same. A first retransmission control method includes: comparing the number of errors in a frame received from a server with a predetermined threshold; and adaptively not allowing retransmission of the frame on the basis of the comparison result. Therefore, optimal pictures can be provided without regard to a state of a WLAN environment by adaptively allowing retransmission frames in which errors are detected.

Abstract: A location tracking method in a coordinator-based wireless network is provided. The location tracking method in a coordinator-based wireless network includes transmitting a first frame including its own identifier and time information to the wireless network by a device associated with the wireless network in order to disclose its location information; and receiving a second frame including the location information of the device transmitted from the wireless network by the device, as a response to the first frame.

Abstract: A method of allocating frequency subbands in an ultrawideband (UWB) wireless communication system and an apparatus adopting the same are provided. The method of allocating frequency subbands to a device in a communication system, the method including: (a) determining whether usage of a first frequency band including upper frequency subbands is necessary; and (b) if it is determined that the usage of the first frequency band is necessary, not setting usage permission for the first frequency band to the device and not granting access to the first frequency band if a request for usage of the first frequency band is received from the device. When generation of a new piconet is necessary or generation of a new piconet is requested in a multi-piconet environment, since subbands of a high frequency group are allocated through negotiation, frequency resources are efficiently managed.

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: A method for transmitting multimedia data in a wireless network using an access point, comprising receiving information on a data quantity from each of stations, and assigning and sending a waiting time to each of the stations based on the received information on the data quantity. Consistent with another aspect of the present invention, there is provided a method for transmitting multimedia data in a wireless network using an access point, comprising providing, by each of stations, information on data quantity to the access point, receiving a waiting time assigned by the access point based on the received information on the data quantity, and transferring, by each station, the data through contention in accordance with the assigned waiting time.

Abstract: A time division-based wireless LAN communication method by use of an AP in an infrastructure mode, including, on the AP's side, receiving a time slot allocation request frame from a station, allocating time slots during which the station can transmit data based on the time slot allocation request frame, and broadcasting reservation information on allocated time slots. A time division-based wireless LAN communication system includes an AP receiving a time slot allocation request frame transmitted by a station, allocating time slots on this basis, with which the station can transmit data, and broadcasting reservation information on allocated time slots, and one or more stations transmitting the time slot allocation request frame to the AP when there is data to be transmitted, receiving reservation information on time slots allocated by the AP based on the received time slot allocation request frame, and transmitting the data according to reservation of the beacon.

Abstract: A wireless network communication method using an Access Point (AP). The method includes creating a polling list based on association identifications of stations stored in the AP. Thereafter, a polling signal is transmitted to one of the stations according to the polling list in an interval of a PCF mode. Data, which will be transmitted, is transmitted from the station in response to the polling signal transmitted from the AP. The data transmitted from the station is received by the AP, and is stored in a buffer of the AP. The number of pieces of data is compared with a threshold value set in the buffer. If the number of the pieces of data exceeds the threshold value, a polling signal is not transmitted to a next station and data stored in the buffer is transmitted to relevant stations.

Abstract: A handoff method for a mobile station in a wireless local area network, the handoff method includes outputting a handoff alert message to a present access point, receiving a response message from the present access point, the response message including channel information on access point in an extended service set, and scanning channels by using the channel information to select a new access point.

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.