Patent application number | Description | Published |
20080219230 | Method and system for authentication of WLAN terminal interworking with broadband wireless access network - A method and a system for interworking with a Broadband Wireless Access (BWA) network in a Wireless Local Area Network (WLAN) terminal. According to the method, a relay station for connecting the Wireless Local Area Network (WLAN) terminal with the Broadband Wireless Access (BWA) network sets a connection with the Broadband Wireless Access (BWA) network through an initialization process. A user authentication with the Wireless Local Area Network (WLAN) terminal is performed by the relay station in compliance with a Wireless Local Area Network (WLAN) protocol. A user authentication with a Broadband Wireless Access (BWA) network Access Control Router (ACR) is performed in compliance with a Broadband Wireless Access (BWA) network protocol by the relay station in place of the Wireless Local Area Network (WLAN) terminal. | 09-11-2008 |
20080247412 | Hybrid channel assignment method and router thereof - A hybrid channel assignment method comprising the steps of negotiating among routers to select one router to act as a central server; collecting, at the selected router, information on an entire network transmitted from the other routers, and assigning channels based upon the information on the entire network; and reassigning channels of respective routers based upon dynamically-changing traffic characteristics. The hybrid channel assignment method can assign channels using both centralized processing and distributed processing in order to ensure optimally correct channel assignment consistent with present traffic characteristics. This as a result can prevent network resources from being wasted and also increase network capacity, thereby optimizing effective use of the network resources. | 10-09-2008 |
20090028093 | METHOD FOR TRANSMITTING/RECEIVING DATA WITH TRANSFER OBLIGATION DELEGATED IN WSN - A method for transmitting/receiving data with transfer obligation delegated in a Wireless Sensor Network (WSN) reduces the time and power spent by a transmitting apparatus to wait for acknowledgment that a data transfer was successful. The method for transmitting data from a transmitting end to a receiving end through a set transfer route by multiple data transmit/receive apparatuses provided in a Wireless Sensor Network (WSN), typically includes the steps of: performing temporary storage of data to be transmitted on receiving a request to transmit data; requesting a data transmit/receive apparatus, existing on a next route, to transmit data while transmitting data to a data transmit/receive apparatus which is set as a transfer route; and confirming the delivery of the data to the data transmit/receive apparatus set as the transfer route, and then deleting the temporarily stored data frame. | 01-29-2009 |
20090029650 | METHOD AND APPARATUS FOR TRANSMITTING/RECEIVING DATA IN WIRELESS SENSOR NETWORK - A method and apparatus for transmitting/receiving data in a Wireless Sensor Network (WSN). The method typically includes the steps of: ascertaining characteristics of data whose transfer is requested; ascertaining a Link Quality Indication Value (LQIV); determining a level of a link state in consideration of the characteristics of the data and the LQIV; and controlling the link transfer of the data in consideration of the level of the link state. The apparatus includes a module for transmitting/receiving data in the network layer thereof having a link level determination unit for predefining a level of a link state, depending on characteristics of data and a Link Quality Indication Value (LQIV) to store a predefined level of the link state, and to determine a level of the link state. A link control unit controls the link transfer of the data in consideration of the determined level of the link state. | 01-29-2009 |
20090086041 | METHOD AND SYSTEM FOR CONTROLLING CAMERA THROUGH WIRELESS SENSOR NETWORK - A method for controlling a camera through a Multi-Hop-based wireless sensor network includes: sensing whether an event occurs or not in a corresponding area and transmitting position information on the corresponding area and type information on the event, converting the received position information on the event into a movement control signal for the camera, calculating camera driving values in a left/right direction and an up/down direction using the converted signal, controlling a zoom-in operation of the camera lens using the calculated camera driving values according to the received event type and photographing an object located in the corresponding direction, and transmitting the photographed images over the outer network. | 04-02-2009 |
