Samsung Electronics Co., Ltd.

Jin-Hyun Sin

Song-Yean Cho

Byung-Soo Kim

Hyeong-Seok Kim

Byung-in Mun

Hyuck Yoo

Yeon-Shik Shin

See-hwan Yoo

Jin-hee Choi

Hyeong-seok Kim

Ji-young Kong

Hye-young Jung

Byung-In Mun

See-Hwan Yoo

An application service providing system including: a service server for managing a plurality of applications, determining suitability of a client when a service is provided, and providing an application requested by the client; the client for performing communication with the service server through a wireless network, defining a device identifier in an operating system, and requesting the service server to provide an application service through a profile corresponding to the device identifier; and at least one terminal displaying the application in response to a request by the client.

Method and apparatus for providing application service, and system for providing the same

A wireless networking device and a communication method using the same. The wireless networking device includes an address generator to generate an address to be used in a predetermined wireless network, a router information setter to set router information of the wireless network, and a controller to control operation of the address generator and the router information setter according to the router information and perform hand-off to a wireless network that corresponds to the router information.

Wireless networking device and communication method using the same

Disclosed is a method of implementing a multicast routing system in a mobile ad-hoc network environment. The method includes causing control packets for data transmission to be transmitted from a source node to object nodes in accordance with a predetermined method when data to be transmitted from the source node to the object nodes exists, forming, in a tree structure, information concerning nodes on paths through which the control packets are transmitted, and causing the source node to transmit the data to the object nodes using the formed tree structure.

Method of implementing multicast routing system in mobile ad-hoc network environment

A system for reliably broadcasting a data packet under an ad-hoc network environment including a determining unit for determining whether or not at least one node receiving the broadcast data packet is a relay node, a comparing unit for comparing a first relay node sequence number contained in a management packet which the node transmits with a second relay node sequence number stored in a neighbor table of the node, and a control unit for determining whether or not the data packet is retransmitted to the node according to a result of the comparison of the comparing unit. By comparing the second relay node sequence number stored in the neighbor table of the node which has broadcast the data packet with the first relay node sequence numbers transmitted through a Hello packet, it is possible to check whether or not the data packet is lost during broadcasting, and thus it is possible to reduce a loss factor of the data packet which is generated during broadcasting. Thereby, the data packet can be reliably broadcast.

System and method of reliably broadcasting data packet under ad-hoc network environment

Provided are a method for transmitting data in a mobile ad hoc network in which the quantity of data transmitted is adjusted by adjusting the size of a congestion window when network duplicate ACK packets are received, and a network apparatus using the same. The method includes mapping sequence numbers of data packets to be transmitted to congestion window sizes during transmission of the data packets, determining whether there is a lost data packet or not, and if there is a lost data packet, retransmitting the lost data packet and adjusting a congestion window size to the congestion window size mapped to the sequence number of the lost data packet. Accordingly, a data rate throughput over a wireless ad hoc network can be increased.

Method for transmitting data in mobile ad hoc network and network apparatus using the same

A method of efficiently transmitting/receiving data using a transport layer in a mobile ad hoc network, and a network device using the method. The method includes a first step of setting, by a sending host, a flag for requesting an ACK-response into a predetermined packet of packets contained in a window for data transmission; a second step of sending, by the sending host, the packet with the flag set thereinto and other packets without any flags contained in the window to a receiving host; and a third step of, by the receiving host, receiving the packets transmitted in the second step, and sending the ACK-response to the packet with the flag set thereinto among the received packets.

Method of efficiently transmitting/receiving data using transport layer in a mobile ad hoc network, and network device using the method

A method for adjusting a transmission rate in the transmission control protocol (TCP) under a mobile ad hoc network environment, including calculating a difference value (Diff) between the current transmission rate (cur_bw) and the previous transmission rate (base_bw), setting up upper and lower thresholds by calculating the standard variation (basebw_var) of the previous transmission rate, and updating the previous transmission rate to the current transmission rate depending upon a comparison result of Diff and the size of the upper and lower thresholds.

Method for adjusting a transmission rate to obtain the optimum transmission rate in a mobile ad hoc network environment

A method and an apparatus for requesting packet redelivery in a mobile ad hoc network environment. The method includes receiving a first packet periodically broadcasted, extracting packet delivery information of a second packet from the first packet, the second packet including data generated by an application program, determining loss of the second packet based on the packet delivery information, and broadcasting a request packet to request redelivery of the second packet, when it is determined that the second packet is lost.

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Seoul, South Korea

Jin-Hyun Sin