摘要:
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.
摘要:
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.
摘要:
Provided are a sensor node included in a sensor network, an update server updating the sensor node, and a method of updating a sensor node. The update server updating a sensor node included in a sensor network includes an execution code manager managing execution codes for a plurality of sensor nodes included in the sensor network, a rule generator generating an update rule based on a result of comparing an existing execution code managed by the execution code manager with an update execution code required for a new function update of the sensor node, and a downloader causing the sensor node to download the update rule generated by the rule generator. Accordingly, an execution code can be updated by a small amount of data transmission.
摘要:
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.
摘要:
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.
摘要:
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.
摘要:
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.
摘要:
There is provided a matching system for preventing the loss of data between a low-power network and a non-low-power network, the matching system including: an RF communication schedule management unit, installed in the low-power network side system, for managing a schedule of an RF communication period indicative of a data transmission period of the low-power network; a heterogeneous network communication schedule management unit, disposed in the non-low-power network side system, for creating a schedule to transmit data to the low-power network side system based on the RF communication period provided by the RF communication schedule management unit; and a heterogeneous network communication unit for transmitting the data to the low-power network side system depending on the schedule created by the heterogeneous network communication schedule management unit.
摘要:
Provided is a method for transmitting sensing information in a wireless sensor network including a pair node. The method for transmitting sensing information in a wireless sensor network including a sink node, parent nodes, and sensor nodes set as pair nodes among sensor nodes connected to the parent nodes, includes the steps of: a) setting up predetermined sensor nodes in the same target area as pair nodes for transmitting and receiving sensing information to/from corresponding sensor nodes; b) at the pair nodes, transmitting first sensing information sensed by oneself to corresponding sensor nodes; c) at the sensor nodes, transmitting first sensing information sensed by oneself and second sensing information transmitted from corresponding pair nodes to the parent node; and d) at the parent node, transmitting the received first and second sensing information to the sink node at the same time.
摘要:
Provided is a method of minimizing power consumed by each node in a wireless network when communicating with neighboring nodes.Unlike a conventional synchronous media access control (MAC), the present invention suggests an asynchronous MAC. Thus, the active duration of a node extends only when transmitting a large quantity of data and the extended active duration returns to the minimum active duration again after completing the data transmission.