20090089577 | MAC FRAME PROVISION METHOD AND APPARATUS CAPABLE OF ESTABLISHING SECURITY IN IEEE 802.15.4 NETWORK - A medium access control (MAC) frame provision method establishes security in an IEEE 802.15.4 network. A MAC frame is generated, which includes a MAC header, a payload field, and a frame check sequence (FCS) field, the payload field including relevant main data according to a frame type defined in the MAC header. A disguised decoy data sequence number (DSN) is generated and inserted into the MAC header. A real DSN, which is a corresponding transmission sequence number of the MAC frame, is generated and inserted into the payload field. The MAC frame is transmitted, including the encrypted payload field, to a counterpart node. A MAC ACK frame acknowledges reception of the transmitted MAC frame; and a DSN is compared in the received MAC ACK frame with the real DSN. An authentication of the counterpart node is performed when the received MAC ACK frame is equal to the real DSN. | 04-02-2009 |
20090092112 | WIRELESS SENSOR NETWORK SYSTEM AND CLUSTER MANAGEMENT METHOD THEREOF - A wireless sensor network system and a cluster management method thereof. The wireless sensor network system includes at least one cluster having at least one sensor node for collecting sensing data, and a cluster head for aggregating the sensing data from the at least one sensor node. A sink node collects the aggregated sensing data from the at least one cluster, wherein the cluster head of a first cluster determines a cluster size of the first cluster, and when the first cluster is a master cluster and the cluster size of the first cluster is less than a threshold size, merges, the first cluster into a second master cluster, and switches the first cluster to a slave cluster. In each cluster, management efficiency can thereby be maintained within a specified range, and the lifetime of a wireless sensor network can be prolonged by reducing energy consumption. | 04-09-2009 |
20090122747 | METHOD FOR TRANSMITTING DATA IN A RELAY SYSTEM AND SYSTEM THEREFOR - A method and system for transmitting data from a base station to a mobile station in a wireless communication system using a multiple hop relay scheme is In a multi-hop system having a plurality of nodes, performing bidirectional data transmission between the nodes comprises: grouping the plurality of nodes into a first node group to a fourth node group, and assigning data transmission intervals to the grouped node groups at each frame, the data transmission intervals dividing each frame in time; receiving, by a second group node, data from an upper group node at a first frame and, at the same time, receiving, by a third group node, data from a lower group node; and transmitting by the second group node data to the upper group node at a second frame and, at the same time, transmitting by the third group node data to the lower group node. | 05-14-2009 |
20090128298 | METHOD AND SYSTEM FOR LOCATING SENSOR NODE IN SENSOR NETWORK USING TRANSMIT POWER CONTROL - A method and apparatus for a sensor network having a plurality of reference nodes and a sensor node that enables the sensor node to compute a relative position through transmission range control and position mapping. In transmission range control, each reference node sends location information signals to the sensor node while varying transmission power. In position mapping, the sensor node forms a grid of vertical and horizontal lines corresponding to a square area defined by the neighboring reference nodes, extracts coordinates of intersections in the grid belonging to a shared region between areas covered by location information signals of various transmit power levels from the neighboring reference nodes, and sets the position of the sensor node to the middle points of the extracted coordinates. Each reference node sends a location information signal when a random backoff time expires after reception of a location information request signal. | 05-21-2009 |
20090128412 | METHOD AND SYSTEM FOR LOCATING SENSOR NODE IN SENSOR NETWORK USING DISTANCE DETERMINING ALGORITHM - For a sensor network having reference nodes and sensor nodes, A method and apparatus using a distance determining algorithm for a sensor network having reference nodes and sensor nodes. A distance determining algorithm is executed to determine an adequate distance between reference nodes within a preset error range, and a position location table is created. A sensor node sends a location information request to reference nodes, receives the position location table and location information from the reference nodes, and computes the coordinates of its position. Alternatively, without requesting transmission of the position location table, the sensor node may receive calculated coordinates of its position directly from a reference node. | 05-21-2009 |
20090133122 | METHOD AND SYSTEM FOR DETECTING SUSPICIOUS FRAME IN WIRELESS SENSOR NETWORK - A method and system for detecting a suspicious frame in a wireless sensor network that includes: a plurality of sensor nodes, for sending sensed data and data regarding an upper-level node and cluster head node. A data collecting node receives data from the sensor nodes, sends information, and extracts data received from the sensor nodes. A first probability of occurrence of the routing path is computed with respect to training frames, and a second probability of occurrence of a source routing path is computed using the first probability. The second probability is compared with a reference value, and displays an indication notifying an abnormality of the source node according to when the second probability and the reference value. | 05-21-2009 |
