Ajou University Industry-academic Cooperation Foundation

Electronics and Telecommunications Research Institute

Ajou University Industry Cooperation Foundation

Samsung Electronics Co., Ltd.

Daewoo Educational Foundation

Ajoo University Industry Cooperation Foundation

Young Bae Ko

Sang Joon Park

Jai Hoon Kim

Jong Mu Choi

Sung Hee Lee

Jae Bum Kim

Jae Hoon Kim

Byoung Joon Lee

Myeong Wuk Jang

Sung Won Lee

Chang Joo Kim

Kyung Yul Cheon

Yoo Seung Song

Seung Mok Yoo

Sung Hwa Lim

Young Bag Moon

Keun Woo Lim

Woo Sung Jung

Ji Na Han

Gue Hwan Jung

Daewook Shin

Jae Beom Kim

A node device using a TV white space (TVWS) includes a decision unit for comparing energy levels of a first sub-channel and at least one second sub-channel adjacent to the first sub-channel among a plurality of sub-channels with respect to a digital TV (DTV) channel including the plurality of sub-channels and deciding whether the DTV channel is an available channel, and a discovery unit for, if the DTV channel is decided as the available channel, discovering a beacon by scanning the first sub-channel in the DTV channel.

Node device, network system, and method for discovering neighbor of node device in TVWS communication environment

A method of caching a content in a node in a content-centric network, includes receiving, from a content requester, a content request packet requesting a first chunk of the content, and setting a mark bit indicating whether the node is to cache the first chunk when the first chunk is received. The method further includes receiving, from a content provider, a data packet including the first chunk in response to transmitting the content request packet to the content provider, and caching the first chunk.

Method of caching contents by node and method of transmitting contents by contents provider in a content centric network

In a method for communicating among a plurality of nodes in a content-centric networking environment, each of a plurality of nodes selects at least one relay node based on topology information on neighbor nodes adjacent within 2 hops from itself. Each of the selected relay nodes determines whether itself is a publisher relay node. Each of the determined publisher relay nodes generates a multi-hop content announce (CA) message including content information of its own 1-hop neighbor nodes, and broadcasts the multi-hop CA message to the plurality of nodes through the selected relay nodes.

Node and a method of communicating among a plurality of nodes in content-centric networking environment

The present invention provides a method and system for performing distributed channel sensing in which channel information is collected by performing channel sensing according to a channel sensing priority which is determined according to a relative position of a cell to which a wireless connection device belongs from among a plurality of cells which logically partition the zone of the wireless network, and thus the overhead of the channel sensing which is generated in a cognitive wireless multi-hop network environment is reduced, and the transmission failure which occurs when the wireless connection device detects frequencies is reduced.

Method and system of distributed sensing for reducing spectrum sensing overhead in cognitive wireless multi-hop networks

A location-based content-centric networking method for location-based content is provided. The location-based content-centric networking method may include: naming location-based content in such a manner that the name given to the location-based content includes a hierarchical prefix corresponding to information contained in the location-based content; and forwarding the location-based content based on prefix information of the location-based content.

Location-based content-centric networking method

Provided is a multi-route routing scheme that supports Quality of Service (QoS) in the wireless mesh network. A method of notifying about and avoiding congestion situation in data transmission in a wireless mesh network and a mesh node may also be provided. Data may be differentially transmitted to multiple routes by obtaining a route congestion level existing in a current multi-hop route and thus, data providing a real-time service, such as a video streaming service, may avoid congested routes and may be promptly transmitted. Multiple queues in a mesh node may be divided into divided queues based on a congestion situation of a transmission route in a network and the divided queues may be transmitted through multiple routes and thus, an efficiency of the overall network may increase.

Method for notifying about/avoiding congestion situation of data transmission in wireless mesh network, and mesh node for the same

Provided are a sensor network structure, a data aggregation method, and a clustering method for efficient multi-target tracking. The multi-target tracking may be efficiently performed in a heterogeneous sensor network by combining clustering methods and adaptively varying the clustering methods. As such, an energy consumption problem in a sensor network may be reduced, and a data transmission delay problem or a data traffic problem may be solved by reducing the amount of data to be transmitted.

Hybrid clustering based data aggregation method for multi-target tracking in wireless sensor network

A method for effectively using power resource in a wireless mesh network is disclosed to select and change a level of a power saving mode according to terminal and network situations to increase the duration of the network's existence as well as improve the power consumption of each mesh terminal. After active mesh terminals that are to perform a data relay function and super-saving mesh terminals that are not to perform the data relay function are selected in consideration of a network topology at certain periods, the level of a power saving mode of the mesh terminals selected as the super-saving mesh terminals is higher than that of the mesh terminals selected as the active mesh terminals. And then, a routing path in a tree form is formed along the mesh terminals selected as the active mesh terminals to transmit data.

Method for improving energy efficiency in wireless mesh network

The present invention relates to a directional flooding method in a wireless sensor network. Transfer of a packet between respective sensor nodes and a sink node in a wireless sensor network is made with the directivity. To this end, when the packet is transmitted from the sensor nodes to the sink node, only the sensor nodes having a minimum hop count for the sink node are involved in transmission of the packet. Meanwhile, if the packet is sent from the sink node to the sensor nodes within a given destination area, after the packet reaches a corresponding destination area, only sensor nodes located within the destination area transmit the packet. The present invention has an effect that it can improve energy consumed on average and a total number of packets transmitted when transmitting the packets in a wireless sensor network compared to a conventional simple flooding method.

Directional flooding method in wireless sensor network

A method for enhanced power saving on DCF based wireless networks is disclosed. The method divides a beacon transmitting section in an Announcement Traffic Indication Message (hereinafter, referred to as 'ATIM') window period defined by IEEE standard 802.11 according as there is a data packet to be sent or not and allows a terminal that has received the beacon to go to a doze state immediately according to beacon reception timing, thereby preventing unnecessary power consumption.

Method for enhanced power saving on DCF based wireless networks

A method for power saving routing in wireless networks is disclosed. The present invention calculates a distance to a destination node to select and estimate candidate nodes so as to reduce the amount of calculations in the event of routing. Furthermore, the invention repeats the algorithm by optimum value n so that accessibility to the destination node can be obtained. This enables more efficient routing.

Growing community of inventors

Gyeonggi-do, South Korea

Young Bae Ko