Patent application number | Description | Published |
20090122733 | Coordinator in wireless sensor network and method of operating the coordinator - Provided are a coordinator in a wireless sensor network (WSN) which can improve transmission performance and prevent data loss, and a method of operating the coordinator. The method includes: scanning a transmitted beacon and storing information on a channel included in the beacon; when it is determined that a home channel communicating with a parent node is in an inactive mode on the basis of the information on the channel, in synchronization with the activation of another channel of the same hierarchical level as that of the home channel, activating a home channel communicating with a child node and communicating with the child node; and communicating with the child node through an auxiliary channel that has a frequency band different from those of the home channel communicating with the child node and home channels of other nodes and is always in an active mode. | 05-14-2009 |
20090141741 | METHOD AND APPARATUS FOR CONNECTING SENSOR NETWORK TO HETEROGENEOUS NETWORK - Provided are a method and apparatus for connecting a sensor network to a heterogeneous network, in which an external network connected to the sensor network functions as a virtual personal area network (PAN) so that the same PAN address system is used between the sensor network and the external network by using a concept of a ‘virtual PAN’. According to the method and apparatus for connecting the sensor network to the heterogeneous network, a node of the sensor network can efficiently communicate with a node of the external network including the heterogeneous network by assigning the virtual PAN address to the node of the external network including the heterogeneous network without inserting any additional layer into the node of the sensor network. | 06-04-2009 |
20090147699 | METHOD OF SUPPORTING NODE PORTABILITY IN SENSOR NETWORK - Provided is a method of supporting node portability in a sensor network, wherein data transmission to a portable node can be guaranteed since even when the portable node is assigned with a different address by being associated with another network, the newly assigned address is transmitted to a parent node or a sink node that was previously associated with the portable node. | 06-11-2009 |
20090147715 | ENERGY SAVING METHOD IN WIRELESS NETWORK - Provided is a method of minimizing power consumed by each node in a wireless network when communicating with neighboring nodes. | 06-11-2009 |
20090161637 | COMMUNICATION APPARATUS AND METHOD IN WIRELESS SENSOR NETWORK - Provided are a communication method and apparatus of a wireless sensor network which uses at least one channel and has a tree structure. The method includes: generating windows, where a beacon interval is divided, according to each channel; selecting a window, which is not assigned to nodes that exist within a predetermined range from a certain node, from among the generated windows; and the certain node communicating with a child node of the certain node by using a channel to which the selected window belongs during a time corresponding to the selected window. | 06-25-2009 |
20100034159 | SENSOR NETWORK MEDIUM ACCESS CONTROL (MAC) SYSTEM FOR MULTIHOP COMMUNICATION - A medium access control (MAC) technique of a multihop sensor network. In the multihop sensor network, the MAC technique may contribute to significantly reducing transmission delay, and allow real-time services to be provided to all nodes by extending a guaranteed time slot (GTS) restricted to one hop in a personal area network (PAN) coordinator (PNC) to all nodes. Furthermore, the MAC technique may allow the number of available GTSs to be significantly increased, by using all 16 frequency band channels instead of using only a single frequency band and setting a multi-superframe. | 02-11-2010 |
Patent application number | Description | Published |
20110134818 | LOW-POWER METHOD FOR MEDIA ACCESS CONTROL IN SEMI-LINEAR SENSOR NETWORK - A low-power method for media access control on a semi-linear sensor network with multiple sensor nodes, includes: sensing a channel after waking up from a sleep mode by an arbitrary transmission sensor node that has obtained data; and generating a long preamble including a number of element preambles and sending to a destination sensor node after said channel sensing. This method further includes: sending said data to said destination sensor node after completion of transmission of said long preamble; and identifying duty cycle information of said destination sensor node after completion of transmission of said data and adjusting the number of said element preambles according to said duty cycle information. | 06-09-2011 |
20110140851 | WAKEUP-ON-DEMAND APPARATUS AND MEHTOD, SENSOR DEVICE USING THE SAME, AND WAKEUP-ON-DEMAND METHOD OF SENSOR DEVICE - A wakeup-on-demand apparatus includes: a wakeup radio receiver (WRR) receiving a first radio signal to detect an address; and a main radio transceiver (MRT) responding to the first radio signal, transmitting and receiving a second radio signal for data communication, when the detected address coincides with a preset address. | 06-16-2011 |
20120146812 | SYSTEM AND METHOD FOR DISSEMINATING CAR ACCIDENT - Provided is a system and method for disseminating an accident. The accident dissemination system may include a sensor to sense the accident and to generate accident information; and a vehicle processor to open an S channel and thereby transmit the accident information to a vehicle at the rear entering an accident location where the accident has occurred, and to transmit the accident information to an oncoming vehicle, travelling in the opposite direction and being alienated from the accident location, via a first D channel opened by the oncoming vehicle. | 06-14-2012 |