20090135764 | ROUTING METHOD AND SYSTEM FOR MOBILE AD-HOC NETWORK - A routing method and system for a mobile ad-hoc network is provided for efficiently routing a packet by quickly updating topology information shared by nodes adaptively to variation of the network topology while minimizing generation of redundant traffic. The routing method includes setting, at each current node, a self-potential value to a destination node upon receiving a route recovery request; and transmitting, when a transmission packet is destined to the destination node, the packet through a route established with at least one node in a descending order of potential value. The present invention reduces the redundant traffic dramatically, thereby improving the entire network throughput. | 05-28-2009 |
20090154437 | WIRELESS SENSOR NETWORK AND METHOD FOR PERFORMING COMMUNICATION THEREIN - A method for performing communication in the wireless sensor network is disclosed. The upper node transmits a beacon message to the lower nodes, wherein the beacon message distinguishes an indirect transmission interval, in which the upper node transmits downlink data to the plurality of lower nodes, from a direct transmission interval adjacent to the indirect transmission interval, in which the upper node receives uplink data from the plurality of lower nodes. The lower nodes determine the indirect transmission interval and the direct transmission interval from the received beacon message. The downlink data is transmitted from the upper node to the lower nodes in the indirect transmission interval. The uplink data is transmitted from the lower nodes to the upper node in the direct transmission interval. When communication is performed between the upper node and the lower nodes, the data can be efficiently transmitted from the upper node to the lower nodes. | 06-18-2009 |
20090154438 | PACKET TRANSMISSION METHOD FOR WIRELESS PERSONAL AREA NETWORK - A packet transmission method for a WPAN that for alleviating traffic concentration in an active period and improving network throughput by controlling packet transmission timing in the active period. A packet transmission method for a wireless personal area network including a coordinator operating with a specific duty cycle and a plurality of devices includes determining, when a packet is generated, whether there is another packet waiting to be sent; determining, if there is no other packet waiting to be sent, whether the network is in an inactive period; setting, when network is in an inactive period, a backoff time; and sending the packet when the backoff time has expired. The packet transmission method controls an initial backoff value adaptively to a duty cycle of the network. | 06-18-2009 |
20090180452 | COMMUNICATION TERMINAL AND METHOD FOR WIRELESS SENSOR NETWORK - A communication terminal and method is provided for improving channel utilization efficiency in a wireless sensor network using contention-based channel access mechanism is disclosed. The communication method according to the present invention comprises initializing, when a packet transmission is required, a contention window to a size; resetting, when a channel is assessed to be busy, the size of the contention window in a hybrid expansion mode; and attempting, when the channel is assessed to be idle, the packet transmission through the channel. | 07-16-2009 |
20090185538 | MOBILITY MANAGEMENT SYSTEM AND METHOD FOR INTERNET PROTOCOL BASED LOW POWER WIRELESS NETWORK - A mobility management system and method is provided for efficiently support mobility to an IPv6 based LoWpan. The mobility management method for Internet Protocol version 6 (IPv6) based personal area network (PAN) moving with a mobile router according to the present invention includes detecting, at a mobile terminal, movement of the mobile router; determining whether the movement is an intra-network movement or an inter-network movement, transmitting, when the movement is an intra-network movement, a neighbor discovery request message to a gateway of a currently attached network and receiving a neighbor discovery response message containing a temporary address transmitted by the gateway in response to the neighbor discovery request message. When the movement is an inter-network movement, the gateway receives the binding acknowledgement message from a home agent and establishes a bidirectional tunnel with the home agent. | 07-23-2009 |
20090185549 | MOBILITY HEADER COMPRESSION METHOD AND SYSTEM FOR INTERNET PROTOCOL-BASED LOW POWER WIRELESS NETWORK - A mobility header compression method and system for an IPv6-based LoWPAN is provided for supporting IPv6 mobility to the IPv6-based LoWPAN checks a packet carrying data and a first and a second headers containing transmission information about the data to determine whether the second header contains a compressed Internet Protocol version 6 (IPv6) information. When the second header contains a compressed IPv6 information, ands followed by a mobility header, a mobility support-indicative field of the first header is set to indicate that the second header is followed by the mobility header and the rest of the fields of the second header are compressed except for the mobility header-indicative field. A mobility information-indicative field of the mobility header is set to indicate inclusion of mobility information; and the rest of the fields of the mobility header are compressed except for the mobility information-indicative field. | 07-23-2009 |
