Abstract:
PURPOSE: An AP(Access Point) selecting device and a method thereof are provided to minimize additional delay in the selection of an AP in a wireless communication network environment. CONSTITUTION: A scanning unit(110) receives a beacon message from a plurality of APs. An AP extracting unit(120) extracts an AP complying with a set extraction condition based on beacon information included in the beacon message. An AP selecting unit(160) selects the AP connecting to the AP complying with the selection condition set in the extracted APs. When the extracted condition is complied with extracted reference information, the AP does not execute a security procedure. [Reference numerals] (110) Scanning unit; (120) Access point extraction unit; (130) Extraction reference storage unit; (140) List generation unit; (150) List providing unit; (160) Access point selecting unit
Abstract:
PURPOSE: A control method of a wireless sensor network is provided to store data in a network level by restricting the transmission of an unnecessary message based on the location information of a sensor node in the wireless sensor network. CONSTITUTION: The location information of a caching node(220) is included in an introduction list message. The introduction list message is distributed to a sensor node(210). The sensor node generates sensing data corresponding to a synchronization node. The sensor node transmits the generated sensing data to a caching node corresponding to the location information of the caching node. The caching node returns the sensing data when a data request is received from the synchronization node generating the introduction list message. [Reference numerals] (AA) Wireless sensor network
Abstract:
A transmission power decision method according to network topology configuration based on angular information and a system thereof and a recording medium thereof are provided to continuously maintain information about neighbor nodes that each node has, thereby selectively using another link whenever wireless link connection is failed. The entire network is separated into sectors(510). A database about neighbor node sets included in the separated sectors is configured. The configured database is stored in its own node(520). A neighbor node for a minimum spanning tree is determined to configure a minimum spanning tree(530). Transmission power is determined according to a distance to the neighbor node for a minimum spanning tree(540).
Abstract:
A method for generating and transmitting/receiving location-based data frames by using location information and a system therefor are provided to enable each node within a network to classify data transmission/reception regionally by using the location information of a transmitting/receiving node, and control the number of nodes which can access a transmission medium at once. A position measurement part(230) measures the current location through a position measurement technology. A routing table(220) stores the location information of each node or the corresponding location address information. A location-based data frame generating module(240) confirms the location information of a source node or destination node by using the position measurement part, the direct input by a user or location information stored in the routing table, sets up the location address of the source node or destination node by using the confirmed location information, and then generates a location-based data frame including the set location address.
Abstract:
A wireless network system and a resource sharing method thereof are provided to allocate network resources to each node according to a degree of contributing to network traffic by using a resource sharing protocol, so that resource sharing can be smoothly performed. If network traffic of neighboring nodes is relayed or resources are provided from the neighboring nodes, credit information corresponding to an amount of the provided resources is generated or reward information corresponding to the resources is generated(S10,S20). The credit information or the reward information is broadcasted through digital signature(S30). Credit information and reward information digitally signed from other neighboring nodes are received to decide whether the credit information is valid(S40,S50). If so, network resources are calculated as much as the credit information(S60).
Abstract:
본 발명에 따른 위치 추적 장치는 기설치된 센서를 통해 최대 가속도값 및 상기 최대 가속도값이 발생할 때의 방향값을 센싱하는 센서부, 상기 최대 가속도값 및 방향값에 의하여 특정되는 가속도 벡터를 지표면 좌표축을 기준으로 변환하여 이동 방향을 생성하는 이동 방향 생성부, 이동 방향을 기준으로 설정된 탐색 각도 내에 위치한 와이파이 AP를 탐색하는 AP 탐색부, 상기 와이파이 AP의 개수 및 종류에 따라 WCA(Weighted Centroid Algorithm) 또는 변형된 WCA를 선택적으로 수행하여 상기 위치 추적 장치의 현재 위치를 측정하는 위치 측정부를 포함하되, 상기 AP 탐색부는 탐색된 와이파이 AP의 개수가 임계값 미만인 경우, 가장 강한 신호세기를 갖는 AP와 미탐색된 AP를 선정하고, 상기 변형된 WCA는 AP의 개수가 임계값 미만인 경우 선정된 상기 AP를 바탕으로 WCA를 수행하는 것이다.