20090207747 | Network device and data transmission method thereof in wireless sensor network - A wireless sensor network and data transmission method thereof provides for improving channel access efficiency and energy saving effect by using inventive carrier sensing mechanism. The data transmission method includes assessing a channel after initializing, when a packet to be transmitted is generated, a number of carrier sensing attempts (Ns) and a backoff value (W); determining, when the channel availability is assessed to be idle, whether W reaches 0; transmitting the packet if W reaches 0; and reassessing, if W does not reach 0, the channel after a duration corresponding W/(Ns-1) slot. | 08-20-2009 |
20090207748 | COMMUNICATION METHOD AND APPARATUS USING RECEIVED SIGNAL STRENGTH INDICATOR IN WIRELESS SENSOR NETWORK - A communication method and apparatus is disclosed that uses a received signal strength indicator (RSSI). In a sensor network including a plurality of nodes, a first node of the plurality of nodes receives a signal transmitted from a second node of the plurality of nodes, at least once. The first node also manages a link state with the second node according to the RSSI of the received signal. Therefore, the first node can receive signals from the plurality of nodes and then predict whether the second node moves. The first node can also predict a link state after the second node is moved so that communication can be performed through a link in a good state. Accordingly, the communication quality and the network performance of a network are enhanced. | 08-20-2009 |
20090207783 | COMMUNICATION METHOD AND APPARATUS USING VIRTUAL SINK NODE IN WIRELESS SENSOR NETWORK - A communication method and apparatus using a virtual sink node in a wireless sensor network, in which location information about a destination node is acquired by a source node. If the location of the destination node is out of a transmission range of the source node, data including the location information about the destination node are transmitted from the source node to one of nodes adjacent to the source node, where the one node is typically closest to the destination node. The data are transmitted from the one node to another one of nodes adjacent to the one node, where another node is closest to the destination node, until the destination node is located within a transmission range of the one node. If the destination node is located within the transmission range of the one node, the data are transmitted from the one node to the destination node. | 08-20-2009 |
20090300354 | METHOD AND APPARATUS FOR PREVENTING REPLAY ATTACK IN WIRELESS NETWORK ENVIRONMENT - A method for preventing a replay attack is provided. A prime number is mutually exchanged between a main node and children nodes. The main node generates a Prime Sequence Code Matrix (PSCM) corresponding to the prime number, notifies the children nodes of sequence orders corresponding to the children nodes. The main node selects an arbitrary value of a Prime Sequence Code-1 (PSC1) among a series of values corresponding to an arbitrary node in the PSCM. The arbitrary node computes a Prime Sequence Code-2 (PSC2) subsequent to receiving the PSC1 using a sequence order received from the main node and the prime number. The PSC2 is transmitted to the main node. The main node compares the received PSC2 with the PSCM. The method can be easily applied by supplementing a weakness for a replay attack on the basis of an IEEE 802.15-4-2006 standard and minimizing system load. | 12-03-2009 |
20100026686 | METHOD, APPARATUS AND SYSTEM FOR DISPLAYING TOPOLOGY INFORMATION OF WIRELESS SENSOR NETWORK - A method, apparatus and system for displaying topology information of a wireless sensor network includes a plurality of sensor nodes. The method typically includes: receiving node information collected and extracted from the sensor nodes; comparing the received node information with stored node information; computing, when the received node information is unequal to the stored node information, visualization information on a sensor node whose information is not present in the stored node information; and displaying the sensor nodes on concentric circles using the visualization information. | 02-04-2010 |
20100088510 | APPARATUS AND METHOD FOR DATA PACKET SECURITY IN A WIRELESS SENSOR NETWORK - An apparatus and method for providing data packet security in a wireless sensor network including a plurality of sensor nodes. The apparatus includes a memory unit for storing a plurality of node characteristic information and a plurality of settable security status information, each of the node characteristic information corresponding to at least one of the settable security status information; and a control unit for examining the node characteristic information of the control unit, if a data packet generation request is made, detecting the security status information corresponding to the examined node characteristic information from the memory unit, and generating data packets including the detected security status information. | 04-08-2010 |
20100115130 | TIME SLOT ALLOCATION METHOD FOR REDUCING CONSUMPTION OF ENERGY IN WIRELESS SENSOR NETWORK - Disclosed is a time slot allocation method for reducing consumption of energy in a wireless sensor network, including transmitting and receiving, by an upper node, a report request and a response to and from at least one lower node in order to identify whether there is data to be transmitted between the upper node and the at least one lower node, transmitting, by the upper node, information required for data transmission to the at least one lower node based on the report request and response, and transmitting and receiving, by the upper node, data to and from the at least one lower node based on the information required for data transmission. | 05-06-2010 |
20100118786 | METHOD AND APPARATUS FOR COLLABORATIVE SENSING BASED ON AN ALLOWED ERROR RANGE OF A SENSOR IN A WIRELESS SENSOR NODE - A method and an apparatus for transmitting sensor data by using AER sensing and collaborative sensing in order to increase the energy efficiency in a wireless sensor network. The method includes calculating an AER for each of said at least one sensor using sensor data measured from said at least one sensor and sensor profile information corresponding to said at least one sensor, and determining sensor data to be transmitted to a higher node from among sensor data provided by the sensor module based on the AER. | 05-13-2010 |
20100118812 | METHOD OF ALLOCATING LOGICAL CHANNELS IN WIRELESS SENSOR NETWORK - A method of allocating logical channels in consideration of an interference range in a wireless sensor network includes defining logical channels to increase the number of available channels and determining the number of logical channels in accordance with the number of nodes within an interference range, allocating the logical channels to the nodes within the interference range so that the determined logical channels do not overlap each other, and exchanging data among the nodes using the allocated logical channels. | 05-13-2010 |
20100124209 | METHOD FOR POWER CONSUMPTION IN WIRELESS SENSOR NETWORK - A method for reducing power consumption in a wireless sensor network is provided. An optimized path destined for a sink node is set using a common channel in which first and second nodes use a CSMA scheme. A first channel is set and transmission/reception slots for packet transmission/reception arc allocated in the first channel. A packet is transmitted to the second node through a first transmission slot using a TDMA scheme. When a packet is not received from the second node through a first reception slot within a first set amount of time, the first reception slot is allowed to transition to an inactive state. The first node is one of the sink node, at least one parent node, and at least one child node of the parent node, and the second node is one of child nodes of the first node. | 05-20-2010 |
20100128624 | METHOD OF MANAGING ALLOCATED ADDRESS IN LOW POWER WIRELESS PERSONAL AREA NETWORK - Disclosed is a method of managing an allocated address through a coordinator in a Low Power Wireless Personal Area Network (LoWPAN) including receiving a first beacon data request message from a mobile node that has entered into a communication region of the coordinator; measuring a Link Quality Indication (LQI) of the first beacon data request message, setting the measured LQI as a minimum communication threshold value with the mobile node, and setting an alarm region that is an LQI range for sensing whether the mobile node leaves the communication region; if a second beacon data request message is received from the mobile node, measuring an LQI of the second beacon data request message, and checking whether the measured LQI of the second beacon data request message is included in the alarm region; and if the LQI is included in the alarm region, periodically transmitting a node alive check message to the mobile node. | 05-27-2010 |
20100157975 | METHOD AND SYSTEM FOR PERFORMING TIME SYNCHRONIZATION BETWEEN NODES IN WIRELESS COMMUNICATION SYSTEM - A method is provided for synchronizing time between nodes in a wireless communication system. A reference node transmits a first packet to a correspondent node. Upon receiving the first packet, the correspondent node transmits a second packet with a reception time of the first packet recorded therein, to the reference node. Upon receiving the second packet, the reference node calculates a forward delay time using a transmission time and the reception time of the first packet. The correspondent node receives a third packet with the forward delay time from the reference node, and calculates a reverse delay time. The correspondent node calculates an offset value for the synchronization using the forward delay time and the reverse delay time. | 06-24-2010 |